sys/dev/aic7xxx/aic7xxx.c

   1 /*-
   2  * Core routines and tables shareable across OS platforms.
   3  *
   4  * Copyright (c) 1994-2002 Justin T. Gibbs.
   5  * Copyright (c) 2000-2002 Adaptec Inc.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions, and the following disclaimer,
  13  *    without modification.
  14  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  15  *    substantially similar to the "NO WARRANTY" disclaimer below
  16  *    ("Disclaimer") and any redistribution must be conditioned upon
  17  *    including a substantially similar Disclaimer requirement for further
  18  *    binary redistribution.
  19  * 3. Neither the names of the above-listed copyright holders nor the names
  20  *    of any contributors may be used to endorse or promote products derived
  21  *    from this software without specific prior written permission.
  22  *
  23  * Alternatively, this software may be distributed under the terms of the
  24  * GNU General Public License ("GPL") version 2 as published by the Free
  25  * Software Foundation.
  26  *
  27  * NO WARRANTY
  28  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  29  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  30  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  31  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  32  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  36  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  37  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  38  * POSSIBILITY OF SUCH DAMAGES.
  39  *
  40  * $Id: //depot/aic7xxx/aic7xxx/aic7xxx.c#155 $
  41  */
  42
  43 #ifdef __linux__
  44 #include "aic7xxx_osm.h"
  45 #include "aic7xxx_inline.h"
  46 #include "aicasm/aicasm_insformat.h"
  47 #else
  48 #include <sys/cdefs.h>
  49 __FBSDID("$FreeBSD$");
  50 #include <dev/aic7xxx/aic7xxx_osm.h>
  51 #include <dev/aic7xxx/aic7xxx_inline.h>
  52 #include <dev/aic7xxx/aicasm/aicasm_insformat.h>
  53 #endif
  54
  55 /****************************** Softc Data ************************************/
  56 struct ahc_softc_tailq ahc_tailq = TAILQ_HEAD_INITIALIZER(ahc_tailq);
  57
  58 /***************************** Lookup Tables **********************************/
  59 char *ahc_chip_names[] =
  60 {
  61         "NONE",
  62         "aic7770",
  63         "aic7850",
  64         "aic7855",
  65         "aic7859",
  66         "aic7860",
  67         "aic7870",
  68         "aic7880",
  69         "aic7895",
  70         "aic7895C",
  71         "aic7890/91",
  72         "aic7896/97",
  73         "aic7892",
  74         "aic7899"
  75 };
  76
  77 /*
  78  * Hardware error codes.
  79  */
  80 struct ahc_hard_error_entry {
  81         uint8_t errno;
  82         char *errmesg;
  83 };
  84
  85 static struct ahc_hard_error_entry ahc_hard_errors[] = {
  86         { ILLHADDR,     "Illegal Host Access" },
  87         { ILLSADDR,     "Illegal Sequencer Address referrenced" },
  88         { ILLOPCODE,    "Illegal Opcode in sequencer program" },
  89         { SQPARERR,     "Sequencer Parity Error" },
  90         { DPARERR,      "Data-path Parity Error" },
  91         { MPARERR,      "Scratch or SCB Memory Parity Error" },
  92         { PCIERRSTAT,   "PCI Error detected" },
  93         { CIOPARERR,    "CIOBUS Parity Error" },
  94 };
  95 static const u_int num_errors = NUM_ELEMENTS(ahc_hard_errors);
  96
  97 static struct ahc_phase_table_entry ahc_phase_table[] =
  98 {
  99         { P_DATAOUT,    MSG_NOOP,               "in Data-out phase"     },
 100         { P_DATAIN,     MSG_INITIATOR_DET_ERR,  "in Data-in phase"      },
 101         { P_DATAOUT_DT, MSG_NOOP,               "in DT Data-out phase"  },
 102         { P_DATAIN_DT,  MSG_INITIATOR_DET_ERR,  "in DT Data-in phase"   },
 103         { P_COMMAND,    MSG_NOOP,               "in Command phase"      },
 104         { P_MESGOUT,    MSG_NOOP,               "in Message-out phase"  },
 105         { P_STATUS,     MSG_INITIATOR_DET_ERR,  "in Status phase"       },
 106         { P_MESGIN,     MSG_PARITY_ERROR,       "in Message-in phase"   },
 107         { P_BUSFREE,    MSG_NOOP,               "while idle"            },
 108         { 0,            MSG_NOOP,               "in unknown phase"      }
 109 };
 110
 111 /*
 112  * In most cases we only wish to itterate over real phases, so
 113  * exclude the last element from the count.
 114  */
 115 static const u_int num_phases = NUM_ELEMENTS(ahc_phase_table) - 1;
 116
 117 /*
 118  * Valid SCSIRATE values.  (p. 3-17)
 119  * Provides a mapping of transfer periods in ns to the proper value to
 120  * stick in the scsixfer reg.
 121  */
 122 static struct ahc_syncrate ahc_syncrates[] =
 123 {
 124       /* ultra2    fast/ultra  period     rate */
 125         { 0x42,      0x000,      9,      "80.0" },
 126         { 0x03,      0x000,     10,      "40.0" },
 127         { 0x04,      0x000,     11,      "33.0" },
 128         { 0x05,      0x100,     12,      "20.0" },
 129         { 0x06,      0x110,     15,      "16.0" },
 130         { 0x07,      0x120,     18,      "13.4" },
 131         { 0x08,      0x000,     25,      "10.0" },
 132         { 0x19,      0x010,     31,      "8.0"  },
 133         { 0x1a,      0x020,     37,      "6.67" },
 134         { 0x1b,      0x030,     43,      "5.7"  },
 135         { 0x1c,      0x040,     50,      "5.0"  },
 136         { 0x00,      0x050,     56,      "4.4"  },
 137         { 0x00,      0x060,     62,      "4.0"  },
 138         { 0x00,      0x070,     68,      "3.6"  },
 139         { 0x00,      0x000,      0,      NULL   }
 140 };
 141
 142 /* Our Sequencer Program */
 143 #include "aic7xxx_seq.h"
 144
 145 /**************************** Function Declarations ***************************/
 146 static void             ahc_force_renegotiation(struct ahc_softc *ahc,
 147                                                 struct ahc_devinfo *devinfo);
 148 static struct ahc_tmode_tstate*
 149                         ahc_alloc_tstate(struct ahc_softc *ahc,
 150                                          u_int scsi_id, char channel);
 151 #ifdef AHC_TARGET_MODE
 152 static void             ahc_free_tstate(struct ahc_softc *ahc,
 153                                         u_int scsi_id, char channel, int force);
 154 #endif
 155 static struct ahc_syncrate*
 156                         ahc_devlimited_syncrate(struct ahc_softc *ahc,
 157                                                 struct ahc_initiator_tinfo *,
 158                                                 u_int *period,
 159                                                 u_int *ppr_options,
 160                                                 role_t role);
 161 static void             ahc_update_pending_scbs(struct ahc_softc *ahc);
 162 static void             ahc_fetch_devinfo(struct ahc_softc *ahc,
 163                                           struct ahc_devinfo *devinfo);
 164 static void             ahc_scb_devinfo(struct ahc_softc *ahc,
 165                                         struct ahc_devinfo *devinfo,
 166                                         struct scb *scb);
 167 static void             ahc_assert_atn(struct ahc_softc *ahc);
 168 static void             ahc_setup_initiator_msgout(struct ahc_softc *ahc,
 169                                                    struct ahc_devinfo *devinfo,
 170                                                    struct scb *scb);
 171 static void             ahc_build_transfer_msg(struct ahc_softc *ahc,
 172                                                struct ahc_devinfo *devinfo);
 173 static void             ahc_construct_sdtr(struct ahc_softc *ahc,
 174                                            struct ahc_devinfo *devinfo,
 175                                            u_int period, u_int offset);
 176 static void             ahc_construct_wdtr(struct ahc_softc *ahc,
 177                                            struct ahc_devinfo *devinfo,
 178                                            u_int bus_width);
 179 static void             ahc_construct_ppr(struct ahc_softc *ahc,
 180                                           struct ahc_devinfo *devinfo,
 181                                           u_int period, u_int offset,
 182                                           u_int bus_width, u_int ppr_options);
 183 static void             ahc_clear_msg_state(struct ahc_softc *ahc);
 184 static void             ahc_handle_proto_violation(struct ahc_softc *ahc);
 185 static void             ahc_handle_message_phase(struct ahc_softc *ahc);
 186 typedef enum {
 187         AHCMSG_1B,
 188         AHCMSG_2B,
 189         AHCMSG_EXT
 190 } ahc_msgtype;
 191 static int              ahc_sent_msg(struct ahc_softc *ahc, ahc_msgtype type,
 192                                      u_int msgval, int full);
 193 static int              ahc_parse_msg(struct ahc_softc *ahc,
 194                                       struct ahc_devinfo *devinfo);
 195 static int              ahc_handle_msg_reject(struct ahc_softc *ahc,
 196                                               struct ahc_devinfo *devinfo);
 197 static void             ahc_handle_ign_wide_residue(struct ahc_softc *ahc,
 198                                                 struct ahc_devinfo *devinfo);
 199 static void             ahc_reinitialize_dataptrs(struct ahc_softc *ahc);
 200 static void             ahc_handle_devreset(struct ahc_softc *ahc,
 201                                             struct ahc_devinfo *devinfo,
 202                                             cam_status status, char *message,
 203                                             int verbose_level);
 204 #ifdef AHC_TARGET_MODE
 205 static void             ahc_setup_target_msgin(struct ahc_softc *ahc,
 206                                                struct ahc_devinfo *devinfo,
 207                                                struct scb *scb);
 208 #endif
 209
 210 static bus_dmamap_callback_t    ahc_dmamap_cb;
 211 static void                     ahc_build_free_scb_list(struct ahc_softc *ahc);
 212 static int                      ahc_init_scbdata(struct ahc_softc *ahc);
 213 static void                     ahc_fini_scbdata(struct ahc_softc *ahc);
 214 static void             ahc_qinfifo_requeue(struct ahc_softc *ahc,
 215                                             struct scb *prev_scb,
 216                                             struct scb *scb);
 217 static int              ahc_qinfifo_count(struct ahc_softc *ahc);
 218 static u_int            ahc_rem_scb_from_disc_list(struct ahc_softc *ahc,
 219                                                    u_int prev, u_int scbptr);
 220 static void             ahc_add_curscb_to_free_list(struct ahc_softc *ahc);
 221 static u_int            ahc_rem_wscb(struct ahc_softc *ahc,
 222                                      u_int scbpos, u_int prev);
 223 static void             ahc_reset_current_bus(struct ahc_softc *ahc);
 224 #ifdef AHC_DUMP_SEQ
 225 static void             ahc_dumpseq(struct ahc_softc *ahc);
 226 #endif
 227 static int              ahc_loadseq(struct ahc_softc *ahc);
 228 static int              ahc_check_patch(struct ahc_softc *ahc,
 229                                         struct patch **start_patch,
 230                                         u_int start_instr, u_int *skip_addr);
 231 static void             ahc_download_instr(struct ahc_softc *ahc,
 232                                            u_int instrptr, uint8_t *dconsts);
 233 static int              ahc_other_scb_timeout(struct ahc_softc *ahc,
 234                                               struct scb *scb,
 235                                               struct scb *other_scb);
 236 #ifdef AHC_TARGET_MODE
 237 static void             ahc_queue_lstate_event(struct ahc_softc *ahc,
 238                                                struct ahc_tmode_lstate *lstate,
 239                                                u_int initiator_id,
 240                                                u_int event_type,
 241                                                u_int event_arg);
 242 static void             ahc_update_scsiid(struct ahc_softc *ahc,
 243                                           u_int targid_mask);
 244 static int              ahc_handle_target_cmd(struct ahc_softc *ahc,
 245                                               struct target_cmd *cmd);
 246 #endif
 247 /************************* Sequencer Execution Control ************************/
 248 /*
 249  * Restart the sequencer program from address zero
 250  */
 251 void
 252 ahc_restart(struct ahc_softc *ahc)
 253 {
 254
 255         ahc_pause(ahc);
 256
 257         /* No more pending messages. */
 258         ahc_clear_msg_state(ahc);
 259
 260         ahc_outb(ahc, SCSISIGO, 0);             /* De-assert BSY */
 261         ahc_outb(ahc, MSG_OUT, MSG_NOOP);       /* No message to send */
 262         ahc_outb(ahc, SXFRCTL1, ahc_inb(ahc, SXFRCTL1) & ~BITBUCKET);
 263         ahc_outb(ahc, LASTPHASE, P_BUSFREE);
 264         ahc_outb(ahc, SAVED_SCSIID, 0xFF);
 265         ahc_outb(ahc, SAVED_LUN, 0xFF);
 266
 267         /*
 268          * Ensure that the sequencer's idea of TQINPOS
 269          * matches our own.  The sequencer increments TQINPOS
 270          * only after it sees a DMA complete and a reset could
 271          * occur before the increment leaving the kernel to believe
 272          * the command arrived but the sequencer to not.
 273          */
 274         ahc_outb(ahc, TQINPOS, ahc->tqinfifonext);
 275
 276         /* Always allow reselection */
 277         ahc_outb(ahc, SCSISEQ,
 278                  ahc_inb(ahc, SCSISEQ_TEMPLATE) & (ENSELI|ENRSELI|ENAUTOATNP));
 279         if ((ahc->features & AHC_CMD_CHAN) != 0) {
 280                 /* Ensure that no DMA operations are in progress */
 281                 ahc_outb(ahc, CCSCBCNT, 0);
 282                 ahc_outb(ahc, CCSGCTL, 0);
 283                 ahc_outb(ahc, CCSCBCTL, 0);
 284         }
 285         /*
 286          * If we were in the process of DMA'ing SCB data into
 287          * an SCB, replace that SCB on the free list.  This prevents
 288          * an SCB leak.
 289          */
 290         if ((ahc_inb(ahc, SEQ_FLAGS2) & SCB_DMA) != 0) {
 291                 ahc_add_curscb_to_free_list(ahc);
 292                 ahc_outb(ahc, SEQ_FLAGS2,
 293                          ahc_inb(ahc, SEQ_FLAGS2) & ~SCB_DMA);
 294         }
 295
 296         /*
 297          * Clear any pending sequencer interrupt.  It is no
 298          * longer relevant since we're resetting the Program
 299          * Counter.
 300          */
 301         ahc_outb(ahc, CLRINT, CLRSEQINT);
 302
 303         ahc_outb(ahc, MWI_RESIDUAL, 0);
 304         ahc_outb(ahc, SEQCTL, ahc->seqctl);
 305         ahc_outb(ahc, SEQADDR0, 0);
 306         ahc_outb(ahc, SEQADDR1, 0);
 307
 308         ahc_unpause(ahc);
 309 }
 310
 311 /************************* Input/Output Queues ********************************/
 312 void
 313 ahc_run_qoutfifo(struct ahc_softc *ahc)
 314 {
 315         struct scb *scb;
 316         u_int  scb_index;
 317
 318         ahc_sync_qoutfifo(ahc, BUS_DMASYNC_POSTREAD);
 319         while (ahc->qoutfifo[ahc->qoutfifonext] != SCB_LIST_NULL) {
 320
 321                 scb_index = ahc->qoutfifo[ahc->qoutfifonext];
 322                 if ((ahc->qoutfifonext & 0x03) == 0x03) {
 323                         u_int modnext;
 324
 325                         /*
 326                          * Clear 32bits of QOUTFIFO at a time
 327                          * so that we don't clobber an incoming
 328                          * byte DMA to the array on architectures
 329                          * that only support 32bit load and store
 330                          * operations.
 331                          */
 332                         modnext = ahc->qoutfifonext & ~0x3;
 333                         *((uint32_t *)(&ahc->qoutfifo[modnext])) = 0xFFFFFFFFUL;
 334                         aic_dmamap_sync(ahc, ahc->shared_data_dmat,
 335                                         ahc->shared_data_dmamap,
 336                                         /*offset*/modnext, /*len*/4,
 337                                         BUS_DMASYNC_PREREAD);
 338                 }
 339                 ahc->qoutfifonext++;
 340
 341                 scb = ahc_lookup_scb(ahc, scb_index);
 342                 if (scb == NULL) {
 343                         printf("%s: WARNING no command for scb %d "
 344                                "(cmdcmplt)\nQOUTPOS = %d\n",
 345                                ahc_name(ahc), scb_index,
 346                                (ahc->qoutfifonext - 1) & 0xFF);
 347                         continue;
 348                 }
 349
 350                 /*
 351                  * Save off the residual
 352                  * if there is one.
 353                  */
 354                 ahc_update_residual(ahc, scb);
 355                 ahc_done(ahc, scb);
 356         }
 357 }
 358
 359 void
 360 ahc_run_untagged_queues(struct ahc_softc *ahc)
 361 {
 362         int i;
 363
 364         for (i = 0; i < 16; i++)
 365                 ahc_run_untagged_queue(ahc, &ahc->untagged_queues[i]);
 366 }
 367
 368 void
 369 ahc_run_untagged_queue(struct ahc_softc *ahc, struct scb_tailq *queue)
 370 {
 371         struct scb *scb;
 372
 373         if (ahc->untagged_queue_lock != 0)
 374                 return;
 375
 376         if ((scb = TAILQ_FIRST(queue)) != NULL
 377          && (scb->flags & SCB_ACTIVE) == 0) {
 378                 scb->flags |= SCB_ACTIVE;
 379                 /*
 380                  * Timers are disabled while recovery is in progress.
 381                  */
 382                 aic_scb_timer_start(scb);
 383                 ahc_queue_scb(ahc, scb);
 384         }
 385 }
 386
 387 /************************* Interrupt Handling *********************************/
 388 void
 389 ahc_handle_brkadrint(struct ahc_softc *ahc)
 390 {
 391         /*
 392          * We upset the sequencer :-(
 393          * Lookup the error message
 394          */
 395         int i;
 396         int error;
 397
 398         error = ahc_inb(ahc, ERROR);
 399         for (i = 0; error != 1 && i < num_errors; i++)
 400                 error >>= 1;
 401         printf("%s: brkadrint, %s at seqaddr = 0x%x\n",
 402                ahc_name(ahc), ahc_hard_errors[i].errmesg,
 403                ahc_inb(ahc, SEQADDR0) |
 404                (ahc_inb(ahc, SEQADDR1) << 8));
 405
 406         ahc_dump_card_state(ahc);
 407
 408         /* Tell everyone that this HBA is no longer available */
 409         ahc_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
 410                        CAM_LUN_WILDCARD, SCB_LIST_NULL, ROLE_UNKNOWN,
 411                        CAM_NO_HBA);
 412
 413         /* Disable all interrupt sources by resetting the controller */
 414         ahc_shutdown(ahc);
 415 }
 416
 417 void
 418 ahc_handle_seqint(struct ahc_softc *ahc, u_int intstat)
 419 {
 420         struct scb *scb;
 421         struct ahc_devinfo devinfo;
 422
 423         ahc_fetch_devinfo(ahc, &devinfo);
 424
 425         /*
 426          * Clear the upper byte that holds SEQINT status
 427          * codes and clear the SEQINT bit. We will unpause
 428          * the sequencer, if appropriate, after servicing
 429          * the request.
 430          */
 431         ahc_outb(ahc, CLRINT, CLRSEQINT);
 432         switch (intstat & SEQINT_MASK) {
 433         case BAD_STATUS:
 434         {
 435                 u_int  scb_index;
 436                 struct hardware_scb *hscb;
 437
 438                 /*
 439                  * Set the default return value to 0 (don't
 440                  * send sense).  The sense code will change
 441                  * this if needed.
 442                  */
 443                 ahc_outb(ahc, RETURN_1, 0);
 444
 445                 /*
 446                  * The sequencer will notify us when a command
 447                  * has an error that would be of interest to
 448                  * the kernel.  This allows us to leave the sequencer
 449                  * running in the common case of command completes
 450                  * without error.  The sequencer will already have
 451                  * dma'd the SCB back up to us, so we can reference
 452                  * the in kernel copy directly.
 453                  */
 454                 scb_index = ahc_inb(ahc, SCB_TAG);
 455                 scb = ahc_lookup_scb(ahc, scb_index);
 456                 if (scb == NULL) {
 457                         ahc_print_devinfo(ahc, &devinfo);
 458                         printf("ahc_intr - referenced scb "
 459                                "not valid during seqint 0x%x scb(%d)\n",
 460                                intstat, scb_index);
 461                         ahc_dump_card_state(ahc);
 462                         panic("for safety");
 463                         goto unpause;
 464                 }
 465
 466                 hscb = scb->hscb;
 467
 468                 /* Don't want to clobber the original sense code */
 469                 if ((scb->flags & SCB_SENSE) != 0) {
 470                         /*
 471                          * Clear the SCB_SENSE Flag and have
 472                          * the sequencer do a normal command
 473                          * complete.
 474                          */
 475                         scb->flags &= ~SCB_SENSE;
 476                         aic_set_transaction_status(scb, CAM_AUTOSENSE_FAIL);
 477                         break;
 478                 }
 479                 aic_set_transaction_status(scb, CAM_SCSI_STATUS_ERROR);
 480                 /* Freeze the queue until the client sees the error. */
 481                 ahc_freeze_devq(ahc, scb);
 482                 aic_freeze_scb(scb);
 483                 aic_set_scsi_status(scb, hscb->shared_data.status.scsi_status);
 484                 switch (hscb->shared_data.status.scsi_status) {
 485                 case SCSI_STATUS_OK:
 486                         printf("%s: Interrupted for staus of 0???\n",
 487                                ahc_name(ahc));
 488                         break;
 489                 case SCSI_STATUS_CMD_TERMINATED:
 490                 case SCSI_STATUS_CHECK_COND:
 491                 {
 492                         struct ahc_dma_seg *sg;
 493                         struct scsi_sense *sc;
 494                         struct ahc_initiator_tinfo *targ_info;
 495                         struct ahc_tmode_tstate *tstate;
 496                         struct ahc_transinfo *tinfo;
 497 #ifdef AHC_DEBUG
 498                         if (ahc_debug & AHC_SHOW_SENSE) {
 499                                 ahc_print_path(ahc, scb);
 500                                 printf("SCB %d: requests Check Status\n",
 501                                        scb->hscb->tag);
 502                         }
 503 #endif
 504
 505                         if (aic_perform_autosense(scb) == 0)
 506                                 break;
 507
 508                         targ_info = ahc_fetch_transinfo(ahc,
 509                                                         devinfo.channel,
 510                                                         devinfo.our_scsiid,
 511                                                         devinfo.target,
 512                                                         &tstate);
 513                         tinfo = &targ_info->curr;
 514                         sg = scb->sg_list;
 515                         sc = (struct scsi_sense *)(&hscb->shared_data.cdb);
 516                         /*
 517                          * Save off the residual if there is one.
 518                          */
 519                         ahc_update_residual(ahc, scb);
 520 #ifdef AHC_DEBUG
 521                         if (ahc_debug & AHC_SHOW_SENSE) {
 522                                 ahc_print_path(ahc, scb);
 523                                 printf("Sending Sense\n");
 524                         }
 525 #endif
 526                         sg->addr = ahc_get_sense_bufaddr(ahc, scb);
 527                         sg->len = aic_get_sense_bufsize(ahc, scb);
 528                         sg->len |= AHC_DMA_LAST_SEG;
 529
 530                         /* Fixup byte order */
 531                         sg->addr = aic_htole32(sg->addr);
 532                         sg->len = aic_htole32(sg->len);
 533
 534                         sc->opcode = REQUEST_SENSE;
 535                         sc->byte2 = 0;
 536                         if (tinfo->protocol_version <= SCSI_REV_2
 537                          && SCB_GET_LUN(scb) < 8)
 538                                 sc->byte2 = SCB_GET_LUN(scb) << 5;
 539                         sc->unused[0] = 0;
 540                         sc->unused[1] = 0;
 541                         sc->length = sg->len;
 542                         sc->control = 0;
 543
 544                         /*
 545                          * We can't allow the target to disconnect.
 546                          * This will be an untagged transaction and
 547                          * having the target disconnect will make this
 548                          * transaction indestinguishable from outstanding
 549                          * tagged transactions.
 550                          */
 551                         hscb->control = 0;
 552
 553                         /*
 554                          * This request sense could be because the
 555                          * the device lost power or in some other
 556                          * way has lost our transfer negotiations.
 557                          * Renegotiate if appropriate.  Unit attention
 558                          * errors will be reported before any data
 559                          * phases occur.
 560                          */
 561                         if (aic_get_residual(scb)
 562                          == aic_get_transfer_length(scb)) {
 563                                 ahc_update_neg_request(ahc, &devinfo,
 564                                                        tstate, targ_info,
 565                                                        AHC_NEG_IF_NON_ASYNC);
 566                         }
 567                         if (tstate->auto_negotiate & devinfo.target_mask) {
 568                                 hscb->control |= MK_MESSAGE;
 569                                 scb->flags &= ~SCB_NEGOTIATE;
 570                                 scb->flags |= SCB_AUTO_NEGOTIATE;
 571                         }
 572                         hscb->cdb_len = sizeof(*sc);
 573                         hscb->dataptr = sg->addr;
 574                         hscb->datacnt = sg->len;
 575                         hscb->sgptr = scb->sg_list_phys | SG_FULL_RESID;
 576                         hscb->sgptr = aic_htole32(hscb->sgptr);
 577                         scb->sg_count = 1;
 578                         scb->flags |= SCB_SENSE;
 579                         ahc_qinfifo_requeue_tail(ahc, scb);
 580                         ahc_outb(ahc, RETURN_1, SEND_SENSE);
 581                         /*
 582                          * Ensure we have enough time to actually
 583                          * retrieve the sense, but only schedule
 584                          * the timer if we are not in recovery or
 585                          * this is a recovery SCB that is allowed
 586                          * to have an active timer.
 587                          */
 588                         if (ahc->scb_data->recovery_scbs == 0
 589                          || (scb->flags & SCB_RECOVERY_SCB) != 0)
 590                                 aic_scb_timer_reset(scb, 5 * 1000);
 591                         break;
 592                 }
 593                 default:
 594                         break;
 595                 }
 596                 break;
 597         }
 598         case NO_MATCH:
 599         {
 600                 /* Ensure we don't leave the selection hardware on */
 601                 ahc_outb(ahc, SCSISEQ,
 602                          ahc_inb(ahc, SCSISEQ) & (ENSELI|ENRSELI|ENAUTOATNP));
 603
 604                 printf("%s:%c:%d: no active SCB for reconnecting "
 605                        "target - issuing BUS DEVICE RESET\n",
 606                        ahc_name(ahc), devinfo.channel, devinfo.target);
 607                 printf("SAVED_SCSIID == 0x%x, SAVED_LUN == 0x%x, "
 608                        "ARG_1 == 0x%x ACCUM = 0x%x\n",
 609                        ahc_inb(ahc, SAVED_SCSIID), ahc_inb(ahc, SAVED_LUN),
 610                        ahc_inb(ahc, ARG_1), ahc_inb(ahc, ACCUM));
 611                 printf("SEQ_FLAGS == 0x%x, SCBPTR == 0x%x, BTT == 0x%x, "
 612                        "SINDEX == 0x%x\n",
 613                        ahc_inb(ahc, SEQ_FLAGS), ahc_inb(ahc, SCBPTR),
 614                        ahc_index_busy_tcl(ahc,
 615                             BUILD_TCL(ahc_inb(ahc, SAVED_SCSIID),
 616                                       ahc_inb(ahc, SAVED_LUN))),
 617                        ahc_inb(ahc, SINDEX));
 618                 printf("SCSIID == 0x%x, SCB_SCSIID == 0x%x, SCB_LUN == 0x%x, "
 619                        "SCB_TAG == 0x%x, SCB_CONTROL == 0x%x\n",
 620                        ahc_inb(ahc, SCSIID), ahc_inb(ahc, SCB_SCSIID),
 621                        ahc_inb(ahc, SCB_LUN), ahc_inb(ahc, SCB_TAG),
 622                        ahc_inb(ahc, SCB_CONTROL));
 623                 printf("SCSIBUSL == 0x%x, SCSISIGI == 0x%x\n",
 624                        ahc_inb(ahc, SCSIBUSL), ahc_inb(ahc, SCSISIGI));
 625                 printf("SXFRCTL0 == 0x%x\n", ahc_inb(ahc, SXFRCTL0));
 626                 printf("SEQCTL == 0x%x\n", ahc_inb(ahc, SEQCTL));
 627                 ahc_dump_card_state(ahc);
 628                 ahc->msgout_buf[0] = MSG_BUS_DEV_RESET;
 629                 ahc->msgout_len = 1;
 630                 ahc->msgout_index = 0;
 631                 ahc->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
 632                 ahc_outb(ahc, MSG_OUT, HOST_MSG);
 633                 ahc_assert_atn(ahc);
 634                 break;
 635         }
 636         case SEND_REJECT:
 637         {
 638                 u_int rejbyte = ahc_inb(ahc, ACCUM);
 639                 printf("%s:%c:%d: Warning - unknown message received from "
 640                        "target (0x%x).  Rejecting\n",
 641                        ahc_name(ahc), devinfo.channel, devinfo.target, rejbyte);
 642                 break;
 643         }
 644         case PROTO_VIOLATION:
 645         {
 646                 ahc_handle_proto_violation(ahc);
 647                 break;
 648         }
 649         case IGN_WIDE_RES:
 650                 ahc_handle_ign_wide_residue(ahc, &devinfo);
 651                 break;
 652         case PDATA_REINIT:
 653                 ahc_reinitialize_dataptrs(ahc);
 654                 break;
 655         case BAD_PHASE:
 656         {
 657                 u_int lastphase;
 658
 659                 lastphase = ahc_inb(ahc, LASTPHASE);
 660                 printf("%s:%c:%d: unknown scsi bus phase %x, "
 661                        "lastphase = 0x%x.  Attempting to continue\n",
 662                        ahc_name(ahc), devinfo.channel, devinfo.target,
 663                        lastphase, ahc_inb(ahc, SCSISIGI));
 664                 break;
 665         }
 666         case MISSED_BUSFREE:
 667         {
 668                 u_int lastphase;
 669
 670                 lastphase = ahc_inb(ahc, LASTPHASE);
 671                 printf("%s:%c:%d: Missed busfree. "
 672                        "Lastphase = 0x%x, Curphase = 0x%x\n",
 673                        ahc_name(ahc), devinfo.channel, devinfo.target,
 674                        lastphase, ahc_inb(ahc, SCSISIGI));
 675                 ahc_restart(ahc);
 676                 return;
 677         }
 678         case HOST_MSG_LOOP:
 679         {
 680                 /*
 681                  * The sequencer has encountered a message phase
 682                  * that requires host assistance for completion.
 683                  * While handling the message phase(s), we will be
 684                  * notified by the sequencer after each byte is
 685                  * transferred so we can track bus phase changes.
 686                  *
 687                  * If this is the first time we've seen a HOST_MSG_LOOP
 688                  * interrupt, initialize the state of the host message
 689                  * loop.
 690                  */
 691                 if (ahc->msg_type == MSG_TYPE_NONE) {
 692                         struct scb *scb;
 693                         u_int scb_index;
 694                         u_int bus_phase;
 695
 696                         bus_phase = ahc_inb(ahc, SCSISIGI) & PHASE_MASK;
 697                         if (bus_phase != P_MESGIN
 698                          && bus_phase != P_MESGOUT) {
 699                                 printf("ahc_intr: HOST_MSG_LOOP bad "
 700                                        "phase 0x%x\n",
 701                                       bus_phase);
 702                                 /*
 703                                  * Probably transitioned to bus free before
 704                                  * we got here.  Just punt the message.
 705                                  */
 706                                 ahc_clear_intstat(ahc);
 707                                 ahc_restart(ahc);
 708                                 return;
 709                         }
 710
 711                         scb_index = ahc_inb(ahc, SCB_TAG);
 712                         scb = ahc_lookup_scb(ahc, scb_index);
 713                         if (devinfo.role == ROLE_INITIATOR) {
 714                                 if (scb == NULL)
 715                                         panic("HOST_MSG_LOOP with "
 716                                               "invalid SCB %x\n", scb_index);
 717
 718                                 if (bus_phase == P_MESGOUT)
 719                                         ahc_setup_initiator_msgout(ahc,
 720                                                                    &devinfo,
 721                                                                    scb);
 722                                 else {
 723                                         ahc->msg_type =
 724                                             MSG_TYPE_INITIATOR_MSGIN;
 725                                         ahc->msgin_index = 0;
 726                                 }
 727                         }
 728 #ifdef AHC_TARGET_MODE
 729                         else {
 730                                 if (bus_phase == P_MESGOUT) {
 731                                         ahc->msg_type =
 732                                             MSG_TYPE_TARGET_MSGOUT;
 733                                         ahc->msgin_index = 0;
 734                                 }
 735                                 else
 736                                         ahc_setup_target_msgin(ahc,
 737                                                                &devinfo,
 738                                                                scb);
 739                         }
 740 #endif
 741                 }
 742
 743                 ahc_handle_message_phase(ahc);
 744                 break;
 745         }
 746         case PERR_DETECTED:
 747         {
 748                 /*
 749                  * If we've cleared the parity error interrupt
 750                  * but the sequencer still believes that SCSIPERR
 751                  * is true, it must be that the parity error is
 752                  * for the currently presented byte on the bus,
 753                  * and we are not in a phase (data-in) where we will
 754                  * eventually ack this byte.  Ack the byte and
 755                  * throw it away in the hope that the target will
 756                  * take us to message out to deliver the appropriate
 757                  * error message.
 758                  */
 759                 if ((intstat & SCSIINT) == 0
 760                  && (ahc_inb(ahc, SSTAT1) & SCSIPERR) != 0) {
 761
 762                         if ((ahc->features & AHC_DT) == 0) {
 763                                 u_int curphase;
 764
 765                                 /*
 766                                  * The hardware will only let you ack bytes
 767                                  * if the expected phase in SCSISIGO matches
 768                                  * the current phase.  Make sure this is
 769                                  * currently the case.
 770                                  */
 771                                 curphase = ahc_inb(ahc, SCSISIGI) & PHASE_MASK;
 772                                 ahc_outb(ahc, LASTPHASE, curphase);
 773                                 ahc_outb(ahc, SCSISIGO, curphase);
 774                         }
 775                         if ((ahc_inb(ahc, SCSISIGI) & (CDI|MSGI)) == 0) {
 776                                 int wait;
 777
 778                                 /*
 779                                  * In a data phase.  Faster to bitbucket
 780                                  * the data than to individually ack each
 781                                  * byte.  This is also the only strategy
 782                                  * that will work with AUTOACK enabled.
 783                                  */
 784                                 ahc_outb(ahc, SXFRCTL1,
 785                                          ahc_inb(ahc, SXFRCTL1) | BITBUCKET);
 786                                 wait = 5000;
 787                                 while (--wait != 0) {
 788                                         if ((ahc_inb(ahc, SCSISIGI)
 789                                           & (CDI|MSGI)) != 0)
 790                                                 break;
 791                                         aic_delay(100);
 792                                 }
 793                                 ahc_outb(ahc, SXFRCTL1,
 794                                          ahc_inb(ahc, SXFRCTL1) & ~BITBUCKET);
 795                                 if (wait == 0) {
 796                                         struct  scb *scb;
 797                                         u_int   scb_index;
 798
 799                                         ahc_print_devinfo(ahc, &devinfo);
 800                                         printf("Unable to clear parity error.  "
 801                                                "Resetting bus.\n");
 802                                         scb_index = ahc_inb(ahc, SCB_TAG);
 803                                         scb = ahc_lookup_scb(ahc, scb_index);
 804                                         if (scb != NULL)
 805                                                 aic_set_transaction_status(scb,
 806                                                     CAM_UNCOR_PARITY);
 807                                         ahc_reset_channel(ahc, devinfo.channel,
 808                                                           /*init reset*/TRUE);
 809                                 }
 810                         } else {
 811                                 ahc_inb(ahc, SCSIDATL);
 812                         }
 813                 }
 814                 break;
 815         }
 816         case DATA_OVERRUN:
 817         {
 818                 /*
 819                  * When the sequencer detects an overrun, it
 820                  * places the controller in "BITBUCKET" mode
 821                  * and allows the target to complete its transfer.
 822                  * Unfortunately, none of the counters get updated
 823                  * when the controller is in this mode, so we have
 824                  * no way of knowing how large the overrun was.
 825                  */
 826                 u_int scbindex = ahc_inb(ahc, SCB_TAG);
 827                 u_int lastphase = ahc_inb(ahc, LASTPHASE);
 828                 u_int i;
 829
 830                 scb = ahc_lookup_scb(ahc, scbindex);
 831                 for (i = 0; i < num_phases; i++) {
 832                         if (lastphase == ahc_phase_table[i].phase)
 833                                 break;
 834                 }
 835                 ahc_print_path(ahc, scb);
 836                 printf("data overrun detected %s."
 837                        "  Tag == 0x%x.\n",
 838                        ahc_phase_table[i].phasemsg,
 839                        scb->hscb->tag);
 840                 ahc_print_path(ahc, scb);
 841                 printf("%s seen Data Phase.  Length = %ld.  NumSGs = %d.\n",
 842                        ahc_inb(ahc, SEQ_FLAGS) & DPHASE ? "Have" : "Haven't",
 843                        aic_get_transfer_length(scb), scb->sg_count);
 844                 if (scb->sg_count > 0) {
 845                         for (i = 0; i < scb->sg_count; i++) {
 846
 847                                 printf("sg[%d] - Addr 0x%x%x : Length %d\n",
 848                                        i,
 849                                        (aic_le32toh(scb->sg_list[i].len) >> 24
 850                                         & SG_HIGH_ADDR_BITS),
 851                                        aic_le32toh(scb->sg_list[i].addr),
 852                                        aic_le32toh(scb->sg_list[i].len)
 853                                        & AHC_SG_LEN_MASK);
 854                         }
 855                 }
 856                 /*
 857                  * Set this and it will take effect when the
 858                  * target does a command complete.
 859                  */
 860                 ahc_freeze_devq(ahc, scb);
 861                 if ((scb->flags & SCB_SENSE) == 0) {
 862                         aic_set_transaction_status(scb, CAM_DATA_RUN_ERR);
 863                 } else {
 864                         scb->flags &= ~SCB_SENSE;
 865                         aic_set_transaction_status(scb, CAM_AUTOSENSE_FAIL);
 866                 }
 867                 aic_freeze_scb(scb);
 868
 869                 if ((ahc->features & AHC_ULTRA2) != 0) {
 870                         /*
 871                          * Clear the channel in case we return
 872                          * to data phase later.
 873                          */
 874                         ahc_outb(ahc, SXFRCTL0,
 875                                  ahc_inb(ahc, SXFRCTL0) | CLRSTCNT|CLRCHN);
 876                         ahc_outb(ahc, SXFRCTL0,
 877                                  ahc_inb(ahc, SXFRCTL0) | CLRSTCNT|CLRCHN);
 878                 }
 879                 if ((ahc->flags & AHC_39BIT_ADDRESSING) != 0) {
 880                         u_int dscommand1;
 881
 882                         /* Ensure HHADDR is 0 for future DMA operations. */
 883                         dscommand1 = ahc_inb(ahc, DSCOMMAND1);
 884                         ahc_outb(ahc, DSCOMMAND1, dscommand1 | HADDLDSEL0);
 885                         ahc_outb(ahc, HADDR, 0);
 886                         ahc_outb(ahc, DSCOMMAND1, dscommand1);
 887                 }
 888                 break;
 889         }
 890         case MKMSG_FAILED:
 891         {
 892                 u_int scbindex;
 893
 894                 printf("%s:%c:%d:%d: Attempt to issue message failed\n",
 895                        ahc_name(ahc), devinfo.channel, devinfo.target,
 896                        devinfo.lun);
 897                 scbindex = ahc_inb(ahc, SCB_TAG);
 898                 scb = ahc_lookup_scb(ahc, scbindex);
 899                 if (scb != NULL
 900                  && (scb->flags & SCB_RECOVERY_SCB) != 0)
 901                         /*
 902                          * Ensure that we didn't put a second instance of this
 903                          * SCB into the QINFIFO.
 904                          */
 905                         ahc_search_qinfifo(ahc, SCB_GET_TARGET(ahc, scb),
 906                                            SCB_GET_CHANNEL(ahc, scb),
 907                                            SCB_GET_LUN(scb), scb->hscb->tag,
 908                                            ROLE_INITIATOR, /*status*/0,
 909                                            SEARCH_REMOVE);
 910                 break;
 911         }
 912         case NO_FREE_SCB:
 913         {
 914                 printf("%s: No free or disconnected SCBs\n", ahc_name(ahc));
 915                 ahc_dump_card_state(ahc);
 916                 panic("for safety");
 917                 break;
 918         }
 919         case SCB_MISMATCH:
 920         {
 921                 u_int scbptr;
 922
 923                 scbptr = ahc_inb(ahc, SCBPTR);
 924                 printf("Bogus TAG after DMA.  SCBPTR %d, tag %d, our tag %d\n",
 925                        scbptr, ahc_inb(ahc, ARG_1),
 926                        ahc->scb_data->hscbs[scbptr].tag);
 927                 ahc_dump_card_state(ahc);
 928                 panic("for safety");
 929                 break;
 930         }
 931         case OUT_OF_RANGE:
 932         {
 933                 printf("%s: BTT calculation out of range\n", ahc_name(ahc));
 934                 printf("SAVED_SCSIID == 0x%x, SAVED_LUN == 0x%x, "
 935                        "ARG_1 == 0x%x ACCUM = 0x%x\n",
 936                        ahc_inb(ahc, SAVED_SCSIID), ahc_inb(ahc, SAVED_LUN),
 937                        ahc_inb(ahc, ARG_1), ahc_inb(ahc, ACCUM));
 938                 printf("SEQ_FLAGS == 0x%x, SCBPTR == 0x%x, BTT == 0x%x, "
 939                        "SINDEX == 0x%x\n, A == 0x%x\n",
 940                        ahc_inb(ahc, SEQ_FLAGS), ahc_inb(ahc, SCBPTR),
 941                        ahc_index_busy_tcl(ahc,
 942                             BUILD_TCL(ahc_inb(ahc, SAVED_SCSIID),
 943                                       ahc_inb(ahc, SAVED_LUN))),
 944                        ahc_inb(ahc, SINDEX),
 945                        ahc_inb(ahc, ACCUM));
 946                 printf("SCSIID == 0x%x, SCB_SCSIID == 0x%x, SCB_LUN == 0x%x, "
 947                        "SCB_TAG == 0x%x, SCB_CONTROL == 0x%x\n",
 948                        ahc_inb(ahc, SCSIID), ahc_inb(ahc, SCB_SCSIID),
 949                        ahc_inb(ahc, SCB_LUN), ahc_inb(ahc, SCB_TAG),
 950                        ahc_inb(ahc, SCB_CONTROL));
 951                 printf("SCSIBUSL == 0x%x, SCSISIGI == 0x%x\n",
 952                        ahc_inb(ahc, SCSIBUSL), ahc_inb(ahc, SCSISIGI));
 953                 ahc_dump_card_state(ahc);
 954                 panic("for safety");
 955                 break;
 956         }
 957         default:
 958                 printf("ahc_intr: seqint, "
 959                        "intstat == 0x%x, scsisigi = 0x%x\n",
 960                        intstat, ahc_inb(ahc, SCSISIGI));
 961                 break;
 962         }
 963 unpause:
 964         /*
 965          *  The sequencer is paused immediately on
 966          *  a SEQINT, so we should restart it when
 967          *  we're done.
 968          */
 969         ahc_unpause(ahc);
 970 }
 971
 972 void
 973 ahc_handle_scsiint(struct ahc_softc *ahc, u_int intstat)
 974 {
 975         u_int   scb_index;
 976         u_int   status0;
 977         u_int   status;
 978         struct  scb *scb;
 979         char    cur_channel;
 980         char    intr_channel;
 981
 982         if ((ahc->features & AHC_TWIN) != 0
 983          && ((ahc_inb(ahc, SBLKCTL) & SELBUSB) != 0))
 984                 cur_channel = 'B';
 985         else
 986                 cur_channel = 'A';
 987         intr_channel = cur_channel;
 988
 989         if ((ahc->features & AHC_ULTRA2) != 0)
 990                 status0 = ahc_inb(ahc, SSTAT0) & IOERR;
 991         else
 992                 status0 = 0;
 993         status = ahc_inb(ahc, SSTAT1) & (SELTO|SCSIRSTI|BUSFREE|SCSIPERR);
 994         if (status == 0 && status0 == 0) {
 995                 if ((ahc->features & AHC_TWIN) != 0) {
 996                         /* Try the other channel */
 997                         ahc_outb(ahc, SBLKCTL, ahc_inb(ahc, SBLKCTL) ^ SELBUSB);
 998                         status = ahc_inb(ahc, SSTAT1)
 999                                & (SELTO|SCSIRSTI|BUSFREE|SCSIPERR);
1000                         intr_channel = (cur_channel == 'A') ? 'B' : 'A';
1001                 }
1002                 if (status == 0) {
1003                         printf("%s: Spurious SCSI interrupt\n", ahc_name(ahc));
1004                         ahc_outb(ahc, CLRINT, CLRSCSIINT);
1005                         ahc_unpause(ahc);
1006                         return;
1007                 }
1008         }
1009
1010         /* Make sure the sequencer is in a safe location. */
1011         ahc_clear_critical_section(ahc);
1012
1013         scb_index = ahc_inb(ahc, SCB_TAG);
1014         scb = ahc_lookup_scb(ahc, scb_index);
1015         if (scb != NULL
1016          && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) != 0)
1017                 scb = NULL;
1018
1019         if ((ahc->features & AHC_ULTRA2) != 0
1020          && (status0 & IOERR) != 0) {
1021                 int now_lvd;
1022
1023                 now_lvd = ahc_inb(ahc, SBLKCTL) & ENAB40;
1024                 printf("%s: Transceiver State Has Changed to %s mode\n",
1025                        ahc_name(ahc), now_lvd ? "LVD" : "SE");
1026                 ahc_outb(ahc, CLRSINT0, CLRIOERR);
1027                 /*
1028                  * When transitioning to SE mode, the reset line
1029                  * glitches, triggering an arbitration bug in some
1030                  * Ultra2 controllers.  This bug is cleared when we
1031                  * assert the reset line.  Since a reset glitch has
1032                  * already occurred with this transition and a
1033                  * transceiver state change is handled just like
1034                  * a bus reset anyway, asserting the reset line
1035                  * ourselves is safe.
1036                  */
1037                 ahc_reset_channel(ahc, intr_channel,
1038                                  /*Initiate Reset*/now_lvd == 0);
1039         } else if ((status & SCSIRSTI) != 0) {
1040                 printf("%s: Someone reset channel %c\n",
1041                         ahc_name(ahc), intr_channel);
1042                 if (intr_channel != cur_channel)
1043                         ahc_outb(ahc, SBLKCTL, ahc_inb(ahc, SBLKCTL) ^ SELBUSB);
1044                 ahc_reset_channel(ahc, intr_channel, /*Initiate Reset*/FALSE);
1045         } else if ((status & SCSIPERR) != 0) {
1046                 /*
1047                  * Determine the bus phase and queue an appropriate message.
1048                  * SCSIPERR is latched true as soon as a parity error
1049                  * occurs.  If the sequencer acked the transfer that
1050                  * caused the parity error and the currently presented
1051                  * transfer on the bus has correct parity, SCSIPERR will
1052                  * be cleared by CLRSCSIPERR.  Use this to determine if
1053                  * we should look at the last phase the sequencer recorded,
1054                  * or the current phase presented on the bus.
1055                  */
1056                 struct  ahc_devinfo devinfo;
1057                 u_int   mesg_out;
1058                 u_int   curphase;
1059                 u_int   errorphase;
1060                 u_int   lastphase;
1061                 u_int   scsirate;
1062                 u_int   i;
1063                 u_int   sstat2;
1064                 int     silent;
1065
1066                 lastphase = ahc_inb(ahc, LASTPHASE);
1067                 curphase = ahc_inb(ahc, SCSISIGI) & PHASE_MASK;
1068                 sstat2 = ahc_inb(ahc, SSTAT2);
1069                 ahc_outb(ahc, CLRSINT1, CLRSCSIPERR);
1070                 /*
1071                  * For all phases save DATA, the sequencer won't
1072                  * automatically ack a byte that has a parity error
1073                  * in it.  So the only way that the current phase
1074                  * could be 'data-in' is if the parity error is for
1075                  * an already acked byte in the data phase.  During
1076                  * synchronous data-in transfers, we may actually
1077                  * ack bytes before latching the current phase in
1078                  * LASTPHASE, leading to the discrepancy between
1079                  * curphase and lastphase.
1080                  */
1081                 if ((ahc_inb(ahc, SSTAT1) & SCSIPERR) != 0
1082                  || curphase == P_DATAIN || curphase == P_DATAIN_DT)
1083                         errorphase = curphase;
1084                 else
1085                         errorphase = lastphase;
1086
1087                 for (i = 0; i < num_phases; i++) {
1088                         if (errorphase == ahc_phase_table[i].phase)
1089                                 break;
1090                 }
1091                 mesg_out = ahc_phase_table[i].mesg_out;
1092                 silent = FALSE;
1093                 if (scb != NULL) {
1094                         if (SCB_IS_SILENT(scb))
1095                                 silent = TRUE;
1096                         else
1097                                 ahc_print_path(ahc, scb);
1098                         scb->flags |= SCB_TRANSMISSION_ERROR;
1099                 } else
1100                         printf("%s:%c:%d: ", ahc_name(ahc), intr_channel,
1101                                SCSIID_TARGET(ahc, ahc_inb(ahc, SAVED_SCSIID)));
1102                 scsirate = ahc_inb(ahc, SCSIRATE);
1103                 if (silent == FALSE) {
1104                         printf("parity error detected %s. "
1105                                "SEQADDR(0x%x) SCSIRATE(0x%x)\n",
1106                                ahc_phase_table[i].phasemsg,
1107                                ahc_inw(ahc, SEQADDR0),
1108                                scsirate);
1109                         if ((ahc->features & AHC_DT) != 0) {
1110                                 if ((sstat2 & CRCVALERR) != 0)
1111                                         printf("\tCRC Value Mismatch\n");
1112                                 if ((sstat2 & CRCENDERR) != 0)
1113                                         printf("\tNo terminal CRC packet "
1114                                                "recevied\n");
1115                                 if ((sstat2 & CRCREQERR) != 0)
1116                                         printf("\tIllegal CRC packet "
1117                                                "request\n");
1118                                 if ((sstat2 & DUAL_EDGE_ERR) != 0)
1119                                         printf("\tUnexpected %sDT Data Phase\n",
1120                                                (scsirate & SINGLE_EDGE)
1121                                              ? "" : "non-");
1122                         }
1123                 }
1124
1125                 if ((ahc->features & AHC_DT) != 0
1126                  && (sstat2 & DUAL_EDGE_ERR) != 0) {
1127                         /*
1128                          * This error applies regardless of
1129                          * data direction, so ignore the value
1130                          * in the phase table.
1131                          */
1132                         mesg_out = MSG_INITIATOR_DET_ERR;
1133                 }
1134
1135                 /*
1136                  * We've set the hardware to assert ATN if we
1137                  * get a parity error on "in" phases, so all we
1138                  * need to do is stuff the message buffer with
1139                  * the appropriate message.  "In" phases have set
1140                  * mesg_out to something other than MSG_NOP.
1141                  */
1142                 if (mesg_out != MSG_NOOP) {
1143                         if (ahc->msg_type != MSG_TYPE_NONE)
1144                                 ahc->send_msg_perror = TRUE;
1145                         else
1146                                 ahc_outb(ahc, MSG_OUT, mesg_out);
1147                 }
1148                 /*
1149                  * Force a renegotiation with this target just in
1150                  * case we are out of sync for some external reason
1151                  * unknown (or unreported) by the target.
1152                  */
1153                 ahc_fetch_devinfo(ahc, &devinfo);
1154                 ahc_force_renegotiation(ahc, &devinfo);
1155
1156                 ahc_outb(ahc, CLRINT, CLRSCSIINT);
1157                 ahc_unpause(ahc);
1158         } else if ((status & SELTO) != 0) {
1159                 u_int   scbptr;
1160
1161                 /* Stop the selection */
1162                 ahc_outb(ahc, SCSISEQ, 0);
1163
1164                 /* No more pending messages */
1165                 ahc_clear_msg_state(ahc);
1166
1167                 /* Clear interrupt state */
1168                 ahc_outb(ahc, SIMODE1, ahc_inb(ahc, SIMODE1) & ~ENBUSFREE);
1169                 ahc_outb(ahc, CLRSINT1, CLRSELTIMEO|CLRBUSFREE|CLRSCSIPERR);
1170
1171                 /*
1172                  * Although the driver does not care about the
1173                  * 'Selection in Progress' status bit, the busy
1174                  * LED does.  SELINGO is only cleared by a successful
1175                  * selection, so we must manually clear it to insure
1176                  * the LED turns off just incase no future successful
1177                  * selections occur (e.g. no devices on the bus).
1178                  */
1179                 ahc_outb(ahc, CLRSINT0, CLRSELINGO);
1180
1181                 scbptr = ahc_inb(ahc, WAITING_SCBH);
1182                 ahc_outb(ahc, SCBPTR, scbptr);
1183                 scb_index = ahc_inb(ahc, SCB_TAG);
1184
1185                 scb = ahc_lookup_scb(ahc, scb_index);
1186                 if (scb == NULL) {
1187                         printf("%s: ahc_intr - referenced scb not "
1188                                "valid during SELTO scb(%d, %d)\n",
1189                                ahc_name(ahc), scbptr, scb_index);
1190                         ahc_dump_card_state(ahc);
1191                 } else {
1192                         struct ahc_devinfo devinfo;
1193 #ifdef AHC_DEBUG
1194                         if ((ahc_debug & AHC_SHOW_SELTO) != 0) {
1195                                 ahc_print_path(ahc, scb);
1196                                 printf("Saw Selection Timeout for SCB 0x%x\n",
1197                                        scb_index);
1198                         }
1199 #endif
1200                         ahc_scb_devinfo(ahc, &devinfo, scb);
1201                         aic_set_transaction_status(scb, CAM_SEL_TIMEOUT);
1202                         ahc_freeze_devq(ahc, scb);
1203
1204                         /*
1205                          * Cancel any pending transactions on the device
1206                          * now that it seems to be missing.  This will
1207                          * also revert us to async/narrow transfers until
1208                          * we can renegotiate with the device.
1209                          */
1210                         ahc_handle_devreset(ahc, &devinfo,
1211                                             CAM_SEL_TIMEOUT,
1212                                             "Selection Timeout",
1213                                             /*verbose_level*/1);
1214                 }
1215                 ahc_outb(ahc, CLRINT, CLRSCSIINT);
1216                 ahc_restart(ahc);
1217         } else if ((status & BUSFREE) != 0
1218                 && (ahc_inb(ahc, SIMODE1) & ENBUSFREE) != 0) {
1219                 struct  ahc_devinfo devinfo;
1220                 u_int   lastphase;
1221                 u_int   saved_scsiid;
1222                 u_int   saved_lun;
1223                 u_int   target;
1224                 u_int   initiator_role_id;
1225                 char    channel;
1226                 int     printerror;
1227
1228                 /*
1229                  * Clear our selection hardware as soon as possible.
1230                  * We may have an entry in the waiting Q for this target,
1231                  * that is affected by this busfree and we don't want to
1232                  * go about selecting the target while we handle the event.
1233                  */
1234                 ahc_outb(ahc, SCSISEQ,
1235                          ahc_inb(ahc, SCSISEQ) & (ENSELI|ENRSELI|ENAUTOATNP));
1236
1237                 /*
1238                  * Disable busfree interrupts and clear the busfree
1239                  * interrupt status.  We do this here so that several
1240                  * bus transactions occur prior to clearing the SCSIINT
1241                  * latch.  It can take a bit for the clearing to take effect.
1242                  */
1243                 ahc_outb(ahc, SIMODE1, ahc_inb(ahc, SIMODE1) & ~ENBUSFREE);
1244                 ahc_outb(ahc, CLRSINT1, CLRBUSFREE|CLRSCSIPERR);
1245
1246                 /*
1247                  * Look at what phase we were last in.
1248                  * If its message out, chances are pretty good
1249                  * that the busfree was in response to one of
1250                  * our abort requests.
1251                  */
1252                 lastphase = ahc_inb(ahc, LASTPHASE);
1253                 saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
1254                 saved_lun = ahc_inb(ahc, SAVED_LUN);
1255                 target = SCSIID_TARGET(ahc, saved_scsiid);
1256                 initiator_role_id = SCSIID_OUR_ID(saved_scsiid);
1257                 channel = SCSIID_CHANNEL(ahc, saved_scsiid);
1258                 ahc_compile_devinfo(&devinfo, initiator_role_id,
1259                                     target, saved_lun, channel, ROLE_INITIATOR);
1260                 printerror = 1;
1261
1262                 if (lastphase == P_MESGOUT) {
1263                         u_int tag;
1264
1265                         tag = SCB_LIST_NULL;
1266                         if (ahc_sent_msg(ahc, AHCMSG_1B, MSG_ABORT_TAG, TRUE)
1267                          || ahc_sent_msg(ahc, AHCMSG_1B, MSG_ABORT, TRUE)) {
1268                                 if (ahc->msgout_buf[ahc->msgout_index - 1]
1269                                  == MSG_ABORT_TAG)
1270                                         tag = scb->hscb->tag;
1271                                 ahc_print_path(ahc, scb);
1272                                 printf("SCB %d - Abort%s Completed.\n",
1273                                        scb->hscb->tag, tag == SCB_LIST_NULL ?
1274                                        "" : " Tag");
1275                                 ahc_abort_scbs(ahc, target, channel,
1276                                                saved_lun, tag,
1277                                                ROLE_INITIATOR,
1278                                                CAM_REQ_ABORTED);
1279                                 printerror = 0;
1280                         } else if (ahc_sent_msg(ahc, AHCMSG_1B,
1281                                                 MSG_BUS_DEV_RESET, TRUE)) {
1282 #ifdef __FreeBSD__
1283                                 /*
1284                                  * Don't mark the user's request for this BDR
1285                                  * as completing with CAM_BDR_SENT.  CAM3
1286                                  * specifies CAM_REQ_CMP.
1287                                  */
1288                                 if (scb != NULL
1289                                  && scb->io_ctx->ccb_h.func_code== XPT_RESET_DEV
1290                                  && ahc_match_scb(ahc, scb, target, channel,
1291                                                   CAM_LUN_WILDCARD,
1292                                                   SCB_LIST_NULL,
1293                                                   ROLE_INITIATOR)) {
1294                                         aic_set_transaction_status(scb, CAM_REQ_CMP);
1295                                 }
1296 #endif
1297                                 ahc_compile_devinfo(&devinfo,
1298                                                     initiator_role_id,
1299                                                     target,
1300                                                     CAM_LUN_WILDCARD,
1301                                                     channel,
1302                                                     ROLE_INITIATOR);
1303                                 ahc_handle_devreset(ahc, &devinfo,
1304                                                     CAM_BDR_SENT,
1305                                                     "Bus Device Reset",
1306                                                     /*verbose_level*/0);
1307                                 printerror = 0;
1308                         } else if (ahc_sent_msg(ahc, AHCMSG_EXT,
1309                                                 MSG_EXT_PPR, FALSE)) {
1310                                 struct ahc_initiator_tinfo *tinfo;
1311                                 struct ahc_tmode_tstate *tstate;
1312
1313                                 /*
1314                                  * PPR Rejected.  Try non-ppr negotiation
1315                                  * and retry command.
1316                                  */
1317                                 tinfo = ahc_fetch_transinfo(ahc,
1318                                                             devinfo.channel,
1319                                                             devinfo.our_scsiid,
1320                                                             devinfo.target,
1321                                                             &tstate);
1322                                 tinfo->curr.transport_version = 2;
1323                                 tinfo->goal.transport_version = 2;
1324                                 tinfo->goal.ppr_options = 0;
1325                                 ahc_qinfifo_requeue_tail(ahc, scb);
1326                                 printerror = 0;
1327                         } else if (ahc_sent_msg(ahc, AHCMSG_EXT,
1328                                                 MSG_EXT_WDTR, FALSE)) {
1329                                 /*
1330                                  * Negotiation Rejected.  Go-narrow and
1331                                  * retry command.
1332                                  */
1333                                 ahc_set_width(ahc, &devinfo,
1334                                               MSG_EXT_WDTR_BUS_8_BIT,
1335                                               AHC_TRANS_CUR|AHC_TRANS_GOAL,
1336                                               /*paused*/TRUE);
1337                                 ahc_qinfifo_requeue_tail(ahc, scb);
1338                                 printerror = 0;
1339                         } else if (ahc_sent_msg(ahc, AHCMSG_EXT,
1340                                                 MSG_EXT_SDTR, FALSE)) {
1341                                 /*
1342                                  * Negotiation Rejected.  Go-async and
1343                                  * retry command.
1344                                  */
1345                                 ahc_set_syncrate(ahc, &devinfo,
1346                                                 /*syncrate*/NULL,
1347                                                 /*period*/0, /*offset*/0,
1348                                                 /*ppr_options*/0,
1349                                                 AHC_TRANS_CUR|AHC_TRANS_GOAL,
1350                                                 /*paused*/TRUE);
1351                                 ahc_qinfifo_requeue_tail(ahc, scb);
1352                                 printerror = 0;
1353                         }
1354                 }
1355                 if (printerror != 0) {
1356                         u_int i;
1357
1358                         if (scb != NULL) {
1359                                 u_int tag;
1360
1361                                 if ((scb->hscb->control & TAG_ENB) != 0)
1362                                         tag = scb->hscb->tag;
1363                                 else
1364                                         tag = SCB_LIST_NULL;
1365                                 ahc_print_path(ahc, scb);
1366                                 ahc_abort_scbs(ahc, target, channel,
1367                                                SCB_GET_LUN(scb), tag,
1368                                                ROLE_INITIATOR,
1369                                                CAM_UNEXP_BUSFREE);
1370                         } else {
1371                                 /*
1372                                  * We had not fully identified this connection,
1373                                  * so we cannot abort anything.
1374                                  */
1375                                 printf("%s: ", ahc_name(ahc));
1376                         }
1377                         for (i = 0; i < num_phases; i++) {
1378                                 if (lastphase == ahc_phase_table[i].phase)
1379                                         break;
1380                         }
1381                         if (lastphase != P_BUSFREE) {
1382                                 /*
1383                                  * Renegotiate with this device at the
1384                                  * next opportunity just in case this busfree
1385                                  * is due to a negotiation mismatch with the
1386                                  * device.
1387                                  */
1388                                 ahc_force_renegotiation(ahc, &devinfo);
1389                         }
1390                         printf("Unexpected busfree %s\n"
1391                                "SEQADDR == 0x%x\n",
1392                                ahc_phase_table[i].phasemsg,
1393                                ahc_inb(ahc, SEQADDR0)
1394                                 | (ahc_inb(ahc, SEQADDR1) << 8));
1395                 }
1396                 ahc_outb(ahc, CLRINT, CLRSCSIINT);
1397                 ahc_restart(ahc);
1398         } else {
1399                 printf("%s: Missing case in ahc_handle_scsiint. status = %x\n",
1400                        ahc_name(ahc), status);
1401                 ahc_outb(ahc, CLRINT, CLRSCSIINT);
1402         }
1403 }
1404
1405 /*
1406  * Force renegotiation to occur the next time we initiate
1407  * a command to the current device.
1408  */
1409 static void
1410 ahc_force_renegotiation(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
1411 {
1412         struct  ahc_initiator_tinfo *targ_info;
1413         struct  ahc_tmode_tstate *tstate;
1414
1415         targ_info = ahc_fetch_transinfo(ahc,
1416                                         devinfo->channel,
1417                                         devinfo->our_scsiid,
1418                                         devinfo->target,
1419                                         &tstate);
1420         ahc_update_neg_request(ahc, devinfo, tstate,
1421                                targ_info, AHC_NEG_IF_NON_ASYNC);
1422 }
1423
1424 #define AHC_MAX_STEPS 2000
1425 void
1426 ahc_clear_critical_section(struct ahc_softc *ahc)
1427 {
1428         int     stepping;
1429         int     steps;
1430         u_int   simode0;
1431         u_int   simode1;
1432
1433         if (ahc->num_critical_sections == 0)
1434                 return;
1435
1436         stepping = FALSE;
1437         steps = 0;
1438         simode0 = 0;
1439         simode1 = 0;
1440         for (;;) {
1441                 struct  cs *cs;
1442                 u_int   seqaddr;
1443                 u_int   i;
1444
1445                 seqaddr = ahc_inb(ahc, SEQADDR0)
1446                         | (ahc_inb(ahc, SEQADDR1) << 8);
1447
1448                 /*
1449                  * Seqaddr represents the next instruction to execute,
1450                  * so we are really executing the instruction just
1451                  * before it.
1452                  */
1453                 cs = ahc->critical_sections;
1454                 for (i = 0; i < ahc->num_critical_sections; i++, cs++) {
1455
1456                         if (cs->begin < seqaddr && cs->end >= seqaddr)
1457                                 break;
1458                 }
1459
1460                 if (i == ahc->num_critical_sections)
1461                         break;
1462
1463                 if (steps > AHC_MAX_STEPS) {
1464                         printf("%s: Infinite loop in critical section\n",
1465                                ahc_name(ahc));
1466                         ahc_dump_card_state(ahc);
1467                         panic("critical section loop");
1468                 }
1469
1470                 steps++;
1471                 if (stepping == FALSE) {
1472
1473                         /*
1474                          * Disable all interrupt sources so that the
1475                          * sequencer will not be stuck by a pausing
1476                          * interrupt condition while we attempt to
1477                          * leave a critical section.
1478                          */
1479                         simode0 = ahc_inb(ahc, SIMODE0);
1480                         ahc_outb(ahc, SIMODE0, 0);
1481                         simode1 = ahc_inb(ahc, SIMODE1);
1482                         if ((ahc->features & AHC_DT) != 0)
1483                                 /*
1484                                  * On DT class controllers, we
1485                                  * use the enhanced busfree logic.
1486                                  * Unfortunately we cannot re-enable
1487                                  * busfree detection within the
1488                                  * current connection, so we must
1489                                  * leave it on while single stepping.
1490                                  */
1491                                 ahc_outb(ahc, SIMODE1, simode1 & ENBUSFREE);
1492                         else
1493                                 ahc_outb(ahc, SIMODE1, 0);
1494                         ahc_outb(ahc, CLRINT, CLRSCSIINT);
1495                         ahc_outb(ahc, SEQCTL, ahc->seqctl | STEP);
1496                         stepping = TRUE;
1497                 }
1498                 if ((ahc->features & AHC_DT) != 0) {
1499                         ahc_outb(ahc, CLRSINT1, CLRBUSFREE);
1500                         ahc_outb(ahc, CLRINT, CLRSCSIINT);
1501                 }
1502                 ahc_outb(ahc, HCNTRL, ahc->unpause);
1503                 while (!ahc_is_paused(ahc))
1504                         aic_delay(200);
1505         }
1506         if (stepping) {
1507                 ahc_outb(ahc, SIMODE0, simode0);
1508                 ahc_outb(ahc, SIMODE1, simode1);
1509                 ahc_outb(ahc, SEQCTL, ahc->seqctl);
1510         }
1511 }
1512
1513 /*
1514  * Clear any pending interrupt status.
1515  */
1516 void
1517 ahc_clear_intstat(struct ahc_softc *ahc)
1518 {
1519         /* Clear any interrupt conditions this may have caused */
1520         ahc_outb(ahc, CLRSINT1, CLRSELTIMEO|CLRATNO|CLRSCSIRSTI
1521                                 |CLRBUSFREE|CLRSCSIPERR|CLRPHASECHG|
1522                                 CLRREQINIT);
1523         ahc_flush_device_writes(ahc);
1524         ahc_outb(ahc, CLRSINT0, CLRSELDO|CLRSELDI|CLRSELINGO);
1525         ahc_flush_device_writes(ahc);
1526         ahc_outb(ahc, CLRINT, CLRSCSIINT);
1527         ahc_flush_device_writes(ahc);
1528 }
1529
1530 /**************************** Debugging Routines ******************************/
1531 #ifdef AHC_DEBUG
1532 uint32_t ahc_debug = AHC_DEBUG_OPTS;
1533 #endif
1534
1535 void
1536 ahc_print_scb(struct scb *scb)
1537 {
1538         int i;
1539
1540         struct hardware_scb *hscb = scb->hscb;
1541
1542         printf("scb:%p control:0x%x scsiid:0x%x lun:%d cdb_len:%d\n",
1543                (void *)scb,
1544                hscb->control,
1545                hscb->scsiid,
1546                hscb->lun,
1547                hscb->cdb_len);
1548         printf("Shared Data: ");
1549         for (i = 0; i < sizeof(hscb->shared_data.cdb); i++)
1550                 printf("%#02x", hscb->shared_data.cdb[i]);
1551         printf("        dataptr:%#x datacnt:%#x sgptr:%#x tag:%#x\n",
1552                 aic_le32toh(hscb->dataptr),
1553                 aic_le32toh(hscb->datacnt),
1554                 aic_le32toh(hscb->sgptr),
1555                 hscb->tag);
1556         if (scb->sg_count > 0) {
1557                 for (i = 0; i < scb->sg_count; i++) {
1558                         printf("sg[%d] - Addr 0x%x%x : Length %d\n",
1559                                i,
1560                                (aic_le32toh(scb->sg_list[i].len) >> 24
1561                                 & SG_HIGH_ADDR_BITS),
1562                                aic_le32toh(scb->sg_list[i].addr),
1563                                aic_le32toh(scb->sg_list[i].len));
1564                 }
1565         }
1566 }
1567
1568 /************************* Transfer Negotiation *******************************/
1569 /*
1570  * Allocate per target mode instance (ID we respond to as a target)
1571  * transfer negotiation data structures.
1572  */
1573 static struct ahc_tmode_tstate *
1574 ahc_alloc_tstate(struct ahc_softc *ahc, u_int scsi_id, char channel)
1575 {
1576         struct ahc_tmode_tstate *master_tstate;
1577         struct ahc_tmode_tstate *tstate;
1578         int i;
1579
1580         master_tstate = ahc->enabled_targets[ahc->our_id];
1581         if (channel == 'B') {
1582                 scsi_id += 8;
1583                 master_tstate = ahc->enabled_targets[ahc->our_id_b + 8];
1584         }
1585         if (ahc->enabled_targets[scsi_id] != NULL
1586          && ahc->enabled_targets[scsi_id] != master_tstate)
1587                 panic("%s: ahc_alloc_tstate - Target already allocated",
1588                       ahc_name(ahc));
1589         tstate = (struct ahc_tmode_tstate*)malloc(sizeof(*tstate),
1590                                                    M_DEVBUF, M_NOWAIT);
1591         if (tstate == NULL)
1592                 return (NULL);
1593
1594         /*
1595          * If we have allocated a master tstate, copy user settings from
1596          * the master tstate (taken from SRAM or the EEPROM) for this
1597          * channel, but reset our current and goal settings to async/narrow
1598          * until an initiator talks to us.
1599          */
1600         if (master_tstate != NULL) {
1601                 memcpy(tstate, master_tstate, sizeof(*tstate));
1602                 memset(tstate->enabled_luns, 0, sizeof(tstate->enabled_luns));
1603                 tstate->ultraenb = 0;
1604                 for (i = 0; i < AHC_NUM_TARGETS; i++) {
1605                         memset(&tstate->transinfo[i].curr, 0,
1606                               sizeof(tstate->transinfo[i].curr));
1607                         memset(&tstate->transinfo[i].goal, 0,
1608                               sizeof(tstate->transinfo[i].goal));
1609                 }
1610         } else
1611                 memset(tstate, 0, sizeof(*tstate));
1612         ahc->enabled_targets[scsi_id] = tstate;
1613         return (tstate);
1614 }
1615
1616 #ifdef AHC_TARGET_MODE
1617 /*
1618  * Free per target mode instance (ID we respond to as a target)
1619  * transfer negotiation data structures.
1620  */
1621 static void
1622 ahc_free_tstate(struct ahc_softc *ahc, u_int scsi_id, char channel, int force)
1623 {
1624         struct ahc_tmode_tstate *tstate;
1625
1626         /*
1627          * Don't clean up our "master" tstate.
1628          * It has our default user settings.
1629          */
1630         if (((channel == 'B' && scsi_id == ahc->our_id_b)
1631           || (channel == 'A' && scsi_id == ahc->our_id))
1632          && force == FALSE)
1633                 return;
1634
1635         if (channel == 'B')
1636                 scsi_id += 8;
1637         tstate = ahc->enabled_targets[scsi_id];
1638         if (tstate != NULL)
1639                 free(tstate, M_DEVBUF);
1640         ahc->enabled_targets[scsi_id] = NULL;
1641 }
1642 #endif
1643
1644 /*
1645  * Called when we have an active connection to a target on the bus,
1646  * this function finds the nearest syncrate to the input period limited
1647  * by the capabilities of the bus connectivity of and sync settings for
1648  * the target.
1649  */
1650 struct ahc_syncrate *
1651 ahc_devlimited_syncrate(struct ahc_softc *ahc,
1652                         struct ahc_initiator_tinfo *tinfo,
1653                         u_int *period, u_int *ppr_options, role_t role)
1654 {
1655         struct  ahc_transinfo *transinfo;
1656         u_int   maxsync;
1657
1658         if ((ahc->features & AHC_ULTRA2) != 0) {
1659                 if ((ahc_inb(ahc, SBLKCTL) & ENAB40) != 0
1660                  && (ahc_inb(ahc, SSTAT2) & EXP_ACTIVE) == 0) {
1661                         maxsync = AHC_SYNCRATE_DT;
1662                 } else {
1663                         maxsync = AHC_SYNCRATE_ULTRA;
1664                         /* Can't do DT on an SE bus */
1665                         *ppr_options &= ~MSG_EXT_PPR_DT_REQ;
1666                 }
1667         } else if ((ahc->features & AHC_ULTRA) != 0) {
1668                 maxsync = AHC_SYNCRATE_ULTRA;
1669         } else {
1670                 maxsync = AHC_SYNCRATE_FAST;
1671         }
1672         /*
1673          * Never allow a value higher than our current goal
1674          * period otherwise we may allow a target initiated
1675          * negotiation to go above the limit as set by the
1676          * user.  In the case of an initiator initiated
1677          * sync negotiation, we limit based on the user
1678          * setting.  This allows the system to still accept
1679          * incoming negotiations even if target initiated
1680          * negotiation is not performed.
1681          */
1682         if (role == ROLE_TARGET)
1683                 transinfo = &tinfo->user;
1684         else
1685                 transinfo = &tinfo->goal;
1686         *ppr_options &= transinfo->ppr_options;
1687         if (transinfo->width == MSG_EXT_WDTR_BUS_8_BIT) {
1688                 maxsync = MAX(maxsync, AHC_SYNCRATE_ULTRA2);
1689                 *ppr_options &= ~MSG_EXT_PPR_DT_REQ;
1690         }
1691         if (transinfo->period == 0) {
1692                 *period = 0;
1693                 *ppr_options = 0;
1694                 return (NULL);
1695         }
1696         *period = MAX(*period, transinfo->period);
1697         return (ahc_find_syncrate(ahc, period, ppr_options, maxsync));
1698 }
1699
1700 /*
1701  * Look up the valid period to SCSIRATE conversion in our table.
1702  * Return the period and offset that should be sent to the target
1703  * if this was the beginning of an SDTR.
1704  */
1705 struct ahc_syncrate *
1706 ahc_find_syncrate(struct ahc_softc *ahc, u_int *period,
1707                   u_int *ppr_options, u_int maxsync)
1708 {
1709         struct ahc_syncrate *syncrate;
1710
1711         if ((ahc->features & AHC_DT) == 0)
1712                 *ppr_options &= ~MSG_EXT_PPR_DT_REQ;
1713
1714         /* Skip all DT only entries if DT is not available */
1715         if ((*ppr_options & MSG_EXT_PPR_DT_REQ) == 0
1716          && maxsync < AHC_SYNCRATE_ULTRA2)
1717                 maxsync = AHC_SYNCRATE_ULTRA2;
1718
1719         for (syncrate = &ahc_syncrates[maxsync];
1720              syncrate->rate != NULL;
1721              syncrate++) {
1722
1723                 /*
1724                  * The Ultra2 table doesn't go as low
1725                  * as for the Fast/Ultra cards.
1726                  */
1727                 if ((ahc->features & AHC_ULTRA2) != 0
1728                  && (syncrate->sxfr_u2 == 0))
1729                         break;
1730
1731                 if (*period <= syncrate->period) {
1732                         /*
1733                          * When responding to a target that requests
1734                          * sync, the requested rate may fall between
1735                          * two rates that we can output, but still be
1736                          * a rate that we can receive.  Because of this,
1737                          * we want to respond to the target with
1738                          * the same rate that it sent to us even
1739                          * if the period we use to send data to it
1740                          * is lower.  Only lower the response period
1741                          * if we must.
1742                          */
1743                         if (syncrate == &ahc_syncrates[maxsync])
1744                                 *period = syncrate->period;
1745
1746                         /*
1747                          * At some speeds, we only support
1748                          * ST transfers.
1749                          */
1750                         if ((syncrate->sxfr_u2 & ST_SXFR) != 0)
1751                                 *ppr_options &= ~MSG_EXT_PPR_DT_REQ;
1752                         break;
1753                 }
1754         }
1755
1756         if ((*period == 0)
1757          || (syncrate->rate == NULL)
1758          || ((ahc->features & AHC_ULTRA2) != 0
1759           && (syncrate->sxfr_u2 == 0))) {
1760                 /* Use asynchronous transfers. */
1761                 *period = 0;
1762                 syncrate = NULL;
1763                 *ppr_options &= ~MSG_EXT_PPR_DT_REQ;
1764         }
1765         return (syncrate);
1766 }
1767
1768 /*
1769  * Convert from an entry in our syncrate table to the SCSI equivalent
1770  * sync "period" factor.
1771  */
1772 u_int
1773 ahc_find_period(struct ahc_softc *ahc, u_int scsirate, u_int maxsync)
1774 {
1775         struct ahc_syncrate *syncrate;
1776
1777         if ((ahc->features & AHC_ULTRA2) != 0)
1778                 scsirate &= SXFR_ULTRA2;
1779         else
1780                 scsirate &= SXFR;
1781
1782         syncrate = &ahc_syncrates[maxsync];
1783         while (syncrate->rate != NULL) {
1784
1785                 if ((ahc->features & AHC_ULTRA2) != 0) {
1786                         if (syncrate->sxfr_u2 == 0)
1787                                 break;
1788                         else if (scsirate == (syncrate->sxfr_u2 & SXFR_ULTRA2))
1789                                 return (syncrate->period);
1790                 } else if (scsirate == (syncrate->sxfr & SXFR)) {
1791                                 return (syncrate->period);
1792                 }
1793                 syncrate++;
1794         }
1795         return (0); /* async */
1796 }
1797
1798 /*
1799  * Truncate the given synchronous offset to a value the
1800  * current adapter type and syncrate are capable of.
1801  */
1802 void
1803 ahc_validate_offset(struct ahc_softc *ahc,
1804                     struct ahc_initiator_tinfo *tinfo,
1805                     struct ahc_syncrate *syncrate,
1806                     u_int *offset, int wide, role_t role)
1807 {
1808         u_int maxoffset;
1809
1810         /* Limit offset to what we can do */
1811         if (syncrate == NULL) {
1812                 maxoffset = 0;
1813         } else if ((ahc->features & AHC_ULTRA2) != 0) {
1814                 maxoffset = MAX_OFFSET_ULTRA2;
1815         } else {
1816                 if (wide)
1817                         maxoffset = MAX_OFFSET_16BIT;
1818                 else
1819                         maxoffset = MAX_OFFSET_8BIT;
1820         }
1821         *offset = MIN(*offset, maxoffset);
1822         if (tinfo != NULL) {
1823                 if (role == ROLE_TARGET)
1824                         *offset = MIN(*offset, tinfo->user.offset);
1825                 else
1826                         *offset = MIN(*offset, tinfo->goal.offset);
1827         }
1828 }
1829
1830 /*
1831  * Truncate the given transfer width parameter to a value the
1832  * current adapter type is capable of.
1833  */
1834 void
1835 ahc_validate_width(struct ahc_softc *ahc, struct ahc_initiator_tinfo *tinfo,
1836                    u_int *bus_width, role_t role)
1837 {
1838         switch (*bus_width) {
1839         default:
1840                 if (ahc->features & AHC_WIDE) {
1841                         /* Respond Wide */
1842                         *bus_width = MSG_EXT_WDTR_BUS_16_BIT;
1843                         break;
1844                 }
1845                 /* FALLTHROUGH */
1846         case MSG_EXT_WDTR_BUS_8_BIT:
1847                 *bus_width = MSG_EXT_WDTR_BUS_8_BIT;
1848                 break;
1849         }
1850         if (tinfo != NULL) {
1851                 if (role == ROLE_TARGET)
1852                         *bus_width = MIN(tinfo->user.width, *bus_width);
1853                 else
1854                         *bus_width = MIN(tinfo->goal.width, *bus_width);
1855         }
1856 }
1857
1858 /*
1859  * Update the bitmask of targets for which the controller should
1860  * negotiate with at the next convenient opportunity.  This currently
1861  * means the next time we send the initial identify messages for
1862  * a new transaction.
1863  */
1864 int
1865 ahc_update_neg_request(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
1866                        struct ahc_tmode_tstate *tstate,
1867                        struct ahc_initiator_tinfo *tinfo, ahc_neg_type neg_type)
1868 {
1869         u_int auto_negotiate_orig;
1870
1871         auto_negotiate_orig = tstate->auto_negotiate;
1872         if (neg_type == AHC_NEG_ALWAYS) {
1873                 /*
1874                  * Force our "current" settings to be
1875                  * unknown so that unless a bus reset
1876                  * occurs the need to renegotiate is
1877                  * recorded persistently.
1878                  */
1879                 if ((ahc->features & AHC_WIDE) != 0)
1880                         tinfo->curr.width = AHC_WIDTH_UNKNOWN;
1881                 tinfo->curr.period = AHC_PERIOD_UNKNOWN;
1882                 tinfo->curr.offset = AHC_OFFSET_UNKNOWN;
1883         }
1884         if (tinfo->curr.period != tinfo->goal.period
1885          || tinfo->curr.width != tinfo->goal.width
1886          || tinfo->curr.offset != tinfo->goal.offset
1887          || tinfo->curr.ppr_options != tinfo->goal.ppr_options
1888          || (neg_type == AHC_NEG_IF_NON_ASYNC
1889           && (tinfo->goal.offset != 0
1890            || tinfo->goal.width != MSG_EXT_WDTR_BUS_8_BIT
1891            || tinfo->goal.ppr_options != 0)))
1892                 tstate->auto_negotiate |= devinfo->target_mask;
1893         else
1894                 tstate->auto_negotiate &= ~devinfo->target_mask;
1895
1896         return (auto_negotiate_orig != tstate->auto_negotiate);
1897 }
1898
1899 /*
1900  * Update the user/goal/curr tables of synchronous negotiation
1901  * parameters as well as, in the case of a current or active update,
1902  * any data structures on the host controller.  In the case of an
1903  * active update, the specified target is currently talking to us on
1904  * the bus, so the transfer parameter update must take effect
1905  * immediately.
1906  */
1907 void
1908 ahc_set_syncrate(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
1909                  struct ahc_syncrate *syncrate, u_int period,
1910                  u_int offset, u_int ppr_options, u_int type, int paused)
1911 {
1912         struct  ahc_initiator_tinfo *tinfo;
1913         struct  ahc_tmode_tstate *tstate;
1914         u_int   old_period;
1915         u_int   old_offset;
1916         u_int   old_ppr;
1917         int     active;
1918         int     update_needed;
1919
1920         active = (type & AHC_TRANS_ACTIVE) == AHC_TRANS_ACTIVE;
1921         update_needed = 0;
1922
1923         if (syncrate == NULL) {
1924                 period = 0;
1925                 offset = 0;
1926         }
1927
1928         tinfo = ahc_fetch_transinfo(ahc, devinfo->channel, devinfo->our_scsiid,
1929                                     devinfo->target, &tstate);
1930
1931         if ((type & AHC_TRANS_USER) != 0) {
1932                 tinfo->user.period = period;
1933                 tinfo->user.offset = offset;
1934                 tinfo->user.ppr_options = ppr_options;
1935         }
1936
1937         if ((type & AHC_TRANS_GOAL) != 0) {
1938                 tinfo->goal.period = period;
1939                 tinfo->goal.offset = offset;
1940                 tinfo->goal.ppr_options = ppr_options;
1941         }
1942
1943         old_period = tinfo->curr.period;
1944         old_offset = tinfo->curr.offset;
1945         old_ppr    = tinfo->curr.ppr_options;
1946
1947         if ((type & AHC_TRANS_CUR) != 0
1948          && (old_period != period
1949           || old_offset != offset
1950           || old_ppr != ppr_options)) {
1951                 u_int   scsirate;
1952
1953                 update_needed++;
1954                 scsirate = tinfo->scsirate;
1955                 if ((ahc->features & AHC_ULTRA2) != 0) {
1956
1957                         scsirate &= ~(SXFR_ULTRA2|SINGLE_EDGE|ENABLE_CRC);
1958                         if (syncrate != NULL) {
1959                                 scsirate |= syncrate->sxfr_u2;
1960                                 if ((ppr_options & MSG_EXT_PPR_DT_REQ) != 0)
1961                                         scsirate |= ENABLE_CRC;
1962                                 else
1963                                         scsirate |= SINGLE_EDGE;
1964                         }
1965                 } else {
1966
1967                         scsirate &= ~(SXFR|SOFS);
1968                         /*
1969                          * Ensure Ultra mode is set properly for
1970                          * this target.
1971                          */
1972                         tstate->ultraenb &= ~devinfo->target_mask;
1973                         if (syncrate != NULL) {
1974                                 if (syncrate->sxfr & ULTRA_SXFR) {
1975                                         tstate->ultraenb |=
1976                                                 devinfo->target_mask;
1977                                 }
1978                                 scsirate |= syncrate->sxfr & SXFR;
1979                                 scsirate |= offset & SOFS;
1980                         }
1981                         if (active) {
1982                                 u_int sxfrctl0;
1983
1984                                 sxfrctl0 = ahc_inb(ahc, SXFRCTL0);
1985                                 sxfrctl0 &= ~FAST20;
1986                                 if (tstate->ultraenb & devinfo->target_mask)
1987                                         sxfrctl0 |= FAST20;
1988                                 ahc_outb(ahc, SXFRCTL0, sxfrctl0);
1989                         }
1990                 }
1991                 if (active) {
1992                         ahc_outb(ahc, SCSIRATE, scsirate);
1993                         if ((ahc->features & AHC_ULTRA2) != 0)
1994                                 ahc_outb(ahc, SCSIOFFSET, offset);
1995                 }
1996
1997                 tinfo->scsirate = scsirate;
1998                 tinfo->curr.period = period;
1999                 tinfo->curr.offset = offset;
2000                 tinfo->curr.ppr_options = ppr_options;
2001
2002                 ahc_send_async(ahc, devinfo->channel, devinfo->target,
2003                                CAM_LUN_WILDCARD, AC_TRANSFER_NEG, NULL);
2004                 if (bootverbose) {
2005                         if (offset != 0) {
2006                                 printf("%s: target %d synchronous at %sMHz%s, "
2007                                        "offset = 0x%x\n", ahc_name(ahc),
2008                                        devinfo->target, syncrate->rate,
2009                                        (ppr_options & MSG_EXT_PPR_DT_REQ)
2010                                        ? " DT" : "", offset);
2011                         } else {
2012                                 printf("%s: target %d using "
2013                                        "asynchronous transfers\n",
2014                                        ahc_name(ahc), devinfo->target);
2015                         }
2016                 }
2017         }
2018
2019         update_needed += ahc_update_neg_request(ahc, devinfo, tstate,
2020                                                 tinfo, AHC_NEG_TO_GOAL);
2021
2022         if (update_needed)
2023                 ahc_update_pending_scbs(ahc);
2024 }
2025
2026 /*
2027  * Update the user/goal/curr tables of wide negotiation
2028  * parameters as well as, in the case of a current or active update,
2029  * any data structures on the host controller.  In the case of an
2030  * active update, the specified target is currently talking to us on
2031  * the bus, so the transfer parameter update must take effect
2032  * immediately.
2033  */
2034 void
2035 ahc_set_width(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
2036               u_int width, u_int type, int paused)
2037 {
2038         struct  ahc_initiator_tinfo *tinfo;
2039         struct  ahc_tmode_tstate *tstate;
2040         u_int   oldwidth;
2041         int     active;
2042         int     update_needed;
2043
2044         active = (type & AHC_TRANS_ACTIVE) == AHC_TRANS_ACTIVE;
2045         update_needed = 0;
2046         tinfo = ahc_fetch_transinfo(ahc, devinfo->channel, devinfo->our_scsiid,
2047                                     devinfo->target, &tstate);
2048
2049         if ((type & AHC_TRANS_USER) != 0)
2050                 tinfo->user.width = width;
2051
2052         if ((type & AHC_TRANS_GOAL) != 0)
2053                 tinfo->goal.width = width;
2054
2055         oldwidth = tinfo->curr.width;
2056         if ((type & AHC_TRANS_CUR) != 0 && oldwidth != width) {
2057                 u_int   scsirate;
2058
2059                 update_needed++;
2060                 scsirate =  tinfo->scsirate;
2061                 scsirate &= ~WIDEXFER;
2062                 if (width == MSG_EXT_WDTR_BUS_16_BIT)
2063                         scsirate |= WIDEXFER;
2064
2065                 tinfo->scsirate = scsirate;
2066
2067                 if (active)
2068                         ahc_outb(ahc, SCSIRATE, scsirate);
2069
2070                 tinfo->curr.width = width;
2071
2072                 ahc_send_async(ahc, devinfo->channel, devinfo->target,
2073                                CAM_LUN_WILDCARD, AC_TRANSFER_NEG, NULL);
2074                 if (bootverbose) {
2075                         printf("%s: target %d using %dbit transfers\n",
2076                                ahc_name(ahc), devinfo->target,
2077                                8 * (0x01 << width));
2078                 }
2079         }
2080
2081         update_needed += ahc_update_neg_request(ahc, devinfo, tstate,
2082                                                 tinfo, AHC_NEG_TO_GOAL);
2083         if (update_needed)
2084                 ahc_update_pending_scbs(ahc);
2085 }
2086
2087 /*
2088  * Update the current state of tagged queuing for a given target.
2089  */
2090 void
2091 ahc_set_tags(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
2092              ahc_queue_alg alg)
2093 {
2094         ahc_platform_set_tags(ahc, devinfo, alg);
2095         ahc_send_async(ahc, devinfo->channel, devinfo->target,
2096                        devinfo->lun, AC_TRANSFER_NEG, &alg);
2097 }
2098
2099 /*
2100  * When the transfer settings for a connection change, update any
2101  * in-transit SCBs to contain the new data so the hardware will
2102  * be set correctly during future (re)selections.
2103  */
2104 static void
2105 ahc_update_pending_scbs(struct ahc_softc *ahc)
2106 {
2107         struct  scb *pending_scb;
2108         int     pending_scb_count;
2109         int     i;
2110         int     paused;
2111         u_int   saved_scbptr;
2112
2113         /*
2114          * Traverse the pending SCB list and ensure that all of the
2115          * SCBs there have the proper settings.
2116          */
2117         pending_scb_count = 0;
2118         LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2119                 struct ahc_devinfo devinfo;
2120                 struct hardware_scb *pending_hscb;
2121                 struct ahc_initiator_tinfo *tinfo;
2122                 struct ahc_tmode_tstate *tstate;
2123
2124                 ahc_scb_devinfo(ahc, &devinfo, pending_scb);
2125                 tinfo = ahc_fetch_transinfo(ahc, devinfo.channel,
2126                                             devinfo.our_scsiid,
2127                                             devinfo.target, &tstate);
2128                 pending_hscb = pending_scb->hscb;
2129                 pending_hscb->control &= ~ULTRAENB;
2130                 if ((tstate->ultraenb & devinfo.target_mask) != 0)
2131                         pending_hscb->control |= ULTRAENB;
2132                 pending_hscb->scsirate = tinfo->scsirate;
2133                 pending_hscb->scsioffset = tinfo->curr.offset;
2134                 if ((tstate->auto_negotiate & devinfo.target_mask) == 0
2135                  && (pending_scb->flags & SCB_AUTO_NEGOTIATE) != 0) {
2136                         pending_scb->flags &= ~SCB_AUTO_NEGOTIATE;
2137                         pending_hscb->control &= ~MK_MESSAGE;
2138                 }
2139                 ahc_sync_scb(ahc, pending_scb,
2140                              BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
2141                 pending_scb_count++;
2142         }
2143
2144         if (pending_scb_count == 0)
2145                 return;
2146
2147         if (ahc_is_paused(ahc)) {
2148                 paused = 1;
2149         } else {
2150                 paused = 0;
2151                 ahc_pause(ahc);
2152         }
2153
2154         saved_scbptr = ahc_inb(ahc, SCBPTR);
2155         /* Ensure that the hscbs down on the card match the new information */
2156         for (i = 0; i < ahc->scb_data->maxhscbs; i++) {
2157                 struct  hardware_scb *pending_hscb;
2158                 u_int   control;
2159                 u_int   scb_tag;
2160
2161                 ahc_outb(ahc, SCBPTR, i);
2162                 scb_tag = ahc_inb(ahc, SCB_TAG);
2163                 pending_scb = ahc_lookup_scb(ahc, scb_tag);
2164                 if (pending_scb == NULL)
2165                         continue;
2166
2167                 pending_hscb = pending_scb->hscb;
2168                 control = ahc_inb(ahc, SCB_CONTROL);
2169                 control &= ~(ULTRAENB|MK_MESSAGE);
2170                 control |= pending_hscb->control & (ULTRAENB|MK_MESSAGE);
2171                 ahc_outb(ahc, SCB_CONTROL, control);
2172                 ahc_outb(ahc, SCB_SCSIRATE, pending_hscb->scsirate);
2173                 ahc_outb(ahc, SCB_SCSIOFFSET, pending_hscb->scsioffset);
2174         }
2175         ahc_outb(ahc, SCBPTR, saved_scbptr);
2176
2177         if (paused == 0)
2178                 ahc_unpause(ahc);
2179 }
2180
2181 /**************************** Pathing Information *****************************/
2182 static void
2183 ahc_fetch_devinfo(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
2184 {
2185         u_int   saved_scsiid;
2186         role_t  role;
2187         int     our_id;
2188
2189         if (ahc_inb(ahc, SSTAT0) & TARGET)
2190                 role = ROLE_TARGET;
2191         else
2192                 role = ROLE_INITIATOR;
2193
2194         if (role == ROLE_TARGET
2195          && (ahc->features & AHC_MULTI_TID) != 0
2196          && (ahc_inb(ahc, SEQ_FLAGS)
2197            & (CMDPHASE_PENDING|TARG_CMD_PENDING|NO_DISCONNECT)) != 0) {
2198                 /* We were selected, so pull our id from TARGIDIN */
2199                 our_id = ahc_inb(ahc, TARGIDIN) & OID;
2200         } else if ((ahc->features & AHC_ULTRA2) != 0)
2201                 our_id = ahc_inb(ahc, SCSIID_ULTRA2) & OID;
2202         else
2203                 our_id = ahc_inb(ahc, SCSIID) & OID;
2204
2205         saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
2206         ahc_compile_devinfo(devinfo,
2207                             our_id,
2208                             SCSIID_TARGET(ahc, saved_scsiid),
2209                             ahc_inb(ahc, SAVED_LUN),
2210                             SCSIID_CHANNEL(ahc, saved_scsiid),
2211                             role);
2212 }
2213
2214 struct ahc_phase_table_entry*
2215 ahc_lookup_phase_entry(int phase)
2216 {
2217         struct ahc_phase_table_entry *entry;
2218         struct ahc_phase_table_entry *last_entry;
2219
2220         /*
2221          * num_phases doesn't include the default entry which
2222          * will be returned if the phase doesn't match.
2223          */
2224         last_entry = &ahc_phase_table[num_phases];
2225         for (entry = ahc_phase_table; entry < last_entry; entry++) {
2226                 if (phase == entry->phase)
2227                         break;
2228         }
2229         return (entry);
2230 }
2231
2232 void
2233 ahc_compile_devinfo(struct ahc_devinfo *devinfo, u_int our_id, u_int target,
2234                     u_int lun, char channel, role_t role)
2235 {
2236         devinfo->our_scsiid = our_id;
2237         devinfo->target = target;
2238         devinfo->lun = lun;
2239         devinfo->target_offset = target;
2240         devinfo->channel = channel;
2241         devinfo->role = role;
2242         if (channel == 'B')
2243                 devinfo->target_offset += 8;
2244         devinfo->target_mask = (0x01 << devinfo->target_offset);
2245 }
2246
2247 void
2248 ahc_print_devinfo(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
2249 {
2250         printf("%s:%c:%d:%d: ", ahc_name(ahc), devinfo->channel,
2251                devinfo->target, devinfo->lun);
2252 }
2253
2254 static void
2255 ahc_scb_devinfo(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
2256                 struct scb *scb)
2257 {
2258         role_t  role;
2259         int     our_id;
2260
2261         our_id = SCSIID_OUR_ID(scb->hscb->scsiid);
2262         role = ROLE_INITIATOR;
2263         if ((scb->flags & SCB_TARGET_SCB) != 0)
2264                 role = ROLE_TARGET;
2265         ahc_compile_devinfo(devinfo, our_id, SCB_GET_TARGET(ahc, scb),
2266                             SCB_GET_LUN(scb), SCB_GET_CHANNEL(ahc, scb), role);
2267 }
2268
2269
2270 /************************ Message Phase Processing ****************************/
2271 static void
2272 ahc_assert_atn(struct ahc_softc *ahc)
2273 {
2274         u_int scsisigo;
2275
2276         scsisigo = ATNO;
2277         if ((ahc->features & AHC_DT) == 0)
2278                 scsisigo |= ahc_inb(ahc, SCSISIGI);
2279         ahc_outb(ahc, SCSISIGO, scsisigo);
2280 }
2281
2282 /*
2283  * When an initiator transaction with the MK_MESSAGE flag either reconnects
2284  * or enters the initial message out phase, we are interrupted.  Fill our
2285  * outgoing message buffer with the appropriate message and beging handing
2286  * the message phase(s) manually.
2287  */
2288 static void
2289 ahc_setup_initiator_msgout(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
2290                            struct scb *scb)
2291 {
2292         /*
2293          * To facilitate adding multiple messages together,
2294          * each routine should increment the index and len
2295          * variables instead of setting them explicitly.
2296          */
2297         ahc->msgout_index = 0;
2298         ahc->msgout_len = 0;
2299
2300         if ((scb->flags & SCB_DEVICE_RESET) == 0
2301          && ahc_inb(ahc, MSG_OUT) == MSG_IDENTIFYFLAG) {
2302                 u_int identify_msg;
2303
2304                 identify_msg = MSG_IDENTIFYFLAG | SCB_GET_LUN(scb);
2305                 if ((scb->hscb->control & DISCENB) != 0)
2306                         identify_msg |= MSG_IDENTIFY_DISCFLAG;
2307                 ahc->msgout_buf[ahc->msgout_index++] = identify_msg;
2308                 ahc->msgout_len++;
2309
2310                 if ((scb->hscb->control & TAG_ENB) != 0) {
2311                         ahc->msgout_buf[ahc->msgout_index++] =
2312                             scb->hscb->control & (TAG_ENB|SCB_TAG_TYPE);
2313                         ahc->msgout_buf[ahc->msgout_index++] = scb->hscb->tag;
2314                         ahc->msgout_len += 2;
2315                 }
2316         }
2317
2318         if (scb->flags & SCB_DEVICE_RESET) {
2319                 ahc->msgout_buf[ahc->msgout_index++] = MSG_BUS_DEV_RESET;
2320                 ahc->msgout_len++;
2321                 ahc_print_path(ahc, scb);
2322                 printf("Bus Device Reset Message Sent\n");
2323                 /*
2324                  * Clear our selection hardware in advance of
2325                  * the busfree.  We may have an entry in the waiting
2326                  * Q for this target, and we don't want to go about
2327                  * selecting while we handle the busfree and blow it
2328                  * away.
2329                  */
2330                 ahc_outb(ahc, SCSISEQ, (ahc_inb(ahc, SCSISEQ) & ~ENSELO));
2331         } else if ((scb->flags & SCB_ABORT) != 0) {
2332                 if ((scb->hscb->control & TAG_ENB) != 0)
2333                         ahc->msgout_buf[ahc->msgout_index++] = MSG_ABORT_TAG;
2334                 else
2335                         ahc->msgout_buf[ahc->msgout_index++] = MSG_ABORT;
2336                 ahc->msgout_len++;
2337                 ahc_print_path(ahc, scb);
2338                 printf("Abort%s Message Sent\n",
2339                        (scb->hscb->control & TAG_ENB) != 0 ? " Tag" : "");
2340                 /*
2341                  * Clear our selection hardware in advance of
2342                  * the busfree.  We may have an entry in the waiting
2343                  * Q for this target, and we don't want to go about
2344                  * selecting while we handle the busfree and blow it
2345                  * away.
2346                  */
2347                 ahc_outb(ahc, SCSISEQ, (ahc_inb(ahc, SCSISEQ) & ~ENSELO));
2348         } else if ((scb->flags & (SCB_AUTO_NEGOTIATE|SCB_NEGOTIATE)) != 0) {
2349                 ahc_build_transfer_msg(ahc, devinfo);
2350         } else {
2351                 printf("ahc_intr: AWAITING_MSG for an SCB that "
2352                        "does not have a waiting message\n");
2353                 printf("SCSIID = %x, target_mask = %x\n", scb->hscb->scsiid,
2354                        devinfo->target_mask);
2355                 panic("SCB = %d, SCB Control = %x, MSG_OUT = %x "
2356                       "SCB flags = %x", scb->hscb->tag, scb->hscb->control,
2357                       ahc_inb(ahc, MSG_OUT), scb->flags);
2358         }
2359
2360         /*
2361          * Clear the MK_MESSAGE flag from the SCB so we aren't
2362          * asked to send this message again.
2363          */
2364         ahc_outb(ahc, SCB_CONTROL, ahc_inb(ahc, SCB_CONTROL) & ~MK_MESSAGE);
2365         scb->hscb->control &= ~MK_MESSAGE;
2366         ahc->msgout_index = 0;
2367         ahc->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
2368 }
2369
2370 /*
2371  * Build an appropriate transfer negotiation message for the
2372  * currently active target.
2373  */
2374 static void
2375 ahc_build_transfer_msg(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
2376 {
2377         /*
2378          * We need to initiate transfer negotiations.
2379          * If our current and goal settings are identical,
2380          * we want to renegotiate due to a check condition.
2381          */
2382         struct  ahc_initiator_tinfo *tinfo;
2383         struct  ahc_tmode_tstate *tstate;
2384         struct  ahc_syncrate *rate;
2385         int     dowide;
2386         int     dosync;
2387         int     doppr;
2388         u_int   period;
2389         u_int   ppr_options;
2390         u_int   offset;
2391
2392         tinfo = ahc_fetch_transinfo(ahc, devinfo->channel, devinfo->our_scsiid,
2393                                     devinfo->target, &tstate);
2394         /*
2395          * Filter our period based on the current connection.
2396          * If we can't perform DT transfers on this segment (not in LVD
2397          * mode for instance), then our decision to issue a PPR message
2398          * may change.
2399          */
2400         period = tinfo->goal.period;
2401         offset = tinfo->goal.offset;
2402         ppr_options = tinfo->goal.ppr_options;
2403         /* Target initiated PPR is not allowed in the SCSI spec */
2404         if (devinfo->role == ROLE_TARGET)
2405                 ppr_options = 0;
2406         rate = ahc_devlimited_syncrate(ahc, tinfo, &period,
2407                                        &ppr_options, devinfo->role);
2408         dowide = tinfo->curr.width != tinfo->goal.width;
2409         dosync = tinfo->curr.offset != offset || tinfo->curr.period != period;
2410         /*
2411          * Only use PPR if we have options that need it, even if the device
2412          * claims to support it.  There might be an expander in the way
2413          * that doesn't.
2414          */
2415         doppr = ppr_options != 0;
2416
2417         if (!dowide && !dosync && !doppr) {
2418                 dowide = tinfo->goal.width != MSG_EXT_WDTR_BUS_8_BIT;
2419                 dosync = tinfo->goal.offset != 0;
2420         }
2421
2422         if (!dowide && !dosync && !doppr) {
2423                 /*
2424                  * Force async with a WDTR message if we have a wide bus,
2425                  * or just issue an SDTR with a 0 offset.
2426                  */
2427                 if ((ahc->features & AHC_WIDE) != 0)
2428                         dowide = 1;
2429                 else
2430                         dosync = 1;
2431
2432                 if (bootverbose) {
2433                         ahc_print_devinfo(ahc, devinfo);
2434                         printf("Ensuring async\n");
2435                 }
2436         }
2437
2438         /* Target initiated PPR is not allowed in the SCSI spec */
2439         if (devinfo->role == ROLE_TARGET)
2440                 doppr = 0;
2441
2442         /*
2443          * Both the PPR message and SDTR message require the
2444          * goal syncrate to be limited to what the target device
2445          * is capable of handling (based on whether an LVD->SE
2446          * expander is on the bus), so combine these two cases.
2447          * Regardless, guarantee that if we are using WDTR and SDTR
2448          * messages that WDTR comes first.
2449          */
2450         if (doppr || (dosync && !dowide)) {
2451
2452                 offset = tinfo->goal.offset;
2453                 ahc_validate_offset(ahc, tinfo, rate, &offset,
2454                                     doppr ? tinfo->goal.width
2455                                           : tinfo->curr.width,
2456                                     devinfo->role);
2457                 if (doppr) {
2458                         ahc_construct_ppr(ahc, devinfo, period, offset,
2459                                           tinfo->goal.width, ppr_options);
2460                 } else {
2461                         ahc_construct_sdtr(ahc, devinfo, period, offset);
2462                 }
2463         } else {
2464                 ahc_construct_wdtr(ahc, devinfo, tinfo->goal.width);
2465         }
2466 }
2467
2468 /*
2469  * Build a synchronous negotiation message in our message
2470  * buffer based on the input parameters.
2471  */
2472 static void
2473 ahc_construct_sdtr(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
2474                    u_int period, u_int offset)
2475 {
2476         if (offset == 0)
2477                 period = AHC_ASYNC_XFER_PERIOD;
2478         ahc->msgout_buf[ahc->msgout_index++] = MSG_EXTENDED;
2479         ahc->msgout_buf[ahc->msgout_index++] = MSG_EXT_SDTR_LEN;
2480         ahc->msgout_buf[ahc->msgout_index++] = MSG_EXT_SDTR;
2481         ahc->msgout_buf[ahc->msgout_index++] = period;
2482         ahc->msgout_buf[ahc->msgout_index++] = offset;
2483         ahc->msgout_len += 5;
2484         if (bootverbose) {
2485                 printf("(%s:%c:%d:%d): Sending SDTR period %x, offset %x\n",
2486                        ahc_name(ahc), devinfo->channel, devinfo->target,
2487                        devinfo->lun, period, offset);
2488         }
2489 }
2490
2491 /*
2492  * Build a wide negotiation message in our message
2493  * buffer based on the input parameters.
2494  */
2495 static void
2496 ahc_construct_wdtr(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
2497                    u_int bus_width)
2498 {
2499         ahc->msgout_buf[ahc->msgout_index++] = MSG_EXTENDED;
2500         ahc->msgout_buf[ahc->msgout_index++] = MSG_EXT_WDTR_LEN;
2501         ahc->msgout_buf[ahc->msgout_index++] = MSG_EXT_WDTR;
2502         ahc->msgout_buf[ahc->msgout_index++] = bus_width;
2503         ahc->msgout_len += 4;
2504         if (bootverbose) {
2505                 printf("(%s:%c:%d:%d): Sending WDTR %x\n",
2506                        ahc_name(ahc), devinfo->channel, devinfo->target,
2507                        devinfo->lun, bus_width);
2508         }
2509 }
2510
2511 /*
2512  * Build a parallel protocol request message in our message
2513  * buffer based on the input parameters.
2514  */
2515 static void
2516 ahc_construct_ppr(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
2517                   u_int period, u_int offset, u_int bus_width,
2518                   u_int ppr_options)
2519 {
2520         if (offset == 0)
2521                 period = AHC_ASYNC_XFER_PERIOD;
2522         ahc->msgout_buf[ahc->msgout_index++] = MSG_EXTENDED;
2523         ahc->msgout_buf[ahc->msgout_index++] = MSG_EXT_PPR_LEN;
2524         ahc->msgout_buf[ahc->msgout_index++] = MSG_EXT_PPR;
2525         ahc->msgout_buf[ahc->msgout_index++] = period;
2526         ahc->msgout_buf[ahc->msgout_index++] = 0;
2527         ahc->msgout_buf[ahc->msgout_index++] = offset;
2528         ahc->msgout_buf[ahc->msgout_index++] = bus_width;
2529         ahc->msgout_buf[ahc->msgout_index++] = ppr_options;
2530         ahc->msgout_len += 8;
2531         if (bootverbose) {
2532                 printf("(%s:%c:%d:%d): Sending PPR bus_width %x, period %x, "
2533                        "offset %x, ppr_options %x\n", ahc_name(ahc),
2534                        devinfo->channel, devinfo->target, devinfo->lun,
2535                        bus_width, period, offset, ppr_options);
2536         }
2537 }
2538
2539 /*
2540  * Clear any active message state.
2541  */
2542 static void
2543 ahc_clear_msg_state(struct ahc_softc *ahc)
2544 {
2545         ahc->msgout_len = 0;
2546         ahc->msgin_index = 0;
2547         ahc->msg_type = MSG_TYPE_NONE;
2548         if ((ahc_inb(ahc, SCSISIGI) & ATNI) != 0) {
2549                 /*
2550                  * The target didn't care to respond to our
2551                  * message request, so clear ATN.
2552                  */
2553                 ahc_outb(ahc, CLRSINT1, CLRATNO);
2554         }
2555         ahc_outb(ahc, MSG_OUT, MSG_NOOP);
2556         ahc_outb(ahc, SEQ_FLAGS2,
2557                  ahc_inb(ahc, SEQ_FLAGS2) & ~TARGET_MSG_PENDING);
2558 }
2559
2560 static void
2561 ahc_handle_proto_violation(struct ahc_softc *ahc)
2562 {
2563         struct  ahc_devinfo devinfo;
2564         struct  scb *scb;
2565         u_int   scbid;
2566         u_int   seq_flags;
2567         u_int   curphase;
2568         u_int   lastphase;
2569         int     found;
2570
2571         ahc_fetch_devinfo(ahc, &devinfo);
2572         scbid = ahc_inb(ahc, SCB_TAG);
2573         scb = ahc_lookup_scb(ahc, scbid);
2574         seq_flags = ahc_inb(ahc, SEQ_FLAGS);
2575         curphase = ahc_inb(ahc, SCSISIGI) & PHASE_MASK;
2576         lastphase = ahc_inb(ahc, LASTPHASE);
2577         if ((seq_flags & NOT_IDENTIFIED) != 0) {
2578
2579                 /*
2580                  * The reconnecting target either did not send an
2581                  * identify message, or did, but we didn't find an SCB
2582                  * to match.
2583                  */
2584                 ahc_print_devinfo(ahc, &devinfo);
2585                 printf("Target did not send an IDENTIFY message. "
2586                        "LASTPHASE = 0x%x.\n", lastphase);
2587                 scb = NULL;
2588         } else if (scb == NULL) {
2589                 /*
2590                  * We don't seem to have an SCB active for this
2591                  * transaction.  Print an error and reset the bus.
2592                  */
2593                 ahc_print_devinfo(ahc, &devinfo);
2594                 printf("No SCB found during protocol violation\n");
2595                 goto proto_violation_reset;
2596         } else {
2597                 aic_set_transaction_status(scb, CAM_SEQUENCE_FAIL);
2598                 if ((seq_flags & NO_CDB_SENT) != 0) {
2599                         ahc_print_path(ahc, scb);
2600                         printf("No or incomplete CDB sent to device.\n");
2601                 } else if ((ahc_inb(ahc, SCB_CONTROL) & STATUS_RCVD) == 0) {
2602                         /*
2603                          * The target never bothered to provide status to
2604                          * us prior to completing the command.  Since we don't
2605                          * know the disposition of this command, we must attempt
2606                          * to abort it.  Assert ATN and prepare to send an abort
2607                          * message.
2608                          */
2609                         ahc_print_path(ahc, scb);
2610                         printf("Completed command without status.\n");
2611                 } else {
2612                         ahc_print_path(ahc, scb);
2613                         printf("Unknown protocol violation.\n");
2614                         ahc_dump_card_state(ahc);
2615                 }
2616         }
2617         if ((lastphase & ~P_DATAIN_DT) == 0
2618          || lastphase == P_COMMAND) {
2619 proto_violation_reset:
2620                 /*
2621                  * Target either went directly to data/command
2622                  * phase or didn't respond to our ATN.
2623                  * The only safe thing to do is to blow
2624                  * it away with a bus reset.
2625                  */
2626                 found = ahc_reset_channel(ahc, 'A', TRUE);
2627                 printf("%s: Issued Channel %c Bus Reset. "
2628                        "%d SCBs aborted\n", ahc_name(ahc), 'A', found);
2629         } else {
2630                 /*
2631                  * Leave the selection hardware off in case
2632                  * this abort attempt will affect yet to
2633                  * be sent commands.
2634                  */
2635                 ahc_outb(ahc, SCSISEQ,
2636                          ahc_inb(ahc, SCSISEQ) & ~ENSELO);
2637                 ahc_assert_atn(ahc);
2638                 ahc_outb(ahc, MSG_OUT, HOST_MSG);
2639                 if (scb == NULL) {
2640                         ahc_print_devinfo(ahc, &devinfo);
2641                         ahc->msgout_buf[0] = MSG_ABORT_TASK;
2642                         ahc->msgout_len = 1;
2643                         ahc->msgout_index = 0;
2644                         ahc->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
2645                 } else {
2646                         ahc_print_path(ahc, scb);
2647                         scb->flags |= SCB_ABORT;
2648                 }
2649                 printf("Protocol violation %s.  Attempting to abort.\n",
2650                        ahc_lookup_phase_entry(curphase)->phasemsg);
2651         }
2652 }
2653
2654 /*
2655  * Manual message loop handler.
2656  */
2657 static void
2658 ahc_handle_message_phase(struct ahc_softc *ahc)
2659 {
2660         struct  ahc_devinfo devinfo;
2661         u_int   bus_phase;
2662         int     end_session;
2663
2664         ahc_fetch_devinfo(ahc, &devinfo);
2665         end_session = FALSE;
2666         bus_phase = ahc_inb(ahc, SCSISIGI) & PHASE_MASK;
2667
2668 reswitch:
2669         switch (ahc->msg_type) {
2670         case MSG_TYPE_INITIATOR_MSGOUT:
2671         {
2672                 int lastbyte;
2673                 int phasemis;
2674                 int msgdone;
2675
2676                 if (ahc->msgout_len == 0)
2677                         panic("HOST_MSG_LOOP interrupt with no active message");
2678
2679 #ifdef AHC_DEBUG
2680                 if ((ahc_debug & AHC_SHOW_MESSAGES) != 0) {
2681                         ahc_print_devinfo(ahc, &devinfo);
2682                         printf("INITIATOR_MSG_OUT");
2683                 }
2684 #endif
2685                 phasemis = bus_phase != P_MESGOUT;
2686                 if (phasemis) {
2687 #ifdef AHC_DEBUG
2688                         if ((ahc_debug & AHC_SHOW_MESSAGES) != 0) {
2689                                 printf(" PHASEMIS %s\n",
2690                                        ahc_lookup_phase_entry(bus_phase)
2691                                                              ->phasemsg);
2692                         }
2693 #endif
2694                         if (bus_phase == P_MESGIN) {
2695                                 /*
2696                                  * Change gears and see if
2697                                  * this messages is of interest to
2698                                  * us or should be passed back to
2699                                  * the sequencer.
2700                                  */
2701                                 ahc_outb(ahc, CLRSINT1, CLRATNO);
2702                                 ahc->send_msg_perror = FALSE;
2703                                 ahc->msg_type = MSG_TYPE_INITIATOR_MSGIN;
2704                                 ahc->msgin_index = 0;
2705                                 goto reswitch;
2706                         }
2707                         end_session = TRUE;
2708                         break;
2709                 }
2710
2711                 if (ahc->send_msg_perror) {
2712                         ahc_outb(ahc, CLRSINT1, CLRATNO);
2713                         ahc_outb(ahc, CLRSINT1, CLRREQINIT);
2714 #ifdef AHC_DEBUG
2715                         if ((ahc_debug & AHC_SHOW_MESSAGES) != 0)
2716                                 printf(" byte 0x%x\n", ahc->send_msg_perror);
2717 #endif
2718                         ahc_outb(ahc, SCSIDATL, MSG_PARITY_ERROR);
2719                         break;
2720                 }
2721
2722                 msgdone = ahc->msgout_index == ahc->msgout_len;
2723                 if (msgdone) {
2724                         /*
2725                          * The target has requested a retry.
2726                          * Re-assert ATN, reset our message index to
2727                          * 0, and try again.
2728                          */
2729                         ahc->msgout_index = 0;
2730                         ahc_assert_atn(ahc);
2731                 }
2732
2733                 lastbyte = ahc->msgout_index == (ahc->msgout_len - 1);
2734                 if (lastbyte) {
2735                         /* Last byte is signified by dropping ATN */
2736                         ahc_outb(ahc, CLRSINT1, CLRATNO);
2737                 }
2738
2739                 /*
2740                  * Clear our interrupt status and present
2741                  * the next byte on the bus.
2742                  */
2743                 ahc_outb(ahc, CLRSINT1, CLRREQINIT);
2744 #ifdef AHC_DEBUG
2745                 if ((ahc_debug & AHC_SHOW_MESSAGES) != 0)
2746                         printf(" byte 0x%x\n",
2747                                ahc->msgout_buf[ahc->msgout_index]);
2748 #endif
2749                 ahc_outb(ahc, SCSIDATL, ahc->msgout_buf[ahc->msgout_index++]);
2750                 break;
2751         }
2752         case MSG_TYPE_INITIATOR_MSGIN:
2753         {
2754                 int phasemis;
2755                 int message_done;
2756
2757 #ifdef AHC_DEBUG
2758                 if ((ahc_debug & AHC_SHOW_MESSAGES) != 0) {
2759                         ahc_print_devinfo(ahc, &devinfo);
2760                         printf("INITIATOR_MSG_IN");
2761                 }
2762 #endif
2763                 phasemis = bus_phase != P_MESGIN;
2764                 if (phasemis) {
2765 #ifdef AHC_DEBUG
2766                         if ((ahc_debug & AHC_SHOW_MESSAGES) != 0) {
2767                                 printf(" PHASEMIS %s\n",
2768                                        ahc_lookup_phase_entry(bus_phase)
2769                                                              ->phasemsg);
2770                         }
2771 #endif
2772                         ahc->msgin_index = 0;
2773                         if (bus_phase == P_MESGOUT
2774                          && (ahc->send_msg_perror == TRUE
2775                           || (ahc->msgout_len != 0
2776                            && ahc->msgout_index == 0))) {
2777                                 ahc->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
2778                                 goto reswitch;
2779                         }
2780                         end_session = TRUE;
2781                         break;
2782                 }
2783
2784                 /* Pull the byte in without acking it */
2785                 ahc->msgin_buf[ahc->msgin_index] = ahc_inb(ahc, SCSIBUSL);
2786 #ifdef AHC_DEBUG
2787                 if ((ahc_debug & AHC_SHOW_MESSAGES) != 0)
2788                         printf(" byte 0x%x\n",
2789                                ahc->msgin_buf[ahc->msgin_index]);
2790 #endif
2791
2792                 message_done = ahc_parse_msg(ahc, &devinfo);
2793
2794                 if (message_done) {
2795                         /*
2796                          * Clear our incoming message buffer in case there
2797                          * is another message following this one.
2798                          */
2799                         ahc->msgin_index = 0;
2800
2801                         /*
2802                          * If this message illicited a response,
2803                          * assert ATN so the target takes us to the
2804                          * message out phase.
2805                          */
2806                         if (ahc->msgout_len != 0) {
2807 #ifdef AHC_DEBUG
2808                                 if ((ahc_debug & AHC_SHOW_MESSAGES) != 0) {
2809                                         ahc_print_devinfo(ahc, &devinfo);
2810                                         printf("Asserting ATN for response\n");
2811                                 }
2812 #endif
2813                                 ahc_assert_atn(ahc);
2814                         }
2815                 } else
2816                         ahc->msgin_index++;
2817
2818                 if (message_done == MSGLOOP_TERMINATED) {
2819                         end_session = TRUE;
2820                 } else {
2821                         /* Ack the byte */
2822                         ahc_outb(ahc, CLRSINT1, CLRREQINIT);
2823                         ahc_inb(ahc, SCSIDATL);
2824                 }
2825                 break;
2826         }
2827         case MSG_TYPE_TARGET_MSGIN:
2828         {
2829                 int msgdone;
2830
2831                 if (ahc->msgout_len == 0)
2832                         panic("Target MSGIN with no active message");
2833
2834 #ifdef AHC_DEBUG
2835                 if ((ahc_debug & AHC_SHOW_MESSAGES) != 0) {
2836                         ahc_print_devinfo(ahc, &devinfo);
2837                         printf("TARGET_MSG_IN");
2838                 }
2839 #endif
2840
2841                 /*
2842                  * If we interrupted a mesgout session, the initiator
2843                  * will not know this until our first REQ.  So, we
2844                  * only honor mesgout requests after we've sent our
2845                  * first byte.
2846                  */
2847                 if ((ahc_inb(ahc, SCSISIGI) & ATNI) != 0
2848                  && ahc->msgout_index > 0) {
2849
2850                         /*
2851                          * Change gears and see if this messages is
2852                          * of interest to us or should be passed back
2853                          * to the sequencer.
2854                          */
2855 #ifdef AHC_DEBUG
2856                         if ((ahc_debug & AHC_SHOW_MESSAGES) != 0)
2857                                 printf(" Honoring ATN Request.\n");
2858 #endif
2859                         ahc->msg_type = MSG_TYPE_TARGET_MSGOUT;
2860
2861                         /*
2862                          * Disable SCSI Programmed I/O during the
2863                          * phase change so as to avoid phantom REQs.
2864                          */
2865                         ahc_outb(ahc, SXFRCTL0,
2866                                  ahc_inb(ahc, SXFRCTL0) & ~SPIOEN);
2867
2868                         /*
2869                          * Since SPIORDY asserts when ACK is asserted
2870                          * for P_MSGOUT, and SPIORDY's assertion triggered
2871                          * our entry into this routine, wait for ACK to
2872                          * *de-assert* before changing phases.
2873                          */
2874                         while ((ahc_inb(ahc, SCSISIGI) & ACKI) != 0)
2875                                 ;
2876
2877                         ahc_outb(ahc, SCSISIGO, P_MESGOUT | BSYO);
2878
2879                         /*
2880                          * All phase line changes require a bus
2881                          * settle delay before REQ is asserted.
2882                          * [SCSI SPI4 10.7.1]
2883                          */
2884                         ahc_flush_device_writes(ahc);
2885                         aic_delay(AHC_BUSSETTLE_DELAY);
2886
2887                         ahc->msgin_index = 0;
2888                         /* Enable SCSI Programmed I/O to REQ for first byte */
2889                         ahc_outb(ahc, SXFRCTL0,
2890                                  ahc_inb(ahc, SXFRCTL0) | SPIOEN);
2891                         break;
2892                 }
2893
2894                 msgdone = ahc->msgout_index == ahc->msgout_len;
2895                 if (msgdone) {
2896                         ahc_outb(ahc, SXFRCTL0,
2897                                  ahc_inb(ahc, SXFRCTL0) & ~SPIOEN);
2898                         end_session = TRUE;
2899                         break;
2900                 }
2901
2902                 /*
2903                  * Present the next byte on the bus.
2904                  */
2905 #ifdef AHC_DEBUG
2906                 if ((ahc_debug & AHC_SHOW_MESSAGES) != 0)
2907                         printf(" byte 0x%x\n",
2908                                ahc->msgout_buf[ahc->msgout_index]);
2909 #endif
2910                 ahc_outb(ahc, SXFRCTL0, ahc_inb(ahc, SXFRCTL0) | SPIOEN);
2911                 ahc_outb(ahc, SCSIDATL, ahc->msgout_buf[ahc->msgout_index++]);
2912                 break;
2913         }
2914         case MSG_TYPE_TARGET_MSGOUT:
2915         {
2916                 int lastbyte;
2917                 int msgdone;
2918
2919 #ifdef AHC_DEBUG
2920                 if ((ahc_debug & AHC_SHOW_MESSAGES) != 0) {
2921                         ahc_print_devinfo(ahc, &devinfo);
2922                         printf("TARGET_MSG_OUT");
2923                 }
2924 #endif
2925                 /*
2926                  * The initiator signals that this is
2927                  * the last byte by dropping ATN.
2928                  */
2929                 lastbyte = (ahc_inb(ahc, SCSISIGI) & ATNI) == 0;
2930
2931                 /*
2932                  * Read the latched byte, but turn off SPIOEN first
2933                  * so that we don't inadvertently cause a REQ for the
2934                  * next byte.
2935                  */
2936                 ahc_outb(ahc, SXFRCTL0, ahc_inb(ahc, SXFRCTL0) & ~SPIOEN);
2937                 ahc->msgin_buf[ahc->msgin_index] = ahc_inb(ahc, SCSIDATL);
2938
2939 #ifdef AHC_DEBUG
2940                 if ((ahc_debug & AHC_SHOW_MESSAGES) != 0)
2941                         printf(" byte 0x%x\n",
2942                                ahc->msgin_buf[ahc->msgin_index]);
2943 #endif
2944
2945                 msgdone = ahc_parse_msg(ahc, &devinfo);
2946                 if (msgdone == MSGLOOP_TERMINATED) {
2947                         /*
2948                          * The message is *really* done in that it caused
2949                          * us to go to bus free.  The sequencer has already
2950                          * been reset at this point, so pull the ejection
2951                          * handle.
2952                          */
2953                         return;
2954                 }
2955
2956                 ahc->msgin_index++;
2957
2958                 /*
2959                  * XXX Read spec about initiator dropping ATN too soon
2960                  *     and use msgdone to detect it.
2961                  */
2962                 if (msgdone == MSGLOOP_MSGCOMPLETE) {
2963                         ahc->msgin_index = 0;
2964
2965                         /*
2966                          * If this message illicited a response, transition
2967                          * to the Message in phase and send it.
2968                          */
2969                         if (ahc->msgout_len != 0) {
2970 #ifdef AHC_DEBUG
2971                                 if ((ahc_debug & AHC_SHOW_MESSAGES) != 0) {
2972                                         ahc_print_devinfo(ahc, &devinfo);
2973                                         printf(" preparing response.\n");
2974                                 }
2975 #endif
2976                                 ahc_outb(ahc, SCSISIGO, P_MESGIN | BSYO);
2977
2978                                 /*
2979                                  * All phase line changes require a bus
2980                                  * settle delay before REQ is asserted.
2981                                  * [SCSI SPI4 10.7.1]  When transitioning
2982                                  * from an OUT to an IN phase, we must
2983                                  * also wait a data release delay to allow
2984                                  * the initiator time to release the data
2985                                  * lines. [SCSI SPI4 10.12]
2986                                  */
2987                                 ahc_flush_device_writes(ahc);
2988                                 aic_delay(AHC_BUSSETTLE_DELAY
2989                                         + AHC_DATARELEASE_DELAY);
2990
2991                                 /*
2992                                  * Enable SCSI Programmed I/O.  This will
2993                                  * immediately cause SPIORDY to assert,
2994                                  * and the sequencer will call our message
2995                                  * loop again.
2996                                  */
2997                                 ahc_outb(ahc, SXFRCTL0,
2998                                          ahc_inb(ahc, SXFRCTL0) | SPIOEN);
2999                                 ahc->msg_type = MSG_TYPE_TARGET_MSGIN;
3000                                 ahc->msgin_index = 0;
3001                                 break;
3002                         }
3003                 }
3004
3005                 if (lastbyte)
3006                         end_session = TRUE;
3007                 else {
3008                         /* Ask for the next byte. */
3009                         ahc_outb(ahc, SXFRCTL0,
3010                                  ahc_inb(ahc, SXFRCTL0) | SPIOEN);
3011                 }
3012
3013                 break;
3014         }
3015         default:
3016                 panic("Unknown REQINIT message type");
3017         }
3018
3019         if (end_session) {
3020                 ahc_clear_msg_state(ahc);
3021                 ahc_outb(ahc, RETURN_1, EXIT_MSG_LOOP);
3022         } else
3023                 ahc_outb(ahc, RETURN_1, CONT_MSG_LOOP);
3024 }
3025
3026 /*
3027  * See if we sent a particular extended message to the target.
3028  * If "full" is true, return true only if the target saw the full
3029  * message.  If "full" is false, return true if the target saw at
3030  * least the first byte of the message.
3031  */
3032 static int
3033 ahc_sent_msg(struct ahc_softc *ahc, ahc_msgtype type, u_int msgval, int full)
3034 {
3035         int found;
3036         u_int index;
3037
3038         found = FALSE;
3039         index = 0;
3040
3041         while (index < ahc->msgout_len) {
3042                 if (ahc->msgout_buf[index] == MSG_EXTENDED) {
3043                         u_int end_index;
3044
3045                         end_index = index + 1 + ahc->msgout_buf[index + 1];
3046                         if (ahc->msgout_buf[index+2] == msgval
3047                          && type == AHCMSG_EXT) {
3048
3049                                 if (full) {
3050                                         if (ahc->msgout_index > end_index)
3051                                                 found = TRUE;
3052                                 } else if (ahc->msgout_index > index)
3053                                         found = TRUE;
3054                         }
3055                         index = end_index;
3056                 } else if (ahc->msgout_buf[index] >= MSG_SIMPLE_TASK
3057                         && ahc->msgout_buf[index] <= MSG_IGN_WIDE_RESIDUE) {
3058
3059                         /* Skip tag type and tag id or residue param*/
3060                         index += 2;
3061                 } else {
3062                         /* Single byte message */
3063                         if (type == AHCMSG_1B
3064                          && ahc->msgout_buf[index] == msgval
3065                          && ahc->msgout_index > index)
3066                                 found = TRUE;
3067                         index++;
3068                 }
3069
3070                 if (found)
3071                         break;
3072         }
3073         return (found);
3074 }
3075
3076 /*
3077  * Wait for a complete incoming message, parse it, and respond accordingly.
3078  */
3079 static int
3080 ahc_parse_msg(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
3081 {
3082         struct  ahc_initiator_tinfo *tinfo;
3083         struct  ahc_tmode_tstate *tstate;
3084         int     reject;
3085         int     done;
3086         int     response;
3087         u_int   targ_scsirate;
3088
3089         done = MSGLOOP_IN_PROG;
3090         response = FALSE;
3091         reject = FALSE;
3092         tinfo = ahc_fetch_transinfo(ahc, devinfo->channel, devinfo->our_scsiid,
3093                                     devinfo->target, &tstate);
3094         targ_scsirate = tinfo->scsirate;
3095
3096         /*
3097          * Parse as much of the message as is available,
3098          * rejecting it if we don't support it.  When
3099          * the entire message is available and has been
3100          * handled, return MSGLOOP_MSGCOMPLETE, indicating
3101          * that we have parsed an entire message.
3102          *
3103          * In the case of extended messages, we accept the length
3104          * byte outright and perform more checking once we know the
3105          * extended message type.
3106          */
3107         switch (ahc->msgin_buf[0]) {
3108         case MSG_DISCONNECT:
3109         case MSG_SAVEDATAPOINTER:
3110         case MSG_CMDCOMPLETE:
3111         case MSG_RESTOREPOINTERS:
3112         case MSG_IGN_WIDE_RESIDUE:
3113                 /*
3114                  * End our message loop as these are messages
3115                  * the sequencer handles on its own.
3116                  */
3117                 done = MSGLOOP_TERMINATED;
3118                 break;
3119         case MSG_MESSAGE_REJECT:
3120                 response = ahc_handle_msg_reject(ahc, devinfo);
3121                 /* FALLTHROUGH */
3122         case MSG_NOOP:
3123                 done = MSGLOOP_MSGCOMPLETE;
3124                 break;
3125         case MSG_EXTENDED:
3126         {
3127                 /* Wait for enough of the message to begin validation */
3128                 if (ahc->msgin_index < 2)
3129                         break;
3130                 switch (ahc->msgin_buf[2]) {
3131                 case MSG_EXT_SDTR:
3132                 {
3133                         struct   ahc_syncrate *syncrate;
3134                         u_int    period;
3135                         u_int    ppr_options;
3136                         u_int    offset;
3137                         u_int    saved_offset;
3138
3139                         if (ahc->msgin_buf[1] != MSG_EXT_SDTR_LEN) {
3140                                 reject = TRUE;
3141                                 break;
3142                         }
3143
3144                         /*
3145                          * Wait until we have both args before validating
3146                          * and acting on this message.
3147                          *
3148                          * Add one to MSG_EXT_SDTR_LEN to account for
3149                          * the extended message preamble.
3150                          */
3151                         if (ahc->msgin_index < (MSG_EXT_SDTR_LEN + 1))
3152                                 break;
3153
3154                         period = ahc->msgin_buf[3];
3155                         ppr_options = 0;
3156                         saved_offset = offset = ahc->msgin_buf[4];
3157                         syncrate = ahc_devlimited_syncrate(ahc, tinfo, &period,
3158                                                            &ppr_options,
3159                                                            devinfo->role);
3160                         ahc_validate_offset(ahc, tinfo, syncrate, &offset,
3161                                             targ_scsirate & WIDEXFER,
3162                                             devinfo->role);
3163                         if (bootverbose) {
3164                                 printf("(%s:%c:%d:%d): Received "
3165                                        "SDTR period %x, offset %x\n\t"
3166                                        "Filtered to period %x, offset %x\n",
3167                                        ahc_name(ahc), devinfo->channel,
3168                                        devinfo->target, devinfo->lun,
3169                                        ahc->msgin_buf[3], saved_offset,
3170                                        period, offset);
3171                         }
3172                         ahc_set_syncrate(ahc, devinfo,
3173                                          syncrate, period,
3174                                          offset, ppr_options,
3175                                          AHC_TRANS_ACTIVE|AHC_TRANS_GOAL,
3176                                          /*paused*/TRUE);
3177
3178                         /*
3179                          * See if we initiated Sync Negotiation
3180                          * and didn't have to fall down to async
3181                          * transfers.
3182                          */
3183                         if (ahc_sent_msg(ahc, AHCMSG_EXT, MSG_EXT_SDTR, TRUE)) {
3184                                 /* We started it */
3185                                 if (saved_offset != offset) {
3186                                         /* Went too low - force async */
3187                                         reject = TRUE;
3188                                 }
3189                         } else {
3190                                 /*
3191                                  * Send our own SDTR in reply
3192                                  */
3193                                 if (bootverbose
3194                                  && devinfo->role == ROLE_INITIATOR) {
3195                                         printf("(%s:%c:%d:%d): Target "
3196                                                "Initiated SDTR\n",
3197                                                ahc_name(ahc), devinfo->channel,
3198                                                devinfo->target, devinfo->lun);
3199                                 }
3200                                 ahc->msgout_index = 0;
3201                                 ahc->msgout_len = 0;
3202                                 ahc_construct_sdtr(ahc, devinfo,
3203                                                    period, offset);
3204                                 ahc->msgout_index = 0;
3205                                 response = TRUE;
3206                         }
3207                         done = MSGLOOP_MSGCOMPLETE;
3208                         break;
3209                 }
3210                 case MSG_EXT_WDTR:
3211                 {
3212                         u_int bus_width;
3213                         u_int saved_width;
3214                         u_int sending_reply;
3215
3216                         sending_reply = FALSE;
3217                         if (ahc->msgin_buf[1] != MSG_EXT_WDTR_LEN) {
3218                                 reject = TRUE;
3219                                 break;
3220                         }
3221
3222                         /*
3223                          * Wait until we have our arg before validating
3224                          * and acting on this message.
3225                          *
3226                          * Add one to MSG_EXT_WDTR_LEN to account for
3227                          * the extended message preamble.
3228                          */
3229                         if (ahc->msgin_index < (MSG_EXT_WDTR_LEN + 1))
3230                                 break;
3231
3232                         bus_width = ahc->msgin_buf[3];
3233                         saved_width = bus_width;
3234                         ahc_validate_width(ahc, tinfo, &bus_width,
3235                                            devinfo->role);
3236                         if (bootverbose) {
3237                                 printf("(%s:%c:%d:%d): Received WDTR "
3238                                        "%x filtered to %x\n",
3239                                        ahc_name(ahc), devinfo->channel,
3240                                        devinfo->target, devinfo->lun,
3241                                        saved_width, bus_width);
3242                         }
3243
3244                         if (ahc_sent_msg(ahc, AHCMSG_EXT, MSG_EXT_WDTR, TRUE)) {
3245                                 /*
3246                                  * Don't send a WDTR back to the
3247                                  * target, since we asked first.
3248                                  * If the width went higher than our
3249                                  * request, reject it.
3250                                  */
3251                                 if (saved_width > bus_width) {
3252                                         reject = TRUE;
3253                                         printf("(%s:%c:%d:%d): requested %dBit "
3254                                                "transfers.  Rejecting...\n",
3255                                                ahc_name(ahc), devinfo->channel,
3256                                                devinfo->target, devinfo->lun,
3257                                                8 * (0x01 << bus_width));
3258                                         bus_width = 0;
3259                                 }
3260                         } else {
3261                                 /*
3262                                  * Send our own WDTR in reply
3263                                  */
3264                                 if (bootverbose
3265                                  && devinfo->role == ROLE_INITIATOR) {
3266                                         printf("(%s:%c:%d:%d): Target "
3267                                                "Initiated WDTR\n",
3268                                                ahc_name(ahc), devinfo->channel,
3269                                                devinfo->target, devinfo->lun);
3270                                 }
3271                                 ahc->msgout_index = 0;
3272                                 ahc->msgout_len = 0;
3273                                 ahc_construct_wdtr(ahc, devinfo, bus_width);
3274                                 ahc->msgout_index = 0;
3275                                 response = TRUE;
3276                                 sending_reply = TRUE;
3277                         }
3278                         /*
3279                          * After a wide message, we are async, but
3280                          * some devices don't seem to honor this portion
3281                          * of the spec.  Force a renegotiation of the
3282                          * sync component of our transfer agreement even
3283                          * if our goal is async.  By updating our width
3284                          * after forcing the negotiation, we avoid
3285                          * renegotiating for width.
3286                          */
3287                         ahc_update_neg_request(ahc, devinfo, tstate,
3288                                                tinfo, AHC_NEG_ALWAYS);
3289                         ahc_set_width(ahc, devinfo, bus_width,
3290                                       AHC_TRANS_ACTIVE|AHC_TRANS_GOAL,
3291                                       /*paused*/TRUE);
3292                         if (sending_reply == FALSE && reject == FALSE) {
3293
3294                                 /*
3295                                  * We will always have an SDTR to send.
3296                                  */
3297                                 ahc->msgout_index = 0;
3298                                 ahc->msgout_len = 0;
3299                                 ahc_build_transfer_msg(ahc, devinfo);
3300                                 ahc->msgout_index = 0;
3301                                 response = TRUE;
3302                         }
3303                         done = MSGLOOP_MSGCOMPLETE;
3304                         break;
3305                 }
3306                 case MSG_EXT_PPR:
3307                 {
3308                         struct  ahc_syncrate *syncrate;
3309                         u_int   period;
3310                         u_int   offset;
3311                         u_int   bus_width;
3312                         u_int   ppr_options;
3313                         u_int   saved_width;
3314                         u_int   saved_offset;
3315                         u_int   saved_ppr_options;
3316
3317                         if (ahc->msgin_buf[1] != MSG_EXT_PPR_LEN) {
3318                                 reject = TRUE;
3319                                 break;
3320                         }
3321
3322                         /*
3323                          * Wait until we have all args before validating
3324                          * and acting on this message.
3325                          *
3326                          * Add one to MSG_EXT_PPR_LEN to account for
3327                          * the extended message preamble.
3328                          */
3329                         if (ahc->msgin_index < (MSG_EXT_PPR_LEN + 1))
3330                                 break;
3331
3332                         period = ahc->msgin_buf[3];
3333                         offset = ahc->msgin_buf[5];
3334                         bus_width = ahc->msgin_buf[6];
3335                         saved_width = bus_width;
3336                         ppr_options = ahc->msgin_buf[7];
3337                         /*
3338                          * According to the spec, a DT only
3339                          * period factor with no DT option
3340                          * set implies async.
3341                          */
3342                         if ((ppr_options & MSG_EXT_PPR_DT_REQ) == 0
3343                          && period == 9)
3344                                 offset = 0;
3345                         saved_ppr_options = ppr_options;
3346                         saved_offset = offset;
3347
3348                         /*
3349                          * Mask out any options we don't support
3350                          * on any controller.  Transfer options are
3351                          * only available if we are negotiating wide.
3352                          */
3353                         ppr_options &= MSG_EXT_PPR_DT_REQ;
3354                         if (bus_width == 0)
3355                                 ppr_options = 0;
3356
3357                         ahc_validate_width(ahc, tinfo, &bus_width,
3358                                            devinfo->role);
3359                         syncrate = ahc_devlimited_syncrate(ahc, tinfo, &period,
3360                                                            &ppr_options,
3361                                                            devinfo->role);
3362                         ahc_validate_offset(ahc, tinfo, syncrate,
3363                                             &offset, bus_width,
3364                                             devinfo->role);
3365
3366                         if (ahc_sent_msg(ahc, AHCMSG_EXT, MSG_EXT_PPR, TRUE)) {
3367                                 /*
3368                                  * If we are unable to do any of the
3369                                  * requested options (we went too low),
3370                                  * then we'll have to reject the message.
3371                                  */
3372                                 if (saved_width > bus_width
3373                                  || saved_offset != offset
3374                                  || saved_ppr_options != ppr_options) {
3375                                         reject = TRUE;
3376                                         period = 0;
3377                                         offset = 0;
3378                                         bus_width = 0;
3379                                         ppr_options = 0;
3380                                         syncrate = NULL;
3381                                 }
3382                         } else {
3383                                 if (devinfo->role != ROLE_TARGET)
3384                                         printf("(%s:%c:%d:%d): Target "
3385                                                "Initiated PPR\n",
3386                                                ahc_name(ahc), devinfo->channel,
3387                                                devinfo->target, devinfo->lun);
3388                                 else
3389                                         printf("(%s:%c:%d:%d): Initiator "
3390                                                "Initiated PPR\n",
3391                                                ahc_name(ahc), devinfo->channel,
3392                                                devinfo->target, devinfo->lun);
3393                                 ahc->msgout_index = 0;
3394                                 ahc->msgout_len = 0;
3395                                 ahc_construct_ppr(ahc, devinfo, period, offset,
3396                                                   bus_width, ppr_options);
3397                                 ahc->msgout_index = 0;
3398                                 response = TRUE;
3399                         }
3400                         if (bootverbose) {
3401                                 printf("(%s:%c:%d:%d): Received PPR width %x, "
3402                                        "period %x, offset %x,options %x\n"
3403                                        "\tFiltered to width %x, period %x, "
3404                                        "offset %x, options %x\n",
3405                                        ahc_name(ahc), devinfo->channel,
3406                                        devinfo->target, devinfo->lun,
3407                                        saved_width, ahc->msgin_buf[3],
3408                                        saved_offset, saved_ppr_options,
3409                                        bus_width, period, offset, ppr_options);
3410                         }
3411                         ahc_set_width(ahc, devinfo, bus_width,
3412                                       AHC_TRANS_ACTIVE|AHC_TRANS_GOAL,
3413                                       /*paused*/TRUE);
3414                         ahc_set_syncrate(ahc, devinfo,
3415                                          syncrate, period,
3416                                          offset, ppr_options,
3417                                          AHC_TRANS_ACTIVE|AHC_TRANS_GOAL,
3418                                          /*paused*/TRUE);
3419                         done = MSGLOOP_MSGCOMPLETE;
3420                         break;
3421                 }
3422                 default:
3423                         /* Unknown extended message.  Reject it. */
3424                         reject = TRUE;
3425                         break;
3426                 }
3427                 break;
3428         }
3429 #ifdef AHC_TARGET_MODE
3430         case MSG_BUS_DEV_RESET:
3431                 ahc_handle_devreset(ahc, devinfo,
3432                                     CAM_BDR_SENT,
3433                                     "Bus Device Reset Received",
3434                                     /*verbose_level*/0);
3435                 ahc_restart(ahc);
3436                 done = MSGLOOP_TERMINATED;
3437                 break;
3438         case MSG_ABORT_TAG:
3439         case MSG_ABORT:
3440         case MSG_CLEAR_QUEUE:
3441         {
3442                 int tag;
3443
3444                 /* Target mode messages */
3445                 if (devinfo->role != ROLE_TARGET) {
3446                         reject = TRUE;
3447                         break;
3448                 }
3449                 tag = SCB_LIST_NULL;
3450                 if (ahc->msgin_buf[0] == MSG_ABORT_TAG)
3451                         tag = ahc_inb(ahc, INITIATOR_TAG);
3452                 ahc_abort_scbs(ahc, devinfo->target, devinfo->channel,
3453                                devinfo->lun, tag, ROLE_TARGET,
3454                                CAM_REQ_ABORTED);
3455
3456                 tstate = ahc->enabled_targets[devinfo->our_scsiid];
3457                 if (tstate != NULL) {
3458                         struct ahc_tmode_lstate* lstate;
3459
3460                         lstate = tstate->enabled_luns[devinfo->lun];
3461                         if (lstate != NULL) {
3462                                 ahc_queue_lstate_event(ahc, lstate,
3463                                                        devinfo->our_scsiid,
3464                                                        ahc->msgin_buf[0],
3465                                                        /*arg*/tag);
3466                                 ahc_send_lstate_events(ahc, lstate);
3467                         }
3468                 }
3469                 ahc_restart(ahc);
3470                 done = MSGLOOP_TERMINATED;
3471                 break;
3472         }
3473 #endif
3474         case MSG_TERM_IO_PROC:
3475         default:
3476                 reject = TRUE;
3477                 break;
3478         }
3479
3480         if (reject) {
3481                 /*
3482                  * Setup to reject the message.
3483                  */
3484                 ahc->msgout_index = 0;
3485                 ahc->msgout_len = 1;
3486                 ahc->msgout_buf[0] = MSG_MESSAGE_REJECT;
3487                 done = MSGLOOP_MSGCOMPLETE;
3488                 response = TRUE;
3489         }
3490
3491         if (done != MSGLOOP_IN_PROG && !response)
3492                 /* Clear the outgoing message buffer */
3493                 ahc->msgout_len = 0;
3494
3495         return (done);
3496 }
3497
3498 /*
3499  * Process a message reject message.
3500  */
3501 static int
3502 ahc_handle_msg_reject(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
3503 {
3504         /*
3505          * What we care about here is if we had an
3506          * outstanding SDTR or WDTR message for this
3507          * target.  If we did, this is a signal that
3508          * the target is refusing negotiation.
3509          */
3510         struct scb *scb;
3511         struct ahc_initiator_tinfo *tinfo;
3512         struct ahc_tmode_tstate *tstate;
3513         u_int scb_index;
3514         u_int last_msg;
3515         int   response = 0;
3516
3517         scb_index = ahc_inb(ahc, SCB_TAG);
3518         scb = ahc_lookup_scb(ahc, scb_index);
3519         tinfo = ahc_fetch_transinfo(ahc, devinfo->channel,
3520                                     devinfo->our_scsiid,
3521                                     devinfo->target, &tstate);
3522         /* Might be necessary */
3523         last_msg = ahc_inb(ahc, LAST_MSG);
3524
3525         if (ahc_sent_msg(ahc, AHCMSG_EXT, MSG_EXT_PPR, /*full*/FALSE)) {
3526                 /*
3527                  * Target does not support the PPR message.
3528                  * Attempt to negotiate SPI-2 style.
3529                  */
3530                 if (bootverbose) {
3531                         printf("(%s:%c:%d:%d): PPR Rejected. "
3532                                "Trying WDTR/SDTR\n",
3533                                ahc_name(ahc), devinfo->channel,
3534                                devinfo->target, devinfo->lun);
3535                 }
3536                 tinfo->goal.ppr_options = 0;
3537                 tinfo->curr.transport_version = 2;
3538                 tinfo->goal.transport_version = 2;
3539                 ahc->msgout_index = 0;
3540                 ahc->msgout_len = 0;
3541                 ahc_build_transfer_msg(ahc, devinfo);
3542                 ahc->msgout_index = 0;
3543                 response = 1;
3544         } else if (ahc_sent_msg(ahc, AHCMSG_EXT, MSG_EXT_WDTR, /*full*/FALSE)) {
3545
3546                 /* note 8bit xfers */
3547                 printf("(%s:%c:%d:%d): refuses WIDE negotiation.  Using "
3548                        "8bit transfers\n", ahc_name(ahc),
3549                        devinfo->channel, devinfo->target, devinfo->lun);
3550                 ahc_set_width(ahc, devinfo, MSG_EXT_WDTR_BUS_8_BIT,
3551                               AHC_TRANS_ACTIVE|AHC_TRANS_GOAL,
3552                               /*paused*/TRUE);
3553                 /*
3554                  * No need to clear the sync rate.  If the target
3555                  * did not accept the command, our syncrate is
3556                  * unaffected.  If the target started the negotiation,
3557                  * but rejected our response, we already cleared the
3558                  * sync rate before sending our WDTR.
3559                  */
3560                 if (tinfo->goal.offset != tinfo->curr.offset) {
3561
3562                         /* Start the sync negotiation */
3563                         ahc->msgout_index = 0;
3564                         ahc->msgout_len = 0;
3565                         ahc_build_transfer_msg(ahc, devinfo);
3566                         ahc->msgout_index = 0;
3567                         response = 1;
3568                 }
3569         } else if (ahc_sent_msg(ahc, AHCMSG_EXT, MSG_EXT_SDTR, /*full*/FALSE)) {
3570                 /* note asynch xfers and clear flag */
3571                 ahc_set_syncrate(ahc, devinfo, /*syncrate*/NULL, /*period*/0,
3572                                  /*offset*/0, /*ppr_options*/0,
3573                                  AHC_TRANS_ACTIVE|AHC_TRANS_GOAL,
3574                                  /*paused*/TRUE);
3575                 printf("(%s:%c:%d:%d): refuses synchronous negotiation. "
3576                        "Using asynchronous transfers\n",
3577                        ahc_name(ahc), devinfo->channel,
3578                        devinfo->target, devinfo->lun);
3579         } else if ((scb->hscb->control & MSG_SIMPLE_TASK) != 0) {
3580                 int tag_type;
3581                 int mask;
3582
3583                 tag_type = (scb->hscb->control & MSG_SIMPLE_TASK);
3584
3585                 if (tag_type == MSG_SIMPLE_TASK) {
3586                         printf("(%s:%c:%d:%d): refuses tagged commands.  "
3587                                "Performing non-tagged I/O\n", ahc_name(ahc),
3588                                devinfo->channel, devinfo->target, devinfo->lun);
3589                         ahc_set_tags(ahc, devinfo, AHC_QUEUE_NONE);
3590                         mask = ~0x23;
3591                 } else {
3592                         printf("(%s:%c:%d:%d): refuses %s tagged commands.  "
3593                                "Performing simple queue tagged I/O only\n",
3594                                ahc_name(ahc), devinfo->channel, devinfo->target,
3595                                devinfo->lun, tag_type == MSG_ORDERED_TASK
3596                                ? "ordered" : "head of queue");
3597                         ahc_set_tags(ahc, devinfo, AHC_QUEUE_BASIC);
3598                         mask = ~0x03;
3599                 }
3600
3601                 /*
3602                  * Resend the identify for this CCB as the target
3603                  * may believe that the selection is invalid otherwise.
3604                  */
3605                 ahc_outb(ahc, SCB_CONTROL,
3606                          ahc_inb(ahc, SCB_CONTROL) & mask);
3607                 scb->hscb->control &= mask;
3608                 aic_set_transaction_tag(scb, /*enabled*/FALSE,
3609                                         /*type*/MSG_SIMPLE_TASK);
3610                 ahc_outb(ahc, MSG_OUT, MSG_IDENTIFYFLAG);
3611                 ahc_assert_atn(ahc);
3612
3613                 /*
3614                  * This transaction is now at the head of
3615                  * the untagged queue for this target.
3616                  */
3617                 if ((ahc->flags & AHC_SCB_BTT) == 0) {
3618                         struct scb_tailq *untagged_q;
3619
3620                         untagged_q =
3621                             &(ahc->untagged_queues[devinfo->target_offset]);
3622                         TAILQ_INSERT_HEAD(untagged_q, scb, links.tqe);
3623                         scb->flags |= SCB_UNTAGGEDQ;
3624                 }
3625                 ahc_busy_tcl(ahc, BUILD_TCL(scb->hscb->scsiid, devinfo->lun),
3626                              scb->hscb->tag);
3627
3628                 /*
3629                  * Requeue all tagged commands for this target
3630                  * currently in our possession so they can be
3631                  * converted to untagged commands.
3632                  */
3633                 ahc_search_qinfifo(ahc, SCB_GET_TARGET(ahc, scb),
3634                                    SCB_GET_CHANNEL(ahc, scb),
3635                                    SCB_GET_LUN(scb), /*tag*/SCB_LIST_NULL,
3636                                    ROLE_INITIATOR, CAM_REQUEUE_REQ,
3637                                    SEARCH_COMPLETE);
3638         } else {
3639                 /*
3640                  * Otherwise, we ignore it.
3641                  */
3642                 printf("%s:%c:%d: Message reject for %x -- ignored\n",
3643                        ahc_name(ahc), devinfo->channel, devinfo->target,
3644                        last_msg);
3645         }
3646         return (response);
3647 }
3648
3649 /*
3650  * Process an ingnore wide residue message.
3651  */
3652 static void
3653 ahc_handle_ign_wide_residue(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
3654 {
3655         u_int scb_index;
3656         struct scb *scb;
3657
3658         scb_index = ahc_inb(ahc, SCB_TAG);
3659         scb = ahc_lookup_scb(ahc, scb_index);
3660         /*
3661          * XXX Actually check data direction in the sequencer?
3662          * Perhaps add datadir to some spare bits in the hscb?
3663          */
3664         if ((ahc_inb(ahc, SEQ_FLAGS) & DPHASE) == 0
3665          || aic_get_transfer_dir(scb) != CAM_DIR_IN) {
3666                 /*
3667                  * Ignore the message if we haven't
3668                  * seen an appropriate data phase yet.
3669                  */
3670         } else {
3671                 /*
3672                  * If the residual occurred on the last
3673                  * transfer and the transfer request was
3674                  * expected to end on an odd count, do
3675                  * nothing.  Otherwise, subtract a byte
3676                  * and update the residual count accordingly.
3677                  */
3678                 uint32_t sgptr;
3679
3680                 sgptr = ahc_inb(ahc, SCB_RESIDUAL_SGPTR);
3681                 if ((sgptr & SG_LIST_NULL) != 0
3682                  && (ahc_inb(ahc, SCB_LUN) & SCB_XFERLEN_ODD) != 0) {
3683                         /*
3684                          * If the residual occurred on the last
3685                          * transfer and the transfer request was
3686                          * expected to end on an odd count, do
3687                          * nothing.
3688                          */
3689                 } else {
3690                         struct ahc_dma_seg *sg;
3691                         uint32_t data_cnt;
3692                         uint32_t data_addr;
3693                         uint32_t sglen;
3694
3695                         /* Pull in all of the sgptr */
3696                         sgptr = ahc_inl(ahc, SCB_RESIDUAL_SGPTR);
3697                         data_cnt = ahc_inl(ahc, SCB_RESIDUAL_DATACNT);
3698
3699                         if ((sgptr & SG_LIST_NULL) != 0) {
3700                                 /*
3701                                  * The residual data count is not updated
3702                                  * for the command run to completion case.
3703                                  * Explicitly zero the count.
3704                                  */
3705                                 data_cnt &= ~AHC_SG_LEN_MASK;
3706                         }
3707
3708                         data_addr = ahc_inl(ahc, SHADDR);
3709
3710                         data_cnt += 1;
3711                         data_addr -= 1;
3712                         sgptr &= SG_PTR_MASK;
3713
3714                         sg = ahc_sg_bus_to_virt(scb, sgptr);
3715
3716                         /*
3717                          * The residual sg ptr points to the next S/G
3718                          * to load so we must go back one.
3719                          */
3720                         sg--;
3721                         sglen = aic_le32toh(sg->len) & AHC_SG_LEN_MASK;
3722                         if (sg != scb->sg_list
3723                          && sglen < (data_cnt & AHC_SG_LEN_MASK)) {
3724
3725                                 sg--;
3726                                 sglen = aic_le32toh(sg->len);
3727                                 /*
3728                                  * Preserve High Address and SG_LIST bits
3729                                  * while setting the count to 1.
3730                                  */
3731                                 data_cnt = 1 | (sglen & (~AHC_SG_LEN_MASK));
3732                                 data_addr = aic_le32toh(sg->addr)
3733                                           + (sglen & AHC_SG_LEN_MASK) - 1;
3734
3735                                 /*
3736                                  * Increment sg so it points to the
3737                                  * "next" sg.
3738                                  */
3739                                 sg++;
3740                                 sgptr = ahc_sg_virt_to_bus(scb, sg);
3741                         }
3742                         ahc_outl(ahc, SCB_RESIDUAL_SGPTR, sgptr);
3743                         ahc_outl(ahc, SCB_RESIDUAL_DATACNT, data_cnt);
3744                         /*
3745                          * Toggle the "oddness" of the transfer length
3746                          * to handle this mid-transfer ignore wide
3747                          * residue.  This ensures that the oddness is
3748                          * correct for subsequent data transfers.
3749                          */
3750                         ahc_outb(ahc, SCB_LUN,
3751                                  ahc_inb(ahc, SCB_LUN) ^ SCB_XFERLEN_ODD);
3752                 }
3753         }
3754 }
3755
3756
3757 /*
3758  * Reinitialize the data pointers for the active transfer
3759  * based on its current residual.
3760  */
3761 static void
3762 ahc_reinitialize_dataptrs(struct ahc_softc *ahc)
3763 {
3764         struct   scb *scb;
3765         struct   ahc_dma_seg *sg;
3766         u_int    scb_index;
3767         uint32_t sgptr;
3768         uint32_t resid;
3769         uint32_t dataptr;
3770
3771         scb_index = ahc_inb(ahc, SCB_TAG);
3772         scb = ahc_lookup_scb(ahc, scb_index);
3773         sgptr = (ahc_inb(ahc, SCB_RESIDUAL_SGPTR + 3) << 24)
3774               | (ahc_inb(ahc, SCB_RESIDUAL_SGPTR + 2) << 16)
3775               | (ahc_inb(ahc, SCB_RESIDUAL_SGPTR + 1) << 8)
3776               | ahc_inb(ahc, SCB_RESIDUAL_SGPTR);
3777
3778         sgptr &= SG_PTR_MASK;
3779         sg = ahc_sg_bus_to_virt(scb, sgptr);
3780
3781         /* The residual sg_ptr always points to the next sg */
3782         sg--;
3783
3784         resid = (ahc_inb(ahc, SCB_RESIDUAL_DATACNT + 2) << 16)
3785               | (ahc_inb(ahc, SCB_RESIDUAL_DATACNT + 1) << 8)
3786               | ahc_inb(ahc, SCB_RESIDUAL_DATACNT);
3787
3788         dataptr = aic_le32toh(sg->addr)
3789                 + (aic_le32toh(sg->len) & AHC_SG_LEN_MASK)
3790                 - resid;
3791         if ((ahc->flags & AHC_39BIT_ADDRESSING) != 0) {
3792                 u_int dscommand1;
3793
3794                 dscommand1 = ahc_inb(ahc, DSCOMMAND1);
3795                 ahc_outb(ahc, DSCOMMAND1, dscommand1 | HADDLDSEL0);
3796                 ahc_outb(ahc, HADDR,
3797                          (aic_le32toh(sg->len) >> 24) & SG_HIGH_ADDR_BITS);
3798                 ahc_outb(ahc, DSCOMMAND1, dscommand1);
3799         }
3800         ahc_outb(ahc, HADDR + 3, dataptr >> 24);
3801         ahc_outb(ahc, HADDR + 2, dataptr >> 16);
3802         ahc_outb(ahc, HADDR + 1, dataptr >> 8);
3803         ahc_outb(ahc, HADDR, dataptr);
3804         ahc_outb(ahc, HCNT + 2, resid >> 16);
3805         ahc_outb(ahc, HCNT + 1, resid >> 8);
3806         ahc_outb(ahc, HCNT, resid);
3807         if ((ahc->features & AHC_ULTRA2) == 0) {
3808                 ahc_outb(ahc, STCNT + 2, resid >> 16);
3809                 ahc_outb(ahc, STCNT + 1, resid >> 8);
3810                 ahc_outb(ahc, STCNT, resid);
3811         }
3812 }
3813
3814 /*
3815  * Handle the effects of issuing a bus device reset message.
3816  */
3817 static void
3818 ahc_handle_devreset(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
3819                     cam_status status, char *message, int verbose_level)
3820 {
3821 #ifdef AHC_TARGET_MODE
3822         struct ahc_tmode_tstate* tstate;
3823         u_int lun;
3824 #endif
3825         int found;
3826
3827         found = ahc_abort_scbs(ahc, devinfo->target, devinfo->channel,
3828                                CAM_LUN_WILDCARD, SCB_LIST_NULL, devinfo->role,
3829                                status);
3830
3831 #ifdef AHC_TARGET_MODE
3832         /*
3833          * Send an immediate notify ccb to all target mord peripheral
3834          * drivers affected by this action.
3835          */
3836         tstate = ahc->enabled_targets[devinfo->our_scsiid];
3837         if (tstate != NULL) {
3838                 for (lun = 0; lun < AHC_NUM_LUNS; lun++) {
3839                         struct ahc_tmode_lstate* lstate;
3840
3841                         lstate = tstate->enabled_luns[lun];
3842                         if (lstate == NULL)
3843                                 continue;
3844
3845                         ahc_queue_lstate_event(ahc, lstate, devinfo->our_scsiid,
3846                                                MSG_BUS_DEV_RESET, /*arg*/0);
3847                         ahc_send_lstate_events(ahc, lstate);
3848                 }
3849         }
3850 #endif
3851
3852         /*
3853          * Go back to async/narrow transfers and renegotiate.
3854          */
3855         ahc_set_width(ahc, devinfo, MSG_EXT_WDTR_BUS_8_BIT,
3856                       AHC_TRANS_CUR, /*paused*/TRUE);
3857         ahc_set_syncrate(ahc, devinfo, /*syncrate*/NULL,
3858                          /*period*/0, /*offset*/0, /*ppr_options*/0,
3859                          AHC_TRANS_CUR, /*paused*/TRUE);
3860
3861         if (status != CAM_SEL_TIMEOUT)
3862                 ahc_send_async(ahc, devinfo->channel, devinfo->target,
3863                                CAM_LUN_WILDCARD, AC_SENT_BDR, NULL);
3864
3865         if (message != NULL
3866          && (verbose_level <= bootverbose))
3867                 printf("%s: %s on %c:%d. %d SCBs aborted\n", ahc_name(ahc),
3868                        message, devinfo->channel, devinfo->target, found);
3869 }
3870
3871 #ifdef AHC_TARGET_MODE
3872 static void
3873 ahc_setup_target_msgin(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
3874                        struct scb *scb)
3875 {
3876
3877         /*
3878          * To facilitate adding multiple messages together,
3879          * each routine should increment the index and len
3880          * variables instead of setting them explicitly.
3881          */
3882         ahc->msgout_index = 0;
3883         ahc->msgout_len = 0;
3884
3885         if (scb != NULL && (scb->flags & SCB_AUTO_NEGOTIATE) != 0)
3886                 ahc_build_transfer_msg(ahc, devinfo);
3887         else
3888                 panic("ahc_intr: AWAITING target message with no message");
3889
3890         ahc->msgout_index = 0;
3891         ahc->msg_type = MSG_TYPE_TARGET_MSGIN;
3892 }
3893 #endif
3894 /**************************** Initialization **********************************/
3895 /*
3896  * Allocate a controller structure for a new device
3897  * and perform initial initializion.
3898  */
3899 struct ahc_softc *
3900 ahc_alloc(void *platform_arg, char *name)
3901 {
3902         struct  ahc_softc *ahc;
3903         int     i;
3904
3905 #ifndef __FreeBSD__
3906         ahc = malloc(sizeof(*ahc), M_DEVBUF, M_NOWAIT);
3907         if (!ahc) {
3908                 printf("aic7xxx: cannot malloc softc!\n");
3909                 free(name, M_DEVBUF);
3910                 return NULL;
3911         }
3912 #else
3913         ahc = device_get_softc((device_t)platform_arg);
3914 #endif
3915         memset(ahc, 0, sizeof(*ahc));
3916         ahc->seep_config = malloc(sizeof(*ahc->seep_config),
3917                                   M_DEVBUF, M_NOWAIT);
3918         if (ahc->seep_config == NULL) {
3919 #ifndef __FreeBSD__
3920                 free(ahc, M_DEVBUF);
3921 #endif
3922                 free(name, M_DEVBUF);
3923                 return (NULL);
3924         }
3925         LIST_INIT(&ahc->pending_scbs);
3926         LIST_INIT(&ahc->timedout_scbs);
3927         /* We don't know our unit number until the OSM sets it */
3928         ahc->name = name;
3929         ahc->unit = -1;
3930         ahc->description = NULL;
3931         ahc->channel = 'A';
3932         ahc->channel_b = 'B';
3933         ahc->chip = AHC_NONE;
3934         ahc->features = AHC_FENONE;
3935         ahc->bugs = AHC_BUGNONE;
3936         ahc->flags = AHC_FNONE;
3937         /*
3938          * Default to all error reporting enabled with the
3939          * sequencer operating at its fastest speed.
3940          * The bus attach code may modify this.
3941          */
3942         ahc->seqctl = FASTMODE;
3943
3944         for (i = 0; i < AHC_NUM_TARGETS; i++)
3945                 TAILQ_INIT(&ahc->untagged_queues[i]);
3946         if (ahc_platform_alloc(ahc, platform_arg) != 0) {
3947                 ahc_free(ahc);
3948                 ahc = NULL;
3949         }
3950         ahc_lockinit(ahc);
3951         return (ahc);
3952 }
3953
3954 int
3955 ahc_softc_init(struct ahc_softc *ahc)
3956 {
3957
3958         /* The IRQMS bit is only valid on VL and EISA chips */
3959         if ((ahc->chip & AHC_PCI) == 0)
3960                 ahc->unpause = ahc_inb(ahc, HCNTRL) & IRQMS;
3961         else
3962                 ahc->unpause = 0;
3963         ahc->pause = ahc->unpause | PAUSE;
3964         /* XXX The shared scb data stuff should be deprecated */
3965         if (ahc->scb_data == NULL) {
3966                 ahc->scb_data = malloc(sizeof(*ahc->scb_data),
3967                                        M_DEVBUF, M_NOWAIT);
3968                 if (ahc->scb_data == NULL)
3969                         return (ENOMEM);
3970                 memset(ahc->scb_data, 0, sizeof(*ahc->scb_data));
3971         }
3972
3973         return (0);
3974 }
3975
3976 void
3977 ahc_softc_insert(struct ahc_softc *ahc)
3978 {
3979         struct ahc_softc *list_ahc;
3980
3981 #if AIC_PCI_CONFIG > 0
3982         /*
3983          * Second Function PCI devices need to inherit some
3984          * settings from function 0.
3985          */
3986         if ((ahc->chip & AHC_BUS_MASK) == AHC_PCI
3987          && (ahc->features & AHC_MULTI_FUNC) != 0) {
3988                 TAILQ_FOREACH(list_ahc, &ahc_tailq, links) {
3989                         aic_dev_softc_t list_pci;
3990                         aic_dev_softc_t pci;
3991
3992                         list_pci = list_ahc->dev_softc;
3993                         pci = ahc->dev_softc;
3994                         if (aic_get_pci_slot(list_pci) == aic_get_pci_slot(pci)
3995                          && aic_get_pci_bus(list_pci) == aic_get_pci_bus(pci)) {
3996                                 struct ahc_softc *master;
3997                                 struct ahc_softc *slave;
3998
3999                                 if (aic_get_pci_function(list_pci) == 0) {
4000                                         master = list_ahc;
4001                                         slave = ahc;
4002                                 } else {
4003                                         master = ahc;
4004                                         slave = list_ahc;
4005                                 }
4006                                 slave->flags &= ~AHC_BIOS_ENABLED;
4007                                 slave->flags |=
4008                                     master->flags & AHC_BIOS_ENABLED;
4009                                 slave->flags &= ~AHC_PRIMARY_CHANNEL;
4010                                 slave->flags |=
4011                                     master->flags & AHC_PRIMARY_CHANNEL;
4012                                 break;
4013                         }
4014                 }
4015         }
4016 #endif
4017
4018         /*
4019          * Insertion sort into our list of softcs.
4020          */
4021         list_ahc = TAILQ_FIRST(&ahc_tailq);
4022         while (list_ahc != NULL
4023             && ahc_softc_comp(ahc, list_ahc) <= 0)
4024                 list_ahc = TAILQ_NEXT(list_ahc, links);
4025         if (list_ahc != NULL)
4026                 TAILQ_INSERT_BEFORE(list_ahc, ahc, links);
4027         else
4028                 TAILQ_INSERT_TAIL(&ahc_tailq, ahc, links);
4029         ahc->init_level++;
4030 }
4031
4032 void
4033 ahc_set_unit(struct ahc_softc *ahc, int unit)
4034 {
4035         ahc->unit = unit;
4036 }
4037
4038 void
4039 ahc_set_name(struct ahc_softc *ahc, char *name)
4040 {
4041         if (ahc->name != NULL)
4042                 free(ahc->name, M_DEVBUF);
4043         ahc->name = name;
4044 }
4045
4046 void
4047 ahc_free(struct ahc_softc *ahc)
4048 {
4049         int i;
4050
4051         ahc_terminate_recovery_thread(ahc);
4052         switch (ahc->init_level) {
4053         default:
4054         case 5:
4055                 ahc_shutdown(ahc);
4056                 /* FALLTHROUGH */
4057         case 4:
4058                 aic_dmamap_unload(ahc, ahc->shared_data_dmat,
4059                                   ahc->shared_data_dmamap);
4060                 /* FALLTHROUGH */
4061         case 3:
4062                 aic_dmamem_free(ahc, ahc->shared_data_dmat, ahc->qoutfifo,
4063                                 ahc->shared_data_dmamap);
4064                 /* FALLTHROUGH */
4065         case 2:
4066                 aic_dma_tag_destroy(ahc, ahc->shared_data_dmat);
4067         case 1:
4068 #ifndef __linux__
4069                 aic_dma_tag_destroy(ahc, ahc->buffer_dmat);
4070 #endif
4071                 break;
4072         case 0:
4073                 break;
4074         }
4075
4076 #ifndef __linux__
4077         aic_dma_tag_destroy(ahc, ahc->parent_dmat);
4078 #endif
4079         ahc_platform_free(ahc);
4080         ahc_fini_scbdata(ahc);
4081         for (i = 0; i < AHC_NUM_TARGETS; i++) {
4082                 struct ahc_tmode_tstate *tstate;
4083
4084                 tstate = ahc->enabled_targets[i];
4085                 if (tstate != NULL) {
4086 #ifdef AHC_TARGET_MODE
4087                         int j;
4088
4089                         for (j = 0; j < AHC_NUM_LUNS; j++) {
4090                                 struct ahc_tmode_lstate *lstate;
4091
4092                                 lstate = tstate->enabled_luns[j];
4093                                 if (lstate != NULL) {
4094                                         xpt_free_path(lstate->path);
4095                                         free(lstate, M_DEVBUF);
4096                                 }
4097                         }
4098 #endif
4099                         free(tstate, M_DEVBUF);
4100                 }
4101         }
4102 #ifdef AHC_TARGET_MODE
4103         if (ahc->black_hole != NULL) {
4104                 xpt_free_path(ahc->black_hole->path);
4105                 free(ahc->black_hole, M_DEVBUF);
4106         }
4107 #endif
4108         if (ahc->name != NULL)
4109                 free(ahc->name, M_DEVBUF);
4110         if (ahc->seep_config != NULL)
4111                 free(ahc->seep_config, M_DEVBUF);
4112 #ifndef __FreeBSD__
4113         free(ahc, M_DEVBUF);
4114 #endif
4115         return;
4116 }
4117
4118 void
4119 ahc_shutdown(void *arg)
4120 {
4121         struct  ahc_softc *ahc;
4122         int     i;
4123
4124         ahc = (struct ahc_softc *)arg;
4125
4126         /* This will reset most registers to 0, but not all */
4127         ahc_reset(ahc, /*reinit*/FALSE);
4128         ahc_outb(ahc, SCSISEQ, 0);
4129         ahc_outb(ahc, SXFRCTL0, 0);
4130         ahc_outb(ahc, DSPCISTATUS, 0);
4131
4132         for (i = TARG_SCSIRATE; i < SCSICONF; i++)
4133                 ahc_outb(ahc, i, 0);
4134 }
4135
4136 /*
4137  * Reset the controller and record some information about it
4138  * that is only available just after a reset.  If "reinit" is
4139  * non-zero, this reset occurred after initial configuration
4140  * and the caller requests that the chip be fully reinitialized
4141  * to a runable state.  Chip interrupts are *not* enabled after
4142  * a reinitialization.  The caller must enable interrupts via
4143  * ahc_intr_enable().
4144  */
4145 int
4146 ahc_reset(struct ahc_softc *ahc, int reinit)
4147 {
4148         u_int   sblkctl;
4149         u_int   sxfrctl1_a, sxfrctl1_b;
4150         int     error;
4151         int     wait;
4152
4153         /*
4154          * Preserve the value of the SXFRCTL1 register for all channels.
4155          * It contains settings that affect termination and we don't want
4156          * to disturb the integrity of the bus.
4157          */
4158         ahc_pause(ahc);
4159         sxfrctl1_b = 0;
4160         if ((ahc->chip & AHC_CHIPID_MASK) == AHC_AIC7770) {
4161                 u_int sblkctl;
4162
4163                 /*
4164                  * Save channel B's settings in case this chip
4165                  * is setup for TWIN channel operation.
4166                  */
4167                 sblkctl = ahc_inb(ahc, SBLKCTL);
4168                 ahc_outb(ahc, SBLKCTL, sblkctl | SELBUSB);
4169                 sxfrctl1_b = ahc_inb(ahc, SXFRCTL1);
4170                 ahc_outb(ahc, SBLKCTL, sblkctl & ~SELBUSB);
4171         }
4172         sxfrctl1_a = ahc_inb(ahc, SXFRCTL1);
4173
4174         ahc_outb(ahc, HCNTRL, CHIPRST | ahc->pause);
4175
4176         /*
4177          * Ensure that the reset has finished.  We delay 1000us
4178          * prior to reading the register to make sure the chip
4179          * has sufficiently completed its reset to handle register
4180          * accesses.
4181          */
4182         wait = 1000;
4183         do {
4184                 aic_delay(1000);
4185         } while (--wait && !(ahc_inb(ahc, HCNTRL) & CHIPRSTACK));
4186
4187         if (wait == 0) {
4188                 printf("%s: WARNING - Failed chip reset!  "
4189                        "Trying to initialize anyway.\n", ahc_name(ahc));
4190         }
4191         ahc_outb(ahc, HCNTRL, ahc->pause);
4192
4193         /* Determine channel configuration */
4194         sblkctl = ahc_inb(ahc, SBLKCTL) & (SELBUSB|SELWIDE);
4195         /* No Twin Channel PCI cards */
4196         if ((ahc->chip & AHC_PCI) != 0)
4197                 sblkctl &= ~SELBUSB;
4198         switch (sblkctl) {
4199         case 0:
4200                 /* Single Narrow Channel */
4201                 break;
4202         case 2:
4203                 /* Wide Channel */
4204                 ahc->features |= AHC_WIDE;
4205                 break;
4206         case 8:
4207                 /* Twin Channel */
4208                 ahc->features |= AHC_TWIN;
4209                 break;
4210         default:
4211                 printf(" Unsupported adapter type.  Ignoring\n");
4212                 return(-1);
4213         }
4214
4215         /*
4216          * Reload sxfrctl1.
4217          *
4218          * We must always initialize STPWEN to 1 before we
4219          * restore the saved values.  STPWEN is initialized
4220          * to a tri-state condition which can only be cleared
4221          * by turning it on.
4222          */
4223         if ((ahc->features & AHC_TWIN) != 0) {
4224                 u_int sblkctl;
4225
4226                 sblkctl = ahc_inb(ahc, SBLKCTL);
4227                 ahc_outb(ahc, SBLKCTL, sblkctl | SELBUSB);
4228                 ahc_outb(ahc, SXFRCTL1, sxfrctl1_b);
4229                 ahc_outb(ahc, SBLKCTL, sblkctl & ~SELBUSB);
4230         }
4231         ahc_outb(ahc, SXFRCTL1, sxfrctl1_a);
4232
4233         error = 0;
4234         if (reinit != 0)
4235                 /*
4236                  * If a recovery action has forced a chip reset,
4237                  * re-initialize the chip to our liking.
4238                  */
4239                 error = ahc->bus_chip_init(ahc);
4240 #ifdef AHC_DUMP_SEQ
4241         else
4242                 ahc_dumpseq(ahc);
4243 #endif
4244
4245         return (error);
4246 }
4247
4248 /*
4249  * Determine the number of SCBs available on the controller
4250  */
4251 int
4252 ahc_probe_scbs(struct ahc_softc *ahc) {
4253         int i;
4254
4255         for (i = 0; i < AHC_SCB_MAX; i++) {
4256
4257                 ahc_outb(ahc, SCBPTR, i);
4258                 ahc_outb(ahc, SCB_BASE, i);
4259                 if (ahc_inb(ahc, SCB_BASE) != i)
4260                         break;
4261                 ahc_outb(ahc, SCBPTR, 0);
4262                 if (ahc_inb(ahc, SCB_BASE) != 0)
4263                         break;
4264         }
4265         return (i);
4266 }
4267
4268 static void
4269 ahc_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error)
4270 {
4271         bus_addr_t *baddr;
4272
4273         baddr = (bus_addr_t *)arg;
4274         *baddr = segs->ds_addr;
4275 }
4276
4277 static void
4278 ahc_build_free_scb_list(struct ahc_softc *ahc)
4279 {
4280         int scbsize;
4281         int i;
4282
4283         scbsize = 32;
4284         if ((ahc->flags & AHC_LSCBS_ENABLED) != 0)
4285                 scbsize = 64;
4286
4287         for (i = 0; i < ahc->scb_data->maxhscbs; i++) {
4288                 int j;
4289
4290                 ahc_outb(ahc, SCBPTR, i);
4291
4292                 /*
4293                  * Touch all SCB bytes to avoid parity errors
4294                  * should one of our debugging routines read
4295                  * an otherwise uninitiatlized byte.
4296                  */
4297                 for (j = 0; j < scbsize; j++)
4298                         ahc_outb(ahc, SCB_BASE+j, 0xFF);
4299
4300                 /* Clear the control byte. */
4301                 ahc_outb(ahc, SCB_CONTROL, 0);
4302
4303                 /* Set the next pointer */
4304                 if ((ahc->flags & AHC_PAGESCBS) != 0)
4305                         ahc_outb(ahc, SCB_NEXT, i+1);
4306                 else
4307                         ahc_outb(ahc, SCB_NEXT, SCB_LIST_NULL);
4308
4309                 /* Make the tag number, SCSIID, and lun invalid */
4310                 ahc_outb(ahc, SCB_TAG, SCB_LIST_NULL);
4311                 ahc_outb(ahc, SCB_SCSIID, 0xFF);
4312                 ahc_outb(ahc, SCB_LUN, 0xFF);
4313         }
4314
4315         if ((ahc->flags & AHC_PAGESCBS) != 0) {
4316                 /* SCB 0 heads the free list. */
4317                 ahc_outb(ahc, FREE_SCBH, 0);
4318         } else {
4319                 /* No free list. */
4320                 ahc_outb(ahc, FREE_SCBH, SCB_LIST_NULL);
4321         }
4322
4323         /* Make sure that the last SCB terminates the free list */
4324         ahc_outb(ahc, SCBPTR, i-1);
4325         ahc_outb(ahc, SCB_NEXT, SCB_LIST_NULL);
4326 }
4327
4328 static int
4329 ahc_init_scbdata(struct ahc_softc *ahc)
4330 {
4331         struct scb_data *scb_data;
4332
4333         scb_data = ahc->scb_data;
4334         SLIST_INIT(&scb_data->free_scbs);
4335         SLIST_INIT(&scb_data->sg_maps);
4336
4337         /* Allocate SCB resources */
4338         scb_data->scbarray =
4339             (struct scb *)malloc(sizeof(struct scb) * AHC_SCB_MAX_ALLOC,
4340                                  M_DEVBUF, M_NOWAIT);
4341         if (scb_data->scbarray == NULL)
4342                 return (ENOMEM);
4343         memset(scb_data->scbarray, 0, sizeof(struct scb) * AHC_SCB_MAX_ALLOC);
4344
4345         /* Determine the number of hardware SCBs and initialize them */
4346
4347         scb_data->maxhscbs = ahc_probe_scbs(ahc);
4348         if (ahc->scb_data->maxhscbs == 0) {
4349                 printf("%s: No SCB space found\n", ahc_name(ahc));
4350                 return (ENXIO);
4351         }
4352
4353         /*
4354          * Create our DMA tags.  These tags define the kinds of device
4355          * accessible memory allocations and memory mappings we will
4356          * need to perform during normal operation.
4357          *
4358          * Unless we need to further restrict the allocation, we rely
4359          * on the restrictions of the parent dmat, hence the common
4360          * use of MAXADDR and MAXSIZE.
4361          */
4362
4363         /* DMA tag for our hardware scb structures */
4364         if (aic_dma_tag_create(ahc, ahc->parent_dmat, /*alignment*/1,
4365                                /*boundary*/BUS_SPACE_MAXADDR_32BIT + 1,
4366                                /*lowaddr*/BUS_SPACE_MAXADDR_32BIT,
4367                                /*highaddr*/BUS_SPACE_MAXADDR,
4368                                /*filter*/NULL, /*filterarg*/NULL,
4369                                AHC_SCB_MAX_ALLOC * sizeof(struct hardware_scb),
4370                                /*nsegments*/1,
4371                                /*maxsegsz*/BUS_SPACE_MAXSIZE_32BIT,
4372                                /*flags*/0, &scb_data->hscb_dmat) != 0) {
4373                 goto error_exit;
4374         }
4375
4376         scb_data->init_level++;
4377
4378         /* Allocation for our hscbs */
4379         if (aic_dmamem_alloc(ahc, scb_data->hscb_dmat,
4380                              (void **)&scb_data->hscbs,
4381                              BUS_DMA_NOWAIT | BUS_DMA_COHERENT,
4382                              &scb_data->hscb_dmamap) != 0) {
4383                 goto error_exit;
4384         }
4385
4386         scb_data->init_level++;
4387
4388         /* And permanently map them */
4389         aic_dmamap_load(ahc, scb_data->hscb_dmat, scb_data->hscb_dmamap,
4390                         scb_data->hscbs,
4391                         AHC_SCB_MAX_ALLOC * sizeof(struct hardware_scb),
4392                         ahc_dmamap_cb, &scb_data->hscb_busaddr, /*flags*/0);
4393
4394         scb_data->init_level++;
4395
4396         /* DMA tag for our sense buffers */
4397         if (aic_dma_tag_create(ahc, ahc->parent_dmat, /*alignment*/1,
4398                                /*boundary*/BUS_SPACE_MAXADDR_32BIT + 1,
4399                                /*lowaddr*/BUS_SPACE_MAXADDR_32BIT,
4400                                /*highaddr*/BUS_SPACE_MAXADDR,
4401                                /*filter*/NULL, /*filterarg*/NULL,
4402                                AHC_SCB_MAX_ALLOC * sizeof(struct scsi_sense_data),
4403                                /*nsegments*/1,
4404                                /*maxsegsz*/BUS_SPACE_MAXSIZE_32BIT,
4405                                /*flags*/0, &scb_data->sense_dmat) != 0) {
4406                 goto error_exit;
4407         }
4408
4409         scb_data->init_level++;
4410
4411         /* Allocate them */
4412         if (aic_dmamem_alloc(ahc, scb_data->sense_dmat,
4413                              (void **)&scb_data->sense,
4414                              BUS_DMA_NOWAIT, &scb_data->sense_dmamap) != 0) {
4415                 goto error_exit;
4416         }
4417
4418         scb_data->init_level++;
4419
4420         /* And permanently map them */
4421         aic_dmamap_load(ahc, scb_data->sense_dmat, scb_data->sense_dmamap,
4422                         scb_data->sense,
4423                         AHC_SCB_MAX_ALLOC * sizeof(struct scsi_sense_data),
4424                         ahc_dmamap_cb, &scb_data->sense_busaddr, /*flags*/0);
4425
4426         scb_data->init_level++;
4427
4428         /* DMA tag for our S/G structures.  We allocate in page sized chunks */
4429         if (aic_dma_tag_create(ahc, ahc->parent_dmat, /*alignment*/8,
4430                                /*boundary*/BUS_SPACE_MAXADDR_32BIT + 1,
4431                                /*lowaddr*/BUS_SPACE_MAXADDR_32BIT,
4432                                /*highaddr*/BUS_SPACE_MAXADDR,
4433                                /*filter*/NULL, /*filterarg*/NULL,
4434                                PAGE_SIZE, /*nsegments*/1,
4435                                /*maxsegsz*/BUS_SPACE_MAXSIZE_32BIT,
4436                                /*flags*/0, &scb_data->sg_dmat) != 0) {
4437                 goto error_exit;
4438         }
4439
4440         scb_data->init_level++;
4441
4442         /* Perform initial CCB allocation */
4443         memset(scb_data->hscbs, 0,
4444                AHC_SCB_MAX_ALLOC * sizeof(struct hardware_scb));
4445         while (ahc_alloc_scbs(ahc) != 0)
4446                 ;
4447
4448         if (scb_data->numscbs == 0) {
4449                 printf("%s: ahc_init_scbdata - "
4450                        "Unable to allocate initial scbs\n",
4451                        ahc_name(ahc));
4452                 goto error_exit;
4453         }
4454
4455         /*
4456          * Reserve the next queued SCB.
4457          */
4458         ahc->next_queued_scb = ahc_get_scb(ahc);
4459
4460         /*
4461          * Note that we were successful
4462          */
4463         return (0);
4464
4465 error_exit:
4466
4467         return (ENOMEM);
4468 }
4469
4470 static void
4471 ahc_fini_scbdata(struct ahc_softc *ahc)
4472 {
4473         struct scb_data *scb_data;
4474
4475         scb_data = ahc->scb_data;
4476         if (scb_data == NULL)
4477                 return;
4478
4479         switch (scb_data->init_level) {
4480         default:
4481         case 7:
4482         {
4483                 struct sg_map_node *sg_map;
4484
4485                 while ((sg_map = SLIST_FIRST(&scb_data->sg_maps))!= NULL) {
4486                         SLIST_REMOVE_HEAD(&scb_data->sg_maps, links);
4487                         aic_dmamap_unload(ahc, scb_data->sg_dmat,
4488                                           sg_map->sg_dmamap);
4489                         aic_dmamem_free(ahc, scb_data->sg_dmat,
4490                                         sg_map->sg_vaddr,
4491                                         sg_map->sg_dmamap);
4492                         free(sg_map, M_DEVBUF);
4493                 }
4494                 aic_dma_tag_destroy(ahc, scb_data->sg_dmat);
4495         }
4496         case 6:
4497                 aic_dmamap_unload(ahc, scb_data->sense_dmat,
4498                                   scb_data->sense_dmamap);
4499         case 5:
4500                 aic_dmamem_free(ahc, scb_data->sense_dmat, scb_data->sense,
4501                                 scb_data->sense_dmamap);
4502         case 4:
4503                 aic_dma_tag_destroy(ahc, scb_data->sense_dmat);
4504         case 3:
4505                 aic_dmamap_unload(ahc, scb_data->hscb_dmat,
4506                                   scb_data->hscb_dmamap);
4507         case 2:
4508                 aic_dmamem_free(ahc, scb_data->hscb_dmat, scb_data->hscbs,
4509                                 scb_data->hscb_dmamap);
4510         case 1:
4511                 aic_dma_tag_destroy(ahc, scb_data->hscb_dmat);
4512                 break;
4513         case 0:
4514                 break;
4515         }
4516         if (scb_data->scbarray != NULL)
4517                 free(scb_data->scbarray, M_DEVBUF);
4518 }
4519
4520 int
4521 ahc_alloc_scbs(struct ahc_softc *ahc)
4522 {
4523         struct scb_data *scb_data;
4524         struct scb *next_scb;
4525         struct sg_map_node *sg_map;
4526         bus_addr_t physaddr;
4527         struct ahc_dma_seg *segs;
4528         int newcount;
4529         int i;
4530
4531         scb_data = ahc->scb_data;
4532         if (scb_data->numscbs >= AHC_SCB_MAX_ALLOC)
4533                 /* Can't allocate any more */
4534                 return (0);
4535
4536         next_scb = &scb_data->scbarray[scb_data->numscbs];
4537
4538         sg_map = malloc(sizeof(*sg_map), M_DEVBUF, M_NOWAIT);
4539
4540         if (sg_map == NULL)
4541                 return (0);
4542
4543         /* Allocate S/G space for the next batch of SCBS */
4544         if (aic_dmamem_alloc(ahc, scb_data->sg_dmat,
4545                              (void **)&sg_map->sg_vaddr,
4546                              BUS_DMA_NOWAIT | BUS_DMA_COHERENT,
4547                              &sg_map->sg_dmamap) != 0) {
4548                 free(sg_map, M_DEVBUF);
4549                 return (0);
4550         }
4551
4552         SLIST_INSERT_HEAD(&scb_data->sg_maps, sg_map, links);
4553
4554         aic_dmamap_load(ahc, scb_data->sg_dmat, sg_map->sg_dmamap,
4555                         sg_map->sg_vaddr, PAGE_SIZE, ahc_dmamap_cb,
4556                         &sg_map->sg_physaddr, /*flags*/0);
4557
4558         segs = sg_map->sg_vaddr;
4559         physaddr = sg_map->sg_physaddr;
4560
4561         newcount = (PAGE_SIZE / (AHC_NSEG * sizeof(struct ahc_dma_seg)));
4562         newcount = MIN(newcount, (AHC_SCB_MAX_ALLOC - scb_data->numscbs));
4563         for (i = 0; i < newcount; i++) {
4564                 struct scb_platform_data *pdata;
4565 #ifndef __linux__
4566                 int error;
4567 #endif
4568                 pdata = (struct scb_platform_data *)malloc(sizeof(*pdata),
4569                                                            M_DEVBUF, M_NOWAIT);
4570                 if (pdata == NULL)
4571                         break;
4572                 next_scb->platform_data = pdata;
4573                 next_scb->sg_map = sg_map;
4574                 next_scb->sg_list = segs;
4575                 /*
4576                  * The sequencer always starts with the second entry.
4577                  * The first entry is embedded in the scb.
4578                  */
4579                 next_scb->sg_list_phys = physaddr + sizeof(struct ahc_dma_seg);
4580                 next_scb->ahc_softc = ahc;
4581                 next_scb->flags = SCB_FLAG_NONE;
4582 #ifndef __linux__
4583                 error = aic_dmamap_create(ahc, ahc->buffer_dmat, /*flags*/0,
4584                                           &next_scb->dmamap);
4585                 if (error != 0)
4586                         break;
4587 #endif
4588                 next_scb->hscb = &scb_data->hscbs[scb_data->numscbs];
4589                 next_scb->hscb->tag = ahc->scb_data->numscbs;
4590                 aic_timer_init(&next_scb->io_timer);
4591                 SLIST_INSERT_HEAD(&ahc->scb_data->free_scbs,
4592                                   next_scb, links.sle);
4593                 segs += AHC_NSEG;
4594                 physaddr += (AHC_NSEG * sizeof(struct ahc_dma_seg));
4595                 next_scb++;
4596                 ahc->scb_data->numscbs++;
4597         }
4598         return (i);
4599 }
4600
4601 void
4602 ahc_controller_info(struct ahc_softc *ahc, char *buf)
4603 {
4604         int len;
4605
4606         len = sprintf(buf, "%s: ", ahc_chip_names[ahc->chip & AHC_CHIPID_MASK]);
4607         buf += len;
4608         if ((ahc->features & AHC_TWIN) != 0)
4609                 len = sprintf(buf, "Twin Channel, A SCSI Id=%d, "
4610                               "B SCSI Id=%d, primary %c, ",
4611                               ahc->our_id, ahc->our_id_b,
4612                               (ahc->flags & AHC_PRIMARY_CHANNEL) + 'A');
4613         else {
4614                 const char *speed;
4615                 const char *type;
4616
4617                 speed = "";
4618                 if ((ahc->features & AHC_ULTRA) != 0) {
4619                         speed = "Ultra ";
4620                 } else if ((ahc->features & AHC_DT) != 0) {
4621                         speed = "Ultra160 ";
4622                 } else if ((ahc->features & AHC_ULTRA2) != 0) {
4623                         speed = "Ultra2 ";
4624                 }
4625                 if ((ahc->features & AHC_WIDE) != 0) {
4626                         type = "Wide";
4627                 } else {
4628                         type = "Single";
4629                 }
4630                 len = sprintf(buf, "%s%s Channel %c, SCSI Id=%d, ",
4631                               speed, type, ahc->channel, ahc->our_id);
4632         }
4633         buf += len;
4634
4635         if ((ahc->flags & AHC_PAGESCBS) != 0)
4636                 sprintf(buf, "%d/%d SCBs",
4637                         ahc->scb_data->maxhscbs, AHC_MAX_QUEUE);
4638         else
4639                 sprintf(buf, "%d SCBs", ahc->scb_data->maxhscbs);
4640 }
4641
4642 int
4643 ahc_chip_init(struct ahc_softc *ahc)
4644 {
4645         int      term;
4646         int      error;
4647         u_int    i;
4648         u_int    scsi_conf;
4649         u_int    scsiseq_template;
4650         uint32_t physaddr;
4651
4652         ahc_outb(ahc, SEQ_FLAGS, 0);
4653         ahc_outb(ahc, SEQ_FLAGS2, 0);
4654
4655         /* Set the SCSI Id, SXFRCTL0, SXFRCTL1, and SIMODE1, for both channels*/
4656         if (ahc->features & AHC_TWIN) {
4657
4658                 /*
4659                  * Setup Channel B first.
4660                  */
4661                 ahc_outb(ahc, SBLKCTL, ahc_inb(ahc, SBLKCTL) | SELBUSB);
4662                 term = (ahc->flags & AHC_TERM_ENB_B) != 0 ? STPWEN : 0;
4663                 ahc_outb(ahc, SCSIID, ahc->our_id_b);
4664                 scsi_conf = ahc_inb(ahc, SCSICONF + 1);
4665                 ahc_outb(ahc, SXFRCTL1, (scsi_conf & (ENSPCHK|STIMESEL))
4666                                         |term|ahc->seltime_b|ENSTIMER|ACTNEGEN);
4667                 if ((ahc->features & AHC_ULTRA2) != 0)
4668                         ahc_outb(ahc, SIMODE0, ahc_inb(ahc, SIMODE0)|ENIOERR);
4669                 ahc_outb(ahc, SIMODE1, ENSELTIMO|ENSCSIRST|ENSCSIPERR);
4670                 ahc_outb(ahc, SXFRCTL0, DFON|SPIOEN);
4671
4672                 /* Select Channel A */
4673                 ahc_outb(ahc, SBLKCTL, ahc_inb(ahc, SBLKCTL) & ~SELBUSB);
4674         }
4675         term = (ahc->flags & AHC_TERM_ENB_A) != 0 ? STPWEN : 0;
4676         if ((ahc->features & AHC_ULTRA2) != 0)
4677                 ahc_outb(ahc, SCSIID_ULTRA2, ahc->our_id);
4678         else
4679                 ahc_outb(ahc, SCSIID, ahc->our_id);
4680         scsi_conf = ahc_inb(ahc, SCSICONF);
4681         ahc_outb(ahc, SXFRCTL1, (scsi_conf & (ENSPCHK|STIMESEL))
4682                                 |term|ahc->seltime
4683                                 |ENSTIMER|ACTNEGEN);
4684         if ((ahc->features & AHC_ULTRA2) != 0)
4685                 ahc_outb(ahc, SIMODE0, ahc_inb(ahc, SIMODE0)|ENIOERR);
4686         ahc_outb(ahc, SIMODE1, ENSELTIMO|ENSCSIRST|ENSCSIPERR);
4687         ahc_outb(ahc, SXFRCTL0, DFON|SPIOEN);
4688
4689         /* There are no untagged SCBs active yet. */
4690         for (i = 0; i < 16; i++) {
4691                 ahc_unbusy_tcl(ahc, BUILD_TCL(i << 4, 0));
4692                 if ((ahc->flags & AHC_SCB_BTT) != 0) {
4693                         int lun;
4694
4695                         /*
4696                          * The SCB based BTT allows an entry per
4697                          * target and lun pair.
4698                          */
4699                         for (lun = 1; lun < AHC_NUM_LUNS; lun++)
4700                                 ahc_unbusy_tcl(ahc, BUILD_TCL(i << 4, lun));
4701                 }
4702         }
4703
4704         /* All of our queues are empty */
4705         for (i = 0; i < 256; i++)
4706                 ahc->qoutfifo[i] = SCB_LIST_NULL;
4707         ahc_sync_qoutfifo(ahc, BUS_DMASYNC_PREREAD);
4708
4709         for (i = 0; i < 256; i++)
4710                 ahc->qinfifo[i] = SCB_LIST_NULL;
4711
4712         if ((ahc->features & AHC_MULTI_TID) != 0) {
4713                 ahc_outb(ahc, TARGID, 0);
4714                 ahc_outb(ahc, TARGID + 1, 0);
4715         }
4716
4717         /*
4718          * Tell the sequencer where it can find our arrays in memory.
4719          */
4720         physaddr = ahc->scb_data->hscb_busaddr;
4721         ahc_outb(ahc, HSCB_ADDR, physaddr & 0xFF);
4722         ahc_outb(ahc, HSCB_ADDR + 1, (physaddr >> 8) & 0xFF);
4723         ahc_outb(ahc, HSCB_ADDR + 2, (physaddr >> 16) & 0xFF);
4724         ahc_outb(ahc, HSCB_ADDR + 3, (physaddr >> 24) & 0xFF);
4725
4726         physaddr = ahc->shared_data_busaddr;
4727         ahc_outb(ahc, SHARED_DATA_ADDR, physaddr & 0xFF);
4728         ahc_outb(ahc, SHARED_DATA_ADDR + 1, (physaddr >> 8) & 0xFF);
4729         ahc_outb(ahc, SHARED_DATA_ADDR + 2, (physaddr >> 16) & 0xFF);
4730         ahc_outb(ahc, SHARED_DATA_ADDR + 3, (physaddr >> 24) & 0xFF);
4731
4732         /*
4733          * Initialize the group code to command length table.
4734          * This overrides the values in TARG_SCSIRATE, so only
4735          * setup the table after we have processed that information.
4736          */
4737         ahc_outb(ahc, CMDSIZE_TABLE, 5);
4738         ahc_outb(ahc, CMDSIZE_TABLE + 1, 9);
4739         ahc_outb(ahc, CMDSIZE_TABLE + 2, 9);
4740         ahc_outb(ahc, CMDSIZE_TABLE + 3, 0);
4741         ahc_outb(ahc, CMDSIZE_TABLE + 4, 15);
4742         ahc_outb(ahc, CMDSIZE_TABLE + 5, 11);
4743         ahc_outb(ahc, CMDSIZE_TABLE + 6, 0);
4744         ahc_outb(ahc, CMDSIZE_TABLE + 7, 0);
4745
4746         if ((ahc->features & AHC_HS_MAILBOX) != 0)
4747                 ahc_outb(ahc, HS_MAILBOX, 0);
4748
4749         /* Tell the sequencer of our initial queue positions */
4750         if ((ahc->features & AHC_TARGETMODE) != 0) {
4751                 ahc->tqinfifonext = 1;
4752                 ahc_outb(ahc, KERNEL_TQINPOS, ahc->tqinfifonext - 1);
4753                 ahc_outb(ahc, TQINPOS, ahc->tqinfifonext);
4754         }
4755         ahc->qinfifonext = 0;
4756         ahc->qoutfifonext = 0;
4757         if ((ahc->features & AHC_QUEUE_REGS) != 0) {
4758                 ahc_outb(ahc, QOFF_CTLSTA, SCB_QSIZE_256);
4759                 ahc_outb(ahc, HNSCB_QOFF, ahc->qinfifonext);
4760                 ahc_outb(ahc, SNSCB_QOFF, ahc->qinfifonext);
4761                 ahc_outb(ahc, SDSCB_QOFF, 0);
4762         } else {
4763                 ahc_outb(ahc, KERNEL_QINPOS, ahc->qinfifonext);
4764                 ahc_outb(ahc, QINPOS, ahc->qinfifonext);
4765                 ahc_outb(ahc, QOUTPOS, ahc->qoutfifonext);
4766         }
4767
4768         /* We don't have any waiting selections */
4769         ahc_outb(ahc, WAITING_SCBH, SCB_LIST_NULL);
4770
4771         /* Our disconnection list is empty too */
4772         ahc_outb(ahc, DISCONNECTED_SCBH, SCB_LIST_NULL);
4773
4774         /* Message out buffer starts empty */
4775         ahc_outb(ahc, MSG_OUT, MSG_NOOP);
4776
4777         /*
4778          * Setup the allowed SCSI Sequences based on operational mode.
4779          * If we are a target, we'll enalbe select in operations once
4780          * we've had a lun enabled.
4781          */
4782         scsiseq_template = ENSELO|ENAUTOATNO|ENAUTOATNP;
4783         if ((ahc->flags & AHC_INITIATORROLE) != 0)
4784                 scsiseq_template |= ENRSELI;
4785         ahc_outb(ahc, SCSISEQ_TEMPLATE, scsiseq_template);
4786
4787         /* Initialize our list of free SCBs. */
4788         ahc_build_free_scb_list(ahc);
4789
4790         /*
4791          * Tell the sequencer which SCB will be the next one it receives.
4792          */
4793         ahc_outb(ahc, NEXT_QUEUED_SCB, ahc->next_queued_scb->hscb->tag);
4794
4795         /*
4796          * Load the Sequencer program and Enable the adapter
4797          * in "fast" mode.
4798          */
4799         if (bootverbose)
4800                 printf("%s: Downloading Sequencer Program...",
4801                        ahc_name(ahc));
4802
4803         error = ahc_loadseq(ahc);
4804         if (error != 0)
4805                 return (error);
4806
4807         if ((ahc->features & AHC_ULTRA2) != 0) {
4808                 int wait;
4809
4810                 /*
4811                  * Wait for up to 500ms for our transceivers
4812                  * to settle.  If the adapter does not have
4813                  * a cable attached, the transceivers may
4814                  * never settle, so don't complain if we
4815                  * fail here.
4816                  */
4817                 for (wait = 5000;
4818                      (ahc_inb(ahc, SBLKCTL) & (ENAB40|ENAB20)) == 0 && wait;
4819                      wait--)
4820                         aic_delay(100);
4821         }
4822         ahc_restart(ahc);
4823         return (0);
4824 }
4825
4826 /*
4827  * Start the board, ready for normal operation
4828  */
4829 int
4830 ahc_init(struct ahc_softc *ahc)
4831 {
4832         int      max_targ;
4833         int      error;
4834         u_int    i;
4835         u_int    scsi_conf;
4836         u_int    ultraenb;
4837         u_int    discenable;
4838         u_int    tagenable;
4839         size_t   driver_data_size;
4840
4841 #ifdef AHC_DEBUG
4842         if ((ahc_debug & AHC_DEBUG_SEQUENCER) != 0)
4843                 ahc->flags |= AHC_SEQUENCER_DEBUG;
4844 #endif
4845
4846 #ifdef AHC_PRINT_SRAM
4847         printf("Scratch Ram:");
4848         for (i = 0x20; i < 0x5f; i++) {
4849                 if (((i % 8) == 0) && (i != 0)) {
4850                         printf ("\n              ");
4851                 }
4852                 printf (" 0x%x", ahc_inb(ahc, i));
4853         }
4854         if ((ahc->features & AHC_MORE_SRAM) != 0) {
4855                 for (i = 0x70; i < 0x7f; i++) {
4856                         if (((i % 8) == 0) && (i != 0)) {
4857                                 printf ("\n              ");
4858                         }
4859                         printf (" 0x%x", ahc_inb(ahc, i));
4860                 }
4861         }
4862         printf ("\n");
4863         /*
4864          * Reading uninitialized scratch ram may
4865          * generate parity errors.
4866          */
4867         ahc_outb(ahc, CLRINT, CLRPARERR);
4868         ahc_outb(ahc, CLRINT, CLRBRKADRINT);
4869 #endif
4870         max_targ = 15;
4871
4872         /*
4873          * Assume we have a board at this stage and it has been reset.
4874          */
4875         if ((ahc->flags & AHC_USEDEFAULTS) != 0)
4876                 ahc->our_id = ahc->our_id_b = 7;
4877
4878         /*
4879          * Default to allowing initiator operations.
4880          */
4881         ahc->flags |= AHC_INITIATORROLE;
4882
4883         /*
4884          * Only allow target mode features if this unit has them enabled.
4885          */
4886         if ((AHC_TMODE_ENABLE & (0x1 << ahc->unit)) == 0)
4887                 ahc->features &= ~AHC_TARGETMODE;
4888
4889 #ifndef __linux__
4890         /* DMA tag for mapping buffers into device visible space. */
4891         if (aic_dma_tag_create(ahc, ahc->parent_dmat, /*alignment*/1,
4892                                /*boundary*/BUS_SPACE_MAXADDR_32BIT + 1,
4893                                /*lowaddr*/ahc->flags & AHC_39BIT_ADDRESSING
4894                                         ? (bus_addr_t)0x7FFFFFFFFFULL
4895                                         : BUS_SPACE_MAXADDR_32BIT,
4896                                /*highaddr*/BUS_SPACE_MAXADDR,
4897                                /*filter*/NULL, /*filterarg*/NULL,
4898                                /*maxsize*/(AHC_NSEG - 1) * PAGE_SIZE,
4899                                /*nsegments*/AHC_NSEG,
4900                                /*maxsegsz*/AHC_MAXTRANSFER_SIZE,
4901                                /*flags*/BUS_DMA_ALLOCNOW,
4902                                &ahc->buffer_dmat) != 0) {
4903                 return (ENOMEM);
4904         }
4905 #endif
4906
4907         ahc->init_level++;
4908
4909         /*
4910          * DMA tag for our command fifos and other data in system memory
4911          * the card's sequencer must be able to access.  For initiator
4912          * roles, we need to allocate space for the qinfifo and qoutfifo.
4913          * The qinfifo and qoutfifo are composed of 256 1 byte elements.
4914          * When providing for the target mode role, we must additionally
4915          * provide space for the incoming target command fifo and an extra
4916          * byte to deal with a dma bug in some chip versions.
4917          */
4918         driver_data_size = 2 * 256 * sizeof(uint8_t);
4919         if ((ahc->features & AHC_TARGETMODE) != 0)
4920                 driver_data_size += AHC_TMODE_CMDS * sizeof(struct target_cmd)
4921                                  + /*DMA WideOdd Bug Buffer*/1;
4922         if (aic_dma_tag_create(ahc, ahc->parent_dmat, /*alignment*/1,
4923                                /*boundary*/BUS_SPACE_MAXADDR_32BIT + 1,
4924                                /*lowaddr*/BUS_SPACE_MAXADDR_32BIT,
4925                                /*highaddr*/BUS_SPACE_MAXADDR,
4926                                /*filter*/NULL, /*filterarg*/NULL,
4927                                driver_data_size,
4928                                /*nsegments*/1,
4929                                /*maxsegsz*/BUS_SPACE_MAXSIZE_32BIT,
4930                                /*flags*/0, &ahc->shared_data_dmat) != 0) {
4931                 return (ENOMEM);
4932         }
4933
4934         ahc->init_level++;
4935
4936         /* Allocation of driver data */
4937         if (aic_dmamem_alloc(ahc, ahc->shared_data_dmat,
4938                              (void **)&ahc->qoutfifo,
4939                              BUS_DMA_NOWAIT | BUS_DMA_COHERENT,
4940                              &ahc->shared_data_dmamap) != 0) {
4941                 return (ENOMEM);
4942         }
4943
4944         ahc->init_level++;
4945
4946         /* And permanently map it in */
4947         aic_dmamap_load(ahc, ahc->shared_data_dmat, ahc->shared_data_dmamap,
4948                         ahc->qoutfifo, driver_data_size, ahc_dmamap_cb,
4949                         &ahc->shared_data_busaddr, /*flags*/0);
4950
4951         if ((ahc->features & AHC_TARGETMODE) != 0) {
4952                 ahc->targetcmds = (struct target_cmd *)ahc->qoutfifo;
4953                 ahc->qoutfifo = (uint8_t *)&ahc->targetcmds[AHC_TMODE_CMDS];
4954                 ahc->dma_bug_buf = ahc->shared_data_busaddr
4955                                  + driver_data_size - 1;
4956                 /* All target command blocks start out invalid. */
4957                 for (i = 0; i < AHC_TMODE_CMDS; i++)
4958                         ahc->targetcmds[i].cmd_valid = 0;
4959                 ahc_sync_tqinfifo(ahc, BUS_DMASYNC_PREREAD);
4960                 ahc->qoutfifo = (uint8_t *)&ahc->targetcmds[256];
4961         }
4962         ahc->qinfifo = &ahc->qoutfifo[256];
4963
4964         ahc->init_level++;
4965
4966         /* Allocate SCB data now that buffer_dmat is initialized */
4967         if (ahc->scb_data->maxhscbs == 0)
4968                 if (ahc_init_scbdata(ahc) != 0)
4969                         return (ENOMEM);
4970
4971         /*
4972          * Allocate a tstate to house information for our
4973          * initiator presence on the bus as well as the user
4974          * data for any target mode initiator.
4975          */
4976         if (ahc_alloc_tstate(ahc, ahc->our_id, 'A') == NULL) {
4977                 printf("%s: unable to allocate ahc_tmode_tstate.  "
4978                        "Failing attach\n", ahc_name(ahc));
4979                 return (ENOMEM);
4980         }
4981
4982         if ((ahc->features & AHC_TWIN) != 0) {
4983                 if (ahc_alloc_tstate(ahc, ahc->our_id_b, 'B') == NULL) {
4984                         printf("%s: unable to allocate ahc_tmode_tstate.  "
4985                                "Failing attach\n", ahc_name(ahc));
4986                         return (ENOMEM);
4987                 }
4988         }
4989
4990         /*
4991          * Fire up a recovery thread for this controller.
4992          */
4993         error = ahc_spawn_recovery_thread(ahc);
4994         if (error != 0)
4995                 return (error);
4996
4997         if (ahc->scb_data->maxhscbs < AHC_SCB_MAX_ALLOC) {
4998                 ahc->flags |= AHC_PAGESCBS;
4999         } else {
5000                 ahc->flags &= ~AHC_PAGESCBS;
5001         }
5002
5003 #ifdef AHC_DEBUG
5004         if (ahc_debug & AHC_SHOW_MISC) {
5005                 printf("%s: hardware scb %u bytes; kernel scb %u bytes; "
5006                        "ahc_dma %u bytes\n",
5007                         ahc_name(ahc),
5008                         (u_int)sizeof(struct hardware_scb),
5009                         (u_int)sizeof(struct scb),
5010                         (u_int)sizeof(struct ahc_dma_seg));
5011         }
5012 #endif /* AHC_DEBUG */
5013
5014         /*
5015          * Look at the information that board initialization or
5016          * the board bios has left us.
5017          */
5018         if (ahc->features & AHC_TWIN) {
5019                 scsi_conf = ahc_inb(ahc, SCSICONF + 1);
5020                 if ((scsi_conf & RESET_SCSI) != 0
5021                  && (ahc->flags & AHC_INITIATORROLE) != 0)
5022                         ahc->flags |= AHC_RESET_BUS_B;
5023         }
5024
5025         scsi_conf = ahc_inb(ahc, SCSICONF);
5026         if ((scsi_conf & RESET_SCSI) != 0
5027          && (ahc->flags & AHC_INITIATORROLE) != 0)
5028                 ahc->flags |= AHC_RESET_BUS_A;
5029
5030         ultraenb = 0;
5031         tagenable = ALL_TARGETS_MASK;
5032
5033         /* Grab the disconnection disable table and invert it for our needs */
5034         if ((ahc->flags & AHC_USEDEFAULTS) != 0) {
5035                 printf("%s: Host Adapter Bios disabled.  Using default SCSI "
5036                         "device parameters\n", ahc_name(ahc));
5037                 ahc->flags |= AHC_EXTENDED_TRANS_A|AHC_EXTENDED_TRANS_B|
5038                               AHC_TERM_ENB_A|AHC_TERM_ENB_B;
5039                 discenable = ALL_TARGETS_MASK;
5040                 if ((ahc->features & AHC_ULTRA) != 0)
5041                         ultraenb = ALL_TARGETS_MASK;
5042         } else {
5043                 discenable = ~((ahc_inb(ahc, DISC_DSB + 1) << 8)
5044                            | ahc_inb(ahc, DISC_DSB));
5045                 if ((ahc->features & (AHC_ULTRA|AHC_ULTRA2)) != 0)
5046                         ultraenb = (ahc_inb(ahc, ULTRA_ENB + 1) << 8)
5047                                       | ahc_inb(ahc, ULTRA_ENB);
5048         }
5049
5050         if ((ahc->features & (AHC_WIDE|AHC_TWIN)) == 0)
5051                 max_targ = 7;
5052
5053         for (i = 0; i <= max_targ; i++) {
5054                 struct ahc_initiator_tinfo *tinfo;
5055                 struct ahc_tmode_tstate *tstate;
5056                 u_int our_id;
5057                 u_int target_id;
5058                 char channel;
5059
5060                 channel = 'A';
5061                 our_id = ahc->our_id;
5062                 target_id = i;
5063                 if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
5064                         channel = 'B';
5065                         our_id = ahc->our_id_b;
5066                         target_id = i % 8;
5067                 }
5068                 tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
5069                                             target_id, &tstate);
5070                 /* Default to async narrow across the board */
5071                 memset(tinfo, 0, sizeof(*tinfo));
5072                 if (ahc->flags & AHC_USEDEFAULTS) {
5073                         if ((ahc->features & AHC_WIDE) != 0)
5074                                 tinfo->user.width = MSG_EXT_WDTR_BUS_16_BIT;
5075
5076                         /*
5077                          * These will be truncated when we determine the
5078                          * connection type we have with the target.
5079                          */
5080                         tinfo->user.period = ahc_syncrates->period;
5081                         tinfo->user.offset = MAX_OFFSET;
5082                 } else {
5083                         u_int scsirate;
5084                         uint16_t mask;
5085
5086                         /* Take the settings leftover in scratch RAM. */
5087                         scsirate = ahc_inb(ahc, TARG_SCSIRATE + i);
5088                         mask = (0x01 << i);
5089                         if ((ahc->features & AHC_ULTRA2) != 0) {
5090                                 u_int offset;
5091                                 u_int maxsync;
5092
5093                                 if ((scsirate & SOFS) == 0x0F) {
5094                                         /*
5095                                          * Haven't negotiated yet,
5096                                          * so the format is different.
5097                                          */
5098                                         scsirate = (scsirate & SXFR) >> 4
5099                                                  | (ultraenb & mask)
5100                                                   ? 0x08 : 0x0
5101                                                  | (scsirate & WIDEXFER);
5102                                         offset = MAX_OFFSET_ULTRA2;
5103                                 } else
5104                                         offset = ahc_inb(ahc, TARG_OFFSET + i);
5105                                 if ((scsirate & ~WIDEXFER) == 0 && offset != 0)
5106                                         /* Set to the lowest sync rate, 5MHz */
5107                                         scsirate |= 0x1c;
5108                                 maxsync = AHC_SYNCRATE_ULTRA2;
5109                                 if ((ahc->features & AHC_DT) != 0)
5110                                         maxsync = AHC_SYNCRATE_DT;
5111                                 tinfo->user.period =
5112                                     ahc_find_period(ahc, scsirate, maxsync);
5113                                 if (offset == 0)
5114                                         tinfo->user.period = 0;
5115                                 else
5116                                         tinfo->user.offset = MAX_OFFSET;
5117                                 if ((scsirate & SXFR_ULTRA2) <= 8/*10MHz*/
5118                                  && (ahc->features & AHC_DT) != 0)
5119                                         tinfo->user.ppr_options =
5120                                             MSG_EXT_PPR_DT_REQ;
5121                         } else if ((scsirate & SOFS) != 0) {
5122                                 if ((scsirate & SXFR) == 0x40
5123                                  && (ultraenb & mask) != 0) {
5124                                         /* Treat 10MHz as a non-ultra speed */
5125                                         scsirate &= ~SXFR;
5126                                         ultraenb &= ~mask;
5127                                 }
5128                                 tinfo->user.period =
5129                                     ahc_find_period(ahc, scsirate,
5130                                                     (ultraenb & mask)
5131                                                    ? AHC_SYNCRATE_ULTRA
5132                                                    : AHC_SYNCRATE_FAST);
5133                                 if (tinfo->user.period != 0)
5134                                         tinfo->user.offset = MAX_OFFSET;
5135                         }
5136                         if (tinfo->user.period == 0)
5137                                 tinfo->user.offset = 0;
5138                         if ((scsirate & WIDEXFER) != 0
5139                          && (ahc->features & AHC_WIDE) != 0)
5140                                 tinfo->user.width = MSG_EXT_WDTR_BUS_16_BIT;
5141                         tinfo->user.protocol_version = 4;
5142                         if ((ahc->features & AHC_DT) != 0)
5143                                 tinfo->user.transport_version = 3;
5144                         else
5145                                 tinfo->user.transport_version = 2;
5146                         tinfo->goal.protocol_version = 2;
5147                         tinfo->goal.transport_version = 2;
5148                         tinfo->curr.protocol_version = 2;
5149                         tinfo->curr.transport_version = 2;
5150                 }
5151                 tstate->ultraenb = 0;
5152         }
5153         ahc->user_discenable = discenable;
5154         ahc->user_tagenable = tagenable;
5155
5156         return (ahc->bus_chip_init(ahc));
5157 }
5158
5159 void
5160 ahc_intr_enable(struct ahc_softc *ahc, int enable)
5161 {
5162         u_int hcntrl;
5163
5164         hcntrl = ahc_inb(ahc, HCNTRL);
5165         hcntrl &= ~INTEN;
5166         ahc->pause &= ~INTEN;
5167         ahc->unpause &= ~INTEN;
5168         if (enable) {
5169                 hcntrl |= INTEN;
5170                 ahc->pause |= INTEN;
5171                 ahc->unpause |= INTEN;
5172         }
5173         ahc_outb(ahc, HCNTRL, hcntrl);
5174 }
5175
5176 /*
5177  * Ensure that the card is paused in a location
5178  * outside of all critical sections and that all
5179  * pending work is completed prior to returning.
5180  * This routine should only be called from outside
5181  * an interrupt context.
5182  */
5183 void
5184 ahc_pause_and_flushwork(struct ahc_softc *ahc)
5185 {
5186         int intstat;
5187         int maxloops;
5188         int paused;
5189
5190         maxloops = 1000;
5191         ahc->flags |= AHC_ALL_INTERRUPTS;
5192         paused = FALSE;
5193         do {
5194                 if (paused) {
5195                         ahc_unpause(ahc);
5196                         /*
5197                          * Give the sequencer some time to service
5198                          * any active selections.
5199                          */
5200                         aic_delay(500);
5201                 }
5202                 ahc_intr(ahc);
5203                 ahc_pause(ahc);
5204                 paused = TRUE;
5205                 ahc_outb(ahc, SCSISEQ, ahc_inb(ahc, SCSISEQ) & ~ENSELO);
5206                 intstat = ahc_inb(ahc, INTSTAT);
5207                 if ((intstat & INT_PEND) == 0) {
5208                         ahc_clear_critical_section(ahc);
5209                         intstat = ahc_inb(ahc, INTSTAT);
5210                 }
5211         } while (--maxloops
5212               && (intstat != 0xFF || (ahc->features & AHC_REMOVABLE) == 0)
5213               && ((intstat & INT_PEND) != 0
5214                || (ahc_inb(ahc, SSTAT0) & (SELDO|SELINGO)) != 0));
5215         if (maxloops == 0) {
5216                 printf("Infinite interrupt loop, INTSTAT = %x",
5217                        ahc_inb(ahc, INTSTAT));
5218         }
5219         ahc_platform_flushwork(ahc);
5220         ahc->flags &= ~AHC_ALL_INTERRUPTS;
5221 }
5222
5223 int
5224 ahc_suspend(struct ahc_softc *ahc)
5225 {
5226
5227         ahc_pause_and_flushwork(ahc);
5228
5229         if (LIST_FIRST(&ahc->pending_scbs) != NULL) {
5230                 ahc_unpause(ahc);
5231                 return (EBUSY);
5232         }
5233
5234 #ifdef AHC_TARGET_MODE
5235         /*
5236          * XXX What about ATIOs that have not yet been serviced?
5237          * Perhaps we should just refuse to be suspended if we
5238          * are acting in a target role.
5239          */
5240         if (ahc->pending_device != NULL) {
5241                 ahc_unpause(ahc);
5242                 return (EBUSY);
5243         }
5244 #endif
5245         ahc_shutdown(ahc);
5246         return (0);
5247 }
5248
5249 int
5250 ahc_resume(struct ahc_softc *ahc)
5251 {
5252
5253         ahc_reset(ahc, /*reinit*/TRUE);
5254         ahc_intr_enable(ahc, TRUE);
5255         ahc_restart(ahc);
5256         return (0);
5257 }
5258
5259 /************************** Busy Target Table *********************************/
5260 /*
5261  * Return the untagged transaction id for a given target/channel lun.
5262  * Optionally, clear the entry.
5263  */
5264 u_int
5265 ahc_index_busy_tcl(struct ahc_softc *ahc, u_int tcl)
5266 {
5267         u_int scbid;
5268         u_int target_offset;
5269
5270         if ((ahc->flags & AHC_SCB_BTT) != 0) {
5271                 u_int saved_scbptr;
5272
5273                 saved_scbptr = ahc_inb(ahc, SCBPTR);
5274                 ahc_outb(ahc, SCBPTR, TCL_LUN(tcl));
5275                 scbid = ahc_inb(ahc, SCB_64_BTT + TCL_TARGET_OFFSET(tcl));
5276                 ahc_outb(ahc, SCBPTR, saved_scbptr);
5277         } else {
5278                 target_offset = TCL_TARGET_OFFSET(tcl);
5279                 scbid = ahc_inb(ahc, BUSY_TARGETS + target_offset);
5280         }
5281
5282         return (scbid);
5283 }
5284
5285 void
5286 ahc_unbusy_tcl(struct ahc_softc *ahc, u_int tcl)
5287 {
5288         u_int target_offset;
5289
5290         if ((ahc->flags & AHC_SCB_BTT) != 0) {
5291                 u_int saved_scbptr;
5292
5293                 saved_scbptr = ahc_inb(ahc, SCBPTR);
5294                 ahc_outb(ahc, SCBPTR, TCL_LUN(tcl));
5295                 ahc_outb(ahc, SCB_64_BTT+TCL_TARGET_OFFSET(tcl), SCB_LIST_NULL);
5296                 ahc_outb(ahc, SCBPTR, saved_scbptr);
5297         } else {
5298                 target_offset = TCL_TARGET_OFFSET(tcl);
5299                 ahc_outb(ahc, BUSY_TARGETS + target_offset, SCB_LIST_NULL);
5300         }
5301 }
5302
5303 void
5304 ahc_busy_tcl(struct ahc_softc *ahc, u_int tcl, u_int scbid)
5305 {
5306         u_int target_offset;
5307
5308         if ((ahc->flags & AHC_SCB_BTT) != 0) {
5309                 u_int saved_scbptr;
5310
5311                 saved_scbptr = ahc_inb(ahc, SCBPTR);
5312                 ahc_outb(ahc, SCBPTR, TCL_LUN(tcl));
5313                 ahc_outb(ahc, SCB_64_BTT + TCL_TARGET_OFFSET(tcl), scbid);
5314                 ahc_outb(ahc, SCBPTR, saved_scbptr);
5315         } else {
5316                 target_offset = TCL_TARGET_OFFSET(tcl);
5317                 ahc_outb(ahc, BUSY_TARGETS + target_offset, scbid);
5318         }
5319 }
5320
5321 /************************** SCB and SCB queue management **********************/
5322 int
5323 ahc_match_scb(struct ahc_softc *ahc, struct scb *scb, int target,
5324               char channel, int lun, u_int tag, role_t role)
5325 {
5326         int targ = SCB_GET_TARGET(ahc, scb);
5327         char chan = SCB_GET_CHANNEL(ahc, scb);
5328         int slun = SCB_GET_LUN(scb);
5329         int match;
5330
5331         match = ((chan == channel) || (channel == ALL_CHANNELS));
5332         if (match != 0)
5333                 match = ((targ == target) || (target == CAM_TARGET_WILDCARD));
5334         if (match != 0)
5335                 match = ((lun == slun) || (lun == CAM_LUN_WILDCARD));
5336         if (match != 0) {
5337 #ifdef AHC_TARGET_MODE
5338                 int group;
5339
5340                 group = XPT_FC_GROUP(scb->io_ctx->ccb_h.func_code);
5341                 if (role == ROLE_INITIATOR) {
5342                         match = (group != XPT_FC_GROUP_TMODE)
5343                               && ((tag == scb->hscb->tag)
5344                                || (tag == SCB_LIST_NULL));
5345                 } else if (role == ROLE_TARGET) {
5346                         match = (group == XPT_FC_GROUP_TMODE)
5347                               && ((tag == scb->io_ctx->csio.tag_id)
5348                                || (tag == SCB_LIST_NULL));
5349                 }
5350 #else /* !AHC_TARGET_MODE */
5351                 match = ((tag == scb->hscb->tag) || (tag == SCB_LIST_NULL));
5352 #endif /* AHC_TARGET_MODE */
5353         }
5354
5355         return match;
5356 }
5357
5358 void
5359 ahc_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
5360 {
5361         int     target;
5362         char    channel;
5363         int     lun;
5364
5365         target = SCB_GET_TARGET(ahc, scb);
5366         lun = SCB_GET_LUN(scb);
5367         channel = SCB_GET_CHANNEL(ahc, scb);
5368
5369         ahc_search_qinfifo(ahc, target, channel, lun,
5370                            /*tag*/SCB_LIST_NULL, ROLE_UNKNOWN,
5371                            CAM_REQUEUE_REQ, SEARCH_COMPLETE);
5372
5373         ahc_platform_freeze_devq(ahc, scb);
5374 }
5375
5376 void
5377 ahc_qinfifo_requeue_tail(struct ahc_softc *ahc, struct scb *scb)
5378 {
5379         struct scb *prev_scb;
5380
5381         prev_scb = NULL;
5382         if (ahc_qinfifo_count(ahc) != 0) {
5383                 u_int prev_tag;
5384                 uint8_t prev_pos;
5385
5386                 prev_pos = ahc->qinfifonext - 1;
5387                 prev_tag = ahc->qinfifo[prev_pos];
5388                 prev_scb = ahc_lookup_scb(ahc, prev_tag);
5389         }
5390         ahc_qinfifo_requeue(ahc, prev_scb, scb);
5391         if ((ahc->features & AHC_QUEUE_REGS) != 0) {
5392                 ahc_outb(ahc, HNSCB_QOFF, ahc->qinfifonext);
5393         } else {
5394                 ahc_outb(ahc, KERNEL_QINPOS, ahc->qinfifonext);
5395         }
5396 }
5397
5398 static void
5399 ahc_qinfifo_requeue(struct ahc_softc *ahc, struct scb *prev_scb,
5400                     struct scb *scb)
5401 {
5402         if (prev_scb == NULL) {
5403                 ahc_outb(ahc, NEXT_QUEUED_SCB, scb->hscb->tag);
5404         } else {
5405                 prev_scb->hscb->next = scb->hscb->tag;
5406                 ahc_sync_scb(ahc, prev_scb,
5407                              BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
5408         }
5409         ahc->qinfifo[ahc->qinfifonext++] = scb->hscb->tag;
5410         scb->hscb->next = ahc->next_queued_scb->hscb->tag;
5411         ahc_sync_scb(ahc, scb, BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
5412 }
5413
5414 static int
5415 ahc_qinfifo_count(struct ahc_softc *ahc)
5416 {
5417         uint8_t qinpos;
5418         uint8_t diff;
5419
5420         if ((ahc->features & AHC_QUEUE_REGS) != 0) {
5421                 qinpos = ahc_inb(ahc, SNSCB_QOFF);
5422                 ahc_outb(ahc, SNSCB_QOFF, qinpos);
5423         } else
5424                 qinpos = ahc_inb(ahc, QINPOS);
5425         diff = ahc->qinfifonext - qinpos;
5426         return (diff);
5427 }
5428
5429 int
5430 ahc_search_qinfifo(struct ahc_softc *ahc, int target, char channel,
5431                    int lun, u_int tag, role_t role, uint32_t status,
5432                    ahc_search_action action)
5433 {
5434         struct  scb *scb;
5435         struct  scb *prev_scb;
5436         uint8_t qinstart;
5437         uint8_t qinpos;
5438         uint8_t qintail;
5439         uint8_t next;
5440         uint8_t prev;
5441         uint8_t curscbptr;
5442         int     found;
5443         int     have_qregs;
5444
5445         qintail = ahc->qinfifonext;
5446         have_qregs = (ahc->features & AHC_QUEUE_REGS) != 0;
5447         if (have_qregs) {
5448                 qinstart = ahc_inb(ahc, SNSCB_QOFF);
5449                 ahc_outb(ahc, SNSCB_QOFF, qinstart);
5450         } else
5451                 qinstart = ahc_inb(ahc, QINPOS);
5452         qinpos = qinstart;
5453         found = 0;
5454         prev_scb = NULL;
5455
5456         if (action == SEARCH_COMPLETE) {
5457                 /*
5458                  * Don't attempt to run any queued untagged transactions
5459                  * until we are done with the abort process.
5460                  */
5461                 ahc_freeze_untagged_queues(ahc);
5462         }
5463
5464         /*
5465          * Start with an empty queue.  Entries that are not chosen
5466          * for removal will be re-added to the queue as we go.
5467          */
5468         ahc->qinfifonext = qinpos;
5469         ahc_outb(ahc, NEXT_QUEUED_SCB, ahc->next_queued_scb->hscb->tag);
5470
5471         while (qinpos != qintail) {
5472                 scb = ahc_lookup_scb(ahc, ahc->qinfifo[qinpos]);
5473                 if (scb == NULL) {
5474                         printf("qinpos = %d, SCB index = %d\n",
5475                                 qinpos, ahc->qinfifo[qinpos]);
5476                         panic("Loop 1\n");
5477                 }
5478
5479                 if (ahc_match_scb(ahc, scb, target, channel, lun, tag, role)) {
5480                         /*
5481                          * We found an scb that needs to be acted on.
5482                          */
5483                         found++;
5484                         switch (action) {
5485                         case SEARCH_COMPLETE:
5486                         {
5487                                 cam_status ostat;
5488                                 cam_status cstat;
5489
5490                                 ostat = aic_get_transaction_status(scb);
5491                                 if (ostat == CAM_REQ_INPROG)
5492                                         aic_set_transaction_status(scb, status);
5493                                 cstat = aic_get_transaction_status(scb);
5494                                 if (cstat != CAM_REQ_CMP)
5495                                         aic_freeze_scb(scb);
5496                                 if ((scb->flags & SCB_ACTIVE) == 0)
5497                                         printf("Inactive SCB in qinfifo\n");
5498                                 ahc_done(ahc, scb);
5499
5500                                 /* FALLTHROUGH */
5501                         }
5502                         case SEARCH_REMOVE:
5503                                 break;
5504                         case SEARCH_COUNT:
5505                                 ahc_qinfifo_requeue(ahc, prev_scb, scb);
5506                                 prev_scb = scb;
5507                                 break;
5508                         }
5509                 } else {
5510                         ahc_qinfifo_requeue(ahc, prev_scb, scb);
5511                         prev_scb = scb;
5512                 }
5513                 qinpos++;
5514         }
5515
5516         if ((ahc->features & AHC_QUEUE_REGS) != 0) {
5517                 ahc_outb(ahc, HNSCB_QOFF, ahc->qinfifonext);
5518         } else {
5519                 ahc_outb(ahc, KERNEL_QINPOS, ahc->qinfifonext);
5520         }
5521
5522         if (action != SEARCH_COUNT
5523          && (found != 0)
5524          && (qinstart != ahc->qinfifonext)) {
5525                 /*
5526                  * The sequencer may be in the process of dmaing
5527                  * down the SCB at the beginning of the queue.
5528                  * This could be problematic if either the first,
5529                  * or the second SCB is removed from the queue
5530                  * (the first SCB includes a pointer to the "next"
5531                  * SCB to dma). If we have removed any entries, swap
5532                  * the first element in the queue with the next HSCB
5533                  * so the sequencer will notice that NEXT_QUEUED_SCB
5534                  * has changed during its dma attempt and will retry
5535                  * the DMA.
5536                  */
5537                 scb = ahc_lookup_scb(ahc, ahc->qinfifo[qinstart]);
5538
5539                 if (scb == NULL) {
5540                         printf("found = %d, qinstart = %d, qinfifionext = %d\n",
5541                                 found, qinstart, ahc->qinfifonext);
5542                         panic("First/Second Qinfifo fixup\n");
5543                 }
5544                 /*
5545                  * ahc_swap_with_next_hscb forces our next pointer to
5546                  * point to the reserved SCB for future commands.  Save
5547                  * and restore our original next pointer to maintain
5548                  * queue integrity.
5549                  */
5550                 next = scb->hscb->next;
5551                 ahc->scb_data->scbindex[scb->hscb->tag] = NULL;
5552                 ahc_swap_with_next_hscb(ahc, scb);
5553                 scb->hscb->next = next;
5554                 ahc->qinfifo[qinstart] = scb->hscb->tag;
5555
5556                 /* Tell the card about the new head of the qinfifo. */
5557                 ahc_outb(ahc, NEXT_QUEUED_SCB, scb->hscb->tag);
5558
5559                 /* Fixup the tail "next" pointer. */
5560                 qintail = ahc->qinfifonext - 1;
5561                 scb = ahc_lookup_scb(ahc, ahc->qinfifo[qintail]);
5562                 scb->hscb->next = ahc->next_queued_scb->hscb->tag;
5563         }
5564
5565         /*
5566          * Search waiting for selection list.
5567          */
5568         curscbptr = ahc_inb(ahc, SCBPTR);
5569         next = ahc_inb(ahc, WAITING_SCBH);  /* Start at head of list. */
5570         prev = SCB_LIST_NULL;
5571
5572         while (next != SCB_LIST_NULL) {
5573                 uint8_t scb_index;
5574
5575                 ahc_outb(ahc, SCBPTR, next);
5576                 scb_index = ahc_inb(ahc, SCB_TAG);
5577                 if (scb_index >= ahc->scb_data->numscbs) {
5578                         printf("Waiting List inconsistency. "
5579                                "SCB index == %d, yet numscbs == %d.",
5580                                scb_index, ahc->scb_data->numscbs);
5581                         ahc_dump_card_state(ahc);
5582                         panic("for safety");
5583                 }
5584                 scb = ahc_lookup_scb(ahc, scb_index);
5585                 if (scb == NULL) {
5586                         printf("scb_index = %d, next = %d\n",
5587                                 scb_index, next);
5588                         panic("Waiting List traversal\n");
5589                 }
5590                 if (ahc_match_scb(ahc, scb, target, channel,
5591                                   lun, SCB_LIST_NULL, role)) {
5592                         /*
5593                          * We found an scb that needs to be acted on.
5594                          */
5595                         found++;
5596                         switch (action) {
5597                         case SEARCH_COMPLETE:
5598                         {
5599                                 cam_status ostat;
5600                                 cam_status cstat;
5601
5602                                 ostat = aic_get_transaction_status(scb);
5603                                 if (ostat == CAM_REQ_INPROG)
5604                                         aic_set_transaction_status(scb,
5605                                                                    status);
5606                                 cstat = aic_get_transaction_status(scb);
5607                                 if (cstat != CAM_REQ_CMP)
5608                                         aic_freeze_scb(scb);
5609                                 if ((scb->flags & SCB_ACTIVE) == 0)
5610                                         printf("Inactive SCB in Wait List\n");
5611                                 ahc_done(ahc, scb);
5612                                 /* FALLTHROUGH */
5613                         }
5614                         case SEARCH_REMOVE:
5615                                 next = ahc_rem_wscb(ahc, next, prev);
5616                                 break;
5617                         case SEARCH_COUNT:
5618                                 prev = next;
5619                                 next = ahc_inb(ahc, SCB_NEXT);
5620                                 break;
5621                         }
5622                 } else {
5623
5624                         prev = next;
5625                         next = ahc_inb(ahc, SCB_NEXT);
5626                 }
5627         }
5628         ahc_outb(ahc, SCBPTR, curscbptr);
5629
5630         found += ahc_search_untagged_queues(ahc, /*aic_io_ctx_t*/NULL, target,
5631                                             channel, lun, status, action);
5632
5633         if (action == SEARCH_COMPLETE)
5634                 ahc_release_untagged_queues(ahc);
5635         return (found);
5636 }
5637
5638 int
5639 ahc_search_untagged_queues(struct ahc_softc *ahc, aic_io_ctx_t ctx,
5640                            int target, char channel, int lun, uint32_t status,
5641                            ahc_search_action action)
5642 {
5643         struct  scb *scb;
5644         int     maxtarget;
5645         int     found;
5646         int     i;
5647
5648         if (action == SEARCH_COMPLETE) {
5649                 /*
5650                  * Don't attempt to run any queued untagged transactions
5651                  * until we are done with the abort process.
5652                  */
5653                 ahc_freeze_untagged_queues(ahc);
5654         }
5655
5656         found = 0;
5657         i = 0;
5658         if ((ahc->flags & AHC_SCB_BTT) == 0) {
5659
5660                 maxtarget = 16;
5661                 if (target != CAM_TARGET_WILDCARD) {
5662
5663                         i = target;
5664                         if (channel == 'B')
5665                                 i += 8;
5666                         maxtarget = i + 1;
5667                 }
5668         } else {
5669                 maxtarget = 0;
5670         }
5671
5672         for (; i < maxtarget; i++) {
5673                 struct scb_tailq *untagged_q;
5674                 struct scb *next_scb;
5675
5676                 untagged_q = &(ahc->untagged_queues[i]);
5677                 next_scb = TAILQ_FIRST(untagged_q);
5678                 while (next_scb != NULL) {
5679
5680                         scb = next_scb;
5681                         next_scb = TAILQ_NEXT(scb, links.tqe);
5682
5683                         /*
5684                          * The head of the list may be the currently
5685                          * active untagged command for a device.
5686                          * We're only searching for commands that
5687                          * have not been started.  A transaction
5688                          * marked active but still in the qinfifo
5689                          * is removed by the qinfifo scanning code
5690                          * above.
5691                          */
5692                         if ((scb->flags & SCB_ACTIVE) != 0)
5693                                 continue;
5694
5695                         if (ahc_match_scb(ahc, scb, target, channel, lun,
5696                                           SCB_LIST_NULL, ROLE_INITIATOR) == 0
5697                          || (ctx != NULL && ctx != scb->io_ctx))
5698                                 continue;
5699
5700                         /*
5701                          * We found an scb that needs to be acted on.
5702                          */
5703                         found++;
5704                         switch (action) {
5705                         case SEARCH_COMPLETE:
5706                         {
5707                                 cam_status ostat;
5708                                 cam_status cstat;
5709
5710                                 ostat = aic_get_transaction_status(scb);
5711                                 if (ostat == CAM_REQ_INPROG)
5712                                         aic_set_transaction_status(scb, status);
5713                                 cstat = aic_get_transaction_status(scb);
5714                                 if (cstat != CAM_REQ_CMP)
5715                                         aic_freeze_scb(scb);
5716                                 ahc_done(ahc, scb);
5717                                 break;
5718                         }
5719                         case SEARCH_REMOVE:
5720                                 scb->flags &= ~SCB_UNTAGGEDQ;
5721                                 TAILQ_REMOVE(untagged_q, scb, links.tqe);
5722                                 break;
5723                         case SEARCH_COUNT:
5724                                 break;
5725                         }
5726                 }
5727         }
5728
5729         if (action == SEARCH_COMPLETE)
5730                 ahc_release_untagged_queues(ahc);
5731         return (found);
5732 }
5733
5734 int
5735 ahc_search_disc_list(struct ahc_softc *ahc, int target, char channel,
5736                      int lun, u_int tag, int stop_on_first, int remove,
5737                      int save_state)
5738 {
5739         struct  scb *scbp;
5740         u_int   next;
5741         u_int   prev;
5742         u_int   count;
5743         u_int   active_scb;
5744
5745         count = 0;
5746         next = ahc_inb(ahc, DISCONNECTED_SCBH);
5747         prev = SCB_LIST_NULL;
5748
5749         if (save_state) {
5750                 /* restore this when we're done */
5751                 active_scb = ahc_inb(ahc, SCBPTR);
5752         } else
5753                 /* Silence compiler */
5754                 active_scb = SCB_LIST_NULL;
5755
5756         while (next != SCB_LIST_NULL) {
5757                 u_int scb_index;
5758
5759                 ahc_outb(ahc, SCBPTR, next);
5760                 scb_index = ahc_inb(ahc, SCB_TAG);
5761                 if (scb_index >= ahc->scb_data->numscbs) {
5762                         printf("Disconnected List inconsistency. "
5763                                "SCB index == %d, yet numscbs == %d.",
5764                                scb_index, ahc->scb_data->numscbs);
5765                         ahc_dump_card_state(ahc);
5766                         panic("for safety");
5767                 }
5768
5769                 if (next == prev) {
5770                         panic("Disconnected List Loop. "
5771                               "cur SCBPTR == %x, prev SCBPTR == %x.",
5772                               next, prev);
5773                 }
5774                 scbp = ahc_lookup_scb(ahc, scb_index);
5775                 if (ahc_match_scb(ahc, scbp, target, channel, lun,
5776                                   tag, ROLE_INITIATOR)) {
5777                         count++;
5778                         if (remove) {
5779                                 next =
5780                                     ahc_rem_scb_from_disc_list(ahc, prev, next);
5781                         } else {
5782                                 prev = next;
5783                                 next = ahc_inb(ahc, SCB_NEXT);
5784                         }
5785                         if (stop_on_first)
5786                                 break;
5787                 } else {
5788                         prev = next;
5789                         next = ahc_inb(ahc, SCB_NEXT);
5790                 }
5791         }
5792         if (save_state)
5793                 ahc_outb(ahc, SCBPTR, active_scb);
5794         return (count);
5795 }
5796
5797 /*
5798  * Remove an SCB from the on chip list of disconnected transactions.
5799  * This is empty/unused if we are not performing SCB paging.
5800  */
5801 static u_int
5802 ahc_rem_scb_from_disc_list(struct ahc_softc *ahc, u_int prev, u_int scbptr)
5803 {
5804         u_int next;
5805
5806         ahc_outb(ahc, SCBPTR, scbptr);
5807         next = ahc_inb(ahc, SCB_NEXT);
5808
5809         ahc_outb(ahc, SCB_CONTROL, 0);
5810
5811         ahc_add_curscb_to_free_list(ahc);
5812
5813         if (prev != SCB_LIST_NULL) {
5814                 ahc_outb(ahc, SCBPTR, prev);
5815                 ahc_outb(ahc, SCB_NEXT, next);
5816         } else
5817                 ahc_outb(ahc, DISCONNECTED_SCBH, next);
5818
5819         return (next);
5820 }
5821
5822 /*
5823  * Add the SCB as selected by SCBPTR onto the on chip list of
5824  * free hardware SCBs.  This list is empty/unused if we are not
5825  * performing SCB paging.
5826  */
5827 static void
5828 ahc_add_curscb_to_free_list(struct ahc_softc *ahc)
5829 {
5830         /*
5831          * Invalidate the tag so that our abort
5832          * routines don't think it's active.
5833          */
5834         ahc_outb(ahc, SCB_TAG, SCB_LIST_NULL);
5835
5836         if ((ahc->flags & AHC_PAGESCBS) != 0) {
5837                 ahc_outb(ahc, SCB_NEXT, ahc_inb(ahc, FREE_SCBH));
5838                 ahc_outb(ahc, FREE_SCBH, ahc_inb(ahc, SCBPTR));
5839         }
5840 }
5841
5842 /*
5843  * Manipulate the waiting for selection list and return the
5844  * scb that follows the one that we remove.
5845  */
5846 static u_int
5847 ahc_rem_wscb(struct ahc_softc *ahc, u_int scbpos, u_int prev)
5848 {
5849         u_int curscb, next;
5850
5851         /*
5852          * Select the SCB we want to abort and
5853          * pull the next pointer out of it.
5854          */
5855         curscb = ahc_inb(ahc, SCBPTR);
5856         ahc_outb(ahc, SCBPTR, scbpos);
5857         next = ahc_inb(ahc, SCB_NEXT);
5858
5859         /* Clear the necessary fields */
5860         ahc_outb(ahc, SCB_CONTROL, 0);
5861
5862         ahc_add_curscb_to_free_list(ahc);
5863
5864         /* update the waiting list */
5865         if (prev == SCB_LIST_NULL) {
5866                 /* First in the list */
5867                 ahc_outb(ahc, WAITING_SCBH, next);
5868
5869                 /*
5870                  * Ensure we aren't attempting to perform
5871                  * selection for this entry.
5872                  */
5873                 ahc_outb(ahc, SCSISEQ, (ahc_inb(ahc, SCSISEQ) & ~ENSELO));
5874         } else {
5875                 /*
5876                  * Select the scb that pointed to us
5877                  * and update its next pointer.
5878                  */
5879                 ahc_outb(ahc, SCBPTR, prev);
5880                 ahc_outb(ahc, SCB_NEXT, next);
5881         }
5882
5883         /*
5884          * Point us back at the original scb position.
5885          */
5886         ahc_outb(ahc, SCBPTR, curscb);
5887         return next;
5888 }
5889
5890 /******************************** Error Handling ******************************/
5891 /*
5892  * Abort all SCBs that match the given description (target/channel/lun/tag),
5893  * setting their status to the passed in status if the status has not already
5894  * been modified from CAM_REQ_INPROG.  This routine assumes that the sequencer
5895  * is paused before it is called.
5896  */
5897 int
5898 ahc_abort_scbs(struct ahc_softc *ahc, int target, char channel,
5899                int lun, u_int tag, role_t role, uint32_t status)
5900 {
5901         struct  scb *scbp;
5902         struct  scb *scbp_next;
5903         u_int   active_scb;
5904         int     i, j;
5905         int     maxtarget;
5906         int     minlun;
5907         int     maxlun;
5908
5909         int     found;
5910
5911         /*
5912          * Don't attempt to run any queued untagged transactions
5913          * until we are done with the abort process.
5914          */
5915         ahc_freeze_untagged_queues(ahc);
5916
5917         /* restore this when we're done */
5918         active_scb = ahc_inb(ahc, SCBPTR);
5919
5920         found = ahc_search_qinfifo(ahc, target, channel, lun, SCB_LIST_NULL,
5921                                    role, CAM_REQUEUE_REQ, SEARCH_COMPLETE);
5922
5923         /*
5924          * Clean out the busy target table for any untagged commands.
5925          */
5926         i = 0;
5927         maxtarget = 16;
5928         if (target != CAM_TARGET_WILDCARD) {
5929                 i = target;
5930                 if (channel == 'B')
5931                         i += 8;
5932                 maxtarget = i + 1;
5933         }
5934
5935         if (lun == CAM_LUN_WILDCARD) {
5936
5937                 /*
5938                  * Unless we are using an SCB based
5939                  * busy targets table, there is only
5940                  * one table entry for all luns of
5941                  * a target.
5942                  */
5943                 minlun = 0;
5944                 maxlun = 1;
5945                 if ((ahc->flags & AHC_SCB_BTT) != 0)
5946                         maxlun = AHC_NUM_LUNS;
5947         } else {
5948                 minlun = lun;
5949                 maxlun = lun + 1;
5950         }
5951
5952         if (role != ROLE_TARGET) {
5953                 for (;i < maxtarget; i++) {
5954                         for (j = minlun;j < maxlun; j++) {
5955                                 u_int scbid;
5956                                 u_int tcl;
5957
5958                                 tcl = BUILD_TCL(i << 4, j);
5959                                 scbid = ahc_index_busy_tcl(ahc, tcl);
5960                                 scbp = ahc_lookup_scb(ahc, scbid);
5961                                 if (scbp == NULL
5962                                  || ahc_match_scb(ahc, scbp, target, channel,
5963                                                   lun, tag, role) == 0)
5964                                         continue;
5965                                 ahc_unbusy_tcl(ahc, BUILD_TCL(i << 4, j));
5966                         }
5967                 }
5968
5969                 /*
5970                  * Go through the disconnected list and remove any entries we
5971                  * have queued for completion, 0'ing their control byte too.
5972                  * We save the active SCB and restore it ourselves, so there
5973                  * is no reason for this search to restore it too.
5974                  */
5975                 ahc_search_disc_list(ahc, target, channel, lun, tag,
5976                                      /*stop_on_first*/FALSE, /*remove*/TRUE,
5977                                      /*save_state*/FALSE);
5978         }
5979
5980         /*
5981          * Go through the hardware SCB array looking for commands that
5982          * were active but not on any list.  In some cases, these remnants
5983          * might not still have mappings in the scbindex array (e.g. unexpected
5984          * bus free with the same scb queued for an abort).  Don't hold this
5985          * against them.
5986          */
5987         for (i = 0; i < ahc->scb_data->maxhscbs; i++) {
5988                 u_int scbid;
5989
5990                 ahc_outb(ahc, SCBPTR, i);
5991                 scbid = ahc_inb(ahc, SCB_TAG);
5992                 scbp = ahc_lookup_scb(ahc, scbid);
5993                 if ((scbp == NULL && scbid != SCB_LIST_NULL)
5994                  || (scbp != NULL
5995                   && ahc_match_scb(ahc, scbp, target, channel, lun, tag, role)))
5996                         ahc_add_curscb_to_free_list(ahc);
5997         }
5998
5999         /*
6000          * Go through the pending CCB list and look for
6001          * commands for this target that are still active.
6002          * These are other tagged commands that were
6003          * disconnected when the reset occurred.
6004          */
6005         scbp_next = LIST_FIRST(&ahc->pending_scbs);
6006         while (scbp_next != NULL) {
6007                 scbp = scbp_next;
6008                 scbp_next = LIST_NEXT(scbp, pending_links);
6009                 if (ahc_match_scb(ahc, scbp, target, channel, lun, tag, role)) {
6010                         cam_status ostat;
6011
6012                         ostat = aic_get_transaction_status(scbp);
6013                         if (ostat == CAM_REQ_INPROG)
6014                                 aic_set_transaction_status(scbp, status);
6015                         if (aic_get_transaction_status(scbp) != CAM_REQ_CMP)
6016                                 aic_freeze_scb(scbp);
6017                         if ((scbp->flags & SCB_ACTIVE) == 0)
6018                                 printf("Inactive SCB on pending list\n");
6019                         ahc_done(ahc, scbp);
6020                         found++;
6021                 }
6022         }
6023         ahc_outb(ahc, SCBPTR, active_scb);
6024         ahc_platform_abort_scbs(ahc, target, channel, lun, tag, role, status);
6025         ahc_release_untagged_queues(ahc);
6026         return found;
6027 }
6028
6029 static void
6030 ahc_reset_current_bus(struct ahc_softc *ahc)
6031 {
6032         uint8_t scsiseq;
6033
6034         ahc_outb(ahc, SIMODE1, ahc_inb(ahc, SIMODE1) & ~ENSCSIRST);
6035         scsiseq = ahc_inb(ahc, SCSISEQ);
6036         ahc_outb(ahc, SCSISEQ, scsiseq | SCSIRSTO);
6037         ahc_flush_device_writes(ahc);
6038         aic_delay(AHC_BUSRESET_DELAY);
6039         /* Turn off the bus reset */
6040         ahc_outb(ahc, SCSISEQ, scsiseq & ~SCSIRSTO);
6041
6042         ahc_clear_intstat(ahc);
6043
6044         /* Re-enable reset interrupts */
6045         ahc_outb(ahc, SIMODE1, ahc_inb(ahc, SIMODE1) | ENSCSIRST);
6046 }
6047
6048 int
6049 ahc_reset_channel(struct ahc_softc *ahc, char channel, int initiate_reset)
6050 {
6051         struct  ahc_devinfo devinfo;
6052         u_int   initiator, target, max_scsiid;
6053         u_int   sblkctl;
6054         u_int   scsiseq;
6055         u_int   simode1;
6056         int     found;
6057         int     restart_needed;
6058         char    cur_channel;
6059
6060         ahc->pending_device = NULL;
6061
6062         ahc_compile_devinfo(&devinfo,
6063                             CAM_TARGET_WILDCARD,
6064                             CAM_TARGET_WILDCARD,
6065                             CAM_LUN_WILDCARD,
6066                             channel, ROLE_UNKNOWN);
6067         ahc_pause(ahc);
6068
6069         /* Make sure the sequencer is in a safe location. */
6070         ahc_clear_critical_section(ahc);
6071
6072         /*
6073          * Run our command complete fifos to ensure that we perform
6074          * completion processing on any commands that 'completed'
6075          * before the reset occurred.
6076          */
6077         ahc_run_qoutfifo(ahc);
6078 #ifdef AHC_TARGET_MODE
6079         /*
6080          * XXX - In Twin mode, the tqinfifo may have commands
6081          *       for an unaffected channel in it.  However, if
6082          *       we have run out of ATIO resources to drain that
6083          *       queue, we may not get them all out here.  Further,
6084          *       the blocked transactions for the reset channel
6085          *       should just be killed off, irrespecitve of whether
6086          *       we are blocked on ATIO resources.  Write a routine
6087          *       to compact the tqinfifo appropriately.
6088          */
6089         if ((ahc->flags & AHC_TARGETROLE) != 0) {
6090                 ahc_run_tqinfifo(ahc, /*paused*/TRUE);
6091         }
6092 #endif
6093
6094         /*
6095          * Reset the bus if we are initiating this reset
6096          */
6097         sblkctl = ahc_inb(ahc, SBLKCTL);
6098         cur_channel = 'A';
6099         if ((ahc->features & AHC_TWIN) != 0
6100          && ((sblkctl & SELBUSB) != 0))
6101             cur_channel = 'B';
6102         scsiseq = ahc_inb(ahc, SCSISEQ_TEMPLATE);
6103         if (cur_channel != channel) {
6104                 /* Case 1: Command for another bus is active
6105                  * Stealthily reset the other bus without
6106                  * upsetting the current bus.
6107                  */
6108                 ahc_outb(ahc, SBLKCTL, sblkctl ^ SELBUSB);
6109                 simode1 = ahc_inb(ahc, SIMODE1) & ~(ENBUSFREE|ENSCSIRST);
6110 #ifdef AHC_TARGET_MODE
6111                 /*
6112                  * Bus resets clear ENSELI, so we cannot
6113                  * defer re-enabling bus reset interrupts
6114                  * if we are in target mode.
6115                  */
6116                 if ((ahc->flags & AHC_TARGETROLE) != 0)
6117                         simode1 |= ENSCSIRST;
6118 #endif
6119                 ahc_outb(ahc, SIMODE1, simode1);
6120                 if (initiate_reset)
6121                         ahc_reset_current_bus(ahc);
6122                 ahc_clear_intstat(ahc);
6123                 ahc_outb(ahc, SCSISEQ, scsiseq & (ENSELI|ENRSELI|ENAUTOATNP));
6124                 ahc_outb(ahc, SBLKCTL, sblkctl);
6125                 restart_needed = FALSE;
6126         } else {
6127                 /* Case 2: A command from this bus is active or we're idle */
6128                 simode1 = ahc_inb(ahc, SIMODE1) & ~(ENBUSFREE|ENSCSIRST);
6129 #ifdef AHC_TARGET_MODE
6130                 /*
6131                  * Bus resets clear ENSELI, so we cannot
6132                  * defer re-enabling bus reset interrupts
6133                  * if we are in target mode.
6134                  */
6135                 if ((ahc->flags & AHC_TARGETROLE) != 0)
6136                         simode1 |= ENSCSIRST;
6137 #endif
6138                 ahc_outb(ahc, SIMODE1, simode1);
6139                 if (initiate_reset)
6140                         ahc_reset_current_bus(ahc);
6141                 ahc_clear_intstat(ahc);
6142                 ahc_outb(ahc, SCSISEQ, scsiseq & (ENSELI|ENRSELI|ENAUTOATNP));
6143                 restart_needed = TRUE;
6144         }
6145
6146         /*
6147          * Clean up all the state information for the
6148          * pending transactions on this bus.
6149          */
6150         found = ahc_abort_scbs(ahc, CAM_TARGET_WILDCARD, channel,
6151                                CAM_LUN_WILDCARD, SCB_LIST_NULL,
6152                                ROLE_UNKNOWN, CAM_SCSI_BUS_RESET);
6153
6154         max_scsiid = (ahc->features & AHC_WIDE) ? 15 : 7;
6155
6156 #ifdef AHC_TARGET_MODE
6157         /*
6158          * Send an immediate notify ccb to all target more peripheral
6159          * drivers affected by this action.
6160          */
6161         for (target = 0; target <= max_scsiid; target++) {
6162                 struct ahc_tmode_tstate* tstate;
6163                 u_int lun;
6164
6165                 tstate = ahc->enabled_targets[target];
6166                 if (tstate == NULL)
6167                         continue;
6168                 for (lun = 0; lun < AHC_NUM_LUNS; lun++) {
6169                         struct ahc_tmode_lstate* lstate;
6170
6171                         lstate = tstate->enabled_luns[lun];
6172                         if (lstate == NULL)
6173                                 continue;
6174
6175                         ahc_queue_lstate_event(ahc, lstate, CAM_TARGET_WILDCARD,
6176                                                EVENT_TYPE_BUS_RESET, /*arg*/0);
6177                         ahc_send_lstate_events(ahc, lstate);
6178                 }
6179         }
6180 #endif
6181         /* Notify the XPT that a bus reset occurred */
6182         ahc_send_async(ahc, devinfo.channel, CAM_TARGET_WILDCARD,
6183                        CAM_LUN_WILDCARD, AC_BUS_RESET, NULL);
6184
6185         /*
6186          * Revert to async/narrow transfers until we renegotiate.
6187          */
6188         for (target = 0; target <= max_scsiid; target++) {
6189
6190                 if (ahc->enabled_targets[target] == NULL)
6191                         continue;
6192                 for (initiator = 0; initiator <= max_scsiid; initiator++) {
6193                         struct ahc_devinfo devinfo;
6194
6195                         ahc_compile_devinfo(&devinfo, target, initiator,
6196                                             CAM_LUN_WILDCARD,
6197                                             channel, ROLE_UNKNOWN);
6198                         ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
6199                                       AHC_TRANS_CUR, /*paused*/TRUE);
6200                         ahc_set_syncrate(ahc, &devinfo, /*syncrate*/NULL,
6201                                          /*period*/0, /*offset*/0,
6202                                          /*ppr_options*/0, AHC_TRANS_CUR,
6203                                          /*paused*/TRUE);
6204                 }
6205         }
6206
6207         if (restart_needed)
6208                 ahc_restart(ahc);
6209         else
6210                 ahc_unpause(ahc);
6211         return found;
6212 }
6213
6214
6215 /***************************** Residual Processing ****************************/
6216 /*
6217  * Calculate the residual for a just completed SCB.
6218  */
6219 void
6220 ahc_calc_residual(struct ahc_softc *ahc, struct scb *scb)
6221 {
6222         struct hardware_scb *hscb;
6223         struct status_pkt *spkt;
6224         uint32_t sgptr;
6225         uint32_t resid_sgptr;
6226         uint32_t resid;
6227
6228         /*
6229          * 5 cases.
6230          * 1) No residual.
6231          *    SG_RESID_VALID clear in sgptr.
6232          * 2) Transferless command
6233          * 3) Never performed any transfers.
6234          *    sgptr has SG_FULL_RESID set.
6235          * 4) No residual but target did not
6236          *    save data pointers after the
6237          *    last transfer, so sgptr was
6238          *    never updated.
6239          * 5) We have a partial residual.
6240          *    Use residual_sgptr to determine
6241          *    where we are.
6242          */
6243
6244         hscb = scb->hscb;
6245         sgptr = aic_le32toh(hscb->sgptr);
6246         if ((sgptr & SG_RESID_VALID) == 0)
6247                 /* Case 1 */
6248                 return;
6249         sgptr &= ~SG_RESID_VALID;
6250
6251         if ((sgptr & SG_LIST_NULL) != 0)
6252                 /* Case 2 */
6253                 return;
6254
6255         spkt = &hscb->shared_data.status;
6256         resid_sgptr = aic_le32toh(spkt->residual_sg_ptr);
6257         if ((sgptr & SG_FULL_RESID) != 0) {
6258                 /* Case 3 */
6259                 resid = aic_get_transfer_length(scb);
6260         } else if ((resid_sgptr & SG_LIST_NULL) != 0) {
6261                 /* Case 4 */
6262                 return;
6263         } else if ((resid_sgptr & ~SG_PTR_MASK) != 0) {
6264                 panic("Bogus resid sgptr value 0x%x\n", resid_sgptr);
6265                 /* NOTREACHED */
6266                 return;
6267         } else {
6268                 struct ahc_dma_seg *sg;
6269
6270                 /*
6271                  * Remainder of the SG where the transfer
6272                  * stopped.
6273                  */
6274                 resid = aic_le32toh(spkt->residual_datacnt) & AHC_SG_LEN_MASK;
6275                 sg = ahc_sg_bus_to_virt(scb, resid_sgptr & SG_PTR_MASK);
6276
6277                 /* The residual sg_ptr always points to the next sg */
6278                 sg--;
6279
6280                 /*
6281                  * Add up the contents of all residual
6282                  * SG segments that are after the SG where
6283                  * the transfer stopped.
6284                  */
6285                 while ((aic_le32toh(sg->len) & AHC_DMA_LAST_SEG) == 0) {
6286                         sg++;
6287                         resid += aic_le32toh(sg->len) & AHC_SG_LEN_MASK;
6288                 }
6289         }
6290         if ((scb->flags & SCB_SENSE) == 0)
6291                 aic_set_residual(scb, resid);
6292         else
6293                 aic_set_sense_residual(scb, resid);
6294
6295 #ifdef AHC_DEBUG
6296         if ((ahc_debug & AHC_SHOW_MISC) != 0) {
6297                 ahc_print_path(ahc, scb);
6298                 printf("Handled %sResidual of %d bytes\n",
6299                        (scb->flags & SCB_SENSE) ? "Sense " : "", resid);
6300         }
6301 #endif
6302 }
6303
6304 /******************************* Target Mode **********************************/
6305 #ifdef AHC_TARGET_MODE
6306 /*
6307  * Add a target mode event to this lun's queue
6308  */
6309 static void
6310 ahc_queue_lstate_event(struct ahc_softc *ahc, struct ahc_tmode_lstate *lstate,
6311                        u_int initiator_id, u_int event_type, u_int event_arg)
6312 {
6313         struct ahc_tmode_event *event;
6314         int pending;
6315
6316         xpt_freeze_devq(lstate->path, /*count*/1);
6317         if (lstate->event_w_idx >= lstate->event_r_idx)
6318                 pending = lstate->event_w_idx - lstate->event_r_idx;
6319         else
6320                 pending = AHC_TMODE_EVENT_BUFFER_SIZE + 1
6321                         - (lstate->event_r_idx - lstate->event_w_idx);
6322
6323         if (event_type == EVENT_TYPE_BUS_RESET
6324          || event_type == MSG_BUS_DEV_RESET) {
6325                 /*
6326                  * Any earlier events are irrelevant, so reset our buffer.
6327                  * This has the effect of allowing us to deal with reset
6328                  * floods (an external device holding down the reset line)
6329                  * without losing the event that is really interesting.
6330                  */
6331                 lstate->event_r_idx = 0;
6332                 lstate->event_w_idx = 0;
6333                 xpt_release_devq(lstate->path, pending, /*runqueue*/FALSE);
6334         }
6335
6336         if (pending == AHC_TMODE_EVENT_BUFFER_SIZE) {
6337                 xpt_print_path(lstate->path);
6338                 printf("immediate event %x:%x lost\n",
6339                        lstate->event_buffer[lstate->event_r_idx].event_type,
6340                        lstate->event_buffer[lstate->event_r_idx].event_arg);
6341                 lstate->event_r_idx++;
6342                 if (lstate->event_r_idx == AHC_TMODE_EVENT_BUFFER_SIZE)
6343                         lstate->event_r_idx = 0;
6344                 xpt_release_devq(lstate->path, /*count*/1, /*runqueue*/FALSE);
6345         }
6346
6347         event = &lstate->event_buffer[lstate->event_w_idx];
6348         event->initiator_id = initiator_id;
6349         event->event_type = event_type;
6350         event->event_arg = event_arg;
6351         lstate->event_w_idx++;
6352         if (lstate->event_w_idx == AHC_TMODE_EVENT_BUFFER_SIZE)
6353                 lstate->event_w_idx = 0;
6354 }
6355
6356 /*
6357  * Send any target mode events queued up waiting
6358  * for immediate notify resources.
6359  */
6360 void
6361 ahc_send_lstate_events(struct ahc_softc *ahc, struct ahc_tmode_lstate *lstate)
6362 {
6363         struct ccb_hdr *ccbh;
6364         struct ccb_immediate_notify *inot;
6365
6366         while (lstate->event_r_idx != lstate->event_w_idx
6367             && (ccbh = SLIST_FIRST(&lstate->immed_notifies)) != NULL) {
6368                 struct ahc_tmode_event *event;
6369
6370                 event = &lstate->event_buffer[lstate->event_r_idx];
6371                 SLIST_REMOVE_HEAD(&lstate->immed_notifies, sim_links.sle);
6372                 inot = (struct ccb_immediate_notify *)ccbh;
6373                 switch (event->event_type) {
6374                 case EVENT_TYPE_BUS_RESET:
6375                         ccbh->status = CAM_SCSI_BUS_RESET|CAM_DEV_QFRZN;
6376                         break;
6377                 default:
6378                         ccbh->status = CAM_MESSAGE_RECV|CAM_DEV_QFRZN;
6379                         inot->arg = event->event_type;
6380                         inot->seq_id = event->event_arg;
6381                         break;
6382                 }
6383                 inot->initiator_id = event->initiator_id;
6384                 xpt_done((union ccb *)inot);
6385                 lstate->event_r_idx++;
6386                 if (lstate->event_r_idx == AHC_TMODE_EVENT_BUFFER_SIZE)
6387                         lstate->event_r_idx = 0;
6388         }
6389 }
6390 #endif
6391
6392 /******************** Sequencer Program Patching/Download *********************/
6393
6394 #ifdef AHC_DUMP_SEQ
6395 void
6396 ahc_dumpseq(struct ahc_softc* ahc)
6397 {
6398         int i;
6399
6400         ahc_outb(ahc, SEQCTL, PERRORDIS|FAILDIS|FASTMODE|LOADRAM);
6401         ahc_outb(ahc, SEQADDR0, 0);
6402         ahc_outb(ahc, SEQADDR1, 0);
6403         for (i = 0; i < ahc->instruction_ram_size; i++) {
6404                 uint8_t ins_bytes[4];
6405
6406                 ahc_insb(ahc, SEQRAM, ins_bytes, 4);
6407                 printf("0x%08x\n", ins_bytes[0] << 24
6408                                  | ins_bytes[1] << 16
6409                                  | ins_bytes[2] << 8
6410                                  | ins_bytes[3]);
6411         }
6412 }
6413 #endif
6414
6415 static int
6416 ahc_loadseq(struct ahc_softc *ahc)
6417 {
6418         struct  cs cs_table[num_critical_sections];
6419         u_int   begin_set[num_critical_sections];
6420         u_int   end_set[num_critical_sections];
6421         struct  patch *cur_patch;
6422         u_int   cs_count;
6423         u_int   cur_cs;
6424         u_int   i;
6425         u_int   skip_addr;
6426         u_int   sg_prefetch_cnt;
6427         int     downloaded;
6428         uint8_t download_consts[7];
6429
6430         /*
6431          * Start out with 0 critical sections
6432          * that apply to this firmware load.
6433          */
6434         cs_count = 0;
6435         cur_cs = 0;
6436         memset(begin_set, 0, sizeof(begin_set));
6437         memset(end_set, 0, sizeof(end_set));
6438
6439         /* Setup downloadable constant table */
6440         download_consts[QOUTFIFO_OFFSET] = 0;
6441         if (ahc->targetcmds != NULL)
6442                 download_consts[QOUTFIFO_OFFSET] += 32;
6443         download_consts[QINFIFO_OFFSET] = download_consts[QOUTFIFO_OFFSET] + 1;
6444         download_consts[CACHESIZE_MASK] = ahc->pci_cachesize - 1;
6445         download_consts[INVERTED_CACHESIZE_MASK] = ~(ahc->pci_cachesize - 1);
6446         sg_prefetch_cnt = ahc->pci_cachesize;
6447         if (sg_prefetch_cnt < (2 * sizeof(struct ahc_dma_seg)))
6448                 sg_prefetch_cnt = 2 * sizeof(struct ahc_dma_seg);
6449         download_consts[SG_PREFETCH_CNT] = sg_prefetch_cnt;
6450         download_consts[SG_PREFETCH_ALIGN_MASK] = ~(sg_prefetch_cnt - 1);
6451         download_consts[SG_PREFETCH_ADDR_MASK] = (sg_prefetch_cnt - 1);
6452
6453         cur_patch = patches;
6454         downloaded = 0;
6455         skip_addr = 0;
6456         ahc_outb(ahc, SEQCTL, PERRORDIS|FAILDIS|FASTMODE|LOADRAM);
6457         ahc_outb(ahc, SEQADDR0, 0);
6458         ahc_outb(ahc, SEQADDR1, 0);
6459
6460         for (i = 0; i < sizeof(seqprog)/4; i++) {
6461                 if (ahc_check_patch(ahc, &cur_patch, i, &skip_addr) == 0) {
6462                         /*
6463                          * Don't download this instruction as it
6464                          * is in a patch that was removed.
6465                          */
6466                         continue;
6467                 }
6468
6469                 if (downloaded == ahc->instruction_ram_size) {
6470                         /*
6471                          * We're about to exceed the instruction
6472                          * storage capacity for this chip.  Fail
6473                          * the load.
6474                          */
6475                         printf("\n%s: Program too large for instruction memory "
6476                                "size of %d!\n", ahc_name(ahc),
6477                                ahc->instruction_ram_size);
6478                         return (ENOMEM);
6479                 }
6480
6481                 /*
6482                  * Move through the CS table until we find a CS
6483                  * that might apply to this instruction.
6484                  */
6485                 for (; cur_cs < num_critical_sections; cur_cs++) {
6486                         if (critical_sections[cur_cs].end <= i) {
6487                                 if (begin_set[cs_count] == TRUE
6488                                  && end_set[cs_count] == FALSE) {
6489                                         cs_table[cs_count].end = downloaded;
6490                                         end_set[cs_count] = TRUE;
6491                                         cs_count++;
6492                                 }
6493                                 continue;
6494                         }
6495                         if (critical_sections[cur_cs].begin <= i
6496                          && begin_set[cs_count] == FALSE) {
6497                                 cs_table[cs_count].begin = downloaded;
6498                                 begin_set[cs_count] = TRUE;
6499                         }
6500                         break;
6501                 }
6502                 ahc_download_instr(ahc, i, download_consts);
6503                 downloaded++;
6504         }
6505
6506         ahc->num_critical_sections = cs_count;
6507         if (cs_count != 0) {
6508
6509                 cs_count *= sizeof(struct cs);
6510                 ahc->critical_sections = malloc(cs_count, M_DEVBUF, M_NOWAIT);
6511                 if (ahc->critical_sections == NULL)
6512                         panic("ahc_loadseq: Could not malloc");
6513                 memcpy(ahc->critical_sections, cs_table, cs_count);
6514         }
6515         ahc_outb(ahc, SEQCTL, PERRORDIS|FAILDIS|FASTMODE);
6516
6517         if (bootverbose) {
6518                 printf(" %d instructions downloaded\n", downloaded);
6519                 printf("%s: Features 0x%x, Bugs 0x%x, Flags 0x%x\n",
6520                        ahc_name(ahc), ahc->features, ahc->bugs, ahc->flags);
6521         }
6522         return (0);
6523 }
6524
6525 static int
6526 ahc_check_patch(struct ahc_softc *ahc, struct patch **start_patch,
6527                 u_int start_instr, u_int *skip_addr)
6528 {
6529         struct  patch *cur_patch;
6530         struct  patch *last_patch;
6531         u_int   num_patches;
6532
6533         num_patches = sizeof(patches)/sizeof(struct patch);
6534         last_patch = &patches[num_patches];
6535         cur_patch = *start_patch;
6536
6537         while (cur_patch < last_patch && start_instr == cur_patch->begin) {
6538
6539                 if (cur_patch->patch_func(ahc) == 0) {
6540
6541                         /* Start rejecting code */
6542                         *skip_addr = start_instr + cur_patch->skip_instr;
6543                         cur_patch += cur_patch->skip_patch;
6544                 } else {
6545                         /* Accepted this patch.  Advance to the next
6546                          * one and wait for our instruction pointer to
6547                          * hit this point.
6548                          */
6549                         cur_patch++;
6550                 }
6551         }
6552
6553         *start_patch = cur_patch;
6554         if (start_instr < *skip_addr)
6555                 /* Still skipping */
6556                 return (0);
6557
6558         return (1);
6559 }
6560
6561 static void
6562 ahc_download_instr(struct ahc_softc *ahc, u_int instrptr, uint8_t *dconsts)
6563 {
6564         union   ins_formats instr;
6565         struct  ins_format1 *fmt1_ins;
6566         struct  ins_format3 *fmt3_ins;
6567         u_int   opcode;
6568
6569         /*
6570          * The firmware is always compiled into a little endian format.
6571          */
6572         instr.integer = aic_le32toh(*(uint32_t*)&seqprog[instrptr * 4]);
6573
6574         fmt1_ins = &instr.format1;
6575         fmt3_ins = NULL;
6576
6577         /* Pull the opcode */
6578         opcode = instr.format1.opcode;
6579         switch (opcode) {
6580         case AIC_OP_JMP:
6581         case AIC_OP_JC:
6582         case AIC_OP_JNC:
6583         case AIC_OP_CALL:
6584         case AIC_OP_JNE:
6585         case AIC_OP_JNZ:
6586         case AIC_OP_JE:
6587         case AIC_OP_JZ:
6588         {
6589                 struct patch *cur_patch;
6590                 int address_offset;
6591                 u_int address;
6592                 u_int skip_addr;
6593                 u_int i;
6594
6595                 fmt3_ins = &instr.format3;
6596                 address_offset = 0;
6597                 address = fmt3_ins->address;
6598                 cur_patch = patches;
6599                 skip_addr = 0;
6600
6601                 for (i = 0; i < address;) {
6602
6603                         ahc_check_patch(ahc, &cur_patch, i, &skip_addr);
6604
6605                         if (skip_addr > i) {
6606                                 int end_addr;
6607
6608                                 end_addr = MIN(address, skip_addr);
6609                                 address_offset += end_addr - i;
6610                                 i = skip_addr;
6611                         } else {
6612                                 i++;
6613                         }
6614                 }
6615                 address -= address_offset;
6616                 fmt3_ins->address = address;
6617                 /* FALLTHROUGH */
6618         }
6619         case AIC_OP_OR:
6620         case AIC_OP_AND:
6621         case AIC_OP_XOR:
6622         case AIC_OP_ADD:
6623         case AIC_OP_ADC:
6624         case AIC_OP_BMOV:
6625                 if (fmt1_ins->parity != 0) {
6626                         fmt1_ins->immediate = dconsts[fmt1_ins->immediate];
6627                 }
6628                 fmt1_ins->parity = 0;
6629                 if ((ahc->features & AHC_CMD_CHAN) == 0
6630                  && opcode == AIC_OP_BMOV) {
6631                         /*
6632                          * Block move was added at the same time
6633                          * as the command channel.  Verify that
6634                          * this is only a move of a single element
6635                          * and convert the BMOV to a MOV
6636                          * (AND with an immediate of FF).
6637                          */
6638                         if (fmt1_ins->immediate != 1)
6639                                 panic("%s: BMOV not supported\n",
6640                                       ahc_name(ahc));
6641                         fmt1_ins->opcode = AIC_OP_AND;
6642                         fmt1_ins->immediate = 0xff;
6643                 }
6644                 /* FALLTHROUGH */
6645         case AIC_OP_ROL:
6646                 if ((ahc->features & AHC_ULTRA2) != 0) {
6647                         int i, count;
6648
6649                         /* Calculate odd parity for the instruction */
6650                         for (i = 0, count = 0; i < 31; i++) {
6651                                 uint32_t mask;
6652
6653                                 mask = 0x01 << i;
6654                                 if ((instr.integer & mask) != 0)
6655                                         count++;
6656                         }
6657                         if ((count & 0x01) == 0)
6658                                 instr.format1.parity = 1;
6659                 } else {
6660                         /* Compress the instruction for older sequencers */
6661                         if (fmt3_ins != NULL) {
6662                                 instr.integer =
6663                                         fmt3_ins->immediate
6664                                       | (fmt3_ins->source << 8)
6665                                       | (fmt3_ins->address << 16)
6666                                       | (fmt3_ins->opcode << 25);
6667                         } else {
6668                                 instr.integer =
6669                                         fmt1_ins->immediate
6670                                       | (fmt1_ins->source << 8)
6671                                       | (fmt1_ins->destination << 16)
6672                                       | (fmt1_ins->ret << 24)
6673                                       | (fmt1_ins->opcode << 25);
6674                         }
6675                 }
6676                 /* The sequencer is a little endian cpu */
6677                 instr.integer = aic_htole32(instr.integer);
6678                 ahc_outsb(ahc, SEQRAM, instr.bytes, 4);
6679                 break;
6680         default:
6681                 panic("Unknown opcode encountered in seq program");
6682                 break;
6683         }
6684 }
6685
6686 int
6687 ahc_print_register(ahc_reg_parse_entry_t *table, u_int num_entries,
6688                    const char *name, u_int address, u_int value,
6689                    u_int *cur_column, u_int wrap_point)
6690 {
6691         int     printed;
6692         u_int   printed_mask;
6693         u_int   dummy_column;
6694
6695         if (cur_column == NULL) {
6696                 dummy_column = 0;
6697                 cur_column = &dummy_column;
6698         }
6699
6700         if (*cur_column >= wrap_point) {
6701                 printf("\n");
6702                 *cur_column = 0;
6703         }
6704         printed = printf("%s[0x%x]", name, value);
6705         if (table == NULL) {
6706                 printed += printf(" ");
6707                 *cur_column += printed;
6708                 return (printed);
6709         }
6710         printed_mask = 0;
6711         while (printed_mask != 0xFF) {
6712                 int entry;
6713
6714                 for (entry = 0; entry < num_entries; entry++) {
6715                         if (((value & table[entry].mask)
6716                           != table[entry].value)
6717                          || ((printed_mask & table[entry].mask)
6718                           == table[entry].mask))
6719                                 continue;
6720
6721                         printed += printf("%s%s",
6722                                           printed_mask == 0 ? ":(" : "|",
6723                                           table[entry].name);
6724                         printed_mask |= table[entry].mask;
6725
6726                         break;
6727                 }
6728                 if (entry >= num_entries)
6729                         break;
6730         }
6731         if (printed_mask != 0)
6732                 printed += printf(") ");
6733         else
6734                 printed += printf(" ");
6735         if (cur_column != NULL)
6736                 *cur_column += printed;
6737         return (printed);
6738 }
6739
6740 void
6741 ahc_dump_card_state(struct ahc_softc *ahc)
6742 {
6743         struct  scb *scb;
6744         struct  scb_tailq *untagged_q;
6745         u_int   cur_col;
6746         int     paused;
6747         int     target;
6748         int     maxtarget;
6749         int     i;
6750         uint8_t last_phase;
6751         uint8_t qinpos;
6752         uint8_t qintail;
6753         uint8_t qoutpos;
6754         uint8_t scb_index;
6755         uint8_t saved_scbptr;
6756
6757         if (ahc_is_paused(ahc)) {
6758                 paused = 1;
6759         } else {
6760                 paused = 0;
6761                 ahc_pause(ahc);
6762         }
6763
6764         saved_scbptr = ahc_inb(ahc, SCBPTR);
6765         last_phase = ahc_inb(ahc, LASTPHASE);
6766         printf(">>>>>>>>>>>>>>>>>> Dump Card State Begins <<<<<<<<<<<<<<<<<\n"
6767                "%s: Dumping Card State %s, at SEQADDR 0x%x\n",
6768                ahc_name(ahc), ahc_lookup_phase_entry(last_phase)->phasemsg,
6769                ahc_inb(ahc, SEQADDR0) | (ahc_inb(ahc, SEQADDR1) << 8));
6770         if (paused)
6771                 printf("Card was paused\n");
6772         printf("ACCUM = 0x%x, SINDEX = 0x%x, DINDEX = 0x%x, ARG_2 = 0x%x\n",
6773                ahc_inb(ahc, ACCUM), ahc_inb(ahc, SINDEX), ahc_inb(ahc, DINDEX),
6774                ahc_inb(ahc, ARG_2));
6775         printf("HCNT = 0x%x SCBPTR = 0x%x\n", ahc_inb(ahc, HCNT),
6776                ahc_inb(ahc, SCBPTR));
6777         cur_col = 0;
6778         if ((ahc->features & AHC_DT) != 0)
6779                 ahc_scsiphase_print(ahc_inb(ahc, SCSIPHASE), &cur_col, 50);
6780         ahc_scsisigi_print(ahc_inb(ahc, SCSISIGI), &cur_col, 50);
6781         ahc_error_print(ahc_inb(ahc, ERROR), &cur_col, 50);
6782         ahc_scsibusl_print(ahc_inb(ahc, SCSIBUSL), &cur_col, 50);
6783         ahc_lastphase_print(ahc_inb(ahc, LASTPHASE), &cur_col, 50);
6784         ahc_scsiseq_print(ahc_inb(ahc, SCSISEQ), &cur_col, 50);
6785         ahc_sblkctl_print(ahc_inb(ahc, SBLKCTL), &cur_col, 50);
6786         ahc_scsirate_print(ahc_inb(ahc, SCSIRATE), &cur_col, 50);
6787         ahc_seqctl_print(ahc_inb(ahc, SEQCTL), &cur_col, 50);
6788         ahc_seq_flags_print(ahc_inb(ahc, SEQ_FLAGS), &cur_col, 50);
6789         ahc_sstat0_print(ahc_inb(ahc, SSTAT0), &cur_col, 50);
6790         ahc_sstat1_print(ahc_inb(ahc, SSTAT1), &cur_col, 50);
6791         ahc_sstat2_print(ahc_inb(ahc, SSTAT2), &cur_col, 50);
6792         ahc_sstat3_print(ahc_inb(ahc, SSTAT3), &cur_col, 50);
6793         ahc_simode0_print(ahc_inb(ahc, SIMODE0), &cur_col, 50);
6794         ahc_simode1_print(ahc_inb(ahc, SIMODE1), &cur_col, 50);
6795         ahc_sxfrctl0_print(ahc_inb(ahc, SXFRCTL0), &cur_col, 50);
6796         ahc_dfcntrl_print(ahc_inb(ahc, DFCNTRL), &cur_col, 50);
6797         ahc_dfstatus_print(ahc_inb(ahc, DFSTATUS), &cur_col, 50);
6798         if (cur_col != 0)
6799                 printf("\n");
6800         printf("STACK:");
6801         for (i = 0; i < STACK_SIZE; i++)
6802                printf(" 0x%x", ahc_inb(ahc, STACK)|(ahc_inb(ahc, STACK) << 8));
6803         printf("\nSCB count = %d\n", ahc->scb_data->numscbs);
6804         printf("Kernel NEXTQSCB = %d\n", ahc->next_queued_scb->hscb->tag);
6805         printf("Card NEXTQSCB = %d\n", ahc_inb(ahc, NEXT_QUEUED_SCB));
6806         /* QINFIFO */
6807         printf("QINFIFO entries: ");
6808         if ((ahc->features & AHC_QUEUE_REGS) != 0) {
6809                 qinpos = ahc_inb(ahc, SNSCB_QOFF);
6810                 ahc_outb(ahc, SNSCB_QOFF, qinpos);
6811         } else
6812                 qinpos = ahc_inb(ahc, QINPOS);
6813         qintail = ahc->qinfifonext;
6814         while (qinpos != qintail) {
6815                 printf("%d ", ahc->qinfifo[qinpos]);
6816                 qinpos++;
6817         }
6818         printf("\n");
6819
6820         printf("Waiting Queue entries: ");
6821         scb_index = ahc_inb(ahc, WAITING_SCBH);
6822         i = 0;
6823         while (scb_index != SCB_LIST_NULL && i++ < 256) {
6824                 ahc_outb(ahc, SCBPTR, scb_index);
6825                 printf("%d:%d ", scb_index, ahc_inb(ahc, SCB_TAG));
6826                 scb_index = ahc_inb(ahc, SCB_NEXT);
6827         }
6828         printf("\n");
6829
6830         printf("Disconnected Queue entries: ");
6831         scb_index = ahc_inb(ahc, DISCONNECTED_SCBH);
6832         i = 0;
6833         while (scb_index != SCB_LIST_NULL && i++ < 256) {
6834                 ahc_outb(ahc, SCBPTR, scb_index);
6835                 printf("%d:%d ", scb_index, ahc_inb(ahc, SCB_TAG));
6836                 scb_index = ahc_inb(ahc, SCB_NEXT);
6837         }
6838         printf("\n");
6839
6840         ahc_sync_qoutfifo(ahc, BUS_DMASYNC_POSTREAD);
6841         printf("QOUTFIFO entries: ");
6842         qoutpos = ahc->qoutfifonext;
6843         i = 0;
6844         while (ahc->qoutfifo[qoutpos] != SCB_LIST_NULL && i++ < 256) {
6845                 printf("%d ", ahc->qoutfifo[qoutpos]);
6846                 qoutpos++;
6847         }
6848         printf("\n");
6849
6850         printf("Sequencer Free SCB List: ");
6851         scb_index = ahc_inb(ahc, FREE_SCBH);
6852         i = 0;
6853         while (scb_index != SCB_LIST_NULL && i++ < 256) {
6854                 ahc_outb(ahc, SCBPTR, scb_index);
6855                 printf("%d ", scb_index);
6856                 scb_index = ahc_inb(ahc, SCB_NEXT);
6857         }
6858         printf("\n");
6859
6860         printf("Sequencer SCB Info: ");
6861         for (i = 0; i < ahc->scb_data->maxhscbs; i++) {
6862                 ahc_outb(ahc, SCBPTR, i);
6863                 cur_col = printf("\n%3d ", i);
6864
6865                 ahc_scb_control_print(ahc_inb(ahc, SCB_CONTROL), &cur_col, 60);
6866                 ahc_scb_scsiid_print(ahc_inb(ahc, SCB_SCSIID), &cur_col, 60);
6867                 ahc_scb_lun_print(ahc_inb(ahc, SCB_LUN), &cur_col, 60);
6868                 ahc_scb_tag_print(ahc_inb(ahc, SCB_TAG), &cur_col, 60);
6869         }
6870         printf("\n");
6871
6872         printf("Pending list: ");
6873         i = 0;
6874         LIST_FOREACH(scb, &ahc->pending_scbs, pending_links) {
6875                 if (i++ > 256)
6876                         break;
6877                 cur_col = printf("\n%3d ", scb->hscb->tag);
6878                 ahc_scb_control_print(scb->hscb->control, &cur_col, 60);
6879                 ahc_scb_scsiid_print(scb->hscb->scsiid, &cur_col, 60);
6880                 ahc_scb_lun_print(scb->hscb->lun, &cur_col, 60);
6881                 if ((ahc->flags & AHC_PAGESCBS) == 0) {
6882                         ahc_outb(ahc, SCBPTR, scb->hscb->tag);
6883                         printf("(");
6884                         ahc_scb_control_print(ahc_inb(ahc, SCB_CONTROL),
6885                                               &cur_col, 60);
6886                         ahc_scb_tag_print(ahc_inb(ahc, SCB_TAG), &cur_col, 60);
6887                         printf(")");
6888                 }
6889         }
6890         printf("\n");
6891
6892         printf("Kernel Free SCB list: ");
6893         i = 0;
6894         SLIST_FOREACH(scb, &ahc->scb_data->free_scbs, links.sle) {
6895                 if (i++ > 256)
6896                         break;
6897                 printf("%d ", scb->hscb->tag);
6898         }
6899         printf("\n");
6900
6901         maxtarget = (ahc->features & (AHC_WIDE|AHC_TWIN)) ? 15 : 7;
6902         for (target = 0; target <= maxtarget; target++) {
6903                 untagged_q = &ahc->untagged_queues[target];
6904                 if (TAILQ_FIRST(untagged_q) == NULL)
6905                         continue;
6906                 printf("Untagged Q(%d): ", target);
6907                 i = 0;
6908                 TAILQ_FOREACH(scb, untagged_q, links.tqe) {
6909                         if (i++ > 256)
6910                                 break;
6911                         printf("%d ", scb->hscb->tag);
6912                 }
6913                 printf("\n");
6914         }
6915
6916         ahc_platform_dump_card_state(ahc);
6917         printf("\n<<<<<<<<<<<<<<<<< Dump Card State Ends >>>>>>>>>>>>>>>>>>\n");
6918         ahc_outb(ahc, SCBPTR, saved_scbptr);
6919         if (paused == 0)
6920                 ahc_unpause(ahc);
6921 }
6922
6923 /*************************** Timeout Handling *********************************/
6924 void
6925 ahc_timeout(struct scb *scb)
6926 {
6927         struct ahc_softc *ahc;
6928
6929         ahc = scb->ahc_softc;
6930         if ((scb->flags & SCB_ACTIVE) != 0) {
6931                 if ((scb->flags & SCB_TIMEDOUT) == 0) {
6932                         LIST_INSERT_HEAD(&ahc->timedout_scbs, scb,
6933                                          timedout_links);
6934                         scb->flags |= SCB_TIMEDOUT;
6935                 }
6936                 ahc_wakeup_recovery_thread(ahc);
6937         }
6938 }
6939
6940 /*
6941  * Re-schedule a timeout for the passed in SCB if we determine that some
6942  * other SCB is in the process of recovery or an SCB with a longer
6943  * timeout is still pending.  Limit our search to just "other_scb"
6944  * if it is non-NULL.
6945  */
6946 static int
6947 ahc_other_scb_timeout(struct ahc_softc *ahc, struct scb *scb,
6948                       struct scb *other_scb)
6949 {
6950         u_int   newtimeout;
6951         int     found;
6952
6953         ahc_print_path(ahc, scb);
6954         printf("Other SCB Timeout%s",
6955                (scb->flags & SCB_OTHERTCL_TIMEOUT) != 0
6956                ? " again\n" : "\n");
6957
6958         newtimeout = aic_get_timeout(scb);
6959         scb->flags |= SCB_OTHERTCL_TIMEOUT;
6960         found = 0;
6961         if (other_scb != NULL) {
6962                 if ((other_scb->flags
6963                    & (SCB_OTHERTCL_TIMEOUT|SCB_TIMEDOUT)) == 0
6964                  || (other_scb->flags & SCB_RECOVERY_SCB) != 0) {
6965                         found++;
6966                         newtimeout = MAX(aic_get_timeout(other_scb),
6967                                          newtimeout);
6968                 }
6969         } else {
6970                 LIST_FOREACH(other_scb, &ahc->pending_scbs, pending_links) {
6971                         if ((other_scb->flags
6972                            & (SCB_OTHERTCL_TIMEOUT|SCB_TIMEDOUT)) == 0
6973                          || (other_scb->flags & SCB_RECOVERY_SCB) != 0) {
6974                                 found++;
6975                                 newtimeout =
6976                                     MAX(aic_get_timeout(other_scb),
6977                                         newtimeout);
6978                         }
6979                 }
6980         }
6981
6982         if (found != 0)
6983                 aic_scb_timer_reset(scb, newtimeout);
6984         else {
6985                 ahc_print_path(ahc, scb);
6986                 printf("No other SCB worth waiting for...\n");
6987         }
6988
6989         return (found != 0);
6990 }
6991
6992 /*
6993  * ahc_recover_commands determines if any of the commands that have currently
6994  * timedout are the root cause for this timeout.  Innocent commands are given
6995  * a new timeout while we wait for the command executing on the bus to timeout.
6996  * This routine is invoked from a thread context so we are allowed to sleep.
6997  * Our lock is not held on entry.
6998  */
6999 void
7000 ahc_recover_commands(struct ahc_softc *ahc)
7001 {
7002         struct  scb *scb;
7003         int     found;
7004         int     restart_needed;
7005         u_int   last_phase;
7006
7007         /*
7008          * Pause the controller and manually flush any
7009          * commands that have just completed but that our
7010          * interrupt handler has yet to see.
7011          */
7012         ahc_pause_and_flushwork(ahc);
7013
7014         if (LIST_EMPTY(&ahc->timedout_scbs) != 0) {
7015                 /*
7016                  * The timedout commands have already
7017                  * completed.  This typically means
7018                  * that either the timeout value was on
7019                  * the hairy edge of what the device
7020                  * requires or - more likely - interrupts
7021                  * are not happening.
7022                  */
7023                 printf("%s: Timedout SCBs already complete. "
7024                        "Interrupts may not be functioning.\n", ahc_name(ahc));
7025                 ahc_unpause(ahc);
7026                 return;
7027         }
7028
7029         restart_needed = 0;
7030         printf("%s: Recovery Initiated\n", ahc_name(ahc));
7031         ahc_dump_card_state(ahc);
7032
7033         last_phase = ahc_inb(ahc, LASTPHASE);
7034         while ((scb = LIST_FIRST(&ahc->timedout_scbs)) != NULL) {
7035                 u_int   active_scb_index;
7036                 u_int   saved_scbptr;
7037                 int     target;
7038                 int     lun;
7039                 int     i;
7040                 char    channel;
7041
7042                 target = SCB_GET_TARGET(ahc, scb);
7043                 channel = SCB_GET_CHANNEL(ahc, scb);
7044                 lun = SCB_GET_LUN(scb);
7045
7046                 ahc_print_path(ahc, scb);
7047                 printf("SCB 0x%x - timed out\n", scb->hscb->tag);
7048                 if (scb->sg_count > 0) {
7049                         for (i = 0; i < scb->sg_count; i++) {
7050                                 printf("sg[%d] - Addr 0x%x : Length %d\n",
7051                                        i,
7052                                        scb->sg_list[i].addr,
7053                                        scb->sg_list[i].len & AHC_SG_LEN_MASK);
7054                         }
7055                 }
7056                 if (scb->flags & (SCB_DEVICE_RESET|SCB_ABORT)) {
7057                         /*
7058                          * Been down this road before.
7059                          * Do a full bus reset.
7060                          */
7061                         aic_set_transaction_status(scb, CAM_CMD_TIMEOUT);
7062 bus_reset:
7063                         found = ahc_reset_channel(ahc, channel,
7064                                                   /*Initiate Reset*/TRUE);
7065                         printf("%s: Issued Channel %c Bus Reset. "
7066                                "%d SCBs aborted\n", ahc_name(ahc), channel,
7067                                found);
7068                         continue;
7069                 }
7070
7071                 /*
7072                  * Remove the command from the timedout list in
7073                  * preparation for requeing it.
7074                  */
7075                 LIST_REMOVE(scb, timedout_links);
7076                 scb->flags &= ~SCB_TIMEDOUT;
7077
7078                 /*
7079                  * If we are a target, transition to bus free and report
7080                  * the timeout.
7081                  *
7082                  * The target/initiator that is holding up the bus may not
7083                  * be the same as the one that triggered this timeout
7084                  * (different commands have different timeout lengths).
7085                  * If the bus is idle and we are actiing as the initiator
7086                  * for this request, queue a BDR message to the timed out
7087                  * target.  Otherwise, if the timed out transaction is
7088                  * active:
7089                  *   Initiator transaction:
7090                  *      Stuff the message buffer with a BDR message and assert
7091                  *      ATN in the hopes that the target will let go of the bus
7092                  *      and go to the mesgout phase.  If this fails, we'll
7093                  *      get another timeout 2 seconds later which will attempt
7094                  *      a bus reset.
7095                  *
7096                  *   Target transaction:
7097                  *      Transition to BUS FREE and report the error.
7098                  *      It's good to be the target!
7099                  */
7100                 saved_scbptr = ahc_inb(ahc, SCBPTR);
7101                 active_scb_index = ahc_inb(ahc, SCB_TAG);
7102
7103                 if ((ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0
7104                   && (active_scb_index < ahc->scb_data->numscbs)) {
7105                         struct scb *active_scb;
7106
7107                         /*
7108                          * If the active SCB is not us, assume that
7109                          * the active SCB has a longer timeout than
7110                          * the timedout SCB, and wait for the active
7111                          * SCB to timeout.
7112                          */
7113                         active_scb = ahc_lookup_scb(ahc, active_scb_index);
7114                         if (active_scb != scb) {
7115                                 if (ahc_other_scb_timeout(ahc, scb,
7116                                                           active_scb) == 0)
7117                                         goto bus_reset;
7118                                 continue;
7119                         }
7120
7121                         /* It's us */
7122                         if ((scb->flags & SCB_TARGET_SCB) != 0) {
7123
7124                                 /*
7125                                  * Send back any queued up transactions
7126                                  * and properly record the error condition.
7127                                  */
7128                                 ahc_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
7129                                                SCB_GET_CHANNEL(ahc, scb),
7130                                                SCB_GET_LUN(scb),
7131                                                scb->hscb->tag,
7132                                                ROLE_TARGET,
7133                                                CAM_CMD_TIMEOUT);
7134
7135                                 /* Will clear us from the bus */
7136                                 restart_needed = 1;
7137                                 break;
7138                         }
7139
7140                         ahc_set_recoveryscb(ahc, active_scb);
7141                         ahc_outb(ahc, MSG_OUT, HOST_MSG);
7142                         ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
7143                         ahc_print_path(ahc, active_scb);
7144                         printf("BDR message in message buffer\n");
7145                         active_scb->flags |= SCB_DEVICE_RESET;
7146                         aic_scb_timer_reset(scb, 2 * 1000);
7147                 } else if (last_phase != P_BUSFREE
7148                         && (ahc_inb(ahc, SSTAT1) & REQINIT) == 0) {
7149                         /*
7150                          * SCB is not identified, there
7151                          * is no pending REQ, and the sequencer
7152                          * has not seen a busfree.  Looks like
7153                          * a stuck connection waiting to
7154                          * go busfree.  Reset the bus.
7155                          */
7156                         printf("%s: Connection stuck awaiting busfree or "
7157                                "Identify Msg.\n", ahc_name(ahc));
7158                         goto bus_reset;
7159                 } else {
7160                         int      disconnected;
7161
7162                         if (last_phase != P_BUSFREE
7163                          && (ahc_inb(ahc, SSTAT0) & TARGET) != 0) {
7164                                 /* Hung target selection.  Goto busfree */
7165                                 printf("%s: Hung target selection\n",
7166                                        ahc_name(ahc));
7167                                 restart_needed = 1;
7168                                 break;
7169                         }
7170
7171                         /* XXX Shouldn't panic.  Just punt instead? */
7172                         if ((scb->flags & SCB_TARGET_SCB) != 0)
7173                                 panic("Timed-out target SCB but bus idle");
7174
7175                         if (ahc_search_qinfifo(ahc, target, channel, lun,
7176                                                scb->hscb->tag, ROLE_INITIATOR,
7177                                                /*status*/0, SEARCH_COUNT) > 0) {
7178                                 disconnected = FALSE;
7179                         } else {
7180                                 disconnected = TRUE;
7181                         }
7182
7183                         if (disconnected) {
7184
7185                                 ahc_set_recoveryscb(ahc, scb);
7186                                 /*
7187                                  * Actually re-queue this SCB in an attempt
7188                                  * to select the device before it reconnects.
7189                                  * In either case (selection or reselection),
7190                                  * we will now issue a target reset to the
7191                                  * timed-out device.
7192                                  *
7193                                  * Set the MK_MESSAGE control bit indicating
7194                                  * that we desire to send a message.  We
7195                                  * also set the disconnected flag since
7196                                  * in the paging case there is no guarantee
7197                                  * that our SCB control byte matches the
7198                                  * version on the card.  We don't want the
7199                                  * sequencer to abort the command thinking
7200                                  * an unsolicited reselection occurred.
7201                                  */
7202                                 scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
7203                                 scb->flags |= SCB_DEVICE_RESET;
7204
7205                                 /*
7206                                  * Remove any cached copy of this SCB in the
7207                                  * disconnected list in preparation for the
7208                                  * queuing of our abort SCB.  We use the
7209                                  * same element in the SCB, SCB_NEXT, for
7210                                  * both the qinfifo and the disconnected list.
7211                                  */
7212                                 ahc_search_disc_list(ahc, target, channel,
7213                                                      lun, scb->hscb->tag,
7214                                                      /*stop_on_first*/TRUE,
7215                                                      /*remove*/TRUE,
7216                                                      /*save_state*/FALSE);
7217
7218                                 /*
7219                                  * In the non-paging case, the sequencer will
7220                                  * never re-reference the in-core SCB.
7221                                  * To make sure we are notified during
7222                                  * reslection, set the MK_MESSAGE flag in
7223                                  * the card's copy of the SCB.
7224                                  */
7225                                 if ((ahc->flags & AHC_PAGESCBS) == 0) {
7226                                         ahc_outb(ahc, SCBPTR, scb->hscb->tag);
7227                                         ahc_outb(ahc, SCB_CONTROL,
7228                                                  ahc_inb(ahc, SCB_CONTROL)
7229                                                 | MK_MESSAGE);
7230                                 }
7231
7232                                 /*
7233                                  * Clear out any entries in the QINFIFO first
7234                                  * so we are the next SCB for this target
7235                                  * to run.
7236                                  */
7237                                 ahc_search_qinfifo(ahc,
7238                                                    SCB_GET_TARGET(ahc, scb),
7239                                                    channel, SCB_GET_LUN(scb),
7240                                                    SCB_LIST_NULL,
7241                                                    ROLE_INITIATOR,
7242                                                    CAM_REQUEUE_REQ,
7243                                                    SEARCH_COMPLETE);
7244                                 ahc_print_path(ahc, scb);
7245                                 printf("Queuing a BDR SCB\n");
7246                                 ahc_qinfifo_requeue_tail(ahc, scb);
7247                                 ahc_outb(ahc, SCBPTR, saved_scbptr);
7248                                 aic_scb_timer_reset(scb, 2 * 1000);
7249                         } else {
7250                                 /* Go "immediately" to the bus reset */
7251                                 /* This shouldn't happen */
7252                                 ahc_set_recoveryscb(ahc, scb);
7253                                 ahc_print_path(ahc, scb);
7254                                 printf("SCB %d: Immediate reset.  "
7255                                         "Flags = 0x%x\n", scb->hscb->tag,
7256                                         scb->flags);
7257                                 goto bus_reset;
7258                         }
7259                 }
7260                 break;
7261         }
7262
7263         /*
7264          * Any remaining SCBs were not the "culprit", so remove
7265          * them from the timeout list.  The timer for these commands
7266          * will be reset once the recovery SCB completes.
7267          */
7268         while ((scb = LIST_FIRST(&ahc->timedout_scbs)) != NULL) {
7269
7270                 LIST_REMOVE(scb, timedout_links);
7271                 scb->flags &= ~SCB_TIMEDOUT;
7272         }
7273
7274         if (restart_needed)
7275                 ahc_restart(ahc);
7276         else
7277                 ahc_unpause(ahc);
7278 }
7279
7280 /************************* Target Mode ****************************************/
7281 #ifdef AHC_TARGET_MODE
7282 cam_status
7283 ahc_find_tmode_devs(struct ahc_softc *ahc, struct cam_sim *sim, union ccb *ccb,
7284                     struct ahc_tmode_tstate **tstate,
7285                     struct ahc_tmode_lstate **lstate,
7286                     int notfound_failure)
7287 {
7288
7289         if ((ahc->features & AHC_TARGETMODE) == 0)
7290                 return (CAM_REQ_INVALID);
7291
7292         /*
7293          * Handle the 'black hole' device that sucks up
7294          * requests to unattached luns on enabled targets.
7295          */
7296         if (ccb->ccb_h.target_id == CAM_TARGET_WILDCARD
7297          && ccb->ccb_h.target_lun == CAM_LUN_WILDCARD) {
7298                 *tstate = NULL;
7299                 *lstate = ahc->black_hole;
7300         } else {
7301                 u_int max_id;
7302
7303                 max_id = (ahc->features & AHC_WIDE) ? 15 : 7;
7304                 if (ccb->ccb_h.target_id > max_id)
7305                         return (CAM_TID_INVALID);
7306
7307                 if (ccb->ccb_h.target_lun >= AHC_NUM_LUNS)
7308                         return (CAM_LUN_INVALID);
7309
7310                 *tstate = ahc->enabled_targets[ccb->ccb_h.target_id];
7311                 *lstate = NULL;
7312                 if (*tstate != NULL)
7313                         *lstate =
7314                             (*tstate)->enabled_luns[ccb->ccb_h.target_lun];
7315         }
7316
7317         if (notfound_failure != 0 && *lstate == NULL)
7318                 return (CAM_PATH_INVALID);
7319
7320         return (CAM_REQ_CMP);
7321 }
7322
7323 void
7324 ahc_handle_en_lun(struct ahc_softc *ahc, struct cam_sim *sim, union ccb *ccb)
7325 {
7326         struct     ahc_tmode_tstate *tstate;
7327         struct     ahc_tmode_lstate *lstate;
7328         struct     ccb_en_lun *cel;
7329         cam_status status;
7330         u_int      target;
7331         u_int      lun;
7332         u_int      target_mask;
7333         u_int      our_id;
7334         int        error;
7335         char       channel;
7336
7337         status = ahc_find_tmode_devs(ahc, sim, ccb, &tstate, &lstate,
7338                                      /*notfound_failure*/FALSE);
7339
7340         if (status != CAM_REQ_CMP) {
7341                 ccb->ccb_h.status = status;
7342                 return;
7343         }
7344
7345         if (cam_sim_bus(sim) == 0)
7346                 our_id = ahc->our_id;
7347         else
7348                 our_id = ahc->our_id_b;
7349
7350         if (ccb->ccb_h.target_id != our_id
7351          && ccb->ccb_h.target_id != CAM_TARGET_WILDCARD) {
7352                 /*
7353                  * our_id represents our initiator ID, or
7354                  * the ID of the first target to have an
7355                  * enabled lun in target mode.  There are
7356                  * two cases that may preclude enabling a
7357                  * target id other than our_id.
7358                  *
7359                  *   o our_id is for an active initiator role.
7360                  *     Since the hardware does not support
7361                  *     reselections to the initiator role at
7362                  *     anything other than our_id, and our_id
7363                  *     is used by the hardware to indicate the
7364                  *     ID to use for both select-out and
7365                  *     reselect-out operations, the only target
7366                  *     ID we can support in this mode is our_id.
7367                  *
7368                  *   o The MULTARGID feature is not available and
7369                  *     a previous target mode ID has been enabled.
7370                  */
7371                 if ((ahc->features & AHC_MULTIROLE) != 0) {
7372
7373                         if ((ahc->features & AHC_MULTI_TID) != 0
7374                          && (ahc->flags & AHC_INITIATORROLE) != 0) {
7375                                 /*
7376                                  * Only allow additional targets if
7377                                  * the initiator role is disabled.
7378                                  * The hardware cannot handle a re-select-in
7379                                  * on the initiator id during a re-select-out
7380                                  * on a different target id.
7381                                  */
7382                                 status = CAM_TID_INVALID;
7383                         } else if ((ahc->flags & AHC_INITIATORROLE) != 0
7384                                 || ahc->enabled_luns > 0) {
7385                                 /*
7386                                  * Only allow our target id to change
7387                                  * if the initiator role is not configured
7388                                  * and there are no enabled luns which
7389                                  * are attached to the currently registered
7390                                  * scsi id.
7391                                  */
7392                                 status = CAM_TID_INVALID;
7393                         }
7394                 } else if ((ahc->features & AHC_MULTI_TID) == 0
7395                         && ahc->enabled_luns > 0) {
7396
7397                         status = CAM_TID_INVALID;
7398                 }
7399         }
7400
7401         if (status != CAM_REQ_CMP) {
7402                 ccb->ccb_h.status = status;
7403                 return;
7404         }
7405
7406         /*
7407          * We now have an id that is valid.
7408          * If we aren't in target mode, switch modes.
7409          */
7410         if ((ahc->flags & AHC_TARGETROLE) == 0
7411          && ccb->ccb_h.target_id != CAM_TARGET_WILDCARD) {
7412                 ahc_flag saved_flags;
7413
7414                 printf("Configuring Target Mode\n");
7415                 if (LIST_FIRST(&ahc->pending_scbs) != NULL) {
7416                         ccb->ccb_h.status = CAM_BUSY;
7417                         return;
7418                 }
7419                 saved_flags = ahc->flags;
7420                 ahc->flags |= AHC_TARGETROLE;
7421                 if ((ahc->features & AHC_MULTIROLE) == 0)
7422                         ahc->flags &= ~AHC_INITIATORROLE;
7423                 ahc_pause(ahc);
7424                 error = ahc_loadseq(ahc);
7425                 if (error != 0) {
7426                         /*
7427                          * Restore original configuration and notify
7428                          * the caller that we cannot support target mode.
7429                          * Since the adapter started out in this
7430                          * configuration, the firmware load will succeed,
7431                          * so there is no point in checking ahc_loadseq's
7432                          * return value.
7433                          */
7434                         ahc->flags = saved_flags;
7435                         (void)ahc_loadseq(ahc);
7436                         ahc_restart(ahc);
7437                         ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
7438                         return;
7439                 }
7440                 ahc_restart(ahc);
7441         }
7442         cel = &ccb->cel;
7443         target = ccb->ccb_h.target_id;
7444         lun = ccb->ccb_h.target_lun;
7445         channel = SIM_CHANNEL(ahc, sim);
7446         target_mask = 0x01 << target;
7447         if (channel == 'B')
7448                 target_mask <<= 8;
7449
7450         if (cel->enable != 0) {
7451                 u_int scsiseq;
7452
7453                 /* Are we already enabled?? */
7454                 if (lstate != NULL) {
7455                         xpt_print_path(ccb->ccb_h.path);
7456                         printf("Lun already enabled\n");
7457                         ccb->ccb_h.status = CAM_LUN_ALRDY_ENA;
7458                         return;
7459                 }
7460
7461                 if (cel->grp6_len != 0
7462                  || cel->grp7_len != 0) {
7463                         /*
7464                          * Don't (yet?) support vendor
7465                          * specific commands.
7466                          */
7467                         ccb->ccb_h.status = CAM_REQ_INVALID;
7468                         printf("Non-zero Group Codes\n");
7469                         return;
7470                 }
7471
7472                 /*
7473                  * Seems to be okay.
7474                  * Setup our data structures.
7475                  */
7476                 if (target != CAM_TARGET_WILDCARD && tstate == NULL) {
7477                         tstate = ahc_alloc_tstate(ahc, target, channel);
7478                         if (tstate == NULL) {
7479                                 xpt_print_path(ccb->ccb_h.path);
7480                                 printf("Couldn't allocate tstate\n");
7481                                 ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
7482                                 return;
7483                         }
7484                 }
7485                 lstate = malloc(sizeof(*lstate), M_DEVBUF, M_NOWAIT);
7486                 if (lstate == NULL) {
7487                         xpt_print_path(ccb->ccb_h.path);
7488                         printf("Couldn't allocate lstate\n");
7489                         ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
7490                         return;
7491                 }
7492                 memset(lstate, 0, sizeof(*lstate));
7493                 status = xpt_create_path(&lstate->path, /*periph*/NULL,
7494                                          xpt_path_path_id(ccb->ccb_h.path),
7495                                          xpt_path_target_id(ccb->ccb_h.path),
7496                                          xpt_path_lun_id(ccb->ccb_h.path));
7497                 if (status != CAM_REQ_CMP) {
7498                         free(lstate, M_DEVBUF);
7499                         xpt_print_path(ccb->ccb_h.path);
7500                         printf("Couldn't allocate path\n");
7501                         ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
7502                         return;
7503                 }
7504                 SLIST_INIT(&lstate->accept_tios);
7505                 SLIST_INIT(&lstate->immed_notifies);
7506                 ahc_pause(ahc);
7507                 if (target != CAM_TARGET_WILDCARD) {
7508                         tstate->enabled_luns[lun] = lstate;
7509                         ahc->enabled_luns++;
7510
7511                         if ((ahc->features & AHC_MULTI_TID) != 0) {
7512                                 u_int targid_mask;
7513
7514                                 targid_mask = ahc_inb(ahc, TARGID)
7515                                             | (ahc_inb(ahc, TARGID + 1) << 8);
7516
7517                                 targid_mask |= target_mask;
7518                                 ahc_outb(ahc, TARGID, targid_mask);
7519                                 ahc_outb(ahc, TARGID+1, (targid_mask >> 8));
7520
7521                                 ahc_update_scsiid(ahc, targid_mask);
7522                         } else {
7523                                 u_int our_id;
7524                                 char  channel;
7525
7526                                 channel = SIM_CHANNEL(ahc, sim);
7527                                 our_id = SIM_SCSI_ID(ahc, sim);
7528
7529                                 /*
7530                                  * This can only happen if selections
7531                                  * are not enabled
7532                                  */
7533                                 if (target != our_id) {
7534                                         u_int sblkctl;
7535                                         char  cur_channel;
7536                                         int   swap;
7537
7538                                         sblkctl = ahc_inb(ahc, SBLKCTL);
7539                                         cur_channel = (sblkctl & SELBUSB)
7540                                                     ? 'B' : 'A';
7541                                         if ((ahc->features & AHC_TWIN) == 0)
7542                                                 cur_channel = 'A';
7543                                         swap = cur_channel != channel;
7544                                         if (channel == 'A')
7545                                                 ahc->our_id = target;
7546                                         else
7547                                                 ahc->our_id_b = target;
7548
7549                                         if (swap)
7550                                                 ahc_outb(ahc, SBLKCTL,
7551                                                          sblkctl ^ SELBUSB);
7552
7553                                         ahc_outb(ahc, SCSIID, target);
7554
7555                                         if (swap)
7556                                                 ahc_outb(ahc, SBLKCTL, sblkctl);
7557                                 }
7558                         }
7559                 } else
7560                         ahc->black_hole = lstate;
7561                 /* Allow select-in operations */
7562                 if (ahc->black_hole != NULL && ahc->enabled_luns > 0) {
7563                         scsiseq = ahc_inb(ahc, SCSISEQ_TEMPLATE);
7564                         scsiseq |= ENSELI;
7565                         ahc_outb(ahc, SCSISEQ_TEMPLATE, scsiseq);
7566                         scsiseq = ahc_inb(ahc, SCSISEQ);
7567                         scsiseq |= ENSELI;
7568                         ahc_outb(ahc, SCSISEQ, scsiseq);
7569                 }
7570                 ahc_unpause(ahc);
7571                 ccb->ccb_h.status = CAM_REQ_CMP;
7572                 xpt_print_path(ccb->ccb_h.path);
7573                 printf("Lun now enabled for target mode\n");
7574         } else {
7575                 struct scb *scb;
7576                 int i, empty;
7577
7578                 if (lstate == NULL) {
7579                         ccb->ccb_h.status = CAM_LUN_INVALID;
7580                         return;
7581                 }
7582
7583                 ccb->ccb_h.status = CAM_REQ_CMP;
7584                 LIST_FOREACH(scb, &ahc->pending_scbs, pending_links) {
7585                         struct ccb_hdr *ccbh;
7586
7587                         ccbh = &scb->io_ctx->ccb_h;
7588                         if (ccbh->func_code == XPT_CONT_TARGET_IO
7589                          && !xpt_path_comp(ccbh->path, ccb->ccb_h.path)){
7590                                 printf("CTIO pending\n");
7591                                 ccb->ccb_h.status = CAM_REQ_INVALID;
7592                                 return;
7593                         }
7594                 }
7595
7596                 if (SLIST_FIRST(&lstate->accept_tios) != NULL) {
7597                         printf("ATIOs pending\n");
7598                         ccb->ccb_h.status = CAM_REQ_INVALID;
7599                 }
7600
7601                 if (SLIST_FIRST(&lstate->immed_notifies) != NULL) {
7602                         printf("INOTs pending\n");
7603                         ccb->ccb_h.status = CAM_REQ_INVALID;
7604                 }
7605
7606                 if (ccb->ccb_h.status != CAM_REQ_CMP) {
7607                         return;
7608                 }
7609
7610                 xpt_print_path(ccb->ccb_h.path);
7611                 printf("Target mode disabled\n");
7612                 xpt_free_path(lstate->path);
7613                 free(lstate, M_DEVBUF);
7614
7615                 ahc_pause(ahc);
7616                 /* Can we clean up the target too? */
7617                 if (target != CAM_TARGET_WILDCARD) {
7618                         tstate->enabled_luns[lun] = NULL;
7619                         ahc->enabled_luns--;
7620                         for (empty = 1, i = 0; i < 8; i++)
7621                                 if (tstate->enabled_luns[i] != NULL) {
7622                                         empty = 0;
7623                                         break;
7624                                 }
7625
7626                         if (empty) {
7627                                 ahc_free_tstate(ahc, target, channel,
7628                                                 /*force*/FALSE);
7629                                 if (ahc->features & AHC_MULTI_TID) {
7630                                         u_int targid_mask;
7631
7632                                         targid_mask = ahc_inb(ahc, TARGID)
7633                                                     | (ahc_inb(ahc, TARGID + 1)
7634                                                        << 8);
7635
7636                                         targid_mask &= ~target_mask;
7637                                         ahc_outb(ahc, TARGID, targid_mask);
7638                                         ahc_outb(ahc, TARGID+1,
7639                                                  (targid_mask >> 8));
7640                                         ahc_update_scsiid(ahc, targid_mask);
7641                                 }
7642                         }
7643                 } else {
7644
7645                         ahc->black_hole = NULL;
7646
7647                         /*
7648                          * We can't allow selections without
7649                          * our black hole device.
7650                          */
7651                         empty = TRUE;
7652                 }
7653                 if (ahc->enabled_luns == 0) {
7654                         /* Disallow select-in */
7655                         u_int scsiseq;
7656
7657                         scsiseq = ahc_inb(ahc, SCSISEQ_TEMPLATE);
7658                         scsiseq &= ~ENSELI;
7659                         ahc_outb(ahc, SCSISEQ_TEMPLATE, scsiseq);
7660                         scsiseq = ahc_inb(ahc, SCSISEQ);
7661                         scsiseq &= ~ENSELI;
7662                         ahc_outb(ahc, SCSISEQ, scsiseq);
7663
7664                         if ((ahc->features & AHC_MULTIROLE) == 0) {
7665                                 printf("Configuring Initiator Mode\n");
7666                                 ahc->flags &= ~AHC_TARGETROLE;
7667                                 ahc->flags |= AHC_INITIATORROLE;
7668                                 /*
7669                                  * Returning to a configuration that
7670                                  * fit previously will always succeed.
7671                                  */
7672                                 (void)ahc_loadseq(ahc);
7673                                 ahc_restart(ahc);
7674                                 /*
7675                                  * Unpaused.  The extra unpause
7676                                  * that follows is harmless.
7677                                  */
7678                         }
7679                 }
7680                 ahc_unpause(ahc);
7681         }
7682 }
7683
7684 static void
7685 ahc_update_scsiid(struct ahc_softc *ahc, u_int targid_mask)
7686 {
7687         u_int scsiid_mask;
7688         u_int scsiid;
7689
7690         if ((ahc->features & AHC_MULTI_TID) == 0)
7691                 panic("ahc_update_scsiid called on non-multitid unit\n");
7692
7693         /*
7694          * Since we will rely on the TARGID mask
7695          * for selection enables, ensure that OID
7696          * in SCSIID is not set to some other ID
7697          * that we don't want to allow selections on.
7698          */
7699         if ((ahc->features & AHC_ULTRA2) != 0)
7700                 scsiid = ahc_inb(ahc, SCSIID_ULTRA2);
7701         else
7702                 scsiid = ahc_inb(ahc, SCSIID);
7703         scsiid_mask = 0x1 << (scsiid & OID);
7704         if ((targid_mask & scsiid_mask) == 0) {
7705                 u_int our_id;
7706
7707                 /* ffs counts from 1 */
7708                 our_id = ffs(targid_mask);
7709                 if (our_id == 0)
7710                         our_id = ahc->our_id;
7711                 else
7712                         our_id--;
7713                 scsiid &= TID;
7714                 scsiid |= our_id;
7715         }
7716         if ((ahc->features & AHC_ULTRA2) != 0)
7717                 ahc_outb(ahc, SCSIID_ULTRA2, scsiid);
7718         else
7719                 ahc_outb(ahc, SCSIID, scsiid);
7720 }
7721
7722 void
7723 ahc_run_tqinfifo(struct ahc_softc *ahc, int paused)
7724 {
7725         struct target_cmd *cmd;
7726
7727         /*
7728          * If the card supports auto-access pause,
7729          * we can access the card directly regardless
7730          * of whether it is paused or not.
7731          */
7732         if ((ahc->features & AHC_AUTOPAUSE) != 0)
7733                 paused = TRUE;
7734
7735         ahc_sync_tqinfifo(ahc, BUS_DMASYNC_POSTREAD);
7736         while ((cmd = &ahc->targetcmds[ahc->tqinfifonext])->cmd_valid != 0) {
7737
7738                 /*
7739                  * Only advance through the queue if we
7740                  * have the resources to process the command.
7741                  */
7742                 if (ahc_handle_target_cmd(ahc, cmd) != 0)
7743                         break;
7744
7745                 cmd->cmd_valid = 0;
7746                 aic_dmamap_sync(ahc, ahc->shared_data_dmat,
7747                                 ahc->shared_data_dmamap,
7748                                 ahc_targetcmd_offset(ahc, ahc->tqinfifonext),
7749                                 sizeof(struct target_cmd),
7750                                 BUS_DMASYNC_PREREAD);
7751                 ahc->tqinfifonext++;
7752
7753                 /*
7754                  * Lazily update our position in the target mode incoming
7755                  * command queue as seen by the sequencer.
7756                  */
7757                 if ((ahc->tqinfifonext & (HOST_TQINPOS - 1)) == 1) {
7758                         if ((ahc->features & AHC_HS_MAILBOX) != 0) {
7759                                 u_int hs_mailbox;
7760
7761                                 hs_mailbox = ahc_inb(ahc, HS_MAILBOX);
7762                                 hs_mailbox &= ~HOST_TQINPOS;
7763                                 hs_mailbox |= ahc->tqinfifonext & HOST_TQINPOS;
7764                                 ahc_outb(ahc, HS_MAILBOX, hs_mailbox);
7765                         } else {
7766                                 if (!paused)
7767                                         ahc_pause(ahc);
7768                                 ahc_outb(ahc, KERNEL_TQINPOS,
7769                                          ahc->tqinfifonext & HOST_TQINPOS);
7770                                 if (!paused)
7771                                         ahc_unpause(ahc);
7772                         }
7773                 }
7774         }
7775 }
7776
7777 static int
7778 ahc_handle_target_cmd(struct ahc_softc *ahc, struct target_cmd *cmd)
7779 {
7780         struct    ahc_tmode_tstate *tstate;
7781         struct    ahc_tmode_lstate *lstate;
7782         struct    ccb_accept_tio *atio;
7783         uint8_t *byte;
7784         int       initiator;
7785         int       target;
7786         int       lun;
7787
7788         initiator = SCSIID_TARGET(ahc, cmd->scsiid);
7789         target = SCSIID_OUR_ID(cmd->scsiid);
7790         lun    = (cmd->identify & MSG_IDENTIFY_LUNMASK);
7791
7792         byte = cmd->bytes;
7793         tstate = ahc->enabled_targets[target];
7794         lstate = NULL;
7795         if (tstate != NULL)
7796                 lstate = tstate->enabled_luns[lun];
7797
7798         /*
7799          * Commands for disabled luns go to the black hole driver.
7800          */
7801         if (lstate == NULL)
7802                 lstate = ahc->black_hole;
7803
7804         atio = (struct ccb_accept_tio*)SLIST_FIRST(&lstate->accept_tios);
7805         if (atio == NULL) {
7806                 ahc->flags |= AHC_TQINFIFO_BLOCKED;
7807                 /*
7808                  * Wait for more ATIOs from the peripheral driver for this lun.
7809                  */
7810                 if (bootverbose)
7811                         printf("%s: ATIOs exhausted\n", ahc_name(ahc));
7812                 return (1);
7813         } else
7814                 ahc->flags &= ~AHC_TQINFIFO_BLOCKED;
7815 #ifdef AHC_DEBUG
7816         if (ahc_debug & AHC_SHOW_TQIN) {
7817                 printf("Incoming command from %d for %d:%d%s\n",
7818                        initiator, target, lun,
7819                        lstate == ahc->black_hole ? "(Black Holed)" : "");
7820         }
7821 #endif
7822         SLIST_REMOVE_HEAD(&lstate->accept_tios, sim_links.sle);
7823
7824         if (lstate == ahc->black_hole) {
7825                 /* Fill in the wildcards */
7826                 atio->ccb_h.target_id = target;
7827                 atio->ccb_h.target_lun = lun;
7828         }
7829
7830         /*
7831          * Package it up and send it off to
7832          * whomever has this lun enabled.
7833          */
7834         atio->sense_len = 0;
7835         atio->init_id = initiator;
7836         if (byte[0] != 0xFF) {
7837                 /* Tag was included */
7838                 atio->tag_action = *byte++;
7839                 atio->tag_id = *byte++;
7840                 atio->ccb_h.flags |= CAM_TAG_ACTION_VALID;
7841         } else {
7842                 atio->ccb_h.flags &= ~CAM_TAG_ACTION_VALID;
7843         }
7844         byte++;
7845
7846         /* Okay.  Now determine the cdb size based on the command code */
7847         switch (*byte >> CMD_GROUP_CODE_SHIFT) {
7848         case 0:
7849                 atio->cdb_len = 6;
7850                 break;
7851         case 1:
7852         case 2:
7853                 atio->cdb_len = 10;
7854                 break;
7855         case 4:
7856                 atio->cdb_len = 16;
7857                 break;
7858         case 5:
7859                 atio->cdb_len = 12;
7860                 break;
7861         case 3:
7862         default:
7863                 /* Only copy the opcode. */
7864                 atio->cdb_len = 1;
7865                 printf("Reserved or VU command code type encountered\n");
7866                 break;
7867         }
7868
7869         memcpy(atio->cdb_io.cdb_bytes, byte, atio->cdb_len);
7870
7871         atio->ccb_h.status |= CAM_CDB_RECVD;
7872
7873         if ((cmd->identify & MSG_IDENTIFY_DISCFLAG) == 0) {
7874                 /*
7875                  * We weren't allowed to disconnect.
7876                  * We're hanging on the bus until a
7877                  * continue target I/O comes in response
7878                  * to this accept tio.
7879                  */
7880 #ifdef AHC_DEBUG
7881                 if (ahc_debug & AHC_SHOW_TQIN) {
7882                         printf("Received Immediate Command %d:%d:%d - %p\n",
7883                                initiator, target, lun, ahc->pending_device);
7884                 }
7885 #endif
7886                 ahc->pending_device = lstate;
7887                 aic_freeze_ccb((union ccb *)atio);
7888                 atio->ccb_h.flags |= CAM_DIS_DISCONNECT;
7889         }
7890         xpt_done((union ccb*)atio);
7891         return (0);
7892 }
7893
7894 #endif