sys/isa/pnp.c

   1 /*
   2  * SPDX-License-Identifier: BSD-2-Clause
   3  *
   4  * Copyright (c) 1996, Sujal M. Patel
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  *      from: pnp.c,v 1.11 1999/05/06 22:11:19 peter Exp
  29  */
  30
  31 #include <sys/param.h>
  32 #include <sys/systm.h>
  33 #include <sys/kernel.h>
  34 #include <sys/module.h>
  35 #include <sys/bus.h>
  36 #include <sys/endian.h>
  37 #include <sys/malloc.h>
  38 #include <isa/isavar.h>
  39 #include <isa/pnpreg.h>
  40 #include <isa/pnpvar.h>
  41 #include <machine/bus.h>
  42
  43 typedef struct _pnp_id {
  44         uint32_t vendor_id;
  45         uint32_t serial;
  46         u_char checksum;
  47 } pnp_id;
  48
  49 struct pnp_set_config_arg {
  50         int     csn;            /* Card number to configure */
  51         int     ldn;            /* Logical device on card */
  52 };
  53
  54 struct pnp_quirk {
  55         uint32_t vendor_id;     /* Vendor of the card */
  56         uint32_t logical_id;    /* ID of the device with quirk */
  57         int     type;
  58 #define PNP_QUIRK_WRITE_REG     1 /* Need to write a pnp register  */
  59 #define PNP_QUIRK_EXTRA_IO      2 /* Has extra io ports  */
  60         int     arg1;
  61         int     arg2;
  62 };
  63
  64 struct pnp_quirk pnp_quirks[] = {
  65         /*
  66          * The Gravis UltraSound needs register 0xf2 to be set to 0xff
  67          * to enable power.
  68          * XXX need to know the logical device id.
  69          */
  70         { 0x0100561e /* GRV0001 */,     0,
  71           PNP_QUIRK_WRITE_REG,  0xf2,    0xff },
  72         /*
  73          * An emu8000 does not give us other than the first
  74          * port.
  75          */
  76         { 0x26008c0e /* SB16 */,        0x21008c0e,
  77           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
  78         { 0x42008c0e /* SB32(CTL0042) */,       0x21008c0e,
  79           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
  80         { 0x44008c0e /* SB32(CTL0044) */,       0x21008c0e,
  81           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
  82         { 0x49008c0e /* SB32(CTL0049) */,       0x21008c0e,
  83           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
  84         { 0xf1008c0e /* SB32(CTL00f1) */,       0x21008c0e,
  85           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
  86         { 0xc1008c0e /* SB64(CTL00c1) */,       0x22008c0e,
  87           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
  88         { 0xc5008c0e /* SB64(CTL00c5) */,       0x22008c0e,
  89           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
  90         { 0xe4008c0e /* SB64(CTL00e4) */,       0x22008c0e,
  91           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
  92
  93         { 0 }
  94 };
  95
  96 /* The READ_DATA port that we are using currently */
  97 static int pnp_rd_port;
  98
  99 static void   pnp_send_initiation_key(void);
 100 static int    pnp_get_serial(pnp_id *p);
 101 static int    pnp_isolation_protocol(device_t parent);
 102
 103 static void
 104 pnp_write(int d, u_char r)
 105 {
 106         outb (_PNP_ADDRESS, d);
 107         outb (_PNP_WRITE_DATA, r);
 108 }
 109
 110 /*
 111  * Send Initiation LFSR as described in "Plug and Play ISA Specification",
 112  * Intel May 94.
 113  */
 114 static void
 115 pnp_send_initiation_key(void)
 116 {
 117         int cur, i;
 118
 119         /* Reset the LSFR */
 120         outb(_PNP_ADDRESS, 0);
 121         outb(_PNP_ADDRESS, 0); /* yes, we do need it twice! */
 122
 123         cur = 0x6a;
 124         outb(_PNP_ADDRESS, cur);
 125
 126         for (i = 1; i < 32; i++) {
 127                 cur = (cur >> 1) | (((cur ^ (cur >> 1)) << 7) & 0xff);
 128                 outb(_PNP_ADDRESS, cur);
 129         }
 130 }
 131
 132
 133 /*
 134  * Get the device's serial number.  Returns 1 if the serial is valid.
 135  */
 136 static int
 137 pnp_get_serial(pnp_id *p)
 138 {
 139         int i, bit, valid = 0, sum = 0x6a;
 140         u_char *data = (u_char *)p;
 141
 142         bzero(data, sizeof(char) * 9);
 143         outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION);
 144         for (i = 0; i < 72; i++) {
 145                 bit = inb((pnp_rd_port << 2) | 0x3) == 0x55;
 146                 DELAY(250);     /* Delay 250 usec */
 147
 148                 /* Can't Short Circuit the next evaluation, so 'and' is last */
 149                 bit = (inb((pnp_rd_port << 2) | 0x3) == 0xaa) && bit;
 150                 DELAY(250);     /* Delay 250 usec */
 151
 152                 valid = valid || bit;
 153                 if (i < 64)
 154                         sum = (sum >> 1) |
 155                           (((sum ^ (sum >> 1) ^ bit) << 7) & 0xff);
 156                 data[i / 8] = (data[i / 8] >> 1) | (bit ? 0x80 : 0);
 157         }
 158
 159         valid = valid && (data[8] == sum);
 160
 161         return (valid);
 162 }
 163
 164 /*
 165  * Fill's the buffer with resource info from the device.
 166  * Returns the number of characters read.
 167  */
 168 static int
 169 pnp_get_resource_info(u_char *buffer, int len)
 170 {
 171         int i, j, count;
 172         u_char temp;
 173
 174         count = 0;
 175         for (i = 0; i < len; i++) {
 176                 outb(_PNP_ADDRESS, PNP_STATUS);
 177                 for (j = 0; j < 100; j++) {
 178                         if ((inb((pnp_rd_port << 2) | 0x3)) & 0x1)
 179                                 break;
 180                         DELAY(10);
 181                 }
 182                 if (j == 100) {
 183                         printf("PnP device failed to report resource data\n");
 184                         return (count);
 185                 }
 186                 outb(_PNP_ADDRESS, PNP_RESOURCE_DATA);
 187                 temp = inb((pnp_rd_port << 2) | 0x3);
 188                 if (buffer != NULL)
 189                         buffer[i] = temp;
 190                 count++;
 191         }
 192         return (count);
 193 }
 194
 195 /*
 196  * This function is called after the bus has assigned resource
 197  * locations for a logical device.
 198  */
 199 static void
 200 pnp_set_config(void *arg, struct isa_config *config, int enable)
 201 {
 202         int csn = ((struct pnp_set_config_arg *) arg)->csn;
 203         int ldn = ((struct pnp_set_config_arg *) arg)->ldn;
 204         int i;
 205
 206         /*
 207          * First put all cards into Sleep state with the initiation
 208          * key, then put our card into Config state.
 209          */
 210         pnp_send_initiation_key();
 211         pnp_write(PNP_WAKE, csn);
 212
 213         /*
 214          * Select our logical device so that we can program it.
 215          */
 216         pnp_write(PNP_SET_LDN, ldn);
 217
 218         /*
 219          * Constrain the number of resources we will try to program
 220          */
 221         if (config->ic_nmem > ISA_PNP_NMEM) {
 222                 printf("too many ISA memory ranges (%d > %d)\n",
 223                     config->ic_nmem, ISA_PNP_NMEM);
 224                 config->ic_nmem = ISA_PNP_NMEM;
 225         }
 226         if (config->ic_nport > ISA_PNP_NPORT) {
 227                 printf("too many ISA I/O ranges (%d > %d)\n", config->ic_nport,
 228                     ISA_PNP_NPORT);
 229                 config->ic_nport = ISA_PNP_NPORT;
 230         }
 231         if (config->ic_nirq > ISA_PNP_NIRQ) {
 232                 printf("too many ISA IRQs (%d > %d)\n", config->ic_nirq,
 233                     ISA_PNP_NIRQ);
 234                 config->ic_nirq = ISA_PNP_NIRQ;
 235         }
 236         if (config->ic_ndrq > ISA_PNP_NDRQ) {
 237                 printf("too many ISA DRQs (%d > %d)\n", config->ic_ndrq,
 238                     ISA_PNP_NDRQ);
 239                 config->ic_ndrq = ISA_PNP_NDRQ;
 240         }
 241
 242         /*
 243          * Now program the resources.
 244          */
 245         for (i = 0; i < config->ic_nmem; i++) {
 246                 uint32_t start;
 247                 uint32_t size;
 248
 249                 /* XXX: should handle memory control register, 32 bit memory */
 250                 if (config->ic_mem[i].ir_size == 0) {
 251                         pnp_write(PNP_MEM_BASE_HIGH(i), 0);
 252                         pnp_write(PNP_MEM_BASE_LOW(i), 0);
 253                         pnp_write(PNP_MEM_RANGE_HIGH(i), 0);
 254                         pnp_write(PNP_MEM_RANGE_LOW(i), 0);
 255                 } else {
 256                         start = config->ic_mem[i].ir_start;
 257                         size =  config->ic_mem[i].ir_size;
 258                         if (start & 0xff)
 259                                 panic("pnp_set_config: bogus memory assignment");
 260                         pnp_write(PNP_MEM_BASE_HIGH(i), (start >> 16) & 0xff);
 261                         pnp_write(PNP_MEM_BASE_LOW(i), (start >> 8) & 0xff);
 262                         pnp_write(PNP_MEM_RANGE_HIGH(i), (size >> 16) & 0xff);
 263                         pnp_write(PNP_MEM_RANGE_LOW(i), (size >> 8) & 0xff);
 264                 }
 265         }
 266         for (; i < ISA_PNP_NMEM; i++) {
 267                 pnp_write(PNP_MEM_BASE_HIGH(i), 0);
 268                 pnp_write(PNP_MEM_BASE_LOW(i), 0);
 269                 pnp_write(PNP_MEM_RANGE_HIGH(i), 0);
 270                 pnp_write(PNP_MEM_RANGE_LOW(i), 0);
 271         }
 272
 273         for (i = 0; i < config->ic_nport; i++) {
 274                 uint32_t start;
 275
 276                 if (config->ic_port[i].ir_size == 0) {
 277                         pnp_write(PNP_IO_BASE_HIGH(i), 0);
 278                         pnp_write(PNP_IO_BASE_LOW(i), 0);
 279                 } else {
 280                         start = config->ic_port[i].ir_start;
 281                         pnp_write(PNP_IO_BASE_HIGH(i), (start >> 8) & 0xff);
 282                         pnp_write(PNP_IO_BASE_LOW(i), (start >> 0) & 0xff);
 283                 }
 284         }
 285         for (; i < ISA_PNP_NPORT; i++) {
 286                 pnp_write(PNP_IO_BASE_HIGH(i), 0);
 287                 pnp_write(PNP_IO_BASE_LOW(i), 0);
 288         }
 289
 290         for (i = 0; i < config->ic_nirq; i++) {
 291                 int irq;
 292
 293                 /* XXX: interrupt type */
 294                 if (config->ic_irqmask[i] == 0) {
 295                         pnp_write(PNP_IRQ_LEVEL(i), 0);
 296                         pnp_write(PNP_IRQ_TYPE(i), 2);
 297                 } else {
 298                         irq = ffs(config->ic_irqmask[i]) - 1;
 299                         pnp_write(PNP_IRQ_LEVEL(i), irq);
 300                         pnp_write(PNP_IRQ_TYPE(i), 2); /* XXX */
 301                 }
 302         }
 303         for (; i < ISA_PNP_NIRQ; i++) {
 304                 /*
 305                  * IRQ 0 is not a valid interrupt selection and
 306                  * represents no interrupt selection.
 307                  */
 308                 pnp_write(PNP_IRQ_LEVEL(i), 0);
 309                 pnp_write(PNP_IRQ_TYPE(i), 2);
 310         }
 311
 312         for (i = 0; i < config->ic_ndrq; i++) {
 313                 int drq;
 314
 315                 if (config->ic_drqmask[i] == 0) {
 316                         pnp_write(PNP_DMA_CHANNEL(i), 4);
 317                 } else {
 318                         drq = ffs(config->ic_drqmask[i]) - 1;
 319                         pnp_write(PNP_DMA_CHANNEL(i), drq);
 320                 }
 321         }
 322         for (; i < ISA_PNP_NDRQ; i++) {
 323                 /*
 324                  * DMA channel 4, the cascade channel is used to
 325                  * indicate no DMA channel is active.
 326                  */
 327                 pnp_write(PNP_DMA_CHANNEL(i), 4);
 328         }
 329
 330         pnp_write(PNP_ACTIVATE, enable ? 1 : 0);
 331
 332         /*
 333          * Wake everyone up again, we are finished.
 334          */
 335         pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY);
 336 }
 337
 338 /*
 339  * Process quirks for a logical device.. The card must be in Config state.
 340  */
 341 void
 342 pnp_check_quirks(uint32_t vendor_id, uint32_t logical_id, int ldn,
 343     struct isa_config *config)
 344 {
 345         struct pnp_quirk *qp;
 346
 347         for (qp = &pnp_quirks[0]; qp->vendor_id; qp++) {
 348                 if (qp->vendor_id == vendor_id
 349                     && (qp->logical_id == 0 || qp->logical_id == logical_id)) {
 350                         switch (qp->type) {
 351                         case PNP_QUIRK_WRITE_REG:
 352                                 pnp_write(PNP_SET_LDN, ldn);
 353                                 pnp_write(qp->arg1, qp->arg2);
 354                                 break;
 355                         case PNP_QUIRK_EXTRA_IO:
 356                                 if (config == NULL)
 357                                         break;
 358                                 if (qp->arg1 != 0) {
 359                                         config->ic_nport++;
 360                                         config->ic_port[config->ic_nport - 1] = config->ic_port[0];
 361                                         config->ic_port[config->ic_nport - 1].ir_start += qp->arg1;
 362                                         config->ic_port[config->ic_nport - 1].ir_end += qp->arg1;
 363                                 }
 364                                 if (qp->arg2 != 0) {
 365                                         config->ic_nport++;
 366                                         config->ic_port[config->ic_nport - 1] = config->ic_port[0];
 367                                         config->ic_port[config->ic_nport - 1].ir_start += qp->arg2;
 368                                         config->ic_port[config->ic_nport - 1].ir_end += qp->arg2;
 369                                 }
 370                                 break;
 371                         }
 372                 }
 373         }
 374 }
 375
 376 /*
 377  * Scan Resource Data for Logical Devices.
 378  *
 379  * This function exits as soon as it gets an error reading *ANY*
 380  * Resource Data or it reaches the end of Resource Data.  In the first
 381  * case the return value will be TRUE, FALSE otherwise.
 382  */
 383 static int
 384 pnp_create_devices(device_t parent, pnp_id *p, int csn,
 385     u_char *resources, int len)
 386 {
 387         u_char tag, *resp, *resinfo, *startres = NULL;
 388         int large_len, scanning = len, retval = FALSE;
 389         uint32_t logical_id;
 390         device_t dev = 0;
 391         int ldn = 0;
 392         struct pnp_set_config_arg *csnldn;
 393         char buf[100];
 394         char *desc = NULL;
 395
 396         resp = resources;
 397         while (scanning > 0) {
 398                 tag = *resp++;
 399                 scanning--;
 400                 if (PNP_RES_TYPE(tag) != 0) {
 401                         /* Large resource */
 402                         if (scanning < 2) {
 403                                 scanning = 0;
 404                                 continue;
 405                         }
 406                         large_len = resp[0] + (resp[1] << 8);
 407                         resp += 2;
 408
 409                         if (scanning < large_len) {
 410                                 scanning = 0;
 411                                 continue;
 412                         }
 413                         resinfo = resp;
 414                         resp += large_len;
 415                         scanning -= large_len;
 416
 417                         if (PNP_LRES_NUM(tag) == PNP_TAG_ID_ANSI) {
 418                                 if (dev) {
 419                                         /*
 420                                          * This is an optional device
 421                                          * identifier string. Skip it
 422                                          * for now.
 423                                          */
 424                                         continue;
 425                                 }
 426                                 /* else mandately card identifier string */
 427                                 if (large_len > sizeof(buf) - 1)
 428                                         large_len = sizeof(buf) - 1;
 429                                 bcopy(resinfo, buf, large_len);
 430
 431                                 /*
 432                                  * Trim trailing spaces.
 433                                  */
 434                                 while (buf[large_len-1] == ' ')
 435                                         large_len--;
 436                                 buf[large_len] = '\0';
 437                                 desc = buf;
 438                                 continue;
 439                         }
 440
 441                         continue;
 442                 }
 443
 444                 /* Small resource */
 445                 if (scanning < PNP_SRES_LEN(tag)) {
 446                         scanning = 0;
 447                         continue;
 448                 }
 449                 resinfo = resp;
 450                 resp += PNP_SRES_LEN(tag);
 451                 scanning -= PNP_SRES_LEN(tag);
 452
 453                 switch (PNP_SRES_NUM(tag)) {
 454                 case PNP_TAG_LOGICAL_DEVICE:
 455                         /*
 456                          * Parse the resources for the previous
 457                          * logical device (if any).
 458                          */
 459                         if (startres) {
 460                                 pnp_parse_resources(dev, startres,
 461                                     resinfo - startres - 1, ldn);
 462                                 dev = 0;
 463                                 startres = NULL;
 464                         }
 465
 466                         /*
 467                          * A new logical device. Scan for end of
 468                          * resources.
 469                          */
 470                         bcopy(resinfo, &logical_id, 4);
 471                         pnp_check_quirks(p->vendor_id, logical_id, ldn, NULL);
 472                         dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNP, NULL, -1);
 473                         if (desc)
 474                                 device_set_desc_copy(dev, desc);
 475                         else
 476                                 device_set_desc_copy(dev,
 477                                     pnp_eisaformat(logical_id));
 478                         isa_set_vendorid(dev, p->vendor_id);
 479                         isa_set_serial(dev, p->serial);
 480                         isa_set_logicalid(dev, logical_id);
 481                         isa_set_configattr(dev,
 482                             ISACFGATTR_CANDISABLE | ISACFGATTR_DYNAMIC);
 483                         csnldn = malloc(sizeof *csnldn, M_DEVBUF, M_NOWAIT);
 484                         if (!csnldn) {
 485                                 device_printf(parent, "out of memory\n");
 486                                 scanning = 0;
 487                                 break;
 488                         }
 489                         csnldn->csn = csn;
 490                         csnldn->ldn = ldn;
 491                         ISA_SET_CONFIG_CALLBACK(parent, dev, pnp_set_config,
 492                             csnldn);
 493                         isa_set_pnp_csn(dev, csn);
 494                         isa_set_pnp_ldn(dev, ldn);
 495                         ldn++;
 496                         startres = resp;
 497                         break;
 498
 499                 case PNP_TAG_END:
 500                         if (!startres) {
 501                                 device_printf(parent, "malformed resources\n");
 502                                 scanning = 0;
 503                                 break;
 504                         }
 505                         pnp_parse_resources(dev, startres,
 506                             resinfo - startres - 1, ldn);
 507                         dev = 0;
 508                         startres = NULL;
 509                         scanning = 0;
 510                         break;
 511
 512                 default:
 513                         /* Skip this resource */
 514                         break;
 515                 }
 516         }
 517
 518         return (retval);
 519 }
 520
 521 /*
 522  * Read 'amount' bytes of resources from the card, allocating memory
 523  * as needed. If a buffer is already available, it should be passed in
 524  * '*resourcesp' and its length in '*spacep'. The number of resource
 525  * bytes already in the buffer should be passed in '*lenp'. The memory
 526  * allocated will be returned in '*resourcesp' with its size and the
 527  * number of bytes of resources in '*spacep' and '*lenp' respectively.
 528  *
 529  * XXX: Multiple problems here, we forget to free() stuff in one
 530  * XXX: error return, and in another case we free (*resourcesp) but
 531  * XXX: don't tell the caller.
 532  */
 533 static int
 534 pnp_read_bytes(int amount, u_char **resourcesp, int *spacep, int *lenp)
 535 {
 536         u_char *resources = *resourcesp;
 537         u_char *newres;
 538         int space = *spacep;
 539         int len = *lenp;
 540
 541         if (space == 0) {
 542                 space = 1024;
 543                 resources = malloc(space, M_TEMP, M_NOWAIT);
 544                 if (!resources)
 545                         return (ENOMEM);
 546         }
 547
 548         if (len + amount > space) {
 549                 int extra = 1024;
 550                 while (len + amount > space + extra)
 551                         extra += 1024;
 552                 newres = malloc(space + extra, M_TEMP, M_NOWAIT);
 553                 if (!newres) {
 554                         /* XXX: free resources */
 555                         return (ENOMEM);
 556                 }
 557                 bcopy(resources, newres, len);
 558                 free(resources, M_TEMP);
 559                 resources = newres;
 560                 space += extra;
 561         }
 562
 563         if (pnp_get_resource_info(resources + len, amount) != amount)
 564                 return (EINVAL);
 565         len += amount;
 566
 567         *resourcesp = resources;
 568         *spacep = space;
 569         *lenp = len;
 570
 571         return (0);
 572 }
 573
 574 /*
 575  * Read all resources from the card, allocating memory as needed. If a
 576  * buffer is already available, it should be passed in '*resourcesp'
 577  * and its length in '*spacep'. The memory allocated will be returned
 578  * in '*resourcesp' with its size and the number of bytes of resources
 579  * in '*spacep' and '*lenp' respectively.
 580  */
 581 static int
 582 pnp_read_resources(u_char **resourcesp, int *spacep, int *lenp)
 583 {
 584         u_char *resources = *resourcesp;
 585         int space = *spacep;
 586         int len = 0;
 587         int error, done;
 588         u_char tag;
 589
 590         error = 0;
 591         done = 0;
 592         while (!done) {
 593                 error = pnp_read_bytes(1, &resources, &space, &len);
 594                 if (error)
 595                         goto out;
 596                 tag = resources[len-1];
 597                 if (PNP_RES_TYPE(tag) == 0) {
 598                         /*
 599                          * Small resource, read contents.
 600                          */
 601                         error = pnp_read_bytes(PNP_SRES_LEN(tag),
 602                             &resources, &space, &len);
 603                         if (error)
 604                                 goto out;
 605                         if (PNP_SRES_NUM(tag) == PNP_TAG_END)
 606                                 done = 1;
 607                 } else {
 608                         /*
 609                          * Large resource, read length and contents.
 610                          */
 611                         error = pnp_read_bytes(2, &resources, &space, &len);
 612                         if (error)
 613                                 goto out;
 614                         error = pnp_read_bytes(resources[len-2]
 615                             + (resources[len-1] << 8), &resources, &space,
 616                             &len);
 617                         if (error)
 618                                 goto out;
 619                 }
 620         }
 621
 622  out:
 623         *resourcesp = resources;
 624         *spacep = space;
 625         *lenp = len;
 626         return (error);
 627 }
 628
 629 /*
 630  * Run the isolation protocol. Use pnp_rd_port as the READ_DATA port
 631  * value (caller should try multiple READ_DATA locations before giving
 632  * up). Upon exiting, all cards are aware that they should use
 633  * pnp_rd_port as the READ_DATA port.
 634  *
 635  * In the first pass, a csn is assigned to each board and pnp_id's
 636  * are saved to an array, pnp_devices. In the second pass, each
 637  * card is woken up and the device configuration is called.
 638  */
 639 static int
 640 pnp_isolation_protocol(device_t parent)
 641 {
 642         int csn;
 643         pnp_id id;
 644         int found = 0, len;
 645         u_char *resources = NULL;
 646         int space = 0;
 647         int error;
 648
 649         /*
 650          * Put all cards into the Sleep state so that we can clear
 651          * their CSNs.
 652          */
 653         pnp_send_initiation_key();
 654
 655         /*
 656          * Clear the CSN for all cards.
 657          */
 658         pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_RESET_CSN);
 659
 660         /*
 661          * Move all cards to the Isolation state.
 662          */
 663         pnp_write(PNP_WAKE, 0);
 664
 665         /*
 666          * Tell them where the read point is going to be this time.
 667          */
 668         pnp_write(PNP_SET_RD_DATA, pnp_rd_port);
 669
 670         for (csn = 1; csn < PNP_MAX_CARDS; csn++) {
 671                 /*
 672                  * Start the serial isolation protocol.
 673                  */
 674                 outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION);
 675                 DELAY(1000);    /* Delay 1 msec */
 676
 677                 if (pnp_get_serial(&id)) {
 678                         /*
 679                          * We have read the id from a card
 680                          * successfully. The card which won the
 681                          * isolation protocol will be in Isolation
 682                          * mode and all others will be in Sleep.
 683                          * Program the CSN of the isolated card
 684                          * (taking it to Config state) and read its
 685                          * resources, creating devices as we find
 686                          * logical devices on the card.
 687                          */
 688                         pnp_write(PNP_SET_CSN, csn);
 689                         if (bootverbose)
 690                                 printf("Reading PnP configuration for %s.\n",
 691                                     pnp_eisaformat(id.vendor_id));
 692                         error = pnp_read_resources(&resources, &space, &len);
 693                         if (error)
 694                                 break;
 695                         pnp_create_devices(parent, &id, csn, resources, len);
 696                         found++;
 697                 } else
 698                         break;
 699
 700                 /*
 701                  * Put this card back to the Sleep state and
 702                  * simultaneously move all cards which don't have a
 703                  * CSN yet to Isolation state.
 704                  */
 705                 pnp_write(PNP_WAKE, 0);
 706         }
 707
 708         /*
 709          * Unless we have chosen the wrong read port, all cards will
 710          * be in Sleep state. Put them back into WaitForKey for
 711          * now. Their resources will be programmed later.
 712          */
 713         pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY);
 714
 715         /*
 716          * Cleanup.
 717          */
 718         if (resources)
 719                 free(resources, M_TEMP);
 720
 721         return (found);
 722 }
 723
 724
 725 /*
 726  * pnp_identify()
 727  *
 728  * autoconfiguration of pnp devices. This routine just runs the
 729  * isolation protocol over several ports, until one is successful.
 730  *
 731  * may be called more than once ?
 732  *
 733  */
 734
 735 static void
 736 pnp_identify(driver_t *driver, device_t parent)
 737 {
 738         int num_pnp_devs;
 739
 740         /* Try various READ_DATA ports from 0x203-0x3ff */
 741         for (pnp_rd_port = 0x80; (pnp_rd_port < 0xff); pnp_rd_port += 0x10) {
 742                 if (bootverbose)
 743                         printf("pnp_identify: Trying Read_Port at %x\n",
 744                             (pnp_rd_port << 2) | 0x3);
 745
 746                 num_pnp_devs = pnp_isolation_protocol(parent);
 747                 if (num_pnp_devs)
 748                         break;
 749         }
 750         if (bootverbose)
 751                 printf("PNP Identify complete\n");
 752 }
 753
 754 static device_method_t pnp_methods[] = {
 755         /* Device interface */
 756         DEVMETHOD(device_identify,      pnp_identify),
 757
 758         { 0, 0 }
 759 };
 760
 761 static driver_t pnp_driver = {
 762         "pnp",
 763         pnp_methods,
 764         1,                      /* no softc */
 765 };
 766
 767 DRIVER_MODULE(pnp, isa, pnp_driver, 0, 0);