sys/isa/pnp.c

   1 /*
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   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/cdefs.h>
  32 __FBSDID("$FreeBSD$");
  33
  34 #include <sys/param.h>
  35 #include <sys/systm.h>
  36 #include <sys/kernel.h>
  37 #include <sys/module.h>
  38 #include <sys/bus.h>
  39 #include <sys/endian.h>
  40 #include <sys/malloc.h>
  41 #include <isa/isavar.h>
  42 #include <isa/pnpreg.h>
  43 #include <isa/pnpvar.h>
  44 #include <machine/bus.h>
  45
  46 typedef struct _pnp_id {
  47         uint32_t vendor_id;
  48         uint32_t serial;
  49         u_char checksum;
  50 } pnp_id;
  51
  52 struct pnp_set_config_arg {
  53         int     csn;            /* Card number to configure */
  54         int     ldn;            /* Logical device on card */
  55 };
  56
  57 struct pnp_quirk {
  58         uint32_t vendor_id;     /* Vendor of the card */
  59         uint32_t logical_id;    /* ID of the device with quirk */
  60         int     type;
  61 #define PNP_QUIRK_WRITE_REG     1 /* Need to write a pnp register  */
  62 #define PNP_QUIRK_EXTRA_IO      2 /* Has extra io ports  */
  63         int     arg1;
  64         int     arg2;
  65 };
  66
  67 struct pnp_quirk pnp_quirks[] = {
  68         /*
  69          * The Gravis UltraSound needs register 0xf2 to be set to 0xff
  70          * to enable power.
  71          * XXX need to know the logical device id.
  72          */
  73         { 0x0100561e /* GRV0001 */,     0,
  74           PNP_QUIRK_WRITE_REG,  0xf2,    0xff },
  75         /*
  76          * An emu8000 does not give us other than the first
  77          * port.
  78          */
  79         { 0x26008c0e /* SB16 */,        0x21008c0e,
  80           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
  81         { 0x42008c0e /* SB32(CTL0042) */,       0x21008c0e,
  82           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
  83         { 0x44008c0e /* SB32(CTL0044) */,       0x21008c0e,
  84           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
  85         { 0x49008c0e /* SB32(CTL0049) */,       0x21008c0e,
  86           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
  87         { 0xf1008c0e /* SB32(CTL00f1) */,       0x21008c0e,
  88           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
  89         { 0xc1008c0e /* SB64(CTL00c1) */,       0x22008c0e,
  90           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
  91         { 0xc5008c0e /* SB64(CTL00c5) */,       0x22008c0e,
  92           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
  93         { 0xe4008c0e /* SB64(CTL00e4) */,       0x22008c0e,
  94           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
  95
  96         { 0 }
  97 };
  98
  99 /* The READ_DATA port that we are using currently */
 100 static int pnp_rd_port;
 101
 102 static void   pnp_send_initiation_key(void);
 103 static int    pnp_get_serial(pnp_id *p);
 104 static int    pnp_isolation_protocol(device_t parent);
 105
 106 static void
 107 pnp_write(int d, u_char r)
 108 {
 109         outb (_PNP_ADDRESS, d);
 110         outb (_PNP_WRITE_DATA, r);
 111 }
 112
 113 /*
 114  * Send Initiation LFSR as described in "Plug and Play ISA Specification",
 115  * Intel May 94.
 116  */
 117 static void
 118 pnp_send_initiation_key()
 119 {
 120         int cur, i;
 121
 122         /* Reset the LSFR */
 123         outb(_PNP_ADDRESS, 0);
 124         outb(_PNP_ADDRESS, 0); /* yes, we do need it twice! */
 125
 126         cur = 0x6a;
 127         outb(_PNP_ADDRESS, cur);
 128
 129         for (i = 1; i < 32; i++) {
 130                 cur = (cur >> 1) | (((cur ^ (cur >> 1)) << 7) & 0xff);
 131                 outb(_PNP_ADDRESS, cur);
 132         }
 133 }
 134
 135
 136 /*
 137  * Get the device's serial number.  Returns 1 if the serial is valid.
 138  */
 139 static int
 140 pnp_get_serial(pnp_id *p)
 141 {
 142         int i, bit, valid = 0, sum = 0x6a;
 143         u_char *data = (u_char *)p;
 144
 145         bzero(data, sizeof(char) * 9);
 146         outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION);
 147         for (i = 0; i < 72; i++) {
 148                 bit = inb((pnp_rd_port << 2) | 0x3) == 0x55;
 149                 DELAY(250);     /* Delay 250 usec */
 150
 151                 /* Can't Short Circuit the next evaluation, so 'and' is last */
 152                 bit = (inb((pnp_rd_port << 2) | 0x3) == 0xaa) && bit;
 153                 DELAY(250);     /* Delay 250 usec */
 154
 155                 valid = valid || bit;
 156                 if (i < 64)
 157                         sum = (sum >> 1) |
 158                           (((sum ^ (sum >> 1) ^ bit) << 7) & 0xff);
 159                 data[i / 8] = (data[i / 8] >> 1) | (bit ? 0x80 : 0);
 160         }
 161
 162         valid = valid && (data[8] == sum);
 163
 164         return (valid);
 165 }
 166
 167 /*
 168  * Fill's the buffer with resource info from the device.
 169  * Returns the number of characters read.
 170  */
 171 static int
 172 pnp_get_resource_info(u_char *buffer, int len)
 173 {
 174         int i, j, count;
 175         u_char temp;
 176
 177         count = 0;
 178         for (i = 0; i < len; i++) {
 179                 outb(_PNP_ADDRESS, PNP_STATUS);
 180                 for (j = 0; j < 100; j++) {
 181                         if ((inb((pnp_rd_port << 2) | 0x3)) & 0x1)
 182                                 break;
 183                         DELAY(10);
 184                 }
 185                 if (j == 100) {
 186                         printf("PnP device failed to report resource data\n");
 187                         return (count);
 188                 }
 189                 outb(_PNP_ADDRESS, PNP_RESOURCE_DATA);
 190                 temp = inb((pnp_rd_port << 2) | 0x3);
 191                 if (buffer != NULL)
 192                         buffer[i] = temp;
 193                 count++;
 194         }
 195         return (count);
 196 }
 197
 198 /*
 199  * This function is called after the bus has assigned resource
 200  * locations for a logical device.
 201  */
 202 static void
 203 pnp_set_config(void *arg, struct isa_config *config, int enable)
 204 {
 205         int csn = ((struct pnp_set_config_arg *) arg)->csn;
 206         int ldn = ((struct pnp_set_config_arg *) arg)->ldn;
 207         int i;
 208
 209         /*
 210          * First put all cards into Sleep state with the initiation
 211          * key, then put our card into Config state.
 212          */
 213         pnp_send_initiation_key();
 214         pnp_write(PNP_WAKE, csn);
 215
 216         /*
 217          * Select our logical device so that we can program it.
 218          */
 219         pnp_write(PNP_SET_LDN, ldn);
 220
 221         /*
 222          * Constrain the number of resources we will try to program
 223          */
 224         if (config->ic_nmem > ISA_PNP_NMEM) {
 225                 printf("too many ISA memory ranges (%d > %d)\n",
 226                     config->ic_nmem, ISA_PNP_NMEM);
 227                 config->ic_nmem = ISA_PNP_NMEM;
 228         }
 229         if (config->ic_nport > ISA_PNP_NPORT) {
 230                 printf("too many ISA I/O ranges (%d > %d)\n", config->ic_nport,
 231                     ISA_PNP_NPORT);
 232                 config->ic_nport = ISA_PNP_NPORT;
 233         }
 234         if (config->ic_nirq > ISA_PNP_NIRQ) {
 235                 printf("too many ISA IRQs (%d > %d)\n", config->ic_nirq,
 236                     ISA_PNP_NIRQ);
 237                 config->ic_nirq = ISA_PNP_NIRQ;
 238         }
 239         if (config->ic_ndrq > ISA_PNP_NDRQ) {
 240                 printf("too many ISA DRQs (%d > %d)\n", config->ic_ndrq,
 241                     ISA_PNP_NDRQ);
 242                 config->ic_ndrq = ISA_PNP_NDRQ;
 243         }
 244
 245         /*
 246          * Now program the resources.
 247          */
 248         for (i = 0; i < config->ic_nmem; i++) {
 249                 uint32_t start;
 250                 uint32_t size;
 251
 252                 /* XXX: should handle memory control register, 32 bit memory */
 253                 if (config->ic_mem[i].ir_size == 0) {
 254                         pnp_write(PNP_MEM_BASE_HIGH(i), 0);
 255                         pnp_write(PNP_MEM_BASE_LOW(i), 0);
 256                         pnp_write(PNP_MEM_RANGE_HIGH(i), 0);
 257                         pnp_write(PNP_MEM_RANGE_LOW(i), 0);
 258                 } else {
 259                         start = config->ic_mem[i].ir_start;
 260                         size =  config->ic_mem[i].ir_size;
 261                         if (start & 0xff)
 262                                 panic("pnp_set_config: bogus memory assignment");
 263                         pnp_write(PNP_MEM_BASE_HIGH(i), (start >> 16) & 0xff);
 264                         pnp_write(PNP_MEM_BASE_LOW(i), (start >> 8) & 0xff);
 265                         pnp_write(PNP_MEM_RANGE_HIGH(i), (size >> 16) & 0xff);
 266                         pnp_write(PNP_MEM_RANGE_LOW(i), (size >> 8) & 0xff);
 267                 }
 268         }
 269         for (; i < ISA_PNP_NMEM; i++) {
 270                 pnp_write(PNP_MEM_BASE_HIGH(i), 0);
 271                 pnp_write(PNP_MEM_BASE_LOW(i), 0);
 272                 pnp_write(PNP_MEM_RANGE_HIGH(i), 0);
 273                 pnp_write(PNP_MEM_RANGE_LOW(i), 0);
 274         }
 275
 276         for (i = 0; i < config->ic_nport; i++) {
 277                 uint32_t start;
 278
 279                 if (config->ic_port[i].ir_size == 0) {
 280                         pnp_write(PNP_IO_BASE_HIGH(i), 0);
 281                         pnp_write(PNP_IO_BASE_LOW(i), 0);
 282                 } else {
 283                         start = config->ic_port[i].ir_start;
 284                         pnp_write(PNP_IO_BASE_HIGH(i), (start >> 8) & 0xff);
 285                         pnp_write(PNP_IO_BASE_LOW(i), (start >> 0) & 0xff);
 286                 }
 287         }
 288         for (; i < ISA_PNP_NPORT; i++) {
 289                 pnp_write(PNP_IO_BASE_HIGH(i), 0);
 290                 pnp_write(PNP_IO_BASE_LOW(i), 0);
 291         }
 292
 293         for (i = 0; i < config->ic_nirq; i++) {
 294                 int irq;
 295
 296                 /* XXX: interrupt type */
 297                 if (config->ic_irqmask[i] == 0) {
 298                         pnp_write(PNP_IRQ_LEVEL(i), 0);
 299                         pnp_write(PNP_IRQ_TYPE(i), 2);
 300                 } else {
 301                         irq = ffs(config->ic_irqmask[i]) - 1;
 302                         pnp_write(PNP_IRQ_LEVEL(i), irq);
 303                         pnp_write(PNP_IRQ_TYPE(i), 2); /* XXX */
 304                 }
 305         }
 306         for (; i < ISA_PNP_NIRQ; i++) {
 307                 /*
 308                  * IRQ 0 is not a valid interrupt selection and
 309                  * represents no interrupt selection.
 310                  */
 311                 pnp_write(PNP_IRQ_LEVEL(i), 0);
 312                 pnp_write(PNP_IRQ_TYPE(i), 2);
 313         }
 314
 315         for (i = 0; i < config->ic_ndrq; i++) {
 316                 int drq;
 317
 318                 if (config->ic_drqmask[i] == 0) {
 319                         pnp_write(PNP_DMA_CHANNEL(i), 4);
 320                 } else {
 321                         drq = ffs(config->ic_drqmask[i]) - 1;
 322                         pnp_write(PNP_DMA_CHANNEL(i), drq);
 323                 }
 324         }
 325         for (; i < ISA_PNP_NDRQ; i++) {
 326                 /*
 327                  * DMA channel 4, the cascade channel is used to
 328                  * indicate no DMA channel is active.
 329                  */
 330                 pnp_write(PNP_DMA_CHANNEL(i), 4);
 331         }
 332
 333         pnp_write(PNP_ACTIVATE, enable ? 1 : 0);
 334
 335         /*
 336          * Wake everyone up again, we are finished.
 337          */
 338         pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY);
 339 }
 340
 341 /*
 342  * Process quirks for a logical device.. The card must be in Config state.
 343  */
 344 void
 345 pnp_check_quirks(uint32_t vendor_id, uint32_t logical_id, int ldn,
 346     struct isa_config *config)
 347 {
 348         struct pnp_quirk *qp;
 349
 350         for (qp = &pnp_quirks[0]; qp->vendor_id; qp++) {
 351                 if (qp->vendor_id == vendor_id
 352                     && (qp->logical_id == 0 || qp->logical_id == logical_id)) {
 353                         switch (qp->type) {
 354                         case PNP_QUIRK_WRITE_REG:
 355                                 pnp_write(PNP_SET_LDN, ldn);
 356                                 pnp_write(qp->arg1, qp->arg2);
 357                                 break;
 358                         case PNP_QUIRK_EXTRA_IO:
 359                                 if (config == NULL)
 360                                         break;
 361                                 if (qp->arg1 != 0) {
 362                                         config->ic_nport++;
 363                                         config->ic_port[config->ic_nport - 1] = config->ic_port[0];
 364                                         config->ic_port[config->ic_nport - 1].ir_start += qp->arg1;
 365                                         config->ic_port[config->ic_nport - 1].ir_end += qp->arg1;
 366                                 }
 367                                 if (qp->arg2 != 0) {
 368                                         config->ic_nport++;
 369                                         config->ic_port[config->ic_nport - 1] = config->ic_port[0];
 370                                         config->ic_port[config->ic_nport - 1].ir_start += qp->arg2;
 371                                         config->ic_port[config->ic_nport - 1].ir_end += qp->arg2;
 372                                 }
 373                                 break;
 374                         }
 375                 }
 376         }
 377 }
 378
 379 /*
 380  * Scan Resource Data for Logical Devices.
 381  *
 382  * This function exits as soon as it gets an error reading *ANY*
 383  * Resource Data or it reaches the end of Resource Data.  In the first
 384  * case the return value will be TRUE, FALSE otherwise.
 385  */
 386 static int
 387 pnp_create_devices(device_t parent, pnp_id *p, int csn,
 388     u_char *resources, int len)
 389 {
 390         u_char tag, *resp, *resinfo, *startres = NULL;
 391         int large_len, scanning = len, retval = FALSE;
 392         uint32_t logical_id;
 393         device_t dev = 0;
 394         int ldn = 0;
 395         struct pnp_set_config_arg *csnldn;
 396         char buf[100];
 397         char *desc = NULL;
 398
 399         resp = resources;
 400         while (scanning > 0) {
 401                 tag = *resp++;
 402                 scanning--;
 403                 if (PNP_RES_TYPE(tag) != 0) {
 404                         /* Large resource */
 405                         if (scanning < 2) {
 406                                 scanning = 0;
 407                                 continue;
 408                         }
 409                         large_len = resp[0] + (resp[1] << 8);
 410                         resp += 2;
 411
 412                         if (scanning < large_len) {
 413                                 scanning = 0;
 414                                 continue;
 415                         }
 416                         resinfo = resp;
 417                         resp += large_len;
 418                         scanning -= large_len;
 419
 420                         if (PNP_LRES_NUM(tag) == PNP_TAG_ID_ANSI) {
 421                                 if (dev) {
 422                                         /*
 423                                          * This is an optional device
 424                                          * identifier string. Skip it
 425                                          * for now.
 426                                          */
 427                                         continue;
 428                                 }
 429                                 /* else mandately card identifier string */
 430                                 if (large_len > sizeof(buf) - 1)
 431                                         large_len = sizeof(buf) - 1;
 432                                 bcopy(resinfo, buf, large_len);
 433
 434                                 /*
 435                                  * Trim trailing spaces.
 436                                  */
 437                                 while (buf[large_len-1] == ' ')
 438                                         large_len--;
 439                                 buf[large_len] = '\0';
 440                                 desc = buf;
 441                                 continue;
 442                         }
 443
 444                         continue;
 445                 }
 446
 447                 /* Small resource */
 448                 if (scanning < PNP_SRES_LEN(tag)) {
 449                         scanning = 0;
 450                         continue;
 451                 }
 452                 resinfo = resp;
 453                 resp += PNP_SRES_LEN(tag);
 454                 scanning -= PNP_SRES_LEN(tag);
 455
 456                 switch (PNP_SRES_NUM(tag)) {
 457                 case PNP_TAG_LOGICAL_DEVICE:
 458                         /*
 459                          * Parse the resources for the previous
 460                          * logical device (if any).
 461                          */
 462                         if (startres) {
 463                                 pnp_parse_resources(dev, startres,
 464                                     resinfo - startres - 1, ldn);
 465                                 dev = 0;
 466                                 startres = NULL;
 467                         }
 468
 469                         /*
 470                          * A new logical device. Scan for end of
 471                          * resources.
 472                          */
 473                         bcopy(resinfo, &logical_id, 4);
 474                         pnp_check_quirks(p->vendor_id, logical_id, ldn, NULL);
 475                         dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNP, NULL, -1);
 476                         if (desc)
 477                                 device_set_desc_copy(dev, desc);
 478                         else
 479                                 device_set_desc_copy(dev,
 480                                     pnp_eisaformat(logical_id));
 481                         isa_set_vendorid(dev, p->vendor_id);
 482                         isa_set_serial(dev, p->serial);
 483                         isa_set_logicalid(dev, logical_id);
 484                         isa_set_configattr(dev,
 485                             ISACFGATTR_CANDISABLE | ISACFGATTR_DYNAMIC);
 486                         csnldn = malloc(sizeof *csnldn, M_DEVBUF, M_NOWAIT);
 487                         if (!csnldn) {
 488                                 device_printf(parent, "out of memory\n");
 489                                 scanning = 0;
 490                                 break;
 491                         }
 492                         csnldn->csn = csn;
 493                         csnldn->ldn = ldn;
 494                         ISA_SET_CONFIG_CALLBACK(parent, dev, pnp_set_config,
 495                             csnldn);
 496                         isa_set_pnp_csn(dev, csn);
 497                         isa_set_pnp_ldn(dev, ldn);
 498                         ldn++;
 499                         startres = resp;
 500                         break;
 501
 502                 case PNP_TAG_END:
 503                         if (!startres) {
 504                                 device_printf(parent, "malformed resources\n");
 505                                 scanning = 0;
 506                                 break;
 507                         }
 508                         pnp_parse_resources(dev, startres,
 509                             resinfo - startres - 1, ldn);
 510                         dev = 0;
 511                         startres = NULL;
 512                         scanning = 0;
 513                         break;
 514
 515                 default:
 516                         /* Skip this resource */
 517                         break;
 518                 }
 519         }
 520
 521         return (retval);
 522 }
 523
 524 /*
 525  * Read 'amount' bytes of resources from the card, allocating memory
 526  * as needed. If a buffer is already available, it should be passed in
 527  * '*resourcesp' and its length in '*spacep'. The number of resource
 528  * bytes already in the buffer should be passed in '*lenp'. The memory
 529  * allocated will be returned in '*resourcesp' with its size and the
 530  * number of bytes of resources in '*spacep' and '*lenp' respectively.
 531  *
 532  * XXX: Multiple problems here, we forget to free() stuff in one
 533  * XXX: error return, and in another case we free (*resourcesp) but
 534  * XXX: don't tell the caller.
 535  */
 536 static int
 537 pnp_read_bytes(int amount, u_char **resourcesp, int *spacep, int *lenp)
 538 {
 539         u_char *resources = *resourcesp;
 540         u_char *newres;
 541         int space = *spacep;
 542         int len = *lenp;
 543
 544         if (space == 0) {
 545                 space = 1024;
 546                 resources = malloc(space, M_TEMP, M_NOWAIT);
 547                 if (!resources)
 548                         return (ENOMEM);
 549         }
 550
 551         if (len + amount > space) {
 552                 int extra = 1024;
 553                 while (len + amount > space + extra)
 554                         extra += 1024;
 555                 newres = malloc(space + extra, M_TEMP, M_NOWAIT);
 556                 if (!newres) {
 557                         /* XXX: free resources */
 558                         return (ENOMEM);
 559                 }
 560                 bcopy(resources, newres, len);
 561                 free(resources, M_TEMP);
 562                 resources = newres;
 563                 space += extra;
 564         }
 565
 566         if (pnp_get_resource_info(resources + len, amount) != amount)
 567                 return (EINVAL);
 568         len += amount;
 569
 570         *resourcesp = resources;
 571         *spacep = space;
 572         *lenp = len;
 573
 574         return (0);
 575 }
 576
 577 /*
 578  * Read all resources from the card, allocating memory as needed. If a
 579  * buffer is already available, it should be passed in '*resourcesp'
 580  * and its length in '*spacep'. The memory allocated will be returned
 581  * in '*resourcesp' with its size and the number of bytes of resources
 582  * in '*spacep' and '*lenp' respectively.
 583  */
 584 static int
 585 pnp_read_resources(u_char **resourcesp, int *spacep, int *lenp)
 586 {
 587         u_char *resources = *resourcesp;
 588         int space = *spacep;
 589         int len = 0;
 590         int error, done;
 591         u_char tag;
 592
 593         error = 0;
 594         done = 0;
 595         while (!done) {
 596                 error = pnp_read_bytes(1, &resources, &space, &len);
 597                 if (error)
 598                         goto out;
 599                 tag = resources[len-1];
 600                 if (PNP_RES_TYPE(tag) == 0) {
 601                         /*
 602                          * Small resource, read contents.
 603                          */
 604                         error = pnp_read_bytes(PNP_SRES_LEN(tag),
 605                             &resources, &space, &len);
 606                         if (error)
 607                                 goto out;
 608                         if (PNP_SRES_NUM(tag) == PNP_TAG_END)
 609                                 done = 1;
 610                 } else {
 611                         /*
 612                          * Large resource, read length and contents.
 613                          */
 614                         error = pnp_read_bytes(2, &resources, &space, &len);
 615                         if (error)
 616                                 goto out;
 617                         error = pnp_read_bytes(resources[len-2]
 618                             + (resources[len-1] << 8), &resources, &space,
 619                             &len);
 620                         if (error)
 621                                 goto out;
 622                 }
 623         }
 624
 625  out:
 626         *resourcesp = resources;
 627         *spacep = space;
 628         *lenp = len;
 629         return (error);
 630 }
 631
 632 /*
 633  * Run the isolation protocol. Use pnp_rd_port as the READ_DATA port
 634  * value (caller should try multiple READ_DATA locations before giving
 635  * up). Upon exiting, all cards are aware that they should use
 636  * pnp_rd_port as the READ_DATA port.
 637  *
 638  * In the first pass, a csn is assigned to each board and pnp_id's
 639  * are saved to an array, pnp_devices. In the second pass, each
 640  * card is woken up and the device configuration is called.
 641  */
 642 static int
 643 pnp_isolation_protocol(device_t parent)
 644 {
 645         int csn;
 646         pnp_id id;
 647         int found = 0, len;
 648         u_char *resources = NULL;
 649         int space = 0;
 650         int error;
 651
 652         /*
 653          * Put all cards into the Sleep state so that we can clear
 654          * their CSNs.
 655          */
 656         pnp_send_initiation_key();
 657
 658         /*
 659          * Clear the CSN for all cards.
 660          */
 661         pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_RESET_CSN);
 662
 663         /*
 664          * Move all cards to the Isolation state.
 665          */
 666         pnp_write(PNP_WAKE, 0);
 667
 668         /*
 669          * Tell them where the read point is going to be this time.
 670          */
 671         pnp_write(PNP_SET_RD_DATA, pnp_rd_port);
 672
 673         for (csn = 1; csn < PNP_MAX_CARDS; csn++) {
 674                 /*
 675                  * Start the serial isolation protocol.
 676                  */
 677                 outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION);
 678                 DELAY(1000);    /* Delay 1 msec */
 679
 680                 if (pnp_get_serial(&id)) {
 681                         /*
 682                          * We have read the id from a card
 683                          * successfully. The card which won the
 684                          * isolation protocol will be in Isolation
 685                          * mode and all others will be in Sleep.
 686                          * Program the CSN of the isolated card
 687                          * (taking it to Config state) and read its
 688                          * resources, creating devices as we find
 689                          * logical devices on the card.
 690                          */
 691                         pnp_write(PNP_SET_CSN, csn);
 692                         if (bootverbose)
 693                                 printf("Reading PnP configuration for %s.\n",
 694                                     pnp_eisaformat(id.vendor_id));
 695                         error = pnp_read_resources(&resources, &space, &len);
 696                         if (error)
 697                                 break;
 698                         pnp_create_devices(parent, &id, csn, resources, len);
 699                         found++;
 700                 } else
 701                         break;
 702
 703                 /*
 704                  * Put this card back to the Sleep state and
 705                  * simultaneously move all cards which don't have a
 706                  * CSN yet to Isolation state.
 707                  */
 708                 pnp_write(PNP_WAKE, 0);
 709         }
 710
 711         /*
 712          * Unless we have chosen the wrong read port, all cards will
 713          * be in Sleep state. Put them back into WaitForKey for
 714          * now. Their resources will be programmed later.
 715          */
 716         pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY);
 717
 718         /*
 719          * Cleanup.
 720          */
 721         if (resources)
 722                 free(resources, M_TEMP);
 723
 724         return (found);
 725 }
 726
 727
 728 /*
 729  * pnp_identify()
 730  *
 731  * autoconfiguration of pnp devices. This routine just runs the
 732  * isolation protocol over several ports, until one is successful.
 733  *
 734  * may be called more than once ?
 735  *
 736  */
 737
 738 static void
 739 pnp_identify(driver_t *driver, device_t parent)
 740 {
 741         int num_pnp_devs;
 742
 743         /* Try various READ_DATA ports from 0x203-0x3ff */
 744         for (pnp_rd_port = 0x80; (pnp_rd_port < 0xff); pnp_rd_port += 0x10) {
 745                 if (bootverbose)
 746                         printf("pnp_identify: Trying Read_Port at %x\n",
 747                             (pnp_rd_port << 2) | 0x3);
 748
 749                 num_pnp_devs = pnp_isolation_protocol(parent);
 750                 if (num_pnp_devs)
 751                         break;
 752         }
 753         if (bootverbose)
 754                 printf("PNP Identify complete\n");
 755 }
 756
 757 static device_method_t pnp_methods[] = {
 758         /* Device interface */
 759         DEVMETHOD(device_identify,      pnp_identify),
 760
 761         { 0, 0 }
 762 };
 763
 764 static driver_t pnp_driver = {
 765         "pnp",
 766         pnp_methods,
 767         1,                      /* no softc */
 768 };
 769
 770 static devclass_t pnp_devclass;
 771
 772 DRIVER_MODULE(pnp, isa, pnp_driver, pnp_devclass, 0, 0);