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