sys/isa/pnp.c

   1 /*
   2  * Copyright (c) 1996, Sujal M. Patel
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  *      from: pnp.c,v 1.11 1999/05/06 22:11:19 peter Exp
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  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 #ifdef PC98
  98 /* Some NEC PnP cards have 9 bytes serial code. */
  99 static pnp_id necids[] = {
 100         {0x4180a3b8, 0xffffffff, 0x00}, /* PC-9801CB-B04 (NEC8041) */
 101         {0x5181a3b8, 0xffffffff, 0x46}, /* PC-9821CB2-B04(NEC8151) */
 102         {0x5182a3b8, 0xffffffff, 0xb8}, /* PC-9801-XX    (NEC8251) */
 103         {0x9181a3b8, 0xffffffff, 0x00}, /* PC-9801-120   (NEC8191) */
 104         {0, 0, 0}
 105 };
 106 #endif
 107
 108 /* The READ_DATA port that we are using currently */
 109 static int pnp_rd_port;
 110
 111 static void   pnp_send_initiation_key(void);
 112 static int    pnp_get_serial(pnp_id *p);
 113 static int    pnp_isolation_protocol(device_t parent);
 114
 115 char *
 116 pnp_eisaformat(uint32_t id)
 117 {
 118         uint8_t *data;
 119         static char idbuf[8];
 120         const char  hextoascii[] = "0123456789abcdef";
 121
 122         id = htole32(id);
 123         data = (uint8_t *)&id;
 124         idbuf[0] = '@' + ((data[0] & 0x7c) >> 2);
 125         idbuf[1] = '@' + (((data[0] & 0x3) << 3) + ((data[1] & 0xe0) >> 5));
 126         idbuf[2] = '@' + (data[1] & 0x1f);
 127         idbuf[3] = hextoascii[(data[2] >> 4)];
 128         idbuf[4] = hextoascii[(data[2] & 0xf)];
 129         idbuf[5] = hextoascii[(data[3] >> 4)];
 130         idbuf[6] = hextoascii[(data[3] & 0xf)];
 131         idbuf[7] = 0;
 132         return(idbuf);
 133 }
 134
 135 static void
 136 pnp_write(int d, u_char r)
 137 {
 138         outb (_PNP_ADDRESS, d);
 139         outb (_PNP_WRITE_DATA, r);
 140 }
 141
 142 /*
 143  * Send Initiation LFSR as described in "Plug and Play ISA Specification",
 144  * Intel May 94.
 145  */
 146 static void
 147 pnp_send_initiation_key()
 148 {
 149         int cur, i;
 150
 151         /* Reset the LSFR */
 152         outb(_PNP_ADDRESS, 0);
 153         outb(_PNP_ADDRESS, 0); /* yes, we do need it twice! */
 154
 155         cur = 0x6a;
 156         outb(_PNP_ADDRESS, cur);
 157
 158         for (i = 1; i < 32; i++) {
 159                 cur = (cur >> 1) | (((cur ^ (cur >> 1)) << 7) & 0xff);
 160                 outb(_PNP_ADDRESS, cur);
 161         }
 162 }
 163
 164
 165 /*
 166  * Get the device's serial number.  Returns 1 if the serial is valid.
 167  */
 168 static int
 169 pnp_get_serial(pnp_id *p)
 170 {
 171         int i, bit, valid = 0, sum = 0x6a;
 172         u_char *data = (u_char *)p;
 173
 174         bzero(data, sizeof(char) * 9);
 175         outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION);
 176         for (i = 0; i < 72; i++) {
 177                 bit = inb((pnp_rd_port << 2) | 0x3) == 0x55;
 178                 DELAY(250);     /* Delay 250 usec */
 179
 180                 /* Can't Short Circuit the next evaluation, so 'and' is last */
 181                 bit = (inb((pnp_rd_port << 2) | 0x3) == 0xaa) && bit;
 182                 DELAY(250);     /* Delay 250 usec */
 183
 184                 valid = valid || bit;
 185                 if (i < 64)
 186                         sum = (sum >> 1) |
 187                           (((sum ^ (sum >> 1) ^ bit) << 7) & 0xff);
 188                 data[i / 8] = (data[i / 8] >> 1) | (bit ? 0x80 : 0);
 189         }
 190
 191         valid = valid && (data[8] == sum);
 192
 193         return (valid);
 194 }
 195
 196 /*
 197  * Fill's the buffer with resource info from the device.
 198  * Returns the number of characters read.
 199  */
 200 static int
 201 pnp_get_resource_info(u_char *buffer, int len)
 202 {
 203         int i, j, count;
 204         u_char temp;
 205
 206         count = 0;
 207         for (i = 0; i < len; i++) {
 208                 outb(_PNP_ADDRESS, PNP_STATUS);
 209                 for (j = 0; j < 100; j++) {
 210                         if ((inb((pnp_rd_port << 2) | 0x3)) & 0x1)
 211                                 break;
 212                         DELAY(1);
 213                 }
 214                 if (j == 100) {
 215                         printf("PnP device failed to report resource data\n");
 216                         return (count);
 217                 }
 218                 outb(_PNP_ADDRESS, PNP_RESOURCE_DATA);
 219                 temp = inb((pnp_rd_port << 2) | 0x3);
 220                 if (buffer != NULL)
 221                         buffer[i] = temp;
 222                 count++;
 223         }
 224         return (count);
 225 }
 226
 227 /*
 228  * This function is called after the bus has assigned resource
 229  * locations for a logical device.
 230  */
 231 static void
 232 pnp_set_config(void *arg, struct isa_config *config, int enable)
 233 {
 234         int csn = ((struct pnp_set_config_arg *) arg)->csn;
 235         int ldn = ((struct pnp_set_config_arg *) arg)->ldn;
 236         int i;
 237
 238         /*
 239          * First put all cards into Sleep state with the initiation
 240          * key, then put our card into Config state.
 241          */
 242         pnp_send_initiation_key();
 243         pnp_write(PNP_WAKE, csn);
 244
 245         /*
 246          * Select our logical device so that we can program it.
 247          */
 248         pnp_write(PNP_SET_LDN, ldn);
 249
 250         /*
 251          * Constrain the number of resources we will try to program
 252          */
 253         if (config->ic_nmem > ISA_PNP_NMEM) {
 254                 printf("too many ISA memory ranges (%d > %d)\n",
 255                     config->ic_nmem, ISA_PNP_NMEM);
 256                 config->ic_nmem = ISA_PNP_NMEM;
 257         }
 258         if (config->ic_nport > ISA_PNP_NPORT) {
 259                 printf("too many ISA I/O ranges (%d > %d)\n", config->ic_nport,
 260                     ISA_PNP_NPORT);
 261                 config->ic_nport = ISA_PNP_NPORT;
 262         }
 263         if (config->ic_nirq > ISA_PNP_NIRQ) {
 264                 printf("too many ISA IRQs (%d > %d)\n", config->ic_nirq,
 265                     ISA_PNP_NIRQ);
 266                 config->ic_nirq = ISA_PNP_NIRQ;
 267         }
 268         if (config->ic_ndrq > ISA_PNP_NDRQ) {
 269                 printf("too many ISA DRQs (%d > %d)\n", config->ic_ndrq,
 270                     ISA_PNP_NDRQ);
 271                 config->ic_ndrq = ISA_PNP_NDRQ;
 272         }
 273
 274         /*
 275          * Now program the resources.
 276          */
 277         for (i = 0; i < config->ic_nmem; i++) {
 278                 uint32_t start;
 279                 uint32_t size;
 280
 281                 /* XXX: should handle memory control register, 32 bit memory */
 282                 if (config->ic_mem[i].ir_size == 0) {
 283                         pnp_write(PNP_MEM_BASE_HIGH(i), 0);
 284                         pnp_write(PNP_MEM_BASE_LOW(i), 0);
 285                         pnp_write(PNP_MEM_RANGE_HIGH(i), 0);
 286                         pnp_write(PNP_MEM_RANGE_LOW(i), 0);
 287                 } else {
 288                         start = config->ic_mem[i].ir_start;
 289                         size =  config->ic_mem[i].ir_size;
 290                         if (start & 0xff)
 291                                 panic("pnp_set_config: bogus memory assignment");
 292                         pnp_write(PNP_MEM_BASE_HIGH(i), (start >> 16) & 0xff);
 293                         pnp_write(PNP_MEM_BASE_LOW(i), (start >> 8) & 0xff);
 294                         pnp_write(PNP_MEM_RANGE_HIGH(i), (size >> 16) & 0xff);
 295                         pnp_write(PNP_MEM_RANGE_LOW(i), (size >> 8) & 0xff);
 296                 }
 297         }
 298         for (; i < ISA_PNP_NMEM; i++) {
 299                 pnp_write(PNP_MEM_BASE_HIGH(i), 0);
 300                 pnp_write(PNP_MEM_BASE_LOW(i), 0);
 301                 pnp_write(PNP_MEM_RANGE_HIGH(i), 0);
 302                 pnp_write(PNP_MEM_RANGE_LOW(i), 0);
 303         }
 304
 305         for (i = 0; i < config->ic_nport; i++) {
 306                 uint32_t start;
 307
 308                 if (config->ic_port[i].ir_size == 0) {
 309                         pnp_write(PNP_IO_BASE_HIGH(i), 0);
 310                         pnp_write(PNP_IO_BASE_LOW(i), 0);
 311                 } else {
 312                         start = config->ic_port[i].ir_start;
 313                         pnp_write(PNP_IO_BASE_HIGH(i), (start >> 8) & 0xff);
 314                         pnp_write(PNP_IO_BASE_LOW(i), (start >> 0) & 0xff);
 315                 }
 316         }
 317         for (; i < ISA_PNP_NPORT; i++) {
 318                 pnp_write(PNP_IO_BASE_HIGH(i), 0);
 319                 pnp_write(PNP_IO_BASE_LOW(i), 0);
 320         }
 321
 322         for (i = 0; i < config->ic_nirq; i++) {
 323                 int irq;
 324
 325                 /* XXX: interrupt type */
 326                 if (config->ic_irqmask[i] == 0) {
 327                         pnp_write(PNP_IRQ_LEVEL(i), 0);
 328                         pnp_write(PNP_IRQ_TYPE(i), 2);
 329                 } else {
 330                         irq = ffs(config->ic_irqmask[i]) - 1;
 331                         pnp_write(PNP_IRQ_LEVEL(i), irq);
 332                         pnp_write(PNP_IRQ_TYPE(i), 2); /* XXX */
 333                 }
 334         }
 335         for (; i < ISA_PNP_NIRQ; i++) {
 336                 /*
 337                  * IRQ 0 is not a valid interrupt selection and
 338                  * represents no interrupt selection.
 339                  */
 340                 pnp_write(PNP_IRQ_LEVEL(i), 0);
 341                 pnp_write(PNP_IRQ_TYPE(i), 2);
 342         }
 343
 344         for (i = 0; i < config->ic_ndrq; i++) {
 345                 int drq;
 346
 347                 if (config->ic_drqmask[i] == 0) {
 348                         pnp_write(PNP_DMA_CHANNEL(i), 4);
 349                 } else {
 350                         drq = ffs(config->ic_drqmask[i]) - 1;
 351                         pnp_write(PNP_DMA_CHANNEL(i), drq);
 352                 }
 353         }
 354         for (; i < ISA_PNP_NDRQ; i++) {
 355                 /*
 356                  * DMA channel 4, the cascade channel is used to
 357                  * indicate no DMA channel is active.
 358                  */
 359                 pnp_write(PNP_DMA_CHANNEL(i), 4);
 360         }
 361
 362         pnp_write(PNP_ACTIVATE, enable ? 1 : 0);
 363
 364         /*
 365          * Wake everyone up again, we are finished.
 366          */
 367         pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY);
 368 }
 369
 370 /*
 371  * Process quirks for a logical device.. The card must be in Config state.
 372  */
 373 void
 374 pnp_check_quirks(uint32_t vendor_id, uint32_t logical_id, int ldn,
 375     struct isa_config *config)
 376 {
 377         struct pnp_quirk *qp;
 378
 379         for (qp = &pnp_quirks[0]; qp->vendor_id; qp++) {
 380                 if (qp->vendor_id == vendor_id
 381                     && (qp->logical_id == 0 || qp->logical_id == logical_id)) {
 382                         switch (qp->type) {
 383                         case PNP_QUIRK_WRITE_REG:
 384                                 pnp_write(PNP_SET_LDN, ldn);
 385                                 pnp_write(qp->arg1, qp->arg2);
 386                                 break;
 387                         case PNP_QUIRK_EXTRA_IO:
 388                                 if (config == NULL)
 389                                         break;
 390                                 if (qp->arg1 != 0) {
 391                                         config->ic_nport++;
 392                                         config->ic_port[config->ic_nport - 1] = config->ic_port[0];
 393                                         config->ic_port[config->ic_nport - 1].ir_start += qp->arg1;
 394                                         config->ic_port[config->ic_nport - 1].ir_end += qp->arg1;
 395                                 }
 396                                 if (qp->arg2 != 0) {
 397                                         config->ic_nport++;
 398                                         config->ic_port[config->ic_nport - 1] = config->ic_port[0];
 399                                         config->ic_port[config->ic_nport - 1].ir_start += qp->arg2;
 400                                         config->ic_port[config->ic_nport - 1].ir_end += qp->arg2;
 401                                 }
 402                                 break;
 403                         }
 404                 }
 405         }
 406 }
 407
 408 /*
 409  * Scan Resource Data for Logical Devices.
 410  *
 411  * This function exits as soon as it gets an error reading *ANY*
 412  * Resource Data or it reaches the end of Resource Data.  In the first
 413  * case the return value will be TRUE, FALSE otherwise.
 414  */
 415 static int
 416 pnp_create_devices(device_t parent, pnp_id *p, int csn,
 417     u_char *resources, int len)
 418 {
 419         u_char tag, *resp, *resinfo, *startres = 0;
 420         int large_len, scanning = len, retval = FALSE;
 421         uint32_t logical_id;
 422         device_t dev = 0;
 423         int ldn = 0;
 424         struct pnp_set_config_arg *csnldn;
 425         char buf[100];
 426         char *desc = 0;
 427
 428         resp = resources;
 429         while (scanning > 0) {
 430                 tag = *resp++;
 431                 scanning--;
 432                 if (PNP_RES_TYPE(tag) != 0) {
 433                         /* Large resource */
 434                         if (scanning < 2) {
 435                                 scanning = 0;
 436                                 continue;
 437                         }
 438                         large_len = resp[0] + (resp[1] << 8);
 439                         resp += 2;
 440
 441                         if (scanning < large_len) {
 442                                 scanning = 0;
 443                                 continue;
 444                         }
 445                         resinfo = resp;
 446                         resp += large_len;
 447                         scanning -= large_len;
 448
 449                         if (PNP_LRES_NUM(tag) == PNP_TAG_ID_ANSI) {
 450                                 if (dev) {
 451                                         /*
 452                                          * This is an optional device
 453                                          * indentifier string. Skipt it
 454                                          * for now.
 455                                          */
 456                                         continue;
 457                                 }
 458                                 /* else mandately card identifier string */
 459                                 if (large_len > sizeof(buf) - 1)
 460                                         large_len = sizeof(buf) - 1;
 461                                 bcopy(resinfo, buf, large_len);
 462
 463                                 /*
 464                                  * Trim trailing spaces.
 465                                  */
 466                                 while (buf[large_len-1] == ' ')
 467                                         large_len--;
 468                                 buf[large_len] = '\0';
 469                                 desc = buf;
 470                                 continue;
 471                         }
 472
 473                         continue;
 474                 }
 475
 476                 /* Small resource */
 477                 if (scanning < PNP_SRES_LEN(tag)) {
 478                         scanning = 0;
 479                         continue;
 480                 }
 481                 resinfo = resp;
 482                 resp += PNP_SRES_LEN(tag);
 483                 scanning -= PNP_SRES_LEN(tag);;
 484
 485                 switch (PNP_SRES_NUM(tag)) {
 486                 case PNP_TAG_LOGICAL_DEVICE:
 487                         /*
 488                          * Parse the resources for the previous
 489                          * logical device (if any).
 490                          */
 491                         if (startres) {
 492                                 pnp_parse_resources(dev, startres,
 493                                     resinfo - startres - 1, ldn);
 494                                 dev = 0;
 495                                 startres = 0;
 496                         }
 497
 498                         /*
 499                          * A new logical device. Scan for end of
 500                          * resources.
 501                          */
 502                         bcopy(resinfo, &logical_id, 4);
 503                         pnp_check_quirks(p->vendor_id, logical_id, ldn, NULL);
 504                         dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNP, NULL, -1);
 505                         if (desc)
 506                                 device_set_desc_copy(dev, desc);
 507                         else
 508                                 device_set_desc_copy(dev,
 509                                     pnp_eisaformat(logical_id));
 510                         isa_set_vendorid(dev, p->vendor_id);
 511                         isa_set_serial(dev, p->serial);
 512                         isa_set_logicalid(dev, logical_id);
 513                         isa_set_configattr(dev,
 514                             ISACFGATTR_CANDISABLE | ISACFGATTR_DYNAMIC);
 515                         csnldn = malloc(sizeof *csnldn, M_DEVBUF, M_NOWAIT);
 516                         if (!csnldn) {
 517                                 device_printf(parent, "out of memory\n");
 518                                 scanning = 0;
 519                                 break;
 520                         }
 521                         csnldn->csn = csn;
 522                         csnldn->ldn = ldn;
 523                         ISA_SET_CONFIG_CALLBACK(parent, dev, pnp_set_config,
 524                             csnldn);
 525                         ldn++;
 526                         startres = resp;
 527                         break;
 528
 529                 case PNP_TAG_END:
 530                         if (!startres) {
 531                                 device_printf(parent, "malformed resources\n");
 532                                 scanning = 0;
 533                                 break;
 534                         }
 535                         pnp_parse_resources(dev, startres,
 536                             resinfo - startres - 1, ldn);
 537                         dev = 0;
 538                         startres = 0;
 539                         scanning = 0;
 540                         break;
 541
 542                 default:
 543                         /* Skip this resource */
 544                         break;
 545                 }
 546         }
 547
 548         return (retval);
 549 }
 550
 551 /*
 552  * Read 'amount' bytes of resources from the card, allocating memory
 553  * as needed. If a buffer is already available, it should be passed in
 554  * '*resourcesp' and its length in '*spacep'. The number of resource
 555  * bytes already in the buffer should be passed in '*lenp'. The memory
 556  * allocated will be returned in '*resourcesp' with its size and the
 557  * number of bytes of resources in '*spacep' and '*lenp' respectively.
 558  *
 559  * XXX: Multiple problems here, we forget to free() stuff in one
 560  * XXX: error return, and in another case we free (*resourcesp) but
 561  * XXX: don't tell the caller.
 562  */
 563 static int
 564 pnp_read_bytes(int amount, u_char **resourcesp, int *spacep, int *lenp)
 565 {
 566         u_char *resources = *resourcesp;
 567         u_char *newres;
 568         int space = *spacep;
 569         int len = *lenp;
 570
 571         if (space == 0) {
 572                 space = 1024;
 573                 resources = malloc(space, M_TEMP, M_NOWAIT);
 574                 if (!resources)
 575                         return (ENOMEM);
 576         }
 577
 578         if (len + amount > space) {
 579                 int extra = 1024;
 580                 while (len + amount > space + extra)
 581                         extra += 1024;
 582                 newres = malloc(space + extra, M_TEMP, M_NOWAIT);
 583                 if (!newres) {
 584                         /* XXX: free resources */
 585                         return (ENOMEM);
 586                 }
 587                 bcopy(resources, newres, len);
 588                 free(resources, M_TEMP);
 589                 resources = newres;
 590                 space += extra;
 591         }
 592
 593         if (pnp_get_resource_info(resources + len, amount) != amount)
 594                 return (EINVAL);
 595         len += amount;
 596
 597         *resourcesp = resources;
 598         *spacep = space;
 599         *lenp = len;
 600
 601         return (0);
 602 }
 603
 604 /*
 605  * Read all resources from the card, allocating memory as needed. If a
 606  * buffer is already available, it should be passed in '*resourcesp'
 607  * and its length in '*spacep'. The memory allocated will be returned
 608  * in '*resourcesp' with its size and the number of bytes of resources
 609  * in '*spacep' and '*lenp' respectively.
 610  */
 611 static int
 612 pnp_read_resources(u_char **resourcesp, int *spacep, int *lenp)
 613 {
 614         u_char *resources = *resourcesp;
 615         int space = *spacep;
 616         int len = 0;
 617         int error, done;
 618         u_char tag;
 619
 620         error = 0;
 621         done = 0;
 622         while (!done) {
 623                 error = pnp_read_bytes(1, &resources, &space, &len);
 624                 if (error)
 625                         goto out;
 626                 tag = resources[len-1];
 627                 if (PNP_RES_TYPE(tag) == 0) {
 628                         /*
 629                          * Small resource, read contents.
 630                          */
 631                         error = pnp_read_bytes(PNP_SRES_LEN(tag),
 632                             &resources, &space, &len);
 633                         if (error)
 634                                 goto out;
 635                         if (PNP_SRES_NUM(tag) == PNP_TAG_END)
 636                                 done = 1;
 637                 } else {
 638                         /*
 639                          * Large resource, read length and contents.
 640                          */
 641                         error = pnp_read_bytes(2, &resources, &space, &len);
 642                         if (error)
 643                                 goto out;
 644                         error = pnp_read_bytes(resources[len-2]
 645                             + (resources[len-1] << 8), &resources, &space,
 646                             &len);
 647                         if (error)
 648                                 goto out;
 649                 }
 650         }
 651
 652  out:
 653         *resourcesp = resources;
 654         *spacep = space;
 655         *lenp = len;
 656         return (error);
 657 }
 658
 659 /*
 660  * Run the isolation protocol. Use pnp_rd_port as the READ_DATA port
 661  * value (caller should try multiple READ_DATA locations before giving
 662  * up). Upon exiting, all cards are aware that they should use
 663  * pnp_rd_port as the READ_DATA port.
 664  *
 665  * In the first pass, a csn is assigned to each board and pnp_id's
 666  * are saved to an array, pnp_devices. In the second pass, each
 667  * card is woken up and the device configuration is called.
 668  */
 669 static int
 670 pnp_isolation_protocol(device_t parent)
 671 {
 672         int csn;
 673         pnp_id id;
 674         int found = 0, len;
 675         u_char *resources = 0;
 676         int space = 0;
 677         int error;
 678 #ifdef PC98
 679         int n, necpnp;
 680         u_char buffer[10];
 681 #endif
 682
 683         /*
 684          * Put all cards into the Sleep state so that we can clear
 685          * their CSNs.
 686          */
 687         pnp_send_initiation_key();
 688
 689         /*
 690          * Clear the CSN for all cards.
 691          */
 692         pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_RESET_CSN);
 693
 694         /*
 695          * Move all cards to the Isolation state.
 696          */
 697         pnp_write(PNP_WAKE, 0);
 698
 699         /*
 700          * Tell them where the read point is going to be this time.
 701          */
 702         pnp_write(PNP_SET_RD_DATA, pnp_rd_port);
 703
 704         for (csn = 1; csn < PNP_MAX_CARDS; csn++) {
 705                 /*
 706                  * Start the serial isolation protocol.
 707                  */
 708                 outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION);
 709                 DELAY(1000);    /* Delay 1 msec */
 710
 711                 if (pnp_get_serial(&id)) {
 712                         /*
 713                          * We have read the id from a card
 714                          * successfully. The card which won the
 715                          * isolation protocol will be in Isolation
 716                          * mode and all others will be in Sleep.
 717                          * Program the CSN of the isolated card
 718                          * (taking it to Config state) and read its
 719                          * resources, creating devices as we find
 720                          * logical devices on the card.
 721                          */
 722                         pnp_write(PNP_SET_CSN, csn);
 723 #ifdef PC98
 724                         if (bootverbose)
 725                                 printf("PnP Vendor ID = %x\n", id.vendor_id);
 726                         /* Check for NEC PnP (9 bytes serial). */
 727                         for (n = necpnp = 0; necids[n].vendor_id; n++) {
 728                                 if (id.vendor_id == necids[n].vendor_id) {
 729                                         necpnp = 1;
 730                                         break;
 731                                 }
 732                         }
 733                         if (necpnp) {
 734                                 if (bootverbose)
 735                                         printf("An NEC-PnP card (%s).\n",
 736                                             pnp_eisaformat(id.vendor_id));
 737                                 /*  Read dummy 9 bytes serial area. */
 738                                 pnp_get_resource_info(buffer, 9);
 739                         } else {
 740                                 if (bootverbose)
 741                                         printf("A Normal-ISA-PnP card (%s).\n",
 742                                             pnp_eisaformat(id.vendor_id));
 743                         }
 744                         if (bootverbose)
 745                                 printf("Reading PnP configuration for %s.\n",
 746                                     pnp_eisaformat(id.vendor_id));
 747 #endif
 748                         error = pnp_read_resources(&resources, &space, &len);
 749                         if (error)
 750                                 break;
 751                         pnp_create_devices(parent, &id, csn, resources, len);
 752                         found++;
 753                 } else
 754                         break;
 755
 756                 /*
 757                  * Put this card back to the Sleep state and
 758                  * simultaneously move all cards which don't have a
 759                  * CSN yet to Isolation state.
 760                  */
 761                 pnp_write(PNP_WAKE, 0);
 762         }
 763
 764         /*
 765          * Unless we have chosen the wrong read port, all cards will
 766          * be in Sleep state. Put them back into WaitForKey for
 767          * now. Their resources will be programmed later.
 768          */
 769         pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY);
 770
 771         /*
 772          * Cleanup.
 773          */
 774         if (resources)
 775                 free(resources, M_TEMP);
 776
 777         return (found);
 778 }
 779
 780
 781 /*
 782  * pnp_identify()
 783  *
 784  * autoconfiguration of pnp devices. This routine just runs the
 785  * isolation protocol over several ports, until one is successful.
 786  *
 787  * may be called more than once ?
 788  *
 789  */
 790
 791 static void
 792 pnp_identify(driver_t *driver, device_t parent)
 793 {
 794         int num_pnp_devs;
 795
 796         /* Try various READ_DATA ports from 0x203-0x3ff */
 797         for (pnp_rd_port = 0x80; (pnp_rd_port < 0xff); pnp_rd_port += 0x10) {
 798                 if (bootverbose)
 799                         printf("pnp_identify: Trying Read_Port at %x\n",
 800                             (pnp_rd_port << 2) | 0x3);
 801
 802                 num_pnp_devs = pnp_isolation_protocol(parent);
 803                 if (num_pnp_devs)
 804                         break;
 805         }
 806         if (bootverbose)
 807                 printf("PNP Identify complete\n");
 808 }
 809
 810 static device_method_t pnp_methods[] = {
 811         /* Device interface */
 812         DEVMETHOD(device_identify,      pnp_identify),
 813
 814         { 0, 0 }
 815 };
 816
 817 static driver_t pnp_driver = {
 818         "pnp",
 819         pnp_methods,
 820         1,                      /* no softc */
 821 };
 822
 823 static devclass_t pnp_devclass;
 824
 825 DRIVER_MODULE(pnp, isa, pnp_driver, pnp_devclass, 0, 0);