pnp.c revision 139267
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: head/sys/isa/pnp.c 139267 2004-12-24 21:53:21Z imp $"); 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/malloc.h> 38#include <isa/isavar.h> 39#include <isa/pnpreg.h> 40#include <isa/pnpvar.h> 41#include <machine/bus.h> 42 43typedef struct _pnp_id { 44 u_int32_t vendor_id; 45 u_int32_t serial; 46 u_char checksum; 47} pnp_id; 48 49struct pnp_set_config_arg { 50 int csn; /* Card number to configure */ 51 int ldn; /* Logical device on card */ 52}; 53 54struct pnp_quirk { 55 u_int32_t vendor_id; /* Vendor of the card */ 56 u_int32_t logical_id; /* ID of the device with quirk */ 57 int type; 58#define PNP_QUIRK_WRITE_REG 1 /* Need to write a pnp register */ 59#define PNP_QUIRK_EXTRA_IO 2 /* Has extra io ports */ 60 int arg1; 61 int arg2; 62}; 63 64struct pnp_quirk pnp_quirks[] = { 65 /* 66 * The Gravis UltraSound needs register 0xf2 to be set to 0xff 67 * to enable power. 68 * XXX need to know the logical device id. 69 */ 70 { 0x0100561e /* GRV0001 */, 0, 71 PNP_QUIRK_WRITE_REG, 0xf2, 0xff }, 72 /* 73 * An emu8000 does not give us other than the first 74 * port. 75 */ 76 { 0x26008c0e /* SB16 */, 0x21008c0e, 77 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 78 { 0x42008c0e /* SB32(CTL0042) */, 0x21008c0e, 79 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 80 { 0x44008c0e /* SB32(CTL0044) */, 0x21008c0e, 81 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 82 { 0x49008c0e /* SB32(CTL0049) */, 0x21008c0e, 83 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 84 { 0xf1008c0e /* SB32(CTL00f1) */, 0x21008c0e, 85 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 86 { 0xc1008c0e /* SB64(CTL00c1) */, 0x22008c0e, 87 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 88 { 0xc5008c0e /* SB64(CTL00c5) */, 0x22008c0e, 89 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 90 { 0xe4008c0e /* SB64(CTL00e4) */, 0x22008c0e, 91 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 92 93 { 0 } 94}; 95 96#ifdef PC98 97/* Some NEC PnP cards have 9 bytes serial code. */ 98static pnp_id necids[] = { 99 {0x4180a3b8, 0xffffffff, 0x00}, /* PC-9801CB-B04 (NEC8041) */ 100 {0x5181a3b8, 0xffffffff, 0x46}, /* PC-9821CB2-B04(NEC8151) */ 101 {0x5182a3b8, 0xffffffff, 0xb8}, /* PC-9801-XX (NEC8251) */ 102 {0x9181a3b8, 0xffffffff, 0x00}, /* PC-9801-120 (NEC8191) */ 103 {0, 0, 0} 104}; 105#endif 106 107/* The READ_DATA port that we are using currently */ 108static int pnp_rd_port; 109 110static void pnp_send_initiation_key(void); 111static int pnp_get_serial(pnp_id *p); 112static int pnp_isolation_protocol(device_t parent); 113 114char * 115pnp_eisaformat(u_int32_t id) 116{ 117 u_int8_t *data = (u_int8_t *) &id; 118 static char idbuf[8]; 119 const char hextoascii[] = "0123456789abcdef"; 120 121 idbuf[0] = '@' + ((data[0] & 0x7c) >> 2); 122 idbuf[1] = '@' + (((data[0] & 0x3) << 3) + ((data[1] & 0xe0) >> 5)); 123 idbuf[2] = '@' + (data[1] & 0x1f); 124 idbuf[3] = hextoascii[(data[2] >> 4)]; 125 idbuf[4] = hextoascii[(data[2] & 0xf)]; 126 idbuf[5] = hextoascii[(data[3] >> 4)]; 127 idbuf[6] = hextoascii[(data[3] & 0xf)]; 128 idbuf[7] = 0; 129 return(idbuf); 130} 131 132static void 133pnp_write(int d, u_char r) 134{ 135 outb (_PNP_ADDRESS, d); 136 outb (_PNP_WRITE_DATA, r); 137} 138 139/* 140 * Send Initiation LFSR as described in "Plug and Play ISA Specification", 141 * Intel May 94. 142 */ 143static void 144pnp_send_initiation_key() 145{ 146 int cur, i; 147 148 /* Reset the LSFR */ 149 outb(_PNP_ADDRESS, 0); 150 outb(_PNP_ADDRESS, 0); /* yes, we do need it twice! */ 151 152 cur = 0x6a; 153 outb(_PNP_ADDRESS, cur); 154 155 for (i = 1; i < 32; i++) { 156 cur = (cur >> 1) | (((cur ^ (cur >> 1)) << 7) & 0xff); 157 outb(_PNP_ADDRESS, cur); 158 } 159} 160 161 162/* 163 * Get the device's serial number. Returns 1 if the serial is valid. 164 */ 165static int 166pnp_get_serial(pnp_id *p) 167{ 168 int i, bit, valid = 0, sum = 0x6a; 169 u_char *data = (u_char *)p; 170 171 bzero(data, sizeof(char) * 9); 172 outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION); 173 for (i = 0; i < 72; i++) { 174 bit = inb((pnp_rd_port << 2) | 0x3) == 0x55; 175 DELAY(250); /* Delay 250 usec */ 176 177 /* Can't Short Circuit the next evaluation, so 'and' is last */ 178 bit = (inb((pnp_rd_port << 2) | 0x3) == 0xaa) && bit; 179 DELAY(250); /* Delay 250 usec */ 180 181 valid = valid || bit; 182 183 if (i < 64) 184 sum = (sum >> 1) | 185 (((sum ^ (sum >> 1) ^ bit) << 7) & 0xff); 186 187 data[i / 8] = (data[i / 8] >> 1) | (bit ? 0x80 : 0); 188 } 189 190 valid = valid && (data[8] == sum); 191 192 return valid; 193} 194 195/* 196 * Fill's the buffer with resource info from the device. 197 * Returns the number of characters read. 198 */ 199static int 200pnp_get_resource_info(u_char *buffer, int len) 201{ 202 int i, j, count; 203 u_char temp; 204 205 count = 0; 206 for (i = 0; i < len; i++) { 207 outb(_PNP_ADDRESS, PNP_STATUS); 208 for (j = 0; j < 100; j++) { 209 if ((inb((pnp_rd_port << 2) | 0x3)) & 0x1) 210 break; 211 DELAY(1); 212 } 213 if (j == 100) { 214 printf("PnP device failed to report resource data\n"); 215 return count; 216 } 217 outb(_PNP_ADDRESS, PNP_RESOURCE_DATA); 218 temp = inb((pnp_rd_port << 2) | 0x3); 219 if (buffer != NULL) 220 buffer[i] = temp; 221 count++; 222 } 223 return count; 224} 225 226/* 227 * This function is called after the bus has assigned resource 228 * locations for a logical device. 229 */ 230static void 231pnp_set_config(void *arg, struct isa_config *config, int enable) 232{ 233 int csn = ((struct pnp_set_config_arg *) arg)->csn; 234 int ldn = ((struct pnp_set_config_arg *) arg)->ldn; 235 int i; 236 237 /* 238 * First put all cards into Sleep state with the initiation 239 * key, then put our card into Config state. 240 */ 241 pnp_send_initiation_key(); 242 pnp_write(PNP_WAKE, csn); 243 244 /* 245 * Select our logical device so that we can program it. 246 */ 247 pnp_write(PNP_SET_LDN, ldn); 248 249 /* 250 * Constrain the number of resources we will try to program 251 */ 252 if (config->ic_nmem > ISA_PNP_NMEM) { 253 printf("too many ISA memory ranges (%d > %d)\n", config->ic_nmem, ISA_PNP_NMEM); 254 config->ic_nmem = ISA_PNP_NMEM; 255 } 256 if (config->ic_nport > ISA_PNP_NPORT) { 257 printf("too many ISA I/O ranges (%d > %d)\n", config->ic_nport, ISA_PNP_NPORT); 258 config->ic_nport = ISA_PNP_NPORT; 259 } 260 if (config->ic_nirq > ISA_PNP_NIRQ) { 261 printf("too many ISA IRQs (%d > %d)\n", config->ic_nirq, ISA_PNP_NIRQ); 262 config->ic_nirq = ISA_PNP_NIRQ; 263 } 264 if (config->ic_ndrq > ISA_PNP_NDRQ) { 265 printf("too many ISA DRQs (%d > %d)\n", config->ic_ndrq, ISA_PNP_NDRQ); 266 config->ic_ndrq = ISA_PNP_NDRQ; 267 } 268 269 /* 270 * Now program the resources. 271 */ 272 for (i = 0; i < config->ic_nmem; i++) { 273 u_int32_t start; 274 u_int32_t size; 275 276 /* XXX: should handle memory control register, 32 bit memory */ 277 if (config->ic_mem[i].ir_size == 0) { 278 pnp_write(PNP_MEM_BASE_HIGH(i), 0); 279 pnp_write(PNP_MEM_BASE_LOW(i), 0); 280 pnp_write(PNP_MEM_RANGE_HIGH(i), 0); 281 pnp_write(PNP_MEM_RANGE_LOW(i), 0); 282 } else { 283 start = config->ic_mem[i].ir_start; 284 size = config->ic_mem[i].ir_size; 285 if (start & 0xff) 286 panic("pnp_set_config: bogus memory assignment"); 287 pnp_write(PNP_MEM_BASE_HIGH(i), (start >> 16) & 0xff); 288 pnp_write(PNP_MEM_BASE_LOW(i), (start >> 8) & 0xff); 289 pnp_write(PNP_MEM_RANGE_HIGH(i), (size >> 16) & 0xff); 290 pnp_write(PNP_MEM_RANGE_LOW(i), (size >> 8) & 0xff); 291 } 292 } 293 for (; i < ISA_PNP_NMEM; i++) { 294 pnp_write(PNP_MEM_BASE_HIGH(i), 0); 295 pnp_write(PNP_MEM_BASE_LOW(i), 0); 296 pnp_write(PNP_MEM_RANGE_HIGH(i), 0); 297 pnp_write(PNP_MEM_RANGE_LOW(i), 0); 298 } 299 300 for (i = 0; i < config->ic_nport; i++) { 301 u_int32_t start; 302 303 if (config->ic_port[i].ir_size == 0) { 304 pnp_write(PNP_IO_BASE_HIGH(i), 0); 305 pnp_write(PNP_IO_BASE_LOW(i), 0); 306 } else { 307 start = config->ic_port[i].ir_start; 308 pnp_write(PNP_IO_BASE_HIGH(i), (start >> 8) & 0xff); 309 pnp_write(PNP_IO_BASE_LOW(i), (start >> 0) & 0xff); 310 } 311 } 312 for (; i < ISA_PNP_NPORT; i++) { 313 pnp_write(PNP_IO_BASE_HIGH(i), 0); 314 pnp_write(PNP_IO_BASE_LOW(i), 0); 315 } 316 317 for (i = 0; i < config->ic_nirq; i++) { 318 int irq; 319 320 /* XXX: interrupt type */ 321 if (config->ic_irqmask[i] == 0) { 322 pnp_write(PNP_IRQ_LEVEL(i), 0); 323 pnp_write(PNP_IRQ_TYPE(i), 2); 324 } else { 325 irq = ffs(config->ic_irqmask[i]) - 1; 326 pnp_write(PNP_IRQ_LEVEL(i), irq); 327 pnp_write(PNP_IRQ_TYPE(i), 2); /* XXX */ 328 } 329 } 330 for (; i < ISA_PNP_NIRQ; i++) { 331 /* 332 * IRQ 0 is not a valid interrupt selection and 333 * represents no interrupt selection. 334 */ 335 pnp_write(PNP_IRQ_LEVEL(i), 0); 336 pnp_write(PNP_IRQ_TYPE(i), 2); 337 } 338 339 for (i = 0; i < config->ic_ndrq; i++) { 340 int drq; 341 342 if (config->ic_drqmask[i] == 0) { 343 pnp_write(PNP_DMA_CHANNEL(i), 4); 344 } else { 345 drq = ffs(config->ic_drqmask[i]) - 1; 346 pnp_write(PNP_DMA_CHANNEL(i), drq); 347 } 348 } 349 for (; i < ISA_PNP_NDRQ; i++) { 350 /* 351 * DMA channel 4, the cascade channel is used to 352 * indicate no DMA channel is active. 353 */ 354 pnp_write(PNP_DMA_CHANNEL(i), 4); 355 } 356 357 pnp_write(PNP_ACTIVATE, enable ? 1 : 0); 358 359 /* 360 * Wake everyone up again, we are finished. 361 */ 362 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY); 363} 364 365/* 366 * Process quirks for a logical device.. The card must be in Config state. 367 */ 368void 369pnp_check_quirks(u_int32_t vendor_id, u_int32_t logical_id, int ldn, struct isa_config *config) 370{ 371 struct pnp_quirk *qp; 372 373 for (qp = &pnp_quirks[0]; qp->vendor_id; qp++) { 374 if (qp->vendor_id == vendor_id 375 && (qp->logical_id == 0 376 || qp->logical_id == logical_id)) { 377 switch (qp->type) { 378 case PNP_QUIRK_WRITE_REG: 379 pnp_write(PNP_SET_LDN, ldn); 380 pnp_write(qp->arg1, qp->arg2); 381 break; 382 case PNP_QUIRK_EXTRA_IO: 383 if (config == NULL) 384 break; 385 if (qp->arg1 != 0) { 386 config->ic_nport++; 387 config->ic_port[config->ic_nport - 1] = config->ic_port[0]; 388 config->ic_port[config->ic_nport - 1].ir_start += qp->arg1; 389 config->ic_port[config->ic_nport - 1].ir_end += qp->arg1; 390 } 391 if (qp->arg2 != 0) { 392 config->ic_nport++; 393 config->ic_port[config->ic_nport - 1] = config->ic_port[0]; 394 config->ic_port[config->ic_nport - 1].ir_start += qp->arg2; 395 config->ic_port[config->ic_nport - 1].ir_end += qp->arg2; 396 } 397 break; 398 } 399 } 400 } 401} 402 403/* 404 * Scan Resource Data for Logical Devices. 405 * 406 * This function exits as soon as it gets an error reading *ANY* 407 * Resource Data or it reaches the end of Resource Data. In the first 408 * case the return value will be TRUE, FALSE otherwise. 409 */ 410static int 411pnp_create_devices(device_t parent, pnp_id *p, int csn, 412 u_char *resources, int len) 413{ 414 u_char tag, *resp, *resinfo, *startres = 0; 415 int large_len, scanning = len, retval = FALSE; 416 u_int32_t logical_id; 417 device_t dev = 0; 418 int ldn = 0; 419 struct pnp_set_config_arg *csnldn; 420 char buf[100]; 421 char *desc = 0; 422 423 resp = resources; 424 while (scanning > 0) { 425 tag = *resp++; 426 scanning--; 427 if (PNP_RES_TYPE(tag) != 0) { 428 /* Large resource */ 429 if (scanning < 2) { 430 scanning = 0; 431 continue; 432 } 433 large_len = resp[0] + (resp[1] << 8); 434 resp += 2; 435 436 if (scanning < large_len) { 437 scanning = 0; 438 continue; 439 } 440 resinfo = resp; 441 resp += large_len; 442 scanning -= large_len; 443 444 if (PNP_LRES_NUM(tag) == PNP_TAG_ID_ANSI) { 445 if (dev) { 446 /* 447 * This is an optional device 448 * indentifier string. Skipt it 449 * for now. 450 */ 451 continue; 452 } 453 /* else mandately card identifier string */ 454 if (large_len > sizeof(buf) - 1) 455 large_len = sizeof(buf) - 1; 456 bcopy(resinfo, buf, large_len); 457 458 /* 459 * Trim trailing spaces. 460 */ 461 while (buf[large_len-1] == ' ') 462 large_len--; 463 buf[large_len] = '\0'; 464 desc = buf; 465 continue; 466 } 467 468 continue; 469 } 470 471 /* Small resource */ 472 if (scanning < PNP_SRES_LEN(tag)) { 473 scanning = 0; 474 continue; 475 } 476 resinfo = resp; 477 resp += PNP_SRES_LEN(tag); 478 scanning -= PNP_SRES_LEN(tag);; 479 480 switch (PNP_SRES_NUM(tag)) { 481 case PNP_TAG_LOGICAL_DEVICE: 482 /* 483 * Parse the resources for the previous 484 * logical device (if any). 485 */ 486 if (startres) { 487 pnp_parse_resources(dev, startres, 488 resinfo - startres - 1, 489 ldn); 490 dev = 0; 491 startres = 0; 492 } 493 494 /* 495 * A new logical device. Scan for end of 496 * resources. 497 */ 498 bcopy(resinfo, &logical_id, 4); 499 pnp_check_quirks(p->vendor_id, logical_id, ldn, NULL); 500 dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNP, NULL, -1); 501 if (desc) 502 device_set_desc_copy(dev, desc); 503 else 504 device_set_desc_copy(dev, 505 pnp_eisaformat(logical_id)); 506 isa_set_vendorid(dev, p->vendor_id); 507 isa_set_serial(dev, p->serial); 508 isa_set_logicalid(dev, logical_id); 509 isa_set_configattr(dev, 510 ISACFGATTR_CANDISABLE | 511 ISACFGATTR_DYNAMIC); 512 csnldn = malloc(sizeof *csnldn, M_DEVBUF, M_NOWAIT); 513 if (!csnldn) { 514 device_printf(parent, 515 "out of memory\n"); 516 scanning = 0; 517 break; 518 } 519 csnldn->csn = csn; 520 csnldn->ldn = ldn; 521 ISA_SET_CONFIG_CALLBACK(parent, dev, 522 pnp_set_config, csnldn); 523 ldn++; 524 startres = resp; 525 break; 526 527 case PNP_TAG_END: 528 if (!startres) { 529 device_printf(parent, 530 "malformed resources\n"); 531 scanning = 0; 532 break; 533 } 534 pnp_parse_resources(dev, startres, 535 resinfo - startres - 1, ldn); 536 dev = 0; 537 startres = 0; 538 scanning = 0; 539 break; 540 541 default: 542 /* Skip this resource */ 543 break; 544 } 545 } 546 547 return retval; 548} 549 550/* 551 * Read 'amount' bytes of resources from the card, allocating memory 552 * as needed. If a buffer is already available, it should be passed in 553 * '*resourcesp' and its length in '*spacep'. The number of resource 554 * bytes already in the buffer should be passed in '*lenp'. The memory 555 * allocated will be returned in '*resourcesp' with its size and the 556 * number of bytes of resources in '*spacep' and '*lenp' respectively. 557 * 558 * XXX: Multiple problems here, we forget to free() stuff in one 559 * XXX: error return, and in another case we free (*resourcesp) but 560 * XXX: don't tell the caller. 561 */ 562static int 563pnp_read_bytes(int amount, u_char **resourcesp, int *spacep, int *lenp) 564{ 565 u_char *resources = *resourcesp; 566 u_char *newres; 567 int space = *spacep; 568 int len = *lenp; 569 570 if (space == 0) { 571 space = 1024; 572 resources = malloc(space, M_TEMP, M_NOWAIT); 573 if (!resources) 574 return ENOMEM; 575 } 576 577 if (len + amount > space) { 578 int extra = 1024; 579 while (len + amount > space + extra) 580 extra += 1024; 581 newres = malloc(space + extra, M_TEMP, M_NOWAIT); 582 if (!newres) { 583 /* XXX: free resources */ 584 return ENOMEM; 585 } 586 bcopy(resources, newres, len); 587 free(resources, M_TEMP); 588 resources = newres; 589 space += extra; 590 } 591 592 if (pnp_get_resource_info(resources + len, amount) != amount) 593 return EINVAL; 594 len += amount; 595 596 *resourcesp = resources; 597 *spacep = space; 598 *lenp = len; 599 600 return 0; 601} 602 603/* 604 * Read all resources from the card, allocating memory as needed. If a 605 * buffer is already available, it should be passed in '*resourcesp' 606 * and its length in '*spacep'. The memory allocated will be returned 607 * in '*resourcesp' with its size and the number of bytes of resources 608 * in '*spacep' and '*lenp' respectively. 609 */ 610static int 611pnp_read_resources(u_char **resourcesp, int *spacep, int *lenp) 612{ 613 u_char *resources = *resourcesp; 614 int space = *spacep; 615 int len = 0; 616 int error, done; 617 u_char tag; 618 619 error = 0; 620 done = 0; 621 while (!done) { 622 error = pnp_read_bytes(1, &resources, &space, &len); 623 if (error) 624 goto out; 625 tag = resources[len-1]; 626 if (PNP_RES_TYPE(tag) == 0) { 627 /* 628 * Small resource, read contents. 629 */ 630 error = pnp_read_bytes(PNP_SRES_LEN(tag), 631 &resources, &space, &len); 632 if (error) 633 goto out; 634 if (PNP_SRES_NUM(tag) == PNP_TAG_END) 635 done = 1; 636 } else { 637 /* 638 * Large resource, read length and contents. 639 */ 640 error = pnp_read_bytes(2, &resources, &space, &len); 641 if (error) 642 goto out; 643 error = pnp_read_bytes(resources[len-2] 644 + (resources[len-1] << 8), 645 &resources, &space, &len); 646 if (error) 647 goto out; 648 } 649 } 650 651 out: 652 *resourcesp = resources; 653 *spacep = space; 654 *lenp = len; 655 return error; 656} 657 658/* 659 * Run the isolation protocol. Use pnp_rd_port as the READ_DATA port 660 * value (caller should try multiple READ_DATA locations before giving 661 * up). Upon exiting, all cards are aware that they should use 662 * pnp_rd_port as the READ_DATA port. 663 * 664 * In the first pass, a csn is assigned to each board and pnp_id's 665 * are saved to an array, pnp_devices. In the second pass, each 666 * card is woken up and the device configuration is called. 667 */ 668static int 669pnp_isolation_protocol(device_t parent) 670{ 671 int csn; 672 pnp_id id; 673 int found = 0, len; 674 u_char *resources = 0; 675 int space = 0; 676 int error; 677#ifdef PC98 678 int n, necpnp; 679 u_char buffer[10]; 680#endif 681 682 /* 683 * Put all cards into the Sleep state so that we can clear 684 * their CSNs. 685 */ 686 pnp_send_initiation_key(); 687 688 /* 689 * Clear the CSN for all cards. 690 */ 691 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_RESET_CSN); 692 693 /* 694 * Move all cards to the Isolation state. 695 */ 696 pnp_write(PNP_WAKE, 0); 697 698 /* 699 * Tell them where the read point is going to be this time. 700 */ 701 pnp_write(PNP_SET_RD_DATA, pnp_rd_port); 702 703 for (csn = 1; csn < PNP_MAX_CARDS; csn++) { 704 /* 705 * Start the serial isolation protocol. 706 */ 707 outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION); 708 DELAY(1000); /* Delay 1 msec */ 709 710 if (pnp_get_serial(&id)) { 711 /* 712 * We have read the id from a card 713 * successfully. The card which won the 714 * isolation protocol will be in Isolation 715 * mode and all others will be in Sleep. 716 * Program the CSN of the isolated card 717 * (taking it to Config state) and read its 718 * resources, creating devices as we find 719 * logical devices on the card. 720 */ 721 pnp_write(PNP_SET_CSN, csn); 722#ifdef PC98 723 if (bootverbose) 724 printf("PnP Vendor ID = %x\n", id.vendor_id); 725 /* Check for NEC PnP (9 bytes serial). */ 726 for (n = necpnp = 0; necids[n].vendor_id; n++) { 727 if (id.vendor_id == necids[n].vendor_id) { 728 necpnp = 1; 729 break; 730 } 731 } 732 if (necpnp) { 733 if (bootverbose) 734 printf("It seems to NEC-PnP card (%s).\n", 735 pnp_eisaformat(id.vendor_id)); 736 /* Read dummy 9 bytes serial area. */ 737 pnp_get_resource_info(buffer, 9); 738 } else { 739 if (bootverbose) 740 printf("It seems to Normal-ISA-PnP card (%s).\n", 741 pnp_eisaformat(id.vendor_id)); 742 } 743 if (bootverbose) 744 printf("Reading PnP configuration for %s.\n", 745 pnp_eisaformat(id.vendor_id)); 746#endif 747 error = pnp_read_resources(&resources, 748 &space, 749 &len); 750 if (error) 751 break; 752 pnp_create_devices(parent, &id, csn, 753 resources, len); 754 found++; 755 } else 756 break; 757 758 /* 759 * Put this card back to the Sleep state and 760 * simultaneously move all cards which don't have a 761 * CSN yet to Isolation state. 762 */ 763 pnp_write(PNP_WAKE, 0); 764 } 765 766 /* 767 * Unless we have chosen the wrong read port, all cards will 768 * be in Sleep state. Put them back into WaitForKey for 769 * now. Their resources will be programmed later. 770 */ 771 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY); 772 773 /* 774 * Cleanup. 775 */ 776 if (resources) 777 free(resources, M_TEMP); 778 779 return found; 780} 781 782 783/* 784 * pnp_identify() 785 * 786 * autoconfiguration of pnp devices. This routine just runs the 787 * isolation protocol over several ports, until one is successful. 788 * 789 * may be called more than once ? 790 * 791 */ 792 793static void 794pnp_identify(driver_t *driver, device_t parent) 795{ 796 int num_pnp_devs; 797 798 /* Try various READ_DATA ports from 0x203-0x3ff */ 799 for (pnp_rd_port = 0x80; (pnp_rd_port < 0xff); pnp_rd_port += 0x10) { 800 if (bootverbose) 801 printf("Trying Read_Port at %x\n", (pnp_rd_port << 2) | 0x3); 802 803 num_pnp_devs = pnp_isolation_protocol(parent); 804 if (num_pnp_devs) 805 break; 806 } 807} 808 809static device_method_t pnp_methods[] = { 810 /* Device interface */ 811 DEVMETHOD(device_identify, pnp_identify), 812 813 { 0, 0 } 814}; 815 816static driver_t pnp_driver = { 817 "pnp", 818 pnp_methods, 819 1, /* no softc */ 820}; 821 822static devclass_t pnp_devclass; 823 824DRIVER_MODULE(pnp, isa, pnp_driver, pnp_devclass, 0, 0); 825