pnp.c revision 139268
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 139268 2004-12-24 22:08:57Z 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 uint32_t vendor_id; 45 uint32_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 uint32_t vendor_id; /* Vendor of the card */ 56 uint32_t logical_id; /* ID of the device with quirk */ 57 int type; 58#define PNP_QUIRK_WRITE_REG 1 /* Need to write a pnp register */ 59#define PNP_QUIRK_EXTRA_IO 2 /* Has extra io ports */ 60 int arg1; 61 int arg2; 62}; 63 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(uint32_t id) 116{ 117 uint8_t *data = (uint8_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 if (i < 64) 183 sum = (sum >> 1) | 184 (((sum ^ (sum >> 1) ^ bit) << 7) & 0xff); 185 data[i / 8] = (data[i / 8] >> 1) | (bit ? 0x80 : 0); 186 } 187 188 valid = valid && (data[8] == sum); 189 190 return (valid); 191} 192 193/* 194 * Fill's the buffer with resource info from the device. 195 * Returns the number of characters read. 196 */ 197static int 198pnp_get_resource_info(u_char *buffer, int len) 199{ 200 int i, j, count; 201 u_char temp; 202 203 count = 0; 204 for (i = 0; i < len; i++) { 205 outb(_PNP_ADDRESS, PNP_STATUS); 206 for (j = 0; j < 100; j++) { 207 if ((inb((pnp_rd_port << 2) | 0x3)) & 0x1) 208 break; 209 DELAY(1); 210 } 211 if (j == 100) { 212 printf("PnP device failed to report resource data\n"); 213 return (count); 214 } 215 outb(_PNP_ADDRESS, PNP_RESOURCE_DATA); 216 temp = inb((pnp_rd_port << 2) | 0x3); 217 if (buffer != NULL) 218 buffer[i] = temp; 219 count++; 220 } 221 return (count); 222} 223 224/* 225 * This function is called after the bus has assigned resource 226 * locations for a logical device. 227 */ 228static void 229pnp_set_config(void *arg, struct isa_config *config, int enable) 230{ 231 int csn = ((struct pnp_set_config_arg *) arg)->csn; 232 int ldn = ((struct pnp_set_config_arg *) arg)->ldn; 233 int i; 234 235 /* 236 * First put all cards into Sleep state with the initiation 237 * key, then put our card into Config state. 238 */ 239 pnp_send_initiation_key(); 240 pnp_write(PNP_WAKE, csn); 241 242 /* 243 * Select our logical device so that we can program it. 244 */ 245 pnp_write(PNP_SET_LDN, ldn); 246 247 /* 248 * Constrain the number of resources we will try to program 249 */ 250 if (config->ic_nmem > ISA_PNP_NMEM) { 251 printf("too many ISA memory ranges (%d > %d)\n", 252 config->ic_nmem, ISA_PNP_NMEM); 253 config->ic_nmem = ISA_PNP_NMEM; 254 } 255 if (config->ic_nport > ISA_PNP_NPORT) { 256 printf("too many ISA I/O ranges (%d > %d)\n", config->ic_nport, 257 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, 262 ISA_PNP_NIRQ); 263 config->ic_nirq = ISA_PNP_NIRQ; 264 } 265 if (config->ic_ndrq > ISA_PNP_NDRQ) { 266 printf("too many ISA DRQs (%d > %d)\n", config->ic_ndrq, 267 ISA_PNP_NDRQ); 268 config->ic_ndrq = ISA_PNP_NDRQ; 269 } 270 271 /* 272 * Now program the resources. 273 */ 274 for (i = 0; i < config->ic_nmem; i++) { 275 uint32_t start; 276 uint32_t size; 277 278 /* XXX: should handle memory control register, 32 bit memory */ 279 if (config->ic_mem[i].ir_size == 0) { 280 pnp_write(PNP_MEM_BASE_HIGH(i), 0); 281 pnp_write(PNP_MEM_BASE_LOW(i), 0); 282 pnp_write(PNP_MEM_RANGE_HIGH(i), 0); 283 pnp_write(PNP_MEM_RANGE_LOW(i), 0); 284 } else { 285 start = config->ic_mem[i].ir_start; 286 size = config->ic_mem[i].ir_size; 287 if (start & 0xff) 288 panic("pnp_set_config: bogus memory assignment"); 289 pnp_write(PNP_MEM_BASE_HIGH(i), (start >> 16) & 0xff); 290 pnp_write(PNP_MEM_BASE_LOW(i), (start >> 8) & 0xff); 291 pnp_write(PNP_MEM_RANGE_HIGH(i), (size >> 16) & 0xff); 292 pnp_write(PNP_MEM_RANGE_LOW(i), (size >> 8) & 0xff); 293 } 294 } 295 for (; i < ISA_PNP_NMEM; i++) { 296 pnp_write(PNP_MEM_BASE_HIGH(i), 0); 297 pnp_write(PNP_MEM_BASE_LOW(i), 0); 298 pnp_write(PNP_MEM_RANGE_HIGH(i), 0); 299 pnp_write(PNP_MEM_RANGE_LOW(i), 0); 300 } 301 302 for (i = 0; i < config->ic_nport; i++) { 303 uint32_t start; 304 305 if (config->ic_port[i].ir_size == 0) { 306 pnp_write(PNP_IO_BASE_HIGH(i), 0); 307 pnp_write(PNP_IO_BASE_LOW(i), 0); 308 } else { 309 start = config->ic_port[i].ir_start; 310 pnp_write(PNP_IO_BASE_HIGH(i), (start >> 8) & 0xff); 311 pnp_write(PNP_IO_BASE_LOW(i), (start >> 0) & 0xff); 312 } 313 } 314 for (; i < ISA_PNP_NPORT; i++) { 315 pnp_write(PNP_IO_BASE_HIGH(i), 0); 316 pnp_write(PNP_IO_BASE_LOW(i), 0); 317 } 318 319 for (i = 0; i < config->ic_nirq; i++) { 320 int irq; 321 322 /* XXX: interrupt type */ 323 if (config->ic_irqmask[i] == 0) { 324 pnp_write(PNP_IRQ_LEVEL(i), 0); 325 pnp_write(PNP_IRQ_TYPE(i), 2); 326 } else { 327 irq = ffs(config->ic_irqmask[i]) - 1; 328 pnp_write(PNP_IRQ_LEVEL(i), irq); 329 pnp_write(PNP_IRQ_TYPE(i), 2); /* XXX */ 330 } 331 } 332 for (; i < ISA_PNP_NIRQ; i++) { 333 /* 334 * IRQ 0 is not a valid interrupt selection and 335 * represents no interrupt selection. 336 */ 337 pnp_write(PNP_IRQ_LEVEL(i), 0); 338 pnp_write(PNP_IRQ_TYPE(i), 2); 339 } 340 341 for (i = 0; i < config->ic_ndrq; i++) { 342 int drq; 343 344 if (config->ic_drqmask[i] == 0) { 345 pnp_write(PNP_DMA_CHANNEL(i), 4); 346 } else { 347 drq = ffs(config->ic_drqmask[i]) - 1; 348 pnp_write(PNP_DMA_CHANNEL(i), drq); 349 } 350 } 351 for (; i < ISA_PNP_NDRQ; i++) { 352 /* 353 * DMA channel 4, the cascade channel is used to 354 * indicate no DMA channel is active. 355 */ 356 pnp_write(PNP_DMA_CHANNEL(i), 4); 357 } 358 359 pnp_write(PNP_ACTIVATE, enable ? 1 : 0); 360 361 /* 362 * Wake everyone up again, we are finished. 363 */ 364 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY); 365} 366 367/* 368 * Process quirks for a logical device.. The card must be in Config state. 369 */ 370void 371pnp_check_quirks(uint32_t vendor_id, uint32_t logical_id, int ldn, 372 struct isa_config *config) 373{ 374 struct pnp_quirk *qp; 375 376 for (qp = &pnp_quirks[0]; qp->vendor_id; qp++) { 377 if (qp->vendor_id == vendor_id 378 && (qp->logical_id == 0 || qp->logical_id == logical_id)) { 379 switch (qp->type) { 380 case PNP_QUIRK_WRITE_REG: 381 pnp_write(PNP_SET_LDN, ldn); 382 pnp_write(qp->arg1, qp->arg2); 383 break; 384 case PNP_QUIRK_EXTRA_IO: 385 if (config == NULL) 386 break; 387 if (qp->arg1 != 0) { 388 config->ic_nport++; 389 config->ic_port[config->ic_nport - 1] = config->ic_port[0]; 390 config->ic_port[config->ic_nport - 1].ir_start += qp->arg1; 391 config->ic_port[config->ic_nport - 1].ir_end += qp->arg1; 392 } 393 if (qp->arg2 != 0) { 394 config->ic_nport++; 395 config->ic_port[config->ic_nport - 1] = config->ic_port[0]; 396 config->ic_port[config->ic_nport - 1].ir_start += qp->arg2; 397 config->ic_port[config->ic_nport - 1].ir_end += qp->arg2; 398 } 399 break; 400 } 401 } 402 } 403} 404 405/* 406 * Scan Resource Data for Logical Devices. 407 * 408 * This function exits as soon as it gets an error reading *ANY* 409 * Resource Data or it reaches the end of Resource Data. In the first 410 * case the return value will be TRUE, FALSE otherwise. 411 */ 412static int 413pnp_create_devices(device_t parent, pnp_id *p, int csn, 414 u_char *resources, int len) 415{ 416 u_char tag, *resp, *resinfo, *startres = 0; 417 int large_len, scanning = len, retval = FALSE; 418 uint32_t logical_id; 419 device_t dev = 0; 420 int ldn = 0; 421 struct pnp_set_config_arg *csnldn; 422 char buf[100]; 423 char *desc = 0; 424 425 resp = resources; 426 while (scanning > 0) { 427 tag = *resp++; 428 scanning--; 429 if (PNP_RES_TYPE(tag) != 0) { 430 /* Large resource */ 431 if (scanning < 2) { 432 scanning = 0; 433 continue; 434 } 435 large_len = resp[0] + (resp[1] << 8); 436 resp += 2; 437 438 if (scanning < large_len) { 439 scanning = 0; 440 continue; 441 } 442 resinfo = resp; 443 resp += large_len; 444 scanning -= large_len; 445 446 if (PNP_LRES_NUM(tag) == PNP_TAG_ID_ANSI) { 447 if (dev) { 448 /* 449 * This is an optional device 450 * indentifier string. Skipt it 451 * for now. 452 */ 453 continue; 454 } 455 /* else mandately card identifier string */ 456 if (large_len > sizeof(buf) - 1) 457 large_len = sizeof(buf) - 1; 458 bcopy(resinfo, buf, large_len); 459 460 /* 461 * Trim trailing spaces. 462 */ 463 while (buf[large_len-1] == ' ') 464 large_len--; 465 buf[large_len] = '\0'; 466 desc = buf; 467 continue; 468 } 469 470 continue; 471 } 472 473 /* Small resource */ 474 if (scanning < PNP_SRES_LEN(tag)) { 475 scanning = 0; 476 continue; 477 } 478 resinfo = resp; 479 resp += PNP_SRES_LEN(tag); 480 scanning -= PNP_SRES_LEN(tag);; 481 482 switch (PNP_SRES_NUM(tag)) { 483 case PNP_TAG_LOGICAL_DEVICE: 484 /* 485 * Parse the resources for the previous 486 * logical device (if any). 487 */ 488 if (startres) { 489 pnp_parse_resources(dev, startres, 490 resinfo - startres - 1, ldn); 491 dev = 0; 492 startres = 0; 493 } 494 495 /* 496 * A new logical device. Scan for end of 497 * resources. 498 */ 499 bcopy(resinfo, &logical_id, 4); 500 pnp_check_quirks(p->vendor_id, logical_id, ldn, NULL); 501 dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNP, NULL, -1); 502 if (desc) 503 device_set_desc_copy(dev, desc); 504 else 505 device_set_desc_copy(dev, 506 pnp_eisaformat(logical_id)); 507 isa_set_vendorid(dev, p->vendor_id); 508 isa_set_serial(dev, p->serial); 509 isa_set_logicalid(dev, logical_id); 510 isa_set_configattr(dev, 511 ISACFGATTR_CANDISABLE | ISACFGATTR_DYNAMIC); 512 csnldn = malloc(sizeof *csnldn, M_DEVBUF, M_NOWAIT); 513 if (!csnldn) { 514 device_printf(parent, "out of memory\n"); 515 scanning = 0; 516 break; 517 } 518 csnldn->csn = csn; 519 csnldn->ldn = ldn; 520 ISA_SET_CONFIG_CALLBACK(parent, dev, pnp_set_config, 521 csnldn); 522 ldn++; 523 startres = resp; 524 break; 525 526 case PNP_TAG_END: 527 if (!startres) { 528 device_printf(parent, "malformed resources\n"); 529 scanning = 0; 530 break; 531 } 532 pnp_parse_resources(dev, startres, 533 resinfo - startres - 1, ldn); 534 dev = 0; 535 startres = 0; 536 scanning = 0; 537 break; 538 539 default: 540 /* Skip this resource */ 541 break; 542 } 543 } 544 545 return (retval); 546} 547 548/* 549 * Read 'amount' bytes of resources from the card, allocating memory 550 * as needed. If a buffer is already available, it should be passed in 551 * '*resourcesp' and its length in '*spacep'. The number of resource 552 * bytes already in the buffer should be passed in '*lenp'. The memory 553 * allocated will be returned in '*resourcesp' with its size and the 554 * number of bytes of resources in '*spacep' and '*lenp' respectively. 555 * 556 * XXX: Multiple problems here, we forget to free() stuff in one 557 * XXX: error return, and in another case we free (*resourcesp) but 558 * XXX: don't tell the caller. 559 */ 560static int 561pnp_read_bytes(int amount, u_char **resourcesp, int *spacep, int *lenp) 562{ 563 u_char *resources = *resourcesp; 564 u_char *newres; 565 int space = *spacep; 566 int len = *lenp; 567 568 if (space == 0) { 569 space = 1024; 570 resources = malloc(space, M_TEMP, M_NOWAIT); 571 if (!resources) 572 return (ENOMEM); 573 } 574 575 if (len + amount > space) { 576 int extra = 1024; 577 while (len + amount > space + extra) 578 extra += 1024; 579 newres = malloc(space + extra, M_TEMP, M_NOWAIT); 580 if (!newres) { 581 /* XXX: free resources */ 582 return (ENOMEM); 583 } 584 bcopy(resources, newres, len); 585 free(resources, M_TEMP); 586 resources = newres; 587 space += extra; 588 } 589 590 if (pnp_get_resource_info(resources + len, amount) != amount) 591 return (EINVAL); 592 len += amount; 593 594 *resourcesp = resources; 595 *spacep = space; 596 *lenp = len; 597 598 return (0); 599} 600 601/* 602 * Read all resources from the card, allocating memory as needed. If a 603 * buffer is already available, it should be passed in '*resourcesp' 604 * and its length in '*spacep'. The memory allocated will be returned 605 * in '*resourcesp' with its size and the number of bytes of resources 606 * in '*spacep' and '*lenp' respectively. 607 */ 608static int 609pnp_read_resources(u_char **resourcesp, int *spacep, int *lenp) 610{ 611 u_char *resources = *resourcesp; 612 int space = *spacep; 613 int len = 0; 614 int error, done; 615 u_char tag; 616 617 error = 0; 618 done = 0; 619 while (!done) { 620 error = pnp_read_bytes(1, &resources, &space, &len); 621 if (error) 622 goto out; 623 tag = resources[len-1]; 624 if (PNP_RES_TYPE(tag) == 0) { 625 /* 626 * Small resource, read contents. 627 */ 628 error = pnp_read_bytes(PNP_SRES_LEN(tag), 629 &resources, &space, &len); 630 if (error) 631 goto out; 632 if (PNP_SRES_NUM(tag) == PNP_TAG_END) 633 done = 1; 634 } else { 635 /* 636 * Large resource, read length and contents. 637 */ 638 error = pnp_read_bytes(2, &resources, &space, &len); 639 if (error) 640 goto out; 641 error = pnp_read_bytes(resources[len-2] 642 + (resources[len-1] << 8), &resources, &space, 643 &len); 644 if (error) 645 goto out; 646 } 647 } 648 649 out: 650 *resourcesp = resources; 651 *spacep = space; 652 *lenp = len; 653 return (error); 654} 655 656/* 657 * Run the isolation protocol. Use pnp_rd_port as the READ_DATA port 658 * value (caller should try multiple READ_DATA locations before giving 659 * up). Upon exiting, all cards are aware that they should use 660 * pnp_rd_port as the READ_DATA port. 661 * 662 * In the first pass, a csn is assigned to each board and pnp_id's 663 * are saved to an array, pnp_devices. In the second pass, each 664 * card is woken up and the device configuration is called. 665 */ 666static int 667pnp_isolation_protocol(device_t parent) 668{ 669 int csn; 670 pnp_id id; 671 int found = 0, len; 672 u_char *resources = 0; 673 int space = 0; 674 int error; 675#ifdef PC98 676 int n, necpnp; 677 u_char buffer[10]; 678#endif 679 680 /* 681 * Put all cards into the Sleep state so that we can clear 682 * their CSNs. 683 */ 684 pnp_send_initiation_key(); 685 686 /* 687 * Clear the CSN for all cards. 688 */ 689 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_RESET_CSN); 690 691 /* 692 * Move all cards to the Isolation state. 693 */ 694 pnp_write(PNP_WAKE, 0); 695 696 /* 697 * Tell them where the read point is going to be this time. 698 */ 699 pnp_write(PNP_SET_RD_DATA, pnp_rd_port); 700 701 for (csn = 1; csn < PNP_MAX_CARDS; csn++) { 702 /* 703 * Start the serial isolation protocol. 704 */ 705 outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION); 706 DELAY(1000); /* Delay 1 msec */ 707 708 if (pnp_get_serial(&id)) { 709 /* 710 * We have read the id from a card 711 * successfully. The card which won the 712 * isolation protocol will be in Isolation 713 * mode and all others will be in Sleep. 714 * Program the CSN of the isolated card 715 * (taking it to Config state) and read its 716 * resources, creating devices as we find 717 * logical devices on the card. 718 */ 719 pnp_write(PNP_SET_CSN, csn); 720#ifdef PC98 721 if (bootverbose) 722 printf("PnP Vendor ID = %x\n", id.vendor_id); 723 /* Check for NEC PnP (9 bytes serial). */ 724 for (n = necpnp = 0; necids[n].vendor_id; n++) { 725 if (id.vendor_id == necids[n].vendor_id) { 726 necpnp = 1; 727 break; 728 } 729 } 730 if (necpnp) { 731 if (bootverbose) 732 printf("An NEC-PnP card (%s).\n", 733 pnp_eisaformat(id.vendor_id)); 734 /* Read dummy 9 bytes serial area. */ 735 pnp_get_resource_info(buffer, 9); 736 } else { 737 if (bootverbose) 738 printf("A Normal-ISA-PnP card (%s).\n", 739 pnp_eisaformat(id.vendor_id)); 740 } 741 if (bootverbose) 742 printf("Reading PnP configuration for %s.\n", 743 pnp_eisaformat(id.vendor_id)); 744#endif 745 error = pnp_read_resources(&resources, &space, &len); 746 if (error) 747 break; 748 pnp_create_devices(parent, &id, csn, resources, len); 749 found++; 750 } else 751 break; 752 753 /* 754 * Put this card back to the Sleep state and 755 * simultaneously move all cards which don't have a 756 * CSN yet to Isolation state. 757 */ 758 pnp_write(PNP_WAKE, 0); 759 } 760 761 /* 762 * Unless we have chosen the wrong read port, all cards will 763 * be in Sleep state. Put them back into WaitForKey for 764 * now. Their resources will be programmed later. 765 */ 766 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY); 767 768 /* 769 * Cleanup. 770 */ 771 if (resources) 772 free(resources, M_TEMP); 773 774 return (found); 775} 776 777 778/* 779 * pnp_identify() 780 * 781 * autoconfiguration of pnp devices. This routine just runs the 782 * isolation protocol over several ports, until one is successful. 783 * 784 * may be called more than once ? 785 * 786 */ 787 788static void 789pnp_identify(driver_t *driver, device_t parent) 790{ 791 int num_pnp_devs; 792 793 /* Try various READ_DATA ports from 0x203-0x3ff */ 794 for (pnp_rd_port = 0x80; (pnp_rd_port < 0xff); pnp_rd_port += 0x10) { 795 if (bootverbose) 796 printf("Trying Read_Port at %x\n", 797 (pnp_rd_port << 2) | 0x3); 798 799 num_pnp_devs = pnp_isolation_protocol(parent); 800 if (num_pnp_devs) 801 break; 802 } 803} 804 805static device_method_t pnp_methods[] = { 806 /* Device interface */ 807 DEVMETHOD(device_identify, pnp_identify), 808 809 { 0, 0 } 810}; 811 812static driver_t pnp_driver = { 813 "pnp", 814 pnp_methods, 815 1, /* no softc */ 816}; 817 818static devclass_t pnp_devclass; 819 820DRIVER_MODULE(pnp, isa, pnp_driver, pnp_devclass, 0, 0); 821