pnp.c revision 67164
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 * $FreeBSD: head/sys/isa/pnp.c 67164 2000-10-15 14:19:01Z phk $ 27 * from: pnp.c,v 1.11 1999/05/06 22:11:19 peter Exp 28 */ 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/kernel.h> 33#include <sys/module.h> 34#include <sys/bus.h> 35#include <sys/malloc.h> 36#include <isa/isavar.h> 37#include <isa/pnpreg.h> 38#include <isa/pnpvar.h> 39#include <machine/bus.h> 40 41typedef struct _pnp_id { 42 u_int32_t vendor_id; 43 u_int32_t serial; 44 u_char checksum; 45} pnp_id; 46 47struct pnp_set_config_arg { 48 int csn; /* Card number to configure */ 49 int ldn; /* Logical device on card */ 50}; 51 52struct pnp_quirk { 53 u_int32_t vendor_id; /* Vendor of the card */ 54 u_int32_t logical_id; /* ID of the device with quirk */ 55 int type; 56#define PNP_QUIRK_WRITE_REG 1 /* Need to write a pnp register */ 57#define PNP_QUIRK_EXTRA_IO 2 /* Has extra io ports */ 58 int arg1; 59 int arg2; 60}; 61 62struct pnp_quirk pnp_quirks[] = { 63 /* 64 * The Gravis UltraSound needs register 0xf2 to be set to 0xff 65 * to enable power. 66 * XXX need to know the logical device id. 67 */ 68 { 0x0100561e /* GRV0001 */, 0, 69 PNP_QUIRK_WRITE_REG, 0xf2, 0xff }, 70 /* 71 * An emu8000 does not give us other than the first 72 * port. 73 */ 74 { 0x26008c0e /* SB16 */, 0x21008c0e, 75 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 76 { 0x42008c0e /* SB32(CTL0042) */, 0x21008c0e, 77 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 78 { 0x44008c0e /* SB32(CTL0044) */, 0x21008c0e, 79 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 80 { 0x49008c0e /* SB32(CTL0049) */, 0x21008c0e, 81 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 82 { 0xf1008c0e /* SB32(CTL00f1) */, 0x21008c0e, 83 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 84 { 0xc1008c0e /* SB64(CTL00c1) */, 0x22008c0e, 85 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 86 { 0xe4008c0e /* SB64(CTL00e4) */, 0x22008c0e, 87 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 88 89 { 0 } 90}; 91 92#if 0 93/* 94 * these entries are initialized using the autoconfig menu 95 * The struct is invalid (and must be initialized) if the first 96 * CSN is zero. The init code fills invalid entries with CSN 255 97 * which is not a supported value. 98 */ 99 100struct pnp_cinfo pnp_ldn_overrides[MAX_PNP_LDN] = { 101 { 0 } 102}; 103#endif 104 105/* The READ_DATA port that we are using currently */ 106static int pnp_rd_port; 107 108static void pnp_send_initiation_key(void); 109static int pnp_get_serial(pnp_id *p); 110static int pnp_isolation_protocol(device_t parent); 111 112char * 113pnp_eisaformat(u_int32_t id) 114{ 115 u_int8_t *data = (u_int8_t *) &id; 116 static char idbuf[8]; 117 const char hextoascii[] = "0123456789abcdef"; 118 119 idbuf[0] = '@' + ((data[0] & 0x7c) >> 2); 120 idbuf[1] = '@' + (((data[0] & 0x3) << 3) + ((data[1] & 0xe0) >> 5)); 121 idbuf[2] = '@' + (data[1] & 0x1f); 122 idbuf[3] = hextoascii[(data[2] >> 4)]; 123 idbuf[4] = hextoascii[(data[2] & 0xf)]; 124 idbuf[5] = hextoascii[(data[3] >> 4)]; 125 idbuf[6] = hextoascii[(data[3] & 0xf)]; 126 idbuf[7] = 0; 127 return(idbuf); 128} 129 130static void 131pnp_write(int d, u_char r) 132{ 133 outb (_PNP_ADDRESS, d); 134 outb (_PNP_WRITE_DATA, r); 135} 136 137#if 0 138 139static u_char 140pnp_read(int d) 141{ 142 outb (_PNP_ADDRESS, d); 143 return (inb(3 | (pnp_rd_port <<2))); 144} 145 146#endif 147 148/* 149 * Send Initiation LFSR as described in "Plug and Play ISA Specification", 150 * Intel May 94. 151 */ 152static void 153pnp_send_initiation_key() 154{ 155 int cur, i; 156 157 /* Reset the LSFR */ 158 outb(_PNP_ADDRESS, 0); 159 outb(_PNP_ADDRESS, 0); /* yes, we do need it twice! */ 160 161 cur = 0x6a; 162 outb(_PNP_ADDRESS, cur); 163 164 for (i = 1; i < 32; i++) { 165 cur = (cur >> 1) | (((cur ^ (cur >> 1)) << 7) & 0xff); 166 outb(_PNP_ADDRESS, cur); 167 } 168} 169 170 171/* 172 * Get the device's serial number. Returns 1 if the serial is valid. 173 */ 174static int 175pnp_get_serial(pnp_id *p) 176{ 177 int i, bit, valid = 0, sum = 0x6a; 178 u_char *data = (u_char *)p; 179 180 bzero(data, sizeof(char) * 9); 181 outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION); 182 for (i = 0; i < 72; i++) { 183 bit = inb((pnp_rd_port << 2) | 0x3) == 0x55; 184 DELAY(250); /* Delay 250 usec */ 185 186 /* Can't Short Circuit the next evaluation, so 'and' is last */ 187 bit = (inb((pnp_rd_port << 2) | 0x3) == 0xaa) && bit; 188 DELAY(250); /* Delay 250 usec */ 189 190 valid = valid || bit; 191 192 if (i < 64) 193 sum = (sum >> 1) | 194 (((sum ^ (sum >> 1) ^ bit) << 7) & 0xff); 195 196 data[i / 8] = (data[i / 8] >> 1) | (bit ? 0x80 : 0); 197 } 198 199 valid = valid && (data[8] == sum); 200 201 return valid; 202} 203 204/* 205 * Fill's the buffer with resource info from the device. 206 * Returns the number of characters read. 207 */ 208static int 209pnp_get_resource_info(u_char *buffer, int len) 210{ 211 int i, j, count; 212 u_char temp; 213 214 count = 0; 215 for (i = 0; i < len; i++) { 216 outb(_PNP_ADDRESS, PNP_STATUS); 217 for (j = 0; j < 100; j++) { 218 if ((inb((pnp_rd_port << 2) | 0x3)) & 0x1) 219 break; 220 DELAY(1); 221 } 222 if (j == 100) { 223 printf("PnP device failed to report resource data\n"); 224 return count; 225 } 226 outb(_PNP_ADDRESS, PNP_RESOURCE_DATA); 227 temp = inb((pnp_rd_port << 2) | 0x3); 228 if (buffer != NULL) 229 buffer[i] = temp; 230 count++; 231 } 232 return count; 233} 234 235#if 0 236/* 237 * write_pnp_parms initializes a logical device with the parms 238 * in d, and then activates the board if the last parameter is 1. 239 */ 240 241static int 242write_pnp_parms(struct pnp_cinfo *d, pnp_id *p, int ldn) 243{ 244 int i, empty = -1 ; 245 246 pnp_write (SET_LDN, ldn ); 247 i = pnp_read(SET_LDN) ; 248 if (i != ldn) { 249 printf("Warning: LDN %d does not exist\n", ldn); 250 } 251 for (i = 0; i < 8; i++) { 252 pnp_write(IO_CONFIG_BASE + i * 2, d->ic_port[i] >> 8 ); 253 pnp_write(IO_CONFIG_BASE + i * 2 + 1, d->ic_port[i] & 0xff ); 254 } 255 for (i = 0; i < 4; i++) { 256 pnp_write(MEM_CONFIG + i*8, (d->ic_mem[i].base >> 16) & 0xff ); 257 pnp_write(MEM_CONFIG + i*8+1, (d->ic_mem[i].base >> 8) & 0xff ); 258 pnp_write(MEM_CONFIG + i*8+2, d->ic_mem[i].control & 0xff ); 259 pnp_write(MEM_CONFIG + i*8+3, (d->ic_mem[i].range >> 16) & 0xff ); 260 pnp_write(MEM_CONFIG + i*8+4, (d->ic_mem[i].range >> 8) & 0xff ); 261 } 262 for (i = 0; i < 2; i++) { 263 pnp_write(IRQ_CONFIG + i*2 , d->irq[i] ); 264 pnp_write(IRQ_CONFIG + i*2 + 1, d->irq_type[i] ); 265 pnp_write(DRQ_CONFIG + i, d->drq[i] ); 266 } 267 /* 268 * store parameters read into the current kernel 269 * so manual editing next time is easier 270 */ 271 for (i = 0 ; i < MAX_PNP_LDN; i++) { 272 if (pnp_ldn_overrides[i].csn == d->csn && 273 pnp_ldn_overrides[i].ldn == ldn) { 274 d->flags = pnp_ldn_overrides[i].flags ; 275 pnp_ldn_overrides[i] = *d ; 276 break ; 277 } else if (pnp_ldn_overrides[i].csn < 1 || 278 pnp_ldn_overrides[i].csn == 255) 279 empty = i ; 280 } 281 if (i== MAX_PNP_LDN && empty != -1) 282 pnp_ldn_overrides[empty] = *d; 283 284 /* 285 * Here should really perform the range check, and 286 * return a failure if not successful. 287 */ 288 pnp_write (IO_RANGE_CHECK, 0); 289 DELAY(1000); /* XXX is it really necessary ? */ 290 pnp_write (ACTIVATE, d->enable ? 1 : 0); 291 DELAY(1000); /* XXX is it really necessary ? */ 292 return 1 ; 293} 294#endif 295 296/* 297 * This function is called after the bus has assigned resource 298 * locations for a logical device. 299 */ 300static void 301pnp_set_config(void *arg, struct isa_config *config, int enable) 302{ 303 int csn = ((struct pnp_set_config_arg *) arg)->csn; 304 int ldn = ((struct pnp_set_config_arg *) arg)->ldn; 305 int i; 306 307 /* 308 * First put all cards into Sleep state with the initiation 309 * key, then put our card into Config state. 310 */ 311 pnp_send_initiation_key(); 312 pnp_write(PNP_WAKE, csn); 313 314 /* 315 * Select our logical device so that we can program it. 316 */ 317 pnp_write(PNP_SET_LDN, ldn); 318 319 /* 320 * Constrain the number of resources we will try to program 321 */ 322 if (config->ic_nmem > ISA_PNP_NMEM) { 323 printf("too many ISA memory ranges (%d > %d)\n", config->ic_nmem, ISA_PNP_NMEM); 324 config->ic_nmem = ISA_PNP_NMEM; 325 } 326 if (config->ic_nport > ISA_PNP_NPORT) { 327 printf("too many ISA I/O ranges (%d > %d)\n", config->ic_nport, ISA_PNP_NPORT); 328 config->ic_nport = ISA_PNP_NPORT; 329 } 330 if (config->ic_nirq > ISA_PNP_NIRQ) { 331 printf("too many ISA IRQs (%d > %d)\n", config->ic_nirq, ISA_PNP_NIRQ); 332 config->ic_nirq = ISA_PNP_NIRQ; 333 } 334 if (config->ic_ndrq > ISA_PNP_NDRQ) { 335 printf("too many ISA DRQs (%d > %d)\n", config->ic_ndrq, ISA_PNP_NDRQ); 336 config->ic_ndrq = ISA_PNP_NDRQ; 337 } 338 339 /* 340 * Now program the resources. 341 */ 342 for (i = 0; i < config->ic_nmem; i++) { 343 u_int32_t start = config->ic_mem[i].ir_start; 344 u_int32_t size = config->ic_mem[i].ir_size; 345 if (start & 0xff) 346 panic("pnp_set_config: bogus memory assignment"); 347 pnp_write(PNP_MEM_BASE_HIGH(i), (start >> 16) & 0xff); 348 pnp_write(PNP_MEM_BASE_LOW(i), (start >> 8) & 0xff); 349 pnp_write(PNP_MEM_RANGE_HIGH(i), (size >> 16) & 0xff); 350 pnp_write(PNP_MEM_RANGE_LOW(i), (size >> 8) & 0xff); 351 } 352 for (; i < ISA_PNP_NMEM; i++) { 353 pnp_write(PNP_MEM_BASE_HIGH(i), 0); 354 pnp_write(PNP_MEM_BASE_LOW(i), 0); 355 pnp_write(PNP_MEM_RANGE_HIGH(i), 0); 356 pnp_write(PNP_MEM_RANGE_LOW(i), 0); 357 } 358 359 for (i = 0; i < config->ic_nport; i++) { 360 u_int32_t start = config->ic_port[i].ir_start; 361 pnp_write(PNP_IO_BASE_HIGH(i), (start >> 8) & 0xff); 362 pnp_write(PNP_IO_BASE_LOW(i), (start >> 0) & 0xff); 363 } 364 for (; i < ISA_PNP_NPORT; i++) { 365 pnp_write(PNP_IO_BASE_HIGH(i), 0); 366 pnp_write(PNP_IO_BASE_LOW(i), 0); 367 } 368 369 for (i = 0; i < config->ic_nirq; i++) { 370 int irq = ffs(config->ic_irqmask[i]) - 1; 371 pnp_write(PNP_IRQ_LEVEL(i), irq); 372 pnp_write(PNP_IRQ_TYPE(i), 2); /* XXX */ 373 } 374 for (; i < ISA_PNP_NIRQ; i++) { 375 /* 376 * IRQ 0 is not a valid interrupt selection and 377 * represents no interrupt selection. 378 */ 379 pnp_write(PNP_IRQ_LEVEL(i), 0); 380 } 381 382 for (i = 0; i < config->ic_ndrq; i++) { 383 int drq = ffs(config->ic_drqmask[i]) - 1; 384 pnp_write(PNP_DMA_CHANNEL(i), drq); 385 } 386 for (; i < ISA_PNP_NDRQ; i++) { 387 /* 388 * DMA channel 4, the cascade channel is used to 389 * indicate no DMA channel is active. 390 */ 391 pnp_write(PNP_DMA_CHANNEL(i), 4); 392 } 393 394 pnp_write(PNP_ACTIVATE, enable ? 1 : 0); 395 396 /* 397 * Wake everyone up again, we are finished. 398 */ 399 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY); 400} 401 402/* 403 * Process quirks for a logical device.. The card must be in Config state. 404 */ 405void 406pnp_check_quirks(u_int32_t vendor_id, u_int32_t logical_id, int ldn, struct isa_config *config) 407{ 408 struct pnp_quirk *qp; 409 410 for (qp = &pnp_quirks[0]; qp->vendor_id; qp++) { 411 if (qp->vendor_id == vendor_id 412 && (qp->logical_id == 0 413 || qp->logical_id == logical_id)) { 414 switch (qp->type) { 415 case PNP_QUIRK_WRITE_REG: 416 pnp_write(PNP_SET_LDN, ldn); 417 pnp_write(qp->arg1, qp->arg2); 418 break; 419 case PNP_QUIRK_EXTRA_IO: 420 if (config == NULL) 421 break; 422 if (qp->arg1 != 0) { 423 config->ic_nport++; 424 config->ic_port[config->ic_nport - 1] = config->ic_port[0]; 425 config->ic_port[config->ic_nport - 1].ir_start += qp->arg1; 426 config->ic_port[config->ic_nport - 1].ir_end += qp->arg1; 427 } 428 if (qp->arg2 != 0) { 429 config->ic_nport++; 430 config->ic_port[config->ic_nport - 1] = config->ic_port[0]; 431 config->ic_port[config->ic_nport - 1].ir_start += qp->arg2; 432 config->ic_port[config->ic_nport - 1].ir_end += qp->arg2; 433 } 434 break; 435 } 436 } 437 } 438} 439 440/* 441 * Scan Resource Data for Logical Devices. 442 * 443 * This function exits as soon as it gets an error reading *ANY* 444 * Resource Data or it reaches the end of Resource Data. In the first 445 * case the return value will be TRUE, FALSE otherwise. 446 */ 447static int 448pnp_create_devices(device_t parent, pnp_id *p, int csn, 449 u_char *resources, int len) 450{ 451 u_char tag, *resp, *resinfo, *startres = 0; 452 int large_len, scanning = len, retval = FALSE; 453 u_int32_t logical_id; 454 u_int32_t compat_id; 455 device_t dev = 0; 456 int ldn = 0; 457 struct pnp_set_config_arg *csnldn; 458 char buf[100]; 459 char *desc = 0; 460 461 resp = resources; 462 while (scanning > 0) { 463 tag = *resp++; 464 scanning--; 465 if (PNP_RES_TYPE(tag) != 0) { 466 /* Large resource */ 467 if (scanning < 2) { 468 scanning = 0; 469 continue; 470 } 471 large_len = resp[0] + (resp[1] << 8); 472 resp += 2; 473 474 if (scanning < large_len) { 475 scanning = 0; 476 continue; 477 } 478 resinfo = resp; 479 resp += large_len; 480 scanning -= large_len; 481 482 if (PNP_LRES_NUM(tag) == PNP_TAG_ID_ANSI) { 483 if (large_len > sizeof(buf) - 1) 484 large_len = sizeof(buf) - 1; 485 bcopy(resinfo, buf, large_len); 486 487 /* 488 * Trim trailing spaces. 489 */ 490 while (buf[large_len-1] == ' ') 491 large_len--; 492 buf[large_len] = '\0'; 493 desc = buf; 494 if (dev) 495 device_set_desc_copy(dev, desc); 496 continue; 497 } 498 499 continue; 500 } 501 502 /* Small resource */ 503 if (scanning < PNP_SRES_LEN(tag)) { 504 scanning = 0; 505 continue; 506 } 507 resinfo = resp; 508 resp += PNP_SRES_LEN(tag); 509 scanning -= PNP_SRES_LEN(tag);; 510 511 switch (PNP_SRES_NUM(tag)) { 512 case PNP_TAG_LOGICAL_DEVICE: 513 /* 514 * Parse the resources for the previous 515 * logical device (if any). 516 */ 517 if (startres) { 518 pnp_parse_resources(dev, startres, 519 resinfo - startres - 1, 520 p->vendor_id, logical_id, ldn); 521 dev = 0; 522 startres = 0; 523 } 524 525 /* 526 * A new logical device. Scan for end of 527 * resources. 528 */ 529 bcopy(resinfo, &logical_id, 4); 530 pnp_check_quirks(p->vendor_id, logical_id, ldn, NULL); 531 compat_id = 0; 532 dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNP, NULL, -1); 533 if (desc) 534 device_set_desc_copy(dev, desc); 535 isa_set_vendorid(dev, p->vendor_id); 536 isa_set_serial(dev, p->serial); 537 isa_set_logicalid(dev, logical_id); 538 csnldn = malloc(sizeof *csnldn, M_DEVBUF, M_NOWAIT); 539 if (!csnldn) { 540 device_printf(parent, 541 "out of memory\n"); 542 scanning = 0; 543 break; 544 } 545 csnldn->csn = csn; 546 csnldn->ldn = ldn; 547 ISA_SET_CONFIG_CALLBACK(parent, dev, 548 pnp_set_config, csnldn); 549 ldn++; 550 startres = resp; 551 break; 552 553 case PNP_TAG_END: 554 if (!startres) { 555 device_printf(parent, 556 "malformed resources\n"); 557 scanning = 0; 558 break; 559 } 560 pnp_parse_resources(dev, startres, 561 resinfo - startres - 1, 562 p->vendor_id, logical_id, ldn); 563 dev = 0; 564 startres = 0; 565 scanning = 0; 566 break; 567 568 default: 569 /* Skip this resource */ 570 break; 571 } 572 } 573 574 return retval; 575} 576 577/* 578 * Read 'amount' bytes of resources from the card, allocating memory 579 * as needed. If a buffer is already available, it should be passed in 580 * '*resourcesp' and its length in '*spacep'. The number of resource 581 * bytes already in the buffer should be passed in '*lenp'. The memory 582 * allocated will be returned in '*resourcesp' with its size and the 583 * number of bytes of resources in '*spacep' and '*lenp' respectively. 584 */ 585static int 586pnp_read_bytes(int amount, u_char **resourcesp, int *spacep, int *lenp) 587{ 588 u_char *resources = *resourcesp; 589 u_char *newres; 590 int space = *spacep; 591 int len = *lenp; 592 593 if (space == 0) { 594 space = 1024; 595 resources = malloc(space, M_TEMP, M_NOWAIT); 596 if (!resources) 597 return ENOMEM; 598 } 599 600 if (len + amount > space) { 601 int extra = 1024; 602 while (len + amount > space + extra) 603 extra += 1024; 604 newres = malloc(space + extra, M_TEMP, M_NOWAIT); 605 if (!newres) 606 return ENOMEM; 607 bcopy(resources, newres, len); 608 free(resources, M_TEMP); 609 resources = newres; 610 space += extra; 611 } 612 613 if (pnp_get_resource_info(resources + len, amount) != amount) 614 return EINVAL; 615 len += amount; 616 617 *resourcesp = resources; 618 *spacep = space; 619 *lenp = len; 620 621 return 0; 622} 623 624/* 625 * Read all resources from the card, allocating memory as needed. If a 626 * buffer is already available, it should be passed in '*resourcesp' 627 * and its length in '*spacep'. The memory allocated will be returned 628 * in '*resourcesp' with its size and the number of bytes of resources 629 * in '*spacep' and '*lenp' respectively. 630 */ 631static int 632pnp_read_resources(u_char **resourcesp, int *spacep, int *lenp) 633{ 634 u_char *resources = *resourcesp; 635 int space = *spacep; 636 int len = 0; 637 int error, done; 638 u_char tag; 639 640 error = 0; 641 done = 0; 642 while (!done) { 643 error = pnp_read_bytes(1, &resources, &space, &len); 644 if (error) 645 goto out; 646 tag = resources[len-1]; 647 if (PNP_RES_TYPE(tag) == 0) { 648 /* 649 * Small resource, read contents. 650 */ 651 error = pnp_read_bytes(PNP_SRES_LEN(tag), 652 &resources, &space, &len); 653 if (error) 654 goto out; 655 if (PNP_SRES_NUM(tag) == PNP_TAG_END) 656 done = 1; 657 } else { 658 /* 659 * Large resource, read length and contents. 660 */ 661 error = pnp_read_bytes(2, &resources, &space, &len); 662 if (error) 663 goto out; 664 error = pnp_read_bytes(resources[len-2] 665 + (resources[len-1] << 8), 666 &resources, &space, &len); 667 if (error) 668 goto out; 669 } 670 } 671 672 out: 673 *resourcesp = resources; 674 *spacep = space; 675 *lenp = len; 676 return error; 677} 678 679/* 680 * Run the isolation protocol. Use pnp_rd_port as the READ_DATA port 681 * value (caller should try multiple READ_DATA locations before giving 682 * up). Upon exiting, all cards are aware that they should use 683 * pnp_rd_port as the READ_DATA port. 684 * 685 * In the first pass, a csn is assigned to each board and pnp_id's 686 * are saved to an array, pnp_devices. In the second pass, each 687 * card is woken up and the device configuration is called. 688 */ 689static int 690pnp_isolation_protocol(device_t parent) 691{ 692 int csn; 693 pnp_id id; 694 int found = 0, len; 695 u_char *resources = 0; 696 int space = 0; 697 int error; 698 699 /* 700 * Put all cards into the Sleep state so that we can clear 701 * their CSNs. 702 */ 703 pnp_send_initiation_key(); 704 705 /* 706 * Clear the CSN for all cards. 707 */ 708 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_RESET_CSN); 709 710 /* 711 * Move all cards to the Isolation state. 712 */ 713 pnp_write(PNP_WAKE, 0); 714 715 /* 716 * Tell them where the read point is going to be this time. 717 */ 718 pnp_write(PNP_SET_RD_DATA, pnp_rd_port); 719 720 for (csn = 1; csn < PNP_MAX_CARDS; csn++) { 721 /* 722 * Start the serial isolation protocol. 723 */ 724 outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION); 725 DELAY(1000); /* Delay 1 msec */ 726 727 if (pnp_get_serial(&id)) { 728 /* 729 * We have read the id from a card 730 * successfully. The card which won the 731 * isolation protocol will be in Isolation 732 * mode and all others will be in Sleep. 733 * Program the CSN of the isolated card 734 * (taking it to Config state) and read its 735 * resources, creating devices as we find 736 * logical devices on the card. 737 */ 738 pnp_write(PNP_SET_CSN, csn); 739 error = pnp_read_resources(&resources, 740 &space, 741 &len); 742 if (error) 743 break; 744 pnp_create_devices(parent, &id, csn, 745 resources, len); 746 found++; 747 } else 748 break; 749 750 /* 751 * Put this card back to the Sleep state and 752 * simultaneously move all cards which don't have a 753 * CSN yet to Isolation state. 754 */ 755 pnp_write(PNP_WAKE, 0); 756 } 757 758 /* 759 * Unless we have chosen the wrong read port, all cards will 760 * be in Sleep state. Put them back into WaitForKey for 761 * now. Their resources will be programmed later. 762 */ 763 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY); 764 765 /* 766 * Cleanup. 767 */ 768 if (resources) 769 free(resources, M_TEMP); 770 771 return found; 772} 773 774 775/* 776 * pnp_identify() 777 * 778 * autoconfiguration of pnp devices. This routine just runs the 779 * isolation protocol over several ports, until one is successful. 780 * 781 * may be called more than once ? 782 * 783 */ 784 785static void 786pnp_identify(driver_t *driver, device_t parent) 787{ 788 int num_pnp_devs; 789 790#if 0 791 if (pnp_ldn_overrides[0].csn == 0) { 792 if (bootverbose) 793 printf("Initializing PnP override table\n"); 794 bzero (pnp_ldn_overrides, sizeof(pnp_ldn_overrides)); 795 pnp_ldn_overrides[0].csn = 255 ; 796 } 797#endif 798 799 /* Try various READ_DATA ports from 0x203-0x3ff */ 800 for (pnp_rd_port = 0x80; (pnp_rd_port < 0xff); pnp_rd_port += 0x10) { 801 if (bootverbose) 802 printf("Trying Read_Port at %x\n", (pnp_rd_port << 2) | 0x3); 803 804 num_pnp_devs = pnp_isolation_protocol(parent); 805 if (num_pnp_devs) 806 break; 807 } 808} 809 810static device_method_t pnp_methods[] = { 811 /* Device interface */ 812 DEVMETHOD(device_identify, pnp_identify), 813 814 { 0, 0 } 815}; 816 817static driver_t pnp_driver = { 818 "pnp", 819 pnp_methods, 820 1, /* no softc */ 821}; 822 823static devclass_t pnp_devclass; 824 825DRIVER_MODULE(pnp, isa, pnp_driver, pnp_devclass, 0, 0); 826