pnp.c revision 52241
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 52241 1999-10-14 21:03:03Z dfr $ 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/clock.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 int arg1; 58 int arg2; 59}; 60 61struct pnp_quirk pnp_quirks[] = { 62 /* 63 * The Gravis UltraSound needs register 0xf2 to be set to 0xff 64 * to enable power. 65 * XXX need to know the logical device id. 66 */ 67 { 0x0100561e /* GRV0001 */, 0, 68 PNP_QUIRK_WRITE_REG, 0xf2, 0xff }, 69 70 { 0 } 71}; 72 73#if 0 74/* 75 * these entries are initialized using the autoconfig menu 76 * The struct is invalid (and must be initialized) if the first 77 * CSN is zero. The init code fills invalid entries with CSN 255 78 * which is not a supported value. 79 */ 80 81struct pnp_cinfo pnp_ldn_overrides[MAX_PNP_LDN] = { 82 { 0 } 83}; 84#endif 85 86/* The READ_DATA port that we are using currently */ 87static int pnp_rd_port; 88 89static void pnp_send_initiation_key(void); 90static int pnp_get_serial(pnp_id *p); 91static int pnp_isolation_protocol(device_t parent); 92 93char * 94pnp_eisaformat(u_int32_t id) 95{ 96 u_int8_t *data = (u_int8_t *) &id; 97 static char idbuf[8]; 98 const char hextoascii[] = "0123456789abcdef"; 99 100 idbuf[0] = '@' + ((data[0] & 0x7c) >> 2); 101 idbuf[1] = '@' + (((data[0] & 0x3) << 3) + ((data[1] & 0xe0) >> 5)); 102 idbuf[2] = '@' + (data[1] & 0x1f); 103 idbuf[3] = hextoascii[(data[2] >> 4)]; 104 idbuf[4] = hextoascii[(data[2] & 0xf)]; 105 idbuf[5] = hextoascii[(data[3] >> 4)]; 106 idbuf[6] = hextoascii[(data[3] & 0xf)]; 107 idbuf[7] = 0; 108 return(idbuf); 109} 110 111static void 112pnp_write(int d, u_char r) 113{ 114 outb (_PNP_ADDRESS, d); 115 outb (_PNP_WRITE_DATA, r); 116} 117 118#if 0 119 120static u_char 121pnp_read(int d) 122{ 123 outb (_PNP_ADDRESS, d); 124 return (inb(3 | (pnp_rd_port <<2))); 125} 126 127#endif 128 129/* 130 * Send Initiation LFSR as described in "Plug and Play ISA Specification", 131 * Intel May 94. 132 */ 133static void 134pnp_send_initiation_key() 135{ 136 int cur, i; 137 138 /* Reset the LSFR */ 139 outb(_PNP_ADDRESS, 0); 140 outb(_PNP_ADDRESS, 0); /* yes, we do need it twice! */ 141 142 cur = 0x6a; 143 outb(_PNP_ADDRESS, cur); 144 145 for (i = 1; i < 32; i++) { 146 cur = (cur >> 1) | (((cur ^ (cur >> 1)) << 7) & 0xff); 147 outb(_PNP_ADDRESS, cur); 148 } 149} 150 151 152/* 153 * Get the device's serial number. Returns 1 if the serial is valid. 154 */ 155static int 156pnp_get_serial(pnp_id *p) 157{ 158 int i, bit, valid = 0, sum = 0x6a; 159 u_char *data = (u_char *)p; 160 161 bzero(data, sizeof(char) * 9); 162 outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION); 163 for (i = 0; i < 72; i++) { 164 bit = inb((pnp_rd_port << 2) | 0x3) == 0x55; 165 DELAY(250); /* Delay 250 usec */ 166 167 /* Can't Short Circuit the next evaluation, so 'and' is last */ 168 bit = (inb((pnp_rd_port << 2) | 0x3) == 0xaa) && bit; 169 DELAY(250); /* Delay 250 usec */ 170 171 valid = valid || bit; 172 173 if (i < 64) 174 sum = (sum >> 1) | 175 (((sum ^ (sum >> 1) ^ bit) << 7) & 0xff); 176 177 data[i / 8] = (data[i / 8] >> 1) | (bit ? 0x80 : 0); 178 } 179 180 valid = valid && (data[8] == sum); 181 182 return valid; 183} 184 185/* 186 * Fill's the buffer with resource info from the device. 187 * Returns the number of characters read. 188 */ 189static int 190pnp_get_resource_info(u_char *buffer, int len) 191{ 192 int i, j, count; 193 u_char temp; 194 195 count = 0; 196 for (i = 0; i < len; i++) { 197 outb(_PNP_ADDRESS, PNP_STATUS); 198 for (j = 0; j < 100; j++) { 199 if ((inb((pnp_rd_port << 2) | 0x3)) & 0x1) 200 break; 201 DELAY(1); 202 } 203 if (j == 100) { 204 printf("PnP device failed to report resource data\n"); 205 return count; 206 } 207 outb(_PNP_ADDRESS, PNP_RESOURCE_DATA); 208 temp = inb((pnp_rd_port << 2) | 0x3); 209 if (buffer != NULL) 210 buffer[i] = temp; 211 count++; 212 } 213 return count; 214} 215 216#if 0 217/* 218 * write_pnp_parms initializes a logical device with the parms 219 * in d, and then activates the board if the last parameter is 1. 220 */ 221 222static int 223write_pnp_parms(struct pnp_cinfo *d, pnp_id *p, int ldn) 224{ 225 int i, empty = -1 ; 226 227 pnp_write (SET_LDN, ldn ); 228 i = pnp_read(SET_LDN) ; 229 if (i != ldn) { 230 printf("Warning: LDN %d does not exist\n", ldn); 231 } 232 for (i = 0; i < 8; i++) { 233 pnp_write(IO_CONFIG_BASE + i * 2, d->ic_port[i] >> 8 ); 234 pnp_write(IO_CONFIG_BASE + i * 2 + 1, d->ic_port[i] & 0xff ); 235 } 236 for (i = 0; i < 4; i++) { 237 pnp_write(MEM_CONFIG + i*8, (d->ic_mem[i].base >> 16) & 0xff ); 238 pnp_write(MEM_CONFIG + i*8+1, (d->ic_mem[i].base >> 8) & 0xff ); 239 pnp_write(MEM_CONFIG + i*8+2, d->ic_mem[i].control & 0xff ); 240 pnp_write(MEM_CONFIG + i*8+3, (d->ic_mem[i].range >> 16) & 0xff ); 241 pnp_write(MEM_CONFIG + i*8+4, (d->ic_mem[i].range >> 8) & 0xff ); 242 } 243 for (i = 0; i < 2; i++) { 244 pnp_write(IRQ_CONFIG + i*2 , d->irq[i] ); 245 pnp_write(IRQ_CONFIG + i*2 + 1, d->irq_type[i] ); 246 pnp_write(DRQ_CONFIG + i, d->drq[i] ); 247 } 248 /* 249 * store parameters read into the current kernel 250 * so manual editing next time is easier 251 */ 252 for (i = 0 ; i < MAX_PNP_LDN; i++) { 253 if (pnp_ldn_overrides[i].csn == d->csn && 254 pnp_ldn_overrides[i].ldn == ldn) { 255 d->flags = pnp_ldn_overrides[i].flags ; 256 pnp_ldn_overrides[i] = *d ; 257 break ; 258 } else if (pnp_ldn_overrides[i].csn < 1 || 259 pnp_ldn_overrides[i].csn == 255) 260 empty = i ; 261 } 262 if (i== MAX_PNP_LDN && empty != -1) 263 pnp_ldn_overrides[empty] = *d; 264 265 /* 266 * Here should really perform the range check, and 267 * return a failure if not successful. 268 */ 269 pnp_write (IO_RANGE_CHECK, 0); 270 DELAY(1000); /* XXX is it really necessary ? */ 271 pnp_write (ACTIVATE, d->enable ? 1 : 0); 272 DELAY(1000); /* XXX is it really necessary ? */ 273 return 1 ; 274} 275#endif 276 277/* 278 * This function is called after the bus has assigned resource 279 * locations for a logical device. 280 */ 281static void 282pnp_set_config(void *arg, struct isa_config *config, int enable) 283{ 284 int csn = ((struct pnp_set_config_arg *) arg)->csn; 285 int ldn = ((struct pnp_set_config_arg *) arg)->ldn; 286 int i; 287 288 /* 289 * First put all cards into Sleep state with the initiation 290 * key, then put our card into Config state. 291 */ 292 pnp_send_initiation_key(); 293 pnp_write(PNP_WAKE, csn); 294 295 /* 296 * Select our logical device so that we can program it. 297 */ 298 pnp_write(PNP_SET_LDN, ldn); 299 300 /* 301 * Now program the resources. 302 */ 303 for (i = 0; i < config->ic_nmem; i++) { 304 u_int32_t start = config->ic_mem[i].ir_start; 305 u_int32_t size = config->ic_mem[i].ir_size; 306 if (start & 0xff) 307 panic("pnp_set_config: bogus memory assignment"); 308 pnp_write(PNP_MEM_BASE_HIGH(i), (start >> 16) & 0xff); 309 pnp_write(PNP_MEM_BASE_LOW(i), (start >> 8) & 0xff); 310 pnp_write(PNP_MEM_RANGE_HIGH(i), (size >> 16) & 0xff); 311 pnp_write(PNP_MEM_RANGE_LOW(i), (size >> 8) & 0xff); 312 } 313 for (; i < ISA_NMEM; i++) { 314 pnp_write(PNP_MEM_BASE_HIGH(i), 0); 315 pnp_write(PNP_MEM_BASE_LOW(i), 0); 316 pnp_write(PNP_MEM_RANGE_HIGH(i), 0); 317 pnp_write(PNP_MEM_RANGE_LOW(i), 0); 318 } 319 320 for (i = 0; i < config->ic_nport; i++) { 321 u_int32_t start = config->ic_port[i].ir_start; 322 pnp_write(PNP_IO_BASE_HIGH(i), (start >> 8) & 0xff); 323 pnp_write(PNP_IO_BASE_LOW(i), (start >> 0) & 0xff); 324 } 325 for (; i < ISA_NPORT; i++) { 326 pnp_write(PNP_IO_BASE_HIGH(i), 0); 327 pnp_write(PNP_IO_BASE_LOW(i), 0); 328 } 329 330 for (i = 0; i < config->ic_nirq; i++) { 331 int irq = ffs(config->ic_irqmask[i]) - 1; 332 pnp_write(PNP_IRQ_LEVEL(i), irq); 333 pnp_write(PNP_IRQ_TYPE(i), 2); /* XXX */ 334 } 335 for (; i < ISA_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 } 342 343 for (i = 0; i < config->ic_ndrq; i++) { 344 int drq = ffs(config->ic_drqmask[i]) - 1; 345 pnp_write(PNP_DMA_CHANNEL(i), drq); 346 } 347 for (; i < ISA_NDRQ; i++) { 348 /* 349 * DMA channel 4, the cascade channel is used to 350 * indicate no DMA channel is active. 351 */ 352 pnp_write(PNP_DMA_CHANNEL(i), 4); 353 } 354 355 pnp_write(PNP_ACTIVATE, enable ? 1 : 0); 356 357 /* 358 * Wake everyone up again, we are finished. 359 */ 360 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY); 361} 362 363/* 364 * Process quirks for a logical device.. The card must be in Config state. 365 */ 366static void 367pnp_check_quirks(u_int32_t vendor_id, u_int32_t logical_id, int ldn) 368{ 369 struct pnp_quirk *qp; 370 371 for (qp = &pnp_quirks[0]; qp->vendor_id; qp++) { 372 if (qp->vendor_id == vendor_id 373 && (qp->logical_id == 0 374 || qp->logical_id == logical_id)) { 375 switch (qp->type) { 376 case PNP_QUIRK_WRITE_REG: 377 pnp_write(PNP_SET_LDN, ldn); 378 pnp_write(qp->arg1, qp->arg2); 379 break; 380 } 381 } 382 } 383} 384 385/* 386 * Scan Resource Data for Logical Devices. 387 * 388 * This function exits as soon as it gets an error reading *ANY* 389 * Resource Data or it reaches the end of Resource Data. In the first 390 * case the return value will be TRUE, FALSE otherwise. 391 */ 392static int 393pnp_create_devices(device_t parent, pnp_id *p, int csn, 394 u_char *resources, int len) 395{ 396 u_char tag, *resp, *resinfo, *startres = 0; 397 int large_len, scanning = len, retval = FALSE; 398 u_int32_t logical_id; 399 u_int32_t compat_id; 400 device_t dev = 0; 401 int ldn = 0; 402 struct pnp_set_config_arg *csnldn; 403 char buf[100]; 404 char *desc = 0; 405 406 resp = resources; 407 while (scanning > 0) { 408 tag = *resp++; 409 scanning--; 410 if (PNP_RES_TYPE(tag) != 0) { 411 /* Large resource */ 412 if (scanning < 2) { 413 scanning = 0; 414 continue; 415 } 416 large_len = resp[0] + (resp[1] << 8); 417 resp += 2; 418 419 if (scanning < large_len) { 420 scanning = 0; 421 continue; 422 } 423 resinfo = resp; 424 resp += large_len; 425 scanning -= large_len; 426 427 if (PNP_LRES_NUM(tag) == PNP_TAG_ID_ANSI) { 428 if (large_len > sizeof(buf) - 1) 429 large_len = sizeof(buf) - 1; 430 bcopy(resinfo, buf, large_len); 431 432 /* 433 * Trim trailing spaces. 434 */ 435 while (buf[large_len-1] == ' ') 436 large_len--; 437 buf[large_len] = '\0'; 438 desc = buf; 439 if (dev) 440 device_set_desc_copy(dev, desc); 441 continue; 442 } 443 444 continue; 445 } 446 447 /* Small resource */ 448 if (scanning < PNP_SRES_LEN(tag)) { 449 scanning = 0; 450 continue; 451 } 452 resinfo = resp; 453 resp += PNP_SRES_LEN(tag); 454 scanning -= PNP_SRES_LEN(tag);; 455 456 switch (PNP_SRES_NUM(tag)) { 457 case PNP_TAG_LOGICAL_DEVICE: 458 /* 459 * Parse the resources for the previous 460 * logical device (if any). 461 */ 462 if (startres) { 463 pnp_parse_resources(dev, startres, 464 resinfo - startres - 1); 465 dev = 0; 466 startres = 0; 467 } 468 469 /* 470 * A new logical device. Scan for end of 471 * resources. 472 */ 473 bcopy(resinfo, &logical_id, 4); 474 pnp_check_quirks(p->vendor_id, logical_id, ldn); 475 compat_id = 0; 476 dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNP, NULL, -1); 477 if (desc) 478 device_set_desc_copy(dev, desc); 479 isa_set_vendorid(dev, p->vendor_id); 480 isa_set_serial(dev, p->serial); 481 isa_set_logicalid(dev, logical_id); 482 csnldn = malloc(sizeof *csnldn, M_DEVBUF, M_NOWAIT); 483 if (!csnldn) { 484 device_printf(parent, 485 "out of memory\n"); 486 scanning = 0; 487 break; 488 } 489 csnldn->csn = csn; 490 csnldn->ldn = ldn; 491 ISA_SET_CONFIG_CALLBACK(parent, dev, 492 pnp_set_config, csnldn); 493 ldn++; 494 startres = resp; 495 break; 496 497 case PNP_TAG_END: 498 if (!startres) { 499 device_printf(parent, 500 "malformed resources\n"); 501 scanning = 0; 502 break; 503 } 504 pnp_parse_resources(dev, startres, 505 resinfo - startres - 1); 506 dev = 0; 507 startres = 0; 508 scanning = 0; 509 break; 510 511 default: 512 /* Skip this resource */ 513 break; 514 } 515 } 516 517 return retval; 518} 519 520/* 521 * Read 'amount' bytes of resources from the card, allocating memory 522 * as needed. If a buffer is already available, it should be passed in 523 * '*resourcesp' and its length in '*spacep'. The number of resource 524 * bytes already in the buffer should be passed in '*lenp'. The memory 525 * allocated will be returned in '*resourcesp' with its size and the 526 * number of bytes of resources in '*spacep' and '*lenp' respectively. 527 */ 528static int 529pnp_read_bytes(int amount, u_char **resourcesp, int *spacep, int *lenp) 530{ 531 u_char *resources = *resourcesp; 532 u_char *newres; 533 int space = *spacep; 534 int len = *lenp; 535 536 if (space == 0) { 537 space = 1024; 538 resources = malloc(space, M_TEMP, M_NOWAIT); 539 if (!resources) 540 return ENOMEM; 541 } 542 543 if (len + amount > space) { 544 int extra = 1024; 545 while (len + amount > space + extra) 546 extra += 1024; 547 newres = malloc(space + extra, M_TEMP, M_NOWAIT); 548 if (!newres) 549 return ENOMEM; 550 bcopy(resources, newres, len); 551 free(resources, M_TEMP); 552 resources = newres; 553 space += extra; 554 } 555 556 if (pnp_get_resource_info(resources + len, amount) != amount) 557 return EINVAL; 558 len += amount; 559 560 *resourcesp = resources; 561 *spacep = space; 562 *lenp = len; 563 564 return 0; 565} 566 567/* 568 * Read all resources from the card, allocating memory as needed. If a 569 * buffer is already available, it should be passed in '*resourcesp' 570 * and its length in '*spacep'. The memory allocated will be returned 571 * in '*resourcesp' with its size and the number of bytes of resources 572 * in '*spacep' and '*lenp' respectively. 573 */ 574static int 575pnp_read_resources(u_char **resourcesp, int *spacep, int *lenp) 576{ 577 u_char *resources = *resourcesp; 578 int space = *spacep; 579 int len = 0; 580 int error, done; 581 u_char tag; 582 583 error = 0; 584 done = 0; 585 while (!done) { 586 error = pnp_read_bytes(1, &resources, &space, &len); 587 if (error) 588 goto out; 589 tag = resources[len-1]; 590 if (PNP_RES_TYPE(tag) == 0) { 591 /* 592 * Small resource, read contents. 593 */ 594 error = pnp_read_bytes(PNP_SRES_LEN(tag), 595 &resources, &space, &len); 596 if (error) 597 goto out; 598 if (PNP_SRES_NUM(tag) == PNP_TAG_END) 599 done = 1; 600 } else { 601 /* 602 * Large resource, read length and contents. 603 */ 604 error = pnp_read_bytes(2, &resources, &space, &len); 605 if (error) 606 goto out; 607 error = pnp_read_bytes(resources[len-2] 608 + (resources[len-1] << 8), 609 &resources, &space, &len); 610 if (error) 611 goto out; 612 } 613 } 614 615 out: 616 *resourcesp = resources; 617 *spacep = space; 618 *lenp = len; 619 return error; 620} 621 622/* 623 * Run the isolation protocol. Use pnp_rd_port as the READ_DATA port 624 * value (caller should try multiple READ_DATA locations before giving 625 * up). Upon exiting, all cards are aware that they should use 626 * pnp_rd_port as the READ_DATA port. 627 * 628 * In the first pass, a csn is assigned to each board and pnp_id's 629 * are saved to an array, pnp_devices. In the second pass, each 630 * card is woken up and the device configuration is called. 631 */ 632static int 633pnp_isolation_protocol(device_t parent) 634{ 635 int csn; 636 pnp_id id; 637 int found = 0, len; 638 u_char *resources = 0; 639 int space = 0; 640 int error; 641 642 /* 643 * Put all cards into the Sleep state so that we can clear 644 * their CSNs. 645 */ 646 pnp_send_initiation_key(); 647 648 /* 649 * Clear the CSN for all cards. 650 */ 651 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_RESET_CSN); 652 653 /* 654 * Move all cards to the Isolation state. 655 */ 656 pnp_write(PNP_WAKE, 0); 657 658 /* 659 * Tell them where the read point is going to be this time. 660 */ 661 pnp_write(PNP_SET_RD_DATA, pnp_rd_port); 662 663 for (csn = 1; csn < PNP_MAX_CARDS; csn++) { 664 /* 665 * Start the serial isolation protocol. 666 */ 667 outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION); 668 DELAY(1000); /* Delay 1 msec */ 669 670 if (pnp_get_serial(&id)) { 671 /* 672 * We have read the id from a card 673 * successfully. The card which won the 674 * isolation protocol will be in Isolation 675 * mode and all others will be in Sleep. 676 * Program the CSN of the isolated card 677 * (taking it to Config state) and read its 678 * resources, creating devices as we find 679 * logical devices on the card. 680 */ 681 pnp_write(PNP_SET_CSN, csn); 682 error = pnp_read_resources(&resources, 683 &space, 684 &len); 685 if (error) 686 break; 687 pnp_create_devices(parent, &id, csn, 688 resources, len); 689 found++; 690 } else 691 break; 692 693 /* 694 * Put this card back to the Sleep state and 695 * simultaneously move all cards which don't have a 696 * CSN yet to Isolation state. 697 */ 698 pnp_write(PNP_WAKE, 0); 699 } 700 701 /* 702 * Unless we have chosen the wrong read port, all cards will 703 * be in Sleep state. Put them back into WaitForKey for 704 * now. Their resources will be programmed later. 705 */ 706 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY); 707 708 /* 709 * Cleanup. 710 */ 711 if (resources) 712 free(resources, M_TEMP); 713 714 return found; 715} 716 717 718/* 719 * pnp_identify() 720 * 721 * autoconfiguration of pnp devices. This routine just runs the 722 * isolation protocol over several ports, until one is successful. 723 * 724 * may be called more than once ? 725 * 726 */ 727 728static void 729pnp_identify(driver_t *driver, device_t parent) 730{ 731 int num_pnp_devs; 732 733#if 0 734 if (pnp_ldn_overrides[0].csn == 0) { 735 if (bootverbose) 736 printf("Initializing PnP override table\n"); 737 bzero (pnp_ldn_overrides, sizeof(pnp_ldn_overrides)); 738 pnp_ldn_overrides[0].csn = 255 ; 739 } 740#endif 741 742 /* Try various READ_DATA ports from 0x203-0x3ff */ 743 for (pnp_rd_port = 0x80; (pnp_rd_port < 0xff); pnp_rd_port += 0x10) { 744 if (bootverbose) 745 printf("Trying Read_Port at %x\n", (pnp_rd_port << 2) | 0x3); 746 747 num_pnp_devs = pnp_isolation_protocol(parent); 748 if (num_pnp_devs) 749 break; 750 } 751} 752 753static device_method_t pnp_methods[] = { 754 /* Device interface */ 755 DEVMETHOD(device_identify, pnp_identify), 756 757 { 0, 0 } 758}; 759 760static driver_t pnp_driver = { 761 "pnp", 762 pnp_methods, 763 1, /* no softc */ 764}; 765 766static devclass_t pnp_devclass; 767 768DRIVER_MODULE(pnp, isa, pnp_driver, pnp_devclass, 0, 0); 769