Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/isa/pnp.c
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1 /* 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1996, Sujal M. Patel 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * from: pnp.c,v 1.11 1999/05/06 22:11:19 peter Exp 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/module.h> 38 #include <sys/bus.h> 39 #include <sys/endian.h> 40 #include <sys/malloc.h> 41 #include <isa/isavar.h> 42 #include <isa/pnpreg.h> 43 #include <isa/pnpvar.h> 44 #include <machine/bus.h> 45 46 typedef struct _pnp_id { 47 uint32_t vendor_id; 48 uint32_t serial; 49 u_char checksum; 50 } pnp_id; 51 52 struct pnp_set_config_arg { 53 int csn; /* Card number to configure */ 54 int ldn; /* Logical device on card */ 55 }; 56 57 struct pnp_quirk { 58 uint32_t vendor_id; /* Vendor of the card */ 59 uint32_t logical_id; /* ID of the device with quirk */ 60 int type; 61 #define PNP_QUIRK_WRITE_REG 1 /* Need to write a pnp register */ 62 #define PNP_QUIRK_EXTRA_IO 2 /* Has extra io ports */ 63 int arg1; 64 int arg2; 65 }; 66 67 struct pnp_quirk pnp_quirks[] = { 68 /* 69 * The Gravis UltraSound needs register 0xf2 to be set to 0xff 70 * to enable power. 71 * XXX need to know the logical device id. 72 */ 73 { 0x0100561e /* GRV0001 */, 0, 74 PNP_QUIRK_WRITE_REG, 0xf2, 0xff }, 75 /* 76 * An emu8000 does not give us other than the first 77 * port. 78 */ 79 { 0x26008c0e /* SB16 */, 0x21008c0e, 80 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 81 { 0x42008c0e /* SB32(CTL0042) */, 0x21008c0e, 82 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 83 { 0x44008c0e /* SB32(CTL0044) */, 0x21008c0e, 84 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 85 { 0x49008c0e /* SB32(CTL0049) */, 0x21008c0e, 86 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 87 { 0xf1008c0e /* SB32(CTL00f1) */, 0x21008c0e, 88 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 89 { 0xc1008c0e /* SB64(CTL00c1) */, 0x22008c0e, 90 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 91 { 0xc5008c0e /* SB64(CTL00c5) */, 0x22008c0e, 92 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 93 { 0xe4008c0e /* SB64(CTL00e4) */, 0x22008c0e, 94 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 95 96 { 0 } 97 }; 98 99 /* The READ_DATA port that we are using currently */ 100 static int pnp_rd_port; 101 102 static void pnp_send_initiation_key(void); 103 static int pnp_get_serial(pnp_id *p); 104 static int pnp_isolation_protocol(device_t parent); 105 106 static void 107 pnp_write(int d, u_char r) 108 { 109 outb (_PNP_ADDRESS, d); 110 outb (_PNP_WRITE_DATA, r); 111 } 112 113 /* 114 * Send Initiation LFSR as described in "Plug and Play ISA Specification", 115 * Intel May 94. 116 */ 117 static void 118 pnp_send_initiation_key(void) 119 { 120 int cur, i; 121 122 /* Reset the LSFR */ 123 outb(_PNP_ADDRESS, 0); 124 outb(_PNP_ADDRESS, 0); /* yes, we do need it twice! */ 125 126 cur = 0x6a; 127 outb(_PNP_ADDRESS, cur); 128 129 for (i = 1; i < 32; i++) { 130 cur = (cur >> 1) | (((cur ^ (cur >> 1)) << 7) & 0xff); 131 outb(_PNP_ADDRESS, cur); 132 } 133 } 134 135 136 /* 137 * Get the device's serial number. Returns 1 if the serial is valid. 138 */ 139 static int 140 pnp_get_serial(pnp_id *p) 141 { 142 int i, bit, valid = 0, sum = 0x6a; 143 u_char *data = (u_char *)p; 144 145 bzero(data, sizeof(char) * 9); 146 outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION); 147 for (i = 0; i < 72; i++) { 148 bit = inb((pnp_rd_port << 2) | 0x3) == 0x55; 149 DELAY(250); /* Delay 250 usec */ 150 151 /* Can't Short Circuit the next evaluation, so 'and' is last */ 152 bit = (inb((pnp_rd_port << 2) | 0x3) == 0xaa) && bit; 153 DELAY(250); /* Delay 250 usec */ 154 155 valid = valid || bit; 156 if (i < 64) 157 sum = (sum >> 1) | 158 (((sum ^ (sum >> 1) ^ bit) << 7) & 0xff); 159 data[i / 8] = (data[i / 8] >> 1) | (bit ? 0x80 : 0); 160 } 161 162 valid = valid && (data[8] == sum); 163 164 return (valid); 165 } 166 167 /* 168 * Fill's the buffer with resource info from the device. 169 * Returns the number of characters read. 170 */ 171 static int 172 pnp_get_resource_info(u_char *buffer, int len) 173 { 174 int i, j, count; 175 u_char temp; 176 177 count = 0; 178 for (i = 0; i < len; i++) { 179 outb(_PNP_ADDRESS, PNP_STATUS); 180 for (j = 0; j < 100; j++) { 181 if ((inb((pnp_rd_port << 2) | 0x3)) & 0x1) 182 break; 183 DELAY(10); 184 } 185 if (j == 100) { 186 printf("PnP device failed to report resource data\n"); 187 return (count); 188 } 189 outb(_PNP_ADDRESS, PNP_RESOURCE_DATA); 190 temp = inb((pnp_rd_port << 2) | 0x3); 191 if (buffer != NULL) 192 buffer[i] = temp; 193 count++; 194 } 195 return (count); 196 } 197 198 /* 199 * This function is called after the bus has assigned resource 200 * locations for a logical device. 201 */ 202 static void 203 pnp_set_config(void *arg, struct isa_config *config, int enable) 204 { 205 int csn = ((struct pnp_set_config_arg *) arg)->csn; 206 int ldn = ((struct pnp_set_config_arg *) arg)->ldn; 207 int i; 208 209 /* 210 * First put all cards into Sleep state with the initiation 211 * key, then put our card into Config state. 212 */ 213 pnp_send_initiation_key(); 214 pnp_write(PNP_WAKE, csn); 215 216 /* 217 * Select our logical device so that we can program it. 218 */ 219 pnp_write(PNP_SET_LDN, ldn); 220 221 /* 222 * Constrain the number of resources we will try to program 223 */ 224 if (config->ic_nmem > ISA_PNP_NMEM) { 225 printf("too many ISA memory ranges (%d > %d)\n", 226 config->ic_nmem, ISA_PNP_NMEM); 227 config->ic_nmem = ISA_PNP_NMEM; 228 } 229 if (config->ic_nport > ISA_PNP_NPORT) { 230 printf("too many ISA I/O ranges (%d > %d)\n", config->ic_nport, 231 ISA_PNP_NPORT); 232 config->ic_nport = ISA_PNP_NPORT; 233 } 234 if (config->ic_nirq > ISA_PNP_NIRQ) { 235 printf("too many ISA IRQs (%d > %d)\n", config->ic_nirq, 236 ISA_PNP_NIRQ); 237 config->ic_nirq = ISA_PNP_NIRQ; 238 } 239 if (config->ic_ndrq > ISA_PNP_NDRQ) { 240 printf("too many ISA DRQs (%d > %d)\n", config->ic_ndrq, 241 ISA_PNP_NDRQ); 242 config->ic_ndrq = ISA_PNP_NDRQ; 243 } 244 245 /* 246 * Now program the resources. 247 */ 248 for (i = 0; i < config->ic_nmem; i++) { 249 uint32_t start; 250 uint32_t size; 251 252 /* XXX: should handle memory control register, 32 bit memory */ 253 if (config->ic_mem[i].ir_size == 0) { 254 pnp_write(PNP_MEM_BASE_HIGH(i), 0); 255 pnp_write(PNP_MEM_BASE_LOW(i), 0); 256 pnp_write(PNP_MEM_RANGE_HIGH(i), 0); 257 pnp_write(PNP_MEM_RANGE_LOW(i), 0); 258 } else { 259 start = config->ic_mem[i].ir_start; 260 size = config->ic_mem[i].ir_size; 261 if (start & 0xff) 262 panic("pnp_set_config: bogus memory assignment"); 263 pnp_write(PNP_MEM_BASE_HIGH(i), (start >> 16) & 0xff); 264 pnp_write(PNP_MEM_BASE_LOW(i), (start >> 8) & 0xff); 265 pnp_write(PNP_MEM_RANGE_HIGH(i), (size >> 16) & 0xff); 266 pnp_write(PNP_MEM_RANGE_LOW(i), (size >> 8) & 0xff); 267 } 268 } 269 for (; i < ISA_PNP_NMEM; i++) { 270 pnp_write(PNP_MEM_BASE_HIGH(i), 0); 271 pnp_write(PNP_MEM_BASE_LOW(i), 0); 272 pnp_write(PNP_MEM_RANGE_HIGH(i), 0); 273 pnp_write(PNP_MEM_RANGE_LOW(i), 0); 274 } 275 276 for (i = 0; i < config->ic_nport; i++) { 277 uint32_t start; 278 279 if (config->ic_port[i].ir_size == 0) { 280 pnp_write(PNP_IO_BASE_HIGH(i), 0); 281 pnp_write(PNP_IO_BASE_LOW(i), 0); 282 } else { 283 start = config->ic_port[i].ir_start; 284 pnp_write(PNP_IO_BASE_HIGH(i), (start >> 8) & 0xff); 285 pnp_write(PNP_IO_BASE_LOW(i), (start >> 0) & 0xff); 286 } 287 } 288 for (; i < ISA_PNP_NPORT; i++) { 289 pnp_write(PNP_IO_BASE_HIGH(i), 0); 290 pnp_write(PNP_IO_BASE_LOW(i), 0); 291 } 292 293 for (i = 0; i < config->ic_nirq; i++) { 294 int irq; 295 296 /* XXX: interrupt type */ 297 if (config->ic_irqmask[i] == 0) { 298 pnp_write(PNP_IRQ_LEVEL(i), 0); 299 pnp_write(PNP_IRQ_TYPE(i), 2); 300 } else { 301 irq = ffs(config->ic_irqmask[i]) - 1; 302 pnp_write(PNP_IRQ_LEVEL(i), irq); 303 pnp_write(PNP_IRQ_TYPE(i), 2); /* XXX */ 304 } 305 } 306 for (; i < ISA_PNP_NIRQ; i++) { 307 /* 308 * IRQ 0 is not a valid interrupt selection and 309 * represents no interrupt selection. 310 */ 311 pnp_write(PNP_IRQ_LEVEL(i), 0); 312 pnp_write(PNP_IRQ_TYPE(i), 2); 313 } 314 315 for (i = 0; i < config->ic_ndrq; i++) { 316 int drq; 317 318 if (config->ic_drqmask[i] == 0) { 319 pnp_write(PNP_DMA_CHANNEL(i), 4); 320 } else { 321 drq = ffs(config->ic_drqmask[i]) - 1; 322 pnp_write(PNP_DMA_CHANNEL(i), drq); 323 } 324 } 325 for (; i < ISA_PNP_NDRQ; i++) { 326 /* 327 * DMA channel 4, the cascade channel is used to 328 * indicate no DMA channel is active. 329 */ 330 pnp_write(PNP_DMA_CHANNEL(i), 4); 331 } 332 333 pnp_write(PNP_ACTIVATE, enable ? 1 : 0); 334 335 /* 336 * Wake everyone up again, we are finished. 337 */ 338 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY); 339 } 340 341 /* 342 * Process quirks for a logical device.. The card must be in Config state. 343 */ 344 void 345 pnp_check_quirks(uint32_t vendor_id, uint32_t logical_id, int ldn, 346 struct isa_config *config) 347 { 348 struct pnp_quirk *qp; 349 350 for (qp = &pnp_quirks[0]; qp->vendor_id; qp++) { 351 if (qp->vendor_id == vendor_id 352 && (qp->logical_id == 0 || qp->logical_id == logical_id)) { 353 switch (qp->type) { 354 case PNP_QUIRK_WRITE_REG: 355 pnp_write(PNP_SET_LDN, ldn); 356 pnp_write(qp->arg1, qp->arg2); 357 break; 358 case PNP_QUIRK_EXTRA_IO: 359 if (config == NULL) 360 break; 361 if (qp->arg1 != 0) { 362 config->ic_nport++; 363 config->ic_port[config->ic_nport - 1] = config->ic_port[0]; 364 config->ic_port[config->ic_nport - 1].ir_start += qp->arg1; 365 config->ic_port[config->ic_nport - 1].ir_end += qp->arg1; 366 } 367 if (qp->arg2 != 0) { 368 config->ic_nport++; 369 config->ic_port[config->ic_nport - 1] = config->ic_port[0]; 370 config->ic_port[config->ic_nport - 1].ir_start += qp->arg2; 371 config->ic_port[config->ic_nport - 1].ir_end += qp->arg2; 372 } 373 break; 374 } 375 } 376 } 377 } 378 379 /* 380 * Scan Resource Data for Logical Devices. 381 * 382 * This function exits as soon as it gets an error reading *ANY* 383 * Resource Data or it reaches the end of Resource Data. In the first 384 * case the return value will be TRUE, FALSE otherwise. 385 */ 386 static int 387 pnp_create_devices(device_t parent, pnp_id *p, int csn, 388 u_char *resources, int len) 389 { 390 u_char tag, *resp, *resinfo, *startres = NULL; 391 int large_len, scanning = len, retval = FALSE; 392 uint32_t logical_id; 393 device_t dev = 0; 394 int ldn = 0; 395 struct pnp_set_config_arg *csnldn; 396 char buf[100]; 397 char *desc = NULL; 398 399 resp = resources; 400 while (scanning > 0) { 401 tag = *resp++; 402 scanning--; 403 if (PNP_RES_TYPE(tag) != 0) { 404 /* Large resource */ 405 if (scanning < 2) { 406 scanning = 0; 407 continue; 408 } 409 large_len = resp[0] + (resp[1] << 8); 410 resp += 2; 411 412 if (scanning < large_len) { 413 scanning = 0; 414 continue; 415 } 416 resinfo = resp; 417 resp += large_len; 418 scanning -= large_len; 419 420 if (PNP_LRES_NUM(tag) == PNP_TAG_ID_ANSI) { 421 if (dev) { 422 /* 423 * This is an optional device 424 * identifier string. Skip it 425 * for now. 426 */ 427 continue; 428 } 429 /* else mandately card identifier string */ 430 if (large_len > sizeof(buf) - 1) 431 large_len = sizeof(buf) - 1; 432 bcopy(resinfo, buf, large_len); 433 434 /* 435 * Trim trailing spaces. 436 */ 437 while (buf[large_len-1] == ' ') 438 large_len--; 439 buf[large_len] = '\0'; 440 desc = buf; 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, ldn); 465 dev = 0; 466 startres = NULL; 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, NULL); 475 dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNP, NULL, -1); 476 if (desc) 477 device_set_desc_copy(dev, desc); 478 else 479 device_set_desc_copy(dev, 480 pnp_eisaformat(logical_id)); 481 isa_set_vendorid(dev, p->vendor_id); 482 isa_set_serial(dev, p->serial); 483 isa_set_logicalid(dev, logical_id); 484 isa_set_configattr(dev, 485 ISACFGATTR_CANDISABLE | ISACFGATTR_DYNAMIC); 486 csnldn = malloc(sizeof *csnldn, M_DEVBUF, M_NOWAIT); 487 if (!csnldn) { 488 device_printf(parent, "out of memory\n"); 489 scanning = 0; 490 break; 491 } 492 csnldn->csn = csn; 493 csnldn->ldn = ldn; 494 ISA_SET_CONFIG_CALLBACK(parent, dev, pnp_set_config, 495 csnldn); 496 isa_set_pnp_csn(dev, csn); 497 isa_set_pnp_ldn(dev, ldn); 498 ldn++; 499 startres = resp; 500 break; 501 502 case PNP_TAG_END: 503 if (!startres) { 504 device_printf(parent, "malformed resources\n"); 505 scanning = 0; 506 break; 507 } 508 pnp_parse_resources(dev, startres, 509 resinfo - startres - 1, ldn); 510 dev = 0; 511 startres = NULL; 512 scanning = 0; 513 break; 514 515 default: 516 /* Skip this resource */ 517 break; 518 } 519 } 520 521 return (retval); 522 } 523 524 /* 525 * Read 'amount' bytes of resources from the card, allocating memory 526 * as needed. If a buffer is already available, it should be passed in 527 * '*resourcesp' and its length in '*spacep'. The number of resource 528 * bytes already in the buffer should be passed in '*lenp'. The memory 529 * allocated will be returned in '*resourcesp' with its size and the 530 * number of bytes of resources in '*spacep' and '*lenp' respectively. 531 * 532 * XXX: Multiple problems here, we forget to free() stuff in one 533 * XXX: error return, and in another case we free (*resourcesp) but 534 * XXX: don't tell the caller. 535 */ 536 static int 537 pnp_read_bytes(int amount, u_char **resourcesp, int *spacep, int *lenp) 538 { 539 u_char *resources = *resourcesp; 540 u_char *newres; 541 int space = *spacep; 542 int len = *lenp; 543 544 if (space == 0) { 545 space = 1024; 546 resources = malloc(space, M_TEMP, M_NOWAIT); 547 if (!resources) 548 return (ENOMEM); 549 } 550 551 if (len + amount > space) { 552 int extra = 1024; 553 while (len + amount > space + extra) 554 extra += 1024; 555 newres = malloc(space + extra, M_TEMP, M_NOWAIT); 556 if (!newres) { 557 /* XXX: free resources */ 558 return (ENOMEM); 559 } 560 bcopy(resources, newres, len); 561 free(resources, M_TEMP); 562 resources = newres; 563 space += extra; 564 } 565 566 if (pnp_get_resource_info(resources + len, amount) != amount) 567 return (EINVAL); 568 len += amount; 569 570 *resourcesp = resources; 571 *spacep = space; 572 *lenp = len; 573 574 return (0); 575 } 576 577 /* 578 * Read all resources from the card, allocating memory as needed. If a 579 * buffer is already available, it should be passed in '*resourcesp' 580 * and its length in '*spacep'. The memory allocated will be returned 581 * in '*resourcesp' with its size and the number of bytes of resources 582 * in '*spacep' and '*lenp' respectively. 583 */ 584 static int 585 pnp_read_resources(u_char **resourcesp, int *spacep, int *lenp) 586 { 587 u_char *resources = *resourcesp; 588 int space = *spacep; 589 int len = 0; 590 int error, done; 591 u_char tag; 592 593 error = 0; 594 done = 0; 595 while (!done) { 596 error = pnp_read_bytes(1, &resources, &space, &len); 597 if (error) 598 goto out; 599 tag = resources[len-1]; 600 if (PNP_RES_TYPE(tag) == 0) { 601 /* 602 * Small resource, read contents. 603 */ 604 error = pnp_read_bytes(PNP_SRES_LEN(tag), 605 &resources, &space, &len); 606 if (error) 607 goto out; 608 if (PNP_SRES_NUM(tag) == PNP_TAG_END) 609 done = 1; 610 } else { 611 /* 612 * Large resource, read length and contents. 613 */ 614 error = pnp_read_bytes(2, &resources, &space, &len); 615 if (error) 616 goto out; 617 error = pnp_read_bytes(resources[len-2] 618 + (resources[len-1] << 8), &resources, &space, 619 &len); 620 if (error) 621 goto out; 622 } 623 } 624 625 out: 626 *resourcesp = resources; 627 *spacep = space; 628 *lenp = len; 629 return (error); 630 } 631 632 /* 633 * Run the isolation protocol. Use pnp_rd_port as the READ_DATA port 634 * value (caller should try multiple READ_DATA locations before giving 635 * up). Upon exiting, all cards are aware that they should use 636 * pnp_rd_port as the READ_DATA port. 637 * 638 * In the first pass, a csn is assigned to each board and pnp_id's 639 * are saved to an array, pnp_devices. In the second pass, each 640 * card is woken up and the device configuration is called. 641 */ 642 static int 643 pnp_isolation_protocol(device_t parent) 644 { 645 int csn; 646 pnp_id id; 647 int found = 0, len; 648 u_char *resources = NULL; 649 int space = 0; 650 int error; 651 652 /* 653 * Put all cards into the Sleep state so that we can clear 654 * their CSNs. 655 */ 656 pnp_send_initiation_key(); 657 658 /* 659 * Clear the CSN for all cards. 660 */ 661 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_RESET_CSN); 662 663 /* 664 * Move all cards to the Isolation state. 665 */ 666 pnp_write(PNP_WAKE, 0); 667 668 /* 669 * Tell them where the read point is going to be this time. 670 */ 671 pnp_write(PNP_SET_RD_DATA, pnp_rd_port); 672 673 for (csn = 1; csn < PNP_MAX_CARDS; csn++) { 674 /* 675 * Start the serial isolation protocol. 676 */ 677 outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION); 678 DELAY(1000); /* Delay 1 msec */ 679 680 if (pnp_get_serial(&id)) { 681 /* 682 * We have read the id from a card 683 * successfully. The card which won the 684 * isolation protocol will be in Isolation 685 * mode and all others will be in Sleep. 686 * Program the CSN of the isolated card 687 * (taking it to Config state) and read its 688 * resources, creating devices as we find 689 * logical devices on the card. 690 */ 691 pnp_write(PNP_SET_CSN, csn); 692 if (bootverbose) 693 printf("Reading PnP configuration for %s.\n", 694 pnp_eisaformat(id.vendor_id)); 695 error = pnp_read_resources(&resources, &space, &len); 696 if (error) 697 break; 698 pnp_create_devices(parent, &id, csn, resources, len); 699 found++; 700 } else 701 break; 702 703 /* 704 * Put this card back to the Sleep state and 705 * simultaneously move all cards which don't have a 706 * CSN yet to Isolation state. 707 */ 708 pnp_write(PNP_WAKE, 0); 709 } 710 711 /* 712 * Unless we have chosen the wrong read port, all cards will 713 * be in Sleep state. Put them back into WaitForKey for 714 * now. Their resources will be programmed later. 715 */ 716 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY); 717 718 /* 719 * Cleanup. 720 */ 721 if (resources) 722 free(resources, M_TEMP); 723 724 return (found); 725 } 726 727 728 /* 729 * pnp_identify() 730 * 731 * autoconfiguration of pnp devices. This routine just runs the 732 * isolation protocol over several ports, until one is successful. 733 * 734 * may be called more than once ? 735 * 736 */ 737 738 static void 739 pnp_identify(driver_t *driver, device_t parent) 740 { 741 int num_pnp_devs; 742 743 /* Try various READ_DATA ports from 0x203-0x3ff */ 744 for (pnp_rd_port = 0x80; (pnp_rd_port < 0xff); pnp_rd_port += 0x10) { 745 if (bootverbose) 746 printf("pnp_identify: Trying Read_Port at %x\n", 747 (pnp_rd_port << 2) | 0x3); 748 749 num_pnp_devs = pnp_isolation_protocol(parent); 750 if (num_pnp_devs) 751 break; 752 } 753 if (bootverbose) 754 printf("PNP Identify complete\n"); 755 } 756 757 static device_method_t pnp_methods[] = { 758 /* Device interface */ 759 DEVMETHOD(device_identify, pnp_identify), 760 761 { 0, 0 } 762 }; 763 764 static driver_t pnp_driver = { 765 "pnp", 766 pnp_methods, 767 1, /* no softc */ 768 }; 769 770 static devclass_t pnp_devclass; 771 772 DRIVER_MODULE(pnp, isa, pnp_driver, pnp_devclass, 0, 0);
Cache object: cc00f850dcf80018f55a4a4797ac1d1f
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