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: src/sys/isa/pnp.c,v 1.5.2.1 2002/10/14 09:31:09 nyan Exp $ 27 * $DragonFly: src/sys/bus/isa/pnp.c,v 1.6 2005/06/12 20:55:14 swildner Exp $ 28 * from: pnp.c,v 1.11 1999/05/06 22:11:19 peter Exp 29 */ 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/kernel.h> 34 #include <sys/module.h> 35 #include <sys/bus.h> 36 #include <sys/malloc.h> 37 #include "isavar.h" 38 #include "pnpreg.h" 39 #include "pnpvar.h" 40 #include <machine/clock.h> 41 42 typedef struct _pnp_id { 43 u_int32_t vendor_id; 44 u_int32_t serial; 45 u_char checksum; 46 } pnp_id; 47 48 struct pnp_set_config_arg { 49 int csn; /* Card number to configure */ 50 int ldn; /* Logical device on card */ 51 }; 52 53 struct pnp_quirk { 54 u_int32_t vendor_id; /* Vendor of the card */ 55 u_int32_t logical_id; /* ID of the device with quirk */ 56 int type; 57 int arg1; 58 int arg2; 59 }; 60 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 64 struct 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 { 0x0100561e /* GRV0001 */, 0, 77 PNP_QUIRK_WRITE_REG, 0xf2, 0xff }, 78 /* 79 * An emu8000 does not give us other than the first 80 * port. 81 */ 82 { 0x26008c0e /* SB16 */, 0x21008c0e, 83 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 84 { 0x42008c0e /* SB32(CTL0042) */, 0x21008c0e, 85 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 86 { 0x44008c0e /* SB32(CTL0044) */, 0x21008c0e, 87 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 88 { 0x49008c0e /* SB32(CTL0049) */, 0x21008c0e, 89 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 90 { 0xf1008c0e /* SB32(CTL00f1) */, 0x21008c0e, 91 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 92 { 0xc1008c0e /* SB64(CTL00c1) */, 0x22008c0e, 93 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 94 { 0xc5008c0e /* SB64(CTL00c5) */, 0x22008c0e, 95 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 96 { 0xe4008c0e /* SB64(CTL00e4) */, 0x22008c0e, 97 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 98 99 { 0 } 100 }; 101 102 #if 0 103 /* 104 * these entries are initialized using the autoconfig menu 105 * The struct is invalid (and must be initialized) if the first 106 * CSN is zero. The init code fills invalid entries with CSN 255 107 * which is not a supported value. 108 */ 109 110 struct pnp_cinfo pnp_ldn_overrides[MAX_PNP_LDN] = { 111 { 0 } 112 }; 113 #endif 114 115 /* The READ_DATA port that we are using currently */ 116 static int pnp_rd_port; 117 118 static void pnp_send_initiation_key(void); 119 static int pnp_get_serial(pnp_id *p); 120 static int pnp_isolation_protocol(device_t parent); 121 122 char * 123 pnp_eisaformat(u_int32_t id) 124 { 125 u_int8_t *data = (u_int8_t *) &id; 126 static char idbuf[8]; 127 const char hextoascii[] = "0123456789abcdef"; 128 129 idbuf[0] = '@' + ((data[0] & 0x7c) >> 2); 130 idbuf[1] = '@' + (((data[0] & 0x3) << 3) + ((data[1] & 0xe0) >> 5)); 131 idbuf[2] = '@' + (data[1] & 0x1f); 132 idbuf[3] = hextoascii[(data[2] >> 4)]; 133 idbuf[4] = hextoascii[(data[2] & 0xf)]; 134 idbuf[5] = hextoascii[(data[3] >> 4)]; 135 idbuf[6] = hextoascii[(data[3] & 0xf)]; 136 idbuf[7] = 0; 137 return(idbuf); 138 } 139 140 static void 141 pnp_write(int d, u_char r) 142 { 143 outb (_PNP_ADDRESS, d); 144 outb (_PNP_WRITE_DATA, r); 145 } 146 147 #if 0 148 149 static u_char 150 pnp_read(int d) 151 { 152 outb (_PNP_ADDRESS, d); 153 return (inb(3 | (pnp_rd_port <<2))); 154 } 155 156 #endif 157 158 /* 159 * Send Initiation LFSR as described in "Plug and Play ISA Specification", 160 * Intel May 94. 161 */ 162 static void 163 pnp_send_initiation_key() 164 { 165 int cur, i; 166 167 /* Reset the LSFR */ 168 outb(_PNP_ADDRESS, 0); 169 outb(_PNP_ADDRESS, 0); /* yes, we do need it twice! */ 170 171 cur = 0x6a; 172 outb(_PNP_ADDRESS, cur); 173 174 for (i = 1; i < 32; i++) { 175 cur = (cur >> 1) | (((cur ^ (cur >> 1)) << 7) & 0xff); 176 outb(_PNP_ADDRESS, cur); 177 } 178 } 179 180 181 /* 182 * Get the device's serial number. Returns 1 if the serial is valid. 183 */ 184 static int 185 pnp_get_serial(pnp_id *p) 186 { 187 int i, bit, valid = 0, sum = 0x6a; 188 u_char *data = (u_char *)p; 189 190 bzero(data, sizeof(char) * 9); 191 outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION); 192 for (i = 0; i < 72; i++) { 193 bit = inb((pnp_rd_port << 2) | 0x3) == 0x55; 194 DELAY(250); /* Delay 250 usec */ 195 196 /* Can't Short Circuit the next evaluation, so 'and' is last */ 197 bit = (inb((pnp_rd_port << 2) | 0x3) == 0xaa) && bit; 198 DELAY(250); /* Delay 250 usec */ 199 200 valid = valid || bit; 201 202 if (i < 64) 203 sum = (sum >> 1) | 204 (((sum ^ (sum >> 1) ^ bit) << 7) & 0xff); 205 206 data[i / 8] = (data[i / 8] >> 1) | (bit ? 0x80 : 0); 207 } 208 209 valid = valid && (data[8] == sum); 210 211 return valid; 212 } 213 214 /* 215 * Fill's the buffer with resource info from the device. 216 * Returns the number of characters read. 217 */ 218 static int 219 pnp_get_resource_info(u_char *buffer, int len) 220 { 221 int i, j, count; 222 u_char temp; 223 224 count = 0; 225 for (i = 0; i < len; i++) { 226 outb(_PNP_ADDRESS, PNP_STATUS); 227 for (j = 0; j < 100; j++) { 228 if ((inb((pnp_rd_port << 2) | 0x3)) & 0x1) 229 break; 230 DELAY(1); 231 } 232 if (j == 100) { 233 printf("PnP device failed to report resource data\n"); 234 return count; 235 } 236 outb(_PNP_ADDRESS, PNP_RESOURCE_DATA); 237 temp = inb((pnp_rd_port << 2) | 0x3); 238 if (buffer != NULL) 239 buffer[i] = temp; 240 count++; 241 } 242 return count; 243 } 244 245 #if 0 246 /* 247 * write_pnp_parms initializes a logical device with the parms 248 * in d, and then activates the board if the last parameter is 1. 249 */ 250 251 static int 252 write_pnp_parms(struct pnp_cinfo *d, pnp_id *p, int ldn) 253 { 254 int i, empty = -1 ; 255 256 pnp_write (SET_LDN, ldn ); 257 i = pnp_read(SET_LDN) ; 258 if (i != ldn) { 259 printf("Warning: LDN %d does not exist\n", ldn); 260 } 261 for (i = 0; i < 8; i++) { 262 pnp_write(IO_CONFIG_BASE + i * 2, d->ic_port[i] >> 8 ); 263 pnp_write(IO_CONFIG_BASE + i * 2 + 1, d->ic_port[i] & 0xff ); 264 } 265 for (i = 0; i < 4; i++) { 266 pnp_write(MEM_CONFIG + i*8, (d->ic_mem[i].base >> 16) & 0xff ); 267 pnp_write(MEM_CONFIG + i*8+1, (d->ic_mem[i].base >> 8) & 0xff ); 268 pnp_write(MEM_CONFIG + i*8+2, d->ic_mem[i].control & 0xff ); 269 pnp_write(MEM_CONFIG + i*8+3, (d->ic_mem[i].range >> 16) & 0xff ); 270 pnp_write(MEM_CONFIG + i*8+4, (d->ic_mem[i].range >> 8) & 0xff ); 271 } 272 for (i = 0; i < 2; i++) { 273 pnp_write(IRQ_CONFIG + i*2 , d->irq[i] ); 274 pnp_write(IRQ_CONFIG + i*2 + 1, d->irq_type[i] ); 275 pnp_write(DRQ_CONFIG + i, d->drq[i] ); 276 } 277 /* 278 * store parameters read into the current kernel 279 * so manual editing next time is easier 280 */ 281 for (i = 0 ; i < MAX_PNP_LDN; i++) { 282 if (pnp_ldn_overrides[i].csn == d->csn && 283 pnp_ldn_overrides[i].ldn == ldn) { 284 d->flags = pnp_ldn_overrides[i].flags ; 285 pnp_ldn_overrides[i] = *d ; 286 break ; 287 } else if (pnp_ldn_overrides[i].csn < 1 || 288 pnp_ldn_overrides[i].csn == 255) 289 empty = i ; 290 } 291 if (i== MAX_PNP_LDN && empty != -1) 292 pnp_ldn_overrides[empty] = *d; 293 294 /* 295 * Here should really perform the range check, and 296 * return a failure if not successful. 297 */ 298 pnp_write (IO_RANGE_CHECK, 0); 299 DELAY(1000); /* XXX is it really necessary ? */ 300 pnp_write (ACTIVATE, d->enable ? 1 : 0); 301 DELAY(1000); /* XXX is it really necessary ? */ 302 return 1 ; 303 } 304 #endif 305 306 /* 307 * This function is called after the bus has assigned resource 308 * locations for a logical device. 309 */ 310 static void 311 pnp_set_config(void *arg, struct isa_config *config, int enable) 312 { 313 int csn = ((struct pnp_set_config_arg *) arg)->csn; 314 int ldn = ((struct pnp_set_config_arg *) arg)->ldn; 315 int i; 316 317 /* 318 * First put all cards into Sleep state with the initiation 319 * key, then put our card into Config state. 320 */ 321 pnp_send_initiation_key(); 322 pnp_write(PNP_WAKE, csn); 323 324 /* 325 * Select our logical device so that we can program it. 326 */ 327 pnp_write(PNP_SET_LDN, ldn); 328 329 /* 330 * Now program the resources. 331 */ 332 for (i = 0; i < config->ic_nmem; i++) { 333 u_int32_t start = config->ic_mem[i].ir_start; 334 u_int32_t size = config->ic_mem[i].ir_size; 335 if (start & 0xff) 336 panic("pnp_set_config: bogus memory assignment"); 337 pnp_write(PNP_MEM_BASE_HIGH(i), (start >> 16) & 0xff); 338 pnp_write(PNP_MEM_BASE_LOW(i), (start >> 8) & 0xff); 339 pnp_write(PNP_MEM_RANGE_HIGH(i), (size >> 16) & 0xff); 340 pnp_write(PNP_MEM_RANGE_LOW(i), (size >> 8) & 0xff); 341 } 342 for (; i < ISA_NMEM; i++) { 343 pnp_write(PNP_MEM_BASE_HIGH(i), 0); 344 pnp_write(PNP_MEM_BASE_LOW(i), 0); 345 pnp_write(PNP_MEM_RANGE_HIGH(i), 0); 346 pnp_write(PNP_MEM_RANGE_LOW(i), 0); 347 } 348 349 for (i = 0; i < config->ic_nport; i++) { 350 u_int32_t start = config->ic_port[i].ir_start; 351 pnp_write(PNP_IO_BASE_HIGH(i), (start >> 8) & 0xff); 352 pnp_write(PNP_IO_BASE_LOW(i), (start >> 0) & 0xff); 353 } 354 for (; i < ISA_NPORT; i++) { 355 pnp_write(PNP_IO_BASE_HIGH(i), 0); 356 pnp_write(PNP_IO_BASE_LOW(i), 0); 357 } 358 359 for (i = 0; i < config->ic_nirq; i++) { 360 int irq = ffs(config->ic_irqmask[i]) - 1; 361 pnp_write(PNP_IRQ_LEVEL(i), irq); 362 pnp_write(PNP_IRQ_TYPE(i), 2); /* XXX */ 363 } 364 for (; i < ISA_NIRQ; i++) { 365 /* 366 * IRQ 0 is not a valid interrupt selection and 367 * represents no interrupt selection. 368 */ 369 pnp_write(PNP_IRQ_LEVEL(i), 0); 370 } 371 372 for (i = 0; i < config->ic_ndrq; i++) { 373 int drq = ffs(config->ic_drqmask[i]) - 1; 374 pnp_write(PNP_DMA_CHANNEL(i), drq); 375 } 376 for (; i < ISA_NDRQ; i++) { 377 /* 378 * DMA channel 4, the cascade channel is used to 379 * indicate no DMA channel is active. 380 */ 381 pnp_write(PNP_DMA_CHANNEL(i), 4); 382 } 383 384 pnp_write(PNP_ACTIVATE, enable ? 1 : 0); 385 386 /* 387 * Wake everyone up again, we are finished. 388 */ 389 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY); 390 } 391 392 /* 393 * Process quirks for a logical device.. The card must be in Config state. 394 */ 395 void 396 pnp_check_quirks(u_int32_t vendor_id, u_int32_t logical_id, 397 int ldn, struct isa_config *config) 398 { 399 struct pnp_quirk *qp; 400 401 for (qp = &pnp_quirks[0]; qp->vendor_id; qp++) { 402 if (qp->vendor_id == vendor_id 403 && (qp->logical_id == 0 404 || qp->logical_id == logical_id)) { 405 switch (qp->type) { 406 case PNP_QUIRK_WRITE_REG: 407 pnp_write(PNP_SET_LDN, ldn); 408 pnp_write(qp->arg1, qp->arg2); 409 break; 410 case PNP_QUIRK_EXTRA_IO: 411 if (config == NULL) 412 break; 413 if (qp->arg1 != 0) { 414 config->ic_nport++; 415 config->ic_port[config->ic_nport - 1] = config->ic_port[0]; 416 config->ic_port[config->ic_nport - 1].ir_start += qp->arg1; 417 config->ic_port[config->ic_nport - 1].ir_end += qp->arg1; 418 } 419 if (qp->arg2 != 0) { 420 config->ic_nport++; 421 config->ic_port[config->ic_nport - 1] = config->ic_port[0]; 422 config->ic_port[config->ic_nport - 1].ir_start += qp->arg2; 423 config->ic_port[config->ic_nport - 1].ir_end += qp->arg2; 424 } 425 break; 426 427 } 428 } 429 } 430 } 431 432 /* 433 * Scan Resource Data for Logical Devices. 434 * 435 * This function exits as soon as it gets an error reading *ANY* 436 * Resource Data or it reaches the end of Resource Data. In the first 437 * case the return value will be TRUE, FALSE otherwise. 438 */ 439 static int 440 pnp_create_devices(device_t parent, pnp_id *p, int csn, 441 u_char *resources, int len) 442 { 443 u_char tag, *resp, *resinfo, *startres = 0; 444 int large_len, scanning = len, retval = FALSE; 445 u_int32_t logical_id; 446 u_int32_t compat_id; 447 device_t dev = 0; 448 int ldn = 0; 449 struct pnp_set_config_arg *csnldn; 450 char buf[100]; 451 char *desc = 0; 452 453 resp = resources; 454 while (scanning > 0) { 455 tag = *resp++; 456 scanning--; 457 if (PNP_RES_TYPE(tag) != 0) { 458 /* Large resource */ 459 if (scanning < 2) { 460 scanning = 0; 461 continue; 462 } 463 large_len = resp[0] + (resp[1] << 8); 464 resp += 2; 465 466 if (scanning < large_len) { 467 scanning = 0; 468 continue; 469 } 470 resinfo = resp; 471 resp += large_len; 472 scanning -= large_len; 473 474 if (PNP_LRES_NUM(tag) == PNP_TAG_ID_ANSI) { 475 if (large_len > sizeof(buf) - 1) 476 large_len = sizeof(buf) - 1; 477 bcopy(resinfo, buf, large_len); 478 479 /* 480 * Trim trailing spaces. 481 */ 482 while (buf[large_len-1] == ' ') 483 large_len--; 484 buf[large_len] = '\0'; 485 desc = buf; 486 if (dev) 487 device_set_desc_copy(dev, desc); 488 continue; 489 } 490 491 continue; 492 } 493 494 /* Small resource */ 495 if (scanning < PNP_SRES_LEN(tag)) { 496 scanning = 0; 497 continue; 498 } 499 resinfo = resp; 500 resp += PNP_SRES_LEN(tag); 501 scanning -= PNP_SRES_LEN(tag);; 502 503 switch (PNP_SRES_NUM(tag)) { 504 case PNP_TAG_LOGICAL_DEVICE: 505 /* 506 * Parse the resources for the previous 507 * logical device (if any). 508 */ 509 if (startres) { 510 pnp_parse_resources(dev, startres, 511 resinfo - startres - 1, ldn); 512 dev = 0; 513 startres = 0; 514 } 515 516 /* 517 * A new logical device. Scan for end of 518 * resources. 519 */ 520 bcopy(resinfo, &logical_id, 4); 521 pnp_check_quirks(p->vendor_id, logical_id, ldn, NULL); 522 compat_id = 0; 523 dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNP, NULL, -1); 524 if (desc) 525 device_set_desc_copy(dev, desc); 526 isa_set_vendorid(dev, p->vendor_id); 527 isa_set_serial(dev, p->serial); 528 isa_set_logicalid(dev, logical_id); 529 csnldn = malloc(sizeof *csnldn, M_DEVBUF, M_WAITOK); 530 csnldn->csn = csn; 531 csnldn->ldn = ldn; 532 ISA_SET_CONFIG_CALLBACK(parent, dev, 533 pnp_set_config, csnldn); 534 ldn++; 535 startres = resp; 536 break; 537 538 case PNP_TAG_END: 539 if (!startres) { 540 device_printf(parent, 541 "malformed resources\n"); 542 scanning = 0; 543 break; 544 } 545 pnp_parse_resources(dev, startres, 546 resinfo - startres - 1, ldn); 547 dev = 0; 548 startres = 0; 549 scanning = 0; 550 break; 551 552 default: 553 /* Skip this resource */ 554 break; 555 } 556 } 557 558 return retval; 559 } 560 561 /* 562 * Read 'amount' bytes of resources from the card, allocating memory 563 * as needed. If a buffer is already available, it should be passed in 564 * '*resourcesp' and its length in '*spacep'. The number of resource 565 * bytes already in the buffer should be passed in '*lenp'. The memory 566 * allocated will be returned in '*resourcesp' with its size and the 567 * number of bytes of resources in '*spacep' and '*lenp' respectively. 568 */ 569 static int 570 pnp_read_bytes(int amount, u_char **resourcesp, int *spacep, int *lenp) 571 { 572 u_char *resources = *resourcesp; 573 u_char *newres; 574 int space = *spacep; 575 int len = *lenp; 576 577 if (space == 0) { 578 space = 1024; 579 resources = malloc(space, M_TEMP, M_WAITOK); 580 } 581 582 if (len + amount > space) { 583 int extra = 1024; 584 while (len + amount > space + extra) 585 extra += 1024; 586 newres = malloc(space + extra, M_TEMP, M_WAITOK); 587 bcopy(resources, newres, len); 588 free(resources, M_TEMP); 589 resources = newres; 590 space += extra; 591 } 592 593 if (pnp_get_resource_info(resources + len, amount) != amount) 594 return EINVAL; 595 len += amount; 596 597 *resourcesp = resources; 598 *spacep = space; 599 *lenp = len; 600 601 return 0; 602 } 603 604 /* 605 * Read all resources from the card, allocating memory as needed. If a 606 * buffer is already available, it should be passed in '*resourcesp' 607 * and its length in '*spacep'. The memory allocated will be returned 608 * in '*resourcesp' with its size and the number of bytes of resources 609 * in '*spacep' and '*lenp' respectively. 610 */ 611 static int 612 pnp_read_resources(u_char **resourcesp, int *spacep, int *lenp) 613 { 614 u_char *resources = *resourcesp; 615 int space = *spacep; 616 int len = 0; 617 int error, done; 618 u_char tag; 619 620 error = 0; 621 done = 0; 622 while (!done) { 623 error = pnp_read_bytes(1, &resources, &space, &len); 624 if (error) 625 goto out; 626 tag = resources[len-1]; 627 if (PNP_RES_TYPE(tag) == 0) { 628 /* 629 * Small resource, read contents. 630 */ 631 error = pnp_read_bytes(PNP_SRES_LEN(tag), 632 &resources, &space, &len); 633 if (error) 634 goto out; 635 if (PNP_SRES_NUM(tag) == PNP_TAG_END) 636 done = 1; 637 } else { 638 /* 639 * Large resource, read length and contents. 640 */ 641 error = pnp_read_bytes(2, &resources, &space, &len); 642 if (error) 643 goto out; 644 error = pnp_read_bytes(resources[len-2] 645 + (resources[len-1] << 8), 646 &resources, &space, &len); 647 if (error) 648 goto out; 649 } 650 } 651 652 out: 653 *resourcesp = resources; 654 *spacep = space; 655 *lenp = len; 656 return error; 657 } 658 659 /* 660 * Run the isolation protocol. Use pnp_rd_port as the READ_DATA port 661 * value (caller should try multiple READ_DATA locations before giving 662 * up). Upon exiting, all cards are aware that they should use 663 * pnp_rd_port as the READ_DATA port. 664 * 665 * In the first pass, a csn is assigned to each board and pnp_id's 666 * are saved to an array, pnp_devices. In the second pass, each 667 * card is woken up and the device configuration is called. 668 */ 669 static int 670 pnp_isolation_protocol(device_t parent) 671 { 672 int csn; 673 pnp_id id; 674 int found = 0, len; 675 u_char *resources = 0; 676 int space = 0; 677 int error; 678 679 /* 680 * Put all cards into the Sleep state so that we can clear 681 * their CSNs. 682 */ 683 pnp_send_initiation_key(); 684 685 /* 686 * Clear the CSN for all cards. 687 */ 688 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_RESET_CSN); 689 690 /* 691 * Move all cards to the Isolation state. 692 */ 693 pnp_write(PNP_WAKE, 0); 694 695 /* 696 * Tell them where the read point is going to be this time. 697 */ 698 pnp_write(PNP_SET_RD_DATA, pnp_rd_port); 699 700 for (csn = 1; csn < PNP_MAX_CARDS; csn++) { 701 /* 702 * Start the serial isolation protocol. 703 */ 704 outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION); 705 DELAY(1000); /* Delay 1 msec */ 706 707 if (pnp_get_serial(&id)) { 708 /* 709 * We have read the id from a card 710 * successfully. The card which won the 711 * isolation protocol will be in Isolation 712 * mode and all others will be in Sleep. 713 * Program the CSN of the isolated card 714 * (taking it to Config state) and read its 715 * resources, creating devices as we find 716 * logical devices on the card. 717 */ 718 pnp_write(PNP_SET_CSN, csn); 719 720 error = pnp_read_resources(&resources, 721 &space, 722 &len); 723 if (error) 724 break; 725 pnp_create_devices(parent, &id, csn, 726 resources, len); 727 found++; 728 } else 729 break; 730 731 /* 732 * Put this card back to the Sleep state and 733 * simultaneously move all cards which don't have a 734 * CSN yet to Isolation state. 735 */ 736 pnp_write(PNP_WAKE, 0); 737 } 738 739 /* 740 * Unless we have chosen the wrong read port, all cards will 741 * be in Sleep state. Put them back into WaitForKey for 742 * now. Their resources will be programmed later. 743 */ 744 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY); 745 746 /* 747 * Cleanup. 748 */ 749 if (resources) 750 free(resources, M_TEMP); 751 752 return found; 753 } 754 755 756 /* 757 * pnp_identify() 758 * 759 * autoconfiguration of pnp devices. This routine just runs the 760 * isolation protocol over several ports, until one is successful. 761 * 762 * may be called more than once ? 763 * 764 */ 765 766 static void 767 pnp_identify(driver_t *driver, device_t parent) 768 { 769 int num_pnp_devs; 770 771 #if 0 772 if (pnp_ldn_overrides[0].csn == 0) { 773 if (bootverbose) 774 printf("Initializing PnP override table\n"); 775 bzero (pnp_ldn_overrides, sizeof(pnp_ldn_overrides)); 776 pnp_ldn_overrides[0].csn = 255 ; 777 } 778 #endif 779 780 /* Try various READ_DATA ports from 0x203-0x3ff */ 781 for (pnp_rd_port = 0x80; (pnp_rd_port < 0xff); pnp_rd_port += 0x10) { 782 if (bootverbose) 783 printf("Trying Read_Port at %x\n", (pnp_rd_port << 2) | 0x3); 784 785 num_pnp_devs = pnp_isolation_protocol(parent); 786 if (num_pnp_devs) 787 break; 788 } 789 } 790 791 static device_method_t pnp_methods[] = { 792 /* Device interface */ 793 DEVMETHOD(device_identify, pnp_identify), 794 795 { 0, 0 } 796 }; 797 798 static driver_t pnp_driver = { 799 "pnp", 800 pnp_methods, 801 1, /* no softc */ 802 }; 803 804 static devclass_t pnp_devclass; 805 806 DRIVER_MODULE(pnp, isa, pnp_driver, pnp_devclass, 0, 0); 807