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 * 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 "isavar.h" 37 #include "pnpreg.h" 38 #include "pnpvar.h" 39 #include <machine/clock.h> 40 41 typedef struct _pnp_id { 42 u_int32_t vendor_id; 43 u_int32_t serial; 44 u_char checksum; 45 } pnp_id; 46 47 struct pnp_set_config_arg { 48 int csn; /* Card number to configure */ 49 int ldn; /* Logical device on card */ 50 }; 51 52 struct 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 int arg1; 57 int arg2; 58 }; 59 60 #define PNP_QUIRK_WRITE_REG 1 /* Need to write a pnp register */ 61 #define PNP_QUIRK_EXTRA_IO 2 /* Has extra io ports */ 62 63 struct pnp_quirk pnp_quirks[] = { 64 /* 65 * The Gravis UltraSound needs register 0xf2 to be set to 0xff 66 * to enable power. 67 * XXX need to know the logical device id. 68 */ 69 { 0x0100561e /* GRV0001 */, 0, 70 PNP_QUIRK_WRITE_REG, 0xf2, 0xff }, 71 /* 72 * An emu8000 does not give us other than the first 73 * port. 74 */ 75 { 0x0100561e /* GRV0001 */, 0, 76 PNP_QUIRK_WRITE_REG, 0xf2, 0xff }, 77 /* 78 * An emu8000 does not give us other than the first 79 * port. 80 */ 81 { 0x26008c0e /* SB16 */, 0x21008c0e, 82 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 83 { 0x42008c0e /* SB32(CTL0042) */, 0x21008c0e, 84 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 85 { 0x44008c0e /* SB32(CTL0044) */, 0x21008c0e, 86 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 87 { 0x49008c0e /* SB32(CTL0049) */, 0x21008c0e, 88 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 89 { 0xf1008c0e /* SB32(CTL00f1) */, 0x21008c0e, 90 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 91 { 0xc1008c0e /* SB64(CTL00c1) */, 0x22008c0e, 92 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 93 { 0xc5008c0e /* SB64(CTL00c5) */, 0x22008c0e, 94 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 95 { 0xe4008c0e /* SB64(CTL00e4) */, 0x22008c0e, 96 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 }, 97 98 { 0 } 99 }; 100 101 #if 0 102 /* 103 * these entries are initialized using the autoconfig menu 104 * The struct is invalid (and must be initialized) if the first 105 * CSN is zero. The init code fills invalid entries with CSN 255 106 * which is not a supported value. 107 */ 108 109 struct pnp_cinfo pnp_ldn_overrides[MAX_PNP_LDN] = { 110 { 0 } 111 }; 112 #endif 113 114 /* The READ_DATA port that we are using currently */ 115 static int pnp_rd_port; 116 117 static void pnp_send_initiation_key(void); 118 static int pnp_get_serial(pnp_id *p); 119 static int pnp_isolation_protocol(device_t parent); 120 121 char * 122 pnp_eisaformat(u_int32_t id) 123 { 124 u_int8_t *data = (u_int8_t *) &id; 125 static char idbuf[8]; 126 const char hextoascii[] = "0123456789abcdef"; 127 128 idbuf[0] = '@' + ((data[0] & 0x7c) >> 2); 129 idbuf[1] = '@' + (((data[0] & 0x3) << 3) + ((data[1] & 0xe0) >> 5)); 130 idbuf[2] = '@' + (data[1] & 0x1f); 131 idbuf[3] = hextoascii[(data[2] >> 4)]; 132 idbuf[4] = hextoascii[(data[2] & 0xf)]; 133 idbuf[5] = hextoascii[(data[3] >> 4)]; 134 idbuf[6] = hextoascii[(data[3] & 0xf)]; 135 idbuf[7] = 0; 136 return(idbuf); 137 } 138 139 static void 140 pnp_write(int d, u_char r) 141 { 142 outb (_PNP_ADDRESS, d); 143 outb (_PNP_WRITE_DATA, r); 144 } 145 146 #if 0 147 148 static u_char 149 pnp_read(int d) 150 { 151 outb (_PNP_ADDRESS, d); 152 return (inb(3 | (pnp_rd_port <<2))); 153 } 154 155 #endif 156 157 /* 158 * Send Initiation LFSR as described in "Plug and Play ISA Specification", 159 * Intel May 94. 160 */ 161 static void 162 pnp_send_initiation_key(void) 163 { 164 int cur, i; 165 166 /* Reset the LSFR */ 167 outb(_PNP_ADDRESS, 0); 168 outb(_PNP_ADDRESS, 0); /* yes, we do need it twice! */ 169 170 cur = 0x6a; 171 outb(_PNP_ADDRESS, cur); 172 173 for (i = 1; i < 32; i++) { 174 cur = (cur >> 1) | (((cur ^ (cur >> 1)) << 7) & 0xff); 175 outb(_PNP_ADDRESS, cur); 176 } 177 } 178 179 180 /* 181 * Get the device's serial number. Returns 1 if the serial is valid. 182 */ 183 static int 184 pnp_get_serial(pnp_id *p) 185 { 186 int i, bit, valid = 0, sum = 0x6a; 187 u_char *data = (u_char *)p; 188 189 bzero(data, sizeof(char) * 9); 190 outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION); 191 for (i = 0; i < 72; i++) { 192 bit = inb((pnp_rd_port << 2) | 0x3) == 0x55; 193 DELAY(250); /* Delay 250 usec */ 194 195 /* Can't Short Circuit the next evaluation, so 'and' is last */ 196 bit = (inb((pnp_rd_port << 2) | 0x3) == 0xaa) && bit; 197 DELAY(250); /* Delay 250 usec */ 198 199 valid = valid || bit; 200 201 if (i < 64) 202 sum = (sum >> 1) | 203 (((sum ^ (sum >> 1) ^ bit) << 7) & 0xff); 204 205 data[i / 8] = (data[i / 8] >> 1) | (bit ? 0x80 : 0); 206 } 207 208 valid = valid && (data[8] == sum); 209 210 return valid; 211 } 212 213 /* 214 * Fill's the buffer with resource info from the device. 215 * Returns the number of characters read. 216 */ 217 static int 218 pnp_get_resource_info(u_char *buffer, int len) 219 { 220 int i, j, count; 221 u_char temp; 222 223 count = 0; 224 for (i = 0; i < len; i++) { 225 outb(_PNP_ADDRESS, PNP_STATUS); 226 for (j = 0; j < 100; j++) { 227 if ((inb((pnp_rd_port << 2) | 0x3)) & 0x1) 228 break; 229 DELAY(1); 230 } 231 if (j == 100) { 232 kprintf("PnP device failed to report resource data\n"); 233 return count; 234 } 235 outb(_PNP_ADDRESS, PNP_RESOURCE_DATA); 236 temp = inb((pnp_rd_port << 2) | 0x3); 237 if (buffer != NULL) 238 buffer[i] = temp; 239 count++; 240 } 241 return count; 242 } 243 244 #if 0 245 /* 246 * write_pnp_parms initializes a logical device with the parms 247 * in d, and then activates the board if the last parameter is 1. 248 */ 249 250 static int 251 write_pnp_parms(struct pnp_cinfo *d, pnp_id *p, int ldn) 252 { 253 int i, empty = -1 ; 254 255 pnp_write (SET_LDN, ldn ); 256 i = pnp_read(SET_LDN) ; 257 if (i != ldn) { 258 kprintf("Warning: LDN %d does not exist\n", ldn); 259 } 260 for (i = 0; i < 8; i++) { 261 pnp_write(IO_CONFIG_BASE + i * 2, d->ic_port[i] >> 8 ); 262 pnp_write(IO_CONFIG_BASE + i * 2 + 1, d->ic_port[i] & 0xff ); 263 } 264 for (i = 0; i < 4; i++) { 265 pnp_write(MEM_CONFIG + i*8, (d->ic_mem[i].base >> 16) & 0xff ); 266 pnp_write(MEM_CONFIG + i*8+1, (d->ic_mem[i].base >> 8) & 0xff ); 267 pnp_write(MEM_CONFIG + i*8+2, d->ic_mem[i].control & 0xff ); 268 pnp_write(MEM_CONFIG + i*8+3, (d->ic_mem[i].range >> 16) & 0xff ); 269 pnp_write(MEM_CONFIG + i*8+4, (d->ic_mem[i].range >> 8) & 0xff ); 270 } 271 for (i = 0; i < 2; i++) { 272 pnp_write(IRQ_CONFIG + i*2 , d->irq[i] ); 273 pnp_write(IRQ_CONFIG + i*2 + 1, d->irq_type[i] ); 274 pnp_write(DRQ_CONFIG + i, d->drq[i] ); 275 } 276 /* 277 * store parameters read into the current kernel 278 * so manual editing next time is easier 279 */ 280 for (i = 0 ; i < MAX_PNP_LDN; i++) { 281 if (pnp_ldn_overrides[i].csn == d->csn && 282 pnp_ldn_overrides[i].ldn == ldn) { 283 d->flags = pnp_ldn_overrides[i].flags ; 284 pnp_ldn_overrides[i] = *d ; 285 break ; 286 } else if (pnp_ldn_overrides[i].csn < 1 || 287 pnp_ldn_overrides[i].csn == 255) 288 empty = i ; 289 } 290 if (i== MAX_PNP_LDN && empty != -1) 291 pnp_ldn_overrides[empty] = *d; 292 293 /* 294 * Here should really perform the range check, and 295 * return a failure if not successful. 296 */ 297 pnp_write (IO_RANGE_CHECK, 0); 298 DELAY(1000); /* XXX is it really necessary ? */ 299 pnp_write (ACTIVATE, d->enable ? 1 : 0); 300 DELAY(1000); /* XXX is it really necessary ? */ 301 return 1 ; 302 } 303 #endif 304 305 /* 306 * This function is called after the bus has assigned resource 307 * locations for a logical device. 308 */ 309 static void 310 pnp_set_config(void *arg, struct isa_config *config, int enable) 311 { 312 int csn = ((struct pnp_set_config_arg *) arg)->csn; 313 int ldn = ((struct pnp_set_config_arg *) arg)->ldn; 314 int i; 315 316 /* 317 * First put all cards into Sleep state with the initiation 318 * key, then put our card into Config state. 319 */ 320 pnp_send_initiation_key(); 321 pnp_write(PNP_WAKE, csn); 322 323 /* 324 * Select our logical device so that we can program it. 325 */ 326 pnp_write(PNP_SET_LDN, ldn); 327 328 /* 329 * Now program the resources. 330 */ 331 for (i = 0; i < config->ic_nmem; i++) { 332 u_int32_t start = config->ic_mem[i].ir_start; 333 u_int32_t size = config->ic_mem[i].ir_size; 334 if (start & 0xff) 335 panic("pnp_set_config: bogus memory assignment"); 336 pnp_write(PNP_MEM_BASE_HIGH(i), (start >> 16) & 0xff); 337 pnp_write(PNP_MEM_BASE_LOW(i), (start >> 8) & 0xff); 338 pnp_write(PNP_MEM_RANGE_HIGH(i), (size >> 16) & 0xff); 339 pnp_write(PNP_MEM_RANGE_LOW(i), (size >> 8) & 0xff); 340 } 341 for (; i < ISA_NMEM; i++) { 342 pnp_write(PNP_MEM_BASE_HIGH(i), 0); 343 pnp_write(PNP_MEM_BASE_LOW(i), 0); 344 pnp_write(PNP_MEM_RANGE_HIGH(i), 0); 345 pnp_write(PNP_MEM_RANGE_LOW(i), 0); 346 } 347 348 for (i = 0; i < config->ic_nport; i++) { 349 u_int32_t start = config->ic_port[i].ir_start; 350 pnp_write(PNP_IO_BASE_HIGH(i), (start >> 8) & 0xff); 351 pnp_write(PNP_IO_BASE_LOW(i), (start >> 0) & 0xff); 352 } 353 for (; i < ISA_NPORT; i++) { 354 pnp_write(PNP_IO_BASE_HIGH(i), 0); 355 pnp_write(PNP_IO_BASE_LOW(i), 0); 356 } 357 358 for (i = 0; i < config->ic_nirq; i++) { 359 int irq = ffs(config->ic_irqmask[i]) - 1; 360 pnp_write(PNP_IRQ_LEVEL(i), irq); 361 pnp_write(PNP_IRQ_TYPE(i), 2); /* XXX */ 362 } 363 for (; i < ISA_NIRQ; i++) { 364 /* 365 * IRQ 0 is not a valid interrupt selection and 366 * represents no interrupt selection. 367 */ 368 pnp_write(PNP_IRQ_LEVEL(i), 0); 369 } 370 371 for (i = 0; i < config->ic_ndrq; i++) { 372 int drq = ffs(config->ic_drqmask[i]) - 1; 373 pnp_write(PNP_DMA_CHANNEL(i), drq); 374 } 375 for (; i < ISA_NDRQ; i++) { 376 /* 377 * DMA channel 4, the cascade channel is used to 378 * indicate no DMA channel is active. 379 */ 380 pnp_write(PNP_DMA_CHANNEL(i), 4); 381 } 382 383 pnp_write(PNP_ACTIVATE, enable ? 1 : 0); 384 385 /* 386 * Wake everyone up again, we are finished. 387 */ 388 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY); 389 } 390 391 /* 392 * Process quirks for a logical device.. The card must be in Config state. 393 */ 394 void 395 pnp_check_quirks(u_int32_t vendor_id, u_int32_t logical_id, 396 int ldn, struct isa_config *config) 397 { 398 struct pnp_quirk *qp; 399 400 for (qp = &pnp_quirks[0]; qp->vendor_id; qp++) { 401 if (qp->vendor_id == vendor_id 402 && (qp->logical_id == 0 403 || qp->logical_id == logical_id)) { 404 switch (qp->type) { 405 case PNP_QUIRK_WRITE_REG: 406 pnp_write(PNP_SET_LDN, ldn); 407 pnp_write(qp->arg1, qp->arg2); 408 break; 409 case PNP_QUIRK_EXTRA_IO: 410 if (config == NULL) 411 break; 412 if (qp->arg1 != 0) { 413 config->ic_nport++; 414 config->ic_port[config->ic_nport - 1] = config->ic_port[0]; 415 config->ic_port[config->ic_nport - 1].ir_start += qp->arg1; 416 config->ic_port[config->ic_nport - 1].ir_end += qp->arg1; 417 } 418 if (qp->arg2 != 0) { 419 config->ic_nport++; 420 config->ic_port[config->ic_nport - 1] = config->ic_port[0]; 421 config->ic_port[config->ic_nport - 1].ir_start += qp->arg2; 422 config->ic_port[config->ic_nport - 1].ir_end += qp->arg2; 423 } 424 break; 425 426 } 427 } 428 } 429 } 430 431 /* 432 * Scan Resource Data for Logical Devices. 433 * 434 * This function exits as soon as it gets an error reading *ANY* 435 * Resource Data or it reaches the end of Resource Data. In the first 436 * case the return value will be TRUE, FALSE otherwise. 437 */ 438 static int 439 pnp_create_devices(device_t parent, pnp_id *p, int csn, 440 u_char *resources, int len) 441 { 442 u_char tag, *resp, *resinfo, *startres = NULL; 443 int large_len, scanning = len, retval = FALSE; 444 u_int32_t logical_id; 445 device_t dev = NULL; 446 int ldn = 0; 447 struct pnp_set_config_arg *csnldn; 448 char buf[100]; 449 char *desc = NULL; 450 451 resp = resources; 452 while (scanning > 0) { 453 tag = *resp++; 454 scanning--; 455 if (PNP_RES_TYPE(tag) != 0) { 456 /* Large resource */ 457 if (scanning < 2) { 458 scanning = 0; 459 continue; 460 } 461 large_len = resp[0] + (resp[1] << 8); 462 resp += 2; 463 464 if (scanning < large_len) { 465 scanning = 0; 466 continue; 467 } 468 resinfo = resp; 469 resp += large_len; 470 scanning -= large_len; 471 472 if (PNP_LRES_NUM(tag) == PNP_TAG_ID_ANSI) { 473 if (large_len > sizeof(buf) - 1) 474 large_len = sizeof(buf) - 1; 475 bcopy(resinfo, buf, large_len); 476 477 /* 478 * Trim trailing spaces. 479 */ 480 while (buf[large_len-1] == ' ') 481 large_len--; 482 buf[large_len] = '\0'; 483 desc = buf; 484 if (dev) 485 device_set_desc_copy(dev, desc); 486 continue; 487 } 488 489 continue; 490 } 491 492 /* Small resource */ 493 if (scanning < PNP_SRES_LEN(tag)) { 494 scanning = 0; 495 continue; 496 } 497 resinfo = resp; 498 resp += PNP_SRES_LEN(tag); 499 scanning -= PNP_SRES_LEN(tag); 500 501 switch (PNP_SRES_NUM(tag)) { 502 case PNP_TAG_LOGICAL_DEVICE: 503 /* 504 * Parse the resources for the previous 505 * logical device (if any). 506 */ 507 if (startres) { 508 pnp_parse_resources(dev, startres, 509 resinfo - startres - 1, ldn); 510 dev = NULL; 511 startres = NULL; 512 } 513 514 /* 515 * A new logical device. Scan for end of 516 * resources. 517 */ 518 bcopy(resinfo, &logical_id, 4); 519 pnp_check_quirks(p->vendor_id, logical_id, ldn, NULL); 520 dev = BUS_ADD_CHILD(parent, parent, ISA_ORDER_PNP, 521 NULL, -1); 522 if (desc) 523 device_set_desc_copy(dev, desc); 524 isa_set_vendorid(dev, p->vendor_id); 525 isa_set_serial(dev, p->serial); 526 isa_set_logicalid(dev, logical_id); 527 csnldn = kmalloc(sizeof *csnldn, M_DEVBUF, M_WAITOK); 528 csnldn->csn = csn; 529 csnldn->ldn = ldn; 530 ISA_SET_CONFIG_CALLBACK(parent, dev, 531 pnp_set_config, csnldn); 532 ldn++; 533 startres = resp; 534 break; 535 536 case PNP_TAG_END: 537 if (!startres) { 538 device_printf(parent, 539 "malformed resources\n"); 540 scanning = 0; 541 break; 542 } 543 pnp_parse_resources(dev, startres, 544 resinfo - startres - 1, ldn); 545 dev = NULL; 546 startres = NULL; 547 scanning = 0; 548 break; 549 550 default: 551 /* Skip this resource */ 552 break; 553 } 554 } 555 556 return retval; 557 } 558 559 /* 560 * Read 'amount' bytes of resources from the card, allocating memory 561 * as needed. If a buffer is already available, it should be passed in 562 * '*resourcesp' and its length in '*spacep'. The number of resource 563 * bytes already in the buffer should be passed in '*lenp'. The memory 564 * allocated will be returned in '*resourcesp' with its size and the 565 * number of bytes of resources in '*spacep' and '*lenp' respectively. 566 */ 567 static int 568 pnp_read_bytes(int amount, u_char **resourcesp, int *spacep, int *lenp) 569 { 570 u_char *resources = *resourcesp; 571 u_char *newres; 572 int space = *spacep; 573 int len = *lenp; 574 575 if (space == 0) { 576 space = 1024; 577 resources = kmalloc(space, M_TEMP, M_WAITOK); 578 } 579 580 if (len + amount > space) { 581 int extra = 1024; 582 while (len + amount > space + extra) 583 extra += 1024; 584 newres = kmalloc(space + extra, M_TEMP, M_WAITOK); 585 bcopy(resources, newres, len); 586 kfree(resources, M_TEMP); 587 resources = newres; 588 space += extra; 589 } 590 591 if (pnp_get_resource_info(resources + len, amount) != amount) 592 return EINVAL; 593 len += amount; 594 595 *resourcesp = resources; 596 *spacep = space; 597 *lenp = len; 598 599 return 0; 600 } 601 602 /* 603 * Read all resources from the card, allocating memory as needed. If a 604 * buffer is already available, it should be passed in '*resourcesp' 605 * and its length in '*spacep'. The memory allocated will be returned 606 * in '*resourcesp' with its size and the number of bytes of resources 607 * in '*spacep' and '*lenp' respectively. 608 */ 609 static int 610 pnp_read_resources(u_char **resourcesp, int *spacep, int *lenp) 611 { 612 u_char *resources = *resourcesp; 613 int space = *spacep; 614 int len = 0; 615 int error, done; 616 u_char tag; 617 618 error = 0; 619 done = 0; 620 while (!done) { 621 error = pnp_read_bytes(1, &resources, &space, &len); 622 if (error) 623 goto out; 624 tag = resources[len-1]; 625 if (PNP_RES_TYPE(tag) == 0) { 626 /* 627 * Small resource, read contents. 628 */ 629 error = pnp_read_bytes(PNP_SRES_LEN(tag), 630 &resources, &space, &len); 631 if (error) 632 goto out; 633 if (PNP_SRES_NUM(tag) == PNP_TAG_END) 634 done = 1; 635 } else { 636 /* 637 * Large resource, read length and contents. 638 */ 639 error = pnp_read_bytes(2, &resources, &space, &len); 640 if (error) 641 goto out; 642 error = pnp_read_bytes(resources[len-2] 643 + (resources[len-1] << 8), 644 &resources, &space, &len); 645 if (error) 646 goto out; 647 } 648 } 649 650 out: 651 *resourcesp = resources; 652 *spacep = space; 653 *lenp = len; 654 return error; 655 } 656 657 /* 658 * Run the isolation protocol. Use pnp_rd_port as the READ_DATA port 659 * value (caller should try multiple READ_DATA locations before giving 660 * up). Upon exiting, all cards are aware that they should use 661 * pnp_rd_port as the READ_DATA port. 662 * 663 * In the first pass, a csn is assigned to each board and pnp_id's 664 * are saved to an array, pnp_devices. In the second pass, each 665 * card is woken up and the device configuration is called. 666 */ 667 static int 668 pnp_isolation_protocol(device_t parent) 669 { 670 int csn; 671 pnp_id id; 672 int found = 0, len; 673 u_char *resources = NULL; 674 int space = 0; 675 int error; 676 677 /* 678 * Put all cards into the Sleep state so that we can clear 679 * their CSNs. 680 */ 681 pnp_send_initiation_key(); 682 683 /* 684 * Clear the CSN for all cards. 685 */ 686 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_RESET_CSN); 687 688 /* 689 * Move all cards to the Isolation state. 690 */ 691 pnp_write(PNP_WAKE, 0); 692 693 /* 694 * Tell them where the read point is going to be this time. 695 */ 696 pnp_write(PNP_SET_RD_DATA, pnp_rd_port); 697 698 for (csn = 1; csn < PNP_MAX_CARDS; csn++) { 699 /* 700 * Start the serial isolation protocol. 701 */ 702 outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION); 703 DELAY(1000); /* Delay 1 msec */ 704 705 if (pnp_get_serial(&id)) { 706 /* 707 * We have read the id from a card 708 * successfully. The card which won the 709 * isolation protocol will be in Isolation 710 * mode and all others will be in Sleep. 711 * Program the CSN of the isolated card 712 * (taking it to Config state) and read its 713 * resources, creating devices as we find 714 * logical devices on the card. 715 */ 716 pnp_write(PNP_SET_CSN, csn); 717 718 error = pnp_read_resources(&resources, 719 &space, 720 &len); 721 if (error) 722 break; 723 pnp_create_devices(parent, &id, csn, 724 resources, len); 725 found++; 726 } else 727 break; 728 729 /* 730 * Put this card back to the Sleep state and 731 * simultaneously move all cards which don't have a 732 * CSN yet to Isolation state. 733 */ 734 pnp_write(PNP_WAKE, 0); 735 } 736 737 /* 738 * Unless we have chosen the wrong read port, all cards will 739 * be in Sleep state. Put them back into WaitForKey for 740 * now. Their resources will be programmed later. 741 */ 742 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY); 743 744 /* 745 * Cleanup. 746 */ 747 if (resources) 748 kfree(resources, M_TEMP); 749 750 return found; 751 } 752 753 754 /* 755 * pnp_identify() 756 * 757 * autoconfiguration of pnp devices. This routine just runs the 758 * isolation protocol over several ports, until one is successful. 759 * 760 * may be called more than once ? 761 * 762 */ 763 static int 764 pnp_identify(driver_t *driver, device_t parent) 765 { 766 int num_pnp_devs; 767 768 /* 769 * We do not support rescanning PNP devices, just return 770 * success (leave the previously scanned devices intact). 771 */ 772 if (device_get_state(parent) == DS_ATTACHED) 773 return (0); 774 if (device_get_state(parent) == DS_INPROGRESS) 775 return (0); 776 777 #if 0 778 if (pnp_ldn_overrides[0].csn == 0) { 779 if (bootverbose) 780 kprintf("Initializing PnP override table\n"); 781 bzero (pnp_ldn_overrides, sizeof(pnp_ldn_overrides)); 782 pnp_ldn_overrides[0].csn = 255 ; 783 } 784 #endif 785 786 /* Try various READ_DATA ports from 0x203-0x3ff */ 787 for (pnp_rd_port = 0x80; (pnp_rd_port < 0xff); pnp_rd_port += 0x10) { 788 if (bootverbose) 789 kprintf("Trying Read_Port at %x\n", (pnp_rd_port << 2) | 0x3); 790 791 num_pnp_devs = pnp_isolation_protocol(parent); 792 if (num_pnp_devs) 793 break; 794 } 795 return (num_pnp_devs ? 0 : ENXIO); 796 } 797 798 /* 799 * This causes pnp_identify() to be called for any attached ISA bus in 800 * the system. 801 */ 802 static device_method_t pnp_methods[] = { 803 /* Device interface */ 804 DEVMETHOD(device_identify, pnp_identify), 805 806 { 0, 0 } 807 }; 808 809 static driver_t pnp_driver = { 810 "pnp", 811 pnp_methods, 812 1, /* no softc */ 813 }; 814 815 static devclass_t pnp_devclass; 816 817 DRIVER_MODULE(pnp, isa, pnp_driver, pnp_devclass, NULL, NULL); 818