pci.c revision 1.81
1 /* $NetBSD: pci.c,v 1.81 2003/08/15 07:17:21 itojun Exp $ */ 2 3 /* 4 * Copyright (c) 1995, 1996, 1997, 1998 5 * Christopher G. Demetriou. All rights reserved. 6 * Copyright (c) 1994 Charles M. Hannum. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Charles M. Hannum. 19 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 /* 35 * PCI bus autoconfiguration. 36 */ 37 38 #include <sys/cdefs.h> 39 __KERNEL_RCSID(0, "$NetBSD: pci.c,v 1.81 2003/08/15 07:17:21 itojun Exp $"); 40 41 #include "opt_pci.h" 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/device.h> 46 47 #include <dev/pci/pcireg.h> 48 #include <dev/pci/pcivar.h> 49 #include <dev/pci/pcidevs.h> 50 51 #include <uvm/uvm_extern.h> 52 53 #include "locators.h" 54 55 #ifdef PCI_CONFIG_DUMP 56 int pci_config_dump = 1; 57 #else 58 int pci_config_dump = 0; 59 #endif 60 61 int pcimatch __P((struct device *, struct cfdata *, void *)); 62 void pciattach __P((struct device *, struct device *, void *)); 63 64 CFATTACH_DECL(pci, sizeof(struct pci_softc), 65 pcimatch, pciattach, NULL, NULL); 66 67 int pciprint __P((void *, const char *)); 68 int pcisubmatch __P((struct device *, struct cfdata *, void *)); 69 70 /* 71 * Important note about PCI-ISA bridges: 72 * 73 * Callbacks are used to configure these devices so that ISA/EISA bridges 74 * can attach their child busses after PCI configuration is done. 75 * 76 * This works because: 77 * (1) there can be at most one ISA/EISA bridge per PCI bus, and 78 * (2) any ISA/EISA bridges must be attached to primary PCI 79 * busses (i.e. bus zero). 80 * 81 * That boils down to: there can only be one of these outstanding 82 * at a time, it is cleared when configuring PCI bus 0 before any 83 * subdevices have been found, and it is run after all subdevices 84 * of PCI bus 0 have been found. 85 * 86 * This is needed because there are some (legacy) PCI devices which 87 * can show up as ISA/EISA devices as well (the prime example of which 88 * are VGA controllers). If you attach ISA from a PCI-ISA/EISA bridge, 89 * and the bridge is seen before the video board is, the board can show 90 * up as an ISA device, and that can (bogusly) complicate the PCI device's 91 * attach code, or make the PCI device not be properly attached at all. 92 * 93 * We use the generic config_defer() facility to achieve this. 94 */ 95 96 int 97 pcimatch(parent, cf, aux) 98 struct device *parent; 99 struct cfdata *cf; 100 void *aux; 101 { 102 struct pcibus_attach_args *pba = aux; 103 104 if (strcmp(pba->pba_busname, cf->cf_name)) 105 return (0); 106 107 /* Check the locators */ 108 if (cf->pcibuscf_bus != PCIBUS_UNK_BUS && 109 cf->pcibuscf_bus != pba->pba_bus) 110 return (0); 111 112 /* sanity */ 113 if (pba->pba_bus < 0 || pba->pba_bus > 255) 114 return (0); 115 116 /* 117 * XXX check other (hardware?) indicators 118 */ 119 120 return (1); 121 } 122 123 void 124 pciattach(parent, self, aux) 125 struct device *parent, *self; 126 void *aux; 127 { 128 struct pcibus_attach_args *pba = aux; 129 struct pci_softc *sc = (struct pci_softc *)self; 130 int io_enabled, mem_enabled, mrl_enabled, mrm_enabled, mwi_enabled; 131 const char *sep = ""; 132 133 pci_attach_hook(parent, self, pba); 134 135 aprint_naive("\n"); 136 aprint_normal("\n"); 137 138 io_enabled = (pba->pba_flags & PCI_FLAGS_IO_ENABLED); 139 mem_enabled = (pba->pba_flags & PCI_FLAGS_MEM_ENABLED); 140 mrl_enabled = (pba->pba_flags & PCI_FLAGS_MRL_OKAY); 141 mrm_enabled = (pba->pba_flags & PCI_FLAGS_MRM_OKAY); 142 mwi_enabled = (pba->pba_flags & PCI_FLAGS_MWI_OKAY); 143 144 if (io_enabled == 0 && mem_enabled == 0) { 145 aprint_error("%s: no spaces enabled!\n", self->dv_xname); 146 return; 147 } 148 149 #define PRINT(str) \ 150 do { \ 151 aprint_normal("%s%s", sep, str); \ 152 sep = ", "; \ 153 } while (/*CONSTCOND*/0) 154 155 aprint_normal("%s: ", self->dv_xname); 156 157 if (io_enabled) 158 PRINT("i/o space"); 159 if (mem_enabled) 160 PRINT("memory space"); 161 aprint_normal(" enabled"); 162 163 if (mrl_enabled || mrm_enabled || mwi_enabled) { 164 if (mrl_enabled) 165 PRINT("rd/line"); 166 if (mrm_enabled) 167 PRINT("rd/mult"); 168 if (mwi_enabled) 169 PRINT("wr/inv"); 170 aprint_normal(" ok"); 171 } 172 173 aprint_normal("\n"); 174 175 #undef PRINT 176 177 sc->sc_iot = pba->pba_iot; 178 sc->sc_memt = pba->pba_memt; 179 sc->sc_dmat = pba->pba_dmat; 180 sc->sc_dmat64 = pba->pba_dmat64; 181 sc->sc_pc = pba->pba_pc; 182 sc->sc_bus = pba->pba_bus; 183 sc->sc_bridgetag = pba->pba_bridgetag; 184 sc->sc_maxndevs = pci_bus_maxdevs(pba->pba_pc, pba->pba_bus); 185 sc->sc_intrswiz = pba->pba_intrswiz; 186 sc->sc_intrtag = pba->pba_intrtag; 187 sc->sc_flags = pba->pba_flags; 188 pci_enumerate_bus(sc, NULL, NULL); 189 } 190 191 int 192 pciprint(aux, pnp) 193 void *aux; 194 const char *pnp; 195 { 196 struct pci_attach_args *pa = aux; 197 char devinfo[256]; 198 const struct pci_quirkdata *qd; 199 200 if (pnp) { 201 pci_devinfo(pa->pa_id, pa->pa_class, 1, devinfo); 202 aprint_normal("%s at %s", devinfo, pnp); 203 } 204 aprint_normal(" dev %d function %d", pa->pa_device, pa->pa_function); 205 if (pci_config_dump) { 206 printf(": "); 207 pci_conf_print(pa->pa_pc, pa->pa_tag, NULL); 208 if (!pnp) 209 pci_devinfo(pa->pa_id, pa->pa_class, 1, devinfo); 210 printf("%s at %s", devinfo, pnp ? pnp : "?"); 211 printf(" dev %d function %d (", pa->pa_device, pa->pa_function); 212 #ifdef __i386__ 213 printf("tag %#lx, intrtag %#lx, intrswiz %#lx, intrpin %#lx", 214 *(long *)&pa->pa_tag, *(long *)&pa->pa_intrtag, 215 (long)pa->pa_intrswiz, (long)pa->pa_intrpin); 216 #else 217 printf("intrswiz %#lx, intrpin %#lx", 218 (long)pa->pa_intrswiz, (long)pa->pa_intrpin); 219 #endif 220 printf(", i/o %s, mem %s,", 221 pa->pa_flags & PCI_FLAGS_IO_ENABLED ? "on" : "off", 222 pa->pa_flags & PCI_FLAGS_MEM_ENABLED ? "on" : "off"); 223 qd = pci_lookup_quirkdata(PCI_VENDOR(pa->pa_id), 224 PCI_PRODUCT(pa->pa_id)); 225 if (qd == NULL) { 226 printf(" no quirks"); 227 } else { 228 bitmask_snprintf(qd->quirks, 229 "\20\1multifn", devinfo, sizeof (devinfo)); 230 printf(" quirks %s", devinfo); 231 } 232 printf(")"); 233 } 234 return (UNCONF); 235 } 236 237 int 238 pcisubmatch(parent, cf, aux) 239 struct device *parent; 240 struct cfdata *cf; 241 void *aux; 242 { 243 struct pci_attach_args *pa = aux; 244 245 if (cf->pcicf_dev != PCI_UNK_DEV && 246 cf->pcicf_dev != pa->pa_device) 247 return (0); 248 if (cf->pcicf_function != PCI_UNK_FUNCTION && 249 cf->pcicf_function != pa->pa_function) 250 return (0); 251 return (config_match(parent, cf, aux)); 252 } 253 254 int 255 pci_probe_device(struct pci_softc *sc, pcitag_t tag, 256 int (*match)(struct pci_attach_args *), struct pci_attach_args *pap) 257 { 258 pci_chipset_tag_t pc = sc->sc_pc; 259 struct pci_attach_args pa; 260 pcireg_t id, csr, class, intr, bhlcr; 261 int ret, pin, bus, device, function; 262 263 pci_decompose_tag(pc, tag, &bus, &device, &function); 264 265 bhlcr = pci_conf_read(pc, tag, PCI_BHLC_REG); 266 if (PCI_HDRTYPE_TYPE(bhlcr) > 2) 267 return (0); 268 269 id = pci_conf_read(pc, tag, PCI_ID_REG); 270 csr = pci_conf_read(pc, tag, PCI_COMMAND_STATUS_REG); 271 class = pci_conf_read(pc, tag, PCI_CLASS_REG); 272 273 /* Invalid vendor ID value? */ 274 if (PCI_VENDOR(id) == PCI_VENDOR_INVALID) 275 return (0); 276 /* XXX Not invalid, but we've done this ~forever. */ 277 if (PCI_VENDOR(id) == 0) 278 return (0); 279 280 pa.pa_iot = sc->sc_iot; 281 pa.pa_memt = sc->sc_memt; 282 pa.pa_dmat = sc->sc_dmat; 283 pa.pa_dmat64 = sc->sc_dmat64; 284 pa.pa_pc = pc; 285 pa.pa_bus = bus; 286 pa.pa_device = device; 287 pa.pa_function = function; 288 pa.pa_tag = tag; 289 pa.pa_id = id; 290 pa.pa_class = class; 291 292 /* 293 * Set up memory, I/O enable, and PCI command flags 294 * as appropriate. 295 */ 296 pa.pa_flags = sc->sc_flags; 297 if ((csr & PCI_COMMAND_IO_ENABLE) == 0) 298 pa.pa_flags &= ~PCI_FLAGS_IO_ENABLED; 299 if ((csr & PCI_COMMAND_MEM_ENABLE) == 0) 300 pa.pa_flags &= ~PCI_FLAGS_MEM_ENABLED; 301 302 /* 303 * If the cache line size is not configured, then 304 * clear the MRL/MRM/MWI command-ok flags. 305 */ 306 if (PCI_CACHELINE(bhlcr) == 0) 307 pa.pa_flags &= ~(PCI_FLAGS_MRL_OKAY| 308 PCI_FLAGS_MRM_OKAY|PCI_FLAGS_MWI_OKAY); 309 310 if (sc->sc_bridgetag == NULL) { 311 pa.pa_intrswiz = 0; 312 pa.pa_intrtag = tag; 313 } else { 314 pa.pa_intrswiz = sc->sc_intrswiz + device; 315 pa.pa_intrtag = sc->sc_intrtag; 316 } 317 318 intr = pci_conf_read(pc, tag, PCI_INTERRUPT_REG); 319 320 pin = PCI_INTERRUPT_PIN(intr); 321 pa.pa_rawintrpin = pin; 322 if (pin == PCI_INTERRUPT_PIN_NONE) { 323 /* no interrupt */ 324 pa.pa_intrpin = 0; 325 } else { 326 /* 327 * swizzle it based on the number of busses we're 328 * behind and our device number. 329 */ 330 pa.pa_intrpin = /* XXX */ 331 ((pin + pa.pa_intrswiz - 1) % 4) + 1; 332 } 333 pa.pa_intrline = PCI_INTERRUPT_LINE(intr); 334 335 if (match != NULL) { 336 ret = (*match)(&pa); 337 if (ret != 0 && pap != NULL) 338 *pap = pa; 339 } else { 340 ret = config_found_sm(&sc->sc_dev, &pa, pciprint, 341 pcisubmatch) != NULL; 342 } 343 344 return (ret); 345 } 346 347 int 348 pci_get_capability(pc, tag, capid, offset, value) 349 pci_chipset_tag_t pc; 350 pcitag_t tag; 351 int capid; 352 int *offset; 353 pcireg_t *value; 354 { 355 pcireg_t reg; 356 unsigned int ofs; 357 358 reg = pci_conf_read(pc, tag, PCI_COMMAND_STATUS_REG); 359 if (!(reg & PCI_STATUS_CAPLIST_SUPPORT)) 360 return (0); 361 362 /* Determine the Capability List Pointer register to start with. */ 363 reg = pci_conf_read(pc, tag, PCI_BHLC_REG); 364 switch (PCI_HDRTYPE_TYPE(reg)) { 365 case 0: /* standard device header */ 366 ofs = PCI_CAPLISTPTR_REG; 367 break; 368 case 2: /* PCI-CardBus Bridge header */ 369 ofs = PCI_CARDBUS_CAPLISTPTR_REG; 370 break; 371 default: 372 return (0); 373 } 374 375 ofs = PCI_CAPLIST_PTR(pci_conf_read(pc, tag, ofs)); 376 while (ofs != 0) { 377 #ifdef DIAGNOSTIC 378 if ((ofs & 3) || (ofs < 0x40)) 379 panic("pci_get_capability"); 380 #endif 381 reg = pci_conf_read(pc, tag, ofs); 382 if (PCI_CAPLIST_CAP(reg) == capid) { 383 if (offset) 384 *offset = ofs; 385 if (value) 386 *value = reg; 387 return (1); 388 } 389 ofs = PCI_CAPLIST_NEXT(reg); 390 } 391 392 return (0); 393 } 394 395 int 396 pci_find_device(struct pci_attach_args *pa, 397 int (*match)(struct pci_attach_args *)) 398 { 399 extern struct cfdriver pci_cd; 400 struct device *pcidev; 401 int i; 402 403 for (i = 0; i < pci_cd.cd_ndevs; i++) { 404 pcidev = pci_cd.cd_devs[i]; 405 if (pcidev != NULL && 406 pci_enumerate_bus((struct pci_softc *) pcidev, 407 match, pa) != 0) 408 return (1); 409 } 410 return (0); 411 } 412 413 /* 414 * Generic PCI bus enumeration routine. Used unless machine-dependent 415 * code needs to provide something else. 416 */ 417 int 418 pci_enumerate_bus_generic(struct pci_softc *sc, 419 int (*match)(struct pci_attach_args *), struct pci_attach_args *pap) 420 { 421 pci_chipset_tag_t pc = sc->sc_pc; 422 int device, function, nfunctions, ret; 423 const struct pci_quirkdata *qd; 424 pcireg_t id, bhlcr; 425 pcitag_t tag; 426 #ifdef __PCI_BUS_DEVORDER 427 char devs[32]; 428 int i; 429 #endif 430 431 #ifdef __PCI_BUS_DEVORDER 432 pci_bus_devorder(sc->sc_pc, sc->sc_bus, devs); 433 for (i = 0; (device = devs[i]) < 32 && device >= 0; i++) 434 #else 435 for (device = 0; device < sc->sc_maxndevs; device++) 436 #endif 437 { 438 tag = pci_make_tag(pc, sc->sc_bus, device, 0); 439 440 bhlcr = pci_conf_read(pc, tag, PCI_BHLC_REG); 441 if (PCI_HDRTYPE_TYPE(bhlcr) > 2) 442 continue; 443 444 id = pci_conf_read(pc, tag, PCI_ID_REG); 445 446 /* Invalid vendor ID value? */ 447 if (PCI_VENDOR(id) == PCI_VENDOR_INVALID) 448 continue; 449 /* XXX Not invalid, but we've done this ~forever. */ 450 if (PCI_VENDOR(id) == 0) 451 continue; 452 453 qd = pci_lookup_quirkdata(PCI_VENDOR(id), PCI_PRODUCT(id)); 454 455 if (qd != NULL && 456 (qd->quirks & PCI_QUIRK_MULTIFUNCTION) != 0) 457 nfunctions = 8; 458 else if (qd != NULL && 459 (qd->quirks & PCI_QUIRK_MONOFUNCTION) != 0) 460 nfunctions = 1; 461 else 462 nfunctions = PCI_HDRTYPE_MULTIFN(bhlcr) ? 8 : 1; 463 464 for (function = 0; function < nfunctions; function++) { 465 if (qd != NULL && 466 (qd->quirks & PCI_QUIRK_SKIP_FUNC(function)) != 0) 467 continue; 468 tag = pci_make_tag(pc, sc->sc_bus, device, function); 469 ret = pci_probe_device(sc, tag, match, pap); 470 if (match != NULL && ret != 0) 471 return (ret); 472 } 473 } 474 return (0); 475 } 476 477 /* 478 * Power Management Capability (Rev 2.2) 479 */ 480 481 int 482 pci_set_powerstate(pci_chipset_tag_t pc, pcitag_t tag, int newstate) 483 { 484 int offset; 485 pcireg_t value, cap, now; 486 487 if (!pci_get_capability(pc, tag, PCI_CAP_PWRMGMT, &offset, &value)) 488 return (EOPNOTSUPP); 489 490 cap = value >> 16; 491 value = pci_conf_read(pc, tag, offset + PCI_PMCSR); 492 now = value & PCI_PMCSR_STATE_MASK; 493 value &= ~PCI_PMCSR_STATE_MASK; 494 switch (newstate) { 495 case PCI_PWR_D0: 496 if (now == PCI_PMCSR_STATE_D0) 497 return (0); 498 value |= PCI_PMCSR_STATE_D0; 499 break; 500 case PCI_PWR_D1: 501 if (now == PCI_PMCSR_STATE_D1) 502 return (0); 503 if (now == PCI_PMCSR_STATE_D2 || now == PCI_PMCSR_STATE_D3) 504 return (EINVAL); 505 if (!(cap & PCI_PMCR_D1SUPP)) 506 return (EOPNOTSUPP); 507 value |= PCI_PMCSR_STATE_D1; 508 break; 509 case PCI_PWR_D2: 510 if (now == PCI_PMCSR_STATE_D2) 511 return (0); 512 if (now == PCI_PMCSR_STATE_D3) 513 return (EINVAL); 514 if (!(cap & PCI_PMCR_D2SUPP)) 515 return (EOPNOTSUPP); 516 value |= PCI_PMCSR_STATE_D2; 517 break; 518 case PCI_PWR_D3: 519 if (now == PCI_PMCSR_STATE_D3) 520 return (0); 521 value |= PCI_PMCSR_STATE_D3; 522 break; 523 default: 524 return (EINVAL); 525 } 526 pci_conf_write(pc, tag, offset + PCI_PMCSR, value); 527 DELAY(1000); 528 529 return (0); 530 } 531 532 int 533 pci_get_powerstate(pci_chipset_tag_t pc, pcitag_t tag) 534 { 535 int offset; 536 pcireg_t value; 537 538 if (!pci_get_capability(pc, tag, PCI_CAP_PWRMGMT, &offset, &value)) 539 return (PCI_PWR_D0); 540 value = pci_conf_read(pc, tag, offset + PCI_PMCSR); 541 value &= PCI_PMCSR_STATE_MASK; 542 switch (value) { 543 case PCI_PMCSR_STATE_D0: 544 return (PCI_PWR_D0); 545 case PCI_PMCSR_STATE_D1: 546 return (PCI_PWR_D1); 547 case PCI_PMCSR_STATE_D2: 548 return (PCI_PWR_D2); 549 case PCI_PMCSR_STATE_D3: 550 return (PCI_PWR_D3); 551 } 552 553 return (PCI_PWR_D0); 554 } 555 556 /* 557 * Vital Product Data (PCI 2.2) 558 */ 559 560 int 561 pci_vpd_read(pci_chipset_tag_t pc, pcitag_t tag, int offset, int count, 562 pcireg_t *data) 563 { 564 uint32_t reg; 565 int ofs, i, j; 566 567 KASSERT(data != NULL); 568 KASSERT((offset + count) < 0x7fff); 569 570 if (pci_get_capability(pc, tag, PCI_CAP_VPD, &ofs, ®) == 0) 571 return (1); 572 573 for (i = 0; i < count; offset += sizeof(*data), i++) { 574 reg &= 0x0000ffff; 575 reg &= ~PCI_VPD_OPFLAG; 576 reg |= PCI_VPD_ADDRESS(offset); 577 pci_conf_write(pc, tag, ofs, reg); 578 579 /* 580 * PCI 2.2 does not specify how long we should poll 581 * for completion nor whether the operation can fail. 582 */ 583 j = 0; 584 do { 585 if (j++ == 20) 586 return (1); 587 delay(4); 588 reg = pci_conf_read(pc, tag, ofs); 589 } while ((reg & PCI_VPD_OPFLAG) == 0); 590 data[i] = pci_conf_read(pc, tag, PCI_VPD_DATAREG(ofs)); 591 } 592 593 return (0); 594 } 595 596 int 597 pci_vpd_write(pci_chipset_tag_t pc, pcitag_t tag, int offset, int count, 598 pcireg_t *data) 599 { 600 pcireg_t reg; 601 int ofs, i, j; 602 603 KASSERT(data != NULL); 604 KASSERT((offset + count) < 0x7fff); 605 606 if (pci_get_capability(pc, tag, PCI_CAP_VPD, &ofs, ®) == 0) 607 return (1); 608 609 for (i = 0; i < count; offset += sizeof(*data), i++) { 610 pci_conf_write(pc, tag, PCI_VPD_DATAREG(ofs), data[i]); 611 612 reg &= 0x0000ffff; 613 reg |= PCI_VPD_OPFLAG; 614 reg |= PCI_VPD_ADDRESS(offset); 615 pci_conf_write(pc, tag, ofs, reg); 616 617 /* 618 * PCI 2.2 does not specify how long we should poll 619 * for completion nor whether the operation can fail. 620 */ 621 j = 0; 622 do { 623 if (j++ == 20) 624 return (1); 625 delay(1); 626 reg = pci_conf_read(pc, tag, ofs); 627 } while (reg & PCI_VPD_OPFLAG); 628 } 629 630 return (0); 631 } 632 633 int 634 pci_dma64_available(struct pci_attach_args *pa) 635 { 636 #ifdef _PCI_HAVE_DMA64 637 if (BUS_DMA_TAG_VALID(pa->pa_dmat64) && 638 ((uint64_t)physmem << PAGE_SHIFT) > 0xffffffffULL) 639 return 1; 640 #endif 641 return 0; 642 } 643
Indexes created Sun Sep 21 14:09:52 GMT 2025