1 /* 2 * Common pmac/prep/chrp pci routines. -- Cort 3 */ 4 5 #include <linux/kernel.h> 6 #include <linux/pci.h> 7 #include <linux/delay.h> 8 #include <linux/string.h> 9 #include <linux/init.h> 10 #include <linux/capability.h> 11 #include <linux/sched.h> 12 #include <linux/errno.h> 13 #include <linux/bootmem.h> 14 #include <linux/irq.h> 15 #include <linux/list.h> 16 #include <linux/of.h> 17 18 #include <asm/processor.h> 19 #include <asm/io.h> 20 #include <asm/prom.h> 21 #include <asm/sections.h> 22 #include <asm/pci-bridge.h> 23 #include <asm/byteorder.h> 24 #include <asm/uaccess.h> 25 #include <asm/machdep.h> 26 27 #undef DEBUG 28 29 #ifdef DEBUG 30 #define DBG(x...) printk(x) 31 #else 32 #define DBG(x...) 33 #endif 34 35 unsigned long isa_io_base = 0; 36 unsigned long pci_dram_offset = 0; 37 int pcibios_assign_bus_offset = 1; 38 39 void pcibios_make_OF_bus_map(void); 40 41 static void fixup_broken_pcnet32(struct pci_dev* dev); 42 static void fixup_cpc710_pci64(struct pci_dev* dev); 43 #ifdef CONFIG_PPC_OF 44 static u8* pci_to_OF_bus_map; 45 #endif 46 47 /* By default, we don't re-assign bus numbers. We do this only on 48 * some pmacs 49 */ 50 static int pci_assign_all_buses; 51 52 LIST_HEAD(hose_list); 53 54 static int pci_bus_count; 55 56 static void 57 fixup_hide_host_resource_fsl(struct pci_dev* dev) 58 { 59 int i, class = dev->class >> 8; 60 61 if ((class == PCI_CLASS_PROCESSOR_POWERPC) && 62 (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) && 63 (dev->bus->parent == NULL)) { 64 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { 65 dev->resource[i].start = 0; 66 dev->resource[i].end = 0; 67 dev->resource[i].flags = 0; 68 } 69 } 70 } 71 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MOTOROLA, PCI_ANY_ID, fixup_hide_host_resource_fsl); 72 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, fixup_hide_host_resource_fsl); 73 74 static void 75 fixup_broken_pcnet32(struct pci_dev* dev) 76 { 77 if ((dev->class>>8 == PCI_CLASS_NETWORK_ETHERNET)) { 78 dev->vendor = PCI_VENDOR_ID_AMD; 79 pci_write_config_word(dev, PCI_VENDOR_ID, PCI_VENDOR_ID_AMD); 80 } 81 } 82 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_TRIDENT, PCI_ANY_ID, fixup_broken_pcnet32); 83 84 static void 85 fixup_cpc710_pci64(struct pci_dev* dev) 86 { 87 /* Hide the PCI64 BARs from the kernel as their content doesn't 88 * fit well in the resource management 89 */ 90 dev->resource[0].start = dev->resource[0].end = 0; 91 dev->resource[0].flags = 0; 92 dev->resource[1].start = dev->resource[1].end = 0; 93 dev->resource[1].flags = 0; 94 } 95 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64); 96 97 #ifdef CONFIG_PPC_OF 98 /* 99 * Functions below are used on OpenFirmware machines. 100 */ 101 static void 102 make_one_node_map(struct device_node* node, u8 pci_bus) 103 { 104 const int *bus_range; 105 int len; 106 107 if (pci_bus >= pci_bus_count) 108 return; 109 bus_range = of_get_property(node, "bus-range", &len); 110 if (bus_range == NULL || len < 2 * sizeof(int)) { 111 printk(KERN_WARNING "Can't get bus-range for %s, " 112 "assuming it starts at 0\n", node->full_name); 113 pci_to_OF_bus_map[pci_bus] = 0; 114 } else 115 pci_to_OF_bus_map[pci_bus] = bus_range[0]; 116 117 for_each_child_of_node(node, node) { 118 struct pci_dev* dev; 119 const unsigned int *class_code, *reg; 120 121 class_code = of_get_property(node, "class-code", NULL); 122 if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI && 123 (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) 124 continue; 125 reg = of_get_property(node, "reg", NULL); 126 if (!reg) 127 continue; 128 dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff)); 129 if (!dev || !dev->subordinate) { 130 pci_dev_put(dev); 131 continue; 132 } 133 make_one_node_map(node, dev->subordinate->number); 134 pci_dev_put(dev); 135 } 136 } 137 138 void 139 pcibios_make_OF_bus_map(void) 140 { 141 int i; 142 struct pci_controller *hose, *tmp; 143 struct property *map_prop; 144 struct device_node *dn; 145 146 pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL); 147 if (!pci_to_OF_bus_map) { 148 printk(KERN_ERR "Can't allocate OF bus map !\n"); 149 return; 150 } 151 152 /* We fill the bus map with invalid values, that helps 153 * debugging. 154 */ 155 for (i=0; i<pci_bus_count; i++) 156 pci_to_OF_bus_map[i] = 0xff; 157 158 /* For each hose, we begin searching bridges */ 159 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { 160 struct device_node* node = hose->dn; 161 162 if (!node) 163 continue; 164 make_one_node_map(node, hose->first_busno); 165 } 166 dn = of_find_node_by_path("/"); 167 map_prop = of_find_property(dn, "pci-OF-bus-map", NULL); 168 if (map_prop) { 169 BUG_ON(pci_bus_count > map_prop->length); 170 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count); 171 } 172 of_node_put(dn); 173 #ifdef DEBUG 174 printk("PCI->OF bus map:\n"); 175 for (i=0; i<pci_bus_count; i++) { 176 if (pci_to_OF_bus_map[i] == 0xff) 177 continue; 178 printk("%d -> %d\n", i, pci_to_OF_bus_map[i]); 179 } 180 #endif 181 } 182 183 typedef int (*pci_OF_scan_iterator)(struct device_node* node, void* data); 184 185 static struct device_node* 186 scan_OF_pci_childs(struct device_node *parent, pci_OF_scan_iterator filter, void* data) 187 { 188 struct device_node *node; 189 struct device_node* sub_node; 190 191 for_each_child_of_node(parent, node) { 192 const unsigned int *class_code; 193 194 if (filter(node, data)) { 195 of_node_put(node); 196 return node; 197 } 198 199 /* For PCI<->PCI bridges or CardBus bridges, we go down 200 * Note: some OFs create a parent node "multifunc-device" as 201 * a fake root for all functions of a multi-function device, 202 * we go down them as well. 203 */ 204 class_code = of_get_property(node, "class-code", NULL); 205 if ((!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI && 206 (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) && 207 strcmp(node->name, "multifunc-device")) 208 continue; 209 sub_node = scan_OF_pci_childs(node, filter, data); 210 if (sub_node) { 211 of_node_put(node); 212 return sub_node; 213 } 214 } 215 return NULL; 216 } 217 218 static struct device_node *scan_OF_for_pci_dev(struct device_node *parent, 219 unsigned int devfn) 220 { 221 struct device_node *np; 222 const u32 *reg; 223 unsigned int psize; 224 225 for_each_child_of_node(parent, np) { 226 reg = of_get_property(np, "reg", &psize); 227 if (reg == NULL || psize < 4) 228 continue; 229 if (((reg[0] >> 8) & 0xff) == devfn) 230 return np; 231 } 232 return NULL; 233 } 234 235 236 static struct device_node *scan_OF_for_pci_bus(struct pci_bus *bus) 237 { 238 struct device_node *parent, *np; 239 240 /* Are we a root bus ? */ 241 if (bus->self == NULL || bus->parent == NULL) { 242 struct pci_controller *hose = pci_bus_to_host(bus); 243 if (hose == NULL) 244 return NULL; 245 return of_node_get(hose->dn); 246 } 247 248 /* not a root bus, we need to get our parent */ 249 parent = scan_OF_for_pci_bus(bus->parent); 250 if (parent == NULL) 251 return NULL; 252 253 /* now iterate for children for a match */ 254 np = scan_OF_for_pci_dev(parent, bus->self->devfn); 255 of_node_put(parent); 256 257 return np; 258 } 259 260 /* 261 * Scans the OF tree for a device node matching a PCI device 262 */ 263 struct device_node * 264 pci_busdev_to_OF_node(struct pci_bus *bus, int devfn) 265 { 266 struct device_node *parent, *np; 267 268 if (!have_of) 269 return NULL; 270 271 DBG("pci_busdev_to_OF_node(%d,0x%x)\n", bus->number, devfn); 272 parent = scan_OF_for_pci_bus(bus); 273 if (parent == NULL) 274 return NULL; 275 DBG(" parent is %s\n", parent ? parent->full_name : "<NULL>"); 276 np = scan_OF_for_pci_dev(parent, devfn); 277 of_node_put(parent); 278 DBG(" result is %s\n", np ? np->full_name : "<NULL>"); 279 280 /* XXX most callers don't release the returned node 281 * mostly because ppc64 doesn't increase the refcount, 282 * we need to fix that. 283 */ 284 return np; 285 } 286 EXPORT_SYMBOL(pci_busdev_to_OF_node); 287 288 struct device_node* 289 pci_device_to_OF_node(struct pci_dev *dev) 290 { 291 return pci_busdev_to_OF_node(dev->bus, dev->devfn); 292 } 293 EXPORT_SYMBOL(pci_device_to_OF_node); 294 295 static int 296 find_OF_pci_device_filter(struct device_node* node, void* data) 297 { 298 return ((void *)node == data); 299 } 300 301 /* 302 * Returns the PCI device matching a given OF node 303 */ 304 int 305 pci_device_from_OF_node(struct device_node* node, u8* bus, u8* devfn) 306 { 307 const unsigned int *reg; 308 struct pci_controller* hose; 309 struct pci_dev* dev = NULL; 310 311 if (!have_of) 312 return -ENODEV; 313 /* Make sure it's really a PCI device */ 314 hose = pci_find_hose_for_OF_device(node); 315 if (!hose || !hose->dn) 316 return -ENODEV; 317 if (!scan_OF_pci_childs(hose->dn, 318 find_OF_pci_device_filter, (void *)node)) 319 return -ENODEV; 320 reg = of_get_property(node, "reg", NULL); 321 if (!reg) 322 return -ENODEV; 323 *bus = (reg[0] >> 16) & 0xff; 324 *devfn = ((reg[0] >> 8) & 0xff); 325 326 /* Ok, here we need some tweak. If we have already renumbered 327 * all busses, we can't rely on the OF bus number any more. 328 * the pci_to_OF_bus_map is not enough as several PCI busses 329 * may match the same OF bus number. 330 */ 331 if (!pci_to_OF_bus_map) 332 return 0; 333 334 for_each_pci_dev(dev) 335 if (pci_to_OF_bus_map[dev->bus->number] == *bus && 336 dev->devfn == *devfn) { 337 *bus = dev->bus->number; 338 pci_dev_put(dev); 339 return 0; 340 } 341 342 return -ENODEV; 343 } 344 EXPORT_SYMBOL(pci_device_from_OF_node); 345 346 /* We create the "pci-OF-bus-map" property now so it appears in the 347 * /proc device tree 348 */ 349 void __init 350 pci_create_OF_bus_map(void) 351 { 352 struct property* of_prop; 353 struct device_node *dn; 354 355 of_prop = (struct property*) alloc_bootmem(sizeof(struct property) + 256); 356 if (!of_prop) 357 return; 358 dn = of_find_node_by_path("/"); 359 if (dn) { 360 memset(of_prop, -1, sizeof(struct property) + 256); 361 of_prop->name = "pci-OF-bus-map"; 362 of_prop->length = 256; 363 of_prop->value = &of_prop[1]; 364 prom_add_property(dn, of_prop); 365 of_node_put(dn); 366 } 367 } 368 369 #else /* CONFIG_PPC_OF */ 370 void pcibios_make_OF_bus_map(void) 371 { 372 } 373 #endif /* CONFIG_PPC_OF */ 374 375 static int __init pcibios_init(void) 376 { 377 struct pci_controller *hose, *tmp; 378 struct pci_bus *bus; 379 int next_busno = 0; 380 381 printk(KERN_INFO "PCI: Probing PCI hardware\n"); 382 383 if (ppc_pci_flags & PPC_PCI_REASSIGN_ALL_BUS) 384 pci_assign_all_buses = 1; 385 386 /* Scan all of the recorded PCI controllers. */ 387 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { 388 if (pci_assign_all_buses) 389 hose->first_busno = next_busno; 390 hose->last_busno = 0xff; 391 bus = pci_scan_bus_parented(hose->parent, hose->first_busno, 392 hose->ops, hose); 393 if (bus) { 394 pci_bus_add_devices(bus); 395 hose->last_busno = bus->subordinate; 396 } 397 if (pci_assign_all_buses || next_busno <= hose->last_busno) 398 next_busno = hose->last_busno + pcibios_assign_bus_offset; 399 } 400 pci_bus_count = next_busno; 401 402 /* OpenFirmware based machines need a map of OF bus 403 * numbers vs. kernel bus numbers since we may have to 404 * remap them. 405 */ 406 if (pci_assign_all_buses && have_of) 407 pcibios_make_OF_bus_map(); 408 409 /* Call common code to handle resource allocation */ 410 pcibios_resource_survey(); 411 412 /* Call machine dependent post-init code */ 413 if (ppc_md.pcibios_after_init) 414 ppc_md.pcibios_after_init(); 415 416 return 0; 417 } 418 419 subsys_initcall(pcibios_init); 420 421 void __devinit pcibios_do_bus_setup(struct pci_bus *bus) 422 { 423 struct pci_controller *hose = (struct pci_controller *) bus->sysdata; 424 unsigned long io_offset; 425 struct resource *res; 426 int i; 427 428 /* Hookup PHB resources */ 429 io_offset = (unsigned long)hose->io_base_virt - isa_io_base; 430 if (bus->parent == NULL) { 431 /* This is a host bridge - fill in its resources */ 432 hose->bus = bus; 433 434 bus->resource[0] = res = &hose->io_resource; 435 if (!res->flags) { 436 if (io_offset) 437 printk(KERN_ERR "I/O resource not set for host" 438 " bridge %d\n", hose->global_number); 439 res->start = 0; 440 res->end = IO_SPACE_LIMIT; 441 res->flags = IORESOURCE_IO; 442 } 443 res->start = (res->start + io_offset) & 0xffffffffu; 444 res->end = (res->end + io_offset) & 0xffffffffu; 445 446 for (i = 0; i < 3; ++i) { 447 res = &hose->mem_resources[i]; 448 if (!res->flags) { 449 if (i > 0) 450 continue; 451 printk(KERN_ERR "Memory resource not set for " 452 "host bridge %d\n", hose->global_number); 453 res->start = hose->pci_mem_offset; 454 res->end = ~0U; 455 res->flags = IORESOURCE_MEM; 456 } 457 bus->resource[i+1] = res; 458 } 459 } 460 } 461 462 /* the next one is stolen from the alpha port... */ 463 void __init 464 pcibios_update_irq(struct pci_dev *dev, int irq) 465 { 466 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq); 467 /* XXX FIXME - update OF device tree node interrupt property */ 468 } 469 470 static struct pci_controller* 471 pci_bus_to_hose(int bus) 472 { 473 struct pci_controller *hose, *tmp; 474 475 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) 476 if (bus >= hose->first_busno && bus <= hose->last_busno) 477 return hose; 478 return NULL; 479 } 480 481 /* Provide information on locations of various I/O regions in physical 482 * memory. Do this on a per-card basis so that we choose the right 483 * root bridge. 484 * Note that the returned IO or memory base is a physical address 485 */ 486 487 long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn) 488 { 489 struct pci_controller* hose; 490 long result = -EOPNOTSUPP; 491 492 hose = pci_bus_to_hose(bus); 493 if (!hose) 494 return -ENODEV; 495 496 switch (which) { 497 case IOBASE_BRIDGE_NUMBER: 498 return (long)hose->first_busno; 499 case IOBASE_MEMORY: 500 return (long)hose->pci_mem_offset; 501 case IOBASE_IO: 502 return (long)hose->io_base_phys; 503 case IOBASE_ISA_IO: 504 return (long)isa_io_base; 505 case IOBASE_ISA_MEM: 506 return (long)isa_mem_base; 507 } 508 509 return result; 510 } 511 512 unsigned long pci_address_to_pio(phys_addr_t address) 513 { 514 struct pci_controller *hose, *tmp; 515 516 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { 517 unsigned int size = hose->io_resource.end - 518 hose->io_resource.start + 1; 519 if (address >= hose->io_base_phys && 520 address < (hose->io_base_phys + size)) { 521 unsigned long base = 522 (unsigned long)hose->io_base_virt - _IO_BASE; 523 return base + (address - hose->io_base_phys); 524 } 525 } 526 return (unsigned int)-1; 527 } 528 EXPORT_SYMBOL(pci_address_to_pio); 529 530 /* 531 * Null PCI config access functions, for the case when we can't 532 * find a hose. 533 */ 534 #define NULL_PCI_OP(rw, size, type) \ 535 static int \ 536 null_##rw##_config_##size(struct pci_dev *dev, int offset, type val) \ 537 { \ 538 return PCIBIOS_DEVICE_NOT_FOUND; \ 539 } 540 541 static int 542 null_read_config(struct pci_bus *bus, unsigned int devfn, int offset, 543 int len, u32 *val) 544 { 545 return PCIBIOS_DEVICE_NOT_FOUND; 546 } 547 548 static int 549 null_write_config(struct pci_bus *bus, unsigned int devfn, int offset, 550 int len, u32 val) 551 { 552 return PCIBIOS_DEVICE_NOT_FOUND; 553 } 554 555 static struct pci_ops null_pci_ops = 556 { 557 .read = null_read_config, 558 .write = null_write_config, 559 }; 560 561 /* 562 * These functions are used early on before PCI scanning is done 563 * and all of the pci_dev and pci_bus structures have been created. 564 */ 565 static struct pci_bus * 566 fake_pci_bus(struct pci_controller *hose, int busnr) 567 { 568 static struct pci_bus bus; 569 570 if (hose == 0) { 571 hose = pci_bus_to_hose(busnr); 572 if (hose == 0) 573 printk(KERN_ERR "Can't find hose for PCI bus %d!\n", busnr); 574 } 575 bus.number = busnr; 576 bus.sysdata = hose; 577 bus.ops = hose? hose->ops: &null_pci_ops; 578 return &bus; 579 } 580 581 #define EARLY_PCI_OP(rw, size, type) \ 582 int early_##rw##_config_##size(struct pci_controller *hose, int bus, \ 583 int devfn, int offset, type value) \ 584 { \ 585 return pci_bus_##rw##_config_##size(fake_pci_bus(hose, bus), \ 586 devfn, offset, value); \ 587 } 588 589 EARLY_PCI_OP(read, byte, u8 *) 590 EARLY_PCI_OP(read, word, u16 *) 591 EARLY_PCI_OP(read, dword, u32 *) 592 EARLY_PCI_OP(write, byte, u8) 593 EARLY_PCI_OP(write, word, u16) 594 EARLY_PCI_OP(write, dword, u32) 595 596 extern int pci_bus_find_capability (struct pci_bus *bus, unsigned int devfn, int cap); 597 int early_find_capability(struct pci_controller *hose, int bus, int devfn, 598 int cap) 599 { 600 return pci_bus_find_capability(fake_pci_bus(hose, bus), devfn, cap); 601 } 602