arch/powerpc/kernel/pci_32.c

   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
  98 void __init
  99 update_bridge_resource(struct pci_dev *dev, struct resource *res)
 100 {
 101         u8 io_base_lo, io_limit_lo;
 102         u16 mem_base, mem_limit;
 103         u16 cmd;
 104         resource_size_t start, end, off;
 105         struct pci_controller *hose = dev->sysdata;
 106
 107         if (!hose) {
 108                 printk("update_bridge_base: no hose?\n");
 109                 return;
 110         }
 111         pci_read_config_word(dev, PCI_COMMAND, &cmd);
 112         pci_write_config_word(dev, PCI_COMMAND,
 113                               cmd & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY));
 114         if (res->flags & IORESOURCE_IO) {
 115                 off = (unsigned long) hose->io_base_virt - isa_io_base;
 116                 start = res->start - off;
 117                 end = res->end - off;
 118                 io_base_lo = (start >> 8) & PCI_IO_RANGE_MASK;
 119                 io_limit_lo = (end >> 8) & PCI_IO_RANGE_MASK;
 120                 if (end > 0xffff)
 121                         io_base_lo |= PCI_IO_RANGE_TYPE_32;
 122                 else
 123                         io_base_lo |= PCI_IO_RANGE_TYPE_16;
 124                 pci_write_config_word(dev, PCI_IO_BASE_UPPER16,
 125                                 start >> 16);
 126                 pci_write_config_word(dev, PCI_IO_LIMIT_UPPER16,
 127                                 end >> 16);
 128                 pci_write_config_byte(dev, PCI_IO_BASE, io_base_lo);
 129                 pci_write_config_byte(dev, PCI_IO_LIMIT, io_limit_lo);
 130
 131         } else if ((res->flags & (IORESOURCE_MEM | IORESOURCE_PREFETCH))
 132                    == IORESOURCE_MEM) {
 133                 off = hose->pci_mem_offset;
 134                 mem_base = ((res->start - off) >> 16) & PCI_MEMORY_RANGE_MASK;
 135                 mem_limit = ((res->end - off) >> 16) & PCI_MEMORY_RANGE_MASK;
 136                 pci_write_config_word(dev, PCI_MEMORY_BASE, mem_base);
 137                 pci_write_config_word(dev, PCI_MEMORY_LIMIT, mem_limit);
 138
 139         } else if ((res->flags & (IORESOURCE_MEM | IORESOURCE_PREFETCH))
 140                    == (IORESOURCE_MEM | IORESOURCE_PREFETCH)) {
 141                 off = hose->pci_mem_offset;
 142                 mem_base = ((res->start - off) >> 16) & PCI_PREF_RANGE_MASK;
 143                 mem_limit = ((res->end - off) >> 16) & PCI_PREF_RANGE_MASK;
 144                 pci_write_config_word(dev, PCI_PREF_MEMORY_BASE, mem_base);
 145                 pci_write_config_word(dev, PCI_PREF_MEMORY_LIMIT, mem_limit);
 146
 147         } else {
 148                 DBG(KERN_ERR "PCI: ugh, bridge %s res has flags=%lx\n",
 149                     pci_name(dev), res->flags);
 150         }
 151         pci_write_config_word(dev, PCI_COMMAND, cmd);
 152 }
 153
 154
 155 #ifdef CONFIG_PPC_OF
 156 /*
 157  * Functions below are used on OpenFirmware machines.
 158  */
 159 static void
 160 make_one_node_map(struct device_node* node, u8 pci_bus)
 161 {
 162         const int *bus_range;
 163         int len;
 164
 165         if (pci_bus >= pci_bus_count)
 166                 return;
 167         bus_range = of_get_property(node, "bus-range", &len);
 168         if (bus_range == NULL || len < 2 * sizeof(int)) {
 169                 printk(KERN_WARNING "Can't get bus-range for %s, "
 170                        "assuming it starts at 0\n", node->full_name);
 171                 pci_to_OF_bus_map[pci_bus] = 0;
 172         } else
 173                 pci_to_OF_bus_map[pci_bus] = bus_range[0];
 174
 175         for_each_child_of_node(node, node) {
 176                 struct pci_dev* dev;
 177                 const unsigned int *class_code, *reg;
 178
 179                 class_code = of_get_property(node, "class-code", NULL);
 180                 if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
 181                         (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
 182                         continue;
 183                 reg = of_get_property(node, "reg", NULL);
 184                 if (!reg)
 185                         continue;
 186                 dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff));
 187                 if (!dev || !dev->subordinate) {
 188                         pci_dev_put(dev);
 189                         continue;
 190                 }
 191                 make_one_node_map(node, dev->subordinate->number);
 192                 pci_dev_put(dev);
 193         }
 194 }
 195
 196 void
 197 pcibios_make_OF_bus_map(void)
 198 {
 199         int i;
 200         struct pci_controller *hose, *tmp;
 201         struct property *map_prop;
 202         struct device_node *dn;
 203
 204         pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
 205         if (!pci_to_OF_bus_map) {
 206                 printk(KERN_ERR "Can't allocate OF bus map !\n");
 207                 return;
 208         }
 209
 210         /* We fill the bus map with invalid values, that helps
 211          * debugging.
 212          */
 213         for (i=0; i<pci_bus_count; i++)
 214                 pci_to_OF_bus_map[i] = 0xff;
 215
 216         /* For each hose, we begin searching bridges */
 217         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 218                 struct device_node* node = hose->dn;
 219
 220                 if (!node)
 221                         continue;
 222                 make_one_node_map(node, hose->first_busno);
 223         }
 224         dn = of_find_node_by_path("/");
 225         map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
 226         if (map_prop) {
 227                 BUG_ON(pci_bus_count > map_prop->length);
 228                 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
 229         }
 230         of_node_put(dn);
 231 #ifdef DEBUG
 232         printk("PCI->OF bus map:\n");
 233         for (i=0; i<pci_bus_count; i++) {
 234                 if (pci_to_OF_bus_map[i] == 0xff)
 235                         continue;
 236                 printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
 237         }
 238 #endif
 239 }
 240
 241 typedef int (*pci_OF_scan_iterator)(struct device_node* node, void* data);
 242
 243 static struct device_node*
 244 scan_OF_pci_childs(struct device_node *parent, pci_OF_scan_iterator filter, void* data)
 245 {
 246         struct device_node *node;
 247         struct device_node* sub_node;
 248
 249         for_each_child_of_node(parent, node) {
 250                 const unsigned int *class_code;
 251
 252                 if (filter(node, data)) {
 253                         of_node_put(node);
 254                         return node;
 255                 }
 256
 257                 /* For PCI<->PCI bridges or CardBus bridges, we go down
 258                  * Note: some OFs create a parent node "multifunc-device" as
 259                  * a fake root for all functions of a multi-function device,
 260                  * we go down them as well.
 261                  */
 262                 class_code = of_get_property(node, "class-code", NULL);
 263                 if ((!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
 264                         (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) &&
 265                         strcmp(node->name, "multifunc-device"))
 266                         continue;
 267                 sub_node = scan_OF_pci_childs(node, filter, data);
 268                 if (sub_node) {
 269                         of_node_put(node);
 270                         return sub_node;
 271                 }
 272         }
 273         return NULL;
 274 }
 275
 276 static struct device_node *scan_OF_for_pci_dev(struct device_node *parent,
 277                                                unsigned int devfn)
 278 {
 279         struct device_node *np;
 280         const u32 *reg;
 281         unsigned int psize;
 282
 283         for_each_child_of_node(parent, np) {
 284                 reg = of_get_property(np, "reg", &psize);
 285                 if (reg == NULL || psize < 4)
 286                         continue;
 287                 if (((reg[0] >> 8) & 0xff) == devfn)
 288                         return np;
 289         }
 290         return NULL;
 291 }
 292
 293
 294 static struct device_node *scan_OF_for_pci_bus(struct pci_bus *bus)
 295 {
 296         struct device_node *parent, *np;
 297
 298         /* Are we a root bus ? */
 299         if (bus->self == NULL || bus->parent == NULL) {
 300                 struct pci_controller *hose = pci_bus_to_host(bus);
 301                 if (hose == NULL)
 302                         return NULL;
 303                 return of_node_get(hose->dn);
 304         }
 305
 306         /* not a root bus, we need to get our parent */
 307         parent = scan_OF_for_pci_bus(bus->parent);
 308         if (parent == NULL)
 309                 return NULL;
 310
 311         /* now iterate for children for a match */
 312         np = scan_OF_for_pci_dev(parent, bus->self->devfn);
 313         of_node_put(parent);
 314
 315         return np;
 316 }
 317
 318 /*
 319  * Scans the OF tree for a device node matching a PCI device
 320  */
 321 struct device_node *
 322 pci_busdev_to_OF_node(struct pci_bus *bus, int devfn)
 323 {
 324         struct device_node *parent, *np;
 325
 326         if (!have_of)
 327                 return NULL;
 328
 329         DBG("pci_busdev_to_OF_node(%d,0x%x)\n", bus->number, devfn);
 330         parent = scan_OF_for_pci_bus(bus);
 331         if (parent == NULL)
 332                 return NULL;
 333         DBG(" parent is %s\n", parent ? parent->full_name : "<NULL>");
 334         np = scan_OF_for_pci_dev(parent, devfn);
 335         of_node_put(parent);
 336         DBG(" result is %s\n", np ? np->full_name : "<NULL>");
 337
 338         /* XXX most callers don't release the returned node
 339          * mostly because ppc64 doesn't increase the refcount,
 340          * we need to fix that.
 341          */
 342         return np;
 343 }
 344 EXPORT_SYMBOL(pci_busdev_to_OF_node);
 345
 346 struct device_node*
 347 pci_device_to_OF_node(struct pci_dev *dev)
 348 {
 349         return pci_busdev_to_OF_node(dev->bus, dev->devfn);
 350 }
 351 EXPORT_SYMBOL(pci_device_to_OF_node);
 352
 353 static int
 354 find_OF_pci_device_filter(struct device_node* node, void* data)
 355 {
 356         return ((void *)node == data);
 357 }
 358
 359 /*
 360  * Returns the PCI device matching a given OF node
 361  */
 362 int
 363 pci_device_from_OF_node(struct device_node* node, u8* bus, u8* devfn)
 364 {
 365         const unsigned int *reg;
 366         struct pci_controller* hose;
 367         struct pci_dev* dev = NULL;
 368
 369         if (!have_of)
 370                 return -ENODEV;
 371         /* Make sure it's really a PCI device */
 372         hose = pci_find_hose_for_OF_device(node);
 373         if (!hose || !hose->dn)
 374                 return -ENODEV;
 375         if (!scan_OF_pci_childs(hose->dn,
 376                         find_OF_pci_device_filter, (void *)node))
 377                 return -ENODEV;
 378         reg = of_get_property(node, "reg", NULL);
 379         if (!reg)
 380                 return -ENODEV;
 381         *bus = (reg[0] >> 16) & 0xff;
 382         *devfn = ((reg[0] >> 8) & 0xff);
 383
 384         /* Ok, here we need some tweak. If we have already renumbered
 385          * all busses, we can't rely on the OF bus number any more.
 386          * the pci_to_OF_bus_map is not enough as several PCI busses
 387          * may match the same OF bus number.
 388          */
 389         if (!pci_to_OF_bus_map)
 390                 return 0;
 391
 392         for_each_pci_dev(dev)
 393                 if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
 394                                 dev->devfn == *devfn) {
 395                         *bus = dev->bus->number;
 396                         pci_dev_put(dev);
 397                         return 0;
 398                 }
 399
 400         return -ENODEV;
 401 }
 402 EXPORT_SYMBOL(pci_device_from_OF_node);
 403
 404 /* We create the "pci-OF-bus-map" property now so it appears in the
 405  * /proc device tree
 406  */
 407 void __init
 408 pci_create_OF_bus_map(void)
 409 {
 410         struct property* of_prop;
 411         struct device_node *dn;
 412
 413         of_prop = (struct property*) alloc_bootmem(sizeof(struct property) + 256);
 414         if (!of_prop)
 415                 return;
 416         dn = of_find_node_by_path("/");
 417         if (dn) {
 418                 memset(of_prop, -1, sizeof(struct property) + 256);
 419                 of_prop->name = "pci-OF-bus-map";
 420                 of_prop->length = 256;
 421                 of_prop->value = &of_prop[1];
 422                 prom_add_property(dn, of_prop);
 423                 of_node_put(dn);
 424         }
 425 }
 426
 427 #else /* CONFIG_PPC_OF */
 428 void pcibios_make_OF_bus_map(void)
 429 {
 430 }
 431 #endif /* CONFIG_PPC_OF */
 432
 433 static int __init pcibios_init(void)
 434 {
 435         struct pci_controller *hose, *tmp;
 436         struct pci_bus *bus;
 437         int next_busno = 0;
 438
 439         printk(KERN_INFO "PCI: Probing PCI hardware\n");
 440
 441         if (ppc_pci_flags & PPC_PCI_REASSIGN_ALL_BUS)
 442                 pci_assign_all_buses = 1;
 443
 444         /* Scan all of the recorded PCI controllers.  */
 445         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 446                 if (pci_assign_all_buses)
 447                         hose->first_busno = next_busno;
 448                 hose->last_busno = 0xff;
 449                 bus = pci_scan_bus_parented(hose->parent, hose->first_busno,
 450                                             hose->ops, hose);
 451                 if (bus) {
 452                         pci_bus_add_devices(bus);
 453                         hose->last_busno = bus->subordinate;
 454                 }
 455                 if (pci_assign_all_buses || next_busno <= hose->last_busno)
 456                         next_busno = hose->last_busno + pcibios_assign_bus_offset;
 457         }
 458         pci_bus_count = next_busno;
 459
 460         /* OpenFirmware based machines need a map of OF bus
 461          * numbers vs. kernel bus numbers since we may have to
 462          * remap them.
 463          */
 464         if (pci_assign_all_buses && have_of)
 465                 pcibios_make_OF_bus_map();
 466
 467         /* Call common code to handle resource allocation */
 468         pcibios_resource_survey();
 469
 470         /* Call machine dependent post-init code */
 471         if (ppc_md.pcibios_after_init)
 472                 ppc_md.pcibios_after_init();
 473
 474         return 0;
 475 }
 476
 477 subsys_initcall(pcibios_init);
 478
 479 void __devinit pcibios_do_bus_setup(struct pci_bus *bus)
 480 {
 481         struct pci_controller *hose = (struct pci_controller *) bus->sysdata;
 482         unsigned long io_offset;
 483         struct resource *res;
 484         int i;
 485
 486         /* Hookup PHB resources */
 487         io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
 488         if (bus->parent == NULL) {
 489                 /* This is a host bridge - fill in its resources */
 490                 hose->bus = bus;
 491
 492                 bus->resource[0] = res = &hose->io_resource;
 493                 if (!res->flags) {
 494                         if (io_offset)
 495                                 printk(KERN_ERR "I/O resource not set for host"
 496                                        " bridge %d\n", hose->global_number);
 497                         res->start = 0;
 498                         res->end = IO_SPACE_LIMIT;
 499                         res->flags = IORESOURCE_IO;
 500                 }
 501                 res->start = (res->start + io_offset) & 0xffffffffu;
 502                 res->end = (res->end + io_offset) & 0xffffffffu;
 503
 504                 for (i = 0; i < 3; ++i) {
 505                         res = &hose->mem_resources[i];
 506                         if (!res->flags) {
 507                                 if (i > 0)
 508                                         continue;
 509                                 printk(KERN_ERR "Memory resource not set for "
 510                                        "host bridge %d\n", hose->global_number);
 511                                 res->start = hose->pci_mem_offset;
 512                                 res->end = ~0U;
 513                                 res->flags = IORESOURCE_MEM;
 514                         }
 515                         bus->resource[i+1] = res;
 516                 }
 517         }
 518 }
 519
 520 /* the next one is stolen from the alpha port... */
 521 void __init
 522 pcibios_update_irq(struct pci_dev *dev, int irq)
 523 {
 524         pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
 525         /* XXX FIXME - update OF device tree node interrupt property */
 526 }
 527
 528 static struct pci_controller*
 529 pci_bus_to_hose(int bus)
 530 {
 531         struct pci_controller *hose, *tmp;
 532
 533         list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
 534                 if (bus >= hose->first_busno && bus <= hose->last_busno)
 535                         return hose;
 536         return NULL;
 537 }
 538
 539 /* Provide information on locations of various I/O regions in physical
 540  * memory.  Do this on a per-card basis so that we choose the right
 541  * root bridge.
 542  * Note that the returned IO or memory base is a physical address
 543  */
 544
 545 long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
 546 {
 547         struct pci_controller* hose;
 548         long result = -EOPNOTSUPP;
 549
 550         hose = pci_bus_to_hose(bus);
 551         if (!hose)
 552                 return -ENODEV;
 553
 554         switch (which) {
 555         case IOBASE_BRIDGE_NUMBER:
 556                 return (long)hose->first_busno;
 557         case IOBASE_MEMORY:
 558                 return (long)hose->pci_mem_offset;
 559         case IOBASE_IO:
 560                 return (long)hose->io_base_phys;
 561         case IOBASE_ISA_IO:
 562                 return (long)isa_io_base;
 563         case IOBASE_ISA_MEM:
 564                 return (long)isa_mem_base;
 565         }
 566
 567         return result;
 568 }
 569
 570 unsigned long pci_address_to_pio(phys_addr_t address)
 571 {
 572         struct pci_controller *hose, *tmp;
 573
 574         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 575                 unsigned int size = hose->io_resource.end -
 576                         hose->io_resource.start + 1;
 577                 if (address >= hose->io_base_phys &&
 578                     address < (hose->io_base_phys + size)) {
 579                         unsigned long base =
 580                                 (unsigned long)hose->io_base_virt - _IO_BASE;
 581                         return base + (address - hose->io_base_phys);
 582                 }
 583         }
 584         return (unsigned int)-1;
 585 }
 586 EXPORT_SYMBOL(pci_address_to_pio);
 587
 588 /*
 589  * Null PCI config access functions, for the case when we can't
 590  * find a hose.
 591  */
 592 #define NULL_PCI_OP(rw, size, type)                                     \
 593 static int                                                              \
 594 null_##rw##_config_##size(struct pci_dev *dev, int offset, type val)    \
 595 {                                                                       \
 596         return PCIBIOS_DEVICE_NOT_FOUND;                                \
 597 }
 598
 599 static int
 600 null_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
 601                  int len, u32 *val)
 602 {
 603         return PCIBIOS_DEVICE_NOT_FOUND;
 604 }
 605
 606 static int
 607 null_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
 608                   int len, u32 val)
 609 {
 610         return PCIBIOS_DEVICE_NOT_FOUND;
 611 }
 612
 613 static struct pci_ops null_pci_ops =
 614 {
 615         .read = null_read_config,
 616         .write = null_write_config,
 617 };
 618
 619 /*
 620  * These functions are used early on before PCI scanning is done
 621  * and all of the pci_dev and pci_bus structures have been created.
 622  */
 623 static struct pci_bus *
 624 fake_pci_bus(struct pci_controller *hose, int busnr)
 625 {
 626         static struct pci_bus bus;
 627
 628         if (hose == 0) {
 629                 hose = pci_bus_to_hose(busnr);
 630                 if (hose == 0)
 631                         printk(KERN_ERR "Can't find hose for PCI bus %d!\n", busnr);
 632         }
 633         bus.number = busnr;
 634         bus.sysdata = hose;
 635         bus.ops = hose? hose->ops: &null_pci_ops;
 636         return &bus;
 637 }
 638
 639 #define EARLY_PCI_OP(rw, size, type)                                    \
 640 int early_##rw##_config_##size(struct pci_controller *hose, int bus,    \
 641                                int devfn, int offset, type value)       \
 642 {                                                                       \
 643         return pci_bus_##rw##_config_##size(fake_pci_bus(hose, bus),    \
 644                                             devfn, offset, value);      \
 645 }
 646
 647 EARLY_PCI_OP(read, byte, u8 *)
 648 EARLY_PCI_OP(read, word, u16 *)
 649 EARLY_PCI_OP(read, dword, u32 *)
 650 EARLY_PCI_OP(write, byte, u8)
 651 EARLY_PCI_OP(write, word, u16)
 652 EARLY_PCI_OP(write, dword, u32)
 653
 654 extern int pci_bus_find_capability (struct pci_bus *bus, unsigned int devfn, int cap);
 655 int early_find_capability(struct pci_controller *hose, int bus, int devfn,
 656                           int cap)
 657 {
 658         return pci_bus_find_capability(fake_pci_bus(hose, bus), devfn, cap);
 659 }