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 /* This will remain NULL for now, until isa-bridge.c is made common
  57  * to both 32-bit and 64-bit.
  58  */
  59 struct pci_dev *isa_bridge_pcidev;
  60 EXPORT_SYMBOL_GPL(isa_bridge_pcidev);
  61
  62 static void
  63 fixup_hide_host_resource_fsl(struct pci_dev *dev)
  64 {
  65         int i, class = dev->class >> 8;
  66
  67         if ((class == PCI_CLASS_PROCESSOR_POWERPC ||
  68              class == PCI_CLASS_BRIDGE_OTHER) &&
  69                 (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) &&
  70                 (dev->bus->parent == NULL)) {
  71                 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
  72                         dev->resource[i].start = 0;
  73                         dev->resource[i].end = 0;
  74                         dev->resource[i].flags = 0;
  75                 }
  76         }
  77 }
  78 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MOTOROLA, PCI_ANY_ID, fixup_hide_host_resource_fsl);
  79 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, fixup_hide_host_resource_fsl);
  80
  81 static void
  82 fixup_broken_pcnet32(struct pci_dev* dev)
  83 {
  84         if ((dev->class>>8 == PCI_CLASS_NETWORK_ETHERNET)) {
  85                 dev->vendor = PCI_VENDOR_ID_AMD;
  86                 pci_write_config_word(dev, PCI_VENDOR_ID, PCI_VENDOR_ID_AMD);
  87         }
  88 }
  89 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_TRIDENT, PCI_ANY_ID,                     fixup_broken_pcnet32);
  90
  91 static void
  92 fixup_cpc710_pci64(struct pci_dev* dev)
  93 {
  94         /* Hide the PCI64 BARs from the kernel as their content doesn't
  95          * fit well in the resource management
  96          */
  97         dev->resource[0].start = dev->resource[0].end = 0;
  98         dev->resource[0].flags = 0;
  99         dev->resource[1].start = dev->resource[1].end = 0;
 100         dev->resource[1].flags = 0;
 101 }
 102 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM,     PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64);
 103
 104 #ifdef CONFIG_PPC_OF
 105 /*
 106  * Functions below are used on OpenFirmware machines.
 107  */
 108 static void
 109 make_one_node_map(struct device_node* node, u8 pci_bus)
 110 {
 111         const int *bus_range;
 112         int len;
 113
 114         if (pci_bus >= pci_bus_count)
 115                 return;
 116         bus_range = of_get_property(node, "bus-range", &len);
 117         if (bus_range == NULL || len < 2 * sizeof(int)) {
 118                 printk(KERN_WARNING "Can't get bus-range for %s, "
 119                        "assuming it starts at 0\n", node->full_name);
 120                 pci_to_OF_bus_map[pci_bus] = 0;
 121         } else
 122                 pci_to_OF_bus_map[pci_bus] = bus_range[0];
 123
 124         for_each_child_of_node(node, node) {
 125                 struct pci_dev* dev;
 126                 const unsigned int *class_code, *reg;
 127
 128                 class_code = of_get_property(node, "class-code", NULL);
 129                 if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
 130                         (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
 131                         continue;
 132                 reg = of_get_property(node, "reg", NULL);
 133                 if (!reg)
 134                         continue;
 135                 dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff));
 136                 if (!dev || !dev->subordinate) {
 137                         pci_dev_put(dev);
 138                         continue;
 139                 }
 140                 make_one_node_map(node, dev->subordinate->number);
 141                 pci_dev_put(dev);
 142         }
 143 }
 144
 145 void
 146 pcibios_make_OF_bus_map(void)
 147 {
 148         int i;
 149         struct pci_controller *hose, *tmp;
 150         struct property *map_prop;
 151         struct device_node *dn;
 152
 153         pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
 154         if (!pci_to_OF_bus_map) {
 155                 printk(KERN_ERR "Can't allocate OF bus map !\n");
 156                 return;
 157         }
 158
 159         /* We fill the bus map with invalid values, that helps
 160          * debugging.
 161          */
 162         for (i=0; i<pci_bus_count; i++)
 163                 pci_to_OF_bus_map[i] = 0xff;
 164
 165         /* For each hose, we begin searching bridges */
 166         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 167                 struct device_node* node = hose->dn;
 168
 169                 if (!node)
 170                         continue;
 171                 make_one_node_map(node, hose->first_busno);
 172         }
 173         dn = of_find_node_by_path("/");
 174         map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
 175         if (map_prop) {
 176                 BUG_ON(pci_bus_count > map_prop->length);
 177                 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
 178         }
 179         of_node_put(dn);
 180 #ifdef DEBUG
 181         printk("PCI->OF bus map:\n");
 182         for (i=0; i<pci_bus_count; i++) {
 183                 if (pci_to_OF_bus_map[i] == 0xff)
 184                         continue;
 185                 printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
 186         }
 187 #endif
 188 }
 189
 190 typedef int (*pci_OF_scan_iterator)(struct device_node* node, void* data);
 191
 192 static struct device_node*
 193 scan_OF_pci_childs(struct device_node *parent, pci_OF_scan_iterator filter, void* data)
 194 {
 195         struct device_node *node;
 196         struct device_node* sub_node;
 197
 198         for_each_child_of_node(parent, node) {
 199                 const unsigned int *class_code;
 200
 201                 if (filter(node, data)) {
 202                         of_node_put(node);
 203                         return node;
 204                 }
 205
 206                 /* For PCI<->PCI bridges or CardBus bridges, we go down
 207                  * Note: some OFs create a parent node "multifunc-device" as
 208                  * a fake root for all functions of a multi-function device,
 209                  * we go down them as well.
 210                  */
 211                 class_code = of_get_property(node, "class-code", NULL);
 212                 if ((!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
 213                         (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) &&
 214                         strcmp(node->name, "multifunc-device"))
 215                         continue;
 216                 sub_node = scan_OF_pci_childs(node, filter, data);
 217                 if (sub_node) {
 218                         of_node_put(node);
 219                         return sub_node;
 220                 }
 221         }
 222         return NULL;
 223 }
 224
 225 static struct device_node *scan_OF_for_pci_dev(struct device_node *parent,
 226                                                unsigned int devfn)
 227 {
 228         struct device_node *np;
 229         const u32 *reg;
 230         unsigned int psize;
 231
 232         for_each_child_of_node(parent, np) {
 233                 reg = of_get_property(np, "reg", &psize);
 234                 if (reg == NULL || psize < 4)
 235                         continue;
 236                 if (((reg[0] >> 8) & 0xff) == devfn)
 237                         return np;
 238         }
 239         return NULL;
 240 }
 241
 242
 243 static struct device_node *scan_OF_for_pci_bus(struct pci_bus *bus)
 244 {
 245         struct device_node *parent, *np;
 246
 247         /* Are we a root bus ? */
 248         if (bus->self == NULL || bus->parent == NULL) {
 249                 struct pci_controller *hose = pci_bus_to_host(bus);
 250                 if (hose == NULL)
 251                         return NULL;
 252                 return of_node_get(hose->dn);
 253         }
 254
 255         /* not a root bus, we need to get our parent */
 256         parent = scan_OF_for_pci_bus(bus->parent);
 257         if (parent == NULL)
 258                 return NULL;
 259
 260         /* now iterate for children for a match */
 261         np = scan_OF_for_pci_dev(parent, bus->self->devfn);
 262         of_node_put(parent);
 263
 264         return np;
 265 }
 266
 267 /*
 268  * Scans the OF tree for a device node matching a PCI device
 269  */
 270 struct device_node *
 271 pci_busdev_to_OF_node(struct pci_bus *bus, int devfn)
 272 {
 273         struct device_node *parent, *np;
 274
 275         if (!have_of)
 276                 return NULL;
 277
 278         DBG("pci_busdev_to_OF_node(%d,0x%x)\n", bus->number, devfn);
 279         parent = scan_OF_for_pci_bus(bus);
 280         if (parent == NULL)
 281                 return NULL;
 282         DBG(" parent is %s\n", parent ? parent->full_name : "<NULL>");
 283         np = scan_OF_for_pci_dev(parent, devfn);
 284         of_node_put(parent);
 285         DBG(" result is %s\n", np ? np->full_name : "<NULL>");
 286
 287         /* XXX most callers don't release the returned node
 288          * mostly because ppc64 doesn't increase the refcount,
 289          * we need to fix that.
 290          */
 291         return np;
 292 }
 293 EXPORT_SYMBOL(pci_busdev_to_OF_node);
 294
 295 struct device_node*
 296 pci_device_to_OF_node(struct pci_dev *dev)
 297 {
 298         return pci_busdev_to_OF_node(dev->bus, dev->devfn);
 299 }
 300 EXPORT_SYMBOL(pci_device_to_OF_node);
 301
 302 static int
 303 find_OF_pci_device_filter(struct device_node* node, void* data)
 304 {
 305         return ((void *)node == data);
 306 }
 307
 308 /*
 309  * Returns the PCI device matching a given OF node
 310  */
 311 int
 312 pci_device_from_OF_node(struct device_node* node, u8* bus, u8* devfn)
 313 {
 314         const unsigned int *reg;
 315         struct pci_controller* hose;
 316         struct pci_dev* dev = NULL;
 317
 318         if (!have_of)
 319                 return -ENODEV;
 320         /* Make sure it's really a PCI device */
 321         hose = pci_find_hose_for_OF_device(node);
 322         if (!hose || !hose->dn)
 323                 return -ENODEV;
 324         if (!scan_OF_pci_childs(hose->dn,
 325                         find_OF_pci_device_filter, (void *)node))
 326                 return -ENODEV;
 327         reg = of_get_property(node, "reg", NULL);
 328         if (!reg)
 329                 return -ENODEV;
 330         *bus = (reg[0] >> 16) & 0xff;
 331         *devfn = ((reg[0] >> 8) & 0xff);
 332
 333         /* Ok, here we need some tweak. If we have already renumbered
 334          * all busses, we can't rely on the OF bus number any more.
 335          * the pci_to_OF_bus_map is not enough as several PCI busses
 336          * may match the same OF bus number.
 337          */
 338         if (!pci_to_OF_bus_map)
 339                 return 0;
 340
 341         for_each_pci_dev(dev)
 342                 if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
 343                                 dev->devfn == *devfn) {
 344                         *bus = dev->bus->number;
 345                         pci_dev_put(dev);
 346                         return 0;
 347                 }
 348
 349         return -ENODEV;
 350 }
 351 EXPORT_SYMBOL(pci_device_from_OF_node);
 352
 353 /* We create the "pci-OF-bus-map" property now so it appears in the
 354  * /proc device tree
 355  */
 356 void __init
 357 pci_create_OF_bus_map(void)
 358 {
 359         struct property* of_prop;
 360         struct device_node *dn;
 361
 362         of_prop = (struct property*) alloc_bootmem(sizeof(struct property) + 256);
 363         if (!of_prop)
 364                 return;
 365         dn = of_find_node_by_path("/");
 366         if (dn) {
 367                 memset(of_prop, -1, sizeof(struct property) + 256);
 368                 of_prop->name = "pci-OF-bus-map";
 369                 of_prop->length = 256;
 370                 of_prop->value = &of_prop[1];
 371                 prom_add_property(dn, of_prop);
 372                 of_node_put(dn);
 373         }
 374 }
 375
 376 #else /* CONFIG_PPC_OF */
 377 void pcibios_make_OF_bus_map(void)
 378 {
 379 }
 380 #endif /* CONFIG_PPC_OF */
 381
 382 static int __init pcibios_init(void)
 383 {
 384         struct pci_controller *hose, *tmp;
 385         struct pci_bus *bus;
 386         int next_busno = 0;
 387
 388         printk(KERN_INFO "PCI: Probing PCI hardware\n");
 389
 390         if (ppc_pci_flags & PPC_PCI_REASSIGN_ALL_BUS)
 391                 pci_assign_all_buses = 1;
 392
 393         /* Scan all of the recorded PCI controllers.  */
 394         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 395                 if (pci_assign_all_buses)
 396                         hose->first_busno = next_busno;
 397                 hose->last_busno = 0xff;
 398                 bus = pci_scan_bus_parented(hose->parent, hose->first_busno,
 399                                             hose->ops, hose);
 400                 if (bus) {
 401                         pci_bus_add_devices(bus);
 402                         hose->last_busno = bus->subordinate;
 403                 }
 404                 if (pci_assign_all_buses || next_busno <= hose->last_busno)
 405                         next_busno = hose->last_busno + pcibios_assign_bus_offset;
 406         }
 407         pci_bus_count = next_busno;
 408
 409         /* OpenFirmware based machines need a map of OF bus
 410          * numbers vs. kernel bus numbers since we may have to
 411          * remap them.
 412          */
 413         if (pci_assign_all_buses && have_of)
 414                 pcibios_make_OF_bus_map();
 415
 416         /* Call common code to handle resource allocation */
 417         pcibios_resource_survey();
 418
 419         /* Call machine dependent post-init code */
 420         if (ppc_md.pcibios_after_init)
 421                 ppc_md.pcibios_after_init();
 422
 423         return 0;
 424 }
 425
 426 subsys_initcall(pcibios_init);
 427
 428 void __devinit pcibios_do_bus_setup(struct pci_bus *bus)
 429 {
 430         struct pci_controller *hose = (struct pci_controller *) bus->sysdata;
 431         unsigned long io_offset;
 432         struct resource *res;
 433         int i;
 434         struct pci_dev *dev;
 435
 436         /* Hookup PHB resources */
 437         io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
 438         if (bus->parent == NULL) {
 439                 /* This is a host bridge - fill in its resources */
 440                 hose->bus = bus;
 441
 442                 bus->resource[0] = res = &hose->io_resource;
 443                 if (!res->flags) {
 444                         if (io_offset)
 445                                 printk(KERN_ERR "I/O resource not set for host"
 446                                        " bridge %d\n", hose->global_number);
 447                         res->start = 0;
 448                         res->end = IO_SPACE_LIMIT;
 449                         res->flags = IORESOURCE_IO;
 450                 }
 451                 res->start = (res->start + io_offset) & 0xffffffffu;
 452                 res->end = (res->end + io_offset) & 0xffffffffu;
 453
 454                 for (i = 0; i < 3; ++i) {
 455                         res = &hose->mem_resources[i];
 456                         if (!res->flags) {
 457                                 if (i > 0)
 458                                         continue;
 459                                 printk(KERN_ERR "Memory resource not set for "
 460                                        "host bridge %d\n", hose->global_number);
 461                                 res->start = hose->pci_mem_offset;
 462                                 res->end = ~0U;
 463                                 res->flags = IORESOURCE_MEM;
 464                         }
 465                         bus->resource[i+1] = res;
 466                 }
 467         }
 468
 469         if (ppc_md.pci_dma_bus_setup)
 470                 ppc_md.pci_dma_bus_setup(bus);
 471
 472         list_for_each_entry(dev, &bus->devices, bus_list)
 473                 pcibios_setup_new_device(dev);
 474 }
 475
 476 /* the next one is stolen from the alpha port... */
 477 void __init
 478 pcibios_update_irq(struct pci_dev *dev, int irq)
 479 {
 480         pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
 481         /* XXX FIXME - update OF device tree node interrupt property */
 482 }
 483
 484 static struct pci_controller*
 485 pci_bus_to_hose(int bus)
 486 {
 487         struct pci_controller *hose, *tmp;
 488
 489         list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
 490                 if (bus >= hose->first_busno && bus <= hose->last_busno)
 491                         return hose;
 492         return NULL;
 493 }
 494
 495 /* Provide information on locations of various I/O regions in physical
 496  * memory.  Do this on a per-card basis so that we choose the right
 497  * root bridge.
 498  * Note that the returned IO or memory base is a physical address
 499  */
 500
 501 long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
 502 {
 503         struct pci_controller* hose;
 504         long result = -EOPNOTSUPP;
 505
 506         hose = pci_bus_to_hose(bus);
 507         if (!hose)
 508                 return -ENODEV;
 509
 510         switch (which) {
 511         case IOBASE_BRIDGE_NUMBER:
 512                 return (long)hose->first_busno;
 513         case IOBASE_MEMORY:
 514                 return (long)hose->pci_mem_offset;
 515         case IOBASE_IO:
 516                 return (long)hose->io_base_phys;
 517         case IOBASE_ISA_IO:
 518                 return (long)isa_io_base;
 519         case IOBASE_ISA_MEM:
 520                 return (long)isa_mem_base;
 521         }
 522
 523         return result;
 524 }
 525
 526 unsigned long pci_address_to_pio(phys_addr_t address)
 527 {
 528         struct pci_controller *hose, *tmp;
 529
 530         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 531                 unsigned int size = hose->io_resource.end -
 532                         hose->io_resource.start + 1;
 533                 if (address >= hose->io_base_phys &&
 534                     address < (hose->io_base_phys + size)) {
 535                         unsigned long base =
 536                                 (unsigned long)hose->io_base_virt - _IO_BASE;
 537                         return base + (address - hose->io_base_phys);
 538                 }
 539         }
 540         return (unsigned int)-1;
 541 }
 542 EXPORT_SYMBOL(pci_address_to_pio);
 543
 544 /*
 545  * Null PCI config access functions, for the case when we can't
 546  * find a hose.
 547  */
 548 #define NULL_PCI_OP(rw, size, type)                                     \
 549 static int                                                              \
 550 null_##rw##_config_##size(struct pci_dev *dev, int offset, type val)    \
 551 {                                                                       \
 552         return PCIBIOS_DEVICE_NOT_FOUND;                                \
 553 }
 554
 555 static int
 556 null_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
 557                  int len, u32 *val)
 558 {
 559         return PCIBIOS_DEVICE_NOT_FOUND;
 560 }
 561
 562 static int
 563 null_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
 564                   int len, u32 val)
 565 {
 566         return PCIBIOS_DEVICE_NOT_FOUND;
 567 }
 568
 569 static struct pci_ops null_pci_ops =
 570 {
 571         .read = null_read_config,
 572         .write = null_write_config,
 573 };
 574
 575 /*
 576  * These functions are used early on before PCI scanning is done
 577  * and all of the pci_dev and pci_bus structures have been created.
 578  */
 579 static struct pci_bus *
 580 fake_pci_bus(struct pci_controller *hose, int busnr)
 581 {
 582         static struct pci_bus bus;
 583
 584         if (hose == 0) {
 585                 hose = pci_bus_to_hose(busnr);
 586                 if (hose == 0)
 587                         printk(KERN_ERR "Can't find hose for PCI bus %d!\n", busnr);
 588         }
 589         bus.number = busnr;
 590         bus.sysdata = hose;
 591         bus.ops = hose? hose->ops: &null_pci_ops;
 592         return &bus;
 593 }
 594
 595 #define EARLY_PCI_OP(rw, size, type)                                    \
 596 int early_##rw##_config_##size(struct pci_controller *hose, int bus,    \
 597                                int devfn, int offset, type value)       \
 598 {                                                                       \
 599         return pci_bus_##rw##_config_##size(fake_pci_bus(hose, bus),    \
 600                                             devfn, offset, value);      \
 601 }
 602
 603 EARLY_PCI_OP(read, byte, u8 *)
 604 EARLY_PCI_OP(read, word, u16 *)
 605 EARLY_PCI_OP(read, dword, u32 *)
 606 EARLY_PCI_OP(write, byte, u8)
 607 EARLY_PCI_OP(write, word, u16)
 608 EARLY_PCI_OP(write, dword, u32)
 609
 610 extern int pci_bus_find_capability (struct pci_bus *bus, unsigned int devfn, int cap);
 611 int early_find_capability(struct pci_controller *hose, int bus, int devfn,
 612                           int cap)
 613 {
 614         return pci_bus_find_capability(fake_pci_bus(hose, bus), devfn, cap);
 615 }