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 #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 }