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 unsigned long isa_io_base     = 0;
  30 unsigned long pci_dram_offset = 0;
  31 int pcibios_assign_bus_offset = 1;
  32
  33 void pcibios_make_OF_bus_map(void);
  34
  35 static void fixup_broken_pcnet32(struct pci_dev* dev);
  36 static void fixup_cpc710_pci64(struct pci_dev* dev);
  37 #ifdef CONFIG_PPC_OF
  38 static u8* pci_to_OF_bus_map;
  39 #endif
  40
  41 /* By default, we don't re-assign bus numbers. We do this only on
  42  * some pmacs
  43  */
  44 static int pci_assign_all_buses;
  45
  46 LIST_HEAD(hose_list);
  47
  48 static int pci_bus_count;
  49
  50 /* This will remain NULL for now, until isa-bridge.c is made common
  51  * to both 32-bit and 64-bit.
  52  */
  53 struct pci_dev *isa_bridge_pcidev;
  54 EXPORT_SYMBOL_GPL(isa_bridge_pcidev);
  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              class == PCI_CLASS_BRIDGE_OTHER) &&
  63                 (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) &&
  64                 (dev->bus->parent == NULL)) {
  65                 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
  66                         dev->resource[i].start = 0;
  67                         dev->resource[i].end = 0;
  68                         dev->resource[i].flags = 0;
  69                 }
  70         }
  71 }
  72 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MOTOROLA, PCI_ANY_ID, fixup_hide_host_resource_fsl);
  73 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, fixup_hide_host_resource_fsl);
  74
  75 static void
  76 fixup_broken_pcnet32(struct pci_dev* dev)
  77 {
  78         if ((dev->class>>8 == PCI_CLASS_NETWORK_ETHERNET)) {
  79                 dev->vendor = PCI_VENDOR_ID_AMD;
  80                 pci_write_config_word(dev, PCI_VENDOR_ID, PCI_VENDOR_ID_AMD);
  81         }
  82 }
  83 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_TRIDENT, PCI_ANY_ID,                     fixup_broken_pcnet32);
  84
  85 static void
  86 fixup_cpc710_pci64(struct pci_dev* dev)
  87 {
  88         /* Hide the PCI64 BARs from the kernel as their content doesn't
  89          * fit well in the resource management
  90          */
  91         dev->resource[0].start = dev->resource[0].end = 0;
  92         dev->resource[0].flags = 0;
  93         dev->resource[1].start = dev->resource[1].end = 0;
  94         dev->resource[1].flags = 0;
  95 }
  96 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM,     PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64);
  97
  98 #ifdef CONFIG_PPC_OF
  99 /*
 100  * Functions below are used on OpenFirmware machines.
 101  */
 102 static void
 103 make_one_node_map(struct device_node* node, u8 pci_bus)
 104 {
 105         const int *bus_range;
 106         int len;
 107
 108         if (pci_bus >= pci_bus_count)
 109                 return;
 110         bus_range = of_get_property(node, "bus-range", &len);
 111         if (bus_range == NULL || len < 2 * sizeof(int)) {
 112                 printk(KERN_WARNING "Can't get bus-range for %s, "
 113                        "assuming it starts at 0\n", node->full_name);
 114                 pci_to_OF_bus_map[pci_bus] = 0;
 115         } else
 116                 pci_to_OF_bus_map[pci_bus] = bus_range[0];
 117
 118         for_each_child_of_node(node, node) {
 119                 struct pci_dev* dev;
 120                 const unsigned int *class_code, *reg;
 121
 122                 class_code = of_get_property(node, "class-code", NULL);
 123                 if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
 124                         (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
 125                         continue;
 126                 reg = of_get_property(node, "reg", NULL);
 127                 if (!reg)
 128                         continue;
 129                 dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff));
 130                 if (!dev || !dev->subordinate) {
 131                         pci_dev_put(dev);
 132                         continue;
 133                 }
 134                 make_one_node_map(node, dev->subordinate->number);
 135                 pci_dev_put(dev);
 136         }
 137 }
 138
 139 void
 140 pcibios_make_OF_bus_map(void)
 141 {
 142         int i;
 143         struct pci_controller *hose, *tmp;
 144         struct property *map_prop;
 145         struct device_node *dn;
 146
 147         pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
 148         if (!pci_to_OF_bus_map) {
 149                 printk(KERN_ERR "Can't allocate OF bus map !\n");
 150                 return;
 151         }
 152
 153         /* We fill the bus map with invalid values, that helps
 154          * debugging.
 155          */
 156         for (i=0; i<pci_bus_count; i++)
 157                 pci_to_OF_bus_map[i] = 0xff;
 158
 159         /* For each hose, we begin searching bridges */
 160         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 161                 struct device_node* node = hose->dn;
 162
 163                 if (!node)
 164                         continue;
 165                 make_one_node_map(node, hose->first_busno);
 166         }
 167         dn = of_find_node_by_path("/");
 168         map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
 169         if (map_prop) {
 170                 BUG_ON(pci_bus_count > map_prop->length);
 171                 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
 172         }
 173         of_node_put(dn);
 174 #ifdef DEBUG
 175         printk("PCI->OF bus map:\n");
 176         for (i=0; i<pci_bus_count; i++) {
 177                 if (pci_to_OF_bus_map[i] == 0xff)
 178                         continue;
 179                 printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
 180         }
 181 #endif
 182 }
 183
 184 typedef int (*pci_OF_scan_iterator)(struct device_node* node, void* data);
 185
 186 static struct device_node*
 187 scan_OF_pci_childs(struct device_node *parent, pci_OF_scan_iterator filter, void* data)
 188 {
 189         struct device_node *node;
 190         struct device_node* sub_node;
 191
 192         for_each_child_of_node(parent, node) {
 193                 const unsigned int *class_code;
 194
 195                 if (filter(node, data)) {
 196                         of_node_put(node);
 197                         return node;
 198                 }
 199
 200                 /* For PCI<->PCI bridges or CardBus bridges, we go down
 201                  * Note: some OFs create a parent node "multifunc-device" as
 202                  * a fake root for all functions of a multi-function device,
 203                  * we go down them as well.
 204                  */
 205                 class_code = of_get_property(node, "class-code", NULL);
 206                 if ((!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
 207                         (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) &&
 208                         strcmp(node->name, "multifunc-device"))
 209                         continue;
 210                 sub_node = scan_OF_pci_childs(node, filter, data);
 211                 if (sub_node) {
 212                         of_node_put(node);
 213                         return sub_node;
 214                 }
 215         }
 216         return NULL;
 217 }
 218
 219 static struct device_node *scan_OF_for_pci_dev(struct device_node *parent,
 220                                                unsigned int devfn)
 221 {
 222         struct device_node *np;
 223         const u32 *reg;
 224         unsigned int psize;
 225
 226         for_each_child_of_node(parent, np) {
 227                 reg = of_get_property(np, "reg", &psize);
 228                 if (reg == NULL || psize < 4)
 229                         continue;
 230                 if (((reg[0] >> 8) & 0xff) == devfn)
 231                         return np;
 232         }
 233         return NULL;
 234 }
 235
 236
 237 static struct device_node *scan_OF_for_pci_bus(struct pci_bus *bus)
 238 {
 239         struct device_node *parent, *np;
 240
 241         /* Are we a root bus ? */
 242         if (bus->self == NULL || bus->parent == NULL) {
 243                 struct pci_controller *hose = pci_bus_to_host(bus);
 244                 if (hose == NULL)
 245                         return NULL;
 246                 return of_node_get(hose->dn);
 247         }
 248
 249         /* not a root bus, we need to get our parent */
 250         parent = scan_OF_for_pci_bus(bus->parent);
 251         if (parent == NULL)
 252                 return NULL;
 253
 254         /* now iterate for children for a match */
 255         np = scan_OF_for_pci_dev(parent, bus->self->devfn);
 256         of_node_put(parent);
 257
 258         return np;
 259 }
 260
 261 /*
 262  * Scans the OF tree for a device node matching a PCI device
 263  */
 264 struct device_node *
 265 pci_busdev_to_OF_node(struct pci_bus *bus, int devfn)
 266 {
 267         struct device_node *parent, *np;
 268
 269         pr_debug("pci_busdev_to_OF_node(%d,0x%x)\n", bus->number, devfn);
 270         parent = scan_OF_for_pci_bus(bus);
 271         if (parent == NULL)
 272                 return NULL;
 273         pr_debug(" parent is %s\n", parent ? parent->full_name : "<NULL>");
 274         np = scan_OF_for_pci_dev(parent, devfn);
 275         of_node_put(parent);
 276         pr_debug(" result is %s\n", np ? np->full_name : "<NULL>");
 277
 278         /* XXX most callers don't release the returned node
 279          * mostly because ppc64 doesn't increase the refcount,
 280          * we need to fix that.
 281          */
 282         return np;
 283 }
 284 EXPORT_SYMBOL(pci_busdev_to_OF_node);
 285
 286 struct device_node*
 287 pci_device_to_OF_node(struct pci_dev *dev)
 288 {
 289         return pci_busdev_to_OF_node(dev->bus, dev->devfn);
 290 }
 291 EXPORT_SYMBOL(pci_device_to_OF_node);
 292
 293 static int
 294 find_OF_pci_device_filter(struct device_node* node, void* data)
 295 {
 296         return ((void *)node == data);
 297 }
 298
 299 /*
 300  * Returns the PCI device matching a given OF node
 301  */
 302 int
 303 pci_device_from_OF_node(struct device_node* node, u8* bus, u8* devfn)
 304 {
 305         const unsigned int *reg;
 306         struct pci_controller* hose;
 307         struct pci_dev* dev = NULL;
 308
 309         /* Make sure it's really a PCI device */
 310         hose = pci_find_hose_for_OF_device(node);
 311         if (!hose || !hose->dn)
 312                 return -ENODEV;
 313         if (!scan_OF_pci_childs(hose->dn,
 314                         find_OF_pci_device_filter, (void *)node))
 315                 return -ENODEV;
 316         reg = of_get_property(node, "reg", NULL);
 317         if (!reg)
 318                 return -ENODEV;
 319         *bus = (reg[0] >> 16) & 0xff;
 320         *devfn = ((reg[0] >> 8) & 0xff);
 321
 322         /* Ok, here we need some tweak. If we have already renumbered
 323          * all busses, we can't rely on the OF bus number any more.
 324          * the pci_to_OF_bus_map is not enough as several PCI busses
 325          * may match the same OF bus number.
 326          */
 327         if (!pci_to_OF_bus_map)
 328                 return 0;
 329
 330         for_each_pci_dev(dev)
 331                 if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
 332                                 dev->devfn == *devfn) {
 333                         *bus = dev->bus->number;
 334                         pci_dev_put(dev);
 335                         return 0;
 336                 }
 337
 338         return -ENODEV;
 339 }
 340 EXPORT_SYMBOL(pci_device_from_OF_node);
 341
 342 /* We create the "pci-OF-bus-map" property now so it appears in the
 343  * /proc device tree
 344  */
 345 void __init
 346 pci_create_OF_bus_map(void)
 347 {
 348         struct property* of_prop;
 349         struct device_node *dn;
 350
 351         of_prop = (struct property*) alloc_bootmem(sizeof(struct property) + 256);
 352         if (!of_prop)
 353                 return;
 354         dn = of_find_node_by_path("/");
 355         if (dn) {
 356                 memset(of_prop, -1, sizeof(struct property) + 256);
 357                 of_prop->name = "pci-OF-bus-map";
 358                 of_prop->length = 256;
 359                 of_prop->value = &of_prop[1];
 360                 prom_add_property(dn, of_prop);
 361                 of_node_put(dn);
 362         }
 363 }
 364
 365 #else /* CONFIG_PPC_OF */
 366 void pcibios_make_OF_bus_map(void)
 367 {
 368 }
 369 #endif /* CONFIG_PPC_OF */
 370
 371 static void __devinit pcibios_scan_phb(struct pci_controller *hose)
 372 {
 373         struct pci_bus *bus;
 374         struct device_node *node = hose->dn;
 375         unsigned long io_offset;
 376         struct resource *res = &hose->io_resource;
 377
 378         pr_debug("PCI: Scanning PHB %s\n",
 379                  node ? node->full_name : "<NO NAME>");
 380
 381         /* Create an empty bus for the toplevel */
 382         bus = pci_create_bus(hose->parent, hose->first_busno, hose->ops, hose);
 383         if (bus == NULL) {
 384                 printk(KERN_ERR "Failed to create bus for PCI domain %04x\n",
 385                        hose->global_number);
 386                 return;
 387         }
 388         bus->secondary = hose->first_busno;
 389         hose->bus = bus;
 390
 391         /* Fixup IO space offset */
 392         io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
 393         res->start = (res->start + io_offset) & 0xffffffffu;
 394         res->end = (res->end + io_offset) & 0xffffffffu;
 395
 396         /* Wire up PHB bus resources */
 397         pcibios_setup_phb_resources(hose);
 398
 399         /* Scan children */
 400         hose->last_busno = bus->subordinate = pci_scan_child_bus(bus);
 401 }
 402
 403 static int __init pcibios_init(void)
 404 {
 405         struct pci_controller *hose, *tmp;
 406         int next_busno = 0;
 407
 408         printk(KERN_INFO "PCI: Probing PCI hardware\n");
 409
 410         if (ppc_pci_flags & PPC_PCI_REASSIGN_ALL_BUS)
 411                 pci_assign_all_buses = 1;
 412
 413         /* Scan all of the recorded PCI controllers.  */
 414         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 415                 if (pci_assign_all_buses)
 416                         hose->first_busno = next_busno;
 417                 hose->last_busno = 0xff;
 418                 pcibios_scan_phb(hose);
 419                 pci_bus_add_devices(hose->bus);
 420                 if (pci_assign_all_buses || next_busno <= hose->last_busno)
 421                         next_busno = hose->last_busno + pcibios_assign_bus_offset;
 422         }
 423         pci_bus_count = next_busno;
 424
 425         /* OpenFirmware based machines need a map of OF bus
 426          * numbers vs. kernel bus numbers since we may have to
 427          * remap them.
 428          */
 429         if (pci_assign_all_buses)
 430                 pcibios_make_OF_bus_map();
 431
 432         /* Call common code to handle resource allocation */
 433         pcibios_resource_survey();
 434
 435         /* Call machine dependent post-init code */
 436         if (ppc_md.pcibios_after_init)
 437                 ppc_md.pcibios_after_init();
 438
 439         return 0;
 440 }
 441
 442 subsys_initcall(pcibios_init);
 443
 444 /* the next one is stolen from the alpha port... */
 445 void __init
 446 pcibios_update_irq(struct pci_dev *dev, int irq)
 447 {
 448         pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
 449         /* XXX FIXME - update OF device tree node interrupt property */
 450 }
 451
 452 static struct pci_controller*
 453 pci_bus_to_hose(int bus)
 454 {
 455         struct pci_controller *hose, *tmp;
 456
 457         list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
 458                 if (bus >= hose->first_busno && bus <= hose->last_busno)
 459                         return hose;
 460         return NULL;
 461 }
 462
 463 /* Provide information on locations of various I/O regions in physical
 464  * memory.  Do this on a per-card basis so that we choose the right
 465  * root bridge.
 466  * Note that the returned IO or memory base is a physical address
 467  */
 468
 469 long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
 470 {
 471         struct pci_controller* hose;
 472         long result = -EOPNOTSUPP;
 473
 474         hose = pci_bus_to_hose(bus);
 475         if (!hose)
 476                 return -ENODEV;
 477
 478         switch (which) {
 479         case IOBASE_BRIDGE_NUMBER:
 480                 return (long)hose->first_busno;
 481         case IOBASE_MEMORY:
 482                 return (long)hose->pci_mem_offset;
 483         case IOBASE_IO:
 484                 return (long)hose->io_base_phys;
 485         case IOBASE_ISA_IO:
 486                 return (long)isa_io_base;
 487         case IOBASE_ISA_MEM:
 488                 return (long)isa_mem_base;
 489         }
 490
 491         return result;
 492 }
 493
 494 unsigned long pci_address_to_pio(phys_addr_t address)
 495 {
 496         struct pci_controller *hose, *tmp;
 497
 498         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 499                 unsigned int size = hose->io_resource.end -
 500                         hose->io_resource.start + 1;
 501                 if (address >= hose->io_base_phys &&
 502                     address < (hose->io_base_phys + size)) {
 503                         unsigned long base =
 504                                 (unsigned long)hose->io_base_virt - _IO_BASE;
 505                         return base + (address - hose->io_base_phys);
 506                 }
 507         }
 508         return (unsigned int)-1;
 509 }
 510 EXPORT_SYMBOL(pci_address_to_pio);
 511
 512 /*
 513  * Null PCI config access functions, for the case when we can't
 514  * find a hose.
 515  */
 516 #define NULL_PCI_OP(rw, size, type)                                     \
 517 static int                                                              \
 518 null_##rw##_config_##size(struct pci_dev *dev, int offset, type val)    \
 519 {                                                                       \
 520         return PCIBIOS_DEVICE_NOT_FOUND;                                \
 521 }
 522
 523 static int
 524 null_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
 525                  int len, u32 *val)
 526 {
 527         return PCIBIOS_DEVICE_NOT_FOUND;
 528 }
 529
 530 static int
 531 null_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
 532                   int len, u32 val)
 533 {
 534         return PCIBIOS_DEVICE_NOT_FOUND;
 535 }
 536
 537 static struct pci_ops null_pci_ops =
 538 {
 539         .read = null_read_config,
 540         .write = null_write_config,
 541 };
 542
 543 /*
 544  * These functions are used early on before PCI scanning is done
 545  * and all of the pci_dev and pci_bus structures have been created.
 546  */
 547 static struct pci_bus *
 548 fake_pci_bus(struct pci_controller *hose, int busnr)
 549 {
 550         static struct pci_bus bus;
 551
 552         if (hose == 0) {
 553                 hose = pci_bus_to_hose(busnr);
 554                 if (hose == 0)
 555                         printk(KERN_ERR "Can't find hose for PCI bus %d!\n", busnr);
 556         }
 557         bus.number = busnr;
 558         bus.sysdata = hose;
 559         bus.ops = hose? hose->ops: &null_pci_ops;
 560         return &bus;
 561 }
 562
 563 #define EARLY_PCI_OP(rw, size, type)                                    \
 564 int early_##rw##_config_##size(struct pci_controller *hose, int bus,    \
 565                                int devfn, int offset, type value)       \
 566 {                                                                       \
 567         return pci_bus_##rw##_config_##size(fake_pci_bus(hose, bus),    \
 568                                             devfn, offset, value);      \
 569 }
 570
 571 EARLY_PCI_OP(read, byte, u8 *)
 572 EARLY_PCI_OP(read, word, u16 *)
 573 EARLY_PCI_OP(read, dword, u32 *)
 574 EARLY_PCI_OP(write, byte, u8)
 575 EARLY_PCI_OP(write, word, u16)
 576 EARLY_PCI_OP(write, dword, u32)
 577
 578 extern int pci_bus_find_capability (struct pci_bus *bus, unsigned int devfn, int cap);
 579 int early_find_capability(struct pci_controller *hose, int bus, int devfn,
 580                           int cap)
 581 {
 582         return pci_bus_find_capability(fake_pci_bus(hose, bus), devfn, cap);
 583 }