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/ppc-pci.h>
  24 #include <asm/byteorder.h>
  25 #include <asm/uaccess.h>
  26 #include <asm/machdep.h>
  27
  28 #undef DEBUG
  29
  30 unsigned long isa_io_base     = 0;
  31 unsigned long pci_dram_offset = 0;
  32 int pcibios_assign_bus_offset = 1;
  33
  34 void pcibios_make_OF_bus_map(void);
  35
  36 static void fixup_broken_pcnet32(struct pci_dev* dev);
  37 static void fixup_cpc710_pci64(struct pci_dev* dev);
  38 #ifdef CONFIG_PPC_OF
  39 static u8* pci_to_OF_bus_map;
  40 #endif
  41
  42 /* By default, we don't re-assign bus numbers. We do this only on
  43  * some pmacs
  44  */
  45 static int pci_assign_all_buses;
  46
  47 static int pci_bus_count;
  48
  49 /* This will remain NULL for now, until isa-bridge.c is made common
  50  * to both 32-bit and 64-bit.
  51  */
  52 struct pci_dev *isa_bridge_pcidev;
  53 EXPORT_SYMBOL_GPL(isa_bridge_pcidev);
  54
  55 static void
  56 fixup_hide_host_resource_fsl(struct pci_dev *dev)
  57 {
  58         int i, class = dev->class >> 8;
  59
  60         if ((class == PCI_CLASS_PROCESSOR_POWERPC ||
  61              class == PCI_CLASS_BRIDGE_OTHER) &&
  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, *cnp;
 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 && psize >= 4 && ((reg[0] >> 8) & 0xff) == devfn)
 228                         return np;
 229
 230                 /* Note: some OFs create a parent node "multifunc-device" as
 231                  * a fake root for all functions of a multi-function device,
 232                  * we go down them as well. */
 233                 if (!strcmp(np->name, "multifunc-device")) {
 234                         cnp = scan_OF_for_pci_dev(np, devfn);
 235                         if (cnp)
 236                                 return cnp;
 237                 }
 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         pr_debug("pci_busdev_to_OF_node(%d,0x%x)\n", bus->number, devfn);
 276         parent = scan_OF_for_pci_bus(bus);
 277         if (parent == NULL)
 278                 return NULL;
 279         pr_debug(" parent is %s\n", parent ? parent->full_name : "<NULL>");
 280         np = scan_OF_for_pci_dev(parent, devfn);
 281         of_node_put(parent);
 282         pr_debug(" result is %s\n", np ? np->full_name : "<NULL>");
 283
 284         /* XXX most callers don't release the returned node
 285          * mostly because ppc64 doesn't increase the refcount,
 286          * we need to fix that.
 287          */
 288         return np;
 289 }
 290 EXPORT_SYMBOL(pci_busdev_to_OF_node);
 291
 292 struct device_node*
 293 pci_device_to_OF_node(struct pci_dev *dev)
 294 {
 295         return pci_busdev_to_OF_node(dev->bus, dev->devfn);
 296 }
 297 EXPORT_SYMBOL(pci_device_to_OF_node);
 298
 299 static int
 300 find_OF_pci_device_filter(struct device_node* node, void* data)
 301 {
 302         return ((void *)node == data);
 303 }
 304
 305 /*
 306  * Returns the PCI device matching a given OF node
 307  */
 308 int
 309 pci_device_from_OF_node(struct device_node* node, u8* bus, u8* devfn)
 310 {
 311         const unsigned int *reg;
 312         struct pci_controller* hose;
 313         struct pci_dev* dev = NULL;
 314
 315         /* Make sure it's really a PCI device */
 316         hose = pci_find_hose_for_OF_device(node);
 317         if (!hose || !hose->dn)
 318                 return -ENODEV;
 319         if (!scan_OF_pci_childs(hose->dn,
 320                         find_OF_pci_device_filter, (void *)node))
 321                 return -ENODEV;
 322         reg = of_get_property(node, "reg", NULL);
 323         if (!reg)
 324                 return -ENODEV;
 325         *bus = (reg[0] >> 16) & 0xff;
 326         *devfn = ((reg[0] >> 8) & 0xff);
 327
 328         /* Ok, here we need some tweak. If we have already renumbered
 329          * all busses, we can't rely on the OF bus number any more.
 330          * the pci_to_OF_bus_map is not enough as several PCI busses
 331          * may match the same OF bus number.
 332          */
 333         if (!pci_to_OF_bus_map)
 334                 return 0;
 335
 336         for_each_pci_dev(dev)
 337                 if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
 338                                 dev->devfn == *devfn) {
 339                         *bus = dev->bus->number;
 340                         pci_dev_put(dev);
 341                         return 0;
 342                 }
 343
 344         return -ENODEV;
 345 }
 346 EXPORT_SYMBOL(pci_device_from_OF_node);
 347
 348 /* We create the "pci-OF-bus-map" property now so it appears in the
 349  * /proc device tree
 350  */
 351 void __init
 352 pci_create_OF_bus_map(void)
 353 {
 354         struct property* of_prop;
 355         struct device_node *dn;
 356
 357         of_prop = (struct property*) alloc_bootmem(sizeof(struct property) + 256);
 358         if (!of_prop)
 359                 return;
 360         dn = of_find_node_by_path("/");
 361         if (dn) {
 362                 memset(of_prop, -1, sizeof(struct property) + 256);
 363                 of_prop->name = "pci-OF-bus-map";
 364                 of_prop->length = 256;
 365                 of_prop->value = &of_prop[1];
 366                 prom_add_property(dn, of_prop);
 367                 of_node_put(dn);
 368         }
 369 }
 370
 371 #else /* CONFIG_PPC_OF */
 372 void pcibios_make_OF_bus_map(void)
 373 {
 374 }
 375 #endif /* CONFIG_PPC_OF */
 376
 377 static void __devinit pcibios_scan_phb(struct pci_controller *hose)
 378 {
 379         struct pci_bus *bus;
 380         struct device_node *node = hose->dn;
 381         unsigned long io_offset;
 382         struct resource *res = &hose->io_resource;
 383
 384         pr_debug("PCI: Scanning PHB %s\n",
 385                  node ? node->full_name : "<NO NAME>");
 386
 387         /* Create an empty bus for the toplevel */
 388         bus = pci_create_bus(hose->parent, hose->first_busno, hose->ops, hose);
 389         if (bus == NULL) {
 390                 printk(KERN_ERR "Failed to create bus for PCI domain %04x\n",
 391                        hose->global_number);
 392                 return;
 393         }
 394         bus->secondary = hose->first_busno;
 395         hose->bus = bus;
 396
 397         /* Fixup IO space offset */
 398         io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
 399         res->start = (res->start + io_offset) & 0xffffffffu;
 400         res->end = (res->end + io_offset) & 0xffffffffu;
 401
 402         /* Wire up PHB bus resources */
 403         pcibios_setup_phb_resources(hose);
 404
 405         /* Scan children */
 406         hose->last_busno = bus->subordinate = pci_scan_child_bus(bus);
 407 }
 408
 409 static int __init pcibios_init(void)
 410 {
 411         struct pci_controller *hose, *tmp;
 412         int next_busno = 0;
 413
 414         printk(KERN_INFO "PCI: Probing PCI hardware\n");
 415
 416         if (ppc_pci_flags & PPC_PCI_REASSIGN_ALL_BUS)
 417                 pci_assign_all_buses = 1;
 418
 419         /* Scan all of the recorded PCI controllers.  */
 420         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 421                 if (pci_assign_all_buses)
 422                         hose->first_busno = next_busno;
 423                 hose->last_busno = 0xff;
 424                 pcibios_scan_phb(hose);
 425                 pci_bus_add_devices(hose->bus);
 426                 if (pci_assign_all_buses || next_busno <= hose->last_busno)
 427                         next_busno = hose->last_busno + pcibios_assign_bus_offset;
 428         }
 429         pci_bus_count = next_busno;
 430
 431         /* OpenFirmware based machines need a map of OF bus
 432          * numbers vs. kernel bus numbers since we may have to
 433          * remap them.
 434          */
 435         if (pci_assign_all_buses)
 436                 pcibios_make_OF_bus_map();
 437
 438         /* Call common code to handle resource allocation */
 439         pcibios_resource_survey();
 440
 441         /* Call machine dependent post-init code */
 442         if (ppc_md.pcibios_after_init)
 443                 ppc_md.pcibios_after_init();
 444
 445         return 0;
 446 }
 447
 448 subsys_initcall(pcibios_init);
 449
 450 /* the next one is stolen from the alpha port... */
 451 void __init
 452 pcibios_update_irq(struct pci_dev *dev, int irq)
 453 {
 454         pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
 455         /* XXX FIXME - update OF device tree node interrupt property */
 456 }
 457
 458 static struct pci_controller*
 459 pci_bus_to_hose(int bus)
 460 {
 461         struct pci_controller *hose, *tmp;
 462
 463         list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
 464                 if (bus >= hose->first_busno && bus <= hose->last_busno)
 465                         return hose;
 466         return NULL;
 467 }
 468
 469 /* Provide information on locations of various I/O regions in physical
 470  * memory.  Do this on a per-card basis so that we choose the right
 471  * root bridge.
 472  * Note that the returned IO or memory base is a physical address
 473  */
 474
 475 long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
 476 {
 477         struct pci_controller* hose;
 478         long result = -EOPNOTSUPP;
 479
 480         hose = pci_bus_to_hose(bus);
 481         if (!hose)
 482                 return -ENODEV;
 483
 484         switch (which) {
 485         case IOBASE_BRIDGE_NUMBER:
 486                 return (long)hose->first_busno;
 487         case IOBASE_MEMORY:
 488                 return (long)hose->pci_mem_offset;
 489         case IOBASE_IO:
 490                 return (long)hose->io_base_phys;
 491         case IOBASE_ISA_IO:
 492                 return (long)isa_io_base;
 493         case IOBASE_ISA_MEM:
 494                 return (long)isa_mem_base;
 495         }
 496
 497         return result;
 498 }
 499
 500 /*
 501  * Null PCI config access functions, for the case when we can't
 502  * find a hose.
 503  */
 504 #define NULL_PCI_OP(rw, size, type)                                     \
 505 static int                                                              \
 506 null_##rw##_config_##size(struct pci_dev *dev, int offset, type val)    \
 507 {                                                                       \
 508         return PCIBIOS_DEVICE_NOT_FOUND;                                \
 509 }
 510
 511 static int
 512 null_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
 513                  int len, u32 *val)
 514 {
 515         return PCIBIOS_DEVICE_NOT_FOUND;
 516 }
 517
 518 static int
 519 null_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
 520                   int len, u32 val)
 521 {
 522         return PCIBIOS_DEVICE_NOT_FOUND;
 523 }
 524
 525 static struct pci_ops null_pci_ops =
 526 {
 527         .read = null_read_config,
 528         .write = null_write_config,
 529 };
 530
 531 /*
 532  * These functions are used early on before PCI scanning is done
 533  * and all of the pci_dev and pci_bus structures have been created.
 534  */
 535 static struct pci_bus *
 536 fake_pci_bus(struct pci_controller *hose, int busnr)
 537 {
 538         static struct pci_bus bus;
 539
 540         if (hose == 0) {
 541                 hose = pci_bus_to_hose(busnr);
 542                 if (hose == 0)
 543                         printk(KERN_ERR "Can't find hose for PCI bus %d!\n", busnr);
 544         }
 545         bus.number = busnr;
 546         bus.sysdata = hose;
 547         bus.ops = hose? hose->ops: &null_pci_ops;
 548         return &bus;
 549 }
 550
 551 #define EARLY_PCI_OP(rw, size, type)                                    \
 552 int early_##rw##_config_##size(struct pci_controller *hose, int bus,    \
 553                                int devfn, int offset, type value)       \
 554 {                                                                       \
 555         return pci_bus_##rw##_config_##size(fake_pci_bus(hose, bus),    \
 556                                             devfn, offset, value);      \
 557 }
 558
 559 EARLY_PCI_OP(read, byte, u8 *)
 560 EARLY_PCI_OP(read, word, u16 *)
 561 EARLY_PCI_OP(read, dword, u32 *)
 562 EARLY_PCI_OP(write, byte, u8)
 563 EARLY_PCI_OP(write, word, u16)
 564 EARLY_PCI_OP(write, dword, u32)
 565
 566 extern int pci_bus_find_capability (struct pci_bus *bus, unsigned int devfn, int cap);
 567 int early_find_capability(struct pci_controller *hose, int bus, int devfn,
 568                           int cap)
 569 {
 570         return pci_bus_find_capability(fake_pci_bus(hose, bus), devfn, cap);
 571 }