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_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 static int pci_bus_count;
  47
  48 /* This will remain NULL for now, until isa-bridge.c is made common
  49  * to both 32-bit and 64-bit.
  50  */
  51 struct pci_dev *isa_bridge_pcidev;
  52 EXPORT_SYMBOL_GPL(isa_bridge_pcidev);
  53
  54 static void
  55 fixup_hide_host_resource_fsl(struct pci_dev *dev)
  56 {
  57         int i, class = dev->class >> 8;
  58
  59         if ((class == PCI_CLASS_PROCESSOR_POWERPC ||
  60              class == PCI_CLASS_BRIDGE_OTHER) &&
  61                 (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) &&
  62                 (dev->bus->parent == NULL)) {
  63                 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
  64                         dev->resource[i].start = 0;
  65                         dev->resource[i].end = 0;
  66                         dev->resource[i].flags = 0;
  67                 }
  68         }
  69 }
  70 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MOTOROLA, PCI_ANY_ID, fixup_hide_host_resource_fsl);
  71 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, fixup_hide_host_resource_fsl);
  72
  73 static void
  74 fixup_cpc710_pci64(struct pci_dev* dev)
  75 {
  76         /* Hide the PCI64 BARs from the kernel as their content doesn't
  77          * fit well in the resource management
  78          */
  79         dev->resource[0].start = dev->resource[0].end = 0;
  80         dev->resource[0].flags = 0;
  81         dev->resource[1].start = dev->resource[1].end = 0;
  82         dev->resource[1].flags = 0;
  83 }
  84 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM,     PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64);
  85
  86 #ifdef CONFIG_PPC_OF
  87 /*
  88  * Functions below are used on OpenFirmware machines.
  89  */
  90 static void
  91 make_one_node_map(struct device_node* node, u8 pci_bus)
  92 {
  93         const int *bus_range;
  94         int len;
  95
  96         if (pci_bus >= pci_bus_count)
  97                 return;
  98         bus_range = of_get_property(node, "bus-range", &len);
  99         if (bus_range == NULL || len < 2 * sizeof(int)) {
 100                 printk(KERN_WARNING "Can't get bus-range for %s, "
 101                        "assuming it starts at 0\n", node->full_name);
 102                 pci_to_OF_bus_map[pci_bus] = 0;
 103         } else
 104                 pci_to_OF_bus_map[pci_bus] = bus_range[0];
 105
 106         for_each_child_of_node(node, node) {
 107                 struct pci_dev* dev;
 108                 const unsigned int *class_code, *reg;
 109
 110                 class_code = of_get_property(node, "class-code", NULL);
 111                 if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
 112                         (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
 113                         continue;
 114                 reg = of_get_property(node, "reg", NULL);
 115                 if (!reg)
 116                         continue;
 117                 dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff));
 118                 if (!dev || !dev->subordinate) {
 119                         pci_dev_put(dev);
 120                         continue;
 121                 }
 122                 make_one_node_map(node, dev->subordinate->number);
 123                 pci_dev_put(dev);
 124         }
 125 }
 126
 127 void
 128 pcibios_make_OF_bus_map(void)
 129 {
 130         int i;
 131         struct pci_controller *hose, *tmp;
 132         struct property *map_prop;
 133         struct device_node *dn;
 134
 135         pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
 136         if (!pci_to_OF_bus_map) {
 137                 printk(KERN_ERR "Can't allocate OF bus map !\n");
 138                 return;
 139         }
 140
 141         /* We fill the bus map with invalid values, that helps
 142          * debugging.
 143          */
 144         for (i=0; i<pci_bus_count; i++)
 145                 pci_to_OF_bus_map[i] = 0xff;
 146
 147         /* For each hose, we begin searching bridges */
 148         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 149                 struct device_node* node = hose->dn;
 150
 151                 if (!node)
 152                         continue;
 153                 make_one_node_map(node, hose->first_busno);
 154         }
 155         dn = of_find_node_by_path("/");
 156         map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
 157         if (map_prop) {
 158                 BUG_ON(pci_bus_count > map_prop->length);
 159                 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
 160         }
 161         of_node_put(dn);
 162 #ifdef DEBUG
 163         printk("PCI->OF bus map:\n");
 164         for (i=0; i<pci_bus_count; i++) {
 165                 if (pci_to_OF_bus_map[i] == 0xff)
 166                         continue;
 167                 printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
 168         }
 169 #endif
 170 }
 171
 172 typedef int (*pci_OF_scan_iterator)(struct device_node* node, void* data);
 173
 174 static struct device_node*
 175 scan_OF_pci_childs(struct device_node *parent, pci_OF_scan_iterator filter, void* data)
 176 {
 177         struct device_node *node;
 178         struct device_node* sub_node;
 179
 180         for_each_child_of_node(parent, node) {
 181                 const unsigned int *class_code;
 182
 183                 if (filter(node, data)) {
 184                         of_node_put(node);
 185                         return node;
 186                 }
 187
 188                 /* For PCI<->PCI bridges or CardBus bridges, we go down
 189                  * Note: some OFs create a parent node "multifunc-device" as
 190                  * a fake root for all functions of a multi-function device,
 191                  * we go down them as well.
 192                  */
 193                 class_code = of_get_property(node, "class-code", NULL);
 194                 if ((!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
 195                         (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) &&
 196                         strcmp(node->name, "multifunc-device"))
 197                         continue;
 198                 sub_node = scan_OF_pci_childs(node, filter, data);
 199                 if (sub_node) {
 200                         of_node_put(node);
 201                         return sub_node;
 202                 }
 203         }
 204         return NULL;
 205 }
 206
 207 static struct device_node *scan_OF_for_pci_dev(struct device_node *parent,
 208                                                unsigned int devfn)
 209 {
 210         struct device_node *np, *cnp;
 211         const u32 *reg;
 212         unsigned int psize;
 213
 214         for_each_child_of_node(parent, np) {
 215                 reg = of_get_property(np, "reg", &psize);
 216                 if (reg && psize >= 4 && ((reg[0] >> 8) & 0xff) == devfn)
 217                         return np;
 218
 219                 /* Note: some OFs create a parent node "multifunc-device" as
 220                  * a fake root for all functions of a multi-function device,
 221                  * we go down them as well. */
 222                 if (!strcmp(np->name, "multifunc-device")) {
 223                         cnp = scan_OF_for_pci_dev(np, devfn);
 224                         if (cnp)
 225                                 return cnp;
 226                 }
 227         }
 228         return NULL;
 229 }
 230
 231
 232 static struct device_node *scan_OF_for_pci_bus(struct pci_bus *bus)
 233 {
 234         struct device_node *parent, *np;
 235
 236         /* Are we a root bus ? */
 237         if (bus->self == NULL || bus->parent == NULL) {
 238                 struct pci_controller *hose = pci_bus_to_host(bus);
 239                 if (hose == NULL)
 240                         return NULL;
 241                 return of_node_get(hose->dn);
 242         }
 243
 244         /* not a root bus, we need to get our parent */
 245         parent = scan_OF_for_pci_bus(bus->parent);
 246         if (parent == NULL)
 247                 return NULL;
 248
 249         /* now iterate for children for a match */
 250         np = scan_OF_for_pci_dev(parent, bus->self->devfn);
 251         of_node_put(parent);
 252
 253         return np;
 254 }
 255
 256 /*
 257  * Scans the OF tree for a device node matching a PCI device
 258  */
 259 struct device_node *
 260 pci_busdev_to_OF_node(struct pci_bus *bus, int devfn)
 261 {
 262         struct device_node *parent, *np;
 263
 264         pr_debug("pci_busdev_to_OF_node(%d,0x%x)\n", bus->number, devfn);
 265         parent = scan_OF_for_pci_bus(bus);
 266         if (parent == NULL)
 267                 return NULL;
 268         pr_debug(" parent is %s\n", parent ? parent->full_name : "<NULL>");
 269         np = scan_OF_for_pci_dev(parent, devfn);
 270         of_node_put(parent);
 271         pr_debug(" result is %s\n", np ? np->full_name : "<NULL>");
 272
 273         /* XXX most callers don't release the returned node
 274          * mostly because ppc64 doesn't increase the refcount,
 275          * we need to fix that.
 276          */
 277         return np;
 278 }
 279 EXPORT_SYMBOL(pci_busdev_to_OF_node);
 280
 281 struct device_node*
 282 pci_device_to_OF_node(struct pci_dev *dev)
 283 {
 284         return pci_busdev_to_OF_node(dev->bus, dev->devfn);
 285 }
 286 EXPORT_SYMBOL(pci_device_to_OF_node);
 287
 288 static int
 289 find_OF_pci_device_filter(struct device_node* node, void* data)
 290 {
 291         return ((void *)node == data);
 292 }
 293
 294 /*
 295  * Returns the PCI device matching a given OF node
 296  */
 297 int
 298 pci_device_from_OF_node(struct device_node* node, u8* bus, u8* devfn)
 299 {
 300         const unsigned int *reg;
 301         struct pci_controller* hose;
 302         struct pci_dev* dev = NULL;
 303
 304         /* Make sure it's really a PCI device */
 305         hose = pci_find_hose_for_OF_device(node);
 306         if (!hose || !hose->dn)
 307                 return -ENODEV;
 308         if (!scan_OF_pci_childs(hose->dn,
 309                         find_OF_pci_device_filter, (void *)node))
 310                 return -ENODEV;
 311         reg = of_get_property(node, "reg", NULL);
 312         if (!reg)
 313                 return -ENODEV;
 314         *bus = (reg[0] >> 16) & 0xff;
 315         *devfn = ((reg[0] >> 8) & 0xff);
 316
 317         /* Ok, here we need some tweak. If we have already renumbered
 318          * all busses, we can't rely on the OF bus number any more.
 319          * the pci_to_OF_bus_map is not enough as several PCI busses
 320          * may match the same OF bus number.
 321          */
 322         if (!pci_to_OF_bus_map)
 323                 return 0;
 324
 325         for_each_pci_dev(dev)
 326                 if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
 327                                 dev->devfn == *devfn) {
 328                         *bus = dev->bus->number;
 329                         pci_dev_put(dev);
 330                         return 0;
 331                 }
 332
 333         return -ENODEV;
 334 }
 335 EXPORT_SYMBOL(pci_device_from_OF_node);
 336
 337 /* We create the "pci-OF-bus-map" property now so it appears in the
 338  * /proc device tree
 339  */
 340 void __init
 341 pci_create_OF_bus_map(void)
 342 {
 343         struct property* of_prop;
 344         struct device_node *dn;
 345
 346         of_prop = (struct property*) alloc_bootmem(sizeof(struct property) + 256);
 347         if (!of_prop)
 348                 return;
 349         dn = of_find_node_by_path("/");
 350         if (dn) {
 351                 memset(of_prop, -1, sizeof(struct property) + 256);
 352                 of_prop->name = "pci-OF-bus-map";
 353                 of_prop->length = 256;
 354                 of_prop->value = &of_prop[1];
 355                 prom_add_property(dn, of_prop);
 356                 of_node_put(dn);
 357         }
 358 }
 359
 360 #else /* CONFIG_PPC_OF */
 361 void pcibios_make_OF_bus_map(void)
 362 {
 363 }
 364 #endif /* CONFIG_PPC_OF */
 365
 366 static void __devinit pcibios_scan_phb(struct pci_controller *hose)
 367 {
 368         struct pci_bus *bus;
 369         struct device_node *node = hose->dn;
 370         unsigned long io_offset;
 371         struct resource *res = &hose->io_resource;
 372
 373         pr_debug("PCI: Scanning PHB %s\n",
 374                  node ? node->full_name : "<NO NAME>");
 375
 376         /* Create an empty bus for the toplevel */
 377         bus = pci_create_bus(hose->parent, hose->first_busno, hose->ops, hose);
 378         if (bus == NULL) {
 379                 printk(KERN_ERR "Failed to create bus for PCI domain %04x\n",
 380                        hose->global_number);
 381                 return;
 382         }
 383         bus->secondary = hose->first_busno;
 384         hose->bus = bus;
 385
 386         /* Fixup IO space offset */
 387         io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
 388         res->start = (res->start + io_offset) & 0xffffffffu;
 389         res->end = (res->end + io_offset) & 0xffffffffu;
 390
 391         /* Wire up PHB bus resources */
 392         pcibios_setup_phb_resources(hose);
 393
 394         /* Scan children */
 395         hose->last_busno = bus->subordinate = pci_scan_child_bus(bus);
 396 }
 397
 398 static int __init pcibios_init(void)
 399 {
 400         struct pci_controller *hose, *tmp;
 401         int next_busno = 0;
 402
 403         printk(KERN_INFO "PCI: Probing PCI hardware\n");
 404
 405         if (ppc_pci_flags & PPC_PCI_REASSIGN_ALL_BUS)
 406                 pci_assign_all_buses = 1;
 407
 408         /* Scan all of the recorded PCI controllers.  */
 409         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 410                 if (pci_assign_all_buses)
 411                         hose->first_busno = next_busno;
 412                 hose->last_busno = 0xff;
 413                 pcibios_scan_phb(hose);
 414                 pci_bus_add_devices(hose->bus);
 415                 if (pci_assign_all_buses || next_busno <= hose->last_busno)
 416                         next_busno = hose->last_busno + pcibios_assign_bus_offset;
 417         }
 418         pci_bus_count = next_busno;
 419
 420         /* OpenFirmware based machines need a map of OF bus
 421          * numbers vs. kernel bus numbers since we may have to
 422          * remap them.
 423          */
 424         if (pci_assign_all_buses)
 425                 pcibios_make_OF_bus_map();
 426
 427         /* Call common code to handle resource allocation */
 428         pcibios_resource_survey();
 429
 430         /* Call machine dependent post-init code */
 431         if (ppc_md.pcibios_after_init)
 432                 ppc_md.pcibios_after_init();
 433
 434         return 0;
 435 }
 436
 437 subsys_initcall(pcibios_init);
 438
 439 static struct pci_controller*
 440 pci_bus_to_hose(int bus)
 441 {
 442         struct pci_controller *hose, *tmp;
 443
 444         list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
 445                 if (bus >= hose->first_busno && bus <= hose->last_busno)
 446                         return hose;
 447         return NULL;
 448 }
 449
 450 /* Provide information on locations of various I/O regions in physical
 451  * memory.  Do this on a per-card basis so that we choose the right
 452  * root bridge.
 453  * Note that the returned IO or memory base is a physical address
 454  */
 455
 456 long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
 457 {
 458         struct pci_controller* hose;
 459         long result = -EOPNOTSUPP;
 460
 461         hose = pci_bus_to_hose(bus);
 462         if (!hose)
 463                 return -ENODEV;
 464
 465         switch (which) {
 466         case IOBASE_BRIDGE_NUMBER:
 467                 return (long)hose->first_busno;
 468         case IOBASE_MEMORY:
 469                 return (long)hose->pci_mem_offset;
 470         case IOBASE_IO:
 471                 return (long)hose->io_base_phys;
 472         case IOBASE_ISA_IO:
 473                 return (long)isa_io_base;
 474         case IOBASE_ISA_MEM:
 475                 return (long)isa_mem_base;
 476         }
 477
 478         return result;
 479 }
 480
 481 /*
 482  * Null PCI config access functions, for the case when we can't
 483  * find a hose.
 484  */
 485 #define NULL_PCI_OP(rw, size, type)                                     \
 486 static int                                                              \
 487 null_##rw##_config_##size(struct pci_dev *dev, int offset, type val)    \
 488 {                                                                       \
 489         return PCIBIOS_DEVICE_NOT_FOUND;                                \
 490 }
 491
 492 static int
 493 null_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
 494                  int len, u32 *val)
 495 {
 496         return PCIBIOS_DEVICE_NOT_FOUND;
 497 }
 498
 499 static int
 500 null_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
 501                   int len, u32 val)
 502 {
 503         return PCIBIOS_DEVICE_NOT_FOUND;
 504 }
 505
 506 static struct pci_ops null_pci_ops =
 507 {
 508         .read = null_read_config,
 509         .write = null_write_config,
 510 };
 511
 512 /*
 513  * These functions are used early on before PCI scanning is done
 514  * and all of the pci_dev and pci_bus structures have been created.
 515  */
 516 static struct pci_bus *
 517 fake_pci_bus(struct pci_controller *hose, int busnr)
 518 {
 519         static struct pci_bus bus;
 520
 521         if (hose == 0) {
 522                 hose = pci_bus_to_hose(busnr);
 523                 if (hose == 0)
 524                         printk(KERN_ERR "Can't find hose for PCI bus %d!\n", busnr);
 525         }
 526         bus.number = busnr;
 527         bus.sysdata = hose;
 528         bus.ops = hose? hose->ops: &null_pci_ops;
 529         return &bus;
 530 }
 531
 532 #define EARLY_PCI_OP(rw, size, type)                                    \
 533 int early_##rw##_config_##size(struct pci_controller *hose, int bus,    \
 534                                int devfn, int offset, type value)       \
 535 {                                                                       \
 536         return pci_bus_##rw##_config_##size(fake_pci_bus(hose, bus),    \
 537                                             devfn, offset, value);      \
 538 }
 539
 540 EARLY_PCI_OP(read, byte, u8 *)
 541 EARLY_PCI_OP(read, word, u16 *)
 542 EARLY_PCI_OP(read, dword, u32 *)
 543 EARLY_PCI_OP(write, byte, u8)
 544 EARLY_PCI_OP(write, word, u16)
 545 EARLY_PCI_OP(write, dword, u32)
 546
 547 extern int pci_bus_find_capability (struct pci_bus *bus, unsigned int devfn, int cap);
 548 int early_find_capability(struct pci_controller *hose, int bus, int devfn,
 549                           int cap)
 550 {
 551         return pci_bus_find_capability(fake_pci_bus(hose, bus), devfn, cap);
 552 }