arch/sparc64/kernel/of_device.c

   1 #include <linux/string.h>
   2 #include <linux/kernel.h>
   3 #include <linux/init.h>
   4 #include <linux/module.h>
   5 #include <linux/mod_devicetable.h>
   6 #include <linux/slab.h>
   7
   8 #include <asm/errno.h>
   9 #include <asm/of_device.h>
  10
  11 /**
  12  * of_match_device - Tell if an of_device structure has a matching
  13  * of_match structure
  14  * @ids: array of of device match structures to search in
  15  * @dev: the of device structure to match against
  16  *
  17  * Used by a driver to check whether an of_device present in the
  18  * system is in its list of supported devices.
  19  */
  20 const struct of_device_id *of_match_device(const struct of_device_id *matches,
  21                                         const struct of_device *dev)
  22 {
  23         if (!dev->node)
  24                 return NULL;
  25         while (matches->name[0] || matches->type[0] || matches->compatible[0]) {
  26                 int match = 1;
  27                 if (matches->name[0])
  28                         match &= dev->node->name
  29                                 && !strcmp(matches->name, dev->node->name);
  30                 if (matches->type[0])
  31                         match &= dev->node->type
  32                                 && !strcmp(matches->type, dev->node->type);
  33                 if (matches->compatible[0])
  34                         match &= of_device_is_compatible(dev->node,
  35                                                          matches->compatible);
  36                 if (match)
  37                         return matches;
  38                 matches++;
  39         }
  40         return NULL;
  41 }
  42
  43 static int of_platform_bus_match(struct device *dev, struct device_driver *drv)
  44 {
  45         struct of_device * of_dev = to_of_device(dev);
  46         struct of_platform_driver * of_drv = to_of_platform_driver(drv);
  47         const struct of_device_id * matches = of_drv->match_table;
  48
  49         if (!matches)
  50                 return 0;
  51
  52         return of_match_device(matches, of_dev) != NULL;
  53 }
  54
  55 struct of_device *of_dev_get(struct of_device *dev)
  56 {
  57         struct device *tmp;
  58
  59         if (!dev)
  60                 return NULL;
  61         tmp = get_device(&dev->dev);
  62         if (tmp)
  63                 return to_of_device(tmp);
  64         else
  65                 return NULL;
  66 }
  67
  68 void of_dev_put(struct of_device *dev)
  69 {
  70         if (dev)
  71                 put_device(&dev->dev);
  72 }
  73
  74
  75 static int of_device_probe(struct device *dev)
  76 {
  77         int error = -ENODEV;
  78         struct of_platform_driver *drv;
  79         struct of_device *of_dev;
  80         const struct of_device_id *match;
  81
  82         drv = to_of_platform_driver(dev->driver);
  83         of_dev = to_of_device(dev);
  84
  85         if (!drv->probe)
  86                 return error;
  87
  88         of_dev_get(of_dev);
  89
  90         match = of_match_device(drv->match_table, of_dev);
  91         if (match)
  92                 error = drv->probe(of_dev, match);
  93         if (error)
  94                 of_dev_put(of_dev);
  95
  96         return error;
  97 }
  98
  99 static int of_device_remove(struct device *dev)
 100 {
 101         struct of_device * of_dev = to_of_device(dev);
 102         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
 103
 104         if (dev->driver && drv->remove)
 105                 drv->remove(of_dev);
 106         return 0;
 107 }
 108
 109 static int of_device_suspend(struct device *dev, pm_message_t state)
 110 {
 111         struct of_device * of_dev = to_of_device(dev);
 112         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
 113         int error = 0;
 114
 115         if (dev->driver && drv->suspend)
 116                 error = drv->suspend(of_dev, state);
 117         return error;
 118 }
 119
 120 static int of_device_resume(struct device * dev)
 121 {
 122         struct of_device * of_dev = to_of_device(dev);
 123         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
 124         int error = 0;
 125
 126         if (dev->driver && drv->resume)
 127                 error = drv->resume(of_dev);
 128         return error;
 129 }
 130
 131 void __iomem *of_ioremap(struct resource *res, unsigned long offset, unsigned long size, char *name)
 132 {
 133         unsigned long ret = res->start + offset;
 134
 135         if (!request_region(ret, size, name))
 136                 ret = 0;
 137
 138         return (void __iomem *) ret;
 139 }
 140 EXPORT_SYMBOL(of_ioremap);
 141
 142 void of_iounmap(void __iomem *base, unsigned long size)
 143 {
 144         release_region((unsigned long) base, size);
 145 }
 146 EXPORT_SYMBOL(of_iounmap);
 147
 148 static int node_match(struct device *dev, void *data)
 149 {
 150         struct of_device *op = to_of_device(dev);
 151         struct device_node *dp = data;
 152
 153         return (op->node == dp);
 154 }
 155
 156 struct of_device *of_find_device_by_node(struct device_node *dp)
 157 {
 158         struct device *dev = bus_find_device(&of_bus_type, NULL,
 159                                              dp, node_match);
 160
 161         if (dev)
 162                 return to_of_device(dev);
 163
 164         return NULL;
 165 }
 166 EXPORT_SYMBOL(of_find_device_by_node);
 167
 168 #ifdef CONFIG_PCI
 169 struct bus_type isa_bus_type = {
 170        .name    = "isa",
 171        .match   = of_platform_bus_match,
 172        .probe   = of_device_probe,
 173        .remove  = of_device_remove,
 174        .suspend = of_device_suspend,
 175        .resume  = of_device_resume,
 176 };
 177 EXPORT_SYMBOL(isa_bus_type);
 178
 179 struct bus_type ebus_bus_type = {
 180        .name    = "ebus",
 181        .match   = of_platform_bus_match,
 182        .probe   = of_device_probe,
 183        .remove  = of_device_remove,
 184        .suspend = of_device_suspend,
 185        .resume  = of_device_resume,
 186 };
 187 EXPORT_SYMBOL(ebus_bus_type);
 188 #endif
 189
 190 #ifdef CONFIG_SBUS
 191 struct bus_type sbus_bus_type = {
 192        .name    = "sbus",
 193        .match   = of_platform_bus_match,
 194        .probe   = of_device_probe,
 195        .remove  = of_device_remove,
 196        .suspend = of_device_suspend,
 197        .resume  = of_device_resume,
 198 };
 199 EXPORT_SYMBOL(sbus_bus_type);
 200 #endif
 201
 202 struct bus_type of_bus_type = {
 203        .name    = "of",
 204        .match   = of_platform_bus_match,
 205        .probe   = of_device_probe,
 206        .remove  = of_device_remove,
 207        .suspend = of_device_suspend,
 208        .resume  = of_device_resume,
 209 };
 210 EXPORT_SYMBOL(of_bus_type);
 211
 212 static inline u64 of_read_addr(const u32 *cell, int size)
 213 {
 214         u64 r = 0;
 215         while (size--)
 216                 r = (r << 32) | *(cell++);
 217         return r;
 218 }
 219
 220 static void __init get_cells(struct device_node *dp,
 221                              int *addrc, int *sizec)
 222 {
 223         if (addrc)
 224                 *addrc = of_n_addr_cells(dp);
 225         if (sizec)
 226                 *sizec = of_n_size_cells(dp);
 227 }
 228
 229 /* Max address size we deal with */
 230 #define OF_MAX_ADDR_CELLS       4
 231
 232 struct of_bus {
 233         const char      *name;
 234         const char      *addr_prop_name;
 235         int             (*match)(struct device_node *parent);
 236         void            (*count_cells)(struct device_node *child,
 237                                        int *addrc, int *sizec);
 238         int             (*map)(u32 *addr, const u32 *range,
 239                                int na, int ns, int pna);
 240         unsigned int    (*get_flags)(u32 *addr);
 241 };
 242
 243 /*
 244  * Default translator (generic bus)
 245  */
 246
 247 static void of_bus_default_count_cells(struct device_node *dev,
 248                                        int *addrc, int *sizec)
 249 {
 250         get_cells(dev, addrc, sizec);
 251 }
 252
 253 /* Make sure the least significant 64-bits are in-range.  Even
 254  * for 3 or 4 cell values it is a good enough approximation.
 255  */
 256 static int of_out_of_range(const u32 *addr, const u32 *base,
 257                            const u32 *size, int na, int ns)
 258 {
 259         u64 a = of_read_addr(addr, na);
 260         u64 b = of_read_addr(base, na);
 261
 262         if (a < b)
 263                 return 1;
 264
 265         b += of_read_addr(size, ns);
 266         if (a >= b)
 267                 return 1;
 268
 269         return 0;
 270 }
 271
 272 static int of_bus_default_map(u32 *addr, const u32 *range,
 273                               int na, int ns, int pna)
 274 {
 275         u32 result[OF_MAX_ADDR_CELLS];
 276         int i;
 277
 278         if (ns > 2) {
 279                 printk("of_device: Cannot handle size cells (%d) > 2.", ns);
 280                 return -EINVAL;
 281         }
 282
 283         if (of_out_of_range(addr, range, range + na + pna, na, ns))
 284                 return -EINVAL;
 285
 286         /* Start with the parent range base.  */
 287         memcpy(result, range + na, pna * 4);
 288
 289         /* Add in the child address offset.  */
 290         for (i = 0; i < na; i++)
 291                 result[pna - 1 - i] +=
 292                         (addr[na - 1 - i] -
 293                          range[na - 1 - i]);
 294
 295         memcpy(addr, result, pna * 4);
 296
 297         return 0;
 298 }
 299
 300 static unsigned int of_bus_default_get_flags(u32 *addr)
 301 {
 302         return IORESOURCE_MEM;
 303 }
 304
 305 /*
 306  * PCI bus specific translator
 307  */
 308
 309 static int of_bus_pci_match(struct device_node *np)
 310 {
 311         if (!strcmp(np->type, "pci") || !strcmp(np->type, "pciex")) {
 312                 /* Do not do PCI specific frobbing if the
 313                  * PCI bridge lacks a ranges property.  We
 314                  * want to pass it through up to the next
 315                  * parent as-is, not with the PCI translate
 316                  * method which chops off the top address cell.
 317                  */
 318                 if (!of_find_property(np, "ranges", NULL))
 319                         return 0;
 320
 321                 return 1;
 322         }
 323
 324         return 0;
 325 }
 326
 327 static void of_bus_pci_count_cells(struct device_node *np,
 328                                    int *addrc, int *sizec)
 329 {
 330         if (addrc)
 331                 *addrc = 3;
 332         if (sizec)
 333                 *sizec = 2;
 334 }
 335
 336 static int of_bus_pci_map(u32 *addr, const u32 *range,
 337                           int na, int ns, int pna)
 338 {
 339         u32 result[OF_MAX_ADDR_CELLS];
 340         int i;
 341
 342         /* Check address type match */
 343         if ((addr[0] ^ range[0]) & 0x03000000)
 344                 return -EINVAL;
 345
 346         if (of_out_of_range(addr + 1, range + 1, range + na + pna,
 347                             na - 1, ns))
 348                 return -EINVAL;
 349
 350         /* Start with the parent range base.  */
 351         memcpy(result, range + na, pna * 4);
 352
 353         /* Add in the child address offset, skipping high cell.  */
 354         for (i = 0; i < na - 1; i++)
 355                 result[pna - 1 - i] +=
 356                         (addr[na - 1 - i] -
 357                          range[na - 1 - i]);
 358
 359         memcpy(addr, result, pna * 4);
 360
 361         return 0;
 362 }
 363
 364 static unsigned int of_bus_pci_get_flags(u32 *addr)
 365 {
 366         unsigned int flags = 0;
 367         u32 w = addr[0];
 368
 369         switch((w >> 24) & 0x03) {
 370         case 0x01:
 371                 flags |= IORESOURCE_IO;
 372         case 0x02: /* 32 bits */
 373         case 0x03: /* 64 bits */
 374                 flags |= IORESOURCE_MEM;
 375         }
 376         if (w & 0x40000000)
 377                 flags |= IORESOURCE_PREFETCH;
 378         return flags;
 379 }
 380
 381 /*
 382  * SBUS bus specific translator
 383  */
 384
 385 static int of_bus_sbus_match(struct device_node *np)
 386 {
 387         return !strcmp(np->name, "sbus") ||
 388                 !strcmp(np->name, "sbi");
 389 }
 390
 391 static void of_bus_sbus_count_cells(struct device_node *child,
 392                                    int *addrc, int *sizec)
 393 {
 394         if (addrc)
 395                 *addrc = 2;
 396         if (sizec)
 397                 *sizec = 1;
 398 }
 399
 400 static int of_bus_sbus_map(u32 *addr, const u32 *range, int na, int ns, int pna)
 401 {
 402         return of_bus_default_map(addr, range, na, ns, pna);
 403 }
 404
 405 static unsigned int of_bus_sbus_get_flags(u32 *addr)
 406 {
 407         return IORESOURCE_MEM;
 408 }
 409
 410
 411 /*
 412  * Array of bus specific translators
 413  */
 414
 415 static struct of_bus of_busses[] = {
 416         /* PCI */
 417         {
 418                 .name = "pci",
 419                 .addr_prop_name = "assigned-addresses",
 420                 .match = of_bus_pci_match,
 421                 .count_cells = of_bus_pci_count_cells,
 422                 .map = of_bus_pci_map,
 423                 .get_flags = of_bus_pci_get_flags,
 424         },
 425         /* SBUS */
 426         {
 427                 .name = "sbus",
 428                 .addr_prop_name = "reg",
 429                 .match = of_bus_sbus_match,
 430                 .count_cells = of_bus_sbus_count_cells,
 431                 .map = of_bus_sbus_map,
 432                 .get_flags = of_bus_sbus_get_flags,
 433         },
 434         /* Default */
 435         {
 436                 .name = "default",
 437                 .addr_prop_name = "reg",
 438                 .match = NULL,
 439                 .count_cells = of_bus_default_count_cells,
 440                 .map = of_bus_default_map,
 441                 .get_flags = of_bus_default_get_flags,
 442         },
 443 };
 444
 445 static struct of_bus *of_match_bus(struct device_node *np)
 446 {
 447         int i;
 448
 449         for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
 450                 if (!of_busses[i].match || of_busses[i].match(np))
 451                         return &of_busses[i];
 452         BUG();
 453         return NULL;
 454 }
 455
 456 static int __init build_one_resource(struct device_node *parent,
 457                                      struct of_bus *bus,
 458                                      struct of_bus *pbus,
 459                                      u32 *addr,
 460                                      int na, int ns, int pna)
 461 {
 462         u32 *ranges;
 463         unsigned int rlen;
 464         int rone;
 465
 466         ranges = of_get_property(parent, "ranges", &rlen);
 467         if (ranges == NULL || rlen == 0) {
 468                 u32 result[OF_MAX_ADDR_CELLS];
 469                 int i;
 470
 471                 memset(result, 0, pna * 4);
 472                 for (i = 0; i < na; i++)
 473                         result[pna - 1 - i] =
 474                                 addr[na - 1 - i];
 475
 476                 memcpy(addr, result, pna * 4);
 477                 return 0;
 478         }
 479
 480         /* Now walk through the ranges */
 481         rlen /= 4;
 482         rone = na + pna + ns;
 483         for (; rlen >= rone; rlen -= rone, ranges += rone) {
 484                 if (!bus->map(addr, ranges, na, ns, pna))
 485                         return 0;
 486         }
 487
 488         return 1;
 489 }
 490
 491 static int __init use_1to1_mapping(struct device_node *pp)
 492 {
 493         char *model;
 494
 495         /* If this is on the PMU bus, don't try to translate it even
 496          * if a ranges property exists.
 497          */
 498         if (!strcmp(pp->name, "pmu"))
 499                 return 1;
 500
 501         /* If we have a ranges property in the parent, use it.  */
 502         if (of_find_property(pp, "ranges", NULL) != NULL)
 503                 return 0;
 504
 505         /* If the parent is the dma node of an ISA bus, pass
 506          * the translation up to the root.
 507          */
 508         if (!strcmp(pp->name, "dma"))
 509                 return 0;
 510
 511         /* Similarly for Simba PCI bridges.  */
 512         model = of_get_property(pp, "model", NULL);
 513         if (model && !strcmp(model, "SUNW,simba"))
 514                 return 0;
 515
 516         return 1;
 517 }
 518
 519 static int of_resource_verbose;
 520
 521 static void __init build_device_resources(struct of_device *op,
 522                                           struct device *parent)
 523 {
 524         struct of_device *p_op;
 525         struct of_bus *bus;
 526         int na, ns;
 527         int index, num_reg;
 528         void *preg;
 529
 530         if (!parent)
 531                 return;
 532
 533         p_op = to_of_device(parent);
 534         bus = of_match_bus(p_op->node);
 535         bus->count_cells(op->node, &na, &ns);
 536
 537         preg = of_get_property(op->node, bus->addr_prop_name, &num_reg);
 538         if (!preg || num_reg == 0)
 539                 return;
 540
 541         /* Convert to num-cells.  */
 542         num_reg /= 4;
 543
 544         /* Convert to num-entries.  */
 545         num_reg /= na + ns;
 546
 547         /* Prevent overruning the op->resources[] array.  */
 548         if (num_reg > PROMREG_MAX) {
 549                 printk(KERN_WARNING "%s: Too many regs (%d), "
 550                        "limiting to %d.\n",
 551                        op->node->full_name, num_reg, PROMREG_MAX);
 552                 num_reg = PROMREG_MAX;
 553         }
 554
 555         for (index = 0; index < num_reg; index++) {
 556                 struct resource *r = &op->resource[index];
 557                 u32 addr[OF_MAX_ADDR_CELLS];
 558                 u32 *reg = (preg + (index * ((na + ns) * 4)));
 559                 struct device_node *dp = op->node;
 560                 struct device_node *pp = p_op->node;
 561                 struct of_bus *pbus;
 562                 u64 size, result = OF_BAD_ADDR;
 563                 unsigned long flags;
 564                 int dna, dns;
 565                 int pna, pns;
 566
 567                 size = of_read_addr(reg + na, ns);
 568                 flags = bus->get_flags(reg);
 569
 570                 memcpy(addr, reg, na * 4);
 571
 572                 if (use_1to1_mapping(pp)) {
 573                         result = of_read_addr(addr, na);
 574                         goto build_res;
 575                 }
 576
 577                 dna = na;
 578                 dns = ns;
 579
 580                 while (1) {
 581                         dp = pp;
 582                         pp = dp->parent;
 583                         if (!pp) {
 584                                 result = of_read_addr(addr, dna);
 585                                 break;
 586                         }
 587
 588                         pbus = of_match_bus(pp);
 589                         pbus->count_cells(dp, &pna, &pns);
 590
 591                         if (build_one_resource(dp, bus, pbus, addr,
 592                                                dna, dns, pna))
 593                                 break;
 594
 595                         dna = pna;
 596                         dns = pns;
 597                         bus = pbus;
 598                 }
 599
 600         build_res:
 601                 memset(r, 0, sizeof(*r));
 602
 603                 if (of_resource_verbose)
 604                         printk("%s reg[%d] -> %lx\n",
 605                                op->node->full_name, index,
 606                                result);
 607
 608                 if (result != OF_BAD_ADDR) {
 609                         if (tlb_type == hypervisor)
 610                                 result &= 0x0fffffffffffffffUL;
 611
 612                         r->start = result;
 613                         r->end = result + size - 1;
 614                         r->flags = flags;
 615                 } else {
 616                         r->start = ~0UL;
 617                         r->end = ~0UL;
 618                 }
 619                 r->name = op->node->name;
 620         }
 621 }
 622
 623 static struct device_node * __init
 624 apply_interrupt_map(struct device_node *dp, struct device_node *pp,
 625                     u32 *imap, int imlen, u32 *imask,
 626                     unsigned int *irq_p)
 627 {
 628         struct device_node *cp;
 629         unsigned int irq = *irq_p;
 630         struct of_bus *bus;
 631         phandle handle;
 632         u32 *reg;
 633         int na, num_reg, i;
 634
 635         bus = of_match_bus(pp);
 636         bus->count_cells(dp, &na, NULL);
 637
 638         reg = of_get_property(dp, "reg", &num_reg);
 639         if (!reg || !num_reg)
 640                 return NULL;
 641
 642         imlen /= ((na + 3) * 4);
 643         handle = 0;
 644         for (i = 0; i < imlen; i++) {
 645                 int j;
 646
 647                 for (j = 0; j < na; j++) {
 648                         if ((reg[j] & imask[j]) != imap[j])
 649                                 goto next;
 650                 }
 651                 if (imap[na] == irq) {
 652                         handle = imap[na + 1];
 653                         irq = imap[na + 2];
 654                         break;
 655                 }
 656
 657         next:
 658                 imap += (na + 3);
 659         }
 660         if (i == imlen) {
 661                 /* Psycho and Sabre PCI controllers can have 'interrupt-map'
 662                  * properties that do not include the on-board device
 663                  * interrupts.  Instead, the device's 'interrupts' property
 664                  * is already a fully specified INO value.
 665                  *
 666                  * Handle this by deciding that, if we didn't get a
 667                  * match in the parent's 'interrupt-map', and the
 668                  * parent is an IRQ translater, then use the parent as
 669                  * our IRQ controller.
 670                  */
 671                 if (pp->irq_trans)
 672                         return pp;
 673
 674                 return NULL;
 675         }
 676
 677         *irq_p = irq;
 678         cp = of_find_node_by_phandle(handle);
 679
 680         return cp;
 681 }
 682
 683 static unsigned int __init pci_irq_swizzle(struct device_node *dp,
 684                                            struct device_node *pp,
 685                                            unsigned int irq)
 686 {
 687         struct linux_prom_pci_registers *regs;
 688         unsigned int devfn, slot, ret;
 689
 690         if (irq < 1 || irq > 4)
 691                 return irq;
 692
 693         regs = of_get_property(dp, "reg", NULL);
 694         if (!regs)
 695                 return irq;
 696
 697         devfn = (regs->phys_hi >> 8) & 0xff;
 698         slot = (devfn >> 3) & 0x1f;
 699
 700         ret = ((irq - 1 + (slot & 3)) & 3) + 1;
 701
 702         return ret;
 703 }
 704
 705 static int of_irq_verbose;
 706
 707 static unsigned int __init build_one_device_irq(struct of_device *op,
 708                                                 struct device *parent,
 709                                                 unsigned int irq)
 710 {
 711         struct device_node *dp = op->node;
 712         struct device_node *pp, *ip;
 713         unsigned int orig_irq = irq;
 714
 715         if (irq == 0xffffffff)
 716                 return irq;
 717
 718         if (dp->irq_trans) {
 719                 irq = dp->irq_trans->irq_build(dp, irq,
 720                                                dp->irq_trans->data);
 721
 722                 if (of_irq_verbose)
 723                         printk("%s: direct translate %x --> %x\n",
 724                                dp->full_name, orig_irq, irq);
 725
 726                 return irq;
 727         }
 728
 729         /* Something more complicated.  Walk up to the root, applying
 730          * interrupt-map or bus specific translations, until we hit
 731          * an IRQ translator.
 732          *
 733          * If we hit a bus type or situation we cannot handle, we
 734          * stop and assume that the original IRQ number was in a
 735          * format which has special meaning to it's immediate parent.
 736          */
 737         pp = dp->parent;
 738         ip = NULL;
 739         while (pp) {
 740                 void *imap, *imsk;
 741                 int imlen;
 742
 743                 imap = of_get_property(pp, "interrupt-map", &imlen);
 744                 imsk = of_get_property(pp, "interrupt-map-mask", NULL);
 745                 if (imap && imsk) {
 746                         struct device_node *iret;
 747                         int this_orig_irq = irq;
 748
 749                         iret = apply_interrupt_map(dp, pp,
 750                                                    imap, imlen, imsk,
 751                                                    &irq);
 752
 753                         if (of_irq_verbose)
 754                                 printk("%s: Apply [%s:%x] imap --> [%s:%x]\n",
 755                                        op->node->full_name,
 756                                        pp->full_name, this_orig_irq,
 757                                        (iret ? iret->full_name : "NULL"), irq);
 758
 759                         if (!iret)
 760                                 break;
 761
 762                         if (iret->irq_trans) {
 763                                 ip = iret;
 764                                 break;
 765                         }
 766                 } else {
 767                         if (!strcmp(pp->type, "pci") ||
 768                             !strcmp(pp->type, "pciex")) {
 769                                 unsigned int this_orig_irq = irq;
 770
 771                                 irq = pci_irq_swizzle(dp, pp, irq);
 772                                 if (of_irq_verbose)
 773                                         printk("%s: PCI swizzle [%s] "
 774                                                "%x --> %x\n",
 775                                                op->node->full_name,
 776                                                pp->full_name, this_orig_irq,
 777                                                irq);
 778
 779                         }
 780
 781                         if (pp->irq_trans) {
 782                                 ip = pp;
 783                                 break;
 784                         }
 785                 }
 786                 dp = pp;
 787                 pp = pp->parent;
 788         }
 789         if (!ip)
 790                 return orig_irq;
 791
 792         irq = ip->irq_trans->irq_build(op->node, irq,
 793                                        ip->irq_trans->data);
 794         if (of_irq_verbose)
 795                 printk("%s: Apply IRQ trans [%s] %x --> %x\n",
 796                        op->node->full_name, ip->full_name, orig_irq, irq);
 797
 798         return irq;
 799 }
 800
 801 static struct of_device * __init scan_one_device(struct device_node *dp,
 802                                                  struct device *parent)
 803 {
 804         struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
 805         unsigned int *irq;
 806         int len, i;
 807
 808         if (!op)
 809                 return NULL;
 810
 811         op->node = dp;
 812
 813         op->clock_freq = of_getintprop_default(dp, "clock-frequency",
 814                                                (25*1000*1000));
 815         op->portid = of_getintprop_default(dp, "upa-portid", -1);
 816         if (op->portid == -1)
 817                 op->portid = of_getintprop_default(dp, "portid", -1);
 818
 819         irq = of_get_property(dp, "interrupts", &len);
 820         if (irq) {
 821                 memcpy(op->irqs, irq, len);
 822                 op->num_irqs = len / 4;
 823         } else {
 824                 op->num_irqs = 0;
 825         }
 826
 827         /* Prevent overruning the op->irqs[] array.  */
 828         if (op->num_irqs > PROMINTR_MAX) {
 829                 printk(KERN_WARNING "%s: Too many irqs (%d), "
 830                        "limiting to %d.\n",
 831                        dp->full_name, op->num_irqs, PROMINTR_MAX);
 832                 op->num_irqs = PROMINTR_MAX;
 833         }
 834
 835         build_device_resources(op, parent);
 836         for (i = 0; i < op->num_irqs; i++)
 837                 op->irqs[i] = build_one_device_irq(op, parent, op->irqs[i]);
 838
 839         op->dev.parent = parent;
 840         op->dev.bus = &of_bus_type;
 841         if (!parent)
 842                 strcpy(op->dev.bus_id, "root");
 843         else
 844                 strcpy(op->dev.bus_id, dp->path_component_name);
 845
 846         if (of_device_register(op)) {
 847                 printk("%s: Could not register of device.\n",
 848                        dp->full_name);
 849                 kfree(op);
 850                 op = NULL;
 851         }
 852
 853         return op;
 854 }
 855
 856 static void __init scan_tree(struct device_node *dp, struct device *parent)
 857 {
 858         while (dp) {
 859                 struct of_device *op = scan_one_device(dp, parent);
 860
 861                 if (op)
 862                         scan_tree(dp->child, &op->dev);
 863
 864                 dp = dp->sibling;
 865         }
 866 }
 867
 868 static void __init scan_of_devices(void)
 869 {
 870         struct device_node *root = of_find_node_by_path("/");
 871         struct of_device *parent;
 872
 873         parent = scan_one_device(root, NULL);
 874         if (!parent)
 875                 return;
 876
 877         scan_tree(root->child, &parent->dev);
 878 }
 879
 880 static int __init of_bus_driver_init(void)
 881 {
 882         int err;
 883
 884         err = bus_register(&of_bus_type);
 885 #ifdef CONFIG_PCI
 886         if (!err)
 887                 err = bus_register(&isa_bus_type);
 888         if (!err)
 889                 err = bus_register(&ebus_bus_type);
 890 #endif
 891 #ifdef CONFIG_SBUS
 892         if (!err)
 893                 err = bus_register(&sbus_bus_type);
 894 #endif
 895
 896         if (!err)
 897                 scan_of_devices();
 898
 899         return err;
 900 }
 901
 902 postcore_initcall(of_bus_driver_init);
 903
 904 static int __init of_debug(char *str)
 905 {
 906         int val = 0;
 907
 908         get_option(&str, &val);
 909         if (val & 1)
 910                 of_resource_verbose = 1;
 911         if (val & 2)
 912                 of_irq_verbose = 1;
 913         return 1;
 914 }
 915
 916 __setup("of_debug=", of_debug);
 917
 918 int of_register_driver(struct of_platform_driver *drv, struct bus_type *bus)
 919 {
 920         /* initialize common driver fields */
 921         drv->driver.name = drv->name;
 922         drv->driver.bus = bus;
 923
 924         /* register with core */
 925         return driver_register(&drv->driver);
 926 }
 927
 928 void of_unregister_driver(struct of_platform_driver *drv)
 929 {
 930         driver_unregister(&drv->driver);
 931 }
 932
 933
 934 static ssize_t dev_show_devspec(struct device *dev, struct device_attribute *attr, char *buf)
 935 {
 936         struct of_device *ofdev;
 937
 938         ofdev = to_of_device(dev);
 939         return sprintf(buf, "%s", ofdev->node->full_name);
 940 }
 941
 942 static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL);
 943
 944 /**
 945  * of_release_dev - free an of device structure when all users of it are finished.
 946  * @dev: device that's been disconnected
 947  *
 948  * Will be called only by the device core when all users of this of device are
 949  * done.
 950  */
 951 void of_release_dev(struct device *dev)
 952 {
 953         struct of_device *ofdev;
 954
 955         ofdev = to_of_device(dev);
 956
 957         kfree(ofdev);
 958 }
 959
 960 int of_device_register(struct of_device *ofdev)
 961 {
 962         int rc;
 963
 964         BUG_ON(ofdev->node == NULL);
 965
 966         rc = device_register(&ofdev->dev);
 967         if (rc)
 968                 return rc;
 969
 970         rc = device_create_file(&ofdev->dev, &dev_attr_devspec);
 971         if (rc)
 972                 device_unregister(&ofdev->dev);
 973
 974         return rc;
 975 }
 976
 977 void of_device_unregister(struct of_device *ofdev)
 978 {
 979         device_remove_file(&ofdev->dev, &dev_attr_devspec);
 980         device_unregister(&ofdev->dev);
 981 }
 982
 983 struct of_device* of_platform_device_create(struct device_node *np,
 984                                             const char *bus_id,
 985                                             struct device *parent,
 986                                             struct bus_type *bus)
 987 {
 988         struct of_device *dev;
 989
 990         dev = kmalloc(sizeof(*dev), GFP_KERNEL);
 991         if (!dev)
 992                 return NULL;
 993         memset(dev, 0, sizeof(*dev));
 994
 995         dev->dev.parent = parent;
 996         dev->dev.bus = bus;
 997         dev->dev.release = of_release_dev;
 998
 999         strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
1000
1001         if (of_device_register(dev) != 0) {
1002                 kfree(dev);
1003                 return NULL;
1004         }
1005
1006         return dev;
1007 }
1008
1009 EXPORT_SYMBOL(of_match_device);
1010 EXPORT_SYMBOL(of_register_driver);
1011 EXPORT_SYMBOL(of_unregister_driver);
1012 EXPORT_SYMBOL(of_device_register);
1013 EXPORT_SYMBOL(of_device_unregister);
1014 EXPORT_SYMBOL(of_dev_get);
1015 EXPORT_SYMBOL(of_dev_put);
1016 EXPORT_SYMBOL(of_platform_device_create);
1017 EXPORT_SYMBOL(of_release_dev);