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         struct resource *r;
 135
 136         if (res->flags & IORESOURCE_MEM)
 137                 r = request_mem_region(ret, size, name);
 138         else
 139                 r = request_region(ret, size, name);
 140         if (!r)
 141                 ret = 0;
 142
 143         return (void __iomem *) ret;
 144 }
 145 EXPORT_SYMBOL(of_ioremap);
 146
 147 void of_iounmap(void __iomem *base, unsigned long size)
 148 {
 149         release_region((unsigned long) base, size);
 150 }
 151 EXPORT_SYMBOL(of_iounmap);
 152
 153 static int node_match(struct device *dev, void *data)
 154 {
 155         struct of_device *op = to_of_device(dev);
 156         struct device_node *dp = data;
 157
 158         return (op->node == dp);
 159 }
 160
 161 struct of_device *of_find_device_by_node(struct device_node *dp)
 162 {
 163         struct device *dev = bus_find_device(&of_bus_type, NULL,
 164                                              dp, node_match);
 165
 166         if (dev)
 167                 return to_of_device(dev);
 168
 169         return NULL;
 170 }
 171 EXPORT_SYMBOL(of_find_device_by_node);
 172
 173 #ifdef CONFIG_PCI
 174 struct bus_type isa_bus_type = {
 175        .name    = "isa",
 176        .match   = of_platform_bus_match,
 177        .probe   = of_device_probe,
 178        .remove  = of_device_remove,
 179        .suspend = of_device_suspend,
 180        .resume  = of_device_resume,
 181 };
 182 EXPORT_SYMBOL(isa_bus_type);
 183
 184 struct bus_type ebus_bus_type = {
 185        .name    = "ebus",
 186        .match   = of_platform_bus_match,
 187        .probe   = of_device_probe,
 188        .remove  = of_device_remove,
 189        .suspend = of_device_suspend,
 190        .resume  = of_device_resume,
 191 };
 192 EXPORT_SYMBOL(ebus_bus_type);
 193 #endif
 194
 195 #ifdef CONFIG_SBUS
 196 struct bus_type sbus_bus_type = {
 197        .name    = "sbus",
 198        .match   = of_platform_bus_match,
 199        .probe   = of_device_probe,
 200        .remove  = of_device_remove,
 201        .suspend = of_device_suspend,
 202        .resume  = of_device_resume,
 203 };
 204 EXPORT_SYMBOL(sbus_bus_type);
 205 #endif
 206
 207 struct bus_type of_bus_type = {
 208        .name    = "of",
 209        .match   = of_platform_bus_match,
 210        .probe   = of_device_probe,
 211        .remove  = of_device_remove,
 212        .suspend = of_device_suspend,
 213        .resume  = of_device_resume,
 214 };
 215 EXPORT_SYMBOL(of_bus_type);
 216
 217 static inline u64 of_read_addr(const u32 *cell, int size)
 218 {
 219         u64 r = 0;
 220         while (size--)
 221                 r = (r << 32) | *(cell++);
 222         return r;
 223 }
 224
 225 static void __init get_cells(struct device_node *dp,
 226                              int *addrc, int *sizec)
 227 {
 228         if (addrc)
 229                 *addrc = of_n_addr_cells(dp);
 230         if (sizec)
 231                 *sizec = of_n_size_cells(dp);
 232 }
 233
 234 /* Max address size we deal with */
 235 #define OF_MAX_ADDR_CELLS       4
 236
 237 struct of_bus {
 238         const char      *name;
 239         const char      *addr_prop_name;
 240         int             (*match)(struct device_node *parent);
 241         void            (*count_cells)(struct device_node *child,
 242                                        int *addrc, int *sizec);
 243         int             (*map)(u32 *addr, const u32 *range,
 244                                int na, int ns, int pna);
 245         unsigned int    (*get_flags)(u32 *addr);
 246 };
 247
 248 /*
 249  * Default translator (generic bus)
 250  */
 251
 252 static void of_bus_default_count_cells(struct device_node *dev,
 253                                        int *addrc, int *sizec)
 254 {
 255         get_cells(dev, addrc, sizec);
 256 }
 257
 258 /* Make sure the least significant 64-bits are in-range.  Even
 259  * for 3 or 4 cell values it is a good enough approximation.
 260  */
 261 static int of_out_of_range(const u32 *addr, const u32 *base,
 262                            const u32 *size, int na, int ns)
 263 {
 264         u64 a = of_read_addr(addr, na);
 265         u64 b = of_read_addr(base, na);
 266
 267         if (a < b)
 268                 return 1;
 269
 270         b += of_read_addr(size, ns);
 271         if (a >= b)
 272                 return 1;
 273
 274         return 0;
 275 }
 276
 277 static int of_bus_default_map(u32 *addr, const u32 *range,
 278                               int na, int ns, int pna)
 279 {
 280         u32 result[OF_MAX_ADDR_CELLS];
 281         int i;
 282
 283         if (ns > 2) {
 284                 printk("of_device: Cannot handle size cells (%d) > 2.", ns);
 285                 return -EINVAL;
 286         }
 287
 288         if (of_out_of_range(addr, range, range + na + pna, na, ns))
 289                 return -EINVAL;
 290
 291         /* Start with the parent range base.  */
 292         memcpy(result, range + na, pna * 4);
 293
 294         /* Add in the child address offset.  */
 295         for (i = 0; i < na; i++)
 296                 result[pna - 1 - i] +=
 297                         (addr[na - 1 - i] -
 298                          range[na - 1 - i]);
 299
 300         memcpy(addr, result, pna * 4);
 301
 302         return 0;
 303 }
 304
 305 static unsigned int of_bus_default_get_flags(u32 *addr)
 306 {
 307         return IORESOURCE_MEM;
 308 }
 309
 310 /*
 311  * PCI bus specific translator
 312  */
 313
 314 static int of_bus_pci_match(struct device_node *np)
 315 {
 316         if (!strcmp(np->type, "pci") || !strcmp(np->type, "pciex")) {
 317                 /* Do not do PCI specific frobbing if the
 318                  * PCI bridge lacks a ranges property.  We
 319                  * want to pass it through up to the next
 320                  * parent as-is, not with the PCI translate
 321                  * method which chops off the top address cell.
 322                  */
 323                 if (!of_find_property(np, "ranges", NULL))
 324                         return 0;
 325
 326                 return 1;
 327         }
 328
 329         return 0;
 330 }
 331
 332 static void of_bus_pci_count_cells(struct device_node *np,
 333                                    int *addrc, int *sizec)
 334 {
 335         if (addrc)
 336                 *addrc = 3;
 337         if (sizec)
 338                 *sizec = 2;
 339 }
 340
 341 static int of_bus_pci_map(u32 *addr, const u32 *range,
 342                           int na, int ns, int pna)
 343 {
 344         u32 result[OF_MAX_ADDR_CELLS];
 345         int i;
 346
 347         /* Check address type match */
 348         if ((addr[0] ^ range[0]) & 0x03000000)
 349                 return -EINVAL;
 350
 351         if (of_out_of_range(addr + 1, range + 1, range + na + pna,
 352                             na - 1, ns))
 353                 return -EINVAL;
 354
 355         /* Start with the parent range base.  */
 356         memcpy(result, range + na, pna * 4);
 357
 358         /* Add in the child address offset, skipping high cell.  */
 359         for (i = 0; i < na - 1; i++)
 360                 result[pna - 1 - i] +=
 361                         (addr[na - 1 - i] -
 362                          range[na - 1 - i]);
 363
 364         memcpy(addr, result, pna * 4);
 365
 366         return 0;
 367 }
 368
 369 static unsigned int of_bus_pci_get_flags(u32 *addr)
 370 {
 371         unsigned int flags = 0;
 372         u32 w = addr[0];
 373
 374         switch((w >> 24) & 0x03) {
 375         case 0x01:
 376                 flags |= IORESOURCE_IO;
 377         case 0x02: /* 32 bits */
 378         case 0x03: /* 64 bits */
 379                 flags |= IORESOURCE_MEM;
 380         }
 381         if (w & 0x40000000)
 382                 flags |= IORESOURCE_PREFETCH;
 383         return flags;
 384 }
 385
 386 /*
 387  * SBUS bus specific translator
 388  */
 389
 390 static int of_bus_sbus_match(struct device_node *np)
 391 {
 392         return !strcmp(np->name, "sbus") ||
 393                 !strcmp(np->name, "sbi");
 394 }
 395
 396 static void of_bus_sbus_count_cells(struct device_node *child,
 397                                    int *addrc, int *sizec)
 398 {
 399         if (addrc)
 400                 *addrc = 2;
 401         if (sizec)
 402                 *sizec = 1;
 403 }
 404
 405 static int of_bus_sbus_map(u32 *addr, const u32 *range, int na, int ns, int pna)
 406 {
 407         return of_bus_default_map(addr, range, na, ns, pna);
 408 }
 409
 410 static unsigned int of_bus_sbus_get_flags(u32 *addr)
 411 {
 412         return IORESOURCE_MEM;
 413 }
 414
 415
 416 /*
 417  * Array of bus specific translators
 418  */
 419
 420 static struct of_bus of_busses[] = {
 421         /* PCI */
 422         {
 423                 .name = "pci",
 424                 .addr_prop_name = "assigned-addresses",
 425                 .match = of_bus_pci_match,
 426                 .count_cells = of_bus_pci_count_cells,
 427                 .map = of_bus_pci_map,
 428                 .get_flags = of_bus_pci_get_flags,
 429         },
 430         /* SBUS */
 431         {
 432                 .name = "sbus",
 433                 .addr_prop_name = "reg",
 434                 .match = of_bus_sbus_match,
 435                 .count_cells = of_bus_sbus_count_cells,
 436                 .map = of_bus_sbus_map,
 437                 .get_flags = of_bus_sbus_get_flags,
 438         },
 439         /* Default */
 440         {
 441                 .name = "default",
 442                 .addr_prop_name = "reg",
 443                 .match = NULL,
 444                 .count_cells = of_bus_default_count_cells,
 445                 .map = of_bus_default_map,
 446                 .get_flags = of_bus_default_get_flags,
 447         },
 448 };
 449
 450 static struct of_bus *of_match_bus(struct device_node *np)
 451 {
 452         int i;
 453
 454         for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
 455                 if (!of_busses[i].match || of_busses[i].match(np))
 456                         return &of_busses[i];
 457         BUG();
 458         return NULL;
 459 }
 460
 461 static int __init build_one_resource(struct device_node *parent,
 462                                      struct of_bus *bus,
 463                                      struct of_bus *pbus,
 464                                      u32 *addr,
 465                                      int na, int ns, int pna)
 466 {
 467         u32 *ranges;
 468         unsigned int rlen;
 469         int rone;
 470
 471         ranges = of_get_property(parent, "ranges", &rlen);
 472         if (ranges == NULL || rlen == 0) {
 473                 u32 result[OF_MAX_ADDR_CELLS];
 474                 int i;
 475
 476                 memset(result, 0, pna * 4);
 477                 for (i = 0; i < na; i++)
 478                         result[pna - 1 - i] =
 479                                 addr[na - 1 - i];
 480
 481                 memcpy(addr, result, pna * 4);
 482                 return 0;
 483         }
 484
 485         /* Now walk through the ranges */
 486         rlen /= 4;
 487         rone = na + pna + ns;
 488         for (; rlen >= rone; rlen -= rone, ranges += rone) {
 489                 if (!bus->map(addr, ranges, na, ns, pna))
 490                         return 0;
 491         }
 492
 493         return 1;
 494 }
 495
 496 static int __init use_1to1_mapping(struct device_node *pp)
 497 {
 498         char *model;
 499
 500         /* If this is on the PMU bus, don't try to translate it even
 501          * if a ranges property exists.
 502          */
 503         if (!strcmp(pp->name, "pmu"))
 504                 return 1;
 505
 506         /* If we have a ranges property in the parent, use it.  */
 507         if (of_find_property(pp, "ranges", NULL) != NULL)
 508                 return 0;
 509
 510         /* If the parent is the dma node of an ISA bus, pass
 511          * the translation up to the root.
 512          */
 513         if (!strcmp(pp->name, "dma"))
 514                 return 0;
 515
 516         /* Similarly for Simba PCI bridges.  */
 517         model = of_get_property(pp, "model", NULL);
 518         if (model && !strcmp(model, "SUNW,simba"))
 519                 return 0;
 520
 521         return 1;
 522 }
 523
 524 static int of_resource_verbose;
 525
 526 static void __init build_device_resources(struct of_device *op,
 527                                           struct device *parent)
 528 {
 529         struct of_device *p_op;
 530         struct of_bus *bus;
 531         int na, ns;
 532         int index, num_reg;
 533         void *preg;
 534
 535         if (!parent)
 536                 return;
 537
 538         p_op = to_of_device(parent);
 539         bus = of_match_bus(p_op->node);
 540         bus->count_cells(op->node, &na, &ns);
 541
 542         preg = of_get_property(op->node, bus->addr_prop_name, &num_reg);
 543         if (!preg || num_reg == 0)
 544                 return;
 545
 546         /* Convert to num-cells.  */
 547         num_reg /= 4;
 548
 549         /* Convert to num-entries.  */
 550         num_reg /= na + ns;
 551
 552         /* Prevent overruning the op->resources[] array.  */
 553         if (num_reg > PROMREG_MAX) {
 554                 printk(KERN_WARNING "%s: Too many regs (%d), "
 555                        "limiting to %d.\n",
 556                        op->node->full_name, num_reg, PROMREG_MAX);
 557                 num_reg = PROMREG_MAX;
 558         }
 559
 560         for (index = 0; index < num_reg; index++) {
 561                 struct resource *r = &op->resource[index];
 562                 u32 addr[OF_MAX_ADDR_CELLS];
 563                 u32 *reg = (preg + (index * ((na + ns) * 4)));
 564                 struct device_node *dp = op->node;
 565                 struct device_node *pp = p_op->node;
 566                 struct of_bus *pbus;
 567                 u64 size, result = OF_BAD_ADDR;
 568                 unsigned long flags;
 569                 int dna, dns;
 570                 int pna, pns;
 571
 572                 size = of_read_addr(reg + na, ns);
 573                 flags = bus->get_flags(reg);
 574
 575                 memcpy(addr, reg, na * 4);
 576
 577                 if (use_1to1_mapping(pp)) {
 578                         result = of_read_addr(addr, na);
 579                         goto build_res;
 580                 }
 581
 582                 dna = na;
 583                 dns = ns;
 584
 585                 while (1) {
 586                         dp = pp;
 587                         pp = dp->parent;
 588                         if (!pp) {
 589                                 result = of_read_addr(addr, dna);
 590                                 break;
 591                         }
 592
 593                         pbus = of_match_bus(pp);
 594                         pbus->count_cells(dp, &pna, &pns);
 595
 596                         if (build_one_resource(dp, bus, pbus, addr,
 597                                                dna, dns, pna))
 598                                 break;
 599
 600                         dna = pna;
 601                         dns = pns;
 602                         bus = pbus;
 603                 }
 604
 605         build_res:
 606                 memset(r, 0, sizeof(*r));
 607
 608                 if (of_resource_verbose)
 609                         printk("%s reg[%d] -> %lx\n",
 610                                op->node->full_name, index,
 611                                result);
 612
 613                 if (result != OF_BAD_ADDR) {
 614                         if (tlb_type == hypervisor)
 615                                 result &= 0x0fffffffffffffffUL;
 616
 617                         r->start = result;
 618                         r->end = result + size - 1;
 619                         r->flags = flags;
 620                 } else {
 621                         r->start = ~0UL;
 622                         r->end = ~0UL;
 623                 }
 624                 r->name = op->node->name;
 625         }
 626 }
 627
 628 static struct device_node * __init
 629 apply_interrupt_map(struct device_node *dp, struct device_node *pp,
 630                     u32 *imap, int imlen, u32 *imask,
 631                     unsigned int *irq_p)
 632 {
 633         struct device_node *cp;
 634         unsigned int irq = *irq_p;
 635         struct of_bus *bus;
 636         phandle handle;
 637         u32 *reg;
 638         int na, num_reg, i;
 639
 640         bus = of_match_bus(pp);
 641         bus->count_cells(dp, &na, NULL);
 642
 643         reg = of_get_property(dp, "reg", &num_reg);
 644         if (!reg || !num_reg)
 645                 return NULL;
 646
 647         imlen /= ((na + 3) * 4);
 648         handle = 0;
 649         for (i = 0; i < imlen; i++) {
 650                 int j;
 651
 652                 for (j = 0; j < na; j++) {
 653                         if ((reg[j] & imask[j]) != imap[j])
 654                                 goto next;
 655                 }
 656                 if (imap[na] == irq) {
 657                         handle = imap[na + 1];
 658                         irq = imap[na + 2];
 659                         break;
 660                 }
 661
 662         next:
 663                 imap += (na + 3);
 664         }
 665         if (i == imlen) {
 666                 /* Psycho and Sabre PCI controllers can have 'interrupt-map'
 667                  * properties that do not include the on-board device
 668                  * interrupts.  Instead, the device's 'interrupts' property
 669                  * is already a fully specified INO value.
 670                  *
 671                  * Handle this by deciding that, if we didn't get a
 672                  * match in the parent's 'interrupt-map', and the
 673                  * parent is an IRQ translater, then use the parent as
 674                  * our IRQ controller.
 675                  */
 676                 if (pp->irq_trans)
 677                         return pp;
 678
 679                 return NULL;
 680         }
 681
 682         *irq_p = irq;
 683         cp = of_find_node_by_phandle(handle);
 684
 685         return cp;
 686 }
 687
 688 static unsigned int __init pci_irq_swizzle(struct device_node *dp,
 689                                            struct device_node *pp,
 690                                            unsigned int irq)
 691 {
 692         struct linux_prom_pci_registers *regs;
 693         unsigned int devfn, slot, ret;
 694
 695         if (irq < 1 || irq > 4)
 696                 return irq;
 697
 698         regs = of_get_property(dp, "reg", NULL);
 699         if (!regs)
 700                 return irq;
 701
 702         devfn = (regs->phys_hi >> 8) & 0xff;
 703         slot = (devfn >> 3) & 0x1f;
 704
 705         ret = ((irq - 1 + (slot & 3)) & 3) + 1;
 706
 707         return ret;
 708 }
 709
 710 static int of_irq_verbose;
 711
 712 static unsigned int __init build_one_device_irq(struct of_device *op,
 713                                                 struct device *parent,
 714                                                 unsigned int irq)
 715 {
 716         struct device_node *dp = op->node;
 717         struct device_node *pp, *ip;
 718         unsigned int orig_irq = irq;
 719
 720         if (irq == 0xffffffff)
 721                 return irq;
 722
 723         if (dp->irq_trans) {
 724                 irq = dp->irq_trans->irq_build(dp, irq,
 725                                                dp->irq_trans->data);
 726
 727                 if (of_irq_verbose)
 728                         printk("%s: direct translate %x --> %x\n",
 729                                dp->full_name, orig_irq, irq);
 730
 731                 return irq;
 732         }
 733
 734         /* Something more complicated.  Walk up to the root, applying
 735          * interrupt-map or bus specific translations, until we hit
 736          * an IRQ translator.
 737          *
 738          * If we hit a bus type or situation we cannot handle, we
 739          * stop and assume that the original IRQ number was in a
 740          * format which has special meaning to it's immediate parent.
 741          */
 742         pp = dp->parent;
 743         ip = NULL;
 744         while (pp) {
 745                 void *imap, *imsk;
 746                 int imlen;
 747
 748                 imap = of_get_property(pp, "interrupt-map", &imlen);
 749                 imsk = of_get_property(pp, "interrupt-map-mask", NULL);
 750                 if (imap && imsk) {
 751                         struct device_node *iret;
 752                         int this_orig_irq = irq;
 753
 754                         iret = apply_interrupt_map(dp, pp,
 755                                                    imap, imlen, imsk,
 756                                                    &irq);
 757
 758                         if (of_irq_verbose)
 759                                 printk("%s: Apply [%s:%x] imap --> [%s:%x]\n",
 760                                        op->node->full_name,
 761                                        pp->full_name, this_orig_irq,
 762                                        (iret ? iret->full_name : "NULL"), irq);
 763
 764                         if (!iret)
 765                                 break;
 766
 767                         if (iret->irq_trans) {
 768                                 ip = iret;
 769                                 break;
 770                         }
 771                 } else {
 772                         if (!strcmp(pp->type, "pci") ||
 773                             !strcmp(pp->type, "pciex")) {
 774                                 unsigned int this_orig_irq = irq;
 775
 776                                 irq = pci_irq_swizzle(dp, pp, irq);
 777                                 if (of_irq_verbose)
 778                                         printk("%s: PCI swizzle [%s] "
 779                                                "%x --> %x\n",
 780                                                op->node->full_name,
 781                                                pp->full_name, this_orig_irq,
 782                                                irq);
 783
 784                         }
 785
 786                         if (pp->irq_trans) {
 787                                 ip = pp;
 788                                 break;
 789                         }
 790                 }
 791                 dp = pp;
 792                 pp = pp->parent;
 793         }
 794         if (!ip)
 795                 return orig_irq;
 796
 797         irq = ip->irq_trans->irq_build(op->node, irq,
 798                                        ip->irq_trans->data);
 799         if (of_irq_verbose)
 800                 printk("%s: Apply IRQ trans [%s] %x --> %x\n",
 801                        op->node->full_name, ip->full_name, orig_irq, irq);
 802
 803         return irq;
 804 }
 805
 806 static struct of_device * __init scan_one_device(struct device_node *dp,
 807                                                  struct device *parent)
 808 {
 809         struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
 810         unsigned int *irq;
 811         int len, i;
 812
 813         if (!op)
 814                 return NULL;
 815
 816         op->node = dp;
 817
 818         op->clock_freq = of_getintprop_default(dp, "clock-frequency",
 819                                                (25*1000*1000));
 820         op->portid = of_getintprop_default(dp, "upa-portid", -1);
 821         if (op->portid == -1)
 822                 op->portid = of_getintprop_default(dp, "portid", -1);
 823
 824         irq = of_get_property(dp, "interrupts", &len);
 825         if (irq) {
 826                 memcpy(op->irqs, irq, len);
 827                 op->num_irqs = len / 4;
 828         } else {
 829                 op->num_irqs = 0;
 830         }
 831
 832         /* Prevent overruning the op->irqs[] array.  */
 833         if (op->num_irqs > PROMINTR_MAX) {
 834                 printk(KERN_WARNING "%s: Too many irqs (%d), "
 835                        "limiting to %d.\n",
 836                        dp->full_name, op->num_irqs, PROMINTR_MAX);
 837                 op->num_irqs = PROMINTR_MAX;
 838         }
 839
 840         build_device_resources(op, parent);
 841         for (i = 0; i < op->num_irqs; i++)
 842                 op->irqs[i] = build_one_device_irq(op, parent, op->irqs[i]);
 843
 844         op->dev.parent = parent;
 845         op->dev.bus = &of_bus_type;
 846         if (!parent)
 847                 strcpy(op->dev.bus_id, "root");
 848         else
 849                 sprintf(op->dev.bus_id, "%s@%08x", dp->name, dp->node);
 850
 851         if (of_device_register(op)) {
 852                 printk("%s: Could not register of device.\n",
 853                        dp->full_name);
 854                 kfree(op);
 855                 op = NULL;
 856         }
 857
 858         return op;
 859 }
 860
 861 static void __init scan_tree(struct device_node *dp, struct device *parent)
 862 {
 863         while (dp) {
 864                 struct of_device *op = scan_one_device(dp, parent);
 865
 866                 if (op)
 867                         scan_tree(dp->child, &op->dev);
 868
 869                 dp = dp->sibling;
 870         }
 871 }
 872
 873 static void __init scan_of_devices(void)
 874 {
 875         struct device_node *root = of_find_node_by_path("/");
 876         struct of_device *parent;
 877
 878         parent = scan_one_device(root, NULL);
 879         if (!parent)
 880                 return;
 881
 882         scan_tree(root->child, &parent->dev);
 883 }
 884
 885 static int __init of_bus_driver_init(void)
 886 {
 887         int err;
 888
 889         err = bus_register(&of_bus_type);
 890 #ifdef CONFIG_PCI
 891         if (!err)
 892                 err = bus_register(&isa_bus_type);
 893         if (!err)
 894                 err = bus_register(&ebus_bus_type);
 895 #endif
 896 #ifdef CONFIG_SBUS
 897         if (!err)
 898                 err = bus_register(&sbus_bus_type);
 899 #endif
 900
 901         if (!err)
 902                 scan_of_devices();
 903
 904         return err;
 905 }
 906
 907 postcore_initcall(of_bus_driver_init);
 908
 909 static int __init of_debug(char *str)
 910 {
 911         int val = 0;
 912
 913         get_option(&str, &val);
 914         if (val & 1)
 915                 of_resource_verbose = 1;
 916         if (val & 2)
 917                 of_irq_verbose = 1;
 918         return 1;
 919 }
 920
 921 __setup("of_debug=", of_debug);
 922
 923 int of_register_driver(struct of_platform_driver *drv, struct bus_type *bus)
 924 {
 925         /* initialize common driver fields */
 926         drv->driver.name = drv->name;
 927         drv->driver.bus = bus;
 928
 929         /* register with core */
 930         return driver_register(&drv->driver);
 931 }
 932
 933 void of_unregister_driver(struct of_platform_driver *drv)
 934 {
 935         driver_unregister(&drv->driver);
 936 }
 937
 938
 939 static ssize_t dev_show_devspec(struct device *dev, struct device_attribute *attr, char *buf)
 940 {
 941         struct of_device *ofdev;
 942
 943         ofdev = to_of_device(dev);
 944         return sprintf(buf, "%s", ofdev->node->full_name);
 945 }
 946
 947 static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL);
 948
 949 /**
 950  * of_release_dev - free an of device structure when all users of it are finished.
 951  * @dev: device that's been disconnected
 952  *
 953  * Will be called only by the device core when all users of this of device are
 954  * done.
 955  */
 956 void of_release_dev(struct device *dev)
 957 {
 958         struct of_device *ofdev;
 959
 960         ofdev = to_of_device(dev);
 961
 962         kfree(ofdev);
 963 }
 964
 965 int of_device_register(struct of_device *ofdev)
 966 {
 967         int rc;
 968
 969         BUG_ON(ofdev->node == NULL);
 970
 971         rc = device_register(&ofdev->dev);
 972         if (rc)
 973                 return rc;
 974
 975         rc = device_create_file(&ofdev->dev, &dev_attr_devspec);
 976         if (rc)
 977                 device_unregister(&ofdev->dev);
 978
 979         return rc;
 980 }
 981
 982 void of_device_unregister(struct of_device *ofdev)
 983 {
 984         device_remove_file(&ofdev->dev, &dev_attr_devspec);
 985         device_unregister(&ofdev->dev);
 986 }
 987
 988 struct of_device* of_platform_device_create(struct device_node *np,
 989                                             const char *bus_id,
 990                                             struct device *parent,
 991                                             struct bus_type *bus)
 992 {
 993         struct of_device *dev;
 994
 995         dev = kmalloc(sizeof(*dev), GFP_KERNEL);
 996         if (!dev)
 997                 return NULL;
 998         memset(dev, 0, sizeof(*dev));
 999
1000         dev->dev.parent = parent;
1001         dev->dev.bus = bus;
1002         dev->dev.release = of_release_dev;
1003
1004         strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
1005
1006         if (of_device_register(dev) != 0) {
1007                 kfree(dev);
1008                 return NULL;
1009         }
1010
1011         return dev;
1012 }
1013
1014 EXPORT_SYMBOL(of_match_device);
1015 EXPORT_SYMBOL(of_register_driver);
1016 EXPORT_SYMBOL(of_unregister_driver);
1017 EXPORT_SYMBOL(of_device_register);
1018 EXPORT_SYMBOL(of_device_unregister);
1019 EXPORT_SYMBOL(of_dev_get);
1020 EXPORT_SYMBOL(of_dev_put);
1021 EXPORT_SYMBOL(of_platform_device_create);
1022 EXPORT_SYMBOL(of_release_dev);