arch/sparc64/kernel/of_device.c

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