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(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         u64             (*map)(u32 *addr, u32 *range, int na, int ns, int pna);
 240         int             (*translate)(u32 *addr, u64 offset, int na);
 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 static u64 of_bus_default_map(u32 *addr, u32 *range, int na, int ns, int pna)
 255 {
 256         u64 cp, s, da;
 257
 258         cp = of_read_addr(range, na);
 259         s  = of_read_addr(range + na + pna, ns);
 260         da = of_read_addr(addr, na);
 261
 262         if (da < cp || da >= (cp + s))
 263                 return OF_BAD_ADDR;
 264         return da - cp;
 265 }
 266
 267 static int of_bus_default_translate(u32 *addr, u64 offset, int na)
 268 {
 269         u64 a = of_read_addr(addr, na);
 270         memset(addr, 0, na * 4);
 271         a += offset;
 272         if (na > 1)
 273                 addr[na - 2] = a >> 32;
 274         addr[na - 1] = a & 0xffffffffu;
 275
 276         return 0;
 277 }
 278
 279 static unsigned int of_bus_default_get_flags(u32 *addr)
 280 {
 281         return IORESOURCE_MEM;
 282 }
 283
 284 /*
 285  * PCI bus specific translator
 286  */
 287
 288 static int of_bus_pci_match(struct device_node *np)
 289 {
 290         return !strcmp(np->type, "pci") || !strcmp(np->type, "pciex");
 291 }
 292
 293 static void of_bus_pci_count_cells(struct device_node *np,
 294                                    int *addrc, int *sizec)
 295 {
 296         if (addrc)
 297                 *addrc = 3;
 298         if (sizec)
 299                 *sizec = 2;
 300 }
 301
 302 static u64 of_bus_pci_map(u32 *addr, u32 *range, int na, int ns, int pna)
 303 {
 304         u64 cp, s, da;
 305
 306         /* Check address type match */
 307         if ((addr[0] ^ range[0]) & 0x03000000)
 308                 return OF_BAD_ADDR;
 309
 310         /* Read address values, skipping high cell */
 311         cp = of_read_addr(range + 1, na - 1);
 312         s  = of_read_addr(range + na + pna, ns);
 313         da = of_read_addr(addr + 1, na - 1);
 314
 315         if (da < cp || da >= (cp + s))
 316                 return OF_BAD_ADDR;
 317         return da - cp;
 318 }
 319
 320 static int of_bus_pci_translate(u32 *addr, u64 offset, int na)
 321 {
 322         return of_bus_default_translate(addr + 1, offset, na - 1);
 323 }
 324
 325 static unsigned int of_bus_pci_get_flags(u32 *addr)
 326 {
 327         unsigned int flags = 0;
 328         u32 w = addr[0];
 329
 330         switch((w >> 24) & 0x03) {
 331         case 0x01:
 332                 flags |= IORESOURCE_IO;
 333         case 0x02: /* 32 bits */
 334         case 0x03: /* 64 bits */
 335                 flags |= IORESOURCE_MEM;
 336         }
 337         if (w & 0x40000000)
 338                 flags |= IORESOURCE_PREFETCH;
 339         return flags;
 340 }
 341
 342 /*
 343  * ISA bus specific translator
 344  */
 345
 346 static int of_bus_isa_match(struct device_node *np)
 347 {
 348         return !strcmp(np->name, "isa");
 349 }
 350
 351 static void of_bus_isa_count_cells(struct device_node *child,
 352                                    int *addrc, int *sizec)
 353 {
 354         if (addrc)
 355                 *addrc = 2;
 356         if (sizec)
 357                 *sizec = 1;
 358 }
 359
 360 static u64 of_bus_isa_map(u32 *addr, u32 *range, int na, int ns, int pna)
 361 {
 362         u64 cp, s, da;
 363
 364         /* Check address type match */
 365         if ((addr[0] ^ range[0]) & 0x00000001)
 366                 return OF_BAD_ADDR;
 367
 368         /* Read address values, skipping high cell */
 369         cp = of_read_addr(range + 1, na - 1);
 370         s  = of_read_addr(range + na + pna, ns);
 371         da = of_read_addr(addr + 1, na - 1);
 372
 373         if (da < cp || da >= (cp + s))
 374                 return OF_BAD_ADDR;
 375         return da - cp;
 376 }
 377
 378 static int of_bus_isa_translate(u32 *addr, u64 offset, int na)
 379 {
 380         return of_bus_default_translate(addr + 1, offset, na - 1);
 381 }
 382
 383 static unsigned int of_bus_isa_get_flags(u32 *addr)
 384 {
 385         unsigned int flags = 0;
 386         u32 w = addr[0];
 387
 388         if (w & 1)
 389                 flags |= IORESOURCE_IO;
 390         else
 391                 flags |= IORESOURCE_MEM;
 392         return flags;
 393 }
 394
 395 /*
 396  * SBUS bus specific translator
 397  */
 398
 399 static int of_bus_sbus_match(struct device_node *np)
 400 {
 401         return !strcmp(np->name, "sbus") ||
 402                 !strcmp(np->name, "sbi");
 403 }
 404
 405 static void of_bus_sbus_count_cells(struct device_node *child,
 406                                    int *addrc, int *sizec)
 407 {
 408         if (addrc)
 409                 *addrc = 2;
 410         if (sizec)
 411                 *sizec = 1;
 412 }
 413
 414 static u64 of_bus_sbus_map(u32 *addr, u32 *range, int na, int ns, int pna)
 415 {
 416         return of_bus_default_map(addr, range, na, ns, pna);
 417 }
 418
 419 static int of_bus_sbus_translate(u32 *addr, u64 offset, int na)
 420 {
 421         return of_bus_default_translate(addr, offset, na);
 422 }
 423
 424 static unsigned int of_bus_sbus_get_flags(u32 *addr)
 425 {
 426         return IORESOURCE_MEM;
 427 }
 428
 429
 430 /*
 431  * Array of bus specific translators
 432  */
 433
 434 static struct of_bus of_busses[] = {
 435         /* PCI */
 436         {
 437                 .name = "pci",
 438                 .addr_prop_name = "assigned-addresses",
 439                 .match = of_bus_pci_match,
 440                 .count_cells = of_bus_pci_count_cells,
 441                 .map = of_bus_pci_map,
 442                 .translate = of_bus_pci_translate,
 443                 .get_flags = of_bus_pci_get_flags,
 444         },
 445         /* ISA */
 446         {
 447                 .name = "isa",
 448                 .addr_prop_name = "reg",
 449                 .match = of_bus_isa_match,
 450                 .count_cells = of_bus_isa_count_cells,
 451                 .map = of_bus_isa_map,
 452                 .translate = of_bus_isa_translate,
 453                 .get_flags = of_bus_isa_get_flags,
 454         },
 455         /* SBUS */
 456         {
 457                 .name = "sbus",
 458                 .addr_prop_name = "reg",
 459                 .match = of_bus_sbus_match,
 460                 .count_cells = of_bus_sbus_count_cells,
 461                 .map = of_bus_sbus_map,
 462                 .translate = of_bus_sbus_translate,
 463                 .get_flags = of_bus_sbus_get_flags,
 464         },
 465         /* Default */
 466         {
 467                 .name = "default",
 468                 .addr_prop_name = "reg",
 469                 .match = NULL,
 470                 .count_cells = of_bus_default_count_cells,
 471                 .map = of_bus_default_map,
 472                 .translate = of_bus_default_translate,
 473                 .get_flags = of_bus_default_get_flags,
 474         },
 475 };
 476
 477 static struct of_bus *of_match_bus(struct device_node *np)
 478 {
 479         int i;
 480
 481         for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
 482                 if (!of_busses[i].match || of_busses[i].match(np))
 483                         return &of_busses[i];
 484         BUG();
 485         return NULL;
 486 }
 487
 488 static int __init build_one_resource(struct device_node *parent,
 489                                      struct of_bus *bus,
 490                                      struct of_bus *pbus,
 491                                      u32 *addr,
 492                                      int na, int ns, int pna)
 493 {
 494         u32 *ranges;
 495         unsigned int rlen;
 496         int rone;
 497         u64 offset = OF_BAD_ADDR;
 498
 499         ranges = of_get_property(parent, "ranges", &rlen);
 500         if (ranges == NULL || rlen == 0) {
 501                 offset = of_read_addr(addr, na);
 502                 memset(addr, 0, pna * 4);
 503                 goto finish;
 504         }
 505
 506         /* Now walk through the ranges */
 507         rlen /= 4;
 508         rone = na + pna + ns;
 509         for (; rlen >= rone; rlen -= rone, ranges += rone) {
 510                 offset = bus->map(addr, ranges, na, ns, pna);
 511                 if (offset != OF_BAD_ADDR)
 512                         break;
 513         }
 514         if (offset == OF_BAD_ADDR)
 515                 return 1;
 516
 517         memcpy(addr, ranges + na, 4 * pna);
 518
 519 finish:
 520         /* Translate it into parent bus space */
 521         return pbus->translate(addr, offset, pna);
 522 }
 523
 524 static void __init build_device_resources(struct of_device *op,
 525                                           struct device *parent)
 526 {
 527         struct of_device *p_op;
 528         struct of_bus *bus;
 529         int na, ns;
 530         int index, num_reg;
 531         void *preg;
 532
 533         if (!parent)
 534                 return;
 535
 536         p_op = to_of_device(parent);
 537         bus = of_match_bus(p_op->node);
 538         bus->count_cells(op->node, &na, &ns);
 539
 540         preg = of_get_property(op->node, bus->addr_prop_name, &num_reg);
 541         if (!preg || num_reg == 0)
 542                 return;
 543
 544         /* Convert to num-cells.  */
 545         num_reg /= 4;
 546
 547         /* Conver to num-entries.  */
 548         num_reg /= na + ns;
 549
 550         for (index = 0; index < num_reg; index++) {
 551                 struct resource *r = &op->resource[index];
 552                 u32 addr[OF_MAX_ADDR_CELLS];
 553                 u32 *reg = (preg + (index * ((na + ns) * 4)));
 554                 struct device_node *dp = op->node;
 555                 struct device_node *pp = p_op->node;
 556                 struct of_bus *pbus;
 557                 u64 size, result = OF_BAD_ADDR;
 558                 unsigned long flags;
 559                 int dna, dns;
 560                 int pna, pns;
 561
 562                 size = of_read_addr(reg + na, ns);
 563                 flags = bus->get_flags(reg);
 564
 565                 memcpy(addr, reg, na * 4);
 566
 567                 /* If the immediate parent has no ranges property to apply,
 568                  * just use a 1<->1 mapping.  Unless it is the 'dma' child
 569                  * of an isa bus, which must be passed up towards the root.
 570                  *
 571                  * Also, don't try to translate PMU bus device registers.
 572                  */
 573                 if ((of_find_property(pp, "ranges", NULL) == NULL &&
 574                      strcmp(pp->name, "dma") != 0) ||
 575                     !strcmp(pp->name, "pmu")) {
 576                         result = of_read_addr(addr, na);
 577                         goto build_res;
 578                 }
 579
 580                 dna = na;
 581                 dns = ns;
 582
 583                 while (1) {
 584                         dp = pp;
 585                         pp = dp->parent;
 586                         if (!pp) {
 587                                 result = of_read_addr(addr, dna);
 588                                 break;
 589                         }
 590
 591                         pbus = of_match_bus(pp);
 592                         pbus->count_cells(dp, &pna, &pns);
 593
 594                         if (build_one_resource(dp, bus, pbus, addr, dna, dns, pna))
 595                                 break;
 596
 597                         dna = pna;
 598                         dns = pns;
 599                         bus = pbus;
 600                 }
 601
 602         build_res:
 603                 memset(r, 0, sizeof(*r));
 604                 if (result != OF_BAD_ADDR) {
 605                         if (tlb_type == hypervisor)
 606                                 result &= 0x0fffffffffffffffUL;
 607
 608                         r->start = result;
 609                         r->end = result + size - 1;
 610                         r->flags = flags;
 611                 } else {
 612                         r->start = ~0UL;
 613                         r->end = ~0UL;
 614                 }
 615                 r->name = op->node->name;
 616         }
 617 }
 618
 619 static struct device_node * __init
 620 apply_interrupt_map(struct device_node *dp, struct device_node *pp,
 621                     u32 *imap, int imlen, u32 *imask,
 622                     unsigned int *irq_p)
 623 {
 624         struct device_node *cp;
 625         unsigned int irq = *irq_p;
 626         struct of_bus *bus;
 627         phandle handle;
 628         u32 *reg;
 629         int na, num_reg, i;
 630
 631         bus = of_match_bus(pp);
 632         bus->count_cells(dp, &na, NULL);
 633
 634         reg = of_get_property(dp, "reg", &num_reg);
 635         if (!reg || !num_reg)
 636                 return NULL;
 637
 638         imlen /= ((na + 3) * 4);
 639         handle = 0;
 640         for (i = 0; i < imlen; i++) {
 641                 int j;
 642
 643                 for (j = 0; j < na; j++) {
 644                         if ((reg[j] & imask[j]) != imap[j])
 645                                 goto next;
 646                 }
 647                 if (imap[na] == irq) {
 648                         handle = imap[na + 1];
 649                         irq = imap[na + 2];
 650                         break;
 651                 }
 652
 653         next:
 654                 imap += (na + 3);
 655         }
 656         if (i == imlen)
 657                 return NULL;
 658
 659         *irq_p = irq;
 660         cp = of_find_node_by_phandle(handle);
 661
 662         return cp;
 663 }
 664
 665 static unsigned int __init pci_irq_swizzle(struct device_node *dp,
 666                                            struct device_node *pp,
 667                                            unsigned int irq)
 668 {
 669         struct linux_prom_pci_registers *regs;
 670         unsigned int devfn, slot, ret;
 671
 672         if (irq < 1 || irq > 4)
 673                 return irq;
 674
 675         regs = of_get_property(dp, "reg", NULL);
 676         if (!regs)
 677                 return irq;
 678
 679         devfn = (regs->phys_hi >> 8) & 0xff;
 680         slot = (devfn >> 3) & 0x1f;
 681
 682         ret = ((irq - 1 + (slot & 3)) & 3) + 1;
 683
 684         return ret;
 685 }
 686
 687 static unsigned int __init build_one_device_irq(struct of_device *op,
 688                                                 struct device *parent,
 689                                                 unsigned int irq)
 690 {
 691         struct device_node *dp = op->node;
 692         struct device_node *pp, *ip;
 693         unsigned int orig_irq = irq;
 694
 695         if (irq == 0xffffffff)
 696                 return irq;
 697
 698         if (dp->irq_trans) {
 699                 irq = dp->irq_trans->irq_build(dp, irq,
 700                                                dp->irq_trans->data);
 701 #if 1
 702                 printk("%s: direct translate %x --> %x\n",
 703                        dp->full_name, orig_irq, irq);
 704 #endif
 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 #if 1
 732                         printk("%s: Apply [%s:%x] imap --> [%s:%x]\n",
 733                                op->node->full_name,
 734                                pp->full_name, this_orig_irq,
 735                                (iret ? iret->full_name : "NULL"), irq);
 736 #endif
 737                         if (!iret)
 738                                 break;
 739
 740                         if (iret->irq_trans) {
 741                                 ip = iret;
 742                                 break;
 743                         }
 744                 } else {
 745                         if (!strcmp(pp->type, "pci") ||
 746                             !strcmp(pp->type, "pciex")) {
 747                                 unsigned int this_orig_irq = irq;
 748
 749                                 irq = pci_irq_swizzle(dp, pp, irq);
 750 #if 1
 751                                 printk("%s: PCI swizzle [%s] %x --> %x\n",
 752                                        op->node->full_name,
 753                                        pp->full_name, this_orig_irq, irq);
 754 #endif
 755                         }
 756
 757                         if (pp->irq_trans) {
 758                                 ip = pp;
 759                                 break;
 760                         }
 761                 }
 762                 dp = pp;
 763                 pp = pp->parent;
 764         }
 765         if (!ip)
 766                 return orig_irq;
 767
 768         irq = ip->irq_trans->irq_build(op->node, irq,
 769                                        ip->irq_trans->data);
 770 #if 1
 771         printk("%s: Apply IRQ trans [%s] %x --> %x\n",
 772                op->node->full_name, ip->full_name, orig_irq, irq);
 773 #endif
 774
 775         return irq;
 776 }
 777
 778 static struct of_device * __init scan_one_device(struct device_node *dp,
 779                                                  struct device *parent)
 780 {
 781         struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
 782         unsigned int *irq;
 783         int len, i;
 784
 785         if (!op)
 786                 return NULL;
 787
 788         op->node = dp;
 789
 790         op->clock_freq = of_getintprop_default(dp, "clock-frequency",
 791                                                (25*1000*1000));
 792         op->portid = of_getintprop_default(dp, "upa-portid", -1);
 793         if (op->portid == -1)
 794                 op->portid = of_getintprop_default(dp, "portid", -1);
 795
 796         irq = of_get_property(dp, "interrupts", &len);
 797         if (irq) {
 798                 memcpy(op->irqs, irq, len);
 799                 op->num_irqs = len / 4;
 800         } else {
 801                 op->num_irqs = 0;
 802         }
 803
 804         build_device_resources(op, parent);
 805         for (i = 0; i < op->num_irqs; i++)
 806                 op->irqs[i] = build_one_device_irq(op, parent, op->irqs[i]);
 807
 808         op->dev.parent = parent;
 809         op->dev.bus = &of_bus_type;
 810         if (!parent)
 811                 strcpy(op->dev.bus_id, "root");
 812         else
 813                 strcpy(op->dev.bus_id, dp->path_component_name);
 814
 815         if (of_device_register(op)) {
 816                 printk("%s: Could not register of device.\n",
 817                        dp->full_name);
 818                 kfree(op);
 819                 op = NULL;
 820         }
 821
 822         return op;
 823 }
 824
 825 static void __init scan_tree(struct device_node *dp, struct device *parent)
 826 {
 827         while (dp) {
 828                 struct of_device *op = scan_one_device(dp, parent);
 829
 830                 if (op)
 831                         scan_tree(dp->child, &op->dev);
 832
 833                 dp = dp->sibling;
 834         }
 835 }
 836
 837 static void __init scan_of_devices(void)
 838 {
 839         struct device_node *root = of_find_node_by_path("/");
 840         struct of_device *parent;
 841
 842         parent = scan_one_device(root, NULL);
 843         if (!parent)
 844                 return;
 845
 846         scan_tree(root->child, &parent->dev);
 847 }
 848
 849 static int __init of_bus_driver_init(void)
 850 {
 851         int err;
 852
 853         err = bus_register(&of_bus_type);
 854 #ifdef CONFIG_PCI
 855         if (!err)
 856                 err = bus_register(&isa_bus_type);
 857         if (!err)
 858                 err = bus_register(&ebus_bus_type);
 859 #endif
 860 #ifdef CONFIG_SBUS
 861         if (!err)
 862                 err = bus_register(&sbus_bus_type);
 863 #endif
 864
 865         if (!err)
 866                 scan_of_devices();
 867
 868         return err;
 869 }
 870
 871 postcore_initcall(of_bus_driver_init);
 872
 873 int of_register_driver(struct of_platform_driver *drv, struct bus_type *bus)
 874 {
 875         /* initialize common driver fields */
 876         drv->driver.name = drv->name;
 877         drv->driver.bus = bus;
 878
 879         /* register with core */
 880         return driver_register(&drv->driver);
 881 }
 882
 883 void of_unregister_driver(struct of_platform_driver *drv)
 884 {
 885         driver_unregister(&drv->driver);
 886 }
 887
 888
 889 static ssize_t dev_show_devspec(struct device *dev, struct device_attribute *attr, char *buf)
 890 {
 891         struct of_device *ofdev;
 892
 893         ofdev = to_of_device(dev);
 894         return sprintf(buf, "%s", ofdev->node->full_name);
 895 }
 896
 897 static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL);
 898
 899 /**
 900  * of_release_dev - free an of device structure when all users of it are finished.
 901  * @dev: device that's been disconnected
 902  *
 903  * Will be called only by the device core when all users of this of device are
 904  * done.
 905  */
 906 void of_release_dev(struct device *dev)
 907 {
 908         struct of_device *ofdev;
 909
 910         ofdev = to_of_device(dev);
 911
 912         kfree(ofdev);
 913 }
 914
 915 int of_device_register(struct of_device *ofdev)
 916 {
 917         int rc;
 918
 919         BUG_ON(ofdev->node == NULL);
 920
 921         rc = device_register(&ofdev->dev);
 922         if (rc)
 923                 return rc;
 924
 925         device_create_file(&ofdev->dev, &dev_attr_devspec);
 926
 927         return 0;
 928 }
 929
 930 void of_device_unregister(struct of_device *ofdev)
 931 {
 932         device_remove_file(&ofdev->dev, &dev_attr_devspec);
 933         device_unregister(&ofdev->dev);
 934 }
 935
 936 struct of_device* of_platform_device_create(struct device_node *np,
 937                                             const char *bus_id,
 938                                             struct device *parent,
 939                                             struct bus_type *bus)
 940 {
 941         struct of_device *dev;
 942
 943         dev = kmalloc(sizeof(*dev), GFP_KERNEL);
 944         if (!dev)
 945                 return NULL;
 946         memset(dev, 0, sizeof(*dev));
 947
 948         dev->dev.parent = parent;
 949         dev->dev.bus = bus;
 950         dev->dev.release = of_release_dev;
 951
 952         strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
 953
 954         if (of_device_register(dev) != 0) {
 955                 kfree(dev);
 956                 return NULL;
 957         }
 958
 959         return dev;
 960 }
 961
 962 EXPORT_SYMBOL(of_match_device);
 963 EXPORT_SYMBOL(of_register_driver);
 964 EXPORT_SYMBOL(of_unregister_driver);
 965 EXPORT_SYMBOL(of_device_register);
 966 EXPORT_SYMBOL(of_device_unregister);
 967 EXPORT_SYMBOL(of_dev_get);
 968 EXPORT_SYMBOL(of_dev_put);
 969 EXPORT_SYMBOL(of_platform_device_create);
 970 EXPORT_SYMBOL(of_release_dev);