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(struct resource *res, void __iomem *base, unsigned long size)
 148 {
 149         if (res->flags & IORESOURCE_MEM)
 150                 release_mem_region((unsigned long) base, size);
 151         else
 152                 release_region((unsigned long) base, size);
 153 }
 154 EXPORT_SYMBOL(of_iounmap);
 155
 156 static int node_match(struct device *dev, void *data)
 157 {
 158         struct of_device *op = to_of_device(dev);
 159         struct device_node *dp = data;
 160
 161         return (op->node == dp);
 162 }
 163
 164 struct of_device *of_find_device_by_node(struct device_node *dp)
 165 {
 166         struct device *dev = bus_find_device(&of_bus_type, NULL,
 167                                              dp, node_match);
 168
 169         if (dev)
 170                 return to_of_device(dev);
 171
 172         return NULL;
 173 }
 174 EXPORT_SYMBOL(of_find_device_by_node);
 175
 176 #ifdef CONFIG_PCI
 177 struct bus_type isa_bus_type = {
 178        .name    = "isa",
 179        .match   = of_platform_bus_match,
 180        .probe   = of_device_probe,
 181        .remove  = of_device_remove,
 182        .suspend = of_device_suspend,
 183        .resume  = of_device_resume,
 184 };
 185 EXPORT_SYMBOL(isa_bus_type);
 186
 187 struct bus_type ebus_bus_type = {
 188        .name    = "ebus",
 189        .match   = of_platform_bus_match,
 190        .probe   = of_device_probe,
 191        .remove  = of_device_remove,
 192        .suspend = of_device_suspend,
 193        .resume  = of_device_resume,
 194 };
 195 EXPORT_SYMBOL(ebus_bus_type);
 196 #endif
 197
 198 #ifdef CONFIG_SBUS
 199 struct bus_type sbus_bus_type = {
 200        .name    = "sbus",
 201        .match   = of_platform_bus_match,
 202        .probe   = of_device_probe,
 203        .remove  = of_device_remove,
 204        .suspend = of_device_suspend,
 205        .resume  = of_device_resume,
 206 };
 207 EXPORT_SYMBOL(sbus_bus_type);
 208 #endif
 209
 210 struct bus_type of_bus_type = {
 211        .name    = "of",
 212        .match   = of_platform_bus_match,
 213        .probe   = of_device_probe,
 214        .remove  = of_device_remove,
 215        .suspend = of_device_suspend,
 216        .resume  = of_device_resume,
 217 };
 218 EXPORT_SYMBOL(of_bus_type);
 219
 220 static inline u64 of_read_addr(const u32 *cell, int size)
 221 {
 222         u64 r = 0;
 223         while (size--)
 224                 r = (r << 32) | *(cell++);
 225         return r;
 226 }
 227
 228 static void __init get_cells(struct device_node *dp,
 229                              int *addrc, int *sizec)
 230 {
 231         if (addrc)
 232                 *addrc = of_n_addr_cells(dp);
 233         if (sizec)
 234                 *sizec = of_n_size_cells(dp);
 235 }
 236
 237 /* Max address size we deal with */
 238 #define OF_MAX_ADDR_CELLS       4
 239
 240 struct of_bus {
 241         const char      *name;
 242         const char      *addr_prop_name;
 243         int             (*match)(struct device_node *parent);
 244         void            (*count_cells)(struct device_node *child,
 245                                        int *addrc, int *sizec);
 246         int             (*map)(u32 *addr, const u32 *range,
 247                                int na, int ns, int pna);
 248         unsigned int    (*get_flags)(u32 *addr);
 249 };
 250
 251 /*
 252  * Default translator (generic bus)
 253  */
 254
 255 static void of_bus_default_count_cells(struct device_node *dev,
 256                                        int *addrc, int *sizec)
 257 {
 258         get_cells(dev, addrc, sizec);
 259 }
 260
 261 /* Make sure the least significant 64-bits are in-range.  Even
 262  * for 3 or 4 cell values it is a good enough approximation.
 263  */
 264 static int of_out_of_range(const u32 *addr, const u32 *base,
 265                            const u32 *size, int na, int ns)
 266 {
 267         u64 a = of_read_addr(addr, na);
 268         u64 b = of_read_addr(base, na);
 269
 270         if (a < b)
 271                 return 1;
 272
 273         b += of_read_addr(size, ns);
 274         if (a >= b)
 275                 return 1;
 276
 277         return 0;
 278 }
 279
 280 static int of_bus_default_map(u32 *addr, const u32 *range,
 281                               int na, int ns, int pna)
 282 {
 283         u32 result[OF_MAX_ADDR_CELLS];
 284         int i;
 285
 286         if (ns > 2) {
 287                 printk("of_device: Cannot handle size cells (%d) > 2.", ns);
 288                 return -EINVAL;
 289         }
 290
 291         if (of_out_of_range(addr, range, range + na + pna, na, ns))
 292                 return -EINVAL;
 293
 294         /* Start with the parent range base.  */
 295         memcpy(result, range + na, pna * 4);
 296
 297         /* Add in the child address offset.  */
 298         for (i = 0; i < na; i++)
 299                 result[pna - 1 - i] +=
 300                         (addr[na - 1 - i] -
 301                          range[na - 1 - i]);
 302
 303         memcpy(addr, result, pna * 4);
 304
 305         return 0;
 306 }
 307
 308 static unsigned int of_bus_default_get_flags(u32 *addr)
 309 {
 310         return IORESOURCE_MEM;
 311 }
 312
 313 /*
 314  * PCI bus specific translator
 315  */
 316
 317 static int of_bus_pci_match(struct device_node *np)
 318 {
 319         if (!strcmp(np->type, "pci") || !strcmp(np->type, "pciex")) {
 320                 /* Do not do PCI specific frobbing if the
 321                  * PCI bridge lacks a ranges property.  We
 322                  * want to pass it through up to the next
 323                  * parent as-is, not with the PCI translate
 324                  * method which chops off the top address cell.
 325                  */
 326                 if (!of_find_property(np, "ranges", NULL))
 327                         return 0;
 328
 329                 return 1;
 330         }
 331
 332         return 0;
 333 }
 334
 335 static void of_bus_pci_count_cells(struct device_node *np,
 336                                    int *addrc, int *sizec)
 337 {
 338         if (addrc)
 339                 *addrc = 3;
 340         if (sizec)
 341                 *sizec = 2;
 342 }
 343
 344 static int of_bus_pci_map(u32 *addr, const u32 *range,
 345                           int na, int ns, int pna)
 346 {
 347         u32 result[OF_MAX_ADDR_CELLS];
 348         int i;
 349
 350         /* Check address type match */
 351         if ((addr[0] ^ range[0]) & 0x03000000)
 352                 return -EINVAL;
 353
 354         if (of_out_of_range(addr + 1, range + 1, range + na + pna,
 355                             na - 1, ns))
 356                 return -EINVAL;
 357
 358         /* Start with the parent range base.  */
 359         memcpy(result, range + na, pna * 4);
 360
 361         /* Add in the child address offset, skipping high cell.  */
 362         for (i = 0; i < na - 1; i++)
 363                 result[pna - 1 - i] +=
 364                         (addr[na - 1 - i] -
 365                          range[na - 1 - i]);
 366
 367         memcpy(addr, result, pna * 4);
 368
 369         return 0;
 370 }
 371
 372 static unsigned int of_bus_pci_get_flags(u32 *addr)
 373 {
 374         unsigned int flags = 0;
 375         u32 w = addr[0];
 376
 377         switch((w >> 24) & 0x03) {
 378         case 0x01:
 379                 flags |= IORESOURCE_IO;
 380         case 0x02: /* 32 bits */
 381         case 0x03: /* 64 bits */
 382                 flags |= IORESOURCE_MEM;
 383         }
 384         if (w & 0x40000000)
 385                 flags |= IORESOURCE_PREFETCH;
 386         return flags;
 387 }
 388
 389 /*
 390  * SBUS bus specific translator
 391  */
 392
 393 static int of_bus_sbus_match(struct device_node *np)
 394 {
 395         return !strcmp(np->name, "sbus") ||
 396                 !strcmp(np->name, "sbi");
 397 }
 398
 399 static void of_bus_sbus_count_cells(struct device_node *child,
 400                                    int *addrc, int *sizec)
 401 {
 402         if (addrc)
 403                 *addrc = 2;
 404         if (sizec)
 405                 *sizec = 1;
 406 }
 407
 408 /*
 409  * FHC/Central bus specific translator.
 410  *
 411  * This is just needed to hard-code the address and size cell
 412  * counts.  'fhc' and 'central' nodes lack the #address-cells and
 413  * #size-cells properties, and if you walk to the root on such
 414  * Enterprise boxes all you'll get is a #size-cells of 2 which is
 415  * not what we want to use.
 416  */
 417 static int of_bus_fhc_match(struct device_node *np)
 418 {
 419         return !strcmp(np->name, "fhc") ||
 420                 !strcmp(np->name, "central");
 421 }
 422
 423 #define of_bus_fhc_count_cells of_bus_sbus_count_cells
 424
 425 /*
 426  * Array of bus specific translators
 427  */
 428
 429 static struct of_bus of_busses[] = {
 430         /* PCI */
 431         {
 432                 .name = "pci",
 433                 .addr_prop_name = "assigned-addresses",
 434                 .match = of_bus_pci_match,
 435                 .count_cells = of_bus_pci_count_cells,
 436                 .map = of_bus_pci_map,
 437                 .get_flags = of_bus_pci_get_flags,
 438         },
 439         /* SBUS */
 440         {
 441                 .name = "sbus",
 442                 .addr_prop_name = "reg",
 443                 .match = of_bus_sbus_match,
 444                 .count_cells = of_bus_sbus_count_cells,
 445                 .map = of_bus_default_map,
 446                 .get_flags = of_bus_default_get_flags,
 447         },
 448         /* FHC */
 449         {
 450                 .name = "fhc",
 451                 .addr_prop_name = "reg",
 452                 .match = of_bus_fhc_match,
 453                 .count_cells = of_bus_fhc_count_cells,
 454                 .map = of_bus_default_map,
 455                 .get_flags = of_bus_default_get_flags,
 456         },
 457         /* Default */
 458         {
 459                 .name = "default",
 460                 .addr_prop_name = "reg",
 461                 .match = NULL,
 462                 .count_cells = of_bus_default_count_cells,
 463                 .map = of_bus_default_map,
 464                 .get_flags = of_bus_default_get_flags,
 465         },
 466 };
 467
 468 static struct of_bus *of_match_bus(struct device_node *np)
 469 {
 470         int i;
 471
 472         for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
 473                 if (!of_busses[i].match || of_busses[i].match(np))
 474                         return &of_busses[i];
 475         BUG();
 476         return NULL;
 477 }
 478
 479 static int __init build_one_resource(struct device_node *parent,
 480                                      struct of_bus *bus,
 481                                      struct of_bus *pbus,
 482                                      u32 *addr,
 483                                      int na, int ns, int pna)
 484 {
 485         u32 *ranges;
 486         unsigned int rlen;
 487         int rone;
 488
 489         ranges = of_get_property(parent, "ranges", &rlen);
 490         if (ranges == NULL || rlen == 0) {
 491                 u32 result[OF_MAX_ADDR_CELLS];
 492                 int i;
 493
 494                 memset(result, 0, pna * 4);
 495                 for (i = 0; i < na; i++)
 496                         result[pna - 1 - i] =
 497                                 addr[na - 1 - i];
 498
 499                 memcpy(addr, result, pna * 4);
 500                 return 0;
 501         }
 502
 503         /* Now walk through the ranges */
 504         rlen /= 4;
 505         rone = na + pna + ns;
 506         for (; rlen >= rone; rlen -= rone, ranges += rone) {
 507                 if (!bus->map(addr, ranges, na, ns, pna))
 508                         return 0;
 509         }
 510
 511         return 1;
 512 }
 513
 514 static int __init use_1to1_mapping(struct device_node *pp)
 515 {
 516         char *model;
 517
 518         /* If this is on the PMU bus, don't try to translate it even
 519          * if a ranges property exists.
 520          */
 521         if (!strcmp(pp->name, "pmu"))
 522                 return 1;
 523
 524         /* If we have a ranges property in the parent, use it.  */
 525         if (of_find_property(pp, "ranges", NULL) != NULL)
 526                 return 0;
 527
 528         /* If the parent is the dma node of an ISA bus, pass
 529          * the translation up to the root.
 530          */
 531         if (!strcmp(pp->name, "dma"))
 532                 return 0;
 533
 534         /* Similarly for Simba PCI bridges.  */
 535         model = of_get_property(pp, "model", NULL);
 536         if (model && !strcmp(model, "SUNW,simba"))
 537                 return 0;
 538
 539         return 1;
 540 }
 541
 542 static int of_resource_verbose;
 543
 544 static void __init build_device_resources(struct of_device *op,
 545                                           struct device *parent)
 546 {
 547         struct of_device *p_op;
 548         struct of_bus *bus;
 549         int na, ns;
 550         int index, num_reg;
 551         void *preg;
 552
 553         if (!parent)
 554                 return;
 555
 556         p_op = to_of_device(parent);
 557         bus = of_match_bus(p_op->node);
 558         bus->count_cells(op->node, &na, &ns);
 559
 560         preg = of_get_property(op->node, bus->addr_prop_name, &num_reg);
 561         if (!preg || num_reg == 0)
 562                 return;
 563
 564         /* Convert to num-cells.  */
 565         num_reg /= 4;
 566
 567         /* Convert to num-entries.  */
 568         num_reg /= na + ns;
 569
 570         /* Prevent overruning the op->resources[] array.  */
 571         if (num_reg > PROMREG_MAX) {
 572                 printk(KERN_WARNING "%s: Too many regs (%d), "
 573                        "limiting to %d.\n",
 574                        op->node->full_name, num_reg, PROMREG_MAX);
 575                 num_reg = PROMREG_MAX;
 576         }
 577
 578         for (index = 0; index < num_reg; index++) {
 579                 struct resource *r = &op->resource[index];
 580                 u32 addr[OF_MAX_ADDR_CELLS];
 581                 u32 *reg = (preg + (index * ((na + ns) * 4)));
 582                 struct device_node *dp = op->node;
 583                 struct device_node *pp = p_op->node;
 584                 struct of_bus *pbus, *dbus;
 585                 u64 size, result = OF_BAD_ADDR;
 586                 unsigned long flags;
 587                 int dna, dns;
 588                 int pna, pns;
 589
 590                 size = of_read_addr(reg + na, ns);
 591                 flags = bus->get_flags(reg);
 592
 593                 memcpy(addr, reg, na * 4);
 594
 595                 if (use_1to1_mapping(pp)) {
 596                         result = of_read_addr(addr, na);
 597                         goto build_res;
 598                 }
 599
 600                 dna = na;
 601                 dns = ns;
 602                 dbus = bus;
 603
 604                 while (1) {
 605                         dp = pp;
 606                         pp = dp->parent;
 607                         if (!pp) {
 608                                 result = of_read_addr(addr, dna);
 609                                 break;
 610                         }
 611
 612                         pbus = of_match_bus(pp);
 613                         pbus->count_cells(dp, &pna, &pns);
 614
 615                         if (build_one_resource(dp, dbus, pbus, addr,
 616                                                dna, dns, pna))
 617                                 break;
 618
 619                         dna = pna;
 620                         dns = pns;
 621                         dbus = pbus;
 622                 }
 623
 624         build_res:
 625                 memset(r, 0, sizeof(*r));
 626
 627                 if (of_resource_verbose)
 628                         printk("%s reg[%d] -> %lx\n",
 629                                op->node->full_name, index,
 630                                result);
 631
 632                 if (result != OF_BAD_ADDR) {
 633                         if (tlb_type == hypervisor)
 634                                 result &= 0x0fffffffffffffffUL;
 635
 636                         r->start = result;
 637                         r->end = result + size - 1;
 638                         r->flags = flags;
 639                 }
 640                 r->name = op->node->name;
 641         }
 642 }
 643
 644 static struct device_node * __init
 645 apply_interrupt_map(struct device_node *dp, struct device_node *pp,
 646                     u32 *imap, int imlen, u32 *imask,
 647                     unsigned int *irq_p)
 648 {
 649         struct device_node *cp;
 650         unsigned int irq = *irq_p;
 651         struct of_bus *bus;
 652         phandle handle;
 653         u32 *reg;
 654         int na, num_reg, i;
 655
 656         bus = of_match_bus(pp);
 657         bus->count_cells(dp, &na, NULL);
 658
 659         reg = of_get_property(dp, "reg", &num_reg);
 660         if (!reg || !num_reg)
 661                 return NULL;
 662
 663         imlen /= ((na + 3) * 4);
 664         handle = 0;
 665         for (i = 0; i < imlen; i++) {
 666                 int j;
 667
 668                 for (j = 0; j < na; j++) {
 669                         if ((reg[j] & imask[j]) != imap[j])
 670                                 goto next;
 671                 }
 672                 if (imap[na] == irq) {
 673                         handle = imap[na + 1];
 674                         irq = imap[na + 2];
 675                         break;
 676                 }
 677
 678         next:
 679                 imap += (na + 3);
 680         }
 681         if (i == imlen) {
 682                 /* Psycho and Sabre PCI controllers can have 'interrupt-map'
 683                  * properties that do not include the on-board device
 684                  * interrupts.  Instead, the device's 'interrupts' property
 685                  * is already a fully specified INO value.
 686                  *
 687                  * Handle this by deciding that, if we didn't get a
 688                  * match in the parent's 'interrupt-map', and the
 689                  * parent is an IRQ translater, then use the parent as
 690                  * our IRQ controller.
 691                  */
 692                 if (pp->irq_trans)
 693                         return pp;
 694
 695                 return NULL;
 696         }
 697
 698         *irq_p = irq;
 699         cp = of_find_node_by_phandle(handle);
 700
 701         return cp;
 702 }
 703
 704 static unsigned int __init pci_irq_swizzle(struct device_node *dp,
 705                                            struct device_node *pp,
 706                                            unsigned int irq)
 707 {
 708         struct linux_prom_pci_registers *regs;
 709         unsigned int bus, devfn, slot, ret;
 710
 711         if (irq < 1 || irq > 4)
 712                 return irq;
 713
 714         regs = of_get_property(dp, "reg", NULL);
 715         if (!regs)
 716                 return irq;
 717
 718         bus = (regs->phys_hi >> 16) & 0xff;
 719         devfn = (regs->phys_hi >> 8) & 0xff;
 720         slot = (devfn >> 3) & 0x1f;
 721
 722         if (pp->irq_trans) {
 723                 /* Derived from Table 8-3, U2P User's Manual.  This branch
 724                  * is handling a PCI controller that lacks a proper set of
 725                  * interrupt-map and interrupt-map-mask properties.  The
 726                  * Ultra-E450 is one example.
 727                  *
 728                  * The bit layout is BSSLL, where:
 729                  * B: 0 on bus A, 1 on bus B
 730                  * D: 2-bit slot number, derived from PCI device number as
 731                  *    (dev - 1) for bus A, or (dev - 2) for bus B
 732                  * L: 2-bit line number
 733                  *
 734                  * Actually, more "portable" way to calculate the funky
 735                  * slot number is to subtract pbm->pci_first_slot from the
 736                  * device number, and that's exactly what the pre-OF
 737                  * sparc64 code did, but we're building this stuff generically
 738                  * using the OBP tree, not in the PCI controller layer.
 739                  */
 740                 if (bus & 0x80) {
 741                         /* PBM-A */
 742                         bus  = 0x00;
 743                         slot = (slot - 1) << 2;
 744                 } else {
 745                         /* PBM-B */
 746                         bus  = 0x10;
 747                         slot = (slot - 2) << 2;
 748                 }
 749                 irq -= 1;
 750
 751                 ret = (bus | slot | irq);
 752         } else {
 753                 /* Going through a PCI-PCI bridge that lacks a set of
 754                  * interrupt-map and interrupt-map-mask properties.
 755                  */
 756                 ret = ((irq - 1 + (slot & 3)) & 3) + 1;
 757         }
 758
 759         return ret;
 760 }
 761
 762 static int of_irq_verbose;
 763
 764 static unsigned int __init build_one_device_irq(struct of_device *op,
 765                                                 struct device *parent,
 766                                                 unsigned int irq)
 767 {
 768         struct device_node *dp = op->node;
 769         struct device_node *pp, *ip;
 770         unsigned int orig_irq = irq;
 771
 772         if (irq == 0xffffffff)
 773                 return irq;
 774
 775         if (dp->irq_trans) {
 776                 irq = dp->irq_trans->irq_build(dp, irq,
 777                                                dp->irq_trans->data);
 778
 779                 if (of_irq_verbose)
 780                         printk("%s: direct translate %x --> %x\n",
 781                                dp->full_name, orig_irq, irq);
 782
 783                 return irq;
 784         }
 785
 786         /* Something more complicated.  Walk up to the root, applying
 787          * interrupt-map or bus specific translations, until we hit
 788          * an IRQ translator.
 789          *
 790          * If we hit a bus type or situation we cannot handle, we
 791          * stop and assume that the original IRQ number was in a
 792          * format which has special meaning to it's immediate parent.
 793          */
 794         pp = dp->parent;
 795         ip = NULL;
 796         while (pp) {
 797                 void *imap, *imsk;
 798                 int imlen;
 799
 800                 imap = of_get_property(pp, "interrupt-map", &imlen);
 801                 imsk = of_get_property(pp, "interrupt-map-mask", NULL);
 802                 if (imap && imsk) {
 803                         struct device_node *iret;
 804                         int this_orig_irq = irq;
 805
 806                         iret = apply_interrupt_map(dp, pp,
 807                                                    imap, imlen, imsk,
 808                                                    &irq);
 809
 810                         if (of_irq_verbose)
 811                                 printk("%s: Apply [%s:%x] imap --> [%s:%x]\n",
 812                                        op->node->full_name,
 813                                        pp->full_name, this_orig_irq,
 814                                        (iret ? iret->full_name : "NULL"), irq);
 815
 816                         if (!iret)
 817                                 break;
 818
 819                         if (iret->irq_trans) {
 820                                 ip = iret;
 821                                 break;
 822                         }
 823                 } else {
 824                         if (!strcmp(pp->type, "pci") ||
 825                             !strcmp(pp->type, "pciex")) {
 826                                 unsigned int this_orig_irq = irq;
 827
 828                                 irq = pci_irq_swizzle(dp, pp, irq);
 829                                 if (of_irq_verbose)
 830                                         printk("%s: PCI swizzle [%s] "
 831                                                "%x --> %x\n",
 832                                                op->node->full_name,
 833                                                pp->full_name, this_orig_irq,
 834                                                irq);
 835
 836                         }
 837
 838                         if (pp->irq_trans) {
 839                                 ip = pp;
 840                                 break;
 841                         }
 842                 }
 843                 dp = pp;
 844                 pp = pp->parent;
 845         }
 846         if (!ip)
 847                 return orig_irq;
 848
 849         irq = ip->irq_trans->irq_build(op->node, irq,
 850                                        ip->irq_trans->data);
 851         if (of_irq_verbose)
 852                 printk("%s: Apply IRQ trans [%s] %x --> %x\n",
 853                        op->node->full_name, ip->full_name, orig_irq, irq);
 854
 855         return irq;
 856 }
 857
 858 static struct of_device * __init scan_one_device(struct device_node *dp,
 859                                                  struct device *parent)
 860 {
 861         struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
 862         unsigned int *irq;
 863         int len, i;
 864
 865         if (!op)
 866                 return NULL;
 867
 868         op->node = dp;
 869
 870         op->clock_freq = of_getintprop_default(dp, "clock-frequency",
 871                                                (25*1000*1000));
 872         op->portid = of_getintprop_default(dp, "upa-portid", -1);
 873         if (op->portid == -1)
 874                 op->portid = of_getintprop_default(dp, "portid", -1);
 875
 876         irq = of_get_property(dp, "interrupts", &len);
 877         if (irq) {
 878                 memcpy(op->irqs, irq, len);
 879                 op->num_irqs = len / 4;
 880         } else {
 881                 op->num_irqs = 0;
 882         }
 883
 884         /* Prevent overruning the op->irqs[] array.  */
 885         if (op->num_irqs > PROMINTR_MAX) {
 886                 printk(KERN_WARNING "%s: Too many irqs (%d), "
 887                        "limiting to %d.\n",
 888                        dp->full_name, op->num_irqs, PROMINTR_MAX);
 889                 op->num_irqs = PROMINTR_MAX;
 890         }
 891
 892         build_device_resources(op, parent);
 893         for (i = 0; i < op->num_irqs; i++)
 894                 op->irqs[i] = build_one_device_irq(op, parent, op->irqs[i]);
 895
 896         op->dev.parent = parent;
 897         op->dev.bus = &of_bus_type;
 898         if (!parent)
 899                 strcpy(op->dev.bus_id, "root");
 900         else
 901                 sprintf(op->dev.bus_id, "%08x", dp->node);
 902
 903         if (of_device_register(op)) {
 904                 printk("%s: Could not register of device.\n",
 905                        dp->full_name);
 906                 kfree(op);
 907                 op = NULL;
 908         }
 909
 910         return op;
 911 }
 912
 913 static void __init scan_tree(struct device_node *dp, struct device *parent)
 914 {
 915         while (dp) {
 916                 struct of_device *op = scan_one_device(dp, parent);
 917
 918                 if (op)
 919                         scan_tree(dp->child, &op->dev);
 920
 921                 dp = dp->sibling;
 922         }
 923 }
 924
 925 static void __init scan_of_devices(void)
 926 {
 927         struct device_node *root = of_find_node_by_path("/");
 928         struct of_device *parent;
 929
 930         parent = scan_one_device(root, NULL);
 931         if (!parent)
 932                 return;
 933
 934         scan_tree(root->child, &parent->dev);
 935 }
 936
 937 static int __init of_bus_driver_init(void)
 938 {
 939         int err;
 940
 941         err = bus_register(&of_bus_type);
 942 #ifdef CONFIG_PCI
 943         if (!err)
 944                 err = bus_register(&isa_bus_type);
 945         if (!err)
 946                 err = bus_register(&ebus_bus_type);
 947 #endif
 948 #ifdef CONFIG_SBUS
 949         if (!err)
 950                 err = bus_register(&sbus_bus_type);
 951 #endif
 952
 953         if (!err)
 954                 scan_of_devices();
 955
 956         return err;
 957 }
 958
 959 postcore_initcall(of_bus_driver_init);
 960
 961 static int __init of_debug(char *str)
 962 {
 963         int val = 0;
 964
 965         get_option(&str, &val);
 966         if (val & 1)
 967                 of_resource_verbose = 1;
 968         if (val & 2)
 969                 of_irq_verbose = 1;
 970         return 1;
 971 }
 972
 973 __setup("of_debug=", of_debug);
 974
 975 int of_register_driver(struct of_platform_driver *drv, struct bus_type *bus)
 976 {
 977         /* initialize common driver fields */
 978         drv->driver.name = drv->name;
 979         drv->driver.bus = bus;
 980
 981         /* register with core */
 982         return driver_register(&drv->driver);
 983 }
 984
 985 void of_unregister_driver(struct of_platform_driver *drv)
 986 {
 987         driver_unregister(&drv->driver);
 988 }
 989
 990
 991 static ssize_t dev_show_devspec(struct device *dev, struct device_attribute *attr, char *buf)
 992 {
 993         struct of_device *ofdev;
 994
 995         ofdev = to_of_device(dev);
 996         return sprintf(buf, "%s", ofdev->node->full_name);
 997 }
 998
 999 static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL);
1000
1001 /**
1002  * of_release_dev - free an of device structure when all users of it are finished.
1003  * @dev: device that's been disconnected
1004  *
1005  * Will be called only by the device core when all users of this of device are
1006  * done.
1007  */
1008 void of_release_dev(struct device *dev)
1009 {
1010         struct of_device *ofdev;
1011
1012         ofdev = to_of_device(dev);
1013
1014         kfree(ofdev);
1015 }
1016
1017 int of_device_register(struct of_device *ofdev)
1018 {
1019         int rc;
1020
1021         BUG_ON(ofdev->node == NULL);
1022
1023         rc = device_register(&ofdev->dev);
1024         if (rc)
1025                 return rc;
1026
1027         rc = device_create_file(&ofdev->dev, &dev_attr_devspec);
1028         if (rc)
1029                 device_unregister(&ofdev->dev);
1030
1031         return rc;
1032 }
1033
1034 void of_device_unregister(struct of_device *ofdev)
1035 {
1036         device_remove_file(&ofdev->dev, &dev_attr_devspec);
1037         device_unregister(&ofdev->dev);
1038 }
1039
1040 struct of_device* of_platform_device_create(struct device_node *np,
1041                                             const char *bus_id,
1042                                             struct device *parent,
1043                                             struct bus_type *bus)
1044 {
1045         struct of_device *dev;
1046
1047         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1048         if (!dev)
1049                 return NULL;
1050
1051         dev->dev.parent = parent;
1052         dev->dev.bus = bus;
1053         dev->dev.release = of_release_dev;
1054
1055         strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
1056
1057         if (of_device_register(dev) != 0) {
1058                 kfree(dev);
1059                 return NULL;
1060         }
1061
1062         return dev;
1063 }
1064
1065 EXPORT_SYMBOL(of_match_device);
1066 EXPORT_SYMBOL(of_register_driver);
1067 EXPORT_SYMBOL(of_unregister_driver);
1068 EXPORT_SYMBOL(of_device_register);
1069 EXPORT_SYMBOL(of_device_unregister);
1070 EXPORT_SYMBOL(of_dev_get);
1071 EXPORT_SYMBOL(of_dev_put);
1072 EXPORT_SYMBOL(of_platform_device_create);
1073 EXPORT_SYMBOL(of_release_dev);