arch/sparc64/kernel/of_device.c

   1 #include <linux/string.h>
   2 #include <linux/kernel.h>
   3 #include <linux/of.h>
   4 #include <linux/init.h>
   5 #include <linux/module.h>
   6 #include <linux/mod_devicetable.h>
   7 #include <linux/slab.h>
   8 #include <linux/errno.h>
   9 #include <linux/irq.h>
  10 #include <linux/of_device.h>
  11 #include <linux/of_platform.h>
  12
  13 void __iomem *of_ioremap(struct resource *res, unsigned long offset, unsigned long size, char *name)
  14 {
  15         unsigned long ret = res->start + offset;
  16         struct resource *r;
  17
  18         if (res->flags & IORESOURCE_MEM)
  19                 r = request_mem_region(ret, size, name);
  20         else
  21                 r = request_region(ret, size, name);
  22         if (!r)
  23                 ret = 0;
  24
  25         return (void __iomem *) ret;
  26 }
  27 EXPORT_SYMBOL(of_ioremap);
  28
  29 void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
  30 {
  31         if (res->flags & IORESOURCE_MEM)
  32                 release_mem_region((unsigned long) base, size);
  33         else
  34                 release_region((unsigned long) base, size);
  35 }
  36 EXPORT_SYMBOL(of_iounmap);
  37
  38 static int node_match(struct device *dev, void *data)
  39 {
  40         struct of_device *op = to_of_device(dev);
  41         struct device_node *dp = data;
  42
  43         return (op->node == dp);
  44 }
  45
  46 struct of_device *of_find_device_by_node(struct device_node *dp)
  47 {
  48         struct device *dev = bus_find_device(&of_platform_bus_type, NULL,
  49                                              dp, node_match);
  50
  51         if (dev)
  52                 return to_of_device(dev);
  53
  54         return NULL;
  55 }
  56 EXPORT_SYMBOL(of_find_device_by_node);
  57
  58 #ifdef CONFIG_PCI
  59 struct bus_type isa_bus_type;
  60 EXPORT_SYMBOL(isa_bus_type);
  61
  62 struct bus_type ebus_bus_type;
  63 EXPORT_SYMBOL(ebus_bus_type);
  64 #endif
  65
  66 #ifdef CONFIG_SBUS
  67 struct bus_type sbus_bus_type;
  68 EXPORT_SYMBOL(sbus_bus_type);
  69 #endif
  70
  71 struct bus_type of_platform_bus_type;
  72 EXPORT_SYMBOL(of_platform_bus_type);
  73
  74 static inline u64 of_read_addr(const u32 *cell, int size)
  75 {
  76         u64 r = 0;
  77         while (size--)
  78                 r = (r << 32) | *(cell++);
  79         return r;
  80 }
  81
  82 static void __init get_cells(struct device_node *dp,
  83                              int *addrc, int *sizec)
  84 {
  85         if (addrc)
  86                 *addrc = of_n_addr_cells(dp);
  87         if (sizec)
  88                 *sizec = of_n_size_cells(dp);
  89 }
  90
  91 /* Max address size we deal with */
  92 #define OF_MAX_ADDR_CELLS       4
  93
  94 struct of_bus {
  95         const char      *name;
  96         const char      *addr_prop_name;
  97         int             (*match)(struct device_node *parent);
  98         void            (*count_cells)(struct device_node *child,
  99                                        int *addrc, int *sizec);
 100         int             (*map)(u32 *addr, const u32 *range,
 101                                int na, int ns, int pna);
 102         unsigned int    (*get_flags)(const u32 *addr);
 103 };
 104
 105 /*
 106  * Default translator (generic bus)
 107  */
 108
 109 static void of_bus_default_count_cells(struct device_node *dev,
 110                                        int *addrc, int *sizec)
 111 {
 112         get_cells(dev, addrc, sizec);
 113 }
 114
 115 /* Make sure the least significant 64-bits are in-range.  Even
 116  * for 3 or 4 cell values it is a good enough approximation.
 117  */
 118 static int of_out_of_range(const u32 *addr, const u32 *base,
 119                            const u32 *size, int na, int ns)
 120 {
 121         u64 a = of_read_addr(addr, na);
 122         u64 b = of_read_addr(base, na);
 123
 124         if (a < b)
 125                 return 1;
 126
 127         b += of_read_addr(size, ns);
 128         if (a >= b)
 129                 return 1;
 130
 131         return 0;
 132 }
 133
 134 static int of_bus_default_map(u32 *addr, const u32 *range,
 135                               int na, int ns, int pna)
 136 {
 137         u32 result[OF_MAX_ADDR_CELLS];
 138         int i;
 139
 140         if (ns > 2) {
 141                 printk("of_device: Cannot handle size cells (%d) > 2.", ns);
 142                 return -EINVAL;
 143         }
 144
 145         if (of_out_of_range(addr, range, range + na + pna, na, ns))
 146                 return -EINVAL;
 147
 148         /* Start with the parent range base.  */
 149         memcpy(result, range + na, pna * 4);
 150
 151         /* Add in the child address offset.  */
 152         for (i = 0; i < na; i++)
 153                 result[pna - 1 - i] +=
 154                         (addr[na - 1 - i] -
 155                          range[na - 1 - i]);
 156
 157         memcpy(addr, result, pna * 4);
 158
 159         return 0;
 160 }
 161
 162 static unsigned int of_bus_default_get_flags(const u32 *addr)
 163 {
 164         return IORESOURCE_MEM;
 165 }
 166
 167 /*
 168  * PCI bus specific translator
 169  */
 170
 171 static int of_bus_pci_match(struct device_node *np)
 172 {
 173         if (!strcmp(np->type, "pci") || !strcmp(np->type, "pciex")) {
 174                 const char *model = of_get_property(np, "model", NULL);
 175
 176                 if (model && !strcmp(model, "SUNW,simba"))
 177                         return 0;
 178
 179                 /* Do not do PCI specific frobbing if the
 180                  * PCI bridge lacks a ranges property.  We
 181                  * want to pass it through up to the next
 182                  * parent as-is, not with the PCI translate
 183                  * method which chops off the top address cell.
 184                  */
 185                 if (!of_find_property(np, "ranges", NULL))
 186                         return 0;
 187
 188                 return 1;
 189         }
 190
 191         return 0;
 192 }
 193
 194 static int of_bus_simba_match(struct device_node *np)
 195 {
 196         const char *model = of_get_property(np, "model", NULL);
 197
 198         if (model && !strcmp(model, "SUNW,simba"))
 199                 return 1;
 200
 201         /* Treat PCI busses lacking ranges property just like
 202          * simba.
 203          */
 204         if (!strcmp(np->type, "pci") || !strcmp(np->type, "pciex")) {
 205                 if (!of_find_property(np, "ranges", NULL))
 206                         return 1;
 207         }
 208
 209         return 0;
 210 }
 211
 212 static int of_bus_simba_map(u32 *addr, const u32 *range,
 213                             int na, int ns, int pna)
 214 {
 215         return 0;
 216 }
 217
 218 static void of_bus_pci_count_cells(struct device_node *np,
 219                                    int *addrc, int *sizec)
 220 {
 221         if (addrc)
 222                 *addrc = 3;
 223         if (sizec)
 224                 *sizec = 2;
 225 }
 226
 227 static int of_bus_pci_map(u32 *addr, const u32 *range,
 228                           int na, int ns, int pna)
 229 {
 230         u32 result[OF_MAX_ADDR_CELLS];
 231         int i;
 232
 233         /* Check address type match */
 234         if ((addr[0] ^ range[0]) & 0x03000000)
 235                 return -EINVAL;
 236
 237         if (of_out_of_range(addr + 1, range + 1, range + na + pna,
 238                             na - 1, ns))
 239                 return -EINVAL;
 240
 241         /* Start with the parent range base.  */
 242         memcpy(result, range + na, pna * 4);
 243
 244         /* Add in the child address offset, skipping high cell.  */
 245         for (i = 0; i < na - 1; i++)
 246                 result[pna - 1 - i] +=
 247                         (addr[na - 1 - i] -
 248                          range[na - 1 - i]);
 249
 250         memcpy(addr, result, pna * 4);
 251
 252         return 0;
 253 }
 254
 255 static unsigned int of_bus_pci_get_flags(const u32 *addr)
 256 {
 257         unsigned int flags = 0;
 258         u32 w = addr[0];
 259
 260         switch((w >> 24) & 0x03) {
 261         case 0x01:
 262                 flags |= IORESOURCE_IO;
 263         case 0x02: /* 32 bits */
 264         case 0x03: /* 64 bits */
 265                 flags |= IORESOURCE_MEM;
 266         }
 267         if (w & 0x40000000)
 268                 flags |= IORESOURCE_PREFETCH;
 269         return flags;
 270 }
 271
 272 /*
 273  * SBUS bus specific translator
 274  */
 275
 276 static int of_bus_sbus_match(struct device_node *np)
 277 {
 278         return !strcmp(np->name, "sbus") ||
 279                 !strcmp(np->name, "sbi");
 280 }
 281
 282 static void of_bus_sbus_count_cells(struct device_node *child,
 283                                    int *addrc, int *sizec)
 284 {
 285         if (addrc)
 286                 *addrc = 2;
 287         if (sizec)
 288                 *sizec = 1;
 289 }
 290
 291 /*
 292  * FHC/Central bus specific translator.
 293  *
 294  * This is just needed to hard-code the address and size cell
 295  * counts.  'fhc' and 'central' nodes lack the #address-cells and
 296  * #size-cells properties, and if you walk to the root on such
 297  * Enterprise boxes all you'll get is a #size-cells of 2 which is
 298  * not what we want to use.
 299  */
 300 static int of_bus_fhc_match(struct device_node *np)
 301 {
 302         return !strcmp(np->name, "fhc") ||
 303                 !strcmp(np->name, "central");
 304 }
 305
 306 #define of_bus_fhc_count_cells of_bus_sbus_count_cells
 307
 308 /*
 309  * Array of bus specific translators
 310  */
 311
 312 static struct of_bus of_busses[] = {
 313         /* PCI */
 314         {
 315                 .name = "pci",
 316                 .addr_prop_name = "assigned-addresses",
 317                 .match = of_bus_pci_match,
 318                 .count_cells = of_bus_pci_count_cells,
 319                 .map = of_bus_pci_map,
 320                 .get_flags = of_bus_pci_get_flags,
 321         },
 322         /* SIMBA */
 323         {
 324                 .name = "simba",
 325                 .addr_prop_name = "assigned-addresses",
 326                 .match = of_bus_simba_match,
 327                 .count_cells = of_bus_pci_count_cells,
 328                 .map = of_bus_simba_map,
 329                 .get_flags = of_bus_pci_get_flags,
 330         },
 331         /* SBUS */
 332         {
 333                 .name = "sbus",
 334                 .addr_prop_name = "reg",
 335                 .match = of_bus_sbus_match,
 336                 .count_cells = of_bus_sbus_count_cells,
 337                 .map = of_bus_default_map,
 338                 .get_flags = of_bus_default_get_flags,
 339         },
 340         /* FHC */
 341         {
 342                 .name = "fhc",
 343                 .addr_prop_name = "reg",
 344                 .match = of_bus_fhc_match,
 345                 .count_cells = of_bus_fhc_count_cells,
 346                 .map = of_bus_default_map,
 347                 .get_flags = of_bus_default_get_flags,
 348         },
 349         /* Default */
 350         {
 351                 .name = "default",
 352                 .addr_prop_name = "reg",
 353                 .match = NULL,
 354                 .count_cells = of_bus_default_count_cells,
 355                 .map = of_bus_default_map,
 356                 .get_flags = of_bus_default_get_flags,
 357         },
 358 };
 359
 360 static struct of_bus *of_match_bus(struct device_node *np)
 361 {
 362         int i;
 363
 364         for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
 365                 if (!of_busses[i].match || of_busses[i].match(np))
 366                         return &of_busses[i];
 367         BUG();
 368         return NULL;
 369 }
 370
 371 static int __init build_one_resource(struct device_node *parent,
 372                                      struct of_bus *bus,
 373                                      struct of_bus *pbus,
 374                                      u32 *addr,
 375                                      int na, int ns, int pna)
 376 {
 377         const u32 *ranges;
 378         unsigned int rlen;
 379         int rone;
 380
 381         ranges = of_get_property(parent, "ranges", &rlen);
 382         if (ranges == NULL || rlen == 0) {
 383                 u32 result[OF_MAX_ADDR_CELLS];
 384                 int i;
 385
 386                 memset(result, 0, pna * 4);
 387                 for (i = 0; i < na; i++)
 388                         result[pna - 1 - i] =
 389                                 addr[na - 1 - i];
 390
 391                 memcpy(addr, result, pna * 4);
 392                 return 0;
 393         }
 394
 395         /* Now walk through the ranges */
 396         rlen /= 4;
 397         rone = na + pna + ns;
 398         for (; rlen >= rone; rlen -= rone, ranges += rone) {
 399                 if (!bus->map(addr, ranges, na, ns, pna))
 400                         return 0;
 401         }
 402
 403         /* When we miss an I/O space match on PCI, just pass it up
 404          * to the next PCI bridge and/or controller.
 405          */
 406         if (!strcmp(bus->name, "pci") &&
 407             (addr[0] & 0x03000000) == 0x01000000)
 408                 return 0;
 409
 410         return 1;
 411 }
 412
 413 static int __init use_1to1_mapping(struct device_node *pp)
 414 {
 415         /* If we have a ranges property in the parent, use it.  */
 416         if (of_find_property(pp, "ranges", NULL) != NULL)
 417                 return 0;
 418
 419         /* If the parent is the dma node of an ISA bus, pass
 420          * the translation up to the root.
 421          */
 422         if (!strcmp(pp->name, "dma"))
 423                 return 0;
 424
 425         /* Similarly for all PCI bridges, if we get this far
 426          * it lacks a ranges property, and this will include
 427          * cases like Simba.
 428          */
 429         if (!strcmp(pp->type, "pci") || !strcmp(pp->type, "pciex"))
 430                 return 0;
 431
 432         return 1;
 433 }
 434
 435 static int of_resource_verbose;
 436
 437 static void __init build_device_resources(struct of_device *op,
 438                                           struct device *parent)
 439 {
 440         struct of_device *p_op;
 441         struct of_bus *bus;
 442         int na, ns;
 443         int index, num_reg;
 444         const void *preg;
 445
 446         if (!parent)
 447                 return;
 448
 449         p_op = to_of_device(parent);
 450         bus = of_match_bus(p_op->node);
 451         bus->count_cells(op->node, &na, &ns);
 452
 453         preg = of_get_property(op->node, bus->addr_prop_name, &num_reg);
 454         if (!preg || num_reg == 0)
 455                 return;
 456
 457         /* Convert to num-cells.  */
 458         num_reg /= 4;
 459
 460         /* Convert to num-entries.  */
 461         num_reg /= na + ns;
 462
 463         /* Prevent overrunning the op->resources[] array.  */
 464         if (num_reg > PROMREG_MAX) {
 465                 printk(KERN_WARNING "%s: Too many regs (%d), "
 466                        "limiting to %d.\n",
 467                        op->node->full_name, num_reg, PROMREG_MAX);
 468                 num_reg = PROMREG_MAX;
 469         }
 470
 471         for (index = 0; index < num_reg; index++) {
 472                 struct resource *r = &op->resource[index];
 473                 u32 addr[OF_MAX_ADDR_CELLS];
 474                 const u32 *reg = (preg + (index * ((na + ns) * 4)));
 475                 struct device_node *dp = op->node;
 476                 struct device_node *pp = p_op->node;
 477                 struct of_bus *pbus, *dbus;
 478                 u64 size, result = OF_BAD_ADDR;
 479                 unsigned long flags;
 480                 int dna, dns;
 481                 int pna, pns;
 482
 483                 size = of_read_addr(reg + na, ns);
 484                 flags = bus->get_flags(reg);
 485
 486                 memcpy(addr, reg, na * 4);
 487
 488                 if (use_1to1_mapping(pp)) {
 489                         result = of_read_addr(addr, na);
 490                         goto build_res;
 491                 }
 492
 493                 dna = na;
 494                 dns = ns;
 495                 dbus = bus;
 496
 497                 while (1) {
 498                         dp = pp;
 499                         pp = dp->parent;
 500                         if (!pp) {
 501                                 result = of_read_addr(addr, dna);
 502                                 break;
 503                         }
 504
 505                         pbus = of_match_bus(pp);
 506                         pbus->count_cells(dp, &pna, &pns);
 507
 508                         if (build_one_resource(dp, dbus, pbus, addr,
 509                                                dna, dns, pna))
 510                                 break;
 511
 512                         dna = pna;
 513                         dns = pns;
 514                         dbus = pbus;
 515                 }
 516
 517         build_res:
 518                 memset(r, 0, sizeof(*r));
 519
 520                 if (of_resource_verbose)
 521                         printk("%s reg[%d] -> %lx\n",
 522                                op->node->full_name, index,
 523                                result);
 524
 525                 if (result != OF_BAD_ADDR) {
 526                         if (tlb_type == hypervisor)
 527                                 result &= 0x0fffffffffffffffUL;
 528
 529                         r->start = result;
 530                         r->end = result + size - 1;
 531                         r->flags = flags;
 532                 }
 533                 r->name = op->node->name;
 534         }
 535 }
 536
 537 static struct device_node * __init
 538 apply_interrupt_map(struct device_node *dp, struct device_node *pp,
 539                     const u32 *imap, int imlen, const u32 *imask,
 540                     unsigned int *irq_p)
 541 {
 542         struct device_node *cp;
 543         unsigned int irq = *irq_p;
 544         struct of_bus *bus;
 545         phandle handle;
 546         const u32 *reg;
 547         int na, num_reg, i;
 548
 549         bus = of_match_bus(pp);
 550         bus->count_cells(dp, &na, NULL);
 551
 552         reg = of_get_property(dp, "reg", &num_reg);
 553         if (!reg || !num_reg)
 554                 return NULL;
 555
 556         imlen /= ((na + 3) * 4);
 557         handle = 0;
 558         for (i = 0; i < imlen; i++) {
 559                 int j;
 560
 561                 for (j = 0; j < na; j++) {
 562                         if ((reg[j] & imask[j]) != imap[j])
 563                                 goto next;
 564                 }
 565                 if (imap[na] == irq) {
 566                         handle = imap[na + 1];
 567                         irq = imap[na + 2];
 568                         break;
 569                 }
 570
 571         next:
 572                 imap += (na + 3);
 573         }
 574         if (i == imlen) {
 575                 /* Psycho and Sabre PCI controllers can have 'interrupt-map'
 576                  * properties that do not include the on-board device
 577                  * interrupts.  Instead, the device's 'interrupts' property
 578                  * is already a fully specified INO value.
 579                  *
 580                  * Handle this by deciding that, if we didn't get a
 581                  * match in the parent's 'interrupt-map', and the
 582                  * parent is an IRQ translater, then use the parent as
 583                  * our IRQ controller.
 584                  */
 585                 if (pp->irq_trans)
 586                         return pp;
 587
 588                 return NULL;
 589         }
 590
 591         *irq_p = irq;
 592         cp = of_find_node_by_phandle(handle);
 593
 594         return cp;
 595 }
 596
 597 static unsigned int __init pci_irq_swizzle(struct device_node *dp,
 598                                            struct device_node *pp,
 599                                            unsigned int irq)
 600 {
 601         const struct linux_prom_pci_registers *regs;
 602         unsigned int bus, devfn, slot, ret;
 603
 604         if (irq < 1 || irq > 4)
 605                 return irq;
 606
 607         regs = of_get_property(dp, "reg", NULL);
 608         if (!regs)
 609                 return irq;
 610
 611         bus = (regs->phys_hi >> 16) & 0xff;
 612         devfn = (regs->phys_hi >> 8) & 0xff;
 613         slot = (devfn >> 3) & 0x1f;
 614
 615         if (pp->irq_trans) {
 616                 /* Derived from Table 8-3, U2P User's Manual.  This branch
 617                  * is handling a PCI controller that lacks a proper set of
 618                  * interrupt-map and interrupt-map-mask properties.  The
 619                  * Ultra-E450 is one example.
 620                  *
 621                  * The bit layout is BSSLL, where:
 622                  * B: 0 on bus A, 1 on bus B
 623                  * D: 2-bit slot number, derived from PCI device number as
 624                  *    (dev - 1) for bus A, or (dev - 2) for bus B
 625                  * L: 2-bit line number
 626                  */
 627                 if (bus & 0x80) {
 628                         /* PBM-A */
 629                         bus  = 0x00;
 630                         slot = (slot - 1) << 2;
 631                 } else {
 632                         /* PBM-B */
 633                         bus  = 0x10;
 634                         slot = (slot - 2) << 2;
 635                 }
 636                 irq -= 1;
 637
 638                 ret = (bus | slot | irq);
 639         } else {
 640                 /* Going through a PCI-PCI bridge that lacks a set of
 641                  * interrupt-map and interrupt-map-mask properties.
 642                  */
 643                 ret = ((irq - 1 + (slot & 3)) & 3) + 1;
 644         }
 645
 646         return ret;
 647 }
 648
 649 static int of_irq_verbose;
 650
 651 static unsigned int __init build_one_device_irq(struct of_device *op,
 652                                                 struct device *parent,
 653                                                 unsigned int irq)
 654 {
 655         struct device_node *dp = op->node;
 656         struct device_node *pp, *ip;
 657         unsigned int orig_irq = irq;
 658         int nid;
 659
 660         if (irq == 0xffffffff)
 661                 return irq;
 662
 663         if (dp->irq_trans) {
 664                 irq = dp->irq_trans->irq_build(dp, irq,
 665                                                dp->irq_trans->data);
 666
 667                 if (of_irq_verbose)
 668                         printk("%s: direct translate %x --> %x\n",
 669                                dp->full_name, orig_irq, irq);
 670
 671                 goto out;
 672         }
 673
 674         /* Something more complicated.  Walk up to the root, applying
 675          * interrupt-map or bus specific translations, until we hit
 676          * an IRQ translator.
 677          *
 678          * If we hit a bus type or situation we cannot handle, we
 679          * stop and assume that the original IRQ number was in a
 680          * format which has special meaning to it's immediate parent.
 681          */
 682         pp = dp->parent;
 683         ip = NULL;
 684         while (pp) {
 685                 const void *imap, *imsk;
 686                 int imlen;
 687
 688                 imap = of_get_property(pp, "interrupt-map", &imlen);
 689                 imsk = of_get_property(pp, "interrupt-map-mask", NULL);
 690                 if (imap && imsk) {
 691                         struct device_node *iret;
 692                         int this_orig_irq = irq;
 693
 694                         iret = apply_interrupt_map(dp, pp,
 695                                                    imap, imlen, imsk,
 696                                                    &irq);
 697
 698                         if (of_irq_verbose)
 699                                 printk("%s: Apply [%s:%x] imap --> [%s:%x]\n",
 700                                        op->node->full_name,
 701                                        pp->full_name, this_orig_irq,
 702                                        (iret ? iret->full_name : "NULL"), irq);
 703
 704                         if (!iret)
 705                                 break;
 706
 707                         if (iret->irq_trans) {
 708                                 ip = iret;
 709                                 break;
 710                         }
 711                 } else {
 712                         if (!strcmp(pp->type, "pci") ||
 713                             !strcmp(pp->type, "pciex")) {
 714                                 unsigned int this_orig_irq = irq;
 715
 716                                 irq = pci_irq_swizzle(dp, pp, irq);
 717                                 if (of_irq_verbose)
 718                                         printk("%s: PCI swizzle [%s] "
 719                                                "%x --> %x\n",
 720                                                op->node->full_name,
 721                                                pp->full_name, this_orig_irq,
 722                                                irq);
 723
 724                         }
 725
 726                         if (pp->irq_trans) {
 727                                 ip = pp;
 728                                 break;
 729                         }
 730                 }
 731                 dp = pp;
 732                 pp = pp->parent;
 733         }
 734         if (!ip)
 735                 return orig_irq;
 736
 737         irq = ip->irq_trans->irq_build(op->node, irq,
 738                                        ip->irq_trans->data);
 739         if (of_irq_verbose)
 740                 printk("%s: Apply IRQ trans [%s] %x --> %x\n",
 741                        op->node->full_name, ip->full_name, orig_irq, irq);
 742
 743 out:
 744         nid = of_node_to_nid(dp);
 745         if (nid != -1) {
 746                 cpumask_t numa_mask = node_to_cpumask(nid);
 747
 748                 irq_set_affinity(irq, numa_mask);
 749         }
 750
 751         return irq;
 752 }
 753
 754 static struct of_device * __init scan_one_device(struct device_node *dp,
 755                                                  struct device *parent)
 756 {
 757         struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
 758         const unsigned int *irq;
 759         struct dev_archdata *sd;
 760         int len, i;
 761
 762         if (!op)
 763                 return NULL;
 764
 765         sd = &op->dev.archdata;
 766         sd->prom_node = dp;
 767         sd->op = op;
 768
 769         op->node = dp;
 770
 771         op->clock_freq = of_getintprop_default(dp, "clock-frequency",
 772                                                (25*1000*1000));
 773         op->portid = of_getintprop_default(dp, "upa-portid", -1);
 774         if (op->portid == -1)
 775                 op->portid = of_getintprop_default(dp, "portid", -1);
 776
 777         irq = of_get_property(dp, "interrupts", &len);
 778         if (irq) {
 779                 memcpy(op->irqs, irq, len);
 780                 op->num_irqs = len / 4;
 781         } else {
 782                 op->num_irqs = 0;
 783         }
 784
 785         /* Prevent overrunning the op->irqs[] array.  */
 786         if (op->num_irqs > PROMINTR_MAX) {
 787                 printk(KERN_WARNING "%s: Too many irqs (%d), "
 788                        "limiting to %d.\n",
 789                        dp->full_name, op->num_irqs, PROMINTR_MAX);
 790                 op->num_irqs = PROMINTR_MAX;
 791         }
 792
 793         build_device_resources(op, parent);
 794         for (i = 0; i < op->num_irqs; i++)
 795                 op->irqs[i] = build_one_device_irq(op, parent, op->irqs[i]);
 796
 797         op->dev.parent = parent;
 798         op->dev.bus = &of_platform_bus_type;
 799         if (!parent)
 800                 strcpy(op->dev.bus_id, "root");
 801         else
 802                 sprintf(op->dev.bus_id, "%08x", dp->node);
 803
 804         if (of_device_register(op)) {
 805                 printk("%s: Could not register of device.\n",
 806                        dp->full_name);
 807                 kfree(op);
 808                 op = NULL;
 809         }
 810
 811         return op;
 812 }
 813
 814 static void __init scan_tree(struct device_node *dp, struct device *parent)
 815 {
 816         while (dp) {
 817                 struct of_device *op = scan_one_device(dp, parent);
 818
 819                 if (op)
 820                         scan_tree(dp->child, &op->dev);
 821
 822                 dp = dp->sibling;
 823         }
 824 }
 825
 826 static void __init scan_of_devices(void)
 827 {
 828         struct device_node *root = of_find_node_by_path("/");
 829         struct of_device *parent;
 830
 831         parent = scan_one_device(root, NULL);
 832         if (!parent)
 833                 return;
 834
 835         scan_tree(root->child, &parent->dev);
 836 }
 837
 838 static int __init of_bus_driver_init(void)
 839 {
 840         int err;
 841
 842         err = of_bus_type_init(&of_platform_bus_type, "of");
 843 #ifdef CONFIG_PCI
 844         if (!err)
 845                 err = of_bus_type_init(&isa_bus_type, "isa");
 846         if (!err)
 847                 err = of_bus_type_init(&ebus_bus_type, "ebus");
 848 #endif
 849 #ifdef CONFIG_SBUS
 850         if (!err)
 851                 err = of_bus_type_init(&sbus_bus_type, "sbus");
 852 #endif
 853
 854         if (!err)
 855                 scan_of_devices();
 856
 857         return err;
 858 }
 859
 860 postcore_initcall(of_bus_driver_init);
 861
 862 static int __init of_debug(char *str)
 863 {
 864         int val = 0;
 865
 866         get_option(&str, &val);
 867         if (val & 1)
 868                 of_resource_verbose = 1;
 869         if (val & 2)
 870                 of_irq_verbose = 1;
 871         return 1;
 872 }
 873
 874 __setup("of_debug=", of_debug);