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