arch/sparc/kernel/of_device_64.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 #include "of_device_common.h"
  14
  15 void __iomem *of_ioremap(struct resource *res, unsigned long offset, unsigned long size, char *name)
  16 {
  17         unsigned long ret = res->start + offset;
  18         struct resource *r;
  19
  20         if (res->flags & IORESOURCE_MEM)
  21                 r = request_mem_region(ret, size, name);
  22         else
  23                 r = request_region(ret, size, name);
  24         if (!r)
  25                 ret = 0;
  26
  27         return (void __iomem *) ret;
  28 }
  29 EXPORT_SYMBOL(of_ioremap);
  30
  31 void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
  32 {
  33         if (res->flags & IORESOURCE_MEM)
  34                 release_mem_region((unsigned long) base, size);
  35         else
  36                 release_region((unsigned long) base, size);
  37 }
  38 EXPORT_SYMBOL(of_iounmap);
  39
  40 /*
  41  * PCI bus specific translator
  42  */
  43
  44 static int of_bus_pci_match(struct device_node *np)
  45 {
  46         if (!strcmp(np->name, "pci")) {
  47                 const char *model = of_get_property(np, "model", NULL);
  48
  49                 if (model && !strcmp(model, "SUNW,simba"))
  50                         return 0;
  51
  52                 /* Do not do PCI specific frobbing if the
  53                  * PCI bridge lacks a ranges property.  We
  54                  * want to pass it through up to the next
  55                  * parent as-is, not with the PCI translate
  56                  * method which chops off the top address cell.
  57                  */
  58                 if (!of_find_property(np, "ranges", NULL))
  59                         return 0;
  60
  61                 return 1;
  62         }
  63
  64         return 0;
  65 }
  66
  67 static int of_bus_simba_match(struct device_node *np)
  68 {
  69         const char *model = of_get_property(np, "model", NULL);
  70
  71         if (model && !strcmp(model, "SUNW,simba"))
  72                 return 1;
  73
  74         /* Treat PCI busses lacking ranges property just like
  75          * simba.
  76          */
  77         if (!strcmp(np->name, "pci")) {
  78                 if (!of_find_property(np, "ranges", NULL))
  79                         return 1;
  80         }
  81
  82         return 0;
  83 }
  84
  85 static int of_bus_simba_map(u32 *addr, const u32 *range,
  86                             int na, int ns, int pna)
  87 {
  88         return 0;
  89 }
  90
  91 static void of_bus_pci_count_cells(struct device_node *np,
  92                                    int *addrc, int *sizec)
  93 {
  94         if (addrc)
  95                 *addrc = 3;
  96         if (sizec)
  97                 *sizec = 2;
  98 }
  99
 100 static int of_bus_pci_map(u32 *addr, const u32 *range,
 101                           int na, int ns, int pna)
 102 {
 103         u32 result[OF_MAX_ADDR_CELLS];
 104         int i;
 105
 106         /* Check address type match */
 107         if (!((addr[0] ^ range[0]) & 0x03000000))
 108                 goto type_match;
 109
 110         /* Special exception, we can map a 64-bit address into
 111          * a 32-bit range.
 112          */
 113         if ((addr[0] & 0x03000000) == 0x03000000 &&
 114             (range[0] & 0x03000000) == 0x02000000)
 115                 goto type_match;
 116
 117         return -EINVAL;
 118
 119 type_match:
 120         if (of_out_of_range(addr + 1, range + 1, range + na + pna,
 121                             na - 1, ns))
 122                 return -EINVAL;
 123
 124         /* Start with the parent range base.  */
 125         memcpy(result, range + na, pna * 4);
 126
 127         /* Add in the child address offset, skipping high cell.  */
 128         for (i = 0; i < na - 1; i++)
 129                 result[pna - 1 - i] +=
 130                         (addr[na - 1 - i] -
 131                          range[na - 1 - i]);
 132
 133         memcpy(addr, result, pna * 4);
 134
 135         return 0;
 136 }
 137
 138 static unsigned long of_bus_pci_get_flags(const u32 *addr, unsigned long flags)
 139 {
 140         u32 w = addr[0];
 141
 142         /* For PCI, we override whatever child busses may have used.  */
 143         flags = 0;
 144         switch((w >> 24) & 0x03) {
 145         case 0x01:
 146                 flags |= IORESOURCE_IO;
 147                 break;
 148
 149         case 0x02: /* 32 bits */
 150         case 0x03: /* 64 bits */
 151                 flags |= IORESOURCE_MEM;
 152                 break;
 153         }
 154         if (w & 0x40000000)
 155                 flags |= IORESOURCE_PREFETCH;
 156         return flags;
 157 }
 158
 159 /*
 160  * FHC/Central bus specific translator.
 161  *
 162  * This is just needed to hard-code the address and size cell
 163  * counts.  'fhc' and 'central' nodes lack the #address-cells and
 164  * #size-cells properties, and if you walk to the root on such
 165  * Enterprise boxes all you'll get is a #size-cells of 2 which is
 166  * not what we want to use.
 167  */
 168 static int of_bus_fhc_match(struct device_node *np)
 169 {
 170         return !strcmp(np->name, "fhc") ||
 171                 !strcmp(np->name, "central");
 172 }
 173
 174 #define of_bus_fhc_count_cells of_bus_sbus_count_cells
 175
 176 /*
 177  * Array of bus specific translators
 178  */
 179
 180 static struct of_bus of_busses[] = {
 181         /* PCI */
 182         {
 183                 .name = "pci",
 184                 .addr_prop_name = "assigned-addresses",
 185                 .match = of_bus_pci_match,
 186                 .count_cells = of_bus_pci_count_cells,
 187                 .map = of_bus_pci_map,
 188                 .get_flags = of_bus_pci_get_flags,
 189         },
 190         /* SIMBA */
 191         {
 192                 .name = "simba",
 193                 .addr_prop_name = "assigned-addresses",
 194                 .match = of_bus_simba_match,
 195                 .count_cells = of_bus_pci_count_cells,
 196                 .map = of_bus_simba_map,
 197                 .get_flags = of_bus_pci_get_flags,
 198         },
 199         /* SBUS */
 200         {
 201                 .name = "sbus",
 202                 .addr_prop_name = "reg",
 203                 .match = of_bus_sbus_match,
 204                 .count_cells = of_bus_sbus_count_cells,
 205                 .map = of_bus_default_map,
 206                 .get_flags = of_bus_default_get_flags,
 207         },
 208         /* FHC */
 209         {
 210                 .name = "fhc",
 211                 .addr_prop_name = "reg",
 212                 .match = of_bus_fhc_match,
 213                 .count_cells = of_bus_fhc_count_cells,
 214                 .map = of_bus_default_map,
 215                 .get_flags = of_bus_default_get_flags,
 216         },
 217         /* Default */
 218         {
 219                 .name = "default",
 220                 .addr_prop_name = "reg",
 221                 .match = NULL,
 222                 .count_cells = of_bus_default_count_cells,
 223                 .map = of_bus_default_map,
 224                 .get_flags = of_bus_default_get_flags,
 225         },
 226 };
 227
 228 static struct of_bus *of_match_bus(struct device_node *np)
 229 {
 230         int i;
 231
 232         for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
 233                 if (!of_busses[i].match || of_busses[i].match(np))
 234                         return &of_busses[i];
 235         BUG();
 236         return NULL;
 237 }
 238
 239 static int __init build_one_resource(struct device_node *parent,
 240                                      struct of_bus *bus,
 241                                      struct of_bus *pbus,
 242                                      u32 *addr,
 243                                      int na, int ns, int pna)
 244 {
 245         const u32 *ranges;
 246         int rone, rlen;
 247
 248         ranges = of_get_property(parent, "ranges", &rlen);
 249         if (ranges == NULL || rlen == 0) {
 250                 u32 result[OF_MAX_ADDR_CELLS];
 251                 int i;
 252
 253                 memset(result, 0, pna * 4);
 254                 for (i = 0; i < na; i++)
 255                         result[pna - 1 - i] =
 256                                 addr[na - 1 - i];
 257
 258                 memcpy(addr, result, pna * 4);
 259                 return 0;
 260         }
 261
 262         /* Now walk through the ranges */
 263         rlen /= 4;
 264         rone = na + pna + ns;
 265         for (; rlen >= rone; rlen -= rone, ranges += rone) {
 266                 if (!bus->map(addr, ranges, na, ns, pna))
 267                         return 0;
 268         }
 269
 270         /* When we miss an I/O space match on PCI, just pass it up
 271          * to the next PCI bridge and/or controller.
 272          */
 273         if (!strcmp(bus->name, "pci") &&
 274             (addr[0] & 0x03000000) == 0x01000000)
 275                 return 0;
 276
 277         return 1;
 278 }
 279
 280 static int __init use_1to1_mapping(struct device_node *pp)
 281 {
 282         /* If we have a ranges property in the parent, use it.  */
 283         if (of_find_property(pp, "ranges", NULL) != NULL)
 284                 return 0;
 285
 286         /* If the parent is the dma node of an ISA bus, pass
 287          * the translation up to the root.
 288          *
 289          * Some SBUS devices use intermediate nodes to express
 290          * hierarchy within the device itself.  These aren't
 291          * real bus nodes, and don't have a 'ranges' property.
 292          * But, we should still pass the translation work up
 293          * to the SBUS itself.
 294          */
 295         if (!strcmp(pp->name, "dma") ||
 296             !strcmp(pp->name, "espdma") ||
 297             !strcmp(pp->name, "ledma") ||
 298             !strcmp(pp->name, "lebuffer"))
 299                 return 0;
 300
 301         /* Similarly for all PCI bridges, if we get this far
 302          * it lacks a ranges property, and this will include
 303          * cases like Simba.
 304          */
 305         if (!strcmp(pp->name, "pci"))
 306                 return 0;
 307
 308         return 1;
 309 }
 310
 311 static int of_resource_verbose;
 312
 313 static void __init build_device_resources(struct of_device *op,
 314                                           struct device *parent)
 315 {
 316         struct of_device *p_op;
 317         struct of_bus *bus;
 318         int na, ns;
 319         int index, num_reg;
 320         const void *preg;
 321
 322         if (!parent)
 323                 return;
 324
 325         p_op = to_of_device(parent);
 326         bus = of_match_bus(p_op->node);
 327         bus->count_cells(op->node, &na, &ns);
 328
 329         preg = of_get_property(op->node, bus->addr_prop_name, &num_reg);
 330         if (!preg || num_reg == 0)
 331                 return;
 332
 333         /* Convert to num-cells.  */
 334         num_reg /= 4;
 335
 336         /* Convert to num-entries.  */
 337         num_reg /= na + ns;
 338
 339         /* Prevent overrunning the op->resources[] array.  */
 340         if (num_reg > PROMREG_MAX) {
 341                 printk(KERN_WARNING "%s: Too many regs (%d), "
 342                        "limiting to %d.\n",
 343                        op->node->full_name, num_reg, PROMREG_MAX);
 344                 num_reg = PROMREG_MAX;
 345         }
 346
 347         for (index = 0; index < num_reg; index++) {
 348                 struct resource *r = &op->resource[index];
 349                 u32 addr[OF_MAX_ADDR_CELLS];
 350                 const u32 *reg = (preg + (index * ((na + ns) * 4)));
 351                 struct device_node *dp = op->node;
 352                 struct device_node *pp = p_op->node;
 353                 struct of_bus *pbus, *dbus;
 354                 u64 size, result = OF_BAD_ADDR;
 355                 unsigned long flags;
 356                 int dna, dns;
 357                 int pna, pns;
 358
 359                 size = of_read_addr(reg + na, ns);
 360                 memcpy(addr, reg, na * 4);
 361
 362                 flags = bus->get_flags(addr, 0);
 363
 364                 if (use_1to1_mapping(pp)) {
 365                         result = of_read_addr(addr, na);
 366                         goto build_res;
 367                 }
 368
 369                 dna = na;
 370                 dns = ns;
 371                 dbus = bus;
 372
 373                 while (1) {
 374                         dp = pp;
 375                         pp = dp->parent;
 376                         if (!pp) {
 377                                 result = of_read_addr(addr, dna);
 378                                 break;
 379                         }
 380
 381                         pbus = of_match_bus(pp);
 382                         pbus->count_cells(dp, &pna, &pns);
 383
 384                         if (build_one_resource(dp, dbus, pbus, addr,
 385                                                dna, dns, pna))
 386                                 break;
 387
 388                         flags = pbus->get_flags(addr, flags);
 389
 390                         dna = pna;
 391                         dns = pns;
 392                         dbus = pbus;
 393                 }
 394
 395         build_res:
 396                 memset(r, 0, sizeof(*r));
 397
 398                 if (of_resource_verbose)
 399                         printk("%s reg[%d] -> %llx\n",
 400                                op->node->full_name, index,
 401                                result);
 402
 403                 if (result != OF_BAD_ADDR) {
 404                         if (tlb_type == hypervisor)
 405                                 result &= 0x0fffffffffffffffUL;
 406
 407                         r->start = result;
 408                         r->end = result + size - 1;
 409                         r->flags = flags;
 410                 }
 411                 r->name = op->node->name;
 412         }
 413 }
 414
 415 static struct device_node * __init
 416 apply_interrupt_map(struct device_node *dp, struct device_node *pp,
 417                     const u32 *imap, int imlen, const u32 *imask,
 418                     unsigned int *irq_p)
 419 {
 420         struct device_node *cp;
 421         unsigned int irq = *irq_p;
 422         struct of_bus *bus;
 423         phandle handle;
 424         const u32 *reg;
 425         int na, num_reg, i;
 426
 427         bus = of_match_bus(pp);
 428         bus->count_cells(dp, &na, NULL);
 429
 430         reg = of_get_property(dp, "reg", &num_reg);
 431         if (!reg || !num_reg)
 432                 return NULL;
 433
 434         imlen /= ((na + 3) * 4);
 435         handle = 0;
 436         for (i = 0; i < imlen; i++) {
 437                 int j;
 438
 439                 for (j = 0; j < na; j++) {
 440                         if ((reg[j] & imask[j]) != imap[j])
 441                                 goto next;
 442                 }
 443                 if (imap[na] == irq) {
 444                         handle = imap[na + 1];
 445                         irq = imap[na + 2];
 446                         break;
 447                 }
 448
 449         next:
 450                 imap += (na + 3);
 451         }
 452         if (i == imlen) {
 453                 /* Psycho and Sabre PCI controllers can have 'interrupt-map'
 454                  * properties that do not include the on-board device
 455                  * interrupts.  Instead, the device's 'interrupts' property
 456                  * is already a fully specified INO value.
 457                  *
 458                  * Handle this by deciding that, if we didn't get a
 459                  * match in the parent's 'interrupt-map', and the
 460                  * parent is an IRQ translater, then use the parent as
 461                  * our IRQ controller.
 462                  */
 463                 if (pp->irq_trans)
 464                         return pp;
 465
 466                 return NULL;
 467         }
 468
 469         *irq_p = irq;
 470         cp = of_find_node_by_phandle(handle);
 471
 472         return cp;
 473 }
 474
 475 static unsigned int __init pci_irq_swizzle(struct device_node *dp,
 476                                            struct device_node *pp,
 477                                            unsigned int irq)
 478 {
 479         const struct linux_prom_pci_registers *regs;
 480         unsigned int bus, devfn, slot, ret;
 481
 482         if (irq < 1 || irq > 4)
 483                 return irq;
 484
 485         regs = of_get_property(dp, "reg", NULL);
 486         if (!regs)
 487                 return irq;
 488
 489         bus = (regs->phys_hi >> 16) & 0xff;
 490         devfn = (regs->phys_hi >> 8) & 0xff;
 491         slot = (devfn >> 3) & 0x1f;
 492
 493         if (pp->irq_trans) {
 494                 /* Derived from Table 8-3, U2P User's Manual.  This branch
 495                  * is handling a PCI controller that lacks a proper set of
 496                  * interrupt-map and interrupt-map-mask properties.  The
 497                  * Ultra-E450 is one example.
 498                  *
 499                  * The bit layout is BSSLL, where:
 500                  * B: 0 on bus A, 1 on bus B
 501                  * D: 2-bit slot number, derived from PCI device number as
 502                  *    (dev - 1) for bus A, or (dev - 2) for bus B
 503                  * L: 2-bit line number
 504                  */
 505                 if (bus & 0x80) {
 506                         /* PBM-A */
 507                         bus  = 0x00;
 508                         slot = (slot - 1) << 2;
 509                 } else {
 510                         /* PBM-B */
 511                         bus  = 0x10;
 512                         slot = (slot - 2) << 2;
 513                 }
 514                 irq -= 1;
 515
 516                 ret = (bus | slot | irq);
 517         } else {
 518                 /* Going through a PCI-PCI bridge that lacks a set of
 519                  * interrupt-map and interrupt-map-mask properties.
 520                  */
 521                 ret = ((irq - 1 + (slot & 3)) & 3) + 1;
 522         }
 523
 524         return ret;
 525 }
 526
 527 static int of_irq_verbose;
 528
 529 static unsigned int __init build_one_device_irq(struct of_device *op,
 530                                                 struct device *parent,
 531                                                 unsigned int irq)
 532 {
 533         struct device_node *dp = op->node;
 534         struct device_node *pp, *ip;
 535         unsigned int orig_irq = irq;
 536         int nid;
 537
 538         if (irq == 0xffffffff)
 539                 return irq;
 540
 541         if (dp->irq_trans) {
 542                 irq = dp->irq_trans->irq_build(dp, irq,
 543                                                dp->irq_trans->data);
 544
 545                 if (of_irq_verbose)
 546                         printk("%s: direct translate %x --> %x\n",
 547                                dp->full_name, orig_irq, irq);
 548
 549                 goto out;
 550         }
 551
 552         /* Something more complicated.  Walk up to the root, applying
 553          * interrupt-map or bus specific translations, until we hit
 554          * an IRQ translator.
 555          *
 556          * If we hit a bus type or situation we cannot handle, we
 557          * stop and assume that the original IRQ number was in a
 558          * format which has special meaning to it's immediate parent.
 559          */
 560         pp = dp->parent;
 561         ip = NULL;
 562         while (pp) {
 563                 const void *imap, *imsk;
 564                 int imlen;
 565
 566                 imap = of_get_property(pp, "interrupt-map", &imlen);
 567                 imsk = of_get_property(pp, "interrupt-map-mask", NULL);
 568                 if (imap && imsk) {
 569                         struct device_node *iret;
 570                         int this_orig_irq = irq;
 571
 572                         iret = apply_interrupt_map(dp, pp,
 573                                                    imap, imlen, imsk,
 574                                                    &irq);
 575
 576                         if (of_irq_verbose)
 577                                 printk("%s: Apply [%s:%x] imap --> [%s:%x]\n",
 578                                        op->node->full_name,
 579                                        pp->full_name, this_orig_irq,
 580                                        (iret ? iret->full_name : "NULL"), irq);
 581
 582                         if (!iret)
 583                                 break;
 584
 585                         if (iret->irq_trans) {
 586                                 ip = iret;
 587                                 break;
 588                         }
 589                 } else {
 590                         if (!strcmp(pp->name, "pci")) {
 591                                 unsigned int this_orig_irq = irq;
 592
 593                                 irq = pci_irq_swizzle(dp, pp, irq);
 594                                 if (of_irq_verbose)
 595                                         printk("%s: PCI swizzle [%s] "
 596                                                "%x --> %x\n",
 597                                                op->node->full_name,
 598                                                pp->full_name, this_orig_irq,
 599                                                irq);
 600
 601                         }
 602
 603                         if (pp->irq_trans) {
 604                                 ip = pp;
 605                                 break;
 606                         }
 607                 }
 608                 dp = pp;
 609                 pp = pp->parent;
 610         }
 611         if (!ip)
 612                 return orig_irq;
 613
 614         irq = ip->irq_trans->irq_build(op->node, irq,
 615                                        ip->irq_trans->data);
 616         if (of_irq_verbose)
 617                 printk("%s: Apply IRQ trans [%s] %x --> %x\n",
 618                        op->node->full_name, ip->full_name, orig_irq, irq);
 619
 620 out:
 621         nid = of_node_to_nid(dp);
 622         if (nid != -1) {
 623                 cpumask_t numa_mask = *cpumask_of_node(nid);
 624
 625                 irq_set_affinity(irq, &numa_mask);
 626         }
 627
 628         return irq;
 629 }
 630
 631 static struct of_device * __init scan_one_device(struct device_node *dp,
 632                                                  struct device *parent)
 633 {
 634         struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
 635         const unsigned int *irq;
 636         struct dev_archdata *sd;
 637         int len, i;
 638
 639         if (!op)
 640                 return NULL;
 641
 642         sd = &op->dev.archdata;
 643         sd->prom_node = dp;
 644         sd->op = op;
 645
 646         op->node = dp;
 647
 648         op->clock_freq = of_getintprop_default(dp, "clock-frequency",
 649                                                (25*1000*1000));
 650         op->portid = of_getintprop_default(dp, "upa-portid", -1);
 651         if (op->portid == -1)
 652                 op->portid = of_getintprop_default(dp, "portid", -1);
 653
 654         irq = of_get_property(dp, "interrupts", &len);
 655         if (irq) {
 656                 op->num_irqs = len / 4;
 657
 658                 /* Prevent overrunning the op->irqs[] array.  */
 659                 if (op->num_irqs > PROMINTR_MAX) {
 660                         printk(KERN_WARNING "%s: Too many irqs (%d), "
 661                                "limiting to %d.\n",
 662                                dp->full_name, op->num_irqs, PROMINTR_MAX);
 663                         op->num_irqs = PROMINTR_MAX;
 664                 }
 665                 memcpy(op->irqs, irq, op->num_irqs * 4);
 666         } else {
 667                 op->num_irqs = 0;
 668         }
 669
 670         build_device_resources(op, parent);
 671         for (i = 0; i < op->num_irqs; i++)
 672                 op->irqs[i] = build_one_device_irq(op, parent, op->irqs[i]);
 673
 674         op->dev.parent = parent;
 675         op->dev.bus = &of_platform_bus_type;
 676         if (!parent)
 677                 dev_set_name(&op->dev, "root");
 678         else
 679                 dev_set_name(&op->dev, "%08x", dp->phandle);
 680
 681         if (of_device_register(op)) {
 682                 printk("%s: Could not register of device.\n",
 683                        dp->full_name);
 684                 kfree(op);
 685                 op = NULL;
 686         }
 687
 688         return op;
 689 }
 690
 691 static void __init scan_tree(struct device_node *dp, struct device *parent)
 692 {
 693         while (dp) {
 694                 struct of_device *op = scan_one_device(dp, parent);
 695
 696                 if (op)
 697                         scan_tree(dp->child, &op->dev);
 698
 699                 dp = dp->sibling;
 700         }
 701 }
 702
 703 static void __init scan_of_devices(void)
 704 {
 705         struct device_node *root = of_find_node_by_path("/");
 706         struct of_device *parent;
 707
 708         parent = scan_one_device(root, NULL);
 709         if (!parent)
 710                 return;
 711
 712         scan_tree(root->child, &parent->dev);
 713 }
 714
 715 static int __init of_bus_driver_init(void)
 716 {
 717         int err;
 718
 719         err = of_bus_type_init(&of_platform_bus_type, "of");
 720         if (!err)
 721                 scan_of_devices();
 722
 723         return err;
 724 }
 725
 726 postcore_initcall(of_bus_driver_init);
 727
 728 static int __init of_debug(char *str)
 729 {
 730         int val = 0;
 731
 732         get_option(&str, &val);
 733         if (val & 1)
 734                 of_resource_verbose = 1;
 735         if (val & 2)
 736                 of_irq_verbose = 1;
 737         return 1;
 738 }
 739
 740 __setup("of_debug=", of_debug);