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/export.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 #include <asm/spitfire.h>       /* for tlb_type */
  13
  14 #include "of_device_common.h"
  15
  16 void __iomem *of_ioremap(struct resource *res, unsigned long offset, unsigned long size, char *name)
  17 {
  18         unsigned long ret = res->start + offset;
  19         struct resource *r;
  20
  21         if (res->flags & IORESOURCE_MEM)
  22                 r = request_mem_region(ret, size, name);
  23         else
  24                 r = request_region(ret, size, name);
  25         if (!r)
  26                 ret = 0;
  27
  28         return (void __iomem *) ret;
  29 }
  30 EXPORT_SYMBOL(of_ioremap);
  31
  32 void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
  33 {
  34         if (res->flags & IORESOURCE_MEM)
  35                 release_mem_region((unsigned long) base, size);
  36         else
  37                 release_region((unsigned long) base, size);
  38 }
  39 EXPORT_SYMBOL(of_iounmap);
  40
  41 /*
  42  * PCI bus specific translator
  43  */
  44
  45 static int of_bus_pci_match(struct device_node *np)
  46 {
  47         if (!strcmp(np->name, "pci")) {
  48                 const char *model = of_get_property(np, "model", NULL);
  49
  50                 if (model && !strcmp(model, "SUNW,simba"))
  51                         return 0;
  52
  53                 /* Do not do PCI specific frobbing if the
  54                  * PCI bridge lacks a ranges property.  We
  55                  * want to pass it through up to the next
  56                  * parent as-is, not with the PCI translate
  57                  * method which chops off the top address cell.
  58                  */
  59                 if (!of_find_property(np, "ranges", NULL))
  60                         return 0;
  61
  62                 return 1;
  63         }
  64
  65         return 0;
  66 }
  67
  68 static int of_bus_simba_match(struct device_node *np)
  69 {
  70         const char *model = of_get_property(np, "model", NULL);
  71
  72         if (model && !strcmp(model, "SUNW,simba"))
  73                 return 1;
  74
  75         /* Treat PCI busses lacking ranges property just like
  76          * simba.
  77          */
  78         if (!strcmp(np->name, "pci")) {
  79                 if (!of_find_property(np, "ranges", NULL))
  80                         return 1;
  81         }
  82
  83         return 0;
  84 }
  85
  86 static int of_bus_simba_map(u32 *addr, const u32 *range,
  87                             int na, int ns, int pna)
  88 {
  89         return 0;
  90 }
  91
  92 static void of_bus_pci_count_cells(struct device_node *np,
  93                                    int *addrc, int *sizec)
  94 {
  95         if (addrc)
  96                 *addrc = 3;
  97         if (sizec)
  98                 *sizec = 2;
  99 }
 100
 101 static int of_bus_pci_map(u32 *addr, const u32 *range,
 102                           int na, int ns, int pna)
 103 {
 104         u32 result[OF_MAX_ADDR_CELLS];
 105         int i;
 106
 107         /* Check address type match */
 108         if (!((addr[0] ^ range[0]) & 0x03000000))
 109                 goto type_match;
 110
 111         /* Special exception, we can map a 64-bit address into
 112          * a 32-bit range.
 113          */
 114         if ((addr[0] & 0x03000000) == 0x03000000 &&
 115             (range[0] & 0x03000000) == 0x02000000)
 116                 goto type_match;
 117
 118         return -EINVAL;
 119
 120 type_match:
 121         if (of_out_of_range(addr + 1, range + 1, range + na + pna,
 122                             na - 1, ns))
 123                 return -EINVAL;
 124
 125         /* Start with the parent range base.  */
 126         memcpy(result, range + na, pna * 4);
 127
 128         /* Add in the child address offset, skipping high cell.  */
 129         for (i = 0; i < na - 1; i++)
 130                 result[pna - 1 - i] +=
 131                         (addr[na - 1 - i] -
 132                          range[na - 1 - i]);
 133
 134         memcpy(addr, result, pna * 4);
 135
 136         return 0;
 137 }
 138
 139 static unsigned long of_bus_pci_get_flags(const u32 *addr, unsigned long flags)
 140 {
 141         u32 w = addr[0];
 142
 143         /* For PCI, we override whatever child busses may have used.  */
 144         flags = 0;
 145         switch((w >> 24) & 0x03) {
 146         case 0x01:
 147                 flags |= IORESOURCE_IO;
 148                 break;
 149
 150         case 0x02: /* 32 bits */
 151         case 0x03: /* 64 bits */
 152                 flags |= IORESOURCE_MEM;
 153                 break;
 154         }
 155         if (w & 0x40000000)
 156                 flags |= IORESOURCE_PREFETCH;
 157         return flags;
 158 }
 159
 160 /*
 161  * FHC/Central bus specific translator.
 162  *
 163  * This is just needed to hard-code the address and size cell
 164  * counts.  'fhc' and 'central' nodes lack the #address-cells and
 165  * #size-cells properties, and if you walk to the root on such
 166  * Enterprise boxes all you'll get is a #size-cells of 2 which is
 167  * not what we want to use.
 168  */
 169 static int of_bus_fhc_match(struct device_node *np)
 170 {
 171         return !strcmp(np->name, "fhc") ||
 172                 !strcmp(np->name, "central");
 173 }
 174
 175 #define of_bus_fhc_count_cells of_bus_sbus_count_cells
 176
 177 /*
 178  * Array of bus specific translators
 179  */
 180
 181 static struct of_bus of_busses[] = {
 182         /* PCI */
 183         {
 184                 .name = "pci",
 185                 .addr_prop_name = "assigned-addresses",
 186                 .match = of_bus_pci_match,
 187                 .count_cells = of_bus_pci_count_cells,
 188                 .map = of_bus_pci_map,
 189                 .get_flags = of_bus_pci_get_flags,
 190         },
 191         /* SIMBA */
 192         {
 193                 .name = "simba",
 194                 .addr_prop_name = "assigned-addresses",
 195                 .match = of_bus_simba_match,
 196                 .count_cells = of_bus_pci_count_cells,
 197                 .map = of_bus_simba_map,
 198                 .get_flags = of_bus_pci_get_flags,
 199         },
 200         /* SBUS */
 201         {
 202                 .name = "sbus",
 203                 .addr_prop_name = "reg",
 204                 .match = of_bus_sbus_match,
 205                 .count_cells = of_bus_sbus_count_cells,
 206                 .map = of_bus_default_map,
 207                 .get_flags = of_bus_default_get_flags,
 208         },
 209         /* FHC */
 210         {
 211                 .name = "fhc",
 212                 .addr_prop_name = "reg",
 213                 .match = of_bus_fhc_match,
 214                 .count_cells = of_bus_fhc_count_cells,
 215                 .map = of_bus_default_map,
 216                 .get_flags = of_bus_default_get_flags,
 217         },
 218         /* Default */
 219         {
 220                 .name = "default",
 221                 .addr_prop_name = "reg",
 222                 .match = NULL,
 223                 .count_cells = of_bus_default_count_cells,
 224                 .map = of_bus_default_map,
 225                 .get_flags = of_bus_default_get_flags,
 226         },
 227 };
 228
 229 static struct of_bus *of_match_bus(struct device_node *np)
 230 {
 231         int i;
 232
 233         for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
 234                 if (!of_busses[i].match || of_busses[i].match(np))
 235                         return &of_busses[i];
 236         BUG();
 237         return NULL;
 238 }
 239
 240 static int __init build_one_resource(struct device_node *parent,
 241                                      struct of_bus *bus,
 242                                      struct of_bus *pbus,
 243                                      u32 *addr,
 244                                      int na, int ns, int pna)
 245 {
 246         const u32 *ranges;
 247         int rone, rlen;
 248
 249         ranges = of_get_property(parent, "ranges", &rlen);
 250         if (ranges == NULL || rlen == 0) {
 251                 u32 result[OF_MAX_ADDR_CELLS];
 252                 int i;
 253
 254                 memset(result, 0, pna * 4);
 255                 for (i = 0; i < na; i++)
 256                         result[pna - 1 - i] =
 257                                 addr[na - 1 - i];
 258
 259                 memcpy(addr, result, pna * 4);
 260                 return 0;
 261         }
 262
 263         /* Now walk through the ranges */
 264         rlen /= 4;
 265         rone = na + pna + ns;
 266         for (; rlen >= rone; rlen -= rone, ranges += rone) {
 267                 if (!bus->map(addr, ranges, na, ns, pna))
 268                         return 0;
 269         }
 270
 271         /* When we miss an I/O space match on PCI, just pass it up
 272          * to the next PCI bridge and/or controller.
 273          */
 274         if (!strcmp(bus->name, "pci") &&
 275             (addr[0] & 0x03000000) == 0x01000000)
 276                 return 0;
 277
 278         return 1;
 279 }
 280
 281 static int __init use_1to1_mapping(struct device_node *pp)
 282 {
 283         /* If we have a ranges property in the parent, use it.  */
 284         if (of_find_property(pp, "ranges", NULL) != NULL)
 285                 return 0;
 286
 287         /* If the parent is the dma node of an ISA bus, pass
 288          * the translation up to the root.
 289          *
 290          * Some SBUS devices use intermediate nodes to express
 291          * hierarchy within the device itself.  These aren't
 292          * real bus nodes, and don't have a 'ranges' property.
 293          * But, we should still pass the translation work up
 294          * to the SBUS itself.
 295          */
 296         if (!strcmp(pp->name, "dma") ||
 297             !strcmp(pp->name, "espdma") ||
 298             !strcmp(pp->name, "ledma") ||
 299             !strcmp(pp->name, "lebuffer"))
 300                 return 0;
 301
 302         /* Similarly for all PCI bridges, if we get this far
 303          * it lacks a ranges property, and this will include
 304          * cases like Simba.
 305          */
 306         if (!strcmp(pp->name, "pci"))
 307                 return 0;
 308
 309         return 1;
 310 }
 311
 312 static int of_resource_verbose;
 313
 314 static void __init build_device_resources(struct platform_device *op,
 315                                           struct device *parent)
 316 {
 317         struct platform_device *p_op;
 318         struct of_bus *bus;
 319         int na, ns;
 320         int index, num_reg;
 321         const void *preg;
 322
 323         if (!parent)
 324                 return;
 325
 326         p_op = to_platform_device(parent);
 327         bus = of_match_bus(p_op->dev.of_node);
 328         bus->count_cells(op->dev.of_node, &na, &ns);
 329
 330         preg = of_get_property(op->dev.of_node, bus->addr_prop_name, &num_reg);
 331         if (!preg || num_reg == 0)
 332                 return;
 333
 334         /* Convert to num-cells.  */
 335         num_reg /= 4;
 336
 337         /* Convert to num-entries.  */
 338         num_reg /= na + ns;
 339
 340         /* Prevent overrunning the op->resources[] array.  */
 341         if (num_reg > PROMREG_MAX) {
 342                 printk(KERN_WARNING "%s: Too many regs (%d), "
 343                        "limiting to %d.\n",
 344                        op->dev.of_node->full_name, num_reg, PROMREG_MAX);
 345                 num_reg = PROMREG_MAX;
 346         }
 347
 348         op->resource = op->archdata.resource;
 349         op->num_resources = num_reg;
 350         for (index = 0; index < num_reg; index++) {
 351                 struct resource *r = &op->resource[index];
 352                 u32 addr[OF_MAX_ADDR_CELLS];
 353                 const u32 *reg = (preg + (index * ((na + ns) * 4)));
 354                 struct device_node *dp = op->dev.of_node;
 355                 struct device_node *pp = p_op->dev.of_node;
 356                 struct of_bus *pbus, *dbus;
 357                 u64 size, result = OF_BAD_ADDR;
 358                 unsigned long flags;
 359                 int dna, dns;
 360                 int pna, pns;
 361
 362                 size = of_read_addr(reg + na, ns);
 363                 memcpy(addr, reg, na * 4);
 364
 365                 flags = bus->get_flags(addr, 0);
 366
 367                 if (use_1to1_mapping(pp)) {
 368                         result = of_read_addr(addr, na);
 369                         goto build_res;
 370                 }
 371
 372                 dna = na;
 373                 dns = ns;
 374                 dbus = bus;
 375
 376                 while (1) {
 377                         dp = pp;
 378                         pp = dp->parent;
 379                         if (!pp) {
 380                                 result = of_read_addr(addr, dna);
 381                                 break;
 382                         }
 383
 384                         pbus = of_match_bus(pp);
 385                         pbus->count_cells(dp, &pna, &pns);
 386
 387                         if (build_one_resource(dp, dbus, pbus, addr,
 388                                                dna, dns, pna))
 389                                 break;
 390
 391                         flags = pbus->get_flags(addr, flags);
 392
 393                         dna = pna;
 394                         dns = pns;
 395                         dbus = pbus;
 396                 }
 397
 398         build_res:
 399                 memset(r, 0, sizeof(*r));
 400
 401                 if (of_resource_verbose)
 402                         printk("%s reg[%d] -> %llx\n",
 403                                op->dev.of_node->full_name, index,
 404                                result);
 405
 406                 if (result != OF_BAD_ADDR) {
 407                         if (tlb_type == hypervisor)
 408                                 result &= 0x0fffffffffffffffUL;
 409
 410                         r->start = result;
 411                         r->end = result + size - 1;
 412                         r->flags = flags;
 413                 }
 414                 r->name = op->dev.of_node->name;
 415         }
 416 }
 417
 418 static struct device_node * __init
 419 apply_interrupt_map(struct device_node *dp, struct device_node *pp,
 420                     const u32 *imap, int imlen, const u32 *imask,
 421                     unsigned int *irq_p)
 422 {
 423         struct device_node *cp;
 424         unsigned int irq = *irq_p;
 425         struct of_bus *bus;
 426         phandle handle;
 427         const u32 *reg;
 428         int na, num_reg, i;
 429
 430         bus = of_match_bus(pp);
 431         bus->count_cells(dp, &na, NULL);
 432
 433         reg = of_get_property(dp, "reg", &num_reg);
 434         if (!reg || !num_reg)
 435                 return NULL;
 436
 437         imlen /= ((na + 3) * 4);
 438         handle = 0;
 439         for (i = 0; i < imlen; i++) {
 440                 int j;
 441
 442                 for (j = 0; j < na; j++) {
 443                         if ((reg[j] & imask[j]) != imap[j])
 444                                 goto next;
 445                 }
 446                 if (imap[na] == irq) {
 447                         handle = imap[na + 1];
 448                         irq = imap[na + 2];
 449                         break;
 450                 }
 451
 452         next:
 453                 imap += (na + 3);
 454         }
 455         if (i == imlen) {
 456                 /* Psycho and Sabre PCI controllers can have 'interrupt-map'
 457                  * properties that do not include the on-board device
 458                  * interrupts.  Instead, the device's 'interrupts' property
 459                  * is already a fully specified INO value.
 460                  *
 461                  * Handle this by deciding that, if we didn't get a
 462                  * match in the parent's 'interrupt-map', and the
 463                  * parent is an IRQ translator, then use the parent as
 464                  * our IRQ controller.
 465                  */
 466                 if (pp->irq_trans)
 467                         return pp;
 468
 469                 return NULL;
 470         }
 471
 472         *irq_p = irq;
 473         cp = of_find_node_by_phandle(handle);
 474
 475         return cp;
 476 }
 477
 478 static unsigned int __init pci_irq_swizzle(struct device_node *dp,
 479                                            struct device_node *pp,
 480                                            unsigned int irq)
 481 {
 482         const struct linux_prom_pci_registers *regs;
 483         unsigned int bus, devfn, slot, ret;
 484
 485         if (irq < 1 || irq > 4)
 486                 return irq;
 487
 488         regs = of_get_property(dp, "reg", NULL);
 489         if (!regs)
 490                 return irq;
 491
 492         bus = (regs->phys_hi >> 16) & 0xff;
 493         devfn = (regs->phys_hi >> 8) & 0xff;
 494         slot = (devfn >> 3) & 0x1f;
 495
 496         if (pp->irq_trans) {
 497                 /* Derived from Table 8-3, U2P User's Manual.  This branch
 498                  * is handling a PCI controller that lacks a proper set of
 499                  * interrupt-map and interrupt-map-mask properties.  The
 500                  * Ultra-E450 is one example.
 501                  *
 502                  * The bit layout is BSSLL, where:
 503                  * B: 0 on bus A, 1 on bus B
 504                  * D: 2-bit slot number, derived from PCI device number as
 505                  *    (dev - 1) for bus A, or (dev - 2) for bus B
 506                  * L: 2-bit line number
 507                  */
 508                 if (bus & 0x80) {
 509                         /* PBM-A */
 510                         bus  = 0x00;
 511                         slot = (slot - 1) << 2;
 512                 } else {
 513                         /* PBM-B */
 514                         bus  = 0x10;
 515                         slot = (slot - 2) << 2;
 516                 }
 517                 irq -= 1;
 518
 519                 ret = (bus | slot | irq);
 520         } else {
 521                 /* Going through a PCI-PCI bridge that lacks a set of
 522                  * interrupt-map and interrupt-map-mask properties.
 523                  */
 524                 ret = ((irq - 1 + (slot & 3)) & 3) + 1;
 525         }
 526
 527         return ret;
 528 }
 529
 530 static int of_irq_verbose;
 531
 532 static unsigned int __init build_one_device_irq(struct platform_device *op,
 533                                                 struct device *parent,
 534                                                 unsigned int irq)
 535 {
 536         struct device_node *dp = op->dev.of_node;
 537         struct device_node *pp, *ip;
 538         unsigned int orig_irq = irq;
 539         int nid;
 540
 541         if (irq == 0xffffffff)
 542                 return irq;
 543
 544         if (dp->irq_trans) {
 545                 irq = dp->irq_trans->irq_build(dp, irq,
 546                                                dp->irq_trans->data);
 547
 548                 if (of_irq_verbose)
 549                         printk("%s: direct translate %x --> %x\n",
 550                                dp->full_name, orig_irq, irq);
 551
 552                 goto out;
 553         }
 554
 555         /* Something more complicated.  Walk up to the root, applying
 556          * interrupt-map or bus specific translations, until we hit
 557          * an IRQ translator.
 558          *
 559          * If we hit a bus type or situation we cannot handle, we
 560          * stop and assume that the original IRQ number was in a
 561          * format which has special meaning to it's immediate parent.
 562          */
 563         pp = dp->parent;
 564         ip = NULL;
 565         while (pp) {
 566                 const void *imap, *imsk;
 567                 int imlen;
 568
 569                 imap = of_get_property(pp, "interrupt-map", &imlen);
 570                 imsk = of_get_property(pp, "interrupt-map-mask", NULL);
 571                 if (imap && imsk) {
 572                         struct device_node *iret;
 573                         int this_orig_irq = irq;
 574
 575                         iret = apply_interrupt_map(dp, pp,
 576                                                    imap, imlen, imsk,
 577                                                    &irq);
 578
 579                         if (of_irq_verbose)
 580                                 printk("%s: Apply [%s:%x] imap --> [%s:%x]\n",
 581                                        op->dev.of_node->full_name,
 582                                        pp->full_name, this_orig_irq,
 583                                        (iret ? iret->full_name : "NULL"), irq);
 584
 585                         if (!iret)
 586                                 break;
 587
 588                         if (iret->irq_trans) {
 589                                 ip = iret;
 590                                 break;
 591                         }
 592                 } else {
 593                         if (!strcmp(pp->name, "pci")) {
 594                                 unsigned int this_orig_irq = irq;
 595
 596                                 irq = pci_irq_swizzle(dp, pp, irq);
 597                                 if (of_irq_verbose)
 598                                         printk("%s: PCI swizzle [%s] "
 599                                                "%x --> %x\n",
 600                                                op->dev.of_node->full_name,
 601                                                pp->full_name, this_orig_irq,
 602                                                irq);
 603
 604                         }
 605
 606                         if (pp->irq_trans) {
 607                                 ip = pp;
 608                                 break;
 609                         }
 610                 }
 611                 dp = pp;
 612                 pp = pp->parent;
 613         }
 614         if (!ip)
 615                 return orig_irq;
 616
 617         irq = ip->irq_trans->irq_build(op->dev.of_node, irq,
 618                                        ip->irq_trans->data);
 619         if (of_irq_verbose)
 620                 printk("%s: Apply IRQ trans [%s] %x --> %x\n",
 621                       op->dev.of_node->full_name, ip->full_name, orig_irq, irq);
 622
 623 out:
 624         nid = of_node_to_nid(dp);
 625         if (nid != -1) {
 626                 cpumask_t numa_mask;
 627
 628                 cpumask_copy(&numa_mask, cpumask_of_node(nid));
 629                 irq_set_affinity(irq, &numa_mask);
 630         }
 631
 632         return irq;
 633 }
 634
 635 static struct platform_device * __init scan_one_device(struct device_node *dp,
 636                                                  struct device *parent)
 637 {
 638         struct platform_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
 639         const unsigned int *irq;
 640         struct dev_archdata *sd;
 641         int len, i;
 642
 643         if (!op)
 644                 return NULL;
 645
 646         sd = &op->dev.archdata;
 647         sd->op = op;
 648
 649         op->dev.of_node = dp;
 650
 651         irq = of_get_property(dp, "interrupts", &len);
 652         if (irq) {
 653                 op->archdata.num_irqs = len / 4;
 654
 655                 /* Prevent overrunning the op->irqs[] array.  */
 656                 if (op->archdata.num_irqs > PROMINTR_MAX) {
 657                         printk(KERN_WARNING "%s: Too many irqs (%d), "
 658                                "limiting to %d.\n",
 659                                dp->full_name, op->archdata.num_irqs, PROMINTR_MAX);
 660                         op->archdata.num_irqs = PROMINTR_MAX;
 661                 }
 662                 memcpy(op->archdata.irqs, irq, op->archdata.num_irqs * 4);
 663         } else {
 664                 op->archdata.num_irqs = 0;
 665         }
 666
 667         build_device_resources(op, parent);
 668         for (i = 0; i < op->archdata.num_irqs; i++)
 669                 op->archdata.irqs[i] = build_one_device_irq(op, parent, op->archdata.irqs[i]);
 670
 671         op->dev.parent = parent;
 672         op->dev.bus = &platform_bus_type;
 673         if (!parent)
 674                 dev_set_name(&op->dev, "root");
 675         else
 676                 dev_set_name(&op->dev, "%08x", dp->phandle);
 677
 678         if (of_device_register(op)) {
 679                 printk("%s: Could not register of device.\n",
 680                        dp->full_name);
 681                 kfree(op);
 682                 op = NULL;
 683         }
 684
 685         return op;
 686 }
 687
 688 static void __init scan_tree(struct device_node *dp, struct device *parent)
 689 {
 690         while (dp) {
 691                 struct platform_device *op = scan_one_device(dp, parent);
 692
 693                 if (op)
 694                         scan_tree(dp->child, &op->dev);
 695
 696                 dp = dp->sibling;
 697         }
 698 }
 699
 700 static int __init scan_of_devices(void)
 701 {
 702         struct device_node *root = of_find_node_by_path("/");
 703         struct platform_device *parent;
 704
 705         parent = scan_one_device(root, NULL);
 706         if (!parent)
 707                 return 0;
 708
 709         scan_tree(root->child, &parent->dev);
 710         return 0;
 711 }
 712 postcore_initcall(scan_of_devices);
 713
 714 static int __init of_debug(char *str)
 715 {
 716         int val = 0;
 717
 718         get_option(&str, &val);
 719         if (val & 1)
 720                 of_resource_verbose = 1;
 721         if (val & 2)
 722                 of_irq_verbose = 1;
 723         return 1;
 724 }
 725
 726 __setup("of_debug=", of_debug);