arch/sparc/kernel/of_device_64.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/string.h>
   3 #include <linux/kernel.h>
   4 #include <linux/of.h>
   5 #include <linux/init.h>
   6 #include <linux/export.h>
   7 #include <linux/mod_devicetable.h>
   8 #include <linux/slab.h>
   9 #include <linux/errno.h>
  10 #include <linux/irq.h>
  11 #include <linux/of_device.h>
  12 #include <linux/of_platform.h>
  13 #include <asm/spitfire.h>
  14
  15 #include "of_device_common.h"
  16
  17 void __iomem *of_ioremap(struct resource *res, unsigned long offset, unsigned long size, char *name)
  18 {
  19         unsigned long ret = res->start + offset;
  20         struct resource *r;
  21
  22         if (res->flags & IORESOURCE_MEM)
  23                 r = request_mem_region(ret, size, name);
  24         else
  25                 r = request_region(ret, size, name);
  26         if (!r)
  27                 ret = 0;
  28
  29         return (void __iomem *) ret;
  30 }
  31 EXPORT_SYMBOL(of_ioremap);
  32
  33 void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
  34 {
  35         if (res->flags & IORESOURCE_MEM)
  36                 release_mem_region((unsigned long) base, size);
  37         else
  38                 release_region((unsigned long) base, size);
  39 }
  40 EXPORT_SYMBOL(of_iounmap);
  41
  42 /*
  43  * PCI bus specific translator
  44  */
  45
  46 static int of_bus_pci_match(struct device_node *np)
  47 {
  48         if (!strcmp(np->name, "pci")) {
  49                 const char *model = of_get_property(np, "model", NULL);
  50
  51                 if (model && !strcmp(model, "SUNW,simba"))
  52                         return 0;
  53
  54                 /* Do not do PCI specific frobbing if the
  55                  * PCI bridge lacks a ranges property.  We
  56                  * want to pass it through up to the next
  57                  * parent as-is, not with the PCI translate
  58                  * method which chops off the top address cell.
  59                  */
  60                 if (!of_find_property(np, "ranges", NULL))
  61                         return 0;
  62
  63                 return 1;
  64         }
  65
  66         return 0;
  67 }
  68
  69 static int of_bus_simba_match(struct device_node *np)
  70 {
  71         const char *model = of_get_property(np, "model", NULL);
  72
  73         if (model && !strcmp(model, "SUNW,simba"))
  74                 return 1;
  75
  76         /* Treat PCI busses lacking ranges property just like
  77          * simba.
  78          */
  79         if (!strcmp(np->name, "pci")) {
  80                 if (!of_find_property(np, "ranges", NULL))
  81                         return 1;
  82         }
  83
  84         return 0;
  85 }
  86
  87 static int of_bus_simba_map(u32 *addr, const u32 *range,
  88                             int na, int ns, int pna)
  89 {
  90         return 0;
  91 }
  92
  93 static void of_bus_pci_count_cells(struct device_node *np,
  94                                    int *addrc, int *sizec)
  95 {
  96         if (addrc)
  97                 *addrc = 3;
  98         if (sizec)
  99                 *sizec = 2;
 100 }
 101
 102 static int of_bus_pci_map(u32 *addr, const u32 *range,
 103                           int na, int ns, int pna)
 104 {
 105         u32 result[OF_MAX_ADDR_CELLS];
 106         int i;
 107
 108         /* Check address type match */
 109         if (!((addr[0] ^ range[0]) & 0x03000000))
 110                 goto type_match;
 111
 112         /* Special exception, we can map a 64-bit address into
 113          * a 32-bit range.
 114          */
 115         if ((addr[0] & 0x03000000) == 0x03000000 &&
 116             (range[0] & 0x03000000) == 0x02000000)
 117                 goto type_match;
 118
 119         return -EINVAL;
 120
 121 type_match:
 122         if (of_out_of_range(addr + 1, range + 1, range + na + pna,
 123                             na - 1, ns))
 124                 return -EINVAL;
 125
 126         /* Start with the parent range base.  */
 127         memcpy(result, range + na, pna * 4);
 128
 129         /* Add in the child address offset, skipping high cell.  */
 130         for (i = 0; i < na - 1; i++)
 131                 result[pna - 1 - i] +=
 132                         (addr[na - 1 - i] -
 133                          range[na - 1 - i]);
 134
 135         memcpy(addr, result, pna * 4);
 136
 137         return 0;
 138 }
 139
 140 static unsigned long of_bus_pci_get_flags(const u32 *addr, unsigned long flags)
 141 {
 142         u32 w = addr[0];
 143
 144         /* For PCI, we override whatever child busses may have used.  */
 145         flags = 0;
 146         switch((w >> 24) & 0x03) {
 147         case 0x01:
 148                 flags |= IORESOURCE_IO;
 149                 break;
 150
 151         case 0x02: /* 32 bits */
 152         case 0x03: /* 64 bits */
 153                 flags |= IORESOURCE_MEM;
 154                 break;
 155         }
 156         if (w & 0x40000000)
 157                 flags |= IORESOURCE_PREFETCH;
 158         return flags;
 159 }
 160
 161 /*
 162  * FHC/Central bus specific translator.
 163  *
 164  * This is just needed to hard-code the address and size cell
 165  * counts.  'fhc' and 'central' nodes lack the #address-cells and
 166  * #size-cells properties, and if you walk to the root on such
 167  * Enterprise boxes all you'll get is a #size-cells of 2 which is
 168  * not what we want to use.
 169  */
 170 static int of_bus_fhc_match(struct device_node *np)
 171 {
 172         return !strcmp(np->name, "fhc") ||
 173                 !strcmp(np->name, "central");
 174 }
 175
 176 #define of_bus_fhc_count_cells of_bus_sbus_count_cells
 177
 178 /*
 179  * Array of bus specific translators
 180  */
 181
 182 static struct of_bus of_busses[] = {
 183         /* PCI */
 184         {
 185                 .name = "pci",
 186                 .addr_prop_name = "assigned-addresses",
 187                 .match = of_bus_pci_match,
 188                 .count_cells = of_bus_pci_count_cells,
 189                 .map = of_bus_pci_map,
 190                 .get_flags = of_bus_pci_get_flags,
 191         },
 192         /* SIMBA */
 193         {
 194                 .name = "simba",
 195                 .addr_prop_name = "assigned-addresses",
 196                 .match = of_bus_simba_match,
 197                 .count_cells = of_bus_pci_count_cells,
 198                 .map = of_bus_simba_map,
 199                 .get_flags = of_bus_pci_get_flags,
 200         },
 201         /* SBUS */
 202         {
 203                 .name = "sbus",
 204                 .addr_prop_name = "reg",
 205                 .match = of_bus_sbus_match,
 206                 .count_cells = of_bus_sbus_count_cells,
 207                 .map = of_bus_default_map,
 208                 .get_flags = of_bus_default_get_flags,
 209         },
 210         /* FHC */
 211         {
 212                 .name = "fhc",
 213                 .addr_prop_name = "reg",
 214                 .match = of_bus_fhc_match,
 215                 .count_cells = of_bus_fhc_count_cells,
 216                 .map = of_bus_default_map,
 217                 .get_flags = of_bus_default_get_flags,
 218         },
 219         /* Default */
 220         {
 221                 .name = "default",
 222                 .addr_prop_name = "reg",
 223                 .match = NULL,
 224                 .count_cells = of_bus_default_count_cells,
 225                 .map = of_bus_default_map,
 226                 .get_flags = of_bus_default_get_flags,
 227         },
 228 };
 229
 230 static struct of_bus *of_match_bus(struct device_node *np)
 231 {
 232         int i;
 233
 234         for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
 235                 if (!of_busses[i].match || of_busses[i].match(np))
 236                         return &of_busses[i];
 237         BUG();
 238         return NULL;
 239 }
 240
 241 static int __init build_one_resource(struct device_node *parent,
 242                                      struct of_bus *bus,
 243                                      struct of_bus *pbus,
 244                                      u32 *addr,
 245                                      int na, int ns, int pna)
 246 {
 247         const u32 *ranges;
 248         int rone, rlen;
 249
 250         ranges = of_get_property(parent, "ranges", &rlen);
 251         if (ranges == NULL || rlen == 0) {
 252                 u32 result[OF_MAX_ADDR_CELLS];
 253                 int i;
 254
 255                 memset(result, 0, pna * 4);
 256                 for (i = 0; i < na; i++)
 257                         result[pna - 1 - i] =
 258                                 addr[na - 1 - i];
 259
 260                 memcpy(addr, result, pna * 4);
 261                 return 0;
 262         }
 263
 264         /* Now walk through the ranges */
 265         rlen /= 4;
 266         rone = na + pna + ns;
 267         for (; rlen >= rone; rlen -= rone, ranges += rone) {
 268                 if (!bus->map(addr, ranges, na, ns, pna))
 269                         return 0;
 270         }
 271
 272         /* When we miss an I/O space match on PCI, just pass it up
 273          * to the next PCI bridge and/or controller.
 274          */
 275         if (!strcmp(bus->name, "pci") &&
 276             (addr[0] & 0x03000000) == 0x01000000)
 277                 return 0;
 278
 279         return 1;
 280 }
 281
 282 static int __init use_1to1_mapping(struct device_node *pp)
 283 {
 284         /* If we have a ranges property in the parent, use it.  */
 285         if (of_find_property(pp, "ranges", NULL) != NULL)
 286                 return 0;
 287
 288         /* If the parent is the dma node of an ISA bus, pass
 289          * the translation up to the root.
 290          *
 291          * Some SBUS devices use intermediate nodes to express
 292          * hierarchy within the device itself.  These aren't
 293          * real bus nodes, and don't have a 'ranges' property.
 294          * But, we should still pass the translation work up
 295          * to the SBUS itself.
 296          */
 297         if (!strcmp(pp->name, "dma") ||
 298             !strcmp(pp->name, "espdma") ||
 299             !strcmp(pp->name, "ledma") ||
 300             !strcmp(pp->name, "lebuffer"))
 301                 return 0;
 302
 303         /* Similarly for all PCI bridges, if we get this far
 304          * it lacks a ranges property, and this will include
 305          * cases like Simba.
 306          */
 307         if (!strcmp(pp->name, "pci"))
 308                 return 0;
 309
 310         return 1;
 311 }
 312
 313 static int of_resource_verbose;
 314
 315 static void __init build_device_resources(struct platform_device *op,
 316                                           struct device *parent)
 317 {
 318         struct platform_device *p_op;
 319         struct of_bus *bus;
 320         int na, ns;
 321         int index, num_reg;
 322         const void *preg;
 323
 324         if (!parent)
 325                 return;
 326
 327         p_op = to_platform_device(parent);
 328         bus = of_match_bus(p_op->dev.of_node);
 329         bus->count_cells(op->dev.of_node, &na, &ns);
 330
 331         preg = of_get_property(op->dev.of_node, bus->addr_prop_name, &num_reg);
 332         if (!preg || num_reg == 0)
 333                 return;
 334
 335         /* Convert to num-cells.  */
 336         num_reg /= 4;
 337
 338         /* Convert to num-entries.  */
 339         num_reg /= na + ns;
 340
 341         /* Prevent overrunning the op->resources[] array.  */
 342         if (num_reg > PROMREG_MAX) {
 343                 printk(KERN_WARNING "%s: Too many regs (%d), "
 344                        "limiting to %d.\n",
 345                        op->dev.of_node->full_name, num_reg, PROMREG_MAX);
 346                 num_reg = PROMREG_MAX;
 347         }
 348
 349         op->resource = op->archdata.resource;
 350         op->num_resources = num_reg;
 351         for (index = 0; index < num_reg; index++) {
 352                 struct resource *r = &op->resource[index];
 353                 u32 addr[OF_MAX_ADDR_CELLS];
 354                 const u32 *reg = (preg + (index * ((na + ns) * 4)));
 355                 struct device_node *dp = op->dev.of_node;
 356                 struct device_node *pp = p_op->dev.of_node;
 357                 struct of_bus *pbus, *dbus;
 358                 u64 size, result = OF_BAD_ADDR;
 359                 unsigned long flags;
 360                 int dna, dns;
 361                 int pna, pns;
 362
 363                 size = of_read_addr(reg + na, ns);
 364                 memcpy(addr, reg, na * 4);
 365
 366                 flags = bus->get_flags(addr, 0);
 367
 368                 if (use_1to1_mapping(pp)) {
 369                         result = of_read_addr(addr, na);
 370                         goto build_res;
 371                 }
 372
 373                 dna = na;
 374                 dns = ns;
 375                 dbus = bus;
 376
 377                 while (1) {
 378                         dp = pp;
 379                         pp = dp->parent;
 380                         if (!pp) {
 381                                 result = of_read_addr(addr, dna);
 382                                 break;
 383                         }
 384
 385                         pbus = of_match_bus(pp);
 386                         pbus->count_cells(dp, &pna, &pns);
 387
 388                         if (build_one_resource(dp, dbus, pbus, addr,
 389                                                dna, dns, pna))
 390                                 break;
 391
 392                         flags = pbus->get_flags(addr, flags);
 393
 394                         dna = pna;
 395                         dns = pns;
 396                         dbus = pbus;
 397                 }
 398
 399         build_res:
 400                 memset(r, 0, sizeof(*r));
 401
 402                 if (of_resource_verbose)
 403                         printk("%s reg[%d] -> %llx\n",
 404                                op->dev.of_node->full_name, index,
 405                                result);
 406
 407                 if (result != OF_BAD_ADDR) {
 408                         if (tlb_type == hypervisor)
 409                                 result &= 0x0fffffffffffffffUL;
 410
 411                         r->start = result;
 412                         r->end = result + size - 1;
 413                         r->flags = flags;
 414                 }
 415                 r->name = op->dev.of_node->name;
 416         }
 417 }
 418
 419 static struct device_node * __init
 420 apply_interrupt_map(struct device_node *dp, struct device_node *pp,
 421                     const u32 *imap, int imlen, const u32 *imask,
 422                     unsigned int *irq_p)
 423 {
 424         struct device_node *cp;
 425         unsigned int irq = *irq_p;
 426         struct of_bus *bus;
 427         phandle handle;
 428         const u32 *reg;
 429         int na, num_reg, i;
 430
 431         bus = of_match_bus(pp);
 432         bus->count_cells(dp, &na, NULL);
 433
 434         reg = of_get_property(dp, "reg", &num_reg);
 435         if (!reg || !num_reg)
 436                 return NULL;
 437
 438         imlen /= ((na + 3) * 4);
 439         handle = 0;
 440         for (i = 0; i < imlen; i++) {
 441                 int j;
 442
 443                 for (j = 0; j < na; j++) {
 444                         if ((reg[j] & imask[j]) != imap[j])
 445                                 goto next;
 446                 }
 447                 if (imap[na] == irq) {
 448                         handle = imap[na + 1];
 449                         irq = imap[na + 2];
 450                         break;
 451                 }
 452
 453         next:
 454                 imap += (na + 3);
 455         }
 456         if (i == imlen) {
 457                 /* Psycho and Sabre PCI controllers can have 'interrupt-map'
 458                  * properties that do not include the on-board device
 459                  * interrupts.  Instead, the device's 'interrupts' property
 460                  * is already a fully specified INO value.
 461                  *
 462                  * Handle this by deciding that, if we didn't get a
 463                  * match in the parent's 'interrupt-map', and the
 464                  * parent is an IRQ translator, then use the parent as
 465                  * our IRQ controller.
 466                  */
 467                 if (pp->irq_trans)
 468                         return pp;
 469
 470                 return NULL;
 471         }
 472
 473         *irq_p = irq;
 474         cp = of_find_node_by_phandle(handle);
 475
 476         return cp;
 477 }
 478
 479 static unsigned int __init pci_irq_swizzle(struct device_node *dp,
 480                                            struct device_node *pp,
 481                                            unsigned int irq)
 482 {
 483         const struct linux_prom_pci_registers *regs;
 484         unsigned int bus, devfn, slot, ret;
 485
 486         if (irq < 1 || irq > 4)
 487                 return irq;
 488
 489         regs = of_get_property(dp, "reg", NULL);
 490         if (!regs)
 491                 return irq;
 492
 493         bus = (regs->phys_hi >> 16) & 0xff;
 494         devfn = (regs->phys_hi >> 8) & 0xff;
 495         slot = (devfn >> 3) & 0x1f;
 496
 497         if (pp->irq_trans) {
 498                 /* Derived from Table 8-3, U2P User's Manual.  This branch
 499                  * is handling a PCI controller that lacks a proper set of
 500                  * interrupt-map and interrupt-map-mask properties.  The
 501                  * Ultra-E450 is one example.
 502                  *
 503                  * The bit layout is BSSLL, where:
 504                  * B: 0 on bus A, 1 on bus B
 505                  * D: 2-bit slot number, derived from PCI device number as
 506                  *    (dev - 1) for bus A, or (dev - 2) for bus B
 507                  * L: 2-bit line number
 508                  */
 509                 if (bus & 0x80) {
 510                         /* PBM-A */
 511                         bus  = 0x00;
 512                         slot = (slot - 1) << 2;
 513                 } else {
 514                         /* PBM-B */
 515                         bus  = 0x10;
 516                         slot = (slot - 2) << 2;
 517                 }
 518                 irq -= 1;
 519
 520                 ret = (bus | slot | irq);
 521         } else {
 522                 /* Going through a PCI-PCI bridge that lacks a set of
 523                  * interrupt-map and interrupt-map-mask properties.
 524                  */
 525                 ret = ((irq - 1 + (slot & 3)) & 3) + 1;
 526         }
 527
 528         return ret;
 529 }
 530
 531 static int of_irq_verbose;
 532
 533 static unsigned int __init build_one_device_irq(struct platform_device *op,
 534                                                 struct device *parent,
 535                                                 unsigned int irq)
 536 {
 537         struct device_node *dp = op->dev.of_node;
 538         struct device_node *pp, *ip;
 539         unsigned int orig_irq = irq;
 540         int nid;
 541
 542         if (irq == 0xffffffff)
 543                 return irq;
 544
 545         if (dp->irq_trans) {
 546                 irq = dp->irq_trans->irq_build(dp, irq,
 547                                                dp->irq_trans->data);
 548
 549                 if (of_irq_verbose)
 550                         printk("%s: direct translate %x --> %x\n",
 551                                dp->full_name, orig_irq, irq);
 552
 553                 goto out;
 554         }
 555
 556         /* Something more complicated.  Walk up to the root, applying
 557          * interrupt-map or bus specific translations, until we hit
 558          * an IRQ translator.
 559          *
 560          * If we hit a bus type or situation we cannot handle, we
 561          * stop and assume that the original IRQ number was in a
 562          * format which has special meaning to it's immediate parent.
 563          */
 564         pp = dp->parent;
 565         ip = NULL;
 566         while (pp) {
 567                 const void *imap, *imsk;
 568                 int imlen;
 569
 570                 imap = of_get_property(pp, "interrupt-map", &imlen);
 571                 imsk = of_get_property(pp, "interrupt-map-mask", NULL);
 572                 if (imap && imsk) {
 573                         struct device_node *iret;
 574                         int this_orig_irq = irq;
 575
 576                         iret = apply_interrupt_map(dp, pp,
 577                                                    imap, imlen, imsk,
 578                                                    &irq);
 579
 580                         if (of_irq_verbose)
 581                                 printk("%s: Apply [%s:%x] imap --> [%s:%x]\n",
 582                                        op->dev.of_node->full_name,
 583                                        pp->full_name, this_orig_irq,
 584                                        of_node_full_name(iret), irq);
 585
 586                         if (!iret)
 587                                 break;
 588
 589                         if (iret->irq_trans) {
 590                                 ip = iret;
 591                                 break;
 592                         }
 593                 } else {
 594                         if (!strcmp(pp->name, "pci")) {
 595                                 unsigned int this_orig_irq = irq;
 596
 597                                 irq = pci_irq_swizzle(dp, pp, irq);
 598                                 if (of_irq_verbose)
 599                                         printk("%s: PCI swizzle [%s] "
 600                                                "%x --> %x\n",
 601                                                op->dev.of_node->full_name,
 602                                                pp->full_name, this_orig_irq,
 603                                                irq);
 604
 605                         }
 606
 607                         if (pp->irq_trans) {
 608                                 ip = pp;
 609                                 break;
 610                         }
 611                 }
 612                 dp = pp;
 613                 pp = pp->parent;
 614         }
 615         if (!ip)
 616                 return orig_irq;
 617
 618         irq = ip->irq_trans->irq_build(op->dev.of_node, irq,
 619                                        ip->irq_trans->data);
 620         if (of_irq_verbose)
 621                 printk("%s: Apply IRQ trans [%s] %x --> %x\n",
 622                       op->dev.of_node->full_name, ip->full_name, orig_irq, irq);
 623
 624 out:
 625         nid = of_node_to_nid(dp);
 626         if (nid != -1) {
 627                 cpumask_t numa_mask;
 628
 629                 cpumask_copy(&numa_mask, cpumask_of_node(nid));
 630                 irq_set_affinity(irq, &numa_mask);
 631         }
 632
 633         return irq;
 634 }
 635
 636 static struct platform_device * __init scan_one_device(struct device_node *dp,
 637                                                  struct device *parent)
 638 {
 639         struct platform_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
 640         const unsigned int *irq;
 641         struct dev_archdata *sd;
 642         int len, i;
 643
 644         if (!op)
 645                 return NULL;
 646
 647         sd = &op->dev.archdata;
 648         sd->op = op;
 649
 650         op->dev.of_node = dp;
 651
 652         irq = of_get_property(dp, "interrupts", &len);
 653         if (irq) {
 654                 op->archdata.num_irqs = len / 4;
 655
 656                 /* Prevent overrunning the op->irqs[] array.  */
 657                 if (op->archdata.num_irqs > PROMINTR_MAX) {
 658                         printk(KERN_WARNING "%s: Too many irqs (%d), "
 659                                "limiting to %d.\n",
 660                                dp->full_name, op->archdata.num_irqs, PROMINTR_MAX);
 661                         op->archdata.num_irqs = PROMINTR_MAX;
 662                 }
 663                 memcpy(op->archdata.irqs, irq, op->archdata.num_irqs * 4);
 664         } else {
 665                 op->archdata.num_irqs = 0;
 666         }
 667
 668         build_device_resources(op, parent);
 669         for (i = 0; i < op->archdata.num_irqs; i++)
 670                 op->archdata.irqs[i] = build_one_device_irq(op, parent, op->archdata.irqs[i]);
 671
 672         op->dev.parent = parent;
 673         op->dev.bus = &platform_bus_type;
 674         if (!parent)
 675                 dev_set_name(&op->dev, "root");
 676         else
 677                 dev_set_name(&op->dev, "%08x", dp->phandle);
 678
 679         if (of_device_register(op)) {
 680                 printk("%s: Could not register of device.\n",
 681                        dp->full_name);
 682                 kfree(op);
 683                 op = NULL;
 684         }
 685
 686         return op;
 687 }
 688
 689 static void __init scan_tree(struct device_node *dp, struct device *parent)
 690 {
 691         while (dp) {
 692                 struct platform_device *op = scan_one_device(dp, parent);
 693
 694                 if (op)
 695                         scan_tree(dp->child, &op->dev);
 696
 697                 dp = dp->sibling;
 698         }
 699 }
 700
 701 static int __init scan_of_devices(void)
 702 {
 703         struct device_node *root = of_find_node_by_path("/");
 704         struct platform_device *parent;
 705
 706         parent = scan_one_device(root, NULL);
 707         if (!parent)
 708                 return 0;
 709
 710         scan_tree(root->child, &parent->dev);
 711         return 0;
 712 }
 713 postcore_initcall(scan_of_devices);
 714
 715 static int __init of_debug(char *str)
 716 {
 717         int val = 0;
 718
 719         get_option(&str, &val);
 720         if (val & 1)
 721                 of_resource_verbose = 1;
 722         if (val & 2)
 723                 of_irq_verbose = 1;
 724         return 1;
 725 }
 726
 727 __setup("of_debug=", of_debug);