arch/sparc/kernel/of_device_32.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 #include <asm/leon.h>
  13 #include <asm/leon_amba.h>
  14
  15 #include "of_device_common.h"
  16
  17 /*
  18  * PCI bus specific translator
  19  */
  20
  21 static int of_bus_pci_match(struct device_node *np)
  22 {
  23         if (!strcmp(np->type, "pci") || !strcmp(np->type, "pciex")) {
  24                 /* Do not do PCI specific frobbing if the
  25                  * PCI bridge lacks a ranges property.  We
  26                  * want to pass it through up to the next
  27                  * parent as-is, not with the PCI translate
  28                  * method which chops off the top address cell.
  29                  */
  30                 if (!of_find_property(np, "ranges", NULL))
  31                         return 0;
  32
  33                 return 1;
  34         }
  35
  36         return 0;
  37 }
  38
  39 static void of_bus_pci_count_cells(struct device_node *np,
  40                                    int *addrc, int *sizec)
  41 {
  42         if (addrc)
  43                 *addrc = 3;
  44         if (sizec)
  45                 *sizec = 2;
  46 }
  47
  48 static int of_bus_pci_map(u32 *addr, const u32 *range,
  49                           int na, int ns, int pna)
  50 {
  51         u32 result[OF_MAX_ADDR_CELLS];
  52         int i;
  53
  54         /* Check address type match */
  55         if ((addr[0] ^ range[0]) & 0x03000000)
  56                 return -EINVAL;
  57
  58         if (of_out_of_range(addr + 1, range + 1, range + na + pna,
  59                             na - 1, ns))
  60                 return -EINVAL;
  61
  62         /* Start with the parent range base.  */
  63         memcpy(result, range + na, pna * 4);
  64
  65         /* Add in the child address offset, skipping high cell.  */
  66         for (i = 0; i < na - 1; i++)
  67                 result[pna - 1 - i] +=
  68                         (addr[na - 1 - i] -
  69                          range[na - 1 - i]);
  70
  71         memcpy(addr, result, pna * 4);
  72
  73         return 0;
  74 }
  75
  76 static unsigned long of_bus_pci_get_flags(const u32 *addr, unsigned long flags)
  77 {
  78         u32 w = addr[0];
  79
  80         /* For PCI, we override whatever child busses may have used.  */
  81         flags = 0;
  82         switch((w >> 24) & 0x03) {
  83         case 0x01:
  84                 flags |= IORESOURCE_IO;
  85                 break;
  86
  87         case 0x02: /* 32 bits */
  88         case 0x03: /* 64 bits */
  89                 flags |= IORESOURCE_MEM;
  90                 break;
  91         }
  92         if (w & 0x40000000)
  93                 flags |= IORESOURCE_PREFETCH;
  94         return flags;
  95 }
  96
  97 static unsigned long of_bus_sbus_get_flags(const u32 *addr, unsigned long flags)
  98 {
  99         return IORESOURCE_MEM;
 100 }
 101
 102  /*
 103  * AMBAPP bus specific translator
 104  */
 105
 106 static int of_bus_ambapp_match(struct device_node *np)
 107 {
 108         return !strcmp(np->type, "ambapp");
 109 }
 110
 111 static void of_bus_ambapp_count_cells(struct device_node *child,
 112                                       int *addrc, int *sizec)
 113 {
 114         if (addrc)
 115                 *addrc = 1;
 116         if (sizec)
 117                 *sizec = 1;
 118 }
 119
 120 static int of_bus_ambapp_map(u32 *addr, const u32 *range,
 121                              int na, int ns, int pna)
 122 {
 123         return of_bus_default_map(addr, range, na, ns, pna);
 124 }
 125
 126 static unsigned long of_bus_ambapp_get_flags(const u32 *addr,
 127                                              unsigned long flags)
 128 {
 129         return IORESOURCE_MEM;
 130 }
 131
 132 /*
 133  * Array of bus specific translators
 134  */
 135
 136 static struct of_bus of_busses[] = {
 137         /* PCI */
 138         {
 139                 .name = "pci",
 140                 .addr_prop_name = "assigned-addresses",
 141                 .match = of_bus_pci_match,
 142                 .count_cells = of_bus_pci_count_cells,
 143                 .map = of_bus_pci_map,
 144                 .get_flags = of_bus_pci_get_flags,
 145         },
 146         /* SBUS */
 147         {
 148                 .name = "sbus",
 149                 .addr_prop_name = "reg",
 150                 .match = of_bus_sbus_match,
 151                 .count_cells = of_bus_sbus_count_cells,
 152                 .map = of_bus_default_map,
 153                 .get_flags = of_bus_sbus_get_flags,
 154         },
 155         /* AMBA */
 156         {
 157                 .name = "ambapp",
 158                 .addr_prop_name = "reg",
 159                 .match = of_bus_ambapp_match,
 160                 .count_cells = of_bus_ambapp_count_cells,
 161                 .map = of_bus_ambapp_map,
 162                 .get_flags = of_bus_ambapp_get_flags,
 163         },
 164         /* Default */
 165         {
 166                 .name = "default",
 167                 .addr_prop_name = "reg",
 168                 .match = NULL,
 169                 .count_cells = of_bus_default_count_cells,
 170                 .map = of_bus_default_map,
 171                 .get_flags = of_bus_default_get_flags,
 172         },
 173 };
 174
 175 static struct of_bus *of_match_bus(struct device_node *np)
 176 {
 177         int i;
 178
 179         for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
 180                 if (!of_busses[i].match || of_busses[i].match(np))
 181                         return &of_busses[i];
 182         BUG();
 183         return NULL;
 184 }
 185
 186 static int __init build_one_resource(struct device_node *parent,
 187                                      struct of_bus *bus,
 188                                      struct of_bus *pbus,
 189                                      u32 *addr,
 190                                      int na, int ns, int pna)
 191 {
 192         const u32 *ranges;
 193         unsigned int rlen;
 194         int rone;
 195
 196         ranges = of_get_property(parent, "ranges", &rlen);
 197         if (ranges == NULL || rlen == 0) {
 198                 u32 result[OF_MAX_ADDR_CELLS];
 199                 int i;
 200
 201                 memset(result, 0, pna * 4);
 202                 for (i = 0; i < na; i++)
 203                         result[pna - 1 - i] =
 204                                 addr[na - 1 - i];
 205
 206                 memcpy(addr, result, pna * 4);
 207                 return 0;
 208         }
 209
 210         /* Now walk through the ranges */
 211         rlen /= 4;
 212         rone = na + pna + ns;
 213         for (; rlen >= rone; rlen -= rone, ranges += rone) {
 214                 if (!bus->map(addr, ranges, na, ns, pna))
 215                         return 0;
 216         }
 217
 218         return 1;
 219 }
 220
 221 static int __init use_1to1_mapping(struct device_node *pp)
 222 {
 223         /* If we have a ranges property in the parent, use it.  */
 224         if (of_find_property(pp, "ranges", NULL) != NULL)
 225                 return 0;
 226
 227         /* Some SBUS devices use intermediate nodes to express
 228          * hierarchy within the device itself.  These aren't
 229          * real bus nodes, and don't have a 'ranges' property.
 230          * But, we should still pass the translation work up
 231          * to the SBUS itself.
 232          */
 233         if (!strcmp(pp->name, "dma") ||
 234             !strcmp(pp->name, "espdma") ||
 235             !strcmp(pp->name, "ledma") ||
 236             !strcmp(pp->name, "lebuffer"))
 237                 return 0;
 238
 239         return 1;
 240 }
 241
 242 static int of_resource_verbose;
 243
 244 static void __init build_device_resources(struct of_device *op,
 245                                           struct device *parent)
 246 {
 247         struct of_device *p_op;
 248         struct of_bus *bus;
 249         int na, ns;
 250         int index, num_reg;
 251         const void *preg;
 252
 253         if (!parent)
 254                 return;
 255
 256         p_op = to_of_device(parent);
 257         bus = of_match_bus(p_op->dev.of_node);
 258         bus->count_cells(op->dev.of_node, &na, &ns);
 259
 260         preg = of_get_property(op->dev.of_node, bus->addr_prop_name, &num_reg);
 261         if (!preg || num_reg == 0)
 262                 return;
 263
 264         /* Convert to num-cells.  */
 265         num_reg /= 4;
 266
 267         /* Conver to num-entries.  */
 268         num_reg /= na + ns;
 269
 270         for (index = 0; index < num_reg; index++) {
 271                 struct resource *r = &op->resource[index];
 272                 u32 addr[OF_MAX_ADDR_CELLS];
 273                 const u32 *reg = (preg + (index * ((na + ns) * 4)));
 274                 struct device_node *dp = op->dev.of_node;
 275                 struct device_node *pp = p_op->dev.of_node;
 276                 struct of_bus *pbus, *dbus;
 277                 u64 size, result = OF_BAD_ADDR;
 278                 unsigned long flags;
 279                 int dna, dns;
 280                 int pna, pns;
 281
 282                 size = of_read_addr(reg + na, ns);
 283
 284                 memcpy(addr, reg, na * 4);
 285
 286                 flags = bus->get_flags(reg, 0);
 287
 288                 if (use_1to1_mapping(pp)) {
 289                         result = of_read_addr(addr, na);
 290                         goto build_res;
 291                 }
 292
 293                 dna = na;
 294                 dns = ns;
 295                 dbus = bus;
 296
 297                 while (1) {
 298                         dp = pp;
 299                         pp = dp->parent;
 300                         if (!pp) {
 301                                 result = of_read_addr(addr, dna);
 302                                 break;
 303                         }
 304
 305                         pbus = of_match_bus(pp);
 306                         pbus->count_cells(dp, &pna, &pns);
 307
 308                         if (build_one_resource(dp, dbus, pbus, addr,
 309                                                dna, dns, pna))
 310                                 break;
 311
 312                         flags = pbus->get_flags(addr, flags);
 313
 314                         dna = pna;
 315                         dns = pns;
 316                         dbus = pbus;
 317                 }
 318
 319         build_res:
 320                 memset(r, 0, sizeof(*r));
 321
 322                 if (of_resource_verbose)
 323                         printk("%s reg[%d] -> %llx\n",
 324                                op->dev.of_node->full_name, index,
 325                                result);
 326
 327                 if (result != OF_BAD_ADDR) {
 328                         r->start = result & 0xffffffff;
 329                         r->end = result + size - 1;
 330                         r->flags = flags | ((result >> 32ULL) & 0xffUL);
 331                 }
 332                 r->name = op->dev.of_node->name;
 333         }
 334 }
 335
 336 static struct of_device * __init scan_one_device(struct device_node *dp,
 337                                                  struct device *parent)
 338 {
 339         struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
 340         const struct linux_prom_irqs *intr;
 341         struct dev_archdata *sd;
 342         int len, i;
 343
 344         if (!op)
 345                 return NULL;
 346
 347         sd = &op->dev.archdata;
 348         sd->op = op;
 349
 350         op->dev.of_node = dp;
 351
 352         op->clock_freq = of_getintprop_default(dp, "clock-frequency",
 353                                                (25*1000*1000));
 354         op->portid = of_getintprop_default(dp, "upa-portid", -1);
 355         if (op->portid == -1)
 356                 op->portid = of_getintprop_default(dp, "portid", -1);
 357
 358         intr = of_get_property(dp, "intr", &len);
 359         if (intr) {
 360                 op->num_irqs = len / sizeof(struct linux_prom_irqs);
 361                 for (i = 0; i < op->num_irqs; i++)
 362                         op->irqs[i] = intr[i].pri;
 363         } else {
 364                 const unsigned int *irq =
 365                         of_get_property(dp, "interrupts", &len);
 366
 367                 if (irq) {
 368                         op->num_irqs = len / sizeof(unsigned int);
 369                         for (i = 0; i < op->num_irqs; i++)
 370                                 op->irqs[i] = irq[i];
 371                 } else {
 372                         op->num_irqs = 0;
 373                 }
 374         }
 375         if (sparc_cpu_model == sun4d) {
 376                 static int pil_to_sbus[] = {
 377                         0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
 378                 };
 379                 struct device_node *io_unit, *sbi = dp->parent;
 380                 const struct linux_prom_registers *regs;
 381                 int board, slot;
 382
 383                 while (sbi) {
 384                         if (!strcmp(sbi->name, "sbi"))
 385                                 break;
 386
 387                         sbi = sbi->parent;
 388                 }
 389                 if (!sbi)
 390                         goto build_resources;
 391
 392                 regs = of_get_property(dp, "reg", NULL);
 393                 if (!regs)
 394                         goto build_resources;
 395
 396                 slot = regs->which_io;
 397
 398                 /* If SBI's parent is not io-unit or the io-unit lacks
 399                  * a "board#" property, something is very wrong.
 400                  */
 401                 if (!sbi->parent || strcmp(sbi->parent->name, "io-unit")) {
 402                         printk("%s: Error, parent is not io-unit.\n",
 403                                sbi->full_name);
 404                         goto build_resources;
 405                 }
 406                 io_unit = sbi->parent;
 407                 board = of_getintprop_default(io_unit, "board#", -1);
 408                 if (board == -1) {
 409                         printk("%s: Error, lacks board# property.\n",
 410                                io_unit->full_name);
 411                         goto build_resources;
 412                 }
 413
 414                 for (i = 0; i < op->num_irqs; i++) {
 415                         int this_irq = op->irqs[i];
 416                         int sbusl = pil_to_sbus[this_irq];
 417
 418                         if (sbusl)
 419                                 this_irq = (((board + 1) << 5) +
 420                                             (sbusl << 2) +
 421                                             slot);
 422
 423                         op->irqs[i] = this_irq;
 424                 }
 425         }
 426
 427 build_resources:
 428         build_device_resources(op, parent);
 429
 430         op->dev.parent = parent;
 431         op->dev.bus = &of_platform_bus_type;
 432         if (!parent)
 433                 dev_set_name(&op->dev, "root");
 434         else
 435                 dev_set_name(&op->dev, "%08x", dp->phandle);
 436
 437         if (of_device_register(op)) {
 438                 printk("%s: Could not register of device.\n",
 439                        dp->full_name);
 440                 kfree(op);
 441                 op = NULL;
 442         }
 443
 444         return op;
 445 }
 446
 447 static void __init scan_tree(struct device_node *dp, struct device *parent)
 448 {
 449         while (dp) {
 450                 struct of_device *op = scan_one_device(dp, parent);
 451
 452                 if (op)
 453                         scan_tree(dp->child, &op->dev);
 454
 455                 dp = dp->sibling;
 456         }
 457 }
 458
 459 static void __init scan_of_devices(void)
 460 {
 461         struct device_node *root = of_find_node_by_path("/");
 462         struct of_device *parent;
 463
 464         parent = scan_one_device(root, NULL);
 465         if (!parent)
 466                 return;
 467
 468         scan_tree(root->child, &parent->dev);
 469 }
 470
 471 static int __init of_bus_driver_init(void)
 472 {
 473         int err;
 474
 475         err = of_bus_type_init(&of_platform_bus_type, "of");
 476         if (!err)
 477                 scan_of_devices();
 478
 479         return err;
 480 }
 481
 482 postcore_initcall(of_bus_driver_init);
 483
 484 static int __init of_debug(char *str)
 485 {
 486         int val = 0;
 487
 488         get_option(&str, &val);
 489         if (val & 1)
 490                 of_resource_verbose = 1;
 491         return 1;
 492 }
 493
 494 __setup("of_debug=", of_debug);