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/mod_devicetable.h>
   6 #include <linux/slab.h>
   7 #include <linux/errno.h>
   8 #include <linux/irq.h>
   9 #include <linux/of_device.h>
  10 #include <linux/of_platform.h>
  11 #include <asm/leon.h>
  12 #include <asm/leon_amba.h>
  13
  14 #include "of_device_common.h"
  15 #include "irq.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 platform_device *op,
 245                                           struct device *parent)
 246 {
 247         struct platform_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_platform_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         op->resource = op->archdata.resource;
 271         op->num_resources = num_reg;
 272         for (index = 0; index < num_reg; index++) {
 273                 struct resource *r = &op->resource[index];
 274                 u32 addr[OF_MAX_ADDR_CELLS];
 275                 const u32 *reg = (preg + (index * ((na + ns) * 4)));
 276                 struct device_node *dp = op->dev.of_node;
 277                 struct device_node *pp = p_op->dev.of_node;
 278                 struct of_bus *pbus, *dbus;
 279                 u64 size, result = OF_BAD_ADDR;
 280                 unsigned long flags;
 281                 int dna, dns;
 282                 int pna, pns;
 283
 284                 size = of_read_addr(reg + na, ns);
 285
 286                 memcpy(addr, reg, na * 4);
 287
 288                 flags = bus->get_flags(reg, 0);
 289
 290                 if (use_1to1_mapping(pp)) {
 291                         result = of_read_addr(addr, na);
 292                         goto build_res;
 293                 }
 294
 295                 dna = na;
 296                 dns = ns;
 297                 dbus = bus;
 298
 299                 while (1) {
 300                         dp = pp;
 301                         pp = dp->parent;
 302                         if (!pp) {
 303                                 result = of_read_addr(addr, dna);
 304                                 break;
 305                         }
 306
 307                         pbus = of_match_bus(pp);
 308                         pbus->count_cells(dp, &pna, &pns);
 309
 310                         if (build_one_resource(dp, dbus, pbus, addr,
 311                                                dna, dns, pna))
 312                                 break;
 313
 314                         flags = pbus->get_flags(addr, flags);
 315
 316                         dna = pna;
 317                         dns = pns;
 318                         dbus = pbus;
 319                 }
 320
 321         build_res:
 322                 memset(r, 0, sizeof(*r));
 323
 324                 if (of_resource_verbose)
 325                         printk("%s reg[%d] -> %llx\n",
 326                                op->dev.of_node->full_name, index,
 327                                result);
 328
 329                 if (result != OF_BAD_ADDR) {
 330                         r->start = result & 0xffffffff;
 331                         r->end = result + size - 1;
 332                         r->flags = flags | ((result >> 32ULL) & 0xffUL);
 333                 }
 334                 r->name = op->dev.of_node->name;
 335         }
 336 }
 337
 338 static struct platform_device * __init scan_one_device(struct device_node *dp,
 339                                                  struct device *parent)
 340 {
 341         struct platform_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
 342         const struct linux_prom_irqs *intr;
 343         struct dev_archdata *sd;
 344         int len, i;
 345
 346         if (!op)
 347                 return NULL;
 348
 349         sd = &op->dev.archdata;
 350         sd->op = op;
 351
 352         op->dev.of_node = dp;
 353
 354         intr = of_get_property(dp, "intr", &len);
 355         if (intr) {
 356                 op->archdata.num_irqs = len / sizeof(struct linux_prom_irqs);
 357                 for (i = 0; i < op->archdata.num_irqs; i++)
 358                         op->archdata.irqs[i] =
 359                             sparc_irq_config.build_device_irq(op, intr[i].pri);
 360         } else {
 361                 const unsigned int *irq =
 362                         of_get_property(dp, "interrupts", &len);
 363
 364                 if (irq) {
 365                         op->archdata.num_irqs = len / sizeof(unsigned int);
 366                         for (i = 0; i < op->archdata.num_irqs; i++)
 367                                 op->archdata.irqs[i] =
 368                                     sparc_irq_config.build_device_irq(op, irq[i]);
 369                 } else {
 370                         op->archdata.num_irqs = 0;
 371                 }
 372         }
 373
 374         build_device_resources(op, parent);
 375
 376         op->dev.parent = parent;
 377         op->dev.bus = &platform_bus_type;
 378         if (!parent)
 379                 dev_set_name(&op->dev, "root");
 380         else
 381                 dev_set_name(&op->dev, "%08x", dp->phandle);
 382
 383         if (of_device_register(op)) {
 384                 printk("%s: Could not register of device.\n",
 385                        dp->full_name);
 386                 kfree(op);
 387                 op = NULL;
 388         }
 389
 390         return op;
 391 }
 392
 393 static void __init scan_tree(struct device_node *dp, struct device *parent)
 394 {
 395         while (dp) {
 396                 struct platform_device *op = scan_one_device(dp, parent);
 397
 398                 if (op)
 399                         scan_tree(dp->child, &op->dev);
 400
 401                 dp = dp->sibling;
 402         }
 403 }
 404
 405 static int __init scan_of_devices(void)
 406 {
 407         struct device_node *root = of_find_node_by_path("/");
 408         struct platform_device *parent;
 409
 410         parent = scan_one_device(root, NULL);
 411         if (!parent)
 412                 return 0;
 413
 414         scan_tree(root->child, &parent->dev);
 415         return 0;
 416 }
 417 postcore_initcall(scan_of_devices);
 418
 419 static int __init of_debug(char *str)
 420 {
 421         int val = 0;
 422
 423         get_option(&str, &val);
 424         if (val & 1)
 425                 of_resource_verbose = 1;
 426         return 1;
 427 }
 428
 429 __setup("of_debug=", of_debug);