Grant Likely | 6b884a8 | 2010-06-08 07:48:09 -0600 | [diff] [blame] | 1 | |
| 2 | #include <linux/io.h> |
| 3 | #include <linux/ioport.h> |
Grant Likely | dbbdee9 | 2010-06-08 07:48:10 -0600 | [diff] [blame] | 4 | #include <linux/module.h> |
Grant Likely | 6b884a8 | 2010-06-08 07:48:09 -0600 | [diff] [blame] | 5 | #include <linux/of_address.h> |
Grant Likely | dbbdee9 | 2010-06-08 07:48:10 -0600 | [diff] [blame] | 6 | #include <linux/pci_regs.h> |
| 7 | #include <linux/string.h> |
Grant Likely | 6b884a8 | 2010-06-08 07:48:09 -0600 | [diff] [blame] | 8 | |
Grant Likely | dbbdee9 | 2010-06-08 07:48:10 -0600 | [diff] [blame] | 9 | /* Max address size we deal with */ |
| 10 | #define OF_MAX_ADDR_CELLS 4 |
| 11 | #define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \ |
| 12 | (ns) > 0) |
| 13 | |
| 14 | static struct of_bus *of_match_bus(struct device_node *np); |
| 15 | static int __of_address_to_resource(struct device_node *dev, const u32 *addrp, |
| 16 | u64 size, unsigned int flags, |
| 17 | struct resource *r); |
| 18 | |
| 19 | /* Debug utility */ |
| 20 | #ifdef DEBUG |
| 21 | static void of_dump_addr(const char *s, const u32 *addr, int na) |
| 22 | { |
| 23 | printk(KERN_DEBUG "%s", s); |
| 24 | while (na--) |
Grant Likely | 154063a9 | 2010-06-08 07:48:11 -0600 | [diff] [blame] | 25 | printk(" %08x", be32_to_cpu(*(addr++))); |
Grant Likely | dbbdee9 | 2010-06-08 07:48:10 -0600 | [diff] [blame] | 26 | printk("\n"); |
| 27 | } |
| 28 | #else |
| 29 | static void of_dump_addr(const char *s, const u32 *addr, int na) { } |
| 30 | #endif |
| 31 | |
| 32 | /* Callbacks for bus specific translators */ |
| 33 | struct of_bus { |
| 34 | const char *name; |
| 35 | const char *addresses; |
| 36 | int (*match)(struct device_node *parent); |
| 37 | void (*count_cells)(struct device_node *child, |
| 38 | int *addrc, int *sizec); |
| 39 | u64 (*map)(u32 *addr, const u32 *range, |
| 40 | int na, int ns, int pna); |
| 41 | int (*translate)(u32 *addr, u64 offset, int na); |
| 42 | unsigned int (*get_flags)(const u32 *addr); |
| 43 | }; |
| 44 | |
| 45 | /* |
| 46 | * Default translator (generic bus) |
| 47 | */ |
| 48 | |
| 49 | static void of_bus_default_count_cells(struct device_node *dev, |
| 50 | int *addrc, int *sizec) |
| 51 | { |
| 52 | if (addrc) |
| 53 | *addrc = of_n_addr_cells(dev); |
| 54 | if (sizec) |
| 55 | *sizec = of_n_size_cells(dev); |
| 56 | } |
| 57 | |
| 58 | static u64 of_bus_default_map(u32 *addr, const u32 *range, |
| 59 | int na, int ns, int pna) |
| 60 | { |
| 61 | u64 cp, s, da; |
| 62 | |
| 63 | cp = of_read_number(range, na); |
| 64 | s = of_read_number(range + na + pna, ns); |
| 65 | da = of_read_number(addr, na); |
| 66 | |
| 67 | pr_debug("OF: default map, cp=%llx, s=%llx, da=%llx\n", |
| 68 | (unsigned long long)cp, (unsigned long long)s, |
| 69 | (unsigned long long)da); |
| 70 | |
| 71 | if (da < cp || da >= (cp + s)) |
| 72 | return OF_BAD_ADDR; |
| 73 | return da - cp; |
| 74 | } |
| 75 | |
| 76 | static int of_bus_default_translate(u32 *addr, u64 offset, int na) |
| 77 | { |
| 78 | u64 a = of_read_number(addr, na); |
| 79 | memset(addr, 0, na * 4); |
| 80 | a += offset; |
| 81 | if (na > 1) |
Grant Likely | 154063a9 | 2010-06-08 07:48:11 -0600 | [diff] [blame] | 82 | addr[na - 2] = cpu_to_be32(a >> 32); |
| 83 | addr[na - 1] = cpu_to_be32(a & 0xffffffffu); |
Grant Likely | dbbdee9 | 2010-06-08 07:48:10 -0600 | [diff] [blame] | 84 | |
| 85 | return 0; |
| 86 | } |
| 87 | |
| 88 | static unsigned int of_bus_default_get_flags(const u32 *addr) |
| 89 | { |
| 90 | return IORESOURCE_MEM; |
| 91 | } |
| 92 | |
| 93 | #ifdef CONFIG_PCI |
| 94 | /* |
| 95 | * PCI bus specific translator |
| 96 | */ |
| 97 | |
| 98 | static int of_bus_pci_match(struct device_node *np) |
| 99 | { |
| 100 | /* "vci" is for the /chaos bridge on 1st-gen PCI powermacs */ |
| 101 | return !strcmp(np->type, "pci") || !strcmp(np->type, "vci"); |
| 102 | } |
| 103 | |
| 104 | static void of_bus_pci_count_cells(struct device_node *np, |
| 105 | int *addrc, int *sizec) |
| 106 | { |
| 107 | if (addrc) |
| 108 | *addrc = 3; |
| 109 | if (sizec) |
| 110 | *sizec = 2; |
| 111 | } |
| 112 | |
| 113 | static unsigned int of_bus_pci_get_flags(const u32 *addr) |
| 114 | { |
| 115 | unsigned int flags = 0; |
| 116 | u32 w = addr[0]; |
| 117 | |
| 118 | switch((w >> 24) & 0x03) { |
| 119 | case 0x01: |
| 120 | flags |= IORESOURCE_IO; |
| 121 | break; |
| 122 | case 0x02: /* 32 bits */ |
| 123 | case 0x03: /* 64 bits */ |
| 124 | flags |= IORESOURCE_MEM; |
| 125 | break; |
| 126 | } |
| 127 | if (w & 0x40000000) |
| 128 | flags |= IORESOURCE_PREFETCH; |
| 129 | return flags; |
| 130 | } |
| 131 | |
| 132 | static u64 of_bus_pci_map(u32 *addr, const u32 *range, int na, int ns, int pna) |
| 133 | { |
| 134 | u64 cp, s, da; |
| 135 | unsigned int af, rf; |
| 136 | |
| 137 | af = of_bus_pci_get_flags(addr); |
| 138 | rf = of_bus_pci_get_flags(range); |
| 139 | |
| 140 | /* Check address type match */ |
| 141 | if ((af ^ rf) & (IORESOURCE_MEM | IORESOURCE_IO)) |
| 142 | return OF_BAD_ADDR; |
| 143 | |
| 144 | /* Read address values, skipping high cell */ |
| 145 | cp = of_read_number(range + 1, na - 1); |
| 146 | s = of_read_number(range + na + pna, ns); |
| 147 | da = of_read_number(addr + 1, na - 1); |
| 148 | |
| 149 | pr_debug("OF: PCI map, cp=%llx, s=%llx, da=%llx\n", |
| 150 | (unsigned long long)cp, (unsigned long long)s, |
| 151 | (unsigned long long)da); |
| 152 | |
| 153 | if (da < cp || da >= (cp + s)) |
| 154 | return OF_BAD_ADDR; |
| 155 | return da - cp; |
| 156 | } |
| 157 | |
| 158 | static int of_bus_pci_translate(u32 *addr, u64 offset, int na) |
| 159 | { |
| 160 | return of_bus_default_translate(addr + 1, offset, na - 1); |
| 161 | } |
| 162 | |
| 163 | const u32 *of_get_pci_address(struct device_node *dev, int bar_no, u64 *size, |
| 164 | unsigned int *flags) |
| 165 | { |
Jeremy Kerr | a9fadee | 2010-10-10 21:24:10 -0600 | [diff] [blame] | 166 | const __be32 *prop; |
Grant Likely | dbbdee9 | 2010-06-08 07:48:10 -0600 | [diff] [blame] | 167 | unsigned int psize; |
| 168 | struct device_node *parent; |
| 169 | struct of_bus *bus; |
| 170 | int onesize, i, na, ns; |
| 171 | |
| 172 | /* Get parent & match bus type */ |
| 173 | parent = of_get_parent(dev); |
| 174 | if (parent == NULL) |
| 175 | return NULL; |
| 176 | bus = of_match_bus(parent); |
| 177 | if (strcmp(bus->name, "pci")) { |
| 178 | of_node_put(parent); |
| 179 | return NULL; |
| 180 | } |
| 181 | bus->count_cells(dev, &na, &ns); |
| 182 | of_node_put(parent); |
| 183 | if (!OF_CHECK_COUNTS(na, ns)) |
| 184 | return NULL; |
| 185 | |
| 186 | /* Get "reg" or "assigned-addresses" property */ |
| 187 | prop = of_get_property(dev, bus->addresses, &psize); |
| 188 | if (prop == NULL) |
| 189 | return NULL; |
| 190 | psize /= 4; |
| 191 | |
| 192 | onesize = na + ns; |
Grant Likely | 154063a9 | 2010-06-08 07:48:11 -0600 | [diff] [blame] | 193 | for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++) { |
| 194 | u32 val = be32_to_cpu(prop[0]); |
| 195 | if ((val & 0xff) == ((bar_no * 4) + PCI_BASE_ADDRESS_0)) { |
Grant Likely | dbbdee9 | 2010-06-08 07:48:10 -0600 | [diff] [blame] | 196 | if (size) |
| 197 | *size = of_read_number(prop + na, ns); |
| 198 | if (flags) |
| 199 | *flags = bus->get_flags(prop); |
| 200 | return prop; |
| 201 | } |
Grant Likely | 154063a9 | 2010-06-08 07:48:11 -0600 | [diff] [blame] | 202 | } |
Grant Likely | dbbdee9 | 2010-06-08 07:48:10 -0600 | [diff] [blame] | 203 | return NULL; |
| 204 | } |
| 205 | EXPORT_SYMBOL(of_get_pci_address); |
| 206 | |
| 207 | int of_pci_address_to_resource(struct device_node *dev, int bar, |
| 208 | struct resource *r) |
| 209 | { |
| 210 | const u32 *addrp; |
| 211 | u64 size; |
| 212 | unsigned int flags; |
| 213 | |
| 214 | addrp = of_get_pci_address(dev, bar, &size, &flags); |
| 215 | if (addrp == NULL) |
| 216 | return -EINVAL; |
| 217 | return __of_address_to_resource(dev, addrp, size, flags, r); |
| 218 | } |
| 219 | EXPORT_SYMBOL_GPL(of_pci_address_to_resource); |
| 220 | #endif /* CONFIG_PCI */ |
| 221 | |
| 222 | /* |
| 223 | * ISA bus specific translator |
| 224 | */ |
| 225 | |
| 226 | static int of_bus_isa_match(struct device_node *np) |
| 227 | { |
| 228 | return !strcmp(np->name, "isa"); |
| 229 | } |
| 230 | |
| 231 | static void of_bus_isa_count_cells(struct device_node *child, |
| 232 | int *addrc, int *sizec) |
| 233 | { |
| 234 | if (addrc) |
| 235 | *addrc = 2; |
| 236 | if (sizec) |
| 237 | *sizec = 1; |
| 238 | } |
| 239 | |
| 240 | static u64 of_bus_isa_map(u32 *addr, const u32 *range, int na, int ns, int pna) |
| 241 | { |
| 242 | u64 cp, s, da; |
| 243 | |
| 244 | /* Check address type match */ |
| 245 | if ((addr[0] ^ range[0]) & 0x00000001) |
| 246 | return OF_BAD_ADDR; |
| 247 | |
| 248 | /* Read address values, skipping high cell */ |
| 249 | cp = of_read_number(range + 1, na - 1); |
| 250 | s = of_read_number(range + na + pna, ns); |
| 251 | da = of_read_number(addr + 1, na - 1); |
| 252 | |
| 253 | pr_debug("OF: ISA map, cp=%llx, s=%llx, da=%llx\n", |
| 254 | (unsigned long long)cp, (unsigned long long)s, |
| 255 | (unsigned long long)da); |
| 256 | |
| 257 | if (da < cp || da >= (cp + s)) |
| 258 | return OF_BAD_ADDR; |
| 259 | return da - cp; |
| 260 | } |
| 261 | |
| 262 | static int of_bus_isa_translate(u32 *addr, u64 offset, int na) |
| 263 | { |
| 264 | return of_bus_default_translate(addr + 1, offset, na - 1); |
| 265 | } |
| 266 | |
| 267 | static unsigned int of_bus_isa_get_flags(const u32 *addr) |
| 268 | { |
| 269 | unsigned int flags = 0; |
| 270 | u32 w = addr[0]; |
| 271 | |
| 272 | if (w & 1) |
| 273 | flags |= IORESOURCE_IO; |
| 274 | else |
| 275 | flags |= IORESOURCE_MEM; |
| 276 | return flags; |
| 277 | } |
| 278 | |
| 279 | /* |
| 280 | * Array of bus specific translators |
| 281 | */ |
| 282 | |
| 283 | static struct of_bus of_busses[] = { |
| 284 | #ifdef CONFIG_PCI |
| 285 | /* PCI */ |
| 286 | { |
| 287 | .name = "pci", |
| 288 | .addresses = "assigned-addresses", |
| 289 | .match = of_bus_pci_match, |
| 290 | .count_cells = of_bus_pci_count_cells, |
| 291 | .map = of_bus_pci_map, |
| 292 | .translate = of_bus_pci_translate, |
| 293 | .get_flags = of_bus_pci_get_flags, |
| 294 | }, |
| 295 | #endif /* CONFIG_PCI */ |
| 296 | /* ISA */ |
| 297 | { |
| 298 | .name = "isa", |
| 299 | .addresses = "reg", |
| 300 | .match = of_bus_isa_match, |
| 301 | .count_cells = of_bus_isa_count_cells, |
| 302 | .map = of_bus_isa_map, |
| 303 | .translate = of_bus_isa_translate, |
| 304 | .get_flags = of_bus_isa_get_flags, |
| 305 | }, |
| 306 | /* Default */ |
| 307 | { |
| 308 | .name = "default", |
| 309 | .addresses = "reg", |
| 310 | .match = NULL, |
| 311 | .count_cells = of_bus_default_count_cells, |
| 312 | .map = of_bus_default_map, |
| 313 | .translate = of_bus_default_translate, |
| 314 | .get_flags = of_bus_default_get_flags, |
| 315 | }, |
| 316 | }; |
| 317 | |
| 318 | static struct of_bus *of_match_bus(struct device_node *np) |
| 319 | { |
| 320 | int i; |
| 321 | |
| 322 | for (i = 0; i < ARRAY_SIZE(of_busses); i++) |
| 323 | if (!of_busses[i].match || of_busses[i].match(np)) |
| 324 | return &of_busses[i]; |
| 325 | BUG(); |
| 326 | return NULL; |
| 327 | } |
| 328 | |
| 329 | static int of_translate_one(struct device_node *parent, struct of_bus *bus, |
| 330 | struct of_bus *pbus, u32 *addr, |
| 331 | int na, int ns, int pna, const char *rprop) |
| 332 | { |
| 333 | const u32 *ranges; |
| 334 | unsigned int rlen; |
| 335 | int rone; |
| 336 | u64 offset = OF_BAD_ADDR; |
| 337 | |
| 338 | /* Normally, an absence of a "ranges" property means we are |
| 339 | * crossing a non-translatable boundary, and thus the addresses |
| 340 | * below the current not cannot be converted to CPU physical ones. |
| 341 | * Unfortunately, while this is very clear in the spec, it's not |
| 342 | * what Apple understood, and they do have things like /uni-n or |
| 343 | * /ht nodes with no "ranges" property and a lot of perfectly |
| 344 | * useable mapped devices below them. Thus we treat the absence of |
| 345 | * "ranges" as equivalent to an empty "ranges" property which means |
| 346 | * a 1:1 translation at that level. It's up to the caller not to try |
| 347 | * to translate addresses that aren't supposed to be translated in |
| 348 | * the first place. --BenH. |
Grant Likely | 3930f29 | 2010-06-08 07:48:11 -0600 | [diff] [blame] | 349 | * |
| 350 | * As far as we know, this damage only exists on Apple machines, so |
| 351 | * This code is only enabled on powerpc. --gcl |
Grant Likely | dbbdee9 | 2010-06-08 07:48:10 -0600 | [diff] [blame] | 352 | */ |
| 353 | ranges = of_get_property(parent, rprop, &rlen); |
Grant Likely | 3930f29 | 2010-06-08 07:48:11 -0600 | [diff] [blame] | 354 | #if !defined(CONFIG_PPC) |
| 355 | if (ranges == NULL) { |
| 356 | pr_err("OF: no ranges; cannot translate\n"); |
| 357 | return 1; |
| 358 | } |
| 359 | #endif /* !defined(CONFIG_PPC) */ |
Grant Likely | dbbdee9 | 2010-06-08 07:48:10 -0600 | [diff] [blame] | 360 | if (ranges == NULL || rlen == 0) { |
| 361 | offset = of_read_number(addr, na); |
| 362 | memset(addr, 0, pna * 4); |
Grant Likely | 3930f29 | 2010-06-08 07:48:11 -0600 | [diff] [blame] | 363 | pr_debug("OF: empty ranges; 1:1 translation\n"); |
Grant Likely | dbbdee9 | 2010-06-08 07:48:10 -0600 | [diff] [blame] | 364 | goto finish; |
| 365 | } |
| 366 | |
| 367 | pr_debug("OF: walking ranges...\n"); |
| 368 | |
| 369 | /* Now walk through the ranges */ |
| 370 | rlen /= 4; |
| 371 | rone = na + pna + ns; |
| 372 | for (; rlen >= rone; rlen -= rone, ranges += rone) { |
| 373 | offset = bus->map(addr, ranges, na, ns, pna); |
| 374 | if (offset != OF_BAD_ADDR) |
| 375 | break; |
| 376 | } |
| 377 | if (offset == OF_BAD_ADDR) { |
| 378 | pr_debug("OF: not found !\n"); |
| 379 | return 1; |
| 380 | } |
| 381 | memcpy(addr, ranges + na, 4 * pna); |
| 382 | |
| 383 | finish: |
| 384 | of_dump_addr("OF: parent translation for:", addr, pna); |
| 385 | pr_debug("OF: with offset: %llx\n", (unsigned long long)offset); |
| 386 | |
| 387 | /* Translate it into parent bus space */ |
| 388 | return pbus->translate(addr, offset, pna); |
| 389 | } |
| 390 | |
| 391 | /* |
| 392 | * Translate an address from the device-tree into a CPU physical address, |
| 393 | * this walks up the tree and applies the various bus mappings on the |
| 394 | * way. |
| 395 | * |
| 396 | * Note: We consider that crossing any level with #size-cells == 0 to mean |
| 397 | * that translation is impossible (that is we are not dealing with a value |
| 398 | * that can be mapped to a cpu physical address). This is not really specified |
| 399 | * that way, but this is traditionally the way IBM at least do things |
| 400 | */ |
| 401 | u64 __of_translate_address(struct device_node *dev, const u32 *in_addr, |
| 402 | const char *rprop) |
| 403 | { |
| 404 | struct device_node *parent = NULL; |
| 405 | struct of_bus *bus, *pbus; |
| 406 | u32 addr[OF_MAX_ADDR_CELLS]; |
| 407 | int na, ns, pna, pns; |
| 408 | u64 result = OF_BAD_ADDR; |
| 409 | |
| 410 | pr_debug("OF: ** translation for device %s **\n", dev->full_name); |
| 411 | |
| 412 | /* Increase refcount at current level */ |
| 413 | of_node_get(dev); |
| 414 | |
| 415 | /* Get parent & match bus type */ |
| 416 | parent = of_get_parent(dev); |
| 417 | if (parent == NULL) |
| 418 | goto bail; |
| 419 | bus = of_match_bus(parent); |
| 420 | |
| 421 | /* Cound address cells & copy address locally */ |
| 422 | bus->count_cells(dev, &na, &ns); |
| 423 | if (!OF_CHECK_COUNTS(na, ns)) { |
| 424 | printk(KERN_ERR "prom_parse: Bad cell count for %s\n", |
| 425 | dev->full_name); |
| 426 | goto bail; |
| 427 | } |
| 428 | memcpy(addr, in_addr, na * 4); |
| 429 | |
| 430 | pr_debug("OF: bus is %s (na=%d, ns=%d) on %s\n", |
| 431 | bus->name, na, ns, parent->full_name); |
| 432 | of_dump_addr("OF: translating address:", addr, na); |
| 433 | |
| 434 | /* Translate */ |
| 435 | for (;;) { |
| 436 | /* Switch to parent bus */ |
| 437 | of_node_put(dev); |
| 438 | dev = parent; |
| 439 | parent = of_get_parent(dev); |
| 440 | |
| 441 | /* If root, we have finished */ |
| 442 | if (parent == NULL) { |
| 443 | pr_debug("OF: reached root node\n"); |
| 444 | result = of_read_number(addr, na); |
| 445 | break; |
| 446 | } |
| 447 | |
| 448 | /* Get new parent bus and counts */ |
| 449 | pbus = of_match_bus(parent); |
| 450 | pbus->count_cells(dev, &pna, &pns); |
| 451 | if (!OF_CHECK_COUNTS(pna, pns)) { |
| 452 | printk(KERN_ERR "prom_parse: Bad cell count for %s\n", |
| 453 | dev->full_name); |
| 454 | break; |
| 455 | } |
| 456 | |
| 457 | pr_debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n", |
| 458 | pbus->name, pna, pns, parent->full_name); |
| 459 | |
| 460 | /* Apply bus translation */ |
| 461 | if (of_translate_one(dev, bus, pbus, addr, na, ns, pna, rprop)) |
| 462 | break; |
| 463 | |
| 464 | /* Complete the move up one level */ |
| 465 | na = pna; |
| 466 | ns = pns; |
| 467 | bus = pbus; |
| 468 | |
| 469 | of_dump_addr("OF: one level translation:", addr, na); |
| 470 | } |
| 471 | bail: |
| 472 | of_node_put(parent); |
| 473 | of_node_put(dev); |
| 474 | |
| 475 | return result; |
| 476 | } |
| 477 | |
| 478 | u64 of_translate_address(struct device_node *dev, const u32 *in_addr) |
| 479 | { |
| 480 | return __of_translate_address(dev, in_addr, "ranges"); |
| 481 | } |
| 482 | EXPORT_SYMBOL(of_translate_address); |
| 483 | |
| 484 | u64 of_translate_dma_address(struct device_node *dev, const u32 *in_addr) |
| 485 | { |
| 486 | return __of_translate_address(dev, in_addr, "dma-ranges"); |
| 487 | } |
| 488 | EXPORT_SYMBOL(of_translate_dma_address); |
| 489 | |
| 490 | const u32 *of_get_address(struct device_node *dev, int index, u64 *size, |
| 491 | unsigned int *flags) |
| 492 | { |
| 493 | const u32 *prop; |
| 494 | unsigned int psize; |
| 495 | struct device_node *parent; |
| 496 | struct of_bus *bus; |
| 497 | int onesize, i, na, ns; |
| 498 | |
| 499 | /* Get parent & match bus type */ |
| 500 | parent = of_get_parent(dev); |
| 501 | if (parent == NULL) |
| 502 | return NULL; |
| 503 | bus = of_match_bus(parent); |
| 504 | bus->count_cells(dev, &na, &ns); |
| 505 | of_node_put(parent); |
| 506 | if (!OF_CHECK_COUNTS(na, ns)) |
| 507 | return NULL; |
| 508 | |
| 509 | /* Get "reg" or "assigned-addresses" property */ |
| 510 | prop = of_get_property(dev, bus->addresses, &psize); |
| 511 | if (prop == NULL) |
| 512 | return NULL; |
| 513 | psize /= 4; |
| 514 | |
| 515 | onesize = na + ns; |
| 516 | for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++) |
| 517 | if (i == index) { |
| 518 | if (size) |
| 519 | *size = of_read_number(prop + na, ns); |
| 520 | if (flags) |
| 521 | *flags = bus->get_flags(prop); |
| 522 | return prop; |
| 523 | } |
| 524 | return NULL; |
| 525 | } |
| 526 | EXPORT_SYMBOL(of_get_address); |
| 527 | |
| 528 | static int __of_address_to_resource(struct device_node *dev, const u32 *addrp, |
| 529 | u64 size, unsigned int flags, |
| 530 | struct resource *r) |
Grant Likely | 1f5bef3 | 2010-06-08 07:48:09 -0600 | [diff] [blame] | 531 | { |
| 532 | u64 taddr; |
| 533 | |
| 534 | if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0) |
| 535 | return -EINVAL; |
| 536 | taddr = of_translate_address(dev, addrp); |
| 537 | if (taddr == OF_BAD_ADDR) |
| 538 | return -EINVAL; |
| 539 | memset(r, 0, sizeof(struct resource)); |
| 540 | if (flags & IORESOURCE_IO) { |
| 541 | unsigned long port; |
| 542 | port = pci_address_to_pio(taddr); |
| 543 | if (port == (unsigned long)-1) |
| 544 | return -EINVAL; |
| 545 | r->start = port; |
| 546 | r->end = port + size - 1; |
| 547 | } else { |
| 548 | r->start = taddr; |
| 549 | r->end = taddr + size - 1; |
| 550 | } |
| 551 | r->flags = flags; |
Grant Likely | d3571c3 | 2010-06-08 07:48:12 -0600 | [diff] [blame] | 552 | r->name = dev->full_name; |
Grant Likely | 1f5bef3 | 2010-06-08 07:48:09 -0600 | [diff] [blame] | 553 | return 0; |
| 554 | } |
| 555 | |
| 556 | /** |
| 557 | * of_address_to_resource - Translate device tree address and return as resource |
| 558 | * |
| 559 | * Note that if your address is a PIO address, the conversion will fail if |
| 560 | * the physical address can't be internally converted to an IO token with |
| 561 | * pci_address_to_pio(), that is because it's either called to early or it |
| 562 | * can't be matched to any host bridge IO space |
| 563 | */ |
| 564 | int of_address_to_resource(struct device_node *dev, int index, |
| 565 | struct resource *r) |
| 566 | { |
| 567 | const u32 *addrp; |
| 568 | u64 size; |
| 569 | unsigned int flags; |
| 570 | |
| 571 | addrp = of_get_address(dev, index, &size, &flags); |
| 572 | if (addrp == NULL) |
| 573 | return -EINVAL; |
| 574 | return __of_address_to_resource(dev, addrp, size, flags, r); |
| 575 | } |
| 576 | EXPORT_SYMBOL_GPL(of_address_to_resource); |
| 577 | |
| 578 | |
Grant Likely | 6b884a8 | 2010-06-08 07:48:09 -0600 | [diff] [blame] | 579 | /** |
| 580 | * of_iomap - Maps the memory mapped IO for a given device_node |
| 581 | * @device: the device whose io range will be mapped |
| 582 | * @index: index of the io range |
| 583 | * |
| 584 | * Returns a pointer to the mapped memory |
| 585 | */ |
| 586 | void __iomem *of_iomap(struct device_node *np, int index) |
| 587 | { |
| 588 | struct resource res; |
| 589 | |
| 590 | if (of_address_to_resource(np, index, &res)) |
| 591 | return NULL; |
| 592 | |
| 593 | return ioremap(res.start, 1 + res.end - res.start); |
| 594 | } |
| 595 | EXPORT_SYMBOL(of_iomap); |