1 /* 2 * Copyright (c) 2011 The Chromium OS Authors. 3 * SPDX-License-Identifier: GPL-2.0+ 4 */ 5 6 #ifndef USE_HOSTCC 7 #include <common.h> 8 #include <errno.h> 9 #include <serial.h> 10 #include <libfdt.h> 11 #include <fdtdec.h> 12 #include <linux/ctype.h> 13 14 #include <asm/gpio.h> 15 16 DECLARE_GLOBAL_DATA_PTR; 17 18 /* 19 * Here are the type we know about. One day we might allow drivers to 20 * register. For now we just put them here. The COMPAT macro allows us to 21 * turn this into a sparse list later, and keeps the ID with the name. 22 */ 23 #define COMPAT(id, name) name 24 static const char * const compat_names[COMPAT_COUNT] = { 25 COMPAT(UNKNOWN, "<none>"), 26 COMPAT(NVIDIA_TEGRA20_USB, "nvidia,tegra20-ehci"), 27 COMPAT(NVIDIA_TEGRA30_USB, "nvidia,tegra30-ehci"), 28 COMPAT(NVIDIA_TEGRA114_USB, "nvidia,tegra114-ehci"), 29 COMPAT(NVIDIA_TEGRA114_I2C, "nvidia,tegra114-i2c"), 30 COMPAT(NVIDIA_TEGRA20_I2C, "nvidia,tegra20-i2c"), 31 COMPAT(NVIDIA_TEGRA20_DVC, "nvidia,tegra20-i2c-dvc"), 32 COMPAT(NVIDIA_TEGRA20_EMC, "nvidia,tegra20-emc"), 33 COMPAT(NVIDIA_TEGRA20_EMC_TABLE, "nvidia,tegra20-emc-table"), 34 COMPAT(NVIDIA_TEGRA20_KBC, "nvidia,tegra20-kbc"), 35 COMPAT(NVIDIA_TEGRA20_NAND, "nvidia,tegra20-nand"), 36 COMPAT(NVIDIA_TEGRA20_PWM, "nvidia,tegra20-pwm"), 37 COMPAT(NVIDIA_TEGRA20_DC, "nvidia,tegra20-dc"), 38 COMPAT(NVIDIA_TEGRA124_SDMMC, "nvidia,tegra124-sdhci"), 39 COMPAT(NVIDIA_TEGRA30_SDMMC, "nvidia,tegra30-sdhci"), 40 COMPAT(NVIDIA_TEGRA20_SDMMC, "nvidia,tegra20-sdhci"), 41 COMPAT(NVIDIA_TEGRA20_SFLASH, "nvidia,tegra20-sflash"), 42 COMPAT(NVIDIA_TEGRA20_SLINK, "nvidia,tegra20-slink"), 43 COMPAT(NVIDIA_TEGRA114_SPI, "nvidia,tegra114-spi"), 44 COMPAT(SMSC_LAN9215, "smsc,lan9215"), 45 COMPAT(SAMSUNG_EXYNOS5_SROMC, "samsung,exynos-sromc"), 46 COMPAT(SAMSUNG_S3C2440_I2C, "samsung,s3c2440-i2c"), 47 COMPAT(SAMSUNG_EXYNOS5_SOUND, "samsung,exynos-sound"), 48 COMPAT(WOLFSON_WM8994_CODEC, "wolfson,wm8994-codec"), 49 COMPAT(SAMSUNG_EXYNOS_SPI, "samsung,exynos-spi"), 50 COMPAT(GOOGLE_CROS_EC, "google,cros-ec"), 51 COMPAT(GOOGLE_CROS_EC_KEYB, "google,cros-ec-keyb"), 52 COMPAT(SAMSUNG_EXYNOS_EHCI, "samsung,exynos-ehci"), 53 COMPAT(SAMSUNG_EXYNOS5_XHCI, "samsung,exynos5250-xhci"), 54 COMPAT(SAMSUNG_EXYNOS_USB_PHY, "samsung,exynos-usb-phy"), 55 COMPAT(SAMSUNG_EXYNOS5_USB3_PHY, "samsung,exynos5250-usb3-phy"), 56 COMPAT(SAMSUNG_EXYNOS_TMU, "samsung,exynos-tmu"), 57 COMPAT(SAMSUNG_EXYNOS_FIMD, "samsung,exynos-fimd"), 58 COMPAT(SAMSUNG_EXYNOS_MIPI_DSI, "samsung,exynos-mipi-dsi"), 59 COMPAT(SAMSUNG_EXYNOS5_DP, "samsung,exynos5-dp"), 60 COMPAT(SAMSUNG_EXYNOS_DWMMC, "samsung,exynos-dwmmc"), 61 COMPAT(SAMSUNG_EXYNOS_MMC, "samsung,exynos-mmc"), 62 COMPAT(SAMSUNG_EXYNOS_SERIAL, "samsung,exynos4210-uart"), 63 COMPAT(MAXIM_MAX77686_PMIC, "maxim,max77686_pmic"), 64 COMPAT(GENERIC_SPI_FLASH, "spi-flash"), 65 COMPAT(MAXIM_98095_CODEC, "maxim,max98095-codec"), 66 COMPAT(INFINEON_SLB9635_TPM, "infineon,slb9635-tpm"), 67 COMPAT(INFINEON_SLB9645_TPM, "infineon,slb9645-tpm"), 68 COMPAT(SAMSUNG_EXYNOS5_I2C, "samsung,exynos5-hsi2c"), 69 COMPAT(SANDBOX_HOST_EMULATION, "sandbox,host-emulation"), 70 COMPAT(SANDBOX_LCD_SDL, "sandbox,lcd-sdl"), 71 COMPAT(TI_TPS65090, "ti,tps65090"), 72 COMPAT(COMPAT_NXP_PTN3460, "nxp,ptn3460"), 73 }; 74 75 const char *fdtdec_get_compatible(enum fdt_compat_id id) 76 { 77 /* We allow reading of the 'unknown' ID for testing purposes */ 78 assert(id >= 0 && id < COMPAT_COUNT); 79 return compat_names[id]; 80 } 81 82 fdt_addr_t fdtdec_get_addr_size(const void *blob, int node, 83 const char *prop_name, fdt_size_t *sizep) 84 { 85 const fdt_addr_t *cell; 86 int len; 87 88 debug("%s: %s: ", __func__, prop_name); 89 cell = fdt_getprop(blob, node, prop_name, &len); 90 if (cell && ((!sizep && len == sizeof(fdt_addr_t)) || 91 len == sizeof(fdt_addr_t) * 2)) { 92 fdt_addr_t addr = fdt_addr_to_cpu(*cell); 93 if (sizep) { 94 const fdt_size_t *size; 95 96 size = (fdt_size_t *)((char *)cell + 97 sizeof(fdt_addr_t)); 98 *sizep = fdt_size_to_cpu(*size); 99 debug("addr=%08lx, size=%08x\n", 100 (ulong)addr, *sizep); 101 } else { 102 debug("%08lx\n", (ulong)addr); 103 } 104 return addr; 105 } 106 debug("(not found)\n"); 107 return FDT_ADDR_T_NONE; 108 } 109 110 fdt_addr_t fdtdec_get_addr(const void *blob, int node, 111 const char *prop_name) 112 { 113 return fdtdec_get_addr_size(blob, node, prop_name, NULL); 114 } 115 116 uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name, 117 uint64_t default_val) 118 { 119 const uint64_t *cell64; 120 int length; 121 122 cell64 = fdt_getprop(blob, node, prop_name, &length); 123 if (!cell64 || length < sizeof(*cell64)) 124 return default_val; 125 126 return fdt64_to_cpu(*cell64); 127 } 128 129 int fdtdec_get_is_enabled(const void *blob, int node) 130 { 131 const char *cell; 132 133 /* 134 * It should say "okay", so only allow that. Some fdts use "ok" but 135 * this is a bug. Please fix your device tree source file. See here 136 * for discussion: 137 * 138 * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html 139 */ 140 cell = fdt_getprop(blob, node, "status", NULL); 141 if (cell) 142 return 0 == strcmp(cell, "okay"); 143 return 1; 144 } 145 146 enum fdt_compat_id fdtdec_lookup(const void *blob, int node) 147 { 148 enum fdt_compat_id id; 149 150 /* Search our drivers */ 151 for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++) 152 if (0 == fdt_node_check_compatible(blob, node, 153 compat_names[id])) 154 return id; 155 return COMPAT_UNKNOWN; 156 } 157 158 int fdtdec_next_compatible(const void *blob, int node, 159 enum fdt_compat_id id) 160 { 161 return fdt_node_offset_by_compatible(blob, node, compat_names[id]); 162 } 163 164 int fdtdec_next_compatible_subnode(const void *blob, int node, 165 enum fdt_compat_id id, int *depthp) 166 { 167 do { 168 node = fdt_next_node(blob, node, depthp); 169 } while (*depthp > 1); 170 171 /* If this is a direct subnode, and compatible, return it */ 172 if (*depthp == 1 && 0 == fdt_node_check_compatible( 173 blob, node, compat_names[id])) 174 return node; 175 176 return -FDT_ERR_NOTFOUND; 177 } 178 179 int fdtdec_next_alias(const void *blob, const char *name, 180 enum fdt_compat_id id, int *upto) 181 { 182 #define MAX_STR_LEN 20 183 char str[MAX_STR_LEN + 20]; 184 int node, err; 185 186 /* snprintf() is not available */ 187 assert(strlen(name) < MAX_STR_LEN); 188 sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto); 189 node = fdt_path_offset(blob, str); 190 if (node < 0) 191 return node; 192 err = fdt_node_check_compatible(blob, node, compat_names[id]); 193 if (err < 0) 194 return err; 195 if (err) 196 return -FDT_ERR_NOTFOUND; 197 (*upto)++; 198 return node; 199 } 200 201 int fdtdec_find_aliases_for_id(const void *blob, const char *name, 202 enum fdt_compat_id id, int *node_list, int maxcount) 203 { 204 memset(node_list, '\0', sizeof(*node_list) * maxcount); 205 206 return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount); 207 } 208 209 /* TODO: Can we tighten this code up a little? */ 210 int fdtdec_add_aliases_for_id(const void *blob, const char *name, 211 enum fdt_compat_id id, int *node_list, int maxcount) 212 { 213 int name_len = strlen(name); 214 int nodes[maxcount]; 215 int num_found = 0; 216 int offset, node; 217 int alias_node; 218 int count; 219 int i, j; 220 221 /* find the alias node if present */ 222 alias_node = fdt_path_offset(blob, "/aliases"); 223 224 /* 225 * start with nothing, and we can assume that the root node can't 226 * match 227 */ 228 memset(nodes, '\0', sizeof(nodes)); 229 230 /* First find all the compatible nodes */ 231 for (node = count = 0; node >= 0 && count < maxcount;) { 232 node = fdtdec_next_compatible(blob, node, id); 233 if (node >= 0) 234 nodes[count++] = node; 235 } 236 if (node >= 0) 237 debug("%s: warning: maxcount exceeded with alias '%s'\n", 238 __func__, name); 239 240 /* Now find all the aliases */ 241 for (offset = fdt_first_property_offset(blob, alias_node); 242 offset > 0; 243 offset = fdt_next_property_offset(blob, offset)) { 244 const struct fdt_property *prop; 245 const char *path; 246 int number; 247 int found; 248 249 node = 0; 250 prop = fdt_get_property_by_offset(blob, offset, NULL); 251 path = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); 252 if (prop->len && 0 == strncmp(path, name, name_len)) 253 node = fdt_path_offset(blob, prop->data); 254 if (node <= 0) 255 continue; 256 257 /* Get the alias number */ 258 number = simple_strtoul(path + name_len, NULL, 10); 259 if (number < 0 || number >= maxcount) { 260 debug("%s: warning: alias '%s' is out of range\n", 261 __func__, path); 262 continue; 263 } 264 265 /* Make sure the node we found is actually in our list! */ 266 found = -1; 267 for (j = 0; j < count; j++) 268 if (nodes[j] == node) { 269 found = j; 270 break; 271 } 272 273 if (found == -1) { 274 debug("%s: warning: alias '%s' points to a node " 275 "'%s' that is missing or is not compatible " 276 " with '%s'\n", __func__, path, 277 fdt_get_name(blob, node, NULL), 278 compat_names[id]); 279 continue; 280 } 281 282 /* 283 * Add this node to our list in the right place, and mark 284 * it as done. 285 */ 286 if (fdtdec_get_is_enabled(blob, node)) { 287 if (node_list[number]) { 288 debug("%s: warning: alias '%s' requires that " 289 "a node be placed in the list in a " 290 "position which is already filled by " 291 "node '%s'\n", __func__, path, 292 fdt_get_name(blob, node, NULL)); 293 continue; 294 } 295 node_list[number] = node; 296 if (number >= num_found) 297 num_found = number + 1; 298 } 299 nodes[found] = 0; 300 } 301 302 /* Add any nodes not mentioned by an alias */ 303 for (i = j = 0; i < maxcount; i++) { 304 if (!node_list[i]) { 305 for (; j < maxcount; j++) 306 if (nodes[j] && 307 fdtdec_get_is_enabled(blob, nodes[j])) 308 break; 309 310 /* Have we run out of nodes to add? */ 311 if (j == maxcount) 312 break; 313 314 assert(!node_list[i]); 315 node_list[i] = nodes[j++]; 316 if (i >= num_found) 317 num_found = i + 1; 318 } 319 } 320 321 return num_found; 322 } 323 324 int fdtdec_get_alias_seq(const void *blob, const char *base, int offset, 325 int *seqp) 326 { 327 int base_len = strlen(base); 328 const char *find_name; 329 int find_namelen; 330 int prop_offset; 331 int aliases; 332 333 find_name = fdt_get_name(blob, offset, &find_namelen); 334 debug("Looking for '%s' at %d, name %s\n", base, offset, find_name); 335 336 aliases = fdt_path_offset(blob, "/aliases"); 337 for (prop_offset = fdt_first_property_offset(blob, aliases); 338 prop_offset > 0; 339 prop_offset = fdt_next_property_offset(blob, prop_offset)) { 340 const char *prop; 341 const char *name; 342 const char *slash; 343 const char *p; 344 int len; 345 346 prop = fdt_getprop_by_offset(blob, prop_offset, &name, &len); 347 debug(" - %s, %s\n", name, prop); 348 if (len < find_namelen || *prop != '/' || prop[len - 1] || 349 strncmp(name, base, base_len)) 350 continue; 351 352 slash = strrchr(prop, '/'); 353 if (strcmp(slash + 1, find_name)) 354 continue; 355 for (p = name; *p; p++) { 356 if (isdigit(*p)) { 357 *seqp = simple_strtoul(p, NULL, 10); 358 debug("Found seq %d\n", *seqp); 359 return 0; 360 } 361 } 362 } 363 364 debug("Not found\n"); 365 return -ENOENT; 366 } 367 368 int fdtdec_get_alias_node(const void *blob, const char *name) 369 { 370 const char *prop; 371 int alias_node; 372 int len; 373 374 if (!blob) 375 return -FDT_ERR_NOTFOUND; 376 alias_node = fdt_path_offset(blob, "/aliases"); 377 prop = fdt_getprop(blob, alias_node, name, &len); 378 if (!prop) 379 return -FDT_ERR_NOTFOUND; 380 return fdt_path_offset(blob, prop); 381 } 382 383 int fdtdec_get_chosen_node(const void *blob, const char *name) 384 { 385 const char *prop; 386 int chosen_node; 387 int len; 388 389 if (!blob) 390 return -FDT_ERR_NOTFOUND; 391 chosen_node = fdt_path_offset(blob, "/chosen"); 392 prop = fdt_getprop(blob, chosen_node, name, &len); 393 if (!prop) 394 return -FDT_ERR_NOTFOUND; 395 return fdt_path_offset(blob, prop); 396 } 397 398 int fdtdec_check_fdt(void) 399 { 400 /* 401 * We must have an FDT, but we cannot panic() yet since the console 402 * is not ready. So for now, just assert(). Boards which need an early 403 * FDT (prior to console ready) will need to make their own 404 * arrangements and do their own checks. 405 */ 406 assert(!fdtdec_prepare_fdt()); 407 return 0; 408 } 409 410 /* 411 * This function is a little odd in that it accesses global data. At some 412 * point if the architecture board.c files merge this will make more sense. 413 * Even now, it is common code. 414 */ 415 int fdtdec_prepare_fdt(void) 416 { 417 if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) || 418 fdt_check_header(gd->fdt_blob)) { 419 printf("No valid FDT found - please append one to U-Boot " 420 "binary, use u-boot-dtb.bin or define " 421 "CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>\n"); 422 return -1; 423 } 424 return 0; 425 } 426 427 int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name) 428 { 429 const u32 *phandle; 430 int lookup; 431 432 debug("%s: %s\n", __func__, prop_name); 433 phandle = fdt_getprop(blob, node, prop_name, NULL); 434 if (!phandle) 435 return -FDT_ERR_NOTFOUND; 436 437 lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle)); 438 return lookup; 439 } 440 441 /** 442 * Look up a property in a node and check that it has a minimum length. 443 * 444 * @param blob FDT blob 445 * @param node node to examine 446 * @param prop_name name of property to find 447 * @param min_len minimum property length in bytes 448 * @param err 0 if ok, or -FDT_ERR_NOTFOUND if the property is not 449 found, or -FDT_ERR_BADLAYOUT if not enough data 450 * @return pointer to cell, which is only valid if err == 0 451 */ 452 static const void *get_prop_check_min_len(const void *blob, int node, 453 const char *prop_name, int min_len, int *err) 454 { 455 const void *cell; 456 int len; 457 458 debug("%s: %s\n", __func__, prop_name); 459 cell = fdt_getprop(blob, node, prop_name, &len); 460 if (!cell) 461 *err = -FDT_ERR_NOTFOUND; 462 else if (len < min_len) 463 *err = -FDT_ERR_BADLAYOUT; 464 else 465 *err = 0; 466 return cell; 467 } 468 469 int fdtdec_get_int_array(const void *blob, int node, const char *prop_name, 470 u32 *array, int count) 471 { 472 const u32 *cell; 473 int i, err = 0; 474 475 debug("%s: %s\n", __func__, prop_name); 476 cell = get_prop_check_min_len(blob, node, prop_name, 477 sizeof(u32) * count, &err); 478 if (!err) { 479 for (i = 0; i < count; i++) 480 array[i] = fdt32_to_cpu(cell[i]); 481 } 482 return err; 483 } 484 485 const u32 *fdtdec_locate_array(const void *blob, int node, 486 const char *prop_name, int count) 487 { 488 const u32 *cell; 489 int err; 490 491 cell = get_prop_check_min_len(blob, node, prop_name, 492 sizeof(u32) * count, &err); 493 return err ? NULL : cell; 494 } 495 496 int fdtdec_get_bool(const void *blob, int node, const char *prop_name) 497 { 498 const s32 *cell; 499 int len; 500 501 debug("%s: %s\n", __func__, prop_name); 502 cell = fdt_getprop(blob, node, prop_name, &len); 503 return cell != NULL; 504 } 505 506 /** 507 * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no 508 * terminating item. 509 * 510 * @param blob FDT blob to use 511 * @param node Node to look at 512 * @param prop_name Node property name 513 * @param gpio Array of gpio elements to fill from FDT. This will be 514 * untouched if either 0 or an error is returned 515 * @param max_count Maximum number of elements allowed 516 * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would 517 * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing. 518 */ 519 int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name, 520 struct fdt_gpio_state *gpio, int max_count) 521 { 522 const struct fdt_property *prop; 523 const u32 *cell; 524 const char *name; 525 int len, i; 526 527 debug("%s: %s\n", __func__, prop_name); 528 assert(max_count > 0); 529 prop = fdt_get_property(blob, node, prop_name, &len); 530 if (!prop) { 531 debug("%s: property '%s' missing\n", __func__, prop_name); 532 return -FDT_ERR_NOTFOUND; 533 } 534 535 /* We will use the name to tag the GPIO */ 536 name = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); 537 cell = (u32 *)prop->data; 538 len /= sizeof(u32) * 3; /* 3 cells per GPIO record */ 539 if (len > max_count) { 540 debug(" %s: too many GPIOs / cells for " 541 "property '%s'\n", __func__, prop_name); 542 return -FDT_ERR_BADLAYOUT; 543 } 544 545 /* Read out the GPIO data from the cells */ 546 for (i = 0; i < len; i++, cell += 3) { 547 gpio[i].gpio = fdt32_to_cpu(cell[1]); 548 gpio[i].flags = fdt32_to_cpu(cell[2]); 549 gpio[i].name = name; 550 } 551 552 return len; 553 } 554 555 int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name, 556 struct fdt_gpio_state *gpio) 557 { 558 int err; 559 560 debug("%s: %s\n", __func__, prop_name); 561 gpio->gpio = FDT_GPIO_NONE; 562 gpio->name = NULL; 563 err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1); 564 return err == 1 ? 0 : err; 565 } 566 567 int fdtdec_get_gpio(struct fdt_gpio_state *gpio) 568 { 569 int val; 570 571 if (!fdt_gpio_isvalid(gpio)) 572 return -1; 573 574 val = gpio_get_value(gpio->gpio); 575 return gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val; 576 } 577 578 int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val) 579 { 580 if (!fdt_gpio_isvalid(gpio)) 581 return -1; 582 583 val = gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val; 584 return gpio_set_value(gpio->gpio, val); 585 } 586 587 int fdtdec_setup_gpio(struct fdt_gpio_state *gpio) 588 { 589 /* 590 * Return success if there is no GPIO defined. This is used for 591 * optional GPIOs) 592 */ 593 if (!fdt_gpio_isvalid(gpio)) 594 return 0; 595 596 if (gpio_request(gpio->gpio, gpio->name)) 597 return -1; 598 return 0; 599 } 600 601 int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name, 602 u8 *array, int count) 603 { 604 const u8 *cell; 605 int err; 606 607 cell = get_prop_check_min_len(blob, node, prop_name, count, &err); 608 if (!err) 609 memcpy(array, cell, count); 610 return err; 611 } 612 613 const u8 *fdtdec_locate_byte_array(const void *blob, int node, 614 const char *prop_name, int count) 615 { 616 const u8 *cell; 617 int err; 618 619 cell = get_prop_check_min_len(blob, node, prop_name, count, &err); 620 if (err) 621 return NULL; 622 return cell; 623 } 624 625 int fdtdec_get_config_int(const void *blob, const char *prop_name, 626 int default_val) 627 { 628 int config_node; 629 630 debug("%s: %s\n", __func__, prop_name); 631 config_node = fdt_path_offset(blob, "/config"); 632 if (config_node < 0) 633 return default_val; 634 return fdtdec_get_int(blob, config_node, prop_name, default_val); 635 } 636 637 int fdtdec_get_config_bool(const void *blob, const char *prop_name) 638 { 639 int config_node; 640 const void *prop; 641 642 debug("%s: %s\n", __func__, prop_name); 643 config_node = fdt_path_offset(blob, "/config"); 644 if (config_node < 0) 645 return 0; 646 prop = fdt_get_property(blob, config_node, prop_name, NULL); 647 648 return prop != NULL; 649 } 650 651 char *fdtdec_get_config_string(const void *blob, const char *prop_name) 652 { 653 const char *nodep; 654 int nodeoffset; 655 int len; 656 657 debug("%s: %s\n", __func__, prop_name); 658 nodeoffset = fdt_path_offset(blob, "/config"); 659 if (nodeoffset < 0) 660 return NULL; 661 662 nodep = fdt_getprop(blob, nodeoffset, prop_name, &len); 663 if (!nodep) 664 return NULL; 665 666 return (char *)nodep; 667 } 668 669 int fdtdec_decode_region(const void *blob, int node, 670 const char *prop_name, void **ptrp, size_t *size) 671 { 672 const fdt_addr_t *cell; 673 int len; 674 675 debug("%s: %s\n", __func__, prop_name); 676 cell = fdt_getprop(blob, node, prop_name, &len); 677 if (!cell || (len != sizeof(fdt_addr_t) * 2)) 678 return -1; 679 680 *ptrp = map_sysmem(fdt_addr_to_cpu(*cell), *size); 681 *size = fdt_size_to_cpu(cell[1]); 682 debug("%s: size=%zx\n", __func__, *size); 683 return 0; 684 } 685 686 /** 687 * Read a flash entry from the fdt 688 * 689 * @param blob FDT blob 690 * @param node Offset of node to read 691 * @param name Name of node being read 692 * @param entry Place to put offset and size of this node 693 * @return 0 if ok, -ve on error 694 */ 695 int fdtdec_read_fmap_entry(const void *blob, int node, const char *name, 696 struct fmap_entry *entry) 697 { 698 u32 reg[2]; 699 700 if (fdtdec_get_int_array(blob, node, "reg", reg, 2)) { 701 debug("Node '%s' has bad/missing 'reg' property\n", name); 702 return -FDT_ERR_NOTFOUND; 703 } 704 entry->offset = reg[0]; 705 entry->length = reg[1]; 706 707 return 0; 708 } 709 #endif 710