lib/fdtdec.c

   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_check_fdt(void)
 384 {
 385         /*
 386          * We must have an FDT, but we cannot panic() yet since the console
 387          * is not ready. So for now, just assert(). Boards which need an early
 388          * FDT (prior to console ready) will need to make their own
 389          * arrangements and do their own checks.
 390          */
 391         assert(!fdtdec_prepare_fdt());
 392         return 0;
 393 }
 394
 395 /*
 396  * This function is a little odd in that it accesses global data. At some
 397  * point if the architecture board.c files merge this will make more sense.
 398  * Even now, it is common code.
 399  */
 400 int fdtdec_prepare_fdt(void)
 401 {
 402         if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) ||
 403             fdt_check_header(gd->fdt_blob)) {
 404                 printf("No valid FDT found - please append one to U-Boot "
 405                         "binary, use u-boot-dtb.bin or define "
 406                         "CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>\n");
 407                 return -1;
 408         }
 409         return 0;
 410 }
 411
 412 int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name)
 413 {
 414         const u32 *phandle;
 415         int lookup;
 416
 417         debug("%s: %s\n", __func__, prop_name);
 418         phandle = fdt_getprop(blob, node, prop_name, NULL);
 419         if (!phandle)
 420                 return -FDT_ERR_NOTFOUND;
 421
 422         lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle));
 423         return lookup;
 424 }
 425
 426 /**
 427  * Look up a property in a node and check that it has a minimum length.
 428  *
 429  * @param blob          FDT blob
 430  * @param node          node to examine
 431  * @param prop_name     name of property to find
 432  * @param min_len       minimum property length in bytes
 433  * @param err           0 if ok, or -FDT_ERR_NOTFOUND if the property is not
 434                         found, or -FDT_ERR_BADLAYOUT if not enough data
 435  * @return pointer to cell, which is only valid if err == 0
 436  */
 437 static const void *get_prop_check_min_len(const void *blob, int node,
 438                 const char *prop_name, int min_len, int *err)
 439 {
 440         const void *cell;
 441         int len;
 442
 443         debug("%s: %s\n", __func__, prop_name);
 444         cell = fdt_getprop(blob, node, prop_name, &len);
 445         if (!cell)
 446                 *err = -FDT_ERR_NOTFOUND;
 447         else if (len < min_len)
 448                 *err = -FDT_ERR_BADLAYOUT;
 449         else
 450                 *err = 0;
 451         return cell;
 452 }
 453
 454 int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
 455                 u32 *array, int count)
 456 {
 457         const u32 *cell;
 458         int i, err = 0;
 459
 460         debug("%s: %s\n", __func__, prop_name);
 461         cell = get_prop_check_min_len(blob, node, prop_name,
 462                                       sizeof(u32) * count, &err);
 463         if (!err) {
 464                 for (i = 0; i < count; i++)
 465                         array[i] = fdt32_to_cpu(cell[i]);
 466         }
 467         return err;
 468 }
 469
 470 const u32 *fdtdec_locate_array(const void *blob, int node,
 471                                const char *prop_name, int count)
 472 {
 473         const u32 *cell;
 474         int err;
 475
 476         cell = get_prop_check_min_len(blob, node, prop_name,
 477                                       sizeof(u32) * count, &err);
 478         return err ? NULL : cell;
 479 }
 480
 481 int fdtdec_get_bool(const void *blob, int node, const char *prop_name)
 482 {
 483         const s32 *cell;
 484         int len;
 485
 486         debug("%s: %s\n", __func__, prop_name);
 487         cell = fdt_getprop(blob, node, prop_name, &len);
 488         return cell != NULL;
 489 }
 490
 491 /**
 492  * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no
 493  * terminating item.
 494  *
 495  * @param blob          FDT blob to use
 496  * @param node          Node to look at
 497  * @param prop_name     Node property name
 498  * @param gpio          Array of gpio elements to fill from FDT. This will be
 499  *                      untouched if either 0 or an error is returned
 500  * @param max_count     Maximum number of elements allowed
 501  * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would
 502  * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing.
 503  */
 504 int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name,
 505                 struct fdt_gpio_state *gpio, int max_count)
 506 {
 507         const struct fdt_property *prop;
 508         const u32 *cell;
 509         const char *name;
 510         int len, i;
 511
 512         debug("%s: %s\n", __func__, prop_name);
 513         assert(max_count > 0);
 514         prop = fdt_get_property(blob, node, prop_name, &len);
 515         if (!prop) {
 516                 debug("%s: property '%s' missing\n", __func__, prop_name);
 517                 return -FDT_ERR_NOTFOUND;
 518         }
 519
 520         /* We will use the name to tag the GPIO */
 521         name = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
 522         cell = (u32 *)prop->data;
 523         len /= sizeof(u32) * 3;         /* 3 cells per GPIO record */
 524         if (len > max_count) {
 525                 debug(" %s: too many GPIOs / cells for "
 526                         "property '%s'\n", __func__, prop_name);
 527                 return -FDT_ERR_BADLAYOUT;
 528         }
 529
 530         /* Read out the GPIO data from the cells */
 531         for (i = 0; i < len; i++, cell += 3) {
 532                 gpio[i].gpio = fdt32_to_cpu(cell[1]);
 533                 gpio[i].flags = fdt32_to_cpu(cell[2]);
 534                 gpio[i].name = name;
 535         }
 536
 537         return len;
 538 }
 539
 540 int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name,
 541                 struct fdt_gpio_state *gpio)
 542 {
 543         int err;
 544
 545         debug("%s: %s\n", __func__, prop_name);
 546         gpio->gpio = FDT_GPIO_NONE;
 547         gpio->name = NULL;
 548         err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1);
 549         return err == 1 ? 0 : err;
 550 }
 551
 552 int fdtdec_get_gpio(struct fdt_gpio_state *gpio)
 553 {
 554         int val;
 555
 556         if (!fdt_gpio_isvalid(gpio))
 557                 return -1;
 558
 559         val = gpio_get_value(gpio->gpio);
 560         return gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val;
 561 }
 562
 563 int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val)
 564 {
 565         if (!fdt_gpio_isvalid(gpio))
 566                 return -1;
 567
 568         val = gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val;
 569         return gpio_set_value(gpio->gpio, val);
 570 }
 571
 572 int fdtdec_setup_gpio(struct fdt_gpio_state *gpio)
 573 {
 574         /*
 575          * Return success if there is no GPIO defined. This is used for
 576          * optional GPIOs)
 577          */
 578         if (!fdt_gpio_isvalid(gpio))
 579                 return 0;
 580
 581         if (gpio_request(gpio->gpio, gpio->name))
 582                 return -1;
 583         return 0;
 584 }
 585
 586 int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
 587                 u8 *array, int count)
 588 {
 589         const u8 *cell;
 590         int err;
 591
 592         cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
 593         if (!err)
 594                 memcpy(array, cell, count);
 595         return err;
 596 }
 597
 598 const u8 *fdtdec_locate_byte_array(const void *blob, int node,
 599                              const char *prop_name, int count)
 600 {
 601         const u8 *cell;
 602         int err;
 603
 604         cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
 605         if (err)
 606                 return NULL;
 607         return cell;
 608 }
 609
 610 int fdtdec_get_config_int(const void *blob, const char *prop_name,
 611                 int default_val)
 612 {
 613         int config_node;
 614
 615         debug("%s: %s\n", __func__, prop_name);
 616         config_node = fdt_path_offset(blob, "/config");
 617         if (config_node < 0)
 618                 return default_val;
 619         return fdtdec_get_int(blob, config_node, prop_name, default_val);
 620 }
 621
 622 int fdtdec_get_config_bool(const void *blob, const char *prop_name)
 623 {
 624         int config_node;
 625         const void *prop;
 626
 627         debug("%s: %s\n", __func__, prop_name);
 628         config_node = fdt_path_offset(blob, "/config");
 629         if (config_node < 0)
 630                 return 0;
 631         prop = fdt_get_property(blob, config_node, prop_name, NULL);
 632
 633         return prop != NULL;
 634 }
 635
 636 char *fdtdec_get_config_string(const void *blob, const char *prop_name)
 637 {
 638         const char *nodep;
 639         int nodeoffset;
 640         int len;
 641
 642         debug("%s: %s\n", __func__, prop_name);
 643         nodeoffset = fdt_path_offset(blob, "/config");
 644         if (nodeoffset < 0)
 645                 return NULL;
 646
 647         nodep = fdt_getprop(blob, nodeoffset, prop_name, &len);
 648         if (!nodep)
 649                 return NULL;
 650
 651         return (char *)nodep;
 652 }
 653
 654 int fdtdec_decode_region(const void *blob, int node,
 655                 const char *prop_name, void **ptrp, size_t *size)
 656 {
 657         const fdt_addr_t *cell;
 658         int len;
 659
 660         debug("%s: %s\n", __func__, prop_name);
 661         cell = fdt_getprop(blob, node, prop_name, &len);
 662         if (!cell || (len != sizeof(fdt_addr_t) * 2))
 663                 return -1;
 664
 665         *ptrp = map_sysmem(fdt_addr_to_cpu(*cell), *size);
 666         *size = fdt_size_to_cpu(cell[1]);
 667         debug("%s: size=%zx\n", __func__, *size);
 668         return 0;
 669 }
 670
 671 /**
 672  * Read a flash entry from the fdt
 673  *
 674  * @param blob          FDT blob
 675  * @param node          Offset of node to read
 676  * @param name          Name of node being read
 677  * @param entry         Place to put offset and size of this node
 678  * @return 0 if ok, -ve on error
 679  */
 680 int fdtdec_read_fmap_entry(const void *blob, int node, const char *name,
 681                            struct fmap_entry *entry)
 682 {
 683         u32 reg[2];
 684
 685         if (fdtdec_get_int_array(blob, node, "reg", reg, 2)) {
 686                 debug("Node '%s' has bad/missing 'reg' property\n", name);
 687                 return -FDT_ERR_NOTFOUND;
 688         }
 689         entry->offset = reg[0];
 690         entry->length = reg[1];
 691
 692         return 0;
 693 }
 694 #endif