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