lib/fdtdec.c

   1 /*
   2  * Copyright (c) 2011 The Chromium OS Authors.
   3  * SPDX-License-Identifier:     GPL-2.0+
   4  */
   5
   6 #include <common.h>
   7 #include <serial.h>
   8 #include <libfdt.h>
   9 #include <fdtdec.h>
  10
  11 #include <asm/gpio.h>
  12
  13 DECLARE_GLOBAL_DATA_PTR;
  14
  15 /*
  16  * Here are the type we know about. One day we might allow drivers to
  17  * register. For now we just put them here. The COMPAT macro allows us to
  18  * turn this into a sparse list later, and keeps the ID with the name.
  19  */
  20 #define COMPAT(id, name) name
  21 static const char * const compat_names[COMPAT_COUNT] = {
  22         COMPAT(UNKNOWN, "<none>"),
  23         COMPAT(NVIDIA_TEGRA20_USB, "nvidia,tegra20-ehci"),
  24         COMPAT(NVIDIA_TEGRA30_USB, "nvidia,tegra30-ehci"),
  25         COMPAT(NVIDIA_TEGRA114_USB, "nvidia,tegra114-ehci"),
  26         COMPAT(NVIDIA_TEGRA114_I2C, "nvidia,tegra114-i2c"),
  27         COMPAT(NVIDIA_TEGRA20_I2C, "nvidia,tegra20-i2c"),
  28         COMPAT(NVIDIA_TEGRA20_DVC, "nvidia,tegra20-i2c-dvc"),
  29         COMPAT(NVIDIA_TEGRA20_EMC, "nvidia,tegra20-emc"),
  30         COMPAT(NVIDIA_TEGRA20_EMC_TABLE, "nvidia,tegra20-emc-table"),
  31         COMPAT(NVIDIA_TEGRA20_KBC, "nvidia,tegra20-kbc"),
  32         COMPAT(NVIDIA_TEGRA20_NAND, "nvidia,tegra20-nand"),
  33         COMPAT(NVIDIA_TEGRA20_PWM, "nvidia,tegra20-pwm"),
  34         COMPAT(NVIDIA_TEGRA20_DC, "nvidia,tegra20-dc"),
  35         COMPAT(NVIDIA_TEGRA124_SDMMC, "nvidia,tegra124-sdhci"),
  36         COMPAT(NVIDIA_TEGRA30_SDMMC, "nvidia,tegra30-sdhci"),
  37         COMPAT(NVIDIA_TEGRA20_SDMMC, "nvidia,tegra20-sdhci"),
  38         COMPAT(NVIDIA_TEGRA20_SFLASH, "nvidia,tegra20-sflash"),
  39         COMPAT(NVIDIA_TEGRA20_SLINK, "nvidia,tegra20-slink"),
  40         COMPAT(NVIDIA_TEGRA114_SPI, "nvidia,tegra114-spi"),
  41         COMPAT(SMSC_LAN9215, "smsc,lan9215"),
  42         COMPAT(SAMSUNG_EXYNOS5_SROMC, "samsung,exynos-sromc"),
  43         COMPAT(SAMSUNG_S3C2440_I2C, "samsung,s3c2440-i2c"),
  44         COMPAT(SAMSUNG_EXYNOS5_SOUND, "samsung,exynos-sound"),
  45         COMPAT(WOLFSON_WM8994_CODEC, "wolfson,wm8994-codec"),
  46         COMPAT(SAMSUNG_EXYNOS_SPI, "samsung,exynos-spi"),
  47         COMPAT(GOOGLE_CROS_EC, "google,cros-ec"),
  48         COMPAT(GOOGLE_CROS_EC_KEYB, "google,cros-ec-keyb"),
  49         COMPAT(SAMSUNG_EXYNOS_EHCI, "samsung,exynos-ehci"),
  50         COMPAT(SAMSUNG_EXYNOS5_XHCI, "samsung,exynos5250-xhci"),
  51         COMPAT(SAMSUNG_EXYNOS_USB_PHY, "samsung,exynos-usb-phy"),
  52         COMPAT(SAMSUNG_EXYNOS5_USB3_PHY, "samsung,exynos5250-usb3-phy"),
  53         COMPAT(SAMSUNG_EXYNOS_TMU, "samsung,exynos-tmu"),
  54         COMPAT(SAMSUNG_EXYNOS_FIMD, "samsung,exynos-fimd"),
  55         COMPAT(SAMSUNG_EXYNOS5_DP, "samsung,exynos5-dp"),
  56         COMPAT(SAMSUNG_EXYNOS5_DWMMC, "samsung,exynos5250-dwmmc"),
  57         COMPAT(SAMSUNG_EXYNOS_SERIAL, "samsung,exynos4210-uart"),
  58         COMPAT(MAXIM_MAX77686_PMIC, "maxim,max77686_pmic"),
  59         COMPAT(GENERIC_SPI_FLASH, "spi-flash"),
  60         COMPAT(MAXIM_98095_CODEC, "maxim,max98095-codec"),
  61         COMPAT(INFINEON_SLB9635_TPM, "infineon,slb9635-tpm"),
  62         COMPAT(INFINEON_SLB9645_TPM, "infineon,slb9645-tpm"),
  63         COMPAT(SAMSUNG_EXYNOS5_I2C, "samsung,exynos5-hsi2c"),
  64 };
  65
  66 const char *fdtdec_get_compatible(enum fdt_compat_id id)
  67 {
  68         /* We allow reading of the 'unknown' ID for testing purposes */
  69         assert(id >= 0 && id < COMPAT_COUNT);
  70         return compat_names[id];
  71 }
  72
  73 fdt_addr_t fdtdec_get_addr_size(const void *blob, int node,
  74                 const char *prop_name, fdt_size_t *sizep)
  75 {
  76         const fdt_addr_t *cell;
  77         int len;
  78
  79         debug("%s: %s: ", __func__, prop_name);
  80         cell = fdt_getprop(blob, node, prop_name, &len);
  81         if (cell && ((!sizep && len == sizeof(fdt_addr_t)) ||
  82                      len == sizeof(fdt_addr_t) * 2)) {
  83                 fdt_addr_t addr = fdt_addr_to_cpu(*cell);
  84                 if (sizep) {
  85                         const fdt_size_t *size;
  86
  87                         size = (fdt_size_t *)((char *)cell +
  88                                         sizeof(fdt_addr_t));
  89                         *sizep = fdt_size_to_cpu(*size);
  90                         debug("addr=%08lx, size=%08x\n",
  91                               (ulong)addr, *sizep);
  92                 } else {
  93                         debug("%08lx\n", (ulong)addr);
  94                 }
  95                 return addr;
  96         }
  97         debug("(not found)\n");
  98         return FDT_ADDR_T_NONE;
  99 }
 100
 101 fdt_addr_t fdtdec_get_addr(const void *blob, int node,
 102                 const char *prop_name)
 103 {
 104         return fdtdec_get_addr_size(blob, node, prop_name, NULL);
 105 }
 106
 107 s32 fdtdec_get_int(const void *blob, int node, const char *prop_name,
 108                 s32 default_val)
 109 {
 110         const s32 *cell;
 111         int len;
 112
 113         debug("%s: %s: ", __func__, prop_name);
 114         cell = fdt_getprop(blob, node, prop_name, &len);
 115         if (cell && len >= sizeof(s32)) {
 116                 s32 val = fdt32_to_cpu(cell[0]);
 117
 118                 debug("%#x (%d)\n", val, val);
 119                 return val;
 120         }
 121         debug("(not found)\n");
 122         return default_val;
 123 }
 124
 125 uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
 126                 uint64_t default_val)
 127 {
 128         const uint64_t *cell64;
 129         int length;
 130
 131         cell64 = fdt_getprop(blob, node, prop_name, &length);
 132         if (!cell64 || length < sizeof(*cell64))
 133                 return default_val;
 134
 135         return fdt64_to_cpu(*cell64);
 136 }
 137
 138 int fdtdec_get_is_enabled(const void *blob, int node)
 139 {
 140         const char *cell;
 141
 142         /*
 143          * It should say "okay", so only allow that. Some fdts use "ok" but
 144          * this is a bug. Please fix your device tree source file. See here
 145          * for discussion:
 146          *
 147          * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html
 148          */
 149         cell = fdt_getprop(blob, node, "status", NULL);
 150         if (cell)
 151                 return 0 == strcmp(cell, "okay");
 152         return 1;
 153 }
 154
 155 enum fdt_compat_id fdtdec_lookup(const void *blob, int node)
 156 {
 157         enum fdt_compat_id id;
 158
 159         /* Search our drivers */
 160         for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++)
 161                 if (0 == fdt_node_check_compatible(blob, node,
 162                                 compat_names[id]))
 163                         return id;
 164         return COMPAT_UNKNOWN;
 165 }
 166
 167 int fdtdec_next_compatible(const void *blob, int node,
 168                 enum fdt_compat_id id)
 169 {
 170         return fdt_node_offset_by_compatible(blob, node, compat_names[id]);
 171 }
 172
 173 int fdtdec_next_compatible_subnode(const void *blob, int node,
 174                 enum fdt_compat_id id, int *depthp)
 175 {
 176         do {
 177                 node = fdt_next_node(blob, node, depthp);
 178         } while (*depthp > 1);
 179
 180         /* If this is a direct subnode, and compatible, return it */
 181         if (*depthp == 1 && 0 == fdt_node_check_compatible(
 182                                                 blob, node, compat_names[id]))
 183                 return node;
 184
 185         return -FDT_ERR_NOTFOUND;
 186 }
 187
 188 int fdtdec_next_alias(const void *blob, const char *name,
 189                 enum fdt_compat_id id, int *upto)
 190 {
 191 #define MAX_STR_LEN 20
 192         char str[MAX_STR_LEN + 20];
 193         int node, err;
 194
 195         /* snprintf() is not available */
 196         assert(strlen(name) < MAX_STR_LEN);
 197         sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto);
 198         node = fdt_path_offset(blob, str);
 199         if (node < 0)
 200                 return node;
 201         err = fdt_node_check_compatible(blob, node, compat_names[id]);
 202         if (err < 0)
 203                 return err;
 204         if (err)
 205                 return -FDT_ERR_NOTFOUND;
 206         (*upto)++;
 207         return node;
 208 }
 209
 210 int fdtdec_find_aliases_for_id(const void *blob, const char *name,
 211                         enum fdt_compat_id id, int *node_list, int maxcount)
 212 {
 213         memset(node_list, '\0', sizeof(*node_list) * maxcount);
 214
 215         return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount);
 216 }
 217
 218 /* TODO: Can we tighten this code up a little? */
 219 int fdtdec_add_aliases_for_id(const void *blob, const char *name,
 220                         enum fdt_compat_id id, int *node_list, int maxcount)
 221 {
 222         int name_len = strlen(name);
 223         int nodes[maxcount];
 224         int num_found = 0;
 225         int offset, node;
 226         int alias_node;
 227         int count;
 228         int i, j;
 229
 230         /* find the alias node if present */
 231         alias_node = fdt_path_offset(blob, "/aliases");
 232
 233         /*
 234          * start with nothing, and we can assume that the root node can't
 235          * match
 236          */
 237         memset(nodes, '\0', sizeof(nodes));
 238
 239         /* First find all the compatible nodes */
 240         for (node = count = 0; node >= 0 && count < maxcount;) {
 241                 node = fdtdec_next_compatible(blob, node, id);
 242                 if (node >= 0)
 243                         nodes[count++] = node;
 244         }
 245         if (node >= 0)
 246                 debug("%s: warning: maxcount exceeded with alias '%s'\n",
 247                        __func__, name);
 248
 249         /* Now find all the aliases */
 250         for (offset = fdt_first_property_offset(blob, alias_node);
 251                         offset > 0;
 252                         offset = fdt_next_property_offset(blob, offset)) {
 253                 const struct fdt_property *prop;
 254                 const char *path;
 255                 int number;
 256                 int found;
 257
 258                 node = 0;
 259                 prop = fdt_get_property_by_offset(blob, offset, NULL);
 260                 path = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
 261                 if (prop->len && 0 == strncmp(path, name, name_len))
 262                         node = fdt_path_offset(blob, prop->data);
 263                 if (node <= 0)
 264                         continue;
 265
 266                 /* Get the alias number */
 267                 number = simple_strtoul(path + name_len, NULL, 10);
 268                 if (number < 0 || number >= maxcount) {
 269                         debug("%s: warning: alias '%s' is out of range\n",
 270                                __func__, path);
 271                         continue;
 272                 }
 273
 274                 /* Make sure the node we found is actually in our list! */
 275                 found = -1;
 276                 for (j = 0; j < count; j++)
 277                         if (nodes[j] == node) {
 278                                 found = j;
 279                                 break;
 280                         }
 281
 282                 if (found == -1) {
 283                         debug("%s: warning: alias '%s' points to a node "
 284                                 "'%s' that is missing or is not compatible "
 285                                 " with '%s'\n", __func__, path,
 286                                 fdt_get_name(blob, node, NULL),
 287                                compat_names[id]);
 288                         continue;
 289                 }
 290
 291                 /*
 292                  * Add this node to our list in the right place, and mark
 293                  * it as done.
 294                  */
 295                 if (fdtdec_get_is_enabled(blob, node)) {
 296                         if (node_list[number]) {
 297                                 debug("%s: warning: alias '%s' requires that "
 298                                       "a node be placed in the list in a "
 299                                       "position which is already filled by "
 300                                       "node '%s'\n", __func__, path,
 301                                       fdt_get_name(blob, node, NULL));
 302                                 continue;
 303                         }
 304                         node_list[number] = node;
 305                         if (number >= num_found)
 306                                 num_found = number + 1;
 307                 }
 308                 nodes[found] = 0;
 309         }
 310
 311         /* Add any nodes not mentioned by an alias */
 312         for (i = j = 0; i < maxcount; i++) {
 313                 if (!node_list[i]) {
 314                         for (; j < maxcount; j++)
 315                                 if (nodes[j] &&
 316                                         fdtdec_get_is_enabled(blob, nodes[j]))
 317                                         break;
 318
 319                         /* Have we run out of nodes to add? */
 320                         if (j == maxcount)
 321                                 break;
 322
 323                         assert(!node_list[i]);
 324                         node_list[i] = nodes[j++];
 325                         if (i >= num_found)
 326                                 num_found = i + 1;
 327                 }
 328         }
 329
 330         return num_found;
 331 }
 332
 333 int fdtdec_check_fdt(void)
 334 {
 335         /*
 336          * We must have an FDT, but we cannot panic() yet since the console
 337          * is not ready. So for now, just assert(). Boards which need an early
 338          * FDT (prior to console ready) will need to make their own
 339          * arrangements and do their own checks.
 340          */
 341         assert(!fdtdec_prepare_fdt());
 342         return 0;
 343 }
 344
 345 /*
 346  * This function is a little odd in that it accesses global data. At some
 347  * point if the architecture board.c files merge this will make more sense.
 348  * Even now, it is common code.
 349  */
 350 int fdtdec_prepare_fdt(void)
 351 {
 352         if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) ||
 353             fdt_check_header(gd->fdt_blob)) {
 354                 printf("No valid FDT found - please append one to U-Boot "
 355                         "binary, use u-boot-dtb.bin or define "
 356                         "CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>\n");
 357                 return -1;
 358         }
 359         return 0;
 360 }
 361
 362 int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name)
 363 {
 364         const u32 *phandle;
 365         int lookup;
 366
 367         debug("%s: %s\n", __func__, prop_name);
 368         phandle = fdt_getprop(blob, node, prop_name, NULL);
 369         if (!phandle)
 370                 return -FDT_ERR_NOTFOUND;
 371
 372         lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle));
 373         return lookup;
 374 }
 375
 376 /**
 377  * Look up a property in a node and check that it has a minimum length.
 378  *
 379  * @param blob          FDT blob
 380  * @param node          node to examine
 381  * @param prop_name     name of property to find
 382  * @param min_len       minimum property length in bytes
 383  * @param err           0 if ok, or -FDT_ERR_NOTFOUND if the property is not
 384                         found, or -FDT_ERR_BADLAYOUT if not enough data
 385  * @return pointer to cell, which is only valid if err == 0
 386  */
 387 static const void *get_prop_check_min_len(const void *blob, int node,
 388                 const char *prop_name, int min_len, int *err)
 389 {
 390         const void *cell;
 391         int len;
 392
 393         debug("%s: %s\n", __func__, prop_name);
 394         cell = fdt_getprop(blob, node, prop_name, &len);
 395         if (!cell)
 396                 *err = -FDT_ERR_NOTFOUND;
 397         else if (len < min_len)
 398                 *err = -FDT_ERR_BADLAYOUT;
 399         else
 400                 *err = 0;
 401         return cell;
 402 }
 403
 404 int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
 405                 u32 *array, int count)
 406 {
 407         const u32 *cell;
 408         int i, err = 0;
 409
 410         debug("%s: %s\n", __func__, prop_name);
 411         cell = get_prop_check_min_len(blob, node, prop_name,
 412                                       sizeof(u32) * count, &err);
 413         if (!err) {
 414                 for (i = 0; i < count; i++)
 415                         array[i] = fdt32_to_cpu(cell[i]);
 416         }
 417         return err;
 418 }
 419
 420 const u32 *fdtdec_locate_array(const void *blob, int node,
 421                                const char *prop_name, int count)
 422 {
 423         const u32 *cell;
 424         int err;
 425
 426         cell = get_prop_check_min_len(blob, node, prop_name,
 427                                       sizeof(u32) * count, &err);
 428         return err ? NULL : cell;
 429 }
 430
 431 int fdtdec_get_bool(const void *blob, int node, const char *prop_name)
 432 {
 433         const s32 *cell;
 434         int len;
 435
 436         debug("%s: %s\n", __func__, prop_name);
 437         cell = fdt_getprop(blob, node, prop_name, &len);
 438         return cell != NULL;
 439 }
 440
 441 /**
 442  * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no
 443  * terminating item.
 444  *
 445  * @param blob          FDT blob to use
 446  * @param node          Node to look at
 447  * @param prop_name     Node property name
 448  * @param gpio          Array of gpio elements to fill from FDT. This will be
 449  *                      untouched if either 0 or an error is returned
 450  * @param max_count     Maximum number of elements allowed
 451  * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would
 452  * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing.
 453  */
 454 int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name,
 455                 struct fdt_gpio_state *gpio, int max_count)
 456 {
 457         const struct fdt_property *prop;
 458         const u32 *cell;
 459         const char *name;
 460         int len, i;
 461
 462         debug("%s: %s\n", __func__, prop_name);
 463         assert(max_count > 0);
 464         prop = fdt_get_property(blob, node, prop_name, &len);
 465         if (!prop) {
 466                 debug("%s: property '%s' missing\n", __func__, prop_name);
 467                 return -FDT_ERR_NOTFOUND;
 468         }
 469
 470         /* We will use the name to tag the GPIO */
 471         name = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
 472         cell = (u32 *)prop->data;
 473         len /= sizeof(u32) * 3;         /* 3 cells per GPIO record */
 474         if (len > max_count) {
 475                 debug(" %s: too many GPIOs / cells for "
 476                         "property '%s'\n", __func__, prop_name);
 477                 return -FDT_ERR_BADLAYOUT;
 478         }
 479
 480         /* Read out the GPIO data from the cells */
 481         for (i = 0; i < len; i++, cell += 3) {
 482                 gpio[i].gpio = fdt32_to_cpu(cell[1]);
 483                 gpio[i].flags = fdt32_to_cpu(cell[2]);
 484                 gpio[i].name = name;
 485         }
 486
 487         return len;
 488 }
 489
 490 int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name,
 491                 struct fdt_gpio_state *gpio)
 492 {
 493         int err;
 494
 495         debug("%s: %s\n", __func__, prop_name);
 496         gpio->gpio = FDT_GPIO_NONE;
 497         gpio->name = NULL;
 498         err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1);
 499         return err == 1 ? 0 : err;
 500 }
 501
 502 int fdtdec_get_gpio(struct fdt_gpio_state *gpio)
 503 {
 504         int val;
 505
 506         if (!fdt_gpio_isvalid(gpio))
 507                 return -1;
 508
 509         val = gpio_get_value(gpio->gpio);
 510         return gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val;
 511 }
 512
 513 int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val)
 514 {
 515         if (!fdt_gpio_isvalid(gpio))
 516                 return -1;
 517
 518         val = gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val;
 519         return gpio_set_value(gpio->gpio, val);
 520 }
 521
 522 int fdtdec_setup_gpio(struct fdt_gpio_state *gpio)
 523 {
 524         /*
 525          * Return success if there is no GPIO defined. This is used for
 526          * optional GPIOs)
 527          */
 528         if (!fdt_gpio_isvalid(gpio))
 529                 return 0;
 530
 531         if (gpio_request(gpio->gpio, gpio->name))
 532                 return -1;
 533         return 0;
 534 }
 535
 536 int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
 537                 u8 *array, int count)
 538 {
 539         const u8 *cell;
 540         int err;
 541
 542         cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
 543         if (!err)
 544                 memcpy(array, cell, count);
 545         return err;
 546 }
 547
 548 const u8 *fdtdec_locate_byte_array(const void *blob, int node,
 549                              const char *prop_name, int count)
 550 {
 551         const u8 *cell;
 552         int err;
 553
 554         cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
 555         if (err)
 556                 return NULL;
 557         return cell;
 558 }
 559
 560 int fdtdec_get_config_int(const void *blob, const char *prop_name,
 561                 int default_val)
 562 {
 563         int config_node;
 564
 565         debug("%s: %s\n", __func__, prop_name);
 566         config_node = fdt_path_offset(blob, "/config");
 567         if (config_node < 0)
 568                 return default_val;
 569         return fdtdec_get_int(blob, config_node, prop_name, default_val);
 570 }
 571
 572 int fdtdec_get_config_bool(const void *blob, const char *prop_name)
 573 {
 574         int config_node;
 575         const void *prop;
 576
 577         debug("%s: %s\n", __func__, prop_name);
 578         config_node = fdt_path_offset(blob, "/config");
 579         if (config_node < 0)
 580                 return 0;
 581         prop = fdt_get_property(blob, config_node, prop_name, NULL);
 582
 583         return prop != NULL;
 584 }
 585
 586 char *fdtdec_get_config_string(const void *blob, const char *prop_name)
 587 {
 588         const char *nodep;
 589         int nodeoffset;
 590         int len;
 591
 592         debug("%s: %s\n", __func__, prop_name);
 593         nodeoffset = fdt_path_offset(blob, "/config");
 594         if (nodeoffset < 0)
 595                 return NULL;
 596
 597         nodep = fdt_getprop(blob, nodeoffset, prop_name, &len);
 598         if (!nodep)
 599                 return NULL;
 600
 601         return (char *)nodep;
 602 }
 603
 604 int fdtdec_decode_region(const void *blob, int node,
 605                 const char *prop_name, void **ptrp, size_t *size)
 606 {
 607         const fdt_addr_t *cell;
 608         int len;
 609
 610         debug("%s: %s\n", __func__, prop_name);
 611         cell = fdt_getprop(blob, node, prop_name, &len);
 612         if (!cell || (len != sizeof(fdt_addr_t) * 2))
 613                 return -1;
 614
 615         *ptrp = map_sysmem(fdt_addr_to_cpu(*cell), *size);
 616         *size = fdt_size_to_cpu(cell[1]);
 617         debug("%s: size=%zx\n", __func__, *size);
 618         return 0;
 619 }