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(NVIDIA_TEGRA124_PCIE, "nvidia,tegra124-pcie"),
  45         COMPAT(NVIDIA_TEGRA30_PCIE, "nvidia,tegra30-pcie"),
  46         COMPAT(NVIDIA_TEGRA20_PCIE, "nvidia,tegra20-pcie"),
  47         COMPAT(NVIDIA_TEGRA124_XUSB_PADCTL, "nvidia,tegra124-xusb-padctl"),
  48         COMPAT(SMSC_LAN9215, "smsc,lan9215"),
  49         COMPAT(SAMSUNG_EXYNOS5_SROMC, "samsung,exynos-sromc"),
  50         COMPAT(SAMSUNG_S3C2440_I2C, "samsung,s3c2440-i2c"),
  51         COMPAT(SAMSUNG_EXYNOS5_SOUND, "samsung,exynos-sound"),
  52         COMPAT(WOLFSON_WM8994_CODEC, "wolfson,wm8994-codec"),
  53         COMPAT(SAMSUNG_EXYNOS_SPI, "samsung,exynos-spi"),
  54         COMPAT(GOOGLE_CROS_EC, "google,cros-ec"),
  55         COMPAT(GOOGLE_CROS_EC_KEYB, "google,cros-ec-keyb"),
  56         COMPAT(SAMSUNG_EXYNOS_EHCI, "samsung,exynos-ehci"),
  57         COMPAT(SAMSUNG_EXYNOS5_XHCI, "samsung,exynos5250-xhci"),
  58         COMPAT(SAMSUNG_EXYNOS_USB_PHY, "samsung,exynos-usb-phy"),
  59         COMPAT(SAMSUNG_EXYNOS5_USB3_PHY, "samsung,exynos5250-usb3-phy"),
  60         COMPAT(SAMSUNG_EXYNOS_TMU, "samsung,exynos-tmu"),
  61         COMPAT(SAMSUNG_EXYNOS_FIMD, "samsung,exynos-fimd"),
  62         COMPAT(SAMSUNG_EXYNOS_MIPI_DSI, "samsung,exynos-mipi-dsi"),
  63         COMPAT(SAMSUNG_EXYNOS5_DP, "samsung,exynos5-dp"),
  64         COMPAT(SAMSUNG_EXYNOS_DWMMC, "samsung,exynos-dwmmc"),
  65         COMPAT(SAMSUNG_EXYNOS_MMC, "samsung,exynos-mmc"),
  66         COMPAT(SAMSUNG_EXYNOS_SERIAL, "samsung,exynos4210-uart"),
  67         COMPAT(MAXIM_MAX77686_PMIC, "maxim,max77686_pmic"),
  68         COMPAT(GENERIC_SPI_FLASH, "spi-flash"),
  69         COMPAT(MAXIM_98095_CODEC, "maxim,max98095-codec"),
  70         COMPAT(INFINEON_SLB9635_TPM, "infineon,slb9635-tpm"),
  71         COMPAT(INFINEON_SLB9645_TPM, "infineon,slb9645-tpm"),
  72         COMPAT(SAMSUNG_EXYNOS5_I2C, "samsung,exynos5-hsi2c"),
  73         COMPAT(SANDBOX_HOST_EMULATION, "sandbox,host-emulation"),
  74         COMPAT(SANDBOX_LCD_SDL, "sandbox,lcd-sdl"),
  75         COMPAT(TI_TPS65090, "ti,tps65090"),
  76         COMPAT(COMPAT_NXP_PTN3460, "nxp,ptn3460"),
  77         COMPAT(SAMSUNG_EXYNOS_SYSMMU, "samsung,sysmmu-v3.3"),
  78         COMPAT(PARADE_PS8625, "parade,ps8625"),
  79         COMPAT(COMPAT_INTEL_LPC, "intel,lpc"),
  80         COMPAT(INTEL_MICROCODE, "intel,microcode"),
  81         COMPAT(MEMORY_SPD, "memory-spd"),
  82         COMPAT(INTEL_PANTHERPOINT_AHCI, "intel,pantherpoint-ahci"),
  83         COMPAT(INTEL_MODEL_206AX, "intel,model-206ax"),
  84         COMPAT(INTEL_GMA, "intel,gma"),
  85         COMPAT(AMS_AS3722, "ams,as3722"),
  86 };
  87
  88 const char *fdtdec_get_compatible(enum fdt_compat_id id)
  89 {
  90         /* We allow reading of the 'unknown' ID for testing purposes */
  91         assert(id >= 0 && id < COMPAT_COUNT);
  92         return compat_names[id];
  93 }
  94
  95 fdt_addr_t fdtdec_get_addr_size(const void *blob, int node,
  96                 const char *prop_name, fdt_size_t *sizep)
  97 {
  98         const fdt_addr_t *cell;
  99         int len;
 100
 101         debug("%s: %s: ", __func__, prop_name);
 102         cell = fdt_getprop(blob, node, prop_name, &len);
 103         if (cell && ((!sizep && len == sizeof(fdt_addr_t)) ||
 104                      len == sizeof(fdt_addr_t) * 2)) {
 105                 fdt_addr_t addr = fdt_addr_to_cpu(*cell);
 106                 if (sizep) {
 107                         const fdt_size_t *size;
 108
 109                         size = (fdt_size_t *)((char *)cell +
 110                                         sizeof(fdt_addr_t));
 111                         *sizep = fdt_size_to_cpu(*size);
 112                         debug("addr=%08lx, size=%08x\n",
 113                               (ulong)addr, *sizep);
 114                 } else {
 115                         debug("%08lx\n", (ulong)addr);
 116                 }
 117                 return addr;
 118         }
 119         debug("(not found)\n");
 120         return FDT_ADDR_T_NONE;
 121 }
 122
 123 fdt_addr_t fdtdec_get_addr(const void *blob, int node,
 124                 const char *prop_name)
 125 {
 126         return fdtdec_get_addr_size(blob, node, prop_name, NULL);
 127 }
 128
 129 uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
 130                 uint64_t default_val)
 131 {
 132         const uint64_t *cell64;
 133         int length;
 134
 135         cell64 = fdt_getprop(blob, node, prop_name, &length);
 136         if (!cell64 || length < sizeof(*cell64))
 137                 return default_val;
 138
 139         return fdt64_to_cpu(*cell64);
 140 }
 141
 142 int fdtdec_get_is_enabled(const void *blob, int node)
 143 {
 144         const char *cell;
 145
 146         /*
 147          * It should say "okay", so only allow that. Some fdts use "ok" but
 148          * this is a bug. Please fix your device tree source file. See here
 149          * for discussion:
 150          *
 151          * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html
 152          */
 153         cell = fdt_getprop(blob, node, "status", NULL);
 154         if (cell)
 155                 return 0 == strcmp(cell, "okay");
 156         return 1;
 157 }
 158
 159 enum fdt_compat_id fdtdec_lookup(const void *blob, int node)
 160 {
 161         enum fdt_compat_id id;
 162
 163         /* Search our drivers */
 164         for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++)
 165                 if (0 == fdt_node_check_compatible(blob, node,
 166                                 compat_names[id]))
 167                         return id;
 168         return COMPAT_UNKNOWN;
 169 }
 170
 171 int fdtdec_next_compatible(const void *blob, int node,
 172                 enum fdt_compat_id id)
 173 {
 174         return fdt_node_offset_by_compatible(blob, node, compat_names[id]);
 175 }
 176
 177 int fdtdec_next_compatible_subnode(const void *blob, int node,
 178                 enum fdt_compat_id id, int *depthp)
 179 {
 180         do {
 181                 node = fdt_next_node(blob, node, depthp);
 182         } while (*depthp > 1);
 183
 184         /* If this is a direct subnode, and compatible, return it */
 185         if (*depthp == 1 && 0 == fdt_node_check_compatible(
 186                                                 blob, node, compat_names[id]))
 187                 return node;
 188
 189         return -FDT_ERR_NOTFOUND;
 190 }
 191
 192 int fdtdec_next_alias(const void *blob, const char *name,
 193                 enum fdt_compat_id id, int *upto)
 194 {
 195 #define MAX_STR_LEN 20
 196         char str[MAX_STR_LEN + 20];
 197         int node, err;
 198
 199         /* snprintf() is not available */
 200         assert(strlen(name) < MAX_STR_LEN);
 201         sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto);
 202         node = fdt_path_offset(blob, str);
 203         if (node < 0)
 204                 return node;
 205         err = fdt_node_check_compatible(blob, node, compat_names[id]);
 206         if (err < 0)
 207                 return err;
 208         if (err)
 209                 return -FDT_ERR_NOTFOUND;
 210         (*upto)++;
 211         return node;
 212 }
 213
 214 int fdtdec_find_aliases_for_id(const void *blob, const char *name,
 215                         enum fdt_compat_id id, int *node_list, int maxcount)
 216 {
 217         memset(node_list, '\0', sizeof(*node_list) * maxcount);
 218
 219         return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount);
 220 }
 221
 222 /* TODO: Can we tighten this code up a little? */
 223 int fdtdec_add_aliases_for_id(const void *blob, const char *name,
 224                         enum fdt_compat_id id, int *node_list, int maxcount)
 225 {
 226         int name_len = strlen(name);
 227         int nodes[maxcount];
 228         int num_found = 0;
 229         int offset, node;
 230         int alias_node;
 231         int count;
 232         int i, j;
 233
 234         /* find the alias node if present */
 235         alias_node = fdt_path_offset(blob, "/aliases");
 236
 237         /*
 238          * start with nothing, and we can assume that the root node can't
 239          * match
 240          */
 241         memset(nodes, '\0', sizeof(nodes));
 242
 243         /* First find all the compatible nodes */
 244         for (node = count = 0; node >= 0 && count < maxcount;) {
 245                 node = fdtdec_next_compatible(blob, node, id);
 246                 if (node >= 0)
 247                         nodes[count++] = node;
 248         }
 249         if (node >= 0)
 250                 debug("%s: warning: maxcount exceeded with alias '%s'\n",
 251                        __func__, name);
 252
 253         /* Now find all the aliases */
 254         for (offset = fdt_first_property_offset(blob, alias_node);
 255                         offset > 0;
 256                         offset = fdt_next_property_offset(blob, offset)) {
 257                 const struct fdt_property *prop;
 258                 const char *path;
 259                 int number;
 260                 int found;
 261
 262                 node = 0;
 263                 prop = fdt_get_property_by_offset(blob, offset, NULL);
 264                 path = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
 265                 if (prop->len && 0 == strncmp(path, name, name_len))
 266                         node = fdt_path_offset(blob, prop->data);
 267                 if (node <= 0)
 268                         continue;
 269
 270                 /* Get the alias number */
 271                 number = simple_strtoul(path + name_len, NULL, 10);
 272                 if (number < 0 || number >= maxcount) {
 273                         debug("%s: warning: alias '%s' is out of range\n",
 274                                __func__, path);
 275                         continue;
 276                 }
 277
 278                 /* Make sure the node we found is actually in our list! */
 279                 found = -1;
 280                 for (j = 0; j < count; j++)
 281                         if (nodes[j] == node) {
 282                                 found = j;
 283                                 break;
 284                         }
 285
 286                 if (found == -1) {
 287                         debug("%s: warning: alias '%s' points to a node "
 288                                 "'%s' that is missing or is not compatible "
 289                                 " with '%s'\n", __func__, path,
 290                                 fdt_get_name(blob, node, NULL),
 291                                compat_names[id]);
 292                         continue;
 293                 }
 294
 295                 /*
 296                  * Add this node to our list in the right place, and mark
 297                  * it as done.
 298                  */
 299                 if (fdtdec_get_is_enabled(blob, node)) {
 300                         if (node_list[number]) {
 301                                 debug("%s: warning: alias '%s' requires that "
 302                                       "a node be placed in the list in a "
 303                                       "position which is already filled by "
 304                                       "node '%s'\n", __func__, path,
 305                                       fdt_get_name(blob, node, NULL));
 306                                 continue;
 307                         }
 308                         node_list[number] = node;
 309                         if (number >= num_found)
 310                                 num_found = number + 1;
 311                 }
 312                 nodes[found] = 0;
 313         }
 314
 315         /* Add any nodes not mentioned by an alias */
 316         for (i = j = 0; i < maxcount; i++) {
 317                 if (!node_list[i]) {
 318                         for (; j < maxcount; j++)
 319                                 if (nodes[j] &&
 320                                         fdtdec_get_is_enabled(blob, nodes[j]))
 321                                         break;
 322
 323                         /* Have we run out of nodes to add? */
 324                         if (j == maxcount)
 325                                 break;
 326
 327                         assert(!node_list[i]);
 328                         node_list[i] = nodes[j++];
 329                         if (i >= num_found)
 330                                 num_found = i + 1;
 331                 }
 332         }
 333
 334         return num_found;
 335 }
 336
 337 int fdtdec_get_alias_seq(const void *blob, const char *base, int offset,
 338                          int *seqp)
 339 {
 340         int base_len = strlen(base);
 341         const char *find_name;
 342         int find_namelen;
 343         int prop_offset;
 344         int aliases;
 345
 346         find_name = fdt_get_name(blob, offset, &find_namelen);
 347         debug("Looking for '%s' at %d, name %s\n", base, offset, find_name);
 348
 349         aliases = fdt_path_offset(blob, "/aliases");
 350         for (prop_offset = fdt_first_property_offset(blob, aliases);
 351              prop_offset > 0;
 352              prop_offset = fdt_next_property_offset(blob, prop_offset)) {
 353                 const char *prop;
 354                 const char *name;
 355                 const char *slash;
 356                 const char *p;
 357                 int len;
 358
 359                 prop = fdt_getprop_by_offset(blob, prop_offset, &name, &len);
 360                 debug("   - %s, %s\n", name, prop);
 361                 if (len < find_namelen || *prop != '/' || prop[len - 1] ||
 362                     strncmp(name, base, base_len))
 363                         continue;
 364
 365                 slash = strrchr(prop, '/');
 366                 if (strcmp(slash + 1, find_name))
 367                         continue;
 368                 for (p = name + strlen(name) - 1; p > name; p--) {
 369                         if (!isdigit(*p)) {
 370                                 *seqp = simple_strtoul(p + 1, NULL, 10);
 371                                 debug("Found seq %d\n", *seqp);
 372                                 return 0;
 373                         }
 374                 }
 375         }
 376
 377         debug("Not found\n");
 378         return -ENOENT;
 379 }
 380
 381 int fdtdec_get_chosen_node(const void *blob, const char *name)
 382 {
 383         const char *prop;
 384         int chosen_node;
 385         int len;
 386
 387         if (!blob)
 388                 return -FDT_ERR_NOTFOUND;
 389         chosen_node = fdt_path_offset(blob, "/chosen");
 390         prop = fdt_getprop(blob, chosen_node, name, &len);
 391         if (!prop)
 392                 return -FDT_ERR_NOTFOUND;
 393         return fdt_path_offset(blob, prop);
 394 }
 395
 396 int fdtdec_check_fdt(void)
 397 {
 398         /*
 399          * We must have an FDT, but we cannot panic() yet since the console
 400          * is not ready. So for now, just assert(). Boards which need an early
 401          * FDT (prior to console ready) will need to make their own
 402          * arrangements and do their own checks.
 403          */
 404         assert(!fdtdec_prepare_fdt());
 405         return 0;
 406 }
 407
 408 /*
 409  * This function is a little odd in that it accesses global data. At some
 410  * point if the architecture board.c files merge this will make more sense.
 411  * Even now, it is common code.
 412  */
 413 int fdtdec_prepare_fdt(void)
 414 {
 415         if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) ||
 416             fdt_check_header(gd->fdt_blob)) {
 417                 printf("No valid FDT found - please append one to U-Boot "
 418                         "binary, use u-boot-dtb.bin or define "
 419                         "CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>\n");
 420                 return -1;
 421         }
 422         return 0;
 423 }
 424
 425 int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name)
 426 {
 427         const u32 *phandle;
 428         int lookup;
 429
 430         debug("%s: %s\n", __func__, prop_name);
 431         phandle = fdt_getprop(blob, node, prop_name, NULL);
 432         if (!phandle)
 433                 return -FDT_ERR_NOTFOUND;
 434
 435         lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle));
 436         return lookup;
 437 }
 438
 439 /**
 440  * Look up a property in a node and check that it has a minimum length.
 441  *
 442  * @param blob          FDT blob
 443  * @param node          node to examine
 444  * @param prop_name     name of property to find
 445  * @param min_len       minimum property length in bytes
 446  * @param err           0 if ok, or -FDT_ERR_NOTFOUND if the property is not
 447                         found, or -FDT_ERR_BADLAYOUT if not enough data
 448  * @return pointer to cell, which is only valid if err == 0
 449  */
 450 static const void *get_prop_check_min_len(const void *blob, int node,
 451                 const char *prop_name, int min_len, int *err)
 452 {
 453         const void *cell;
 454         int len;
 455
 456         debug("%s: %s\n", __func__, prop_name);
 457         cell = fdt_getprop(blob, node, prop_name, &len);
 458         if (!cell)
 459                 *err = -FDT_ERR_NOTFOUND;
 460         else if (len < min_len)
 461                 *err = -FDT_ERR_BADLAYOUT;
 462         else
 463                 *err = 0;
 464         return cell;
 465 }
 466
 467 int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
 468                 u32 *array, int count)
 469 {
 470         const u32 *cell;
 471         int i, err = 0;
 472
 473         debug("%s: %s\n", __func__, prop_name);
 474         cell = get_prop_check_min_len(blob, node, prop_name,
 475                                       sizeof(u32) * count, &err);
 476         if (!err) {
 477                 for (i = 0; i < count; i++)
 478                         array[i] = fdt32_to_cpu(cell[i]);
 479         }
 480         return err;
 481 }
 482
 483 int fdtdec_get_int_array_count(const void *blob, int node,
 484                                const char *prop_name, u32 *array, int count)
 485 {
 486         const u32 *cell;
 487         int len, elems;
 488         int i;
 489
 490         debug("%s: %s\n", __func__, prop_name);
 491         cell = fdt_getprop(blob, node, prop_name, &len);
 492         if (!cell)
 493                 return -FDT_ERR_NOTFOUND;
 494         elems = len / sizeof(u32);
 495         if (count > elems)
 496                 count = elems;
 497         for (i = 0; i < count; i++)
 498                 array[i] = fdt32_to_cpu(cell[i]);
 499
 500         return count;
 501 }
 502
 503 const u32 *fdtdec_locate_array(const void *blob, int node,
 504                                const char *prop_name, int count)
 505 {
 506         const u32 *cell;
 507         int err;
 508
 509         cell = get_prop_check_min_len(blob, node, prop_name,
 510                                       sizeof(u32) * count, &err);
 511         return err ? NULL : cell;
 512 }
 513
 514 int fdtdec_get_bool(const void *blob, int node, const char *prop_name)
 515 {
 516         const s32 *cell;
 517         int len;
 518
 519         debug("%s: %s\n", __func__, prop_name);
 520         cell = fdt_getprop(blob, node, prop_name, &len);
 521         return cell != NULL;
 522 }
 523
 524 /**
 525  * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no
 526  * terminating item.
 527  *
 528  * @param blob          FDT blob to use
 529  * @param node          Node to look at
 530  * @param prop_name     Node property name
 531  * @param gpio          Array of gpio elements to fill from FDT. This will be
 532  *                      untouched if either 0 or an error is returned
 533  * @param max_count     Maximum number of elements allowed
 534  * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would
 535  * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing.
 536  */
 537 int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name,
 538                 struct fdt_gpio_state *gpio, int max_count)
 539 {
 540         const struct fdt_property *prop;
 541         const u32 *cell;
 542         const char *name;
 543         int len, i;
 544
 545         debug("%s: %s\n", __func__, prop_name);
 546         assert(max_count > 0);
 547         prop = fdt_get_property(blob, node, prop_name, &len);
 548         if (!prop) {
 549                 debug("%s: property '%s' missing\n", __func__, prop_name);
 550                 return -FDT_ERR_NOTFOUND;
 551         }
 552
 553         /* We will use the name to tag the GPIO */
 554         name = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
 555         cell = (u32 *)prop->data;
 556         len /= sizeof(u32) * 3;         /* 3 cells per GPIO record */
 557         if (len > max_count) {
 558                 debug(" %s: too many GPIOs / cells for "
 559                         "property '%s'\n", __func__, prop_name);
 560                 return -FDT_ERR_BADLAYOUT;
 561         }
 562
 563         /* Read out the GPIO data from the cells */
 564         for (i = 0; i < len; i++, cell += 3) {
 565                 gpio[i].gpio = fdt32_to_cpu(cell[1]);
 566                 gpio[i].flags = fdt32_to_cpu(cell[2]);
 567                 gpio[i].name = name;
 568         }
 569
 570         return len;
 571 }
 572
 573 int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name,
 574                 struct fdt_gpio_state *gpio)
 575 {
 576         int err;
 577
 578         debug("%s: %s\n", __func__, prop_name);
 579         gpio->gpio = FDT_GPIO_NONE;
 580         gpio->name = NULL;
 581         err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1);
 582         return err == 1 ? 0 : err;
 583 }
 584
 585 int fdtdec_get_gpio(struct fdt_gpio_state *gpio)
 586 {
 587         int val;
 588
 589         if (!fdt_gpio_isvalid(gpio))
 590                 return -1;
 591
 592         val = gpio_get_value(gpio->gpio);
 593         return gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val;
 594 }
 595
 596 int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val)
 597 {
 598         if (!fdt_gpio_isvalid(gpio))
 599                 return -1;
 600
 601         val = gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val;
 602         return gpio_set_value(gpio->gpio, val);
 603 }
 604
 605 int fdtdec_setup_gpio(struct fdt_gpio_state *gpio)
 606 {
 607         /*
 608          * Return success if there is no GPIO defined. This is used for
 609          * optional GPIOs)
 610          */
 611         if (!fdt_gpio_isvalid(gpio))
 612                 return 0;
 613
 614         if (gpio_request(gpio->gpio, gpio->name))
 615                 return -1;
 616         return 0;
 617 }
 618
 619 int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
 620                 u8 *array, int count)
 621 {
 622         const u8 *cell;
 623         int err;
 624
 625         cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
 626         if (!err)
 627                 memcpy(array, cell, count);
 628         return err;
 629 }
 630
 631 const u8 *fdtdec_locate_byte_array(const void *blob, int node,
 632                              const char *prop_name, int count)
 633 {
 634         const u8 *cell;
 635         int err;
 636
 637         cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
 638         if (err)
 639                 return NULL;
 640         return cell;
 641 }
 642
 643 int fdtdec_get_config_int(const void *blob, const char *prop_name,
 644                 int default_val)
 645 {
 646         int config_node;
 647
 648         debug("%s: %s\n", __func__, prop_name);
 649         config_node = fdt_path_offset(blob, "/config");
 650         if (config_node < 0)
 651                 return default_val;
 652         return fdtdec_get_int(blob, config_node, prop_name, default_val);
 653 }
 654
 655 int fdtdec_get_config_bool(const void *blob, const char *prop_name)
 656 {
 657         int config_node;
 658         const void *prop;
 659
 660         debug("%s: %s\n", __func__, prop_name);
 661         config_node = fdt_path_offset(blob, "/config");
 662         if (config_node < 0)
 663                 return 0;
 664         prop = fdt_get_property(blob, config_node, prop_name, NULL);
 665
 666         return prop != NULL;
 667 }
 668
 669 char *fdtdec_get_config_string(const void *blob, const char *prop_name)
 670 {
 671         const char *nodep;
 672         int nodeoffset;
 673         int len;
 674
 675         debug("%s: %s\n", __func__, prop_name);
 676         nodeoffset = fdt_path_offset(blob, "/config");
 677         if (nodeoffset < 0)
 678                 return NULL;
 679
 680         nodep = fdt_getprop(blob, nodeoffset, prop_name, &len);
 681         if (!nodep)
 682                 return NULL;
 683
 684         return (char *)nodep;
 685 }
 686
 687 int fdtdec_decode_region(const void *blob, int node, const char *prop_name,
 688                          fdt_addr_t *basep, fdt_size_t *sizep)
 689 {
 690         const fdt_addr_t *cell;
 691         int len;
 692
 693         debug("%s: %s: %s\n", __func__, fdt_get_name(blob, node, NULL),
 694               prop_name);
 695         cell = fdt_getprop(blob, node, prop_name, &len);
 696         if (!cell || (len < sizeof(fdt_addr_t) * 2)) {
 697                 debug("cell=%p, len=%d\n", cell, len);
 698                 return -1;
 699         }
 700
 701         *basep = fdt_addr_to_cpu(*cell);
 702         *sizep = fdt_size_to_cpu(cell[1]);
 703         debug("%s: base=%08lx, size=%lx\n", __func__, (ulong)*basep,
 704               (ulong)*sizep);
 705
 706         return 0;
 707 }
 708
 709 /**
 710  * Read a flash entry from the fdt
 711  *
 712  * @param blob          FDT blob
 713  * @param node          Offset of node to read
 714  * @param name          Name of node being read
 715  * @param entry         Place to put offset and size of this node
 716  * @return 0 if ok, -ve on error
 717  */
 718 int fdtdec_read_fmap_entry(const void *blob, int node, const char *name,
 719                            struct fmap_entry *entry)
 720 {
 721         const char *prop;
 722         u32 reg[2];
 723
 724         if (fdtdec_get_int_array(blob, node, "reg", reg, 2)) {
 725                 debug("Node '%s' has bad/missing 'reg' property\n", name);
 726                 return -FDT_ERR_NOTFOUND;
 727         }
 728         entry->offset = reg[0];
 729         entry->length = reg[1];
 730         entry->used = fdtdec_get_int(blob, node, "used", entry->length);
 731         prop = fdt_getprop(blob, node, "compress", NULL);
 732         entry->compress_algo = prop && !strcmp(prop, "lzo") ?
 733                 FMAP_COMPRESS_LZO : FMAP_COMPRESS_NONE;
 734         prop = fdt_getprop(blob, node, "hash", &entry->hash_size);
 735         entry->hash_algo = prop ? FMAP_HASH_SHA256 : FMAP_HASH_NONE;
 736         entry->hash = (uint8_t *)prop;
 737
 738         return 0;
 739 }
 740
 741 static u64 fdtdec_get_number(const fdt32_t *ptr, unsigned int cells)
 742 {
 743         u64 number = 0;
 744
 745         while (cells--)
 746                 number = (number << 32) | fdt32_to_cpu(*ptr++);
 747
 748         return number;
 749 }
 750
 751 int fdt_get_resource(const void *fdt, int node, const char *property,
 752                      unsigned int index, struct fdt_resource *res)
 753 {
 754         const fdt32_t *ptr, *end;
 755         int na, ns, len, parent;
 756         unsigned int i = 0;
 757
 758         parent = fdt_parent_offset(fdt, node);
 759         if (parent < 0)
 760                 return parent;
 761
 762         na = fdt_address_cells(fdt, parent);
 763         ns = fdt_size_cells(fdt, parent);
 764
 765         ptr = fdt_getprop(fdt, node, property, &len);
 766         if (!ptr)
 767                 return len;
 768
 769         end = ptr + len / sizeof(*ptr);
 770
 771         while (ptr + na + ns <= end) {
 772                 if (i == index) {
 773                         res->start = res->end = fdtdec_get_number(ptr, na);
 774                         res->end += fdtdec_get_number(&ptr[na], ns) - 1;
 775                         return 0;
 776                 }
 777
 778                 ptr += na + ns;
 779                 i++;
 780         }
 781
 782         return -FDT_ERR_NOTFOUND;
 783 }
 784
 785 int fdt_get_named_resource(const void *fdt, int node, const char *property,
 786                            const char *prop_names, const char *name,
 787                            struct fdt_resource *res)
 788 {
 789         int index;
 790
 791         index = fdt_find_string(fdt, node, prop_names, name);
 792         if (index < 0)
 793                 return index;
 794
 795         return fdt_get_resource(fdt, node, property, index, res);
 796 }
 797
 798 int fdtdec_pci_get_bdf(const void *fdt, int node, int *bdf)
 799 {
 800         const fdt32_t *prop;
 801         int len;
 802
 803         prop = fdt_getprop(fdt, node, "reg", &len);
 804         if (!prop)
 805                 return len;
 806
 807         *bdf = fdt32_to_cpu(*prop) & 0xffffff;
 808
 809         return 0;
 810 }
 811
 812 int fdtdec_decode_memory_region(const void *blob, int config_node,
 813                                 const char *mem_type, const char *suffix,
 814                                 fdt_addr_t *basep, fdt_size_t *sizep)
 815 {
 816         char prop_name[50];
 817         const char *mem;
 818         fdt_size_t size, offset_size;
 819         fdt_addr_t base, offset;
 820         int node;
 821
 822         if (config_node == -1) {
 823                 config_node = fdt_path_offset(blob, "/config");
 824                 if (config_node < 0) {
 825                         debug("%s: Cannot find /config node\n", __func__);
 826                         return -ENOENT;
 827                 }
 828         }
 829         if (!suffix)
 830                 suffix = "";
 831
 832         snprintf(prop_name, sizeof(prop_name), "%s-memory%s", mem_type,
 833                  suffix);
 834         mem = fdt_getprop(blob, config_node, prop_name, NULL);
 835         if (!mem) {
 836                 debug("%s: No memory type for '%s', using /memory\n", __func__,
 837                       prop_name);
 838                 mem = "/memory";
 839         }
 840
 841         node = fdt_path_offset(blob, mem);
 842         if (node < 0) {
 843                 debug("%s: Failed to find node '%s': %s\n", __func__, mem,
 844                       fdt_strerror(node));
 845                 return -ENOENT;
 846         }
 847
 848         /*
 849          * Not strictly correct - the memory may have multiple banks. We just
 850          * use the first
 851          */
 852         if (fdtdec_decode_region(blob, node, "reg", &base, &size)) {
 853                 debug("%s: Failed to decode memory region %s\n", __func__,
 854                       mem);
 855                 return -EINVAL;
 856         }
 857
 858         snprintf(prop_name, sizeof(prop_name), "%s-offset%s", mem_type,
 859                  suffix);
 860         if (fdtdec_decode_region(blob, config_node, prop_name, &offset,
 861                                  &offset_size)) {
 862                 debug("%s: Failed to decode memory region '%s'\n", __func__,
 863                       prop_name);
 864                 return -EINVAL;
 865         }
 866
 867         *basep = base + offset;
 868         *sizep = offset_size;
 869
 870         return 0;
 871 }
 872 #endif