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         COMPAT(SAMSUNG_EXYNOS_SYSMMU, "samsung,sysmmu-v3.3"),
  74         COMPAT(PARADE_PS8625, "parade,ps8625"),
  75         COMPAT(COMPAT_INTEL_LPC, "intel,lpc"),
  76         COMPAT(INTEL_MICROCODE, "intel,microcode"),
  77         COMPAT(MEMORY_SPD, "memory-spd"),
  78 };
  79
  80 const char *fdtdec_get_compatible(enum fdt_compat_id id)
  81 {
  82         /* We allow reading of the 'unknown' ID for testing purposes */
  83         assert(id >= 0 && id < COMPAT_COUNT);
  84         return compat_names[id];
  85 }
  86
  87 fdt_addr_t fdtdec_get_addr_size(const void *blob, int node,
  88                 const char *prop_name, fdt_size_t *sizep)
  89 {
  90         const fdt_addr_t *cell;
  91         int len;
  92
  93         debug("%s: %s: ", __func__, prop_name);
  94         cell = fdt_getprop(blob, node, prop_name, &len);
  95         if (cell && ((!sizep && len == sizeof(fdt_addr_t)) ||
  96                      len == sizeof(fdt_addr_t) * 2)) {
  97                 fdt_addr_t addr = fdt_addr_to_cpu(*cell);
  98                 if (sizep) {
  99                         const fdt_size_t *size;
 100
 101                         size = (fdt_size_t *)((char *)cell +
 102                                         sizeof(fdt_addr_t));
 103                         *sizep = fdt_size_to_cpu(*size);
 104                         debug("addr=%08lx, size=%08x\n",
 105                               (ulong)addr, *sizep);
 106                 } else {
 107                         debug("%08lx\n", (ulong)addr);
 108                 }
 109                 return addr;
 110         }
 111         debug("(not found)\n");
 112         return FDT_ADDR_T_NONE;
 113 }
 114
 115 fdt_addr_t fdtdec_get_addr(const void *blob, int node,
 116                 const char *prop_name)
 117 {
 118         return fdtdec_get_addr_size(blob, node, prop_name, NULL);
 119 }
 120
 121 uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
 122                 uint64_t default_val)
 123 {
 124         const uint64_t *cell64;
 125         int length;
 126
 127         cell64 = fdt_getprop(blob, node, prop_name, &length);
 128         if (!cell64 || length < sizeof(*cell64))
 129                 return default_val;
 130
 131         return fdt64_to_cpu(*cell64);
 132 }
 133
 134 int fdtdec_get_is_enabled(const void *blob, int node)
 135 {
 136         const char *cell;
 137
 138         /*
 139          * It should say "okay", so only allow that. Some fdts use "ok" but
 140          * this is a bug. Please fix your device tree source file. See here
 141          * for discussion:
 142          *
 143          * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html
 144          */
 145         cell = fdt_getprop(blob, node, "status", NULL);
 146         if (cell)
 147                 return 0 == strcmp(cell, "okay");
 148         return 1;
 149 }
 150
 151 enum fdt_compat_id fdtdec_lookup(const void *blob, int node)
 152 {
 153         enum fdt_compat_id id;
 154
 155         /* Search our drivers */
 156         for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++)
 157                 if (0 == fdt_node_check_compatible(blob, node,
 158                                 compat_names[id]))
 159                         return id;
 160         return COMPAT_UNKNOWN;
 161 }
 162
 163 int fdtdec_next_compatible(const void *blob, int node,
 164                 enum fdt_compat_id id)
 165 {
 166         return fdt_node_offset_by_compatible(blob, node, compat_names[id]);
 167 }
 168
 169 int fdtdec_next_compatible_subnode(const void *blob, int node,
 170                 enum fdt_compat_id id, int *depthp)
 171 {
 172         do {
 173                 node = fdt_next_node(blob, node, depthp);
 174         } while (*depthp > 1);
 175
 176         /* If this is a direct subnode, and compatible, return it */
 177         if (*depthp == 1 && 0 == fdt_node_check_compatible(
 178                                                 blob, node, compat_names[id]))
 179                 return node;
 180
 181         return -FDT_ERR_NOTFOUND;
 182 }
 183
 184 int fdtdec_next_alias(const void *blob, const char *name,
 185                 enum fdt_compat_id id, int *upto)
 186 {
 187 #define MAX_STR_LEN 20
 188         char str[MAX_STR_LEN + 20];
 189         int node, err;
 190
 191         /* snprintf() is not available */
 192         assert(strlen(name) < MAX_STR_LEN);
 193         sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto);
 194         node = fdt_path_offset(blob, str);
 195         if (node < 0)
 196                 return node;
 197         err = fdt_node_check_compatible(blob, node, compat_names[id]);
 198         if (err < 0)
 199                 return err;
 200         if (err)
 201                 return -FDT_ERR_NOTFOUND;
 202         (*upto)++;
 203         return node;
 204 }
 205
 206 int fdtdec_find_aliases_for_id(const void *blob, const char *name,
 207                         enum fdt_compat_id id, int *node_list, int maxcount)
 208 {
 209         memset(node_list, '\0', sizeof(*node_list) * maxcount);
 210
 211         return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount);
 212 }
 213
 214 /* TODO: Can we tighten this code up a little? */
 215 int fdtdec_add_aliases_for_id(const void *blob, const char *name,
 216                         enum fdt_compat_id id, int *node_list, int maxcount)
 217 {
 218         int name_len = strlen(name);
 219         int nodes[maxcount];
 220         int num_found = 0;
 221         int offset, node;
 222         int alias_node;
 223         int count;
 224         int i, j;
 225
 226         /* find the alias node if present */
 227         alias_node = fdt_path_offset(blob, "/aliases");
 228
 229         /*
 230          * start with nothing, and we can assume that the root node can't
 231          * match
 232          */
 233         memset(nodes, '\0', sizeof(nodes));
 234
 235         /* First find all the compatible nodes */
 236         for (node = count = 0; node >= 0 && count < maxcount;) {
 237                 node = fdtdec_next_compatible(blob, node, id);
 238                 if (node >= 0)
 239                         nodes[count++] = node;
 240         }
 241         if (node >= 0)
 242                 debug("%s: warning: maxcount exceeded with alias '%s'\n",
 243                        __func__, name);
 244
 245         /* Now find all the aliases */
 246         for (offset = fdt_first_property_offset(blob, alias_node);
 247                         offset > 0;
 248                         offset = fdt_next_property_offset(blob, offset)) {
 249                 const struct fdt_property *prop;
 250                 const char *path;
 251                 int number;
 252                 int found;
 253
 254                 node = 0;
 255                 prop = fdt_get_property_by_offset(blob, offset, NULL);
 256                 path = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
 257                 if (prop->len && 0 == strncmp(path, name, name_len))
 258                         node = fdt_path_offset(blob, prop->data);
 259                 if (node <= 0)
 260                         continue;
 261
 262                 /* Get the alias number */
 263                 number = simple_strtoul(path + name_len, NULL, 10);
 264                 if (number < 0 || number >= maxcount) {
 265                         debug("%s: warning: alias '%s' is out of range\n",
 266                                __func__, path);
 267                         continue;
 268                 }
 269
 270                 /* Make sure the node we found is actually in our list! */
 271                 found = -1;
 272                 for (j = 0; j < count; j++)
 273                         if (nodes[j] == node) {
 274                                 found = j;
 275                                 break;
 276                         }
 277
 278                 if (found == -1) {
 279                         debug("%s: warning: alias '%s' points to a node "
 280                                 "'%s' that is missing or is not compatible "
 281                                 " with '%s'\n", __func__, path,
 282                                 fdt_get_name(blob, node, NULL),
 283                                compat_names[id]);
 284                         continue;
 285                 }
 286
 287                 /*
 288                  * Add this node to our list in the right place, and mark
 289                  * it as done.
 290                  */
 291                 if (fdtdec_get_is_enabled(blob, node)) {
 292                         if (node_list[number]) {
 293                                 debug("%s: warning: alias '%s' requires that "
 294                                       "a node be placed in the list in a "
 295                                       "position which is already filled by "
 296                                       "node '%s'\n", __func__, path,
 297                                       fdt_get_name(blob, node, NULL));
 298                                 continue;
 299                         }
 300                         node_list[number] = node;
 301                         if (number >= num_found)
 302                                 num_found = number + 1;
 303                 }
 304                 nodes[found] = 0;
 305         }
 306
 307         /* Add any nodes not mentioned by an alias */
 308         for (i = j = 0; i < maxcount; i++) {
 309                 if (!node_list[i]) {
 310                         for (; j < maxcount; j++)
 311                                 if (nodes[j] &&
 312                                         fdtdec_get_is_enabled(blob, nodes[j]))
 313                                         break;
 314
 315                         /* Have we run out of nodes to add? */
 316                         if (j == maxcount)
 317                                 break;
 318
 319                         assert(!node_list[i]);
 320                         node_list[i] = nodes[j++];
 321                         if (i >= num_found)
 322                                 num_found = i + 1;
 323                 }
 324         }
 325
 326         return num_found;
 327 }
 328
 329 int fdtdec_get_alias_seq(const void *blob, const char *base, int offset,
 330                          int *seqp)
 331 {
 332         int base_len = strlen(base);
 333         const char *find_name;
 334         int find_namelen;
 335         int prop_offset;
 336         int aliases;
 337
 338         find_name = fdt_get_name(blob, offset, &find_namelen);
 339         debug("Looking for '%s' at %d, name %s\n", base, offset, find_name);
 340
 341         aliases = fdt_path_offset(blob, "/aliases");
 342         for (prop_offset = fdt_first_property_offset(blob, aliases);
 343              prop_offset > 0;
 344              prop_offset = fdt_next_property_offset(blob, prop_offset)) {
 345                 const char *prop;
 346                 const char *name;
 347                 const char *slash;
 348                 const char *p;
 349                 int len;
 350
 351                 prop = fdt_getprop_by_offset(blob, prop_offset, &name, &len);
 352                 debug("   - %s, %s\n", name, prop);
 353                 if (len < find_namelen || *prop != '/' || prop[len - 1] ||
 354                     strncmp(name, base, base_len))
 355                         continue;
 356
 357                 slash = strrchr(prop, '/');
 358                 if (strcmp(slash + 1, find_name))
 359                         continue;
 360                 for (p = name + strlen(name) - 1; p > name; p--) {
 361                         if (!isdigit(*p)) {
 362                                 *seqp = simple_strtoul(p + 1, NULL, 10);
 363                                 debug("Found seq %d\n", *seqp);
 364                                 return 0;
 365                         }
 366                 }
 367         }
 368
 369         debug("Not found\n");
 370         return -ENOENT;
 371 }
 372
 373 int fdtdec_get_alias_node(const void *blob, const char *name)
 374 {
 375         const char *prop;
 376         int alias_node;
 377         int len;
 378
 379         if (!blob)
 380                 return -FDT_ERR_NOTFOUND;
 381         alias_node = fdt_path_offset(blob, "/aliases");
 382         prop = fdt_getprop(blob, alias_node, name, &len);
 383         if (!prop)
 384                 return -FDT_ERR_NOTFOUND;
 385         return fdt_path_offset(blob, prop);
 386 }
 387
 388 int fdtdec_get_chosen_node(const void *blob, const char *name)
 389 {
 390         const char *prop;
 391         int chosen_node;
 392         int len;
 393
 394         if (!blob)
 395                 return -FDT_ERR_NOTFOUND;
 396         chosen_node = fdt_path_offset(blob, "/chosen");
 397         prop = fdt_getprop(blob, chosen_node, name, &len);
 398         if (!prop)
 399                 return -FDT_ERR_NOTFOUND;
 400         return fdt_path_offset(blob, prop);
 401 }
 402
 403 int fdtdec_check_fdt(void)
 404 {
 405         /*
 406          * We must have an FDT, but we cannot panic() yet since the console
 407          * is not ready. So for now, just assert(). Boards which need an early
 408          * FDT (prior to console ready) will need to make their own
 409          * arrangements and do their own checks.
 410          */
 411         assert(!fdtdec_prepare_fdt());
 412         return 0;
 413 }
 414
 415 /*
 416  * This function is a little odd in that it accesses global data. At some
 417  * point if the architecture board.c files merge this will make more sense.
 418  * Even now, it is common code.
 419  */
 420 int fdtdec_prepare_fdt(void)
 421 {
 422         if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) ||
 423             fdt_check_header(gd->fdt_blob)) {
 424                 printf("No valid FDT found - please append one to U-Boot "
 425                         "binary, use u-boot-dtb.bin or define "
 426                         "CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>\n");
 427                 return -1;
 428         }
 429         return 0;
 430 }
 431
 432 int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name)
 433 {
 434         const u32 *phandle;
 435         int lookup;
 436
 437         debug("%s: %s\n", __func__, prop_name);
 438         phandle = fdt_getprop(blob, node, prop_name, NULL);
 439         if (!phandle)
 440                 return -FDT_ERR_NOTFOUND;
 441
 442         lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle));
 443         return lookup;
 444 }
 445
 446 /**
 447  * Look up a property in a node and check that it has a minimum length.
 448  *
 449  * @param blob          FDT blob
 450  * @param node          node to examine
 451  * @param prop_name     name of property to find
 452  * @param min_len       minimum property length in bytes
 453  * @param err           0 if ok, or -FDT_ERR_NOTFOUND if the property is not
 454                         found, or -FDT_ERR_BADLAYOUT if not enough data
 455  * @return pointer to cell, which is only valid if err == 0
 456  */
 457 static const void *get_prop_check_min_len(const void *blob, int node,
 458                 const char *prop_name, int min_len, int *err)
 459 {
 460         const void *cell;
 461         int len;
 462
 463         debug("%s: %s\n", __func__, prop_name);
 464         cell = fdt_getprop(blob, node, prop_name, &len);
 465         if (!cell)
 466                 *err = -FDT_ERR_NOTFOUND;
 467         else if (len < min_len)
 468                 *err = -FDT_ERR_BADLAYOUT;
 469         else
 470                 *err = 0;
 471         return cell;
 472 }
 473
 474 int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
 475                 u32 *array, int count)
 476 {
 477         const u32 *cell;
 478         int i, err = 0;
 479
 480         debug("%s: %s\n", __func__, prop_name);
 481         cell = get_prop_check_min_len(blob, node, prop_name,
 482                                       sizeof(u32) * count, &err);
 483         if (!err) {
 484                 for (i = 0; i < count; i++)
 485                         array[i] = fdt32_to_cpu(cell[i]);
 486         }
 487         return err;
 488 }
 489
 490 int fdtdec_get_int_array_count(const void *blob, int node,
 491                                const char *prop_name, u32 *array, int count)
 492 {
 493         const u32 *cell;
 494         int len, elems;
 495         int i;
 496
 497         debug("%s: %s\n", __func__, prop_name);
 498         cell = fdt_getprop(blob, node, prop_name, &len);
 499         if (!cell)
 500                 return -FDT_ERR_NOTFOUND;
 501         elems = len / sizeof(u32);
 502         if (count > elems)
 503                 count = elems;
 504         for (i = 0; i < count; i++)
 505                 array[i] = fdt32_to_cpu(cell[i]);
 506
 507         return count;
 508 }
 509
 510 const u32 *fdtdec_locate_array(const void *blob, int node,
 511                                const char *prop_name, int count)
 512 {
 513         const u32 *cell;
 514         int err;
 515
 516         cell = get_prop_check_min_len(blob, node, prop_name,
 517                                       sizeof(u32) * count, &err);
 518         return err ? NULL : cell;
 519 }
 520
 521 int fdtdec_get_bool(const void *blob, int node, const char *prop_name)
 522 {
 523         const s32 *cell;
 524         int len;
 525
 526         debug("%s: %s\n", __func__, prop_name);
 527         cell = fdt_getprop(blob, node, prop_name, &len);
 528         return cell != NULL;
 529 }
 530
 531 /**
 532  * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no
 533  * terminating item.
 534  *
 535  * @param blob          FDT blob to use
 536  * @param node          Node to look at
 537  * @param prop_name     Node property name
 538  * @param gpio          Array of gpio elements to fill from FDT. This will be
 539  *                      untouched if either 0 or an error is returned
 540  * @param max_count     Maximum number of elements allowed
 541  * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would
 542  * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing.
 543  */
 544 int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name,
 545                 struct fdt_gpio_state *gpio, int max_count)
 546 {
 547         const struct fdt_property *prop;
 548         const u32 *cell;
 549         const char *name;
 550         int len, i;
 551
 552         debug("%s: %s\n", __func__, prop_name);
 553         assert(max_count > 0);
 554         prop = fdt_get_property(blob, node, prop_name, &len);
 555         if (!prop) {
 556                 debug("%s: property '%s' missing\n", __func__, prop_name);
 557                 return -FDT_ERR_NOTFOUND;
 558         }
 559
 560         /* We will use the name to tag the GPIO */
 561         name = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
 562         cell = (u32 *)prop->data;
 563         len /= sizeof(u32) * 3;         /* 3 cells per GPIO record */
 564         if (len > max_count) {
 565                 debug(" %s: too many GPIOs / cells for "
 566                         "property '%s'\n", __func__, prop_name);
 567                 return -FDT_ERR_BADLAYOUT;
 568         }
 569
 570         /* Read out the GPIO data from the cells */
 571         for (i = 0; i < len; i++, cell += 3) {
 572                 gpio[i].gpio = fdt32_to_cpu(cell[1]);
 573                 gpio[i].flags = fdt32_to_cpu(cell[2]);
 574                 gpio[i].name = name;
 575         }
 576
 577         return len;
 578 }
 579
 580 int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name,
 581                 struct fdt_gpio_state *gpio)
 582 {
 583         int err;
 584
 585         debug("%s: %s\n", __func__, prop_name);
 586         gpio->gpio = FDT_GPIO_NONE;
 587         gpio->name = NULL;
 588         err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1);
 589         return err == 1 ? 0 : err;
 590 }
 591
 592 int fdtdec_get_gpio(struct fdt_gpio_state *gpio)
 593 {
 594         int val;
 595
 596         if (!fdt_gpio_isvalid(gpio))
 597                 return -1;
 598
 599         val = gpio_get_value(gpio->gpio);
 600         return gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val;
 601 }
 602
 603 int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val)
 604 {
 605         if (!fdt_gpio_isvalid(gpio))
 606                 return -1;
 607
 608         val = gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val;
 609         return gpio_set_value(gpio->gpio, val);
 610 }
 611
 612 int fdtdec_setup_gpio(struct fdt_gpio_state *gpio)
 613 {
 614         /*
 615          * Return success if there is no GPIO defined. This is used for
 616          * optional GPIOs)
 617          */
 618         if (!fdt_gpio_isvalid(gpio))
 619                 return 0;
 620
 621         if (gpio_request(gpio->gpio, gpio->name))
 622                 return -1;
 623         return 0;
 624 }
 625
 626 int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
 627                 u8 *array, int count)
 628 {
 629         const u8 *cell;
 630         int err;
 631
 632         cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
 633         if (!err)
 634                 memcpy(array, cell, count);
 635         return err;
 636 }
 637
 638 const u8 *fdtdec_locate_byte_array(const void *blob, int node,
 639                              const char *prop_name, int count)
 640 {
 641         const u8 *cell;
 642         int err;
 643
 644         cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
 645         if (err)
 646                 return NULL;
 647         return cell;
 648 }
 649
 650 int fdtdec_get_config_int(const void *blob, const char *prop_name,
 651                 int default_val)
 652 {
 653         int config_node;
 654
 655         debug("%s: %s\n", __func__, prop_name);
 656         config_node = fdt_path_offset(blob, "/config");
 657         if (config_node < 0)
 658                 return default_val;
 659         return fdtdec_get_int(blob, config_node, prop_name, default_val);
 660 }
 661
 662 int fdtdec_get_config_bool(const void *blob, const char *prop_name)
 663 {
 664         int config_node;
 665         const void *prop;
 666
 667         debug("%s: %s\n", __func__, prop_name);
 668         config_node = fdt_path_offset(blob, "/config");
 669         if (config_node < 0)
 670                 return 0;
 671         prop = fdt_get_property(blob, config_node, prop_name, NULL);
 672
 673         return prop != NULL;
 674 }
 675
 676 char *fdtdec_get_config_string(const void *blob, const char *prop_name)
 677 {
 678         const char *nodep;
 679         int nodeoffset;
 680         int len;
 681
 682         debug("%s: %s\n", __func__, prop_name);
 683         nodeoffset = fdt_path_offset(blob, "/config");
 684         if (nodeoffset < 0)
 685                 return NULL;
 686
 687         nodep = fdt_getprop(blob, nodeoffset, prop_name, &len);
 688         if (!nodep)
 689                 return NULL;
 690
 691         return (char *)nodep;
 692 }
 693
 694 int fdtdec_decode_region(const void *blob, int node, const char *prop_name,
 695                          fdt_addr_t *basep, fdt_size_t *sizep)
 696 {
 697         const fdt_addr_t *cell;
 698         int len;
 699
 700         debug("%s: %s: %s\n", __func__, fdt_get_name(blob, node, NULL),
 701               prop_name);
 702         cell = fdt_getprop(blob, node, prop_name, &len);
 703         if (!cell || (len < sizeof(fdt_addr_t) * 2)) {
 704                 debug("cell=%p, len=%d\n", cell, len);
 705                 return -1;
 706         }
 707
 708         *basep = fdt_addr_to_cpu(*cell);
 709         *sizep = fdt_size_to_cpu(cell[1]);
 710         debug("%s: base=%08lx, size=%lx\n", __func__, (ulong)*basep,
 711               (ulong)*sizep);
 712
 713         return 0;
 714 }
 715
 716 /**
 717  * Read a flash entry from the fdt
 718  *
 719  * @param blob          FDT blob
 720  * @param node          Offset of node to read
 721  * @param name          Name of node being read
 722  * @param entry         Place to put offset and size of this node
 723  * @return 0 if ok, -ve on error
 724  */
 725 int fdtdec_read_fmap_entry(const void *blob, int node, const char *name,
 726                            struct fmap_entry *entry)
 727 {
 728         const char *prop;
 729         u32 reg[2];
 730
 731         if (fdtdec_get_int_array(blob, node, "reg", reg, 2)) {
 732                 debug("Node '%s' has bad/missing 'reg' property\n", name);
 733                 return -FDT_ERR_NOTFOUND;
 734         }
 735         entry->offset = reg[0];
 736         entry->length = reg[1];
 737         entry->used = fdtdec_get_int(blob, node, "used", entry->length);
 738         prop = fdt_getprop(blob, node, "compress", NULL);
 739         entry->compress_algo = prop && !strcmp(prop, "lzo") ?
 740                 FMAP_COMPRESS_LZO : FMAP_COMPRESS_NONE;
 741         prop = fdt_getprop(blob, node, "hash", &entry->hash_size);
 742         entry->hash_algo = prop ? FMAP_HASH_SHA256 : FMAP_HASH_NONE;
 743         entry->hash = (uint8_t *)prop;
 744
 745         return 0;
 746 }
 747
 748 static u64 fdtdec_get_number(const fdt32_t *ptr, unsigned int cells)
 749 {
 750         u64 number = 0;
 751
 752         while (cells--)
 753                 number = (number << 32) | fdt32_to_cpu(*ptr++);
 754
 755         return number;
 756 }
 757
 758 int fdt_get_resource(const void *fdt, int node, const char *property,
 759                      unsigned int index, struct fdt_resource *res)
 760 {
 761         const fdt32_t *ptr, *end;
 762         int na, ns, len, parent;
 763         unsigned int i = 0;
 764
 765         parent = fdt_parent_offset(fdt, node);
 766         if (parent < 0)
 767                 return parent;
 768
 769         na = fdt_address_cells(fdt, parent);
 770         ns = fdt_size_cells(fdt, parent);
 771
 772         ptr = fdt_getprop(fdt, node, property, &len);
 773         if (!ptr)
 774                 return len;
 775
 776         end = ptr + len / sizeof(*ptr);
 777
 778         while (ptr + na + ns <= end) {
 779                 if (i == index) {
 780                         res->start = res->end = fdtdec_get_number(ptr, na);
 781                         res->end += fdtdec_get_number(&ptr[na], ns) - 1;
 782                         return 0;
 783                 }
 784
 785                 ptr += na + ns;
 786                 i++;
 787         }
 788
 789         return -FDT_ERR_NOTFOUND;
 790 }
 791
 792 int fdt_get_named_resource(const void *fdt, int node, const char *property,
 793                            const char *prop_names, const char *name,
 794                            struct fdt_resource *res)
 795 {
 796         int index;
 797
 798         index = fdt_find_string(fdt, node, prop_names, name);
 799         if (index < 0)
 800                 return index;
 801
 802         return fdt_get_resource(fdt, node, property, index, res);
 803 }
 804
 805 int fdtdec_pci_get_bdf(const void *fdt, int node, int *bdf)
 806 {
 807         const fdt32_t *prop;
 808         int len;
 809
 810         prop = fdt_getprop(fdt, node, "reg", &len);
 811         if (!prop)
 812                 return len;
 813
 814         *bdf = fdt32_to_cpu(*prop) & 0xffffff;
 815
 816         return 0;
 817 }
 818
 819 int fdtdec_decode_memory_region(const void *blob, int config_node,
 820                                 const char *mem_type, const char *suffix,
 821                                 fdt_addr_t *basep, fdt_size_t *sizep)
 822 {
 823         char prop_name[50];
 824         const char *mem;
 825         fdt_size_t size, offset_size;
 826         fdt_addr_t base, offset;
 827         int node;
 828
 829         if (config_node == -1) {
 830                 config_node = fdt_path_offset(blob, "/config");
 831                 if (config_node < 0) {
 832                         debug("%s: Cannot find /config node\n", __func__);
 833                         return -ENOENT;
 834                 }
 835         }
 836         if (!suffix)
 837                 suffix = "";
 838
 839         snprintf(prop_name, sizeof(prop_name), "%s-memory%s", mem_type,
 840                  suffix);
 841         mem = fdt_getprop(blob, config_node, prop_name, NULL);
 842         if (!mem) {
 843                 debug("%s: No memory type for '%s', using /memory\n", __func__,
 844                       prop_name);
 845                 mem = "/memory";
 846         }
 847
 848         node = fdt_path_offset(blob, mem);
 849         if (node < 0) {
 850                 debug("%s: Failed to find node '%s': %s\n", __func__, mem,
 851                       fdt_strerror(node));
 852                 return -ENOENT;
 853         }
 854
 855         /*
 856          * Not strictly correct - the memory may have multiple banks. We just
 857          * use the first
 858          */
 859         if (fdtdec_decode_region(blob, node, "reg", &base, &size)) {
 860                 debug("%s: Failed to decode memory region %s\n", __func__,
 861                       mem);
 862                 return -EINVAL;
 863         }
 864
 865         snprintf(prop_name, sizeof(prop_name), "%s-offset%s", mem_type,
 866                  suffix);
 867         if (fdtdec_decode_region(blob, config_node, prop_name, &offset,
 868                                  &offset_size)) {
 869                 debug("%s: Failed to decode memory region '%s'\n", __func__,
 870                       prop_name);
 871                 return -EINVAL;
 872         }
 873
 874         *basep = base + offset;
 875         *sizep = offset_size;
 876
 877         return 0;
 878 }
 879 #endif