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