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