lib/fdtdec.c

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