fdtdec.c 16 KB

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