mmc.c 8.1 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * (C) Copyright 2008-2011 Freescale Semiconductor, Inc.
  4. */
  5. /* #define DEBUG */
  6. #include <common.h>
  7. #include <command.h>
  8. #include <env.h>
  9. #include <env_internal.h>
  10. #include <fdtdec.h>
  11. #include <linux/stddef.h>
  12. #include <malloc.h>
  13. #include <memalign.h>
  14. #include <mmc.h>
  15. #include <part.h>
  16. #include <search.h>
  17. #include <errno.h>
  18. #define __STR(X) #X
  19. #define STR(X) __STR(X)
  20. DECLARE_GLOBAL_DATA_PTR;
  21. #if CONFIG_IS_ENABLED(OF_CONTROL)
  22. static inline int mmc_offset_try_partition(const char *str, s64 *val)
  23. {
  24. disk_partition_t info;
  25. struct blk_desc *desc;
  26. int len, i, ret;
  27. ret = blk_get_device_by_str("mmc", STR(CONFIG_SYS_MMC_ENV_DEV), &desc);
  28. if (ret < 0)
  29. return (ret);
  30. for (i = 1;;i++) {
  31. ret = part_get_info(desc, i, &info);
  32. if (ret < 0)
  33. return ret;
  34. if (!strncmp((const char *)info.name, str, sizeof(str)))
  35. break;
  36. }
  37. /* round up to info.blksz */
  38. len = (CONFIG_ENV_SIZE + info.blksz - 1) & ~(info.blksz - 1);
  39. /* use the top of the partion for the environment */
  40. *val = (info.start + info.size - 1) - len / info.blksz;
  41. return 0;
  42. }
  43. static inline s64 mmc_offset(int copy)
  44. {
  45. const struct {
  46. const char *offset_redund;
  47. const char *partition;
  48. const char *offset;
  49. } dt_prop = {
  50. .offset_redund = "u-boot,mmc-env-offset-redundant",
  51. .partition = "u-boot,mmc-env-partition",
  52. .offset = "u-boot,mmc-env-offset",
  53. };
  54. s64 val = 0, defvalue;
  55. const char *propname;
  56. const char *str;
  57. int err;
  58. /* look for the partition in mmc CONFIG_SYS_MMC_ENV_DEV */
  59. str = fdtdec_get_config_string(gd->fdt_blob, dt_prop.partition);
  60. if (str) {
  61. /* try to place the environment at end of the partition */
  62. err = mmc_offset_try_partition(str, &val);
  63. if (!err)
  64. return val;
  65. }
  66. defvalue = CONFIG_ENV_OFFSET;
  67. propname = dt_prop.offset;
  68. #if defined(CONFIG_ENV_OFFSET_REDUND)
  69. if (copy) {
  70. defvalue = CONFIG_ENV_OFFSET_REDUND;
  71. propname = dt_prop.offset_redund;
  72. }
  73. #endif
  74. return fdtdec_get_config_int(gd->fdt_blob, propname, defvalue);
  75. }
  76. #else
  77. static inline s64 mmc_offset(int copy)
  78. {
  79. s64 offset = CONFIG_ENV_OFFSET;
  80. #if defined(CONFIG_ENV_OFFSET_REDUND)
  81. if (copy)
  82. offset = CONFIG_ENV_OFFSET_REDUND;
  83. #endif
  84. return offset;
  85. }
  86. #endif
  87. __weak int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr)
  88. {
  89. s64 offset = mmc_offset(copy);
  90. if (offset < 0)
  91. offset += mmc->capacity;
  92. *env_addr = offset;
  93. return 0;
  94. }
  95. __weak int mmc_get_env_dev(void)
  96. {
  97. return CONFIG_SYS_MMC_ENV_DEV;
  98. }
  99. #ifdef CONFIG_SYS_MMC_ENV_PART
  100. __weak uint mmc_get_env_part(struct mmc *mmc)
  101. {
  102. return CONFIG_SYS_MMC_ENV_PART;
  103. }
  104. static unsigned char env_mmc_orig_hwpart;
  105. static int mmc_set_env_part(struct mmc *mmc)
  106. {
  107. uint part = mmc_get_env_part(mmc);
  108. int dev = mmc_get_env_dev();
  109. int ret = 0;
  110. env_mmc_orig_hwpart = mmc_get_blk_desc(mmc)->hwpart;
  111. ret = blk_select_hwpart_devnum(IF_TYPE_MMC, dev, part);
  112. if (ret)
  113. puts("MMC partition switch failed\n");
  114. return ret;
  115. }
  116. #else
  117. static inline int mmc_set_env_part(struct mmc *mmc) {return 0; };
  118. #endif
  119. static const char *init_mmc_for_env(struct mmc *mmc)
  120. {
  121. if (!mmc)
  122. return "No MMC card found";
  123. #if CONFIG_IS_ENABLED(BLK)
  124. struct udevice *dev;
  125. if (blk_get_from_parent(mmc->dev, &dev))
  126. return "No block device";
  127. #else
  128. if (mmc_init(mmc))
  129. return "MMC init failed";
  130. #endif
  131. if (mmc_set_env_part(mmc))
  132. return "MMC partition switch failed";
  133. return NULL;
  134. }
  135. static void fini_mmc_for_env(struct mmc *mmc)
  136. {
  137. #ifdef CONFIG_SYS_MMC_ENV_PART
  138. int dev = mmc_get_env_dev();
  139. blk_select_hwpart_devnum(IF_TYPE_MMC, dev, env_mmc_orig_hwpart);
  140. #endif
  141. }
  142. #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_SPL_BUILD)
  143. static inline int write_env(struct mmc *mmc, unsigned long size,
  144. unsigned long offset, const void *buffer)
  145. {
  146. uint blk_start, blk_cnt, n;
  147. struct blk_desc *desc = mmc_get_blk_desc(mmc);
  148. blk_start = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
  149. blk_cnt = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
  150. n = blk_dwrite(desc, blk_start, blk_cnt, (u_char *)buffer);
  151. return (n == blk_cnt) ? 0 : -1;
  152. }
  153. static int env_mmc_save(void)
  154. {
  155. ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
  156. int dev = mmc_get_env_dev();
  157. struct mmc *mmc = find_mmc_device(dev);
  158. u32 offset;
  159. int ret, copy = 0;
  160. const char *errmsg;
  161. errmsg = init_mmc_for_env(mmc);
  162. if (errmsg) {
  163. printf("%s\n", errmsg);
  164. return 1;
  165. }
  166. ret = env_export(env_new);
  167. if (ret)
  168. goto fini;
  169. #ifdef CONFIG_ENV_OFFSET_REDUND
  170. if (gd->env_valid == ENV_VALID)
  171. copy = 1;
  172. #endif
  173. if (mmc_get_env_addr(mmc, copy, &offset)) {
  174. ret = 1;
  175. goto fini;
  176. }
  177. printf("Writing to %sMMC(%d)... ", copy ? "redundant " : "", dev);
  178. if (write_env(mmc, CONFIG_ENV_SIZE, offset, (u_char *)env_new)) {
  179. puts("failed\n");
  180. ret = 1;
  181. goto fini;
  182. }
  183. ret = 0;
  184. #ifdef CONFIG_ENV_OFFSET_REDUND
  185. gd->env_valid = gd->env_valid == ENV_REDUND ? ENV_VALID : ENV_REDUND;
  186. #endif
  187. fini:
  188. fini_mmc_for_env(mmc);
  189. return ret;
  190. }
  191. #if defined(CONFIG_CMD_ERASEENV)
  192. static inline int erase_env(struct mmc *mmc, unsigned long size,
  193. unsigned long offset)
  194. {
  195. uint blk_start, blk_cnt, n;
  196. struct blk_desc *desc = mmc_get_blk_desc(mmc);
  197. blk_start = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
  198. blk_cnt = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
  199. n = blk_derase(desc, blk_start, blk_cnt);
  200. printf("%d blocks erased: %s\n", n, (n == blk_cnt) ? "OK" : "ERROR");
  201. return (n == blk_cnt) ? 0 : 1;
  202. }
  203. static int env_mmc_erase(void)
  204. {
  205. int dev = mmc_get_env_dev();
  206. struct mmc *mmc = find_mmc_device(dev);
  207. int ret, copy = 0;
  208. u32 offset;
  209. const char *errmsg;
  210. errmsg = init_mmc_for_env(mmc);
  211. if (errmsg) {
  212. printf("%s\n", errmsg);
  213. return 1;
  214. }
  215. if (mmc_get_env_addr(mmc, copy, &offset))
  216. return CMD_RET_FAILURE;
  217. ret = erase_env(mmc, CONFIG_ENV_SIZE, offset);
  218. #ifdef CONFIG_ENV_OFFSET_REDUND
  219. copy = 1;
  220. if (mmc_get_env_addr(mmc, copy, &offset))
  221. return CMD_RET_FAILURE;
  222. ret |= erase_env(mmc, CONFIG_ENV_SIZE, offset);
  223. #endif
  224. return ret;
  225. }
  226. #endif /* CONFIG_CMD_ERASEENV */
  227. #endif /* CONFIG_CMD_SAVEENV && !CONFIG_SPL_BUILD */
  228. static inline int read_env(struct mmc *mmc, unsigned long size,
  229. unsigned long offset, const void *buffer)
  230. {
  231. uint blk_start, blk_cnt, n;
  232. struct blk_desc *desc = mmc_get_blk_desc(mmc);
  233. blk_start = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
  234. blk_cnt = ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len;
  235. n = blk_dread(desc, blk_start, blk_cnt, (uchar *)buffer);
  236. return (n == blk_cnt) ? 0 : -1;
  237. }
  238. #ifdef CONFIG_ENV_OFFSET_REDUND
  239. static int env_mmc_load(void)
  240. {
  241. #if !defined(ENV_IS_EMBEDDED)
  242. struct mmc *mmc;
  243. u32 offset1, offset2;
  244. int read1_fail = 0, read2_fail = 0;
  245. int ret;
  246. int dev = mmc_get_env_dev();
  247. const char *errmsg = NULL;
  248. ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env1, 1);
  249. ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env2, 1);
  250. mmc_initialize(NULL);
  251. mmc = find_mmc_device(dev);
  252. errmsg = init_mmc_for_env(mmc);
  253. if (errmsg) {
  254. ret = -EIO;
  255. goto err;
  256. }
  257. if (mmc_get_env_addr(mmc, 0, &offset1) ||
  258. mmc_get_env_addr(mmc, 1, &offset2)) {
  259. ret = -EIO;
  260. goto fini;
  261. }
  262. read1_fail = read_env(mmc, CONFIG_ENV_SIZE, offset1, tmp_env1);
  263. read2_fail = read_env(mmc, CONFIG_ENV_SIZE, offset2, tmp_env2);
  264. ret = env_import_redund((char *)tmp_env1, read1_fail, (char *)tmp_env2,
  265. read2_fail);
  266. fini:
  267. fini_mmc_for_env(mmc);
  268. err:
  269. if (ret)
  270. env_set_default(errmsg, 0);
  271. #endif
  272. return ret;
  273. }
  274. #else /* ! CONFIG_ENV_OFFSET_REDUND */
  275. static int env_mmc_load(void)
  276. {
  277. #if !defined(ENV_IS_EMBEDDED)
  278. ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
  279. struct mmc *mmc;
  280. u32 offset;
  281. int ret;
  282. int dev = mmc_get_env_dev();
  283. const char *errmsg;
  284. mmc = find_mmc_device(dev);
  285. errmsg = init_mmc_for_env(mmc);
  286. if (errmsg) {
  287. ret = -EIO;
  288. goto err;
  289. }
  290. if (mmc_get_env_addr(mmc, 0, &offset)) {
  291. ret = -EIO;
  292. goto fini;
  293. }
  294. if (read_env(mmc, CONFIG_ENV_SIZE, offset, buf)) {
  295. errmsg = "!read failed";
  296. ret = -EIO;
  297. goto fini;
  298. }
  299. ret = env_import(buf, 1);
  300. fini:
  301. fini_mmc_for_env(mmc);
  302. err:
  303. if (ret)
  304. env_set_default(errmsg, 0);
  305. #endif
  306. return ret;
  307. }
  308. #endif /* CONFIG_ENV_OFFSET_REDUND */
  309. U_BOOT_ENV_LOCATION(mmc) = {
  310. .location = ENVL_MMC,
  311. ENV_NAME("MMC")
  312. .load = env_mmc_load,
  313. #ifndef CONFIG_SPL_BUILD
  314. .save = env_save_ptr(env_mmc_save),
  315. #if defined(CONFIG_CMD_ERASEENV)
  316. .erase = env_mmc_erase,
  317. #endif
  318. #endif
  319. };