mmc.c 8.2 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, int copy, s64 *val)
  23. {
  24. struct disk_partition info;
  25. struct blk_desc *desc;
  26. int len, i, ret;
  27. char dev_str[4];
  28. snprintf(dev_str, sizeof(dev_str), "%d", mmc_get_env_dev());
  29. ret = blk_get_device_by_str("mmc", dev_str, &desc);
  30. if (ret < 0)
  31. return (ret);
  32. for (i = 1;;i++) {
  33. ret = part_get_info(desc, i, &info);
  34. if (ret < 0)
  35. return ret;
  36. if (!strncmp((const char *)info.name, str, sizeof(info.name)))
  37. break;
  38. }
  39. /* round up to info.blksz */
  40. len = DIV_ROUND_UP(CONFIG_ENV_SIZE, info.blksz);
  41. /* use the top of the partion for the environment */
  42. *val = (info.start + info.size - (1 + copy) * len) * info.blksz;
  43. return 0;
  44. }
  45. static inline s64 mmc_offset(int copy)
  46. {
  47. const struct {
  48. const char *offset_redund;
  49. const char *partition;
  50. const char *offset;
  51. } dt_prop = {
  52. .offset_redund = "u-boot,mmc-env-offset-redundant",
  53. .partition = "u-boot,mmc-env-partition",
  54. .offset = "u-boot,mmc-env-offset",
  55. };
  56. s64 val = 0, defvalue;
  57. const char *propname;
  58. const char *str;
  59. int err;
  60. /* look for the partition in mmc CONFIG_SYS_MMC_ENV_DEV */
  61. str = fdtdec_get_config_string(gd->fdt_blob, dt_prop.partition);
  62. if (str) {
  63. /* try to place the environment at end of the partition */
  64. err = mmc_offset_try_partition(str, copy, &val);
  65. if (!err)
  66. return val;
  67. }
  68. defvalue = CONFIG_ENV_OFFSET;
  69. propname = dt_prop.offset;
  70. #if defined(CONFIG_ENV_OFFSET_REDUND)
  71. if (copy) {
  72. defvalue = CONFIG_ENV_OFFSET_REDUND;
  73. propname = dt_prop.offset_redund;
  74. }
  75. #endif
  76. return fdtdec_get_config_int(gd->fdt_blob, propname, defvalue);
  77. }
  78. #else
  79. static inline s64 mmc_offset(int copy)
  80. {
  81. s64 offset = CONFIG_ENV_OFFSET;
  82. #if defined(CONFIG_ENV_OFFSET_REDUND)
  83. if (copy)
  84. offset = CONFIG_ENV_OFFSET_REDUND;
  85. #endif
  86. return offset;
  87. }
  88. #endif
  89. __weak int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr)
  90. {
  91. s64 offset = mmc_offset(copy);
  92. if (offset < 0)
  93. offset += mmc->capacity;
  94. *env_addr = offset;
  95. return 0;
  96. }
  97. #ifdef CONFIG_SYS_MMC_ENV_PART
  98. __weak uint mmc_get_env_part(struct mmc *mmc)
  99. {
  100. return CONFIG_SYS_MMC_ENV_PART;
  101. }
  102. static unsigned char env_mmc_orig_hwpart;
  103. static int mmc_set_env_part(struct mmc *mmc)
  104. {
  105. uint part = mmc_get_env_part(mmc);
  106. int dev = mmc_get_env_dev();
  107. int ret = 0;
  108. env_mmc_orig_hwpart = mmc_get_blk_desc(mmc)->hwpart;
  109. ret = blk_select_hwpart_devnum(IF_TYPE_MMC, dev, part);
  110. if (ret)
  111. puts("MMC partition switch failed\n");
  112. return ret;
  113. }
  114. #else
  115. static inline int mmc_set_env_part(struct mmc *mmc) {return 0; };
  116. #endif
  117. static const char *init_mmc_for_env(struct mmc *mmc)
  118. {
  119. if (!mmc)
  120. return "No MMC card found";
  121. #if CONFIG_IS_ENABLED(BLK)
  122. struct udevice *dev;
  123. if (blk_get_from_parent(mmc->dev, &dev))
  124. return "No block device";
  125. #else
  126. if (mmc_init(mmc))
  127. return "MMC init failed";
  128. #endif
  129. if (mmc_set_env_part(mmc))
  130. return "MMC partition switch failed";
  131. return NULL;
  132. }
  133. static void fini_mmc_for_env(struct mmc *mmc)
  134. {
  135. #ifdef CONFIG_SYS_MMC_ENV_PART
  136. int dev = mmc_get_env_dev();
  137. blk_select_hwpart_devnum(IF_TYPE_MMC, dev, env_mmc_orig_hwpart);
  138. #endif
  139. }
  140. #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_SPL_BUILD)
  141. static inline int write_env(struct mmc *mmc, unsigned long size,
  142. unsigned long offset, const void *buffer)
  143. {
  144. uint blk_start, blk_cnt, n;
  145. struct blk_desc *desc = mmc_get_blk_desc(mmc);
  146. blk_start = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
  147. blk_cnt = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
  148. n = blk_dwrite(desc, blk_start, blk_cnt, (u_char *)buffer);
  149. return (n == blk_cnt) ? 0 : -1;
  150. }
  151. static int env_mmc_save(void)
  152. {
  153. ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
  154. int dev = mmc_get_env_dev();
  155. struct mmc *mmc = find_mmc_device(dev);
  156. u32 offset;
  157. int ret, copy = 0;
  158. const char *errmsg;
  159. errmsg = init_mmc_for_env(mmc);
  160. if (errmsg) {
  161. printf("%s\n", errmsg);
  162. return 1;
  163. }
  164. ret = env_export(env_new);
  165. if (ret)
  166. goto fini;
  167. #ifdef CONFIG_ENV_OFFSET_REDUND
  168. if (gd->env_valid == ENV_VALID)
  169. copy = 1;
  170. #endif
  171. if (mmc_get_env_addr(mmc, copy, &offset)) {
  172. ret = 1;
  173. goto fini;
  174. }
  175. printf("Writing to %sMMC(%d)... ", copy ? "redundant " : "", dev);
  176. if (write_env(mmc, CONFIG_ENV_SIZE, offset, (u_char *)env_new)) {
  177. puts("failed\n");
  178. ret = 1;
  179. goto fini;
  180. }
  181. ret = 0;
  182. #ifdef CONFIG_ENV_OFFSET_REDUND
  183. gd->env_valid = gd->env_valid == ENV_REDUND ? ENV_VALID : ENV_REDUND;
  184. #endif
  185. fini:
  186. fini_mmc_for_env(mmc);
  187. return ret;
  188. }
  189. #if defined(CONFIG_CMD_ERASEENV)
  190. static inline int erase_env(struct mmc *mmc, unsigned long size,
  191. unsigned long offset)
  192. {
  193. uint blk_start, blk_cnt, n;
  194. struct blk_desc *desc = mmc_get_blk_desc(mmc);
  195. blk_start = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
  196. blk_cnt = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
  197. n = blk_derase(desc, blk_start, blk_cnt);
  198. printf("%d blocks erased: %s\n", n, (n == blk_cnt) ? "OK" : "ERROR");
  199. return (n == blk_cnt) ? 0 : 1;
  200. }
  201. static int env_mmc_erase(void)
  202. {
  203. int dev = mmc_get_env_dev();
  204. struct mmc *mmc = find_mmc_device(dev);
  205. int ret, copy = 0;
  206. u32 offset;
  207. const char *errmsg;
  208. errmsg = init_mmc_for_env(mmc);
  209. if (errmsg) {
  210. printf("%s\n", errmsg);
  211. return 1;
  212. }
  213. if (mmc_get_env_addr(mmc, copy, &offset))
  214. return CMD_RET_FAILURE;
  215. ret = erase_env(mmc, CONFIG_ENV_SIZE, offset);
  216. #ifdef CONFIG_ENV_OFFSET_REDUND
  217. copy = 1;
  218. if (mmc_get_env_addr(mmc, copy, &offset))
  219. return CMD_RET_FAILURE;
  220. ret |= erase_env(mmc, CONFIG_ENV_SIZE, offset);
  221. #endif
  222. return ret;
  223. }
  224. #endif /* CONFIG_CMD_ERASEENV */
  225. #endif /* CONFIG_CMD_SAVEENV && !CONFIG_SPL_BUILD */
  226. static inline int read_env(struct mmc *mmc, unsigned long size,
  227. unsigned long offset, const void *buffer)
  228. {
  229. uint blk_start, blk_cnt, n;
  230. struct blk_desc *desc = mmc_get_blk_desc(mmc);
  231. blk_start = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
  232. blk_cnt = ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len;
  233. n = blk_dread(desc, blk_start, blk_cnt, (uchar *)buffer);
  234. return (n == blk_cnt) ? 0 : -1;
  235. }
  236. #ifdef CONFIG_ENV_OFFSET_REDUND
  237. static int env_mmc_load(void)
  238. {
  239. #if !defined(ENV_IS_EMBEDDED)
  240. struct mmc *mmc;
  241. u32 offset1, offset2;
  242. int read1_fail = 0, read2_fail = 0;
  243. int ret;
  244. int dev = mmc_get_env_dev();
  245. const char *errmsg = NULL;
  246. ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env1, 1);
  247. ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env2, 1);
  248. mmc_initialize(NULL);
  249. mmc = find_mmc_device(dev);
  250. errmsg = init_mmc_for_env(mmc);
  251. if (errmsg) {
  252. ret = -EIO;
  253. goto err;
  254. }
  255. if (mmc_get_env_addr(mmc, 0, &offset1) ||
  256. mmc_get_env_addr(mmc, 1, &offset2)) {
  257. ret = -EIO;
  258. goto fini;
  259. }
  260. read1_fail = read_env(mmc, CONFIG_ENV_SIZE, offset1, tmp_env1);
  261. read2_fail = read_env(mmc, CONFIG_ENV_SIZE, offset2, tmp_env2);
  262. ret = env_import_redund((char *)tmp_env1, read1_fail, (char *)tmp_env2,
  263. read2_fail, H_EXTERNAL);
  264. fini:
  265. fini_mmc_for_env(mmc);
  266. err:
  267. if (ret)
  268. env_set_default(errmsg, 0);
  269. #endif
  270. return ret;
  271. }
  272. #else /* ! CONFIG_ENV_OFFSET_REDUND */
  273. static int env_mmc_load(void)
  274. {
  275. #if !defined(ENV_IS_EMBEDDED)
  276. ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
  277. struct mmc *mmc;
  278. u32 offset;
  279. int ret;
  280. int dev = mmc_get_env_dev();
  281. const char *errmsg;
  282. env_t *ep = NULL;
  283. mmc = find_mmc_device(dev);
  284. errmsg = init_mmc_for_env(mmc);
  285. if (errmsg) {
  286. ret = -EIO;
  287. goto err;
  288. }
  289. if (mmc_get_env_addr(mmc, 0, &offset)) {
  290. ret = -EIO;
  291. goto fini;
  292. }
  293. if (read_env(mmc, CONFIG_ENV_SIZE, offset, buf)) {
  294. errmsg = "!read failed";
  295. ret = -EIO;
  296. goto fini;
  297. }
  298. ret = env_import(buf, 1, H_EXTERNAL);
  299. if (!ret) {
  300. ep = (env_t *)buf;
  301. gd->env_addr = (ulong)&ep->data;
  302. }
  303. fini:
  304. fini_mmc_for_env(mmc);
  305. err:
  306. if (ret)
  307. env_set_default(errmsg, 0);
  308. #endif
  309. return ret;
  310. }
  311. #endif /* CONFIG_ENV_OFFSET_REDUND */
  312. U_BOOT_ENV_LOCATION(mmc) = {
  313. .location = ENVL_MMC,
  314. ENV_NAME("MMC")
  315. .load = env_mmc_load,
  316. #ifndef CONFIG_SPL_BUILD
  317. .save = env_save_ptr(env_mmc_save),
  318. #if defined(CONFIG_CMD_ERASEENV)
  319. .erase = env_mmc_erase,
  320. #endif
  321. #endif
  322. };