mmc.c 8.3 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. __weak int mmc_get_env_dev(void)
  22. {
  23. return CONFIG_SYS_MMC_ENV_DEV;
  24. }
  25. #if CONFIG_IS_ENABLED(OF_CONTROL)
  26. static inline int mmc_offset_try_partition(const char *str, int copy, s64 *val)
  27. {
  28. struct disk_partition info;
  29. struct blk_desc *desc;
  30. int len, i, ret;
  31. char dev_str[4];
  32. snprintf(dev_str, sizeof(dev_str), "%d", mmc_get_env_dev());
  33. ret = blk_get_device_by_str("mmc", dev_str, &desc);
  34. if (ret < 0)
  35. return (ret);
  36. for (i = 1;;i++) {
  37. ret = part_get_info(desc, i, &info);
  38. if (ret < 0)
  39. return ret;
  40. if (!strncmp((const char *)info.name, str, sizeof(str)))
  41. break;
  42. }
  43. /* round up to info.blksz */
  44. len = DIV_ROUND_UP(CONFIG_ENV_SIZE, info.blksz);
  45. /* use the top of the partion for the environment */
  46. *val = (info.start + info.size - (1 + copy) * len) * info.blksz;
  47. return 0;
  48. }
  49. static inline s64 mmc_offset(int copy)
  50. {
  51. const struct {
  52. const char *offset_redund;
  53. const char *partition;
  54. const char *offset;
  55. } dt_prop = {
  56. .offset_redund = "u-boot,mmc-env-offset-redundant",
  57. .partition = "u-boot,mmc-env-partition",
  58. .offset = "u-boot,mmc-env-offset",
  59. };
  60. s64 val = 0, defvalue;
  61. const char *propname;
  62. const char *str;
  63. int err;
  64. /* look for the partition in mmc CONFIG_SYS_MMC_ENV_DEV */
  65. str = fdtdec_get_config_string(gd->fdt_blob, dt_prop.partition);
  66. if (str) {
  67. /* try to place the environment at end of the partition */
  68. err = mmc_offset_try_partition(str, copy, &val);
  69. if (!err)
  70. return val;
  71. }
  72. defvalue = CONFIG_ENV_OFFSET;
  73. propname = dt_prop.offset;
  74. #if defined(CONFIG_ENV_OFFSET_REDUND)
  75. if (copy) {
  76. defvalue = CONFIG_ENV_OFFSET_REDUND;
  77. propname = dt_prop.offset_redund;
  78. }
  79. #endif
  80. return fdtdec_get_config_int(gd->fdt_blob, propname, defvalue);
  81. }
  82. #else
  83. static inline s64 mmc_offset(int copy)
  84. {
  85. s64 offset = CONFIG_ENV_OFFSET;
  86. #if defined(CONFIG_ENV_OFFSET_REDUND)
  87. if (copy)
  88. offset = CONFIG_ENV_OFFSET_REDUND;
  89. #endif
  90. return offset;
  91. }
  92. #endif
  93. __weak int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr)
  94. {
  95. s64 offset = mmc_offset(copy);
  96. if (offset < 0)
  97. offset += mmc->capacity;
  98. *env_addr = offset;
  99. return 0;
  100. }
  101. #ifdef CONFIG_SYS_MMC_ENV_PART
  102. __weak uint mmc_get_env_part(struct mmc *mmc)
  103. {
  104. return CONFIG_SYS_MMC_ENV_PART;
  105. }
  106. static unsigned char env_mmc_orig_hwpart;
  107. static int mmc_set_env_part(struct mmc *mmc)
  108. {
  109. uint part = mmc_get_env_part(mmc);
  110. int dev = mmc_get_env_dev();
  111. int ret = 0;
  112. env_mmc_orig_hwpart = mmc_get_blk_desc(mmc)->hwpart;
  113. ret = blk_select_hwpart_devnum(IF_TYPE_MMC, dev, part);
  114. if (ret)
  115. puts("MMC partition switch failed\n");
  116. return ret;
  117. }
  118. #else
  119. static inline int mmc_set_env_part(struct mmc *mmc) {return 0; };
  120. #endif
  121. static const char *init_mmc_for_env(struct mmc *mmc)
  122. {
  123. if (!mmc)
  124. return "No MMC card found";
  125. #if CONFIG_IS_ENABLED(BLK)
  126. struct udevice *dev;
  127. if (blk_get_from_parent(mmc->dev, &dev))
  128. return "No block device";
  129. #else
  130. if (mmc_init(mmc))
  131. return "MMC init failed";
  132. #endif
  133. if (mmc_set_env_part(mmc))
  134. return "MMC partition switch failed";
  135. return NULL;
  136. }
  137. static void fini_mmc_for_env(struct mmc *mmc)
  138. {
  139. #ifdef CONFIG_SYS_MMC_ENV_PART
  140. int dev = mmc_get_env_dev();
  141. blk_select_hwpart_devnum(IF_TYPE_MMC, dev, env_mmc_orig_hwpart);
  142. #endif
  143. }
  144. #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_SPL_BUILD)
  145. static inline int write_env(struct mmc *mmc, unsigned long size,
  146. unsigned long offset, const void *buffer)
  147. {
  148. uint blk_start, blk_cnt, n;
  149. struct blk_desc *desc = mmc_get_blk_desc(mmc);
  150. blk_start = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
  151. blk_cnt = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
  152. n = blk_dwrite(desc, blk_start, blk_cnt, (u_char *)buffer);
  153. return (n == blk_cnt) ? 0 : -1;
  154. }
  155. static int env_mmc_save(void)
  156. {
  157. ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
  158. int dev = mmc_get_env_dev();
  159. struct mmc *mmc = find_mmc_device(dev);
  160. u32 offset;
  161. int ret, copy = 0;
  162. const char *errmsg;
  163. errmsg = init_mmc_for_env(mmc);
  164. if (errmsg) {
  165. printf("%s\n", errmsg);
  166. return 1;
  167. }
  168. ret = env_export(env_new);
  169. if (ret)
  170. goto fini;
  171. #ifdef CONFIG_ENV_OFFSET_REDUND
  172. if (gd->env_valid == ENV_VALID)
  173. copy = 1;
  174. #endif
  175. if (mmc_get_env_addr(mmc, copy, &offset)) {
  176. ret = 1;
  177. goto fini;
  178. }
  179. printf("Writing to %sMMC(%d)... ", copy ? "redundant " : "", dev);
  180. if (write_env(mmc, CONFIG_ENV_SIZE, offset, (u_char *)env_new)) {
  181. puts("failed\n");
  182. ret = 1;
  183. goto fini;
  184. }
  185. ret = 0;
  186. #ifdef CONFIG_ENV_OFFSET_REDUND
  187. gd->env_valid = gd->env_valid == ENV_REDUND ? ENV_VALID : ENV_REDUND;
  188. #endif
  189. fini:
  190. fini_mmc_for_env(mmc);
  191. return ret;
  192. }
  193. #if defined(CONFIG_CMD_ERASEENV)
  194. static inline int erase_env(struct mmc *mmc, unsigned long size,
  195. unsigned long offset)
  196. {
  197. uint blk_start, blk_cnt, n;
  198. struct blk_desc *desc = mmc_get_blk_desc(mmc);
  199. blk_start = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
  200. blk_cnt = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
  201. n = blk_derase(desc, blk_start, blk_cnt);
  202. printf("%d blocks erased: %s\n", n, (n == blk_cnt) ? "OK" : "ERROR");
  203. return (n == blk_cnt) ? 0 : 1;
  204. }
  205. static int env_mmc_erase(void)
  206. {
  207. int dev = mmc_get_env_dev();
  208. struct mmc *mmc = find_mmc_device(dev);
  209. int ret, copy = 0;
  210. u32 offset;
  211. const char *errmsg;
  212. errmsg = init_mmc_for_env(mmc);
  213. if (errmsg) {
  214. printf("%s\n", errmsg);
  215. return 1;
  216. }
  217. if (mmc_get_env_addr(mmc, copy, &offset))
  218. return CMD_RET_FAILURE;
  219. ret = erase_env(mmc, CONFIG_ENV_SIZE, offset);
  220. #ifdef CONFIG_ENV_OFFSET_REDUND
  221. copy = 1;
  222. if (mmc_get_env_addr(mmc, copy, &offset))
  223. return CMD_RET_FAILURE;
  224. ret |= erase_env(mmc, CONFIG_ENV_SIZE, offset);
  225. #endif
  226. return ret;
  227. }
  228. #endif /* CONFIG_CMD_ERASEENV */
  229. #endif /* CONFIG_CMD_SAVEENV && !CONFIG_SPL_BUILD */
  230. static inline int read_env(struct mmc *mmc, unsigned long size,
  231. unsigned long offset, const void *buffer)
  232. {
  233. uint blk_start, blk_cnt, n;
  234. struct blk_desc *desc = mmc_get_blk_desc(mmc);
  235. blk_start = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
  236. blk_cnt = ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len;
  237. n = blk_dread(desc, blk_start, blk_cnt, (uchar *)buffer);
  238. return (n == blk_cnt) ? 0 : -1;
  239. }
  240. #ifdef CONFIG_ENV_OFFSET_REDUND
  241. static int env_mmc_load(void)
  242. {
  243. #if !defined(ENV_IS_EMBEDDED)
  244. struct mmc *mmc;
  245. u32 offset1, offset2;
  246. int read1_fail = 0, read2_fail = 0;
  247. int ret;
  248. int dev = mmc_get_env_dev();
  249. const char *errmsg = NULL;
  250. ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env1, 1);
  251. ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env2, 1);
  252. mmc_initialize(NULL);
  253. mmc = find_mmc_device(dev);
  254. errmsg = init_mmc_for_env(mmc);
  255. if (errmsg) {
  256. ret = -EIO;
  257. goto err;
  258. }
  259. if (mmc_get_env_addr(mmc, 0, &offset1) ||
  260. mmc_get_env_addr(mmc, 1, &offset2)) {
  261. ret = -EIO;
  262. goto fini;
  263. }
  264. read1_fail = read_env(mmc, CONFIG_ENV_SIZE, offset1, tmp_env1);
  265. read2_fail = read_env(mmc, CONFIG_ENV_SIZE, offset2, tmp_env2);
  266. ret = env_import_redund((char *)tmp_env1, read1_fail, (char *)tmp_env2,
  267. read2_fail, H_EXTERNAL);
  268. fini:
  269. fini_mmc_for_env(mmc);
  270. err:
  271. if (ret)
  272. env_set_default(errmsg, 0);
  273. #endif
  274. return ret;
  275. }
  276. #else /* ! CONFIG_ENV_OFFSET_REDUND */
  277. static int env_mmc_load(void)
  278. {
  279. #if !defined(ENV_IS_EMBEDDED)
  280. ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
  281. struct mmc *mmc;
  282. u32 offset;
  283. int ret;
  284. int dev = mmc_get_env_dev();
  285. const char *errmsg;
  286. env_t *ep = NULL;
  287. mmc = find_mmc_device(dev);
  288. errmsg = init_mmc_for_env(mmc);
  289. if (errmsg) {
  290. ret = -EIO;
  291. goto err;
  292. }
  293. if (mmc_get_env_addr(mmc, 0, &offset)) {
  294. ret = -EIO;
  295. goto fini;
  296. }
  297. if (read_env(mmc, CONFIG_ENV_SIZE, offset, buf)) {
  298. errmsg = "!read failed";
  299. ret = -EIO;
  300. goto fini;
  301. }
  302. ret = env_import(buf, 1, H_EXTERNAL);
  303. if (!ret) {
  304. ep = (env_t *)buf;
  305. gd->env_addr = (ulong)&ep->data;
  306. }
  307. fini:
  308. fini_mmc_for_env(mmc);
  309. err:
  310. if (ret)
  311. env_set_default(errmsg, 0);
  312. #endif
  313. return ret;
  314. }
  315. #endif /* CONFIG_ENV_OFFSET_REDUND */
  316. U_BOOT_ENV_LOCATION(mmc) = {
  317. .location = ENVL_MMC,
  318. ENV_NAME("MMC")
  319. .load = env_mmc_load,
  320. #ifndef CONFIG_SPL_BUILD
  321. .save = env_save_ptr(env_mmc_save),
  322. #if defined(CONFIG_CMD_ERASEENV)
  323. .erase = env_mmc_erase,
  324. #endif
  325. #endif
  326. };