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