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. #include <dm/ofnode.h>
  20. #define __STR(X) #X
  21. #define STR(X) __STR(X)
  22. DECLARE_GLOBAL_DATA_PTR;
  23. #if CONFIG_IS_ENABLED(OF_CONTROL)
  24. static inline int mmc_offset_try_partition(const char *str, int copy, s64 *val)
  25. {
  26. struct disk_partition info;
  27. struct blk_desc *desc;
  28. int len, i, ret;
  29. char dev_str[4];
  30. snprintf(dev_str, sizeof(dev_str), "%d", mmc_get_env_dev());
  31. ret = blk_get_device_by_str("mmc", dev_str, &desc);
  32. if (ret < 0)
  33. return (ret);
  34. for (i = 1;;i++) {
  35. ret = part_get_info(desc, i, &info);
  36. if (ret < 0)
  37. return ret;
  38. if (!strncmp((const char *)info.name, str, sizeof(info.name)))
  39. break;
  40. }
  41. /* round up to info.blksz */
  42. len = DIV_ROUND_UP(CONFIG_ENV_SIZE, info.blksz);
  43. /* use the top of the partion for the environment */
  44. *val = (info.start + info.size - (1 + copy) * len) * info.blksz;
  45. return 0;
  46. }
  47. static inline s64 mmc_offset(int copy)
  48. {
  49. const struct {
  50. const char *offset_redund;
  51. const char *partition;
  52. const char *offset;
  53. } dt_prop = {
  54. .offset_redund = "u-boot,mmc-env-offset-redundant",
  55. .partition = "u-boot,mmc-env-partition",
  56. .offset = "u-boot,mmc-env-offset",
  57. };
  58. s64 val = 0, defvalue;
  59. const char *propname;
  60. const char *str;
  61. int err;
  62. /* look for the partition in mmc CONFIG_SYS_MMC_ENV_DEV */
  63. str = ofnode_conf_read_str(dt_prop.partition);
  64. if (str) {
  65. /* try to place the environment at end of the partition */
  66. err = mmc_offset_try_partition(str, copy, &val);
  67. if (!err)
  68. return val;
  69. }
  70. defvalue = CONFIG_ENV_OFFSET;
  71. propname = dt_prop.offset;
  72. #if defined(CONFIG_ENV_OFFSET_REDUND)
  73. if (copy) {
  74. defvalue = CONFIG_ENV_OFFSET_REDUND;
  75. propname = dt_prop.offset_redund;
  76. }
  77. #endif
  78. return ofnode_conf_read_int(propname, defvalue);
  79. }
  80. #else
  81. static inline s64 mmc_offset(int copy)
  82. {
  83. s64 offset = CONFIG_ENV_OFFSET;
  84. #if defined(CONFIG_ENV_OFFSET_REDUND)
  85. if (copy)
  86. offset = CONFIG_ENV_OFFSET_REDUND;
  87. #endif
  88. return offset;
  89. }
  90. #endif
  91. __weak int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr)
  92. {
  93. s64 offset = mmc_offset(copy);
  94. if (offset < 0)
  95. offset += mmc->capacity;
  96. *env_addr = offset;
  97. return 0;
  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. static inline int erase_env(struct mmc *mmc, unsigned long size,
  192. unsigned long offset)
  193. {
  194. uint blk_start, blk_cnt, n;
  195. struct blk_desc *desc = mmc_get_blk_desc(mmc);
  196. blk_start = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
  197. blk_cnt = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
  198. n = blk_derase(desc, blk_start, blk_cnt);
  199. printf("%d blocks erased: %s\n", n, (n == blk_cnt) ? "OK" : "ERROR");
  200. return (n == blk_cnt) ? 0 : 1;
  201. }
  202. static int env_mmc_erase(void)
  203. {
  204. int dev = mmc_get_env_dev();
  205. struct mmc *mmc = find_mmc_device(dev);
  206. int ret, copy = 0;
  207. u32 offset;
  208. const char *errmsg;
  209. errmsg = init_mmc_for_env(mmc);
  210. if (errmsg) {
  211. printf("%s\n", errmsg);
  212. return 1;
  213. }
  214. if (mmc_get_env_addr(mmc, copy, &offset))
  215. return CMD_RET_FAILURE;
  216. ret = erase_env(mmc, CONFIG_ENV_SIZE, offset);
  217. #ifdef CONFIG_ENV_OFFSET_REDUND
  218. copy = 1;
  219. if (mmc_get_env_addr(mmc, copy, &offset))
  220. return CMD_RET_FAILURE;
  221. ret |= erase_env(mmc, CONFIG_ENV_SIZE, offset);
  222. #endif
  223. return ret;
  224. }
  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. .erase = ENV_ERASE_PTR(env_mmc_erase)
  319. #endif
  320. };