mmc.c 7.2 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 <environment.h>
  9. #include <fdtdec.h>
  10. #include <linux/stddef.h>
  11. #include <malloc.h>
  12. #include <memalign.h>
  13. #include <mmc.h>
  14. #include <part.h>
  15. #include <search.h>
  16. #include <errno.h>
  17. #define __STR(X) #X
  18. #define STR(X) __STR(X)
  19. #if defined(CONFIG_ENV_SIZE_REDUND) && \
  20. (CONFIG_ENV_SIZE_REDUND != CONFIG_ENV_SIZE)
  21. #error CONFIG_ENV_SIZE_REDUND should be the same as CONFIG_ENV_SIZE
  22. #endif
  23. DECLARE_GLOBAL_DATA_PTR;
  24. #if !defined(CONFIG_ENV_OFFSET)
  25. #define CONFIG_ENV_OFFSET 0
  26. #endif
  27. #if CONFIG_IS_ENABLED(OF_CONTROL)
  28. static inline int mmc_offset_try_partition(const char *str, s64 *val)
  29. {
  30. disk_partition_t info;
  31. struct blk_desc *desc;
  32. int len, i, ret;
  33. ret = blk_get_device_by_str("mmc", STR(CONFIG_SYS_MMC_ENV_DEV), &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 = (CONFIG_ENV_SIZE + info.blksz - 1) & ~(info.blksz - 1);
  45. /* use the top of the partion for the environment */
  46. *val = (info.start + info.size - 1) - 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, &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. __weak int mmc_get_env_dev(void)
  102. {
  103. return CONFIG_SYS_MMC_ENV_DEV;
  104. }
  105. #ifdef CONFIG_SYS_MMC_ENV_PART
  106. __weak uint mmc_get_env_part(struct mmc *mmc)
  107. {
  108. return CONFIG_SYS_MMC_ENV_PART;
  109. }
  110. static unsigned char env_mmc_orig_hwpart;
  111. static int mmc_set_env_part(struct mmc *mmc)
  112. {
  113. uint part = mmc_get_env_part(mmc);
  114. int dev = mmc_get_env_dev();
  115. int ret = 0;
  116. env_mmc_orig_hwpart = mmc_get_blk_desc(mmc)->hwpart;
  117. ret = blk_select_hwpart_devnum(IF_TYPE_MMC, dev, part);
  118. if (ret)
  119. puts("MMC partition switch failed\n");
  120. return ret;
  121. }
  122. #else
  123. static inline int mmc_set_env_part(struct mmc *mmc) {return 0; };
  124. #endif
  125. static const char *init_mmc_for_env(struct mmc *mmc)
  126. {
  127. if (!mmc)
  128. return "!No MMC card found";
  129. #if CONFIG_IS_ENABLED(BLK)
  130. struct udevice *dev;
  131. if (blk_get_from_parent(mmc->dev, &dev))
  132. return "!No block device";
  133. #else
  134. if (mmc_init(mmc))
  135. return "!MMC init failed";
  136. #endif
  137. if (mmc_set_env_part(mmc))
  138. return "!MMC partition switch failed";
  139. return NULL;
  140. }
  141. static void fini_mmc_for_env(struct mmc *mmc)
  142. {
  143. #ifdef CONFIG_SYS_MMC_ENV_PART
  144. int dev = mmc_get_env_dev();
  145. blk_select_hwpart_devnum(IF_TYPE_MMC, dev, env_mmc_orig_hwpart);
  146. #endif
  147. }
  148. #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_SPL_BUILD)
  149. static inline int write_env(struct mmc *mmc, unsigned long size,
  150. unsigned long offset, const void *buffer)
  151. {
  152. uint blk_start, blk_cnt, n;
  153. struct blk_desc *desc = mmc_get_blk_desc(mmc);
  154. blk_start = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
  155. blk_cnt = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
  156. n = blk_dwrite(desc, blk_start, blk_cnt, (u_char *)buffer);
  157. return (n == blk_cnt) ? 0 : -1;
  158. }
  159. static int env_mmc_save(void)
  160. {
  161. ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
  162. int dev = mmc_get_env_dev();
  163. struct mmc *mmc = find_mmc_device(dev);
  164. u32 offset;
  165. int ret, copy = 0;
  166. const char *errmsg;
  167. errmsg = init_mmc_for_env(mmc);
  168. if (errmsg) {
  169. printf("%s\n", errmsg);
  170. return 1;
  171. }
  172. ret = env_export(env_new);
  173. if (ret)
  174. goto fini;
  175. #ifdef CONFIG_ENV_OFFSET_REDUND
  176. if (gd->env_valid == ENV_VALID)
  177. copy = 1;
  178. #endif
  179. if (mmc_get_env_addr(mmc, copy, &offset)) {
  180. ret = 1;
  181. goto fini;
  182. }
  183. printf("Writing to %sMMC(%d)... ", copy ? "redundant " : "", dev);
  184. if (write_env(mmc, CONFIG_ENV_SIZE, offset, (u_char *)env_new)) {
  185. puts("failed\n");
  186. ret = 1;
  187. goto fini;
  188. }
  189. ret = 0;
  190. #ifdef CONFIG_ENV_OFFSET_REDUND
  191. gd->env_valid = gd->env_valid == ENV_REDUND ? ENV_VALID : ENV_REDUND;
  192. #endif
  193. fini:
  194. fini_mmc_for_env(mmc);
  195. return ret;
  196. }
  197. #endif /* CONFIG_CMD_SAVEENV && !CONFIG_SPL_BUILD */
  198. static inline int read_env(struct mmc *mmc, unsigned long size,
  199. unsigned long offset, const void *buffer)
  200. {
  201. uint blk_start, blk_cnt, n;
  202. struct blk_desc *desc = mmc_get_blk_desc(mmc);
  203. blk_start = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
  204. blk_cnt = ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len;
  205. n = blk_dread(desc, blk_start, blk_cnt, (uchar *)buffer);
  206. return (n == blk_cnt) ? 0 : -1;
  207. }
  208. #ifdef CONFIG_ENV_OFFSET_REDUND
  209. static int env_mmc_load(void)
  210. {
  211. #if !defined(ENV_IS_EMBEDDED)
  212. struct mmc *mmc;
  213. u32 offset1, offset2;
  214. int read1_fail = 0, read2_fail = 0;
  215. int ret;
  216. int dev = mmc_get_env_dev();
  217. const char *errmsg = NULL;
  218. ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env1, 1);
  219. ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env2, 1);
  220. mmc_initialize(NULL);
  221. mmc = find_mmc_device(dev);
  222. errmsg = init_mmc_for_env(mmc);
  223. if (errmsg) {
  224. ret = -EIO;
  225. goto err;
  226. }
  227. if (mmc_get_env_addr(mmc, 0, &offset1) ||
  228. mmc_get_env_addr(mmc, 1, &offset2)) {
  229. ret = -EIO;
  230. goto fini;
  231. }
  232. read1_fail = read_env(mmc, CONFIG_ENV_SIZE, offset1, tmp_env1);
  233. read2_fail = read_env(mmc, CONFIG_ENV_SIZE, offset2, tmp_env2);
  234. ret = env_import_redund((char *)tmp_env1, read1_fail, (char *)tmp_env2,
  235. read2_fail);
  236. fini:
  237. fini_mmc_for_env(mmc);
  238. err:
  239. if (ret)
  240. set_default_env(errmsg);
  241. #endif
  242. return ret;
  243. }
  244. #else /* ! CONFIG_ENV_OFFSET_REDUND */
  245. static int env_mmc_load(void)
  246. {
  247. #if !defined(ENV_IS_EMBEDDED)
  248. ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
  249. struct mmc *mmc;
  250. u32 offset;
  251. int ret;
  252. int dev = mmc_get_env_dev();
  253. const char *errmsg;
  254. mmc = find_mmc_device(dev);
  255. errmsg = init_mmc_for_env(mmc);
  256. if (errmsg) {
  257. ret = -EIO;
  258. goto err;
  259. }
  260. if (mmc_get_env_addr(mmc, 0, &offset)) {
  261. ret = -EIO;
  262. goto fini;
  263. }
  264. if (read_env(mmc, CONFIG_ENV_SIZE, offset, buf)) {
  265. errmsg = "!read failed";
  266. ret = -EIO;
  267. goto fini;
  268. }
  269. ret = env_import(buf, 1);
  270. fini:
  271. fini_mmc_for_env(mmc);
  272. err:
  273. if (ret)
  274. set_default_env(errmsg);
  275. #endif
  276. return ret;
  277. }
  278. #endif /* CONFIG_ENV_OFFSET_REDUND */
  279. U_BOOT_ENV_LOCATION(mmc) = {
  280. .location = ENVL_MMC,
  281. ENV_NAME("MMC")
  282. .load = env_mmc_load,
  283. #ifndef CONFIG_SPL_BUILD
  284. .save = env_save_ptr(env_mmc_save),
  285. #endif
  286. };