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authorMichael Heimpold <mhei@heimpold.de>2013-04-10 10:36:19 +0000
committerTom Rini <trini@ti.com>2013-05-01 16:41:10 -0400
commitd196bd880347373237d73e0d115b4d51c68cf2ad (patch)
tree3a4b4cc54e282831b6e800688ca35e60d9077322 /common
parentd2eae43ba803cff75b44a07d08d718ecdecdee94 (diff)
env_mmc: add support for redundant environment
This patch add support for storing the environment redundant on mmc devices. Substantially it re-uses the logic from the NAND implementation, that means using an incremental counter for marking newer data. Signed-off-by: Michael Heimpold <mhei@heimpold.de>
Diffstat (limited to 'common')
-rw-r--r--common/env_mmc.c132
1 files changed, 123 insertions, 9 deletions
diff --git a/common/env_mmc.c b/common/env_mmc.c
index 02bd5aed10..9ca098fa67 100644
--- a/common/env_mmc.c
+++ b/common/env_mmc.c
@@ -32,6 +32,11 @@
#include <search.h>
#include <errno.h>
+#if defined(CONFIG_ENV_SIZE_REDUND) && \
+ (CONFIG_ENV_SIZE_REDUND != CONFIG_ENV_SIZE)
+#error CONFIG_ENV_SIZE_REDUND should be the same as CONFIG_ENV_SIZE
+#endif
+
char *env_name_spec = "MMC";
#ifdef ENV_IS_EMBEDDED
@@ -46,9 +51,13 @@ DECLARE_GLOBAL_DATA_PTR;
#define CONFIG_ENV_OFFSET 0
#endif
-__weak int mmc_get_env_addr(struct mmc *mmc, u32 *env_addr)
+__weak int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr)
{
*env_addr = CONFIG_ENV_OFFSET;
+#ifdef CONFIG_ENV_OFFSET_REDUND
+ if (copy)
+ *env_addr = CONFIG_ENV_OFFSET_REDUND;
+#endif
return 0;
}
@@ -110,6 +119,10 @@ static inline int write_env(struct mmc *mmc, unsigned long size,
return (n == blk_cnt) ? 0 : -1;
}
+#ifdef CONFIG_ENV_OFFSET_REDUND
+static unsigned char env_flags;
+#endif
+
int saveenv(void)
{
ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
@@ -117,16 +130,11 @@ int saveenv(void)
char *res;
struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
u32 offset;
- int ret;
+ int ret, copy = 0;
if (init_mmc_for_env(mmc))
return 1;
- if (mmc_get_env_addr(mmc, &offset)) {
- ret = 1;
- goto fini;
- }
-
res = (char *)&env_new->data;
len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
if (len < 0) {
@@ -136,7 +144,21 @@ int saveenv(void)
}
env_new->crc = crc32(0, &env_new->data[0], ENV_SIZE);
- printf("Writing to MMC(%d)... ", CONFIG_SYS_MMC_ENV_DEV);
+
+#ifdef CONFIG_ENV_OFFSET_REDUND
+ env_new->flags = ++env_flags; /* increase the serial */
+
+ if (gd->env_valid == 1)
+ copy = 1;
+#endif
+
+ if (mmc_get_env_addr(mmc, copy, &offset)) {
+ ret = 1;
+ goto fini;
+ }
+
+ printf("Writing to %sMMC(%d)... ", copy ? "redundant " : "",
+ CONFIG_SYS_MMC_ENV_DEV);
if (write_env(mmc, CONFIG_ENV_SIZE, offset, (u_char *)env_new)) {
puts("failed\n");
ret = 1;
@@ -146,6 +168,10 @@ int saveenv(void)
puts("done\n");
ret = 0;
+#ifdef CONFIG_ENV_OFFSET_REDUND
+ gd->env_valid = gd->env_valid == 2 ? 1 : 2;
+#endif
+
fini:
fini_mmc_for_env(mmc);
return ret;
@@ -166,6 +192,93 @@ static inline int read_env(struct mmc *mmc, unsigned long size,
return (n == blk_cnt) ? 0 : -1;
}
+#ifdef CONFIG_ENV_OFFSET_REDUND
+void env_relocate_spec(void)
+{
+#if !defined(ENV_IS_EMBEDDED)
+ struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
+ u32 offset1, offset2;
+ int read1_fail = 0, read2_fail = 0;
+ int crc1_ok = 0, crc2_ok = 0;
+ env_t *ep, *tmp_env1, *tmp_env2;
+ int ret;
+
+ tmp_env1 = (env_t *)malloc(CONFIG_ENV_SIZE);
+ tmp_env2 = (env_t *)malloc(CONFIG_ENV_SIZE);
+ if (tmp_env1 == NULL || tmp_env2 == NULL) {
+ puts("Can't allocate buffers for environment\n");
+ ret = 1;
+ goto err;
+ }
+
+ if (init_mmc_for_env(mmc)) {
+ ret = 1;
+ goto err;
+ }
+
+ if (mmc_get_env_addr(mmc, 0, &offset1) ||
+ mmc_get_env_addr(mmc, 1, &offset2)) {
+ ret = 1;
+ goto fini;
+ }
+
+ read1_fail = read_env(mmc, CONFIG_ENV_SIZE, offset1, tmp_env1);
+ read2_fail = read_env(mmc, CONFIG_ENV_SIZE, offset2, tmp_env2);
+
+ if (read1_fail && read2_fail)
+ puts("*** Error - No Valid Environment Area found\n");
+ else if (read1_fail || read2_fail)
+ puts("*** Warning - some problems detected "
+ "reading environment; recovered successfully\n");
+
+ crc1_ok = !read1_fail &&
+ (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
+ crc2_ok = !read2_fail &&
+ (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
+
+ if (!crc1_ok && !crc2_ok) {
+ ret = 1;
+ goto fini;
+ } else if (crc1_ok && !crc2_ok) {
+ gd->env_valid = 1;
+ } else if (!crc1_ok && crc2_ok) {
+ gd->env_valid = 2;
+ } else {
+ /* both ok - check serial */
+ if (tmp_env1->flags == 255 && tmp_env2->flags == 0)
+ gd->env_valid = 2;
+ else if (tmp_env2->flags == 255 && tmp_env1->flags == 0)
+ gd->env_valid = 1;
+ else if (tmp_env1->flags > tmp_env2->flags)
+ gd->env_valid = 1;
+ else if (tmp_env2->flags > tmp_env1->flags)
+ gd->env_valid = 2;
+ else /* flags are equal - almost impossible */
+ gd->env_valid = 1;
+ }
+
+ free(env_ptr);
+
+ if (gd->env_valid == 1)
+ ep = tmp_env1;
+ else
+ ep = tmp_env2;
+
+ env_flags = ep->flags;
+ env_import((char *)ep, 0);
+ ret = 0;
+
+fini:
+ fini_mmc_for_env(mmc);
+err:
+ if (ret)
+ set_default_env(NULL);
+
+ free(tmp_env1);
+ free(tmp_env2);
+#endif
+}
+#else /* ! CONFIG_ENV_OFFSET_REDUND */
void env_relocate_spec(void)
{
#if !defined(ENV_IS_EMBEDDED)
@@ -179,7 +292,7 @@ void env_relocate_spec(void)
goto err;
}
- if (mmc_get_env_addr(mmc, &offset)) {
+ if (mmc_get_env_addr(mmc, 0, &offset)) {
ret = 1;
goto fini;
}
@@ -199,3 +312,4 @@ err:
set_default_env(NULL);
#endif
}
+#endif /* CONFIG_ENV_OFFSET_REDUND */