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env: mmc: add erase-function 

this adds erase environment for mmc storage

squashed fixes:
 - add CONFIG_CMD_ERASEENV
 - env: erase redundant offset if defined
 - changes mentioned by Simon
 - fix whitespaces around errmsg

Suggested-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
This commit is contained in:
Frank Wunderlich 2019-06-29 11:36:20 +02:00 committed by Tom Rini
parent cd121bdb6d
commit 3485392506
1 changed files with 51 additions and 0 deletions
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51
env/mmc.c vendored
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@ -242,6 +242,54 @@ fini:
fini_mmc_for_env(mmc);
return ret;
}
#if defined(CONFIG_CMD_ERASEENV)
static inline int erase_env(struct mmc *mmc, unsigned long size,
unsigned long offset)
{
uint blk_start, blk_cnt, n;
struct blk_desc *desc = mmc_get_blk_desc(mmc);
blk_start = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
blk_cnt = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
n = blk_derase(desc, blk_start, blk_cnt);
printf("%d blocks erased: %s\n", n, (n == blk_cnt) ? "OK" : "ERROR");
return (n == blk_cnt) ? 0 : 1;
}
static int env_mmc_erase(void)
{
int dev = mmc_get_env_dev();
struct mmc *mmc = find_mmc_device(dev);
int ret, copy = 0;
u32 offset;
const char *errmsg;
errmsg = init_mmc_for_env(mmc);
if (errmsg) {
printf("%s\n", errmsg);
return 1;
}
if (mmc_get_env_addr(mmc, copy, &offset))
return CMD_RET_FAILURE;
ret = erase_env(mmc, CONFIG_ENV_SIZE, offset);
#ifdef CONFIG_ENV_OFFSET_REDUND
copy = 1;
if (mmc_get_env_addr(mmc, copy, &offset))
return CMD_RET_FAILURE;
ret |= erase_env(mmc, CONFIG_ENV_SIZE, offset);
#endif
return ret;
}
#endif /* CONFIG_CMD_ERASEENV */
#endif /* CONFIG_CMD_SAVEENV && !CONFIG_SPL_BUILD */
static inline int read_env(struct mmc *mmc, unsigned long size,
@ -351,5 +399,8 @@ U_BOOT_ENV_LOCATION(mmc) = {
.load = env_mmc_load,
#ifndef CONFIG_SPL_BUILD
.save = env_save_ptr(env_mmc_save),
#if defined(CONFIG_CMD_ERASEENV)
.erase = env_mmc_erase,
#endif
#endif
};