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env: Save environment at the end of an MMC partition

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Allow the platform to define a partition by name at the end of which
the environment data will be located.

Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
This commit is contained in:
Jorge Ramirez-Ortiz 2017-11-06 14:16:37 +01:00 committed by Tom Rini
parent b12907f279
commit c9e87ba665
2 changed files with 67 additions and 4 deletions
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9
doc/device-tree-bindings/config.txt
View file

@ -21,6 +21,15 @@ u-boot,efi-partition-entries-offset
This setting will override any values configured via Kconfig.
u-boot,mmc-env-partition
if present, the environment shall be placed at the last
CONFIG_ENV_SIZE blocks of the partition on the
CONFIG_SYS_MMC_ENV_DEV.
if u-boot,mmc-env-offset* is present, this setting will take
precedence. In that case, only if the partition is not found,
mmc-env-offset* will be tried.
u-boot,mmc-env-offset
u-boot,mmc-env-offset-redundant
If present, the values of the 'u-boot,mmc-env-offset' and/or

62
env/mmc.c vendored
View file

@ -15,9 +15,13 @@
#include <malloc.h>
#include <memalign.h>
#include <mmc.h>
#include <part.h>
#include <search.h>
#include <errno.h>
#define __STR(X) #X
#define STR(X) __STR(X)
#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
@ -30,18 +34,68 @@ DECLARE_GLOBAL_DATA_PTR;
#endif
#if CONFIG_IS_ENABLED(OF_CONTROL)
static inline int mmc_offset_try_partition(const char *str, s64 *val)
{
disk_partition_t info;
struct blk_desc *desc;
int len, i, ret;
ret = blk_get_device_by_str("mmc", STR(CONFIG_SYS_MMC_ENV_DEV), &desc);
if (ret < 0)
return (ret);
for (i = 1;;i++) {
ret = part_get_info(desc, i, &info);
if (ret < 0)
return ret;
if (!strncmp((const char *)info.name, str, sizeof(str)))
break;
}
/* round up to info.blksz */
len = (CONFIG_ENV_SIZE + info.blksz - 1) & ~(info.blksz - 1);
/* use the top of the partion for the environment */
*val = (info.start + info.size - 1) - len / info.blksz;
return 0;
}
static inline s64 mmc_offset(int copy)
{
const char *propname = "u-boot,mmc-env-offset";
s64 defvalue = CONFIG_ENV_OFFSET;
const struct {
const char *offset_redund;
const char *partition;
const char *offset;
} dt_prop = {
.offset_redund = "u-boot,mmc-env-offset-redundant",
.partition = "u-boot,mmc-env-partition",
.offset = "u-boot,mmc-env-offset",
};
s64 val, defvalue;
const char *propname;
const char *str;
int err;
/* look for the partition in mmc CONFIG_SYS_MMC_ENV_DEV */
str = fdtdec_get_config_string(gd->fdt_blob, dt_prop.partition);
if (str) {
/* try to place the environment at end of the partition */
err = mmc_offset_try_partition(str, &val);
if (!err)
return val;
}
defvalue = CONFIG_ENV_OFFSET;
propname = dt_prop.offset;
#if defined(CONFIG_ENV_OFFSET_REDUND)
if (copy) {
propname = "u-boot,mmc-env-offset-redundant";
defvalue = CONFIG_ENV_OFFSET_REDUND;
propname = dt_prop.offset_redund;
}
#endif
return fdtdec_get_config_int(gd->fdt_blob, propname, defvalue);
}
#else