env_mmc.c
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/*
* (C) Copyright 2008-2011 Freescale Semiconductor, Inc.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
/* #define DEBUG */
#include <common.h>
#include <command.h>
#include <environment.h>
#include <linux/stddef.h>
#include <malloc.h>
#include <mmc.h>
#include <search.h>
#include <errno.h>
char *env_name_spec = "MMC";
#ifdef ENV_IS_EMBEDDED
env_t *env_ptr = &environment;
#else /* ! ENV_IS_EMBEDDED */
env_t *env_ptr;
#endif /* ENV_IS_EMBEDDED */
DECLARE_GLOBAL_DATA_PTR;
#if !defined(CONFIG_ENV_OFFSET)
#define CONFIG_ENV_OFFSET 0
#endif
static int __mmc_get_env_addr(struct mmc *mmc, u32 *env_addr)
{
*env_addr = CONFIG_ENV_OFFSET;
return 0;
}
int mmc_get_env_addr(struct mmc *mmc, u32 *env_addr)
__attribute__((weak, alias("__mmc_get_env_addr")));
int env_init(void)
{
/* use default */
gd->env_addr = (ulong)&default_environment[0];
gd->env_valid = 1;
return 0;
}
static int init_mmc_for_env(struct mmc *mmc)
{
if (!mmc) {
puts("No MMC card found\n");
return -1;
}
if (mmc_init(mmc)) {
puts("MMC init failed\n");
return -1;
}
#ifdef CONFIG_SYS_MMC_ENV_PART
if (CONFIG_SYS_MMC_ENV_PART != mmc->part_num) {
if (mmc_switch_part(CONFIG_SYS_MMC_ENV_DEV,
CONFIG_SYS_MMC_ENV_PART)) {
puts("MMC partition switch failed\n");
return -1;
}
}
#endif
return 0;
}
static void fini_mmc_for_env(struct mmc *mmc)
{
#ifdef CONFIG_SYS_MMC_ENV_PART
if (CONFIG_SYS_MMC_ENV_PART != mmc->part_num)
mmc_switch_part(CONFIG_SYS_MMC_ENV_DEV,
mmc->part_num);
#endif
}
#ifdef CONFIG_CMD_SAVEENV
static inline int write_env(struct mmc *mmc, unsigned long size,
unsigned long offset, const void *buffer)
{
uint blk_start, blk_cnt, n;
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 = mmc->block_dev.block_write(CONFIG_SYS_MMC_ENV_DEV, blk_start,
blk_cnt, (u_char *)buffer);
return (n == blk_cnt) ? 0 : -1;
}
int saveenv(void)
{
ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
ssize_t len;
char *res;
struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
u32 offset;
int ret;
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) {
error("Cannot export environment: errno = %d\n", errno);
ret = 1;
goto fini;
}
env_new->crc = crc32(0, &env_new->data[0], ENV_SIZE);
printf("Writing to MMC(%d)... ", CONFIG_SYS_MMC_ENV_DEV);
if (write_env(mmc, CONFIG_ENV_SIZE, offset, (u_char *)env_new)) {
puts("failed\n");
ret = 1;
goto fini;
}
puts("done\n");
ret = 0;
fini:
fini_mmc_for_env(mmc);
return ret;
}
#endif /* CONFIG_CMD_SAVEENV */
static inline int read_env(struct mmc *mmc, unsigned long size,
unsigned long offset, const void *buffer)
{
uint blk_start, blk_cnt, n;
blk_start = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
blk_cnt = ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len;
n = mmc->block_dev.block_read(CONFIG_SYS_MMC_ENV_DEV, blk_start,
blk_cnt, (uchar *)buffer);
return (n == blk_cnt) ? 0 : -1;
}
void env_relocate_spec(void)
{
#if !defined(ENV_IS_EMBEDDED)
ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
u32 offset;
int ret;
if (init_mmc_for_env(mmc)) {
ret = 1;
goto err;
}
if (mmc_get_env_addr(mmc, &offset)) {
ret = 1;
goto fini;
}
if (read_env(mmc, CONFIG_ENV_SIZE, offset, buf)) {
ret = 1;
goto fini;
}
env_import(buf, 1);
ret = 0;
fini:
fini_mmc_for_env(mmc);
err:
if (ret)
set_default_env(NULL);
#endif
}