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/*
* (C) Copyright 2008-2010 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>
/* references to names in env_common.c */
extern uchar default_environment[];
char *env_name_spec = "MMC";
#ifdef ENV_IS_EMBEDDED
extern uchar environment[];
env_t *env_ptr = (env_t *)(&environment[0]);
#else /* ! ENV_IS_EMBEDDED */
env_t *env_ptr;
#endif /* ENV_IS_EMBEDDED */
static int mmc_env_devno;
/* local functions */
#if !defined(ENV_IS_EMBEDDED)
static void use_default(void);
#endif
DECLARE_GLOBAL_DATA_PTR;
uchar env_get_char_spec(int index)
{
return *((uchar *)(gd->env_addr + index));
}
int env_init(void)
{
/* use default */
gd->env_addr = (ulong)&default_environment[0];
gd->env_valid = 1;
#ifdef CONFIG_DYNAMIC_MMC_DEVNO
mmc_env_devno = get_mmc_env_devno();
#else
mmc_env_devno = CONFIG_SYS_MMC_ENV_DEV;
#endif
return 0;
}
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;
}
return 0;
}
#ifdef CONFIG_CMD_SAVEENV
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(mmc_env_devno, blk_start,
blk_cnt, (u_char *)buffer);
return (n == blk_cnt) ? 0 : -1;
}
int saveenv(void)
{
struct mmc *mmc = find_mmc_device(mmc_env_devno);
if (init_mmc_for_env(mmc))
return 1;
printf("Writing to MMC(%d)... ", mmc_env_devno);
if (write_env(mmc, CONFIG_ENV_SIZE, CONFIG_ENV_OFFSET, env_ptr)) {
puts("failed\n");
return 1;
}
puts("done\n");
return 0;
}
#endif /* CONFIG_CMD_SAVEENV */
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(mmc_env_devno, blk_start,
blk_cnt, (uchar *)buffer);
return (n == blk_cnt) ? 0 : -1;
}
void env_relocate_spec(void)
{
#if !defined(ENV_IS_EMBEDDED)
struct mmc *mmc = find_mmc_device(mmc_env_devno);
if (init_mmc_for_env(mmc))
return;
if (read_env(mmc, CONFIG_ENV_SIZE, CONFIG_ENV_OFFSET, env_ptr))
return use_default();
if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
return use_default();
gd->env_valid = 1;
#endif
}
#if !defined(ENV_IS_EMBEDDED)
static void use_default()
{
puts ("*** Warning - bad CRC or MMC, using default environment\n\n");
set_default_env();
}
#endif
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