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/*
* (C) Copyright 2008-2010 Freescale Semiconductor, Inc.
* (C) Copyright 2000-2006
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Andreas Heppel <aheppel@sysgo.de>
* 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>
#if defined(CONFIG_CMD_ENV) && defined(CONFIG_CMD_MMC)
#define CMD_SAVEENV
#elif defined(CONFIG_ENV_OFFSET_REDUND)
#error Cannot use CONFIG_ENV_OFFSET_REDUND without CONFIG_CMD_ENV & CONFIG_CMD_MMC
#endif
#if defined(CONFIG_ENV_SIZE_REDUND) && (CONFIG_ENV_SIZE_REDUND < CONFIG_ENV_SIZE)
#error CONFIG_ENV_SIZE_REDUND should not be less then CONFIG_ENV_SIZE
#endif
/* 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 */
/* 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;
return 0;
}
inline 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 CMD_SAVEENV
inline int write_env(struct mmc *mmc, unsigned long size,
unsigned long offset, const void *buffer)
{
uint blk_start = 0, blk_cnt = 0, n = 0;
blk_start = (offset & (0x200 - 1)) \
? ((offset >> 9) + 1) : (offset >> 9);
blk_cnt = (size & (0x200 - 1)) \
? ((size >> 9) + 1) : (size >> 9);
n = mmc->block_dev.block_write(0, blk_start , blk_cnt, (u_char *)buffer);
return (n == blk_cnt) ? 0 : -1;
}
int saveenv(void)
{
struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
if (init_mmc_for_env(mmc))
return 1;
printf("Writing to MMC(%d)... ", CONFIG_SYS_MMC_ENV_DEV);
if (write_env(mmc, CONFIG_ENV_SIZE, \
CONFIG_ENV_OFFSET, env_ptr)) {
puts("failed\n");
return 1;
}
puts("done\n");
return 0;
}
#endif /* CMD_SAVEENV */
inline int read_env(struct mmc *mmc, unsigned long size,
unsigned long offset, const void *buffer)
{
uint blk_start = 0, blk_cnt = 0, n = 0;
blk_start = (offset & (0x200 - 1)) ? \
((offset >> 9) + 1) : (offset >> 9);
blk_cnt = (size & (0x200 - 1)) ? \
((size >> 9) + 1) : (size >> 9);
n = mmc->block_dev.block_read(0, 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(CONFIG_SYS_MMC_ENV_DEV);
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();
#endif /* ! ENV_IS_EMBEDDED */
}
#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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