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/*
* (C) Copyright 2000-2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Andreas Heppel <aheppel@sysgo.de>
*
* (C) Copyright 2008 Atmel Corporation
*
* 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
*/
#include <common.h>
#include <environment.h>
#include <malloc.h>
#include <spi_flash.h>
#ifndef CONFIG_ENV_SPI_BUS
# define CONFIG_ENV_SPI_BUS 0
#endif
#ifndef CONFIG_ENV_SPI_CS
# define CONFIG_ENV_SPI_CS 0
#endif
#ifndef CONFIG_ENV_SPI_MAX_HZ
# define CONFIG_ENV_SPI_MAX_HZ 1000000
#endif
#ifndef CONFIG_ENV_SPI_MODE
# define CONFIG_ENV_SPI_MODE SPI_MODE_3
#endif
DECLARE_GLOBAL_DATA_PTR;
/* references to names in env_common.c */
extern uchar default_environment[];
extern int default_environment_size;
char * env_name_spec = "SPI Flash";
env_t *env_ptr;
static struct spi_flash *env_flash;
uchar env_get_char_spec(int index)
{
return *((uchar *)(gd->env_addr + index));
}
int saveenv(void)
{
u32 saved_size, saved_offset;
char *saved_buffer = NULL;
u32 sector = 1;
int ret;
if (!env_flash) {
puts("Environment SPI flash not initialized\n");
return 1;
}
/* Is the sector larger than the env (i.e. embedded) */
if (CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE) {
saved_size = CONFIG_ENV_SECT_SIZE - CONFIG_ENV_SIZE;
saved_offset = CONFIG_ENV_OFFSET + CONFIG_ENV_SIZE;
saved_buffer = malloc(saved_size);
if (!saved_buffer) {
ret = 1;
goto done;
}
ret = spi_flash_read(env_flash, saved_offset, saved_size, saved_buffer);
if (ret)
goto done;
}
if (CONFIG_ENV_SIZE > CONFIG_ENV_SECT_SIZE) {
sector = CONFIG_ENV_SIZE / CONFIG_ENV_SECT_SIZE;
if (CONFIG_ENV_SIZE % CONFIG_ENV_SECT_SIZE)
sector++;
}
puts("Erasing SPI flash...");
ret = spi_flash_erase(env_flash, CONFIG_ENV_OFFSET, sector * CONFIG_ENV_SECT_SIZE);
if (ret)
goto done;
puts("Writing to SPI flash...");
ret = spi_flash_write(env_flash, CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE, env_ptr);
if (ret)
goto done;
if (CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE) {
ret = spi_flash_write(env_flash, saved_offset, saved_size, saved_buffer);
if (ret)
goto done;
}
ret = 0;
puts("done\n");
done:
if (saved_buffer)
free(saved_buffer);
return ret;
}
void env_relocate_spec(void)
{
int ret;
env_flash = spi_flash_probe(CONFIG_ENV_SPI_BUS, CONFIG_ENV_SPI_CS,
CONFIG_ENV_SPI_MAX_HZ, CONFIG_ENV_SPI_MODE);
if (!env_flash)
goto err_probe;
ret = spi_flash_read(env_flash, CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE, env_ptr);
if (ret)
goto err_read;
if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
goto err_crc;
gd->env_valid = 1;
return;
err_read:
spi_flash_free(env_flash);
env_flash = NULL;
err_probe:
err_crc:
puts("*** Warning - bad CRC, using default environment\n\n");
if (default_environment_size > CONFIG_ENV_SIZE) {
gd->env_valid = 0;
puts("*** Error - default environment is too large\n\n");
return;
}
memset(env_ptr, 0, sizeof(env_t));
memcpy(env_ptr->data, default_environment, default_environment_size);
env_ptr->crc = crc32(0, env_ptr->data, ENV_SIZE);
gd->env_valid = 1;
}
int env_init(void)
{
/* SPI flash isn't usable before relocation */
gd->env_addr = (ulong)&default_environment[0];
gd->env_valid = 1;
return 0;
}
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