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/*
* LowLevel function for DataFlash environment support
* Author : Gilles Gastaldi (Atmel)
*
* 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 <command.h>
#include <environment.h>
#include <linux/stddef.h>
#include <dataflash.h>
#include <search.h>
#include <errno.h>
DECLARE_GLOBAL_DATA_PTR;
env_t *env_ptr;
char *env_name_spec = "dataflash";
static char env_buf[CONFIG_ENV_SIZE];
uchar env_get_char_spec(int index)
{
uchar c;
read_dataflash(CONFIG_ENV_ADDR + index + offsetof(env_t, data),
1, (char *)&c);
return c;
}
void env_relocate_spec(void)
{
read_dataflash(CONFIG_ENV_ADDR, CONFIG_ENV_SIZE, env_buf);
env_import(env_buf, 1);
}
#ifdef CONFIG_ENV_OFFSET_REDUND
#error No support for redundant environment on dataflash yet!
#endif
int saveenv(void)
{
env_t *env_new = (env_t *)env_buf;
ssize_t len;
char *res;
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);
return 1;
}
env_new->crc = crc32(0, env_new->data, ENV_SIZE);
return write_dataflash(CONFIG_ENV_ADDR,
(unsigned long)env_new,
CONFIG_ENV_SIZE);
}
/*
* Initialize environment use
*
* We are still running from ROM, so data use is limited.
* Use a (moderately small) buffer on the stack
*/
int env_init(void)
{
ulong crc, len = ENV_SIZE, new = 0;
unsigned off;
uchar buf[64];
if (gd->env_valid)
return 0;
AT91F_DataflashInit(); /* prepare for DATAFLASH read/write */
/* read old CRC */
read_dataflash(CONFIG_ENV_ADDR + offsetof(env_t, crc),
sizeof(ulong), (char *)&crc);
off = offsetof(env_t, data);
while (len > 0) {
int n = (len > sizeof(buf)) ? sizeof(buf) : len;
read_dataflash(CONFIG_ENV_ADDR + off, n, (char *)buf);
new = crc32(new, buf, n);
len -= n;
off += n;
}
if (crc == new) {
gd->env_addr = offsetof(env_t, data);
gd->env_valid = 1;
} else {
gd->env_addr = (ulong)&default_environment[0];
gd->env_valid = 0;
}
return 0;
}
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