104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
/* 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>
|
|
|
|
#if defined(CFG_ENV_IS_IN_DATAFLASH) /* Environment is in DataFlash */
|
|
|
|
#include <command.h>
|
|
#include <environment.h>
|
|
#include <linux/stddef.h>
|
|
#include <dataflash.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
env_t *env_ptr = NULL;
|
|
|
|
char * env_name_spec = "dataflash";
|
|
|
|
extern int read_dataflash (unsigned long addr, unsigned long size, char
|
|
*result);
|
|
extern int write_dataflash (unsigned long addr_dest, unsigned long addr_src,
|
|
unsigned long size);
|
|
extern int AT91F_DataflashInit (void);
|
|
extern uchar default_environment[];
|
|
/* extern int default_environment_size; */
|
|
|
|
|
|
uchar env_get_char_spec (int index)
|
|
{
|
|
uchar c;
|
|
read_dataflash (CFG_ENV_ADDR+index+offsetof(env_t,data),1,&c);
|
|
return (c);
|
|
}
|
|
|
|
void env_relocate_spec (void)
|
|
{
|
|
read_dataflash (CFG_ENV_ADDR,CFG_ENV_SIZE,(uchar *)env_ptr);
|
|
}
|
|
|
|
int saveenv(void)
|
|
{
|
|
/* env must be copied to do not alter env structure in memory*/
|
|
unsigned char temp[CFG_ENV_SIZE];
|
|
int i;
|
|
memcpy(temp, env_ptr, CFG_ENV_SIZE);
|
|
return write_dataflash (CFG_ENV_ADDR, (unsigned long)temp, CFG_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, new;
|
|
unsigned off;
|
|
uchar buf[64];
|
|
if (gd->env_valid == 0){
|
|
AT91F_DataflashInit(); /* prepare for DATAFLASH read/write */
|
|
|
|
/* read old CRC */
|
|
read_dataflash (CFG_ENV_ADDR+offsetof(env_t,crc),sizeof(ulong),&crc);
|
|
new = 0;
|
|
len = ENV_SIZE;
|
|
off = offsetof(env_t,data);
|
|
while (len > 0) {
|
|
int n = (len > sizeof(buf)) ? sizeof(buf) : len;
|
|
read_dataflash (CFG_ENV_ADDR+off,n , 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);
|
|
}
|
|
|
|
#endif /* CFG_ENV_IS_IN_DATAFLASH */
|