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/*
* (C) Copyright 2004
* Jian Zhang, Texas Instruments, jzhang@ti.com.
* (C) Copyright 2000-2004
* 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>
#if defined(CFG_ENV_IS_IN_NAND) /* Environment is in Nand Flash */
#include <command.h>
#include <environment.h>
#include <linux/stddef.h>
#include <linux/mtd/nand.h>
#if ((CONFIG_COMMANDS&(CFG_CMD_ENV|CFG_CMD_NAND)) == (CFG_CMD_ENV|CFG_CMD_NAND))
#define CMD_SAVEENV
#endif
#if defined(CFG_ENV_SIZE_REDUND)
#error CFG_ENV_SIZE_REDUND not supported yet
#endif
#if defined(CFG_ENV_ADDR_REDUND)
#error CFG_ENV_ADDR_REDUND and CFG_ENV_IS_IN_NAND not supported yet
#endif
#ifdef CONFIG_INFERNO
#error CONFIG_INFERNO not supported yet
#endif
/* references to names in cmd_nand.c */
#define NANDRW_READ 0x01
#define NANDRW_WRITE 0x00
#define NANDRW_JFFS2 0x02
extern struct nand_chip nand_dev_desc[];
int nand_rw (struct nand_chip* nand, int cmd,
size_t start, size_t len,
size_t * retlen, u_char * buf);
int nand_erase(struct nand_chip* nand, size_t ofs,
size_t len, int clean);
/* references to names in env_common.c */
extern uchar default_environment[];
extern int default_environment_size;
char * env_name_spec = "NAND";
#ifdef ENV_IS_EMBEDDED
extern uchar environment[];
env_t *env_ptr = (env_t *)(&environment[0]);
#else /* ! ENV_IS_EMBEDDED */
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#endif /* ENV_IS_EMBEDDED */
/* local functions */
static void use_default(void);
uchar env_get_char_spec (int index)
{
DECLARE_GLOBAL_DATA_PTR;
return ( *((uchar *)(gd->env_addr + index)) );
}
/* this is called before nand_init()
* so we can't read Nand to validate env data.
* Mark it OK for now. env_relocate() in env_common.c
* will call our relocate function which will does
* the real validation.
*/
int env_init(void)
{
DECLARE_GLOBAL_DATA_PTR;
gd->env_addr = (ulong)&default_environment[0];
gd->env_valid = 1;
return (0);
}
#ifdef CMD_SAVEENV
int saveenv(void)
{
int total, ret = 0;
puts ("Erasing Nand...");
if (nand_erase(nand_dev_desc + 0, CFG_ENV_OFFSET, CFG_ENV_SIZE, 0))
return 1;
puts ("Writing to Nand... ");
ret = nand_rw(nand_dev_desc + 0,
NANDRW_WRITE | NANDRW_JFFS2, CFG_ENV_OFFSET, CFG_ENV_SIZE,
&total, (u_char*)env_ptr);
if (ret || total != CFG_ENV_SIZE)
return 1;
puts ("done\n");
return ret;
}
#endif /* CMD_SAVEENV */
void env_relocate_spec (void)
{
#if !defined(ENV_IS_EMBEDDED)
int ret, total;
ret = nand_rw(nand_dev_desc + 0,
NANDRW_READ | NANDRW_JFFS2, CFG_ENV_OFFSET, CFG_ENV_SIZE,
&total, (u_char*)env_ptr);
if (ret || total != CFG_ENV_SIZE)
return use_default();
if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
return use_default();
#endif /* ! ENV_IS_EMBEDDED */
}
static void use_default()
{
DECLARE_GLOBAL_DATA_PTR;
puts ("*** Warning - bad CRC or NAND, using default environment\n\n");
if (default_environment_size > CFG_ENV_SIZE){
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;
}
#endif /* CFG_ENV_IS_IN_NAND */