b218ccb543
Instead of defining the flags sevaral times in different source files (which is error prone), move them to a central place in a header file. Signed-off-by: Wolfgang Denk <wd@denx.de>
279 lines
6.4 KiB
C
279 lines
6.4 KiB
C
/*
|
|
* (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>
|
|
|
|
* 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 <command.h>
|
|
#include <environment.h>
|
|
#include <linux/stddef.h>
|
|
#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
|
|
#include <i2c.h>
|
|
#endif
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
env_t *env_ptr = NULL;
|
|
|
|
char * env_name_spec = "EEPROM";
|
|
int env_eeprom_bus = -1;
|
|
|
|
static int eeprom_bus_read (unsigned dev_addr, unsigned offset, uchar *buffer,
|
|
unsigned cnt)
|
|
{
|
|
int rcode;
|
|
#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
|
|
int old_bus = i2c_get_bus_num();
|
|
|
|
if (gd->flags & GD_FLG_RELOC) {
|
|
if (env_eeprom_bus == -1) {
|
|
I2C_MUX_DEVICE *dev = NULL;
|
|
dev = i2c_mux_ident_muxstring(
|
|
(uchar *)CONFIG_I2C_ENV_EEPROM_BUS);
|
|
if (dev != NULL) {
|
|
env_eeprom_bus = dev->busid;
|
|
} else
|
|
printf ("error adding env eeprom bus.\n");
|
|
}
|
|
if (old_bus != env_eeprom_bus) {
|
|
i2c_set_bus_num(env_eeprom_bus);
|
|
old_bus = env_eeprom_bus;
|
|
}
|
|
} else {
|
|
rcode = i2c_mux_ident_muxstring_f(
|
|
(uchar *)CONFIG_I2C_ENV_EEPROM_BUS);
|
|
}
|
|
#endif
|
|
|
|
rcode = eeprom_read (dev_addr, offset, buffer, cnt);
|
|
#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
|
|
if (old_bus != env_eeprom_bus)
|
|
i2c_set_bus_num(old_bus);
|
|
#endif
|
|
return rcode;
|
|
}
|
|
|
|
static int eeprom_bus_write (unsigned dev_addr, unsigned offset, uchar *buffer,
|
|
unsigned cnt)
|
|
{
|
|
int rcode;
|
|
#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
|
|
int old_bus = i2c_get_bus_num();
|
|
|
|
rcode = i2c_mux_ident_muxstring_f((uchar *)CONFIG_I2C_ENV_EEPROM_BUS);
|
|
#endif
|
|
rcode = eeprom_write (dev_addr, offset, buffer, cnt);
|
|
#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
|
|
i2c_set_bus_num(old_bus);
|
|
#endif
|
|
return rcode;
|
|
}
|
|
|
|
uchar env_get_char_spec (int index)
|
|
{
|
|
uchar c;
|
|
unsigned int off;
|
|
off = CONFIG_ENV_OFFSET;
|
|
#ifdef CONFIG_ENV_OFFSET_REDUND
|
|
if (gd->env_valid == 2)
|
|
off = CONFIG_ENV_OFFSET_REDUND;
|
|
#endif
|
|
|
|
eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR,
|
|
off + index + offsetof(env_t,data),
|
|
&c, 1);
|
|
|
|
return (c);
|
|
}
|
|
|
|
void env_relocate_spec (void)
|
|
{
|
|
unsigned int off = CONFIG_ENV_OFFSET;
|
|
#ifdef CONFIG_ENV_OFFSET_REDUND
|
|
if (gd->env_valid == 2)
|
|
off = CONFIG_ENV_OFFSET_REDUND;
|
|
#endif
|
|
eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR,
|
|
off,
|
|
(uchar*)env_ptr,
|
|
CONFIG_ENV_SIZE);
|
|
}
|
|
|
|
int saveenv(void)
|
|
{
|
|
int rc;
|
|
unsigned int off = CONFIG_ENV_OFFSET;
|
|
#ifdef CONFIG_ENV_OFFSET_REDUND
|
|
unsigned int off_red = CONFIG_ENV_OFFSET_REDUND;
|
|
char flag_obsolete = OBSOLETE_FLAG;
|
|
if (gd->env_valid == 1) {
|
|
off = CONFIG_ENV_OFFSET_REDUND;
|
|
off_red = CONFIG_ENV_OFFSET;
|
|
}
|
|
|
|
env_ptr->flags = ACTIVE_FLAG;
|
|
#endif
|
|
|
|
rc = eeprom_bus_write (CONFIG_SYS_DEF_EEPROM_ADDR,
|
|
off,
|
|
(uchar *)env_ptr,
|
|
CONFIG_ENV_SIZE);
|
|
|
|
#ifdef CONFIG_ENV_OFFSET_REDUND
|
|
if (rc == 0) {
|
|
eeprom_bus_write (CONFIG_SYS_DEF_EEPROM_ADDR,
|
|
off_red + offsetof(env_t,flags),
|
|
(uchar *)&flag_obsolete,
|
|
1);
|
|
if (gd->env_valid == 1)
|
|
gd->env_valid = 2;
|
|
else
|
|
gd->env_valid = 1;
|
|
|
|
}
|
|
#endif
|
|
|
|
return rc;
|
|
}
|
|
|
|
/************************************************************************
|
|
* Initialize Environment use
|
|
*
|
|
* We are still running from ROM, so data use is limited
|
|
* Use a (moderately small) buffer on the stack
|
|
*/
|
|
|
|
#ifdef CONFIG_ENV_OFFSET_REDUND
|
|
int env_init(void)
|
|
{
|
|
ulong len;
|
|
ulong crc[2], crc_tmp;
|
|
unsigned int off, off_env[2];
|
|
uchar buf[64];
|
|
int crc_ok[2] = {0,0};
|
|
unsigned char flags[2];
|
|
int i;
|
|
|
|
eeprom_init (); /* prepare for EEPROM read/write */
|
|
|
|
off_env[0] = CONFIG_ENV_OFFSET;
|
|
off_env[1] = CONFIG_ENV_OFFSET_REDUND;
|
|
|
|
for (i = 0; i < 2; i++) {
|
|
/* read CRC */
|
|
eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR,
|
|
off_env[i] + offsetof(env_t,crc),
|
|
(uchar *)&crc[i], sizeof(ulong));
|
|
/* read FLAGS */
|
|
eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR,
|
|
off_env[i] + offsetof(env_t,flags),
|
|
(uchar *)&flags[i], sizeof(uchar));
|
|
|
|
crc_tmp= 0;
|
|
len = ENV_SIZE;
|
|
off = off_env[i] + offsetof(env_t,data);
|
|
while (len > 0) {
|
|
int n = (len > sizeof(buf)) ? sizeof(buf) : len;
|
|
|
|
eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR, off,
|
|
buf, n);
|
|
|
|
crc_tmp = crc32 (crc_tmp, buf, n);
|
|
len -= n;
|
|
off += n;
|
|
}
|
|
if (crc_tmp == crc[i])
|
|
crc_ok[i] = 1;
|
|
}
|
|
|
|
if (!crc_ok[0] && !crc_ok[1]) {
|
|
gd->env_addr = 0;
|
|
gd->env_valid = 0;
|
|
|
|
return 0;
|
|
} else if (crc_ok[0] && !crc_ok[1]) {
|
|
gd->env_valid = 1;
|
|
}
|
|
else if (!crc_ok[0] && crc_ok[1]) {
|
|
gd->env_valid = 2;
|
|
} else {
|
|
/* both ok - check serial */
|
|
if (flags[0] == ACTIVE_FLAG && flags[1] == OBSOLETE_FLAG)
|
|
gd->env_valid = 1;
|
|
else if (flags[0] == OBSOLETE_FLAG && flags[1] == ACTIVE_FLAG)
|
|
gd->env_valid = 2;
|
|
else if (flags[0] == 0xFF && flags[1] == 0)
|
|
gd->env_valid = 2;
|
|
else if(flags[1] == 0xFF && flags[0] == 0)
|
|
gd->env_valid = 1;
|
|
else /* flags are equal - almost impossible */
|
|
gd->env_valid = 1;
|
|
}
|
|
|
|
if (gd->env_valid == 2)
|
|
gd->env_addr = off_env[1] + offsetof(env_t,data);
|
|
else if (gd->env_valid == 1)
|
|
gd->env_addr = off_env[0] + offsetof(env_t,data);
|
|
|
|
return (0);
|
|
}
|
|
#else
|
|
int env_init(void)
|
|
{
|
|
ulong crc, len, new;
|
|
unsigned off;
|
|
uchar buf[64];
|
|
|
|
eeprom_init (); /* prepare for EEPROM read/write */
|
|
|
|
/* read old CRC */
|
|
eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR,
|
|
CONFIG_ENV_OFFSET+offsetof(env_t,crc),
|
|
(uchar *)&crc, sizeof(ulong));
|
|
|
|
new = 0;
|
|
len = ENV_SIZE;
|
|
off = offsetof(env_t,data);
|
|
while (len > 0) {
|
|
int n = (len > sizeof(buf)) ? sizeof(buf) : len;
|
|
|
|
eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR,
|
|
CONFIG_ENV_OFFSET + off, buf, n);
|
|
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 = 0;
|
|
gd->env_valid = 0;
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
#endif
|