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env, eeprom: add redundant environment support 

Add redundant environment support for environment lying on a EEPROM.

Tested on uppcoming suen3 support

Signed-off-by: Andreas Huber <andreas.huber@keymile.com>
This commit is contained in:
Heiko Schocher 2010-01-07 08:55:44 +01:00 committed by Wolfgang Denk
parent 548738b4d4
commit 1567b596d9
1 changed files with 127 additions and 4 deletions
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131
common/env_eeprom.c
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@ -32,6 +32,11 @@
#include <i2c.h>
#endif
#ifdef CONFIG_ENV_OFFSET_REDUND
#define ACTIVE_FLAG 1
#define OBSOLETE_FLAG 0
#endif
DECLARE_GLOBAL_DATA_PTR;
env_t *env_ptr = NULL;
@ -93,9 +98,15 @@ static int eeprom_bus_write (unsigned dev_addr, unsigned offset, uchar *buffer,
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,
CONFIG_ENV_OFFSET+index+offsetof(env_t,data),
off + index + offsetof(env_t,data),
&c, 1);
return (c);
@ -103,18 +114,52 @@ uchar env_get_char_spec (int index)
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,
CONFIG_ENV_OFFSET,
off,
(uchar*)env_ptr,
CONFIG_ENV_SIZE);
}
int saveenv(void)
{
return eeprom_bus_write (CONFIG_SYS_DEF_EEPROM_ADDR,
CONFIG_ENV_OFFSET,
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;
}
/************************************************************************
@ -123,6 +168,82 @@ int saveenv(void)
* 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;
@ -159,3 +280,5 @@ int env_init(void)
return (0);
}
#endif