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u-boot/common/env_nand.c
Guennadi Liakhovetski c3db8c649c NAND: Do not write or read a whole block if it is larger than the environment 
Environment can be smaller than NAND block size, do not need to read a whole
block and minimum for writing is one page. Also remove an unused variable.

Signed-off-by: Guennadi Liakhovetski <lg@denx.de>
Signed-off-by: Scott Wood <scottwood@freescale.com>
2008-08-12 11:31:29 -05:00

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/*
* (C) Copyright 2008
* Stuart Wood, Lab X Technologies <stuart.wood@labxtechnologies.com>
*
* (C) Copyright 2004
* Jian Zhang, Texas Instruments, jzhang@ti.com.
* (C) Copyright 2000-2006
* 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 <malloc.h>
#include <nand.h>
#if defined(CONFIG_CMD_ENV) && defined(CONFIG_CMD_NAND)
#define CMD_SAVEENV
#elif defined(CFG_ENV_OFFSET_REDUND)
#error Cannot use CFG_ENV_OFFSET_REDUND without CONFIG_CMD_ENV & CONFIG_CMD_NAND
#endif
#if defined(CFG_ENV_SIZE_REDUND) && (CFG_ENV_SIZE_REDUND != CFG_ENV_SIZE)
#error CFG_ENV_SIZE_REDUND should be the same as CFG_ENV_SIZE
#endif
#ifdef CONFIG_INFERNO
#error CONFIG_INFERNO not supported yet
#endif
#ifndef CFG_ENV_RANGE
#define CFG_ENV_RANGE CFG_ENV_SIZE
#endif
int nand_legacy_rw (struct nand_chip* nand, int cmd,
size_t start, size_t len,
size_t * retlen, u_char * buf);
/* 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 */
env_t *env_ptr = 0;
#endif /* ENV_IS_EMBEDDED */
/* local functions */
#if !defined(ENV_IS_EMBEDDED)
static void use_default(void);
#endif
DECLARE_GLOBAL_DATA_PTR;
uchar env_get_char_spec (int index)
{
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 does the real
* validation.
*
* When using a NAND boot image (like sequoia_nand), the environment
* can be embedded or attached to the U-Boot image in NAND flash. This way
* the SPL loads not only the U-Boot image from NAND but also the
* environment.
*/
int env_init(void)
{
#if defined(ENV_IS_EMBEDDED)
size_t total;
int crc1_ok = 0, crc2_ok = 0;
env_t *tmp_env1, *tmp_env2;
total = CFG_ENV_SIZE;
tmp_env1 = env_ptr;
tmp_env2 = (env_t *)((ulong)env_ptr + CFG_ENV_SIZE);
crc1_ok = (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
crc2_ok = (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
if (!crc1_ok && !crc2_ok)
gd->env_valid = 0;
else if(crc1_ok && !crc2_ok)
gd->env_valid = 1;
else if(!crc1_ok && crc2_ok)
gd->env_valid = 2;
else {
/* both ok - check serial */
if(tmp_env1->flags == 255 && tmp_env2->flags == 0)
gd->env_valid = 2;
else if(tmp_env2->flags == 255 && tmp_env1->flags == 0)
gd->env_valid = 1;
else if(tmp_env1->flags > tmp_env2->flags)
gd->env_valid = 1;
else if(tmp_env2->flags > tmp_env1->flags)
gd->env_valid = 2;
else /* flags are equal - almost impossible */
gd->env_valid = 1;
}
if (gd->env_valid == 1)
env_ptr = tmp_env1;
else if (gd->env_valid == 2)
env_ptr = tmp_env2;
#else /* ENV_IS_EMBEDDED */
gd->env_addr = (ulong)&default_environment[0];
gd->env_valid = 1;
#endif /* ENV_IS_EMBEDDED */
return (0);
}
#ifdef CMD_SAVEENV
/*
* The legacy NAND code saved the environment in the first NAND device i.e.,
* nand_dev_desc + 0. This is also the behaviour using the new NAND code.
*/
int writeenv(size_t offset, u_char *buf)
{
size_t end = offset + CFG_ENV_RANGE;
size_t amount_saved = 0;
size_t blocksize, len;
u_char *char_ptr;
blocksize = nand_info[0].erasesize;
len = min(blocksize, CFG_ENV_SIZE);
while (amount_saved < CFG_ENV_SIZE && offset < end) {
if (nand_block_isbad(&nand_info[0], offset)) {
offset += blocksize;
} else {
char_ptr = &buf[amount_saved];
if (nand_write(&nand_info[0], offset, &len,
char_ptr))
return 1;
offset += blocksize;
amount_saved += len;
}
}
if (amount_saved != CFG_ENV_SIZE)
return 1;
return 0;
}
#ifdef CFG_ENV_OFFSET_REDUND
int saveenv(void)
{
size_t total;
int ret = 0;
nand_erase_options_t nand_erase_options;
env_ptr->flags++;
total = CFG_ENV_SIZE;
nand_erase_options.length = CFG_ENV_RANGE;
nand_erase_options.quiet = 0;
nand_erase_options.jffs2 = 0;
nand_erase_options.scrub = 0;
if (CFG_ENV_RANGE < CFG_ENV_SIZE)
return 1;
if(gd->env_valid == 1) {
puts ("Erasing redundant Nand...\n");
nand_erase_options.offset = CFG_ENV_OFFSET_REDUND;
if (nand_erase_opts(&nand_info[0], &nand_erase_options))
return 1;
puts ("Writing to redundant Nand... ");
ret = writeenv(CFG_ENV_OFFSET_REDUND, (u_char *) env_ptr);
} else {
puts ("Erasing Nand...\n");
nand_erase_options.offset = CFG_ENV_OFFSET;
if (nand_erase_opts(&nand_info[0], &nand_erase_options))
return 1;
puts ("Writing to Nand... ");
ret = writeenv(CFG_ENV_OFFSET, (u_char *) env_ptr);
}
if (ret) {
puts("FAILED!\n");
return 1;
}
puts ("done\n");
gd->env_valid = (gd->env_valid == 2 ? 1 : 2);
return ret;
}
#else /* ! CFG_ENV_OFFSET_REDUND */
int saveenv(void)
{
size_t total;
int ret = 0;
nand_erase_options_t nand_erase_options;
nand_erase_options.length = CFG_ENV_RANGE;
nand_erase_options.quiet = 0;
nand_erase_options.jffs2 = 0;
nand_erase_options.scrub = 0;
nand_erase_options.offset = CFG_ENV_OFFSET;
if (CFG_ENV_RANGE < CFG_ENV_SIZE)
return 1;
puts ("Erasing Nand...\n");
if (nand_erase_opts(&nand_info[0], &nand_erase_options))
return 1;
puts ("Writing to Nand... ");
total = CFG_ENV_SIZE;
if (writeenv(CFG_ENV_OFFSET, (u_char *) env_ptr)) {
puts("FAILED!\n");
return 1;
}
puts ("done\n");
return ret;
}
#endif /* CFG_ENV_OFFSET_REDUND */
#endif /* CMD_SAVEENV */
int readenv (size_t offset, u_char * buf)
{
size_t end = offset + CFG_ENV_RANGE;
size_t amount_loaded = 0;
size_t blocksize, len;
u_char *char_ptr;
blocksize = nand_info[0].erasesize;
len = min(blocksize, CFG_ENV_SIZE);
while (amount_loaded < CFG_ENV_SIZE && offset < end) {
if (nand_block_isbad(&nand_info[0], offset)) {
offset += blocksize;
} else {
char_ptr = &buf[amount_loaded];
if (nand_read(&nand_info[0], offset, &len, char_ptr))
return 1;
offset += blocksize;
amount_loaded += len;
}
}
if (amount_loaded != CFG_ENV_SIZE)
return 1;
return 0;
}
#ifdef CFG_ENV_OFFSET_REDUND
void env_relocate_spec (void)
{
#if !defined(ENV_IS_EMBEDDED)
size_t total;
int crc1_ok = 0, crc2_ok = 0;
env_t *tmp_env1, *tmp_env2;
total = CFG_ENV_SIZE;
tmp_env1 = (env_t *) malloc(CFG_ENV_SIZE);
tmp_env2 = (env_t *) malloc(CFG_ENV_SIZE);
if (readenv(CFG_ENV_OFFSET, (u_char *) tmp_env1))
puts("No Valid Environment Area Found\n");
if (readenv(CFG_ENV_OFFSET_REDUND, (u_char *) tmp_env2))
puts("No Valid Reundant Environment Area Found\n");
crc1_ok = (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
crc2_ok = (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
if(!crc1_ok && !crc2_ok)
return use_default();
else if(crc1_ok && !crc2_ok)
gd->env_valid = 1;
else if(!crc1_ok && crc2_ok)
gd->env_valid = 2;
else {
/* both ok - check serial */
if(tmp_env1->flags == 255 && tmp_env2->flags == 0)
gd->env_valid = 2;
else if(tmp_env2->flags == 255 && tmp_env1->flags == 0)
gd->env_valid = 1;
else if(tmp_env1->flags > tmp_env2->flags)
gd->env_valid = 1;
else if(tmp_env2->flags > tmp_env1->flags)
gd->env_valid = 2;
else /* flags are equal - almost impossible */
gd->env_valid = 1;
}
free(env_ptr);
if(gd->env_valid == 1) {
env_ptr = tmp_env1;
free(tmp_env2);
} else {
env_ptr = tmp_env2;
free(tmp_env1);
}
#endif /* ! ENV_IS_EMBEDDED */
}
#else /* ! CFG_ENV_OFFSET_REDUND */
/*
* The legacy NAND code saved the environment in the first NAND device i.e.,
* nand_dev_desc + 0. This is also the behaviour using the new NAND code.
*/
void env_relocate_spec (void)
{
#if !defined(ENV_IS_EMBEDDED)
int ret;
ret = readenv(CFG_ENV_OFFSET, (u_char *) env_ptr);
if (ret)
return use_default();
if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
return use_default();
#endif /* ! ENV_IS_EMBEDDED */
}
#endif /* CFG_ENV_OFFSET_REDUND */
#if !defined(ENV_IS_EMBEDDED)
static void use_default()
{
puts ("*** Warning - bad CRC or NAND, using default environment\n\n");
set_default_env();
}
#endif
#endif /* CFG_ENV_IS_IN_NAND */
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