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/*
* LowLevel function for DataFlash environment support
* Author : Gilles Gastaldi (Atmel)
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <command.h>
#include <environment.h>
#include <linux/stddef.h>
#include <dataflash.h>
#include <search.h>
#include <errno.h>
DECLARE_GLOBAL_DATA_PTR;
env_t *env_ptr;
char *env_name_spec = "dataflash";
uchar env_get_char_spec(int index)
{
uchar c;
read_dataflash(CONFIG_ENV_ADDR + index + offsetof(env_t, data),
1, (char *)&c);
return c;
}
void env_relocate_spec(void)
{
char buf[CONFIG_ENV_SIZE];
read_dataflash(CONFIG_ENV_ADDR, CONFIG_ENV_SIZE, buf);
env_import(buf, 1);
}
#ifdef CONFIG_ENV_OFFSET_REDUND
#error No support for redundant environment on dataflash yet!
#endif
int saveenv(void)
{
env_t env_new;
ssize_t len;
char *res;
res = (char *)&env_new.data;
len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
if (len < 0) {
error("Cannot export environment: errno = %d\n", errno);
return 1;
}
env_new.crc = crc32(0, env_new.data, ENV_SIZE);
return write_dataflash(CONFIG_ENV_ADDR,
(unsigned long)&env_new,
CONFIG_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 = ENV_SIZE, new = 0;
unsigned off;
uchar buf[64];
if (gd->env_valid)
return 0;
AT91F_DataflashInit(); /* prepare for DATAFLASH read/write */
/* read old CRC */
read_dataflash(CONFIG_ENV_ADDR + offsetof(env_t, crc),
sizeof(ulong), (char *)&crc);
off = offsetof(env_t, data);
while (len > 0) {
int n = (len > sizeof(buf)) ? sizeof(buf) : len;
read_dataflash(CONFIG_ENV_ADDR + off, n, (char *)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;
}
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