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100 lines
2.7 KiB
C
100 lines
2.7 KiB
C
/* LowLevel function for DataFlash environment support
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* Author : Gilles Gastaldi (Atmel)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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*/
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#include <common.h>
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#include <command.h>
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#include <environment.h>
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#include <linux/stddef.h>
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#include <dataflash.h>
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DECLARE_GLOBAL_DATA_PTR;
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env_t *env_ptr = NULL;
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char * env_name_spec = "dataflash";
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extern int read_dataflash (unsigned long addr, unsigned long size, char
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*result);
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extern int write_dataflash (unsigned long addr_dest, unsigned long addr_src,
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unsigned long size);
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extern int AT91F_DataflashInit (void);
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extern uchar default_environment[];
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/* extern int default_environment_size; */
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uchar env_get_char_spec (int index)
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{
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uchar c;
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read_dataflash(CONFIG_ENV_ADDR + index + offsetof(env_t,data),
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1, (char *)&c);
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return (c);
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}
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void env_relocate_spec (void)
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{
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read_dataflash(CONFIG_ENV_ADDR, CONFIG_ENV_SIZE, (char *)env_ptr);
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}
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int saveenv(void)
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{
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/* env must be copied to do not alter env structure in memory*/
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unsigned char temp[CONFIG_ENV_SIZE];
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memcpy(temp, env_ptr, CONFIG_ENV_SIZE);
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return write_dataflash(CONFIG_ENV_ADDR, (unsigned long)temp, CONFIG_ENV_SIZE);
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}
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/************************************************************************
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* Initialize Environment use
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*
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* We are still running from ROM, so data use is limited
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* Use a (moderately small) buffer on the stack
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*/
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int env_init(void)
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{
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ulong crc, len, new;
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unsigned off;
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uchar buf[64];
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if (gd->env_valid == 0){
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AT91F_DataflashInit(); /* prepare for DATAFLASH read/write */
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/* read old CRC */
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read_dataflash(CONFIG_ENV_ADDR + offsetof(env_t, crc),
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sizeof(ulong), (char *)&crc);
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new = 0;
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len = ENV_SIZE;
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off = offsetof(env_t,data);
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while (len > 0) {
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int n = (len > sizeof(buf)) ? sizeof(buf) : len;
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read_dataflash(CONFIG_ENV_ADDR + off, n, (char *)buf);
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new = crc32 (new, buf, n);
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len -= n;
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off += n;
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}
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if (crc == new) {
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gd->env_addr = offsetof(env_t,data);
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gd->env_valid = 1;
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} else {
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gd->env_addr = (ulong)&default_environment[0];
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gd->env_valid = 0;
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}
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}
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return (0);
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}
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