168 lines
3.6 KiB
C
168 lines
3.6 KiB
C
/*
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* (C) Copyright 2008-2010 Freescale Semiconductor, Inc.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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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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/* #define DEBUG */
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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 <malloc.h>
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#include <mmc.h>
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#include <search.h>
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#include <errno.h>
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/* references to names in env_common.c */
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extern uchar default_environment[];
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char *env_name_spec = "MMC";
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#ifdef ENV_IS_EMBEDDED
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extern uchar environment[];
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env_t *env_ptr = (env_t *)(&environment[0]);
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#else /* ! ENV_IS_EMBEDDED */
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env_t *env_ptr = NULL;
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#endif /* ENV_IS_EMBEDDED */
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/* local functions */
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#if !defined(ENV_IS_EMBEDDED)
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static void use_default(void);
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#endif
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DECLARE_GLOBAL_DATA_PTR;
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uchar env_get_char_spec(int index)
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{
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return *((uchar *)(gd->env_addr + index));
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}
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int env_init(void)
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{
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/* use default */
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gd->env_addr = (ulong)&default_environment[0];
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gd->env_valid = 1;
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return 0;
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}
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int init_mmc_for_env(struct mmc *mmc)
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{
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if (!mmc) {
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puts("No MMC card found\n");
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return -1;
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}
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if (mmc_init(mmc)) {
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puts("MMC init failed\n");
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return -1;
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}
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return 0;
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}
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#ifdef CONFIG_CMD_SAVEENV
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inline int write_env(struct mmc *mmc, unsigned long size,
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unsigned long offset, const void *buffer)
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{
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uint blk_start, blk_cnt, n;
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blk_start = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
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blk_cnt = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
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n = mmc->block_dev.block_write(CONFIG_SYS_MMC_ENV_DEV, blk_start,
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blk_cnt, (u_char *)buffer);
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return (n == blk_cnt) ? 0 : -1;
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}
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int saveenv(void)
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{
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env_t env_new;
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ssize_t len;
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char *res;
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struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
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if (init_mmc_for_env(mmc))
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return 1;
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res = (char *)&env_new.data;
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len = hexport_r(&env_htab, '\0', &res, ENV_SIZE);
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if (len < 0) {
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error("Cannot export environment: errno = %d\n", errno);
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return 1;
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}
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env_new.crc = crc32(0, env_new.data, ENV_SIZE);
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printf("Writing to MMC(%d)... ", CONFIG_SYS_MMC_ENV_DEV);
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if (write_env(mmc, CONFIG_ENV_SIZE, CONFIG_ENV_OFFSET, (u_char *)&env_new)) {
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puts("failed\n");
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return 1;
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}
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puts("done\n");
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return 0;
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}
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#endif /* CONFIG_CMD_SAVEENV */
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inline int read_env(struct mmc *mmc, unsigned long size,
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unsigned long offset, const void *buffer)
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{
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uint blk_start, blk_cnt, n;
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blk_start = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
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blk_cnt = ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len;
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n = mmc->block_dev.block_read(CONFIG_SYS_MMC_ENV_DEV, blk_start,
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blk_cnt, (uchar *)buffer);
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return (n == blk_cnt) ? 0 : -1;
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}
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void env_relocate_spec(void)
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{
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#if !defined(ENV_IS_EMBEDDED)
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char buf[CONFIG_ENV_SIZE];
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struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
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if (init_mmc_for_env(mmc)) {
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use_default();
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return;
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}
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if (read_env(mmc, CONFIG_ENV_SIZE, CONFIG_ENV_OFFSET, buf)) {
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use_default();
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return;
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}
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env_import(buf, 1);
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#endif
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}
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#if !defined(ENV_IS_EMBEDDED)
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static void use_default()
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{
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set_default_env(NULL);
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}
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#endif
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