mirror of
https://github.com/AsahiLinux/u-boot
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4036b6301e
This allows MMC drivers to perform cache flusing on the bufffers without issue. Signed-off-by: Stephen Warren <swarren@nvidia.com> Cc: Andy Fleming <afleming@gmail.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
155 lines
3.7 KiB
C
155 lines
3.7 KiB
C
/*
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* (C) Copyright 2008-2011 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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char *env_name_spec = "MMC";
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#ifdef ENV_IS_EMBEDDED
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env_t *env_ptr = &environment;
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#else /* ! ENV_IS_EMBEDDED */
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env_t *env_ptr;
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#endif /* ENV_IS_EMBEDDED */
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DECLARE_GLOBAL_DATA_PTR;
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#if !defined(CONFIG_ENV_OFFSET)
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#define CONFIG_ENV_OFFSET 0
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#endif
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static int __mmc_get_env_addr(struct mmc *mmc, u32 *env_addr)
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{
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*env_addr = CONFIG_ENV_OFFSET;
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return 0;
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}
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int mmc_get_env_addr(struct mmc *mmc, u32 *env_addr)
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__attribute__((weak, alias("__mmc_get_env_addr")));
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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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static 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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static 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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ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
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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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u32 offset;
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if (init_mmc_for_env(mmc) || mmc_get_env_addr(mmc, &offset))
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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, 0, NULL);
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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[0], 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, 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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static 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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ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
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struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
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u32 offset;
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if (init_mmc_for_env(mmc) || mmc_get_env_addr(mmc, &offset))
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return set_default_env(NULL);
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if (read_env(mmc, CONFIG_ENV_SIZE, offset, buf))
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return set_default_env(NULL);
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env_import(buf, 1);
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#endif
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}
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