LXR uboot/common/env

   1/*
   2 * (c) Copyright 2011 by Tigris Elektronik GmbH
   3 *
   4 * Author:
   5 *  Maximilian Schwerin <mvs@tigris.de>
   6 *
   7 * See file CREDITS for list of people who contributed to this
   8 * project.
   9 *
  10 * This program is free software; you can redistribute it and/or
  11 * modify it under the terms of the GNU General Public License as
  12 * published by the Free Software Foundation; either version 2 of
  13 * the License, or (at your option) any later version.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 * GNU General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public License
  21 * along with this program; if not, write to the Free Software
  22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  23 * MA 02111-1307 USA
  24 */
  25
  26#include <common.h>
  27
  28#include <command.h>
  29#include <environment.h>
  30#include <linux/stddef.h>
  31#include <malloc.h>
  32#include <search.h>
  33#include <errno.h>
  34#include <fat.h>
  35#include <mmc.h>
  36
  37char *env_name_spec = "FAT";
  38
  39env_t *env_ptr;
  40
  41DECLARE_GLOBAL_DATA_PTR;
  42
  43uchar env_get_char_spec(int index)
  44{
  45        return *((uchar *)(gd->env_addr + index));
  46}
  47
  48int env_init(void)
  49{
  50        /* use default */
  51        gd->env_addr = (ulong)&default_environment[0];
  52        gd->env_valid = 1;
  53
  54        return 0;
  55}
  56
  57#ifdef CONFIG_CMD_SAVEENV
  58int saveenv(void)
  59{
  60        env_t   env_new;
  61        ssize_t len;
  62        char    *res;
  63        block_dev_desc_t *dev_desc = NULL;
  64        int dev = FAT_ENV_DEVICE;
  65        int part = FAT_ENV_PART;
  66
  67        res = (char *)&env_new.data;
  68        len = hexport_r(&env_htab, '\0', &res, ENV_SIZE, 0, NULL);
  69        if (len < 0) {
  70                error("Cannot export environment: errno = %d\n", errno);
  71                return 1;
  72        }
  73
  74#ifdef CONFIG_MMC
  75        if (strcmp (FAT_ENV_INTERFACE, "mmc") == 0) {
  76                struct mmc *mmc = find_mmc_device(dev);
  77
  78                if (!mmc) {
  79                        printf("no mmc device at slot %x\n", dev);
  80                        return 1;
  81                }
  82
  83                mmc->has_init = 0;
  84                mmc_init(mmc);
  85        }
  86#endif /* CONFIG_MMC */
  87
  88        dev_desc = get_dev(FAT_ENV_INTERFACE, dev);
  89        if (dev_desc == NULL) {
  90                printf("Failed to find %s%d\n",
  91                        FAT_ENV_INTERFACE, dev);
  92                return 1;
  93        }
  94        if (fat_register_device(dev_desc, part) != 0) {
  95                printf("Failed to register %s%d:%d\n",
  96                        FAT_ENV_INTERFACE, dev, part);
  97                return 1;
  98        }
  99
 100        env_new.crc = crc32(0, env_new.data, ENV_SIZE);
 101        if (file_fat_write(FAT_ENV_FILE, (void *)&env_new, sizeof(env_t)) == -1) {
 102                printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
 103                        FAT_ENV_FILE, FAT_ENV_INTERFACE, dev, part);
 104                return 1;
 105        }
 106
 107        puts("done\n");
 108        return 0;
 109}
 110#endif /* CONFIG_CMD_SAVEENV */
 111
 112void env_relocate_spec(void)
 113{
 114        char buf[CONFIG_ENV_SIZE];
 115        block_dev_desc_t *dev_desc = NULL;
 116        int dev = FAT_ENV_DEVICE;
 117        int part = FAT_ENV_PART;
 118
 119#ifdef CONFIG_MMC
 120        if (strcmp (FAT_ENV_INTERFACE, "mmc") == 0) {
 121                struct mmc *mmc = find_mmc_device(dev);
 122
 123                if (!mmc) {
 124                        printf("no mmc device at slot %x\n", dev);
 125                        set_default_env(NULL);
 126                        return;
 127                }
 128
 129                mmc->has_init = 0;
 130                mmc_init(mmc);
 131        }
 132#endif /* CONFIG_MMC */
 133
 134        dev_desc = get_dev(FAT_ENV_INTERFACE, dev);
 135        if (dev_desc == NULL) {
 136                printf("Failed to find %s%d\n",
 137                        FAT_ENV_INTERFACE, dev);
 138                set_default_env(NULL);
 139                return;
 140        }
 141        if (fat_register_device(dev_desc, part) != 0) {
 142                printf("Failed to register %s%d:%d\n",
 143                        FAT_ENV_INTERFACE, dev, part);
 144                set_default_env(NULL);
 145                return;
 146        }
 147
 148        if (file_fat_read(FAT_ENV_FILE, (unsigned char *)&buf, CONFIG_ENV_SIZE) == -1) {
 149                printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
 150                        FAT_ENV_FILE, FAT_ENV_INTERFACE, dev, part);
 151                set_default_env(NULL);
 152                return;
 153        }
 154
 155        env_import(buf, 1);
 156}
 157