common/env_fat.c

   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
  37 char *env_name_spec = "FAT";
  38
  39 env_t *env_ptr;
  40
  41 DECLARE_GLOBAL_DATA_PTR;
  42
  43 int env_init(void)
  44 {
  45         /* use default */
  46         gd->env_addr = (ulong)&default_environment[0];
  47         gd->env_valid = 1;
  48
  49         return 0;
  50 }
  51
  52 #ifdef CONFIG_CMD_SAVEENV
  53 int saveenv(void)
  54 {
  55         env_t   env_new;
  56         ssize_t len;
  57         char    *res;
  58         block_dev_desc_t *dev_desc = NULL;
  59         int dev = FAT_ENV_DEVICE;
  60         int part = FAT_ENV_PART;
  61         int err;
  62
  63         res = (char *)&env_new.data;
  64         len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
  65         if (len < 0) {
  66                 error("Cannot export environment: errno = %d\n", errno);
  67                 return 1;
  68         }
  69
  70 #ifdef CONFIG_MMC
  71         if (strcmp(FAT_ENV_INTERFACE, "mmc") == 0) {
  72                 struct mmc *mmc = find_mmc_device(dev);
  73
  74                 if (!mmc) {
  75                         printf("no mmc device at slot %x\n", dev);
  76                         return 1;
  77                 }
  78
  79                 mmc->has_init = 0;
  80                 mmc_init(mmc);
  81         }
  82 #endif /* CONFIG_MMC */
  83
  84         dev_desc = get_dev(FAT_ENV_INTERFACE, dev);
  85         if (dev_desc == NULL) {
  86                 printf("Failed to find %s%d\n",
  87                         FAT_ENV_INTERFACE, dev);
  88                 return 1;
  89         }
  90
  91         err = fat_register_device(dev_desc, part);
  92         if (err) {
  93                 printf("Failed to register %s%d:%d\n",
  94                         FAT_ENV_INTERFACE, dev, part);
  95                 return 1;
  96         }
  97
  98         env_new.crc = crc32(0, env_new.data, ENV_SIZE);
  99         err = file_fat_write(FAT_ENV_FILE, (void *)&env_new, sizeof(env_t));
 100         if (err == -1) {
 101                 printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
 102                         FAT_ENV_FILE, FAT_ENV_INTERFACE, dev, part);
 103                 return 1;
 104         }
 105
 106         puts("done\n");
 107         return 0;
 108 }
 109 #endif /* CONFIG_CMD_SAVEENV */
 110
 111 void env_relocate_spec(void)
 112 {
 113         char buf[CONFIG_ENV_SIZE];
 114         block_dev_desc_t *dev_desc = NULL;
 115         int dev = FAT_ENV_DEVICE;
 116         int part = FAT_ENV_PART;
 117         int err;
 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
 142         err = fat_register_device(dev_desc, part);
 143         if (err) {
 144                 printf("Failed to register %s%d:%d\n",
 145                         FAT_ENV_INTERFACE, dev, part);
 146                 set_default_env(NULL);
 147                 return;
 148         }
 149
 150         err = file_fat_read(FAT_ENV_FILE, (uchar *)&buf, CONFIG_ENV_SIZE);
 151         if (err == -1) {
 152                 printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
 153                         FAT_ENV_FILE, FAT_ENV_INTERFACE, dev, part);
 154                 set_default_env(NULL);
 155                 return;
 156         }
 157
 158         env_import(buf, 1);
 159 }