common/env_fat.c

   1 /*
   2  * (c) Copyright 2011 by Tigris Elektronik GmbH
   3  *
   4  * Author:
   5  *  Maximilian Schwerin <mvs@tigris.de>
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <common.h>
  11
  12 #include <command.h>
  13 #include <environment.h>
  14 #include <linux/stddef.h>
  15 #include <malloc.h>
  16 #include <search.h>
  17 #include <errno.h>
  18 #include <fat.h>
  19 #include <mmc.h>
  20
  21 char *env_name_spec = "FAT";
  22
  23 env_t *env_ptr;
  24
  25 DECLARE_GLOBAL_DATA_PTR;
  26
  27 int env_init(void)
  28 {
  29         /* use default */
  30         gd->env_addr = (ulong)&default_environment[0];
  31         gd->env_valid = 1;
  32
  33         return 0;
  34 }
  35
  36 #ifdef CONFIG_CMD_SAVEENV
  37 int saveenv(void)
  38 {
  39         env_t   env_new;
  40         block_dev_desc_t *dev_desc = NULL;
  41         disk_partition_t info;
  42         int dev, part;
  43         int err;
  44         loff_t size;
  45
  46         err = env_export(&env_new);
  47         if (err)
  48                 return err;
  49
  50         part = get_device_and_partition(FAT_ENV_INTERFACE,
  51                                         FAT_ENV_DEVICE_AND_PART,
  52                                         &dev_desc, &info, 1);
  53         if (part < 0)
  54                 return 1;
  55
  56         dev = dev_desc->dev;
  57         if (fat_set_blk_dev(dev_desc, &info) != 0) {
  58                 printf("\n** Unable to use %s %d:%d for saveenv **\n",
  59                        FAT_ENV_INTERFACE, dev, part);
  60                 return 1;
  61         }
  62
  63         err = file_fat_write(FAT_ENV_FILE, (void *)&env_new, 0, sizeof(env_t),
  64                              &size);
  65         if (err == -1) {
  66                 printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
  67                         FAT_ENV_FILE, FAT_ENV_INTERFACE, dev, part);
  68                 return 1;
  69         }
  70
  71         puts("done\n");
  72         return 0;
  73 }
  74 #endif /* CONFIG_CMD_SAVEENV */
  75
  76 void env_relocate_spec(void)
  77 {
  78         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
  79         block_dev_desc_t *dev_desc = NULL;
  80         disk_partition_t info;
  81         int dev, part;
  82         int err;
  83
  84         part = get_device_and_partition(FAT_ENV_INTERFACE,
  85                                         FAT_ENV_DEVICE_AND_PART,
  86                                         &dev_desc, &info, 1);
  87         if (part < 0)
  88                 goto err_env_relocate;
  89
  90         dev = dev_desc->dev;
  91         if (fat_set_blk_dev(dev_desc, &info) != 0) {
  92                 printf("\n** Unable to use %s %d:%d for loading the env **\n",
  93                        FAT_ENV_INTERFACE, dev, part);
  94                 goto err_env_relocate;
  95         }
  96
  97         err = file_fat_read(FAT_ENV_FILE, buf, CONFIG_ENV_SIZE);
  98         if (err == -1) {
  99                 printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
 100                         FAT_ENV_FILE, FAT_ENV_INTERFACE, dev, part);
 101                 goto err_env_relocate;
 102         }
 103
 104         env_import(buf, 1);
 105         return;
 106
 107 err_env_relocate:
 108         set_default_env(NULL);
 109 }