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 <memalign.h>
  17 #include <search.h>
  18 #include <errno.h>
  19 #include <fat.h>
  20 #include <mmc.h>
  21
  22 char *env_name_spec = "FAT";
  23
  24 env_t *env_ptr;
  25
  26 DECLARE_GLOBAL_DATA_PTR;
  27
  28 int env_init(void)
  29 {
  30         /* use default */
  31         gd->env_addr = (ulong)&default_environment[0];
  32         gd->env_valid = 1;
  33
  34         return 0;
  35 }
  36
  37 #ifdef CONFIG_CMD_SAVEENV
  38 int saveenv(void)
  39 {
  40         env_t   env_new;
  41         struct blk_desc *dev_desc = NULL;
  42         disk_partition_t info;
  43         int dev, part;
  44         int err;
  45         loff_t size;
  46
  47         err = env_export(&env_new);
  48         if (err)
  49                 return err;
  50
  51         part = blk_get_device_part_str(FAT_ENV_INTERFACE,
  52                                         FAT_ENV_DEVICE_AND_PART,
  53                                         &dev_desc, &info, 1);
  54         if (part < 0)
  55                 return 1;
  56
  57         dev = dev_desc->devnum;
  58         if (fat_set_blk_dev(dev_desc, &info) != 0) {
  59                 printf("\n** Unable to use %s %d:%d for saveenv **\n",
  60                        FAT_ENV_INTERFACE, dev, part);
  61                 return 1;
  62         }
  63
  64         err = file_fat_write(FAT_ENV_FILE, (void *)&env_new, 0, sizeof(env_t),
  65                              &size);
  66         if (err == -1) {
  67                 printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
  68                         FAT_ENV_FILE, FAT_ENV_INTERFACE, dev, part);
  69                 return 1;
  70         }
  71
  72         puts("done\n");
  73         return 0;
  74 }
  75 #endif /* CONFIG_CMD_SAVEENV */
  76
  77 void env_relocate_spec(void)
  78 {
  79         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
  80         struct blk_desc *dev_desc = NULL;
  81         disk_partition_t info;
  82         int dev, part;
  83         int err;
  84
  85         part = blk_get_device_part_str(FAT_ENV_INTERFACE,
  86                                         FAT_ENV_DEVICE_AND_PART,
  87                                         &dev_desc, &info, 1);
  88         if (part < 0)
  89                 goto err_env_relocate;
  90
  91         dev = dev_desc->devnum;
  92         if (fat_set_blk_dev(dev_desc, &info) != 0) {
  93                 printf("\n** Unable to use %s %d:%d for loading the env **\n",
  94                        FAT_ENV_INTERFACE, dev, part);
  95                 goto err_env_relocate;
  96         }
  97
  98         err = file_fat_read(FAT_ENV_FILE, buf, CONFIG_ENV_SIZE);
  99         if (err == -1) {
 100                 printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
 101                         FAT_ENV_FILE, FAT_ENV_INTERFACE, dev, part);
 102                 goto err_env_relocate;
 103         }
 104
 105         env_import(buf, 1);
 106         return;
 107
 108 err_env_relocate:
 109         set_default_env(NULL);
 110 }