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 #ifdef CONFIG_SPL_BUILD
  23 /* TODO(sjg@chromium.org): Figure out why this is needed */
  24 # if !defined(CONFIG_TARGET_AM335X_EVM) || defined(CONFIG_SPL_OS_BOOT)
  25 #  define LOADENV
  26 # endif
  27 #else
  28 # define LOADENV
  29 # if defined(CONFIG_CMD_SAVEENV)
  30 #  define CMD_SAVEENV
  31 # endif
  32 #endif
  33
  34 char *env_name_spec = "FAT";
  35
  36 env_t *env_ptr;
  37
  38 DECLARE_GLOBAL_DATA_PTR;
  39
  40 #ifdef CMD_SAVEENV
  41 static int env_fat_save(void)
  42 {
  43         env_t   env_new;
  44         struct blk_desc *dev_desc = NULL;
  45         disk_partition_t info;
  46         int dev, part;
  47         int err;
  48         loff_t size;
  49
  50         err = env_export(&env_new);
  51         if (err)
  52                 return err;
  53
  54         part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
  55                                         CONFIG_ENV_FAT_DEVICE_AND_PART,
  56                                         &dev_desc, &info, 1);
  57         if (part < 0)
  58                 return 1;
  59
  60         dev = dev_desc->devnum;
  61         if (fat_set_blk_dev(dev_desc, &info) != 0) {
  62                 printf("\n** Unable to use %s %d:%d for saveenv **\n",
  63                        CONFIG_ENV_FAT_INTERFACE, dev, part);
  64                 return 1;
  65         }
  66
  67         err = file_fat_write(CONFIG_ENV_FAT_FILE, (void *)&env_new, 0, sizeof(env_t),
  68                              &size);
  69         if (err == -1) {
  70                 printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
  71                         CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
  72                 return 1;
  73         }
  74
  75         puts("done\n");
  76         return 0;
  77 }
  78 #endif /* CMD_SAVEENV */
  79
  80 #ifdef LOADENV
  81 static void env_fat_load(void)
  82 {
  83         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
  84         struct blk_desc *dev_desc = NULL;
  85         disk_partition_t info;
  86         int dev, part;
  87         int err;
  88
  89         part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
  90                                         CONFIG_ENV_FAT_DEVICE_AND_PART,
  91                                         &dev_desc, &info, 1);
  92         if (part < 0)
  93                 goto err_env_relocate;
  94
  95         dev = dev_desc->devnum;
  96         if (fat_set_blk_dev(dev_desc, &info) != 0) {
  97                 printf("\n** Unable to use %s %d:%d for loading the env **\n",
  98                        CONFIG_ENV_FAT_INTERFACE, dev, part);
  99                 goto err_env_relocate;
 100         }
 101
 102         err = file_fat_read(CONFIG_ENV_FAT_FILE, buf, CONFIG_ENV_SIZE);
 103         if (err == -1) {
 104                 printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
 105                         CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
 106                 goto err_env_relocate;
 107         }
 108
 109         env_import(buf, 1);
 110         return;
 111
 112 err_env_relocate:
 113         set_default_env(NULL);
 114 }
 115 #endif /* LOADENV */
 116
 117 U_BOOT_ENV_LOCATION(fat) = {
 118         .location       = ENVL_FAT,
 119 #ifdef LOADENV
 120         .load           = env_fat_load,
 121 #endif
 122 #ifdef CMD_SAVEENV
 123         .save           = env_save_ptr(env_fat_save),
 124 #endif
 125 };