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 DECLARE_GLOBAL_DATA_PTR;
  35
  36 #ifdef CMD_SAVEENV
  37 static int env_fat_save(void)
  38 {
  39         env_t   env_new;
  40         struct blk_desc *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 = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
  51                                         CONFIG_ENV_FAT_DEVICE_AND_PART,
  52                                         &dev_desc, &info, 1);
  53         if (part < 0)
  54                 return 1;
  55
  56         dev = dev_desc->devnum;
  57         if (fat_set_blk_dev(dev_desc, &info) != 0) {
  58                 printf("\n** Unable to use %s %d:%d for saveenv **\n",
  59                        CONFIG_ENV_FAT_INTERFACE, dev, part);
  60                 return 1;
  61         }
  62
  63         err = file_fat_write(CONFIG_ENV_FAT_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                         CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
  68                 return 1;
  69         }
  70
  71         puts("done\n");
  72         return 0;
  73 }
  74 #endif /* CMD_SAVEENV */
  75
  76 #ifdef LOADENV
  77 static int env_fat_load(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(CONFIG_ENV_FAT_INTERFACE,
  86                                         CONFIG_ENV_FAT_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                        CONFIG_ENV_FAT_INTERFACE, dev, part);
  95                 goto err_env_relocate;
  96         }
  97
  98         err = file_fat_read(CONFIG_ENV_FAT_FILE, buf, CONFIG_ENV_SIZE);
  99         if (err == -1) {
 100                 printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
 101                         CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
 102                 goto err_env_relocate;
 103         }
 104
 105         env_import(buf, 1);
 106         return 0;
 107
 108 err_env_relocate:
 109         set_default_env(NULL);
 110
 111         return -EIO;
 112 }
 113 #endif /* LOADENV */
 114
 115 U_BOOT_ENV_LOCATION(fat) = {
 116         .location       = ENVL_FAT,
 117         ENV_NAME("FAT")
 118 #ifdef LOADENV
 119         .load           = env_fat_load,
 120 #endif
 121 #ifdef CMD_SAVEENV
 122         .save           = env_save_ptr(env_fat_save),
 123 #endif
 124 };