git.sur5r.net Git - u-boot/blob - 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 env_t *env_ptr;
  35
  36 DECLARE_GLOBAL_DATA_PTR;
  37
  38 #ifdef CMD_SAVEENV
  39 static int env_fat_save(void)
  40 {
  41         env_t   env_new;
  42         struct blk_desc *dev_desc = NULL;
  43         disk_partition_t info;
  44         int dev, part;
  45         int err;
  46         loff_t size;
  47
  48         err = env_export(&env_new);
  49         if (err)
  50                 return err;
  51
  52         part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
  53                                         CONFIG_ENV_FAT_DEVICE_AND_PART,
  54                                         &dev_desc, &info, 1);
  55         if (part < 0)
  56                 return 1;
  57
  58         dev = dev_desc->devnum;
  59         if (fat_set_blk_dev(dev_desc, &info) != 0) {
  60                 printf("\n** Unable to use %s %d:%d for saveenv **\n",
  61                        CONFIG_ENV_FAT_INTERFACE, dev, part);
  62                 return 1;
  63         }
  64
  65         err = file_fat_write(CONFIG_ENV_FAT_FILE, (void *)&env_new, 0, sizeof(env_t),
  66                              &size);
  67         if (err == -1) {
  68                 printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
  69                         CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
  70                 return 1;
  71         }
  72
  73         puts("done\n");
  74         return 0;
  75 }
  76 #endif /* CMD_SAVEENV */
  77
  78 #ifdef LOADENV
  79 static void env_fat_load(void)
  80 {
  81         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
  82         struct blk_desc *dev_desc = NULL;
  83         disk_partition_t info;
  84         int dev, part;
  85         int err;
  86
  87         part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
  88                                         CONFIG_ENV_FAT_DEVICE_AND_PART,
  89                                         &dev_desc, &info, 1);
  90         if (part < 0)
  91                 goto err_env_relocate;
  92
  93         dev = dev_desc->devnum;
  94         if (fat_set_blk_dev(dev_desc, &info) != 0) {
  95                 printf("\n** Unable to use %s %d:%d for loading the env **\n",
  96                        CONFIG_ENV_FAT_INTERFACE, dev, part);
  97                 goto err_env_relocate;
  98         }
  99
 100         err = file_fat_read(CONFIG_ENV_FAT_FILE, buf, CONFIG_ENV_SIZE);
 101         if (err == -1) {
 102                 printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
 103                         CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
 104                 goto err_env_relocate;
 105         }
 106
 107         env_import(buf, 1);
 108         return;
 109
 110 err_env_relocate:
 111         set_default_env(NULL);
 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 };