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 static int env_fat_init(void)
  41 {
  42         /* use default */
  43         gd->env_addr = (ulong)&default_environment[0];
  44         gd->env_valid = ENV_VALID;
  45
  46         return 0;
  47 }
  48
  49 #ifdef CMD_SAVEENV
  50 static int env_fat_save(void)
  51 {
  52         env_t   env_new;
  53         struct blk_desc *dev_desc = NULL;
  54         disk_partition_t info;
  55         int dev, part;
  56         int err;
  57         loff_t size;
  58
  59         err = env_export(&env_new);
  60         if (err)
  61                 return err;
  62
  63         part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
  64                                         CONFIG_ENV_FAT_DEVICE_AND_PART,
  65                                         &dev_desc, &info, 1);
  66         if (part < 0)
  67                 return 1;
  68
  69         dev = dev_desc->devnum;
  70         if (fat_set_blk_dev(dev_desc, &info) != 0) {
  71                 printf("\n** Unable to use %s %d:%d for saveenv **\n",
  72                        CONFIG_ENV_FAT_INTERFACE, dev, part);
  73                 return 1;
  74         }
  75
  76         err = file_fat_write(CONFIG_ENV_FAT_FILE, (void *)&env_new, 0, sizeof(env_t),
  77                              &size);
  78         if (err == -1) {
  79                 printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
  80                         CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
  81                 return 1;
  82         }
  83
  84         puts("done\n");
  85         return 0;
  86 }
  87 #endif /* CMD_SAVEENV */
  88
  89 #ifdef LOADENV
  90 static void env_fat_load(void)
  91 {
  92         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
  93         struct blk_desc *dev_desc = NULL;
  94         disk_partition_t info;
  95         int dev, part;
  96         int err;
  97
  98         part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
  99                                         CONFIG_ENV_FAT_DEVICE_AND_PART,
 100                                         &dev_desc, &info, 1);
 101         if (part < 0)
 102                 goto err_env_relocate;
 103
 104         dev = dev_desc->devnum;
 105         if (fat_set_blk_dev(dev_desc, &info) != 0) {
 106                 printf("\n** Unable to use %s %d:%d for loading the env **\n",
 107                        CONFIG_ENV_FAT_INTERFACE, dev, part);
 108                 goto err_env_relocate;
 109         }
 110
 111         err = file_fat_read(CONFIG_ENV_FAT_FILE, buf, CONFIG_ENV_SIZE);
 112         if (err == -1) {
 113                 printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
 114                         CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
 115                 goto err_env_relocate;
 116         }
 117
 118         env_import(buf, 1);
 119         return;
 120
 121 err_env_relocate:
 122         set_default_env(NULL);
 123 }
 124 #endif /* LOADENV */
 125
 126 U_BOOT_ENV_LOCATION(fat) = {
 127         .location       = ENVL_FAT,
 128 #ifdef LOADENV
 129         .load           = env_fat_load,
 130 #endif
 131 #ifdef CMD_SAVEENV
 132         .save           = env_save_ptr(env_fat_save),
 133 #endif
 134         .init           = env_fat_init,
 135 };