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                 /*
  59                  * This printf is embedded in the messages from env_save that
  60                  * will calling it. The missing \n is intentional.
  61                  */
  62                 printf("Unable to use %s %d:%d... ",
  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                 /*
  71                  * This printf is embedded in the messages from env_save that
  72                  * will calling it. The missing \n is intentional.
  73                  */
  74                 printf("Unable to write \"%s\" from %s%d:%d... ",
  75                         CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
  76                 return 1;
  77         }
  78
  79         return 0;
  80 }
  81 #endif /* CMD_SAVEENV */
  82
  83 #ifdef LOADENV
  84 static int env_fat_load(void)
  85 {
  86         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
  87         struct blk_desc *dev_desc = NULL;
  88         disk_partition_t info;
  89         int dev, part;
  90         int err;
  91
  92         part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
  93                                         CONFIG_ENV_FAT_DEVICE_AND_PART,
  94                                         &dev_desc, &info, 1);
  95         if (part < 0)
  96                 goto err_env_relocate;
  97
  98         dev = dev_desc->devnum;
  99         if (fat_set_blk_dev(dev_desc, &info) != 0) {
 100                 /*
 101                  * This printf is embedded in the messages from env_save that
 102                  * will calling it. The missing \n is intentional.
 103                  */
 104                 printf("Unable to use %s %d:%d... ",
 105                        CONFIG_ENV_FAT_INTERFACE, dev, part);
 106                 goto err_env_relocate;
 107         }
 108
 109         err = file_fat_read(CONFIG_ENV_FAT_FILE, buf, CONFIG_ENV_SIZE);
 110         if (err == -1) {
 111                 /*
 112                  * This printf is embedded in the messages from env_save that
 113                  * will calling it. The missing \n is intentional.
 114                  */
 115                 printf("Unable to read \"%s\" from %s%d:%d... ",
 116                         CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
 117                 goto err_env_relocate;
 118         }
 119
 120         return env_import(buf, 1);
 121
 122 err_env_relocate:
 123         set_default_env(NULL);
 124
 125         return -EIO;
 126 }
 127 #endif /* LOADENV */
 128
 129 U_BOOT_ENV_LOCATION(fat) = {
 130         .location       = ENVL_FAT,
 131         ENV_NAME("FAT")
 132 #ifdef LOADENV
 133         .load           = env_fat_load,
 134 #endif
 135 #ifdef CMD_SAVEENV
 136         .save           = env_save_ptr(env_fat_save),
 137 #endif
 138 };