env/fat.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (c) Copyright 2011 by Tigris Elektronik GmbH
   4  *
   5  * Author:
   6  *  Maximilian Schwerin <mvs@tigris.de>
   7  */
   8
   9 #include <common.h>
  10
  11 #include <command.h>
  12 #include <environment.h>
  13 #include <linux/stddef.h>
  14 #include <malloc.h>
  15 #include <memalign.h>
  16 #include <search.h>
  17 #include <errno.h>
  18 #include <fat.h>
  19 #include <mmc.h>
  20
  21 #ifdef CONFIG_SPL_BUILD
  22 /* TODO(sjg@chromium.org): Figure out why this is needed */
  23 # if !defined(CONFIG_TARGET_AM335X_EVM) || defined(CONFIG_SPL_OS_BOOT)
  24 #  define LOADENV
  25 # endif
  26 #else
  27 # define LOADENV
  28 # if defined(CONFIG_CMD_SAVEENV)
  29 #  define CMD_SAVEENV
  30 # endif
  31 #endif
  32
  33 #ifdef CMD_SAVEENV
  34 static int env_fat_save(void)
  35 {
  36         env_t __aligned(ARCH_DMA_MINALIGN) env_new;
  37         struct blk_desc *dev_desc = NULL;
  38         disk_partition_t info;
  39         int dev, part;
  40         int err;
  41         loff_t size;
  42
  43         err = env_export(&env_new);
  44         if (err)
  45                 return err;
  46
  47         part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
  48                                         CONFIG_ENV_FAT_DEVICE_AND_PART,
  49                                         &dev_desc, &info, 1);
  50         if (part < 0)
  51                 return 1;
  52
  53         dev = dev_desc->devnum;
  54         if (fat_set_blk_dev(dev_desc, &info) != 0) {
  55                 /*
  56                  * This printf is embedded in the messages from env_save that
  57                  * will calling it. The missing \n is intentional.
  58                  */
  59                 printf("Unable to use %s %d:%d... ",
  60                        CONFIG_ENV_FAT_INTERFACE, dev, part);
  61                 return 1;
  62         }
  63
  64         err = file_fat_write(CONFIG_ENV_FAT_FILE, (void *)&env_new, 0, sizeof(env_t),
  65                              &size);
  66         if (err == -1) {
  67                 /*
  68                  * This printf is embedded in the messages from env_save that
  69                  * will calling it. The missing \n is intentional.
  70                  */
  71                 printf("Unable to write \"%s\" from %s%d:%d... ",
  72                         CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
  73                 return 1;
  74         }
  75
  76         return 0;
  77 }
  78 #endif /* CMD_SAVEENV */
  79
  80 #ifdef LOADENV
  81 static int 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 #ifdef CONFIG_MMC
  90         if (!strcmp(CONFIG_ENV_FAT_INTERFACE, "mmc"))
  91                 mmc_initialize(NULL);
  92 #endif
  93
  94         part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
  95                                         CONFIG_ENV_FAT_DEVICE_AND_PART,
  96                                         &dev_desc, &info, 1);
  97         if (part < 0)
  98                 goto err_env_relocate;
  99
 100         dev = dev_desc->devnum;
 101         if (fat_set_blk_dev(dev_desc, &info) != 0) {
 102                 /*
 103                  * This printf is embedded in the messages from env_save that
 104                  * will calling it. The missing \n is intentional.
 105                  */
 106                 printf("Unable to use %s %d:%d... ",
 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                 /*
 114                  * This printf is embedded in the messages from env_save that
 115                  * will calling it. The missing \n is intentional.
 116                  */
 117                 printf("Unable to read \"%s\" from %s%d:%d... ",
 118                         CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
 119                 goto err_env_relocate;
 120         }
 121
 122         return env_import(buf, 1);
 123
 124 err_env_relocate:
 125         set_default_env(NULL, 0);
 126
 127         return -EIO;
 128 }
 129 #endif /* LOADENV */
 130
 131 U_BOOT_ENV_LOCATION(fat) = {
 132         .location       = ENVL_FAT,
 133         ENV_NAME("FAT")
 134 #ifdef LOADENV
 135         .load           = env_fat_load,
 136 #endif
 137 #ifdef CMD_SAVEENV
 138         .save           = env_save_ptr(env_fat_save),
 139 #endif
 140 };