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 <env.h>
  13 #include <env_internal.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 #endif
  30
  31 static int env_fat_save(void)
  32 {
  33         env_t __aligned(ARCH_DMA_MINALIGN) env_new;
  34         struct blk_desc *dev_desc = NULL;
  35         disk_partition_t info;
  36         int dev, part;
  37         int err;
  38         loff_t size;
  39
  40         err = env_export(&env_new);
  41         if (err)
  42                 return err;
  43
  44         part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
  45                                         CONFIG_ENV_FAT_DEVICE_AND_PART,
  46                                         &dev_desc, &info, 1);
  47         if (part < 0)
  48                 return 1;
  49
  50         dev = dev_desc->devnum;
  51         if (fat_set_blk_dev(dev_desc, &info) != 0) {
  52                 /*
  53                  * This printf is embedded in the messages from env_save that
  54                  * will calling it. The missing \n is intentional.
  55                  */
  56                 printf("Unable to use %s %d:%d... ",
  57                        CONFIG_ENV_FAT_INTERFACE, dev, part);
  58                 return 1;
  59         }
  60
  61         err = file_fat_write(CONFIG_ENV_FAT_FILE, (void *)&env_new, 0, sizeof(env_t),
  62                              &size);
  63         if (err == -1) {
  64                 /*
  65                  * This printf is embedded in the messages from env_save that
  66                  * will calling it. The missing \n is intentional.
  67                  */
  68                 printf("Unable to write \"%s\" from %s%d:%d... ",
  69                         CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
  70                 return 1;
  71         }
  72
  73         return 0;
  74 }
  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 #ifdef CONFIG_MMC
  86         if (!strcmp(CONFIG_ENV_FAT_INTERFACE, "mmc"))
  87                 mmc_initialize(NULL);
  88 #endif
  89
  90         part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
  91                                         CONFIG_ENV_FAT_DEVICE_AND_PART,
  92                                         &dev_desc, &info, 1);
  93         if (part < 0)
  94                 goto err_env_relocate;
  95
  96         dev = dev_desc->devnum;
  97         if (fat_set_blk_dev(dev_desc, &info) != 0) {
  98                 /*
  99                  * This printf is embedded in the messages from env_save that
 100                  * will calling it. The missing \n is intentional.
 101                  */
 102                 printf("Unable to use %s %d:%d... ",
 103                        CONFIG_ENV_FAT_INTERFACE, dev, part);
 104                 goto err_env_relocate;
 105         }
 106
 107         err = file_fat_read(CONFIG_ENV_FAT_FILE, buf, CONFIG_ENV_SIZE);
 108         if (err == -1) {
 109                 /*
 110                  * This printf is embedded in the messages from env_save that
 111                  * will calling it. The missing \n is intentional.
 112                  */
 113                 printf("Unable to read \"%s\" from %s%d:%d... ",
 114                         CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
 115                 goto err_env_relocate;
 116         }
 117
 118         return env_import(buf, 1);
 119
 120 err_env_relocate:
 121         env_set_default(NULL, 0);
 122
 123         return -EIO;
 124 }
 125 #endif /* LOADENV */
 126
 127 U_BOOT_ENV_LOCATION(fat) = {
 128         .location       = ENVL_FAT,
 129         ENV_NAME("FAT")
 130 #ifdef LOADENV
 131         .load           = env_fat_load,
 132 #endif
 133         .save           = ENV_SAVE_PTR(env_fat_save),
 134 };