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 #include <asm/cache.h>
  11
  12 #include <command.h>
  13 #include <env.h>
  14 #include <env_internal.h>
  15 #include <linux/stddef.h>
  16 #include <malloc.h>
  17 #include <memalign.h>
  18 #include <search.h>
  19 #include <errno.h>
  20 #include <fat.h>
  21 #include <mmc.h>
  22
  23 #ifdef CONFIG_SPL_BUILD
  24 /* TODO(sjg@chromium.org): Figure out why this is needed */
  25 # if !defined(CONFIG_TARGET_AM335X_EVM) || defined(CONFIG_SPL_OS_BOOT)
  26 #  define LOADENV
  27 # endif
  28 #else
  29 # define LOADENV
  30 #endif
  31
  32 static int env_fat_save(void)
  33 {
  34         env_t __aligned(ARCH_DMA_MINALIGN) env_new;
  35         struct blk_desc *dev_desc = NULL;
  36         disk_partition_t info;
  37         int dev, part;
  38         int err;
  39         loff_t size;
  40
  41         err = env_export(&env_new);
  42         if (err)
  43                 return err;
  44
  45         part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
  46                                         CONFIG_ENV_FAT_DEVICE_AND_PART,
  47                                         &dev_desc, &info, 1);
  48         if (part < 0)
  49                 return 1;
  50
  51         dev = dev_desc->devnum;
  52         if (fat_set_blk_dev(dev_desc, &info) != 0) {
  53                 /*
  54                  * This printf is embedded in the messages from env_save that
  55                  * will calling it. The missing \n is intentional.
  56                  */
  57                 printf("Unable to use %s %d:%d... ",
  58                        CONFIG_ENV_FAT_INTERFACE, dev, part);
  59                 return 1;
  60         }
  61
  62         err = file_fat_write(CONFIG_ENV_FAT_FILE, (void *)&env_new, 0, sizeof(env_t),
  63                              &size);
  64         if (err == -1) {
  65                 /*
  66                  * This printf is embedded in the messages from env_save that
  67                  * will calling it. The missing \n is intentional.
  68                  */
  69                 printf("Unable to write \"%s\" from %s%d:%d... ",
  70                         CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
  71                 return 1;
  72         }
  73
  74         return 0;
  75 }
  76
  77 #ifdef LOADENV
  78 static int env_fat_load(void)
  79 {
  80         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
  81         struct blk_desc *dev_desc = NULL;
  82         disk_partition_t info;
  83         int dev, part;
  84         int err;
  85
  86 #ifdef CONFIG_MMC
  87         if (!strcmp(CONFIG_ENV_FAT_INTERFACE, "mmc"))
  88                 mmc_initialize(NULL);
  89 #endif
  90
  91         part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
  92                                         CONFIG_ENV_FAT_DEVICE_AND_PART,
  93                                         &dev_desc, &info, 1);
  94         if (part < 0)
  95                 goto err_env_relocate;
  96
  97         dev = dev_desc->devnum;
  98         if (fat_set_blk_dev(dev_desc, &info) != 0) {
  99                 /*
 100                  * This printf is embedded in the messages from env_save that
 101                  * will calling it. The missing \n is intentional.
 102                  */
 103                 printf("Unable to use %s %d:%d... ",
 104                        CONFIG_ENV_FAT_INTERFACE, dev, part);
 105                 goto err_env_relocate;
 106         }
 107
 108         err = file_fat_read(CONFIG_ENV_FAT_FILE, buf, CONFIG_ENV_SIZE);
 109         if (err == -1) {
 110                 /*
 111                  * This printf is embedded in the messages from env_save that
 112                  * will calling it. The missing \n is intentional.
 113                  */
 114                 printf("Unable to read \"%s\" from %s%d:%d... ",
 115                         CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
 116                 goto err_env_relocate;
 117         }
 118
 119         return env_import(buf, 1);
 120
 121 err_env_relocate:
 122         env_set_default(NULL, 0);
 123
 124         return -EIO;
 125 }
 126 #endif /* LOADENV */
 127
 128 U_BOOT_ENV_LOCATION(fat) = {
 129         .location       = ENVL_FAT,
 130         ENV_NAME("FAT")
 131 #ifdef LOADENV
 132         .load           = env_fat_load,
 133 #endif
 134         .save           = ENV_SAVE_PTR(env_fat_save),
 135 };