env/ext4.c

   1 /*
   2  * (c) Copyright 2016 by VRT Technology
   3  *
   4  * Author:
   5  *  Stuart Longland <stuartl@vrt.com.au>
   6  *
   7  * Based on FAT environment driver
   8  * (c) Copyright 2011 by Tigris Elektronik GmbH
   9  *
  10  * Author:
  11  *  Maximilian Schwerin <mvs@tigris.de>
  12  *
  13  * and EXT4 filesystem implementation
  14  * (C) Copyright 2011 - 2012 Samsung Electronics
  15  * EXT4 filesystem implementation in Uboot by
  16  * Uma Shankar <uma.shankar@samsung.com>
  17  * Manjunatha C Achar <a.manjunatha@samsung.com>
  18  *
  19  * SPDX-License-Identifier:     GPL-2.0+
  20  */
  21
  22 #include <common.h>
  23
  24 #include <command.h>
  25 #include <environment.h>
  26 #include <linux/stddef.h>
  27 #include <malloc.h>
  28 #include <memalign.h>
  29 #include <search.h>
  30 #include <errno.h>
  31 #include <ext4fs.h>
  32 #include <mmc.h>
  33
  34 #ifdef CONFIG_CMD_SAVEENV
  35 static int env_ext4_save(void)
  36 {
  37         env_t   env_new;
  38         struct blk_desc *dev_desc = NULL;
  39         disk_partition_t info;
  40         int dev, part;
  41         int err;
  42
  43         err = env_export(&env_new);
  44         if (err)
  45                 return err;
  46
  47         part = blk_get_device_part_str(CONFIG_ENV_EXT4_INTERFACE,
  48                                        CONFIG_ENV_EXT4_DEVICE_AND_PART,
  49                                        &dev_desc, &info, 1);
  50         if (part < 0)
  51                 return 1;
  52
  53         dev = dev_desc->devnum;
  54         ext4fs_set_blk_dev(dev_desc, &info);
  55
  56         if (!ext4fs_mount(info.size)) {
  57                 printf("\n** Unable to use %s %s for saveenv **\n",
  58                        CONFIG_ENV_EXT4_INTERFACE,
  59                        CONFIG_ENV_EXT4_DEVICE_AND_PART);
  60                 return 1;
  61         }
  62
  63         err = ext4fs_write(CONFIG_ENV_EXT4_FILE, (void *)&env_new,
  64                            sizeof(env_t));
  65         ext4fs_close();
  66
  67         if (err == -1) {
  68                 printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
  69                         CONFIG_ENV_EXT4_FILE, CONFIG_ENV_EXT4_INTERFACE, dev,
  70                         part);
  71                 return 1;
  72         }
  73
  74         puts("done\n");
  75         return 0;
  76 }
  77 #endif /* CONFIG_CMD_SAVEENV */
  78
  79 static int env_ext4_load(void)
  80 {
  81         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
  82         struct blk_desc *dev_desc = NULL;
  83         disk_partition_t info;
  84         int dev, part;
  85         int err;
  86         loff_t off;
  87
  88 #ifdef CONFIG_MMC
  89         if (!strcmp(CONFIG_ENV_EXT4_INTERFACE, "mmc"))
  90                 mmc_initialize(NULL);
  91 #endif
  92
  93         part = blk_get_device_part_str(CONFIG_ENV_EXT4_INTERFACE,
  94                                        CONFIG_ENV_EXT4_DEVICE_AND_PART,
  95                                        &dev_desc, &info, 1);
  96         if (part < 0)
  97                 goto err_env_relocate;
  98
  99         dev = dev_desc->devnum;
 100         ext4fs_set_blk_dev(dev_desc, &info);
 101
 102         if (!ext4fs_mount(info.size)) {
 103                 printf("\n** Unable to use %s %s for loading the env **\n",
 104                        CONFIG_ENV_EXT4_INTERFACE,
 105                        CONFIG_ENV_EXT4_DEVICE_AND_PART);
 106                 goto err_env_relocate;
 107         }
 108
 109         err = ext4_read_file(CONFIG_ENV_EXT4_FILE, buf, 0, CONFIG_ENV_SIZE,
 110                              &off);
 111         ext4fs_close();
 112
 113         if (err == -1) {
 114                 printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
 115                         CONFIG_ENV_EXT4_FILE, CONFIG_ENV_EXT4_INTERFACE, dev,
 116                         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
 128 U_BOOT_ENV_LOCATION(ext4) = {
 129         .location       = ENVL_EXT4,
 130         ENV_NAME("EXT4")
 131         .load           = env_ext4_load,
 132         .save           = env_save_ptr(env_ext4_save),
 133 };