env/ext4.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (c) Copyright 2016 by VRT Technology
   4  *
   5  * Author:
   6  *  Stuart Longland <stuartl@vrt.com.au>
   7  *
   8  * Based on FAT environment driver
   9  * (c) Copyright 2011 by Tigris Elektronik GmbH
  10  *
  11  * Author:
  12  *  Maximilian Schwerin <mvs@tigris.de>
  13  *
  14  * and EXT4 filesystem implementation
  15  * (C) Copyright 2011 - 2012 Samsung Electronics
  16  * EXT4 filesystem implementation in Uboot by
  17  * Uma Shankar <uma.shankar@samsung.com>
  18  * Manjunatha C Achar <a.manjunatha@samsung.com>
  19  */
  20
  21 #include <common.h>
  22
  23 #include <command.h>
  24 #include <environment.h>
  25 #include <linux/stddef.h>
  26 #include <malloc.h>
  27 #include <memalign.h>
  28 #include <search.h>
  29 #include <errno.h>
  30 #include <ext4fs.h>
  31 #include <mmc.h>
  32
  33 #ifdef CONFIG_CMD_SAVEENV
  34 static int env_ext4_save(void)
  35 {
  36         env_t   env_new;
  37         struct blk_desc *dev_desc = NULL;
  38         disk_partition_t info;
  39         int dev, part;
  40         int err;
  41
  42         err = env_export(&env_new);
  43         if (err)
  44                 return err;
  45
  46         part = blk_get_device_part_str(CONFIG_ENV_EXT4_INTERFACE,
  47                                        CONFIG_ENV_EXT4_DEVICE_AND_PART,
  48                                        &dev_desc, &info, 1);
  49         if (part < 0)
  50                 return 1;
  51
  52         dev = dev_desc->devnum;
  53         ext4fs_set_blk_dev(dev_desc, &info);
  54
  55         if (!ext4fs_mount(info.size)) {
  56                 printf("\n** Unable to use %s %s for saveenv **\n",
  57                        CONFIG_ENV_EXT4_INTERFACE,
  58                        CONFIG_ENV_EXT4_DEVICE_AND_PART);
  59                 return 1;
  60         }
  61
  62         err = ext4fs_write(CONFIG_ENV_EXT4_FILE, (void *)&env_new,
  63                            sizeof(env_t));
  64         ext4fs_close();
  65
  66         if (err == -1) {
  67                 printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
  68                         CONFIG_ENV_EXT4_FILE, CONFIG_ENV_EXT4_INTERFACE, dev,
  69                         part);
  70                 return 1;
  71         }
  72
  73         puts("done\n");
  74         return 0;
  75 }
  76 #endif /* CONFIG_CMD_SAVEENV */
  77
  78 static int env_ext4_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         loff_t off;
  86
  87 #ifdef CONFIG_MMC
  88         if (!strcmp(CONFIG_ENV_EXT4_INTERFACE, "mmc"))
  89                 mmc_initialize(NULL);
  90 #endif
  91
  92         part = blk_get_device_part_str(CONFIG_ENV_EXT4_INTERFACE,
  93                                        CONFIG_ENV_EXT4_DEVICE_AND_PART,
  94                                        &dev_desc, &info, 1);
  95         if (part < 0)
  96                 goto err_env_relocate;
  97
  98         dev = dev_desc->devnum;
  99         ext4fs_set_blk_dev(dev_desc, &info);
 100
 101         if (!ext4fs_mount(info.size)) {
 102                 printf("\n** Unable to use %s %s for loading the env **\n",
 103                        CONFIG_ENV_EXT4_INTERFACE,
 104                        CONFIG_ENV_EXT4_DEVICE_AND_PART);
 105                 goto err_env_relocate;
 106         }
 107
 108         err = ext4_read_file(CONFIG_ENV_EXT4_FILE, buf, 0, CONFIG_ENV_SIZE,
 109                              &off);
 110         ext4fs_close();
 111
 112         if (err == -1) {
 113                 printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
 114                         CONFIG_ENV_EXT4_FILE, CONFIG_ENV_EXT4_INTERFACE, dev,
 115                         part);
 116                 goto err_env_relocate;
 117         }
 118
 119         return env_import(buf, 1);
 120
 121 err_env_relocate:
 122         set_default_env(NULL, 0);
 123
 124         return -EIO;
 125 }
 126
 127 U_BOOT_ENV_LOCATION(ext4) = {
 128         .location       = ENVL_EXT4,
 129         ENV_NAME("EXT4")
 130         .load           = env_ext4_load,
 131         .save           = env_save_ptr(env_ext4_save),
 132 };