common/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 char *env_name_spec = "EXT4";
  35
  36 env_t *env_ptr;
  37
  38 DECLARE_GLOBAL_DATA_PTR;
  39
  40 int env_init(void)
  41 {
  42         /* use default */
  43         gd->env_addr = (ulong)&default_environment[0];
  44         gd->env_valid = 1;
  45
  46         return 0;
  47 }
  48
  49 #ifdef CONFIG_CMD_SAVEENV
  50 int saveenv(void)
  51 {
  52         env_t   env_new;
  53         struct blk_desc *dev_desc = NULL;
  54         disk_partition_t info;
  55         int dev, part;
  56         int err;
  57
  58         err = env_export(&env_new);
  59         if (err)
  60                 return err;
  61
  62         part = blk_get_device_part_str(EXT4_ENV_INTERFACE,
  63                                         EXT4_ENV_DEVICE_AND_PART,
  64                                         &dev_desc, &info, 1);
  65         if (part < 0)
  66                 return 1;
  67
  68         dev = dev_desc->devnum;
  69         ext4fs_set_blk_dev(dev_desc, &info);
  70
  71         if (!ext4fs_mount(info.size)) {
  72                 printf("\n** Unable to use %s %s for saveenv **\n",
  73                        EXT4_ENV_INTERFACE, EXT4_ENV_DEVICE_AND_PART);
  74                 return 1;
  75         }
  76
  77         err = ext4fs_write(EXT4_ENV_FILE, (void *)&env_new, sizeof(env_t));
  78         ext4fs_close();
  79
  80         if (err == -1) {
  81                 printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
  82                         EXT4_ENV_FILE, EXT4_ENV_INTERFACE, dev, part);
  83                 return 1;
  84         }
  85
  86         puts("done\n");
  87         return 0;
  88 }
  89 #endif /* CONFIG_CMD_SAVEENV */
  90
  91 void env_relocate_spec(void)
  92 {
  93         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
  94         struct blk_desc *dev_desc = NULL;
  95         disk_partition_t info;
  96         int dev, part;
  97         int err;
  98         loff_t off;
  99
 100         part = blk_get_device_part_str(EXT4_ENV_INTERFACE,
 101                                         EXT4_ENV_DEVICE_AND_PART,
 102                                         &dev_desc, &info, 1);
 103         if (part < 0)
 104                 goto err_env_relocate;
 105
 106         dev = dev_desc->devnum;
 107         ext4fs_set_blk_dev(dev_desc, &info);
 108
 109         if (!ext4fs_mount(info.size)) {
 110                 printf("\n** Unable to use %s %s for loading the env **\n",
 111                        EXT4_ENV_INTERFACE, EXT4_ENV_DEVICE_AND_PART);
 112                 goto err_env_relocate;
 113         }
 114
 115         err = ext4_read_file(EXT4_ENV_FILE, buf, 0, CONFIG_ENV_SIZE, &off);
 116         ext4fs_close();
 117
 118         if (err == -1) {
 119                 printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
 120                         EXT4_ENV_FILE, EXT4_ENV_INTERFACE, dev, part);
 121                 goto err_env_relocate;
 122         }
 123
 124         env_import(buf, 1);
 125         return;
 126
 127 err_env_relocate:
 128         set_default_env(NULL);
 129 }