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 #include <part.h>
  23
  24 #include <command.h>
  25 #include <env.h>
  26 #include <env_internal.h>
  27 #include <linux/stddef.h>
  28 #include <malloc.h>
  29 #include <memalign.h>
  30 #include <search.h>
  31 #include <errno.h>
  32 #include <ext4fs.h>
  33 #include <mmc.h>
  34 #include <asm/global_data.h>
  35
  36 DECLARE_GLOBAL_DATA_PTR;
  37
  38 __weak const char *env_ext4_get_intf(void)
  39 {
  40         return (const char *)CONFIG_ENV_EXT4_INTERFACE;
  41 }
  42
  43 __weak const char *env_ext4_get_dev_part(void)
  44 {
  45 #ifdef CONFIG_MMC
  46         static char *part_str;
  47
  48         if (!part_str) {
  49                 part_str = CONFIG_ENV_EXT4_DEVICE_AND_PART;
  50                 if (!strcmp(CONFIG_ENV_EXT4_INTERFACE, "mmc") && part_str[0] == ':') {
  51                         part_str = "0" CONFIG_ENV_EXT4_DEVICE_AND_PART;
  52                         part_str[0] += mmc_get_env_dev();
  53                 }
  54         }
  55
  56         return part_str;
  57 #else
  58         return (const char *)CONFIG_ENV_EXT4_DEVICE_AND_PART;
  59 #endif
  60 }
  61
  62 static int env_ext4_save_buffer(env_t *env_new)
  63 {
  64         struct blk_desc *dev_desc = NULL;
  65         struct disk_partition info;
  66         int dev, part;
  67         int err;
  68         const char *ifname = env_ext4_get_intf();
  69         const char *dev_and_part = env_ext4_get_dev_part();
  70
  71         part = blk_get_device_part_str(ifname, dev_and_part,
  72                                        &dev_desc, &info, 1);
  73         if (part < 0)
  74                 return 1;
  75
  76         dev = dev_desc->devnum;
  77         ext4fs_set_blk_dev(dev_desc, &info);
  78
  79         if (!ext4fs_mount(info.size)) {
  80                 printf("\n** Unable to use %s %s for saveenv **\n",
  81                        ifname, dev_and_part);
  82                 return 1;
  83         }
  84
  85         err = ext4fs_write(CONFIG_ENV_EXT4_FILE, (void *)env_new,
  86                            sizeof(env_t), FILETYPE_REG);
  87         ext4fs_close();
  88
  89         if (err == -1) {
  90                 printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
  91                         CONFIG_ENV_EXT4_FILE, ifname, dev, part);
  92                 return 1;
  93         }
  94
  95         return 0;
  96 }
  97
  98 static int env_ext4_save(void)
  99 {
 100         env_t env_new;
 101         int err;
 102
 103         err = env_export(&env_new);
 104         if (err)
 105                 return err;
 106
 107         err = env_ext4_save_buffer(&env_new);
 108         if (err)
 109                 return err;
 110
 111         gd->env_valid = ENV_VALID;
 112         puts("done\n");
 113
 114         return 0;
 115 }
 116
 117 static int env_ext4_erase(void)
 118 {
 119         env_t env_new;
 120         int err;
 121
 122         memset(&env_new, 0, sizeof(env_t));
 123
 124         err = env_ext4_save_buffer(&env_new);
 125         if (err)
 126                 return err;
 127
 128         gd->env_valid = ENV_INVALID;
 129         puts("done\n");
 130
 131         return 0;
 132 }
 133
 134 static int env_ext4_load(void)
 135 {
 136         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
 137         struct blk_desc *dev_desc = NULL;
 138         struct disk_partition info;
 139         int dev, part;
 140         int err;
 141         loff_t off;
 142         const char *ifname = env_ext4_get_intf();
 143         const char *dev_and_part = env_ext4_get_dev_part();
 144
 145 #ifdef CONFIG_MMC
 146         if (!strcmp(ifname, "mmc"))
 147                 mmc_initialize(NULL);
 148 #endif
 149
 150         part = blk_get_device_part_str(ifname, dev_and_part,
 151                                        &dev_desc, &info, 1);
 152         if (part < 0)
 153                 goto err_env_relocate;
 154
 155         dev = dev_desc->devnum;
 156         ext4fs_set_blk_dev(dev_desc, &info);
 157
 158         if (!ext4fs_mount(info.size)) {
 159                 printf("\n** Unable to use %s %s for loading the env **\n",
 160                        ifname, dev_and_part);
 161                 goto err_env_relocate;
 162         }
 163
 164         err = ext4_read_file(CONFIG_ENV_EXT4_FILE, buf, 0, CONFIG_ENV_SIZE,
 165                              &off);
 166         ext4fs_close();
 167
 168         if (err == -1) {
 169                 printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
 170                         CONFIG_ENV_EXT4_FILE, ifname, dev, part);
 171                 goto err_env_relocate;
 172         }
 173
 174         err = env_import(buf, 1, H_EXTERNAL);
 175         if (!err)
 176                 gd->env_valid = ENV_VALID;
 177
 178         return err;
 179
 180 err_env_relocate:
 181         env_set_default(NULL, 0);
 182
 183         return -EIO;
 184 }
 185
 186 U_BOOT_ENV_LOCATION(ext4) = {
 187         .location       = ENVL_EXT4,
 188         ENV_NAME("EXT4")
 189         .load           = env_ext4_load,
 190         .save           = ENV_SAVE_PTR(env_ext4_save),
 191         .erase          = ENV_ERASE_PTR(env_ext4_erase),
 192 };