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 <scsi.h>
  35 #include <asm/global_data.h>
  36
  37 DECLARE_GLOBAL_DATA_PTR;
  38
  39 __weak const char *env_ext4_get_intf(void)
  40 {
  41         return (const char *)CONFIG_ENV_EXT4_INTERFACE;
  42 }
  43
  44 __weak const char *env_ext4_get_dev_part(void)
  45 {
  46 #ifdef CONFIG_MMC
  47         static char *part_str;
  48
  49         if (!part_str) {
  50                 part_str = CONFIG_ENV_EXT4_DEVICE_AND_PART;
  51                 if (!strcmp(CONFIG_ENV_EXT4_INTERFACE, "mmc") && part_str[0] == ':') {
  52                         part_str = "0" CONFIG_ENV_EXT4_DEVICE_AND_PART;
  53                         part_str[0] += mmc_get_env_dev();
  54                 }
  55         }
  56
  57         return part_str;
  58 #else
  59         return (const char *)CONFIG_ENV_EXT4_DEVICE_AND_PART;
  60 #endif
  61 }
  62
  63 static int env_ext4_save_buffer(env_t *env_new)
  64 {
  65         struct blk_desc *dev_desc = NULL;
  66         struct disk_partition info;
  67         int dev, part;
  68         int err;
  69         const char *ifname = env_ext4_get_intf();
  70         const char *dev_and_part = env_ext4_get_dev_part();
  71
  72         part = blk_get_device_part_str(ifname, dev_and_part,
  73                                        &dev_desc, &info, 1);
  74         if (part < 0)
  75                 return 1;
  76
  77         dev = dev_desc->devnum;
  78         ext4fs_set_blk_dev(dev_desc, &info);
  79
  80         if (!ext4fs_mount(info.size)) {
  81                 printf("\n** Unable to use %s %s for saveenv **\n",
  82                        ifname, dev_and_part);
  83                 return 1;
  84         }
  85
  86         err = ext4fs_write(CONFIG_ENV_EXT4_FILE, (void *)env_new,
  87                            sizeof(env_t), FILETYPE_REG);
  88         ext4fs_close();
  89
  90         if (err == -1) {
  91                 printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
  92                         CONFIG_ENV_EXT4_FILE, ifname, dev, part);
  93                 return 1;
  94         }
  95
  96         return 0;
  97 }
  98
  99 static int env_ext4_save(void)
 100 {
 101         env_t env_new;
 102         int err;
 103
 104         err = env_export(&env_new);
 105         if (err)
 106                 return err;
 107
 108         err = env_ext4_save_buffer(&env_new);
 109         if (err)
 110                 return err;
 111
 112         gd->env_valid = ENV_VALID;
 113         puts("done\n");
 114
 115         return 0;
 116 }
 117
 118 static int env_ext4_erase(void)
 119 {
 120         env_t env_new;
 121         int err;
 122
 123         memset(&env_new, 0, sizeof(env_t));
 124
 125         err = env_ext4_save_buffer(&env_new);
 126         if (err)
 127                 return err;
 128
 129         gd->env_valid = ENV_INVALID;
 130         puts("done\n");
 131
 132         return 0;
 133 }
 134
 135 static int env_ext4_load(void)
 136 {
 137         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
 138         struct blk_desc *dev_desc = NULL;
 139         struct disk_partition info;
 140         int dev, part;
 141         int err;
 142         loff_t off;
 143         const char *ifname = env_ext4_get_intf();
 144         const char *dev_and_part = env_ext4_get_dev_part();
 145
 146 #ifdef CONFIG_MMC
 147         if (!strcmp(ifname, "mmc"))
 148                 mmc_initialize(NULL);
 149 #endif
 150 #if defined(CONFIG_AHCI) || defined(CONFIG_SCSI)
 151         if (!strcmp(ifname, "scsi"))
 152                 scsi_scan(true);
 153 #endif
 154
 155         part = blk_get_device_part_str(ifname, dev_and_part,
 156                                        &dev_desc, &info, 1);
 157         if (part < 0)
 158                 goto err_env_relocate;
 159
 160         dev = dev_desc->devnum;
 161         ext4fs_set_blk_dev(dev_desc, &info);
 162
 163         if (!ext4fs_mount(info.size)) {
 164                 printf("\n** Unable to use %s %s for loading the env **\n",
 165                        ifname, dev_and_part);
 166                 goto err_env_relocate;
 167         }
 168
 169         err = ext4_read_file(CONFIG_ENV_EXT4_FILE, buf, 0, CONFIG_ENV_SIZE,
 170                              &off);
 171         ext4fs_close();
 172
 173         if (err == -1) {
 174                 printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
 175                         CONFIG_ENV_EXT4_FILE, ifname, dev, part);
 176                 goto err_env_relocate;
 177         }
 178
 179         err = env_import(buf, 1, H_EXTERNAL);
 180         if (!err)
 181                 gd->env_valid = ENV_VALID;
 182
 183         return err;
 184
 185 err_env_relocate:
 186         env_set_default(NULL, 0);
 187
 188         return -EIO;
 189 }
 190
 191 U_BOOT_ENV_LOCATION(ext4) = {
 192         .location       = ENVL_EXT4,
 193         ENV_NAME("EXT4")
 194         .load           = env_ext4_load,
 195         .save           = ENV_SAVE_PTR(env_ext4_save),
 196         .erase          = ENV_ERASE_PTR(env_ext4_erase),
 197 };