LXR uboot/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
  36DECLARE_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
  62static 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
  98static 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
 117static 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
 134static 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
 180err_env_relocate:
 181        env_set_default(NULL, 0);
 182
 183        return -EIO;
 184}
 185
 186U_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};
 193