/*
   * (c) Copyright 2016 by VRT Technology
   *
   * Author:
   *  Stuart Longland <stuartl@vrt.com.au>
   *
   * Based on FAT environment driver
   * (c) Copyright 2011 by Tigris Elektronik GmbH
   *
   * Author:
   *  Maximilian Schwerin <mvs@tigris.de>
   *
   * and EXT4 filesystem implementation
   * (C) Copyright 2011 - 2012 Samsung Electronics
   * EXT4 filesystem implementation in Uboot by
   * Uma Shankar <uma.shankar@samsung.com>
   * Manjunatha C Achar <a.manjunatha@samsung.com>
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  #include <common.h>
  
  #include <command.h>
  #include <environment.h>
  #include <linux/stddef.h>
  #include <malloc.h>

  #include <memalign.h>

  #include <search.h>
  #include <errno.h>
  #include <ext4fs.h>
  #include <mmc.h>

  DECLARE_GLOBAL_DATA_PTR;

  #ifdef CONFIG_CMD_SAVEENV

  static int env_ext4_save(void)

  {
  	env_t	env_new;

  	struct blk_desc *dev_desc = NULL;

  	disk_partition_t info;
  	int dev, part;
  	int err;
  
  	err = env_export(&env_new);
  	if (err)
  		return err;

  	part = blk_get_device_part_str(CONFIG_ENV_EXT4_INTERFACE,
  				       CONFIG_ENV_EXT4_DEVICE_AND_PART,
  				       &dev_desc, &info, 1);

  	if (part < 0)
  		return 1;

  	dev = dev_desc->devnum;

  	ext4fs_set_blk_dev(dev_desc, &info);
  
  	if (!ext4fs_mount(info.size)) {
  		printf("
  ** Unable to use %s %s for saveenv **
  ",

  		       CONFIG_ENV_EXT4_INTERFACE,
  		       CONFIG_ENV_EXT4_DEVICE_AND_PART);

  		return 1;
  	}

  	err = ext4fs_write(CONFIG_ENV_EXT4_FILE, (void *)&env_new,
  			   sizeof(env_t));

  	ext4fs_close();
  
  	if (err == -1) {
  		printf("
  ** Unable to write \"%s\" from %s%d:%d **
  ",

  			CONFIG_ENV_EXT4_FILE, CONFIG_ENV_EXT4_INTERFACE, dev,
  			part);

  		return 1;
  	}
  
  	puts("done
  ");
  	return 0;
  }
  #endif /* CONFIG_CMD_SAVEENV */

  static int env_ext4_load(void)

  {
  	ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);

  	struct blk_desc *dev_desc = NULL;

  	disk_partition_t info;
  	int dev, part;
  	int err;

  	loff_t off;

  	if (!strcmp(CONFIG_ENV_EXT4_INTERFACE, "mmc"))
  		mmc_initialize(NULL);

  	part = blk_get_device_part_str(CONFIG_ENV_EXT4_INTERFACE,
  				       CONFIG_ENV_EXT4_DEVICE_AND_PART,
  				       &dev_desc, &info, 1);

  	if (part < 0)
  		goto err_env_relocate;

  	dev = dev_desc->devnum;

  	ext4fs_set_blk_dev(dev_desc, &info);
  
  	if (!ext4fs_mount(info.size)) {
  		printf("
  ** Unable to use %s %s for loading the env **
  ",

  		       CONFIG_ENV_EXT4_INTERFACE,
  		       CONFIG_ENV_EXT4_DEVICE_AND_PART);

  		goto err_env_relocate;
  	}

  	err = ext4_read_file(CONFIG_ENV_EXT4_FILE, buf, 0, CONFIG_ENV_SIZE,
  			     &off);

  	ext4fs_close();
  
  	if (err == -1) {
  		printf("
  ** Unable to read \"%s\" from %s%d:%d **
  ",

  			CONFIG_ENV_EXT4_FILE, CONFIG_ENV_EXT4_INTERFACE, dev,
  			part);

  		goto err_env_relocate;
  	}

  	return env_import(buf, 1);

  
  err_env_relocate:
  	set_default_env(NULL);

  
  	return -EIO;

  }

  
  U_BOOT_ENV_LOCATION(ext4) = {
  	.location	= ENVL_EXT4,

  	ENV_NAME("EXT4")

  	.load		= env_ext4_load,
  	.save		= env_save_ptr(env_ext4_save),

  };