/*

   * (C) Copyright 2010 DENX Software Engineering
   * Wolfgang Denk <wd@denx.de>
   *

   * (C) Copyright 2005-2009 Samsung Electronics

   * Kyungmin Park <kyungmin.park@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 <search.h>
  #include <errno.h>

  #include <onenand_uboot.h>

  #include <linux/compat.h>

  #include <linux/mtd/mtd.h>
  #include <linux/mtd/onenand.h>

  #define ONENAND_MAX_ENV_SIZE	CONFIG_ENV_SIZE

  #define ONENAND_ENV_SIZE(mtd)	(ONENAND_MAX_ENV_SIZE - ENV_HEADER_SIZE)

  DECLARE_GLOBAL_DATA_PTR;

  static int env_onenand_load(void)

  {

  	struct mtd_info *mtd = &onenand_mtd;

  #ifdef CONFIG_ENV_ADDR_FLEX

  	struct onenand_chip *this = &onenand_chip;

  #endif

  	int rc;

  	size_t retlen;

  #ifdef ENV_IS_EMBEDDED

  	char *buf = (char *)&environment;

  #else
  	loff_t env_addr = CONFIG_ENV_ADDR;

  	char onenand_env[ONENAND_MAX_ENV_SIZE];
  	char *buf = (char *)&onenand_env[0];

  #endif /* ENV_IS_EMBEDDED */

  #ifndef ENV_IS_EMBEDDED
  # ifdef CONFIG_ENV_ADDR_FLEX

  	if (FLEXONENAND(this))
  		env_addr = CONFIG_ENV_ADDR_FLEX;

  # endif

  	/* Check OneNAND exist */

  	if (mtd->writesize)

  		/* Ignore read fail */

  		mtd_read(mtd, env_addr, ONENAND_MAX_ENV_SIZE,

  				&retlen, (u_char *)buf);

  	else

  		mtd->writesize = MAX_ONENAND_PAGESIZE;

  #endif /* !ENV_IS_EMBEDDED */

  	rc = env_import(buf, 1);

  	if (!rc)

  		gd->env_valid = ENV_VALID;

  	return rc;

  }

  static int env_onenand_save(void)

  {

  	env_t	env_new;

  	int ret;

  	struct mtd_info *mtd = &onenand_mtd;

  #ifdef CONFIG_ENV_ADDR_FLEX

  	struct onenand_chip *this = &onenand_chip;

  #endif

  	loff_t	env_addr = CONFIG_ENV_ADDR;
  	size_t	retlen;

  	struct erase_info instr = {
  		.callback	= NULL,
  	};

  	ret = env_export(&env_new);
  	if (ret)
  		return ret;

  	instr.len = CONFIG_ENV_SIZE;

  #ifdef CONFIG_ENV_ADDR_FLEX

  	if (FLEXONENAND(this)) {
  		env_addr = CONFIG_ENV_ADDR_FLEX;
  		instr.len = CONFIG_ENV_SIZE_FLEX;
  		instr.len <<= onenand_mtd.eraseregions[0].numblocks == 1 ?
  				1 : 0;
  	}

  #endif

  	instr.addr = env_addr;

  	instr.mtd = mtd;

  	if (mtd_erase(mtd, &instr)) {

  		printf("OneNAND: erase failed at 0x%08llx
  ", env_addr);

  		return 1;
  	}

  	if (mtd_write(mtd, env_addr, ONENAND_MAX_ENV_SIZE, &retlen,

  			(u_char *)&env_new)) {

  		printf("OneNAND: write failed at 0x%llx
  ", instr.addr);

  		return 2;
  	}
  
  	return 0;
  }

  U_BOOT_ENV_LOCATION(onenand) = {
  	.location	= ENVL_ONENAND,

  	ENV_NAME("OneNAND")

  	.load		= env_onenand_load,
  	.save		= env_save_ptr(env_onenand_save),

  };