/*

   * (C) Copyright 2000-2010

   * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   *
   * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   * Andreas Heppel <aheppel@sysgo.de>
   *
   * (C) Copyright 2008 Atmel Corporation
   *

   * SPDX-License-Identifier:	GPL-2.0+

   */
  #include <common.h>

  #include <environment.h>

  #include <malloc.h>

  #include <spi.h>

  #include <spi_flash.h>

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

  #ifndef CONFIG_ENV_SPI_BUS
  # define CONFIG_ENV_SPI_BUS	0

  #endif

  #ifndef CONFIG_ENV_SPI_CS

  # define CONFIG_ENV_SPI_CS	0

  #endif

  #ifndef CONFIG_ENV_SPI_MAX_HZ
  # define CONFIG_ENV_SPI_MAX_HZ	1000000

  #endif

  #ifndef CONFIG_ENV_SPI_MODE
  # define CONFIG_ENV_SPI_MODE	SPI_MODE_3

  #endif

  #ifdef CONFIG_ENV_OFFSET_REDUND

  static ulong env_offset		= CONFIG_ENV_OFFSET;
  static ulong env_new_offset	= CONFIG_ENV_OFFSET_REDUND;

  #define ACTIVE_FLAG	1
  #define OBSOLETE_FLAG	0

  #endif /* CONFIG_ENV_OFFSET_REDUND */

  DECLARE_GLOBAL_DATA_PTR;

  char *env_name_spec = "SPI Flash";

  
  static struct spi_flash *env_flash;

  #if defined(CONFIG_ENV_OFFSET_REDUND)

  int saveenv(void)
  {

  	env_t	env_new;

  	char	*saved_buffer = NULL, flag = OBSOLETE_FLAG;

  	u32	saved_size, saved_offset, sector = 1;

  	int	ret;

  
  	if (!env_flash) {

  		env_flash = spi_flash_probe(CONFIG_ENV_SPI_BUS,
  			CONFIG_ENV_SPI_CS,
  			CONFIG_ENV_SPI_MAX_HZ, CONFIG_ENV_SPI_MODE);
  		if (!env_flash) {
  			set_default_env("!spi_flash_probe() failed");
  			return 1;
  		}

  	}

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

  	env_new.flags	= ACTIVE_FLAG;

  	if (gd->env_valid == 1) {
  		env_new_offset = CONFIG_ENV_OFFSET_REDUND;
  		env_offset = CONFIG_ENV_OFFSET;
  	} else {
  		env_new_offset = CONFIG_ENV_OFFSET;
  		env_offset = CONFIG_ENV_OFFSET_REDUND;
  	}

  	/* Is the sector larger than the env (i.e. embedded) */
  	if (CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE) {
  		saved_size = CONFIG_ENV_SECT_SIZE - CONFIG_ENV_SIZE;
  		saved_offset = env_new_offset + CONFIG_ENV_SIZE;

  		saved_buffer = memalign(ARCH_DMA_MINALIGN, saved_size);

  		if (!saved_buffer) {
  			ret = 1;
  			goto done;
  		}
  		ret = spi_flash_read(env_flash, saved_offset,
  					saved_size, saved_buffer);
  		if (ret)
  			goto done;
  	}
  
  	if (CONFIG_ENV_SIZE > CONFIG_ENV_SECT_SIZE) {
  		sector = CONFIG_ENV_SIZE / CONFIG_ENV_SECT_SIZE;
  		if (CONFIG_ENV_SIZE % CONFIG_ENV_SECT_SIZE)
  			sector++;
  	}
  
  	puts("Erasing SPI flash...");
  	ret = spi_flash_erase(env_flash, env_new_offset,
  				sector * CONFIG_ENV_SECT_SIZE);
  	if (ret)
  		goto done;
  
  	puts("Writing to SPI flash...");

  	ret = spi_flash_write(env_flash, env_new_offset,

  		CONFIG_ENV_SIZE, &env_new);

  	if (ret)
  		goto done;
  
  	if (CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE) {
  		ret = spi_flash_write(env_flash, saved_offset,
  					saved_size, saved_buffer);
  		if (ret)
  			goto done;
  	}

  	ret = spi_flash_write(env_flash, env_offset + offsetof(env_t, flags),

  				sizeof(env_new.flags), &flag);

  	if (ret)
  		goto done;

  	puts("done
  ");

  	gd->env_valid = gd->env_valid == 2 ? 1 : 2;

  	printf("Valid environment: %d
  ", (int)gd->env_valid);

   done:
  	if (saved_buffer)
  		free(saved_buffer);

  	return ret;
  }
  
  void env_relocate_spec(void)
  {
  	int ret;
  	int crc1_ok = 0, crc2_ok = 0;
  	env_t *tmp_env1 = NULL;
  	env_t *tmp_env2 = NULL;

  	env_t *ep = NULL;

  	tmp_env1 = (env_t *)memalign(ARCH_DMA_MINALIGN,
  			CONFIG_ENV_SIZE);
  	tmp_env2 = (env_t *)memalign(ARCH_DMA_MINALIGN,
  			CONFIG_ENV_SIZE);

  	if (!tmp_env1 || !tmp_env2) {

  		set_default_env("!malloc() failed");

  		goto out;

  	}
  
  	env_flash = spi_flash_probe(CONFIG_ENV_SPI_BUS, CONFIG_ENV_SPI_CS,
  			CONFIG_ENV_SPI_MAX_HZ, CONFIG_ENV_SPI_MODE);

  	if (!env_flash) {
  		set_default_env("!spi_flash_probe() failed");

  		goto out;

  	}

  
  	ret = spi_flash_read(env_flash, CONFIG_ENV_OFFSET,
  				CONFIG_ENV_SIZE, tmp_env1);

  	if (ret) {
  		set_default_env("!spi_flash_read() failed");

  		goto err_read;

  	}

  
  	if (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc)
  		crc1_ok = 1;

  
  	ret = spi_flash_read(env_flash, CONFIG_ENV_OFFSET_REDUND,
  				CONFIG_ENV_SIZE, tmp_env2);
  	if (!ret) {
  		if (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc)
  			crc2_ok = 1;

  	}

  	if (!crc1_ok && !crc2_ok) {

  		set_default_env("!bad CRC");

  		goto err_read;

  	} else if (crc1_ok && !crc2_ok) {

  		gd->env_valid = 1;

  	} else if (!crc1_ok && crc2_ok) {

  		gd->env_valid = 2;
  	} else if (tmp_env1->flags == ACTIVE_FLAG &&
  		   tmp_env2->flags == OBSOLETE_FLAG) {

  		gd->env_valid = 1;

  	} else if (tmp_env1->flags == OBSOLETE_FLAG &&
  		   tmp_env2->flags == ACTIVE_FLAG) {

  		gd->env_valid = 2;

  	} else if (tmp_env1->flags == tmp_env2->flags) {

  		gd->env_valid = 1;

  	} else if (tmp_env1->flags == 0xFF) {

  		gd->env_valid = 1;
  	} else if (tmp_env2->flags == 0xFF) {

  		gd->env_valid = 2;

  	} else {
  		/*
  		 * this differs from code in env_flash.c, but I think a sane
  		 * default path is desirable.
  		 */

  		gd->env_valid = 1;

  	}

  	if (gd->env_valid == 1)
  		ep = tmp_env1;
  	else
  		ep = tmp_env2;
  
  	ret = env_import((char *)ep, 0);
  	if (!ret) {
  		error("Cannot import environment: errno = %d
  ", errno);
  		set_default_env("env_import failed");

  	}

  
  err_read:
  	spi_flash_free(env_flash);
  	env_flash = NULL;

  out:

  	free(tmp_env1);
  	free(tmp_env2);

  }
  #else

  int saveenv(void)
  {

  	u32	saved_size, saved_offset, sector = 1;

  	char	*saved_buffer = NULL;

  	int	ret = 1;

  	env_t	env_new;

  	if (!env_flash) {

  		env_flash = spi_flash_probe(CONFIG_ENV_SPI_BUS,
  			CONFIG_ENV_SPI_CS,
  			CONFIG_ENV_SPI_MAX_HZ, CONFIG_ENV_SPI_MODE);
  		if (!env_flash) {
  			set_default_env("!spi_flash_probe() failed");
  			return 1;
  		}

  	}

  	/* Is the sector larger than the env (i.e. embedded) */
  	if (CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE) {
  		saved_size = CONFIG_ENV_SECT_SIZE - CONFIG_ENV_SIZE;
  		saved_offset = CONFIG_ENV_OFFSET + CONFIG_ENV_SIZE;
  		saved_buffer = malloc(saved_size);

  		if (!saved_buffer)

  			goto done;

  		ret = spi_flash_read(env_flash, saved_offset,
  			saved_size, saved_buffer);

  		if (ret)
  			goto done;
  	}

  	if (CONFIG_ENV_SIZE > CONFIG_ENV_SECT_SIZE) {
  		sector = CONFIG_ENV_SIZE / CONFIG_ENV_SECT_SIZE;
  		if (CONFIG_ENV_SIZE % CONFIG_ENV_SECT_SIZE)

  			sector++;
  	}

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

  		goto done;

  	puts("Erasing SPI flash...");

  	ret = spi_flash_erase(env_flash, CONFIG_ENV_OFFSET,
  		sector * CONFIG_ENV_SECT_SIZE);

  	if (ret)
  		goto done;

  
  	puts("Writing to SPI flash...");

  	ret = spi_flash_write(env_flash, CONFIG_ENV_OFFSET,

  		CONFIG_ENV_SIZE, &env_new);

  	if (ret)
  		goto done;

  	if (CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE) {

  		ret = spi_flash_write(env_flash, saved_offset,
  			saved_size, saved_buffer);

  		if (ret)
  			goto done;
  	}
  
  	ret = 0;

  	puts("done
  ");

  
   done:
  	if (saved_buffer)
  		free(saved_buffer);

  	return ret;

  }
  
  void env_relocate_spec(void)
  {
  	int ret;

  	char *buf = NULL;

  	buf = (char *)memalign(ARCH_DMA_MINALIGN, CONFIG_ENV_SIZE);

  	env_flash = spi_flash_probe(CONFIG_ENV_SPI_BUS, CONFIG_ENV_SPI_CS,
  			CONFIG_ENV_SPI_MAX_HZ, CONFIG_ENV_SPI_MODE);

  	if (!env_flash) {
  		set_default_env("!spi_flash_probe() failed");

  		if (buf)
  			free(buf);

  		return;
  	}

  	ret = spi_flash_read(env_flash,
  		CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE, buf);
  	if (ret) {
  		set_default_env("!spi_flash_read() failed");
  		goto out;
  	}

  	ret = env_import(buf, 1);

  	if (ret)
  		gd->env_valid = 1;
  out:

  	spi_flash_free(env_flash);

  	if (buf)
  		free(buf);

  	env_flash = NULL;

  }

  #endif

  
  int env_init(void)
  {
  	/* SPI flash isn't usable before relocation */
  	gd->env_addr = (ulong)&default_environment[0];
  	gd->env_valid = 1;
  
  	return 0;
  }