/*

   * (C) Copyright 2008-2011 Freescale Semiconductor, Inc.

   *

   * SPDX-License-Identifier:	GPL-2.0+

   */
  
  /* #define DEBUG */
  
  #include <common.h>
  
  #include <command.h>
  #include <environment.h>

  #include <fdtdec.h>

  #include <linux/stddef.h>
  #include <malloc.h>

  #include <memalign.h>

  #include <mmc.h>

  #include <part.h>

  #include <search.h>

  #include <errno.h>

  #define __STR(X) #X
  #define STR(X) __STR(X)

  #if defined(CONFIG_ENV_SIZE_REDUND) &&  \
  	(CONFIG_ENV_SIZE_REDUND != CONFIG_ENV_SIZE)
  #error CONFIG_ENV_SIZE_REDUND should be the same as CONFIG_ENV_SIZE
  #endif

  DECLARE_GLOBAL_DATA_PTR;

  #if !defined(CONFIG_ENV_OFFSET)
  #define CONFIG_ENV_OFFSET 0
  #endif

  #if CONFIG_IS_ENABLED(OF_CONTROL)

  static inline int mmc_offset_try_partition(const char *str, s64 *val)
  {
  	disk_partition_t info;
  	struct blk_desc *desc;
  	int len, i, ret;
  
  	ret = blk_get_device_by_str("mmc", STR(CONFIG_SYS_MMC_ENV_DEV), &desc);
  	if (ret < 0)
  		return (ret);
  
  	for (i = 1;;i++) {
  		ret = part_get_info(desc, i, &info);
  		if (ret < 0)
  			return ret;
  
  		if (!strncmp((const char *)info.name, str, sizeof(str)))
  			break;
  	}
  
  	/* round up to info.blksz */
  	len = (CONFIG_ENV_SIZE + info.blksz - 1) & ~(info.blksz - 1);
  
  	/* use the top of the partion for the environment */
  	*val = (info.start + info.size - 1) - len / info.blksz;
  
  	return 0;
  }

  static inline s64 mmc_offset(int copy)
  {

  	const struct {
  		const char *offset_redund;
  		const char *partition;
  		const char *offset;
  	} dt_prop = {
  		.offset_redund = "u-boot,mmc-env-offset-redundant",
  		.partition = "u-boot,mmc-env-partition",
  		.offset = "u-boot,mmc-env-offset",
  	};

  	s64 val = 0, defvalue;

  	const char *propname;
  	const char *str;
  	int err;
  
  	/* look for the partition in mmc CONFIG_SYS_MMC_ENV_DEV */
  	str = fdtdec_get_config_string(gd->fdt_blob, dt_prop.partition);
  	if (str) {
  		/* try to place the environment at end of the partition */
  		err = mmc_offset_try_partition(str, &val);
  		if (!err)
  			return val;
  	}
  
  	defvalue = CONFIG_ENV_OFFSET;
  	propname = dt_prop.offset;

  
  #if defined(CONFIG_ENV_OFFSET_REDUND)
  	if (copy) {

  		defvalue = CONFIG_ENV_OFFSET_REDUND;

  		propname = dt_prop.offset_redund;

  	}
  #endif

  	return fdtdec_get_config_int(gd->fdt_blob, propname, defvalue);
  }
  #else
  static inline s64 mmc_offset(int copy)

  {

  	s64 offset = CONFIG_ENV_OFFSET;

  #if defined(CONFIG_ENV_OFFSET_REDUND)

  	if (copy)

  		offset = CONFIG_ENV_OFFSET_REDUND;

  #endif

  	return offset;
  }
  #endif
  
  __weak int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr)
  {
  	s64 offset = mmc_offset(copy);

  
  	if (offset < 0)
  		offset += mmc->capacity;
  
  	*env_addr = offset;

  	return 0;
  }

  __weak int mmc_get_env_dev(void)
  {
  	return CONFIG_SYS_MMC_ENV_DEV;
  }

  #ifdef CONFIG_SYS_MMC_ENV_PART

  __weak uint mmc_get_env_part(struct mmc *mmc)
  {
  	return CONFIG_SYS_MMC_ENV_PART;
  }

  static unsigned char env_mmc_orig_hwpart;

  static int mmc_set_env_part(struct mmc *mmc)
  {
  	uint part = mmc_get_env_part(mmc);

  	int dev = mmc_get_env_dev();

  	int ret = 0;

  	env_mmc_orig_hwpart = mmc_get_blk_desc(mmc)->hwpart;
  	ret = blk_select_hwpart_devnum(IF_TYPE_MMC, dev, part);

  	if (ret)
  		puts("MMC partition switch failed
  ");

  
  	return ret;
  }
  #else
  static inline int mmc_set_env_part(struct mmc *mmc) {return 0; };

  #endif

  static const char *init_mmc_for_env(struct mmc *mmc)

  {

  	if (!mmc)

  		return "!No MMC card found";

  #ifdef CONFIG_BLK
  	struct udevice *dev;
  
  	if (blk_get_from_parent(mmc->dev, &dev))
  		return "!No block device";
  #else

  	if (mmc_init(mmc))

  		return "!MMC init failed";

  #endif

  	if (mmc_set_env_part(mmc))

  		return "!MMC partition switch failed";

  	return NULL;

  }

  static void fini_mmc_for_env(struct mmc *mmc)
  {
  #ifdef CONFIG_SYS_MMC_ENV_PART

  	int dev = mmc_get_env_dev();

  	blk_select_hwpart_devnum(IF_TYPE_MMC, dev, env_mmc_orig_hwpart);

  #endif
  }

  #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_SPL_BUILD)

  static inline int write_env(struct mmc *mmc, unsigned long size,
  			    unsigned long offset, const void *buffer)

  {
  	uint blk_start, blk_cnt, n;

  	struct blk_desc *desc = mmc_get_blk_desc(mmc);

  	blk_start	= ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
  	blk_cnt		= ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;

  	n = blk_dwrite(desc, blk_start, blk_cnt, (u_char *)buffer);

  
  	return (n == blk_cnt) ? 0 : -1;
  }

  static int env_mmc_save(void)

  {

  	ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);

  	int dev = mmc_get_env_dev();
  	struct mmc *mmc = find_mmc_device(dev);

  	u32	offset;

  	int	ret, copy = 0;

  	const char *errmsg;

  	errmsg = init_mmc_for_env(mmc);
  	if (errmsg) {
  		printf("%s
  ", errmsg);

  		return 1;

  	}

  	ret = env_export(env_new);
  	if (ret)

  		goto fini;

  
  #ifdef CONFIG_ENV_OFFSET_REDUND

  	if (gd->env_valid == ENV_VALID)

  		copy = 1;
  #endif
  
  	if (mmc_get_env_addr(mmc, copy, &offset)) {
  		ret = 1;
  		goto fini;
  	}

  	printf("Writing to %sMMC(%d)... ", copy ? "redundant " : "", dev);

  	if (write_env(mmc, CONFIG_ENV_SIZE, offset, (u_char *)env_new)) {

  		puts("failed
  ");

  		ret = 1;
  		goto fini;

  	}

  	ret = 0;

  #ifdef CONFIG_ENV_OFFSET_REDUND

  	gd->env_valid = gd->env_valid == ENV_REDUND ? ENV_VALID : ENV_REDUND;

  #endif

  fini:
  	fini_mmc_for_env(mmc);
  	return ret;

  }

  #endif /* CONFIG_CMD_SAVEENV && !CONFIG_SPL_BUILD */

  static inline int read_env(struct mmc *mmc, unsigned long size,
  			   unsigned long offset, const void *buffer)

  {
  	uint blk_start, blk_cnt, n;

  	struct blk_desc *desc = mmc_get_blk_desc(mmc);

  	blk_start	= ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
  	blk_cnt		= ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len;

  	n = blk_dread(desc, blk_start, blk_cnt, (uchar *)buffer);

  
  	return (n == blk_cnt) ? 0 : -1;
  }

  #ifdef CONFIG_ENV_OFFSET_REDUND

  static int env_mmc_load(void)

  {
  #if !defined(ENV_IS_EMBEDDED)

  	struct mmc *mmc;

  	u32 offset1, offset2;
  	int read1_fail = 0, read2_fail = 0;

  	int ret;

  	int dev = mmc_get_env_dev();

  	const char *errmsg = NULL;

  	ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env1, 1);
  	ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env2, 1);

  	mmc_initialize(NULL);

  	mmc = find_mmc_device(dev);

  	errmsg = init_mmc_for_env(mmc);
  	if (errmsg) {

  		ret = -EIO;

  		goto err;
  	}
  
  	if (mmc_get_env_addr(mmc, 0, &offset1) ||
  	    mmc_get_env_addr(mmc, 1, &offset2)) {

  		ret = -EIO;

  		goto fini;
  	}
  
  	read1_fail = read_env(mmc, CONFIG_ENV_SIZE, offset1, tmp_env1);
  	read2_fail = read_env(mmc, CONFIG_ENV_SIZE, offset2, tmp_env2);

  	ret = env_import_redund((char *)tmp_env1, read1_fail, (char *)tmp_env2,
  				read2_fail);

  
  fini:
  	fini_mmc_for_env(mmc);
  err:
  	if (ret)

  		set_default_env(errmsg);

  #endif

  	return ret;

  }
  #else /* ! CONFIG_ENV_OFFSET_REDUND */

  static int env_mmc_load(void)

  {
  #if !defined(ENV_IS_EMBEDDED)

  	ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);

  	struct mmc *mmc;

  	u32 offset;

  	int ret;

  	int dev = mmc_get_env_dev();

  	const char *errmsg;

  	mmc = find_mmc_device(dev);

  	errmsg = init_mmc_for_env(mmc);
  	if (errmsg) {

  		ret = -EIO;

  		goto err;
  	}

  	if (mmc_get_env_addr(mmc, 0, &offset)) {

  		ret = -EIO;

  		goto fini;
  	}

  	if (read_env(mmc, CONFIG_ENV_SIZE, offset, buf)) {

  		errmsg = "!read failed";

  		ret = -EIO;

  		goto fini;
  	}

  	ret = env_import(buf, 1);

  
  fini:
  	fini_mmc_for_env(mmc);
  err:
  	if (ret)

  		set_default_env(errmsg);

  #endif

  	return ret;

  }

  #endif /* CONFIG_ENV_OFFSET_REDUND */

  
  U_BOOT_ENV_LOCATION(mmc) = {
  	.location	= ENVL_MMC,

  	ENV_NAME("MMC")

  	.load		= env_mmc_load,

  #ifndef CONFIG_SPL_BUILD

  	.save		= env_save_ptr(env_mmc_save),

  #endif

  };