env/mmc.c - mirrors/cros/chromiumos/third_party/u-boot - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * (C) Copyright 2008-2011 Freescale Semiconductor, Inc.
  */

 /* #define DEBUG */

 #include <common.h>
 #include <asm/global_data.h>

 #include <command.h>
 #include <env.h>
 #include <env_internal.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>
 #include <dm/ofnode.h>

 #define ENV_MMC_INVALID_OFFSET ((s64)-1)

 #if defined(CONFIG_ENV_MMC_USE_DT)
 /* ENV offset is invalid when not defined in Device Tree */
 #define ENV_MMC_OFFSET		ENV_MMC_INVALID_OFFSET
 #define ENV_MMC_OFFSET_REDUND	ENV_MMC_INVALID_OFFSET

 #else
 /* Default ENV offset when not defined in Device Tree */
 #define ENV_MMC_OFFSET		CONFIG_ENV_OFFSET

 #if defined(CONFIG_ENV_OFFSET_REDUND)
 #define ENV_MMC_OFFSET_REDUND	CONFIG_ENV_OFFSET_REDUND
 #else
 #define ENV_MMC_OFFSET_REDUND	ENV_MMC_INVALID_OFFSET
 #endif
 #endif

 DECLARE_GLOBAL_DATA_PTR;

 /*
  * In case the environment is redundant, stored in eMMC hardware boot
  * partition and the environment and redundant environment offsets are
  * identical, store the environment and redundant environment in both
  * eMMC boot partitions, one copy in each.
  * */
 #if (defined(CONFIG_SYS_REDUNDAND_ENVIRONMENT) && \
      (CONFIG_SYS_MMC_ENV_PART == 1) && \
      (CONFIG_ENV_OFFSET == CONFIG_ENV_OFFSET_REDUND))
 #define ENV_MMC_HWPART_REDUND	1
 #endif

 #if CONFIG_IS_ENABLED(OF_CONTROL)
 static inline int mmc_offset_try_partition(const char *str, int copy, s64 *val)
 {
 	struct disk_partition info;
 	struct blk_desc *desc;
 	int len, i, ret;
 	char dev_str[4];

 	snprintf(dev_str, sizeof(dev_str), "%d", mmc_get_env_dev());
 	ret = blk_get_device_by_str("mmc", dev_str, &desc);
 	if (ret < 0)
 		return (ret);

 	for (i = 1;;i++) {
 		ret = part_get_info(desc, i, &info);
 		if (ret < 0)
 			return ret;

 		if (str && !strncmp((const char *)info.name, str, sizeof(info.name)))
 			break;
 #ifdef CONFIG_PARTITION_TYPE_GUID
 		if (!str) {
 			const efi_guid_t env_guid = PARTITION_U_BOOT_ENVIRONMENT;
 			efi_guid_t type_guid;

 			uuid_str_to_bin(info.type_guid, type_guid.b, UUID_STR_FORMAT_GUID);
 			if (!memcmp(&env_guid, &type_guid, sizeof(efi_guid_t)))
 				break;
 		}
 #endif
 	}

 	/* round up to info.blksz */
 	len = DIV_ROUND_UP(CONFIG_ENV_SIZE, info.blksz);

 	/* use the top of the partion for the environment */
 	*val = (info.start + info.size - (1 + copy) * len) * info.blksz;

 	return 0;
 }

 static inline s64 mmc_offset(struct mmc *mmc, 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 hwpart = 0;
 	int err;

 	if (IS_ENABLED(CONFIG_SYS_MMC_ENV_PART))
 		hwpart = mmc_get_env_part(mmc);

 	/* look for the partition in mmc CONFIG_SYS_MMC_ENV_DEV */
 	str = ofnode_conf_read_str(dt_prop.partition);
 	if (str) {
 		/* try to place the environment at end of the partition */
 		err = mmc_offset_try_partition(str, copy, &val);
 		if (!err)
 			return val;
 		debug("env partition '%s' not found (%d)", str, err);
 	}

 	/* try the GPT partition with "U-Boot ENV" TYPE GUID */
 	if (IS_ENABLED(CONFIG_PARTITION_TYPE_GUID) && hwpart == 0) {
 		err = mmc_offset_try_partition(NULL, copy, &val);
 		if (!err)
 			return val;
 	}

 	defvalue = ENV_MMC_OFFSET;
 	propname = dt_prop.offset;

 	if (IS_ENABLED(CONFIG_SYS_REDUNDAND_ENVIRONMENT) && copy) {
 		defvalue = ENV_MMC_OFFSET_REDUND;
 		propname = dt_prop.offset_redund;
 	}

 	return ofnode_conf_read_int(propname, defvalue);
 }
 #else
 static inline s64 mmc_offset(struct mmc *mmc, int copy)
 {
 	s64 offset = ENV_MMC_OFFSET;

 	if (IS_ENABLED(CONFIG_SYS_REDUNDAND_ENVIRONMENT) && copy)
 		offset = ENV_MMC_OFFSET_REDUND;

 	return offset;
 }
 #endif

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

 	if (offset == ENV_MMC_INVALID_OFFSET) {
 		printf("Invalid ENV offset in MMC, copy=%d\n", copy);
 		return -ENOENT;
 	}

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

 	*env_addr = offset;

 	return 0;
 }

 #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)
 {
 	int dev = mmc_get_env_dev();
 	int ret = 0;

 	ret = blk_select_hwpart_devnum(UCLASS_MMC, dev, part);
 	if (ret)
 		puts("MMC partition switch failed\n");

 	return ret;
 }

 static bool mmc_set_env_part_init(struct mmc *mmc)
 {
 	env_mmc_orig_hwpart = mmc_get_blk_desc(mmc)->hwpart;
 	if (mmc_set_env_part(mmc, mmc_get_env_part(mmc)))
 		return false;

 	return true;
 }

 static int mmc_set_env_part_restore(struct mmc *mmc)
 {
 	return mmc_set_env_part(mmc, env_mmc_orig_hwpart);
 }
 #else
 static inline int mmc_set_env_part(struct mmc *mmc, uint part) {return 0; };
 static bool mmc_set_env_part_init(struct mmc *mmc) {return true; }
 static inline int mmc_set_env_part_restore(struct mmc *mmc) {return 0; };
 #endif

 static const char *init_mmc_for_env(struct mmc *mmc)
 {
 	if (!mmc)
 		return "No MMC card found";

 #if CONFIG_IS_ENABLED(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_init(mmc))
 		return "MMC partition switch failed";

 	return NULL;
 }

 static void fini_mmc_for_env(struct mmc *mmc)
 {
 	mmc_set_env_part_restore(mmc);
 }

 #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\n", errmsg);
 		return 1;
 	}

 	ret = env_export(env_new);
 	if (ret)
 		goto fini;

 	if (IS_ENABLED(CONFIG_SYS_REDUNDAND_ENVIRONMENT)) {
 		if (gd->env_valid == ENV_VALID)
 			copy = 1;

 		if (IS_ENABLED(ENV_MMC_HWPART_REDUND)) {
 			ret = mmc_set_env_part(mmc, copy + 1);
 			if (ret)
 				goto fini;
 		}
 	}

 	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\n");
 		ret = 1;
 		goto fini;
 	}

 	ret = 0;

 	if (IS_ENABLED(CONFIG_SYS_REDUNDAND_ENVIRONMENT))
 		gd->env_valid = gd->env_valid == ENV_REDUND ? ENV_VALID : ENV_REDUND;

 fini:
 	fini_mmc_for_env(mmc);

 	return ret;
 }

 static inline int erase_env(struct mmc *mmc, unsigned long size,
 			    unsigned long offset)
 {
 	uint blk_start, blk_cnt, n;
 	struct blk_desc *desc = mmc_get_blk_desc(mmc);
 	u32 erase_size;

 	erase_size = mmc->erase_grp_size * desc->blksz;
 	blk_start = ALIGN_DOWN(offset, erase_size) / desc->blksz;
 	blk_cnt = ALIGN(size, erase_size) / desc->blksz;

 	n = blk_derase(desc, blk_start, blk_cnt);
 	printf("%d blocks erased at 0x%x: %s\n", n, blk_start,
 	       (n == blk_cnt) ? "OK" : "ERROR");

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

 static int env_mmc_erase(void)
 {
 	int dev = mmc_get_env_dev();
 	struct mmc *mmc = find_mmc_device(dev);
 	int	ret, copy = 0;
 	u32	offset;
 	const char *errmsg;

 	errmsg = init_mmc_for_env(mmc);
 	if (errmsg) {
 		printf("%s\n", errmsg);
 		return 1;
 	}

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

 	printf("\n");
 	ret = erase_env(mmc, CONFIG_ENV_SIZE, offset);

 	if (IS_ENABLED(CONFIG_SYS_REDUNDAND_ENVIRONMENT)) {
 		copy = 1;

 		if (IS_ENABLED(ENV_MMC_HWPART_REDUND)) {
 			ret = mmc_set_env_part(mmc, copy + 1);
 			if (ret)
 				goto fini;
 		}

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

 		ret |= erase_env(mmc, CONFIG_ENV_SIZE, offset);
 	}

 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;
 }

 #if defined(ENV_IS_EMBEDDED)
 static int env_mmc_load(void)
 {
 	return 0;
 }
 #elif defined(CONFIG_SYS_REDUNDAND_ENVIRONMENT)
 static int env_mmc_load(void)
 {
 	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;
 	}

 	if (IS_ENABLED(ENV_MMC_HWPART_REDUND)) {
 		ret = mmc_set_env_part(mmc, 1);
 		if (ret)
 			goto fini;
 	}

 	read1_fail = read_env(mmc, CONFIG_ENV_SIZE, offset1, tmp_env1);

 	if (IS_ENABLED(ENV_MMC_HWPART_REDUND)) {
 		ret = mmc_set_env_part(mmc, 2);
 		if (ret)
 			goto fini;
 	}

 	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, H_EXTERNAL);

 fini:
 	fini_mmc_for_env(mmc);
 err:
 	if (ret)
 		env_set_default(errmsg, 0);

 	return ret;
 }
 #else /* ! CONFIG_SYS_REDUNDAND_ENVIRONMENT */
 static int env_mmc_load(void)
 {
 	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;
 	env_t *ep = 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, &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, H_EXTERNAL);
 	if (!ret) {
 		ep = (env_t *)buf;
 		gd->env_addr = (ulong)&ep->data;
 	}

 fini:
 	fini_mmc_for_env(mmc);
 err:
 	if (ret)
 		env_set_default(errmsg, 0);

 	return ret;
 }
 #endif /* CONFIG_SYS_REDUNDAND_ENVIRONMENT */

 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),
 	.erase		= ENV_ERASE_PTR(env_mmc_erase)
 #endif
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* (C) Copyright 2008-2011 Freescale Semiconductor, Inc.
	*/

	/* #define DEBUG */

	#include <common.h>
	#include <asm/global_data.h>

	#include <command.h>
	#include <env.h>
	#include <env_internal.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>
	#include <dm/ofnode.h>

	#define ENV_MMC_INVALID_OFFSET ((s64)-1)

	#if defined(CONFIG_ENV_MMC_USE_DT)
	/* ENV offset is invalid when not defined in Device Tree */
	#define ENV_MMC_OFFSET ENV_MMC_INVALID_OFFSET
	#define ENV_MMC_OFFSET_REDUND ENV_MMC_INVALID_OFFSET

	#else
	/* Default ENV offset when not defined in Device Tree */
	#define ENV_MMC_OFFSET CONFIG_ENV_OFFSET

	#if defined(CONFIG_ENV_OFFSET_REDUND)
	#define ENV_MMC_OFFSET_REDUND CONFIG_ENV_OFFSET_REDUND
	#else
	#define ENV_MMC_OFFSET_REDUND ENV_MMC_INVALID_OFFSET
	#endif
	#endif

	DECLARE_GLOBAL_DATA_PTR;

	/*
	* In case the environment is redundant, stored in eMMC hardware boot
	* partition and the environment and redundant environment offsets are
	* identical, store the environment and redundant environment in both
	* eMMC boot partitions, one copy in each.
	* */
	#if (defined(CONFIG_SYS_REDUNDAND_ENVIRONMENT) && \
	(CONFIG_SYS_MMC_ENV_PART == 1) && \
	(CONFIG_ENV_OFFSET == CONFIG_ENV_OFFSET_REDUND))
	#define ENV_MMC_HWPART_REDUND 1
	#endif

	#if CONFIG_IS_ENABLED(OF_CONTROL)
	static inline int mmc_offset_try_partition(const char str, int copy, s64 val)
	{
	struct disk_partition info;
	struct blk_desc *desc;
	int len, i, ret;
	char dev_str[4];

	snprintf(dev_str, sizeof(dev_str), "%d", mmc_get_env_dev());
	ret = blk_get_device_by_str("mmc", dev_str, &desc);
	if (ret < 0)
	return (ret);

	for (i = 1;;i++) {
	ret = part_get_info(desc, i, &info);
	if (ret < 0)
	return ret;

	if (str && !strncmp((const char *)info.name, str, sizeof(info.name)))
	break;
	#ifdef CONFIG_PARTITION_TYPE_GUID
	if (!str) {
	const efi_guid_t env_guid = PARTITION_U_BOOT_ENVIRONMENT;
	efi_guid_t type_guid;

	uuid_str_to_bin(info.type_guid, type_guid.b, UUID_STR_FORMAT_GUID);
	if (!memcmp(&env_guid, &type_guid, sizeof(efi_guid_t)))
	break;
	}
	#endif
	}

	/* round up to info.blksz */
	len = DIV_ROUND_UP(CONFIG_ENV_SIZE, info.blksz);

	/* use the top of the partion for the environment */
	val = (info.start + info.size - (1 + copy) len) * info.blksz;

	return 0;
	}

	static inline s64 mmc_offset(struct mmc *mmc, 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 hwpart = 0;
	int err;

	if (IS_ENABLED(CONFIG_SYS_MMC_ENV_PART))
	hwpart = mmc_get_env_part(mmc);

	/* look for the partition in mmc CONFIG_SYS_MMC_ENV_DEV */
	str = ofnode_conf_read_str(dt_prop.partition);
	if (str) {
	/* try to place the environment at end of the partition */
	err = mmc_offset_try_partition(str, copy, &val);
	if (!err)
	return val;
	debug("env partition '%s' not found (%d)", str, err);
	}

	/* try the GPT partition with "U-Boot ENV" TYPE GUID */
	if (IS_ENABLED(CONFIG_PARTITION_TYPE_GUID) && hwpart == 0) {
	err = mmc_offset_try_partition(NULL, copy, &val);
	if (!err)
	return val;
	}

	defvalue = ENV_MMC_OFFSET;
	propname = dt_prop.offset;

	if (IS_ENABLED(CONFIG_SYS_REDUNDAND_ENVIRONMENT) && copy) {
	defvalue = ENV_MMC_OFFSET_REDUND;
	propname = dt_prop.offset_redund;
	}

	return ofnode_conf_read_int(propname, defvalue);
	}
	#else
	static inline s64 mmc_offset(struct mmc *mmc, int copy)
	{
	s64 offset = ENV_MMC_OFFSET;

	if (IS_ENABLED(CONFIG_SYS_REDUNDAND_ENVIRONMENT) && copy)
	offset = ENV_MMC_OFFSET_REDUND;

	return offset;
	}
	#endif

	__weak int mmc_get_env_addr(struct mmc mmc, int copy, u32 env_addr)
	{
	s64 offset = mmc_offset(mmc, copy);

	if (offset == ENV_MMC_INVALID_OFFSET) {
	printf("Invalid ENV offset in MMC, copy=%d\n", copy);
	return -ENOENT;
	}

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

	*env_addr = offset;

	return 0;
	}

	#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)
	{
	int dev = mmc_get_env_dev();
	int ret = 0;

	ret = blk_select_hwpart_devnum(UCLASS_MMC, dev, part);
	if (ret)
	puts("MMC partition switch failed\n");

	return ret;
	}

	static bool mmc_set_env_part_init(struct mmc *mmc)
	{
	env_mmc_orig_hwpart = mmc_get_blk_desc(mmc)->hwpart;
	if (mmc_set_env_part(mmc, mmc_get_env_part(mmc)))
	return false;

	return true;
	}

	static int mmc_set_env_part_restore(struct mmc *mmc)
	{
	return mmc_set_env_part(mmc, env_mmc_orig_hwpart);
	}
	#else
	static inline int mmc_set_env_part(struct mmc *mmc, uint part) {return 0; };
	static bool mmc_set_env_part_init(struct mmc *mmc) {return true; }
	static inline int mmc_set_env_part_restore(struct mmc *mmc) {return 0; };
	#endif

	static const char init_mmc_for_env(struct mmc mmc)
	{
	if (!mmc)
	return "No MMC card found";

	#if CONFIG_IS_ENABLED(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_init(mmc))
	return "MMC partition switch failed";

	return NULL;
	}

	static void fini_mmc_for_env(struct mmc *mmc)
	{
	mmc_set_env_part_restore(mmc);
	}

	#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\n", errmsg);
	return 1;
	}

	ret = env_export(env_new);
	if (ret)
	goto fini;

	if (IS_ENABLED(CONFIG_SYS_REDUNDAND_ENVIRONMENT)) {
	if (gd->env_valid == ENV_VALID)
	copy = 1;

	if (IS_ENABLED(ENV_MMC_HWPART_REDUND)) {
	ret = mmc_set_env_part(mmc, copy + 1);
	if (ret)
	goto fini;
	}
	}

	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\n");
	ret = 1;
	goto fini;
	}

	ret = 0;

	if (IS_ENABLED(CONFIG_SYS_REDUNDAND_ENVIRONMENT))
	gd->env_valid = gd->env_valid == ENV_REDUND ? ENV_VALID : ENV_REDUND;

	fini:
	fini_mmc_for_env(mmc);

	return ret;
	}

	static inline int erase_env(struct mmc *mmc, unsigned long size,
	unsigned long offset)
	{
	uint blk_start, blk_cnt, n;
	struct blk_desc *desc = mmc_get_blk_desc(mmc);
	u32 erase_size;

	erase_size = mmc->erase_grp_size * desc->blksz;
	blk_start = ALIGN_DOWN(offset, erase_size) / desc->blksz;
	blk_cnt = ALIGN(size, erase_size) / desc->blksz;

	n = blk_derase(desc, blk_start, blk_cnt);
	printf("%d blocks erased at 0x%x: %s\n", n, blk_start,
	(n == blk_cnt) ? "OK" : "ERROR");

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

	static int env_mmc_erase(void)
	{
	int dev = mmc_get_env_dev();
	struct mmc *mmc = find_mmc_device(dev);
	int ret, copy = 0;
	u32 offset;
	const char *errmsg;

	errmsg = init_mmc_for_env(mmc);
	if (errmsg) {
	printf("%s\n", errmsg);
	return 1;
	}

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

	printf("\n");
	ret = erase_env(mmc, CONFIG_ENV_SIZE, offset);

	if (IS_ENABLED(CONFIG_SYS_REDUNDAND_ENVIRONMENT)) {
	copy = 1;

	if (IS_ENABLED(ENV_MMC_HWPART_REDUND)) {
	ret = mmc_set_env_part(mmc, copy + 1);
	if (ret)
	goto fini;
	}

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

	ret \|= erase_env(mmc, CONFIG_ENV_SIZE, offset);
	}

	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;
	}

	#if defined(ENV_IS_EMBEDDED)
	static int env_mmc_load(void)
	{
	return 0;
	}
	#elif defined(CONFIG_SYS_REDUNDAND_ENVIRONMENT)
	static int env_mmc_load(void)
	{
	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;
	}

	if (IS_ENABLED(ENV_MMC_HWPART_REDUND)) {
	ret = mmc_set_env_part(mmc, 1);
	if (ret)
	goto fini;
	}

	read1_fail = read_env(mmc, CONFIG_ENV_SIZE, offset1, tmp_env1);

	if (IS_ENABLED(ENV_MMC_HWPART_REDUND)) {
	ret = mmc_set_env_part(mmc, 2);
	if (ret)
	goto fini;
	}

	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, H_EXTERNAL);

	fini:
	fini_mmc_for_env(mmc);
	err:
	if (ret)
	env_set_default(errmsg, 0);

	return ret;
	}
	#else /* ! CONFIG_SYS_REDUNDAND_ENVIRONMENT */
	static int env_mmc_load(void)
	{
	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;
	env_t *ep = 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, &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, H_EXTERNAL);
	if (!ret) {
	ep = (env_t *)buf;
	gd->env_addr = (ulong)&ep->data;
	}

	fini:
	fini_mmc_for_env(mmc);
	err:
	if (ret)
	env_set_default(errmsg, 0);

	return ret;
	}
	#endif /* CONFIG_SYS_REDUNDAND_ENVIRONMENT */

	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),
	.erase = ENV_ERASE_PTR(env_mmc_erase)
	#endif
	};