drivers/dfu/dfu_mmc.c - uboot-imx - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * dfu.c -- DFU back-end routines
  *
  * Copyright (C) 2012 Samsung Electronics
  * author: Lukasz Majewski <l.majewski@samsung.com>
  */

 #include <common.h>
 #include <malloc.h>
 #include <errno.h>
 #include <div64.h>
 #include <dfu.h>
 #include <ext4fs.h>
 #include <fat.h>
 #include <mmc.h>

 static unsigned char *dfu_file_buf;
 static u64 dfu_file_buf_len;
 static long dfu_file_buf_filled;

 static int mmc_block_op(enum dfu_op op, struct dfu_entity *dfu,
 			u64 offset, void *buf, long *len)
 {
 	struct mmc *mmc;
 	u32 blk_start, blk_count, n = 0;
 	int ret, part_num_bkp = 0;

 	mmc = find_mmc_device(dfu->data.mmc.dev_num);
 	if (!mmc) {
 		pr_err("Device MMC %d - not found!", dfu->data.mmc.dev_num);
 		return -ENODEV;
 	}

 	/*
 	 * We must ensure that we work in lba_blk_size chunks, so ALIGN
 	 * this value.
 	 */
 	*len = ALIGN(*len, dfu->data.mmc.lba_blk_size);

 	blk_start = dfu->data.mmc.lba_start +
 			(u32)lldiv(offset, dfu->data.mmc.lba_blk_size);
 	blk_count = *len / dfu->data.mmc.lba_blk_size;
 	if (blk_start + blk_count >
 			dfu->data.mmc.lba_start + dfu->data.mmc.lba_size) {
 		puts("Request would exceed designated area!\n");
 		return -EINVAL;
 	}

 	if (dfu->data.mmc.hw_partition >= 0) {
 		part_num_bkp = mmc_get_blk_desc(mmc)->hwpart;
 		ret = blk_select_hwpart_devnum(IF_TYPE_MMC,
 					       dfu->data.mmc.dev_num,
 					       dfu->data.mmc.hw_partition);
 		if (ret)
 			return ret;
 	}

 	debug("%s: %s dev: %d start: %d cnt: %d buf: 0x%p\n", __func__,
 	      op == DFU_OP_READ ? "MMC READ" : "MMC WRITE",
 	      dfu->data.mmc.dev_num, blk_start, blk_count, buf);
 	switch (op) {
 	case DFU_OP_READ:
 		n = blk_dread(mmc_get_blk_desc(mmc), blk_start, blk_count, buf);
 		break;
 	case DFU_OP_WRITE:
 		n = blk_dwrite(mmc_get_blk_desc(mmc), blk_start, blk_count,
 			       buf);
 		break;
 	default:
 		pr_err("Operation not supported\n");
 	}

 	if (n != blk_count) {
 		pr_err("MMC operation failed");
 		if (dfu->data.mmc.hw_partition >= 0)
 			blk_select_hwpart_devnum(IF_TYPE_MMC,
 						 dfu->data.mmc.dev_num,
 						 part_num_bkp);
 		return -EIO;
 	}

 	if (dfu->data.mmc.hw_partition >= 0) {
 		ret = blk_select_hwpart_devnum(IF_TYPE_MMC,
 					       dfu->data.mmc.dev_num,
 					       part_num_bkp);
 		if (ret)
 			return ret;
 	}

 	return 0;
 }

 static int mmc_file_buffer(struct dfu_entity *dfu, void *buf, long *len)
 {
 	if (dfu_file_buf_len + *len > CONFIG_SYS_DFU_MAX_FILE_SIZE) {
 		dfu_file_buf_len = 0;
 		return -EINVAL;
 	}

 	/* Add to the current buffer. */
 	memcpy(dfu_file_buf + dfu_file_buf_len, buf, *len);
 	dfu_file_buf_len += *len;

 	return 0;
 }

 static int mmc_file_op(enum dfu_op op, struct dfu_entity *dfu,
 			void *buf, u64 *len)
 {
 	char dev_part_str[8];
 	int ret;
 	int fstype;
 	loff_t size = 0;

 	switch (dfu->layout) {
 	case DFU_FS_FAT:
 		fstype = FS_TYPE_FAT;
 		break;
 	case DFU_FS_EXT4:
 		fstype = FS_TYPE_EXT;
 		break;
 	default:
 		printf("%s: Layout (%s) not (yet) supported!\n", __func__,
 		       dfu_get_layout(dfu->layout));
 		return -1;
 	}

 	snprintf(dev_part_str, sizeof(dev_part_str), "%d:%d",
 		 dfu->data.mmc.dev, dfu->data.mmc.part);

 	ret = fs_set_blk_dev("mmc", dev_part_str, fstype);
 	if (ret) {
 		puts("dfu: fs_set_blk_dev error!\n");
 		return ret;
 	}

 	switch (op) {
 	case DFU_OP_READ:
 		ret = fs_read(dfu->name, (size_t)buf, 0, 0, &size);
 		if (ret) {
 			puts("dfu: fs_read error!\n");
 			return ret;
 		}
 		*len = size;
 		break;
 	case DFU_OP_WRITE:
 		ret = fs_write(dfu->name, (size_t)buf, 0, *len, &size);
 		if (ret) {
 			puts("dfu: fs_write error!\n");
 			return ret;
 		}
 		break;
 	case DFU_OP_SIZE:
 		ret = fs_size(dfu->name, &size);
 		if (ret) {
 			puts("dfu: fs_size error!\n");
 			return ret;
 		}
 		*len = size;
 		break;
 	default:
 		return -1;
 	}

 	return ret;
 }

 int dfu_write_medium_mmc(struct dfu_entity *dfu,
 		u64 offset, void *buf, long *len)
 {
 	int ret = -1;

 	switch (dfu->layout) {
 	case DFU_RAW_ADDR:
 		ret = mmc_block_op(DFU_OP_WRITE, dfu, offset, buf, len);
 		break;
 	case DFU_FS_FAT:
 	case DFU_FS_EXT4:
 		ret = mmc_file_buffer(dfu, buf, len);
 		break;
 	default:
 		printf("%s: Layout (%s) not (yet) supported!\n", __func__,
 		       dfu_get_layout(dfu->layout));
 	}

 	return ret;
 }

 int dfu_flush_medium_mmc(struct dfu_entity *dfu)
 {
 	int ret = 0;

 	if (dfu->layout != DFU_RAW_ADDR) {
 		/* Do stuff here. */
 		ret = mmc_file_op(DFU_OP_WRITE, dfu, dfu_file_buf,
 				&dfu_file_buf_len);

 		/* Now that we're done */
 		dfu_file_buf_len = 0;
 	}

 	return ret;
 }

 int dfu_get_medium_size_mmc(struct dfu_entity *dfu, u64 *size)
 {
 	int ret;

 	switch (dfu->layout) {
 	case DFU_RAW_ADDR:
 		*size = dfu->data.mmc.lba_size * dfu->data.mmc.lba_blk_size;
 		return 0;
 	case DFU_FS_FAT:
 	case DFU_FS_EXT4:
 		dfu_file_buf_filled = -1;
 		ret = mmc_file_op(DFU_OP_SIZE, dfu, NULL, size);
 		if (ret < 0)
 			return ret;
 		if (*size > CONFIG_SYS_DFU_MAX_FILE_SIZE)
 			return -1;
 		return 0;
 	default:
 		printf("%s: Layout (%s) not (yet) supported!\n", __func__,
 		       dfu_get_layout(dfu->layout));
 		return -1;
 	}
 }

 static int mmc_file_unbuffer(struct dfu_entity *dfu, u64 offset, void *buf,
 			     long *len)
 {
 	int ret;
 	u64 file_len;

 	if (dfu_file_buf_filled == -1) {
 		ret = mmc_file_op(DFU_OP_READ, dfu, dfu_file_buf, &file_len);
 		if (ret < 0)
 			return ret;
 		dfu_file_buf_filled = file_len;
 	}
 	if (offset + *len > dfu_file_buf_filled)
 		return -EINVAL;

 	/* Add to the current buffer. */
 	memcpy(buf, dfu_file_buf + offset, *len);

 	return 0;
 }

 int dfu_read_medium_mmc(struct dfu_entity *dfu, u64 offset, void *buf,
 		long *len)
 {
 	int ret = -1;

 	switch (dfu->layout) {
 	case DFU_RAW_ADDR:
 		ret = mmc_block_op(DFU_OP_READ, dfu, offset, buf, len);
 		break;
 	case DFU_FS_FAT:
 	case DFU_FS_EXT4:
 		ret = mmc_file_unbuffer(dfu, offset, buf, len);
 		break;
 	default:
 		printf("%s: Layout (%s) not (yet) supported!\n", __func__,
 		       dfu_get_layout(dfu->layout));
 	}

 	return ret;
 }

 void dfu_free_entity_mmc(struct dfu_entity *dfu)
 {
 	if (dfu_file_buf) {
 		free(dfu_file_buf);
 		dfu_file_buf = NULL;
 	}
 }

 /*
  * @param s Parameter string containing space-separated arguments:
  *	1st:
  *		raw	(raw read/write)
  *		fat	(files)
  *		ext4	(^)
  *		part	(partition image)
  *	2nd and 3rd:
  *		lba_start and lba_size, for raw write
  *		mmc_dev and mmc_part, for filesystems and part
  *	4th (optional):
  *		mmcpart <num> (access to HW eMMC partitions)
  */
 int dfu_fill_entity_mmc(struct dfu_entity *dfu, char *devstr, char *s)
 {
 	const char *entity_type;
 	size_t second_arg;
 	size_t third_arg;

 	struct mmc *mmc;

 	const char *argv[3];
 	const char **parg = argv;

 	dfu->data.mmc.dev_num = simple_strtoul(devstr, NULL, 10);

 	for (; parg < argv + sizeof(argv) / sizeof(*argv); ++parg) {
 		*parg = strsep(&s, " ");
 		if (*parg == NULL) {
 			pr_err("Invalid number of arguments.\n");
 			return -ENODEV;
 		}
 	}

 	entity_type = argv[0];
 	/*
 	 * Base 0 means we'll accept (prefixed with 0x or 0) base 16, 8,
 	 * with default 10.
 	 */
 	second_arg = simple_strtoul(argv[1], NULL, 0);
 	third_arg = simple_strtoul(argv[2], NULL, 0);

 	mmc = find_mmc_device(dfu->data.mmc.dev_num);
 	if (mmc == NULL) {
 		pr_err("Couldn't find MMC device no. %d.\n",
 		      dfu->data.mmc.dev_num);
 		return -ENODEV;
 	}

 	if (mmc_init(mmc)) {
 		pr_err("Couldn't init MMC device.\n");
 		return -ENODEV;
 	}

 	dfu->data.mmc.hw_partition = -EINVAL;
 	if (!strcmp(entity_type, "raw")) {
 		dfu->layout			= DFU_RAW_ADDR;
 		dfu->data.mmc.lba_start		= second_arg;
 		dfu->data.mmc.lba_size		= third_arg;
 		dfu->data.mmc.lba_blk_size	= mmc->read_bl_len;

 		/*
 		 * Check for an extra entry at dfu_alt_info env variable
 		 * specifying the mmc HW defined partition number
 		 */
 		if (s)
 			if (!strcmp(strsep(&s, " "), "mmcpart"))
 				dfu->data.mmc.hw_partition =
 					simple_strtoul(s, NULL, 0);

 	} else if (!strcmp(entity_type, "part")) {
 		disk_partition_t partinfo;
 		struct blk_desc *blk_dev = mmc_get_blk_desc(mmc);
 		int mmcdev = second_arg;
 		int mmcpart = third_arg;

 		if (part_get_info(blk_dev, mmcpart, &partinfo) != 0) {
 			pr_err("Couldn't find part #%d on mmc device #%d\n",
 			      mmcpart, mmcdev);
 			return -ENODEV;
 		}

 		dfu->layout			= DFU_RAW_ADDR;
 		dfu->data.mmc.lba_start		= partinfo.start;
 		dfu->data.mmc.lba_size		= partinfo.size;
 		dfu->data.mmc.lba_blk_size	= partinfo.blksz;
 	} else if (!strcmp(entity_type, "fat")) {
 		dfu->layout = DFU_FS_FAT;
 	} else if (!strcmp(entity_type, "ext4")) {
 		dfu->layout = DFU_FS_EXT4;
 	} else {
 		pr_err("Memory layout (%s) not supported!\n", entity_type);
 		return -ENODEV;
 	}

 	/* if it's NOT a raw write */
 	if (strcmp(entity_type, "raw")) {
 		dfu->data.mmc.dev = second_arg;
 		dfu->data.mmc.part = third_arg;
 	}

 	dfu->dev_type = DFU_DEV_MMC;
 	dfu->get_medium_size = dfu_get_medium_size_mmc;
 	dfu->read_medium = dfu_read_medium_mmc;
 	dfu->write_medium = dfu_write_medium_mmc;
 	dfu->flush_medium = dfu_flush_medium_mmc;
 	dfu->inited = 0;
 	dfu->free_entity = dfu_free_entity_mmc;

 	/* Check if file buffer is ready */
 	if (!dfu_file_buf) {
 		dfu_file_buf = memalign(CONFIG_SYS_CACHELINE_SIZE,
 					CONFIG_SYS_DFU_MAX_FILE_SIZE);
 		if (!dfu_file_buf) {
 			pr_err("Could not memalign 0x%x bytes",
 			      CONFIG_SYS_DFU_MAX_FILE_SIZE);
 			return -ENOMEM;
 		}
 	}

 	return 0;
 }
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* dfu.c -- DFU back-end routines
	*
	* Copyright (C) 2012 Samsung Electronics
	* author: Lukasz Majewski <l.majewski@samsung.com>
	*/

	#include <common.h>
	#include <malloc.h>
	#include <errno.h>
	#include <div64.h>
	#include <dfu.h>
	#include <ext4fs.h>
	#include <fat.h>
	#include <mmc.h>

	static unsigned char *dfu_file_buf;
	static u64 dfu_file_buf_len;
	static long dfu_file_buf_filled;

	static int mmc_block_op(enum dfu_op op, struct dfu_entity *dfu,
	u64 offset, void buf, long len)
	{
	struct mmc *mmc;
	u32 blk_start, blk_count, n = 0;
	int ret, part_num_bkp = 0;

	mmc = find_mmc_device(dfu->data.mmc.dev_num);
	if (!mmc) {
	pr_err("Device MMC %d - not found!", dfu->data.mmc.dev_num);
	return -ENODEV;
	}

	/*
	* We must ensure that we work in lba_blk_size chunks, so ALIGN
	* this value.
	*/
	len = ALIGN(len, dfu->data.mmc.lba_blk_size);

	blk_start = dfu->data.mmc.lba_start +
	(u32)lldiv(offset, dfu->data.mmc.lba_blk_size);
	blk_count = *len / dfu->data.mmc.lba_blk_size;
	if (blk_start + blk_count >
	dfu->data.mmc.lba_start + dfu->data.mmc.lba_size) {
	puts("Request would exceed designated area!\n");
	return -EINVAL;
	}

	if (dfu->data.mmc.hw_partition >= 0) {
	part_num_bkp = mmc_get_blk_desc(mmc)->hwpart;
	ret = blk_select_hwpart_devnum(IF_TYPE_MMC,
	dfu->data.mmc.dev_num,
	dfu->data.mmc.hw_partition);
	if (ret)
	return ret;
	}

	debug("%s: %s dev: %d start: %d cnt: %d buf: 0x%p\n", __func__,
	op == DFU_OP_READ ? "MMC READ" : "MMC WRITE",
	dfu->data.mmc.dev_num, blk_start, blk_count, buf);
	switch (op) {
	case DFU_OP_READ:
	n = blk_dread(mmc_get_blk_desc(mmc), blk_start, blk_count, buf);
	break;
	case DFU_OP_WRITE:
	n = blk_dwrite(mmc_get_blk_desc(mmc), blk_start, blk_count,
	buf);
	break;
	default:
	pr_err("Operation not supported\n");
	}

	if (n != blk_count) {
	pr_err("MMC operation failed");
	if (dfu->data.mmc.hw_partition >= 0)
	blk_select_hwpart_devnum(IF_TYPE_MMC,
	dfu->data.mmc.dev_num,
	part_num_bkp);
	return -EIO;
	}

	if (dfu->data.mmc.hw_partition >= 0) {
	ret = blk_select_hwpart_devnum(IF_TYPE_MMC,
	dfu->data.mmc.dev_num,
	part_num_bkp);
	if (ret)
	return ret;
	}

	return 0;
	}

	static int mmc_file_buffer(struct dfu_entity dfu, void buf, long *len)
	{
	if (dfu_file_buf_len + *len > CONFIG_SYS_DFU_MAX_FILE_SIZE) {
	dfu_file_buf_len = 0;
	return -EINVAL;
	}

	/* Add to the current buffer. */
	memcpy(dfu_file_buf + dfu_file_buf_len, buf, *len);
	dfu_file_buf_len += *len;

	return 0;
	}

	static int mmc_file_op(enum dfu_op op, struct dfu_entity *dfu,
	void buf, u64 len)
	{
	char dev_part_str[8];
	int ret;
	int fstype;
	loff_t size = 0;

	switch (dfu->layout) {
	case DFU_FS_FAT:
	fstype = FS_TYPE_FAT;
	break;
	case DFU_FS_EXT4:
	fstype = FS_TYPE_EXT;
	break;
	default:
	printf("%s: Layout (%s) not (yet) supported!\n", __func__,
	dfu_get_layout(dfu->layout));
	return -1;
	}

	snprintf(dev_part_str, sizeof(dev_part_str), "%d:%d",
	dfu->data.mmc.dev, dfu->data.mmc.part);

	ret = fs_set_blk_dev("mmc", dev_part_str, fstype);
	if (ret) {
	puts("dfu: fs_set_blk_dev error!\n");
	return ret;
	}

	switch (op) {
	case DFU_OP_READ:
	ret = fs_read(dfu->name, (size_t)buf, 0, 0, &size);
	if (ret) {
	puts("dfu: fs_read error!\n");
	return ret;
	}
	*len = size;
	break;
	case DFU_OP_WRITE:
	ret = fs_write(dfu->name, (size_t)buf, 0, *len, &size);
	if (ret) {
	puts("dfu: fs_write error!\n");
	return ret;
	}
	break;
	case DFU_OP_SIZE:
	ret = fs_size(dfu->name, &size);
	if (ret) {
	puts("dfu: fs_size error!\n");
	return ret;
	}
	*len = size;
	break;
	default:
	return -1;
	}

	return ret;
	}

	int dfu_write_medium_mmc(struct dfu_entity *dfu,
	u64 offset, void buf, long len)
	{
	int ret = -1;

	switch (dfu->layout) {
	case DFU_RAW_ADDR:
	ret = mmc_block_op(DFU_OP_WRITE, dfu, offset, buf, len);
	break;
	case DFU_FS_FAT:
	case DFU_FS_EXT4:
	ret = mmc_file_buffer(dfu, buf, len);
	break;
	default:
	printf("%s: Layout (%s) not (yet) supported!\n", __func__,
	dfu_get_layout(dfu->layout));
	}

	return ret;
	}

	int dfu_flush_medium_mmc(struct dfu_entity *dfu)
	{
	int ret = 0;

	if (dfu->layout != DFU_RAW_ADDR) {
	/* Do stuff here. */
	ret = mmc_file_op(DFU_OP_WRITE, dfu, dfu_file_buf,
	&dfu_file_buf_len);

	/* Now that we're done */
	dfu_file_buf_len = 0;
	}

	return ret;
	}

	int dfu_get_medium_size_mmc(struct dfu_entity dfu, u64 size)
	{
	int ret;

	switch (dfu->layout) {
	case DFU_RAW_ADDR:
	size = dfu->data.mmc.lba_size dfu->data.mmc.lba_blk_size;
	return 0;
	case DFU_FS_FAT:
	case DFU_FS_EXT4:
	dfu_file_buf_filled = -1;
	ret = mmc_file_op(DFU_OP_SIZE, dfu, NULL, size);
	if (ret < 0)
	return ret;
	if (*size > CONFIG_SYS_DFU_MAX_FILE_SIZE)
	return -1;
	return 0;
	default:
	printf("%s: Layout (%s) not (yet) supported!\n", __func__,
	dfu_get_layout(dfu->layout));
	return -1;
	}
	}

	static int mmc_file_unbuffer(struct dfu_entity dfu, u64 offset, void buf,
	long *len)
	{
	int ret;
	u64 file_len;

	if (dfu_file_buf_filled == -1) {
	ret = mmc_file_op(DFU_OP_READ, dfu, dfu_file_buf, &file_len);
	if (ret < 0)
	return ret;
	dfu_file_buf_filled = file_len;
	}
	if (offset + *len > dfu_file_buf_filled)
	return -EINVAL;

	/* Add to the current buffer. */
	memcpy(buf, dfu_file_buf + offset, *len);

	return 0;
	}

	int dfu_read_medium_mmc(struct dfu_entity dfu, u64 offset, void buf,
	long *len)
	{
	int ret = -1;

	switch (dfu->layout) {
	case DFU_RAW_ADDR:
	ret = mmc_block_op(DFU_OP_READ, dfu, offset, buf, len);
	break;
	case DFU_FS_FAT:
	case DFU_FS_EXT4:
	ret = mmc_file_unbuffer(dfu, offset, buf, len);
	break;
	default:
	printf("%s: Layout (%s) not (yet) supported!\n", __func__,
	dfu_get_layout(dfu->layout));
	}

	return ret;
	}

	void dfu_free_entity_mmc(struct dfu_entity *dfu)
	{
	if (dfu_file_buf) {
	free(dfu_file_buf);
	dfu_file_buf = NULL;
	}
	}

	/*
	* @param s Parameter string containing space-separated arguments:
	* 1st:
	* raw (raw read/write)
	* fat (files)
	* ext4 (^)
	* part (partition image)
	* 2nd and 3rd:
	* lba_start and lba_size, for raw write
	* mmc_dev and mmc_part, for filesystems and part
	* 4th (optional):
	* mmcpart <num> (access to HW eMMC partitions)
	*/
	int dfu_fill_entity_mmc(struct dfu_entity dfu, char devstr, char *s)
	{
	const char *entity_type;
	size_t second_arg;
	size_t third_arg;

	struct mmc *mmc;

	const char *argv[3];
	const char **parg = argv;

	dfu->data.mmc.dev_num = simple_strtoul(devstr, NULL, 10);

	for (; parg < argv + sizeof(argv) / sizeof(*argv); ++parg) {
	*parg = strsep(&s, " ");
	if (*parg == NULL) {
	pr_err("Invalid number of arguments.\n");
	return -ENODEV;
	}
	}

	entity_type = argv[0];
	/*
	* Base 0 means we'll accept (prefixed with 0x or 0) base 16, 8,
	* with default 10.
	*/
	second_arg = simple_strtoul(argv[1], NULL, 0);
	third_arg = simple_strtoul(argv[2], NULL, 0);

	mmc = find_mmc_device(dfu->data.mmc.dev_num);
	if (mmc == NULL) {
	pr_err("Couldn't find MMC device no. %d.\n",
	dfu->data.mmc.dev_num);
	return -ENODEV;
	}

	if (mmc_init(mmc)) {
	pr_err("Couldn't init MMC device.\n");
	return -ENODEV;
	}

	dfu->data.mmc.hw_partition = -EINVAL;
	if (!strcmp(entity_type, "raw")) {
	dfu->layout = DFU_RAW_ADDR;
	dfu->data.mmc.lba_start = second_arg;
	dfu->data.mmc.lba_size = third_arg;
	dfu->data.mmc.lba_blk_size = mmc->read_bl_len;

	/*
	* Check for an extra entry at dfu_alt_info env variable
	* specifying the mmc HW defined partition number
	*/
	if (s)
	if (!strcmp(strsep(&s, " "), "mmcpart"))
	dfu->data.mmc.hw_partition =
	simple_strtoul(s, NULL, 0);

	} else if (!strcmp(entity_type, "part")) {
	disk_partition_t partinfo;
	struct blk_desc *blk_dev = mmc_get_blk_desc(mmc);
	int mmcdev = second_arg;
	int mmcpart = third_arg;

	if (part_get_info(blk_dev, mmcpart, &partinfo) != 0) {
	pr_err("Couldn't find part #%d on mmc device #%d\n",
	mmcpart, mmcdev);
	return -ENODEV;
	}

	dfu->layout = DFU_RAW_ADDR;
	dfu->data.mmc.lba_start = partinfo.start;
	dfu->data.mmc.lba_size = partinfo.size;
	dfu->data.mmc.lba_blk_size = partinfo.blksz;
	} else if (!strcmp(entity_type, "fat")) {
	dfu->layout = DFU_FS_FAT;
	} else if (!strcmp(entity_type, "ext4")) {
	dfu->layout = DFU_FS_EXT4;
	} else {
	pr_err("Memory layout (%s) not supported!\n", entity_type);
	return -ENODEV;
	}

	/* if it's NOT a raw write */
	if (strcmp(entity_type, "raw")) {
	dfu->data.mmc.dev = second_arg;
	dfu->data.mmc.part = third_arg;
	}

	dfu->dev_type = DFU_DEV_MMC;
	dfu->get_medium_size = dfu_get_medium_size_mmc;
	dfu->read_medium = dfu_read_medium_mmc;
	dfu->write_medium = dfu_write_medium_mmc;
	dfu->flush_medium = dfu_flush_medium_mmc;
	dfu->inited = 0;
	dfu->free_entity = dfu_free_entity_mmc;

	/* Check if file buffer is ready */
	if (!dfu_file_buf) {
	dfu_file_buf = memalign(CONFIG_SYS_CACHELINE_SIZE,
	CONFIG_SYS_DFU_MAX_FILE_SIZE);
	if (!dfu_file_buf) {
	pr_err("Could not memalign 0x%x bytes",
	CONFIG_SYS_DFU_MAX_FILE_SIZE);
	return -ENOMEM;
	}
	}

	return 0;
	}