include/fwu.h - filogic/uboot - Gitiles

 /* SPDX-License-Identifier: GPL-2.0-or-later */
 /*
  * Copyright (c) 2022, Linaro Limited
  */

 #if !defined _FWU_H_
 #define _FWU_H_

 #include <blk.h>
 #include <efi.h>
 #include <fwu_mdata.h>
 #include <mtd.h>
 #include <u-boot/uuid.h>

 #include <linux/types.h>

 struct fwu_mdata;
 struct udevice;

 struct fwu_mdata_gpt_blk_priv {
 	struct udevice *blk_dev;
 };

 struct fwu_mtd_image_info {
 	u32 start, size;
 	int bank_num, image_num;
 	char uuidbuf[UUID_STR_LEN + 1];
 };

 struct fwu_mdata_mtd_priv {
 	struct mtd_info *mtd;
 	char pri_label[50];
 	char sec_label[50];
 	u32 pri_offset;
 	u32 sec_offset;
 	struct fwu_mtd_image_info *fwu_mtd_images;
 };

 struct fwu_data {
 	uint32_t crc32;
 	uint32_t version;
 	uint32_t active_index;
 	uint32_t previous_active_index;
 	uint32_t metadata_size;
 	uint32_t boot_index;
 	uint32_t num_banks;
 	uint32_t num_images;
 	uint8_t  bank_state[4];
 	bool     trial_state;

 	struct fwu_mdata *fwu_mdata;

 	struct fwu_image_entry fwu_images[CONFIG_FWU_NUM_IMAGES_PER_BANK];
 };

 struct fwu_mdata_ops {
 	/**
 	 * read_mdata() - Populate the asked FWU metadata copy
 	 * @dev: FWU metadata device
 	 * @mdata: Output FWU mdata read
 	 * @primary: If primary or secondary copy of metadata is to be read
 	 * @size: Size in bytes of the metadata to be read
 	 *
 	 * Return: 0 if OK, -ve on error
 	 */
 	int (*read_mdata)(struct udevice *dev, struct fwu_mdata *mdata,
 			  bool primary, uint32_t size);

 	/**
 	 * write_mdata() - Write the given FWU metadata copy
 	 * @dev: FWU metadata device
 	 * @mdata: Copy of the FWU metadata to write
 	 * @primary: If primary or secondary copy of metadata is to be written
 	 * @size: Size in bytes of the metadata to be written
 	 *
 	 * Return: 0 if OK, -ve on error
 	 */
 	int (*write_mdata)(struct udevice *dev, struct fwu_mdata *mdata,
 			   bool primary, uint32_t size);
 };

 #define FWU_IMAGE_ACCEPTED	0x1

 #define FWU_BANK_INVALID	(uint8_t)0xFF
 #define FWU_BANK_VALID		(uint8_t)0xFE
 #define FWU_BANK_ACCEPTED	(uint8_t)0xFC

 enum {
 	PRIMARY_PART = 1,
 	SECONDARY_PART,
 	BOTH_PARTS,
 };

 /*
 * GUID value defined in the FWU specification for identification
 * of the FWU metadata partition.
 */
 #define FWU_MDATA_GUID \
 	EFI_GUID(0x8a7a84a0, 0x8387, 0x40f6, 0xab, 0x41, \
 		 0xa8, 0xb9, 0xa5, 0xa6, 0x0d, 0x23)

 /*
 * GUID value defined in the Dependable Boot specification for
 * identification of the revert capsule, used for reverting
 * any image in the updated bank.
 */
 #define FWU_OS_REQUEST_FW_REVERT_GUID \
 	EFI_GUID(0xacd58b4b, 0xc0e8, 0x475f, 0x99, 0xb5, \
 		 0x6b, 0x3f, 0x7e, 0x07, 0xaa, 0xf0)

 /*
 * GUID value defined in the Dependable Boot specification for
 * identification of the accept capsule, used for accepting
 * an image in the updated bank.
 */
 #define FWU_OS_REQUEST_FW_ACCEPT_GUID \
 	EFI_GUID(0x0c996046, 0xbcc0, 0x4d04, 0x85, 0xec, \
 		 0xe1, 0xfc, 0xed, 0xf1, 0xc6, 0xf8)

 /**
  * fwu_read_mdata() - Wrapper around fwu_mdata_ops.read_mdata()
  */
 int fwu_read_mdata(struct udevice *dev, struct fwu_mdata *mdata,
 		   bool primary, uint32_t size);

 /**
  * fwu_write_mdata() - Wrapper around fwu_mdata_ops.write_mdata()
  */
 int fwu_write_mdata(struct udevice *dev, struct fwu_mdata *mdata,
 		    bool primary, uint32_t size);

 /**
  * fwu_get_mdata() - Read, verify and return the FWU metadata
  *
  * Read both the metadata copies from the storage media, verify their checksum,
  * and ascertain that both copies match. If one of the copies has gone bad,
  * restore it from the good copy.
  *
  * Return: 0 if OK, -ve on error
  */
 int fwu_get_mdata(struct fwu_mdata *mdata);

 /**
  * fwu_get_active_index() - Get active_index from the FWU metadata
  * @active_idxp: active_index value to be read
  *
  * Read the active_index field from the FWU metadata and place it in
  * the variable pointed to be the function argument.
  *
  * Return: 0 if OK, -ve on error
  *
  */
 int fwu_get_active_index(uint *active_idxp);

 /**
  * fwu_set_active_index() - Set active_index in the FWU metadata
  * @active_idx: active_index value to be set
  *
  * Update the active_index field in the FWU metadata
  *
  * Return: 0 if OK, -ve on error
  *
  */
 int fwu_set_active_index(uint active_idx);

 /**
  * fwu_get_dfu_alt_num() - Get the dfu_alt_num to be used for capsule update
  * @image_index:	The Image Index for the image
  * @alt_num:		pointer to store dfu_alt_num
  *
  * Currently, the capsule update driver uses the DFU framework for
  * the updates. This function gets the DFU alt number which is to
  * be used for capsule update.
  *
  * Return: 0 if OK, -ve on error
  *
  */
 int fwu_get_dfu_alt_num(u8 image_index, u8 *alt_num);

 /**
  * fwu_revert_boot_index() - Revert the active index in the FWU metadata
  *
  * Revert the active_index value in the FWU metadata, by swapping the values
  * of active_index and previous_active_index in both copies of the
  * FWU metadata.
  *
  * Return: 0 if OK, -ve on error
  *
  */
 int fwu_revert_boot_index(void);

 /**
  * fwu_accept_image() - Set the Acceptance bit for the image
  * @img_type_id: GUID of the image type for which the accepted bit is to be
  *               cleared
  * @bank: Bank of which the image's Accept bit is to be set
  *
  * Set the accepted bit for the image specified by the img_guid parameter. This
  * indicates acceptance of image for subsequent boots by some governing component
  * like OS(or firmware).
  *
  * Return: 0 if OK, -ve on error
  *
  */
 int fwu_accept_image(efi_guid_t *img_type_id, u32 bank);

 /**
  * fwu_clear_accept_image() - Clear the Acceptance bit for the image
  * @img_type_id: GUID of the image type for which the accepted bit is to be
  *               cleared
  * @bank: Bank of which the image's Accept bit is to be cleared
  *
  * Clear the accepted bit for the image type specified by the img_type_id parameter.
  * This function is called after the image has been updated. The accepted bit is
  * cleared to be set subsequently after passing the image acceptance criteria, by
  * either the OS(or firmware)
  *
  * Return: 0 if OK, -ve on error
  *
  */
 int fwu_clear_accept_image(efi_guid_t *img_type_id, u32 bank);

 /**
  * fwu_plat_get_alt_num() - Get the DFU Alt Num for the image from the platform
  * @dev: FWU device
  * @image_guid: Image GUID for which DFU alt number needs to be retrieved
  * @alt_num: Pointer to the alt_num
  *
  * Get the DFU alt number from the platform for the image specified by the
  * image GUID.
  *
  * Return: 0 if OK, -ve on error
  *
  */
 int fwu_plat_get_alt_num(struct udevice *dev, efi_guid_t *image_guid,
 			 u8 *alt_num);

 /**
  * fwu_plat_get_update_index() - Get the value of the update bank
  * @update_idx: Bank number to which images are to be updated
  *
  * Get the value of the bank(partition) to which the update needs to be
  * made.
  *
  * Note: This is a weak function and platforms can override this with
  * their own implementation for selection of the update bank.
  *
  * Return: 0 if OK, -ve on error
  *
  */
 int fwu_plat_get_update_index(uint *update_idx);

 /**
  * fwu_plat_get_bootidx() - Get the value of the boot index
  * @boot_idx: Boot index value
  *
  * Get the value of the bank(partition) from which the platform
  * has booted. This value is passed to U-Boot from the earlier
  * stage bootloader which loads and boots all the relevant
  * firmware images
  *
  */
 void fwu_plat_get_bootidx(uint *boot_idx);

 /**
  * fwu_update_checks_pass() - Check if FWU update can be done
  *
  * Check if the FWU update can be executed. The updates are
  * allowed only when the platform is not in Trial State and
  * the boot time checks have passed
  *
  * Return: 1 if OK, 0 if checks do not pass
  *
  */
 u8 fwu_update_checks_pass(void);

 /**
  * fwu_empty_capsule_checks_pass() - Check if empty capsule can be processed
  *
  * Check if the empty capsule can be processed to either accept or revert
  * an earlier executed update. The empty capsules need to be processed
  * only when the platform is in Trial State and the boot time checks have
  * passed
  *
  * Return: 1 if OK, 0 if not to be allowed
  *
  */
 u8 fwu_empty_capsule_checks_pass(void);

 /**
  * fwu_trial_state_ctr_start() - Start the Trial State counter
  *
  * Start the counter to identify the platform booting in the
  * Trial State. The counter is implemented as an EFI variable.
  *
  * Return: 0 if OK, -ve on error
  *
  */
 int fwu_trial_state_ctr_start(void);

 /**
  * fwu_gen_alt_info_from_mtd() - Parse dfu_alt_info from metadata in mtd
  * @buf: Buffer into which the dfu_alt_info is filled
  * @len: Maximum characters that can be written in buf
  * @mtd: Pointer to underlying MTD device
  *
  * Parse dfu_alt_info from metadata in mtd. Used for setting the env.
  *
  * Return: 0 if OK, -ve on error
  */
 int fwu_gen_alt_info_from_mtd(char *buf, size_t len, struct mtd_info *mtd);

 /**
  * fwu_mtd_get_alt_num() - Mapping of fwu_plat_get_alt_num for MTD device
  * @image_guid: Image GUID for which DFU alt number needs to be retrieved
  * @alt_num: Pointer to the alt_num
  * @mtd_dev: Name of mtd device instance
  *
  * To map fwu_plat_get_alt_num onto mtd based metadata implementation.
  *
  * Return: 0 if OK, -ve on error
  */
 int fwu_mtd_get_alt_num(efi_guid_t *image_guid, u8 *alt_num, const char *mtd_dev);

 /**
  * fwu_mdata_copies_allocate() - Allocate memory for metadata
  * @mdata_size: Size of the metadata structure
  *
  * Allocate memory for storing both the copies of the FWU metadata. The
  * copies are then used as a cache for storing FWU metadata contents.
  *
  * Return: 0 if OK, -ve on error
  */
 int fwu_mdata_copies_allocate(u32 mdata_size);

 /**
  * fwu_get_dev() - Return the FWU metadata device
  *
  * Return the pointer to the FWU metadata device.
  *
  * Return: Pointer to the FWU metadata dev
  */
 struct udevice *fwu_get_dev(void);

 /**
  * fwu_get_data() - Return the version agnostic FWU structure
  *
  * Return the pointer to the version agnostic FWU structure.
  *
  * Return: Pointer to the FWU data structure
  */
 struct fwu_data *fwu_get_data(void);

 /**
  * fwu_sync_mdata() - Update given meta-data partition(s) with the copy provided
  * @data: FWU Data structure
  * @part: Bitmask of FWU metadata partitions to be written to
  *
  * Return: 0 if OK, -ve on error
  */
 int fwu_sync_mdata(struct fwu_mdata *mdata, int part);

 /**
  * fwu_populate_mdata_image_info() - Populate the image information
  * of the metadata
  * @data: Version agnostic FWU metadata information
  *
  * Populate the image information in the FWU metadata by copying it
  * from the version agnostic structure. This is done before the
  * metadata gets written to the storage media.
  *
  * Return: None
  */
 void fwu_populate_mdata_image_info(struct fwu_data *data);

 /**
  * fwu_get_mdata_size() - Get the FWU metadata size
  * @mdata_size: Size of the metadata structure
  *
  * Get the size of the FWU metadata from the structure. This is later used
  * to allocate memory for the structure.
  *
  * Return: 0 if OK, -ve on error
  */
 int fwu_get_mdata_size(uint32_t *mdata_size);

 /**
  * fwu_state_machine_updates() - Update FWU state of the platform
  * @trial_state: Is platform transitioning into Trial State
  * @update_index: Bank number to which images have been updated
  *
  * On successful completion of updates, transition the platform to
  * either Trial State or Regular State.
  *
  * To transition the platform to Trial State, start the
  * TrialStateCtr counter, followed by setting the value of bank_state
  * field of the metadata to Valid state(applicable only in version 2
  * of metadata).
  *
  * In case, the platform is to transition directly to Regular State,
  * update the bank_state field of the metadata to Accepted
  * state(applicable only in version 2 of metadata).
  *
  * Return: 0 if OK, -ve on error
  */
 int fwu_state_machine_updates(bool trial_state, uint32_t update_index);

 /**
  * fwu_init() - FWU specific initialisations
  *
  * Carry out some FWU specific initialisations including allocation
  * of memory for the metadata copies, and reading the FWU metadata
  * copies into the allocated memory. The metadata fields are then
  * copied into a version agnostic structure.
  *
  * Return: 0 if OK, -ve on error
  */
 int fwu_init(void);

 #endif /* _FWU_H_ */
	/* SPDX-License-Identifier: GPL-2.0-or-later */
	/*
	* Copyright (c) 2022, Linaro Limited
	*/

	#if !defined _FWU_H_
	#define _FWU_H_

	#include <blk.h>
	#include <efi.h>
	#include <fwu_mdata.h>
	#include <mtd.h>
	#include <u-boot/uuid.h>

	#include <linux/types.h>

	struct fwu_mdata;
	struct udevice;

	struct fwu_mdata_gpt_blk_priv {
	struct udevice *blk_dev;
	};

	struct fwu_mtd_image_info {
	u32 start, size;
	int bank_num, image_num;
	char uuidbuf[UUID_STR_LEN + 1];
	};

	struct fwu_mdata_mtd_priv {
	struct mtd_info *mtd;
	char pri_label[50];
	char sec_label[50];
	u32 pri_offset;
	u32 sec_offset;
	struct fwu_mtd_image_info *fwu_mtd_images;
	};

	struct fwu_data {
	uint32_t crc32;
	uint32_t version;
	uint32_t active_index;
	uint32_t previous_active_index;
	uint32_t metadata_size;
	uint32_t boot_index;
	uint32_t num_banks;
	uint32_t num_images;
	uint8_t bank_state[4];
	bool trial_state;

	struct fwu_mdata *fwu_mdata;

	struct fwu_image_entry fwu_images[CONFIG_FWU_NUM_IMAGES_PER_BANK];
	};

	struct fwu_mdata_ops {
	/**
	* read_mdata() - Populate the asked FWU metadata copy
	* @dev: FWU metadata device
	* @mdata: Output FWU mdata read
	* @primary: If primary or secondary copy of metadata is to be read
	* @size: Size in bytes of the metadata to be read
	*
	* Return: 0 if OK, -ve on error
	*/
	int (read_mdata)(struct udevice dev, struct fwu_mdata *mdata,
	bool primary, uint32_t size);

	/**
	* write_mdata() - Write the given FWU metadata copy
	* @dev: FWU metadata device
	* @mdata: Copy of the FWU metadata to write
	* @primary: If primary or secondary copy of metadata is to be written
	* @size: Size in bytes of the metadata to be written
	*
	* Return: 0 if OK, -ve on error
	*/
	int (write_mdata)(struct udevice dev, struct fwu_mdata *mdata,
	bool primary, uint32_t size);
	};

	#define FWU_IMAGE_ACCEPTED 0x1

	#define FWU_BANK_INVALID (uint8_t)0xFF
	#define FWU_BANK_VALID (uint8_t)0xFE
	#define FWU_BANK_ACCEPTED (uint8_t)0xFC

	enum {
	PRIMARY_PART = 1,
	SECONDARY_PART,
	BOTH_PARTS,
	};

	/*
	* GUID value defined in the FWU specification for identification
	* of the FWU metadata partition.
	*/
	#define FWU_MDATA_GUID \
	EFI_GUID(0x8a7a84a0, 0x8387, 0x40f6, 0xab, 0x41, \
	0xa8, 0xb9, 0xa5, 0xa6, 0x0d, 0x23)

	/*
	* GUID value defined in the Dependable Boot specification for
	* identification of the revert capsule, used for reverting
	* any image in the updated bank.
	*/
	#define FWU_OS_REQUEST_FW_REVERT_GUID \
	EFI_GUID(0xacd58b4b, 0xc0e8, 0x475f, 0x99, 0xb5, \
	0x6b, 0x3f, 0x7e, 0x07, 0xaa, 0xf0)

	/*
	* GUID value defined in the Dependable Boot specification for
	* identification of the accept capsule, used for accepting
	* an image in the updated bank.
	*/
	#define FWU_OS_REQUEST_FW_ACCEPT_GUID \
	EFI_GUID(0x0c996046, 0xbcc0, 0x4d04, 0x85, 0xec, \
	0xe1, 0xfc, 0xed, 0xf1, 0xc6, 0xf8)

	/**
	* fwu_read_mdata() - Wrapper around fwu_mdata_ops.read_mdata()
	*/
	int fwu_read_mdata(struct udevice dev, struct fwu_mdata mdata,
	bool primary, uint32_t size);

	/**
	* fwu_write_mdata() - Wrapper around fwu_mdata_ops.write_mdata()
	*/
	int fwu_write_mdata(struct udevice dev, struct fwu_mdata mdata,
	bool primary, uint32_t size);

	/**
	* fwu_get_mdata() - Read, verify and return the FWU metadata
	*
	* Read both the metadata copies from the storage media, verify their checksum,
	* and ascertain that both copies match. If one of the copies has gone bad,
	* restore it from the good copy.
	*
	* Return: 0 if OK, -ve on error
	*/
	int fwu_get_mdata(struct fwu_mdata *mdata);

	/**
	* fwu_get_active_index() - Get active_index from the FWU metadata
	* @active_idxp: active_index value to be read
	*
	* Read the active_index field from the FWU metadata and place it in
	* the variable pointed to be the function argument.
	*
	* Return: 0 if OK, -ve on error
	*
	*/
	int fwu_get_active_index(uint *active_idxp);

	/**
	* fwu_set_active_index() - Set active_index in the FWU metadata
	* @active_idx: active_index value to be set
	*
	* Update the active_index field in the FWU metadata
	*
	* Return: 0 if OK, -ve on error
	*
	*/
	int fwu_set_active_index(uint active_idx);

	/**
	* fwu_get_dfu_alt_num() - Get the dfu_alt_num to be used for capsule update
	* @image_index: The Image Index for the image
	* @alt_num: pointer to store dfu_alt_num
	*
	* Currently, the capsule update driver uses the DFU framework for
	* the updates. This function gets the DFU alt number which is to
	* be used for capsule update.
	*
	* Return: 0 if OK, -ve on error
	*
	*/
	int fwu_get_dfu_alt_num(u8 image_index, u8 *alt_num);

	/**
	* fwu_revert_boot_index() - Revert the active index in the FWU metadata
	*
	* Revert the active_index value in the FWU metadata, by swapping the values
	* of active_index and previous_active_index in both copies of the
	* FWU metadata.
	*
	* Return: 0 if OK, -ve on error
	*
	*/
	int fwu_revert_boot_index(void);

	/**
	* fwu_accept_image() - Set the Acceptance bit for the image
	* @img_type_id: GUID of the image type for which the accepted bit is to be
	* cleared
	* @bank: Bank of which the image's Accept bit is to be set
	*
	* Set the accepted bit for the image specified by the img_guid parameter. This
	* indicates acceptance of image for subsequent boots by some governing component
	* like OS(or firmware).
	*
	* Return: 0 if OK, -ve on error
	*
	*/
	int fwu_accept_image(efi_guid_t *img_type_id, u32 bank);

	/**
	* fwu_clear_accept_image() - Clear the Acceptance bit for the image
	* @img_type_id: GUID of the image type for which the accepted bit is to be
	* cleared
	* @bank: Bank of which the image's Accept bit is to be cleared
	*
	* Clear the accepted bit for the image type specified by the img_type_id parameter.
	* This function is called after the image has been updated. The accepted bit is
	* cleared to be set subsequently after passing the image acceptance criteria, by
	* either the OS(or firmware)
	*
	* Return: 0 if OK, -ve on error
	*
	*/
	int fwu_clear_accept_image(efi_guid_t *img_type_id, u32 bank);

	/**
	* fwu_plat_get_alt_num() - Get the DFU Alt Num for the image from the platform
	* @dev: FWU device
	* @image_guid: Image GUID for which DFU alt number needs to be retrieved
	* @alt_num: Pointer to the alt_num
	*
	* Get the DFU alt number from the platform for the image specified by the
	* image GUID.
	*
	* Return: 0 if OK, -ve on error
	*
	*/
	int fwu_plat_get_alt_num(struct udevice dev, efi_guid_t image_guid,
	u8 *alt_num);

	/**
	* fwu_plat_get_update_index() - Get the value of the update bank
	* @update_idx: Bank number to which images are to be updated
	*
	* Get the value of the bank(partition) to which the update needs to be
	* made.
	*
	* Note: This is a weak function and platforms can override this with
	* their own implementation for selection of the update bank.
	*
	* Return: 0 if OK, -ve on error
	*
	*/
	int fwu_plat_get_update_index(uint *update_idx);

	/**
	* fwu_plat_get_bootidx() - Get the value of the boot index
	* @boot_idx: Boot index value
	*
	* Get the value of the bank(partition) from which the platform
	* has booted. This value is passed to U-Boot from the earlier
	* stage bootloader which loads and boots all the relevant
	* firmware images
	*
	*/
	void fwu_plat_get_bootidx(uint *boot_idx);

	/**
	* fwu_update_checks_pass() - Check if FWU update can be done
	*
	* Check if the FWU update can be executed. The updates are
	* allowed only when the platform is not in Trial State and
	* the boot time checks have passed
	*
	* Return: 1 if OK, 0 if checks do not pass
	*
	*/
	u8 fwu_update_checks_pass(void);

	/**
	* fwu_empty_capsule_checks_pass() - Check if empty capsule can be processed
	*
	* Check if the empty capsule can be processed to either accept or revert
	* an earlier executed update. The empty capsules need to be processed
	* only when the platform is in Trial State and the boot time checks have
	* passed
	*
	* Return: 1 if OK, 0 if not to be allowed
	*
	*/
	u8 fwu_empty_capsule_checks_pass(void);

	/**
	* fwu_trial_state_ctr_start() - Start the Trial State counter
	*
	* Start the counter to identify the platform booting in the
	* Trial State. The counter is implemented as an EFI variable.
	*
	* Return: 0 if OK, -ve on error
	*
	*/
	int fwu_trial_state_ctr_start(void);

	/**
	* fwu_gen_alt_info_from_mtd() - Parse dfu_alt_info from metadata in mtd
	* @buf: Buffer into which the dfu_alt_info is filled
	* @len: Maximum characters that can be written in buf
	* @mtd: Pointer to underlying MTD device
	*
	* Parse dfu_alt_info from metadata in mtd. Used for setting the env.
	*
	* Return: 0 if OK, -ve on error
	*/
	int fwu_gen_alt_info_from_mtd(char buf, size_t len, struct mtd_info mtd);

	/**
	* fwu_mtd_get_alt_num() - Mapping of fwu_plat_get_alt_num for MTD device
	* @image_guid: Image GUID for which DFU alt number needs to be retrieved
	* @alt_num: Pointer to the alt_num
	* @mtd_dev: Name of mtd device instance
	*
	* To map fwu_plat_get_alt_num onto mtd based metadata implementation.
	*
	* Return: 0 if OK, -ve on error
	*/
	int fwu_mtd_get_alt_num(efi_guid_t image_guid, u8 alt_num, const char *mtd_dev);

	/**
	* fwu_mdata_copies_allocate() - Allocate memory for metadata
	* @mdata_size: Size of the metadata structure
	*
	* Allocate memory for storing both the copies of the FWU metadata. The
	* copies are then used as a cache for storing FWU metadata contents.
	*
	* Return: 0 if OK, -ve on error
	*/
	int fwu_mdata_copies_allocate(u32 mdata_size);

	/**
	* fwu_get_dev() - Return the FWU metadata device
	*
	* Return the pointer to the FWU metadata device.
	*
	* Return: Pointer to the FWU metadata dev
	*/
	struct udevice *fwu_get_dev(void);

	/**
	* fwu_get_data() - Return the version agnostic FWU structure
	*
	* Return the pointer to the version agnostic FWU structure.
	*
	* Return: Pointer to the FWU data structure
	*/
	struct fwu_data *fwu_get_data(void);

	/**
	* fwu_sync_mdata() - Update given meta-data partition(s) with the copy provided
	* @data: FWU Data structure
	* @part: Bitmask of FWU metadata partitions to be written to
	*
	* Return: 0 if OK, -ve on error
	*/
	int fwu_sync_mdata(struct fwu_mdata *mdata, int part);

	/**
	* fwu_populate_mdata_image_info() - Populate the image information
	* of the metadata
	* @data: Version agnostic FWU metadata information
	*
	* Populate the image information in the FWU metadata by copying it
	* from the version agnostic structure. This is done before the
	* metadata gets written to the storage media.
	*
	* Return: None
	*/
	void fwu_populate_mdata_image_info(struct fwu_data *data);

	/**
	* fwu_get_mdata_size() - Get the FWU metadata size
	* @mdata_size: Size of the metadata structure
	*
	* Get the size of the FWU metadata from the structure. This is later used
	* to allocate memory for the structure.
	*
	* Return: 0 if OK, -ve on error
	*/
	int fwu_get_mdata_size(uint32_t *mdata_size);

	/**
	* fwu_state_machine_updates() - Update FWU state of the platform
	* @trial_state: Is platform transitioning into Trial State
	* @update_index: Bank number to which images have been updated
	*
	* On successful completion of updates, transition the platform to
	* either Trial State or Regular State.
	*
	* To transition the platform to Trial State, start the
	* TrialStateCtr counter, followed by setting the value of bank_state
	* field of the metadata to Valid state(applicable only in version 2
	* of metadata).
	*
	* In case, the platform is to transition directly to Regular State,
	* update the bank_state field of the metadata to Accepted
	* state(applicable only in version 2 of metadata).
	*
	* Return: 0 if OK, -ve on error
	*/
	int fwu_state_machine_updates(bool trial_state, uint32_t update_index);

	/**
	* fwu_init() - FWU specific initialisations
	*
	* Carry out some FWU specific initialisations including allocation
	* of memory for the metadata copies, and reading the FWU metadata
	* copies into the allocated memory. The metadata fields are then
	* copied into a version agnostic structure.
	*
	* Return: 0 if OK, -ve on error
	*/
	int fwu_init(void);

	#endif /* _FWU_H_ */