include/tpm-v2.h

/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Defines APIs and structures that allow software to interact with a
 * TPM2 device
 *
 * Copyright (c) 2020 Linaro
 * Copyright (c) 2018 Bootlin
 *
 * https://trustedcomputinggroup.org/resource/tss-overview-common-structures-specification/
 *
 * Author: Miquel Raynal <miquel.raynal@bootlin.com>
 */

#ifndef __TPM_V2_H
#define __TPM_V2_H

#include <tpm-common.h>

struct udevice;

#define TPM2_DIGEST_LEN		32

#define TPM2_SHA1_DIGEST_SIZE 20
#define TPM2_SHA256_DIGEST_SIZE	32
#define TPM2_SHA384_DIGEST_SIZE	48
#define TPM2_SHA512_DIGEST_SIZE	64
#define TPM2_SM3_256_DIGEST_SIZE 32

#define TPM2_MAX_PCRS 32
#define TPM2_PCR_SELECT_MAX ((TPM2_MAX_PCRS + 7) / 8)
#define TPM2_MAX_CAP_BUFFER 1024
#define TPM2_MAX_TPM_PROPERTIES ((TPM2_MAX_CAP_BUFFER - sizeof(u32) /* TPM2_CAP */ - \
				 sizeof(u32)) / sizeof(struct tpms_tagged_property))

#define TPM2_HDR_LEN		10

/*
 *  We deviate from this draft of the specification by increasing the value of
 *  TPM2_NUM_PCR_BANKS from 3 to 16 to ensure compatibility with TPM2
 *  implementations that have enabled a larger than typical number of PCR
 *  banks. This larger value for TPM2_NUM_PCR_BANKS is expected to be included
 *  in a future revision of the specification.
 */
#define TPM2_NUM_PCR_BANKS 16

/* Definition of (UINT32) TPM2_CAP Constants */
#define TPM2_CAP_PCRS 0x00000005U
#define TPM2_CAP_TPM_PROPERTIES 0x00000006U

/* Definition of (UINT32) TPM2_PT Constants */
#define TPM2_PT_GROUP			(u32)(0x00000100)
#define TPM2_PT_FIXED			(u32)(TPM2_PT_GROUP * 1)
#define TPM2_PT_MANUFACTURER		(u32)(TPM2_PT_FIXED + 5)
#define TPM2_PT_PCR_COUNT		(u32)(TPM2_PT_FIXED + 18)
#define TPM2_PT_MAX_COMMAND_SIZE	(u32)(TPM2_PT_FIXED + 30)
#define TPM2_PT_MAX_RESPONSE_SIZE	(u32)(TPM2_PT_FIXED + 31)

/* TPMS_TAGGED_PROPERTY Structure */
struct tpms_tagged_property {
	u32 property;
	u32 value;
} __packed;

/* TPMS_PCR_SELECTION Structure */
struct tpms_pcr_selection {
	u16 hash;
	u8 size_of_select;
	u8 pcr_select[TPM2_PCR_SELECT_MAX];
} __packed;

/* TPML_PCR_SELECTION Structure */
struct tpml_pcr_selection {
	u32 count;
	struct tpms_pcr_selection selection[TPM2_NUM_PCR_BANKS];
} __packed;

/* TPML_TAGGED_TPM_PROPERTY Structure */
struct tpml_tagged_tpm_property {
	u32 count;
	struct tpms_tagged_property tpm_property[TPM2_MAX_TPM_PROPERTIES];
} __packed;

/* TPMU_CAPABILITIES Union */
union tpmu_capabilities {
	/*
	 * Non exhaustive. Only added the structs needed for our
	 * current code
	 */
	struct tpml_pcr_selection assigned_pcr;
	struct tpml_tagged_tpm_property tpm_properties;
} __packed;

/* TPMS_CAPABILITY_DATA Structure */
struct tpms_capability_data {
	u32 capability;
	union tpmu_capabilities data;
} __packed;

/**
 * Definition of TPMU_HA Union
 */
union tpmu_ha {
	u8 sha1[TPM2_SHA1_DIGEST_SIZE];
	u8 sha256[TPM2_SHA256_DIGEST_SIZE];
	u8 sm3_256[TPM2_SM3_256_DIGEST_SIZE];
	u8 sha384[TPM2_SHA384_DIGEST_SIZE];
	u8 sha512[TPM2_SHA512_DIGEST_SIZE];
} __packed;

/**
 * Definition of TPMT_HA Structure
 *
 * @hash_alg:	Hash algorithm defined in enum tpm2_algorithms
 * @digest:	Digest value for a given algorithm
 */
struct tpmt_ha {
	u16 hash_alg;
	union tpmu_ha digest;
} __packed;

/**
 * Definition of TPML_DIGEST_VALUES Structure
 *
 * @count:	Number of algorithms supported by hardware
 * @digests:	struct for algorithm id and hash value
 */
struct tpml_digest_values {
	u32 count;
	struct tpmt_ha digests[TPM2_NUM_PCR_BANKS];
} __packed;

/**
 * TPM2 Structure Tags for command/response buffers.
 *
 * @TPM2_ST_NO_SESSIONS: the command does not need an authentication.
 * @TPM2_ST_SESSIONS: the command needs an authentication.
 */
enum tpm2_structures {
	TPM2_ST_NO_SESSIONS	= 0x8001,
	TPM2_ST_SESSIONS	= 0x8002,
};

/**
 * TPM2 type of boolean.
 */
enum tpm2_yes_no {
	TPMI_YES		= 1,
	TPMI_NO			= 0,
};

/**
 * TPM2 startup values.
 *
 * @TPM2_SU_CLEAR: reset the internal state.
 * @TPM2_SU_STATE: restore saved state (if any).
 */
enum tpm2_startup_types {
	TPM2_SU_CLEAR		= 0x0000,
	TPM2_SU_STATE		= 0x0001,
};

/**
 * TPM2 permanent handles.
 *
 * @TPM2_RH_OWNER: refers to the 'owner' hierarchy.
 * @TPM2_RS_PW: indicates a password.
 * @TPM2_RH_LOCKOUT: refers to the 'lockout' hierarchy.
 * @TPM2_RH_ENDORSEMENT: refers to the 'endorsement' hierarchy.
 * @TPM2_RH_PLATFORM: refers to the 'platform' hierarchy.
 */
enum tpm2_handles {
	TPM2_RH_OWNER		= 0x40000001,
	TPM2_RS_PW		= 0x40000009,
	TPM2_RH_LOCKOUT		= 0x4000000A,
	TPM2_RH_ENDORSEMENT	= 0x4000000B,
	TPM2_RH_PLATFORM	= 0x4000000C,
};

/**
 * TPM2 command codes used at the beginning of a buffer, gives the command.
 *
 * @TPM2_CC_STARTUP: TPM2_Startup().
 * @TPM2_CC_SELF_TEST: TPM2_SelfTest().
 * @TPM2_CC_CLEAR: TPM2_Clear().
 * @TPM2_CC_CLEARCONTROL: TPM2_ClearControl().
 * @TPM2_CC_HIERCHANGEAUTH: TPM2_HierarchyChangeAuth().
 * @TPM2_CC_PCR_SETAUTHPOL: TPM2_PCR_SetAuthPolicy().
 * @TPM2_CC_DAM_RESET: TPM2_DictionaryAttackLockReset().
 * @TPM2_CC_DAM_PARAMETERS: TPM2_DictionaryAttackParameters().
 * @TPM2_CC_GET_CAPABILITY: TPM2_GetCapibility().
 * @TPM2_CC_GET_RANDOM: TPM2_GetRandom().
 * @TPM2_CC_PCR_READ: TPM2_PCR_Read().
 * @TPM2_CC_PCR_EXTEND: TPM2_PCR_Extend().
 * @TPM2_CC_PCR_SETAUTHVAL: TPM2_PCR_SetAuthValue().
 */
enum tpm2_command_codes {
	TPM2_CC_STARTUP		= 0x0144,
	TPM2_CC_SELF_TEST	= 0x0143,
	TPM2_CC_HIER_CONTROL	= 0x0121,
	TPM2_CC_CLEAR		= 0x0126,
	TPM2_CC_CLEARCONTROL	= 0x0127,
	TPM2_CC_HIERCHANGEAUTH	= 0x0129,
	TPM2_CC_NV_DEFINE_SPACE	= 0x012a,
	TPM2_CC_PCR_SETAUTHPOL	= 0x012C,
	TPM2_CC_NV_WRITE	= 0x0137,
	TPM2_CC_NV_WRITELOCK	= 0x0138,
	TPM2_CC_DAM_RESET	= 0x0139,
	TPM2_CC_DAM_PARAMETERS	= 0x013A,
	TPM2_CC_NV_READ         = 0x014E,
	TPM2_CC_GET_CAPABILITY	= 0x017A,
	TPM2_CC_GET_RANDOM      = 0x017B,
	TPM2_CC_PCR_READ	= 0x017E,
	TPM2_CC_PCR_EXTEND	= 0x0182,
	TPM2_CC_PCR_SETAUTHVAL	= 0x0183,
};

/**
 * TPM2 return codes.
 */
enum tpm2_return_codes {
	TPM2_RC_SUCCESS		= 0x0000,
	TPM2_RC_BAD_TAG		= 0x001E,
	TPM2_RC_FMT1		= 0x0080,
	TPM2_RC_HASH		= TPM2_RC_FMT1 + 0x0003,
	TPM2_RC_VALUE		= TPM2_RC_FMT1 + 0x0004,
	TPM2_RC_SIZE		= TPM2_RC_FMT1 + 0x0015,
	TPM2_RC_BAD_AUTH	= TPM2_RC_FMT1 + 0x0022,
	TPM2_RC_HANDLE		= TPM2_RC_FMT1 + 0x000B,
	TPM2_RC_VER1		= 0x0100,
	TPM2_RC_INITIALIZE	= TPM2_RC_VER1 + 0x0000,
	TPM2_RC_FAILURE		= TPM2_RC_VER1 + 0x0001,
	TPM2_RC_DISABLED	= TPM2_RC_VER1 + 0x0020,
	TPM2_RC_AUTH_MISSING	= TPM2_RC_VER1 + 0x0025,
	TPM2_RC_COMMAND_CODE	= TPM2_RC_VER1 + 0x0043,
	TPM2_RC_AUTHSIZE	= TPM2_RC_VER1 + 0x0044,
	TPM2_RC_AUTH_CONTEXT	= TPM2_RC_VER1 + 0x0045,
	TPM2_RC_NV_DEFINED	= TPM2_RC_VER1 + 0x004c,
	TPM2_RC_NEEDS_TEST	= TPM2_RC_VER1 + 0x0053,
	TPM2_RC_WARN		= 0x0900,
	TPM2_RC_TESTING		= TPM2_RC_WARN + 0x000A,
	TPM2_RC_REFERENCE_H0	= TPM2_RC_WARN + 0x0010,
	TPM2_RC_LOCKOUT		= TPM2_RC_WARN + 0x0021,
};

/**
 * TPM2 algorithms.
 */
enum tpm2_algorithms {
	TPM2_ALG_SHA1		= 0x04,
	TPM2_ALG_XOR		= 0x0A,
	TPM2_ALG_SHA256		= 0x0B,
	TPM2_ALG_SHA384		= 0x0C,
	TPM2_ALG_SHA512		= 0x0D,
	TPM2_ALG_NULL		= 0x10,
	TPM2_ALG_SM3_256	= 0x12,
};

/**
 * struct digest_info - details of supported digests
 *
 * @hash_name:			hash name
 * @hash_alg:			hash algorithm id
 * @hash_mask:			hash registry mask
 * @hash_len:			hash digest length
 */
struct digest_info {
	const char *hash_name;
	u16 hash_alg;
	u32 hash_mask;
	u16 hash_len;
	bool supported;
};

/* Algorithm Registry */
#define TCG2_BOOT_HASH_ALG_SHA1    0x00000001
#define TCG2_BOOT_HASH_ALG_SHA256  0x00000002
#define TCG2_BOOT_HASH_ALG_SHA384  0x00000004
#define TCG2_BOOT_HASH_ALG_SHA512  0x00000008
#define TCG2_BOOT_HASH_ALG_SM3_256 0x00000010

static const struct digest_info hash_algo_list[] = {
	{
		"sha1",
		TPM2_ALG_SHA1,
		TCG2_BOOT_HASH_ALG_SHA1,
		TPM2_SHA1_DIGEST_SIZE,
#if IS_ENABLED(CONFIG_SHA1)
		true,
#else
		false,
#endif
	},
	{
		"sha256",
		TPM2_ALG_SHA256,
		TCG2_BOOT_HASH_ALG_SHA256,
		TPM2_SHA256_DIGEST_SIZE,
#if IS_ENABLED(CONFIG_SHA256)
		true,
#else
		false,
#endif
	},
	{
		"sha384",
		TPM2_ALG_SHA384,
		TCG2_BOOT_HASH_ALG_SHA384,
		TPM2_SHA384_DIGEST_SIZE,
#if IS_ENABLED(CONFIG_SHA384)
		true,
#else
		false,
#endif
	},
	{
		"sha512",
		TPM2_ALG_SHA512,
		TCG2_BOOT_HASH_ALG_SHA512,
		TPM2_SHA512_DIGEST_SIZE,
#if IS_ENABLED(CONFIG_SHA512)
		true,
#else
		false,
#endif
	},
};

/* NV index attributes */
enum tpm_index_attrs {
	TPMA_NV_PPWRITE		= 1UL << 0,
	TPMA_NV_OWNERWRITE	= 1UL << 1,
	TPMA_NV_AUTHWRITE	= 1UL << 2,
	TPMA_NV_POLICYWRITE	= 1UL << 3,
	TPMA_NV_COUNTER		= 1UL << 4,
	TPMA_NV_BITS		= 1UL << 5,
	TPMA_NV_EXTEND		= 1UL << 6,
	TPMA_NV_POLICY_DELETE	= 1UL << 10,
	TPMA_NV_WRITELOCKED	= 1UL << 11,
	TPMA_NV_WRITEALL	= 1UL << 12,
	TPMA_NV_WRITEDEFINE	= 1UL << 13,
	TPMA_NV_WRITE_STCLEAR	= 1UL << 14,
	TPMA_NV_GLOBALLOCK	= 1UL << 15,
	TPMA_NV_PPREAD		= 1UL << 16,
	TPMA_NV_OWNERREAD	= 1UL << 17,
	TPMA_NV_AUTHREAD	= 1UL << 18,
	TPMA_NV_POLICYREAD	= 1UL << 19,
	TPMA_NV_NO_DA		= 1UL << 25,
	TPMA_NV_ORDERLY		= 1UL << 26,
	TPMA_NV_CLEAR_STCLEAR	= 1UL << 27,
	TPMA_NV_READLOCKED	= 1UL << 28,
	TPMA_NV_WRITTEN		= 1UL << 29,
	TPMA_NV_PLATFORMCREATE	= 1UL << 30,
	TPMA_NV_READ_STCLEAR	= 1UL << 31,

	TPMA_NV_MASK_READ	= TPMA_NV_PPREAD | TPMA_NV_OWNERREAD |
				TPMA_NV_AUTHREAD | TPMA_NV_POLICYREAD,
	TPMA_NV_MASK_WRITE	= TPMA_NV_PPWRITE | TPMA_NV_OWNERWRITE |
					TPMA_NV_AUTHWRITE | TPMA_NV_POLICYWRITE,
};

enum {
	TPM_ACCESS_VALID		= 1 << 7,
	TPM_ACCESS_ACTIVE_LOCALITY	= 1 << 5,
	TPM_ACCESS_REQUEST_PENDING	= 1 << 2,
	TPM_ACCESS_REQUEST_USE		= 1 << 1,
	TPM_ACCESS_ESTABLISHMENT	= 1 << 0,
};

enum {
	TPM_STS_FAMILY_SHIFT		= 26,
	TPM_STS_FAMILY_MASK		= 0x3 << TPM_STS_FAMILY_SHIFT,
	TPM_STS_FAMILY_TPM2		= 1 << TPM_STS_FAMILY_SHIFT,
	TPM_STS_RESE_TESTABLISMENT_BIT	= 1 << 25,
	TPM_STS_COMMAND_CANCEL		= 1 << 24,
	TPM_STS_BURST_COUNT_SHIFT	= 8,
	TPM_STS_BURST_COUNT_MASK	= 0xffff << TPM_STS_BURST_COUNT_SHIFT,
	TPM_STS_VALID			= 1 << 7,
	TPM_STS_COMMAND_READY		= 1 << 6,
	TPM_STS_GO			= 1 << 5,
	TPM_STS_DATA_AVAIL		= 1 << 4,
	TPM_STS_DATA_EXPECT		= 1 << 3,
	TPM_STS_SELF_TEST_DONE		= 1 << 2,
	TPM_STS_RESPONSE_RETRY		= 1 << 1,
	TPM_STS_READ_ZERO               = 0x23
};

enum {
	TPM_CMD_COUNT_OFFSET	= 2,
	TPM_CMD_ORDINAL_OFFSET	= 6,
	TPM_MAX_BUF_SIZE	= 1260,
};

enum {
	/* Secure storage for firmware settings */
	TPM_HT_PCR = 0,
	TPM_HT_NV_INDEX,
	TPM_HT_HMAC_SESSION,
	TPM_HT_POLICY_SESSION,

	HR_SHIFT		= 24,
	HR_PCR			= TPM_HT_PCR << HR_SHIFT,
	HR_HMAC_SESSION		= TPM_HT_HMAC_SESSION << HR_SHIFT,
	HR_POLICY_SESSION	= TPM_HT_POLICY_SESSION << HR_SHIFT,
	HR_NV_INDEX		= TPM_HT_NV_INDEX << HR_SHIFT,
};

/**
 * Issue a TPM2_Startup command.
 *
 * @dev		TPM device
 * @mode	TPM startup mode
 *
 * Return: code of the operation
 */
u32 tpm2_startup(struct udevice *dev, enum tpm2_startup_types mode);

/**
 * Issue a TPM2_SelfTest command.
 *
 * @dev		TPM device
 * @full_test	Asking to perform all tests or only the untested ones
 *
 * Return: code of the operation
 */
u32 tpm2_self_test(struct udevice *dev, enum tpm2_yes_no full_test);

/**
 * Issue a TPM2_Clear command.
 *
 * @dev		TPM device
 * @handle	Handle
 * @pw		Password
 * @pw_sz	Length of the password
 *
 * Return: code of the operation
 */
u32 tpm2_clear(struct udevice *dev, u32 handle, const char *pw,
	       const ssize_t pw_sz);

/**
 * Issue a TPM_NV_DefineSpace command
 *
 * This allows a space to be defined with given attributes and policy
 *
 * @dev			TPM device
 * @space_index		index of the area
 * @space_size		size of area in bytes
 * @nv_attributes	TPM_NV_ATTRIBUTES of the area
 * @nv_policy		policy to use
 * @nv_policy_size	size of the policy
 * Return: return code of the operation
 */
u32 tpm2_nv_define_space(struct udevice *dev, u32 space_index,
			 size_t space_size, u32 nv_attributes,
			 const u8 *nv_policy, size_t nv_policy_size);

/**
 * Issue a TPM2_PCR_Extend command.
 *
 * @dev		TPM device
 * @index	Index of the PCR
 * @algorithm	Algorithm used, defined in 'enum tpm2_algorithms'
 * @digest	Value representing the event to be recorded
 * @digest_len  len of the hash
 *
 * Return: code of the operation
 */
u32 tpm2_pcr_extend(struct udevice *dev, u32 index, u32 algorithm,
		    const u8 *digest, u32 digest_len);

/**
 * Read data from the secure storage
 *
 * @dev		TPM device
 * @index	Index of data to read
 * @data	Place to put data
 * @count	Number of bytes of data
 * Return: code of the operation
 */
u32 tpm2_nv_read_value(struct udevice *dev, u32 index, void *data, u32 count);

/**
 * Write data to the secure storage
 *
 * @dev		TPM device
 * @index	Index of data to write
 * @data	Data to write
 * @count	Number of bytes of data
 * Return: code of the operation
 */
u32 tpm2_nv_write_value(struct udevice *dev, u32 index, const void *data,
			u32 count);

/**
 * Issue a TPM2_PCR_Read command.
 *
 * @dev		TPM device
 * @idx		Index of the PCR
 * @idx_min_sz	Minimum size in bytes of the pcrSelect array
 * @algorithm	Algorithm used, defined in 'enum tpm2_algorithms'
 * @data	Output buffer for contents of the named PCR
 * @digest_len  len of the data
 * @updates	Optional out parameter: number of updates for this PCR
 *
 * Return: code of the operation
 */
u32 tpm2_pcr_read(struct udevice *dev, u32 idx, unsigned int idx_min_sz,
		  u16 algorithm, void *data, u32 digest_len,
		  unsigned int *updates);

/**
 * Issue a TPM2_GetCapability command.  This implementation is limited
 * to query property index that is 4-byte wide.
 *
 * @dev		TPM device
 * @capability	Partition of capabilities
 * @property	Further definition of capability, limited to be 4 bytes wide
 * @buf		Output buffer for capability information
 * @prop_count	Size of output buffer
 *
 * Return: code of the operation
 */
u32 tpm2_get_capability(struct udevice *dev, u32 capability, u32 property,
			void *buf, size_t prop_count);

/**
 * tpm2_get_pcr_info() - get the supported, active PCRs and number of banks
 *
 * @dev:		TPM device
 * @pcrs:		struct tpml_pcr_selection of available PCRs
 *
 * @return 0 on success, code of operation or negative errno on failure
 */
int tpm2_get_pcr_info(struct udevice *dev, struct tpml_pcr_selection *pcrs);

/**
 * Issue a TPM2_DictionaryAttackLockReset command.
 *
 * @dev		TPM device
 * @pw		Password
 * @pw_sz	Length of the password
 *
 * Return: code of the operation
 */
u32 tpm2_dam_reset(struct udevice *dev, const char *pw, const ssize_t pw_sz);

/**
 * Issue a TPM2_DictionaryAttackParameters command.
 *
 * @dev		TPM device
 * @pw		Password
 * @pw_sz	Length of the password
 * @max_tries	Count of authorizations before lockout
 * @recovery_time Time before decrementation of the failure count
 * @lockout_recovery Time to wait after a lockout
 *
 * Return: code of the operation
 */
u32 tpm2_dam_parameters(struct udevice *dev, const char *pw,
			const ssize_t pw_sz, unsigned int max_tries,
			unsigned int recovery_time,
			unsigned int lockout_recovery);

/**
 * Issue a TPM2_HierarchyChangeAuth command.
 *
 * @dev		TPM device
 * @handle	Handle
 * @newpw	New password
 * @newpw_sz	Length of the new password
 * @oldpw	Old password
 * @oldpw_sz	Length of the old password
 *
 * Return: code of the operation
 */
int tpm2_change_auth(struct udevice *dev, u32 handle, const char *newpw,
		     const ssize_t newpw_sz, const char *oldpw,
		     const ssize_t oldpw_sz);

/**
 * Issue a TPM_PCR_SetAuthPolicy command.
 *
 * @dev		TPM device
 * @pw		Platform password
 * @pw_sz	Length of the password
 * @index	Index of the PCR
 * @digest	New key to access the PCR
 *
 * Return: code of the operation
 */
u32 tpm2_pcr_setauthpolicy(struct udevice *dev, const char *pw,
			   const ssize_t pw_sz, u32 index, const char *key);

/**
 * Issue a TPM_PCR_SetAuthValue command.
 *
 * @dev		TPM device
 * @pw		Platform password
 * @pw_sz	Length of the password
 * @index	Index of the PCR
 * @digest	New key to access the PCR
 * @key_sz	Length of the new key
 *
 * Return: code of the operation
 */
u32 tpm2_pcr_setauthvalue(struct udevice *dev, const char *pw,
			  const ssize_t pw_sz, u32 index, const char *key,
			  const ssize_t key_sz);

/**
 * Issue a TPM2_GetRandom command.
 *
 * @dev		TPM device
 * @param data		output buffer for the random bytes
 * @param count		size of output buffer
 *
 * Return: return code of the operation
 */
u32 tpm2_get_random(struct udevice *dev, void *data, u32 count);

/**
 * Lock data in the TPM
 *
 * Once locked the data cannot be written until after a reboot
 *
 * @dev		TPM device
 * @index	Index of data to lock
 * Return: code of the operation
 */
u32 tpm2_write_lock(struct udevice *dev, u32 index);

/**
 * Disable access to any platform data
 *
 * This can be called to close off access to the firmware data in the data,
 * before calling the kernel.
 *
 * @dev		TPM device
 * Return: code of the operation
 */
u32 tpm2_disable_platform_hierarchy(struct udevice *dev);

/**
 * submit user specified data to the TPM and get response
 *
 * @dev		TPM device
 * @sendbuf:	Buffer of the data to send
 * @recvbuf:	Buffer to save the response to
 * @recv_size:	Pointer to the size of the response buffer
 *
 * Return: code of the operation
 */
u32 tpm2_submit_command(struct udevice *dev, const u8 *sendbuf,
			u8 *recvbuf, size_t *recv_size);

/**
 * tpm_cr50_report_state() - Report the Cr50 internal state
 *
 * @dev:	TPM device
 * @vendor_cmd:	Vendor command number to send
 * @vendor_subcmd: Vendor sub-command number to send
 * @recvbuf:	Buffer to save the response to
 * @recv_size:	Pointer to the size of the response buffer
 * Return: result of the operation
 */
u32 tpm2_report_state(struct udevice *dev, uint vendor_cmd, uint vendor_subcmd,
		      u8 *recvbuf, size_t *recv_size);

/**
 * tpm2_enable_nvcommits() - Tell TPM to commit NV data immediately
 *
 * For Chromium OS verified boot, we may reboot or reset at different times,
 * possibly leaving non-volatile data unwritten by the TPM.
 *
 * This vendor command is used to indicate that non-volatile data should be
 * written to its store immediately.
 *
 * @dev		TPM device
 * @vendor_cmd:	Vendor command number to send
 * @vendor_subcmd: Vendor sub-command number to send
 * Return: result of the operation
 */
u32 tpm2_enable_nvcommits(struct udevice *dev, uint vendor_cmd,
			  uint vendor_subcmd);

/**
 * tpm2_auto_start() - start up the TPM and perform selftests.
 *                     If a testable function has not been tested and is
 *                     requested the TPM2  will return TPM_RC_NEEDS_TEST.
 *
 * @param dev		TPM device
 * Return: TPM2_RC_TESTING, if TPM2 self-test is in progress.
 *         TPM2_RC_SUCCESS, if testing of all functions is complete without
 *         functional failures.
 *         TPM2_RC_FAILURE, if any test failed.
 *         TPM2_RC_INITIALIZE, if the TPM has not gone through the Startup
 *         sequence

 */
u32 tpm2_auto_start(struct udevice *dev);

/**
 * tpm2_name_to_algorithm() - Return an algorithm id given a supported
 *			      algorithm name
 *
 * @name: algorithm name
 * Return: enum tpm2_algorithms or -EINVAL
 */
enum tpm2_algorithms tpm2_name_to_algorithm(const char *name);

/**
 * tpm2_algorithm_name() - Return an algorithm name string for a
 *			   supported algorithm id
 *
 * @algorithm_id: algorithm defined in enum tpm2_algorithms
 * Return: algorithm name string or ""
 */
const char *tpm2_algorithm_name(enum tpm2_algorithms);

/**
 * tpm2_algorithm_supported() -  Check if the algorithm supported by U-Boot
 *
 * @algorithm_id: algorithm defined in enum tpm2_algorithms
 * Return: true if supported, otherwise false
 */
bool tpm2_algorithm_supported(enum tpm2_algorithms algo);

/**
 * tpm2_algorithm_to_len() - Return an algorithm length for supported algorithm id
 *
 * @algorithm_id: algorithm defined in enum tpm2_algorithms
 * Return: len or 0 if not supported
 */
u16 tpm2_algorithm_to_len(enum tpm2_algorithms algo);

/*
 * When measured boot is enabled via EFI or bootX commands all the algorithms
 * above are selected by our Kconfigs. Due to U-Boots nature of being small there
 * are cases where we need some functionality from the TPM -- e.g storage or RNG
 * but we don't want to support measurements.
 *
 * The choice of hash algorithms are determined by the platform and the TPM
 * configuration. Failing to cap a PCR in a bank which the platform left
 * active is a security vulnerability. It permits the unsealing of secrets
 * if an attacker can replay a good set of measurements into an unused bank.
 *
 * On top of that a previous stage bootloader (e.g TF-A), migh pass an eventlog
 * since it doesn't have a TPM driver, which U-Boot needs to replace. The algorit h
 * choice is a compile time option in that case and we need to make sure we conform.
 *
 * Add a variable here that sums the supported algorithms U-Boot was compiled
 * with so we can refuse to do measurements if we don't support all of them
 */

/**
 * tpm2_check_active_banks() - Check if the active PCR banks are supported by
 *                             our configuration
 *
 * @dev: TPM device
 * Return: true if allowed
 */
bool tpm2_check_active_banks(struct udevice *dev);

/**
 * tpm2_is_active_bank() - check the pcr_select. If at least one of the PCRs
 *			   supports the algorithm add it on the active ones
 *
 * @selection: PCR selection structure
 * Return: True if the algorithm is active
 */
bool tpm2_is_active_bank(struct tpms_pcr_selection *selection);

/**
 * tpm2_print_active_banks() - Print the active TPM PCRs
 *
 * @dev: TPM device
 */
void tpm2_print_active_banks(struct udevice *dev);

#endif /* __TPM_V2_H */