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/*
* This file is part of the coreboot project.
*
* Copyright 2011 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef TPM_H_
#define TPM_H_
#include <stddef.h>
#include <stdint.h>
/*
* tis_init()
*
* Initialize the TPM device. Returns 0 on success or -1 on
* failure (in case device probing did not succeed).
*/
int tis_init(void);
/*
* tis_open()
*
* Requests access to locality 0 for the caller. After all commands have been
* completed the caller is supposed to call tis_close().
*
* Returns 0 on success, -1 on failure.
*/
int tis_open(void);
/*
* tis_close()
*
* terminate the currect session with the TPM by releasing the locked
* locality. Returns 0 on success of -1 on failure (in case lock
* removal did not succeed).
*/
int tis_close(void);
/*
* tis_sendrecv()
*
* Send the requested data to the TPM and then try to get its response
*
* @sendbuf - buffer of the data to send
* @send_size size of the data to send
* @recvbuf - memory to save the response to
* @recv_len - pointer to the size of the response buffer
*
* Returns 0 on success (and places the number of response bytes at recv_len)
* or -1 on failure.
*/
int tis_sendrecv(const u8 *sendbuf, size_t send_size, u8 *recvbuf,
size_t *recv_len);
void init_tpm(int s3resume);
/*
* tis_plat_irq_status()
*
* Check tpm irq and clear it.
*
* Returns 1 when irq pending or 0 when not.
*/
int tis_plat_irq_status(void);
#endif /* TPM_H_ */
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