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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Description:
* Device driver for TCG/TCPA TPM (trusted platform module).
* Specifications at www.trustedcomputinggroup.org
*
* It is based on the Linux kernel driver tpm.c from Leendert van
* Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall.
*/
#ifndef __DRIVERS_TPM_SLB9635_I2C_TPM_H__
#define __DRIVERS_TPM_SLB9635_I2C_TPM_H__
#include <security/tpm/tis.h>
#include <security/tpm/tss_errors.h>
#include <stdint.h>
enum tpm_timeout {
TPM_TIMEOUT = 1, /* msecs */
};
/* Size of external transmit buffer (used for stack buffer in tpm_sendrecv) */
#define TPM_BUFSIZE 1260
/* Number of bytes in the TPM header */
#define TPM_HEADER_SIZE 10
/* Index of fields in TPM command buffer */
#define TPM_CMD_SIZE_BYTE 2
#define TPM_CMD_ORDINAL_BYTE 6
/* Index of Count field in TPM response buffer */
#define TPM_RSP_SIZE_BYTE 2
#define TPM_RSP_RC_BYTE 6
#define TPM_ACCESS(l) (0x0000 | ((l) << 4))
#define TPM_STS(l) (0x0001 | ((l) << 4))
#define TPM_DATA_FIFO(l) (0x0005 | ((l) << 4))
#define TPM_DID_VID(l) (0x0006 | ((l) << 4))
struct tpm_chip {
uint8_t req_complete_mask;
uint8_t req_complete_val;
uint8_t req_canceled;
int (*recv)(uint8_t *buf, size_t len);
int (*send)(uint8_t *buf, size_t len);
void (*cancel)(void);
uint8_t (*status)(void);
};
/* ---------- Interface for TPM vendor ------------ */
tpm_result_t tpm_vendor_probe(unsigned int bus, uint32_t addr, enum tpm_family *family);
tpm_result_t tpm_vendor_init(struct tpm_chip *chip, unsigned int bus, uint32_t dev_addr);
tis_sendrecv_fn i2c_tis_probe(enum tpm_family *family);
#endif /* __DRIVERS_TPM_SLB9635_I2C_TPM_H__ */
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