tpm.h

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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 <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;
 
struct tpm_vendor_specific {
        uint8_t req_complete_mask;
        uint8_t req_complete_val;
        uint8_t req_canceled;
        int (*recv)(struct tpm_chip *, uint8_t *, size_t);
        int (*send)(struct tpm_chip *, uint8_t *, size_t);
        void (*cancel)(struct tpm_chip *);
        uint8_t (*status)(struct tpm_chip *);
        int locality;
};
 
struct tpm_chip {
        int is_open;
        struct tpm_vendor_specific vendor;
};
 
/* ---------- Interface for TPM vendor ------------ */
 
int tpm_vendor_probe(unsigned int bus, uint32_t addr);
 
int tpm_vendor_init(struct tpm_chip *chip, unsigned int bus, uint32_t dev_addr);
 
void tpm_vendor_cleanup(struct tpm_chip *chip);
 
#endif /* __DRIVERS_TPM_SLB9635_I2C_TPM_H__ */