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/*
* Copyright (C) 2011 Infineon Technologies
*
* Authors:
* Peter Huewe <huewe.external@infineon.com>
*
* Version: 2.1.1
*
* 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.
*
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#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 in tpm_transmit)*/
#define TPM_BUFSIZE 4096
/* 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
struct tpm_chip;
struct tpm_vendor_specific {
const uint8_t req_complete_mask;
const uint8_t req_complete_val;
const uint8_t req_canceled;
int irq;
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;
};
struct tpm_input_header {
uint16_t tag;
uint32_t length;
uint32_t ordinal;
} __attribute__ ((packed));
struct tpm_output_header {
uint16_t tag;
uint32_t length;
uint32_t return_code;
} __attribute__ ((packed));
struct timeout_t {
uint32_t a;
uint32_t b;
uint32_t c;
uint32_t d;
} __attribute__ ((packed));
struct duration_t {
uint32_t tpm_short;
uint32_t tpm_medium;
uint32_t tpm_long;
} __attribute__ ((packed));
typedef union {
struct timeout_t timeout;
struct duration_t duration;
} cap_t;
struct tpm_getcap_params_in {
uint32_t cap;
uint32_t subcap_size;
uint32_t subcap;
} __attribute__ ((packed));
struct tpm_getcap_params_out {
uint32_t cap_size;
cap_t cap;
} __attribute__ ((packed));
typedef union {
struct tpm_input_header in;
struct tpm_output_header out;
} tpm_cmd_header;
typedef union {
struct tpm_getcap_params_out getcap_out;
struct tpm_getcap_params_in getcap_in;
} tpm_cmd_params;
struct tpm_cmd_t {
tpm_cmd_header header;
tpm_cmd_params params;
} __attribute__ ((packed));
/* ---------- Interface for TPM vendor ------------ */
struct tpm_chip *tpm_register_hardware(const struct tpm_vendor_specific *);
int tpm_vendor_init(unsigned bus, uint32_t dev_addr);
void tpm_vendor_cleanup(struct tpm_chip *chip);
/* ---------- Interface for TDDL ------------------- */
/*
* if dev_addr != 0 - redefines TPM device address
* Returns < 0 on error, 0 on success.
*/
int tpm_open(unsigned bus, uint32_t dev_addr);
void tpm_close(void);
/*
* Transmit bufsiz bytes out of buf to TPM and get results back in buf, too.
* Returns < 0 on error, 0 on success.
*/
ssize_t tpm_transmit(const unsigned char *buf, size_t bufsiz);
#endif /* __DRIVERS_TPM_SLB9635_I2C_TPM_H__ */
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