2 * Copyright (C) 2011 Infineon Technologies
5 * Peter Huewe <huewe.external@infineon.com>
10 * Device driver for TCG/TCPA TPM (trusted platform module).
11 * Specifications at www.trustedcomputinggroup.org
13 * It is based on the Linux kernel driver tpm.c from Leendert van
14 * Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall.
16 * SPDX-License-Identifier: GPL-2.0
19 #ifndef _TPM_TIS_I2C_H
20 #define _TPM_TIS_I2C_H
22 #include <linux/compiler.h>
23 #include <linux/types.h>
27 TIS_SHORT_TIMEOUT_MS
= 750,
28 TIS_LONG_TIMEOUT_MS
= 2000,
29 SLEEP_DURATION_US
= 60,
30 SLEEP_DURATION_LONG_US
= 210,
33 /* Size of external transmit buffer (used in tpm_transmit)*/
34 #define TPM_BUFSIZE 4096
36 /* Index of Count field in TPM response buffer */
37 #define TPM_RSP_SIZE_BYTE 2
38 #define TPM_RSP_RC_BYTE 6
44 unsigned long timeout_a
, timeout_b
, timeout_c
, timeout_d
; /* msec */
48 struct tpm_input_header
{
54 struct tpm_output_header
{
74 struct timeout_t timeout
;
75 struct duration_t duration
;
78 struct tpm_getcap_params_in
{
84 struct tpm_getcap_params_out
{
89 union tpm_cmd_header
{
90 struct tpm_input_header in
;
91 struct tpm_output_header out
;
94 union tpm_cmd_params
{
95 struct tpm_getcap_params_out getcap_out
;
96 struct tpm_getcap_params_in getcap_in
;
100 union tpm_cmd_header header
;
101 union tpm_cmd_params params
;
104 /* Max number of iterations after i2c NAK */
108 * Max number of iterations after i2c NAK for 'long' commands
110 * We need this especially for sending TPM_READY, since the cleanup after the
111 * transtion to the ready state may take some time, but it is unpredictable
112 * how long it will take.
114 #define MAX_COUNT_LONG 50
117 TPM_ACCESS_VALID
= 0x80,
118 TPM_ACCESS_ACTIVE_LOCALITY
= 0x20,
119 TPM_ACCESS_REQUEST_PENDING
= 0x04,
120 TPM_ACCESS_REQUEST_USE
= 0x02,
124 TPM_STS_VALID
= 0x80,
125 TPM_STS_COMMAND_READY
= 0x40,
127 TPM_STS_DATA_AVAIL
= 0x10,
128 TPM_STS_DATA_EXPECT
= 0x08,