blob: 25b152b321384d117d693a456a1024be030f380e [file] [log] [blame]
Rong Changf6267992013-04-12 10:44:57 +00001/*
2 * Copyright (C) 2011 Infineon Technologies
3 *
4 * Authors:
5 * Peter Huewe <huewe.external@infineon.com>
6 *
7 * Version: 2.1.1
8 *
9 * Description:
10 * Device driver for TCG/TCPA TPM (trusted platform module).
11 * Specifications at www.trustedcomputinggroup.org
12 *
13 * It is based on the Linux kernel driver tpm.c from Leendert van
14 * Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall.
15 *
Simon Glass4cd7b782015-08-22 18:31:22 -060016 * SPDX-License-Identifier: GPL-2.0
Rong Changf6267992013-04-12 10:44:57 +000017 */
18
Simon Glass4cd7b782015-08-22 18:31:22 -060019#ifndef _TPM_TIS_I2C_H
20#define _TPM_TIS_I2C_H
Rong Changf6267992013-04-12 10:44:57 +000021
22#include <linux/compiler.h>
Tom Wai-Hong Tam1b393db2013-04-12 11:04:37 +000023#include <linux/types.h>
Rong Changf6267992013-04-12 10:44:57 +000024
25enum tpm_timeout {
Simon Glass42c8ec52015-08-22 18:31:30 -060026 TPM_TIMEOUT_MS = 5,
27 TIS_SHORT_TIMEOUT_MS = 750,
28 TIS_LONG_TIMEOUT_MS = 2000,
29 SLEEP_DURATION_US = 60,
30 SLEEP_DURATION_LONG_US = 210,
Rong Changf6267992013-04-12 10:44:57 +000031};
32
33/* Size of external transmit buffer (used in tpm_transmit)*/
34#define TPM_BUFSIZE 4096
35
Rong Changf6267992013-04-12 10:44:57 +000036/* Index of Count field in TPM response buffer */
Tom Wai-Hong Tam1b393db2013-04-12 11:04:37 +000037#define TPM_RSP_SIZE_BYTE 2
38#define TPM_RSP_RC_BYTE 6
Rong Changf6267992013-04-12 10:44:57 +000039
Simon Glass7c735372015-08-22 18:31:24 -060040struct tpm_chip {
41 int is_open;
Rong Changf6267992013-04-12 10:44:57 +000042 int locality;
Simon Glassb697e0f2015-08-22 18:31:38 -060043 u32 vend_dev;
Tom Wai-Hong Tam1b393db2013-04-12 11:04:37 +000044 unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* msec */
Christophe Ricard1259dcd2016-01-21 23:27:12 +010045 ulong chip_type;
Rong Changf6267992013-04-12 10:44:57 +000046};
47
Rong Changf6267992013-04-12 10:44:57 +000048struct tpm_input_header {
49 __be16 tag;
50 __be32 length;
51 __be32 ordinal;
52} __packed;
53
54struct tpm_output_header {
55 __be16 tag;
56 __be32 length;
57 __be32 return_code;
58} __packed;
59
60struct timeout_t {
61 __be32 a;
62 __be32 b;
63 __be32 c;
64 __be32 d;
65} __packed;
66
67struct duration_t {
68 __be32 tpm_short;
69 __be32 tpm_medium;
70 __be32 tpm_long;
71} __packed;
72
73union cap_t {
74 struct timeout_t timeout;
75 struct duration_t duration;
76};
77
78struct tpm_getcap_params_in {
79 __be32 cap;
80 __be32 subcap_size;
81 __be32 subcap;
82} __packed;
83
84struct tpm_getcap_params_out {
85 __be32 cap_size;
86 union cap_t cap;
87} __packed;
88
89union tpm_cmd_header {
90 struct tpm_input_header in;
91 struct tpm_output_header out;
92};
93
94union tpm_cmd_params {
95 struct tpm_getcap_params_out getcap_out;
96 struct tpm_getcap_params_in getcap_in;
97};
98
99struct tpm_cmd_t {
100 union tpm_cmd_header header;
101 union tpm_cmd_params params;
102} __packed;
103
Simon Glass13894bd2015-08-22 18:31:27 -0600104/* Max number of iterations after i2c NAK */
105#define MAX_COUNT 3
106
107/*
108 * Max number of iterations after i2c NAK for 'long' commands
109 *
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.
113 */
114#define MAX_COUNT_LONG 50
115
Simon Glass13894bd2015-08-22 18:31:27 -0600116enum tis_access {
117 TPM_ACCESS_VALID = 0x80,
118 TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
119 TPM_ACCESS_REQUEST_PENDING = 0x04,
120 TPM_ACCESS_REQUEST_USE = 0x02,
121};
122
123enum tis_status {
124 TPM_STS_VALID = 0x80,
125 TPM_STS_COMMAND_READY = 0x40,
126 TPM_STS_GO = 0x20,
127 TPM_STS_DATA_AVAIL = 0x10,
128 TPM_STS_DATA_EXPECT = 0x08,
129};
130
Rong Changf6267992013-04-12 10:44:57 +0000131#endif