1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2011 Infineon Technologies 4 * 5 * Authors: 6 * Peter Huewe <huewe.external@infineon.com> 7 * 8 * Version: 2.1.1 9 * 10 * Description: 11 * Device driver for TCG/TCPA TPM (trusted platform module). 12 * Specifications at www.trustedcomputinggroup.org 13 * 14 * It is based on the Linux kernel driver tpm.c from Leendert van 15 * Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall. 16 */ 17 18 #ifndef _TPM_TIS_I2C_H 19 #define _TPM_TIS_I2C_H 20 21 #include <linux/compiler.h> 22 #include <linux/types.h> 23 24 enum tpm_timeout { 25 TPM_TIMEOUT_MS = 5, 26 TIS_SHORT_TIMEOUT_MS = 750, 27 TIS_LONG_TIMEOUT_MS = 2000, 28 SLEEP_DURATION_US = 60, 29 SLEEP_DURATION_LONG_US = 210, 30 }; 31 32 /* Size of external transmit buffer (used in tpm_transmit)*/ 33 #define TPM_BUFSIZE 4096 34 35 /* Index of Count field in TPM response buffer */ 36 #define TPM_RSP_SIZE_BYTE 2 37 #define TPM_RSP_RC_BYTE 6 38 39 struct tpm_chip { 40 int is_open; 41 int locality; 42 u32 vend_dev; 43 u8 rid; 44 unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* msec */ 45 ulong chip_type; 46 }; 47 48 struct tpm_input_header { 49 __be16 tag; 50 __be32 length; 51 __be32 ordinal; 52 } __packed; 53 54 struct tpm_output_header { 55 __be16 tag; 56 __be32 length; 57 __be32 return_code; 58 } __packed; 59 60 struct timeout_t { 61 __be32 a; 62 __be32 b; 63 __be32 c; 64 __be32 d; 65 } __packed; 66 67 struct duration_t { 68 __be32 tpm_short; 69 __be32 tpm_medium; 70 __be32 tpm_long; 71 } __packed; 72 73 union cap_t { 74 struct timeout_t timeout; 75 struct duration_t duration; 76 }; 77 78 struct tpm_getcap_params_in { 79 __be32 cap; 80 __be32 subcap_size; 81 __be32 subcap; 82 } __packed; 83 84 struct tpm_getcap_params_out { 85 __be32 cap_size; 86 union cap_t cap; 87 } __packed; 88 89 union tpm_cmd_header { 90 struct tpm_input_header in; 91 struct tpm_output_header out; 92 }; 93 94 union tpm_cmd_params { 95 struct tpm_getcap_params_out getcap_out; 96 struct tpm_getcap_params_in getcap_in; 97 }; 98 99 struct tpm_cmd_t { 100 union tpm_cmd_header header; 101 union tpm_cmd_params params; 102 } __packed; 103 104 /* 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 50 115 116 enum 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 }; 122 123 enum 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 }; 130 131 #endif 132