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| 1 /* |
| 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 * |
| 16 * |
| 17 * See file CREDITS for list of people who contributed to this |
| 18 * project. |
| 19 * |
| 20 * This program is free software; you can redistribute it and/or |
| 21 * modify it under the terms of the GNU General Public License as |
| 22 * published by the Free Software Foundation, version 2 of the |
| 23 * License. |
| 24 * |
| 25 * This program is distributed in the hope that it will be useful, |
| 26 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 27 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 28 * GNU General Public License for more details. |
| 29 * |
| 30 * You should have received a copy of the GNU General Public License |
| 31 * along with this program; if not, write to the Free Software |
| 32 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 33 * MA 02111-1307 USA |
| 34 */ |
| 35 |
| 36 #ifndef _TPM_H_ |
| 37 #define _TPM_H_ |
| 38 |
| 39 #include "compatibility.h" |
| 40 |
| 41 enum tpm_timeout { |
| 42 TPM_TIMEOUT = 5, /* msecs */ |
| 43 }; |
| 44 |
| 45 /* Size of external transmit buffer (used in tpm_transmit)*/ |
| 46 #define TPM_BUFSIZE 4096 |
| 47 |
| 48 /* Index of fields in TPM command buffer */ |
| 49 #define TPM_CMD_SIZE_BYTE 2 |
| 50 #define TPM_CMD_ORDINAL_BYTE 6 |
| 51 |
| 52 /* Index of Count field in TPM response buffer */ |
| 53 #define TPM_RSP_SIZE_BYTE 2 |
| 54 #define TPM_RSP_RC_BYTE 6 |
| 55 |
| 56 struct tpm_chip; |
| 57 |
| 58 struct tpm_vendor_specific { |
| 59 const u8 req_complete_mask; |
| 60 const u8 req_complete_val; |
| 61 const u8 req_canceled; |
| 62 int irq; |
| 63 int (*recv) (struct tpm_chip *, u8 *, size_t); |
| 64 int (*send) (struct tpm_chip *, u8 *, size_t); |
| 65 void (*cancel) (struct tpm_chip *); |
| 66 u8(*status) (struct tpm_chip *); |
| 67 int locality; |
| 68 unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* msec */ |
| 69 unsigned long duration[3]; /* msec */ |
| 70 }; |
| 71 |
| 72 struct tpm_chip { |
| 73 int is_open; |
| 74 struct tpm_vendor_specific vendor; |
| 75 }; |
| 76 |
| 77 struct tpm_input_header { |
| 78 __be16 tag; |
| 79 __be32 length; |
| 80 __be32 ordinal; |
| 81 } __attribute__ ((packed)); |
| 82 |
| 83 struct tpm_output_header { |
| 84 __be16 tag; |
| 85 __be32 length; |
| 86 __be32 return_code; |
| 87 } __attribute__ ((packed)); |
| 88 |
| 89 struct timeout_t { |
| 90 __be32 a; |
| 91 __be32 b; |
| 92 __be32 c; |
| 93 __be32 d; |
| 94 } __attribute__ ((packed)); |
| 95 |
| 96 struct duration_t { |
| 97 __be32 tpm_short; |
| 98 __be32 tpm_medium; |
| 99 __be32 tpm_long; |
| 100 } __attribute__ ((packed)); |
| 101 |
| 102 typedef union { |
| 103 struct timeout_t timeout; |
| 104 struct duration_t duration; |
| 105 } cap_t; |
| 106 |
| 107 struct tpm_getcap_params_in { |
| 108 __be32 cap; |
| 109 __be32 subcap_size; |
| 110 __be32 subcap; |
| 111 } __attribute__ ((packed)); |
| 112 |
| 113 struct tpm_getcap_params_out { |
| 114 __be32 cap_size; |
| 115 cap_t cap; |
| 116 } __attribute__ ((packed)); |
| 117 |
| 118 typedef union { |
| 119 struct tpm_input_header in; |
| 120 struct tpm_output_header out; |
| 121 } tpm_cmd_header; |
| 122 |
| 123 typedef union { |
| 124 struct tpm_getcap_params_out getcap_out; |
| 125 struct tpm_getcap_params_in getcap_in; |
| 126 } tpm_cmd_params; |
| 127 |
| 128 struct tpm_cmd_t { |
| 129 tpm_cmd_header header; |
| 130 tpm_cmd_params params; |
| 131 } __attribute__ ((packed)); |
| 132 |
| 133 |
| 134 /* ---------- Interface for TPM vendor ------------ */ |
| 135 |
| 136 extern struct tpm_chip *tpm_register_hardware( |
| 137 const struct tpm_vendor_specific *); |
| 138 |
| 139 extern int tpm_vendor_init(uint32_t dev_addr); |
| 140 |
| 141 extern void tpm_vendor_cleanup(struct tpm_chip *chip); |
| 142 |
| 143 /* ---------- Interface for TDDL ------------------- */ |
| 144 |
| 145 /* |
| 146 * if dev_addr != 0 - redefines TPM device address |
| 147 * Returns < 0 on error, 0 on success. |
| 148 */ |
| 149 extern int tpm_open(uint32_t dev_addr); |
| 150 |
| 151 extern void tpm_close(void); |
| 152 |
| 153 /* |
| 154 * Transmit bufsiz bytes out of buf to TPM and get results back in buf, too. |
| 155 * Returns < 0 on error, 0 on success. |
| 156 */ |
| 157 extern ssize_t tpm_transmit(const unsigned char *buf, size_t bufsiz); |
| 158 |
| 159 #endif |
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