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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2004 IBM Corporation | |
3 | * | |
4 | * Authors: | |
5 | * Leendert van Doorn <leendert@watson.ibm.com> | |
6 | * Dave Safford <safford@watson.ibm.com> | |
7 | * Reiner Sailer <sailer@watson.ibm.com> | |
8 | * Kylene Hall <kjhall@us.ibm.com> | |
9 | * | |
8e81cc13 | 10 | * Maintained by: <tpmdd-devel@lists.sourceforge.net> |
1da177e4 LT |
11 | * |
12 | * Device driver for TCG/TCPA TPM (trusted platform module). | |
13 | * Specifications at www.trustedcomputinggroup.org | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or | |
16 | * modify it under the terms of the GNU General Public License as | |
17 | * published by the Free Software Foundation, version 2 of the | |
18 | * License. | |
19 | * | |
20 | */ | |
21 | #include <linux/module.h> | |
1da177e4 LT |
22 | #include <linux/delay.h> |
23 | #include <linux/fs.h> | |
d081d470 | 24 | #include <linux/mutex.h> |
914e2637 | 25 | #include <linux/sched.h> |
1da177e4 | 26 | #include <linux/miscdevice.h> |
bbc5b212 | 27 | #include <linux/platform_device.h> |
276ad0c1 | 28 | #include <linux/io.h> |
659aaf2b | 29 | #include <linux/tpm.h> |
1da177e4 | 30 | |
3122a88a KH |
31 | enum tpm_timeout { |
32 | TPM_TIMEOUT = 5, /* msecs */ | |
33 | }; | |
1da177e4 LT |
34 | |
35 | /* TPM addresses */ | |
3122a88a | 36 | enum tpm_addr { |
daacdfa6 | 37 | TPM_SUPERIO_ADDR = 0x2E, |
3122a88a | 38 | TPM_ADDR = 0x4E, |
3122a88a KH |
39 | }; |
40 | ||
6659ca2a KH |
41 | extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr, |
42 | char *); | |
43 | extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr, | |
44 | char *); | |
45 | extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr, | |
46 | char *); | |
08e96e48 KJH |
47 | extern ssize_t tpm_show_caps_1_2(struct device *, struct device_attribute *attr, |
48 | char *); | |
6659ca2a KH |
49 | extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr, |
50 | const char *, size_t); | |
08e96e48 KJH |
51 | extern ssize_t tpm_show_enabled(struct device *, struct device_attribute *attr, |
52 | char *); | |
53 | extern ssize_t tpm_show_active(struct device *, struct device_attribute *attr, | |
54 | char *); | |
55 | extern ssize_t tpm_show_owned(struct device *, struct device_attribute *attr, | |
56 | char *); | |
57 | extern ssize_t tpm_show_temp_deactivated(struct device *, | |
58 | struct device_attribute *attr, char *); | |
1da177e4 LT |
59 | |
60 | struct tpm_chip; | |
61 | ||
62 | struct tpm_vendor_specific { | |
e0dd03ca KJH |
63 | const u8 req_complete_mask; |
64 | const u8 req_complete_val; | |
65 | const u8 req_canceled; | |
ad5ea3cc KJH |
66 | void __iomem *iobase; /* ioremapped address */ |
67 | unsigned long base; /* TPM base address */ | |
68 | ||
27084efe LD |
69 | int irq; |
70 | ||
ad5ea3cc KJH |
71 | int region_size; |
72 | int have_region; | |
1da177e4 LT |
73 | |
74 | int (*recv) (struct tpm_chip *, u8 *, size_t); | |
75 | int (*send) (struct tpm_chip *, u8 *, size_t); | |
76 | void (*cancel) (struct tpm_chip *); | |
b4ed3e3c | 77 | u8 (*status) (struct tpm_chip *); |
5bd91f18 | 78 | void (*release) (struct device *); |
1da177e4 | 79 | struct miscdevice miscdev; |
6659ca2a | 80 | struct attribute_group *attr_group; |
27084efe LD |
81 | struct list_head list; |
82 | int locality; | |
36b20020 KJH |
83 | unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */ |
84 | unsigned long duration[3]; /* jiffies */ | |
27084efe LD |
85 | |
86 | wait_queue_head_t read_queue; | |
87 | wait_queue_head_t int_queue; | |
1da177e4 LT |
88 | }; |
89 | ||
90 | struct tpm_chip { | |
e659a3fe | 91 | struct device *dev; /* Device stuff */ |
1da177e4 LT |
92 | |
93 | int dev_num; /* /dev/tpm# */ | |
dc36d32c | 94 | unsigned long is_open; /* only one allowed */ |
1da177e4 LT |
95 | int time_expired; |
96 | ||
97 | /* Data passed to and from the tpm via the read/write calls */ | |
98 | u8 *data_buffer; | |
99 | atomic_t data_pending; | |
d081d470 | 100 | struct mutex buffer_mutex; |
1da177e4 LT |
101 | |
102 | struct timer_list user_read_timer; /* user needs to claim result */ | |
09e12f9f | 103 | struct work_struct work; |
d081d470 | 104 | struct mutex tpm_mutex; /* tpm is processing */ |
1da177e4 | 105 | |
90dda520 | 106 | struct tpm_vendor_specific vendor; |
1da177e4 | 107 | |
55a82ab3 KJH |
108 | struct dentry **bios_dir; |
109 | ||
1da177e4 | 110 | struct list_head list; |
5bd91f18 | 111 | void (*release) (struct device *); |
1da177e4 LT |
112 | }; |
113 | ||
27084efe LD |
114 | #define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor) |
115 | ||
daacdfa6 | 116 | static inline int tpm_read_index(int base, int index) |
1da177e4 | 117 | { |
daacdfa6 KJH |
118 | outb(index, base); |
119 | return inb(base+1) & 0xFF; | |
1da177e4 LT |
120 | } |
121 | ||
daacdfa6 | 122 | static inline void tpm_write_index(int base, int index, int value) |
1da177e4 | 123 | { |
daacdfa6 KJH |
124 | outb(index, base); |
125 | outb(value & 0xFF, base+1); | |
1da177e4 | 126 | } |
08837438 RA |
127 | struct tpm_input_header { |
128 | __be16 tag; | |
129 | __be32 length; | |
130 | __be32 ordinal; | |
131 | }__attribute__((packed)); | |
132 | ||
133 | struct tpm_output_header { | |
134 | __be16 tag; | |
135 | __be32 length; | |
136 | __be32 return_code; | |
137 | }__attribute__((packed)); | |
138 | ||
139 | struct stclear_flags_t { | |
140 | __be16 tag; | |
141 | u8 deactivated; | |
142 | u8 disableForceClear; | |
143 | u8 physicalPresence; | |
144 | u8 physicalPresenceLock; | |
145 | u8 bGlobalLock; | |
146 | }__attribute__((packed)); | |
147 | ||
148 | struct tpm_version_t { | |
149 | u8 Major; | |
150 | u8 Minor; | |
151 | u8 revMajor; | |
152 | u8 revMinor; | |
153 | }__attribute__((packed)); | |
154 | ||
155 | struct tpm_version_1_2_t { | |
156 | __be16 tag; | |
157 | u8 Major; | |
158 | u8 Minor; | |
159 | u8 revMajor; | |
160 | u8 revMinor; | |
161 | }__attribute__((packed)); | |
162 | ||
163 | struct timeout_t { | |
164 | __be32 a; | |
165 | __be32 b; | |
166 | __be32 c; | |
167 | __be32 d; | |
168 | }__attribute__((packed)); | |
169 | ||
170 | struct duration_t { | |
171 | __be32 tpm_short; | |
172 | __be32 tpm_medium; | |
173 | __be32 tpm_long; | |
174 | }__attribute__((packed)); | |
175 | ||
176 | struct permanent_flags_t { | |
177 | __be16 tag; | |
178 | u8 disable; | |
179 | u8 ownership; | |
180 | u8 deactivated; | |
181 | u8 readPubek; | |
182 | u8 disableOwnerClear; | |
183 | u8 allowMaintenance; | |
184 | u8 physicalPresenceLifetimeLock; | |
185 | u8 physicalPresenceHWEnable; | |
186 | u8 physicalPresenceCMDEnable; | |
187 | u8 CEKPUsed; | |
188 | u8 TPMpost; | |
189 | u8 TPMpostLock; | |
190 | u8 FIPS; | |
191 | u8 operator; | |
192 | u8 enableRevokeEK; | |
193 | u8 nvLocked; | |
194 | u8 readSRKPub; | |
195 | u8 tpmEstablished; | |
196 | u8 maintenanceDone; | |
197 | u8 disableFullDALogicInfo; | |
198 | }__attribute__((packed)); | |
199 | ||
200 | typedef union { | |
201 | struct permanent_flags_t perm_flags; | |
202 | struct stclear_flags_t stclear_flags; | |
203 | bool owned; | |
204 | __be32 num_pcrs; | |
205 | struct tpm_version_t tpm_version; | |
206 | struct tpm_version_1_2_t tpm_version_1_2; | |
207 | __be32 manufacturer_id; | |
208 | struct timeout_t timeout; | |
209 | struct duration_t duration; | |
210 | } cap_t; | |
211 | ||
212 | struct tpm_getcap_params_in { | |
213 | __be32 cap; | |
214 | __be32 subcap_size; | |
215 | __be32 subcap; | |
216 | }__attribute__((packed)); | |
217 | ||
218 | struct tpm_getcap_params_out { | |
219 | __be32 cap_size; | |
220 | cap_t cap; | |
221 | }__attribute__((packed)); | |
222 | ||
223 | struct tpm_readpubek_params_out { | |
224 | u8 algorithm[4]; | |
225 | u8 encscheme[2]; | |
226 | u8 sigscheme[2]; | |
02a077c5 | 227 | __be32 paramsize; |
08837438 RA |
228 | u8 parameters[12]; /*assuming RSA*/ |
229 | __be32 keysize; | |
230 | u8 modulus[256]; | |
231 | u8 checksum[20]; | |
232 | }__attribute__((packed)); | |
233 | ||
234 | typedef union { | |
235 | struct tpm_input_header in; | |
236 | struct tpm_output_header out; | |
237 | } tpm_cmd_header; | |
238 | ||
659aaf2b RA |
239 | #define TPM_DIGEST_SIZE 20 |
240 | struct tpm_pcrread_out { | |
241 | u8 pcr_result[TPM_DIGEST_SIZE]; | |
242 | }__attribute__((packed)); | |
243 | ||
244 | struct tpm_pcrread_in { | |
245 | __be32 pcr_idx; | |
246 | }__attribute__((packed)); | |
247 | ||
248 | struct tpm_pcrextend_in { | |
249 | __be32 pcr_idx; | |
250 | u8 hash[TPM_DIGEST_SIZE]; | |
251 | }__attribute__((packed)); | |
252 | ||
08837438 RA |
253 | typedef union { |
254 | struct tpm_getcap_params_out getcap_out; | |
255 | struct tpm_readpubek_params_out readpubek_out; | |
256 | u8 readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)]; | |
257 | struct tpm_getcap_params_in getcap_in; | |
659aaf2b RA |
258 | struct tpm_pcrread_in pcrread_in; |
259 | struct tpm_pcrread_out pcrread_out; | |
260 | struct tpm_pcrextend_in pcrextend_in; | |
08837438 RA |
261 | } tpm_cmd_params; |
262 | ||
263 | struct tpm_cmd_t { | |
264 | tpm_cmd_header header; | |
265 | tpm_cmd_params params; | |
266 | }__attribute__((packed)); | |
267 | ||
268 | ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *); | |
1da177e4 | 269 | |
08e96e48 KJH |
270 | extern void tpm_get_timeouts(struct tpm_chip *); |
271 | extern void tpm_gen_interrupt(struct tpm_chip *); | |
272 | extern void tpm_continue_selftest(struct tpm_chip *); | |
9e18ee19 | 273 | extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32); |
e0dd03ca KJH |
274 | extern struct tpm_chip* tpm_register_hardware(struct device *, |
275 | const struct tpm_vendor_specific *); | |
1da177e4 LT |
276 | extern int tpm_open(struct inode *, struct file *); |
277 | extern int tpm_release(struct inode *, struct file *); | |
253115b7 | 278 | extern void tpm_dev_vendor_release(struct tpm_chip *); |
1da177e4 LT |
279 | extern ssize_t tpm_write(struct file *, const char __user *, size_t, |
280 | loff_t *); | |
281 | extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *); | |
e659a3fe | 282 | extern void tpm_remove_hardware(struct device *); |
ce2c87d4 KJH |
283 | extern int tpm_pm_suspend(struct device *, pm_message_t); |
284 | extern int tpm_pm_resume(struct device *); | |
55a82ab3 KJH |
285 | |
286 | #ifdef CONFIG_ACPI | |
287 | extern struct dentry ** tpm_bios_log_setup(char *); | |
288 | extern void tpm_bios_log_teardown(struct dentry **); | |
289 | #else | |
bb53a761 | 290 | static inline struct dentry ** tpm_bios_log_setup(char *name) |
55a82ab3 KJH |
291 | { |
292 | return NULL; | |
293 | } | |
294 | static inline void tpm_bios_log_teardown(struct dentry **dir) | |
295 | { | |
296 | } | |
297 | #endif |