Commit | Line | Data |
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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 | |
41ab999c KY |
31 | enum tpm_const { |
32 | TPM_MINOR = 224, /* officially assigned */ | |
33 | TPM_BUFSIZE = 4096, | |
34 | TPM_NUM_DEVICES = 256, | |
35 | }; | |
36 | ||
3122a88a KH |
37 | enum tpm_timeout { |
38 | TPM_TIMEOUT = 5, /* msecs */ | |
39 | }; | |
1da177e4 LT |
40 | |
41 | /* TPM addresses */ | |
3122a88a | 42 | enum tpm_addr { |
daacdfa6 | 43 | TPM_SUPERIO_ADDR = 0x2E, |
3122a88a | 44 | TPM_ADDR = 0x4E, |
3122a88a KH |
45 | }; |
46 | ||
68d6e671 | 47 | #define TPM_WARN_DOING_SELFTEST 0x802 |
be405411 SB |
48 | #define TPM_ERR_DEACTIVATED 0x6 |
49 | #define TPM_ERR_DISABLED 0x7 | |
c584af19 | 50 | #define TPM_ERR_INVALID_POSTINIT 38 |
be405411 | 51 | |
b9e3238a | 52 | #define TPM_HEADER_SIZE 10 |
6659ca2a KH |
53 | extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr, |
54 | char *); | |
55 | extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr, | |
56 | char *); | |
57 | extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr, | |
58 | char *); | |
08e96e48 KJH |
59 | extern ssize_t tpm_show_caps_1_2(struct device *, struct device_attribute *attr, |
60 | char *); | |
6659ca2a KH |
61 | extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr, |
62 | const char *, size_t); | |
08e96e48 KJH |
63 | extern ssize_t tpm_show_enabled(struct device *, struct device_attribute *attr, |
64 | char *); | |
65 | extern ssize_t tpm_show_active(struct device *, struct device_attribute *attr, | |
66 | char *); | |
67 | extern ssize_t tpm_show_owned(struct device *, struct device_attribute *attr, | |
68 | char *); | |
69 | extern ssize_t tpm_show_temp_deactivated(struct device *, | |
70 | struct device_attribute *attr, char *); | |
04ab2293 SB |
71 | extern ssize_t tpm_show_durations(struct device *, |
72 | struct device_attribute *attr, char *); | |
62592101 SB |
73 | extern ssize_t tpm_show_timeouts(struct device *, |
74 | struct device_attribute *attr, char *); | |
1da177e4 LT |
75 | |
76 | struct tpm_chip; | |
77 | ||
78 | struct tpm_vendor_specific { | |
e0dd03ca KJH |
79 | const u8 req_complete_mask; |
80 | const u8 req_complete_val; | |
81 | const u8 req_canceled; | |
ad5ea3cc KJH |
82 | void __iomem *iobase; /* ioremapped address */ |
83 | unsigned long base; /* TPM base address */ | |
84 | ||
27084efe | 85 | int irq; |
a7b66822 | 86 | int probed_irq; |
27084efe | 87 | |
ad5ea3cc KJH |
88 | int region_size; |
89 | int have_region; | |
1da177e4 LT |
90 | |
91 | int (*recv) (struct tpm_chip *, u8 *, size_t); | |
92 | int (*send) (struct tpm_chip *, u8 *, size_t); | |
93 | void (*cancel) (struct tpm_chip *); | |
b4ed3e3c | 94 | u8 (*status) (struct tpm_chip *); |
5bd91f18 | 95 | void (*release) (struct device *); |
1da177e4 | 96 | struct miscdevice miscdev; |
6659ca2a | 97 | struct attribute_group *attr_group; |
27084efe LD |
98 | struct list_head list; |
99 | int locality; | |
36b20020 | 100 | unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */ |
62592101 | 101 | bool timeout_adjusted; |
36b20020 | 102 | unsigned long duration[3]; /* jiffies */ |
04ab2293 | 103 | bool duration_adjusted; |
132f7629 | 104 | void *data; |
27084efe LD |
105 | |
106 | wait_queue_head_t read_queue; | |
107 | wait_queue_head_t int_queue; | |
1da177e4 LT |
108 | }; |
109 | ||
4e401fb0 SB |
110 | #define TPM_VID_INTEL 0x8086 |
111 | ||
1da177e4 | 112 | struct tpm_chip { |
e659a3fe | 113 | struct device *dev; /* Device stuff */ |
1da177e4 LT |
114 | |
115 | int dev_num; /* /dev/tpm# */ | |
dc36d32c | 116 | unsigned long is_open; /* only one allowed */ |
1da177e4 LT |
117 | int time_expired; |
118 | ||
119 | /* Data passed to and from the tpm via the read/write calls */ | |
120 | u8 *data_buffer; | |
121 | atomic_t data_pending; | |
d081d470 | 122 | struct mutex buffer_mutex; |
1da177e4 LT |
123 | |
124 | struct timer_list user_read_timer; /* user needs to claim result */ | |
09e12f9f | 125 | struct work_struct work; |
d081d470 | 126 | struct mutex tpm_mutex; /* tpm is processing */ |
1da177e4 | 127 | |
90dda520 | 128 | struct tpm_vendor_specific vendor; |
1da177e4 | 129 | |
55a82ab3 KJH |
130 | struct dentry **bios_dir; |
131 | ||
1da177e4 | 132 | struct list_head list; |
5bd91f18 | 133 | void (*release) (struct device *); |
1da177e4 LT |
134 | }; |
135 | ||
27084efe LD |
136 | #define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor) |
137 | ||
a0e39349 MZ |
138 | static inline void tpm_chip_put(struct tpm_chip *chip) |
139 | { | |
140 | module_put(chip->dev->driver->owner); | |
141 | } | |
142 | ||
daacdfa6 | 143 | static inline int tpm_read_index(int base, int index) |
1da177e4 | 144 | { |
daacdfa6 KJH |
145 | outb(index, base); |
146 | return inb(base+1) & 0xFF; | |
1da177e4 LT |
147 | } |
148 | ||
daacdfa6 | 149 | static inline void tpm_write_index(int base, int index, int value) |
1da177e4 | 150 | { |
daacdfa6 KJH |
151 | outb(index, base); |
152 | outb(value & 0xFF, base+1); | |
1da177e4 | 153 | } |
08837438 RA |
154 | struct tpm_input_header { |
155 | __be16 tag; | |
156 | __be32 length; | |
157 | __be32 ordinal; | |
158 | }__attribute__((packed)); | |
159 | ||
160 | struct tpm_output_header { | |
161 | __be16 tag; | |
162 | __be32 length; | |
163 | __be32 return_code; | |
164 | }__attribute__((packed)); | |
165 | ||
166 | struct stclear_flags_t { | |
167 | __be16 tag; | |
168 | u8 deactivated; | |
169 | u8 disableForceClear; | |
170 | u8 physicalPresence; | |
171 | u8 physicalPresenceLock; | |
172 | u8 bGlobalLock; | |
173 | }__attribute__((packed)); | |
174 | ||
175 | struct tpm_version_t { | |
176 | u8 Major; | |
177 | u8 Minor; | |
178 | u8 revMajor; | |
179 | u8 revMinor; | |
180 | }__attribute__((packed)); | |
181 | ||
182 | struct tpm_version_1_2_t { | |
183 | __be16 tag; | |
184 | u8 Major; | |
185 | u8 Minor; | |
186 | u8 revMajor; | |
187 | u8 revMinor; | |
188 | }__attribute__((packed)); | |
189 | ||
190 | struct timeout_t { | |
191 | __be32 a; | |
192 | __be32 b; | |
193 | __be32 c; | |
194 | __be32 d; | |
195 | }__attribute__((packed)); | |
196 | ||
197 | struct duration_t { | |
198 | __be32 tpm_short; | |
199 | __be32 tpm_medium; | |
200 | __be32 tpm_long; | |
201 | }__attribute__((packed)); | |
202 | ||
203 | struct permanent_flags_t { | |
204 | __be16 tag; | |
205 | u8 disable; | |
206 | u8 ownership; | |
207 | u8 deactivated; | |
208 | u8 readPubek; | |
209 | u8 disableOwnerClear; | |
210 | u8 allowMaintenance; | |
211 | u8 physicalPresenceLifetimeLock; | |
212 | u8 physicalPresenceHWEnable; | |
213 | u8 physicalPresenceCMDEnable; | |
214 | u8 CEKPUsed; | |
215 | u8 TPMpost; | |
216 | u8 TPMpostLock; | |
217 | u8 FIPS; | |
218 | u8 operator; | |
219 | u8 enableRevokeEK; | |
220 | u8 nvLocked; | |
221 | u8 readSRKPub; | |
222 | u8 tpmEstablished; | |
223 | u8 maintenanceDone; | |
224 | u8 disableFullDALogicInfo; | |
225 | }__attribute__((packed)); | |
226 | ||
227 | typedef union { | |
228 | struct permanent_flags_t perm_flags; | |
229 | struct stclear_flags_t stclear_flags; | |
230 | bool owned; | |
231 | __be32 num_pcrs; | |
232 | struct tpm_version_t tpm_version; | |
233 | struct tpm_version_1_2_t tpm_version_1_2; | |
234 | __be32 manufacturer_id; | |
235 | struct timeout_t timeout; | |
236 | struct duration_t duration; | |
237 | } cap_t; | |
238 | ||
239 | struct tpm_getcap_params_in { | |
240 | __be32 cap; | |
241 | __be32 subcap_size; | |
242 | __be32 subcap; | |
243 | }__attribute__((packed)); | |
244 | ||
245 | struct tpm_getcap_params_out { | |
246 | __be32 cap_size; | |
247 | cap_t cap; | |
248 | }__attribute__((packed)); | |
249 | ||
250 | struct tpm_readpubek_params_out { | |
251 | u8 algorithm[4]; | |
252 | u8 encscheme[2]; | |
253 | u8 sigscheme[2]; | |
02a077c5 | 254 | __be32 paramsize; |
08837438 RA |
255 | u8 parameters[12]; /*assuming RSA*/ |
256 | __be32 keysize; | |
257 | u8 modulus[256]; | |
258 | u8 checksum[20]; | |
259 | }__attribute__((packed)); | |
260 | ||
261 | typedef union { | |
262 | struct tpm_input_header in; | |
263 | struct tpm_output_header out; | |
264 | } tpm_cmd_header; | |
265 | ||
659aaf2b RA |
266 | #define TPM_DIGEST_SIZE 20 |
267 | struct tpm_pcrread_out { | |
268 | u8 pcr_result[TPM_DIGEST_SIZE]; | |
269 | }__attribute__((packed)); | |
270 | ||
271 | struct tpm_pcrread_in { | |
272 | __be32 pcr_idx; | |
273 | }__attribute__((packed)); | |
274 | ||
275 | struct tpm_pcrextend_in { | |
276 | __be32 pcr_idx; | |
277 | u8 hash[TPM_DIGEST_SIZE]; | |
278 | }__attribute__((packed)); | |
279 | ||
41ab999c KY |
280 | /* 128 bytes is an arbitrary cap. This could be as large as TPM_BUFSIZE - 18 |
281 | * bytes, but 128 is still a relatively large number of random bytes and | |
282 | * anything much bigger causes users of struct tpm_cmd_t to start getting | |
283 | * compiler warnings about stack frame size. */ | |
284 | #define TPM_MAX_RNG_DATA 128 | |
285 | ||
286 | struct tpm_getrandom_out { | |
287 | __be32 rng_data_len; | |
288 | u8 rng_data[TPM_MAX_RNG_DATA]; | |
289 | }__attribute__((packed)); | |
290 | ||
291 | struct tpm_getrandom_in { | |
292 | __be32 num_bytes; | |
293 | }__attribute__((packed)); | |
294 | ||
c584af19 JG |
295 | struct tpm_startup_in { |
296 | __be16 startup_type; | |
297 | } __packed; | |
298 | ||
08837438 RA |
299 | typedef union { |
300 | struct tpm_getcap_params_out getcap_out; | |
301 | struct tpm_readpubek_params_out readpubek_out; | |
302 | u8 readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)]; | |
303 | struct tpm_getcap_params_in getcap_in; | |
659aaf2b RA |
304 | struct tpm_pcrread_in pcrread_in; |
305 | struct tpm_pcrread_out pcrread_out; | |
306 | struct tpm_pcrextend_in pcrextend_in; | |
41ab999c KY |
307 | struct tpm_getrandom_in getrandom_in; |
308 | struct tpm_getrandom_out getrandom_out; | |
c584af19 | 309 | struct tpm_startup_in startup_in; |
08837438 RA |
310 | } tpm_cmd_params; |
311 | ||
312 | struct tpm_cmd_t { | |
313 | tpm_cmd_header header; | |
314 | tpm_cmd_params params; | |
315 | }__attribute__((packed)); | |
316 | ||
317 | ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *); | |
1da177e4 | 318 | |
2b30a90f | 319 | extern int tpm_get_timeouts(struct tpm_chip *); |
08e96e48 | 320 | extern void tpm_gen_interrupt(struct tpm_chip *); |
68d6e671 | 321 | extern int tpm_do_selftest(struct tpm_chip *); |
9e18ee19 | 322 | extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32); |
e0dd03ca KJH |
323 | extern struct tpm_chip* tpm_register_hardware(struct device *, |
324 | const struct tpm_vendor_specific *); | |
1da177e4 LT |
325 | extern int tpm_open(struct inode *, struct file *); |
326 | extern int tpm_release(struct inode *, struct file *); | |
253115b7 | 327 | extern void tpm_dev_vendor_release(struct tpm_chip *); |
1da177e4 LT |
328 | extern ssize_t tpm_write(struct file *, const char __user *, size_t, |
329 | loff_t *); | |
330 | extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *); | |
e659a3fe | 331 | extern void tpm_remove_hardware(struct device *); |
035e2ce8 | 332 | extern int tpm_pm_suspend(struct device *); |
ce2c87d4 | 333 | extern int tpm_pm_resume(struct device *); |
fd048866 RA |
334 | extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long, |
335 | wait_queue_head_t *); | |
f84fdff0 XZ |
336 | |
337 | #ifdef CONFIG_ACPI | |
1631cfb7 GW |
338 | extern int tpm_add_ppi(struct kobject *); |
339 | extern void tpm_remove_ppi(struct kobject *); | |
f84fdff0 | 340 | #else |
1631cfb7 | 341 | static inline int tpm_add_ppi(struct kobject *parent) |
f84fdff0 XZ |
342 | { |
343 | return 0; | |
344 | } | |
1631cfb7 GW |
345 | |
346 | static inline void tpm_remove_ppi(struct kobject *parent) | |
347 | { | |
348 | } | |
f84fdff0 | 349 | #endif |