tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 *
10 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
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>
22#include <linux/delay.h>
23#include <linux/fs.h>
24#include <linux/mutex.h>
25#include <linux/sched.h>
26#include <linux/miscdevice.h>
27#include <linux/platform_device.h>
28#include <linux/io.h>
29#include <linux/tpm.h>
30
31enum tpm_timeout {
32 TPM_TIMEOUT = 5, /* msecs */
33};
34
35/* TPM addresses */
36enum tpm_addr {
37 TPM_SUPERIO_ADDR = 0x2E,
38 TPM_ADDR = 0x4E,
39};
40
41#define TPM_WARN_DOING_SELFTEST 0x802
42#define TPM_ERR_DEACTIVATED 0x6
43#define TPM_ERR_DISABLED 0x7
44
45#define TPM_HEADER_SIZE 10
46extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr,
47 char *);
48extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr,
49 char *);
50extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr,
51 char *);
52extern ssize_t tpm_show_caps_1_2(struct device *, struct device_attribute *attr,
53 char *);
54extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr,
55 const char *, size_t);
56extern ssize_t tpm_show_enabled(struct device *, struct device_attribute *attr,
57 char *);
58extern ssize_t tpm_show_active(struct device *, struct device_attribute *attr,
59 char *);
60extern ssize_t tpm_show_owned(struct device *, struct device_attribute *attr,
61 char *);
62extern ssize_t tpm_show_temp_deactivated(struct device *,
63 struct device_attribute *attr, char *);
64extern ssize_t tpm_show_durations(struct device *,
65 struct device_attribute *attr, char *);
66extern ssize_t tpm_show_timeouts(struct device *,
67 struct device_attribute *attr, char *);
68
69struct tpm_chip;
70
71struct tpm_vendor_specific {
72 const u8 req_complete_mask;
73 const u8 req_complete_val;
74 const u8 req_canceled;
75 void __iomem *iobase; /* ioremapped address */
76 unsigned long base; /* TPM base address */
77
78 int irq;
79 int probed_irq;
80
81 int region_size;
82 int have_region;
83
84 int (*recv) (struct tpm_chip *, u8 *, size_t);
85 int (*send) (struct tpm_chip *, u8 *, size_t);
86 void (*cancel) (struct tpm_chip *);
87 u8 (*status) (struct tpm_chip *);
88 void (*release) (struct device *);
89 struct miscdevice miscdev;
90 struct attribute_group *attr_group;
91 struct list_head list;
92 int locality;
93 unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
94 bool timeout_adjusted;
95 unsigned long duration[3]; /* jiffies */
96 bool duration_adjusted;
97
98 wait_queue_head_t read_queue;
99 wait_queue_head_t int_queue;
100};
101
102struct tpm_chip {
103 struct device *dev; /* Device stuff */
104
105 int dev_num; /* /dev/tpm# */
106 unsigned long is_open; /* only one allowed */
107 int time_expired;
108
109 /* Data passed to and from the tpm via the read/write calls */
110 u8 *data_buffer;
111 atomic_t data_pending;
112 struct mutex buffer_mutex;
113
114 struct timer_list user_read_timer; /* user needs to claim result */
115 struct work_struct work;
116 struct mutex tpm_mutex; /* tpm is processing */
117
118 struct tpm_vendor_specific vendor;
119
120 struct dentry **bios_dir;
121
122 struct list_head list;
123 void (*release) (struct device *);
124};
125
126#define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)
127
128static inline void tpm_chip_put(struct tpm_chip *chip)
129{
130 module_put(chip->dev->driver->owner);
131}
132
133static inline int tpm_read_index(int base, int index)
134{
135 outb(index, base);
136 return inb(base+1) & 0xFF;
137}
138
139static inline void tpm_write_index(int base, int index, int value)
140{
141 outb(index, base);
142 outb(value & 0xFF, base+1);
143}
144struct tpm_input_header {
145 __be16 tag;
146 __be32 length;
147 __be32 ordinal;
148}__attribute__((packed));
149
150struct tpm_output_header {
151 __be16 tag;
152 __be32 length;
153 __be32 return_code;
154}__attribute__((packed));
155
156struct stclear_flags_t {
157 __be16 tag;
158 u8 deactivated;
159 u8 disableForceClear;
160 u8 physicalPresence;
161 u8 physicalPresenceLock;
162 u8 bGlobalLock;
163}__attribute__((packed));
164
165struct tpm_version_t {
166 u8 Major;
167 u8 Minor;
168 u8 revMajor;
169 u8 revMinor;
170}__attribute__((packed));
171
172struct tpm_version_1_2_t {
173 __be16 tag;
174 u8 Major;
175 u8 Minor;
176 u8 revMajor;
177 u8 revMinor;
178}__attribute__((packed));
179
180struct timeout_t {
181 __be32 a;
182 __be32 b;
183 __be32 c;
184 __be32 d;
185}__attribute__((packed));
186
187struct duration_t {
188 __be32 tpm_short;
189 __be32 tpm_medium;
190 __be32 tpm_long;
191}__attribute__((packed));
192
193struct permanent_flags_t {
194 __be16 tag;
195 u8 disable;
196 u8 ownership;
197 u8 deactivated;
198 u8 readPubek;
199 u8 disableOwnerClear;
200 u8 allowMaintenance;
201 u8 physicalPresenceLifetimeLock;
202 u8 physicalPresenceHWEnable;
203 u8 physicalPresenceCMDEnable;
204 u8 CEKPUsed;
205 u8 TPMpost;
206 u8 TPMpostLock;
207 u8 FIPS;
208 u8 operator;
209 u8 enableRevokeEK;
210 u8 nvLocked;
211 u8 readSRKPub;
212 u8 tpmEstablished;
213 u8 maintenanceDone;
214 u8 disableFullDALogicInfo;
215}__attribute__((packed));
216
217typedef union {
218 struct permanent_flags_t perm_flags;
219 struct stclear_flags_t stclear_flags;
220 bool owned;
221 __be32 num_pcrs;
222 struct tpm_version_t tpm_version;
223 struct tpm_version_1_2_t tpm_version_1_2;
224 __be32 manufacturer_id;
225 struct timeout_t timeout;
226 struct duration_t duration;
227} cap_t;
228
229struct tpm_getcap_params_in {
230 __be32 cap;
231 __be32 subcap_size;
232 __be32 subcap;
233}__attribute__((packed));
234
235struct tpm_getcap_params_out {
236 __be32 cap_size;
237 cap_t cap;
238}__attribute__((packed));
239
240struct tpm_readpubek_params_out {
241 u8 algorithm[4];
242 u8 encscheme[2];
243 u8 sigscheme[2];
244 __be32 paramsize;
245 u8 parameters[12]; /*assuming RSA*/
246 __be32 keysize;
247 u8 modulus[256];
248 u8 checksum[20];
249}__attribute__((packed));
250
251typedef union {
252 struct tpm_input_header in;
253 struct tpm_output_header out;
254} tpm_cmd_header;
255
256#define TPM_DIGEST_SIZE 20
257struct tpm_pcrread_out {
258 u8 pcr_result[TPM_DIGEST_SIZE];
259}__attribute__((packed));
260
261struct tpm_pcrread_in {
262 __be32 pcr_idx;
263}__attribute__((packed));
264
265struct tpm_pcrextend_in {
266 __be32 pcr_idx;
267 u8 hash[TPM_DIGEST_SIZE];
268}__attribute__((packed));
269
270typedef union {
271 struct tpm_getcap_params_out getcap_out;
272 struct tpm_readpubek_params_out readpubek_out;
273 u8 readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
274 struct tpm_getcap_params_in getcap_in;
275 struct tpm_pcrread_in pcrread_in;
276 struct tpm_pcrread_out pcrread_out;
277 struct tpm_pcrextend_in pcrextend_in;
278} tpm_cmd_params;
279
280struct tpm_cmd_t {
281 tpm_cmd_header header;
282 tpm_cmd_params params;
283}__attribute__((packed));
284
285ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *);
286
287extern int tpm_get_timeouts(struct tpm_chip *);
288extern void tpm_gen_interrupt(struct tpm_chip *);
289extern int tpm_do_selftest(struct tpm_chip *);
290extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
291extern struct tpm_chip* tpm_register_hardware(struct device *,
292 const struct tpm_vendor_specific *);
293extern int tpm_open(struct inode *, struct file *);
294extern int tpm_release(struct inode *, struct file *);
295extern void tpm_dev_vendor_release(struct tpm_chip *);
296extern ssize_t tpm_write(struct file *, const char __user *, size_t,
297 loff_t *);
298extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
299extern void tpm_remove_hardware(struct device *);
300extern int tpm_pm_suspend(struct device *, pm_message_t);
301extern int tpm_pm_resume(struct device *);
302extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long,
303 wait_queue_head_t *);
304#ifdef CONFIG_ACPI
305extern struct dentry ** tpm_bios_log_setup(char *);
306extern void tpm_bios_log_teardown(struct dentry **);
307#else
308static inline struct dentry ** tpm_bios_log_setup(char *name)
309{
310 return NULL;
311}
312static inline void tpm_bios_log_teardown(struct dentry **dir)
313{
314}
315#endif