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
102#define TPM_VID_INTEL 0x8086
103
104struct tpm_chip {
105 struct device *dev; /* Device stuff */
106
107 int dev_num; /* /dev/tpm# */
108 unsigned long is_open; /* only one allowed */
109 int time_expired;
110
111 /* Data passed to and from the tpm via the read/write calls */
112 u8 *data_buffer;
113 atomic_t data_pending;
114 struct mutex buffer_mutex;
115
116 struct timer_list user_read_timer; /* user needs to claim result */
117 struct work_struct work;
118 struct mutex tpm_mutex; /* tpm is processing */
119
120 struct tpm_vendor_specific vendor;
121
122 struct dentry **bios_dir;
123
124 struct list_head list;
125 void (*release) (struct device *);
126};
127
128#define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)
129
130static inline void tpm_chip_put(struct tpm_chip *chip)
131{
132 module_put(chip->dev->driver->owner);
133}
134
135static inline int tpm_read_index(int base, int index)
136{
137 outb(index, base);
138 return inb(base+1) & 0xFF;
139}
140
141static inline void tpm_write_index(int base, int index, int value)
142{
143 outb(index, base);
144 outb(value & 0xFF, base+1);
145}
146struct tpm_input_header {
147 __be16 tag;
148 __be32 length;
149 __be32 ordinal;
150}__attribute__((packed));
151
152struct tpm_output_header {
153 __be16 tag;
154 __be32 length;
155 __be32 return_code;
156}__attribute__((packed));
157
158struct stclear_flags_t {
159 __be16 tag;
160 u8 deactivated;
161 u8 disableForceClear;
162 u8 physicalPresence;
163 u8 physicalPresenceLock;
164 u8 bGlobalLock;
165}__attribute__((packed));
166
167struct tpm_version_t {
168 u8 Major;
169 u8 Minor;
170 u8 revMajor;
171 u8 revMinor;
172}__attribute__((packed));
173
174struct tpm_version_1_2_t {
175 __be16 tag;
176 u8 Major;
177 u8 Minor;
178 u8 revMajor;
179 u8 revMinor;
180}__attribute__((packed));
181
182struct timeout_t {
183 __be32 a;
184 __be32 b;
185 __be32 c;
186 __be32 d;
187}__attribute__((packed));
188
189struct duration_t {
190 __be32 tpm_short;
191 __be32 tpm_medium;
192 __be32 tpm_long;
193}__attribute__((packed));
194
195struct permanent_flags_t {
196 __be16 tag;
197 u8 disable;
198 u8 ownership;
199 u8 deactivated;
200 u8 readPubek;
201 u8 disableOwnerClear;
202 u8 allowMaintenance;
203 u8 physicalPresenceLifetimeLock;
204 u8 physicalPresenceHWEnable;
205 u8 physicalPresenceCMDEnable;
206 u8 CEKPUsed;
207 u8 TPMpost;
208 u8 TPMpostLock;
209 u8 FIPS;
210 u8 operator;
211 u8 enableRevokeEK;
212 u8 nvLocked;
213 u8 readSRKPub;
214 u8 tpmEstablished;
215 u8 maintenanceDone;
216 u8 disableFullDALogicInfo;
217}__attribute__((packed));
218
219typedef union {
220 struct permanent_flags_t perm_flags;
221 struct stclear_flags_t stclear_flags;
222 bool owned;
223 __be32 num_pcrs;
224 struct tpm_version_t tpm_version;
225 struct tpm_version_1_2_t tpm_version_1_2;
226 __be32 manufacturer_id;
227 struct timeout_t timeout;
228 struct duration_t duration;
229} cap_t;
230
231struct tpm_getcap_params_in {
232 __be32 cap;
233 __be32 subcap_size;
234 __be32 subcap;
235}__attribute__((packed));
236
237struct tpm_getcap_params_out {
238 __be32 cap_size;
239 cap_t cap;
240}__attribute__((packed));
241
242struct tpm_readpubek_params_out {
243 u8 algorithm[4];
244 u8 encscheme[2];
245 u8 sigscheme[2];
246 __be32 paramsize;
247 u8 parameters[12]; /*assuming RSA*/
248 __be32 keysize;
249 u8 modulus[256];
250 u8 checksum[20];
251}__attribute__((packed));
252
253typedef union {
254 struct tpm_input_header in;
255 struct tpm_output_header out;
256} tpm_cmd_header;
257
258#define TPM_DIGEST_SIZE 20
259struct tpm_pcrread_out {
260 u8 pcr_result[TPM_DIGEST_SIZE];
261}__attribute__((packed));
262
263struct tpm_pcrread_in {
264 __be32 pcr_idx;
265}__attribute__((packed));
266
267struct tpm_pcrextend_in {
268 __be32 pcr_idx;
269 u8 hash[TPM_DIGEST_SIZE];
270}__attribute__((packed));
271
272typedef union {
273 struct tpm_getcap_params_out getcap_out;
274 struct tpm_readpubek_params_out readpubek_out;
275 u8 readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
276 struct tpm_getcap_params_in getcap_in;
277 struct tpm_pcrread_in pcrread_in;
278 struct tpm_pcrread_out pcrread_out;
279 struct tpm_pcrextend_in pcrextend_in;
280} tpm_cmd_params;
281
282struct tpm_cmd_t {
283 tpm_cmd_header header;
284 tpm_cmd_params params;
285}__attribute__((packed));
286
287ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *);
288
289extern int tpm_get_timeouts(struct tpm_chip *);
290extern void tpm_gen_interrupt(struct tpm_chip *);
291extern int tpm_do_selftest(struct tpm_chip *);
292extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
293extern struct tpm_chip* tpm_register_hardware(struct device *,
294 const struct tpm_vendor_specific *);
295extern int tpm_open(struct inode *, struct file *);
296extern int tpm_release(struct inode *, struct file *);
297extern void tpm_dev_vendor_release(struct tpm_chip *);
298extern ssize_t tpm_write(struct file *, const char __user *, size_t,
299 loff_t *);
300extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
301extern void tpm_remove_hardware(struct device *);
302extern int tpm_pm_suspend(struct device *, pm_message_t);
303extern int tpm_pm_resume(struct device *);
304extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long,
305 wait_queue_head_t *);
306#ifdef CONFIG_ACPI
307extern struct dentry ** tpm_bios_log_setup(char *);
308extern void tpm_bios_log_teardown(struct dentry **);
309#else
310static inline struct dentry ** tpm_bios_log_setup(char *name)
311{
312 return NULL;
313}
314static inline void tpm_bios_log_teardown(struct dentry **dir)
315{
316}
317#endif