2 * Copyright (C) 2004 IBM Corporation
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>
10 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
12 * Device driver for TCG/TCPA TPM (trusted platform module).
13 * Specifications at www.trustedcomputinggroup.org
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
21 #include <linux/module.h>
22 #include <linux/delay.h>
24 #include <linux/mutex.h>
25 #include <linux/sched.h>
26 #include <linux/miscdevice.h>
27 #include <linux/platform_device.h>
29 #include <linux/tpm.h>
32 TPM_MINOR = 224, /* officially assigned */
34 TPM_NUM_DEVICES = 256,
35 TPM_RETRY = 50, /* 5 seconds */
39 TPM_TIMEOUT = 5, /* msecs */
40 TPM_TIMEOUT_RETRY = 100 /* msecs */
45 TPM_SUPERIO_ADDR = 0x2E,
49 #define TPM_WARN_RETRY 0x800
50 #define TPM_WARN_DOING_SELFTEST 0x802
51 #define TPM_ERR_DEACTIVATED 0x6
52 #define TPM_ERR_DISABLED 0x7
53 #define TPM_ERR_INVALID_POSTINIT 38
55 #define TPM_HEADER_SIZE 10
56 extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr,
58 extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr,
60 extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr,
62 extern ssize_t tpm_show_caps_1_2(struct device *, struct device_attribute *attr,
64 extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr,
65 const char *, size_t);
66 extern ssize_t tpm_show_enabled(struct device *, struct device_attribute *attr,
68 extern ssize_t tpm_show_active(struct device *, struct device_attribute *attr,
70 extern ssize_t tpm_show_owned(struct device *, struct device_attribute *attr,
72 extern ssize_t tpm_show_temp_deactivated(struct device *,
73 struct device_attribute *attr, char *);
74 extern ssize_t tpm_show_durations(struct device *,
75 struct device_attribute *attr, char *);
76 extern ssize_t tpm_show_timeouts(struct device *,
77 struct device_attribute *attr, char *);
81 struct tpm_vendor_specific {
82 const u8 req_complete_mask;
83 const u8 req_complete_val;
84 bool (*req_canceled)(struct tpm_chip *chip, u8 status);
85 void __iomem *iobase; /* ioremapped address */
86 unsigned long base; /* TPM base address */
94 int (*recv) (struct tpm_chip *, u8 *, size_t);
95 int (*send) (struct tpm_chip *, u8 *, size_t);
96 void (*cancel) (struct tpm_chip *);
97 u8 (*status) (struct tpm_chip *);
98 bool (*update_timeouts)(struct tpm_chip *chip,
99 unsigned long *timeout_cap);
101 void (*release) (struct device *);
102 struct miscdevice miscdev;
103 struct attribute_group *attr_group;
104 struct list_head list;
106 unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
107 bool timeout_adjusted;
108 unsigned long duration[3]; /* jiffies */
109 bool duration_adjusted;
112 wait_queue_head_t read_queue;
113 wait_queue_head_t int_queue;
118 #define TPM_VPRIV(c) (c)->vendor.priv
120 #define TPM_VID_INTEL 0x8086
121 #define TPM_VID_WINBOND 0x1050
122 #define TPM_VID_STM 0x104A
125 struct device *dev; /* Device stuff */
127 int dev_num; /* /dev/tpm# */
128 unsigned long is_open; /* only one allowed */
131 /* Data passed to and from the tpm via the read/write calls */
133 atomic_t data_pending;
134 struct mutex buffer_mutex;
136 struct timer_list user_read_timer; /* user needs to claim result */
137 struct work_struct work;
138 struct mutex tpm_mutex; /* tpm is processing */
140 struct tpm_vendor_specific vendor;
142 struct dentry **bios_dir;
144 struct list_head list;
145 void (*release) (struct device *);
148 #define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)
150 static inline void tpm_chip_put(struct tpm_chip *chip)
152 module_put(chip->dev->driver->owner);
155 static inline int tpm_read_index(int base, int index)
158 return inb(base+1) & 0xFF;
161 static inline void tpm_write_index(int base, int index, int value)
164 outb(value & 0xFF, base+1);
166 struct tpm_input_header {
172 struct tpm_output_header {
178 struct stclear_flags_t {
181 u8 disableForceClear;
183 u8 physicalPresenceLock;
187 struct tpm_version_t {
194 struct tpm_version_1_2_t {
215 struct permanent_flags_t {
221 u8 disableOwnerClear;
223 u8 physicalPresenceLifetimeLock;
224 u8 physicalPresenceHWEnable;
225 u8 physicalPresenceCMDEnable;
236 u8 disableFullDALogicInfo;
240 struct permanent_flags_t perm_flags;
241 struct stclear_flags_t stclear_flags;
244 struct tpm_version_t tpm_version;
245 struct tpm_version_1_2_t tpm_version_1_2;
246 __be32 manufacturer_id;
247 struct timeout_t timeout;
248 struct duration_t duration;
251 struct tpm_getcap_params_in {
257 struct tpm_getcap_params_out {
262 struct tpm_readpubek_params_out {
267 u8 parameters[12]; /*assuming RSA*/
274 struct tpm_input_header in;
275 struct tpm_output_header out;
278 #define TPM_DIGEST_SIZE 20
279 struct tpm_pcrread_out {
280 u8 pcr_result[TPM_DIGEST_SIZE];
283 struct tpm_pcrread_in {
287 struct tpm_pcrextend_in {
289 u8 hash[TPM_DIGEST_SIZE];
292 /* 128 bytes is an arbitrary cap. This could be as large as TPM_BUFSIZE - 18
293 * bytes, but 128 is still a relatively large number of random bytes and
294 * anything much bigger causes users of struct tpm_cmd_t to start getting
295 * compiler warnings about stack frame size. */
296 #define TPM_MAX_RNG_DATA 128
298 struct tpm_getrandom_out {
300 u8 rng_data[TPM_MAX_RNG_DATA];
303 struct tpm_getrandom_in {
307 struct tpm_startup_in {
312 struct tpm_getcap_params_out getcap_out;
313 struct tpm_readpubek_params_out readpubek_out;
314 u8 readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
315 struct tpm_getcap_params_in getcap_in;
316 struct tpm_pcrread_in pcrread_in;
317 struct tpm_pcrread_out pcrread_out;
318 struct tpm_pcrextend_in pcrextend_in;
319 struct tpm_getrandom_in getrandom_in;
320 struct tpm_getrandom_out getrandom_out;
321 struct tpm_startup_in startup_in;
325 tpm_cmd_header header;
326 tpm_cmd_params params;
329 ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *);
331 extern int tpm_get_timeouts(struct tpm_chip *);
332 extern void tpm_gen_interrupt(struct tpm_chip *);
333 extern int tpm_do_selftest(struct tpm_chip *);
334 extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
335 extern struct tpm_chip* tpm_register_hardware(struct device *,
336 const struct tpm_vendor_specific *);
337 extern int tpm_open(struct inode *, struct file *);
338 extern int tpm_release(struct inode *, struct file *);
339 extern void tpm_dev_vendor_release(struct tpm_chip *);
340 extern ssize_t tpm_write(struct file *, const char __user *, size_t,
342 extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
343 extern void tpm_remove_hardware(struct device *);
344 extern int tpm_pm_suspend(struct device *);
345 extern int tpm_pm_resume(struct device *);
346 extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long,
347 wait_queue_head_t *, bool);
350 extern int tpm_add_ppi(struct kobject *);
351 extern void tpm_remove_ppi(struct kobject *);
353 static inline int tpm_add_ppi(struct kobject *parent)
358 static inline void tpm_remove_ppi(struct kobject *parent)