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 /* Indexes the duration array */
57 #define TPM_WARN_RETRY 0x800
58 #define TPM_WARN_DOING_SELFTEST 0x802
59 #define TPM_ERR_DEACTIVATED 0x6
60 #define TPM_ERR_DISABLED 0x7
61 #define TPM_ERR_INVALID_POSTINIT 38
63 #define TPM_HEADER_SIZE 10
64 extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr,
66 extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr,
68 extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr,
70 extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr,
71 const char *, size_t);
72 extern ssize_t tpm_show_enabled(struct device *, struct device_attribute *attr,
74 extern ssize_t tpm_show_active(struct device *, struct device_attribute *attr,
76 extern ssize_t tpm_show_owned(struct device *, struct device_attribute *attr,
78 extern ssize_t tpm_show_temp_deactivated(struct device *,
79 struct device_attribute *attr, char *);
80 extern ssize_t tpm_show_durations(struct device *,
81 struct device_attribute *attr, char *);
82 extern ssize_t tpm_show_timeouts(struct device *,
83 struct device_attribute *attr, char *);
87 struct tpm_vendor_specific {
88 const u8 req_complete_mask;
89 const u8 req_complete_val;
90 bool (*req_canceled)(struct tpm_chip *chip, u8 status);
91 void __iomem *iobase; /* ioremapped address */
92 unsigned long base; /* TPM base address */
100 int (*recv) (struct tpm_chip *, u8 *, size_t);
101 int (*send) (struct tpm_chip *, u8 *, size_t);
102 void (*cancel) (struct tpm_chip *);
103 u8 (*status) (struct tpm_chip *);
104 void (*release) (struct device *);
105 struct miscdevice miscdev;
106 struct attribute_group *attr_group;
107 struct list_head list;
109 unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
110 bool timeout_adjusted;
111 unsigned long duration[3]; /* jiffies */
112 bool duration_adjusted;
115 wait_queue_head_t read_queue;
116 wait_queue_head_t int_queue;
121 #define TPM_VPRIV(c) (c)->vendor.priv
123 #define TPM_VID_INTEL 0x8086
124 #define TPM_VID_WINBOND 0x1050
125 #define TPM_VID_STM 0x104A
128 struct device *dev; /* Device stuff */
130 int dev_num; /* /dev/tpm# */
132 unsigned long is_open; /* only one allowed */
135 /* Data passed to and from the tpm via the read/write calls */
137 atomic_t data_pending;
138 struct mutex buffer_mutex;
140 struct timer_list user_read_timer; /* user needs to claim result */
141 struct work_struct work;
142 struct mutex tpm_mutex; /* tpm is processing */
144 struct tpm_vendor_specific vendor;
146 struct dentry **bios_dir;
148 struct list_head list;
149 void (*release) (struct device *);
152 #define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)
154 static inline void tpm_chip_put(struct tpm_chip *chip)
156 module_put(chip->dev->driver->owner);
159 static inline int tpm_read_index(int base, int index)
162 return inb(base+1) & 0xFF;
165 static inline void tpm_write_index(int base, int index, int value)
168 outb(value & 0xFF, base+1);
170 struct tpm_input_header {
176 struct tpm_output_header {
182 #define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
184 struct stclear_flags_t {
187 u8 disableForceClear;
189 u8 physicalPresenceLock;
193 struct tpm_version_t {
200 struct tpm_version_1_2_t {
221 struct permanent_flags_t {
227 u8 disableOwnerClear;
229 u8 physicalPresenceLifetimeLock;
230 u8 physicalPresenceHWEnable;
231 u8 physicalPresenceCMDEnable;
242 u8 disableFullDALogicInfo;
246 struct permanent_flags_t perm_flags;
247 struct stclear_flags_t stclear_flags;
250 struct tpm_version_t tpm_version;
251 struct tpm_version_1_2_t tpm_version_1_2;
252 __be32 manufacturer_id;
253 struct timeout_t timeout;
254 struct duration_t duration;
257 enum tpm_capabilities {
258 TPM_CAP_FLAG = cpu_to_be32(4),
259 TPM_CAP_PROP = cpu_to_be32(5),
260 CAP_VERSION_1_1 = cpu_to_be32(0x06),
261 CAP_VERSION_1_2 = cpu_to_be32(0x1A)
264 enum tpm_sub_capabilities {
265 TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
266 TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
267 TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
268 TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
269 TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
270 TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
271 TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
275 struct tpm_getcap_params_in {
281 struct tpm_getcap_params_out {
286 struct tpm_readpubek_params_out {
291 u8 parameters[12]; /*assuming RSA*/
298 struct tpm_input_header in;
299 struct tpm_output_header out;
302 struct tpm_pcrread_out {
303 u8 pcr_result[TPM_DIGEST_SIZE];
306 struct tpm_pcrread_in {
310 struct tpm_pcrextend_in {
312 u8 hash[TPM_DIGEST_SIZE];
315 /* 128 bytes is an arbitrary cap. This could be as large as TPM_BUFSIZE - 18
316 * bytes, but 128 is still a relatively large number of random bytes and
317 * anything much bigger causes users of struct tpm_cmd_t to start getting
318 * compiler warnings about stack frame size. */
319 #define TPM_MAX_RNG_DATA 128
321 struct tpm_getrandom_out {
323 u8 rng_data[TPM_MAX_RNG_DATA];
326 struct tpm_getrandom_in {
330 struct tpm_startup_in {
335 struct tpm_getcap_params_out getcap_out;
336 struct tpm_readpubek_params_out readpubek_out;
337 u8 readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
338 struct tpm_getcap_params_in getcap_in;
339 struct tpm_pcrread_in pcrread_in;
340 struct tpm_pcrread_out pcrread_out;
341 struct tpm_pcrextend_in pcrextend_in;
342 struct tpm_getrandom_in getrandom_in;
343 struct tpm_getrandom_out getrandom_out;
344 struct tpm_startup_in startup_in;
348 tpm_cmd_header header;
349 tpm_cmd_params params;
352 ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *);
354 ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
356 extern int tpm_get_timeouts(struct tpm_chip *);
357 extern void tpm_gen_interrupt(struct tpm_chip *);
358 extern int tpm_do_selftest(struct tpm_chip *);
359 extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
360 extern struct tpm_chip* tpm_register_hardware(struct device *,
361 const struct tpm_vendor_specific *);
362 extern void tpm_dev_vendor_release(struct tpm_chip *);
363 extern void tpm_remove_hardware(struct device *);
364 extern int tpm_pm_suspend(struct device *);
365 extern int tpm_pm_resume(struct device *);
366 extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long,
367 wait_queue_head_t *, bool);
369 int tpm_dev_add_device(struct tpm_chip *chip);
370 void tpm_dev_del_device(struct tpm_chip *chip);
372 int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
375 extern int tpm_add_ppi(struct kobject *);
376 extern void tpm_remove_ppi(struct kobject *);
378 static inline int tpm_add_ppi(struct kobject *parent)
383 static inline void tpm_remove_ppi(struct kobject *parent)