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
66 struct tpm_vendor_specific {
69 bool (*req_canceled)(struct tpm_chip *chip, u8 status);
70 void __iomem *iobase; /* ioremapped address */
71 unsigned long base; /* TPM base address */
79 int (*recv) (struct tpm_chip *, u8 *, size_t);
80 int (*send) (struct tpm_chip *, u8 *, size_t);
81 void (*cancel) (struct tpm_chip *);
82 u8 (*status) (struct tpm_chip *);
83 void (*release) (struct device *);
84 struct miscdevice miscdev;
85 struct list_head list;
87 unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
88 bool timeout_adjusted;
89 unsigned long duration[3]; /* jiffies */
90 bool duration_adjusted;
93 wait_queue_head_t read_queue;
94 wait_queue_head_t int_queue;
99 #define TPM_VPRIV(c) (c)->vendor.priv
101 #define TPM_VID_INTEL 0x8086
102 #define TPM_VID_WINBOND 0x1050
103 #define TPM_VID_STM 0x104A
106 struct device *dev; /* Device stuff */
108 int dev_num; /* /dev/tpm# */
110 unsigned long is_open; /* only one allowed */
113 /* Data passed to and from the tpm via the read/write calls */
115 atomic_t data_pending;
116 struct mutex buffer_mutex;
118 struct timer_list user_read_timer; /* user needs to claim result */
119 struct work_struct work;
120 struct mutex tpm_mutex; /* tpm is processing */
122 struct tpm_vendor_specific vendor;
124 struct dentry **bios_dir;
126 struct list_head list;
127 void (*release) (struct device *);
130 #define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)
132 static inline void tpm_chip_put(struct tpm_chip *chip)
134 module_put(chip->dev->driver->owner);
137 static inline int tpm_read_index(int base, int index)
140 return inb(base+1) & 0xFF;
143 static inline void tpm_write_index(int base, int index, int value)
146 outb(value & 0xFF, base+1);
148 struct tpm_input_header {
154 struct tpm_output_header {
160 #define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
162 struct stclear_flags_t {
165 u8 disableForceClear;
167 u8 physicalPresenceLock;
171 struct tpm_version_t {
178 struct tpm_version_1_2_t {
199 struct permanent_flags_t {
205 u8 disableOwnerClear;
207 u8 physicalPresenceLifetimeLock;
208 u8 physicalPresenceHWEnable;
209 u8 physicalPresenceCMDEnable;
220 u8 disableFullDALogicInfo;
224 struct permanent_flags_t perm_flags;
225 struct stclear_flags_t stclear_flags;
228 struct tpm_version_t tpm_version;
229 struct tpm_version_1_2_t tpm_version_1_2;
230 __be32 manufacturer_id;
231 struct timeout_t timeout;
232 struct duration_t duration;
235 enum tpm_capabilities {
236 TPM_CAP_FLAG = cpu_to_be32(4),
237 TPM_CAP_PROP = cpu_to_be32(5),
238 CAP_VERSION_1_1 = cpu_to_be32(0x06),
239 CAP_VERSION_1_2 = cpu_to_be32(0x1A)
242 enum tpm_sub_capabilities {
243 TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
244 TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
245 TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
246 TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
247 TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
248 TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
249 TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
253 struct tpm_getcap_params_in {
259 struct tpm_getcap_params_out {
264 struct tpm_readpubek_params_out {
269 u8 parameters[12]; /*assuming RSA*/
276 struct tpm_input_header in;
277 struct tpm_output_header out;
280 struct tpm_pcrread_out {
281 u8 pcr_result[TPM_DIGEST_SIZE];
284 struct tpm_pcrread_in {
288 struct tpm_pcrextend_in {
290 u8 hash[TPM_DIGEST_SIZE];
293 /* 128 bytes is an arbitrary cap. This could be as large as TPM_BUFSIZE - 18
294 * bytes, but 128 is still a relatively large number of random bytes and
295 * anything much bigger causes users of struct tpm_cmd_t to start getting
296 * compiler warnings about stack frame size. */
297 #define TPM_MAX_RNG_DATA 128
299 struct tpm_getrandom_out {
301 u8 rng_data[TPM_MAX_RNG_DATA];
304 struct tpm_getrandom_in {
308 struct tpm_startup_in {
313 struct tpm_getcap_params_out getcap_out;
314 struct tpm_readpubek_params_out readpubek_out;
315 u8 readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
316 struct tpm_getcap_params_in getcap_in;
317 struct tpm_pcrread_in pcrread_in;
318 struct tpm_pcrread_out pcrread_out;
319 struct tpm_pcrextend_in pcrextend_in;
320 struct tpm_getrandom_in getrandom_in;
321 struct tpm_getrandom_out getrandom_out;
322 struct tpm_startup_in startup_in;
326 tpm_cmd_header header;
327 tpm_cmd_params params;
330 ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *);
332 ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
334 extern int tpm_get_timeouts(struct tpm_chip *);
335 extern void tpm_gen_interrupt(struct tpm_chip *);
336 extern int tpm_do_selftest(struct tpm_chip *);
337 extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
338 extern struct tpm_chip* tpm_register_hardware(struct device *,
339 const struct tpm_class_ops *ops);
340 extern void tpm_dev_vendor_release(struct tpm_chip *);
341 extern void tpm_remove_hardware(struct device *);
342 extern int tpm_pm_suspend(struct device *);
343 extern int tpm_pm_resume(struct device *);
344 extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long,
345 wait_queue_head_t *, bool);
347 int tpm_dev_add_device(struct tpm_chip *chip);
348 void tpm_dev_del_device(struct tpm_chip *chip);
349 int tpm_sysfs_add_device(struct tpm_chip *chip);
350 void tpm_sysfs_del_device(struct tpm_chip *chip);
352 int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
355 extern int tpm_add_ppi(struct kobject *);
356 extern void tpm_remove_ppi(struct kobject *);
358 static inline int tpm_add_ppi(struct kobject *parent)
363 static inline void tpm_remove_ppi(struct kobject *parent)