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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
Kent Yoder8e81cc12007-08-22 14:01:04 -070010 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 *
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/delay.h>
23#include <linux/fs.h>
Matthias Kaehlcked081d472007-05-08 00:32:02 -070024#include <linux/mutex.h>
Al Viro914e2632006-10-18 13:55:46 -040025#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/miscdevice.h>
Al Virobbc5b212005-11-01 15:14:05 +000027#include <linux/platform_device.h>
Andrew Morton276ad0c2006-03-25 03:07:35 -080028#include <linux/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Kylene Hall3122a882005-06-23 22:01:48 -070030enum tpm_timeout {
31 TPM_TIMEOUT = 5, /* msecs */
32};
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
34/* TPM addresses */
Kylene Hall3122a882005-06-23 22:01:48 -070035enum tpm_addr {
Kylene Jo Halldaacdfa2005-06-25 14:55:39 -070036 TPM_SUPERIO_ADDR = 0x2E,
Kylene Hall3122a882005-06-23 22:01:48 -070037 TPM_ADDR = 0x4E,
Kylene Hall3122a882005-06-23 22:01:48 -070038};
39
Kylene Hall6659ca22005-06-23 22:02:00 -070040extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr,
41 char *);
42extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr,
43 char *);
44extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr,
45 char *);
Kylene Jo Hall08e96e42006-04-22 02:37:50 -070046extern ssize_t tpm_show_caps_1_2(struct device *, struct device_attribute *attr,
47 char *);
Kylene Hall6659ca22005-06-23 22:02:00 -070048extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr,
49 const char *, size_t);
Kylene Jo Hall08e96e42006-04-22 02:37:50 -070050extern ssize_t tpm_show_enabled(struct device *, struct device_attribute *attr,
51 char *);
52extern ssize_t tpm_show_active(struct device *, struct device_attribute *attr,
53 char *);
54extern ssize_t tpm_show_owned(struct device *, struct device_attribute *attr,
55 char *);
56extern ssize_t tpm_show_temp_deactivated(struct device *,
57 struct device_attribute *attr, char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59struct tpm_chip;
60
61struct tpm_vendor_specific {
Kylene Jo Halle0dd03c2006-04-22 02:37:26 -070062 const u8 req_complete_mask;
63 const u8 req_complete_val;
64 const u8 req_canceled;
Kylene Jo Hallad5ea3c2005-11-13 16:07:41 -080065 void __iomem *iobase; /* ioremapped address */
66 unsigned long base; /* TPM base address */
67
Leendert van Doorn27084ef2006-04-22 02:38:03 -070068 int irq;
69
Kylene Jo Hallad5ea3c2005-11-13 16:07:41 -080070 int region_size;
71 int have_region;
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
73 int (*recv) (struct tpm_chip *, u8 *, size_t);
74 int (*send) (struct tpm_chip *, u8 *, size_t);
75 void (*cancel) (struct tpm_chip *);
Kylene Jo Hallb4ed3e32005-10-30 15:03:23 -080076 u8 (*status) (struct tpm_chip *);
Richard MUSIL5bd91f12008-02-06 01:37:02 -080077 void (*release) (struct device *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 struct miscdevice miscdev;
Kylene Hall6659ca22005-06-23 22:02:00 -070079 struct attribute_group *attr_group;
Leendert van Doorn27084ef2006-04-22 02:38:03 -070080 struct list_head list;
81 int locality;
Kylene Jo Hall36b20022006-04-22 02:38:19 -070082 unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
83 unsigned long duration[3]; /* jiffies */
Leendert van Doorn27084ef2006-04-22 02:38:03 -070084
85 wait_queue_head_t read_queue;
86 wait_queue_head_t int_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087};
88
89struct tpm_chip {
Kylene Jo Halle659a3f2005-10-30 15:03:24 -080090 struct device *dev; /* Device stuff */
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
92 int dev_num; /* /dev/tpm# */
93 int num_opens; /* only one allowed */
94 int time_expired;
95
96 /* Data passed to and from the tpm via the read/write calls */
97 u8 *data_buffer;
98 atomic_t data_pending;
Matthias Kaehlcked081d472007-05-08 00:32:02 -070099 struct mutex buffer_mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
101 struct timer_list user_read_timer; /* user needs to claim result */
Kylene Jo Hall09e12f92005-11-13 16:07:43 -0800102 struct work_struct work;
Matthias Kaehlcked081d472007-05-08 00:32:02 -0700103 struct mutex tpm_mutex; /* tpm is processing */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104
Kylene Jo Hall90dda522006-04-22 02:37:15 -0700105 struct tpm_vendor_specific vendor;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
Kylene Jo Hall55a82ab2006-01-08 01:03:15 -0800107 struct dentry **bios_dir;
108
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 struct list_head list;
Richard MUSIL5bd91f12008-02-06 01:37:02 -0800110 void (*release) (struct device *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111};
112
Leendert van Doorn27084ef2006-04-22 02:38:03 -0700113#define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)
114
Kylene Jo Halldaacdfa2005-06-25 14:55:39 -0700115static inline int tpm_read_index(int base, int index)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116{
Kylene Jo Halldaacdfa2005-06-25 14:55:39 -0700117 outb(index, base);
118 return inb(base+1) & 0xFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119}
120
Kylene Jo Halldaacdfa2005-06-25 14:55:39 -0700121static inline void tpm_write_index(int base, int index, int value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122{
Kylene Jo Halldaacdfa2005-06-25 14:55:39 -0700123 outb(index, base);
124 outb(value & 0xFF, base+1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125}
126
Kylene Jo Hall08e96e42006-04-22 02:37:50 -0700127extern void tpm_get_timeouts(struct tpm_chip *);
128extern void tpm_gen_interrupt(struct tpm_chip *);
129extern void tpm_continue_selftest(struct tpm_chip *);
Kylene Jo Hall9e18ee12006-04-22 02:37:38 -0700130extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
Kylene Jo Halle0dd03c2006-04-22 02:37:26 -0700131extern struct tpm_chip* tpm_register_hardware(struct device *,
132 const struct tpm_vendor_specific *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133extern int tpm_open(struct inode *, struct file *);
134extern int tpm_release(struct inode *, struct file *);
135extern ssize_t tpm_write(struct file *, const char __user *, size_t,
136 loff_t *);
137extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
Kylene Jo Halle659a3f2005-10-30 15:03:24 -0800138extern void tpm_remove_hardware(struct device *);
Kylene Jo Hallce2c87d2005-10-30 15:03:25 -0800139extern int tpm_pm_suspend(struct device *, pm_message_t);
140extern int tpm_pm_resume(struct device *);
Kylene Jo Hall55a82ab2006-01-08 01:03:15 -0800141
142#ifdef CONFIG_ACPI
143extern struct dentry ** tpm_bios_log_setup(char *);
144extern void tpm_bios_log_teardown(struct dentry **);
145#else
Daniel Walkerbb53a762006-05-15 09:44:27 -0700146static inline struct dentry ** tpm_bios_log_setup(char *name)
Kylene Jo Hall55a82ab2006-01-08 01:03:15 -0800147{
148 return NULL;
149}
150static inline void tpm_bios_log_teardown(struct dentry **dir)
151{
152}
153#endif