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
30 enum tpm_timeout {
31 TPM_TIMEOUT = 5, /* msecs */
32 };
33
34 /* TPM addresses */
35 enum tpm_addr {
36 TPM_SUPERIO_ADDR = 0x2E,
37 TPM_ADDR = 0x4E,
38 };
39
40 extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr,
41 char *);
42 extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr,
43 char *);
44 extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr,
45 char *);
46 extern ssize_t tpm_show_caps_1_2(struct device *, struct device_attribute *attr,
47 char *);
48 extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr,
49 const char *, size_t);
50 extern ssize_t tpm_show_enabled(struct device *, struct device_attribute *attr,
51 char *);
52 extern ssize_t tpm_show_active(struct device *, struct device_attribute *attr,
53 char *);
54 extern ssize_t tpm_show_owned(struct device *, struct device_attribute *attr,
55 char *);
56 extern ssize_t tpm_show_temp_deactivated(struct device *,
57 struct device_attribute *attr, char *);
58
59 struct tpm_chip;
60
61 struct tpm_vendor_specific {
62 const u8 req_complete_mask;
63 const u8 req_complete_val;
64 const u8 req_canceled;
65 void __iomem *iobase; /* ioremapped address */
66 unsigned long base; /* TPM base address */
67
68 int irq;
69
70 int region_size;
71 int have_region;
72
73 int (*recv) (struct tpm_chip *, u8 *, size_t);
74 int (*send) (struct tpm_chip *, u8 *, size_t);
75 void (*cancel) (struct tpm_chip *);
76 u8 (*status) (struct tpm_chip *);
77 void (*release) (struct device *);
78 struct miscdevice miscdev;
79 struct attribute_group *attr_group;
80 struct list_head list;
81 int locality;
82 unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
83 unsigned long duration[3]; /* jiffies */
84
85 wait_queue_head_t read_queue;
86 wait_queue_head_t int_queue;
87 };
88
89 struct tpm_chip {
90 struct device *dev; /* Device stuff */
91
92 int dev_num; /* /dev/tpm# */
93 unsigned long is_open; /* 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;
99 struct mutex buffer_mutex;
100
101 struct timer_list user_read_timer; /* user needs to claim result */
102 struct work_struct work;
103 struct mutex tpm_mutex; /* tpm is processing */
104
105 struct tpm_vendor_specific vendor;
106
107 struct dentry **bios_dir;
108
109 struct list_head list;
110 void (*release) (struct device *);
111 };
112
113 #define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)
114
tpm_read_index(int base,int index)115 static inline int tpm_read_index(int base, int index)
116 {
117 outb(index, base);
118 return inb(base+1) & 0xFF;
119 }
120
tpm_write_index(int base,int index,int value)121 static inline void tpm_write_index(int base, int index, int value)
122 {
123 outb(index, base);
124 outb(value & 0xFF, base+1);
125 }
126
127 extern void tpm_get_timeouts(struct tpm_chip *);
128 extern void tpm_gen_interrupt(struct tpm_chip *);
129 extern void tpm_continue_selftest(struct tpm_chip *);
130 extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
131 extern struct tpm_chip* tpm_register_hardware(struct device *,
132 const struct tpm_vendor_specific *);
133 extern int tpm_open(struct inode *, struct file *);
134 extern int tpm_release(struct inode *, struct file *);
135 extern void tpm_dev_vendor_release(struct tpm_chip *);
136 extern ssize_t tpm_write(struct file *, const char __user *, size_t,
137 loff_t *);
138 extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
139 extern void tpm_remove_hardware(struct device *);
140 extern int tpm_pm_suspend(struct device *, pm_message_t);
141 extern int tpm_pm_resume(struct device *);
142
143 #ifdef CONFIG_ACPI
144 extern struct dentry ** tpm_bios_log_setup(char *);
145 extern void tpm_bios_log_teardown(struct dentry **);
146 #else
tpm_bios_log_setup(char * name)147 static inline struct dentry ** tpm_bios_log_setup(char *name)
148 {
149 return NULL;
150 }
tpm_bios_log_teardown(struct dentry ** dir)151 static inline void tpm_bios_log_teardown(struct dentry **dir)
152 {
153 }
154 #endif
155