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1da177e4 LT |
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> | |
1da177e4 LT |
22 | #include <linux/pci.h> |
23 | #include <linux/delay.h> | |
24 | #include <linux/fs.h> | |
25 | #include <linux/miscdevice.h> | |
bbc5b212 | 26 | #include <linux/platform_device.h> |
276ad0c1 | 27 | #include <linux/io.h> |
1da177e4 | 28 | |
3122a88a KH |
29 | enum tpm_timeout { |
30 | TPM_TIMEOUT = 5, /* msecs */ | |
31 | }; | |
1da177e4 LT |
32 | |
33 | /* TPM addresses */ | |
3122a88a | 34 | enum tpm_addr { |
daacdfa6 | 35 | TPM_SUPERIO_ADDR = 0x2E, |
3122a88a | 36 | TPM_ADDR = 0x4E, |
3122a88a KH |
37 | }; |
38 | ||
6659ca2a KH |
39 | extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr, |
40 | char *); | |
41 | extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr, | |
42 | char *); | |
43 | extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr, | |
44 | char *); | |
45 | extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr, | |
46 | const char *, size_t); | |
1da177e4 LT |
47 | |
48 | struct tpm_chip; | |
49 | ||
50 | struct tpm_vendor_specific { | |
e0dd03ca KJH |
51 | const u8 req_complete_mask; |
52 | const u8 req_complete_val; | |
53 | const u8 req_canceled; | |
ad5ea3cc KJH |
54 | void __iomem *iobase; /* ioremapped address */ |
55 | unsigned long base; /* TPM base address */ | |
56 | ||
57 | int region_size; | |
58 | int have_region; | |
1da177e4 LT |
59 | |
60 | int (*recv) (struct tpm_chip *, u8 *, size_t); | |
61 | int (*send) (struct tpm_chip *, u8 *, size_t); | |
62 | void (*cancel) (struct tpm_chip *); | |
b4ed3e3c | 63 | u8 (*status) (struct tpm_chip *); |
1da177e4 | 64 | struct miscdevice miscdev; |
6659ca2a | 65 | struct attribute_group *attr_group; |
1da177e4 LT |
66 | }; |
67 | ||
68 | struct tpm_chip { | |
e659a3fe | 69 | struct device *dev; /* Device stuff */ |
1da177e4 LT |
70 | |
71 | int dev_num; /* /dev/tpm# */ | |
72 | int num_opens; /* only one allowed */ | |
73 | int time_expired; | |
74 | ||
75 | /* Data passed to and from the tpm via the read/write calls */ | |
76 | u8 *data_buffer; | |
77 | atomic_t data_pending; | |
78 | struct semaphore buffer_mutex; | |
79 | ||
80 | struct timer_list user_read_timer; /* user needs to claim result */ | |
09e12f9f | 81 | struct work_struct work; |
1da177e4 | 82 | struct semaphore tpm_mutex; /* tpm is processing */ |
1da177e4 | 83 | |
90dda520 | 84 | struct tpm_vendor_specific vendor; |
1da177e4 | 85 | |
55a82ab3 KJH |
86 | struct dentry **bios_dir; |
87 | ||
1da177e4 LT |
88 | struct list_head list; |
89 | }; | |
90 | ||
daacdfa6 | 91 | static inline int tpm_read_index(int base, int index) |
1da177e4 | 92 | { |
daacdfa6 KJH |
93 | outb(index, base); |
94 | return inb(base+1) & 0xFF; | |
1da177e4 LT |
95 | } |
96 | ||
daacdfa6 | 97 | static inline void tpm_write_index(int base, int index, int value) |
1da177e4 | 98 | { |
daacdfa6 KJH |
99 | outb(index, base); |
100 | outb(value & 0xFF, base+1); | |
1da177e4 LT |
101 | } |
102 | ||
e0dd03ca KJH |
103 | extern struct tpm_chip* tpm_register_hardware(struct device *, |
104 | const struct tpm_vendor_specific *); | |
1da177e4 LT |
105 | extern int tpm_open(struct inode *, struct file *); |
106 | extern int tpm_release(struct inode *, struct file *); | |
107 | extern ssize_t tpm_write(struct file *, const char __user *, size_t, | |
108 | loff_t *); | |
109 | extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *); | |
e659a3fe | 110 | extern void tpm_remove_hardware(struct device *); |
ce2c87d4 KJH |
111 | extern int tpm_pm_suspend(struct device *, pm_message_t); |
112 | extern int tpm_pm_resume(struct device *); | |
55a82ab3 KJH |
113 | |
114 | #ifdef CONFIG_ACPI | |
115 | extern struct dentry ** tpm_bios_log_setup(char *); | |
116 | extern void tpm_bios_log_teardown(struct dentry **); | |
117 | #else | |
118 | static inline struct dentry* tpm_bios_log_setup(char *name) | |
119 | { | |
120 | return NULL; | |
121 | } | |
122 | static inline void tpm_bios_log_teardown(struct dentry **dir) | |
123 | { | |
124 | } | |
125 | #endif |