Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/pci.h> |
| 23 | #include <linux/delay.h> |
| 24 | #include <linux/fs.h> |
| 25 | #include <linux/miscdevice.h> |
Al Viro | bbc5b21 | 2005-11-01 15:14:05 +0000 | [diff] [blame] | 26 | #include <linux/platform_device.h> |
Andrew Morton | 276ad0c | 2006-03-25 03:07:35 -0800 | [diff] [blame] | 27 | #include <linux/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
Kylene Hall | 3122a88 | 2005-06-23 22:01:48 -0700 | [diff] [blame] | 29 | enum tpm_timeout { |
| 30 | TPM_TIMEOUT = 5, /* msecs */ |
| 31 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | /* TPM addresses */ |
Kylene Hall | 3122a88 | 2005-06-23 22:01:48 -0700 | [diff] [blame] | 34 | enum tpm_addr { |
Kylene Jo Hall | daacdfa | 2005-06-25 14:55:39 -0700 | [diff] [blame] | 35 | TPM_SUPERIO_ADDR = 0x2E, |
Kylene Hall | 3122a88 | 2005-06-23 22:01:48 -0700 | [diff] [blame] | 36 | TPM_ADDR = 0x4E, |
Kylene Hall | 3122a88 | 2005-06-23 22:01:48 -0700 | [diff] [blame] | 37 | }; |
| 38 | |
Kylene Hall | 6659ca2 | 2005-06-23 22:02:00 -0700 | [diff] [blame] | 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); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
| 48 | struct tpm_chip; |
| 49 | |
| 50 | struct tpm_vendor_specific { |
Kylene Jo Hall | e0dd03c | 2006-04-22 02:37:26 -0700 | [diff] [blame] | 51 | const u8 req_complete_mask; |
| 52 | const u8 req_complete_val; |
| 53 | const u8 req_canceled; |
Kylene Jo Hall | ad5ea3c | 2005-11-13 16:07:41 -0800 | [diff] [blame] | 54 | void __iomem *iobase; /* ioremapped address */ |
| 55 | unsigned long base; /* TPM base address */ |
| 56 | |
| 57 | int region_size; |
| 58 | int have_region; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 *); |
Kylene Jo Hall | b4ed3e3 | 2005-10-30 15:03:23 -0800 | [diff] [blame] | 63 | u8 (*status) (struct tpm_chip *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | struct miscdevice miscdev; |
Kylene Hall | 6659ca2 | 2005-06-23 22:02:00 -0700 | [diff] [blame] | 65 | struct attribute_group *attr_group; |
Kylene Jo Hall | 9e18ee1 | 2006-04-22 02:37:38 -0700 | [diff] [blame^] | 66 | u32 duration[3]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | }; |
| 68 | |
| 69 | struct tpm_chip { |
Kylene Jo Hall | e659a3f | 2005-10-30 15:03:24 -0800 | [diff] [blame] | 70 | struct device *dev; /* Device stuff */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
| 72 | int dev_num; /* /dev/tpm# */ |
| 73 | int num_opens; /* only one allowed */ |
| 74 | int time_expired; |
| 75 | |
| 76 | /* Data passed to and from the tpm via the read/write calls */ |
| 77 | u8 *data_buffer; |
| 78 | atomic_t data_pending; |
| 79 | struct semaphore buffer_mutex; |
| 80 | |
| 81 | struct timer_list user_read_timer; /* user needs to claim result */ |
Kylene Jo Hall | 09e12f9 | 2005-11-13 16:07:43 -0800 | [diff] [blame] | 82 | struct work_struct work; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | struct semaphore tpm_mutex; /* tpm is processing */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
Kylene Jo Hall | 90dda52 | 2006-04-22 02:37:15 -0700 | [diff] [blame] | 85 | struct tpm_vendor_specific vendor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | |
Kylene Jo Hall | 55a82ab | 2006-01-08 01:03:15 -0800 | [diff] [blame] | 87 | struct dentry **bios_dir; |
| 88 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | struct list_head list; |
| 90 | }; |
| 91 | |
Kylene Jo Hall | daacdfa | 2005-06-25 14:55:39 -0700 | [diff] [blame] | 92 | static inline int tpm_read_index(int base, int index) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | { |
Kylene Jo Hall | daacdfa | 2005-06-25 14:55:39 -0700 | [diff] [blame] | 94 | outb(index, base); |
| 95 | return inb(base+1) & 0xFF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | } |
| 97 | |
Kylene Jo Hall | daacdfa | 2005-06-25 14:55:39 -0700 | [diff] [blame] | 98 | static inline void tpm_write_index(int base, int index, int value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | { |
Kylene Jo Hall | daacdfa | 2005-06-25 14:55:39 -0700 | [diff] [blame] | 100 | outb(index, base); |
| 101 | outb(value & 0xFF, base+1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | } |
| 103 | |
Kylene Jo Hall | 9e18ee1 | 2006-04-22 02:37:38 -0700 | [diff] [blame^] | 104 | extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32); |
Kylene Jo Hall | e0dd03c | 2006-04-22 02:37:26 -0700 | [diff] [blame] | 105 | extern struct tpm_chip* tpm_register_hardware(struct device *, |
| 106 | const struct tpm_vendor_specific *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | extern int tpm_open(struct inode *, struct file *); |
| 108 | extern int tpm_release(struct inode *, struct file *); |
| 109 | extern ssize_t tpm_write(struct file *, const char __user *, size_t, |
| 110 | loff_t *); |
| 111 | extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *); |
Kylene Jo Hall | e659a3f | 2005-10-30 15:03:24 -0800 | [diff] [blame] | 112 | extern void tpm_remove_hardware(struct device *); |
Kylene Jo Hall | ce2c87d | 2005-10-30 15:03:25 -0800 | [diff] [blame] | 113 | extern int tpm_pm_suspend(struct device *, pm_message_t); |
| 114 | extern int tpm_pm_resume(struct device *); |
Kylene Jo Hall | 55a82ab | 2006-01-08 01:03:15 -0800 | [diff] [blame] | 115 | |
| 116 | #ifdef CONFIG_ACPI |
| 117 | extern struct dentry ** tpm_bios_log_setup(char *); |
| 118 | extern void tpm_bios_log_teardown(struct dentry **); |
| 119 | #else |
| 120 | static inline struct dentry* tpm_bios_log_setup(char *name) |
| 121 | { |
| 122 | return NULL; |
| 123 | } |
| 124 | static inline void tpm_bios_log_teardown(struct dentry **dir) |
| 125 | { |
| 126 | } |
| 127 | #endif |