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 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; 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) 114 115 static inline int tpm_read_index(int base, int index) 116 { 117 outb(index, base); 118 return inb(base+1) & 0xFF; 119 } 120 121 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 ssize_t tpm_write(struct file *, const char __user *, size_t, 136 loff_t *); 137 extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *); 138 extern void tpm_remove_hardware(struct device *); 139 extern int tpm_pm_suspend(struct device *, pm_message_t); 140 extern int tpm_pm_resume(struct device *); 141 142 #ifdef CONFIG_ACPI 143 extern struct dentry ** tpm_bios_log_setup(char *); 144 extern void tpm_bios_log_teardown(struct dentry **); 145 #else 146 static inline struct dentry ** tpm_bios_log_setup(char *name) 147 { 148 return NULL; 149 } 150 static inline void tpm_bios_log_teardown(struct dentry **dir) 151 { 152 } 153 #endif 154