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/pci.h> 23 #include <linux/delay.h> 24 #include <linux/fs.h> 25 #include <linux/miscdevice.h> 26 #include <linux/platform_device.h> 27 #include <linux/io.h> 28 29 enum tpm_timeout { 30 TPM_TIMEOUT = 5, /* msecs */ 31 }; 32 33 /* TPM addresses */ 34 enum tpm_addr { 35 TPM_SUPERIO_ADDR = 0x2E, 36 TPM_ADDR = 0x4E, 37 }; 38 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_show_caps_1_2(struct device *, struct device_attribute *attr, 46 char *); 47 extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr, 48 const char *, size_t); 49 extern ssize_t tpm_show_enabled(struct device *, struct device_attribute *attr, 50 char *); 51 extern ssize_t tpm_show_active(struct device *, struct device_attribute *attr, 52 char *); 53 extern ssize_t tpm_show_owned(struct device *, struct device_attribute *attr, 54 char *); 55 extern ssize_t tpm_show_temp_deactivated(struct device *, 56 struct device_attribute *attr, char *); 57 58 struct tpm_chip; 59 60 struct tpm_vendor_specific { 61 const u8 req_complete_mask; 62 const u8 req_complete_val; 63 const u8 req_canceled; 64 void __iomem *iobase; /* ioremapped address */ 65 unsigned long base; /* TPM base address */ 66 67 int irq; 68 69 int region_size; 70 int have_region; 71 72 int (*recv) (struct tpm_chip *, u8 *, size_t); 73 int (*send) (struct tpm_chip *, u8 *, size_t); 74 void (*cancel) (struct tpm_chip *); 75 u8 (*status) (struct tpm_chip *); 76 struct miscdevice miscdev; 77 struct attribute_group *attr_group; 78 struct list_head list; 79 int locality; 80 unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */ 81 unsigned long duration[3]; /* jiffies */ 82 83 wait_queue_head_t read_queue; 84 wait_queue_head_t int_queue; 85 }; 86 87 struct tpm_chip { 88 struct device *dev; /* Device stuff */ 89 90 int dev_num; /* /dev/tpm# */ 91 int num_opens; /* only one allowed */ 92 int time_expired; 93 94 /* Data passed to and from the tpm via the read/write calls */ 95 u8 *data_buffer; 96 atomic_t data_pending; 97 struct semaphore buffer_mutex; 98 99 struct timer_list user_read_timer; /* user needs to claim result */ 100 struct work_struct work; 101 struct semaphore tpm_mutex; /* tpm is processing */ 102 103 struct tpm_vendor_specific vendor; 104 105 struct dentry **bios_dir; 106 107 struct list_head list; 108 }; 109 110 #define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor) 111 112 static inline int tpm_read_index(int base, int index) 113 { 114 outb(index, base); 115 return inb(base+1) & 0xFF; 116 } 117 118 static inline void tpm_write_index(int base, int index, int value) 119 { 120 outb(index, base); 121 outb(value & 0xFF, base+1); 122 } 123 124 extern void tpm_get_timeouts(struct tpm_chip *); 125 extern void tpm_gen_interrupt(struct tpm_chip *); 126 extern void tpm_continue_selftest(struct tpm_chip *); 127 extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32); 128 extern struct tpm_chip* tpm_register_hardware(struct device *, 129 const struct tpm_vendor_specific *); 130 extern int tpm_open(struct inode *, struct file *); 131 extern int tpm_release(struct inode *, struct file *); 132 extern ssize_t tpm_write(struct file *, const char __user *, size_t, 133 loff_t *); 134 extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *); 135 extern void tpm_remove_hardware(struct device *); 136 extern int tpm_pm_suspend(struct device *, pm_message_t); 137 extern int tpm_pm_resume(struct device *); 138 139 #ifdef CONFIG_ACPI 140 extern struct dentry ** tpm_bios_log_setup(char *); 141 extern void tpm_bios_log_teardown(struct dentry **); 142 #else 143 static inline struct dentry ** tpm_bios_log_setup(char *name) 144 { 145 return NULL; 146 } 147 static inline void tpm_bios_log_teardown(struct dentry **dir) 148 { 149 } 150 #endif 151