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/version.h> 23 #include <linux/pci.h> 24 #include <linux/delay.h> 25 #include <linux/fs.h> 26 #include <linux/miscdevice.h> 27 28 #define TPM_TIMEOUT msecs_to_jiffies(5) 29 30 /* TPM addresses */ 31 #define TPM_ADDR 0x4E 32 #define TPM_DATA 0x4F 33 34 struct tpm_chip; 35 36 struct tpm_vendor_specific { 37 u8 req_complete_mask; 38 u8 req_complete_val; 39 u16 base; /* TPM base address */ 40 41 int (*recv) (struct tpm_chip *, u8 *, size_t); 42 int (*send) (struct tpm_chip *, u8 *, size_t); 43 void (*cancel) (struct tpm_chip *); 44 struct miscdevice miscdev; 45 }; 46 47 struct tpm_chip { 48 struct pci_dev *pci_dev; /* PCI device stuff */ 49 50 int dev_num; /* /dev/tpm# */ 51 int num_opens; /* only one allowed */ 52 int time_expired; 53 54 /* Data passed to and from the tpm via the read/write calls */ 55 u8 *data_buffer; 56 atomic_t data_pending; 57 struct semaphore buffer_mutex; 58 59 struct timer_list user_read_timer; /* user needs to claim result */ 60 struct semaphore tpm_mutex; /* tpm is processing */ 61 struct timer_list device_timer; /* tpm is processing */ 62 struct semaphore timer_manipulation_mutex; 63 64 struct tpm_vendor_specific *vendor; 65 66 struct list_head list; 67 }; 68 69 static inline int tpm_read_index(int index) 70 { 71 outb(index, TPM_ADDR); 72 return inb(TPM_DATA) & 0xFF; 73 } 74 75 static inline void tpm_write_index(int index, int value) 76 { 77 outb(index, TPM_ADDR); 78 outb(value & 0xFF, TPM_DATA); 79 } 80 81 extern void tpm_time_expired(unsigned long); 82 extern int tpm_lpc_bus_init(struct pci_dev *, u16); 83 84 extern int tpm_register_hardware(struct pci_dev *, 85 struct tpm_vendor_specific *); 86 extern int tpm_open(struct inode *, struct file *); 87 extern int tpm_release(struct inode *, struct file *); 88 extern ssize_t tpm_write(struct file *, const char __user *, size_t, 89 loff_t *); 90 extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *); 91 extern void __devexit tpm_remove(struct pci_dev *); 92 extern int tpm_pm_suspend(struct pci_dev *, u32); 93 extern int tpm_pm_resume(struct pci_dev *); 94