/* * Copyright (C) 2004 IBM Corporation * * Authors: * Leendert van Doorn <leendert@watson.ibm.com> * Dave Safford <safford@watson.ibm.com> * Reiner Sailer <sailer@watson.ibm.com> * Kylene Hall <kjhall@us.ibm.com> * * Maintained by: <tpmdd_devel@lists.sourceforge.net> * * Device driver for TCG/TCPA TPM (trusted platform module). * Specifications at www.trustedcomputinggroup.org * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation, version 2 of the * License. * */ #include <linux/module.h> #include <linux/pci.h> #include <linux/delay.h> #include <linux/fs.h> #include <linux/miscdevice.h> #include <linux/platform_device.h> #include <linux/io.h> enum tpm_timeout { TPM_TIMEOUT = 5, /* msecs */ }; /* TPM addresses */ enum tpm_addr { TPM_SUPERIO_ADDR = 0x2E, TPM_ADDR = 0x4E, }; extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr, char *); extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr, char *); extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr, char *); extern ssize_t tpm_show_caps_1_2(struct device *, struct device_attribute *attr, char *); extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr, const char *, size_t); extern ssize_t tpm_show_enabled(struct device *, struct device_attribute *attr, char *); extern ssize_t tpm_show_active(struct device *, struct device_attribute *attr, char *); extern ssize_t tpm_show_owned(struct device *, struct device_attribute *attr, char *); extern ssize_t tpm_show_temp_deactivated(struct device *, struct device_attribute *attr, char *); struct tpm_chip; struct tpm_vendor_specific { const u8 req_complete_mask; const u8 req_complete_val; const u8 req_canceled; void __iomem *iobase; /* ioremapped address */ unsigned long base; /* TPM base address */ int irq; int region_size; int have_region; int (*recv) (struct tpm_chip *, u8 *, size_t); int (*send) (struct tpm_chip *, u8 *, size_t); void (*cancel) (struct tpm_chip *); u8 (*status) (struct tpm_chip *); struct miscdevice miscdev; struct attribute_group *attr_group; struct list_head list; int locality; unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */ unsigned long duration[3]; /* jiffies */ wait_queue_head_t read_queue; wait_queue_head_t int_queue; }; struct tpm_chip { struct device *dev; /* Device stuff */ int dev_num; /* /dev/tpm# */ int num_opens; /* only one allowed */ int time_expired; /* Data passed to and from the tpm via the read/write calls */ u8 *data_buffer; atomic_t data_pending; struct semaphore buffer_mutex; struct timer_list user_read_timer; /* user needs to claim result */ struct work_struct work; struct semaphore tpm_mutex; /* tpm is processing */ struct tpm_vendor_specific vendor; struct dentry **bios_dir; struct list_head list; }; #define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor) static inline int tpm_read_index(int base, int index) { outb(index, base); return inb(base+1) & 0xFF; } static inline void tpm_write_index(int base, int index, int value) { outb(index, base); outb(value & 0xFF, base+1); } extern void tpm_get_timeouts(struct tpm_chip *); extern void tpm_gen_interrupt(struct tpm_chip *); extern void tpm_continue_selftest(struct tpm_chip *); extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32); extern struct tpm_chip* tpm_register_hardware(struct device *, const struct tpm_vendor_specific *); extern int tpm_open(struct inode *, struct file *); extern int tpm_release(struct inode *, struct file *); extern ssize_t tpm_write(struct file *, const char __user *, size_t, loff_t *); extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *); extern void tpm_remove_hardware(struct device *); extern int tpm_pm_suspend(struct device *, pm_message_t); extern int tpm_pm_resume(struct device *); #ifdef CONFIG_ACPI extern struct dentry ** tpm_bios_log_setup(char *); extern void tpm_bios_log_teardown(struct dentry **); #else static inline struct dentry ** tpm_bios_log_setup(char *name) { return NULL; } static inline void tpm_bios_log_teardown(struct dentry **dir) { } #endif