9e18ee1917
With the TPM 1.2 Specification, each command is classified as short, medium or long and the chip tells you the maximum amount of time for a response to each class of command. This patch provides and array of the classifications and a function to determine how long the response should be waited for. Also, it uses that information in the command processing to determine how long to poll for. The function is exported so the 1.2 driver can use the functionality to determine how long to wait for a DataAvailable interrupt if interrupts are being used. Signed-off-by: Kylene Hall <kjhall@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
127 lines
3.4 KiB
C
127 lines
3.4 KiB
C
/*
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* Copyright (C) 2004 IBM Corporation
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*
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* Authors:
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* Leendert van Doorn <leendert@watson.ibm.com>
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* Dave Safford <safford@watson.ibm.com>
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* Reiner Sailer <sailer@watson.ibm.com>
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* Kylene Hall <kjhall@us.ibm.com>
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*
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* Maintained by: <tpmdd_devel@lists.sourceforge.net>
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*
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* Device driver for TCG/TCPA TPM (trusted platform module).
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* Specifications at www.trustedcomputinggroup.org
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*
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*/
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/delay.h>
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#include <linux/fs.h>
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#include <linux/miscdevice.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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enum tpm_timeout {
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TPM_TIMEOUT = 5, /* msecs */
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};
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/* TPM addresses */
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enum tpm_addr {
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TPM_SUPERIO_ADDR = 0x2E,
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TPM_ADDR = 0x4E,
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};
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extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr,
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char *);
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extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr,
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char *);
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extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr,
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char *);
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extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr,
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const char *, size_t);
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struct tpm_chip;
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struct tpm_vendor_specific {
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const u8 req_complete_mask;
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const u8 req_complete_val;
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const u8 req_canceled;
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void __iomem *iobase; /* ioremapped address */
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unsigned long base; /* TPM base address */
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int region_size;
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int have_region;
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int (*recv) (struct tpm_chip *, u8 *, size_t);
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int (*send) (struct tpm_chip *, u8 *, size_t);
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void (*cancel) (struct tpm_chip *);
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u8 (*status) (struct tpm_chip *);
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struct miscdevice miscdev;
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struct attribute_group *attr_group;
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u32 duration[3];
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};
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struct tpm_chip {
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struct device *dev; /* Device stuff */
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int dev_num; /* /dev/tpm# */
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int num_opens; /* only one allowed */
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int time_expired;
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/* Data passed to and from the tpm via the read/write calls */
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u8 *data_buffer;
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atomic_t data_pending;
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struct semaphore buffer_mutex;
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struct timer_list user_read_timer; /* user needs to claim result */
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struct work_struct work;
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struct semaphore tpm_mutex; /* tpm is processing */
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struct tpm_vendor_specific vendor;
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struct dentry **bios_dir;
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struct list_head list;
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};
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static inline int tpm_read_index(int base, int index)
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{
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outb(index, base);
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return inb(base+1) & 0xFF;
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}
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static inline void tpm_write_index(int base, int index, int value)
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{
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outb(index, base);
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outb(value & 0xFF, base+1);
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}
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extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
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extern struct tpm_chip* tpm_register_hardware(struct device *,
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const struct tpm_vendor_specific *);
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extern int tpm_open(struct inode *, struct file *);
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extern int tpm_release(struct inode *, struct file *);
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extern ssize_t tpm_write(struct file *, const char __user *, size_t,
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loff_t *);
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extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
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extern void tpm_remove_hardware(struct device *);
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extern int tpm_pm_suspend(struct device *, pm_message_t);
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extern int tpm_pm_resume(struct device *);
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#ifdef CONFIG_ACPI
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extern struct dentry ** tpm_bios_log_setup(char *);
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extern void tpm_bios_log_teardown(struct dentry **);
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#else
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static inline struct dentry* tpm_bios_log_setup(char *name)
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{
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return NULL;
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}
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static inline void tpm_bios_log_teardown(struct dentry **dir)
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{
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}
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#endif
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