359 lines
8.6 KiB
C
359 lines
8.6 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/delay.h>
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#include <linux/fs.h>
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#include <linux/mutex.h>
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#include <linux/sched.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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#include <linux/tpm.h>
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enum tpm_const {
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TPM_MINOR = 224, /* officially assigned */
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TPM_BUFSIZE = 4096,
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TPM_NUM_DEVICES = 256,
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TPM_RETRY = 50, /* 5 seconds */
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};
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enum tpm_timeout {
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TPM_TIMEOUT = 5, /* msecs */
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TPM_TIMEOUT_RETRY = 100 /* 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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#define TPM_WARN_RETRY 0x800
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#define TPM_WARN_DOING_SELFTEST 0x802
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#define TPM_ERR_DEACTIVATED 0x6
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#define TPM_ERR_DISABLED 0x7
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#define TPM_ERR_INVALID_POSTINIT 38
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#define TPM_HEADER_SIZE 10
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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_show_caps_1_2(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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extern ssize_t tpm_show_enabled(struct device *, struct device_attribute *attr,
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char *);
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extern ssize_t tpm_show_active(struct device *, struct device_attribute *attr,
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char *);
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extern ssize_t tpm_show_owned(struct device *, struct device_attribute *attr,
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char *);
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extern ssize_t tpm_show_temp_deactivated(struct device *,
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struct device_attribute *attr, char *);
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extern ssize_t tpm_show_durations(struct device *,
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struct device_attribute *attr, char *);
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extern ssize_t tpm_show_timeouts(struct device *,
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struct device_attribute *attr, char *);
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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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bool (*req_canceled)(struct tpm_chip *chip, u8 status);
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void __iomem *iobase; /* ioremapped address */
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unsigned long base; /* TPM base address */
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int irq;
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int probed_irq;
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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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void (*release) (struct device *);
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struct miscdevice miscdev;
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struct attribute_group *attr_group;
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struct list_head list;
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int locality;
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unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
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bool timeout_adjusted;
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unsigned long duration[3]; /* jiffies */
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bool duration_adjusted;
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void *priv;
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wait_queue_head_t read_queue;
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wait_queue_head_t int_queue;
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u16 manufacturer_id;
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};
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#define TPM_VPRIV(c) (c)->vendor.priv
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#define TPM_VID_INTEL 0x8086
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#define TPM_VID_WINBOND 0x1050
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#define TPM_VID_STM 0x104A
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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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unsigned long is_open; /* 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 mutex 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 mutex 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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void (*release) (struct device *);
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};
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#define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)
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static inline void tpm_chip_put(struct tpm_chip *chip)
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{
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module_put(chip->dev->driver->owner);
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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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struct tpm_input_header {
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__be16 tag;
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__be32 length;
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__be32 ordinal;
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} __packed;
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struct tpm_output_header {
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__be16 tag;
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__be32 length;
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__be32 return_code;
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} __packed;
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struct stclear_flags_t {
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__be16 tag;
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u8 deactivated;
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u8 disableForceClear;
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u8 physicalPresence;
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u8 physicalPresenceLock;
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u8 bGlobalLock;
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} __packed;
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struct tpm_version_t {
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u8 Major;
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u8 Minor;
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u8 revMajor;
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u8 revMinor;
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} __packed;
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struct tpm_version_1_2_t {
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__be16 tag;
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u8 Major;
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u8 Minor;
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u8 revMajor;
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u8 revMinor;
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} __packed;
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struct timeout_t {
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__be32 a;
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__be32 b;
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__be32 c;
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__be32 d;
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} __packed;
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struct duration_t {
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__be32 tpm_short;
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__be32 tpm_medium;
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__be32 tpm_long;
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} __packed;
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struct permanent_flags_t {
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__be16 tag;
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u8 disable;
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u8 ownership;
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u8 deactivated;
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u8 readPubek;
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u8 disableOwnerClear;
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u8 allowMaintenance;
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u8 physicalPresenceLifetimeLock;
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u8 physicalPresenceHWEnable;
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u8 physicalPresenceCMDEnable;
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u8 CEKPUsed;
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u8 TPMpost;
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u8 TPMpostLock;
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u8 FIPS;
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u8 operator;
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u8 enableRevokeEK;
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u8 nvLocked;
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u8 readSRKPub;
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u8 tpmEstablished;
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u8 maintenanceDone;
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u8 disableFullDALogicInfo;
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} __packed;
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typedef union {
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struct permanent_flags_t perm_flags;
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struct stclear_flags_t stclear_flags;
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bool owned;
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__be32 num_pcrs;
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struct tpm_version_t tpm_version;
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struct tpm_version_1_2_t tpm_version_1_2;
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__be32 manufacturer_id;
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struct timeout_t timeout;
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struct duration_t duration;
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} cap_t;
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struct tpm_getcap_params_in {
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__be32 cap;
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__be32 subcap_size;
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__be32 subcap;
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} __packed;
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struct tpm_getcap_params_out {
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__be32 cap_size;
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cap_t cap;
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} __packed;
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struct tpm_readpubek_params_out {
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u8 algorithm[4];
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u8 encscheme[2];
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u8 sigscheme[2];
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__be32 paramsize;
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u8 parameters[12]; /*assuming RSA*/
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__be32 keysize;
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u8 modulus[256];
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u8 checksum[20];
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} __packed;
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typedef union {
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struct tpm_input_header in;
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struct tpm_output_header out;
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} tpm_cmd_header;
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#define TPM_DIGEST_SIZE 20
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struct tpm_pcrread_out {
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u8 pcr_result[TPM_DIGEST_SIZE];
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} __packed;
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struct tpm_pcrread_in {
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__be32 pcr_idx;
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} __packed;
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struct tpm_pcrextend_in {
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__be32 pcr_idx;
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u8 hash[TPM_DIGEST_SIZE];
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} __packed;
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/* 128 bytes is an arbitrary cap. This could be as large as TPM_BUFSIZE - 18
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* bytes, but 128 is still a relatively large number of random bytes and
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* anything much bigger causes users of struct tpm_cmd_t to start getting
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* compiler warnings about stack frame size. */
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#define TPM_MAX_RNG_DATA 128
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struct tpm_getrandom_out {
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__be32 rng_data_len;
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u8 rng_data[TPM_MAX_RNG_DATA];
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} __packed;
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struct tpm_getrandom_in {
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__be32 num_bytes;
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} __packed;
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struct tpm_startup_in {
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__be16 startup_type;
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} __packed;
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typedef union {
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struct tpm_getcap_params_out getcap_out;
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struct tpm_readpubek_params_out readpubek_out;
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u8 readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
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struct tpm_getcap_params_in getcap_in;
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struct tpm_pcrread_in pcrread_in;
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struct tpm_pcrread_out pcrread_out;
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struct tpm_pcrextend_in pcrextend_in;
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struct tpm_getrandom_in getrandom_in;
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struct tpm_getrandom_out getrandom_out;
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struct tpm_startup_in startup_in;
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} tpm_cmd_params;
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struct tpm_cmd_t {
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tpm_cmd_header header;
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tpm_cmd_params params;
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} __packed;
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ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *);
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extern int tpm_get_timeouts(struct tpm_chip *);
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extern void tpm_gen_interrupt(struct tpm_chip *);
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extern int tpm_do_selftest(struct tpm_chip *);
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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 void tpm_dev_vendor_release(struct tpm_chip *);
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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 *);
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extern int tpm_pm_resume(struct device *);
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extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long,
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wait_queue_head_t *, bool);
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#ifdef CONFIG_ACPI
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extern int tpm_add_ppi(struct kobject *);
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extern void tpm_remove_ppi(struct kobject *);
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#else
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static inline int tpm_add_ppi(struct kobject *parent)
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{
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return 0;
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}
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static inline void tpm_remove_ppi(struct kobject *parent)
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{
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}
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#endif
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