1 files changed, 697 insertions, 0 deletions

diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
new file mode 100644
index 000000000000..8318268169d6
--- /dev/null
+++ b/drivers/char/tpm/tpm.c
@@ -0,0 +1,697 @@
+/*
+ * 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.
+ * 
+ * Note, the TPM chip is not interrupt driven (only polling)
+ * and can have very long timeouts (minutes!). Hence the unusual
+ * calls to schedule_timeout.
+ *
+ */
+
+#include <linux/sched.h>
+#include <linux/poll.h>
+#include <linux/spinlock.h>
+#include "tpm.h"
+
+#define	TPM_MINOR			224	/* officially assigned */
+
+#define	TPM_BUFSIZE			2048
+
+/* PCI configuration addresses */
+#define	PCI_GEN_PMCON_1			0xA0
+#define	PCI_GEN1_DEC			0xE4
+#define	PCI_LPC_EN			0xE6
+#define	PCI_GEN2_DEC			0xEC
+
+static LIST_HEAD(tpm_chip_list);
+static DEFINE_SPINLOCK(driver_lock);
+static int dev_mask[32];
+
+static void user_reader_timeout(unsigned long ptr)
+{
+	struct tpm_chip *chip = (struct tpm_chip *) ptr;
+
+	down(&chip->buffer_mutex);
+	atomic_set(&chip->data_pending, 0);
+	memset(chip->data_buffer, 0, TPM_BUFSIZE);
+	up(&chip->buffer_mutex);
+}
+
+void tpm_time_expired(unsigned long ptr)
+{
+	int *exp = (int *) ptr;
+	*exp = 1;
+}
+
+EXPORT_SYMBOL_GPL(tpm_time_expired);
+
+/*
+ * Initialize the LPC bus and enable the TPM ports
+ */
+int tpm_lpc_bus_init(struct pci_dev *pci_dev, u16 base)
+{
+	u32 lpcenable, tmp;
+	int is_lpcm = 0;
+
+	switch (pci_dev->vendor) {
+	case PCI_VENDOR_ID_INTEL:
+		switch (pci_dev->device) {
+		case PCI_DEVICE_ID_INTEL_82801CA_12:
+		case PCI_DEVICE_ID_INTEL_82801DB_12:
+			is_lpcm = 1;
+			break;
+		}
+		/* init ICH (enable LPC) */
+		pci_read_config_dword(pci_dev, PCI_GEN1_DEC, &lpcenable);
+		lpcenable |= 0x20000000;
+		pci_write_config_dword(pci_dev, PCI_GEN1_DEC, lpcenable);
+
+		if (is_lpcm) {
+			pci_read_config_dword(pci_dev, PCI_GEN1_DEC,
+					      &lpcenable);
+			if ((lpcenable & 0x20000000) == 0) {
+				dev_err(&pci_dev->dev,
+					"cannot enable LPC\n");
+				return -ENODEV;
+			}
+		}
+
+		/* initialize TPM registers */
+		pci_read_config_dword(pci_dev, PCI_GEN2_DEC, &tmp);
+
+		if (!is_lpcm)
+			tmp = (tmp & 0xFFFF0000) | (base & 0xFFF0);
+		else
+			tmp =
+			    (tmp & 0xFFFF0000) | (base & 0xFFF0) |
+			    0x00000001;
+
+		pci_write_config_dword(pci_dev, PCI_GEN2_DEC, tmp);
+
+		if (is_lpcm) {
+			pci_read_config_dword(pci_dev, PCI_GEN_PMCON_1,
+					      &tmp);
+			tmp |= 0x00000004;	/* enable CLKRUN */
+			pci_write_config_dword(pci_dev, PCI_GEN_PMCON_1,
+					       tmp);
+		}
+		tpm_write_index(0x0D, 0x55);	/* unlock 4F */
+		tpm_write_index(0x0A, 0x00);	/* int disable */
+		tpm_write_index(0x08, base);	/* base addr lo */
+		tpm_write_index(0x09, (base & 0xFF00) >> 8);	/* base addr hi */
+		tpm_write_index(0x0D, 0xAA);	/* lock 4F */
+		break;
+	case PCI_VENDOR_ID_AMD:
+		/* nothing yet */
+		break;
+	}
+
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(tpm_lpc_bus_init);
+
+/*
+ * Internal kernel interface to transmit TPM commands
+ */
+static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
+			    size_t bufsiz)
+{
+	ssize_t len;
+	u32 count;
+	__be32 *native_size;
+
+	native_size = (__force __be32 *) (buf + 2);
+	count = be32_to_cpu(*native_size);
+
+	if (count == 0)
+		return -ENODATA;
+	if (count > bufsiz) {
+		dev_err(&chip->pci_dev->dev,
+			"invalid count value %x %x \n", count, bufsiz);
+		return -E2BIG;
+	}
+
+	down(&chip->tpm_mutex);
+
+	if ((len = chip->vendor->send(chip, (u8 *) buf, count)) < 0) {
+		dev_err(&chip->pci_dev->dev,
+			"tpm_transmit: tpm_send: error %d\n", len);
+		return len;
+	}
+
+	down(&chip->timer_manipulation_mutex);
+	chip->time_expired = 0;
+	init_timer(&chip->device_timer);
+	chip->device_timer.function = tpm_time_expired;
+	chip->device_timer.expires = jiffies + 2 * 60 * HZ;
+	chip->device_timer.data = (unsigned long) &chip->time_expired;
+	add_timer(&chip->device_timer);
+	up(&chip->timer_manipulation_mutex);
+
+	do {
+		u8 status = inb(chip->vendor->base + 1);
+		if ((status & chip->vendor->req_complete_mask) ==
+		    chip->vendor->req_complete_val) {
+			down(&chip->timer_manipulation_mutex);
+			del_singleshot_timer_sync(&chip->device_timer);
+			up(&chip->timer_manipulation_mutex);
+			goto out_recv;
+		}
+		set_current_state(TASK_UNINTERRUPTIBLE);
+		schedule_timeout(TPM_TIMEOUT);
+		rmb();
+	} while (!chip->time_expired);
+
+
+	chip->vendor->cancel(chip);
+	dev_err(&chip->pci_dev->dev, "Time expired\n");
+	up(&chip->tpm_mutex);
+	return -EIO;
+
+out_recv:
+	len = chip->vendor->recv(chip, (u8 *) buf, bufsiz);
+	if (len < 0)
+		dev_err(&chip->pci_dev->dev,
+			"tpm_transmit: tpm_recv: error %d\n", len);
+	up(&chip->tpm_mutex);
+	return len;
+}
+
+#define TPM_DIGEST_SIZE 20
+#define CAP_PCR_RESULT_SIZE 18
+static u8 cap_pcr[] = {
+	0, 193,			/* TPM_TAG_RQU_COMMAND */
+	0, 0, 0, 22,		/* length */
+	0, 0, 0, 101,		/* TPM_ORD_GetCapability */
+	0, 0, 0, 5,
+	0, 0, 0, 4,
+	0, 0, 1, 1
+};
+
+#define READ_PCR_RESULT_SIZE 30
+static u8 pcrread[] = {
+	0, 193,			/* TPM_TAG_RQU_COMMAND */
+	0, 0, 0, 14,		/* length */
+	0, 0, 0, 21,		/* TPM_ORD_PcrRead */
+	0, 0, 0, 0		/* PCR index */
+};
+
+static ssize_t show_pcrs(struct device *dev, char *buf)
+{
+	u8 data[READ_PCR_RESULT_SIZE];
+	ssize_t len;
+	int i, j, index, num_pcrs;
+	char *str = buf;
+
+	struct tpm_chip *chip =
+	    pci_get_drvdata(container_of(dev, struct pci_dev, dev));
+	if (chip == NULL)
+		return -ENODEV;
+
+	memcpy(data, cap_pcr, sizeof(cap_pcr));
+	if ((len = tpm_transmit(chip, data, sizeof(data)))
+	    < CAP_PCR_RESULT_SIZE)
+		return len;
+
+	num_pcrs = be32_to_cpu(*((__force __be32 *) (data + 14)));
+
+	for (i = 0; i < num_pcrs; i++) {
+		memcpy(data, pcrread, sizeof(pcrread));
+		index = cpu_to_be32(i);
+		memcpy(data + 10, &index, 4);
+		if ((len = tpm_transmit(chip, data, sizeof(data)))
+		    < READ_PCR_RESULT_SIZE)
+			return len;
+		str += sprintf(str, "PCR-%02d: ", i);
+		for (j = 0; j < TPM_DIGEST_SIZE; j++)
+			str += sprintf(str, "%02X ", *(data + 10 + j));
+		str += sprintf(str, "\n");
+	}
+	return str - buf;
+}
+
+static DEVICE_ATTR(pcrs, S_IRUGO, show_pcrs, NULL);
+
+#define  READ_PUBEK_RESULT_SIZE 314
+static u8 readpubek[] = {
+	0, 193,			/* TPM_TAG_RQU_COMMAND */
+	0, 0, 0, 30,		/* length */
+	0, 0, 0, 124,		/* TPM_ORD_ReadPubek */
+};
+
+static ssize_t show_pubek(struct device *dev, char *buf)
+{
+	u8 data[READ_PUBEK_RESULT_SIZE];
+	ssize_t len;
+	__be32 *native_val;
+	int i;
+	char *str = buf;
+
+	struct tpm_chip *chip =
+	    pci_get_drvdata(container_of(dev, struct pci_dev, dev));
+	if (chip == NULL)
+		return -ENODEV;
+
+	memcpy(data, readpubek, sizeof(readpubek));
+	memset(data + sizeof(readpubek), 0, 20);	/* zero nonce */
+
+	if ((len = tpm_transmit(chip, data, sizeof(data))) <
+	    READ_PUBEK_RESULT_SIZE)
+		return len;
+
+	/* 
+	   ignore header 10 bytes
+	   algorithm 32 bits (1 == RSA )
+	   encscheme 16 bits
+	   sigscheme 16 bits
+	   parameters (RSA 12->bytes: keybit, #primes, expbit)  
+	   keylenbytes 32 bits
+	   256 byte modulus
+	   ignore checksum 20 bytes
+	 */
+
+	native_val = (__force __be32 *) (data + 34);
+
+	str +=
+	    sprintf(str,
+		    "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
+		    "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X"
+		    " %02X %02X %02X %02X %02X %02X %02X %02X\n"
+		    "Modulus length: %d\nModulus: \n",
+		    data[10], data[11], data[12], data[13], data[14],
+		    data[15], data[16], data[17], data[22], data[23],
+		    data[24], data[25], data[26], data[27], data[28],
+		    data[29], data[30], data[31], data[32], data[33],
+		    be32_to_cpu(*native_val)
+	    );
+
+	for (i = 0; i < 256; i++) {
+		str += sprintf(str, "%02X ", data[i + 39]);
+		if ((i + 1) % 16 == 0)
+			str += sprintf(str, "\n");
+	}
+	return str - buf;
+}
+
+static DEVICE_ATTR(pubek, S_IRUGO, show_pubek, NULL);
+
+#define CAP_VER_RESULT_SIZE 18
+static u8 cap_version[] = {
+	0, 193,			/* TPM_TAG_RQU_COMMAND */
+	0, 0, 0, 18,		/* length */
+	0, 0, 0, 101,		/* TPM_ORD_GetCapability */
+	0, 0, 0, 6,
+	0, 0, 0, 0
+};
+
+#define CAP_MANUFACTURER_RESULT_SIZE 18
+static u8 cap_manufacturer[] = {
+	0, 193,			/* TPM_TAG_RQU_COMMAND */
+	0, 0, 0, 22,		/* length */
+	0, 0, 0, 101,		/* TPM_ORD_GetCapability */
+	0, 0, 0, 5,
+	0, 0, 0, 4,
+	0, 0, 1, 3
+};
+
+static ssize_t show_caps(struct device *dev, char *buf)
+{
+	u8 data[READ_PUBEK_RESULT_SIZE];
+	ssize_t len;
+	char *str = buf;
+
+	struct tpm_chip *chip =
+	    pci_get_drvdata(container_of(dev, struct pci_dev, dev));
+	if (chip == NULL)
+		return -ENODEV;
+
+	memcpy(data, cap_manufacturer, sizeof(cap_manufacturer));
+
+	if ((len = tpm_transmit(chip, data, sizeof(data))) <
+	    CAP_MANUFACTURER_RESULT_SIZE)
+		return len;
+
+	str += sprintf(str, "Manufacturer: 0x%x\n",
+		       be32_to_cpu(*(data + 14)));
+
+	memcpy(data, cap_version, sizeof(cap_version));
+
+	if ((len = tpm_transmit(chip, data, sizeof(data))) <
+	    CAP_VER_RESULT_SIZE)
+		return len;
+
+	str +=
+	    sprintf(str, "TCG version: %d.%d\nFirmware version: %d.%d\n",
+		    (int) data[14], (int) data[15], (int) data[16],
+		    (int) data[17]);
+
+	return str - buf;
+}
+
+static DEVICE_ATTR(caps, S_IRUGO, show_caps, NULL);
+
+/*
+ * Device file system interface to the TPM
+ */
+int tpm_open(struct inode *inode, struct file *file)
+{
+	int rc = 0, minor = iminor(inode);
+	struct tpm_chip *chip = NULL, *pos;
+
+	spin_lock(&driver_lock);
+
+	list_for_each_entry(pos, &tpm_chip_list, list) {
+		if (pos->vendor->miscdev.minor == minor) {
+			chip = pos;
+			break;
+		}
+	}
+
+	if (chip == NULL) {
+		rc = -ENODEV;
+		goto err_out;
+	}
+
+	if (chip->num_opens) {
+		dev_dbg(&chip->pci_dev->dev,
+			"Another process owns this TPM\n");
+		rc = -EBUSY;
+		goto err_out;
+	}
+
+	chip->num_opens++;
+	pci_dev_get(chip->pci_dev);
+
+	spin_unlock(&driver_lock);
+
+	chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
+	if (chip->data_buffer == NULL) {
+		chip->num_opens--;
+		pci_dev_put(chip->pci_dev);
+		return -ENOMEM;
+	}
+
+	atomic_set(&chip->data_pending, 0);
+
+	file->private_data = chip;
+	return 0;
+
+err_out:
+	spin_unlock(&driver_lock);
+	return rc;
+}
+
+EXPORT_SYMBOL_GPL(tpm_open);
+
+int tpm_release(struct inode *inode, struct file *file)
+{
+	struct tpm_chip *chip = file->private_data;
+	
+	file->private_data = NULL;
+
+	spin_lock(&driver_lock);
+	chip->num_opens--;
+	spin_unlock(&driver_lock);
+
+	down(&chip->timer_manipulation_mutex);
+	if (timer_pending(&chip->user_read_timer))
+		del_singleshot_timer_sync(&chip->user_read_timer);
+	else if (timer_pending(&chip->device_timer))
+		del_singleshot_timer_sync(&chip->device_timer);
+	up(&chip->timer_manipulation_mutex);
+
+	kfree(chip->data_buffer);
+	atomic_set(&chip->data_pending, 0);
+
+	pci_dev_put(chip->pci_dev);
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(tpm_release);
+
+ssize_t tpm_write(struct file * file, const char __user * buf,
+		  size_t size, loff_t * off)
+{
+	struct tpm_chip *chip = file->private_data;
+	int in_size = size, out_size;
+
+	/* cannot perform a write until the read has cleared
+	   either via tpm_read or a user_read_timer timeout */
+	while (atomic_read(&chip->data_pending) != 0) {
+		set_current_state(TASK_UNINTERRUPTIBLE);
+		schedule_timeout(TPM_TIMEOUT);
+	}
+
+	down(&chip->buffer_mutex);
+
+	if (in_size > TPM_BUFSIZE)
+		in_size = TPM_BUFSIZE;
+
+	if (copy_from_user
+	    (chip->data_buffer, (void __user *) buf, in_size)) {
+		up(&chip->buffer_mutex);
+		return -EFAULT;
+	}
+
+	/* atomic tpm command send and result receive */
+	out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
+
+	atomic_set(&chip->data_pending, out_size);
+	up(&chip->buffer_mutex);
+
+	/* Set a timeout by which the reader must come claim the result */
+	down(&chip->timer_manipulation_mutex);
+	init_timer(&chip->user_read_timer);
+	chip->user_read_timer.function = user_reader_timeout;
+	chip->user_read_timer.data = (unsigned long) chip;
+	chip->user_read_timer.expires = jiffies + (60 * HZ);
+	add_timer(&chip->user_read_timer);
+	up(&chip->timer_manipulation_mutex);
+
+	return in_size;
+}
+
+EXPORT_SYMBOL_GPL(tpm_write);
+
+ssize_t tpm_read(struct file * file, char __user * buf,
+		 size_t size, loff_t * off)
+{
+	struct tpm_chip *chip = file->private_data;
+	int ret_size = -ENODATA;
+
+	if (atomic_read(&chip->data_pending) != 0) {	/* Result available */
+		down(&chip->timer_manipulation_mutex);
+		del_singleshot_timer_sync(&chip->user_read_timer);
+		up(&chip->timer_manipulation_mutex);
+
+		down(&chip->buffer_mutex);
+
+		ret_size = atomic_read(&chip->data_pending);
+		atomic_set(&chip->data_pending, 0);
+
+		if (ret_size == 0)	/* timeout just occurred */
+			ret_size = -ETIME;
+		else if (ret_size > 0) {	/* relay data */
+			if (size < ret_size)
+				ret_size = size;
+
+			if (copy_to_user((void __user *) buf,
+					 chip->data_buffer, ret_size)) {
+				ret_size = -EFAULT;
+			}
+		}
+		up(&chip->buffer_mutex);
+	}
+
+	return ret_size;
+}
+
+EXPORT_SYMBOL_GPL(tpm_read);
+
+void __devexit tpm_remove(struct pci_dev *pci_dev)
+{
+	struct tpm_chip *chip = pci_get_drvdata(pci_dev);
+
+	if (chip == NULL) {
+		dev_err(&pci_dev->dev, "No device data found\n");
+		return;
+	}
+
+	spin_lock(&driver_lock);
+
+	list_del(&chip->list);
+
+	spin_unlock(&driver_lock);
+
+	pci_set_drvdata(pci_dev, NULL);
+	misc_deregister(&chip->vendor->miscdev);
+
+	device_remove_file(&pci_dev->dev, &dev_attr_pubek);
+	device_remove_file(&pci_dev->dev, &dev_attr_pcrs);
+	device_remove_file(&pci_dev->dev, &dev_attr_caps);
+
+	pci_disable_device(pci_dev);
+
+	dev_mask[chip->dev_num / 32] &= !(1 << (chip->dev_num % 32));
+
+	kfree(chip);
+
+	pci_dev_put(pci_dev);
+}
+
+EXPORT_SYMBOL_GPL(tpm_remove);
+
+static u8 savestate[] = {
+	0, 193,			/* TPM_TAG_RQU_COMMAND */
+	0, 0, 0, 10,		/* blob length (in bytes) */
+	0, 0, 0, 152		/* TPM_ORD_SaveState */
+};
+
+/*
+ * We are about to suspend. Save the TPM state
+ * so that it can be restored.
+ */
+int tpm_pm_suspend(struct pci_dev *pci_dev, u32 pm_state)
+{
+	struct tpm_chip *chip = pci_get_drvdata(pci_dev);
+	if (chip == NULL)
+		return -ENODEV;
+
+	tpm_transmit(chip, savestate, sizeof(savestate));
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(tpm_pm_suspend);
+
+/*
+ * Resume from a power safe. The BIOS already restored
+ * the TPM state.
+ */
+int tpm_pm_resume(struct pci_dev *pci_dev)
+{
+	struct tpm_chip *chip = pci_get_drvdata(pci_dev);
+
+	if (chip == NULL)
+		return -ENODEV;
+
+	spin_lock(&driver_lock);
+	tpm_lpc_bus_init(pci_dev, chip->vendor->base);
+	spin_unlock(&driver_lock);
+
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(tpm_pm_resume);
+
+/*
+ * Called from tpm_<specific>.c probe function only for devices 
+ * the driver has determined it should claim.  Prior to calling
+ * this function the specific probe function has called pci_enable_device
+ * upon errant exit from this function specific probe function should call
+ * pci_disable_device
+ */
+int tpm_register_hardware(struct pci_dev *pci_dev,
+			  struct tpm_vendor_specific *entry)
+{
+	char devname[7];
+	struct tpm_chip *chip;
+	int i, j;
+
+	/* Driver specific per-device data */
+	chip = kmalloc(sizeof(*chip), GFP_KERNEL);
+	if (chip == NULL)
+		return -ENOMEM;
+
+	memset(chip, 0, sizeof(struct tpm_chip));
+
+	init_MUTEX(&chip->buffer_mutex);
+	init_MUTEX(&chip->tpm_mutex);
+	init_MUTEX(&chip->timer_manipulation_mutex);
+	INIT_LIST_HEAD(&chip->list);
+
+	chip->vendor = entry;
+
+	chip->dev_num = -1;
+
+	for (i = 0; i < 32; i++)
+		for (j = 0; j < 8; j++)
+			if ((dev_mask[i] & (1 << j)) == 0) {
+				chip->dev_num = i * 32 + j;
+				dev_mask[i] |= 1 << j;
+				goto dev_num_search_complete;
+			}
+
+dev_num_search_complete:
+	if (chip->dev_num < 0) {
+		dev_err(&pci_dev->dev,
+			"No available tpm device numbers\n");
+		kfree(chip);
+		return -ENODEV;
+	} else if (chip->dev_num == 0)
+		chip->vendor->miscdev.minor = TPM_MINOR;
+	else
+		chip->vendor->miscdev.minor = MISC_DYNAMIC_MINOR;
+
+	snprintf(devname, sizeof(devname), "%s%d", "tpm", chip->dev_num);
+	chip->vendor->miscdev.name = devname;
+
+	chip->vendor->miscdev.dev = &(pci_dev->dev);
+	chip->pci_dev = pci_dev_get(pci_dev);
+
+	if (misc_register(&chip->vendor->miscdev)) {
+		dev_err(&chip->pci_dev->dev,
+			"unable to misc_register %s, minor %d\n",
+			chip->vendor->miscdev.name,
+			chip->vendor->miscdev.minor);
+		pci_dev_put(pci_dev);
+		kfree(chip);
+		dev_mask[i] &= !(1 << j);
+		return -ENODEV;
+	}
+
+	pci_set_drvdata(pci_dev, chip);
+
+	list_add(&chip->list, &tpm_chip_list);
+
+	device_create_file(&pci_dev->dev, &dev_attr_pubek);
+	device_create_file(&pci_dev->dev, &dev_attr_pcrs);
+	device_create_file(&pci_dev->dev, &dev_attr_caps);
+
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(tpm_register_hardware);
+
+static int __init init_tpm(void)
+{
+	return 0;
+}
+
+static void __exit cleanup_tpm(void)
+{
+
+}
+
+module_init(init_tpm);
+module_exit(cleanup_tpm);
+
+MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
+MODULE_DESCRIPTION("TPM Driver");
+MODULE_VERSION("2.0");
+MODULE_LICENSE("GPL");