[PATCH] tpm: Support for Infineon TPM (ebb81fdb) · Commits · 戴 / test

drivers/char/tpm/Kconfig

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Original line number	Diff line number	Diff line
		@@ -35,5 +35,16 @@ config TCG_ATMEL
		will be accessible from within Linux. To compile this driver
		as a module, choose M here; the module will be called tpm_atmel.

		config TCG_INFINEON
		tristate "Infineon Technologies SLD 9630 TPM Interface"
		depends on TCG_TPM
		---help---
		If you have a TPM security chip from Infineon Technologies
		say Yes and it will be accessible from within Linux. To
		compile this driver as a module, choose M here; the module
		will be called tpm_infineon.
		Further information on this driver and the supported hardware
		can be found at http://www.prosec.rub.de/tpm

		endmenu

drivers/char/tpm/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -4,4 +4,4 @@
		obj-$(CONFIG_TCG_TPM) += tpm.o
		obj-$(CONFIG_TCG_NSC) += tpm_nsc.o
		obj-$(CONFIG_TCG_ATMEL) += tpm_atmel.o

		obj-$(CONFIG_TCG_INFINEON) += tpm_infineon.o

drivers/char/tpm/tpm_infineon.c

0 → 100644

+467 −0

Original line number	Diff line number	Diff line
		/*
		* Description:
		* Device Driver for the Infineon Technologies
		* SLD 9630 TT Trusted Platform Module
		* Specifications at www.trustedcomputinggroup.org
		*
		* Copyright (C) 2005, Marcel Selhorst <selhorst@crypto.rub.de>
		* Applied Data Security Group, Ruhr-University Bochum, Germany
		* Project-Homepage: http://www.prosec.rub.de/tpm
		*
		* 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 "tpm.h"

		/* Infineon specific definitions */
		/* maximum number of WTX-packages */
		#define TPM_MAX_WTX_PACKAGES 50
		/* msleep-Time for WTX-packages */
		#define TPM_WTX_MSLEEP_TIME 20
		/* msleep-Time --> Interval to check status register */
		#define TPM_MSLEEP_TIME 3
		/* gives number of max. msleep()-calls before throwing timeout */
		#define TPM_MAX_TRIES 5000
		#define TCPA_INFINEON_DEV_VEN_VALUE 0x15D1
		#define TPM_DATA (TPM_ADDR + 1) & 0xff

		/* TPM header definitions */
		enum infineon_tpm_header {
		TPM_VL_VER = 0x01,
		TPM_VL_CHANNEL_CONTROL = 0x07,
		TPM_VL_CHANNEL_PERSONALISATION = 0x0A,
		TPM_VL_CHANNEL_TPM = 0x0B,
		TPM_VL_CONTROL = 0x00,
		TPM_INF_NAK = 0x15,
		TPM_CTRL_WTX = 0x10,
		TPM_CTRL_WTX_ABORT = 0x18,
		TPM_CTRL_WTX_ABORT_ACK = 0x18,
		TPM_CTRL_ERROR = 0x20,
		TPM_CTRL_CHAININGACK = 0x40,
		TPM_CTRL_CHAINING = 0x80,
		TPM_CTRL_DATA = 0x04,
		TPM_CTRL_DATA_CHA = 0x84,
		TPM_CTRL_DATA_CHA_ACK = 0xC4
		};

		enum infineon_tpm_register {
		WRFIFO = 0x00,
		RDFIFO = 0x01,
		STAT = 0x02,
		CMD = 0x03
		};

		enum infineon_tpm_command_bits {
		CMD_DIS = 0x00,
		CMD_LP = 0x01,
		CMD_RES = 0x02,
		CMD_IRQC = 0x06
		};

		enum infineon_tpm_status_bits {
		STAT_XFE = 0x00,
		STAT_LPA = 0x01,
		STAT_FOK = 0x02,
		STAT_TOK = 0x03,
		STAT_IRQA = 0x06,
		STAT_RDA = 0x07
		};

		/* some outgoing values */
		enum infineon_tpm_values {
		CHIP_ID1 = 0x20,
		CHIP_ID2 = 0x21,
		DAR = 0x30,
		RESET_LP_IRQC_DISABLE = 0x41,
		ENABLE_REGISTER_PAIR = 0x55,
		IOLIMH = 0x60,
		IOLIML = 0x61,
		DISABLE_REGISTER_PAIR = 0xAA,
		IDVENL = 0xF1,
		IDVENH = 0xF2,
		IDPDL = 0xF3,
		IDPDH = 0xF4
		};

		static int number_of_wtx;

		static int empty_fifo(struct tpm_chip *chip, int clear_wrfifo)
		{
		int status;
		int check = 0;
		int i;

		if (clear_wrfifo) {
		for (i = 0; i < 4096; i++) {
		status = inb(chip->vendor->base + WRFIFO);
		if (status == 0xff) {
		if (check == 5)
		break;
		else
		check++;
		}
		}
		}
		/* Note: The values which are currently in the FIFO of the TPM
		are thrown away since there is no usage for them. Usually,
		this has nothing to say, since the TPM will give its answer
		immediately or will be aborted anyway, so the data here is
		usually garbage and useless.
		We have to clean this, because the next communication with
		the TPM would be rubbish, if there is still some old data
		in the Read FIFO.
		*/
		i = 0;
		do {
		status = inb(chip->vendor->base + RDFIFO);
		status = inb(chip->vendor->base + STAT);
		i++;
		if (i == TPM_MAX_TRIES)
		return -EIO;
		} while ((status & (1 << STAT_RDA)) != 0);
		return 0;
		}

		static int wait(struct tpm_chip *chip, int wait_for_bit)
		{
		int status;
		int i;
		for (i = 0; i < TPM_MAX_TRIES; i++) {
		status = inb(chip->vendor->base + STAT);
		/* check the status-register if wait_for_bit is set */
		if (status & 1 << wait_for_bit)
		break;
		msleep(TPM_MSLEEP_TIME);
		}
		if (i == TPM_MAX_TRIES) { /* timeout occurs */
		if (wait_for_bit == STAT_XFE)
		dev_err(&chip->pci_dev->dev,
		"Timeout in wait(STAT_XFE)\n");
		if (wait_for_bit == STAT_RDA)
		dev_err(&chip->pci_dev->dev,
		"Timeout in wait(STAT_RDA)\n");
		return -EIO;
		}
		return 0;
		};

		static void wait_and_send(struct tpm_chip *chip, u8 sendbyte)
		{
		wait(chip, STAT_XFE);
		outb(sendbyte, chip->vendor->base + WRFIFO);
		}

		/* Note: WTX means Waiting-Time-Extension. Whenever the TPM needs more
		calculation time, it sends a WTX-package, which has to be acknowledged
		or aborted. This usually occurs if you are hammering the TPM with key
		creation. Set the maximum number of WTX-packages in the definitions
		above, if the number is reached, the waiting-time will be denied
		and the TPM command has to be resend.
		*/

		static void tpm_wtx(struct tpm_chip *chip)
		{
		number_of_wtx++;
		dev_info(&chip->pci_dev->dev, "Granting WTX (%02d / %02d)\n",
		number_of_wtx, TPM_MAX_WTX_PACKAGES);
		wait_and_send(chip, TPM_VL_VER);
		wait_and_send(chip, TPM_CTRL_WTX);
		wait_and_send(chip, 0x00);
		wait_and_send(chip, 0x00);
		msleep(TPM_WTX_MSLEEP_TIME);
		}

		static void tpm_wtx_abort(struct tpm_chip *chip)
		{
		dev_info(&chip->pci_dev->dev, "Aborting WTX\n");
		wait_and_send(chip, TPM_VL_VER);
		wait_and_send(chip, TPM_CTRL_WTX_ABORT);
		wait_and_send(chip, 0x00);
		wait_and_send(chip, 0x00);
		number_of_wtx = 0;
		msleep(TPM_WTX_MSLEEP_TIME);
		}

		static int tpm_inf_recv(struct tpm_chip chip, u8 buf, size_t count)
		{
		int i;
		int ret;
		u32 size = 0;

		recv_begin:
		/* start receiving header */
		for (i = 0; i < 4; i++) {
		ret = wait(chip, STAT_RDA);
		if (ret)
		return -EIO;
		buf[i] = inb(chip->vendor->base + RDFIFO);
		}

		if (buf[0] != TPM_VL_VER) {
		dev_err(&chip->pci_dev->dev,
		"Wrong transport protocol implementation!\n");
		return -EIO;
		}

		if (buf[1] == TPM_CTRL_DATA) {
		/* size of the data received */
		size = ((buf[2] << 8) \| buf[3]);

		for (i = 0; i < size; i++) {
		wait(chip, STAT_RDA);
		buf[i] = inb(chip->vendor->base + RDFIFO);
		}

		if ((size == 0x6D00) && (buf[1] == 0x80)) {
		dev_err(&chip->pci_dev->dev,
		"Error handling on vendor layer!\n");
		return -EIO;
		}

		for (i = 0; i < size; i++)
		buf[i] = buf[i + 6];

		size = size - 6;
		return size;
		}

		if (buf[1] == TPM_CTRL_WTX) {
		dev_info(&chip->pci_dev->dev, "WTX-package received\n");
		if (number_of_wtx < TPM_MAX_WTX_PACKAGES) {
		tpm_wtx(chip);
		goto recv_begin;
		} else {
		tpm_wtx_abort(chip);
		goto recv_begin;
		}
		}

		if (buf[1] == TPM_CTRL_WTX_ABORT_ACK) {
		dev_info(&chip->pci_dev->dev, "WTX-abort acknowledged\n");
		return size;
		}

		if (buf[1] == TPM_CTRL_ERROR) {
		dev_err(&chip->pci_dev->dev, "ERROR-package received:\n");
		if (buf[4] == TPM_INF_NAK)
		dev_err(&chip->pci_dev->dev,
		"-> Negative acknowledgement"
		" - retransmit command!\n");
		return -EIO;
		}
		return -EIO;
		}

		static int tpm_inf_send(struct tpm_chip chip, u8 buf, size_t count)
		{
		int i;
		int ret;
		u8 count_high, count_low, count_4, count_3, count_2, count_1;

		/* Disabling Reset, LP and IRQC */
		outb(RESET_LP_IRQC_DISABLE, chip->vendor->base + CMD);

		ret = empty_fifo(chip, 1);
		if (ret) {
		dev_err(&chip->pci_dev->dev, "Timeout while clearing FIFO\n");
		return -EIO;
		}

		ret = wait(chip, STAT_XFE);
		if (ret)
		return -EIO;

		count_4 = (count & 0xff000000) >> 24;
		count_3 = (count & 0x00ff0000) >> 16;
		count_2 = (count & 0x0000ff00) >> 8;
		count_1 = (count & 0x000000ff);
		count_high = ((count + 6) & 0xffffff00) >> 8;
		count_low = ((count + 6) & 0x000000ff);

		/* Sending Header */
		wait_and_send(chip, TPM_VL_VER);
		wait_and_send(chip, TPM_CTRL_DATA);
		wait_and_send(chip, count_high);
		wait_and_send(chip, count_low);

		/* Sending Data Header */
		wait_and_send(chip, TPM_VL_VER);
		wait_and_send(chip, TPM_VL_CHANNEL_TPM);
		wait_and_send(chip, count_4);
		wait_and_send(chip, count_3);
		wait_and_send(chip, count_2);
		wait_and_send(chip, count_1);

		/* Sending Data */
		for (i = 0; i < count; i++) {
		wait_and_send(chip, buf[i]);
		}
		return count;
		}

		static void tpm_inf_cancel(struct tpm_chip *chip)
		{
		/* Nothing yet!
		This has something to do with the internal functions
		of the TPM. Abort isn't really necessary...
		*/
		}

		static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
		static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
		static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps, NULL);
		static DEVICE_ATTR(cancel, S_IWUSR \| S_IWGRP, NULL, tpm_store_cancel);

		static struct attribute *inf_attrs[] = {
		&dev_attr_pubek.attr,
		&dev_attr_pcrs.attr,
		&dev_attr_caps.attr,
		&dev_attr_cancel.attr,
		NULL,
		};

		static struct attribute_group inf_attr_grp = {.attrs = inf_attrs };

		static struct file_operations inf_ops = {
		.owner = THIS_MODULE,
		.llseek = no_llseek,
		.open = tpm_open,
		.read = tpm_read,
		.write = tpm_write,
		.release = tpm_release,
		};

		static struct tpm_vendor_specific tpm_inf = {
		.recv = tpm_inf_recv,
		.send = tpm_inf_send,
		.cancel = tpm_inf_cancel,
		.req_complete_mask = 0,
		.req_complete_val = 0,
		.attr_group = &inf_attr_grp,
		.miscdev = {.fops = &inf_ops,},
		};

		static int __devinit tpm_inf_probe(struct pci_dev *pci_dev,
		const struct pci_device_id *pci_id)
		{
		int rc = 0;
		u8 iol, ioh;
		int vendorid[2];
		int version[2];
		int productid[2];

		if (pci_enable_device(pci_dev))
		return -EIO;

		dev_info(&pci_dev->dev, "LPC-bus found at 0x%x\n", pci_id->device);

		/* query chip for its vendor, its version number a.s.o. */
		outb(ENABLE_REGISTER_PAIR, TPM_ADDR);
		outb(IDVENL, TPM_ADDR);
		vendorid[1] = inb(TPM_DATA);
		outb(IDVENH, TPM_ADDR);
		vendorid[0] = inb(TPM_DATA);
		outb(IDPDL, TPM_ADDR);
		productid[1] = inb(TPM_DATA);
		outb(IDPDH, TPM_ADDR);
		productid[0] = inb(TPM_DATA);
		outb(CHIP_ID1, TPM_ADDR);
		version[1] = inb(TPM_DATA);
		outb(CHIP_ID2, TPM_ADDR);
		version[0] = inb(TPM_DATA);

		if ((vendorid[0] << 8 \| vendorid[1]) == (TCPA_INFINEON_DEV_VEN_VALUE)) {

		/* read IO-ports from TPM */
		outb(IOLIMH, TPM_ADDR);
		ioh = inb(TPM_DATA);
		outb(IOLIML, TPM_ADDR);
		iol = inb(TPM_DATA);
		tpm_inf.base = (ioh << 8) \| iol;

		if (tpm_inf.base == 0) {
		dev_err(&pci_dev->dev, "No IO-ports set!\n");
		pci_disable_device(pci_dev);
		return -ENODEV;
		}

		/* activate register */
		outb(DAR, TPM_ADDR);
		outb(0x01, TPM_DATA);
		outb(DISABLE_REGISTER_PAIR, TPM_ADDR);

		/* disable RESET, LP and IRQC */
		outb(RESET_LP_IRQC_DISABLE, tpm_inf.base + CMD);

		/* Finally, we're done, print some infos */
		dev_info(&pci_dev->dev, "TPM found: "
		"io base 0x%x, "
		"chip version %02x%02x, "
		"vendor id %x%x (Infineon), "
		"product id %02x%02x"
		"%s\n",
		tpm_inf.base,
		version[0], version[1],
		vendorid[0], vendorid[1],
		productid[0], productid[1], ((productid[0] == 0)
		&& (productid[1] ==
		6)) ?
		" (SLD 9630 TT 1.1)" : "");

		rc = tpm_register_hardware(pci_dev, &tpm_inf);
		if (rc < 0) {
		pci_disable_device(pci_dev);
		return -ENODEV;
		}
		return 0;
		} else {
		dev_info(&pci_dev->dev, "No Infineon TPM found!\n");
		pci_disable_device(pci_dev);
		return -ENODEV;
		}
		}

		static struct pci_device_id tpm_pci_tbl[] __devinitdata = {
		{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0)},
		{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12)},
		{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0)},
		{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12)},
		{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0)},
		{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_0)},
		{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_1)},
		{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_2)},
		{0,}
		};

		MODULE_DEVICE_TABLE(pci, tpm_pci_tbl);

		static struct pci_driver inf_pci_driver = {
		.name = "tpm_inf",
		.id_table = tpm_pci_tbl,
		.probe = tpm_inf_probe,
		.remove = __devexit_p(tpm_remove),
		.suspend = tpm_pm_suspend,
		.resume = tpm_pm_resume,
		};

		static int __init init_inf(void)
		{
		return pci_register_driver(&inf_pci_driver);
		}

		static void __exit cleanup_inf(void)
		{
		pci_unregister_driver(&inf_pci_driver);
		}

		module_init(init_inf);
		module_exit(cleanup_inf);

		MODULE_AUTHOR("Marcel Selhorst <selhorst@crypto.rub.de>");
		MODULE_DESCRIPTION("Driver for Infineon TPM SLD 9630 TT");
		MODULE_VERSION("1.4");
		MODULE_LICENSE("GPL");

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