[PATCH] tpm: Support for Infineon TPM
This patch provides a new device driver for the Infineon SLD 9630 TT Trusted Platform Module (TPM 1.1b) [1] which is embedded on Intel- mainboards or in HP/ Fujitsu-Siemens / Toshiba-Notebooks. A nearly complete list where this module is integrated in can be found in [2]. This kernel module acts as a communication gateway between the linux kernel and the hardware chip and fits the TPM-specific interfaces created by IBM in drivers/char/tpm/tpm.h Further information about this module and a list of succesfully tested and therefore supported hardware can be found at our project page [3]. [1] http://www.infineon.com/cgi/ecrm.dll/ecrm/scripts/public_download.jsp?oid=114135&parent_oid=29049 [2] http://www.tonymcfadden.net/tpmvendors.htm [3] http://www.prosec.rub.de/tpm Signed-off-by: Marcel Selhorst <selhorst@crypto.rub.de> Acked-by: Kylene Jo Hall <kjhall@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Marcel Selhorst
Linus Torvalds
parent
e77e17161c
commit
ebb81fdb3d
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@ -35,5 +35,16 @@ config TCG_ATMEL
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will be accessible from within Linux. To compile this driver
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as a module, choose M here; the module will be called tpm_atmel.
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config TCG_INFINEON
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tristate "Infineon Technologies SLD 9630 TPM Interface"
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depends on TCG_TPM
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---help---
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If you have a TPM security chip from Infineon Technologies
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say Yes and it will be accessible from within Linux. To
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compile this driver as a module, choose M here; the module
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will be called tpm_infineon.
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Further information on this driver and the supported hardware
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can be found at http://www.prosec.rub.de/tpm
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endmenu
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@ -4,4 +4,4 @@
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obj-$(CONFIG_TCG_TPM) += tpm.o
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obj-$(CONFIG_TCG_NSC) += tpm_nsc.o
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obj-$(CONFIG_TCG_ATMEL) += tpm_atmel.o
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obj-$(CONFIG_TCG_INFINEON) += tpm_infineon.o
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467
drivers/char/tpm/tpm_infineon.c
Normal file
467
drivers/char/tpm/tpm_infineon.c
Normal file
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@ -0,0 +1,467 @@
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/*
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* Description:
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* Device Driver for the Infineon Technologies
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* SLD 9630 TT Trusted Platform Module
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* Specifications at www.trustedcomputinggroup.org
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*
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* Copyright (C) 2005, Marcel Selhorst <selhorst@crypto.rub.de>
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* Applied Data Security Group, Ruhr-University Bochum, Germany
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* Project-Homepage: http://www.prosec.rub.de/tpm
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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 "tpm.h"
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/* Infineon specific definitions */
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/* maximum number of WTX-packages */
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#define TPM_MAX_WTX_PACKAGES 50
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/* msleep-Time for WTX-packages */
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#define TPM_WTX_MSLEEP_TIME 20
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/* msleep-Time --> Interval to check status register */
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#define TPM_MSLEEP_TIME 3
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/* gives number of max. msleep()-calls before throwing timeout */
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#define TPM_MAX_TRIES 5000
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#define TCPA_INFINEON_DEV_VEN_VALUE 0x15D1
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#define TPM_DATA (TPM_ADDR + 1) & 0xff
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/* TPM header definitions */
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enum infineon_tpm_header {
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TPM_VL_VER = 0x01,
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TPM_VL_CHANNEL_CONTROL = 0x07,
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TPM_VL_CHANNEL_PERSONALISATION = 0x0A,
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TPM_VL_CHANNEL_TPM = 0x0B,
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TPM_VL_CONTROL = 0x00,
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TPM_INF_NAK = 0x15,
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TPM_CTRL_WTX = 0x10,
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TPM_CTRL_WTX_ABORT = 0x18,
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TPM_CTRL_WTX_ABORT_ACK = 0x18,
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TPM_CTRL_ERROR = 0x20,
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TPM_CTRL_CHAININGACK = 0x40,
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TPM_CTRL_CHAINING = 0x80,
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TPM_CTRL_DATA = 0x04,
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TPM_CTRL_DATA_CHA = 0x84,
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TPM_CTRL_DATA_CHA_ACK = 0xC4
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};
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enum infineon_tpm_register {
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WRFIFO = 0x00,
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RDFIFO = 0x01,
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STAT = 0x02,
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CMD = 0x03
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};
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enum infineon_tpm_command_bits {
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CMD_DIS = 0x00,
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CMD_LP = 0x01,
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CMD_RES = 0x02,
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CMD_IRQC = 0x06
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};
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enum infineon_tpm_status_bits {
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STAT_XFE = 0x00,
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STAT_LPA = 0x01,
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STAT_FOK = 0x02,
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STAT_TOK = 0x03,
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STAT_IRQA = 0x06,
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STAT_RDA = 0x07
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};
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/* some outgoing values */
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enum infineon_tpm_values {
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CHIP_ID1 = 0x20,
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CHIP_ID2 = 0x21,
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DAR = 0x30,
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RESET_LP_IRQC_DISABLE = 0x41,
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ENABLE_REGISTER_PAIR = 0x55,
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IOLIMH = 0x60,
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IOLIML = 0x61,
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DISABLE_REGISTER_PAIR = 0xAA,
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IDVENL = 0xF1,
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IDVENH = 0xF2,
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IDPDL = 0xF3,
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IDPDH = 0xF4
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};
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static int number_of_wtx;
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static int empty_fifo(struct tpm_chip *chip, int clear_wrfifo)
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{
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int status;
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int check = 0;
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int i;
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if (clear_wrfifo) {
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for (i = 0; i < 4096; i++) {
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status = inb(chip->vendor->base + WRFIFO);
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if (status == 0xff) {
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if (check == 5)
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break;
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else
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check++;
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}
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}
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}
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/* Note: The values which are currently in the FIFO of the TPM
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are thrown away since there is no usage for them. Usually,
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this has nothing to say, since the TPM will give its answer
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immediately or will be aborted anyway, so the data here is
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usually garbage and useless.
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We have to clean this, because the next communication with
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the TPM would be rubbish, if there is still some old data
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in the Read FIFO.
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*/
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i = 0;
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do {
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status = inb(chip->vendor->base + RDFIFO);
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status = inb(chip->vendor->base + STAT);
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i++;
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if (i == TPM_MAX_TRIES)
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return -EIO;
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} while ((status & (1 << STAT_RDA)) != 0);
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return 0;
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}
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static int wait(struct tpm_chip *chip, int wait_for_bit)
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{
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int status;
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int i;
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for (i = 0; i < TPM_MAX_TRIES; i++) {
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status = inb(chip->vendor->base + STAT);
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/* check the status-register if wait_for_bit is set */
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if (status & 1 << wait_for_bit)
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break;
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msleep(TPM_MSLEEP_TIME);
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}
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if (i == TPM_MAX_TRIES) { /* timeout occurs */
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if (wait_for_bit == STAT_XFE)
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dev_err(&chip->pci_dev->dev,
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"Timeout in wait(STAT_XFE)\n");
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if (wait_for_bit == STAT_RDA)
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dev_err(&chip->pci_dev->dev,
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"Timeout in wait(STAT_RDA)\n");
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return -EIO;
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}
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return 0;
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};
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static void wait_and_send(struct tpm_chip *chip, u8 sendbyte)
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{
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wait(chip, STAT_XFE);
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outb(sendbyte, chip->vendor->base + WRFIFO);
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}
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/* Note: WTX means Waiting-Time-Extension. Whenever the TPM needs more
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calculation time, it sends a WTX-package, which has to be acknowledged
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or aborted. This usually occurs if you are hammering the TPM with key
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creation. Set the maximum number of WTX-packages in the definitions
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above, if the number is reached, the waiting-time will be denied
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and the TPM command has to be resend.
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*/
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static void tpm_wtx(struct tpm_chip *chip)
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{
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number_of_wtx++;
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dev_info(&chip->pci_dev->dev, "Granting WTX (%02d / %02d)\n",
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number_of_wtx, TPM_MAX_WTX_PACKAGES);
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wait_and_send(chip, TPM_VL_VER);
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wait_and_send(chip, TPM_CTRL_WTX);
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wait_and_send(chip, 0x00);
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wait_and_send(chip, 0x00);
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msleep(TPM_WTX_MSLEEP_TIME);
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}
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static void tpm_wtx_abort(struct tpm_chip *chip)
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{
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dev_info(&chip->pci_dev->dev, "Aborting WTX\n");
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wait_and_send(chip, TPM_VL_VER);
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wait_and_send(chip, TPM_CTRL_WTX_ABORT);
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wait_and_send(chip, 0x00);
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wait_and_send(chip, 0x00);
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number_of_wtx = 0;
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msleep(TPM_WTX_MSLEEP_TIME);
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}
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static int tpm_inf_recv(struct tpm_chip *chip, u8 * buf, size_t count)
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{
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int i;
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int ret;
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u32 size = 0;
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recv_begin:
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/* start receiving header */
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for (i = 0; i < 4; i++) {
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ret = wait(chip, STAT_RDA);
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if (ret)
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return -EIO;
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buf[i] = inb(chip->vendor->base + RDFIFO);
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}
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if (buf[0] != TPM_VL_VER) {
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dev_err(&chip->pci_dev->dev,
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"Wrong transport protocol implementation!\n");
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return -EIO;
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}
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if (buf[1] == TPM_CTRL_DATA) {
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/* size of the data received */
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size = ((buf[2] << 8) | buf[3]);
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for (i = 0; i < size; i++) {
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wait(chip, STAT_RDA);
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buf[i] = inb(chip->vendor->base + RDFIFO);
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}
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if ((size == 0x6D00) && (buf[1] == 0x80)) {
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dev_err(&chip->pci_dev->dev,
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"Error handling on vendor layer!\n");
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return -EIO;
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}
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for (i = 0; i < size; i++)
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buf[i] = buf[i + 6];
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size = size - 6;
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return size;
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}
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if (buf[1] == TPM_CTRL_WTX) {
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dev_info(&chip->pci_dev->dev, "WTX-package received\n");
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if (number_of_wtx < TPM_MAX_WTX_PACKAGES) {
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tpm_wtx(chip);
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goto recv_begin;
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} else {
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tpm_wtx_abort(chip);
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goto recv_begin;
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}
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}
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if (buf[1] == TPM_CTRL_WTX_ABORT_ACK) {
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dev_info(&chip->pci_dev->dev, "WTX-abort acknowledged\n");
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return size;
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}
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if (buf[1] == TPM_CTRL_ERROR) {
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dev_err(&chip->pci_dev->dev, "ERROR-package received:\n");
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if (buf[4] == TPM_INF_NAK)
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dev_err(&chip->pci_dev->dev,
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"-> Negative acknowledgement"
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" - retransmit command!\n");
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return -EIO;
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}
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return -EIO;
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}
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static int tpm_inf_send(struct tpm_chip *chip, u8 * buf, size_t count)
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{
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int i;
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int ret;
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u8 count_high, count_low, count_4, count_3, count_2, count_1;
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/* Disabling Reset, LP and IRQC */
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outb(RESET_LP_IRQC_DISABLE, chip->vendor->base + CMD);
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ret = empty_fifo(chip, 1);
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if (ret) {
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dev_err(&chip->pci_dev->dev, "Timeout while clearing FIFO\n");
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return -EIO;
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}
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ret = wait(chip, STAT_XFE);
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if (ret)
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return -EIO;
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count_4 = (count & 0xff000000) >> 24;
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count_3 = (count & 0x00ff0000) >> 16;
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count_2 = (count & 0x0000ff00) >> 8;
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count_1 = (count & 0x000000ff);
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count_high = ((count + 6) & 0xffffff00) >> 8;
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count_low = ((count + 6) & 0x000000ff);
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/* Sending Header */
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wait_and_send(chip, TPM_VL_VER);
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wait_and_send(chip, TPM_CTRL_DATA);
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wait_and_send(chip, count_high);
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wait_and_send(chip, count_low);
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/* Sending Data Header */
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wait_and_send(chip, TPM_VL_VER);
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wait_and_send(chip, TPM_VL_CHANNEL_TPM);
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wait_and_send(chip, count_4);
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wait_and_send(chip, count_3);
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wait_and_send(chip, count_2);
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wait_and_send(chip, count_1);
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/* Sending Data */
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for (i = 0; i < count; i++) {
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wait_and_send(chip, buf[i]);
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}
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return count;
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}
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static void tpm_inf_cancel(struct tpm_chip *chip)
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{
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/* Nothing yet!
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This has something to do with the internal functions
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of the TPM. Abort isn't really necessary...
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*/
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}
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static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
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static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
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static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps, NULL);
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static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
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static struct attribute *inf_attrs[] = {
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&dev_attr_pubek.attr,
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&dev_attr_pcrs.attr,
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&dev_attr_caps.attr,
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&dev_attr_cancel.attr,
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NULL,
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};
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static struct attribute_group inf_attr_grp = {.attrs = inf_attrs };
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static struct file_operations inf_ops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.open = tpm_open,
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.read = tpm_read,
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.write = tpm_write,
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.release = tpm_release,
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};
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static struct tpm_vendor_specific tpm_inf = {
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.recv = tpm_inf_recv,
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.send = tpm_inf_send,
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.cancel = tpm_inf_cancel,
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.req_complete_mask = 0,
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.req_complete_val = 0,
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.attr_group = &inf_attr_grp,
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.miscdev = {.fops = &inf_ops,},
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};
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static int __devinit tpm_inf_probe(struct pci_dev *pci_dev,
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const struct pci_device_id *pci_id)
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{
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int rc = 0;
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u8 iol, ioh;
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int vendorid[2];
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int version[2];
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int productid[2];
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if (pci_enable_device(pci_dev))
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return -EIO;
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dev_info(&pci_dev->dev, "LPC-bus found at 0x%x\n", pci_id->device);
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/* query chip for its vendor, its version number a.s.o. */
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outb(ENABLE_REGISTER_PAIR, TPM_ADDR);
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outb(IDVENL, TPM_ADDR);
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vendorid[1] = inb(TPM_DATA);
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outb(IDVENH, TPM_ADDR);
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vendorid[0] = inb(TPM_DATA);
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outb(IDPDL, TPM_ADDR);
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productid[1] = inb(TPM_DATA);
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outb(IDPDH, TPM_ADDR);
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productid[0] = inb(TPM_DATA);
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outb(CHIP_ID1, TPM_ADDR);
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version[1] = inb(TPM_DATA);
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outb(CHIP_ID2, TPM_ADDR);
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version[0] = inb(TPM_DATA);
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if ((vendorid[0] << 8 | vendorid[1]) == (TCPA_INFINEON_DEV_VEN_VALUE)) {
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/* read IO-ports from TPM */
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outb(IOLIMH, TPM_ADDR);
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ioh = inb(TPM_DATA);
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outb(IOLIML, TPM_ADDR);
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iol = inb(TPM_DATA);
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tpm_inf.base = (ioh << 8) | iol;
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if (tpm_inf.base == 0) {
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dev_err(&pci_dev->dev, "No IO-ports set!\n");
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pci_disable_device(pci_dev);
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return -ENODEV;
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}
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/* activate register */
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outb(DAR, TPM_ADDR);
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outb(0x01, TPM_DATA);
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outb(DISABLE_REGISTER_PAIR, TPM_ADDR);
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/* disable RESET, LP and IRQC */
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outb(RESET_LP_IRQC_DISABLE, tpm_inf.base + CMD);
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/* Finally, we're done, print some infos */
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dev_info(&pci_dev->dev, "TPM found: "
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"io base 0x%x, "
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"chip version %02x%02x, "
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"vendor id %x%x (Infineon), "
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"product id %02x%02x"
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"%s\n",
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tpm_inf.base,
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version[0], version[1],
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vendorid[0], vendorid[1],
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productid[0], productid[1], ((productid[0] == 0)
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&& (productid[1] ==
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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");
|
||||
Loading…
Reference in a new issue