630 lines
16 KiB
C
630 lines
16 KiB
C
/*
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* Description:
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* Device Driver for the Infineon Technologies
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* SLD 9630 TT 1.1 and SLB 9635 TT 1.2 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 <tpmdd@selhorst.net>
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* Sirrix AG - security technologies <tpmdd@sirrix.com> and
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* Applied Data Security Group, Ruhr-University Bochum, Germany
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* Project-Homepage: http://www.trust.rub.de/projects/linux-device-driver-infineon-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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#include <linux/init.h>
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#include <linux/pnp.h>
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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 TPM_INFINEON_DEV_VEN_VALUE 0x15D1
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#define TPM_INF_IO_PORT 0x0
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#define TPM_INF_IO_MEM 0x1
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#define TPM_INF_ADDR 0x0
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#define TPM_INF_DATA 0x1
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struct tpm_inf_dev {
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int iotype;
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void __iomem *mem_base; /* MMIO ioremap'd addr */
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unsigned long map_base; /* phys MMIO base */
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unsigned long map_size; /* MMIO region size */
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unsigned int index_off; /* index register offset */
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unsigned int data_regs; /* Data registers */
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unsigned int data_size;
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unsigned int config_port; /* IO Port config index reg */
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unsigned int config_size;
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};
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static struct tpm_inf_dev tpm_dev;
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static inline void tpm_data_out(unsigned char data, unsigned char offset)
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{
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if (tpm_dev.iotype == TPM_INF_IO_PORT)
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outb(data, tpm_dev.data_regs + offset);
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else
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writeb(data, tpm_dev.mem_base + tpm_dev.data_regs + offset);
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}
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static inline unsigned char tpm_data_in(unsigned char offset)
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{
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if (tpm_dev.iotype == TPM_INF_IO_PORT)
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return inb(tpm_dev.data_regs + offset);
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else
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return readb(tpm_dev.mem_base + tpm_dev.data_regs + offset);
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}
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static inline void tpm_config_out(unsigned char data, unsigned char offset)
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{
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if (tpm_dev.iotype == TPM_INF_IO_PORT)
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outb(data, tpm_dev.config_port + offset);
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else
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writeb(data, tpm_dev.mem_base + tpm_dev.index_off + offset);
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}
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static inline unsigned char tpm_config_in(unsigned char offset)
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{
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if (tpm_dev.iotype == TPM_INF_IO_PORT)
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return inb(tpm_dev.config_port + offset);
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else
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return readb(tpm_dev.mem_base + tpm_dev.index_off + offset);
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}
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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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TPM_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 = tpm_data_in(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 = tpm_data_in(RDFIFO);
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status = tpm_data_in(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 = tpm_data_in(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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tpm_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->dev, "Timeout in wait(STAT_XFE)\n");
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if (wait_for_bit == STAT_RDA)
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dev_err(&chip->dev, "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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tpm_data_out(sendbyte, 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->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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tpm_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->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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tpm_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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number_of_wtx = 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] = tpm_data_in(RDFIFO);
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}
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if (buf[0] != TPM_VL_VER) {
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dev_err(&chip->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] = tpm_data_in(RDFIFO);
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}
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if ((size == 0x6D00) && (buf[1] == 0x80)) {
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dev_err(&chip->dev, "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->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->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->dev, "ERROR-package received:\n");
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if (buf[4] == TPM_INF_NAK)
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dev_err(&chip->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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tpm_data_out(RESET_LP_IRQC_DISABLE, CMD);
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ret = empty_fifo(chip, 1);
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if (ret) {
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dev_err(&chip->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 0;
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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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/*
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Since we are using the legacy mode to communicate
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with the TPM, we have no cancel functions, but have
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a workaround for interrupting the TPM through WTX.
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*/
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}
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static u8 tpm_inf_status(struct tpm_chip *chip)
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{
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return tpm_data_in(STAT);
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}
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static const struct tpm_class_ops 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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.status = tpm_inf_status,
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.req_complete_mask = 0,
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.req_complete_val = 0,
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};
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static const struct pnp_device_id tpm_inf_pnp_tbl[] = {
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/* Infineon TPMs */
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{"IFX0101", 0},
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{"IFX0102", 0},
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{"", 0}
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};
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MODULE_DEVICE_TABLE(pnp, tpm_inf_pnp_tbl);
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static int tpm_inf_pnp_probe(struct pnp_dev *dev,
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const struct pnp_device_id *dev_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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const char *chipname;
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struct tpm_chip *chip;
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/* read IO-ports through PnP */
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if (pnp_port_valid(dev, 0) && pnp_port_valid(dev, 1) &&
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!(pnp_port_flags(dev, 0) & IORESOURCE_DISABLED)) {
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tpm_dev.iotype = TPM_INF_IO_PORT;
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tpm_dev.config_port = pnp_port_start(dev, 0);
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tpm_dev.config_size = pnp_port_len(dev, 0);
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tpm_dev.data_regs = pnp_port_start(dev, 1);
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tpm_dev.data_size = pnp_port_len(dev, 1);
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if ((tpm_dev.data_size < 4) || (tpm_dev.config_size < 2)) {
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rc = -EINVAL;
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goto err_last;
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}
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dev_info(&dev->dev, "Found %s with ID %s\n",
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dev->name, dev_id->id);
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if (!((tpm_dev.data_regs >> 8) & 0xff)) {
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rc = -EINVAL;
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goto err_last;
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}
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/* publish my base address and request region */
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if (request_region(tpm_dev.data_regs, tpm_dev.data_size,
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"tpm_infineon0") == NULL) {
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rc = -EINVAL;
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goto err_last;
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}
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if (request_region(tpm_dev.config_port, tpm_dev.config_size,
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"tpm_infineon0") == NULL) {
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release_region(tpm_dev.data_regs, tpm_dev.data_size);
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rc = -EINVAL;
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goto err_last;
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}
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} else if (pnp_mem_valid(dev, 0) &&
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!(pnp_mem_flags(dev, 0) & IORESOURCE_DISABLED)) {
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tpm_dev.iotype = TPM_INF_IO_MEM;
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tpm_dev.map_base = pnp_mem_start(dev, 0);
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tpm_dev.map_size = pnp_mem_len(dev, 0);
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dev_info(&dev->dev, "Found %s with ID %s\n",
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dev->name, dev_id->id);
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/* publish my base address and request region */
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if (request_mem_region(tpm_dev.map_base, tpm_dev.map_size,
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"tpm_infineon0") == NULL) {
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rc = -EINVAL;
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goto err_last;
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}
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tpm_dev.mem_base = ioremap(tpm_dev.map_base, tpm_dev.map_size);
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if (tpm_dev.mem_base == NULL) {
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release_mem_region(tpm_dev.map_base, tpm_dev.map_size);
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rc = -EINVAL;
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goto err_last;
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}
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/*
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* The only known MMIO based Infineon TPM system provides
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* a single large mem region with the device config
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* registers at the default TPM_ADDR. The data registers
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* seem like they could be placed anywhere within the MMIO
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* region, but lets just put them at zero offset.
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*/
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tpm_dev.index_off = TPM_ADDR;
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tpm_dev.data_regs = 0x0;
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} else {
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rc = -EINVAL;
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goto err_last;
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}
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/* query chip for its vendor, its version number a.s.o. */
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tpm_config_out(ENABLE_REGISTER_PAIR, TPM_INF_ADDR);
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tpm_config_out(IDVENL, TPM_INF_ADDR);
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vendorid[1] = tpm_config_in(TPM_INF_DATA);
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tpm_config_out(IDVENH, TPM_INF_ADDR);
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vendorid[0] = tpm_config_in(TPM_INF_DATA);
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tpm_config_out(IDPDL, TPM_INF_ADDR);
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productid[1] = tpm_config_in(TPM_INF_DATA);
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tpm_config_out(IDPDH, TPM_INF_ADDR);
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productid[0] = tpm_config_in(TPM_INF_DATA);
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tpm_config_out(CHIP_ID1, TPM_INF_ADDR);
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version[1] = tpm_config_in(TPM_INF_DATA);
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tpm_config_out(CHIP_ID2, TPM_INF_ADDR);
|
|
version[0] = tpm_config_in(TPM_INF_DATA);
|
|
|
|
switch ((productid[0] << 8) | productid[1]) {
|
|
case 6:
|
|
chipname = " (SLD 9630 TT 1.1)";
|
|
break;
|
|
case 11:
|
|
chipname = " (SLB 9635 TT 1.2)";
|
|
break;
|
|
default:
|
|
chipname = " (unknown chip)";
|
|
break;
|
|
}
|
|
|
|
if ((vendorid[0] << 8 | vendorid[1]) == (TPM_INFINEON_DEV_VEN_VALUE)) {
|
|
|
|
/* configure TPM with IO-ports */
|
|
tpm_config_out(IOLIMH, TPM_INF_ADDR);
|
|
tpm_config_out((tpm_dev.data_regs >> 8) & 0xff, TPM_INF_DATA);
|
|
tpm_config_out(IOLIML, TPM_INF_ADDR);
|
|
tpm_config_out((tpm_dev.data_regs & 0xff), TPM_INF_DATA);
|
|
|
|
/* control if IO-ports are set correctly */
|
|
tpm_config_out(IOLIMH, TPM_INF_ADDR);
|
|
ioh = tpm_config_in(TPM_INF_DATA);
|
|
tpm_config_out(IOLIML, TPM_INF_ADDR);
|
|
iol = tpm_config_in(TPM_INF_DATA);
|
|
|
|
if ((ioh << 8 | iol) != tpm_dev.data_regs) {
|
|
dev_err(&dev->dev,
|
|
"Could not set IO-data registers to 0x%x\n",
|
|
tpm_dev.data_regs);
|
|
rc = -EIO;
|
|
goto err_release_region;
|
|
}
|
|
|
|
/* activate register */
|
|
tpm_config_out(TPM_DAR, TPM_INF_ADDR);
|
|
tpm_config_out(0x01, TPM_INF_DATA);
|
|
tpm_config_out(DISABLE_REGISTER_PAIR, TPM_INF_ADDR);
|
|
|
|
/* disable RESET, LP and IRQC */
|
|
tpm_data_out(RESET_LP_IRQC_DISABLE, CMD);
|
|
|
|
/* Finally, we're done, print some infos */
|
|
dev_info(&dev->dev, "TPM found: "
|
|
"config base 0x%lx, "
|
|
"data base 0x%lx, "
|
|
"chip version 0x%02x%02x, "
|
|
"vendor id 0x%x%x (Infineon), "
|
|
"product id 0x%02x%02x"
|
|
"%s\n",
|
|
tpm_dev.iotype == TPM_INF_IO_PORT ?
|
|
tpm_dev.config_port :
|
|
tpm_dev.map_base + tpm_dev.index_off,
|
|
tpm_dev.iotype == TPM_INF_IO_PORT ?
|
|
tpm_dev.data_regs :
|
|
tpm_dev.map_base + tpm_dev.data_regs,
|
|
version[0], version[1],
|
|
vendorid[0], vendorid[1],
|
|
productid[0], productid[1], chipname);
|
|
|
|
chip = tpmm_chip_alloc(&dev->dev, &tpm_inf);
|
|
if (IS_ERR(chip)) {
|
|
rc = PTR_ERR(chip);
|
|
goto err_release_region;
|
|
}
|
|
|
|
rc = tpm_chip_register(chip);
|
|
if (rc)
|
|
goto err_release_region;
|
|
|
|
return 0;
|
|
} else {
|
|
rc = -ENODEV;
|
|
goto err_release_region;
|
|
}
|
|
|
|
err_release_region:
|
|
if (tpm_dev.iotype == TPM_INF_IO_PORT) {
|
|
release_region(tpm_dev.data_regs, tpm_dev.data_size);
|
|
release_region(tpm_dev.config_port, tpm_dev.config_size);
|
|
} else {
|
|
iounmap(tpm_dev.mem_base);
|
|
release_mem_region(tpm_dev.map_base, tpm_dev.map_size);
|
|
}
|
|
|
|
err_last:
|
|
return rc;
|
|
}
|
|
|
|
static void tpm_inf_pnp_remove(struct pnp_dev *dev)
|
|
{
|
|
struct tpm_chip *chip = pnp_get_drvdata(dev);
|
|
|
|
tpm_chip_unregister(chip);
|
|
|
|
if (tpm_dev.iotype == TPM_INF_IO_PORT) {
|
|
release_region(tpm_dev.data_regs, tpm_dev.data_size);
|
|
release_region(tpm_dev.config_port,
|
|
tpm_dev.config_size);
|
|
} else {
|
|
iounmap(tpm_dev.mem_base);
|
|
release_mem_region(tpm_dev.map_base, tpm_dev.map_size);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int tpm_inf_resume(struct device *dev)
|
|
{
|
|
/* Re-configure TPM after suspending */
|
|
tpm_config_out(ENABLE_REGISTER_PAIR, TPM_INF_ADDR);
|
|
tpm_config_out(IOLIMH, TPM_INF_ADDR);
|
|
tpm_config_out((tpm_dev.data_regs >> 8) & 0xff, TPM_INF_DATA);
|
|
tpm_config_out(IOLIML, TPM_INF_ADDR);
|
|
tpm_config_out((tpm_dev.data_regs & 0xff), TPM_INF_DATA);
|
|
/* activate register */
|
|
tpm_config_out(TPM_DAR, TPM_INF_ADDR);
|
|
tpm_config_out(0x01, TPM_INF_DATA);
|
|
tpm_config_out(DISABLE_REGISTER_PAIR, TPM_INF_ADDR);
|
|
/* disable RESET, LP and IRQC */
|
|
tpm_data_out(RESET_LP_IRQC_DISABLE, CMD);
|
|
return tpm_pm_resume(dev);
|
|
}
|
|
#endif
|
|
static SIMPLE_DEV_PM_OPS(tpm_inf_pm, tpm_pm_suspend, tpm_inf_resume);
|
|
|
|
static struct pnp_driver tpm_inf_pnp_driver = {
|
|
.name = "tpm_inf_pnp",
|
|
.id_table = tpm_inf_pnp_tbl,
|
|
.probe = tpm_inf_pnp_probe,
|
|
.remove = tpm_inf_pnp_remove,
|
|
.driver = {
|
|
.pm = &tpm_inf_pm,
|
|
}
|
|
};
|
|
|
|
module_pnp_driver(tpm_inf_pnp_driver);
|
|
|
|
MODULE_AUTHOR("Marcel Selhorst <tpmdd@sirrix.com>");
|
|
MODULE_DESCRIPTION("Driver for Infineon TPM SLD 9630 TT 1.1 / SLB 9635 TT 1.2");
|
|
MODULE_VERSION("1.9.2");
|
|
MODULE_LICENSE("GPL");
|