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![Maciej S. Szmigiero](/assets/img/avatar_default.png)
probe_itpm() function is supposed to send command without an itpm flag set and if this fails to repeat it, this time with the itpm flag set. However, commit41a5e1cf1f
("tpm/tpm_tis: Split tpm_tis driver into a core and TCG TIS compliant phy") moved the itpm flag from an "itpm" variable to a TPM_TIS_ITPM_POSSIBLE chip flag, so setting the (now function-local) itpm variable no longer had any effect. Finally, this function-local itpm variable was removed by commit56af322156
("tpm/tpm_tis: remove unused itpm variable") Tested only on non-iTPM TIS TPM. Signed-off-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
865 lines
21 KiB
C
865 lines
21 KiB
C
/*
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* Copyright (C) 2005, 2006 IBM Corporation
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* Copyright (C) 2014, 2015 Intel Corporation
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*
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* Authors:
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* Leendert van Doorn <leendert@watson.ibm.com>
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* Kylene Hall <kjhall@us.ibm.com>
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*
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* Maintained by: <tpmdd-devel@lists.sourceforge.net>
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*
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* Device driver for TCG/TCPA TPM (trusted platform module).
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* Specifications at www.trustedcomputinggroup.org
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*
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* This device driver implements the TPM interface as defined in
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* the TCG TPM Interface Spec version 1.2, revision 1.0.
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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/module.h>
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#include <linux/moduleparam.h>
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#include <linux/pnp.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/wait.h>
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#include <linux/acpi.h>
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#include <linux/freezer.h>
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#include "tpm.h"
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#include "tpm_tis_core.h"
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/* Before we attempt to access the TPM we must see that the valid bit is set.
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* The specification says that this bit is 0 at reset and remains 0 until the
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* 'TPM has gone through its self test and initialization and has established
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* correct values in the other bits.'
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*/
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static int wait_startup(struct tpm_chip *chip, int l)
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{
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struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
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unsigned long stop = jiffies + chip->timeout_a;
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do {
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int rc;
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u8 access;
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rc = tpm_tis_read8(priv, TPM_ACCESS(l), &access);
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if (rc < 0)
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return rc;
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if (access & TPM_ACCESS_VALID)
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return 0;
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msleep(TPM_TIMEOUT);
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} while (time_before(jiffies, stop));
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return -1;
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}
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static int check_locality(struct tpm_chip *chip, int l)
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{
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struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
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int rc;
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u8 access;
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rc = tpm_tis_read8(priv, TPM_ACCESS(l), &access);
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if (rc < 0)
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return rc;
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if ((access & (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
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(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
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return priv->locality = l;
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return -1;
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}
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static void release_locality(struct tpm_chip *chip, int l, int force)
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{
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struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
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int rc;
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u8 access;
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rc = tpm_tis_read8(priv, TPM_ACCESS(l), &access);
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if (rc < 0)
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return;
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if (force || (access &
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(TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) ==
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(TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID))
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tpm_tis_write8(priv, TPM_ACCESS(l), TPM_ACCESS_ACTIVE_LOCALITY);
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}
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static int request_locality(struct tpm_chip *chip, int l)
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{
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struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
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unsigned long stop, timeout;
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long rc;
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if (check_locality(chip, l) >= 0)
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return l;
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rc = tpm_tis_write8(priv, TPM_ACCESS(l), TPM_ACCESS_REQUEST_USE);
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if (rc < 0)
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return rc;
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stop = jiffies + chip->timeout_a;
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if (chip->flags & TPM_CHIP_FLAG_IRQ) {
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again:
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timeout = stop - jiffies;
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if ((long)timeout <= 0)
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return -1;
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rc = wait_event_interruptible_timeout(priv->int_queue,
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(check_locality
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(chip, l) >= 0),
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timeout);
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if (rc > 0)
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return l;
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if (rc == -ERESTARTSYS && freezing(current)) {
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clear_thread_flag(TIF_SIGPENDING);
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goto again;
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}
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} else {
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/* wait for burstcount */
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do {
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if (check_locality(chip, l) >= 0)
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return l;
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msleep(TPM_TIMEOUT);
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} while (time_before(jiffies, stop));
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}
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return -1;
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}
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static u8 tpm_tis_status(struct tpm_chip *chip)
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{
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struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
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int rc;
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u8 status;
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rc = tpm_tis_read8(priv, TPM_STS(priv->locality), &status);
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if (rc < 0)
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return 0;
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return status;
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}
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static void tpm_tis_ready(struct tpm_chip *chip)
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{
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struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
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/* this causes the current command to be aborted */
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tpm_tis_write8(priv, TPM_STS(priv->locality), TPM_STS_COMMAND_READY);
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}
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static int get_burstcount(struct tpm_chip *chip)
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{
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struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
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unsigned long stop;
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int burstcnt, rc;
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u32 value;
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/* wait for burstcount */
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/* which timeout value, spec has 2 answers (c & d) */
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stop = jiffies + chip->timeout_d;
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do {
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rc = tpm_tis_read32(priv, TPM_STS(priv->locality), &value);
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if (rc < 0)
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return rc;
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burstcnt = (value >> 8) & 0xFFFF;
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if (burstcnt)
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return burstcnt;
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msleep(TPM_TIMEOUT);
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} while (time_before(jiffies, stop));
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return -EBUSY;
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}
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static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
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{
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struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
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int size = 0, burstcnt, rc;
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while (size < count) {
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rc = wait_for_tpm_stat(chip,
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TPM_STS_DATA_AVAIL | TPM_STS_VALID,
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chip->timeout_c,
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&priv->read_queue, true);
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if (rc < 0)
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return rc;
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burstcnt = get_burstcount(chip);
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if (burstcnt < 0) {
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dev_err(&chip->dev, "Unable to read burstcount\n");
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return burstcnt;
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}
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burstcnt = min_t(int, burstcnt, count - size);
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rc = tpm_tis_read_bytes(priv, TPM_DATA_FIFO(priv->locality),
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burstcnt, buf + size);
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if (rc < 0)
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return rc;
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size += burstcnt;
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}
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return size;
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}
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static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count)
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{
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struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
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int size = 0;
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int expected, status;
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if (count < TPM_HEADER_SIZE) {
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size = -EIO;
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goto out;
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}
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size = recv_data(chip, buf, TPM_HEADER_SIZE);
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/* read first 10 bytes, including tag, paramsize, and result */
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if (size < TPM_HEADER_SIZE) {
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dev_err(&chip->dev, "Unable to read header\n");
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goto out;
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}
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expected = be32_to_cpu(*(__be32 *) (buf + 2));
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if (expected > count) {
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size = -EIO;
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goto out;
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}
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size += recv_data(chip, &buf[TPM_HEADER_SIZE],
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expected - TPM_HEADER_SIZE);
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if (size < expected) {
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dev_err(&chip->dev, "Unable to read remainder of result\n");
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size = -ETIME;
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goto out;
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}
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if (wait_for_tpm_stat(chip, TPM_STS_VALID, chip->timeout_c,
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&priv->int_queue, false) < 0) {
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size = -ETIME;
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goto out;
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}
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status = tpm_tis_status(chip);
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if (status & TPM_STS_DATA_AVAIL) { /* retry? */
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dev_err(&chip->dev, "Error left over data\n");
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size = -EIO;
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goto out;
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}
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out:
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tpm_tis_ready(chip);
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release_locality(chip, priv->locality, 0);
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return size;
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}
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/*
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* If interrupts are used (signaled by an irq set in the vendor structure)
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* tpm.c can skip polling for the data to be available as the interrupt is
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* waited for here
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*/
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static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
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{
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struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
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int rc, status, burstcnt;
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size_t count = 0;
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bool itpm = priv->flags & TPM_TIS_ITPM_WORKAROUND;
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if (request_locality(chip, 0) < 0)
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return -EBUSY;
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status = tpm_tis_status(chip);
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if ((status & TPM_STS_COMMAND_READY) == 0) {
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tpm_tis_ready(chip);
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if (wait_for_tpm_stat
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(chip, TPM_STS_COMMAND_READY, chip->timeout_b,
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&priv->int_queue, false) < 0) {
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rc = -ETIME;
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goto out_err;
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}
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}
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while (count < len - 1) {
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burstcnt = get_burstcount(chip);
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if (burstcnt < 0) {
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dev_err(&chip->dev, "Unable to read burstcount\n");
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rc = burstcnt;
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goto out_err;
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}
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burstcnt = min_t(int, burstcnt, len - count - 1);
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rc = tpm_tis_write_bytes(priv, TPM_DATA_FIFO(priv->locality),
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burstcnt, buf + count);
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if (rc < 0)
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goto out_err;
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count += burstcnt;
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if (wait_for_tpm_stat(chip, TPM_STS_VALID, chip->timeout_c,
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&priv->int_queue, false) < 0) {
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rc = -ETIME;
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goto out_err;
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}
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status = tpm_tis_status(chip);
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if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) {
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rc = -EIO;
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goto out_err;
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}
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}
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/* write last byte */
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rc = tpm_tis_write8(priv, TPM_DATA_FIFO(priv->locality), buf[count]);
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if (rc < 0)
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goto out_err;
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if (wait_for_tpm_stat(chip, TPM_STS_VALID, chip->timeout_c,
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&priv->int_queue, false) < 0) {
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rc = -ETIME;
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goto out_err;
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}
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status = tpm_tis_status(chip);
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if (!itpm && (status & TPM_STS_DATA_EXPECT) != 0) {
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rc = -EIO;
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goto out_err;
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}
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return 0;
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out_err:
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tpm_tis_ready(chip);
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release_locality(chip, priv->locality, 0);
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return rc;
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}
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static void disable_interrupts(struct tpm_chip *chip)
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{
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struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
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u32 intmask;
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int rc;
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rc = tpm_tis_read32(priv, TPM_INT_ENABLE(priv->locality), &intmask);
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if (rc < 0)
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intmask = 0;
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intmask &= ~TPM_GLOBAL_INT_ENABLE;
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rc = tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask);
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devm_free_irq(chip->dev.parent, priv->irq, chip);
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priv->irq = 0;
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chip->flags &= ~TPM_CHIP_FLAG_IRQ;
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}
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/*
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* If interrupts are used (signaled by an irq set in the vendor structure)
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* tpm.c can skip polling for the data to be available as the interrupt is
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* waited for here
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*/
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static int tpm_tis_send_main(struct tpm_chip *chip, u8 *buf, size_t len)
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{
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struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
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int rc;
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u32 ordinal;
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unsigned long dur;
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rc = tpm_tis_send_data(chip, buf, len);
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if (rc < 0)
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return rc;
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/* go and do it */
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rc = tpm_tis_write8(priv, TPM_STS(priv->locality), TPM_STS_GO);
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if (rc < 0)
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goto out_err;
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if (chip->flags & TPM_CHIP_FLAG_IRQ) {
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ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
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if (chip->flags & TPM_CHIP_FLAG_TPM2)
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dur = tpm2_calc_ordinal_duration(chip, ordinal);
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else
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dur = tpm_calc_ordinal_duration(chip, ordinal);
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if (wait_for_tpm_stat
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(chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID, dur,
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&priv->read_queue, false) < 0) {
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rc = -ETIME;
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goto out_err;
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}
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}
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return len;
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out_err:
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tpm_tis_ready(chip);
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release_locality(chip, priv->locality, 0);
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return rc;
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}
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static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
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{
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int rc, irq;
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struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
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if (!(chip->flags & TPM_CHIP_FLAG_IRQ) || priv->irq_tested)
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return tpm_tis_send_main(chip, buf, len);
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|
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/* Verify receipt of the expected IRQ */
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irq = priv->irq;
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priv->irq = 0;
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chip->flags &= ~TPM_CHIP_FLAG_IRQ;
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rc = tpm_tis_send_main(chip, buf, len);
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priv->irq = irq;
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chip->flags |= TPM_CHIP_FLAG_IRQ;
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if (!priv->irq_tested)
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msleep(1);
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if (!priv->irq_tested)
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disable_interrupts(chip);
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priv->irq_tested = true;
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return rc;
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}
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|
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struct tis_vendor_timeout_override {
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u32 did_vid;
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unsigned long timeout_us[4];
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};
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|
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static const struct tis_vendor_timeout_override vendor_timeout_overrides[] = {
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/* Atmel 3204 */
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{ 0x32041114, { (TIS_SHORT_TIMEOUT*1000), (TIS_LONG_TIMEOUT*1000),
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(TIS_SHORT_TIMEOUT*1000), (TIS_SHORT_TIMEOUT*1000) } },
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};
|
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|
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static bool tpm_tis_update_timeouts(struct tpm_chip *chip,
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unsigned long *timeout_cap)
|
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{
|
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struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
|
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int i, rc;
|
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u32 did_vid;
|
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|
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rc = tpm_tis_read32(priv, TPM_DID_VID(0), &did_vid);
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if (rc < 0)
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return rc;
|
|
|
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for (i = 0; i != ARRAY_SIZE(vendor_timeout_overrides); i++) {
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if (vendor_timeout_overrides[i].did_vid != did_vid)
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continue;
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memcpy(timeout_cap, vendor_timeout_overrides[i].timeout_us,
|
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sizeof(vendor_timeout_overrides[i].timeout_us));
|
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return true;
|
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}
|
|
|
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return false;
|
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}
|
|
|
|
/*
|
|
* Early probing for iTPM with STS_DATA_EXPECT flaw.
|
|
* Try sending command without itpm flag set and if that
|
|
* fails, repeat with itpm flag set.
|
|
*/
|
|
static int probe_itpm(struct tpm_chip *chip)
|
|
{
|
|
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
|
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int rc = 0;
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u8 cmd_getticks[] = {
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0x00, 0xc1, 0x00, 0x00, 0x00, 0x0a,
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0x00, 0x00, 0x00, 0xf1
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};
|
|
size_t len = sizeof(cmd_getticks);
|
|
u16 vendor;
|
|
|
|
if (priv->flags & TPM_TIS_ITPM_WORKAROUND)
|
|
return 0;
|
|
|
|
rc = tpm_tis_read16(priv, TPM_DID_VID(0), &vendor);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
/* probe only iTPMS */
|
|
if (vendor != TPM_VID_INTEL)
|
|
return 0;
|
|
|
|
rc = tpm_tis_send_data(chip, cmd_getticks, len);
|
|
if (rc == 0)
|
|
goto out;
|
|
|
|
tpm_tis_ready(chip);
|
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release_locality(chip, priv->locality, 0);
|
|
|
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priv->flags |= TPM_TIS_ITPM_WORKAROUND;
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|
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rc = tpm_tis_send_data(chip, cmd_getticks, len);
|
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if (rc == 0)
|
|
dev_info(&chip->dev, "Detected an iTPM.\n");
|
|
else {
|
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priv->flags &= ~TPM_TIS_ITPM_WORKAROUND;
|
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rc = -EFAULT;
|
|
}
|
|
|
|
out:
|
|
tpm_tis_ready(chip);
|
|
release_locality(chip, priv->locality, 0);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static bool tpm_tis_req_canceled(struct tpm_chip *chip, u8 status)
|
|
{
|
|
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
|
|
|
|
switch (priv->manufacturer_id) {
|
|
case TPM_VID_WINBOND:
|
|
return ((status == TPM_STS_VALID) ||
|
|
(status == (TPM_STS_VALID | TPM_STS_COMMAND_READY)));
|
|
case TPM_VID_STM:
|
|
return (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY));
|
|
default:
|
|
return (status == TPM_STS_COMMAND_READY);
|
|
}
|
|
}
|
|
|
|
static irqreturn_t tis_int_handler(int dummy, void *dev_id)
|
|
{
|
|
struct tpm_chip *chip = dev_id;
|
|
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
|
|
u32 interrupt;
|
|
int i, rc;
|
|
|
|
rc = tpm_tis_read32(priv, TPM_INT_STATUS(priv->locality), &interrupt);
|
|
if (rc < 0)
|
|
return IRQ_NONE;
|
|
|
|
if (interrupt == 0)
|
|
return IRQ_NONE;
|
|
|
|
priv->irq_tested = true;
|
|
if (interrupt & TPM_INTF_DATA_AVAIL_INT)
|
|
wake_up_interruptible(&priv->read_queue);
|
|
if (interrupt & TPM_INTF_LOCALITY_CHANGE_INT)
|
|
for (i = 0; i < 5; i++)
|
|
if (check_locality(chip, i) >= 0)
|
|
break;
|
|
if (interrupt &
|
|
(TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_STS_VALID_INT |
|
|
TPM_INTF_CMD_READY_INT))
|
|
wake_up_interruptible(&priv->int_queue);
|
|
|
|
/* Clear interrupts handled with TPM_EOI */
|
|
rc = tpm_tis_write32(priv, TPM_INT_STATUS(priv->locality), interrupt);
|
|
if (rc < 0)
|
|
return IRQ_NONE;
|
|
|
|
tpm_tis_read32(priv, TPM_INT_STATUS(priv->locality), &interrupt);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int tpm_tis_gen_interrupt(struct tpm_chip *chip)
|
|
{
|
|
const char *desc = "attempting to generate an interrupt";
|
|
u32 cap2;
|
|
cap_t cap;
|
|
|
|
if (chip->flags & TPM_CHIP_FLAG_TPM2)
|
|
return tpm2_get_tpm_pt(chip, 0x100, &cap2, desc);
|
|
else
|
|
return tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc,
|
|
0);
|
|
}
|
|
|
|
/* Register the IRQ and issue a command that will cause an interrupt. If an
|
|
* irq is seen then leave the chip setup for IRQ operation, otherwise reverse
|
|
* everything and leave in polling mode. Returns 0 on success.
|
|
*/
|
|
static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask,
|
|
int flags, int irq)
|
|
{
|
|
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
|
|
u8 original_int_vec;
|
|
int rc;
|
|
u32 int_status;
|
|
|
|
if (devm_request_irq(chip->dev.parent, irq, tis_int_handler, flags,
|
|
dev_name(&chip->dev), chip) != 0) {
|
|
dev_info(&chip->dev, "Unable to request irq: %d for probe\n",
|
|
irq);
|
|
return -1;
|
|
}
|
|
priv->irq = irq;
|
|
|
|
rc = tpm_tis_read8(priv, TPM_INT_VECTOR(priv->locality),
|
|
&original_int_vec);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
rc = tpm_tis_write8(priv, TPM_INT_VECTOR(priv->locality), irq);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
rc = tpm_tis_read32(priv, TPM_INT_STATUS(priv->locality), &int_status);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
/* Clear all existing */
|
|
rc = tpm_tis_write32(priv, TPM_INT_STATUS(priv->locality), int_status);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
/* Turn on */
|
|
rc = tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality),
|
|
intmask | TPM_GLOBAL_INT_ENABLE);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
priv->irq_tested = false;
|
|
|
|
/* Generate an interrupt by having the core call through to
|
|
* tpm_tis_send
|
|
*/
|
|
rc = tpm_tis_gen_interrupt(chip);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
/* tpm_tis_send will either confirm the interrupt is working or it
|
|
* will call disable_irq which undoes all of the above.
|
|
*/
|
|
if (!(chip->flags & TPM_CHIP_FLAG_IRQ)) {
|
|
rc = tpm_tis_write8(priv, original_int_vec,
|
|
TPM_INT_VECTOR(priv->locality));
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Try to find the IRQ the TPM is using. This is for legacy x86 systems that
|
|
* do not have ACPI/etc. We typically expect the interrupt to be declared if
|
|
* present.
|
|
*/
|
|
static void tpm_tis_probe_irq(struct tpm_chip *chip, u32 intmask)
|
|
{
|
|
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
|
|
u8 original_int_vec;
|
|
int i, rc;
|
|
|
|
rc = tpm_tis_read8(priv, TPM_INT_VECTOR(priv->locality),
|
|
&original_int_vec);
|
|
if (rc < 0)
|
|
return;
|
|
|
|
if (!original_int_vec) {
|
|
if (IS_ENABLED(CONFIG_X86))
|
|
for (i = 3; i <= 15; i++)
|
|
if (!tpm_tis_probe_irq_single(chip, intmask, 0,
|
|
i))
|
|
return;
|
|
} else if (!tpm_tis_probe_irq_single(chip, intmask, 0,
|
|
original_int_vec))
|
|
return;
|
|
}
|
|
|
|
void tpm_tis_remove(struct tpm_chip *chip)
|
|
{
|
|
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
|
|
u32 reg = TPM_INT_ENABLE(priv->locality);
|
|
u32 interrupt;
|
|
int rc;
|
|
|
|
rc = tpm_tis_read32(priv, reg, &interrupt);
|
|
if (rc < 0)
|
|
interrupt = 0;
|
|
|
|
tpm_tis_write32(priv, reg, ~TPM_GLOBAL_INT_ENABLE & interrupt);
|
|
release_locality(chip, priv->locality, 1);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_tis_remove);
|
|
|
|
static const struct tpm_class_ops tpm_tis = {
|
|
.flags = TPM_OPS_AUTO_STARTUP,
|
|
.status = tpm_tis_status,
|
|
.recv = tpm_tis_recv,
|
|
.send = tpm_tis_send,
|
|
.cancel = tpm_tis_ready,
|
|
.update_timeouts = tpm_tis_update_timeouts,
|
|
.req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
|
|
.req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
|
|
.req_canceled = tpm_tis_req_canceled,
|
|
};
|
|
|
|
int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
|
|
const struct tpm_tis_phy_ops *phy_ops,
|
|
acpi_handle acpi_dev_handle)
|
|
{
|
|
u32 vendor, intfcaps, intmask;
|
|
u8 rid;
|
|
int rc, probe;
|
|
struct tpm_chip *chip;
|
|
|
|
chip = tpmm_chip_alloc(dev, &tpm_tis);
|
|
if (IS_ERR(chip))
|
|
return PTR_ERR(chip);
|
|
|
|
#ifdef CONFIG_ACPI
|
|
chip->acpi_dev_handle = acpi_dev_handle;
|
|
#endif
|
|
|
|
/* Maximum timeouts */
|
|
chip->timeout_a = msecs_to_jiffies(TIS_TIMEOUT_A_MAX);
|
|
chip->timeout_b = msecs_to_jiffies(TIS_TIMEOUT_B_MAX);
|
|
chip->timeout_c = msecs_to_jiffies(TIS_TIMEOUT_C_MAX);
|
|
chip->timeout_d = msecs_to_jiffies(TIS_TIMEOUT_D_MAX);
|
|
priv->phy_ops = phy_ops;
|
|
dev_set_drvdata(&chip->dev, priv);
|
|
|
|
if (wait_startup(chip, 0) != 0) {
|
|
rc = -ENODEV;
|
|
goto out_err;
|
|
}
|
|
|
|
/* Take control of the TPM's interrupt hardware and shut it off */
|
|
rc = tpm_tis_read32(priv, TPM_INT_ENABLE(priv->locality), &intmask);
|
|
if (rc < 0)
|
|
goto out_err;
|
|
|
|
intmask |= TPM_INTF_CMD_READY_INT | TPM_INTF_LOCALITY_CHANGE_INT |
|
|
TPM_INTF_DATA_AVAIL_INT | TPM_INTF_STS_VALID_INT;
|
|
intmask &= ~TPM_GLOBAL_INT_ENABLE;
|
|
tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask);
|
|
|
|
if (request_locality(chip, 0) != 0) {
|
|
rc = -ENODEV;
|
|
goto out_err;
|
|
}
|
|
|
|
rc = tpm2_probe(chip);
|
|
if (rc)
|
|
goto out_err;
|
|
|
|
rc = tpm_tis_read32(priv, TPM_DID_VID(0), &vendor);
|
|
if (rc < 0)
|
|
goto out_err;
|
|
|
|
priv->manufacturer_id = vendor;
|
|
|
|
rc = tpm_tis_read8(priv, TPM_RID(0), &rid);
|
|
if (rc < 0)
|
|
goto out_err;
|
|
|
|
dev_info(dev, "%s TPM (device-id 0x%X, rev-id %d)\n",
|
|
(chip->flags & TPM_CHIP_FLAG_TPM2) ? "2.0" : "1.2",
|
|
vendor >> 16, rid);
|
|
|
|
probe = probe_itpm(chip);
|
|
if (probe < 0) {
|
|
rc = -ENODEV;
|
|
goto out_err;
|
|
}
|
|
|
|
/* Figure out the capabilities */
|
|
rc = tpm_tis_read32(priv, TPM_INTF_CAPS(priv->locality), &intfcaps);
|
|
if (rc < 0)
|
|
goto out_err;
|
|
|
|
dev_dbg(dev, "TPM interface capabilities (0x%x):\n",
|
|
intfcaps);
|
|
if (intfcaps & TPM_INTF_BURST_COUNT_STATIC)
|
|
dev_dbg(dev, "\tBurst Count Static\n");
|
|
if (intfcaps & TPM_INTF_CMD_READY_INT)
|
|
dev_dbg(dev, "\tCommand Ready Int Support\n");
|
|
if (intfcaps & TPM_INTF_INT_EDGE_FALLING)
|
|
dev_dbg(dev, "\tInterrupt Edge Falling\n");
|
|
if (intfcaps & TPM_INTF_INT_EDGE_RISING)
|
|
dev_dbg(dev, "\tInterrupt Edge Rising\n");
|
|
if (intfcaps & TPM_INTF_INT_LEVEL_LOW)
|
|
dev_dbg(dev, "\tInterrupt Level Low\n");
|
|
if (intfcaps & TPM_INTF_INT_LEVEL_HIGH)
|
|
dev_dbg(dev, "\tInterrupt Level High\n");
|
|
if (intfcaps & TPM_INTF_LOCALITY_CHANGE_INT)
|
|
dev_dbg(dev, "\tLocality Change Int Support\n");
|
|
if (intfcaps & TPM_INTF_STS_VALID_INT)
|
|
dev_dbg(dev, "\tSts Valid Int Support\n");
|
|
if (intfcaps & TPM_INTF_DATA_AVAIL_INT)
|
|
dev_dbg(dev, "\tData Avail Int Support\n");
|
|
|
|
/* INTERRUPT Setup */
|
|
init_waitqueue_head(&priv->read_queue);
|
|
init_waitqueue_head(&priv->int_queue);
|
|
if (irq != -1) {
|
|
/* Before doing irq testing issue a command to the TPM in polling mode
|
|
* to make sure it works. May as well use that command to set the
|
|
* proper timeouts for the driver.
|
|
*/
|
|
if (tpm_get_timeouts(chip)) {
|
|
dev_err(dev, "Could not get TPM timeouts and durations\n");
|
|
rc = -ENODEV;
|
|
goto out_err;
|
|
}
|
|
|
|
if (irq) {
|
|
tpm_tis_probe_irq_single(chip, intmask, IRQF_SHARED,
|
|
irq);
|
|
if (!(chip->flags & TPM_CHIP_FLAG_IRQ))
|
|
dev_err(&chip->dev, FW_BUG
|
|
"TPM interrupt not working, polling instead\n");
|
|
} else {
|
|
tpm_tis_probe_irq(chip, intmask);
|
|
}
|
|
}
|
|
|
|
return tpm_chip_register(chip);
|
|
out_err:
|
|
tpm_tis_remove(chip);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_tis_core_init);
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static void tpm_tis_reenable_interrupts(struct tpm_chip *chip)
|
|
{
|
|
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
|
|
u32 intmask;
|
|
int rc;
|
|
|
|
/* reenable interrupts that device may have lost or
|
|
* BIOS/firmware may have disabled
|
|
*/
|
|
rc = tpm_tis_write8(priv, TPM_INT_VECTOR(priv->locality), priv->irq);
|
|
if (rc < 0)
|
|
return;
|
|
|
|
rc = tpm_tis_read32(priv, TPM_INT_ENABLE(priv->locality), &intmask);
|
|
if (rc < 0)
|
|
return;
|
|
|
|
intmask |= TPM_INTF_CMD_READY_INT
|
|
| TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT
|
|
| TPM_INTF_STS_VALID_INT | TPM_GLOBAL_INT_ENABLE;
|
|
|
|
tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask);
|
|
}
|
|
|
|
int tpm_tis_resume(struct device *dev)
|
|
{
|
|
struct tpm_chip *chip = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
if (chip->flags & TPM_CHIP_FLAG_IRQ)
|
|
tpm_tis_reenable_interrupts(chip);
|
|
|
|
ret = tpm_pm_resume(dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* TPM 1.2 requires self-test on resume. This function actually returns
|
|
* an error code but for unknown reason it isn't handled.
|
|
*/
|
|
if (!(chip->flags & TPM_CHIP_FLAG_TPM2))
|
|
tpm_do_selftest(chip);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm_tis_resume);
|
|
#endif
|
|
|
|
MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
|
|
MODULE_DESCRIPTION("TPM Driver");
|
|
MODULE_VERSION("2.0");
|
|
MODULE_LICENSE("GPL");
|