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kernel/drivers/char/tpm/tpm_tis_core.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2005, 2006 IBM Corporation
* Copyright (C) 2014, 2015 Intel Corporation
*
* Authors:
* Leendert van Doorn <leendert@watson.ibm.com>
* Kylene Hall <kjhall@us.ibm.com>
*
* Maintained by: <tpmdd-devel@lists.sourceforge.net>
*
* Device driver for TCG/TCPA TPM (trusted platform module).
* Specifications at www.trustedcomputinggroup.org
*
* This device driver implements the TPM interface as defined in
* the TCG TPM Interface Spec version 1.2, revision 1.0.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/pnp.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/wait.h>
#include <linux/acpi.h>
#include <linux/freezer.h>
#include "tpm.h"
#include "tpm_tis_core.h"
static void tpm_tis_clkrun_enable(struct tpm_chip *chip, bool value);
static bool wait_for_tpm_stat_cond(struct tpm_chip *chip, u8 mask,
bool check_cancel, bool *canceled)
{
u8 status = chip->ops->status(chip);
*canceled = false;
if ((status & mask) == mask)
return true;
if (check_cancel && chip->ops->req_canceled(chip, status)) {
*canceled = true;
return true;
}
return false;
}
static int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask,
unsigned long timeout, wait_queue_head_t *queue,
bool check_cancel)
{
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
unsigned long stop;
long rc;
u8 status;
bool canceled = false;
/* check current status */
status = chip->ops->status(chip);
if ((status & mask) == mask)
return 0;
stop = jiffies + timeout;
if (chip->flags & TPM_CHIP_FLAG_IRQ) {
again:
timeout = stop - jiffies;
if ((long)timeout <= 0)
return -ETIME;
rc = wait_event_interruptible_timeout(*queue,
wait_for_tpm_stat_cond(chip, mask, check_cancel,
&canceled),
timeout);
if (rc > 0) {
if (canceled)
return -ECANCELED;
return 0;
}
if (rc == -ERESTARTSYS && freezing(current)) {
clear_thread_flag(TIF_SIGPENDING);
goto again;
}
} else {
do {
usleep_range(priv->timeout_min,
priv->timeout_max);
status = chip->ops->status(chip);
if ((status & mask) == mask)
return 0;
} while (time_before(jiffies, stop));
}
return -ETIME;
}
/* Before we attempt to access the TPM we must see that the valid bit is set.
* The specification says that this bit is 0 at reset and remains 0 until the
* 'TPM has gone through its self test and initialization and has established
* correct values in the other bits.'
*/
static int wait_startup(struct tpm_chip *chip, int l)
{
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
unsigned long stop = jiffies + chip->timeout_a;
do {
int rc;
u8 access;
rc = tpm_tis_read8(priv, TPM_ACCESS(l), &access);
if (rc < 0)
return rc;
if (access & TPM_ACCESS_VALID)
return 0;
tpm_msleep(TPM_TIMEOUT);
} while (time_before(jiffies, stop));
return -1;
}
static bool check_locality(struct tpm_chip *chip, int l)
{
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
int rc;
u8 access;
rc = tpm_tis_read8(priv, TPM_ACCESS(l), &access);
if (rc < 0)
return false;
if ((access & (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID
| TPM_ACCESS_REQUEST_USE)) ==
(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) {
priv->locality = l;
return true;
}
return false;
}
static int release_locality(struct tpm_chip *chip, int l)
{
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
tpm_tis_write8(priv, TPM_ACCESS(l), TPM_ACCESS_ACTIVE_LOCALITY);
return 0;
}
static int request_locality(struct tpm_chip *chip, int l)
{
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
unsigned long stop, timeout;
long rc;
if (check_locality(chip, l))
return l;
rc = tpm_tis_write8(priv, TPM_ACCESS(l), TPM_ACCESS_REQUEST_USE);
if (rc < 0)
return rc;
stop = jiffies + chip->timeout_a;
if (chip->flags & TPM_CHIP_FLAG_IRQ) {
again:
timeout = stop - jiffies;
if ((long)timeout <= 0)
return -1;
rc = wait_event_interruptible_timeout(priv->int_queue,
(check_locality
(chip, l)),
timeout);
if (rc > 0)
return l;
if (rc == -ERESTARTSYS && freezing(current)) {
clear_thread_flag(TIF_SIGPENDING);
goto again;
}
} else {
/* wait for burstcount */
do {
if (check_locality(chip, l))
return l;
tpm_msleep(TPM_TIMEOUT);
} while (time_before(jiffies, stop));
}
return -1;
}
static u8 tpm_tis_status(struct tpm_chip *chip)
{
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
int rc;
u8 status;
rc = tpm_tis_read8(priv, TPM_STS(priv->locality), &status);
if (rc < 0)
return 0;
if (unlikely((status & TPM_STS_READ_ZERO) != 0)) {
if (!test_and_set_bit(TPM_TIS_INVALID_STATUS, &priv->flags)) {
/*
* If this trips, the chances are the read is
* returning 0xff because the locality hasn't been
* acquired. Usually because tpm_try_get_ops() hasn't
* been called before doing a TPM operation.
*/
dev_err(&chip->dev, "invalid TPM_STS.x 0x%02x, dumping stack for forensics\n",
status);
/*
* Dump stack for forensics, as invalid TPM_STS.x could be
* potentially triggered by impaired tpm_try_get_ops() or
* tpm_find_get_ops().
*/
dump_stack();
}
return 0;
}
return status;
}
static void tpm_tis_ready(struct tpm_chip *chip)
{
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
/* this causes the current command to be aborted */
tpm_tis_write8(priv, TPM_STS(priv->locality), TPM_STS_COMMAND_READY);
}
static int get_burstcount(struct tpm_chip *chip)
{
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
unsigned long stop;
int burstcnt, rc;
u32 value;
/* wait for burstcount */
if (chip->flags & TPM_CHIP_FLAG_TPM2)
stop = jiffies + chip->timeout_a;
else
stop = jiffies + chip->timeout_d;
do {
rc = tpm_tis_read32(priv, TPM_STS(priv->locality), &value);
if (rc < 0)
return rc;
burstcnt = (value >> 8) & 0xFFFF;
if (burstcnt)
return burstcnt;
usleep_range(TPM_TIMEOUT_USECS_MIN, TPM_TIMEOUT_USECS_MAX);
} while (time_before(jiffies, stop));
return -EBUSY;
}
static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
{
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
int size = 0, burstcnt, rc;
while (size < count) {
rc = wait_for_tpm_stat(chip,
TPM_STS_DATA_AVAIL | TPM_STS_VALID,
chip->timeout_c,
&priv->read_queue, true);
if (rc < 0)
return rc;
burstcnt = get_burstcount(chip);
if (burstcnt < 0) {
dev_err(&chip->dev, "Unable to read burstcount\n");
return burstcnt;
}
burstcnt = min_t(int, burstcnt, count - size);
rc = tpm_tis_read_bytes(priv, TPM_DATA_FIFO(priv->locality),
burstcnt, buf + size);
if (rc < 0)
return rc;
size += burstcnt;
}
return size;
}
static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count)
{
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
int size = 0;
int status;
u32 expected;
if (count < TPM_HEADER_SIZE) {
size = -EIO;
goto out;
}
size = recv_data(chip, buf, TPM_HEADER_SIZE);
/* read first 10 bytes, including tag, paramsize, and result */
if (size < TPM_HEADER_SIZE) {
dev_err(&chip->dev, "Unable to read header\n");
goto out;
}
expected = be32_to_cpu(*(__be32 *) (buf + 2));
if (expected > count || expected < TPM_HEADER_SIZE) {
size = -EIO;
goto out;
}
size += recv_data(chip, &buf[TPM_HEADER_SIZE],
expected - TPM_HEADER_SIZE);
if (size < expected) {
dev_err(&chip->dev, "Unable to read remainder of result\n");
size = -ETIME;
goto out;
}
if (wait_for_tpm_stat(chip, TPM_STS_VALID, chip->timeout_c,
&priv->int_queue, false) < 0) {
size = -ETIME;
goto out;
}
status = tpm_tis_status(chip);
if (status & TPM_STS_DATA_AVAIL) { /* retry? */
dev_err(&chip->dev, "Error left over data\n");
size = -EIO;
goto out;
}
out:
tpm_tis_ready(chip);
return size;
}
/*
* If interrupts are used (signaled by an irq set in the vendor structure)
* tpm.c can skip polling for the data to be available as the interrupt is
* waited for here
*/
static int tpm_tis_send_data(struct tpm_chip *chip, const u8 *buf, size_t len)
{
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
int rc, status, burstcnt;
size_t count = 0;
bool itpm = priv->flags & TPM_TIS_ITPM_WORKAROUND;
status = tpm_tis_status(chip);
if ((status & TPM_STS_COMMAND_READY) == 0) {
tpm_tis_ready(chip);
if (wait_for_tpm_stat
(chip, TPM_STS_COMMAND_READY, chip->timeout_b,
&priv->int_queue, false) < 0) {
rc = -ETIME;
goto out_err;
}
}
while (count < len - 1) {
burstcnt = get_burstcount(chip);
if (burstcnt < 0) {
dev_err(&chip->dev, "Unable to read burstcount\n");
rc = burstcnt;
goto out_err;
}
burstcnt = min_t(int, burstcnt, len - count - 1);
rc = tpm_tis_write_bytes(priv, TPM_DATA_FIFO(priv->locality),
burstcnt, buf + count);
if (rc < 0)
goto out_err;
count += burstcnt;
if (wait_for_tpm_stat(chip, TPM_STS_VALID, chip->timeout_c,
&priv->int_queue, false) < 0) {
rc = -ETIME;
goto out_err;
}
status = tpm_tis_status(chip);
if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) {
rc = -EIO;
goto out_err;
}
}
/* write last byte */
rc = tpm_tis_write8(priv, TPM_DATA_FIFO(priv->locality), buf[count]);
if (rc < 0)
goto out_err;
if (wait_for_tpm_stat(chip, TPM_STS_VALID, chip->timeout_c,
&priv->int_queue, false) < 0) {
rc = -ETIME;
goto out_err;
}
status = tpm_tis_status(chip);
if (!itpm && (status & TPM_STS_DATA_EXPECT) != 0) {
rc = -EIO;
goto out_err;
}
return 0;
out_err:
tpm_tis_ready(chip);
return rc;
}
static void disable_interrupts(struct tpm_chip *chip)
{
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
u32 intmask;
int rc;
if (priv->irq == 0)
return;
rc = tpm_tis_read32(priv, TPM_INT_ENABLE(priv->locality), &intmask);
if (rc < 0)
intmask = 0;
intmask &= ~TPM_GLOBAL_INT_ENABLE;
rc = tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask);
devm_free_irq(chip->dev.parent, priv->irq, chip);
priv->irq = 0;
chip->flags &= ~TPM_CHIP_FLAG_IRQ;
}
/*
* If interrupts are used (signaled by an irq set in the vendor structure)
* tpm.c can skip polling for the data to be available as the interrupt is
* waited for here
*/
static int tpm_tis_send_main(struct tpm_chip *chip, const u8 *buf, size_t len)
{
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
int rc;
u32 ordinal;
unsigned long dur;
rc = tpm_tis_send_data(chip, buf, len);
if (rc < 0)
return rc;
/* go and do it */
rc = tpm_tis_write8(priv, TPM_STS(priv->locality), TPM_STS_GO);
if (rc < 0)
goto out_err;
if (chip->flags & TPM_CHIP_FLAG_IRQ) {
ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
dur = tpm_calc_ordinal_duration(chip, ordinal);
if (wait_for_tpm_stat
(chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID, dur,
&priv->read_queue, false) < 0) {
rc = -ETIME;
goto out_err;
}
}
return 0;
out_err:
tpm_tis_ready(chip);
return rc;
}
static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
{
int rc, irq;
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
if (!(chip->flags & TPM_CHIP_FLAG_IRQ) || priv->irq_tested)
return tpm_tis_send_main(chip, buf, len);
/* Verify receipt of the expected IRQ */
irq = priv->irq;
priv->irq = 0;
chip->flags &= ~TPM_CHIP_FLAG_IRQ;
rc = tpm_tis_send_main(chip, buf, len);
priv->irq = irq;
chip->flags |= TPM_CHIP_FLAG_IRQ;
if (!priv->irq_tested)
tpm_msleep(1);
if (!priv->irq_tested)
disable_interrupts(chip);
priv->irq_tested = true;
return rc;
}
struct tis_vendor_durations_override {
u32 did_vid;
struct tpm1_version version;
unsigned long durations[3];
};
static const struct tis_vendor_durations_override vendor_dur_overrides[] = {
/* STMicroelectronics 0x104a */
{ 0x0000104a,
{ 1, 2, 8, 28 },
{ (2 * 60 * HZ), (2 * 60 * HZ), (2 * 60 * HZ) } },
};
static void tpm_tis_update_durations(struct tpm_chip *chip,
unsigned long *duration_cap)
{
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
struct tpm1_version *version;
u32 did_vid;
int i, rc;
cap_t cap;
chip->duration_adjusted = false;
if (chip->ops->clk_enable != NULL)
chip->ops->clk_enable(chip, true);
rc = tpm_tis_read32(priv, TPM_DID_VID(0), &did_vid);
if (rc < 0) {
dev_warn(&chip->dev, "%s: failed to read did_vid. %d\n",
__func__, rc);
goto out;
}
/* Try to get a TPM version 1.2 or 1.1 TPM_CAP_VERSION_INFO */
rc = tpm1_getcap(chip, TPM_CAP_VERSION_1_2, &cap,
"attempting to determine the 1.2 version",
sizeof(cap.version2));
if (!rc) {
version = &cap.version2.version;
} else {
rc = tpm1_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
"attempting to determine the 1.1 version",
sizeof(cap.version1));
if (rc)
goto out;
version = &cap.version1;
}
for (i = 0; i != ARRAY_SIZE(vendor_dur_overrides); i++) {
if (vendor_dur_overrides[i].did_vid != did_vid)
continue;
if ((version->major ==
vendor_dur_overrides[i].version.major) &&
(version->minor ==
vendor_dur_overrides[i].version.minor) &&
(version->rev_major ==
vendor_dur_overrides[i].version.rev_major) &&
(version->rev_minor ==
vendor_dur_overrides[i].version.rev_minor)) {
memcpy(duration_cap,
vendor_dur_overrides[i].durations,
sizeof(vendor_dur_overrides[i].durations));
chip->duration_adjusted = true;
goto out;
}
}
out:
if (chip->ops->clk_enable != NULL)
chip->ops->clk_enable(chip, false);
}
struct tis_vendor_timeout_override {
u32 did_vid;
unsigned long timeout_us[4];
};
static const struct tis_vendor_timeout_override vendor_timeout_overrides[] = {
/* Atmel 3204 */
{ 0x32041114, { (TIS_SHORT_TIMEOUT*1000), (TIS_LONG_TIMEOUT*1000),
(TIS_SHORT_TIMEOUT*1000), (TIS_SHORT_TIMEOUT*1000) } },
};
static void tpm_tis_update_timeouts(struct tpm_chip *chip,
unsigned long *timeout_cap)
{
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
int i, rc;
u32 did_vid;
chip->timeout_adjusted = false;
if (chip->ops->clk_enable != NULL)
chip->ops->clk_enable(chip, true);
rc = tpm_tis_read32(priv, TPM_DID_VID(0), &did_vid);
if (rc < 0) {
dev_warn(&chip->dev, "%s: failed to read did_vid: %d\n",
__func__, rc);
goto out;
}
for (i = 0; i != ARRAY_SIZE(vendor_timeout_overrides); i++) {
if (vendor_timeout_overrides[i].did_vid != did_vid)
continue;
memcpy(timeout_cap, vendor_timeout_overrides[i].timeout_us,
sizeof(vendor_timeout_overrides[i].timeout_us));
chip->timeout_adjusted = true;
}
out:
if (chip->ops->clk_enable != NULL)
chip->ops->clk_enable(chip, false);
return;
}
/*
* 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);
int rc = 0;
static const u8 cmd_getticks[] = {
0x00, 0xc1, 0x00, 0x00, 0x00, 0x0a,
0x00, 0x00, 0x00, 0xf1
};
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;
if (request_locality(chip, 0) != 0)
return -EBUSY;
rc = tpm_tis_send_data(chip, cmd_getticks, len);
if (rc == 0)
goto out;
tpm_tis_ready(chip);
priv->flags |= TPM_TIS_ITPM_WORKAROUND;
rc = tpm_tis_send_data(chip, cmd_getticks, len);
if (rc == 0)
dev_info(&chip->dev, "Detected an iTPM.\n");
else {
priv->flags &= ~TPM_TIS_ITPM_WORKAROUND;
rc = -EFAULT;
}
out:
tpm_tis_ready(chip);
release_locality(chip, priv->locality);
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))
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;
int ret;
ret = request_locality(chip, 0);
if (ret < 0)
return ret;
if (chip->flags & TPM_CHIP_FLAG_TPM2)
ret = tpm2_get_tpm_pt(chip, 0x100, &cap2, desc);
else
ret = tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, desc, 0);
release_locality(chip, 0);
return ret;
}
/* 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;
tpm_tis_clkrun_enable(chip, true);
rc = tpm_tis_read32(priv, reg, &interrupt);
if (rc < 0)
interrupt = 0;
tpm_tis_write32(priv, reg, ~TPM_GLOBAL_INT_ENABLE & interrupt);
tpm_tis_clkrun_enable(chip, false);
if (priv->ilb_base_addr)
iounmap(priv->ilb_base_addr);
}
EXPORT_SYMBOL_GPL(tpm_tis_remove);
/**
* tpm_tis_clkrun_enable() - Keep clkrun protocol disabled for entire duration
* of a single TPM command
* @chip: TPM chip to use
* @value: 1 - Disable CLKRUN protocol, so that clocks are free running
* 0 - Enable CLKRUN protocol
* Call this function directly in tpm_tis_remove() in error or driver removal
* path, since the chip->ops is set to NULL in tpm_chip_unregister().
*/
static void tpm_tis_clkrun_enable(struct tpm_chip *chip, bool value)
{
struct tpm_tis_data *data = dev_get_drvdata(&chip->dev);
u32 clkrun_val;
if (!IS_ENABLED(CONFIG_X86) || !is_bsw() ||
!data->ilb_base_addr)
return;
if (value) {
data->clkrun_enabled++;
if (data->clkrun_enabled > 1)
return;
clkrun_val = ioread32(data->ilb_base_addr + LPC_CNTRL_OFFSET);
/* Disable LPC CLKRUN# */
clkrun_val &= ~LPC_CLKRUN_EN;
iowrite32(clkrun_val, data->ilb_base_addr + LPC_CNTRL_OFFSET);
/*
* Write any random value on port 0x80 which is on LPC, to make
* sure LPC clock is running before sending any TPM command.
*/
outb(0xCC, 0x80);
} else {
data->clkrun_enabled--;
if (data->clkrun_enabled)
return;
clkrun_val = ioread32(data->ilb_base_addr + LPC_CNTRL_OFFSET);
/* Enable LPC CLKRUN# */
clkrun_val |= LPC_CLKRUN_EN;
iowrite32(clkrun_val, data->ilb_base_addr + LPC_CNTRL_OFFSET);
/*
* Write any random value on port 0x80 which is on LPC, to make
* sure LPC clock is running before sending any TPM command.
*/
outb(0xCC, 0x80);
}
}
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,
.update_durations = tpm_tis_update_durations,
.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,
.request_locality = request_locality,
.relinquish_locality = release_locality,
.clk_enable = tpm_tis_clkrun_enable,
};
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;
u32 intfcaps;
u32 intmask;
u32 clkrun_val;
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
chip->hwrng.quality = priv->rng_quality;
/* 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->timeout_min = TPM_TIMEOUT_USECS_MIN;
priv->timeout_max = TPM_TIMEOUT_USECS_MAX;
priv->phy_ops = phy_ops;
dev_set_drvdata(&chip->dev, priv);
rc = tpm_tis_read32(priv, TPM_DID_VID(0), &vendor);
if (rc < 0)
return rc;
priv->manufacturer_id = vendor;
if (priv->manufacturer_id == TPM_VID_ATML &&
!(chip->flags & TPM_CHIP_FLAG_TPM2)) {
priv->timeout_min = TIS_TIMEOUT_MIN_ATML;
priv->timeout_max = TIS_TIMEOUT_MAX_ATML;
}
if (is_bsw()) {
priv->ilb_base_addr = ioremap(INTEL_LEGACY_BLK_BASE_ADDR,
ILB_REMAP_SIZE);
if (!priv->ilb_base_addr)
return -ENOMEM;
clkrun_val = ioread32(priv->ilb_base_addr + LPC_CNTRL_OFFSET);
/* Check if CLKRUN# is already not enabled in the LPC bus */
if (!(clkrun_val & LPC_CLKRUN_EN)) {
iounmap(priv->ilb_base_addr);
priv->ilb_base_addr = NULL;
}
}
if (chip->ops->clk_enable != NULL)
chip->ops->clk_enable(chip, true);
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;
rc = request_locality(chip, 0);
if (rc < 0) {
rc = -ENODEV;
goto out_err;
}
tpm_tis_write32(priv, TPM_INT_ENABLE(priv->locality), intmask);
release_locality(chip, 0);
rc = tpm_chip_start(chip);
if (rc)
goto out_err;
rc = tpm2_probe(chip);
tpm_chip_stop(chip);
if (rc)
goto out_err;
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);
rc = tpm_chip_bootstrap(chip);
if (rc)
goto out_err;
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.
*/
rc = request_locality(chip, 0);
if (rc < 0)
goto out_err;
rc = tpm_get_timeouts(chip);
release_locality(chip, 0);
if (rc) {
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");
disable_interrupts(chip);
}
} else {
tpm_tis_probe_irq(chip, intmask);
}
}
rc = tpm_chip_register(chip);
if (rc)
goto out_err;
if (chip->ops->clk_enable != NULL)
chip->ops->clk_enable(chip, false);
return 0;
out_err:
if (chip->ops->clk_enable != NULL)
chip->ops->clk_enable(chip, false);
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;
if (chip->ops->clk_enable != NULL)
chip->ops->clk_enable(chip, true);
/* 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)
goto out;
rc = tpm_tis_read32(priv, TPM_INT_ENABLE(priv->locality), &intmask);
if (rc < 0)
goto out;
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);
out:
if (chip->ops->clk_enable != NULL)
chip->ops->clk_enable(chip, false);
return;
}
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)) {
ret = request_locality(chip, 0);
if (ret < 0)
return ret;
tpm1_do_selftest(chip);
release_locality(chip, 0);
}
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");
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