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linux/drivers/char/tpm/tpm_tis.c

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/*
* 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.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, version 2 of the
* License.
*/
#include <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"
enum tis_access {
TPM_ACCESS_VALID = 0x80,
TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
TPM_ACCESS_REQUEST_PENDING = 0x04,
TPM_ACCESS_REQUEST_USE = 0x02,
};
enum tis_status {
TPM_STS_VALID = 0x80,
TPM_STS_COMMAND_READY = 0x40,
TPM_STS_GO = 0x20,
TPM_STS_DATA_AVAIL = 0x10,
TPM_STS_DATA_EXPECT = 0x08,
};
enum tis_int_flags {
TPM_GLOBAL_INT_ENABLE = 0x80000000,
TPM_INTF_BURST_COUNT_STATIC = 0x100,
TPM_INTF_CMD_READY_INT = 0x080,
TPM_INTF_INT_EDGE_FALLING = 0x040,
TPM_INTF_INT_EDGE_RISING = 0x020,
TPM_INTF_INT_LEVEL_LOW = 0x010,
TPM_INTF_INT_LEVEL_HIGH = 0x008,
TPM_INTF_LOCALITY_CHANGE_INT = 0x004,
TPM_INTF_STS_VALID_INT = 0x002,
TPM_INTF_DATA_AVAIL_INT = 0x001,
};
enum tis_defaults {
TIS_MEM_LEN = 0x5000,
TIS_SHORT_TIMEOUT = 750, /* ms */
TIS_LONG_TIMEOUT = 2000, /* 2 sec */
};
struct tpm_info {
struct resource res;
/* irq > 0 means: use irq $irq;
* irq = 0 means: autoprobe for an irq;
* irq = -1 means: no irq support
*/
int irq;
};
/* Some timeout values are needed before it is known whether the chip is
* TPM 1.0 or TPM 2.0.
*/
#define TIS_TIMEOUT_A_MAX max(TIS_SHORT_TIMEOUT, TPM2_TIMEOUT_A)
#define TIS_TIMEOUT_B_MAX max(TIS_LONG_TIMEOUT, TPM2_TIMEOUT_B)
#define TIS_TIMEOUT_C_MAX max(TIS_SHORT_TIMEOUT, TPM2_TIMEOUT_C)
#define TIS_TIMEOUT_D_MAX max(TIS_SHORT_TIMEOUT, TPM2_TIMEOUT_D)
#define TPM_ACCESS(l) (0x0000 | ((l) << 12))
#define TPM_INT_ENABLE(l) (0x0008 | ((l) << 12))
#define TPM_INT_VECTOR(l) (0x000C | ((l) << 12))
#define TPM_INT_STATUS(l) (0x0010 | ((l) << 12))
#define TPM_INTF_CAPS(l) (0x0014 | ((l) << 12))
#define TPM_STS(l) (0x0018 | ((l) << 12))
#define TPM_STS3(l) (0x001b | ((l) << 12))
#define TPM_DATA_FIFO(l) (0x0024 | ((l) << 12))
#define TPM_DID_VID(l) (0x0F00 | ((l) << 12))
#define TPM_RID(l) (0x0F04 | ((l) << 12))
struct priv_data {
bool irq_tested;
};
#if defined(CONFIG_PNP) && defined(CONFIG_ACPI)
static int has_hid(struct acpi_device *dev, const char *hid)
{
struct acpi_hardware_id *id;
list_for_each_entry(id, &dev->pnp.ids, list)
if (!strcmp(hid, id->id))
return 1;
return 0;
}
static inline int is_itpm(struct acpi_device *dev)
{
return has_hid(dev, "INTC0102");
}
#else
static inline int is_itpm(struct acpi_device *dev)
{
return 0;
}
#endif
/* 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)
{
unsigned long stop = jiffies + chip->vendor.timeout_a;
do {
if (ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
TPM_ACCESS_VALID)
return 0;
msleep(TPM_TIMEOUT);
} while (time_before(jiffies, stop));
return -1;
}
static int check_locality(struct tpm_chip *chip, int l)
{
if ((ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
return chip->vendor.locality = l;
return -1;
}
static void release_locality(struct tpm_chip *chip, int l, int force)
{
if (force || (ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
(TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) ==
(TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID))
iowrite8(TPM_ACCESS_ACTIVE_LOCALITY,
chip->vendor.iobase + TPM_ACCESS(l));
}
static int request_locality(struct tpm_chip *chip, int l)
{
unsigned long stop, timeout;
long rc;
if (check_locality(chip, l) >= 0)
return l;
iowrite8(TPM_ACCESS_REQUEST_USE,
chip->vendor.iobase + TPM_ACCESS(l));
stop = jiffies + chip->vendor.timeout_a;
if (chip->vendor.irq) {
again:
timeout = stop - jiffies;
if ((long)timeout <= 0)
return -1;
rc = wait_event_interruptible_timeout(chip->vendor.int_queue,
(check_locality
(chip, l) >= 0),
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) >= 0)
return l;
msleep(TPM_TIMEOUT);
}
while (time_before(jiffies, stop));
}
return -1;
}
static u8 tpm_tis_status(struct tpm_chip *chip)
{
return ioread8(chip->vendor.iobase +
TPM_STS(chip->vendor.locality));
}
static void tpm_tis_ready(struct tpm_chip *chip)
{
/* this causes the current command to be aborted */
iowrite8(TPM_STS_COMMAND_READY,
chip->vendor.iobase + TPM_STS(chip->vendor.locality));
}
static int get_burstcount(struct tpm_chip *chip)
{
unsigned long stop;
int burstcnt;
/* wait for burstcount */
/* which timeout value, spec has 2 answers (c & d) */
stop = jiffies + chip->vendor.timeout_d;
do {
burstcnt = ioread8(chip->vendor.iobase +
TPM_STS(chip->vendor.locality) + 1);
burstcnt += ioread8(chip->vendor.iobase +
TPM_STS(chip->vendor.locality) +
2) << 8;
if (burstcnt)
return burstcnt;
msleep(TPM_TIMEOUT);
} while (time_before(jiffies, stop));
return -EBUSY;
}
static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
{
int size = 0, burstcnt;
while (size < count &&
wait_for_tpm_stat(chip,
TPM_STS_DATA_AVAIL | TPM_STS_VALID,
chip->vendor.timeout_c,
&chip->vendor.read_queue, true)
== 0) {
burstcnt = get_burstcount(chip);
for (; burstcnt > 0 && size < count; burstcnt--)
buf[size++] = ioread8(chip->vendor.iobase +
TPM_DATA_FIFO(chip->vendor.
locality));
}
return size;
}
static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count)
{
int size = 0;
int expected, status;
if (count < TPM_HEADER_SIZE) {
size = -EIO;
goto out;
}
/* read first 10 bytes, including tag, paramsize, and result */
if ((size =
recv_data(chip, buf, TPM_HEADER_SIZE)) < TPM_HEADER_SIZE) {
dev_err(chip->pdev, "Unable to read header\n");
goto out;
}
expected = be32_to_cpu(*(__be32 *) (buf + 2));
if (expected > count) {
size = -EIO;
goto out;
}
if ((size +=
recv_data(chip, &buf[TPM_HEADER_SIZE],
expected - TPM_HEADER_SIZE)) < expected) {
dev_err(chip->pdev, "Unable to read remainder of result\n");
size = -ETIME;
goto out;
}
wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
&chip->vendor.int_queue, false);
status = tpm_tis_status(chip);
if (status & TPM_STS_DATA_AVAIL) { /* retry? */
dev_err(chip->pdev, "Error left over data\n");
size = -EIO;
goto out;
}
out:
tpm_tis_ready(chip);
release_locality(chip, chip->vendor.locality, 0);
return size;
}
static bool itpm;
module_param(itpm, bool, 0444);
MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)");
/*
* 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, u8 *buf, size_t len)
{
int rc, status, burstcnt;
size_t count = 0;
if (request_locality(chip, 0) < 0)
return -EBUSY;
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->vendor.timeout_b,
&chip->vendor.int_queue, false) < 0) {
rc = -ETIME;
goto out_err;
}
}
while (count < len - 1) {
burstcnt = get_burstcount(chip);
for (; burstcnt > 0 && count < len - 1; burstcnt--) {
iowrite8(buf[count], chip->vendor.iobase +
TPM_DATA_FIFO(chip->vendor.locality));
count++;
}
wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
&chip->vendor.int_queue, false);
status = tpm_tis_status(chip);
if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) {
rc = -EIO;
goto out_err;
}
}
/* write last byte */
iowrite8(buf[count],
chip->vendor.iobase + TPM_DATA_FIFO(chip->vendor.locality));
wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
&chip->vendor.int_queue, false);
status = tpm_tis_status(chip);
if ((status & TPM_STS_DATA_EXPECT) != 0) {
rc = -EIO;
goto out_err;
}
return 0;
out_err:
tpm_tis_ready(chip);
release_locality(chip, chip->vendor.locality, 0);
return rc;
}
static void disable_interrupts(struct tpm_chip *chip)
{
u32 intmask;
intmask =
ioread32(chip->vendor.iobase +
TPM_INT_ENABLE(chip->vendor.locality));
intmask &= ~TPM_GLOBAL_INT_ENABLE;
iowrite32(intmask,
chip->vendor.iobase +
TPM_INT_ENABLE(chip->vendor.locality));
devm_free_irq(chip->pdev, chip->vendor.irq, chip);
chip->vendor.irq = 0;
}
/*
* 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, u8 *buf, size_t len)
{
int rc;
u32 ordinal;
unsigned long dur;
rc = tpm_tis_send_data(chip, buf, len);
if (rc < 0)
return rc;
/* go and do it */
iowrite8(TPM_STS_GO,
chip->vendor.iobase + TPM_STS(chip->vendor.locality));
if (chip->vendor.irq) {
ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
if (chip->flags & TPM_CHIP_FLAG_TPM2)
dur = tpm2_calc_ordinal_duration(chip, ordinal);
else
dur = tpm_calc_ordinal_duration(chip, ordinal);
if (wait_for_tpm_stat
(chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID, dur,
&chip->vendor.read_queue, false) < 0) {
rc = -ETIME;
goto out_err;
}
}
return len;
out_err:
tpm_tis_ready(chip);
release_locality(chip, chip->vendor.locality, 0);
return rc;
}
static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
{
int rc, irq;
struct priv_data *priv = chip->vendor.priv;
if (!chip->vendor.irq || priv->irq_tested)
return tpm_tis_send_main(chip, buf, len);
/* Verify receipt of the expected IRQ */
irq = chip->vendor.irq;
chip->vendor.irq = 0;
rc = tpm_tis_send_main(chip, buf, len);
chip->vendor.irq = irq;
if (!priv->irq_tested)
msleep(1);
if (!priv->irq_tested)
disable_interrupts(chip);
priv->irq_tested = true;
return rc;
}
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 bool tpm_tis_update_timeouts(struct tpm_chip *chip,
unsigned long *timeout_cap)
{
int i;
u32 did_vid;
did_vid = ioread32(chip->vendor.iobase + TPM_DID_VID(0));
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));
return true;
}
return false;
}
/*
* 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)
{
int rc = 0;
u8 cmd_getticks[] = {
0x00, 0xc1, 0x00, 0x00, 0x00, 0x0a,
0x00, 0x00, 0x00, 0xf1
};
size_t len = sizeof(cmd_getticks);
bool rem_itpm = itpm;
u16 vendor = ioread16(chip->vendor.iobase + TPM_DID_VID(0));
/* probe only iTPMS */
if (vendor != TPM_VID_INTEL)
return 0;
itpm = false;
rc = tpm_tis_send_data(chip, cmd_getticks, len);
if (rc == 0)
goto out;
tpm_tis_ready(chip);
release_locality(chip, chip->vendor.locality, 0);
itpm = true;
rc = tpm_tis_send_data(chip, cmd_getticks, len);
if (rc == 0) {
dev_info(chip->pdev, "Detected an iTPM.\n");
rc = 1;
} else
rc = -EFAULT;
out:
itpm = rem_itpm;
tpm_tis_ready(chip);
release_locality(chip, chip->vendor.locality, 0);
return rc;
}
static bool tpm_tis_req_canceled(struct tpm_chip *chip, u8 status)
{
switch (chip->vendor.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 const struct tpm_class_ops tpm_tis = {
.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,
};
static irqreturn_t tis_int_handler(int dummy, void *dev_id)
{
struct tpm_chip *chip = dev_id;
u32 interrupt;
int i;
interrupt = ioread32(chip->vendor.iobase +
TPM_INT_STATUS(chip->vendor.locality));
if (interrupt == 0)
return IRQ_NONE;
((struct priv_data *)chip->vendor.priv)->irq_tested = true;
if (interrupt & TPM_INTF_DATA_AVAIL_INT)
wake_up_interruptible(&chip->vendor.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(&chip->vendor.int_queue);
/* Clear interrupts handled with TPM_EOI */
iowrite32(interrupt,
chip->vendor.iobase +
TPM_INT_STATUS(chip->vendor.locality));
ioread32(chip->vendor.iobase + TPM_INT_STATUS(chip->vendor.locality));
return IRQ_HANDLED;
}
/* 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 priv_data *priv = chip->vendor.priv;
u8 original_int_vec;
if (devm_request_irq(chip->pdev, irq, tis_int_handler, flags,
chip->devname, chip) != 0) {
dev_info(chip->pdev, "Unable to request irq: %d for probe\n",
irq);
return -1;
}
chip->vendor.irq = irq;
original_int_vec = ioread8(chip->vendor.iobase +
TPM_INT_VECTOR(chip->vendor.locality));
iowrite8(irq,
chip->vendor.iobase + TPM_INT_VECTOR(chip->vendor.locality));
/* Clear all existing */
iowrite32(ioread32(chip->vendor.iobase +
TPM_INT_STATUS(chip->vendor.locality)),
chip->vendor.iobase + TPM_INT_STATUS(chip->vendor.locality));
/* Turn on */
iowrite32(intmask | TPM_GLOBAL_INT_ENABLE,
chip->vendor.iobase + TPM_INT_ENABLE(chip->vendor.locality));
priv->irq_tested = false;
/* Generate an interrupt by having the core call through to
* tpm_tis_send
*/
if (chip->flags & TPM_CHIP_FLAG_TPM2)
tpm2_gen_interrupt(chip);
else
tpm_gen_interrupt(chip);
/* tpm_tis_send will either confirm the interrupt is working or it
* will call disable_irq which undoes all of the above.
*/
if (!chip->vendor.irq) {
iowrite8(original_int_vec,
chip->vendor.iobase +
TPM_INT_VECTOR(chip->vendor.locality));
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)
{
u8 original_int_vec;
int i;
original_int_vec = ioread8(chip->vendor.iobase +
TPM_INT_VECTOR(chip->vendor.locality));
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;
}
static bool interrupts = true;
module_param(interrupts, bool, 0444);
MODULE_PARM_DESC(interrupts, "Enable interrupts");
static void tpm_tis_remove(struct tpm_chip *chip)
{
if (chip->flags & TPM_CHIP_FLAG_TPM2)
tpm2_shutdown(chip, TPM2_SU_CLEAR);
iowrite32(~TPM_GLOBAL_INT_ENABLE &
ioread32(chip->vendor.iobase +
TPM_INT_ENABLE(chip->vendor.
locality)),
chip->vendor.iobase +
TPM_INT_ENABLE(chip->vendor.locality));
release_locality(chip, chip->vendor.locality, 1);
}
static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
acpi_handle acpi_dev_handle)
{
u32 vendor, intfcaps, intmask;
int rc, probe;
struct tpm_chip *chip;
struct priv_data *priv;
priv = devm_kzalloc(dev, sizeof(struct priv_data), GFP_KERNEL);
if (priv == NULL)
return -ENOMEM;
chip = tpmm_chip_alloc(dev, &tpm_tis);
if (IS_ERR(chip))
return PTR_ERR(chip);
chip->vendor.priv = priv;
#ifdef CONFIG_ACPI
chip->acpi_dev_handle = acpi_dev_handle;
#endif
chip->vendor.iobase = devm_ioremap_resource(dev, &tpm_info->res);
if (IS_ERR(chip->vendor.iobase))
return PTR_ERR(chip->vendor.iobase);
/* Maximum timeouts */
chip->vendor.timeout_a = TIS_TIMEOUT_A_MAX;
chip->vendor.timeout_b = TIS_TIMEOUT_B_MAX;
chip->vendor.timeout_c = TIS_TIMEOUT_C_MAX;
chip->vendor.timeout_d = TIS_TIMEOUT_D_MAX;
if (wait_startup(chip, 0) != 0) {
rc = -ENODEV;
goto out_err;
}
/* Take control of the TPM's interrupt hardware and shut it off */
intmask = ioread32(chip->vendor.iobase +
TPM_INT_ENABLE(chip->vendor.locality));
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;
iowrite32(intmask,
chip->vendor.iobase + TPM_INT_ENABLE(chip->vendor.locality));
if (request_locality(chip, 0) != 0) {
rc = -ENODEV;
goto out_err;
}
rc = tpm2_probe(chip);
if (rc)
goto out_err;
vendor = ioread32(chip->vendor.iobase + TPM_DID_VID(0));
chip->vendor.manufacturer_id = vendor;
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, ioread8(chip->vendor.iobase + TPM_RID(0)));
if (!itpm) {
probe = probe_itpm(chip);
if (probe < 0) {
rc = -ENODEV;
goto out_err;
}
itpm = !!probe;
}
if (itpm)
dev_info(dev, "Intel iTPM workaround enabled\n");
/* Figure out the capabilities */
intfcaps =
ioread32(chip->vendor.iobase +
TPM_INTF_CAPS(chip->vendor.locality));
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");
/* Very early on 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;
}
/* INTERRUPT Setup */
init_waitqueue_head(&chip->vendor.read_queue);
init_waitqueue_head(&chip->vendor.int_queue);
if (interrupts && tpm_info->irq != -1) {
if (tpm_info->irq) {
tpm_tis_probe_irq_single(chip, intmask, IRQF_SHARED,
tpm_info->irq);
if (!chip->vendor.irq)
dev_err(chip->pdev, FW_BUG
"TPM interrupt not working, polling instead\n");
} else
tpm_tis_probe_irq(chip, intmask);
}
if (chip->flags & TPM_CHIP_FLAG_TPM2) {
rc = tpm2_do_selftest(chip);
if (rc == TPM2_RC_INITIALIZE) {
dev_warn(dev, "Firmware has not started TPM\n");
rc = tpm2_startup(chip, TPM2_SU_CLEAR);
if (!rc)
rc = tpm2_do_selftest(chip);
}
if (rc) {
dev_err(dev, "TPM self test failed\n");
if (rc > 0)
rc = -ENODEV;
goto out_err;
}
} else {
if (tpm_do_selftest(chip)) {
dev_err(dev, "TPM self test failed\n");
rc = -ENODEV;
goto out_err;
}
}
return tpm_chip_register(chip);
out_err:
tpm_tis_remove(chip);
return rc;
}
#ifdef CONFIG_PM_SLEEP
static void tpm_tis_reenable_interrupts(struct tpm_chip *chip)
{
u32 intmask;
/* reenable interrupts that device may have lost or
BIOS/firmware may have disabled */
iowrite8(chip->vendor.irq, chip->vendor.iobase +
TPM_INT_VECTOR(chip->vendor.locality));
intmask =
ioread32(chip->vendor.iobase +
TPM_INT_ENABLE(chip->vendor.locality));
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;
iowrite32(intmask,
chip->vendor.iobase + TPM_INT_ENABLE(chip->vendor.locality));
}
static int tpm_tis_resume(struct device *dev)
{
struct tpm_chip *chip = dev_get_drvdata(dev);
int ret;
if (chip->vendor.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;
}
#endif
static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_resume);
static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
const struct pnp_device_id *pnp_id)
{
struct tpm_info tpm_info = {};
acpi_handle acpi_dev_handle = NULL;
struct resource *res;
res = pnp_get_resource(pnp_dev, IORESOURCE_MEM, 0);
if (!res)
return -ENODEV;
tpm_info.res = *res;
if (pnp_irq_valid(pnp_dev, 0))
tpm_info.irq = pnp_irq(pnp_dev, 0);
else
tpm_info.irq = -1;
if (pnp_acpi_device(pnp_dev)) {
if (is_itpm(pnp_acpi_device(pnp_dev)))
itpm = true;
acpi_dev_handle = ACPI_HANDLE(&pnp_dev->dev);
}
return tpm_tis_init(&pnp_dev->dev, &tpm_info, acpi_dev_handle);
}
static struct pnp_device_id tpm_pnp_tbl[] = {
{"PNP0C31", 0}, /* TPM */
{"ATM1200", 0}, /* Atmel */
{"IFX0102", 0}, /* Infineon */
{"BCM0101", 0}, /* Broadcom */
{"BCM0102", 0}, /* Broadcom */
{"NSC1200", 0}, /* National */
{"ICO0102", 0}, /* Intel */
/* Add new here */
{"", 0}, /* User Specified */
{"", 0} /* Terminator */
};
MODULE_DEVICE_TABLE(pnp, tpm_pnp_tbl);
static void tpm_tis_pnp_remove(struct pnp_dev *dev)
{
struct tpm_chip *chip = pnp_get_drvdata(dev);
tpm_chip_unregister(chip);
tpm_tis_remove(chip);
}
static struct pnp_driver tis_pnp_driver = {
.name = "tpm_tis",
.id_table = tpm_pnp_tbl,
.probe = tpm_tis_pnp_init,
.remove = tpm_tis_pnp_remove,
.driver = {
.pm = &tpm_tis_pm,
},
};
#define TIS_HID_USR_IDX sizeof(tpm_pnp_tbl)/sizeof(struct pnp_device_id) -2
module_param_string(hid, tpm_pnp_tbl[TIS_HID_USR_IDX].id,
sizeof(tpm_pnp_tbl[TIS_HID_USR_IDX].id), 0444);
MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe");
#ifdef CONFIG_ACPI
static int tpm_check_resource(struct acpi_resource *ares, void *data)
{
struct tpm_info *tpm_info = (struct tpm_info *) data;
struct resource res;
if (acpi_dev_resource_interrupt(ares, 0, &res))
tpm_info->irq = res.start;
else if (acpi_dev_resource_memory(ares, &res)) {
tpm_info->res = res;
tpm_info->res.name = NULL;
}
return 1;
}
static int tpm_tis_acpi_init(struct acpi_device *acpi_dev)
{
struct acpi_table_tpm2 *tbl;
acpi_status st;
struct list_head resources;
struct tpm_info tpm_info = {};
int ret;
st = acpi_get_table(ACPI_SIG_TPM2, 1,
(struct acpi_table_header **) &tbl);
if (ACPI_FAILURE(st) || tbl->header.length < sizeof(*tbl)) {
dev_err(&acpi_dev->dev,
FW_BUG "failed to get TPM2 ACPI table\n");
return -EINVAL;
}
if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED)
return -ENODEV;
INIT_LIST_HEAD(&resources);
tpm_info.irq = -1;
ret = acpi_dev_get_resources(acpi_dev, &resources, tpm_check_resource,
&tpm_info);
if (ret < 0)
return ret;
acpi_dev_free_resource_list(&resources);
if (resource_type(&tpm_info.res) != IORESOURCE_MEM) {
dev_err(&acpi_dev->dev,
FW_BUG "TPM2 ACPI table does not define a memory resource\n");
return -EINVAL;
}
if (is_itpm(acpi_dev))
itpm = true;
return tpm_tis_init(&acpi_dev->dev, &tpm_info, acpi_dev->handle);
}
static int tpm_tis_acpi_remove(struct acpi_device *dev)
{
struct tpm_chip *chip = dev_get_drvdata(&dev->dev);
tpm_chip_unregister(chip);
tpm_tis_remove(chip);
return 0;
}
static struct acpi_device_id tpm_acpi_tbl[] = {
{"MSFT0101", 0}, /* TPM 2.0 */
/* Add new here */
{"", 0}, /* User Specified */
{"", 0} /* Terminator */
};
MODULE_DEVICE_TABLE(acpi, tpm_acpi_tbl);
static struct acpi_driver tis_acpi_driver = {
.name = "tpm_tis",
.ids = tpm_acpi_tbl,
.ops = {
.add = tpm_tis_acpi_init,
.remove = tpm_tis_acpi_remove,
},
.drv = {
.pm = &tpm_tis_pm,
},
};
#endif
static struct platform_device *force_pdev;
static int tpm_tis_plat_probe(struct platform_device *pdev)
{
struct tpm_info tpm_info = {};
struct resource *res;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL) {
dev_err(&pdev->dev, "no memory resource defined\n");
return -ENODEV;
}
tpm_info.res = *res;
res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (res) {
tpm_info.irq = res->start;
} else {
if (pdev == force_pdev)
tpm_info.irq = -1;
else
/* When forcing auto probe the IRQ */
tpm_info.irq = 0;
}
return tpm_tis_init(&pdev->dev, &tpm_info, NULL);
}
static int tpm_tis_plat_remove(struct platform_device *pdev)
{
struct tpm_chip *chip = dev_get_drvdata(&pdev->dev);
tpm_chip_unregister(chip);
tpm_tis_remove(chip);
return 0;
}
static struct platform_driver tis_drv = {
.probe = tpm_tis_plat_probe,
.remove = tpm_tis_plat_remove,
.driver = {
.name = "tpm_tis",
.pm = &tpm_tis_pm,
},
};
static bool force;
#ifdef CONFIG_X86
module_param(force, bool, 0444);
MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry");
#endif
static int tpm_tis_force_device(void)
{
struct platform_device *pdev;
static const struct resource x86_resources[] = {
{
.start = 0xFED40000,
.end = 0xFED40000 + TIS_MEM_LEN - 1,
.flags = IORESOURCE_MEM,
},
};
if (!force)
return 0;
/* The driver core will match the name tpm_tis of the device to
* the tpm_tis platform driver and complete the setup via
* tpm_tis_plat_probe
*/
pdev = platform_device_register_simple("tpm_tis", -1, x86_resources,
ARRAY_SIZE(x86_resources));
if (IS_ERR(pdev))
return PTR_ERR(pdev);
force_pdev = pdev;
return 0;
}
static int __init init_tis(void)
{
int rc;
rc = tpm_tis_force_device();
if (rc)
goto err_force;
rc = platform_driver_register(&tis_drv);
if (rc)
goto err_platform;
#ifdef CONFIG_ACPI
rc = acpi_bus_register_driver(&tis_acpi_driver);
if (rc)
goto err_acpi;
#endif
if (IS_ENABLED(CONFIG_PNP)) {
rc = pnp_register_driver(&tis_pnp_driver);
if (rc)
goto err_pnp;
}
return 0;
err_pnp:
#ifdef CONFIG_ACPI
acpi_bus_unregister_driver(&tis_acpi_driver);
err_acpi:
#endif
platform_device_unregister(force_pdev);
err_platform:
if (force_pdev)
platform_device_unregister(force_pdev);
err_force:
return rc;
}
static void __exit cleanup_tis(void)
{
pnp_unregister_driver(&tis_pnp_driver);
#ifdef CONFIG_ACPI
acpi_bus_unregister_driver(&tis_acpi_driver);
#endif
platform_driver_unregister(&tis_drv);
if (force_pdev)
platform_device_unregister(force_pdev);
}
module_init(init_tis);
module_exit(cleanup_tis);
MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
MODULE_DESCRIPTION("TPM Driver");
MODULE_VERSION("2.0");
MODULE_LICENSE("GPL");
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