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-rw-r--r--drivers/char/tpm/st33zp24/Kconfig30
-rw-r--r--drivers/char/tpm/st33zp24/Makefile13
-rw-r--r--drivers/char/tpm/st33zp24/i2c.c173
-rw-r--r--drivers/char/tpm/st33zp24/spi.c290
-rw-r--r--drivers/char/tpm/st33zp24/st33zp24.c588
-rw-r--r--drivers/char/tpm/st33zp24/st33zp24.h41
6 files changed, 1135 insertions, 0 deletions
diff --git a/drivers/char/tpm/st33zp24/Kconfig b/drivers/char/tpm/st33zp24/Kconfig
new file mode 100644
index 0000000000..601c2ae5bf
--- /dev/null
+++ b/drivers/char/tpm/st33zp24/Kconfig
@@ -0,0 +1,30 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config TCG_TIS_ST33ZP24
+ tristate
+ help
+ STMicroelectronics ST33ZP24 core driver. It implements the core
+ TPM1.2 logic and hooks into the TPM kernel APIs. Physical layers will
+ register against it.
+
+ To compile this driver as a module, choose m here. The module will be called
+ tpm_st33zp24.
+
+config TCG_TIS_ST33ZP24_I2C
+ tristate "STMicroelectronics TPM Interface Specification 1.2 Interface (I2C)"
+ depends on I2C
+ select TCG_TIS_ST33ZP24
+ help
+ This module adds support for the STMicroelectronics TPM security chip
+ ST33ZP24 with i2c interface.
+ To compile this driver as a module, choose M here; the module will be
+ called tpm_st33zp24_i2c.
+
+config TCG_TIS_ST33ZP24_SPI
+ tristate "STMicroelectronics TPM Interface Specification 1.2 Interface (SPI)"
+ depends on SPI
+ select TCG_TIS_ST33ZP24
+ help
+ This module adds support for the STMicroelectronics TPM security chip
+ ST33ZP24 with spi interface.
+ To compile this driver as a module, choose M here; the module will be
+ called tpm_st33zp24_spi.
diff --git a/drivers/char/tpm/st33zp24/Makefile b/drivers/char/tpm/st33zp24/Makefile
new file mode 100644
index 0000000000..649e41107d
--- /dev/null
+++ b/drivers/char/tpm/st33zp24/Makefile
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for ST33ZP24 TPM 1.2 driver
+#
+
+tpm_st33zp24-objs = st33zp24.o
+obj-$(CONFIG_TCG_TIS_ST33ZP24) += tpm_st33zp24.o
+
+tpm_st33zp24_i2c-objs = i2c.o
+obj-$(CONFIG_TCG_TIS_ST33ZP24_I2C) += tpm_st33zp24_i2c.o
+
+tpm_st33zp24_spi-objs = spi.o
+obj-$(CONFIG_TCG_TIS_ST33ZP24_SPI) += tpm_st33zp24_spi.o
diff --git a/drivers/char/tpm/st33zp24/i2c.c b/drivers/char/tpm/st33zp24/i2c.c
new file mode 100644
index 0000000000..661574bb0a
--- /dev/null
+++ b/drivers/char/tpm/st33zp24/i2c.c
@@ -0,0 +1,173 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * STMicroelectronics TPM I2C Linux driver for TPM ST33ZP24
+ * Copyright (C) 2009 - 2016 STMicroelectronics
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/of.h>
+#include <linux/acpi.h>
+#include <linux/tpm.h>
+
+#include "../tpm.h"
+#include "st33zp24.h"
+
+#define TPM_DUMMY_BYTE 0xAA
+
+struct st33zp24_i2c_phy {
+ struct i2c_client *client;
+ u8 buf[ST33ZP24_BUFSIZE + 1];
+};
+
+/*
+ * write8_reg
+ * Send byte to the TIS register according to the ST33ZP24 I2C protocol.
+ * @param: tpm_register, the tpm tis register where the data should be written
+ * @param: tpm_data, the tpm_data to write inside the tpm_register
+ * @param: tpm_size, The length of the data
+ * @return: Returns negative errno, or else the number of bytes written.
+ */
+static int write8_reg(void *phy_id, u8 tpm_register, u8 *tpm_data, int tpm_size)
+{
+ struct st33zp24_i2c_phy *phy = phy_id;
+
+ phy->buf[0] = tpm_register;
+ memcpy(phy->buf + 1, tpm_data, tpm_size);
+ return i2c_master_send(phy->client, phy->buf, tpm_size + 1);
+} /* write8_reg() */
+
+/*
+ * read8_reg
+ * Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
+ * @param: tpm_register, the tpm tis register where the data should be read
+ * @param: tpm_data, the TPM response
+ * @param: tpm_size, tpm TPM response size to read.
+ * @return: number of byte read successfully: should be one if success.
+ */
+static int read8_reg(void *phy_id, u8 tpm_register, u8 *tpm_data, int tpm_size)
+{
+ struct st33zp24_i2c_phy *phy = phy_id;
+ u8 status = 0;
+ u8 data;
+
+ data = TPM_DUMMY_BYTE;
+ status = write8_reg(phy, tpm_register, &data, 1);
+ if (status == 2)
+ status = i2c_master_recv(phy->client, tpm_data, tpm_size);
+ return status;
+} /* read8_reg() */
+
+/*
+ * st33zp24_i2c_send
+ * Send byte to the TIS register according to the ST33ZP24 I2C protocol.
+ * @param: phy_id, the phy description
+ * @param: tpm_register, the tpm tis register where the data should be written
+ * @param: tpm_data, the tpm_data to write inside the tpm_register
+ * @param: tpm_size, the length of the data
+ * @return: number of byte written successfully: should be one if success.
+ */
+static int st33zp24_i2c_send(void *phy_id, u8 tpm_register, u8 *tpm_data,
+ int tpm_size)
+{
+ return write8_reg(phy_id, tpm_register | TPM_WRITE_DIRECTION, tpm_data,
+ tpm_size);
+}
+
+/*
+ * st33zp24_i2c_recv
+ * Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
+ * @param: phy_id, the phy description
+ * @param: tpm_register, the tpm tis register where the data should be read
+ * @param: tpm_data, the TPM response
+ * @param: tpm_size, tpm TPM response size to read.
+ * @return: number of byte read successfully: should be one if success.
+ */
+static int st33zp24_i2c_recv(void *phy_id, u8 tpm_register, u8 *tpm_data,
+ int tpm_size)
+{
+ return read8_reg(phy_id, tpm_register, tpm_data, tpm_size);
+}
+
+static const struct st33zp24_phy_ops i2c_phy_ops = {
+ .send = st33zp24_i2c_send,
+ .recv = st33zp24_i2c_recv,
+};
+
+/*
+ * st33zp24_i2c_probe initialize the TPM device
+ * @param: client, the i2c_client description (TPM I2C description).
+ * @param: id, the i2c_device_id struct.
+ * @return: 0 in case of success.
+ * -1 in other case.
+ */
+static int st33zp24_i2c_probe(struct i2c_client *client)
+{
+ struct st33zp24_i2c_phy *phy;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ dev_info(&client->dev, "client not i2c capable\n");
+ return -ENODEV;
+ }
+
+ phy = devm_kzalloc(&client->dev, sizeof(struct st33zp24_i2c_phy),
+ GFP_KERNEL);
+ if (!phy)
+ return -ENOMEM;
+
+ phy->client = client;
+
+ return st33zp24_probe(phy, &i2c_phy_ops, &client->dev, client->irq);
+}
+
+/*
+ * st33zp24_i2c_remove remove the TPM device
+ * @param: client, the i2c_client description (TPM I2C description).
+ * @return: 0 in case of success.
+ */
+static void st33zp24_i2c_remove(struct i2c_client *client)
+{
+ struct tpm_chip *chip = i2c_get_clientdata(client);
+
+ st33zp24_remove(chip);
+}
+
+static const struct i2c_device_id st33zp24_i2c_id[] = {
+ {TPM_ST33_I2C, 0},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, st33zp24_i2c_id);
+
+static const struct of_device_id of_st33zp24_i2c_match[] __maybe_unused = {
+ { .compatible = "st,st33zp24-i2c", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, of_st33zp24_i2c_match);
+
+static const struct acpi_device_id st33zp24_i2c_acpi_match[] __maybe_unused = {
+ {"SMO3324"},
+ {}
+};
+MODULE_DEVICE_TABLE(acpi, st33zp24_i2c_acpi_match);
+
+static SIMPLE_DEV_PM_OPS(st33zp24_i2c_ops, st33zp24_pm_suspend,
+ st33zp24_pm_resume);
+
+static struct i2c_driver st33zp24_i2c_driver = {
+ .driver = {
+ .name = TPM_ST33_I2C,
+ .pm = &st33zp24_i2c_ops,
+ .of_match_table = of_match_ptr(of_st33zp24_i2c_match),
+ .acpi_match_table = ACPI_PTR(st33zp24_i2c_acpi_match),
+ },
+ .probe = st33zp24_i2c_probe,
+ .remove = st33zp24_i2c_remove,
+ .id_table = st33zp24_i2c_id
+};
+
+module_i2c_driver(st33zp24_i2c_driver);
+
+MODULE_AUTHOR("TPM support (TPMsupport@list.st.com)");
+MODULE_DESCRIPTION("STM TPM 1.2 I2C ST33 Driver");
+MODULE_VERSION("1.3.0");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/tpm/st33zp24/spi.c b/drivers/char/tpm/st33zp24/spi.c
new file mode 100644
index 0000000000..f5811b301d
--- /dev/null
+++ b/drivers/char/tpm/st33zp24/spi.c
@@ -0,0 +1,290 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * STMicroelectronics TPM SPI Linux driver for TPM ST33ZP24
+ * Copyright (C) 2009 - 2016 STMicroelectronics
+ */
+
+#include <linux/module.h>
+#include <linux/spi/spi.h>
+#include <linux/of.h>
+#include <linux/acpi.h>
+#include <linux/tpm.h>
+
+#include "../tpm.h"
+#include "st33zp24.h"
+
+#define TPM_DATA_FIFO 0x24
+#define TPM_INTF_CAPABILITY 0x14
+
+#define TPM_DUMMY_BYTE 0x00
+
+#define MAX_SPI_LATENCY 15
+#define LOCALITY0 0
+
+#define ST33ZP24_OK 0x5A
+#define ST33ZP24_UNDEFINED_ERR 0x80
+#define ST33ZP24_BADLOCALITY 0x81
+#define ST33ZP24_TISREGISTER_UNKNOWN 0x82
+#define ST33ZP24_LOCALITY_NOT_ACTIVATED 0x83
+#define ST33ZP24_HASH_END_BEFORE_HASH_START 0x84
+#define ST33ZP24_BAD_COMMAND_ORDER 0x85
+#define ST33ZP24_INCORECT_RECEIVED_LENGTH 0x86
+#define ST33ZP24_TPM_FIFO_OVERFLOW 0x89
+#define ST33ZP24_UNEXPECTED_READ_FIFO 0x8A
+#define ST33ZP24_UNEXPECTED_WRITE_FIFO 0x8B
+#define ST33ZP24_CMDRDY_SET_WHEN_PROCESSING_HASH_END 0x90
+#define ST33ZP24_DUMMY_BYTES 0x00
+
+/*
+ * TPM command can be up to 2048 byte, A TPM response can be up to
+ * 1024 byte.
+ * Between command and response, there are latency byte (up to 15
+ * usually on st33zp24 2 are enough).
+ *
+ * Overall when sending a command and expecting an answer we need if
+ * worst case:
+ * 2048 (for the TPM command) + 1024 (for the TPM answer). We need
+ * some latency byte before the answer is available (max 15).
+ * We have 2048 + 1024 + 15.
+ */
+#define ST33ZP24_SPI_BUFFER_SIZE (ST33ZP24_BUFSIZE + (ST33ZP24_BUFSIZE / 2) +\
+ MAX_SPI_LATENCY)
+
+
+struct st33zp24_spi_phy {
+ struct spi_device *spi_device;
+
+ u8 tx_buf[ST33ZP24_SPI_BUFFER_SIZE];
+ u8 rx_buf[ST33ZP24_SPI_BUFFER_SIZE];
+
+ int latency;
+};
+
+static int st33zp24_status_to_errno(u8 code)
+{
+ switch (code) {
+ case ST33ZP24_OK:
+ return 0;
+ case ST33ZP24_UNDEFINED_ERR:
+ case ST33ZP24_BADLOCALITY:
+ case ST33ZP24_TISREGISTER_UNKNOWN:
+ case ST33ZP24_LOCALITY_NOT_ACTIVATED:
+ case ST33ZP24_HASH_END_BEFORE_HASH_START:
+ case ST33ZP24_BAD_COMMAND_ORDER:
+ case ST33ZP24_UNEXPECTED_READ_FIFO:
+ case ST33ZP24_UNEXPECTED_WRITE_FIFO:
+ case ST33ZP24_CMDRDY_SET_WHEN_PROCESSING_HASH_END:
+ return -EPROTO;
+ case ST33ZP24_INCORECT_RECEIVED_LENGTH:
+ case ST33ZP24_TPM_FIFO_OVERFLOW:
+ return -EMSGSIZE;
+ case ST33ZP24_DUMMY_BYTES:
+ return -ENOSYS;
+ }
+ return code;
+}
+
+/*
+ * st33zp24_spi_send
+ * Send byte to the TIS register according to the ST33ZP24 SPI protocol.
+ * @param: phy_id, the phy description
+ * @param: tpm_register, the tpm tis register where the data should be written
+ * @param: tpm_data, the tpm_data to write inside the tpm_register
+ * @param: tpm_size, The length of the data
+ * @return: should be zero if success else a negative error code.
+ */
+static int st33zp24_spi_send(void *phy_id, u8 tpm_register, u8 *tpm_data,
+ int tpm_size)
+{
+ int total_length = 0, ret = 0;
+ struct st33zp24_spi_phy *phy = phy_id;
+ struct spi_device *dev = phy->spi_device;
+ struct spi_transfer spi_xfer = {
+ .tx_buf = phy->tx_buf,
+ .rx_buf = phy->rx_buf,
+ };
+
+ /* Pre-Header */
+ phy->tx_buf[total_length++] = TPM_WRITE_DIRECTION | LOCALITY0;
+ phy->tx_buf[total_length++] = tpm_register;
+
+ if (tpm_size > 0 && tpm_register == TPM_DATA_FIFO) {
+ phy->tx_buf[total_length++] = tpm_size >> 8;
+ phy->tx_buf[total_length++] = tpm_size;
+ }
+
+ memcpy(&phy->tx_buf[total_length], tpm_data, tpm_size);
+ total_length += tpm_size;
+
+ memset(&phy->tx_buf[total_length], TPM_DUMMY_BYTE, phy->latency);
+
+ spi_xfer.len = total_length + phy->latency;
+
+ ret = spi_sync_transfer(dev, &spi_xfer, 1);
+ if (ret == 0)
+ ret = phy->rx_buf[total_length + phy->latency - 1];
+
+ return st33zp24_status_to_errno(ret);
+} /* st33zp24_spi_send() */
+
+/*
+ * st33zp24_spi_read8_recv
+ * Recv byte from the TIS register according to the ST33ZP24 SPI protocol.
+ * @param: phy_id, the phy description
+ * @param: tpm_register, the tpm tis register where the data should be read
+ * @param: tpm_data, the TPM response
+ * @param: tpm_size, tpm TPM response size to read.
+ * @return: should be zero if success else a negative error code.
+ */
+static int st33zp24_spi_read8_reg(void *phy_id, u8 tpm_register, u8 *tpm_data,
+ int tpm_size)
+{
+ int total_length = 0, ret;
+ struct st33zp24_spi_phy *phy = phy_id;
+ struct spi_device *dev = phy->spi_device;
+ struct spi_transfer spi_xfer = {
+ .tx_buf = phy->tx_buf,
+ .rx_buf = phy->rx_buf,
+ };
+
+ /* Pre-Header */
+ phy->tx_buf[total_length++] = LOCALITY0;
+ phy->tx_buf[total_length++] = tpm_register;
+
+ memset(&phy->tx_buf[total_length], TPM_DUMMY_BYTE,
+ phy->latency + tpm_size);
+
+ spi_xfer.len = total_length + phy->latency + tpm_size;
+
+ /* header + status byte + size of the data + status byte */
+ ret = spi_sync_transfer(dev, &spi_xfer, 1);
+ if (tpm_size > 0 && ret == 0) {
+ ret = phy->rx_buf[total_length + phy->latency - 1];
+
+ memcpy(tpm_data, phy->rx_buf + total_length + phy->latency,
+ tpm_size);
+ }
+
+ return ret;
+} /* st33zp24_spi_read8_reg() */
+
+/*
+ * st33zp24_spi_recv
+ * Recv byte from the TIS register according to the ST33ZP24 SPI protocol.
+ * @param: phy_id, the phy description
+ * @param: tpm_register, the tpm tis register where the data should be read
+ * @param: tpm_data, the TPM response
+ * @param: tpm_size, tpm TPM response size to read.
+ * @return: number of byte read successfully: should be one if success.
+ */
+static int st33zp24_spi_recv(void *phy_id, u8 tpm_register, u8 *tpm_data,
+ int tpm_size)
+{
+ int ret;
+
+ ret = st33zp24_spi_read8_reg(phy_id, tpm_register, tpm_data, tpm_size);
+ if (!st33zp24_status_to_errno(ret))
+ return tpm_size;
+ return ret;
+} /* st33zp24_spi_recv() */
+
+static int st33zp24_spi_evaluate_latency(void *phy_id)
+{
+ struct st33zp24_spi_phy *phy = phy_id;
+ int latency = 1, status = 0;
+ u8 data = 0;
+
+ while (!status && latency < MAX_SPI_LATENCY) {
+ phy->latency = latency;
+ status = st33zp24_spi_read8_reg(phy_id, TPM_INTF_CAPABILITY,
+ &data, 1);
+ latency++;
+ }
+ if (status < 0)
+ return status;
+ if (latency == MAX_SPI_LATENCY)
+ return -ENODEV;
+
+ return latency - 1;
+} /* evaluate_latency() */
+
+static const struct st33zp24_phy_ops spi_phy_ops = {
+ .send = st33zp24_spi_send,
+ .recv = st33zp24_spi_recv,
+};
+
+/*
+ * st33zp24_spi_probe initialize the TPM device
+ * @param: dev, the spi_device description (TPM SPI description).
+ * @return: 0 in case of success.
+ * or a negative value describing the error.
+ */
+static int st33zp24_spi_probe(struct spi_device *dev)
+{
+ struct st33zp24_spi_phy *phy;
+
+ phy = devm_kzalloc(&dev->dev, sizeof(struct st33zp24_spi_phy),
+ GFP_KERNEL);
+ if (!phy)
+ return -ENOMEM;
+
+ phy->spi_device = dev;
+
+ phy->latency = st33zp24_spi_evaluate_latency(phy);
+ if (phy->latency <= 0)
+ return -ENODEV;
+
+ return st33zp24_probe(phy, &spi_phy_ops, &dev->dev, dev->irq);
+}
+
+/*
+ * st33zp24_spi_remove remove the TPM device
+ * @param: client, the spi_device description (TPM SPI description).
+ * @return: 0 in case of success.
+ */
+static void st33zp24_spi_remove(struct spi_device *dev)
+{
+ struct tpm_chip *chip = spi_get_drvdata(dev);
+
+ st33zp24_remove(chip);
+}
+
+static const struct spi_device_id st33zp24_spi_id[] = {
+ {TPM_ST33_SPI, 0},
+ {}
+};
+MODULE_DEVICE_TABLE(spi, st33zp24_spi_id);
+
+static const struct of_device_id of_st33zp24_spi_match[] __maybe_unused = {
+ { .compatible = "st,st33zp24-spi", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, of_st33zp24_spi_match);
+
+static const struct acpi_device_id st33zp24_spi_acpi_match[] __maybe_unused = {
+ {"SMO3324"},
+ {}
+};
+MODULE_DEVICE_TABLE(acpi, st33zp24_spi_acpi_match);
+
+static SIMPLE_DEV_PM_OPS(st33zp24_spi_ops, st33zp24_pm_suspend,
+ st33zp24_pm_resume);
+
+static struct spi_driver st33zp24_spi_driver = {
+ .driver = {
+ .name = "st33zp24-spi",
+ .pm = &st33zp24_spi_ops,
+ .of_match_table = of_match_ptr(of_st33zp24_spi_match),
+ .acpi_match_table = ACPI_PTR(st33zp24_spi_acpi_match),
+ },
+ .probe = st33zp24_spi_probe,
+ .remove = st33zp24_spi_remove,
+ .id_table = st33zp24_spi_id,
+};
+
+module_spi_driver(st33zp24_spi_driver);
+
+MODULE_AUTHOR("TPM support (TPMsupport@list.st.com)");
+MODULE_DESCRIPTION("STM TPM 1.2 SPI ST33 Driver");
+MODULE_VERSION("1.3.0");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/tpm/st33zp24/st33zp24.c b/drivers/char/tpm/st33zp24/st33zp24.c
new file mode 100644
index 0000000000..a5b554cd47
--- /dev/null
+++ b/drivers/char/tpm/st33zp24/st33zp24.c
@@ -0,0 +1,588 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * STMicroelectronics TPM Linux driver for TPM ST33ZP24
+ * Copyright (C) 2009 - 2016 STMicroelectronics
+ */
+
+#include <linux/acpi.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/wait.h>
+#include <linux/freezer.h>
+#include <linux/string.h>
+#include <linux/interrupt.h>
+#include <linux/gpio/consumer.h>
+#include <linux/sched.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+
+#include "../tpm.h"
+#include "st33zp24.h"
+
+#define TPM_ACCESS 0x0
+#define TPM_STS 0x18
+#define TPM_DATA_FIFO 0x24
+#define TPM_INTF_CAPABILITY 0x14
+#define TPM_INT_STATUS 0x10
+#define TPM_INT_ENABLE 0x08
+
+#define LOCALITY0 0
+
+enum st33zp24_access {
+ TPM_ACCESS_VALID = 0x80,
+ TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
+ TPM_ACCESS_REQUEST_PENDING = 0x04,
+ TPM_ACCESS_REQUEST_USE = 0x02,
+};
+
+enum st33zp24_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 st33zp24_int_flags {
+ TPM_GLOBAL_INT_ENABLE = 0x80,
+ TPM_INTF_CMD_READY_INT = 0x080,
+ TPM_INTF_FIFO_AVALAIBLE_INT = 0x040,
+ TPM_INTF_WAKE_UP_READY_INT = 0x020,
+ TPM_INTF_LOCALITY_CHANGE_INT = 0x004,
+ TPM_INTF_STS_VALID_INT = 0x002,
+ TPM_INTF_DATA_AVAIL_INT = 0x001,
+};
+
+enum tis_defaults {
+ TIS_SHORT_TIMEOUT = 750,
+ TIS_LONG_TIMEOUT = 2000,
+};
+
+/*
+ * clear the pending interrupt.
+ */
+static u8 clear_interruption(struct st33zp24_dev *tpm_dev)
+{
+ u8 interrupt;
+
+ tpm_dev->ops->recv(tpm_dev->phy_id, TPM_INT_STATUS, &interrupt, 1);
+ tpm_dev->ops->send(tpm_dev->phy_id, TPM_INT_STATUS, &interrupt, 1);
+ return interrupt;
+}
+
+/*
+ * cancel the current command execution or set STS to COMMAND READY.
+ */
+static void st33zp24_cancel(struct tpm_chip *chip)
+{
+ struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
+ u8 data;
+
+ data = TPM_STS_COMMAND_READY;
+ tpm_dev->ops->send(tpm_dev->phy_id, TPM_STS, &data, 1);
+}
+
+/*
+ * return the TPM_STS register
+ */
+static u8 st33zp24_status(struct tpm_chip *chip)
+{
+ struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
+ u8 data;
+
+ tpm_dev->ops->recv(tpm_dev->phy_id, TPM_STS, &data, 1);
+ return data;
+}
+
+/*
+ * if the locality is active
+ */
+static bool check_locality(struct tpm_chip *chip)
+{
+ struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
+ u8 data;
+ u8 status;
+
+ status = tpm_dev->ops->recv(tpm_dev->phy_id, TPM_ACCESS, &data, 1);
+ if (status && (data &
+ (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
+ (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
+ return true;
+
+ return false;
+}
+
+static int request_locality(struct tpm_chip *chip)
+{
+ struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
+ unsigned long stop;
+ long ret;
+ u8 data;
+
+ if (check_locality(chip))
+ return tpm_dev->locality;
+
+ data = TPM_ACCESS_REQUEST_USE;
+ ret = tpm_dev->ops->send(tpm_dev->phy_id, TPM_ACCESS, &data, 1);
+ if (ret < 0)
+ return ret;
+
+ stop = jiffies + chip->timeout_a;
+
+ /* Request locality is usually effective after the request */
+ do {
+ if (check_locality(chip))
+ return tpm_dev->locality;
+ msleep(TPM_TIMEOUT);
+ } while (time_before(jiffies, stop));
+
+ /* could not get locality */
+ return -EACCES;
+}
+
+static void release_locality(struct tpm_chip *chip)
+{
+ struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
+ u8 data;
+
+ data = TPM_ACCESS_ACTIVE_LOCALITY;
+
+ tpm_dev->ops->send(tpm_dev->phy_id, TPM_ACCESS, &data, 1);
+}
+
+/*
+ * get_burstcount return the burstcount value
+ */
+static int get_burstcount(struct tpm_chip *chip)
+{
+ struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
+ unsigned long stop;
+ int burstcnt, status;
+ u8 temp;
+
+ stop = jiffies + chip->timeout_d;
+ do {
+ status = tpm_dev->ops->recv(tpm_dev->phy_id, TPM_STS + 1,
+ &temp, 1);
+ if (status < 0)
+ return -EBUSY;
+
+ burstcnt = temp;
+ status = tpm_dev->ops->recv(tpm_dev->phy_id, TPM_STS + 2,
+ &temp, 1);
+ if (status < 0)
+ return -EBUSY;
+
+ burstcnt |= temp << 8;
+ if (burstcnt)
+ return burstcnt;
+ msleep(TPM_TIMEOUT);
+ } while (time_before(jiffies, stop));
+ return -EBUSY;
+}
+
+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;
+}
+
+/*
+ * wait for a TPM_STS value
+ */
+static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
+ wait_queue_head_t *queue, bool check_cancel)
+{
+ struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
+ unsigned long stop;
+ int ret = 0;
+ bool canceled = false;
+ bool condition;
+ u32 cur_intrs;
+ u8 status;
+
+ /* check current status */
+ status = st33zp24_status(chip);
+ if ((status & mask) == mask)
+ return 0;
+
+ stop = jiffies + timeout;
+
+ if (chip->flags & TPM_CHIP_FLAG_IRQ) {
+ cur_intrs = tpm_dev->intrs;
+ clear_interruption(tpm_dev);
+ enable_irq(tpm_dev->irq);
+
+ do {
+ if (ret == -ERESTARTSYS && freezing(current))
+ clear_thread_flag(TIF_SIGPENDING);
+
+ timeout = stop - jiffies;
+ if ((long) timeout <= 0)
+ return -1;
+
+ ret = wait_event_interruptible_timeout(*queue,
+ cur_intrs != tpm_dev->intrs,
+ timeout);
+ clear_interruption(tpm_dev);
+ condition = wait_for_tpm_stat_cond(chip, mask,
+ check_cancel, &canceled);
+ if (ret >= 0 && condition) {
+ if (canceled)
+ return -ECANCELED;
+ return 0;
+ }
+ } while (ret == -ERESTARTSYS && freezing(current));
+
+ disable_irq_nosync(tpm_dev->irq);
+
+ } else {
+ do {
+ msleep(TPM_TIMEOUT);
+ status = chip->ops->status(chip);
+ if ((status & mask) == mask)
+ return 0;
+ } while (time_before(jiffies, stop));
+ }
+
+ return -ETIME;
+}
+
+static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
+{
+ struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
+ int size = 0, burstcnt, len, ret;
+
+ while (size < count &&
+ wait_for_stat(chip,
+ TPM_STS_DATA_AVAIL | TPM_STS_VALID,
+ chip->timeout_c,
+ &tpm_dev->read_queue, true) == 0) {
+ burstcnt = get_burstcount(chip);
+ if (burstcnt < 0)
+ return burstcnt;
+ len = min_t(int, burstcnt, count - size);
+ ret = tpm_dev->ops->recv(tpm_dev->phy_id, TPM_DATA_FIFO,
+ buf + size, len);
+ if (ret < 0)
+ return ret;
+
+ size += len;
+ }
+ return size;
+}
+
+static irqreturn_t tpm_ioserirq_handler(int irq, void *dev_id)
+{
+ struct tpm_chip *chip = dev_id;
+ struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
+
+ tpm_dev->intrs++;
+ wake_up_interruptible(&tpm_dev->read_queue);
+ disable_irq_nosync(tpm_dev->irq);
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * send TPM commands through the I2C bus.
+ */
+static int st33zp24_send(struct tpm_chip *chip, unsigned char *buf,
+ size_t len)
+{
+ struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
+ u32 status, i, size, ordinal;
+ int burstcnt = 0;
+ int ret;
+ u8 data;
+
+ if (len < TPM_HEADER_SIZE)
+ return -EBUSY;
+
+ ret = request_locality(chip);
+ if (ret < 0)
+ return ret;
+
+ status = st33zp24_status(chip);
+ if ((status & TPM_STS_COMMAND_READY) == 0) {
+ st33zp24_cancel(chip);
+ if (wait_for_stat
+ (chip, TPM_STS_COMMAND_READY, chip->timeout_b,
+ &tpm_dev->read_queue, false) < 0) {
+ ret = -ETIME;
+ goto out_err;
+ }
+ }
+
+ for (i = 0; i < len - 1;) {
+ burstcnt = get_burstcount(chip);
+ if (burstcnt < 0)
+ return burstcnt;
+ size = min_t(int, len - i - 1, burstcnt);
+ ret = tpm_dev->ops->send(tpm_dev->phy_id, TPM_DATA_FIFO,
+ buf + i, size);
+ if (ret < 0)
+ goto out_err;
+
+ i += size;
+ }
+
+ status = st33zp24_status(chip);
+ if ((status & TPM_STS_DATA_EXPECT) == 0) {
+ ret = -EIO;
+ goto out_err;
+ }
+
+ ret = tpm_dev->ops->send(tpm_dev->phy_id, TPM_DATA_FIFO,
+ buf + len - 1, 1);
+ if (ret < 0)
+ goto out_err;
+
+ status = st33zp24_status(chip);
+ if ((status & TPM_STS_DATA_EXPECT) != 0) {
+ ret = -EIO;
+ goto out_err;
+ }
+
+ data = TPM_STS_GO;
+ ret = tpm_dev->ops->send(tpm_dev->phy_id, TPM_STS, &data, 1);
+ if (ret < 0)
+ goto out_err;
+
+ if (chip->flags & TPM_CHIP_FLAG_IRQ) {
+ ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
+
+ ret = wait_for_stat(chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID,
+ tpm_calc_ordinal_duration(chip, ordinal),
+ &tpm_dev->read_queue, false);
+ if (ret < 0)
+ goto out_err;
+ }
+
+ return 0;
+out_err:
+ st33zp24_cancel(chip);
+ release_locality(chip);
+ return ret;
+}
+
+static int st33zp24_recv(struct tpm_chip *chip, unsigned char *buf,
+ size_t count)
+{
+ int size = 0;
+ u32 expected;
+
+ if (!chip)
+ return -EBUSY;
+
+ if (count < TPM_HEADER_SIZE) {
+ size = -EIO;
+ goto out;
+ }
+
+ size = recv_data(chip, buf, TPM_HEADER_SIZE);
+ 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;
+ }
+
+out:
+ st33zp24_cancel(chip);
+ release_locality(chip);
+ return size;
+}
+
+static bool st33zp24_req_canceled(struct tpm_chip *chip, u8 status)
+{
+ return (status == TPM_STS_COMMAND_READY);
+}
+
+static const struct tpm_class_ops st33zp24_tpm = {
+ .flags = TPM_OPS_AUTO_STARTUP,
+ .send = st33zp24_send,
+ .recv = st33zp24_recv,
+ .cancel = st33zp24_cancel,
+ .status = st33zp24_status,
+ .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
+ .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
+ .req_canceled = st33zp24_req_canceled,
+};
+
+static const struct acpi_gpio_params lpcpd_gpios = { 1, 0, false };
+
+static const struct acpi_gpio_mapping acpi_st33zp24_gpios[] = {
+ { "lpcpd-gpios", &lpcpd_gpios, 1 },
+ { },
+};
+
+/*
+ * initialize the TPM device
+ */
+int st33zp24_probe(void *phy_id, const struct st33zp24_phy_ops *ops,
+ struct device *dev, int irq)
+{
+ int ret;
+ u8 intmask = 0;
+ struct tpm_chip *chip;
+ struct st33zp24_dev *tpm_dev;
+
+ chip = tpmm_chip_alloc(dev, &st33zp24_tpm);
+ if (IS_ERR(chip))
+ return PTR_ERR(chip);
+
+ tpm_dev = devm_kzalloc(dev, sizeof(struct st33zp24_dev),
+ GFP_KERNEL);
+ if (!tpm_dev)
+ return -ENOMEM;
+
+ tpm_dev->phy_id = phy_id;
+ tpm_dev->ops = ops;
+ dev_set_drvdata(&chip->dev, tpm_dev);
+
+ chip->timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
+ chip->timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
+ chip->timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
+ chip->timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
+
+ tpm_dev->locality = LOCALITY0;
+
+ if (ACPI_COMPANION(dev)) {
+ ret = devm_acpi_dev_add_driver_gpios(dev, acpi_st33zp24_gpios);
+ if (ret)
+ return ret;
+ }
+
+ /*
+ * Get LPCPD GPIO. If lpcpd pin is not specified. This is not an
+ * issue as power management can be also managed by TPM specific
+ * commands.
+ */
+ tpm_dev->io_lpcpd = devm_gpiod_get_optional(dev, "lpcpd",
+ GPIOD_OUT_HIGH);
+ ret = PTR_ERR_OR_ZERO(tpm_dev->io_lpcpd);
+ if (ret) {
+ dev_err(dev, "failed to request lpcpd gpio: %d\n", ret);
+ return ret;
+ }
+
+ if (irq) {
+ /* INTERRUPT Setup */
+ init_waitqueue_head(&tpm_dev->read_queue);
+ tpm_dev->intrs = 0;
+
+ if (request_locality(chip) != LOCALITY0) {
+ ret = -ENODEV;
+ goto _tpm_clean_answer;
+ }
+
+ clear_interruption(tpm_dev);
+ ret = devm_request_irq(dev, irq, tpm_ioserirq_handler,
+ IRQF_TRIGGER_HIGH, "TPM SERIRQ management",
+ chip);
+ if (ret < 0) {
+ dev_err(&chip->dev, "TPM SERIRQ signals %d not available\n",
+ irq);
+ goto _tpm_clean_answer;
+ }
+
+ intmask |= TPM_INTF_CMD_READY_INT
+ | TPM_INTF_STS_VALID_INT
+ | TPM_INTF_DATA_AVAIL_INT;
+
+ ret = tpm_dev->ops->send(tpm_dev->phy_id, TPM_INT_ENABLE,
+ &intmask, 1);
+ if (ret < 0)
+ goto _tpm_clean_answer;
+
+ intmask = TPM_GLOBAL_INT_ENABLE;
+ ret = tpm_dev->ops->send(tpm_dev->phy_id, (TPM_INT_ENABLE + 3),
+ &intmask, 1);
+ if (ret < 0)
+ goto _tpm_clean_answer;
+
+ tpm_dev->irq = irq;
+ chip->flags |= TPM_CHIP_FLAG_IRQ;
+
+ disable_irq_nosync(tpm_dev->irq);
+ }
+
+ return tpm_chip_register(chip);
+_tpm_clean_answer:
+ dev_info(&chip->dev, "TPM initialization fail\n");
+ return ret;
+}
+EXPORT_SYMBOL(st33zp24_probe);
+
+void st33zp24_remove(struct tpm_chip *chip)
+{
+ tpm_chip_unregister(chip);
+}
+EXPORT_SYMBOL(st33zp24_remove);
+
+#ifdef CONFIG_PM_SLEEP
+int st33zp24_pm_suspend(struct device *dev)
+{
+ struct tpm_chip *chip = dev_get_drvdata(dev);
+ struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
+
+ int ret = 0;
+
+ if (tpm_dev->io_lpcpd)
+ gpiod_set_value_cansleep(tpm_dev->io_lpcpd, 0);
+ else
+ ret = tpm_pm_suspend(dev);
+
+ return ret;
+}
+EXPORT_SYMBOL(st33zp24_pm_suspend);
+
+int st33zp24_pm_resume(struct device *dev)
+{
+ struct tpm_chip *chip = dev_get_drvdata(dev);
+ struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
+ int ret = 0;
+
+ if (tpm_dev->io_lpcpd) {
+ gpiod_set_value_cansleep(tpm_dev->io_lpcpd, 1);
+ ret = wait_for_stat(chip,
+ TPM_STS_VALID, chip->timeout_b,
+ &tpm_dev->read_queue, false);
+ } else {
+ ret = tpm_pm_resume(dev);
+ if (!ret)
+ tpm1_do_selftest(chip);
+ }
+ return ret;
+}
+EXPORT_SYMBOL(st33zp24_pm_resume);
+#endif
+
+MODULE_AUTHOR("TPM support (TPMsupport@list.st.com)");
+MODULE_DESCRIPTION("ST33ZP24 TPM 1.2 driver");
+MODULE_VERSION("1.3.0");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/tpm/st33zp24/st33zp24.h b/drivers/char/tpm/st33zp24/st33zp24.h
new file mode 100644
index 0000000000..5acc85f711
--- /dev/null
+++ b/drivers/char/tpm/st33zp24/st33zp24.h
@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * STMicroelectronics TPM Linux driver for TPM ST33ZP24
+ * Copyright (C) 2009 - 2016 STMicroelectronics
+ */
+
+#ifndef __LOCAL_ST33ZP24_H__
+#define __LOCAL_ST33ZP24_H__
+
+#define TPM_ST33_I2C "st33zp24-i2c"
+#define TPM_ST33_SPI "st33zp24-spi"
+
+#define TPM_WRITE_DIRECTION 0x80
+#define ST33ZP24_BUFSIZE 2048
+
+struct st33zp24_dev {
+ struct tpm_chip *chip;
+ void *phy_id;
+ const struct st33zp24_phy_ops *ops;
+ int locality;
+ int irq;
+ u32 intrs;
+ struct gpio_desc *io_lpcpd;
+ wait_queue_head_t read_queue;
+};
+
+
+struct st33zp24_phy_ops {
+ int (*send)(void *phy_id, u8 tpm_register, u8 *tpm_data, int tpm_size);
+ int (*recv)(void *phy_id, u8 tpm_register, u8 *tpm_data, int tpm_size);
+};
+
+#ifdef CONFIG_PM_SLEEP
+int st33zp24_pm_suspend(struct device *dev);
+int st33zp24_pm_resume(struct device *dev);
+#endif
+
+int st33zp24_probe(void *phy_id, const struct st33zp24_phy_ops *ops,
+ struct device *dev, int irq);
+void st33zp24_remove(struct tpm_chip *chip);
+#endif /* __LOCAL_ST33ZP24_H__ */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-09 06:27:50 +0000