[PATCH 1/1] TPM: STMicroelectronics st33 driver SPI
From: Matthias Leblanc
Date: Wed May 15 2013 - 09:57:46 EST
From: Mathias Leblanc <mathias.leblanc@xxxxxx>
* STMicroelectronics version 1.2.0, Copyright (C) 2010
* STMicroelectronics comes with ABSOLUTELY NO WARRANTY.
* This is free software, and you are welcome to redistribute it
* under certain conditions.
This is the driver for TPM chip from ST Microelectronics.
If you have a TPM security chip from STMicroelectronics working with
an SPI, in menuconfig or .config choose the tpm driver on
device --> tpm and activate the protocol of your choice before compiling
the kernel.
The driver will be accessible from within Linux.
Tested on linux x86/x64 and beagleboard REV B & XM REV C
Signed-off-by: Mathias Leblanc <mathias.leblanc@xxxxxx>
---
Remove unused variables
Remove tpm_st33_spi_exit function that cause compilation error
Initalise data and temp variable
Change some variable type
Correction of warnings and errors from smatch tools
drivers/char/tpm/Kconfig | 10 +
drivers/char/tpm/Makefile | 1 +
drivers/char/tpm/tpm_spi_stm_st33.c | 948 +++++++++++++++++++++++++++++++++++
drivers/char/tpm/tpm_spi_stm_st33.h | 61 +++
4 files changed, 1020 insertions(+), 0 deletions(-)
create mode 100644 drivers/char/tpm/tpm_spi_stm_st33.c
create mode 100644 drivers/char/tpm/tpm_spi_stm_st33.h
diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
index dbfd564..2fc1254 100644
--- a/drivers/char/tpm/Kconfig
+++ b/drivers/char/tpm/Kconfig
@@ -91,4 +91,14 @@ config TCG_ST33_I2C
To compile this driver as a module, choose M here; the module will be
called tpm_stm_st33_i2c.
+config TCG_ST33_SPI
+ tristate "STMicroelectronics ST33 SPI"
+ depends on SPI
+ depends on GPIOLIB
+ ---help---
+ If you have a TPM security chip from STMicroelectronics working with
+ an SPI bus say Yes and it will be accessible from within Linux.
+ To compile this driver as a module, choose M here; the module will be
+ called tpm_spi_stm_st33.
+
endif # TCG_TPM
diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile
index a3736c9..a1db3dd 100644
--- a/drivers/char/tpm/Makefile
+++ b/drivers/char/tpm/Makefile
@@ -18,3 +18,4 @@ obj-$(CONFIG_TCG_ATMEL) += tpm_atmel.o
obj-$(CONFIG_TCG_INFINEON) += tpm_infineon.o
obj-$(CONFIG_TCG_IBMVTPM) += tpm_ibmvtpm.o
obj-$(CONFIG_TCG_ST33_I2C) += tpm_i2c_stm_st33.o
+obj-$(CONFIG_TCG_ST33_SPI) += tpm_spi_stm_st33.o
diff --git a/drivers/char/tpm/tpm_spi_stm_st33.c b/drivers/char/tpm/tpm_spi_stm_st33.c
new file mode 100644
index 0000000..192ac1c
--- /dev/null
+++ b/drivers/char/tpm/tpm_spi_stm_st33.c
@@ -0,0 +1,948 @@
+/*
+ * STMicroelectronics TPM SPI Linux driver for TPM ST33ZP24
+ * Copyright (C) 2009, 2010 STMicroelectronics
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * STMicroelectronics version 1.2.0, Copyright (C) 2010
+ * STMicroelectronics comes with ABSOLUTELY NO WARRANTY.
+ * This is free software, and you are welcome to redistribute it
+ * under certain conditions.
+ *
+ * @Author: Christophe RICARD tpmsupport@xxxxxx
+ *
+ * @File: tpm_stm_st33_spi.c
+ *
+ * @Synopsis:
+ * 09/15/2010: First shot driver tpm_tis driver for lpc is
+ * used as model.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/spi/spi.h>
+#include <linux/wait.h>
+#include <linux/string.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/sysfs.h>
+#include <linux/gpio.h>
+#include <linux/uaccess.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+
+#include "tpm.h"
+
+#include "tpm_spi_stm_st33.h"
+
+enum stm33zp24_access {
+ TPM_ACCESS_VALID = 0x80,
+ TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
+ TPM_ACCESS_REQUEST_PENDING = 0x04,
+ TPM_ACCESS_REQUEST_USE = 0x02,
+};
+
+enum stm33zp24_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 stm33zp24_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_LOC4SOFTRELEASE_INT = 0x008,
+ 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, /* ms */
+ TIS_LONG_TIMEOUT = 2000, /* 2 sec */
+};
+
+static inline int spi_read_write(struct spi_device *spi,
+ struct spi_transfer xfer) {
+ struct spi_message msg;
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfer, &msg);
+ return spi_sync(spi, &msg);
+}
+
+/*
+ * spi_write8_reg
+ * Send byte to the TIS register according to the ST33ZP24 SPI protocol.
+ * @param: tpm, the chip 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 spi_write8_reg(struct tpm_chip *tpm, u8 tpm_register,
+ u8 *tpm_data, u16 tpm_size)
+{
+ u8 data = 0;
+ int total_length = 0, nbr_dummy_bytes;
+ int value = 0;
+ struct spi_device *dev = (struct spi_device *)tpm->vendor.iobase;
+ struct st33zp24_platform_data *platform_data = dev->dev.platform_data;
+ u8 *data_buffer = platform_data->tpm_spi_buffer[0];
+ struct spi_transfer xfer = {
+ .tx_buf = data_buffer,
+ .rx_buf = platform_data->tpm_spi_buffer[1],
+ };
+
+ u8 latency = platform_data->latency + tpm_size + 1;
+
+ /* Pre-Header */
+ data = TPM_WRITE_DIRECTION | tpm->vendor.locality;
+ memcpy(data_buffer + total_length, &data, sizeof(data));
+ total_length++;
+ data = tpm_register;
+ memcpy(data_buffer + total_length, &data, sizeof(data));
+ total_length++;
+
+ if (tpm_size > 0 &&
+ (tpm_register == TPM_DATA_FIFO || tpm_register == TPM_HASH_DATA)) {
+ data = (tpm_size >> 8) & 0x00ff;
+ data_buffer[total_length++] = data;
+ data = tpm_size & 0x00ff;
+ data_buffer[total_length++] = data;
+ latency -= 2;
+ }
+
+ memcpy(&data_buffer[total_length], tpm_data, tpm_size);
+ total_length += tpm_size;
+
+ nbr_dummy_bytes = platform_data->latency + 1;
+ memset(&data_buffer[total_length], TPM_DUMMY_BYTE,
+ platform_data->latency + 1);
+
+ xfer.len = total_length;
+
+ value = spi_read_write(dev, xfer);
+
+ if (value == 0) {
+ nbr_dummy_bytes = total_length - 1 - nbr_dummy_bytes;
+ while (nbr_dummy_bytes < total_length &&
+ ((u8 *)xfer.rx_buf)[nbr_dummy_bytes] == 0)
+ nbr_dummy_bytes++;
+
+ if (((u8 *)xfer.rx_buf)[nbr_dummy_bytes] != 0)
+ value = ((u8 *)xfer.rx_buf)[nbr_dummy_bytes];
+ }
+
+ return value;
+} /* spi_write8_reg() */
+
+/*
+ * spi_read8_reg
+ * Recv byte from the TIS register according to the ST33ZP24 SPI protocol.
+ * @param: tpm, the chip 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 u8 spi_read8_reg(struct tpm_chip *tpm, u8 tpm_register,
+ u8 *tpm_data, u16 tpm_size)
+{
+ u8 data = 0;
+ int total_length = 0, nbr_dummy_bytes;
+ int value = 0;
+ struct spi_device *dev = (struct spi_device *)tpm->vendor.iobase;
+ struct st33zp24_platform_data *platform_data = dev->dev.platform_data;
+ u8 *data_buffer = platform_data->tpm_spi_buffer[0];
+ struct spi_transfer xfer = {
+ .tx_buf = data_buffer,
+ .rx_buf = platform_data->tpm_spi_buffer[1],
+ };
+
+ /* Pre-Header */
+
+ data = tpm->vendor.locality;
+ memcpy(data_buffer + total_length, &data, sizeof(data));
+ total_length++;
+ data = tpm_register;
+ memcpy(data_buffer + total_length, &data, sizeof(data));
+ total_length++;
+
+ nbr_dummy_bytes = platform_data->latency + 1;
+ memset(&data_buffer[total_length], TPM_DUMMY_BYTE,
+ platform_data->latency + 1);
+
+ xfer.len = total_length;
+
+ /* header + status byte + size of the data + status byte */
+ value = spi_read_write(dev, xfer);
+
+ if (tpm_size > 0 && value == 0) {
+ nbr_dummy_bytes = 2;
+ for (; nbr_dummy_bytes < total_length &&
+ ((u8 *)xfer.rx_buf)[nbr_dummy_bytes] == 0;
+ nbr_dummy_bytes++)
+ ;
+
+ if (nbr_dummy_bytes + 1 < total_length) {
+ value = ((u8 *)xfer.rx_buf)[nbr_dummy_bytes];
+
+ if (tpm_size > 0)
+ memcpy(tpm_data, xfer.rx_buf +
+ nbr_dummy_bytes + 1,
+ tpm_size);
+ }
+ }
+ return value;
+} /* spi_read8_reg() */
+
+/*
+ * clear_interruption
+ * clear the TPM interrupt register.
+ * @param: tpm, the chip description
+ */
+static void clear_interruption(struct tpm_chip *tpm)
+{
+ u8 interrupt;
+ spi_read8_reg(tpm, TPM_INT_STATUS, &interrupt, 1);
+ /* Clear interrupts handled with TPM_EOI */
+ spi_write8_reg(tpm, TPM_INT_STATUS, &interrupt, 1);
+ spi_read8_reg(tpm, TPM_INT_STATUS, &interrupt, 1);
+} /* clear_interruption() */
+
+/*
+ * _wait_for_serirq_timeout
+ * @param: tpm, the chip description
+ * @param: timeout, the timeout of the interrupt
+ * @return: the status of the interruption.
+ */
+unsigned long wait_for_serirq_timeout(struct tpm_chip *chip, bool condition,
+ unsigned long timeout)
+{
+ long status = 0;
+ struct spi_device *client;
+ struct st33zp24_platform_data *pin_infos;
+
+ client = (struct spi_device *)chip->vendor.iobase;
+ pin_infos = client->dev.platform_data;
+
+ status = wait_for_completion_interruptible_timeout(
+ &pin_infos->irq_detection, timeout);
+ if (status > 0)
+ enable_irq(gpio_to_irq(pin_infos->io_serirq));
+ gpio_direction_input(pin_infos->io_serirq);
+
+ if (!status) {
+ status = -EBUSY;
+ goto wait_end;
+ }
+ clear_interruption(chip);
+ if (condition)
+ status = 1;
+
+wait_end:
+ return status;
+}
+
+
+/*
+ * tpm_stm_spi_cancel, cancel is not implemented.
+ * @param: chip, the tpm chip description as specified in
+ * driver/char/tpm/tpm.h.
+ */
+static void tpm_stm_spi_cancel(struct tpm_chip *chip)
+{
+ u8 data = TPM_STS_COMMAND_READY;
+
+ /* this causes the current command to be aborted */
+ spi_write8_reg(chip, TPM_STS, &data, 1);
+} /* tpm_stm_spi_cancel() */
+
+/*
+ * tpm_stm_spi_status return the TPM_STS register
+ * @param: chip, the tpm chip description
+ * @return: the TPM_STS register value.
+ */
+static u8 tpm_stm_spi_status(struct tpm_chip *chip)
+{
+ u8 data = 0;
+
+ spi_read8_reg(chip, TPM_STS, &data, 1);
+ return data;
+} /* tpm_stm_spi_status() */
+
+
+
+/*
+ * check_locality if the locality is active
+ * @param: chip, the tpm chip description
+ * @return: the active locality or -EACCESS.
+ */
+static int check_locality(struct tpm_chip *chip)
+{
+ u8 data = 0;
+ u8 status;
+
+ status = spi_read8_reg(chip, TPM_ACCESS, &data, 1);
+ if (status && (data &
+ (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
+ (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
+ return chip->vendor.locality;
+
+ return -EACCES;
+} /* check_locality() */
+
+/*
+ * request_locality request the TPM locality
+ * @param: chip, the chip description
+ * @return: the active locality or EACCESS.
+ */
+static int request_locality(struct tpm_chip *chip)
+{
+ unsigned long stop;
+ long rc;
+ u8 data = 0;
+
+ /* Check locality */
+ if (check_locality(chip) == chip->vendor.locality)
+ return chip->vendor.locality;
+
+ /* Request locality */
+ data = TPM_ACCESS_REQUEST_USE;
+ rc = spi_write8_reg(chip, TPM_ACCESS, &data, 1);
+ if (rc < 0)
+ goto end;
+
+ /* wait for burstcount */
+ if (chip->vendor.irq) {
+ rc = wait_for_serirq_timeout(chip, (check_locality
+ (chip) >= 0),
+ chip->vendor.timeout_a);
+ if (rc > 0)
+ return chip->vendor.locality;
+ } else {
+ stop = jiffies + chip->vendor.timeout_a;
+ do {
+ if (check_locality(chip) >= 0)
+ return chip->vendor.locality;
+ msleep(TPM_TIMEOUT);
+ } while (time_before(jiffies, stop));
+ }
+end:
+ return -EACCES;
+} /* request_locality() */
+
+/*
+ * release_locality release the active locality
+ * @param: chip, the tpm chip description.
+ */
+static void release_locality(struct tpm_chip *chip)
+{
+ u8 data = 0;
+
+ data = TPM_ACCESS_ACTIVE_LOCALITY;
+ spi_write8_reg(chip, TPM_ACCESS, &data, 1);
+} /* release_locality()*/
+
+/*
+ * get_burstcount return the burstcount address 0x19 0x1A
+ * @param: chip, the chip description
+ * return: the burstcount.
+ */
+static int get_burstcount(struct tpm_chip *chip)
+{
+ unsigned long stop;
+ u32 burstcnt;
+ u8 tpm_reg, temp = 0;
+ long status = 0;
+
+ /* wait for burstcount */
+ /* which timeout value, spec has 2 answers (c & d) */
+ stop = jiffies + chip->vendor.timeout_d;
+ do {
+ tpm_reg = TPM_STS + 1;
+ status = spi_read8_reg(chip, tpm_reg, &temp, 1);
+ if (status < 0)
+ goto end;
+
+ tpm_reg = tpm_reg + 1;
+ burstcnt = temp;
+ status = spi_read8_reg(chip, tpm_reg, &temp, 1);
+ if (status < 0)
+ goto end;
+
+ burstcnt |= temp << 8;
+ if (burstcnt)
+ return burstcnt;
+ msleep(TPM_TIMEOUT);
+ } while (time_before(jiffies, stop));
+
+end:
+ return -EBUSY;
+} /* get_burstcount() */
+
+/*
+ * wait_for_stat wait for a TPM_STS value
+ * @param: chip, the tpm chip description
+ * @param: mask, the value mask to wait
+ * @param: timeout, the timeout
+ * @param: queue, the wait queue.
+ * @return: the tpm status, 0 if success, -ETIME if timeout is reached.
+ */
+static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
+ wait_queue_head_t *queue)
+{
+ unsigned long stop;
+ long rc;
+ u8 status;
+
+ /* check current status */
+ status = tpm_stm_spi_status(chip);
+ if (!chip->vendor.irq && (status & mask) == mask)
+ return 0;
+
+ if (chip->vendor.irq) {
+ rc = wait_for_serirq_timeout(chip, ((tpm_stm_spi_status
+ (chip) & mask) ==
+ mask), timeout);
+ if (rc > 0)
+ return 0;
+ } else {
+ stop = jiffies + timeout;
+ do {
+ msleep(TPM_TIMEOUT);
+ status = tpm_stm_spi_status(chip);
+ if ((status & mask) == mask)
+ return 0;
+ } while (time_before(jiffies, stop));
+ }
+ return -ETIME;
+} /* wait_for_stat() */
+
+/*
+ * recv_data receive data
+ * @param: chip, the tpm chip description
+ * @param: buf, the buffer where the data are received
+ * @param: count, the number of data to receive
+ * @return: the tpm status, 0 if success, -ETIME if timeout is reached.
+ */
+static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
+{
+ u32 size = 0, burstcnt, len;
+ long status = 0;
+
+ while (size < count &&
+ wait_for_stat(chip,
+ TPM_STS_DATA_AVAIL | TPM_STS_VALID,
+ chip->vendor.timeout_c,
+ &chip->vendor.read_queue)
+ == 0) {
+ burstcnt = get_burstcount(chip);
+ len = min_t(int, burstcnt, count - size);
+ status = spi_read8_reg(chip, TPM_DATA_FIFO, buf + size, len);
+ if (status < 0)
+ return status;
+
+
+ size += len;
+ }
+ return size;
+}
+
+/*
+ * tpm_ioserirq_handler the serirq irq handler
+ * @param: irq, the tpm chip description
+ * @param: dev_id, the description of the chip
+ * @return: the status of the handler.
+ */
+static irqreturn_t tpm_ioserirq_handler(int irq, void *dev_id)
+{
+ struct tpm_chip *chip = dev_id;
+ struct spi_device *client;
+ struct st33zp24_platform_data *pin_infos;
+
+ disable_irq_nosync(irq);
+
+ client = (struct spi_device *)chip->vendor.iobase;
+ pin_infos = client->dev.platform_data;
+
+ complete(&pin_infos->irq_detection);
+ return IRQ_HANDLED;
+} /* tpm_ioserirq_handler() */
+
+/*
+ * tpm_stm_spi_send send TPM commands through the SPI bus.
+ * @param: chip, the tpm chip description
+ * @param: buf, the tpm command buffer
+ * @param: len, the tpm command size
+ * @return: should be zero if success else the negative error code.
+ */
+static int tpm_stm_spi_send(struct tpm_chip *chip, unsigned char *buf,
+ size_t len)
+{
+ u32 burstcnt = 0, i, size = 0;
+ u8 data = 0;
+ long status = 0, ret = 0;
+
+ if (chip == NULL)
+ return -EBUSY;
+ if (len < TPM_HEADER_SIZE)
+ return -EBUSY;
+
+ ret = request_locality(chip);
+ if (ret < 0)
+ return ret;
+
+ status = tpm_stm_spi_status(chip);
+ if ((status & TPM_STS_COMMAND_READY) == 0) {
+ tpm_stm_spi_cancel(chip);
+ if (wait_for_stat
+ (chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
+ &chip->vendor.int_queue) < 0) {
+ ret = -ETIME;
+ goto out_err;
+ }
+ }
+
+ for (i = 0; i < len - 1;) {
+ burstcnt = get_burstcount(chip);
+ size = min_t(int, len - i - 1, burstcnt);
+ ret = spi_write8_reg(chip, TPM_DATA_FIFO, buf, size);
+ if (ret < 0)
+ goto out_err;
+ i += size;
+ }
+
+ status = tpm_stm_spi_status(chip);
+ if ((status & TPM_STS_DATA_EXPECT) == 0) {
+ ret = -EIO;
+ goto out_err;
+ }
+
+ /* write last byte */
+ spi_write8_reg(chip, TPM_DATA_FIFO, buf + len - 1, 1);
+
+ status = tpm_stm_spi_status(chip);
+ if ((status & TPM_STS_DATA_EXPECT) != 0) {
+ ret = -EIO;
+ goto out_err;
+ }
+
+ /* go and do it */
+ data = TPM_STS_GO;
+ ret = spi_write8_reg(chip, TPM_STS, &data, 1);
+ if (ret < 0)
+ goto out_err;
+
+ return len;
+out_err:
+ tpm_stm_spi_cancel(chip);
+ release_locality(chip);
+ return ret;
+}
+
+/*
+ * tpm_stm_spi_recv received TPM response through the SPI bus.
+ * @param: chip, the tpm chip description
+ * @param: buf, the tpm command buffer
+ * @param: len, the tpm command size
+* @return: should be zero if success else the negative error code.
+ */
+static int tpm_stm_spi_recv(struct tpm_chip *chip, unsigned char *buf,
+ size_t count)
+{
+ int size = 0;
+ int expected;
+
+ if (chip == NULL)
+ return -EBUSY;
+ 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) {
+ 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;
+ }
+
+out:
+ chip->vendor.cancel(chip);
+ release_locality(chip);
+ return size;
+}
+
+
+static const struct file_operations tpm_st33_spi_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .read = tpm_read,
+ .write = tpm_write,
+ .open = tpm_open,
+ .release = tpm_release,
+};
+
+static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
+static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
+static DEVICE_ATTR(enabled, S_IRUGO, tpm_show_enabled, NULL);
+static DEVICE_ATTR(active, S_IRUGO, tpm_show_active, NULL);
+static DEVICE_ATTR(owned, S_IRUGO, tpm_show_owned, NULL);
+static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated, NULL);
+static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps_1_2, NULL);
+static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
+
+static struct attribute *stm_tpm_attrs[] = {
+ &dev_attr_pubek.attr,
+ &dev_attr_pcrs.attr,
+ &dev_attr_enabled.attr,
+ &dev_attr_active.attr,
+ &dev_attr_owned.attr,
+ &dev_attr_temp_deactivated.attr,
+ &dev_attr_caps.attr,
+ &dev_attr_cancel.attr, NULL,
+};
+
+static struct attribute_group stm_tpm_attr_grp = {
+ .attrs = stm_tpm_attrs
+};
+
+static struct tpm_vendor_specific st_spi_tpm = {
+ .send = tpm_stm_spi_send,
+ .recv = tpm_stm_spi_recv,
+ .cancel = tpm_stm_spi_cancel,
+ .status = tpm_stm_spi_status,
+ .attr_group = &stm_tpm_attr_grp,
+ .miscdev = {.fops = &tpm_st33_spi_fops,},
+};
+
+static int evaluate_latency(struct tpm_chip *chip)
+{
+ int latency = 0;
+ struct spi_device *dev = (struct spi_device *)chip->vendor.iobase;
+ struct st33zp24_platform_data *platform_data = dev->dev.platform_data;
+ int status = 0;
+ u8 data = 0;
+
+ for (; status == 0x00 && latency < MAX_SPI_LATENCY; latency++) {
+ platform_data->latency = latency;
+ status = spi_read8_reg(chip, TPM_INTF_CAPABILITY, &data, 1);
+ }
+ return latency - 1;
+} /* evaluate_latency() */
+
+static int interrupts;
+module_param(interrupts, int, 0444);
+MODULE_PARM_DESC(interrupts, "Enable interrupts");
+
+static int power_mgt = 1;
+module_param(power_mgt, int, 0444);
+MODULE_PARM_DESC(power_mgt, "Power Management");
+
+/*
+ * tpm_st33_spi_probe initialize the TPM device
+ * @param: client, the spi_device drescription (TPM SPI description).
+ * @param: id, the spi_device_id struct.
+ * @return: 0 in case of success.
+ * -1 in other case.
+ */
+static int
+tpm_st33_spi_probe(struct spi_device *dev)
+{
+ long err = 0;
+ u8 intmask;
+ struct tpm_chip *chip;
+ struct st33zp24_platform_data *platform_data;
+
+ /* Check SPI platform functionnalities */
+ if (dev == NULL) {
+ pr_info("dev is NULL. exiting.\n");
+ err = -ENODEV;
+ goto end;
+ }
+
+ chip = tpm_register_hardware(&dev->dev, &st_spi_tpm);
+ if (!chip) {
+ err = -ENODEV;
+ goto end;
+ }
+
+ /* Allocation of SPI buffers MISO and MOSI */
+ /* Size is as follow: */
+ /* Request burstcount value = 0x800 = 2048 */
+ /* + */
+ /* Response burstcount value = 0x400 = 1024 */
+ /* + */
+ /* At least: */
+ /* 1 byte for direction/locality */
+ /* 1 byte tpm tis register */
+ /* 2 bytes spi data length (for request only) */
+ /* 2 latency bytes */
+ /* 1 status byte */
+ /* = 2048 + 1024 + 7 */
+ /* We reserved 2048 + 1024 + 20 in case latency byte */
+ /* change */
+ platform_data = dev->dev.platform_data;
+
+ if (platform_data)
+ platform_data->tpm_spi_buffer[0] =
+ kmalloc((TPM_BUFSIZE + (TPM_BUFSIZE / 2) +
+ TPM_DIGEST_SIZE) * sizeof(u8), GFP_KERNEL);
+ else
+ goto end;
+
+ if (platform_data->tpm_spi_buffer[0] == NULL) {
+ err = -ENOMEM;
+ goto _tpm_clean_answer;
+ }
+
+ platform_data->tpm_spi_buffer[1] =
+ kmalloc((TPM_BUFSIZE + (TPM_BUFSIZE / 2) +
+ TPM_DIGEST_SIZE) * sizeof(u8) , GFP_KERNEL);
+
+ if (platform_data->tpm_spi_buffer[1] == NULL) {
+ err = -ENOMEM;
+ goto _tpm_clean_response;
+ }
+
+ chip->vendor.iobase = dev;
+
+ /* Default timeouts */
+ chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
+ chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
+ chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
+ chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
+ chip->vendor.locality = LOCALITY0;
+
+ if (power_mgt) {
+ err = gpio_request(platform_data->io_lpcpd, "TPM IO_LPCPD");
+ if (err)
+ goto _gpio_init1;
+ gpio_set_value(platform_data->io_lpcpd, 1);
+ }
+
+ platform_data->latency = evaluate_latency(chip);
+ if (platform_data->latency <= 0x00) {
+ err = -ENODEV;
+ goto _gpio_init1;
+ }
+
+ /* Enable interrupt */
+ /* Register GPIO pin through generic Linux GPIO API */
+ if (interrupts) {
+ init_completion(&platform_data->irq_detection);
+ if (request_locality(chip) != LOCALITY0) {
+ err = -ENODEV;
+ goto _tpm_clean_response;
+ }
+ err = gpio_request(platform_data->io_serirq, "TPM IO_SERIRQ");
+ if (err)
+ goto _gpio_init2;
+
+ /* Clear all existing */
+ clear_interruption(chip);
+ err = request_irq(gpio_to_irq(platform_data->io_serirq),
+ &tpm_ioserirq_handler,
+ IRQF_TRIGGER_HIGH | IRQF_SHARED,
+ "TPM SERIRQ management", chip);
+ if (err < 0) {
+ pr_info("TPM SERIRQ signals %d not available\n",
+ gpio_to_irq(platform_data->io_serirq));
+ goto _irq_set;
+ }
+ err = spi_read8_reg(chip, TPM_INT_ENABLE, &intmask, 1);
+ if (err < 0)
+ goto _irq_set;
+
+ intmask |= TPM_INTF_CMD_READY_INT
+ | TPM_INTF_FIFO_AVALAIBLE_INT
+ | TPM_INTF_WAKE_UP_READY_INT
+ | TPM_INTF_LOC4SOFTRELEASE_INT
+ | TPM_INTF_LOCALITY_CHANGE_INT
+ | TPM_INTF_STS_VALID_INT
+ | TPM_INTF_DATA_AVAIL_INT;
+
+ err = spi_write8_reg(chip, TPM_INT_ENABLE, &intmask, 1);
+ if (err < 0)
+ goto _irq_set;
+
+ intmask = TPM_GLOBAL_INT_ENABLE;
+ err = spi_write8_reg(chip, TPM_INT_ENABLE + 3, &intmask, 1);
+ if (err < 0)
+ goto _irq_set;
+
+ err = spi_read8_reg(chip, TPM_INT_STATUS, &intmask, 1);
+ if (err < 0)
+ goto _irq_set;
+
+ chip->vendor.irq = interrupts;
+
+ tpm_gen_interrupt(chip);
+ }
+
+ tpm_get_timeouts(chip);
+
+ /* attach chip datas to client */
+ spi_set_drvdata(dev, chip);
+ platform_data->bchipf = false;
+
+ pr_info("TPM SPI Initialized\n");
+ return 0;
+_irq_set:
+ free_irq(gpio_to_irq(platform_data->io_serirq), chip);
+_gpio_init2:
+ if (platform_data && interrupts)
+ gpio_free(platform_data->io_serirq);
+_gpio_init1:
+ if (platform_data && power_mgt)
+ gpio_free(platform_data->io_lpcpd);
+_tpm_clean_response:
+ tpm_remove_hardware(chip->dev);
+ if (platform_data->tpm_spi_buffer[1] != NULL) {
+ kfree(platform_data->tpm_spi_buffer[1]);
+ platform_data->tpm_spi_buffer[1] = NULL;
+ }
+_tpm_clean_answer:
+ if (platform_data->tpm_spi_buffer[0] != NULL) {
+ kfree(platform_data->tpm_spi_buffer[0]);
+ platform_data->tpm_spi_buffer[0] = NULL;
+ }
+
+ platform_data->bchipf = true;
+end:
+ pr_info("TPM SPI initialisation fail\n");
+ return err;
+}
+
+/*
+ * tpm_st33_spi_remove remove the TPM device
+ * @param: client, the spi_device drescription (TPM SPI description).
+ clear_bit(0, &chip->is_open);
+ * @return: 0 in case of success.
+ */
+static int tpm_st33_spi_remove(struct spi_device *client)
+{
+ struct tpm_chip *chip = (struct tpm_chip *)spi_get_drvdata(client);
+ struct st33zp24_platform_data *pin_infos =
+ ((struct spi_device *)chip->vendor.iobase)->dev.platform_data;
+
+ if (pin_infos != NULL) {
+ gpio_free(pin_infos->io_lpcpd);
+
+ /* Check if chip has been previously clean */
+ if (pin_infos->bchipf != true)
+ tpm_remove_hardware(chip->dev);
+ if (pin_infos->tpm_spi_buffer[1] != NULL) {
+ kfree(pin_infos->tpm_spi_buffer[1]);
+ pin_infos->tpm_spi_buffer[1] = NULL;
+ }
+ if (pin_infos->tpm_spi_buffer[0] != NULL) {
+ kfree(pin_infos->tpm_spi_buffer[0]);
+ pin_infos->tpm_spi_buffer[0] = NULL;
+ }
+ }
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+/*
+ * tpm_st33_spi_pm_suspend suspend the TPM device
+ * Added: Work around when suspend and no tpm application is running, suspend
+ * may fail because chip->data_buffer is not set (only set in tpm_open in Linux
+ * TPM core)
+ * @return: 0 in case of success.
+ */
+static int tpm_st33_spi_pm_suspend(struct device *dev)
+{
+ struct tpm_chip *chip = dev_get_drvdata(dev);
+ struct st33zp24_platform_data *pin_infos = dev->platform_data;
+ int ret = 0;
+
+ if (power_mgt) {
+ gpio_set_value(pin_infos->io_lpcpd, 0);
+ } else {
+ if (chip->data_buffer == NULL)
+ chip->data_buffer = pin_infos->tpm_spi_buffer[0];
+ ret = tpm_pm_suspend(dev);
+ }
+ return ret;
+} /* tpm_st33_spi_suspend() */
+
+/*
+ * tpm_st33_spi_pm_resume resume the TPM device
+ * @param: spi, the spi_device drescription (TPM SPI description).
+ * @return: 0 in case of success.
+ */
+static int tpm_st33_spi_pm_resume(struct device *dev)
+{
+ struct tpm_chip *chip = dev_get_drvdata(dev);
+ struct st33zp24_platform_data *pin_infos = dev->platform_data;
+
+ int ret = 0;
+ if (power_mgt) {
+ gpio_set_value(pin_infos->io_lpcpd, 1);
+ ret = wait_for_serirq_timeout(chip,
+ (chip->vendor.status(chip) &
+ TPM_STS_VALID) == TPM_STS_VALID,
+ chip->vendor.timeout_b);
+ } else {
+ if (chip->data_buffer == NULL)
+ chip->data_buffer = pin_infos->tpm_spi_buffer[0];
+ ret = tpm_pm_resume(dev);
+ if (!ret)
+ tpm_do_selftest(chip);
+ }
+ return ret;
+} /* tpm_st33_spi_pm_resume() */
+#endif
+
+static SIMPLE_DEV_PM_OPS(tpm_st33_spi_ops, tpm_st33_spi_pm_suspend,
+ tpm_st33_spi_pm_resume);
+static struct spi_driver tpm_st33_spi_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = TPM_ST33_SPI,
+ .pm = &tpm_st33_spi_ops,
+ },
+ .probe = tpm_st33_spi_probe,
+ .remove = tpm_st33_spi_remove,
+};
+
+module_spi_driver(tpm_st33_spi_driver);
+
+MODULE_AUTHOR("Christophe Ricard (tpmsupport@xxxxxx)");
+MODULE_DESCRIPTION("STM TPM SPI ST33 Driver");
+MODULE_VERSION("1.2.0");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/tpm/tpm_spi_stm_st33.h b/drivers/char/tpm/tpm_spi_stm_st33.h
new file mode 100644
index 0000000..4ae5ba6
--- /dev/null
+++ b/drivers/char/tpm/tpm_spi_stm_st33.h
@@ -0,0 +1,61 @@
+/*
+ * STMicroelectronics TPM SPI Linux driver for TPM ST33NP18
+ * Copyright (C) 2009, 2010 STMicroelectronics
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * STMicroelectronics version 1.2.0, Copyright (C) 2010
+ * STMicroelectronics comes with ABSOLUTELY NO WARRANTY.
+ * This is free software, and you are welcome to redistribute it
+ * under certain conditions.
+ *
+ * @Author: Christophe RICARD tpmsupport@xxxxxx
+ *
+ * @File: tpm_spi_stm_st33.h
+ *
+ * @Date: 09/15/2010
+ */
+#ifndef __STM_ST33_TPM_SPI_MAIN_H__
+#define __STM_ST33_TPM_SPI_MAIN_H__
+
+#define TPM_ACCESS (0x0)
+#define TPM_STS (0x18)
+#define TPM_DATA_FIFO (0x24)
+#define TPM_HASH_DATA (0x24)
+#define TPM_INTF_CAPABILITY (0x14)
+#define TPM_INT_STATUS (0x10)
+#define TPM_INT_ENABLE (0x08)
+
+#define TPM_DUMMY_BYTE 0x00
+#define TPM_WRITE_DIRECTION 0x80
+#define TPM_HEADER_SIZE 10
+#define TPM_BUFSIZE 2048
+
+#define LOCALITY0 0
+
+#define MAX_SPI_LATENCY 15
+
+#define TPM_ST33_SPI "st33zp24_spi"
+
+struct st33zp24_platform_data {
+ int io_serirq;
+ int io_lpcpd;
+ int latency;
+ bool bchipf;
+ u8 *tpm_spi_buffer[2]; /* 0 Request 1 Response */
+ struct completion irq_detection;
+};
+
+#endif /* __STM_ST33_TPM_SPI_MAIN_H__ */
--
1.7.9.5
--
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