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Message-Id: <1352290509-14834-1-git-send-email-mathias.leblanc@st.com>
Date: Wed, 7 Nov 2012 13:15:09 +0100
From: Mathias Leblanc <mathias.leblanc@...com>
To: Kent Yoder <key@...ux.vnet.ibm.com>,
Rajiv Andrade <mail@...jiv.net>,
Marcel Selhorst <tpmdd@...horst.net>,
Sirrix AG <tpmdd@...rix.com>, tpmdd-devel@...ts.sourceforge.net
Cc: linux-kernel@...r.kernel.org,
Jean-Luc Blanc <jean-luc.blanc@...com>,
Mathias Leblanc <mathias.leblanc@...com>
Subject: [PATCH 1/1] TPM: STMicroelectronics ST33 I2C
* 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 I2C, 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, beagleboard REV B & XM REV C and CHROMIUM OS
Signed-off-by: Mathias Leblanc <mathias.leblanc@...com>
---
drivers/char/tpm/tpm_stm_st33_i2c.c | 1087 ++++++++++++++++++++++++++++++++++
drivers/char/tpm/tpm_stm_st33_i2c.h | 91 +++
include/linux/i2c/tpm_stm_st33_i2c.h | 48 ++
3 files changed, 1226 insertions(+)
create mode 100644 drivers/char/tpm/tpm_stm_st33_i2c.c
create mode 100644 drivers/char/tpm/tpm_stm_st33_i2c.h
create mode 100644 include/linux/i2c/tpm_stm_st33_i2c.h
diff --git a/drivers/char/tpm/tpm_stm_st33_i2c.c b/drivers/char/tpm/tpm_stm_st33_i2c.c
new file mode 100644
index 0000000..e6e74be
--- /dev/null
+++ b/drivers/char/tpm/tpm_stm_st33_i2c.c
@@ -0,0 +1,1087 @@
+/*
+ * STMicroelectronics TPM I2C 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@...com
+ *
+ * @File: tpm_stm_st33_i2c.c
+ *
+ * @Synopsis:
+ * 09/15/2010: First shot driver tpm_tis driver for lpc is used as model.
+ */
+
+
+#include "tpm_stm_st33_i2c.h"
+
+#include <linux/i2c/tpm_stm_st33_i2c.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,
+ TIS_LONG_TIMEOUT = 2000,
+};
+
+/*
+ * 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: number of byte written successfully: should be one if success.
+ */
+static int write8_reg(struct i2c_client *client, u8 tpm_register,
+ u8 *tpm_data, u16 tpm_size)
+{
+ u8 data;
+ int value = 0;
+ struct st33zp24_platform_data *pin_infos;
+
+ pin_infos = client->dev.platform_data;
+
+ data = tpm_register;
+ memcpy(pin_infos->tpm_i2c_buffer[0], &data, sizeof(data));
+ memcpy(pin_infos->tpm_i2c_buffer[0] + 1, tpm_data, tpm_size);
+ value = i2c_master_send(client, pin_infos->tpm_i2c_buffer[0],
+ tpm_size + 1);
+ return value;
+} /* 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(struct i2c_client *client, u8 tpm_register,
+ u8 *tpm_data, int tpm_size)
+{
+ u8 status = 0;
+ u8 data;
+ struct st33zp24_platform_data *pin_infos;
+
+ pin_infos = client->dev.platform_data;
+
+ data = TPM_DUMMY_BYTE;
+ status = write8_reg(client, tpm_register, &data, 1);
+ if (status == 2)
+ status = i2c_master_recv(client, tpm_data, tpm_size);
+ return status;
+} /* read8_reg() */
+
+/*
+ * I2C_WRITE_DATA
+ * Send byte to the TIS register according to the ST33ZP24 I2C 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: number of byte written successfully: should be one if success.
+ */
+static int I2C_WRITE_DATA(struct i2c_client *client, u8 tpm_register,
+ u8 *tpm_data, u16 tpm_size)
+{
+ u8 value = 0;
+ value = write8_reg(client, tpm_register | TPM_WRITE_DIRECTION,
+ tpm_data, tpm_size);
+
+ return value;
+} /* I2C_WRITE_DATA() */
+
+/*
+ * I2C_READ_DATA
+ * Recv byte from the TIS register according to the ST33ZP24 I2C 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: number of byte read successfully: should be one if success.
+ */
+static int I2C_READ_DATA(struct i2c_client *client, u8 tpm_register,
+ u8 *tpm_data, u16 tpm_size)
+{
+ u8 value = 0;
+
+ value = read8_reg(client, tpm_register, tpm_data, tpm_size);
+
+ return value;
+} /* I2C_READ_DATA () */
+
+/*
+ * clear_interruption
+ * clear the TPM interrupt register.
+ * @param: tpm, the chip description
+ */
+static void clear_interruption(struct i2c_client *client)
+{
+ u8 interrupt;
+ I2C_READ_DATA(client, TPM_INT_STATUS, &interrupt, 1);
+ I2C_WRITE_DATA(client, TPM_INT_STATUS, &interrupt, 1);
+ I2C_READ_DATA(client, TPM_INT_STATUS, &interrupt, 1);
+} /* clear_interruption() */
+
+/*
+ * _wait_for_interrupt_serirq_timeout
+ * @param: tpm, the chip description
+ * @param: timeout, the timeout of the interrupt
+ * @return: the status of the interruption.
+ */
+static int _wait_for_interrupt_serirq_timeout(struct tpm_chip *chip,
+ unsigned long timeout)
+{
+ unsigned long status;
+ struct i2c_client *client;
+ struct st33zp24_platform_data *pin_infos;
+
+ client = (struct i2c_client *) 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);
+
+ return status;
+} /* wait_for_interrupt_serirq_timeout() */
+
+#define wait_for_serirq_timeout(chip, condition, timeout) \
+({ \
+ unsigned long status = 2; \
+ struct i2c_client *client; \
+ struct st33zp24_platform_data *pin_infos; \
+\
+ client = (struct i2c_client *) chip->vendor.iobase; \
+ pin_infos = client->dev.platform_data; \
+\
+ status = _wait_for_interrupt_serirq_timeout(chip, timeout); \
+ if (!status) { \
+ status = -EBUSY; \
+ goto wait_end; \
+ } \
+ clear_interruption(client); \
+ if (condition) \
+ status = 1; \
+\
+wait_end: \
+ status;\
+})
+
+/*
+ * tpm_stm_i2c_cancel, cancel is not implemented.
+ * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h
+ */
+static void tpm_stm_i2c_cancel(struct tpm_chip *chip)
+{
+ struct i2c_client *client;
+ u8 data;
+
+ client = (struct i2c_client *) chip->vendor.iobase;
+
+ data = TPM_STS_COMMAND_READY;
+ I2C_WRITE_DATA(client, TPM_STS, &data, 1);
+ if (chip->vendor.irq)
+ wait_for_serirq_timeout(chip, 1, chip->vendor.timeout_a);
+} /* tpm_stm_i2c_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_i2c_status(struct tpm_chip *chip)
+{
+ struct i2c_client *client;
+ u8 data;
+ client = (struct i2c_client *) chip->vendor.iobase;
+
+ I2C_READ_DATA(client, TPM_STS, &data, 1);
+ return data;
+} /* tpm_stm_i2c_status() */
+
+/*
+ * responseSize return the command size
+ * @param: buffer, command buffer.
+ * @param: size, the buffer size.
+ * @return: the command size.
+ */
+static int responseSize(const char *buffer, size_t size)
+{
+ size_t val = 0;
+
+ if (size >= TPM_HEADER_SIZE) {
+ val = (size_t) (((unsigned)buffer[2]) << 24
+ | ((unsigned)buffer[3]) << 16
+ | ((unsigned)buffer[4]) << 8 | (unsigned)
+ buffer[5]);
+ }
+
+ if (val < TPM_BUFSIZE)
+ return val;
+ else
+ return TPM_BUFSIZE;
+}
+
+
+/*
+ * 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)
+{
+ struct i2c_client *client;
+ u8 data;
+ u8 status;
+
+ client = (struct i2c_client *) chip->vendor.iobase;
+
+ status = I2C_READ_DATA(client, 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;
+ struct i2c_client *client;
+ u8 data;
+
+ client = (struct i2c_client *) chip->vendor.iobase;
+
+ if (check_locality(chip) == chip->vendor.locality)
+ return chip->vendor.locality;
+
+ data = TPM_ACCESS_REQUEST_USE;
+ rc = I2C_WRITE_DATA(client, TPM_ACCESS, &data, 1);
+ if (rc < 0)
+ goto end;
+
+ 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));
+ }
+ rc = -EACCES;
+end:
+ return rc;
+} /* request_locality() */
+
+/*
+ * release_locality release the active locality
+ * @param: chip, the tpm chip description.
+ */
+static void release_locality(struct tpm_chip *chip)
+{
+ struct i2c_client *client;
+ u8 data;
+
+ client = (struct i2c_client *) chip->vendor.iobase;
+ data = TPM_ACCESS_ACTIVE_LOCALITY;
+
+ I2C_WRITE_DATA(client, TPM_ACCESS, &data, 1);
+}
+
+/*
+ * 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;
+ int burstcnt, status;
+ u8 tpm_reg, temp;
+
+ struct i2c_client *client = (struct i2c_client *) chip->vendor.iobase;
+
+ stop = jiffies + chip->vendor.timeout_d;
+ do {
+ tpm_reg = TPM_STS + 1;
+ status = I2C_READ_DATA(client, tpm_reg, &temp, 1);
+ if (status < 0)
+ goto end;
+
+ tpm_reg = tpm_reg + 1;
+ burstcnt = temp;
+ status = I2C_READ_DATA(client, 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;
+
+ if (chip->vendor.irq) {
+ rc = wait_for_serirq_timeout(chip, ((tpm_stm_i2c_status
+ (chip) & mask) ==
+ mask), timeout);
+ if (rc > 0)
+ return 0;
+ } else{
+ stop = jiffies + timeout;
+ do {
+ msleep(TPM_TIMEOUT);
+ status = tpm_stm_i2c_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)
+{
+ int size = 0, burstcnt, len;
+ struct i2c_client *client;
+
+ client = (struct i2c_client *) chip->vendor.iobase;
+
+ 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);
+ I2C_READ_DATA(client, TPM_DATA_FIFO, buf + size, len);
+ 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 i2c_client *client;
+ struct st33zp24_platform_data *pin_infos;
+
+ disable_irq_nosync(irq);
+
+ client = (struct i2c_client *) chip->vendor.iobase;
+ pin_infos = client->dev.platform_data;
+
+ complete(&pin_infos->irq_detection);
+ return IRQ_HANDLED;
+} /* tpm_ioserirq_handler() */
+
+
+/*
+ * tpm_stm_i2c_send send TPM commands through the I2C bus.
+ *
+ * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h
+ * @param: buf, the buffer to send.
+ * @param: count, the number of bytes to send.
+ * @return: In case of success the number of bytes sent.
+ * In other case, a < 0 value describing the issue.
+ */
+static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
+ size_t len)
+{
+ u32 ret = 0, ordinal,
+ status,
+ burstcnt = 0, i, size;
+ u8 data;
+ struct i2c_client *client;
+ struct st33zp24_platform_data *pin_infos;
+
+ if (chip == NULL)
+ return -EBUSY;
+ if (len < TPM_HEADER_SIZE)
+ return -EBUSY;
+
+ client = (struct i2c_client *)chip->vendor.iobase;
+ pin_infos = client->dev.platform_data;
+
+ ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
+
+ client->flags = 0;
+
+ ret = request_locality(chip);
+ if (ret < 0)
+ return ret;
+
+ status = tpm_stm_i2c_status(chip);
+ if ((status & TPM_STS_COMMAND_READY) == 0) {
+ tpm_stm_i2c_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 = I2C_WRITE_DATA(client, TPM_DATA_FIFO, buf, size);
+ if (ret < 0)
+ goto out_err;
+
+ i += size;
+ }
+
+ status = tpm_stm_i2c_status(chip);
+ if ((status & TPM_STS_DATA_EXPECT) == 0) {
+ ret = -EIO;
+ goto out_err;
+ }
+
+ ret = I2C_WRITE_DATA(client, TPM_DATA_FIFO, buf + len - 1, 1);
+ if (ret < 0)
+ goto out_err;
+
+ status = tpm_stm_i2c_status(chip);
+ if ((status & TPM_STS_DATA_EXPECT) != 0) {
+ ret = -EIO;
+ goto out_err;
+ }
+
+ data = TPM_STS_GO;
+ I2C_WRITE_DATA(client, TPM_STS, &data, 1);
+
+ return len;
+out_err:
+ tpm_stm_i2c_cancel(chip);
+ release_locality(chip);
+ return ret;
+}
+
+/*
+ * tpm_stm_i2c_recv received TPM response through the I2C bus.
+ * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h.
+ * @param: buf, the buffer to store datas.
+ * @param: count, the number of bytes to send.
+ * @return: In case of success the number of bytes received.
+ * In other case, a < 0 value describing the issue.
+ */
+static int tpm_stm_i2c_recv(struct tpm_chip *chip, unsigned char *buf,
+ size_t count)
+{
+ int size = 0;
+ int expected;
+
+ struct i2c_client *client;
+ struct st33zp24_platform_data *pin_infos;
+
+ client = (struct i2c_client *)chip->vendor.iobase;
+ pin_infos = client->dev.platform_data;
+
+
+ if (chip == NULL)
+ 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) {
+ 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;
+}
+
+/*
+ * tpm_stm_i2c_send_hash send TPM locality 4 hash datas through the I2C bus.
+ * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h.
+ * @param: buf, the data buffer to send.
+ * @param: len, the number of bytes to send.
+ * @return: In case of success the number of bytes sent.
+ * In other case, a < 0 value describing the issue.
+ */
+static int tpm_stm_i2c_send_hash(struct tpm_chip *chip, unsigned char *buf,
+ size_t len)
+{
+ u32 ret = 0, i, size, burstcnt;
+ u8 data;
+
+ struct i2c_client *client;
+ struct st33zp24_platform_data *pin_infos;
+
+ if (chip == NULL)
+ return -EBUSY;
+
+ client = (struct i2c_client *)chip->vendor.iobase;
+ pin_infos = client->dev.platform_data;
+
+ client->flags = 0;
+
+ ret = request_locality(chip);
+ if (ret < 0)
+ goto end;
+
+ burstcnt = get_burstcount(chip);
+ if (burstcnt < 0)
+ goto end;
+
+ data = TPM_DUMMY_BYTE;
+ ret = I2C_WRITE_DATA(client, TPM_HASH_START, &data, 1);
+ if (ret < 0)
+ goto end;
+
+ for (i = 0 ; i < len ;) {
+ size = min_t(int, len - i, burstcnt);
+ ret = I2C_WRITE_DATA(client, TPM_DATA_FIFO, buf + i, size);
+ if (ret < 0)
+ goto end;
+ i += size;
+ }
+
+end:
+ I2C_WRITE_DATA(client, TPM_HASH_END, &data, 1);
+ return ret;
+}
+
+
+/*
+ * tpm_st33_i2c_ioctl provides 2 handles:
+ * - TPMIOC_CANCEL: allow to CANCEL a TPM commands execution.
+ * See tpm_stm_i2c_cancel description above
+ * - TPMIOC_TRANSMIT: allow to transmit a TPM commands.
+ * - TPMIOC_HASH: allow to compute a locality 4 hash
+ * - TPMIOC_CHANGELOCALITY: allow to change the current locality
+ *
+ * @return: In case of success, return TPM response size.
+ * In other case return < 0 value describing the issue.
+ */
+static ssize_t tpm_st33_i2c_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ int in_size = 0, out_size = 0, rc, status;
+ unsigned long stop;
+ struct tpm_chip *chip = file->private_data;
+ st_tpm_hash_t hash_data;
+ struct i2c_client *client;
+ client = (struct i2c_client *) chip->vendor.iobase;
+
+ switch (cmd) {
+ case TPMIOC_CANCEL:
+ tpm_stm_i2c_cancel(chip);
+ return 0;
+ case TPMIOC_TRANSMIT:
+ if (copy_from_user(chip->data_buffer,
+ (const char *)arg, TPM_HEADER_SIZE))
+ return -EFAULT;
+
+ in_size = be32_to_cpu(chip->data_buffer,
+ TPM_HEADER_SIZE);
+ if (copy_from_user(chip->data_buffer,
+ (const char *)arg, in_size))
+ return -EFAULT;
+ tpm_stm_i2c_send(chip, chip->data_buffer, in_size);
+
+ out_size = tpm_stm_i2c_recv(chip, chip->data_buffer,
+ TPM_BUFSIZE);
+ if (copy_to_user((char *)arg, chip->data_buffer, out_size))
+ return -EFAULT;
+ return out_size;
+ case TPMIOC_HASH:
+ if (chip->vendor.locality == LOCALITY4) {
+ if (copy_from_user(&hash_data,
+ (st_tpm_hash_t __user *)arg,
+ sizeof(st_tpm_hash_t)))
+ return -EFAULT;
+ tpm_stm_i2c_send_hash(chip, hash_data.data,
+ hash_data.size);
+
+ if (chip->vendor.irq) {
+ rc = wait_event_interruptible_timeout(
+ chip->vendor.read_queue,
+ (check_locality(chip) != chip->vendor.locality),
+ chip->vendor.timeout_a);
+ if (rc < 0)
+ return -ETIME;
+ return hash_data.size;
+ }
+
+ stop = jiffies + chip->vendor.timeout_a;
+ do {
+ msleep(TPM_TIMEOUT);
+ status = check_locality(chip);
+ if (status != chip->vendor.locality)
+ return hash_data.size;
+ } while (time_before(jiffies, stop));
+ return hash_data.size;
+ }
+ return -ENOSYS;
+ break;
+ case TPMIOC_CHANGELOCALITY:
+ if (arg == LOCALITY0) {
+ client->addr = TPM_I2C_ST33_ADDR_WR_LOC0;
+ chip->vendor.locality = LOCALITY0;
+ return 0;
+ } else if (arg == LOCALITY4) {
+ client->addr = TPM_I2C_ST33_ADDR_WR_LOC4;
+ chip->vendor.locality = LOCALITY4;
+ return 0;
+ } else
+ return -ENOSYS;
+ break;
+ default:
+ return -ENOTTY;
+ }
+ return -ENOTTY;
+}
+
+static const struct file_operations tpm_st33_i2c_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_i2c_tpm = {
+ .send = tpm_stm_i2c_send,
+ .recv = tpm_stm_i2c_recv,
+ .cancel = tpm_stm_i2c_cancel,
+ .status = tpm_stm_i2c_status,
+ .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
+ .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
+ .req_canceled = TPM_STS_COMMAND_READY,
+ .attr_group = &stm_tpm_attr_grp,
+ .miscdev = {.fops = &tpm_st33_i2c_fops,},
+};
+
+static int interrupts ;
+module_param(interrupts, bool, 0444);
+MODULE_PARM_DESC(interrupts, "Enable interrupts");
+
+static int power_mgt = 1;
+module_param(power_mgt, bool, 0444);
+MODULE_PARM_DESC(power_mgt, "Power Management");
+
+/*
+ * tpm_st33_i2c_probe initialize the TPM device
+ * @param: client, the i2c_client drescription (TPM I2C description).
+ * @param: id, the i2c_device_id struct.
+ * @return: 0 in case of success.
+ * -1 in other case.
+ */
+static int
+tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+ u32 err;
+ u8 intmask;
+ struct tpm_chip *chip;
+ struct st33zp24_platform_data *platform_data;
+
+ err = 0;
+
+ if (client == NULL) {
+ pr_info("client is NULL. exiting.\n");
+ err = -ENODEV;
+ goto end;
+ }
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ pr_info("client not i2c capable\n");
+ err = -ENODEV;
+ goto end;
+ }
+
+ chip = tpm_register_hardware(&client->dev, &st_i2c_tpm);
+ if (!chip) {
+ pr_info("fail chip\n");
+ err = -ENODEV;
+ goto end;
+ }
+
+ platform_data = client->dev.platform_data;
+ platform_data->tpm_i2c_buffer[0] =
+ kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
+ if (platform_data->tpm_i2c_buffer[0] == NULL) {
+ err = -ENOMEM;
+ goto _tpm_clean_answer;
+ }
+ platform_data->tpm_i2c_buffer[1] =
+ kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
+ if (platform_data->tpm_i2c_buffer[1] == NULL) {
+ err = -ENOMEM;
+ goto _tpm_clean_response;
+ }
+
+ chip->vendor.iobase = client;
+
+ 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);
+ }
+
+ 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_interruption(client);
+ err = request_irq(gpio_to_irq(platform_data->io_serirq),
+ &tpm_ioserirq_handler,
+ IRQF_TRIGGER_HIGH,
+ "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 = I2C_READ_DATA(client, 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 = I2C_WRITE_DATA(client, TPM_INT_ENABLE, &intmask, 1);
+ if (err < 0)
+ goto _irq_set;
+
+ intmask = TPM_GLOBAL_INT_ENABLE;
+ err = I2C_WRITE_DATA(client, TPM_INT_ENABLE + 3, &intmask, 1);
+ if (err < 0)
+ goto _irq_set;
+
+ err = I2C_READ_DATA(client, TPM_INT_STATUS, &intmask, 1);
+ if (err < 0)
+ goto _irq_set;
+
+ chip->vendor.irq = interrupts;
+
+ tpm_gen_interrupt(chip);
+ }
+
+ tpm_get_timeouts(chip);
+
+ i2c_set_clientdata(client, chip);
+ platform_data->bChipF = false;
+
+ pr_info("TPM I2C Initialized\n");
+ return 0;
+_irq_set:
+ free_irq(gpio_to_irq(platform_data->io_serirq), (void *) 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_i2c_buffer[1] != NULL) {
+ kfree(platform_data->tpm_i2c_buffer[1]);
+ platform_data->tpm_i2c_buffer[1] = NULL;
+ }
+_tpm_clean_answer:
+ if (platform_data->tpm_i2c_buffer[0] != NULL) {
+ kfree(platform_data->tpm_i2c_buffer[0]);
+ platform_data->tpm_i2c_buffer[0] = NULL;
+ }
+
+ platform_data->bChipF = true;
+end:
+ pr_info("TPM I2C initialisation fail\n");
+ return err;
+}
+
+/*
+ * tpm_st33_i2c_remove remove the TPM device
+ * @param: client, the i2c_client drescription (TPM I2C description).
+ clear_bit(0, &chip->is_open);
+ * @return: 0 in case of success.
+ */
+static __devexit int tpm_st33_i2c_remove(struct i2c_client *client)
+{
+ struct tpm_chip *chip = (struct tpm_chip *)i2c_get_clientdata(client);
+ struct st33zp24_platform_data *pin_infos =
+ ((struct i2c_client *) chip->vendor.iobase)->dev.platform_data;
+
+ if (pin_infos != NULL) {
+ free_irq(pin_infos->io_serirq, chip);
+
+ gpio_free(pin_infos->io_serirq);
+ gpio_free(pin_infos->io_lpcpd);
+
+ if (pin_infos->bChipF != true)
+ tpm_remove_hardware(chip->dev);
+ if (pin_infos->tpm_i2c_buffer[1] != NULL) {
+ kfree(pin_infos->tpm_i2c_buffer[1]);
+ pin_infos->tpm_i2c_buffer[1] = NULL;
+ }
+ if (pin_infos->tpm_i2c_buffer[0] != NULL) {
+ kfree(pin_infos->tpm_i2c_buffer[0]);
+ pin_infos->tpm_i2c_buffer[0] = NULL;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * tpm_st33_i2c_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)
+ * @param: client, the i2c_client drescription (TPM I2C description).
+ * @param: mesg, the power management message.
+ * @return: 0 in case of success.
+ */
+static int tpm_st33_i2c_pm_suspend(struct i2c_client *client, pm_message_t mesg)
+{
+ struct tpm_chip *chip =
+ (struct tpm_chip *)i2c_get_clientdata(client);
+ struct st33zp24_platform_data *pin_infos =
+ ((struct i2c_client *)chip->vendor.iobase)->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_i2c_buffer[0];
+ ret = tpm_pm_suspend(&client->dev, mesg);
+ }
+ return ret;
+} /* tpm_st33_i2c_suspend() */
+
+/*
+ * tpm_st33_i2c_pm_resume resume the TPM device
+ * @param: client, the i2c_client drescription (TPM I2C description).
+ * @return: 0 in case of success.
+ */
+static int tpm_st33_i2c_pm_resume(struct i2c_client *client)
+{
+ struct tpm_chip *chip =
+ (struct tpm_chip *)i2c_get_clientdata(client);
+ struct st33zp24_platform_data *pin_infos =
+ ((struct i2c_client *)chip->vendor.iobase)->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_i2c_buffer[0];
+ ret = tpm_pm_resume(&client->dev);
+ if (!ret)
+ tpm_continue_selftest(chip);
+ }
+ return ret;
+} /* tpm_st33_i2c_pm_resume() */
+
+static const struct i2c_device_id tpm_st33_i2c_id[] = {
+ {TPM_ST33_I2C, 0},
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, tpm_st33_i2c_id);
+
+static struct i2c_driver tpm_st33_i2c_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = TPM_ST33_I2C,
+ },
+ .probe = tpm_st33_i2c_probe,
+ .remove = tpm_st33_i2c_remove,
+ .resume = tpm_st33_i2c_pm_resume,
+ .suspend = tpm_st33_i2c_pm_suspend,
+ .id_table = tpm_st33_i2c_id
+};
+
+/*
+ * tpm_st33_i2c_init initialize driver
+ * @return: 0 if successful, else non zero value.
+ */
+static int __init tpm_st33_i2c_init(void)
+{
+ return i2c_add_driver(&tpm_st33_i2c_driver);
+}
+
+/*
+ * tpm_st33_i2c_exit The kernel calls this function during unloading the
+ * module or during shut down process
+ */
+static void __exit tpm_st33_i2c_exit(void)
+{
+ i2c_del_driver(&tpm_st33_i2c_driver);
+}
+
+module_init(tpm_st33_i2c_init);
+module_exit(tpm_st33_i2c_exit);
+
+MODULE_AUTHOR("Christophe Ricard (tpmsupport@...com)");
+MODULE_DESCRIPTION("STM TPM I2C ST33 Driver");
+MODULE_VERSION("1.2.0");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/tpm/tpm_stm_st33_i2c.h b/drivers/char/tpm/tpm_stm_st33_i2c.h
new file mode 100644
index 0000000..5f46c8e
--- /dev/null
+++ b/drivers/char/tpm/tpm_stm_st33_i2c.h
@@ -0,0 +1,91 @@
+/*
+ * STMicroelectronics TPM I2C 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@...com
+ *
+ * @File: stm_st33_tpm_i2c.h
+ *
+ * @Date: 09/15/2010
+ */
+#ifndef __STM_ST33_TPM_I2C_MAIN_H__
+#define __STM_ST33_TPM_I2C_MAIN_H__
+
+#include <linux/pci.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+#include <linux/i2c-id.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/i2c-id.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/sched.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+
+#include "tpm.h"
+
+#define MINOR_NUM_I2C 224
+
+#define TPM_ACCESS (0x0)
+#define TPM_STS (0x18)
+#define TPM_HASH_END (0x20)
+#define TPM_DATA_FIFO (0x24)
+#define TPM_HASH_DATA (0x24)
+#define TPM_HASH_START (0x28)
+#define TPM_INTF_CAPABILITY (0x14)
+#define TPM_INT_STATUS (0x10)
+#define TPM_INT_ENABLE (0x08)
+
+#define TPM_DUMMY_BYTE 0xAA
+#define TPM_WRITE_DIRECTION 0x80
+#define TPM_HEADER_SIZE 10
+#define TPM_BUFSIZE 2048
+
+/* ioctl commands */
+#define TPMIOC_CANCEL _IO('T', 0x00)
+#define TPMIOC_TRANSMIT _IO('T', 0x01)
+#define TPMIOC_HASH _IO('T', 0x02)
+#define TPMIOC_CHANGELOCALITY _IO('T', 0x03)
+
+#define LOCALITY0 0
+#define LOCALITY4 4
+
+typedef struct st_tpm_hash{
+ int size;
+ u8 *data;
+} st_tpm_hash_t;
+
+#endif /* __STM_ST33_TPM_I2C_MAIN_H__ */
diff --git a/include/linux/i2c/tpm_stm_st33_i2c.h b/include/linux/i2c/tpm_stm_st33_i2c.h
new file mode 100644
index 0000000..c9a980d
--- /dev/null
+++ b/include/linux/i2c/tpm_stm_st33_i2c.h
@@ -0,0 +1,48 @@
+/*
+* STMicroelectronics TPM I2C Linux driver for TPM ST33ZP24
+* Copyright (C) 2009, 2010 STMicroelectronics
+* Christophe RICARD tpmsupport@...com
+* 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.
+*
+* @File: stm_st33_tpm_i2c.h
+*
+* @Date: 06/15/2008
+*/
+#ifndef __STM_ST33_TPM_I2C_H__
+#define __STM_ST33_TPM_I2C_H__
+
+#include <linux/i2c.h>
+
+#define TPM_ST33_I2C "st33zp24_i2c"
+#define TPM_I2C_ST33_ADDR_WR_LOC0 (0x26 >> 1)
+#define TPM_I2C_ST33_ADDR_WR_LOC4 (0x36 >> 1)
+
+
+struct st33zp24_platform_data {
+ int io_serirq;
+ int io_lpcpd;
+ struct i2c_client *client;
+ bool bChipF;
+ u8 *tpm_i2c_buffer[2]; /* 0 Request 1 Response */
+ struct completion irq_detection;
+ struct mutex lock;
+};
+
+#endif /* __STM_ST33_TPM_I2C_H__ */
--
1.7.9.5
--
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