2012-11-29 01:22:24 +08:00
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/*
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* STMicroelectronics TPM I2C Linux driver for TPM ST33ZP24
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* Copyright (C) 2009, 2010 STMicroelectronics
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* STMicroelectronics version 1.2.0, Copyright (C) 2010
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* STMicroelectronics comes with ABSOLUTELY NO WARRANTY.
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* This is free software, and you are welcome to redistribute it
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* under certain conditions.
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*
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* @Author: Christophe RICARD tpmsupport@st.com
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*
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* @File: tpm_stm_st33_i2c.c
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*
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* @Synopsis:
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* 09/15/2010: First shot driver tpm_tis driver for
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lpc is used as model.
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*/
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2012-12-06 06:52:43 +08:00
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#include <linux/pci.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/i2c.h>
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#include <linux/fs.h>
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#include <linux/miscdevice.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/wait.h>
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#include <linux/string.h>
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#include <linux/interrupt.h>
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#include <linux/spinlock.h>
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#include <linux/sysfs.h>
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#include <linux/gpio.h>
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#include <linux/sched.h>
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#include <linux/uaccess.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include "tpm.h"
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2013-01-28 21:52:44 +08:00
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#include "tpm_i2c_stm_st33.h"
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2012-11-29 01:22:24 +08:00
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enum stm33zp24_access {
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TPM_ACCESS_VALID = 0x80,
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TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
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TPM_ACCESS_REQUEST_PENDING = 0x04,
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TPM_ACCESS_REQUEST_USE = 0x02,
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};
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enum stm33zp24_status {
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TPM_STS_VALID = 0x80,
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TPM_STS_COMMAND_READY = 0x40,
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TPM_STS_GO = 0x20,
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TPM_STS_DATA_AVAIL = 0x10,
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TPM_STS_DATA_EXPECT = 0x08,
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};
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enum stm33zp24_int_flags {
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TPM_GLOBAL_INT_ENABLE = 0x80,
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TPM_INTF_CMD_READY_INT = 0x080,
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TPM_INTF_FIFO_AVALAIBLE_INT = 0x040,
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TPM_INTF_WAKE_UP_READY_INT = 0x020,
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TPM_INTF_LOCALITY_CHANGE_INT = 0x004,
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TPM_INTF_STS_VALID_INT = 0x002,
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TPM_INTF_DATA_AVAIL_INT = 0x001,
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};
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enum tis_defaults {
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TIS_SHORT_TIMEOUT = 750,
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TIS_LONG_TIMEOUT = 2000,
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};
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/*
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* write8_reg
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* Send byte to the TIS register according to the ST33ZP24 I2C protocol.
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* @param: tpm_register, the tpm tis register where the data should be written
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* @param: tpm_data, the tpm_data to write inside the tpm_register
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* @param: tpm_size, The length of the data
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* @return: Returns negative errno, or else the number of bytes written.
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*/
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static int write8_reg(struct i2c_client *client, u8 tpm_register,
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u8 *tpm_data, u16 tpm_size)
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{
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struct st33zp24_platform_data *pin_infos;
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pin_infos = client->dev.platform_data;
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2013-01-30 05:01:59 +08:00
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pin_infos->tpm_i2c_buffer[0][0] = tpm_register;
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memcpy(&pin_infos->tpm_i2c_buffer[0][1], tpm_data, tpm_size);
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2013-01-30 05:02:02 +08:00
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return i2c_master_send(client, pin_infos->tpm_i2c_buffer[0],
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2012-11-29 01:22:24 +08:00
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tpm_size + 1);
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} /* write8_reg() */
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/*
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* read8_reg
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* Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
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* @param: tpm_register, the tpm tis register where the data should be read
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* @param: tpm_data, the TPM response
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* @param: tpm_size, tpm TPM response size to read.
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* @return: number of byte read successfully: should be one if success.
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*/
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static int read8_reg(struct i2c_client *client, u8 tpm_register,
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u8 *tpm_data, int tpm_size)
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{
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u8 status = 0;
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u8 data;
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data = TPM_DUMMY_BYTE;
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status = write8_reg(client, tpm_register, &data, 1);
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if (status == 2)
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status = i2c_master_recv(client, tpm_data, tpm_size);
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return status;
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} /* read8_reg() */
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/*
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* I2C_WRITE_DATA
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* Send byte to the TIS register according to the ST33ZP24 I2C protocol.
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* @param: client, the chip description
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* @param: tpm_register, the tpm tis register where the data should be written
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* @param: tpm_data, the tpm_data to write inside the tpm_register
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* @param: tpm_size, The length of the data
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* @return: number of byte written successfully: should be one if success.
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*/
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#define I2C_WRITE_DATA(client, tpm_register, tpm_data, tpm_size) \
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(write8_reg(client, tpm_register | \
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TPM_WRITE_DIRECTION, tpm_data, tpm_size))
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/*
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* I2C_READ_DATA
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* Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
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* @param: tpm, the chip description
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* @param: tpm_register, the tpm tis register where the data should be read
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* @param: tpm_data, the TPM response
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* @param: tpm_size, tpm TPM response size to read.
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* @return: number of byte read successfully: should be one if success.
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*/
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#define I2C_READ_DATA(client, tpm_register, tpm_data, tpm_size) \
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(read8_reg(client, tpm_register, tpm_data, tpm_size))
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/*
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* clear_interruption
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* clear the TPM interrupt register.
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* @param: tpm, the chip description
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*/
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static void clear_interruption(struct i2c_client *client)
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{
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u8 interrupt;
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I2C_READ_DATA(client, TPM_INT_STATUS, &interrupt, 1);
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I2C_WRITE_DATA(client, TPM_INT_STATUS, &interrupt, 1);
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I2C_READ_DATA(client, TPM_INT_STATUS, &interrupt, 1);
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} /* clear_interruption() */
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/*
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* _wait_for_interrupt_serirq_timeout
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* @param: tpm, the chip description
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* @param: timeout, the timeout of the interrupt
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* @return: the status of the interruption.
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*/
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static long _wait_for_interrupt_serirq_timeout(struct tpm_chip *chip,
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unsigned long timeout)
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{
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long status;
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struct i2c_client *client;
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struct st33zp24_platform_data *pin_infos;
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2013-03-01 06:15:48 +08:00
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client = (struct i2c_client *)TPM_VPRIV(chip);
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2012-11-29 01:22:24 +08:00
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pin_infos = client->dev.platform_data;
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status = wait_for_completion_interruptible_timeout(
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&pin_infos->irq_detection,
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timeout);
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if (status > 0)
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enable_irq(gpio_to_irq(pin_infos->io_serirq));
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gpio_direction_input(pin_infos->io_serirq);
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return status;
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} /* wait_for_interrupt_serirq_timeout() */
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2012-12-06 06:52:43 +08:00
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static int wait_for_serirq_timeout(struct tpm_chip *chip, bool condition,
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2012-11-29 01:22:24 +08:00
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unsigned long timeout)
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{
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int status = 2;
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struct i2c_client *client;
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2013-03-01 06:15:48 +08:00
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client = (struct i2c_client *)TPM_VPRIV(chip);
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2012-11-29 01:22:24 +08:00
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status = _wait_for_interrupt_serirq_timeout(chip, timeout);
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if (!status) {
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status = -EBUSY;
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2013-03-01 06:15:48 +08:00
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} else {
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2012-11-29 01:22:24 +08:00
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clear_interruption(client);
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if (condition)
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status = 1;
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}
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return status;
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}
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/*
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* tpm_stm_i2c_cancel, cancel is not implemented.
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* @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h
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*/
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static void tpm_stm_i2c_cancel(struct tpm_chip *chip)
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{
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struct i2c_client *client;
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u8 data;
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2013-03-01 06:15:48 +08:00
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client = (struct i2c_client *)TPM_VPRIV(chip);
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2012-11-29 01:22:24 +08:00
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data = TPM_STS_COMMAND_READY;
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I2C_WRITE_DATA(client, TPM_STS, &data, 1);
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if (chip->vendor.irq)
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wait_for_serirq_timeout(chip, 1, chip->vendor.timeout_a);
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} /* tpm_stm_i2c_cancel() */
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/*
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* tpm_stm_spi_status return the TPM_STS register
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* @param: chip, the tpm chip description
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* @return: the TPM_STS register value.
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*/
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static u8 tpm_stm_i2c_status(struct tpm_chip *chip)
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{
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struct i2c_client *client;
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u8 data;
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2013-03-01 06:15:48 +08:00
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client = (struct i2c_client *)TPM_VPRIV(chip);
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2012-11-29 01:22:24 +08:00
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I2C_READ_DATA(client, TPM_STS, &data, 1);
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return data;
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} /* tpm_stm_i2c_status() */
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/*
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* check_locality if the locality is active
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* @param: chip, the tpm chip description
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* @return: the active locality or -EACCESS.
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*/
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static int check_locality(struct tpm_chip *chip)
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{
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struct i2c_client *client;
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u8 data;
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u8 status;
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2013-03-01 06:15:48 +08:00
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client = (struct i2c_client *)TPM_VPRIV(chip);
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2012-11-29 01:22:24 +08:00
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status = I2C_READ_DATA(client, TPM_ACCESS, &data, 1);
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if (status && (data &
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(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
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(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
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return chip->vendor.locality;
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return -EACCES;
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} /* check_locality() */
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/*
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* request_locality request the TPM locality
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* @param: chip, the chip description
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* @return: the active locality or EACCESS.
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*/
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static int request_locality(struct tpm_chip *chip)
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{
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unsigned long stop;
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long rc;
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struct i2c_client *client;
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u8 data;
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2013-03-01 06:15:48 +08:00
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client = (struct i2c_client *)TPM_VPRIV(chip);
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2012-11-29 01:22:24 +08:00
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if (check_locality(chip) == chip->vendor.locality)
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return chip->vendor.locality;
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data = TPM_ACCESS_REQUEST_USE;
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rc = I2C_WRITE_DATA(client, TPM_ACCESS, &data, 1);
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if (rc < 0)
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goto end;
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if (chip->vendor.irq) {
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rc = wait_for_serirq_timeout(chip, (check_locality
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(chip) >= 0),
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chip->vendor.timeout_a);
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if (rc > 0)
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return chip->vendor.locality;
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2013-03-01 06:15:48 +08:00
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} else {
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2012-11-29 01:22:24 +08:00
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stop = jiffies + chip->vendor.timeout_a;
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do {
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if (check_locality(chip) >= 0)
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return chip->vendor.locality;
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msleep(TPM_TIMEOUT);
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} while (time_before(jiffies, stop));
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}
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rc = -EACCES;
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end:
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return rc;
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} /* request_locality() */
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/*
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* release_locality release the active locality
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* @param: chip, the tpm chip description.
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*/
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static void release_locality(struct tpm_chip *chip)
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{
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struct i2c_client *client;
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u8 data;
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2013-03-01 06:15:48 +08:00
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client = (struct i2c_client *)TPM_VPRIV(chip);
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2012-11-29 01:22:24 +08:00
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data = TPM_ACCESS_ACTIVE_LOCALITY;
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I2C_WRITE_DATA(client, TPM_ACCESS, &data, 1);
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}
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/*
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* get_burstcount return the burstcount address 0x19 0x1A
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* @param: chip, the chip description
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* return: the burstcount.
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*/
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static int get_burstcount(struct tpm_chip *chip)
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{
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unsigned long stop;
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int burstcnt, status;
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u8 tpm_reg, temp;
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2013-03-01 06:15:48 +08:00
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struct i2c_client *client = (struct i2c_client *)TPM_VPRIV(chip);
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2012-11-29 01:22:24 +08:00
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stop = jiffies + chip->vendor.timeout_d;
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do {
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tpm_reg = TPM_STS + 1;
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|
|
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;
|
2013-03-01 06:15:48 +08:00
|
|
|
} else {
|
2012-11-29 01:22:24 +08:00
|
|
|
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 number of bytes read from TPM FIFO.
|
|
|
|
*/
|
|
|
|
static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
|
|
|
|
{
|
|
|
|
int size = 0, burstcnt, len;
|
|
|
|
struct i2c_client *client;
|
|
|
|
|
2013-03-01 06:15:48 +08:00
|
|
|
client = (struct i2c_client *)TPM_VPRIV(chip);
|
2012-11-29 01:22:24 +08:00
|
|
|
|
|
|
|
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);
|
2013-10-30 07:54:20 +08:00
|
|
|
if (burstcnt < 0)
|
|
|
|
return burstcnt;
|
2012-11-29 01:22:24 +08:00
|
|
|
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);
|
|
|
|
|
2013-03-01 06:15:48 +08:00
|
|
|
client = (struct i2c_client *)TPM_VPRIV(chip);
|
2012-11-29 01:22:24 +08:00
|
|
|
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)
|
|
|
|
{
|
2013-10-30 07:54:20 +08:00
|
|
|
u32 status, i, size;
|
|
|
|
int burstcnt = 0;
|
2012-12-06 06:52:43 +08:00
|
|
|
int ret;
|
2012-11-29 01:22:24 +08:00
|
|
|
u8 data;
|
|
|
|
struct i2c_client *client;
|
|
|
|
|
|
|
|
if (chip == NULL)
|
|
|
|
return -EBUSY;
|
|
|
|
if (len < TPM_HEADER_SIZE)
|
|
|
|
return -EBUSY;
|
|
|
|
|
2012-12-06 06:52:43 +08:00
|
|
|
client = (struct i2c_client *)TPM_VPRIV(chip);
|
2012-11-29 01:22:24 +08:00
|
|
|
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2013-03-01 06:15:48 +08:00
|
|
|
for (i = 0; i < len - 1;) {
|
2012-11-29 01:22:24 +08:00
|
|
|
burstcnt = get_burstcount(chip);
|
2013-10-30 07:54:20 +08:00
|
|
|
if (burstcnt < 0)
|
|
|
|
return burstcnt;
|
2012-11-29 01:22:24 +08:00
|
|
|
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;
|
|
|
|
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2013-03-01 06:15:48 +08:00
|
|
|
expected = be32_to_cpu(*(__be32 *)(buf + 2));
|
2012-11-29 01:22:24 +08:00
|
|
|
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:
|
2013-11-27 04:30:44 +08:00
|
|
|
chip->ops->cancel(chip);
|
2012-11-29 01:22:24 +08:00
|
|
|
release_locality(chip);
|
|
|
|
return size;
|
|
|
|
}
|
|
|
|
|
2013-01-23 03:52:35 +08:00
|
|
|
static bool tpm_st33_i2c_req_canceled(struct tpm_chip *chip, u8 status)
|
|
|
|
{
|
2013-03-01 06:15:48 +08:00
|
|
|
return (status == TPM_STS_COMMAND_READY);
|
2013-01-23 03:52:35 +08:00
|
|
|
}
|
|
|
|
|
2013-11-27 04:30:43 +08:00
|
|
|
static const struct tpm_class_ops st_i2c_tpm = {
|
2012-11-29 01:22:24 +08:00
|
|
|
.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,
|
2013-01-23 03:52:35 +08:00
|
|
|
.req_canceled = tpm_st33_i2c_req_canceled,
|
2012-11-29 01:22:24 +08:00
|
|
|
};
|
|
|
|
|
2013-03-01 06:15:48 +08:00
|
|
|
static int interrupts;
|
2012-11-29 01:22:24 +08:00
|
|
|
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_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)
|
|
|
|
{
|
2012-12-06 06:52:43 +08:00
|
|
|
int err;
|
2012-11-29 01:22:24 +08:00
|
|
|
u8 intmask;
|
|
|
|
struct tpm_chip *chip;
|
|
|
|
struct st33zp24_platform_data *platform_data;
|
|
|
|
|
|
|
|
if (client == NULL) {
|
2013-01-19 07:42:25 +08:00
|
|
|
pr_info("%s: i2c client is NULL. Device not accessible.\n",
|
|
|
|
__func__);
|
2012-11-29 01:22:24 +08:00
|
|
|
err = -ENODEV;
|
|
|
|
goto end;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
|
|
|
|
dev_info(&client->dev, "client not i2c capable\n");
|
|
|
|
err = -ENODEV;
|
|
|
|
goto end;
|
|
|
|
}
|
|
|
|
|
|
|
|
chip = tpm_register_hardware(&client->dev, &st_i2c_tpm);
|
|
|
|
if (!chip) {
|
|
|
|
dev_info(&client->dev, "fail chip\n");
|
|
|
|
err = -ENODEV;
|
|
|
|
goto end;
|
|
|
|
}
|
|
|
|
|
|
|
|
platform_data = client->dev.platform_data;
|
2013-01-19 07:42:25 +08:00
|
|
|
|
|
|
|
if (!platform_data) {
|
|
|
|
dev_info(&client->dev, "chip not available\n");
|
|
|
|
err = -ENODEV;
|
|
|
|
goto _tpm_clean_answer;
|
|
|
|
}
|
|
|
|
|
2012-11-29 01:22:24 +08:00
|
|
|
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;
|
2012-12-06 06:52:43 +08:00
|
|
|
goto _tpm_clean_response1;
|
2012-11-29 01:22:24 +08:00
|
|
|
}
|
|
|
|
|
2012-12-06 06:52:43 +08:00
|
|
|
TPM_VPRIV(chip) = client;
|
2012-11-29 01:22:24 +08:00
|
|
|
|
|
|
|
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;
|
2012-12-06 06:52:43 +08:00
|
|
|
goto _tpm_clean_response2;
|
2012-11-29 01:22:24 +08:00
|
|
|
}
|
|
|
|
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) {
|
|
|
|
dev_err(chip->dev , "TPM SERIRQ signals %d not available\n",
|
2013-03-01 06:15:48 +08:00
|
|
|
gpio_to_irq(platform_data->io_serirq));
|
2012-11-29 01:22:24 +08:00
|
|
|
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_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);
|
|
|
|
|
|
|
|
dev_info(chip->dev, "TPM I2C Initialized\n");
|
|
|
|
return 0;
|
|
|
|
_irq_set:
|
2013-03-01 06:15:48 +08:00
|
|
|
free_irq(gpio_to_irq(platform_data->io_serirq), (void *)chip);
|
2012-11-29 01:22:24 +08:00
|
|
|
_gpio_init2:
|
2012-12-06 06:52:43 +08:00
|
|
|
if (interrupts)
|
2012-11-29 01:22:24 +08:00
|
|
|
gpio_free(platform_data->io_serirq);
|
|
|
|
_gpio_init1:
|
2012-12-06 06:52:43 +08:00
|
|
|
if (power_mgt)
|
2012-11-29 01:22:24 +08:00
|
|
|
gpio_free(platform_data->io_lpcpd);
|
2012-12-06 06:52:43 +08:00
|
|
|
_tpm_clean_response2:
|
|
|
|
kzfree(platform_data->tpm_i2c_buffer[1]);
|
|
|
|
platform_data->tpm_i2c_buffer[1] = NULL;
|
|
|
|
_tpm_clean_response1:
|
|
|
|
kzfree(platform_data->tpm_i2c_buffer[0]);
|
|
|
|
platform_data->tpm_i2c_buffer[0] = NULL;
|
2012-11-29 01:22:24 +08:00
|
|
|
_tpm_clean_answer:
|
2012-12-06 06:52:43 +08:00
|
|
|
tpm_remove_hardware(chip->dev);
|
2012-11-29 01:22:24 +08:00
|
|
|
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.
|
|
|
|
*/
|
2013-01-30 05:02:00 +08:00
|
|
|
static int tpm_st33_i2c_remove(struct i2c_client *client)
|
2012-11-29 01:22:24 +08:00
|
|
|
{
|
|
|
|
struct tpm_chip *chip = (struct tpm_chip *)i2c_get_clientdata(client);
|
|
|
|
struct st33zp24_platform_data *pin_infos =
|
2013-03-01 06:15:48 +08:00
|
|
|
((struct i2c_client *)TPM_VPRIV(chip))->dev.platform_data;
|
2012-11-29 01:22:24 +08:00
|
|
|
|
|
|
|
if (pin_infos != NULL) {
|
|
|
|
free_irq(pin_infos->io_serirq, chip);
|
|
|
|
|
|
|
|
gpio_free(pin_infos->io_serirq);
|
|
|
|
gpio_free(pin_infos->io_lpcpd);
|
|
|
|
|
2013-01-19 07:42:25 +08:00
|
|
|
tpm_remove_hardware(chip->dev);
|
|
|
|
|
2012-11-29 01:22:24 +08:00
|
|
|
if (pin_infos->tpm_i2c_buffer[1] != NULL) {
|
|
|
|
kzfree(pin_infos->tpm_i2c_buffer[1]);
|
|
|
|
pin_infos->tpm_i2c_buffer[1] = NULL;
|
|
|
|
}
|
|
|
|
if (pin_infos->tpm_i2c_buffer[0] != NULL) {
|
|
|
|
kzfree(pin_infos->tpm_i2c_buffer[0]);
|
|
|
|
pin_infos->tpm_i2c_buffer[0] = NULL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2012-12-06 08:20:51 +08:00
|
|
|
#ifdef CONFIG_PM_SLEEP
|
2012-11-29 01:22:24 +08:00
|
|
|
/*
|
|
|
|
* tpm_st33_i2c_pm_suspend suspend the TPM device
|
|
|
|
* @param: client, the i2c_client drescription (TPM I2C description).
|
|
|
|
* @param: mesg, the power management message.
|
|
|
|
* @return: 0 in case of success.
|
|
|
|
*/
|
2012-12-06 08:20:51 +08:00
|
|
|
static int tpm_st33_i2c_pm_suspend(struct device *dev)
|
2012-11-29 01:22:24 +08:00
|
|
|
{
|
2012-12-06 08:20:51 +08:00
|
|
|
struct st33zp24_platform_data *pin_infos = dev->platform_data;
|
2012-11-29 01:22:24 +08:00
|
|
|
int ret = 0;
|
|
|
|
|
2013-03-01 06:15:48 +08:00
|
|
|
if (power_mgt) {
|
2012-11-29 01:22:24 +08:00
|
|
|
gpio_set_value(pin_infos->io_lpcpd, 0);
|
2013-03-01 06:15:48 +08:00
|
|
|
} else {
|
2012-12-06 08:20:51 +08:00
|
|
|
ret = tpm_pm_suspend(dev);
|
2012-11-29 01:22:24 +08:00
|
|
|
}
|
|
|
|
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.
|
|
|
|
*/
|
2012-12-06 08:20:51 +08:00
|
|
|
static int tpm_st33_i2c_pm_resume(struct device *dev)
|
2012-11-29 01:22:24 +08:00
|
|
|
{
|
2012-12-06 08:20:51 +08:00
|
|
|
struct tpm_chip *chip = dev_get_drvdata(dev);
|
|
|
|
struct st33zp24_platform_data *pin_infos = dev->platform_data;
|
2012-11-29 01:22:24 +08:00
|
|
|
|
|
|
|
int ret = 0;
|
|
|
|
|
|
|
|
if (power_mgt) {
|
|
|
|
gpio_set_value(pin_infos->io_lpcpd, 1);
|
|
|
|
ret = wait_for_serirq_timeout(chip,
|
2013-11-27 04:30:44 +08:00
|
|
|
(chip->ops->status(chip) &
|
2012-11-29 01:22:24 +08:00
|
|
|
TPM_STS_VALID) == TPM_STS_VALID,
|
|
|
|
chip->vendor.timeout_b);
|
2013-03-01 06:15:48 +08:00
|
|
|
} else {
|
|
|
|
ret = tpm_pm_resume(dev);
|
|
|
|
if (!ret)
|
|
|
|
tpm_do_selftest(chip);
|
2012-11-29 01:22:24 +08:00
|
|
|
}
|
|
|
|
return ret;
|
|
|
|
} /* tpm_st33_i2c_pm_resume() */
|
2012-12-06 08:20:51 +08:00
|
|
|
#endif
|
2012-11-29 01:22:24 +08:00
|
|
|
|
|
|
|
static const struct i2c_device_id tpm_st33_i2c_id[] = {
|
|
|
|
{TPM_ST33_I2C, 0},
|
|
|
|
{}
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, tpm_st33_i2c_id);
|
2013-03-01 06:15:48 +08:00
|
|
|
static SIMPLE_DEV_PM_OPS(tpm_st33_i2c_ops, tpm_st33_i2c_pm_suspend,
|
|
|
|
tpm_st33_i2c_pm_resume);
|
2012-11-29 01:22:24 +08:00
|
|
|
static struct i2c_driver tpm_st33_i2c_driver = {
|
|
|
|
.driver = {
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.name = TPM_ST33_I2C,
|
2012-12-06 08:20:51 +08:00
|
|
|
.pm = &tpm_st33_i2c_ops,
|
2012-11-29 01:22:24 +08:00
|
|
|
},
|
|
|
|
.probe = tpm_st33_i2c_probe,
|
|
|
|
.remove = tpm_st33_i2c_remove,
|
|
|
|
.id_table = tpm_st33_i2c_id
|
|
|
|
};
|
|
|
|
|
2012-12-06 06:52:43 +08:00
|
|
|
module_i2c_driver(tpm_st33_i2c_driver);
|
2012-11-29 01:22:24 +08:00
|
|
|
|
|
|
|
MODULE_AUTHOR("Christophe Ricard (tpmsupport@st.com)");
|
|
|
|
MODULE_DESCRIPTION("STM TPM I2C ST33 Driver");
|
|
|
|
MODULE_VERSION("1.2.0");
|
2012-12-06 06:52:43 +08:00
|
|
|
MODULE_LICENSE("GPL");
|