tpm/tpm_i2c_stm_st33: Split tpm_i2c_tpm_st33 in 2 layers (core + phy)
tpm_i2c_stm_st33 is a TIS 1.2 TPM with a core interface which can be used by different phy such as i2c or spi. The core part is called st33zp24 which is also the main part reference. include/linux/platform_data/tpm_stm_st33.h is renamed consequently. The driver is also split into an i2c phy in charge of sending/receiving data as well as managing platform data or dts configuration. Acked-by: Jarkko Sakkinen <jarkko.sakknen@linux.intel.com> Reviewed-by: Jason Gunthorpe <jason.gunthorpe@obsidianresearch.com> Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com> Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
This commit is contained in:
Christophe Ricard
Peter Huewe
Родитель
fe7d36859f
Коммит
bf38b87108
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@ -100,16 +100,6 @@ config TCG_IBMVTPM
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will be accessible from within Linux. To compile this driver
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as a module, choose M here; the module will be called tpm_ibmvtpm.
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config TCG_TIS_I2C_ST33
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tristate "TPM Interface Specification 1.2 Interface (I2C - STMicroelectronics)"
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depends on I2C
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depends on GPIOLIB
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---help---
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If you have a TPM security chip from STMicroelectronics working with
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an I2C bus say Yes and it will be accessible from within Linux.
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To compile this driver as a module, choose M here; the module will be
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called tpm_i2c_stm_st33.
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config TCG_XEN
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tristate "XEN TPM Interface"
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depends on TCG_TPM && XEN
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@ -131,4 +121,5 @@ config TCG_CRB
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from within Linux. To compile this driver as a module, choose
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M here; the module will be called tpm_crb.
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source "drivers/char/tpm/st33zp24/Kconfig"
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endif # TCG_TPM
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@ -20,6 +20,6 @@ obj-$(CONFIG_TCG_NSC) += tpm_nsc.o
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obj-$(CONFIG_TCG_ATMEL) += tpm_atmel.o
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obj-$(CONFIG_TCG_INFINEON) += tpm_infineon.o
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obj-$(CONFIG_TCG_IBMVTPM) += tpm_ibmvtpm.o
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obj-$(CONFIG_TCG_TIS_I2C_ST33) += tpm_i2c_stm_st33.o
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obj-$(CONFIG_TCG_TIS_ST33ZP24) += st33zp24/
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obj-$(CONFIG_TCG_XEN) += xen-tpmfront.o
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obj-$(CONFIG_TCG_CRB) += tpm_crb.o
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@ -0,0 +1,20 @@
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config TCG_TIS_ST33ZP24
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tristate "STMicroelectronics TPM Interface Specification 1.2 Interface"
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depends on GPIOLIB
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---help---
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STMicroelectronics ST33ZP24 core driver. It implements the core
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TPM1.2 logic and hooks into the TPM kernel APIs. Physical layers will
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register against it.
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To compile this driver as a module, choose m here. The module will be called
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tpm_st33zp24.
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config TCG_TIS_ST33ZP24_I2C
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tristate "TPM 1.2 ST33ZP24 I2C support"
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depends on TCG_TIS_ST33ZP24
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depends on I2C
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---help---
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This module adds support for the STMicroelectronics TPM security chip
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ST33ZP24 with i2c interface.
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To compile this driver as a module, choose M here; the module will be
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called tpm_st33zp24_i2c.
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@ -0,0 +1,9 @@
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#
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# Makefile for ST33ZP24 TPM 1.2 driver
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#
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tpm_st33zp24-objs = st33zp24.o
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obj-$(CONFIG_TCG_TIS_ST33ZP24) += tpm_st33zp24.o
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tpm_st33zp24_i2c-objs = i2c.o
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obj-$(CONFIG_TCG_TIS_ST33ZP24_I2C) += tpm_st33zp24_i2c.o
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@ -0,0 +1,278 @@
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/*
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* STMicroelectronics TPM I2C Linux driver for TPM ST33ZP24
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* Copyright (C) 2009 - 2015 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
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/gpio.h>
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#include <linux/of_irq.h>
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#include <linux/of_gpio.h>
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#include <linux/tpm.h>
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#include <linux/platform_data/st33zp24.h>
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#include "st33zp24.h"
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#define TPM_DUMMY_BYTE 0xAA
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#define TPM_WRITE_DIRECTION 0x80
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#define TPM_BUFSIZE 2048
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struct st33zp24_i2c_phy {
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struct i2c_client *client;
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u8 buf[TPM_BUFSIZE + 1];
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int io_lpcpd;
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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(void *phy_id, u8 tpm_register, u8 *tpm_data, int tpm_size)
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{
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struct st33zp24_i2c_phy *phy = phy_id;
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phy->buf[0] = tpm_register;
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memcpy(phy->buf + 1, tpm_data, tpm_size);
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return i2c_master_send(phy->client, phy->buf, 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(void *phy_id, u8 tpm_register, u8 *tpm_data, int tpm_size)
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{
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struct st33zp24_i2c_phy *phy = phy_id;
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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(phy, tpm_register, &data, 1);
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if (status == 2)
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status = i2c_master_recv(phy->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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* st33zp24_i2c_send
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* Send byte to the TIS register according to the ST33ZP24 I2C protocol.
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* @param: phy_id, the phy 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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static int st33zp24_i2c_send(void *phy_id, u8 tpm_register, u8 *tpm_data,
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int tpm_size)
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{
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return write8_reg(phy_id, tpm_register | TPM_WRITE_DIRECTION, tpm_data,
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tpm_size);
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}
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/*
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* st33zp24_i2c_recv
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* Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
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* @param: phy_id, the phy 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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static int st33zp24_i2c_recv(void *phy_id, u8 tpm_register, u8 *tpm_data,
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int tpm_size)
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{
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return read8_reg(phy_id, tpm_register, tpm_data, tpm_size);
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}
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static const struct st33zp24_phy_ops i2c_phy_ops = {
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.send = st33zp24_i2c_send,
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.recv = st33zp24_i2c_recv,
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};
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#ifdef CONFIG_OF
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static int st33zp24_i2c_of_request_resources(struct st33zp24_i2c_phy *phy)
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{
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struct device_node *pp;
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struct i2c_client *client = phy->client;
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int gpio;
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int ret;
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pp = client->dev.of_node;
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if (!pp) {
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dev_err(&client->dev, "No platform data\n");
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return -ENODEV;
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}
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/* Get GPIO from device tree */
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gpio = of_get_named_gpio(pp, "lpcpd-gpios", 0);
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if (gpio < 0) {
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dev_err(&client->dev,
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"Failed to retrieve lpcpd-gpios from dts.\n");
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phy->io_lpcpd = -1;
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/*
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* lpcpd pin is not specified. This is not an issue as
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* power management can be also managed by TPM specific
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* commands. So leave with a success status code.
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*/
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return 0;
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}
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/* GPIO request and configuration */
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ret = devm_gpio_request_one(&client->dev, gpio,
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GPIOF_OUT_INIT_HIGH, "TPM IO LPCPD");
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if (ret) {
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dev_err(&client->dev, "Failed to request lpcpd pin\n");
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return -ENODEV;
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}
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phy->io_lpcpd = gpio;
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return 0;
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}
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#else
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static int st33zp24_i2c_of_request_resources(struct st33zp24_i2c_phy *phy)
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{
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return -ENODEV;
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}
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#endif
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static int st33zp24_i2c_request_resources(struct i2c_client *client,
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struct st33zp24_i2c_phy *phy)
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{
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struct st33zp24_platform_data *pdata;
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int ret;
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pdata = client->dev.platform_data;
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if (!pdata) {
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dev_err(&client->dev, "No platform data\n");
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return -ENODEV;
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}
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/* store for late use */
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phy->io_lpcpd = pdata->io_lpcpd;
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if (gpio_is_valid(pdata->io_lpcpd)) {
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ret = devm_gpio_request_one(&client->dev,
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pdata->io_lpcpd, GPIOF_OUT_INIT_HIGH,
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"TPM IO_LPCPD");
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if (ret) {
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dev_err(&client->dev, "Failed to request lpcpd pin\n");
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return ret;
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}
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}
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return 0;
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}
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/*
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* st33zp24_i2c_probe initialize the TPM device
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* @param: client, the i2c_client drescription (TPM I2C description).
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* @param: id, the i2c_device_id struct.
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* @return: 0 in case of success.
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* -1 in other case.
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*/
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static int st33zp24_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int ret;
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struct st33zp24_platform_data *pdata;
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struct st33zp24_i2c_phy *phy;
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if (!client) {
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pr_info("%s: i2c client is NULL. Device not accessible.\n",
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__func__);
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return -ENODEV;
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}
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
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dev_info(&client->dev, "client not i2c capable\n");
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return -ENODEV;
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}
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phy = devm_kzalloc(&client->dev, sizeof(struct st33zp24_i2c_phy),
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GFP_KERNEL);
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if (!phy)
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return -ENOMEM;
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phy->client = client;
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pdata = client->dev.platform_data;
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if (!pdata && client->dev.of_node) {
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ret = st33zp24_i2c_of_request_resources(phy);
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if (ret)
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return ret;
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} else if (pdata) {
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ret = st33zp24_i2c_request_resources(client, phy);
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if (ret)
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return ret;
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}
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return st33zp24_probe(phy, &i2c_phy_ops, &client->dev, client->irq,
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phy->io_lpcpd);
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}
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/*
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* st33zp24_i2c_remove remove the TPM device
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* @param: client, the i2c_client description (TPM I2C description).
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* @return: 0 in case of success.
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*/
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static int st33zp24_i2c_remove(struct i2c_client *client)
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{
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struct tpm_chip *chip = i2c_get_clientdata(client);
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return st33zp24_remove(chip);
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}
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static const struct i2c_device_id st33zp24_i2c_id[] = {
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{TPM_ST33_I2C, 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, st33zp24_i2c_id);
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#ifdef CONFIG_OF
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static const struct of_device_id of_st33zp24_i2c_match[] = {
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{ .compatible = "st,st33zp24-i2c", },
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{}
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};
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MODULE_DEVICE_TABLE(of, of_st33zp24_i2c_match);
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#endif
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static SIMPLE_DEV_PM_OPS(st33zp24_i2c_ops, st33zp24_pm_suspend,
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st33zp24_pm_resume);
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static struct i2c_driver st33zp24_i2c_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = TPM_ST33_I2C,
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.pm = &st33zp24_i2c_ops,
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.of_match_table = of_match_ptr(of_st33zp24_i2c_match),
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},
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.probe = st33zp24_i2c_probe,
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.remove = st33zp24_i2c_remove,
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.id_table = st33zp24_i2c_id
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};
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module_i2c_driver(st33zp24_i2c_driver);
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MODULE_AUTHOR("TPM support (TPMsupport@list.st.com)");
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MODULE_DESCRIPTION("STM TPM 1.2 I2C ST33 Driver");
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MODULE_VERSION("1.3.0");
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MODULE_LICENSE("GPL");
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@ -0,0 +1,688 @@
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/*
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* STMicroelectronics TPM Linux driver for TPM ST33ZP24
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||||
* Copyright (C) 2009 - 2015 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, see <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
#include <linux/module.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/freezer.h>
|
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#include <linux/string.h>
|
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#include <linux/interrupt.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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#include "st33zp24.h"
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#define TPM_ACCESS 0x0
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#define TPM_STS 0x18
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#define TPM_DATA_FIFO 0x24
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#define TPM_INTF_CAPABILITY 0x14
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#define TPM_INT_STATUS 0x10
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#define TPM_INT_ENABLE 0x08
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#define LOCALITY0 0
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enum st33zp24_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,
|
||||
};
|
||||
|
||||
enum st33zp24_status {
|
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TPM_STS_VALID = 0x80,
|
||||
TPM_STS_COMMAND_READY = 0x40,
|
||||
TPM_STS_GO = 0x20,
|
||||
TPM_STS_DATA_AVAIL = 0x10,
|
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TPM_STS_DATA_EXPECT = 0x08,
|
||||
};
|
||||
|
||||
enum st33zp24_int_flags {
|
||||
TPM_GLOBAL_INT_ENABLE = 0x80,
|
||||
TPM_INTF_CMD_READY_INT = 0x080,
|
||||
TPM_INTF_FIFO_AVALAIBLE_INT = 0x040,
|
||||
TPM_INTF_WAKE_UP_READY_INT = 0x020,
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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,
|
||||
};
|
||||
|
||||
struct st33zp24_dev {
|
||||
struct tpm_chip *chip;
|
||||
void *phy_id;
|
||||
const struct st33zp24_phy_ops *ops;
|
||||
u32 intrs;
|
||||
int io_lpcpd;
|
||||
};
|
||||
|
||||
/*
|
||||
* clear_interruption clear the pending interrupt.
|
||||
* @param: tpm_dev, the tpm device device.
|
||||
* @return: the interrupt status value.
|
||||
*/
|
||||
static u8 clear_interruption(struct st33zp24_dev *tpm_dev)
|
||||
{
|
||||
u8 interrupt;
|
||||
|
||||
tpm_dev->ops->recv(tpm_dev->phy_id, TPM_INT_STATUS, &interrupt, 1);
|
||||
tpm_dev->ops->send(tpm_dev->phy_id, TPM_INT_STATUS, &interrupt, 1);
|
||||
return interrupt;
|
||||
} /* clear_interruption() */
|
||||
|
||||
/*
|
||||
* st33zp24_cancel, cancel the current command execution or
|
||||
* set STS to COMMAND READY.
|
||||
* @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h
|
||||
*/
|
||||
static void st33zp24_cancel(struct tpm_chip *chip)
|
||||
{
|
||||
struct st33zp24_dev *tpm_dev;
|
||||
u8 data;
|
||||
|
||||
tpm_dev = (struct st33zp24_dev *)TPM_VPRIV(chip);
|
||||
|
||||
data = TPM_STS_COMMAND_READY;
|
||||
tpm_dev->ops->send(tpm_dev->phy_id, TPM_STS, &data, 1);
|
||||
} /* st33zp24_cancel() */
|
||||
|
||||
/*
|
||||
* st33zp24_status return the TPM_STS register
|
||||
* @param: chip, the tpm chip description
|
||||
* @return: the TPM_STS register value.
|
||||
*/
|
||||
static u8 st33zp24_status(struct tpm_chip *chip)
|
||||
{
|
||||
struct st33zp24_dev *tpm_dev;
|
||||
u8 data;
|
||||
|
||||
tpm_dev = (struct st33zp24_dev *)TPM_VPRIV(chip);
|
||||
|
||||
tpm_dev->ops->recv(tpm_dev->phy_id, TPM_STS, &data, 1);
|
||||
return data;
|
||||
} /* st33zp24_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)
|
||||
{
|
||||
struct st33zp24_dev *tpm_dev;
|
||||
u8 data;
|
||||
u8 status;
|
||||
|
||||
tpm_dev = (struct st33zp24_dev *)TPM_VPRIV(chip);
|
||||
|
||||
status = tpm_dev->ops->recv(tpm_dev->phy_id, TPM_ACCESS, &data, 1);
|
||||
if (status && (data &
|
||||
(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
|
||||
(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
|
||||
return chip->vendor.locality;
|
||||
|
||||
return -EACCES;
|
||||
} /* check_locality() */
|
||||
|
||||
/*
|
||||
* request_locality request the TPM locality
|
||||
* @param: chip, the chip description
|
||||
* @return: the active locality or negative value.
|
||||
*/
|
||||
static int request_locality(struct tpm_chip *chip)
|
||||
{
|
||||
unsigned long stop;
|
||||
long ret;
|
||||
struct st33zp24_dev *tpm_dev;
|
||||
u8 data;
|
||||
|
||||
if (check_locality(chip) == chip->vendor.locality)
|
||||
return chip->vendor.locality;
|
||||
|
||||
tpm_dev = (struct st33zp24_dev *)TPM_VPRIV(chip);
|
||||
|
||||
data = TPM_ACCESS_REQUEST_USE;
|
||||
ret = tpm_dev->ops->send(tpm_dev->phy_id, TPM_ACCESS, &data, 1);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
stop = jiffies + chip->vendor.timeout_a;
|
||||
|
||||
/* Request locality is usually effective after the request */
|
||||
do {
|
||||
if (check_locality(chip) >= 0)
|
||||
return chip->vendor.locality;
|
||||
msleep(TPM_TIMEOUT);
|
||||
} while (time_before(jiffies, stop));
|
||||
|
||||
/* could not get locality */
|
||||
return -EACCES;
|
||||
} /* request_locality() */
|
||||
|
||||
/*
|
||||
* release_locality release the active locality
|
||||
* @param: chip, the tpm chip description.
|
||||
*/
|
||||
static void release_locality(struct tpm_chip *chip)
|
||||
{
|
||||
struct st33zp24_dev *tpm_dev;
|
||||
u8 data;
|
||||
|
||||
tpm_dev = (struct st33zp24_dev *)TPM_VPRIV(chip);
|
||||
data = TPM_ACCESS_ACTIVE_LOCALITY;
|
||||
|
||||
tpm_dev->ops->send(tpm_dev->phy_id, TPM_ACCESS, &data, 1);
|
||||
}
|
||||
|
||||
/*
|
||||
* get_burstcount return the burstcount value
|
||||
* @param: chip, the chip description
|
||||
* return: the burstcount or negative value.
|
||||
*/
|
||||
static int get_burstcount(struct tpm_chip *chip)
|
||||
{
|
||||
unsigned long stop;
|
||||
int burstcnt, status;
|
||||
u8 tpm_reg, temp;
|
||||
struct st33zp24_dev *tpm_dev;
|
||||
|
||||
tpm_dev = (struct st33zp24_dev *)TPM_VPRIV(chip);
|
||||
|
||||
stop = jiffies + chip->vendor.timeout_d;
|
||||
do {
|
||||
tpm_reg = TPM_STS + 1;
|
||||
status = tpm_dev->ops->recv(tpm_dev->phy_id, tpm_reg, &temp, 1);
|
||||
if (status < 0)
|
||||
return -EBUSY;
|
||||
|
||||
tpm_reg = TPM_STS + 2;
|
||||
burstcnt = temp;
|
||||
status = tpm_dev->ops->recv(tpm_dev->phy_id, tpm_reg, &temp, 1);
|
||||
if (status < 0)
|
||||
return -EBUSY;
|
||||
|
||||
burstcnt |= temp << 8;
|
||||
if (burstcnt)
|
||||
return burstcnt;
|
||||
msleep(TPM_TIMEOUT);
|
||||
} while (time_before(jiffies, stop));
|
||||
return -EBUSY;
|
||||
} /* get_burstcount() */
|
||||
|
||||
|
||||
/*
|
||||
* wait_for_tpm_stat_cond
|
||||
* @param: chip, chip description
|
||||
* @param: mask, expected mask value
|
||||
* @param: check_cancel, does the command expected to be canceled ?
|
||||
* @param: canceled, did we received a cancel request ?
|
||||
* @return: true if status == mask or if the command is canceled.
|
||||
* false in other cases.
|
||||
*/
|
||||
static bool wait_for_tpm_stat_cond(struct tpm_chip *chip, u8 mask,
|
||||
bool check_cancel, bool *canceled)
|
||||
{
|
||||
u8 status = chip->ops->status(chip);
|
||||
|
||||
*canceled = false;
|
||||
if ((status & mask) == mask)
|
||||
return true;
|
||||
if (check_cancel && chip->ops->req_canceled(chip, status)) {
|
||||
*canceled = true;
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
/*
|
||||
* wait_for_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.
|
||||
* @param: check_cancel, does the command can be cancelled ?
|
||||
* @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, bool check_cancel)
|
||||
{
|
||||
unsigned long stop;
|
||||
int ret = 0;
|
||||
bool canceled = false;
|
||||
bool condition;
|
||||
u32 cur_intrs;
|
||||
u8 status;
|
||||
struct st33zp24_dev *tpm_dev;
|
||||
|
||||
tpm_dev = (struct st33zp24_dev *)TPM_VPRIV(chip);
|
||||
|
||||
/* check current status */
|
||||
status = st33zp24_status(chip);
|
||||
if ((status & mask) == mask)
|
||||
return 0;
|
||||
|
||||
stop = jiffies + timeout;
|
||||
|
||||
if (chip->vendor.irq) {
|
||||
cur_intrs = tpm_dev->intrs;
|
||||
clear_interruption(tpm_dev);
|
||||
enable_irq(chip->vendor.irq);
|
||||
|
||||
do {
|
||||
if (ret == -ERESTARTSYS && freezing(current))
|
||||
clear_thread_flag(TIF_SIGPENDING);
|
||||
|
||||
timeout = stop - jiffies;
|
||||
if ((long) timeout <= 0)
|
||||
return -1;
|
||||
|
||||
ret = wait_event_interruptible_timeout(*queue,
|
||||
cur_intrs != tpm_dev->intrs,
|
||||
timeout);
|
||||
clear_interruption(tpm_dev);
|
||||
condition = wait_for_tpm_stat_cond(chip, mask,
|
||||
check_cancel, &canceled);
|
||||
if (ret >= 0 && condition) {
|
||||
if (canceled)
|
||||
return -ECANCELED;
|
||||
return 0;
|
||||
}
|
||||
} while (ret == -ERESTARTSYS && freezing(current));
|
||||
|
||||
disable_irq_nosync(chip->vendor.irq);
|
||||
|
||||
} else {
|
||||
do {
|
||||
msleep(TPM_TIMEOUT);
|
||||
status = chip->ops->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, ret;
|
||||
struct st33zp24_dev *tpm_dev;
|
||||
|
||||
tpm_dev = (struct st33zp24_dev *)TPM_VPRIV(chip);
|
||||
|
||||
while (size < count &&
|
||||
wait_for_stat(chip,
|
||||
TPM_STS_DATA_AVAIL | TPM_STS_VALID,
|
||||
chip->vendor.timeout_c,
|
||||
&chip->vendor.read_queue, true) == 0) {
|
||||
burstcnt = get_burstcount(chip);
|
||||
if (burstcnt < 0)
|
||||
return burstcnt;
|
||||
len = min_t(int, burstcnt, count - size);
|
||||
ret = tpm_dev->ops->recv(tpm_dev->phy_id, TPM_DATA_FIFO,
|
||||
buf + size, len);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
size += len;
|
||||
}
|
||||
return size;
|
||||
}
|
||||
|
||||
/*
|
||||
* 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 st33zp24_dev *tpm_dev;
|
||||
|
||||
tpm_dev = (struct st33zp24_dev *)TPM_VPRIV(chip);
|
||||
|
||||
tpm_dev->intrs++;
|
||||
wake_up_interruptible(&chip->vendor.read_queue);
|
||||
disable_irq_nosync(chip->vendor.irq);
|
||||
|
||||
return IRQ_HANDLED;
|
||||
} /* tpm_ioserirq_handler() */
|
||||
|
||||
/*
|
||||
* st33zp24_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 st33zp24_send(struct tpm_chip *chip, unsigned char *buf,
|
||||
size_t len)
|
||||
{
|
||||
u32 status, i, size;
|
||||
int burstcnt = 0;
|
||||
int ret;
|
||||
u8 data;
|
||||
struct st33zp24_dev *tpm_dev;
|
||||
|
||||
if (!chip)
|
||||
return -EBUSY;
|
||||
if (len < TPM_HEADER_SIZE)
|
||||
return -EBUSY;
|
||||
|
||||
tpm_dev = (struct st33zp24_dev *)TPM_VPRIV(chip);
|
||||
|
||||
ret = request_locality(chip);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
status = st33zp24_status(chip);
|
||||
if ((status & TPM_STS_COMMAND_READY) == 0) {
|
||||
st33zp24_cancel(chip);
|
||||
if (wait_for_stat
|
||||
(chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
|
||||
&chip->vendor.read_queue, false) < 0) {
|
||||
ret = -ETIME;
|
||||
goto out_err;
|
||||
}
|
||||
}
|
||||
|
||||
for (i = 0; i < len - 1;) {
|
||||
burstcnt = get_burstcount(chip);
|
||||
if (burstcnt < 0)
|
||||
return burstcnt;
|
||||
size = min_t(int, len - i - 1, burstcnt);
|
||||
ret = tpm_dev->ops->send(tpm_dev->phy_id, TPM_DATA_FIFO,
|
||||
buf + i, size);
|
||||
if (ret < 0)
|
||||
goto out_err;
|
||||
|
||||
i += size;
|
||||
}
|
||||
|
||||
status = st33zp24_status(chip);
|
||||
if ((status & TPM_STS_DATA_EXPECT) == 0) {
|
||||
ret = -EIO;
|
||||
goto out_err;
|
||||
}
|
||||
|
||||
ret = tpm_dev->ops->send(tpm_dev->phy_id, TPM_DATA_FIFO,
|
||||
buf + len - 1, 1);
|
||||
if (ret < 0)
|
||||
goto out_err;
|
||||
|
||||
status = st33zp24_status(chip);
|
||||
if ((status & TPM_STS_DATA_EXPECT) != 0) {
|
||||
ret = -EIO;
|
||||
goto out_err;
|
||||
}
|
||||
|
||||
data = TPM_STS_GO;
|
||||
ret = tpm_dev->ops->send(tpm_dev->phy_id, TPM_STS, &data, 1);
|
||||
if (ret < 0)
|
||||
goto out_err;
|
||||
|
||||
return len;
|
||||
out_err:
|
||||
st33zp24_cancel(chip);
|
||||
release_locality(chip);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* st33zp24_recv received TPM response through TPM phy.
|
||||
* @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 st33zp24_recv(struct tpm_chip *chip, unsigned char *buf,
|
||||
size_t count)
|
||||
{
|
||||
int size = 0;
|
||||
int expected;
|
||||
|
||||
if (!chip)
|
||||
return -EBUSY;
|
||||
|
||||
if (count < TPM_HEADER_SIZE) {
|
||||
size = -EIO;
|
||||
goto out;
|
||||
}
|
||||
|
||||
size = recv_data(chip, buf, TPM_HEADER_SIZE);
|
||||
if (size < TPM_HEADER_SIZE) {
|
||||
dev_err(&chip->dev, "Unable to read header\n");
|
||||
goto out;
|
||||
}
|
||||
|
||||
expected = be32_to_cpu(*(__be32 *)(buf + 2));
|
||||
if (expected > count) {
|
||||
size = -EIO;
|
||||
goto out;
|
||||
}
|
||||
|
||||
size += recv_data(chip, &buf[TPM_HEADER_SIZE],
|
||||
expected - TPM_HEADER_SIZE);
|
||||
if (size < expected) {
|
||||
dev_err(&chip->dev, "Unable to read remainder of result\n");
|
||||
size = -ETIME;
|
||||
}
|
||||
|
||||
out:
|
||||
st33zp24_cancel(chip);
|
||||
release_locality(chip);
|
||||
return size;
|
||||
}
|
||||
|
||||
/*
|
||||
* st33zp24_req_canceled
|
||||
* @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h.
|
||||
* @param: status, the TPM status.
|
||||
* @return: Does TPM ready to compute a new command ? true.
|
||||
*/
|
||||
static bool st33zp24_req_canceled(struct tpm_chip *chip, u8 status)
|
||||
{
|
||||
return (status == TPM_STS_COMMAND_READY);
|
||||
}
|
||||
|
||||
static const struct tpm_class_ops st33zp24_tpm = {
|
||||
.send = st33zp24_send,
|
||||
.recv = st33zp24_recv,
|
||||
.cancel = st33zp24_cancel,
|
||||
.status = st33zp24_status,
|
||||
.req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
|
||||
.req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
|
||||
.req_canceled = st33zp24_req_canceled,
|
||||
};
|
||||
|
||||
/*
|
||||
* st33zp24_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.
|
||||
*/
|
||||
int st33zp24_probe(void *phy_id, const struct st33zp24_phy_ops *ops,
|
||||
struct device *dev, int irq, int io_lpcpd)
|
||||
{
|
||||
int ret;
|
||||
u8 intmask = 0;
|
||||
struct tpm_chip *chip;
|
||||
struct st33zp24_dev *tpm_dev;
|
||||
|
||||
chip = tpmm_chip_alloc(dev, &st33zp24_tpm);
|
||||
if (IS_ERR(chip))
|
||||
return PTR_ERR(chip);
|
||||
|
||||
tpm_dev = devm_kzalloc(dev, sizeof(struct st33zp24_dev),
|
||||
GFP_KERNEL);
|
||||
if (!tpm_dev)
|
||||
return -ENOMEM;
|
||||
|
||||
TPM_VPRIV(chip) = tpm_dev;
|
||||
tpm_dev->phy_id = phy_id;
|
||||
tpm_dev->ops = ops;
|
||||
|
||||
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 (irq) {
|
||||
/* INTERRUPT Setup */
|
||||
init_waitqueue_head(&chip->vendor.read_queue);
|
||||
tpm_dev->intrs = 0;
|
||||
|
||||
if (request_locality(chip) != LOCALITY0) {
|
||||
ret = -ENODEV;
|
||||
goto _tpm_clean_answer;
|
||||
}
|
||||
|
||||
clear_interruption(tpm_dev);
|
||||
ret = devm_request_irq(dev, irq, tpm_ioserirq_handler,
|
||||
IRQF_TRIGGER_HIGH, "TPM SERIRQ management",
|
||||
chip);
|
||||
if (ret < 0) {
|
||||
dev_err(&chip->dev, "TPM SERIRQ signals %d not available\n",
|
||||
irq);
|
||||
goto _tpm_clean_answer;
|
||||
}
|
||||
|
||||
intmask |= TPM_INTF_CMD_READY_INT
|
||||
| TPM_INTF_STS_VALID_INT
|
||||
| TPM_INTF_DATA_AVAIL_INT;
|
||||
|
||||
ret = tpm_dev->ops->send(tpm_dev->phy_id, TPM_INT_ENABLE,
|
||||
&intmask, 1);
|
||||
if (ret < 0)
|
||||
goto _tpm_clean_answer;
|
||||
|
||||
intmask = TPM_GLOBAL_INT_ENABLE;
|
||||
ret = tpm_dev->ops->send(tpm_dev->phy_id, (TPM_INT_ENABLE + 3),
|
||||
&intmask, 1);
|
||||
if (ret < 0)
|
||||
goto _tpm_clean_answer;
|
||||
|
||||
chip->vendor.irq = irq;
|
||||
|
||||
disable_irq_nosync(chip->vendor.irq);
|
||||
|
||||
tpm_gen_interrupt(chip);
|
||||
}
|
||||
|
||||
tpm_get_timeouts(chip);
|
||||
tpm_do_selftest(chip);
|
||||
|
||||
return tpm_chip_register(chip);
|
||||
_tpm_clean_answer:
|
||||
dev_info(&chip->dev, "TPM initialization fail\n");
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(st33zp24_probe);
|
||||
|
||||
/*
|
||||
* st33zp24_remove remove the TPM device
|
||||
* @param: tpm_data, the tpm phy.
|
||||
* @return: 0 in case of success.
|
||||
*/
|
||||
int st33zp24_remove(struct tpm_chip *chip)
|
||||
{
|
||||
tpm_chip_unregister(chip);
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(st33zp24_remove);
|
||||
|
||||
#ifdef CONFIG_PM_SLEEP
|
||||
/*
|
||||
* st33zp24_pm_suspend suspend the TPM device
|
||||
* @param: tpm_data, the tpm phy.
|
||||
* @param: mesg, the power management message.
|
||||
* @return: 0 in case of success.
|
||||
*/
|
||||
int st33zp24_pm_suspend(struct device *dev)
|
||||
{
|
||||
struct tpm_chip *chip = dev_get_drvdata(dev);
|
||||
struct st33zp24_dev *tpm_dev;
|
||||
int ret = 0;
|
||||
|
||||
tpm_dev = (struct st33zp24_dev *)TPM_VPRIV(chip);
|
||||
|
||||
if (gpio_is_valid(tpm_dev->io_lpcpd))
|
||||
gpio_set_value(tpm_dev->io_lpcpd, 0);
|
||||
else
|
||||
ret = tpm_pm_suspend(dev);
|
||||
|
||||
return ret;
|
||||
} /* st33zp24_pm_suspend() */
|
||||
EXPORT_SYMBOL(st33zp24_pm_suspend);
|
||||
|
||||
/*
|
||||
* st33zp24_pm_resume resume the TPM device
|
||||
* @param: tpm_data, the tpm phy.
|
||||
* @return: 0 in case of success.
|
||||
*/
|
||||
int st33zp24_pm_resume(struct device *dev)
|
||||
{
|
||||
struct tpm_chip *chip = dev_get_drvdata(dev);
|
||||
struct st33zp24_dev *tpm_dev;
|
||||
int ret = 0;
|
||||
|
||||
tpm_dev = (struct st33zp24_dev *)TPM_VPRIV(chip);
|
||||
|
||||
if (gpio_is_valid(tpm_dev->io_lpcpd)) {
|
||||
gpio_set_value(tpm_dev->io_lpcpd, 1);
|
||||
ret = wait_for_stat(chip,
|
||||
TPM_STS_VALID, chip->vendor.timeout_b,
|
||||
&chip->vendor.read_queue, false);
|
||||
} else {
|
||||
ret = tpm_pm_resume(dev);
|
||||
if (!ret)
|
||||
tpm_do_selftest(chip);
|
||||
}
|
||||
return ret;
|
||||
} /* st33zp24_pm_resume() */
|
||||
EXPORT_SYMBOL(st33zp24_pm_resume);
|
||||
#endif
|
||||
|
||||
MODULE_AUTHOR("TPM support (TPMsupport@list.st.com)");
|
||||
MODULE_DESCRIPTION("ST33ZP24 TPM 1.2 driver");
|
||||
MODULE_VERSION("1.3.0");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
|
@ -0,0 +1,34 @@
|
|||
/*
|
||||
* STMicroelectronics TPM Linux driver for TPM ST33ZP24
|
||||
* Copyright (C) 2009 - 2015 STMicroelectronics
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms and conditions of the GNU General Public License,
|
||||
* version 2, as published by the Free Software Foundation.
|
||||
*
|
||||
* 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, see <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
#ifndef __LOCAL_ST33ZP24_H__
|
||||
#define __LOCAL_ST33ZP24_H__
|
||||
|
||||
struct st33zp24_phy_ops {
|
||||
int (*send)(void *phy_id, u8 tpm_register, u8 *tpm_data, int tpm_size);
|
||||
int (*recv)(void *phy_id, u8 tpm_register, u8 *tpm_data, int tpm_size);
|
||||
};
|
||||
|
||||
#ifdef CONFIG_PM_SLEEP
|
||||
int st33zp24_pm_suspend(struct device *dev);
|
||||
int st33zp24_pm_resume(struct device *dev);
|
||||
#endif
|
||||
|
||||
int st33zp24_probe(void *phy_id, const struct st33zp24_phy_ops *ops,
|
||||
struct device *dev, int irq, int io_lpcpd);
|
||||
int st33zp24_remove(struct tpm_chip *chip);
|
||||
#endif /* __LOCAL_ST33ZP24_H__ */
|
||||
|
|
@ -1,915 +0,0 @@
|
|||
/*
|
||||
* STMicroelectronics TPM I2C Linux driver for TPM ST33ZP24
|
||||
* Copyright (C) 2009, 2010, 2014 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, see <http://www.gnu.org/licenses/>.
|
||||
*
|
||||
* STMicroelectronics version 1.2.1, Copyright (C) 2014
|
||||
* STMicroelectronics comes with ABSOLUTELY NO WARRANTY.
|
||||
* This is free software, and you are welcome to redistribute it
|
||||
* under certain conditions.
|
||||
*
|
||||
* @Author: Christophe RICARD tpmsupport@st.com
|
||||
*
|
||||
* @File: tpm_stm_st33_i2c.c
|
||||
*
|
||||
* @Synopsis:
|
||||
* 09/15/2010: First shot driver tpm_tis driver for
|
||||
* lpc is used as model.
|
||||
*/
|
||||
|
||||
#include <linux/pci.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/i2c.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/miscdevice.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/wait.h>
|
||||
#include <linux/freezer.h>
|
||||
#include <linux/string.h>
|
||||
#include <linux/interrupt.h>
|
||||
#include <linux/sysfs.h>
|
||||
#include <linux/gpio.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/uaccess.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/of_irq.h>
|
||||
#include <linux/of_gpio.h>
|
||||
|
||||
#include <linux/platform_data/tpm_stm_st33.h>
|
||||
#include "tpm.h"
|
||||
|
||||
#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
|
||||
|
||||
#define LOCALITY0 0
|
||||
|
||||
|
||||
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_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,
|
||||
};
|
||||
|
||||
struct tpm_stm_dev {
|
||||
struct i2c_client *client;
|
||||
struct tpm_chip *chip;
|
||||
u8 buf[TPM_BUFSIZE + 1];
|
||||
u32 intrs;
|
||||
int io_lpcpd;
|
||||
};
|
||||
|
||||
/*
|
||||
* write8_reg
|
||||
* Send byte to the TIS register according to the ST33ZP24 I2C protocol.
|
||||
* @param: tpm_register, the tpm tis register where the data should be written
|
||||
* @param: tpm_data, the tpm_data to write inside the tpm_register
|
||||
* @param: tpm_size, The length of the data
|
||||
* @return: Returns negative errno, or else the number of bytes written.
|
||||
*/
|
||||
static int write8_reg(struct tpm_stm_dev *tpm_dev, u8 tpm_register,
|
||||
u8 *tpm_data, u16 tpm_size)
|
||||
{
|
||||
tpm_dev->buf[0] = tpm_register;
|
||||
memcpy(tpm_dev->buf + 1, tpm_data, tpm_size);
|
||||
return i2c_master_send(tpm_dev->client, tpm_dev->buf, tpm_size + 1);
|
||||
} /* write8_reg() */
|
||||
|
||||
/*
|
||||
* read8_reg
|
||||
* Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
|
||||
* @param: tpm_register, the tpm tis register where the data should be read
|
||||
* @param: tpm_data, the TPM response
|
||||
* @param: tpm_size, tpm TPM response size to read.
|
||||
* @return: number of byte read successfully: should be one if success.
|
||||
*/
|
||||
static int read8_reg(struct tpm_stm_dev *tpm_dev, u8 tpm_register,
|
||||
u8 *tpm_data, int tpm_size)
|
||||
{
|
||||
u8 status = 0;
|
||||
u8 data;
|
||||
|
||||
data = TPM_DUMMY_BYTE;
|
||||
status = write8_reg(tpm_dev, tpm_register, &data, 1);
|
||||
if (status == 2)
|
||||
status = i2c_master_recv(tpm_dev->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_dev, 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.
|
||||
*/
|
||||
#define I2C_WRITE_DATA(tpm_dev, tpm_register, tpm_data, tpm_size) \
|
||||
(write8_reg(tpm_dev, tpm_register | \
|
||||
TPM_WRITE_DIRECTION, tpm_data, tpm_size))
|
||||
|
||||
/*
|
||||
* I2C_READ_DATA
|
||||
* Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
|
||||
* @param: tpm_dev, 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.
|
||||
*/
|
||||
#define I2C_READ_DATA(tpm_dev, tpm_register, tpm_data, tpm_size) \
|
||||
(read8_reg(tpm_dev, tpm_register, tpm_data, tpm_size))
|
||||
|
||||
/*
|
||||
* clear_interruption
|
||||
* clear the TPM interrupt register.
|
||||
* @param: tpm, the chip description
|
||||
* @return: the TPM_INT_STATUS value
|
||||
*/
|
||||
static u8 clear_interruption(struct tpm_stm_dev *tpm_dev)
|
||||
{
|
||||
u8 interrupt;
|
||||
|
||||
I2C_READ_DATA(tpm_dev, TPM_INT_STATUS, &interrupt, 1);
|
||||
I2C_WRITE_DATA(tpm_dev, TPM_INT_STATUS, &interrupt, 1);
|
||||
return interrupt;
|
||||
} /* clear_interruption() */
|
||||
|
||||
/*
|
||||
* 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 tpm_stm_dev *tpm_dev;
|
||||
u8 data;
|
||||
|
||||
tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
|
||||
|
||||
data = TPM_STS_COMMAND_READY;
|
||||
I2C_WRITE_DATA(tpm_dev, TPM_STS, &data, 1);
|
||||
} /* 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 tpm_stm_dev *tpm_dev;
|
||||
u8 data;
|
||||
|
||||
tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
|
||||
|
||||
I2C_READ_DATA(tpm_dev, TPM_STS, &data, 1);
|
||||
return data;
|
||||
} /* tpm_stm_i2c_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)
|
||||
{
|
||||
struct tpm_stm_dev *tpm_dev;
|
||||
u8 data;
|
||||
u8 status;
|
||||
|
||||
tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
|
||||
|
||||
status = I2C_READ_DATA(tpm_dev, 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 ret;
|
||||
struct tpm_stm_dev *tpm_dev;
|
||||
u8 data;
|
||||
|
||||
if (check_locality(chip) == chip->vendor.locality)
|
||||
return chip->vendor.locality;
|
||||
|
||||
tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
|
||||
|
||||
data = TPM_ACCESS_REQUEST_USE;
|
||||
ret = I2C_WRITE_DATA(tpm_dev, TPM_ACCESS, &data, 1);
|
||||
if (ret < 0)
|
||||
goto end;
|
||||
|
||||
stop = jiffies + chip->vendor.timeout_a;
|
||||
|
||||
/* Request locality is usually effective after the request */
|
||||
do {
|
||||
if (check_locality(chip) >= 0)
|
||||
return chip->vendor.locality;
|
||||
msleep(TPM_TIMEOUT);
|
||||
} while (time_before(jiffies, stop));
|
||||
ret = -EACCES;
|
||||
end:
|
||||
return ret;
|
||||
} /* request_locality() */
|
||||
|
||||
/*
|
||||
* release_locality release the active locality
|
||||
* @param: chip, the tpm chip description.
|
||||
*/
|
||||
static void release_locality(struct tpm_chip *chip)
|
||||
{
|
||||
struct tpm_stm_dev *tpm_dev;
|
||||
u8 data;
|
||||
|
||||
tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
|
||||
data = TPM_ACCESS_ACTIVE_LOCALITY;
|
||||
|
||||
I2C_WRITE_DATA(tpm_dev, 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 tpm_stm_dev *tpm_dev;
|
||||
|
||||
tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
|
||||
|
||||
stop = jiffies + chip->vendor.timeout_d;
|
||||
do {
|
||||
tpm_reg = TPM_STS + 1;
|
||||
status = I2C_READ_DATA(tpm_dev, tpm_reg, &temp, 1);
|
||||
if (status < 0)
|
||||
goto end;
|
||||
|
||||
tpm_reg = tpm_reg + 1;
|
||||
burstcnt = temp;
|
||||
status = I2C_READ_DATA(tpm_dev, 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() */
|
||||
|
||||
static bool wait_for_tpm_stat_cond(struct tpm_chip *chip, u8 mask,
|
||||
bool check_cancel, bool *canceled)
|
||||
{
|
||||
u8 status = chip->ops->status(chip);
|
||||
|
||||
*canceled = false;
|
||||
if ((status & mask) == mask)
|
||||
return true;
|
||||
if (check_cancel && chip->ops->req_canceled(chip, status)) {
|
||||
*canceled = true;
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
/*
|
||||
* interrupt_to_status
|
||||
* @param: irq_mask, the irq mask value to wait
|
||||
* @return: the corresponding tpm_sts value
|
||||
*/
|
||||
static u8 interrupt_to_status(u8 irq_mask)
|
||||
{
|
||||
u8 status = 0;
|
||||
|
||||
if ((irq_mask & TPM_INTF_STS_VALID_INT) == TPM_INTF_STS_VALID_INT)
|
||||
status |= TPM_STS_VALID;
|
||||
if ((irq_mask & TPM_INTF_DATA_AVAIL_INT) == TPM_INTF_DATA_AVAIL_INT)
|
||||
status |= TPM_STS_DATA_AVAIL;
|
||||
if ((irq_mask & TPM_INTF_CMD_READY_INT) == TPM_INTF_CMD_READY_INT)
|
||||
status |= TPM_STS_COMMAND_READY;
|
||||
|
||||
return status;
|
||||
} /* status_to_interrupt() */
|
||||
|
||||
/*
|
||||
* 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.
|
||||
* @param: check_cancel, does the command can be cancelled ?
|
||||
* @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, bool check_cancel)
|
||||
{
|
||||
unsigned long stop;
|
||||
int ret;
|
||||
bool canceled = false;
|
||||
bool condition;
|
||||
u32 cur_intrs;
|
||||
u8 interrupt, status;
|
||||
struct tpm_stm_dev *tpm_dev;
|
||||
|
||||
tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
|
||||
|
||||
/* check current status */
|
||||
status = tpm_stm_i2c_status(chip);
|
||||
if ((status & mask) == mask)
|
||||
return 0;
|
||||
|
||||
stop = jiffies + timeout;
|
||||
|
||||
if (chip->vendor.irq) {
|
||||
cur_intrs = tpm_dev->intrs;
|
||||
interrupt = clear_interruption(tpm_dev);
|
||||
enable_irq(chip->vendor.irq);
|
||||
|
||||
again:
|
||||
timeout = stop - jiffies;
|
||||
if ((long) timeout <= 0)
|
||||
return -1;
|
||||
|
||||
ret = wait_event_interruptible_timeout(*queue,
|
||||
cur_intrs != tpm_dev->intrs, timeout);
|
||||
|
||||
interrupt |= clear_interruption(tpm_dev);
|
||||
status = interrupt_to_status(interrupt);
|
||||
condition = wait_for_tpm_stat_cond(chip, mask,
|
||||
check_cancel, &canceled);
|
||||
|
||||
if (ret >= 0 && condition) {
|
||||
if (canceled)
|
||||
return -ECANCELED;
|
||||
return 0;
|
||||
}
|
||||
if (ret == -ERESTARTSYS && freezing(current)) {
|
||||
clear_thread_flag(TIF_SIGPENDING);
|
||||
goto again;
|
||||
}
|
||||
disable_irq_nosync(chip->vendor.irq);
|
||||
|
||||
} else {
|
||||
do {
|
||||
msleep(TPM_TIMEOUT);
|
||||
status = chip->ops->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, ret;
|
||||
struct tpm_stm_dev *tpm_dev;
|
||||
|
||||
tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
|
||||
|
||||
while (size < count &&
|
||||
wait_for_stat(chip,
|
||||
TPM_STS_DATA_AVAIL | TPM_STS_VALID,
|
||||
chip->vendor.timeout_c,
|
||||
&chip->vendor.read_queue, true) == 0) {
|
||||
burstcnt = get_burstcount(chip);
|
||||
if (burstcnt < 0)
|
||||
return burstcnt;
|
||||
len = min_t(int, burstcnt, count - size);
|
||||
ret = I2C_READ_DATA(tpm_dev, TPM_DATA_FIFO, buf + size, len);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
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 tpm_stm_dev *tpm_dev;
|
||||
|
||||
tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
|
||||
|
||||
tpm_dev->intrs++;
|
||||
wake_up_interruptible(&chip->vendor.read_queue);
|
||||
disable_irq_nosync(chip->vendor.irq);
|
||||
|
||||
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 status, i, size;
|
||||
int burstcnt = 0;
|
||||
int ret;
|
||||
u8 data;
|
||||
struct i2c_client *client;
|
||||
struct tpm_stm_dev *tpm_dev;
|
||||
|
||||
if (!chip)
|
||||
return -EBUSY;
|
||||
if (len < TPM_HEADER_SIZE)
|
||||
return -EBUSY;
|
||||
|
||||
tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
|
||||
client = tpm_dev->client;
|
||||
|
||||
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.read_queue, false) < 0) {
|
||||
ret = -ETIME;
|
||||
goto out_err;
|
||||
}
|
||||
}
|
||||
|
||||
for (i = 0; i < len - 1;) {
|
||||
burstcnt = get_burstcount(chip);
|
||||
if (burstcnt < 0)
|
||||
return burstcnt;
|
||||
size = min_t(int, len - i - 1, burstcnt);
|
||||
ret = I2C_WRITE_DATA(tpm_dev, TPM_DATA_FIFO, buf + i, 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(tpm_dev, 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(tpm_dev, 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)
|
||||
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->pdev, "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->pdev, "Unable to read remainder of result\n");
|
||||
size = -ETIME;
|
||||
goto out;
|
||||
}
|
||||
|
||||
out:
|
||||
chip->ops->cancel(chip);
|
||||
release_locality(chip);
|
||||
return size;
|
||||
}
|
||||
|
||||
static bool tpm_stm_i2c_req_canceled(struct tpm_chip *chip, u8 status)
|
||||
{
|
||||
return (status == TPM_STS_COMMAND_READY);
|
||||
}
|
||||
|
||||
static const struct tpm_class_ops 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_stm_i2c_req_canceled,
|
||||
};
|
||||
|
||||
#ifdef CONFIG_OF
|
||||
static int tpm_stm_i2c_of_request_resources(struct tpm_chip *chip)
|
||||
{
|
||||
struct device_node *pp;
|
||||
struct tpm_stm_dev *tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
|
||||
struct i2c_client *client = tpm_dev->client;
|
||||
int gpio;
|
||||
int ret;
|
||||
|
||||
pp = client->dev.of_node;
|
||||
if (!pp) {
|
||||
dev_err(chip->pdev, "No platform data\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
/* Get GPIO from device tree */
|
||||
gpio = of_get_named_gpio(pp, "lpcpd-gpios", 0);
|
||||
if (gpio < 0) {
|
||||
dev_err(chip->pdev, "Failed to retrieve lpcpd-gpios from dts.\n");
|
||||
tpm_dev->io_lpcpd = -1;
|
||||
/*
|
||||
* lpcpd pin is not specified. This is not an issue as
|
||||
* power management can be also managed by TPM specific
|
||||
* commands. So leave with a success status code.
|
||||
*/
|
||||
return 0;
|
||||
}
|
||||
/* GPIO request and configuration */
|
||||
ret = devm_gpio_request_one(&client->dev, gpio,
|
||||
GPIOF_OUT_INIT_HIGH, "TPM IO LPCPD");
|
||||
if (ret) {
|
||||
dev_err(chip->pdev, "Failed to request lpcpd pin\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
tpm_dev->io_lpcpd = gpio;
|
||||
|
||||
return 0;
|
||||
}
|
||||
#else
|
||||
static int tpm_stm_i2c_of_request_resources(struct tpm_chip *chip)
|
||||
{
|
||||
return -ENODEV;
|
||||
}
|
||||
#endif
|
||||
|
||||
static int tpm_stm_i2c_request_resources(struct i2c_client *client,
|
||||
struct tpm_chip *chip)
|
||||
{
|
||||
struct st33zp24_platform_data *pdata;
|
||||
struct tpm_stm_dev *tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
|
||||
int ret;
|
||||
|
||||
pdata = client->dev.platform_data;
|
||||
if (!pdata) {
|
||||
dev_err(chip->pdev, "No platform data\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
/* store for late use */
|
||||
tpm_dev->io_lpcpd = pdata->io_lpcpd;
|
||||
|
||||
if (gpio_is_valid(pdata->io_lpcpd)) {
|
||||
ret = devm_gpio_request_one(&client->dev,
|
||||
pdata->io_lpcpd, GPIOF_OUT_INIT_HIGH,
|
||||
"TPM IO_LPCPD");
|
||||
if (ret) {
|
||||
dev_err(chip->pdev, "%s : reset gpio_request failed\n",
|
||||
__FILE__);
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* tpm_stm_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_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
|
||||
{
|
||||
int ret;
|
||||
u8 intmask = 0;
|
||||
struct tpm_chip *chip;
|
||||
struct st33zp24_platform_data *platform_data;
|
||||
struct tpm_stm_dev *tpm_dev;
|
||||
|
||||
if (!client) {
|
||||
pr_info("%s: i2c client is NULL. Device not accessible.\n",
|
||||
__func__);
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
|
||||
dev_info(&client->dev, "client not i2c capable\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
tpm_dev = devm_kzalloc(&client->dev, sizeof(struct tpm_stm_dev),
|
||||
GFP_KERNEL);
|
||||
if (!tpm_dev)
|
||||
return -ENOMEM;
|
||||
|
||||
chip = tpmm_chip_alloc(&client->dev, &st_i2c_tpm);
|
||||
if (IS_ERR(chip))
|
||||
return PTR_ERR(chip);
|
||||
|
||||
TPM_VPRIV(chip) = tpm_dev;
|
||||
tpm_dev->client = client;
|
||||
|
||||
platform_data = client->dev.platform_data;
|
||||
if (!platform_data && client->dev.of_node) {
|
||||
ret = tpm_stm_i2c_of_request_resources(chip);
|
||||
if (ret)
|
||||
goto _tpm_clean_answer;
|
||||
} else if (platform_data) {
|
||||
ret = tpm_stm_i2c_request_resources(client, chip);
|
||||
if (ret)
|
||||
goto _tpm_clean_answer;
|
||||
}
|
||||
|
||||
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 (client->irq) {
|
||||
/* INTERRUPT Setup */
|
||||
init_waitqueue_head(&chip->vendor.read_queue);
|
||||
tpm_dev->intrs = 0;
|
||||
|
||||
if (request_locality(chip) != LOCALITY0) {
|
||||
ret = -ENODEV;
|
||||
goto _tpm_clean_answer;
|
||||
}
|
||||
|
||||
clear_interruption(tpm_dev);
|
||||
ret = devm_request_irq(&client->dev, client->irq,
|
||||
tpm_ioserirq_handler,
|
||||
IRQF_TRIGGER_HIGH,
|
||||
"TPM SERIRQ management", chip);
|
||||
if (ret < 0) {
|
||||
dev_err(chip->pdev, "TPM SERIRQ signals %d not available\n",
|
||||
client->irq);
|
||||
goto _tpm_clean_answer;
|
||||
}
|
||||
|
||||
intmask |= TPM_INTF_CMD_READY_INT
|
||||
| TPM_INTF_STS_VALID_INT
|
||||
| TPM_INTF_DATA_AVAIL_INT;
|
||||
|
||||
ret = I2C_WRITE_DATA(tpm_dev, TPM_INT_ENABLE, &intmask, 1);
|
||||
if (ret < 0)
|
||||
goto _tpm_clean_answer;
|
||||
|
||||
intmask = TPM_GLOBAL_INT_ENABLE;
|
||||
ret = I2C_WRITE_DATA(tpm_dev, (TPM_INT_ENABLE + 3),
|
||||
&intmask, 1);
|
||||
if (ret < 0)
|
||||
goto _tpm_clean_answer;
|
||||
|
||||
chip->vendor.irq = client->irq;
|
||||
|
||||
disable_irq_nosync(chip->vendor.irq);
|
||||
|
||||
tpm_gen_interrupt(chip);
|
||||
}
|
||||
|
||||
tpm_get_timeouts(chip);
|
||||
tpm_do_selftest(chip);
|
||||
|
||||
return tpm_chip_register(chip);
|
||||
_tpm_clean_answer:
|
||||
dev_info(chip->pdev, "TPM I2C initialisation fail\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* tpm_stm_i2c_remove remove the TPM device
|
||||
* @param: client, the i2c_client description (TPM I2C description).
|
||||
* @return: 0 in case of success.
|
||||
*/
|
||||
static int tpm_stm_i2c_remove(struct i2c_client *client)
|
||||
{
|
||||
struct tpm_chip *chip =
|
||||
(struct tpm_chip *) i2c_get_clientdata(client);
|
||||
|
||||
if (chip)
|
||||
tpm_chip_unregister(chip);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM_SLEEP
|
||||
/*
|
||||
* tpm_stm_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.
|
||||
*/
|
||||
static int tpm_stm_i2c_pm_suspend(struct device *dev)
|
||||
{
|
||||
struct tpm_chip *chip = dev_get_drvdata(dev);
|
||||
struct tpm_stm_dev *tpm_dev;
|
||||
int ret = 0;
|
||||
|
||||
tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
|
||||
|
||||
if (gpio_is_valid(tpm_dev->io_lpcpd))
|
||||
gpio_set_value(tpm_dev->io_lpcpd, 0);
|
||||
else
|
||||
ret = tpm_pm_suspend(dev);
|
||||
|
||||
return ret;
|
||||
} /* tpm_stm_i2c_suspend() */
|
||||
|
||||
/*
|
||||
* tpm_stm_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_stm_i2c_pm_resume(struct device *dev)
|
||||
{
|
||||
struct tpm_chip *chip = dev_get_drvdata(dev);
|
||||
struct tpm_stm_dev *tpm_dev;
|
||||
int ret = 0;
|
||||
|
||||
tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
|
||||
|
||||
if (gpio_is_valid(tpm_dev->io_lpcpd)) {
|
||||
gpio_set_value(tpm_dev->io_lpcpd, 1);
|
||||
ret = wait_for_stat(chip,
|
||||
TPM_STS_VALID, chip->vendor.timeout_b,
|
||||
&chip->vendor.read_queue, false);
|
||||
} else {
|
||||
ret = tpm_pm_resume(dev);
|
||||
if (!ret)
|
||||
tpm_do_selftest(chip);
|
||||
}
|
||||
return ret;
|
||||
} /* tpm_stm_i2c_pm_resume() */
|
||||
#endif
|
||||
|
||||
static const struct i2c_device_id tpm_stm_i2c_id[] = {
|
||||
{TPM_ST33_I2C, 0},
|
||||
{}
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, tpm_stm_i2c_id);
|
||||
|
||||
#ifdef CONFIG_OF
|
||||
static const struct of_device_id of_st33zp24_i2c_match[] = {
|
||||
{ .compatible = "st,st33zp24-i2c", },
|
||||
{}
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, of_st33zp24_i2c_match);
|
||||
#endif
|
||||
|
||||
static SIMPLE_DEV_PM_OPS(tpm_stm_i2c_ops, tpm_stm_i2c_pm_suspend,
|
||||
tpm_stm_i2c_pm_resume);
|
||||
|
||||
static struct i2c_driver tpm_stm_i2c_driver = {
|
||||
.driver = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = TPM_ST33_I2C,
|
||||
.pm = &tpm_stm_i2c_ops,
|
||||
.of_match_table = of_match_ptr(of_st33zp24_i2c_match),
|
||||
},
|
||||
.probe = tpm_stm_i2c_probe,
|
||||
.remove = tpm_stm_i2c_remove,
|
||||
.id_table = tpm_stm_i2c_id
|
||||
};
|
||||
|
||||
module_i2c_driver(tpm_stm_i2c_driver);
|
||||
|
||||
MODULE_AUTHOR("Christophe Ricard (tpmsupport@st.com)");
|
||||
MODULE_DESCRIPTION("STM TPM I2C ST33 Driver");
|
||||
MODULE_VERSION("1.2.1");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
|
@ -1,6 +1,6 @@
|
|||
/*
|
||||
* STMicroelectronics TPM I2C Linux driver for TPM ST33ZP24
|
||||
* Copyright (C) 2009, 2010 STMicroelectronics
|
||||
* STMicroelectronics TPM Linux driver for TPM 1.2 ST33ZP24
|
||||
* Copyright (C) 2009 - 2015 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
|
||||
|
|
@ -14,20 +14,9 @@
|
|||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, see <http://www.gnu.org/licenses/>.
|
||||
*
|
||||
* 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@st.com
|
||||
*
|
||||
* @File: stm_st33_tpm.h
|
||||
*
|
||||
* @Date: 09/15/2010
|
||||
*/
|
||||
#ifndef __STM_ST33_TPM_H__
|
||||
#define __STM_ST33_TPM_H__
|
||||
#ifndef __ST33ZP24_H__
|
||||
#define __ST33ZP24_H__
|
||||
|
||||
#define TPM_ST33_I2C "st33zp24-i2c"
|
||||
#define TPM_ST33_SPI "st33zp24-spi"
|
||||
|
|
@ -36,4 +25,4 @@ struct st33zp24_platform_data {
|
|||
int io_lpcpd;
|
||||
};
|
||||
|
||||
#endif /* __STM_ST33_TPM_H__ */
|
||||
#endif /* __ST33ZP24_H__ */
|
||||
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