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    SubjectRe: [tpmdd-devel] [PATCH 1/1] TPM: STMicroelectronics st33 driver SPI
    On Mon, Apr 22, 2013 at 10:50:06AM +0200, Mathias Leblanc wrote:
    > * STMicroelectronics version 1.2.0, Copyright (C) 2010
    > * STMicroelectronics comes with ABSOLUTELY NO WARRANTY.
    > * This is free software, and you are welcome to redistribute it
    > * under certain conditions.
    >
    > This is the driver for TPM chip from ST Microelectronics.
    >
    > If you have a TPM security chip from STMicroelectronics working with
    > an SPI, in menuconfig or .config choose the tpm driver on
    > device --> tpm and activate the protocol of your choice before compiling
    > the kernel.
    > The driver will be accessible from within Linux.
    >
    > Tested on linux x86/x64 and beagleboard REV B & XM REV C
    >
    > Signed-off-by: Mathias Leblanc <mathias.leblanc@st.com>
    > ---
    > drivers/char/tpm/Kconfig | 10 +
    > drivers/char/tpm/Makefile | 1 +
    > drivers/char/tpm/tpm_spi_stm_st33.c | 1027 +++++++++++++++++++++++++++++++++++
    > drivers/char/tpm/tpm_spi_stm_st33.h | 86 +++
    > 4 files changed, 1124 insertions(+), 0 deletions(-)
    > create mode 100644 drivers/char/tpm/tpm_spi_stm_st33.c
    > create mode 100644 drivers/char/tpm/tpm_spi_stm_st33.h
    >
    > diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
    > index dbfd564..2fc1254 100644
    > --- a/drivers/char/tpm/Kconfig
    > +++ b/drivers/char/tpm/Kconfig
    > @@ -91,4 +91,14 @@ config TCG_ST33_I2C
    > To compile this driver as a module, choose M here; the module will be
    > called tpm_stm_st33_i2c.
    >
    > +config TCG_ST33_SPI
    > + tristate "STMicroelectronics ST33 SPI"
    > + depends on SPI
    > + depends on GPIOLIB
    > + ---help---
    > + If you have a TPM security chip from STMicroelectronics working with
    > + an SPI bus say Yes and it will be accessible from within Linux.
    > + To compile this driver as a module, choose M here; the module will be
    > + called tpm_stm_st33_spi.
    > +
    > endif # TCG_TPM
    > diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile
    > index a3736c9..a1db3dd 100644
    > --- a/drivers/char/tpm/Makefile
    > +++ b/drivers/char/tpm/Makefile
    > @@ -18,3 +18,4 @@ obj-$(CONFIG_TCG_ATMEL) += tpm_atmel.o
    > obj-$(CONFIG_TCG_INFINEON) += tpm_infineon.o
    > obj-$(CONFIG_TCG_IBMVTPM) += tpm_ibmvtpm.o
    > obj-$(CONFIG_TCG_ST33_I2C) += tpm_i2c_stm_st33.o
    > +obj-$(CONFIG_TCG_ST33_SPI) += tpm_spi_stm_st33.o
    > diff --git a/drivers/char/tpm/tpm_spi_stm_st33.c b/drivers/char/tpm/tpm_spi_stm_st33.c
    > new file mode 100644
    > index 0000000..70828dc
    > --- /dev/null
    > +++ b/drivers/char/tpm/tpm_spi_stm_st33.c
    > @@ -0,0 +1,1028 @@
    > +/*
    > + * STMicroelectronics TPM SPI Linux driver for TPM ST33ZP24
    > + * Copyright (C) 2009, 2010 STMicroelectronics
    > + *
    > + * This program is free software; you can redistribute it and/or modify
    > + * it under the terms of the GNU General Public License as published by
    > + * the Free Software Foundation; either version 2 of the License, or
    > + * (at your option) any later version.
    > + *
    > + * This program is distributed in the hope that it will be useful,
    > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    > + * GNU General Public License for more details.
    > + *
    > + * You should have received a copy of the GNU General Public License along
    > + * with this program; if not, write to the Free Software Foundation, Inc.,
    > + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
    > + *
    > + * STMicroelectronics version 1.2.0, Copyright (C) 2010
    > + * STMicroelectronics comes with ABSOLUTELY NO WARRANTY.
    > + * This is free software, and you are welcome to redistribute it
    > + * under certain conditions.
    > + *
    > + * @Author: Christophe RICARD tpmsupport@st.com
    > + *
    > + * @File: tpm_stm_st33_spi.c
    > + *
    > + * @Synopsis:
    > + * 09/15/2010: First shot driver tpm_tis driver for lpc is
    > + * used as model.
    > + */
    > +
    > +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
    > +
    > +#include <linux/module.h>
    > +#include <linux/kernel.h>
    > +#include <linux/delay.h>
    > +#include <linux/init.h>
    > +#include <linux/spi/spi.h>
    > +#include <linux/wait.h>
    > +#include <linux/string.h>
    > +#include <linux/interrupt.h>
    > +#include <linux/spinlock.h>
    > +#include <linux/sysfs.h>
    > +#include <linux/gpio.h>
    > +#include <linux/sched.h>
    > +#include <linux/uaccess.h>
    > +#include <linux/io.h>
    > +#include <linux/slab.h>
    > +#include <linux/sched.h>
    > +
    > +#include "tpm.h"
    > +
    > +#include "tpm_spi_stm_st33.h"
    > +
    > +enum stm33zp24_access {
    > + TPM_ACCESS_VALID = 0x80,
    > + TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
    > + TPM_ACCESS_REQUEST_PENDING = 0x04,
    > + TPM_ACCESS_REQUEST_USE = 0x02,
    > +};
    > +
    > +enum stm33zp24_status {
    > + TPM_STS_VALID = 0x80,
    > + TPM_STS_COMMAND_READY = 0x40,
    > + TPM_STS_GO = 0x20,
    > + TPM_STS_DATA_AVAIL = 0x10,
    > + TPM_STS_DATA_EXPECT = 0x08,
    > +};
    > +
    > +enum stm33zp24_int_flags {
    > + TPM_GLOBAL_INT_ENABLE = 0x80,
    > + TPM_INTF_CMD_READY_INT = 0x080,
    > + TPM_INTF_FIFO_AVALAIBLE_INT = 0x040,
    > + TPM_INTF_WAKE_UP_READY_INT = 0x020,
    > + TPM_INTF_LOC4SOFTRELEASE_INT = 0x008,
    > + TPM_INTF_LOCALITY_CHANGE_INT = 0x004,
    > + TPM_INTF_STS_VALID_INT = 0x002,
    > + TPM_INTF_DATA_AVAIL_INT = 0x001,
    > +};
    > +
    > +enum tis_defaults {
    > + TIS_SHORT_TIMEOUT = 750, /* ms */
    > + TIS_LONG_TIMEOUT = 2000, /* 2 sec */
    > +};
    > +
    > +/*
    > + * write8_reg
    > + * Send byte to the TIS register according to the ST33ZP24 SPI protocol.
    > + * @param: tpm, the chip description
    > + * @param: tpm_register, the tpm tis register where the data should be written
    > + * @param: tpm_data, the tpm_data to write inside the tpm_register
    > + * @param: tpm_size, The length of the data
    > + * @return: should be zero if success else a negative error code.
    > + */
    > +static int write8_reg(struct tpm_chip *tpm, u8 tpm_register,
    > + u8 *tpm_data, u16 tpm_size)
    > +{
    > + u8 data;
    > + int total_length = 0, nbr_dummy_bytes;
    > + int value = 0;
    > + struct spi_device *dev = (struct spi_device *)tpm->vendor.iobase;
    > + struct st33zp24_platform_data *platform_data = dev->dev.platform_data;
    > + u8 *data_buffer = platform_data->tpm_spi_buffer[0];
    > + struct spi_transfer xfer = {
    > + .tx_buf = data_buffer,
    > + .rx_buf = platform_data->tpm_spi_buffer[1],
    > + };
    > + struct spi_message msg;
    > + u8 latency = platform_data->latency + tpm_size + 1;
    > +
    > + /* Pre-Header */
    > + data = TPM_WRITE_DIRECTION | tpm->vendor.locality;
    > + memcpy(data_buffer + total_length, &data, sizeof(data));
    > + total_length++;
    > + data = tpm_register;
    > + memcpy(data_buffer + total_length, &data, sizeof(data));
    > + total_length++;
    > +
    > + if (tpm_size > 0 &&
    > + (tpm_register == TPM_DATA_FIFO ||
    > + tpm_register == TPM_HASH_DATA)) {
    > + data = (tpm_size >> 8) & 0x00ff;
    > + data_buffer[total_length++] = data;
    > + data = tpm_size & 0x00ff;
    > + data_buffer[total_length++] = data;
    > + latency -= 2;
    > + }
    > +
    > + memcpy(&data_buffer[total_length], tpm_data, tpm_size);
    > + total_length += tpm_size;
    > +
    > + nbr_dummy_bytes = platform_data->latency + 1;
    > + memset(&data_buffer[total_length], TPM_DUMMY_BYTE,
    > + platform_data->latency + 1);
    > +
    > + xfer.len = total_length;
    > + spi_message_init(&msg);
    > + spi_message_add_tail(&xfer, &msg);
    > + value = spi_sync(dev, &msg);
    > +
    > + if (value == 0) {
    > + nbr_dummy_bytes = total_length - 1 - nbr_dummy_bytes;
    > + for (; nbr_dummy_bytes < total_length &&
    > + ((u8 *)xfer.rx_buf)[nbr_dummy_bytes] == 0;
    > + nbr_dummy_bytes++)
    > + ;
    > +
    > + if (((u8 *)xfer.rx_buf)[nbr_dummy_bytes] != 0)
    > + value = ((u8 *)xfer.rx_buf)[nbr_dummy_bytes];
    > + }
    > +
    > + return value;
    > +} /* write8_reg() */
    > +
    > +/*
    > + * read8_reg
    > + * Recv byte from the TIS register according to the ST33ZP24 SPI protocol.
    > + * @param: tpm, the chip description
    > + * @param: tpm_register, the tpm tis register where the data should be read
    > + * @param: tpm_data, the TPM response
    > + * @param: tpm_size, tpm TPM response size to read.
    > + * @return: should be zero if success else a negative error code.
    > + */
    > +static u8 read8_reg(struct tpm_chip *tpm, u8 tpm_register,
    > + u8 *tpm_data, u16 tpm_size)
    > +{
    > + u8 data;
    > + int total_length = 0, nbr_dummy_bytes;
    > + int value = 0;
    > + struct spi_device *dev = (struct spi_device *)tpm->vendor.iobase;
    > + struct st33zp24_platform_data *platform_data = dev->dev.platform_data;
    > + u8 *data_buffer = platform_data->tpm_spi_buffer[0];
    > + struct spi_transfer xfer = {
    > + .tx_buf = data_buffer,
    > + .rx_buf = platform_data->tpm_spi_buffer[1],
    > + };
    > + struct spi_message msg;
    > +
    > + u8 latency = platform_data->latency + tpm_size + 1;
    > +
    > + /* Pre-Header */
    > +
    > + data = tpm->vendor.locality;
    > + memcpy(data_buffer + total_length, &data, sizeof(data));
    > + total_length++;
    > + data = tpm_register;
    > + memcpy(data_buffer + total_length, &data, sizeof(data));
    > + total_length++;
    > +
    > + nbr_dummy_bytes = platform_data->latency + 1;
    > + memset(&data_buffer[total_length], TPM_DUMMY_BYTE,
    > + platform_data->latency + 1);
    > +
    > + xfer.len = total_length;
    > +
    > + /* header + status byte + size of the data + status byte */
    > + spi_message_init(&msg);
    > + spi_message_add_tail(&xfer, &msg);
    > + value = spi_sync(dev, &msg);
    > +
    > + if (tpm_size > 0 && value == 0) {
    > + nbr_dummy_bytes = 2;
    > + for (; nbr_dummy_bytes < total_length &&
    > + ((u8 *)xfer.rx_buf)[nbr_dummy_bytes] == 0;
    > + nbr_dummy_bytes++)
    > + ;
    > +
    > + if (nbr_dummy_bytes + 1 < total_length) {
    > + value = ((u8 *)xfer.rx_buf)[nbr_dummy_bytes];
    > +
    > + if (tpm_size > 0)
    > + memcpy(tpm_data, xfer.rx_buf +
    > + nbr_dummy_bytes + 1,
    > + tpm_size);
    > + }
    > + }
    > + return value;
    > +} /* read8_reg() */
    > +
    > +/*
    > + * SPI_WRITE_DATA
    > + * Send byte to the TIS register according to the ST33ZP24 SPI protocol.
    > + * @param: tpm, the chip description
    > + * @param: tpm_register, the tpm tis register where the data should be written
    > + * @param: tpm_data, the tpm_data to write inside the tpm_register
    > + * @param: tpm_size, The length of the data
    > + * @return: should be zero if success else the negative error code.
    > + */
    > +static u32 SPI_WRITE_DATA(struct tpm_chip *tpm, u8 tpm_register,
    > + u8 *tpm_data, u16 tpm_size)
    > +{
    > + u8 value = 0;
    > + value = write8_reg(tpm, tpm_register, tpm_data, tpm_size);
    > +
    > + switch (value) {
    > + case TPM_ST_SPI_OK:
    > + return TPM_ST_SPI_OK;
    > + case 0:
    > + return 0;
    > + default:
    > + return -EBUSY;
    > + }
    > +} /* SPI_WRITE_DATA() */
    > +
    > +/*
    > + * SPI_READ_DATA

    Still need this as lower case, and SPI_WRITE_DATA...

    > + * Recv byte from the TIS register according to the ST33ZP24 SPI protocol.
    > + * @param: tpm, the chip description
    > + * @param: tpm_register, the tpm tis register where the data should be read
    > + * @param: tpm_data, the TPM response
    > + * @param: tpm_size, tpm TPM response size to read.
    > + * @return: should be zero if success else the negative error code.
    > + */
    > +static u32 SPI_READ_DATA(struct tpm_chip *tpm, u8 tpm_register,
    > + u8 *tpm_data, u16 tpm_size)
    > +{
    > + u8 value = 0;
    > +
    > + value = read8_reg(tpm, tpm_register, tpm_data, tpm_size);
    > +
    > + switch (value) {
    > + case TPM_ST_SPI_OK:
    > + return TPM_ST_SPI_OK;
    > + case 0:
    > + return 0;
    > + default:
    > + return -EBUSY;
    > + }
    > +} /* SPI_READ_DATA () */
    > +
    > +/*
    > + * clear_interruption
    > + * clear the TPM interrupt register.
    > + * @param: tpm, the chip description
    > + */
    > +static void clear_interruption(struct tpm_chip *tpm)
    > +{
    > + u8 interrupt;
    > + SPI_READ_DATA(tpm, TPM_INT_STATUS, &interrupt, 1);
    > + /* Clear interrupts handled with TPM_EOI */
    > + SPI_WRITE_DATA(tpm, TPM_INT_STATUS, &interrupt, 1);
    > + SPI_READ_DATA(tpm, TPM_INT_STATUS, &interrupt, 1);
    > +} /* clear_interruption() */
    > +
    > +/*
    > + * _wait_for_interrupt_serirq_timeout
    > + * @param: tpm, the chip description
    > + * @param: timeout, the timeout of the interrupt
    > + * @return: the status of the interruption.
    > + */
    > +static int _wait_for_interrupt_serirq_timeout(struct tpm_chip *chip,
    > + unsigned long timeout)
    > +{
    > + unsigned long status;
    > + struct spi_device *client;
    > + struct st33zp24_platform_data *pin_infos;
    > +
    > + client = (struct spi_device *)chip->vendor.iobase;
    > + pin_infos = client->dev.platform_data;
    > +
    > + status = wait_for_completion_interruptible_timeout(
    > + &pin_infos->irq_detection, timeout);
    > + if (status > 0)
    > + enable_irq(gpio_to_irq(pin_infos->io_serirq));
    > + gpio_direction_input(pin_infos->io_serirq);
    > +
    > + return status;
    > +} /* wait_for_interrupt_serirq_timeout() */
    > +
    > +unsigned long wait_for_serirq_timeout(struct tpm_chip *chip, bool condition,
    > + unsigned long timeout)
    > +{
    > + unsigned long status = 0;
    > +
    > + status = _wait_for_interrupt_serirq_timeout(chip, timeout);
    > + if (!status) {
    > + status = -EBUSY;
    > + goto wait_end;
    > + }
    > + clear_interruption(chip);
    > + if (condition)
    > + status = 1;
    > +
    > +wait_end:
    > + return status;
    > +}
    > +
    > +
    > +/*
    > + * tpm_stm_spi_cancel, cancel is not implemented.
    > + * @param: chip, the tpm chip description as specified in
    > + * driver/char/tpm/tpm.h.
    > + */
    > +static void tpm_stm_spi_cancel(struct tpm_chip *chip)
    > +{
    > + u8 data = TPM_STS_COMMAND_READY;
    > +
    > + /* this causes the current command to be aborted */
    > + SPI_WRITE_DATA(chip, TPM_STS, &data, 1);
    > +} /* tpm_stm_spi_cancel() */
    > +
    > +/*
    > + * tpm_stm_spi_status return the TPM_STS register
    > + * @param: chip, the tpm chip description
    > + * @return: the TPM_STS register value.
    > + */
    > +static u8 tpm_stm_spi_status(struct tpm_chip *chip)
    > +{
    > + u8 data;
    > +
    > + SPI_READ_DATA(chip, TPM_STS, &data, 1);
    > + return data;
    > +} /* tpm_stm_spi_status() */
    > +
    > +
    > +
    > +/*
    > + * check_locality if the locality is active
    > + * @param: chip, the tpm chip description
    > + * @return: the active locality or -EACCESS.
    > + */
    > +static int check_locality(struct tpm_chip *chip)
    > +{
    > + u8 data;
    > + u8 status;
    > +
    > + status = SPI_READ_DATA(chip, TPM_ACCESS, &data, 1);
    > + if (status && (data &
    > + (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
    > + (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
    > + return chip->vendor.locality;
    > +
    > + return -EACCES;
    > +} /* check_locality() */
    > +
    > +/*
    > + * request_locality request the TPM locality
    > + * @param: chip, the chip description
    > + * @return: the active locality or EACCESS.
    > + */
    > +static int request_locality(struct tpm_chip *chip)
    > +{
    > + unsigned long stop;
    > + long rc;
    > + u8 data;
    > +
    > + /* Check locality */
    > + if (check_locality(chip) == chip->vendor.locality)
    > + return chip->vendor.locality;
    > +
    > + /* Request locality */
    > + data = TPM_ACCESS_REQUEST_USE;
    > + rc = SPI_WRITE_DATA(chip, TPM_ACCESS, &data, 1);
    > + if (rc < 0)
    > + goto end;
    > +
    > + /* wait for burstcount */
    > + if (chip->vendor.irq) {
    > + rc = wait_for_serirq_timeout(chip, (check_locality
    > + (chip) >= 0),
    > + chip->vendor.timeout_a);
    > + if (rc > 0)
    > + return chip->vendor.locality;
    > + } else {
    > + stop = jiffies + chip->vendor.timeout_a;
    > + do {
    > + if (check_locality(chip) >= 0)
    > + return chip->vendor.locality;
    > + msleep(TPM_TIMEOUT);
    > + } while (time_before(jiffies, stop));
    > + }
    > +end:
    > + return -EACCES;
    > +} /* request_locality() */
    > +
    > +/*
    > + * release_locality release the active locality
    > + * @param: chip, the tpm chip description.
    > + */
    > +static void release_locality(struct tpm_chip *chip)
    > +{
    > + u8 data;
    > +
    > + data = TPM_ACCESS_ACTIVE_LOCALITY;
    > + SPI_WRITE_DATA(chip, TPM_ACCESS, &data, 1);
    > +} /* release_locality()*/
    > +
    > +/*
    > + * get_burstcount return the burstcount address 0x19 0x1A
    > + * @param: chip, the chip description
    > + * return: the burstcount.
    > + */
    > +static int get_burstcount(struct tpm_chip *chip)
    > +{
    > + unsigned long stop;
    > + u32 burstcnt, status;
    > + u8 tpm_reg, temp;
    > +
    > + /* wait for burstcount */
    > + /* which timeout value, spec has 2 answers (c & d) */
    > + stop = jiffies + chip->vendor.timeout_d;
    > + do {
    > + tpm_reg = TPM_STS + 1;
    > + status = SPI_READ_DATA(chip, tpm_reg, &temp, 1);
    > + if (status < 0)
    > + goto end;
    > +
    > + tpm_reg = tpm_reg + 1;
    > + burstcnt = temp;
    > + status = SPI_READ_DATA(chip, tpm_reg, &temp, 1);
    > + if (status < 0)
    > + goto end;
    > +
    > + burstcnt |= temp << 8;
    > + if (burstcnt)
    > + return burstcnt;
    > + msleep(TPM_TIMEOUT);
    > + } while (time_before(jiffies, stop));
    > +
    > +end:
    > + return -EBUSY;
    > +} /* get_burstcount() */
    > +
    > +/*
    > + * wait_for_stat wait for a TPM_STS value
    > + * @param: chip, the tpm chip description
    > + * @param: mask, the value mask to wait
    > + * @param: timeout, the timeout
    > + * @param: queue, the wait queue.
    > + * @return: the tpm status, 0 if success, -ETIME if timeout is reached.
    > + */
    > +static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
    > + wait_queue_head_t *queue)
    > +{
    > + unsigned long stop;
    > + long rc;
    > + u8 status;
    > +
    > + /* check current status */
    > + status = tpm_stm_spi_status(chip);
    > + if (!chip->vendor.irq && (status & mask) == mask)
    > + return 0;
    > +
    > + if (chip->vendor.irq) {
    > + rc = wait_for_serirq_timeout(chip, ((tpm_stm_spi_status
    > + (chip) & mask) ==
    > + mask), timeout);
    > + if (rc > 0)
    > + return 0;
    > + } else {
    > + stop = jiffies + timeout;
    > + do {
    > + msleep(TPM_TIMEOUT);
    > + status = tpm_stm_spi_status(chip);
    > + if ((status & mask) == mask)
    > + return 0;
    > + } while (time_before(jiffies, stop));
    > + }
    > + return -ETIME;
    > +} /* wait_for_stat() */
    > +
    > +/*
    > + * recv_data receive data
    > + * @param: chip, the tpm chip description
    > + * @param: buf, the buffer where the data are received
    > + * @param: count, the number of data to receive
    > + * @return: the tpm status, 0 if success, -ETIME if timeout is reached.
    > + */
    > +static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
    > +{
    > + u32 size = 0, burstcnt, status, len;
    > +
    > + while (size < count &&
    > + wait_for_stat(chip,
    > + TPM_STS_DATA_AVAIL | TPM_STS_VALID,
    > + chip->vendor.timeout_c,
    > + &chip->vendor.read_queue)
    > + == 0) {
    > + burstcnt = get_burstcount(chip);
    > + len = min_t(int, burstcnt, count - size);

    burstcnt as -EBUSY still needs checking.

    > + status = SPI_READ_DATA(chip, TPM_DATA_FIFO, buf + size, len);
    > + if (status < 0)
    > + return status;
    > +
    > +
    > + size += len;
    > + }
    > + return size;
    > +}
    > +
    > +/*
    > + * tpm_ioserirq_handler the serirq irq handler
    > + * @param: irq, the tpm chip description
    > + * @param: dev_id, the description of the chip
    > + * @return: the status of the handler.
    > + */
    > +static irqreturn_t tpm_ioserirq_handler(int irq, void *dev_id)
    > +{
    > + struct tpm_chip *chip = dev_id;
    > + struct spi_device *client;
    > + struct st33zp24_platform_data *pin_infos;
    > +
    > + disable_irq_nosync(irq);
    > +
    > + client = (struct spi_device *)chip->vendor.iobase;
    > + pin_infos = client->dev.platform_data;
    > +
    > + complete(&pin_infos->irq_detection);
    > + return IRQ_HANDLED;
    > +} /* tpm_ioserirq_handler() */
    > +
    > +/*
    > + * tpm_stm_spi_send send TPM commands through the SPI bus.
    > + * @param: chip, the tpm chip description
    > + * @param: buf, the tpm command buffer
    > + * @param: len, the tpm command size
    > + * @return: should be zero if success else the negative error code.
    > + */
    > +static int tpm_stm_spi_send(struct tpm_chip *chip, unsigned char *buf,
    > + size_t len)
    > +{
    > + u32 ret = 0, status, burstcnt = 0, i, size = 0;
    > + u8 data;
    > +
    > + if (chip == NULL)
    > + return -EBUSY;
    > + if (len < TPM_HEADER_SIZE)
    > + return -EBUSY;
    > +
    > + ret = request_locality(chip);
    > + if (ret < 0)
    > + return ret;
    > +
    > + status = tpm_stm_spi_status(chip);
    > + if ((status & TPM_STS_COMMAND_READY) == 0) {
    > + tpm_stm_spi_cancel(chip);
    > + if (wait_for_stat
    > + (chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
    > + &chip->vendor.int_queue) < 0) {
    > + ret = -ETIME;
    > + goto out_err;
    > + }
    > + }
    > +
    > + for (i = 0; i < len - 1;) {
    > + burstcnt = get_burstcount(chip);
    > + size = min_t(int, len - i - 1, burstcnt);

    Same burstcnt check here.

    > + ret = SPI_WRITE_DATA(chip, TPM_DATA_FIFO, buf, size);
    > + if (ret < 0)
    > + goto out_err;
    > + i += size;
    > + }
    > +
    > + status = tpm_stm_spi_status(chip);
    > + if ((status & TPM_STS_DATA_EXPECT) == 0) {
    > + ret = -EIO;
    > + goto out_err;
    > + }
    > +
    > + /* write last byte */
    > + SPI_WRITE_DATA(chip, TPM_DATA_FIFO, buf + len - 1, 1);
    > +
    > + status = tpm_stm_spi_status(chip);
    > + if ((status & TPM_STS_DATA_EXPECT) != 0) {
    > + ret = -EIO;
    > + goto out_err;
    > + }
    > +
    > + /* go and do it */
    > + data = TPM_STS_GO;
    > + ret = SPI_WRITE_DATA(chip, TPM_STS, &data, 1);
    > + if (ret < 0)
    > + goto out_err;
    > +
    > + return len;
    > +out_err:
    > + tpm_stm_spi_cancel(chip);
    > + release_locality(chip);
    > + return ret;
    > +}
    > +
    > +/*
    > + * tpm_stm_spi_recv received TPM response through the SPI bus.
    > + * @param: chip, the tpm chip description
    > + * @param: buf, the tpm command buffer
    > + * @param: len, the tpm command size
    > +* @return: should be zero if success else the negative error code.
    > + */
    > +static int tpm_stm_spi_recv(struct tpm_chip *chip, unsigned char *buf,
    > + size_t count)
    > +{
    > + int size = 0;
    > + int expected;
    > +
    > + if (chip == NULL)
    > + return -EBUSY;
    > + if (count < TPM_HEADER_SIZE) {
    > + size = -EIO;
    > + goto out;
    > + }
    > +
    > + size = recv_data(chip, buf, TPM_HEADER_SIZE);
    > +
    > + /* read first 10 bytes, including tag, paramsize, and result */
    > + if (size < TPM_HEADER_SIZE) {
    > + dev_err(chip->dev, "Unable to read header\n");
    > + goto out;
    > + }
    > +
    > + expected = be32_to_cpu(*(__be32 *)(buf + 2));
    > + if (expected > count) {
    > + size = -EIO;
    > + goto out;
    > + }
    > +
    > + size += recv_data(chip, &buf[TPM_HEADER_SIZE],
    > + expected - TPM_HEADER_SIZE);
    > + if (size < expected) {
    > + dev_err(chip->dev, "Unable to read remainder of result\n");
    > + size = -ETIME;
    > + goto out;
    > + }
    > +
    > +out:
    > + chip->vendor.cancel(chip);
    > + release_locality(chip);
    > + return size;
    > +}
    > +
    > +
    > +static const struct file_operations tpm_st33_spi_fops = {
    > + .owner = THIS_MODULE,
    > + .llseek = no_llseek,
    > + .read = tpm_read,
    > + .write = tpm_write,
    > + .open = tpm_open,
    > + .release = tpm_release,
    > +};
    > +
    > +static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
    > +static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
    > +static DEVICE_ATTR(enabled, S_IRUGO, tpm_show_enabled, NULL);
    > +static DEVICE_ATTR(active, S_IRUGO, tpm_show_active, NULL);
    > +static DEVICE_ATTR(owned, S_IRUGO, tpm_show_owned, NULL);
    > +static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated, NULL);
    > +static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps_1_2, NULL);
    > +static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
    > +
    > +static struct attribute *stm_tpm_attrs[] = {
    > + &dev_attr_pubek.attr,
    > + &dev_attr_pcrs.attr,
    > + &dev_attr_enabled.attr,
    > + &dev_attr_active.attr,
    > + &dev_attr_owned.attr,
    > + &dev_attr_temp_deactivated.attr,
    > + &dev_attr_caps.attr,
    > + &dev_attr_cancel.attr, NULL,
    > +};
    > +
    > +static struct attribute_group stm_tpm_attr_grp = {
    > + .attrs = stm_tpm_attrs
    > +};
    > +
    > +static struct tpm_vendor_specific st_spi_tpm = {
    > + .send = tpm_stm_spi_send,
    > + .recv = tpm_stm_spi_recv,
    > + .cancel = tpm_stm_spi_cancel,
    > + .status = tpm_stm_spi_status,
    > + .attr_group = &stm_tpm_attr_grp,
    > + .miscdev = {.fops = &tpm_st33_spi_fops,},
    > +};
    > +
    > +static int evaluate_latency(struct tpm_chip *chip)
    > +{
    > + int latency = 0;
    > + struct spi_device *dev = (struct spi_device *)chip->vendor.iobase;
    > + struct st33zp24_platform_data *platform_data = dev->dev.platform_data;
    > + int status = 0;
    > + u8 data;
    > +
    > + for (; status == 0x00 && latency < MAX_SPI_LATENCY; latency++) {
    > + platform_data->latency = latency;
    > + status = SPI_READ_DATA(chip, TPM_INTF_CAPABILITY, &data, 1);
    > + }
    > + return latency - 1;
    > +} /* evaluate_latency() */
    > +
    > +static int interrupts;
    > +module_param(interrupts, int, 0444);
    > +MODULE_PARM_DESC(interrupts, "Enable interrupts");
    > +
    > +static int power_mgt = 1;
    > +module_param(power_mgt, int, 0444);
    > +MODULE_PARM_DESC(power_mgt, "Power Management");
    > +
    > +/*
    > + * tpm_st33_spi_probe initialize the TPM device
    > + * @param: client, the spi_device drescription (TPM SPI description).
    > + * @param: id, the spi_device_id struct.
    > + * @return: 0 in case of success.
    > + * -1 in other case.
    > + */
    > +static int
    > +tpm_st33_spi_probe(struct spi_device *dev)
    > +{
    > + u32 err = 0;
    > + u8 intmask;
    > + struct tpm_chip *chip;
    > + struct st33zp24_platform_data *platform_data;
    > +
    > + /* Check SPI platform functionnalities */
    > + if (dev == NULL) {
    > + pr_info("dev is NULL. exiting.\n");
    > + err = -ENODEV;
    > + goto end;
    > + }
    > +
    > + chip = tpm_register_hardware(&dev->dev, &st_spi_tpm);
    > + if (!chip) {
    > + err = -ENODEV;
    > + goto end;
    > + }
    > +
    > + /* Allocation of SPI buffers MISO and MOSI */
    > + /* Size is as follow: */
    > + /* Request burstcount value = 0x800 = 2048 */
    > + /* + */
    > + /* Response burstcount value = 0x400 = 1024 */
    > + /* + */
    > + /* At least: */
    > + /* 1 byte for direction/locality */
    > + /* 1 byte tpm tis register */
    > + /* 2 bytes spi data length (for request only) */
    > + /* 2 latency bytes */
    > + /* 1 status byte */
    > + /* = 2048 + 1024 + 7 */
    > + /* We reserved 2048 + 1024 + 20 in case latency byte */
    > + /* change */
    > + platform_data = dev->dev.platform_data;
    > + platform_data->tpm_spi_buffer[0] =
    > + kmalloc((TPM_BUFSIZE + (TPM_BUFSIZE / 2) +
    > + TPM_DIGEST_SIZE) * sizeof(u8), GFP_KERNEL);
    > + if (platform_data->tpm_spi_buffer[0] == NULL) {
    > + err = -ENOMEM;
    > + goto _tpm_clean_answer;
    > + }
    > + platform_data->tpm_spi_buffer[1] =
    > + kmalloc((TPM_BUFSIZE + (TPM_BUFSIZE / 2) +
    > + TPM_DIGEST_SIZE) * sizeof(u8) , GFP_KERNEL);
    > + if (platform_data->tpm_spi_buffer[1] == NULL) {
    > + err = -ENOMEM;
    > + goto _tpm_clean_response;
    > + }
    > +
    > + chip->vendor.iobase = dev;
    > +
    > + /* Default timeouts */
    > + chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
    > + chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
    > + chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
    > + chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
    > + chip->vendor.locality = LOCALITY0;
    > +
    > + if (power_mgt) {
    > + err = gpio_request(platform_data->io_lpcpd, "TPM IO_LPCPD");
    > + if (err)
    > + goto _gpio_init1;
    > + gpio_set_value(platform_data->io_lpcpd, 1);
    > + }
    > +
    > + platform_data->latency = evaluate_latency(chip);
    > + if (platform_data->latency <= 0x00) {
    > + err = -ENODEV;
    > + goto _gpio_init1;
    > + }
    > +
    > + /* Enable interrupt */
    > + /* Register GPIO pin through generic Linux GPIO API */
    > + if (interrupts) {
    > + init_completion(&platform_data->irq_detection);
    > + if (request_locality(chip) != LOCALITY0) {
    > + err = -ENODEV;
    > + goto _tpm_clean_response;
    > + }
    > + err = gpio_request(platform_data->io_serirq, "TPM IO_SERIRQ");
    > + if (err)
    > + goto _gpio_init2;
    > +
    > + /* Clear all existing */
    > + clear_interruption(chip);
    > + err = request_irq(gpio_to_irq(platform_data->io_serirq),
    > + &tpm_ioserirq_handler,
    > + IRQF_TRIGGER_HIGH | IRQF_SHARED,
    > + "TPM SERIRQ management", chip);
    > + if (err < 0) {
    > + pr_info("TPM SERIRQ signals %d not available\n",
    > + gpio_to_irq(platform_data->io_serirq));
    > + goto _irq_set;
    > + }
    > + err = SPI_READ_DATA(chip, TPM_INT_ENABLE, &intmask, 1);
    > + if (err < 0)
    > + goto _irq_set;
    > +
    > + intmask |= TPM_INTF_CMD_READY_INT
    > + | TPM_INTF_FIFO_AVALAIBLE_INT
    > + | TPM_INTF_WAKE_UP_READY_INT
    > + | TPM_INTF_LOC4SOFTRELEASE_INT
    > + | TPM_INTF_LOCALITY_CHANGE_INT
    > + | TPM_INTF_STS_VALID_INT
    > + | TPM_INTF_DATA_AVAIL_INT;
    > +
    > + err = SPI_WRITE_DATA(chip, TPM_INT_ENABLE, &intmask, 1);
    > + if (err < 0)
    > + goto _irq_set;
    > +
    > + intmask = TPM_GLOBAL_INT_ENABLE;
    > + err = SPI_WRITE_DATA(chip, TPM_INT_ENABLE + 3, &intmask, 1);
    > + if (err < 0)
    > + goto _irq_set;
    > +
    > + err = SPI_READ_DATA(chip, TPM_INT_STATUS, &intmask, 1);
    > + if (err < 0)
    > + goto _irq_set;
    > +
    > + chip->vendor.irq = interrupts;
    > +
    > + tpm_gen_interrupt(chip);
    > + }
    > +
    > + tpm_get_timeouts(chip);
    > +
    > + /* attach chip datas to client */
    > + spi_set_drvdata(dev, chip);
    > + platform_data->bchipf = false;
    > +
    > + pr_info("TPM SPI Initialized\n");
    > + return 0;
    > +_irq_set:
    > + free_irq(gpio_to_irq(platform_data->io_serirq), chip);
    > +_gpio_init2:
    > + if (platform_data && interrupts)
    > + gpio_free(platform_data->io_serirq);
    > +_gpio_init1:
    > + if (platform_data && power_mgt)
    > + gpio_free(platform_data->io_lpcpd);
    > +_tpm_clean_response:
    > + tpm_remove_hardware(chip->dev);
    > + if (platform_data->tpm_spi_buffer[1] != NULL) {
    > + kfree(platform_data->tpm_spi_buffer[1]);
    > + platform_data->tpm_spi_buffer[1] = NULL;
    > + }
    > +_tpm_clean_answer:
    > + if (platform_data->tpm_spi_buffer[0] != NULL) {
    > + kfree(platform_data->tpm_spi_buffer[0]);
    > + platform_data->tpm_spi_buffer[0] = NULL;
    > + }
    > +
    > + platform_data->bchipf = true;
    > +end:
    > + pr_info("TPM SPI initialisation fail\n");
    > + return err;
    > +}
    > +
    > +/*
    > + * tpm_st33_spi_remove remove the TPM device
    > + * @param: client, the spi_device drescription (TPM SPI description).
    > + clear_bit(0, &chip->is_open);
    > + * @return: 0 in case of success.
    > + */
    > +static int tpm_st33_spi_remove(struct spi_device *client)
    > +{
    > + struct tpm_chip *chip = (struct tpm_chip *)spi_get_drvdata(client);
    > + struct st33zp24_platform_data *pin_infos =
    > + ((struct spi_device *)chip->vendor.iobase)->dev.platform_data;
    > +
    > + if (pin_infos != NULL) {
    > + gpio_free(pin_infos->io_lpcpd);
    > +
    > + /* Check if chip has been previously clean */
    > + if (pin_infos->bchipf != true)

    You can still get rid of bchipf too. If probe() fails remove() won't
    be called - that seems to be all bchipf is checking...

    Kent

    > + tpm_remove_hardware(chip->dev);
    > + if (pin_infos->tpm_spi_buffer[1] != NULL) {
    > + kfree(pin_infos->tpm_spi_buffer[1]);
    > + pin_infos->tpm_spi_buffer[1] = NULL;
    > + }
    > + if (pin_infos->tpm_spi_buffer[0] != NULL) {
    > + kfree(pin_infos->tpm_spi_buffer[0]);
    > + pin_infos->tpm_spi_buffer[0] = NULL;
    > + }
    > + }
    > +
    > + return 0;
    > +}
    > +
    > +/*
    > + * tpm_st33_spi_pm_suspend suspend the TPM device
    > + * Added: Work around when suspend and no tpm application is running, suspend
    > + * may fail because chip->data_buffer is not set (only set in tpm_open in Linux
    > + * TPM core)
    > + * @param: client, the spi_device drescription (TPM SPI description).
    > + * @param: mesg, the power management message.
    > + * @return: 0 in case of success.
    > + */
    > +static int tpm_st33_spi_pm_suspend(struct spi_device *client,
    > + pm_message_t mesg)
    > +{
    > + struct tpm_chip *chip =
    > + (struct tpm_chip *)spi_get_drvdata(client);
    > + struct st33zp24_platform_data *pin_infos =
    > + ((struct spi_device *)chip->vendor.iobase)->dev.platform_data;
    > + int ret = 0;
    > +
    > + if (power_mgt)
    > + gpio_set_value(pin_infos->io_lpcpd, 0);
    > + else {
    > + if (chip->data_buffer == NULL)
    > + chip->data_buffer = pin_infos->tpm_spi_buffer[0];
    > + ret = tpm_pm_suspend(&client->dev);
    > + }
    > + return ret;
    > +} /* tpm_st33_spi_suspend() */
    > +
    > +/*
    > + * tpm_st33_spi_pm_resume resume the TPM device
    > + * @param: spi, the spi_device drescription (TPM SPI description).
    > + * @return: 0 in case of success.
    > + */
    > +static int tpm_st33_spi_pm_resume(struct spi_device *spi)
    > +{
    > + struct tpm_chip *chip =
    > + (struct tpm_chip *)spi_get_drvdata(spi);
    > + struct st33zp24_platform_data *pin_infos =
    > + ((struct spi_device *)chip->vendor.iobase)->dev.platform_data;
    > +
    > + int ret = 0;
    > + if (power_mgt) {
    > + gpio_set_value(pin_infos->io_lpcpd, 1);
    > + ret = wait_for_serirq_timeout(chip,
    > + (chip->vendor.status(chip) &&
    > + TPM_STS_VALID) == TPM_STS_VALID,
    > + chip->vendor.timeout_b);
    > + } else {
    > + if (chip->data_buffer == NULL)
    > + chip->data_buffer = pin_infos->tpm_spi_buffer[0];
    > + ret = tpm_pm_resume(&spi->dev);
    > + if (!ret)
    > + tpm_do_selftest(chip);
    > + }
    > + return ret;
    > +} /* tpm_st33_spi_pm_resume() */
    > +
    > +static struct spi_driver tpm_st33_spi_driver = {
    > + .driver = {
    > + .owner = THIS_MODULE,
    > + .name = TPM_ST33_SPI,
    > + },
    > + .probe = tpm_st33_spi_probe,
    > + .remove = tpm_st33_spi_remove,
    > + .resume = tpm_st33_spi_pm_resume,
    > + .suspend = tpm_st33_spi_pm_suspend,
    > +};
    > +
    > +/*
    > + * tpm_st33_spi_init initialize driver
    > + * @return: 0 if successful, else non zero value.
    > + */
    > +static int __init tpm_st33_spi_init(void)
    > +{
    > + return spi_register_driver(&tpm_st33_spi_driver);
    > +}
    > +
    > +/*
    > + * tpm_st33_spi_exit The kernel calls this function during unloading the
    > + * module or during shut down process
    > + */
    > +static void __exit tpm_st33_spi_exit(void)
    > +{
    > + spi_unregister_driver(&tpm_st33_spi_driver);
    > +}
    > +
    > +module_init(tpm_st33_spi_init);
    > +module_exit(tpm_st33_spi_exit);
    > +
    > +MODULE_AUTHOR("Christophe Ricard (tpmsupport@st.com)");
    > +MODULE_DESCRIPTION("STM TPM SPI ST33 Driver");
    > +MODULE_VERSION("1.2.0");
    > +MODULE_LICENSE("GPL");
    > diff --git a/drivers/char/tpm/tpm_spi_stm_st33.h b/drivers/char/tpm/tpm_spi_stm_st33.h
    > new file mode 100644
    > index 0000000..752158e
    > --- /dev/null
    > +++ b/drivers/char/tpm/tpm_spi_stm_st33.h
    > @@ -0,0 +1,86 @@
    > +/*
    > + * STMicroelectronics TPM SPI Linux driver for TPM ST33NP18
    > + * Copyright (C) 2009, 2010 STMicroelectronics
    > + *
    > + * This program is free software; you can redistribute it and/or modify
    > + * it under the terms of the GNU General Public License as published by
    > + * the Free Software Foundation; either version 2 of the License, or
    > + * (at your option) any later version.
    > + *
    > + * This program is distributed in the hope that it will be useful,
    > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    > + * GNU General Public License for more details.
    > + *
    > + * You should have received a copy of the GNU General Public License along
    > + * with this program; if not, write to the Free Software Foundation, Inc.,
    > + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
    > + *
    > + * STMicroelectronics version 1.2.0, Copyright (C) 2010
    > + * STMicroelectronics comes with ABSOLUTELY NO WARRANTY.
    > + * This is free software, and you are welcome to redistribute it
    > + * under certain conditions.
    > + *
    > + * @Author: Christophe RICARD tpmsupport@st.com
    > + *
    > + * @File: tpm_spi_stm_st33.h
    > + *
    > + * @Date: 09/15/2010
    > + */
    > +#ifndef __STM_ST33_TPM_SPI_MAIN_H__
    > +#define __STM_ST33_TPM_SPI_MAIN_H__
    > +
    > +#include <linux/pci.h>
    > +#include <linux/module.h>
    > +#include <linux/platform_device.h>
    > +#include <linux/fs.h>
    > +#include <linux/miscdevice.h>
    > +
    > +#define MINOR_NUM_SPI 224
    > +
    > +#define TPM_ACCESS (0x0)
    > +#define TPM_STS (0x18)
    > +#define TPM_HASH_END (0x20)
    > +#define TPM_DATA_FIFO (0x24)
    > +#define TPM_HASH_DATA (0x24)
    > +#define TPM_HASH_START (0x28)
    > +#define TPM_INTF_CAPABILITY (0x14)
    > +#define TPM_INT_STATUS (0x10)
    > +#define TPM_INT_ENABLE (0x08)
    > +
    > +#define TPM_DUMMY_BYTE 0x00
    > +#define TPM_WRITE_DIRECTION 0x80
    > +#define TPM_HEADER_SIZE 10
    > +#define TPM_BUFSIZE 2048
    > +
    > +/* ioctl commands */
    > +#define TPMIOC_CANCEL _IO('T', 0x00)
    > +#define TPMIOC_TRANSMIT _IO('T', 0x01)
    > +#define TPMIOC_HASH _IO('T', 0x02)
    > +#define TPMIOC_CHANGELOCALITY _IO('T', 0x03)
    > +
    > +#define LOCALITY0 0
    > +#define LOCALITY4 4
    > +
    > +#define TPM_ST_SPI_OK 0x5A
    > +
    > +
    > +#define MAX_SPI_LATENCY 15
    > +
    > +#define TPM_ST33_SPI "st33zp24_spi"
    > +
    > +struct st33zp24_platform_data {
    > + int io_serirq;
    > + int io_lpcpd;
    > + int latency;
    > + bool bchipf;
    > + u8 *tpm_spi_buffer[2]; /* 0 Request 1 Response */
    > + struct completion irq_detection;
    > +};
    > +
    > +struct st_tpm_hash_t {
    > + int size;
    > + u8 *data;
    > +};
    > +
    > +#endif /* __STM_ST33_TPM_SPI_MAIN_H__ */
    > --
    > 1.7.1
    >
    >
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    > tpmdd-devel@lists.sourceforge.net
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