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Date: Fri, 10 May 2013 10:06:43 -0500
From: Kent Yoder <shpedoikal@...il.com>
To: Matthias Leblanc <mathias.leblanc@...com>
Cc: Kent Yoder <key@...ux.vnet.ibm.com>,
Rajiv Andrade <mail@...jiv.net>,
Marcel Selhorst <tpmdd@...horst.net>,
Sirrix AG <tpmdd@...rix.com>,
TPM Device Driver List <tpmdd-devel@...ts.sourceforge.net>,
Jean-Luc Blanc <jean-luc.blanc@...com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [tpmdd-devel] [PATCH 1/1] TPM: STMicroelectronics st33 driver SPI
On Fri, May 10, 2013 at 8:38 AM, Kent Yoder <shpedoikal@...il.com> wrote:
> Hi Mathias,
Sorry, this note got sent before I was done somehow...
A few compile warnings left:
drivers/char/tpm/tpm_spi_stm_st33.c: In function ‘tpm_stm_spi_status’:
drivers/char/tpm/tpm_spi_stm_st33.c:289:2: error: ‘data’ is used
uninitialized in this function [-Werror=uninitialized]
drivers/char/tpm/tpm_spi_stm_st33.c: In function ‘get_burstcount’:
drivers/char/tpm/tpm_spi_stm_st33.c:386:12: error: ‘temp’ is used
uninitialized in this function [-Werror=uninitialized]
drivers/char/tpm/tpm_spi_stm_st33.c: In function ‘check_locality’:
drivers/char/tpm/tpm_spi_stm_st33.c:305:22: error: ‘data’ may be used
uninitialized in this function [-Werror=uninitialized]
And smatch warnings:
drivers/char/tpm/tpm_spi_stm_st33.c:247 wait_for_serirq_timeout()
error: 'wait_for_completion_interruptible_timeout()' returns negative
and 'status' is unsigned
drivers/char/tpm/tpm_spi_stm_st33.c:382 get_burstcount() warn:
unsigned 'status' is never less than zero.
drivers/char/tpm/tpm_spi_stm_st33.c:388 get_burstcount() warn:
unsigned 'status' is never less than zero.
drivers/char/tpm/tpm_spi_stm_st33.c:459 recv_data() warn: unsigned
'status' is never less than zero.
drivers/char/tpm/tpm_spi_stm_st33.c:508 tpm_stm_spi_send() warn:
unsigned 'ret' is never less than zero.
drivers/char/tpm/tpm_spi_stm_st33.c:526 tpm_stm_spi_send() warn:
unsigned 'ret' is never less than zero.
drivers/char/tpm/tpm_spi_stm_st33.c:549 tpm_stm_spi_send() warn:
unsigned 'ret' is never less than zero.
drivers/char/tpm/tpm_spi_stm_st33.c:772 tpm_st33_spi_probe() warn:
unsigned 'err' is never less than zero.
drivers/char/tpm/tpm_spi_stm_st33.c:778 tpm_st33_spi_probe() warn:
unsigned 'err' is never less than zero.
drivers/char/tpm/tpm_spi_stm_st33.c:790 tpm_st33_spi_probe() warn:
unsigned 'err' is never less than zero.
drivers/char/tpm/tpm_spi_stm_st33.c:795 tpm_st33_spi_probe() warn:
unsigned 'err' is never less than zero.
drivers/char/tpm/tpm_spi_stm_st33.c:799 tpm_st33_spi_probe() warn:
unsigned 'err' is never less than zero.
drivers/char/tpm/tpm_spi_stm_st33.c:818 tpm_st33_spi_probe() warn:
variable dereferenced before check 'platform_data' (see line 717)
And again this patch is getting its last 2 lines clipped in
tpm_spi_stm_st33.c. Please look below for where to put the ChangeLog
info.
Just as an FYI, I probably am not going to reply to repeat anything
I've said above for future submissions. We're really going around in
circles here. :-/
Kent
> On Tue, May 07, 2013 at 12:16:05PM +0200, Matthias Leblanc wrote:
>> From: Mathias Leblanc <mathias.leblanc@...com>
>>
>> * 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
>>
>> Changelog:
>>
>> date: 07-05-2013
>> Remove unused variables
>> Remove tpm_st33_spi_exit function that cause compilation error
>>
>> Signed-off-by: Mathias Leblanc <mathias.leblanc@...com>
>> ---
>
> ChangeLog goes in here.
>
>> drivers/char/tpm/Kconfig | 10 +
>> drivers/char/tpm/Makefile | 1 +
>> drivers/char/tpm/tpm_spi_stm_st33.c | 939 +++++++++++++++++++++++++++++++++++
>> drivers/char/tpm/tpm_spi_stm_st33.h | 61 +++
>> 4 files changed, 1011 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..9279dc0
>> --- /dev/null
>> +++ b/drivers/char/tpm/tpm_spi_stm_st33.c
>> @@ -0,0 +1,939 @@
>> +/*
>> + * 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@...com
>> + *
>> + * @File: tpm_stm_st33_spi.c
>> + *
>> + * @Synopsis:
>> + * 09/15/2010: First shot driver tpm_tis driver for lpc is
>> + * used as model.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/init.h>
>> +#include <linux/spi/spi.h>
>> +#include <linux/wait.h>
>> +#include <linux/string.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/spinlock.h>
>> +#include <linux/sysfs.h>
>> +#include <linux/gpio.h>
>> +#include <linux/uaccess.h>
>> +#include <linux/slab.h>
>> +#include <linux/sched.h>
>> +
>> +#include "tpm.h"
>> +
>> +#include "tpm_spi_stm_st33.h"
>> +
>> +enum stm33zp24_access {
>> + TPM_ACCESS_VALID = 0x80,
>> + TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
>> + TPM_ACCESS_REQUEST_PENDING = 0x04,
>> + TPM_ACCESS_REQUEST_USE = 0x02,
>> +};
>> +
>> +enum stm33zp24_status {
>> + TPM_STS_VALID = 0x80,
>> + TPM_STS_COMMAND_READY = 0x40,
>> + TPM_STS_GO = 0x20,
>> + TPM_STS_DATA_AVAIL = 0x10,
>> + TPM_STS_DATA_EXPECT = 0x08,
>> +};
>> +
>> +enum stm33zp24_int_flags {
>> + TPM_GLOBAL_INT_ENABLE = 0x80,
>> + TPM_INTF_CMD_READY_INT = 0x080,
>> + TPM_INTF_FIFO_AVALAIBLE_INT = 0x040,
>> + TPM_INTF_WAKE_UP_READY_INT = 0x020,
>> + TPM_INTF_LOC4SOFTRELEASE_INT = 0x008,
>> + TPM_INTF_LOCALITY_CHANGE_INT = 0x004,
>> + TPM_INTF_STS_VALID_INT = 0x002,
>> + TPM_INTF_DATA_AVAIL_INT = 0x001,
>> +};
>> +
>> +enum tis_defaults {
>> + TIS_SHORT_TIMEOUT = 750, /* ms */
>> + TIS_LONG_TIMEOUT = 2000, /* 2 sec */
>> +};
>> +
>> +
>> +static inline int spi_read_write(struct spi_device *spi,
>> + struct spi_transfer xfer) {
>> + struct spi_message msg;
>> + spi_message_init(&msg);
>> + spi_message_add_tail(&xfer, &msg);
>> + return spi_sync(spi, &msg);
>> +}
>> +
>> +/*
>> + * spi_write8_reg
>> + * Send byte to the TIS register according to the ST33ZP24 SPI protocol.
>> + * @param: tpm, the chip description
>> + * @param: tpm_register, the tpm tis register where the data should be written
>> + * @param: tpm_data, the tpm_data to write inside the tpm_register
>> + * @param: tpm_size, The length of the data
>> + * @return: should be zero if success else a negative error code.
>> + */
>> +static int spi_write8_reg(struct tpm_chip *tpm, u8 tpm_register,
>> + u8 *tpm_data, u16 tpm_size)
>> +{
>> + u8 data;
>> + int total_length = 0, nbr_dummy_bytes;
>> + int value = 0;
>> + struct spi_device *dev = (struct spi_device *)tpm->vendor.iobase;
>> + struct st33zp24_platform_data *platform_data = dev->dev.platform_data;
>> + u8 *data_buffer = platform_data->tpm_spi_buffer[0];
>> + struct spi_transfer xfer = {
>> + .tx_buf = data_buffer,
>> + .rx_buf = platform_data->tpm_spi_buffer[1],
>> + };
>> +
>> + u8 latency = platform_data->latency + tpm_size + 1;
>> +
>> + /* Pre-Header */
>> + data = TPM_WRITE_DIRECTION | tpm->vendor.locality;
>> + memcpy(data_buffer + total_length, &data, sizeof(data));
>> + total_length++;
>> + data = tpm_register;
>> + memcpy(data_buffer + total_length, &data, sizeof(data));
>> + total_length++;
>> +
>> + if (tpm_size > 0 &&
>> + (tpm_register == TPM_DATA_FIFO ||
>> + tpm_register == TPM_HASH_DATA)) {
>> + data = (tpm_size >> 8) & 0x00ff;
>> + data_buffer[total_length++] = data;
>> + data = tpm_size & 0x00ff;
>> + data_buffer[total_length++] = data;
>> + latency -= 2;
>> + }
>> +
>> + memcpy(&data_buffer[total_length], tpm_data, tpm_size);
>> + total_length += tpm_size;
>> +
>> + nbr_dummy_bytes = platform_data->latency + 1;
>> + memset(&data_buffer[total_length], TPM_DUMMY_BYTE,
>> + platform_data->latency + 1);
>> +
>> + xfer.len = total_length;
>> +
>> + value = spi_read_write(dev, xfer);
>> +
>> + if (value == 0) {
>> + nbr_dummy_bytes = total_length - 1 - nbr_dummy_bytes;
>> + while (nbr_dummy_bytes < total_length &&
>> + ((u8 *)xfer.rx_buf)[nbr_dummy_bytes] == 0)
>> + nbr_dummy_bytes++;
>> +
>> + if (((u8 *)xfer.rx_buf)[nbr_dummy_bytes] != 0)
>> + value = ((u8 *)xfer.rx_buf)[nbr_dummy_bytes];
>> + }
>> +
>> + return value;
>> +} /* spi_write8_reg() */
>> +
>> +/*
>> + * spi_read8_reg
>> + * Recv byte from the TIS register according to the ST33ZP24 SPI protocol.
>> + * @param: tpm, the chip description
>> + * @param: tpm_register, the tpm tis register where the data should be read
>> + * @param: tpm_data, the TPM response
>> + * @param: tpm_size, tpm TPM response size to read.
>> + * @return: should be zero if success else a negative error code.
>> + */
>> +static u8 spi_read8_reg(struct tpm_chip *tpm, u8 tpm_register,
>> + u8 *tpm_data, u16 tpm_size)
>> +{
>> + u8 data;
>> + int total_length = 0, nbr_dummy_bytes;
>> + int value = 0;
>> + struct spi_device *dev = (struct spi_device *)tpm->vendor.iobase;
>> + struct st33zp24_platform_data *platform_data = dev->dev.platform_data;
>> + u8 *data_buffer = platform_data->tpm_spi_buffer[0];
>> + struct spi_transfer xfer = {
>> + .tx_buf = data_buffer,
>> + .rx_buf = platform_data->tpm_spi_buffer[1],
>> + };
>> +
>> + /* Pre-Header */
>> +
>> + data = tpm->vendor.locality;
>> + memcpy(data_buffer + total_length, &data, sizeof(data));
>> + total_length++;
>> + data = tpm_register;
>> + memcpy(data_buffer + total_length, &data, sizeof(data));
>> + total_length++;
>> +
>> + nbr_dummy_bytes = platform_data->latency + 1;
>> + memset(&data_buffer[total_length], TPM_DUMMY_BYTE,
>> + platform_data->latency + 1);
>> +
>> + xfer.len = total_length;
>> +
>> + /* header + status byte + size of the data + status byte */
>> + value = spi_read_write(dev, xfer);
>> +
>> + if (tpm_size > 0 && value == 0) {
>> + nbr_dummy_bytes = 2;
>> + for (; nbr_dummy_bytes < total_length &&
>> + ((u8 *)xfer.rx_buf)[nbr_dummy_bytes] == 0;
>> + nbr_dummy_bytes++)
>> + ;
>> +
>> + if (nbr_dummy_bytes + 1 < total_length) {
>> + value = ((u8 *)xfer.rx_buf)[nbr_dummy_bytes];
>> +
>> + if (tpm_size > 0)
>> + memcpy(tpm_data, xfer.rx_buf +
>> + nbr_dummy_bytes + 1,
>> + tpm_size);
>> + }
>> + }
>> + return value;
>> +} /* spi_read8_reg() */
>> +
>> +/*
>> + * clear_interruption
>> + * clear the TPM interrupt register.
>> + * @param: tpm, the chip description
>> + */
>> +static void clear_interruption(struct tpm_chip *tpm)
>> +{
>> + u8 interrupt;
>> + spi_read8_reg(tpm, TPM_INT_STATUS, &interrupt, 1);
>> + /* Clear interrupts handled with TPM_EOI */
>> + spi_write8_reg(tpm, TPM_INT_STATUS, &interrupt, 1);
>> + spi_read8_reg(tpm, TPM_INT_STATUS, &interrupt, 1);
>> +} /* clear_interruption() */
>> +
>> +/*
>> + * _wait_for_serirq_timeout
>> + * @param: tpm, the chip description
>> + * @param: timeout, the timeout of the interrupt
>> + * @return: the status of the interruption.
>> + */
>> +unsigned long wait_for_serirq_timeout(struct tpm_chip *chip, bool condition,
>> + unsigned long timeout)
>> +{
>> + 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);
>> +
>> + if (!status) {
>> + status = -EBUSY;
>> + goto wait_end;
>> + }
>> + clear_interruption(chip);
>> + if (condition)
>> + status = 1;
>> +
>> +wait_end:
>> + return status;
>> +}
>> +
>> +
>> +/*
>> + * tpm_stm_spi_cancel, cancel is not implemented.
>> + * @param: chip, the tpm chip description as specified in
>> + * driver/char/tpm/tpm.h.
>> + */
>> +static void tpm_stm_spi_cancel(struct tpm_chip *chip)
>> +{
>> + u8 data = TPM_STS_COMMAND_READY;
>> +
>> + /* this causes the current command to be aborted */
>> + spi_write8_reg(chip, TPM_STS, &data, 1);
>> +} /* tpm_stm_spi_cancel() */
>> +
>> +/*
>> + * tpm_stm_spi_status return the TPM_STS register
>> + * @param: chip, the tpm chip description
>> + * @return: the TPM_STS register value.
>> + */
>> +static u8 tpm_stm_spi_status(struct tpm_chip *chip)
>> +{
>> + u8 data;
>> +
>> + spi_read8_reg(chip, TPM_STS, &data, 1);
>> + return data;
>> +} /* tpm_stm_spi_status() */
>> +
>> +
>> +
>> +/*
>> + * check_locality if the locality is active
>> + * @param: chip, the tpm chip description
>> + * @return: the active locality or -EACCESS.
>> + */
>> +static int check_locality(struct tpm_chip *chip)
>> +{
>> + u8 data;
>> + u8 status;
>> +
>> + status = spi_read8_reg(chip, TPM_ACCESS, &data, 1);
>> + if (status && (data &
>> + (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
>> + (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
>> + return chip->vendor.locality;
>> +
>> + return -EACCES;
>> +} /* check_locality() */
>> +
>> +/*
>> + * request_locality request the TPM locality
>> + * @param: chip, the chip description
>> + * @return: the active locality or EACCESS.
>> + */
>> +static int request_locality(struct tpm_chip *chip)
>> +{
>> + unsigned long stop;
>> + long rc;
>> + u8 data;
>> +
>> + /* Check locality */
>> + if (check_locality(chip) == chip->vendor.locality)
>> + return chip->vendor.locality;
>> +
>> + /* Request locality */
>> + data = TPM_ACCESS_REQUEST_USE;
>> + rc = spi_write8_reg(chip, TPM_ACCESS, &data, 1);
>> + if (rc < 0)
>> + goto end;
>> +
>> + /* wait for burstcount */
>> + if (chip->vendor.irq) {
>> + rc = wait_for_serirq_timeout(chip, (check_locality
>> + (chip) >= 0),
>> + chip->vendor.timeout_a);
>> + if (rc > 0)
>> + return chip->vendor.locality;
>> + } else {
>> + stop = jiffies + chip->vendor.timeout_a;
>> + do {
>> + if (check_locality(chip) >= 0)
>> + return chip->vendor.locality;
>> + msleep(TPM_TIMEOUT);
>> + } while (time_before(jiffies, stop));
>> + }
>> +end:
>> + return -EACCES;
>> +} /* request_locality() */
>> +
>> +/*
>> + * release_locality release the active locality
>> + * @param: chip, the tpm chip description.
>> + */
>> +static void release_locality(struct tpm_chip *chip)
>> +{
>> + u8 data;
>> +
>> + data = TPM_ACCESS_ACTIVE_LOCALITY;
>> + spi_write8_reg(chip, TPM_ACCESS, &data, 1);
>> +} /* release_locality()*/
>> +
>> +/*
>> + * get_burstcount return the burstcount address 0x19 0x1A
>> + * @param: chip, the chip description
>> + * return: the burstcount.
>> + */
>> +static int get_burstcount(struct tpm_chip *chip)
>> +{
>> + unsigned long stop;
>> + u32 burstcnt, 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_read8_reg(chip, tpm_reg, &temp, 1);
>> + if (status < 0)
>> + goto end;
>> +
>> + tpm_reg = tpm_reg + 1;
>> + burstcnt = temp;
>> + status = spi_read8_reg(chip, tpm_reg, &temp, 1);
>> + if (status < 0)
>> + goto end;
>> +
>> + burstcnt |= temp << 8;
>> + if (burstcnt)
>> + return burstcnt;
>> + msleep(TPM_TIMEOUT);
>> + } while (time_before(jiffies, stop));
>> +
>> +end:
>> + return -EBUSY;
>> +} /* get_burstcount() */
>> +
>> +/*
>> + * wait_for_stat wait for a TPM_STS value
>> + * @param: chip, the tpm chip description
>> + * @param: mask, the value mask to wait
>> + * @param: timeout, the timeout
>> + * @param: queue, the wait queue.
>> + * @return: the tpm status, 0 if success, -ETIME if timeout is reached.
>> + */
>> +static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
>> + wait_queue_head_t *queue)
>> +{
>> + unsigned long stop;
>> + long rc;
>> + u8 status;
>> +
>> + /* check current status */
>> + status = tpm_stm_spi_status(chip);
>> + if (!chip->vendor.irq && (status & mask) == mask)
>> + return 0;
>> +
>> + if (chip->vendor.irq) {
>> + rc = wait_for_serirq_timeout(chip, ((tpm_stm_spi_status
>> + (chip) & mask) ==
>> + mask), timeout);
>> + if (rc > 0)
>> + return 0;
>> + } else {
>> + stop = jiffies + timeout;
>> + do {
>> + msleep(TPM_TIMEOUT);
>> + status = tpm_stm_spi_status(chip);
>> + if ((status & mask) == mask)
>> + return 0;
>> + } while (time_before(jiffies, stop));
>> + }
>> + return -ETIME;
>> +} /* wait_for_stat() */
>> +
>> +/*
>> + * recv_data receive data
>> + * @param: chip, the tpm chip description
>> + * @param: buf, the buffer where the data are received
>> + * @param: count, the number of data to receive
>> + * @return: the tpm status, 0 if success, -ETIME if timeout is reached.
>> + */
>> +static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
>> +{
>> + u32 size = 0, burstcnt, 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);
>> + status = spi_read8_reg(chip, TPM_DATA_FIFO, buf + size, len);
>> + if (status < 0)
>> + return status;
>> +
>> +
>> + size += len;
>> + }
>> + return size;
>> +}
>> +
>> +/*
>> + * tpm_ioserirq_handler the serirq irq handler
>> + * @param: irq, the tpm chip description
>> + * @param: dev_id, the description of the chip
>> + * @return: the status of the handler.
>> + */
>> +static irqreturn_t tpm_ioserirq_handler(int irq, void *dev_id)
>> +{
>> + struct tpm_chip *chip = dev_id;
>> + struct spi_device *client;
>> + struct st33zp24_platform_data *pin_infos;
>> +
>> + disable_irq_nosync(irq);
>> +
>> + client = (struct spi_device *)chip->vendor.iobase;
>> + pin_infos = client->dev.platform_data;
>> +
>> + complete(&pin_infos->irq_detection);
>> + return IRQ_HANDLED;
>> +} /* tpm_ioserirq_handler() */
>> +
>> +/*
>> + * tpm_stm_spi_send send TPM commands through the SPI bus.
>> + * @param: chip, the tpm chip description
>> + * @param: buf, the tpm command buffer
>> + * @param: len, the tpm command size
>> + * @return: should be zero if success else the negative error code.
>> + */
>> +static int tpm_stm_spi_send(struct tpm_chip *chip, unsigned char *buf,
>> + size_t len)
>> +{
>> + u32 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);
>> + ret = spi_write8_reg(chip, TPM_DATA_FIFO, buf, size);
>> + if (ret < 0)
>> + goto out_err;
>> + i += size;
>> + }
>> +
>> + status = tpm_stm_spi_status(chip);
>> + if ((status & TPM_STS_DATA_EXPECT) == 0) {
>> + ret = -EIO;
>> + goto out_err;
>> + }
>> +
>> + /* write last byte */
>> + spi_write8_reg(chip, TPM_DATA_FIFO, buf + len - 1, 1);
>> +
>> + status = tpm_stm_spi_status(chip);
>> + if ((status & TPM_STS_DATA_EXPECT) != 0) {
>> + ret = -EIO;
>> + goto out_err;
>> + }
>> +
>> + /* go and do it */
>> + data = TPM_STS_GO;
>> + ret = spi_write8_reg(chip, TPM_STS, &data, 1);
>> + if (ret < 0)
>> + goto out_err;
>> +
>> + return len;
>> +out_err:
>> + tpm_stm_spi_cancel(chip);
>> + release_locality(chip);
>> + return ret;
>> +}
>> +
>> +/*
>> + * tpm_stm_spi_recv received TPM response through the SPI bus.
>> + * @param: chip, the tpm chip description
>> + * @param: buf, the tpm command buffer
>> + * @param: len, the tpm command size
>> +* @return: should be zero if success else the negative error code.
>> + */
>> +static int tpm_stm_spi_recv(struct tpm_chip *chip, unsigned char *buf,
>> + size_t count)
>> +{
>> + int size = 0;
>> + int expected;
>> +
>> + if (chip == NULL)
>> + return -EBUSY;
>> + if (count < TPM_HEADER_SIZE) {
>> + size = -EIO;
>> + goto out;
>> + }
>> +
>> + size = recv_data(chip, buf, TPM_HEADER_SIZE);
>> +
>> + /* read first 10 bytes, including tag, paramsize, and result */
>> + if (size < TPM_HEADER_SIZE) {
>> + dev_err(chip->dev, "Unable to read header\n");
>> + goto out;
>> + }
>> +
>> + expected = be32_to_cpu(*(__be32 *)(buf + 2));
>> + if (expected > count) {
>> + size = -EIO;
>> + goto out;
>> + }
>> +
>> + size += recv_data(chip, &buf[TPM_HEADER_SIZE],
>> + expected - TPM_HEADER_SIZE);
>> + if (size < expected) {
>> + dev_err(chip->dev, "Unable to read remainder of result\n");
>> + size = -ETIME;
>> + goto out;
>> + }
>> +
>> +out:
>> + chip->vendor.cancel(chip);
>> + release_locality(chip);
>> + return size;
>> +}
>> +
>> +
>> +static const struct file_operations tpm_st33_spi_fops = {
>> + .owner = THIS_MODULE,
>> + .llseek = no_llseek,
>> + .read = tpm_read,
>> + .write = tpm_write,
>> + .open = tpm_open,
>> + .release = tpm_release,
>> +};
>> +
>> +static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
>> +static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
>> +static DEVICE_ATTR(enabled, S_IRUGO, tpm_show_enabled, NULL);
>> +static DEVICE_ATTR(active, S_IRUGO, tpm_show_active, NULL);
>> +static DEVICE_ATTR(owned, S_IRUGO, tpm_show_owned, NULL);
>> +static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated, NULL);
>> +static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps_1_2, NULL);
>> +static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
>> +
>> +static struct attribute *stm_tpm_attrs[] = {
>> + &dev_attr_pubek.attr,
>> + &dev_attr_pcrs.attr,
>> + &dev_attr_enabled.attr,
>> + &dev_attr_active.attr,
>> + &dev_attr_owned.attr,
>> + &dev_attr_temp_deactivated.attr,
>> + &dev_attr_caps.attr,
>> + &dev_attr_cancel.attr, NULL,
>> +};
>> +
>> +static struct attribute_group stm_tpm_attr_grp = {
>> + .attrs = stm_tpm_attrs
>> +};
>> +
>> +static struct tpm_vendor_specific st_spi_tpm = {
>> + .send = tpm_stm_spi_send,
>> + .recv = tpm_stm_spi_recv,
>> + .cancel = tpm_stm_spi_cancel,
>> + .status = tpm_stm_spi_status,
>> + .attr_group = &stm_tpm_attr_grp,
>> + .miscdev = {.fops = &tpm_st33_spi_fops,},
>> +};
>> +
>> +static int evaluate_latency(struct tpm_chip *chip)
>> +{
>> + int latency = 0;
>> + struct spi_device *dev = (struct spi_device *)chip->vendor.iobase;
>> + struct st33zp24_platform_data *platform_data = dev->dev.platform_data;
>> + int status = 0;
>> + u8 data;
>> +
>> + for (; status == 0x00 && latency < MAX_SPI_LATENCY; latency++) {
>> + platform_data->latency = latency;
>> + status = spi_read8_reg(chip, TPM_INTF_CAPABILITY, &data, 1);
>> + }
>> + return latency - 1;
>> +} /* evaluate_latency() */
>> +
>> +static int interrupts;
>> +module_param(interrupts, int, 0444);
>> +MODULE_PARM_DESC(interrupts, "Enable interrupts");
>> +
>> +static int power_mgt = 1;
>> +module_param(power_mgt, int, 0444);
>> +MODULE_PARM_DESC(power_mgt, "Power Management");
>> +
>> +/*
>> + * tpm_st33_spi_probe initialize the TPM device
>> + * @param: client, the spi_device drescription (TPM SPI description).
>> + * @param: id, the spi_device_id struct.
>> + * @return: 0 in case of success.
>> + * -1 in other case.
>> + */
>> +static int
>> +tpm_st33_spi_probe(struct spi_device *dev)
>> +{
>> + 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_read8_reg(chip, TPM_INT_ENABLE, &intmask, 1);
>> + if (err < 0)
>> + goto _irq_set;
>> +
>> + intmask |= TPM_INTF_CMD_READY_INT
>> + | TPM_INTF_FIFO_AVALAIBLE_INT
>> + | TPM_INTF_WAKE_UP_READY_INT
>> + | TPM_INTF_LOC4SOFTRELEASE_INT
>> + | TPM_INTF_LOCALITY_CHANGE_INT
>> + | TPM_INTF_STS_VALID_INT
>> + | TPM_INTF_DATA_AVAIL_INT;
>> +
>> + err = spi_write8_reg(chip, TPM_INT_ENABLE, &intmask, 1);
>> + if (err < 0)
>> + goto _irq_set;
>> +
>> + intmask = TPM_GLOBAL_INT_ENABLE;
>> + err = spi_write8_reg(chip, TPM_INT_ENABLE + 3, &intmask, 1);
>> + if (err < 0)
>> + goto _irq_set;
>> +
>> + err = spi_read8_reg(chip, TPM_INT_STATUS, &intmask, 1);
>> + if (err < 0)
>> + goto _irq_set;
>> +
>> + chip->vendor.irq = interrupts;
>> +
>> + tpm_gen_interrupt(chip);
>> + }
>> +
>> + tpm_get_timeouts(chip);
>> +
>> + /* attach chip datas to client */
>> + spi_set_drvdata(dev, chip);
>> + platform_data->bchipf = false;
>> +
>> + pr_info("TPM SPI Initialized\n");
>> + return 0;
>> +_irq_set:
>> + free_irq(gpio_to_irq(platform_data->io_serirq), chip);
>> +_gpio_init2:
>> + if (platform_data && interrupts)
>> + gpio_free(platform_data->io_serirq);
>> +_gpio_init1:
>> + if (platform_data && power_mgt)
>> + gpio_free(platform_data->io_lpcpd);
>> +_tpm_clean_response:
>> + tpm_remove_hardware(chip->dev);
>> + if (platform_data->tpm_spi_buffer[1] != NULL) {
>> + kfree(platform_data->tpm_spi_buffer[1]);
>> + platform_data->tpm_spi_buffer[1] = NULL;
>> + }
>> +_tpm_clean_answer:
>> + if (platform_data->tpm_spi_buffer[0] != NULL) {
>> + kfree(platform_data->tpm_spi_buffer[0]);
>> + platform_data->tpm_spi_buffer[0] = NULL;
>> + }
>> +
>> + platform_data->bchipf = true;
>> +end:
>> + pr_info("TPM SPI initialisation fail\n");
>> + return err;
>> +}
>> +
>> +/*
>> + * tpm_st33_spi_remove remove the TPM device
>> + * @param: client, the spi_device drescription (TPM SPI description).
>> + clear_bit(0, &chip->is_open);
>> + * @return: 0 in case of success.
>> + */
>> +static int tpm_st33_spi_remove(struct spi_device *client)
>> +{
>> + struct tpm_chip *chip = (struct tpm_chip *)spi_get_drvdata(client);
>> + struct st33zp24_platform_data *pin_infos =
>> + ((struct spi_device *)chip->vendor.iobase)->dev.platform_data;
>> +
>> + if (pin_infos != NULL) {
>> + gpio_free(pin_infos->io_lpcpd);
>> +
>> + /* Check if chip has been previously clean */
>> + if (pin_infos->bchipf != true)
>> + tpm_remove_hardware(chip->dev);
>> + if (pin_infos->tpm_spi_buffer[1] != NULL) {
>> + kfree(pin_infos->tpm_spi_buffer[1]);
>> + pin_infos->tpm_spi_buffer[1] = NULL;
>> + }
>> + if (pin_infos->tpm_spi_buffer[0] != NULL) {
>> + kfree(pin_infos->tpm_spi_buffer[0]);
>> + pin_infos->tpm_spi_buffer[0] = NULL;
>> + }
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +#ifdef CONFIG_PM_SLEEP
>> +/*
>> + * tpm_st33_spi_pm_suspend suspend the TPM device
>> + * Added: Work around when suspend and no tpm application is running, suspend
>> + * may fail because chip->data_buffer is not set (only set in tpm_open in Linux
>> + * TPM core)
>> + * @return: 0 in case of success.
>> + */
>> +static int tpm_st33_spi_pm_suspend(struct device *dev)
>> +{
>> + struct tpm_chip *chip = dev_get_drvdata(dev);
>> + struct st33zp24_platform_data *pin_infos = dev->platform_data;
>> + int ret = 0;
>> +
>> + if (power_mgt)
>> + gpio_set_value(pin_infos->io_lpcpd, 0);
>> + else {
>> + if (chip->data_buffer == NULL)
>> + chip->data_buffer = pin_infos->tpm_spi_buffer[0];
>> + ret = tpm_pm_suspend(dev);
>> + }
>> + return ret;
>> +} /* tpm_st33_spi_suspend() */
>> +
>> +/*
>> + * tpm_st33_spi_pm_resume resume the TPM device
>> + * @param: spi, the spi_device drescription (TPM SPI description).
>> + * @return: 0 in case of success.
>> + */
>> +static int tpm_st33_spi_pm_resume(struct device *dev)
>> +{
>> + struct tpm_chip *chip = dev_get_drvdata(dev);
>> + struct st33zp24_platform_data *pin_infos = dev->platform_data;
>> +
>> + int ret = 0;
>> + if (power_mgt) {
>> + gpio_set_value(pin_infos->io_lpcpd, 1);
>> + ret = wait_for_serirq_timeout(chip,
>> + (chip->vendor.status(chip) &&
>> + TPM_STS_VALID) == TPM_STS_VALID,
>> + chip->vendor.timeout_b);
>> + } else {
>> + if (chip->data_buffer == NULL)
>> + chip->data_buffer = pin_infos->tpm_spi_buffer[0];
>> + ret = tpm_pm_resume(dev);
>> + if (!ret)
>> + tpm_do_selftest(chip);
>> + }
>> + return ret;
>> +} /* tpm_st33_spi_pm_resume() */
>> +#endif
>> +
>> +static SIMPLE_DEV_PM_OPS(tpm_st33_spi_ops, tpm_st33_spi_pm_suspend,
>> + tpm_st33_spi_pm_resume);
>> +static struct spi_driver tpm_st33_spi_driver = {
>> + .driver = {
>> + .owner = THIS_MODULE,
>> + .name = TPM_ST33_SPI,
>> + .pm = &tpm_st33_spi_ops,
>> + },
>> + .probe = tpm_st33_spi_probe,
>> + .remove = tpm_st33_spi_remove,
>> +};
>> +
>> +module_spi_driver(tpm_st33_spi_driver);
>> +
>> +MODULE_AUTHOR("Christophe Ricard (tpmsupport@...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..4ae5ba6
>> --- /dev/null
>> +++ b/drivers/char/tpm/tpm_spi_stm_st33.h
>> @@ -0,0 +1,61 @@
>> +/*
>> + * STMicroelectronics TPM SPI Linux driver for TPM ST33NP18
>> + * Copyright (C) 2009, 2010 STMicroelectronics
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License as published by
>> + * the Free Software Foundation; either version 2 of the License, or
>> + * (at your option) any later version.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> + * GNU General Public License for more details.
>> + *
>> + * You should have received a copy of the GNU General Public License along
>> + * with this program; if not, write to the Free Software Foundation, Inc.,
>> + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
>> + *
>> + * STMicroelectronics version 1.2.0, Copyright (C) 2010
>> + * STMicroelectronics comes with ABSOLUTELY NO WARRANTY.
>> + * This is free software, and you are welcome to redistribute it
>> + * under certain conditions.
>> + *
>> + * @Author: Christophe RICARD tpmsupport@...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__
>> +
>> +#define TPM_ACCESS (0x0)
>> +#define TPM_STS (0x18)
>> +#define TPM_DATA_FIFO (0x24)
>> +#define TPM_HASH_DATA (0x24)
>> +#define TPM_INTF_CAPABILITY (0x14)
>> +#define TPM_INT_STATUS (0x10)
>> +#define TPM_INT_ENABLE (0x08)
>> +
>> +#define TPM_DUMMY_BYTE 0x00
>> +#define TPM_WRITE_DIRECTION 0x80
>> +#define TPM_HEADER_SIZE 10
>> +#define TPM_BUFSIZE 2048
>> +
>> +#define LOCALITY0 0
>> +
>> +#define MAX_SPI_LATENCY 15
>> +
>> +#define TPM_ST33_SPI "st33zp24_spi"
>> +
>> +struct st33zp24_platform_data {
>> + int io_serirq;
>> + int io_lpcpd;
>> + int latency;
>> + bool bchipf;
>> + u8 *tpm_spi_buffer[2]; /* 0 Request 1 Response */
>> + struct completion irq_detection;
>> +};
>> +
>> +#endif /* __STM_ST33_TPM_SPI_MAIN_H__ */
>> --
>> 1.7.1
>>
>>
>> ------------------------------------------------------------------------------
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