diff options
author | Mathias Leblanc <mathias.leblanc@st.com> | 2012-11-28 18:22:24 +0100 |
---|---|---|
committer | Kent Yoder <key@linux.vnet.ibm.com> | 2013-02-05 16:38:22 +0100 |
commit | 251a7b08213af82e40e4a70cac056e245853c410 (patch) | |
tree | b4dd531fc063612ee7f3f3235605ffa3b7e6ec12 /drivers | |
parent | char/tpm: Use true and false for bools (diff) | |
download | linux-251a7b08213af82e40e4a70cac056e245853c410.tar.xz linux-251a7b08213af82e40e4a70cac056e245853c410.zip |
TPM: STMicroelectronics ST33 I2C KERNEL 3.x
* STMicroelectronics version 1.2.0, Copyright (C) 2010
* STMicroelectronics comes with ABSOLUTELY NO WARRANTY.
* This is free software, and you are welcome to redistribute it
* under certain conditions.
This is the driver for TPM chip from ST Microelectronics.
If you have a TPM security chip from STMicroelectronics working with
an I2C, in menuconfig or .config choose the tpm driver on
device --> tpm and activate the protocol of your choice before compiling
the kernel.
The driver will be accessible from within Linux.
Tested on linux x86/x64 on kernel 3.x
Signed-off-by: Mathias Leblanc <mathias.leblanc@st.com>
Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/char/tpm/tpm_stm_st33_i2c.c | 903 | ||||
-rw-r--r-- | drivers/char/tpm/tpm_stm_st33_i2c.h | 81 |
2 files changed, 984 insertions, 0 deletions
diff --git a/drivers/char/tpm/tpm_stm_st33_i2c.c b/drivers/char/tpm/tpm_stm_st33_i2c.c new file mode 100644 index 000000000000..32cdd5e92141 --- /dev/null +++ b/drivers/char/tpm/tpm_stm_st33_i2c.c @@ -0,0 +1,903 @@ +/* + * STMicroelectronics TPM I2C Linux driver for TPM ST33ZP24 + * Copyright (C) 2009, 2010 STMicroelectronics + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * + * STMicroelectronics version 1.2.0, Copyright (C) 2010 + * STMicroelectronics comes with ABSOLUTELY NO WARRANTY. + * This is free software, and you are welcome to redistribute it + * under certain conditions. + * + * @Author: Christophe RICARD tpmsupport@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/i2c/tpm_stm_st33_i2c.h> + +#include "tpm_stm_st33_i2c.h" + +enum stm33zp24_access { + TPM_ACCESS_VALID = 0x80, + TPM_ACCESS_ACTIVE_LOCALITY = 0x20, + TPM_ACCESS_REQUEST_PENDING = 0x04, + TPM_ACCESS_REQUEST_USE = 0x02, +}; + +enum stm33zp24_status { + TPM_STS_VALID = 0x80, + TPM_STS_COMMAND_READY = 0x40, + TPM_STS_GO = 0x20, + TPM_STS_DATA_AVAIL = 0x10, + TPM_STS_DATA_EXPECT = 0x08, +}; + +enum stm33zp24_int_flags { + TPM_GLOBAL_INT_ENABLE = 0x80, + TPM_INTF_CMD_READY_INT = 0x080, + TPM_INTF_FIFO_AVALAIBLE_INT = 0x040, + TPM_INTF_WAKE_UP_READY_INT = 0x020, + TPM_INTF_LOCALITY_CHANGE_INT = 0x004, + TPM_INTF_STS_VALID_INT = 0x002, + TPM_INTF_DATA_AVAIL_INT = 0x001, +}; + +enum tis_defaults { + TIS_SHORT_TIMEOUT = 750, + TIS_LONG_TIMEOUT = 2000, +}; + +/* + * write8_reg + * Send byte to the TIS register according to the ST33ZP24 I2C protocol. + * @param: tpm_register, the tpm tis register where the data should be written + * @param: tpm_data, the tpm_data to write inside the tpm_register + * @param: tpm_size, The length of the data + * @return: Returns negative errno, or else the number of bytes written. + */ +static int write8_reg(struct i2c_client *client, u8 tpm_register, + u8 *tpm_data, u16 tpm_size) +{ + u8 data; + int value = 0; + struct st33zp24_platform_data *pin_infos; + + pin_infos = client->dev.platform_data; + + data = tpm_register; + memcpy(pin_infos->tpm_i2c_buffer[0], &data, sizeof(data)); + memcpy(pin_infos->tpm_i2c_buffer[0] + 1, tpm_data, tpm_size); + value = i2c_master_send(client, pin_infos->tpm_i2c_buffer[0], + tpm_size + 1); + return value; +} /* write8_reg() */ + +/* + * read8_reg + * Recv byte from the TIS register according to the ST33ZP24 I2C protocol. + * @param: tpm_register, the tpm tis register where the data should be read + * @param: tpm_data, the TPM response + * @param: tpm_size, tpm TPM response size to read. + * @return: number of byte read successfully: should be one if success. + */ +static int read8_reg(struct i2c_client *client, u8 tpm_register, + u8 *tpm_data, int tpm_size) +{ + u8 status = 0; + u8 data; + struct st33zp24_platform_data *pin_infos; + + pin_infos = client->dev.platform_data; + + data = TPM_DUMMY_BYTE; + status = write8_reg(client, tpm_register, &data, 1); + if (status == 2) + status = i2c_master_recv(client, tpm_data, tpm_size); + return status; +} /* read8_reg() */ + +/* + * I2C_WRITE_DATA + * Send byte to the TIS register according to the ST33ZP24 I2C protocol. + * @param: client, 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(client, tpm_register, tpm_data, tpm_size) \ + (write8_reg(client, 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, 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(client, tpm_register, tpm_data, tpm_size) \ + (read8_reg(client, tpm_register, tpm_data, tpm_size)) + +/* + * clear_interruption + * clear the TPM interrupt register. + * @param: tpm, the chip description + */ +static void clear_interruption(struct i2c_client *client) +{ + u8 interrupt; + I2C_READ_DATA(client, TPM_INT_STATUS, &interrupt, 1); + I2C_WRITE_DATA(client, TPM_INT_STATUS, &interrupt, 1); + I2C_READ_DATA(client, TPM_INT_STATUS, &interrupt, 1); +} /* clear_interruption() */ + +/* + * _wait_for_interrupt_serirq_timeout + * @param: tpm, the chip description + * @param: timeout, the timeout of the interrupt + * @return: the status of the interruption. + */ +static long _wait_for_interrupt_serirq_timeout(struct tpm_chip *chip, + unsigned long timeout) +{ + long status; + struct i2c_client *client; + struct st33zp24_platform_data *pin_infos; + + client = (struct i2c_client *) chip->vendor.iobase; + pin_infos = client->dev.platform_data; + + status = wait_for_completion_interruptible_timeout( + &pin_infos->irq_detection, + timeout); + if (status > 0) + enable_irq(gpio_to_irq(pin_infos->io_serirq)); + gpio_direction_input(pin_infos->io_serirq); + + return status; +} /* wait_for_interrupt_serirq_timeout() */ + +int wait_for_serirq_timeout(struct tpm_chip *chip, bool condition, + unsigned long timeout) +{ + int status = 2; + struct i2c_client *client; + struct st33zp24_platform_data *pin_infos; + + client = (struct i2c_client *) chip->vendor.iobase; + pin_infos = client->dev.platform_data; + + status = _wait_for_interrupt_serirq_timeout(chip, timeout); + if (!status) { + status = -EBUSY; + } else{ + clear_interruption(client); + if (condition) + status = 1; + } + return status; +} + +/* + * tpm_stm_i2c_cancel, cancel is not implemented. + * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h + */ +static void tpm_stm_i2c_cancel(struct tpm_chip *chip) +{ + struct i2c_client *client; + u8 data; + + client = (struct i2c_client *) chip->vendor.iobase; + + data = TPM_STS_COMMAND_READY; + I2C_WRITE_DATA(client, TPM_STS, &data, 1); + if (chip->vendor.irq) + wait_for_serirq_timeout(chip, 1, chip->vendor.timeout_a); +} /* tpm_stm_i2c_cancel() */ + +/* + * tpm_stm_spi_status return the TPM_STS register + * @param: chip, the tpm chip description + * @return: the TPM_STS register value. + */ +static u8 tpm_stm_i2c_status(struct tpm_chip *chip) +{ + struct i2c_client *client; + u8 data; + client = (struct i2c_client *) chip->vendor.iobase; + + I2C_READ_DATA(client, TPM_STS, &data, 1); + return data; +} /* tpm_stm_i2c_status() */ + + +/* + * check_locality if the locality is active + * @param: chip, the tpm chip description + * @return: the active locality or -EACCESS. + */ +static int check_locality(struct tpm_chip *chip) +{ + struct i2c_client *client; + u8 data; + u8 status; + + client = (struct i2c_client *) chip->vendor.iobase; + + status = I2C_READ_DATA(client, TPM_ACCESS, &data, 1); + if (status && (data & + (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) == + (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) + return chip->vendor.locality; + + return -EACCES; + +} /* check_locality() */ + +/* + * request_locality request the TPM locality + * @param: chip, the chip description + * @return: the active locality or EACCESS. + */ +static int request_locality(struct tpm_chip *chip) +{ + unsigned long stop; + long rc; + struct i2c_client *client; + u8 data; + + client = (struct i2c_client *) chip->vendor.iobase; + + if (check_locality(chip) == chip->vendor.locality) + return chip->vendor.locality; + + data = TPM_ACCESS_REQUEST_USE; + rc = I2C_WRITE_DATA(client, TPM_ACCESS, &data, 1); + if (rc < 0) + goto end; + + if (chip->vendor.irq) { + rc = wait_for_serirq_timeout(chip, (check_locality + (chip) >= 0), + chip->vendor.timeout_a); + if (rc > 0) + return chip->vendor.locality; + } else{ + stop = jiffies + chip->vendor.timeout_a; + do { + if (check_locality(chip) >= 0) + return chip->vendor.locality; + msleep(TPM_TIMEOUT); + } while (time_before(jiffies, stop)); + } + rc = -EACCES; +end: + return rc; +} /* request_locality() */ + +/* + * release_locality release the active locality + * @param: chip, the tpm chip description. + */ +static void release_locality(struct tpm_chip *chip) +{ + struct i2c_client *client; + u8 data; + + client = (struct i2c_client *) chip->vendor.iobase; + data = TPM_ACCESS_ACTIVE_LOCALITY; + + I2C_WRITE_DATA(client, TPM_ACCESS, &data, 1); +} + +/* + * get_burstcount return the burstcount address 0x19 0x1A + * @param: chip, the chip description + * return: the burstcount. + */ +static int get_burstcount(struct tpm_chip *chip) +{ + unsigned long stop; + int burstcnt, status; + u8 tpm_reg, temp; + + struct i2c_client *client = (struct i2c_client *) chip->vendor.iobase; + + stop = jiffies + chip->vendor.timeout_d; + do { + tpm_reg = TPM_STS + 1; + status = I2C_READ_DATA(client, tpm_reg, &temp, 1); + if (status < 0) + goto end; + + tpm_reg = tpm_reg + 1; + burstcnt = temp; + status = I2C_READ_DATA(client, tpm_reg, &temp, 1); + if (status < 0) + goto end; + + burstcnt |= temp << 8; + if (burstcnt) + return burstcnt; + msleep(TPM_TIMEOUT); + } while (time_before(jiffies, stop)); + +end: + return -EBUSY; +} /* get_burstcount() */ + +/* + * wait_for_stat wait for a TPM_STS value + * @param: chip, the tpm chip description + * @param: mask, the value mask to wait + * @param: timeout, the timeout + * @param: queue, the wait queue. + * @return: the tpm status, 0 if success, -ETIME if timeout is reached. + */ +static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout, + wait_queue_head_t *queue) +{ + unsigned long stop; + long rc; + u8 status; + + if (chip->vendor.irq) { + rc = wait_for_serirq_timeout(chip, ((tpm_stm_i2c_status + (chip) & mask) == + mask), timeout); + if (rc > 0) + return 0; + } else{ + stop = jiffies + timeout; + do { + msleep(TPM_TIMEOUT); + status = tpm_stm_i2c_status(chip); + if ((status & mask) == mask) + return 0; + } while (time_before(jiffies, stop)); + } + return -ETIME; +} /* wait_for_stat() */ + +/* + * recv_data receive data + * @param: chip, the tpm chip description + * @param: buf, the buffer where the data are received + * @param: count, the number of data to receive + * @return: the number of bytes read from TPM FIFO. + */ +static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count) +{ + int size = 0, burstcnt, len; + struct i2c_client *client; + + client = (struct i2c_client *) chip->vendor.iobase; + + while (size < count && + wait_for_stat(chip, + TPM_STS_DATA_AVAIL | TPM_STS_VALID, + chip->vendor.timeout_c, + &chip->vendor.read_queue) + == 0) { + burstcnt = get_burstcount(chip); + len = min_t(int, burstcnt, count - size); + I2C_READ_DATA(client, TPM_DATA_FIFO, buf + size, len); + size += len; + } + return size; +} + +/* + * tpm_ioserirq_handler the serirq irq handler + * @param: irq, the tpm chip description + * @param: dev_id, the description of the chip + * @return: the status of the handler. + */ +static irqreturn_t tpm_ioserirq_handler(int irq, void *dev_id) +{ + struct tpm_chip *chip = dev_id; + struct i2c_client *client; + struct st33zp24_platform_data *pin_infos; + + disable_irq_nosync(irq); + + client = (struct i2c_client *) chip->vendor.iobase; + pin_infos = client->dev.platform_data; + + complete(&pin_infos->irq_detection); + return IRQ_HANDLED; +} /* tpm_ioserirq_handler() */ + + +/* + * tpm_stm_i2c_send send TPM commands through the I2C bus. + * + * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h + * @param: buf, the buffer to send. + * @param: count, the number of bytes to send. + * @return: In case of success the number of bytes sent. + * In other case, a < 0 value describing the issue. + */ +static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf, + size_t len) +{ + u32 ret = 0, ordinal, + status, + burstcnt = 0, i, size; + u8 data; + struct i2c_client *client; + struct st33zp24_platform_data *pin_infos; + + if (chip == NULL) + return -EBUSY; + if (len < TPM_HEADER_SIZE) + return -EBUSY; + + client = (struct i2c_client *)chip->vendor.iobase; + pin_infos = client->dev.platform_data; + + ordinal = be32_to_cpu(*((__be32 *) (buf + 6))); + + client->flags = 0; + + ret = request_locality(chip); + if (ret < 0) + return ret; + + status = tpm_stm_i2c_status(chip); + if ((status & TPM_STS_COMMAND_READY) == 0) { + tpm_stm_i2c_cancel(chip); + if (wait_for_stat + (chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b, + &chip->vendor.int_queue) < 0) { + ret = -ETIME; + goto out_err; + } + } + + for (i = 0 ; i < len - 1 ;) { + burstcnt = get_burstcount(chip); + size = min_t(int, len - i - 1, burstcnt); + ret = I2C_WRITE_DATA(client, TPM_DATA_FIFO, buf, size); + if (ret < 0) + goto out_err; + + i += size; + } + + status = tpm_stm_i2c_status(chip); + if ((status & TPM_STS_DATA_EXPECT) == 0) { + ret = -EIO; + goto out_err; + } + + ret = I2C_WRITE_DATA(client, TPM_DATA_FIFO, buf + len - 1, 1); + if (ret < 0) + goto out_err; + + status = tpm_stm_i2c_status(chip); + if ((status & TPM_STS_DATA_EXPECT) != 0) { + ret = -EIO; + goto out_err; + } + + data = TPM_STS_GO; + I2C_WRITE_DATA(client, TPM_STS, &data, 1); + + return len; +out_err: + tpm_stm_i2c_cancel(chip); + release_locality(chip); + return ret; +} + +/* + * tpm_stm_i2c_recv received TPM response through the I2C bus. + * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h. + * @param: buf, the buffer to store datas. + * @param: count, the number of bytes to send. + * @return: In case of success the number of bytes received. + * In other case, a < 0 value describing the issue. + */ +static int tpm_stm_i2c_recv(struct tpm_chip *chip, unsigned char *buf, + size_t count) +{ + int size = 0; + int expected; + + struct i2c_client *client; + struct st33zp24_platform_data *pin_infos; + + client = (struct i2c_client *)chip->vendor.iobase; + pin_infos = client->dev.platform_data; + + + if (chip == NULL) + return -EBUSY; + + if (count < TPM_HEADER_SIZE) { + size = -EIO; + goto out; + } + + size = recv_data(chip, buf, TPM_HEADER_SIZE); + if (size < TPM_HEADER_SIZE) { + dev_err(chip->dev, "Unable to read header\n"); + goto out; + } + + expected = be32_to_cpu(*(__be32 *) (buf + 2)); + if (expected > count) { + size = -EIO; + goto out; + } + + size += recv_data(chip, &buf[TPM_HEADER_SIZE], + expected - TPM_HEADER_SIZE); + if (size < expected) { + dev_err(chip->dev, "Unable to read remainder of result\n"); + size = -ETIME; + goto out; + } + +out: + chip->vendor.cancel(chip); + release_locality(chip); + return size; +} + +static const struct file_operations tpm_st33_i2c_fops = { + .owner = THIS_MODULE, + .llseek = no_llseek, + .read = tpm_read, + .write = tpm_write, + .open = tpm_open, + .release = tpm_release, +}; + +static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL); +static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL); +static DEVICE_ATTR(enabled, S_IRUGO, tpm_show_enabled, NULL); +static DEVICE_ATTR(active, S_IRUGO, tpm_show_active, NULL); +static DEVICE_ATTR(owned, S_IRUGO, tpm_show_owned, NULL); +static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated, NULL); +static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps_1_2, NULL); +static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel); + +static struct attribute *stm_tpm_attrs[] = { + &dev_attr_pubek.attr, + &dev_attr_pcrs.attr, + &dev_attr_enabled.attr, + &dev_attr_active.attr, + &dev_attr_owned.attr, + &dev_attr_temp_deactivated.attr, + &dev_attr_caps.attr, + &dev_attr_cancel.attr, NULL, +}; + +static struct attribute_group stm_tpm_attr_grp = { + .attrs = stm_tpm_attrs +}; + +static struct tpm_vendor_specific st_i2c_tpm = { + .send = tpm_stm_i2c_send, + .recv = tpm_stm_i2c_recv, + .cancel = tpm_stm_i2c_cancel, + .status = tpm_stm_i2c_status, + .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID, + .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID, + .req_canceled = TPM_STS_COMMAND_READY, + .attr_group = &stm_tpm_attr_grp, + .miscdev = {.fops = &tpm_st33_i2c_fops,}, +}; + +static int interrupts ; +module_param(interrupts, int, 0444); +MODULE_PARM_DESC(interrupts, "Enable interrupts"); + +static int power_mgt = 1; +module_param(power_mgt, int, 0444); +MODULE_PARM_DESC(power_mgt, "Power Management"); + +/* + * tpm_st33_i2c_probe initialize the TPM device + * @param: client, the i2c_client drescription (TPM I2C description). + * @param: id, the i2c_device_id struct. + * @return: 0 in case of success. + * -1 in other case. + */ +static int +tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id) +{ + u32 err; + u8 intmask; + struct tpm_chip *chip; + struct st33zp24_platform_data *platform_data; + + err = 0; + + if (client == NULL) { + dev_info(&client->dev, "client is NULL. exiting.\n"); + err = -ENODEV; + goto end; + } + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { + dev_info(&client->dev, "client not i2c capable\n"); + err = -ENODEV; + goto end; + } + + chip = tpm_register_hardware(&client->dev, &st_i2c_tpm); + if (!chip) { + dev_info(&client->dev, "fail chip\n"); + err = -ENODEV; + goto end; + } + + platform_data = client->dev.platform_data; + platform_data->tpm_i2c_buffer[0] = + kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL); + if (platform_data->tpm_i2c_buffer[0] == NULL) { + err = -ENOMEM; + goto _tpm_clean_answer; + } + platform_data->tpm_i2c_buffer[1] = + kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL); + if (platform_data->tpm_i2c_buffer[1] == NULL) { + err = -ENOMEM; + goto _tpm_clean_response; + } + + chip->vendor.iobase = client; + + chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT); + chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT); + chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT); + chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT); + + chip->vendor.locality = LOCALITY0; + + if (power_mgt) { + err = gpio_request(platform_data->io_lpcpd, "TPM IO_LPCPD"); + if (err) + goto _gpio_init1; + gpio_set_value(platform_data->io_lpcpd, 1); + } + + if (interrupts) { + init_completion(&platform_data->irq_detection); + if (request_locality(chip) != LOCALITY0) { + err = -ENODEV; + goto _tpm_clean_response; + } + err = gpio_request(platform_data->io_serirq, "TPM IO_SERIRQ"); + if (err) + goto _gpio_init2; + + clear_interruption(client); + err = request_irq(gpio_to_irq(platform_data->io_serirq), + &tpm_ioserirq_handler, + IRQF_TRIGGER_HIGH, + "TPM SERIRQ management", chip); + if (err < 0) { + dev_err(chip->dev , "TPM SERIRQ signals %d not available\n", + gpio_to_irq(platform_data->io_serirq)); + goto _irq_set; + } + + err = I2C_READ_DATA(client, TPM_INT_ENABLE, &intmask, 1); + if (err < 0) + goto _irq_set; + + intmask |= TPM_INTF_CMD_READY_INT + | TPM_INTF_FIFO_AVALAIBLE_INT + | TPM_INTF_WAKE_UP_READY_INT + | TPM_INTF_LOCALITY_CHANGE_INT + | TPM_INTF_STS_VALID_INT + | TPM_INTF_DATA_AVAIL_INT; + + err = I2C_WRITE_DATA(client, TPM_INT_ENABLE, &intmask, 1); + if (err < 0) + goto _irq_set; + + intmask = TPM_GLOBAL_INT_ENABLE; + err = I2C_WRITE_DATA(client, (TPM_INT_ENABLE + 3), &intmask, 1); + if (err < 0) + goto _irq_set; + + err = I2C_READ_DATA(client, TPM_INT_STATUS, &intmask, 1); + if (err < 0) + goto _irq_set; + + chip->vendor.irq = interrupts; + + tpm_gen_interrupt(chip); + } + + tpm_get_timeouts(chip); + + i2c_set_clientdata(client, chip); + platform_data->bChipF = false; + + dev_info(chip->dev, "TPM I2C Initialized\n"); + return 0; +_irq_set: + free_irq(gpio_to_irq(platform_data->io_serirq), (void *) chip); +_gpio_init2: + if (platform_data && interrupts) + gpio_free(platform_data->io_serirq); +_gpio_init1: + if (platform_data && power_mgt) + gpio_free(platform_data->io_lpcpd); +_tpm_clean_response: + tpm_remove_hardware(chip->dev); + if (platform_data->tpm_i2c_buffer[1] != NULL) { + kzfree(platform_data->tpm_i2c_buffer[1]); + platform_data->tpm_i2c_buffer[1] = NULL; + } +_tpm_clean_answer: + if (platform_data->tpm_i2c_buffer[0] != NULL) { + kzfree(platform_data->tpm_i2c_buffer[0]); + platform_data->tpm_i2c_buffer[0] = NULL; + } + + platform_data->bChipF = true; +end: + pr_info("TPM I2C initialisation fail\n"); + return err; +} + +/* + * tpm_st33_i2c_remove remove the TPM device + * @param: client, the i2c_client drescription (TPM I2C description). + clear_bit(0, &chip->is_open); + * @return: 0 in case of success. + */ +static __devexit int tpm_st33_i2c_remove(struct i2c_client *client) +{ + struct tpm_chip *chip = (struct tpm_chip *)i2c_get_clientdata(client); + struct st33zp24_platform_data *pin_infos = + ((struct i2c_client *) chip->vendor.iobase)->dev.platform_data; + + if (pin_infos != NULL) { + free_irq(pin_infos->io_serirq, chip); + + gpio_free(pin_infos->io_serirq); + gpio_free(pin_infos->io_lpcpd); + + if (pin_infos->bChipF != true) + tpm_remove_hardware(chip->dev); + if (pin_infos->tpm_i2c_buffer[1] != NULL) { + kzfree(pin_infos->tpm_i2c_buffer[1]); + pin_infos->tpm_i2c_buffer[1] = NULL; + } + if (pin_infos->tpm_i2c_buffer[0] != NULL) { + kzfree(pin_infos->tpm_i2c_buffer[0]); + pin_infos->tpm_i2c_buffer[0] = NULL; + } + } + + return 0; +} + +/* + * tpm_st33_i2c_pm_suspend suspend the TPM device + * Added: Work around when suspend and no tpm application is running, suspend + * may fail because chip->data_buffer is not set (only set in tpm_open in Linux + * TPM core) + * @param: client, the i2c_client drescription (TPM I2C description). + * @param: mesg, the power management message. + * @return: 0 in case of success. + */ +static int tpm_st33_i2c_pm_suspend(struct i2c_client *client, pm_message_t mesg) +{ + struct tpm_chip *chip = + (struct tpm_chip *)i2c_get_clientdata(client); + struct st33zp24_platform_data *pin_infos = + ((struct i2c_client *)chip->vendor.iobase)->dev.platform_data; + int ret = 0; + + if (power_mgt) + gpio_set_value(pin_infos->io_lpcpd, 0); + else{ + if (chip->data_buffer == NULL) + chip->data_buffer = pin_infos->tpm_i2c_buffer[0]; + ret = tpm_pm_suspend(&client->dev); + } + return ret; +} /* tpm_st33_i2c_suspend() */ + +/* + * tpm_st33_i2c_pm_resume resume the TPM device + * @param: client, the i2c_client drescription (TPM I2C description). + * @return: 0 in case of success. + */ +static int tpm_st33_i2c_pm_resume(struct i2c_client *client) +{ + struct tpm_chip *chip = + (struct tpm_chip *)i2c_get_clientdata(client); + struct st33zp24_platform_data *pin_infos = + ((struct i2c_client *)chip->vendor.iobase)->dev.platform_data; + + int ret = 0; + + if (power_mgt) { + gpio_set_value(pin_infos->io_lpcpd, 1); + ret = wait_for_serirq_timeout(chip, + (chip->vendor.status(chip) && + TPM_STS_VALID) == TPM_STS_VALID, + chip->vendor.timeout_b); + } else{ + if (chip->data_buffer == NULL) + chip->data_buffer = pin_infos->tpm_i2c_buffer[0]; + ret = tpm_pm_resume(&client->dev); + if (!ret) + tpm_do_selftest(chip); + } + return ret; +} /* tpm_st33_i2c_pm_resume() */ + +static const struct i2c_device_id tpm_st33_i2c_id[] = { + {TPM_ST33_I2C, 0}, + {} +}; + +MODULE_DEVICE_TABLE(i2c, tpm_st33_i2c_id); + +static struct i2c_driver tpm_st33_i2c_driver = { + .driver = { + .owner = THIS_MODULE, + .name = TPM_ST33_I2C, + }, + .probe = tpm_st33_i2c_probe, + .remove = tpm_st33_i2c_remove, + .resume = tpm_st33_i2c_pm_resume, + .suspend = tpm_st33_i2c_pm_suspend, + .id_table = tpm_st33_i2c_id +}; + +/* + * tpm_st33_i2c_init initialize driver + * @return: 0 if successful, else non zero value. + */ +static int __init tpm_st33_i2c_init(void) +{ + return i2c_add_driver(&tpm_st33_i2c_driver); +} + +/* + * tpm_st33_i2c_exit The kernel calls this function during unloading the + * module or during shut down process + */ +static void __exit tpm_st33_i2c_exit(void) +{ + i2c_del_driver(&tpm_st33_i2c_driver); +} + +module_init(tpm_st33_i2c_init); +module_exit(tpm_st33_i2c_exit); + +MODULE_AUTHOR("Christophe Ricard (tpmsupport@st.com)"); +MODULE_DESCRIPTION("STM TPM I2C ST33 Driver"); +MODULE_VERSION("1.2.0"); diff --git a/drivers/char/tpm/tpm_stm_st33_i2c.h b/drivers/char/tpm/tpm_stm_st33_i2c.h new file mode 100644 index 000000000000..d390542db869 --- /dev/null +++ b/drivers/char/tpm/tpm_stm_st33_i2c.h @@ -0,0 +1,81 @@ +/* + * STMicroelectronics TPM I2C Linux driver for TPM ST33ZP24 + * Copyright (C) 2009, 2010 STMicroelectronics + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * + * STMicroelectronics version 1.2.0, Copyright (C) 2010 + * STMicroelectronics comes with ABSOLUTELY NO WARRANTY. + * This is free software, and you are welcome to redistribute it + * under certain conditions. + * + * @Author: Christophe RICARD tpmsupport@st.com + * + * @File: stm_st33_tpm_i2c.h + * + * @Date: 09/15/2010 + */ +#ifndef __STM_ST33_TPM_I2C_MAIN_H__ +#define __STM_ST33_TPM_I2C_MAIN_H__ + +#include <linux/pci.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/i2c.h> +#include <linux/fs.h> +#include <linux/miscdevice.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/init.h> +#include <linux/wait.h> +#include <linux/string.h> +#include <linux/interrupt.h> +#include <linux/spinlock.h> +#include <linux/sysfs.h> +#include <linux/gpio.h> +#include <linux/sched.h> +#include <linux/uaccess.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/sched.h> + +#include "tpm.h" + +#define MINOR_NUM_I2C 224 + +#define TPM_ACCESS (0x0) +#define TPM_STS (0x18) +#define TPM_HASH_END (0x20) +#define TPM_DATA_FIFO (0x24) +#define TPM_HASH_DATA (0x24) +#define TPM_HASH_START (0x28) +#define TPM_INTF_CAPABILITY (0x14) +#define TPM_INT_STATUS (0x10) +#define TPM_INT_ENABLE (0x08) + +#define TPM_DUMMY_BYTE 0xAA +#define TPM_WRITE_DIRECTION 0x80 +#define TPM_HEADER_SIZE 10 +#define TPM_BUFSIZE 2048 + +#define LOCALITY0 0 + +struct st_tpm_hash { + int size; + u8 *data; +}; + +#endif /* __STM_ST33_TPM_I2C_MAIN_H__ */ |