Re: [tpmdd-devel] [PATCH v9 8/8] tpm: TPM 2.0 FIFO Interface

[Scot Doyle <lkml14@scotdoyle.com>]

Hi Jarkko,

On Thu, 4 Dec 2014, Jarkko Sakkinen wrote:
> From: Will Arthur <will.c.arthur@intel.com>
> 
> Detect TPM 2.0 by using the extended STS (STS3) register. For TPM 2.0,
> instead of calling tpm_get_timeouts(), assign duration and timeout
> values defined in the TPM 2.0 PTP specification.
> 
> Signed-off-by: Will Arthur <will.c.arthur@intel.com>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> ---
>  drivers/char/tpm/tpm_tis.c | 80 ++++++++++++++++++++++++++++++++++++++--------
>  1 file changed, 67 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
> index 89e1abb..71cbb2d 100644
> --- a/drivers/char/tpm/tpm_tis.c
> +++ b/drivers/char/tpm/tpm_tis.c
> @@ -1,5 +1,6 @@
>  /*
>   * Copyright (C) 2005, 2006 IBM Corporation
> + * Copyright (C) 2014 Intel Corporation
>   *
>   * Authors:
>   * Leendert van Doorn <leendert@watson.ibm.com>
> @@ -44,6 +45,10 @@ enum tis_status {
>  	TPM_STS_DATA_EXPECT = 0x08,
>  };
>  
> +enum tis_status3 {
> +	TPM_STS3_TPM2_FAM = 0x04,
> +};
> +
>  enum tis_int_flags {
>  	TPM_GLOBAL_INT_ENABLE = 0x80000000,
>  	TPM_INTF_BURST_COUNT_STATIC = 0x100,
> @@ -70,6 +75,7 @@ enum tis_defaults {
>  #define	TPM_INT_STATUS(l)		(0x0010 | ((l) << 12))
>  #define	TPM_INTF_CAPS(l)		(0x0014 | ((l) << 12))
>  #define	TPM_STS(l)			(0x0018 | ((l) << 12))
> +#define	TPM_STS3(l)			(0x001b | ((l) << 12))
>  #define	TPM_DATA_FIFO(l)		(0x0024 | ((l) << 12))
>  
>  #define	TPM_DID_VID(l)			(0x0F00 | ((l) << 12))
> @@ -363,6 +369,7 @@ static int tpm_tis_send_main(struct tpm_chip *chip, u8 *buf, size_t len)
>  {
>  	int rc;
>  	u32 ordinal;
> +	unsigned long dur;
>  
>  	rc = tpm_tis_send_data(chip, buf, len);
>  	if (rc < 0)
> @@ -374,9 +381,14 @@ static int tpm_tis_send_main(struct tpm_chip *chip, u8 *buf, size_t len)
>  
>  	if (chip->vendor.irq) {
>  		ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
> +
> +		if (chip->flags & TPM_CHIP_FLAG_TPM2)
> +			dur = tpm2_calc_ordinal_duration(chip, ordinal);
> +		else
> +			dur = tpm_calc_ordinal_duration(chip, ordinal);
> +
>  		if (wait_for_tpm_stat
> -		    (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID,
> -		     tpm_calc_ordinal_duration(chip, ordinal),
> +		    (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID, dur,
>  		     &chip->vendor.read_queue, false) < 0) {
>  			rc = -ETIME;
>  			goto out_err;
> @@ -588,6 +600,7 @@ static int tpm_tis_init(struct device *dev, acpi_handle acpi_dev_handle,
>  	int rc, i, irq_s, irq_e, probe;
>  	struct tpm_chip *chip;
>  	struct priv_data *priv;
> +	u8 sts3;
>  
>  	priv = devm_kzalloc(dev, sizeof(struct priv_data), GFP_KERNEL);
>  	if (priv == NULL)
> @@ -604,11 +617,28 @@ static int tpm_tis_init(struct device *dev, acpi_handle acpi_dev_handle,
>  	if (!chip->vendor.iobase)
>  		return -EIO;
>  
> +	sts3 = ioread8(chip->vendor.iobase + TPM_STS3(1));
> +	if ((sts3 & TPM_STS3_TPM2_FAM) == TPM_STS3_TPM2_FAM)
> +		chip->flags = TPM_CHIP_FLAG_TPM2;
> +
>  	/* 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);
> +	if (chip->flags & TPM_CHIP_FLAG_TPM2) {
> +		chip->vendor.timeout_a = usecs_to_jiffies(TPM2_TIMEOUT_A);
> +		chip->vendor.timeout_b = usecs_to_jiffies(TPM2_TIMEOUT_B);
> +		chip->vendor.timeout_c = usecs_to_jiffies(TPM2_TIMEOUT_C);
> +		chip->vendor.timeout_d = usecs_to_jiffies(TPM2_TIMEOUT_D);
> +		chip->vendor.duration[TPM_SHORT] =
> +			usecs_to_jiffies(TPM2_DURATION_SHORT);
> +		chip->vendor.duration[TPM_MEDIUM] =
> +			usecs_to_jiffies(TPM2_DURATION_MEDIUM);
> +		chip->vendor.duration[TPM_LONG] =
> +			usecs_to_jiffies(TPM2_DURATION_LONG);
> +	} else {
> +		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);
> +	}
>  
>  	if (wait_startup(chip, 0) != 0) {
>  		rc = -ENODEV;
> @@ -623,8 +653,8 @@ static int tpm_tis_init(struct device *dev, acpi_handle acpi_dev_handle,
>  	vendor = ioread32(chip->vendor.iobase + TPM_DID_VID(0));
>  	chip->vendor.manufacturer_id = vendor;
>  
> -	dev_info(dev,
> -		 "1.2 TPM (device-id 0x%X, rev-id %d)\n",
> +	dev_info(dev, "%s TPM (device-id 0x%X, rev-id %d)\n",
> +		 (chip->flags & TPM_CHIP_FLAG_TPM2) ? "2.0" : "1.2",
>  		 vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0)));
>  
>  	if (!itpm) {
> @@ -665,6 +695,23 @@ static int tpm_tis_init(struct device *dev, acpi_handle acpi_dev_handle,
>  	if (intfcaps & TPM_INTF_DATA_AVAIL_INT)
>  		dev_dbg(dev, "\tData Avail Int Support\n");
>  
> +	/* get the timeouts before testing for irqs */
> +	if (!(chip->flags & TPM_CHIP_FLAG_TPM2) && tpm_get_timeouts(chip)) {
> +		dev_err(dev, "Could not get TPM timeouts and durations\n");
> +		rc = -ENODEV;
> +		goto out_err;
> +	}
> +
> +	if (chip->flags & TPM_CHIP_FLAG_TPM2)
> +		rc = tpm2_do_selftest(chip);
> +	else
> +		rc = tpm_do_selftest(chip);
> +	if (rc) {
> +		dev_err(dev, "TPM self test failed\n");
> +		rc = -ENODEV;
> +		goto out_err;
> +	}
> +
>  	/* INTERRUPT Setup */
>  	init_waitqueue_head(&chip->vendor.read_queue);
>  	init_waitqueue_head(&chip->vendor.int_queue);

In Peter's for-james branch, commit 0e6cb01, the v1.2 calls to
tpm_get_timeouts and tpm_do_selftest were moved toward the end of 
tpm_tis_init.


> @@ -720,7 +767,10 @@ static int tpm_tis_init(struct device *dev, acpi_handle acpi_dev_handle,
>  			chip->vendor.probed_irq = 0;
>  
>  			/* Generate Interrupts */
> -			tpm_gen_interrupt(chip);
> +			if (chip->flags & TPM_CHIP_FLAG_TPM2)
> +				tpm2_gen_interrupt(chip);
> +			else
> +				tpm_gen_interrupt(chip);
>  
>  			chip->vendor.irq = chip->vendor.probed_irq;
>  
> @@ -808,14 +858,18 @@ static void tpm_tis_reenable_interrupts(struct tpm_chip *chip)
>  static int tpm_tis_resume(struct device *dev)
>  {
>  	struct tpm_chip *chip = dev_get_drvdata(dev);
> -	int ret;
> +	int ret = 0;
>  
>  	if (chip->vendor.irq)
>  		tpm_tis_reenable_interrupts(chip);
>  
> -	ret = tpm_pm_resume(dev);
> -	if (!ret)
> -		tpm_do_selftest(chip);
> +	if (chip->flags & TPM_CHIP_FLAG_TPM2)
> +		tpm2_do_selftest(chip);
> +	else {
> +		ret = tpm_pm_resume(dev);
> +		if (!ret)
> +			tpm_do_selftest(chip);
> +	}
>  
>  	return ret;
>  }
> -- 
> 2.1.0
>