[tpmdd-devel,1/2] tpm: Factor out common startup code
diff mbox

Message ID 1466324401-5054-2-git-send-email-andrew.zamansky@nuvoton.com
State New
Headers show

Commit Message

andrew.zamansky@nuvoton.com June 19, 2016, 8:20 a.m. UTC
From: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>

The TCG standard startup sequence (get timeouts, tpm startup, etc) for
TPM and TPM2 chips is being open coded in many drivers, move it into
the core code.

tpm_tis and tpm_crb are used as the basis for the core code
implementation and the easy drivers are converted. In the process
several small drivers bugs relating to error handling this flow
are fixed.

For now the flag TPM_OPS_AUTO_STARTUP is optional to allow a staged
driver roll out, but ultimately all drivers should use this flow and
the flag removed. Some drivers still do not implement the startup
sequence at all and will need to be tested with it enabled.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Tested-by: Andrew Zamansky <andrew.zamansky@nuvoton.com>
---
 drivers/char/tpm/st33zp24/st33zp24.c |  4 +---
 drivers/char/tpm/tpm-chip.c          | 15 ++++++++++++++
 drivers/char/tpm/tpm-interface.c     | 27 ++++++++++++++++++++++++
 drivers/char/tpm/tpm.h               |  2 ++
 drivers/char/tpm/tpm2-cmd.c          | 40 ++++++++++++++++++++++++++++++++++++
 drivers/char/tpm/tpm_crb.c           | 10 +--------
 drivers/char/tpm/tpm_i2c_atmel.c     |  6 +-----
 drivers/char/tpm/tpm_i2c_infineon.c  |  4 +---
 drivers/char/tpm/tpm_i2c_nuvoton.c   |  7 +------
 drivers/char/tpm/tpm_tis.c           | 24 +---------------------
 include/linux/tpm.h                  |  6 ++++++
 11 files changed, 96 insertions(+), 49 deletions(-)

Comments

Jarkko Sakkinen June 19, 2016, 12:39 p.m. UTC | #1
On Sun, Jun 19, 2016 at 11:20:00AM +0300, andrew zamansky wrote:
> From: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
> 
> The TCG standard startup sequence (get timeouts, tpm startup, etc) for
> TPM and TPM2 chips is being open coded in many drivers, move it into
> the core code.
> 
> tpm_tis and tpm_crb are used as the basis for the core code
> implementation and the easy drivers are converted. In the process
> several small drivers bugs relating to error handling this flow
> are fixed.
> 
> For now the flag TPM_OPS_AUTO_STARTUP is optional to allow a staged
> driver roll out, but ultimately all drivers should use this flow and
> the flag removed. Some drivers still do not implement the startup
> sequence at all and will need to be tested with it enabled.
> 
> Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
> Tested-by: Andrew Zamansky <andrew.zamansky@nuvoton.com>

Couldn't tpm?_auto_startup() be static functions inside tpm-chip.c?

> ---
>  drivers/char/tpm/st33zp24/st33zp24.c |  4 +---
>  drivers/char/tpm/tpm-chip.c          | 15 ++++++++++++++
>  drivers/char/tpm/tpm-interface.c     | 27 ++++++++++++++++++++++++
>  drivers/char/tpm/tpm.h               |  2 ++
>  drivers/char/tpm/tpm2-cmd.c          | 40 ++++++++++++++++++++++++++++++++++++
>  drivers/char/tpm/tpm_crb.c           | 10 +--------
>  drivers/char/tpm/tpm_i2c_atmel.c     |  6 +-----
>  drivers/char/tpm/tpm_i2c_infineon.c  |  4 +---
>  drivers/char/tpm/tpm_i2c_nuvoton.c   |  7 +------
>  drivers/char/tpm/tpm_tis.c           | 24 +---------------------
>  include/linux/tpm.h                  |  6 ++++++
>  11 files changed, 96 insertions(+), 49 deletions(-)
> 
> diff --git a/drivers/char/tpm/st33zp24/st33zp24.c b/drivers/char/tpm/st33zp24/st33zp24.c
> index 8d62678..4556c95 100644
> --- a/drivers/char/tpm/st33zp24/st33zp24.c
> +++ b/drivers/char/tpm/st33zp24/st33zp24.c
> @@ -532,6 +532,7 @@ static bool st33zp24_req_canceled(struct tpm_chip *chip, u8 status)
>  }
>  
>  static const struct tpm_class_ops st33zp24_tpm = {
> +	.flags = TPM_OPS_AUTO_STARTUP,
>  	.send = st33zp24_send,
>  	.recv = st33zp24_recv,
>  	.cancel = st33zp24_cancel,
> @@ -618,9 +619,6 @@ int st33zp24_probe(void *phy_id, const struct st33zp24_phy_ops *ops,
>  		tpm_gen_interrupt(chip);
>  	}
>  
> -	tpm_get_timeouts(chip);
> -	tpm_do_selftest(chip);
> -
>  	return tpm_chip_register(chip);
>  _tpm_clean_answer:
>  	dev_info(&chip->dev, "TPM initialization fail\n");
> diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
> index 274dd01..9a36ced 100644
> --- a/drivers/char/tpm/tpm-chip.c
> +++ b/drivers/char/tpm/tpm-chip.c
> @@ -223,6 +223,21 @@ int tpm_chip_register(struct tpm_chip *chip)
>  {
>  	int rc;
>  
> +	if (chip->ops->flags & TPM_OPS_PROBE_TPM2) {
> +		rc = tpm2_probe(chip);
> +		if (rc)
> +			return rc;
> +	}
> +
> +	if (chip->ops->flags & TPM_OPS_AUTO_STARTUP) {
> +		if (chip->flags & TPM_CHIP_FLAG_TPM2)
> +			rc = tpm2_auto_startup(chip);
> +		else
> +			rc = tpm1_auto_startup(chip);
> +		if (rc)
> +			return rc;
> +	}
> +
>  	rc = tpm1_chip_register(chip);
>  	if (rc)
>  		return rc;
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index e2fa89c..4e6798a 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -842,6 +842,33 @@ int tpm_do_selftest(struct tpm_chip *chip)
>  }
>  EXPORT_SYMBOL_GPL(tpm_do_selftest);
>  
> +/**
> + * tpm1_auto_startup - Perform the standard automatic TPM initialization
> + *                     sequence
> + * @chip: TPM chip to use
> + *
> + * Returns 0 on success, < 0 in case of fatal error.
> + */
> +int tpm1_auto_startup(struct tpm_chip *chip)
> +{
> +	int rc;
> +
> +	rc = tpm_get_timeouts(chip);
> +	if (rc)
> +		goto out;
> +	rc = tpm_do_selftest(chip);
> +	if (rc) {
> +		dev_err(&chip->dev, "TPM self test failed\n");
> +		goto out;
> +	}
> +
> +	return rc;
> +out:
> +	if (rc > 0)
> +		rc = -ENODEV;
> +	return rc;
> +}
> +
>  int tpm_send(u32 chip_num, void *cmd, size_t buflen)
>  {
>  	struct tpm_chip *chip;
> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
> index 28b477e..a99105f 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -501,6 +501,7 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, void *cmd, int len,
>  			 const char *desc);
>  extern int tpm_get_timeouts(struct tpm_chip *);
>  extern void tpm_gen_interrupt(struct tpm_chip *);
> +int tpm1_auto_startup(struct tpm_chip *chip);
>  extern int tpm_do_selftest(struct tpm_chip *);
>  extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
>  extern int tpm_pm_suspend(struct device *);
> @@ -539,6 +540,7 @@ int tpm2_unseal_trusted(struct tpm_chip *chip,
>  ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id,
>  			u32 *value, const char *desc);
>  
> +int tpm2_auto_startup(struct tpm_chip *chip);
>  extern int tpm2_startup(struct tpm_chip *chip, u16 startup_type);
>  extern void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
>  extern unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *, u32);
> diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
> index b28e4da..984190e 100644
> --- a/drivers/char/tpm/tpm2-cmd.c
> +++ b/drivers/char/tpm/tpm2-cmd.c
> @@ -943,3 +943,43 @@ int tpm2_probe(struct tpm_chip *chip)
>  	return 0;
>  }
>  EXPORT_SYMBOL_GPL(tpm2_probe);
> +
> +/**
> + * tpm2_auto_startup - Perform the standard automatic TPM initialization
> + *                     sequence
> + * @chip: TPM chip to use
> + *
> + * Returns 0 on success, < 0 in case of fatal error.
> + */
> +int tpm2_auto_startup(struct tpm_chip *chip)
> +{
> +	int rc;
> +
> +	rc = tpm_get_timeouts(chip);
> +	if (rc)
> +		goto out;
> +
> +	rc = tpm2_do_selftest(chip);
> +	if (rc != TPM2_RC_INITIALIZE) {
> +		dev_err(&chip->dev, "TPM self test failed\n");
> +		goto out;
> +	}
> +
> +	if (rc == TPM2_RC_INITIALIZE) {
> +		rc = tpm2_startup(chip, TPM2_SU_CLEAR);
> +		if (rc)
> +			goto out;
> +
> +		rc = tpm2_do_selftest(chip);
> +		if (rc) {
> +			dev_err(&chip->dev, "TPM self test failed\n");
> +			goto out;
> +		}
> +	}
> +
> +	return rc;
> +out:
> +	if (rc > 0)
> +		rc = -ENODEV;
> +	return rc;
> +}
> diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
> index a12b319..80c4af0 100644
> --- a/drivers/char/tpm/tpm_crb.c
> +++ b/drivers/char/tpm/tpm_crb.c
> @@ -189,6 +189,7 @@ static bool crb_req_canceled(struct tpm_chip *chip, u8 status)
>  }
>  
>  static const struct tpm_class_ops tpm_crb = {
> +	.flags = TPM_OPS_AUTO_STARTUP,
>  	.status = crb_status,
>  	.recv = crb_recv,
>  	.send = crb_send,
> @@ -201,7 +202,6 @@ static const struct tpm_class_ops tpm_crb = {
>  static int crb_init(struct acpi_device *device, struct crb_priv *priv)
>  {
>  	struct tpm_chip *chip;
> -	int rc;
>  
>  	chip = tpmm_chip_alloc(&device->dev, &tpm_crb);
>  	if (IS_ERR(chip))
> @@ -211,14 +211,6 @@ static int crb_init(struct acpi_device *device, struct crb_priv *priv)
>  	chip->acpi_dev_handle = device->handle;
>  	chip->flags = TPM_CHIP_FLAG_TPM2;
>  
> -	rc = tpm_get_timeouts(chip);
> -	if (rc)
> -		return rc;
> -
> -	rc = tpm2_do_selftest(chip);
> -	if (rc)
> -		return rc;
> -
>  	return tpm_chip_register(chip);
>  }
>  
> diff --git a/drivers/char/tpm/tpm_i2c_atmel.c b/drivers/char/tpm/tpm_i2c_atmel.c
> index 8dfb88b..6f7c73d 100644
> --- a/drivers/char/tpm/tpm_i2c_atmel.c
> +++ b/drivers/char/tpm/tpm_i2c_atmel.c
> @@ -141,6 +141,7 @@ static bool i2c_atmel_req_canceled(struct tpm_chip *chip, u8 status)
>  }
>  
>  static const struct tpm_class_ops i2c_atmel = {
> +	.flags = TPM_OPS_AUTO_STARTUP,
>  	.status = i2c_atmel_read_status,
>  	.recv = i2c_atmel_recv,
>  	.send = i2c_atmel_send,
> @@ -178,11 +179,6 @@ static int i2c_atmel_probe(struct i2c_client *client,
>  	/* There is no known way to probe for this device, and all version
>  	 * information seems to be read via TPM commands. Thus we rely on the
>  	 * TPM startup process in the common code to detect the device. */
> -	if (tpm_get_timeouts(chip))
> -		return -ENODEV;
> -
> -	if (tpm_do_selftest(chip))
> -		return -ENODEV;
>  
>  	return tpm_chip_register(chip);
>  }
> diff --git a/drivers/char/tpm/tpm_i2c_infineon.c b/drivers/char/tpm/tpm_i2c_infineon.c
> index 63d5d22..e08633e 100644
> --- a/drivers/char/tpm/tpm_i2c_infineon.c
> +++ b/drivers/char/tpm/tpm_i2c_infineon.c
> @@ -566,6 +566,7 @@ static bool tpm_tis_i2c_req_canceled(struct tpm_chip *chip, u8 status)
>  }
>  
>  static const struct tpm_class_ops tpm_tis_i2c = {
> +	.flags = TPM_OPS_AUTO_STARTUP,
>  	.status = tpm_tis_i2c_status,
>  	.recv = tpm_tis_i2c_recv,
>  	.send = tpm_tis_i2c_send,
> @@ -622,9 +623,6 @@ static int tpm_tis_i2c_init(struct device *dev)
>  	INIT_LIST_HEAD(&chip->vendor.list);
>  	tpm_dev.chip = chip;
>  
> -	tpm_get_timeouts(chip);
> -	tpm_do_selftest(chip);
> -
>  	return tpm_chip_register(chip);
>  out_release:
>  	release_locality(chip, chip->vendor.locality, 1);
> diff --git a/drivers/char/tpm/tpm_i2c_nuvoton.c b/drivers/char/tpm/tpm_i2c_nuvoton.c
> index 847f159..b64effc 100644
> --- a/drivers/char/tpm/tpm_i2c_nuvoton.c
> +++ b/drivers/char/tpm/tpm_i2c_nuvoton.c
> @@ -456,6 +456,7 @@ static bool i2c_nuvoton_req_canceled(struct tpm_chip *chip, u8 status)
>  }
>  
>  static const struct tpm_class_ops tpm_i2c = {
> +	.flags = TPM_OPS_AUTO_STARTUP,
>  	.status = i2c_nuvoton_read_status,
>  	.recv = i2c_nuvoton_recv,
>  	.send = i2c_nuvoton_send,
> @@ -601,12 +602,6 @@ static int i2c_nuvoton_probe(struct i2c_client *client,
>  		}
>  	}
>  
> -	if (tpm_get_timeouts(chip))
> -		return -ENODEV;
> -
> -	if (tpm_do_selftest(chip))
> -		return -ENODEV;
> -
>  	return tpm_chip_register(chip);
>  }
>  
> diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
> index a507006..30aff5b 100644
> --- a/drivers/char/tpm/tpm_tis.c
> +++ b/drivers/char/tpm/tpm_tis.c
> @@ -524,6 +524,7 @@ static bool tpm_tis_req_canceled(struct tpm_chip *chip, u8 status)
>  }
>  
>  static const struct tpm_class_ops tpm_tis = {
> +	.flags = TPM_OPS_AUTO_STARTUP,
>  	.status = tpm_tis_status,
>  	.recv = tpm_tis_recv,
>  	.send = tpm_tis_send,
> @@ -785,29 +786,6 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
>  			tpm_tis_probe_irq(chip, intmask);
>  	}
>  
> -	if (chip->flags & TPM_CHIP_FLAG_TPM2) {
> -		rc = tpm2_do_selftest(chip);
> -		if (rc == TPM2_RC_INITIALIZE) {
> -			dev_warn(dev, "Firmware has not started TPM\n");
> -			rc  = tpm2_startup(chip, TPM2_SU_CLEAR);
> -			if (!rc)
> -				rc = tpm2_do_selftest(chip);
> -		}
> -
> -		if (rc) {
> -			dev_err(dev, "TPM self test failed\n");
> -			if (rc > 0)
> -				rc = -ENODEV;
> -			goto out_err;
> -		}
> -	} else {
> -		if (tpm_do_selftest(chip)) {
> -			dev_err(dev, "TPM self test failed\n");
> -			rc = -ENODEV;
> -			goto out_err;
> -		}
> -	}
> -
>  	return tpm_chip_register(chip);
>  out_err:
>  	tpm_tis_remove(chip);
> diff --git a/include/linux/tpm.h b/include/linux/tpm.h
> index 706e63e..0115470 100644
> --- a/include/linux/tpm.h
> +++ b/include/linux/tpm.h
> @@ -33,7 +33,13 @@ struct tpm_chip;
>  struct trusted_key_payload;
>  struct trusted_key_options;
>  
> +enum TPM_OPS_FLAGS {
> +	TPM_OPS_PROBE_TPM2 = BIT(0),

I see two alternatives here:

1. Make this work for tpm_tis.c if it is doable.
2. Remove this flag and call tpm2_probe() inside tpm_i2c_nuvoton.c.

If this flag works only for a single driver, it does not bring any value.

/Jarkko

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Jason Gunthorpe June 20, 2016, 9:07 p.m. UTC | #2
On Sun, Jun 19, 2016 at 02:39:24PM +0200, Jarkko Sakkinen wrote:
> > Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
> > Tested-by: Andrew Zamansky <andrew.zamansky@nuvoton.com>
> 
> Couldn't tpm?_auto_startup() be static functions inside tpm-chip.c?

Why? tpm-chip is for chip functions and tpm-interface is for command
issuing functions, the startup command sequencors seem appropriately
placed...

These are still module private functions.

> > +enum TPM_OPS_FLAGS {
> > +	TPM_OPS_PROBE_TPM2 = BIT(0),
> 
> I see two alternatives here:
> 
> 1. Make this work for tpm_tis.c if it is doable.
> 2. Remove this flag and call tpm2_probe() inside tpm_i2c_nuvoton.c.
> 
> If this flag works only for a single driver, it does not bring any value.

We already have two drivers that auto probe, you don't think there
will be more? The idea is to try and remove these low level entry
points so drivers are simpler.

TIS doesn't use it because it needs to get things setup in advance for
interrupt auto-probing, which is a very TIS unique thing.

Alternatively we can drop the auto-probe from nuvoton and force it to
rely on compatible string matching to enter TPM2 mode.

Jason

------------------------------------------------------------------------------
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patterns at an interface-level. Reveals which users, apps, and protocols are 
consuming the most bandwidth. Provides multi-vendor support for NetFlow, 
J-Flow, sFlow and other flows. Make informed decisions using capacity planning
reports. http://sdm.link/zohomanageengine
Jarkko Sakkinen June 22, 2016, 12:22 p.m. UTC | #3
On Mon, Jun 20, 2016 at 03:07:57PM -0600, Jason Gunthorpe wrote:
> On Sun, Jun 19, 2016 at 02:39:24PM +0200, Jarkko Sakkinen wrote:
> > > Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
> > > Tested-by: Andrew Zamansky <andrew.zamansky@nuvoton.com>
> > 
> > Couldn't tpm?_auto_startup() be static functions inside tpm-chip.c?
> 
> Why? tpm-chip is for chip functions and tpm-interface is for command
> issuing functions, the startup command sequencors seem appropriately
> placed...
> 
> These are still module private functions.

Hmm.. interesting point and I actually realized that this related to
work that I'm doing right now.

I'm working on a patches to move TPM 1.x protocol level code to
tpm1-cmd.c. We want to do so that one can conditionally compile out TPM
1.x when it is not needed. Another reason is that, I would not like to
put TPM 1.x sealing code to tpm-interface.c.

Given that I think it is cool to keep these in tpm-interface.c in this
in tpm-interface.c.

Summary: lets keep it in a way that these functions are in
tpm-interface.c for now.

> > > +enum TPM_OPS_FLAGS {
> > > +	TPM_OPS_PROBE_TPM2 = BIT(0),
> > 
> > I see two alternatives here:
> > 
> > 1. Make this work for tpm_tis.c if it is doable.
> > 2. Remove this flag and call tpm2_probe() inside tpm_i2c_nuvoton.c.
> > 
> > If this flag works only for a single driver, it does not bring any value.
> 
> We already have two drivers that auto probe, you don't think there
> will be more? The idea is to try and remove these low level entry
> points so drivers are simpler.
> 
> TIS doesn't use it because it needs to get things setup in advance for
> interrupt auto-probing, which is a very TIS unique thing.
> 
> Alternatively we can drop the auto-probe from nuvoton and force it to
> rely on compatible string matching to enter TPM2 mode.

The patch set used TPM2_OPS_PROBE_TPM2 only for nuvoton driver. The more
recent one used it incorrectly with tpm_tis.

> Jason

PS. Would you have time to look at https://lkml.org/lkml/2016/6/17/887
and give your feedback? :)

/Jarkko

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Jason Gunthorpe June 22, 2016, 9:37 p.m. UTC | #4
On Wed, Jun 22, 2016 at 03:22:28PM +0300, Jarkko Sakkinen wrote:

> PS. Would you have time to look at https://lkml.org/lkml/2016/6/17/887
> and give your feedback? :)

Looks reasonable to me.

Jason

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Patch
diff mbox

diff --git a/drivers/char/tpm/st33zp24/st33zp24.c b/drivers/char/tpm/st33zp24/st33zp24.c
index 8d62678..4556c95 100644
--- a/drivers/char/tpm/st33zp24/st33zp24.c
+++ b/drivers/char/tpm/st33zp24/st33zp24.c
@@ -532,6 +532,7 @@  static bool st33zp24_req_canceled(struct tpm_chip *chip, u8 status)
 }
 
 static const struct tpm_class_ops st33zp24_tpm = {
+	.flags = TPM_OPS_AUTO_STARTUP,
 	.send = st33zp24_send,
 	.recv = st33zp24_recv,
 	.cancel = st33zp24_cancel,
@@ -618,9 +619,6 @@  int st33zp24_probe(void *phy_id, const struct st33zp24_phy_ops *ops,
 		tpm_gen_interrupt(chip);
 	}
 
-	tpm_get_timeouts(chip);
-	tpm_do_selftest(chip);
-
 	return tpm_chip_register(chip);
 _tpm_clean_answer:
 	dev_info(&chip->dev, "TPM initialization fail\n");
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index 274dd01..9a36ced 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -223,6 +223,21 @@  int tpm_chip_register(struct tpm_chip *chip)
 {
 	int rc;
 
+	if (chip->ops->flags & TPM_OPS_PROBE_TPM2) {
+		rc = tpm2_probe(chip);
+		if (rc)
+			return rc;
+	}
+
+	if (chip->ops->flags & TPM_OPS_AUTO_STARTUP) {
+		if (chip->flags & TPM_CHIP_FLAG_TPM2)
+			rc = tpm2_auto_startup(chip);
+		else
+			rc = tpm1_auto_startup(chip);
+		if (rc)
+			return rc;
+	}
+
 	rc = tpm1_chip_register(chip);
 	if (rc)
 		return rc;
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index e2fa89c..4e6798a 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -842,6 +842,33 @@  int tpm_do_selftest(struct tpm_chip *chip)
 }
 EXPORT_SYMBOL_GPL(tpm_do_selftest);
 
+/**
+ * tpm1_auto_startup - Perform the standard automatic TPM initialization
+ *                     sequence
+ * @chip: TPM chip to use
+ *
+ * Returns 0 on success, < 0 in case of fatal error.
+ */
+int tpm1_auto_startup(struct tpm_chip *chip)
+{
+	int rc;
+
+	rc = tpm_get_timeouts(chip);
+	if (rc)
+		goto out;
+	rc = tpm_do_selftest(chip);
+	if (rc) {
+		dev_err(&chip->dev, "TPM self test failed\n");
+		goto out;
+	}
+
+	return rc;
+out:
+	if (rc > 0)
+		rc = -ENODEV;
+	return rc;
+}
+
 int tpm_send(u32 chip_num, void *cmd, size_t buflen)
 {
 	struct tpm_chip *chip;
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 28b477e..a99105f 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -501,6 +501,7 @@  ssize_t tpm_transmit_cmd(struct tpm_chip *chip, void *cmd, int len,
 			 const char *desc);
 extern int tpm_get_timeouts(struct tpm_chip *);
 extern void tpm_gen_interrupt(struct tpm_chip *);
+int tpm1_auto_startup(struct tpm_chip *chip);
 extern int tpm_do_selftest(struct tpm_chip *);
 extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
 extern int tpm_pm_suspend(struct device *);
@@ -539,6 +540,7 @@  int tpm2_unseal_trusted(struct tpm_chip *chip,
 ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id,
 			u32 *value, const char *desc);
 
+int tpm2_auto_startup(struct tpm_chip *chip);
 extern int tpm2_startup(struct tpm_chip *chip, u16 startup_type);
 extern void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
 extern unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *, u32);
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index b28e4da..984190e 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -943,3 +943,43 @@  int tpm2_probe(struct tpm_chip *chip)
 	return 0;
 }
 EXPORT_SYMBOL_GPL(tpm2_probe);
+
+/**
+ * tpm2_auto_startup - Perform the standard automatic TPM initialization
+ *                     sequence
+ * @chip: TPM chip to use
+ *
+ * Returns 0 on success, < 0 in case of fatal error.
+ */
+int tpm2_auto_startup(struct tpm_chip *chip)
+{
+	int rc;
+
+	rc = tpm_get_timeouts(chip);
+	if (rc)
+		goto out;
+
+	rc = tpm2_do_selftest(chip);
+	if (rc != TPM2_RC_INITIALIZE) {
+		dev_err(&chip->dev, "TPM self test failed\n");
+		goto out;
+	}
+
+	if (rc == TPM2_RC_INITIALIZE) {
+		rc = tpm2_startup(chip, TPM2_SU_CLEAR);
+		if (rc)
+			goto out;
+
+		rc = tpm2_do_selftest(chip);
+		if (rc) {
+			dev_err(&chip->dev, "TPM self test failed\n");
+			goto out;
+		}
+	}
+
+	return rc;
+out:
+	if (rc > 0)
+		rc = -ENODEV;
+	return rc;
+}
diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index a12b319..80c4af0 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -189,6 +189,7 @@  static bool crb_req_canceled(struct tpm_chip *chip, u8 status)
 }
 
 static const struct tpm_class_ops tpm_crb = {
+	.flags = TPM_OPS_AUTO_STARTUP,
 	.status = crb_status,
 	.recv = crb_recv,
 	.send = crb_send,
@@ -201,7 +202,6 @@  static const struct tpm_class_ops tpm_crb = {
 static int crb_init(struct acpi_device *device, struct crb_priv *priv)
 {
 	struct tpm_chip *chip;
-	int rc;
 
 	chip = tpmm_chip_alloc(&device->dev, &tpm_crb);
 	if (IS_ERR(chip))
@@ -211,14 +211,6 @@  static int crb_init(struct acpi_device *device, struct crb_priv *priv)
 	chip->acpi_dev_handle = device->handle;
 	chip->flags = TPM_CHIP_FLAG_TPM2;
 
-	rc = tpm_get_timeouts(chip);
-	if (rc)
-		return rc;
-
-	rc = tpm2_do_selftest(chip);
-	if (rc)
-		return rc;
-
 	return tpm_chip_register(chip);
 }
 
diff --git a/drivers/char/tpm/tpm_i2c_atmel.c b/drivers/char/tpm/tpm_i2c_atmel.c
index 8dfb88b..6f7c73d 100644
--- a/drivers/char/tpm/tpm_i2c_atmel.c
+++ b/drivers/char/tpm/tpm_i2c_atmel.c
@@ -141,6 +141,7 @@  static bool i2c_atmel_req_canceled(struct tpm_chip *chip, u8 status)
 }
 
 static const struct tpm_class_ops i2c_atmel = {
+	.flags = TPM_OPS_AUTO_STARTUP,
 	.status = i2c_atmel_read_status,
 	.recv = i2c_atmel_recv,
 	.send = i2c_atmel_send,
@@ -178,11 +179,6 @@  static int i2c_atmel_probe(struct i2c_client *client,
 	/* There is no known way to probe for this device, and all version
 	 * information seems to be read via TPM commands. Thus we rely on the
 	 * TPM startup process in the common code to detect the device. */
-	if (tpm_get_timeouts(chip))
-		return -ENODEV;
-
-	if (tpm_do_selftest(chip))
-		return -ENODEV;
 
 	return tpm_chip_register(chip);
 }
diff --git a/drivers/char/tpm/tpm_i2c_infineon.c b/drivers/char/tpm/tpm_i2c_infineon.c
index 63d5d22..e08633e 100644
--- a/drivers/char/tpm/tpm_i2c_infineon.c
+++ b/drivers/char/tpm/tpm_i2c_infineon.c
@@ -566,6 +566,7 @@  static bool tpm_tis_i2c_req_canceled(struct tpm_chip *chip, u8 status)
 }
 
 static const struct tpm_class_ops tpm_tis_i2c = {
+	.flags = TPM_OPS_AUTO_STARTUP,
 	.status = tpm_tis_i2c_status,
 	.recv = tpm_tis_i2c_recv,
 	.send = tpm_tis_i2c_send,
@@ -622,9 +623,6 @@  static int tpm_tis_i2c_init(struct device *dev)
 	INIT_LIST_HEAD(&chip->vendor.list);
 	tpm_dev.chip = chip;
 
-	tpm_get_timeouts(chip);
-	tpm_do_selftest(chip);
-
 	return tpm_chip_register(chip);
 out_release:
 	release_locality(chip, chip->vendor.locality, 1);
diff --git a/drivers/char/tpm/tpm_i2c_nuvoton.c b/drivers/char/tpm/tpm_i2c_nuvoton.c
index 847f159..b64effc 100644
--- a/drivers/char/tpm/tpm_i2c_nuvoton.c
+++ b/drivers/char/tpm/tpm_i2c_nuvoton.c
@@ -456,6 +456,7 @@  static bool i2c_nuvoton_req_canceled(struct tpm_chip *chip, u8 status)
 }
 
 static const struct tpm_class_ops tpm_i2c = {
+	.flags = TPM_OPS_AUTO_STARTUP,
 	.status = i2c_nuvoton_read_status,
 	.recv = i2c_nuvoton_recv,
 	.send = i2c_nuvoton_send,
@@ -601,12 +602,6 @@  static int i2c_nuvoton_probe(struct i2c_client *client,
 		}
 	}
 
-	if (tpm_get_timeouts(chip))
-		return -ENODEV;
-
-	if (tpm_do_selftest(chip))
-		return -ENODEV;
-
 	return tpm_chip_register(chip);
 }
 
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index a507006..30aff5b 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -524,6 +524,7 @@  static bool tpm_tis_req_canceled(struct tpm_chip *chip, u8 status)
 }
 
 static const struct tpm_class_ops tpm_tis = {
+	.flags = TPM_OPS_AUTO_STARTUP,
 	.status = tpm_tis_status,
 	.recv = tpm_tis_recv,
 	.send = tpm_tis_send,
@@ -785,29 +786,6 @@  static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
 			tpm_tis_probe_irq(chip, intmask);
 	}
 
-	if (chip->flags & TPM_CHIP_FLAG_TPM2) {
-		rc = tpm2_do_selftest(chip);
-		if (rc == TPM2_RC_INITIALIZE) {
-			dev_warn(dev, "Firmware has not started TPM\n");
-			rc  = tpm2_startup(chip, TPM2_SU_CLEAR);
-			if (!rc)
-				rc = tpm2_do_selftest(chip);
-		}
-
-		if (rc) {
-			dev_err(dev, "TPM self test failed\n");
-			if (rc > 0)
-				rc = -ENODEV;
-			goto out_err;
-		}
-	} else {
-		if (tpm_do_selftest(chip)) {
-			dev_err(dev, "TPM self test failed\n");
-			rc = -ENODEV;
-			goto out_err;
-		}
-	}
-
 	return tpm_chip_register(chip);
 out_err:
 	tpm_tis_remove(chip);
diff --git a/include/linux/tpm.h b/include/linux/tpm.h
index 706e63e..0115470 100644
--- a/include/linux/tpm.h
+++ b/include/linux/tpm.h
@@ -33,7 +33,13 @@  struct tpm_chip;
 struct trusted_key_payload;
 struct trusted_key_options;
 
+enum TPM_OPS_FLAGS {
+	TPM_OPS_PROBE_TPM2 = BIT(0),
+	TPM_OPS_AUTO_STARTUP = BIT(1),
+};
+
 struct tpm_class_ops {
+	unsigned int flags;
 	const u8 req_complete_mask;
 	const u8 req_complete_val;
 	bool (*req_canceled)(struct tpm_chip *chip, u8 status);