Re: [PATCH v4 04/12] tpm_tis: Introduce intermediate layer for TPM access

[Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>]

On Tue, Apr 19, 2016 at 12:17:36AM +0200, Christophe Ricard wrote:
> This splits tpm_tis in a high-level protocol part and a low-level interface
> for the actual TPM communication. The low-level interface can then be
> implemented by additional drivers to provide access to TPMs using other
> mechanisms, for example native I2C or SPI transfers, while still reusing
> the same TIS protocol implementation.

I do not see anything obviously wrong in this patch except the use
of tpm_mem prefix. Earlier you used LPC which was incorrect. Now you
refer to the same entity with this tpm_mem prefix.

Maybe tpm_tcg would be the right choice in both cases...

/Jarkko

> Signed-off-by: Alexander Steffen <Alexander.Steffen-d0qZbvYSIPpWk0Htik3J/w@public.gmane.org>
> Signed-off-by: Christophe Ricard <christophe-h.ricard-qxv4g6HH51o@public.gmane.org>
> ---
>  drivers/char/tpm/tpm_tis.c      | 201 +++++++++++++++++++++-------------------
>  drivers/char/tpm/tpm_tis_core.h |  64 +++++++++++++
>  2 files changed, 168 insertions(+), 97 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
> index af53747..6df7ddc 100644
> --- a/drivers/char/tpm/tpm_tis.c
> +++ b/drivers/char/tpm/tpm_tis.c
> @@ -131,11 +131,9 @@ static inline int is_itpm(struct acpi_device *dev)
>   * correct values in the other bits.' */
>  static int wait_startup(struct tpm_chip *chip, int l)
>  {
> -	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> -	struct tpm_tis_lpc_phy *phy = to_tpm_tis_lpc_phy(priv);
>  	unsigned long stop = jiffies + chip->timeout_a;
>  	do {
> -		if (ioread8(phy->iobase + TPM_ACCESS(l)) &
> +		if (tpm_read8(chip, TPM_ACCESS(l)) &
>  		    TPM_ACCESS_VALID)
>  			return 0;
>  		msleep(TPM_TIMEOUT);
> @@ -146,9 +144,8 @@ static int wait_startup(struct tpm_chip *chip, int l)
>  static int check_locality(struct tpm_chip *chip, int l)
>  {
>  	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> -	struct tpm_tis_lpc_phy *phy = to_tpm_tis_lpc_phy(priv);
>  
> -	if ((ioread8(phy->iobase + TPM_ACCESS(l)) &
> +	if ((tpm_read8(chip, TPM_ACCESS(l)) &
>  	     (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
>  	    (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
>  		return priv->locality = l;
> @@ -158,28 +155,23 @@ static int check_locality(struct tpm_chip *chip, int l)
>  
>  static void release_locality(struct tpm_chip *chip, int l, int force)
>  {
> -	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> -	struct tpm_tis_lpc_phy *phy = to_tpm_tis_lpc_phy(priv);
> -
> -	if (force || (ioread8(phy->iobase + TPM_ACCESS(l)) &
> +	if (force || (tpm_read8(chip, TPM_ACCESS(l)) &
>  		      (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) ==
>  	    (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID))
> -		iowrite8(TPM_ACCESS_ACTIVE_LOCALITY,
> -			 phy->iobase + TPM_ACCESS(l));
> +		tpm_write8(chip, TPM_ACCESS(l), TPM_ACCESS_ACTIVE_LOCALITY);
> +
>  }
>  
>  static int request_locality(struct tpm_chip *chip, int l)
>  {
>  	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> -	struct tpm_tis_lpc_phy *phy = to_tpm_tis_lpc_phy(priv);
>  	unsigned long stop, timeout;
>  	long rc;
>  
>  	if (check_locality(chip, l) >= 0)
>  		return l;
>  
> -	iowrite8(TPM_ACCESS_REQUEST_USE,
> -		 phy->iobase + TPM_ACCESS(l));
> +	tpm_write8(chip, TPM_ACCESS(l), TPM_ACCESS_REQUEST_USE);
>  
>  	stop = jiffies + chip->timeout_a;
>  
> @@ -213,26 +205,21 @@ again:
>  static u8 tpm_tis_status(struct tpm_chip *chip)
>  {
>  	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> -	struct tpm_tis_lpc_phy *phy = to_tpm_tis_lpc_phy(priv);
>  
> -	return ioread8(phy->iobase +
> -		       TPM_STS(priv->locality));
> +	return tpm_read8(chip, TPM_STS(priv->locality));
>  }
>  
>  static void tpm_tis_ready(struct tpm_chip *chip)
>  {
>  	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> -	struct tpm_tis_lpc_phy *phy = to_tpm_tis_lpc_phy(priv);
>  
>  	/* this causes the current command to be aborted */
> -	iowrite8(TPM_STS_COMMAND_READY,
> -		 phy->iobase + TPM_STS(priv->locality));
> +	tpm_write8(chip, TPM_STS(priv->locality), TPM_STS_COMMAND_READY);
>  }
>  
>  static int get_burstcount(struct tpm_chip *chip)
>  {
>  	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> -	struct tpm_tis_lpc_phy *phy = to_tpm_tis_lpc_phy(priv);
>  	unsigned long stop;
>  	int burstcnt;
>  
> @@ -240,11 +227,8 @@ static int get_burstcount(struct tpm_chip *chip)
>  	/* which timeout value, spec has 2 answers (c & d) */
>  	stop = jiffies + chip->timeout_d;
>  	do {
> -		burstcnt = ioread8(phy->iobase +
> -				   TPM_STS(priv->locality) + 1);
> -		burstcnt += ioread8(phy->iobase +
> -				    TPM_STS(priv->locality) +
> -				    2) << 8;
> +		burstcnt = tpm_read8(chip, TPM_STS(priv->locality) + 1);
> +		burstcnt += tpm_read8(chip, TPM_STS(priv->locality) + 2) << 8;
>  		if (burstcnt)
>  			return burstcnt;
>  		msleep(TPM_TIMEOUT);
> @@ -255,18 +239,16 @@ static int get_burstcount(struct tpm_chip *chip)
>  static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
>  {
>  	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> -	struct tpm_tis_lpc_phy *phy = to_tpm_tis_lpc_phy(priv);
>  	int size = 0, burstcnt;
>  	while (size < count &&
>  	       wait_for_tpm_stat(chip,
>  				 TPM_STS_DATA_AVAIL | TPM_STS_VALID,
>  				 chip->timeout_c,
> -				 &priv->read_queue, true)
> -	       == 0) {
> -		burstcnt = get_burstcount(chip);
> -		for (; burstcnt > 0 && size < count; burstcnt--)
> -			buf[size++] = ioread8(phy->iobase +
> -					      TPM_DATA_FIFO(priv->locality));
> +				 &priv->read_queue, true) == 0) {
> +		burstcnt = min_t(int, get_burstcount(chip), count - size);
> +		tpm_read_bytes(chip, TPM_DATA_FIFO(priv->locality),
> +			       burstcnt, buf + size);
> +		size += burstcnt;
>  	}
>  	return size;
>  }
> @@ -330,7 +312,6 @@ MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)");
>  static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
>  {
>  	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> -	struct tpm_tis_lpc_phy *phy = to_tpm_tis_lpc_phy(priv);
>  	int rc, status, burstcnt;
>  	size_t count = 0;
>  
> @@ -349,12 +330,10 @@ static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
>  	}
>  
>  	while (count < len - 1) {
> -		burstcnt = get_burstcount(chip);
> -		for (; burstcnt > 0 && count < len - 1; burstcnt--) {
> -			iowrite8(buf[count], phy->iobase +
> -				 TPM_DATA_FIFO(priv->locality));
> -			count++;
> -		}
> +		burstcnt = min_t(int, get_burstcount(chip), len - count - 1);
> +		tpm_write_bytes(chip, TPM_DATA_FIFO(priv->locality),
> +				burstcnt, buf + count);
> +		count += burstcnt;
>  
>  		wait_for_tpm_stat(chip, TPM_STS_VALID, chip->timeout_c,
>  				  &priv->int_queue, false);
> @@ -366,8 +345,8 @@ static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
>  	}
>  
>  	/* write last byte */
> -	iowrite8(buf[count],
> -		 phy->iobase + TPM_DATA_FIFO(priv->locality));
> +	tpm_write8(chip, TPM_DATA_FIFO(priv->locality), buf[count]);
> +
>  	wait_for_tpm_stat(chip, TPM_STS_VALID, chip->timeout_c,
>  			  &priv->int_queue, false);
>  	status = tpm_tis_status(chip);
> @@ -387,15 +366,12 @@ out_err:
>  static void disable_interrupts(struct tpm_chip *chip)
>  {
>  	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> -	struct tpm_tis_lpc_phy *phy = to_tpm_tis_lpc_phy(priv);
>  	u32 intmask;
>  
> -	intmask =
> -	    ioread32(phy->iobase +
> -		     TPM_INT_ENABLE(priv->locality));
> +	intmask = tpm_read32(chip, TPM_INT_ENABLE(priv->locality));
>  	intmask &= ~TPM_GLOBAL_INT_ENABLE;
> -	iowrite32(intmask,
> -		  phy->iobase + TPM_INT_ENABLE(priv->locality));
> +	tpm_write32(chip, TPM_INT_ENABLE(priv->locality), intmask);
> +
>  	devm_free_irq(&chip->dev, priv->irq, chip);
>  	priv->irq = 0;
>  	chip->flags &= ~TPM_CHIP_FLAG_IRQ;
> @@ -409,7 +385,6 @@ static void disable_interrupts(struct tpm_chip *chip)
>  static int tpm_tis_send_main(struct tpm_chip *chip, u8 *buf, size_t len)
>  {
>  	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> -	struct tpm_tis_lpc_phy *phy = to_tpm_tis_lpc_phy(priv);
>  	int rc;
>  	u32 ordinal;
>  	unsigned long dur;
> @@ -419,8 +394,7 @@ static int tpm_tis_send_main(struct tpm_chip *chip, u8 *buf, size_t len)
>  		return rc;
>  
>  	/* go and do it */
> -	iowrite8(TPM_STS_GO,
> -		 phy->iobase + TPM_STS(priv->locality));
> +	tpm_write8(chip, TPM_STS(priv->locality), TPM_STS_GO);
>  
>  	if (chip->flags & TPM_CHIP_FLAG_IRQ) {
>  		ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
> @@ -481,12 +455,10 @@ static const struct tis_vendor_timeout_override vendor_timeout_overrides[] = {
>  static bool tpm_tis_update_timeouts(struct tpm_chip *chip,
>  				    unsigned long *timeout_cap)
>  {
> -	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> -	struct tpm_tis_lpc_phy *phy = to_tpm_tis_lpc_phy(priv);
>  	int i;
>  	u32 did_vid;
>  
> -	did_vid = ioread32(phy->iobase + TPM_DID_VID(0));
> +	did_vid = tpm_read32(chip, TPM_DID_VID(0));
>  
>  	for (i = 0; i != ARRAY_SIZE(vendor_timeout_overrides); i++) {
>  		if (vendor_timeout_overrides[i].did_vid != did_vid)
> @@ -507,7 +479,6 @@ static bool tpm_tis_update_timeouts(struct tpm_chip *chip,
>  static int probe_itpm(struct tpm_chip *chip)
>  {
>  	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> -	struct tpm_tis_lpc_phy *phy = to_tpm_tis_lpc_phy(priv);
>  	int rc = 0;
>  	u8 cmd_getticks[] = {
>  		0x00, 0xc1, 0x00, 0x00, 0x00, 0x0a,
> @@ -515,7 +486,7 @@ static int probe_itpm(struct tpm_chip *chip)
>  	};
>  	size_t len = sizeof(cmd_getticks);
>  	bool rem_itpm = itpm;
> -	u16 vendor = ioread16(phy->iobase + TPM_DID_VID(0));
> +	u16 vendor = tpm_read16(chip, TPM_DID_VID(0));
>  
>  	/* probe only iTPMS */
>  	if (vendor != TPM_VID_INTEL)
> @@ -573,16 +544,66 @@ static const struct tpm_class_ops tpm_tis = {
>  	.req_canceled = tpm_tis_req_canceled,
>  };
>  
> +static void tpm_mem_read_bytes(struct tpm_chip *chip, u32 addr, u16 len,
> +			       u8 *result)
> +{
> +	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> +	struct tpm_tis_lpc_phy *phy = to_tpm_tis_lpc_phy(priv);
> +
> +	while (len--)
> +		*result++ = ioread8(phy->iobase + addr);
> +}
> +
> +static void tpm_mem_write_bytes(struct tpm_chip *chip, u32 addr, u16 len,
> +				u8 *value)
> +{
> +	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> +	struct tpm_tis_lpc_phy *phy = to_tpm_tis_lpc_phy(priv);
> +
> +	while (len--)
> +		iowrite8(*value++, phy->iobase + addr);
> +}
> +
> +static u16 tpm_mem_read16(struct tpm_chip *chip, u32 addr)
> +{
> +	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> +	struct tpm_tis_lpc_phy *phy = to_tpm_tis_lpc_phy(priv);
> +
> +	return ioread16(phy->iobase + addr);
> +}
> +
> +static u32 tpm_mem_read32(struct tpm_chip *chip, u32 addr)
> +{
> +	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> +	struct tpm_tis_lpc_phy *phy = to_tpm_tis_lpc_phy(priv);
> +
> +	return ioread32(phy->iobase + addr);
> +}
> +
> +static void tpm_mem_write32(struct tpm_chip *chip, u32 addr, u32 value)
> +{
> +	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> +	struct tpm_tis_lpc_phy *phy = to_tpm_tis_lpc_phy(priv);
> +
> +	iowrite32(value, phy->iobase + addr);
> +}
> +
> +static const struct tpm_tis_phy_ops tpm_mem = {
> +	.read_bytes = tpm_mem_read_bytes,
> +	.write_bytes = tpm_mem_write_bytes,
> +	.read16 = tpm_mem_read16,
> +	.read32 = tpm_mem_read32,
> +	.write32 = tpm_mem_write32,
> +};
> +
>  static irqreturn_t tis_int_handler(int dummy, void *dev_id)
>  {
>  	struct tpm_chip *chip = dev_id;
>  	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> -	struct tpm_tis_lpc_phy *phy = to_tpm_tis_lpc_phy(priv);
>  	u32 interrupt;
>  	int i;
>  
> -	interrupt = ioread32(phy->iobase +
> -			     TPM_INT_STATUS(priv->locality));
> +	interrupt = tpm_read32(chip, TPM_INT_STATUS(priv->locality));
>  
>  	if (interrupt == 0)
>  		return IRQ_NONE;
> @@ -600,10 +621,8 @@ static irqreturn_t tis_int_handler(int dummy, void *dev_id)
>  		wake_up_interruptible(&priv->int_queue);
>  
>  	/* Clear interrupts handled with TPM_EOI */
> -	iowrite32(interrupt,
> -		  phy->iobase +
> -		  TPM_INT_STATUS(priv->locality));
> -	ioread32(phy->iobase + TPM_INT_STATUS(priv->locality));
> +	tpm_write32(chip, TPM_INT_STATUS(priv->locality), interrupt);
> +	tpm_read32(chip, TPM_INT_STATUS(priv->locality));
>  	return IRQ_HANDLED;
>  }
>  
> @@ -615,7 +634,6 @@ static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask,
>  				    int flags, int irq)
>  {
>  	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> -	struct tpm_tis_lpc_phy *phy = to_tpm_tis_lpc_phy(priv);
>  	u8 original_int_vec;
>  
>  	if (devm_request_irq(&chip->dev, irq, tis_int_handler, flags,
> @@ -626,19 +644,16 @@ static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask,
>  	}
>  	priv->irq = irq;
>  
> -	original_int_vec = ioread8(phy->iobase +
> -				   TPM_INT_VECTOR(priv->locality));
> -	iowrite8(irq,
> -		 phy->iobase + TPM_INT_VECTOR(priv->locality));
> +	original_int_vec = tpm_read8(chip, TPM_INT_VECTOR(priv->locality));
> +	tpm_write8(chip, TPM_INT_VECTOR(priv->locality), irq);
>  
>  	/* Clear all existing */
> -	iowrite32(ioread32(phy->iobase +
> -			   TPM_INT_STATUS(priv->locality)),
> -		  phy->iobase + TPM_INT_STATUS(priv->locality));
> +	tpm_write32(chip, TPM_INT_STATUS(priv->locality),
> +		    tpm_read32(chip, TPM_INT_STATUS(priv->locality)));
>  
>  	/* Turn on */
> -	iowrite32(intmask | TPM_GLOBAL_INT_ENABLE,
> -		  phy->iobase + TPM_INT_ENABLE(priv->locality));
> +	tpm_write32(chip, TPM_INT_ENABLE(priv->locality),
> +		    intmask | TPM_GLOBAL_INT_ENABLE);
>  
>  	priv->irq_tested = false;
>  
> @@ -654,8 +669,9 @@ static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask,
>  	 * will call disable_irq which undoes all of the above.
>  	 */
>  	if (!(chip->flags & TPM_CHIP_FLAG_IRQ)) {
> -		iowrite8(original_int_vec,
> -			 phy->iobase + TPM_INT_VECTOR(priv->locality));
> +		tpm_write8(chip, TPM_INT_VECTOR(priv->locality),
> +			   original_int_vec);
> +
>  		return 1;
>  	}
>  
> @@ -669,12 +685,10 @@ static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask,
>  static void tpm_tis_probe_irq(struct tpm_chip *chip, u32 intmask)
>  {
>  	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> -	struct tpm_tis_lpc_phy *phy = to_tpm_tis_lpc_phy(priv);
>  	u8 original_int_vec;
>  	int i;
>  
> -	original_int_vec = ioread8(phy->iobase +
> -				   TPM_INT_VECTOR(priv->locality));
> +	original_int_vec = tpm_read8(chip, TPM_INT_VECTOR(priv->locality));
>  
>  	if (!original_int_vec) {
>  		if (IS_ENABLED(CONFIG_X86))
> @@ -694,10 +708,9 @@ MODULE_PARM_DESC(interrupts, "Enable interrupts");
>  static void tpm_tis_remove(struct tpm_chip *chip)
>  {
>  	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> -	struct tpm_tis_lpc_phy *phy = to_tpm_tis_lpc_phy(priv);
> -	void __iomem *reg = phy->iobase + TPM_INT_ENABLE(priv->locality);
> +	u32 reg = TPM_INT_ENABLE(priv->locality);
>  
> -	iowrite32(~TPM_GLOBAL_INT_ENABLE & ioread32(reg), reg);
> +	tpm_write32(chip, reg, ~TPM_GLOBAL_INT_ENABLE & tpm_read32(chip, reg));
>  	release_locality(chip, priv->locality, 1);
>  }
>  
> @@ -725,6 +738,8 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
>  	if (IS_ERR(phy->iobase))
>  		return PTR_ERR(phy->iobase);
>  
> +	phy->priv.phy_ops = &tpm_mem;
> +
>  	/* Maximum timeouts */
>  	chip->timeout_a = TIS_TIMEOUT_A_MAX;
>  	chip->timeout_b = TIS_TIMEOUT_B_MAX;
> @@ -739,13 +754,11 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
>  	}
>  
>  	/* Take control of the TPM's interrupt hardware and shut it off */
> -	intmask = ioread32(phy->iobase +
> -			   TPM_INT_ENABLE(phy->priv.locality));
> +	intmask = tpm_read32(chip, TPM_INT_ENABLE(phy->priv.locality));
>  	intmask |= TPM_INTF_CMD_READY_INT | TPM_INTF_LOCALITY_CHANGE_INT |
>  		   TPM_INTF_DATA_AVAIL_INT | TPM_INTF_STS_VALID_INT;
>  	intmask &= ~TPM_GLOBAL_INT_ENABLE;
> -	iowrite32(intmask,
> -		  phy->iobase + TPM_INT_ENABLE(phy->priv.locality));
> +	tpm_write32(chip, TPM_INT_ENABLE(phy->priv.locality), intmask);
>  
>  	if (request_locality(chip, 0) != 0) {
>  		rc = -ENODEV;
> @@ -756,12 +769,12 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
>  	if (rc)
>  		goto out_err;
>  
> -	vendor = ioread32(phy->iobase + TPM_DID_VID(0));
> +	vendor = tpm_read32(chip, TPM_DID_VID(0));
>  	phy->priv.manufacturer_id = vendor;
>  
>  	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(phy->iobase + TPM_RID(0)));
> +		 vendor >> 16, tpm_read8(chip, TPM_RID(0)));
>  
>  	if (!itpm) {
>  		probe = probe_itpm(chip);
> @@ -777,9 +790,7 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
>  
>  
>  	/* Figure out the capabilities */
> -	intfcaps =
> -	    ioread32(phy->iobase +
> -		     TPM_INTF_CAPS(phy->priv.locality));
> +	intfcaps = tpm_read32(chip, TPM_INTF_CAPS(phy->priv.locality));
>  	dev_dbg(dev, "TPM interface capabilities (0x%x):\n",
>  		intfcaps);
>  	if (intfcaps & TPM_INTF_BURST_COUNT_STATIC)
> @@ -858,23 +869,19 @@ out_err:
>  static void tpm_tis_reenable_interrupts(struct tpm_chip *chip)
>  {
>  	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> -	struct tpm_tis_lpc_phy *phy = to_tpm_tis_lpc_phy(priv);
>  	u32 intmask;
>  
>  	/* reenable interrupts that device may have lost or
>  	   BIOS/firmware may have disabled */
> -	iowrite8(priv->irq, phy->iobase +
> -		 TPM_INT_VECTOR(priv->locality));
> +	tpm_write8(chip, TPM_INT_VECTOR(priv->locality), priv->irq);
>  
> -	intmask =
> -	    ioread32(phy->iobase + TPM_INT_ENABLE(priv->locality));
> +	intmask = tpm_read32(chip, TPM_INT_ENABLE(priv->locality));
>  
>  	intmask |= TPM_INTF_CMD_READY_INT
>  	    | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT
>  	    | TPM_INTF_STS_VALID_INT | TPM_GLOBAL_INT_ENABLE;
>  
> -	iowrite32(intmask,
> -		  phy->iobase + TPM_INT_ENABLE(priv->locality));
> +	tpm_write32(chip, TPM_INT_ENABLE(priv->locality), intmask);
>  }
>  
>  static int tpm_tis_resume(struct device *dev)
> diff --git a/drivers/char/tpm/tpm_tis_core.h b/drivers/char/tpm/tpm_tis_core.h
> index 2260f89..3e066eb 100644
> --- a/drivers/char/tpm/tpm_tis_core.h
> +++ b/drivers/char/tpm/tpm_tis_core.h
> @@ -25,6 +25,16 @@
>  
>  #include "tpm.h"
>  
> +struct tpm_tis_phy_ops {
> +	void (*read_bytes)(struct tpm_chip *chip, u32 addr, u16 len,
> +			   u8 *result);
> +	void (*write_bytes)(struct tpm_chip *chip, u32 addr, u16 len,
> +			    u8 *value);
> +	u16 (*read16)(struct tpm_chip *chip, u32 addr);
> +	u32 (*read32)(struct tpm_chip *chip, u32 addr);
> +	void (*write32)(struct tpm_chip *chip, u32 addr, u32 src);
> +};
> +
>  struct tpm_tis_data {
>  	u16 manufacturer_id;
>  	int locality;
> @@ -32,6 +42,60 @@ struct tpm_tis_data {
>  	bool irq_tested;
>  	wait_queue_head_t int_queue;
>  	wait_queue_head_t read_queue;
> +	const struct tpm_tis_phy_ops *phy_ops;
>  };
>  
> +static inline void tpm_read_bytes(struct tpm_chip *chip, u32 addr, u16 len,
> +				  u8 *result)
> +{
> +	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> +
> +	priv->phy_ops->read_bytes(chip, addr, len, result);
> +}
> +
> +static inline u8 tpm_read8(struct tpm_chip *chip, u32 addr)
> +{
> +	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> +	u8 result;
> +
> +	priv->phy_ops->read_bytes(chip, addr, 1, &result);
> +	return result;
> +}
> +
> +static inline u16 tpm_read16(struct tpm_chip *chip, u32 addr)
> +{
> +	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> +
> +	return priv->phy_ops->read16(chip, addr);
> +}
> +
> +static inline u32 tpm_read32(struct tpm_chip *chip, u32 addr)
> +{
> +	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> +
> +	return priv->phy_ops->read32(chip, addr);
> +}
> +
> +static inline void tpm_write_bytes(struct tpm_chip *chip, u32 addr, u16 len,
> +				   u8 *value)
> +{
> +	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> +
> +	priv->phy_ops->write_bytes(chip, addr, len, value);
> +}
> +
> +static inline void tpm_write8(struct tpm_chip *chip, u32 addr, u8 value)
> +{
> +	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> +
> +	priv->phy_ops->write_bytes(chip, addr, 1, &value);
> +}
> +
> +static inline void tpm_write32(struct tpm_chip *chip, u32 addr, u32 value)
> +{
> +	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
> +
> +	priv->phy_ops->write32(chip, addr, value);
> +}
> +
>  #endif
> -- 
> 2.1.4
> 

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