diff mbox

[PATCHv4,1/2] i2c: omap: re-factor omap_i2c_init function

Message ID 1351176199-6479-2-git-send-email-shubhrajyoti@ti.com (mailing list archive)
State New, archived
Headers show

Commit Message

Shubhrajyoti Datta Oct. 25, 2012, 2:43 p.m. UTC 
re-factor omap_i2c_init() so that we can re-use it for resume.
While at it also remove the bufstate variable as we write it
in omap_i2c_resize_fifo for every transfer.

Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>
---
v4: add spaces for readability

 drivers/i2c/busses/i2c-omap.c |   74 +++++++++++++++++++---------------------
 1 files changed, 35 insertions(+), 39 deletions(-)

Comments

Felipe Balbi Oct. 29, 2012, 7:50 p.m. UTC | #1 
On Thu, Oct 25, 2012 at 08:13:18PM +0530, Shubhrajyoti D wrote:
> re-factor omap_i2c_init() so that we can re-use it for resume.
> While at it also remove the bufstate variable as we write it
> in omap_i2c_resize_fifo for every transfer.
> 
> Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>

FWIW:

Reviewed-by: Felipe Balbi <balbi@ti.com>

(if I have time I will test this tomorrow and reply with a Tested-by)

> ---
> v4: add spaces for readability
> 
>  drivers/i2c/busses/i2c-omap.c |   74 +++++++++++++++++++---------------------
>  1 files changed, 35 insertions(+), 39 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
> index be329e9..38acf1a 100644
> --- a/drivers/i2c/busses/i2c-omap.c
> +++ b/drivers/i2c/busses/i2c-omap.c
> @@ -209,7 +209,6 @@ struct omap_i2c_dev {
>  	u16			pscstate;
>  	u16			scllstate;
>  	u16			sclhstate;
> -	u16			bufstate;
>  	u16			syscstate;
>  	u16			westate;
>  	u16			errata;
> @@ -285,9 +284,34 @@ static inline u16 omap_i2c_read_reg(struct omap_i2c_dev *i2c_dev, int reg)
>  	}
>  }
>  
> +static void __omap_i2c_init(struct omap_i2c_dev *dev)
> +{
> +
> +	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
> +
> +	/* Setup clock prescaler to obtain approx 12MHz I2C module clock: */
> +	omap_i2c_write_reg(dev, OMAP_I2C_PSC_REG, dev->pscstate);
> +
> +	/* SCL low and high time values */
> +	omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG, dev->scllstate);
> +	omap_i2c_write_reg(dev, OMAP_I2C_SCLH_REG, dev->sclhstate);
> +	if (dev->rev >= OMAP_I2C_REV_ON_3430_3530)
> +		omap_i2c_write_reg(dev, OMAP_I2C_WE_REG, dev->westate);
> +
> +	/* Take the I2C module out of reset: */
> +	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
> +
> +	/*
> +	 * Don't write to this register if the IE state is 0 as it can
> +	 * cause deadlock.
> +	 */
> +	if (dev->iestate)
> +		omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, dev->iestate);
> +}
> +
>  static int omap_i2c_init(struct omap_i2c_dev *dev)
>  {
> -	u16 psc = 0, scll = 0, sclh = 0, buf = 0;
> +	u16 psc = 0, scll = 0, sclh = 0;
>  	u16 fsscll = 0, fssclh = 0, hsscll = 0, hssclh = 0;
>  	unsigned long fclk_rate = 12000000;
>  	unsigned long timeout;
> @@ -337,11 +361,8 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
>  			 * REVISIT: Some wkup sources might not be needed.
>  			 */
>  			dev->westate = OMAP_I2C_WE_ALL;
> -			omap_i2c_write_reg(dev, OMAP_I2C_WE_REG,
> -							dev->westate);
>  		}
>  	}
> -	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
>  
>  	if (dev->flags & OMAP_I2C_FLAG_ALWAYS_ARMXOR_CLK) {
>  		/*
> @@ -426,28 +447,18 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
>  		sclh = fclk_rate / (dev->speed * 2) - 7 + psc;
>  	}
>  
> -	/* Setup clock prescaler to obtain approx 12MHz I2C module clock: */
> -	omap_i2c_write_reg(dev, OMAP_I2C_PSC_REG, psc);
> -
> -	/* SCL low and high time values */
> -	omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG, scll);
> -	omap_i2c_write_reg(dev, OMAP_I2C_SCLH_REG, sclh);
> -
> -	/* Take the I2C module out of reset: */
> -	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
> -
>  	/* Enable interrupts */
>  	dev->iestate = (OMAP_I2C_IE_XRDY | OMAP_I2C_IE_RRDY |
>  			OMAP_I2C_IE_NACK | OMAP_I2C_IE_AL)  |
>  			((dev->fifo_size) ? (OMAP_I2C_IE_RDR |
>  				OMAP_I2C_IE_XDR) : 0);
> -	omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, dev->iestate);
> -	if (dev->flags & OMAP_I2C_FLAG_RESET_REGS_POSTIDLE) {
> -		dev->pscstate = psc;
> -		dev->scllstate = scll;
> -		dev->sclhstate = sclh;
> -		dev->bufstate = buf;
> -	}
> +
> +	dev->pscstate = psc;
> +	dev->scllstate = scll;
> +	dev->sclhstate = sclh;
> +
> +	__omap_i2c_init(dev);
> +
>  	return 0;
>  }
>  
> @@ -1267,23 +1278,8 @@ static int omap_i2c_runtime_resume(struct device *dev)
>  {
>  	struct omap_i2c_dev *_dev = dev_get_drvdata(dev);
>  
> -	if (_dev->flags & OMAP_I2C_FLAG_RESET_REGS_POSTIDLE) {
> -		omap_i2c_write_reg(_dev, OMAP_I2C_CON_REG, 0);
> -		omap_i2c_write_reg(_dev, OMAP_I2C_PSC_REG, _dev->pscstate);
> -		omap_i2c_write_reg(_dev, OMAP_I2C_SCLL_REG, _dev->scllstate);
> -		omap_i2c_write_reg(_dev, OMAP_I2C_SCLH_REG, _dev->sclhstate);
> -		omap_i2c_write_reg(_dev, OMAP_I2C_BUF_REG, _dev->bufstate);
> -		omap_i2c_write_reg(_dev, OMAP_I2C_SYSC_REG, _dev->syscstate);
> -		omap_i2c_write_reg(_dev, OMAP_I2C_WE_REG, _dev->westate);
> -		omap_i2c_write_reg(_dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
> -	}
> -
> -	/*
> -	 * Don't write to this register if the IE state is 0 as it can
> -	 * cause deadlock.
> -	 */
> -	if (_dev->iestate)
> -		omap_i2c_write_reg(_dev, OMAP_I2C_IE_REG, _dev->iestate);
> +	if (_dev->flags & OMAP_I2C_FLAG_RESET_REGS_POSTIDLE)
> +		__omap_i2c_init(_dev);
>  
>  	return 0;
>  }
> -- 
> 1.7.5.4
> 
> --
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diff mbox

Patch

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index be329e9..38acf1a 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -209,7 +209,6 @@  struct omap_i2c_dev {
 	u16			pscstate;
 	u16			scllstate;
 	u16			sclhstate;
-	u16			bufstate;
 	u16			syscstate;
 	u16			westate;
 	u16			errata;
@@ -285,9 +284,34 @@  static inline u16 omap_i2c_read_reg(struct omap_i2c_dev *i2c_dev, int reg)
 	}
 }
 
+static void __omap_i2c_init(struct omap_i2c_dev *dev)
+{
+
+	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
+
+	/* Setup clock prescaler to obtain approx 12MHz I2C module clock: */
+	omap_i2c_write_reg(dev, OMAP_I2C_PSC_REG, dev->pscstate);
+
+	/* SCL low and high time values */
+	omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG, dev->scllstate);
+	omap_i2c_write_reg(dev, OMAP_I2C_SCLH_REG, dev->sclhstate);
+	if (dev->rev >= OMAP_I2C_REV_ON_3430_3530)
+		omap_i2c_write_reg(dev, OMAP_I2C_WE_REG, dev->westate);
+
+	/* Take the I2C module out of reset: */
+	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
+
+	/*
+	 * Don't write to this register if the IE state is 0 as it can
+	 * cause deadlock.
+	 */
+	if (dev->iestate)
+		omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, dev->iestate);
+}
+
 static int omap_i2c_init(struct omap_i2c_dev *dev)
 {
-	u16 psc = 0, scll = 0, sclh = 0, buf = 0;
+	u16 psc = 0, scll = 0, sclh = 0;
 	u16 fsscll = 0, fssclh = 0, hsscll = 0, hssclh = 0;
 	unsigned long fclk_rate = 12000000;
 	unsigned long timeout;
@@ -337,11 +361,8 @@  static int omap_i2c_init(struct omap_i2c_dev *dev)
 			 * REVISIT: Some wkup sources might not be needed.
 			 */
 			dev->westate = OMAP_I2C_WE_ALL;
-			omap_i2c_write_reg(dev, OMAP_I2C_WE_REG,
-							dev->westate);
 		}
 	}
-	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
 
 	if (dev->flags & OMAP_I2C_FLAG_ALWAYS_ARMXOR_CLK) {
 		/*
@@ -426,28 +447,18 @@  static int omap_i2c_init(struct omap_i2c_dev *dev)
 		sclh = fclk_rate / (dev->speed * 2) - 7 + psc;
 	}
 
-	/* Setup clock prescaler to obtain approx 12MHz I2C module clock: */
-	omap_i2c_write_reg(dev, OMAP_I2C_PSC_REG, psc);
-
-	/* SCL low and high time values */
-	omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG, scll);
-	omap_i2c_write_reg(dev, OMAP_I2C_SCLH_REG, sclh);
-
-	/* Take the I2C module out of reset: */
-	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
-
 	/* Enable interrupts */
 	dev->iestate = (OMAP_I2C_IE_XRDY | OMAP_I2C_IE_RRDY |
 			OMAP_I2C_IE_NACK | OMAP_I2C_IE_AL)  |
 			((dev->fifo_size) ? (OMAP_I2C_IE_RDR |
 				OMAP_I2C_IE_XDR) : 0);
-	omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, dev->iestate);
-	if (dev->flags & OMAP_I2C_FLAG_RESET_REGS_POSTIDLE) {
-		dev->pscstate = psc;
-		dev->scllstate = scll;
-		dev->sclhstate = sclh;
-		dev->bufstate = buf;
-	}
+
+	dev->pscstate = psc;
+	dev->scllstate = scll;
+	dev->sclhstate = sclh;
+
+	__omap_i2c_init(dev);
+
 	return 0;
 }
 
@@ -1267,23 +1278,8 @@  static int omap_i2c_runtime_resume(struct device *dev)
 {
 	struct omap_i2c_dev *_dev = dev_get_drvdata(dev);
 
-	if (_dev->flags & OMAP_I2C_FLAG_RESET_REGS_POSTIDLE) {
-		omap_i2c_write_reg(_dev, OMAP_I2C_CON_REG, 0);
-		omap_i2c_write_reg(_dev, OMAP_I2C_PSC_REG, _dev->pscstate);
-		omap_i2c_write_reg(_dev, OMAP_I2C_SCLL_REG, _dev->scllstate);
-		omap_i2c_write_reg(_dev, OMAP_I2C_SCLH_REG, _dev->sclhstate);
-		omap_i2c_write_reg(_dev, OMAP_I2C_BUF_REG, _dev->bufstate);
-		omap_i2c_write_reg(_dev, OMAP_I2C_SYSC_REG, _dev->syscstate);
-		omap_i2c_write_reg(_dev, OMAP_I2C_WE_REG, _dev->westate);
-		omap_i2c_write_reg(_dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
-	}
-
-	/*
-	 * Don't write to this register if the IE state is 0 as it can
-	 * cause deadlock.
-	 */
-	if (_dev->iestate)
-		omap_i2c_write_reg(_dev, OMAP_I2C_IE_REG, _dev->iestate);
+	if (_dev->flags & OMAP_I2C_FLAG_RESET_REGS_POSTIDLE)
+		__omap_i2c_init(_dev);
 
 	return 0;
 }