diff mbox series

[2/2] hwrng: iproc-rng200: Move enable/disable in separate function

Message ID 20201214160454.22769-2-matthias.bgg@kernel.org (mailing list archive)
State Superseded
Delegated to: Herbert Xu
Headers show
Series [1/2] hwrng: iproc-rng200: Fix disable of the block. | expand

Commit Message

Matthias Brugger Dec. 14, 2020, 4:04 p.m. UTC 
From: Matthias Brugger <mbrugger@suse.com>

We are calling the same code for enable and disable the block in various
parts of the driver. Put that code into a new function to reduce code
duplication.

Signed-off-by: Matthias Brugger <mbrugger@suse.com>

---

 drivers/char/hw_random/iproc-rng200.c | 37 ++++++++++++---------------
 1 file changed, 17 insertions(+), 20 deletions(-)

Comments

Florian Fainelli Dec. 14, 2020, 5:39 p.m. UTC | #1 
On 12/14/20 8:04 AM, matthias.bgg@kernel.org wrote:
> From: Matthias Brugger <mbrugger@suse.com>
> 
> We are calling the same code for enable and disable the block in various
> parts of the driver. Put that code into a new function to reduce code
> duplication.
> 
> Signed-off-by: Matthias Brugger <mbrugger@suse.com>
> 
> ---
> 
>  drivers/char/hw_random/iproc-rng200.c | 37 ++++++++++++---------------
>  1 file changed, 17 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c
> index e106ce3c0146..3367b26085e8 100644
> --- a/drivers/char/hw_random/iproc-rng200.c
> +++ b/drivers/char/hw_random/iproc-rng200.c
> @@ -53,15 +53,26 @@ struct iproc_rng200_dev {
>  
>  #define to_rng_priv(rng)	container_of(rng, struct iproc_rng200_dev, rng)
>  
> -static void iproc_rng200_restart(void __iomem *rng_base)
> +static void iproc_rng200_enable(void __iomem *rng_base, bool enable)

I would prefer naming the function iproc_rng200_enable_set() to indicate
that it sets the enable to the parameter value, this is just personal
taste, you may discard it.

>  {
>  	uint32_t val;

Since you are refactoring this into a new function, do you mind changing
the variable to u32 to match the kernel code? With that fixed:

Acked-by: Florian Fainelli <f.fainelli@gmail.com>

Thanks!
Scott Branden Dec. 14, 2020, 5:50 p.m. UTC | #2 
On 2020-12-14 8:04 a.m., matthias.bgg@kernel.org wrote:
> From: Matthias Brugger <mbrugger@suse.com>
>
> We are calling the same code for enable and disable the block in various
> parts of the driver. Put that code into a new function to reduce code
> duplication.
Patch needs to be regenerated after most of PATCH 1 dropped.
>
> Signed-off-by: Matthias Brugger <mbrugger@suse.com>
>
> ---
>
>  drivers/char/hw_random/iproc-rng200.c | 37 ++++++++++++---------------
>  1 file changed, 17 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c
> index e106ce3c0146..3367b26085e8 100644
> --- a/drivers/char/hw_random/iproc-rng200.c
> +++ b/drivers/char/hw_random/iproc-rng200.c
> @@ -53,15 +53,26 @@ struct iproc_rng200_dev {
>  
>  #define to_rng_priv(rng)	container_of(rng, struct iproc_rng200_dev, rng)
>  
> -static void iproc_rng200_restart(void __iomem *rng_base)
> +static void iproc_rng200_enable(void __iomem *rng_base, bool enable)
>  {
>  	uint32_t val;
>  
> -	/* Disable RBG */
>  	val = ioread32(rng_base + RNG_CTRL_OFFSET);
>  	val &= ~RNG_CTRL_RNG_RBGEN_MASK;
> -	val &= ~RNG_CTRL_RNG_RBGEN_ENABLE;
> +
> +	if (enable)
> +		val |= RNG_CTRL_RNG_RBGEN_ENABLE;
> +	else
> +		val &= ~RNG_CTRL_RNG_RBGEN_ENABLE;
> +
>  	iowrite32(val, rng_base + RNG_CTRL_OFFSET);
> +}
> +
> +static void iproc_rng200_restart(void __iomem *rng_base)
> +{
> +	uint32_t val;
> +
> +	iproc_rng200_enable(rng_base, false);
>  
>  	/* Clear all interrupt status */
>  	iowrite32(0xFFFFFFFFUL, rng_base + RNG_INT_STATUS_OFFSET);
> @@ -83,11 +94,7 @@ static void iproc_rng200_restart(void __iomem *rng_base)
>  	val &= ~RBG_SOFT_RESET;
>  	iowrite32(val, rng_base + RBG_SOFT_RESET_OFFSET);
>  
> -	/* Enable RBG */
> -	val = ioread32(rng_base + RNG_CTRL_OFFSET);
> -	val &= ~RNG_CTRL_RNG_RBGEN_MASK;
> -	val |= RNG_CTRL_RNG_RBGEN_ENABLE;
> -	iowrite32(val, rng_base + RNG_CTRL_OFFSET);
> +	iproc_rng200_enable(rng_base, true);
>  }
>  
>  static int iproc_rng200_read(struct hwrng *rng, void *buf, size_t max,
> @@ -154,13 +161,8 @@ static int iproc_rng200_read(struct hwrng *rng, void *buf, size_t max,
>  static int iproc_rng200_init(struct hwrng *rng)
>  {
>  	struct iproc_rng200_dev *priv = to_rng_priv(rng);
> -	uint32_t val;
>  
> -	/* Setup RNG. */
> -	val = ioread32(priv->base + RNG_CTRL_OFFSET);
> -	val &= ~RNG_CTRL_RNG_RBGEN_MASK;
> -	val |= RNG_CTRL_RNG_RBGEN_ENABLE;
> -	iowrite32(val, priv->base + RNG_CTRL_OFFSET);
> +	iproc_rng200_enable(priv->base, true);
>  
>  	return 0;
>  }
> @@ -168,13 +170,8 @@ static int iproc_rng200_init(struct hwrng *rng)
>  static void iproc_rng200_cleanup(struct hwrng *rng)
>  {
>  	struct iproc_rng200_dev *priv = to_rng_priv(rng);
> -	uint32_t val;
>  
> -	/* Disable RNG hardware */
> -	val = ioread32(priv->base + RNG_CTRL_OFFSET);
> -	val &= ~RNG_CTRL_RNG_RBGEN_MASK;
> -	val &= ~RNG_CTRL_RNG_RBGEN_ENABLE;
> -	iowrite32(val, priv->base + RNG_CTRL_OFFSET);
> +	iproc_rng200_enable(priv->base, false);
>  }
>  
>  static int iproc_rng200_probe(struct platform_device *pdev)
diff mbox series

Patch

diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c
index e106ce3c0146..3367b26085e8 100644
--- a/drivers/char/hw_random/iproc-rng200.c
+++ b/drivers/char/hw_random/iproc-rng200.c
@@ -53,15 +53,26 @@  struct iproc_rng200_dev {
 
 #define to_rng_priv(rng)	container_of(rng, struct iproc_rng200_dev, rng)
 
-static void iproc_rng200_restart(void __iomem *rng_base)
+static void iproc_rng200_enable(void __iomem *rng_base, bool enable)
 {
 	uint32_t val;
 
-	/* Disable RBG */
 	val = ioread32(rng_base + RNG_CTRL_OFFSET);
 	val &= ~RNG_CTRL_RNG_RBGEN_MASK;
-	val &= ~RNG_CTRL_RNG_RBGEN_ENABLE;
+
+	if (enable)
+		val |= RNG_CTRL_RNG_RBGEN_ENABLE;
+	else
+		val &= ~RNG_CTRL_RNG_RBGEN_ENABLE;
+
 	iowrite32(val, rng_base + RNG_CTRL_OFFSET);
+}
+
+static void iproc_rng200_restart(void __iomem *rng_base)
+{
+	uint32_t val;
+
+	iproc_rng200_enable(rng_base, false);
 
 	/* Clear all interrupt status */
 	iowrite32(0xFFFFFFFFUL, rng_base + RNG_INT_STATUS_OFFSET);
@@ -83,11 +94,7 @@  static void iproc_rng200_restart(void __iomem *rng_base)
 	val &= ~RBG_SOFT_RESET;
 	iowrite32(val, rng_base + RBG_SOFT_RESET_OFFSET);
 
-	/* Enable RBG */
-	val = ioread32(rng_base + RNG_CTRL_OFFSET);
-	val &= ~RNG_CTRL_RNG_RBGEN_MASK;
-	val |= RNG_CTRL_RNG_RBGEN_ENABLE;
-	iowrite32(val, rng_base + RNG_CTRL_OFFSET);
+	iproc_rng200_enable(rng_base, true);
 }
 
 static int iproc_rng200_read(struct hwrng *rng, void *buf, size_t max,
@@ -154,13 +161,8 @@  static int iproc_rng200_read(struct hwrng *rng, void *buf, size_t max,
 static int iproc_rng200_init(struct hwrng *rng)
 {
 	struct iproc_rng200_dev *priv = to_rng_priv(rng);
-	uint32_t val;
 
-	/* Setup RNG. */
-	val = ioread32(priv->base + RNG_CTRL_OFFSET);
-	val &= ~RNG_CTRL_RNG_RBGEN_MASK;
-	val |= RNG_CTRL_RNG_RBGEN_ENABLE;
-	iowrite32(val, priv->base + RNG_CTRL_OFFSET);
+	iproc_rng200_enable(priv->base, true);
 
 	return 0;
 }
@@ -168,13 +170,8 @@  static int iproc_rng200_init(struct hwrng *rng)
 static void iproc_rng200_cleanup(struct hwrng *rng)
 {
 	struct iproc_rng200_dev *priv = to_rng_priv(rng);
-	uint32_t val;
 
-	/* Disable RNG hardware */
-	val = ioread32(priv->base + RNG_CTRL_OFFSET);
-	val &= ~RNG_CTRL_RNG_RBGEN_MASK;
-	val &= ~RNG_CTRL_RNG_RBGEN_ENABLE;
-	iowrite32(val, priv->base + RNG_CTRL_OFFSET);
+	iproc_rng200_enable(priv->base, false);
 }
 
 static int iproc_rng200_probe(struct platform_device *pdev)