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

From: Scott Branden <scott.branden@broadcom.com>
To: matthias.bgg@kernel.org, mpm@selenic.com,
	herbert@gondor.apana.org.au, rjui@broadcom.com,
	sbranden@broadcom.com, f.fainelli@gmail.com
Cc: Matthias Brugger <mbrugger@suse.com>,
	linux-kernel@vger.kernel.org, Julia.Lawall@inria.fr,
	bcm-kernel-feedback-list@broadcom.com,
	linux-arm-kernel@lists.infradead.org, nsaenzjulienne@suse.de,
	linux-crypto@vger.kernel.org
Subject: Re: [PATCH 2/2] hwrng: iproc-rng200: Move enable/disable in separate function
Date: Mon, 14 Dec 2020 09:50:24 -0800	[thread overview]
Message-ID: <9f87ad0f-b281-33f4-b81d-e62a37d536fc@broadcom.com> (raw)
In-Reply-To: <20201214160454.22769-2-matthias.bgg@kernel.org>


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)


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