linux-kernel - Re: [PATCH v2 2/2] hwrng: iproc-rng200: Move enable/disable in separate function

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Message-ID: <fe0bd5cf-b48b-d7e6-c20c-6f8d0ae7aeb5@broadcom.com>
Date:   Fri, 18 Dec 2020 09:32:09 -0800
From:   Scott Branden <scott.branden@...adcom.com>
To:     matthias.bgg@...nel.org, mpm@...enic.com,
        herbert@...dor.apana.org.au, rjui@...adcom.com,
        sbranden@...adcom.com, f.fainelli@...il.com
Cc:     linux-kernel@...r.kernel.org, Julia.Lawall@...ia.fr,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org, nsaenzjulienne@...e.de,
        linux-crypto@...r.kernel.org, Matthias Brugger <mbrugger@...e.com>
Subject: Re: [PATCH v2 2/2] hwrng: iproc-rng200: Move enable/disable in
 separate function



On 2020-12-18 2:57 a.m., matthias.bgg@...nel.org wrote:
> From: Matthias Brugger <mbrugger@...e.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@...e.com>
> Acked-by: Florian Fainelli <f.fainelli@...il.com>
Acked-by: Scott Branden <scott.branden@...adcom.com>
>
> ---
>
> Changes in v2:
> - rename function to iproc_rng200_enable_set()
> - use u32 value instead of uint32_t
>
>  drivers/char/hw_random/iproc-rng200.c | 35 ++++++++++++---------------
>  1 file changed, 16 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c
> index 70cd818a0f31..a43743887db1 100644
> --- a/drivers/char/hw_random/iproc-rng200.c
> +++ b/drivers/char/hw_random/iproc-rng200.c
> @@ -53,14 +53,24 @@ 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_set(void __iomem *rng_base, bool enable)
>  {
> -	uint32_t val;
> +	u32 val;
>  
> -	/* Disable RBG */
>  	val = ioread32(rng_base + RNG_CTRL_OFFSET);
>  	val &= ~RNG_CTRL_RNG_RBGEN_MASK;
> +
> +	if (enable)
> +		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_set(rng_base, false);
>  
>  	/* Clear all interrupt status */
>  	iowrite32(0xFFFFFFFFUL, rng_base + RNG_INT_STATUS_OFFSET);
> @@ -82,11 +92,7 @@ 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_set(rng_base, true);
>  }
>  
>  static int iproc_rng200_read(struct hwrng *rng, void *buf, size_t max,
> @@ -153,13 +159,8 @@ 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_set(priv->base, true);
>  
>  	return 0;
>  }
> @@ -167,12 +168,8 @@ 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;
> -	iowrite32(val, priv->base + RNG_CTRL_OFFSET);
> +	iproc_rng200_enable_set(priv->base, false);
>  }
>  
>  static int iproc_rng200_probe(struct platform_device *pdev)