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

Scott Branden
2020-12-14T17:51:55Z

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)