Florian Fainelli <f.fainelli@xxxxxxxxx> writes:
> In preparation for allowing BCM63xx to use this driver, we abstract I/O
> accessors such that we can easily change those later on.
>
> Signed-off-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
> ---
> drivers/char/hw_random/bcm2835-rng.c | 27 +++++++++++++++++++--------
> 1 file changed, 19 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/char/hw_random/bcm2835-rng.c b/drivers/char/hw_random/bcm2835-rng.c
> index 35928efb52e7..500275d55044 100644
> --- a/drivers/char/hw_random/bcm2835-rng.c
> +++ b/drivers/char/hw_random/bcm2835-rng.c
> @@ -42,6 +42,17 @@ static inline struct bcm2835_rng_priv *to_rng_priv(struct hwrng *rng)
> return container_of(rng, struct bcm2835_rng_priv, rng);
> }
>
> +static inline u32 rng_readl(struct bcm2835_rng_priv *priv, u32 offset)
> +{
> + return readl(priv->base + offset);
> +}
> +
> +static inline void rng_writel(struct bcm2835_rng_priv *priv, u32 val,
> + u32 offset)
> +{
> + writel(val, priv->base + offset);
> +}
> +
> static int bcm2835_rng_read(struct hwrng *rng, void *buf, size_t max,
> bool wait)
> {
> @@ -49,18 +60,18 @@ static int bcm2835_rng_read(struct hwrng *rng, void *buf, size_t max,
> u32 max_words = max / sizeof(u32);
> u32 num_words, count;
>
> - while ((__raw_readl(priv->base + RNG_STATUS) >> 24) == 0) {
> + while ((rng_readl(priv, RNG_STATUS) >> 24) == 0) {
> if (!wait)
> return 0;
> cpu_relax();
> }
What was the difference between the __raw_readl and readl that's now
being done in the new call? Is it important?
> /* set warm-up count & enable */
> - __raw_writel(RNG_WARMUP_COUNT, priv->base + RNG_STATUS);
> - __raw_writel(RNG_RBGEN, priv->base + RNG_CTRL);
> + rng_writel(priv, RNG_WARMUP_COUNT, RNG_STATUS);
> + rng_writel(priv, RNG_RBGEN, RNG_CTRL);
Similar question.
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