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hwrng: bcm2835 - Abstract I/O accessors 

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@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Florian Fainelli 2017-11-07 16:44:45 -08:00 committed by Herbert Xu
parent 791af4f490
commit abd42026ea
1 changed files with 19 additions and 8 deletions
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27
drivers/char/hw_random/bcm2835-rng.c
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@ -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();
}
num_words = readl(priv->base + RNG_STATUS) >> 24;
num_words = rng_readl(priv, RNG_STATUS) >> 24;
if (num_words > max_words)
num_words = max_words;
for (count = 0; count < num_words; count++)
((u32 *)buf)[count] = readl(priv->base + RNG_DATA);
((u32 *)buf)[count] = rng_readl(priv, RNG_DATA);
return num_words * sizeof(u32);
}
@ -79,14 +90,14 @@ static int bcm2835_rng_init(struct hwrng *rng)
if (priv->mask_interrupts) {
/* mask the interrupt */
val = readl(priv->base + RNG_INT_MASK);
val = rng_readl(priv, RNG_INT_MASK);
val |= RNG_INT_OFF;
writel(val, priv->base + RNG_INT_MASK);
rng_writel(priv, val, RNG_INT_MASK);
}
/* 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);
return ret;
}
@ -96,7 +107,7 @@ static void bcm2835_rng_cleanup(struct hwrng *rng)
struct bcm2835_rng_priv *priv = to_rng_priv(rng);
/* disable rng hardware */
__raw_writel(0, priv->base + RNG_CTRL);
rng_writel(priv, 0, RNG_CTRL);
if (!IS_ERR(priv->clk))
clk_disable_unprepare(priv->clk);