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hwrng: bcm2835 - Rework interrupt masking 

The interrupt masking done for Northstart Plus and Northstar (BCM5301X)
is moved from being a function pointer mapped to of_device_id::data into
a proper part of the hwrng::init callback. While at it, we also make the
of_data be a proper structure indicating the platform specifics, since
the day we need to add a second type of platform information, we would
have to do that anyway.

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 16:44:43 -08:00 committed by Herbert Xu
parent 16a4c04b37
commit 04b154fa86
1 changed files with 23 additions and 16 deletions
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39
drivers/char/hw_random/bcm2835-rng.c
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@ -32,18 +32,9 @@
struct bcm2835_rng_priv {
struct hwrng rng;
void __iomem *base;
bool mask_interrupts;
};
static void __init nsp_rng_init(void __iomem *base)
{
u32 val;
/* mask the interrupt */
val = readl(base + RNG_INT_MASK);
val |= RNG_INT_OFF;
writel(val, base + RNG_INT_MASK);
}
static inline struct bcm2835_rng_priv *to_rng_priv(struct hwrng *rng)
{
return container_of(rng, struct bcm2835_rng_priv, rng);
@ -75,6 +66,14 @@ static int bcm2835_rng_read(struct hwrng *rng, void *buf, size_t max,
static int bcm2835_rng_init(struct hwrng *rng)
{
struct bcm2835_rng_priv *priv = to_rng_priv(rng);
u32 val;
if (priv->mask_interrupts) {
/* mask the interrupt */
val = readl(priv->base + RNG_INT_MASK);
val |= RNG_INT_OFF;
writel(val, priv->base + RNG_INT_MASK);
}
/* set warm-up count & enable */
__raw_writel(RNG_WARMUP_COUNT, priv->base + RNG_STATUS);
@ -91,18 +90,26 @@ static void bcm2835_rng_cleanup(struct hwrng *rng)
__raw_writel(0, priv->base + RNG_CTRL);
}
struct bcm2835_rng_of_data {
bool mask_interrupts;
};
static const struct bcm2835_rng_of_data nsp_rng_of_data = {
.mask_interrupts = true,
};
static const struct of_device_id bcm2835_rng_of_match[] = {
{ .compatible = "brcm,bcm2835-rng"},
{ .compatible = "brcm,bcm-nsp-rng", .data = nsp_rng_init},
{ .compatible = "brcm,bcm5301x-rng", .data = nsp_rng_init},
{ .compatible = "brcm,bcm-nsp-rng", .data = &nsp_rng_of_data },
{ .compatible = "brcm,bcm5301x-rng", .data = &nsp_rng_of_data },
{},
};
static int bcm2835_rng_probe(struct platform_device *pdev)
{
const struct bcm2835_rng_of_data *of_data;
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
void (*rng_setup)(void __iomem *base);
const struct of_device_id *rng_id;
struct bcm2835_rng_priv *priv;
struct resource *r;
@ -133,9 +140,9 @@ static int bcm2835_rng_probe(struct platform_device *pdev)
return -EINVAL;
/* Check for rng init function, execute it */
rng_setup = rng_id->data;
if (rng_setup)
rng_setup(priv->base);
of_data = rng_id->data;
if (of_data)
priv->mask_interrupts = of_data->mask_interrupts;
/* register driver */
err = devm_hwrng_register(dev, &priv->rng);