[PATCH 06/12] hwrng: bcm2835-rng: Rework interrupt masking

[Florian Fainelli]

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.faine...@gmail.com>
---
 drivers/char/hw_random/bcm2835-rng.c | 39 +++++++++++++++++++++---------------
 1 file changed, 23 insertions(+), 16 deletions(-)

diff --git a/drivers/char/hw_random/bcm2835-rng.c 
b/drivers/char/hw_random/bcm2835-rng.c
index 67b9bd3be28d..ed20e0b6b7ae 100644
--- a/drivers/char/hw_random/bcm2835-rng.c
+++ b/drivers/char/hw_random/bcm2835-rng.c
@@ -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);
-- 
2.9.3