From 04b154fa86afb6ccfd38ef9b563c098b13f5984d Mon Sep 17 00:00:00 2001 From: Florian Fainelli Date: Tue, 7 Nov 2017 16:44:43 -0800 Subject: 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 Reviewed-by: Eric Anholt Signed-off-by: Herbert Xu --- drivers/char/hw_random/bcm2835-rng.c | 39 +++++++++++++++++++++--------------- 1 file changed, 23 insertions(+), 16 deletions(-) (limited to 'drivers/char/hw_random') 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); -- cgit v1.2.3