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Commit 422a7491 authored by Yendapally Reddy Dhananjaya Reddy's avatar Yendapally Reddy Dhananjaya Reddy Committed by Herbert Xu
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hwrng: bcm2835 - Support Broadcom NSP SoC rng 



This supports the random number generator available in NSP SoC.
Masks the rng interrupt for NSP.

Signed-off-by: default avatarYendapally Reddy Dhananjaya Reddy <yendapally.reddy@broadcom.com>
Acked-by: default avatarEric Anholt <eric@anholt.net>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent f8e4f9a0

drivers/char/hw_random/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -90,7 +90,7 @@ config HW_RANDOM_BCM63XX 


config HW_RANDOM_BCM2835

	tristate "Broadcom BCM2835 Random Number Generator support"

	depends on ARCH_BCM2835

	depends on ARCH_BCM2835 || ARCH_BCM_NSP

	default HW_RANDOM

	---help---

	  This driver provides kernel-side support for the Random Number

drivers/char/hw_random/bcm2835-rng.c

+30 −4
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ 
#define RNG_CTRL	0x0

#define RNG_STATUS	0x4

#define RNG_DATA	0x8

#define RNG_INT_MASK	0x10



/* enable rng */

#define RNG_RBGEN	0x1
@@ -26,6 +27,18 @@ 
/* the initial numbers generated are "less random" so will be discarded */

#define RNG_WARMUP_COUNT 0x40000



#define RNG_INT_OFF	0x1



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 int bcm2835_rng_read(struct hwrng *rng, void *buf, size_t max,

			       bool wait)

{
@@ -46,10 +59,18 @@ static struct hwrng bcm2835_rng_ops = { 
	.read	= bcm2835_rng_read,

};



static const struct of_device_id bcm2835_rng_of_match[] = {

	{ .compatible = "brcm,bcm2835-rng"},

	{ .compatible = "brcm,bcm-nsp-rng", .data = nsp_rng_init},

	{},

};



static int bcm2835_rng_probe(struct platform_device *pdev)

{

	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;

	void __iomem *rng_base;

	int err;
@@ -61,6 +82,15 @@ static int bcm2835_rng_probe(struct platform_device *pdev) 
	}

	bcm2835_rng_ops.priv = (unsigned long)rng_base;



	rng_id = of_match_node(bcm2835_rng_of_match, np);

	if (!rng_id)

		return -EINVAL;



	/* Check for rng init function, execute it */

	rng_setup = rng_id->data;

	if (rng_setup)

		rng_setup(rng_base);



	/* set warm-up count & enable */

	__raw_writel(RNG_WARMUP_COUNT, rng_base + RNG_STATUS);

	__raw_writel(RNG_RBGEN, rng_base + RNG_CTRL);
@@ -90,10 +120,6 @@ static int bcm2835_rng_remove(struct platform_device *pdev) 
	return 0;

}



static const struct of_device_id bcm2835_rng_of_match[] = {

	{ .compatible = "brcm,bcm2835-rng", },

	{},

};

MODULE_DEVICE_TABLE(of, bcm2835_rng_of_match);



static struct platform_driver bcm2835_rng_driver = {