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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: Yendapally Reddy Dhananjaya Reddy <yendapally.reddy@broadcom.com>
Acked-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Yendapally Reddy Dhananjaya Reddy 2016-05-27 06:10:39 -04:00 committed by Herbert Xu
parent f8e4f9a0a8
commit 422a749145
2 changed files with 31 additions and 5 deletions
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2
drivers/char/hw_random/Kconfig
View File

@ -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

34
drivers/char/hw_random/bcm2835-rng.c
View File

@ -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 = {