[v2,03/12] hwrng: bcm2835-rng: Move enabling to hwrng::init
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Message ID 20171108004449.32730-4-f.fainelli@gmail.com
State Accepted
Delegated to: Herbert Xu
Headers show

Commit Message

Florian Fainelli Nov. 8, 2017, 12:44 a.m. UTC
We should be moving the enabling of the HWRNG into a hwrng::init
callback since we can be disabled and enabled every time a different
hwrng is selected in the system.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/char/hw_random/bcm2835-rng.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

Patch
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diff --git a/drivers/char/hw_random/bcm2835-rng.c b/drivers/char/hw_random/bcm2835-rng.c
index 0d72147ab45b..82000a637504 100644
--- a/drivers/char/hw_random/bcm2835-rng.c
+++ b/drivers/char/hw_random/bcm2835-rng.c
@@ -72,6 +72,17 @@  static int bcm2835_rng_read(struct hwrng *rng, void *buf, size_t max,
 	return num_words * sizeof(u32);
 }
 
+static int bcm2835_rng_init(struct hwrng *rng)
+{
+	struct bcm2835_rng_priv *priv = to_rng_priv(rng);
+
+	/* set warm-up count & enable */
+	__raw_writel(RNG_WARMUP_COUNT, priv->base + RNG_STATUS);
+	__raw_writel(RNG_RBGEN, priv->base + RNG_CTRL);
+
+	return 0;
+}
+
 static const struct of_device_id bcm2835_rng_of_match[] = {
 	{ .compatible = "brcm,bcm2835-rng"},
 	{ .compatible = "brcm,bcm-nsp-rng", .data = nsp_rng_init},
@@ -105,6 +116,7 @@  static int bcm2835_rng_probe(struct platform_device *pdev)
 	}
 
 	priv->rng.name = "bcm2835-rng";
+	priv->rng.init = bcm2835_rng_init;
 	priv->rng.read = bcm2835_rng_read;
 
 	rng_id = of_match_node(bcm2835_rng_of_match, np);
@@ -116,10 +128,6 @@  static int bcm2835_rng_probe(struct platform_device *pdev)
 	if (rng_setup)
 		rng_setup(priv->base);
 
-	/* set warm-up count & enable */
-	__raw_writel(RNG_WARMUP_COUNT, priv->base + RNG_STATUS);
-	__raw_writel(RNG_RBGEN, priv->base + RNG_CTRL);
-
 	/* register driver */
 	err = hwrng_register(&priv->rng);
 	if (err)