From 1944cc894fd4d2ecce9bab6940e464afbde4fef0 Mon Sep 17 00:00:00 2001
From: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
Date: Wed, 19 May 2010 06:49:13 +0100
Subject: ARM: 6137/1: nomadik hwrng: Add clock support

This adds the clock support to the Nomadik RNG driver

Signed-off-by: srinidhi kasagar <srinidhi.kasagar@stericsson.com>
Acked-by: Linus walleij <linus.walleij@stericsson.com>
Acked-by: Alessandro Rubini <rubini@unipv.it>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 drivers/char/hw_random/nomadik-rng.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'drivers/char')

diff --git a/drivers/char/hw_random/nomadik-rng.c b/drivers/char/hw_random/nomadik-rng.c
index a8b4c40..a348c7e 100644
--- a/drivers/char/hw_random/nomadik-rng.c
+++ b/drivers/char/hw_random/nomadik-rng.c
@@ -15,6 +15,10 @@
 #include <linux/amba/bus.h>
 #include <linux/hw_random.h>
 #include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+
+static struct clk *rng_clk;
 
 static int nmk_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
 {
@@ -40,6 +44,15 @@ static int nmk_rng_probe(struct amba_device *dev, struct amba_id *id)
 	void __iomem *base;
 	int ret;
 
+	rng_clk = clk_get(&dev->dev, NULL);
+	if (IS_ERR(rng_clk)) {
+		dev_err(&dev->dev, "could not get rng clock\n");
+		ret = PTR_ERR(rng_clk);
+		return ret;
+	}
+
+	clk_enable(rng_clk);
+
 	ret = amba_request_regions(dev, dev->dev.init_name);
 	if (ret)
 		return ret;
@@ -57,6 +70,8 @@ out_unmap:
 	iounmap(base);
 out_release:
 	amba_release_regions(dev);
+	clk_disable(rng_clk);
+	clk_put(rng_clk);
 	return ret;
 }
 
@@ -66,6 +81,8 @@ static int nmk_rng_remove(struct amba_device *dev)
 	hwrng_unregister(&nmk_rng);
 	iounmap(base);
 	amba_release_regions(dev);
+	clk_disable(rng_clk);
+	clk_put(rng_clk);
 	return 0;
 }
 
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