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hwrng: mxc-rnga - fix data_present API 

Commit 45001e9, which added support for RNGA, ignored the previous commit
984e976, which changed the data_present API.

Cc: Matt Mackall <mpm@selenic.com>
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: Alan Carvalho de Assis <acassis@gmail.com>
Cc: <linux-arm-kernel@lists.infradead.org>
Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Benoît Thébaudeau 2012-06-13 18:15:34 +02:00 committed by Herbert Xu
parent 398710379f
commit 3621189064
1 changed files with 12 additions and 7 deletions
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19
drivers/char/hw_random/mxc-rnga.c
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@ -24,6 +24,7 @@
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/hw_random.h>
#include <linux/delay.h>
#include <linux/io.h>
/* RNGA Registers */
@ -60,16 +61,20 @@
static struct platform_device *rng_dev;
static int mxc_rnga_data_present(struct hwrng *rng)
static int mxc_rnga_data_present(struct hwrng *rng, int wait)
{
int level;
void __iomem *rng_base = (void __iomem *)rng->priv;
int i;
/* how many random numbers is in FIFO? [0-16] */
level = ((__raw_readl(rng_base + RNGA_STATUS) &
RNGA_STATUS_LEVEL_MASK) >> 8);
return level > 0 ? 1 : 0;
for (i = 0; i < 20; i++) {
/* how many random numbers are in FIFO? [0-16] */
int level = (__raw_readl(rng_base + RNGA_STATUS) &
RNGA_STATUS_LEVEL_MASK) >> 8;
if (level || !wait)
return !!level;
udelay(10);
}
return 0;
}
static int mxc_rnga_data_read(struct hwrng *rng, u32 * data)