diff options
| author | Benoît Thébaudeau <benoit.thebaudeau@advansee.com> | 2012-06-13 18:15:34 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2012-06-27 14:42:00 +0800 |
| commit | 3621189064301a5fbb5d06ca17d966a026f4e501 (patch) | |
| tree | 6a53dfd095471cb4c776261de4f33d664c5a7254 /drivers/char | |
| parent | 398710379f516012c52d2ae396a9ba919bd6a7ab (diff) | |
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>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/hw_random/mxc-rnga.c | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/drivers/char/hw_random/mxc-rnga.c b/drivers/char/hw_random/mxc-rnga.c index 187c6be80f4..85074de5042 100644 --- a/drivers/char/hw_random/mxc-rnga.c +++ b/drivers/char/hw_random/mxc-rnga.c @@ -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; - - /* 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; + int i; + + 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) |