[HWRNG]: move status polling loop to data_present callbacks
Handle waiting for new random within the drivers themselves, this allows to
use better suited timeouts for the individual rngs.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Acked-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/drivers/char/hw_random/pasemi-rng.c b/drivers/char/hw_random/pasemi-rng.c
index fa6040b..621adf2 100644
--- a/drivers/char/hw_random/pasemi-rng.c
+++ b/drivers/char/hw_random/pasemi-rng.c
@@ -23,6 +23,7 @@
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/hw_random.h>
+#include <linux/delay.h>
#include <asm/of_platform.h>
#include <asm/io.h>
@@ -44,9 +45,16 @@
static int pasemi_rng_data_present(struct hwrng *rng)
{
void __iomem *rng_regs = (void __iomem *)rng->priv;
+ int data, i;
- return (in_le32(rng_regs + SDCRNG_CTL_REG)
- & SDCRNG_CTL_FVLD_M) ? 1 : 0;
+ for (i = 0; i < 20; i++) {
+ data = (in_le32(rng_regs + SDCRNG_CTL_REG)
+ & SDCRNG_CTL_FVLD_M) ? 1 : 0;
+ if (data || !wait)
+ break;
+ udelay(10);
+ }
+ return data;
}
static int pasemi_rng_data_read(struct hwrng *rng, u32 *data)