diff options
| author | Paul Mackerras <paulus@samba.org> | 2008-01-31 11:25:51 +1100 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2008-01-31 11:25:51 +1100 |
| commit | bd45ac0c5daae35e7c71138172e63df5cf644cf6 (patch) | |
| tree | 5eb5a599bf6a9d7a8a34e802db932aa9e9555de4 /drivers/char/hw_random/pasemi-rng.c | |
| parent | 4eece4ccf997c0e6d8fdad3d842e37b16b8d705f (diff) | |
| parent | 5bdeae46be6dfe9efa44a548bd622af325f4bdb4 (diff) | |
Merge branch 'linux-2.6'
Diffstat (limited to 'drivers/char/hw_random/pasemi-rng.c')
| -rw-r--r-- | drivers/char/hw_random/pasemi-rng.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/drivers/char/hw_random/pasemi-rng.c b/drivers/char/hw_random/pasemi-rng.c index 24ae3073991..6d50e9bc700 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> @@ -41,12 +42,19 @@ #define MODULE_NAME "pasemi_rng" -static int pasemi_rng_data_present(struct hwrng *rng) +static int pasemi_rng_data_present(struct hwrng *rng, int wait) { void __iomem *rng_regs = (void __iomem *)rng->priv; - - return (in_le32(rng_regs + SDCRNG_CTL_REG) - & SDCRNG_CTL_FVLD_M) ? 1 : 0; + int data, i; + + 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) |