forked from Minki/linux
hwrng: bcm2835 - Read as much data as available
Read the requested number of data from the fifo Signed-off-by: Yendapally Reddy Dhananjaya Reddy <yendapally.reddy@broadcom.com> Reviewed-by: Eric Anholt <eric@anholt.net> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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@ -43,6 +43,8 @@ static int bcm2835_rng_read(struct hwrng *rng, void *buf, size_t max,
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bool wait)
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{
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void __iomem *rng_base = (void __iomem *)rng->priv;
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u32 max_words = max / sizeof(u32);
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u32 num_words, count;
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while ((__raw_readl(rng_base + RNG_STATUS) >> 24) == 0) {
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if (!wait)
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@ -50,8 +52,14 @@ static int bcm2835_rng_read(struct hwrng *rng, void *buf, size_t max,
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cpu_relax();
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}
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*(u32 *)buf = __raw_readl(rng_base + RNG_DATA);
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return sizeof(u32);
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num_words = readl(rng_base + RNG_STATUS) >> 24;
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if (num_words > max_words)
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num_words = max_words;
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for (count = 0; count < num_words; count++)
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((u32 *)buf)[count] = readl(rng_base + RNG_DATA);
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return num_words * sizeof(u32);
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}
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static struct hwrng bcm2835_rng_ops = {
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