hwrng: timeriomem - Migrate to new API
Preserves the existing behavior of only returning 32-bits per call. Signed-off-by: Rick Altherr <raltherr@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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@ -20,18 +20,16 @@
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* TODO: add support for reading sizes other than 32bits and masking
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include <linux/completion.h>
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#include <linux/hw_random.h>
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#include <linux/io.h>
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#include <linux/jiffies.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/timeriomem-rng.h>
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#include <linux/jiffies.h>
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#include <linux/sched.h>
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#include <linux/timer.h>
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#include <linux/completion.h>
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struct timeriomem_rng_private_data {
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void __iomem *io_base;
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@ -45,32 +43,36 @@ struct timeriomem_rng_private_data {
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struct hwrng timeriomem_rng_ops;
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};
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#define to_rng_priv(rng) \
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((struct timeriomem_rng_private_data *)rng->priv)
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/*
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* have data return 1, however return 0 if we have nothing
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*/
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static int timeriomem_rng_data_present(struct hwrng *rng, int wait)
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static int timeriomem_rng_read(struct hwrng *hwrng, void *data,
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size_t max, bool wait)
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{
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struct timeriomem_rng_private_data *priv = to_rng_priv(rng);
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if (!wait || priv->present)
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return priv->present;
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wait_for_completion(&priv->completion);
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return 1;
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}
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static int timeriomem_rng_data_read(struct hwrng *rng, u32 *data)
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{
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struct timeriomem_rng_private_data *priv = to_rng_priv(rng);
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struct timeriomem_rng_private_data *priv =
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container_of(hwrng, struct timeriomem_rng_private_data,
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timeriomem_rng_ops);
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unsigned long cur;
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s32 delay;
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*data = readl(priv->io_base);
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/* The RNG provides 32-bit per read. Ensure there is enough space. */
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if (max < sizeof(u32))
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return 0;
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/*
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* There may not have been enough time for new data to be generated
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* since the last request. If the caller doesn't want to wait, let them
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* bail out. Otherwise, wait for the completion. If the new data has
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* already been generated, the completion should already be available.
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*/
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if (!wait && !priv->present)
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return 0;
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wait_for_completion(&priv->completion);
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*(u32 *)data = readl(priv->io_base);
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/*
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* Block any new callers until the RNG has had time to generate new
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* data.
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*/
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cur = jiffies;
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delay = cur - priv->expires;
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@ -154,9 +156,7 @@ static int timeriomem_rng_probe(struct platform_device *pdev)
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setup_timer(&priv->timer, timeriomem_rng_trigger, (unsigned long)priv);
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priv->timeriomem_rng_ops.name = dev_name(&pdev->dev);
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priv->timeriomem_rng_ops.data_present = timeriomem_rng_data_present;
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priv->timeriomem_rng_ops.data_read = timeriomem_rng_data_read;
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priv->timeriomem_rng_ops.priv = (unsigned long)priv;
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priv->timeriomem_rng_ops.read = timeriomem_rng_read;
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priv->io_base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(priv->io_base)) {
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