Commit 7acd4de7 authored by Rick Altherr's avatar Rick Altherr Committed by Herbert Xu

hwrng: timeriomem - Migrate to new API

Preserves the existing behavior of only returning 32-bits per call.
Signed-off-by: default avatarRick Altherr <raltherr@google.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 42ae2922
......@@ -20,18 +20,16 @@
* TODO: add support for reading sizes other than 32bits and masking
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/completion.h>
#include <linux/hw_random.h>
#include <linux/io.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/timeriomem-rng.h>
#include <linux/jiffies.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/completion.h>
struct timeriomem_rng_private_data {
void __iomem *io_base;
......@@ -45,32 +43,36 @@ struct timeriomem_rng_private_data {
struct hwrng timeriomem_rng_ops;
};
#define to_rng_priv(rng) \
((struct timeriomem_rng_private_data *)rng->priv)
/*
* have data return 1, however return 0 if we have nothing
*/
static int timeriomem_rng_data_present(struct hwrng *rng, int wait)
static int timeriomem_rng_read(struct hwrng *hwrng, void *data,
size_t max, bool wait)
{
struct timeriomem_rng_private_data *priv = to_rng_priv(rng);
struct timeriomem_rng_private_data *priv =
container_of(hwrng, struct timeriomem_rng_private_data,
timeriomem_rng_ops);
unsigned long cur;
s32 delay;
if (!wait || priv->present)
return priv->present;
/* The RNG provides 32-bit per read. Ensure there is enough space. */
if (max < sizeof(u32))
return 0;
wait_for_completion(&priv->completion);
/*
* There may not have been enough time for new data to be generated
* since the last request. If the caller doesn't want to wait, let them
* bail out. Otherwise, wait for the completion. If the new data has
* already been generated, the completion should already be available.
*/
if (!wait && !priv->present)
return 0;
return 1;
}
static int timeriomem_rng_data_read(struct hwrng *rng, u32 *data)
{
struct timeriomem_rng_private_data *priv = to_rng_priv(rng);
unsigned long cur;
s32 delay;
wait_for_completion(&priv->completion);
*data = readl(priv->io_base);
*(u32 *)data = readl(priv->io_base);
/*
* Block any new callers until the RNG has had time to generate new
* data.
*/
cur = jiffies;
delay = cur - priv->expires;
......@@ -154,9 +156,7 @@ static int timeriomem_rng_probe(struct platform_device *pdev)
setup_timer(&priv->timer, timeriomem_rng_trigger, (unsigned long)priv);
priv->timeriomem_rng_ops.name = dev_name(&pdev->dev);
priv->timeriomem_rng_ops.data_present = timeriomem_rng_data_present;
priv->timeriomem_rng_ops.data_read = timeriomem_rng_data_read;
priv->timeriomem_rng_ops.priv = (unsigned long)priv;
priv->timeriomem_rng_ops.read = timeriomem_rng_read;
priv->io_base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(priv->io_base)) {
......
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