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hwrng: bcm2835 - Define a driver private context 

Instead of making hwrng::priv host the base register address, define a
driver private context, make it per platform device instance and pass it
down the different functions.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Florian Fainelli 2017-11-07 16:44:39 -08:00 committed by Herbert Xu
parent 21bb0ef43c
commit b788479f68
1 changed files with 34 additions and 21 deletions
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55
drivers/char/hw_random/bcm2835-rng.c
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@ -29,6 +29,11 @@
#define RNG_INT_OFF 0x1
struct bcm2835_rng_priv {
struct hwrng rng;
void __iomem *base;
};
static void __init nsp_rng_init(void __iomem *base)
{
u32 val;
@ -39,34 +44,34 @@ static void __init nsp_rng_init(void __iomem *base)
writel(val, base + RNG_INT_MASK);
}
static inline struct bcm2835_rng_priv *to_rng_priv(struct hwrng *rng)
{
return container_of(rng, struct bcm2835_rng_priv, rng);
}
static int bcm2835_rng_read(struct hwrng *rng, void *buf, size_t max,
bool wait)
{
void __iomem *rng_base = (void __iomem *)rng->priv;
struct bcm2835_rng_priv *priv = to_rng_priv(rng);
u32 max_words = max / sizeof(u32);
u32 num_words, count;
while ((__raw_readl(rng_base + RNG_STATUS) >> 24) == 0) {
while ((__raw_readl(priv->base + RNG_STATUS) >> 24) == 0) {
if (!wait)
return 0;
cpu_relax();
}
num_words = readl(rng_base + RNG_STATUS) >> 24;
num_words = readl(priv->base + RNG_STATUS) >> 24;
if (num_words > max_words)
num_words = max_words;
for (count = 0; count < num_words; count++)
((u32 *)buf)[count] = readl(rng_base + RNG_DATA);
((u32 *)buf)[count] = readl(priv->base + RNG_DATA);
return num_words * sizeof(u32);
}
static struct hwrng bcm2835_rng_ops = {
.name = "bcm2835",
.read = bcm2835_rng_read,
};
static const struct of_device_id bcm2835_rng_of_match[] = {
{ .compatible = "brcm,bcm2835-rng"},
{ .compatible = "brcm,bcm-nsp-rng", .data = nsp_rng_init},
@ -80,19 +85,27 @@ static int bcm2835_rng_probe(struct platform_device *pdev)
struct device_node *np = dev->of_node;
void (*rng_setup)(void __iomem *base);
const struct of_device_id *rng_id;
void __iomem *rng_base;
struct bcm2835_rng_priv *priv;
struct resource *r;
int err;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
platform_set_drvdata(pdev, priv);
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
/* map peripheral */
rng_base = devm_ioremap_resource(dev, r);
if (IS_ERR(rng_base)) {
priv->base = devm_ioremap_resource(dev, r);
if (IS_ERR(priv->base)) {
dev_err(dev, "failed to remap rng regs");
return PTR_ERR(rng_base);
return PTR_ERR(priv->base);
}
bcm2835_rng_ops.priv = (unsigned long)rng_base;
priv->rng.name = "bcm2835-rng";
priv->rng.read = bcm2835_rng_read;
rng_id = of_match_node(bcm2835_rng_of_match, np);
if (!rng_id)
@ -101,14 +114,14 @@ static int bcm2835_rng_probe(struct platform_device *pdev)
/* Check for rng init function, execute it */
rng_setup = rng_id->data;
if (rng_setup)
rng_setup(rng_base);
rng_setup(priv->base);
/* set warm-up count & enable */
__raw_writel(RNG_WARMUP_COUNT, rng_base + RNG_STATUS);
__raw_writel(RNG_RBGEN, rng_base + RNG_CTRL);
__raw_writel(RNG_WARMUP_COUNT, priv->base + RNG_STATUS);
__raw_writel(RNG_RBGEN, priv->base + RNG_CTRL);
/* register driver */
err = hwrng_register(&bcm2835_rng_ops);
err = hwrng_register(&priv->rng);
if (err)
dev_err(dev, "hwrng registration failed\n");
else
@ -119,13 +132,13 @@ static int bcm2835_rng_probe(struct platform_device *pdev)
static int bcm2835_rng_remove(struct platform_device *pdev)
{
void __iomem *rng_base = (void __iomem *)bcm2835_rng_ops.priv;
struct bcm2835_rng_priv *priv = platform_get_drvdata(pdev);
/* disable rng hardware */
__raw_writel(0, rng_base + RNG_CTRL);
__raw_writel(0, priv->base + RNG_CTRL);
/* unregister driver */
hwrng_unregister(&bcm2835_rng_ops);
hwrng_unregister(&priv->rng);
return 0;
}