static int bcm63xx_rng_data_read(struct hwrng *rng, u32 *data)
{
struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
*data = __raw_readl(priv->regs + RNG_DATA);
return 4;
}
static void bcm63xx_rng_cleanup(struct hwrng *rng)
{
struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
u32 val;
val = bcm_readl(priv->regs + RNG_CTRL);
val &= ~RNG_EN;
bcm_writel(val, priv->regs + RNG_CTRL);
}
/*
* have data return 1, however return 0 if we have nothing
*/
static int timeriomem_rng_data_present(struct hwrng *rng, int wait)
{
struct timeriomem_rng_private_data *priv = to_rng_priv(rng);
if (!wait || priv->present)
return priv->present;
wait_for_completion(&priv->completion);
return 1;
}
static void bcm63xx_rng_cleanup(struct hwrng *rng)
{
struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
u32 val;
val = __raw_readl(priv->regs + RNG_CTRL);
val &= ~RNG_EN;
__raw_writel(val, priv->regs + RNG_CTRL);
clk_disable_unprepare(priv->clk);
}
static int bcm63xx_rng_init(struct hwrng *rng)
{
struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
u32 val;
val = bcm_readl(priv->regs + RNG_CTRL);
val |= RNG_EN;
bcm_writel(val, priv->regs + RNG_CTRL);
return 0;
}
static int bcm63xx_rng_remove(struct platform_device *pdev)
{
struct hwrng *rng = platform_get_drvdata(pdev);
struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
hwrng_unregister(rng);
clk_disable(priv->clk);
kfree(priv);
kfree(rng);
platform_set_drvdata(pdev, NULL);
return 0;
}
static int bcm63xx_rng_init(struct hwrng *rng)
{
struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
u32 val;
int error;
error = clk_prepare_enable(priv->clk);
if (error)
return error;
val = __raw_readl(priv->regs + RNG_CTRL);
val |= RNG_EN;
__raw_writel(val, priv->regs + RNG_CTRL);
return 0;
}
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;
*data = readl(priv->io_base);
cur = jiffies;
delay = cur - priv->expires;
delay = priv->period - (delay % priv->period);
priv->expires = cur + delay;
priv->present = 0;
INIT_COMPLETION(priv->completion);
mod_timer(&priv->timer, priv->expires);
return 4;
}
static int bcm63xx_rng_data_present(struct hwrng *rng, int wait)
{
struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
return __raw_readl(priv->regs + RNG_STAT) & RNG_AVAIL_MASK;
}