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hwrng: bcm63xx - make use of devm_hwrng_register 

This change converts bcm63xx-rng to use devm* API for managing all
resources, which allows us to dispense with the rest of error handling
path and remove() function. Also we combine hwern and driver-private
data into a single allocation, use clk_prepare_enable() instead
of "naked" clk_enable() and move clock enabling/disabling into hwrnd
inti(0 and cleanup() methods so the clock stays off until rng is
used.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Dmitry Torokhov 2015-03-12 14:00:03 -07:00 committed by Herbert Xu
parent 4d9b519c9b
commit 6229c16060
1 changed files with 31 additions and 56 deletions
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87
drivers/char/hw_random/bcm63xx-rng.c
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@ -24,16 +24,22 @@
#define RNG_MASK 0x10
struct bcm63xx_rng_priv {
struct hwrng rng;
struct clk *clk;
void __iomem *regs;
};
#define to_rng_priv(rng) ((struct bcm63xx_rng_priv *)rng->priv)
#define to_rng_priv(rng) container_of(rng, struct bcm63xx_rng_priv, rng)
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;
@ -50,6 +56,8 @@ static void bcm63xx_rng_cleanup(struct hwrng *rng)
val = __raw_readl(priv->regs + RNG_CTRL);
val &= ~RNG_EN;
__raw_writel(val, priv->regs + RNG_CTRL);
clk_didsable_unprepare(prov->clk);
}
static int bcm63xx_rng_data_present(struct hwrng *rng, int wait)
@ -79,86 +87,53 @@ static int bcm63xx_rng_probe(struct platform_device *pdev)
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r) {
dev_err(&pdev->dev, "no iomem resource\n");
ret = -ENXIO;
goto out;
return -ENXIO;
}
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv) {
ret = -ENOMEM;
goto out;
if (!priv)
return -ENOMEM;
priv->rng.name = pdev->name;
priv->rng.init = bcm63xx_rng_init;
priv->rng.cleanup = bcm63xx_rng_cleanup;
prov->rng.data_present = bcm63xx_rng_data_present;
priv->rng.data_read = bcm63xx_rng_data_read;
priv->clk = devm_clk_get(&pdev->dev, "ipsec");
if (IS_ERR(priv->clk)) {
error = PTR_ERR(priv->clk);
dev_err(&pdev->dev, "no clock for device: %d\n", error);
return error;
}
rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);
if (!rng) {
ret = -ENOMEM;
goto out;
}
platform_set_drvdata(pdev, rng);
rng->priv = (unsigned long)priv;
rng->name = pdev->name;
rng->init = bcm63xx_rng_init;
rng->cleanup = bcm63xx_rng_cleanup;
rng->data_present = bcm63xx_rng_data_present;
rng->data_read = bcm63xx_rng_data_read;
clk = clk_get(&pdev->dev, "ipsec");
if (IS_ERR(clk)) {
dev_err(&pdev->dev, "no clock for device\n");
ret = PTR_ERR(clk);
goto out;
}
priv->clk = clk;
if (!devm_request_mem_region(&pdev->dev, r->start,
resource_size(r), pdev->name)) {
dev_err(&pdev->dev, "request mem failed");
ret = -ENOMEM;
goto out;
return -EBUSY;
}
priv->regs = devm_ioremap_nocache(&pdev->dev, r->start,
resource_size(r));
if (!priv->regs) {
dev_err(&pdev->dev, "ioremap failed");
ret = -ENOMEM;
goto out;
return -ENOMEM;
}
clk_enable(clk);
ret = hwrng_register(rng);
if (ret) {
dev_err(&pdev->dev, "failed to register rng device\n");
goto out_clk_disable;
error = devm_hwrng_register(&pdev->dev, &priv->rng);
if (error) {
dev_err(&pdev->dev, "failed to register rng device: %d\n",
error);
return error;
}
dev_info(&pdev->dev, "registered RNG driver\n");
return 0;
out_clk_disable:
clk_disable(clk);
out:
return ret;
}
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);
return 0;
}
static struct platform_driver bcm63xx_rng_driver = {
.probe = bcm63xx_rng_probe,
.remove = bcm63xx_rng_remove,
.driver = {
.name = "bcm63xx-rng",
},