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@xxxxxxxxx>
---
drivers/char/hw_random/bcm63xx-rng.c | 87 +++++++++++++-----------------------
1 file changed, 31 insertions(+), 56 deletions(-)
diff --git a/drivers/char/hw_random/bcm63xx-rng.c b/drivers/char/hw_random/bcm63xx-rng.c
index 27da00f..d1494ec 100644
--- a/drivers/char/hw_random/bcm63xx-rng.c
+++ b/drivers/char/hw_random/bcm63xx-rng.c
@@ -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;
- }
-
- rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);
- if (!rng) {
- 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;
}
- 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",
},
--
2.2.0.rc0.207.ga3a616c
--
To unsubscribe from this list: send the line "unsubscribe linux-crypto" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
