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path: root/kernel/drivers/reset/reset-berlin.c
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Diffstat (limited to 'kernel/drivers/reset/reset-berlin.c')
-rw-r--r--kernel/drivers/reset/reset-berlin.c74
1 files changed, 28 insertions, 46 deletions
diff --git a/kernel/drivers/reset/reset-berlin.c b/kernel/drivers/reset/reset-berlin.c
index f8b48a13c..3c922d372 100644
--- a/kernel/drivers/reset/reset-berlin.c
+++ b/kernel/drivers/reset/reset-berlin.c
@@ -11,10 +11,12 @@
#include <linux/delay.h>
#include <linux/io.h>
+#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
+#include <linux/regmap.h>
#include <linux/reset-controller.h>
#include <linux/slab.h>
#include <linux/types.h>
@@ -25,8 +27,7 @@
container_of((p), struct berlin_reset_priv, rcdev)
struct berlin_reset_priv {
- void __iomem *base;
- unsigned int size;
+ struct regmap *regmap;
struct reset_controller_dev rcdev;
};
@@ -37,7 +38,7 @@ static int berlin_reset_reset(struct reset_controller_dev *rcdev,
int offset = id >> 8;
int mask = BIT(id & 0x1f);
- writel(mask, priv->base + offset);
+ regmap_write(priv->regmap, offset, mask);
/* let the reset be effective */
udelay(10);
@@ -52,7 +53,6 @@ static struct reset_control_ops berlin_reset_ops = {
static int berlin_reset_xlate(struct reset_controller_dev *rcdev,
const struct of_phandle_args *reset_spec)
{
- struct berlin_reset_priv *priv = to_berlin_reset_priv(rcdev);
unsigned offset, bit;
if (WARN_ON(reset_spec->args_count != rcdev->of_reset_n_cells))
@@ -61,71 +61,53 @@ static int berlin_reset_xlate(struct reset_controller_dev *rcdev,
offset = reset_spec->args[0];
bit = reset_spec->args[1];
- if (offset >= priv->size)
- return -EINVAL;
-
if (bit >= BERLIN_MAX_RESETS)
return -EINVAL;
return (offset << 8) | bit;
}
-static int __berlin_reset_init(struct device_node *np)
+static int berlin2_reset_probe(struct platform_device *pdev)
{
+ struct device_node *parent_np = of_get_parent(pdev->dev.of_node);
struct berlin_reset_priv *priv;
- struct resource res;
- resource_size_t size;
- int ret;
- priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
- ret = of_address_to_resource(np, 0, &res);
- if (ret)
- goto err;
-
- size = resource_size(&res);
- priv->base = ioremap(res.start, size);
- if (!priv->base) {
- ret = -ENOMEM;
- goto err;
- }
- priv->size = size;
+ priv->regmap = syscon_node_to_regmap(parent_np);
+ of_node_put(parent_np);
+ if (IS_ERR(priv->regmap))
+ return PTR_ERR(priv->regmap);
priv->rcdev.owner = THIS_MODULE;
priv->rcdev.ops = &berlin_reset_ops;
- priv->rcdev.of_node = np;
+ priv->rcdev.of_node = pdev->dev.of_node;
priv->rcdev.of_reset_n_cells = 2;
priv->rcdev.of_xlate = berlin_reset_xlate;
reset_controller_register(&priv->rcdev);
return 0;
-
-err:
- kfree(priv);
- return ret;
}
-static const struct of_device_id berlin_reset_of_match[] __initconst = {
- { .compatible = "marvell,berlin2-chip-ctrl" },
- { .compatible = "marvell,berlin2cd-chip-ctrl" },
- { .compatible = "marvell,berlin2q-chip-ctrl" },
+static const struct of_device_id berlin_reset_dt_match[] = {
+ { .compatible = "marvell,berlin2-reset" },
{ },
};
+MODULE_DEVICE_TABLE(of, berlin_reset_dt_match);
+
+static struct platform_driver berlin_reset_driver = {
+ .probe = berlin2_reset_probe,
+ .driver = {
+ .name = "berlin2-reset",
+ .of_match_table = berlin_reset_dt_match,
+ },
+};
+module_platform_driver(berlin_reset_driver);
-static int __init berlin_reset_init(void)
-{
- struct device_node *np;
- int ret;
-
- for_each_matching_node(np, berlin_reset_of_match) {
- ret = __berlin_reset_init(np);
- if (ret)
- return ret;
- }
-
- return 0;
-}
-arch_initcall(berlin_reset_init);
+MODULE_AUTHOR("Antoine Tenart <antoine.tenart@free-electrons.com>");
+MODULE_AUTHOR("Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>");
+MODULE_DESCRIPTION("Marvell Berlin reset driver");
+MODULE_LICENSE("GPL");