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reset: ath79: Add system restart support

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Add a system restart handler that use the FULL_CHIP_RESET bit of the
reset controller.

Signed-off-by: Alban Bedel <albeu@free.fr>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
This commit is contained in:
Alban Bedel 2015-11-24 01:00:33 +01:00 committed by Philipp Zabel
parent 3e14cd4c04
commit ba64e27e9d
1 changed files with 29 additions and 1 deletions
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30
drivers/reset/reset-ath79.c
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@ -15,13 +15,17 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/reset-controller.h>
#include <linux/reboot.h>
struct ath79_reset {
struct reset_controller_dev rcdev;
struct notifier_block restart_nb;
void __iomem *base;
spinlock_t lock;
};
#define FULL_CHIP_RESET 24
static int ath79_reset_update(struct reset_controller_dev *rcdev,
unsigned long id, bool assert)
{
@ -72,10 +76,22 @@ static struct reset_control_ops ath79_reset_ops = {
.status = ath79_reset_status,
};
static int ath79_reset_restart_handler(struct notifier_block *nb,
unsigned long action, void *data)
{
struct ath79_reset *ath79_reset =
container_of(nb, struct ath79_reset, restart_nb);
ath79_reset_assert(&ath79_reset->rcdev, FULL_CHIP_RESET);
return NOTIFY_DONE;
}
static int ath79_reset_probe(struct platform_device *pdev)
{
struct ath79_reset *ath79_reset;
struct resource *res;
int err;
ath79_reset = devm_kzalloc(&pdev->dev,
sizeof(*ath79_reset), GFP_KERNEL);
@ -96,13 +112,25 @@ static int ath79_reset_probe(struct platform_device *pdev)
ath79_reset->rcdev.of_reset_n_cells = 1;
ath79_reset->rcdev.nr_resets = 32;
return reset_controller_register(&ath79_reset->rcdev);
err = reset_controller_register(&ath79_reset->rcdev);
if (err)
return err;
ath79_reset->restart_nb.notifier_call = ath79_reset_restart_handler;
ath79_reset->restart_nb.priority = 128;
err = register_restart_handler(&ath79_reset->restart_nb);
if (err)
dev_warn(&pdev->dev, "Failed to register restart handler\n");
return 0;
}
static int ath79_reset_remove(struct platform_device *pdev)
{
struct ath79_reset *ath79_reset = platform_get_drvdata(pdev);
unregister_restart_handler(&ath79_reset->restart_nb);
reset_controller_unregister(&ath79_reset->rcdev);
return 0;