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watchdog: imgpdc: Add reboot support

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Register a restart handler that will restart the system by writing
to the watchdog's SOFT_RESET register.

Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
Reviewed-by: Ezequiel Garcia <ezequiel.garcia@imgtec.com>
Tested-by: Ezequiel Garcia <ezequiel.garcia@imgtec.com>
Cc: James Hogan <james.hogan@imgtec.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Andrew Bresticker 2015-04-03 10:05:22 -07:00 • committed by Wim Van Sebroeck
parent 8aa453a533
commit c631f20068
1 changed files with 21 additions and 0 deletions
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21
drivers/watchdog/imgpdc_wdt.c
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@ -16,6 +16,7 @@
#include <linux/log2.h> #include <linux/log2.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/platform_device.h> #include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/watchdog.h> #include <linux/watchdog.h>
@ -57,6 +58,7 @@ struct pdc_wdt_dev {
struct clk *wdt_clk; struct clk *wdt_clk;
struct clk *sys_clk; struct clk *sys_clk;
void __iomem *base; void __iomem *base;
struct notifier_block restart_handler;
}; };
static int pdc_wdt_keepalive(struct watchdog_device *wdt_dev) static int pdc_wdt_keepalive(struct watchdog_device *wdt_dev)
@ -136,6 +138,18 @@ static const struct watchdog_ops pdc_wdt_ops = {
.set_timeout = pdc_wdt_set_timeout, .set_timeout = pdc_wdt_set_timeout,
}; };
static int pdc_wdt_restart(struct notifier_block *this, unsigned long mode,
void *cmd)
{
struct pdc_wdt_dev *wdt = container_of(this, struct pdc_wdt_dev,
restart_handler);
/* Assert SOFT_RESET */
writel(0x1, wdt->base + PDC_WDT_SOFT_RESET);
return NOTIFY_OK;
}
static int pdc_wdt_probe(struct platform_device *pdev) static int pdc_wdt_probe(struct platform_device *pdev)
{ {
int ret, val; int ret, val;
@ -242,6 +256,13 @@ static int pdc_wdt_probe(struct platform_device *pdev)
if (ret) if (ret)
goto disable_wdt_clk; goto disable_wdt_clk;
pdc_wdt->restart_handler.notifier_call = pdc_wdt_restart;
pdc_wdt->restart_handler.priority = 128;
ret = register_restart_handler(&pdc_wdt->restart_handler);
if (ret)
dev_warn(&pdev->dev, "failed to register restart handler: %d\n",
ret);
return 0; return 0;
disable_wdt_clk: disable_wdt_clk: