mach-moxart lacks a separate register for reset; as a workaround,
add a function that can be hooked to arm_pm_restart.
Signed-off-by: Jonas Jensen <jonas.jensen@xxxxxxxxx>
---
Notes:
During review of this driver, the restart handler for moxart was
removed, and moved to platform code under arch/arm/mach-moxart/.
Since then, new considerations arrived,
see replies from Arnd and Guenter:
"[PATCH v4 1/2] ARM: mach-moxart: add MOXA ART SoC platform files"
http://lists.infradead.org/pipermail/linux-arm-kernel/2013-December/219175.html
I can move this to a new power/restart driver, but first, I want to
hear what Wim or others think.
Until there is a better solution, my motivation is that this uses
the watchdog. The way I see it, the problem is that there is no
separate register for reset, this was always a workaround for that.
Applies to next-20131218
drivers/watchdog/moxart_wdt.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/watchdog/moxart_wdt.c b/drivers/watchdog/moxart_wdt.c
index 4166e4d..4aa3a8a 100644
--- a/drivers/watchdog/moxart_wdt.c
+++ b/drivers/watchdog/moxart_wdt.c
@@ -19,6 +19,8 @@
#include <linux/watchdog.h>
#include <linux/moduleparam.h>
+#include <asm/system_misc.h>
+
#define REG_COUNT 0x4
#define REG_MODE 0x8
#define REG_ENABLE 0xC
@@ -29,8 +31,17 @@ struct moxart_wdt_dev {
unsigned int clock_frequency;
};
+static struct moxart_wdt_dev *moxart_restart_ctx;
+
static int heartbeat;
+static void moxart_wdt_restart(enum reboot_mode reboot_mode, const char *cmd)
+{
+ writel(1, moxart_restart_ctx->base + REG_COUNT);
+ writel(0x5ab9, moxart_restart_ctx->base + REG_MODE);
+ writel(0x03, moxart_restart_ctx->base + REG_ENABLE);
+}
+
static int moxart_wdt_stop(struct watchdog_device *wdt_dev)
{
struct moxart_wdt_dev *moxart_wdt = watchdog_get_drvdata(wdt_dev);
@@ -125,6 +136,9 @@ static int moxart_wdt_probe(struct platform_device *pdev)
if (err)
return err;
+ moxart_restart_ctx = moxart_wdt;
+ arm_pm_restart = moxart_wdt_restart;
+
dev_dbg(dev, "Watchdog enabled (heartbeat=%d sec, nowayout=%d)\n",
moxart_wdt->dev.timeout, nowayout);
@@ -135,6 +149,7 @@ static int moxart_wdt_remove(struct platform_device *pdev)
{
struct moxart_wdt_dev *moxart_wdt = platform_get_drvdata(pdev);
+ arm_pm_restart = NULL;
moxart_wdt_stop(&moxart_wdt->dev);
watchdog_unregister_device(&moxart_wdt->dev);
--
1.8.2.1
--
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