[PATCH v1 1/1] driver: watchdog: Add mtk_wdt_init for mediatek watchdog hw init
From: Freddy Hsin <hidden>
Date: 2020-08-28 07:50:04
Also in:
linux-mediatek, linux-watchdog, lkml
Subsystem:
the rest, watchdog device drivers · Maintainers:
Linus Torvalds, Wim Van Sebroeck, Guenter Roeck
1. add a hw initialization function 2. enable/disable the watchdog depends on the original hw setting 3. set WDOD_HW_RUNNING in start function in order to start kicker after driver probe and clear the bit in stop function Change-Id: I25aa797f3b88288f26984455e499e599e27f09fa Signed-off-by: Freddy Hsin <redacted> --- drivers/watchdog/mtk_wdt.c | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-)
diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c
index d6a6393..59b5061 100644
--- a/drivers/watchdog/mtk_wdt.c
+++ b/drivers/watchdog/mtk_wdt.c@@ -57,6 +57,9 @@ static bool nowayout = WATCHDOG_NOWAYOUT; static unsigned int timeout; +static int mtk_wdt_start(struct watchdog_device *wdt_dev); +static int mtk_wdt_stop(struct watchdog_device *wdt_dev); + struct mtk_wdt_dev { struct watchdog_device wdt_dev; void __iomem *wdt_base;
@@ -148,6 +151,19 @@ static int toprgu_register_reset_controller(struct platform_device *pdev, return ret; } +static int mtk_wdt_init(struct watchdog_device *wdt_dev) +{ + struct mtk_wdt_dev *mtk_wdt = watchdog_get_drvdata(wdt_dev); + void __iomem *wdt_base; + + wdt_base = mtk_wdt->wdt_base; + + if (readl(wdt_base + WDT_MODE) & WDT_MODE_EN) + mtk_wdt_start(wdt_dev); + else + mtk_wdt_stop(wdt_dev); +} + static int mtk_wdt_restart(struct watchdog_device *wdt_dev, unsigned long action, void *data) {
@@ -206,6 +222,8 @@ static int mtk_wdt_stop(struct watchdog_device *wdt_dev) reg |= WDT_MODE_KEY; iowrite32(reg, wdt_base + WDT_MODE); + clear_bit(WDOG_HW_RUNNING, &wdt_dev->status); + return 0; }
@@ -225,6 +243,8 @@ static int mtk_wdt_start(struct watchdog_device *wdt_dev) reg |= (WDT_MODE_EN | WDT_MODE_KEY); iowrite32(reg, wdt_base + WDT_MODE); + set_bit(WDOG_HW_RUNNING, &wdt_dev->status); + return 0; }
@@ -274,7 +294,7 @@ static int mtk_wdt_probe(struct platform_device *pdev) watchdog_set_drvdata(&mtk_wdt->wdt_dev, mtk_wdt); - mtk_wdt_stop(&mtk_wdt->wdt_dev); + mtk_wdt_init(&mtk_wdt->wdt_dev); watchdog_stop_on_reboot(&mtk_wdt->wdt_dev); err = devm_watchdog_register_device(dev, &mtk_wdt->wdt_dev);
--
1.7.9.5
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