This driver enables first found watchdog as a system one and uses it as a system hardware watchdog device by providing hw_watchdog_reset(), hw_watchdog_disable() and void hw_watchdog_init() hooks.
Signed-off-by: Andy Shevchenko andriy.shevchenko@linux.intel.com ---
This is not a working solution, just an opinion to which direction we might go with ugly broken WDT class.
Feel free to ignore, drop, modify, etc.
drivers/watchdog/Kconfig | 8 +++++++ drivers/watchdog/Makefile | 1 + drivers/watchdog/wdt-hw.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 64 insertions(+) create mode 100644 drivers/watchdog/wdt-hw.c
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 0ed5aa987f..4837e73565 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -35,6 +35,14 @@ config WDT What exactly happens when the timer expires is up to a particular device/driver.
+config WDT_HW + bool "Enable hardware Watchdog Timer" + depends on WDT + select HW_WATCHDOG + help + Enable hardware Watchdog Timer. This is a glue driver to enable + first found watchdog device as a system one. + config WDT_SANDBOX bool "Enable Watchdog Timer support for Sandbox" depends on SANDBOX && WDT diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 0ad16f661e..c4a297e88b 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -16,6 +16,7 @@ obj-$(CONFIG_OMAP_WATCHDOG) += omap_wdt.o obj-$(CONFIG_DESIGNWARE_WATCHDOG) += designware_wdt.o obj-$(CONFIG_ULP_WATCHDOG) += ulp_wdog.o obj-$(CONFIG_WDT) += wdt-uclass.o +obj-$(CONFIG_WDT_HW) += wdt-hw.o obj-$(CONFIG_WDT_SANDBOX) += sandbox_wdt.o obj-$(CONFIG_WDT_ASPEED) += ast_wdt.o obj-$(CONFIG_WDT_BCM6345) += bcm6345_wdt.o diff --git a/drivers/watchdog/wdt-hw.c b/drivers/watchdog/wdt-hw.c new file mode 100644 index 0000000000..3e98db86c8 --- /dev/null +++ b/drivers/watchdog/wdt-hw.c @@ -0,0 +1,55 @@ +/* + * Copyright (c) 2017 Intel Corporation + * + * SPDX-License-Identifier: GPL-2.0+ + */ +#include <common.h> +#include <dm.h> +#include <wdt.h> + +/* Hardware timeout in milliseconds */ +#ifdef CONFIG_WATCHDOG_TIMEOUT_MSECS +#define WATCHDOG_HEARTBEAT CONFIG_WATCHDOG_TIMEOUT_MSECS +#else +#define WATCHDOG_HEARTBEAT 60000 +#endif + +static struct udevice *wdt; + +void hw_watchdog_reset(void) +{ + int ret; + + if (!wdt) + return; + + ret = wdt_reset(wdt); + if (ret) + printf("Can't reset watchdog device: %d\n", ret); +} + +void hw_watchdog_disable(void) +{ + int ret; + + if (!wdt) + return; + + ret = wdt_stop(wdt); + if (ret) + printf("Can't stop watchdog device: %d\n", ret); +} + +void hw_watchdog_init(void) +{ + int ret; + + ret = uclass_first_device(UCLASS_WDT, &wdt); + if (ret) + printf("Can't find watchdog device: %d\n", ret); + else { + ret = wdt_start(wdt, WATCHDOG_HEARTBEAT * 1000, 0); + if (ret) + printf("Can't start watchdog device: %d\n", ret); + } +}