[U-Boot] [PATCH] mxs: add watchdog

Alexey Ignatov
2014-10-08T03:14:51Z

Use RTC watchdog feature as hardware watchdog.

Signed-off-by: Alexey Ignatov <lexszero@gmail.com>
---
drivers/watchdog/Makefile | 1 +
drivers/watchdog/mxsrtc_wdt.c | 23 +++++++++++++++++++++++
include/configs/mxs.h | 4 ++++
3 files changed, 28 insertions(+)
create mode 100644 drivers/watchdog/mxsrtc_wdt.c

diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 0276a10..ffe42d1 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -16,3 +16,4 @@ obj-$(CONFIG_XILINX_TB_WATCHDOG) += xilinx_tb_wdt.o
obj-$(CONFIG_BFIN_WATCHDOG) += bfin_wdt.o
obj-$(CONFIG_OMAP_WATCHDOG) += omap_wdt.o
obj-$(CONFIG_DESIGNWARE_WATCHDOG) += designware_wdt.o
+obj-$(CONFIG_MXS_RTC_WATCHDOG) += mxsrtc_wdt.o
diff --git a/drivers/watchdog/mxsrtc_wdt.c b/drivers/watchdog/mxsrtc_wdt.c
new file mode 100644
index 0000000..33e7663
--- /dev/null
+++ b/drivers/watchdog/mxsrtc_wdt.c
@@ -0,0 +1,23 @@
+#include <common.h>
+#include <asm/io.h>
+#include <watchdog.h>
+#include <asm/arch/imx-regs.h>
+
+#ifdef CONFIG_MXS_RTC_WATCHDOG
+#ifndef CONFIG_WATCHDOG_TIMEOUT_MSECS
+#define CONFIG_WATCHDOG_TIMEOUT_MSECS 60000
+#endif
+void hw_watchdog_reset(void)
+{
+ struct mxs_rtc_regs *rtc_regs = (struct mxs_rtc_regs *)MXS_RTC_BASE;
+ writel(CONFIG_WATCHDOG_TIMEOUT_MSECS, &rtc_regs->hw_rtc_watchdog);
+}
+
+void hw_watchdog_init(void)
+{
+ struct mxs_rtc_regs *rtc_regs = (struct mxs_rtc_regs *)MXS_RTC_BASE;
+
+ hw_watchdog_reset();
+ writel(RTC_CTRL_WATCHDOGEN, &rtc_regs->hw_rtc_watchdog_set);
+}
+#endif
diff --git a/include/configs/mxs.h b/include/configs/mxs.h
index 8bce28f..1f1b87a 100644
--- a/include/configs/mxs.h
+++ b/include/configs/mxs.h
@@ -202,4 +202,8 @@
#define CONFIG_EHCI_IS_TDI
#endif

+#ifdef CONFIG_HW_WATCHDOG
+#define CONFIG_MXS_RTC_WATCHDOG
+#endif
+
#endif /* __CONFIGS_MXS_H__ */
--
1.8.5.3