avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/drivers/watchdog/tegra_wdt.c

@@ -0,0 +1,60 @@
+/*
+ * Copyright 2016 Avionic Design GmbH
+ * Copyright 2016 Julian Scheel <julian@jusst.de>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <watchdog.h>
+#include <asm/io.h>
+#include <asm/arch-tegra/wdt.h>
+#include <asm/arch-tegra/tegra.h>
+
+/* Timeout in seconds */
+#define WDT_TIMEOUT 60
+
+/* Timer to use - 5 is used in linux kernel */
+#define WDT_TIMER_ID 5
+void hw_watchdog_init(void)
+{
+	struct timer_ctrl *timer = (struct timer_ctrl *)NV_PA_TMR5_BASE;
+	struct wdt_ctrl *wdt = (struct wdt_ctrl *)NV_PA_TMRWDT0_BASE;
+	u32 val;
+
+	/* Timer runs fixed at 1 MHz, reset is triggered at 4th timeout of
+	 * timer */
+	val = 1000000ul / 4;
+	val |= (TIMER_PTV_EN | TIMER_PTV_PERIODIC);
+	writel(val, &timer->ptv);
+
+	/* Setup actual wdt */
+	val = WDT_TIMER_ID |
+		((WDT_TIMEOUT << WDT_CFG_PERIOD_SHIFT) & WDT_CFG_PERIOD_MASK) |
+		WDT_CFG_PMC2CAR_RST_EN;
+	writel(val, &wdt->config);
+
+	/* Activate the wdt */
+	writel(WDT_CMD_START_COUNTER, &wdt->command);
+}
+
+void hw_watchdog_reset(void)
+{
+	struct wdt_ctrl *wdt = (struct wdt_ctrl *)NV_PA_TMRWDT0_BASE;
+
+	/* Activate the wdt */
+	writel(WDT_CMD_START_COUNTER, &wdt->command);
+}
+
+void hw_watchdog_disable(void)
+{
+	struct timer_ctrl *timer = (struct timer_ctrl *)NV_PA_TMR5_BASE;
+	struct wdt_ctrl *wdt = (struct wdt_ctrl *)NV_PA_TMRWDT0_BASE;
+
+	/* Write unlock pattern */
+	writel(WDT_UNLOCK_PATTERN, &wdt->unlock);
+	/* Disable wdt */
+	writel(WDT_CMD_DISABLE_COUNTER, &wdt->command);
+	/* Stop timer */
+	writel(0, &timer->ptv);
+}