1 files changed, 79 insertions, 0 deletions
diff --git a/drivers/watchdog/sandbox_alarm-wdt.c b/drivers/watchdog/sandbox_alarm-wdt.c
new file mode 100644
index 0000000000..71bb5d924e
--- /dev/null
+++ b/drivers/watchdog/sandbox_alarm-wdt.c
@@ -0,0 +1,79 @@
+#include <common.h>
+#include <dm.h>
+#include <os.h>
+#include <wdt.h>
+
+struct alarm_wdt_priv {
+	unsigned int timeout_sec;
+};
+
+static void alarm_handler(int sig)
+{
+	const char *msg = "!!! ALARM !!!\n";
+
+	os_write(2, msg, strlen(msg));
+	os_fd_restore();
+	os_set_alarm_handler(NULL);
+	os_raise_sigalrm();
+}
+
+static int alarm_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
+{
+	struct alarm_wdt_priv *priv = dev_get_priv(dev);
+	unsigned int sec;
+
+	timeout = DIV_ROUND_UP(timeout, 1000);
+	sec = min_t(u64, UINT_MAX, timeout);
+	priv->timeout_sec = sec;
+
+	os_alarm(0);
+	os_set_alarm_handler(alarm_handler);
+	os_alarm(sec);
+
+	return 0;
+}
+
+static int alarm_wdt_stop(struct udevice *dev)
+{
+	os_alarm(0);
+	os_set_alarm_handler(NULL);
+
+	return 0;
+}
+
+static int alarm_wdt_reset(struct udevice *dev)
+{
+	struct alarm_wdt_priv *priv = dev_get_priv(dev);
+
+	os_alarm(priv->timeout_sec);
+
+	return 0;
+}
+
+static int alarm_wdt_expire_now(struct udevice *dev, ulong flags)
+{
+	alarm_handler(0);
+
+	return 0;
+}
+
+
+static const struct wdt_ops alarm_wdt_ops = {
+	.start = alarm_wdt_start,
+	.reset = alarm_wdt_reset,
+	.stop = alarm_wdt_stop,
+	.expire_now = alarm_wdt_expire_now,
+};
+
+static const struct udevice_id alarm_wdt_ids[] = {
+	{ .compatible = "sandbox,alarm-wdt" },
+	{}
+};
+
+U_BOOT_DRIVER(alarm_wdt_sandbox) = {
+	.name = "alarm_wdt_sandbox",
+	.id = UCLASS_WDT,
+	.of_match = alarm_wdt_ids,
+	.ops = &alarm_wdt_ops,
+	.priv_auto = sizeof(struct alarm_wdt_priv),
+};