dm: Simple Watchdog uclass
This is a simple uclass for Watchdog Timers. It has four operations:
start, restart, reset, stop. Drivers must implement start, restart and
stop operations, while implementing reset is optional: It's default
implementation expires watchdog timer in one clock tick.
Signed-off-by: Maxim Sloyko <maxims@google.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/watchdog/sandbox_wdt.c b/drivers/watchdog/sandbox_wdt.c
new file mode 100644
index 0000000..34d90be
--- /dev/null
+++ b/drivers/watchdog/sandbox_wdt.c
@@ -0,0 +1,76 @@
+/*
+ * Copyright 2017 Google, Inc
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <asm/state.h>
+#include <wdt.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int sandbox_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
+{
+ struct sandbox_state *state = state_get_current();
+
+ state->wdt.counter = timeout;
+ state->wdt.running = true;
+
+ return 0;
+}
+
+static int sandbox_wdt_stop(struct udevice *dev)
+{
+ struct sandbox_state *state = state_get_current();
+
+ state->wdt.running = false;
+
+ return 0;
+}
+
+static int sandbox_wdt_reset(struct udevice *dev)
+{
+ struct sandbox_state *state = state_get_current();
+
+ state->wdt.reset_count++;
+
+ return 0;
+}
+
+static int sandbox_wdt_expire_now(struct udevice *dev, ulong flags)
+{
+ sandbox_wdt_start(dev, 1, flags);
+
+ return 0;
+}
+
+static int sandbox_wdt_probe(struct udevice *dev)
+{
+ struct sandbox_state *state = state_get_current();
+
+ memset(&state->wdt, 0, sizeof(state->wdt));
+
+ return 0;
+}
+
+static const struct wdt_ops sandbox_wdt_ops = {
+ .start = sandbox_wdt_start,
+ .reset = sandbox_wdt_reset,
+ .stop = sandbox_wdt_stop,
+ .expire_now = sandbox_wdt_expire_now,
+};
+
+static const struct udevice_id sandbox_wdt_ids[] = {
+ { .compatible = "sandbox,wdt" },
+ {}
+};
+
+U_BOOT_DRIVER(wdt_sandbox) = {
+ .name = "wdt_sandbox",
+ .id = UCLASS_WDT,
+ .of_match = sandbox_wdt_ids,
+ .ops = &sandbox_wdt_ops,
+ .probe = sandbox_wdt_probe,
+};