sound: Add a driver for the i8254 beep

Add a sound driver which can output simple beeps using this legacy timer.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/drivers/sound/i8254_beep.c b/drivers/sound/i8254_beep.c
new file mode 100644
index 00000000000..5572dc4d265
--- /dev/null
+++ b/drivers/sound/i8254_beep.c
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2018 Google LLC
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <sound.h>
+#include <asm/i8254.h>
+
+int i8254_start_beep(struct udevice *dev, int frequency_hz)
+{
+	return i8254_enable_beep(frequency_hz);
+}
+
+int i8254_stop_beep(struct udevice *dev)
+{
+	i8254_disable_beep();
+
+	return 0;
+}
+
+static const struct sound_ops i8254_ops = {
+	.start_beep	= i8254_start_beep,
+	.stop_beep	= i8254_stop_beep,
+};
+
+static const struct udevice_id i8254_ids[] = {
+	{ .compatible = "i8254,beeper" },
+	{ }
+};
+
+U_BOOT_DRIVER(i8254_drv) = {
+	.name		= "i8254_drv",
+	.id		= UCLASS_SOUND,
+	.of_match	= i8254_ids,
+	.ops		= &i8254_ops,
+};