Add a sound driver which can output simple beeps using this legacy timer.
Signed-off-by: Simon Glass <s...@chromium.org>
---
Changes in v2:
- Change the driver name to i8254_drv
drivers/sound/Kconfig | 12 ++++++++++++
drivers/sound/Makefile | 1 +
drivers/sound/i8254_beep.c | 38 ++++++++++++++++++++++++++++++++++++++
3 files changed, 51 insertions(+)
create mode 100644 drivers/sound/i8254_beep.c
diff --git a/drivers/sound/Kconfig b/drivers/sound/Kconfig
index 4b893f035b0..c1847df07fa 100644
--- a/drivers/sound/Kconfig
+++ b/drivers/sound/Kconfig
@@ -40,6 +40,18 @@ config I2S_SAMSUNG
option provides an implementation for sound_init() and
sound_play().
+config SOUND_I8254
+ bool "Intel i8254 timer / beeper"
+ depends on SOUND
+ help
+ This enables support for a beeper that uses the i8254 timer chip.
+ This can emit beeps at a fixed frequency. It is possible to control
+ the length of the beeps, by turning a beep on, waiting for a period
+ of time, then turning it off.
+
+ This is quite an old feature, called PIT (Programmable Interval
+ Timer), but is nonetheless still available on modern x86 machines.
+
config SOUND_INTEL_HDA
bool "Intel HDA audio codec"
depends on SOUND
diff --git a/drivers/sound/Makefile b/drivers/sound/Makefile
index 771c1165167..2a6fd7420c2 100644
--- a/drivers/sound/Makefile
+++ b/drivers/sound/Makefile
@@ -16,4 +16,5 @@ obj-$(CONFIG_SOUND_MAX98088) += max98088.o maxim_codec.o
obj-$(CONFIG_SOUND_MAX98090) += max98090.o maxim_codec.o
obj-$(CONFIG_SOUND_MAX98095) += max98095.o maxim_codec.o
obj-$(CONFIG_SOUND_INTEL_HDA) += hda_codec.o
+obj-$(CONFIG_SOUND_I8254) += i8254_beep.o
obj-$(CONFIG_SOUND_IVYBRIDGE) += ivybridge_sound.o
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,
+};
--
2.21.0.rc0.258.g878e2cd30e-goog
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