Add a sound driver which can output simple beeps using this legacy timer.
Signed-off-by: Simon Glass sjg@chromium.org ---
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 a414e8e712..36b329d016 100644 --- a/drivers/sound/Kconfig +++ b/drivers/sound/Kconfig @@ -31,6 +31,18 @@ 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 23893947be..f01fb2f739 100644 --- a/drivers/sound/Makefile +++ b/drivers/sound/Makefile @@ -15,4 +15,5 @@ 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 0000000000..c65ed268cf --- /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 = "bd82x6x", + .id = UCLASS_SOUND, + .of_match = i8254_ids, + .ops = &i8254_ops, +};