From c8a7ba9e6a5fe2fc7b4a7894829aa0b0148b4d40 Mon Sep 17 00:00:00 2001 From: Thomas Chou Date: Fri, 9 Oct 2015 13:46:34 +0800 Subject: dm: implement a Timer uclass Implement a Timer uclass to work with lib/time.c. Signed-off-by: Thomas Chou Acked-by: Simon Glass --- drivers/timer/Kconfig | 12 ++++++++++++ drivers/timer/Makefile | 7 +++++++ drivers/timer/timer-uclass.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 61 insertions(+) create mode 100644 drivers/timer/Kconfig create mode 100644 drivers/timer/Makefile create mode 100644 drivers/timer/timer-uclass.c (limited to 'drivers/timer') diff --git a/drivers/timer/Kconfig b/drivers/timer/Kconfig new file mode 100644 index 0000000..8e8d600 --- /dev/null +++ b/drivers/timer/Kconfig @@ -0,0 +1,12 @@ +menu "Timer Support" + +config TIMER + bool "Enable Driver Model for Timer drivers" + depends on DM + help + Enable driver model for Timer access. It uses the same API as + lib/time.c. But now implemented by the uclass. The first timer + will be used. The timer is usually a 32 bits free-running up + counter. There may be no real tick, and no timer interrupt. + +endmenu diff --git a/drivers/timer/Makefile b/drivers/timer/Makefile new file mode 100644 index 0000000..afb0009 --- /dev/null +++ b/drivers/timer/Makefile @@ -0,0 +1,7 @@ +# +# Copyright (C) 2015 Thomas Chou +# +# SPDX-License-Identifier: GPL-2.0+ +# + +obj-$(CONFIG_TIMER) += timer-uclass.o diff --git a/drivers/timer/timer-uclass.c b/drivers/timer/timer-uclass.c new file mode 100644 index 0000000..12aee5b --- /dev/null +++ b/drivers/timer/timer-uclass.c @@ -0,0 +1,42 @@ +/* + * Copyright (C) 2015 Thomas Chou + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include +#include +#include +#include + +/* + * Implement a Timer uclass to work with lib/time.c. The timer is usually + * a 32 bits free-running up counter. The get_rate() method is used to get + * the input clock frequency of the timer. The get_count() method is used + * get the current 32 bits count value. If the hardware is counting down, + * the value should be inversed inside the method. There may be no real + * tick, and no timer interrupt. + */ + +int timer_get_count(struct udevice *dev, unsigned long *count) +{ + const struct timer_ops *ops = device_get_ops(dev); + + if (!ops->get_count) + return -ENOSYS; + + return ops->get_count(dev, count); +} + +unsigned long timer_get_rate(struct udevice *dev) +{ + struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev); + + return uc_priv->clock_rate; +} + +UCLASS_DRIVER(timer) = { + .id = UCLASS_TIMER, + .name = "timer", + .per_device_auto_alloc_size = sizeof(struct timer_dev_priv), +}; -- cgit v1.1