Implement a Timer uclass to work with lib/time.c. Signed-off-by: Thomas Chou <thomas@wytron.com.tw> Acked-by: Simon Glass <sjg@chromium.org>master
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menu "Timer Support" |
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config TIMER |
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bool "Enable Driver Model for Timer drivers" |
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depends on DM |
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help |
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Enable driver model for Timer access. It uses the same API as |
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lib/time.c. But now implemented by the uclass. The first timer |
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will be used. The timer is usually a 32 bits free-running up |
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counter. There may be no real tick, and no timer interrupt. |
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endmenu |
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#
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# Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
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#
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# SPDX-License-Identifier: GPL-2.0+
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#
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obj-$(CONFIG_TIMER) += timer-uclass.o
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/*
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* Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw> |
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* |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/ |
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#include <common.h> |
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#include <dm.h> |
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#include <errno.h> |
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#include <timer.h> |
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/*
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* Implement a Timer uclass to work with lib/time.c. The timer is usually |
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* a 32 bits free-running up counter. The get_rate() method is used to get |
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* the input clock frequency of the timer. The get_count() method is used |
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* get the current 32 bits count value. If the hardware is counting down, |
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* the value should be inversed inside the method. There may be no real |
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* tick, and no timer interrupt. |
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*/ |
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int timer_get_count(struct udevice *dev, unsigned long *count) |
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{ |
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const struct timer_ops *ops = device_get_ops(dev); |
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if (!ops->get_count) |
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return -ENOSYS; |
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return ops->get_count(dev, count); |
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} |
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unsigned long timer_get_rate(struct udevice *dev) |
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{ |
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struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev); |
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return uc_priv->clock_rate; |
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} |
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UCLASS_DRIVER(timer) = { |
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.id = UCLASS_TIMER, |
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.name = "timer", |
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.per_device_auto_alloc_size = sizeof(struct timer_dev_priv), |
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}; |
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/*
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* Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw> |
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* |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/ |
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#ifndef _TIMER_H_ |
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#define _TIMER_H_ |
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/*
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* Get the current timer count |
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* |
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* @dev: The Timer device |
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* @count: pointer that returns the current timer count |
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* @return: 0 if OK, -ve on error |
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*/ |
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int timer_get_count(struct udevice *dev, unsigned long *count); |
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/*
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* Get the timer input clock frequency |
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* |
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* @dev: The Timer device |
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* @return: the timer input clock frequency |
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*/ |
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unsigned long timer_get_rate(struct udevice *dev); |
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/*
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* struct timer_ops - Driver model Timer operations |
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* |
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* The uclass interface is implemented by all Timer devices which use |
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* driver model. |
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*/ |
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struct timer_ops { |
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/*
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* Get the current timer count |
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* |
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* @dev: The Timer device |
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* @count: pointer that returns the current timer count |
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* @return: 0 if OK, -ve on error |
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*/ |
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int (*get_count)(struct udevice *dev, unsigned long *count); |
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}; |
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/*
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* struct timer_dev_priv - information about a device used by the uclass |
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* |
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* @clock_rate: the timer input clock frequency |
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*/ |
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struct timer_dev_priv { |
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unsigned long clock_rate; |
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}; |
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#endif /* _TIMER_H_ */ |
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