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To avoid confusion document that timer_dev_priv.clock_rate and timer_get_rate() yield the timer rate in hertz. Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com> Reviewed-by: Simon Glass <sjg@chromium.org>
117 lines
3.5 KiB
C
117 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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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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#ifndef _TIMER_H_
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#define _TIMER_H_
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#define timer_get_ops(dev) ((struct timer_ops *)(dev)->driver->ops)
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/**
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* dm_timer_init() - set up a timer for time keeping
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*
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* Sets up gd->timer if the device is not already bound, making sure it is
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* probed and ready for use
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*
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* On success, inits gd->timer so that lib/timer can use it for future reference
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*
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* Returns: 0 on success, -EAGAIN if driver model is not ready yet, -ENODEV if
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* no timer could be found, other error if the timer could not be bound or
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* probed
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*/
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int dm_timer_init(void);
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/**
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* timer_timebase_fallback() - Helper for timers using timebase fallback
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* @dev: A timer partially-probed timer device
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*
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* This is a helper function designed for timers which need to fall back on the
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* cpu's timebase. This function is designed to be called during the driver's
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* probe(). If there is a clocks or clock-frequency property in the timer's
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* binding, then it will be used. Otherwise, the timebase of the current cpu
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* will be used. This is initialized by the cpu driver, and usually gotten from
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* ``/cpus/timebase-frequency`` or ``/cpus/cpu@X/timebase-frequency``.
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*
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* Return: 0 if OK, or negative error code on failure
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*/
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int timer_timebase_fallback(struct udevice *dev);
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/**
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* timer_conv_64() - convert 32-bit counter value to 64-bit
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* @count: 32-bit counter value
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*
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* Return: 64-bit counter value
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*/
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u64 timer_conv_64(u32 count);
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/**
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* timer_get_count() - Get the current timer count
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* @dev: The timer device
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* @count: pointer that returns the current timer count
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*
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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, u64 *count);
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/**
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* timer_get_rate() - Get the timer input clock frequency in Hz
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* @dev: The timer device
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*
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* Return: the timer input clock frequency in Hz
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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_count: Get the current timer count
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*
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* @dev: The timer device
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*
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* This function may be called at any time after the driver is probed.
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* All necessary initialization must be completed by the time probe()
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* returns. The count returned by this functions should be monotonic.
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* This function must succeed.
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*
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* Return: The current 64-bit timer count
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*/
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u64 (*get_count)(struct udevice *dev);
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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 in Hz
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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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/**
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* timer_early_get_count() - Implement timer_get_count() before driver model
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*
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* If ``CONFIG_TIMER_EARLY`` is enabled, this function wil be called to return
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* the current timer value before the proper driver model timer is ready.
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* It should be implemented by one of the timer values. This is mostly useful
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* for tracing.
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*/
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u64 timer_early_get_count(void);
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/**
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* timer_early_get_rate() - Get the timer rate before driver model
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*
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* If ``CONFIG_TIMER_EARLY`` is enabled, this function wil be called to return
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* the current timer rate in Hz before the proper driver model timer is ready.
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* It should be implemented by one of the timer values. This is mostly useful
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* for tracing. This corresponds to the clock_rate value in struct
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* timer_dev_priv.
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*/
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unsigned long timer_early_get_rate(void);
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#endif /* _TIMER_H_ */
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