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Tracing is typically enabled by the time driver model starts up, so there is no point in adding a 'notrace' to the timer-init function. However, once the driver model timer is enabled, we do need to be able to access the timer's private data when reading the timer, so add it to the core function needed for that. Update the function's documentation while we are here. Signed-off-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
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* @dev: The timer device
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*
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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_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
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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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