91 lines
2.3 KiB
C
91 lines
2.3 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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/*
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* dm_timer_init - initialize a timer for time keeping. On success
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* initializes gd->timer so that lib/timer can use it for future
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* referrence.
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*
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* @return - 0 on success or error number
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*/
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int dm_timer_init(void);
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/*
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* timer_conv_64 - convert 32-bit counter value to 64-bit
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*
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* @count: 32-bit counter value
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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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* 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, u64 *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 64-bit 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, u64 *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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/**
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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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