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include/timer.h
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/* SPDX-License-Identifier: GPL-2.0+ */ |
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/* * Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw> |
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*/ #ifndef _TIMER_H_ #define _TIMER_H_ /* |
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* dm_timer_init - initialize a timer for time keeping. On success * initializes gd->timer so that lib/timer can use it for future * referrence. * * @return - 0 on success or error number */ int dm_timer_init(void); /* |
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* timer_conv_64 - convert 32-bit counter value to 64-bit * * @count: 32-bit counter value * @return: 64-bit counter value */ u64 timer_conv_64(u32 count); /* |
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* 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 * @return: 0 if OK, -ve on error */ |
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int timer_get_count(struct udevice *dev, u64 *count); |
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/* * Get the timer input clock frequency * |
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* @dev: The timer device |
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* @return: the timer input clock frequency */ unsigned long timer_get_rate(struct udevice *dev); /* |
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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. */ struct timer_ops { /* * Get the current timer count * |
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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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int (*get_count)(struct udevice *dev, u64 *count); |
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}; /* * struct timer_dev_priv - information about a device used by the uclass * * @clock_rate: the timer input clock frequency */ struct timer_dev_priv { unsigned long clock_rate; }; |
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/** * timer_early_get_count() - Implement timer_get_count() before driver model * * If CONFIG_TIMER_EARLY is enabled, this function wil be called to return * the current timer value before the proper driver model timer is ready. * It should be implemented by one of the timer values. This is mostly useful * for tracing. */ u64 timer_early_get_count(void); /** * timer_early_get_rate() - Get the timer rate before driver model * * If CONFIG_TIMER_EARLY is enabled, this function wil be called to return * the current timer rate in Hz before the proper driver model timer is ready. * It should be implemented by one of the timer values. This is mostly useful * for tracing. This corresponds to the clock_rate value in struct * timer_dev_priv. */ unsigned long timer_early_get_rate(void); |
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#endif /* _TIMER_H_ */ |