forked from rrcarlosr/Jetpack
92 lines
2.3 KiB
C
92 lines
2.3 KiB
C
/*
|
|
* Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#ifndef _TIMER_H_
|
|
#define _TIMER_H_
|
|
|
|
/*
|
|
* 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);
|
|
|
|
/*
|
|
* 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);
|
|
|
|
/*
|
|
* Get the current timer count
|
|
*
|
|
* @dev: The timer device
|
|
* @count: pointer that returns the current timer count
|
|
* @return: 0 if OK, -ve on error
|
|
*/
|
|
int timer_get_count(struct udevice *dev, u64 *count);
|
|
|
|
/*
|
|
* Get the timer input clock frequency
|
|
*
|
|
* @dev: The timer device
|
|
* @return: the timer input clock frequency
|
|
*/
|
|
unsigned long timer_get_rate(struct udevice *dev);
|
|
|
|
/*
|
|
* struct timer_ops - Driver model timer operations
|
|
*
|
|
* The uclass interface is implemented by all timer devices which use
|
|
* driver model.
|
|
*/
|
|
struct timer_ops {
|
|
/*
|
|
* Get the current timer count
|
|
*
|
|
* @dev: The timer device
|
|
* @count: pointer that returns the current 64-bit timer count
|
|
* @return: 0 if OK, -ve on error
|
|
*/
|
|
int (*get_count)(struct udevice *dev, u64 *count);
|
|
};
|
|
|
|
/*
|
|
* 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;
|
|
};
|
|
|
|
/**
|
|
* 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);
|
|
|
|
#endif /* _TIMER_H_ */
|