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timer: Provide an early timer

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In some cases the timer must be accessible before driver model is active.
Examples include when using CONFIG_TRACE to trace U-Boot's execution before
driver model is set up. Enable this option to use an early timer. These
functions must be supported by your timer driver: timer_early_get_count()
and timer_early_get_rate().

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2016-02-24 09:14:49 -07:00
parent 4f051824b5
commit c95fec3192
3 changed files with 52 additions and 7 deletions
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21
include/timer.h
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@@ -67,4 +67,25 @@ 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_ */