diff options
| author | Simon Glass | 2016-02-24 09:14:49 -0700 |
|---|---|---|
| committer | Simon Glass | 2016-02-26 08:53:10 -0700 |
| commit | c95fec31928d7e2596364ee1d226b52ffd7793f2 (patch) | |
| tree | 07972d661c4ce017dbaa2d5e8ce488717aed6cdd /include | |
| parent | 4f051824b5c2a6bf8d3114c772676977fb95969a (diff) | |
timer: Provide an early timer
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/timer.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/include/timer.h b/include/timer.h index f14725cc280..dcc803c392a 100644 --- a/include/timer.h +++ b/include/timer.h @@ -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_ */ |