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clock: Add a variable with the first timestamp after startup 

For measuring the startup time it's useful to save the first
timestamp after the clocksource has been registered.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2014-09-30 08:25:55 +02:00
parent b1536a3298
commit 96cae61eba
2 changed files with 10 additions and 0 deletions
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8
common/clock.c
View File

@ -29,6 +29,12 @@
static struct clocksource *current_clock; static struct clocksource *current_clock;
static uint64_t time_ns; static uint64_t time_ns;
/*
* The first timestamp when the clocksource is registered.
* Useful for measuring the time spent in barebox.
*/
uint64_t time_beginning;
/** /**
* get_time_ns - get current timestamp in nanoseconds * get_time_ns - get current timestamp in nanoseconds
*/ */
@ -180,5 +186,7 @@ EXPORT_SYMBOL(mdelay);
int init_clock(struct clocksource *cs) int init_clock(struct clocksource *cs)
{ {
current_clock = cs; current_clock = cs;
time_beginning = get_time_ns();
return 0; return 0;
} }

2
include/clock.h
View File

@ -43,6 +43,8 @@ void mdelay(unsigned long msecs);
#define MSECOND ((uint64_t)(1000 * 1000)) #define MSECOND ((uint64_t)(1000 * 1000))
#define USECOND ((uint64_t)(1000)) #define USECOND ((uint64_t)(1000))
extern uint64_t time_beginning;
/* /*
* Convenience wrapper to implement a typical polling loop with * Convenience wrapper to implement a typical polling loop with
* timeout. returns 0 if the condition became true within the * timeout. returns 0 if the condition became true within the