brain-hackers_pepepper-mirror/u-boot-brain
1
0
Fork 0
mirror of https://github.com/brain-hackers/u-boot-brain synced 2024-06-09 23:36:03 +09:00
Code Issues Projects Releases Wiki Activity

Exynos: Add timer_get_us function

Browse Source 
timer_get_us returns the time in microseconds since a certain reference
point of history.  However, it does not guarantee to return an accurate
time after a long period; instead, it wraps around (that is, the
reference point is reset to some other point of history) after some
periods. The frequency of wrapping around is about an hour (or 2^32
microseconds).

Test with command "sf probe 1:0; time sf read 40008000 0 1000".
Try with different numbers of bytes and see that sane values are obtained

Signed-off-by: Che-Liang Chiou <clchiou@chromium.org>
Signed-off-by: Akshay Saraswat <akshay.s@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
This commit is contained in:
Che-Liang Chiou 2013-03-28 04:32:17 +00:00 committed by Minkyu Kang
parent 3d00c0cb96
commit f24869d3a8
1 changed files with 15 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
arch/arm/cpu/armv7/s5p-common/timer.c
View File

@ -90,6 +90,21 @@ unsigned long get_timer(unsigned long base)
return gd->arch.timer_reset_value / 1000 - base;
}
unsigned long timer_get_us(void)
{
static unsigned long base_time_us;
struct s5p_timer *const timer =
(struct s5p_timer *)samsung_get_base_timer();
unsigned long now_downward_us = readl(&timer->tcnto4);
if (!base_time_us)
base_time_us = now_downward_us;
/* Note that this timer counts downward. */
return base_time_us - now_downward_us;
}
/* delay x useconds */
void __udelay(unsigned long usec)
{