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* time: import time_after, time_before and friends from LinuxMasahiro Yamada2017-01-14-0/+41
| | | | | | | | | | | | | | | | | It is not safe to compare timer values directly. On 32-bit systems, for example, timer_get_us() wraps around every 72 min. (2 ^ 32 / 1000000 =~ 4295 sec =~ 72 min). Depending on the get_ticks() implementation, it may wrap more frequently. The 72 min might be possible on the use of U-Boot. Let's borrow time_after, time_before, and friends to solve the wrap-around problem. These macros were copied from include/linux/jiffies.h of Linux 4.9. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Simon Glass <sjg@chromium.org>
* time: move timer APIs to include/time.hMasahiro Yamada2017-01-14-0/+16
The include/common.h is a collection of unrelated declarations, macros, etc. It is horrible to include such a cluttered header just for some timer functions. Split out timer functions into include/time.h. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Simon Glass <sjg@chromium.org>