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delay: collect {m, n, u}delay declarations to include/linux/delay.h

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Currently, mdelay() and udelay() are declared in include/common.h,
while ndelay() in include/linux/compat.h.  It would be nice to
collect them into include/linux/delay.h like Linux.

While we are here, fix the ndelay() implementation; I used the
DIV_ROUND_UP() instead of (x)/1000 because it must wait *longer*
than the given period of time.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Masahiro Yamada 2016-12-28 00:35:59 +09:00 • committed by Tom Rini
parent 4b105f6ca9
commit 5bc516ed66
4 changed files with 25 additions and 13 deletions
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24
include/linux/delay.h Normal file
View file

@ -0,0 +1,24 @@
/*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef _LINUX_DELAY_H
#define _LINUX_DELAY_H
#include <linux/kernel.h>
void __udelay(unsigned long usec);
void udelay(unsigned long usec);
static inline void mdelay(unsigned long msec)
{
while (msec--)
udelay(1000);
}
static inline void ndelay(unsigned long nsec)
{
udelay(DIV_ROUND_UP(nsec, 1000));
}
#endif /* defined(_LINUX_DELAY_H) */