forked from luck/tmp_suning_uos_patched
6388d14eb2
Signed-off-by: Barry Song <barry.song@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
52 lines
917 B
C
52 lines
917 B
C
/*
|
|
* delay.h - delay functions
|
|
*
|
|
* Copyright (c) 2004-2007 Analog Devices Inc.
|
|
*
|
|
* Licensed under the GPL-2 or later.
|
|
*/
|
|
|
|
#ifndef __ASM_DELAY_H__
|
|
#define __ASM_DELAY_H__
|
|
|
|
#include <mach/anomaly.h>
|
|
|
|
static inline void __delay(unsigned long loops)
|
|
{
|
|
__asm__ __volatile__ (
|
|
"LSETUP(1f, 1f) LC0 = %0;"
|
|
"1: NOP;"
|
|
:
|
|
: "a" (loops)
|
|
: "LT0", "LB0", "LC0"
|
|
);
|
|
}
|
|
|
|
#include <linux/param.h> /* needed for HZ */
|
|
|
|
/*
|
|
* close approximation borrowed from m68knommu to avoid 64-bit math
|
|
*/
|
|
|
|
#define HZSCALE (268435456 / (1000000/HZ))
|
|
|
|
static inline unsigned long __to_delay(unsigned long scale)
|
|
{
|
|
extern unsigned long loops_per_jiffy;
|
|
return (((scale * HZSCALE) >> 11) * (loops_per_jiffy >> 11)) >> 6;
|
|
}
|
|
|
|
static inline void udelay(unsigned long usecs)
|
|
{
|
|
__delay(__to_delay(usecs));
|
|
}
|
|
|
|
static inline void ndelay(unsigned long nsecs)
|
|
{
|
|
__delay(__to_delay(1) * nsecs / 1000);
|
|
}
|
|
|
|
#define ndelay ndelay
|
|
|
|
#endif
|