blob: 33f9018b48a23282b404949bd12e0c1a10b96e00 [file] [log] [blame]
#ifndef _CRIS_DELAY_H
#define _CRIS_DELAY_H
/*
* Copyright (C) 1998, 1999, 2000, 2001 Axis Communications AB
*
* Delay routines, using a pre-computed "loops_per_second" value.
*/
#include <linux/config.h>
#include <linux/linkage.h>
#ifdef CONFIG_SMP
#include <asm/smp.h>
#endif
extern void __do_delay(void); /* Special register call calling convention */
extern __inline__ void __delay(int loops)
{
__asm__ __volatile__ (
"move.d %0,$r9\n\t"
"beq 2f\n\t"
"subq 1,$r9\n\t"
"1:\n\t"
"bne 1b\n\t"
"subq 1,$r9\n"
"2:"
: : "g" (loops) : "r9");
}
/* Use only for very small delays ( < 1 msec). */
extern unsigned long loops_per_usec; /* arch/cris/mm/init.c */
extern __inline__ void udelay(unsigned long usecs)
{
__delay(usecs * loops_per_usec);
}
/* ETRAX 100 is really too slow to sleep for nanosecs. */
/* Divide with 1024 to avoid a real division that would take >1 us... */
extern __inline__ void ndelay(unsigned long nsecs)
{
__delay(1 + nsecs * loops_per_usec / 1024);
}
#endif /* defined(_CRIS_DELAY_H) */