1/* delay.h: FRV delay code
 2 *
 3 * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
 4 * Written by David Howells (dhowells@redhat.com)
 5 *
 6 * This program is free software; you can redistribute it and/or
 7 * modify it under the terms of the GNU General Public License
 8 * as published by the Free Software Foundation; either version
 9 * 2 of the License, or (at your option) any later version.
10 */
11
12#ifndef _ASM_DELAY_H
13#define _ASM_DELAY_H
14
15#include <asm/param.h>
16#include <asm/timer-regs.h>
17
18/*
19 * delay loop - runs at __core_clock_speed_HZ / 2 [there are 2 insns in the loop]
20 */
21extern unsigned long __delay_loops_MHz;
22
23static inline void __delay(unsigned long loops)
24{
25	asm volatile("1:	subicc	%0,#1,%0,icc0	\n"
26		     "		bnc	icc0,#2,1b	\n"
27		     : "=r" (loops)
28		     : "0" (loops)
29		     : "icc0"
30		     );
31}
32
33/*
34 * Use only for very small delays ( < 1 msec).  Should probably use a
35 * lookup table, really, as the multiplications take much too long with
36 * short delays.  This is a "reasonable" implementation, though (and the
37 * first constant multiplications gets optimized away if the delay is
38 * a constant)
39 */
40
41extern unsigned long loops_per_jiffy;
42
43static inline void udelay(unsigned long usecs)
44{
45	__delay(usecs * __delay_loops_MHz);
46}
47
48#define ndelay(n)	udelay((n) * 5)
49
50#endif /* _ASM_DELAY_H */