1#ifndef _PARISC_DELAY_H
2#define _PARISC_DELAY_H
3
4#include <asm/special_insns.h>    /* for mfctl() */
5#include <asm/processor.h> /* for boot_cpu_data */
6
7
8/*
9 * Copyright (C) 1993 Linus Torvalds
10 *
11 * Delay routines
12 */
13
14static __inline__ void __delay(unsigned long loops) {
15	asm volatile(
16	"	.balignl	64,0x34000034\n"
17	"	addib,UV -1,%0,.\n"
18	"	nop\n"
19		: "=r" (loops) : "0" (loops));
20}
21
22static __inline__ void __cr16_delay(unsigned long clocks) {
23	unsigned long start;
24
25	/*
26	 * Note: Due to unsigned math, cr16 rollovers shouldn't be
27	 * a problem here. However, on 32 bit, we need to make sure
28	 * we don't pass in too big a value. The current default
29	 * value of MAX_UDELAY_MS should help prevent this.
30	 */
31
32	start = mfctl(16);
33	while ((mfctl(16) - start) < clocks)
34	    ;
35}
36
37static __inline__ void __udelay(unsigned long usecs) {
38	__cr16_delay(usecs * ((unsigned long)boot_cpu_data.cpu_hz / 1000000UL));
39}
40
41#define udelay(n) __udelay(n)
42
43#endif /* defined(_PARISC_DELAY_H) */
44