1/*
2 * arch/sh/lib64/udelay.c
3 *
4 * Delay routines, using a pre-computed "loops_per_jiffy" value.
5 *
6 * Copyright (C) 2000, 2001  Paolo Alberelli
7 * Copyright (C) 2003, 2004  Paul Mundt
8 *
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License.  See the file "COPYING" in the main directory of this archive
11 * for more details.
12 */
13#include <linux/sched.h>
14#include <asm/param.h>
15
16/*
17 * Use only for very small delays (< 1 msec).
18 *
19 * The active part of our cycle counter is only 32-bits wide, and
20 * we're treating the difference between two marks as signed.  On
21 * a 1GHz box, that's about 2 seconds.
22 */
23
24void __delay(unsigned long loops)
25{
26	long long dummy;
27	__asm__ __volatile__("gettr	tr0, %1\n\t"
28			     "pta	$+4, tr0\n\t"
29			     "addi	%0, -1, %0\n\t"
30			     "bne	%0, r63, tr0\n\t"
31			     "ptabs	%1, tr0\n\t":"=r"(loops),
32			     "=r"(dummy)
33			     :"0"(loops));
34}
35
36void __const_udelay(unsigned long xloops)
37{
38	__delay(xloops * (HZ * cpu_data[raw_smp_processor_id()].loops_per_jiffy));
39}
40
41void __udelay(unsigned long usecs)
42{
43	__const_udelay(usecs * 0x000010c6);  /* 2**32 / 1000000 */
44}
45
46void __ndelay(unsigned long nsecs)
47{
48	__const_udelay(nsecs * 0x00000005);
49}
50