Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * Precise Delay Loops for SuperH
3 *
4 * Copyright (C) 1999 Niibe Yutaka & Kaz Kojima
5 */
6
7#include <linux/sched.h>
8#include <linux/delay.h>
9
10void __delay(unsigned long loops)
11{
12 __asm__ __volatile__(
13 "tst %0, %0\n\t"
14 "1:\t"
15 "bf/s 1b\n\t"
16 " dt %0"
17 : "=r" (loops)
18 : "0" (loops)
19 : "t");
20}
21
22inline void __const_udelay(unsigned long xloops)
23{
24 __asm__("dmulu.l %0, %2\n\t"
25 "sts mach, %0"
26 : "=r" (xloops)
27 : "0" (xloops), "r" (cpu_data[raw_smp_processor_id()].loops_per_jiffy)
28 : "macl", "mach");
29 __delay(xloops * HZ);
30}
31
32void __udelay(unsigned long usecs)
33{
34 __const_udelay(usecs * 0x000010c6); /* 2**32 / 1000000 */
35}
36
37void __ndelay(unsigned long nsecs)
38{
39 __const_udelay(nsecs * 0x00000005);
40}
41