Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | ||
10 | void __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 | ||
22 | inline void __const_udelay(unsigned long xloops) | |
23 | { | |
bd4fb4d4 | 24 | xloops *= 4; |
1da177e4 LT |
25 | __asm__("dmulu.l %0, %2\n\t" |
26 | "sts mach, %0" | |
27 | : "=r" (xloops) | |
c71861e6 | 28 | : "0" (xloops), |
bd4fb4d4 | 29 | "r" (cpu_data[raw_smp_processor_id()].loops_per_jiffy * (HZ/4)) |
1da177e4 | 30 | : "macl", "mach"); |
bd4fb4d4 | 31 | __delay(++xloops); |
1da177e4 LT |
32 | } |
33 | ||
34 | void __udelay(unsigned long usecs) | |
35 | { | |
36 | __const_udelay(usecs * 0x000010c6); /* 2**32 / 1000000 */ | |
37 | } | |
38 | ||
39 | void __ndelay(unsigned long nsecs) | |
40 | { | |
41 | __const_udelay(nsecs * 0x00000005); | |
42 | } | |
43 |