projects / deliverable / linux.git / blame
| 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 | { | |
| 24 | __asm__("dmulu.l %0, %2\n\t" | |
| 25 | "sts mach, %0" | |
| 26 | : "=r" (xloops) | |
| c71861e6 | 27 | : "0" (xloops), |
| 28 | "r" (HZ * cpu_data[raw_smp_processor_id()].loops_per_jiffy) | |
| 1da177e4 | 29 | : "macl", "mach"); |
| c71861e6 | 30 | __delay(xloops); |
| 1da177e4 LT |
31 | } |
| 32 | ||
| 33 | void __udelay(unsigned long usecs) | |
| 34 | { | |
| 35 | __const_udelay(usecs * 0x000010c6); /* 2**32 / 1000000 */ | |
| 36 | } | |
| 37 | ||
| 38 | void __ndelay(unsigned long nsecs) | |
| 39 | { | |
| 40 | __const_udelay(nsecs * 0x00000005); | |
| 41 | } | |
| 42 |