projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 22e9b917 RW |
1 | /* |
| 2 | * Copyright (C) 2011 Richard Weinberger <richrd@nod.at> | |
| 3 | * Mostly copied from arch/x86/lib/delay.c | |
| 4 | * | |
| 5 | * This program is free software; you can redistribute it and/or modify | |
| 6 | * it under the terms of the GNU General Public License version 2 as | |
| 7 | * published by the Free Software Foundation. | |
| 8 | */ | |
| 9 | ||
| 060e3522 JD |
10 | #include <linux/module.h> |
| 11 | #include <linux/kernel.h> | |
| 12 | #include <linux/delay.h> | |
| 13 | #include <asm/param.h> | |
| 5fd861b6 | 14 | |
| 22e9b917 | 15 | void __delay(unsigned long loops) |
| 1da177e4 | 16 | { |
| 22e9b917 RW |
17 | asm volatile( |
| 18 | "test %0,%0\n" | |
| 19 | "jz 3f\n" | |
| 20 | "jmp 1f\n" | |
| 21 | ||
| 1da177e4 | 22 | ".align 16\n" |
| 22e9b917 RW |
23 | "1: jmp 2f\n" |
| 24 | ||
| 1da177e4 | 25 | ".align 16\n" |
| 22e9b917 RW |
26 | "2: dec %0\n" |
| 27 | " jnz 2b\n" | |
| 28 | "3: dec %0\n" | |
| 29 | ||
| 30 | : /* we don't need output */ | |
| 31 | : "a" (loops) | |
| 32 | ); | |
| 1da177e4 | 33 | } |
| 22e9b917 | 34 | EXPORT_SYMBOL(__delay); |
| 1da177e4 | 35 | |
| 22e9b917 | 36 | inline void __const_udelay(unsigned long xloops) |
| 5fd861b6 | 37 | { |
| 22e9b917 | 38 | int d0; |
| 5fd861b6 | 39 | |
| 22e9b917 RW |
40 | xloops *= 4; |
| 41 | asm("mull %%edx" | |
| 42 | : "=d" (xloops), "=&a" (d0) | |
| 43 | : "1" (xloops), "0" | |
| 44 | (loops_per_jiffy * (HZ/4))); | |
| 45 | ||
| 46 | __delay(++xloops); | |
| 5fd861b6 | 47 | } |
| 22e9b917 | 48 | EXPORT_SYMBOL(__const_udelay); |
| 5fd861b6 | 49 | |
| 22e9b917 RW |
50 | void __udelay(unsigned long usecs) |
| 51 | { | |
| 52 | __const_udelay(usecs * 0x000010c7); /* 2**32 / 1000000 (rounded up) */ | |
| 53 | } | |
| 060e3522 | 54 | EXPORT_SYMBOL(__udelay); |
| 22e9b917 RW |
55 | |
| 56 | void __ndelay(unsigned long nsecs) | |
| 57 | { | |
| 58 | __const_udelay(nsecs * 0x00005); /* 2**32 / 1000000000 (rounded up) */ | |
| 59 | } | |
| 60 | EXPORT_SYMBOL(__ndelay); |