projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| f27bb139 MZ |
1 | /* |
| 2 | * Delay loops based on the OpenRISC implementation. | |
| 3 | * | |
| 4 | * Copyright (C) 2012 ARM Limited | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License version 2 as | |
| 8 | * published by the Free Software Foundation. | |
| 9 | * | |
| 10 | * This program is distributed in the hope that it will be useful, | |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 | * GNU General Public License for more details. | |
| 14 | * | |
| 15 | * You should have received a copy of the GNU General Public License | |
| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 17 | * | |
| 18 | * Author: Will Deacon <will.deacon@arm.com> | |
| 19 | */ | |
| 20 | ||
| 21 | #include <linux/delay.h> | |
| 22 | #include <linux/init.h> | |
| 23 | #include <linux/kernel.h> | |
| 24 | #include <linux/module.h> | |
| 25 | #include <linux/timex.h> | |
| 26 | ||
| 27 | void __delay(unsigned long cycles) | |
| 28 | { | |
| 29 | cycles_t start = get_cycles(); | |
| 30 | ||
| 31 | while ((get_cycles() - start) < cycles) | |
| 32 | cpu_relax(); | |
| 33 | } | |
| 34 | EXPORT_SYMBOL(__delay); | |
| 35 | ||
| 36 | inline void __const_udelay(unsigned long xloops) | |
| 37 | { | |
| 38 | unsigned long loops; | |
| 39 | ||
| 40 | loops = xloops * loops_per_jiffy * HZ; | |
| 41 | __delay(loops >> 32); | |
| 42 | } | |
| 43 | EXPORT_SYMBOL(__const_udelay); | |
| 44 | ||
| 45 | void __udelay(unsigned long usecs) | |
| 46 | { | |
| 47 | __const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */ | |
| 48 | } | |
| 49 | EXPORT_SYMBOL(__udelay); | |
| 50 | ||
| 51 | void __ndelay(unsigned long nsecs) | |
| 52 | { | |
| 53 | __const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */ | |
| 54 | } | |
| 55 | EXPORT_SYMBOL(__ndelay); |