projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 | 1 | /* |
| a23ba435 | 2 | * arch/sh/lib64/udelay.c |
| 1da177e4 LT |
3 | * |
| 4 | * Delay routines, using a pre-computed "loops_per_jiffy" value. | |
| 5 | * | |
| 6 | * Copyright (C) 2000, 2001 Paolo Alberelli | |
| 7 | * Copyright (C) 2003, 2004 Paul Mundt | |
| 8 | * | |
| 9 | * This file is subject to the terms and conditions of the GNU General Public | |
| 10 | * License. See the file "COPYING" in the main directory of this archive | |
| 11 | * for more details. | |
| 12 | */ | |
| 1da177e4 LT |
13 | #include <linux/sched.h> |
| 14 | #include <asm/param.h> | |
| 15 | ||
| 1da177e4 LT |
16 | /* |
| 17 | * Use only for very small delays (< 1 msec). | |
| 18 | * | |
| 19 | * The active part of our cycle counter is only 32-bits wide, and | |
| 20 | * we're treating the difference between two marks as signed. On | |
| 21 | * a 1GHz box, that's about 2 seconds. | |
| 22 | */ | |
| 23 | ||
| 7b9726a7 | 24 | void __delay(unsigned long loops) |
| 1da177e4 LT |
25 | { |
| 26 | long long dummy; | |
| 27 | __asm__ __volatile__("gettr tr0, %1\n\t" | |
| 28 | "pta $+4, tr0\n\t" | |
| 29 | "addi %0, -1, %0\n\t" | |
| 30 | "bne %0, r63, tr0\n\t" | |
| 31 | "ptabs %1, tr0\n\t":"=r"(loops), | |
| 32 | "=r"(dummy) | |
| 33 | :"0"(loops)); | |
| 34 | } | |
| 35 | ||
| ef9f8999 | 36 | void __const_udelay(unsigned long xloops) |
| 1da177e4 | 37 | { |
| 7b9726a7 | 38 | __delay(xloops * (HZ * cpu_data[raw_smp_processor_id()].loops_per_jiffy)); |
| 1da177e4 LT |
39 | } |
| 40 | ||
| 7b9726a7 | 41 | void __udelay(unsigned long usecs) |
| 1da177e4 | 42 | { |
| 7b9726a7 | 43 | __const_udelay(usecs * 0x000010c6); /* 2**32 / 1000000 */ |
| 1da177e4 LT |
44 | } |
| 45 | ||
| 7b9726a7 | 46 | void __ndelay(unsigned long nsecs) |
| 1da177e4 | 47 | { |
| 7b9726a7 | 48 | __const_udelay(nsecs * 0x00000005); |
| 1da177e4 | 49 | } |