1 /* 2 * Copyright 2010 Tilera Corporation. All Rights Reserved. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation, version 2. 7 * 8 * This program is distributed in the hope that it will be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 11 * NON INFRINGEMENT. See the GNU General Public License for 12 * more details. 13 */ 14 15 #include <linux/module.h> 16 #include <linux/delay.h> 17 #include <linux/thread_info.h> 18 #include <asm/timex.h> 19 __udelay(unsigned long usecs)20void __udelay(unsigned long usecs) 21 { 22 if (usecs > ULONG_MAX / 1000) { 23 WARN_ON_ONCE(usecs > ULONG_MAX / 1000); 24 usecs = ULONG_MAX / 1000; 25 } 26 __ndelay(usecs * 1000); 27 } 28 EXPORT_SYMBOL(__udelay); 29 __ndelay(unsigned long nsecs)30void __ndelay(unsigned long nsecs) 31 { 32 cycles_t target = get_cycles(); 33 target += ns2cycles(nsecs); 34 while (get_cycles() < target) 35 cpu_relax(); 36 } 37 EXPORT_SYMBOL(__ndelay); 38 __delay(unsigned long cycles)39void __delay(unsigned long cycles) 40 { 41 cycles_t target = get_cycles() + cycles; 42 while (get_cycles() < target) 43 cpu_relax(); 44 } 45 EXPORT_SYMBOL(__delay); 46