1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Copyright Altera Corporation (C) 2014. All rights reserved. 3 */ 4 5 #include <linux/module.h> 6 #include <asm/delay.h> 7 #include <asm/param.h> 8 #include <asm/processor.h> 9 #include <asm/timex.h> 10 __delay(unsigned long cycles)11void __delay(unsigned long cycles) 12 { 13 cycles_t start = get_cycles(); 14 15 while ((get_cycles() - start) < cycles) 16 cpu_relax(); 17 } 18 EXPORT_SYMBOL(__delay); 19 __const_udelay(unsigned long xloops)20void __const_udelay(unsigned long xloops) 21 { 22 u64 loops; 23 24 loops = (u64)xloops * loops_per_jiffy * HZ; 25 26 __delay(loops >> 32); 27 } 28 EXPORT_SYMBOL(__const_udelay); 29 __udelay(unsigned long usecs)30void __udelay(unsigned long usecs) 31 { 32 __const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */ 33 } 34 EXPORT_SYMBOL(__udelay); 35 __ndelay(unsigned long nsecs)36void __ndelay(unsigned long nsecs) 37 { 38 __const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */ 39 } 40 EXPORT_SYMBOL(__ndelay); 41