| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * delay loops |
| * |
| * Copyright (C) 2015 Yoshinori Sato |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/delay.h> |
| #include <asm/param.h> |
| #include <asm/processor.h> |
| #include <asm/timex.h> |
| |
| void __delay(unsigned long cycles) |
| { |
| __asm__ volatile ("1: dec.l #1,%0\n\t" |
| "bne 1b":"=r"(cycles):"0"(cycles)); |
| } |
| EXPORT_SYMBOL(__delay); |
| |
| void __const_udelay(unsigned long xloops) |
| { |
| u64 loops; |
| |
| loops = (u64)xloops * loops_per_jiffy * HZ; |
| |
| __delay(loops >> 32); |
| } |
| EXPORT_SYMBOL(__const_udelay); |
| |
| void __udelay(unsigned long usecs) |
| { |
| __const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */ |
| } |
| EXPORT_SYMBOL(__udelay); |
| |
| void __ndelay(unsigned long nsecs) |
| { |
| __const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */ |
| } |
| EXPORT_SYMBOL(__ndelay); |