| 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 | |
| 11 | void __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 | |
| 20 | void __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 | |
| 30 | void __udelay(unsigned long usecs) |
| 31 | { |
| 32 | __const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */ |
| 33 | } |
| 34 | EXPORT_SYMBOL(__udelay); |
| 35 | |
| 36 | void __ndelay(unsigned long nsecs) |
| 37 | { |
| 38 | __const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */ |
| 39 | } |
| 40 | EXPORT_SYMBOL(__ndelay); |
| 41 |