| 1 | // SPDX-License-Identifier: GPL-2.0 |
|---|---|
| 2 | // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. |
| 3 | #include <linux/kernel.h> |
| 4 | #include <linux/module.h> |
| 5 | #include <linux/init.h> |
| 6 | #include <linux/delay.h> |
| 7 | |
| 8 | void __aligned(8) __delay(unsigned long loops) |
| 9 | { |
| 10 | asm volatile ( |
| 11 | "mov r0, r0\n" |
| 12 | "1:declt %0\n" |
| 13 | "bf 1b" |
| 14 | : "=r"(loops) |
| 15 | : "0"(loops)); |
| 16 | } |
| 17 | EXPORT_SYMBOL(__delay); |
| 18 | |
| 19 | void __const_udelay(unsigned long xloops) |
| 20 | { |
| 21 | unsigned long long loops; |
| 22 | |
| 23 | loops = (unsigned long long)xloops * loops_per_jiffy * HZ; |
| 24 | |
| 25 | __delay(loops >> 32); |
| 26 | } |
| 27 | EXPORT_SYMBOL(__const_udelay); |
| 28 | |
| 29 | void __udelay(unsigned long usecs) |
| 30 | { |
| 31 | __const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */ |
| 32 | } |
| 33 | EXPORT_SYMBOL(__udelay); |
| 34 | |
| 35 | void __ndelay(unsigned long nsecs) |
| 36 | { |
| 37 | __const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */ |
| 38 | } |
| 39 | EXPORT_SYMBOL(__ndelay); |
| 40 |