| // SPDX-License-Identifier: GPL-2.0 |
| * Copyright (C) 2020-2022 Loongson Technology Corporation Limited |
| #include <linux/export.h> |
| #include <asm/processor.h> |
| void __delay(unsigned long cycles) |
| while ((unsigned long)(get_cycles() - t0) < cycles) |
| * Division by multiplication: you don't have to worry about |
| * Use only for very small delays ( < 1 msec). Should probably use a |
| * lookup table, really, as the multiplications take much too long with |
| * short delays. This is a "reasonable" implementation, though (and the |
| * first constant multiplications gets optimized away if the delay is |
| void __udelay(unsigned long us) |
| __delay((us * 0x000010c7ull * HZ * lpj_fine) >> 32); |
| void __ndelay(unsigned long ns) |
| __delay((ns * 0x00000005ull * HZ * lpj_fine) >> 32); |