projects / mirror_ubuntu-hirsute-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 7f9ea6b7 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 5c86fa7f GH |
2 | // Copyright (C) 2005-2017 Andes Technology Corporation |
| 3 | ||
| 4 | #ifndef __NDS32_DELAY_H__ | |
| 5 | #define __NDS32_DELAY_H__ | |
| 6 | ||
| 7 | #include <asm/param.h> | |
| 8 | ||
| 9 | /* There is no clocksource cycle counter in the CPU. */ | |
| 10 | static inline void __delay(unsigned long loops) | |
| 11 | { | |
| 12 | __asm__ __volatile__(".align 2\n" | |
| 13 | "1:\n" | |
| 14 | "\taddi\t%0, %0, -1\n" | |
| 15 | "\tbgtz\t%0, 1b\n" | |
| 16 | :"=r"(loops) | |
| 17 | :"0"(loops)); | |
| 18 | } | |
| 19 | ||
| 20 | static inline void __udelay(unsigned long usecs, unsigned long lpj) | |
| 21 | { | |
| 22 | usecs *= (unsigned long)(((0x8000000000000000ULL / (500000 / HZ)) + | |
| 23 | 0x80000000ULL) >> 32); | |
| 24 | usecs = (unsigned long)(((unsigned long long)usecs * lpj) >> 32); | |
| 25 | __delay(usecs); | |
| 26 | } | |
| 27 | ||
| 28 | #define udelay(usecs) __udelay((usecs), loops_per_jiffy) | |
| 29 | ||
| 30 | /* make sure "usecs *= ..." in udelay do not overflow. */ | |
| 31 | #if HZ >= 1000 | |
| 32 | #define MAX_UDELAY_MS 1 | |
| 33 | #elif HZ <= 200 | |
| 34 | #define MAX_UDELAY_MS 5 | |
| 35 | #else | |
| 36 | #define MAX_UDELAY_MS (1000 / HZ) | |
| 37 | #endif | |
| 38 | ||
| 39 | #endif |