| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 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 |