| /* SPDX-License-Identifier: GPL-2.0 */ |
| // Copyright (C) 2005-2017 Andes Technology Corporation |
| |
| #ifndef __NDS32_DELAY_H__ |
| #define __NDS32_DELAY_H__ |
| |
| #include <asm/param.h> |
| |
| /* There is no clocksource cycle counter in the CPU. */ |
| static inline void __delay(unsigned long loops) |
| { |
| __asm__ __volatile__(".align 2\n" |
| "1:\n" |
| "\taddi\t%0, %0, -1\n" |
| "\tbgtz\t%0, 1b\n" |
| :"=r"(loops) |
| :"0"(loops)); |
| } |
| |
| static inline void __udelay(unsigned long usecs, unsigned long lpj) |
| { |
| usecs *= (unsigned long)(((0x8000000000000000ULL / (500000 / HZ)) + |
| 0x80000000ULL) >> 32); |
| usecs = (unsigned long)(((unsigned long long)usecs * lpj) >> 32); |
| __delay(usecs); |
| } |
| |
| #define udelay(usecs) __udelay((usecs), loops_per_jiffy) |
| |
| /* make sure "usecs *= ..." in udelay do not overflow. */ |
| #if HZ >= 1000 |
| #define MAX_UDELAY_MS 1 |
| #elif HZ <= 200 |
| #define MAX_UDELAY_MS 5 |
| #else |
| #define MAX_UDELAY_MS (1000 / HZ) |
| #endif |
| |
| #endif |
