18c2ecf20Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */ 28c2ecf20Sopenharmony_ci// Copyright (C) 2005-2017 Andes Technology Corporation 38c2ecf20Sopenharmony_ci 48c2ecf20Sopenharmony_ci#ifndef __NDS32_DELAY_H__ 58c2ecf20Sopenharmony_ci#define __NDS32_DELAY_H__ 68c2ecf20Sopenharmony_ci 78c2ecf20Sopenharmony_ci#include <asm/param.h> 88c2ecf20Sopenharmony_ci 98c2ecf20Sopenharmony_ci/* There is no clocksource cycle counter in the CPU. */ 108c2ecf20Sopenharmony_cistatic inline void __delay(unsigned long loops) 118c2ecf20Sopenharmony_ci{ 128c2ecf20Sopenharmony_ci __asm__ __volatile__(".align 2\n" 138c2ecf20Sopenharmony_ci "1:\n" 148c2ecf20Sopenharmony_ci "\taddi\t%0, %0, -1\n" 158c2ecf20Sopenharmony_ci "\tbgtz\t%0, 1b\n" 168c2ecf20Sopenharmony_ci :"=r"(loops) 178c2ecf20Sopenharmony_ci :"0"(loops)); 188c2ecf20Sopenharmony_ci} 198c2ecf20Sopenharmony_ci 208c2ecf20Sopenharmony_cistatic inline void __udelay(unsigned long usecs, unsigned long lpj) 218c2ecf20Sopenharmony_ci{ 228c2ecf20Sopenharmony_ci usecs *= (unsigned long)(((0x8000000000000000ULL / (500000 / HZ)) + 238c2ecf20Sopenharmony_ci 0x80000000ULL) >> 32); 248c2ecf20Sopenharmony_ci usecs = (unsigned long)(((unsigned long long)usecs * lpj) >> 32); 258c2ecf20Sopenharmony_ci __delay(usecs); 268c2ecf20Sopenharmony_ci} 278c2ecf20Sopenharmony_ci 288c2ecf20Sopenharmony_ci#define udelay(usecs) __udelay((usecs), loops_per_jiffy) 298c2ecf20Sopenharmony_ci 308c2ecf20Sopenharmony_ci/* make sure "usecs *= ..." in udelay do not overflow. */ 318c2ecf20Sopenharmony_ci#if HZ >= 1000 328c2ecf20Sopenharmony_ci#define MAX_UDELAY_MS 1 338c2ecf20Sopenharmony_ci#elif HZ <= 200 348c2ecf20Sopenharmony_ci#define MAX_UDELAY_MS 5 358c2ecf20Sopenharmony_ci#else 368c2ecf20Sopenharmony_ci#define MAX_UDELAY_MS (1000 / HZ) 378c2ecf20Sopenharmony_ci#endif 388c2ecf20Sopenharmony_ci 398c2ecf20Sopenharmony_ci#endif 40