Release 4.18 arch/nds32/include/asm/delay.h

// 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));
}

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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);
}

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#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
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Directory: arch/nds32/include/asm

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