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