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41 lines
798 B
41 lines
798 B
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* delay loops |
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* |
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* Copyright (C) 2015 Yoshinori Sato |
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*/ |
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#include <linux/module.h> |
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#include <linux/delay.h> |
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#include <asm/param.h> |
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#include <asm/processor.h> |
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#include <asm/timex.h> |
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void __delay(unsigned long cycles) |
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{ |
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__asm__ volatile ("1: dec.l #1,%0\n\t" |
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"bne 1b":"=r"(cycles):"0"(cycles)); |
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} |
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EXPORT_SYMBOL(__delay); |
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void __const_udelay(unsigned long xloops) |
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{ |
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u64 loops; |
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loops = (u64)xloops * loops_per_jiffy * HZ; |
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__delay(loops >> 32); |
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} |
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EXPORT_SYMBOL(__const_udelay); |
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void __udelay(unsigned long usecs) |
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{ |
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__const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */ |
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} |
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EXPORT_SYMBOL(__udelay); |
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void __ndelay(unsigned long nsecs) |
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{ |
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__const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */ |
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} |
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EXPORT_SYMBOL(__ndelay);
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