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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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41 lines
762 B
C
41 lines
762 B
C
/*
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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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