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57 lines
1022 B
57 lines
1022 B
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2011 Richard Weinberger <[email protected]> |
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* Mostly copied from arch/x86/lib/delay.c |
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*/ |
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#include <linux/export.h> |
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#include <linux/kernel.h> |
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#include <linux/delay.h> |
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#include <asm/param.h> |
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void __delay(unsigned long loops) |
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{ |
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asm volatile( |
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"test %0,%0\n" |
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"jz 3f\n" |
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"jmp 1f\n" |
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".align 16\n" |
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"1: jmp 2f\n" |
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".align 16\n" |
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"2: dec %0\n" |
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" jnz 2b\n" |
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"3: dec %0\n" |
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: /* we don't need output */ |
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: "a" (loops) |
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); |
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} |
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EXPORT_SYMBOL(__delay); |
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inline void __const_udelay(unsigned long xloops) |
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{ |
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int d0; |
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xloops *= 4; |
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asm("mull %%edx" |
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: "=d" (xloops), "=&a" (d0) |
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: "1" (xloops), "0" |
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(loops_per_jiffy * (HZ/4))); |
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__delay(++xloops); |
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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 * 0x000010c7); /* 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 * 0x00005); /* 2**32 / 1000000000 (rounded up) */ |
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} |
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EXPORT_SYMBOL(__ndelay);
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