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39 lines
812 B
39 lines
812 B
// SPDX-License-Identifier: GPL-2.0 |
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/delay.h> |
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void __delay(unsigned long loops) |
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{ |
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asm volatile ( |
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"mov r0, r0\n" |
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"1:declt %0\n" |
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"bf 1b" |
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: "=r"(loops) |
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: "0"(loops)); |
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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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unsigned long long loops; |
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loops = (unsigned long long)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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