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58 lines
1.2 KiB
58 lines
1.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* OpenRISC Linux |
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* |
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* Linux architectural port borrowing liberally from similar works of |
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* others. All original copyrights apply as per the original source |
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* declaration. |
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* |
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* Modifications for the OpenRISC architecture: |
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* Copyright (C) 2010-2011 Jonas Bonn <[email protected]> |
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* |
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* Precise Delay Loops |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/export.h> |
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#include <linux/init.h> |
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#include <asm/param.h> |
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#include <asm/delay.h> |
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#include <asm/timex.h> |
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#include <asm/processor.h> |
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int read_current_timer(unsigned long *timer_value) |
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{ |
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*timer_value = get_cycles(); |
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return 0; |
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} |
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void __delay(unsigned long cycles) |
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{ |
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cycles_t start = get_cycles(); |
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while ((get_cycles() - start) < cycles) |
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cpu_relax(); |
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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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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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