u-boot/arch/blackfin/include/asm/delay.h

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/*
* U-Boot - delay.h Routines for introducing delays
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*
* Copyright (c) 2005-2007 Analog Devices Inc.
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*
* SPDX-License-Identifier: GPL-2.0+
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*/
#ifndef _BLACKFIN_DELAY_H
#define _BLACKFIN_DELAY_H
/*
* Changes made by akbar.hussain@Lineo.com, for BLACKFIN
* Copyright (C) 1994 Hamish Macdonald
*
* Delay routines, using a pre-computed "loops_per_second" value.
*/
static __inline__ void __delay(unsigned long loops)
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{
__asm__ __volatile__("1:\t%0 += -1;\n\t"
"cc = %0 == 0;\n\t"
"if ! cc jump 1b;\n":"=d"(loops)
:"0"(loops));
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}
/*
* Use only for very small delays ( < 1 msec). Should probably use a
* lookup table, really, as the multiplications take much too long with
* short delays. This is a "reasonable" implementation, though (and the
* first constant multiplications gets optimized away if the delay is
* a constant)
*/
static __inline__ void __udelay(unsigned long usecs)
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{
__delay(usecs);
}
#endif