u-boot/arch/blackfin/include/asm/delay.h
Wolfgang Denk 1a4596601f Add GPL-2.0+ SPDX-License-Identifier to source files
Signed-off-by: Wolfgang Denk <wd@denx.de>
[trini: Fixup common/cmd_io.c]
Signed-off-by: Tom Rini <trini@ti.com>
2013-07-24 09:44:38 -04:00

39 lines
955 B
C

/*
* U-boot - delay.h Routines for introducing delays
*
* Copyright (c) 2005-2007 Analog Devices Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#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.
*/
extern __inline__ void __delay(unsigned long loops)
{
__asm__ __volatile__("1:\t%0 += -1;\n\t"
"cc = %0 == 0;\n\t"
"if ! cc jump 1b;\n":"=d"(loops)
:"0"(loops));
}
/*
* 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)
*/
extern __inline__ void __udelay(unsigned long usecs)
{
__delay(usecs);
}
#endif