mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-12 07:57:21 +00:00
a187559e3d
Correct spelling of "U-Boot" shall be used in all written text (documentation, comments in source files etc.). Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Heiko Schocher <hs@denx.de> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Minkyu Kang <mk7.kang@samsung.com>
39 lines
955 B
C
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.
|
|
*/
|
|
|
|
static __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)
|
|
*/
|
|
static __inline__ void __udelay(unsigned long usecs)
|
|
{
|
|
__delay(usecs);
|
|
}
|
|
|
|
#endif
|