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https://github.com/AsahiLinux/u-boot
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3eb90bad65
According to the PPC reference implementation the udelay() function is responsible for resetting the watchdog timer as frequently as needed. Most other architectures do not meet that requirement, so long-running operations might result in a watchdog reset. This patch adds a generic udelay() function which takes care of resetting the watchdog before calling an architecture-specific __udelay(). Signed-off-by: Ingo van Lil <inguin@gmx.de>
55 lines
1.7 KiB
C
55 lines
1.7 KiB
C
/*
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* U-boot - delay.h Routines for introducing delays
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*
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* Copyright (c) 2005-2007 Analog Devices Inc.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#ifndef _BLACKFIN_DELAY_H
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#define _BLACKFIN_DELAY_H
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/*
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* Changes made by akbar.hussain@Lineo.com, for BLACKFIN
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* Copyright (C) 1994 Hamish Macdonald
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*
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* Delay routines, using a pre-computed "loops_per_second" value.
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*/
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extern __inline__ void __delay(unsigned long loops)
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{
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__asm__ __volatile__("1:\t%0 += -1;\n\t"
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"cc = %0 == 0;\n\t"
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"if ! cc jump 1b;\n":"=d"(loops)
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:"0"(loops));
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}
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/*
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* Use only for very small delays ( < 1 msec). Should probably use a
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* lookup table, really, as the multiplications take much too long with
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* short delays. This is a "reasonable" implementation, though (and the
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* first constant multiplications gets optimized away if the delay is
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* a constant)
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*/
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extern __inline__ void __udelay(unsigned long usecs)
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{
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__delay(usecs);
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}
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#endif
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