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/* $Id: udelay.h,v 1.12 2006/09/13 20:07:59 entropy Exp $
*
* short delays
*
* Copyright (C) 1999, 2000 Michael Reinelt <reinelt@eunet.at>
* Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
*
* This file is part of LCD4Linux.
*
* LCD4Linux is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* LCD4Linux is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*
* $Log: udelay.h,v $
* Revision 1.12 2006/09/13 20:07:59 entropy
* Fixing bug #1494773 (compiles only on i368/amd64 machines) by providing a dummy implementation for other archs
*
* Revision 1.11 2005/12/12 09:08:08 reinelt
* finally removed old udelay code path; read timing values from config
*
* Revision 1.10 2005/05/08 04:32:45 reinelt
* CodingStyle added and applied
*
* Revision 1.9 2005/01/18 06:30:24 reinelt
* added (C) to all copyright statements
*
* Revision 1.8 2004/06/26 12:05:00 reinelt
*
* uh-oh... the last CVS log message messed up things a lot...
*
* Revision 1.7 2004/06/26 09:27:21 reinelt
*
* added '-W' to CFLAGS
* changed all C++ comments to C ones
* cleaned up a lot of signed/unsigned mistakes
*
* Revision 1.6 2004/06/20 10:09:56 reinelt
*
* 'const'ified the whole source
*
* Revision 1.5 2003/10/05 17:58:50 reinelt
* libtool junk; copyright messages cleaned up
*
* Revision 1.4 2002/04/29 11:00:28 reinelt
*
* added Toshiba T6963 driver
* added ndelay() with nanosecond resolution
*
* Revision 1.3 2001/03/12 13:44:58 reinelt
*
* new udelay() using Time Stamp Counters
*
* Revision 1.2 2001/03/12 12:39:36 reinelt
*
* reworked autoconf a lot: drivers may be excluded, #define's went to config.h
*
* Revision 1.1 2000/04/15 16:56:52 reinelt
*
* moved delay loops to udelay.c
* renamed -d (debugging) switch to -v (verbose)
* new switch -d to calibrate delay loop
* 'Delay' entry for HD44780 back again
* delay loops will not calibrate automatically, because this will fail with high CPU load
*
*/
#ifndef _UDELAY_H_
#define _UDELAY_H_
/* stolen from linux/asm-i386/processor.h */
/* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
static inline void rep_nop(void)
{
# if defined(__i386) || defined(__i386__) || defined(__AMD64__) || defined(__x86_64__) || defined(__amd64__)
/* intel or amd64 arch, the "rep" and "nop" opcodes are available */
__asm__ __volatile__("rep; nop");
# else
/* other Arch, maybe add core cooldown code here, too. */
do {
} while (0);
# endif
}
void udelay_init(void);
unsigned long timing(const char *driver, const char *section, const char *name, const int defval, const char *unit);
void ndelay(const unsigned long nsec);
#define udelay(usec) ndelay(usec*1000)
#endif
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