mirror of
https://github.com/netfun2000/lcd4linux.git
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b4295fcc84
git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@844 3ae390bd-cb1e-0410-b409-cd5a39f66f1f
115 lines
2.9 KiB
C
115 lines
2.9 KiB
C
/* $Id$
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* $URL$
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*
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* short delays
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*
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* Copyright (C) 1999, 2000 Michael Reinelt <michael@reinelt.co.at>
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* Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
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*
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* This file is part of LCD4Linux.
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*
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* LCD4Linux is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* LCD4Linux 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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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/*
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*
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* exported fuctions:
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*
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* void udelay_init (void)
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* selects delay method (gettimeofday() ord rdtsc() according
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* to processor features
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*
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* unsigned long timing (const char *driver, const char *section, const char *name, const int defval, const char *unit);
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* returns a timing value from config or the default value
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*
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* void udelay (unsigned long usec)
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* delays program execution for usec microseconds
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* uses global variable 'loops_per_usec', which has to be set before.
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* This function does busy-waiting! so use only for delays smaller
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* than 10 msec
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*
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <math.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/time.h>
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#include "debug.h"
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#include "cfg.h"
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#include "qprintf.h"
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#include "udelay.h"
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void udelay_init(void)
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{
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info("udelay: using gettimeofday() delay loop");
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}
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unsigned long timing(const char *driver, const char *section, const char *name, const int defval, const char *unit)
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{
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char sec[256];
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int fuzz, val;
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qprintf(sec, sizeof(sec), "%s.Timing", section);
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/* fuzz all timings by given factor */
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cfg_number(sec, "fuzz", 100, 1, -1, &fuzz);
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cfg_number(sec, name, defval, 0, -1, &val);
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val = val * fuzz / 100;
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if (val != defval) {
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if (fuzz != 100) {
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info("%s: timing: %6s = %5d %s (default %d %s, fuzz %d)", driver, name, val, unit, defval, unit, fuzz);
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} else {
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info("%s: timing: %6s = %5d %s (default %d %s)", driver, name, val, unit, defval, unit);
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}
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} else {
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info("%s: timing: %6s = %5d %s (default)", driver, name, defval, unit);
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}
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return val;
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}
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void ndelay(const unsigned long nsec)
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{
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struct timeval now, end;
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gettimeofday(&end, NULL);
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end.tv_usec += (nsec + 999) / 1000;
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while (end.tv_usec > 1000000) {
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end.tv_usec -= 1000000;
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end.tv_sec++;
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}
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do {
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rep_nop();
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gettimeofday(&now, NULL);
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} while (now.tv_sec == end.tv_sec ? now.tv_usec < end.tv_usec : now.tv_sec < end.tv_sec);
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}
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