78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
/*
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* Copyright (C) 2004 Tobias Lorenz
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include "etherboot.h"
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#include "timer.h"
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#include "latch.h"
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#include "hardware.h"
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/* get timer returns the contents of the timer */
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static unsigned long get_timer(void)
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{
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return P2001_TIMER->Freerun_Timer;
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}
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/* ------ Calibrate the TSC -------
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* Time how long it takes to excute a loop that runs in known time.
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* And find the convertion needed to get to CLOCK_TICK_RATE
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*/
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static unsigned long configure_timer(void)
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{
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return (1);
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}
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static unsigned long clocks_per_tick = 1;
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void setup_timers(void)
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{
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if (!clocks_per_tick) {
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clocks_per_tick = configure_timer();
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}
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}
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unsigned long currticks(void)
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{
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return get_timer(); /* /clocks_per_tick */
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}
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static unsigned long timer_timeout;
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static int __timer_running(void)
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{
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return get_timer() < timer_timeout;
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}
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void udelay(unsigned int usecs)
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{
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unsigned long now;
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now = get_timer();
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timer_timeout = now + usecs * ((clocks_per_tick * TICKS_PER_SEC)/(1000*1000));
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while(__timer_running());
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}
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void ndelay(unsigned int nsecs)
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{
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unsigned long now;
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now = get_timer();
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timer_timeout = now + nsecs * ((clocks_per_tick * TICKS_PER_SEC)/(1000*1000*1000));
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while(__timer_running());
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}
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void load_timer2(unsigned int timer2_ticks)
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{
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unsigned long now;
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unsigned long clocks;
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now = get_timer();
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clocks = timer2_ticks * ((clocks_per_tick * TICKS_PER_SEC)/CLOCK_TICK_RATE);
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timer_timeout = now + clocks;
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}
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int timer2_running(void)
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{
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return __timer_running();
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}
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