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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2009 coresystems GmbH
*
* This program 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; version 2 of the License.
*
* This program 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.
*/
#include <arch/io.h>
#include <pc80/i8254.h>
/* Initialize i8254 timers */
void setup_i8254(void)
{
/* Timer 0 (taken from biosemu) */
outb(TIMER0_SEL | WORD_ACCESS | MODE3 | BINARY_COUNT, TIMER_MODE_PORT);
outb(0x00, TIMER0_PORT);
outb(0x00, TIMER0_PORT);
/* Timer 1 */
outb(TIMER1_SEL | LOBYTE_ACCESS | MODE3 | BINARY_COUNT,
TIMER_MODE_PORT);
outb(0x12, TIMER1_PORT);
}
#if CONFIG(UDELAY_TIMER2)
static void load_timer2(unsigned int ticks)
{
/* Set up the timer gate, turn off the speaker */
outb((inb(PPC_PORTB) & ~PPCB_SPKR) | PPCB_T2GATE, PPC_PORTB);
outb(TIMER2_SEL | WORD_ACCESS | MODE0 | BINARY_COUNT, TIMER_MODE_PORT);
outb(ticks & 0xFF, TIMER2_PORT);
outb(ticks >> 8, TIMER2_PORT);
}
void udelay(int usecs)
{
load_timer2((usecs * TICKS_PER_MS) / 1000);
while ((inb(PPC_PORTB) & PPCB_T2OUT) == 0)
;
}
#endif
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