/* * 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. * * 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. */ #include <arch/io.h> #include <pc80/i8254.h> #include <console/console.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