| /* |
| * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #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); |
| } |
| |
| #ifdef 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 |