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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 1a4596601fd395f3afb8f82f3f840c5e00bdd57a / . / arch / x86 / lib / pcat_timer.c
blob: 3545a5048e0c9f883263eed8a6a20bf1d9fc1b9a [file] [log] [blame]
Graeme Russ8c63d472009-02-24 21:14:45 +1100[diff] [blame]1/*
2 * (C) Copyright 2002
Albert ARIBAUDfa82f872011-08-04 18:45:45 +0200[diff] [blame]3 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
Graeme Russ8c63d472009-02-24 21:14:45 +1100[diff] [blame]4 *
Wolfgang Denk1a459662013-07-08 09:37:19 +0200[diff] [blame^]5 * SPDX-License-Identifier: GPL-2.0+
Graeme Russ8c63d472009-02-24 21:14:45 +1100[diff] [blame]6 */
7
8#include <common.h>
9#include <asm/io.h>
10#include <asm/i8254.h>
Graeme Russ8c63d472009-02-24 21:14:45 +1100[diff] [blame]11
Graeme Russ8c63d472009-02-24 21:14:45 +1100[diff] [blame]12#define TIMER2_VALUE 0x0a8e /* 440Hz */
13
Simon Glassd0b6f242013-04-17 16:13:39 +0000[diff] [blame]14int pcat_timer_init(void)
Graeme Russ8c63d472009-02-24 21:14:45 +1100[diff] [blame]15{
Simon Glassd0b6f242013-04-17 16:13:39 +0000[diff] [blame]16 /*
17 * initialize 2, used to drive the speaker
Stefan Reinauer5b1be1b2012-10-20 12:33:14 +0000[diff] [blame]18 * (to start a beep: write 3 to port 0x61,
Graeme Russ8c63d472009-02-24 21:14:45 +1100[diff] [blame]19 * to stop it again: write 0)
20 */
Graeme Russ83088af2011-11-08 02:33:15 +0000[diff] [blame]21 outb(PIT_CMD_CTR2 | PIT_CMD_BOTH | PIT_CMD_MODE3,
22 PIT_BASE + PIT_COMMAND);
23 outb(TIMER2_VALUE & 0xff, PIT_BASE + PIT_T2);
24 outb(TIMER2_VALUE >> 8, PIT_BASE + PIT_T2);
Graeme Russ8c63d472009-02-24 21:14:45 +1100[diff] [blame]25
Graeme Russ8c63d472009-02-24 21:14:45 +1100[diff] [blame]26 return 0;
27}