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c764701a53
CONFIG_* == 1. If those variables are set, they will always be 1. Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net> Acked-by: Stefan Reinauer <stepan@coresystems.de> git-svn-id: svn://coreboot.org/repository/coreboot-v3@599 f3766cd6-281f-0410-b1cd-43a5c92072e9
109 lines
3 KiB
C
109 lines
3 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2007 Uwe Hermann <uwe@hermann-uwe.de>
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* Datasheet:
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* - Name: 82C54 CHMOS Programmable Interval Timer
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* - PDF: http://www.intel.com/design/archives/periphrl/docs/23124406.pdf
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* - Order number: 231244-006
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*/
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#include <io.h>
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#include <lib.h>
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#include <legacy.h>
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#define PC_SPEAKER_PORT 0x61
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/**
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* Use the PC speaker to create a tone/sound of the specified frequency.
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*
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* The Intel 82C54 CHMOS Programmable Interval Timer (PIT) provides a
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* superset of the functions of the original Intel 8253/8254 PIT. It has
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* three programmable counters/timers (counter 0, 1, and 2). Counter 2 can
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* be used to generate tones/sounds of various frequencies and duration.
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*
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* See also:
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* - http://en.wikipedia.org/wiki/Pc_speaker
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* - http://en.wikipedia.org/wiki/Intel_8253
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*
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* @param freq The frequency of the tone.
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*/
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void speaker_enable(u16 freq)
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{
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/*
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* Select counter 2. Read/write LSB first, then MSB. Use mode 3
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* (square wave generator). Use a 16bit binary counter.
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*/
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outb(0xb6, I82C54_CONTROL_WORD_REGISTER);
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/* Set the desired tone frequency. */
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outb((u8)(freq & 0x00ff), I82C54_COUNTER2); /* LSB */
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outb((u8)(freq >> 8), I82C54_COUNTER2); /* MSB */
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/* Enable the PC speaker (set bits 0 and 1). */
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outb(inb(PC_SPEAKER_PORT) | 0x03, PC_SPEAKER_PORT);
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}
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/**
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* Disable the PC speaker.
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*/
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void speaker_disable(void)
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{
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/* Disable the PC speaker (clear bits 0 and 1). */
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outb(inb(PC_SPEAKER_PORT) & 0xfc, PC_SPEAKER_PORT);
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}
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/**
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* Use the PC speaker to create a tone/beep of the specified frequency
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* and duration.
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*
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* Wait for a short amount of time after the beep to make it distinguishable
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* from the next beep (if any).
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*
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* @param freq The frequency of the tone/beep.
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* @param duration The duration of the tone/beep in milliseconds.
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*/
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void speaker_tone(u16 freq, unsigned int duration)
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{
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speaker_enable(freq);
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mdelay(duration);
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speaker_disable();
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delay(10);
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}
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/**
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* Use the PC speaker to create a short tone/beep.
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*/
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void beep_short(void)
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{
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#ifdef CONFIG_BEEPS
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speaker_tone(1760, 500); /* 1760 == note A6. */
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#endif
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}
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/**
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* Use the PC speaker to create a long tone/beep.
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*/
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void beep_long(void)
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{
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#ifdef CONFIG_BEEPS
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speaker_tone(1760, 2000); /* 1760 == note A6. */
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#endif
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}
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