/*-
* Copyright (c) 2002-2018 The UbixOS Project.
* All rights reserved.
*
* This was developed by Christopher W. Olsen for the UbixOS Project.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted
* provided that the following conditions are met:
*
* 1) Redistributions of source code must retain the above copyright notice, this list of
* conditions, the following disclaimer and the list of authors.
* 2) Redistributions in binary form must reproduce the above copyright notice, this list of
* conditions, the following disclaimer and the list of authors in the documentation and/or
* other materials provided with the distribution.
* 3) Neither the name of the UbixOS Project nor the names of its contributors may be used to
* endorse or promote products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <isa/pit.h>
#include <sys/io.h>
#include <lib/kprintf.h>
/*****************************************************************************************
Function: int pitInit()
Description: This Function Will Initialize The Programmable Timer
Notes:
0040 r/w PIT counter 0, counter divisor (XT, AT, PS/2)
0041 r/w PIT counter 1, RAM refresh counter (XT, AT)
0042 r/w PIT counter 2, cassette & speaker (XT, AT, PS/2)
0043 r/w PIT mode port, control word register for counters 0-2
bit 7-6 = 00 counter 0 select
= 01 counter 1 select (not PS/2)
= 10 counter 2 select
bit 5-4 = 00 counter latch command
= 01 read/write counter bits 0-7 only
= 10 read/write counter bits 8-15 only
= 11 read/write counter bits 0-7 first, then 8-15
bit 3-1 = 000 mode 0 select
= 001 mode 1 select - programmable one shot
= x10 mode 2 select - rate generator
= x11 mode 3 select - square wave generator
= 100 mode 4 select - software triggered strobe
= 101 mode 5 select - hardware triggered strobe
bit 0 = 0 binary counter 16 bits
= 1 BCD counter
*****************************************************************************************/
int pit_init() {
outportByteP(0x43, 0x36);
outportByteP(0x40, ((1193180 / PIT_TIMER) & 0xFF));
outportByte(0x40, (((1193180 / PIT_TIMER) >> 8) & 0xFF));
/* Print out information on the PIT */
kprintf("pit0 - Port [0x%X], Timer Hz: [%iHz]\n", 0x43, PIT_TIMER);
/* Return so we know everything went well */
return (0x0);
}
/***
$Log: pit.c,v $
Revision 1.1.1.1 2006/06/01 12:46:12 reddawg
ubix2
Revision 1.2 2005/10/12 00:13:37 reddawg
Removed
Revision 1.1.1.1 2005/09/26 17:24:03 reddawg
no message
Revision 1.7 2004/07/16 04:06:32 reddawg
Tune ups this stuff should of been taken care of months ago
Revision 1.6 2004/07/16 01:08:58 reddawg
Whew we work once again
Revision 1.5 2004/07/09 13:29:15 reddawg
pit: pitInit to pit_init
Adjusted initialization routines
Revision 1.4 2004/05/21 12:48:22 reddawg
Cleaned up
Revision 1.3 2004/05/20 22:51:09 reddawg
Cleaned Up Warnings
Revision 1.2 2004/05/10 02:23:24 reddawg
Minor Changes To Source Code To Prepare It For Open Source Release
END
***/
