/*****************************************************************************************
Copyright (c) 2002-2004 The UbixOS Project
All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are
permitted provided that the following conditions are met:
Redistributions of source code must retain the above copyright notice, this list of
conditions, the following disclaimer and the list of authors. 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. 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 COPYRIGHT HOLDERS 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
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
$Id: pit.c 54 2016-01-11 01:29:55Z reddawg $
*****************************************************************************************/
#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
***/
