/*****************************************************************************************
Copyright (c) 2002 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
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.
$Log$
Revision 1.2 2004/04/22 21:20:05 reddawg
FDC now adds drives to the devfs
Revision 1.1.1.1 2004/04/15 12:07:09 reddawg
UbixOS v1.0
Revision 1.6 2004/04/13 16:36:33 reddawg
Changed our copyright, it is all now under a BSD-Style license
$Id$
*****************************************************************************************/
#include <isa/fdc.h>
#include <isa/8259.h>
#include <sys/video.h>
#include <sys/gdt.h>
#include <sys/idt.h>
#include <ubixos/types.h>
#include <sys/io.h>
#include <sys/dma.h>
#include <sys/drives.h>
#include <lib/kprintf.h>
static volatile bool done = FALSE;
static drvGeom geometry = { dg144Heads,dg144Tracks,dg144Spt };
static bool diskChange = FALSE;
static bool motor = FALSE;
static int mTick = 0;
static byte fdcTrack = 0xff;
static byte sr0 = 0;
static volatile int timeOut = 0;
static byte statSize = 0;
static byte status[7] = { 0 };
unsigned long tbaddr = 0x80000L;
void fdcInit() {
setVector(floppyIsr, mVec+6, (dInt+dPresent));
irqEnable(6);
reset();
addDrive(0,0,0x0,fdcRead,fdcWrite,0x0,(1024 * 1450));
devFsMkNod("fd0",'b',0x0,0x0);
return;
}
asm(
".globl floppyIsr \n"
"floppyIsr: \n"
" pusha \n"
" pushw %ds \n"
" pushw %es \n"
" pushw %ss \n"
" pushw %ss \n"
" popw %ds \n"
" popw %es \n"
" call floppyIsrhndlr \n"
" popw %es \n"
" popw %ds \n"
" popa \n"
" iret \n"
);
void floppyIsrhndlr() {
done = TRUE;
outportByte(0x20,0x20);
}
void sendByte(int byte) {
volatile int msr;
int tmo;
for (tmo=0;tmo<128;tmo++) {
msr = inportByte(fdcMsr);
if ((msr & 0xc0) == 0x80) {
outportByte(fdcData,byte);
return;
}
inportByte(0x80);
}
}
int getByte() {
volatile int msr;
int tmo;
for (tmo=0;tmo<128;tmo++) {
msr = inportByte(fdcMsr);
if ((msr & 0xd0) == 0xd0) {
return inportByte(fdcData);
}
inportByte(0x80);
}
return(-1);
}
bool fdcRw(int block,byte *blockBuffer,bool read,unsigned long numSectors) {
int head,track,sector,tries, copyCount = 0;
unsigned char *p_tbaddr = (char *)0x80000;
unsigned char *p_blockbuff = blockBuffer;
block2Hts(block,&head,&track,§or);
motorOn();
if (!read && blockBuffer) {
/* copy data from data buffer into track buffer */
for (copyCount=0; copyCount<(numSectors*512); copyCount++) {
*p_tbaddr = *p_blockbuff;
p_blockbuff++;
p_tbaddr++;
}
}
for (tries = 0;tries < 3;tries++) {
if (inportByte(fdcDir) & 0x80) {
diskChange = TRUE;
seek(1); /* clear "disk change" status */
recalibrate();
motorOff();
kprint("FDC: Disk change detected. Trying again.\n");
return fdcRw(block, blockBuffer, read, numSectors);
}
if (!seek(track)) {
motorOff();
kprintf("FDC: Error seeking to track [%i]\n",block);
return FALSE;
}
outportByte(fdcCcr,0);
if (read) {
dmaXfer(2,tbaddr,numSectors*512,FALSE);
sendByte(cmdRead);
}
else {
dmaXfer(2,tbaddr,numSectors*512,TRUE);
sendByte(cmdWrite);
}
sendByte(head << 2);
sendByte(track);
sendByte(head);
sendByte(sector);
sendByte(2); /* 512 bytes/sector */
sendByte(geometry.spt);
if (geometry.spt == dg144Spt) {
sendByte(dg144Gap3rw); /* gap 3 size for 1.44M read/write */
}
else {
sendByte(dg168Gap3rw); /* gap 3 size for 1.68M read/write */
}
sendByte(0xff); /* DTL = unused */
if (!waitFdc(TRUE)) {
kprint("Timed out, trying operation again after reset()\n");
reset();
return fdcRw(block, blockBuffer, read, numSectors);
}
if ((status[0] & 0xc0) == 0) break; /* worked! outta here! */
recalibrate(); /* oops, try again... */
}
motorOff();
if (read && blockBuffer) {
p_blockbuff = blockBuffer;
p_tbaddr = (char *) 0x80000;
for (copyCount=0; copyCount<(numSectors*512); copyCount++) {
*p_blockbuff = *p_tbaddr;
p_blockbuff++;
p_tbaddr++;
}
}
return (tries != 3);
}
void block2Hts(int block,int *head,int *track,int *sector) {
*head = (block % (geometry.spt * geometry.heads)) / (geometry.spt);
*track = block / (geometry.spt * geometry.heads);
*sector = block % geometry.spt + 1;
}
void motorOn(void) {
if (!motor) {
mTick = -1; /* stop motor kill countdown */
outportByte(fdcDor,0x1c);
motor = TRUE;
}
}
void motorOff(void) {
if (motor) {
mTick = 13500;
}
}
bool seek(int track) {
if (fdcTrack == track) {
return(TRUE);
}
sendByte(cmdSeek);
sendByte(0);
sendByte(track);
if (!waitFdc(TRUE)) {
return(FALSE);
}
if ((sr0 != 0x20) || (fdcTrack != track)) {
return(FALSE);
}
else {
return(TRUE);
}
}
bool readBlock(int block,byte *blockBuffer, unsigned long numSectors) {
int track=0, sector=0, head=0, track2=0, result=0, loop=0;
block2Hts(block, &head, &track, §or);
block2Hts(block+numSectors, &head, &track2, §or);
if (track!=track2) {
for (loop=0; loop<numSectors; loop++) {
result = fdcRw(block+loop, blockBuffer+(loop*512), TRUE, 1);
}
return result;
}
return fdcRw(block,blockBuffer,TRUE,numSectors);
}
bool writeBlock(int block,byte *blockBuffer, unsigned long numSectors) {
return fdcRw(block,blockBuffer,FALSE, numSectors);
}
bool waitFdc(bool sensei) {
timeOut = 50000;
while (!done && timeOut);
statSize = 0;
while ((statSize < 7) && (inportByte(fdcMsr) & (1<<4))) {
status[statSize++] = getByte();
}
if (sensei) {
sendByte(cmdSensei);
sr0 = getByte();
fdcTrack = getByte();
}
done = FALSE;
if (!timeOut) {
if (inportByte(fdcDir) & 0x80) {
diskChange = TRUE;
}
return(FALSE);
}
else {
return(TRUE);
}
}
void recalibrate(void) {
motorOn();
sendByte(cmdRecal);
sendByte(0);
waitFdc(TRUE);
motorOff();
}
void reset(void) {
outportByte(fdcDor,0);
mTick = 0;
motor = FALSE;
outportByte(fdcDor,0x0c);
done = TRUE;
waitFdc(TRUE);
sendByte(cmdSpecify);
sendByte(0xdf);
sendByte(0x02);
seek(1);
recalibrate();
diskChange = FALSE;
return;
}
void fdcRead(void *info,long startSector,long sectorCount,void *baseAddr) {
readBlock(startSector,baseAddr,sectorCount);
return;
}
void fdcWrite(void *info,long startSector,long sectorCount,void *baseAddr){
writeBlock(startSector,baseAddr,sectorCount);
return;
}
