/* Scan all drives and check if drive is present and disk is inserted */
int fdc_check_drive(FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
{
int i,drives,state;
/* OK procedure of data book is satisfied.
* trying to get some information over the drives */
state=0; /* no drives, no disks */
for(drives=0;drives<4;drives++) {
pCMD->drive=drives;
select_fdc_drive(pCMD);
pCMD->blnr=0; /* set to the 1st block */
if(fdc_recalibrate(pCMD,pFG)==FALSE)
continue;
if((pCMD->result[STATUS_0]&0x10)==0x10)
continue;
/* ok drive connected check for disk */
state|=(1<<drives);
pCMD->blnr=pFG->size; /* set to the last block */
if(fdc_seek(pCMD,pFG)==FALSE)
continue;
pCMD->blnr=0; /* set to the 1st block */
if(fdc_recalibrate(pCMD,pFG)==FALSE)
continue;
pCMD->cmd[COMMAND]=FDC_CMD_READ_ID;
if(fdc_issue_cmd(pCMD,pFG)==FALSE)
continue;
state|=(0x10<<drives);
}
stop_fdc_drive(pCMD);
for(i=0;i<4;i++) {
PRINTF("Floppy Drive %d %sconnected %sDisk inserted %s\n",i,
((state&(1<<i))==(1<<i)) ? "":"not ",
((state&(0x10<<i))==(0x10<<i)) ? "":"no ",
((state&(0x10<<i))==(0x10<<i)) ? pFG->name : "");
}
pCMD->flags=state;
return TRUE;
}
void fdc_read(int cyl,int head,int sect,int seccount)
{
//char cmd[9]={READ_DATA,head<<2,cyl,head,sect,2,seccount,0x1b,0xff};
char cmd[9]={0xe6,head<<2,cyl,head,sect,0x02,0x12,1,0xff};
for(int i=0;i<5;i++)
{
send_fdc_cmd(cmd,9);
while(!fdc_inted)io_hlt();
fdc_inted=false;
char res[7];
get_fdc_cmd(res,7);
int result=check_st0(res[0]);
if(result == 0)break;
fdc_recalibrate();
fdc_seek(cyl,head);
}
}
/* --- Main FDC dispatcher --- */
static void fdc_execute(FDC_765 *self)
{
/* This code to dump out FDC commands as they are received is very useful
* in debugging
*
* */
int NC;
fdc_dprintf(5, "FDC: ");
for (NC = 0; NC < bytes_in_cmd[self->fdc_cmd_buf[0] & 0x1F]; NC++)
fdc_dprintf(5, "%02x ", self->fdc_cmd_buf[NC]);
fdc_dprintf(5, "\n");
/* */
/* Check if the DOR (ugh!) is being used to force us to a
different drive. */
fdc_dorcheck(self);
/* Reset "seek finished" flag */
self->fdc_st0 &= 0xBF;
switch(self->fdc_cmd_buf[0] & 0x1F)
{
case 2: fdc_read_track(self); break; /* 2: READ TRACK */
case 3: fdc_specify(self); break; /* 3: SPECIFY */
case 4: fdc_sense_drive(self); break; /* 4: SENSE DRV STATUS*/
case 5: fdc_write(self, 0); break; /* 5: WRITE */
case 6: fdc_read(self, 0); break; /* 6: READ */
case 7: fdc_recalibrate(self); break; /* 7: RECALIBRATE */
case 8: fdc_sense_int(self); break; /* 8: SENSE INT STATUS*/
case 9: fdc_write(self, 1); break; /* 9: WRITE DELETED */
case 10:fdc_read_id(self); break; /*10: READ ID */
case 12:fdc_read(self, 1); break; /*12: READ DELETED */
case 13:fdc_format(self); break; /*13: FORMAT TRACK */
case 15:fdc_seek(self); break; /*15: SEEK */
case 17: /*17: SCAN EQUAL */
case 25: /*25: SCAN LOW/EQUAL */
case 30:fdc_scan(self); break; /*30: SCAN HIGH/EQUAL*/
default:
fdc_dprintf(2, "Unknown FDC command %d\n",
self->fdc_cmd_buf[0] & 0x1F);
fdc_error(self); break;
}
}
/* reads data from FDC, seek commands are issued automatic */
int fdc_read_data(unsigned char *buffer, unsigned long blocks,FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
{
/* first seek to start address */
unsigned long len,lastblk,readblk,i,timeout,ii,offset;
unsigned char pcn,c,retriesrw,retriescal;
unsigned char *bufferw; /* working buffer */
int sect_size;
int flags;
flags=disable_interrupts(); /* switch off all Interrupts */
select_fdc_drive(pCMD); /* switch on drive */
sect_size=0x080<<pFG->sect_code;
retriesrw=0;
retriescal=0;
offset=0;
if(fdc_seek(pCMD,pFG)==FALSE) {
stop_fdc_drive(pCMD);
enable_interrupts();
return FALSE;
}
if((pCMD->result[STATUS_0]&0x20)!=0x20) {
printf("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
stop_fdc_drive(pCMD);
enable_interrupts();
return FALSE;
}
pcn=pCMD->result[STATUS_PCN]; /* current track */
/* now determine the next seek point */
lastblk=pCMD->blnr + blocks;
/* readblk=(pFG->head*pFG->sect)-(pCMD->blnr%(pFG->head*pFG->sect)); */
readblk=pFG->sect-(pCMD->blnr%pFG->sect);
PRINTF("1st nr of block possible read %ld start %ld\n",readblk,pCMD->blnr);
if(readblk>blocks) /* is end within 1st track */
readblk=blocks; /* yes, correct it */
PRINTF("we read %ld blocks start %ld\n",readblk,pCMD->blnr);
bufferw=&buffer[0]; /* setup working buffer */
do {
retryrw:
len=sect_size * readblk;
pCMD->cmd[COMMAND]=FDC_CMD_READ;
if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
stop_fdc_drive(pCMD);
enable_interrupts();
return FALSE;
}
for (i=0;i<len;i++) {
timeout=FDC_TIME_OUT;
do {
c=read_fdc_reg(FDC_MSR);
if((c&0xC0)==0xC0) {
bufferw[i]=read_fdc_reg(FDC_FIFO);
break;
}
if((c&0xC0)==0x80) { /* output */
PRINTF("Transfer error transfered: at %ld, MSR=%02X\n",i,c);
if(i>6) {
for(ii=0;ii<7;ii++) {
pCMD->result[ii]=bufferw[(i-7+ii)];
} /* for */
}
if(retriesrw++>FDC_RW_RETRIES) {
if (retriescal++>FDC_CAL_RETRIES) {
stop_fdc_drive(pCMD);
enable_interrupts();
return FALSE;
}
else {
PRINTF(" trying to recalibrate Try %d\n",retriescal);
if(fdc_recalibrate(pCMD,pFG)==FALSE) {
stop_fdc_drive(pCMD);
enable_interrupts();
return FALSE;
}
retriesrw=0;
goto retrycal;
} /* else >FDC_CAL_RETRIES */
}
else {
PRINTF("Read retry %d\n",retriesrw);
goto retryrw;
} /* else >FDC_RW_RETRIES */
}/* if output */
timeout--;
}while(TRUE);
} /* for len */
/* the last sector of a track or all data has been read,
* we need to get the results */
fdc_terminate(pCMD);
offset+=(sect_size*readblk); /* set up buffer pointer */
bufferw=&buffer[offset];
pCMD->blnr+=readblk; /* update current block nr */
blocks-=readblk; /* update blocks */
if(blocks==0)
break; /* we are finish */
/* setup new read blocks */
/* readblk=pFG->head*pFG->sect; */
readblk=pFG->sect;
if(readblk>blocks)
readblk=blocks;
retrycal:
/* a seek is necessary */
if(fdc_seek(pCMD,pFG)==FALSE) {
stop_fdc_drive(pCMD);
enable_interrupts();
return FALSE;
}
if((pCMD->result[STATUS_0]&0x20)!=0x20) {
PRINTF("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
stop_fdc_drive(pCMD);
return FALSE;
}
pcn=pCMD->result[STATUS_PCN]; /* current track */
}while(TRUE); /* start over */
stop_fdc_drive(pCMD); /* switch off drive */
enable_interrupts();
return TRUE;
}