/*- * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Don Ahn. * * %sccs.include.redist.c% * * @(#)fd.c 7.4 (Berkeley) 10/11/92 */ /****************************************************************************/ /* standalone fd driver */ /****************************************************************************/ #include #include #include #include #include #include #define NUMRETRY 10 /*#define FDDEBUG*/ #define NFD 2 #define FDBLK 512 #define NUMTYPES 4 struct fd_type { int sectrac; /* sectors per track */ int secsize; /* size code for sectors */ int datalen; /* data len when secsize = 0 */ int gap; /* gap len between sectors */ int tracks; /* total num of tracks */ int size; /* size of disk in sectors */ int steptrac; /* steps per cylinder */ int trans; /* transfer speed code */ }; struct fd_type fd_types[NUMTYPES] = { { 18,2,0xFF,0x1B,80,2880,1,0 }, /* 1.44 meg HD 3.5in floppy */ { 15,2,0xFF,0x1B,80,2400,1,0 }, /* 1.2 meg HD floppy */ { 9,2,0xFF,0x23,40,720,2,1 }, /* 360k floppy in 1.2meg drive */ { 9,2,0xFF,0x2A,40,720,1,1 }, /* 360k floppy in DD drive */ }; /* state needed for current transfer */ static int fd_type; static int fd_motor; static int fd_retry; static int fd_drive; static int fd_status[7]; static int fdc = IO_FD1; /* floppy disk base */ /* Make sure DMA buffer doesn't cross 64k boundary */ char bounce[FDBLK]; /****************************************************************************/ /* fdstrategy */ /****************************************************************************/ int fdstrategy(io,func) register struct iob *io; int func; { char *address; long nblocks,blknum; int unit, iosize; #ifdef FDDEBUG printf("fdstrat "); #endif unit = io->i_unit; fd_type = io->i_part; /* * Set up block calculations. */ iosize = io->i_cc / FDBLK; blknum = (unsigned long) io->i_bn * DEV_BSIZE / FDBLK; nblocks = fd_types[fd_type].size; if ((blknum + iosize > nblocks) || blknum < 0) { #ifndef SMALL printf("bn = %d; sectors = %d; type = %d; fssize = %d ", blknum, iosize, fd_type, nblocks); printf("fdstrategy - I/O out of filesystem boundaries\n"); #endif return(-1); } address = io->i_ma; while (iosize > 0) { if (fdio(func, unit, blknum, address)) return(-1); iosize--; blknum++; address += FDBLK; } return(io->i_cc); } int fdio(func, unit, blknum, address) int func,unit,blknum; char *address; { int i,j,cyl,sectrac,sec,head,numretry; struct fd_type *ft; ft = &fd_types[fd_type]; #ifdef FDDEBUG printf("fdio "); #endif sectrac = ft->sectrac; cyl = blknum / (2 * sectrac); numretry = NUMRETRY; if (func == F_WRITE) bcopy(address,bounce,FDBLK); retry: out_fdc(15); /* Seek function */ out_fdc(unit); /* Drive number */ out_fdc(cyl); waitio(); out_fdc(0x8); i = in_fdc(); j = in_fdc(); if (!(i&0x20) || (cyl != j)) { numretry--; if (numretry) goto retry; #ifndef SMALL printf("Seek error %d, req = %d, at = %d\n",i,cyl,j); printf("unit %d, type %d, sectrac %d, blknum %d\n", unit,fd_type,sectrac,blknum); #endif return -1; } /* set up transfer */ fd_dma(func == F_READ, bounce, FDBLK); sec = blknum % (sectrac * 2); head = sec / sectrac; sec = sec % sectrac + 1; #ifdef FDDEBUG printf("sec %d hd %d cyl %d ", sec, head, cyl); #endif if (func == F_READ) out_fdc(0xE6);/* READ */ else out_fdc(0xC5); /* WRITE */ out_fdc(head << 2 | fd_drive); /* head & unit */ out_fdc(cyl); /* track */ out_fdc(head); out_fdc(sec); /* sector XXX +1? */ out_fdc(ft->secsize); /* sector size */ out_fdc(sectrac); /* sectors/track */ out_fdc(ft->gap); /* gap size */ out_fdc(ft->datalen); /* data length */ waitio(); for(i=0;i<7;i++) { fd_status[i] = in_fdc(); } if (fd_status[0]&0xF8) { numretry--; if (numretry) goto retry; #ifndef SMALL printf("FD err %lx %lx %lx %lx %lx %lx %lx\n", fd_status[0], fd_status[1], fd_status[2], fd_status[3], fd_status[4], fd_status[5], fd_status[6] ); #endif return -1; } if (func == F_READ) bcopy(bounce,address,FDBLK); return 0; } /****************************************************************************/ /* fdc in/out */ /****************************************************************************/ int in_fdc() { int i; while ((i = inb(fdc+fdsts) & 192) != 192) if (i == 128) return -1; return inb(0x3f5); } dump_stat() { int i; for(i=0;i<7;i++) { fd_status[i] = in_fdc(); if (fd_status[i] < 0) break; } #ifdef FDDEBUGx printf("FD bad status :%lx %lx %lx %lx %lx %lx %lx\n", fd_status[0], fd_status[1], fd_status[2], fd_status[3], fd_status[4], fd_status[5], fd_status[6] ); #endif } set_intr() { /* initialize 8259's */ outb(0x20,0x11); outb(0x21,32); outb(0x21,4); outb(0x21,1); outb(0x21,0x0f); /* turn on int 6 */ /* outb(0xa0,0x11); outb(0xa1,40); outb(0xa1,2); outb(0xa1,1); outb(0xa1,0xff); */ } waitio() { char c; int n; do outb(0x20,0xc); /* read polled interrupt */ while ((c=inb(0x20))&0x7f != 6); /* wait for int */ outb(0x20,0x20); } out_fdc(x) int x; { int r; do { r = (inb(fdc+fdsts) & 192); if (r==128) break; if (r==192) { dump_stat(); /* error: direction. eat up output */ } } while (1); outb(0x3f5,x&0xFF); } /****************************************************************************/ /* fdopen/fdclose */ /****************************************************************************/ fdopen(io) register struct iob *io; { int unit, type, i; struct fd_type *ft; unit = io->i_unit; type = io->i_part; io->i_boff = 0; /* no disklabels -- tar/dump wont work */ #ifdef FDDEBUG printf("fdopen %d %d ", unit, type); #endif ft = &fd_types[type]; fd_drive = unit; set_intr(); /* init intr cont */ /* Try a reset, keep motor on */ outb(0x3f2,0); for(i=0; i < 100000; i++); outb(0x3f2,unit | (unit ? 32 : 16) ); for(i=0; i < 100000; i++); outb(0x3f2,unit | 0xC | (unit ? 32 : 16) ); outb(0x3f7,ft->trans); fd_motor = 1; waitio(); out_fdc(3); /* specify command */ out_fdc(0xDF); out_fdc(2); out_fdc(7); /* Recalibrate Function */ out_fdc(unit); waitio(); return(0); } /****************************************************************************/ /* fd_dma */ /* set up DMA read/write operation and virtual address addr for nbytes */ /****************************************************************************/ fd_dma(read,addr,nbytes) int read; unsigned long addr; int nbytes; { /* Set read/write bytes */ if (read) { outb(0xC,0x46); outb(0xB,0x46); } else { outb(0xC,0x4A); outb(0xB,0x4A); } /* Send start address */ outb(0x4,addr & 0xFF); outb(0x4,(addr>>8) & 0xFF); outb(0x81,(addr>>16) & 0xFF); /* Send count */ nbytes--; outb(0x5,nbytes & 0xFF); outb(0x5,(nbytes>>8) & 0xFF); /* set channel 2 */ outb(0x0A,2); }