/*- * Copyright (c) 1991 The Regents of the University of California. * All rights reserved. * * 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 and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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. * * from: @(#)wt.c 7.1 (Berkeley) 5/9/91 * $Id: wt.c,v 1.9 1994/03/08 12:21:31 mycroft Exp $ */ /* * * Copyright (c) 1989 Carnegie-Mellon University. * All rights reserved. * * Authors: Robert Baron * * Permission to use, copy, modify and distribute this software and * its documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. * * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. * * Carnegie Mellon requests users of this software to return to * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 * * any improvements or extensions that they make and grant Carnegie the * rights to redistribute these changes. */ #include "wt.h" #if NWT > 0 /* * * Copyright 1988, 1989 by Intel Corporation * * Support Bell Tech QIC-02 and WANGTEK QIC-36 or QIC-02 */ #include #include #include #include #include #include #include #include #ifdef ORC unsigned wtport = 0x288; /* base I/O port of controller */ #else ORC unsigned wtport = 0x300; /* base I/O port of controller */ #endif ORC /* standard = 0x300 */ /* alternate = 0x338 */ unsigned wtchan = 1; /* DMA channel number */ /* stardard = 1 */ /* hardware permits 1, 2 or 3. */ /* (Avoid DMA 2: used by disks) */ int first_wtopen_ever = 1; #define ERROR 1 /* return from tape routines */ #define SUCCESS 0 /* return from tape routines */ int wci = 0; int exflag = 0; int bytes = 0; static unsigned char eqdma = 0x8; static unsigned char pagereg = 0x83; static unsigned char dmareg = 2; static unsigned char dma_write = 0x49; static unsigned char dma_read = 0x45; static unsigned char dma_done = 2; static unsigned char mode = 0; static unsigned char mbits; /* map bits into each other */ static long bufptr; static unsigned numbytes; /* _wci dw 0 ; interrupt chain finished normally _exflag dw 0 ; exception variable _bytes dw 0 ; current bytes eqdma db 8h ; enable dma command: ch1,ch2=8h, ch3=10h pagereg db 83h ; ch1=83h, ch2=81h, ch3=82h dmareg db 2 ; ch1=2, ch2=4, ch3=6 dma_write db 49h ; write dma command: 48h+_wtchan dma_read db 45h ; read dma command: 44h+_wtchan dma_done db 2 ; dma done flag: 1<<_wtchan mode db 0 ; dma operation mode lbufptr dw 0 ; buffer pointer to data buffers, low word hbufptr dw 0 ; buffer pointer to data buffers, high word numbytes dw 0 ; number of bytes to read or write (new) */ #define PAGESIZ 4096 #define HZ 60 /* tape controller ports */ #define STATPORT wtport #define CTLPORT STATPORT #define CMDPORT (wtport+1) #define DATAPORT CMDPORT /* defines for reading out status from wangtek tape controller */ #define READY 0x01 /* ready bit define */ #define EXCEP 0x02 /* exception bit define */ #define STAT (READY|EXCEP) #define RESETMASK 0x7 #define RESETVAL (RESETMASK & ~EXCEP) /* tape controller control bits (CTLPORT) */ #define ONLINE 0x01 #define RESET 0x02 #define REQUEST 0x04 /* request command */ #define CMDOFF 0xC0 /* QIC-02 commands (CMDPORT) */ #define RDDATA 0x80 /* read data */ #define READFM 0xA0 /* read file mark */ #define WRTDATA 0x40 /* write data */ #define WRITEFM 0x60 /* write file mark */ #define RDSTAT 0xC0 /* read status command */ #define REWIND 0x21 /* rewind command (position+bot) */ /* 8237 DMA controller regs */ #define STATUSREG 0x8 #define MASKREG 0xA #define MODEREG 0xB #define CLEARFF 0xC /* streamer tape block size */ #define BLKSIZE 512 /* Tape characteristics */ #define NBPS 512 /* 512-byte blocks */ #define ERROR 1 /* return from tape routines */ #define SUCCESS 0 /* return from tape routines */ /* Minor devs */ #define TP_REWCLOSE(d) ((minor(d)&04) == 0) /* Rewind tape on close if read/write */ #define TP_DENS(dev) ((minor(dev) >> 3) & 03) /* set density */ #define TPHOG(d) 0 /* use Hogproc during tape I/O */ /* defines for wtflags */ #define TPINUSE 0x0001 /* tape is already open */ #define TPREAD 0x0002 /* tape is only open for reading */ #define TPWRITE 0x0004 /* tape is only open for writing */ #define TPSTART 0x0008 /* tape must be rewound and reset */ #define TPDEAD 0x0010 /* tape drive does not work or driver error */ #define TPSESS 0x0020 /* no more reads or writes allowed in session */ /* for example, when tape has to be changed */ #define TPSTOP 0x0040 /* Stop command outstanding */ #define TPREW 0x0080 /* Rewind command outstanding, see wtdsl2() */ #define TPVOL 0x0100 /* Read file mark, or hit end of tape */ #define TPWO 0x0200 /* write command outstanding */ #define TPRO 0x0400 /* read command outstanding */ #define TPWANY 0x0800 /* write command requested */ #define TPRANY 0x1000 /* read command requested */ #define TPWP 0x2000 /* write protect error seen */ unsigned int wtflags = TPSTART; /* state of tape drive */ struct buf rwtbuf; /* header for raw i/o */ struct proc *myproc; /* process which opened tape driver */ char wtimeron; /* wtimer() active flag */ char wtio; /* dma (i/o) active flag */ char isrlock; /* isr() flag */ struct proc * Hogproc; /* no Hogproc on Microport */ #define ftoseg(x) ((unsigned) (x >> 16)) struct wtstatus { ushort wt_err; /* code for error encountered */ ushort wt_ercnt; /* number of error blocks */ ushort wt_urcnt; /* number of underruns */ } wterror; /* defines for wtstatus.wt_err */ #define TP_POR 0x100 /* Power on/reset occurred */ #define TP_RES1 0x200 /* Reserved for end of media */ #define TP_RES2 0x400 /* Reserved for bus parity */ #define TP_BOM 0x800 /* Beginning of media */ #define TP_MBD 0x1000 /* Marginal block detected */ #define TP_NDT 0x2000 /* No data detected */ #define TP_ILL 0x4000 /* Illegal command */ #define TP_ST1 0x8000 /* Status byte 1 bits */ #define TP_FIL 0x01 /* File mark detected */ #define TP_BNL 0x02 /* Bad block not located */ #define TP_UDA 0x04 /* Unrecoverable data error */ #define TP_EOM 0x08 /* End of media */ #define TP_WRP 0x10 /* Write protected cartridge */ #define TP_USL 0x20 /* Unselected drive */ #define TP_CNI 0x40 /* Cartridge not in place */ #define TP_ST0 0x80 /* Status byte 0 bits */ /* Grounds for reporting I/O error to user */ #define TP_ERR0 (TP_BNL|TP_UDA|TP_WRP|TP_CNI|TP_FIL|TP_EOM|TP_USL) #define TP_ERR1 (TP_MBD|TP_NDT|TP_ILL) /* TP_ILL should never happen! */ /* #define TP_ERR0 0x7f #define TP_ERR1 0x7700 */ /* defines for reading out status from wangtek tape controller */ #define READY 0x01 /* ready bit define */ #define EXCEP 0x02 /* exception bit define */ /* sleep priority */ #define WTPRI (PZERO+10) char pagebuf[NBPS]; /* buffer of size NBPS */ unsigned long pageaddr; /* physical addr of pagebuf */ /* pageaddr is used with DMA controller */ time_t Hogtime; /* lbolt when Hog timer started */ extern time_t lbolt; #define debug printf /* * Strategy routine. * * Arguments: * Pointer to buffer structure * Function: * Start transfer. * * It would be nice to have this multiple-threaded. * There is a version of dump from Berkeley that works with multiple processes * trading off with disk & tape I/O. */ int wtstrategy(bp) register struct buf *bp; { unsigned ucnt1, ucnt2, finished; unsigned long adr1, adr2; int bad; adr1 = kvtop(bp->b_un.b_addr); #ifdef DEBUG debug("bpaddr %x\n", adr1); #endif ucnt1 = bp->b_bcount % NBPG; ucnt2 = 0; adr2 = 0; #ifdef DEBUG debug("WTstart: adr1 %lx cnt %x\n", adr1, ucnt1); #endif /* 64K boundary? (XXX) */ if (ftoseg(adr1) != ftoseg(adr1 + (unsigned) ucnt1 - 1)) { adr2 = (adr1 & 0xffff0000L) + 0x10000L; ucnt2 = (adr1 + ucnt1) - adr2; ucnt1 -= ucnt2; } /* page boundary? */ if (trunc_page(adr1) != trunc_page(adr1 + (unsigned) ucnt1 - 1)) { unsigned u; u = NBPG - ((unsigned)bp->b_un.b_addr & (NBPG-1)); adr2 = kvtop(bp->b_un.b_addr + u); ucnt2 = ucnt1 - u; ucnt1 = u; } /* at file marks and end of tape, we just return '0 bytes available' */ if (wtflags & TPVOL) { bp->b_resid = bp->b_bcount; goto xit; } if ((Hogproc == (struct proc *) 0) && TPHOG(bp->b_dev)) { #ifdef DEBUG printf("setting Hogproc\n"); #endif Hogtime = 0; Hogproc = myproc; } if (bp->b_flags & B_READ) { bad = 0; /* For now, we assume that all data will be copied out */ /* If read command outstanding, just skip down */ if (!(wtflags & TPRO)) { if (ERROR == wtsense(TP_WRP)) /* clear status */ goto errxit; #ifdef DEBUG debug("WTread: Start read\n"); #endif if (!(wtflags & TPREAD) || (wtflags & TPWANY) || (rstart() == ERROR)) { #ifdef DEBUG debug("Tpstart: read init error\n"); /* */ #endif goto errxit; } wtflags |= TPRO|TPRANY; } finished = 0; /* Take a deep breath */ if (ucnt1) { if ((rtape(adr1, ucnt1) == ERROR) && (wtsense(TP_WRP) == ERROR)) goto endio; /* wait for it */ bad = pollrdy(); finished = bytes; if (bad) goto endio; } /* if a second I/O region, start it */ if (ucnt2) { if ((rtape(adr2, ucnt2) == ERROR) && (wtsense(TP_WRP) == ERROR)) ucnt2 = 0; /* don't poll for me */ } /* if second i/o pending wait for it */ if (ucnt2) { pollrdy(); /* whether pollrdy is ok or not */ finished += bytes; } } else { if (wtflags & TPWP) /* write protected */ goto errxit; /* If write command outstanding, just skip down */ if (!(wtflags & TPWO)) { if (ERROR == wtsense(0)) /* clear status */ { #ifdef DEBUG debug("TPstart: sense 0\n"); #endif goto errxit; } if (!(wtflags & TPWRITE) || (wtflags & TPRANY) || (wstart() == ERROR)) { #ifdef DEBUG debug("Tpstart: write init error\n"); /* */ #endif wtsense(0); errxit: bp->b_flags |= B_ERROR; bp->b_resid = bp->b_bcount; goto xit; } wtflags |= TPWO|TPWANY; } /* and hold your nose */ if (ucnt1 && ((wtape(adr1, ucnt1) == ERROR) && (wtsense(0) == ERROR))) finished = bytes; else if (ucnt2 && (((ucnt1 && pollrdy()) || (wtape(adr2, ucnt2) == ERROR)) && (wtsense(0) == ERROR))) finished = ucnt1 + NBPS + bytes; /* All writes and/or copyins were fine! */ else finished = bp->b_bcount; bad = pollrdy(); } endio: if(bad == EIO) bad = 0; wterror.wt_err = 0; if (exflag && wtsense((bp->b_flags & B_READ) ? TP_WRP : 0)) { if ((wterror.wt_err & TP_ST0) && (wterror.wt_err & (TP_FIL|TP_EOM))) { #ifdef DEBUG debug("WTsta: Hit end of tape\n"); /* */ #endif wtflags |= TPVOL; if (wterror.wt_err & TP_FIL) { if (wtflags & TPRO) /* interrupter is bogus */ rstart(); /* restart read command */ else wtflags &= ~TPWO; finished += NBPS; } /* Reading file marks or writing end of tape return 0 bytes */ } else { bp->b_flags |= B_ERROR; wtflags &= ~(TPWO|TPRO); } } if(bad) { bp->b_flags |= B_ERROR; bp->b_error = bad; } bp->b_resid = bp->b_bcount - finished; xit: biodone(bp); if (wtimeron) Hogtime = lbolt; else if (Hogproc == myproc) Hogproc = (struct proc *) 0; } /* * simulate an interrupt periodically while I/O is going * this is necessary in case interrupts get eaten due to * multiple devices on a single IRQ line */ wtimer() { /* If I/O going and not in isr(), simulate interrupt * If no I/O for at least 1 second, stop being a Hog * If I/O done and not a Hog, turn off wtimer() */ if (wtio && !isrlock) isr(); if ((Hogproc == myproc) && Hogtime && (lbolt-Hogtime > HZ)) Hogproc = (struct proc *) 0; if (wtio || (Hogproc == myproc)) timeout(wtimer, (caddr_t) 0, HZ); else wtimeron = 0; } wtrawio(bp) struct buf *bp; { wtstrategy(bp); biowait(bp); return(0); } /* * ioctl routine * for user level QIC commands only */ wtioctl(dev, cmd, arg, mode, p) int dev, cmd; unsigned long arg; int mode; struct proc *p; { if (cmd == WTQICMD) { if ((qicmd((int)arg) == ERROR) || (rdyexc(HZ) == ERROR)) { wtsense(0); return(EIO); } return(0); } return(EINVAL); } /* * open routine * called on every device open */ wtopen(dev, flag) int dev, flag; { if (first_wtopen_ever) { wtinit(); first_wtopen_ever = 0; } #ifdef DEBUG printf("wtopen ...\n"); #endif if (!pageaddr) { return(ENXIO); } if (wtflags & (TPINUSE)) { return(ENXIO); } if (wtflags & (TPDEAD)) { return(EIO); } /* If a rewind from the last session is going on, wait */ while(wtflags & TPREW) { #ifdef DEBUG debug("Waiting for rew to finish\n"); #endif delay(1000000); /* delay one second */ } /* Only do reset and select when tape light is off, and tape is rewound. * This allows multiple volumes. */ if (wtflags & TPSTART) { if (t_reset() != SUCCESS) { return(ENXIO); } #ifdef DEBUG debug("reset done. calling wtsense\n"); #endif if (wtsense(TP_WRP) == ERROR) { return (EIO); } #ifdef DEBUG debug("wtsense done\n"); #endif wtflags &= ~TPSTART; } wtflags = TPINUSE; if (flag & FREAD) wtflags |= TPREAD; if (flag & FWRITE) wtflags |= TPWRITE; rwtbuf.b_flags = 0; myproc = curproc; /* for comparison */ #ifdef not switch(TP_DENS(dev)) { case 0: cmds(0x28); break; case 1: cmds(0x29); break; case 2: cmds(0x27); break; case 3: cmds(0x24); } #endif return(0); } /* * close routine * called on last device close * If not rewind-on-close, leave read or write command intact. */ wtclose(dev) { int wtdsl2(); #ifdef DEBUG debug("WTclose:\n"); #endif if (Hogproc == myproc) Hogproc = (struct proc *) 0; if (!exflag && (wtflags & TPWANY) && !(wtflags & (TPSESS|TPDEAD))) { if (!(wtflags & TPWO)) wstart(); #ifdef DEBUG debug("WT: Writing file mark\n"); #endif wmark(); /* write file mark */ #ifdef DEBUG debug("WT: Wrote file mark, going to wait\n"); #endif if (rdyexc(HZ/10) == ERROR) { wtsense(0); } } if (TP_REWCLOSE(dev) || (wtflags & (TPSESS|TPDEAD))) { /* rewind tape to beginning of tape, deselect tape, and make a note */ /* don't wait until rewind, though */ /* Ending read or write causes rewind to happen, if no error, * and READY and EXCEPTION stay up until it finishes */ if (wtflags & (TPRO|TPWO)) { #ifdef DEBUG debug("End read or write\n"); #endif rdyexc(HZ/10); ioend(); wtflags &= ~(TPRO|TPWO); } else wtwind(); wtflags |= TPSTART | TPREW; timeout(wtdsl2, 0, HZ); } else if (!(wtflags & (TPVOL|TPWANY))) { /* space forward to after next file mark no writing done */ /* This allows skipping data without reading it.*/ #ifdef DEBUG debug("Reading past file mark\n"); #endif if (!(wtflags & TPRO)) rstart(); rmark(); if (rdyexc(HZ/10)) { wtsense(TP_WRP); } } wtflags &= TPREW|TPDEAD|TPSTART|TPRO|TPWO; return(0); } /* return ERROR if user I/O request should receive an I/O error code */ wtsense(ignor) { wtflags &= ~(TPRO|TPWO); #ifdef DEBUGx debug("WTsense: start "); #endif if (rdstatus(&wterror) == ERROR) { #ifdef DEBUG debug("WTsense: Can't read status\n"); #endif return(ERROR); } #ifdef DEBUG if (wterror.wt_err & (TP_ST0|TP_ST1)) { debug("Tperror: status %x error %d underruns %d\n", wterror.wt_err, wterror.wt_ercnt, wterror.wt_urcnt); } else debug("done. no error\n"); #endif wterror.wt_err &= ~ignor; /* ignore certain errors */ reperr(wterror.wt_err); if (((wterror.wt_err & TP_ST0) && (wterror.wt_err & TP_ERR0)) || ((wterror.wt_err & TP_ST1) && (wterror.wt_err & TP_ERR1))) return ERROR; return SUCCESS; } /* lifted from tdriver.c from Wangtek */ reperr(srb0) int srb0; { int s0 = srb0 & (TP_ERR0|TP_ERR1); /* find out which exception to report */ if (s0) { if (s0 & TP_USL) sterr("Drive not online"); else if (s0 & TP_CNI) sterr("No cartridge"); else if ((s0 & TP_WRP) && !(wtflags & TPWP)) { sterr("Tape is write protected"); wtflags |= TPWP; } /* if (s0 & TP_FIL) sterr("Filemark detected"); */ else if (s0 & TP_BNL) sterr("Block in error not located"); else if (s0 & TP_UDA) sterr("Unrecoverable data error"); /* else if (s0 & TP_EOM) sterr("End of tape"); */ else if (s0 & TP_NDT) sterr("No data detected"); /* if (s0 & TP_POR) sterr("Reset occured"); */ else if (s0 & TP_BOM) sterr("Beginning of tape"); else if (s0 & TP_ILL) sterr("Illegal command"); } } sterr(errstr) char *errstr; { printf("Streamer: %s\n", errstr); } /* Wait until rewind finishes, and deselect drive */ wtdsl2() { int stat; stat = inb(wtport) & (READY|EXCEP); #ifdef DEBUG debug("Timeout: Waiting for rewind to finish: stat %x\n", stat); #endif switch (stat) { /* They're active low, ya'know */ case READY|EXCEP: timeout(wtdsl2, (caddr_t) 0, HZ); return; case EXCEP: wtflags &= ~TPREW; return; case READY: case 0: wtflags &= ~TPREW; sterr("Rewind failed"); wtsense(TP_WRP); return; } } wtwind() { #ifdef DEBUG debug("WT: About to rewind\n"); #endif rwind(); /* actually start rewind */ } wtintr(unit) { if (wtflags & (TPWO|TPRO)) { isrlock = 1; if (wtio) isr(); isrlock = 0; } } wtinit() { if (wtchan < 1 || wtchan > 3) { sterr("Bad DMA channel, cannot init driver"); return; } wtlinit(); /* init assembly language variables */ pageset(); } rdyexc(ticks) { int s; #ifdef DEBUG int os = 0xffff; /* force printout first time */ #endif for (;;) { /* loop until ready or exception */ s=(inb(wtport) & 0xff); /* read the status register */ #ifdef DEBUG if (os != s) { debug("Status reg = %x\n", s); /* */ os = s; } #endif if (!(s & EXCEP)) /* check if exception have occured */ break; if (!(s & READY)) /* check if controller is ready */ break; s = splbio(); delay((ticks/HZ)*1000000); /* */ splx(s); } #ifdef DEBUG debug("Status reg = %x on return\n", s); /* */ #endif return((s & EXCEP)?SUCCESS:ERROR); /* return exception if it occured */ } pollrdy() { int sps; #ifdef DEBUG debug("Pollrdy\n"); #endif sps = splbio(); while (wtio) { int error; if (error = tsleep((caddr_t)&wci, WTPRI | PCATCH, "wtpoll", 0)) { splx(sps); return(error); } } splx(sps); #ifdef DEBUG debug("Finish poll, wci %d exflag %d\n", wci, exflag); #endif return (EIO); } wtdma() /* start up i/o operation, called from dma() in wtlib1.s */ { wtio = 1; if (!wtimeron) { wtimeron = 1; timeout(wtimer, (caddr_t) 0, HZ/2); } } wtwake() /* end i/o operation, called from isr() in wtlib1.s */ { wtio = 0; wakeup(&wci); } pageset() { unsigned long pp; pp = (unsigned long) pagebuf; pageaddr = kvtop(pp); #ifdef DEBUG debug("pageset: addr %lx\n", pageaddr); #endif } #define near static near sendcmd() { /* desired command in global mbits */ outb(CTLPORT, mbits | REQUEST); /* set request */ while (inb(STATPORT) & READY); /* wait for ready */ outb(CTLPORT, mbits & ~REQUEST); /* reset request */ while ((inb(STATPORT) & READY) == 0); /* wait for not ready */ } static near /* execute command */ cmds(cmd) { register s; do s = inb(STATPORT); while ((s & STAT) == STAT); /* wait for ready */ if ((s & EXCEP) == 0) /* if exception */ return ERROR; /* error */ outb(CMDPORT, cmd); /* output the command */ outb(CTLPORT, mbits=ONLINE); /* set & send ONLINE */ sendcmd(); return SUCCESS; } qicmd(cmd) { return cmds(cmd); } rstart() { return cmds(RDDATA); } rmark() { return cmds(READFM); } wstart() { return cmds(WRTDATA); } ioend() { register s; register rval = SUCCESS; do s = inb(STATPORT); while ((s & STAT) == STAT); /* wait for ready */ if ((s & EXCEP) == 0) /* if exception */ rval = ERROR; /* error */ mbits &= ~ONLINE; outb(CTLPORT, mbits); /* reset ONLINE */ outb(MASKREG, wtchan+4); /* turn off dma */ outb(CLEARFF, 0); /* reset direction flag */ return rval; } wmark() { register s; if (cmds(WRITEFM) == ERROR) return ERROR; do s = inb(STATPORT); while ((s & STAT) == STAT); /* wait for ready */ if ((s & EXCEP) == 0) /* if exception */ return ERROR; /* error */ return SUCCESS; } rwind() { register s; mbits = CMDOFF; do s = inb(STATPORT); while ((s & STAT) == STAT); /* wait for ready */ outb(CMDPORT, REWIND); sendcmd(); return SUCCESS; } rdstatus(stp) char *stp; /* pointer to 6 byte buffer */ { register s; int n; do s = inb(STATPORT); while ((s & STAT) == STAT); /* wait for ready or exception */ outb(CMDPORT, RDSTAT); sendcmd(); /* send read status command */ for (n=0; n<6; n++) { #ifdef DEBUGx debug("rdstatus: waiting, byte %d\n", n); #endif do s = inb(STATPORT); while ((s & STAT) == STAT); /* wait for ready */ #ifdef DEBUGx debug("rdstatus: done\n"); #endif if ((s & EXCEP) == 0) /* if exception */ return ERROR; /* error */ *stp++ = inb(DATAPORT); /* read status byte */ outb(CTLPORT, mbits | REQUEST); /* set request */ #ifdef DEBUGx debug("rdstatus: waiting after request, byte %d\n", n); #endif while ((inb(STATPORT)&READY) == 0); /* wait for not ready */ for (s=100; s>0; s--); /* wait an additional time */ outb(CTLPORT, mbits & ~REQUEST);/* unset request */ #ifdef DEBUGx debug("rdstatus: done\n"); #endif } return SUCCESS; } t_reset() { register i; mbits |= RESET; outb(CTLPORT, mbits); /* send reset */ delay(20); mbits &= ~RESET; outb(CTLPORT, mbits); /* turn off reset */ if ((inb(STATPORT) & RESETMASK) == RESETVAL) return SUCCESS; return ERROR; } static dma() { int x=splbio(); wtdma(); outb(CLEARFF, 0); outb(MODEREG, mode); /* set dma mode */ outb(dmareg, bufptr & 0xFF); outb(dmareg, (bufptr>>8) & 0xFF); outb(pagereg, (bufptr>>16) & 0xFF); outb(dmareg+1, (BLKSIZE-1) & 0xFF); outb(dmareg+1, (BLKSIZE-1) >> 8); outb(wtport, eqdma+ONLINE); outb(MASKREG, wtchan); /* enable command to 8237, start dma */ splx(x); } static near wtstart(buf, cnt) long buf; int cnt; { register s; bufptr = buf; /* init statics */ numbytes = cnt; wci = 0; /* init flags */ exflag = 0; bytes = 0; /* init counter */ do s = inb(STATPORT) & STAT; while (s == STAT); /* wait for ready or error */ if (s & EXCEP) /* no error */ { dma(); return SUCCESS; } return ERROR; /* error */ } rtape(buf, cnt) long buf; /* physical address */ int cnt; /* number of bytes */ { mode = dma_read; return wtstart(buf,cnt); } wtape(buf, cnt) long buf; /* physical address */ int cnt; /* number of bytes */ { mode = dma_write; return wtstart(buf,cnt); } isr() { int stat = inb(wtport); if (!(stat & EXCEP)) /* exception during I/O */ { if (bytes + BLKSIZE >= numbytes) wci = 1; exflag = 1; goto isrwake; } if ((stat & READY) || !(inb(STATUSREG) & dma_done)) return; exflag = 0; outb(wtport, ONLINE); bytes += BLKSIZE; if (bytes >= numbytes) /* normal completion of I/O */ { wci = 1; isrwake: outb(MASKREG, 4+wtchan); /* turn off dma */ wtwake(); /* wake up user level */ } else { /* continue I/O */ bufptr += BLKSIZE; dma(); } } wtlinit() { switch (wtchan) { case 1: return; case 2: pagereg = 0x81; dma_done = 4; break; case 3: eqdma = 0x10; pagereg = 0x82; dma_done = 8; break; } dma_write = wtchan+0x48; dma_read = wtchan+0x44; dmareg = wtchan+wtchan; } wtsize() { } wtdump() { } #include #include int wtprobe(), wtattach(); struct isa_driver wtdriver = { wtprobe, wtattach, "wt", }; wtprobe(dvp) struct isa_device *dvp; { int val,i,s; #ifdef lint wtintr(0); #endif wtport = dvp->id_iobase; if(t_reset() != SUCCESS) return(0); return(1); } wtattach() { } #endif NWT