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- /*-
- * 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.
- *
- * @(#)wt.c 7.1 (Berkeley) 5/9/91
- */
-
- /*
- *
- * 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
- /*
- * HISTORY
- * $Log: wt.c,v $
- * Revision 2.2.1.3 90/01/08 13:29:38 rvb
- * Add Intel copyright.
- * [90/01/08 rvb]
- *
- * Revision 2.2.1.2 89/12/21 18:00:09 rvb
- * Change WTPRI to make the streamer tape read/write
- * interruptible. [lin]
- *
- * Revision 2.2.1.1 89/11/10 09:49:49 rvb
- * ORC likes their streamer port at 0x288.
- * [89/11/08 rvb]
- *
- * Revision 2.2 89/09/25 12:33:02 rvb
- * Driver was provided by Intel 9/18/89.
- * [89/09/23 rvb]
- *
- */
-
- /*
- *
- * Copyright 1988, 1989 by Intel Corporation
- *
- * Support Bell Tech QIC-02 and WANGTEK QIC-36 or QIC-02
- */
-
- /*#include <sys/errno.h>
- #include <sys/signal.h>
- #include <sys/types.h>*/
- #include "sys/param.h"
- #include "sys/buf.h"
- #include "sys/file.h"
- #include "sys/proc.h"
- #include "sys/user.h"
- #include "i386/isa/wtreg.h"
-
- #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;
- ucnt2 = 0;
- adr2 = 0;
- #ifdef DEBUG
- debug("WTstart: adr1 %lx cnt %x\n", adr1, ucnt1);
- #endif
- if (ftoseg(adr1) != ftoseg(adr1 + (unsigned) ucnt1 - 1))
- {
- adr2 = (adr1 & 0xffff0000L) + 0x10000L;
- ucnt2 = (adr1 + ucnt1) - adr2;
- ucnt1 -= ucnt2;
- }
- /* 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);
- }
-
- wt_minphys(bp)
- struct buf *bp;
- {
- if (bp->b_bcount > PAGESIZ)
- bp->b_bcount = PAGESIZ;
- }
-
- /*
- * raw read routine
- */
- wtread(dev, uio)
- struct uio *uio;
- {
- if (wtflags & TPSESS) {
- return(EIO);
- }
- physio(wtrawio, &rwtbuf, dev, B_READ, wt_minphys, uio);
- return(0);
- }
-
- /*
- * raw write routine
- */
- wtwrite(dev, uio)
- struct uio *uio;
- {
- if (wtflags & TPSESS) {
- return(EIO);
- }
- physio(wtrawio, &rwtbuf, dev, B_WRITE, wt_minphys, uio);
- return(0);
- }
-
-
-
- /*
- * ioctl routine
- * for user level QIC commands only
- */
- wtioctl(dev, cmd, arg, mode)
- int dev, cmd;
- unsigned long arg;
- int mode;
- {
- 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 */
- switch(TP_DENS(dev)) {
- case 0:
- cmds(0x28);
- break;
- case 1:
- cmds(0x29);
- break;
- case 2:
- cmds(0x27);
- break;
- case 3:
- cmds(0x24);
- }
- 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;
- }
-
- /*
- * delay i microseconds
- */
- delay(i)
- register int i;
- {
- while (i-- > 0)
- DELAY(1000);
- }
-
- wtsize()
- {
- }
-
- wtdump()
- {
- }
-
- #include "i386/isa/isa_device.h"
- #include "i386/isa/icu.h"
-
- 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
-