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This is the Linux generic soundcard driver, version 1.0c. Supports
[unix-history] / sys / i386 / isa / wt.c
/*
* Streamer tape driver for 386bsd and FreeBSD.
* Supports Archive QIC-02 and Wangtek QIC-02/QIC-36 boards.
*
* Copyright (C) 1993 by:
* Sergey Ryzhkov <sir@kiae.su>
* Serge Vakulenko <vak@zebub.msk.su>
*
* Placed in the public domain with NO WARRANTIES, not even the implied
* warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* Authors grant any other persons or organisations permission to use
* or modify this software as long as this message is kept with the software,
* all derivative works or modified versions.
*
* This driver is derived from the old 386bsd Wangtek streamer tape driver,
* made by Robert Baron at CMU, based on Intel sources.
* Authors thank Robert Baron, CMU and Intel and retain here
* the original CMU copyright notice.
*
* from: Version 1.1, Fri Sep 24 02:14:31 MSD 1993
* $Id$
*/
/*
* 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
#include "sys/param.h"
#include "sys/buf.h"
#include "sys/fcntl.h"
#include "sys/malloc.h"
#include "sys/ioctl.h"
#include "sys/mtio.h"
#include "vm/vm_param.h"
#include "i386/include/pio.h"
#include "i386/isa/isa_device.h"
#include "i386/isa/wtreg.h"
#define WTPRI (PZERO+10) /* sleep priority */
#define BLKSIZE 512 /* streamer tape block size */
/*
* Wangtek controller ports
*/
#define WT_CTLPORT(base) ((base)+0) /* control, write only */
#define WT_STATPORT(base) ((base)+0) /* status, read only */
#define WT_CMDPORT(base) ((base)+1) /* command, write only */
#define WT_DATAPORT(base) ((base)+1) /* data, read only */
#define WT_NPORT 2 /* 2 i/o ports */
/* status port bits */
#define WT_BUSY 0x01 /* not ready bit define */
#define WT_NOEXCEP 0x02 /* no exception bit define */
#define WT_RESETMASK 0x07 /* to check after reset */
#define WT_RESETVAL 0x05 /* state after reset */
/* control port bits */
#define WT_ONLINE 0x01 /* device selected */
#define WT_RESET 0x02 /* reset command */
#define WT_REQUEST 0x04 /* request command */
#define WT_IEN(chan) ((chan)>2 ? 0x10 : 0x8) /* enable intr */
/*
* Archive controller ports
*/
#define AV_DATAPORT(base) ((base)+0) /* data, read only */
#define AV_CMDPORT(base) ((base)+0) /* command, write only */
#define AV_STATPORT(base) ((base)+1) /* status, read only */
#define AV_CTLPORT(base) ((base)+1) /* control, write only */
#define AV_SDMAPORT(base) ((base)+2) /* start dma */
#define AV_RDMAPORT(base) ((base)+3) /* reset dma */
#define AV_NPORT 4 /* 4 i/o ports */
/* status port bits */
#define AV_BUSY 0x40 /* not ready bit define */
#define AV_NOEXCEP 0x20 /* no exception bit define */
#define AV_RESETMASK 0xf8 /* to check after reset */
#define AV_RESETVAL 0x50 /* state after reset */
/* control port bits */
#define AV_RESET 0x80 /* reset command */
#define AV_REQUEST 0x40 /* request command */
#define AV_IEN 0x20 /* enable interrupts */
#define DMA_STATUSREG 0x8
#define DMA_DONE(chan) (1 << (chan))
typedef struct {
unsigned short err; /* code for error encountered */
unsigned short ercnt; /* number of error blocks */
unsigned short urcnt; /* number of underruns */
} wtstatus_t;
typedef struct {
unsigned unit; /* unit number */
unsigned port; /* base i/o port */
unsigned chan; /* dma channel number, 1..3 */
unsigned flags; /* state of tape drive */
unsigned dens; /* tape density */
void *buf; /* internal i/o buffer */
void *dmavaddr; /* virtual address of dma i/o buffer */
unsigned dmatotal; /* size of i/o buffer */
unsigned dmaflags; /* i/o direction, B_READ or B_WRITE */
unsigned dmacount; /* resulting length of dma i/o */
wtstatus_t error; /* status of controller */
unsigned short DATAPORT, CMDPORT, STATPORT, CTLPORT, SDMAPORT, RDMAPORT;
unsigned char BUSY, NOEXCEP, RESETMASK, RESETVAL;
unsigned char ONLINE, RESET, REQUEST, IEN;
} wtinfo_t;
wtinfo_t wttab[NWT]; /* tape info by unit number */
extern int hz; /* number of ticks per second */
static int wtwait (wtinfo_t *t, int catch, char *msg);
static int wtcmd (wtinfo_t *t, int cmd);
static int wtstart (wtinfo_t *t, unsigned mode, void *vaddr, unsigned len);
static void wtdma (wtinfo_t *t);
static void wtimer (wtinfo_t *t);
static void wtclock (wtinfo_t *t);
static int wtreset (wtinfo_t *t);
static int wtsense (wtinfo_t *t, int ignor);
static int wtstatus (wtinfo_t *t);
static void wtrewind (wtinfo_t *t);
static int wtreadfm (wtinfo_t *t);
static int wtwritefm (wtinfo_t *t);
static int wtpoll (wtinfo_t *t);
extern void DELAY (int usec);
extern void bcopy (void *from, void *to, unsigned len);
extern void isa_dmastart (int flags, void *addr, unsigned len, unsigned chan);
extern void isa_dmadone (int flags, void *addr, unsigned len, int chan);
extern void printf (char *str, ...);
extern int splbio (void);
extern int splx (int level);
extern void timeout (void (*func) (), void *arg, int timo);
extern int tsleep (void *chan, int priority, char *msg, int timo);
extern void wakeup (void *chan);
/*
* Probe for the presence of the device.
*/
int wtprobe (struct isa_device *id)
{
wtinfo_t *t = wttab + id->id_unit;
t->unit = id->id_unit;
t->chan = id->id_drq;
t->port = 0; /* Mark it as not configured. */
if (t->chan<1 || t->chan>3) {
printf ("wt%d: Bad drq=%d, should be 1..3\n", t->unit, t->chan);
return (0);
}
t->port = id->id_iobase;
/* Try Wangtek. */
t->CTLPORT = WT_CTLPORT (t->port); t->STATPORT = WT_STATPORT (t->port);
t->CMDPORT = WT_CMDPORT (t->port); t->DATAPORT = WT_DATAPORT (t->port);
t->SDMAPORT = 0; t->RDMAPORT = 0;
t->BUSY = WT_BUSY; t->NOEXCEP = WT_NOEXCEP;
t->RESETMASK = WT_RESETMASK; t->RESETVAL = WT_RESETVAL;
t->ONLINE = WT_ONLINE; t->RESET = WT_RESET;
t->REQUEST = WT_REQUEST; t->IEN = WT_IEN (t->chan);
if (wtreset (t))
return (WT_NPORT);
/* Try Archive. */
t->CTLPORT = AV_CTLPORT (t->port); t->STATPORT = AV_STATPORT (t->port);
t->CMDPORT = AV_CMDPORT (t->port); t->DATAPORT = AV_DATAPORT (t->port);
t->SDMAPORT = AV_SDMAPORT (t->port); t->RDMAPORT = AV_RDMAPORT (t->port);
t->BUSY = AV_BUSY; t->NOEXCEP = AV_NOEXCEP;
t->RESETMASK = AV_RESETMASK; t->RESETVAL = AV_RESETVAL;
t->ONLINE = 0; t->RESET = AV_RESET;
t->REQUEST = AV_REQUEST; t->IEN = AV_IEN;
if (wtreset (t))
return (AV_NPORT);
/* Tape controller not found. */
t->port = 0;
return (0);
}
/*
* Device is found, configure it.
*/
int wtattach (struct isa_device *id)
{
wtinfo_t *t = wttab + id->id_unit;
if (t->RDMAPORT) {
printf ("wt%d: type <Archive>\n", t->unit);
outb (t->RDMAPORT, 0); /* reset dma */
} else
printf ("wt%d: type <Wangtek>\n", t->unit);
t->flags = TPSTART; /* tape is rewound */
t->dens = -1; /* unknown density */
t->buf = malloc (BLKSIZE, M_TEMP, M_NOWAIT);
return (1);
}
struct isa_driver wtdriver = { wtprobe, wtattach, "wt", };
int wtdump (int dev)
{
/* Not implemented */
return (EINVAL);
}
int wtsize (int dev)
{
/* Not implemented */
return (-1);
}
/*
* Open routine, called on every device open.
*/
int wtopen (int dev, int flag)
{
int u = minor (dev) & T_UNIT;
wtinfo_t *t = wttab + u;
int error;
if (u >= NWT || !t->port)
return (ENXIO);
/* Check that device is not in use */
if (t->flags & TPINUSE)
return (EBUSY);
/* If the tape is in rewound state, check the status and set density. */
if (t->flags & TPSTART) {
/* If rewind is going on, wait */
error = wtwait (t, PCATCH, "wtrew");
if (error)
return (error);
if (! wtsense (t, (flag & FWRITE) ? 0 : TP_WRP)) {
/* Bad status. Reset the controller. */
if (! wtreset (t))
return (ENXIO);
if (! wtsense (t, (flag & FWRITE) ? 0 : TP_WRP))
return (ENXIO);
}
/* Set up tape density. */
if (t->dens != (minor (dev) & T_DENSEL)) {
int d;
switch (minor (dev) & T_DENSEL) {
default:
case T_800BPI: d = QIC_FMT150; break; /* minor 000 */
case T_1600BPI: d = QIC_FMT120; break; /* minor 010 */
case T_6250BPI: d = QIC_FMT24; break; /* minor 020 */
case T_BADBPI: d = QIC_FMT11; break; /* minor 030 */
}
if (! wtcmd (t, d))
return (ENXIO);
/* Check the status of the controller. */
if (! wtsense (t, (flag & FWRITE) ? 0 : TP_WRP))
return (ENXIO);
t->dens = minor (dev) & T_DENSEL;
}
t->flags &= ~TPSTART;
} else if (t->dens != (minor (dev) & T_DENSEL))
return (ENXIO);
t->flags = TPINUSE;
if (flag & FREAD)
t->flags |= TPREAD;
if (flag & FWRITE)
t->flags |= TPWRITE;
return (0);
}
/*
* Close routine, called on last device close.
*/
int wtclose (int dev)
{
int u = minor (dev) & T_UNIT;
wtinfo_t *t = wttab + u;
if (u >= NWT || !t->port)
return (ENXIO);
/* If rewind is pending, do nothing */
if (t->flags & TPREW)
goto done;
/* If seek forward is pending and no rewind on close, do nothing */
if ((t->flags & TPRMARK) && (minor (dev) & T_NOREWIND))
goto done;
/* If file mark read is going on, wait */
wtwait (t, 0, "wtrfm");
if (t->flags & TPWANY)
/* Tape was written. Write file mark. */
wtwritefm (t);
if (! (minor (dev) & T_NOREWIND)) {
/* Rewind tape to beginning of tape. */
/* Don't wait until rewind, though. */
wtrewind (t);
goto done;
}
if ((t->flags & TPRANY) && ! (t->flags & (TPVOL | TPWANY)))
/* Space forward to after next file mark if no writing done. */
/* Don't wait for completion. */
wtreadfm (t);
done:
t->flags &= TPREW | TPRMARK | TPSTART | TPTIMER;
return (0);
}
/*
* Ioctl routine. Compatible with BSD ioctls.
* Direct QIC-02 commands ERASE and RETENSION added.
* There are three possible ioctls:
* ioctl (int fd, MTIOCGET, struct mtget *buf) -- get status
* ioctl (int fd, MTIOCTOP, struct mtop *buf) -- do BSD-like op
* ioctl (int fd, WTQICMD, int qicop) -- do QIC op
*/
int wtioctl (int dev, int cmd, void *arg, int mode)
{
int u = minor (dev) & T_UNIT;
wtinfo_t *t = wttab + u;
int error, count, op;
if (u >= NWT || !t->port)
return (ENXIO);
switch (cmd) {
default:
return (EINVAL);
case WTQICMD: /* direct QIC command */
op = (int) *(void**)arg;
switch (op) {
default:
return (EINVAL);
case QIC_ERASE: /* erase the whole tape */
if (! (t->flags & TPWRITE) || (t->flags & TPWP))
return (EACCES);
if (error = wtwait (t, PCATCH, "wterase"))
return (error);
break;
case QIC_RETENS: /* retension the tape */
if (error = wtwait (t, PCATCH, "wtretens"))
return (error);
break;
}
/* Both ERASE and RETENS operations work like REWIND. */
/* Simulate the rewind operation here. */
t->flags &= ~(TPRO | TPWO | TPVOL);
if (! wtcmd (t, op))
return (EIO);
t->flags |= TPSTART | TPREW;
if (op == QIC_ERASE)
t->flags |= TPWANY;
wtclock (t);
return (0);
case MTIOCIEOT: /* ignore EOT errors */
case MTIOCEEOT: /* enable EOT errors */
return (0);
case MTIOCGET:
((struct mtget*)arg)->mt_type = t->RDMAPORT ? MT_ISVIPER1 : 0x11;
((struct mtget*)arg)->mt_dsreg = t->flags; /* status */
((struct mtget*)arg)->mt_erreg = t->error.err; /* errors */
((struct mtget*)arg)->mt_resid = 0;
((struct mtget*)arg)->mt_fileno = 0; /* file */
((struct mtget*)arg)->mt_blkno = 0; /* block */
return (0);
case MTIOCTOP:
break;
}
switch ((short) ((struct mtop*)arg)->mt_op) {
default:
case MTFSR: /* forward space record */
case MTBSR: /* backward space record */
case MTBSF: /* backward space file */
break;
case MTNOP: /* no operation, sets status only */
case MTCACHE: /* enable controller cache */
case MTNOCACHE: /* disable controller cache */
return (0);
case MTREW: /* rewind */
case MTOFFL: /* rewind and put the drive offline */
if (t->flags & TPREW) /* rewind is running */
return (0);
if (error = wtwait (t, PCATCH, "wtorew"))
return (error);
wtrewind (t);
return (0);
case MTFSF: /* forward space file */
for (count=((struct mtop*)arg)->mt_count; count>0; --count) {
if (error = wtwait (t, PCATCH, "wtorfm"))
return (error);
if (error = wtreadfm (t))
return (error);
}
return (0);
case MTWEOF: /* write an end-of-file record */
if (! (t->flags & TPWRITE) || (t->flags & TPWP))
return (EACCES);
if (error = wtwait (t, PCATCH, "wtowfm"))
return (error);
if (error = wtwritefm (t))
return (error);
return (0);
}
return (EINVAL);
}
/*
* Strategy routine.
*/
void wtstrategy (struct buf *bp)
{
int u = minor (bp->b_dev) & T_UNIT;
wtinfo_t *t = wttab + u;
int s;
bp->b_resid = bp->b_bcount;
if (u >= NWT || !t->port)
goto errxit;
/* at file marks and end of tape, we just return '0 bytes available' */
if (t->flags & TPVOL)
goto xit;
if (bp->b_flags & B_READ) {
/* Check read access and no previous write to this tape. */
if (! (t->flags & TPREAD) || (t->flags & TPWANY))
goto errxit;
/* For now, we assume that all data will be copied out */
/* If read command outstanding, just skip down */
if (! (t->flags & TPRO)) {
if (! wtsense (t, TP_WRP)) /* clear status */
goto errxit;
if (! wtcmd (t, QIC_RDDATA)) { /* sed read mode */
wtsense (t, TP_WRP);
goto errxit;
}
t->flags |= TPRO | TPRANY;
}
} else {
/* Check write access and write protection. */
/* No previous read from this tape allowed. */
if (! (t->flags & TPWRITE) || (t->flags & (TPWP | TPRANY)))
goto errxit;
/* If write command outstanding, just skip down */
if (! (t->flags & TPWO)) {
if (! wtsense (t, 0)) /* clear status */
goto errxit;
if (! wtcmd (t, QIC_WRTDATA)) { /* set write mode */
wtsense (t, 0);
goto errxit;
}
t->flags |= TPWO | TPWANY;
}
}
if (! bp->b_bcount)
goto xit;
t->flags &= ~TPEXCEP;
s = splbio ();
if (wtstart (t, bp->b_flags, bp->b_un.b_addr, bp->b_bcount)) {
wtwait (t, 0, (bp->b_flags & B_READ) ? "wtread" : "wtwrite");
bp->b_resid -= t->dmacount;
}
splx (s);
if (t->flags & TPEXCEP) {
errxit: bp->b_flags |= B_ERROR;
bp->b_error = EIO;
}
xit: biodone (bp);
return;
}
/*
* Interrupt routine.
*/
void wtintr (int u)
{
wtinfo_t *t = wttab + u;
unsigned char s;
if (u >= NWT || !t->port)
return;
s = inb (t->STATPORT); /* get status */
if ((s & (t->BUSY | t->NOEXCEP)) == (t->BUSY | t->NOEXCEP))
return; /* device is busy */
outb (t->CTLPORT, t->ONLINE); /* stop controller */
/*
* Check if rewind finished.
*/
if (t->flags & TPREW) {
t->flags &= ~TPREW; /* Rewind finished. */
wtsense (t, TP_WRP);
wakeup (t);
return;
}
/*
* Check if writing/reading of file mark finished.
*/
if (t->flags & (TPRMARK | TPWMARK)) {
if (! (s & t->NOEXCEP)) /* Operation failed. */
wtsense (t, (t->flags & TPRMARK) ? TP_WRP : 0);
t->flags &= ~(TPRMARK | TPWMARK); /* Operation finished. */
wakeup (t);
return;
}
/*
* Do we started any i/o? If no, just return.
*/
if (! (t->flags & TPACTIVE))
return;
t->flags &= ~TPACTIVE;
if (inb (DMA_STATUSREG) & DMA_DONE (t->chan)) /* if dma finished */
t->dmacount += BLKSIZE; /* increment counter */
/*
* Clean up dma.
*/
if ((t->dmaflags & B_READ) && (t->dmatotal - t->dmacount) < BLKSIZE) {
/* If the address crosses 64-k boundary, or reading short block,
* copy the internal buffer to the user memory. */
isa_dmadone (t->dmaflags, t->buf, BLKSIZE, t->chan);
bcopy (t->buf, t->dmavaddr, t->dmatotal - t->dmacount);
} else
isa_dmadone (t->dmaflags, t->dmavaddr, BLKSIZE, t->chan);
/*
* On exception, check for end of file and end of volume.
*/
if (! (s & t->NOEXCEP)) {
wtsense (t, (t->dmaflags & B_READ) ? TP_WRP : 0);
if (t->error.err & (TP_EOM | TP_FIL))
t->flags |= TPVOL; /* end of file */
else
t->flags |= TPEXCEP; /* i/o error */
wakeup (t);
return;
}
if (t->dmacount < t->dmatotal) { /* continue i/o */
t->dmavaddr += BLKSIZE;
wtdma (t);
return;
}
if (t->dmacount > t->dmatotal) /* short last block */
t->dmacount = t->dmatotal;
wakeup (t); /* wake up user level */
}
/* start the rewind operation */
static void wtrewind (wtinfo_t *t)
{
t->flags &= ~(TPRO | TPWO | TPVOL);
if (! wtcmd (t, QIC_REWIND))
return;
t->flags |= TPSTART | TPREW;
wtclock (t);
}
/* start the `read marker' operation */
static int wtreadfm (wtinfo_t *t)
{
t->flags &= ~(TPRO | TPWO | TPVOL);
if (! wtcmd (t, QIC_READFM)) {
wtsense (t, TP_WRP);
return (EIO);
}
t->flags |= TPRMARK | TPRANY;
wtclock (t);
/* Don't wait for completion here. */
return (0);
}
/* write marker to the tape */
static int wtwritefm (wtinfo_t *t)
{
tsleep (wtwritefm, WTPRI, "wtwfm", hz); /* timeout: 1 second */
t->flags &= ~(TPRO | TPWO);
if (! wtcmd (t, QIC_WRITEFM)) {
wtsense (t, 0);
return (EIO);
}
t->flags |= TPWMARK | TPWANY;
wtclock (t);
return (wtwait (t, 0, "wtwfm"));
}
/* wait for controller ready or exception */
static int wtpoll (wtinfo_t *t)
{
int s, NOTREADY = t->BUSY | t->NOEXCEP;
/* Poll status port, waiting for ready or exception. */
do s = inb (t->STATPORT);
while ((s & NOTREADY) == NOTREADY);
return (s);
}
/* execute QIC command */
static int wtcmd (wtinfo_t *t, int cmd)
{
if (! (wtpoll (t) & t->NOEXCEP)) /* wait for ready */
return (0); /* error */
outb (t->CMDPORT, cmd); /* output the command */
outb (t->CTLPORT, t->REQUEST | t->ONLINE); /* set request */
while (inb (t->STATPORT) & t->BUSY) /* wait for ready */
continue;
outb (t->CTLPORT, t->IEN | t->ONLINE); /* reset request */
while (! (inb (t->STATPORT) & t->BUSY)) /* wait for not ready */
continue;
return (1);
}
/* wait for the end of i/o, seeking marker or rewind operation */
static int wtwait (wtinfo_t *t, int catch, char *msg)
{
int error;
while (t->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK))
if (error = tsleep (t, WTPRI | catch, msg, 0))
return (error);
return (0);
}
/* initialize dma for the i/o operation */
static void wtdma (wtinfo_t *t)
{
t->flags |= TPACTIVE;
wtclock (t);
if (t->SDMAPORT)
outb (t->SDMAPORT, 0); /* set dma */
if ((t->dmaflags & B_READ) && (t->dmatotal - t->dmacount) < BLKSIZE)
/* Reading short block. Do it through the internal buffer. */
isa_dmastart (t->dmaflags, t->buf, BLKSIZE, t->chan);
else
isa_dmastart (t->dmaflags, t->dmavaddr, BLKSIZE, t->chan);
outb (t->CTLPORT, t->IEN | t->ONLINE);
}
/* start i/o operation */
static int wtstart (wtinfo_t *t, unsigned flags, void *vaddr, unsigned len)
{
if (! (wtpoll (t) & t->NOEXCEP)) { /* wait for ready or error */
t->flags |= TPEXCEP; /* error */
return (0);
}
t->flags &= ~TPEXCEP; /* clear exception flag */
t->dmavaddr = vaddr;
t->dmatotal = len;
t->dmacount = 0;
t->dmaflags = flags;
wtdma (t);
return (1);
}
/* start timer */
static void wtclock (wtinfo_t *t)
{
if (! (t->flags & TPTIMER)) {
t->flags |= TPTIMER;
timeout (wtimer, t, hz);
}
}
/*
* 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.
*/
static void wtimer (wtinfo_t *t)
{
int s;
t->flags &= ~TPTIMER;
if (! (t->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK)))
return;
/* If i/o going, simulate interrupt. */
s = splbio ();
wtintr (t->unit);
splx (s);
/* Restart timer if i/o pending. */
if (t->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK))
wtclock (t);
}
/* reset the controller */
static int wtreset (wtinfo_t *t)
{
outb (t->CTLPORT, t->RESET); /* send reset */
DELAY (25);
outb (t->CTLPORT, 0); /* turn off reset */
if ((inb (t->STATPORT) & t->RESETMASK) != t->RESETVAL)
return (0);
return (1);
}
/* get controller status information */
/* return 0 if user i/o request should receive an i/o error code */
static int wtsense (wtinfo_t *t, int ignor)
{
char *msg = 0;
int err;
t->flags &= ~(TPRO | TPWO);
if (! wtstatus (t))
return (0);
if (! (t->error.err & TP_ST0))
t->error.err &= ~TP_ST0MASK;
if (! (t->error.err & TP_ST1))
t->error.err &= ~TP_ST1MASK;
t->error.err &= ~ignor; /* ignore certain errors */
err = t->error.err & (TP_FIL | TP_BNL | TP_UDA | TP_EOM | TP_WRP |
TP_USL | TP_CNI | TP_MBD | TP_NDT | TP_ILL);
if (! err)
return (1);
/* lifted from tdriver.c from Wangtek */
if (err & TP_USL) msg = "Drive not online";
else if (err & TP_CNI) msg = "No cartridge";
else if ((err & TP_WRP) && !(t->flags & TPWP)) {
msg = "Tape is write protected";
t->flags |= TPWP;
}
else if (err & TP_FIL) msg = 0 /*"Filemark detected"*/;
else if (err & TP_EOM) msg = 0 /*"End of tape"*/;
else if (err & TP_BNL) msg = "Block not located";
else if (err & TP_UDA) msg = "Unrecoverable data error";
else if (err & TP_NDT) msg = "No data detected";
else if (err & TP_ILL) msg = "Illegal command";
if (msg)
printf ("wt%d: %s\n", t->unit, msg);
return (0);
}
/* get controller status information */
static int wtstatus (wtinfo_t *t)
{
char *p;
wtpoll (t); /* wait for ready or exception */
outb (t->CMDPORT, QIC_RDSTAT); /* send `read status' command */
outb (t->CTLPORT, t->REQUEST | t->ONLINE); /* set request */
while (inb (t->STATPORT) & t->BUSY) /* wait for ready */
continue;
outb (t->CTLPORT, t->ONLINE); /* reset request */
while (! (inb (t->STATPORT) & t->BUSY)) /* wait for not ready */
continue;
p = (char*) &t->error;
while (p < (char*)&t->error + 6) {
if (! (wtpoll (t) & t->NOEXCEP)) /* wait for ready */
return (0); /* error */
*p++ = inb (t->DATAPORT); /* read status byte */
outb (t->CTLPORT, t->REQUEST); /* set request */
while (! (inb (t->STATPORT) & t->BUSY)) /* wait for not ready */
continue;
/* DELAY (50); */ /* wait 50 usec */
outb (t->CTLPORT, 0); /* unset request */
}
return (1);
}
#endif /* NWT */
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.