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NetBSD/sys/dev/isa/wt.c
mycroft a69dd750a2 b_un.b_addr -> b_data
1994-06-16 01:07:30 +00:00

1029 lines
25 KiB
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/*
* Streamer tape driver.
* Supports Archive and Wangtek compatible QIC-02/QIC-36 boards.
*
* Copyright (C) 1993 by:
* Sergey Ryzhkov <sir@kiae.su>
* Serge Vakulenko <vak@zebub.msk.su>
*
* This software is distributed 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.
*
* $Id: wt.c,v 1.16 1994/06/16 01:08:37 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.
*/
/*
* Copyright 1988, 1989 by Intel Corporation
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/buf.h>
#include <sys/fcntl.h>
#include <sys/malloc.h>
#include <sys/ioctl.h>
#include <sys/mtio.h>
#include <sys/device.h>
#include <vm/vm_param.h>
#include <machine/pio.h>
#include <i386/isa/isavar.h>
#include <i386/isa/dmavar.h>
#include <i386/isa/wtreg.h>
/*
* Uncomment this to enable internal device tracing.
*/
#define DEBUG(s) /* printf s */
#define WTPRI (PZERO+10) /* sleep priority */
/*
* 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 0x08 /* enable dma */
/*
* 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 */
enum wttype {
UNKNOWN = 0, /* unknown type, driver disabled */
ARCHIVE, /* Archive Viper SC499, SC402 etc */
WANGTEK, /* Wangtek */
};
struct wt_softc {
struct device sc_dev;
struct intrhand sc_ih;
enum wttype type; /* type of controller */
u_short sc_iobase; /* base i/o port */
unsigned chan; /* dma channel number, 1..3 */
int flags; /* state of tape drive */
unsigned dens; /* tape density */
int bsize; /* tape block size */
void *buf; /* internal i/o buffer */
void *dmavaddr; /* virtual address of dma i/o buffer */
size_t dmatotal; /* size of i/o buffer */
int dmaflags; /* i/o direction, B_READ or B_WRITE */
size_t dmacount; /* resulting length of dma i/o */
u_short error; /* code for error encountered */
u_short ercnt; /* number of error blocks */
u_short urcnt; /* number of underruns */
u_short DATAPORT, CMDPORT, STATPORT, CTLPORT, SDMAPORT, RDMAPORT;
u_char BUSY, NOEXCEP, RESETMASK, RESETVAL, ONLINE, RESET, REQUEST, IEN;
};
int wtwait __P((struct wt_softc *sc, int catch, char *msg));
int wtcmd __P((struct wt_softc *sc, int cmd));
int wtstart __P((struct wt_softc *sc, int flag, void *vaddr, size_t len));
void wtdma __P((struct wt_softc *sc));
void wttimer __P((void *arg));
void wtclock __P((struct wt_softc *sc));
int wtreset __P((struct wt_softc *sc));
int wtsense __P((struct wt_softc *sc, int verbose, int ignore));
int wtstatus __P((struct wt_softc *sc));
void wtrewind __P((struct wt_softc *sc));
int wtreadfm __P((struct wt_softc *sc));
int wtwritefm __P((struct wt_softc *sc));
u_char wtpoll __P((struct wt_softc *sc, int mask, int bits));
int wtprobe();
void wtattach();
int wtintr __P((struct wt_softc *sc));
struct cfdriver wtcd = {
NULL, "wt", wtprobe, wtattach, DV_TAPE, sizeof(struct wt_softc)
};
/*
* Probe for the presence of the device.
*/
int
wtprobe(parent, self, aux)
struct device *parent, *self;
void *aux;
{
struct wt_softc *sc = (void *)self;
struct isa_attach_args *ia = aux;
u_short iobase;
sc->chan = ia->ia_drq;
sc->sc_iobase = iobase = ia->ia_iobase;
if (sc->chan < 1 || sc->chan > 3) {
printf("%s: Bad drq=%d, should be 1..3\n", sc->sc_dev.dv_xname,
sc->chan);
return 0;
}
/* Try Wangtek. */
sc->type = WANGTEK;
sc->CTLPORT = WT_CTLPORT(iobase);
sc->STATPORT = WT_STATPORT(iobase);
sc->CMDPORT = WT_CMDPORT(iobase);
sc->DATAPORT = WT_DATAPORT(iobase);
sc->SDMAPORT = sc->RDMAPORT = 0;
sc->BUSY = WT_BUSY; sc->NOEXCEP = WT_NOEXCEP;
sc->RESETMASK = WT_RESETMASK; sc->RESETVAL = WT_RESETVAL;
sc->ONLINE = WT_ONLINE; sc->RESET = WT_RESET;
sc->REQUEST = WT_REQUEST; sc->IEN = WT_IEN;
if (wtreset(sc)) {
ia->ia_iosize = WT_NPORT;
return 1;
}
/* Try Archive. */
sc->type = ARCHIVE;
sc->CTLPORT = AV_CTLPORT(iobase);
sc->STATPORT = AV_STATPORT(iobase);
sc->CMDPORT = AV_CMDPORT(iobase);
sc->DATAPORT = AV_DATAPORT(iobase);
sc->SDMAPORT = AV_SDMAPORT(iobase);
sc->RDMAPORT = AV_RDMAPORT(iobase);
sc->BUSY = AV_BUSY; sc->NOEXCEP = AV_NOEXCEP;
sc->RESETMASK = AV_RESETMASK; sc->RESETVAL = AV_RESETVAL;
sc->ONLINE = 0; sc->RESET = AV_RESET;
sc->REQUEST = AV_REQUEST; sc->IEN = AV_IEN;
if (wtreset(sc)) {
ia->ia_iosize = AV_NPORT;
return 1;
}
/* Tape controller not found. */
sc->type = UNKNOWN;
return 0;
}
/*
* Device is found, configure it.
*/
void
wtattach(parent, self, aux)
struct device *parent, *self;
void *aux;
{
struct wt_softc *sc = (void *)self;
struct isa_attach_args *ia = aux;
if (sc->type == ARCHIVE) {
printf(": type <Archive>\n");
/* Reset DMA. */
outb(sc->RDMAPORT, 0);
} else
printf(": type <Wangtek>\n");
sc->flags = TPSTART; /* tape is rewound */
sc->dens = -1; /* unknown density */
sc->sc_ih.ih_fun = wtintr;
sc->sc_ih.ih_arg = sc;
sc->sc_ih.ih_level = IPL_BIO;
intr_establish(ia->ia_irq, &sc->sc_ih);
}
int
wtdump(dev)
dev_t dev;
{
/* Not implemented. */
return EINVAL;
}
int
wtsize(dev)
dev_t dev;
{
/* Not implemented. */
return -1;
}
/*
* Open routine, called on every device open.
*/
int
wtopen(dev, flag)
dev_t dev;
int flag;
{
int unit = minor(dev) & T_UNIT;
struct wt_softc *sc;
int error;
if (unit >= wtcd.cd_ndevs)
return ENXIO;
sc = wtcd.cd_devs[unit];
if (!sc)
return ENXIO;
/* Check that device is not in use */
if (sc->flags & TPINUSE)
return EBUSY;
/* If the tape is in rewound state, check the status and set density. */
if (sc->flags & TPSTART) {
/* If rewind is going on, wait */
if (error = wtwait(sc, PCATCH, "wtrew"))
return error;
/* Check the controller status */
if (!wtsense(sc, 0, (flag & FWRITE) ? 0 : TP_WRP)) {
/* Bad status, reset the controller. */
if (!wtreset(sc))
return EIO;
if (!wtsense(sc, 1, (flag & FWRITE) ? 0 : TP_WRP))
return EIO;
}
/* Set up tape density. */
if (sc->dens != (minor(dev) & WT_DENSEL)) {
int d = 0;
switch (minor(dev) & WT_DENSEL) {
case WT_DENSDFLT:
default:
break; /* default density */
case WT_QIC11:
d = QIC_FMT11; break; /* minor 010 */
case WT_QIC24:
d = QIC_FMT24; break; /* minor 020 */
case WT_QIC120:
d = QIC_FMT120; break; /* minor 030 */
case WT_QIC150:
d = QIC_FMT150; break; /* minor 040 */
case WT_QIC300:
d = QIC_FMT300; break; /* minor 050 */
case WT_QIC600:
d = QIC_FMT600; break; /* minor 060 */
}
if (d) {
/* Change tape density. */
if (!wtcmd(sc, d))
return EIO;
if (!wtsense(sc, 1, TP_WRP | TP_ILL))
return EIO;
/* Check the status of the controller. */
if (sc->error & TP_ILL) {
printf("%s: invalid tape density\n",
sc->sc_dev.dv_xname);
return ENODEV;
}
}
sc->dens = minor(dev) & WT_DENSEL;
}
sc->flags &= ~TPSTART;
} else if (sc->dens != (minor(dev) & WT_DENSEL))
return ENXIO;
sc->bsize = (minor(dev) & WT_BSIZE) ? 1024 : 512;
sc->buf = malloc(sc->bsize, M_TEMP, M_WAITOK);
sc->flags = TPINUSE;
if (flag & FREAD)
sc->flags |= TPREAD;
if (flag & FWRITE)
sc->flags |= TPWRITE;
return 0;
}
/*
* Close routine, called on last device close.
*/
int
wtclose(dev)
dev_t dev;
{
int unit = minor(dev) & T_UNIT;
struct wt_softc *sc = wtcd.cd_devs[unit];
/* If rewind is pending, do nothing */
if (sc->flags & TPREW)
goto done;
/* If seek forward is pending and no rewind on close, do nothing */
if (sc->flags & TPRMARK) {
if (minor(dev) & T_NOREWIND)
goto done;
/* If read file mark is going on, wait */
wtwait(sc, 0, "wtrfm");
}
if (sc->flags & TPWANY) {
/* Tape was written. Write file mark. */
wtwritefm(sc);
}
if ((minor(dev) & T_NOREWIND) == 0) {
/* Rewind to beginning of tape. */
/* Don't wait until rewind, though. */
wtrewind(sc);
goto done;
}
if ((sc->flags & TPRANY) && (sc->flags & (TPVOL | TPWANY)) == 0) {
/* Space forward to after next file mark if no writing done. */
/* Don't wait for completion. */
wtreadfm(sc);
}
done:
sc->flags &= TPREW | TPRMARK | TPSTART | TPTIMER;
free(sc->buf, M_TEMP);
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(dev, cmd, addr, flag)
dev_t dev;
int cmd;
void *addr;
int flag;
{
int unit = minor(dev) & T_UNIT;
struct wt_softc *sc = wtcd.cd_devs[unit];
int error, count, op;
switch (cmd) {
default:
return EINVAL;
case WTQICMD: /* direct QIC command */
op = *(int *)addr;
switch (op) {
default:
return EINVAL;
case QIC_ERASE: /* erase the whole tape */
if ((sc->flags & TPWRITE) == 0 || (sc->flags & TPWP))
return EACCES;
if (error = wtwait(sc, PCATCH, "wterase"))
return error;
break;
case QIC_RETENS: /* retension the tape */
if (error = wtwait(sc, PCATCH, "wtretens"))
return error;
break;
}
/* Both ERASE and RETENS operations work like REWIND. */
/* Simulate the rewind operation here. */
sc->flags &= ~(TPRO | TPWO | TPVOL);
if (!wtcmd(sc, op))
return EIO;
sc->flags |= TPSTART | TPREW;
if (op == QIC_ERASE)
sc->flags |= TPWANY;
wtclock(sc);
return 0;
case MTIOCIEOT: /* ignore EOT errors */
case MTIOCEEOT: /* enable EOT errors */
return 0;
case MTIOCGET:
((struct mtget*)addr)->mt_type =
sc->type == ARCHIVE ? MT_ISVIPER1 : 0x11;
((struct mtget*)addr)->mt_dsreg = sc->flags; /* status */
((struct mtget*)addr)->mt_erreg = sc->error; /* errors */
((struct mtget*)addr)->mt_resid = 0;
((struct mtget*)addr)->mt_fileno = 0; /* file */
((struct mtget*)addr)->mt_blkno = 0; /* block */
return 0;
case MTIOCTOP:
break;
}
switch ((short)((struct mtop*)addr)->mt_op) {
default:
#if 0
case MTFSR: /* forward space record */
case MTBSR: /* backward space record */
case MTBSF: /* backward space file */
#endif
return EINVAL;
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 (sc->flags & TPREW) /* rewind is running */
return 0;
if (error = wtwait(sc, PCATCH, "wtorew"))
return error;
wtrewind(sc);
return 0;
case MTFSF: /* forward space file */
for (count = ((struct mtop*)addr)->mt_count; count > 0;
--count) {
if (error = wtwait(sc, PCATCH, "wtorfm"))
return error;
if (error = wtreadfm(sc))
return error;
}
return 0;
case MTWEOF: /* write an end-of-file record */
if ((sc->flags & TPWRITE) == 0 || (sc->flags & TPWP))
return EACCES;
if (error = wtwait(sc, PCATCH, "wtowfm"))
return error;
if (error = wtwritefm(sc))
return error;
return 0;
}
#ifdef DIAGNOSTIC
panic("wtioctl: impossible");
#endif
}
/*
* Strategy routine.
*/
void
wtstrategy(bp)
struct buf *bp;
{
int unit = minor(bp->b_dev) & T_UNIT;
struct wt_softc *sc = wtcd.cd_devs[unit];
int s;
bp->b_resid = bp->b_bcount;
/* at file marks and end of tape, we just return '0 bytes available' */
if (sc->flags & TPVOL)
goto xit;
if (bp->b_flags & B_READ) {
/* Check read access and no previous write to this tape. */
if ((sc->flags & TPREAD) == 0 || (sc->flags & TPWANY))
goto errxit;
/* For now, we assume that all data will be copied out */
/* If read command outstanding, just skip down */
if ((sc->flags & TPRO) == 0) {
if (!wtsense(sc, 1, TP_WRP)) {
/* Clear status. */
goto errxit;
}
if (!wtcmd(sc, QIC_RDDATA)) {
/* Set read mode. */
wtsense(sc, 1, TP_WRP);
goto errxit;
}
sc->flags |= TPRO | TPRANY;
}
} else {
/* Check write access and write protection. */
/* No previous read from this tape allowed. */
if ((sc->flags & TPWRITE) == 0 || (sc->flags & (TPWP | TPRANY)))
goto errxit;
/* If write command outstanding, just skip down */
if ((sc->flags & TPWO) == 0) {
if (!wtsense(sc, 1, 0)) {
/* Clear status. */
goto errxit;
}
if (!wtcmd(sc, QIC_WRTDATA)) {
/* Set write mode. */
wtsense(sc, 1, 0);
goto errxit;
}
sc->flags |= TPWO | TPWANY;
}
}
if (bp->b_bcount == 0)
goto xit;
sc->flags &= ~TPEXCEP;
s = splbio();
if (wtstart(sc, bp->b_flags, bp->b_data, bp->b_bcount)) {
wtwait(sc, 0, (bp->b_flags & B_READ) ? "wtread" : "wtwrite");
bp->b_resid -= sc->dmacount;
}
splx(s);
if (sc->flags & TPEXCEP) {
errxit:
bp->b_flags |= B_ERROR;
bp->b_error = EIO;
}
xit:
biodone(bp);
return;
}
/*
* Interrupt routine.
*/
int
wtintr(sc)
struct wt_softc *sc;
{
u_char s;
s = inb(sc->STATPORT); /* get status */
DEBUG(("wtintr() status=0x%x -- ", s));
if ((s & (sc->BUSY | sc->NOEXCEP)) == (sc->BUSY | sc->NOEXCEP)) {
DEBUG(("busy\n"));
return 0; /* device is busy */
}
/*
* Check if rewind finished.
*/
if (sc->flags & TPREW) {
DEBUG(((s & (sc->BUSY | sc->NOEXCEP)) == (sc->BUSY | sc->NOEXCEP) ?
"rewind busy?\n" : "rewind finished\n"));
sc->flags &= ~TPREW; /* rewind finished */
wtsense(sc, 1, TP_WRP);
wakeup((caddr_t)sc);
return 1;
}
/*
* Check if writing/reading of file mark finished.
*/
if (sc->flags & (TPRMARK | TPWMARK)) {
DEBUG(((s & (sc->BUSY | sc->NOEXCEP)) == (sc->BUSY | sc->NOEXCEP) ?
"marker r/w busy?\n" : "marker r/w finished\n"));
if ((s & sc->NOEXCEP) == 0) /* operation failed */
wtsense(sc, 1, (sc->flags & TPRMARK) ? TP_WRP : 0);
sc->flags &= ~(TPRMARK | TPWMARK); /* operation finished */
wakeup((caddr_t)sc);
return 1;
}
/*
* Do we started any i/o? If no, just return.
*/
if ((sc->flags & TPACTIVE) == 0) {
DEBUG(("unexpected interrupt\n"));
return 0;
}
sc->flags &= ~TPACTIVE;
sc->dmacount += sc->bsize; /* increment counter */
/*
* Clean up dma.
*/
if ((sc->dmaflags & B_READ) &&
(sc->dmatotal - sc->dmacount) < sc->bsize) {
/* If reading short block, copy the internal buffer
* to the user memory. */
isa_dmadone(sc->dmaflags, sc->buf, sc->bsize, sc->chan);
bcopy(sc->buf, sc->dmavaddr, sc->dmatotal - sc->dmacount);
} else
isa_dmadone(sc->dmaflags, sc->dmavaddr, sc->bsize, sc->chan);
/*
* On exception, check for end of file and end of volume.
*/
if ((s & sc->NOEXCEP) == 0) {
DEBUG(("i/o exception\n"));
wtsense(sc, 1, (sc->dmaflags & B_READ) ? TP_WRP : 0);
if (sc->error & (TP_EOM | TP_FIL))
sc->flags |= TPVOL; /* end of file */
else
sc->flags |= TPEXCEP; /* i/o error */
wakeup((caddr_t)sc);
return 1;
}
if (sc->dmacount < sc->dmatotal) {
/* Continue I/O. */
sc->dmavaddr += sc->bsize;
wtdma(sc);
DEBUG(("continue i/o, %d\n", sc->dmacount));
return 1;
}
if (sc->dmacount > sc->dmatotal) /* short last block */
sc->dmacount = sc->dmatotal;
/* Wake up user level. */
wakeup((caddr_t)sc);
DEBUG(("i/o finished, %d\n", sc->dmacount));
return 1;
}
/* start the rewind operation */
void
wtrewind(sc)
struct wt_softc *sc;
{
int rwmode = sc->flags & (TPRO | TPWO);
sc->flags &= ~(TPRO | TPWO | TPVOL);
/*
* Wangtek strictly follows QIC-02 standard:
* clearing ONLINE in read/write modes causes rewind.
* REWIND command is not allowed in read/write mode
* and gives `illegal command' error.
*/
if (sc->type == WANGTEK && rwmode) {
outb(sc->CTLPORT, 0);
} else if (!wtcmd(sc, QIC_REWIND))
return;
sc->flags |= TPSTART | TPREW;
wtclock(sc);
}
/*
* Start the `read marker' operation.
*/
int
wtreadfm(sc)
struct wt_softc *sc;
{
sc->flags &= ~(TPRO | TPWO | TPVOL);
if (!wtcmd(sc, QIC_READFM)) {
wtsense(sc, 1, TP_WRP);
return EIO;
}
sc->flags |= TPRMARK | TPRANY;
wtclock(sc);
/* Don't wait for completion here. */
return 0;
}
/*
* Write marker to the tape.
*/
int
wtwritefm(sc)
struct wt_softc *sc;
{
tsleep((caddr_t)wtwritefm, WTPRI, "wtwfm", hz);
sc->flags &= ~(TPRO | TPWO);
if (!wtcmd(sc, QIC_WRITEFM)) {
wtsense(sc, 1, 0);
return EIO;
}
sc->flags |= TPWMARK | TPWANY;
wtclock(sc);
return wtwait(sc, 0, "wtwfm");
}
/*
* While controller status & mask == bits continue waiting.
*/
u_char
wtpoll(sc, mask, bits)
struct wt_softc *sc;
int mask, bits;
{
u_char s;
int i;
/* Poll status port, waiting for specified bits. */
for (i = 0; i < 1000; ++i) { /* up to 1 msec */
s = inb(sc->STATPORT);
if ((s & mask) != bits)
return s;
delay(1);
}
for (i = 0; i < 100; ++i) { /* up to 10 msec */
s = inb(sc->STATPORT);
if ((s & mask) != bits)
return s;
delay(100);
}
for (;;) { /* forever */
s = inb(sc->STATPORT);
if ((s & mask) != bits)
return s;
tsleep((caddr_t)wtpoll, WTPRI, "wtpoll", 1);
}
}
/*
* Execute QIC command.
*/
int
wtcmd(sc, cmd)
struct wt_softc *sc;
int cmd;
{
u_char s;
DEBUG(("wtcmd() cmd=0x%x\n", cmd));
s = wtpoll(sc, sc->BUSY | sc->NOEXCEP, sc->BUSY | sc->NOEXCEP); /* ready? */
if ((s & sc->NOEXCEP) == 0) /* error */
return 0;
outb(sc->CMDPORT, cmd); /* output the command */
outb(sc->CTLPORT, sc->REQUEST | sc->ONLINE); /* set request */
wtpoll(sc, sc->BUSY, sc->BUSY); /* wait for ready */
outb(sc->CTLPORT, sc->IEN | sc->ONLINE); /* reset request */
wtpoll(sc, sc->BUSY, 0); /* wait for not ready */
return 1;
}
/* wait for the end of i/o, seeking marker or rewind operation */
int
wtwait(sc, catch, msg)
struct wt_softc *sc;
int catch;
char *msg;
{
int error;
DEBUG(("wtwait() `%s'\n", msg));
while (sc->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK))
if (error = tsleep((caddr_t)sc, WTPRI | catch, msg, 0))
return error;
return 0;
}
/* initialize dma for the i/o operation */
void
wtdma(sc)
struct wt_softc *sc;
{
sc->flags |= TPACTIVE;
wtclock(sc);
if (sc->type == ARCHIVE) {
/* Set DMA. */
outb(sc->SDMAPORT, 0);
}
if ((sc->dmaflags & B_READ) &&
(sc->dmatotal - sc->dmacount) < sc->bsize) {
/* Reading short block; do it through the internal buffer. */
isa_dmastart(sc->dmaflags, sc->buf, sc->bsize, sc->chan);
} else
isa_dmastart(sc->dmaflags, sc->dmavaddr, sc->bsize, sc->chan);
}
/* start i/o operation */
int
wtstart(sc, flag, vaddr, len)
struct wt_softc *sc;
int flag;
void *vaddr;
size_t len;
{
u_char s;
DEBUG(("wtstart()\n"));
s = wtpoll(sc, sc->BUSY | sc->NOEXCEP, sc->BUSY | sc->NOEXCEP); /* ready? */
if ((s & sc->NOEXCEP) == 0) {
sc->flags |= TPEXCEP; /* error */
return 0;
}
sc->flags &= ~TPEXCEP; /* clear exception flag */
sc->dmavaddr = vaddr;
sc->dmatotal = len;
sc->dmacount = 0;
sc->dmaflags = flag;
wtdma(sc);
return 1;
}
/*
* Start timer.
*/
void
wtclock(sc)
struct wt_softc *sc;
{
if (sc->flags & TPTIMER)
return;
sc->flags |= TPTIMER;
/*
* Some controllers seem to lose dma interrupts too often. To make the
* tape stream we need 1 tick timeout.
*/
timeout(wttimer, sc, (sc->flags & TPACTIVE) ? 1 : 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.
*/
void
wttimer(arg)
void *arg;
{
struct wt_softc *sc = (struct wt_softc *)arg;
int s;
sc->flags &= ~TPTIMER;
if ((sc->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK)) == 0)
return;
/* If i/o going, simulate interrupt. */
s = splbio();
if ((inb(sc->STATPORT) & (sc->BUSY | sc->NOEXCEP)) != (sc->BUSY | sc->NOEXCEP)) {
DEBUG(("wttimer() -- "));
wtintr(sc);
}
splx(s);
/* Restart timer if i/o pending. */
if (sc->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK))
wtclock(sc);
}
/*
* Perform QIC-02 and QIC-36 compatible reset sequence.
*/
int
wtreset(sc)
struct wt_softc *sc;
{
u_char s;
int i;
outb(sc->CTLPORT, sc->RESET | sc->ONLINE); /* send reset */
delay(30);
outb(sc->CTLPORT, sc->ONLINE); /* turn off reset */
delay(30);
/* Read the controller status. */
s = inb(sc->STATPORT);
if (s == 0xff) /* no port at this address? */
return 0;
/* Wait 3 sec for reset to complete. Needed for QIC-36 boards? */
for (i = 0; i < 3000; ++i) {
if ((s & sc->BUSY) == 0 || (s & sc->NOEXCEP) == 0)
break;
delay(1000);
s = inb(sc->STATPORT);
}
return (s & sc->RESETMASK) == sc->RESETVAL;
}
/*
* Get controller status information. Return 0 if user i/o request should
* receive an i/o error code.
*/
int
wtsense(sc, verbose, ignore)
struct wt_softc *sc;
int verbose, ignore;
{
char *msg = 0;
int error;
DEBUG(("wtsense() ignore=0x%x\n", ignore));
sc->flags &= ~(TPRO | TPWO);
if (!wtstatus(sc))
return 0;
if ((sc->error & TP_ST0) == 0)
sc->error &= ~TP_ST0MASK;
if ((sc->error & TP_ST1) == 0)
sc->error &= ~TP_ST1MASK;
sc->error &= ~ignore; /* ignore certain errors */
error = sc->error & (TP_FIL | TP_BNL | TP_UDA | TP_EOM | TP_WRP |
TP_USL | TP_CNI | TP_MBD | TP_NDT | TP_ILL);
if (!error)
return 1;
if (!verbose)
return 0;
/* lifted from tdriver.c from Wangtek */
if (error & TP_USL)
msg = "Drive not online";
else if (error & TP_CNI)
msg = "No cartridge";
else if ((error & TP_WRP) && (sc->flags & TPWP) == 0) {
msg = "Tape is write protected";
sc->flags |= TPWP;
} else if (error & TP_FIL)
msg = 0 /*"Filemark detected"*/;
else if (error & TP_EOM)
msg = 0 /*"End of tape"*/;
else if (error & TP_BNL)
msg = "Block not located";
else if (error & TP_UDA)
msg = "Unrecoverable data error";
else if (error & TP_NDT)
msg = "No data detected";
else if (error & TP_ILL)
msg = "Illegal command";
if (msg)
printf("%s: %s\n", sc->sc_dev.dv_xname, msg);
return 0;
}
/*
* Get controller status information.
*/
int
wtstatus(sc)
struct wt_softc *sc;
{
char *p;
wtpoll(sc, sc->BUSY | sc->NOEXCEP, sc->BUSY | sc->NOEXCEP); /* ready? */
outb(sc->CMDPORT, QIC_RDSTAT); /* send `read status' command */
outb(sc->CTLPORT, sc->REQUEST | sc->ONLINE); /* set request */
wtpoll(sc, sc->BUSY, sc->BUSY); /* wait for ready */
outb(sc->CTLPORT, sc->ONLINE); /* reset request */
wtpoll(sc, sc->BUSY, 0); /* wait for not ready */
p = (char *)&sc->error;
while (p < (char *)&sc->error + 6) {
u_char s = wtpoll(sc, sc->BUSY | sc->NOEXCEP, sc->BUSY | sc->NOEXCEP);
if ((s & sc->NOEXCEP) == 0) /* error */
return 0;
*p++ = inb(sc->DATAPORT); /* read status byte */
outb(sc->CTLPORT, sc->REQUEST | sc->ONLINE); /* set request */
wtpoll(sc, sc->BUSY, 0); /* wait for not ready */
outb(sc->CTLPORT, sc->ONLINE); /* unset request */
}
return 1;
}
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