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freebsd-dev/sys/i386/isa/wt.c
Poul-Henning Kamp cba8a5ddd3 Make a "DWIM" function for adding [bc]devsw entries for bdev drivers. 
Saves about 280 butes of source per driver, 56 bytes in object size
and another 56 bytes moves from data to bss.

No functional change intended nor expected.

GENERIC should be about one k smaller now :-)
1996-07-23 21:52:43 +00:00

1024 lines
28 KiB
C
Raw Blame History

/*
* Streamer tape driver for 386bsd and FreeBSD.
* 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.
* Authors thank Robert Baron, CMU and Intel and retain here
* the original CMU copyright notice.
*
* Version 1.3, Thu Nov 11 12:09:13 MSK 1993
* $Id: wt.c,v 1.32 1996/04/08 19:40:57 smpatel Exp $
*
*/
/*
* Code for MTERASE added by John Lind (john@starfire.mn.org) 95/09/02.
* This was very easy due to the excellent structure and clear coding
* of the original driver.
*/
/*
* 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/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/proc.h>
#include <sys/devconf.h>
#include <sys/conf.h>
#ifdef DEVFS
#include <sys/devfsext.h>
#endif /*DEVFS*/
#include <vm/vm_param.h>
#include <machine/clock.h>
#include <machine/wtio.h>
#include <i386/isa/isa_device.h>
#include <i386/isa/wtreg.h>
/*
* Uncomment this to enable internal device tracing.
*/
#define TRACE(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 */
};
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 {
enum wttype type; /* type of controller */
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 */
int bsize; /* tape block size */
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;
#ifdef DEVFS
void *devfs_token;
void *devfs_token_r;
#endif
} wtinfo_t;
static wtinfo_t wttab[NWT]; /* tape info by unit number */
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 timeout_t wtimer;
static void wtclock (wtinfo_t *t);
static int wtreset (wtinfo_t *t);
static int wtsense (wtinfo_t *t, int verb, 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, int mask, int bits);
static struct kern_devconf kdc_wt[NWT] = { {
0, 0, 0, /* filled in by dev_attach */
"wt", 0, { MDDT_ISA, 0, "bio" },
isa_generic_externalize, 0, 0, ISA_EXTERNALLEN,
&kdc_isa0, /* parent */
0, /* parentdata */
DC_UNCONFIGURED, /* state */
"Archive or Wangtek QIC-02/QIC-36 tape controller",
DC_CLS_TAPE /* class */
} };
static d_open_t wtopen;
static d_close_t wtclose;
static d_ioctl_t wtioctl;
static d_dump_t wtdump;
static d_psize_t wtsize;
static d_strategy_t wtstrategy;
#define CDEV_MAJOR 10
#define BDEV_MAJOR 3
static struct cdevsw wt_cdevsw;
static struct bdevsw wt_bdevsw =
{ wtopen, wtclose, wtstrategy, wtioctl, /*3*/
wtdump, wtsize, B_TAPE, "wt", &wt_cdevsw, -1 };
static inline void
wt_registerdev(struct isa_device *id)
{
if(id->id_unit)
kdc_wt[id->id_unit] = kdc_wt[0];
kdc_wt[id->id_unit].kdc_unit = id->id_unit;
kdc_wt[id->id_unit].kdc_parentdata = id;
dev_attach(&kdc_wt[id->id_unit]);
}
/*
* Probe for the presence of the device.
*/
static int
wtprobe (struct isa_device *id)
{
wtinfo_t *t = wttab + id->id_unit;
wt_registerdev(id);
t->unit = id->id_unit;
t->chan = id->id_drq;
t->port = id->id_iobase;
if (t->chan<1 || t->chan>3) {
printf ("wt%d: Bad drq=%d, should be 1..3\n", t->unit, t->chan);
return (0);
}
/* Try Wangtek. */
t->type = 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;
if (wtreset (t))
return (WT_NPORT);
/* Try Archive. */
t->type = 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->type = UNKNOWN;
return (0);
}
/*
* Device is found, configure it.
*/
static int
wtattach (struct isa_device *id)
{
wtinfo_t *t = wttab + id->id_unit;
if (t->type == ARCHIVE) {
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 */
kdc_wt[id->id_unit].kdc_state = DC_IDLE;
isa_dmainit(t->chan, 1024);
#ifdef DEVFS
t->devfs_token_r =
devfs_add_devswf(&wt_cdevsw, id->id_unit, DV_CHR, 0, 0,
0600, "rwt%d", id->id_unit);
t->devfs_token =
devfs_add_devswf(&wt_bdevsw, id->id_unit, DV_BLK, 0, 0,
0600, "wt%d", id->id_unit);
#endif
return (1);
}
struct isa_driver wtdriver = { wtprobe, wtattach, "wt", };
int
wtdump (dev_t dev)
{
/* Not implemented */
return (EINVAL);
}
int
wtsize (dev_t dev)
{
/* Not implemented */
return (-1);
}
/*
* Open routine, called on every device open.
*/
int
wtopen (dev_t dev, int flag, int fmt, struct proc *p)
{
int u = minor (dev) & T_UNIT;
wtinfo_t *t = wttab + u;
int error;
if (u >= NWT || t->type == UNKNOWN)
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 */
if (error = wtwait (t, PCATCH, "wtrew"))
return (error);
/* Check the controller status */
if (! wtsense (t, 0, (flag & FWRITE) ? 0 : TP_WRP)) {
/* Bad status, reset the controller */
if (! wtreset (t))
return (EIO);
if (! wtsense (t, 1, (flag & FWRITE) ? 0 : TP_WRP))
return (EIO);
}
/* Set up tape density. */
if (t->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 (t, d))
return (EIO);
if (! wtsense (t, 1, TP_WRP | TP_ILL))
return (EIO);
/* Check the status of the controller. */
if (t->error.err & TP_ILL) {
printf ("wt%d: invalid tape density\n", t->unit);
return (ENODEV);
}
}
t->dens = minor (dev) & WT_DENSEL;
}
t->flags &= ~TPSTART;
} else if (t->dens != (minor (dev) & WT_DENSEL))
return (ENXIO);
t->bsize = (minor (dev) & WT_BSIZE) ? 1024 : 512;
t->buf = malloc (t->bsize, M_TEMP, M_WAITOK);
if (! t->buf)
return (EAGAIN);
if (isa_dma_acquire(t->chan))
return(EBUSY);
t->flags = TPINUSE;
kdc_wt[u].kdc_state = DC_BUSY;
if (flag & FREAD)
t->flags |= TPREAD;
if (flag & FWRITE)
t->flags |= TPWRITE;
return (0);
}
/*
* Close routine, called on last device close.
*/
int
wtclose (dev_t dev, int flags, int fmt, struct proc *p)
{
int u = minor (dev) & T_UNIT;
wtinfo_t *t = wttab + u;
if (u >= NWT || t->type == UNKNOWN)
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) {
if (minor (dev) & T_NOREWIND)
goto done;
/* If read file mark 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;
kdc_wt[u].kdc_state = DC_IDLE;
free (t->buf, M_TEMP);
isa_dma_release(t->chan);
return (0);
}
/*
* Ioctl routine. Compatible with BSD ioctls.
* There are two possible ioctls:
* ioctl (int fd, MTIOCGET, struct mtget *buf) -- get status
* ioctl (int fd, MTIOCTOP, struct mtop *buf) -- do BSD-like op
*/
int
wtioctl (dev_t dev, int cmd, caddr_t arg, int flags, struct proc *p)
{
int u = minor (dev) & T_UNIT;
wtinfo_t *t = wttab + u;
int error, count, op;
if (u >= NWT || t->type == UNKNOWN)
return (ENXIO);
switch (cmd) {
default:
return (EINVAL);
case MTIOCIEOT: /* ignore EOT errors */
case MTIOCEEOT: /* enable EOT errors */
return (0);
case MTIOCGET:
((struct mtget*)arg)->mt_type =
t->type == ARCHIVE ? 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);
case MTRETENS: /* re-tension tape */
if (error = wtwait (t, PCATCH, "wtretens"))
return (error);
op = QIC_RETENS;
goto erase_retens;
case MTERASE: /* erase to EOM */
if (! (t->flags & TPWRITE) || (t->flags & TPWP))
return (EACCES);
if (error = wtwait (t, PCATCH, "wterase"))
return (error);
op = QIC_ERASE;
erase_retens:
/* 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;
t->flags |= TPWANY;
wtclock (t);
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->type == UNKNOWN)
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, 1, TP_WRP)) /* clear status */
goto errxit;
if (! wtcmd (t, QIC_RDDATA)) { /* sed read mode */
wtsense (t, 1, 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, 1, 0)) /* clear status */
goto errxit;
if (! wtcmd (t, QIC_WRTDATA)) { /* set write mode */
wtsense (t, 1, 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->type == UNKNOWN) {
TRACE (("wtintr() -- device not configured\n"));
return;
}
s = inb (t->STATPORT); /* get status */
TRACE (("wtintr() status=0x%x -- ", s));
if ((s & (t->BUSY | t->NOEXCEP)) == (t->BUSY | t->NOEXCEP)) {
TRACE (("busy\n"));
return; /* device is busy */
}
/*
* Check if rewind finished.
*/
if (t->flags & TPREW) {
TRACE (((s & (t->BUSY | t->NOEXCEP)) == (t->BUSY | t->NOEXCEP) ?
"rewind busy?\n" : "rewind finished\n"));
t->flags &= ~TPREW; /* Rewind finished. */
wtsense (t, 1, TP_WRP);
wakeup ((caddr_t)t);
return;
}
/*
* Check if writing/reading of file mark finished.
*/
if (t->flags & (TPRMARK | TPWMARK)) {
TRACE (((s & (t->BUSY | t->NOEXCEP)) == (t->BUSY | t->NOEXCEP) ?
"marker r/w busy?\n" : "marker r/w finished\n"));
if (! (s & t->NOEXCEP)) /* operation failed */
wtsense (t, 1, (t->flags & TPRMARK) ? TP_WRP : 0);
t->flags &= ~(TPRMARK | TPWMARK); /* operation finished */
wakeup ((caddr_t)t);
return;
}
/*
* Do we started any i/o? If no, just return.
*/
if (! (t->flags & TPACTIVE)) {
TRACE (("unexpected interrupt\n"));
return;
}
t->flags &= ~TPACTIVE;
t->dmacount += t->bsize; /* increment counter */
/*
* Clean up dma.
*/
if ((t->dmaflags & B_READ) && (t->dmatotal - t->dmacount) < t->bsize) {
/* If reading short block, copy the internal buffer
* to the user memory. */
isa_dmadone (t->dmaflags, t->buf, t->bsize, t->chan);
bcopy (t->buf, t->dmavaddr, t->dmatotal - t->dmacount);
} else
isa_dmadone (t->dmaflags, t->dmavaddr, t->bsize, t->chan);
/*
* On exception, check for end of file and end of volume.
*/
if (! (s & t->NOEXCEP)) {
TRACE (("i/o exception\n"));
wtsense (t, 1, (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 ((caddr_t)t);
return;
}
if (t->dmacount < t->dmatotal) { /* continue i/o */
t->dmavaddr += t->bsize;
wtdma (t);
TRACE (("continue i/o, %d\n", t->dmacount));
return;
}
if (t->dmacount > t->dmatotal) /* short last block */
t->dmacount = t->dmatotal;
wakeup ((caddr_t)t); /* wake up user level */
TRACE (("i/o finished, %d\n", t->dmacount));
}
/* start the rewind operation */
static void
wtrewind (wtinfo_t *t)
{
int rwmode = (t->flags & (TPRO | TPWO));
t->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 (t->type==WANGTEK && rwmode) {
outb (t->CTLPORT, 0);
} else 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, 1, 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 ((caddr_t)wtwritefm, WTPRI, "wtwfm", hz); /* timeout: 1 second */
t->flags &= ~(TPRO | TPWO);
if (! wtcmd (t, QIC_WRITEFM)) {
wtsense (t, 1, 0);
return (EIO);
}
t->flags |= TPWMARK | TPWANY;
wtclock (t);
return (wtwait (t, 0, "wtwfm"));
}
/* while controller status & mask == bits continue waiting */
static int
wtpoll (wtinfo_t *t, int mask, int bits)
{
int s, i;
/* Poll status port, waiting for specified bits. */
for (i=0; i<1000; ++i) { /* up to 1 msec */
s = inb (t->STATPORT);
if ((s & mask) != bits)
return (s);
DELAY (1);
}
for (i=0; i<100; ++i) { /* up to 10 msec */
s = inb (t->STATPORT);
if ((s & mask) != bits)
return (s);
DELAY (100);
}
for (;;) { /* forever */
s = inb (t->STATPORT);
if ((s & mask) != bits)
return (s);
tsleep ((caddr_t)wtpoll, WTPRI, "wtpoll", 1); /* timeout: 1 tick */
}
}
/* execute QIC command */
static int
wtcmd (wtinfo_t *t, int cmd)
{
int s, x;
TRACE (("wtcmd() cmd=0x%x\n", cmd));
x = splbio();
s = wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP); /* ready? */
if (! (s & t->NOEXCEP)) { /* error */
splx(x);
return (0);
}
outb (t->CMDPORT, cmd); /* output the command */
outb (t->CTLPORT, t->REQUEST | t->ONLINE); /* set request */
wtpoll (t, t->BUSY, t->BUSY); /* wait for ready */
outb (t->CTLPORT, t->IEN | t->ONLINE); /* reset request */
wtpoll (t, t->BUSY, 0); /* wait for not ready */
splx(x);
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;
TRACE (("wtwait() `%s'\n", msg));
while (t->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK))
if (error = tsleep ((caddr_t)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->type == ARCHIVE)
outb (t->SDMAPORT, 0); /* set dma */
if ((t->dmaflags & B_READ) && (t->dmatotal - t->dmacount) < t->bsize)
/* Reading short block. Do it through the internal buffer. */
isa_dmastart (t->dmaflags, t->buf, t->bsize, t->chan);
else
isa_dmastart (t->dmaflags, t->dmavaddr, t->bsize, t->chan);
}
/* start i/o operation */
static int
wtstart (wtinfo_t *t, unsigned flags, void *vaddr, unsigned len)
{
int s, x;
TRACE (("wtstart()\n"));
x = splbio();
s = wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP); /* ready? */
if (! (s & t->NOEXCEP)) {
t->flags |= TPEXCEP; /* error */
splx(x);
return (0);
}
t->flags &= ~TPEXCEP; /* clear exception flag */
t->dmavaddr = vaddr;
t->dmatotal = len;
t->dmacount = 0;
t->dmaflags = flags;
wtdma (t);
splx(x);
return (1);
}
/* start timer */
static void
wtclock (wtinfo_t *t)
{
if (! (t->flags & TPTIMER)) {
t->flags |= TPTIMER;
/* Some controllers seem to lose dma interrupts too often.
* To make the tape stream we need 1 tick timeout. */
timeout (wtimer, (caddr_t)t, (t->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.
*/
static void
wtimer (void *xt)
{
wtinfo_t *t = (wtinfo_t *)xt;
int s;
t->flags &= ~TPTIMER;
if (! (t->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK)))
return;
/* If i/o going, simulate interrupt. */
s = splbio ();
if ((inb (t->STATPORT) & (t->BUSY | t->NOEXCEP)) != (t->BUSY | t->NOEXCEP)) {
TRACE (("wtimer() -- "));
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)
{
/* Perform QIC-02 and QIC-36 compatible reset sequence. */
/* Thanks to Mikael Hybsch <micke@dynas.se>. */
int s, i;
outb (t->CTLPORT, t->RESET | t->ONLINE); /* send reset */
DELAY (30);
outb (t->CTLPORT, t->ONLINE); /* turn off reset */
DELAY (30);
/* Read the controller status. */
s = inb (t->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 & t->BUSY) || ! (s & t->NOEXCEP))
break;
DELAY (1000);
s = inb (t->STATPORT);
}
return ((s & t->RESETMASK) == t->RESETVAL);
}
/* 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 verb, int ignor)
{
char *msg = 0;
int err;
TRACE (("wtsense() ignor=0x%x\n", ignor));
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);
if (! verb)
return (0);
/* 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;
int x;
x = splbio();
wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP); /* ready? */
outb (t->CMDPORT, QIC_RDSTAT); /* send `read status' command */
outb (t->CTLPORT, t->REQUEST | t->ONLINE); /* set request */
wtpoll (t, t->BUSY, t->BUSY); /* wait for ready */
outb (t->CTLPORT, t->ONLINE); /* reset request */
wtpoll (t, t->BUSY, 0); /* wait for not ready */
p = (char*) &t->error;
while (p < (char*)&t->error + 6) {
int s = wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP);
if (! (s & t->NOEXCEP)) { /* error */
splx(x);
return (0);
}
*p++ = inb (t->DATAPORT); /* read status byte */
outb (t->CTLPORT, t->REQUEST | t->ONLINE); /* set request */
wtpoll (t, t->BUSY, 0); /* wait for not ready */
DELAY(20);
outb (t->CTLPORT, t->ONLINE); /* unset request */
}
splx(x);
return (1);
}
static wt_devsw_installed = 0;
static void
wt_drvinit(void *unused)
{
if( ! wt_devsw_installed ) {
bdevsw_add_generic(BDEV_MAJOR,CDEV_MAJOR, &wt_bdevsw);
wt_devsw_installed = 1;
}
}
SYSINIT(wtdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,wt_drvinit,NULL)
#endif /* NWT */
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