/* * Streamer tape driver for 386bsd and FreeBSD. * Supports Archive and Wangtek compatible QIC-02/QIC-36 boards. * * Copyright (C) 1993 by: * Sergey Ryzhkov * Serge Vakulenko * * 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 1.45 1998/07/04 22:30:19 julian 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 "opt_devfs.h" #include #include #include #include #include #include #include #include #ifdef DEVFS #include #endif /*DEVFS*/ #include #include #include /* * 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_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 ointhand2_t wtintr; 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 d_open_t wtopen; static d_read_t wtread; static d_write_t wtwrite; 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 = { wtopen, wtclose, wtread, wtwrite, wtioctl, nostop, nullreset, nodevtotty, seltrue, nommap, wtstrategy, "wt", NULL, -1 }; /* * Probe for the presence of the device. */ static 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 = 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; id->id_ointr = wtintr; if (t->type == ARCHIVE) { printf ("wt%d: type \n", t->unit); outb (t->RDMAPORT, 0); /* reset dma */ } else printf ("wt%d: type \n", t->unit); t->flags = TPSTART; /* tape is rewound */ t->dens = -1; /* unknown density */ 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); #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; 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; 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, u_long 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); } static int wtread(dev_t dev, struct uio *uio, int ioflag) { return (physio(wtstrategy, NULL, dev, 1, minphys, uio)); } static int wtwrite(dev_t dev, struct uio *uio, int ioflag) { return (physio(wtstrategy, NULL, dev, 0, minphys, uio)); } /* * 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) { bp->b_error = ENXIO; goto err2xit; } /* at file marks and end of tape, we just return '0 bytes available' */ if (t->flags & TPVOL) goto xit; if (bp->b_bcount % t->bsize != 0) { bp->b_error = EINVAL; goto err2xit; } 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_data, 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_error = EIO; err2xit: bp->b_flags |= B_ERROR; } xit: biodone (bp); return; } /* * Interrupt routine. */ static 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; } /* * 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); t->flags &= ~TPACTIVE; t->dmacount += t->bsize; t->dmavaddr = (char *)t->dmavaddr + t->bsize; /* * 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 */ 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 . */ 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 ) { dev_t dev; dev = makedev(CDEV_MAJOR, 0); cdevsw_add(&dev, &wt_cdevsw, NULL); wt_devsw_installed = 1; } } SYSINIT(wtdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,wt_drvinit,NULL) #endif /* NWT */