The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/i386/isa/wt.c

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    1 
    2 /*
    3  * Streamer tape driver for 386bsd and FreeBSD.
    4  * Supports Archive and Wangtek compatible QIC-02/QIC-36 boards.
    5  *
    6  * Copyright (C) 1993 by:
    7  *      Sergey Ryzhkov       <sir@kiae.su>
    8  *      Serge Vakulenko      <vak@zebub.msk.su>
    9  *
   10  * This software is distributed with NO WARRANTIES, not even the implied
   11  * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   12  *
   13  * Authors grant any other persons or organisations permission to use
   14  * or modify this software as long as this message is kept with the software,
   15  * all derivative works or modified versions.
   16  *
   17  * This driver is derived from the old 386bsd Wangtek streamer tape driver,
   18  * made by Robert Baron at CMU, based on Intel sources.
   19  * Authors thank Robert Baron, CMU and Intel and retain here
   20  * the original CMU copyright notice.
   21  *
   22  * Version 1.3, Thu Nov 11 12:09:13 MSK 1993
   23  * $FreeBSD$
   24  *
   25  */
   26 
   27 /*
   28  * Code for MTERASE added by John Lind (john@starfire.mn.org) 95/09/02.
   29  * This was very easy due to the excellent structure and clear coding
   30  * of the original driver.
   31  */
   32 
   33 /*
   34  * Copyright (c) 1989 Carnegie-Mellon University.
   35  * All rights reserved.
   36  *
   37  * Authors: Robert Baron
   38  *
   39  * Permission to use, copy, modify and distribute this software and
   40  * its documentation is hereby granted, provided that both the copyright
   41  * notice and this permission notice appear in all copies of the
   42  * software, derivative works or modified versions, and any portions
   43  * thereof, and that both notices appear in supporting documentation.
   44  *
   45  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   46  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
   47  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   48  *
   49  * Carnegie Mellon requests users of this software to return to
   50  *
   51  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   52  *  School of Computer Science
   53  *  Carnegie Mellon University
   54  *  Pittsburgh PA 15213-3890
   55  *
   56  * any improvements or extensions that they make and grant Carnegie the
   57  * rights to redistribute these changes.
   58  */
   59 
   60 #include "wt.h"
   61 #if NWT > 0
   62 
   63 #include "opt_devfs.h"
   64 
   65 #include <sys/param.h>
   66 #include <sys/systm.h>
   67 #include <sys/kernel.h>
   68 #include <sys/buf.h>
   69 #include <sys/fcntl.h>
   70 #include <sys/malloc.h>
   71 #include <sys/mtio.h>
   72 #include <sys/conf.h>
   73 #ifdef DEVFS
   74 #include <sys/devfsext.h>
   75 #endif /*DEVFS*/
   76 
   77 #include <machine/clock.h>
   78 
   79 #include <i386/isa/isa_device.h>
   80 #include <i386/isa/wtreg.h>
   81 
   82 
   83 /*
   84  * Uncomment this to enable internal device tracing.
   85  */
   86 #define TRACE(s)                /* printf s */
   87 
   88 #define WTPRI                   (PZERO+10)      /* sleep priority */
   89 
   90 /*
   91  * Wangtek controller ports
   92  */
   93 #define WT_CTLPORT(base)        ((base)+0)      /* control, write only */
   94 #define WT_STATPORT(base)       ((base)+0)      /* status, read only */
   95 #define WT_CMDPORT(base)        ((base)+1)      /* command, write only */
   96 #define WT_DATAPORT(base)       ((base)+1)      /* data, read only */
   97 #define WT_NPORT                2               /* 2 i/o ports */
   98 
   99 /* status port bits */
  100 #define WT_BUSY                 0x01            /* not ready bit define */
  101 #define WT_NOEXCEP              0x02            /* no exception bit define */
  102 #define WT_RESETMASK            0x07            /* to check after reset */
  103 #define WT_RESETVAL             0x05            /* state after reset */
  104 
  105 /* control port bits */
  106 #define WT_ONLINE               0x01            /* device selected */
  107 #define WT_RESET                0x02            /* reset command */
  108 #define WT_REQUEST              0x04            /* request command */
  109 #define WT_IEN                  0x08            /* enable dma */
  110 
  111 /*
  112  * Archive controller ports
  113  */
  114 #define AV_DATAPORT(base)       ((base)+0)      /* data, read only */
  115 #define AV_CMDPORT(base)        ((base)+0)      /* command, write only */
  116 #define AV_STATPORT(base)       ((base)+1)      /* status, read only */
  117 #define AV_CTLPORT(base)        ((base)+1)      /* control, write only */
  118 #define AV_SDMAPORT(base)       ((base)+2)      /* start dma */
  119 #define AV_RDMAPORT(base)       ((base)+3)      /* reset dma */
  120 #define AV_NPORT                4               /* 4 i/o ports */
  121 
  122 /* status port bits */
  123 #define AV_BUSY                 0x40            /* not ready bit define */
  124 #define AV_NOEXCEP              0x20            /* no exception bit define */
  125 #define AV_RESETMASK            0xf8            /* to check after reset */
  126 #define AV_RESETVAL             0x50            /* state after reset */
  127 
  128 /* control port bits */
  129 #define AV_RESET                0x80            /* reset command */
  130 #define AV_REQUEST              0x40            /* request command */
  131 #define AV_IEN                  0x20            /* enable interrupts */
  132 
  133 enum wttype {
  134         UNKNOWN = 0,                    /* unknown type, driver disabled */
  135         ARCHIVE,                        /* Archive Viper SC499, SC402 etc */
  136         WANGTEK                         /* Wangtek */
  137 };
  138 
  139 typedef struct {
  140         unsigned short err;             /* code for error encountered */
  141         unsigned short ercnt;           /* number of error blocks */
  142         unsigned short urcnt;           /* number of underruns */
  143 } wtstatus_t;
  144 
  145 typedef struct {
  146         enum wttype type;               /* type of controller */
  147         unsigned unit;                  /* unit number */
  148         unsigned port;                  /* base i/o port */
  149         unsigned chan;                  /* dma channel number, 1..3 */
  150         unsigned flags;                 /* state of tape drive */
  151         unsigned dens;                  /* tape density */
  152         int bsize;                      /* tape block size */
  153         void *buf;                      /* internal i/o buffer */
  154 
  155         void *dmavaddr;                 /* virtual address of dma i/o buffer */
  156         unsigned dmatotal;              /* size of i/o buffer */
  157         unsigned dmaflags;              /* i/o direction, B_READ or B_WRITE */
  158         unsigned dmacount;              /* resulting length of dma i/o */
  159 
  160         wtstatus_t error;               /* status of controller */
  161 
  162         unsigned short DATAPORT, CMDPORT, STATPORT, CTLPORT, SDMAPORT, RDMAPORT;
  163         unsigned char BUSY, NOEXCEP, RESETMASK, RESETVAL;
  164         unsigned char ONLINE, RESET, REQUEST, IEN;
  165 #ifdef  DEVFS
  166         void    *devfs_token_r;
  167 #endif
  168 } wtinfo_t;
  169 
  170 static wtinfo_t wttab[NWT];                    /* tape info by unit number */
  171 
  172 static int wtwait (wtinfo_t *t, int catch, char *msg);
  173 static int wtcmd (wtinfo_t *t, int cmd);
  174 static int wtstart (wtinfo_t *t, unsigned mode, void *vaddr, unsigned len);
  175 static void wtdma (wtinfo_t *t);
  176 static timeout_t wtimer;
  177 static void wtclock (wtinfo_t *t);
  178 static int wtreset (wtinfo_t *t);
  179 static int wtsense (wtinfo_t *t, int verb, int ignor);
  180 static int wtstatus (wtinfo_t *t);
  181 static ointhand2_t wtintr;
  182 static void wtrewind (wtinfo_t *t);
  183 static int wtreadfm (wtinfo_t *t);
  184 static int wtwritefm (wtinfo_t *t);
  185 static int wtpoll (wtinfo_t *t, int mask, int bits);
  186 
  187 static  d_open_t        wtopen;
  188 static  d_read_t        wtread;
  189 static  d_write_t       wtwrite;
  190 static  d_close_t       wtclose;
  191 static  d_ioctl_t       wtioctl;
  192 static  d_strategy_t    wtstrategy;
  193 
  194 #define CDEV_MAJOR 10
  195 #define BDEV_MAJOR 3
  196 
  197 
  198 static struct cdevsw wt_cdevsw = {
  199           wtopen,       wtclose,        wtread,         wtwrite,
  200           wtioctl,      nostop,         nullreset,      nodevtotty,
  201           seltrue,      nommap,         wtstrategy,     "wt",
  202           NULL, -1 };
  203 
  204 
  205 /*
  206  * Probe for the presence of the device.
  207  */
  208 static int 
  209 wtprobe (struct isa_device *id)
  210 {
  211         wtinfo_t *t = wttab + id->id_unit;
  212 
  213         t->unit = id->id_unit;
  214         t->chan = id->id_drq;
  215         t->port = id->id_iobase;
  216         if (t->chan<1 || t->chan>3) {
  217                 printf ("wt%d: Bad drq=%d, should be 1..3\n", t->unit, t->chan);
  218                 return (0);
  219         }
  220 
  221         /* Try Wangtek. */
  222         t->type = WANGTEK;
  223         t->CTLPORT = WT_CTLPORT (t->port);  t->STATPORT = WT_STATPORT (t->port);
  224         t->CMDPORT = WT_CMDPORT (t->port);  t->DATAPORT = WT_DATAPORT (t->port);
  225         t->SDMAPORT = 0;                    t->RDMAPORT = 0;
  226         t->BUSY = WT_BUSY;                  t->NOEXCEP = WT_NOEXCEP;
  227         t->RESETMASK = WT_RESETMASK;        t->RESETVAL = WT_RESETVAL;
  228         t->ONLINE = WT_ONLINE;              t->RESET = WT_RESET;
  229         t->REQUEST = WT_REQUEST;            t->IEN = WT_IEN;
  230         if (wtreset (t))
  231                 return (WT_NPORT);
  232 
  233         /* Try Archive. */
  234         t->type = ARCHIVE;
  235         t->CTLPORT = AV_CTLPORT (t->port);  t->STATPORT = AV_STATPORT (t->port);
  236         t->CMDPORT = AV_CMDPORT (t->port);  t->DATAPORT = AV_DATAPORT (t->port);
  237         t->SDMAPORT = AV_SDMAPORT (t->port); t->RDMAPORT = AV_RDMAPORT (t->port);
  238         t->BUSY = AV_BUSY;                  t->NOEXCEP = AV_NOEXCEP;
  239         t->RESETMASK = AV_RESETMASK;        t->RESETVAL = AV_RESETVAL;
  240         t->ONLINE = 0;                      t->RESET = AV_RESET;
  241         t->REQUEST = AV_REQUEST;            t->IEN = AV_IEN;
  242         if (wtreset (t))
  243                 return (AV_NPORT);
  244 
  245         /* Tape controller not found. */
  246         t->type = UNKNOWN;
  247         return (0);
  248 }
  249 
  250 /*
  251  * Device is found, configure it.
  252  */
  253 static int
  254 wtattach (struct isa_device *id)
  255 {
  256         wtinfo_t *t = wttab + id->id_unit;
  257 
  258         id->id_ointr = wtintr;
  259         if (t->type == ARCHIVE) {
  260                 printf ("wt%d: type <Archive>\n", t->unit);
  261                 outb (t->RDMAPORT, 0);          /* reset dma */
  262         } else
  263                 printf ("wt%d: type <Wangtek>\n", t->unit);
  264         t->flags = TPSTART;                     /* tape is rewound */
  265         t->dens = -1;                           /* unknown density */
  266         isa_dmainit(t->chan, 1024);
  267 
  268 #ifdef DEVFS
  269         t->devfs_token_r = 
  270                 devfs_add_devswf(&wt_cdevsw, id->id_unit, DV_CHR, 0, 0, 
  271                                  0600, "rwt%d", id->id_unit);
  272 #endif
  273         return (1);
  274 }
  275 
  276 struct isa_driver wtdriver = { wtprobe, wtattach, "wt", };
  277 
  278 /*
  279  * Open routine, called on every device open.
  280  */
  281 static int
  282 wtopen (dev_t dev, int flag, int fmt, struct proc *p)
  283 {
  284         int u = minor (dev) & T_UNIT;
  285         wtinfo_t *t = wttab + u;
  286         int error;
  287 
  288         if (u >= NWT || t->type == UNKNOWN)
  289                 return (ENXIO);
  290 
  291         /* Check that device is not in use */
  292         if (t->flags & TPINUSE)
  293                 return (EBUSY);
  294 
  295         /* If the tape is in rewound state, check the status and set density. */
  296         if (t->flags & TPSTART) {
  297                 /* If rewind is going on, wait */
  298                 if (error = wtwait (t, PCATCH, "wtrew"))
  299                         return (error);
  300 
  301                 /* Check the controller status */
  302                 if (! wtsense (t, 0, (flag & FWRITE) ? 0 : TP_WRP)) {
  303                         /* Bad status, reset the controller */
  304                         if (! wtreset (t))
  305                                 return (EIO);
  306                         if (! wtsense (t, 1, (flag & FWRITE) ? 0 : TP_WRP))
  307                                 return (EIO);
  308                 }
  309 
  310                 /* Set up tape density. */
  311                 if (t->dens != (minor (dev) & WT_DENSEL)) {
  312                         int d = 0;
  313 
  314                         switch (minor (dev) & WT_DENSEL) {
  315                         case WT_DENSDFLT: default: break; /* default density */
  316                         case WT_QIC11:  d = QIC_FMT11;  break; /* minor 010 */
  317                         case WT_QIC24:  d = QIC_FMT24;  break; /* minor 020 */
  318                         case WT_QIC120: d = QIC_FMT120; break; /* minor 030 */
  319                         case WT_QIC150: d = QIC_FMT150; break; /* minor 040 */
  320                         case WT_QIC300: d = QIC_FMT300; break; /* minor 050 */
  321                         case WT_QIC600: d = QIC_FMT600; break; /* minor 060 */
  322                         }
  323                         if (d) {
  324                                 /* Change tape density. */
  325                                 if (! wtcmd (t, d))
  326                                         return (EIO);
  327                                 if (! wtsense (t, 1, TP_WRP | TP_ILL))
  328                                         return (EIO);
  329 
  330                                 /* Check the status of the controller. */
  331                                 if (t->error.err & TP_ILL) {
  332                                         printf ("wt%d: invalid tape density\n", t->unit);
  333                                         return (ENODEV);
  334                                 }
  335                         }
  336                         t->dens = minor (dev) & WT_DENSEL;
  337                 }
  338                 t->flags &= ~TPSTART;
  339         } else if (t->dens != (minor (dev) & WT_DENSEL))
  340                 return (ENXIO);
  341 
  342         t->bsize = (minor (dev) & WT_BSIZE) ? 1024 : 512;
  343         t->buf = malloc (t->bsize, M_TEMP, M_WAITOK);
  344         if (! t->buf)
  345                 return (EAGAIN);
  346 
  347         if (isa_dma_acquire(t->chan))
  348                 return(EBUSY);
  349 
  350         t->flags = TPINUSE;
  351 
  352         if (flag & FREAD)
  353                 t->flags |= TPREAD;
  354         if (flag & FWRITE)
  355                 t->flags |= TPWRITE;
  356         return (0);
  357 }
  358 
  359 /*
  360  * Close routine, called on last device close.
  361  */
  362 static int
  363 wtclose (dev_t dev, int flags, int fmt, struct proc *p)
  364 {
  365         int u = minor (dev) & T_UNIT;
  366         wtinfo_t *t = wttab + u;
  367 
  368         if (u >= NWT || t->type == UNKNOWN)
  369                 return (ENXIO);
  370 
  371         /* If rewind is pending, do nothing */
  372         if (t->flags & TPREW)
  373                 goto done;
  374 
  375         /* If seek forward is pending and no rewind on close, do nothing */
  376         if (t->flags & TPRMARK) {
  377                 if (minor (dev) & T_NOREWIND)
  378                         goto done;
  379 
  380                 /* If read file mark is going on, wait */
  381                 wtwait (t, 0, "wtrfm");
  382         }
  383 
  384         if (t->flags & TPWANY)
  385                 /* Tape was written.  Write file mark. */
  386                 wtwritefm (t);
  387 
  388         if (! (minor (dev) & T_NOREWIND)) {
  389                 /* Rewind tape to beginning of tape. */
  390                 /* Don't wait until rewind, though. */
  391                 wtrewind (t);
  392                 goto done;
  393         }
  394         if ((t->flags & TPRANY) && ! (t->flags & (TPVOL | TPWANY)))
  395                 /* Space forward to after next file mark if no writing done. */
  396                 /* Don't wait for completion. */
  397                 wtreadfm (t);
  398 done:
  399         t->flags &= TPREW | TPRMARK | TPSTART | TPTIMER;
  400         free (t->buf, M_TEMP);
  401         isa_dma_release(t->chan);
  402         return (0);
  403 }
  404 
  405 /*
  406  * Ioctl routine.  Compatible with BSD ioctls.
  407  * There are two possible ioctls:
  408  * ioctl (int fd, MTIOCGET, struct mtget *buf)  -- get status
  409  * ioctl (int fd, MTIOCTOP, struct mtop *buf)   -- do BSD-like op
  410  */
  411 static int
  412 wtioctl (dev_t dev, u_long cmd, caddr_t arg, int flags, struct proc *p)
  413 {
  414         int u = minor (dev) & T_UNIT;
  415         wtinfo_t *t = wttab + u;
  416         int error, count, op;
  417 
  418         if (u >= NWT || t->type == UNKNOWN)
  419                 return (ENXIO);
  420 
  421         switch (cmd) {
  422         default:
  423                 return (EINVAL);
  424         case MTIOCIEOT:         /* ignore EOT errors */
  425         case MTIOCEEOT:         /* enable EOT errors */
  426                 return (0);
  427         case MTIOCGET:
  428                 ((struct mtget*)arg)->mt_type =
  429                         t->type == ARCHIVE ? MT_ISVIPER1 : 0x11;
  430                 ((struct mtget*)arg)->mt_dsreg = t->flags;      /* status */
  431                 ((struct mtget*)arg)->mt_erreg = t->error.err;  /* errors */
  432                 ((struct mtget*)arg)->mt_resid = 0;
  433                 ((struct mtget*)arg)->mt_fileno = 0;            /* file */
  434                 ((struct mtget*)arg)->mt_blkno = 0;             /* block */
  435                 return (0);
  436         case MTIOCTOP:
  437                 break;
  438         }
  439         switch ((short) ((struct mtop*)arg)->mt_op) {
  440         default:
  441         case MTFSR:             /* forward space record */
  442         case MTBSR:             /* backward space record */
  443         case MTBSF:             /* backward space file */
  444                 break;
  445         case MTNOP:             /* no operation, sets status only */
  446         case MTCACHE:           /* enable controller cache */
  447         case MTNOCACHE:         /* disable controller cache */
  448                 return (0);
  449         case MTREW:             /* rewind */
  450         case MTOFFL:            /* rewind and put the drive offline */
  451                 if (t->flags & TPREW)   /* rewind is running */
  452                         return (0);
  453                 if (error = wtwait (t, PCATCH, "wtorew"))
  454                         return (error);
  455                 wtrewind (t);
  456                 return (0);
  457         case MTFSF:             /* forward space file */
  458                 for (count=((struct mtop*)arg)->mt_count; count>0; --count) {
  459                         if (error = wtwait (t, PCATCH, "wtorfm"))
  460                                 return (error);
  461                         if (error = wtreadfm (t))
  462                                 return (error);
  463                 }
  464                 return (0);
  465         case MTWEOF:            /* write an end-of-file record */
  466                 if (! (t->flags & TPWRITE) || (t->flags & TPWP))
  467                         return (EACCES);
  468                 if (error = wtwait (t, PCATCH, "wtowfm"))
  469                         return (error);
  470                 if (error = wtwritefm (t))
  471                         return (error);
  472                 return (0);
  473         case MTRETENS:          /* re-tension tape */
  474                 if (error = wtwait (t, PCATCH, "wtretens"))
  475                         return (error);
  476                 op = QIC_RETENS;
  477                 goto erase_retens;
  478                 
  479         case MTERASE:           /* erase to EOM */
  480                 if (! (t->flags & TPWRITE) || (t->flags & TPWP))
  481                         return (EACCES);
  482                 if (error = wtwait (t, PCATCH, "wterase"))
  483                         return (error);
  484                 op = QIC_ERASE;
  485         erase_retens:
  486                 /* ERASE and RETENS operations work like REWIND. */
  487                 /* Simulate the rewind operation here. */
  488                 t->flags &= ~(TPRO | TPWO | TPVOL);
  489                 if (! wtcmd (t, op))
  490                         return (EIO);
  491                 t->flags |= TPSTART | TPREW;
  492                 t->flags |= TPWANY;
  493                 wtclock (t);
  494                 return (0);
  495         }
  496         return (EINVAL);
  497 }
  498 
  499 static int
  500 wtread(dev_t dev, struct uio *uio, int ioflag)
  501 {
  502         return (physio(wtstrategy, NULL, dev, 1, minphys, uio));
  503 }
  504 
  505 static int
  506 wtwrite(dev_t dev, struct uio *uio, int ioflag)
  507 {
  508         return (physio(wtstrategy, NULL, dev, 0, minphys, uio));
  509 }
  510 
  511 /*
  512  * Strategy routine.
  513  */
  514 static void
  515 wtstrategy (struct buf *bp)
  516 {
  517         int u = minor (bp->b_dev) & T_UNIT;
  518         wtinfo_t *t = wttab + u;
  519         int s;
  520 
  521         bp->b_resid = bp->b_bcount;
  522         if (u >= NWT || t->type == UNKNOWN) {
  523                 bp->b_error = ENXIO;
  524                 goto err2xit;
  525         }
  526 
  527         /* at file marks and end of tape, we just return '0 bytes available' */
  528         if (t->flags & TPVOL)
  529                 goto xit;
  530 
  531         if (bp->b_bcount % t->bsize != 0) {
  532                 bp->b_error = EINVAL;
  533                 goto err2xit;
  534         }
  535 
  536         if (bp->b_flags & B_READ) {
  537                 /* Check read access and no previous write to this tape. */
  538                 if (! (t->flags & TPREAD) || (t->flags & TPWANY))
  539                         goto errxit;
  540 
  541                 /* For now, we assume that all data will be copied out */
  542                 /* If read command outstanding, just skip down */
  543                 if (! (t->flags & TPRO)) {
  544                         if (! wtsense (t, 1, TP_WRP))   /* clear status */
  545                                 goto errxit;
  546                         if (! wtcmd (t, QIC_RDDATA)) {  /* sed read mode */
  547                                 wtsense (t, 1, TP_WRP);
  548                                 goto errxit;
  549                         }
  550                         t->flags |= TPRO | TPRANY;
  551                 }
  552         } else {
  553                 /* Check write access and write protection. */
  554                 /* No previous read from this tape allowed. */
  555                 if (! (t->flags & TPWRITE) || (t->flags & (TPWP | TPRANY)))
  556                         goto errxit;
  557 
  558                 /* If write command outstanding, just skip down */
  559                 if (! (t->flags & TPWO)) {
  560                         if (! wtsense (t, 1, 0))        /* clear status */
  561                                 goto errxit;
  562                         if (! wtcmd (t, QIC_WRTDATA)) { /* set write mode */
  563                                 wtsense (t, 1, 0);
  564                                 goto errxit;
  565                         }
  566                         t->flags |= TPWO | TPWANY;
  567                 }
  568         }
  569 
  570         if (! bp->b_bcount)
  571                 goto xit;
  572 
  573         t->flags &= ~TPEXCEP;
  574         s = splbio ();
  575         if (wtstart (t, bp->b_flags, bp->b_data, bp->b_bcount)) {
  576                 wtwait (t, 0, (bp->b_flags & B_READ) ? "wtread" : "wtwrite");
  577                 bp->b_resid -= t->dmacount;
  578         }
  579         splx (s);
  580 
  581         if (t->flags & TPEXCEP) {
  582 errxit:         bp->b_error = EIO;
  583 err2xit:        bp->b_flags |= B_ERROR;
  584         }
  585 xit:    biodone (bp);
  586         return;
  587 }
  588 
  589 /*
  590  * Interrupt routine.
  591  */
  592 static void
  593 wtintr (int u)
  594 {
  595         wtinfo_t *t = wttab + u;
  596         unsigned char s;
  597 
  598         if (u >= NWT || t->type == UNKNOWN) {
  599                 TRACE (("wtintr() -- device not configured\n"));
  600                 return;
  601         }
  602 
  603         s = inb (t->STATPORT);                  /* get status */
  604         TRACE (("wtintr() status=0x%x -- ", s));
  605         if ((s & (t->BUSY | t->NOEXCEP)) == (t->BUSY | t->NOEXCEP)) {
  606                 TRACE (("busy\n"));
  607                 return;                         /* device is busy */
  608         }
  609 
  610         /*
  611          * Check if rewind finished.
  612          */
  613         if (t->flags & TPREW) {
  614                 TRACE (((s & (t->BUSY | t->NOEXCEP)) == (t->BUSY | t->NOEXCEP) ?
  615                         "rewind busy?\n" : "rewind finished\n"));
  616                 t->flags &= ~TPREW;             /* Rewind finished. */
  617                 wtsense (t, 1, TP_WRP);
  618                 wakeup ((caddr_t)t);
  619                 return;
  620         }
  621 
  622         /*
  623          * Check if writing/reading of file mark finished.
  624          */
  625         if (t->flags & (TPRMARK | TPWMARK)) {
  626                 TRACE (((s & (t->BUSY | t->NOEXCEP)) == (t->BUSY | t->NOEXCEP) ?
  627                         "marker r/w busy?\n" : "marker r/w finished\n"));
  628                 if (! (s & t->NOEXCEP))         /* operation failed */
  629                         wtsense (t, 1, (t->flags & TPRMARK) ? TP_WRP : 0);
  630                 t->flags &= ~(TPRMARK | TPWMARK); /* operation finished */
  631                 wakeup ((caddr_t)t);
  632                 return;
  633         }
  634 
  635         /*
  636          * Do we started any i/o?  If no, just return.
  637          */
  638         if (! (t->flags & TPACTIVE)) {
  639                 TRACE (("unexpected interrupt\n"));
  640                 return;
  641         }
  642 
  643         /*
  644          * Clean up dma.
  645          */
  646         if ((t->dmaflags & B_READ) && (t->dmatotal - t->dmacount) < t->bsize) {
  647                 /* If reading short block, copy the internal buffer
  648                  * to the user memory. */
  649                 isa_dmadone (t->dmaflags, t->buf, t->bsize, t->chan);
  650                 bcopy (t->buf, t->dmavaddr, t->dmatotal - t->dmacount);
  651         } else
  652                 isa_dmadone (t->dmaflags, t->dmavaddr, t->bsize, t->chan);
  653 
  654         t->flags &= ~TPACTIVE;
  655         t->dmacount += t->bsize;
  656         t->dmavaddr = (char *)t->dmavaddr + t->bsize;
  657 
  658         /*
  659          * On exception, check for end of file and end of volume.
  660          */
  661         if (! (s & t->NOEXCEP)) {
  662                 TRACE (("i/o exception\n"));
  663                 wtsense (t, 1, (t->dmaflags & B_READ) ? TP_WRP : 0);
  664                 if (t->error.err & (TP_EOM | TP_FIL))
  665                         t->flags |= TPVOL;      /* end of file */
  666                 else
  667                         t->flags |= TPEXCEP;    /* i/o error */
  668                 wakeup ((caddr_t)t);
  669                 return;
  670         }
  671 
  672         if (t->dmacount < t->dmatotal) {        /* continue i/o */
  673                 wtdma (t);
  674                 TRACE (("continue i/o, %d\n", t->dmacount));
  675                 return;
  676         }
  677         if (t->dmacount > t->dmatotal)          /* short last block */
  678                 t->dmacount = t->dmatotal;
  679         wakeup ((caddr_t)t);    /* wake up user level */
  680         TRACE (("i/o finished, %d\n", t->dmacount));
  681 }
  682 
  683 /* start the rewind operation */
  684 static void
  685 wtrewind (wtinfo_t *t)
  686 {
  687         int rwmode = (t->flags & (TPRO | TPWO));
  688 
  689         t->flags &= ~(TPRO | TPWO | TPVOL);
  690         /*
  691          * Wangtek strictly follows QIC-02 standard:
  692          * clearing ONLINE in read/write modes causes rewind.
  693          * REWIND command is not allowed in read/write mode
  694          * and gives `illegal command' error.
  695          */
  696         if (t->type==WANGTEK && rwmode) {
  697                 outb (t->CTLPORT, 0);
  698         } else if (! wtcmd (t, QIC_REWIND))
  699                 return;
  700         t->flags |= TPSTART | TPREW;
  701         wtclock (t);
  702 }
  703 
  704 /* start the `read marker' operation */
  705 static int
  706 wtreadfm (wtinfo_t *t)
  707 {
  708         t->flags &= ~(TPRO | TPWO | TPVOL);
  709         if (! wtcmd (t, QIC_READFM)) {
  710                 wtsense (t, 1, TP_WRP);
  711                 return (EIO);
  712         }
  713         t->flags |= TPRMARK | TPRANY;
  714         wtclock (t);
  715         /* Don't wait for completion here. */
  716         return (0);
  717 }
  718 
  719 /* write marker to the tape */
  720 static int
  721 wtwritefm (wtinfo_t *t)
  722 {
  723         tsleep ((caddr_t)wtwritefm, WTPRI, "wtwfm", hz); /* timeout: 1 second */
  724         t->flags &= ~(TPRO | TPWO);
  725         if (! wtcmd (t, QIC_WRITEFM)) {
  726                 wtsense (t, 1, 0);
  727                 return (EIO);
  728         }
  729         t->flags |= TPWMARK | TPWANY;
  730         wtclock (t);
  731         return (wtwait (t, 0, "wtwfm"));
  732 }
  733 
  734 /* while controller status & mask == bits continue waiting */
  735 static int
  736 wtpoll (wtinfo_t *t, int mask, int bits)
  737 {
  738         int s, i;
  739 
  740         /* Poll status port, waiting for specified bits. */
  741         for (i=0; i<1000; ++i) {                        /* up to 1 msec */
  742                 s = inb (t->STATPORT);
  743                 if ((s & mask) != bits)
  744                         return (s);
  745                 DELAY (1);
  746         }
  747         for (i=0; i<100; ++i) {                         /* up to 10 msec */
  748                 s = inb (t->STATPORT);
  749                 if ((s & mask) != bits)
  750                         return (s);
  751                 DELAY (100);
  752         }
  753         for (;;) {                                      /* forever */
  754                 s = inb (t->STATPORT);
  755                 if ((s & mask) != bits)
  756                         return (s);
  757                 tsleep ((caddr_t)wtpoll, WTPRI, "wtpoll", 1); /* timeout: 1 tick */
  758         }
  759 }
  760 
  761 /* execute QIC command */
  762 static int
  763 wtcmd (wtinfo_t *t, int cmd)
  764 {
  765         int s, x;
  766 
  767         TRACE (("wtcmd() cmd=0x%x\n", cmd));
  768         x = splbio();
  769         s = wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP); /* ready? */
  770         if (! (s & t->NOEXCEP)) {                       /* error */
  771                 splx(x);
  772                 return (0);
  773         }
  774 
  775         outb (t->CMDPORT, cmd);                         /* output the command */
  776 
  777         outb (t->CTLPORT, t->REQUEST | t->ONLINE);      /* set request */
  778         wtpoll (t, t->BUSY, t->BUSY);                   /* wait for ready */
  779         outb (t->CTLPORT, t->IEN | t->ONLINE);          /* reset request */
  780         wtpoll (t, t->BUSY, 0);                         /* wait for not ready */
  781         splx(x);
  782         return (1);
  783 }
  784 
  785 /* wait for the end of i/o, seeking marker or rewind operation */
  786 static int
  787 wtwait (wtinfo_t *t, int catch, char *msg)
  788 {
  789         int error;
  790 
  791         TRACE (("wtwait() `%s'\n", msg));
  792         while (t->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK))
  793                 if (error = tsleep ((caddr_t)t, WTPRI | catch, msg, 0))
  794                         return (error);
  795         return (0);
  796 }
  797 
  798 /* initialize dma for the i/o operation */
  799 static void
  800 wtdma (wtinfo_t *t)
  801 {
  802         t->flags |= TPACTIVE;
  803         wtclock (t);
  804 
  805         if (t->type == ARCHIVE)
  806                 outb (t->SDMAPORT, 0);          /* set dma */
  807 
  808         if ((t->dmaflags & B_READ) && (t->dmatotal - t->dmacount) < t->bsize)
  809                 /* Reading short block.  Do it through the internal buffer. */
  810                 isa_dmastart (t->dmaflags, t->buf, t->bsize, t->chan);
  811         else
  812                 isa_dmastart (t->dmaflags, t->dmavaddr, t->bsize, t->chan);
  813 }
  814 
  815 /* start i/o operation */
  816 static int
  817 wtstart (wtinfo_t *t, unsigned flags, void *vaddr, unsigned len)
  818 {
  819         int s, x;
  820 
  821         TRACE (("wtstart()\n"));
  822         x = splbio();
  823         s = wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP); /* ready? */
  824         if (! (s & t->NOEXCEP)) {
  825                 t->flags |= TPEXCEP;            /* error */
  826                 splx(x);
  827                 return (0);
  828         }
  829         t->flags &= ~TPEXCEP;                   /* clear exception flag */
  830         t->dmavaddr = vaddr;
  831         t->dmatotal = len;
  832         t->dmacount = 0;
  833         t->dmaflags = flags;
  834         wtdma (t);
  835         splx(x);
  836         return (1);
  837 }
  838 
  839 /* start timer */
  840 static void
  841 wtclock (wtinfo_t *t)
  842 {
  843         if (! (t->flags & TPTIMER)) {
  844                 t->flags |= TPTIMER;
  845                 /* Some controllers seem to lose dma interrupts too often.
  846                  * To make the tape stream we need 1 tick timeout. */
  847                 timeout (wtimer, (caddr_t)t, (t->flags & TPACTIVE) ? 1 : hz);
  848         }
  849 }
  850 
  851 /*
  852  * Simulate an interrupt periodically while i/o is going.
  853  * This is necessary in case interrupts get eaten due to
  854  * multiple devices on a single IRQ line.
  855  */
  856 static void
  857 wtimer (void *xt)
  858 {
  859         wtinfo_t *t = (wtinfo_t *)xt;
  860         int s;
  861 
  862         t->flags &= ~TPTIMER;
  863         if (! (t->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK)))
  864                 return;
  865 
  866         /* If i/o going, simulate interrupt. */
  867         s = splbio ();
  868         if ((inb (t->STATPORT) & (t->BUSY | t->NOEXCEP)) != (t->BUSY | t->NOEXCEP)) {
  869                 TRACE (("wtimer() -- "));
  870                 wtintr (t->unit);
  871         }
  872         splx (s);
  873 
  874         /* Restart timer if i/o pending. */
  875         if (t->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK))
  876                 wtclock (t);
  877 }
  878 
  879 /* reset the controller */
  880 static int
  881 wtreset (wtinfo_t *t)
  882 {
  883         /* Perform QIC-02 and QIC-36 compatible reset sequence. */
  884         /* Thanks to Mikael Hybsch <micke@dynas.se>. */
  885         int s, i;
  886 
  887         outb (t->CTLPORT, t->RESET | t->ONLINE); /* send reset */
  888         DELAY (30);
  889         outb (t->CTLPORT, t->ONLINE);           /* turn off reset */
  890         DELAY (30);
  891 
  892         /* Read the controller status. */
  893         s = inb (t->STATPORT);
  894         if (s == 0xff)                          /* no port at this address? */
  895                 return (0);
  896 
  897         /* Wait 3 sec for reset to complete. Needed for QIC-36 boards? */
  898         for (i=0; i<3000; ++i) {
  899                 if (! (s & t->BUSY) || ! (s & t->NOEXCEP))
  900                         break;
  901                 DELAY (1000);
  902                 s = inb (t->STATPORT);
  903         }
  904         return ((s & t->RESETMASK) == t->RESETVAL);
  905 }
  906 
  907 /* get controller status information */
  908 /* return 0 if user i/o request should receive an i/o error code */
  909 static int
  910 wtsense (wtinfo_t *t, int verb, int ignor)
  911 {
  912         char *msg = 0;
  913         int err;
  914 
  915         TRACE (("wtsense() ignor=0x%x\n", ignor));
  916         t->flags &= ~(TPRO | TPWO);
  917         if (! wtstatus (t))
  918                 return (0);
  919         if (! (t->error.err & TP_ST0))
  920                 t->error.err &= ~TP_ST0MASK;
  921         if (! (t->error.err & TP_ST1))
  922                 t->error.err &= ~TP_ST1MASK;
  923         t->error.err &= ~ignor;         /* ignore certain errors */
  924         err = t->error.err & (TP_FIL | TP_BNL | TP_UDA | TP_EOM | TP_WRP |
  925                 TP_USL | TP_CNI | TP_MBD | TP_NDT | TP_ILL);
  926         if (! err)
  927                 return (1);
  928         if (! verb)
  929                 return (0);
  930 
  931         /* lifted from tdriver.c from Wangtek */
  932         if      (err & TP_USL)  msg = "Drive not online";
  933         else if (err & TP_CNI)  msg = "No cartridge";
  934         else if ((err & TP_WRP) && !(t->flags & TPWP)) {
  935                 msg = "Tape is write protected";
  936                 t->flags |= TPWP;
  937         }
  938         else if (err & TP_FIL)  msg = 0 /*"Filemark detected"*/;
  939         else if (err & TP_EOM)  msg = 0 /*"End of tape"*/;
  940         else if (err & TP_BNL)  msg = "Block not located";
  941         else if (err & TP_UDA)  msg = "Unrecoverable data error";
  942         else if (err & TP_NDT)  msg = "No data detected";
  943         else if (err & TP_ILL)  msg = "Illegal command";
  944         if (msg)
  945                 printf ("wt%d: %s\n", t->unit, msg);
  946         return (0);
  947 }
  948 
  949 /* get controller status information */
  950 static int
  951 wtstatus (wtinfo_t *t)
  952 {
  953         char *p;
  954         int x;
  955 
  956         x = splbio();
  957         wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP); /* ready? */
  958         outb (t->CMDPORT, QIC_RDSTAT);  /* send `read status' command */
  959 
  960         outb (t->CTLPORT, t->REQUEST | t->ONLINE);      /* set request */
  961         wtpoll (t, t->BUSY, t->BUSY);                   /* wait for ready */
  962         outb (t->CTLPORT, t->ONLINE);                   /* reset request */
  963         wtpoll (t, t->BUSY, 0);                         /* wait for not ready */
  964 
  965         p = (char*) &t->error;
  966         while (p < (char*)&t->error + 6) {
  967                 int s = wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP);
  968                 if (! (s & t->NOEXCEP)) {               /* error */
  969                         splx(x);
  970                         return (0);
  971                 }
  972 
  973                 *p++ = inb (t->DATAPORT);               /* read status byte */
  974 
  975                 outb (t->CTLPORT, t->REQUEST | t->ONLINE); /* set request */
  976                 wtpoll (t, t->BUSY, 0);                 /* wait for not ready */
  977                 DELAY(20);
  978                 outb (t->CTLPORT, t->ONLINE);           /* unset request */
  979         }
  980         splx(x);
  981         return (1);
  982 }
  983 
  984 
  985 static wt_devsw_installed = 0;
  986 
  987 static void 
  988 wt_drvinit(void *unused)
  989 {
  990 
  991         if( ! wt_devsw_installed ) {
  992                 dev_t dev;
  993 
  994                 dev = makedev(CDEV_MAJOR, 0);
  995                 cdevsw_add(&dev, &wt_cdevsw, NULL);
  996                 wt_devsw_installed = 1;
  997         }
  998 }
  999 
 1000 SYSINIT(wtdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,wt_drvinit,NULL)
 1001 
 1002 
 1003 #endif /* NWT */

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