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: releng/5.0/sys/i386/isa/wt.c 96561 2002-05-14 06:57:02Z phk $
   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 
   62 #include <sys/param.h>
   63 #include <sys/systm.h>
   64 #include <sys/kernel.h>
   65 #include <sys/bio.h>
   66 #include <sys/fcntl.h>
   67 #include <sys/malloc.h>
   68 #include <sys/mtio.h>
   69 #include <sys/conf.h>
   70 #include <sys/bus.h>
   71 
   72 
   73 #include <i386/isa/isa_device.h>
   74 #include <i386/isa/wtreg.h>
   75 
   76 #ifndef COMPAT_OLDISA
   77 #error "The wt device requires the old isa compatibility shims"
   78 #endif
   79 
   80 /*
   81  * Uncomment this to enable internal device tracing.
   82  */
   83 #define TRACE(s)                /* printf s */
   84 
   85 #define WTPRI                   (PZERO+10)      /* sleep priority */
   86 
   87 /*
   88  * Wangtek controller ports
   89  */
   90 #define WT_CTLPORT(base)        ((base)+0)      /* control, write only */
   91 #define WT_STATPORT(base)       ((base)+0)      /* status, read only */
   92 #define WT_CMDPORT(base)        ((base)+1)      /* command, write only */
   93 #define WT_DATAPORT(base)       ((base)+1)      /* data, read only */
   94 #define WT_NPORT                2               /* 2 i/o ports */
   95 
   96 /* status port bits */
   97 #define WT_BUSY                 0x01            /* not ready bit define */
   98 #define WT_NOEXCEP              0x02            /* no exception bit define */
   99 #define WT_RESETMASK            0x07            /* to check after reset */
  100 #define WT_RESETVAL             0x05            /* state after reset */
  101 
  102 /* control port bits */
  103 #define WT_ONLINE               0x01            /* device selected */
  104 #define WT_RESET                0x02            /* reset command */
  105 #define WT_REQUEST              0x04            /* request command */
  106 #define WT_IEN                  0x08            /* enable dma */
  107 
  108 /*
  109  * Archive controller ports
  110  */
  111 #define AV_DATAPORT(base)       ((base)+0)      /* data, read only */
  112 #define AV_CMDPORT(base)        ((base)+0)      /* command, write only */
  113 #define AV_STATPORT(base)       ((base)+1)      /* status, read only */
  114 #define AV_CTLPORT(base)        ((base)+1)      /* control, write only */
  115 #define AV_SDMAPORT(base)       ((base)+2)      /* start dma */
  116 #define AV_RDMAPORT(base)       ((base)+3)      /* reset dma */
  117 #define AV_NPORT                4               /* 4 i/o ports */
  118 
  119 /* status port bits */
  120 #define AV_BUSY                 0x40            /* not ready bit define */
  121 #define AV_NOEXCEP              0x20            /* no exception bit define */
  122 #define AV_RESETMASK            0xf8            /* to check after reset */
  123 #define AV_RESETVAL             0x50            /* state after reset */
  124 
  125 /* control port bits */
  126 #define AV_RESET                0x80            /* reset command */
  127 #define AV_REQUEST              0x40            /* request command */
  128 #define AV_IEN                  0x20            /* enable interrupts */
  129 
  130 enum wttype {
  131         UNKNOWN = 0,                    /* unknown type, driver disabled */
  132         ARCHIVE,                        /* Archive Viper SC499, SC402 etc */
  133         WANGTEK                         /* Wangtek */
  134 };
  135 
  136 typedef struct {
  137         unsigned short err;             /* code for error encountered */
  138         unsigned short ercnt;           /* number of error blocks */
  139         unsigned short urcnt;           /* number of underruns */
  140 } wtstatus_t;
  141 
  142 typedef struct {
  143         enum wttype type;               /* type of controller */
  144         unsigned unit;                  /* unit number */
  145         unsigned port;                  /* base i/o port */
  146         unsigned chan;                  /* dma channel number, 1..3 */
  147         unsigned flags;                 /* state of tape drive */
  148         unsigned dens;                  /* tape density */
  149         int bsize;                      /* tape block size */
  150         void *buf;                      /* internal i/o buffer */
  151 
  152         void *dmavaddr;                 /* virtual address of dma i/o buffer */
  153         unsigned dmatotal;              /* size of i/o buffer */
  154         unsigned dmaflags;              /* i/o direction, ISADMA_READ or ISADMA_WRITE */
  155         unsigned dmacount;              /* resulting length of dma i/o */
  156 
  157         wtstatus_t error;               /* status of controller */
  158 
  159         unsigned short DATAPORT, CMDPORT, STATPORT, CTLPORT, SDMAPORT, RDMAPORT;
  160         unsigned char BUSY, NOEXCEP, RESETMASK, RESETVAL;
  161         unsigned char ONLINE, RESET, REQUEST, IEN;
  162 } wtinfo_t;
  163 
  164 static wtinfo_t wttab[NWT];                    /* tape info by unit number */
  165 
  166 static int wtwait (wtinfo_t *t, int catch, char *msg);
  167 static int wtcmd (wtinfo_t *t, int cmd);
  168 static int wtstart (wtinfo_t *t, unsigned mode, void *vaddr, unsigned len);
  169 static void wtdma (wtinfo_t *t);
  170 static timeout_t wtimer;
  171 static void wtclock (wtinfo_t *t);
  172 static int wtreset (wtinfo_t *t);
  173 static int wtsense (wtinfo_t *t, int verb, int ignor);
  174 static int wtstatus (wtinfo_t *t);
  175 static ointhand2_t wtintr;
  176 static void wtrewind (wtinfo_t *t);
  177 static int wtreadfm (wtinfo_t *t);
  178 static int wtwritefm (wtinfo_t *t);
  179 static int wtpoll (wtinfo_t *t, int mask, int bits);
  180 
  181 static  d_open_t        wtopen;
  182 static  d_close_t       wtclose;
  183 static  d_ioctl_t       wtioctl;
  184 static  d_strategy_t    wtstrategy;
  185 
  186 #define CDEV_MAJOR 10
  187 
  188 static struct cdevsw wt_cdevsw = {
  189         /* open */      wtopen,
  190         /* close */     wtclose,
  191         /* read */      physread,
  192         /* write */     physwrite,
  193         /* ioctl */     wtioctl,
  194         /* poll */      nopoll,
  195         /* mmap */      nommap,
  196         /* strategy */  wtstrategy,
  197         /* name */      "wt",
  198         /* maj */       CDEV_MAJOR,
  199         /* dump */      nodump,
  200         /* psize */     nopsize,
  201         /* flags */     0,
  202 };
  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         make_dev(&wt_cdevsw, id->id_unit, 0, 0, 0600, "rwt%d", id->id_unit);
  269         return (1);
  270 }
  271 
  272 struct isa_driver wtdriver = {
  273         INTR_TYPE_BIO,
  274         wtprobe,
  275         wtattach,
  276         "wt",
  277 };
  278 COMPAT_ISA_DRIVER(wt, wtdriver);
  279 
  280 /*
  281  * Open routine, called on every device open.
  282  */
  283 static int
  284 wtopen (dev_t dev, int flag, int fmt, struct thread *td)
  285 {
  286         int u = minor (dev) & WT_UNIT;
  287         wtinfo_t *t = wttab + u;
  288         int error;
  289 
  290         if (u >= NWT || t->type == UNKNOWN)
  291                 return (ENXIO);
  292 
  293         /* Check that device is not in use */
  294         if (t->flags & TPINUSE)
  295                 return (EBUSY);
  296 
  297         /* If the tape is in rewound state, check the status and set density. */
  298         if (t->flags & TPSTART) {
  299                 /* If rewind is going on, wait */
  300                 error = wtwait (t, PCATCH, "wtrew");
  301                 if (error)
  302                         return (error);
  303 
  304                 /* Check the controller status */
  305                 if (! wtsense (t, 0, (flag & FWRITE) ? 0 : TP_WRP)) {
  306                         /* Bad status, reset the controller */
  307                         if (! wtreset (t))
  308                                 return (EIO);
  309                         if (! wtsense (t, 1, (flag & FWRITE) ? 0 : TP_WRP))
  310                                 return (EIO);
  311                 }
  312 
  313                 /* Set up tape density. */
  314                 if (t->dens != (minor (dev) & WT_DENSEL)) {
  315                         int d = 0;
  316 
  317                         switch (minor (dev) & WT_DENSEL) {
  318                         case WT_DENSDFLT: default: break; /* default density */
  319                         case WT_QIC11:  d = QIC_FMT11;  break; /* minor 010 */
  320                         case WT_QIC24:  d = QIC_FMT24;  break; /* minor 020 */
  321                         case WT_QIC120: d = QIC_FMT120; break; /* minor 030 */
  322                         case WT_QIC150: d = QIC_FMT150; break; /* minor 040 */
  323                         case WT_QIC300: d = QIC_FMT300; break; /* minor 050 */
  324                         case WT_QIC600: d = QIC_FMT600; break; /* minor 060 */
  325                         }
  326                         if (d) {
  327                                 /* Change tape density. */
  328                                 if (! wtcmd (t, d))
  329                                         return (EIO);
  330                                 if (! wtsense (t, 1, TP_WRP | TP_ILL))
  331                                         return (EIO);
  332 
  333                                 /* Check the status of the controller. */
  334                                 if (t->error.err & TP_ILL) {
  335                                         printf ("wt%d: invalid tape density\n", t->unit);
  336                                         return (ENODEV);
  337                                 }
  338                         }
  339                         t->dens = minor (dev) & WT_DENSEL;
  340                 }
  341                 t->flags &= ~TPSTART;
  342         } else if (t->dens != (minor (dev) & WT_DENSEL))
  343                 return (ENXIO);
  344 
  345         t->bsize = (minor (dev) & WT_BSIZE) ? 1024 : 512;
  346         t->buf = malloc (t->bsize, M_TEMP, M_WAITOK);
  347         if (! t->buf)
  348                 return (EAGAIN);
  349 
  350         if (isa_dma_acquire(t->chan))
  351                 return(EBUSY);
  352 
  353         t->flags = TPINUSE;
  354 
  355         if (flag & FREAD)
  356                 t->flags |= TPREAD;
  357         if (flag & FWRITE)
  358                 t->flags |= TPWRITE;
  359         return (0);
  360 }
  361 
  362 /*
  363  * Close routine, called on last device close.
  364  */
  365 static int
  366 wtclose (dev_t dev, int flags, int fmt, struct thread *td)
  367 {
  368         int u = minor (dev) & WT_UNIT;
  369         wtinfo_t *t = wttab + u;
  370 
  371         if (u >= NWT || t->type == UNKNOWN)
  372                 return (ENXIO);
  373 
  374         /* If rewind is pending, do nothing */
  375         if (t->flags & TPREW)
  376                 goto done;
  377 
  378         /* If seek forward is pending and no rewind on close, do nothing */
  379         if (t->flags & TPRMARK) {
  380                 if (minor (dev) & WT_NOREWIND)
  381                         goto done;
  382 
  383                 /* If read file mark is going on, wait */
  384                 wtwait (t, 0, "wtrfm");
  385         }
  386 
  387         if (t->flags & TPWANY)
  388                 /* Tape was written.  Write file mark. */
  389                 wtwritefm (t);
  390 
  391         if (! (minor (dev) & WT_NOREWIND)) {
  392                 /* Rewind tape to beginning of tape. */
  393                 /* Don't wait until rewind, though. */
  394                 wtrewind (t);
  395                 goto done;
  396         }
  397         if ((t->flags & TPRANY) && ! (t->flags & (TPVOL | TPWANY)))
  398                 /* Space forward to after next file mark if no writing done. */
  399                 /* Don't wait for completion. */
  400                 wtreadfm (t);
  401 done:
  402         t->flags &= TPREW | TPRMARK | TPSTART | TPTIMER;
  403         free (t->buf, M_TEMP);
  404         isa_dma_release(t->chan);
  405         return (0);
  406 }
  407 
  408 /*
  409  * Ioctl routine.  Compatible with BSD ioctls.
  410  * There are two possible ioctls:
  411  * ioctl (int fd, MTIOCGET, struct mtget *buf)  -- get status
  412  * ioctl (int fd, MTIOCTOP, struct mtop *buf)   -- do BSD-like op
  413  */
  414 static int
  415 wtioctl (dev_t dev, u_long cmd, caddr_t arg, int flags, struct thread *td)
  416 {
  417         int u = minor (dev) & WT_UNIT;
  418         wtinfo_t *t = wttab + u;
  419         int error, count, op;
  420 
  421         if (u >= NWT || t->type == UNKNOWN)
  422                 return (ENXIO);
  423 
  424         switch (cmd) {
  425         default:
  426                 return (EINVAL);
  427         case MTIOCIEOT:         /* ignore EOT errors */
  428         case MTIOCEEOT:         /* enable EOT errors */
  429                 return (0);
  430         case MTIOCGET:
  431                 ((struct mtget*)arg)->mt_type =
  432                         t->type == ARCHIVE ? MT_ISVIPER1 : 0x11;
  433                 ((struct mtget*)arg)->mt_dsreg = t->flags;      /* status */
  434                 ((struct mtget*)arg)->mt_erreg = t->error.err;  /* errors */
  435                 ((struct mtget*)arg)->mt_resid = 0;
  436                 ((struct mtget*)arg)->mt_fileno = 0;            /* file */
  437                 ((struct mtget*)arg)->mt_blkno = 0;             /* block */
  438                 return (0);
  439         case MTIOCTOP:
  440                 break;
  441         }
  442         switch ((short) ((struct mtop*)arg)->mt_op) {
  443         default:
  444         case MTFSR:             /* forward space record */
  445         case MTBSR:             /* backward space record */
  446         case MTBSF:             /* backward space file */
  447                 break;
  448         case MTNOP:             /* no operation, sets status only */
  449         case MTCACHE:           /* enable controller cache */
  450         case MTNOCACHE:         /* disable controller cache */
  451                 return (0);
  452         case MTREW:             /* rewind */
  453         case MTOFFL:            /* rewind and put the drive offline */
  454                 if (t->flags & TPREW)   /* rewind is running */
  455                         return (0);
  456                 error = wtwait (t, PCATCH, "wtorew");
  457                 if (error)
  458                         return (error);
  459                 wtrewind (t);
  460                 return (0);
  461         case MTFSF:             /* forward space file */
  462                 for (count=((struct mtop*)arg)->mt_count; count>0; --count) {
  463                         error = wtwait (t, PCATCH, "wtorfm");
  464                         if (error)
  465                                 return (error);
  466                         error = wtreadfm (t);
  467                         if (error)
  468                                 return (error);
  469                 }
  470                 return (0);
  471         case MTWEOF:            /* write an end-of-file record */
  472                 if (! (t->flags & TPWRITE) || (t->flags & TPWP))
  473                         return (EACCES);
  474                 error = wtwait (t, PCATCH, "wtowfm");
  475                 if (error)
  476                         return (error);
  477                 error = wtwritefm (t);
  478                 if (error)
  479                         return (error);
  480                 return (0);
  481         case MTRETENS:          /* re-tension tape */
  482                 error = wtwait (t, PCATCH, "wtretens");
  483                 if (error)
  484                         return (error);
  485                 op = QIC_RETENS;
  486                 goto erase_retens;
  487                 
  488         case MTERASE:           /* erase to EOM */
  489                 if (! (t->flags & TPWRITE) || (t->flags & TPWP))
  490                         return (EACCES);
  491                 error = wtwait (t, PCATCH, "wterase");
  492                 if (error)
  493                         return (error);
  494                 op = QIC_ERASE;
  495         erase_retens:
  496                 /* ERASE and RETENS operations work like REWIND. */
  497                 /* Simulate the rewind operation here. */
  498                 t->flags &= ~(TPRO | TPWO | TPVOL);
  499                 if (! wtcmd (t, op))
  500                         return (EIO);
  501                 t->flags |= TPSTART | TPREW;
  502                 t->flags |= TPWANY;
  503                 wtclock (t);
  504                 return (0);
  505         }
  506         return (EINVAL);
  507 }
  508 
  509 /*
  510  * Strategy routine.
  511  */
  512 static void
  513 wtstrategy (struct bio *bp)
  514 {
  515         int u = minor (bp->bio_dev) & WT_UNIT;
  516         wtinfo_t *t = wttab + u;
  517         int s;
  518 
  519         bp->bio_resid = bp->bio_bcount;
  520         if (u >= NWT || t->type == UNKNOWN) {
  521                 bp->bio_error = ENXIO;
  522                 goto err2xit;
  523         }
  524 
  525         /* at file marks and end of tape, we just return '0 bytes available' */
  526         if (t->flags & TPVOL)
  527                 goto xit;
  528 
  529         if (bp->bio_bcount % t->bsize != 0) {
  530                 bp->bio_error = EINVAL;
  531                 goto err2xit;
  532         }
  533 
  534         if (bp->bio_cmd == BIO_READ) {
  535                 /* Check read access and no previous write to this tape. */
  536                 if (! (t->flags & TPREAD) || (t->flags & TPWANY))
  537                         goto errxit;
  538 
  539                 /* For now, we assume that all data will be copied out */
  540                 /* If read command outstanding, just skip down */
  541                 if (! (t->flags & TPRO)) {
  542                         if (! wtsense (t, 1, TP_WRP))   /* clear status */
  543                                 goto errxit;
  544                         if (! wtcmd (t, QIC_RDDATA)) {  /* sed read mode */
  545                                 wtsense (t, 1, TP_WRP);
  546                                 goto errxit;
  547                         }
  548                         t->flags |= TPRO | TPRANY;
  549                 }
  550         } else {
  551                 /* Check write access and write protection. */
  552                 /* No previous read from this tape allowed. */
  553                 if (! (t->flags & TPWRITE) || (t->flags & (TPWP | TPRANY)))
  554                         goto errxit;
  555 
  556                 /* If write command outstanding, just skip down */
  557                 if (! (t->flags & TPWO)) {
  558                         if (! wtsense (t, 1, 0))        /* clear status */
  559                                 goto errxit;
  560                         if (! wtcmd (t, QIC_WRTDATA)) { /* set write mode */
  561                                 wtsense (t, 1, 0);
  562                                 goto errxit;
  563                         }
  564                         t->flags |= TPWO | TPWANY;
  565                 }
  566         }
  567 
  568         if (! bp->bio_bcount)
  569                 goto xit;
  570 
  571         t->flags &= ~TPEXCEP;
  572         s = splbio ();
  573         if (wtstart (t, bp->bio_cmd == BIO_READ ? ISADMA_READ : ISADMA_WRITE, 
  574             bp->bio_data, bp->bio_bcount)) {
  575                 wtwait (t, 0, (bp->bio_cmd == BIO_READ) ? "wtread" : "wtwrite");
  576                 bp->bio_resid -= t->dmacount;
  577         }
  578         splx (s);
  579 
  580         if (t->flags & TPEXCEP) {
  581 errxit:         bp->bio_error = EIO;
  582 err2xit:        bp->bio_flags |= BIO_ERROR;
  583         }
  584 xit:    biodone (bp);
  585         return;
  586 }
  587 
  588 /*
  589  * Interrupt routine.
  590  */
  591 static void
  592 wtintr (int u)
  593 {
  594         wtinfo_t *t = wttab + u;
  595         unsigned char s;
  596 
  597         if (u >= NWT || t->type == UNKNOWN) {
  598                 TRACE (("wtintr() -- device not configured\n"));
  599                 return;
  600         }
  601 
  602         s = inb (t->STATPORT);                  /* get status */
  603         TRACE (("wtintr() status=0x%x -- ", s));
  604         if ((s & (t->BUSY | t->NOEXCEP)) == (t->BUSY | t->NOEXCEP)) {
  605                 TRACE (("busy\n"));
  606                 return;                         /* device is busy */
  607         }
  608 
  609         /*
  610          * Check if rewind finished.
  611          */
  612         if (t->flags & TPREW) {
  613                 TRACE (((s & (t->BUSY | t->NOEXCEP)) == (t->BUSY | t->NOEXCEP) ?
  614                         "rewind busy?\n" : "rewind finished\n"));
  615                 t->flags &= ~TPREW;             /* Rewind finished. */
  616                 wtsense (t, 1, TP_WRP);
  617                 wakeup ((caddr_t)t);
  618                 return;
  619         }
  620 
  621         /*
  622          * Check if writing/reading of file mark finished.
  623          */
  624         if (t->flags & (TPRMARK | TPWMARK)) {
  625                 TRACE (((s & (t->BUSY | t->NOEXCEP)) == (t->BUSY | t->NOEXCEP) ?
  626                         "marker r/w busy?\n" : "marker r/w finished\n"));
  627                 if (! (s & t->NOEXCEP))         /* operation failed */
  628                         wtsense (t, 1, (t->flags & TPRMARK) ? TP_WRP : 0);
  629                 t->flags &= ~(TPRMARK | TPWMARK); /* operation finished */
  630                 wakeup ((caddr_t)t);
  631                 return;
  632         }
  633 
  634         /*
  635          * Do we started any i/o?  If no, just return.
  636          */
  637         if (! (t->flags & TPACTIVE)) {
  638                 TRACE (("unexpected interrupt\n"));
  639                 return;
  640         }
  641 
  642         /*
  643          * Clean up dma.
  644          */
  645         if ((t->dmaflags & ISADMA_READ) && (t->dmatotal - t->dmacount) < t->bsize) {
  646                 /* If reading short block, copy the internal buffer
  647                  * to the user memory. */
  648                 isa_dmadone (t->dmaflags, t->buf, t->bsize, t->chan);
  649                 bcopy (t->buf, t->dmavaddr, t->dmatotal - t->dmacount);
  650         } else
  651                 isa_dmadone (t->dmaflags, t->dmavaddr, t->bsize, t->chan);
  652 
  653         t->flags &= ~TPACTIVE;
  654         t->dmacount += t->bsize;
  655         t->dmavaddr = (char *)t->dmavaddr + t->bsize;
  656 
  657         /*
  658          * On exception, check for end of file and end of volume.
  659          */
  660         if (! (s & t->NOEXCEP)) {
  661                 TRACE (("i/o exception\n"));
  662                 wtsense (t, 1, (t->dmaflags & ISADMA_READ) ? TP_WRP : 0);
  663                 if (t->error.err & (TP_EOM | TP_FIL))
  664                         t->flags |= TPVOL;      /* end of file */
  665                 else
  666                         t->flags |= TPEXCEP;    /* i/o error */
  667                 wakeup ((caddr_t)t);
  668                 return;
  669         }
  670 
  671         if (t->dmacount < t->dmatotal) {        /* continue i/o */
  672                 wtdma (t);
  673                 TRACE (("continue i/o, %d\n", t->dmacount));
  674                 return;
  675         }
  676         if (t->dmacount > t->dmatotal)          /* short last block */
  677                 t->dmacount = t->dmatotal;
  678         wakeup ((caddr_t)t);    /* wake up user level */
  679         TRACE (("i/o finished, %d\n", t->dmacount));
  680 }
  681 
  682 /* start the rewind operation */
  683 static void
  684 wtrewind (wtinfo_t *t)
  685 {
  686         int rwmode = (t->flags & (TPRO | TPWO));
  687 
  688         t->flags &= ~(TPRO | TPWO | TPVOL);
  689         /*
  690          * Wangtek strictly follows QIC-02 standard:
  691          * clearing ONLINE in read/write modes causes rewind.
  692          * REWIND command is not allowed in read/write mode
  693          * and gives `illegal command' error.
  694          */
  695         if (t->type==WANGTEK && rwmode) {
  696                 outb (t->CTLPORT, 0);
  697         } else if (! wtcmd (t, QIC_REWIND))
  698                 return;
  699         t->flags |= TPSTART | TPREW;
  700         wtclock (t);
  701 }
  702 
  703 /* start the `read marker' operation */
  704 static int
  705 wtreadfm (wtinfo_t *t)
  706 {
  707         t->flags &= ~(TPRO | TPWO | TPVOL);
  708         if (! wtcmd (t, QIC_READFM)) {
  709                 wtsense (t, 1, TP_WRP);
  710                 return (EIO);
  711         }
  712         t->flags |= TPRMARK | TPRANY;
  713         wtclock (t);
  714         /* Don't wait for completion here. */
  715         return (0);
  716 }
  717 
  718 /* write marker to the tape */
  719 static int
  720 wtwritefm (wtinfo_t *t)
  721 {
  722         tsleep ((caddr_t)wtwritefm, WTPRI, "wtwfm", hz); /* timeout: 1 second */
  723         t->flags &= ~(TPRO | TPWO);
  724         if (! wtcmd (t, QIC_WRITEFM)) {
  725                 wtsense (t, 1, 0);
  726                 return (EIO);
  727         }
  728         t->flags |= TPWMARK | TPWANY;
  729         wtclock (t);
  730         return (wtwait (t, 0, "wtwfm"));
  731 }
  732 
  733 /* while controller status & mask == bits continue waiting */
  734 static int
  735 wtpoll (wtinfo_t *t, int mask, int bits)
  736 {
  737         int s, i;
  738 
  739         /* Poll status port, waiting for specified bits. */
  740         for (i=0; i<1000; ++i) {                        /* up to 1 msec */
  741                 s = inb (t->STATPORT);
  742                 if ((s & mask) != bits)
  743                         return (s);
  744                 DELAY (1);
  745         }
  746         for (i=0; i<100; ++i) {                         /* up to 10 msec */
  747                 s = inb (t->STATPORT);
  748                 if ((s & mask) != bits)
  749                         return (s);
  750                 DELAY (100);
  751         }
  752         for (;;) {                                      /* forever */
  753                 s = inb (t->STATPORT);
  754                 if ((s & mask) != bits)
  755                         return (s);
  756                 tsleep ((caddr_t)wtpoll, WTPRI, "wtpoll", 1); /* timeout: 1 tick */
  757         }
  758 }
  759 
  760 /* execute QIC command */
  761 static int
  762 wtcmd (wtinfo_t *t, int cmd)
  763 {
  764         int s, x;
  765 
  766         TRACE (("wtcmd() cmd=0x%x\n", cmd));
  767         x = splbio();
  768         s = wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP); /* ready? */
  769         if (! (s & t->NOEXCEP)) {                       /* error */
  770                 splx(x);
  771                 return (0);
  772         }
  773 
  774         outb (t->CMDPORT, cmd);                         /* output the command */
  775 
  776         outb (t->CTLPORT, t->REQUEST | t->ONLINE);      /* set request */
  777         wtpoll (t, t->BUSY, t->BUSY);                   /* wait for ready */
  778         outb (t->CTLPORT, t->IEN | t->ONLINE);          /* reset request */
  779         wtpoll (t, t->BUSY, 0);                         /* wait for not ready */
  780         splx(x);
  781         return (1);
  782 }
  783 
  784 /* wait for the end of i/o, seeking marker or rewind operation */
  785 static int
  786 wtwait (wtinfo_t *t, int catch, char *msg)
  787 {
  788         int error;
  789 
  790         TRACE (("wtwait() `%s'\n", msg));
  791         while (t->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK)) {
  792                 error = tsleep ((caddr_t)t, WTPRI | catch, msg, 0);
  793                 if (error)
  794                         return (error);
  795         }
  796         return (0);
  797 }
  798 
  799 /* initialize dma for the i/o operation */
  800 static void
  801 wtdma (wtinfo_t *t)
  802 {
  803         t->flags |= TPACTIVE;
  804         wtclock (t);
  805 
  806         if (t->type == ARCHIVE)
  807                 outb (t->SDMAPORT, 0);          /* set dma */
  808 
  809         if ((t->dmaflags & ISADMA_READ) && (t->dmatotal - t->dmacount) < t->bsize)
  810                 /* Reading short block.  Do it through the internal buffer. */
  811                 isa_dmastart (t->dmaflags, t->buf, t->bsize, t->chan);
  812         else
  813                 isa_dmastart (t->dmaflags, t->dmavaddr, t->bsize, t->chan);
  814 }
  815 
  816 /* start i/o operation */
  817 static int
  818 wtstart (wtinfo_t *t, unsigned flags, void *vaddr, unsigned len)
  819 {
  820         int s, x;
  821 
  822         TRACE (("wtstart()\n"));
  823         x = splbio();
  824         s = wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP); /* ready? */
  825         if (! (s & t->NOEXCEP)) {
  826                 t->flags |= TPEXCEP;            /* error */
  827                 splx(x);
  828                 return (0);
  829         }
  830         t->flags &= ~TPEXCEP;                   /* clear exception flag */
  831         t->dmavaddr = vaddr;
  832         t->dmatotal = len;
  833         t->dmacount = 0;
  834         t->dmaflags = flags;
  835         wtdma (t);
  836         splx(x);
  837         return (1);
  838 }
  839 
  840 /* start timer */
  841 static void
  842 wtclock (wtinfo_t *t)
  843 {
  844         if (! (t->flags & TPTIMER)) {
  845                 t->flags |= TPTIMER;
  846                 /* Some controllers seem to lose dma interrupts too often.
  847                  * To make the tape stream we need 1 tick timeout. */
  848                 timeout (wtimer, (caddr_t)t, (t->flags & TPACTIVE) ? 1 : hz);
  849         }
  850 }
  851 
  852 /*
  853  * Simulate an interrupt periodically while i/o is going.
  854  * This is necessary in case interrupts get eaten due to
  855  * multiple devices on a single IRQ line.
  856  */
  857 static void
  858 wtimer (void *xt)
  859 {
  860         wtinfo_t *t = (wtinfo_t *)xt;
  861         int s;
  862 
  863         t->flags &= ~TPTIMER;
  864         if (! (t->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK)))
  865                 return;
  866 
  867         /* If i/o going, simulate interrupt. */
  868         s = splbio ();
  869         if ((inb (t->STATPORT) & (t->BUSY | t->NOEXCEP)) != (t->BUSY | t->NOEXCEP)) {
  870                 TRACE (("wtimer() -- "));
  871                 wtintr (t->unit);
  872         }
  873         splx (s);
  874 
  875         /* Restart timer if i/o pending. */
  876         if (t->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK))
  877                 wtclock (t);
  878 }
  879 
  880 /* reset the controller */
  881 static int
  882 wtreset (wtinfo_t *t)
  883 {
  884         /* Perform QIC-02 and QIC-36 compatible reset sequence. */
  885         /* Thanks to Mikael Hybsch <micke@dynas.se>. */
  886         int s, i;
  887 
  888         outb (t->CTLPORT, t->RESET | t->ONLINE); /* send reset */
  889         DELAY (30);
  890         outb (t->CTLPORT, t->ONLINE);           /* turn off reset */
  891         DELAY (30);
  892 
  893         /* Read the controller status. */
  894         s = inb (t->STATPORT);
  895         if (s == 0xff)                          /* no port at this address? */
  896                 return (0);
  897 
  898         /* Wait 3 sec for reset to complete. Needed for QIC-36 boards? */
  899         for (i=0; i<3000; ++i) {
  900                 if (! (s & t->BUSY) || ! (s & t->NOEXCEP))
  901                         break;
  902                 DELAY (1000);
  903                 s = inb (t->STATPORT);
  904         }
  905         return ((s & t->RESETMASK) == t->RESETVAL);
  906 }
  907 
  908 /* get controller status information */
  909 /* return 0 if user i/o request should receive an i/o error code */
  910 static int
  911 wtsense (wtinfo_t *t, int verb, int ignor)
  912 {
  913         char *msg = 0;
  914         int err;
  915 
  916         TRACE (("wtsense() ignor=0x%x\n", ignor));
  917         t->flags &= ~(TPRO | TPWO);
  918         if (! wtstatus (t))
  919                 return (0);
  920         if (! (t->error.err & TP_ST0))
  921                 t->error.err &= ~TP_ST0MASK;
  922         if (! (t->error.err & TP_ST1))
  923                 t->error.err &= ~TP_ST1MASK;
  924         t->error.err &= ~ignor;         /* ignore certain errors */
  925         err = t->error.err & (TP_FIL | TP_BNL | TP_UDA | TP_EOM | TP_WRP |
  926                 TP_USL | TP_CNI | TP_MBD | TP_NDT | TP_ILL);
  927         if (! err)
  928                 return (1);
  929         if (! verb)
  930                 return (0);
  931 
  932         /* lifted from tdriver.c from Wangtek */
  933         if      (err & TP_USL)  msg = "Drive not online";
  934         else if (err & TP_CNI)  msg = "No cartridge";
  935         else if ((err & TP_WRP) && !(t->flags & TPWP)) {
  936                 msg = "Tape is write protected";
  937                 t->flags |= TPWP;
  938         }
  939         else if (err & TP_FIL)  msg = 0 /*"Filemark detected"*/;
  940         else if (err & TP_EOM)  msg = 0 /*"End of tape"*/;
  941         else if (err & TP_BNL)  msg = "Block not located";
  942         else if (err & TP_UDA)  msg = "Unrecoverable data error";
  943         else if (err & TP_NDT)  msg = "No data detected";
  944         else if (err & TP_ILL)  msg = "Illegal command";
  945         if (msg)
  946                 printf ("wt%d: %s\n", t->unit, msg);
  947         return (0);
  948 }
  949 
  950 /* get controller status information */
  951 static int
  952 wtstatus (wtinfo_t *t)
  953 {
  954         char *p;
  955         int x;
  956 
  957         x = splbio();
  958         wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP); /* ready? */
  959         outb (t->CMDPORT, QIC_RDSTAT);  /* send `read status' command */
  960 
  961         outb (t->CTLPORT, t->REQUEST | t->ONLINE);      /* set request */
  962         wtpoll (t, t->BUSY, t->BUSY);                   /* wait for ready */
  963         outb (t->CTLPORT, t->ONLINE);                   /* reset request */
  964         wtpoll (t, t->BUSY, 0);                         /* wait for not ready */
  965 
  966         p = (char*) &t->error;
  967         while (p < (char*)&t->error + 6) {
  968                 int s = wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP);
  969                 if (! (s & t->NOEXCEP)) {               /* error */
  970                         splx(x);
  971                         return (0);
  972                 }
  973 
  974                 *p++ = inb (t->DATAPORT);               /* read status byte */
  975 
  976                 outb (t->CTLPORT, t->REQUEST | t->ONLINE); /* set request */
  977                 wtpoll (t, t->BUSY, 0);                 /* wait for not ready */
  978                 DELAY(20);
  979                 outb (t->CTLPORT, t->ONLINE);           /* unset request */
  980         }
  981         splx(x);
  982         return (1);
  983 }

Cache object: 004faf888dfd2e178ff05ed6c0b9a88a


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