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1.1 root 1: /*-
2: * Copyright (c) 1991 The Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. All advertising materials mentioning features or use of this software
14: * must display the following acknowledgement:
15: * This product includes software developed by the University of
16: * California, Berkeley and its contributors.
17: * 4. Neither the name of the University nor the names of its contributors
18: * may be used to endorse or promote products derived from this software
19: * without specific prior written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31: * SUCH DAMAGE.
32: *
33: * @(#)wt.c 7.1 (Berkeley) 5/9/91
34: */
35:
36: /*
37: *
38: * Copyright (c) 1989 Carnegie-Mellon University.
39: * All rights reserved.
40: *
41: * Authors: Robert Baron
42: *
43: * Permission to use, copy, modify and distribute this software and
44: * its documentation is hereby granted, provided that both the copyright
45: * notice and this permission notice appear in all copies of the
46: * software, derivative works or modified versions, and any portions
47: * thereof, and that both notices appear in supporting documentation.
48: *
49: * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
50: * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
51: * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
52: *
53: * Carnegie Mellon requests users of this software to return to
54: *
55: * Software Distribution Coordinator or [email protected]
56: * School of Computer Science
57: * Carnegie Mellon University
58: * Pittsburgh PA 15213-3890
59: *
60: * any improvements or extensions that they make and grant Carnegie the
61: * rights to redistribute these changes.
62: */
63:
64: #include "wt.h"
65: #if NWT > 0
66: /*
67: * HISTORY
1.1.1.4 ! root 68: * $Log: wt.c,v $
! 69: * Revision 1.1.1.1 1993/03/21 09:46:00 cgd
! 70: * initial import of 386bsd-0.1 sources
! 71: *
1.1 root 72: * Revision 2.2.1.3 90/01/08 13:29:38 rvb
73: * Add Intel copyright.
74: * [90/01/08 rvb]
75: *
76: * Revision 2.2.1.2 89/12/21 18:00:09 rvb
77: * Change WTPRI to make the streamer tape read/write
78: * interruptible. [lin]
79: *
80: * Revision 2.2.1.1 89/11/10 09:49:49 rvb
81: * ORC likes their streamer port at 0x288.
82: * [89/11/08 rvb]
83: *
84: * Revision 2.2 89/09/25 12:33:02 rvb
85: * Driver was provided by Intel 9/18/89.
86: * [89/09/23 rvb]
87: *
88: */
89:
90: /*
91: *
92: * Copyright 1988, 1989 by Intel Corporation
93: *
94: * Support Bell Tech QIC-02 and WANGTEK QIC-36 or QIC-02
95: */
96:
97: /*#include <sys/errno.h>
98: #include <sys/signal.h>
99: #include <sys/types.h>*/
100: #include "sys/param.h"
101: #include "sys/buf.h"
102: #include "sys/file.h"
103: #include "sys/proc.h"
104: #include "sys/user.h"
105: #include "i386/isa/wtreg.h"
106:
107: #ifdef ORC
108: unsigned wtport = 0x288; /* base I/O port of controller */
109: #else ORC
110: unsigned wtport = 0x300; /* base I/O port of controller */
111: #endif ORC
112: /* standard = 0x300 */
113: /* alternate = 0x338 */
114:
115: unsigned wtchan = 1; /* DMA channel number */
116: /* stardard = 1 */
117: /* hardware permits 1, 2 or 3. */
118: /* (Avoid DMA 2: used by disks) */
119:
120: int first_wtopen_ever = 1;
121:
122:
123: #define ERROR 1 /* return from tape routines */
124: #define SUCCESS 0 /* return from tape routines */
125:
126: int wci = 0;
127: int exflag = 0;
128: int bytes = 0;
129:
130: static unsigned char eqdma = 0x8;
131: static unsigned char pagereg = 0x83;
132: static unsigned char dmareg = 2;
133: static unsigned char dma_write = 0x49;
134: static unsigned char dma_read = 0x45;
135: static unsigned char dma_done = 2;
136: static unsigned char mode = 0;
137: static unsigned char mbits; /* map bits into each other */
138: static long bufptr;
139: static unsigned numbytes;
140: /*
141: _wci dw 0 ; interrupt chain finished normally
142: _exflag dw 0 ; exception variable
143: _bytes dw 0 ; current bytes
144:
145: eqdma db 8h ; enable dma command: ch1,ch2=8h, ch3=10h
146: pagereg db 83h ; ch1=83h, ch2=81h, ch3=82h
147: dmareg db 2 ; ch1=2, ch2=4, ch3=6
148: dma_write db 49h ; write dma command: 48h+_wtchan
149: dma_read db 45h ; read dma command: 44h+_wtchan
150: dma_done db 2 ; dma done flag: 1<<_wtchan
151: mode db 0 ; dma operation mode
152: lbufptr dw 0 ; buffer pointer to data buffers, low word
153: hbufptr dw 0 ; buffer pointer to data buffers, high word
154: numbytes dw 0 ; number of bytes to read or write (new)
155: */
156:
157: #define PAGESIZ 4096
158: #define HZ 60
159:
160: /* tape controller ports */
161: #define STATPORT wtport
162: #define CTLPORT STATPORT
163: #define CMDPORT (wtport+1)
164: #define DATAPORT CMDPORT
165:
166: /* defines for reading out status from wangtek tape controller */
167: #define READY 0x01 /* ready bit define */
168: #define EXCEP 0x02 /* exception bit define */
169: #define STAT (READY|EXCEP)
170: #define RESETMASK 0x7
171: #define RESETVAL (RESETMASK & ~EXCEP)
172:
173: /* tape controller control bits (CTLPORT) */
174: #define ONLINE 0x01
175: #define RESET 0x02
176: #define REQUEST 0x04 /* request command */
177: #define CMDOFF 0xC0
178:
179: /* QIC-02 commands (CMDPORT) */
180: #define RDDATA 0x80 /* read data */
181: #define READFM 0xA0 /* read file mark */
182: #define WRTDATA 0x40 /* write data */
183: #define WRITEFM 0x60 /* write file mark */
184: #define RDSTAT 0xC0 /* read status command */
185: #define REWIND 0x21 /* rewind command (position+bot) */
186:
187: /* 8237 DMA controller regs */
188: #define STATUSREG 0x8
189: #define MASKREG 0xA
190: #define MODEREG 0xB
191: #define CLEARFF 0xC
192:
193: /* streamer tape block size */
194: #define BLKSIZE 512
195:
196: /* Tape characteristics */
197: #define NBPS 512 /* 512-byte blocks */
198: #define ERROR 1 /* return from tape routines */
199: #define SUCCESS 0 /* return from tape routines */
200:
201: /* Minor devs */
202: #define TP_REWCLOSE(d) ((minor(d)&04) == 0) /* Rewind tape on close if read/write */
203: #define TP_DENS(dev) ((minor(dev) >> 3) & 03) /* set density */
204: #define TPHOG(d) 0 /* use Hogproc during tape I/O */
205:
206: /* defines for wtflags */
207: #define TPINUSE 0x0001 /* tape is already open */
208: #define TPREAD 0x0002 /* tape is only open for reading */
209: #define TPWRITE 0x0004 /* tape is only open for writing */
210: #define TPSTART 0x0008 /* tape must be rewound and reset */
211: #define TPDEAD 0x0010 /* tape drive does not work or driver error */
212: #define TPSESS 0x0020 /* no more reads or writes allowed in session */
213: /* for example, when tape has to be changed */
214: #define TPSTOP 0x0040 /* Stop command outstanding */
215: #define TPREW 0x0080 /* Rewind command outstanding, see wtdsl2() */
216: #define TPVOL 0x0100 /* Read file mark, or hit end of tape */
217: #define TPWO 0x0200 /* write command outstanding */
218: #define TPRO 0x0400 /* read command outstanding */
219: #define TPWANY 0x0800 /* write command requested */
220: #define TPRANY 0x1000 /* read command requested */
221: #define TPWP 0x2000 /* write protect error seen */
222:
223: unsigned int wtflags = TPSTART; /* state of tape drive */
224:
225: struct buf rwtbuf; /* header for raw i/o */
226: struct proc *myproc; /* process which opened tape driver */
227:
228: char wtimeron; /* wtimer() active flag */
229: char wtio; /* dma (i/o) active flag */
230: char isrlock; /* isr() flag */
231:
232: struct proc * Hogproc; /* no Hogproc on Microport */
233: #define ftoseg(x) ((unsigned) (x >> 16))
234:
235: struct wtstatus {
236: ushort wt_err; /* code for error encountered */
237: ushort wt_ercnt; /* number of error blocks */
238: ushort wt_urcnt; /* number of underruns */
239: } wterror;
240:
241: /* defines for wtstatus.wt_err */
242: #define TP_POR 0x100 /* Power on/reset occurred */
243: #define TP_RES1 0x200 /* Reserved for end of media */
244: #define TP_RES2 0x400 /* Reserved for bus parity */
245: #define TP_BOM 0x800 /* Beginning of media */
246: #define TP_MBD 0x1000 /* Marginal block detected */
247: #define TP_NDT 0x2000 /* No data detected */
248: #define TP_ILL 0x4000 /* Illegal command */
249: #define TP_ST1 0x8000 /* Status byte 1 bits */
250: #define TP_FIL 0x01 /* File mark detected */
251: #define TP_BNL 0x02 /* Bad block not located */
252: #define TP_UDA 0x04 /* Unrecoverable data error */
253: #define TP_EOM 0x08 /* End of media */
254: #define TP_WRP 0x10 /* Write protected cartridge */
255: #define TP_USL 0x20 /* Unselected drive */
256: #define TP_CNI 0x40 /* Cartridge not in place */
257: #define TP_ST0 0x80 /* Status byte 0 bits */
258:
259: /* Grounds for reporting I/O error to user */
260: #define TP_ERR0 (TP_BNL|TP_UDA|TP_WRP|TP_CNI|TP_FIL|TP_EOM|TP_USL)
261: #define TP_ERR1 (TP_MBD|TP_NDT|TP_ILL)
262: /* TP_ILL should never happen! */
263: /*
264: #define TP_ERR0 0x7f
265: #define TP_ERR1 0x7700
266: */
267:
268: /* defines for reading out status from wangtek tape controller */
269: #define READY 0x01 /* ready bit define */
270: #define EXCEP 0x02 /* exception bit define */
271:
272: /* sleep priority */
273: #define WTPRI (PZERO+10)
274:
275: char pagebuf[NBPS]; /* buffer of size NBPS */
276: unsigned long pageaddr; /* physical addr of pagebuf */
277: /* pageaddr is used with DMA controller */
278: time_t Hogtime; /* lbolt when Hog timer started */
279: extern time_t lbolt;
280:
281: #define debug printf
282:
283: /*
284: * Strategy routine.
285: *
286: * Arguments:
287: * Pointer to buffer structure
288: * Function:
289: * Start transfer.
290: *
291: * It would be nice to have this multiple-threaded.
292: * There is a version of dump from Berkeley that works with multiple processes
293: * trading off with disk & tape I/O.
294: */
295:
296: int
297: wtstrategy(bp)
298: register struct buf *bp;
299: {
300: unsigned ucnt1, ucnt2, finished;
301: unsigned long adr1, adr2;
302: int bad;
303:
304: adr1 = kvtop(bp->b_un.b_addr);
305: #ifdef DEBUG
306: debug("bpaddr %x\n", adr1);
307: #endif
1.1.1.3 root 308: ucnt1 = bp->b_bcount % NBPG;
1.1 root 309: ucnt2 = 0;
310: adr2 = 0;
311: #ifdef DEBUG
312: debug("WTstart: adr1 %lx cnt %x\n", adr1, ucnt1);
313: #endif
1.1.1.3 root 314: /* 64K boundary? (XXX) */
1.1 root 315: if (ftoseg(adr1) != ftoseg(adr1 + (unsigned) ucnt1 - 1))
316: {
317: adr2 = (adr1 & 0xffff0000L) + 0x10000L;
318: ucnt2 = (adr1 + ucnt1) - adr2;
319: ucnt1 -= ucnt2;
320: }
1.1.1.3 root 321: /* page boundary? */
322: if (trunc_page(adr1) != trunc_page(adr1 + (unsigned) ucnt1 - 1))
323: { unsigned u;
324: u = NBPG - ((unsigned)bp->b_un.b_addr & (NBPG-1));
325: adr2 = kvtop(bp->b_un.b_addr + u);
326: ucnt2 = ucnt1 - u;
327: ucnt1 = u;
328: }
1.1 root 329: /* at file marks and end of tape, we just return '0 bytes available' */
330: if (wtflags & TPVOL) {
331: bp->b_resid = bp->b_bcount;
332: goto xit;
333: }
334: if ((Hogproc == (struct proc *) 0) && TPHOG(bp->b_dev))
335: {
336: #ifdef DEBUG
337: printf("setting Hogproc\n");
338: #endif
339: Hogtime = 0;
340: Hogproc = myproc;
341: }
342: if (bp->b_flags & B_READ) {
343: bad = 0;
344:
345: /* For now, we assume that all data will be copied out */
346: /* If read command outstanding, just skip down */
347: if (!(wtflags & TPRO)) {
348: if (ERROR == wtsense(TP_WRP)) /* clear status */
349: goto errxit;
350: #ifdef DEBUG
351: debug("WTread: Start read\n");
352: #endif
353: if (!(wtflags & TPREAD) || (wtflags & TPWANY) ||
354: (rstart() == ERROR)) {
355: #ifdef DEBUG
356: debug("Tpstart: read init error\n"); /* */
357: #endif
358: goto errxit;
359: }
360: wtflags |= TPRO|TPRANY;
361: }
362:
363: finished = 0;
364: /* Take a deep breath */
365: if (ucnt1) {
366: if ((rtape(adr1, ucnt1) == ERROR) &&
367: (wtsense(TP_WRP) == ERROR))
368: goto endio;
369: /* wait for it */
370: bad = pollrdy();
371: finished = bytes;
372: if (bad)
373: goto endio;
374: }
375: /* if a second I/O region, start it */
376: if (ucnt2) {
377: if ((rtape(adr2, ucnt2) == ERROR) &&
378: (wtsense(TP_WRP) == ERROR))
379: ucnt2 = 0; /* don't poll for me */
380: }
381:
382: /* if second i/o pending wait for it */
383: if (ucnt2) {
384: pollrdy();
385: /* whether pollrdy is ok or not */
386: finished += bytes;
387: }
388: } else {
389: if (wtflags & TPWP) /* write protected */
390: goto errxit;
391:
392: /* If write command outstanding, just skip down */
393: if (!(wtflags & TPWO)) {
394: if (ERROR == wtsense(0)) /* clear status */
395: {
396: #ifdef DEBUG
397: debug("TPstart: sense 0\n");
398: #endif
399: goto errxit;
400: }
401: if (!(wtflags & TPWRITE) || (wtflags & TPRANY) ||
402: (wstart() == ERROR)) {
403: #ifdef DEBUG
404: debug("Tpstart: write init error\n"); /* */
405: #endif
406: wtsense(0);
407:
408: errxit: bp->b_flags |= B_ERROR;
409: bp->b_resid = bp->b_bcount;
410: goto xit;
411: }
412: wtflags |= TPWO|TPWANY;
413: }
414:
415: /* and hold your nose */
416: if (ucnt1 && ((wtape(adr1, ucnt1) == ERROR)
417: && (wtsense(0) == ERROR)))
418: finished = bytes;
419:
420: else if (ucnt2 &&
421: (((ucnt1 && pollrdy()) ||
422: (wtape(adr2, ucnt2) == ERROR)) &&
423: (wtsense(0) == ERROR)))
424: finished = ucnt1 + NBPS + bytes;
425: /* All writes and/or copyins were fine! */
426: else
427: finished = bp->b_bcount;
428: bad = pollrdy();
429: }
430:
431: endio:
432: if(bad == EIO) bad = 0;
433: wterror.wt_err = 0;
434: if (exflag && wtsense((bp->b_flags & B_READ) ? TP_WRP : 0)) {
435: if ((wterror.wt_err & TP_ST0)
436: && (wterror.wt_err & (TP_FIL|TP_EOM))) {
437: #ifdef DEBUG
438: debug("WTsta: Hit end of tape\n"); /* */
439: #endif
440: wtflags |= TPVOL;
441: if (wterror.wt_err & TP_FIL) {
442: if (wtflags & TPRO)
443: /* interrupter is bogus */
444: rstart(); /* restart read command */
445: else
446: wtflags &= ~TPWO;
447: finished += NBPS;
448: }
449: /* Reading file marks or writing end of tape return 0 bytes */
450: } else {
451: bp->b_flags |= B_ERROR;
452: wtflags &= ~(TPWO|TPRO);
453: }
454: }
455:
456: if(bad) {
457: bp->b_flags |= B_ERROR;
458: bp->b_error = bad;
459: }
460: bp->b_resid = bp->b_bcount - finished;
461: xit:
462: biodone(bp);
463: if (wtimeron)
464: Hogtime = lbolt;
465: else if (Hogproc == myproc)
466: Hogproc = (struct proc *) 0;
467: }
468:
469: /*
470: * simulate an interrupt periodically while I/O is going
471: * this is necessary in case interrupts get eaten due to
472: * multiple devices on a single IRQ line
473: */
474: wtimer()
475: {
476: /* If I/O going and not in isr(), simulate interrupt
477: * If no I/O for at least 1 second, stop being a Hog
478: * If I/O done and not a Hog, turn off wtimer()
479: */
480: if (wtio && !isrlock)
481: isr();
482:
483: if ((Hogproc == myproc) && Hogtime && (lbolt-Hogtime > HZ))
484: Hogproc = (struct proc *) 0;
485:
486: if (wtio || (Hogproc == myproc))
487: timeout(wtimer, (caddr_t) 0, HZ);
488: else
489: wtimeron = 0;
490: }
491:
492:
493: wtrawio(bp)
494: struct buf *bp;
495: {
496: wtstrategy(bp);
497: biowait(bp);
498: return(0);
499: }
500:
501: /*
502: * ioctl routine
503: * for user level QIC commands only
504: */
505: wtioctl(dev, cmd, arg, mode)
506: int dev, cmd;
507: unsigned long arg;
508: int mode;
509: {
510: if (cmd == WTQICMD)
511: {
512: if ((qicmd((int)arg) == ERROR) || (rdyexc(HZ) == ERROR))
513: {
514: wtsense(0);
515: return(EIO);
516: }
517: return(0);
518: }
519: return(EINVAL);
520: }
521:
522: /*
523: * open routine
524: * called on every device open
525: */
526: wtopen(dev, flag)
527: int dev, flag;
528: {
529: if (first_wtopen_ever) {
530: wtinit();
531: first_wtopen_ever = 0;
532: }
533: #ifdef DEBUG
534: printf("wtopen ...\n");
535: #endif
536: if (!pageaddr) {
537: return(ENXIO);
538: }
539: if (wtflags & (TPINUSE)) {
540: return(ENXIO);
541: }
542: if (wtflags & (TPDEAD)) {
543: return(EIO);
544: }
545: /* If a rewind from the last session is going on, wait */
546: while(wtflags & TPREW) {
547: #ifdef DEBUG
548: debug("Waiting for rew to finish\n");
549: #endif
1.1.1.3 root 550: DELAY(1000000); /* delay one second */
1.1 root 551: }
552: /* Only do reset and select when tape light is off, and tape is rewound.
553: * This allows multiple volumes. */
554: if (wtflags & TPSTART) {
555: if (t_reset() != SUCCESS) {
556: return(ENXIO);
557: }
558: #ifdef DEBUG
559: debug("reset done. calling wtsense\n");
560: #endif
561: if (wtsense(TP_WRP) == ERROR) {
562: return (EIO);
563: }
564: #ifdef DEBUG
565: debug("wtsense done\n");
566: #endif
567: wtflags &= ~TPSTART;
568: }
569:
570: wtflags = TPINUSE;
571: if (flag & FREAD)
572: wtflags |= TPREAD;
573: if (flag & FWRITE)
574: wtflags |= TPWRITE;
575: rwtbuf.b_flags = 0;
576: myproc = curproc; /* for comparison */
1.1.1.3 root 577: #ifdef not
1.1 root 578: switch(TP_DENS(dev)) {
579: case 0:
580: cmds(0x28);
581: break;
582: case 1:
583: cmds(0x29);
584: break;
585: case 2:
586: cmds(0x27);
587: break;
588: case 3:
589: cmds(0x24);
590: }
1.1.1.3 root 591: #endif
1.1 root 592: return(0);
593: }
594:
595: /*
596: * close routine
597: * called on last device close
598: * If not rewind-on-close, leave read or write command intact.
599: */
600: wtclose(dev)
601: {
602: int wtdsl2();
603:
604: #ifdef DEBUG
605: debug("WTclose:\n");
606: #endif
607: if (Hogproc == myproc)
608: Hogproc = (struct proc *) 0;
609: if (!exflag && (wtflags & TPWANY) && !(wtflags & (TPSESS|TPDEAD))) {
610: if (!(wtflags & TPWO))
611: wstart();
612: #ifdef DEBUG
613: debug("WT: Writing file mark\n");
614: #endif
615: wmark(); /* write file mark */
616: #ifdef DEBUG
617: debug("WT: Wrote file mark, going to wait\n");
618: #endif
619: if (rdyexc(HZ/10) == ERROR) {
620: wtsense(0);
621: }
622: }
623: if (TP_REWCLOSE(dev) || (wtflags & (TPSESS|TPDEAD))) {
624: /* rewind tape to beginning of tape, deselect tape, and make a note */
625: /* don't wait until rewind, though */
626: /* Ending read or write causes rewind to happen, if no error,
627: * and READY and EXCEPTION stay up until it finishes */
628: if (wtflags & (TPRO|TPWO))
629: {
630: #ifdef DEBUG
631: debug("End read or write\n");
632: #endif
633: rdyexc(HZ/10);
634: ioend();
635: wtflags &= ~(TPRO|TPWO);
636: }
637: else wtwind();
638: wtflags |= TPSTART | TPREW;
639: timeout(wtdsl2, 0, HZ);
640: }
641: else if (!(wtflags & (TPVOL|TPWANY)))
642: {
643: /* space forward to after next file mark no writing done */
644: /* This allows skipping data without reading it.*/
645: #ifdef DEBUG
646: debug("Reading past file mark\n");
647: #endif
648: if (!(wtflags & TPRO))
649: rstart();
650: rmark();
651: if (rdyexc(HZ/10))
652: {
653: wtsense(TP_WRP);
654: }
655: }
656: wtflags &= TPREW|TPDEAD|TPSTART|TPRO|TPWO;
657: return(0);
658: }
659:
660: /* return ERROR if user I/O request should receive an I/O error code */
661:
662: wtsense(ignor)
663: {
664: wtflags &= ~(TPRO|TPWO);
665: #ifdef DEBUGx
666: debug("WTsense: start ");
667: #endif
668: if (rdstatus(&wterror) == ERROR)
669: {
670: #ifdef DEBUG
671: debug("WTsense: Can't read status\n");
672: #endif
673: return(ERROR);
674: }
675: #ifdef DEBUG
676: if (wterror.wt_err & (TP_ST0|TP_ST1))
677: {
678: debug("Tperror: status %x error %d underruns %d\n",
679: wterror.wt_err, wterror.wt_ercnt, wterror.wt_urcnt);
680: }
681: else
682: debug("done. no error\n");
683: #endif
684: wterror.wt_err &= ~ignor; /* ignore certain errors */
685: reperr(wterror.wt_err);
686: if (((wterror.wt_err & TP_ST0) && (wterror.wt_err & TP_ERR0)) ||
687: ((wterror.wt_err & TP_ST1) && (wterror.wt_err & TP_ERR1)))
688: return ERROR;
689:
690: return SUCCESS;
691: }
692:
693: /* lifted from tdriver.c from Wangtek */
694: reperr(srb0)
695: int srb0;
696: {
697: int s0 = srb0 & (TP_ERR0|TP_ERR1); /* find out which exception to report */
698:
699: if (s0) {
700: if (s0 & TP_USL)
701: sterr("Drive not online");
702: else if (s0 & TP_CNI)
703: sterr("No cartridge");
704: else if ((s0 & TP_WRP) && !(wtflags & TPWP))
705: {
706: sterr("Tape is write protected");
707: wtflags |= TPWP;
708: }
709: /*
710: if (s0 & TP_FIL)
711: sterr("Filemark detected");
712: */
713: else if (s0 & TP_BNL)
714: sterr("Block in error not located");
715: else if (s0 & TP_UDA)
716: sterr("Unrecoverable data error");
717: /*
718: else if (s0 & TP_EOM)
719: sterr("End of tape");
720: */
721: else if (s0 & TP_NDT)
722: sterr("No data detected");
723: /*
724: if (s0 & TP_POR)
725: sterr("Reset occured");
726: */
727: else if (s0 & TP_BOM)
728: sterr("Beginning of tape");
729: else if (s0 & TP_ILL)
730: sterr("Illegal command");
731: }
732: }
733:
734: sterr(errstr)
735: char *errstr;
736: {
737: printf("Streamer: %s\n", errstr);
738: }
739:
740: /* Wait until rewind finishes, and deselect drive */
741: wtdsl2() {
742: int stat;
743:
744: stat = inb(wtport) & (READY|EXCEP);
745: #ifdef DEBUG
746: debug("Timeout: Waiting for rewind to finish: stat %x\n", stat);
747: #endif
748: switch (stat) {
749: /* They're active low, ya'know */
750: case READY|EXCEP:
751: timeout(wtdsl2, (caddr_t) 0, HZ);
752: return;
753: case EXCEP:
754: wtflags &= ~TPREW;
755: return;
756: case READY:
757: case 0:
758: wtflags &= ~TPREW;
759: sterr("Rewind failed");
760: wtsense(TP_WRP);
761: return;
762: }
763: }
764:
765: wtwind() {
766: #ifdef DEBUG
767: debug("WT: About to rewind\n");
768: #endif
769: rwind(); /* actually start rewind */
770: }
771:
772: wtintr(unit) {
773: if (wtflags & (TPWO|TPRO))
774: {
775: isrlock = 1;
776: if (wtio) isr();
777: isrlock = 0;
778: }
779: }
780:
781: wtinit() {
782: if (wtchan < 1 || wtchan > 3)
783: {
784: sterr("Bad DMA channel, cannot init driver");
785: return;
786: }
787: wtlinit(); /* init assembly language variables */
788: pageset();
789: }
790:
791: rdyexc(ticks)
792: {
793: int s;
794: #ifdef DEBUG
795: int os = 0xffff; /* force printout first time */
796: #endif
797: for (;;) { /* loop until ready or exception */
798: s=(inb(wtport) & 0xff); /* read the status register */
799: #ifdef DEBUG
800: if (os != s) {
801: debug("Status reg = %x\n", s); /* */
802: os = s;
803: }
804: #endif
805: if (!(s & EXCEP)) /* check if exception have occured */
806: break;
807: if (!(s & READY)) /* check if controller is ready */
808: break;
809: s = splbio();
1.1.1.3 root 810: DELAY((ticks/HZ)*1000000); /* */
1.1 root 811: splx(s);
812: }
813: #ifdef DEBUG
814: debug("Status reg = %x on return\n", s); /* */
815: #endif
816: return((s & EXCEP)?SUCCESS:ERROR); /* return exception if it occured */
817: }
818:
819: pollrdy()
820: {
821: int sps;
822: #ifdef DEBUG
823: debug("Pollrdy\n");
824: #endif
825: sps = splbio();
826: while (wtio) {
827: int error;
828:
829: if (error = tsleep((caddr_t)&wci, WTPRI | PCATCH,
830: "wtpoll", 0)) {
831: splx(sps);
832: return(error);
833: }
834: }
835: splx(sps);
836: #ifdef DEBUG
837: debug("Finish poll, wci %d exflag %d\n", wci, exflag);
838: #endif
839: return (EIO);
840: }
841:
842: wtdma() /* start up i/o operation, called from dma() in wtlib1.s */
843: {
844: wtio = 1;
845: if (!wtimeron)
846: {
847: wtimeron = 1;
848: timeout(wtimer, (caddr_t) 0, HZ/2);
849: }
850: }
851:
852: wtwake() /* end i/o operation, called from isr() in wtlib1.s */
853: {
854: wtio = 0;
855: wakeup(&wci);
856: }
857:
858: pageset()
859: {
860: unsigned long pp;
861:
862: pp = (unsigned long) pagebuf;
863: pageaddr = kvtop(pp);
864: #ifdef DEBUG
865: debug("pageset: addr %lx\n", pageaddr);
866: #endif
867: }
868:
869:
870:
871: #define near
872:
873: static near
874: sendcmd()
875: {
876: /* desired command in global mbits */
877:
878: outb(CTLPORT, mbits | REQUEST); /* set request */
879: while (inb(STATPORT) & READY); /* wait for ready */
880: outb(CTLPORT, mbits & ~REQUEST); /* reset request */
881: while ((inb(STATPORT) & READY) == 0); /* wait for not ready */
882: }
883:
884: static near /* execute command */
885: cmds(cmd)
886: {
887: register s;
888:
889: do s = inb(STATPORT);
890: while ((s & STAT) == STAT); /* wait for ready */
891:
892: if ((s & EXCEP) == 0) /* if exception */
893: return ERROR; /* error */
894:
895: outb(CMDPORT, cmd); /* output the command */
896:
897: outb(CTLPORT, mbits=ONLINE); /* set & send ONLINE */
898: sendcmd();
899:
900: return SUCCESS;
901: }
902:
903: qicmd(cmd)
904: {
905: return cmds(cmd);
906: }
907:
908: rstart()
909: {
910: return cmds(RDDATA);
911: }
912:
913: rmark()
914: {
915: return cmds(READFM);
916: }
917:
918: wstart()
919: {
920: return cmds(WRTDATA);
921: }
922:
923: ioend()
924: {
925: register s;
926: register rval = SUCCESS;
927:
928: do s = inb(STATPORT);
929: while ((s & STAT) == STAT); /* wait for ready */
930:
931: if ((s & EXCEP) == 0) /* if exception */
932: rval = ERROR; /* error */
933:
934: mbits &= ~ONLINE;
935: outb(CTLPORT, mbits); /* reset ONLINE */
936: outb(MASKREG, wtchan+4); /* turn off dma */
937: outb(CLEARFF, 0); /* reset direction flag */
938:
939: return rval;
940: }
941:
942: wmark()
943: {
944: register s;
945:
946: if (cmds(WRITEFM) == ERROR)
947: return ERROR;
948:
949: do s = inb(STATPORT);
950: while ((s & STAT) == STAT); /* wait for ready */
951:
952: if ((s & EXCEP) == 0) /* if exception */
953: return ERROR; /* error */
954:
955: return SUCCESS;
956: }
957:
958: rwind()
959: {
960: register s;
961:
962: mbits = CMDOFF;
963:
964: do s = inb(STATPORT);
965: while ((s & STAT) == STAT); /* wait for ready */
966:
967: outb(CMDPORT, REWIND);
968: sendcmd();
969:
970: return SUCCESS;
971: }
972:
973: rdstatus(stp)
974: char *stp; /* pointer to 6 byte buffer */
975: {
976: register s;
977: int n;
978:
979: do s = inb(STATPORT);
980: while ((s & STAT) == STAT); /* wait for ready or exception */
981:
982: outb(CMDPORT, RDSTAT);
983: sendcmd(); /* send read status command */
984:
985: for (n=0; n<6; n++)
986: {
987: #ifdef DEBUGx
988: debug("rdstatus: waiting, byte %d\n", n);
989: #endif
990: do s = inb(STATPORT);
991: while ((s & STAT) == STAT); /* wait for ready */
992: #ifdef DEBUGx
993: debug("rdstatus: done\n");
994: #endif
995: if ((s & EXCEP) == 0) /* if exception */
996: return ERROR; /* error */
997:
998: *stp++ = inb(DATAPORT); /* read status byte */
999:
1000: outb(CTLPORT, mbits | REQUEST); /* set request */
1001: #ifdef DEBUGx
1002: debug("rdstatus: waiting after request, byte %d\n", n);
1003: #endif
1004: while ((inb(STATPORT)&READY) == 0); /* wait for not ready */
1005: for (s=100; s>0; s--); /* wait an additional time */
1006:
1007: outb(CTLPORT, mbits & ~REQUEST);/* unset request */
1008: #ifdef DEBUGx
1009: debug("rdstatus: done\n");
1010: #endif
1011: }
1012: return SUCCESS;
1013: }
1014:
1015: t_reset()
1016: {
1017: register i;
1018: mbits |= RESET;
1019: outb(CTLPORT, mbits); /* send reset */
1.1.1.3 root 1020: DELAY(20);
1.1 root 1021: mbits &= ~RESET;
1022: outb(CTLPORT, mbits); /* turn off reset */
1023: if ((inb(STATPORT) & RESETMASK) == RESETVAL)
1024: return SUCCESS;
1025: return ERROR;
1026: }
1027:
1028: static
1029: dma()
1030: {
1031: int x=splbio();
1032: wtdma();
1033: outb(CLEARFF, 0);
1034: outb(MODEREG, mode); /* set dma mode */
1035: outb(dmareg, bufptr & 0xFF);
1036: outb(dmareg, (bufptr>>8) & 0xFF);
1037: outb(pagereg, (bufptr>>16) & 0xFF);
1038: outb(dmareg+1, (BLKSIZE-1) & 0xFF);
1039: outb(dmareg+1, (BLKSIZE-1) >> 8);
1040: outb(wtport, eqdma+ONLINE);
1041: outb(MASKREG, wtchan); /* enable command to 8237, start dma */
1042: splx(x);
1043: }
1044:
1045: static near
1046: wtstart(buf, cnt)
1047: long buf;
1048: int cnt;
1049: {
1050: register s;
1051:
1052: bufptr = buf; /* init statics */
1053: numbytes = cnt;
1054: wci = 0; /* init flags */
1055: exflag = 0;
1056: bytes = 0; /* init counter */
1057:
1058: do s = inb(STATPORT) & STAT;
1059: while (s == STAT); /* wait for ready or error */
1060:
1061: if (s & EXCEP) /* no error */
1062: {
1063: dma();
1064: return SUCCESS;
1065: }
1066: return ERROR; /* error */
1067: }
1068:
1069: rtape(buf, cnt)
1070: long buf; /* physical address */
1071: int cnt; /* number of bytes */
1072: {
1073: mode = dma_read;
1074: return wtstart(buf,cnt);
1075: }
1076:
1077: wtape(buf, cnt)
1078: long buf; /* physical address */
1079: int cnt; /* number of bytes */
1080: {
1081: mode = dma_write;
1082: return wtstart(buf,cnt);
1083: }
1084:
1085: isr()
1086: {
1087: int stat = inb(wtport);
1088: if (!(stat & EXCEP)) /* exception during I/O */
1089: {
1090: if (bytes + BLKSIZE >= numbytes) wci = 1;
1091: exflag = 1;
1092: goto isrwake;
1093: }
1094: if ((stat & READY) || !(inb(STATUSREG) & dma_done))
1095: return;
1096: exflag = 0;
1097: outb(wtport, ONLINE);
1098: bytes += BLKSIZE;
1099: if (bytes >= numbytes) /* normal completion of I/O */
1100: {
1101: wci = 1;
1102: isrwake:
1103: outb(MASKREG, 4+wtchan); /* turn off dma */
1104: wtwake(); /* wake up user level */
1105: }
1106: else
1107: { /* continue I/O */
1108: bufptr += BLKSIZE;
1109: dma();
1110: }
1111: }
1112:
1113: wtlinit()
1114: {
1115: switch (wtchan) {
1116: case 1:
1117: return;
1118: case 2:
1119: pagereg = 0x81;
1120: dma_done = 4;
1121: break;
1122: case 3:
1123: eqdma = 0x10;
1124: pagereg = 0x82;
1125: dma_done = 8;
1126: break;
1127: }
1128: dma_write = wtchan+0x48;
1129: dma_read = wtchan+0x44;
1130: dmareg = wtchan+wtchan;
1131: }
1132:
1133: wtsize()
1134: {
1135: }
1136:
1137: wtdump()
1138: {
1139: }
1140:
1141: #include "i386/isa/isa_device.h"
1142: #include "i386/isa/icu.h"
1143:
1144: int wtprobe(), wtattach();
1145: struct isa_driver wtdriver = {
1146: wtprobe, wtattach, "wt",
1147: };
1148:
1149: wtprobe(dvp)
1150: struct isa_device *dvp;
1151: {
1152: int val,i,s;
1153:
1154: #ifdef lint
1155: wtintr(0);
1156: #endif
1157:
1158: wtport = dvp->id_iobase;
1159: if(t_reset() != SUCCESS) return(0);
1160: return(1);
1161: }
1162:
1163: wtattach() { }
1164:
1165: #endif NWT
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