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*/
1 /* $Id: tpqic02.c,v 0.2.1.21 1993/06/18 19:04:33 root Exp root $
2 *
3 * Driver for tape drive support for Linux-i386 0.99.12.
4 *
5 * Copyright (c) 1993 by H. H. Bergman. All rights reserved.
6 * Current e-mail address: csg279@wing.rug.nl
7 * [If you are unable to reach me directly, try the TAPE mailing list
8 * channel on linux-activists@niksula.hut.fi using "X-Mn-Key: TAPE" as
9 * the first line in your message.]
10 *
11 * Distribution of this program in executable form is only allowed if
12 * all of the corresponding source files are made available through the same
13 * medium at no extra cost.
14 *
15 * I will not accept any responsibility for damage caused directly or
16 * indirectly by this program, or code derived from this program.
17 *
18 * Use this code at your own risk. Don't blame me if it destroys your data!
19 * Make sure you have a backup before you try this code.
20 *
21 * This driver was partially inspired by the 'wt' driver in the 386BSD
22 * source distribution, which carries the following copyright notice:
23 *
24 * Copyright (c) 1991 The Regents of the University of California.
25 * All rights reserved.
26 *
27 * You are not allowed to change this line nor the text above.
28 *
29 * $Log: tpqic02.c,v $
30 * Revision 0.2.1.21 1993/06/18 19:04:33 root
31 * minor fixes for 0.99.10.
32 *
33 * Revision 0.2.1.20 1993/06/11 21:38:51 root
34 * Added exception code for status 0x8000 (Cypher weirdness).
35 *
36 * Revision 0.2.1.19 1993/04/19 23:13:59 root
37 * Cleanups. Changed to 0.99.8.
38 *
39 * Revision 0.2.1.18 1993/03/22 17:39:47 root
40 * Moved to 0.99.7. Added Archive MTSEEK and MTTELL support.
41 *
42 * Revision 0.2.1.17 1993/03/08 18:51:59 root
43 * Tried to `fix' write-once bug in previous release.
44 *
45 * Revision 0.2.1.16 1993/03/01 00:06:16 root
46 * Use register_chrdev() for 0.99.6.
47 *
48 * Revision 0.2.1.15 1993/02/25 00:14:25 root
49 * minor cleanups.
50 *
51 * Revision 0.2.1.14 1993/01/25 00:06:14 root
52 * Kernel udelay. Eof fixups.
53 * Removed report_ read/write dummies; have strace(1) now.
54 *
55 * Revision 0.2.1.13 1993/01/10 02:24:43 root
56 * Rewrote wait_for_ready() to use newer schedule() features.
57 * This improves performance for rewinds etc.
58 *
59 * Revision 0.2.1.12 1993/01/05 18:44:09 root
60 * Changes for 0.99.1. Fixed `restartable reads'.
61 *
62 * Revision 0.2.1.11 1992/11/28 01:19:10 root
63 * Changes to exception handling (significant).
64 * Changed returned error codes. Hopefully they're correct now.
65 * Changed declarations to please gcc-2.3.1.
66 * Patch to deal with bogus interrupts for Archive cards.
67 *
68 * Revision 0.2.1.10 1992/10/28 00:50:44 root
69 * underrun/error counter needed byte swapping.
70 *
71 * Revision 0.2.1.9 1992/10/15 17:06:01 root
72 * Removed online() stuff. Changed EOF handling.
73 *
74 * Revision 0.2.1.8 1992/10/02 22:25:48 root
75 * Removed `no_sleep' parameters (got usleep() now),
76 * cleaned up some comments.
77 *
78 * Revision 0.2.1.7 1992/09/27 01:41:55 root
79 * Changed write() to do entire user buffer in one go, rather than just
80 * a kernel-buffer sized portion each time.
81 *
82 * Revision 0.2.1.6 1992/09/21 02:15:30 root
83 * Introduced udelay() function for microsecond-delays.
84 * Trying to use get_dma_residue rather than TC flags.
85 * Patch to fill entire user buffer on reads before
86 * returning.
87 *
88 * Revision 0.2.1.5 1992/09/19 02:31:28 root
89 * Some changes based on patches by Eddy Olk to
90 * support Archive SC402/SC499R controller cards.
91 *
92 * Revision 0.2.1.4 1992/09/07 01:37:37 root
93 * Minor changes
94 *
95 * Revision 0.2.1.3 1992/08/13 00:11:02 root
96 * Added some support for Archive SC402 and SC499 cards.
97 * (Untested.)
98 *
99 * Revision 0.2.1.2 1992/08/10 02:02:36 root
100 * Changed from linux/system.h macros to asm/dma.h inline functions.
101 *
102 * Revision 0.2.1.1 1992/08/08 01:12:39 root
103 * cleaned up a bit. added stuff for selftesting.
104 * preparing for asm/dma.h instead of linux/system.h
105 *
106 * Revision 0.2 1992/08/03 20:11:30 root
107 * Changed to use new IRQ allocation. Padding now done at runtime, pads to
108 * 512 bytes. Because of this the page regs must be re-programmed every
109 * block! Added hooks for selftest commands.
110 * Moved to linux-0.97.
111 *
112 * Revision 0.1.0.5 1992/06/22 22:20:30 root
113 * moved to Linux 0.96b
114 *
115 * Revision 0.1.0.4 1992/06/18 02:00:04 root
116 * Use minor bit-7 to enable/disable printing of extra debugging info
117 * when do tape access.
118 * Added semop stuff for DMA/IRQ allocation checking. Don't think this
119 * is the right way to do it though.
120 *
121 * Revision 0.1.0.3 1992/06/01 01:57:34 root
122 * changed DRQ to DMA. added TDEBUG ifdefs to reduce output.
123 *
124 * Revision 0.1.0.2 1992/05/31 14:02:38 root
125 * changed SET_DMA_PAGE handling slightly.
126 *
127 * Revision 0.1.0.1 1992/05/27 12:12:03 root
128 * Can now use multiple files on tape (sort of).
129 * First release.
130 *
131 * Revision 0.1 1992/05/26 01:16:31 root
132 * Initial version. Copyright H. H. Bergman 1992
133 *
134 */
135
136 /* After the legalese, now the important bits:
137 *
138 * This is a driver for the Wangtek 5150 tape drive with
139 * a QIC-02 controller for ISA-PC type computers.
140 * Hopefully it will work with other QIC-02 tape drives as well.
141 *
142 * Make sure your setup matches the configuration parameters.
143 * Also, be careful to avoid IO conflicts with other devices!
144 */
145
146 #include <linux/config.h>
147
148 /* skip this driver if not required for this configuration */
149 #if CONFIG_TAPE_QIC02
150
151 /*
152 #define TDEBUG
153 */
154
155 #define REALLY_SLOW_IO /* it sure is ... */
156
157 #include <linux/sched.h>
158 #include <linux/timer.h>
159 #include <linux/fs.h>
160 #include <linux/kernel.h>
161 #include <linux/major.h>
162 #include <linux/errno.h>
163 #include <linux/mtio.h>
164 #include <linux/fcntl.h>
165 #include <linux/delay.h>
166 #include <linux/tpqic02.h>
167
168 #include <asm/dma.h>
169 #include <asm/system.h>
170 #include <asm/io.h>
171 #include <asm/segment.h>
172
173 /* check existence of required configuration parameters */
174 #if !defined(TAPE_QIC02_PORT) || \
175 !defined(TAPE_QIC02_IRQ) || \
176 !defined(TAPE_QIC02_DMA)
177 #error tape_qic02 configuration error
178 #endif
179
180
181 #define TPQIC_NAME "tpqic02"
182
183 /* Linux outb() commands have (value,port) as parameters.
184 * One might expect (port,value) instead, so beware!
185 */
186
187 static volatile int ctlbits = 0; /* control reg bits for tape interface */
188
189 static struct wait_queue *tape_qic02_transfer = NULL; /* sync rw with interrupts */
190
191 static volatile struct mtget ioctl_status; /* current generic status */
192
193 static volatile struct tpstatus tperror; /* last drive status */
194
195 static char rcs_revision[] = "$Revision: 0.2.1.21 $";
196 static char rcs_date[] = "$Date: 1993/06/18 19:04:33 $";
197
198 /* Flag bits for status and outstanding requests.
199 * (Could all be put in one bit-field-struct.)
200 * Some variables need `volatile' because they may be modified
201 * by an interrupt.
202 */
203 static volatile flag status_dead = YES; /* device is legally dead until proven alive */
204 static flag status_open = NO; /* in use or not */
205
206 static volatile flag status_bytes_wr = NO; /* write FM at close or not */
207 static volatile flag status_bytes_rd = NO; /* (rd|wr) used for rewinding */
208
209 static volatile unsigned long status_cmd_pending = 0; /* cmd in progress */
210 static volatile flag status_expect_int = NO; /* ready for interrupts */
211 static volatile flag status_timer_on = NO; /* using time-out */
212 static volatile int status_error = 0; /* int handler may detect error */
213 static volatile flag status_eof_detected = NO; /* end of file */
214 static volatile flag status_eom_detected = NO; /* end of recorded media */
215 static volatile flag status_eot_detected = NO; /* end of tape */
216 static volatile flag doing_read = NO;
217 static volatile flag doing_write = NO;
218
219 static volatile unsigned long dma_bytes_todo;
220 static volatile unsigned long dma_bytes_done;
221 static volatile unsigned dma_mode = 0; /* !=0 also means DMA in use */
222 static flag need_rewind = YES;
223
224 static dev_t current_tape_dev = QIC02_TAPE_MAJOR << 8;
225 static int extra_blocks_left = BLOCKS_BEYOND_EW;
226
227
228 /* return_*_eof:
229 * NO: not at EOF,
230 * YES: tell app EOF was reached (return 0).
231 *
232 * return_*_eof==YES && reported_*_eof==NO ==>
233 * return current buffer, next time(s) return EOF.
234 *
235 * return_*_eof==YES && reported_*_eof==YES ==>
236 * at EOF and application knows it, so we can
237 * move on to the next file.
238 *
239 */
240 static flag return_read_eof = NO; /* set to signal app EOF was reached */
241 static flag return_write_eof = NO;
242 static flag reported_read_eof = NO; /* set when we've done that */
243 static flag reported_write_eof = NO;
244
245
246 #ifdef TP_HAVE_SEEK
247 /* This is for doing `mt seek <blocknr>' */
248 static char seek_addr_buf[SEEK_BUF_SIZE];
249 #endif
250
251
252 /* In write mode, we have to write a File Mark after the last block written,
253 * when the tape device is closed. Tape repositioning and reading in write
254 * mode is allowed as long as no actual writing has been done. After writing
255 * the File Mark, repositioning and reading are allowed again.
256 */
257 static int mode_access; /* access mode: READ or WRITE */
258
259
260 /* This is the actual kernel buffer where the interrupt routines read
261 * from/write to. It is needed because the DMA channels 1 and 3 cannot
262 * access the user buffers. [The kernel buffer must reside in the lower
263 * 1MBytes of system memory because of the DMA controller.]
264 * The user must ensure that a large enough buffer is passed to the
265 * kernel, in order to reduce tape repositioning.
266 *
267 * The buffer is 512 bytes larger than expected, because I want to align it
268 * at 512 bytes, to prevent problems with 64k boundaries.
269 */
270
271 static volatile char tape_qic02_buf[TPQBUF_SIZE+TAPE_BLKSIZE];
272 /* A really good compiler would be able to align this at 512 bytes... :-( */
273
274 static unsigned long buffaddr; /* aligned physical address of buffer */
275
276
277 /* This translates minor numbers to the corresponding recording format: */
278 static char *format_names[] = {
279 "not set", /* for dumb drives unable to handle format selection */
280 "11", /* extinct */
281 "24",
282 "120",
283 "150",
284 "300", /* untested. */
285 "600" /* untested. */
286 };
287
288
289 /* `exception_list' is needed for exception status reporting.
290 * Exceptions 1..14 are defined by QIC-02 rev F.
291 * The drive status is matched sequentially to each entry,
292 * ignoring irrelevant bits, until a match is found. If no
293 * match is found, exception number 0 is used. (That should of
294 * course never happen...) The original table was based on the
295 * "Exception Status Summary" in QIC-02 rev F, but some changes
296 * were required to make it work with real-world drives.
297 *
298 * Exception 1 (CNI) is changed to also cover status 0x00e0 (mask USL),
299 * Exception 4 (EOM) is changed to also cover status 0x8288 (mask EOR),
300 * Exception 11 (FIL) is changed to also cover status 0x0089 (mask EOM).
301 * Exception 15 (EOR) is added for seek-to-end-of-data (catch EOR),
302 * Exception 16 (BOM) is added for beginning-of-media (catch BOM).
303 */
304 static struct exception_list_type {
305 short mask, code;
306 char *msg;
307 } exception_list[] = {
308 {0, 0,
309 "Unknown exception status code", /* extra: 0 */},
310 {~(TP_WRP|TP_USL), TP_ST0|TP_CNI,
311 /* My Wangtek 5150EQ sometimes reports a status code
312 * of 0x00e0, which is not a valid exception code, but
313 * I think it should be recognized as "NO CARTRIDGE".
314 */
315 "Cartridge not in place" /* 1 */},
316 {-1, TP_ST0|TP_CNI|TP_USL|TP_WRP,
317 "Drive not online" /* 2 */},
318 {~(TP_ST1|TP_BOM), TP_ST0|TP_WRP,
319 "Write protected cartridge" /* 3 */},
320 {~(TP_ST1|TP_EOR), TP_ST0|TP_EOM,
321 "End of media" /* 4 */},
322 {~TP_WRP, TP_ST0|TP_UDA| TP_ST1|TP_BOM,
323 "Read or Write abort. Rewind tape." /* 5 */},
324 {~TP_WRP, TP_ST0|TP_UDA,
325 "Read error. Bad block transferred." /* 6 */},
326 {~TP_WRP, TP_ST0|TP_UDA|TP_BNL,
327 "Read error. Filler block transferred." /* 7 */},
328 {~TP_WRP, TP_ST0|TP_UDA|TP_BNL |TP_ST1|TP_NDT,
329 "Read error. No data detected." /* 8 */},
330 {~TP_WRP, TP_ST0|TP_EOM|TP_UDA|TP_BNL |TP_ST1|TP_NDT,
331 "Read error. No data detected. EOM." /* 9 */},
332 {~(TP_WRP|TP_MBD|TP_PAR|TP_EOR), TP_ST0|TP_UDA|TP_BNL |TP_ST1|TP_NDT|TP_BOM,
333 "Read error. No data detected. BOM." /* 10 */},
334 {~(TP_WRP|TP_EOM), TP_ST0|TP_FIL,
335 /* Status 0x0089 (EOM & FM) is viewed as an FM,
336 * because it can only happen during a read.
337 * EOM is checked separately for an FM condition.
338 */
339 "File mark detected" /* 11 */},
340 {~(TP_ST0|TP_CNI|TP_USL|TP_WRP|TP_BOM), TP_ST1|TP_ILL,
341 "Illegal command" /* 12 */},
342 {~(TP_ST0|TP_CNI|TP_USL|TP_WRP|TP_BOM), TP_ST1|TP_POR,
343 "Reset occurred" /* 13 */},
344 {~TP_WRP, TP_ST0|TP_FIL|TP_MBD, /* NOTE: ST1 not set! */
345 "Marginal block detected" /* 14 */},
346 {~(TP_ST0|TP_WRP|TP_EOM|TP_UDA|TP_BNL|TP_FIL |TP_NDT), TP_ST1|TP_EOR,
347 /********** Is the extra TP_NDT really needed Eddy? **********/
348 "End of recorded media" /* extra: 15 */},
349 /* 15 is returned when SEEKEOD completes successfully */
350 {~(TP_WRP|TP_ST0), TP_ST1|TP_BOM,
351 "Beginning of media" /* extra: 16 */}
352 #ifdef CYPHER_BUG
353 /* Perhaps the Cypher driver clears the TP_BOM bit after the
354 * status has been read? The QIC-02 specs explicitly state that
355 * the BOM bit should remain set as long as the tape is logically
356 * at the beginning of the tape.
357 */
358 ,{-1, TP_ST1,
359 "Hmm, this must be Cypher drive... Aaargh" /* extra */}
360 #endif
361 };
362 #define NR_OF_EXC (sizeof(exception_list)/sizeof(struct exception_list_type))
363
364
365
366 static void tpqputs(char *s)
367 {
368 printk(TPQIC_NAME ": %s\n", s);
369 } /* tpqputs */
370
371
372 /* Perform byte order swapping for a 16-bit word.
373 *
374 * [FIXME] This should probably be in include/asm/
375 * ([FIXME] i486 can do this faster)
376 */
377 static inline void byte_swap_w(volatile unsigned short * w)
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*/
378 {
379 int t = *w;
380
381 *w = (t>>8) | ((t & 0xff)<<8);
382 }
383
384
385
386 /* Init control register bits on interface card.
387 * For Archive, interrupts must be enabled explicitly.
388 * Wangtek interface card requires ONLINE to be set, Archive SC402/SC499R
389 * cards keep it active all the time.
390 */
391 static void ifc_init(void)
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*/
392 {
393 #if TAPE_QIC02_IFC == WANGTEK
394 ctlbits = WT_CTL_ONLINE; /* online */
395 outb_p(ctlbits, QIC_CTL_PORT);
396
397 #elif TAPE_QIC02_IFC == ARCHIVE
398 ctlbits = 0; /* no interrupts yet */
399 outb_p(ctlbits, QIC_CTL_PORT);
400 outb_p(0, AR_RESET_DMA_PORT); /* dummy write to reset DMA */
401 #else
402 # error No valid interface card specified
403 #endif
404 } /* ifc_init */
405
406
407 static void report_exception(unsigned n)
/* */
408 {
409 if (n >= NR_OF_EXC) { tpqputs("Oops -- report_exception"); n = 0; }
410 printk(TPQIC_NAME ": sense: %s\n", exception_list[n].msg);
411 } /* report_exception */
412
413
414 /* Try to map the drive-exception bits `s' to a predefined "exception number",
415 * by comparing the significant exception bits for each entry in the
416 * exception table (`exception_list[]').
417 * It is assumed that s!=0.
418 */
419 static int decode_exception_nr(short s) /* s must be short, because of sign-extension */
/* */
420 {
421 int i;
422
423 for (i=1; i<NR_OF_EXC; i++) {
424 if ((s & exception_list[i].mask)==exception_list[i].code)
425 return i;
426 }
427 tpqputs("decode_exception_nr: exception not recognized");
428 return 0;
429 } /* decode_exception_nr */
430
431
432 #ifdef OBSOLETE
433 /* There are exactly 14 possible exceptions, as defined in QIC-02 rev F.
434 * Some are FATAL, some aren't. Currently all exceptions are treated as fatal.
435 * Especially 6 and 14 should not abort the transfer. RSN...
436 * Should probably let sense() figure out the exception number using the code
437 * below, and just report the error based on the number here, returning a code
438 * for FATAL/CONTINUABLE.
439 */
440 static void report_error(int s)
/* */
441 {
442 short n = -1;
443
444 if (s & TP_ST1) {
445 if (s & TP_ILL) /* 12: Illegal command. FATAL */
446 n = 12;
447 if (s & TP_POR) /* 13: Reset occurred. FATAL */
448 n = 13;
449 }
450 else if (s & TP_ST0) {
451 if (s & TP_EOR) { /* extra: 15: End of Recorded Media. CONTINUABLE */
452 n = 15;
453 /********** should set flag here **********/
454 }
455 else if (s & TP_EOM) /* 4: End Of Media. CONTINUABLE */
456 n = 4;
457 else if (s & TP_USL) /* 2: Drive not online. FATAL */
458 n = 2;
459 else if (s & TP_CNI) { /* 1: Cartridge not in place. FATAL */
460 n = 1;
461 need_rewind = YES;
462 status_eof_detected = NO;
463 status_eom_detected = NO;
464 }
465 else if (s & TP_UDA) {
466 if (s & TP_BNL) {
467 if (s & TP_NDT) {
468 if (s & TP_BOM) /* 9: Read error. No data detected & EOM. CONTINUABLE */
469 n = 9;
470 else if (s & TP_EOM) /* 10: Read error. No data detected & BOM. CONTINUABLE */
471 n = 10;
472 else /* 8: Read error. No data detected. CONTINUABLE */
473 n = 8;
474 } else { /* 7: Read error. Cannot recover block, filler substituted. CONTINUABLE */
475 tpqputs("[Bad block -- filler data transferred.]");
476 n = 7;
477 }
478 }
479 else {
480 if (s & TP_EOM) /* 5: Read or Write error. Rewind tape. FATAL */
481 n = 5;
482 else { /* 6: Read error. Bad block transferred. CONTINUABLE */
483 /* block is bad, but transfer may continue.
484 * This is why some people prefer not to
485 * use compression on backups...
486 */
487 tpqputs("[CRC failed!]");
488 n = 6;
489 }
490 }
491 }
492 else if (s & TP_FIL) {
493 if (s & TP_MBD) { /* 14: Marginal block detected. CONTINUABLE */
494 tpqputs("[Marginal block]");
495 n = 14;
496 } else /* 11: File mark detected. CONTINUABLE */
497 n = 11;
498 }
499 else if (s & TP_WRP) /* 3: Write protected cartridge. FATAL */
500 n = 3;
501 }
502 if (n >= 0)
503 sensemsg(n);
504 } /* report_error */
505 #endif
506
507
508 /* perform appropriate action for certain exceptions */
509 static void handle_exception(int exnr, int exbits)
/* */
510 {
511 if (exnr==EXC_NCART) {
512 /* Cartridge was changed. Redo sense().
513 * EXC_NCART should be handled in open().
514 * It is not permitted to remove the tape while
515 * the tape driver has open files.
516 */
517 need_rewind = YES;
518 status_eof_detected = NO;
519 status_eom_detected = NO;
520 }
521 else if (exnr==EXC_XFILLER)
522 tpqputs("[Bad block -- filler data transferred.]");
523 else if (exnr==EXC_XBAD)
524 tpqputs("[CRC failed!]");
525 else if (exnr==EXC_MARGINAL) {
526 /* A marginal block behaves much like a FM.
527 * User may continue reading, if desired.
528 */
529 tpqputs("[Marginal block]");
530 doing_read = NO;
531 } else if (exnr==EXC_FM)
532 doing_read = NO;
533 } /* handle_exception */
534
535
536 static inline int is_exception(void)
/* */
537 {
538 return (inb(QIC_STAT_PORT) & QIC_STAT_EXCEPTION) == 0;
539 } /* is_exception */
540
541
542 /* Reset the tape drive and controller.
543 * When reset fails, it marks the drive as dead and all
544 * requests (except reset) are to be ignored (ENXIO).
545 */
546 static int tape_reset(int verbose)
/* */
547 {
548 ifc_init(); /* reset interface card */
549
550 outb_p(ctlbits | QIC_CTL_RESET, QIC_CTL_PORT); /* assert reset */
551
552 /* Next, we need to wait >=25 usec. */
553 udelay(30);
554
555 /* after reset, we will be at BOT (modulo an automatic rewind) */
556 status_eof_detected = NO;
557 status_eom_detected = NO;
558 status_cmd_pending = 0;
559 need_rewind = YES;
560 doing_read = doing_write = NO;
561 ioctl_status.mt_fileno = ioctl_status.mt_blkno = 0;
562
563 outb_p(ctlbits & ~QIC_CTL_RESET, QIC_CTL_PORT); /* de-assert reset */
564 /* KLUDGE FOR G++ BUG */
565 { int stat = inb_p(QIC_STAT_PORT);
566 status_dead = ((stat & QIC_STAT_RESETMASK) != QIC_STAT_RESETVAL); }
567 /* if successful, inb(STAT) returned RESETVAL */
568 if (status_dead)
569 printk(TPQIC_NAME ": reset failed!\n");
570 else if (verbose)
571 printk(TPQIC_NAME ": reset successful\n");
572
573 return (status_dead)? TE_DEAD : TE_OK;
574 } /* tape_reset */
575
576
577
578 /* Notify tape drive of a new command. It only waits for the
579 * command to be accepted, not for the actual command to complete.
580 *
581 * Before calling this routine, QIC_CMD_PORT must have been loaded
582 * with the command to be executed.
583 * After this routine, the exception bit must be checked.
584 * This routine is also used by rdstatus(), so in that case, any exception
585 * must be ignored (`ignore_ex' flag).
586 */
587 static int notify_cmd(char cmd, short ignore_ex)
/* */
588 {
589 int i;
590
591 outb_p(cmd, QIC_CMD_PORT); /* output the command */
592
593 /* wait 1 usec before asserting /REQUEST */
594 udelay(1);
595
596 if ((!ignore_ex) && is_exception()) {
597 tpqputs("*** exception detected in notify_cmd");
598 /** force a reset here **/
599 if (tape_reset(1)==TE_DEAD)
600 return TE_DEAD;
601 if (is_exception()) {
602 tpqputs("exception persists after reset.");
603 tpqputs(" ^ exception ignored.");
604 }
605 }
606
607 outb_p(ctlbits | QIC_CTL_REQUEST, QIC_CTL_PORT); /* set request bit */
608 i = TAPE_NOTIFY_TIMEOUT;
609 /* The specs say this takes about 500 usec, but there is no upper limit!
610 * If the drive were busy retensioning or something like that,
611 * it could be *much* longer!
612 */
613 while ((inb_p(QIC_STAT_PORT) & QIC_STAT_READY) && (--i>0))
614 /*skip*/; /* wait for ready */
615 if (i==0) {
616 tpqputs("timed out waiting for ready in notify_cmd");
617 status_dead = YES;
618 return TE_TIM;
619 }
620
621 outb_p(ctlbits & ~QIC_CTL_REQUEST, QIC_CTL_PORT); /* reset request bit */
622 i = TAPE_NOTIFY_TIMEOUT;
623 /* according to the specs this one should never time-out */
624 while (((inb_p(QIC_STAT_PORT) & QIC_STAT_READY) == 0) && (--i>0))
625 /*skip*/; /* wait for not ready */
626 if (i==0) {
627 tpqputs("timed out waiting for !ready in notify_cmd");
628 status_dead = YES;
629 return TE_TIM;
630 }
631 /* command accepted */
632 return TE_OK;
633 } /* notify_cmd */
634
635
636
637 /* Wait for a command to complete, with timeout */
638 static int wait_for_ready(time_t timeout)
/* */
639 {
640 int stat;
641 time_t spin_t;
642
643 /* Wait for ready or exception, without driving the loadavg up too much.
644 * In most cases, the tape drive already has READY asserted,
645 * so optimize for that case.
646 *
647 * First, busy wait a few usec:
648 */
649 spin_t = 50;
650 while (((stat = inb_p(QIC_STAT_PORT) & QIC_STAT_MASK) == QIC_STAT_MASK) && (--spin_t>0))
651 /*SKIP*/;
652 if ((stat & QIC_STAT_READY) == 0)
653 return TE_OK; /* covers 99.99% of all calls */
654
655 /* Then use schedule() a few times */
656 spin_t = 3; /* max 0.03 sec busy waiting */
657 if (spin_t > timeout)
658 spin_t = timeout;
659 timeout -= spin_t;
660 spin_t += jiffies;
661
662 while (((stat = inb_p(QIC_STAT_PORT) & QIC_STAT_MASK) == QIC_STAT_MASK) && (jiffies<spin_t))
663 schedule(); /* don't waste all the CPU time */
664 if ((stat & QIC_STAT_READY) == 0)
665 return TE_OK;
666
667 /* If we reach this point, we probably need to wait much longer, or
668 * an exception occurred. Either case is not very time-critical.
669 * Check the status port only a few times every second.
670 * A interval of less than 0.10 sec will not be noticed by the user,
671 * more than 0.40 sec may give noticeable delays.
672 */
673 spin_t += timeout;
674 TPQDEB({printk("wait_for_ready: additional timeout: %d\n", spin_t);})
675
676 /* not ready and no exception && timeout not expired yet */
677 while (((stat = inb_p(QIC_STAT_PORT) & QIC_STAT_MASK) == QIC_STAT_MASK) && (jiffies<spin_t)) {
678 /* be `nice` to other processes on long operations... */
679 current->timeout = jiffies + 30; /* nap 0.30 sec between checks, */
680 current->state = TASK_INTERRUPTIBLE;
681 schedule(); /* but could be woken up earlier by signals... */
682 }
683
684 /* don't use jiffies for this test because it may have changed by now */
685 if ((stat & QIC_STAT_MASK) == QIC_STAT_MASK) {
686 tpqputs("wait_for_ready() timed out");
687 return TE_TIM;
688 }
689
690 if ((stat & QIC_STAT_EXCEPTION) == 0) {
691 tpqputs("exception detected after waiting_for_ready");
692 return TE_EX;
693 } else {
694 return TE_OK;
695 }
696 } /* wait_for_ready */
697
698
699 /* Send some data to the drive */
700 static int send_qic02_data(char sb[], unsigned size, int ignore_ex)
/* */
701 {
702 int i, stat;
703
704 for (i=0; i<size; i++) {
705
706 stat = wait_for_ready(TIM_S);
707 if (stat != TE_OK)
708 return stat;
709
710 stat = notify_cmd(sb[i], ignore_ex);
711 if (stat != TE_OK)
712 return stat;
713 }
714 return TE_OK;
715
716 } /* send_qic02_data */
717
718
719 /* Send a QIC-02 command (`cmd') to the tape drive, with
720 * a time-out (`timeout').
721 * This one is also used by tp_sense(), so we must have
722 * a flag to disable exception checking (`ignore_ex').
723 *
724 * On entry, the controller is supposed to be READY.
725 */
726 static int send_qic02_cmd(int cmd, time_t timeout, int ignore_ex)
/* */
727 {
728 int stat;
729
730 stat = inb_p(QIC_STAT_PORT);
731 if ((stat & QIC_STAT_EXCEPTION) == 0) { /* if exception */
732 tpqputs("send_qic02_cmd: Exception!");
733 return TE_EX;
734 }
735 if (stat & QIC_STAT_READY) { /* if not ready */
736 tpqputs("send_qic02_cmd: not Ready!");
737 return TE_ERR;
738 }
739
740 /* assert(ready & !exception) */
741
742 /* Remember current command for later re-use with dma transfers.
743 * (For reading/writing multiple blocks.)
744 */
745 status_cmd_pending = cmd;
746
747 stat = notify_cmd(cmd, ignore_ex); /* tell drive new command was loaded, */
748 /* inherit exception check. */
749 if (cmd == QCMDV_SEEK_BLK) {
750 /* This one needs to send 3 more bytes, MSB first */
751 stat = send_qic02_data(seek_addr_buf, sizeof(seek_addr_buf), ignore_ex);
752 }
753 if (stat != TE_OK) {
754 tpqputs("send_qic02_cmd failed");
755 }
756 return stat;
757 } /* send_qic02_cmd */
758
759
760
761 /* Get drive status. Assume drive is ready or has exception set.
762 * (or will be in <1000 usec.)
763 * Extra parameters added because of 'Read Extended Status 3' command.
764 */
765 static int rdstatus(char *stp, unsigned size, char qcmd)
/* */
766 {
767 int s, n;
768 char *q = stp;
769
770 /* Try to busy-wait a few (700) usec, after that de-schedule.
771 *
772 * The problem is, if we don't de-schedule, performance will
773 * drop to zero when the drive is not responding and if we
774 * de-schedule immediately, we waste a lot of time because a
775 * task switch is much longer than we usually have to wait here.
776 */
777 n = 1000; /* 500 is not enough on a 486/33 */
778 while ((n>0) && ((inb_p(QIC_STAT_PORT) & QIC_STAT_MASK) == QIC_STAT_MASK))
779 n--; /* wait for ready or exception or timeout */
780 if (n==0) {
781 /* n (above) should be chosen such that on your machine
782 * you rarely ever see the message below, and it should
783 * be small enough to give reasonable response time.]
784 */
785 tpqputs("waiting looong in rdstatus() -- drive dead?");
786 while ((inb_p(QIC_STAT_PORT) & QIC_STAT_MASK) == QIC_STAT_MASK)
787 schedule();
788 tpqputs("finished waiting in rdstatus()");
789 }
790
791 (void) notify_cmd(qcmd, 1); /* send read status command */
792 /* ignore return code -- should always be ok, STAT may contain
793 * exception flag from previous exception which we are trying to clear.
794 */
795
796 if (TP_DIAGS(current_tape_dev))
797 printk(TPQIC_NAME ": reading status bytes: ");
798
799 for (q=stp; q<stp+size; q++)
800 {
801 do s = inb_p(QIC_STAT_PORT);
802 while ((s & QIC_STAT_MASK) == QIC_STAT_MASK); /* wait for ready or exception */
803
804 if ((s & QIC_STAT_EXCEPTION) == 0) { /* if exception */
805 tpqputs("rdstatus: exception error");
806 ioctl_status.mt_erreg = 0; /* dunno... */
807 return TE_NS; /* error, shouldn't happen... */
808 }
809
810 *q = inb_p(QIC_DATA_PORT); /* read status byte */
811
812 if (TP_DIAGS(current_tape_dev))
813 printk("[%1d]=0x%x ", q-stp, (unsigned) (*q) & 0xff);
814
815 outb_p(ctlbits | QIC_CTL_REQUEST, QIC_CTL_PORT); /* set request */
816
817 while ((inb_p(QIC_STAT_PORT) & QIC_STAT_READY) == 0); /* wait for not ready */
818
819 udelay(22); /* delay >20 usec */
820
821 outb_p(ctlbits & ~QIC_CTL_REQUEST, QIC_CTL_PORT); /* un-set request */
822
823 }
824
825 /* Specs say we should wait for READY here.
826 * My drive doesn't seem to need it here yet, but others do?
827 */
828 while (inb_p(QIC_STAT_PORT) & QIC_STAT_READY)
829 /*skip*/; /* wait for ready */
830
831 if (TP_DIAGS(current_tape_dev))
832 printk("\n");
833
834 return TE_OK;
835 } /* rdstatus */
836
837
838
839 /* Get standard status (6 bytes).
840 * The `.dec' and `.urc' fields are in MSB-first byte-order,
841 * so they have to be swapped first.
842 */
843 static int get_status(char *stp)
/* */
844 {
845 int stat = rdstatus(stp, TPSTATSIZE, QCMD_RD_STAT);
846 #if defined(i386) || defined(i486)
847 byte_swap_w(&tperror.dec);
848 byte_swap_w(&tperror.urc);
849 #else
850 /* should probably swap status bytes #definition */
851 #endif
852 return stat;
853 } /* get_status */
854
855
856 #if 0
857 /* This fails for my Wangtek drive */
858 /* get "Extended Status Register 3" (64 bytes)
859 *
860 * If the meaning of the returned bytes were known, the MT_TYPE
861 * identifier could be used to decode them, since they are
862 * "vendor unique". :-(
863 */
864 static int get_ext_status3(void)
/* */
865 {
866 char vus[64]; /* vendor unique status */
867 int stat, i;
868
869 tpqputs("Attempting to read Extended Status 3...");
870 stat = rdstatus(vus, sizeof(vus), QCMD_RD_STAT_X3);
871 if (stat != TE_OK)
872 return stat;
873
874 tpqputs("Returned status bytes:");
875 for (i=0; i<sizeof(vus); i++) {
876 if ( i % 8 == 0 )
877 printk("\n" TPQIC_NAME ": %2d:");
878 printk(" %2x", vus[i] & 0xff);
879 }
880 printk("\n");
881
882 return TE_OK;
883 } /* get_ext_status3 */
884 #endif
885
886
887 /* Read drive status and set generic status too.
888 * NOTE: Once we do a tp_sense(), read/write transfers are killed.
889 */
890 static int tp_sense(int ignore)
/* */
891 {
892 unsigned err = 0, exnr = 0, gs = 0;
893 static void finish_rw(int cmd);
894
895 printk(TPQIC_NAME ": tp_sense(ignore=0x%x) enter\n", ignore);
896
897 /* sense() is not allowed during a read or write cycle */
898 if (doing_write == YES)
899 tpqputs("Warning: File Mark inserted because of sense() request");
900 /* The extra test is to avoid calling finish_rw during booting */
901 if ((doing_read!=NO) || (doing_write!=NO))
902 finish_rw(QCMD_RD_STAT);
903
904 if (get_status((char *) &tperror) != TE_OK) {
905 tpqputs("tp_sense: could not read tape drive status");
906 return TE_ERR;
907 }
908
909 err = tperror.exs; /* get exception status bits */
910 if (err & (TP_ST0|TP_ST1))
911 printk(TPQIC_NAME ": tp_sense: status: %x, error count: %d, underruns: %d\n",
912 tperror.exs, tperror.dec, tperror.urc);
913 else
914 printk(TPQIC_NAME ": tp_sense: no errors at all, soft error count: %d, underruns: %d\n",
915 tperror.dec, tperror.urc);
916
917 /* Set generic status. HP-UX defines these, but some extra would
918 * be useful. Problem is to remain compatible. [Do we want to be
919 * compatible??]
920 */
921 if (err & TP_ST0) {
922 if (err & TP_CNI) /* no cartridge */
923 gs |= GMT_DR_OPEN(-1);
924 if (status_dead == NO)
925 gs |= GMT_ONLINE(-1); /* always online */
926 if (err & TP_USL) /* not online */
927 gs &= ~GMT_ONLINE(-1);
928 if (err & TP_WRP)
929 gs |= GMT_WR_PROT(-1);
930 if (err & TP_EOM) { /* end of media */
931 gs |= GMT_EOT(-1); /* not sure this is correct for writes */
932 status_eom_detected = YES;
933 /* I don't know whether drive always reports EOF at or before EOM. */
934 status_eof_detected = YES;
935 }
936 /** if (err & TP_UDA) "Unrecoverable data error" **/
937 /** if (err & TP_BNL) "Bad block not located" **/
938 if (err & TP_FIL) {
939 gs |= GMT_EOF(-1);
940 status_eof_detected = YES;
941 }
942 }
943 if (err & TP_ST1) {
944 /** if (err & TP_ILL) "Illegal command" **/
945 /** if (err & TP_NDT) "No data detected" **/
946 /** if (err & TP_MBD) "Marginal block detected" **/
947 if (err & TP_BOM)
948 gs |= GMT_BOT(-1); /* beginning of tape */
949 }
950 ioctl_status.mt_gstat = gs;
951 ioctl_status.mt_dsreg = tperror.exs; /* "drive status" */
952 ioctl_status.mt_erreg = tperror.dec; /* "sense key error" */
953
954 if (err!=0) {
955 exnr = decode_exception_nr(err);
956 handle_exception(exnr, err); /* update driver state wrt drive status */
957 report_exception(exnr);
958 }
959 err &= ~ignore; /* mask unwanted errors -- not the correct way, use exception nrs?? */
960 if (((err & TP_ST0) && (err & REPORT_ERR0)) ||
961 ((err & TP_ST1) && (err & REPORT_ERR1)))
962 return TE_ERR;
963 return TE_OK;
964 } /* tp_sense */
965
966
967
968 /* Wait for a wind or rewind operation to finish or
969 * to time-out. (May take very long).
970 */
971 static int wait_for_rewind(time_t timeout)
/* */
972 {
973 int stat;
974
975 stat = inb(QIC_STAT_PORT) & QIC_STAT_MASK;
976 printk(TPQIC_NAME ": Waiting for (re-)wind to finish: stat=0x%x\n", stat);
977
978 stat = wait_for_ready(timeout);
979
980 if (stat != TE_OK) {
981 tpqputs("(re-) winding failed\n");
982 }
983 return stat;
984 } /* wait_for_rewind */
985
986
987
988 /* Perform a full QIC02 command, and wait for completion,
989 * check status when done. Complain about exceptions.
990 *
991 * This function should return an OS error code when
992 * something goes wrong, 0 otherwise.
993 */
994 static int ll_do_qic_cmd(int cmd, time_t timeout)
/* */
995 {
996 int stat;
997
998 if (status_dead) {
999 tpqputs("Drive is dead. Do a `mt reset`.");
1000 return -ENXIO; /* User should do an MTRESET. */
1001 }
1002
1003 stat = wait_for_ready(timeout); /* wait for ready or exception */
1004 if (stat == TE_EX) {
1005 if (tp_sense(TP_WRP|TP_BOM|TP_EOM|TP_FIL)!=TE_OK)
1006 return -EIO;
1007 /* else nothing to worry about, I hope */
1008 stat = TE_OK;
1009 }
1010 if (stat != TE_OK) {
1011 printk(TPQIC_NAME ": ll_do_qic_cmd(%x, %d) failed\n", cmd, timeout);
1012 return -EIO;
1013 }
1014
1015
1016 #if OBSOLETE
1017 /* wait for ready since it may not be active immediately after reading status */
1018 while ((inb_p(QIC_STAT_PORT) & QIC_STAT_READY) != 0);
1019 #endif
1020
1021 stat = send_qic02_cmd(cmd, timeout, 0); /* (checks for exceptions) */
1022
1023 if (cmd==QCMD_RD_FM) {
1024 status_eof_detected = NO;
1025 ioctl_status.mt_fileno++;
1026 /* Should update block count as well, but can't.
1027 * Can do a `read address' for some drives, when MTNOP is done.
1028 */
1029 } else if (cmd==QCMD_WRT_FM) {
1030 status_eof_detected = NO;
1031 ioctl_status.mt_fileno++;
1032 } else if ((cmd==QCMD_REWIND) || (cmd==QCMD_ERASE) || (cmd==QCMD_RETEN)) {
1033 status_eof_detected = NO;
1034 status_eom_detected = NO;
1035 status_eot_detected = NO;
1036 need_rewind = NO;
1037 ioctl_status.mt_fileno = ioctl_status.mt_blkno = 0;
1038 extra_blocks_left = BLOCKS_BEYOND_EW;
1039 return_write_eof = NO;
1040 return_read_eof = NO;
1041 reported_read_eof = NO;
1042 reported_write_eof = NO;
1043 }
1044 /* sense() will set eof/eom as required */
1045 if (stat==TE_EX) {
1046 if (tp_sense(TP_WRP|TP_BOM|TP_EOM|TP_FIL)!=TE_OK) {
1047 printk(TPQIC_NAME ": Exception persist in ll_do_qic_cmd[1](%x, %d)", cmd, timeout);
1048 status_dead = YES;
1049 return -ENXIO;
1050 /* if rdstatus fails too, we're in trouble */
1051 }
1052 }
1053 else if (stat!=TE_OK) {
1054 printk(TPQIC_NAME ": ll_do_qic_cmd: send_qic02_cmd failed, stat = 0x%x\n", stat);
1055 return -EIO; /*** -EIO is probably not always appropriate */
1056 }
1057
1058
1059 if (timeout == TIM_R)
1060 stat = wait_for_rewind(timeout);
1061 else
1062 stat = wait_for_ready(timeout);
1063
1064 if (stat==TE_EX) {
1065 if (tp_sense((cmd==QCMD_SEEK_EOD ? /*****************************/
1066 TP_EOR|TP_NDT|TP_UDA|TP_BNL|TP_WRP|TP_BOM|TP_EOM|TP_FIL :
1067 TP_WRP|TP_BOM|TP_EOM|TP_FIL))!=TE_OK) {
1068 printk(TPQIC_NAME ": Exception persist in ll_do_qic_cmd[2](%x, %d)\n", cmd, timeout);
1069 if (cmd!=QCMD_RD_FM)
1070 status_dead = YES;
1071 return -ENXIO;
1072 /* if rdstatus fails too, we're in trouble */
1073 }
1074 }
1075 else if (stat!=TE_OK) {
1076 printk(TPQIC_NAME ": ll_do_qic_cmd %x: wait failed, stat == 0x%x\n", cmd, stat);
1077 return -EIO;
1078 }
1079 return 0;
1080 } /* ll_do_qic_cmd */
1081
1082
1083 /*
1084 * Problem: What to do when the user cancels a read/write operation
1085 * in-progress?
1086 *
1087 * "Deactivating ONLINE during a READ also causes the"
1088 * "tape to be rewound to BOT." Ditto for WRITEs, except
1089 * a FM is written first. "The host may alternatively terminate
1090 * the READ/WRITE command by issuing a RFM/WFM command."
1091 *
1092 * For READs:
1093 * Neither option will leave the tape positioned where it was.
1094 * Another (better?) solution is to terminate the READ by two
1095 * subsequent sense() operations, the first to stop the current
1096 * READ cycle, the second to clear the `Illegal command' exception,
1097 * because the QIC-02 specs didn't anticipate this. This is
1098 * delayed until actually needed, so a tar listing can be aborted
1099 * by the user and continued later.
1100 * If anybody has a better solution, let me know! [Also, let me
1101 * know if your drive (mine is a Wangtek5150EQ) does not accept
1102 * this sequence for canceling the read-cycle.]
1103 *
1104 * For WRITEs it's simple: Just do a WRITE_FM, leaving the tape
1105 * positioned after the FM.
1106 */
1107
1108 static void terminate_read(int cmd)
/* */
1109 {
1110 if (doing_read == YES) {
1111 doing_read = NO;
1112 if (cmd != QCMD_RD_FM) {
1113 /* if the command is a RFM, there is no need to do this
1114 * because a RFM will legally terminate the read-cycle.
1115 */
1116 tpqputs("terminating pending read-cycle");
1117 if (tp_sense(TP_FIL|TP_EOM|TP_WRP) != TE_OK) {
1118 tpqputs("finish_rw[read1]: ignore the 2 lines above");
1119 if (is_exception()) {
1120 if (tp_sense(TP_ILL|TP_FIL|TP_EOM|TP_WRP) != TE_OK)
1121 tpqputs("finish_rw[read2]: read cycle error");
1122 }
1123 }
1124 }
1125 }
1126 } /* terminate_read */
1127
1128
1129 static void terminate_write(int cmd)
/* */
1130 {
1131 int stat;
1132
1133 if (doing_write == YES) {
1134 doing_write = NO;
1135 /* Finish writing by appending a FileMark at the end. */
1136 if (cmd != QCMD_WRT_FM) {
1137 /* finish off write cycle */
1138 stat = ll_do_qic_cmd(QCMD_WRT_FM, TIM_M);
1139 if (stat != TE_OK)
1140 tpqputs("Couldn't finish write cycle properly");
1141 (void) tp_sense(0);
1142 }
1143 /* If there is an EOF token waiting to be returned to
1144 * the (writing) application, discard it now.
1145 * We could be at EOT, so don't reset return_write_eof.
1146 */
1147 reported_write_eof=YES;
1148 }
1149 } /* terminate_write */
1150
1151
1152 /* terminate read or write cycle because of command `cmd' */
1153 static void finish_rw(int cmd)
/* */
1154 {
1155 if (wait_for_ready(TIM_S) != TE_OK) {
1156 tpqputs("error: drive not ready in finish_rw() !");
1157 return;
1158 }
1159 terminate_read(cmd);
1160 terminate_write(cmd);
1161 } /* finish_rw */
1162
1163
1164 /* Perform a QIC command through ll_do_qic_cmd().
1165 * If necessary, rewind the tape first.
1166 * Return an OS error code if something goes wrong, 0 if all is well.
1167 */
1168 static int do_qic_cmd(int cmd, time_t timeout)
/* */
1169 {
1170 int stat;
1171
1172
1173 finish_rw(cmd);
1174
1175 if (need_rewind) {
1176 tpqputs("Rewinding tape...");
1177 stat = ll_do_qic_cmd(QCMD_REWIND, TIM_R);
1178 if (stat != 0) {
1179 printk(TPQIC_NAME ": rewind failed in do_qic_cmd(). stat=0x%2x", stat);
1180 return stat;
1181 }
1182 need_rewind = NO;
1183 if (cmd==QCMD_REWIND) /* don't wind beyond BOT ;-) */
1184 return 0;
1185 }
1186
1187 return ll_do_qic_cmd(cmd, timeout);
1188 } /* do_qic_cmd */
1189
1190
1191 /* Not all ioctls are supported for all drives. Some rely on
1192 * optional QIC-02 commands. Check tpqic02.h for configuration.
1193 * Some of these commands may require ONLINE to be active.
1194 */
1195 static int do_ioctl_cmd(int cmd)
/* */
1196 {
1197 int stat;
1198
1199 /* It is not permitted to read or wind the tape after bytes have
1200 * been written. It is not permitted to write the tape while in
1201 * read mode.
1202 * We try to be kind and allow reading again after writing a FM...
1203 */
1204
1205 switch (cmd) {
1206 case MTRESET:
1207 /* reset verbose */
1208 return (tape_reset(1)==TE_OK)? 0 : -EIO;
1209
1210 case MTFSF:
1211 tpqputs("MTFSF forward searching filemark");
1212 if ((mode_access==WRITE) && status_bytes_wr)
1213 return -EACCES;
1214 return do_qic_cmd(QCMD_RD_FM, TIM_F);
1215
1216 case MTBSF:
1217 #ifdef TP_HAVE_BSF
1218 tpqputs("MTBSF backward searching filemark -- optional command");
1219 if ((mode_access==WRITE) && status_bytes_wr)
1220 return -EACCES;
1221 stat = do_qic_cmd(QCMD_RD_FM_BCK, TIM_F);
1222 #else
1223 tpqputs("MTBSF not supported");
1224 stat = -ENXIO;
1225 #endif
1226 status_eom_detected = status_eof_detected = NO;
1227 return stat;
1228
1229 case MTFSR:
1230 #ifdef TP_HAVE_FSR /* This is an optional QIC-02 command */
1231 tpqputs("MTFSR forward space record");
1232 if ((mode_access==WRITE) && status_bytes_wr)
1233 return -EACCES;
1234 stat = do_qic_cmd(QCMD_SPACE_FWD, TIM_F);
1235 #else
1236 /**** fake it by doing a read data block command? ******/
1237 tpqputs("MTFSR not supported");
1238 stat = -ENXIO;
1239 #endif
1240 return stat;
1241
1242 case MTBSR:
1243 #ifdef TP_HAVE_BSR /* This is an optional QIC-02 command */
1244 /* we need this for appending files with GNU tar!! */
1245 tpqputs("MTFSR backward space record");
1246 if ((mode_access==WRITE) && status_bytes_wr)
1247 return -EACCES;
1248 stat = do_qic_cmd(QCMD_SPACE_BCK, TIM_F);
1249 #else
1250 tpqputs("MTBSR not supported");
1251 stat = -ENXIO;
1252 #endif
1253 status_eom_detected = status_eof_detected = NO;
1254 return stat;
1255
1256 case MTWEOF:
1257 tpqputs("MTWEOF write eof mark");
1258 /* Plain GNU mt(1) 2.2 uses read-only mode for writing FM. :-( */
1259 if (mode_access==READ)
1260 return -EACCES;
1261
1262 /* allow tape movement after writing FM */
1263 status_bytes_rd = status_bytes_wr; /* Kludge-O-Matic */
1264 status_bytes_wr = NO;
1265 return do_qic_cmd(QCMD_WRT_FM, TIM_M);
1266 /* not sure what to do with status_bytes when WFM should fail */
1267
1268 case MTREW:
1269 tpqputs("MTREW rewinding tape");
1270 if ((mode_access==WRITE) && status_bytes_wr)
1271 return -EACCES;
1272 status_eom_detected = status_eof_detected = NO;
1273 return do_qic_cmd(QCMD_REWIND, TIM_R);
1274
1275 case MTOFFL:
1276 tpqputs("MTOFFL rewinding & going offline"); /*---*/
1277 /******* What exactly are we supposed to do, to take it offline????
1278 *****/
1279 /* Doing a drive select will clear (unlock) the current drive.
1280 * But that requires support for multiple drives and locking.
1281 */
1282 if ((mode_access==WRITE) && status_bytes_wr)
1283 return -EACCES;
1284 status_eom_detected = status_eof_detected = NO;
1285 /**** do rewind depending on minor bits??? ***/
1286 stat = do_qic_cmd(QCMD_REWIND, TIM_R);
1287 return stat;
1288
1289 case MTNOP:
1290 tpqputs("MTNOP setting status only");
1291 /********** should do `read position' for drives that support it **********/
1292 return (tp_sense(-1)==TE_OK)? 0 : -EIO; /**** check return codes ****/
1293
1294 case MTRETEN:
1295 tpqputs("MTRETEN retension tape");
1296 if ((mode_access==WRITE) && status_bytes_wr)
1297 return -EACCES;
1298 status_eom_detected = status_eof_detected = NO;
1299 return do_qic_cmd(QCMD_RETEN, TIM_R);
1300
1301 case MTBSFM:
1302 /* Think think is like MTBSF, except that
1303 * we shouldn't skip the FM. Tricky.
1304 * Maybe use RD_FM_BCK, then do a SPACE_FWD?
1305 */
1306 tpqputs("MTBSFM not supported");
1307 if ((mode_access==WRITE) && status_bytes_wr)
1308 return -EACCES;
1309 return -ENXIO;
1310
1311 case MTFSFM:
1312 /* I think this is like MTFSF, except that
1313 * we shouldn't skip the FM. Tricky.
1314 * Maybe use QCMD_RD_DATA until we get a TP_FIL exception?
1315 * But then the FM will have been skipped...
1316 * Maybe use RD_FM, then RD_FM_BCK, but not all
1317 * drives will support that!
1318 */
1319 tpqputs("MTFSFM not supported");
1320 if ((mode_access==WRITE) && status_bytes_wr)
1321 return -EACCES;
1322 return -ENXIO;
1323
1324 case MTEOM:
1325 /* This should leave the tape ready for appending
1326 * another file to the end, such that it would append
1327 * after the last FM on tape.
1328 */
1329 tpqputs("MTEOM search for End Of recorded Media");
1330 if ((mode_access==WRITE) && status_bytes_wr)
1331 return -EACCES;
1332 #ifdef TP_HAVE_EOD
1333 /* Use faster seeking when possible.
1334 * This requires the absence of data beyond the EOM.
1335 */
1336 # if TAPE_QIC02_DRIVE == MT_ISWT5150
1337 /* It seems that my drive does not always perform the
1338 * SEEK_EOD correctly, unless it is preceded by a
1339 * rewind command.
1340 */
1341 # if 0
1342 status_eom_detected = status_eof_detected = NO;
1343 # endif
1344 stat = do_qic_cmd(QCMD_REWIND, TIM_R);
1345 if (stat)
1346 return stat;
1347
1348 # endif
1349 stat = do_qic_cmd(QCMD_SEEK_EOD, TIM_F);
1350 /* After a successful seek, TP_EOR should be returned */
1351 #else
1352 /* else just seek until the drive returns exception "No Data" */
1353 stat = 0;
1354 while ((stat==0) && (!status_eom_detected)) {
1355 stat = do_qic_cmd(QCMD_RD_FM, TIM_F); /***** should use MTFSFM here???? ******/
1356 }
1357 if (tperror.exs & TP_NDT)
1358 return 0;
1359 #endif
1360 return stat;
1361
1362 case MTERASE:
1363 tpqputs("MTERASE -- ERASE TAPE !");
1364 if ((tperror.exs & TP_ST0) && (tperror.exs & TP_WRP)) {
1365 tpqputs("Cartridge is write-protected.");
1366 return -EACCES;
1367 } else {
1368 time_t t = jiffies;
1369 /* give user a few seconds to pull out tape */
1370 while (jiffies - t < 3*HZ)
1371 schedule();
1372 }
1373
1374 /* Plain GNU mt(1) 2.2 erases a tape in O_RDONLY. :-( */
1375 if (mode_access==READ)
1376 return -EACCES;
1377
1378 /* don't bother writing filemark */
1379 status_eom_detected = status_eof_detected = NO;
1380 return do_qic_cmd(QCMD_ERASE, TIM_R);
1381
1382
1383 case MTRAS1:
1384 #ifdef TP_HAVE_RAS1
1385 tpqputs("MTRAS1: non-destructive self test");
1386 stat = do_qic_cmd(QCMD_SELF_TST1, TIM_R);
1387 if (stat != 0) {
1388 tpqputs("RAS1 failed");
1389 return stat;
1390 }
1391 return (tp_sense(0)==TE_OK)? 0 : -EIO; /* get_ext_status3(); */
1392 #else
1393 tpqputs("RAS1 not supported");
1394 return -ENXIO;
1395 #endif
1396
1397 case MTRAS2:
1398 #ifdef TP_HAVE_RAS2
1399 tpqputs("MTRAS2: destructive self test");
1400 stat = do_qic_cmd(QCMD_SELF_TST2, TIM_R);
1401 if (stat != 0) {
1402 tpqputs("RAS2 failed");
1403 return stat;
1404 }
1405 return (tp_sense(0)==TE_OK)? 0 : -EIO; /* get_ext_status3(); */
1406 #else
1407 tpqputs("RAS2 not supported");
1408 return -ENXIO;
1409 #endif
1410
1411 #ifdef TP_HAVE_SEEK
1412 case MTSEEK:
1413 tpqputs("MTSEEK seeking block");
1414 if ((mode_access==WRITE) && status_bytes_wr)
1415 return -EACCES;
1416 /* NOTE: address (24 bits) is in seek_addr_buf[] */
1417 return do_qic_cmd(QCMDV_SEEK_BLK, TIM_F);
1418 #endif
1419
1420 default:
1421 return -ENOTTY;
1422 }
1423 } /* do_ioctl_cmd */
1424
1425
1426 /* dma_transfer(): This routine is called for every 512 bytes to be read
1427 * from/written to the tape controller. Speed is important here!
1428 * (There must be enough time left for the hd controller!)
1429 * When other devices use DMA they must ensure they use un-interruptible
1430 * double byte accesses to the DMA controller. Floppy.c is ok.
1431 * Must have interrupts disabled when this function is invoked,
1432 * otherwise, the double-byte transfers to the DMA controller will not
1433 * be atomic. That could lead to nasty problems when they are interrupted
1434 * by other DMA interrupt-routines.
1435 *
1436 * This routine merely does the least possible to keep
1437 * the transfers going:
1438 * - set the DMA count register for the next 512 bytes
1439 * - adjust the DMA address and page registers
1440 * - adjust the timeout
1441 * - tell the tape controller to start transferring
1442 * We assume the dma address and mode are, and remain, valid.
1443 */
1444 static inline void dma_transfer(void)
/* */
1445 {
1446
1447 #if TAPE_QIC02_IFC == WANGTEK
1448 outb_p(WT_CTL_ONLINE, QIC_CTL_PORT); /* back to normal */
1449 #elif TAPE_QIC02_IFC == ARCHIVE
1450 outb_p(0, AR_RESET_DMA_PORT);
1451 #endif
1452
1453 clear_dma_ff(TAPE_QIC02_DMA);
1454 set_dma_mode(TAPE_QIC02_DMA, dma_mode);
1455 set_dma_addr(TAPE_QIC02_DMA, buffaddr+dma_bytes_done); /* full address */
1456 set_dma_count(TAPE_QIC02_DMA, TAPE_BLKSIZE);
1457
1458 /* start tape DMA controller */
1459 #if TAPE_QIC02_IFC == WANGTEK
1460 outb_p(WT_CTL_DMA | WT_CTL_ONLINE, QIC_CTL_PORT); /* trigger DMA transfer */
1461 #elif TAPE_QIC02_IFC == ARCHIVE
1462 outb_p(AR_CTL_IEN | AR_CTL_DNIEN, QIC_CTL_PORT); /* enable interrupts again */
1463 outb_p(0, AR_START_DMA_PORT); /* start DMA transfer */
1464 /* In dma_end() AR_RESET_DMA_PORT is written too. */
1465 #endif
1466
1467 /* start computer DMA controller */
1468 enable_dma(TAPE_QIC02_DMA);
1469 /* block transfer should start now, jumping to the
1470 * interrupt routine when done or an exception was detected.
1471 */
1472 } /* dma_transfer */
1473
1474
1475 /* start_dma() sets a DMA transfer up between the tape controller and
1476 * the kernel tape_qic02_buf buffer.
1477 * Normally bytes_todo==dma_bytes_done at the end of a DMA transfer. If not,
1478 * a filemark was read, or an attempt to write beyond the End Of Tape
1479 * was made. [Or some other bad thing happened.]
1480 * Must do a sense() before returning error.
1481 */
1482 static int start_dma(short mode, unsigned long bytes_todo)
/* */
1483 /* assume 'bytes_todo'>0 */
1484 {
1485 int stat;
1486
1487 TPQPUTS("start_dma() enter");
1488 TPQDEB({printk(TPQIC_NAME ": doing_read==%d, doing_write==%d\n", doing_read, doing_write);})
1489
1490 dma_bytes_done = 0;
1491 dma_bytes_todo = bytes_todo;
1492 status_error = NO;
1493 /* dma_mode!=0 indicates that the dma controller is in use */
1494 dma_mode = (mode == WRITE)? DMA_MODE_WRITE : DMA_MODE_READ;
1495
1496 /* Only give READ/WRITE DATA command to tape drive if we haven't
1497 * done that already. Otherwise the drive will rewind to the beginning
1498 * of the current file on tape. Any QIC command given other than
1499 * R/W FM will break the read/write transfer cycle.
1500 * do_qic_cmd() will terminate doing_{read,write}
1501 */
1502 if ((doing_read == NO) && (doing_write == NO)) {
1503 /* First, we have to clear the status -- maybe remove TP_FIL???
1504 */
1505
1506 #if 0
1507 /* Next dummy get status is to make sure CNI is valid,
1508 since we're only just starting a read/write it doesn't
1509 matter some exceptions are cleared by reading the status;
1510 we're only interested in CNI and WRP. -Eddy */
1511 get_status((char *) &tperror);
1512 #else
1513 /* TP_CNI should now be handled in open(). -Hennus */
1514 #endif
1515
1516 stat = tp_sense(((mode == WRITE)? 0 : TP_WRP) | TP_BOM | TP_FIL);
1517 if (stat != TE_OK)
1518 return stat;
1519
1520 #if OBSOLETE
1521 /************* not needed iff rd_status() would wait for ready!!!!!! **********/
1522 if (wait_for_ready(TIM_S) != TE_OK) { /*** not sure this is needed ***/
1523 tpqputs("wait_for_ready failed in start_dma");
1524 return -EIO;
1525 }
1526 #endif
1527
1528 /* Tell the controller the data direction */
1529
1530 /* r/w, timeout medium, check exceptions, sets status_cmd_pending. */
1531 stat = send_qic02_cmd((mode == WRITE)? QCMD_WRT_DATA : QCMD_RD_DATA, TIM_M, 0);
1532 if (stat!=TE_OK) {
1533 printk(TPQIC_NAME ": start_dma: init %s failed\n",
1534 (mode == WRITE)? "write" : "read");
1535 (void) tp_sense(0);
1536 return stat;
1537 }
1538
1539 /* Do this last, because sense() will clear the doing_{read,write}
1540 * flags, causing trouble next time around.
1541 */
1542 if (wait_for_ready(TIM_M) != TE_OK)
1543 return -EIO;
1544 switch (mode) {
1545 case READ:
1546 doing_read = YES;
1547 break;
1548 case WRITE:
1549 doing_write = YES;
1550 break;
1551 default:
1552 printk(TPQIC_NAME ": requested unknown mode %d\n", mode);
1553 panic(TPQIC_NAME ": invalid mode in start_dma()");
1554 }
1555
1556 } else if (is_exception()) {
1557 /* This is for Archive drives, to handle reads with 0 bytes
1558 * left for the last read request.
1559 *
1560 * ******** this also affects EOF/EOT handling! ************
1561 */
1562 tpqputs("detected exception in start_dma() while transfer in progress");
1563 status_error = YES;
1564 return TE_END;
1565 }
1566
1567
1568 status_expect_int = YES;
1569
1570 /* This assumes tape is already positioned, but these
1571 * semi-'intelligent' drives are unpredictable...
1572 */
1573 TIMERON(TIM_M*2);
1574
1575 /* initiate first data block read from/write to the tape controller */
1576
1577 cli();
1578 dma_transfer();
1579 sti();
1580
1581 TPQPUTS("start_dma() end");
1582 return TE_OK;
1583 } /* start_dma */
1584
1585
1586 /* This cleans up after the dma transfer has completed
1587 * (or failed). If an exception occurred, a sense()
1588 * must be done. If the exception was caused by a FM,
1589 * sense() will set `status_eof_detected' and
1590 * `status_eom_detected', as required.
1591 */
1592 static void end_dma(unsigned long * bytes_done)
/* */
1593 {
1594 int stat = TE_OK;
1595
1596 TIMEROFF;
1597
1598 TPQPUTS("end_dma() enter");
1599
1600 disable_dma(TAPE_QIC02_DMA);
1601 clear_dma_ff(TAPE_QIC02_DMA);
1602
1603 #if TAPE_QIC02_IFC == WANGTEK
1604 outb_p(WT_CTL_ONLINE, QIC_CTL_PORT); /* back to normal */
1605 #elif TAPE_QIC02_IFC == ARCHIVE
1606 outb_p(0, AR_RESET_DMA_PORT);
1607 #endif
1608
1609 stat = wait_for_ready(TIM_M);
1610 if (status_error || (stat!=TE_OK)) {
1611 tpqputs("DMA transfer exception");
1612 stat = tp_sense((dma_mode==READ)? TP_WRP : 0);
1613 /* no return here -- got to clean up first! */
1614 }
1615 /* take the tape controller offline */
1616
1617 /* finish off DMA stuff */
1618
1619
1620 dma_mode = 0;
1621 /* Note: The drive is left on-line, ready for the next
1622 * data transfer.
1623 * If the next command to the drive does not continue
1624 * the pending cycle, it must do 2 sense()s first.
1625 */
1626
1627 *bytes_done = dma_bytes_done;
1628 status_expect_int = NO;
1629 ioctl_status.mt_blkno += (dma_bytes_done / TAPE_BLKSIZE);
1630
1631 TPQPUTS("end_dma() exit");
1632 /*** could return stat here ***/
1633 } /* end_dma */
1634
1635 /*********** Below are the (public) OS-interface procedures ***********/
1636
1637
1638 /* tape_qic02_times_out() is called when a DMA transfer doesn't complete
1639 * quickly enough. Usually this means there is something seriously wrong
1640 * with the hardware/software, but it could just be that the controller
1641 * has decided to do a long rewind, just when I didn't expect it.
1642 * Just try again.
1643 */
1644 static void tape_qic02_times_out(void)
/* */
1645 {
1646 printk("time-out in %s driver\n", TPQIC_NAME);
1647 if ((status_cmd_pending>0) || dma_mode) {
1648 /* takes tooo long, shut it down */
1649 status_dead = YES;
1650 status_cmd_pending = 0;
1651 status_timer_on = NO;
1652 status_expect_int = NO;
1653 status_error = YES;
1654 if (dma_mode) {
1655 dma_mode = 0; /* signal end to read/write routine */
1656 wake_up(&tape_qic02_transfer);
1657 }
1658 }
1659 } /* tape_qic02_times_out */
1660
1661 /*
1662 * Interrupt handling:
1663 *
1664 * 1) Interrupt is generated iff at the end of
1665 * a 512-DMA-block transfer.
1666 * 2) EXCEPTION is not raised unless something
1667 * is wrong or EOT/FM is detected.
1668 * 3) FM EXCEPTION is set *after* the last byte has
1669 * been transferred by DMA. By the time the interrupt
1670 * is handled, the EXCEPTION may already be set.
1671 *
1672 * So,
1673 * 1) On EXCEPTION, assume data has been transferred, so
1674 * continue as usual, but set a flag to indicate the
1675 * exception was detected.
1676 * Do a sense status when the flag is found set.
1677 * 2) Do not attempt to continue a transfer after an exception.
1678 * [??? What about marginal blocks???????]
1679 */
1680
1681
1682 /* tape_qic02_interrupt() is called when the tape controller completes
1683 * a DMA transfer.
1684 * We are not allowed to sleep here!
1685 *
1686 * Check if the transfer was successful, check if we need to transfer
1687 * more. If the buffer contains enough data/is empty enough, signal the
1688 * read/write() thread to copy to/from user space.
1689 * When we are finished, set flags to indicate end, disable timer.
1690 * NOTE: This *must* be fast!
1691 */
1692 static void tape_qic02_interrupt(int unused)
/* */
1693 {
1694 int stat, r, i;
1695
1696 TIMEROFF;
1697
1698 if (status_expect_int) {
1699 if (TP_DIAGS(current_tape_dev))
1700 printk("@");
1701
1702 stat = inb(QIC_STAT_PORT); /* Knock, knock */
1703 #if TAPE_QIC02_IFC == ARCHIVE /* "Who's there?" */
1704 if (((stat & (AR_STAT_DMADONE)) == 0) &&
1705 ((stat & (QIC_STAT_EXCEPTION)) != 0)) {
1706 TIMERCONT;
1707 return; /* "Linux with IRQ sharing" */
1708 }
1709 #endif
1710 if ((stat & QIC_STAT_EXCEPTION) == 0) { /* exception occurred */
1711 /* Possible causes for an exception during a transfer:
1712 * - during a write-cycle: end of tape (EW) hole detected.
1713 * - during a read-cycle: filemark or EOD detected.
1714 * - something went wrong
1715 * So don't continue with the next block.
1716 */
1717 tpqputs("isr: exception on tape controller");
1718 printk(" status %02x\n", stat);
1719 status_error = TE_EX;
1720
1721 dma_bytes_done += TAPE_BLKSIZE;
1722
1723 dma_mode = 0; /* wake up rw() */
1724 status_expect_int = NO;
1725 wake_up(&tape_qic02_transfer);
1726 return;
1727 }
1728 /* return if tape controller not ready, or
1729 * if dma channel hasn't finished last byte yet.
1730 */
1731 r = 0;
1732 /* Skip next ready check for Archive controller because
1733 * it may be busy reading ahead. Weird. --hhb
1734 */
1735 #if TAPE_QIC02_IFC != ARCHIVE /* I think this is a drive-dependency, not IFC -- hhb */
1736 if (stat & QIC_STAT_READY) { /* not ready */
1737 tpqputs("isr: ? Tape controller not ready");
1738 r = 1;
1739 }
1740 #endif
1741
1742 if ( (i = get_dma_residue(TAPE_QIC02_DMA)) != 0 ) {
1743 printk(TPQIC_NAME ": dma_residue == %x !!!\n", i);
1744 r = 1; /* big trouble, but can't do much about it... */
1745 }
1746
1747 if (r)
1748 return;
1749
1750 /* finish DMA cycle */
1751
1752 /* no errors detected, continue */
1753 dma_bytes_done += TAPE_BLKSIZE;
1754 if (dma_bytes_done >= dma_bytes_todo) {
1755 /* finished! Wakeup rw() */
1756 dma_mode = 0;
1757 status_expect_int = NO;
1758 TPQPUTS("isr: dma_bytes_done");
1759 wake_up(&tape_qic02_transfer);
1760 } else {
1761 /* start next transfer, account for track-switching time */
1762 timer_table[TAPE_QIC02_TIMER].expires = jiffies + 6*HZ;
1763 dma_transfer();
1764 }
1765 } else {
1766 printk(TPQIC_NAME ": Unexpected interrupt, stat == %x\n",
1767 inb(QIC_STAT_PORT));
1768 }
1769 } /* tape_qic02_interrupt */
1770
1771
1772 static int tape_qic02_lseek(struct inode * inode, struct file * file, off_t offset, int origin)
/* */
1773 {
1774 return -EINVAL; /* not supported */
1775 } /* tape_qic02_lseek */
1776
1777
1778 /* read/write routines:
1779 * This code copies between a kernel buffer and a user buffer. The
1780 * actual data transfer is done using DMA and interrupts. Time-outs
1781 * are also used.
1782 *
1783 * When a filemark is read, we return '0 bytes read' and continue with the
1784 * next file after that.
1785 * When EOM is read, we return '0 bytes read' twice.
1786 * When the EOT marker is detected on writes, '0 bytes read' should be
1787 * returned twice. If user program does a MTNOP after that, 2 additional
1788 * blocks may be written. ------- FIXME: Implement this correctly *************************************************
1789 *
1790 * Only read/writes in multiples of 512 bytes are accepted.
1791 * When no bytes are available, we sleep() until they are. The controller will
1792 * generate an interrupt, and we (should) get a wake_up() call.
1793 *
1794 * Simple buffering is used. User program should ensure that a large enough
1795 * buffer is used. Usually the drive does some buffering as well (something
1796 * like 4k or so).
1797 *
1798 * Scott S. Bertilson suggested to continue filling the user buffer, rather
1799 * than waste time on a context switch, when the kernel buffer fills up.
1800 */
1801
1802 /*
1803 * Problem: tar(1) doesn't always read the entire file. Sometimes the entire file
1804 * has been read, but the EOF token is never returned to tar(1), simply because
1805 * tar(1) knows it has already read all of the data it needs. So we must use
1806 * open/release to reset the `reported_read_eof' flag. If we don't, the next read
1807 * request would return the EOF flag for the previous file.
1808 */
1809
1810 static int tape_qic02_read(struct inode * inode, struct file * filp, char * buf, int count)
/* */
1811 {
1812 int error;
1813 dev_t dev = inode->i_rdev;
1814 unsigned short flags = filp->f_flags;
1815 unsigned long bytes_todo, bytes_done, total_bytes_done = 0;
1816 int stat;
1817
1818 if (TP_DIAGS(current_tape_dev))
1819 printk(TPQIC_NAME ": request READ, minor=%x, buf=%p, count=%x, pos=%x, flags=%x\n",
1820 MINOR(dev), buf, count, filp->f_pos, flags);
1821
1822 if (count % TAPE_BLKSIZE) { /* Only allow mod 512 bytes at a time. */
1823 tpqputs("Wrong block size");
1824 return -EINVAL;
1825 }
1826
1827 /* Just assume everything is ok. Controller will scream if not. */
1828
1829 if (status_bytes_wr) /* Once written, no more reads, 'till after WFM. */
1830 return -EACCES;
1831
1832
1833 /* Make sure buffer is safe to write into. */
1834 error = verify_area(VERIFY_WRITE, buf, count);
1835 if (error) {
1836 printk(TPQIC_NAME ": read: verify_area(WRITE, %p, %x) failed\n", buf, count);
1837 return error;
1838 }
1839
1840 /* This is rather ugly because it has to implement a finite state
1841 * machine in order to handle the EOF situations properly.
1842 */
1843 while (count>=0) {
1844 bytes_done = 0;
1845 /* see how much fits in the kernel buffer */
1846 bytes_todo = TPQBUF_SIZE;
1847 if (bytes_todo>count)
1848 bytes_todo = count;
1849
1850 /* Must ensure that user program sees exactly one EOF token (==0) */
1851 if (return_read_eof==YES) {
1852 printk("read: return_read_eof==%d, reported_read_eof==%d, total_bytes_done==%d\n", return_read_eof, reported_read_eof, total_bytes_done);
1853
1854 if (reported_read_eof==NO) {
1855 /* have not yet returned EOF to user program */
1856 if (total_bytes_done>0) {
1857 return total_bytes_done; /* next time return EOF */
1858 } else {
1859 reported_read_eof = YES; /* move on next time */
1860 return 0; /* return EOF */
1861 }
1862 } else {
1863 /* Application program has already received EOF
1864 * (above), now continue with next file on tape,
1865 * if possible.
1866 * When the FM is reached, EXCEPTION is set,
1867 * causing a sense(). Subsequent read/writes will
1868 * continue after the FM.
1869 */
1870 /*********** ?????????? this should check for (EOD|NDT), not EOM, 'cause we can read past EW: ************/
1871 if (status_eom_detected)
1872 /* If EOM, nothing left to read, so keep returning EOFs.
1873 *** should probably set some flag to avoid clearing
1874 *** status_eom_detected through ioctls or something
1875 */
1876 return 0;
1877 else {
1878 /* just eof, there may be more files ahead... */
1879 return_read_eof = NO;
1880 reported_read_eof = NO;
1881 status_eof_detected = NO; /* reset this too */
1882 /*fall through*/
1883 }
1884 }
1885 }
1886
1887 /*****************************/
1888 if (bytes_todo==0)
1889 return total_bytes_done;
1890
1891 if (bytes_todo>0) {
1892 /* start reading data */
1893 if (is_exception()) /****************************************/
1894 tpqputs("is_exception() before start_dma()!");
1895 /******************************************************************
1896 ***** if start_dma() fails because the head is positioned 0 bytes
1897 ***** before the FM, (causing EXCEPTION to be set) return_read_eof should
1898 ***** be set to YES, and we should return total_bytes_done, rather than -ENXIO.
1899 ***** The app should recognize this as an EOF condition.
1900 ***************************************************************************/
1901 stat = start_dma(READ, bytes_todo);
1902 if (stat == TE_OK) {
1903 /* Wait for transfer to complete, interrupt should wake us */
1904 while (dma_mode != 0) {
1905 sleep_on(&tape_qic02_transfer);
1906 }
1907 if (status_error)
1908 return_read_eof = YES;
1909 } else if (stat != TE_END) {
1910 /* should do sense() on error here */
1911 #if 0
1912 return -ENXIO;
1913 #else
1914 printk("Trouble: stat==%02x\n", stat);
1915 return_read_eof = YES;
1916 /*************** check EOF/EOT handling!!!!!! **/
1917 #endif
1918 }
1919 end_dma(&bytes_done);
1920 if (bytes_done>bytes_todo) {
1921 tpqputs("read: Oops, read more bytes than requested");
1922 return -EIO;
1923 }
1924 /* copy buffer to user-space in one go */
1925 if (bytes_done>0)
1926 memcpy_tofs( (void *) buf, (void *) buffaddr, bytes_done);
1927 #if 1
1928 /* Checks Ton's patch below */
1929 if ((return_read_eof == NO) && (status_eof_detected == YES)) {
1930 printk(TPQIC_NAME ": read(): return_read_eof=%d, status_eof_detected=YES. return_read_eof:=YES\n", return_read_eof);
1931 }
1932 #endif
1933 if ((bytes_todo != bytes_done) || (status_eof_detected == YES))
1934 /* EOF or EOM detected. return EOF next time. */
1935 return_read_eof = YES;
1936 } /* else: ignore read request for 0 bytes */
1937
1938 if (bytes_done>0) {
1939 status_bytes_rd = YES;
1940 buf += bytes_done;
1941 filp->f_pos += bytes_done;
1942 total_bytes_done += bytes_done;
1943 count -= bytes_done;
1944 }
1945 }
1946 tpqputs("read request for <0 bytes");
1947 return -EINVAL;
1948 } /* tape_qic02_read */
1949
1950
1951
1952 /* The drive detects near-EOT by means of the holes in the tape.
1953 * When the holes are detected, there is some space left. The drive
1954 * reports this as a TP_EOM exception. After clearing the exception,
1955 * the drive should accept two extra blocks.
1956 *
1957 * It seems there are some archiver programs that would like to use the
1958 * extra space for writing a continuation marker. The driver should return
1959 * end-of-file to the user program on writes, when the holes are detected.
1960 * If the user-program wants to use the extra space, it should use the
1961 * MTNOP ioctl() to get the generic status register and may then continue
1962 * writing (max 1kB). ----------- doesn't work yet...............
1963 *
1964 * EOF behaviour on writes:
1965 * If there is enough room, write all of the data.
1966 * If there is insufficient room, write as much as will fit and
1967 * return the amount written. If the requested amount differs from the
1968 * written amount, the application program should recognize that as the
1969 * end of file. Subsequent writes will return -ENOSPC.
1970 * Unless the minor bits specify a rewind-on-close, the tape will not
1971 * be rewound when it is full. The user-program should do that, if desired.
1972 * If the driver were to do that automatically, a user-program could be
1973 * confused about the EOT/BOT condition after re-opening the tape device.
1974 *
1975 * Multiple volume support: Tar closes the tape device before prompting for
1976 * the next tape. The user may then insert a new tape and tar will open the
1977 * tape device again. The driver will detect an exception status in (No Cartridge)
1978 * and force a rewind. After that tar may continue writing.
1979 */
1980 static int tape_qic02_write(struct inode * inode, struct file * filp, char * buf, int count)
/* */
1981 {
1982 int error;
1983 dev_t dev = inode->i_rdev;
1984 unsigned short flags = filp->f_flags;
1985 unsigned long bytes_todo, bytes_done, total_bytes_done = 0;
1986
1987 if (TP_DIAGS(current_tape_dev))
1988 printk(TPQIC_NAME ": request WRITE, minor=%x, buf=%p, count=%x, pos=%x, flags=%x\n",
1989 MINOR(dev), buf, count, filp->f_pos, flags);
1990
1991 if (count % TAPE_BLKSIZE) { /* only allow mod 512 bytes at a time */
1992 tpqputs("Wrong block size");
1993 return -EINVAL;
1994 }
1995
1996 if (mode_access==READ) {
1997 tpqputs("Not in write mode");
1998 return -EACCES;
1999 }
2000
2001 /* open() does a sense() and we can assume the tape isn't changed
2002 * between open() and release(), so the tperror.exs bits will still
2003 * be valid.
2004 */
2005 if ((tperror.exs & TP_ST0) && (tperror.exs & TP_WRP)) {
2006 tpqputs("Cartridge is write-protected.");
2007 return -EACCES; /* don't even try when write protected */
2008 }
2009
2010 /* Make sure buffer is safe to read from. */
2011 error = verify_area(VERIFY_READ, buf, count);
2012 if (error) {
2013 printk(TPQIC_NAME ": write: verify_area(READ, %p, %x) failed\n", buf, count);
2014 return error;
2015 }
2016
2017 if (doing_read == YES)
2018 terminate_read(0);
2019
2020 while (count>=0) {
2021 /* see how much fits in the kernel buffer */
2022 bytes_done = 0;
2023 bytes_todo = TPQBUF_SIZE;
2024 if (bytes_todo>count)
2025 bytes_todo = count;
2026
2027 if (return_write_eof == YES) {
2028 /* return_write_eof should be reset on reverse tape movements. */
2029
2030 if (reported_write_eof==NO) {
2031 if (bytes_todo>0) {
2032 tpqputs("partial write");
2033 /* partial write signals EOF to user program */
2034 }
2035 reported_write_eof = YES;
2036 return total_bytes_done;
2037 } else {
2038 return -ENOSPC; /* return error */
2039 }
2040 }
2041
2042 /* Quit when done. */
2043 if (bytes_todo==0)
2044 return total_bytes_done;
2045
2046
2047 /* copy from user to DMA buffer and initiate transfer. */
2048 if (bytes_todo>0) {
2049 memcpy_fromfs( (void *) buffaddr, (void *) buf, bytes_todo);
2050
2051 /****************** similar problem with read() at FM could happen here at EOT.
2052 ******************/
2053
2054 /***** if at EOT, 0 bytes can be written. start_dma() will
2055 ***** fail and write() will return ENXIO error
2056 *****/
2057 if (start_dma(WRITE, bytes_todo) != TE_OK) {
2058 tpqputs("write: start_dma() failed");
2059 /* should do sense() on error here */
2060 return -ENXIO; /*********** FIXTHIS **************/
2061 }
2062
2063 /* Wait for write to complete, interrupt should wake us. */
2064 while ((status_error == 0) && (dma_mode != 0)) {
2065 sleep_on(&tape_qic02_transfer);
2066 }
2067
2068 end_dma(&bytes_done);
2069 if (bytes_done>bytes_todo) {
2070 tpqputs("write: Oops, wrote more bytes than requested");
2071 return -EIO;
2072 }
2073 /* If the dma-transfer was aborted because of an exception,
2074 * status_error will have been set in the interrupt handler.
2075 * Then end_dma() will do a sense().
2076 * If the exception was EXC_EOM, the EW-hole was encountered
2077 * and two more blocks could be written. For the time being we'll
2078 * just consider this to be the EOT.
2079 * Otherwise, something Bad happened, such as the maximum number
2080 * of block-rewrites was exceeded. [e.g. A very bad spot on tape was
2081 * encountered. Normally short dropouts are compensated for by
2082 * rewriting the block in error, up to 16 times. I'm not sure
2083 * QIC-24 drives can do this.]
2084 */
2085 if (status_error) {
2086 if (status_eom_detected == YES) {
2087 tpqputs("write: EW detected");
2088 return_write_eof = YES;
2089 } else {
2090 /* probably EXC_RWA */
2091 tpqputs("write: dma: error in writing");
2092 return -EIO;
2093 }
2094 }
2095 if (bytes_todo != bytes_done)
2096 /* EOF or EOM detected. return EOT next time. */
2097 return_write_eof = YES;
2098 }
2099 /* else: ignore write request for 0 bytes. */
2100
2101 if (bytes_done>0) {
2102 status_bytes_wr = YES;
2103 buf += bytes_done;
2104 filp->f_pos += bytes_done;
2105 total_bytes_done += bytes_done;
2106 count -= bytes_done;
2107 }
2108 }
2109 tpqputs("write request for <0 bytes");
2110 printk(TPQIC_NAME ": status_bytes_wr %x, buf %p, total_bytes_done %x, count %x\n", status_bytes_wr, buf, total_bytes_done, count);
2111 return -EINVAL;
2112 } /* tape_qic02_write */
2113
2114
2115
2116 /* tape_qic02_open()
2117 * We allow the device to be opened, even if it is marked 'dead' because
2118 * we want to be able to reset the tape device without rebooting.
2119 * Only one open tape file at a time, except when minor=255.
2120 * Minor 255 is only allowed for resetting and always returns <0.
2121 *
2122 * The density command is only allowed when TP_BOM is set. Thus, remember
2123 * the most recently used minor bits. When they are different from the
2124 * remembered values, rewind the tape and set the required density.
2125 * Don't rewind if the minor bits specify density 0.
2126 */
2127 static int tape_qic02_open(struct inode * inode, struct file * filp)
/* */
2128 {
2129 dev_t dev = inode->i_rdev;
2130 unsigned short flags = filp->f_flags;
2131 unsigned short dens;
2132 int s;
2133
2134 status_open = NO;
2135
2136 if (TP_DIAGS(dev)) {
2137 printk("tape_qic02_open: dev=%x, flags=%x ", dev, flags);
2138 }
2139
2140 if (MINOR(dev)==255) /* special case for resetting */
2141 if (suser())
2142 return (tape_reset(1)==TE_OK) ? -EAGAIN : -ENXIO;
2143 else
2144 return -EPERM;
2145
2146 if (status_open==YES) {
2147 return -EBUSY; /* only one at a time... */
2148 }
2149 status_open = YES;
2150
2151 status_bytes_rd = NO;
2152 status_bytes_wr = NO;
2153
2154 return_read_eof = NO; /********????????????????*****/
2155 return_write_eof = (status_eot_detected)? YES : NO;
2156
2157 /* Clear this in case user app close()d before reading EOF token */
2158 status_eof_detected = NO;
2159
2160 reported_read_eof = NO;
2161 reported_write_eof = NO;
2162
2163
2164 switch (flags & O_ACCMODE) {
2165 case O_RDONLY:
2166 mode_access = READ;
2167 break;
2168 case O_WRONLY: /* Fallthru... Strictly speaking this is not correct... */
2169 case O_RDWR: /* reads are allowed as long as nothing is written */
2170 mode_access = WRITE;
2171 break;
2172 }
2173
2174
2175 /* This is to avoid tape-changed problems (TP_CNI exception). */
2176 if (is_exception()) {
2177 s = tp_sense(TP_WRP|TP_EOM|TP_BOM|TP_CNI|TP_EOR);
2178 if (s != TE_OK) {
2179 status_open = NO;
2180 tpqputs("open: sense() failed after exception was detected");
2181 return -EIO;
2182 }
2183 }
2184
2185
2186 /* not allowed to do QCMD_DENS_* unless tape is rewound */
2187 if ((TP_DENS(dev)!=0) && (TP_DENS(current_tape_dev) != TP_DENS(dev))) {
2188 /* force rewind if minor bits have changed,
2189 * i.e. user wants to use tape in different format.
2190 * [assuming single drive operation]
2191 */
2192 tpqputs("Density minor bits have changed. Forcing rewind.");
2193 need_rewind = YES;
2194 } else {
2195 /* density bits still the same, but TP_DIAGS bit
2196 * may have changed.
2197 */
2198 current_tape_dev = dev;
2199 }
2200
2201 if (need_rewind == YES) {
2202 s = do_qic_cmd(QCMD_REWIND, TIM_R);
2203 if (s != 0) {
2204 tpqputs("open: rewind failed");
2205 status_open = NO;
2206 return -EIO;
2207 }
2208 }
2209
2210
2211 /* Note: After a reset command, the controller will rewind the tape
2212 * just before performing any tape movement operation!
2213 */
2214 if (status_dead) {
2215 tpqputs("open: tape dead, attempting reset");
2216 if (tape_reset(1)!=TE_OK) {
2217 status_open = NO;
2218 return -ENXIO;
2219 } else {
2220 status_dead = NO;
2221 if (tp_sense(~(TP_ST1|TP_ILL)) != TE_OK) {
2222 tpqputs("open: tp_sense() failed\n");
2223 status_dead = YES; /* try reset next time */
2224 status_open = NO;
2225 return -EIO;
2226 }
2227 }
2228 }
2229
2230 /* things should be ok, once we get here */
2231
2232
2233 /* set density: only allowed when TP_BOM status bit is set,
2234 * so we must have done a rewind by now. If not, just skip over.
2235 * Only give set density command when minor bits have changed.
2236 */
2237 if (TP_DENS(current_tape_dev) == TP_DENS(dev) )
2238 return 0;
2239
2240 current_tape_dev = dev;
2241 need_rewind = NO;
2242 dens = TP_DENS(dev);
2243 if (dens < sizeof(format_names)/sizeof(char *))
2244 printk(TPQIC_NAME ": format: %s%s\n", (dens!=0)? "QIC-" : "", format_names[dens]);
2245 else
2246 tpqputs("Wait for retensioning...");
2247
2248 switch (TP_DENS(dev)) {
2249 case 0: /* This one's for Eddy ;-) */
2250 s = 0;
2251 break;
2252 case 1:
2253 s = do_qic_cmd(QCMD_DENS_11, TIM_S);
2254 break;
2255 case 2:
2256 s = do_qic_cmd(QCMD_DENS_24, TIM_S);
2257 break;
2258 case 3:
2259 s = do_qic_cmd(QCMD_DENS_120, TIM_S);
2260 break;
2261 case 4:
2262 s = do_qic_cmd(QCMD_DENS_150, TIM_S);
2263 break;
2264 case 5:
2265 s = do_qic_cmd(QCMD_DENS_300, TIM_S);
2266 break;
2267 case 6:
2268 s = do_qic_cmd(QCMD_DENS_600, TIM_S);
2269 break;
2270 default: /* otherwise do a retension before anything else */
2271 s = do_qic_cmd(QCMD_RETEN, TIM_R);
2272 }
2273 if (s != 0) {
2274 status_open = NO; /* fail if fault occurred */
2275 status_dead = YES; /* force reset */
2276 current_tape_dev = 0xff80;
2277 return -EIO;
2278 }
2279
2280 return 0;
2281 } /* tape_qic02_open */
2282
2283
2284 static int tape_qic02_readdir(struct inode * inode, struct file * filp, struct dirent * dp, int count)
/* */
2285 {
2286 return -ENOTDIR; /* not supported */
2287 } /* tape_qic02_readdir */
2288
2289
2290 static void tape_qic02_release(struct inode * inode, struct file * filp)
/* */
2291 {
2292 dev_t dev = inode->i_rdev;
2293
2294 if (TP_DIAGS(dev))
2295 printk("tape_qic02_release: dev=%x\n", dev);
2296
2297 /* Terminate any pending write cycle. Terminating the read-cycle
2298 * is delayed until it is required to do so for a new command.
2299 */
2300 terminate_write(-1);
2301
2302 if (status_dead==YES)
2303 tpqputs("release: device dead!?");
2304
2305 if (status_open==NO) {
2306 tpqputs("release: device not open");
2307 return;
2308 }
2309 /* Rewind only if minor number requires it AND
2310 * read/writes have been done.
2311 */
2312 if ((TP_REWCLOSE(dev)) && (status_bytes_rd | status_bytes_wr)) {
2313 tpqputs("release: Doing rewind...");
2314 (void) do_qic_cmd(QCMD_REWIND, TIM_R);
2315 }
2316
2317 status_open = NO;
2318 return;
2319 } /* tape_qic02_release */
2320
2321
2322
2323 /* ioctl allows user programs to rewind the tape and stuff like that */
2324 static int tape_qic02_ioctl(struct inode * inode, struct file * filp,
/* */
2325 unsigned int iocmd, unsigned long ioarg)
2326 {
2327 int error;
2328 short i;
2329 int dev_maj = MAJOR(inode->i_rdev);
2330 int c;
2331 struct mtop operation;
2332 char *stp, *argp;
2333
2334 #ifdef TP_HAVE_TELL
2335 unsigned char blk_addr[6];
2336 struct mtpos ioctl_tell;
2337 #endif
2338
2339 if (TP_DIAGS(current_tape_dev))
2340 printk(TPQIC_NAME ": ioctl(%4x, %4x, %4x)\n", dev_maj, iocmd, ioarg);
2341
2342 if (!inode || !ioarg)
2343 return -EINVAL;
2344
2345 /* check iocmd first */
2346
2347 if (dev_maj != QIC02_TAPE_MAJOR) {
2348 printk(TPQIC_NAME ": Oops! Wrong device?\n");
2349 /* A panic() would be appropriate here */
2350 return -ENODEV;
2351 }
2352
2353 c = iocmd & IOCCMD_MASK;
2354 if (c == (MTIOCTOP & IOCCMD_MASK)) {
2355
2356 /* Compare expected struct size and actual struct size. This
2357 * is useful to catch programs compiled with old #includes.
2358 */
2359 if (((iocmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT) != sizeof(struct mtop)) {
2360 tpqputs("sizeof(struct mtop) does not match!");
2361 return -EFAULT;
2362 }
2363 error = verify_area(VERIFY_READ, (char *) ioarg, sizeof(operation));
2364 if (error)
2365 return error;
2366
2367 /* copy mtop struct from user space to kernel space */
2368 stp = (char *) &operation;
2369 argp = (char *) ioarg;
2370 for (i=0; i<sizeof(operation); i++)
2371 *stp++ = get_fs_byte(argp++);
2372
2373 /* ---note: mt_count is signed, negative seeks must be
2374 * --- translated to seeks in opposite direction!
2375 * (only needed for Sun-programs, I think.)
2376 */
2377 /* ---note: MTFSF with count 0 should position the
2378 * --- tape at the beginning of the current file.
2379 */
2380
2381 if (TP_DIAGS(current_tape_dev))
2382 printk("OP op=%4x, count=%4x\n", operation.mt_op, operation.mt_count);
2383
2384 if (operation.mt_count < 0)
2385 tpqputs("Warning: negative mt_count ignored");
2386
2387 ioctl_status.mt_resid = operation.mt_count;
2388 if (operation.mt_op == MTSEEK) {
2389 seek_addr_buf[0] = (operation.mt_count>>16)&0xff;
2390 seek_addr_buf[1] = (operation.mt_count>>8)&0xff;
2391 seek_addr_buf[2] = (operation.mt_count)&0xff;
2392 if (operation.mt_count>>24)
2393 return -EINVAL;
2394
2395 if ((error = do_ioctl_cmd(operation.mt_op)) != 0)
2396 return error;
2397 ioctl_status.mt_resid = 0;
2398 } else {
2399 while (operation.mt_count > 0) {
2400 operation.mt_count--;
2401 if ((error = do_ioctl_cmd(operation.mt_op)) != 0)
2402 return error;
2403 ioctl_status.mt_resid = operation.mt_count;
2404 }
2405 }
2406 return 0;
2407
2408 } else if (c == (MTIOCGET & IOCCMD_MASK)) {
2409 if (TP_DIAGS(current_tape_dev))
2410 printk("GET ");
2411
2412 /* compare expected struct size and actual struct size */
2413 if (((iocmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT) != sizeof(struct mtget)) {
2414 tpqputs("sizeof(struct mtget) does not match!");
2415 return -EFAULT;
2416 }
2417
2418 /* check for valid user address */
2419 error = verify_area(VERIFY_WRITE, (void *) ioarg, sizeof(ioctl_status));
2420 if (error)
2421 return error;
2422
2423 /* It appears (gmt(1)) that it is normal behaviour to
2424 * first set the status with MTNOP, and then to read
2425 * it out with MTIOCGET
2426 */
2427
2428 /* copy results to user space */
2429 stp = (char *) &ioctl_status;
2430 argp = (char *) ioarg;
2431 for (i=0; i<sizeof(ioctl_status); i++)
2432 put_fs_byte(*stp++, argp++);
2433 return 0;
2434
2435 #ifdef TP_HAVE_TELL
2436 } else if (c == (MTIOCPOS & IOCCMD_MASK)) {
2437 if (TP_DIAGS(current_tape_dev))
2438 printk("POS ");
2439
2440 /* compare expected struct size and actual struct size */
2441 if (((iocmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT) != sizeof(struct mtpos)) {
2442 tpqputs("sizeof(struct mtpos) does not match!");
2443 return -EFAULT;
2444 }
2445
2446 /* check for valid user address */
2447 error = verify_area(VERIFY_WRITE, (void *) ioarg, sizeof(ioctl_tell));
2448 if (error)
2449 return error;
2450
2451 tpqputs("MTTELL reading block address");
2452 if ((doing_read==YES) || (doing_write==YES))
2453 finish_rw(QCMDV_TELL_BLK);
2454
2455 c = rdstatus((char *) blk_addr, sizeof(blk_addr), QCMDV_TELL_BLK);
2456 if (c!=TE_OK)
2457 return -EIO;
2458
2459 ioctl_tell.mt_blkno = (blk_addr[3] << 16) | (blk_addr[4] << 8) | blk_addr[5];
2460
2461 /* copy results to user space */
2462 stp = (char *) &ioctl_tell;
2463 argp = (char *) ioarg;
2464 for (i=0; i<sizeof(ioctl_tell); i++)
2465 put_fs_byte(*stp++, argp++);
2466 return 0;
2467 #endif
2468 } else
2469 return -ENOTTY; /* Other cmds not supported. */
2470 } /* tape_qic02_ioctl */
2471
2472
2473
2474 /* These are (most) of the interface functions: */
2475 static struct file_operations tape_qic02_fops = {
2476 tape_qic02_lseek, /* not allowed */
2477 tape_qic02_read, /* read */
2478 tape_qic02_write, /* write */
2479 tape_qic02_readdir, /* not allowed */
2480 NULL, /* select ??? */
2481 tape_qic02_ioctl, /* ioctl */
2482 NULL, /* mmap not allowed */
2483 tape_qic02_open, /* open */
2484 tape_qic02_release, /* release */
2485 NULL /* fsync */
2486 };
2487
2488
2489 /* Attribute `SA_INTERRUPT' makes the interrupt atomic with
2490 * interrupts disabled. We could do without the atomic stuff, but
2491 * then dma_transfer() would have to disable interrupts explicitly.
2492 * System load is high enough as it is :-(
2493 */
2494 static struct sigaction tape_qic02_sigaction = {
2495 tape_qic02_interrupt,
2496 0,
2497 SA_INTERRUPT,
2498 NULL
2499 };
2500
2501
2502 /* align `a' at `size' bytes. `size' must be a power of 2 */
2503 static inline unsigned long const align_buffer(unsigned long a, unsigned size)
/* */
2504 {
2505 if (a & (size-1)) /* if not aligned */
2506 return (a | (size-1)) + 1;
2507 else /* else is aligned */
2508 return a;
2509 }
2510
2511
2512 /* init() is called from chr_dev_init() in kernel/chr_drv/mem.c */
2513 long tape_qic02_init(long kmem_start)
/* ![[last]](../icons/n_last.png)
*/
2514 /* Shouldn't this be a caddr_t ? */
2515 {
2516
2517 printk(TPQIC_NAME ": IRQ %d, DMA %d, IO %xh, IFC %s, %s, %s\n",
2518 TAPE_QIC02_IRQ, TAPE_QIC02_DMA, TAPE_QIC02_PORT,
2519 #if TAPE_QIC02_IFC == WANGTEK
2520 "Wangtek",
2521 #elif TAPE_QIC02_IFC == ARCHIVE
2522 "Archive",
2523 #else
2524 # error
2525 #endif
2526 rcs_revision, rcs_date);
2527
2528 /* First perform some checks. If one of them fails,
2529 * the tape driver will not be registered to the system.
2530 */
2531
2532 /* Should do IRQ/DMA allocation in open(). Use free_irq() in release()
2533 * return -EBUSY, if allocation fails in open().
2534 * Make IRQ settable/readable through ioctls. DMA is trickier because
2535 * some bits change for different DMA numbers. Also, this would add
2536 * runtime overhead for having the dma channel number be a variable
2537 * rather than a constant. Probably need to make the DMA stuff #ifdef'd
2538 * to choose between hardcoded and changeable DMA channel.
2539 *
2540 * Also, Linux needs a more generic way to set DMA/IRQ and other stuff.
2541 * Right now, this is done differently for every device. (setserial,
2542 * ctrlaltdel, setdfprm, setfdthr, tunelp, ((setterm))...)
2543 *
2544 * #include <hint.h>
2545 */
2546
2547 /* get IRQ */
2548 if (irqaction(TAPE_QIC02_IRQ, &tape_qic02_sigaction)) {
2549 printk(TPQIC_NAME ": can't allocate IRQ%d for QIC-02 tape\n",
2550 TAPE_QIC02_IRQ);
2551 return kmem_start;
2552 }
2553
2554 /* After IRQ, allocate DMA channel */
2555 if (request_dma(TAPE_QIC02_DMA)) {
2556 printk(TPQIC_NAME ": can't allocate DMA%d for QIC-02 tape\n",
2557 TAPE_QIC02_DMA);
2558 free_irq(TAPE_QIC02_IRQ);
2559 return kmem_start;
2560 }
2561
2562 if (TPSTATSIZE != 6) {
2563 printk(TPQIC_NAME ": internal error: tpstatus struct incorrect!\n");
2564 return kmem_start;
2565 }
2566 if ((TPQBUF_SIZE<512) || (TPQBUF_SIZE>=0x10000)) {
2567 printk(TPQIC_NAME ": internal error: DMA buffer size out of range\n");
2568 return kmem_start;
2569 }
2570
2571 printk(TPQIC_NAME ": DMA buffers: %u blocks", NR_BLK_BUF);
2572
2573 /* Setup the page-address for the dma transfer.
2574 * This assumes a one-to-one identity mapping between
2575 * kernel addresses and physical memory.
2576 */
2577 buffaddr = align_buffer((unsigned long) &tape_qic02_buf, TAPE_BLKSIZE);
2578 printk(", at address 0x%lx (0x%lx)\n", buffaddr, (unsigned long) &tape_qic02_buf);
2579
2580 #ifndef CONFIG_MAX_16M
2581 if (buffaddr+TPQBUF_SIZE>=0x1000000) {
2582 printk(TPQIC_NAME ": DMA buffer *must* be in lower 16MB\n");
2583 return kmem_start;
2584 }
2585 #endif
2586
2587 /* If we got this far, install driver functions */
2588 if (register_chrdev(QIC02_TAPE_MAJOR, TPQIC_NAME, &tape_qic02_fops)) {
2589 printk(TPQIC_NAME ": Unable to get chrdev major %d\n",
2590 QIC02_TAPE_MAJOR);
2591 return kmem_start;
2592 }
2593
2594 /* prepare timer */
2595 TIMEROFF;
2596 timer_table[TAPE_QIC02_TIMER].expires = 0;
2597 timer_table[TAPE_QIC02_TIMER].fn = tape_qic02_times_out;
2598
2599 if (tape_reset(0)!=TE_OK || tp_sense(TP_WRP|TP_POR|TP_CNI)!=TE_OK) {
2600 status_dead = YES;
2601 } else {
2602 if (is_exception()) {
2603 tpqputs("exception detected\n");
2604 (void) tp_sense(TP_WRP|TP_POR|TP_CNI);
2605 }
2606 }
2607
2608 /* initialize generic status for ioctl requests */
2609
2610 ioctl_status.mt_type = TAPE_QIC02_DRIVE; /* MT_IS* id nr */
2611
2612 ioctl_status.mt_resid = 0; /* ---residual count */
2613 ioctl_status.mt_gstat = 0; /* ---generic status */
2614 ioctl_status.mt_erreg = 0; /* not used */
2615 ioctl_status.mt_fileno = 0; /* number of current file on tape */
2616 ioctl_status.mt_blkno = 0; /* number of current (logical) block */
2617
2618 return kmem_start;
2619 } /* tape_qic02_init */
2620
2621
2622 #endif /* CONFIG_TAPE_QIC02 */
![[bottom]](../icons/n_bottom.png){kind=icon}
*/