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1 | /* |
2 | * Copyright (C) 1993-1996 Bas Laarhoven, | |
3 | * (C) 1996 Kai Harrekilde-Petersen, | |
4 | * (C) 1997 Claus-Justus Heine. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | ||
20 | * | |
21 | * $Source: /homes/cvs/ftape-stacked/ftape/lowlevel/ftape-io.c,v $ | |
22 | * $Revision: 1.4 $ | |
23 | * $Date: 1997/11/11 14:02:36 $ | |
24 | * | |
25 | * This file contains the general control functions for the | |
26 | * QIC-40/80/3010/3020 floppy-tape driver "ftape" for Linux. | |
27 | */ | |
28 | ||
29 | #include <linux/errno.h> | |
30 | #include <linux/sched.h> | |
31 | #include <linux/mm.h> | |
32 | #include <asm/system.h> | |
33 | #include <linux/ioctl.h> | |
34 | #include <linux/mtio.h> | |
35 | #include <linux/delay.h> | |
36 | ||
37 | #include <linux/ftape.h> | |
38 | #include <linux/qic117.h> | |
39 | #include "../lowlevel/ftape-tracing.h" | |
40 | #include "../lowlevel/fdc-io.h" | |
41 | #include "../lowlevel/ftape-io.h" | |
42 | #include "../lowlevel/ftape-ctl.h" | |
43 | #include "../lowlevel/ftape-rw.h" | |
44 | #include "../lowlevel/ftape-write.h" | |
45 | #include "../lowlevel/ftape-read.h" | |
46 | #include "../lowlevel/ftape-init.h" | |
47 | #include "../lowlevel/ftape-calibr.h" | |
48 | ||
49 | /* Global vars. | |
50 | */ | |
51 | /* NOTE: sectors start numbering at 1, all others at 0 ! */ | |
52 | ft_timeout_table ftape_timeout; | |
53 | unsigned int ftape_tape_len; | |
54 | volatile qic117_cmd_t ftape_current_command; | |
55 | const struct qic117_command_table qic117_cmds[] = QIC117_COMMANDS; | |
56 | int ftape_might_be_off_track; | |
57 | ||
58 | /* Local vars. | |
59 | */ | |
60 | static int diagnostic_mode; | |
61 | static unsigned int ftape_udelay_count; | |
62 | static unsigned int ftape_udelay_time; | |
63 | ||
64 | void ftape_udelay(unsigned int usecs) | |
65 | { | |
66 | volatile int count = (ftape_udelay_count * usecs + | |
67 | ftape_udelay_count - 1) / ftape_udelay_time; | |
68 | volatile int i; | |
69 | ||
70 | while (count-- > 0) { | |
71 | for (i = 0; i < 20; ++i); | |
72 | } | |
73 | } | |
74 | ||
75 | void ftape_udelay_calibrate(void) | |
76 | { | |
77 | ftape_calibrate("ftape_udelay", | |
78 | ftape_udelay, &ftape_udelay_count, &ftape_udelay_time); | |
79 | } | |
80 | ||
81 | /* Delay (msec) routine. | |
82 | */ | |
83 | void ftape_sleep(unsigned int time) | |
84 | { | |
85 | TRACE_FUN(ft_t_any); | |
86 | ||
87 | time *= 1000; /* msecs -> usecs */ | |
88 | if (time < FT_USPT) { | |
89 | /* Time too small for scheduler, do a busy wait ! */ | |
90 | ftape_udelay(time); | |
91 | } else { | |
92 | long timeout; | |
93 | unsigned long flags; | |
94 | unsigned int ticks = (time + FT_USPT - 1) / FT_USPT; | |
95 | ||
96 | TRACE(ft_t_any, "%d msec, %d ticks", time/1000, ticks); | |
97 | timeout = ticks; | |
98 | save_flags(flags); | |
99 | sti(); | |
100 | msleep_interruptible(jiffies_to_msecs(timeout)); | |
101 | /* Mmm. Isn't current->blocked == 0xffffffff ? | |
102 | */ | |
103 | if (signal_pending(current)) { | |
104 | TRACE(ft_t_err, "awoken by non-blocked signal :-("); | |
105 | } | |
106 | restore_flags(flags); | |
107 | } | |
108 | TRACE_EXIT; | |
109 | } | |
110 | ||
111 | /* send a command or parameter to the drive | |
112 | * Generates # of step pulses. | |
113 | */ | |
114 | static inline int ft_send_to_drive(int arg) | |
115 | { | |
116 | /* Always wait for a command_timeout period to separate | |
117 | * individuals commands and/or parameters. | |
118 | */ | |
119 | ftape_sleep(3 * FT_MILLISECOND); | |
120 | /* Keep cylinder nr within range, step towards home if possible. | |
121 | */ | |
122 | if (ftape_current_cylinder >= arg) { | |
123 | return fdc_seek(ftape_current_cylinder - arg); | |
124 | } else { | |
125 | return fdc_seek(ftape_current_cylinder + arg); | |
126 | } | |
127 | } | |
128 | ||
129 | /* forward */ int ftape_report_raw_drive_status(int *status); | |
130 | ||
131 | static int ft_check_cmd_restrictions(qic117_cmd_t command) | |
132 | { | |
133 | int status = -1; | |
134 | TRACE_FUN(ft_t_any); | |
135 | ||
136 | TRACE(ft_t_flow, "%s", qic117_cmds[command].name); | |
137 | /* A new motion command during an uninterruptible (motion) | |
138 | * command requires a ready status before the new command can | |
139 | * be issued. Otherwise a new motion command needs to be | |
140 | * checked against required status. | |
141 | */ | |
142 | if (qic117_cmds[command].cmd_type == motion && | |
143 | qic117_cmds[ftape_current_command].non_intr) { | |
144 | ftape_report_raw_drive_status(&status); | |
145 | if ((status & QIC_STATUS_READY) == 0) { | |
146 | TRACE(ft_t_noise, | |
147 | "motion cmd (%d) during non-intr cmd (%d)", | |
148 | command, ftape_current_command); | |
149 | TRACE(ft_t_noise, "waiting until drive gets ready"); | |
150 | ftape_ready_wait(ftape_timeout.seek, | |
151 | &status); | |
152 | } | |
153 | } | |
154 | if (qic117_cmds[command].mask != 0) { | |
155 | __u8 difference; | |
156 | /* Some commands do require a certain status: | |
157 | */ | |
158 | if (status == -1) { /* not yet set */ | |
159 | ftape_report_raw_drive_status(&status); | |
160 | } | |
161 | difference = ((status ^ qic117_cmds[command].state) & | |
162 | qic117_cmds[command].mask); | |
163 | /* Wait until the drive gets | |
164 | * ready. This may last forever if | |
165 | * the drive never gets ready... | |
166 | */ | |
167 | while ((difference & QIC_STATUS_READY) != 0) { | |
168 | TRACE(ft_t_noise, "command %d issued while not ready", | |
169 | command); | |
170 | TRACE(ft_t_noise, "waiting until drive gets ready"); | |
171 | if (ftape_ready_wait(ftape_timeout.seek, | |
172 | &status) == -EINTR) { | |
173 | /* Bail out on signal ! | |
174 | */ | |
175 | TRACE_ABORT(-EINTR, ft_t_warn, | |
176 | "interrupted by non-blockable signal"); | |
177 | } | |
178 | difference = ((status ^ qic117_cmds[command].state) & | |
179 | qic117_cmds[command].mask); | |
180 | } | |
181 | while ((difference & QIC_STATUS_ERROR) != 0) { | |
182 | int err; | |
183 | qic117_cmd_t cmd; | |
184 | ||
185 | TRACE(ft_t_noise, | |
186 | "command %d issued while error pending", | |
187 | command); | |
188 | TRACE(ft_t_noise, "clearing error status"); | |
189 | ftape_report_error(&err, &cmd, 1); | |
190 | ftape_report_raw_drive_status(&status); | |
191 | difference = ((status ^ qic117_cmds[command].state) & | |
192 | qic117_cmds[command].mask); | |
193 | if ((difference & QIC_STATUS_ERROR) != 0) { | |
194 | /* Bail out on fatal signal ! | |
195 | */ | |
196 | FT_SIGNAL_EXIT(_NEVER_BLOCK); | |
197 | } | |
198 | } | |
199 | if (difference) { | |
200 | /* Any remaining difference can't be solved | |
201 | * here. | |
202 | */ | |
203 | if (difference & (QIC_STATUS_CARTRIDGE_PRESENT | | |
204 | QIC_STATUS_NEW_CARTRIDGE | | |
205 | QIC_STATUS_REFERENCED)) { | |
206 | TRACE(ft_t_warn, | |
207 | "Fatal: tape removed or reinserted !"); | |
208 | ft_failure = 1; | |
209 | } else { | |
210 | TRACE(ft_t_err, "wrong state: 0x%02x should be: 0x%02x", | |
211 | status & qic117_cmds[command].mask, | |
212 | qic117_cmds[command].state); | |
213 | } | |
214 | TRACE_EXIT -EIO; | |
215 | } | |
216 | if (~status & QIC_STATUS_READY & qic117_cmds[command].mask) { | |
217 | TRACE_ABORT(-EBUSY, ft_t_err, "Bad: still busy!"); | |
218 | } | |
219 | } | |
220 | TRACE_EXIT 0; | |
221 | } | |
222 | ||
223 | /* Issue a tape command: | |
224 | */ | |
225 | int ftape_command(qic117_cmd_t command) | |
226 | { | |
227 | int result = 0; | |
228 | static int level; | |
229 | TRACE_FUN(ft_t_any); | |
230 | ||
231 | if ((unsigned int)command > NR_ITEMS(qic117_cmds)) { | |
232 | /* This is a bug we'll want to know about too. | |
233 | */ | |
234 | TRACE_ABORT(-EIO, ft_t_bug, "bug - bad command: %d", command); | |
235 | } | |
236 | if (++level > 5) { /* This is a bug we'll want to know about. */ | |
237 | --level; | |
238 | TRACE_ABORT(-EIO, ft_t_bug, "bug - recursion for command: %d", | |
239 | command); | |
240 | } | |
241 | /* disable logging and restriction check for some commands, | |
242 | * check all other commands that have a prescribed starting | |
243 | * status. | |
244 | */ | |
245 | if (diagnostic_mode) { | |
246 | TRACE(ft_t_flow, "diagnostic command %d", command); | |
247 | } else if (command == QIC_REPORT_DRIVE_STATUS || | |
248 | command == QIC_REPORT_NEXT_BIT) { | |
249 | TRACE(ft_t_any, "%s", qic117_cmds[command].name); | |
250 | } else { | |
251 | TRACE_CATCH(ft_check_cmd_restrictions(command), --level); | |
252 | } | |
253 | /* Now all conditions are met or result was < 0. | |
254 | */ | |
255 | result = ft_send_to_drive((unsigned int)command); | |
256 | if (qic117_cmds[command].cmd_type == motion && | |
257 | command != QIC_LOGICAL_FORWARD && command != QIC_STOP_TAPE) { | |
258 | ft_location.known = 0; | |
259 | } | |
260 | ftape_current_command = command; | |
261 | --level; | |
262 | TRACE_EXIT result; | |
263 | } | |
264 | ||
265 | /* Send a tape command parameter: | |
266 | * Generates command # of step pulses. | |
267 | * Skips tape-status call ! | |
268 | */ | |
269 | int ftape_parameter(unsigned int parameter) | |
270 | { | |
271 | TRACE_FUN(ft_t_any); | |
272 | ||
273 | TRACE(ft_t_flow, "called with parameter = %d", parameter); | |
274 | TRACE_EXIT ft_send_to_drive(parameter + 2); | |
275 | } | |
276 | ||
277 | /* Wait for the drive to get ready. | |
278 | * timeout time in milli-seconds | |
279 | * Returned status is valid if result != -EIO | |
280 | * | |
281 | * Should we allow to be killed by SIGINT? (^C) | |
282 | * Would be nice at least for large timeouts. | |
283 | */ | |
284 | int ftape_ready_wait(unsigned int timeout, int *status) | |
285 | { | |
286 | unsigned long t0; | |
287 | unsigned int poll_delay; | |
288 | int signal_retries; | |
289 | TRACE_FUN(ft_t_any); | |
290 | ||
291 | /* the following ** REALLY ** reduces the system load when | |
292 | * e.g. one simply rewinds or retensions. The tape is slow | |
293 | * anyway. It is really not necessary to detect error | |
294 | * conditions with 1/10 seconds granularity | |
295 | * | |
296 | * On my AMD 133MHZ 486: 100 ms: 23% system load | |
297 | * 1 sec: 5% | |
298 | * 5 sec: 0.6%, yeah | |
299 | */ | |
300 | if (timeout <= FT_SECOND) { | |
301 | poll_delay = 100 * FT_MILLISECOND; | |
302 | signal_retries = 20; /* two seconds */ | |
303 | } else if (timeout < 20 * FT_SECOND) { | |
304 | TRACE(ft_t_flow, "setting poll delay to 1 second"); | |
305 | poll_delay = FT_SECOND; | |
306 | signal_retries = 2; /* two seconds */ | |
307 | } else { | |
308 | TRACE(ft_t_flow, "setting poll delay to 5 seconds"); | |
309 | poll_delay = 5 * FT_SECOND; | |
310 | signal_retries = 1; /* five seconds */ | |
311 | } | |
312 | for (;;) { | |
313 | t0 = jiffies; | |
314 | TRACE_CATCH(ftape_report_raw_drive_status(status),); | |
315 | if (*status & QIC_STATUS_READY) { | |
316 | TRACE_EXIT 0; | |
317 | } | |
318 | if (!signal_retries--) { | |
319 | FT_SIGNAL_EXIT(_NEVER_BLOCK); | |
320 | } | |
321 | if ((int)timeout >= 0) { | |
322 | /* this will fail when jiffies wraps around about | |
323 | * once every year :-) | |
324 | */ | |
325 | timeout -= ((jiffies - t0) * FT_SECOND) / HZ; | |
326 | if (timeout <= 0) { | |
327 | TRACE_ABORT(-ETIME, ft_t_err, "timeout"); | |
328 | } | |
329 | ftape_sleep(poll_delay); | |
330 | timeout -= poll_delay; | |
331 | } else { | |
332 | ftape_sleep(poll_delay); | |
333 | } | |
334 | } | |
335 | TRACE_EXIT -ETIME; | |
336 | } | |
337 | ||
338 | /* Issue command and wait up to timeout milli seconds for drive ready | |
339 | */ | |
340 | int ftape_command_wait(qic117_cmd_t command, unsigned int timeout, int *status) | |
341 | { | |
342 | int result; | |
343 | ||
344 | /* Drive should be ready, issue command | |
345 | */ | |
346 | result = ftape_command(command); | |
347 | if (result >= 0) { | |
348 | result = ftape_ready_wait(timeout, status); | |
349 | } | |
350 | return result; | |
351 | } | |
352 | ||
353 | static int ftape_parameter_wait(unsigned int parm, unsigned int timeout, int *status) | |
354 | { | |
355 | int result; | |
356 | ||
357 | /* Drive should be ready, issue command | |
358 | */ | |
359 | result = ftape_parameter(parm); | |
360 | if (result >= 0) { | |
361 | result = ftape_ready_wait(timeout, status); | |
362 | } | |
363 | return result; | |
364 | } | |
365 | ||
366 | /*-------------------------------------------------------------------------- | |
367 | * Report operations | |
368 | */ | |
369 | ||
370 | /* Query the drive about its status. The command is sent and | |
371 | result_length bits of status are returned (2 extra bits are read | |
372 | for start and stop). */ | |
373 | ||
374 | int ftape_report_operation(int *status, | |
375 | qic117_cmd_t command, | |
376 | int result_length) | |
377 | { | |
378 | int i, st3; | |
379 | unsigned int t0; | |
380 | unsigned int dt; | |
381 | TRACE_FUN(ft_t_any); | |
382 | ||
383 | TRACE_CATCH(ftape_command(command),); | |
384 | t0 = ftape_timestamp(); | |
385 | i = 0; | |
386 | do { | |
387 | ++i; | |
388 | ftape_sleep(3 * FT_MILLISECOND); /* see remark below */ | |
389 | TRACE_CATCH(fdc_sense_drive_status(&st3),); | |
390 | dt = ftape_timediff(t0, ftape_timestamp()); | |
391 | /* Ack should be asserted within Ttimout + Tack = 6 msec. | |
392 | * Looks like some drives fail to do this so extend this | |
393 | * period to 300 msec. | |
394 | */ | |
395 | } while (!(st3 & ST3_TRACK_0) && dt < 300000); | |
396 | if (!(st3 & ST3_TRACK_0)) { | |
397 | TRACE(ft_t_err, | |
398 | "No acknowledge after %u msec. (%i iter)", dt / 1000, i); | |
399 | TRACE_ABORT(-EIO, ft_t_err, "timeout on Acknowledge"); | |
400 | } | |
401 | /* dt may be larger than expected because of other tasks | |
402 | * scheduled while we were sleeping. | |
403 | */ | |
404 | if (i > 1 && dt > 6000) { | |
405 | TRACE(ft_t_err, "Acknowledge after %u msec. (%i iter)", | |
406 | dt / 1000, i); | |
407 | } | |
408 | *status = 0; | |
409 | for (i = 0; i < result_length + 1; i++) { | |
410 | TRACE_CATCH(ftape_command(QIC_REPORT_NEXT_BIT),); | |
411 | TRACE_CATCH(fdc_sense_drive_status(&st3),); | |
412 | if (i < result_length) { | |
413 | *status |= ((st3 & ST3_TRACK_0) ? 1 : 0) << i; | |
414 | } else if ((st3 & ST3_TRACK_0) == 0) { | |
415 | TRACE_ABORT(-EIO, ft_t_err, "missing status stop bit"); | |
416 | } | |
417 | } | |
418 | /* this command will put track zero and index back into normal state */ | |
419 | (void)ftape_command(QIC_REPORT_NEXT_BIT); | |
420 | TRACE_EXIT 0; | |
421 | } | |
422 | ||
423 | /* Report the current drive status. */ | |
424 | ||
425 | int ftape_report_raw_drive_status(int *status) | |
426 | { | |
427 | int result; | |
428 | int count = 0; | |
429 | TRACE_FUN(ft_t_any); | |
430 | ||
431 | do { | |
432 | result = ftape_report_operation(status, | |
433 | QIC_REPORT_DRIVE_STATUS, 8); | |
434 | } while (result < 0 && ++count <= 3); | |
435 | if (result < 0) { | |
436 | TRACE_ABORT(-EIO, ft_t_err, | |
437 | "report_operation failed after %d trials", count); | |
438 | } | |
439 | if ((*status & 0xff) == 0xff) { | |
440 | TRACE_ABORT(-EIO, ft_t_err, | |
441 | "impossible drive status 0xff"); | |
442 | } | |
443 | if (*status & QIC_STATUS_READY) { | |
444 | ftape_current_command = QIC_NO_COMMAND; /* completed */ | |
445 | } | |
446 | ft_last_status.status.drive_status = (__u8)(*status & 0xff); | |
447 | TRACE_EXIT 0; | |
448 | } | |
449 | ||
450 | int ftape_report_drive_status(int *status) | |
451 | { | |
452 | TRACE_FUN(ft_t_any); | |
453 | ||
454 | TRACE_CATCH(ftape_report_raw_drive_status(status),); | |
455 | if (*status & QIC_STATUS_NEW_CARTRIDGE || | |
456 | !(*status & QIC_STATUS_CARTRIDGE_PRESENT)) { | |
457 | ft_failure = 1; /* will inhibit further operations */ | |
458 | TRACE_EXIT -EIO; | |
459 | } | |
460 | if (*status & QIC_STATUS_READY && *status & QIC_STATUS_ERROR) { | |
461 | /* Let caller handle all errors */ | |
462 | TRACE_ABORT(1, ft_t_warn, "warning: error status set!"); | |
463 | } | |
464 | TRACE_EXIT 0; | |
465 | } | |
466 | ||
467 | int ftape_report_error(unsigned int *error, | |
468 | qic117_cmd_t *command, int report) | |
469 | { | |
470 | static const ftape_error ftape_errors[] = QIC117_ERRORS; | |
471 | int code; | |
472 | TRACE_FUN(ft_t_any); | |
473 | ||
474 | TRACE_CATCH(ftape_report_operation(&code, QIC_REPORT_ERROR_CODE, 16),); | |
475 | *error = (unsigned int)(code & 0xff); | |
476 | *command = (qic117_cmd_t)((code>>8)&0xff); | |
477 | /* remember hardware status, maybe useful for status ioctls | |
478 | */ | |
479 | ft_last_error.error.command = (__u8)*command; | |
480 | ft_last_error.error.error = (__u8)*error; | |
481 | if (!report) { | |
482 | TRACE_EXIT 0; | |
483 | } | |
484 | if (*error == 0) { | |
485 | TRACE_ABORT(0, ft_t_info, "No error"); | |
486 | } | |
487 | TRACE(ft_t_info, "errorcode: %d", *error); | |
488 | if (*error < NR_ITEMS(ftape_errors)) { | |
489 | TRACE(ft_t_noise, "%sFatal ERROR:", | |
490 | (ftape_errors[*error].fatal ? "" : "Non-")); | |
491 | TRACE(ft_t_noise, "%s ...", ftape_errors[*error].message); | |
492 | } else { | |
493 | TRACE(ft_t_noise, "Unknown ERROR !"); | |
494 | } | |
495 | if ((unsigned int)*command < NR_ITEMS(qic117_cmds) && | |
496 | qic117_cmds[*command].name != NULL) { | |
497 | TRACE(ft_t_noise, "... caused by command \'%s\'", | |
498 | qic117_cmds[*command].name); | |
499 | } else { | |
500 | TRACE(ft_t_noise, "... caused by unknown command %d", | |
501 | *command); | |
502 | } | |
503 | TRACE_EXIT 0; | |
504 | } | |
505 | ||
506 | int ftape_report_configuration(qic_model *model, | |
507 | unsigned int *rate, | |
508 | int *qic_std, | |
509 | int *tape_len) | |
510 | { | |
511 | int result; | |
512 | int config; | |
513 | int status; | |
514 | static const unsigned int qic_rates[ 4] = { 250, 2000, 500, 1000 }; | |
515 | TRACE_FUN(ft_t_any); | |
516 | ||
517 | result = ftape_report_operation(&config, | |
518 | QIC_REPORT_DRIVE_CONFIGURATION, 8); | |
519 | if (result < 0) { | |
520 | ft_last_status.status.drive_config = (__u8)0x00; | |
521 | *model = prehistoric; | |
522 | *rate = 500; | |
523 | *qic_std = QIC_TAPE_QIC40; | |
524 | *tape_len = 205; | |
525 | TRACE_EXIT 0; | |
526 | } else { | |
527 | ft_last_status.status.drive_config = (__u8)(config & 0xff); | |
528 | } | |
529 | *rate = qic_rates[(config & QIC_CONFIG_RATE_MASK) >> QIC_CONFIG_RATE_SHIFT]; | |
530 | result = ftape_report_operation(&status, QIC_REPORT_TAPE_STATUS, 8); | |
531 | if (result < 0) { | |
532 | ft_last_status.status.tape_status = (__u8)0x00; | |
533 | /* pre- QIC117 rev C spec. drive, QIC_CONFIG_80 bit is valid. | |
534 | */ | |
535 | *qic_std = (config & QIC_CONFIG_80) ? | |
536 | QIC_TAPE_QIC80 : QIC_TAPE_QIC40; | |
537 | /* ?? how's about 425ft tapes? */ | |
538 | *tape_len = (config & QIC_CONFIG_LONG) ? 307 : 0; | |
539 | *model = pre_qic117c; | |
540 | result = 0; | |
541 | } else { | |
542 | ft_last_status.status.tape_status = (__u8)(status & 0xff); | |
543 | *model = post_qic117b; | |
544 | TRACE(ft_t_any, "report tape status result = %02x", status); | |
545 | /* post- QIC117 rev C spec. drive, QIC_CONFIG_80 bit is | |
546 | * invalid. | |
547 | */ | |
548 | switch (status & QIC_TAPE_STD_MASK) { | |
549 | case QIC_TAPE_QIC40: | |
550 | case QIC_TAPE_QIC80: | |
551 | case QIC_TAPE_QIC3020: | |
552 | case QIC_TAPE_QIC3010: | |
553 | *qic_std = status & QIC_TAPE_STD_MASK; | |
554 | break; | |
555 | default: | |
556 | *qic_std = -1; | |
557 | break; | |
558 | } | |
559 | switch (status & QIC_TAPE_LEN_MASK) { | |
560 | case QIC_TAPE_205FT: | |
561 | /* 205 or 425+ ft 550 Oe tape */ | |
562 | *tape_len = 0; | |
563 | break; | |
564 | case QIC_TAPE_307FT: | |
565 | /* 307.5 ft 550 Oe Extended Length (XL) tape */ | |
566 | *tape_len = 307; | |
567 | break; | |
568 | case QIC_TAPE_VARIABLE: | |
569 | /* Variable length 550 Oe tape */ | |
570 | *tape_len = 0; | |
571 | break; | |
572 | case QIC_TAPE_1100FT: | |
573 | /* 1100 ft 550 Oe tape */ | |
574 | *tape_len = 1100; | |
575 | break; | |
576 | case QIC_TAPE_FLEX: | |
577 | /* Variable length 900 Oe tape */ | |
578 | *tape_len = 0; | |
579 | break; | |
580 | default: | |
581 | *tape_len = -1; | |
582 | break; | |
583 | } | |
584 | if (*qic_std == -1 || *tape_len == -1) { | |
585 | TRACE(ft_t_any, | |
586 | "post qic-117b spec drive with unknown tape"); | |
587 | } | |
588 | result = *tape_len == -1 ? -EIO : 0; | |
589 | if (status & QIC_TAPE_WIDE) { | |
590 | switch (*qic_std) { | |
591 | case QIC_TAPE_QIC80: | |
592 | TRACE(ft_t_info, "TR-1 tape detected"); | |
593 | break; | |
594 | case QIC_TAPE_QIC3010: | |
595 | TRACE(ft_t_info, "TR-2 tape detected"); | |
596 | break; | |
597 | case QIC_TAPE_QIC3020: | |
598 | TRACE(ft_t_info, "TR-3 tape detected"); | |
599 | break; | |
600 | default: | |
601 | TRACE(ft_t_warn, | |
602 | "Unknown Travan tape type detected"); | |
603 | break; | |
604 | } | |
605 | } | |
606 | } | |
607 | TRACE_EXIT (result < 0) ? -EIO : 0; | |
608 | } | |
609 | ||
610 | static int ftape_report_rom_version(int *version) | |
611 | { | |
612 | ||
613 | if (ftape_report_operation(version, QIC_REPORT_ROM_VERSION, 8) < 0) { | |
614 | return -EIO; | |
615 | } else { | |
616 | return 0; | |
617 | } | |
618 | } | |
619 | ||
620 | void ftape_report_vendor_id(unsigned int *id) | |
621 | { | |
622 | int result; | |
623 | TRACE_FUN(ft_t_any); | |
624 | ||
625 | /* We'll try to get a vendor id from the drive. First | |
626 | * according to the QIC-117 spec, a 16-bit id is requested. | |
627 | * If that fails we'll try an 8-bit version, otherwise we'll | |
628 | * try an undocumented query. | |
629 | */ | |
630 | result = ftape_report_operation((int *) id, QIC_REPORT_VENDOR_ID, 16); | |
631 | if (result < 0) { | |
632 | result = ftape_report_operation((int *) id, | |
633 | QIC_REPORT_VENDOR_ID, 8); | |
634 | if (result < 0) { | |
635 | /* The following is an undocumented call found | |
636 | * in the CMS code. | |
637 | */ | |
638 | result = ftape_report_operation((int *) id, 24, 8); | |
639 | if (result < 0) { | |
640 | *id = UNKNOWN_VENDOR; | |
641 | } else { | |
642 | TRACE(ft_t_noise, "got old 8 bit id: %04x", | |
643 | *id); | |
644 | *id |= 0x20000; | |
645 | } | |
646 | } else { | |
647 | TRACE(ft_t_noise, "got 8 bit id: %04x", *id); | |
648 | *id |= 0x10000; | |
649 | } | |
650 | } else { | |
651 | TRACE(ft_t_noise, "got 16 bit id: %04x", *id); | |
652 | } | |
653 | if (*id == 0x0047) { | |
654 | int version; | |
655 | int sign; | |
656 | ||
657 | if (ftape_report_rom_version(&version) < 0) { | |
658 | TRACE(ft_t_bug, "report rom version failed"); | |
659 | TRACE_EXIT; | |
660 | } | |
661 | TRACE(ft_t_noise, "CMS rom version: %d", version); | |
662 | ftape_command(QIC_ENTER_DIAGNOSTIC_1); | |
663 | ftape_command(QIC_ENTER_DIAGNOSTIC_1); | |
664 | diagnostic_mode = 1; | |
665 | if (ftape_report_operation(&sign, 9, 8) < 0) { | |
666 | unsigned int error; | |
667 | qic117_cmd_t command; | |
668 | ||
669 | ftape_report_error(&error, &command, 1); | |
670 | ftape_command(QIC_ENTER_PRIMARY_MODE); | |
671 | diagnostic_mode = 0; | |
672 | TRACE_EXIT; /* failure ! */ | |
673 | } else { | |
674 | TRACE(ft_t_noise, "CMS signature: %02x", sign); | |
675 | } | |
676 | if (sign == 0xa5) { | |
677 | result = ftape_report_operation(&sign, 37, 8); | |
678 | if (result < 0) { | |
679 | if (version >= 63) { | |
680 | *id = 0x8880; | |
681 | TRACE(ft_t_noise, | |
682 | "This is an Iomega drive !"); | |
683 | } else { | |
684 | *id = 0x0047; | |
685 | TRACE(ft_t_noise, | |
686 | "This is a real CMS drive !"); | |
687 | } | |
688 | } else { | |
689 | *id = 0x0047; | |
690 | TRACE(ft_t_noise, "CMS status: %d", sign); | |
691 | } | |
692 | } else { | |
693 | *id = UNKNOWN_VENDOR; | |
694 | } | |
695 | ftape_command(QIC_ENTER_PRIMARY_MODE); | |
696 | diagnostic_mode = 0; | |
697 | } | |
698 | TRACE_EXIT; | |
699 | } | |
700 | ||
701 | static int qic_rate_code(unsigned int rate) | |
702 | { | |
703 | switch (rate) { | |
704 | case 250: | |
705 | return QIC_CONFIG_RATE_250; | |
706 | case 500: | |
707 | return QIC_CONFIG_RATE_500; | |
708 | case 1000: | |
709 | return QIC_CONFIG_RATE_1000; | |
710 | case 2000: | |
711 | return QIC_CONFIG_RATE_2000; | |
712 | default: | |
713 | return QIC_CONFIG_RATE_500; | |
714 | } | |
715 | } | |
716 | ||
717 | static int ftape_set_rate_test(unsigned int *max_rate) | |
718 | { | |
719 | unsigned int error; | |
720 | qic117_cmd_t command; | |
721 | int status; | |
722 | int supported = 0; | |
723 | TRACE_FUN(ft_t_any); | |
724 | ||
725 | /* Check if the drive does support the select rate command | |
726 | * by testing all different settings. If any one is accepted | |
727 | * we assume the command is supported, else not. | |
728 | */ | |
729 | for (*max_rate = 2000; *max_rate >= 250; *max_rate /= 2) { | |
730 | if (ftape_command(QIC_SELECT_RATE) < 0) { | |
731 | continue; | |
732 | } | |
733 | if (ftape_parameter_wait(qic_rate_code(*max_rate), | |
734 | 1 * FT_SECOND, &status) < 0) { | |
735 | continue; | |
736 | } | |
737 | if (status & QIC_STATUS_ERROR) { | |
738 | ftape_report_error(&error, &command, 0); | |
739 | continue; | |
740 | } | |
741 | supported = 1; /* did accept a request */ | |
742 | break; | |
743 | } | |
744 | TRACE(ft_t_noise, "Select Rate command is%s supported", | |
745 | supported ? "" : " not"); | |
746 | TRACE_EXIT supported; | |
747 | } | |
748 | ||
749 | int ftape_set_data_rate(unsigned int new_rate /* Kbps */, unsigned int qic_std) | |
750 | { | |
751 | int status; | |
752 | int result = 0; | |
753 | unsigned int data_rate = new_rate; | |
754 | static int supported; | |
755 | int rate_changed = 0; | |
756 | qic_model dummy_model; | |
757 | unsigned int dummy_qic_std, dummy_tape_len; | |
758 | TRACE_FUN(ft_t_any); | |
759 | ||
760 | if (ft_drive_max_rate == 0) { /* first time */ | |
761 | supported = ftape_set_rate_test(&ft_drive_max_rate); | |
762 | } | |
763 | if (supported) { | |
764 | ftape_command(QIC_SELECT_RATE); | |
765 | result = ftape_parameter_wait(qic_rate_code(new_rate), | |
766 | 1 * FT_SECOND, &status); | |
767 | if (result >= 0 && !(status & QIC_STATUS_ERROR)) { | |
768 | rate_changed = 1; | |
769 | } | |
770 | } | |
771 | TRACE_CATCH(result = ftape_report_configuration(&dummy_model, | |
772 | &data_rate, | |
773 | &dummy_qic_std, | |
774 | &dummy_tape_len),); | |
775 | if (data_rate != new_rate) { | |
776 | if (!supported) { | |
777 | TRACE(ft_t_warn, "Rate change not supported!"); | |
778 | } else if (rate_changed) { | |
779 | TRACE(ft_t_warn, "Requested: %d, got %d", | |
780 | new_rate, data_rate); | |
781 | } else { | |
782 | TRACE(ft_t_warn, "Rate change failed!"); | |
783 | } | |
784 | result = -EINVAL; | |
785 | } | |
786 | /* | |
787 | * Set data rate and write precompensation as specified: | |
788 | * | |
789 | * | QIC-40/80 | QIC-3010/3020 | |
790 | * rate | precomp | precomp | |
791 | * ----------+-------------+-------------- | |
792 | * 250 Kbps. | 250 ns. | 0 ns. | |
793 | * 500 Kbps. | 125 ns. | 0 ns. | |
794 | * 1 Mbps. | 42 ns. | 0 ns. | |
795 | * 2 Mbps | N/A | 0 ns. | |
796 | */ | |
797 | if ((qic_std == QIC_TAPE_QIC40 && data_rate > 500) || | |
798 | (qic_std == QIC_TAPE_QIC80 && data_rate > 1000)) { | |
799 | TRACE_ABORT(-EINVAL, | |
800 | ft_t_warn, "Datarate too high for QIC-mode"); | |
801 | } | |
802 | TRACE_CATCH(fdc_set_data_rate(data_rate),_res = -EINVAL); | |
803 | ft_data_rate = data_rate; | |
804 | if (qic_std == QIC_TAPE_QIC40 || qic_std == QIC_TAPE_QIC80) { | |
805 | switch (data_rate) { | |
806 | case 250: | |
807 | fdc_set_write_precomp(250); | |
808 | break; | |
809 | default: | |
810 | case 500: | |
811 | fdc_set_write_precomp(125); | |
812 | break; | |
813 | case 1000: | |
814 | fdc_set_write_precomp(42); | |
815 | break; | |
816 | } | |
817 | } else { | |
818 | fdc_set_write_precomp(0); | |
819 | } | |
820 | TRACE_EXIT result; | |
821 | } | |
822 | ||
823 | /* The next two functions are used to cope with excessive overrun errors | |
824 | */ | |
825 | int ftape_increase_threshold(void) | |
826 | { | |
827 | TRACE_FUN(ft_t_flow); | |
828 | ||
829 | if (fdc.type < i82077 || ft_fdc_threshold >= 12) { | |
830 | TRACE_ABORT(-EIO, ft_t_err, "cannot increase fifo threshold"); | |
831 | } | |
832 | if (fdc_fifo_threshold(++ft_fdc_threshold, NULL, NULL, NULL) < 0) { | |
833 | TRACE(ft_t_err, "cannot increase fifo threshold"); | |
834 | ft_fdc_threshold --; | |
835 | fdc_reset(); | |
836 | } | |
837 | TRACE(ft_t_info, "New FIFO threshold: %d", ft_fdc_threshold); | |
838 | TRACE_EXIT 0; | |
839 | } | |
840 | ||
841 | int ftape_half_data_rate(void) | |
842 | { | |
843 | if (ft_data_rate < 500) { | |
844 | return -1; | |
845 | } | |
846 | if (ftape_set_data_rate(ft_data_rate / 2, ft_qic_std) < 0) { | |
847 | return -EIO; | |
848 | } | |
849 | ftape_calc_timeouts(ft_qic_std, ft_data_rate, ftape_tape_len); | |
850 | return 0; | |
851 | } | |
852 | ||
853 | /* Seek the head to the specified track. | |
854 | */ | |
855 | int ftape_seek_head_to_track(unsigned int track) | |
856 | { | |
857 | int status; | |
858 | TRACE_FUN(ft_t_any); | |
859 | ||
860 | ft_location.track = -1; /* remains set in case of error */ | |
861 | if (track >= ft_tracks_per_tape) { | |
862 | TRACE_ABORT(-EINVAL, ft_t_bug, "track out of bounds"); | |
863 | } | |
864 | TRACE(ft_t_flow, "seeking track %d", track); | |
865 | TRACE_CATCH(ftape_command(QIC_SEEK_HEAD_TO_TRACK),); | |
866 | TRACE_CATCH(ftape_parameter_wait(track, ftape_timeout.head_seek, | |
867 | &status),); | |
868 | ft_location.track = track; | |
869 | ftape_might_be_off_track = 0; | |
870 | TRACE_EXIT 0; | |
871 | } | |
872 | ||
873 | int ftape_wakeup_drive(wake_up_types method) | |
874 | { | |
875 | int status; | |
876 | int motor_on = 0; | |
877 | TRACE_FUN(ft_t_any); | |
878 | ||
879 | switch (method) { | |
880 | case wake_up_colorado: | |
881 | TRACE_CATCH(ftape_command(QIC_PHANTOM_SELECT),); | |
882 | TRACE_CATCH(ftape_parameter(0 /* ft_drive_sel ?? */),); | |
883 | break; | |
884 | case wake_up_mountain: | |
885 | TRACE_CATCH(ftape_command(QIC_SOFT_SELECT),); | |
886 | ftape_sleep(FT_MILLISECOND); /* NEEDED */ | |
887 | TRACE_CATCH(ftape_parameter(18),); | |
888 | break; | |
889 | case wake_up_insight: | |
890 | ftape_sleep(100 * FT_MILLISECOND); | |
891 | motor_on = 1; | |
892 | fdc_motor(motor_on); /* enable is done by motor-on */ | |
893 | case no_wake_up: | |
894 | break; | |
895 | default: | |
896 | TRACE_EXIT -ENODEV; /* unknown wakeup method */ | |
897 | break; | |
898 | } | |
899 | /* If wakeup succeeded we shouldn't get an error here.. | |
900 | */ | |
901 | TRACE_CATCH(ftape_report_raw_drive_status(&status), | |
902 | if (motor_on) { | |
903 | fdc_motor(0); | |
904 | }); | |
905 | TRACE_EXIT 0; | |
906 | } | |
907 | ||
908 | int ftape_put_drive_to_sleep(wake_up_types method) | |
909 | { | |
910 | TRACE_FUN(ft_t_any); | |
911 | ||
912 | switch (method) { | |
913 | case wake_up_colorado: | |
914 | TRACE_CATCH(ftape_command(QIC_PHANTOM_DESELECT),); | |
915 | break; | |
916 | case wake_up_mountain: | |
917 | TRACE_CATCH(ftape_command(QIC_SOFT_DESELECT),); | |
918 | break; | |
919 | case wake_up_insight: | |
920 | fdc_motor(0); /* enable is done by motor-on */ | |
921 | case no_wake_up: /* no wakeup / no sleep ! */ | |
922 | break; | |
923 | default: | |
924 | TRACE_EXIT -ENODEV; /* unknown wakeup method */ | |
925 | } | |
926 | TRACE_EXIT 0; | |
927 | } | |
928 | ||
929 | int ftape_reset_drive(void) | |
930 | { | |
931 | int result = 0; | |
932 | int status; | |
933 | unsigned int err_code; | |
934 | qic117_cmd_t err_command; | |
935 | int i; | |
936 | TRACE_FUN(ft_t_any); | |
937 | ||
938 | /* We want to re-establish contact with our drive. Fire a | |
939 | * number of reset commands (single step pulses) and pray for | |
940 | * success. | |
941 | */ | |
942 | for (i = 0; i < 2; ++i) { | |
943 | TRACE(ft_t_flow, "Resetting fdc"); | |
944 | fdc_reset(); | |
945 | ftape_sleep(10 * FT_MILLISECOND); | |
946 | TRACE(ft_t_flow, "Reset command to drive"); | |
947 | result = ftape_command(QIC_RESET); | |
948 | if (result == 0) { | |
949 | ftape_sleep(1 * FT_SECOND); /* drive not | |
950 | * accessible | |
951 | * during 1 second | |
952 | */ | |
953 | TRACE(ft_t_flow, "Re-selecting drive"); | |
954 | ||
955 | /* Strange, the QIC-117 specs don't mention | |
956 | * this but the drive gets deselected after a | |
957 | * soft reset ! So we need to enable it | |
958 | * again. | |
959 | */ | |
960 | if (ftape_wakeup_drive(ft_drive_type.wake_up) < 0) { | |
961 | TRACE(ft_t_err, "Wakeup failed !"); | |
962 | } | |
963 | TRACE(ft_t_flow, "Waiting until drive gets ready"); | |
964 | result= ftape_ready_wait(ftape_timeout.reset, &status); | |
965 | if (result == 0 && (status & QIC_STATUS_ERROR)) { | |
966 | result = ftape_report_error(&err_code, | |
967 | &err_command, 1); | |
968 | if (result == 0 && err_code == 27) { | |
969 | /* Okay, drive saw reset | |
970 | * command and responded as it | |
971 | * should | |
972 | */ | |
973 | break; | |
974 | } else { | |
975 | result = -EIO; | |
976 | } | |
977 | } else { | |
978 | result = -EIO; | |
979 | } | |
980 | } | |
981 | FT_SIGNAL_EXIT(_DONT_BLOCK); | |
982 | } | |
983 | if (result != 0) { | |
984 | TRACE(ft_t_err, "General failure to reset tape drive"); | |
985 | } else { | |
986 | /* Restore correct settings: keep original rate | |
987 | */ | |
988 | ftape_set_data_rate(ft_data_rate, ft_qic_std); | |
989 | } | |
990 | ftape_init_drive_needed = 1; | |
991 | TRACE_EXIT result; | |
992 | } |