1 /*
2 * linux/kernel/arch/arm/drivers/block/fd1772.c
3 * Based on ataflop.c in the m68k Linux
4 * Copyright (C) 1993 Greg Harp
5 * Atari Support by Bjoern Brauel, Roman Hodek
6 * Archimedes Support by Dave Gilbert (linux@treblig.org)
7 *
8 * Big cleanup Sep 11..14 1994 Roman Hodek:
9 * - Driver now works interrupt driven
10 * - Support for two drives; should work, but I cannot test that :-(
11 * - Reading is done in whole tracks and buffered to speed up things
12 * - Disk change detection and drive deselecting after motor-off
13 * similar to TOS
14 * - Autodetection of disk format (DD/HD); untested yet, because I
15 * don't have an HD drive :-(
16 *
17 * Fixes Nov 13 1994 Martin Schaller:
18 * - Autodetection works now
19 * - Support for 5 1/4" disks
20 * - Removed drive type (unknown on atari)
21 * - Do seeks with 8 Mhz
22 *
23 * Changes by Andreas Schwab:
24 * - After errors in multiple read mode try again reading single sectors
25 * (Feb 1995):
26 * - Clean up error handling
27 * - Set blk_size for proper size checking
28 * - Initialize track register when testing presence of floppy
29 * - Implement some ioctl's
30 *
31 * Changes by Torsten Lang:
32 * - When probing the floppies we should add the FDC1772CMDADD_H flag since
33 * the FDC1772 will otherwise wait forever when no disk is inserted...
34 *
35 * Things left to do:
36 * - Formatting
37 * - Maybe a better strategy for disk change detection (does anyone
38 * know one?)
39 * - There are some strange problems left: The strangest one is
40 * that, at least on my TT (4+4MB), the first 2 Bytes of the last
41 * page of the TT-Ram (!) change their contents (some bits get
42 * set) while a floppy DMA is going on. But there are no accesses
43 * to these memory locations from the kernel... (I tested that by
44 * making the page read-only). I cannot explain what's going on...
45 * - Sometimes the drive-change-detection stops to work. The
46 * function is still called, but the WP bit always reads as 0...
47 * Maybe a problem with the status reg mode or a timing problem.
48 * Note 10/12/94: The change detection now seems to work reliably.
49 * There is no proof, but I've seen no hang for a long time...
50 *
51 * ARCHIMEDES changes: (gilbertd@cs.man.ac.uk)
52 * 26/12/95 - Changed all names starting with FDC to FDC1772
53 * Removed all references to clock speed of FDC - we're stuck with 8MHz
54 * Modified disk_type structure to remove HD formats
55 *
56 * 7/ 1/96 - Wrote FIQ code, removed most remaining atariisms
57 *
58 * 13/ 1/96 - Well I think its read a single sector; but there is a problem
59 * fd_rwsec_done which is called in FIQ mode starts another transfer
60 * off (in fd_rwsec) while still in FIQ mode. Because its still in
61 * FIQ mode it can't service the DMA and loses data. So need to
62 * heavily restructure.
63 * 14/ 1/96 - Found that the definitions of the register numbers of the
64 * FDC were multiplied by 2 in the header for the 16bit words
65 * of the atari so half the writes were going in the wrong place.
66 * Also realised that the FIQ entry didn't make any attempt to
67 * preserve registers or return correctly; now in assembler.
68 *
69 * 11/ 2/96 - Hmm - doesn't work on real machine. Auto detect doesn't
70 * and hacking that past seems to wait forever - check motor
71 * being turned on.
72 *
73 * 17/ 2/96 - still having problems - forcing track to -1 when selecting
74 * new drives seems to allow it to read first few sectors
75 * but then we get solid hangs at apparently random places
76 * which change depending what is happening.
77 *
78 * 9/ 3/96 - Fiddled a lot of stuff around to move to kernel 1.3.35
79 * A lot of fiddling in DMA stuff. Having problems with it
80 * constnatly thinking its timeing out. Ah - its timeout
81 * was set to (6*HZ) rather than jiffies+(6*HZ). Now giving
82 * duff data!
83 *
84 * 5/ 4/96 - Made it use the new IOC_ macros rather than *ioc
85 * Hmm - giving unexpected FIQ and then timeouts
86 * 18/ 8/96 - Ran through indent -kr -i8
87 * Some changes to disc change detect; don't know how well it
88 * works.
89 * 24/ 8/96 - Put all the track buffering code back in from the atari
90 * code - I wonder if it will still work... No :-)
91 * Still works if I turn off track buffering.
92 * 25/ 8/96 - Changed the timer expires that I'd added back to be
93 * jiffies + ....; and it all sprang to life! Got 2.8K/sec
94 * off a cp -r of a 679K disc (showed 94% cpu usage!)
95 * (PC gets 14.3K/sec - 0% CPU!) Hmm - hard drive corrupt!
96 * Also perhaps that compile was with cache off.
97 * changed cli in fd_readtrack_check to cliIF
98 * changed vmallocs to kmalloc (whats the difference!!)
99 * Removed the busy wait loop in do_fd_request and replaced
100 * by a routine on tq_immediate; only 11% cpu on a dd off the
101 * raw disc - but the speed is the same.
102 * 1/ 9/96 - Idea (failed!) - set the 'disable spin-up seqeunce'
103 * when we read the track if we know the motor is on; didn't
104 * help - perhaps we have to do it in stepping as well.
105 * Nope. Still doesn't help.
106 * Hmm - what seems to be happening is that fd_readtrack_check
107 * is never getting called. Its job is to terminate the read
108 * just after we think we should have got the data; otherwise
109 * the fdc takes 1 second to timeout; which is what's happening
110 * Now I can see 'readtrack_timer' being set (which should do the
111 * call); but it never seems to be called - hmm!
112 * OK - I've moved the check to my tq_immediate code -
113 * and it WORKS! 13.95K/second at 19% CPU.
114 * I wish I knew why that timer didn't work.....
115 *
116 * 16/11/96 - Fiddled and frigged for 2.0.18
117 *
118 * DAG 30/01/99 - Started frobbing for 2.2.1
119 * DAG 20/06/99 - A little more frobbing:
120 * Included include/asm/uaccess.h for get_user/put_user
121 *
122 * DAG 1/09/00 - Dusted off for 2.4.0-test7
123 * MAX_SECTORS was name clashing so it is now FD1772_...
124 * Minor parameter, name layouts for 2.4.x differences
125 */
126
127 #include <linux/sched.h>
128 #include <linux/fs.h>
129 #include <linux/fcntl.h>
130 #include <linux/slab.h>
131 #include <linux/kernel.h>
132 #include <linux/interrupt.h>
133 #include <linux/timer.h>
134 #include <linux/tqueue.h>
135 #include <linux/fd.h>
136 #include <linux/fd1772.h>
137 #include <linux/errno.h>
138 #include <linux/types.h>
139 #include <linux/delay.h>
140 #include <linux/mm.h>
141
142 #include <asm/arch/oldlatches.h>
143 #include <asm/bitops.h>
144 #include <asm/dma.h>
145 #include <asm/hardware.h>
146 #include <asm/hardware/ioc.h>
147 #include <asm/io.h>
148 #include <asm/irq.h>
149 #include <asm/mach-types.h>
150 #include <asm/pgtable.h>
151 #include <asm/system.h>
152 #include <asm/uaccess.h>
153
154
155 #define MAJOR_NR FLOPPY_MAJOR
156 #define FLOPPY_DMA 0
157 #include <linux/blk.h>
158
159 /* Note: FD_MAX_UNITS could be redefined to 2 for the Atari (with
160 * little additional rework in this file). But I'm not yet sure if
161 * some other code depends on the number of floppies... (It is defined
162 * in a public header!)
163 */
164 #if 0
165 #undef FD_MAX_UNITS
166 #define FD_MAX_UNITS 2
167 #endif
168
169 /* Ditto worries for Arc - DAG */
170 #define FD_MAX_UNITS 4
171 #define TRACKBUFFER 0
172 /*#define DEBUG*/
173
174 #ifdef DEBUG
175 #define DPRINT(a) printk a
176 #else
177 #define DPRINT(a)
178 #endif
179
180 /* Disk types: DD */
181 static struct archy_disk_type {
182 const char *name;
183 unsigned spt; /* sectors per track */
184 unsigned blocks; /* total number of blocks */
185 unsigned stretch; /* track doubling ? */
186 } disk_type[] = {
187
188 { "d360", 9, 720, 0 }, /* 360kB diskette */
189 { "D360", 9, 720, 1 }, /* 360kb in 720kb drive */
190 { "D720", 9, 1440, 0 }, /* 720kb diskette (DD) */
191 /*{ "D820", 10,1640, 0}, *//* DD disk with 82 tracks/10 sectors
192 - DAG - can't see how type detect can distinguish this
193 from 720K until it reads block 4 by which time its too late! */
194 };
195
196 #define NUM_DISK_TYPES (sizeof(disk_type)/sizeof(*disk_type))
197
198 /*
199 * Maximum disk size (in kilobytes). This default is used whenever the
200 * current disk size is unknown.
201 */
202 #define MAX_DISK_SIZE 720
203
204 static int floppy_sizes[256];
205 static int floppy_blocksizes[256];
206
207 /* current info on each unit */
208 static struct archy_floppy_struct {
209 int connected; /* !=0 : drive is connected */
210 int autoprobe; /* !=0 : do autoprobe */
211
212 struct archy_disk_type *disktype; /* current type of disk */
213
214 int track; /* current head position or -1
215 * if unknown */
216 unsigned int steprate; /* steprate setting */
217 unsigned int wpstat; /* current state of WP signal
218 * (for disk change detection) */
219 } unit[FD_MAX_UNITS];
220
221 /* DAG: On Arc we spin on a flag being cleared by fdc1772_comendhandler which
222 is an assembler routine */
223 extern void fdc1772_comendhandler(void); /* Actually doens't have these parameters - see fd1772.S */
224 extern volatile int fdc1772_comendstatus;
225 extern volatile int fdc1772_fdc_int_done;
226
227 #define FDC1772BASE ((0x210000>>2)|0x80000000)
228
229 #define FDC1772_READ(reg) inb(FDC1772BASE+(reg/2))
230
231 /* DAG: You wouldn't be silly to ask why FDC1772_WRITE is a function rather
232 than the #def below - well simple - the #def won't compile - and I
233 don't understand why (__outwc not defined) */
234 /* NOTE: Reg is 0,2,4,6 as opposed to 0,1,2,3 or 0,4,8,12 to keep compatibility
235 with the ST version of fd1772.h */
236 /*#define FDC1772_WRITE(reg,val) outw(val,(reg+FDC1772BASE)); */
FDC1772_WRITE(int reg,unsigned char val)237 void FDC1772_WRITE(int reg, unsigned char val)
238 {
239 if (reg == FDC1772REG_CMD) {
240 DPRINT(("FDC1772_WRITE new command 0x%x @ %d\n", val,jiffies));
241 if (fdc1772_fdc_int_done) {
242 DPRINT(("FDC1772_WRITE: Hmm fdc1772_fdc_int_done true - resetting\n"));
243 fdc1772_fdc_int_done = 0;
244 };
245 };
246 outb(val, (reg / 2) + FDC1772BASE);
247 };
248
249 #define FD1772_MAX_SECTORS 22
250
251 unsigned char *DMABuffer; /* buffer for writes */
252 /*static unsigned long PhysDMABuffer; *//* physical address */
253 /* DAG: On Arc we just go straight for the DMA buffer */
254 #define PhysDMABuffer DMABuffer
255
256 #ifdef TRACKBUFFER
257 unsigned char *TrackBuffer; /* buffer for reads */
258 #define PhysTrackBuffer TrackBuffer /* physical address */
259 static int BufferDrive, BufferSide, BufferTrack;
260 static int read_track; /* non-zero if we are reading whole tracks */
261
262 #define SECTOR_BUFFER(sec) (TrackBuffer + ((sec)-1)*512)
263 #define IS_BUFFERED(drive,side,track) \
264 (BufferDrive == (drive) && BufferSide == (side) && BufferTrack == (track))
265 #endif
266
267 /*
268 * These are global variables, as that's the easiest way to give
269 * information to interrupts. They are the data used for the current
270 * request.
271 */
272 static int SelectedDrive = 0;
273 static int ReqCmd, ReqBlock;
274 static int ReqSide, ReqTrack, ReqSector, ReqCnt;
275 static int HeadSettleFlag = 0;
276 static unsigned char *ReqData, *ReqBuffer;
277 static int MotorOn = 0, MotorOffTrys;
278
279 /* Synchronization of FDC1772 access. */
280 static volatile int fdc_busy = 0;
281 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
282
283
284 /* long req'd for set_bit --RR */
285 static unsigned long changed_floppies = 0xff, fake_change = 0;
286 #define CHECK_CHANGE_DELAY HZ/2
287
288 /* DAG - increased to 30*HZ - not sure if this is the correct thing to do */
289 #define FD_MOTOR_OFF_DELAY (10*HZ)
290 #define FD_MOTOR_OFF_MAXTRY (10*20)
291
292 #define FLOPPY_TIMEOUT (6*HZ)
293 #define RECALIBRATE_ERRORS 4 /* After this many errors the drive
294 * will be recalibrated. */
295 #define MAX_ERRORS 8 /* After this many errors the driver
296 * will give up. */
297
298 #define START_MOTOR_OFF_TIMER(delay) \
299 do { \
300 motor_off_timer.expires = jiffies + (delay); \
301 add_timer( &motor_off_timer ); \
302 MotorOffTrys = 0; \
303 } while(0)
304
305 #define START_CHECK_CHANGE_TIMER(delay) \
306 do { \
307 mod_timer(&fd_timer, jiffies + (delay)); \
308 } while(0)
309
310 #define START_TIMEOUT() \
311 do { \
312 mod_timer(&timeout_timer, jiffies+FLOPPY_TIMEOUT); \
313 } while(0)
314
315 #define STOP_TIMEOUT() \
316 do { \
317 del_timer( &timeout_timer ); \
318 } while(0)
319
320 #define ENABLE_IRQ() enable_irq(FIQ_FD1772+64);
321
322 #define DISABLE_IRQ() disable_irq(FIQ_FD1772+64);
323
324 static void fd1772_checkint(void);
325
326 struct tq_struct fd1772_tq =
327 { 0,0, (void *)fd1772_checkint, 0 };
328 /*
329 * The driver is trying to determine the correct media format
330 * while Probing is set. fd_rwsec_done() clears it after a
331 * successful access.
332 */
333 static int Probing = 0;
334
335 /* This flag is set when a dummy seek is necesary to make the WP
336 * status bit accessible.
337 */
338 static int NeedSeek = 0;
339
340
341 /***************************** Prototypes *****************************/
342
343 static void fd_select_side(int side);
344 static void fd_select_drive(int drive);
345 static void fd_deselect(void);
346 static void fd_motor_off_timer(unsigned long dummy);
347 static void check_change(unsigned long dummy);
348 static __inline__ void set_head_settle_flag(void);
349 static __inline__ int get_head_settle_flag(void);
350 static void floppy_irqconsequencehandler(void);
351 static void fd_error(void);
352 static void do_fd_action(int drive);
353 static void fd_calibrate(void);
354 static void fd_calibrate_done(int status);
355 static void fd_seek(void);
356 static void fd_seek_done(int status);
357 static void fd_rwsec(void);
358 #ifdef TRACKBUFFER
359 static void fd_readtrack_check( unsigned long dummy );
360 #endif
361 static void fd_rwsec_done(int status);
362 static void fd_times_out(unsigned long dummy);
363 static void finish_fdc(void);
364 static void finish_fdc_done(int dummy);
365 static void floppy_off(unsigned int nr);
366 static __inline__ void copy_buffer(void *from, void *to);
367 static void setup_req_params(int drive);
368 static void redo_fd_request(void);
369 static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int
370 cmd, unsigned long param);
371 static void fd_probe(int drive);
372 static int fd_test_drive_present(int drive);
373 static void config_types(void);
374 static int floppy_open(struct inode *inode, struct file *filp);
375 static int floppy_release(struct inode *inode, struct file *filp);
376
377 /************************* End of Prototypes **************************/
378
379 static struct timer_list motor_off_timer = {
380 function: fd_motor_off_timer,
381 };
382
383 #ifdef TRACKBUFFER
384 static struct timer_list readtrack_timer = {
385 function: fd_readtrack_check,
386 };
387 #endif
388
389 static struct timer_list timeout_timer = {
390 function: fd_times_out,
391 };
392
393 static struct timer_list fd_timer = {
394 function: check_change,
395 };
396
397 /* DAG: Haven't got a clue what this is? */
stdma_islocked(void)398 int stdma_islocked(void)
399 {
400 return 0;
401 };
402
403 /* Select the side to use. */
404
fd_select_side(int side)405 static void fd_select_side(int side)
406 {
407 oldlatch_aupdate(LATCHA_SIDESEL, side ? 0 : LATCHA_SIDESEL);
408 }
409
410
411 /* Select a drive, update the FDC1772's track register
412 */
413
fd_select_drive(int drive)414 static void fd_select_drive(int drive)
415 {
416 #ifdef DEBUG
417 printk("fd_select_drive:%d\n", drive);
418 #endif
419 /* Hmm - nowhere do we seem to turn the motor on - I'm going to do it here! */
420 oldlatch_aupdate(LATCHA_MOTOR | LATCHA_INUSE, 0);
421
422 if (drive == SelectedDrive)
423 return;
424
425 oldlatch_aupdate(LATCHA_FDSELALL, 0xf - (1 << drive));
426
427 /* restore track register to saved value */
428 FDC1772_WRITE(FDC1772REG_TRACK, unit[drive].track);
429 udelay(25);
430
431 SelectedDrive = drive;
432 }
433
434
435 /* Deselect both drives. */
436
fd_deselect(void)437 static void fd_deselect(void)
438 {
439 unsigned long flags;
440
441 DPRINT(("fd_deselect\n"));
442
443 oldlatch_aupdate(LATCHA_FDSELALL | LATCHA_MOTOR | LATCHA_INUSE, 0xf | LATCHA_MOTOR | LATCHA_INUSE);
444
445 SelectedDrive = -1;
446 }
447
448
449 /* This timer function deselects the drives when the FDC1772 switched the
450 * motor off. The deselection cannot happen earlier because the FDC1772
451 * counts the index signals, which arrive only if one drive is selected.
452 */
453
fd_motor_off_timer(unsigned long dummy)454 static void fd_motor_off_timer(unsigned long dummy)
455 {
456 unsigned long flags;
457 unsigned char status;
458 int delay;
459
460 del_timer(&motor_off_timer);
461
462 if (SelectedDrive < 0)
463 /* no drive selected, needn't deselect anyone */
464 return;
465
466 save_flags(flags);
467 cli();
468
469 if (fdc_busy) /* was stdma_islocked */
470 goto retry;
471
472 status = FDC1772_READ(FDC1772REG_STATUS);
473
474 if (!(status & 0x80)) {
475 /*
476 * motor already turned off by FDC1772 -> deselect drives
477 * In actual fact its this deselection which turns the motor
478 * off on the Arc, since the motor control is actually on
479 * Latch A
480 */
481 DPRINT(("fdc1772: deselecting in fd_motor_off_timer\n"));
482 fd_deselect();
483 MotorOn = 0;
484 restore_flags(flags);
485 return;
486 }
487 /* not yet off, try again */
488
489 retry:
490 restore_flags(flags);
491 /* Test again later; if tested too often, it seems there is no disk
492 * in the drive and the FDC1772 will leave the motor on forever (or,
493 * at least until a disk is inserted). So we'll test only twice
494 * per second from then on...
495 */
496 delay = (MotorOffTrys < FD_MOTOR_OFF_MAXTRY) ?
497 (++MotorOffTrys, HZ / 20) : HZ / 2;
498 START_MOTOR_OFF_TIMER(delay);
499 }
500
501
502 /* This function is repeatedly called to detect disk changes (as good
503 * as possible) and keep track of the current state of the write protection.
504 */
505
check_change(unsigned long dummy)506 static void check_change(unsigned long dummy)
507 {
508 static int drive = 0;
509
510 unsigned long flags;
511 int stat;
512
513 if (fdc_busy)
514 return; /* Don't start poking about if the fdc is busy */
515
516 return; /* let's just forget it for the mo DAG */
517
518 if (++drive > 1 || !unit[drive].connected)
519 drive = 0;
520
521 save_flags(flags);
522 cli();
523
524 if (!stdma_islocked()) {
525 stat = !!(FDC1772_READ(FDC1772REG_STATUS) & FDC1772STAT_WPROT);
526
527 /* The idea here is that if the write protect line has changed then
528 the disc must have changed */
529 if (stat != unit[drive].wpstat) {
530 DPRINT(("wpstat[%d] = %d\n", drive, stat));
531 unit[drive].wpstat = stat;
532 set_bit(drive, &changed_floppies);
533 }
534 }
535 restore_flags(flags);
536
537 START_CHECK_CHANGE_TIMER(CHECK_CHANGE_DELAY);
538 }
539
540
541 /* Handling of the Head Settling Flag: This flag should be set after each
542 * seek operation, because we don't use seeks with verify.
543 */
544
set_head_settle_flag(void)545 static __inline__ void set_head_settle_flag(void)
546 {
547 HeadSettleFlag = FDC1772CMDADD_E;
548 }
549
get_head_settle_flag(void)550 static __inline__ int get_head_settle_flag(void)
551 {
552 int tmp = HeadSettleFlag;
553 HeadSettleFlag = 0;
554 return (tmp);
555 }
556
557
558
559
560 /* General Interrupt Handling */
561
562 static void (*FloppyIRQHandler) (int status) = NULL;
563
floppy_irqconsequencehandler(void)564 static void floppy_irqconsequencehandler(void)
565 {
566 unsigned char status;
567 void (*handler) (int);
568
569 fdc1772_fdc_int_done = 0;
570
571 handler = FloppyIRQHandler;
572 FloppyIRQHandler = NULL;
573
574 if (handler) {
575 nop();
576 status = (unsigned char) fdc1772_comendstatus;
577 DPRINT(("FDC1772 irq, status = %02x handler = %08lx\n", (unsigned int) status, (unsigned long) handler));
578 handler(status);
579 } else {
580 DPRINT(("FDC1772 irq, no handler status=%02x\n", fdc1772_comendstatus));
581 }
582 DPRINT(("FDC1772 irq: end of floppy_irq\n"));
583 }
584
585
586 /* Error handling: If some error happened, retry some times, then
587 * recalibrate, then try again, and fail after MAX_ERRORS.
588 */
589
fd_error(void)590 static void fd_error(void)
591 {
592 printk("FDC1772: fd_error\n");
593 /*panic("fd1772: fd_error"); *//* DAG tmp */
594 if (QUEUE_EMPTY)
595 return;
596 CURRENT->errors++;
597 if (CURRENT->errors >= MAX_ERRORS) {
598 printk("fd%d: too many errors.\n", SelectedDrive);
599 end_request(0);
600 } else if (CURRENT->errors == RECALIBRATE_ERRORS) {
601 printk("fd%d: recalibrating\n", SelectedDrive);
602 if (SelectedDrive != -1)
603 unit[SelectedDrive].track = -1;
604 }
605 redo_fd_request();
606 }
607
608
609
610 #define SET_IRQ_HANDLER(proc) do { FloppyIRQHandler = (proc); } while(0)
611
612
613 /* do_fd_action() is the general procedure for a fd request: All
614 * required parameter settings (drive select, side select, track
615 * position) are checked and set if needed. For each of these
616 * parameters and the actual reading or writing exist two functions:
617 * one that starts the setting (or skips it if possible) and one
618 * callback for the "done" interrupt. Each done func calls the next
619 * set function to propagate the request down to fd_rwsec_done().
620 */
621
do_fd_action(int drive)622 static void do_fd_action(int drive)
623 {
624 DPRINT(("do_fd_action unit[drive].track=%d\n", unit[drive].track));
625
626 #ifdef TRACKBUFFER
627 repeat:
628
629 if (IS_BUFFERED( drive, ReqSide, ReqTrack )) {
630 if (ReqCmd == READ) {
631 copy_buffer( SECTOR_BUFFER(ReqSector), ReqData );
632 if (++ReqCnt < CURRENT->current_nr_sectors) {
633 /* read next sector */
634 setup_req_params( drive );
635 goto repeat;
636 } else {
637 /* all sectors finished */
638 CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
639 CURRENT->sector += CURRENT->current_nr_sectors;
640 end_request( 1 );
641 redo_fd_request();
642 return;
643 }
644 } else {
645 /* cmd == WRITE, pay attention to track buffer
646 * consistency! */
647 copy_buffer( ReqData, SECTOR_BUFFER(ReqSector) );
648 }
649 }
650 #endif
651
652 if (SelectedDrive != drive) {
653 /*unit[drive].track = -1; DAG */
654 fd_select_drive(drive);
655 };
656
657
658 if (unit[drive].track == -1)
659 fd_calibrate();
660 else if (unit[drive].track != ReqTrack << unit[drive].disktype->stretch)
661 fd_seek();
662 else
663 fd_rwsec();
664 }
665
666
667 /* Seek to track 0 if the current track is unknown */
668
fd_calibrate(void)669 static void fd_calibrate(void)
670 {
671 DPRINT(("fd_calibrate\n"));
672 if (unit[SelectedDrive].track >= 0) {
673 fd_calibrate_done(0);
674 return;
675 }
676 DPRINT(("fd_calibrate (after track compare)\n"));
677 SET_IRQ_HANDLER(fd_calibrate_done);
678 /* we can't verify, since the speed may be incorrect */
679 FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_RESTORE | unit[SelectedDrive].steprate);
680
681 NeedSeek = 1;
682 MotorOn = 1;
683 START_TIMEOUT();
684 /* wait for IRQ */
685 }
686
687
fd_calibrate_done(int status)688 static void fd_calibrate_done(int status)
689 {
690 DPRINT(("fd_calibrate_done()\n"));
691 STOP_TIMEOUT();
692
693 /* set the correct speed now */
694 if (status & FDC1772STAT_RECNF) {
695 printk("fd%d: restore failed\n", SelectedDrive);
696 fd_error();
697 } else {
698 unit[SelectedDrive].track = 0;
699 fd_seek();
700 }
701 }
702
703
704 /* Seek the drive to the requested track. The drive must have been
705 * calibrated at some point before this.
706 */
707
fd_seek(void)708 static void fd_seek(void)
709 {
710 unsigned long flags;
711 DPRINT(("fd_seek() to track %d (unit[SelectedDrive].track=%d)\n", ReqTrack,
712 unit[SelectedDrive].track));
713 if (unit[SelectedDrive].track == ReqTrack <<
714 unit[SelectedDrive].disktype->stretch) {
715 fd_seek_done(0);
716 return;
717 }
718 FDC1772_WRITE(FDC1772REG_DATA, ReqTrack <<
719 unit[SelectedDrive].disktype->stretch);
720 udelay(25);
721 save_flags(flags);
722 clf();
723 SET_IRQ_HANDLER(fd_seek_done);
724 FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_SEEK | unit[SelectedDrive].steprate |
725 /* DAG */
726 (MotorOn?FDC1772CMDADD_H:0));
727
728 restore_flags(flags);
729 MotorOn = 1;
730 set_head_settle_flag();
731 START_TIMEOUT();
732 /* wait for IRQ */
733 }
734
735
fd_seek_done(int status)736 static void fd_seek_done(int status)
737 {
738 DPRINT(("fd_seek_done()\n"));
739 STOP_TIMEOUT();
740
741 /* set the correct speed */
742 if (status & FDC1772STAT_RECNF) {
743 printk("fd%d: seek error (to track %d)\n",
744 SelectedDrive, ReqTrack);
745 /* we don't know exactly which track we are on now! */
746 unit[SelectedDrive].track = -1;
747 fd_error();
748 } else {
749 unit[SelectedDrive].track = ReqTrack <<
750 unit[SelectedDrive].disktype->stretch;
751 NeedSeek = 0;
752 fd_rwsec();
753 }
754 }
755
756
757 /* This does the actual reading/writing after positioning the head
758 * over the correct track.
759 */
760
761 #ifdef TRACKBUFFER
762 static int MultReadInProgress = 0;
763 #endif
764
765
fd_rwsec(void)766 static void fd_rwsec(void)
767 {
768 unsigned long paddr, flags;
769 unsigned int rwflag, old_motoron;
770 unsigned int track;
771
772 DPRINT(("fd_rwsec(), Sec=%d, Access=%c\n", ReqSector, ReqCmd == WRITE ? 'w' : 'r'));
773 if (ReqCmd == WRITE) {
774 /*cache_push( (unsigned long)ReqData, 512 ); */
775 paddr = (unsigned long) ReqData;
776 rwflag = 0x100;
777 } else {
778 paddr = (unsigned long) PhysDMABuffer;
779 #ifdef TRACKBUFFER
780 if (read_track)
781 paddr = (unsigned long)PhysTrackBuffer;
782 #endif
783 rwflag = 0;
784 }
785
786 DPRINT(("fd_rwsec() before sidesel rwflag=%d sec=%d trk=%d\n", rwflag,
787 ReqSector, FDC1772_READ(FDC1772REG_TRACK)));
788 fd_select_side(ReqSide);
789
790 /*DPRINT(("fd_rwsec() before start sector \n")); */
791 /* Start sector of this operation */
792 #ifdef TRACKBUFFER
793 FDC1772_WRITE( FDC1772REG_SECTOR, !read_track ? ReqSector : 1 );
794 #else
795 FDC1772_WRITE( FDC1772REG_SECTOR, ReqSector );
796 #endif
797
798 /* Cheat for track if stretch != 0 */
799 if (unit[SelectedDrive].disktype->stretch) {
800 track = FDC1772_READ(FDC1772REG_TRACK);
801 FDC1772_WRITE(FDC1772REG_TRACK, track >>
802 unit[SelectedDrive].disktype->stretch);
803 }
804 udelay(25);
805
806 DPRINT(("fd_rwsec() before setup DMA \n"));
807 /* Setup DMA - Heavily modified by DAG */
808 save_flags(flags);
809 clf();
810 disable_dma(FLOPPY_DMA);
811 set_dma_mode(FLOPPY_DMA, rwflag ? DMA_MODE_WRITE : DMA_MODE_READ);
812 set_dma_addr(FLOPPY_DMA, (long) paddr); /* DAG - changed from Atari specific */
813 #ifdef TRACKBUFFER
814 set_dma_count(FLOPPY_DMA,(!read_track ? 1 : unit[SelectedDrive].disktype->spt)*512);
815 #else
816 set_dma_count(FLOPPY_DMA, 512); /* Block/sector size - going to have to change */
817 #endif
818 SET_IRQ_HANDLER(fd_rwsec_done);
819 /* Turn on dma int */
820 enable_dma(FLOPPY_DMA);
821 /* Now give it something to do */
822 FDC1772_WRITE(FDC1772REG_CMD, (rwflag ? (FDC1772CMD_WRSEC | FDC1772CMDADD_P) :
823 #ifdef TRACKBUFFER
824 (FDC1772CMD_RDSEC | (read_track ? FDC1772CMDADD_M : 0) |
825 /* Hmm - the idea here is to stop the FDC spinning the disc
826 up when we know that we already still have it spinning */
827 (MotorOn?FDC1772CMDADD_H:0))
828 #else
829 FDC1772CMD_RDSEC
830 #endif
831 ));
832
833 restore_flags(flags);
834 DPRINT(("fd_rwsec() after DMA setup flags=0x%08x\n", flags));
835 /*sti(); *//* DAG - Hmm */
836 /* Hmm - should do something DAG */
837 old_motoron = MotorOn;
838 MotorOn = 1;
839 NeedSeek = 1;
840
841 /* wait for interrupt */
842
843 #ifdef TRACKBUFFER
844 if (read_track) {
845 /*
846 * If reading a whole track, wait about one disk rotation and
847 * then check if all sectors are read. The FDC will even
848 * search for the first non-existant sector and need 1 sec to
849 * recognise that it isn't present :-(
850 */
851 /* 1 rot. + 5 rot.s if motor was off */
852 mod_timer(&readtrack_timer, jiffies + HZ/5 + (old_motoron ? 0 : HZ));
853 DPRINT(("Setting readtrack_timer to %d @ %d\n",
854 readtrack_timer.expires,jiffies));
855 MultReadInProgress = 1;
856 }
857 #endif
858
859 /*DPRINT(("fd_rwsec() before START_TIMEOUT \n")); */
860 START_TIMEOUT();
861 /*DPRINT(("fd_rwsec() after START_TIMEOUT \n")); */
862 }
863
864
865 #ifdef TRACKBUFFER
866
fd_readtrack_check(unsigned long dummy)867 static void fd_readtrack_check(unsigned long dummy)
868 {
869 unsigned long flags, addr;
870 extern unsigned char *fdc1772_dataaddr;
871
872 DPRINT(("fd_readtrack_check @ %d\n",jiffies));
873
874 save_flags(flags);
875 clf();
876
877 del_timer( &readtrack_timer );
878
879 if (!MultReadInProgress) {
880 /* This prevents a race condition that could arise if the
881 * interrupt is triggered while the calling of this timer
882 * callback function takes place. The IRQ function then has
883 * already cleared 'MultReadInProgress' when control flow
884 * gets here.
885 */
886 restore_flags(flags);
887 return;
888 }
889
890 /* get the current DMA address */
891 addr=(unsigned long)fdc1772_dataaddr; /* DAG - ? */
892 DPRINT(("fd_readtrack_check: addr=%x PhysTrackBuffer=%x\n",addr,PhysTrackBuffer));
893
894 if (addr >= (unsigned int)PhysTrackBuffer + unit[SelectedDrive].disktype->spt*512) {
895 /* already read enough data, force an FDC interrupt to stop
896 * the read operation
897 */
898 SET_IRQ_HANDLER( NULL );
899 restore_flags(flags);
900 DPRINT(("fd_readtrack_check(): done\n"));
901 FDC1772_WRITE( FDC1772REG_CMD, FDC1772CMD_FORCI );
902 udelay(25);
903
904 /* No error until now -- the FDC would have interrupted
905 * otherwise!
906 */
907 fd_rwsec_done( 0 );
908 } else {
909 /* not yet finished, wait another tenth rotation */
910 restore_flags(flags);
911 DPRINT(("fd_readtrack_check(): not yet finished\n"));
912 readtrack_timer.expires = jiffies + HZ/5/10;
913 add_timer( &readtrack_timer );
914 }
915 }
916
917 #endif
918
fd_rwsec_done(int status)919 static void fd_rwsec_done(int status)
920 {
921 unsigned int track;
922
923 DPRINT(("fd_rwsec_done() status=%d @ %d\n", status,jiffies));
924
925 #ifdef TRACKBUFFER
926 if (read_track && !MultReadInProgress)
927 return;
928
929 MultReadInProgress = 0;
930
931 STOP_TIMEOUT();
932
933 if (read_track)
934 del_timer( &readtrack_timer );
935 #endif
936
937
938 /* Correct the track if stretch != 0 */
939 if (unit[SelectedDrive].disktype->stretch) {
940 track = FDC1772_READ(FDC1772REG_TRACK);
941 FDC1772_WRITE(FDC1772REG_TRACK, track <<
942 unit[SelectedDrive].disktype->stretch);
943 }
944 if (ReqCmd == WRITE && (status & FDC1772STAT_WPROT)) {
945 printk("fd%d: is write protected\n", SelectedDrive);
946 goto err_end;
947 }
948 if ((status & FDC1772STAT_RECNF)
949 #ifdef TRACKBUFFER
950 /* RECNF is no error after a multiple read when the FDC
951 * searched for a non-existant sector!
952 */
953 && !(read_track &&
954 FDC1772_READ(FDC1772REG_SECTOR) > unit[SelectedDrive].disktype->spt)
955 #endif
956 ) {
957 if (Probing) {
958 if (unit[SelectedDrive].disktype > disk_type) {
959 /* try another disk type */
960 unit[SelectedDrive].disktype--;
961 floppy_sizes[SelectedDrive]
962 = unit[SelectedDrive].disktype->blocks >> 1;
963 } else
964 Probing = 0;
965 } else {
966 /* record not found, but not probing. Maybe stretch wrong ? Restart probing */
967 if (unit[SelectedDrive].autoprobe) {
968 unit[SelectedDrive].disktype = disk_type + NUM_DISK_TYPES - 1;
969 floppy_sizes[SelectedDrive]
970 = unit[SelectedDrive].disktype->blocks >> 1;
971 Probing = 1;
972 }
973 }
974 if (Probing) {
975 setup_req_params(SelectedDrive);
976 #ifdef TRACKBUFFER
977 BufferDrive = -1;
978 #endif
979 do_fd_action(SelectedDrive);
980 return;
981 }
982 printk("fd%d: sector %d not found (side %d, track %d)\n",
983 SelectedDrive, FDC1772_READ(FDC1772REG_SECTOR), ReqSide, ReqTrack);
984 goto err_end;
985 }
986 if (status & FDC1772STAT_CRC) {
987 printk("fd%d: CRC error (side %d, track %d, sector %d)\n",
988 SelectedDrive, ReqSide, ReqTrack, FDC1772_READ(FDC1772REG_SECTOR));
989 goto err_end;
990 }
991 if (status & FDC1772STAT_LOST) {
992 printk("fd%d: lost data (side %d, track %d, sector %d)\n",
993 SelectedDrive, ReqSide, ReqTrack, FDC1772_READ(FDC1772REG_SECTOR));
994 goto err_end;
995 }
996 Probing = 0;
997
998 if (ReqCmd == READ) {
999 #ifdef TRACKBUFFER
1000 if (!read_track) {
1001 /*cache_clear (PhysDMABuffer, 512);*/
1002 copy_buffer (DMABuffer, ReqData);
1003 } else {
1004 /*cache_clear (PhysTrackBuffer, FD1772_MAX_SECTORS * 512);*/
1005 BufferDrive = SelectedDrive;
1006 BufferSide = ReqSide;
1007 BufferTrack = ReqTrack;
1008 copy_buffer (SECTOR_BUFFER (ReqSector), ReqData);
1009 }
1010 #else
1011 /*cache_clear( PhysDMABuffer, 512 ); */
1012 copy_buffer(DMABuffer, ReqData);
1013 #endif
1014 }
1015 if (++ReqCnt < CURRENT->current_nr_sectors) {
1016 /* read next sector */
1017 setup_req_params(SelectedDrive);
1018 do_fd_action(SelectedDrive);
1019 } else {
1020 /* all sectors finished */
1021 CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
1022 CURRENT->sector += CURRENT->current_nr_sectors;
1023 end_request(1);
1024 redo_fd_request();
1025 }
1026 return;
1027
1028 err_end:
1029 #ifdef TRACKBUFFER
1030 BufferDrive = -1;
1031 #endif
1032
1033 fd_error();
1034 }
1035
1036
fd_times_out(unsigned long dummy)1037 static void fd_times_out(unsigned long dummy)
1038 {
1039 SET_IRQ_HANDLER(NULL);
1040 /* If the timeout occurred while the readtrack_check timer was
1041 * active, we need to cancel it, else bad things will happen */
1042 del_timer( &readtrack_timer );
1043 FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_FORCI);
1044 udelay(25);
1045
1046 printk("floppy timeout\n");
1047 STOP_TIMEOUT(); /* hmm - should we do this ? */
1048 fd_error();
1049 }
1050
1051
1052 /* The (noop) seek operation here is needed to make the WP bit in the
1053 * FDC1772 status register accessible for check_change. If the last disk
1054 * operation would have been a RDSEC, this bit would always read as 0
1055 * no matter what :-( To save time, the seek goes to the track we're
1056 * already on.
1057 */
1058
finish_fdc(void)1059 static void finish_fdc(void)
1060 {
1061 /* DAG - just try without this dummy seek! */
1062 finish_fdc_done(0);
1063 return;
1064
1065 if (!NeedSeek) {
1066 finish_fdc_done(0);
1067 } else {
1068 DPRINT(("finish_fdc: dummy seek started\n"));
1069 FDC1772_WRITE(FDC1772REG_DATA, unit[SelectedDrive].track);
1070 SET_IRQ_HANDLER(finish_fdc_done);
1071 FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_SEEK);
1072 MotorOn = 1;
1073 START_TIMEOUT();
1074 /* we must wait for the IRQ here, because the ST-DMA is
1075 * released immediatly afterwards and the interrupt may be
1076 * delivered to the wrong driver.
1077 */
1078 }
1079 }
1080
1081
finish_fdc_done(int dummy)1082 static void finish_fdc_done(int dummy)
1083 {
1084 unsigned long flags;
1085
1086 DPRINT(("finish_fdc_done entered\n"));
1087 STOP_TIMEOUT();
1088 NeedSeek = 0;
1089
1090 if (timer_pending(&fd_timer) &&
1091 time_after(jiffies + 5, fd_timer.expires))
1092 /* If the check for a disk change is done too early after this
1093 * last seek command, the WP bit still reads wrong :-((
1094 */
1095 mod_timer(&fd_timer, jiffies + 5);
1096 else {
1097 /* START_CHECK_CHANGE_TIMER( CHECK_CHANGE_DELAY ); */
1098 };
1099 del_timer(&motor_off_timer);
1100 START_MOTOR_OFF_TIMER(FD_MOTOR_OFF_DELAY);
1101
1102 save_flags(flags);
1103 cli();
1104 /* stdma_release(); - not sure if I should do something DAG */
1105 fdc_busy = 0;
1106 wake_up(&fdc_wait);
1107 restore_flags(flags);
1108
1109 DPRINT(("finish_fdc() finished\n"));
1110 }
1111
1112
1113 /* Prevent "aliased" accesses. */
1114 static int fd_ref[4];
1115 static int fd_device[4];
1116
1117 /*
1118 * Current device number. Taken either from the block header or from the
1119 * format request descriptor.
1120 */
1121 #define CURRENT_DEVICE (CURRENT->rq_dev)
1122
1123 /* Current error count. */
1124 #define CURRENT_ERRORS (CURRENT->errors)
1125
1126
1127 /* dummy for blk.h */
floppy_off(unsigned int nr)1128 static void floppy_off(unsigned int nr)
1129 {
1130 }
1131
1132
1133 /* On the old arcs write protect depends on the particular model
1134 of machine. On the A310, R140, and A440 there is a disc changed
1135 detect, however on the A4x0/1 range there is not. There
1136 is nothing to tell you which machine your on.
1137 At the moment I'm just marking changed always. I've
1138 left the Atari's 'change on write protect change' code in this
1139 part (but nothing sets it).
1140 RiscOS apparently checks the disc serial number etc. to detect changes
1141 - but if it sees a disc change line go high (?) it flips to using
1142 it. Well maybe I'll add that in the future (!?)
1143 */
check_floppy_change(dev_t dev)1144 static int check_floppy_change(dev_t dev)
1145 {
1146 unsigned int drive = (dev & 0x03);
1147
1148 if (MAJOR(dev) != MAJOR_NR) {
1149 printk("floppy_changed: not a floppy\n");
1150 return 0;
1151 }
1152 if (test_bit(drive, &fake_change)) {
1153 /* simulated change (e.g. after formatting) */
1154 return 1;
1155 }
1156 if (test_bit(drive, &changed_floppies)) {
1157 /* surely changed (the WP signal changed at least once) */
1158 return 1;
1159 }
1160 if (unit[drive].wpstat) {
1161 /* WP is on -> could be changed: to be sure, buffers should be
1162 * invalidated...
1163 */
1164 return 1;
1165 }
1166 return 1; /* DAG - was 0 */
1167 }
1168
floppy_revalidate(dev_t dev)1169 static int floppy_revalidate(dev_t dev)
1170 {
1171 int drive = dev & 3;
1172
1173 if (test_bit(drive, &changed_floppies) || test_bit(drive, &fake_change)
1174 || unit[drive].disktype == 0) {
1175 #ifdef TRACKBUFFER
1176 BufferDrive = -1;
1177 #endif
1178 clear_bit(drive, &fake_change);
1179 clear_bit(drive, &changed_floppies);
1180 unit[drive].disktype = 0;
1181 }
1182 return 0;
1183 }
1184
copy_buffer(void * from,void * to)1185 static __inline__ void copy_buffer(void *from, void *to)
1186 {
1187 ulong *p1 = (ulong *) from, *p2 = (ulong *) to;
1188 int cnt;
1189
1190 for (cnt = 512 / 4; cnt; cnt--)
1191 *p2++ = *p1++;
1192 }
1193
1194
1195 /* This sets up the global variables describing the current request. */
1196
setup_req_params(int drive)1197 static void setup_req_params(int drive)
1198 {
1199 int block = ReqBlock + ReqCnt;
1200
1201 ReqTrack = block / unit[drive].disktype->spt;
1202 ReqSector = block - ReqTrack * unit[drive].disktype->spt + 1;
1203 ReqSide = ReqTrack & 1;
1204 ReqTrack >>= 1;
1205 ReqData = ReqBuffer + 512 * ReqCnt;
1206
1207 #ifdef TRACKBUFFER
1208 read_track = (ReqCmd == READ && CURRENT_ERRORS == 0);
1209 #endif
1210
1211 DPRINT(("Request params: Si=%d Tr=%d Se=%d Data=%08lx\n", ReqSide,
1212 ReqTrack, ReqSector, (unsigned long) ReqData));
1213 }
1214
1215
redo_fd_request(void)1216 static void redo_fd_request(void)
1217 {
1218 int device, drive, type;
1219 struct archy_floppy_struct *floppy;
1220
1221 DPRINT(("redo_fd_request: CURRENT=%08lx CURRENT->rq_dev=%04x CURRENT->sector=%ld\n",
1222 (unsigned long) CURRENT, CURRENT ? CURRENT->rq_dev : 0,
1223 !QUEUE_EMPTY ? CURRENT->sector : 0));
1224
1225 if (!QUEUE_EMPTY && CURRENT->rq_status == RQ_INACTIVE)
1226 goto the_end;
1227
1228 repeat:
1229
1230 if (QUEUE_EMPTY)
1231 goto the_end;
1232
1233 if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
1234 panic(DEVICE_NAME ": request list destroyed");
1235
1236 if (CURRENT->bh) {
1237 if (!buffer_locked(CURRENT->bh))
1238 panic(DEVICE_NAME ": block not locked");
1239 }
1240 device = MINOR(CURRENT_DEVICE);
1241 drive = device & 3;
1242 type = device >> 2;
1243 floppy = &unit[drive];
1244
1245 if (!floppy->connected) {
1246 /* drive not connected */
1247 printk("Unknown Device: fd%d\n", drive);
1248 end_request(0);
1249 goto repeat;
1250 }
1251 if (type == 0) {
1252 if (!floppy->disktype) {
1253 Probing = 1;
1254 floppy->disktype = disk_type + NUM_DISK_TYPES - 1;
1255 floppy_sizes[drive] = floppy->disktype->blocks >> 1;
1256 floppy->autoprobe = 1;
1257 }
1258 } else {
1259 /* user supplied disk type */
1260 --type;
1261 if (type >= NUM_DISK_TYPES) {
1262 printk("fd%d: invalid disk format", drive);
1263 end_request(0);
1264 goto repeat;
1265 }
1266 floppy->disktype = &disk_type[type];
1267 floppy_sizes[drive] = disk_type[type].blocks >> 1;
1268 floppy->autoprobe = 0;
1269 }
1270
1271 if (CURRENT->sector + 1 > floppy->disktype->blocks) {
1272 end_request(0);
1273 goto repeat;
1274 }
1275 /* stop deselect timer */
1276 del_timer(&motor_off_timer);
1277
1278 ReqCnt = 0;
1279 ReqCmd = CURRENT->cmd;
1280 ReqBlock = CURRENT->sector;
1281 ReqBuffer = CURRENT->buffer;
1282 setup_req_params(drive);
1283 do_fd_action(drive);
1284
1285 return;
1286
1287 the_end:
1288 finish_fdc();
1289 }
1290
fd1772_checkint(void)1291 static void fd1772_checkint(void)
1292 {
1293 extern int fdc1772_bytestogo;
1294
1295 /*printk("fd1772_checkint %d\n",fdc1772_fdc_int_done);*/
1296 if (fdc1772_fdc_int_done)
1297 floppy_irqconsequencehandler();
1298 if ((MultReadInProgress) && (fdc1772_bytestogo==0)) fd_readtrack_check(0);
1299 if (fdc_busy) {
1300 queue_task(&fd1772_tq,&tq_immediate);
1301 mark_bh(IMMEDIATE_BH);
1302 }
1303 }
1304
do_fd_request(request_queue_t * q)1305 void do_fd_request(request_queue_t* q)
1306 {
1307 unsigned long flags;
1308
1309 DPRINT(("do_fd_request for pid %d\n", current->pid));
1310 if (fdc_busy) return;
1311 save_flags(flags);
1312 cli();
1313 while (fdc_busy)
1314 sleep_on(&fdc_wait);
1315 fdc_busy = 1;
1316 ENABLE_IRQ();
1317 restore_flags(flags);
1318
1319 fdc1772_fdc_int_done = 0;
1320
1321 redo_fd_request();
1322
1323 queue_task(&fd1772_tq,&tq_immediate);
1324 mark_bh(IMMEDIATE_BH);
1325 }
1326
1327
invalidate_drive(int rdev)1328 static int invalidate_drive(int rdev)
1329 {
1330 /* invalidate the buffer track to force a reread */
1331 #ifdef TRACKBUFFER
1332 BufferDrive = -1;
1333 #endif
1334
1335 set_bit(rdev & 3, &fake_change);
1336 check_disk_change(rdev);
1337 return 0;
1338 }
1339
fd_ioctl(struct inode * inode,struct file * filp,unsigned int cmd,unsigned long param)1340 static int fd_ioctl(struct inode *inode, struct file *filp,
1341 unsigned int cmd, unsigned long param)
1342 {
1343 int drive, device;
1344
1345 device = inode->i_rdev;
1346 drive = MINOR(device);
1347 switch (cmd) {
1348 case FDFMTBEG:
1349 return 0;
1350 /* case FDC1772LRPRM: ??? DAG what does this do??
1351 unit[drive].disktype = NULL;
1352 floppy_sizes[drive] = MAX_DISK_SIZE;
1353 return invalidate_drive (device); */
1354 case FDFMTEND:
1355 case FDFLUSH:
1356 return invalidate_drive(drive);
1357 }
1358 if (!capable(CAP_SYS_ADMIN))
1359 return -EPERM;
1360 if (drive < 0 || drive > 3)
1361 return -EINVAL;
1362 switch (cmd) {
1363 default:
1364 return -EINVAL;
1365 }
1366 return 0;
1367 }
1368
1369
1370 /* Initialize the 'unit' variable for drive 'drive' */
1371
fd_probe(int drive)1372 static void fd_probe(int drive)
1373 {
1374 unit[drive].connected = 0;
1375 unit[drive].disktype = NULL;
1376
1377 if (!fd_test_drive_present(drive))
1378 return;
1379
1380 unit[drive].connected = 1;
1381 unit[drive].track = -1; /* If we put the auto detect back in this can go to 0 */
1382 unit[drive].steprate = FDC1772STEP_6;
1383 MotorOn = 1; /* from probe restore operation! */
1384 }
1385
1386
1387 /* This function tests the physical presence of a floppy drive (not
1388 * whether a disk is inserted). This is done by issuing a restore
1389 * command, waiting max. 2 seconds (that should be enough to move the
1390 * head across the whole disk) and looking at the state of the "TR00"
1391 * signal. This should now be raised if there is a drive connected
1392 * (and there is no hardware failure :-) Otherwise, the drive is
1393 * declared absent.
1394 */
1395
fd_test_drive_present(int drive)1396 static int fd_test_drive_present(int drive)
1397 {
1398 unsigned long timeout;
1399 unsigned char status;
1400 int ok;
1401
1402 printk("fd_test_drive_present %d\n", drive);
1403 if (drive > 1)
1404 return (0);
1405 return (1); /* Simple hack for the moment - the autodetect doesn't seem to work on arc */
1406 fd_select_drive(drive);
1407
1408 /* disable interrupt temporarily */
1409 DISABLE_IRQ();
1410 FDC1772_WRITE(FDC1772REG_TRACK, 0x00); /* was ff00 why? */
1411 FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_RESTORE | FDC1772CMDADD_H | FDC1772STEP_6);
1412
1413 /*printk("fd_test_drive_present: Going into timeout loop\n"); */
1414 for (ok = 0, timeout = jiffies + 2 * HZ + HZ / 2; time_before(jiffies, timeout);) {
1415 /* What does this piece of atariism do? - query for an interrupt? */
1416 /* if (!(mfp.par_dt_reg & 0x20))
1417 break; */
1418 /* Well this is my nearest guess - quit when we get an FDC interrupt */
1419 if (ioc_readb(IOC_FIQSTAT) & 2)
1420 break;
1421 }
1422
1423 /*printk("fd_test_drive_present: Coming out of timeout loop\n"); */
1424 status = FDC1772_READ(FDC1772REG_STATUS);
1425 ok = (status & FDC1772STAT_TR00) != 0;
1426
1427 /*printk("fd_test_drive_present: ok=%d\n",ok); */
1428 /* force interrupt to abort restore operation (FDC1772 would try
1429 * about 50 seconds!) */
1430 FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_FORCI);
1431 udelay(500);
1432 status = FDC1772_READ(FDC1772REG_STATUS);
1433 udelay(20);
1434 /*printk("fd_test_drive_present: just before OK code %d\n",ok); */
1435
1436 if (ok) {
1437 /* dummy seek command to make WP bit accessible */
1438 FDC1772_WRITE(FDC1772REG_DATA, 0);
1439 FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_SEEK);
1440 printk("fd_test_drive_present: just before wait for int\n");
1441 /* DAG: Guess means wait for interrupt */
1442 while (!(ioc_readb(IOC_FIQSTAT) & 2));
1443 printk("fd_test_drive_present: just after wait for int\n");
1444 status = FDC1772_READ(FDC1772REG_STATUS);
1445 }
1446 printk("fd_test_drive_present: just before ENABLE_IRQ\n");
1447 ENABLE_IRQ();
1448 printk("fd_test_drive_present: about to return\n");
1449 return (ok);
1450 }
1451
1452
1453 /* Look how many and which kind of drives are connected. If there are
1454 * floppies, additionally start the disk-change and motor-off timers.
1455 */
1456
config_types(void)1457 static void config_types(void)
1458 {
1459 int drive, cnt = 0;
1460
1461 printk("Probing floppy drive(s):\n");
1462 for (drive = 0; drive < FD_MAX_UNITS; drive++) {
1463 fd_probe(drive);
1464 if (unit[drive].connected) {
1465 printk("fd%d\n", drive);
1466 ++cnt;
1467 }
1468 }
1469
1470 if (FDC1772_READ(FDC1772REG_STATUS) & FDC1772STAT_BUSY) {
1471 /* If FDC1772 is still busy from probing, give it another FORCI
1472 * command to abort the operation. If this isn't done, the FDC1772
1473 * will interrupt later and its IRQ line stays low, because
1474 * the status register isn't read. And this will block any
1475 * interrupts on this IRQ line :-(
1476 */
1477 FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_FORCI);
1478 udelay(500);
1479 FDC1772_READ(FDC1772REG_STATUS);
1480 udelay(20);
1481 }
1482 if (cnt > 0) {
1483 START_MOTOR_OFF_TIMER(FD_MOTOR_OFF_DELAY);
1484 if (cnt == 1)
1485 fd_select_drive(0);
1486 /*START_CHECK_CHANGE_TIMER( CHECK_CHANGE_DELAY ); */
1487 }
1488 }
1489
1490 /*
1491 * floppy_open check for aliasing (/dev/fd0 can be the same as
1492 * /dev/PS0 etc), and disallows simultaneous access to the same
1493 * drive with different device numbers.
1494 */
1495
floppy_open(struct inode * inode,struct file * filp)1496 static int floppy_open(struct inode *inode, struct file *filp)
1497 {
1498 int drive;
1499 int old_dev;
1500
1501 if (!filp) {
1502 DPRINT(("Weird, open called with filp=0\n"));
1503 return -EIO;
1504 }
1505 drive = MINOR(inode->i_rdev) & 3;
1506 if ((MINOR(inode->i_rdev) >> 2) > NUM_DISK_TYPES)
1507 return -ENXIO;
1508
1509 old_dev = fd_device[drive];
1510
1511 if (fd_ref[drive])
1512 if (old_dev != inode->i_rdev)
1513 return -EBUSY;
1514
1515 if (fd_ref[drive] == -1 || (fd_ref[drive] && filp->f_flags & O_EXCL))
1516 return -EBUSY;
1517
1518 if (filp->f_flags & O_EXCL)
1519 fd_ref[drive] = -1;
1520 else
1521 fd_ref[drive]++;
1522
1523 fd_device[drive] = inode->i_rdev;
1524
1525 if (old_dev && old_dev != inode->i_rdev)
1526 invalidate_buffers(old_dev);
1527
1528 if (filp->f_flags & O_NDELAY)
1529 return 0;
1530
1531 if (filp->f_mode & 3) {
1532 check_disk_change(inode->i_rdev);
1533 if (filp->f_mode & 2) {
1534 if (unit[drive].wpstat) {
1535 floppy_release(inode, filp);
1536 return -EROFS;
1537 }
1538 }
1539 }
1540 return 0;
1541 }
1542
1543
floppy_release(struct inode * inode,struct file * filp)1544 static int floppy_release(struct inode *inode, struct file *filp)
1545 {
1546 int drive = MINOR(inode->i_rdev) & 3;
1547
1548 if (fd_ref[drive] < 0)
1549 fd_ref[drive] = 0;
1550 else if (!fd_ref[drive]--) {
1551 printk("floppy_release with fd_ref == 0");
1552 fd_ref[drive] = 0;
1553 }
1554
1555 return 0;
1556 }
1557
1558 static struct block_device_operations floppy_fops =
1559 {
1560 open: floppy_open,
1561 release: floppy_release,
1562 ioctl: fd_ioctl,
1563 check_media_change: check_floppy_change,
1564 revalidate: floppy_revalidate,
1565 };
1566
1567
fd1772_init(void)1568 int fd1772_init(void)
1569 {
1570 int i, err;
1571
1572 if (!machine_is_archimedes())
1573 return 0;
1574
1575 err = register_blkdev(MAJOR_NR, "fd", &floppy_fops);
1576 if (err) {
1577 printk("Unable to get major %d for floppy\n", MAJOR_NR);
1578 goto err_out;
1579 }
1580
1581 err = -EBUSY;
1582 if (request_dma(FLOPPY_DMA, "fd1772")) {
1583 printk("Unable to grab DMA%d for the floppy (1772) driver\n", FLOPPY_DMA);
1584 goto err_blkdev;
1585 };
1586
1587 if (request_dma(FIQ_FD1772, "fd1772 end")) {
1588 printk("Unable to grab DMA%d for the floppy (1772) driver\n", FIQ_FD1772);
1589 goto err_dma1;
1590 };
1591
1592 /* initialize variables */
1593 err = -ENOMEM;
1594 SelectedDrive = -1;
1595 #ifdef TRACKBUFFER
1596 BufferDrive = BufferSide = BufferTrack = -1;
1597 /* Atari uses 512 - I want to eventually cope with 1K sectors */
1598 DMABuffer = (char *)kmalloc((FD1772_MAX_SECTORS+1)*512,GFP_KERNEL);
1599 TrackBuffer = DMABuffer + 512;
1600 #else
1601 /* Allocate memory for the DMAbuffer - on the Atari this takes it
1602 out of some special memory... */
1603 DMABuffer = (char *) kmalloc(2048); /* Copes with pretty large sectors */
1604 #endif
1605 if (DMABuffer == NULL)
1606 goto err_dma2;
1607
1608 enable_dma(FIQ_FD1772); /* This inserts a call to our command end routine */
1609 for (i = 0; i < FD_MAX_UNITS; i++) {
1610 unit[i].track = -1;
1611 }
1612
1613 for (i = 0; i < 256; i++)
1614 if ((i >> 2) > 0 && (i >> 2) <= NUM_DISK_TYPES)
1615 floppy_sizes[i] = disk_type[(i >> 2) - 1].blocks >> 1;
1616 else
1617 floppy_sizes[i] = MAX_DISK_SIZE;
1618
1619 blk_size[MAJOR_NR] = floppy_sizes;
1620 blksize_size[MAJOR_NR] = floppy_blocksizes;
1621 blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
1622
1623 config_types();
1624
1625 return 0;
1626
1627 err_dma2:
1628 free_dma(FIQ_FD1772);
1629 err_dma1:
1630 free_dma(FLOPPY_DMA);
1631 err_blkdev:
1632 unregister_blkdev(MAJOR_NR, &floppy_fops);
1633 err_out:
1634 return err;
1635 }
1636