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1 /*
2 * linux/amiga/amiflop.c
3 *
4 * Copyright (C) 1993 Greg Harp
5 * Portions of this driver are based on code contributed by Brad Pepers
6 *
7 * revised 28.5.95 by Joerg Dorchain
8 * - now no bugs(?) any more for both HD & DD
9 * - added support for 40 Track 5.25" drives, 80-track hopefully behaves
10 * like 3.5" dd (no way to test - are there any 5.25" drives out there
11 * that work on an A4000?)
12 * - wrote formatting routine (maybe dirty, but works)
13 *
14 * june/july 1995 added ms-dos support by Joerg Dorchain
15 * (portions based on messydos.device and various contributors)
16 * - currently only 9 and 18 sector disks
17 *
18 * - fixed a bug with the internal trackbuffer when using multiple
19 * disks the same time
20 * - made formatting a bit safer
21 * - added command line and machine based default for "silent" df0
22 *
23 * december 1995 adapted for 1.2.13pl4 by Joerg Dorchain
24 * - works but I think it's inefficient. (look in redo_fd_request)
25 * But the changes were very efficient. (only three and a half lines)
26 *
27 * january 1996 added special ioctl for tracking down read/write problems
28 * - usage ioctl(d, RAW_TRACK, ptr); the raw track buffer (MFM-encoded data
29 * is copied to area. (area should be large enough since no checking is
30 * done - 30K is currently sufficient). return the actual size of the
31 * trackbuffer
32 * - replaced udelays() by a timer (CIAA timer B) for the waits
33 * needed for the disk mechanic.
34 *
35 * february 1996 fixed error recovery and multiple disk access
36 * - both got broken the first time I tampered with the driver :-(
37 * - still not safe, but better than before
38 *
39 * revised Marts 3rd, 1996 by Jes Sorensen for use in the 1.3.28 kernel.
40 * - Minor changes to accept the kdev_t.
41 * - Replaced some more udelays with ms_delays. Udelay is just a loop,
42 * and so the delay will be different depending on the given
43 * processor :-(
44 * - The driver could use a major cleanup because of the new
45 * major/minor handling that came with kdev_t. It seems to work for
46 * the time being, but I can't guarantee that it will stay like
47 * that when we start using 16 (24?) bit minors.
48 *
49 * restructured jan 1997 by Joerg Dorchain
50 * - Fixed Bug accessing multiple disks
51 * - some code cleanup
52 * - added trackbuffer for each drive to speed things up
53 * - fixed some race conditions (who finds the next may send it to me ;-)
54 */
55
56 #include <linux/module.h>
57 #include <linux/slab.h>
58
59 #include <linux/fd.h>
60 #include <linux/hdreg.h>
61 #include <linux/delay.h>
62 #include <linux/init.h>
63 #include <linux/mutex.h>
64 #include <linux/fs.h>
65 #include <linux/blk-mq.h>
66 #include <linux/elevator.h>
67 #include <linux/interrupt.h>
68 #include <linux/platform_device.h>
69
70 #include <asm/setup.h>
71 #include <linux/uaccess.h>
72 #include <asm/amigahw.h>
73 #include <asm/amigaints.h>
74 #include <asm/irq.h>
75
76 #undef DEBUG /* print _LOTS_ of infos */
77
78 #define RAW_IOCTL
79 #ifdef RAW_IOCTL
80 #define IOCTL_RAW_TRACK 0x5254524B /* 'RTRK' */
81 #endif
82
83 /*
84 * Defines
85 */
86
87 /*
88 * CIAAPRA bits (read only)
89 */
90
91 #define DSKRDY (0x1<<5) /* disk ready when low */
92 #define DSKTRACK0 (0x1<<4) /* head at track zero when low */
93 #define DSKPROT (0x1<<3) /* disk protected when low */
94 #define DSKCHANGE (0x1<<2) /* low when disk removed */
95
96 /*
97 * CIAAPRB bits (read/write)
98 */
99
100 #define DSKMOTOR (0x1<<7) /* motor on when low */
101 #define DSKSEL3 (0x1<<6) /* select drive 3 when low */
102 #define DSKSEL2 (0x1<<5) /* select drive 2 when low */
103 #define DSKSEL1 (0x1<<4) /* select drive 1 when low */
104 #define DSKSEL0 (0x1<<3) /* select drive 0 when low */
105 #define DSKSIDE (0x1<<2) /* side selection: 0 = upper, 1 = lower */
106 #define DSKDIREC (0x1<<1) /* step direction: 0=in, 1=out (to trk 0) */
107 #define DSKSTEP (0x1) /* pulse low to step head 1 track */
108
109 /*
110 * DSKBYTR bits (read only)
111 */
112
113 #define DSKBYT (1<<15) /* register contains valid byte when set */
114 #define DMAON (1<<14) /* disk DMA enabled */
115 #define DISKWRITE (1<<13) /* disk write bit in DSKLEN enabled */
116 #define WORDEQUAL (1<<12) /* DSKSYNC register match when true */
117 /* bits 7-0 are data */
118
119 /*
120 * ADKCON/ADKCONR bits
121 */
122
123 #ifndef SETCLR
124 #define ADK_SETCLR (1<<15) /* control bit */
125 #endif
126 #define ADK_PRECOMP1 (1<<14) /* precompensation selection */
127 #define ADK_PRECOMP0 (1<<13) /* 00=none, 01=140ns, 10=280ns, 11=500ns */
128 #define ADK_MFMPREC (1<<12) /* 0=GCR precomp., 1=MFM precomp. */
129 #define ADK_WORDSYNC (1<<10) /* enable DSKSYNC auto DMA */
130 #define ADK_MSBSYNC (1<<9) /* when 1, enable sync on MSbit (for GCR) */
131 #define ADK_FAST (1<<8) /* bit cell: 0=2us (GCR), 1=1us (MFM) */
132
133 /*
134 * DSKLEN bits
135 */
136
137 #define DSKLEN_DMAEN (1<<15)
138 #define DSKLEN_WRITE (1<<14)
139
140 /*
141 * INTENA/INTREQ bits
142 */
143
144 #define DSKINDEX (0x1<<4) /* DSKINDEX bit */
145
146 /*
147 * Misc
148 */
149
150 #define MFM_SYNC 0x4489 /* standard MFM sync value */
151
152 /* Values for FD_COMMAND */
153 #define FD_RECALIBRATE 0x07 /* move to track 0 */
154 #define FD_SEEK 0x0F /* seek track */
155 #define FD_READ 0xE6 /* read with MT, MFM, SKip deleted */
156 #define FD_WRITE 0xC5 /* write with MT, MFM */
157 #define FD_SENSEI 0x08 /* Sense Interrupt Status */
158 #define FD_SPECIFY 0x03 /* specify HUT etc */
159 #define FD_FORMAT 0x4D /* format one track */
160 #define FD_VERSION 0x10 /* get version code */
161 #define FD_CONFIGURE 0x13 /* configure FIFO operation */
162 #define FD_PERPENDICULAR 0x12 /* perpendicular r/w mode */
163
164 #define FD_MAX_UNITS 4 /* Max. Number of drives */
165 #define FLOPPY_MAX_SECTORS 22 /* Max. Number of sectors per track */
166
167 struct fd_data_type {
168 char *name; /* description of data type */
169 int sects; /* sectors per track */
170 int (*read_fkt)(int); /* read whole track */
171 void (*write_fkt)(int); /* write whole track */
172 };
173
174 struct fd_drive_type {
175 unsigned long code; /* code returned from drive */
176 char *name; /* description of drive */
177 unsigned int tracks; /* number of tracks */
178 unsigned int heads; /* number of heads */
179 unsigned int read_size; /* raw read size for one track */
180 unsigned int write_size; /* raw write size for one track */
181 unsigned int sect_mult; /* sectors and gap multiplier (HD = 2) */
182 unsigned int precomp1; /* start track for precomp 1 */
183 unsigned int precomp2; /* start track for precomp 2 */
184 unsigned int step_delay; /* time (in ms) for delay after step */
185 unsigned int settle_time; /* time to settle after dir change */
186 unsigned int side_time; /* time needed to change sides */
187 };
188
189 struct amiga_floppy_struct {
190 struct fd_drive_type *type; /* type of floppy for this unit */
191 struct fd_data_type *dtype; /* type of floppy for this unit */
192 int track; /* current track (-1 == unknown) */
193 unsigned char *trackbuf; /* current track (kmaloc()'d */
194
195 int blocks; /* total # blocks on disk */
196
197 int changed; /* true when not known */
198 int disk; /* disk in drive (-1 == unknown) */
199 int motor; /* true when motor is at speed */
200 int busy; /* true when drive is active */
201 int dirty; /* true when trackbuf is not on disk */
202 int status; /* current error code for unit */
203 struct gendisk *gendisk;
204 struct blk_mq_tag_set tag_set;
205 };
206
207 /*
208 * Error codes
209 */
210 #define FD_OK 0 /* operation succeeded */
211 #define FD_ERROR -1 /* general error (seek, read, write, etc) */
212 #define FD_NOUNIT 1 /* unit does not exist */
213 #define FD_UNITBUSY 2 /* unit already active */
214 #define FD_NOTACTIVE 3 /* unit is not active */
215 #define FD_NOTREADY 4 /* unit is not ready (motor not on/no disk) */
216
217 #define MFM_NOSYNC 1
218 #define MFM_HEADER 2
219 #define MFM_DATA 3
220 #define MFM_TRACK 4
221
222 /*
223 * Floppy ID values
224 */
225 #define FD_NODRIVE 0x00000000 /* response when no unit is present */
226 #define FD_DD_3 0xffffffff /* double-density 3.5" (880K) drive */
227 #define FD_HD_3 0x55555555 /* high-density 3.5" (1760K) drive */
228 #define FD_DD_5 0xaaaaaaaa /* double-density 5.25" (440K) drive */
229
230 static DEFINE_MUTEX(amiflop_mutex);
231 static unsigned long int fd_def_df0 = FD_DD_3; /* default for df0 if it doesn't identify */
232
233 module_param(fd_def_df0, ulong, 0);
234 MODULE_LICENSE("GPL");
235
236 /*
237 * Macros
238 */
239 #define MOTOR_ON (ciab.prb &= ~DSKMOTOR)
240 #define MOTOR_OFF (ciab.prb |= DSKMOTOR)
241 #define SELECT(mask) (ciab.prb &= ~mask)
242 #define DESELECT(mask) (ciab.prb |= mask)
243 #define SELMASK(drive) (1 << (3 + (drive & 3)))
244
245 static struct fd_drive_type drive_types[] = {
246 /* code name tr he rdsz wrsz sm pc1 pc2 sd st st*/
247 /* warning: times are now in milliseconds (ms) */
248 { FD_DD_3, "DD 3.5", 80, 2, 14716, 13630, 1, 80,161, 3, 18, 1},
249 { FD_HD_3, "HD 3.5", 80, 2, 28344, 27258, 2, 80,161, 3, 18, 1},
250 { FD_DD_5, "DD 5.25", 40, 2, 14716, 13630, 1, 40, 81, 6, 30, 2},
251 { FD_NODRIVE, "No Drive", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
252 };
253 static int num_dr_types = ARRAY_SIZE(drive_types);
254
255 static int amiga_read(int), dos_read(int);
256 static void amiga_write(int), dos_write(int);
257 static struct fd_data_type data_types[] = {
258 { "Amiga", 11 , amiga_read, amiga_write},
259 { "MS-Dos", 9, dos_read, dos_write}
260 };
261
262 /* current info on each unit */
263 static struct amiga_floppy_struct unit[FD_MAX_UNITS];
264
265 static struct timer_list flush_track_timer[FD_MAX_UNITS];
266 static struct timer_list post_write_timer;
267 static unsigned long post_write_timer_drive;
268 static struct timer_list motor_on_timer;
269 static struct timer_list motor_off_timer[FD_MAX_UNITS];
270 static int on_attempts;
271
272 /* Synchronization of FDC access */
273 /* request loop (trackbuffer) */
274 static volatile int fdc_busy = -1;
275 static volatile int fdc_nested;
276 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
277
278 static DECLARE_COMPLETION(motor_on_completion);
279
280 static volatile int selected = -1; /* currently selected drive */
281
282 static int writepending;
283 static int writefromint;
284 static char *raw_buf;
285
286 static DEFINE_SPINLOCK(amiflop_lock);
287
288 #define RAW_BUF_SIZE 30000 /* size of raw disk data */
289
290 /*
291 * These are global variables, as that's the easiest way to give
292 * information to interrupts. They are the data used for the current
293 * request.
294 */
295 static volatile char block_flag;
296 static DECLARE_WAIT_QUEUE_HEAD(wait_fd_block);
297
298 /* MS-Dos MFM Coding tables (should go quick and easy) */
299 static unsigned char mfmencode[16]={
300 0x2a, 0x29, 0x24, 0x25, 0x12, 0x11, 0x14, 0x15,
301 0x4a, 0x49, 0x44, 0x45, 0x52, 0x51, 0x54, 0x55
302 };
303 static unsigned char mfmdecode[128];
304
305 /* floppy internal millisecond timer stuff */
306 static DECLARE_COMPLETION(ms_wait_completion);
307 #define MS_TICKS ((amiga_eclock+50)/1000)
308
309 /*
310 * Note that MAX_ERRORS=X doesn't imply that we retry every bad read
311 * max X times - some types of errors increase the errorcount by 2 or
312 * even 3, so we might actually retry only X/2 times before giving up.
313 */
314 #define MAX_ERRORS 12
315
316 #define custom amiga_custom
317
318 /* Prevent "aliased" accesses. */
319 static int fd_ref[4] = { 0,0,0,0 };
320 static int fd_device[4] = { 0, 0, 0, 0 };
321
322 /*
323 * Here come the actual hardware access and helper functions.
324 * They are not reentrant and single threaded because all drives
325 * share the same hardware and the same trackbuffer.
326 */
327
328 /* Milliseconds timer */
329
330 static irqreturn_t ms_isr(int irq, void *dummy)
331 {
332 complete(&ms_wait_completion);
333 return IRQ_HANDLED;
334 }
335
336 /* all waits are queued up
337 A more generic routine would do a schedule a la timer.device */
338 static void ms_delay(int ms)
339 {
340 int ticks;
341 static DEFINE_MUTEX(mutex);
342
343 if (ms > 0) {
344 mutex_lock(&mutex);
345 ticks = MS_TICKS*ms-1;
346 ciaa.tblo=ticks%256;
347 ciaa.tbhi=ticks/256;
348 ciaa.crb=0x19; /*count eclock, force load, one-shoot, start */
349 wait_for_completion(&ms_wait_completion);
350 mutex_unlock(&mutex);
351 }
352 }
353
354 /* Hardware semaphore */
355
356 /* returns true when we would get the semaphore */
357 static inline int try_fdc(int drive)
358 {
359 drive &= 3;
360 return ((fdc_busy < 0) || (fdc_busy == drive));
361 }
362
363 static void get_fdc(int drive)
364 {
365 unsigned long flags;
366
367 drive &= 3;
368 #ifdef DEBUG
369 printk("get_fdc: drive %d fdc_busy %d fdc_nested %d\n",drive,fdc_busy,fdc_nested);
370 #endif
371 local_irq_save(flags);
372 wait_event(fdc_wait, try_fdc(drive));
373 fdc_busy = drive;
374 fdc_nested++;
375 local_irq_restore(flags);
376 }
377
378 static inline void rel_fdc(void)
379 {
380 #ifdef DEBUG
381 if (fdc_nested == 0)
382 printk("fd: unmatched rel_fdc\n");
383 printk("rel_fdc: fdc_busy %d fdc_nested %d\n",fdc_busy,fdc_nested);
384 #endif
385 fdc_nested--;
386 if (fdc_nested == 0) {
387 fdc_busy = -1;
388 wake_up(&fdc_wait);
389 }
390 }
391
392 static void fd_select (int drive)
393 {
394 unsigned char prb = ~0;
395
396 drive&=3;
397 #ifdef DEBUG
398 printk("selecting %d\n",drive);
399 #endif
400 if (drive == selected)
401 return;
402 get_fdc(drive);
403 selected = drive;
404
405 if (unit[drive].track % 2 != 0)
406 prb &= ~DSKSIDE;
407 if (unit[drive].motor == 1)
408 prb &= ~DSKMOTOR;
409 ciab.prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
410 ciab.prb = prb;
411 prb &= ~SELMASK(drive);
412 ciab.prb = prb;
413 rel_fdc();
414 }
415
416 static void fd_deselect (int drive)
417 {
418 unsigned char prb;
419 unsigned long flags;
420
421 drive&=3;
422 #ifdef DEBUG
423 printk("deselecting %d\n",drive);
424 #endif
425 if (drive != selected) {
426 printk(KERN_WARNING "Deselecting drive %d while %d was selected!\n",drive,selected);
427 return;
428 }
429
430 get_fdc(drive);
431 local_irq_save(flags);
432
433 selected = -1;
434
435 prb = ciab.prb;
436 prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
437 ciab.prb = prb;
438
439 local_irq_restore (flags);
440 rel_fdc();
441
442 }
443
444 static void motor_on_callback(struct timer_list *unused)
445 {
446 if (!(ciaa.pra & DSKRDY) || --on_attempts == 0) {
447 complete_all(&motor_on_completion);
448 } else {
449 motor_on_timer.expires = jiffies + HZ/10;
450 add_timer(&motor_on_timer);
451 }
452 }
453
454 static int fd_motor_on(int nr)
455 {
456 nr &= 3;
457
458 del_timer(motor_off_timer + nr);
459
460 if (!unit[nr].motor) {
461 unit[nr].motor = 1;
462 fd_select(nr);
463
464 reinit_completion(&motor_on_completion);
465 mod_timer(&motor_on_timer, jiffies + HZ/2);
466
467 on_attempts = 10;
468 wait_for_completion(&motor_on_completion);
469 fd_deselect(nr);
470 }
471
472 if (on_attempts == 0) {
473 on_attempts = -1;
474 #if 0
475 printk (KERN_ERR "motor_on failed, turning motor off\n");
476 fd_motor_off (motor_off_timer + nr);
477 return 0;
478 #else
479 printk (KERN_WARNING "DSKRDY not set after 1.5 seconds - assuming drive is spinning notwithstanding\n");
480 #endif
481 }
482
483 return 1;
484 }
485
486 static void fd_motor_off(struct timer_list *timer)
487 {
488 unsigned long drive = ((unsigned long)timer -
489 (unsigned long)&motor_off_timer[0]) /
490 sizeof(motor_off_timer[0]);
491
492 drive&=3;
493 if (!try_fdc(drive)) {
494 /* We would be blocked in an interrupt, so try again later */
495 timer->expires = jiffies + 1;
496 add_timer(timer);
497 return;
498 }
499 unit[drive].motor = 0;
500 fd_select(drive);
501 udelay (1);
502 fd_deselect(drive);
503 }
504
505 static void floppy_off (unsigned int nr)
506 {
507 int drive;
508
509 drive = nr & 3;
510 mod_timer(motor_off_timer + drive, jiffies + 3*HZ);
511 }
512
513 static int fd_calibrate(int drive)
514 {
515 unsigned char prb;
516 int n;
517
518 drive &= 3;
519 get_fdc(drive);
520 if (!fd_motor_on (drive))
521 return 0;
522 fd_select (drive);
523 prb = ciab.prb;
524 prb |= DSKSIDE;
525 prb &= ~DSKDIREC;
526 ciab.prb = prb;
527 for (n = unit[drive].type->tracks/2; n != 0; --n) {
528 if (ciaa.pra & DSKTRACK0)
529 break;
530 prb &= ~DSKSTEP;
531 ciab.prb = prb;
532 prb |= DSKSTEP;
533 udelay (2);
534 ciab.prb = prb;
535 ms_delay(unit[drive].type->step_delay);
536 }
537 ms_delay (unit[drive].type->settle_time);
538 prb |= DSKDIREC;
539 n = unit[drive].type->tracks + 20;
540 for (;;) {
541 prb &= ~DSKSTEP;
542 ciab.prb = prb;
543 prb |= DSKSTEP;
544 udelay (2);
545 ciab.prb = prb;
546 ms_delay(unit[drive].type->step_delay + 1);
547 if ((ciaa.pra & DSKTRACK0) == 0)
548 break;
549 if (--n == 0) {
550 printk (KERN_ERR "fd%d: calibrate failed, turning motor off\n", drive);
551 fd_motor_off (motor_off_timer + drive);
552 unit[drive].track = -1;
553 rel_fdc();
554 return 0;
555 }
556 }
557 unit[drive].track = 0;
558 ms_delay(unit[drive].type->settle_time);
559
560 rel_fdc();
561 fd_deselect(drive);
562 return 1;
563 }
564
565 static int fd_seek(int drive, int track)
566 {
567 unsigned char prb;
568 int cnt;
569
570 #ifdef DEBUG
571 printk("seeking drive %d to track %d\n",drive,track);
572 #endif
573 drive &= 3;
574 get_fdc(drive);
575 if (unit[drive].track == track) {
576 rel_fdc();
577 return 1;
578 }
579 if (!fd_motor_on(drive)) {
580 rel_fdc();
581 return 0;
582 }
583 if (unit[drive].track < 0 && !fd_calibrate(drive)) {
584 rel_fdc();
585 return 0;
586 }
587
588 fd_select (drive);
589 cnt = unit[drive].track/2 - track/2;
590 prb = ciab.prb;
591 prb |= DSKSIDE | DSKDIREC;
592 if (track % 2 != 0)
593 prb &= ~DSKSIDE;
594 if (cnt < 0) {
595 cnt = - cnt;
596 prb &= ~DSKDIREC;
597 }
598 ciab.prb = prb;
599 if (track % 2 != unit[drive].track % 2)
600 ms_delay (unit[drive].type->side_time);
601 unit[drive].track = track;
602 if (cnt == 0) {
603 rel_fdc();
604 fd_deselect(drive);
605 return 1;
606 }
607 do {
608 prb &= ~DSKSTEP;
609 ciab.prb = prb;
610 prb |= DSKSTEP;
611 udelay (1);
612 ciab.prb = prb;
613 ms_delay (unit[drive].type->step_delay);
614 } while (--cnt != 0);
615 ms_delay (unit[drive].type->settle_time);
616
617 rel_fdc();
618 fd_deselect(drive);
619 return 1;
620 }
621
622 static unsigned long fd_get_drive_id(int drive)
623 {
624 int i;
625 ulong id = 0;
626
627 drive&=3;
628 get_fdc(drive);
629 /* set up for ID */
630 MOTOR_ON;
631 udelay(2);
632 SELECT(SELMASK(drive));
633 udelay(2);
634 DESELECT(SELMASK(drive));
635 udelay(2);
636 MOTOR_OFF;
637 udelay(2);
638 SELECT(SELMASK(drive));
639 udelay(2);
640 DESELECT(SELMASK(drive));
641 udelay(2);
642
643 /* loop and read disk ID */
644 for (i=0; i<32; i++) {
645 SELECT(SELMASK(drive));
646 udelay(2);
647
648 /* read and store value of DSKRDY */
649 id <<= 1;
650 id |= (ciaa.pra & DSKRDY) ? 0 : 1; /* cia regs are low-active! */
651
652 DESELECT(SELMASK(drive));
653 }
654
655 rel_fdc();
656
657 /*
658 * RB: At least A500/A2000's df0: don't identify themselves.
659 * As every (real) Amiga has at least a 3.5" DD drive as df0:
660 * we default to that if df0: doesn't identify as a certain
661 * type.
662 */
663 if(drive == 0 && id == FD_NODRIVE)
664 {
665 id = fd_def_df0;
666 printk(KERN_NOTICE "fd: drive 0 didn't identify, setting default %08lx\n", (ulong)fd_def_df0);
667 }
668 /* return the ID value */
669 return (id);
670 }
671
672 static irqreturn_t fd_block_done(int irq, void *dummy)
673 {
674 if (block_flag)
675 custom.dsklen = 0x4000;
676
677 if (block_flag == 2) { /* writing */
678 writepending = 2;
679 post_write_timer.expires = jiffies + 1; /* at least 2 ms */
680 post_write_timer_drive = selected;
681 add_timer(&post_write_timer);
682 }
683 else { /* reading */
684 block_flag = 0;
685 wake_up (&wait_fd_block);
686 }
687 return IRQ_HANDLED;
688 }
689
690 static void raw_read(int drive)
691 {
692 drive&=3;
693 get_fdc(drive);
694 wait_event(wait_fd_block, !block_flag);
695 fd_select(drive);
696 /* setup adkcon bits correctly */
697 custom.adkcon = ADK_MSBSYNC;
698 custom.adkcon = ADK_SETCLR|ADK_WORDSYNC|ADK_FAST;
699
700 custom.dsksync = MFM_SYNC;
701
702 custom.dsklen = 0;
703 custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf);
704 custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN;
705 custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN;
706
707 block_flag = 1;
708
709 wait_event(wait_fd_block, !block_flag);
710
711 custom.dsklen = 0;
712 fd_deselect(drive);
713 rel_fdc();
714 }
715
716 static int raw_write(int drive)
717 {
718 ushort adk;
719
720 drive&=3;
721 get_fdc(drive); /* corresponds to rel_fdc() in post_write() */
722 if ((ciaa.pra & DSKPROT) == 0) {
723 rel_fdc();
724 return 0;
725 }
726 wait_event(wait_fd_block, !block_flag);
727 fd_select(drive);
728 /* clear adkcon bits */
729 custom.adkcon = ADK_PRECOMP1|ADK_PRECOMP0|ADK_WORDSYNC|ADK_MSBSYNC;
730 /* set appropriate adkcon bits */
731 adk = ADK_SETCLR|ADK_FAST;
732 if ((ulong)unit[drive].track >= unit[drive].type->precomp2)
733 adk |= ADK_PRECOMP1;
734 else if ((ulong)unit[drive].track >= unit[drive].type->precomp1)
735 adk |= ADK_PRECOMP0;
736 custom.adkcon = adk;
737
738 custom.dsklen = DSKLEN_WRITE;
739 custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf);
740 custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE;
741 custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE;
742
743 block_flag = 2;
744 return 1;
745 }
746
747 /*
748 * to be called at least 2ms after the write has finished but before any
749 * other access to the hardware.
750 */
751 static void post_write (unsigned long drive)
752 {
753 #ifdef DEBUG
754 printk("post_write for drive %ld\n",drive);
755 #endif
756 drive &= 3;
757 custom.dsklen = 0;
758 block_flag = 0;
759 writepending = 0;
760 writefromint = 0;
761 unit[drive].dirty = 0;
762 wake_up(&wait_fd_block);
763 fd_deselect(drive);
764 rel_fdc(); /* corresponds to get_fdc() in raw_write */
765 }
766
767 static void post_write_callback(struct timer_list *timer)
768 {
769 post_write(post_write_timer_drive);
770 }
771
772 /*
773 * The following functions are to convert the block contents into raw data
774 * written to disk and vice versa.
775 * (Add other formats here ;-))
776 */
777
778 static unsigned long scan_sync(unsigned long raw, unsigned long end)
779 {
780 ushort *ptr = (ushort *)raw, *endp = (ushort *)end;
781
782 while (ptr < endp && *ptr++ != 0x4489)
783 ;
784 if (ptr < endp) {
785 while (*ptr == 0x4489 && ptr < endp)
786 ptr++;
787 return (ulong)ptr;
788 }
789 return 0;
790 }
791
792 static inline unsigned long checksum(unsigned long *addr, int len)
793 {
794 unsigned long csum = 0;
795
796 len /= sizeof(*addr);
797 while (len-- > 0)
798 csum ^= *addr++;
799 csum = ((csum>>1) & 0x55555555) ^ (csum & 0x55555555);
800
801 return csum;
802 }
803
804 static unsigned long decode (unsigned long *data, unsigned long *raw,
805 int len)
806 {
807 ulong *odd, *even;
808
809 /* convert length from bytes to longwords */
810 len >>= 2;
811 odd = raw;
812 even = odd + len;
813
814 /* prepare return pointer */
815 raw += len * 2;
816
817 do {
818 *data++ = ((*odd++ & 0x55555555) << 1) | (*even++ & 0x55555555);
819 } while (--len != 0);
820
821 return (ulong)raw;
822 }
823
824 struct header {
825 unsigned char magic;
826 unsigned char track;
827 unsigned char sect;
828 unsigned char ord;
829 unsigned char labels[16];
830 unsigned long hdrchk;
831 unsigned long datachk;
832 };
833
834 static int amiga_read(int drive)
835 {
836 unsigned long raw;
837 unsigned long end;
838 int scnt;
839 unsigned long csum;
840 struct header hdr;
841
842 drive&=3;
843 raw = (long) raw_buf;
844 end = raw + unit[drive].type->read_size;
845
846 for (scnt = 0;scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) {
847 if (!(raw = scan_sync(raw, end))) {
848 printk (KERN_INFO "can't find sync for sector %d\n", scnt);
849 return MFM_NOSYNC;
850 }
851
852 raw = decode ((ulong *)&hdr.magic, (ulong *)raw, 4);
853 raw = decode ((ulong *)&hdr.labels, (ulong *)raw, 16);
854 raw = decode ((ulong *)&hdr.hdrchk, (ulong *)raw, 4);
855 raw = decode ((ulong *)&hdr.datachk, (ulong *)raw, 4);
856 csum = checksum((ulong *)&hdr,
857 (char *)&hdr.hdrchk-(char *)&hdr);
858
859 #ifdef DEBUG
860 printk ("(%x,%d,%d,%d) (%lx,%lx,%lx,%lx) %lx %lx\n",
861 hdr.magic, hdr.track, hdr.sect, hdr.ord,
862 *(ulong *)&hdr.labels[0], *(ulong *)&hdr.labels[4],
863 *(ulong *)&hdr.labels[8], *(ulong *)&hdr.labels[12],
864 hdr.hdrchk, hdr.datachk);
865 #endif
866
867 if (hdr.hdrchk != csum) {
868 printk(KERN_INFO "MFM_HEADER: %08lx,%08lx\n", hdr.hdrchk, csum);
869 return MFM_HEADER;
870 }
871
872 /* verify track */
873 if (hdr.track != unit[drive].track) {
874 printk(KERN_INFO "MFM_TRACK: %d, %d\n", hdr.track, unit[drive].track);
875 return MFM_TRACK;
876 }
877
878 raw = decode ((ulong *)(unit[drive].trackbuf + hdr.sect*512),
879 (ulong *)raw, 512);
880 csum = checksum((ulong *)(unit[drive].trackbuf + hdr.sect*512), 512);
881
882 if (hdr.datachk != csum) {
883 printk(KERN_INFO "MFM_DATA: (%x:%d:%d:%d) sc=%d %lx, %lx\n",
884 hdr.magic, hdr.track, hdr.sect, hdr.ord, scnt,
885 hdr.datachk, csum);
886 printk (KERN_INFO "data=(%lx,%lx,%lx,%lx)\n",
887 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[0],
888 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[1],
889 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[2],
890 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[3]);
891 return MFM_DATA;
892 }
893 }
894
895 return 0;
896 }
897
898 static void encode(unsigned long data, unsigned long *dest)
899 {
900 unsigned long data2;
901
902 data &= 0x55555555;
903 data2 = data ^ 0x55555555;
904 data |= ((data2 >> 1) | 0x80000000) & (data2 << 1);
905
906 if (*(dest - 1) & 0x00000001)
907 data &= 0x7FFFFFFF;
908
909 *dest = data;
910 }
911
912 static void encode_block(unsigned long *dest, unsigned long *src, int len)
913 {
914 int cnt, to_cnt = 0;
915 unsigned long data;
916
917 /* odd bits */
918 for (cnt = 0; cnt < len / 4; cnt++) {
919 data = src[cnt] >> 1;
920 encode(data, dest + to_cnt++);
921 }
922
923 /* even bits */
924 for (cnt = 0; cnt < len / 4; cnt++) {
925 data = src[cnt];
926 encode(data, dest + to_cnt++);
927 }
928 }
929
930 static unsigned long *putsec(int disk, unsigned long *raw, int cnt)
931 {
932 struct header hdr;
933 int i;
934
935 disk&=3;
936 *raw = (raw[-1]&1) ? 0x2AAAAAAA : 0xAAAAAAAA;
937 raw++;
938 *raw++ = 0x44894489;
939
940 hdr.magic = 0xFF;
941 hdr.track = unit[disk].track;
942 hdr.sect = cnt;
943 hdr.ord = unit[disk].dtype->sects * unit[disk].type->sect_mult - cnt;
944 for (i = 0; i < 16; i++)
945 hdr.labels[i] = 0;
946 hdr.hdrchk = checksum((ulong *)&hdr,
947 (char *)&hdr.hdrchk-(char *)&hdr);
948 hdr.datachk = checksum((ulong *)(unit[disk].trackbuf+cnt*512), 512);
949
950 encode_block(raw, (ulong *)&hdr.magic, 4);
951 raw += 2;
952 encode_block(raw, (ulong *)&hdr.labels, 16);
953 raw += 8;
954 encode_block(raw, (ulong *)&hdr.hdrchk, 4);
955 raw += 2;
956 encode_block(raw, (ulong *)&hdr.datachk, 4);
957 raw += 2;
958 encode_block(raw, (ulong *)(unit[disk].trackbuf+cnt*512), 512);
959 raw += 256;
960
961 return raw;
962 }
963
964 static void amiga_write(int disk)
965 {
966 unsigned int cnt;
967 unsigned long *ptr = (unsigned long *)raw_buf;
968
969 disk&=3;
970 /* gap space */
971 for (cnt = 0; cnt < 415 * unit[disk].type->sect_mult; cnt++)
972 *ptr++ = 0xaaaaaaaa;
973
974 /* sectors */
975 for (cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++)
976 ptr = putsec (disk, ptr, cnt);
977 *(ushort *)ptr = (ptr[-1]&1) ? 0x2AA8 : 0xAAA8;
978 }
979
980
981 struct dos_header {
982 unsigned char track, /* 0-80 */
983 side, /* 0-1 */
984 sec, /* 0-...*/
985 len_desc;/* 2 */
986 unsigned short crc; /* on 68000 we got an alignment problem,
987 but this compiler solves it by adding silently
988 adding a pad byte so data won't fit
989 and this took about 3h to discover.... */
990 unsigned char gap1[22]; /* for longword-alignedness (0x4e) */
991 };
992
993 /* crc routines are borrowed from the messydos-handler */
994
995 /* excerpt from the messydos-device
996 ; The CRC is computed not only over the actual data, but including
997 ; the SYNC mark (3 * $a1) and the 'ID/DATA - Address Mark' ($fe/$fb).
998 ; As we don't read or encode these fields into our buffers, we have to
999 ; preload the registers containing the CRC with the values they would have
1000 ; after stepping over these fields.
1001 ;
1002 ; How CRCs "really" work:
1003 ;
1004 ; First, you should regard a bitstring as a series of coefficients of
1005 ; polynomials. We calculate with these polynomials in modulo-2
1006 ; arithmetic, in which both add and subtract are done the same as
1007 ; exclusive-or. Now, we modify our data (a very long polynomial) in
1008 ; such a way that it becomes divisible by the CCITT-standard 16-bit
1009 ; 16 12 5
1010 ; polynomial: x + x + x + 1, represented by $11021. The easiest
1011 ; way to do this would be to multiply (using proper arithmetic) our
1012 ; datablock with $11021. So we have:
1013 ; data * $11021 =
1014 ; data * ($10000 + $1021) =
1015 ; data * $10000 + data * $1021
1016 ; The left part of this is simple: Just add two 0 bytes. But then
1017 ; the right part (data $1021) remains difficult and even could have
1018 ; a carry into the left part. The solution is to use a modified
1019 ; multiplication, which has a result that is not correct, but with
1020 ; a difference of any multiple of $11021. We then only need to keep
1021 ; the 16 least significant bits of the result.
1022 ;
1023 ; The following algorithm does this for us:
1024 ;
1025 ; unsigned char *data, c, crclo, crchi;
1026 ; while (not done) {
1027 ; c = *data++ + crchi;
1028 ; crchi = (@ c) >> 8 + crclo;
1029 ; crclo = @ c;
1030 ; }
1031 ;
1032 ; Remember, + is done with EOR, the @ operator is in two tables (high
1033 ; and low byte separately), which is calculated as
1034 ;
1035 ; $1021 * (c & $F0)
1036 ; xor $1021 * (c & $0F)
1037 ; xor $1021 * (c >> 4) (* is regular multiplication)
1038 ;
1039 ;
1040 ; Anyway, the end result is the same as the remainder of the division of
1041 ; the data by $11021. I am afraid I need to study theory a bit more...
1042
1043
1044 my only works was to code this from manx to C....
1045
1046 */
1047
1048 static ushort dos_crc(void * data_a3, int data_d0, int data_d1, int data_d3)
1049 {
1050 static unsigned char CRCTable1[] = {
1051 0x00,0x10,0x20,0x30,0x40,0x50,0x60,0x70,0x81,0x91,0xa1,0xb1,0xc1,0xd1,0xe1,0xf1,
1052 0x12,0x02,0x32,0x22,0x52,0x42,0x72,0x62,0x93,0x83,0xb3,0xa3,0xd3,0xc3,0xf3,0xe3,
1053 0x24,0x34,0x04,0x14,0x64,0x74,0x44,0x54,0xa5,0xb5,0x85,0x95,0xe5,0xf5,0xc5,0xd5,
1054 0x36,0x26,0x16,0x06,0x76,0x66,0x56,0x46,0xb7,0xa7,0x97,0x87,0xf7,0xe7,0xd7,0xc7,
1055 0x48,0x58,0x68,0x78,0x08,0x18,0x28,0x38,0xc9,0xd9,0xe9,0xf9,0x89,0x99,0xa9,0xb9,
1056 0x5a,0x4a,0x7a,0x6a,0x1a,0x0a,0x3a,0x2a,0xdb,0xcb,0xfb,0xeb,0x9b,0x8b,0xbb,0xab,
1057 0x6c,0x7c,0x4c,0x5c,0x2c,0x3c,0x0c,0x1c,0xed,0xfd,0xcd,0xdd,0xad,0xbd,0x8d,0x9d,
1058 0x7e,0x6e,0x5e,0x4e,0x3e,0x2e,0x1e,0x0e,0xff,0xef,0xdf,0xcf,0xbf,0xaf,0x9f,0x8f,
1059 0x91,0x81,0xb1,0xa1,0xd1,0xc1,0xf1,0xe1,0x10,0x00,0x30,0x20,0x50,0x40,0x70,0x60,
1060 0x83,0x93,0xa3,0xb3,0xc3,0xd3,0xe3,0xf3,0x02,0x12,0x22,0x32,0x42,0x52,0x62,0x72,
1061 0xb5,0xa5,0x95,0x85,0xf5,0xe5,0xd5,0xc5,0x34,0x24,0x14,0x04,0x74,0x64,0x54,0x44,
1062 0xa7,0xb7,0x87,0x97,0xe7,0xf7,0xc7,0xd7,0x26,0x36,0x06,0x16,0x66,0x76,0x46,0x56,
1063 0xd9,0xc9,0xf9,0xe9,0x99,0x89,0xb9,0xa9,0x58,0x48,0x78,0x68,0x18,0x08,0x38,0x28,
1064 0xcb,0xdb,0xeb,0xfb,0x8b,0x9b,0xab,0xbb,0x4a,0x5a,0x6a,0x7a,0x0a,0x1a,0x2a,0x3a,
1065 0xfd,0xed,0xdd,0xcd,0xbd,0xad,0x9d,0x8d,0x7c,0x6c,0x5c,0x4c,0x3c,0x2c,0x1c,0x0c,
1066 0xef,0xff,0xcf,0xdf,0xaf,0xbf,0x8f,0x9f,0x6e,0x7e,0x4e,0x5e,0x2e,0x3e,0x0e,0x1e
1067 };
1068
1069 static unsigned char CRCTable2[] = {
1070 0x00,0x21,0x42,0x63,0x84,0xa5,0xc6,0xe7,0x08,0x29,0x4a,0x6b,0x8c,0xad,0xce,0xef,
1071 0x31,0x10,0x73,0x52,0xb5,0x94,0xf7,0xd6,0x39,0x18,0x7b,0x5a,0xbd,0x9c,0xff,0xde,
1072 0x62,0x43,0x20,0x01,0xe6,0xc7,0xa4,0x85,0x6a,0x4b,0x28,0x09,0xee,0xcf,0xac,0x8d,
1073 0x53,0x72,0x11,0x30,0xd7,0xf6,0x95,0xb4,0x5b,0x7a,0x19,0x38,0xdf,0xfe,0x9d,0xbc,
1074 0xc4,0xe5,0x86,0xa7,0x40,0x61,0x02,0x23,0xcc,0xed,0x8e,0xaf,0x48,0x69,0x0a,0x2b,
1075 0xf5,0xd4,0xb7,0x96,0x71,0x50,0x33,0x12,0xfd,0xdc,0xbf,0x9e,0x79,0x58,0x3b,0x1a,
1076 0xa6,0x87,0xe4,0xc5,0x22,0x03,0x60,0x41,0xae,0x8f,0xec,0xcd,0x2a,0x0b,0x68,0x49,
1077 0x97,0xb6,0xd5,0xf4,0x13,0x32,0x51,0x70,0x9f,0xbe,0xdd,0xfc,0x1b,0x3a,0x59,0x78,
1078 0x88,0xa9,0xca,0xeb,0x0c,0x2d,0x4e,0x6f,0x80,0xa1,0xc2,0xe3,0x04,0x25,0x46,0x67,
1079 0xb9,0x98,0xfb,0xda,0x3d,0x1c,0x7f,0x5e,0xb1,0x90,0xf3,0xd2,0x35,0x14,0x77,0x56,
1080 0xea,0xcb,0xa8,0x89,0x6e,0x4f,0x2c,0x0d,0xe2,0xc3,0xa0,0x81,0x66,0x47,0x24,0x05,
1081 0xdb,0xfa,0x99,0xb8,0x5f,0x7e,0x1d,0x3c,0xd3,0xf2,0x91,0xb0,0x57,0x76,0x15,0x34,
1082 0x4c,0x6d,0x0e,0x2f,0xc8,0xe9,0x8a,0xab,0x44,0x65,0x06,0x27,0xc0,0xe1,0x82,0xa3,
1083 0x7d,0x5c,0x3f,0x1e,0xf9,0xd8,0xbb,0x9a,0x75,0x54,0x37,0x16,0xf1,0xd0,0xb3,0x92,
1084 0x2e,0x0f,0x6c,0x4d,0xaa,0x8b,0xe8,0xc9,0x26,0x07,0x64,0x45,0xa2,0x83,0xe0,0xc1,
1085 0x1f,0x3e,0x5d,0x7c,0x9b,0xba,0xd9,0xf8,0x17,0x36,0x55,0x74,0x93,0xb2,0xd1,0xf0
1086 };
1087
1088 /* look at the asm-code - what looks in C a bit strange is almost as good as handmade */
1089 register int i;
1090 register unsigned char *CRCT1, *CRCT2, *data, c, crch, crcl;
1091
1092 CRCT1=CRCTable1;
1093 CRCT2=CRCTable2;
1094 data=data_a3;
1095 crcl=data_d1;
1096 crch=data_d0;
1097 for (i=data_d3; i>=0; i--) {
1098 c = (*data++) ^ crch;
1099 crch = CRCT1[c] ^ crcl;
1100 crcl = CRCT2[c];
1101 }
1102 return (crch<<8)|crcl;
1103 }
1104
1105 static inline ushort dos_hdr_crc (struct dos_header *hdr)
1106 {
1107 return dos_crc(&(hdr->track), 0xb2, 0x30, 3); /* precomputed magic */
1108 }
1109
1110 static inline ushort dos_data_crc(unsigned char *data)
1111 {
1112 return dos_crc(data, 0xe2, 0x95 ,511); /* precomputed magic */
1113 }
1114
1115 static inline unsigned char dos_decode_byte(ushort word)
1116 {
1117 register ushort w2;
1118 register unsigned char byte;
1119 register unsigned char *dec = mfmdecode;
1120
1121 w2=word;
1122 w2>>=8;
1123 w2&=127;
1124 byte = dec[w2];
1125 byte <<= 4;
1126 w2 = word & 127;
1127 byte |= dec[w2];
1128 return byte;
1129 }
1130
1131 static unsigned long dos_decode(unsigned char *data, unsigned short *raw, int len)
1132 {
1133 int i;
1134
1135 for (i = 0; i < len; i++)
1136 *data++=dos_decode_byte(*raw++);
1137 return ((ulong)raw);
1138 }
1139
1140 #ifdef DEBUG
1141 static void dbg(unsigned long ptr)
1142 {
1143 printk("raw data @%08lx: %08lx, %08lx ,%08lx, %08lx\n", ptr,
1144 ((ulong *)ptr)[0], ((ulong *)ptr)[1],
1145 ((ulong *)ptr)[2], ((ulong *)ptr)[3]);
1146 }
1147 #endif
1148
1149 static int dos_read(int drive)
1150 {
1151 unsigned long end;
1152 unsigned long raw;
1153 int scnt;
1154 unsigned short crc,data_crc[2];
1155 struct dos_header hdr;
1156
1157 drive&=3;
1158 raw = (long) raw_buf;
1159 end = raw + unit[drive].type->read_size;
1160
1161 for (scnt=0; scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) {
1162 do { /* search for the right sync of each sec-hdr */
1163 if (!(raw = scan_sync (raw, end))) {
1164 printk(KERN_INFO "dos_read: no hdr sync on "
1165 "track %d, unit %d for sector %d\n",
1166 unit[drive].track,drive,scnt);
1167 return MFM_NOSYNC;
1168 }
1169 #ifdef DEBUG
1170 dbg(raw);
1171 #endif
1172 } while (*((ushort *)raw)!=0x5554); /* loop usually only once done */
1173 raw+=2; /* skip over headermark */
1174 raw = dos_decode((unsigned char *)&hdr,(ushort *) raw,8);
1175 crc = dos_hdr_crc(&hdr);
1176
1177 #ifdef DEBUG
1178 printk("(%3d,%d,%2d,%d) %x\n", hdr.track, hdr.side,
1179 hdr.sec, hdr.len_desc, hdr.crc);
1180 #endif
1181
1182 if (crc != hdr.crc) {
1183 printk(KERN_INFO "dos_read: MFM_HEADER %04x,%04x\n",
1184 hdr.crc, crc);
1185 return MFM_HEADER;
1186 }
1187 if (hdr.track != unit[drive].track/unit[drive].type->heads) {
1188 printk(KERN_INFO "dos_read: MFM_TRACK %d, %d\n",
1189 hdr.track,
1190 unit[drive].track/unit[drive].type->heads);
1191 return MFM_TRACK;
1192 }
1193
1194 if (hdr.side != unit[drive].track%unit[drive].type->heads) {
1195 printk(KERN_INFO "dos_read: MFM_SIDE %d, %d\n",
1196 hdr.side,
1197 unit[drive].track%unit[drive].type->heads);
1198 return MFM_TRACK;
1199 }
1200
1201 if (hdr.len_desc != 2) {
1202 printk(KERN_INFO "dos_read: unknown sector len "
1203 "descriptor %d\n", hdr.len_desc);
1204 return MFM_DATA;
1205 }
1206 #ifdef DEBUG
1207 printk("hdr accepted\n");
1208 #endif
1209 if (!(raw = scan_sync (raw, end))) {
1210 printk(KERN_INFO "dos_read: no data sync on track "
1211 "%d, unit %d for sector%d, disk sector %d\n",
1212 unit[drive].track, drive, scnt, hdr.sec);
1213 return MFM_NOSYNC;
1214 }
1215 #ifdef DEBUG
1216 dbg(raw);
1217 #endif
1218
1219 if (*((ushort *)raw)!=0x5545) {
1220 printk(KERN_INFO "dos_read: no data mark after "
1221 "sync (%d,%d,%d,%d) sc=%d\n",
1222 hdr.track,hdr.side,hdr.sec,hdr.len_desc,scnt);
1223 return MFM_NOSYNC;
1224 }
1225
1226 raw+=2; /* skip data mark (included in checksum) */
1227 raw = dos_decode((unsigned char *)(unit[drive].trackbuf + (hdr.sec - 1) * 512), (ushort *) raw, 512);
1228 raw = dos_decode((unsigned char *)data_crc,(ushort *) raw,4);
1229 crc = dos_data_crc(unit[drive].trackbuf + (hdr.sec - 1) * 512);
1230
1231 if (crc != data_crc[0]) {
1232 printk(KERN_INFO "dos_read: MFM_DATA (%d,%d,%d,%d) "
1233 "sc=%d, %x %x\n", hdr.track, hdr.side,
1234 hdr.sec, hdr.len_desc, scnt,data_crc[0], crc);
1235 printk(KERN_INFO "data=(%lx,%lx,%lx,%lx,...)\n",
1236 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[0],
1237 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[1],
1238 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[2],
1239 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[3]);
1240 return MFM_DATA;
1241 }
1242 }
1243 return 0;
1244 }
1245
1246 static inline ushort dos_encode_byte(unsigned char byte)
1247 {
1248 register unsigned char *enc, b2, b1;
1249 register ushort word;
1250
1251 enc=mfmencode;
1252 b1=byte;
1253 b2=b1>>4;
1254 b1&=15;
1255 word=enc[b2] <<8 | enc [b1];
1256 return (word|((word&(256|64)) ? 0: 128));
1257 }
1258
1259 static void dos_encode_block(ushort *dest, unsigned char *src, int len)
1260 {
1261 int i;
1262
1263 for (i = 0; i < len; i++) {
1264 *dest=dos_encode_byte(*src++);
1265 *dest|=((dest[-1]&1)||(*dest&0x4000))? 0: 0x8000;
1266 dest++;
1267 }
1268 }
1269
1270 static unsigned long *ms_putsec(int drive, unsigned long *raw, int cnt)
1271 {
1272 static struct dos_header hdr={0,0,0,2,0,
1273 {78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78}};
1274 int i;
1275 static ushort crc[2]={0,0x4e4e};
1276
1277 drive&=3;
1278 /* id gap 1 */
1279 /* the MFM word before is always 9254 */
1280 for(i=0;i<6;i++)
1281 *raw++=0xaaaaaaaa;
1282 /* 3 sync + 1 headermark */
1283 *raw++=0x44894489;
1284 *raw++=0x44895554;
1285
1286 /* fill in the variable parts of the header */
1287 hdr.track=unit[drive].track/unit[drive].type->heads;
1288 hdr.side=unit[drive].track%unit[drive].type->heads;
1289 hdr.sec=cnt+1;
1290 hdr.crc=dos_hdr_crc(&hdr);
1291
1292 /* header (without "magic") and id gap 2*/
1293 dos_encode_block((ushort *)raw,(unsigned char *) &hdr.track,28);
1294 raw+=14;
1295
1296 /*id gap 3 */
1297 for(i=0;i<6;i++)
1298 *raw++=0xaaaaaaaa;
1299
1300 /* 3 syncs and 1 datamark */
1301 *raw++=0x44894489;
1302 *raw++=0x44895545;
1303
1304 /* data */
1305 dos_encode_block((ushort *)raw,
1306 (unsigned char *)unit[drive].trackbuf+cnt*512,512);
1307 raw+=256;
1308
1309 /*data crc + jd's special gap (long words :-/) */
1310 crc[0]=dos_data_crc(unit[drive].trackbuf+cnt*512);
1311 dos_encode_block((ushort *) raw,(unsigned char *)crc,4);
1312 raw+=2;
1313
1314 /* data gap */
1315 for(i=0;i<38;i++)
1316 *raw++=0x92549254;
1317
1318 return raw; /* wrote 652 MFM words */
1319 }
1320
1321 static void dos_write(int disk)
1322 {
1323 int cnt;
1324 unsigned long raw = (unsigned long) raw_buf;
1325 unsigned long *ptr=(unsigned long *)raw;
1326
1327 disk&=3;
1328 /* really gap4 + indexgap , but we write it first and round it up */
1329 for (cnt=0;cnt<425;cnt++)
1330 *ptr++=0x92549254;
1331
1332 /* the following is just guessed */
1333 if (unit[disk].type->sect_mult==2) /* check for HD-Disks */
1334 for(cnt=0;cnt<473;cnt++)
1335 *ptr++=0x92549254;
1336
1337 /* now the index marks...*/
1338 for (cnt=0;cnt<20;cnt++)
1339 *ptr++=0x92549254;
1340 for (cnt=0;cnt<6;cnt++)
1341 *ptr++=0xaaaaaaaa;
1342 *ptr++=0x52245224;
1343 *ptr++=0x52245552;
1344 for (cnt=0;cnt<20;cnt++)
1345 *ptr++=0x92549254;
1346
1347 /* sectors */
1348 for(cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++)
1349 ptr=ms_putsec(disk,ptr,cnt);
1350
1351 *(ushort *)ptr = 0xaaa8; /* MFM word before is always 0x9254 */
1352 }
1353
1354 /*
1355 * Here comes the high level stuff (i.e. the filesystem interface)
1356 * and helper functions.
1357 * Normally this should be the only part that has to be adapted to
1358 * different kernel versions.
1359 */
1360
1361 /* FIXME: this assumes the drive is still spinning -
1362 * which is only true if we complete writing a track within three seconds
1363 */
1364 static void flush_track_callback(struct timer_list *timer)
1365 {
1366 unsigned long nr = ((unsigned long)timer -
1367 (unsigned long)&flush_track_timer[0]) /
1368 sizeof(flush_track_timer[0]);
1369
1370 nr&=3;
1371 writefromint = 1;
1372 if (!try_fdc(nr)) {
1373 /* we might block in an interrupt, so try again later */
1374 flush_track_timer[nr].expires = jiffies + 1;
1375 add_timer(flush_track_timer + nr);
1376 return;
1377 }
1378 get_fdc(nr);
1379 (*unit[nr].dtype->write_fkt)(nr);
1380 if (!raw_write(nr)) {
1381 printk (KERN_NOTICE "floppy disk write protected\n");
1382 writefromint = 0;
1383 writepending = 0;
1384 }
1385 rel_fdc();
1386 }
1387
1388 static int non_int_flush_track (unsigned long nr)
1389 {
1390 unsigned long flags;
1391
1392 nr&=3;
1393 writefromint = 0;
1394 del_timer(&post_write_timer);
1395 get_fdc(nr);
1396 if (!fd_motor_on(nr)) {
1397 writepending = 0;
1398 rel_fdc();
1399 return 0;
1400 }
1401 local_irq_save(flags);
1402 if (writepending != 2) {
1403 local_irq_restore(flags);
1404 (*unit[nr].dtype->write_fkt)(nr);
1405 if (!raw_write(nr)) {
1406 printk (KERN_NOTICE "floppy disk write protected "
1407 "in write!\n");
1408 writepending = 0;
1409 return 0;
1410 }
1411 wait_event(wait_fd_block, block_flag != 2);
1412 }
1413 else {
1414 local_irq_restore(flags);
1415 ms_delay(2); /* 2 ms post_write delay */
1416 post_write(nr);
1417 }
1418 rel_fdc();
1419 return 1;
1420 }
1421
1422 static int get_track(int drive, int track)
1423 {
1424 int error, errcnt;
1425
1426 drive&=3;
1427 if (unit[drive].track == track)
1428 return 0;
1429 get_fdc(drive);
1430 if (!fd_motor_on(drive)) {
1431 rel_fdc();
1432 return -1;
1433 }
1434
1435 if (unit[drive].dirty == 1) {
1436 del_timer (flush_track_timer + drive);
1437 non_int_flush_track (drive);
1438 }
1439 errcnt = 0;
1440 while (errcnt < MAX_ERRORS) {
1441 if (!fd_seek(drive, track))
1442 return -1;
1443 raw_read(drive);
1444 error = (*unit[drive].dtype->read_fkt)(drive);
1445 if (error == 0) {
1446 rel_fdc();
1447 return 0;
1448 }
1449 /* Read Error Handling: recalibrate and try again */
1450 unit[drive].track = -1;
1451 errcnt++;
1452 }
1453 rel_fdc();
1454 return -1;
1455 }
1456
1457 static blk_status_t amiflop_rw_cur_segment(struct amiga_floppy_struct *floppy,
1458 struct request *rq)
1459 {
1460 int drive = floppy - unit;
1461 unsigned int cnt, block, track, sector;
1462 char *data;
1463
1464 for (cnt = 0; cnt < blk_rq_cur_sectors(rq); cnt++) {
1465 #ifdef DEBUG
1466 printk("fd: sector %ld + %d requested for %s\n",
1467 blk_rq_pos(rq), cnt,
1468 (rq_data_dir(rq) == READ) ? "read" : "write");
1469 #endif
1470 block = blk_rq_pos(rq) + cnt;
1471 track = block / (floppy->dtype->sects * floppy->type->sect_mult);
1472 sector = block % (floppy->dtype->sects * floppy->type->sect_mult);
1473 data = bio_data(rq->bio) + 512 * cnt;
1474 #ifdef DEBUG
1475 printk("access to track %d, sector %d, with buffer at "
1476 "0x%08lx\n", track, sector, data);
1477 #endif
1478
1479 if (get_track(drive, track) == -1)
1480 return BLK_STS_IOERR;
1481
1482 if (rq_data_dir(rq) == READ) {
1483 memcpy(data, floppy->trackbuf + sector * 512, 512);
1484 } else {
1485 memcpy(floppy->trackbuf + sector * 512, data, 512);
1486
1487 /* keep the drive spinning while writes are scheduled */
1488 if (!fd_motor_on(drive))
1489 return BLK_STS_IOERR;
1490 /*
1491 * setup a callback to write the track buffer
1492 * after a short (1 tick) delay.
1493 */
1494 floppy->dirty = 1;
1495 /* reset the timer */
1496 mod_timer (flush_track_timer + drive, jiffies + 1);
1497 }
1498 }
1499
1500 return BLK_STS_OK;
1501 }
1502
1503 static blk_status_t amiflop_queue_rq(struct blk_mq_hw_ctx *hctx,
1504 const struct blk_mq_queue_data *bd)
1505 {
1506 struct request *rq = bd->rq;
1507 struct amiga_floppy_struct *floppy = rq->rq_disk->private_data;
1508 blk_status_t err;
1509
1510 if (!spin_trylock_irq(&amiflop_lock))
1511 return BLK_STS_DEV_RESOURCE;
1512
1513 blk_mq_start_request(rq);
1514
1515 do {
1516 err = amiflop_rw_cur_segment(floppy, rq);
1517 } while (blk_update_request(rq, err, blk_rq_cur_bytes(rq)));
1518 blk_mq_end_request(rq, err);
1519
1520 spin_unlock_irq(&amiflop_lock);
1521 return BLK_STS_OK;
1522 }
1523
1524 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1525 {
1526 int drive = MINOR(bdev->bd_dev) & 3;
1527
1528 geo->heads = unit[drive].type->heads;
1529 geo->sectors = unit[drive].dtype->sects * unit[drive].type->sect_mult;
1530 geo->cylinders = unit[drive].type->tracks;
1531 return 0;
1532 }
1533
1534 static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode,
1535 unsigned int cmd, unsigned long param)
1536 {
1537 struct amiga_floppy_struct *p = bdev->bd_disk->private_data;
1538 int drive = p - unit;
1539 static struct floppy_struct getprm;
1540 void __user *argp = (void __user *)param;
1541
1542 switch(cmd){
1543 case FDFMTBEG:
1544 get_fdc(drive);
1545 if (fd_ref[drive] > 1) {
1546 rel_fdc();
1547 return -EBUSY;
1548 }
1549 fsync_bdev(bdev);
1550 if (fd_motor_on(drive) == 0) {
1551 rel_fdc();
1552 return -ENODEV;
1553 }
1554 if (fd_calibrate(drive) == 0) {
1555 rel_fdc();
1556 return -ENXIO;
1557 }
1558 floppy_off(drive);
1559 rel_fdc();
1560 break;
1561 case FDFMTTRK:
1562 if (param < p->type->tracks * p->type->heads)
1563 {
1564 get_fdc(drive);
1565 if (fd_seek(drive,param) != 0){
1566 memset(p->trackbuf, FD_FILL_BYTE,
1567 p->dtype->sects * p->type->sect_mult * 512);
1568 non_int_flush_track(drive);
1569 }
1570 floppy_off(drive);
1571 rel_fdc();
1572 }
1573 else
1574 return -EINVAL;
1575 break;
1576 case FDFMTEND:
1577 floppy_off(drive);
1578 invalidate_bdev(bdev);
1579 break;
1580 case FDGETPRM:
1581 memset((void *)&getprm, 0, sizeof (getprm));
1582 getprm.track=p->type->tracks;
1583 getprm.head=p->type->heads;
1584 getprm.sect=p->dtype->sects * p->type->sect_mult;
1585 getprm.size=p->blocks;
1586 if (copy_to_user(argp, &getprm, sizeof(struct floppy_struct)))
1587 return -EFAULT;
1588 break;
1589 case FDSETPRM:
1590 case FDDEFPRM:
1591 return -EINVAL;
1592 case FDFLUSH: /* unconditionally, even if not needed */
1593 del_timer (flush_track_timer + drive);
1594 non_int_flush_track(drive);
1595 break;
1596 #ifdef RAW_IOCTL
1597 case IOCTL_RAW_TRACK:
1598 if (copy_to_user(argp, raw_buf, p->type->read_size))
1599 return -EFAULT;
1600 else
1601 return p->type->read_size;
1602 #endif
1603 default:
1604 printk(KERN_DEBUG "fd_ioctl: unknown cmd %d for drive %d.",
1605 cmd, drive);
1606 return -ENOSYS;
1607 }
1608 return 0;
1609 }
1610
1611 static int fd_ioctl(struct block_device *bdev, fmode_t mode,
1612 unsigned int cmd, unsigned long param)
1613 {
1614 int ret;
1615
1616 mutex_lock(&amiflop_mutex);
1617 ret = fd_locked_ioctl(bdev, mode, cmd, param);
1618 mutex_unlock(&amiflop_mutex);
1619
1620 return ret;
1621 }
1622
1623 static void fd_probe(int dev)
1624 {
1625 unsigned long code;
1626 int type;
1627 int drive;
1628
1629 drive = dev & 3;
1630 code = fd_get_drive_id(drive);
1631
1632 /* get drive type */
1633 for (type = 0; type < num_dr_types; type++)
1634 if (drive_types[type].code == code)
1635 break;
1636
1637 if (type >= num_dr_types) {
1638 printk(KERN_WARNING "fd_probe: unsupported drive type "
1639 "%08lx found\n", code);
1640 unit[drive].type = &drive_types[num_dr_types-1]; /* FD_NODRIVE */
1641 return;
1642 }
1643
1644 unit[drive].type = drive_types + type;
1645 unit[drive].track = -1;
1646
1647 unit[drive].disk = -1;
1648 unit[drive].motor = 0;
1649 unit[drive].busy = 0;
1650 unit[drive].status = -1;
1651 }
1652
1653 /*
1654 * floppy_open check for aliasing (/dev/fd0 can be the same as
1655 * /dev/PS0 etc), and disallows simultaneous access to the same
1656 * drive with different device numbers.
1657 */
1658 static int floppy_open(struct block_device *bdev, fmode_t mode)
1659 {
1660 int drive = MINOR(bdev->bd_dev) & 3;
1661 int system = (MINOR(bdev->bd_dev) & 4) >> 2;
1662 int old_dev;
1663 unsigned long flags;
1664
1665 mutex_lock(&amiflop_mutex);
1666 old_dev = fd_device[drive];
1667
1668 if (fd_ref[drive] && old_dev != system) {
1669 mutex_unlock(&amiflop_mutex);
1670 return -EBUSY;
1671 }
1672
1673 if (mode & (FMODE_READ|FMODE_WRITE)) {
1674 check_disk_change(bdev);
1675 if (mode & FMODE_WRITE) {
1676 int wrprot;
1677
1678 get_fdc(drive);
1679 fd_select (drive);
1680 wrprot = !(ciaa.pra & DSKPROT);
1681 fd_deselect (drive);
1682 rel_fdc();
1683
1684 if (wrprot) {
1685 mutex_unlock(&amiflop_mutex);
1686 return -EROFS;
1687 }
1688 }
1689 }
1690
1691 local_irq_save(flags);
1692 fd_ref[drive]++;
1693 fd_device[drive] = system;
1694 local_irq_restore(flags);
1695
1696 unit[drive].dtype=&data_types[system];
1697 unit[drive].blocks=unit[drive].type->heads*unit[drive].type->tracks*
1698 data_types[system].sects*unit[drive].type->sect_mult;
1699 set_capacity(unit[drive].gendisk, unit[drive].blocks);
1700
1701 printk(KERN_INFO "fd%d: accessing %s-disk with %s-layout\n",drive,
1702 unit[drive].type->name, data_types[system].name);
1703
1704 mutex_unlock(&amiflop_mutex);
1705 return 0;
1706 }
1707
1708 static void floppy_release(struct gendisk *disk, fmode_t mode)
1709 {
1710 struct amiga_floppy_struct *p = disk->private_data;
1711 int drive = p - unit;
1712
1713 mutex_lock(&amiflop_mutex);
1714 if (unit[drive].dirty == 1) {
1715 del_timer (flush_track_timer + drive);
1716 non_int_flush_track (drive);
1717 }
1718
1719 if (!fd_ref[drive]--) {
1720 printk(KERN_CRIT "floppy_release with fd_ref == 0");
1721 fd_ref[drive] = 0;
1722 }
1723 #ifdef MODULE
1724 floppy_off (drive);
1725 #endif
1726 mutex_unlock(&amiflop_mutex);
1727 }
1728
1729 /*
1730 * check_events is never called from an interrupt, so we can relax a bit
1731 * here, sleep etc. Note that floppy-on tries to set current_DOR to point
1732 * to the desired drive, but it will probably not survive the sleep if
1733 * several floppies are used at the same time: thus the loop.
1734 */
1735 static unsigned amiga_check_events(struct gendisk *disk, unsigned int clearing)
1736 {
1737 struct amiga_floppy_struct *p = disk->private_data;
1738 int drive = p - unit;
1739 int changed;
1740 static int first_time = 1;
1741
1742 if (first_time)
1743 changed = first_time--;
1744 else {
1745 get_fdc(drive);
1746 fd_select (drive);
1747 changed = !(ciaa.pra & DSKCHANGE);
1748 fd_deselect (drive);
1749 rel_fdc();
1750 }
1751
1752 if (changed) {
1753 fd_probe(drive);
1754 p->track = -1;
1755 p->dirty = 0;
1756 writepending = 0; /* if this was true before, too bad! */
1757 writefromint = 0;
1758 return DISK_EVENT_MEDIA_CHANGE;
1759 }
1760 return 0;
1761 }
1762
1763 static const struct block_device_operations floppy_fops = {
1764 .owner = THIS_MODULE,
1765 .open = floppy_open,
1766 .release = floppy_release,
1767 .ioctl = fd_ioctl,
1768 .getgeo = fd_getgeo,
1769 .check_events = amiga_check_events,
1770 };
1771
1772 static const struct blk_mq_ops amiflop_mq_ops = {
1773 .queue_rq = amiflop_queue_rq,
1774 };
1775
1776 static struct gendisk *fd_alloc_disk(int drive)
1777 {
1778 struct gendisk *disk;
1779
1780 disk = alloc_disk(1);
1781 if (!disk)
1782 goto out;
1783
1784 disk->queue = blk_mq_init_sq_queue(&unit[drive].tag_set, &amiflop_mq_ops,
1785 2, BLK_MQ_F_SHOULD_MERGE);
1786 if (IS_ERR(disk->queue)) {
1787 disk->queue = NULL;
1788 goto out_put_disk;
1789 }
1790
1791 unit[drive].trackbuf = kmalloc(FLOPPY_MAX_SECTORS * 512, GFP_KERNEL);
1792 if (!unit[drive].trackbuf)
1793 goto out_cleanup_queue;
1794
1795 return disk;
1796
1797 out_cleanup_queue:
1798 blk_cleanup_queue(disk->queue);
1799 disk->queue = NULL;
1800 blk_mq_free_tag_set(&unit[drive].tag_set);
1801 out_put_disk:
1802 put_disk(disk);
1803 out:
1804 unit[drive].type->code = FD_NODRIVE;
1805 return NULL;
1806 }
1807
1808 static int __init fd_probe_drives(void)
1809 {
1810 int drive,drives,nomem;
1811
1812 pr_info("FD: probing units\nfound");
1813 drives=0;
1814 nomem=0;
1815 for(drive=0;drive<FD_MAX_UNITS;drive++) {
1816 struct gendisk *disk;
1817 fd_probe(drive);
1818 if (unit[drive].type->code == FD_NODRIVE)
1819 continue;
1820
1821 disk = fd_alloc_disk(drive);
1822 if (!disk) {
1823 pr_cont(" no mem for fd%d", drive);
1824 nomem = 1;
1825 continue;
1826 }
1827 unit[drive].gendisk = disk;
1828 drives++;
1829
1830 pr_cont(" fd%d",drive);
1831 disk->major = FLOPPY_MAJOR;
1832 disk->first_minor = drive;
1833 disk->fops = &floppy_fops;
1834 sprintf(disk->disk_name, "fd%d", drive);
1835 disk->private_data = &unit[drive];
1836 set_capacity(disk, 880*2);
1837 add_disk(disk);
1838 }
1839 if ((drives > 0) || (nomem == 0)) {
1840 if (drives == 0)
1841 pr_cont(" no drives");
1842 pr_cont("\n");
1843 return drives;
1844 }
1845 pr_cont("\n");
1846 return -ENOMEM;
1847 }
1848
1849 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
1850 {
1851 int drive = *part & 3;
1852 if (unit[drive].type->code == FD_NODRIVE)
1853 return NULL;
1854 *part = 0;
1855 return get_disk_and_module(unit[drive].gendisk);
1856 }
1857
1858 static int __init amiga_floppy_probe(struct platform_device *pdev)
1859 {
1860 int i, ret;
1861
1862 if (register_blkdev(FLOPPY_MAJOR,"fd"))
1863 return -EBUSY;
1864
1865 ret = -ENOMEM;
1866 raw_buf = amiga_chip_alloc(RAW_BUF_SIZE, "Floppy");
1867 if (!raw_buf) {
1868 printk("fd: cannot get chip mem buffer\n");
1869 goto out_blkdev;
1870 }
1871
1872 ret = -EBUSY;
1873 if (request_irq(IRQ_AMIGA_DSKBLK, fd_block_done, 0, "floppy_dma", NULL)) {
1874 printk("fd: cannot get irq for dma\n");
1875 goto out_irq;
1876 }
1877
1878 if (request_irq(IRQ_AMIGA_CIAA_TB, ms_isr, 0, "floppy_timer", NULL)) {
1879 printk("fd: cannot get irq for timer\n");
1880 goto out_irq2;
1881 }
1882
1883 ret = -ENODEV;
1884 if (fd_probe_drives() < 1) /* No usable drives */
1885 goto out_probe;
1886
1887 blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
1888 floppy_find, NULL, NULL);
1889
1890 /* initialize variables */
1891 timer_setup(&motor_on_timer, motor_on_callback, 0);
1892 motor_on_timer.expires = 0;
1893 for (i = 0; i < FD_MAX_UNITS; i++) {
1894 timer_setup(&motor_off_timer[i], fd_motor_off, 0);
1895 motor_off_timer[i].expires = 0;
1896 timer_setup(&flush_track_timer[i], flush_track_callback, 0);
1897 flush_track_timer[i].expires = 0;
1898
1899 unit[i].track = -1;
1900 }
1901
1902 timer_setup(&post_write_timer, post_write_callback, 0);
1903 post_write_timer.expires = 0;
1904
1905 for (i = 0; i < 128; i++)
1906 mfmdecode[i]=255;
1907 for (i = 0; i < 16; i++)
1908 mfmdecode[mfmencode[i]]=i;
1909
1910 /* make sure that disk DMA is enabled */
1911 custom.dmacon = DMAF_SETCLR | DMAF_DISK;
1912
1913 /* init ms timer */
1914 ciaa.crb = 8; /* one-shot, stop */
1915 return 0;
1916
1917 out_probe:
1918 free_irq(IRQ_AMIGA_CIAA_TB, NULL);
1919 out_irq2:
1920 free_irq(IRQ_AMIGA_DSKBLK, NULL);
1921 out_irq:
1922 amiga_chip_free(raw_buf);
1923 out_blkdev:
1924 unregister_blkdev(FLOPPY_MAJOR,"fd");
1925 return ret;
1926 }
1927
1928 static struct platform_driver amiga_floppy_driver = {
1929 .driver = {
1930 .name = "amiga-floppy",
1931 },
1932 };
1933
1934 static int __init amiga_floppy_init(void)
1935 {
1936 return platform_driver_probe(&amiga_floppy_driver, amiga_floppy_probe);
1937 }
1938
1939 module_init(amiga_floppy_init);
1940
1941 #ifndef MODULE
1942 static int __init amiga_floppy_setup (char *str)
1943 {
1944 int n;
1945 if (!MACH_IS_AMIGA)
1946 return 0;
1947 if (!get_option(&str, &n))
1948 return 0;
1949 printk (KERN_INFO "amiflop: Setting default df0 to %x\n", n);
1950 fd_def_df0 = n;
1951 return 1;
1952 }
1953
1954 __setup("floppy=", amiga_floppy_setup);
1955 #endif
1956
1957 MODULE_ALIAS("platform:amiga-floppy");