1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/amiga/amiflop.c
4 *
5 * Copyright (C) 1993 Greg Harp
6 * Portions of this driver are based on code contributed by Brad Pepers
7 *
8 * revised 28.5.95 by Joerg Dorchain
9 * - now no bugs(?) any more for both HD & DD
10 * - added support for 40 Track 5.25" drives, 80-track hopefully behaves
11 * like 3.5" dd (no way to test - are there any 5.25" drives out there
12 * that work on an A4000?)
13 * - wrote formatting routine (maybe dirty, but works)
14 *
15 * june/july 1995 added ms-dos support by Joerg Dorchain
16 * (portions based on messydos.device and various contributors)
17 * - currently only 9 and 18 sector disks
18 *
19 * - fixed a bug with the internal trackbuffer when using multiple
20 * disks the same time
21 * - made formatting a bit safer
22 * - added command line and machine based default for "silent" df0
23 *
24 * december 1995 adapted for 1.2.13pl4 by Joerg Dorchain
25 * - works but I think it's inefficient. (look in redo_fd_request)
26 * But the changes were very efficient. (only three and a half lines)
27 *
28 * january 1996 added special ioctl for tracking down read/write problems
29 * - usage ioctl(d, RAW_TRACK, ptr); the raw track buffer (MFM-encoded data
30 * is copied to area. (area should be large enough since no checking is
31 * done - 30K is currently sufficient). return the actual size of the
32 * trackbuffer
33 * - replaced udelays() by a timer (CIAA timer B) for the waits
34 * needed for the disk mechanic.
35 *
36 * february 1996 fixed error recovery and multiple disk access
37 * - both got broken the first time I tampered with the driver :-(
38 * - still not safe, but better than before
39 *
40 * revised Marts 3rd, 1996 by Jes Sorensen for use in the 1.3.28 kernel.
41 * - Minor changes to accept the kdev_t.
42 * - Replaced some more udelays with ms_delays. Udelay is just a loop,
43 * and so the delay will be different depending on the given
44 * processor :-(
45 * - The driver could use a major cleanup because of the new
46 * major/minor handling that came with kdev_t. It seems to work for
47 * the time being, but I can't guarantee that it will stay like
48 * that when we start using 16 (24?) bit minors.
49 *
50 * restructured jan 1997 by Joerg Dorchain
51 * - Fixed Bug accessing multiple disks
52 * - some code cleanup
53 * - added trackbuffer for each drive to speed things up
54 * - fixed some race conditions (who finds the next may send it to me ;-)
55 */
56
57 #include <linux/module.h>
58 #include <linux/slab.h>
59
60 #include <linux/fd.h>
61 #include <linux/hdreg.h>
62 #include <linux/delay.h>
63 #include <linux/init.h>
64 #include <linux/major.h>
65 #include <linux/mutex.h>
66 #include <linux/fs.h>
67 #include <linux/blk-mq.h>
68 #include <linux/interrupt.h>
69 #include <linux/platform_device.h>
70
71 #include <asm/setup.h>
72 #include <linux/uaccess.h>
73 #include <asm/amigahw.h>
74 #include <asm/amigaints.h>
75 #include <asm/irq.h>
76
77 #undef DEBUG /* print _LOTS_ of infos */
78
79 #define RAW_IOCTL
80 #ifdef RAW_IOCTL
81 #define IOCTL_RAW_TRACK 0x5254524B /* 'RTRK' */
82 #endif
83
84 /*
85 * Defines
86 */
87
88 /*
89 * CIAAPRA bits (read only)
90 */
91
92 #define DSKRDY (0x1<<5) /* disk ready when low */
93 #define DSKTRACK0 (0x1<<4) /* head at track zero when low */
94 #define DSKPROT (0x1<<3) /* disk protected when low */
95 #define DSKCHANGE (0x1<<2) /* low when disk removed */
96
97 /*
98 * CIAAPRB bits (read/write)
99 */
100
101 #define DSKMOTOR (0x1<<7) /* motor on when low */
102 #define DSKSEL3 (0x1<<6) /* select drive 3 when low */
103 #define DSKSEL2 (0x1<<5) /* select drive 2 when low */
104 #define DSKSEL1 (0x1<<4) /* select drive 1 when low */
105 #define DSKSEL0 (0x1<<3) /* select drive 0 when low */
106 #define DSKSIDE (0x1<<2) /* side selection: 0 = upper, 1 = lower */
107 #define DSKDIREC (0x1<<1) /* step direction: 0=in, 1=out (to trk 0) */
108 #define DSKSTEP (0x1) /* pulse low to step head 1 track */
109
110 /*
111 * DSKBYTR bits (read only)
112 */
113
114 #define DSKBYT (1<<15) /* register contains valid byte when set */
115 #define DMAON (1<<14) /* disk DMA enabled */
116 #define DISKWRITE (1<<13) /* disk write bit in DSKLEN enabled */
117 #define WORDEQUAL (1<<12) /* DSKSYNC register match when true */
118 /* bits 7-0 are data */
119
120 /*
121 * ADKCON/ADKCONR bits
122 */
123
124 #ifndef SETCLR
125 #define ADK_SETCLR (1<<15) /* control bit */
126 #endif
127 #define ADK_PRECOMP1 (1<<14) /* precompensation selection */
128 #define ADK_PRECOMP0 (1<<13) /* 00=none, 01=140ns, 10=280ns, 11=500ns */
129 #define ADK_MFMPREC (1<<12) /* 0=GCR precomp., 1=MFM precomp. */
130 #define ADK_WORDSYNC (1<<10) /* enable DSKSYNC auto DMA */
131 #define ADK_MSBSYNC (1<<9) /* when 1, enable sync on MSbit (for GCR) */
132 #define ADK_FAST (1<<8) /* bit cell: 0=2us (GCR), 1=1us (MFM) */
133
134 /*
135 * DSKLEN bits
136 */
137
138 #define DSKLEN_DMAEN (1<<15)
139 #define DSKLEN_WRITE (1<<14)
140
141 /*
142 * INTENA/INTREQ bits
143 */
144
145 #define DSKINDEX (0x1<<4) /* DSKINDEX bit */
146
147 /*
148 * Misc
149 */
150
151 #define MFM_SYNC 0x4489 /* standard MFM sync value */
152
153 /* Values for FD_COMMAND */
154 #define FD_RECALIBRATE 0x07 /* move to track 0 */
155 #define FD_SEEK 0x0F /* seek track */
156 #define FD_READ 0xE6 /* read with MT, MFM, SKip deleted */
157 #define FD_WRITE 0xC5 /* write with MT, MFM */
158 #define FD_SENSEI 0x08 /* Sense Interrupt Status */
159 #define FD_SPECIFY 0x03 /* specify HUT etc */
160 #define FD_FORMAT 0x4D /* format one track */
161 #define FD_VERSION 0x10 /* get version code */
162 #define FD_CONFIGURE 0x13 /* configure FIFO operation */
163 #define FD_PERPENDICULAR 0x12 /* perpendicular r/w mode */
164
165 #define FD_MAX_UNITS 4 /* Max. Number of drives */
166 #define FLOPPY_MAX_SECTORS 22 /* Max. Number of sectors per track */
167
168 struct fd_data_type {
169 char *name; /* description of data type */
170 int sects; /* sectors per track */
171 int (*read_fkt)(int); /* read whole track */
172 void (*write_fkt)(int); /* write whole track */
173 };
174
175 struct fd_drive_type {
176 unsigned long code; /* code returned from drive */
177 char *name; /* description of drive */
178 unsigned int tracks; /* number of tracks */
179 unsigned int heads; /* number of heads */
180 unsigned int read_size; /* raw read size for one track */
181 unsigned int write_size; /* raw write size for one track */
182 unsigned int sect_mult; /* sectors and gap multiplier (HD = 2) */
183 unsigned int precomp1; /* start track for precomp 1 */
184 unsigned int precomp2; /* start track for precomp 2 */
185 unsigned int step_delay; /* time (in ms) for delay after step */
186 unsigned int settle_time; /* time to settle after dir change */
187 unsigned int side_time; /* time needed to change sides */
188 };
189
190 struct amiga_floppy_struct {
191 struct fd_drive_type *type; /* type of floppy for this unit */
192 struct fd_data_type *dtype; /* type of floppy for this unit */
193 int track; /* current track (-1 == unknown) */
194 unsigned char *trackbuf; /* current track (kmaloc()'d */
195
196 int blocks; /* total # blocks on disk */
197
198 int changed; /* true when not known */
199 int disk; /* disk in drive (-1 == unknown) */
200 int motor; /* true when motor is at speed */
201 int busy; /* true when drive is active */
202 int dirty; /* true when trackbuf is not on disk */
203 int status; /* current error code for unit */
204 struct gendisk *gendisk[2];
205 struct blk_mq_tag_set tag_set;
206 };
207
208 /*
209 * Error codes
210 */
211 #define FD_OK 0 /* operation succeeded */
212 #define FD_ERROR -1 /* general error (seek, read, write, etc) */
213 #define FD_NOUNIT 1 /* unit does not exist */
214 #define FD_UNITBUSY 2 /* unit already active */
215 #define FD_NOTACTIVE 3 /* unit is not active */
216 #define FD_NOTREADY 4 /* unit is not ready (motor not on/no disk) */
217
218 #define MFM_NOSYNC 1
219 #define MFM_HEADER 2
220 #define MFM_DATA 3
221 #define MFM_TRACK 4
222
223 /*
224 * Floppy ID values
225 */
226 #define FD_NODRIVE 0x00000000 /* response when no unit is present */
227 #define FD_DD_3 0xffffffff /* double-density 3.5" (880K) drive */
228 #define FD_HD_3 0x55555555 /* high-density 3.5" (1760K) drive */
229 #define FD_DD_5 0xaaaaaaaa /* double-density 5.25" (440K) drive */
230
231 static DEFINE_MUTEX(amiflop_mutex);
232 static unsigned long int fd_def_df0 = FD_DD_3; /* default for df0 if it doesn't identify */
233
234 module_param(fd_def_df0, ulong, 0);
235 MODULE_DESCRIPTION("Amiga floppy driver");
236 MODULE_LICENSE("GPL");
237
238 /*
239 * Macros
240 */
241 #define MOTOR_ON (ciab.prb &= ~DSKMOTOR)
242 #define MOTOR_OFF (ciab.prb |= DSKMOTOR)
243 #define SELECT(mask) (ciab.prb &= ~mask)
244 #define DESELECT(mask) (ciab.prb |= mask)
245 #define SELMASK(drive) (1 << (3 + (drive & 3)))
246
247 static struct fd_drive_type drive_types[] = {
248 /* code name tr he rdsz wrsz sm pc1 pc2 sd st st*/
249 /* warning: times are now in milliseconds (ms) */
250 { FD_DD_3, "DD 3.5", 80, 2, 14716, 13630, 1, 80,161, 3, 18, 1},
251 { FD_HD_3, "HD 3.5", 80, 2, 28344, 27258, 2, 80,161, 3, 18, 1},
252 { FD_DD_5, "DD 5.25", 40, 2, 14716, 13630, 1, 40, 81, 6, 30, 2},
253 { FD_NODRIVE, "No Drive", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
254 };
255 static int num_dr_types = ARRAY_SIZE(drive_types);
256
257 static int amiga_read(int), dos_read(int);
258 static void amiga_write(int), dos_write(int);
259 static struct fd_data_type data_types[] = {
260 { "Amiga", 11 , amiga_read, amiga_write},
261 { "MS-Dos", 9, dos_read, dos_write}
262 };
263
264 /* current info on each unit */
265 static struct amiga_floppy_struct unit[FD_MAX_UNITS];
266
267 static struct timer_list flush_track_timer[FD_MAX_UNITS];
268 static struct timer_list post_write_timer;
269 static unsigned long post_write_timer_drive;
270 static struct timer_list motor_on_timer;
271 static struct timer_list motor_off_timer[FD_MAX_UNITS];
272 static int on_attempts;
273
274 /* Synchronization of FDC access */
275 /* request loop (trackbuffer) */
276 static volatile int fdc_busy = -1;
277 static volatile int fdc_nested;
278 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
279
280 static DECLARE_COMPLETION(motor_on_completion);
281
282 static volatile int selected = -1; /* currently selected drive */
283
284 static int writepending;
285 static int writefromint;
286 static char *raw_buf;
287
288 static DEFINE_SPINLOCK(amiflop_lock);
289
290 #define RAW_BUF_SIZE 30000 /* size of raw disk data */
291
292 /*
293 * These are global variables, as that's the easiest way to give
294 * information to interrupts. They are the data used for the current
295 * request.
296 */
297 static volatile char block_flag;
298 static DECLARE_WAIT_QUEUE_HEAD(wait_fd_block);
299
300 /* MS-Dos MFM Coding tables (should go quick and easy) */
301 static unsigned char mfmencode[16]={
302 0x2a, 0x29, 0x24, 0x25, 0x12, 0x11, 0x14, 0x15,
303 0x4a, 0x49, 0x44, 0x45, 0x52, 0x51, 0x54, 0x55
304 };
305 static unsigned char mfmdecode[128];
306
307 /* floppy internal millisecond timer stuff */
308 static DECLARE_COMPLETION(ms_wait_completion);
309 #define MS_TICKS ((amiga_eclock+50)/1000)
310
311 /*
312 * Note that MAX_ERRORS=X doesn't imply that we retry every bad read
313 * max X times - some types of errors increase the errorcount by 2 or
314 * even 3, so we might actually retry only X/2 times before giving up.
315 */
316 #define MAX_ERRORS 12
317
318 #define custom amiga_custom
319
320 /* Prevent "aliased" accesses. */
321 static int fd_ref[4] = { 0,0,0,0 };
322 static int fd_device[4] = { 0, 0, 0, 0 };
323
324 /*
325 * Here come the actual hardware access and helper functions.
326 * They are not reentrant and single threaded because all drives
327 * share the same hardware and the same trackbuffer.
328 */
329
330 /* Milliseconds timer */
331
ms_isr(int irq,void * dummy)332 static irqreturn_t ms_isr(int irq, void *dummy)
333 {
334 complete(&ms_wait_completion);
335 return IRQ_HANDLED;
336 }
337
338 /* all waits are queued up
339 A more generic routine would do a schedule a la timer.device */
ms_delay(int ms)340 static void ms_delay(int ms)
341 {
342 int ticks;
343 static DEFINE_MUTEX(mutex);
344
345 if (ms > 0) {
346 mutex_lock(&mutex);
347 ticks = MS_TICKS*ms-1;
348 ciaa.tblo=ticks%256;
349 ciaa.tbhi=ticks/256;
350 ciaa.crb=0x19; /*count eclock, force load, one-shoot, start */
351 wait_for_completion(&ms_wait_completion);
352 mutex_unlock(&mutex);
353 }
354 }
355
356 /* Hardware semaphore */
357
358 /* returns true when we would get the semaphore */
try_fdc(int drive)359 static inline int try_fdc(int drive)
360 {
361 drive &= 3;
362 return ((fdc_busy < 0) || (fdc_busy == drive));
363 }
364
get_fdc(int drive)365 static void get_fdc(int drive)
366 {
367 unsigned long flags;
368
369 drive &= 3;
370 #ifdef DEBUG
371 printk("get_fdc: drive %d fdc_busy %d fdc_nested %d\n",drive,fdc_busy,fdc_nested);
372 #endif
373 local_irq_save(flags);
374 wait_event(fdc_wait, try_fdc(drive));
375 fdc_busy = drive;
376 fdc_nested++;
377 local_irq_restore(flags);
378 }
379
rel_fdc(void)380 static inline void rel_fdc(void)
381 {
382 #ifdef DEBUG
383 if (fdc_nested == 0)
384 printk("fd: unmatched rel_fdc\n");
385 printk("rel_fdc: fdc_busy %d fdc_nested %d\n",fdc_busy,fdc_nested);
386 #endif
387 fdc_nested--;
388 if (fdc_nested == 0) {
389 fdc_busy = -1;
390 wake_up(&fdc_wait);
391 }
392 }
393
fd_select(int drive)394 static void fd_select (int drive)
395 {
396 unsigned char prb = ~0;
397
398 drive&=3;
399 #ifdef DEBUG
400 printk("selecting %d\n",drive);
401 #endif
402 if (drive == selected)
403 return;
404 get_fdc(drive);
405 selected = drive;
406
407 if (unit[drive].track % 2 != 0)
408 prb &= ~DSKSIDE;
409 if (unit[drive].motor == 1)
410 prb &= ~DSKMOTOR;
411 ciab.prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
412 ciab.prb = prb;
413 prb &= ~SELMASK(drive);
414 ciab.prb = prb;
415 rel_fdc();
416 }
417
fd_deselect(int drive)418 static void fd_deselect (int drive)
419 {
420 unsigned char prb;
421 unsigned long flags;
422
423 drive&=3;
424 #ifdef DEBUG
425 printk("deselecting %d\n",drive);
426 #endif
427 if (drive != selected) {
428 printk(KERN_WARNING "Deselecting drive %d while %d was selected!\n",drive,selected);
429 return;
430 }
431
432 get_fdc(drive);
433 local_irq_save(flags);
434
435 selected = -1;
436
437 prb = ciab.prb;
438 prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
439 ciab.prb = prb;
440
441 local_irq_restore (flags);
442 rel_fdc();
443
444 }
445
motor_on_callback(struct timer_list * unused)446 static void motor_on_callback(struct timer_list *unused)
447 {
448 if (!(ciaa.pra & DSKRDY) || --on_attempts == 0) {
449 complete_all(&motor_on_completion);
450 } else {
451 motor_on_timer.expires = jiffies + HZ/10;
452 add_timer(&motor_on_timer);
453 }
454 }
455
fd_motor_on(int nr)456 static int fd_motor_on(int nr)
457 {
458 nr &= 3;
459
460 del_timer(motor_off_timer + nr);
461
462 if (!unit[nr].motor) {
463 unit[nr].motor = 1;
464 fd_select(nr);
465
466 reinit_completion(&motor_on_completion);
467 mod_timer(&motor_on_timer, jiffies + HZ/2);
468
469 on_attempts = 10;
470 wait_for_completion(&motor_on_completion);
471 fd_deselect(nr);
472 }
473
474 if (on_attempts == 0) {
475 on_attempts = -1;
476 #if 0
477 printk (KERN_ERR "motor_on failed, turning motor off\n");
478 fd_motor_off (motor_off_timer + nr);
479 return 0;
480 #else
481 printk (KERN_WARNING "DSKRDY not set after 1.5 seconds - assuming drive is spinning notwithstanding\n");
482 #endif
483 }
484
485 return 1;
486 }
487
fd_motor_off(struct timer_list * timer)488 static void fd_motor_off(struct timer_list *timer)
489 {
490 unsigned long drive = ((unsigned long)timer -
491 (unsigned long)&motor_off_timer[0]) /
492 sizeof(motor_off_timer[0]);
493
494 drive&=3;
495 if (!try_fdc(drive)) {
496 /* We would be blocked in an interrupt, so try again later */
497 timer->expires = jiffies + 1;
498 add_timer(timer);
499 return;
500 }
501 unit[drive].motor = 0;
502 fd_select(drive);
503 udelay (1);
504 fd_deselect(drive);
505 }
506
floppy_off(unsigned int nr)507 static void floppy_off (unsigned int nr)
508 {
509 int drive;
510
511 drive = nr & 3;
512 mod_timer(motor_off_timer + drive, jiffies + 3*HZ);
513 }
514
fd_calibrate(int drive)515 static int fd_calibrate(int drive)
516 {
517 unsigned char prb;
518 int n;
519
520 drive &= 3;
521 get_fdc(drive);
522 if (!fd_motor_on (drive))
523 return 0;
524 fd_select (drive);
525 prb = ciab.prb;
526 prb |= DSKSIDE;
527 prb &= ~DSKDIREC;
528 ciab.prb = prb;
529 for (n = unit[drive].type->tracks/2; n != 0; --n) {
530 if (ciaa.pra & DSKTRACK0)
531 break;
532 prb &= ~DSKSTEP;
533 ciab.prb = prb;
534 prb |= DSKSTEP;
535 udelay (2);
536 ciab.prb = prb;
537 ms_delay(unit[drive].type->step_delay);
538 }
539 ms_delay (unit[drive].type->settle_time);
540 prb |= DSKDIREC;
541 n = unit[drive].type->tracks + 20;
542 for (;;) {
543 prb &= ~DSKSTEP;
544 ciab.prb = prb;
545 prb |= DSKSTEP;
546 udelay (2);
547 ciab.prb = prb;
548 ms_delay(unit[drive].type->step_delay + 1);
549 if ((ciaa.pra & DSKTRACK0) == 0)
550 break;
551 if (--n == 0) {
552 printk (KERN_ERR "fd%d: calibrate failed, turning motor off\n", drive);
553 fd_motor_off (motor_off_timer + drive);
554 unit[drive].track = -1;
555 rel_fdc();
556 return 0;
557 }
558 }
559 unit[drive].track = 0;
560 ms_delay(unit[drive].type->settle_time);
561
562 rel_fdc();
563 fd_deselect(drive);
564 return 1;
565 }
566
fd_seek(int drive,int track)567 static int fd_seek(int drive, int track)
568 {
569 unsigned char prb;
570 int cnt;
571
572 #ifdef DEBUG
573 printk("seeking drive %d to track %d\n",drive,track);
574 #endif
575 drive &= 3;
576 get_fdc(drive);
577 if (unit[drive].track == track) {
578 rel_fdc();
579 return 1;
580 }
581 if (!fd_motor_on(drive)) {
582 rel_fdc();
583 return 0;
584 }
585 if (unit[drive].track < 0 && !fd_calibrate(drive)) {
586 rel_fdc();
587 return 0;
588 }
589
590 fd_select (drive);
591 cnt = unit[drive].track/2 - track/2;
592 prb = ciab.prb;
593 prb |= DSKSIDE | DSKDIREC;
594 if (track % 2 != 0)
595 prb &= ~DSKSIDE;
596 if (cnt < 0) {
597 cnt = - cnt;
598 prb &= ~DSKDIREC;
599 }
600 ciab.prb = prb;
601 if (track % 2 != unit[drive].track % 2)
602 ms_delay (unit[drive].type->side_time);
603 unit[drive].track = track;
604 if (cnt == 0) {
605 rel_fdc();
606 fd_deselect(drive);
607 return 1;
608 }
609 do {
610 prb &= ~DSKSTEP;
611 ciab.prb = prb;
612 prb |= DSKSTEP;
613 udelay (1);
614 ciab.prb = prb;
615 ms_delay (unit[drive].type->step_delay);
616 } while (--cnt != 0);
617 ms_delay (unit[drive].type->settle_time);
618
619 rel_fdc();
620 fd_deselect(drive);
621 return 1;
622 }
623
fd_get_drive_id(int drive)624 static unsigned long fd_get_drive_id(int drive)
625 {
626 int i;
627 ulong id = 0;
628
629 drive&=3;
630 get_fdc(drive);
631 /* set up for ID */
632 MOTOR_ON;
633 udelay(2);
634 SELECT(SELMASK(drive));
635 udelay(2);
636 DESELECT(SELMASK(drive));
637 udelay(2);
638 MOTOR_OFF;
639 udelay(2);
640 SELECT(SELMASK(drive));
641 udelay(2);
642 DESELECT(SELMASK(drive));
643 udelay(2);
644
645 /* loop and read disk ID */
646 for (i=0; i<32; i++) {
647 SELECT(SELMASK(drive));
648 udelay(2);
649
650 /* read and store value of DSKRDY */
651 id <<= 1;
652 id |= (ciaa.pra & DSKRDY) ? 0 : 1; /* cia regs are low-active! */
653
654 DESELECT(SELMASK(drive));
655 }
656
657 rel_fdc();
658
659 /*
660 * RB: At least A500/A2000's df0: don't identify themselves.
661 * As every (real) Amiga has at least a 3.5" DD drive as df0:
662 * we default to that if df0: doesn't identify as a certain
663 * type.
664 */
665 if(drive == 0 && id == FD_NODRIVE)
666 {
667 id = fd_def_df0;
668 printk(KERN_NOTICE "fd: drive 0 didn't identify, setting default %08lx\n", (ulong)fd_def_df0);
669 }
670 /* return the ID value */
671 return (id);
672 }
673
fd_block_done(int irq,void * dummy)674 static irqreturn_t fd_block_done(int irq, void *dummy)
675 {
676 if (block_flag)
677 custom.dsklen = 0x4000;
678
679 if (block_flag == 2) { /* writing */
680 writepending = 2;
681 post_write_timer.expires = jiffies + 1; /* at least 2 ms */
682 post_write_timer_drive = selected;
683 add_timer(&post_write_timer);
684 }
685 else { /* reading */
686 block_flag = 0;
687 wake_up (&wait_fd_block);
688 }
689 return IRQ_HANDLED;
690 }
691
raw_read(int drive)692 static void raw_read(int drive)
693 {
694 drive&=3;
695 get_fdc(drive);
696 wait_event(wait_fd_block, !block_flag);
697 fd_select(drive);
698 /* setup adkcon bits correctly */
699 custom.adkcon = ADK_MSBSYNC;
700 custom.adkcon = ADK_SETCLR|ADK_WORDSYNC|ADK_FAST;
701
702 custom.dsksync = MFM_SYNC;
703
704 custom.dsklen = 0;
705 custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf);
706 custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN;
707 custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN;
708
709 block_flag = 1;
710
711 wait_event(wait_fd_block, !block_flag);
712
713 custom.dsklen = 0;
714 fd_deselect(drive);
715 rel_fdc();
716 }
717
raw_write(int drive)718 static int raw_write(int drive)
719 {
720 ushort adk;
721
722 drive&=3;
723 get_fdc(drive); /* corresponds to rel_fdc() in post_write() */
724 if ((ciaa.pra & DSKPROT) == 0) {
725 rel_fdc();
726 return 0;
727 }
728 wait_event(wait_fd_block, !block_flag);
729 fd_select(drive);
730 /* clear adkcon bits */
731 custom.adkcon = ADK_PRECOMP1|ADK_PRECOMP0|ADK_WORDSYNC|ADK_MSBSYNC;
732 /* set appropriate adkcon bits */
733 adk = ADK_SETCLR|ADK_FAST;
734 if ((ulong)unit[drive].track >= unit[drive].type->precomp2)
735 adk |= ADK_PRECOMP1;
736 else if ((ulong)unit[drive].track >= unit[drive].type->precomp1)
737 adk |= ADK_PRECOMP0;
738 custom.adkcon = adk;
739
740 custom.dsklen = DSKLEN_WRITE;
741 custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf);
742 custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE;
743 custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE;
744
745 block_flag = 2;
746 return 1;
747 }
748
749 /*
750 * to be called at least 2ms after the write has finished but before any
751 * other access to the hardware.
752 */
post_write(unsigned long drive)753 static void post_write (unsigned long drive)
754 {
755 #ifdef DEBUG
756 printk("post_write for drive %ld\n",drive);
757 #endif
758 drive &= 3;
759 custom.dsklen = 0;
760 block_flag = 0;
761 writepending = 0;
762 writefromint = 0;
763 unit[drive].dirty = 0;
764 wake_up(&wait_fd_block);
765 fd_deselect(drive);
766 rel_fdc(); /* corresponds to get_fdc() in raw_write */
767 }
768
post_write_callback(struct timer_list * timer)769 static void post_write_callback(struct timer_list *timer)
770 {
771 post_write(post_write_timer_drive);
772 }
773
774 /*
775 * The following functions are to convert the block contents into raw data
776 * written to disk and vice versa.
777 * (Add other formats here ;-))
778 */
779
scan_sync(unsigned long raw,unsigned long end)780 static unsigned long scan_sync(unsigned long raw, unsigned long end)
781 {
782 ushort *ptr = (ushort *)raw, *endp = (ushort *)end;
783
784 while (ptr < endp && *ptr++ != 0x4489)
785 ;
786 if (ptr < endp) {
787 while (*ptr == 0x4489 && ptr < endp)
788 ptr++;
789 return (ulong)ptr;
790 }
791 return 0;
792 }
793
checksum(unsigned long * addr,int len)794 static inline unsigned long checksum(unsigned long *addr, int len)
795 {
796 unsigned long csum = 0;
797
798 len /= sizeof(*addr);
799 while (len-- > 0)
800 csum ^= *addr++;
801 csum = ((csum>>1) & 0x55555555) ^ (csum & 0x55555555);
802
803 return csum;
804 }
805
decode(unsigned long * data,unsigned long * raw,int len)806 static unsigned long decode (unsigned long *data, unsigned long *raw,
807 int len)
808 {
809 ulong *odd, *even;
810
811 /* convert length from bytes to longwords */
812 len >>= 2;
813 odd = raw;
814 even = odd + len;
815
816 /* prepare return pointer */
817 raw += len * 2;
818
819 do {
820 *data++ = ((*odd++ & 0x55555555) << 1) | (*even++ & 0x55555555);
821 } while (--len != 0);
822
823 return (ulong)raw;
824 }
825
826 struct header {
827 unsigned char magic;
828 unsigned char track;
829 unsigned char sect;
830 unsigned char ord;
831 unsigned char labels[16];
832 unsigned long hdrchk;
833 unsigned long datachk;
834 };
835
amiga_read(int drive)836 static int amiga_read(int drive)
837 {
838 unsigned long raw;
839 unsigned long end;
840 int scnt;
841 unsigned long csum;
842 struct header hdr;
843
844 drive&=3;
845 raw = (long) raw_buf;
846 end = raw + unit[drive].type->read_size;
847
848 for (scnt = 0;scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) {
849 if (!(raw = scan_sync(raw, end))) {
850 printk (KERN_INFO "can't find sync for sector %d\n", scnt);
851 return MFM_NOSYNC;
852 }
853
854 raw = decode ((ulong *)&hdr.magic, (ulong *)raw, 4);
855 raw = decode ((ulong *)&hdr.labels, (ulong *)raw, 16);
856 raw = decode ((ulong *)&hdr.hdrchk, (ulong *)raw, 4);
857 raw = decode ((ulong *)&hdr.datachk, (ulong *)raw, 4);
858 csum = checksum((ulong *)&hdr,
859 (char *)&hdr.hdrchk-(char *)&hdr);
860
861 #ifdef DEBUG
862 printk ("(%x,%d,%d,%d) (%lx,%lx,%lx,%lx) %lx %lx\n",
863 hdr.magic, hdr.track, hdr.sect, hdr.ord,
864 *(ulong *)&hdr.labels[0], *(ulong *)&hdr.labels[4],
865 *(ulong *)&hdr.labels[8], *(ulong *)&hdr.labels[12],
866 hdr.hdrchk, hdr.datachk);
867 #endif
868
869 if (hdr.hdrchk != csum) {
870 printk(KERN_INFO "MFM_HEADER: %08lx,%08lx\n", hdr.hdrchk, csum);
871 return MFM_HEADER;
872 }
873
874 /* verify track */
875 if (hdr.track != unit[drive].track) {
876 printk(KERN_INFO "MFM_TRACK: %d, %d\n", hdr.track, unit[drive].track);
877 return MFM_TRACK;
878 }
879
880 raw = decode ((ulong *)(unit[drive].trackbuf + hdr.sect*512),
881 (ulong *)raw, 512);
882 csum = checksum((ulong *)(unit[drive].trackbuf + hdr.sect*512), 512);
883
884 if (hdr.datachk != csum) {
885 printk(KERN_INFO "MFM_DATA: (%x:%d:%d:%d) sc=%d %lx, %lx\n",
886 hdr.magic, hdr.track, hdr.sect, hdr.ord, scnt,
887 hdr.datachk, csum);
888 printk (KERN_INFO "data=(%lx,%lx,%lx,%lx)\n",
889 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[0],
890 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[1],
891 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[2],
892 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[3]);
893 return MFM_DATA;
894 }
895 }
896
897 return 0;
898 }
899
encode(unsigned long data,unsigned long * dest)900 static void encode(unsigned long data, unsigned long *dest)
901 {
902 unsigned long data2;
903
904 data &= 0x55555555;
905 data2 = data ^ 0x55555555;
906 data |= ((data2 >> 1) | 0x80000000) & (data2 << 1);
907
908 if (*(dest - 1) & 0x00000001)
909 data &= 0x7FFFFFFF;
910
911 *dest = data;
912 }
913
encode_block(unsigned long * dest,unsigned long * src,int len)914 static void encode_block(unsigned long *dest, unsigned long *src, int len)
915 {
916 int cnt, to_cnt = 0;
917 unsigned long data;
918
919 /* odd bits */
920 for (cnt = 0; cnt < len / 4; cnt++) {
921 data = src[cnt] >> 1;
922 encode(data, dest + to_cnt++);
923 }
924
925 /* even bits */
926 for (cnt = 0; cnt < len / 4; cnt++) {
927 data = src[cnt];
928 encode(data, dest + to_cnt++);
929 }
930 }
931
putsec(int disk,unsigned long * raw,int cnt)932 static unsigned long *putsec(int disk, unsigned long *raw, int cnt)
933 {
934 struct header hdr;
935 int i;
936
937 disk&=3;
938 *raw = (raw[-1]&1) ? 0x2AAAAAAA : 0xAAAAAAAA;
939 raw++;
940 *raw++ = 0x44894489;
941
942 hdr.magic = 0xFF;
943 hdr.track = unit[disk].track;
944 hdr.sect = cnt;
945 hdr.ord = unit[disk].dtype->sects * unit[disk].type->sect_mult - cnt;
946 for (i = 0; i < 16; i++)
947 hdr.labels[i] = 0;
948 hdr.hdrchk = checksum((ulong *)&hdr,
949 (char *)&hdr.hdrchk-(char *)&hdr);
950 hdr.datachk = checksum((ulong *)(unit[disk].trackbuf+cnt*512), 512);
951
952 encode_block(raw, (ulong *)&hdr.magic, 4);
953 raw += 2;
954 encode_block(raw, (ulong *)&hdr.labels, 16);
955 raw += 8;
956 encode_block(raw, (ulong *)&hdr.hdrchk, 4);
957 raw += 2;
958 encode_block(raw, (ulong *)&hdr.datachk, 4);
959 raw += 2;
960 encode_block(raw, (ulong *)(unit[disk].trackbuf+cnt*512), 512);
961 raw += 256;
962
963 return raw;
964 }
965
amiga_write(int disk)966 static void amiga_write(int disk)
967 {
968 unsigned int cnt;
969 unsigned long *ptr = (unsigned long *)raw_buf;
970
971 disk&=3;
972 /* gap space */
973 for (cnt = 0; cnt < 415 * unit[disk].type->sect_mult; cnt++)
974 *ptr++ = 0xaaaaaaaa;
975
976 /* sectors */
977 for (cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++)
978 ptr = putsec (disk, ptr, cnt);
979 *(ushort *)ptr = (ptr[-1]&1) ? 0x2AA8 : 0xAAA8;
980 }
981
982
983 struct dos_header {
984 unsigned char track, /* 0-80 */
985 side, /* 0-1 */
986 sec, /* 0-...*/
987 len_desc;/* 2 */
988 unsigned short crc; /* on 68000 we got an alignment problem,
989 but this compiler solves it by adding silently
990 adding a pad byte so data won't fit
991 and this took about 3h to discover.... */
992 unsigned char gap1[22]; /* for longword-alignedness (0x4e) */
993 };
994
995 /* crc routines are borrowed from the messydos-handler */
996
997 /* excerpt from the messydos-device
998 ; The CRC is computed not only over the actual data, but including
999 ; the SYNC mark (3 * $a1) and the 'ID/DATA - Address Mark' ($fe/$fb).
1000 ; As we don't read or encode these fields into our buffers, we have to
1001 ; preload the registers containing the CRC with the values they would have
1002 ; after stepping over these fields.
1003 ;
1004 ; How CRCs "really" work:
1005 ;
1006 ; First, you should regard a bitstring as a series of coefficients of
1007 ; polynomials. We calculate with these polynomials in modulo-2
1008 ; arithmetic, in which both add and subtract are done the same as
1009 ; exclusive-or. Now, we modify our data (a very long polynomial) in
1010 ; such a way that it becomes divisible by the CCITT-standard 16-bit
1011 ; 16 12 5
1012 ; polynomial: x + x + x + 1, represented by $11021. The easiest
1013 ; way to do this would be to multiply (using proper arithmetic) our
1014 ; datablock with $11021. So we have:
1015 ; data * $11021 =
1016 ; data * ($10000 + $1021) =
1017 ; data * $10000 + data * $1021
1018 ; The left part of this is simple: Just add two 0 bytes. But then
1019 ; the right part (data $1021) remains difficult and even could have
1020 ; a carry into the left part. The solution is to use a modified
1021 ; multiplication, which has a result that is not correct, but with
1022 ; a difference of any multiple of $11021. We then only need to keep
1023 ; the 16 least significant bits of the result.
1024 ;
1025 ; The following algorithm does this for us:
1026 ;
1027 ; unsigned char *data, c, crclo, crchi;
1028 ; while (not done) {
1029 ; c = *data++ + crchi;
1030 ; crchi = (@ c) >> 8 + crclo;
1031 ; crclo = @ c;
1032 ; }
1033 ;
1034 ; Remember, + is done with EOR, the @ operator is in two tables (high
1035 ; and low byte separately), which is calculated as
1036 ;
1037 ; $1021 * (c & $F0)
1038 ; xor $1021 * (c & $0F)
1039 ; xor $1021 * (c >> 4) (* is regular multiplication)
1040 ;
1041 ;
1042 ; Anyway, the end result is the same as the remainder of the division of
1043 ; the data by $11021. I am afraid I need to study theory a bit more...
1044
1045
1046 my only works was to code this from manx to C....
1047
1048 */
1049
dos_crc(void * data_a3,int data_d0,int data_d1,int data_d3)1050 static ushort dos_crc(void * data_a3, int data_d0, int data_d1, int data_d3)
1051 {
1052 static unsigned char CRCTable1[] = {
1053 0x00,0x10,0x20,0x30,0x40,0x50,0x60,0x70,0x81,0x91,0xa1,0xb1,0xc1,0xd1,0xe1,0xf1,
1054 0x12,0x02,0x32,0x22,0x52,0x42,0x72,0x62,0x93,0x83,0xb3,0xa3,0xd3,0xc3,0xf3,0xe3,
1055 0x24,0x34,0x04,0x14,0x64,0x74,0x44,0x54,0xa5,0xb5,0x85,0x95,0xe5,0xf5,0xc5,0xd5,
1056 0x36,0x26,0x16,0x06,0x76,0x66,0x56,0x46,0xb7,0xa7,0x97,0x87,0xf7,0xe7,0xd7,0xc7,
1057 0x48,0x58,0x68,0x78,0x08,0x18,0x28,0x38,0xc9,0xd9,0xe9,0xf9,0x89,0x99,0xa9,0xb9,
1058 0x5a,0x4a,0x7a,0x6a,0x1a,0x0a,0x3a,0x2a,0xdb,0xcb,0xfb,0xeb,0x9b,0x8b,0xbb,0xab,
1059 0x6c,0x7c,0x4c,0x5c,0x2c,0x3c,0x0c,0x1c,0xed,0xfd,0xcd,0xdd,0xad,0xbd,0x8d,0x9d,
1060 0x7e,0x6e,0x5e,0x4e,0x3e,0x2e,0x1e,0x0e,0xff,0xef,0xdf,0xcf,0xbf,0xaf,0x9f,0x8f,
1061 0x91,0x81,0xb1,0xa1,0xd1,0xc1,0xf1,0xe1,0x10,0x00,0x30,0x20,0x50,0x40,0x70,0x60,
1062 0x83,0x93,0xa3,0xb3,0xc3,0xd3,0xe3,0xf3,0x02,0x12,0x22,0x32,0x42,0x52,0x62,0x72,
1063 0xb5,0xa5,0x95,0x85,0xf5,0xe5,0xd5,0xc5,0x34,0x24,0x14,0x04,0x74,0x64,0x54,0x44,
1064 0xa7,0xb7,0x87,0x97,0xe7,0xf7,0xc7,0xd7,0x26,0x36,0x06,0x16,0x66,0x76,0x46,0x56,
1065 0xd9,0xc9,0xf9,0xe9,0x99,0x89,0xb9,0xa9,0x58,0x48,0x78,0x68,0x18,0x08,0x38,0x28,
1066 0xcb,0xdb,0xeb,0xfb,0x8b,0x9b,0xab,0xbb,0x4a,0x5a,0x6a,0x7a,0x0a,0x1a,0x2a,0x3a,
1067 0xfd,0xed,0xdd,0xcd,0xbd,0xad,0x9d,0x8d,0x7c,0x6c,0x5c,0x4c,0x3c,0x2c,0x1c,0x0c,
1068 0xef,0xff,0xcf,0xdf,0xaf,0xbf,0x8f,0x9f,0x6e,0x7e,0x4e,0x5e,0x2e,0x3e,0x0e,0x1e
1069 };
1070
1071 static unsigned char CRCTable2[] = {
1072 0x00,0x21,0x42,0x63,0x84,0xa5,0xc6,0xe7,0x08,0x29,0x4a,0x6b,0x8c,0xad,0xce,0xef,
1073 0x31,0x10,0x73,0x52,0xb5,0x94,0xf7,0xd6,0x39,0x18,0x7b,0x5a,0xbd,0x9c,0xff,0xde,
1074 0x62,0x43,0x20,0x01,0xe6,0xc7,0xa4,0x85,0x6a,0x4b,0x28,0x09,0xee,0xcf,0xac,0x8d,
1075 0x53,0x72,0x11,0x30,0xd7,0xf6,0x95,0xb4,0x5b,0x7a,0x19,0x38,0xdf,0xfe,0x9d,0xbc,
1076 0xc4,0xe5,0x86,0xa7,0x40,0x61,0x02,0x23,0xcc,0xed,0x8e,0xaf,0x48,0x69,0x0a,0x2b,
1077 0xf5,0xd4,0xb7,0x96,0x71,0x50,0x33,0x12,0xfd,0xdc,0xbf,0x9e,0x79,0x58,0x3b,0x1a,
1078 0xa6,0x87,0xe4,0xc5,0x22,0x03,0x60,0x41,0xae,0x8f,0xec,0xcd,0x2a,0x0b,0x68,0x49,
1079 0x97,0xb6,0xd5,0xf4,0x13,0x32,0x51,0x70,0x9f,0xbe,0xdd,0xfc,0x1b,0x3a,0x59,0x78,
1080 0x88,0xa9,0xca,0xeb,0x0c,0x2d,0x4e,0x6f,0x80,0xa1,0xc2,0xe3,0x04,0x25,0x46,0x67,
1081 0xb9,0x98,0xfb,0xda,0x3d,0x1c,0x7f,0x5e,0xb1,0x90,0xf3,0xd2,0x35,0x14,0x77,0x56,
1082 0xea,0xcb,0xa8,0x89,0x6e,0x4f,0x2c,0x0d,0xe2,0xc3,0xa0,0x81,0x66,0x47,0x24,0x05,
1083 0xdb,0xfa,0x99,0xb8,0x5f,0x7e,0x1d,0x3c,0xd3,0xf2,0x91,0xb0,0x57,0x76,0x15,0x34,
1084 0x4c,0x6d,0x0e,0x2f,0xc8,0xe9,0x8a,0xab,0x44,0x65,0x06,0x27,0xc0,0xe1,0x82,0xa3,
1085 0x7d,0x5c,0x3f,0x1e,0xf9,0xd8,0xbb,0x9a,0x75,0x54,0x37,0x16,0xf1,0xd0,0xb3,0x92,
1086 0x2e,0x0f,0x6c,0x4d,0xaa,0x8b,0xe8,0xc9,0x26,0x07,0x64,0x45,0xa2,0x83,0xe0,0xc1,
1087 0x1f,0x3e,0x5d,0x7c,0x9b,0xba,0xd9,0xf8,0x17,0x36,0x55,0x74,0x93,0xb2,0xd1,0xf0
1088 };
1089
1090 /* look at the asm-code - what looks in C a bit strange is almost as good as handmade */
1091 register int i;
1092 register unsigned char *CRCT1, *CRCT2, *data, c, crch, crcl;
1093
1094 CRCT1=CRCTable1;
1095 CRCT2=CRCTable2;
1096 data=data_a3;
1097 crcl=data_d1;
1098 crch=data_d0;
1099 for (i=data_d3; i>=0; i--) {
1100 c = (*data++) ^ crch;
1101 crch = CRCT1[c] ^ crcl;
1102 crcl = CRCT2[c];
1103 }
1104 return (crch<<8)|crcl;
1105 }
1106
dos_hdr_crc(struct dos_header * hdr)1107 static inline ushort dos_hdr_crc (struct dos_header *hdr)
1108 {
1109 return dos_crc(&(hdr->track), 0xb2, 0x30, 3); /* precomputed magic */
1110 }
1111
dos_data_crc(unsigned char * data)1112 static inline ushort dos_data_crc(unsigned char *data)
1113 {
1114 return dos_crc(data, 0xe2, 0x95 ,511); /* precomputed magic */
1115 }
1116
dos_decode_byte(ushort word)1117 static inline unsigned char dos_decode_byte(ushort word)
1118 {
1119 register ushort w2;
1120 register unsigned char byte;
1121 register unsigned char *dec = mfmdecode;
1122
1123 w2=word;
1124 w2>>=8;
1125 w2&=127;
1126 byte = dec[w2];
1127 byte <<= 4;
1128 w2 = word & 127;
1129 byte |= dec[w2];
1130 return byte;
1131 }
1132
dos_decode(unsigned char * data,unsigned short * raw,int len)1133 static unsigned long dos_decode(unsigned char *data, unsigned short *raw, int len)
1134 {
1135 int i;
1136
1137 for (i = 0; i < len; i++)
1138 *data++=dos_decode_byte(*raw++);
1139 return ((ulong)raw);
1140 }
1141
1142 #ifdef DEBUG
dbg(unsigned long ptr)1143 static void dbg(unsigned long ptr)
1144 {
1145 printk("raw data @%08lx: %08lx, %08lx ,%08lx, %08lx\n", ptr,
1146 ((ulong *)ptr)[0], ((ulong *)ptr)[1],
1147 ((ulong *)ptr)[2], ((ulong *)ptr)[3]);
1148 }
1149 #endif
1150
dos_read(int drive)1151 static int dos_read(int drive)
1152 {
1153 unsigned long end;
1154 unsigned long raw;
1155 int scnt;
1156 unsigned short crc,data_crc[2];
1157 struct dos_header hdr;
1158
1159 drive&=3;
1160 raw = (long) raw_buf;
1161 end = raw + unit[drive].type->read_size;
1162
1163 for (scnt=0; scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) {
1164 do { /* search for the right sync of each sec-hdr */
1165 if (!(raw = scan_sync (raw, end))) {
1166 printk(KERN_INFO "dos_read: no hdr sync on "
1167 "track %d, unit %d for sector %d\n",
1168 unit[drive].track,drive,scnt);
1169 return MFM_NOSYNC;
1170 }
1171 #ifdef DEBUG
1172 dbg(raw);
1173 #endif
1174 } while (*((ushort *)raw)!=0x5554); /* loop usually only once done */
1175 raw+=2; /* skip over headermark */
1176 raw = dos_decode((unsigned char *)&hdr,(ushort *) raw,8);
1177 crc = dos_hdr_crc(&hdr);
1178
1179 #ifdef DEBUG
1180 printk("(%3d,%d,%2d,%d) %x\n", hdr.track, hdr.side,
1181 hdr.sec, hdr.len_desc, hdr.crc);
1182 #endif
1183
1184 if (crc != hdr.crc) {
1185 printk(KERN_INFO "dos_read: MFM_HEADER %04x,%04x\n",
1186 hdr.crc, crc);
1187 return MFM_HEADER;
1188 }
1189 if (hdr.track != unit[drive].track/unit[drive].type->heads) {
1190 printk(KERN_INFO "dos_read: MFM_TRACK %d, %d\n",
1191 hdr.track,
1192 unit[drive].track/unit[drive].type->heads);
1193 return MFM_TRACK;
1194 }
1195
1196 if (hdr.side != unit[drive].track%unit[drive].type->heads) {
1197 printk(KERN_INFO "dos_read: MFM_SIDE %d, %d\n",
1198 hdr.side,
1199 unit[drive].track%unit[drive].type->heads);
1200 return MFM_TRACK;
1201 }
1202
1203 if (hdr.len_desc != 2) {
1204 printk(KERN_INFO "dos_read: unknown sector len "
1205 "descriptor %d\n", hdr.len_desc);
1206 return MFM_DATA;
1207 }
1208 #ifdef DEBUG
1209 printk("hdr accepted\n");
1210 #endif
1211 if (!(raw = scan_sync (raw, end))) {
1212 printk(KERN_INFO "dos_read: no data sync on track "
1213 "%d, unit %d for sector%d, disk sector %d\n",
1214 unit[drive].track, drive, scnt, hdr.sec);
1215 return MFM_NOSYNC;
1216 }
1217 #ifdef DEBUG
1218 dbg(raw);
1219 #endif
1220
1221 if (*((ushort *)raw)!=0x5545) {
1222 printk(KERN_INFO "dos_read: no data mark after "
1223 "sync (%d,%d,%d,%d) sc=%d\n",
1224 hdr.track,hdr.side,hdr.sec,hdr.len_desc,scnt);
1225 return MFM_NOSYNC;
1226 }
1227
1228 raw+=2; /* skip data mark (included in checksum) */
1229 raw = dos_decode((unsigned char *)(unit[drive].trackbuf + (hdr.sec - 1) * 512), (ushort *) raw, 512);
1230 raw = dos_decode((unsigned char *)data_crc,(ushort *) raw,4);
1231 crc = dos_data_crc(unit[drive].trackbuf + (hdr.sec - 1) * 512);
1232
1233 if (crc != data_crc[0]) {
1234 printk(KERN_INFO "dos_read: MFM_DATA (%d,%d,%d,%d) "
1235 "sc=%d, %x %x\n", hdr.track, hdr.side,
1236 hdr.sec, hdr.len_desc, scnt,data_crc[0], crc);
1237 printk(KERN_INFO "data=(%lx,%lx,%lx,%lx,...)\n",
1238 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[0],
1239 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[1],
1240 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[2],
1241 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[3]);
1242 return MFM_DATA;
1243 }
1244 }
1245 return 0;
1246 }
1247
dos_encode_byte(unsigned char byte)1248 static inline ushort dos_encode_byte(unsigned char byte)
1249 {
1250 register unsigned char *enc, b2, b1;
1251 register ushort word;
1252
1253 enc=mfmencode;
1254 b1=byte;
1255 b2=b1>>4;
1256 b1&=15;
1257 word=enc[b2] <<8 | enc [b1];
1258 return (word|((word&(256|64)) ? 0: 128));
1259 }
1260
dos_encode_block(ushort * dest,unsigned char * src,int len)1261 static void dos_encode_block(ushort *dest, unsigned char *src, int len)
1262 {
1263 int i;
1264
1265 for (i = 0; i < len; i++) {
1266 *dest=dos_encode_byte(*src++);
1267 *dest|=((dest[-1]&1)||(*dest&0x4000))? 0: 0x8000;
1268 dest++;
1269 }
1270 }
1271
ms_putsec(int drive,unsigned long * raw,int cnt)1272 static unsigned long *ms_putsec(int drive, unsigned long *raw, int cnt)
1273 {
1274 static struct dos_header hdr={0,0,0,2,0,
1275 {78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78}};
1276 int i;
1277 static ushort crc[2]={0,0x4e4e};
1278
1279 drive&=3;
1280 /* id gap 1 */
1281 /* the MFM word before is always 9254 */
1282 for(i=0;i<6;i++)
1283 *raw++=0xaaaaaaaa;
1284 /* 3 sync + 1 headermark */
1285 *raw++=0x44894489;
1286 *raw++=0x44895554;
1287
1288 /* fill in the variable parts of the header */
1289 hdr.track=unit[drive].track/unit[drive].type->heads;
1290 hdr.side=unit[drive].track%unit[drive].type->heads;
1291 hdr.sec=cnt+1;
1292 hdr.crc=dos_hdr_crc(&hdr);
1293
1294 /* header (without "magic") and id gap 2*/
1295 dos_encode_block((ushort *)raw,(unsigned char *) &hdr.track,28);
1296 raw+=14;
1297
1298 /*id gap 3 */
1299 for(i=0;i<6;i++)
1300 *raw++=0xaaaaaaaa;
1301
1302 /* 3 syncs and 1 datamark */
1303 *raw++=0x44894489;
1304 *raw++=0x44895545;
1305
1306 /* data */
1307 dos_encode_block((ushort *)raw,
1308 (unsigned char *)unit[drive].trackbuf+cnt*512,512);
1309 raw+=256;
1310
1311 /*data crc + jd's special gap (long words :-/) */
1312 crc[0]=dos_data_crc(unit[drive].trackbuf+cnt*512);
1313 dos_encode_block((ushort *) raw,(unsigned char *)crc,4);
1314 raw+=2;
1315
1316 /* data gap */
1317 for(i=0;i<38;i++)
1318 *raw++=0x92549254;
1319
1320 return raw; /* wrote 652 MFM words */
1321 }
1322
dos_write(int disk)1323 static void dos_write(int disk)
1324 {
1325 int cnt;
1326 unsigned long raw = (unsigned long) raw_buf;
1327 unsigned long *ptr=(unsigned long *)raw;
1328
1329 disk&=3;
1330 /* really gap4 + indexgap , but we write it first and round it up */
1331 for (cnt=0;cnt<425;cnt++)
1332 *ptr++=0x92549254;
1333
1334 /* the following is just guessed */
1335 if (unit[disk].type->sect_mult==2) /* check for HD-Disks */
1336 for(cnt=0;cnt<473;cnt++)
1337 *ptr++=0x92549254;
1338
1339 /* now the index marks...*/
1340 for (cnt=0;cnt<20;cnt++)
1341 *ptr++=0x92549254;
1342 for (cnt=0;cnt<6;cnt++)
1343 *ptr++=0xaaaaaaaa;
1344 *ptr++=0x52245224;
1345 *ptr++=0x52245552;
1346 for (cnt=0;cnt<20;cnt++)
1347 *ptr++=0x92549254;
1348
1349 /* sectors */
1350 for(cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++)
1351 ptr=ms_putsec(disk,ptr,cnt);
1352
1353 *(ushort *)ptr = 0xaaa8; /* MFM word before is always 0x9254 */
1354 }
1355
1356 /*
1357 * Here comes the high level stuff (i.e. the filesystem interface)
1358 * and helper functions.
1359 * Normally this should be the only part that has to be adapted to
1360 * different kernel versions.
1361 */
1362
1363 /* FIXME: this assumes the drive is still spinning -
1364 * which is only true if we complete writing a track within three seconds
1365 */
flush_track_callback(struct timer_list * timer)1366 static void flush_track_callback(struct timer_list *timer)
1367 {
1368 unsigned long nr = ((unsigned long)timer -
1369 (unsigned long)&flush_track_timer[0]) /
1370 sizeof(flush_track_timer[0]);
1371
1372 nr&=3;
1373 writefromint = 1;
1374 if (!try_fdc(nr)) {
1375 /* we might block in an interrupt, so try again later */
1376 flush_track_timer[nr].expires = jiffies + 1;
1377 add_timer(flush_track_timer + nr);
1378 return;
1379 }
1380 get_fdc(nr);
1381 (*unit[nr].dtype->write_fkt)(nr);
1382 if (!raw_write(nr)) {
1383 printk (KERN_NOTICE "floppy disk write protected\n");
1384 writefromint = 0;
1385 writepending = 0;
1386 }
1387 rel_fdc();
1388 }
1389
non_int_flush_track(unsigned long nr)1390 static int non_int_flush_track (unsigned long nr)
1391 {
1392 unsigned long flags;
1393
1394 nr&=3;
1395 writefromint = 0;
1396 del_timer(&post_write_timer);
1397 get_fdc(nr);
1398 if (!fd_motor_on(nr)) {
1399 writepending = 0;
1400 rel_fdc();
1401 return 0;
1402 }
1403 local_irq_save(flags);
1404 if (writepending != 2) {
1405 local_irq_restore(flags);
1406 (*unit[nr].dtype->write_fkt)(nr);
1407 if (!raw_write(nr)) {
1408 printk (KERN_NOTICE "floppy disk write protected "
1409 "in write!\n");
1410 writepending = 0;
1411 return 0;
1412 }
1413 wait_event(wait_fd_block, block_flag != 2);
1414 }
1415 else {
1416 local_irq_restore(flags);
1417 ms_delay(2); /* 2 ms post_write delay */
1418 post_write(nr);
1419 }
1420 rel_fdc();
1421 return 1;
1422 }
1423
get_track(int drive,int track)1424 static int get_track(int drive, int track)
1425 {
1426 int error, errcnt;
1427
1428 drive&=3;
1429 if (unit[drive].track == track)
1430 return 0;
1431 get_fdc(drive);
1432 if (!fd_motor_on(drive)) {
1433 rel_fdc();
1434 return -1;
1435 }
1436
1437 if (unit[drive].dirty == 1) {
1438 del_timer (flush_track_timer + drive);
1439 non_int_flush_track (drive);
1440 }
1441 errcnt = 0;
1442 while (errcnt < MAX_ERRORS) {
1443 if (!fd_seek(drive, track))
1444 return -1;
1445 raw_read(drive);
1446 error = (*unit[drive].dtype->read_fkt)(drive);
1447 if (error == 0) {
1448 rel_fdc();
1449 return 0;
1450 }
1451 /* Read Error Handling: recalibrate and try again */
1452 unit[drive].track = -1;
1453 errcnt++;
1454 }
1455 rel_fdc();
1456 return -1;
1457 }
1458
amiflop_rw_cur_segment(struct amiga_floppy_struct * floppy,struct request * rq)1459 static blk_status_t amiflop_rw_cur_segment(struct amiga_floppy_struct *floppy,
1460 struct request *rq)
1461 {
1462 int drive = floppy - unit;
1463 unsigned int cnt, block, track, sector;
1464 char *data;
1465
1466 for (cnt = 0; cnt < blk_rq_cur_sectors(rq); cnt++) {
1467 #ifdef DEBUG
1468 printk("fd: sector %ld + %d requested for %s\n",
1469 blk_rq_pos(rq), cnt,
1470 (rq_data_dir(rq) == READ) ? "read" : "write");
1471 #endif
1472 block = blk_rq_pos(rq) + cnt;
1473 track = block / (floppy->dtype->sects * floppy->type->sect_mult);
1474 sector = block % (floppy->dtype->sects * floppy->type->sect_mult);
1475 data = bio_data(rq->bio) + 512 * cnt;
1476 #ifdef DEBUG
1477 printk("access to track %d, sector %d, with buffer at "
1478 "0x%08lx\n", track, sector, data);
1479 #endif
1480
1481 if (get_track(drive, track) == -1)
1482 return BLK_STS_IOERR;
1483
1484 if (rq_data_dir(rq) == READ) {
1485 memcpy(data, floppy->trackbuf + sector * 512, 512);
1486 } else {
1487 memcpy(floppy->trackbuf + sector * 512, data, 512);
1488
1489 /* keep the drive spinning while writes are scheduled */
1490 if (!fd_motor_on(drive))
1491 return BLK_STS_IOERR;
1492 /*
1493 * setup a callback to write the track buffer
1494 * after a short (1 tick) delay.
1495 */
1496 floppy->dirty = 1;
1497 /* reset the timer */
1498 mod_timer (flush_track_timer + drive, jiffies + 1);
1499 }
1500 }
1501
1502 return BLK_STS_OK;
1503 }
1504
amiflop_queue_rq(struct blk_mq_hw_ctx * hctx,const struct blk_mq_queue_data * bd)1505 static blk_status_t amiflop_queue_rq(struct blk_mq_hw_ctx *hctx,
1506 const struct blk_mq_queue_data *bd)
1507 {
1508 struct request *rq = bd->rq;
1509 struct amiga_floppy_struct *floppy = rq->q->disk->private_data;
1510 blk_status_t err;
1511
1512 if (!spin_trylock_irq(&amiflop_lock))
1513 return BLK_STS_DEV_RESOURCE;
1514
1515 blk_mq_start_request(rq);
1516
1517 do {
1518 err = amiflop_rw_cur_segment(floppy, rq);
1519 } while (blk_update_request(rq, err, blk_rq_cur_bytes(rq)));
1520 blk_mq_end_request(rq, err);
1521
1522 spin_unlock_irq(&amiflop_lock);
1523 return BLK_STS_OK;
1524 }
1525
fd_getgeo(struct block_device * bdev,struct hd_geometry * geo)1526 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1527 {
1528 int drive = MINOR(bdev->bd_dev) & 3;
1529
1530 geo->heads = unit[drive].type->heads;
1531 geo->sectors = unit[drive].dtype->sects * unit[drive].type->sect_mult;
1532 geo->cylinders = unit[drive].type->tracks;
1533 return 0;
1534 }
1535
fd_locked_ioctl(struct block_device * bdev,blk_mode_t mode,unsigned int cmd,unsigned long param)1536 static int fd_locked_ioctl(struct block_device *bdev, blk_mode_t mode,
1537 unsigned int cmd, unsigned long param)
1538 {
1539 struct amiga_floppy_struct *p = bdev->bd_disk->private_data;
1540 int drive = p - unit;
1541 static struct floppy_struct getprm;
1542 void __user *argp = (void __user *)param;
1543
1544 switch(cmd){
1545 case FDFMTBEG:
1546 get_fdc(drive);
1547 if (fd_ref[drive] > 1) {
1548 rel_fdc();
1549 return -EBUSY;
1550 }
1551 if (fd_motor_on(drive) == 0) {
1552 rel_fdc();
1553 return -ENODEV;
1554 }
1555 if (fd_calibrate(drive) == 0) {
1556 rel_fdc();
1557 return -ENXIO;
1558 }
1559 floppy_off(drive);
1560 rel_fdc();
1561 break;
1562 case FDFMTTRK:
1563 if (param < p->type->tracks * p->type->heads)
1564 {
1565 get_fdc(drive);
1566 if (fd_seek(drive,param) != 0){
1567 memset(p->trackbuf, FD_FILL_BYTE,
1568 p->dtype->sects * p->type->sect_mult * 512);
1569 non_int_flush_track(drive);
1570 }
1571 floppy_off(drive);
1572 rel_fdc();
1573 }
1574 else
1575 return -EINVAL;
1576 break;
1577 case FDFMTEND:
1578 floppy_off(drive);
1579 invalidate_bdev(bdev);
1580 break;
1581 case FDGETPRM:
1582 memset((void *)&getprm, 0, sizeof (getprm));
1583 getprm.track=p->type->tracks;
1584 getprm.head=p->type->heads;
1585 getprm.sect=p->dtype->sects * p->type->sect_mult;
1586 getprm.size=p->blocks;
1587 if (copy_to_user(argp, &getprm, sizeof(struct floppy_struct)))
1588 return -EFAULT;
1589 break;
1590 case FDSETPRM:
1591 case FDDEFPRM:
1592 return -EINVAL;
1593 case FDFLUSH: /* unconditionally, even if not needed */
1594 del_timer (flush_track_timer + drive);
1595 non_int_flush_track(drive);
1596 break;
1597 #ifdef RAW_IOCTL
1598 case IOCTL_RAW_TRACK:
1599 if (copy_to_user(argp, raw_buf, p->type->read_size))
1600 return -EFAULT;
1601 else
1602 return p->type->read_size;
1603 #endif
1604 default:
1605 return -ENOSYS;
1606 }
1607 return 0;
1608 }
1609
fd_ioctl(struct block_device * bdev,blk_mode_t mode,unsigned int cmd,unsigned long param)1610 static int fd_ioctl(struct block_device *bdev, blk_mode_t mode,
1611 unsigned int cmd, unsigned long param)
1612 {
1613 int ret;
1614
1615 mutex_lock(&amiflop_mutex);
1616 ret = fd_locked_ioctl(bdev, mode, cmd, param);
1617 mutex_unlock(&amiflop_mutex);
1618
1619 return ret;
1620 }
1621
fd_probe(int dev)1622 static void fd_probe(int dev)
1623 {
1624 unsigned long code;
1625 int type;
1626 int drive;
1627
1628 drive = dev & 3;
1629 code = fd_get_drive_id(drive);
1630
1631 /* get drive type */
1632 for (type = 0; type < num_dr_types; type++)
1633 if (drive_types[type].code == code)
1634 break;
1635
1636 if (type >= num_dr_types) {
1637 printk(KERN_WARNING "fd_probe: unsupported drive type "
1638 "%08lx found\n", code);
1639 unit[drive].type = &drive_types[num_dr_types-1]; /* FD_NODRIVE */
1640 return;
1641 }
1642
1643 unit[drive].type = drive_types + type;
1644 unit[drive].track = -1;
1645
1646 unit[drive].disk = -1;
1647 unit[drive].motor = 0;
1648 unit[drive].busy = 0;
1649 unit[drive].status = -1;
1650 }
1651
1652 /*
1653 * floppy_open check for aliasing (/dev/fd0 can be the same as
1654 * /dev/PS0 etc), and disallows simultaneous access to the same
1655 * drive with different device numbers.
1656 */
floppy_open(struct gendisk * disk,blk_mode_t mode)1657 static int floppy_open(struct gendisk *disk, blk_mode_t mode)
1658 {
1659 int drive = disk->first_minor & 3;
1660 int system = (disk->first_minor & 4) >> 2;
1661 int old_dev;
1662 unsigned long flags;
1663
1664 mutex_lock(&amiflop_mutex);
1665 old_dev = fd_device[drive];
1666
1667 if (fd_ref[drive] && old_dev != system) {
1668 mutex_unlock(&amiflop_mutex);
1669 return -EBUSY;
1670 }
1671
1672 if (unit[drive].type->code == FD_NODRIVE) {
1673 mutex_unlock(&amiflop_mutex);
1674 return -ENXIO;
1675 }
1676 if (mode & (BLK_OPEN_READ | BLK_OPEN_WRITE)) {
1677 disk_check_media_change(disk);
1678 if (mode & BLK_OPEN_WRITE) {
1679 int wrprot;
1680
1681 get_fdc(drive);
1682 fd_select (drive);
1683 wrprot = !(ciaa.pra & DSKPROT);
1684 fd_deselect (drive);
1685 rel_fdc();
1686
1687 if (wrprot) {
1688 mutex_unlock(&amiflop_mutex);
1689 return -EROFS;
1690 }
1691 }
1692 }
1693 local_irq_save(flags);
1694 fd_ref[drive]++;
1695 fd_device[drive] = system;
1696 local_irq_restore(flags);
1697
1698 unit[drive].dtype=&data_types[system];
1699 unit[drive].blocks=unit[drive].type->heads*unit[drive].type->tracks*
1700 data_types[system].sects*unit[drive].type->sect_mult;
1701 set_capacity(unit[drive].gendisk[system], unit[drive].blocks);
1702
1703 printk(KERN_INFO "fd%d: accessing %s-disk with %s-layout\n",drive,
1704 unit[drive].type->name, data_types[system].name);
1705
1706 mutex_unlock(&amiflop_mutex);
1707 return 0;
1708 }
1709
floppy_release(struct gendisk * disk)1710 static void floppy_release(struct gendisk *disk)
1711 {
1712 struct amiga_floppy_struct *p = disk->private_data;
1713 int drive = p - unit;
1714
1715 mutex_lock(&amiflop_mutex);
1716 if (unit[drive].dirty == 1) {
1717 del_timer (flush_track_timer + drive);
1718 non_int_flush_track (drive);
1719 }
1720
1721 if (!fd_ref[drive]--) {
1722 printk(KERN_CRIT "floppy_release with fd_ref == 0");
1723 fd_ref[drive] = 0;
1724 }
1725 #ifdef MODULE
1726 floppy_off (drive);
1727 #endif
1728 mutex_unlock(&amiflop_mutex);
1729 }
1730
1731 /*
1732 * check_events is never called from an interrupt, so we can relax a bit
1733 * here, sleep etc. Note that floppy-on tries to set current_DOR to point
1734 * to the desired drive, but it will probably not survive the sleep if
1735 * several floppies are used at the same time: thus the loop.
1736 */
amiga_check_events(struct gendisk * disk,unsigned int clearing)1737 static unsigned amiga_check_events(struct gendisk *disk, unsigned int clearing)
1738 {
1739 struct amiga_floppy_struct *p = disk->private_data;
1740 int drive = p - unit;
1741 int changed;
1742 static int first_time = 1;
1743
1744 if (first_time)
1745 changed = first_time--;
1746 else {
1747 get_fdc(drive);
1748 fd_select (drive);
1749 changed = !(ciaa.pra & DSKCHANGE);
1750 fd_deselect (drive);
1751 rel_fdc();
1752 }
1753
1754 if (changed) {
1755 fd_probe(drive);
1756 p->track = -1;
1757 p->dirty = 0;
1758 writepending = 0; /* if this was true before, too bad! */
1759 writefromint = 0;
1760 return DISK_EVENT_MEDIA_CHANGE;
1761 }
1762 return 0;
1763 }
1764
1765 static const struct block_device_operations floppy_fops = {
1766 .owner = THIS_MODULE,
1767 .open = floppy_open,
1768 .release = floppy_release,
1769 .ioctl = fd_ioctl,
1770 .getgeo = fd_getgeo,
1771 .check_events = amiga_check_events,
1772 };
1773
1774 static const struct blk_mq_ops amiflop_mq_ops = {
1775 .queue_rq = amiflop_queue_rq,
1776 };
1777
fd_alloc_disk(int drive,int system)1778 static int fd_alloc_disk(int drive, int system)
1779 {
1780 struct queue_limits lim = {
1781 .features = BLK_FEAT_ROTATIONAL,
1782 };
1783 struct gendisk *disk;
1784 int err;
1785
1786 disk = blk_mq_alloc_disk(&unit[drive].tag_set, &lim, NULL);
1787 if (IS_ERR(disk))
1788 return PTR_ERR(disk);
1789
1790 disk->major = FLOPPY_MAJOR;
1791 disk->first_minor = drive + system;
1792 disk->minors = 1;
1793 disk->fops = &floppy_fops;
1794 disk->flags |= GENHD_FL_NO_PART;
1795 disk->events = DISK_EVENT_MEDIA_CHANGE;
1796 if (system)
1797 sprintf(disk->disk_name, "fd%d_msdos", drive);
1798 else
1799 sprintf(disk->disk_name, "fd%d", drive);
1800 disk->private_data = &unit[drive];
1801 set_capacity(disk, 880 * 2);
1802
1803 unit[drive].gendisk[system] = disk;
1804 err = add_disk(disk);
1805 if (err)
1806 put_disk(disk);
1807 return err;
1808 }
1809
fd_alloc_drive(int drive)1810 static int fd_alloc_drive(int drive)
1811 {
1812 unit[drive].trackbuf = kmalloc(FLOPPY_MAX_SECTORS * 512, GFP_KERNEL);
1813 if (!unit[drive].trackbuf)
1814 goto out;
1815
1816 memset(&unit[drive].tag_set, 0, sizeof(unit[drive].tag_set));
1817 unit[drive].tag_set.ops = &amiflop_mq_ops;
1818 unit[drive].tag_set.nr_hw_queues = 1;
1819 unit[drive].tag_set.nr_maps = 1;
1820 unit[drive].tag_set.queue_depth = 2;
1821 unit[drive].tag_set.numa_node = NUMA_NO_NODE;
1822 unit[drive].tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
1823 if (blk_mq_alloc_tag_set(&unit[drive].tag_set))
1824 goto out_cleanup_trackbuf;
1825
1826 pr_cont(" fd%d", drive);
1827
1828 if (fd_alloc_disk(drive, 0) || fd_alloc_disk(drive, 1))
1829 goto out_cleanup_tagset;
1830 return 0;
1831
1832 out_cleanup_tagset:
1833 blk_mq_free_tag_set(&unit[drive].tag_set);
1834 out_cleanup_trackbuf:
1835 kfree(unit[drive].trackbuf);
1836 out:
1837 unit[drive].type->code = FD_NODRIVE;
1838 return -ENOMEM;
1839 }
1840
fd_probe_drives(void)1841 static int __init fd_probe_drives(void)
1842 {
1843 int drive,drives,nomem;
1844
1845 pr_info("FD: probing units\nfound");
1846 drives=0;
1847 nomem=0;
1848 for(drive=0;drive<FD_MAX_UNITS;drive++) {
1849 fd_probe(drive);
1850 if (unit[drive].type->code == FD_NODRIVE)
1851 continue;
1852
1853 if (fd_alloc_drive(drive) < 0) {
1854 pr_cont(" no mem for fd%d", drive);
1855 nomem = 1;
1856 continue;
1857 }
1858 drives++;
1859 }
1860 if ((drives > 0) || (nomem == 0)) {
1861 if (drives == 0)
1862 pr_cont(" no drives");
1863 pr_cont("\n");
1864 return drives;
1865 }
1866 pr_cont("\n");
1867 return -ENOMEM;
1868 }
1869
amiga_floppy_probe(struct platform_device * pdev)1870 static int __init amiga_floppy_probe(struct platform_device *pdev)
1871 {
1872 int i, ret;
1873
1874 if (register_blkdev(FLOPPY_MAJOR,"fd"))
1875 return -EBUSY;
1876
1877 ret = -ENOMEM;
1878 raw_buf = amiga_chip_alloc(RAW_BUF_SIZE, "Floppy");
1879 if (!raw_buf) {
1880 printk("fd: cannot get chip mem buffer\n");
1881 goto out_blkdev;
1882 }
1883
1884 ret = -EBUSY;
1885 if (request_irq(IRQ_AMIGA_DSKBLK, fd_block_done, 0, "floppy_dma", NULL)) {
1886 printk("fd: cannot get irq for dma\n");
1887 goto out_irq;
1888 }
1889
1890 if (request_irq(IRQ_AMIGA_CIAA_TB, ms_isr, 0, "floppy_timer", NULL)) {
1891 printk("fd: cannot get irq for timer\n");
1892 goto out_irq2;
1893 }
1894
1895 ret = -ENODEV;
1896 if (fd_probe_drives() < 1) /* No usable drives */
1897 goto out_probe;
1898
1899 /* initialize variables */
1900 timer_setup(&motor_on_timer, motor_on_callback, 0);
1901 motor_on_timer.expires = 0;
1902 for (i = 0; i < FD_MAX_UNITS; i++) {
1903 timer_setup(&motor_off_timer[i], fd_motor_off, 0);
1904 motor_off_timer[i].expires = 0;
1905 timer_setup(&flush_track_timer[i], flush_track_callback, 0);
1906 flush_track_timer[i].expires = 0;
1907
1908 unit[i].track = -1;
1909 }
1910
1911 timer_setup(&post_write_timer, post_write_callback, 0);
1912 post_write_timer.expires = 0;
1913
1914 for (i = 0; i < 128; i++)
1915 mfmdecode[i]=255;
1916 for (i = 0; i < 16; i++)
1917 mfmdecode[mfmencode[i]]=i;
1918
1919 /* make sure that disk DMA is enabled */
1920 custom.dmacon = DMAF_SETCLR | DMAF_DISK;
1921
1922 /* init ms timer */
1923 ciaa.crb = 8; /* one-shot, stop */
1924 return 0;
1925
1926 out_probe:
1927 free_irq(IRQ_AMIGA_CIAA_TB, NULL);
1928 out_irq2:
1929 free_irq(IRQ_AMIGA_DSKBLK, NULL);
1930 out_irq:
1931 amiga_chip_free(raw_buf);
1932 out_blkdev:
1933 unregister_blkdev(FLOPPY_MAJOR,"fd");
1934 return ret;
1935 }
1936
1937 static struct platform_driver amiga_floppy_driver = {
1938 .driver = {
1939 .name = "amiga-floppy",
1940 },
1941 };
1942
amiga_floppy_init(void)1943 static int __init amiga_floppy_init(void)
1944 {
1945 return platform_driver_probe(&amiga_floppy_driver, amiga_floppy_probe);
1946 }
1947
1948 module_init(amiga_floppy_init);
1949
1950 #ifndef MODULE
amiga_floppy_setup(char * str)1951 static int __init amiga_floppy_setup (char *str)
1952 {
1953 int n;
1954 if (!MACH_IS_AMIGA)
1955 return 0;
1956 if (!get_option(&str, &n))
1957 return 0;
1958 printk (KERN_INFO "amiflop: Setting default df0 to %x\n", n);
1959 fd_def_df0 = n;
1960 return 1;
1961 }
1962
1963 __setup("floppy=", amiga_floppy_setup);
1964 #endif
1965
1966 MODULE_ALIAS("platform:amiga-floppy");
1967