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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[net-next-2.6.git] / drivers / block / amiflop.c
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1da177e4
LT		 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>
5a0e3ad6 57#include <linux/slab.h>
1da177e4
LT		 58
59#include <linux/fd.h>
60#include <linux/hdreg.h>
61#include <linux/delay.h>
62#include <linux/init.h>
63#include <linux/amifdreg.h>
64#include <linux/amifd.h>
65#include <linux/buffer_head.h>
66#include <linux/blkdev.h>
67#include <linux/elevator.h>
b5dc7840 68#include <linux/interrupt.h>
1da177e4
LT		 69
70#include <asm/setup.h>
71#include <asm/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 * Error codes
89 */
90#define FD_OK 0 /* operation succeeded */
91#define FD_ERROR -1 /* general error (seek, read, write, etc) */
92#define FD_NOUNIT 1 /* unit does not exist */
93#define FD_UNITBUSY 2 /* unit already active */
94#define FD_NOTACTIVE 3 /* unit is not active */
95#define FD_NOTREADY 4 /* unit is not ready (motor not on/no disk) */
96
97#define MFM_NOSYNC 1
98#define MFM_HEADER 2
99#define MFM_DATA 3
100#define MFM_TRACK 4
101
102/*
103 * Floppy ID values
104 */
105#define FD_NODRIVE 0x00000000 /* response when no unit is present */
106#define FD_DD_3 0xffffffff /* double-density 3.5" (880K) drive */
107#define FD_HD_3 0x55555555 /* high-density 3.5" (1760K) drive */
108#define FD_DD_5 0xaaaaaaaa /* double-density 5.25" (440K) drive */
109
110static unsigned long int fd_def_df0 = FD_DD_3; /* default for df0 if it doesn't identify */
111
112module_param(fd_def_df0, ulong, 0);
113MODULE_LICENSE("GPL");
114
115static struct request_queue *floppy_queue;
1da177e4
LT		 116
117/*
118 * Macros
119 */
120#define MOTOR_ON (ciab.prb &= ~DSKMOTOR)
121#define MOTOR_OFF (ciab.prb |= DSKMOTOR)
122#define SELECT(mask) (ciab.prb &= ~mask)
123#define DESELECT(mask) (ciab.prb |= mask)
124#define SELMASK(drive) (1 << (3 + (drive & 3)))
125
126static struct fd_drive_type drive_types[] = {
127/* code name tr he rdsz wrsz sm pc1 pc2 sd st st*/
128/* warning: times are now in milliseconds (ms) */
129{ FD_DD_3, "DD 3.5", 80, 2, 14716, 13630, 1, 80,161, 3, 18, 1},
130{ FD_HD_3, "HD 3.5", 80, 2, 28344, 27258, 2, 80,161, 3, 18, 1},
131{ FD_DD_5, "DD 5.25", 40, 2, 14716, 13630, 1, 40, 81, 6, 30, 2},
132{ FD_NODRIVE, "No Drive", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
133};
945f390f 134static int num_dr_types = ARRAY_SIZE(drive_types);
1da177e4
LT		 135
136static int amiga_read(int), dos_read(int);
137static void amiga_write(int), dos_write(int);
138static struct fd_data_type data_types[] = {
139 { "Amiga", 11 , amiga_read, amiga_write},
140 { "MS-Dos", 9, dos_read, dos_write}
141};
142
143/* current info on each unit */
144static struct amiga_floppy_struct unit[FD_MAX_UNITS];
145
146static struct timer_list flush_track_timer[FD_MAX_UNITS];
147static struct timer_list post_write_timer;
148static struct timer_list motor_on_timer;
149static struct timer_list motor_off_timer[FD_MAX_UNITS];
150static int on_attempts;
151
152/* Synchronization of FDC access */
153/* request loop (trackbuffer) */
154static volatile int fdc_busy = -1;
155static volatile int fdc_nested;
156static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
157
6d0be946 158static DECLARE_COMPLETION(motor_on_completion);
1da177e4
LT		 159
160static volatile int selected = -1; /* currently selected drive */
161
162static int writepending;
163static int writefromint;
164static char *raw_buf;
165
166static DEFINE_SPINLOCK(amiflop_lock);
167
168#define RAW_BUF_SIZE 30000 /* size of raw disk data */
169
170/*
171 * These are global variables, as that's the easiest way to give
172 * information to interrupts. They are the data used for the current
173 * request.
174 */
175static volatile char block_flag;
176static DECLARE_WAIT_QUEUE_HEAD(wait_fd_block);
177
178/* MS-Dos MFM Coding tables (should go quick and easy) */
179static unsigned char mfmencode[16]={
180 0x2a, 0x29, 0x24, 0x25, 0x12, 0x11, 0x14, 0x15,
181 0x4a, 0x49, 0x44, 0x45, 0x52, 0x51, 0x54, 0x55
182};
183static unsigned char mfmdecode[128];
184
185/* floppy internal millisecond timer stuff */
6d0be946 186static DECLARE_COMPLETION(ms_wait_completion);
1da177e4
LT		 187#define MS_TICKS ((amiga_eclock+50)/1000)
188
189/*
190 * Note that MAX_ERRORS=X doesn't imply that we retry every bad read
191 * max X times - some types of errors increase the errorcount by 2 or
192 * even 3, so we might actually retry only X/2 times before giving up.
193 */
194#define MAX_ERRORS 12
195
b4290a23
AV		 196#define custom amiga_custom
197
1da177e4
LT		 198/* Prevent "aliased" accesses. */
199static int fd_ref[4] = { 0,0,0,0 };
200static int fd_device[4] = { 0, 0, 0, 0 };
201
202/*
203 * Here come the actual hardware access and helper functions.
204 * They are not reentrant and single threaded because all drives
205 * share the same hardware and the same trackbuffer.
206 */
207
208/* Milliseconds timer */
209
7d12e780 210static irqreturn_t ms_isr(int irq, void *dummy)
1da177e4 211{
6d0be946 212 complete(&ms_wait_completion);
1da177e4
LT		 213 return IRQ_HANDLED;
214}
215
216/* all waits are queued up
217 A more generic routine would do a schedule a la timer.device */
218static void ms_delay(int ms)
219{
1da177e4 220 int ticks;
6d0be946
AB		 221 static DEFINE_MUTEX(mutex);
222
1da177e4 223 if (ms > 0) {
6d0be946 224 mutex_lock(&mutex);
1da177e4
LT		 225 ticks = MS_TICKS*ms-1;
226 ciaa.tblo=ticks%256;
227 ciaa.tbhi=ticks/256;
228 ciaa.crb=0x19; /*count eclock, force load, one-shoot, start */
6d0be946
AB		 229 wait_for_completion(&ms_wait_completion);
230 mutex_unlock(&mutex);
1da177e4
LT		 231 }
232}
233
234/* Hardware semaphore */
235
236/* returns true when we would get the semaphore */
237static inline int try_fdc(int drive)
238{
239 drive &= 3;
240 return ((fdc_busy < 0) || (fdc_busy == drive));
241}
242
243static void get_fdc(int drive)
244{
245 unsigned long flags;
246
247 drive &= 3;
248#ifdef DEBUG
249 printk("get_fdc: drive %d fdc_busy %d fdc_nested %d\n",drive,fdc_busy,fdc_nested);
250#endif
251 local_irq_save(flags);
6d0be946 252 wait_event(fdc_wait, try_fdc(drive));
1da177e4
LT		 253 fdc_busy = drive;
254 fdc_nested++;
255 local_irq_restore(flags);
256}
257
258static inline void rel_fdc(void)
259{
260#ifdef DEBUG
261 if (fdc_nested == 0)
262 printk("fd: unmatched rel_fdc\n");
263 printk("rel_fdc: fdc_busy %d fdc_nested %d\n",fdc_busy,fdc_nested);
264#endif
265 fdc_nested--;
266 if (fdc_nested == 0) {
267 fdc_busy = -1;
268 wake_up(&fdc_wait);
269 }
270}
271
272static void fd_select (int drive)
273{
274 unsigned char prb = ~0;
275
276 drive&=3;
277#ifdef DEBUG
278 printk("selecting %d\n",drive);
279#endif
280 if (drive == selected)
281 return;
282 get_fdc(drive);
283 selected = drive;
284
285 if (unit[drive].track % 2 != 0)
286 prb &= ~DSKSIDE;
287 if (unit[drive].motor == 1)
288 prb &= ~DSKMOTOR;
289 ciab.prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
290 ciab.prb = prb;
291 prb &= ~SELMASK(drive);
292 ciab.prb = prb;
293 rel_fdc();
294}
295
296static void fd_deselect (int drive)
297{
298 unsigned char prb;
299 unsigned long flags;
300
301 drive&=3;
302#ifdef DEBUG
303 printk("deselecting %d\n",drive);
304#endif
305 if (drive != selected) {
306 printk(KERN_WARNING "Deselecting drive %d while %d was selected!\n",drive,selected);
307 return;
308 }
309
310 get_fdc(drive);
311 local_irq_save(flags);
312
313 selected = -1;
314
315 prb = ciab.prb;
316 prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
317 ciab.prb = prb;
318
319 local_irq_restore (flags);
320 rel_fdc();
321
322}
323
324static void motor_on_callback(unsigned long nr)
325{
326 if (!(ciaa.pra & DSKRDY) || --on_attempts == 0) {
6d0be946 327 complete_all(&motor_on_completion);
1da177e4
LT		 328 } else {
329 motor_on_timer.expires = jiffies + HZ/10;
330 add_timer(&motor_on_timer);
331 }
332}
333
334static int fd_motor_on(int nr)
335{
336 nr &= 3;
337
338 del_timer(motor_off_timer + nr);
339
340 if (!unit[nr].motor) {
341 unit[nr].motor = 1;
342 fd_select(nr);
343
6d0be946 344 INIT_COMPLETION(motor_on_completion);
1da177e4
LT		 345 motor_on_timer.data = nr;
346 mod_timer(&motor_on_timer, jiffies + HZ/2);
347
348 on_attempts = 10;
6d0be946 349 wait_for_completion(&motor_on_completion);
1da177e4
LT		 350 fd_deselect(nr);
351 }
352
353 if (on_attempts == 0) {
354 on_attempts = -1;
355#if 0
356 printk (KERN_ERR "motor_on failed, turning motor off\n");
357 fd_motor_off (nr);
358 return 0;
359#else
360 printk (KERN_WARNING "DSKRDY not set after 1.5 seconds - assuming drive is spinning notwithstanding\n");
361#endif
362 }
363
364 return 1;
365}
366
367static void fd_motor_off(unsigned long drive)
368{
369 long calledfromint;
370#ifdef MODULE
371 long decusecount;
372
373 decusecount = drive & 0x40000000;
374#endif
375 calledfromint = drive & 0x80000000;
376 drive&=3;
377 if (calledfromint && !try_fdc(drive)) {
378 /* We would be blocked in an interrupt, so try again later */
379 motor_off_timer[drive].expires = jiffies + 1;
380 add_timer(motor_off_timer + drive);
381 return;
382 }
383 unit[drive].motor = 0;
384 fd_select(drive);
385 udelay (1);
386 fd_deselect(drive);
387}
388
389static void floppy_off (unsigned int nr)
390{
391 int drive;
392
393 drive = nr & 3;
394 /* called this way it is always from interrupt */
395 motor_off_timer[drive].data = nr | 0x80000000;
396 mod_timer(motor_off_timer + drive, jiffies + 3*HZ);
397}
398
399static int fd_calibrate(int drive)
400{
401 unsigned char prb;
402 int n;
403
404 drive &= 3;
405 get_fdc(drive);
406 if (!fd_motor_on (drive))
407 return 0;
408 fd_select (drive);
409 prb = ciab.prb;
410 prb |= DSKSIDE;
411 prb &= ~DSKDIREC;
412 ciab.prb = prb;
413 for (n = unit[drive].type->tracks/2; n != 0; --n) {
414 if (ciaa.pra & DSKTRACK0)
415 break;
416 prb &= ~DSKSTEP;
417 ciab.prb = prb;
418 prb |= DSKSTEP;
419 udelay (2);
420 ciab.prb = prb;
421 ms_delay(unit[drive].type->step_delay);
422 }
423 ms_delay (unit[drive].type->settle_time);
424 prb |= DSKDIREC;
425 n = unit[drive].type->tracks + 20;
426 for (;;) {
427 prb &= ~DSKSTEP;
428 ciab.prb = prb;
429 prb |= DSKSTEP;
430 udelay (2);
431 ciab.prb = prb;
432 ms_delay(unit[drive].type->step_delay + 1);
433 if ((ciaa.pra & DSKTRACK0) == 0)
434 break;
435 if (--n == 0) {
436 printk (KERN_ERR "fd%d: calibrate failed, turning motor off\n", drive);
437 fd_motor_off (drive);
438 unit[drive].track = -1;
439 rel_fdc();
440 return 0;
441 }
442 }
443 unit[drive].track = 0;
444 ms_delay(unit[drive].type->settle_time);
445
446 rel_fdc();
447 fd_deselect(drive);
448 return 1;
449}
450
451static int fd_seek(int drive, int track)
452{
453 unsigned char prb;
454 int cnt;
455
456#ifdef DEBUG
457 printk("seeking drive %d to track %d\n",drive,track);
458#endif
459 drive &= 3;
460 get_fdc(drive);
461 if (unit[drive].track == track) {
462 rel_fdc();
463 return 1;
464 }
465 if (!fd_motor_on(drive)) {
466 rel_fdc();
467 return 0;
468 }
469 if (unit[drive].track < 0 && !fd_calibrate(drive)) {
470 rel_fdc();
471 return 0;
472 }
473
474 fd_select (drive);
475 cnt = unit[drive].track/2 - track/2;
476 prb = ciab.prb;
477 prb |= DSKSIDE | DSKDIREC;
478 if (track % 2 != 0)
479 prb &= ~DSKSIDE;
480 if (cnt < 0) {
481 cnt = - cnt;
482 prb &= ~DSKDIREC;
483 }
484 ciab.prb = prb;
485 if (track % 2 != unit[drive].track % 2)
486 ms_delay (unit[drive].type->side_time);
487 unit[drive].track = track;
488 if (cnt == 0) {
489 rel_fdc();
490 fd_deselect(drive);
491 return 1;
492 }
493 do {
494 prb &= ~DSKSTEP;
495 ciab.prb = prb;
496 prb |= DSKSTEP;
497 udelay (1);
498 ciab.prb = prb;
499 ms_delay (unit[drive].type->step_delay);
500 } while (--cnt != 0);
501 ms_delay (unit[drive].type->settle_time);
502
503 rel_fdc();
504 fd_deselect(drive);
505 return 1;
506}
507
508static unsigned long fd_get_drive_id(int drive)
509{
510 int i;
511 ulong id = 0;
512
513 drive&=3;
514 get_fdc(drive);
515 /* set up for ID */
516 MOTOR_ON;
517 udelay(2);
518 SELECT(SELMASK(drive));
519 udelay(2);
520 DESELECT(SELMASK(drive));
521 udelay(2);
522 MOTOR_OFF;
523 udelay(2);
524 SELECT(SELMASK(drive));
525 udelay(2);
526 DESELECT(SELMASK(drive));
527 udelay(2);
528
529 /* loop and read disk ID */
530 for (i=0; i<32; i++) {
531 SELECT(SELMASK(drive));
532 udelay(2);
533
534 /* read and store value of DSKRDY */
535 id <<= 1;
536 id |= (ciaa.pra & DSKRDY) ? 0 : 1; /* cia regs are low-active! */
537
538 DESELECT(SELMASK(drive));
539 }
540
541 rel_fdc();
542
543 /*
544 * RB: At least A500/A2000's df0: don't identify themselves.
545 * As every (real) Amiga has at least a 3.5" DD drive as df0:
546 * we default to that if df0: doesn't identify as a certain
547 * type.
548 */
549 if(drive == 0 && id == FD_NODRIVE)
550 {
551 id = fd_def_df0;
552 printk(KERN_NOTICE "fd: drive 0 didn't identify, setting default %08lx\n", (ulong)fd_def_df0);
553 }
554 /* return the ID value */
555 return (id);
556}
557
7d12e780 558static irqreturn_t fd_block_done(int irq, void *dummy)
1da177e4
LT		 559{
560 if (block_flag)
561 custom.dsklen = 0x4000;
562
563 if (block_flag == 2) { /* writing */
564 writepending = 2;
565 post_write_timer.expires = jiffies + 1; /* at least 2 ms */
566 post_write_timer.data = selected;
567 add_timer(&post_write_timer);
568 }
569 else { /* reading */
570 block_flag = 0;
571 wake_up (&wait_fd_block);
572 }
573 return IRQ_HANDLED;
574}
575
576static void raw_read(int drive)
577{
578 drive&=3;
579 get_fdc(drive);
6d0be946 580 wait_event(wait_fd_block, !block_flag);
1da177e4
LT		 581 fd_select(drive);
582 /* setup adkcon bits correctly */
583 custom.adkcon = ADK_MSBSYNC;
584 custom.adkcon = ADK_SETCLR|ADK_WORDSYNC|ADK_FAST;
585
586 custom.dsksync = MFM_SYNC;
587
588 custom.dsklen = 0;
589 custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf);
590 custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN;
591 custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN;
592
593 block_flag = 1;
594
6d0be946 595 wait_event(wait_fd_block, !block_flag);
1da177e4
LT		 596
597 custom.dsklen = 0;
598 fd_deselect(drive);
599 rel_fdc();
600}
601
602static int raw_write(int drive)
603{
604 ushort adk;
605
606 drive&=3;
607 get_fdc(drive); /* corresponds to rel_fdc() in post_write() */
608 if ((ciaa.pra & DSKPROT) == 0) {
609 rel_fdc();
610 return 0;
611 }
6d0be946 612 wait_event(wait_fd_block, !block_flag);
1da177e4
LT		 613 fd_select(drive);
614 /* clear adkcon bits */
615 custom.adkcon = ADK_PRECOMP1|ADK_PRECOMP0|ADK_WORDSYNC|ADK_MSBSYNC;
616 /* set appropriate adkcon bits */
617 adk = ADK_SETCLR|ADK_FAST;
618 if ((ulong)unit[drive].track >= unit[drive].type->precomp2)
619 adk |= ADK_PRECOMP1;
620 else if ((ulong)unit[drive].track >= unit[drive].type->precomp1)
621 adk |= ADK_PRECOMP0;
622 custom.adkcon = adk;
623
624 custom.dsklen = DSKLEN_WRITE;
625 custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf);
626 custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE;
627 custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE;
628
629 block_flag = 2;
630 return 1;
631}
632
633/*
634 * to be called at least 2ms after the write has finished but before any
635 * other access to the hardware.
636 */
637static void post_write (unsigned long drive)
638{
639#ifdef DEBUG
640 printk("post_write for drive %ld\n",drive);
641#endif
642 drive &= 3;
643 custom.dsklen = 0;
644 block_flag = 0;
645 writepending = 0;
646 writefromint = 0;
647 unit[drive].dirty = 0;
648 wake_up(&wait_fd_block);
649 fd_deselect(drive);
650 rel_fdc(); /* corresponds to get_fdc() in raw_write */
651}
652
653
654/*
655 * The following functions are to convert the block contents into raw data
656 * written to disk and vice versa.
657 * (Add other formats here ;-))
658 */
659
660static unsigned long scan_sync(unsigned long raw, unsigned long end)
661{
662 ushort *ptr = (ushort *)raw, *endp = (ushort *)end;
663
664 while (ptr < endp && *ptr++ != 0x4489)
665 ;
666 if (ptr < endp) {
667 while (*ptr == 0x4489 && ptr < endp)
668 ptr++;
669 return (ulong)ptr;
670 }
671 return 0;
672}
673
674static inline unsigned long checksum(unsigned long *addr, int len)
675{
676 unsigned long csum = 0;
677
678 len /= sizeof(*addr);
679 while (len-- > 0)
680 csum ^= *addr++;
681 csum = ((csum>>1) & 0x55555555) ^ (csum & 0x55555555);
682
683 return csum;
684}
685
686static unsigned long decode (unsigned long *data, unsigned long *raw,
687 int len)
688{
689 ulong *odd, *even;
690
691 /* convert length from bytes to longwords */
692 len >>= 2;
693 odd = raw;
694 even = odd + len;
695
696 /* prepare return pointer */
697 raw += len * 2;
698
699 do {
700 *data++ = ((*odd++ & 0x55555555) << 1) | (*even++ & 0x55555555);
701 } while (--len != 0);
702
703 return (ulong)raw;
704}
705
706struct header {
707 unsigned char magic;
708 unsigned char track;
709 unsigned char sect;
710 unsigned char ord;
711 unsigned char labels[16];
712 unsigned long hdrchk;
713 unsigned long datachk;
714};
715
716static int amiga_read(int drive)
717{
718 unsigned long raw;
719 unsigned long end;
720 int scnt;
721 unsigned long csum;
722 struct header hdr;
723
724 drive&=3;
725 raw = (long) raw_buf;
726 end = raw + unit[drive].type->read_size;
727
728 for (scnt = 0;scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) {
729 if (!(raw = scan_sync(raw, end))) {
730 printk (KERN_INFO "can't find sync for sector %d\n", scnt);
731 return MFM_NOSYNC;
732 }
733
734 raw = decode ((ulong *)&hdr.magic, (ulong *)raw, 4);
735 raw = decode ((ulong *)&hdr.labels, (ulong *)raw, 16);
736 raw = decode ((ulong *)&hdr.hdrchk, (ulong *)raw, 4);
737 raw = decode ((ulong *)&hdr.datachk, (ulong *)raw, 4);
738 csum = checksum((ulong *)&hdr,
739 (char *)&hdr.hdrchk-(char *)&hdr);
740
741#ifdef DEBUG
742 printk ("(%x,%d,%d,%d) (%lx,%lx,%lx,%lx) %lx %lx\n",
743 hdr.magic, hdr.track, hdr.sect, hdr.ord,
744 *(ulong *)&hdr.labels[0], *(ulong *)&hdr.labels[4],
745 *(ulong *)&hdr.labels[8], *(ulong *)&hdr.labels[12],
746 hdr.hdrchk, hdr.datachk);
747#endif
748
749 if (hdr.hdrchk != csum) {
750 printk(KERN_INFO "MFM_HEADER: %08lx,%08lx\n", hdr.hdrchk, csum);
751 return MFM_HEADER;
752 }
753
754 /* verify track */
755 if (hdr.track != unit[drive].track) {
756 printk(KERN_INFO "MFM_TRACK: %d, %d\n", hdr.track, unit[drive].track);
757 return MFM_TRACK;
758 }
759
760 raw = decode ((ulong *)(unit[drive].trackbuf + hdr.sect*512),
761 (ulong *)raw, 512);
762 csum = checksum((ulong *)(unit[drive].trackbuf + hdr.sect*512), 512);
763
764 if (hdr.datachk != csum) {
765 printk(KERN_INFO "MFM_DATA: (%x:%d:%d:%d) sc=%d %lx, %lx\n",
766 hdr.magic, hdr.track, hdr.sect, hdr.ord, scnt,
767 hdr.datachk, csum);
768 printk (KERN_INFO "data=(%lx,%lx,%lx,%lx)\n",
769 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[0],
770 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[1],
771 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[2],
772 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[3]);
773 return MFM_DATA;
774 }
775 }
776
777 return 0;
778}
779
780static void encode(unsigned long data, unsigned long *dest)
781{
782 unsigned long data2;
783
784 data &= 0x55555555;
785 data2 = data ^ 0x55555555;
786 data |= ((data2 >> 1) | 0x80000000) & (data2 << 1);
787
788 if (*(dest - 1) & 0x00000001)
789 data &= 0x7FFFFFFF;
790
791 *dest = data;
792}
793
794static void encode_block(unsigned long *dest, unsigned long *src, int len)
795{
796 int cnt, to_cnt = 0;
797 unsigned long data;
798
799 /* odd bits */
800 for (cnt = 0; cnt < len / 4; cnt++) {
801 data = src[cnt] >> 1;
802 encode(data, dest + to_cnt++);
803 }
804
805 /* even bits */
806 for (cnt = 0; cnt < len / 4; cnt++) {
807 data = src[cnt];
808 encode(data, dest + to_cnt++);
809 }
810}
811
812static unsigned long *putsec(int disk, unsigned long *raw, int cnt)
813{
814 struct header hdr;
815 int i;
816
817 disk&=3;
818 *raw = (raw[-1]&1) ? 0x2AAAAAAA : 0xAAAAAAAA;
819 raw++;
820 *raw++ = 0x44894489;
821
822 hdr.magic = 0xFF;
823 hdr.track = unit[disk].track;
824 hdr.sect = cnt;
825 hdr.ord = unit[disk].dtype->sects * unit[disk].type->sect_mult - cnt;
826 for (i = 0; i < 16; i++)
827 hdr.labels[i] = 0;
828 hdr.hdrchk = checksum((ulong *)&hdr,
829 (char *)&hdr.hdrchk-(char *)&hdr);
830 hdr.datachk = checksum((ulong *)(unit[disk].trackbuf+cnt*512), 512);
831
832 encode_block(raw, (ulong *)&hdr.magic, 4);
833 raw += 2;
834 encode_block(raw, (ulong *)&hdr.labels, 16);
835 raw += 8;
836 encode_block(raw, (ulong *)&hdr.hdrchk, 4);
837 raw += 2;
838 encode_block(raw, (ulong *)&hdr.datachk, 4);
839 raw += 2;
840 encode_block(raw, (ulong *)(unit[disk].trackbuf+cnt*512), 512);
841 raw += 256;
842
843 return raw;
844}
845
846static void amiga_write(int disk)
847{
848 unsigned int cnt;
849 unsigned long *ptr = (unsigned long *)raw_buf;
850
851 disk&=3;
852 /* gap space */
853 for (cnt = 0; cnt < 415 * unit[disk].type->sect_mult; cnt++)
854 *ptr++ = 0xaaaaaaaa;
855
856 /* sectors */
857 for (cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++)
858 ptr = putsec (disk, ptr, cnt);
859 *(ushort *)ptr = (ptr[-1]&1) ? 0x2AA8 : 0xAAA8;
860}
861
862
863struct dos_header {
864 unsigned char track, /* 0-80 */
865 side, /* 0-1 */
866 sec, /* 0-...*/
867 len_desc;/* 2 */
868 unsigned short crc; /* on 68000 we got an alignment problem,
869 but this compiler solves it by adding silently
870 adding a pad byte so data won't fit
871 and this took about 3h to discover.... */
872 unsigned char gap1[22]; /* for longword-alignedness (0x4e) */
873};
874
875/* crc routines are borrowed from the messydos-handler */
876
877/* excerpt from the messydos-device
878; The CRC is computed not only over the actual data, but including
879; the SYNC mark (3 * $a1) and the 'ID/DATA - Address Mark' ($fe/$fb).
880; As we don't read or encode these fields into our buffers, we have to
881; preload the registers containing the CRC with the values they would have
882; after stepping over these fields.
883;
884; How CRCs "really" work:
885;
886; First, you should regard a bitstring as a series of coefficients of
887; polynomials. We calculate with these polynomials in modulo-2
888; arithmetic, in which both add and subtract are done the same as
889; exclusive-or. Now, we modify our data (a very long polynomial) in
890; such a way that it becomes divisible by the CCITT-standard 16-bit
891; 16 12 5
892; polynomial: x + x + x + 1, represented by $11021. The easiest
893; way to do this would be to multiply (using proper arithmetic) our
894; datablock with $11021. So we have:
895; data * $11021 =
896; data * ($10000 + $1021) =
897; data * $10000 + data * $1021
898; The left part of this is simple: Just add two 0 bytes. But then
899; the right part (data $1021) remains difficult and even could have
900; a carry into the left part. The solution is to use a modified
901; multiplication, which has a result that is not correct, but with
902; a difference of any multiple of $11021. We then only need to keep
903; the 16 least significant bits of the result.
904;
905; The following algorithm does this for us:
906;
907; unsigned char *data, c, crclo, crchi;
908; while (not done) {
909; c = *data++ + crchi;
910; crchi = (@ c) >> 8 + crclo;
911; crclo = @ c;
912; }
913;
914; Remember, + is done with EOR, the @ operator is in two tables (high
915; and low byte separately), which is calculated as
916;
917; $1021 * (c & $F0)
918; xor $1021 * (c & $0F)
919; xor $1021 * (c >> 4) (* is regular multiplication)
920;
921;
922; Anyway, the end result is the same as the remainder of the division of
923; the data by $11021. I am afraid I need to study theory a bit more...
924
925
926my only works was to code this from manx to C....
927
928*/
929
930static ushort dos_crc(void * data_a3, int data_d0, int data_d1, int data_d3)
931{
932 static unsigned char CRCTable1[] = {
933 0x00,0x10,0x20,0x30,0x40,0x50,0x60,0x70,0x81,0x91,0xa1,0xb1,0xc1,0xd1,0xe1,0xf1,
934 0x12,0x02,0x32,0x22,0x52,0x42,0x72,0x62,0x93,0x83,0xb3,0xa3,0xd3,0xc3,0xf3,0xe3,
935 0x24,0x34,0x04,0x14,0x64,0x74,0x44,0x54,0xa5,0xb5,0x85,0x95,0xe5,0xf5,0xc5,0xd5,
936 0x36,0x26,0x16,0x06,0x76,0x66,0x56,0x46,0xb7,0xa7,0x97,0x87,0xf7,0xe7,0xd7,0xc7,
937 0x48,0x58,0x68,0x78,0x08,0x18,0x28,0x38,0xc9,0xd9,0xe9,0xf9,0x89,0x99,0xa9,0xb9,
938 0x5a,0x4a,0x7a,0x6a,0x1a,0x0a,0x3a,0x2a,0xdb,0xcb,0xfb,0xeb,0x9b,0x8b,0xbb,0xab,
939 0x6c,0x7c,0x4c,0x5c,0x2c,0x3c,0x0c,0x1c,0xed,0xfd,0xcd,0xdd,0xad,0xbd,0x8d,0x9d,
940 0x7e,0x6e,0x5e,0x4e,0x3e,0x2e,0x1e,0x0e,0xff,0xef,0xdf,0xcf,0xbf,0xaf,0x9f,0x8f,
941 0x91,0x81,0xb1,0xa1,0xd1,0xc1,0xf1,0xe1,0x10,0x00,0x30,0x20,0x50,0x40,0x70,0x60,
942 0x83,0x93,0xa3,0xb3,0xc3,0xd3,0xe3,0xf3,0x02,0x12,0x22,0x32,0x42,0x52,0x62,0x72,
943 0xb5,0xa5,0x95,0x85,0xf5,0xe5,0xd5,0xc5,0x34,0x24,0x14,0x04,0x74,0x64,0x54,0x44,
944 0xa7,0xb7,0x87,0x97,0xe7,0xf7,0xc7,0xd7,0x26,0x36,0x06,0x16,0x66,0x76,0x46,0x56,
945 0xd9,0xc9,0xf9,0xe9,0x99,0x89,0xb9,0xa9,0x58,0x48,0x78,0x68,0x18,0x08,0x38,0x28,
946 0xcb,0xdb,0xeb,0xfb,0x8b,0x9b,0xab,0xbb,0x4a,0x5a,0x6a,0x7a,0x0a,0x1a,0x2a,0x3a,
947 0xfd,0xed,0xdd,0xcd,0xbd,0xad,0x9d,0x8d,0x7c,0x6c,0x5c,0x4c,0x3c,0x2c,0x1c,0x0c,
948 0xef,0xff,0xcf,0xdf,0xaf,0xbf,0x8f,0x9f,0x6e,0x7e,0x4e,0x5e,0x2e,0x3e,0x0e,0x1e
949 };
950
951 static unsigned char CRCTable2[] = {
952 0x00,0x21,0x42,0x63,0x84,0xa5,0xc6,0xe7,0x08,0x29,0x4a,0x6b,0x8c,0xad,0xce,0xef,
953 0x31,0x10,0x73,0x52,0xb5,0x94,0xf7,0xd6,0x39,0x18,0x7b,0x5a,0xbd,0x9c,0xff,0xde,
954 0x62,0x43,0x20,0x01,0xe6,0xc7,0xa4,0x85,0x6a,0x4b,0x28,0x09,0xee,0xcf,0xac,0x8d,
955 0x53,0x72,0x11,0x30,0xd7,0xf6,0x95,0xb4,0x5b,0x7a,0x19,0x38,0xdf,0xfe,0x9d,0xbc,
956 0xc4,0xe5,0x86,0xa7,0x40,0x61,0x02,0x23,0xcc,0xed,0x8e,0xaf,0x48,0x69,0x0a,0x2b,
957 0xf5,0xd4,0xb7,0x96,0x71,0x50,0x33,0x12,0xfd,0xdc,0xbf,0x9e,0x79,0x58,0x3b,0x1a,
958 0xa6,0x87,0xe4,0xc5,0x22,0x03,0x60,0x41,0xae,0x8f,0xec,0xcd,0x2a,0x0b,0x68,0x49,
959 0x97,0xb6,0xd5,0xf4,0x13,0x32,0x51,0x70,0x9f,0xbe,0xdd,0xfc,0x1b,0x3a,0x59,0x78,
960 0x88,0xa9,0xca,0xeb,0x0c,0x2d,0x4e,0x6f,0x80,0xa1,0xc2,0xe3,0x04,0x25,0x46,0x67,
961 0xb9,0x98,0xfb,0xda,0x3d,0x1c,0x7f,0x5e,0xb1,0x90,0xf3,0xd2,0x35,0x14,0x77,0x56,
962 0xea,0xcb,0xa8,0x89,0x6e,0x4f,0x2c,0x0d,0xe2,0xc3,0xa0,0x81,0x66,0x47,0x24,0x05,
963 0xdb,0xfa,0x99,0xb8,0x5f,0x7e,0x1d,0x3c,0xd3,0xf2,0x91,0xb0,0x57,0x76,0x15,0x34,
964 0x4c,0x6d,0x0e,0x2f,0xc8,0xe9,0x8a,0xab,0x44,0x65,0x06,0x27,0xc0,0xe1,0x82,0xa3,
965 0x7d,0x5c,0x3f,0x1e,0xf9,0xd8,0xbb,0x9a,0x75,0x54,0x37,0x16,0xf1,0xd0,0xb3,0x92,
966 0x2e,0x0f,0x6c,0x4d,0xaa,0x8b,0xe8,0xc9,0x26,0x07,0x64,0x45,0xa2,0x83,0xe0,0xc1,
967 0x1f,0x3e,0x5d,0x7c,0x9b,0xba,0xd9,0xf8,0x17,0x36,0x55,0x74,0x93,0xb2,0xd1,0xf0
968 };
969
970/* look at the asm-code - what looks in C a bit strange is almost as good as handmade */
971 register int i;
972 register unsigned char *CRCT1, *CRCT2, *data, c, crch, crcl;
973
974 CRCT1=CRCTable1;
975 CRCT2=CRCTable2;
976 data=data_a3;
977 crcl=data_d1;
978 crch=data_d0;
979 for (i=data_d3; i>=0; i--) {
980 c = (*data++) ^ crch;
981 crch = CRCT1[c] ^ crcl;
982 crcl = CRCT2[c];
983 }
984 return (crch<<8)|crcl;
985}
986
987static inline ushort dos_hdr_crc (struct dos_header *hdr)
988{
989 return dos_crc(&(hdr->track), 0xb2, 0x30, 3); /* precomputed magic */
990}
991
992static inline ushort dos_data_crc(unsigned char *data)
993{
994 return dos_crc(data, 0xe2, 0x95 ,511); /* precomputed magic */
995}
996
997static inline unsigned char dos_decode_byte(ushort word)
998{
999 register ushort w2;
1000 register unsigned char byte;
1001 register unsigned char *dec = mfmdecode;
1002
1003 w2=word;
1004 w2>>=8;
1005 w2&=127;
1006 byte = dec[w2];
1007 byte <<= 4;
1008 w2 = word & 127;
1009 byte |= dec[w2];
1010 return byte;
1011}
1012
1013static unsigned long dos_decode(unsigned char *data, unsigned short *raw, int len)
1014{
1015 int i;
1016
1017 for (i = 0; i < len; i++)
1018 *data++=dos_decode_byte(*raw++);
1019 return ((ulong)raw);
1020}
1021
1022#ifdef DEBUG
1023static void dbg(unsigned long ptr)
1024{
1025 printk("raw data @%08lx: %08lx, %08lx ,%08lx, %08lx\n", ptr,
1026 ((ulong *)ptr)[0], ((ulong *)ptr)[1],
1027 ((ulong *)ptr)[2], ((ulong *)ptr)[3]);
1028}
1029#endif
1030
1031static int dos_read(int drive)
1032{
1033 unsigned long end;
1034 unsigned long raw;
1035 int scnt;
1036 unsigned short crc,data_crc[2];
1037 struct dos_header hdr;
1038
1039 drive&=3;
1040 raw = (long) raw_buf;
1041 end = raw + unit[drive].type->read_size;
1042
1043 for (scnt=0; scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) {
1044 do { /* search for the right sync of each sec-hdr */
1045 if (!(raw = scan_sync (raw, end))) {
1046 printk(KERN_INFO "dos_read: no hdr sync on "
1047 "track %d, unit %d for sector %d\n",
1048 unit[drive].track,drive,scnt);
1049 return MFM_NOSYNC;
1050 }
1051#ifdef DEBUG
1052 dbg(raw);
1053#endif
1054 } while (*((ushort *)raw)!=0x5554); /* loop usually only once done */
1055 raw+=2; /* skip over headermark */
1056 raw = dos_decode((unsigned char *)&hdr,(ushort *) raw,8);
1057 crc = dos_hdr_crc(&hdr);
1058
1059#ifdef DEBUG
1060 printk("(%3d,%d,%2d,%d) %x\n", hdr.track, hdr.side,
1061 hdr.sec, hdr.len_desc, hdr.crc);
1062#endif
1063
1064 if (crc != hdr.crc) {
1065 printk(KERN_INFO "dos_read: MFM_HEADER %04x,%04x\n",
1066 hdr.crc, crc);
1067 return MFM_HEADER;
1068 }
1069 if (hdr.track != unit[drive].track/unit[drive].type->heads) {
1070 printk(KERN_INFO "dos_read: MFM_TRACK %d, %d\n",
1071 hdr.track,
1072 unit[drive].track/unit[drive].type->heads);
1073 return MFM_TRACK;
1074 }
1075
1076 if (hdr.side != unit[drive].track%unit[drive].type->heads) {
1077 printk(KERN_INFO "dos_read: MFM_SIDE %d, %d\n",
1078 hdr.side,
1079 unit[drive].track%unit[drive].type->heads);
1080 return MFM_TRACK;
1081 }
1082
1083 if (hdr.len_desc != 2) {
1084 printk(KERN_INFO "dos_read: unknown sector len "
1085 "descriptor %d\n", hdr.len_desc);
1086 return MFM_DATA;
1087 }
1088#ifdef DEBUG
1089 printk("hdr accepted\n");
1090#endif
1091 if (!(raw = scan_sync (raw, end))) {
1092 printk(KERN_INFO "dos_read: no data sync on track "
1093 "%d, unit %d for sector%d, disk sector %d\n",
1094 unit[drive].track, drive, scnt, hdr.sec);
1095 return MFM_NOSYNC;
1096 }
1097#ifdef DEBUG
1098 dbg(raw);
1099#endif
1100
1101 if (*((ushort *)raw)!=0x5545) {
1102 printk(KERN_INFO "dos_read: no data mark after "
1103 "sync (%d,%d,%d,%d) sc=%d\n",
1104 hdr.track,hdr.side,hdr.sec,hdr.len_desc,scnt);
1105 return MFM_NOSYNC;
1106 }
1107
1108 raw+=2; /* skip data mark (included in checksum) */
1109 raw = dos_decode((unsigned char *)(unit[drive].trackbuf + (hdr.sec - 1) * 512), (ushort *) raw, 512);
1110 raw = dos_decode((unsigned char *)data_crc,(ushort *) raw,4);
1111 crc = dos_data_crc(unit[drive].trackbuf + (hdr.sec - 1) * 512);
1112
1113 if (crc != data_crc[0]) {
1114 printk(KERN_INFO "dos_read: MFM_DATA (%d,%d,%d,%d) "
1115 "sc=%d, %x %x\n", hdr.track, hdr.side,
1116 hdr.sec, hdr.len_desc, scnt,data_crc[0], crc);
1117 printk(KERN_INFO "data=(%lx,%lx,%lx,%lx,...)\n",
1118 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[0],
1119 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[1],
1120 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[2],
1121 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[3]);
1122 return MFM_DATA;
1123 }
1124 }
1125 return 0;
1126}
1127
1128static inline ushort dos_encode_byte(unsigned char byte)
1129{
1130 register unsigned char *enc, b2, b1;
1131 register ushort word;
1132
1133 enc=mfmencode;
1134 b1=byte;
1135 b2=b1>>4;
1136 b1&=15;
1137 word=enc[b2] <<8 | enc [b1];
1138 return (word|((word&(256|64)) ? 0: 128));
1139}
1140
1141static void dos_encode_block(ushort *dest, unsigned char *src, int len)
1142{
1143 int i;
1144
1145 for (i = 0; i < len; i++) {
1146 *dest=dos_encode_byte(*src++);
1147 *dest|=((dest[-1]&1)||(*dest&0x4000))? 0: 0x8000;
1148 dest++;
1149 }
1150}
1151
1152static unsigned long *ms_putsec(int drive, unsigned long *raw, int cnt)
1153{
1154 static struct dos_header hdr={0,0,0,2,0,
1155 {78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78}};
1156 int i;
1157 static ushort crc[2]={0,0x4e4e};
1158
1159 drive&=3;
1160/* id gap 1 */
1161/* the MFM word before is always 9254 */
1162 for(i=0;i<6;i++)
1163 *raw++=0xaaaaaaaa;
1164/* 3 sync + 1 headermark */
1165 *raw++=0x44894489;
1166 *raw++=0x44895554;
1167
1168/* fill in the variable parts of the header */
1169 hdr.track=unit[drive].track/unit[drive].type->heads;
1170 hdr.side=unit[drive].track%unit[drive].type->heads;
1171 hdr.sec=cnt+1;
1172 hdr.crc=dos_hdr_crc(&hdr);
1173
1174/* header (without "magic") and id gap 2*/
1175 dos_encode_block((ushort *)raw,(unsigned char *) &hdr.track,28);
1176 raw+=14;
1177
1178/*id gap 3 */
1179 for(i=0;i<6;i++)
1180 *raw++=0xaaaaaaaa;
1181
1182/* 3 syncs and 1 datamark */
1183 *raw++=0x44894489;
1184 *raw++=0x44895545;
1185
1186/* data */
1187 dos_encode_block((ushort *)raw,
1188 (unsigned char *)unit[drive].trackbuf+cnt*512,512);
1189 raw+=256;
1190
1191/*data crc + jd's special gap (long words :-/) */
1192 crc[0]=dos_data_crc(unit[drive].trackbuf+cnt*512);
1193 dos_encode_block((ushort *) raw,(unsigned char *)crc,4);
1194 raw+=2;
1195
1196/* data gap */
1197 for(i=0;i<38;i++)
1198 *raw++=0x92549254;
1199
1200 return raw; /* wrote 652 MFM words */
1201}
1202
1203static void dos_write(int disk)
1204{
1205 int cnt;
1206 unsigned long raw = (unsigned long) raw_buf;
1207 unsigned long *ptr=(unsigned long *)raw;
1208
1209 disk&=3;
1210/* really gap4 + indexgap , but we write it first and round it up */
1211 for (cnt=0;cnt<425;cnt++)
1212 *ptr++=0x92549254;
1213
1214/* the following is just guessed */
1215 if (unit[disk].type->sect_mult==2) /* check for HD-Disks */
1216 for(cnt=0;cnt<473;cnt++)
1217 *ptr++=0x92549254;
1218
1219/* now the index marks...*/
1220 for (cnt=0;cnt<20;cnt++)
1221 *ptr++=0x92549254;
1222 for (cnt=0;cnt<6;cnt++)
1223 *ptr++=0xaaaaaaaa;
1224 *ptr++=0x52245224;
1225 *ptr++=0x52245552;
1226 for (cnt=0;cnt<20;cnt++)
1227 *ptr++=0x92549254;
1228
1229/* sectors */
1230 for(cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++)
1231 ptr=ms_putsec(disk,ptr,cnt);
1232
1233 *(ushort *)ptr = 0xaaa8; /* MFM word before is always 0x9254 */
1234}
1235
1236/*
1237 * Here comes the high level stuff (i.e. the filesystem interface)
1238 * and helper functions.
1239 * Normally this should be the only part that has to be adapted to
1240 * different kernel versions.
1241 */
1242
1243/* FIXME: this assumes the drive is still spinning -
1244 * which is only true if we complete writing a track within three seconds
1245 */
1246static void flush_track_callback(unsigned long nr)
1247{
1248 nr&=3;
1249 writefromint = 1;
1250 if (!try_fdc(nr)) {
1251 /* we might block in an interrupt, so try again later */
1252 flush_track_timer[nr].expires = jiffies + 1;
1253 add_timer(flush_track_timer + nr);
1254 return;
1255 }
1256 get_fdc(nr);
1257 (*unit[nr].dtype->write_fkt)(nr);
1258 if (!raw_write(nr)) {
1259 printk (KERN_NOTICE "floppy disk write protected\n");
1260 writefromint = 0;
1261 writepending = 0;
1262 }
1263 rel_fdc();
1264}
1265
1266static int non_int_flush_track (unsigned long nr)
1267{
1268 unsigned long flags;
1269
1270 nr&=3;
1271 writefromint = 0;
1272 del_timer(&post_write_timer);
1273 get_fdc(nr);
1274 if (!fd_motor_on(nr)) {
1275 writepending = 0;
1276 rel_fdc();
1277 return 0;
1278 }
1279 local_irq_save(flags);
1280 if (writepending != 2) {
1281 local_irq_restore(flags);
1282 (*unit[nr].dtype->write_fkt)(nr);
1283 if (!raw_write(nr)) {
1284 printk (KERN_NOTICE "floppy disk write protected "
1285 "in write!\n");
1286 writepending = 0;
1287 return 0;
1288 }
6d0be946 1289 wait_event(wait_fd_block, block_flag != 2);
1da177e4
LT		 1290 }
1291 else {
1292 local_irq_restore(flags);
1293 ms_delay(2); /* 2 ms post_write delay */
1294 post_write(nr);
1295 }
1296 rel_fdc();
1297 return 1;
1298}
1299
1300static int get_track(int drive, int track)
1301{
1302 int error, errcnt;
1303
1304 drive&=3;
1305 if (unit[drive].track == track)
1306 return 0;
1307 get_fdc(drive);
1308 if (!fd_motor_on(drive)) {
1309 rel_fdc();
1310 return -1;
1311 }
1312
1313 if (unit[drive].dirty == 1) {
1314 del_timer (flush_track_timer + drive);
1315 non_int_flush_track (drive);
1316 }
1317 errcnt = 0;
1318 while (errcnt < MAX_ERRORS) {
1319 if (!fd_seek(drive, track))
1320 return -1;
1321 raw_read(drive);
1322 error = (*unit[drive].dtype->read_fkt)(drive);
1323 if (error == 0) {
1324 rel_fdc();
1325 return 0;
1326 }
1327 /* Read Error Handling: recalibrate and try again */
1328 unit[drive].track = -1;
1329 errcnt++;
1330 }
1331 rel_fdc();
1332 return -1;
1333}
1334
1335static void redo_fd_request(void)
1336{
9e31bebe 1337 struct request *rq;
1da177e4
LT		 1338 unsigned int cnt, block, track, sector;
1339 int drive;
1340 struct amiga_floppy_struct *floppy;
1341 char *data;
1342 unsigned long flags;
9e31bebe 1343 int err;
1da177e4 1344
9e31bebe 1345next_req:
9934c8c0 1346 rq = blk_fetch_request(floppy_queue);
9e31bebe 1347 if (!rq) {
1da177e4
LT		 1348 /* Nothing left to do */
1349 return;
1350 }
1351
9e31bebe 1352 floppy = rq->rq_disk->private_data;
1da177e4
LT		 1353 drive = floppy - unit;
1354
9e31bebe 1355next_segment:
1da177e4 1356 /* Here someone could investigate to be more efficient */
9e31bebe 1357 for (cnt = 0, err = 0; cnt < blk_rq_cur_sectors(rq); cnt++) {
1da177e4
LT		 1358#ifdef DEBUG
1359 printk("fd: sector %ld + %d requested for %s\n",
9e31bebe
TH		 1360 blk_rq_pos(rq), cnt,
1361 (rq_data_dir(rq) == READ) ? "read" : "write");
1da177e4 1362#endif
9e31bebe 1363 block = blk_rq_pos(rq) + cnt;
1da177e4 1364 if ((int)block > floppy->blocks) {
9e31bebe
TH		 1365 err = -EIO;
1366 break;
1da177e4
LT		 1367 }
1368
1369 track = block / (floppy->dtype->sects * floppy->type->sect_mult);
1370 sector = block % (floppy->dtype->sects * floppy->type->sect_mult);
9e31bebe 1371 data = rq->buffer + 512 * cnt;
1da177e4
LT		 1372#ifdef DEBUG
1373 printk("access to track %d, sector %d, with buffer at "
1374 "0x%08lx\n", track, sector, data);
1375#endif
1376
1da177e4 1377 if (get_track(drive, track) == -1) {
9e31bebe
TH		 1378 err = -EIO;
1379 break;
1da177e4
LT		 1380 }
1381
9e31bebe 1382 if (rq_data_dir(rq) == READ) {
1da177e4 1383 memcpy(data, floppy->trackbuf + sector * 512, 512);
9e31bebe 1384 } else {
1da177e4
LT		 1385 memcpy(floppy->trackbuf + sector * 512, data, 512);
1386
1387 /* keep the drive spinning while writes are scheduled */
1388 if (!fd_motor_on(drive)) {
9e31bebe
TH		 1389 err = -EIO;
1390 break;
1da177e4
LT		 1391 }
1392 /*
1393 * setup a callback to write the track buffer
1394 * after a short (1 tick) delay.
1395 */
1396 local_irq_save(flags);
1397
1398 floppy->dirty = 1;
1399 /* reset the timer */
1400 mod_timer (flush_track_timer + drive, jiffies + 1);
1401 local_irq_restore(flags);
1da177e4
LT		 1402 }
1403 }
1da177e4 1404
9e31bebe
TH		 1405 if (__blk_end_request_cur(rq, err))
1406 goto next_segment;
1407 goto next_req;
1da177e4
LT		 1408}
1409
165125e1 1410static void do_fd_request(struct request_queue * q)
1da177e4
LT		 1411{
1412 redo_fd_request();
1413}
1414
a885c8c4
CH		 1415static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1416{
1417 int drive = MINOR(bdev->bd_dev) & 3;
1418
1419 geo->heads = unit[drive].type->heads;
1420 geo->sectors = unit[drive].dtype->sects * unit[drive].type->sect_mult;
1421 geo->cylinders = unit[drive].type->tracks;
1422 return 0;
1423}
1424
47225db5 1425static int fd_ioctl(struct block_device *bdev, fmode_t mode,
1da177e4
LT		 1426 unsigned int cmd, unsigned long param)
1427{
47225db5
AV		 1428 struct amiga_floppy_struct *p = bdev->bd_disk->private_data;
1429 int drive = p - unit;
1da177e4 1430 static struct floppy_struct getprm;
8a423e54 1431 void __user *argp = (void __user *)param;
1da177e4
LT		 1432
1433 switch(cmd){
1da177e4
LT		 1434 case FDFMTBEG:
1435 get_fdc(drive);
1436 if (fd_ref[drive] > 1) {
1437 rel_fdc();
1438 return -EBUSY;
1439 }
47225db5 1440 fsync_bdev(bdev);
1da177e4
LT		 1441 if (fd_motor_on(drive) == 0) {
1442 rel_fdc();
1443 return -ENODEV;
1444 }
1445 if (fd_calibrate(drive) == 0) {
1446 rel_fdc();
1447 return -ENXIO;
1448 }
1449 floppy_off(drive);
1450 rel_fdc();
1451 break;
1452 case FDFMTTRK:
47225db5 1453 if (param < p->type->tracks * p->type->heads)
1da177e4
LT		 1454 {
1455 get_fdc(drive);
1456 if (fd_seek(drive,param) != 0){
47225db5
AV		 1457 memset(p->trackbuf, FD_FILL_BYTE,
1458 p->dtype->sects * p->type->sect_mult * 512);
1da177e4
LT		 1459 non_int_flush_track(drive);
1460 }
1461 floppy_off(drive);
1462 rel_fdc();
1463 }
1464 else
1465 return -EINVAL;
1466 break;
1467 case FDFMTEND:
1468 floppy_off(drive);
47225db5 1469 invalidate_bdev(bdev);
1da177e4
LT		 1470 break;
1471 case FDGETPRM:
1472 memset((void *)&getprm, 0, sizeof (getprm));
47225db5
AV		 1473 getprm.track=p->type->tracks;
1474 getprm.head=p->type->heads;
1475 getprm.sect=p->dtype->sects * p->type->sect_mult;
1476 getprm.size=p->blocks;
8a423e54 1477 if (copy_to_user(argp, &getprm, sizeof(struct floppy_struct)))
1da177e4
LT		 1478 return -EFAULT;
1479 break;
1480 case FDSETPRM:
1481 case FDDEFPRM:
1482 return -EINVAL;
1483 case FDFLUSH: /* unconditionally, even if not needed */
1484 del_timer (flush_track_timer + drive);
1485 non_int_flush_track(drive);
1486 break;
1487#ifdef RAW_IOCTL
1488 case IOCTL_RAW_TRACK:
47225db5 1489 if (copy_to_user(argp, raw_buf, p->type->read_size))
1da177e4
LT		 1490 return -EFAULT;
1491 else
47225db5 1492 return p->type->read_size;
1da177e4
LT		 1493#endif
1494 default:
1495 printk(KERN_DEBUG "fd_ioctl: unknown cmd %d for drive %d.",
1496 cmd, drive);
1497 return -ENOSYS;
1498 }
1499 return 0;
1500}
1501
1502static void fd_probe(int dev)
1503{
1504 unsigned long code;
1505 int type;
1506 int drive;
1507
1508 drive = dev & 3;
1509 code = fd_get_drive_id(drive);
1510
1511 /* get drive type */
1512 for (type = 0; type < num_dr_types; type++)
1513 if (drive_types[type].code == code)
1514 break;
1515
1516 if (type >= num_dr_types) {
1517 printk(KERN_WARNING "fd_probe: unsupported drive type "
1518 "%08lx found\n", code);
1519 unit[drive].type = &drive_types[num_dr_types-1]; /* FD_NODRIVE */
1520 return;
1521 }
1522
1523 unit[drive].type = drive_types + type;
1524 unit[drive].track = -1;
1525
1526 unit[drive].disk = -1;
1527 unit[drive].motor = 0;
1528 unit[drive].busy = 0;
1529 unit[drive].status = -1;
1530}
1531
1532/*
1533 * floppy_open check for aliasing (/dev/fd0 can be the same as
1534 * /dev/PS0 etc), and disallows simultaneous access to the same
1535 * drive with different device numbers.
1536 */
47225db5 1537static int floppy_open(struct block_device *bdev, fmode_t mode)
1da177e4 1538{
47225db5
AV		 1539 int drive = MINOR(bdev->bd_dev) & 3;
1540 int system = (MINOR(bdev->bd_dev) & 4) >> 2;
1da177e4
LT		 1541 int old_dev;
1542 unsigned long flags;
1543
1544 old_dev = fd_device[drive];
1545
1546 if (fd_ref[drive] && old_dev != system)
1547 return -EBUSY;
1548
47225db5
AV		 1549 if (mode & (FMODE_READ|FMODE_WRITE)) {
1550 check_disk_change(bdev);
1551 if (mode & FMODE_WRITE) {
1da177e4
LT		 1552 int wrprot;
1553
1554 get_fdc(drive);
1555 fd_select (drive);
1556 wrprot = !(ciaa.pra & DSKPROT);
1557 fd_deselect (drive);
1558 rel_fdc();
1559
1560 if (wrprot)
1561 return -EROFS;
1562 }
1563 }
1564
1565 local_irq_save(flags);
1566 fd_ref[drive]++;
1567 fd_device[drive] = system;
1568 local_irq_restore(flags);
1569
1570 unit[drive].dtype=&data_types[system];
1571 unit[drive].blocks=unit[drive].type->heads*unit[drive].type->tracks*
1572 data_types[system].sects*unit[drive].type->sect_mult;
1573 set_capacity(unit[drive].gendisk, unit[drive].blocks);
1574
1575 printk(KERN_INFO "fd%d: accessing %s-disk with %s-layout\n",drive,
1576 unit[drive].type->name, data_types[system].name);
1577
1578 return 0;
1579}
1580
47225db5 1581static int floppy_release(struct gendisk *disk, fmode_t mode)
1da177e4 1582{
47225db5
AV		 1583 struct amiga_floppy_struct *p = disk->private_data;
1584 int drive = p - unit;
1da177e4
LT		 1585
1586 if (unit[drive].dirty == 1) {
1587 del_timer (flush_track_timer + drive);
1588 non_int_flush_track (drive);
1589 }
1590
1591 if (!fd_ref[drive]--) {
1592 printk(KERN_CRIT "floppy_release with fd_ref == 0");
1593 fd_ref[drive] = 0;
1594 }
1595#ifdef MODULE
1596/* the mod_use counter is handled this way */
1597 floppy_off (drive | 0x40000000);
1598#endif
1599 return 0;
1600}
1601
1602/*
1603 * floppy-change is never called from an interrupt, so we can relax a bit
1604 * here, sleep etc. Note that floppy-on tries to set current_DOR to point
1605 * to the desired drive, but it will probably not survive the sleep if
1606 * several floppies are used at the same time: thus the loop.
1607 */
1608static int amiga_floppy_change(struct gendisk *disk)
1609{
1610 struct amiga_floppy_struct *p = disk->private_data;
1611 int drive = p - unit;
1612 int changed;
1613 static int first_time = 1;
1614
1615 if (first_time)
1616 changed = first_time--;
1617 else {
1618 get_fdc(drive);
1619 fd_select (drive);
1620 changed = !(ciaa.pra & DSKCHANGE);
1621 fd_deselect (drive);
1622 rel_fdc();
1623 }
1624
1625 if (changed) {
1626 fd_probe(drive);
1627 p->track = -1;
1628 p->dirty = 0;
1629 writepending = 0; /* if this was true before, too bad! */
1630 writefromint = 0;
1631 return 1;
1632 }
1633 return 0;
1634}
1635
83d5cde4 1636static const struct block_device_operations floppy_fops = {
1da177e4 1637 .owner = THIS_MODULE,
47225db5
AV		 1638 .open = floppy_open,
1639 .release = floppy_release,
1640 .locked_ioctl = fd_ioctl,
a885c8c4 1641 .getgeo = fd_getgeo,
1da177e4
LT		 1642 .media_changed = amiga_floppy_change,
1643};
1644
1da177e4
LT		 1645static int __init fd_probe_drives(void)
1646{
1647 int drive,drives,nomem;
1648
ad361c98 1649 printk(KERN_INFO "FD: probing units\nfound ");
1da177e4
LT		 1650 drives=0;
1651 nomem=0;
1652 for(drive=0;drive<FD_MAX_UNITS;drive++) {
1653 struct gendisk *disk;
1654 fd_probe(drive);
1655 if (unit[drive].type->code == FD_NODRIVE)
1656 continue;
1657 disk = alloc_disk(1);
1658 if (!disk) {
1659 unit[drive].type->code = FD_NODRIVE;
1660 continue;
1661 }
1662 unit[drive].gendisk = disk;
1663 drives++;
1664 if ((unit[drive].trackbuf = kmalloc(FLOPPY_MAX_SECTORS * 512, GFP_KERNEL)) == NULL) {
1665 printk("no mem for ");
1666 unit[drive].type = &drive_types[num_dr_types - 1]; /* FD_NODRIVE */
1667 drives--;
1668 nomem = 1;
1669 }
1670 printk("fd%d ",drive);
1671 disk->major = FLOPPY_MAJOR;
1672 disk->first_minor = drive;
1673 disk->fops = &floppy_fops;
1674 sprintf(disk->disk_name, "fd%d", drive);
1675 disk->private_data = &unit[drive];
1676 disk->queue = floppy_queue;
1677 set_capacity(disk, 880*2);
1678 add_disk(disk);
1679 }
1680 if ((drives > 0) || (nomem == 0)) {
1681 if (drives == 0)
1682 printk("no drives");
1683 printk("\n");
1684 return drives;
1685 }
1686 printk("\n");
1687 return -ENOMEM;
1688}
1689
1690static struct kobject *floppy_find(dev_t dev, int *part, void *data)
1691{
1692 int drive = *part & 3;
1693 if (unit[drive].type->code == FD_NODRIVE)
1694 return NULL;
1695 *part = 0;
1696 return get_disk(unit[drive].gendisk);
1697}
1698
2db5f59c 1699static int __init amiga_floppy_init(void)
1da177e4
LT		 1700{
1701 int i, ret;
1702
2db5f59c 1703 if (!MACH_IS_AMIGA)
fd5b462f 1704 return -ENODEV;
2db5f59c 1705
1da177e4 1706 if (!AMIGAHW_PRESENT(AMI_FLOPPY))
fd5b462f 1707 return -ENODEV;
1da177e4
LT		 1708
1709 if (register_blkdev(FLOPPY_MAJOR,"fd"))
1710 return -EBUSY;
1711
1712 /*
1713 * We request DSKPTR, DSKLEN and DSKDATA only, because the other
1714 * floppy registers are too spreaded over the custom register space
1715 */
1716 ret = -EBUSY;
1717 if (!request_mem_region(CUSTOM_PHYSADDR+0x20, 8, "amiflop [Paula]")) {
1718 printk("fd: cannot get floppy registers\n");
1719 goto out_blkdev;
1720 }
1721
1722 ret = -ENOMEM;
1723 if ((raw_buf = (char *)amiga_chip_alloc (RAW_BUF_SIZE, "Floppy")) ==
1724 NULL) {
1725 printk("fd: cannot get chip mem buffer\n");
1726 goto out_memregion;
1727 }
1728
1729 ret = -EBUSY;
1730 if (request_irq(IRQ_AMIGA_DSKBLK, fd_block_done, 0, "floppy_dma", NULL)) {
1731 printk("fd: cannot get irq for dma\n");
1732 goto out_irq;
1733 }
1734
1735 if (request_irq(IRQ_AMIGA_CIAA_TB, ms_isr, 0, "floppy_timer", NULL)) {
1736 printk("fd: cannot get irq for timer\n");
1737 goto out_irq2;
1738 }
1739
1740 ret = -ENOMEM;
1741 floppy_queue = blk_init_queue(do_fd_request, &amiflop_lock);
1742 if (!floppy_queue)
1743 goto out_queue;
1744
fd5b462f 1745 ret = -ENODEV;
1da177e4
LT		 1746 if (fd_probe_drives() < 1) /* No usable drives */
1747 goto out_probe;
1748
1749 blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
1750 floppy_find, NULL, NULL);
1751
1752 /* initialize variables */
1753 init_timer(&motor_on_timer);
1754 motor_on_timer.expires = 0;
1755 motor_on_timer.data = 0;
1756 motor_on_timer.function = motor_on_callback;
1757 for (i = 0; i < FD_MAX_UNITS; i++) {
1758 init_timer(&motor_off_timer[i]);
1759 motor_off_timer[i].expires = 0;
1760 motor_off_timer[i].data = i|0x80000000;
1761 motor_off_timer[i].function = fd_motor_off;
1762 init_timer(&flush_track_timer[i]);
1763 flush_track_timer[i].expires = 0;
1764 flush_track_timer[i].data = i;
1765 flush_track_timer[i].function = flush_track_callback;
1766
1767 unit[i].track = -1;
1768 }
1769
1770 init_timer(&post_write_timer);
1771 post_write_timer.expires = 0;
1772 post_write_timer.data = 0;
1773 post_write_timer.function = post_write;
1774
1775 for (i = 0; i < 128; i++)
1776 mfmdecode[i]=255;
1777 for (i = 0; i < 16; i++)
1778 mfmdecode[mfmencode[i]]=i;
1779
1780 /* make sure that disk DMA is enabled */
1781 custom.dmacon = DMAF_SETCLR | DMAF_DISK;
1782
1783 /* init ms timer */
1784 ciaa.crb = 8; /* one-shot, stop */
1785 return 0;
1786
1787out_probe:
1788 blk_cleanup_queue(floppy_queue);
1789out_queue:
1790 free_irq(IRQ_AMIGA_CIAA_TB, NULL);
1791out_irq2:
1792 free_irq(IRQ_AMIGA_DSKBLK, NULL);
1793out_irq:
1794 amiga_chip_free(raw_buf);
1795out_memregion:
1796 release_mem_region(CUSTOM_PHYSADDR+0x20, 8);
1797out_blkdev:
1798 unregister_blkdev(FLOPPY_MAJOR,"fd");
1799 return ret;
1800}
1801
2db5f59c 1802module_init(amiga_floppy_init);
1da177e4 1803#ifdef MODULE
1da177e4 1804
1da177e4
LT		 1805#if 0 /* not safe to unload */
1806void cleanup_module(void)
1807{
1808 int i;
1809
1810 for( i = 0; i < FD_MAX_UNITS; i++) {
1811 if (unit[i].type->code != FD_NODRIVE) {
1812 del_gendisk(unit[i].gendisk);
1813 put_disk(unit[i].gendisk);
1814 kfree(unit[i].trackbuf);
1815 }
1816 }
1817 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
1818 free_irq(IRQ_AMIGA_CIAA_TB, NULL);
1819 free_irq(IRQ_AMIGA_DSKBLK, NULL);
1820 custom.dmacon = DMAF_DISK; /* disable DMA */
1821 amiga_chip_free(raw_buf);
1822 blk_cleanup_queue(floppy_queue);
1823 release_mem_region(CUSTOM_PHYSADDR+0x20, 8);
1824 unregister_blkdev(FLOPPY_MAJOR, "fd");
1825}
1826#endif
63907435
AV		 1827
1828#else
1829static int __init amiga_floppy_setup (char *str)
1830{
1831 int n;
1832 if (!MACH_IS_AMIGA)
1833 return 0;
1834 if (!get_option(&str, &n))
1835 return 0;
1836 printk (KERN_INFO "amiflop: Setting default df0 to %x\n", n);
1837 fd_def_df0 = n;
9b41046c 1838 return 1;
63907435
AV		 1839}
1840
1841__setup("floppy=", amiga_floppy_setup);
1da177e4 1842#endif
Clone of davem's net-next-2.6 tree