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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/block/amiflop.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/block/amiflop.c')
-rw-r--r--drivers/block/amiflop.c1850
1 files changed, 1850 insertions, 0 deletions
diff --git a/drivers/block/amiflop.c b/drivers/block/amiflop.c
new file mode 100644
index 000000000000..1468e8cf712d
--- /dev/null
+++ b/drivers/block/amiflop.c
@@ -0,0 +1,1850 @@
1/*
2 * linux/amiga/amiflop.c
3 *
4 * Copyright (C) 1993 Greg Harp
5 * Portions of this driver are based on code contributed by Brad Pepers
6 *
7 * revised 28.5.95 by Joerg Dorchain
8 * - now no bugs(?) any more for both HD & DD
9 * - added support for 40 Track 5.25" drives, 80-track hopefully behaves
10 * like 3.5" dd (no way to test - are there any 5.25" drives out there
11 * that work on an A4000?)
12 * - wrote formatting routine (maybe dirty, but works)
13 *
14 * june/july 1995 added ms-dos support by Joerg Dorchain
15 * (portions based on messydos.device and various contributors)
16 * - currently only 9 and 18 sector disks
17 *
18 * - fixed a bug with the internal trackbuffer when using multiple
19 * disks the same time
20 * - made formatting a bit safer
21 * - added command line and machine based default for "silent" df0
22 *
23 * december 1995 adapted for 1.2.13pl4 by Joerg Dorchain
24 * - works but I think it's inefficient. (look in redo_fd_request)
25 * But the changes were very efficient. (only three and a half lines)
26 *
27 * january 1996 added special ioctl for tracking down read/write problems
28 * - usage ioctl(d, RAW_TRACK, ptr); the raw track buffer (MFM-encoded data
29 * is copied to area. (area should be large enough since no checking is
30 * done - 30K is currently sufficient). return the actual size of the
31 * trackbuffer
32 * - replaced udelays() by a timer (CIAA timer B) for the waits
33 * needed for the disk mechanic.
34 *
35 * february 1996 fixed error recovery and multiple disk access
36 * - both got broken the first time I tampered with the driver :-(
37 * - still not safe, but better than before
38 *
39 * revised Marts 3rd, 1996 by Jes Sorensen for use in the 1.3.28 kernel.
40 * - Minor changes to accept the kdev_t.
41 * - Replaced some more udelays with ms_delays. Udelay is just a loop,
42 * and so the delay will be different depending on the given
43 * processor :-(
44 * - The driver could use a major cleanup because of the new
45 * major/minor handling that came with kdev_t. It seems to work for
46 * the time being, but I can't guarantee that it will stay like
47 * that when we start using 16 (24?) bit minors.
48 *
49 * restructured jan 1997 by Joerg Dorchain
50 * - Fixed Bug accessing multiple disks
51 * - some code cleanup
52 * - added trackbuffer for each drive to speed things up
53 * - fixed some race conditions (who finds the next may send it to me ;-)
54 */
55
56#include <linux/module.h>
57
58#include <linux/fd.h>
59#include <linux/hdreg.h>
60#include <linux/delay.h>
61#include <linux/init.h>
62#include <linux/amifdreg.h>
63#include <linux/amifd.h>
64#include <linux/buffer_head.h>
65#include <linux/blkdev.h>
66#include <linux/elevator.h>
67
68#include <asm/setup.h>
69#include <asm/uaccess.h>
70#include <asm/amigahw.h>
71#include <asm/amigaints.h>
72#include <asm/irq.h>
73
74#undef DEBUG /* print _LOTS_ of infos */
75
76#define RAW_IOCTL
77#ifdef RAW_IOCTL
78#define IOCTL_RAW_TRACK 0x5254524B /* 'RTRK' */
79#endif
80
81/*
82 * Defines
83 */
84
85/*
86 * Error codes
87 */
88#define FD_OK 0 /* operation succeeded */
89#define FD_ERROR -1 /* general error (seek, read, write, etc) */
90#define FD_NOUNIT 1 /* unit does not exist */
91#define FD_UNITBUSY 2 /* unit already active */
92#define FD_NOTACTIVE 3 /* unit is not active */
93#define FD_NOTREADY 4 /* unit is not ready (motor not on/no disk) */
94
95#define MFM_NOSYNC 1
96#define MFM_HEADER 2
97#define MFM_DATA 3
98#define MFM_TRACK 4
99
100/*
101 * Floppy ID values
102 */
103#define FD_NODRIVE 0x00000000 /* response when no unit is present */
104#define FD_DD_3 0xffffffff /* double-density 3.5" (880K) drive */
105#define FD_HD_3 0x55555555 /* high-density 3.5" (1760K) drive */
106#define FD_DD_5 0xaaaaaaaa /* double-density 5.25" (440K) drive */
107
108static unsigned long int fd_def_df0 = FD_DD_3; /* default for df0 if it doesn't identify */
109
110module_param(fd_def_df0, ulong, 0);
111MODULE_LICENSE("GPL");
112
113static struct request_queue *floppy_queue;
114#define QUEUE (floppy_queue)
115#define CURRENT elv_next_request(floppy_queue)
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};
134static int num_dr_types = sizeof(drive_types) / sizeof(drive_types[0]);
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
158static DECLARE_WAIT_QUEUE_HEAD(motor_wait);
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 */
186static volatile int ms_busy = -1;
187static DECLARE_WAIT_QUEUE_HEAD(ms_wait);
188#define MS_TICKS ((amiga_eclock+50)/1000)
189
190/*
191 * Note that MAX_ERRORS=X doesn't imply that we retry every bad read
192 * max X times - some types of errors increase the errorcount by 2 or
193 * even 3, so we might actually retry only X/2 times before giving up.
194 */
195#define MAX_ERRORS 12
196
197/* Prevent "aliased" accesses. */
198static int fd_ref[4] = { 0,0,0,0 };
199static int fd_device[4] = { 0, 0, 0, 0 };
200
201/*
202 * Here come the actual hardware access and helper functions.
203 * They are not reentrant and single threaded because all drives
204 * share the same hardware and the same trackbuffer.
205 */
206
207/* Milliseconds timer */
208
209static irqreturn_t ms_isr(int irq, void *dummy, struct pt_regs *fp)
210{
211 ms_busy = -1;
212 wake_up(&ms_wait);
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{
220 unsigned long flags;
221 int ticks;
222 if (ms > 0) {
223 local_irq_save(flags);
224 while (ms_busy == 0)
225 sleep_on(&ms_wait);
226 ms_busy = 0;
227 local_irq_restore(flags);
228 ticks = MS_TICKS*ms-1;
229 ciaa.tblo=ticks%256;
230 ciaa.tbhi=ticks/256;
231 ciaa.crb=0x19; /*count eclock, force load, one-shoot, start */
232 sleep_on(&ms_wait);
233 }
234}
235
236/* Hardware semaphore */
237
238/* returns true when we would get the semaphore */
239static inline int try_fdc(int drive)
240{
241 drive &= 3;
242 return ((fdc_busy < 0) || (fdc_busy == drive));
243}
244
245static void get_fdc(int drive)
246{
247 unsigned long flags;
248
249 drive &= 3;
250#ifdef DEBUG
251 printk("get_fdc: drive %d fdc_busy %d fdc_nested %d\n",drive,fdc_busy,fdc_nested);
252#endif
253 local_irq_save(flags);
254 while (!try_fdc(drive))
255 sleep_on(&fdc_wait);
256 fdc_busy = drive;
257 fdc_nested++;
258 local_irq_restore(flags);
259}
260
261static inline void rel_fdc(void)
262{
263#ifdef DEBUG
264 if (fdc_nested == 0)
265 printk("fd: unmatched rel_fdc\n");
266 printk("rel_fdc: fdc_busy %d fdc_nested %d\n",fdc_busy,fdc_nested);
267#endif
268 fdc_nested--;
269 if (fdc_nested == 0) {
270 fdc_busy = -1;
271 wake_up(&fdc_wait);
272 }
273}
274
275static void fd_select (int drive)
276{
277 unsigned char prb = ~0;
278
279 drive&=3;
280#ifdef DEBUG
281 printk("selecting %d\n",drive);
282#endif
283 if (drive == selected)
284 return;
285 get_fdc(drive);
286 selected = drive;
287
288 if (unit[drive].track % 2 != 0)
289 prb &= ~DSKSIDE;
290 if (unit[drive].motor == 1)
291 prb &= ~DSKMOTOR;
292 ciab.prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
293 ciab.prb = prb;
294 prb &= ~SELMASK(drive);
295 ciab.prb = prb;
296 rel_fdc();
297}
298
299static void fd_deselect (int drive)
300{
301 unsigned char prb;
302 unsigned long flags;
303
304 drive&=3;
305#ifdef DEBUG
306 printk("deselecting %d\n",drive);
307#endif
308 if (drive != selected) {
309 printk(KERN_WARNING "Deselecting drive %d while %d was selected!\n",drive,selected);
310 return;
311 }
312
313 get_fdc(drive);
314 local_irq_save(flags);
315
316 selected = -1;
317
318 prb = ciab.prb;
319 prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
320 ciab.prb = prb;
321
322 local_irq_restore (flags);
323 rel_fdc();
324
325}
326
327static void motor_on_callback(unsigned long nr)
328{
329 if (!(ciaa.pra & DSKRDY) || --on_attempts == 0) {
330 wake_up (&motor_wait);
331 } else {
332 motor_on_timer.expires = jiffies + HZ/10;
333 add_timer(&motor_on_timer);
334 }
335}
336
337static int fd_motor_on(int nr)
338{
339 nr &= 3;
340
341 del_timer(motor_off_timer + nr);
342
343 if (!unit[nr].motor) {
344 unit[nr].motor = 1;
345 fd_select(nr);
346
347 motor_on_timer.data = nr;
348 mod_timer(&motor_on_timer, jiffies + HZ/2);
349
350 on_attempts = 10;
351 sleep_on (&motor_wait);
352 fd_deselect(nr);
353 }
354
355 if (on_attempts == 0) {
356 on_attempts = -1;
357#if 0
358 printk (KERN_ERR "motor_on failed, turning motor off\n");
359 fd_motor_off (nr);
360 return 0;
361#else
362 printk (KERN_WARNING "DSKRDY not set after 1.5 seconds - assuming drive is spinning notwithstanding\n");
363#endif
364 }
365
366 return 1;
367}
368
369static void fd_motor_off(unsigned long drive)
370{
371 long calledfromint;
372#ifdef MODULE
373 long decusecount;
374
375 decusecount = drive & 0x40000000;
376#endif
377 calledfromint = drive & 0x80000000;
378 drive&=3;
379 if (calledfromint && !try_fdc(drive)) {
380 /* We would be blocked in an interrupt, so try again later */
381 motor_off_timer[drive].expires = jiffies + 1;
382 add_timer(motor_off_timer + drive);
383 return;
384 }
385 unit[drive].motor = 0;
386 fd_select(drive);
387 udelay (1);
388 fd_deselect(drive);
389}
390
391static void floppy_off (unsigned int nr)
392{
393 int drive;
394
395 drive = nr & 3;
396 /* called this way it is always from interrupt */
397 motor_off_timer[drive].data = nr | 0x80000000;
398 mod_timer(motor_off_timer + drive, jiffies + 3*HZ);
399}
400
401static int fd_calibrate(int drive)
402{
403 unsigned char prb;
404 int n;
405
406 drive &= 3;
407 get_fdc(drive);
408 if (!fd_motor_on (drive))
409 return 0;
410 fd_select (drive);
411 prb = ciab.prb;
412 prb |= DSKSIDE;
413 prb &= ~DSKDIREC;
414 ciab.prb = prb;
415 for (n = unit[drive].type->tracks/2; n != 0; --n) {
416 if (ciaa.pra & DSKTRACK0)
417 break;
418 prb &= ~DSKSTEP;
419 ciab.prb = prb;
420 prb |= DSKSTEP;
421 udelay (2);
422 ciab.prb = prb;
423 ms_delay(unit[drive].type->step_delay);
424 }
425 ms_delay (unit[drive].type->settle_time);
426 prb |= DSKDIREC;
427 n = unit[drive].type->tracks + 20;
428 for (;;) {
429 prb &= ~DSKSTEP;
430 ciab.prb = prb;
431 prb |= DSKSTEP;
432 udelay (2);
433 ciab.prb = prb;
434 ms_delay(unit[drive].type->step_delay + 1);
435 if ((ciaa.pra & DSKTRACK0) == 0)
436 break;
437 if (--n == 0) {
438 printk (KERN_ERR "fd%d: calibrate failed, turning motor off\n", drive);
439 fd_motor_off (drive);
440 unit[drive].track = -1;
441 rel_fdc();
442 return 0;
443 }
444 }
445 unit[drive].track = 0;
446 ms_delay(unit[drive].type->settle_time);
447
448 rel_fdc();
449 fd_deselect(drive);
450 return 1;
451}
452
453static int fd_seek(int drive, int track)
454{
455 unsigned char prb;
456 int cnt;
457
458#ifdef DEBUG
459 printk("seeking drive %d to track %d\n",drive,track);
460#endif
461 drive &= 3;
462 get_fdc(drive);
463 if (unit[drive].track == track) {
464 rel_fdc();
465 return 1;
466 }
467 if (!fd_motor_on(drive)) {
468 rel_fdc();
469 return 0;
470 }
471 if (unit[drive].track < 0 && !fd_calibrate(drive)) {
472 rel_fdc();
473 return 0;
474 }
475
476 fd_select (drive);
477 cnt = unit[drive].track/2 - track/2;
478 prb = ciab.prb;
479 prb |= DSKSIDE | DSKDIREC;
480 if (track % 2 != 0)
481 prb &= ~DSKSIDE;
482 if (cnt < 0) {
483 cnt = - cnt;
484 prb &= ~DSKDIREC;
485 }
486 ciab.prb = prb;
487 if (track % 2 != unit[drive].track % 2)
488 ms_delay (unit[drive].type->side_time);
489 unit[drive].track = track;
490 if (cnt == 0) {
491 rel_fdc();
492 fd_deselect(drive);
493 return 1;
494 }
495 do {
496 prb &= ~DSKSTEP;
497 ciab.prb = prb;
498 prb |= DSKSTEP;
499 udelay (1);
500 ciab.prb = prb;
501 ms_delay (unit[drive].type->step_delay);
502 } while (--cnt != 0);
503 ms_delay (unit[drive].type->settle_time);
504
505 rel_fdc();
506 fd_deselect(drive);
507 return 1;
508}
509
510static unsigned long fd_get_drive_id(int drive)
511{
512 int i;
513 ulong id = 0;
514
515 drive&=3;
516 get_fdc(drive);
517 /* set up for ID */
518 MOTOR_ON;
519 udelay(2);
520 SELECT(SELMASK(drive));
521 udelay(2);
522 DESELECT(SELMASK(drive));
523 udelay(2);
524 MOTOR_OFF;
525 udelay(2);
526 SELECT(SELMASK(drive));
527 udelay(2);
528 DESELECT(SELMASK(drive));
529 udelay(2);
530
531 /* loop and read disk ID */
532 for (i=0; i<32; i++) {
533 SELECT(SELMASK(drive));
534 udelay(2);
535
536 /* read and store value of DSKRDY */
537 id <<= 1;
538 id |= (ciaa.pra & DSKRDY) ? 0 : 1; /* cia regs are low-active! */
539
540 DESELECT(SELMASK(drive));
541 }
542
543 rel_fdc();
544
545 /*
546 * RB: At least A500/A2000's df0: don't identify themselves.
547 * As every (real) Amiga has at least a 3.5" DD drive as df0:
548 * we default to that if df0: doesn't identify as a certain
549 * type.
550 */
551 if(drive == 0 && id == FD_NODRIVE)
552 {
553 id = fd_def_df0;
554 printk(KERN_NOTICE "fd: drive 0 didn't identify, setting default %08lx\n", (ulong)fd_def_df0);
555 }
556 /* return the ID value */
557 return (id);
558}
559
560static irqreturn_t fd_block_done(int irq, void *dummy, struct pt_regs *fp)
561{
562 if (block_flag)
563 custom.dsklen = 0x4000;
564
565 if (block_flag == 2) { /* writing */
566 writepending = 2;
567 post_write_timer.expires = jiffies + 1; /* at least 2 ms */
568 post_write_timer.data = selected;
569 add_timer(&post_write_timer);
570 }
571 else { /* reading */
572 block_flag = 0;
573 wake_up (&wait_fd_block);
574 }
575 return IRQ_HANDLED;
576}
577
578static void raw_read(int drive)
579{
580 drive&=3;
581 get_fdc(drive);
582 while (block_flag)
583 sleep_on(&wait_fd_block);
584 fd_select(drive);
585 /* setup adkcon bits correctly */
586 custom.adkcon = ADK_MSBSYNC;
587 custom.adkcon = ADK_SETCLR|ADK_WORDSYNC|ADK_FAST;
588
589 custom.dsksync = MFM_SYNC;
590
591 custom.dsklen = 0;
592 custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf);
593 custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN;
594 custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN;
595
596 block_flag = 1;
597
598 while (block_flag)
599 sleep_on (&wait_fd_block);
600
601 custom.dsklen = 0;
602 fd_deselect(drive);
603 rel_fdc();
604}
605
606static int raw_write(int drive)
607{
608 ushort adk;
609
610 drive&=3;
611 get_fdc(drive); /* corresponds to rel_fdc() in post_write() */
612 if ((ciaa.pra & DSKPROT) == 0) {
613 rel_fdc();
614 return 0;
615 }
616 while (block_flag)
617 sleep_on(&wait_fd_block);
618 fd_select(drive);
619 /* clear adkcon bits */
620 custom.adkcon = ADK_PRECOMP1|ADK_PRECOMP0|ADK_WORDSYNC|ADK_MSBSYNC;
621 /* set appropriate adkcon bits */
622 adk = ADK_SETCLR|ADK_FAST;
623 if ((ulong)unit[drive].track >= unit[drive].type->precomp2)
624 adk |= ADK_PRECOMP1;
625 else if ((ulong)unit[drive].track >= unit[drive].type->precomp1)
626 adk |= ADK_PRECOMP0;
627 custom.adkcon = adk;
628
629 custom.dsklen = DSKLEN_WRITE;
630 custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf);
631 custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE;
632 custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE;
633
634 block_flag = 2;
635 return 1;
636}
637
638/*
639 * to be called at least 2ms after the write has finished but before any
640 * other access to the hardware.
641 */
642static void post_write (unsigned long drive)
643{
644#ifdef DEBUG
645 printk("post_write for drive %ld\n",drive);
646#endif
647 drive &= 3;
648 custom.dsklen = 0;
649 block_flag = 0;
650 writepending = 0;
651 writefromint = 0;
652 unit[drive].dirty = 0;
653 wake_up(&wait_fd_block);
654 fd_deselect(drive);
655 rel_fdc(); /* corresponds to get_fdc() in raw_write */
656}
657
658
659/*
660 * The following functions are to convert the block contents into raw data
661 * written to disk and vice versa.
662 * (Add other formats here ;-))
663 */
664
665static unsigned long scan_sync(unsigned long raw, unsigned long end)
666{
667 ushort *ptr = (ushort *)raw, *endp = (ushort *)end;
668
669 while (ptr < endp && *ptr++ != 0x4489)
670 ;
671 if (ptr < endp) {
672 while (*ptr == 0x4489 && ptr < endp)
673 ptr++;
674 return (ulong)ptr;
675 }
676 return 0;
677}
678
679static inline unsigned long checksum(unsigned long *addr, int len)
680{
681 unsigned long csum = 0;
682
683 len /= sizeof(*addr);
684 while (len-- > 0)
685 csum ^= *addr++;
686 csum = ((csum>>1) & 0x55555555) ^ (csum & 0x55555555);
687
688 return csum;
689}
690
691static unsigned long decode (unsigned long *data, unsigned long *raw,
692 int len)
693{
694 ulong *odd, *even;
695
696 /* convert length from bytes to longwords */
697 len >>= 2;
698 odd = raw;
699 even = odd + len;
700
701 /* prepare return pointer */
702 raw += len * 2;
703
704 do {
705 *data++ = ((*odd++ & 0x55555555) << 1) | (*even++ & 0x55555555);
706 } while (--len != 0);
707
708 return (ulong)raw;
709}
710
711struct header {
712 unsigned char magic;
713 unsigned char track;
714 unsigned char sect;
715 unsigned char ord;
716 unsigned char labels[16];
717 unsigned long hdrchk;
718 unsigned long datachk;
719};
720
721static int amiga_read(int drive)
722{
723 unsigned long raw;
724 unsigned long end;
725 int scnt;
726 unsigned long csum;
727 struct header hdr;
728
729 drive&=3;
730 raw = (long) raw_buf;
731 end = raw + unit[drive].type->read_size;
732
733 for (scnt = 0;scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) {
734 if (!(raw = scan_sync(raw, end))) {
735 printk (KERN_INFO "can't find sync for sector %d\n", scnt);
736 return MFM_NOSYNC;
737 }
738
739 raw = decode ((ulong *)&hdr.magic, (ulong *)raw, 4);
740 raw = decode ((ulong *)&hdr.labels, (ulong *)raw, 16);
741 raw = decode ((ulong *)&hdr.hdrchk, (ulong *)raw, 4);
742 raw = decode ((ulong *)&hdr.datachk, (ulong *)raw, 4);
743 csum = checksum((ulong *)&hdr,
744 (char *)&hdr.hdrchk-(char *)&hdr);
745
746#ifdef DEBUG
747 printk ("(%x,%d,%d,%d) (%lx,%lx,%lx,%lx) %lx %lx\n",
748 hdr.magic, hdr.track, hdr.sect, hdr.ord,
749 *(ulong *)&hdr.labels[0], *(ulong *)&hdr.labels[4],
750 *(ulong *)&hdr.labels[8], *(ulong *)&hdr.labels[12],
751 hdr.hdrchk, hdr.datachk);
752#endif
753
754 if (hdr.hdrchk != csum) {
755 printk(KERN_INFO "MFM_HEADER: %08lx,%08lx\n", hdr.hdrchk, csum);
756 return MFM_HEADER;
757 }
758
759 /* verify track */
760 if (hdr.track != unit[drive].track) {
761 printk(KERN_INFO "MFM_TRACK: %d, %d\n", hdr.track, unit[drive].track);
762 return MFM_TRACK;
763 }
764
765 raw = decode ((ulong *)(unit[drive].trackbuf + hdr.sect*512),
766 (ulong *)raw, 512);
767 csum = checksum((ulong *)(unit[drive].trackbuf + hdr.sect*512), 512);
768
769 if (hdr.datachk != csum) {
770 printk(KERN_INFO "MFM_DATA: (%x:%d:%d:%d) sc=%d %lx, %lx\n",
771 hdr.magic, hdr.track, hdr.sect, hdr.ord, scnt,
772 hdr.datachk, csum);
773 printk (KERN_INFO "data=(%lx,%lx,%lx,%lx)\n",
774 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[0],
775 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[1],
776 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[2],
777 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[3]);
778 return MFM_DATA;
779 }
780 }
781
782 return 0;
783}
784
785static void encode(unsigned long data, unsigned long *dest)
786{
787 unsigned long data2;
788
789 data &= 0x55555555;
790 data2 = data ^ 0x55555555;
791 data |= ((data2 >> 1) | 0x80000000) & (data2 << 1);
792
793 if (*(dest - 1) & 0x00000001)
794 data &= 0x7FFFFFFF;
795
796 *dest = data;
797}
798
799static void encode_block(unsigned long *dest, unsigned long *src, int len)
800{
801 int cnt, to_cnt = 0;
802 unsigned long data;
803
804 /* odd bits */
805 for (cnt = 0; cnt < len / 4; cnt++) {
806 data = src[cnt] >> 1;
807 encode(data, dest + to_cnt++);
808 }
809
810 /* even bits */
811 for (cnt = 0; cnt < len / 4; cnt++) {
812 data = src[cnt];
813 encode(data, dest + to_cnt++);
814 }
815}
816
817static unsigned long *putsec(int disk, unsigned long *raw, int cnt)
818{
819 struct header hdr;
820 int i;
821
822 disk&=3;
823 *raw = (raw[-1]&1) ? 0x2AAAAAAA : 0xAAAAAAAA;
824 raw++;
825 *raw++ = 0x44894489;
826
827 hdr.magic = 0xFF;
828 hdr.track = unit[disk].track;
829 hdr.sect = cnt;
830 hdr.ord = unit[disk].dtype->sects * unit[disk].type->sect_mult - cnt;
831 for (i = 0; i < 16; i++)
832 hdr.labels[i] = 0;
833 hdr.hdrchk = checksum((ulong *)&hdr,
834 (char *)&hdr.hdrchk-(char *)&hdr);
835 hdr.datachk = checksum((ulong *)(unit[disk].trackbuf+cnt*512), 512);
836
837 encode_block(raw, (ulong *)&hdr.magic, 4);
838 raw += 2;
839 encode_block(raw, (ulong *)&hdr.labels, 16);
840 raw += 8;
841 encode_block(raw, (ulong *)&hdr.hdrchk, 4);
842 raw += 2;
843 encode_block(raw, (ulong *)&hdr.datachk, 4);
844 raw += 2;
845 encode_block(raw, (ulong *)(unit[disk].trackbuf+cnt*512), 512);
846 raw += 256;
847
848 return raw;
849}
850
851static void amiga_write(int disk)
852{
853 unsigned int cnt;
854 unsigned long *ptr = (unsigned long *)raw_buf;
855
856 disk&=3;
857 /* gap space */
858 for (cnt = 0; cnt < 415 * unit[disk].type->sect_mult; cnt++)
859 *ptr++ = 0xaaaaaaaa;
860
861 /* sectors */
862 for (cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++)
863 ptr = putsec (disk, ptr, cnt);
864 *(ushort *)ptr = (ptr[-1]&1) ? 0x2AA8 : 0xAAA8;
865}
866
867
868struct dos_header {
869 unsigned char track, /* 0-80 */
870 side, /* 0-1 */
871 sec, /* 0-...*/
872 len_desc;/* 2 */
873 unsigned short crc; /* on 68000 we got an alignment problem,
874 but this compiler solves it by adding silently
875 adding a pad byte so data won't fit
876 and this took about 3h to discover.... */
877 unsigned char gap1[22]; /* for longword-alignedness (0x4e) */
878};
879
880/* crc routines are borrowed from the messydos-handler */
881
882/* excerpt from the messydos-device
883; The CRC is computed not only over the actual data, but including
884; the SYNC mark (3 * $a1) and the 'ID/DATA - Address Mark' ($fe/$fb).
885; As we don't read or encode these fields into our buffers, we have to
886; preload the registers containing the CRC with the values they would have
887; after stepping over these fields.
888;
889; How CRCs "really" work:
890;
891; First, you should regard a bitstring as a series of coefficients of
892; polynomials. We calculate with these polynomials in modulo-2
893; arithmetic, in which both add and subtract are done the same as
894; exclusive-or. Now, we modify our data (a very long polynomial) in
895; such a way that it becomes divisible by the CCITT-standard 16-bit
896; 16 12 5
897; polynomial: x + x + x + 1, represented by $11021. The easiest
898; way to do this would be to multiply (using proper arithmetic) our
899; datablock with $11021. So we have:
900; data * $11021 =
901; data * ($10000 + $1021) =
902; data * $10000 + data * $1021
903; The left part of this is simple: Just add two 0 bytes. But then
904; the right part (data $1021) remains difficult and even could have
905; a carry into the left part. The solution is to use a modified
906; multiplication, which has a result that is not correct, but with
907; a difference of any multiple of $11021. We then only need to keep
908; the 16 least significant bits of the result.
909;
910; The following algorithm does this for us:
911;
912; unsigned char *data, c, crclo, crchi;
913; while (not done) {
914; c = *data++ + crchi;
915; crchi = (@ c) >> 8 + crclo;
916; crclo = @ c;
917; }
918;
919; Remember, + is done with EOR, the @ operator is in two tables (high
920; and low byte separately), which is calculated as
921;
922; $1021 * (c & $F0)
923; xor $1021 * (c & $0F)
924; xor $1021 * (c >> 4) (* is regular multiplication)
925;
926;
927; Anyway, the end result is the same as the remainder of the division of
928; the data by $11021. I am afraid I need to study theory a bit more...
929
930
931my only works was to code this from manx to C....
932
933*/
934
935static ushort dos_crc(void * data_a3, int data_d0, int data_d1, int data_d3)
936{
937 static unsigned char CRCTable1[] = {
938 0x00,0x10,0x20,0x30,0x40,0x50,0x60,0x70,0x81,0x91,0xa1,0xb1,0xc1,0xd1,0xe1,0xf1,
939 0x12,0x02,0x32,0x22,0x52,0x42,0x72,0x62,0x93,0x83,0xb3,0xa3,0xd3,0xc3,0xf3,0xe3,
940 0x24,0x34,0x04,0x14,0x64,0x74,0x44,0x54,0xa5,0xb5,0x85,0x95,0xe5,0xf5,0xc5,0xd5,
941 0x36,0x26,0x16,0x06,0x76,0x66,0x56,0x46,0xb7,0xa7,0x97,0x87,0xf7,0xe7,0xd7,0xc7,
942 0x48,0x58,0x68,0x78,0x08,0x18,0x28,0x38,0xc9,0xd9,0xe9,0xf9,0x89,0x99,0xa9,0xb9,
943 0x5a,0x4a,0x7a,0x6a,0x1a,0x0a,0x3a,0x2a,0xdb,0xcb,0xfb,0xeb,0x9b,0x8b,0xbb,0xab,
944 0x6c,0x7c,0x4c,0x5c,0x2c,0x3c,0x0c,0x1c,0xed,0xfd,0xcd,0xdd,0xad,0xbd,0x8d,0x9d,
945 0x7e,0x6e,0x5e,0x4e,0x3e,0x2e,0x1e,0x0e,0xff,0xef,0xdf,0xcf,0xbf,0xaf,0x9f,0x8f,
946 0x91,0x81,0xb1,0xa1,0xd1,0xc1,0xf1,0xe1,0x10,0x00,0x30,0x20,0x50,0x40,0x70,0x60,
947 0x83,0x93,0xa3,0xb3,0xc3,0xd3,0xe3,0xf3,0x02,0x12,0x22,0x32,0x42,0x52,0x62,0x72,
948 0xb5,0xa5,0x95,0x85,0xf5,0xe5,0xd5,0xc5,0x34,0x24,0x14,0x04,0x74,0x64,0x54,0x44,
949 0xa7,0xb7,0x87,0x97,0xe7,0xf7,0xc7,0xd7,0x26,0x36,0x06,0x16,0x66,0x76,0x46,0x56,
950 0xd9,0xc9,0xf9,0xe9,0x99,0x89,0xb9,0xa9,0x58,0x48,0x78,0x68,0x18,0x08,0x38,0x28,
951 0xcb,0xdb,0xeb,0xfb,0x8b,0x9b,0xab,0xbb,0x4a,0x5a,0x6a,0x7a,0x0a,0x1a,0x2a,0x3a,
952 0xfd,0xed,0xdd,0xcd,0xbd,0xad,0x9d,0x8d,0x7c,0x6c,0x5c,0x4c,0x3c,0x2c,0x1c,0x0c,
953 0xef,0xff,0xcf,0xdf,0xaf,0xbf,0x8f,0x9f,0x6e,0x7e,0x4e,0x5e,0x2e,0x3e,0x0e,0x1e
954 };
955
956 static unsigned char CRCTable2[] = {
957 0x00,0x21,0x42,0x63,0x84,0xa5,0xc6,0xe7,0x08,0x29,0x4a,0x6b,0x8c,0xad,0xce,0xef,
958 0x31,0x10,0x73,0x52,0xb5,0x94,0xf7,0xd6,0x39,0x18,0x7b,0x5a,0xbd,0x9c,0xff,0xde,
959 0x62,0x43,0x20,0x01,0xe6,0xc7,0xa4,0x85,0x6a,0x4b,0x28,0x09,0xee,0xcf,0xac,0x8d,
960 0x53,0x72,0x11,0x30,0xd7,0xf6,0x95,0xb4,0x5b,0x7a,0x19,0x38,0xdf,0xfe,0x9d,0xbc,
961 0xc4,0xe5,0x86,0xa7,0x40,0x61,0x02,0x23,0xcc,0xed,0x8e,0xaf,0x48,0x69,0x0a,0x2b,
962 0xf5,0xd4,0xb7,0x96,0x71,0x50,0x33,0x12,0xfd,0xdc,0xbf,0x9e,0x79,0x58,0x3b,0x1a,
963 0xa6,0x87,0xe4,0xc5,0x22,0x03,0x60,0x41,0xae,0x8f,0xec,0xcd,0x2a,0x0b,0x68,0x49,
964 0x97,0xb6,0xd5,0xf4,0x13,0x32,0x51,0x70,0x9f,0xbe,0xdd,0xfc,0x1b,0x3a,0x59,0x78,
965 0x88,0xa9,0xca,0xeb,0x0c,0x2d,0x4e,0x6f,0x80,0xa1,0xc2,0xe3,0x04,0x25,0x46,0x67,
966 0xb9,0x98,0xfb,0xda,0x3d,0x1c,0x7f,0x5e,0xb1,0x90,0xf3,0xd2,0x35,0x14,0x77,0x56,
967 0xea,0xcb,0xa8,0x89,0x6e,0x4f,0x2c,0x0d,0xe2,0xc3,0xa0,0x81,0x66,0x47,0x24,0x05,
968 0xdb,0xfa,0x99,0xb8,0x5f,0x7e,0x1d,0x3c,0xd3,0xf2,0x91,0xb0,0x57,0x76,0x15,0x34,
969 0x4c,0x6d,0x0e,0x2f,0xc8,0xe9,0x8a,0xab,0x44,0x65,0x06,0x27,0xc0,0xe1,0x82,0xa3,
970 0x7d,0x5c,0x3f,0x1e,0xf9,0xd8,0xbb,0x9a,0x75,0x54,0x37,0x16,0xf1,0xd0,0xb3,0x92,
971 0x2e,0x0f,0x6c,0x4d,0xaa,0x8b,0xe8,0xc9,0x26,0x07,0x64,0x45,0xa2,0x83,0xe0,0xc1,
972 0x1f,0x3e,0x5d,0x7c,0x9b,0xba,0xd9,0xf8,0x17,0x36,0x55,0x74,0x93,0xb2,0xd1,0xf0
973 };
974
975/* look at the asm-code - what looks in C a bit strange is almost as good as handmade */
976 register int i;
977 register unsigned char *CRCT1, *CRCT2, *data, c, crch, crcl;
978
979 CRCT1=CRCTable1;
980 CRCT2=CRCTable2;
981 data=data_a3;
982 crcl=data_d1;
983 crch=data_d0;
984 for (i=data_d3; i>=0; i--) {
985 c = (*data++) ^ crch;
986 crch = CRCT1[c] ^ crcl;
987 crcl = CRCT2[c];
988 }
989 return (crch<<8)|crcl;
990}
991
992static inline ushort dos_hdr_crc (struct dos_header *hdr)
993{
994 return dos_crc(&(hdr->track), 0xb2, 0x30, 3); /* precomputed magic */
995}
996
997static inline ushort dos_data_crc(unsigned char *data)
998{
999 return dos_crc(data, 0xe2, 0x95 ,511); /* precomputed magic */
1000}
1001
1002static inline unsigned char dos_decode_byte(ushort word)
1003{
1004 register ushort w2;
1005 register unsigned char byte;
1006 register unsigned char *dec = mfmdecode;
1007
1008 w2=word;
1009 w2>>=8;
1010 w2&=127;
1011 byte = dec[w2];
1012 byte <<= 4;
1013 w2 = word & 127;
1014 byte |= dec[w2];
1015 return byte;
1016}
1017
1018static unsigned long dos_decode(unsigned char *data, unsigned short *raw, int len)
1019{
1020 int i;
1021
1022 for (i = 0; i < len; i++)
1023 *data++=dos_decode_byte(*raw++);
1024 return ((ulong)raw);
1025}
1026
1027#ifdef DEBUG
1028static void dbg(unsigned long ptr)
1029{
1030 printk("raw data @%08lx: %08lx, %08lx ,%08lx, %08lx\n", ptr,
1031 ((ulong *)ptr)[0], ((ulong *)ptr)[1],
1032 ((ulong *)ptr)[2], ((ulong *)ptr)[3]);
1033}
1034#endif
1035
1036static int dos_read(int drive)
1037{
1038 unsigned long end;
1039 unsigned long raw;
1040 int scnt;
1041 unsigned short crc,data_crc[2];
1042 struct dos_header hdr;
1043
1044 drive&=3;
1045 raw = (long) raw_buf;
1046 end = raw + unit[drive].type->read_size;
1047
1048 for (scnt=0; scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) {
1049 do { /* search for the right sync of each sec-hdr */
1050 if (!(raw = scan_sync (raw, end))) {
1051 printk(KERN_INFO "dos_read: no hdr sync on "
1052 "track %d, unit %d for sector %d\n",
1053 unit[drive].track,drive,scnt);
1054 return MFM_NOSYNC;
1055 }
1056#ifdef DEBUG
1057 dbg(raw);
1058#endif
1059 } while (*((ushort *)raw)!=0x5554); /* loop usually only once done */
1060 raw+=2; /* skip over headermark */
1061 raw = dos_decode((unsigned char *)&hdr,(ushort *) raw,8);
1062 crc = dos_hdr_crc(&hdr);
1063
1064#ifdef DEBUG
1065 printk("(%3d,%d,%2d,%d) %x\n", hdr.track, hdr.side,
1066 hdr.sec, hdr.len_desc, hdr.crc);
1067#endif
1068
1069 if (crc != hdr.crc) {
1070 printk(KERN_INFO "dos_read: MFM_HEADER %04x,%04x\n",
1071 hdr.crc, crc);
1072 return MFM_HEADER;
1073 }
1074 if (hdr.track != unit[drive].track/unit[drive].type->heads) {
1075 printk(KERN_INFO "dos_read: MFM_TRACK %d, %d\n",
1076 hdr.track,
1077 unit[drive].track/unit[drive].type->heads);
1078 return MFM_TRACK;
1079 }
1080
1081 if (hdr.side != unit[drive].track%unit[drive].type->heads) {
1082 printk(KERN_INFO "dos_read: MFM_SIDE %d, %d\n",
1083 hdr.side,
1084 unit[drive].track%unit[drive].type->heads);
1085 return MFM_TRACK;
1086 }
1087
1088 if (hdr.len_desc != 2) {
1089 printk(KERN_INFO "dos_read: unknown sector len "
1090 "descriptor %d\n", hdr.len_desc);
1091 return MFM_DATA;
1092 }
1093#ifdef DEBUG
1094 printk("hdr accepted\n");
1095#endif
1096 if (!(raw = scan_sync (raw, end))) {
1097 printk(KERN_INFO "dos_read: no data sync on track "
1098 "%d, unit %d for sector%d, disk sector %d\n",
1099 unit[drive].track, drive, scnt, hdr.sec);
1100 return MFM_NOSYNC;
1101 }
1102#ifdef DEBUG
1103 dbg(raw);
1104#endif
1105
1106 if (*((ushort *)raw)!=0x5545) {
1107 printk(KERN_INFO "dos_read: no data mark after "
1108 "sync (%d,%d,%d,%d) sc=%d\n",
1109 hdr.track,hdr.side,hdr.sec,hdr.len_desc,scnt);
1110 return MFM_NOSYNC;
1111 }
1112
1113 raw+=2; /* skip data mark (included in checksum) */
1114 raw = dos_decode((unsigned char *)(unit[drive].trackbuf + (hdr.sec - 1) * 512), (ushort *) raw, 512);
1115 raw = dos_decode((unsigned char *)data_crc,(ushort *) raw,4);
1116 crc = dos_data_crc(unit[drive].trackbuf + (hdr.sec - 1) * 512);
1117
1118 if (crc != data_crc[0]) {
1119 printk(KERN_INFO "dos_read: MFM_DATA (%d,%d,%d,%d) "
1120 "sc=%d, %x %x\n", hdr.track, hdr.side,
1121 hdr.sec, hdr.len_desc, scnt,data_crc[0], crc);
1122 printk(KERN_INFO "data=(%lx,%lx,%lx,%lx,...)\n",
1123 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[0],
1124 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[1],
1125 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[2],
1126 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[3]);
1127 return MFM_DATA;
1128 }
1129 }
1130 return 0;
1131}
1132
1133static inline ushort dos_encode_byte(unsigned char byte)
1134{
1135 register unsigned char *enc, b2, b1;
1136 register ushort word;
1137
1138 enc=mfmencode;
1139 b1=byte;
1140 b2=b1>>4;
1141 b1&=15;
1142 word=enc[b2] <<8 | enc [b1];
1143 return (word|((word&(256|64)) ? 0: 128));
1144}
1145
1146static void dos_encode_block(ushort *dest, unsigned char *src, int len)
1147{
1148 int i;
1149
1150 for (i = 0; i < len; i++) {
1151 *dest=dos_encode_byte(*src++);
1152 *dest|=((dest[-1]&1)||(*dest&0x4000))? 0: 0x8000;
1153 dest++;
1154 }
1155}
1156
1157static unsigned long *ms_putsec(int drive, unsigned long *raw, int cnt)
1158{
1159 static struct dos_header hdr={0,0,0,2,0,
1160 {78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78}};
1161 int i;
1162 static ushort crc[2]={0,0x4e4e};
1163
1164 drive&=3;
1165/* id gap 1 */
1166/* the MFM word before is always 9254 */
1167 for(i=0;i<6;i++)
1168 *raw++=0xaaaaaaaa;
1169/* 3 sync + 1 headermark */
1170 *raw++=0x44894489;
1171 *raw++=0x44895554;
1172
1173/* fill in the variable parts of the header */
1174 hdr.track=unit[drive].track/unit[drive].type->heads;
1175 hdr.side=unit[drive].track%unit[drive].type->heads;
1176 hdr.sec=cnt+1;
1177 hdr.crc=dos_hdr_crc(&hdr);
1178
1179/* header (without "magic") and id gap 2*/
1180 dos_encode_block((ushort *)raw,(unsigned char *) &hdr.track,28);
1181 raw+=14;
1182
1183/*id gap 3 */
1184 for(i=0;i<6;i++)
1185 *raw++=0xaaaaaaaa;
1186
1187/* 3 syncs and 1 datamark */
1188 *raw++=0x44894489;
1189 *raw++=0x44895545;
1190
1191/* data */
1192 dos_encode_block((ushort *)raw,
1193 (unsigned char *)unit[drive].trackbuf+cnt*512,512);
1194 raw+=256;
1195
1196/*data crc + jd's special gap (long words :-/) */
1197 crc[0]=dos_data_crc(unit[drive].trackbuf+cnt*512);
1198 dos_encode_block((ushort *) raw,(unsigned char *)crc,4);
1199 raw+=2;
1200
1201/* data gap */
1202 for(i=0;i<38;i++)
1203 *raw++=0x92549254;
1204
1205 return raw; /* wrote 652 MFM words */
1206}
1207
1208static void dos_write(int disk)
1209{
1210 int cnt;
1211 unsigned long raw = (unsigned long) raw_buf;
1212 unsigned long *ptr=(unsigned long *)raw;
1213
1214 disk&=3;
1215/* really gap4 + indexgap , but we write it first and round it up */
1216 for (cnt=0;cnt<425;cnt++)
1217 *ptr++=0x92549254;
1218
1219/* the following is just guessed */
1220 if (unit[disk].type->sect_mult==2) /* check for HD-Disks */
1221 for(cnt=0;cnt<473;cnt++)
1222 *ptr++=0x92549254;
1223
1224/* now the index marks...*/
1225 for (cnt=0;cnt<20;cnt++)
1226 *ptr++=0x92549254;
1227 for (cnt=0;cnt<6;cnt++)
1228 *ptr++=0xaaaaaaaa;
1229 *ptr++=0x52245224;
1230 *ptr++=0x52245552;
1231 for (cnt=0;cnt<20;cnt++)
1232 *ptr++=0x92549254;
1233
1234/* sectors */
1235 for(cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++)
1236 ptr=ms_putsec(disk,ptr,cnt);
1237
1238 *(ushort *)ptr = 0xaaa8; /* MFM word before is always 0x9254 */
1239}
1240
1241/*
1242 * Here comes the high level stuff (i.e. the filesystem interface)
1243 * and helper functions.
1244 * Normally this should be the only part that has to be adapted to
1245 * different kernel versions.
1246 */
1247
1248/* FIXME: this assumes the drive is still spinning -
1249 * which is only true if we complete writing a track within three seconds
1250 */
1251static void flush_track_callback(unsigned long nr)
1252{
1253 nr&=3;
1254 writefromint = 1;
1255 if (!try_fdc(nr)) {
1256 /* we might block in an interrupt, so try again later */
1257 flush_track_timer[nr].expires = jiffies + 1;
1258 add_timer(flush_track_timer + nr);
1259 return;
1260 }
1261 get_fdc(nr);
1262 (*unit[nr].dtype->write_fkt)(nr);
1263 if (!raw_write(nr)) {
1264 printk (KERN_NOTICE "floppy disk write protected\n");
1265 writefromint = 0;
1266 writepending = 0;
1267 }
1268 rel_fdc();
1269}
1270
1271static int non_int_flush_track (unsigned long nr)
1272{
1273 unsigned long flags;
1274
1275 nr&=3;
1276 writefromint = 0;
1277 del_timer(&post_write_timer);
1278 get_fdc(nr);
1279 if (!fd_motor_on(nr)) {
1280 writepending = 0;
1281 rel_fdc();
1282 return 0;
1283 }
1284 local_irq_save(flags);
1285 if (writepending != 2) {
1286 local_irq_restore(flags);
1287 (*unit[nr].dtype->write_fkt)(nr);
1288 if (!raw_write(nr)) {
1289 printk (KERN_NOTICE "floppy disk write protected "
1290 "in write!\n");
1291 writepending = 0;
1292 return 0;
1293 }
1294 while (block_flag == 2)
1295 sleep_on (&wait_fd_block);
1296 }
1297 else {
1298 local_irq_restore(flags);
1299 ms_delay(2); /* 2 ms post_write delay */
1300 post_write(nr);
1301 }
1302 rel_fdc();
1303 return 1;
1304}
1305
1306static int get_track(int drive, int track)
1307{
1308 int error, errcnt;
1309
1310 drive&=3;
1311 if (unit[drive].track == track)
1312 return 0;
1313 get_fdc(drive);
1314 if (!fd_motor_on(drive)) {
1315 rel_fdc();
1316 return -1;
1317 }
1318
1319 if (unit[drive].dirty == 1) {
1320 del_timer (flush_track_timer + drive);
1321 non_int_flush_track (drive);
1322 }
1323 errcnt = 0;
1324 while (errcnt < MAX_ERRORS) {
1325 if (!fd_seek(drive, track))
1326 return -1;
1327 raw_read(drive);
1328 error = (*unit[drive].dtype->read_fkt)(drive);
1329 if (error == 0) {
1330 rel_fdc();
1331 return 0;
1332 }
1333 /* Read Error Handling: recalibrate and try again */
1334 unit[drive].track = -1;
1335 errcnt++;
1336 }
1337 rel_fdc();
1338 return -1;
1339}
1340
1341static void redo_fd_request(void)
1342{
1343 unsigned int cnt, block, track, sector;
1344 int drive;
1345 struct amiga_floppy_struct *floppy;
1346 char *data;
1347 unsigned long flags;
1348
1349 repeat:
1350 if (!CURRENT) {
1351 /* Nothing left to do */
1352 return;
1353 }
1354
1355 floppy = CURRENT->rq_disk->private_data;
1356 drive = floppy - unit;
1357
1358 /* Here someone could investigate to be more efficient */
1359 for (cnt = 0; cnt < CURRENT->current_nr_sectors; cnt++) {
1360#ifdef DEBUG
1361 printk("fd: sector %ld + %d requested for %s\n",
1362 CURRENT->sector,cnt,
1363 (CURRENT->cmd==READ)?"read":"write");
1364#endif
1365 block = CURRENT->sector + cnt;
1366 if ((int)block > floppy->blocks) {
1367 end_request(CURRENT, 0);
1368 goto repeat;
1369 }
1370
1371 track = block / (floppy->dtype->sects * floppy->type->sect_mult);
1372 sector = block % (floppy->dtype->sects * floppy->type->sect_mult);
1373 data = CURRENT->buffer + 512 * cnt;
1374#ifdef DEBUG
1375 printk("access to track %d, sector %d, with buffer at "
1376 "0x%08lx\n", track, sector, data);
1377#endif
1378
1379 if ((rq_data_dir(CURRENT) != READ) && (rq_data_dir(CURRENT) != WRITE)) {
1380 printk(KERN_WARNING "do_fd_request: unknown command\n");
1381 end_request(CURRENT, 0);
1382 goto repeat;
1383 }
1384 if (get_track(drive, track) == -1) {
1385 end_request(CURRENT, 0);
1386 goto repeat;
1387 }
1388
1389 switch (rq_data_dir(CURRENT)) {
1390 case READ:
1391 memcpy(data, floppy->trackbuf + sector * 512, 512);
1392 break;
1393
1394 case WRITE:
1395 memcpy(floppy->trackbuf + sector * 512, data, 512);
1396
1397 /* keep the drive spinning while writes are scheduled */
1398 if (!fd_motor_on(drive)) {
1399 end_request(CURRENT, 0);
1400 goto repeat;
1401 }
1402 /*
1403 * setup a callback to write the track buffer
1404 * after a short (1 tick) delay.
1405 */
1406 local_irq_save(flags);
1407
1408 floppy->dirty = 1;
1409 /* reset the timer */
1410 mod_timer (flush_track_timer + drive, jiffies + 1);
1411 local_irq_restore(flags);
1412 break;
1413 }
1414 }
1415 CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
1416 CURRENT->sector += CURRENT->current_nr_sectors;
1417
1418 end_request(CURRENT, 1);
1419 goto repeat;
1420}
1421
1422static void do_fd_request(request_queue_t * q)
1423{
1424 redo_fd_request();
1425}
1426
1427static int fd_ioctl(struct inode *inode, struct file *filp,
1428 unsigned int cmd, unsigned long param)
1429{
1430 int drive = iminor(inode) & 3;
1431 static struct floppy_struct getprm;
1432
1433 switch(cmd){
1434 case HDIO_GETGEO:
1435 {
1436 struct hd_geometry loc;
1437 loc.heads = unit[drive].type->heads;
1438 loc.sectors = unit[drive].dtype->sects * unit[drive].type->sect_mult;
1439 loc.cylinders = unit[drive].type->tracks;
1440 loc.start = 0;
1441 if (copy_to_user((void *)param, (void *)&loc,
1442 sizeof(struct hd_geometry)))
1443 return -EFAULT;
1444 break;
1445 }
1446 case FDFMTBEG:
1447 get_fdc(drive);
1448 if (fd_ref[drive] > 1) {
1449 rel_fdc();
1450 return -EBUSY;
1451 }
1452 fsync_bdev(inode->i_bdev);
1453 if (fd_motor_on(drive) == 0) {
1454 rel_fdc();
1455 return -ENODEV;
1456 }
1457 if (fd_calibrate(drive) == 0) {
1458 rel_fdc();
1459 return -ENXIO;
1460 }
1461 floppy_off(drive);
1462 rel_fdc();
1463 break;
1464 case FDFMTTRK:
1465 if (param < unit[drive].type->tracks * unit[drive].type->heads)
1466 {
1467 get_fdc(drive);
1468 if (fd_seek(drive,param) != 0){
1469 memset(unit[drive].trackbuf, FD_FILL_BYTE,
1470 unit[drive].dtype->sects * unit[drive].type->sect_mult * 512);
1471 non_int_flush_track(drive);
1472 }
1473 floppy_off(drive);
1474 rel_fdc();
1475 }
1476 else
1477 return -EINVAL;
1478 break;
1479 case FDFMTEND:
1480 floppy_off(drive);
1481 invalidate_bdev(inode->i_bdev, 0);
1482 break;
1483 case FDGETPRM:
1484 memset((void *)&getprm, 0, sizeof (getprm));
1485 getprm.track=unit[drive].type->tracks;
1486 getprm.head=unit[drive].type->heads;
1487 getprm.sect=unit[drive].dtype->sects * unit[drive].type->sect_mult;
1488 getprm.size=unit[drive].blocks;
1489 if (copy_to_user((void *)param,
1490 (void *)&getprm,
1491 sizeof(struct floppy_struct)))
1492 return -EFAULT;
1493 break;
1494 case FDSETPRM:
1495 case FDDEFPRM:
1496 return -EINVAL;
1497 case FDFLUSH: /* unconditionally, even if not needed */
1498 del_timer (flush_track_timer + drive);
1499 non_int_flush_track(drive);
1500 break;
1501#ifdef RAW_IOCTL
1502 case IOCTL_RAW_TRACK:
1503 if (copy_to_user((void *)param, raw_buf,
1504 unit[drive].type->read_size))
1505 return -EFAULT;
1506 else
1507 return unit[drive].type->read_size;
1508#endif
1509 default:
1510 printk(KERN_DEBUG "fd_ioctl: unknown cmd %d for drive %d.",
1511 cmd, drive);
1512 return -ENOSYS;
1513 }
1514 return 0;
1515}
1516
1517static void fd_probe(int dev)
1518{
1519 unsigned long code;
1520 int type;
1521 int drive;
1522
1523 drive = dev & 3;
1524 code = fd_get_drive_id(drive);
1525
1526 /* get drive type */
1527 for (type = 0; type < num_dr_types; type++)
1528 if (drive_types[type].code == code)
1529 break;
1530
1531 if (type >= num_dr_types) {
1532 printk(KERN_WARNING "fd_probe: unsupported drive type "
1533 "%08lx found\n", code);
1534 unit[drive].type = &drive_types[num_dr_types-1]; /* FD_NODRIVE */
1535 return;
1536 }
1537
1538 unit[drive].type = drive_types + type;
1539 unit[drive].track = -1;
1540
1541 unit[drive].disk = -1;
1542 unit[drive].motor = 0;
1543 unit[drive].busy = 0;
1544 unit[drive].status = -1;
1545}
1546
1547/*
1548 * floppy_open check for aliasing (/dev/fd0 can be the same as
1549 * /dev/PS0 etc), and disallows simultaneous access to the same
1550 * drive with different device numbers.
1551 */
1552static int floppy_open(struct inode *inode, struct file *filp)
1553{
1554 int drive = iminor(inode) & 3;
1555 int system = (iminor(inode) & 4) >> 2;
1556 int old_dev;
1557 unsigned long flags;
1558
1559 old_dev = fd_device[drive];
1560
1561 if (fd_ref[drive] && old_dev != system)
1562 return -EBUSY;
1563
1564 if (filp && filp->f_mode & 3) {
1565 check_disk_change(inode->i_bdev);
1566 if (filp->f_mode & 2 ) {
1567 int wrprot;
1568
1569 get_fdc(drive);
1570 fd_select (drive);
1571 wrprot = !(ciaa.pra & DSKPROT);
1572 fd_deselect (drive);
1573 rel_fdc();
1574
1575 if (wrprot)
1576 return -EROFS;
1577 }
1578 }
1579
1580 local_irq_save(flags);
1581 fd_ref[drive]++;
1582 fd_device[drive] = system;
1583 local_irq_restore(flags);
1584
1585 unit[drive].dtype=&data_types[system];
1586 unit[drive].blocks=unit[drive].type->heads*unit[drive].type->tracks*
1587 data_types[system].sects*unit[drive].type->sect_mult;
1588 set_capacity(unit[drive].gendisk, unit[drive].blocks);
1589
1590 printk(KERN_INFO "fd%d: accessing %s-disk with %s-layout\n",drive,
1591 unit[drive].type->name, data_types[system].name);
1592
1593 return 0;
1594}
1595
1596static int floppy_release(struct inode * inode, struct file * filp)
1597{
1598 int drive = iminor(inode) & 3;
1599
1600 if (unit[drive].dirty == 1) {
1601 del_timer (flush_track_timer + drive);
1602 non_int_flush_track (drive);
1603 }
1604
1605 if (!fd_ref[drive]--) {
1606 printk(KERN_CRIT "floppy_release with fd_ref == 0");
1607 fd_ref[drive] = 0;
1608 }
1609#ifdef MODULE
1610/* the mod_use counter is handled this way */
1611 floppy_off (drive | 0x40000000);
1612#endif
1613 return 0;
1614}
1615
1616/*
1617 * floppy-change is never called from an interrupt, so we can relax a bit
1618 * here, sleep etc. Note that floppy-on tries to set current_DOR to point
1619 * to the desired drive, but it will probably not survive the sleep if
1620 * several floppies are used at the same time: thus the loop.
1621 */
1622static int amiga_floppy_change(struct gendisk *disk)
1623{
1624 struct amiga_floppy_struct *p = disk->private_data;
1625 int drive = p - unit;
1626 int changed;
1627 static int first_time = 1;
1628
1629 if (first_time)
1630 changed = first_time--;
1631 else {
1632 get_fdc(drive);
1633 fd_select (drive);
1634 changed = !(ciaa.pra & DSKCHANGE);
1635 fd_deselect (drive);
1636 rel_fdc();
1637 }
1638
1639 if (changed) {
1640 fd_probe(drive);
1641 p->track = -1;
1642 p->dirty = 0;
1643 writepending = 0; /* if this was true before, too bad! */
1644 writefromint = 0;
1645 return 1;
1646 }
1647 return 0;
1648}
1649
1650static struct block_device_operations floppy_fops = {
1651 .owner = THIS_MODULE,
1652 .open = floppy_open,
1653 .release = floppy_release,
1654 .ioctl = fd_ioctl,
1655 .media_changed = amiga_floppy_change,
1656};
1657
1658void __init amiga_floppy_setup (char *str, int *ints)
1659{
1660 printk (KERN_INFO "amiflop: Setting default df0 to %x\n", ints[1]);
1661 fd_def_df0 = ints[1];
1662}
1663
1664static int __init fd_probe_drives(void)
1665{
1666 int drive,drives,nomem;
1667
1668 printk(KERN_INFO "FD: probing units\n" KERN_INFO "found ");
1669 drives=0;
1670 nomem=0;
1671 for(drive=0;drive<FD_MAX_UNITS;drive++) {
1672 struct gendisk *disk;
1673 fd_probe(drive);
1674 if (unit[drive].type->code == FD_NODRIVE)
1675 continue;
1676 disk = alloc_disk(1);
1677 if (!disk) {
1678 unit[drive].type->code = FD_NODRIVE;
1679 continue;
1680 }
1681 unit[drive].gendisk = disk;
1682 drives++;
1683 if ((unit[drive].trackbuf = kmalloc(FLOPPY_MAX_SECTORS * 512, GFP_KERNEL)) == NULL) {
1684 printk("no mem for ");
1685 unit[drive].type = &drive_types[num_dr_types - 1]; /* FD_NODRIVE */
1686 drives--;
1687 nomem = 1;
1688 }
1689 printk("fd%d ",drive);
1690 disk->major = FLOPPY_MAJOR;
1691 disk->first_minor = drive;
1692 disk->fops = &floppy_fops;
1693 sprintf(disk->disk_name, "fd%d", drive);
1694 disk->private_data = &unit[drive];
1695 disk->queue = floppy_queue;
1696 set_capacity(disk, 880*2);
1697 add_disk(disk);
1698 }
1699 if ((drives > 0) || (nomem == 0)) {
1700 if (drives == 0)
1701 printk("no drives");
1702 printk("\n");
1703 return drives;
1704 }
1705 printk("\n");
1706 return -ENOMEM;
1707}
1708
1709static struct kobject *floppy_find(dev_t dev, int *part, void *data)
1710{
1711 int drive = *part & 3;
1712 if (unit[drive].type->code == FD_NODRIVE)
1713 return NULL;
1714 *part = 0;
1715 return get_disk(unit[drive].gendisk);
1716}
1717
1718int __init amiga_floppy_init(void)
1719{
1720 int i, ret;
1721
1722 if (!AMIGAHW_PRESENT(AMI_FLOPPY))
1723 return -ENXIO;
1724
1725 if (register_blkdev(FLOPPY_MAJOR,"fd"))
1726 return -EBUSY;
1727
1728 /*
1729 * We request DSKPTR, DSKLEN and DSKDATA only, because the other
1730 * floppy registers are too spreaded over the custom register space
1731 */
1732 ret = -EBUSY;
1733 if (!request_mem_region(CUSTOM_PHYSADDR+0x20, 8, "amiflop [Paula]")) {
1734 printk("fd: cannot get floppy registers\n");
1735 goto out_blkdev;
1736 }
1737
1738 ret = -ENOMEM;
1739 if ((raw_buf = (char *)amiga_chip_alloc (RAW_BUF_SIZE, "Floppy")) ==
1740 NULL) {
1741 printk("fd: cannot get chip mem buffer\n");
1742 goto out_memregion;
1743 }
1744
1745 ret = -EBUSY;
1746 if (request_irq(IRQ_AMIGA_DSKBLK, fd_block_done, 0, "floppy_dma", NULL)) {
1747 printk("fd: cannot get irq for dma\n");
1748 goto out_irq;
1749 }
1750
1751 if (request_irq(IRQ_AMIGA_CIAA_TB, ms_isr, 0, "floppy_timer", NULL)) {
1752 printk("fd: cannot get irq for timer\n");
1753 goto out_irq2;
1754 }
1755
1756 ret = -ENOMEM;
1757 floppy_queue = blk_init_queue(do_fd_request, &amiflop_lock);
1758 if (!floppy_queue)
1759 goto out_queue;
1760
1761 ret = -ENXIO;
1762 if (fd_probe_drives() < 1) /* No usable drives */
1763 goto out_probe;
1764
1765 blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
1766 floppy_find, NULL, NULL);
1767
1768 /* initialize variables */
1769 init_timer(&motor_on_timer);
1770 motor_on_timer.expires = 0;
1771 motor_on_timer.data = 0;
1772 motor_on_timer.function = motor_on_callback;
1773 for (i = 0; i < FD_MAX_UNITS; i++) {
1774 init_timer(&motor_off_timer[i]);
1775 motor_off_timer[i].expires = 0;
1776 motor_off_timer[i].data = i|0x80000000;
1777 motor_off_timer[i].function = fd_motor_off;
1778 init_timer(&flush_track_timer[i]);
1779 flush_track_timer[i].expires = 0;
1780 flush_track_timer[i].data = i;
1781 flush_track_timer[i].function = flush_track_callback;
1782
1783 unit[i].track = -1;
1784 }
1785
1786 init_timer(&post_write_timer);
1787 post_write_timer.expires = 0;
1788 post_write_timer.data = 0;
1789 post_write_timer.function = post_write;
1790
1791 for (i = 0; i < 128; i++)
1792 mfmdecode[i]=255;
1793 for (i = 0; i < 16; i++)
1794 mfmdecode[mfmencode[i]]=i;
1795
1796 /* make sure that disk DMA is enabled */
1797 custom.dmacon = DMAF_SETCLR | DMAF_DISK;
1798
1799 /* init ms timer */
1800 ciaa.crb = 8; /* one-shot, stop */
1801 return 0;
1802
1803out_probe:
1804 blk_cleanup_queue(floppy_queue);
1805out_queue:
1806 free_irq(IRQ_AMIGA_CIAA_TB, NULL);
1807out_irq2:
1808 free_irq(IRQ_AMIGA_DSKBLK, NULL);
1809out_irq:
1810 amiga_chip_free(raw_buf);
1811out_memregion:
1812 release_mem_region(CUSTOM_PHYSADDR+0x20, 8);
1813out_blkdev:
1814 unregister_blkdev(FLOPPY_MAJOR,"fd");
1815 return ret;
1816}
1817
1818#ifdef MODULE
1819#include <linux/version.h>
1820
1821int init_module(void)
1822{
1823 if (!MACH_IS_AMIGA)
1824 return -ENXIO;
1825 return amiga_floppy_init();
1826}
1827
1828#if 0 /* not safe to unload */
1829void cleanup_module(void)
1830{
1831 int i;
1832
1833 for( i = 0; i < FD_MAX_UNITS; i++) {
1834 if (unit[i].type->code != FD_NODRIVE) {
1835 del_gendisk(unit[i].gendisk);
1836 put_disk(unit[i].gendisk);
1837 kfree(unit[i].trackbuf);
1838 }
1839 }
1840 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
1841 free_irq(IRQ_AMIGA_CIAA_TB, NULL);
1842 free_irq(IRQ_AMIGA_DSKBLK, NULL);
1843 custom.dmacon = DMAF_DISK; /* disable DMA */
1844 amiga_chip_free(raw_buf);
1845 blk_cleanup_queue(floppy_queue);
1846 release_mem_region(CUSTOM_PHYSADDR+0x20, 8);
1847 unregister_blkdev(FLOPPY_MAJOR, "fd");
1848}
1849#endif
1850#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-10 23:18:03 -0500