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/sched.h>
59 #include <linux/fs.h>
60 #include <linux/fcntl.h>
61 #include <linux/kernel.h>
62 #include <linux/timer.h>
63 #include <linux/fd.h>
64 #include <linux/hdreg.h>
65 #include <linux/errno.h>
66 #include <linux/types.h>
67 #include <linux/delay.h>
68 #include <linux/string.h>
69 #include <linux/slab.h>
70 #include <linux/init.h>
71 #include <linux/amifdreg.h>
72 #include <linux/amifd.h>
73 #include <linux/ioport.h>
74
75 #include <asm/setup.h>
76 #include <asm/uaccess.h>
77 #include <asm/amigahw.h>
78 #include <asm/amigaints.h>
79 #include <asm/irq.h>
80
81 #define MAJOR_NR FLOPPY_MAJOR
82 #include <linux/blk.h>
83
84 #undef DEBUG /* print _LOTS_ of infos */
85
86 #define RAW_IOCTL
87 #ifdef RAW_IOCTL
88 #define IOCTL_RAW_TRACK 0x5254524B /* 'RTRK' */
89 #endif
90
91 /*
92 * Defines
93 */
94
95 /*
96 * Error codes
97 */
98 #define FD_OK 0 /* operation succeeded */
99 #define FD_ERROR -1 /* general error (seek, read, write, etc) */
100 #define FD_NOUNIT 1 /* unit does not exist */
101 #define FD_UNITBUSY 2 /* unit already active */
102 #define FD_NOTACTIVE 3 /* unit is not active */
103 #define FD_NOTREADY 4 /* unit is not ready (motor not on/no disk) */
104
105 #define MFM_NOSYNC 1
106 #define MFM_HEADER 2
107 #define MFM_DATA 3
108 #define MFM_TRACK 4
109
110 /*
111 * Floppy ID values
112 */
113 #define FD_NODRIVE 0x00000000 /* response when no unit is present */
114 #define FD_DD_3 0xffffffff /* double-density 3.5" (880K) drive */
115 #define FD_HD_3 0x55555555 /* high-density 3.5" (1760K) drive */
116 #define FD_DD_5 0xaaaaaaaa /* double-density 5.25" (440K) drive */
117
118 static long int fd_def_df0 = FD_DD_3; /* default for df0 if it doesn't identify */
119
120 MODULE_PARM(fd_def_df0,"l");
121 MODULE_LICENSE("GPL");
122
123 /*
124 * Macros
125 */
126 #define MOTOR_ON (ciab.prb &= ~DSKMOTOR)
127 #define MOTOR_OFF (ciab.prb |= DSKMOTOR)
128 #define SELECT(mask) (ciab.prb &= ~mask)
129 #define DESELECT(mask) (ciab.prb |= mask)
130 #define SELMASK(drive) (1 << (3 + (drive & 3)))
131
132 static struct fd_drive_type drive_types[] = {
133 /* code name tr he rdsz wrsz sm pc1 pc2 sd st st*/
134 /* warning: times are now in milliseconds (ms) */
135 { FD_DD_3, "DD 3.5", 80, 2, 14716, 13630, 1, 80,161, 3, 18, 1},
136 { FD_HD_3, "HD 3.5", 80, 2, 28344, 27258, 2, 80,161, 3, 18, 1},
137 { FD_DD_5, "DD 5.25", 40, 2, 14716, 13630, 1, 40, 81, 6, 30, 2},
138 { FD_NODRIVE, "No Drive", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
139 };
140 static int num_dr_types = sizeof(drive_types) / sizeof(drive_types[0]);
141
142 /* defaults for 3 1/2" HD-Disks */
143 static int floppy_sizes[256]={880,880,880,880,720,720,720,720,};
144 static int floppy_blocksizes[256];
145 /* hardsector size assumed to be 512 */
146
147 static int amiga_read(int), dos_read(int);
148 static void amiga_write(int), dos_write(int);
149 static struct fd_data_type data_types[] = {
150 { "Amiga", 11 , amiga_read, amiga_write},
151 { "MS-Dos", 9, dos_read, dos_write}
152 };
153
154 /* current info on each unit */
155 static struct amiga_floppy_struct unit[FD_MAX_UNITS];
156
157 static struct timer_list flush_track_timer[FD_MAX_UNITS];
158 static struct timer_list post_write_timer;
159 static struct timer_list motor_on_timer;
160 static struct timer_list motor_off_timer[FD_MAX_UNITS];
161 static int on_attempts;
162
163 /* Synchronization of FDC access */
164 /* request loop (trackbuffer) */
165 static volatile int fdc_busy = -1;
166 static volatile int fdc_nested;
167 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
168
169 static DECLARE_WAIT_QUEUE_HEAD(motor_wait);
170
171 static volatile int selected = -1; /* currently selected drive */
172
173 static int writepending;
174 static int writefromint;
175 static char *raw_buf;
176
177 #define RAW_BUF_SIZE 30000 /* size of raw disk data */
178
179 /*
180 * These are global variables, as that's the easiest way to give
181 * information to interrupts. They are the data used for the current
182 * request.
183 */
184 static volatile char block_flag;
185 static DECLARE_WAIT_QUEUE_HEAD(wait_fd_block);
186
187 /* MS-Dos MFM Coding tables (should go quick and easy) */
188 static unsigned char mfmencode[16]={
189 0x2a, 0x29, 0x24, 0x25, 0x12, 0x11, 0x14, 0x15,
190 0x4a, 0x49, 0x44, 0x45, 0x52, 0x51, 0x54, 0x55
191 };
192 static unsigned char mfmdecode[128];
193
194 /* floppy internal millisecond timer stuff */
195 static volatile int ms_busy = -1;
196 static DECLARE_WAIT_QUEUE_HEAD(ms_wait);
197 #define MS_TICKS ((amiga_eclock+50)/1000)
198
199 /*
200 * Note that MAX_ERRORS=X doesn't imply that we retry every bad read
201 * max X times - some types of errors increase the errorcount by 2 or
202 * even 3, so we might actually retry only X/2 times before giving up.
203 */
204 #define MAX_ERRORS 12
205
206 /* Prevent "aliased" accesses. */
207 static int fd_ref[4] = { 0,0,0,0 };
208 static int fd_device[4] = { 0,0,0,0 };
209
210 /*
211 * Current device number. Taken either from the block header or from the
212 * format request descriptor.
213 */
214 #define CURRENT_DEVICE (CURRENT->rq_dev)
215
216 /* Current error count. */
217 #define CURRENT_ERRORS (CURRENT->errors)
218
219
220
221 /*
222 * Here come the actual hardware access and helper functions.
223 * They are not reentrant and single threaded because all drives
224 * share the same hardware and the same trackbuffer.
225 */
226
227 /* Milliseconds timer */
228
ms_isr(int irq,void * dummy,struct pt_regs * fp)229 static void ms_isr(int irq, void *dummy, struct pt_regs *fp)
230 {
231 ms_busy = -1;
232 wake_up(&ms_wait);
233 }
234
235 /* all waits are queued up
236 A more generic routine would do a schedule a la timer.device */
ms_delay(int ms)237 static void ms_delay(int ms)
238 {
239 unsigned long flags;
240 int ticks;
241 if (ms > 0) {
242 save_flags(flags);
243 cli();
244 while (ms_busy == 0)
245 sleep_on(&ms_wait);
246 ms_busy = 0;
247 restore_flags(flags);
248 ticks = MS_TICKS*ms-1;
249 ciaa.tblo=ticks%256;
250 ciaa.tbhi=ticks/256;
251 ciaa.crb=0x19; /*count eclock, force load, one-shoot, start */
252 sleep_on(&ms_wait);
253 }
254 }
255
256 /* Hardware semaphore */
257
258 /* returns true when we would get the semaphore */
try_fdc(int drive)259 static inline int try_fdc(int drive)
260 {
261 drive &= 3;
262 return ((fdc_busy < 0) || (fdc_busy == drive));
263 }
264
get_fdc(int drive)265 static void get_fdc(int drive)
266 {
267 unsigned long flags;
268
269 drive &= 3;
270 #ifdef DEBUG
271 printk("get_fdc: drive %d fdc_busy %d fdc_nested %d\n",drive,fdc_busy,fdc_nested);
272 #endif
273 save_flags(flags);
274 cli();
275 while (!try_fdc(drive))
276 sleep_on(&fdc_wait);
277 fdc_busy = drive;
278 fdc_nested++;
279 restore_flags(flags);
280 }
281
rel_fdc(void)282 static inline void rel_fdc(void)
283 {
284 #ifdef DEBUG
285 if (fdc_nested == 0)
286 printk("fd: unmatched rel_fdc\n");
287 printk("rel_fdc: fdc_busy %d fdc_nested %d\n",fdc_busy,fdc_nested);
288 #endif
289 fdc_nested--;
290 if (fdc_nested == 0) {
291 fdc_busy = -1;
292 wake_up(&fdc_wait);
293 }
294 }
295
fd_select(int drive)296 static void fd_select (int drive)
297 {
298 unsigned char prb = ~0;
299
300 drive&=3;
301 #ifdef DEBUG
302 printk("selecting %d\n",drive);
303 #endif
304 if (drive == selected)
305 return;
306 get_fdc(drive);
307 selected = drive;
308
309 if (unit[drive].track % 2 != 0)
310 prb &= ~DSKSIDE;
311 if (unit[drive].motor == 1)
312 prb &= ~DSKMOTOR;
313 ciab.prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
314 ciab.prb = prb;
315 prb &= ~SELMASK(drive);
316 ciab.prb = prb;
317 rel_fdc();
318 }
319
fd_deselect(int drive)320 static void fd_deselect (int drive)
321 {
322 unsigned char prb;
323 unsigned long flags;
324
325 drive&=3;
326 #ifdef DEBUG
327 printk("deselecting %d\n",drive);
328 #endif
329 if (drive != selected) {
330 printk(KERN_WARNING "Deselecting drive %d while %d was selected!\n",drive,selected);
331 return;
332 }
333
334 get_fdc(drive);
335 save_flags (flags);
336 cli();
337
338 selected = -1;
339
340 prb = ciab.prb;
341 prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
342 ciab.prb = prb;
343
344 restore_flags (flags);
345 rel_fdc();
346
347 }
348
motor_on_callback(unsigned long nr)349 static void motor_on_callback(unsigned long nr)
350 {
351 if (!(ciaa.pra & DSKRDY) || --on_attempts == 0) {
352 wake_up (&motor_wait);
353 } else {
354 motor_on_timer.expires = jiffies + HZ/10;
355 add_timer(&motor_on_timer);
356 }
357 }
358
fd_motor_on(int nr)359 static int fd_motor_on(int nr)
360 {
361 nr &= 3;
362
363 del_timer(motor_off_timer + nr);
364
365 if (!unit[nr].motor) {
366 unit[nr].motor = 1;
367 fd_select(nr);
368
369 motor_on_timer.data = nr;
370 mod_timer(&motor_on_timer, jiffies + HZ/2);
371
372 on_attempts = 10;
373 sleep_on (&motor_wait);
374 fd_deselect(nr);
375 }
376
377 if (on_attempts == 0) {
378 on_attempts = -1;
379 #if 0
380 printk (KERN_ERR "motor_on failed, turning motor off\n");
381 fd_motor_off (nr);
382 return 0;
383 #else
384 printk (KERN_WARNING "DSKRDY not set after 1.5 seconds - assuming drive is spinning notwithstanding\n");
385 #endif
386 }
387
388 return 1;
389 }
390
fd_motor_off(unsigned long drive)391 static void fd_motor_off(unsigned long drive)
392 {
393 long calledfromint;
394 #ifdef MODULE
395 long decusecount;
396
397 decusecount = drive & 0x40000000;
398 #endif
399 calledfromint = drive & 0x80000000;
400 drive&=3;
401 if (calledfromint && !try_fdc(drive)) {
402 /* We would be blocked in an interrupt, so try again later */
403 motor_off_timer[drive].expires = jiffies + 1;
404 add_timer(motor_off_timer + drive);
405 return;
406 }
407 unit[drive].motor = 0;
408 fd_select(drive);
409 udelay (1);
410 fd_deselect(drive);
411
412 #ifdef MODULE
413 /*
414 this is the last interrupt for any drive access, happens after
415 release (from floppy_off). So we have to wait until now to decrease
416 the use count.
417 */
418 if (decusecount)
419 MOD_DEC_USE_COUNT;
420 #endif
421 }
422
floppy_off(unsigned int nr)423 static void floppy_off (unsigned int nr)
424 {
425 int drive;
426
427 drive = nr & 3;
428 /* called this way it is always from interrupt */
429 motor_off_timer[drive].data = nr | 0x80000000;
430 mod_timer(motor_off_timer + drive, jiffies + 3*HZ);
431 }
432
fd_calibrate(int drive)433 static int fd_calibrate(int drive)
434 {
435 unsigned char prb;
436 int n;
437
438 drive &= 3;
439 get_fdc(drive);
440 if (!fd_motor_on (drive))
441 return 0;
442 fd_select (drive);
443 prb = ciab.prb;
444 prb |= DSKSIDE;
445 prb &= ~DSKDIREC;
446 ciab.prb = prb;
447 for (n = unit[drive].type->tracks/2; n != 0; --n) {
448 if (ciaa.pra & DSKTRACK0)
449 break;
450 prb &= ~DSKSTEP;
451 ciab.prb = prb;
452 prb |= DSKSTEP;
453 udelay (2);
454 ciab.prb = prb;
455 ms_delay(unit[drive].type->step_delay);
456 }
457 ms_delay (unit[drive].type->settle_time);
458 prb |= DSKDIREC;
459 n = unit[drive].type->tracks + 20;
460 for (;;) {
461 prb &= ~DSKSTEP;
462 ciab.prb = prb;
463 prb |= DSKSTEP;
464 udelay (2);
465 ciab.prb = prb;
466 ms_delay(unit[drive].type->step_delay + 1);
467 if ((ciaa.pra & DSKTRACK0) == 0)
468 break;
469 if (--n == 0) {
470 printk (KERN_ERR "fd%d: calibrate failed, turning motor off\n", drive);
471 fd_motor_off (drive);
472 unit[drive].track = -1;
473 rel_fdc();
474 return 0;
475 }
476 }
477 unit[drive].track = 0;
478 ms_delay(unit[drive].type->settle_time);
479
480 rel_fdc();
481 fd_deselect(drive);
482 return 1;
483 }
484
fd_seek(int drive,int track)485 static int fd_seek(int drive, int track)
486 {
487 unsigned char prb;
488 int cnt;
489
490 #ifdef DEBUG
491 printk("seeking drive %d to track %d\n",drive,track);
492 #endif
493 drive &= 3;
494 get_fdc(drive);
495 if (unit[drive].track == track) {
496 rel_fdc();
497 return 1;
498 }
499 if (!fd_motor_on(drive)) {
500 rel_fdc();
501 return 0;
502 }
503 if (unit[drive].track < 0 && !fd_calibrate(drive)) {
504 rel_fdc();
505 return 0;
506 }
507
508 fd_select (drive);
509 cnt = unit[drive].track/2 - track/2;
510 prb = ciab.prb;
511 prb |= DSKSIDE | DSKDIREC;
512 if (track % 2 != 0)
513 prb &= ~DSKSIDE;
514 if (cnt < 0) {
515 cnt = - cnt;
516 prb &= ~DSKDIREC;
517 }
518 ciab.prb = prb;
519 if (track % 2 != unit[drive].track % 2)
520 ms_delay (unit[drive].type->side_time);
521 unit[drive].track = track;
522 if (cnt == 0) {
523 rel_fdc();
524 fd_deselect(drive);
525 return 1;
526 }
527 do {
528 prb &= ~DSKSTEP;
529 ciab.prb = prb;
530 prb |= DSKSTEP;
531 udelay (1);
532 ciab.prb = prb;
533 ms_delay (unit[drive].type->step_delay);
534 } while (--cnt != 0);
535 ms_delay (unit[drive].type->settle_time);
536
537 rel_fdc();
538 fd_deselect(drive);
539 return 1;
540 }
541
fd_get_drive_id(int drive)542 static unsigned long fd_get_drive_id(int drive)
543 {
544 int i;
545 ulong id = 0;
546
547 drive&=3;
548 get_fdc(drive);
549 /* set up for ID */
550 MOTOR_ON;
551 udelay(2);
552 SELECT(SELMASK(drive));
553 udelay(2);
554 DESELECT(SELMASK(drive));
555 udelay(2);
556 MOTOR_OFF;
557 udelay(2);
558 SELECT(SELMASK(drive));
559 udelay(2);
560 DESELECT(SELMASK(drive));
561 udelay(2);
562
563 /* loop and read disk ID */
564 for (i=0; i<32; i++) {
565 SELECT(SELMASK(drive));
566 udelay(2);
567
568 /* read and store value of DSKRDY */
569 id <<= 1;
570 id |= (ciaa.pra & DSKRDY) ? 0 : 1; /* cia regs are low-active! */
571
572 DESELECT(SELMASK(drive));
573 }
574
575 rel_fdc();
576
577 /*
578 * RB: At least A500/A2000's df0: don't identify themselves.
579 * As every (real) Amiga has at least a 3.5" DD drive as df0:
580 * we default to that if df0: doesn't identify as a certain
581 * type.
582 */
583 if(drive == 0 && id == FD_NODRIVE)
584 {
585 id = fd_def_df0;
586 printk(KERN_NOTICE "fd: drive 0 didn't identify, setting default %08lx\n", (ulong)fd_def_df0);
587 }
588 /* return the ID value */
589 return (id);
590 }
591
fd_block_done(int irq,void * dummy,struct pt_regs * fp)592 static void fd_block_done(int irq, void *dummy, struct pt_regs *fp)
593 {
594 if (block_flag)
595 custom.dsklen = 0x4000;
596
597 if (block_flag == 2) { /* writing */
598 writepending = 2;
599 post_write_timer.expires = jiffies + 1; /* at least 2 ms */
600 post_write_timer.data = selected;
601 add_timer(&post_write_timer);
602 }
603 else { /* reading */
604 block_flag = 0;
605 wake_up (&wait_fd_block);
606 }
607 }
608
raw_read(int drive)609 static void raw_read(int drive)
610 {
611 drive&=3;
612 get_fdc(drive);
613 while (block_flag)
614 sleep_on(&wait_fd_block);
615 fd_select(drive);
616 /* setup adkcon bits correctly */
617 custom.adkcon = ADK_MSBSYNC;
618 custom.adkcon = ADK_SETCLR|ADK_WORDSYNC|ADK_FAST;
619
620 custom.dsksync = MFM_SYNC;
621
622 custom.dsklen = 0;
623 custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf);
624 custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN;
625 custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN;
626
627 block_flag = 1;
628
629 while (block_flag)
630 sleep_on (&wait_fd_block);
631
632 custom.dsklen = 0;
633 fd_deselect(drive);
634 rel_fdc();
635 }
636
raw_write(int drive)637 static int raw_write(int drive)
638 {
639 ushort adk;
640
641 drive&=3;
642 get_fdc(drive); /* corresponds to rel_fdc() in post_write() */
643 if ((ciaa.pra & DSKPROT) == 0) {
644 rel_fdc();
645 return 0;
646 }
647 while (block_flag)
648 sleep_on(&wait_fd_block);
649 fd_select(drive);
650 /* clear adkcon bits */
651 custom.adkcon = ADK_PRECOMP1|ADK_PRECOMP0|ADK_WORDSYNC|ADK_MSBSYNC;
652 /* set appropriate adkcon bits */
653 adk = ADK_SETCLR|ADK_FAST;
654 if ((ulong)unit[drive].track >= unit[drive].type->precomp2)
655 adk |= ADK_PRECOMP1;
656 else if ((ulong)unit[drive].track >= unit[drive].type->precomp1)
657 adk |= ADK_PRECOMP0;
658 custom.adkcon = adk;
659
660 custom.dsklen = DSKLEN_WRITE;
661 custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf);
662 custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE;
663 custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE;
664
665 block_flag = 2;
666 return 1;
667 }
668
669 /*
670 * to be called at least 2ms after the write has finished but before any
671 * other access to the hardware.
672 */
post_write(unsigned long drive)673 static void post_write (unsigned long drive)
674 {
675 #ifdef DEBUG
676 printk("post_write for drive %ld\n",drive);
677 #endif
678 drive &= 3;
679 custom.dsklen = 0;
680 block_flag = 0;
681 writepending = 0;
682 writefromint = 0;
683 unit[drive].dirty = 0;
684 wake_up(&wait_fd_block);
685 fd_deselect(drive);
686 rel_fdc(); /* corresponds to get_fdc() in raw_write */
687 }
688
689
690 /*
691 * The following functions are to convert the block contents into raw data
692 * written to disk and vice versa.
693 * (Add other formats here ;-))
694 */
695
scan_sync(unsigned long raw,unsigned long end)696 static unsigned long scan_sync(unsigned long raw, unsigned long end)
697 {
698 ushort *ptr = (ushort *)raw, *endp = (ushort *)end;
699
700 while (ptr < endp && *ptr++ != 0x4489)
701 ;
702 if (ptr < endp) {
703 while (*ptr == 0x4489 && ptr < endp)
704 ptr++;
705 return (ulong)ptr;
706 }
707 return 0;
708 }
709
checksum(unsigned long * addr,int len)710 static inline unsigned long checksum(unsigned long *addr, int len)
711 {
712 unsigned long csum = 0;
713
714 len /= sizeof(*addr);
715 while (len-- > 0)
716 csum ^= *addr++;
717 csum = ((csum>>1) & 0x55555555) ^ (csum & 0x55555555);
718
719 return csum;
720 }
721
decode(unsigned long * data,unsigned long * raw,int len)722 static unsigned long decode (unsigned long *data, unsigned long *raw,
723 int len)
724 {
725 ulong *odd, *even;
726
727 /* convert length from bytes to longwords */
728 len >>= 2;
729 odd = raw;
730 even = odd + len;
731
732 /* prepare return pointer */
733 raw += len * 2;
734
735 do {
736 *data++ = ((*odd++ & 0x55555555) << 1) | (*even++ & 0x55555555);
737 } while (--len != 0);
738
739 return (ulong)raw;
740 }
741
742 struct header {
743 unsigned char magic;
744 unsigned char track;
745 unsigned char sect;
746 unsigned char ord;
747 unsigned char labels[16];
748 unsigned long hdrchk;
749 unsigned long datachk;
750 };
751
amiga_read(int drive)752 static int amiga_read(int drive)
753 {
754 unsigned long raw;
755 unsigned long end;
756 int scnt;
757 unsigned long csum;
758 struct header hdr;
759
760 drive&=3;
761 raw = (long) raw_buf;
762 end = raw + unit[drive].type->read_size;
763
764 for (scnt = 0;scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) {
765 if (!(raw = scan_sync(raw, end))) {
766 printk (KERN_INFO "can't find sync for sector %d\n", scnt);
767 return MFM_NOSYNC;
768 }
769
770 raw = decode ((ulong *)&hdr.magic, (ulong *)raw, 4);
771 raw = decode ((ulong *)&hdr.labels, (ulong *)raw, 16);
772 raw = decode ((ulong *)&hdr.hdrchk, (ulong *)raw, 4);
773 raw = decode ((ulong *)&hdr.datachk, (ulong *)raw, 4);
774 csum = checksum((ulong *)&hdr,
775 (char *)&hdr.hdrchk-(char *)&hdr);
776
777 #ifdef DEBUG
778 printk ("(%x,%d,%d,%d) (%lx,%lx,%lx,%lx) %lx %lx\n",
779 hdr.magic, hdr.track, hdr.sect, hdr.ord,
780 *(ulong *)&hdr.labels[0], *(ulong *)&hdr.labels[4],
781 *(ulong *)&hdr.labels[8], *(ulong *)&hdr.labels[12],
782 hdr.hdrchk, hdr.datachk);
783 #endif
784
785 if (hdr.hdrchk != csum) {
786 printk(KERN_INFO "MFM_HEADER: %08lx,%08lx\n", hdr.hdrchk, csum);
787 return MFM_HEADER;
788 }
789
790 /* verify track */
791 if (hdr.track != unit[drive].track) {
792 printk(KERN_INFO "MFM_TRACK: %d, %d\n", hdr.track, unit[drive].track);
793 return MFM_TRACK;
794 }
795
796 raw = decode ((ulong *)(unit[drive].trackbuf + hdr.sect*512),
797 (ulong *)raw, 512);
798 csum = checksum((ulong *)(unit[drive].trackbuf + hdr.sect*512), 512);
799
800 if (hdr.datachk != csum) {
801 printk(KERN_INFO "MFM_DATA: (%x:%d:%d:%d) sc=%d %lx, %lx\n",
802 hdr.magic, hdr.track, hdr.sect, hdr.ord, scnt,
803 hdr.datachk, csum);
804 printk (KERN_INFO "data=(%lx,%lx,%lx,%lx)\n",
805 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[0],
806 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[1],
807 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[2],
808 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[3]);
809 return MFM_DATA;
810 }
811 }
812
813 return 0;
814 }
815
encode(unsigned long data,unsigned long * dest)816 static void encode(unsigned long data, unsigned long *dest)
817 {
818 unsigned long data2;
819
820 data &= 0x55555555;
821 data2 = data ^ 0x55555555;
822 data |= ((data2 >> 1) | 0x80000000) & (data2 << 1);
823
824 if (*(dest - 1) & 0x00000001)
825 data &= 0x7FFFFFFF;
826
827 *dest = data;
828 }
829
encode_block(unsigned long * dest,unsigned long * src,int len)830 static void encode_block(unsigned long *dest, unsigned long *src, int len)
831 {
832 int cnt, to_cnt = 0;
833 unsigned long data;
834
835 /* odd bits */
836 for (cnt = 0; cnt < len / 4; cnt++) {
837 data = src[cnt] >> 1;
838 encode(data, dest + to_cnt++);
839 }
840
841 /* even bits */
842 for (cnt = 0; cnt < len / 4; cnt++) {
843 data = src[cnt];
844 encode(data, dest + to_cnt++);
845 }
846 }
847
putsec(int disk,unsigned long * raw,int cnt)848 static unsigned long *putsec(int disk, unsigned long *raw, int cnt)
849 {
850 struct header hdr;
851 int i;
852
853 disk&=3;
854 *raw = (raw[-1]&1) ? 0x2AAAAAAA : 0xAAAAAAAA;
855 raw++;
856 *raw++ = 0x44894489;
857
858 hdr.magic = 0xFF;
859 hdr.track = unit[disk].track;
860 hdr.sect = cnt;
861 hdr.ord = unit[disk].dtype->sects * unit[disk].type->sect_mult - cnt;
862 for (i = 0; i < 16; i++)
863 hdr.labels[i] = 0;
864 hdr.hdrchk = checksum((ulong *)&hdr,
865 (char *)&hdr.hdrchk-(char *)&hdr);
866 hdr.datachk = checksum((ulong *)(unit[disk].trackbuf+cnt*512), 512);
867
868 encode_block(raw, (ulong *)&hdr.magic, 4);
869 raw += 2;
870 encode_block(raw, (ulong *)&hdr.labels, 16);
871 raw += 8;
872 encode_block(raw, (ulong *)&hdr.hdrchk, 4);
873 raw += 2;
874 encode_block(raw, (ulong *)&hdr.datachk, 4);
875 raw += 2;
876 encode_block(raw, (ulong *)(unit[disk].trackbuf+cnt*512), 512);
877 raw += 256;
878
879 return raw;
880 }
881
amiga_write(int disk)882 static void amiga_write(int disk)
883 {
884 unsigned int cnt;
885 unsigned long *ptr = (unsigned long *)raw_buf;
886
887 disk&=3;
888 /* gap space */
889 for (cnt = 0; cnt < 415 * unit[disk].type->sect_mult; cnt++)
890 *ptr++ = 0xaaaaaaaa;
891
892 /* sectors */
893 for (cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++)
894 ptr = putsec (disk, ptr, cnt);
895 *(ushort *)ptr = (ptr[-1]&1) ? 0x2AA8 : 0xAAA8;
896 }
897
898
899 struct dos_header {
900 unsigned char track, /* 0-80 */
901 side, /* 0-1 */
902 sec, /* 0-...*/
903 len_desc;/* 2 */
904 unsigned short crc; /* on 68000 we got an alignment problem,
905 but this compiler solves it by adding silently
906 adding a pad byte so data won't fit
907 and this took about 3h to discover.... */
908 unsigned char gap1[22]; /* for longword-alignedness (0x4e) */
909 };
910
911 /* crc routines are borrowed from the messydos-handler */
912
913 /* excerpt from the messydos-device
914 ; The CRC is computed not only over the actual data, but including
915 ; the SYNC mark (3 * $a1) and the 'ID/DATA - Address Mark' ($fe/$fb).
916 ; As we don't read or encode these fields into our buffers, we have to
917 ; preload the registers containing the CRC with the values they would have
918 ; after stepping over these fields.
919 ;
920 ; How CRCs "really" work:
921 ;
922 ; First, you should regard a bitstring as a series of coefficients of
923 ; polynomials. We calculate with these polynomials in modulo-2
924 ; arithmetic, in which both add and subtract are done the same as
925 ; exclusive-or. Now, we modify our data (a very long polynomial) in
926 ; such a way that it becomes divisible by the CCITT-standard 16-bit
927 ; 16 12 5
928 ; polynomial: x + x + x + 1, represented by $11021. The easiest
929 ; way to do this would be to multiply (using proper arithmetic) our
930 ; datablock with $11021. So we have:
931 ; data * $11021 =
932 ; data * ($10000 + $1021) =
933 ; data * $10000 + data * $1021
934 ; The left part of this is simple: Just add two 0 bytes. But then
935 ; the right part (data $1021) remains difficult and even could have
936 ; a carry into the left part. The solution is to use a modified
937 ; multiplication, which has a result that is not correct, but with
938 ; a difference of any multiple of $11021. We then only need to keep
939 ; the 16 least significant bits of the result.
940 ;
941 ; The following algorithm does this for us:
942 ;
943 ; unsigned char *data, c, crclo, crchi;
944 ; while (not done) {
945 ; c = *data++ + crchi;
946 ; crchi = (@ c) >> 8 + crclo;
947 ; crclo = @ c;
948 ; }
949 ;
950 ; Remember, + is done with EOR, the @ operator is in two tables (high
951 ; and low byte separately), which is calculated as
952 ;
953 ; $1021 * (c & $F0)
954 ; xor $1021 * (c & $0F)
955 ; xor $1021 * (c >> 4) (* is regular multiplication)
956 ;
957 ;
958 ; Anyway, the end result is the same as the remainder of the division of
959 ; the data by $11021. I am afraid I need to study theory a bit more...
960
961
962 my only works was to code this from manx to C....
963
964 */
965
dos_crc(void * data_a3,int data_d0,int data_d1,int data_d3)966 static ushort dos_crc(void * data_a3, int data_d0, int data_d1, int data_d3)
967 {
968 static unsigned char CRCTable1[] = {
969 0x00,0x10,0x20,0x30,0x40,0x50,0x60,0x70,0x81,0x91,0xa1,0xb1,0xc1,0xd1,0xe1,0xf1,
970 0x12,0x02,0x32,0x22,0x52,0x42,0x72,0x62,0x93,0x83,0xb3,0xa3,0xd3,0xc3,0xf3,0xe3,
971 0x24,0x34,0x04,0x14,0x64,0x74,0x44,0x54,0xa5,0xb5,0x85,0x95,0xe5,0xf5,0xc5,0xd5,
972 0x36,0x26,0x16,0x06,0x76,0x66,0x56,0x46,0xb7,0xa7,0x97,0x87,0xf7,0xe7,0xd7,0xc7,
973 0x48,0x58,0x68,0x78,0x08,0x18,0x28,0x38,0xc9,0xd9,0xe9,0xf9,0x89,0x99,0xa9,0xb9,
974 0x5a,0x4a,0x7a,0x6a,0x1a,0x0a,0x3a,0x2a,0xdb,0xcb,0xfb,0xeb,0x9b,0x8b,0xbb,0xab,
975 0x6c,0x7c,0x4c,0x5c,0x2c,0x3c,0x0c,0x1c,0xed,0xfd,0xcd,0xdd,0xad,0xbd,0x8d,0x9d,
976 0x7e,0x6e,0x5e,0x4e,0x3e,0x2e,0x1e,0x0e,0xff,0xef,0xdf,0xcf,0xbf,0xaf,0x9f,0x8f,
977 0x91,0x81,0xb1,0xa1,0xd1,0xc1,0xf1,0xe1,0x10,0x00,0x30,0x20,0x50,0x40,0x70,0x60,
978 0x83,0x93,0xa3,0xb3,0xc3,0xd3,0xe3,0xf3,0x02,0x12,0x22,0x32,0x42,0x52,0x62,0x72,
979 0xb5,0xa5,0x95,0x85,0xf5,0xe5,0xd5,0xc5,0x34,0x24,0x14,0x04,0x74,0x64,0x54,0x44,
980 0xa7,0xb7,0x87,0x97,0xe7,0xf7,0xc7,0xd7,0x26,0x36,0x06,0x16,0x66,0x76,0x46,0x56,
981 0xd9,0xc9,0xf9,0xe9,0x99,0x89,0xb9,0xa9,0x58,0x48,0x78,0x68,0x18,0x08,0x38,0x28,
982 0xcb,0xdb,0xeb,0xfb,0x8b,0x9b,0xab,0xbb,0x4a,0x5a,0x6a,0x7a,0x0a,0x1a,0x2a,0x3a,
983 0xfd,0xed,0xdd,0xcd,0xbd,0xad,0x9d,0x8d,0x7c,0x6c,0x5c,0x4c,0x3c,0x2c,0x1c,0x0c,
984 0xef,0xff,0xcf,0xdf,0xaf,0xbf,0x8f,0x9f,0x6e,0x7e,0x4e,0x5e,0x2e,0x3e,0x0e,0x1e
985 };
986
987 static unsigned char CRCTable2[] = {
988 0x00,0x21,0x42,0x63,0x84,0xa5,0xc6,0xe7,0x08,0x29,0x4a,0x6b,0x8c,0xad,0xce,0xef,
989 0x31,0x10,0x73,0x52,0xb5,0x94,0xf7,0xd6,0x39,0x18,0x7b,0x5a,0xbd,0x9c,0xff,0xde,
990 0x62,0x43,0x20,0x01,0xe6,0xc7,0xa4,0x85,0x6a,0x4b,0x28,0x09,0xee,0xcf,0xac,0x8d,
991 0x53,0x72,0x11,0x30,0xd7,0xf6,0x95,0xb4,0x5b,0x7a,0x19,0x38,0xdf,0xfe,0x9d,0xbc,
992 0xc4,0xe5,0x86,0xa7,0x40,0x61,0x02,0x23,0xcc,0xed,0x8e,0xaf,0x48,0x69,0x0a,0x2b,
993 0xf5,0xd4,0xb7,0x96,0x71,0x50,0x33,0x12,0xfd,0xdc,0xbf,0x9e,0x79,0x58,0x3b,0x1a,
994 0xa6,0x87,0xe4,0xc5,0x22,0x03,0x60,0x41,0xae,0x8f,0xec,0xcd,0x2a,0x0b,0x68,0x49,
995 0x97,0xb6,0xd5,0xf4,0x13,0x32,0x51,0x70,0x9f,0xbe,0xdd,0xfc,0x1b,0x3a,0x59,0x78,
996 0x88,0xa9,0xca,0xeb,0x0c,0x2d,0x4e,0x6f,0x80,0xa1,0xc2,0xe3,0x04,0x25,0x46,0x67,
997 0xb9,0x98,0xfb,0xda,0x3d,0x1c,0x7f,0x5e,0xb1,0x90,0xf3,0xd2,0x35,0x14,0x77,0x56,
998 0xea,0xcb,0xa8,0x89,0x6e,0x4f,0x2c,0x0d,0xe2,0xc3,0xa0,0x81,0x66,0x47,0x24,0x05,
999 0xdb,0xfa,0x99,0xb8,0x5f,0x7e,0x1d,0x3c,0xd3,0xf2,0x91,0xb0,0x57,0x76,0x15,0x34,
1000 0x4c,0x6d,0x0e,0x2f,0xc8,0xe9,0x8a,0xab,0x44,0x65,0x06,0x27,0xc0,0xe1,0x82,0xa3,
1001 0x7d,0x5c,0x3f,0x1e,0xf9,0xd8,0xbb,0x9a,0x75,0x54,0x37,0x16,0xf1,0xd0,0xb3,0x92,
1002 0x2e,0x0f,0x6c,0x4d,0xaa,0x8b,0xe8,0xc9,0x26,0x07,0x64,0x45,0xa2,0x83,0xe0,0xc1,
1003 0x1f,0x3e,0x5d,0x7c,0x9b,0xba,0xd9,0xf8,0x17,0x36,0x55,0x74,0x93,0xb2,0xd1,0xf0
1004 };
1005
1006 /* look at the asm-code - what looks in C a bit strange is almost as good as handmade */
1007 register int i;
1008 register unsigned char *CRCT1, *CRCT2, *data, c, crch, crcl;
1009
1010 CRCT1=CRCTable1;
1011 CRCT2=CRCTable2;
1012 data=data_a3;
1013 crcl=data_d1;
1014 crch=data_d0;
1015 for (i=data_d3; i>=0; i--) {
1016 c = (*data++) ^ crch;
1017 crch = CRCT1[c] ^ crcl;
1018 crcl = CRCT2[c];
1019 }
1020 return (crch<<8)|crcl;
1021 }
1022
dos_hdr_crc(struct dos_header * hdr)1023 static inline ushort dos_hdr_crc (struct dos_header *hdr)
1024 {
1025 return dos_crc(&(hdr->track), 0xb2, 0x30, 3); /* precomputed magic */
1026 }
1027
dos_data_crc(unsigned char * data)1028 static inline ushort dos_data_crc(unsigned char *data)
1029 {
1030 return dos_crc(data, 0xe2, 0x95 ,511); /* precomputed magic */
1031 }
1032
dos_decode_byte(ushort word)1033 static inline unsigned char dos_decode_byte(ushort word)
1034 {
1035 register ushort w2;
1036 register unsigned char byte;
1037 register unsigned char *dec = mfmdecode;
1038
1039 w2=word;
1040 w2>>=8;
1041 w2&=127;
1042 byte = dec[w2];
1043 byte <<= 4;
1044 w2 = word & 127;
1045 byte |= dec[w2];
1046 return byte;
1047 }
1048
dos_decode(unsigned char * data,unsigned short * raw,int len)1049 static unsigned long dos_decode(unsigned char *data, unsigned short *raw, int len)
1050 {
1051 int i;
1052
1053 for (i = 0; i < len; i++)
1054 *data++=dos_decode_byte(*raw++);
1055 return ((ulong)raw);
1056 }
1057
1058 #ifdef DEBUG
dbg(unsigned long ptr)1059 static void dbg(unsigned long ptr)
1060 {
1061 printk("raw data @%08lx: %08lx, %08lx ,%08lx, %08lx\n", ptr,
1062 ((ulong *)ptr)[0], ((ulong *)ptr)[1],
1063 ((ulong *)ptr)[2], ((ulong *)ptr)[3]);
1064 }
1065 #endif
1066
dos_read(int drive)1067 static int dos_read(int drive)
1068 {
1069 unsigned long end;
1070 unsigned long raw;
1071 int scnt;
1072 unsigned short crc,data_crc[2];
1073 struct dos_header hdr;
1074
1075 drive&=3;
1076 raw = (long) raw_buf;
1077 end = raw + unit[drive].type->read_size;
1078
1079 for (scnt=0; scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) {
1080 do { /* search for the right sync of each sec-hdr */
1081 if (!(raw = scan_sync (raw, end))) {
1082 printk(KERN_INFO "dos_read: no hdr sync on "
1083 "track %d, unit %d for sector %d\n",
1084 unit[drive].track,drive,scnt);
1085 return MFM_NOSYNC;
1086 }
1087 #ifdef DEBUG
1088 dbg(raw);
1089 #endif
1090 } while (*((ushort *)raw)!=0x5554); /* loop usually only once done */
1091 raw+=2; /* skip over headermark */
1092 raw = dos_decode((unsigned char *)&hdr,(ushort *) raw,8);
1093 crc = dos_hdr_crc(&hdr);
1094
1095 #ifdef DEBUG
1096 printk("(%3d,%d,%2d,%d) %x\n", hdr.track, hdr.side,
1097 hdr.sec, hdr.len_desc, hdr.crc);
1098 #endif
1099
1100 if (crc != hdr.crc) {
1101 printk(KERN_INFO "dos_read: MFM_HEADER %04x,%04x\n",
1102 hdr.crc, crc);
1103 return MFM_HEADER;
1104 }
1105 if (hdr.track != unit[drive].track/unit[drive].type->heads) {
1106 printk(KERN_INFO "dos_read: MFM_TRACK %d, %d\n",
1107 hdr.track,
1108 unit[drive].track/unit[drive].type->heads);
1109 return MFM_TRACK;
1110 }
1111
1112 if (hdr.side != unit[drive].track%unit[drive].type->heads) {
1113 printk(KERN_INFO "dos_read: MFM_SIDE %d, %d\n",
1114 hdr.side,
1115 unit[drive].track%unit[drive].type->heads);
1116 return MFM_TRACK;
1117 }
1118
1119 if (hdr.len_desc != 2) {
1120 printk(KERN_INFO "dos_read: unknown sector len "
1121 "descriptor %d\n", hdr.len_desc);
1122 return MFM_DATA;
1123 }
1124 #ifdef DEBUG
1125 printk("hdr accepted\n");
1126 #endif
1127 if (!(raw = scan_sync (raw, end))) {
1128 printk(KERN_INFO "dos_read: no data sync on track "
1129 "%d, unit %d for sector%d, disk sector %d\n",
1130 unit[drive].track, drive, scnt, hdr.sec);
1131 return MFM_NOSYNC;
1132 }
1133 #ifdef DEBUG
1134 dbg(raw);
1135 #endif
1136
1137 if (*((ushort *)raw)!=0x5545) {
1138 printk(KERN_INFO "dos_read: no data mark after "
1139 "sync (%d,%d,%d,%d) sc=%d\n",
1140 hdr.track,hdr.side,hdr.sec,hdr.len_desc,scnt);
1141 return MFM_NOSYNC;
1142 }
1143
1144 raw+=2; /* skip data mark (included in checksum) */
1145 raw = dos_decode((unsigned char *)(unit[drive].trackbuf + (hdr.sec - 1) * 512), (ushort *) raw, 512);
1146 raw = dos_decode((unsigned char *)data_crc,(ushort *) raw,4);
1147 crc = dos_data_crc(unit[drive].trackbuf + (hdr.sec - 1) * 512);
1148
1149 if (crc != data_crc[0]) {
1150 printk(KERN_INFO "dos_read: MFM_DATA (%d,%d,%d,%d) "
1151 "sc=%d, %x %x\n", hdr.track, hdr.side,
1152 hdr.sec, hdr.len_desc, scnt,data_crc[0], crc);
1153 printk(KERN_INFO "data=(%lx,%lx,%lx,%lx,...)\n",
1154 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[0],
1155 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[1],
1156 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[2],
1157 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[3]);
1158 return MFM_DATA;
1159 }
1160 }
1161 return 0;
1162 }
1163
dos_encode_byte(unsigned char byte)1164 static inline ushort dos_encode_byte(unsigned char byte)
1165 {
1166 register unsigned char *enc, b2, b1;
1167 register ushort word;
1168
1169 enc=mfmencode;
1170 b1=byte;
1171 b2=b1>>4;
1172 b1&=15;
1173 word=enc[b2] <<8 | enc [b1];
1174 return (word|((word&(256|64)) ? 0: 128));
1175 }
1176
dos_encode_block(ushort * dest,unsigned char * src,int len)1177 static void dos_encode_block(ushort *dest, unsigned char *src, int len)
1178 {
1179 int i;
1180
1181 for (i = 0; i < len; i++) {
1182 *dest=dos_encode_byte(*src++);
1183 *dest|=((dest[-1]&1)||(*dest&0x4000))? 0: 0x8000;
1184 dest++;
1185 }
1186 }
1187
ms_putsec(int drive,unsigned long * raw,int cnt)1188 static unsigned long *ms_putsec(int drive, unsigned long *raw, int cnt)
1189 {
1190 static struct dos_header hdr={0,0,0,2,0,
1191 {78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78}};
1192 int i;
1193 static ushort crc[2]={0,0x4e4e};
1194
1195 drive&=3;
1196 /* id gap 1 */
1197 /* the MFM word before is always 9254 */
1198 for(i=0;i<6;i++)
1199 *raw++=0xaaaaaaaa;
1200 /* 3 sync + 1 headermark */
1201 *raw++=0x44894489;
1202 *raw++=0x44895554;
1203
1204 /* fill in the variable parts of the header */
1205 hdr.track=unit[drive].track/unit[drive].type->heads;
1206 hdr.side=unit[drive].track%unit[drive].type->heads;
1207 hdr.sec=cnt+1;
1208 hdr.crc=dos_hdr_crc(&hdr);
1209
1210 /* header (without "magic") and id gap 2*/
1211 dos_encode_block((ushort *)raw,(unsigned char *) &hdr.track,28);
1212 raw+=14;
1213
1214 /*id gap 3 */
1215 for(i=0;i<6;i++)
1216 *raw++=0xaaaaaaaa;
1217
1218 /* 3 syncs and 1 datamark */
1219 *raw++=0x44894489;
1220 *raw++=0x44895545;
1221
1222 /* data */
1223 dos_encode_block((ushort *)raw,
1224 (unsigned char *)unit[drive].trackbuf+cnt*512,512);
1225 raw+=256;
1226
1227 /*data crc + jd's special gap (long words :-/) */
1228 crc[0]=dos_data_crc(unit[drive].trackbuf+cnt*512);
1229 dos_encode_block((ushort *) raw,(unsigned char *)crc,4);
1230 raw+=2;
1231
1232 /* data gap */
1233 for(i=0;i<38;i++)
1234 *raw++=0x92549254;
1235
1236 return raw; /* wrote 652 MFM words */
1237 }
1238
dos_write(int disk)1239 static void dos_write(int disk)
1240 {
1241 int cnt;
1242 unsigned long raw = (unsigned long) raw_buf;
1243 unsigned long *ptr=(unsigned long *)raw;
1244
1245 disk&=3;
1246 /* really gap4 + indexgap , but we write it first and round it up */
1247 for (cnt=0;cnt<425;cnt++)
1248 *ptr++=0x92549254;
1249
1250 /* the following is just guessed */
1251 if (unit[disk].type->sect_mult==2) /* check for HD-Disks */
1252 for(cnt=0;cnt<473;cnt++)
1253 *ptr++=0x92549254;
1254
1255 /* now the index marks...*/
1256 for (cnt=0;cnt<20;cnt++)
1257 *ptr++=0x92549254;
1258 for (cnt=0;cnt<6;cnt++)
1259 *ptr++=0xaaaaaaaa;
1260 *ptr++=0x52245224;
1261 *ptr++=0x52245552;
1262 for (cnt=0;cnt<20;cnt++)
1263 *ptr++=0x92549254;
1264
1265 /* sectors */
1266 for(cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++)
1267 ptr=ms_putsec(disk,ptr,cnt);
1268
1269 *(ushort *)ptr = 0xaaa8; /* MFM word before is always 0x9254 */
1270 }
1271
1272 /*
1273 * Here comes the high level stuff (i.e. the filesystem interface)
1274 * and helper functions.
1275 * Normally this should be the only part that has to be adapted to
1276 * different kernel versions.
1277 */
1278
1279 /* FIXME: this assumes the drive is still spinning -
1280 * which is only true if we complete writing a track within three seconds
1281 */
flush_track_callback(unsigned long nr)1282 static void flush_track_callback(unsigned long nr)
1283 {
1284 nr&=3;
1285 writefromint = 1;
1286 if (!try_fdc(nr)) {
1287 /* we might block in an interrupt, so try again later */
1288 flush_track_timer[nr].expires = jiffies + 1;
1289 add_timer(flush_track_timer + nr);
1290 return;
1291 }
1292 get_fdc(nr);
1293 (*unit[nr].dtype->write_fkt)(nr);
1294 if (!raw_write(nr)) {
1295 printk (KERN_NOTICE "floppy disk write protected\n");
1296 writefromint = 0;
1297 writepending = 0;
1298 }
1299 rel_fdc();
1300 }
1301
non_int_flush_track(unsigned long nr)1302 static int non_int_flush_track (unsigned long nr)
1303 {
1304 unsigned long flags;
1305
1306 nr&=3;
1307 writefromint = 0;
1308 del_timer(&post_write_timer);
1309 get_fdc(nr);
1310 if (!fd_motor_on(nr)) {
1311 writepending = 0;
1312 rel_fdc();
1313 return 0;
1314 }
1315 save_flags(flags);
1316 cli();
1317 if (writepending != 2) {
1318 restore_flags(flags);
1319 (*unit[nr].dtype->write_fkt)(nr);
1320 if (!raw_write(nr)) {
1321 printk (KERN_NOTICE "floppy disk write protected "
1322 "in write!\n");
1323 writepending = 0;
1324 return 0;
1325 }
1326 while (block_flag == 2)
1327 sleep_on (&wait_fd_block);
1328 }
1329 else {
1330 restore_flags(flags);
1331 ms_delay(2); /* 2 ms post_write delay */
1332 post_write(nr);
1333 }
1334 rel_fdc();
1335 return 1;
1336 }
1337
get_track(int drive,int track)1338 static int get_track(int drive, int track)
1339 {
1340 int error, errcnt;
1341
1342 drive&=3;
1343 if (unit[drive].track == track)
1344 return 0;
1345 get_fdc(drive);
1346 if (!fd_motor_on(drive)) {
1347 rel_fdc();
1348 return -1;
1349 }
1350
1351 if (unit[drive].dirty == 1) {
1352 del_timer (flush_track_timer + drive);
1353 non_int_flush_track (drive);
1354 }
1355 errcnt = 0;
1356 while (errcnt < MAX_ERRORS) {
1357 if (!fd_seek(drive, track))
1358 return -1;
1359 raw_read(drive);
1360 error = (*unit[drive].dtype->read_fkt)(drive);
1361 if (error == 0) {
1362 rel_fdc();
1363 return 0;
1364 }
1365 /* Read Error Handling: recalibrate and try again */
1366 unit[drive].track = -1;
1367 errcnt++;
1368 }
1369 rel_fdc();
1370 return -1;
1371 }
1372
redo_fd_request(void)1373 static void redo_fd_request(void)
1374 {
1375 unsigned int cnt, block, track, sector;
1376 int device, drive;
1377 struct amiga_floppy_struct *floppy;
1378 char *data;
1379 unsigned long flags;
1380
1381 if (!QUEUE_EMPTY && CURRENT->rq_status == RQ_INACTIVE){
1382 return;
1383 }
1384
1385 repeat:
1386 if (QUEUE_EMPTY) {
1387 /* Nothing left to do */
1388 return;
1389 }
1390
1391 if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
1392 panic(DEVICE_NAME ": request list destroyed");
1393
1394 if (CURRENT->bh && !buffer_locked(CURRENT->bh))
1395 panic(DEVICE_NAME ": block not locked");
1396
1397 device = MINOR(CURRENT_DEVICE);
1398 if (device < 8) {
1399 /* manual selection */
1400 drive = device & 3;
1401 floppy = unit + drive;
1402 } else {
1403 /* Auto-detection */
1404 #ifdef DEBUG
1405 printk("redo_fd_request: can't handle auto detect\n");
1406 printk("redo_fd_request: default to normal\n");
1407 #endif
1408 drive = device & 3;
1409 floppy = unit + drive;
1410 }
1411
1412 /* Here someone could investigate to be more efficient */
1413 for (cnt = 0; cnt < CURRENT->current_nr_sectors; cnt++) {
1414 #ifdef DEBUG
1415 printk("fd: sector %ld + %d requested for %s\n",
1416 CURRENT->sector,cnt,
1417 (CURRENT->cmd==READ)?"read":"write");
1418 #endif
1419 block = CURRENT->sector + cnt;
1420 if ((int)block > floppy->blocks) {
1421 end_request(0);
1422 goto repeat;
1423 }
1424
1425 track = block / (floppy->dtype->sects * floppy->type->sect_mult);
1426 sector = block % (floppy->dtype->sects * floppy->type->sect_mult);
1427 data = CURRENT->buffer + 512 * cnt;
1428 #ifdef DEBUG
1429 printk("access to track %d, sector %d, with buffer at "
1430 "0x%08lx\n", track, sector, data);
1431 #endif
1432
1433 if ((CURRENT->cmd != READ) && (CURRENT->cmd != WRITE)) {
1434 printk(KERN_WARNING "do_fd_request: unknown command\n");
1435 end_request(0);
1436 goto repeat;
1437 }
1438 if (get_track(drive, track) == -1) {
1439 end_request(0);
1440 goto repeat;
1441 }
1442
1443 switch (CURRENT->cmd) {
1444 case READ:
1445 memcpy(data, unit[drive].trackbuf + sector * 512, 512);
1446 break;
1447
1448 case WRITE:
1449 memcpy(unit[drive].trackbuf + sector * 512, data, 512);
1450
1451 /* keep the drive spinning while writes are scheduled */
1452 if (!fd_motor_on(drive)) {
1453 end_request(0);
1454 goto repeat;
1455 }
1456 /*
1457 * setup a callback to write the track buffer
1458 * after a short (1 tick) delay.
1459 */
1460 save_flags (flags);
1461 cli();
1462
1463 unit[drive].dirty = 1;
1464 /* reset the timer */
1465 mod_timer(flush_track_timer + drive, jiffies + 1);
1466 restore_flags (flags);
1467 break;
1468 }
1469 }
1470 CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
1471 CURRENT->sector += CURRENT->current_nr_sectors;
1472
1473 end_request(1);
1474 goto repeat;
1475 }
1476
do_fd_request(request_queue_t * q)1477 static void do_fd_request(request_queue_t * q)
1478 {
1479 redo_fd_request();
1480 }
1481
fd_ioctl(struct inode * inode,struct file * filp,unsigned int cmd,unsigned long param)1482 static int fd_ioctl(struct inode *inode, struct file *filp,
1483 unsigned int cmd, unsigned long param)
1484 {
1485 int drive = inode->i_rdev & 3;
1486 static struct floppy_struct getprm;
1487
1488 switch(cmd){
1489 case HDIO_GETGEO:
1490 {
1491 struct hd_geometry loc;
1492 loc.heads = unit[drive].type->heads;
1493 loc.sectors = unit[drive].dtype->sects * unit[drive].type->sect_mult;
1494 loc.cylinders = unit[drive].type->tracks;
1495 loc.start = 0;
1496 if (copy_to_user((void *)param, (void *)&loc,
1497 sizeof(struct hd_geometry)))
1498 return -EFAULT;
1499 break;
1500 }
1501 case FDFMTBEG:
1502 get_fdc(drive);
1503 if (fd_ref[drive] > 1) {
1504 rel_fdc();
1505 return -EBUSY;
1506 }
1507 fsync_dev(inode->i_rdev);
1508 if (fd_motor_on(drive) == 0) {
1509 rel_fdc();
1510 return -ENODEV;
1511 }
1512 if (fd_calibrate(drive) == 0) {
1513 rel_fdc();
1514 return -ENXIO;
1515 }
1516 floppy_off(drive);
1517 rel_fdc();
1518 break;
1519 case FDFMTTRK:
1520 if (param < unit[drive].type->tracks * unit[drive].type->heads)
1521 {
1522 get_fdc(drive);
1523 if (fd_seek(drive,param) != 0){
1524 memset(unit[drive].trackbuf, FD_FILL_BYTE,
1525 unit[drive].dtype->sects * unit[drive].type->sect_mult * 512);
1526 non_int_flush_track(drive);
1527 }
1528 floppy_off(drive);
1529 rel_fdc();
1530 }
1531 else
1532 return -EINVAL;
1533 break;
1534 case FDFMTEND:
1535 floppy_off(drive);
1536 invalidate_device(inode->i_rdev, 0);
1537 break;
1538 case FDGETPRM:
1539 memset((void *)&getprm, 0, sizeof (getprm));
1540 getprm.track=unit[drive].type->tracks;
1541 getprm.head=unit[drive].type->heads;
1542 getprm.sect=unit[drive].dtype->sects * unit[drive].type->sect_mult;
1543 getprm.size=unit[drive].blocks;
1544 if (copy_to_user((void *)param,
1545 (void *)&getprm,
1546 sizeof(struct floppy_struct)))
1547 return -EFAULT;
1548 break;
1549 case BLKGETSIZE:
1550 return put_user(unit[drive].blocks,(unsigned long *)param);
1551 break;
1552 case BLKGETSIZE64:
1553 return put_user((u64)unit[drive].blocks << 9, (u64 *)param);
1554 break;
1555 case FDSETPRM:
1556 case FDDEFPRM:
1557 return -EINVAL;
1558 case FDFLUSH: /* unconditionally, even if not needed */
1559 del_timer (flush_track_timer + drive);
1560 non_int_flush_track(drive);
1561 break;
1562 #ifdef RAW_IOCTL
1563 case IOCTL_RAW_TRACK:
1564 if (copy_to_user((void *)param, raw_buf,
1565 unit[drive].type->read_size))
1566 return -EFAULT;
1567 else
1568 return unit[drive].type->read_size;
1569 #endif
1570 default:
1571 printk(KERN_DEBUG "fd_ioctl: unknown cmd %d for drive %d.",
1572 cmd, drive);
1573 return -ENOSYS;
1574 }
1575 return 0;
1576 }
1577
fd_probe(int dev)1578 static void fd_probe(int dev)
1579 {
1580 unsigned long code;
1581 int type;
1582 int drive;
1583
1584 drive = dev & 3;
1585 code = fd_get_drive_id(drive);
1586
1587 /* get drive type */
1588 for (type = 0; type < num_dr_types; type++)
1589 if (drive_types[type].code == code)
1590 break;
1591
1592 if (type >= num_dr_types) {
1593 printk(KERN_WARNING "fd_probe: unsupported drive type "
1594 "%08lx found\n", code);
1595 unit[drive].type = &drive_types[num_dr_types-1]; /* FD_NODRIVE */
1596 return;
1597 }
1598
1599 unit[drive].type = drive_types + type;
1600 unit[drive].track = -1;
1601
1602 unit[drive].disk = -1;
1603 unit[drive].motor = 0;
1604 unit[drive].busy = 0;
1605 unit[drive].status = -1;
1606 }
1607
1608 /*
1609 * floppy_open check for aliasing (/dev/fd0 can be the same as
1610 * /dev/PS0 etc), and disallows simultaneous access to the same
1611 * drive with different device numbers.
1612 */
floppy_open(struct inode * inode,struct file * filp)1613 static int floppy_open(struct inode *inode, struct file *filp)
1614 {
1615 int drive;
1616 int old_dev;
1617 int system;
1618 unsigned long flags;
1619
1620 drive = MINOR(inode->i_rdev) & 3;
1621 old_dev = fd_device[drive];
1622
1623 if (fd_ref[drive])
1624 if (old_dev != inode->i_rdev)
1625 return -EBUSY;
1626
1627 if (unit[drive].type->code == FD_NODRIVE)
1628 return -ENODEV;
1629
1630 if (filp && filp->f_mode & 3) {
1631 check_disk_change(inode->i_rdev);
1632 if (filp->f_mode & 2 ) {
1633 int wrprot;
1634
1635 get_fdc(drive);
1636 fd_select (drive);
1637 wrprot = !(ciaa.pra & DSKPROT);
1638 fd_deselect (drive);
1639 rel_fdc();
1640
1641 if (wrprot)
1642 return -EROFS;
1643 }
1644 }
1645
1646 save_flags(flags);
1647 cli();
1648 fd_ref[drive]++;
1649 fd_device[drive] = inode->i_rdev;
1650 #ifdef MODULE
1651 if (unit[drive].motor == 0)
1652 MOD_INC_USE_COUNT;
1653 #endif
1654 restore_flags(flags);
1655
1656 if (old_dev && old_dev != inode->i_rdev)
1657 invalidate_buffers(old_dev);
1658
1659 system=(inode->i_rdev & 4)>>2;
1660 unit[drive].dtype=&data_types[system];
1661 unit[drive].blocks=unit[drive].type->heads*unit[drive].type->tracks*
1662 data_types[system].sects*unit[drive].type->sect_mult;
1663 floppy_sizes[MINOR(inode->i_rdev)] = unit[drive].blocks >> 1;
1664
1665 printk(KERN_INFO "fd%d: accessing %s-disk with %s-layout\n",drive,
1666 unit[drive].type->name, data_types[system].name);
1667
1668 return 0;
1669 }
1670
floppy_release(struct inode * inode,struct file * filp)1671 static int floppy_release(struct inode * inode, struct file * filp)
1672 {
1673 int drive = MINOR(inode->i_rdev) & 3;
1674
1675 if (unit[drive].dirty == 1) {
1676 del_timer (flush_track_timer + drive);
1677 non_int_flush_track (drive);
1678 }
1679
1680 if (!fd_ref[drive]--) {
1681 printk(KERN_CRIT "floppy_release with fd_ref == 0");
1682 fd_ref[drive] = 0;
1683 }
1684 #ifdef MODULE
1685 /* the mod_use counter is handled this way */
1686 floppy_off (drive | 0x40000000);
1687 #endif
1688 return 0;
1689 }
1690
1691 /*
1692 * floppy-change is never called from an interrupt, so we can relax a bit
1693 * here, sleep etc. Note that floppy-on tries to set current_DOR to point
1694 * to the desired drive, but it will probably not survive the sleep if
1695 * several floppies are used at the same time: thus the loop.
1696 */
amiga_floppy_change(kdev_t dev)1697 static int amiga_floppy_change(kdev_t dev)
1698 {
1699 int drive = MINOR(dev) & 3;
1700 int changed;
1701 static int first_time = 1;
1702
1703 if (MAJOR(dev) != MAJOR_NR) {
1704 printk(KERN_CRIT "floppy_change: not a floppy\n");
1705 return 0;
1706 }
1707
1708 if (first_time)
1709 changed = first_time--;
1710 else {
1711 get_fdc(drive);
1712 fd_select (drive);
1713 changed = !(ciaa.pra & DSKCHANGE);
1714 fd_deselect (drive);
1715 rel_fdc();
1716 }
1717
1718 if (changed) {
1719 fd_probe(drive);
1720 unit[drive].track = -1;
1721 unit[drive].dirty = 0;
1722 writepending = 0; /* if this was true before, too bad! */
1723 writefromint = 0;
1724 return 1;
1725 }
1726 return 0;
1727 }
1728
1729 static struct block_device_operations floppy_fops = {
1730 owner: THIS_MODULE,
1731 open: floppy_open,
1732 release: floppy_release,
1733 ioctl: fd_ioctl,
1734 check_media_change: amiga_floppy_change,
1735 };
1736
amiga_floppy_setup(char * str,int * ints)1737 void __init amiga_floppy_setup (char *str, int *ints)
1738 {
1739 printk (KERN_INFO "amiflop: Setting default df0 to %x\n", ints[1]);
1740 fd_def_df0 = ints[1];
1741 }
1742
fd_probe_drives(void)1743 static int __init fd_probe_drives(void)
1744 {
1745 int drive,drives,nomem;
1746
1747 printk(KERN_INFO "FD: probing units\n" KERN_INFO "found ");
1748 drives=0;
1749 nomem=0;
1750 for(drive=0;drive<FD_MAX_UNITS;drive++) {
1751 fd_probe(drive);
1752 if (unit[drive].type->code != FD_NODRIVE) {
1753 drives++;
1754 if ((unit[drive].trackbuf = kmalloc(FLOPPY_MAX_SECTORS * 512, GFP_KERNEL)) == NULL) {
1755 printk("no mem for ");
1756 unit[drive].type = &drive_types[num_dr_types - 1]; /* FD_NODRIVE */
1757 drives--;
1758 nomem = 1;
1759 }
1760 printk("fd%d ",drive);
1761 }
1762 }
1763 if ((drives > 0) || (nomem == 0)) {
1764 if (drives == 0)
1765 printk("no drives");
1766 printk("\n");
1767 return drives;
1768 }
1769 printk("\n");
1770 return -ENOMEM;
1771 }
1772
amiga_floppy_init(void)1773 int __init amiga_floppy_init(void)
1774 {
1775 int i;
1776
1777 if (!AMIGAHW_PRESENT(AMI_FLOPPY))
1778 return -ENXIO;
1779
1780 if (register_blkdev(MAJOR_NR,"fd",&floppy_fops)) {
1781 printk("fd: Unable to get major %d for floppy\n",MAJOR_NR);
1782 return -EBUSY;
1783 }
1784 /*
1785 * We request DSKPTR, DSKLEN and DSKDATA only, because the other
1786 * floppy registers are too spreaded over the custom register space
1787 */
1788 if (!request_mem_region(CUSTOM_PHYSADDR+0x20, 8, "amiflop [Paula]")) {
1789 printk("fd: cannot get floppy registers\n");
1790 unregister_blkdev(MAJOR_NR,"fd");
1791 return -EBUSY;
1792 }
1793 if ((raw_buf = (char *)amiga_chip_alloc (RAW_BUF_SIZE, "Floppy")) ==
1794 NULL) {
1795 printk("fd: cannot get chip mem buffer\n");
1796 release_mem_region(CUSTOM_PHYSADDR+0x20, 8);
1797 unregister_blkdev(MAJOR_NR,"fd");
1798 return -ENOMEM;
1799 }
1800 if (request_irq(IRQ_AMIGA_DSKBLK, fd_block_done, 0, "floppy_dma", NULL)) {
1801 printk("fd: cannot get irq for dma\n");
1802 amiga_chip_free(raw_buf);
1803 release_mem_region(CUSTOM_PHYSADDR+0x20, 8);
1804 unregister_blkdev(MAJOR_NR,"fd");
1805 return -EBUSY;
1806 }
1807 if (request_irq(IRQ_AMIGA_CIAA_TB, ms_isr, 0, "floppy_timer", NULL)) {
1808 printk("fd: cannot get irq for timer\n");
1809 free_irq(IRQ_AMIGA_DSKBLK, NULL);
1810 amiga_chip_free(raw_buf);
1811 release_mem_region(CUSTOM_PHYSADDR+0x20, 8);
1812 unregister_blkdev(MAJOR_NR,"fd");
1813 return -EBUSY;
1814 }
1815 if (fd_probe_drives() < 1) { /* No usable drives */
1816 free_irq(IRQ_AMIGA_CIAA_TB, NULL);
1817 free_irq(IRQ_AMIGA_DSKBLK, NULL);
1818 amiga_chip_free(raw_buf);
1819 release_mem_region(CUSTOM_PHYSADDR+0x20, 8);
1820 unregister_blkdev(MAJOR_NR,"fd");
1821 return -ENXIO;
1822 }
1823
1824 /* initialize variables */
1825 init_timer(&motor_on_timer);
1826 motor_on_timer.expires = 0;
1827 motor_on_timer.data = 0;
1828 motor_on_timer.function = motor_on_callback;
1829 for (i = 0; i < FD_MAX_UNITS; i++) {
1830 init_timer(&motor_off_timer[i]);
1831 motor_off_timer[i].expires = 0;
1832 motor_off_timer[i].data = i|0x80000000;
1833 motor_off_timer[i].function = fd_motor_off;
1834 init_timer(&flush_track_timer[i]);
1835 flush_track_timer[i].expires = 0;
1836 flush_track_timer[i].data = i;
1837 flush_track_timer[i].function = flush_track_callback;
1838
1839 unit[i].track = -1;
1840 }
1841
1842 init_timer(&post_write_timer);
1843 post_write_timer.expires = 0;
1844 post_write_timer.data = 0;
1845 post_write_timer.function = post_write;
1846
1847 blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
1848 blksize_size[MAJOR_NR] = floppy_blocksizes;
1849 blk_size[MAJOR_NR] = floppy_sizes;
1850
1851 for (i = 0; i < 128; i++)
1852 mfmdecode[i]=255;
1853 for (i = 0; i < 16; i++)
1854 mfmdecode[mfmencode[i]]=i;
1855
1856 /* make sure that disk DMA is enabled */
1857 custom.dmacon = DMAF_SETCLR | DMAF_DISK;
1858
1859 /* init ms timer */
1860 ciaa.crb = 8; /* one-shot, stop */
1861
1862 (void)do_floppy; /* avoid warning about unused variable */
1863 return 0;
1864 }
1865
1866 #ifdef MODULE
1867 #include <linux/version.h>
1868
init_module(void)1869 int init_module(void)
1870 {
1871 if (!MACH_IS_AMIGA)
1872 return -ENXIO;
1873 return amiga_floppy_init();
1874 }
1875
cleanup_module(void)1876 void cleanup_module(void)
1877 {
1878 int i;
1879
1880 for( i = 0; i < FD_MAX_UNITS; i++)
1881 if (unit[i].type->code != FD_NODRIVE)
1882 kfree(unit[i].trackbuf);
1883 free_irq(IRQ_AMIGA_CIAA_TB, NULL);
1884 free_irq(IRQ_AMIGA_DSKBLK, NULL);
1885 custom.dmacon = DMAF_DISK; /* disable DMA */
1886 amiga_chip_free(raw_buf);
1887 blk_size[MAJOR_NR] = NULL;
1888 blksize_size[MAJOR_NR] = NULL;
1889 blk_cleanup_queue(BLK_DEFAULT_QUEUE(MAJOR_NR));
1890 release_mem_region(CUSTOM_PHYSADDR+0x20, 8);
1891 unregister_blkdev(MAJOR_NR, "fd");
1892 }
1893 #endif
1894