ext4: Fix discard of inode prealloc space with delayed allocation.
[linux-2.6/mini2440.git] / drivers / block / amiflop.c
blob8df436ff7068b4840bdbcf610e357797ae387ae5
1 /*
2 * linux/amiga/amiflop.c
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)
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
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
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)
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.
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
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.
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 ;-)
56 #include <linux/module.h>
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 #include <linux/interrupt.h>
69 #include <asm/setup.h>
70 #include <asm/uaccess.h>
71 #include <asm/amigahw.h>
72 #include <asm/amigaints.h>
73 #include <asm/irq.h>
75 #undef DEBUG /* print _LOTS_ of infos */
77 #define RAW_IOCTL
78 #ifdef RAW_IOCTL
79 #define IOCTL_RAW_TRACK 0x5254524B /* 'RTRK' */
80 #endif
83 * Defines
87 * Error codes
89 #define FD_OK 0 /* operation succeeded */
90 #define FD_ERROR -1 /* general error (seek, read, write, etc) */
91 #define FD_NOUNIT 1 /* unit does not exist */
92 #define FD_UNITBUSY 2 /* unit already active */
93 #define FD_NOTACTIVE 3 /* unit is not active */
94 #define FD_NOTREADY 4 /* unit is not ready (motor not on/no disk) */
96 #define MFM_NOSYNC 1
97 #define MFM_HEADER 2
98 #define MFM_DATA 3
99 #define MFM_TRACK 4
102 * Floppy ID values
104 #define FD_NODRIVE 0x00000000 /* response when no unit is present */
105 #define FD_DD_3 0xffffffff /* double-density 3.5" (880K) drive */
106 #define FD_HD_3 0x55555555 /* high-density 3.5" (1760K) drive */
107 #define FD_DD_5 0xaaaaaaaa /* double-density 5.25" (440K) drive */
109 static unsigned long int fd_def_df0 = FD_DD_3; /* default for df0 if it doesn't identify */
111 module_param(fd_def_df0, ulong, 0);
112 MODULE_LICENSE("GPL");
114 static struct request_queue *floppy_queue;
115 #define QUEUE (floppy_queue)
116 #define CURRENT elv_next_request(floppy_queue)
119 * Macros
121 #define MOTOR_ON (ciab.prb &= ~DSKMOTOR)
122 #define MOTOR_OFF (ciab.prb |= DSKMOTOR)
123 #define SELECT(mask) (ciab.prb &= ~mask)
124 #define DESELECT(mask) (ciab.prb |= mask)
125 #define SELMASK(drive) (1 << (3 + (drive & 3)))
127 static struct fd_drive_type drive_types[] = {
128 /* code name tr he rdsz wrsz sm pc1 pc2 sd st st*/
129 /* warning: times are now in milliseconds (ms) */
130 { FD_DD_3, "DD 3.5", 80, 2, 14716, 13630, 1, 80,161, 3, 18, 1},
131 { FD_HD_3, "HD 3.5", 80, 2, 28344, 27258, 2, 80,161, 3, 18, 1},
132 { FD_DD_5, "DD 5.25", 40, 2, 14716, 13630, 1, 40, 81, 6, 30, 2},
133 { FD_NODRIVE, "No Drive", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
135 static int num_dr_types = ARRAY_SIZE(drive_types);
137 static int amiga_read(int), dos_read(int);
138 static void amiga_write(int), dos_write(int);
139 static struct fd_data_type data_types[] = {
140 { "Amiga", 11 , amiga_read, amiga_write},
141 { "MS-Dos", 9, dos_read, dos_write}
144 /* current info on each unit */
145 static struct amiga_floppy_struct unit[FD_MAX_UNITS];
147 static struct timer_list flush_track_timer[FD_MAX_UNITS];
148 static struct timer_list post_write_timer;
149 static struct timer_list motor_on_timer;
150 static struct timer_list motor_off_timer[FD_MAX_UNITS];
151 static int on_attempts;
153 /* Synchronization of FDC access */
154 /* request loop (trackbuffer) */
155 static volatile int fdc_busy = -1;
156 static volatile int fdc_nested;
157 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
159 static DECLARE_COMPLETION(motor_on_completion);
161 static volatile int selected = -1; /* currently selected drive */
163 static int writepending;
164 static int writefromint;
165 static char *raw_buf;
167 static DEFINE_SPINLOCK(amiflop_lock);
169 #define RAW_BUF_SIZE 30000 /* size of raw disk data */
172 * These are global variables, as that's the easiest way to give
173 * information to interrupts. They are the data used for the current
174 * request.
176 static volatile char block_flag;
177 static DECLARE_WAIT_QUEUE_HEAD(wait_fd_block);
179 /* MS-Dos MFM Coding tables (should go quick and easy) */
180 static unsigned char mfmencode[16]={
181 0x2a, 0x29, 0x24, 0x25, 0x12, 0x11, 0x14, 0x15,
182 0x4a, 0x49, 0x44, 0x45, 0x52, 0x51, 0x54, 0x55
184 static unsigned char mfmdecode[128];
186 /* floppy internal millisecond timer stuff */
187 static DECLARE_COMPLETION(ms_wait_completion);
188 #define MS_TICKS ((amiga_eclock+50)/1000)
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.
195 #define MAX_ERRORS 12
197 #define custom amiga_custom
199 /* Prevent "aliased" accesses. */
200 static int fd_ref[4] = { 0,0,0,0 };
201 static int fd_device[4] = { 0, 0, 0, 0 };
204 * Here come the actual hardware access and helper functions.
205 * They are not reentrant and single threaded because all drives
206 * share the same hardware and the same trackbuffer.
209 /* Milliseconds timer */
211 static irqreturn_t ms_isr(int irq, void *dummy)
213 complete(&ms_wait_completion);
214 return IRQ_HANDLED;
217 /* all waits are queued up
218 A more generic routine would do a schedule a la timer.device */
219 static void ms_delay(int ms)
221 int ticks;
222 static DEFINE_MUTEX(mutex);
224 if (ms > 0) {
225 mutex_lock(&mutex);
226 ticks = MS_TICKS*ms-1;
227 ciaa.tblo=ticks%256;
228 ciaa.tbhi=ticks/256;
229 ciaa.crb=0x19; /*count eclock, force load, one-shoot, start */
230 wait_for_completion(&ms_wait_completion);
231 mutex_unlock(&mutex);
235 /* Hardware semaphore */
237 /* returns true when we would get the semaphore */
238 static inline int try_fdc(int drive)
240 drive &= 3;
241 return ((fdc_busy < 0) || (fdc_busy == drive));
244 static void get_fdc(int drive)
246 unsigned long flags;
248 drive &= 3;
249 #ifdef DEBUG
250 printk("get_fdc: drive %d fdc_busy %d fdc_nested %d\n",drive,fdc_busy,fdc_nested);
251 #endif
252 local_irq_save(flags);
253 wait_event(fdc_wait, try_fdc(drive));
254 fdc_busy = drive;
255 fdc_nested++;
256 local_irq_restore(flags);
259 static inline void rel_fdc(void)
261 #ifdef DEBUG
262 if (fdc_nested == 0)
263 printk("fd: unmatched rel_fdc\n");
264 printk("rel_fdc: fdc_busy %d fdc_nested %d\n",fdc_busy,fdc_nested);
265 #endif
266 fdc_nested--;
267 if (fdc_nested == 0) {
268 fdc_busy = -1;
269 wake_up(&fdc_wait);
273 static void fd_select (int drive)
275 unsigned char prb = ~0;
277 drive&=3;
278 #ifdef DEBUG
279 printk("selecting %d\n",drive);
280 #endif
281 if (drive == selected)
282 return;
283 get_fdc(drive);
284 selected = drive;
286 if (unit[drive].track % 2 != 0)
287 prb &= ~DSKSIDE;
288 if (unit[drive].motor == 1)
289 prb &= ~DSKMOTOR;
290 ciab.prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
291 ciab.prb = prb;
292 prb &= ~SELMASK(drive);
293 ciab.prb = prb;
294 rel_fdc();
297 static void fd_deselect (int drive)
299 unsigned char prb;
300 unsigned long flags;
302 drive&=3;
303 #ifdef DEBUG
304 printk("deselecting %d\n",drive);
305 #endif
306 if (drive != selected) {
307 printk(KERN_WARNING "Deselecting drive %d while %d was selected!\n",drive,selected);
308 return;
311 get_fdc(drive);
312 local_irq_save(flags);
314 selected = -1;
316 prb = ciab.prb;
317 prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
318 ciab.prb = prb;
320 local_irq_restore (flags);
321 rel_fdc();
325 static void motor_on_callback(unsigned long nr)
327 if (!(ciaa.pra & DSKRDY) || --on_attempts == 0) {
328 complete_all(&motor_on_completion);
329 } else {
330 motor_on_timer.expires = jiffies + HZ/10;
331 add_timer(&motor_on_timer);
335 static int fd_motor_on(int nr)
337 nr &= 3;
339 del_timer(motor_off_timer + nr);
341 if (!unit[nr].motor) {
342 unit[nr].motor = 1;
343 fd_select(nr);
345 INIT_COMPLETION(motor_on_completion);
346 motor_on_timer.data = nr;
347 mod_timer(&motor_on_timer, jiffies + HZ/2);
349 on_attempts = 10;
350 wait_for_completion(&motor_on_completion);
351 fd_deselect(nr);
354 if (on_attempts == 0) {
355 on_attempts = -1;
356 #if 0
357 printk (KERN_ERR "motor_on failed, turning motor off\n");
358 fd_motor_off (nr);
359 return 0;
360 #else
361 printk (KERN_WARNING "DSKRDY not set after 1.5 seconds - assuming drive is spinning notwithstanding\n");
362 #endif
365 return 1;
368 static void fd_motor_off(unsigned long drive)
370 long calledfromint;
371 #ifdef MODULE
372 long decusecount;
374 decusecount = drive & 0x40000000;
375 #endif
376 calledfromint = drive & 0x80000000;
377 drive&=3;
378 if (calledfromint && !try_fdc(drive)) {
379 /* We would be blocked in an interrupt, so try again later */
380 motor_off_timer[drive].expires = jiffies + 1;
381 add_timer(motor_off_timer + drive);
382 return;
384 unit[drive].motor = 0;
385 fd_select(drive);
386 udelay (1);
387 fd_deselect(drive);
390 static void floppy_off (unsigned int nr)
392 int drive;
394 drive = nr & 3;
395 /* called this way it is always from interrupt */
396 motor_off_timer[drive].data = nr | 0x80000000;
397 mod_timer(motor_off_timer + drive, jiffies + 3*HZ);
400 static int fd_calibrate(int drive)
402 unsigned char prb;
403 int n;
405 drive &= 3;
406 get_fdc(drive);
407 if (!fd_motor_on (drive))
408 return 0;
409 fd_select (drive);
410 prb = ciab.prb;
411 prb |= DSKSIDE;
412 prb &= ~DSKDIREC;
413 ciab.prb = prb;
414 for (n = unit[drive].type->tracks/2; n != 0; --n) {
415 if (ciaa.pra & DSKTRACK0)
416 break;
417 prb &= ~DSKSTEP;
418 ciab.prb = prb;
419 prb |= DSKSTEP;
420 udelay (2);
421 ciab.prb = prb;
422 ms_delay(unit[drive].type->step_delay);
424 ms_delay (unit[drive].type->settle_time);
425 prb |= DSKDIREC;
426 n = unit[drive].type->tracks + 20;
427 for (;;) {
428 prb &= ~DSKSTEP;
429 ciab.prb = prb;
430 prb |= DSKSTEP;
431 udelay (2);
432 ciab.prb = prb;
433 ms_delay(unit[drive].type->step_delay + 1);
434 if ((ciaa.pra & DSKTRACK0) == 0)
435 break;
436 if (--n == 0) {
437 printk (KERN_ERR "fd%d: calibrate failed, turning motor off\n", drive);
438 fd_motor_off (drive);
439 unit[drive].track = -1;
440 rel_fdc();
441 return 0;
444 unit[drive].track = 0;
445 ms_delay(unit[drive].type->settle_time);
447 rel_fdc();
448 fd_deselect(drive);
449 return 1;
452 static int fd_seek(int drive, int track)
454 unsigned char prb;
455 int cnt;
457 #ifdef DEBUG
458 printk("seeking drive %d to track %d\n",drive,track);
459 #endif
460 drive &= 3;
461 get_fdc(drive);
462 if (unit[drive].track == track) {
463 rel_fdc();
464 return 1;
466 if (!fd_motor_on(drive)) {
467 rel_fdc();
468 return 0;
470 if (unit[drive].track < 0 && !fd_calibrate(drive)) {
471 rel_fdc();
472 return 0;
475 fd_select (drive);
476 cnt = unit[drive].track/2 - track/2;
477 prb = ciab.prb;
478 prb |= DSKSIDE | DSKDIREC;
479 if (track % 2 != 0)
480 prb &= ~DSKSIDE;
481 if (cnt < 0) {
482 cnt = - cnt;
483 prb &= ~DSKDIREC;
485 ciab.prb = prb;
486 if (track % 2 != unit[drive].track % 2)
487 ms_delay (unit[drive].type->side_time);
488 unit[drive].track = track;
489 if (cnt == 0) {
490 rel_fdc();
491 fd_deselect(drive);
492 return 1;
494 do {
495 prb &= ~DSKSTEP;
496 ciab.prb = prb;
497 prb |= DSKSTEP;
498 udelay (1);
499 ciab.prb = prb;
500 ms_delay (unit[drive].type->step_delay);
501 } while (--cnt != 0);
502 ms_delay (unit[drive].type->settle_time);
504 rel_fdc();
505 fd_deselect(drive);
506 return 1;
509 static unsigned long fd_get_drive_id(int drive)
511 int i;
512 ulong id = 0;
514 drive&=3;
515 get_fdc(drive);
516 /* set up for ID */
517 MOTOR_ON;
518 udelay(2);
519 SELECT(SELMASK(drive));
520 udelay(2);
521 DESELECT(SELMASK(drive));
522 udelay(2);
523 MOTOR_OFF;
524 udelay(2);
525 SELECT(SELMASK(drive));
526 udelay(2);
527 DESELECT(SELMASK(drive));
528 udelay(2);
530 /* loop and read disk ID */
531 for (i=0; i<32; i++) {
532 SELECT(SELMASK(drive));
533 udelay(2);
535 /* read and store value of DSKRDY */
536 id <<= 1;
537 id |= (ciaa.pra & DSKRDY) ? 0 : 1; /* cia regs are low-active! */
539 DESELECT(SELMASK(drive));
542 rel_fdc();
545 * RB: At least A500/A2000's df0: don't identify themselves.
546 * As every (real) Amiga has at least a 3.5" DD drive as df0:
547 * we default to that if df0: doesn't identify as a certain
548 * type.
550 if(drive == 0 && id == FD_NODRIVE)
552 id = fd_def_df0;
553 printk(KERN_NOTICE "fd: drive 0 didn't identify, setting default %08lx\n", (ulong)fd_def_df0);
555 /* return the ID value */
556 return (id);
559 static irqreturn_t fd_block_done(int irq, void *dummy)
561 if (block_flag)
562 custom.dsklen = 0x4000;
564 if (block_flag == 2) { /* writing */
565 writepending = 2;
566 post_write_timer.expires = jiffies + 1; /* at least 2 ms */
567 post_write_timer.data = selected;
568 add_timer(&post_write_timer);
570 else { /* reading */
571 block_flag = 0;
572 wake_up (&wait_fd_block);
574 return IRQ_HANDLED;
577 static void raw_read(int drive)
579 drive&=3;
580 get_fdc(drive);
581 wait_event(wait_fd_block, !block_flag);
582 fd_select(drive);
583 /* setup adkcon bits correctly */
584 custom.adkcon = ADK_MSBSYNC;
585 custom.adkcon = ADK_SETCLR|ADK_WORDSYNC|ADK_FAST;
587 custom.dsksync = MFM_SYNC;
589 custom.dsklen = 0;
590 custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf);
591 custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN;
592 custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN;
594 block_flag = 1;
596 wait_event(wait_fd_block, !block_flag);
598 custom.dsklen = 0;
599 fd_deselect(drive);
600 rel_fdc();
603 static int raw_write(int drive)
605 ushort adk;
607 drive&=3;
608 get_fdc(drive); /* corresponds to rel_fdc() in post_write() */
609 if ((ciaa.pra & DSKPROT) == 0) {
610 rel_fdc();
611 return 0;
613 wait_event(wait_fd_block, !block_flag);
614 fd_select(drive);
615 /* clear adkcon bits */
616 custom.adkcon = ADK_PRECOMP1|ADK_PRECOMP0|ADK_WORDSYNC|ADK_MSBSYNC;
617 /* set appropriate adkcon bits */
618 adk = ADK_SETCLR|ADK_FAST;
619 if ((ulong)unit[drive].track >= unit[drive].type->precomp2)
620 adk |= ADK_PRECOMP1;
621 else if ((ulong)unit[drive].track >= unit[drive].type->precomp1)
622 adk |= ADK_PRECOMP0;
623 custom.adkcon = adk;
625 custom.dsklen = DSKLEN_WRITE;
626 custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf);
627 custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE;
628 custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE;
630 block_flag = 2;
631 return 1;
635 * to be called at least 2ms after the write has finished but before any
636 * other access to the hardware.
638 static void post_write (unsigned long drive)
640 #ifdef DEBUG
641 printk("post_write for drive %ld\n",drive);
642 #endif
643 drive &= 3;
644 custom.dsklen = 0;
645 block_flag = 0;
646 writepending = 0;
647 writefromint = 0;
648 unit[drive].dirty = 0;
649 wake_up(&wait_fd_block);
650 fd_deselect(drive);
651 rel_fdc(); /* corresponds to get_fdc() in raw_write */
656 * The following functions are to convert the block contents into raw data
657 * written to disk and vice versa.
658 * (Add other formats here ;-))
661 static unsigned long scan_sync(unsigned long raw, unsigned long end)
663 ushort *ptr = (ushort *)raw, *endp = (ushort *)end;
665 while (ptr < endp && *ptr++ != 0x4489)
667 if (ptr < endp) {
668 while (*ptr == 0x4489 && ptr < endp)
669 ptr++;
670 return (ulong)ptr;
672 return 0;
675 static inline unsigned long checksum(unsigned long *addr, int len)
677 unsigned long csum = 0;
679 len /= sizeof(*addr);
680 while (len-- > 0)
681 csum ^= *addr++;
682 csum = ((csum>>1) & 0x55555555) ^ (csum & 0x55555555);
684 return csum;
687 static unsigned long decode (unsigned long *data, unsigned long *raw,
688 int len)
690 ulong *odd, *even;
692 /* convert length from bytes to longwords */
693 len >>= 2;
694 odd = raw;
695 even = odd + len;
697 /* prepare return pointer */
698 raw += len * 2;
700 do {
701 *data++ = ((*odd++ & 0x55555555) << 1) | (*even++ & 0x55555555);
702 } while (--len != 0);
704 return (ulong)raw;
707 struct header {
708 unsigned char magic;
709 unsigned char track;
710 unsigned char sect;
711 unsigned char ord;
712 unsigned char labels[16];
713 unsigned long hdrchk;
714 unsigned long datachk;
717 static int amiga_read(int drive)
719 unsigned long raw;
720 unsigned long end;
721 int scnt;
722 unsigned long csum;
723 struct header hdr;
725 drive&=3;
726 raw = (long) raw_buf;
727 end = raw + unit[drive].type->read_size;
729 for (scnt = 0;scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) {
730 if (!(raw = scan_sync(raw, end))) {
731 printk (KERN_INFO "can't find sync for sector %d\n", scnt);
732 return MFM_NOSYNC;
735 raw = decode ((ulong *)&hdr.magic, (ulong *)raw, 4);
736 raw = decode ((ulong *)&hdr.labels, (ulong *)raw, 16);
737 raw = decode ((ulong *)&hdr.hdrchk, (ulong *)raw, 4);
738 raw = decode ((ulong *)&hdr.datachk, (ulong *)raw, 4);
739 csum = checksum((ulong *)&hdr,
740 (char *)&hdr.hdrchk-(char *)&hdr);
742 #ifdef DEBUG
743 printk ("(%x,%d,%d,%d) (%lx,%lx,%lx,%lx) %lx %lx\n",
744 hdr.magic, hdr.track, hdr.sect, hdr.ord,
745 *(ulong *)&hdr.labels[0], *(ulong *)&hdr.labels[4],
746 *(ulong *)&hdr.labels[8], *(ulong *)&hdr.labels[12],
747 hdr.hdrchk, hdr.datachk);
748 #endif
750 if (hdr.hdrchk != csum) {
751 printk(KERN_INFO "MFM_HEADER: %08lx,%08lx\n", hdr.hdrchk, csum);
752 return MFM_HEADER;
755 /* verify track */
756 if (hdr.track != unit[drive].track) {
757 printk(KERN_INFO "MFM_TRACK: %d, %d\n", hdr.track, unit[drive].track);
758 return MFM_TRACK;
761 raw = decode ((ulong *)(unit[drive].trackbuf + hdr.sect*512),
762 (ulong *)raw, 512);
763 csum = checksum((ulong *)(unit[drive].trackbuf + hdr.sect*512), 512);
765 if (hdr.datachk != csum) {
766 printk(KERN_INFO "MFM_DATA: (%x:%d:%d:%d) sc=%d %lx, %lx\n",
767 hdr.magic, hdr.track, hdr.sect, hdr.ord, scnt,
768 hdr.datachk, csum);
769 printk (KERN_INFO "data=(%lx,%lx,%lx,%lx)\n",
770 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[0],
771 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[1],
772 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[2],
773 ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[3]);
774 return MFM_DATA;
778 return 0;
781 static void encode(unsigned long data, unsigned long *dest)
783 unsigned long data2;
785 data &= 0x55555555;
786 data2 = data ^ 0x55555555;
787 data |= ((data2 >> 1) | 0x80000000) & (data2 << 1);
789 if (*(dest - 1) & 0x00000001)
790 data &= 0x7FFFFFFF;
792 *dest = data;
795 static void encode_block(unsigned long *dest, unsigned long *src, int len)
797 int cnt, to_cnt = 0;
798 unsigned long data;
800 /* odd bits */
801 for (cnt = 0; cnt < len / 4; cnt++) {
802 data = src[cnt] >> 1;
803 encode(data, dest + to_cnt++);
806 /* even bits */
807 for (cnt = 0; cnt < len / 4; cnt++) {
808 data = src[cnt];
809 encode(data, dest + to_cnt++);
813 static unsigned long *putsec(int disk, unsigned long *raw, int cnt)
815 struct header hdr;
816 int i;
818 disk&=3;
819 *raw = (raw[-1]&1) ? 0x2AAAAAAA : 0xAAAAAAAA;
820 raw++;
821 *raw++ = 0x44894489;
823 hdr.magic = 0xFF;
824 hdr.track = unit[disk].track;
825 hdr.sect = cnt;
826 hdr.ord = unit[disk].dtype->sects * unit[disk].type->sect_mult - cnt;
827 for (i = 0; i < 16; i++)
828 hdr.labels[i] = 0;
829 hdr.hdrchk = checksum((ulong *)&hdr,
830 (char *)&hdr.hdrchk-(char *)&hdr);
831 hdr.datachk = checksum((ulong *)(unit[disk].trackbuf+cnt*512), 512);
833 encode_block(raw, (ulong *)&hdr.magic, 4);
834 raw += 2;
835 encode_block(raw, (ulong *)&hdr.labels, 16);
836 raw += 8;
837 encode_block(raw, (ulong *)&hdr.hdrchk, 4);
838 raw += 2;
839 encode_block(raw, (ulong *)&hdr.datachk, 4);
840 raw += 2;
841 encode_block(raw, (ulong *)(unit[disk].trackbuf+cnt*512), 512);
842 raw += 256;
844 return raw;
847 static void amiga_write(int disk)
849 unsigned int cnt;
850 unsigned long *ptr = (unsigned long *)raw_buf;
852 disk&=3;
853 /* gap space */
854 for (cnt = 0; cnt < 415 * unit[disk].type->sect_mult; cnt++)
855 *ptr++ = 0xaaaaaaaa;
857 /* sectors */
858 for (cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++)
859 ptr = putsec (disk, ptr, cnt);
860 *(ushort *)ptr = (ptr[-1]&1) ? 0x2AA8 : 0xAAA8;
864 struct dos_header {
865 unsigned char track, /* 0-80 */
866 side, /* 0-1 */
867 sec, /* 0-...*/
868 len_desc;/* 2 */
869 unsigned short crc; /* on 68000 we got an alignment problem,
870 but this compiler solves it by adding silently
871 adding a pad byte so data won't fit
872 and this took about 3h to discover.... */
873 unsigned char gap1[22]; /* for longword-alignedness (0x4e) */
876 /* crc routines are borrowed from the messydos-handler */
878 /* excerpt from the messydos-device
879 ; The CRC is computed not only over the actual data, but including
880 ; the SYNC mark (3 * $a1) and the 'ID/DATA - Address Mark' ($fe/$fb).
881 ; As we don't read or encode these fields into our buffers, we have to
882 ; preload the registers containing the CRC with the values they would have
883 ; after stepping over these fields.
885 ; How CRCs "really" work:
887 ; First, you should regard a bitstring as a series of coefficients of
888 ; polynomials. We calculate with these polynomials in modulo-2
889 ; arithmetic, in which both add and subtract are done the same as
890 ; exclusive-or. Now, we modify our data (a very long polynomial) in
891 ; such a way that it becomes divisible by the CCITT-standard 16-bit
892 ; 16 12 5
893 ; polynomial: x + x + x + 1, represented by $11021. The easiest
894 ; way to do this would be to multiply (using proper arithmetic) our
895 ; datablock with $11021. So we have:
896 ; data * $11021 =
897 ; data * ($10000 + $1021) =
898 ; data * $10000 + data * $1021
899 ; The left part of this is simple: Just add two 0 bytes. But then
900 ; the right part (data $1021) remains difficult and even could have
901 ; a carry into the left part. The solution is to use a modified
902 ; multiplication, which has a result that is not correct, but with
903 ; a difference of any multiple of $11021. We then only need to keep
904 ; the 16 least significant bits of the result.
906 ; The following algorithm does this for us:
908 ; unsigned char *data, c, crclo, crchi;
909 ; while (not done) {
910 ; c = *data++ + crchi;
911 ; crchi = (@ c) >> 8 + crclo;
912 ; crclo = @ c;
915 ; Remember, + is done with EOR, the @ operator is in two tables (high
916 ; and low byte separately), which is calculated as
918 ; $1021 * (c & $F0)
919 ; xor $1021 * (c & $0F)
920 ; xor $1021 * (c >> 4) (* is regular multiplication)
923 ; Anyway, the end result is the same as the remainder of the division of
924 ; the data by $11021. I am afraid I need to study theory a bit more...
927 my only works was to code this from manx to C....
931 static ushort dos_crc(void * data_a3, int data_d0, int data_d1, int data_d3)
933 static unsigned char CRCTable1[] = {
934 0x00,0x10,0x20,0x30,0x40,0x50,0x60,0x70,0x81,0x91,0xa1,0xb1,0xc1,0xd1,0xe1,0xf1,
935 0x12,0x02,0x32,0x22,0x52,0x42,0x72,0x62,0x93,0x83,0xb3,0xa3,0xd3,0xc3,0xf3,0xe3,
936 0x24,0x34,0x04,0x14,0x64,0x74,0x44,0x54,0xa5,0xb5,0x85,0x95,0xe5,0xf5,0xc5,0xd5,
937 0x36,0x26,0x16,0x06,0x76,0x66,0x56,0x46,0xb7,0xa7,0x97,0x87,0xf7,0xe7,0xd7,0xc7,
938 0x48,0x58,0x68,0x78,0x08,0x18,0x28,0x38,0xc9,0xd9,0xe9,0xf9,0x89,0x99,0xa9,0xb9,
939 0x5a,0x4a,0x7a,0x6a,0x1a,0x0a,0x3a,0x2a,0xdb,0xcb,0xfb,0xeb,0x9b,0x8b,0xbb,0xab,
940 0x6c,0x7c,0x4c,0x5c,0x2c,0x3c,0x0c,0x1c,0xed,0xfd,0xcd,0xdd,0xad,0xbd,0x8d,0x9d,
941 0x7e,0x6e,0x5e,0x4e,0x3e,0x2e,0x1e,0x0e,0xff,0xef,0xdf,0xcf,0xbf,0xaf,0x9f,0x8f,
942 0x91,0x81,0xb1,0xa1,0xd1,0xc1,0xf1,0xe1,0x10,0x00,0x30,0x20,0x50,0x40,0x70,0x60,
943 0x83,0x93,0xa3,0xb3,0xc3,0xd3,0xe3,0xf3,0x02,0x12,0x22,0x32,0x42,0x52,0x62,0x72,
944 0xb5,0xa5,0x95,0x85,0xf5,0xe5,0xd5,0xc5,0x34,0x24,0x14,0x04,0x74,0x64,0x54,0x44,
945 0xa7,0xb7,0x87,0x97,0xe7,0xf7,0xc7,0xd7,0x26,0x36,0x06,0x16,0x66,0x76,0x46,0x56,
946 0xd9,0xc9,0xf9,0xe9,0x99,0x89,0xb9,0xa9,0x58,0x48,0x78,0x68,0x18,0x08,0x38,0x28,
947 0xcb,0xdb,0xeb,0xfb,0x8b,0x9b,0xab,0xbb,0x4a,0x5a,0x6a,0x7a,0x0a,0x1a,0x2a,0x3a,
948 0xfd,0xed,0xdd,0xcd,0xbd,0xad,0x9d,0x8d,0x7c,0x6c,0x5c,0x4c,0x3c,0x2c,0x1c,0x0c,
949 0xef,0xff,0xcf,0xdf,0xaf,0xbf,0x8f,0x9f,0x6e,0x7e,0x4e,0x5e,0x2e,0x3e,0x0e,0x1e
952 static unsigned char CRCTable2[] = {
953 0x00,0x21,0x42,0x63,0x84,0xa5,0xc6,0xe7,0x08,0x29,0x4a,0x6b,0x8c,0xad,0xce,0xef,
954 0x31,0x10,0x73,0x52,0xb5,0x94,0xf7,0xd6,0x39,0x18,0x7b,0x5a,0xbd,0x9c,0xff,0xde,
955 0x62,0x43,0x20,0x01,0xe6,0xc7,0xa4,0x85,0x6a,0x4b,0x28,0x09,0xee,0xcf,0xac,0x8d,
956 0x53,0x72,0x11,0x30,0xd7,0xf6,0x95,0xb4,0x5b,0x7a,0x19,0x38,0xdf,0xfe,0x9d,0xbc,
957 0xc4,0xe5,0x86,0xa7,0x40,0x61,0x02,0x23,0xcc,0xed,0x8e,0xaf,0x48,0x69,0x0a,0x2b,
958 0xf5,0xd4,0xb7,0x96,0x71,0x50,0x33,0x12,0xfd,0xdc,0xbf,0x9e,0x79,0x58,0x3b,0x1a,
959 0xa6,0x87,0xe4,0xc5,0x22,0x03,0x60,0x41,0xae,0x8f,0xec,0xcd,0x2a,0x0b,0x68,0x49,
960 0x97,0xb6,0xd5,0xf4,0x13,0x32,0x51,0x70,0x9f,0xbe,0xdd,0xfc,0x1b,0x3a,0x59,0x78,
961 0x88,0xa9,0xca,0xeb,0x0c,0x2d,0x4e,0x6f,0x80,0xa1,0xc2,0xe3,0x04,0x25,0x46,0x67,
962 0xb9,0x98,0xfb,0xda,0x3d,0x1c,0x7f,0x5e,0xb1,0x90,0xf3,0xd2,0x35,0x14,0x77,0x56,
963 0xea,0xcb,0xa8,0x89,0x6e,0x4f,0x2c,0x0d,0xe2,0xc3,0xa0,0x81,0x66,0x47,0x24,0x05,
964 0xdb,0xfa,0x99,0xb8,0x5f,0x7e,0x1d,0x3c,0xd3,0xf2,0x91,0xb0,0x57,0x76,0x15,0x34,
965 0x4c,0x6d,0x0e,0x2f,0xc8,0xe9,0x8a,0xab,0x44,0x65,0x06,0x27,0xc0,0xe1,0x82,0xa3,
966 0x7d,0x5c,0x3f,0x1e,0xf9,0xd8,0xbb,0x9a,0x75,0x54,0x37,0x16,0xf1,0xd0,0xb3,0x92,
967 0x2e,0x0f,0x6c,0x4d,0xaa,0x8b,0xe8,0xc9,0x26,0x07,0x64,0x45,0xa2,0x83,0xe0,0xc1,
968 0x1f,0x3e,0x5d,0x7c,0x9b,0xba,0xd9,0xf8,0x17,0x36,0x55,0x74,0x93,0xb2,0xd1,0xf0
971 /* look at the asm-code - what looks in C a bit strange is almost as good as handmade */
972 register int i;
973 register unsigned char *CRCT1, *CRCT2, *data, c, crch, crcl;
975 CRCT1=CRCTable1;
976 CRCT2=CRCTable2;
977 data=data_a3;
978 crcl=data_d1;
979 crch=data_d0;
980 for (i=data_d3; i>=0; i--) {
981 c = (*data++) ^ crch;
982 crch = CRCT1[c] ^ crcl;
983 crcl = CRCT2[c];
985 return (crch<<8)|crcl;
988 static inline ushort dos_hdr_crc (struct dos_header *hdr)
990 return dos_crc(&(hdr->track), 0xb2, 0x30, 3); /* precomputed magic */
993 static inline ushort dos_data_crc(unsigned char *data)
995 return dos_crc(data, 0xe2, 0x95 ,511); /* precomputed magic */
998 static inline unsigned char dos_decode_byte(ushort word)
1000 register ushort w2;
1001 register unsigned char byte;
1002 register unsigned char *dec = mfmdecode;
1004 w2=word;
1005 w2>>=8;
1006 w2&=127;
1007 byte = dec[w2];
1008 byte <<= 4;
1009 w2 = word & 127;
1010 byte |= dec[w2];
1011 return byte;
1014 static unsigned long dos_decode(unsigned char *data, unsigned short *raw, int len)
1016 int i;
1018 for (i = 0; i < len; i++)
1019 *data++=dos_decode_byte(*raw++);
1020 return ((ulong)raw);
1023 #ifdef DEBUG
1024 static void dbg(unsigned long ptr)
1026 printk("raw data @%08lx: %08lx, %08lx ,%08lx, %08lx\n", ptr,
1027 ((ulong *)ptr)[0], ((ulong *)ptr)[1],
1028 ((ulong *)ptr)[2], ((ulong *)ptr)[3]);
1030 #endif
1032 static int dos_read(int drive)
1034 unsigned long end;
1035 unsigned long raw;
1036 int scnt;
1037 unsigned short crc,data_crc[2];
1038 struct dos_header hdr;
1040 drive&=3;
1041 raw = (long) raw_buf;
1042 end = raw + unit[drive].type->read_size;
1044 for (scnt=0; scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) {
1045 do { /* search for the right sync of each sec-hdr */
1046 if (!(raw = scan_sync (raw, end))) {
1047 printk(KERN_INFO "dos_read: no hdr sync on "
1048 "track %d, unit %d for sector %d\n",
1049 unit[drive].track,drive,scnt);
1050 return MFM_NOSYNC;
1052 #ifdef DEBUG
1053 dbg(raw);
1054 #endif
1055 } while (*((ushort *)raw)!=0x5554); /* loop usually only once done */
1056 raw+=2; /* skip over headermark */
1057 raw = dos_decode((unsigned char *)&hdr,(ushort *) raw,8);
1058 crc = dos_hdr_crc(&hdr);
1060 #ifdef DEBUG
1061 printk("(%3d,%d,%2d,%d) %x\n", hdr.track, hdr.side,
1062 hdr.sec, hdr.len_desc, hdr.crc);
1063 #endif
1065 if (crc != hdr.crc) {
1066 printk(KERN_INFO "dos_read: MFM_HEADER %04x,%04x\n",
1067 hdr.crc, crc);
1068 return MFM_HEADER;
1070 if (hdr.track != unit[drive].track/unit[drive].type->heads) {
1071 printk(KERN_INFO "dos_read: MFM_TRACK %d, %d\n",
1072 hdr.track,
1073 unit[drive].track/unit[drive].type->heads);
1074 return MFM_TRACK;
1077 if (hdr.side != unit[drive].track%unit[drive].type->heads) {
1078 printk(KERN_INFO "dos_read: MFM_SIDE %d, %d\n",
1079 hdr.side,
1080 unit[drive].track%unit[drive].type->heads);
1081 return MFM_TRACK;
1084 if (hdr.len_desc != 2) {
1085 printk(KERN_INFO "dos_read: unknown sector len "
1086 "descriptor %d\n", hdr.len_desc);
1087 return MFM_DATA;
1089 #ifdef DEBUG
1090 printk("hdr accepted\n");
1091 #endif
1092 if (!(raw = scan_sync (raw, end))) {
1093 printk(KERN_INFO "dos_read: no data sync on track "
1094 "%d, unit %d for sector%d, disk sector %d\n",
1095 unit[drive].track, drive, scnt, hdr.sec);
1096 return MFM_NOSYNC;
1098 #ifdef DEBUG
1099 dbg(raw);
1100 #endif
1102 if (*((ushort *)raw)!=0x5545) {
1103 printk(KERN_INFO "dos_read: no data mark after "
1104 "sync (%d,%d,%d,%d) sc=%d\n",
1105 hdr.track,hdr.side,hdr.sec,hdr.len_desc,scnt);
1106 return MFM_NOSYNC;
1109 raw+=2; /* skip data mark (included in checksum) */
1110 raw = dos_decode((unsigned char *)(unit[drive].trackbuf + (hdr.sec - 1) * 512), (ushort *) raw, 512);
1111 raw = dos_decode((unsigned char *)data_crc,(ushort *) raw,4);
1112 crc = dos_data_crc(unit[drive].trackbuf + (hdr.sec - 1) * 512);
1114 if (crc != data_crc[0]) {
1115 printk(KERN_INFO "dos_read: MFM_DATA (%d,%d,%d,%d) "
1116 "sc=%d, %x %x\n", hdr.track, hdr.side,
1117 hdr.sec, hdr.len_desc, scnt,data_crc[0], crc);
1118 printk(KERN_INFO "data=(%lx,%lx,%lx,%lx,...)\n",
1119 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[0],
1120 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[1],
1121 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[2],
1122 ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[3]);
1123 return MFM_DATA;
1126 return 0;
1129 static inline ushort dos_encode_byte(unsigned char byte)
1131 register unsigned char *enc, b2, b1;
1132 register ushort word;
1134 enc=mfmencode;
1135 b1=byte;
1136 b2=b1>>4;
1137 b1&=15;
1138 word=enc[b2] <<8 | enc [b1];
1139 return (word|((word&(256|64)) ? 0: 128));
1142 static void dos_encode_block(ushort *dest, unsigned char *src, int len)
1144 int i;
1146 for (i = 0; i < len; i++) {
1147 *dest=dos_encode_byte(*src++);
1148 *dest|=((dest[-1]&1)||(*dest&0x4000))? 0: 0x8000;
1149 dest++;
1153 static unsigned long *ms_putsec(int drive, unsigned long *raw, int cnt)
1155 static struct dos_header hdr={0,0,0,2,0,
1156 {78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78}};
1157 int i;
1158 static ushort crc[2]={0,0x4e4e};
1160 drive&=3;
1161 /* id gap 1 */
1162 /* the MFM word before is always 9254 */
1163 for(i=0;i<6;i++)
1164 *raw++=0xaaaaaaaa;
1165 /* 3 sync + 1 headermark */
1166 *raw++=0x44894489;
1167 *raw++=0x44895554;
1169 /* fill in the variable parts of the header */
1170 hdr.track=unit[drive].track/unit[drive].type->heads;
1171 hdr.side=unit[drive].track%unit[drive].type->heads;
1172 hdr.sec=cnt+1;
1173 hdr.crc=dos_hdr_crc(&hdr);
1175 /* header (without "magic") and id gap 2*/
1176 dos_encode_block((ushort *)raw,(unsigned char *) &hdr.track,28);
1177 raw+=14;
1179 /*id gap 3 */
1180 for(i=0;i<6;i++)
1181 *raw++=0xaaaaaaaa;
1183 /* 3 syncs and 1 datamark */
1184 *raw++=0x44894489;
1185 *raw++=0x44895545;
1187 /* data */
1188 dos_encode_block((ushort *)raw,
1189 (unsigned char *)unit[drive].trackbuf+cnt*512,512);
1190 raw+=256;
1192 /*data crc + jd's special gap (long words :-/) */
1193 crc[0]=dos_data_crc(unit[drive].trackbuf+cnt*512);
1194 dos_encode_block((ushort *) raw,(unsigned char *)crc,4);
1195 raw+=2;
1197 /* data gap */
1198 for(i=0;i<38;i++)
1199 *raw++=0x92549254;
1201 return raw; /* wrote 652 MFM words */
1204 static void dos_write(int disk)
1206 int cnt;
1207 unsigned long raw = (unsigned long) raw_buf;
1208 unsigned long *ptr=(unsigned long *)raw;
1210 disk&=3;
1211 /* really gap4 + indexgap , but we write it first and round it up */
1212 for (cnt=0;cnt<425;cnt++)
1213 *ptr++=0x92549254;
1215 /* the following is just guessed */
1216 if (unit[disk].type->sect_mult==2) /* check for HD-Disks */
1217 for(cnt=0;cnt<473;cnt++)
1218 *ptr++=0x92549254;
1220 /* now the index marks...*/
1221 for (cnt=0;cnt<20;cnt++)
1222 *ptr++=0x92549254;
1223 for (cnt=0;cnt<6;cnt++)
1224 *ptr++=0xaaaaaaaa;
1225 *ptr++=0x52245224;
1226 *ptr++=0x52245552;
1227 for (cnt=0;cnt<20;cnt++)
1228 *ptr++=0x92549254;
1230 /* sectors */
1231 for(cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++)
1232 ptr=ms_putsec(disk,ptr,cnt);
1234 *(ushort *)ptr = 0xaaa8; /* MFM word before is always 0x9254 */
1238 * Here comes the high level stuff (i.e. the filesystem interface)
1239 * and helper functions.
1240 * Normally this should be the only part that has to be adapted to
1241 * different kernel versions.
1244 /* FIXME: this assumes the drive is still spinning -
1245 * which is only true if we complete writing a track within three seconds
1247 static void flush_track_callback(unsigned long nr)
1249 nr&=3;
1250 writefromint = 1;
1251 if (!try_fdc(nr)) {
1252 /* we might block in an interrupt, so try again later */
1253 flush_track_timer[nr].expires = jiffies + 1;
1254 add_timer(flush_track_timer + nr);
1255 return;
1257 get_fdc(nr);
1258 (*unit[nr].dtype->write_fkt)(nr);
1259 if (!raw_write(nr)) {
1260 printk (KERN_NOTICE "floppy disk write protected\n");
1261 writefromint = 0;
1262 writepending = 0;
1264 rel_fdc();
1267 static int non_int_flush_track (unsigned long nr)
1269 unsigned long flags;
1271 nr&=3;
1272 writefromint = 0;
1273 del_timer(&post_write_timer);
1274 get_fdc(nr);
1275 if (!fd_motor_on(nr)) {
1276 writepending = 0;
1277 rel_fdc();
1278 return 0;
1280 local_irq_save(flags);
1281 if (writepending != 2) {
1282 local_irq_restore(flags);
1283 (*unit[nr].dtype->write_fkt)(nr);
1284 if (!raw_write(nr)) {
1285 printk (KERN_NOTICE "floppy disk write protected "
1286 "in write!\n");
1287 writepending = 0;
1288 return 0;
1290 wait_event(wait_fd_block, block_flag != 2);
1292 else {
1293 local_irq_restore(flags);
1294 ms_delay(2); /* 2 ms post_write delay */
1295 post_write(nr);
1297 rel_fdc();
1298 return 1;
1301 static int get_track(int drive, int track)
1303 int error, errcnt;
1305 drive&=3;
1306 if (unit[drive].track == track)
1307 return 0;
1308 get_fdc(drive);
1309 if (!fd_motor_on(drive)) {
1310 rel_fdc();
1311 return -1;
1314 if (unit[drive].dirty == 1) {
1315 del_timer (flush_track_timer + drive);
1316 non_int_flush_track (drive);
1318 errcnt = 0;
1319 while (errcnt < MAX_ERRORS) {
1320 if (!fd_seek(drive, track))
1321 return -1;
1322 raw_read(drive);
1323 error = (*unit[drive].dtype->read_fkt)(drive);
1324 if (error == 0) {
1325 rel_fdc();
1326 return 0;
1328 /* Read Error Handling: recalibrate and try again */
1329 unit[drive].track = -1;
1330 errcnt++;
1332 rel_fdc();
1333 return -1;
1336 static void redo_fd_request(void)
1338 unsigned int cnt, block, track, sector;
1339 int drive;
1340 struct amiga_floppy_struct *floppy;
1341 char *data;
1342 unsigned long flags;
1344 repeat:
1345 if (!CURRENT) {
1346 /* Nothing left to do */
1347 return;
1350 floppy = CURRENT->rq_disk->private_data;
1351 drive = floppy - unit;
1353 /* Here someone could investigate to be more efficient */
1354 for (cnt = 0; cnt < CURRENT->current_nr_sectors; cnt++) {
1355 #ifdef DEBUG
1356 printk("fd: sector %ld + %d requested for %s\n",
1357 CURRENT->sector,cnt,
1358 (rq_data_dir(CURRENT) == READ) ? "read" : "write");
1359 #endif
1360 block = CURRENT->sector + cnt;
1361 if ((int)block > floppy->blocks) {
1362 end_request(CURRENT, 0);
1363 goto repeat;
1366 track = block / (floppy->dtype->sects * floppy->type->sect_mult);
1367 sector = block % (floppy->dtype->sects * floppy->type->sect_mult);
1368 data = CURRENT->buffer + 512 * cnt;
1369 #ifdef DEBUG
1370 printk("access to track %d, sector %d, with buffer at "
1371 "0x%08lx\n", track, sector, data);
1372 #endif
1374 if ((rq_data_dir(CURRENT) != READ) && (rq_data_dir(CURRENT) != WRITE)) {
1375 printk(KERN_WARNING "do_fd_request: unknown command\n");
1376 end_request(CURRENT, 0);
1377 goto repeat;
1379 if (get_track(drive, track) == -1) {
1380 end_request(CURRENT, 0);
1381 goto repeat;
1384 switch (rq_data_dir(CURRENT)) {
1385 case READ:
1386 memcpy(data, floppy->trackbuf + sector * 512, 512);
1387 break;
1389 case WRITE:
1390 memcpy(floppy->trackbuf + sector * 512, data, 512);
1392 /* keep the drive spinning while writes are scheduled */
1393 if (!fd_motor_on(drive)) {
1394 end_request(CURRENT, 0);
1395 goto repeat;
1398 * setup a callback to write the track buffer
1399 * after a short (1 tick) delay.
1401 local_irq_save(flags);
1403 floppy->dirty = 1;
1404 /* reset the timer */
1405 mod_timer (flush_track_timer + drive, jiffies + 1);
1406 local_irq_restore(flags);
1407 break;
1410 CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
1411 CURRENT->sector += CURRENT->current_nr_sectors;
1413 end_request(CURRENT, 1);
1414 goto repeat;
1417 static void do_fd_request(struct request_queue * q)
1419 redo_fd_request();
1422 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1424 int drive = MINOR(bdev->bd_dev) & 3;
1426 geo->heads = unit[drive].type->heads;
1427 geo->sectors = unit[drive].dtype->sects * unit[drive].type->sect_mult;
1428 geo->cylinders = unit[drive].type->tracks;
1429 return 0;
1432 static int fd_ioctl(struct block_device *bdev, fmode_t mode,
1433 unsigned int cmd, unsigned long param)
1435 struct amiga_floppy_struct *p = bdev->bd_disk->private_data;
1436 int drive = p - unit;
1437 static struct floppy_struct getprm;
1438 void __user *argp = (void __user *)param;
1440 switch(cmd){
1441 case FDFMTBEG:
1442 get_fdc(drive);
1443 if (fd_ref[drive] > 1) {
1444 rel_fdc();
1445 return -EBUSY;
1447 fsync_bdev(bdev);
1448 if (fd_motor_on(drive) == 0) {
1449 rel_fdc();
1450 return -ENODEV;
1452 if (fd_calibrate(drive) == 0) {
1453 rel_fdc();
1454 return -ENXIO;
1456 floppy_off(drive);
1457 rel_fdc();
1458 break;
1459 case FDFMTTRK:
1460 if (param < p->type->tracks * p->type->heads)
1462 get_fdc(drive);
1463 if (fd_seek(drive,param) != 0){
1464 memset(p->trackbuf, FD_FILL_BYTE,
1465 p->dtype->sects * p->type->sect_mult * 512);
1466 non_int_flush_track(drive);
1468 floppy_off(drive);
1469 rel_fdc();
1471 else
1472 return -EINVAL;
1473 break;
1474 case FDFMTEND:
1475 floppy_off(drive);
1476 invalidate_bdev(bdev);
1477 break;
1478 case FDGETPRM:
1479 memset((void *)&getprm, 0, sizeof (getprm));
1480 getprm.track=p->type->tracks;
1481 getprm.head=p->type->heads;
1482 getprm.sect=p->dtype->sects * p->type->sect_mult;
1483 getprm.size=p->blocks;
1484 if (copy_to_user(argp, &getprm, sizeof(struct floppy_struct)))
1485 return -EFAULT;
1486 break;
1487 case FDSETPRM:
1488 case FDDEFPRM:
1489 return -EINVAL;
1490 case FDFLUSH: /* unconditionally, even if not needed */
1491 del_timer (flush_track_timer + drive);
1492 non_int_flush_track(drive);
1493 break;
1494 #ifdef RAW_IOCTL
1495 case IOCTL_RAW_TRACK:
1496 if (copy_to_user(argp, raw_buf, p->type->read_size))
1497 return -EFAULT;
1498 else
1499 return p->type->read_size;
1500 #endif
1501 default:
1502 printk(KERN_DEBUG "fd_ioctl: unknown cmd %d for drive %d.",
1503 cmd, drive);
1504 return -ENOSYS;
1506 return 0;
1509 static void fd_probe(int dev)
1511 unsigned long code;
1512 int type;
1513 int drive;
1515 drive = dev & 3;
1516 code = fd_get_drive_id(drive);
1518 /* get drive type */
1519 for (type = 0; type < num_dr_types; type++)
1520 if (drive_types[type].code == code)
1521 break;
1523 if (type >= num_dr_types) {
1524 printk(KERN_WARNING "fd_probe: unsupported drive type "
1525 "%08lx found\n", code);
1526 unit[drive].type = &drive_types[num_dr_types-1]; /* FD_NODRIVE */
1527 return;
1530 unit[drive].type = drive_types + type;
1531 unit[drive].track = -1;
1533 unit[drive].disk = -1;
1534 unit[drive].motor = 0;
1535 unit[drive].busy = 0;
1536 unit[drive].status = -1;
1540 * floppy_open check for aliasing (/dev/fd0 can be the same as
1541 * /dev/PS0 etc), and disallows simultaneous access to the same
1542 * drive with different device numbers.
1544 static int floppy_open(struct block_device *bdev, fmode_t mode)
1546 int drive = MINOR(bdev->bd_dev) & 3;
1547 int system = (MINOR(bdev->bd_dev) & 4) >> 2;
1548 int old_dev;
1549 unsigned long flags;
1551 old_dev = fd_device[drive];
1553 if (fd_ref[drive] && old_dev != system)
1554 return -EBUSY;
1556 if (mode & (FMODE_READ|FMODE_WRITE)) {
1557 check_disk_change(bdev);
1558 if (mode & FMODE_WRITE) {
1559 int wrprot;
1561 get_fdc(drive);
1562 fd_select (drive);
1563 wrprot = !(ciaa.pra & DSKPROT);
1564 fd_deselect (drive);
1565 rel_fdc();
1567 if (wrprot)
1568 return -EROFS;
1572 local_irq_save(flags);
1573 fd_ref[drive]++;
1574 fd_device[drive] = system;
1575 local_irq_restore(flags);
1577 unit[drive].dtype=&data_types[system];
1578 unit[drive].blocks=unit[drive].type->heads*unit[drive].type->tracks*
1579 data_types[system].sects*unit[drive].type->sect_mult;
1580 set_capacity(unit[drive].gendisk, unit[drive].blocks);
1582 printk(KERN_INFO "fd%d: accessing %s-disk with %s-layout\n",drive,
1583 unit[drive].type->name, data_types[system].name);
1585 return 0;
1588 static int floppy_release(struct gendisk *disk, fmode_t mode)
1590 struct amiga_floppy_struct *p = disk->private_data;
1591 int drive = p - unit;
1593 if (unit[drive].dirty == 1) {
1594 del_timer (flush_track_timer + drive);
1595 non_int_flush_track (drive);
1598 if (!fd_ref[drive]--) {
1599 printk(KERN_CRIT "floppy_release with fd_ref == 0");
1600 fd_ref[drive] = 0;
1602 #ifdef MODULE
1603 /* the mod_use counter is handled this way */
1604 floppy_off (drive | 0x40000000);
1605 #endif
1606 return 0;
1610 * floppy-change is never called from an interrupt, so we can relax a bit
1611 * here, sleep etc. Note that floppy-on tries to set current_DOR to point
1612 * to the desired drive, but it will probably not survive the sleep if
1613 * several floppies are used at the same time: thus the loop.
1615 static int amiga_floppy_change(struct gendisk *disk)
1617 struct amiga_floppy_struct *p = disk->private_data;
1618 int drive = p - unit;
1619 int changed;
1620 static int first_time = 1;
1622 if (first_time)
1623 changed = first_time--;
1624 else {
1625 get_fdc(drive);
1626 fd_select (drive);
1627 changed = !(ciaa.pra & DSKCHANGE);
1628 fd_deselect (drive);
1629 rel_fdc();
1632 if (changed) {
1633 fd_probe(drive);
1634 p->track = -1;
1635 p->dirty = 0;
1636 writepending = 0; /* if this was true before, too bad! */
1637 writefromint = 0;
1638 return 1;
1640 return 0;
1643 static struct block_device_operations floppy_fops = {
1644 .owner = THIS_MODULE,
1645 .open = floppy_open,
1646 .release = floppy_release,
1647 .locked_ioctl = fd_ioctl,
1648 .getgeo = fd_getgeo,
1649 .media_changed = amiga_floppy_change,
1652 static int __init fd_probe_drives(void)
1654 int drive,drives,nomem;
1656 printk(KERN_INFO "FD: probing units\n" KERN_INFO "found ");
1657 drives=0;
1658 nomem=0;
1659 for(drive=0;drive<FD_MAX_UNITS;drive++) {
1660 struct gendisk *disk;
1661 fd_probe(drive);
1662 if (unit[drive].type->code == FD_NODRIVE)
1663 continue;
1664 disk = alloc_disk(1);
1665 if (!disk) {
1666 unit[drive].type->code = FD_NODRIVE;
1667 continue;
1669 unit[drive].gendisk = disk;
1670 drives++;
1671 if ((unit[drive].trackbuf = kmalloc(FLOPPY_MAX_SECTORS * 512, GFP_KERNEL)) == NULL) {
1672 printk("no mem for ");
1673 unit[drive].type = &drive_types[num_dr_types - 1]; /* FD_NODRIVE */
1674 drives--;
1675 nomem = 1;
1677 printk("fd%d ",drive);
1678 disk->major = FLOPPY_MAJOR;
1679 disk->first_minor = drive;
1680 disk->fops = &floppy_fops;
1681 sprintf(disk->disk_name, "fd%d", drive);
1682 disk->private_data = &unit[drive];
1683 disk->queue = floppy_queue;
1684 set_capacity(disk, 880*2);
1685 add_disk(disk);
1687 if ((drives > 0) || (nomem == 0)) {
1688 if (drives == 0)
1689 printk("no drives");
1690 printk("\n");
1691 return drives;
1693 printk("\n");
1694 return -ENOMEM;
1697 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
1699 int drive = *part & 3;
1700 if (unit[drive].type->code == FD_NODRIVE)
1701 return NULL;
1702 *part = 0;
1703 return get_disk(unit[drive].gendisk);
1706 static int __init amiga_floppy_init(void)
1708 int i, ret;
1710 if (!MACH_IS_AMIGA)
1711 return -ENODEV;
1713 if (!AMIGAHW_PRESENT(AMI_FLOPPY))
1714 return -ENODEV;
1716 if (register_blkdev(FLOPPY_MAJOR,"fd"))
1717 return -EBUSY;
1720 * We request DSKPTR, DSKLEN and DSKDATA only, because the other
1721 * floppy registers are too spreaded over the custom register space
1723 ret = -EBUSY;
1724 if (!request_mem_region(CUSTOM_PHYSADDR+0x20, 8, "amiflop [Paula]")) {
1725 printk("fd: cannot get floppy registers\n");
1726 goto out_blkdev;
1729 ret = -ENOMEM;
1730 if ((raw_buf = (char *)amiga_chip_alloc (RAW_BUF_SIZE, "Floppy")) ==
1731 NULL) {
1732 printk("fd: cannot get chip mem buffer\n");
1733 goto out_memregion;
1736 ret = -EBUSY;
1737 if (request_irq(IRQ_AMIGA_DSKBLK, fd_block_done, 0, "floppy_dma", NULL)) {
1738 printk("fd: cannot get irq for dma\n");
1739 goto out_irq;
1742 if (request_irq(IRQ_AMIGA_CIAA_TB, ms_isr, 0, "floppy_timer", NULL)) {
1743 printk("fd: cannot get irq for timer\n");
1744 goto out_irq2;
1747 ret = -ENOMEM;
1748 floppy_queue = blk_init_queue(do_fd_request, &amiflop_lock);
1749 if (!floppy_queue)
1750 goto out_queue;
1752 ret = -ENODEV;
1753 if (fd_probe_drives() < 1) /* No usable drives */
1754 goto out_probe;
1756 blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
1757 floppy_find, NULL, NULL);
1759 /* initialize variables */
1760 init_timer(&motor_on_timer);
1761 motor_on_timer.expires = 0;
1762 motor_on_timer.data = 0;
1763 motor_on_timer.function = motor_on_callback;
1764 for (i = 0; i < FD_MAX_UNITS; i++) {
1765 init_timer(&motor_off_timer[i]);
1766 motor_off_timer[i].expires = 0;
1767 motor_off_timer[i].data = i|0x80000000;
1768 motor_off_timer[i].function = fd_motor_off;
1769 init_timer(&flush_track_timer[i]);
1770 flush_track_timer[i].expires = 0;
1771 flush_track_timer[i].data = i;
1772 flush_track_timer[i].function = flush_track_callback;
1774 unit[i].track = -1;
1777 init_timer(&post_write_timer);
1778 post_write_timer.expires = 0;
1779 post_write_timer.data = 0;
1780 post_write_timer.function = post_write;
1782 for (i = 0; i < 128; i++)
1783 mfmdecode[i]=255;
1784 for (i = 0; i < 16; i++)
1785 mfmdecode[mfmencode[i]]=i;
1787 /* make sure that disk DMA is enabled */
1788 custom.dmacon = DMAF_SETCLR | DMAF_DISK;
1790 /* init ms timer */
1791 ciaa.crb = 8; /* one-shot, stop */
1792 return 0;
1794 out_probe:
1795 blk_cleanup_queue(floppy_queue);
1796 out_queue:
1797 free_irq(IRQ_AMIGA_CIAA_TB, NULL);
1798 out_irq2:
1799 free_irq(IRQ_AMIGA_DSKBLK, NULL);
1800 out_irq:
1801 amiga_chip_free(raw_buf);
1802 out_memregion:
1803 release_mem_region(CUSTOM_PHYSADDR+0x20, 8);
1804 out_blkdev:
1805 unregister_blkdev(FLOPPY_MAJOR,"fd");
1806 return ret;
1809 module_init(amiga_floppy_init);
1810 #ifdef MODULE
1812 #if 0 /* not safe to unload */
1813 void cleanup_module(void)
1815 int i;
1817 for( i = 0; i < FD_MAX_UNITS; i++) {
1818 if (unit[i].type->code != FD_NODRIVE) {
1819 del_gendisk(unit[i].gendisk);
1820 put_disk(unit[i].gendisk);
1821 kfree(unit[i].trackbuf);
1824 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
1825 free_irq(IRQ_AMIGA_CIAA_TB, NULL);
1826 free_irq(IRQ_AMIGA_DSKBLK, NULL);
1827 custom.dmacon = DMAF_DISK; /* disable DMA */
1828 amiga_chip_free(raw_buf);
1829 blk_cleanup_queue(floppy_queue);
1830 release_mem_region(CUSTOM_PHYSADDR+0x20, 8);
1831 unregister_blkdev(FLOPPY_MAJOR, "fd");
1833 #endif
1835 #else
1836 static int __init amiga_floppy_setup (char *str)
1838 int n;
1839 if (!MACH_IS_AMIGA)
1840 return 0;
1841 if (!get_option(&str, &n))
1842 return 0;
1843 printk (KERN_INFO "amiflop: Setting default df0 to %x\n", n);
1844 fd_def_df0 = n;
1845 return 1;
1848 __setup("floppy=", amiga_floppy_setup);
1849 #endif