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