summaryrefslogtreecommitdiffstats
path: root/drivers/block/swim.c
blob: 2e46815876dfa087bd6f61fef9eee12cdf766512 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
/*
 * Driver for SWIM (Sander Woz Integrated Machine) floppy controller
 *
 * Copyright (C) 2004,2008 Laurent Vivier <Laurent@lvivier.info>
 *
 * based on Alastair Bridgewater SWIM analysis, 2001
 * based on SWIM3 driver (c) Paul Mackerras, 1996
 * based on netBSD IWM driver (c) 1997, 1998 Hauke Fath.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 *
 * 2004-08-21 (lv) - Initial implementation
 * 2008-10-30 (lv) - Port to 2.6
 */

#include <linux/module.h>
#include <linux/fd.h>
#include <linux/slab.h>
#include <linux/blkdev.h>
#include <linux/smp_lock.h>
#include <linux/hdreg.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/platform_device.h>

#include <asm/macintosh.h>
#include <asm/mac_via.h>

#define CARDNAME "swim"

struct sector_header {
	unsigned char side;
	unsigned char track;
	unsigned char sector;
	unsigned char size;
	unsigned char crc0;
	unsigned char crc1;
} __attribute__((packed));

#define DRIVER_VERSION "Version 0.2 (2008-10-30)"

#define REG(x)	unsigned char x, x ## _pad[0x200 - 1];

struct swim {
	REG(write_data)
	REG(write_mark)
	REG(write_CRC)
	REG(write_parameter)
	REG(write_phase)
	REG(write_setup)
	REG(write_mode0)
	REG(write_mode1)

	REG(read_data)
	REG(read_mark)
	REG(read_error)
	REG(read_parameter)
	REG(read_phase)
	REG(read_setup)
	REG(read_status)
	REG(read_handshake)
} __attribute__((packed));

#define swim_write(base, reg, v) 	out_8(&(base)->write_##reg, (v))
#define swim_read(base, reg)		in_8(&(base)->read_##reg)

/* IWM registers */

struct iwm {
	REG(ph0L)
	REG(ph0H)
	REG(ph1L)
	REG(ph1H)
	REG(ph2L)
	REG(ph2H)
	REG(ph3L)
	REG(ph3H)
	REG(mtrOff)
	REG(mtrOn)
	REG(intDrive)
	REG(extDrive)
	REG(q6L)
	REG(q6H)
	REG(q7L)
	REG(q7H)
} __attribute__((packed));

#define iwm_write(base, reg, v) 	out_8(&(base)->reg, (v))
#define iwm_read(base, reg)		in_8(&(base)->reg)

/* bits in phase register */

#define SEEK_POSITIVE	0x070
#define SEEK_NEGATIVE	0x074
#define STEP		0x071
#define MOTOR_ON	0x072
#define MOTOR_OFF	0x076
#define INDEX		0x073
#define EJECT		0x077
#define SETMFM		0x171
#define SETGCR		0x175

#define RELAX		0x033
#define LSTRB		0x008

#define CA_MASK		0x077

/* Select values for swim_select and swim_readbit */

#define READ_DATA_0	0x074
#define TWOMEG_DRIVE	0x075
#define SINGLE_SIDED	0x076
#define DRIVE_PRESENT	0x077
#define DISK_IN		0x170
#define WRITE_PROT	0x171
#define TRACK_ZERO	0x172
#define TACHO		0x173
#define READ_DATA_1	0x174
#define MFM_MODE	0x175
#define SEEK_COMPLETE	0x176
#define ONEMEG_MEDIA	0x177

/* Bits in handshake register */

#define MARK_BYTE	0x01
#define CRC_ZERO	0x02
#define RDDATA		0x04
#define SENSE		0x08
#define MOTEN		0x10
#define ERROR		0x20
#define DAT2BYTE	0x40
#define DAT1BYTE	0x80

/* bits in setup register */

#define S_INV_WDATA	0x01
#define S_3_5_SELECT	0x02
#define S_GCR		0x04
#define S_FCLK_DIV2	0x08
#define S_ERROR_CORR	0x10
#define S_IBM_DRIVE	0x20
#define S_GCR_WRITE	0x40
#define S_TIMEOUT	0x80

/* bits in mode register */

#define CLFIFO		0x01
#define ENBL1		0x02
#define ENBL2		0x04
#define ACTION		0x08
#define WRITE_MODE	0x10
#define HEDSEL		0x20
#define MOTON		0x80

/*----------------------------------------------------------------------------*/

enum drive_location {
	INTERNAL_DRIVE = 0x02,
	EXTERNAL_DRIVE = 0x04,
};

enum media_type {
	DD_MEDIA,
	HD_MEDIA,
};

struct floppy_state {

	/* physical properties */

	enum drive_location location;	/* internal or external drive */
	int		 head_number;	/* single- or double-sided drive */

	/* media */

	int		 disk_in;
	int		 ejected;
	enum media_type	 type;
	int		 write_protected;

	int		 total_secs;
	int		 secpercyl;
	int		 secpertrack;

	/* in-use information */

	int		track;
	int		ref_count;

	struct gendisk *disk;

	/* parent controller */

	struct swim_priv *swd;
};

enum motor_action {
	OFF,
	ON,
};

enum head {
	LOWER_HEAD = 0,
	UPPER_HEAD = 1,
};

#define FD_MAX_UNIT	2

struct swim_priv {
	struct swim __iomem *base;
	spinlock_t lock;
	struct request_queue *queue;
	int floppy_count;
	struct floppy_state unit[FD_MAX_UNIT];
};

extern int swim_read_sector_header(struct swim __iomem *base,
				   struct sector_header *header);
extern int swim_read_sector_data(struct swim __iomem *base,
				 unsigned char *data);

static inline void set_swim_mode(struct swim __iomem *base, int enable)
{
	struct iwm __iomem *iwm_base;
	unsigned long flags;

	if (!enable) {
		swim_write(base, mode0, 0xf8);
		return;
	}

	iwm_base = (struct iwm __iomem *)base;
	local_irq_save(flags);

	iwm_read(iwm_base, q7L);
	iwm_read(iwm_base, mtrOff);
	iwm_read(iwm_base, q6H);

	iwm_write(iwm_base, q7H, 0x57);
	iwm_write(iwm_base, q7H, 0x17);
	iwm_write(iwm_base, q7H, 0x57);
	iwm_write(iwm_base, q7H, 0x57);

	local_irq_restore(flags);
}

static inline int get_swim_mode(struct swim __iomem *base)
{
	unsigned long flags;

	local_irq_save(flags);

	swim_write(base, phase, 0xf5);
	if (swim_read(base, phase) != 0xf5)
		goto is_iwm;
	swim_write(base, phase, 0xf6);
	if (swim_read(base, phase) != 0xf6)
		goto is_iwm;
	swim_write(base, phase, 0xf7);
	if (swim_read(base, phase) != 0xf7)
		goto is_iwm;
	local_irq_restore(flags);
	return 1;
is_iwm:
	local_irq_restore(flags);
	return 0;
}

static inline void swim_select(struct swim __iomem *base, int sel)
{
	swim_write(base, phase, RELAX);

	via1_set_head(sel & 0x100);

	swim_write(base, phase, sel & CA_MASK);
}

static inline void swim_action(struct swim __iomem *base, int action)
{
	unsigned long flags;

	local_irq_save(flags);

	swim_select(base, action);
	udelay(1);
	swim_write(base, phase, (LSTRB<<4) | LSTRB);
	udelay(1);
	swim_write(base, phase, (LSTRB<<4) | ((~LSTRB) & 0x0F));
	udelay(1);

	local_irq_restore(flags);
}

static inline int swim_readbit(struct swim __iomem *base, int bit)
{
	int stat;

	swim_select(base, bit);

	udelay(10);

	stat = swim_read(base, handshake);

	return (stat & SENSE) == 0;
}

static inline void swim_drive(struct swim __iomem *base,
			      enum drive_location location)
{
	if (location == INTERNAL_DRIVE) {
		swim_write(base, mode0, EXTERNAL_DRIVE); /* clear drive 1 bit */
		swim_write(base, mode1, INTERNAL_DRIVE); /* set drive 0 bit */
	} else if (location == EXTERNAL_DRIVE) {
		swim_write(base, mode0, INTERNAL_DRIVE); /* clear drive 0 bit */
		swim_write(base, mode1, EXTERNAL_DRIVE); /* set drive 1 bit */
	}
}

static inline void swim_motor(struct swim __iomem *base,
			      enum motor_action action)
{
	if (action == ON) {
		int i;

		swim_action(base, MOTOR_ON);

		for (i = 0; i < 2*HZ; i++) {
			swim_select(base, RELAX);
			if (swim_readbit(base, MOTOR_ON))
				break;
			current->state = TASK_INTERRUPTIBLE;
			schedule_timeout(1);
		}
	} else if (action == OFF) {
		swim_action(base, MOTOR_OFF);
		swim_select(base, RELAX);
	}
}

static inline void swim_eject(struct swim __iomem *base)
{
	int i;

	swim_action(base, EJECT);

	for (i = 0; i < 2*HZ; i++) {
		swim_select(base, RELAX);
		if (!swim_readbit(base, DISK_IN))
			break;
		current->state = TASK_INTERRUPTIBLE;
		schedule_timeout(1);
	}
	swim_select(base, RELAX);
}

static inline void swim_head(struct swim __iomem *base, enum head head)
{
	/* wait drive is ready */

	if (head == UPPER_HEAD)
		swim_select(base, READ_DATA_1);
	else if (head == LOWER_HEAD)
		swim_select(base, READ_DATA_0);
}

static inline int swim_step(struct swim __iomem *base)
{
	int wait;

	swim_action(base, STEP);

	for (wait = 0; wait < HZ; wait++) {

		current->state = TASK_INTERRUPTIBLE;
		schedule_timeout(1);

		swim_select(base, RELAX);
		if (!swim_readbit(base, STEP))
			return 0;
	}
	return -1;
}

static inline int swim_track00(struct swim __iomem *base)
{
	int try;

	swim_action(base, SEEK_NEGATIVE);

	for (try = 0; try < 100; try++) {

		swim_select(base, RELAX);
		if (swim_readbit(base, TRACK_ZERO))
			break;

		if (swim_step(base))
			return -1;
	}

	if (swim_readbit(base, TRACK_ZERO))
		return 0;

	return -1;
}

static inline int swim_seek(struct swim __iomem *base, int step)
{
	if (step == 0)
		return 0;

	if (step < 0) {
		swim_action(base, SEEK_NEGATIVE);
		step = -step;
	} else
		swim_action(base, SEEK_POSITIVE);

	for ( ; step > 0; step--) {
		if (swim_step(base))
			return -1;
	}

	return 0;
}

static inline int swim_track(struct floppy_state *fs,  int track)
{
	struct swim __iomem *base = fs->swd->base;
	int ret;

	ret = swim_seek(base, track - fs->track);

	if (ret == 0)
		fs->track = track;
	else {
		swim_track00(base);
		fs->track = 0;
	}

	return ret;
}

static int floppy_eject(struct floppy_state *fs)
{
	struct swim __iomem *base = fs->swd->base;

	swim_drive(base, fs->location);
	swim_motor(base, OFF);
	swim_eject(base);

	fs->disk_in = 0;
	fs->ejected = 1;

	return 0;
}

static inline int swim_read_sector(struct floppy_state *fs,
				   int side, int track,
				   int sector, unsigned char *buffer)
{
	struct swim __iomem *base = fs->swd->base;
	unsigned long flags;
	struct sector_header header;
	int ret = -1;
	short i;

	swim_track(fs, track);

	swim_write(base, mode1, MOTON);
	swim_head(base, side);
	swim_write(base, mode0, side);

	local_irq_save(flags);
	for (i = 0; i < 36; i++) {
		ret = swim_read_sector_header(base, &header);
		if (!ret && (header.sector == sector)) {
			/* found */

			ret = swim_read_sector_data(base, buffer);
			break;
		}
	}
	local_irq_restore(flags);

	swim_write(base, mode0, MOTON);

	if ((header.side != side)  || (header.track != track) ||
	     (header.sector != sector))
		return 0;

	return ret;
}

static int floppy_read_sectors(struct floppy_state *fs,
			       int req_sector, int sectors_nb,
			       unsigned char *buffer)
{
	struct swim __iomem *base = fs->swd->base;
	int ret;
	int side, track, sector;
	int i, try;


	swim_drive(base, fs->location);
	for (i = req_sector; i < req_sector + sectors_nb; i++) {
		int x;
		track = i / fs->secpercyl;
		x = i % fs->secpercyl;
		side = x / fs->secpertrack;
		sector = x % fs->secpertrack + 1;

		try = 5;
		do {
			ret = swim_read_sector(fs, side, track, sector,
						buffer);
			if (try-- == 0)
				return -EIO;
		} while (ret != 512);

		buffer += ret;
	}

	return 0;
}

static void redo_fd_request(struct request_queue *q)
{
	struct request *req;
	struct floppy_state *fs;

	req = blk_fetch_request(q);
	while (req) {
		int err = -EIO;

		fs = req->rq_disk->private_data;
		if (blk_rq_pos(req) >= fs->total_secs)
			goto done;
		if (!fs->disk_in)
			goto done;
		if (rq_data_dir(req) == WRITE && fs->write_protected)
			goto done;

		switch (rq_data_dir(req)) {
		case WRITE:
			/* NOT IMPLEMENTED */
			break;
		case READ:
			err = floppy_read_sectors(fs, blk_rq_pos(req),
						  blk_rq_cur_sectors(req),
						  req->buffer);
			break;
		}
	done:
		if (!__blk_end_request_cur(req, err))
			req = blk_fetch_request(q);
	}
}

static void do_fd_request(struct request_queue *q)
{
	redo_fd_request(q);
}

static struct floppy_struct floppy_type[4] = {
	{    0,  0, 0,  0, 0, 0x00, 0x00, 0x00, 0x00, NULL }, /* no testing   */
	{  720,  9, 1, 80, 0, 0x2A, 0x02, 0xDF, 0x50, NULL }, /* 360KB SS 3.5"*/
	{ 1440,  9, 2, 80, 0, 0x2A, 0x02, 0xDF, 0x50, NULL }, /* 720KB 3.5"   */
	{ 2880, 18, 2, 80, 0, 0x1B, 0x00, 0xCF, 0x6C, NULL }, /* 1.44MB 3.5"  */
};

static int get_floppy_geometry(struct floppy_state *fs, int type,
			       struct floppy_struct **g)
{
	if (type >= ARRAY_SIZE(floppy_type))
		return -EINVAL;

	if (type)
		*g = &floppy_type[type];
	else if (fs->type == HD_MEDIA) /* High-Density media */
		*g = &floppy_type[3];
	else if (fs->head_number == 2) /* double-sided */
		*g = &floppy_type[2];
	else
		*g = &floppy_type[1];

	return 0;
}

static void setup_medium(struct floppy_state *fs)
{
	struct swim __iomem *base = fs->swd->base;

	if (swim_readbit(base, DISK_IN)) {
		struct floppy_struct *g;
		fs->disk_in = 1;
		fs->write_protected = swim_readbit(base, WRITE_PROT);
		fs->type = swim_readbit(base, ONEMEG_MEDIA);

		if (swim_track00(base))
			printk(KERN_ERR
				"SWIM: cannot move floppy head to track 0\n");

		swim_track00(base);

		get_floppy_geometry(fs, 0, &g);
		fs->total_secs = g->size;
		fs->secpercyl = g->head * g->sect;
		fs->secpertrack = g->sect;
		fs->track = 0;
	} else {
		fs->disk_in = 0;
	}
}

static int floppy_open(struct block_device *bdev, fmode_t mode)
{
	struct floppy_state *fs = bdev->bd_disk->private_data;
	struct swim __iomem *base = fs->swd->base;
	int err;

	if (fs->ref_count == -1 || (fs->ref_count && mode & FMODE_EXCL))
		return -EBUSY;

	if (mode & FMODE_EXCL)
		fs->ref_count = -1;
	else
		fs->ref_count++;

	swim_write(base, setup, S_IBM_DRIVE  | S_FCLK_DIV2);
	udelay(10);
	swim_drive(base, INTERNAL_DRIVE);
	swim_motor(base, ON);
	swim_action(base, SETMFM);
	if (fs->ejected)
		setup_medium(fs);
	if (!fs->disk_in) {
		err = -ENXIO;
		goto out;
	}

	if (mode & FMODE_NDELAY)
		return 0;

	if (mode & (FMODE_READ|FMODE_WRITE)) {
		check_disk_change(bdev);
		if ((mode & FMODE_WRITE) && fs->write_protected) {
			err = -EROFS;
			goto out;
		}
	}
	return 0;
out:
	if (fs->ref_count < 0)
		fs->ref_count = 0;
	else if (fs->ref_count > 0)
		--fs->ref_count;

	if (fs->ref_count == 0)
		swim_motor(base, OFF);
	return err;
}

static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
{
	int ret;

	lock_kernel();
	ret = floppy_open(bdev, mode);
	unlock_kernel();

	return ret;
}

static int floppy_release(struct gendisk *disk, fmode_t mode)
{
	struct floppy_state *fs = disk->private_data;
	struct swim __iomem *base = fs->swd->base;

	lock_kernel();
	if (fs->ref_count < 0)
		fs->ref_count = 0;
	else if (fs->ref_count > 0)
		--fs->ref_count;

	if (fs->ref_count == 0)
		swim_motor(base, OFF);
	unlock_kernel();

	return 0;
}

static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
			unsigned int cmd, unsigned long param)
{
	struct floppy_state *fs = bdev->bd_disk->private_data;
	int err;

	if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
			return -EPERM;

	switch (cmd) {
	case FDEJECT:
		if (fs->ref_count != 1)
			return -EBUSY;
		lock_kernel();
		err = floppy_eject(fs);
		unlock_kernel();
		return err;

	case FDGETPRM:
		if (copy_to_user((void __user *) param, (void *) &floppy_type,
				 sizeof(struct floppy_struct)))
			return -EFAULT;
		break;

	default:
		printk(KERN_DEBUG "SWIM floppy_ioctl: unknown cmd %d\n",
		       cmd);
		return -ENOSYS;
	}
	return 0;
}

static int floppy_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
	struct floppy_state *fs = bdev->bd_disk->private_data;
	struct floppy_struct *g;
	int ret;

	ret = get_floppy_geometry(fs, 0, &g);
	if (ret)
		return ret;

	geo->heads = g->head;
	geo->sectors = g->sect;
	geo->cylinders = g->track;

	return 0;
}

static int floppy_check_change(struct gendisk *disk)
{
	struct floppy_state *fs = disk->private_data;

	return fs->ejected;
}

static int floppy_revalidate(struct gendisk *disk)
{
	struct floppy_state *fs = disk->private_data;
	struct swim __iomem *base = fs->swd->base;

	swim_drive(base, fs->location);

	if (fs->ejected)
		setup_medium(fs);

	if (!fs->disk_in)
		swim_motor(base, OFF);
	else
		fs->ejected = 0;

	return !fs->disk_in;
}

static const struct block_device_operations floppy_fops = {
	.owner		 = THIS_MODULE,
	.open		 = floppy_unlocked_open,
	.release	 = floppy_release,
	.ioctl		 = floppy_ioctl,
	.getgeo		 = floppy_getgeo,
	.media_changed	 = floppy_check_change,
	.revalidate_disk = floppy_revalidate,
};

static struct kobject *floppy_find(dev_t dev, int *part, void *data)
{
	struct swim_priv *swd = data;
	int drive = (*part & 3);

	if (drive > swd->floppy_count)
		return NULL;

	*part = 0;
	return get_disk(swd->unit[drive].disk);
}

static int __devinit swim_add_floppy(struct swim_priv *swd,
				     enum drive_location location)
{
	struct floppy_state *fs = &swd->unit[swd->floppy_count];
	struct swim __iomem *base = swd->base;

	fs->location = location;

	swim_drive(base, location);

	swim_motor(base, OFF);

	if (swim_readbit(base, SINGLE_SIDED))
		fs->head_number = 1;
	else
		fs->head_number = 2;
	fs->ref_count = 0;
	fs->ejected = 1;

	swd->floppy_count++;

	return 0;
}

static int __devinit swim_floppy_init(struct swim_priv *swd)
{
	int err;
	int drive;
	struct swim __iomem *base = swd->base;

	/* scan floppy drives */

	swim_drive(base, INTERNAL_DRIVE);
	if (swim_readbit(base, DRIVE_PRESENT))
		swim_add_floppy(swd, INTERNAL_DRIVE);
	swim_drive(base, EXTERNAL_DRIVE);
	if (swim_readbit(base, DRIVE_PRESENT))
		swim_add_floppy(swd, EXTERNAL_DRIVE);

	/* register floppy drives */

	err = register_blkdev(FLOPPY_MAJOR, "fd");
	if (err) {
		printk(KERN_ERR "Unable to get major %d for SWIM floppy\n",
		       FLOPPY_MAJOR);
		return -EBUSY;
	}

	for (drive = 0; drive < swd->floppy_count; drive++) {
		swd->unit[drive].disk = alloc_disk(1);
		if (swd->unit[drive].disk == NULL) {
			err = -ENOMEM;
			goto exit_put_disks;
		}
		swd->unit[drive].swd = swd;
	}

	swd->queue = blk_init_queue(do_fd_request, &swd->lock);
	if (!swd->queue) {
		err = -ENOMEM;
		goto exit_put_disks;
	}

	for (drive = 0; drive < swd->floppy_count; drive++) {
		swd->unit[drive].disk->flags = GENHD_FL_REMOVABLE;
		swd->unit[drive].disk->major = FLOPPY_MAJOR;
		swd->unit[drive].disk->first_minor = drive;
		sprintf(swd->unit[drive].disk->disk_name, "fd%d", drive);
		swd->unit[drive].disk->fops = &floppy_fops;
		swd->unit[drive].disk->private_data = &swd->unit[drive];
		swd->unit[drive].disk->queue = swd->queue;
		set_capacity(swd->unit[drive].disk, 2880);
		add_disk(swd->unit[drive].disk);
	}

	blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
			    floppy_find, NULL, swd);

	return 0;

exit_put_disks:
	unregister_blkdev(FLOPPY_MAJOR, "fd");
	while (drive--)
		put_disk(swd->unit[drive].disk);
	return err;
}

static int __devinit swim_probe(struct platform_device *dev)
{
	struct resource *res;
	struct swim __iomem *swim_base;
	struct swim_priv *swd;
	int ret;

	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
	if (!res) {
		ret = -ENODEV;
		goto out;
	}

	if (!request_mem_region(res->start, resource_size(res), CARDNAME)) {
		ret = -EBUSY;
		goto out;
	}

	swim_base = ioremap(res->start, resource_size(res));
	if (!swim_base) {
		return -ENOMEM;
		goto out_release_io;
	}

	/* probe device */

	set_swim_mode(swim_base, 1);
	if (!get_swim_mode(swim_base)) {
		printk(KERN_INFO "SWIM device not found !\n");
		ret = -ENODEV;
		goto out_iounmap;
	}

	/* set platform driver data */

	swd = kzalloc(sizeof(struct swim_priv), GFP_KERNEL);
	if (!swd) {
		ret = -ENOMEM;
		goto out_iounmap;
	}
	platform_set_drvdata(dev, swd);

	swd->base = swim_base;

	ret = swim_floppy_init(swd);
	if (ret)
		goto out_kfree;

	return 0;

out_kfree:
	platform_set_drvdata(dev, NULL);
	kfree(swd);
out_iounmap:
	iounmap(swim_base);
out_release_io:
	release_mem_region(res->start, resource_size(res));
out:
	return ret;
}

static int __devexit swim_remove(struct platform_device *dev)
{
	struct swim_priv *swd = platform_get_drvdata(dev);
	int drive;
	struct resource *res;

	blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);

	for (drive = 0; drive < swd->floppy_count; drive++) {
		del_gendisk(swd->unit[drive].disk);
		put_disk(swd->unit[drive].disk);
	}

	unregister_blkdev(FLOPPY_MAJOR, "fd");

	blk_cleanup_queue(swd->queue);

	/* eject floppies */

	for (drive = 0; drive < swd->floppy_count; drive++)
		floppy_eject(&swd->unit[drive]);

	iounmap(swd->base);

	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
	if (res)
		release_mem_region(res->start, resource_size(res));

	platform_set_drvdata(dev, NULL);
	kfree(swd);

	return 0;
}

static struct platform_driver swim_driver = {
	.probe  = swim_probe,
	.remove = __devexit_p(swim_remove),
	.driver   = {
		.name	= CARDNAME,
		.owner	= THIS_MODULE,
	},
};

static int __init swim_init(void)
{
	printk(KERN_INFO "SWIM floppy driver %s\n", DRIVER_VERSION);

	return platform_driver_register(&swim_driver);
}
module_init(swim_init);

static void __exit swim_exit(void)
{
	platform_driver_unregister(&swim_driver);
}
module_exit(swim_exit);

MODULE_DESCRIPTION("Driver for SWIM floppy controller");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Laurent Vivier <laurent@lvivier.info>");
MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);