writeback: add name to backing_dev_info
[linux-2.6.git] / drivers / block / swim.c
1 /*
2  * Driver for SWIM (Sander Woz Integrated Machine) floppy controller
3  *
4  * Copyright (C) 2004,2008 Laurent Vivier <Laurent@lvivier.info>
5  *
6  * based on Alastair Bridgewater SWIM analysis, 2001
7  * based on SWIM3 driver (c) Paul Mackerras, 1996
8  * based on netBSD IWM driver (c) 1997, 1998 Hauke Fath.
9  *
10  * This program is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU General Public License
12  * as published by the Free Software Foundation; either version
13  * 2 of the License, or (at your option) any later version.
14  *
15  * 2004-08-21 (lv) - Initial implementation
16  * 2008-10-30 (lv) - Port to 2.6
17  */
18
19 #include <linux/module.h>
20 #include <linux/fd.h>
21 #include <linux/blkdev.h>
22 #include <linux/hdreg.h>
23 #include <linux/kernel.h>
24 #include <linux/delay.h>
25 #include <linux/platform_device.h>
26
27 #include <asm/macintosh.h>
28 #include <asm/mac_via.h>
29
30 #define CARDNAME "swim"
31
32 struct sector_header {
33         unsigned char side;
34         unsigned char track;
35         unsigned char sector;
36         unsigned char size;
37         unsigned char crc0;
38         unsigned char crc1;
39 } __attribute__((packed));
40
41 #define DRIVER_VERSION "Version 0.2 (2008-10-30)"
42
43 #define REG(x)  unsigned char x, x ## _pad[0x200 - 1];
44
45 struct swim {
46         REG(write_data)
47         REG(write_mark)
48         REG(write_CRC)
49         REG(write_parameter)
50         REG(write_phase)
51         REG(write_setup)
52         REG(write_mode0)
53         REG(write_mode1)
54
55         REG(read_data)
56         REG(read_mark)
57         REG(read_error)
58         REG(read_parameter)
59         REG(read_phase)
60         REG(read_setup)
61         REG(read_status)
62         REG(read_handshake)
63 } __attribute__((packed));
64
65 #define swim_write(base, reg, v)        out_8(&(base)->write_##reg, (v))
66 #define swim_read(base, reg)            in_8(&(base)->read_##reg)
67
68 /* IWM registers */
69
70 struct iwm {
71         REG(ph0L)
72         REG(ph0H)
73         REG(ph1L)
74         REG(ph1H)
75         REG(ph2L)
76         REG(ph2H)
77         REG(ph3L)
78         REG(ph3H)
79         REG(mtrOff)
80         REG(mtrOn)
81         REG(intDrive)
82         REG(extDrive)
83         REG(q6L)
84         REG(q6H)
85         REG(q7L)
86         REG(q7H)
87 } __attribute__((packed));
88
89 #define iwm_write(base, reg, v)         out_8(&(base)->reg, (v))
90 #define iwm_read(base, reg)             in_8(&(base)->reg)
91
92 /* bits in phase register */
93
94 #define SEEK_POSITIVE   0x070
95 #define SEEK_NEGATIVE   0x074
96 #define STEP            0x071
97 #define MOTOR_ON        0x072
98 #define MOTOR_OFF       0x076
99 #define INDEX           0x073
100 #define EJECT           0x077
101 #define SETMFM          0x171
102 #define SETGCR          0x175
103
104 #define RELAX           0x033
105 #define LSTRB           0x008
106
107 #define CA_MASK         0x077
108
109 /* Select values for swim_select and swim_readbit */
110
111 #define READ_DATA_0     0x074
112 #define TWOMEG_DRIVE    0x075
113 #define SINGLE_SIDED    0x076
114 #define DRIVE_PRESENT   0x077
115 #define DISK_IN         0x170
116 #define WRITE_PROT      0x171
117 #define TRACK_ZERO      0x172
118 #define TACHO           0x173
119 #define READ_DATA_1     0x174
120 #define MFM_MODE        0x175
121 #define SEEK_COMPLETE   0x176
122 #define ONEMEG_MEDIA    0x177
123
124 /* Bits in handshake register */
125
126 #define MARK_BYTE       0x01
127 #define CRC_ZERO        0x02
128 #define RDDATA          0x04
129 #define SENSE           0x08
130 #define MOTEN           0x10
131 #define ERROR           0x20
132 #define DAT2BYTE        0x40
133 #define DAT1BYTE        0x80
134
135 /* bits in setup register */
136
137 #define S_INV_WDATA     0x01
138 #define S_3_5_SELECT    0x02
139 #define S_GCR           0x04
140 #define S_FCLK_DIV2     0x08
141 #define S_ERROR_CORR    0x10
142 #define S_IBM_DRIVE     0x20
143 #define S_GCR_WRITE     0x40
144 #define S_TIMEOUT       0x80
145
146 /* bits in mode register */
147
148 #define CLFIFO          0x01
149 #define ENBL1           0x02
150 #define ENBL2           0x04
151 #define ACTION          0x08
152 #define WRITE_MODE      0x10
153 #define HEDSEL          0x20
154 #define MOTON           0x80
155
156 /*----------------------------------------------------------------------------*/
157
158 enum drive_location {
159         INTERNAL_DRIVE = 0x02,
160         EXTERNAL_DRIVE = 0x04,
161 };
162
163 enum media_type {
164         DD_MEDIA,
165         HD_MEDIA,
166 };
167
168 struct floppy_state {
169
170         /* physical properties */
171
172         enum drive_location location;   /* internal or external drive */
173         int              head_number;   /* single- or double-sided drive */
174
175         /* media */
176
177         int              disk_in;
178         int              ejected;
179         enum media_type  type;
180         int              write_protected;
181
182         int              total_secs;
183         int              secpercyl;
184         int              secpertrack;
185
186         /* in-use information */
187
188         int             track;
189         int             ref_count;
190
191         struct gendisk *disk;
192
193         /* parent controller */
194
195         struct swim_priv *swd;
196 };
197
198 enum motor_action {
199         OFF,
200         ON,
201 };
202
203 enum head {
204         LOWER_HEAD = 0,
205         UPPER_HEAD = 1,
206 };
207
208 #define FD_MAX_UNIT     2
209
210 struct swim_priv {
211         struct swim __iomem *base;
212         spinlock_t lock;
213         struct request_queue *queue;
214         int floppy_count;
215         struct floppy_state unit[FD_MAX_UNIT];
216 };
217
218 extern int swim_read_sector_header(struct swim __iomem *base,
219                                    struct sector_header *header);
220 extern int swim_read_sector_data(struct swim __iomem *base,
221                                  unsigned char *data);
222
223 static inline void set_swim_mode(struct swim __iomem *base, int enable)
224 {
225         struct iwm __iomem *iwm_base;
226         unsigned long flags;
227
228         if (!enable) {
229                 swim_write(base, mode0, 0xf8);
230                 return;
231         }
232
233         iwm_base = (struct iwm __iomem *)base;
234         local_irq_save(flags);
235
236         iwm_read(iwm_base, q7L);
237         iwm_read(iwm_base, mtrOff);
238         iwm_read(iwm_base, q6H);
239
240         iwm_write(iwm_base, q7H, 0x57);
241         iwm_write(iwm_base, q7H, 0x17);
242         iwm_write(iwm_base, q7H, 0x57);
243         iwm_write(iwm_base, q7H, 0x57);
244
245         local_irq_restore(flags);
246 }
247
248 static inline int get_swim_mode(struct swim __iomem *base)
249 {
250         unsigned long flags;
251
252         local_irq_save(flags);
253
254         swim_write(base, phase, 0xf5);
255         if (swim_read(base, phase) != 0xf5)
256                 goto is_iwm;
257         swim_write(base, phase, 0xf6);
258         if (swim_read(base, phase) != 0xf6)
259                 goto is_iwm;
260         swim_write(base, phase, 0xf7);
261         if (swim_read(base, phase) != 0xf7)
262                 goto is_iwm;
263         local_irq_restore(flags);
264         return 1;
265 is_iwm:
266         local_irq_restore(flags);
267         return 0;
268 }
269
270 static inline void swim_select(struct swim __iomem *base, int sel)
271 {
272         swim_write(base, phase, RELAX);
273
274         via1_set_head(sel & 0x100);
275
276         swim_write(base, phase, sel & CA_MASK);
277 }
278
279 static inline void swim_action(struct swim __iomem *base, int action)
280 {
281         unsigned long flags;
282
283         local_irq_save(flags);
284
285         swim_select(base, action);
286         udelay(1);
287         swim_write(base, phase, (LSTRB<<4) | LSTRB);
288         udelay(1);
289         swim_write(base, phase, (LSTRB<<4) | ((~LSTRB) & 0x0F));
290         udelay(1);
291
292         local_irq_restore(flags);
293 }
294
295 static inline int swim_readbit(struct swim __iomem *base, int bit)
296 {
297         int stat;
298
299         swim_select(base, bit);
300
301         udelay(10);
302
303         stat = swim_read(base, handshake);
304
305         return (stat & SENSE) == 0;
306 }
307
308 static inline void swim_drive(struct swim __iomem *base,
309                               enum drive_location location)
310 {
311         if (location == INTERNAL_DRIVE) {
312                 swim_write(base, mode0, EXTERNAL_DRIVE); /* clear drive 1 bit */
313                 swim_write(base, mode1, INTERNAL_DRIVE); /* set drive 0 bit */
314         } else if (location == EXTERNAL_DRIVE) {
315                 swim_write(base, mode0, INTERNAL_DRIVE); /* clear drive 0 bit */
316                 swim_write(base, mode1, EXTERNAL_DRIVE); /* set drive 1 bit */
317         }
318 }
319
320 static inline void swim_motor(struct swim __iomem *base,
321                               enum motor_action action)
322 {
323         if (action == ON) {
324                 int i;
325
326                 swim_action(base, MOTOR_ON);
327
328                 for (i = 0; i < 2*HZ; i++) {
329                         swim_select(base, RELAX);
330                         if (swim_readbit(base, MOTOR_ON))
331                                 break;
332                         current->state = TASK_INTERRUPTIBLE;
333                         schedule_timeout(1);
334                 }
335         } else if (action == OFF) {
336                 swim_action(base, MOTOR_OFF);
337                 swim_select(base, RELAX);
338         }
339 }
340
341 static inline void swim_eject(struct swim __iomem *base)
342 {
343         int i;
344
345         swim_action(base, EJECT);
346
347         for (i = 0; i < 2*HZ; i++) {
348                 swim_select(base, RELAX);
349                 if (!swim_readbit(base, DISK_IN))
350                         break;
351                 current->state = TASK_INTERRUPTIBLE;
352                 schedule_timeout(1);
353         }
354         swim_select(base, RELAX);
355 }
356
357 static inline void swim_head(struct swim __iomem *base, enum head head)
358 {
359         /* wait drive is ready */
360
361         if (head == UPPER_HEAD)
362                 swim_select(base, READ_DATA_1);
363         else if (head == LOWER_HEAD)
364                 swim_select(base, READ_DATA_0);
365 }
366
367 static inline int swim_step(struct swim __iomem *base)
368 {
369         int wait;
370
371         swim_action(base, STEP);
372
373         for (wait = 0; wait < HZ; wait++) {
374
375                 current->state = TASK_INTERRUPTIBLE;
376                 schedule_timeout(1);
377
378                 swim_select(base, RELAX);
379                 if (!swim_readbit(base, STEP))
380                         return 0;
381         }
382         return -1;
383 }
384
385 static inline int swim_track00(struct swim __iomem *base)
386 {
387         int try;
388
389         swim_action(base, SEEK_NEGATIVE);
390
391         for (try = 0; try < 100; try++) {
392
393                 swim_select(base, RELAX);
394                 if (swim_readbit(base, TRACK_ZERO))
395                         break;
396
397                 if (swim_step(base))
398                         return -1;
399         }
400
401         if (swim_readbit(base, TRACK_ZERO))
402                 return 0;
403
404         return -1;
405 }
406
407 static inline int swim_seek(struct swim __iomem *base, int step)
408 {
409         if (step == 0)
410                 return 0;
411
412         if (step < 0) {
413                 swim_action(base, SEEK_NEGATIVE);
414                 step = -step;
415         } else
416                 swim_action(base, SEEK_POSITIVE);
417
418         for ( ; step > 0; step--) {
419                 if (swim_step(base))
420                         return -1;
421         }
422
423         return 0;
424 }
425
426 static inline int swim_track(struct floppy_state *fs,  int track)
427 {
428         struct swim __iomem *base = fs->swd->base;
429         int ret;
430
431         ret = swim_seek(base, track - fs->track);
432
433         if (ret == 0)
434                 fs->track = track;
435         else {
436                 swim_track00(base);
437                 fs->track = 0;
438         }
439
440         return ret;
441 }
442
443 static int floppy_eject(struct floppy_state *fs)
444 {
445         struct swim __iomem *base = fs->swd->base;
446
447         swim_drive(base, fs->location);
448         swim_motor(base, OFF);
449         swim_eject(base);
450
451         fs->disk_in = 0;
452         fs->ejected = 1;
453
454         return 0;
455 }
456
457 static inline int swim_read_sector(struct floppy_state *fs,
458                                    int side, int track,
459                                    int sector, unsigned char *buffer)
460 {
461         struct swim __iomem *base = fs->swd->base;
462         unsigned long flags;
463         struct sector_header header;
464         int ret = -1;
465         short i;
466
467         swim_track(fs, track);
468
469         swim_write(base, mode1, MOTON);
470         swim_head(base, side);
471         swim_write(base, mode0, side);
472
473         local_irq_save(flags);
474         for (i = 0; i < 36; i++) {
475                 ret = swim_read_sector_header(base, &header);
476                 if (!ret && (header.sector == sector)) {
477                         /* found */
478
479                         ret = swim_read_sector_data(base, buffer);
480                         break;
481                 }
482         }
483         local_irq_restore(flags);
484
485         swim_write(base, mode0, MOTON);
486
487         if ((header.side != side)  || (header.track != track) ||
488              (header.sector != sector))
489                 return 0;
490
491         return ret;
492 }
493
494 static int floppy_read_sectors(struct floppy_state *fs,
495                                int req_sector, int sectors_nb,
496                                unsigned char *buffer)
497 {
498         struct swim __iomem *base = fs->swd->base;
499         int ret;
500         int side, track, sector;
501         int i, try;
502
503
504         swim_drive(base, fs->location);
505         for (i = req_sector; i < req_sector + sectors_nb; i++) {
506                 int x;
507                 track = i / fs->secpercyl;
508                 x = i % fs->secpercyl;
509                 side = x / fs->secpertrack;
510                 sector = x % fs->secpertrack + 1;
511
512                 try = 5;
513                 do {
514                         ret = swim_read_sector(fs, side, track, sector,
515                                                 buffer);
516                         if (try-- == 0)
517                                 return -EIO;
518                 } while (ret != 512);
519
520                 buffer += ret;
521         }
522
523         return 0;
524 }
525
526 static void redo_fd_request(struct request_queue *q)
527 {
528         struct request *req;
529         struct floppy_state *fs;
530
531         req = blk_fetch_request(q);
532         while (req) {
533                 int err = -EIO;
534
535                 fs = req->rq_disk->private_data;
536                 if (blk_rq_pos(req) >= fs->total_secs)
537                         goto done;
538                 if (!fs->disk_in)
539                         goto done;
540                 if (rq_data_dir(req) == WRITE && fs->write_protected)
541                         goto done;
542
543                 switch (rq_data_dir(req)) {
544                 case WRITE:
545                         /* NOT IMPLEMENTED */
546                         break;
547                 case READ:
548                         err = floppy_read_sectors(fs, blk_rq_pos(req),
549                                                   blk_rq_cur_sectors(req),
550                                                   req->buffer);
551                         break;
552                 }
553         done:
554                 if (!__blk_end_request_cur(req, err))
555                         req = blk_fetch_request(q);
556         }
557 }
558
559 static void do_fd_request(struct request_queue *q)
560 {
561         redo_fd_request(q);
562 }
563
564 static struct floppy_struct floppy_type[4] = {
565         {    0,  0, 0,  0, 0, 0x00, 0x00, 0x00, 0x00, NULL }, /* no testing   */
566         {  720,  9, 1, 80, 0, 0x2A, 0x02, 0xDF, 0x50, NULL }, /* 360KB SS 3.5"*/
567         { 1440,  9, 2, 80, 0, 0x2A, 0x02, 0xDF, 0x50, NULL }, /* 720KB 3.5"   */
568         { 2880, 18, 2, 80, 0, 0x1B, 0x00, 0xCF, 0x6C, NULL }, /* 1.44MB 3.5"  */
569 };
570
571 static int get_floppy_geometry(struct floppy_state *fs, int type,
572                                struct floppy_struct **g)
573 {
574         if (type >= ARRAY_SIZE(floppy_type))
575                 return -EINVAL;
576
577         if (type)
578                 *g = &floppy_type[type];
579         else if (fs->type == HD_MEDIA) /* High-Density media */
580                 *g = &floppy_type[3];
581         else if (fs->head_number == 2) /* double-sided */
582                 *g = &floppy_type[2];
583         else
584                 *g = &floppy_type[1];
585
586         return 0;
587 }
588
589 static void setup_medium(struct floppy_state *fs)
590 {
591         struct swim __iomem *base = fs->swd->base;
592
593         if (swim_readbit(base, DISK_IN)) {
594                 struct floppy_struct *g;
595                 fs->disk_in = 1;
596                 fs->write_protected = swim_readbit(base, WRITE_PROT);
597                 fs->type = swim_readbit(base, ONEMEG_MEDIA);
598
599                 if (swim_track00(base))
600                         printk(KERN_ERR
601                                 "SWIM: cannot move floppy head to track 0\n");
602
603                 swim_track00(base);
604
605                 get_floppy_geometry(fs, 0, &g);
606                 fs->total_secs = g->size;
607                 fs->secpercyl = g->head * g->sect;
608                 fs->secpertrack = g->sect;
609                 fs->track = 0;
610         } else {
611                 fs->disk_in = 0;
612         }
613 }
614
615 static int floppy_open(struct block_device *bdev, fmode_t mode)
616 {
617         struct floppy_state *fs = bdev->bd_disk->private_data;
618         struct swim __iomem *base = fs->swd->base;
619         int err;
620
621         if (fs->ref_count == -1 || (fs->ref_count && mode & FMODE_EXCL))
622                 return -EBUSY;
623
624         if (mode & FMODE_EXCL)
625                 fs->ref_count = -1;
626         else
627                 fs->ref_count++;
628
629         swim_write(base, setup, S_IBM_DRIVE  | S_FCLK_DIV2);
630         udelay(10);
631         swim_drive(base, INTERNAL_DRIVE);
632         swim_motor(base, ON);
633         swim_action(base, SETMFM);
634         if (fs->ejected)
635                 setup_medium(fs);
636         if (!fs->disk_in) {
637                 err = -ENXIO;
638                 goto out;
639         }
640
641         if (mode & FMODE_NDELAY)
642                 return 0;
643
644         if (mode & (FMODE_READ|FMODE_WRITE)) {
645                 check_disk_change(bdev);
646                 if ((mode & FMODE_WRITE) && fs->write_protected) {
647                         err = -EROFS;
648                         goto out;
649                 }
650         }
651         return 0;
652 out:
653         if (fs->ref_count < 0)
654                 fs->ref_count = 0;
655         else if (fs->ref_count > 0)
656                 --fs->ref_count;
657
658         if (fs->ref_count == 0)
659                 swim_motor(base, OFF);
660         return err;
661 }
662
663 static int floppy_release(struct gendisk *disk, fmode_t mode)
664 {
665         struct floppy_state *fs = disk->private_data;
666         struct swim __iomem *base = fs->swd->base;
667
668         if (fs->ref_count < 0)
669                 fs->ref_count = 0;
670         else if (fs->ref_count > 0)
671                 --fs->ref_count;
672
673         if (fs->ref_count == 0)
674                 swim_motor(base, OFF);
675
676         return 0;
677 }
678
679 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
680                         unsigned int cmd, unsigned long param)
681 {
682         struct floppy_state *fs = bdev->bd_disk->private_data;
683         int err;
684
685         if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
686                         return -EPERM;
687
688         switch (cmd) {
689         case FDEJECT:
690                 if (fs->ref_count != 1)
691                         return -EBUSY;
692                 err = floppy_eject(fs);
693                 return err;
694
695         case FDGETPRM:
696                 if (copy_to_user((void __user *) param, (void *) &floppy_type,
697                                  sizeof(struct floppy_struct)))
698                         return -EFAULT;
699                 break;
700
701         default:
702                 printk(KERN_DEBUG "SWIM floppy_ioctl: unknown cmd %d\n",
703                        cmd);
704                 return -ENOSYS;
705         }
706         return 0;
707 }
708
709 static int floppy_getgeo(struct block_device *bdev, struct hd_geometry *geo)
710 {
711         struct floppy_state *fs = bdev->bd_disk->private_data;
712         struct floppy_struct *g;
713         int ret;
714
715         ret = get_floppy_geometry(fs, 0, &g);
716         if (ret)
717                 return ret;
718
719         geo->heads = g->head;
720         geo->sectors = g->sect;
721         geo->cylinders = g->track;
722
723         return 0;
724 }
725
726 static int floppy_check_change(struct gendisk *disk)
727 {
728         struct floppy_state *fs = disk->private_data;
729
730         return fs->ejected;
731 }
732
733 static int floppy_revalidate(struct gendisk *disk)
734 {
735         struct floppy_state *fs = disk->private_data;
736         struct swim __iomem *base = fs->swd->base;
737
738         swim_drive(base, fs->location);
739
740         if (fs->ejected)
741                 setup_medium(fs);
742
743         if (!fs->disk_in)
744                 swim_motor(base, OFF);
745         else
746                 fs->ejected = 0;
747
748         return !fs->disk_in;
749 }
750
751 static struct block_device_operations floppy_fops = {
752         .owner           = THIS_MODULE,
753         .open            = floppy_open,
754         .release         = floppy_release,
755         .locked_ioctl    = floppy_ioctl,
756         .getgeo          = floppy_getgeo,
757         .media_changed   = floppy_check_change,
758         .revalidate_disk = floppy_revalidate,
759 };
760
761 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
762 {
763         struct swim_priv *swd = data;
764         int drive = (*part & 3);
765
766         if (drive > swd->floppy_count)
767                 return NULL;
768
769         *part = 0;
770         return get_disk(swd->unit[drive].disk);
771 }
772
773 static int __devinit swim_add_floppy(struct swim_priv *swd,
774                                      enum drive_location location)
775 {
776         struct floppy_state *fs = &swd->unit[swd->floppy_count];
777         struct swim __iomem *base = swd->base;
778
779         fs->location = location;
780
781         swim_drive(base, location);
782
783         swim_motor(base, OFF);
784
785         if (swim_readbit(base, SINGLE_SIDED))
786                 fs->head_number = 1;
787         else
788                 fs->head_number = 2;
789         fs->ref_count = 0;
790         fs->ejected = 1;
791
792         swd->floppy_count++;
793
794         return 0;
795 }
796
797 static int __devinit swim_floppy_init(struct swim_priv *swd)
798 {
799         int err;
800         int drive;
801         struct swim __iomem *base = swd->base;
802
803         /* scan floppy drives */
804
805         swim_drive(base, INTERNAL_DRIVE);
806         if (swim_readbit(base, DRIVE_PRESENT))
807                 swim_add_floppy(swd, INTERNAL_DRIVE);
808         swim_drive(base, EXTERNAL_DRIVE);
809         if (swim_readbit(base, DRIVE_PRESENT))
810                 swim_add_floppy(swd, EXTERNAL_DRIVE);
811
812         /* register floppy drives */
813
814         err = register_blkdev(FLOPPY_MAJOR, "fd");
815         if (err) {
816                 printk(KERN_ERR "Unable to get major %d for SWIM floppy\n",
817                        FLOPPY_MAJOR);
818                 return -EBUSY;
819         }
820
821         for (drive = 0; drive < swd->floppy_count; drive++) {
822                 swd->unit[drive].disk = alloc_disk(1);
823                 if (swd->unit[drive].disk == NULL) {
824                         err = -ENOMEM;
825                         goto exit_put_disks;
826                 }
827                 swd->unit[drive].swd = swd;
828         }
829
830         swd->queue = blk_init_queue(do_fd_request, &swd->lock);
831         if (!swd->queue) {
832                 err = -ENOMEM;
833                 goto exit_put_disks;
834         }
835
836         for (drive = 0; drive < swd->floppy_count; drive++) {
837                 swd->unit[drive].disk->flags = GENHD_FL_REMOVABLE;
838                 swd->unit[drive].disk->major = FLOPPY_MAJOR;
839                 swd->unit[drive].disk->first_minor = drive;
840                 sprintf(swd->unit[drive].disk->disk_name, "fd%d", drive);
841                 swd->unit[drive].disk->fops = &floppy_fops;
842                 swd->unit[drive].disk->private_data = &swd->unit[drive];
843                 swd->unit[drive].disk->queue = swd->queue;
844                 set_capacity(swd->unit[drive].disk, 2880);
845                 add_disk(swd->unit[drive].disk);
846         }
847
848         blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
849                             floppy_find, NULL, swd);
850
851         return 0;
852
853 exit_put_disks:
854         unregister_blkdev(FLOPPY_MAJOR, "fd");
855         while (drive--)
856                 put_disk(swd->unit[drive].disk);
857         return err;
858 }
859
860 static int __devinit swim_probe(struct platform_device *dev)
861 {
862         struct resource *res;
863         struct swim __iomem *swim_base;
864         struct swim_priv *swd;
865         int ret;
866
867         res = platform_get_resource_byname(dev, IORESOURCE_MEM, "swim-regs");
868         if (!res) {
869                 ret = -ENODEV;
870                 goto out;
871         }
872
873         if (!request_mem_region(res->start, resource_size(res), CARDNAME)) {
874                 ret = -EBUSY;
875                 goto out;
876         }
877
878         swim_base = ioremap(res->start, resource_size(res));
879         if (!swim_base) {
880                 return -ENOMEM;
881                 goto out_release_io;
882         }
883
884         /* probe device */
885
886         set_swim_mode(swim_base, 1);
887         if (!get_swim_mode(swim_base)) {
888                 printk(KERN_INFO "SWIM device not found !\n");
889                 ret = -ENODEV;
890                 goto out_iounmap;
891         }
892
893         /* set platform driver data */
894
895         swd = kzalloc(sizeof(struct swim_priv), GFP_KERNEL);
896         if (!swd) {
897                 ret = -ENOMEM;
898                 goto out_iounmap;
899         }
900         platform_set_drvdata(dev, swd);
901
902         swd->base = swim_base;
903
904         ret = swim_floppy_init(swd);
905         if (ret)
906                 goto out_kfree;
907
908         return 0;
909
910 out_kfree:
911         platform_set_drvdata(dev, NULL);
912         kfree(swd);
913 out_iounmap:
914         iounmap(swim_base);
915 out_release_io:
916         release_mem_region(res->start, resource_size(res));
917 out:
918         return ret;
919 }
920
921 static int __devexit swim_remove(struct platform_device *dev)
922 {
923         struct swim_priv *swd = platform_get_drvdata(dev);
924         int drive;
925         struct resource *res;
926
927         blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
928
929         for (drive = 0; drive < swd->floppy_count; drive++) {
930                 del_gendisk(swd->unit[drive].disk);
931                 put_disk(swd->unit[drive].disk);
932         }
933
934         unregister_blkdev(FLOPPY_MAJOR, "fd");
935
936         blk_cleanup_queue(swd->queue);
937
938         /* eject floppies */
939
940         for (drive = 0; drive < swd->floppy_count; drive++)
941                 floppy_eject(&swd->unit[drive]);
942
943         iounmap(swd->base);
944
945         res = platform_get_resource_byname(dev, IORESOURCE_MEM, "swim-regs");
946         if (res)
947                 release_mem_region(res->start, resource_size(res));
948
949         platform_set_drvdata(dev, NULL);
950         kfree(swd);
951
952         return 0;
953 }
954
955 static struct platform_driver swim_driver = {
956         .probe  = swim_probe,
957         .remove = __devexit_p(swim_remove),
958         .driver   = {
959                 .name   = CARDNAME,
960                 .owner  = THIS_MODULE,
961         },
962 };
963
964 static int __init swim_init(void)
965 {
966         printk(KERN_INFO "SWIM floppy driver %s\n", DRIVER_VERSION);
967
968         return platform_driver_register(&swim_driver);
969 }
970 module_init(swim_init);
971
972 static void __exit swim_exit(void)
973 {
974         platform_driver_unregister(&swim_driver);
975 }
976 module_exit(swim_exit);
977
978 MODULE_DESCRIPTION("Driver for SWIM floppy controller");
979 MODULE_LICENSE("GPL");
980 MODULE_AUTHOR("Laurent Vivier <laurent@lvivier.info>");
981 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);