treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
[muen/linux.git] / drivers / block / swim.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Driver for SWIM (Sander Woz Integrated Machine) floppy controller
4  *
5  * Copyright (C) 2004,2008 Laurent Vivier <Laurent@lvivier.info>
6  *
7  * based on Alastair Bridgewater SWIM analysis, 2001
8  * based on SWIM3 driver (c) Paul Mackerras, 1996
9  * based on netBSD IWM driver (c) 1997, 1998 Hauke Fath.
10  *
11  * 2004-08-21 (lv) - Initial implementation
12  * 2008-10-30 (lv) - Port to 2.6
13  */
14
15 #include <linux/module.h>
16 #include <linux/fd.h>
17 #include <linux/slab.h>
18 #include <linux/blk-mq.h>
19 #include <linux/mutex.h>
20 #include <linux/hdreg.h>
21 #include <linux/kernel.h>
22 #include <linux/delay.h>
23 #include <linux/platform_device.h>
24
25 #include <asm/mac_via.h>
26
27 #define CARDNAME "swim"
28
29 struct sector_header {
30         unsigned char side;
31         unsigned char track;
32         unsigned char sector;
33         unsigned char size;
34         unsigned char crc0;
35         unsigned char crc1;
36 } __attribute__((packed));
37
38 #define DRIVER_VERSION "Version 0.2 (2008-10-30)"
39
40 #define REG(x)  unsigned char x, x ## _pad[0x200 - 1];
41
42 struct swim {
43         REG(write_data)
44         REG(write_mark)
45         REG(write_CRC)
46         REG(write_parameter)
47         REG(write_phase)
48         REG(write_setup)
49         REG(write_mode0)
50         REG(write_mode1)
51
52         REG(read_data)
53         REG(read_mark)
54         REG(read_error)
55         REG(read_parameter)
56         REG(read_phase)
57         REG(read_setup)
58         REG(read_status)
59         REG(read_handshake)
60 } __attribute__((packed));
61
62 #define swim_write(base, reg, v)        out_8(&(base)->write_##reg, (v))
63 #define swim_read(base, reg)            in_8(&(base)->read_##reg)
64
65 /* IWM registers */
66
67 struct iwm {
68         REG(ph0L)
69         REG(ph0H)
70         REG(ph1L)
71         REG(ph1H)
72         REG(ph2L)
73         REG(ph2H)
74         REG(ph3L)
75         REG(ph3H)
76         REG(mtrOff)
77         REG(mtrOn)
78         REG(intDrive)
79         REG(extDrive)
80         REG(q6L)
81         REG(q6H)
82         REG(q7L)
83         REG(q7H)
84 } __attribute__((packed));
85
86 #define iwm_write(base, reg, v)         out_8(&(base)->reg, (v))
87 #define iwm_read(base, reg)             in_8(&(base)->reg)
88
89 /* bits in phase register */
90
91 #define SEEK_POSITIVE   0x070
92 #define SEEK_NEGATIVE   0x074
93 #define STEP            0x071
94 #define MOTOR_ON        0x072
95 #define MOTOR_OFF       0x076
96 #define INDEX           0x073
97 #define EJECT           0x077
98 #define SETMFM          0x171
99 #define SETGCR          0x175
100
101 #define RELAX           0x033
102 #define LSTRB           0x008
103
104 #define CA_MASK         0x077
105
106 /* Select values for swim_select and swim_readbit */
107
108 #define READ_DATA_0     0x074
109 #define ONEMEG_DRIVE    0x075
110 #define SINGLE_SIDED    0x076
111 #define DRIVE_PRESENT   0x077
112 #define DISK_IN         0x170
113 #define WRITE_PROT      0x171
114 #define TRACK_ZERO      0x172
115 #define TACHO           0x173
116 #define READ_DATA_1     0x174
117 #define GCR_MODE        0x175
118 #define SEEK_COMPLETE   0x176
119 #define TWOMEG_MEDIA    0x177
120
121 /* Bits in handshake register */
122
123 #define MARK_BYTE       0x01
124 #define CRC_ZERO        0x02
125 #define RDDATA          0x04
126 #define SENSE           0x08
127 #define MOTEN           0x10
128 #define ERROR           0x20
129 #define DAT2BYTE        0x40
130 #define DAT1BYTE        0x80
131
132 /* bits in setup register */
133
134 #define S_INV_WDATA     0x01
135 #define S_3_5_SELECT    0x02
136 #define S_GCR           0x04
137 #define S_FCLK_DIV2     0x08
138 #define S_ERROR_CORR    0x10
139 #define S_IBM_DRIVE     0x20
140 #define S_GCR_WRITE     0x40
141 #define S_TIMEOUT       0x80
142
143 /* bits in mode register */
144
145 #define CLFIFO          0x01
146 #define ENBL1           0x02
147 #define ENBL2           0x04
148 #define ACTION          0x08
149 #define WRITE_MODE      0x10
150 #define HEDSEL          0x20
151 #define MOTON           0x80
152
153 /*----------------------------------------------------------------------------*/
154
155 enum drive_location {
156         INTERNAL_DRIVE = 0x02,
157         EXTERNAL_DRIVE = 0x04,
158 };
159
160 enum media_type {
161         DD_MEDIA,
162         HD_MEDIA,
163 };
164
165 struct floppy_state {
166
167         /* physical properties */
168
169         enum drive_location location;   /* internal or external drive */
170         int              head_number;   /* single- or double-sided drive */
171
172         /* media */
173
174         int              disk_in;
175         int              ejected;
176         enum media_type  type;
177         int              write_protected;
178
179         int              total_secs;
180         int              secpercyl;
181         int              secpertrack;
182
183         /* in-use information */
184
185         int             track;
186         int             ref_count;
187
188         struct gendisk *disk;
189         struct blk_mq_tag_set tag_set;
190
191         /* parent controller */
192
193         struct swim_priv *swd;
194 };
195
196 enum motor_action {
197         OFF,
198         ON,
199 };
200
201 enum head {
202         LOWER_HEAD = 0,
203         UPPER_HEAD = 1,
204 };
205
206 #define FD_MAX_UNIT     2
207
208 struct swim_priv {
209         struct swim __iomem *base;
210         spinlock_t lock;
211         int floppy_count;
212         struct floppy_state unit[FD_MAX_UNIT];
213 };
214
215 extern int swim_read_sector_header(struct swim __iomem *base,
216                                    struct sector_header *header);
217 extern int swim_read_sector_data(struct swim __iomem *base,
218                                  unsigned char *data);
219
220 static DEFINE_MUTEX(swim_mutex);
221 static inline void set_swim_mode(struct swim __iomem *base, int enable)
222 {
223         struct iwm __iomem *iwm_base;
224         unsigned long flags;
225
226         if (!enable) {
227                 swim_write(base, mode0, 0xf8);
228                 return;
229         }
230
231         iwm_base = (struct iwm __iomem *)base;
232         local_irq_save(flags);
233
234         iwm_read(iwm_base, q7L);
235         iwm_read(iwm_base, mtrOff);
236         iwm_read(iwm_base, q6H);
237
238         iwm_write(iwm_base, q7H, 0x57);
239         iwm_write(iwm_base, q7H, 0x17);
240         iwm_write(iwm_base, q7H, 0x57);
241         iwm_write(iwm_base, q7H, 0x57);
242
243         local_irq_restore(flags);
244 }
245
246 static inline int get_swim_mode(struct swim __iomem *base)
247 {
248         unsigned long flags;
249
250         local_irq_save(flags);
251
252         swim_write(base, phase, 0xf5);
253         if (swim_read(base, phase) != 0xf5)
254                 goto is_iwm;
255         swim_write(base, phase, 0xf6);
256         if (swim_read(base, phase) != 0xf6)
257                 goto is_iwm;
258         swim_write(base, phase, 0xf7);
259         if (swim_read(base, phase) != 0xf7)
260                 goto is_iwm;
261         local_irq_restore(flags);
262         return 1;
263 is_iwm:
264         local_irq_restore(flags);
265         return 0;
266 }
267
268 static inline void swim_select(struct swim __iomem *base, int sel)
269 {
270         swim_write(base, phase, RELAX);
271
272         via1_set_head(sel & 0x100);
273
274         swim_write(base, phase, sel & CA_MASK);
275 }
276
277 static inline void swim_action(struct swim __iomem *base, int action)
278 {
279         unsigned long flags;
280
281         local_irq_save(flags);
282
283         swim_select(base, action);
284         udelay(1);
285         swim_write(base, phase, (LSTRB<<4) | LSTRB);
286         udelay(1);
287         swim_write(base, phase, (LSTRB<<4) | ((~LSTRB) & 0x0F));
288         udelay(1);
289
290         local_irq_restore(flags);
291 }
292
293 static inline int swim_readbit(struct swim __iomem *base, int bit)
294 {
295         int stat;
296
297         swim_select(base, bit);
298
299         udelay(10);
300
301         stat = swim_read(base, handshake);
302
303         return (stat & SENSE) == 0;
304 }
305
306 static inline void swim_drive(struct swim __iomem *base,
307                               enum drive_location location)
308 {
309         if (location == INTERNAL_DRIVE) {
310                 swim_write(base, mode0, EXTERNAL_DRIVE); /* clear drive 1 bit */
311                 swim_write(base, mode1, INTERNAL_DRIVE); /* set drive 0 bit */
312         } else if (location == EXTERNAL_DRIVE) {
313                 swim_write(base, mode0, INTERNAL_DRIVE); /* clear drive 0 bit */
314                 swim_write(base, mode1, EXTERNAL_DRIVE); /* set drive 1 bit */
315         }
316 }
317
318 static inline void swim_motor(struct swim __iomem *base,
319                               enum motor_action action)
320 {
321         if (action == ON) {
322                 int i;
323
324                 swim_action(base, MOTOR_ON);
325
326                 for (i = 0; i < 2*HZ; i++) {
327                         swim_select(base, RELAX);
328                         if (swim_readbit(base, MOTOR_ON))
329                                 break;
330                         current->state = TASK_INTERRUPTIBLE;
331                         schedule_timeout(1);
332                 }
333         } else if (action == OFF) {
334                 swim_action(base, MOTOR_OFF);
335                 swim_select(base, RELAX);
336         }
337 }
338
339 static inline void swim_eject(struct swim __iomem *base)
340 {
341         int i;
342
343         swim_action(base, EJECT);
344
345         for (i = 0; i < 2*HZ; i++) {
346                 swim_select(base, RELAX);
347                 if (!swim_readbit(base, DISK_IN))
348                         break;
349                 current->state = TASK_INTERRUPTIBLE;
350                 schedule_timeout(1);
351         }
352         swim_select(base, RELAX);
353 }
354
355 static inline void swim_head(struct swim __iomem *base, enum head head)
356 {
357         /* wait drive is ready */
358
359         if (head == UPPER_HEAD)
360                 swim_select(base, READ_DATA_1);
361         else if (head == LOWER_HEAD)
362                 swim_select(base, READ_DATA_0);
363 }
364
365 static inline int swim_step(struct swim __iomem *base)
366 {
367         int wait;
368
369         swim_action(base, STEP);
370
371         for (wait = 0; wait < HZ; wait++) {
372
373                 current->state = TASK_INTERRUPTIBLE;
374                 schedule_timeout(1);
375
376                 swim_select(base, RELAX);
377                 if (!swim_readbit(base, STEP))
378                         return 0;
379         }
380         return -1;
381 }
382
383 static inline int swim_track00(struct swim __iomem *base)
384 {
385         int try;
386
387         swim_action(base, SEEK_NEGATIVE);
388
389         for (try = 0; try < 100; try++) {
390
391                 swim_select(base, RELAX);
392                 if (swim_readbit(base, TRACK_ZERO))
393                         break;
394
395                 if (swim_step(base))
396                         return -1;
397         }
398
399         if (swim_readbit(base, TRACK_ZERO))
400                 return 0;
401
402         return -1;
403 }
404
405 static inline int swim_seek(struct swim __iomem *base, int step)
406 {
407         if (step == 0)
408                 return 0;
409
410         if (step < 0) {
411                 swim_action(base, SEEK_NEGATIVE);
412                 step = -step;
413         } else
414                 swim_action(base, SEEK_POSITIVE);
415
416         for ( ; step > 0; step--) {
417                 if (swim_step(base))
418                         return -1;
419         }
420
421         return 0;
422 }
423
424 static inline int swim_track(struct floppy_state *fs,  int track)
425 {
426         struct swim __iomem *base = fs->swd->base;
427         int ret;
428
429         ret = swim_seek(base, track - fs->track);
430
431         if (ret == 0)
432                 fs->track = track;
433         else {
434                 swim_track00(base);
435                 fs->track = 0;
436         }
437
438         return ret;
439 }
440
441 static int floppy_eject(struct floppy_state *fs)
442 {
443         struct swim __iomem *base = fs->swd->base;
444
445         swim_drive(base, fs->location);
446         swim_motor(base, OFF);
447         swim_eject(base);
448
449         fs->disk_in = 0;
450         fs->ejected = 1;
451
452         return 0;
453 }
454
455 static inline int swim_read_sector(struct floppy_state *fs,
456                                    int side, int track,
457                                    int sector, unsigned char *buffer)
458 {
459         struct swim __iomem *base = fs->swd->base;
460         unsigned long flags;
461         struct sector_header header;
462         int ret = -1;
463         short i;
464
465         swim_track(fs, track);
466
467         swim_write(base, mode1, MOTON);
468         swim_head(base, side);
469         swim_write(base, mode0, side);
470
471         local_irq_save(flags);
472         for (i = 0; i < 36; i++) {
473                 ret = swim_read_sector_header(base, &header);
474                 if (!ret && (header.sector == sector)) {
475                         /* found */
476
477                         ret = swim_read_sector_data(base, buffer);
478                         break;
479                 }
480         }
481         local_irq_restore(flags);
482
483         swim_write(base, mode0, MOTON);
484
485         if ((header.side != side)  || (header.track != track) ||
486              (header.sector != sector))
487                 return 0;
488
489         return ret;
490 }
491
492 static blk_status_t floppy_read_sectors(struct floppy_state *fs,
493                                int req_sector, int sectors_nb,
494                                unsigned char *buffer)
495 {
496         struct swim __iomem *base = fs->swd->base;
497         int ret;
498         int side, track, sector;
499         int i, try;
500
501
502         swim_drive(base, fs->location);
503         for (i = req_sector; i < req_sector + sectors_nb; i++) {
504                 int x;
505                 track = i / fs->secpercyl;
506                 x = i % fs->secpercyl;
507                 side = x / fs->secpertrack;
508                 sector = x % fs->secpertrack + 1;
509
510                 try = 5;
511                 do {
512                         ret = swim_read_sector(fs, side, track, sector,
513                                                 buffer);
514                         if (try-- == 0)
515                                 return BLK_STS_IOERR;
516                 } while (ret != 512);
517
518                 buffer += ret;
519         }
520
521         return 0;
522 }
523
524 static blk_status_t swim_queue_rq(struct blk_mq_hw_ctx *hctx,
525                                   const struct blk_mq_queue_data *bd)
526 {
527         struct floppy_state *fs = hctx->queue->queuedata;
528         struct swim_priv *swd = fs->swd;
529         struct request *req = bd->rq;
530         blk_status_t err;
531
532         if (!spin_trylock_irq(&swd->lock))
533                 return BLK_STS_DEV_RESOURCE;
534
535         blk_mq_start_request(req);
536
537         if (!fs->disk_in || rq_data_dir(req) == WRITE) {
538                 err = BLK_STS_IOERR;
539                 goto out;
540         }
541
542         do {
543                 err = floppy_read_sectors(fs, blk_rq_pos(req),
544                                           blk_rq_cur_sectors(req),
545                                           bio_data(req->bio));
546         } while (blk_update_request(req, err, blk_rq_cur_bytes(req)));
547         __blk_mq_end_request(req, err);
548
549         err = BLK_STS_OK;
550 out:
551         spin_unlock_irq(&swd->lock);
552         return err;
553
554 }
555
556 static struct floppy_struct floppy_type[4] = {
557         {    0,  0, 0,  0, 0, 0x00, 0x00, 0x00, 0x00, NULL }, /* no testing   */
558         {  720,  9, 1, 80, 0, 0x2A, 0x02, 0xDF, 0x50, NULL }, /* 360KB SS 3.5"*/
559         { 1440,  9, 2, 80, 0, 0x2A, 0x02, 0xDF, 0x50, NULL }, /* 720KB 3.5"   */
560         { 2880, 18, 2, 80, 0, 0x1B, 0x00, 0xCF, 0x6C, NULL }, /* 1.44MB 3.5"  */
561 };
562
563 static int get_floppy_geometry(struct floppy_state *fs, int type,
564                                struct floppy_struct **g)
565 {
566         if (type >= ARRAY_SIZE(floppy_type))
567                 return -EINVAL;
568
569         if (type)
570                 *g = &floppy_type[type];
571         else if (fs->type == HD_MEDIA) /* High-Density media */
572                 *g = &floppy_type[3];
573         else if (fs->head_number == 2) /* double-sided */
574                 *g = &floppy_type[2];
575         else
576                 *g = &floppy_type[1];
577
578         return 0;
579 }
580
581 static void setup_medium(struct floppy_state *fs)
582 {
583         struct swim __iomem *base = fs->swd->base;
584
585         if (swim_readbit(base, DISK_IN)) {
586                 struct floppy_struct *g;
587                 fs->disk_in = 1;
588                 fs->write_protected = swim_readbit(base, WRITE_PROT);
589
590                 if (swim_track00(base))
591                         printk(KERN_ERR
592                                 "SWIM: cannot move floppy head to track 0\n");
593
594                 swim_track00(base);
595
596                 fs->type = swim_readbit(base, TWOMEG_MEDIA) ?
597                         HD_MEDIA : DD_MEDIA;
598                 fs->head_number = swim_readbit(base, SINGLE_SIDED) ? 1 : 2;
599                 get_floppy_geometry(fs, 0, &g);
600                 fs->total_secs = g->size;
601                 fs->secpercyl = g->head * g->sect;
602                 fs->secpertrack = g->sect;
603                 fs->track = 0;
604         } else {
605                 fs->disk_in = 0;
606         }
607 }
608
609 static int floppy_open(struct block_device *bdev, fmode_t mode)
610 {
611         struct floppy_state *fs = bdev->bd_disk->private_data;
612         struct swim __iomem *base = fs->swd->base;
613         int err;
614
615         if (fs->ref_count == -1 || (fs->ref_count && mode & FMODE_EXCL))
616                 return -EBUSY;
617
618         if (mode & FMODE_EXCL)
619                 fs->ref_count = -1;
620         else
621                 fs->ref_count++;
622
623         swim_write(base, setup, S_IBM_DRIVE  | S_FCLK_DIV2);
624         udelay(10);
625         swim_drive(base, fs->location);
626         swim_motor(base, ON);
627         swim_action(base, SETMFM);
628         if (fs->ejected)
629                 setup_medium(fs);
630         if (!fs->disk_in) {
631                 err = -ENXIO;
632                 goto out;
633         }
634
635         set_capacity(fs->disk, fs->total_secs);
636
637         if (mode & FMODE_NDELAY)
638                 return 0;
639
640         if (mode & (FMODE_READ|FMODE_WRITE)) {
641                 check_disk_change(bdev);
642                 if ((mode & FMODE_WRITE) && fs->write_protected) {
643                         err = -EROFS;
644                         goto out;
645                 }
646         }
647         return 0;
648 out:
649         if (fs->ref_count < 0)
650                 fs->ref_count = 0;
651         else if (fs->ref_count > 0)
652                 --fs->ref_count;
653
654         if (fs->ref_count == 0)
655                 swim_motor(base, OFF);
656         return err;
657 }
658
659 static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
660 {
661         int ret;
662
663         mutex_lock(&swim_mutex);
664         ret = floppy_open(bdev, mode);
665         mutex_unlock(&swim_mutex);
666
667         return ret;
668 }
669
670 static void floppy_release(struct gendisk *disk, fmode_t mode)
671 {
672         struct floppy_state *fs = disk->private_data;
673         struct swim __iomem *base = fs->swd->base;
674
675         mutex_lock(&swim_mutex);
676         if (fs->ref_count < 0)
677                 fs->ref_count = 0;
678         else if (fs->ref_count > 0)
679                 --fs->ref_count;
680
681         if (fs->ref_count == 0)
682                 swim_motor(base, OFF);
683         mutex_unlock(&swim_mutex);
684 }
685
686 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
687                         unsigned int cmd, unsigned long param)
688 {
689         struct floppy_state *fs = bdev->bd_disk->private_data;
690         int err;
691
692         if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
693                         return -EPERM;
694
695         switch (cmd) {
696         case FDEJECT:
697                 if (fs->ref_count != 1)
698                         return -EBUSY;
699                 mutex_lock(&swim_mutex);
700                 err = floppy_eject(fs);
701                 mutex_unlock(&swim_mutex);
702                 return err;
703
704         case FDGETPRM:
705                 if (copy_to_user((void __user *) param, (void *) &floppy_type,
706                                  sizeof(struct floppy_struct)))
707                         return -EFAULT;
708                 return 0;
709         }
710         return -ENOTTY;
711 }
712
713 static int floppy_getgeo(struct block_device *bdev, struct hd_geometry *geo)
714 {
715         struct floppy_state *fs = bdev->bd_disk->private_data;
716         struct floppy_struct *g;
717         int ret;
718
719         ret = get_floppy_geometry(fs, 0, &g);
720         if (ret)
721                 return ret;
722
723         geo->heads = g->head;
724         geo->sectors = g->sect;
725         geo->cylinders = g->track;
726
727         return 0;
728 }
729
730 static unsigned int floppy_check_events(struct gendisk *disk,
731                                         unsigned int clearing)
732 {
733         struct floppy_state *fs = disk->private_data;
734
735         return fs->ejected ? DISK_EVENT_MEDIA_CHANGE : 0;
736 }
737
738 static int floppy_revalidate(struct gendisk *disk)
739 {
740         struct floppy_state *fs = disk->private_data;
741         struct swim __iomem *base = fs->swd->base;
742
743         swim_drive(base, fs->location);
744
745         if (fs->ejected)
746                 setup_medium(fs);
747
748         if (!fs->disk_in)
749                 swim_motor(base, OFF);
750         else
751                 fs->ejected = 0;
752
753         return !fs->disk_in;
754 }
755
756 static const struct block_device_operations floppy_fops = {
757         .owner           = THIS_MODULE,
758         .open            = floppy_unlocked_open,
759         .release         = floppy_release,
760         .ioctl           = floppy_ioctl,
761         .getgeo          = floppy_getgeo,
762         .check_events    = floppy_check_events,
763         .revalidate_disk = floppy_revalidate,
764 };
765
766 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
767 {
768         struct swim_priv *swd = data;
769         int drive = (*part & 3);
770
771         if (drive >= swd->floppy_count)
772                 return NULL;
773
774         *part = 0;
775         return get_disk_and_module(swd->unit[drive].disk);
776 }
777
778 static int swim_add_floppy(struct swim_priv *swd, enum drive_location location)
779 {
780         struct floppy_state *fs = &swd->unit[swd->floppy_count];
781         struct swim __iomem *base = swd->base;
782
783         fs->location = location;
784
785         swim_drive(base, location);
786
787         swim_motor(base, OFF);
788
789         fs->type = HD_MEDIA;
790         fs->head_number = 2;
791
792         fs->ref_count = 0;
793         fs->ejected = 1;
794
795         swd->floppy_count++;
796
797         return 0;
798 }
799
800 static const struct blk_mq_ops swim_mq_ops = {
801         .queue_rq = swim_queue_rq,
802 };
803
804 static int swim_floppy_init(struct swim_priv *swd)
805 {
806         int err;
807         int drive;
808         struct swim __iomem *base = swd->base;
809
810         /* scan floppy drives */
811
812         swim_drive(base, INTERNAL_DRIVE);
813         if (swim_readbit(base, DRIVE_PRESENT) &&
814             !swim_readbit(base, ONEMEG_DRIVE))
815                 swim_add_floppy(swd, INTERNAL_DRIVE);
816         swim_drive(base, EXTERNAL_DRIVE);
817         if (swim_readbit(base, DRIVE_PRESENT) &&
818             !swim_readbit(base, ONEMEG_DRIVE))
819                 swim_add_floppy(swd, EXTERNAL_DRIVE);
820
821         /* register floppy drives */
822
823         err = register_blkdev(FLOPPY_MAJOR, "fd");
824         if (err) {
825                 printk(KERN_ERR "Unable to get major %d for SWIM floppy\n",
826                        FLOPPY_MAJOR);
827                 return -EBUSY;
828         }
829
830         spin_lock_init(&swd->lock);
831
832         for (drive = 0; drive < swd->floppy_count; drive++) {
833                 struct request_queue *q;
834
835                 swd->unit[drive].disk = alloc_disk(1);
836                 if (swd->unit[drive].disk == NULL) {
837                         err = -ENOMEM;
838                         goto exit_put_disks;
839                 }
840
841                 q = blk_mq_init_sq_queue(&swd->unit[drive].tag_set, &swim_mq_ops,
842                                                 2, BLK_MQ_F_SHOULD_MERGE);
843                 if (IS_ERR(q)) {
844                         err = PTR_ERR(q);
845                         goto exit_put_disks;
846                 }
847
848                 swd->unit[drive].disk->queue = q;
849                 blk_queue_bounce_limit(swd->unit[drive].disk->queue,
850                                 BLK_BOUNCE_HIGH);
851                 swd->unit[drive].disk->queue->queuedata = &swd->unit[drive];
852                 swd->unit[drive].swd = swd;
853         }
854
855         for (drive = 0; drive < swd->floppy_count; drive++) {
856                 swd->unit[drive].disk->flags = GENHD_FL_REMOVABLE;
857                 swd->unit[drive].disk->major = FLOPPY_MAJOR;
858                 swd->unit[drive].disk->first_minor = drive;
859                 sprintf(swd->unit[drive].disk->disk_name, "fd%d", drive);
860                 swd->unit[drive].disk->fops = &floppy_fops;
861                 swd->unit[drive].disk->events = DISK_EVENT_MEDIA_CHANGE;
862                 swd->unit[drive].disk->private_data = &swd->unit[drive];
863                 set_capacity(swd->unit[drive].disk, 2880);
864                 add_disk(swd->unit[drive].disk);
865         }
866
867         blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
868                             floppy_find, NULL, swd);
869
870         return 0;
871
872 exit_put_disks:
873         unregister_blkdev(FLOPPY_MAJOR, "fd");
874         do {
875                 struct gendisk *disk = swd->unit[drive].disk;
876
877                 if (disk) {
878                         if (disk->queue) {
879                                 blk_cleanup_queue(disk->queue);
880                                 disk->queue = NULL;
881                         }
882                         blk_mq_free_tag_set(&swd->unit[drive].tag_set);
883                         put_disk(disk);
884                 }
885         } while (drive--);
886         return err;
887 }
888
889 static int swim_probe(struct platform_device *dev)
890 {
891         struct resource *res;
892         struct swim __iomem *swim_base;
893         struct swim_priv *swd;
894         int ret;
895
896         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
897         if (!res) {
898                 ret = -ENODEV;
899                 goto out;
900         }
901
902         if (!request_mem_region(res->start, resource_size(res), CARDNAME)) {
903                 ret = -EBUSY;
904                 goto out;
905         }
906
907         swim_base = (struct swim __iomem *)res->start;
908         if (!swim_base) {
909                 ret = -ENOMEM;
910                 goto out_release_io;
911         }
912
913         /* probe device */
914
915         set_swim_mode(swim_base, 1);
916         if (!get_swim_mode(swim_base)) {
917                 printk(KERN_INFO "SWIM device not found !\n");
918                 ret = -ENODEV;
919                 goto out_release_io;
920         }
921
922         /* set platform driver data */
923
924         swd = kzalloc(sizeof(struct swim_priv), GFP_KERNEL);
925         if (!swd) {
926                 ret = -ENOMEM;
927                 goto out_release_io;
928         }
929         platform_set_drvdata(dev, swd);
930
931         swd->base = swim_base;
932
933         ret = swim_floppy_init(swd);
934         if (ret)
935                 goto out_kfree;
936
937         return 0;
938
939 out_kfree:
940         kfree(swd);
941 out_release_io:
942         release_mem_region(res->start, resource_size(res));
943 out:
944         return ret;
945 }
946
947 static int swim_remove(struct platform_device *dev)
948 {
949         struct swim_priv *swd = platform_get_drvdata(dev);
950         int drive;
951         struct resource *res;
952
953         blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
954
955         for (drive = 0; drive < swd->floppy_count; drive++) {
956                 del_gendisk(swd->unit[drive].disk);
957                 blk_cleanup_queue(swd->unit[drive].disk->queue);
958                 blk_mq_free_tag_set(&swd->unit[drive].tag_set);
959                 put_disk(swd->unit[drive].disk);
960         }
961
962         unregister_blkdev(FLOPPY_MAJOR, "fd");
963
964         /* eject floppies */
965
966         for (drive = 0; drive < swd->floppy_count; drive++)
967                 floppy_eject(&swd->unit[drive]);
968
969         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
970         if (res)
971                 release_mem_region(res->start, resource_size(res));
972
973         kfree(swd);
974
975         return 0;
976 }
977
978 static struct platform_driver swim_driver = {
979         .probe  = swim_probe,
980         .remove = swim_remove,
981         .driver   = {
982                 .name   = CARDNAME,
983         },
984 };
985
986 static int __init swim_init(void)
987 {
988         printk(KERN_INFO "SWIM floppy driver %s\n", DRIVER_VERSION);
989
990         return platform_driver_register(&swim_driver);
991 }
992 module_init(swim_init);
993
994 static void __exit swim_exit(void)
995 {
996         platform_driver_unregister(&swim_driver);
997 }
998 module_exit(swim_exit);
999
1000 MODULE_DESCRIPTION("Driver for SWIM floppy controller");
1001 MODULE_LICENSE("GPL");
1002 MODULE_AUTHOR("Laurent Vivier <laurent@lvivier.info>");
1003 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);