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/major.h>
20 #include <linux/mutex.h>
21 #include <linux/hdreg.h>
22 #include <linux/kernel.h>
23 #include <linux/delay.h>
24 #include <linux/platform_device.h>
25
26 #include <asm/mac_via.h>
27
28 #define CARDNAME "swim"
29
30 struct sector_header {
31 unsigned char side;
32 unsigned char track;
33 unsigned char sector;
34 unsigned char size;
35 unsigned char crc0;
36 unsigned char crc1;
37 } __attribute__((packed));
38
39 #define DRIVER_VERSION "Version 0.2 (2008-10-30)"
40
41 #define REG(x) unsigned char x, x ## _pad[0x200 - 1];
42
43 struct swim {
44 REG(write_data)
45 REG(write_mark)
46 REG(write_CRC)
47 REG(write_parameter)
48 REG(write_phase)
49 REG(write_setup)
50 REG(write_mode0)
51 REG(write_mode1)
52
53 REG(read_data)
54 REG(read_mark)
55 REG(read_error)
56 REG(read_parameter)
57 REG(read_phase)
58 REG(read_setup)
59 REG(read_status)
60 REG(read_handshake)
61 } __attribute__((packed));
62
63 #define swim_write(base, reg, v) out_8(&(base)->write_##reg, (v))
64 #define swim_read(base, reg) in_8(&(base)->read_##reg)
65
66 /* IWM registers */
67
68 struct iwm {
69 REG(ph0L)
70 REG(ph0H)
71 REG(ph1L)
72 REG(ph1H)
73 REG(ph2L)
74 REG(ph2H)
75 REG(ph3L)
76 REG(ph3H)
77 REG(mtrOff)
78 REG(mtrOn)
79 REG(intDrive)
80 REG(extDrive)
81 REG(q6L)
82 REG(q6H)
83 REG(q7L)
84 REG(q7H)
85 } __attribute__((packed));
86
87 #define iwm_write(base, reg, v) out_8(&(base)->reg, (v))
88 #define iwm_read(base, reg) in_8(&(base)->reg)
89
90 /* bits in phase register */
91
92 #define SEEK_POSITIVE 0x070
93 #define SEEK_NEGATIVE 0x074
94 #define STEP 0x071
95 #define MOTOR_ON 0x072
96 #define MOTOR_OFF 0x076
97 #define INDEX 0x073
98 #define EJECT 0x077
99 #define SETMFM 0x171
100 #define SETGCR 0x175
101
102 #define RELAX 0x033
103 #define LSTRB 0x008
104
105 #define CA_MASK 0x077
106
107 /* Select values for swim_select and swim_readbit */
108
109 #define READ_DATA_0 0x074
110 #define ONEMEG_DRIVE 0x075
111 #define SINGLE_SIDED 0x076
112 #define DRIVE_PRESENT 0x077
113 #define DISK_IN 0x170
114 #define WRITE_PROT 0x171
115 #define TRACK_ZERO 0x172
116 #define TACHO 0x173
117 #define READ_DATA_1 0x174
118 #define GCR_MODE 0x175
119 #define SEEK_COMPLETE 0x176
120 #define TWOMEG_MEDIA 0x177
121
122 /* Bits in handshake register */
123
124 #define MARK_BYTE 0x01
125 #define CRC_ZERO 0x02
126 #define RDDATA 0x04
127 #define SENSE 0x08
128 #define MOTEN 0x10
129 #define ERROR 0x20
130 #define DAT2BYTE 0x40
131 #define DAT1BYTE 0x80
132
133 /* bits in setup register */
134
135 #define S_INV_WDATA 0x01
136 #define S_3_5_SELECT 0x02
137 #define S_GCR 0x04
138 #define S_FCLK_DIV2 0x08
139 #define S_ERROR_CORR 0x10
140 #define S_IBM_DRIVE 0x20
141 #define S_GCR_WRITE 0x40
142 #define S_TIMEOUT 0x80
143
144 /* bits in mode register */
145
146 #define CLFIFO 0x01
147 #define ENBL1 0x02
148 #define ENBL2 0x04
149 #define ACTION 0x08
150 #define WRITE_MODE 0x10
151 #define HEDSEL 0x20
152 #define MOTON 0x80
153
154 /*----------------------------------------------------------------------------*/
155
156 enum drive_location {
157 INTERNAL_DRIVE = 0x02,
158 EXTERNAL_DRIVE = 0x04,
159 };
160
161 enum media_type {
162 DD_MEDIA,
163 HD_MEDIA,
164 };
165
166 struct floppy_state {
167
168 /* physical properties */
169
170 enum drive_location location; /* internal or external drive */
171 int head_number; /* single- or double-sided drive */
172
173 /* media */
174
175 int disk_in;
176 int ejected;
177 enum media_type type;
178 int write_protected;
179
180 int total_secs;
181 int secpercyl;
182 int secpertrack;
183
184 /* in-use information */
185
186 int track;
187 int ref_count;
188 bool registered;
189
190 struct gendisk *disk;
191 struct blk_mq_tag_set tag_set;
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 int floppy_count;
214 struct floppy_state unit[FD_MAX_UNIT];
215 };
216
217 extern int swim_read_sector_header(struct swim __iomem *base,
218 struct sector_header *header);
219 extern int swim_read_sector_data(struct swim __iomem *base,
220 unsigned char *data);
221
222 static DEFINE_MUTEX(swim_mutex);
set_swim_mode(struct swim __iomem * base,int enable)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
get_swim_mode(struct swim __iomem * base)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
swim_select(struct swim __iomem * base,int sel)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
swim_action(struct swim __iomem * base,int action)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
swim_readbit(struct swim __iomem * base,int bit)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
swim_drive(struct swim __iomem * base,enum drive_location location)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
swim_motor(struct swim __iomem * base,enum motor_action action)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 set_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
swim_eject(struct swim __iomem * base)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 set_current_state(TASK_INTERRUPTIBLE);
352 schedule_timeout(1);
353 }
354 swim_select(base, RELAX);
355 }
356
swim_head(struct swim __iomem * base,enum head head)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
swim_step(struct swim __iomem * base)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 set_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
swim_track00(struct swim __iomem * base)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
swim_seek(struct swim __iomem * base,int step)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
swim_track(struct floppy_state * fs,int track)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
floppy_eject(struct floppy_state * fs)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
swim_read_sector(struct floppy_state * fs,int side,int track,int sector,unsigned char * buffer)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
floppy_read_sectors(struct floppy_state * fs,int req_sector,int sectors_nb,unsigned char * buffer)494 static blk_status_t 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 BLK_STS_IOERR;
518 } while (ret != 512);
519
520 buffer += ret;
521 }
522
523 return 0;
524 }
525
swim_queue_rq(struct blk_mq_hw_ctx * hctx,const struct blk_mq_queue_data * bd)526 static blk_status_t swim_queue_rq(struct blk_mq_hw_ctx *hctx,
527 const struct blk_mq_queue_data *bd)
528 {
529 struct floppy_state *fs = hctx->queue->queuedata;
530 struct swim_priv *swd = fs->swd;
531 struct request *req = bd->rq;
532 blk_status_t err;
533
534 if (!spin_trylock_irq(&swd->lock))
535 return BLK_STS_DEV_RESOURCE;
536
537 blk_mq_start_request(req);
538
539 if (!fs->disk_in || rq_data_dir(req) == WRITE) {
540 err = BLK_STS_IOERR;
541 goto out;
542 }
543
544 do {
545 err = floppy_read_sectors(fs, blk_rq_pos(req),
546 blk_rq_cur_sectors(req),
547 bio_data(req->bio));
548 } while (blk_update_request(req, err, blk_rq_cur_bytes(req)));
549 __blk_mq_end_request(req, err);
550
551 err = BLK_STS_OK;
552 out:
553 spin_unlock_irq(&swd->lock);
554 return err;
555
556 }
557
558 static struct floppy_struct floppy_type[4] = {
559 { 0, 0, 0, 0, 0, 0x00, 0x00, 0x00, 0x00, NULL }, /* no testing */
560 { 720, 9, 1, 80, 0, 0x2A, 0x02, 0xDF, 0x50, NULL }, /* 360KB SS 3.5"*/
561 { 1440, 9, 2, 80, 0, 0x2A, 0x02, 0xDF, 0x50, NULL }, /* 720KB 3.5" */
562 { 2880, 18, 2, 80, 0, 0x1B, 0x00, 0xCF, 0x6C, NULL }, /* 1.44MB 3.5" */
563 };
564
get_floppy_geometry(struct floppy_state * fs,int type,struct floppy_struct ** g)565 static int get_floppy_geometry(struct floppy_state *fs, int type,
566 struct floppy_struct **g)
567 {
568 if (type >= ARRAY_SIZE(floppy_type))
569 return -EINVAL;
570
571 if (type)
572 *g = &floppy_type[type];
573 else if (fs->type == HD_MEDIA) /* High-Density media */
574 *g = &floppy_type[3];
575 else if (fs->head_number == 2) /* double-sided */
576 *g = &floppy_type[2];
577 else
578 *g = &floppy_type[1];
579
580 return 0;
581 }
582
setup_medium(struct floppy_state * fs)583 static void setup_medium(struct floppy_state *fs)
584 {
585 struct swim __iomem *base = fs->swd->base;
586
587 if (swim_readbit(base, DISK_IN)) {
588 struct floppy_struct *g;
589 fs->disk_in = 1;
590 fs->write_protected = swim_readbit(base, WRITE_PROT);
591
592 if (swim_track00(base))
593 printk(KERN_ERR
594 "SWIM: cannot move floppy head to track 0\n");
595
596 swim_track00(base);
597
598 fs->type = swim_readbit(base, TWOMEG_MEDIA) ?
599 HD_MEDIA : DD_MEDIA;
600 fs->head_number = swim_readbit(base, SINGLE_SIDED) ? 1 : 2;
601 get_floppy_geometry(fs, 0, &g);
602 fs->total_secs = g->size;
603 fs->secpercyl = g->head * g->sect;
604 fs->secpertrack = g->sect;
605 fs->track = 0;
606 } else {
607 fs->disk_in = 0;
608 }
609 }
610
floppy_open(struct gendisk * disk,blk_mode_t mode)611 static int floppy_open(struct gendisk *disk, blk_mode_t mode)
612 {
613 struct floppy_state *fs = disk->private_data;
614 struct swim __iomem *base = fs->swd->base;
615 int err;
616
617 if (fs->ref_count == -1 || (fs->ref_count && mode & BLK_OPEN_EXCL))
618 return -EBUSY;
619 if (mode & BLK_OPEN_EXCL)
620 fs->ref_count = -1;
621 else
622 fs->ref_count++;
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 & BLK_OPEN_NDELAY)
638 return 0;
639
640 if (mode & (BLK_OPEN_READ | BLK_OPEN_WRITE)) {
641 if (disk_check_media_change(disk) && fs->disk_in)
642 fs->ejected = 0;
643 if ((mode & BLK_OPEN_WRITE) && fs->write_protected) {
644 err = -EROFS;
645 goto out;
646 }
647 }
648 return 0;
649 out:
650 if (fs->ref_count < 0)
651 fs->ref_count = 0;
652 else if (fs->ref_count > 0)
653 --fs->ref_count;
654
655 if (fs->ref_count == 0)
656 swim_motor(base, OFF);
657 return err;
658 }
659
floppy_unlocked_open(struct gendisk * disk,blk_mode_t mode)660 static int floppy_unlocked_open(struct gendisk *disk, blk_mode_t mode)
661 {
662 int ret;
663
664 mutex_lock(&swim_mutex);
665 ret = floppy_open(disk, mode);
666 mutex_unlock(&swim_mutex);
667
668 return ret;
669 }
670
floppy_release(struct gendisk * disk)671 static void floppy_release(struct gendisk *disk)
672 {
673 struct floppy_state *fs = disk->private_data;
674 struct swim __iomem *base = fs->swd->base;
675
676 mutex_lock(&swim_mutex);
677 if (fs->ref_count < 0)
678 fs->ref_count = 0;
679 else if (fs->ref_count > 0)
680 --fs->ref_count;
681
682 if (fs->ref_count == 0)
683 swim_motor(base, OFF);
684 mutex_unlock(&swim_mutex);
685 }
686
floppy_ioctl(struct block_device * bdev,blk_mode_t mode,unsigned int cmd,unsigned long param)687 static int floppy_ioctl(struct block_device *bdev, blk_mode_t mode,
688 unsigned int cmd, unsigned long param)
689 {
690 struct floppy_state *fs = bdev->bd_disk->private_data;
691 int err;
692
693 if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
694 return -EPERM;
695
696 switch (cmd) {
697 case FDEJECT:
698 if (fs->ref_count != 1)
699 return -EBUSY;
700 mutex_lock(&swim_mutex);
701 err = floppy_eject(fs);
702 mutex_unlock(&swim_mutex);
703 return err;
704
705 case FDGETPRM:
706 if (copy_to_user((void __user *) param, (void *) &floppy_type,
707 sizeof(struct floppy_struct)))
708 return -EFAULT;
709 return 0;
710 }
711 return -ENOTTY;
712 }
713
floppy_getgeo(struct block_device * bdev,struct hd_geometry * geo)714 static int floppy_getgeo(struct block_device *bdev, struct hd_geometry *geo)
715 {
716 struct floppy_state *fs = bdev->bd_disk->private_data;
717 struct floppy_struct *g;
718 int ret;
719
720 ret = get_floppy_geometry(fs, 0, &g);
721 if (ret)
722 return ret;
723
724 geo->heads = g->head;
725 geo->sectors = g->sect;
726 geo->cylinders = g->track;
727
728 return 0;
729 }
730
floppy_check_events(struct gendisk * disk,unsigned int clearing)731 static unsigned int floppy_check_events(struct gendisk *disk,
732 unsigned int clearing)
733 {
734 struct floppy_state *fs = disk->private_data;
735
736 return fs->ejected ? DISK_EVENT_MEDIA_CHANGE : 0;
737 }
738
739 static const struct block_device_operations floppy_fops = {
740 .owner = THIS_MODULE,
741 .open = floppy_unlocked_open,
742 .release = floppy_release,
743 .ioctl = floppy_ioctl,
744 .getgeo = floppy_getgeo,
745 .check_events = floppy_check_events,
746 };
747
swim_add_floppy(struct swim_priv * swd,enum drive_location location)748 static int swim_add_floppy(struct swim_priv *swd, enum drive_location location)
749 {
750 struct floppy_state *fs = &swd->unit[swd->floppy_count];
751 struct swim __iomem *base = swd->base;
752
753 fs->location = location;
754
755 swim_drive(base, location);
756
757 swim_motor(base, OFF);
758
759 fs->type = HD_MEDIA;
760 fs->head_number = 2;
761
762 fs->ref_count = 0;
763 fs->ejected = 1;
764
765 swd->floppy_count++;
766
767 return 0;
768 }
769
770 static const struct blk_mq_ops swim_mq_ops = {
771 .queue_rq = swim_queue_rq,
772 };
773
swim_cleanup_floppy_disk(struct floppy_state * fs)774 static void swim_cleanup_floppy_disk(struct floppy_state *fs)
775 {
776 struct gendisk *disk = fs->disk;
777
778 if (!disk)
779 return;
780
781 if (fs->registered)
782 del_gendisk(fs->disk);
783
784 put_disk(disk);
785 blk_mq_free_tag_set(&fs->tag_set);
786 }
787
swim_floppy_init(struct swim_priv * swd)788 static int swim_floppy_init(struct swim_priv *swd)
789 {
790 int err;
791 int drive;
792 struct swim __iomem *base = swd->base;
793
794 /* scan floppy drives */
795
796 swim_drive(base, INTERNAL_DRIVE);
797 if (swim_readbit(base, DRIVE_PRESENT) &&
798 !swim_readbit(base, ONEMEG_DRIVE))
799 swim_add_floppy(swd, INTERNAL_DRIVE);
800 swim_drive(base, EXTERNAL_DRIVE);
801 if (swim_readbit(base, DRIVE_PRESENT) &&
802 !swim_readbit(base, ONEMEG_DRIVE))
803 swim_add_floppy(swd, EXTERNAL_DRIVE);
804
805 /* register floppy drives */
806
807 err = register_blkdev(FLOPPY_MAJOR, "fd");
808 if (err) {
809 printk(KERN_ERR "Unable to get major %d for SWIM floppy\n",
810 FLOPPY_MAJOR);
811 return -EBUSY;
812 }
813
814 spin_lock_init(&swd->lock);
815
816 for (drive = 0; drive < swd->floppy_count; drive++) {
817 err = blk_mq_alloc_sq_tag_set(&swd->unit[drive].tag_set,
818 &swim_mq_ops, 2, BLK_MQ_F_SHOULD_MERGE);
819 if (err)
820 goto exit_put_disks;
821
822 swd->unit[drive].disk =
823 blk_mq_alloc_disk(&swd->unit[drive].tag_set, NULL,
824 &swd->unit[drive]);
825 if (IS_ERR(swd->unit[drive].disk)) {
826 blk_mq_free_tag_set(&swd->unit[drive].tag_set);
827 err = PTR_ERR(swd->unit[drive].disk);
828 goto exit_put_disks;
829 }
830
831 swd->unit[drive].swd = swd;
832 }
833
834 for (drive = 0; drive < swd->floppy_count; drive++) {
835 swd->unit[drive].disk->flags = GENHD_FL_REMOVABLE;
836 swd->unit[drive].disk->major = FLOPPY_MAJOR;
837 swd->unit[drive].disk->first_minor = drive;
838 swd->unit[drive].disk->minors = 1;
839 sprintf(swd->unit[drive].disk->disk_name, "fd%d", drive);
840 swd->unit[drive].disk->fops = &floppy_fops;
841 swd->unit[drive].disk->flags |= GENHD_FL_NO_PART;
842 swd->unit[drive].disk->events = DISK_EVENT_MEDIA_CHANGE;
843 swd->unit[drive].disk->private_data = &swd->unit[drive];
844 set_capacity(swd->unit[drive].disk, 2880);
845 err = add_disk(swd->unit[drive].disk);
846 if (err)
847 goto exit_put_disks;
848 swd->unit[drive].registered = true;
849 }
850
851 return 0;
852
853 exit_put_disks:
854 unregister_blkdev(FLOPPY_MAJOR, "fd");
855 do {
856 swim_cleanup_floppy_disk(&swd->unit[drive]);
857 } while (drive--);
858 return err;
859 }
860
swim_probe(struct platform_device * dev)861 static int swim_probe(struct platform_device *dev)
862 {
863 struct resource *res;
864 struct swim __iomem *swim_base;
865 struct swim_priv *swd;
866 int ret;
867
868 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
869 if (!res) {
870 ret = -ENODEV;
871 goto out;
872 }
873
874 if (!request_mem_region(res->start, resource_size(res), CARDNAME)) {
875 ret = -EBUSY;
876 goto out;
877 }
878
879 swim_base = (struct swim __iomem *)res->start;
880 if (!swim_base) {
881 ret = -ENOMEM;
882 goto out_release_io;
883 }
884
885 /* probe device */
886
887 set_swim_mode(swim_base, 1);
888 if (!get_swim_mode(swim_base)) {
889 printk(KERN_INFO "SWIM device not found !\n");
890 ret = -ENODEV;
891 goto out_release_io;
892 }
893
894 /* set platform driver data */
895
896 swd = kzalloc(sizeof(struct swim_priv), GFP_KERNEL);
897 if (!swd) {
898 ret = -ENOMEM;
899 goto out_release_io;
900 }
901 platform_set_drvdata(dev, swd);
902
903 swd->base = swim_base;
904
905 ret = swim_floppy_init(swd);
906 if (ret)
907 goto out_kfree;
908
909 return 0;
910
911 out_kfree:
912 kfree(swd);
913 out_release_io:
914 release_mem_region(res->start, resource_size(res));
915 out:
916 return ret;
917 }
918
swim_remove(struct platform_device * dev)919 static void swim_remove(struct platform_device *dev)
920 {
921 struct swim_priv *swd = platform_get_drvdata(dev);
922 int drive;
923 struct resource *res;
924
925 for (drive = 0; drive < swd->floppy_count; drive++)
926 swim_cleanup_floppy_disk(&swd->unit[drive]);
927
928 unregister_blkdev(FLOPPY_MAJOR, "fd");
929
930 /* eject floppies */
931
932 for (drive = 0; drive < swd->floppy_count; drive++)
933 floppy_eject(&swd->unit[drive]);
934
935 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
936 if (res)
937 release_mem_region(res->start, resource_size(res));
938
939 kfree(swd);
940 }
941
942 static struct platform_driver swim_driver = {
943 .probe = swim_probe,
944 .remove_new = swim_remove,
945 .driver = {
946 .name = CARDNAME,
947 },
948 };
949
swim_init(void)950 static int __init swim_init(void)
951 {
952 printk(KERN_INFO "SWIM floppy driver %s\n", DRIVER_VERSION);
953
954 return platform_driver_register(&swim_driver);
955 }
956 module_init(swim_init);
957
swim_exit(void)958 static void __exit swim_exit(void)
959 {
960 platform_driver_unregister(&swim_driver);
961 }
962 module_exit(swim_exit);
963
964 MODULE_DESCRIPTION("Driver for SWIM floppy controller");
965 MODULE_LICENSE("GPL");
966 MODULE_AUTHOR("Laurent Vivier <laurent@lvivier.info>");
967 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);
968