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