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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/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
30struct 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
43struct 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
68struct 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
156enum drive_location {
157 INTERNAL_DRIVE = 0x02,
158 EXTERNAL_DRIVE = 0x04,
159};
160
161enum media_type {
162 DD_MEDIA,
163 HD_MEDIA,
164};
165
166struct 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
198enum motor_action {
199 OFF,
200 ON,
201};
202
203enum head {
204 LOWER_HEAD = 0,
205 UPPER_HEAD = 1,
206};
207
208#define FD_MAX_UNIT 2
209
210struct 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
217extern int swim_read_sector_header(struct swim __iomem *base,
218 struct sector_header *header);
219extern int swim_read_sector_data(struct swim __iomem *base,
220 unsigned char *data);
221
222static DEFINE_MUTEX(swim_mutex);
223static 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
248static 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;
265is_iwm:
266 local_irq_restore(flags);
267 return 0;
268}
269
270static 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
279static 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
295static 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
308static 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
320static 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
341static 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
357static 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
367static 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
385static 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
407static 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
426static 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
443static 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
457static 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
494static 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
526static 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;
552out:
553 spin_unlock_irq(&swd->lock);
554 return err;
555
556}
557
558static 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
565static 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
583static 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
611static 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;
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 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
671static 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
687static 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
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 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
788static 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
853exit_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
861static 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
911out_kfree:
912 kfree(swd);
913out_release_io:
914 release_mem_region(res->start, resource_size(res));
915out:
916 return ret;
917}
918
919static 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
942static struct platform_driver swim_driver = {
943 .probe = swim_probe,
944 .remove_new = swim_remove,
945 .driver = {
946 .name = CARDNAME,
947 },
948};
949
950static 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}
956module_init(swim_init);
957
958static void __exit swim_exit(void)
959{
960 platform_driver_unregister(&swim_driver);
961}
962module_exit(swim_exit);
963
964MODULE_DESCRIPTION("Driver for SWIM floppy controller");
965MODULE_LICENSE("GPL");
966MODULE_AUTHOR("Laurent Vivier <laurent@lvivier.info>");
967MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);