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