asus-nb-wmi: Asus Notebooks WMI Driver
[linux-2.6.git] / drivers / block / swim3.c
1 /*
2  * Driver for the SWIM3 (Super Woz Integrated Machine 3)
3  * floppy controller found on Power Macintoshes.
4  *
5  * Copyright (C) 1996 Paul Mackerras.
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License
9  * as published by the Free Software Foundation; either version
10  * 2 of the License, or (at your option) any later version.
11  */
12
13 /*
14  * TODO:
15  * handle 2 drives
16  * handle GCR disks
17  */
18
19 #include <linux/stddef.h>
20 #include <linux/kernel.h>
21 #include <linux/sched.h>
22 #include <linux/timer.h>
23 #include <linux/delay.h>
24 #include <linux/fd.h>
25 #include <linux/ioctl.h>
26 #include <linux/blkdev.h>
27 #include <linux/interrupt.h>
28 #include <linux/mutex.h>
29 #include <linux/module.h>
30 #include <linux/spinlock.h>
31 #include <asm/io.h>
32 #include <asm/dbdma.h>
33 #include <asm/prom.h>
34 #include <asm/uaccess.h>
35 #include <asm/mediabay.h>
36 #include <asm/machdep.h>
37 #include <asm/pmac_feature.h>
38
39 static DEFINE_MUTEX(swim3_mutex);
40 static struct request_queue *swim3_queue;
41 static struct gendisk *disks[2];
42 static struct request *fd_req;
43
44 #define MAX_FLOPPIES    2
45
46 enum swim_state {
47         idle,
48         locating,
49         seeking,
50         settling,
51         do_transfer,
52         jogging,
53         available,
54         revalidating,
55         ejecting
56 };
57
58 #define REG(x)  unsigned char x; char x ## _pad[15];
59
60 /*
61  * The names for these registers mostly represent speculation on my part.
62  * It will be interesting to see how close they are to the names Apple uses.
63  */
64 struct swim3 {
65         REG(data);
66         REG(timer);             /* counts down at 1MHz */
67         REG(error);
68         REG(mode);
69         REG(select);            /* controls CA0, CA1, CA2 and LSTRB signals */
70         REG(setup);
71         REG(control);           /* writing bits clears them */
72         REG(status);            /* writing bits sets them in control */
73         REG(intr);
74         REG(nseek);             /* # tracks to seek */
75         REG(ctrack);            /* current track number */
76         REG(csect);             /* current sector number */
77         REG(gap3);              /* size of gap 3 in track format */
78         REG(sector);            /* sector # to read or write */
79         REG(nsect);             /* # sectors to read or write */
80         REG(intr_enable);
81 };
82
83 #define control_bic     control
84 #define control_bis     status
85
86 /* Bits in select register */
87 #define CA_MASK         7
88 #define LSTRB           8
89
90 /* Bits in control register */
91 #define DO_SEEK         0x80
92 #define FORMAT          0x40
93 #define SELECT          0x20
94 #define WRITE_SECTORS   0x10
95 #define DO_ACTION       0x08
96 #define DRIVE2_ENABLE   0x04
97 #define DRIVE_ENABLE    0x02
98 #define INTR_ENABLE     0x01
99
100 /* Bits in status register */
101 #define FIFO_1BYTE      0x80
102 #define FIFO_2BYTE      0x40
103 #define ERROR           0x20
104 #define DATA            0x08
105 #define RDDATA          0x04
106 #define INTR_PENDING    0x02
107 #define MARK_BYTE       0x01
108
109 /* Bits in intr and intr_enable registers */
110 #define ERROR_INTR      0x20
111 #define DATA_CHANGED    0x10
112 #define TRANSFER_DONE   0x08
113 #define SEEN_SECTOR     0x04
114 #define SEEK_DONE       0x02
115 #define TIMER_DONE      0x01
116
117 /* Bits in error register */
118 #define ERR_DATA_CRC    0x80
119 #define ERR_ADDR_CRC    0x40
120 #define ERR_OVERRUN     0x04
121 #define ERR_UNDERRUN    0x01
122
123 /* Bits in setup register */
124 #define S_SW_RESET      0x80
125 #define S_GCR_WRITE     0x40
126 #define S_IBM_DRIVE     0x20
127 #define S_TEST_MODE     0x10
128 #define S_FCLK_DIV2     0x08
129 #define S_GCR           0x04
130 #define S_COPY_PROT     0x02
131 #define S_INV_WDATA     0x01
132
133 /* Select values for swim3_action */
134 #define SEEK_POSITIVE   0
135 #define SEEK_NEGATIVE   4
136 #define STEP            1
137 #define MOTOR_ON        2
138 #define MOTOR_OFF       6
139 #define INDEX           3
140 #define EJECT           7
141 #define SETMFM          9
142 #define SETGCR          13
143
144 /* Select values for swim3_select and swim3_readbit */
145 #define STEP_DIR        0
146 #define STEPPING        1
147 #define MOTOR_ON        2
148 #define RELAX           3       /* also eject in progress */
149 #define READ_DATA_0     4
150 #define TWOMEG_DRIVE    5
151 #define SINGLE_SIDED    6       /* drive or diskette is 4MB type? */
152 #define DRIVE_PRESENT   7
153 #define DISK_IN         8
154 #define WRITE_PROT      9
155 #define TRACK_ZERO      10
156 #define TACHO           11
157 #define READ_DATA_1     12
158 #define MFM_MODE        13
159 #define SEEK_COMPLETE   14
160 #define ONEMEG_MEDIA    15
161
162 /* Definitions of values used in writing and formatting */
163 #define DATA_ESCAPE     0x99
164 #define GCR_SYNC_EXC    0x3f
165 #define GCR_SYNC_CONV   0x80
166 #define GCR_FIRST_MARK  0xd5
167 #define GCR_SECOND_MARK 0xaa
168 #define GCR_ADDR_MARK   "\xd5\xaa\x00"
169 #define GCR_DATA_MARK   "\xd5\xaa\x0b"
170 #define GCR_SLIP_BYTE   "\x27\xaa"
171 #define GCR_SELF_SYNC   "\x3f\xbf\x1e\x34\x3c\x3f"
172
173 #define DATA_99         "\x99\x99"
174 #define MFM_ADDR_MARK   "\x99\xa1\x99\xa1\x99\xa1\x99\xfe"
175 #define MFM_INDEX_MARK  "\x99\xc2\x99\xc2\x99\xc2\x99\xfc"
176 #define MFM_GAP_LEN     12
177
178 struct floppy_state {
179         enum swim_state state;
180         spinlock_t lock;
181         struct swim3 __iomem *swim3;    /* hardware registers */
182         struct dbdma_regs __iomem *dma; /* DMA controller registers */
183         int     swim3_intr;     /* interrupt number for SWIM3 */
184         int     dma_intr;       /* interrupt number for DMA channel */
185         int     cur_cyl;        /* cylinder head is on, or -1 */
186         int     cur_sector;     /* last sector we saw go past */
187         int     req_cyl;        /* the cylinder for the current r/w request */
188         int     head;           /* head number ditto */
189         int     req_sector;     /* sector number ditto */
190         int     scount;         /* # sectors we're transferring at present */
191         int     retries;
192         int     settle_time;
193         int     secpercyl;      /* disk geometry information */
194         int     secpertrack;
195         int     total_secs;
196         int     write_prot;     /* 1 if write-protected, 0 if not, -1 dunno */
197         struct dbdma_cmd *dma_cmd;
198         int     ref_count;
199         int     expect_cyl;
200         struct timer_list timeout;
201         int     timeout_pending;
202         int     ejected;
203         wait_queue_head_t wait;
204         int     wanted;
205         struct macio_dev *mdev;
206         char    dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)];
207 };
208
209 static struct floppy_state floppy_states[MAX_FLOPPIES];
210 static int floppy_count = 0;
211 static DEFINE_SPINLOCK(swim3_lock);
212
213 static unsigned short write_preamble[] = {
214         0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */
215         0, 0, 0, 0, 0, 0,                       /* sync field */
216         0x99a1, 0x99a1, 0x99a1, 0x99fb,         /* data address mark */
217         0x990f                                  /* no escape for 512 bytes */
218 };
219
220 static unsigned short write_postamble[] = {
221         0x9904,                                 /* insert CRC */
222         0x4e4e, 0x4e4e,
223         0x9908,                                 /* stop writing */
224         0, 0, 0, 0, 0, 0
225 };
226
227 static void swim3_select(struct floppy_state *fs, int sel);
228 static void swim3_action(struct floppy_state *fs, int action);
229 static int swim3_readbit(struct floppy_state *fs, int bit);
230 static void do_fd_request(struct request_queue * q);
231 static void start_request(struct floppy_state *fs);
232 static void set_timeout(struct floppy_state *fs, int nticks,
233                         void (*proc)(unsigned long));
234 static void scan_track(struct floppy_state *fs);
235 static void seek_track(struct floppy_state *fs, int n);
236 static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count);
237 static void setup_transfer(struct floppy_state *fs);
238 static void act(struct floppy_state *fs);
239 static void scan_timeout(unsigned long data);
240 static void seek_timeout(unsigned long data);
241 static void settle_timeout(unsigned long data);
242 static void xfer_timeout(unsigned long data);
243 static irqreturn_t swim3_interrupt(int irq, void *dev_id);
244 /*static void fd_dma_interrupt(int irq, void *dev_id);*/
245 static int grab_drive(struct floppy_state *fs, enum swim_state state,
246                       int interruptible);
247 static void release_drive(struct floppy_state *fs);
248 static int fd_eject(struct floppy_state *fs);
249 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
250                         unsigned int cmd, unsigned long param);
251 static int floppy_open(struct block_device *bdev, fmode_t mode);
252 static int floppy_release(struct gendisk *disk, fmode_t mode);
253 static unsigned int floppy_check_events(struct gendisk *disk,
254                                         unsigned int clearing);
255 static int floppy_revalidate(struct gendisk *disk);
256
257 static bool swim3_end_request(int err, unsigned int nr_bytes)
258 {
259         if (__blk_end_request(fd_req, err, nr_bytes))
260                 return true;
261
262         fd_req = NULL;
263         return false;
264 }
265
266 static bool swim3_end_request_cur(int err)
267 {
268         return swim3_end_request(err, blk_rq_cur_bytes(fd_req));
269 }
270
271 static void swim3_select(struct floppy_state *fs, int sel)
272 {
273         struct swim3 __iomem *sw = fs->swim3;
274
275         out_8(&sw->select, RELAX);
276         if (sel & 8)
277                 out_8(&sw->control_bis, SELECT);
278         else
279                 out_8(&sw->control_bic, SELECT);
280         out_8(&sw->select, sel & CA_MASK);
281 }
282
283 static void swim3_action(struct floppy_state *fs, int action)
284 {
285         struct swim3 __iomem *sw = fs->swim3;
286
287         swim3_select(fs, action);
288         udelay(1);
289         out_8(&sw->select, sw->select | LSTRB);
290         udelay(2);
291         out_8(&sw->select, sw->select & ~LSTRB);
292         udelay(1);
293 }
294
295 static int swim3_readbit(struct floppy_state *fs, int bit)
296 {
297         struct swim3 __iomem *sw = fs->swim3;
298         int stat;
299
300         swim3_select(fs, bit);
301         udelay(1);
302         stat = in_8(&sw->status);
303         return (stat & DATA) == 0;
304 }
305
306 static void do_fd_request(struct request_queue * q)
307 {
308         int i;
309
310         for(i=0; i<floppy_count; i++) {
311                 struct floppy_state *fs = &floppy_states[i];
312                 if (fs->mdev->media_bay &&
313                     check_media_bay(fs->mdev->media_bay) != MB_FD)
314                         continue;
315                 start_request(fs);
316         }
317 }
318
319 static void start_request(struct floppy_state *fs)
320 {
321         struct request *req;
322         unsigned long x;
323
324         if (fs->state == idle && fs->wanted) {
325                 fs->state = available;
326                 wake_up(&fs->wait);
327                 return;
328         }
329         while (fs->state == idle) {
330                 if (!fd_req) {
331                         fd_req = blk_fetch_request(swim3_queue);
332                         if (!fd_req)
333                                 break;
334                 }
335                 req = fd_req;
336 #if 0
337                 printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%u buf=%p\n",
338                        req->rq_disk->disk_name, req->cmd,
339                        (long)blk_rq_pos(req), blk_rq_sectors(req), req->buffer);
340                 printk("           errors=%d current_nr_sectors=%u\n",
341                        req->errors, blk_rq_cur_sectors(req));
342 #endif
343
344                 if (blk_rq_pos(req) >= fs->total_secs) {
345                         swim3_end_request_cur(-EIO);
346                         continue;
347                 }
348                 if (fs->ejected) {
349                         swim3_end_request_cur(-EIO);
350                         continue;
351                 }
352
353                 if (rq_data_dir(req) == WRITE) {
354                         if (fs->write_prot < 0)
355                                 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
356                         if (fs->write_prot) {
357                                 swim3_end_request_cur(-EIO);
358                                 continue;
359                         }
360                 }
361
362                 /* Do not remove the cast. blk_rq_pos(req) is now a
363                  * sector_t and can be 64 bits, but it will never go
364                  * past 32 bits for this driver anyway, so we can
365                  * safely cast it down and not have to do a 64/32
366                  * division
367                  */
368                 fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl;
369                 x = ((long)blk_rq_pos(req)) % fs->secpercyl;
370                 fs->head = x / fs->secpertrack;
371                 fs->req_sector = x % fs->secpertrack + 1;
372                 fd_req = req;
373                 fs->state = do_transfer;
374                 fs->retries = 0;
375
376                 act(fs);
377         }
378 }
379
380 static void set_timeout(struct floppy_state *fs, int nticks,
381                         void (*proc)(unsigned long))
382 {
383         unsigned long flags;
384
385         spin_lock_irqsave(&fs->lock, flags);
386         if (fs->timeout_pending)
387                 del_timer(&fs->timeout);
388         fs->timeout.expires = jiffies + nticks;
389         fs->timeout.function = proc;
390         fs->timeout.data = (unsigned long) fs;
391         add_timer(&fs->timeout);
392         fs->timeout_pending = 1;
393         spin_unlock_irqrestore(&fs->lock, flags);
394 }
395
396 static inline void scan_track(struct floppy_state *fs)
397 {
398         struct swim3 __iomem *sw = fs->swim3;
399
400         swim3_select(fs, READ_DATA_0);
401         in_8(&sw->intr);                /* clear SEEN_SECTOR bit */
402         in_8(&sw->error);
403         out_8(&sw->intr_enable, SEEN_SECTOR);
404         out_8(&sw->control_bis, DO_ACTION);
405         /* enable intr when track found */
406         set_timeout(fs, HZ, scan_timeout);      /* enable timeout */
407 }
408
409 static inline void seek_track(struct floppy_state *fs, int n)
410 {
411         struct swim3 __iomem *sw = fs->swim3;
412
413         if (n >= 0) {
414                 swim3_action(fs, SEEK_POSITIVE);
415                 sw->nseek = n;
416         } else {
417                 swim3_action(fs, SEEK_NEGATIVE);
418                 sw->nseek = -n;
419         }
420         fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
421         swim3_select(fs, STEP);
422         in_8(&sw->error);
423         /* enable intr when seek finished */
424         out_8(&sw->intr_enable, SEEK_DONE);
425         out_8(&sw->control_bis, DO_SEEK);
426         set_timeout(fs, 3*HZ, seek_timeout);    /* enable timeout */
427         fs->settle_time = 0;
428 }
429
430 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
431                             void *buf, int count)
432 {
433         st_le16(&cp->req_count, count);
434         st_le16(&cp->command, cmd);
435         st_le32(&cp->phy_addr, virt_to_bus(buf));
436         cp->xfer_status = 0;
437 }
438
439 static inline void setup_transfer(struct floppy_state *fs)
440 {
441         int n;
442         struct swim3 __iomem *sw = fs->swim3;
443         struct dbdma_cmd *cp = fs->dma_cmd;
444         struct dbdma_regs __iomem *dr = fs->dma;
445
446         if (blk_rq_cur_sectors(fd_req) <= 0) {
447                 printk(KERN_ERR "swim3: transfer 0 sectors?\n");
448                 return;
449         }
450         if (rq_data_dir(fd_req) == WRITE)
451                 n = 1;
452         else {
453                 n = fs->secpertrack - fs->req_sector + 1;
454                 if (n > blk_rq_cur_sectors(fd_req))
455                         n = blk_rq_cur_sectors(fd_req);
456         }
457         fs->scount = n;
458         swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
459         out_8(&sw->sector, fs->req_sector);
460         out_8(&sw->nsect, n);
461         out_8(&sw->gap3, 0);
462         out_le32(&dr->cmdptr, virt_to_bus(cp));
463         if (rq_data_dir(fd_req) == WRITE) {
464                 /* Set up 3 dma commands: write preamble, data, postamble */
465                 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
466                 ++cp;
467                 init_dma(cp, OUTPUT_MORE, fd_req->buffer, 512);
468                 ++cp;
469                 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
470         } else {
471                 init_dma(cp, INPUT_LAST, fd_req->buffer, n * 512);
472         }
473         ++cp;
474         out_le16(&cp->command, DBDMA_STOP);
475         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
476         in_8(&sw->error);
477         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
478         if (rq_data_dir(fd_req) == WRITE)
479                 out_8(&sw->control_bis, WRITE_SECTORS);
480         in_8(&sw->intr);
481         out_le32(&dr->control, (RUN << 16) | RUN);
482         /* enable intr when transfer complete */
483         out_8(&sw->intr_enable, TRANSFER_DONE);
484         out_8(&sw->control_bis, DO_ACTION);
485         set_timeout(fs, 2*HZ, xfer_timeout);    /* enable timeout */
486 }
487
488 static void act(struct floppy_state *fs)
489 {
490         for (;;) {
491                 switch (fs->state) {
492                 case idle:
493                         return;         /* XXX shouldn't get here */
494
495                 case locating:
496                         if (swim3_readbit(fs, TRACK_ZERO)) {
497                                 fs->cur_cyl = 0;
498                                 if (fs->req_cyl == 0)
499                                         fs->state = do_transfer;
500                                 else
501                                         fs->state = seeking;
502                                 break;
503                         }
504                         scan_track(fs);
505                         return;
506
507                 case seeking:
508                         if (fs->cur_cyl < 0) {
509                                 fs->expect_cyl = -1;
510                                 fs->state = locating;
511                                 break;
512                         }
513                         if (fs->req_cyl == fs->cur_cyl) {
514                                 printk("whoops, seeking 0\n");
515                                 fs->state = do_transfer;
516                                 break;
517                         }
518                         seek_track(fs, fs->req_cyl - fs->cur_cyl);
519                         return;
520
521                 case settling:
522                         /* check for SEEK_COMPLETE after 30ms */
523                         fs->settle_time = (HZ + 32) / 33;
524                         set_timeout(fs, fs->settle_time, settle_timeout);
525                         return;
526
527                 case do_transfer:
528                         if (fs->cur_cyl != fs->req_cyl) {
529                                 if (fs->retries > 5) {
530                                         swim3_end_request_cur(-EIO);
531                                         fs->state = idle;
532                                         return;
533                                 }
534                                 fs->state = seeking;
535                                 break;
536                         }
537                         setup_transfer(fs);
538                         return;
539
540                 case jogging:
541                         seek_track(fs, -5);
542                         return;
543
544                 default:
545                         printk(KERN_ERR"swim3: unknown state %d\n", fs->state);
546                         return;
547                 }
548         }
549 }
550
551 static void scan_timeout(unsigned long data)
552 {
553         struct floppy_state *fs = (struct floppy_state *) data;
554         struct swim3 __iomem *sw = fs->swim3;
555
556         fs->timeout_pending = 0;
557         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
558         out_8(&sw->select, RELAX);
559         out_8(&sw->intr_enable, 0);
560         fs->cur_cyl = -1;
561         if (fs->retries > 5) {
562                 swim3_end_request_cur(-EIO);
563                 fs->state = idle;
564                 start_request(fs);
565         } else {
566                 fs->state = jogging;
567                 act(fs);
568         }
569 }
570
571 static void seek_timeout(unsigned long data)
572 {
573         struct floppy_state *fs = (struct floppy_state *) data;
574         struct swim3 __iomem *sw = fs->swim3;
575
576         fs->timeout_pending = 0;
577         out_8(&sw->control_bic, DO_SEEK);
578         out_8(&sw->select, RELAX);
579         out_8(&sw->intr_enable, 0);
580         printk(KERN_ERR "swim3: seek timeout\n");
581         swim3_end_request_cur(-EIO);
582         fs->state = idle;
583         start_request(fs);
584 }
585
586 static void settle_timeout(unsigned long data)
587 {
588         struct floppy_state *fs = (struct floppy_state *) data;
589         struct swim3 __iomem *sw = fs->swim3;
590
591         fs->timeout_pending = 0;
592         if (swim3_readbit(fs, SEEK_COMPLETE)) {
593                 out_8(&sw->select, RELAX);
594                 fs->state = locating;
595                 act(fs);
596                 return;
597         }
598         out_8(&sw->select, RELAX);
599         if (fs->settle_time < 2*HZ) {
600                 ++fs->settle_time;
601                 set_timeout(fs, 1, settle_timeout);
602                 return;
603         }
604         printk(KERN_ERR "swim3: seek settle timeout\n");
605         swim3_end_request_cur(-EIO);
606         fs->state = idle;
607         start_request(fs);
608 }
609
610 static void xfer_timeout(unsigned long data)
611 {
612         struct floppy_state *fs = (struct floppy_state *) data;
613         struct swim3 __iomem *sw = fs->swim3;
614         struct dbdma_regs __iomem *dr = fs->dma;
615         int n;
616
617         fs->timeout_pending = 0;
618         out_le32(&dr->control, RUN << 16);
619         /* We must wait a bit for dbdma to stop */
620         for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
621                 udelay(1);
622         out_8(&sw->intr_enable, 0);
623         out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
624         out_8(&sw->select, RELAX);
625         printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
626                (rq_data_dir(fd_req)==WRITE? "writ": "read"),
627                (long)blk_rq_pos(fd_req));
628         swim3_end_request_cur(-EIO);
629         fs->state = idle;
630         start_request(fs);
631 }
632
633 static irqreturn_t swim3_interrupt(int irq, void *dev_id)
634 {
635         struct floppy_state *fs = (struct floppy_state *) dev_id;
636         struct swim3 __iomem *sw = fs->swim3;
637         int intr, err, n;
638         int stat, resid;
639         struct dbdma_regs __iomem *dr;
640         struct dbdma_cmd *cp;
641
642         intr = in_8(&sw->intr);
643         err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
644         if ((intr & ERROR_INTR) && fs->state != do_transfer)
645                 printk(KERN_ERR "swim3_interrupt, state=%d, dir=%x, intr=%x, err=%x\n",
646                        fs->state, rq_data_dir(fd_req), intr, err);
647         switch (fs->state) {
648         case locating:
649                 if (intr & SEEN_SECTOR) {
650                         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
651                         out_8(&sw->select, RELAX);
652                         out_8(&sw->intr_enable, 0);
653                         del_timer(&fs->timeout);
654                         fs->timeout_pending = 0;
655                         if (sw->ctrack == 0xff) {
656                                 printk(KERN_ERR "swim3: seen sector but cyl=ff?\n");
657                                 fs->cur_cyl = -1;
658                                 if (fs->retries > 5) {
659                                         swim3_end_request_cur(-EIO);
660                                         fs->state = idle;
661                                         start_request(fs);
662                                 } else {
663                                         fs->state = jogging;
664                                         act(fs);
665                                 }
666                                 break;
667                         }
668                         fs->cur_cyl = sw->ctrack;
669                         fs->cur_sector = sw->csect;
670                         if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
671                                 printk(KERN_ERR "swim3: expected cyl %d, got %d\n",
672                                        fs->expect_cyl, fs->cur_cyl);
673                         fs->state = do_transfer;
674                         act(fs);
675                 }
676                 break;
677         case seeking:
678         case jogging:
679                 if (sw->nseek == 0) {
680                         out_8(&sw->control_bic, DO_SEEK);
681                         out_8(&sw->select, RELAX);
682                         out_8(&sw->intr_enable, 0);
683                         del_timer(&fs->timeout);
684                         fs->timeout_pending = 0;
685                         if (fs->state == seeking)
686                                 ++fs->retries;
687                         fs->state = settling;
688                         act(fs);
689                 }
690                 break;
691         case settling:
692                 out_8(&sw->intr_enable, 0);
693                 del_timer(&fs->timeout);
694                 fs->timeout_pending = 0;
695                 act(fs);
696                 break;
697         case do_transfer:
698                 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
699                         break;
700                 out_8(&sw->intr_enable, 0);
701                 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
702                 out_8(&sw->select, RELAX);
703                 del_timer(&fs->timeout);
704                 fs->timeout_pending = 0;
705                 dr = fs->dma;
706                 cp = fs->dma_cmd;
707                 if (rq_data_dir(fd_req) == WRITE)
708                         ++cp;
709                 /*
710                  * Check that the main data transfer has finished.
711                  * On writing, the swim3 sometimes doesn't use
712                  * up all the bytes of the postamble, so we can still
713                  * see DMA active here.  That doesn't matter as long
714                  * as all the sector data has been transferred.
715                  */
716                 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
717                         /* wait a little while for DMA to complete */
718                         for (n = 0; n < 100; ++n) {
719                                 if (cp->xfer_status != 0)
720                                         break;
721                                 udelay(1);
722                                 barrier();
723                         }
724                 }
725                 /* turn off DMA */
726                 out_le32(&dr->control, (RUN | PAUSE) << 16);
727                 stat = ld_le16(&cp->xfer_status);
728                 resid = ld_le16(&cp->res_count);
729                 if (intr & ERROR_INTR) {
730                         n = fs->scount - 1 - resid / 512;
731                         if (n > 0) {
732                                 blk_update_request(fd_req, 0, n << 9);
733                                 fs->req_sector += n;
734                         }
735                         if (fs->retries < 5) {
736                                 ++fs->retries;
737                                 act(fs);
738                         } else {
739                                 printk("swim3: error %sing block %ld (err=%x)\n",
740                                        rq_data_dir(fd_req) == WRITE? "writ": "read",
741                                        (long)blk_rq_pos(fd_req), err);
742                                 swim3_end_request_cur(-EIO);
743                                 fs->state = idle;
744                         }
745                 } else {
746                         if ((stat & ACTIVE) == 0 || resid != 0) {
747                                 /* musta been an error */
748                                 printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid);
749                                 printk(KERN_ERR "  state=%d, dir=%x, intr=%x, err=%x\n",
750                                        fs->state, rq_data_dir(fd_req), intr, err);
751                                 swim3_end_request_cur(-EIO);
752                                 fs->state = idle;
753                                 start_request(fs);
754                                 break;
755                         }
756                         if (swim3_end_request(0, fs->scount << 9)) {
757                                 fs->req_sector += fs->scount;
758                                 if (fs->req_sector > fs->secpertrack) {
759                                         fs->req_sector -= fs->secpertrack;
760                                         if (++fs->head > 1) {
761                                                 fs->head = 0;
762                                                 ++fs->req_cyl;
763                                         }
764                                 }
765                                 act(fs);
766                         } else
767                                 fs->state = idle;
768                 }
769                 if (fs->state == idle)
770                         start_request(fs);
771                 break;
772         default:
773                 printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state);
774         }
775         return IRQ_HANDLED;
776 }
777
778 /*
779 static void fd_dma_interrupt(int irq, void *dev_id)
780 {
781 }
782 */
783
784 static int grab_drive(struct floppy_state *fs, enum swim_state state,
785                       int interruptible)
786 {
787         unsigned long flags;
788
789         spin_lock_irqsave(&fs->lock, flags);
790         if (fs->state != idle) {
791                 ++fs->wanted;
792                 while (fs->state != available) {
793                         if (interruptible && signal_pending(current)) {
794                                 --fs->wanted;
795                                 spin_unlock_irqrestore(&fs->lock, flags);
796                                 return -EINTR;
797                         }
798                         interruptible_sleep_on(&fs->wait);
799                 }
800                 --fs->wanted;
801         }
802         fs->state = state;
803         spin_unlock_irqrestore(&fs->lock, flags);
804         return 0;
805 }
806
807 static void release_drive(struct floppy_state *fs)
808 {
809         unsigned long flags;
810
811         spin_lock_irqsave(&fs->lock, flags);
812         fs->state = idle;
813         start_request(fs);
814         spin_unlock_irqrestore(&fs->lock, flags);
815 }
816
817 static int fd_eject(struct floppy_state *fs)
818 {
819         int err, n;
820
821         err = grab_drive(fs, ejecting, 1);
822         if (err)
823                 return err;
824         swim3_action(fs, EJECT);
825         for (n = 20; n > 0; --n) {
826                 if (signal_pending(current)) {
827                         err = -EINTR;
828                         break;
829                 }
830                 swim3_select(fs, RELAX);
831                 schedule_timeout_interruptible(1);
832                 if (swim3_readbit(fs, DISK_IN) == 0)
833                         break;
834         }
835         swim3_select(fs, RELAX);
836         udelay(150);
837         fs->ejected = 1;
838         release_drive(fs);
839         return err;
840 }
841
842 static struct floppy_struct floppy_type =
843         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL };    /*  7 1.44MB 3.5"   */
844
845 static int floppy_locked_ioctl(struct block_device *bdev, fmode_t mode,
846                         unsigned int cmd, unsigned long param)
847 {
848         struct floppy_state *fs = bdev->bd_disk->private_data;
849         int err;
850                 
851         if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
852                 return -EPERM;
853
854         if (fs->mdev->media_bay &&
855             check_media_bay(fs->mdev->media_bay) != MB_FD)
856                 return -ENXIO;
857
858         switch (cmd) {
859         case FDEJECT:
860                 if (fs->ref_count != 1)
861                         return -EBUSY;
862                 err = fd_eject(fs);
863                 return err;
864         case FDGETPRM:
865                 if (copy_to_user((void __user *) param, &floppy_type,
866                                  sizeof(struct floppy_struct)))
867                         return -EFAULT;
868                 return 0;
869         }
870         return -ENOTTY;
871 }
872
873 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
874                                  unsigned int cmd, unsigned long param)
875 {
876         int ret;
877
878         mutex_lock(&swim3_mutex);
879         ret = floppy_locked_ioctl(bdev, mode, cmd, param);
880         mutex_unlock(&swim3_mutex);
881
882         return ret;
883 }
884
885 static int floppy_open(struct block_device *bdev, fmode_t mode)
886 {
887         struct floppy_state *fs = bdev->bd_disk->private_data;
888         struct swim3 __iomem *sw = fs->swim3;
889         int n, err = 0;
890
891         if (fs->ref_count == 0) {
892                 if (fs->mdev->media_bay &&
893                     check_media_bay(fs->mdev->media_bay) != MB_FD)
894                         return -ENXIO;
895                 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
896                 out_8(&sw->control_bic, 0xff);
897                 out_8(&sw->mode, 0x95);
898                 udelay(10);
899                 out_8(&sw->intr_enable, 0);
900                 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
901                 swim3_action(fs, MOTOR_ON);
902                 fs->write_prot = -1;
903                 fs->cur_cyl = -1;
904                 for (n = 0; n < 2 * HZ; ++n) {
905                         if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
906                                 break;
907                         if (signal_pending(current)) {
908                                 err = -EINTR;
909                                 break;
910                         }
911                         swim3_select(fs, RELAX);
912                         schedule_timeout_interruptible(1);
913                 }
914                 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
915                                  || swim3_readbit(fs, DISK_IN) == 0))
916                         err = -ENXIO;
917                 swim3_action(fs, SETMFM);
918                 swim3_select(fs, RELAX);
919
920         } else if (fs->ref_count == -1 || mode & FMODE_EXCL)
921                 return -EBUSY;
922
923         if (err == 0 && (mode & FMODE_NDELAY) == 0
924             && (mode & (FMODE_READ|FMODE_WRITE))) {
925                 check_disk_change(bdev);
926                 if (fs->ejected)
927                         err = -ENXIO;
928         }
929
930         if (err == 0 && (mode & FMODE_WRITE)) {
931                 if (fs->write_prot < 0)
932                         fs->write_prot = swim3_readbit(fs, WRITE_PROT);
933                 if (fs->write_prot)
934                         err = -EROFS;
935         }
936
937         if (err) {
938                 if (fs->ref_count == 0) {
939                         swim3_action(fs, MOTOR_OFF);
940                         out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
941                         swim3_select(fs, RELAX);
942                 }
943                 return err;
944         }
945
946         if (mode & FMODE_EXCL)
947                 fs->ref_count = -1;
948         else
949                 ++fs->ref_count;
950
951         return 0;
952 }
953
954 static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
955 {
956         int ret;
957
958         mutex_lock(&swim3_mutex);
959         ret = floppy_open(bdev, mode);
960         mutex_unlock(&swim3_mutex);
961
962         return ret;
963 }
964
965 static int floppy_release(struct gendisk *disk, fmode_t mode)
966 {
967         struct floppy_state *fs = disk->private_data;
968         struct swim3 __iomem *sw = fs->swim3;
969         mutex_lock(&swim3_mutex);
970         if (fs->ref_count > 0 && --fs->ref_count == 0) {
971                 swim3_action(fs, MOTOR_OFF);
972                 out_8(&sw->control_bic, 0xff);
973                 swim3_select(fs, RELAX);
974         }
975         mutex_unlock(&swim3_mutex);
976         return 0;
977 }
978
979 static unsigned int floppy_check_events(struct gendisk *disk,
980                                         unsigned int clearing)
981 {
982         struct floppy_state *fs = disk->private_data;
983         return fs->ejected ? DISK_EVENT_MEDIA_CHANGE : 0;
984 }
985
986 static int floppy_revalidate(struct gendisk *disk)
987 {
988         struct floppy_state *fs = disk->private_data;
989         struct swim3 __iomem *sw;
990         int ret, n;
991
992         if (fs->mdev->media_bay &&
993             check_media_bay(fs->mdev->media_bay) != MB_FD)
994                 return -ENXIO;
995
996         sw = fs->swim3;
997         grab_drive(fs, revalidating, 0);
998         out_8(&sw->intr_enable, 0);
999         out_8(&sw->control_bis, DRIVE_ENABLE);
1000         swim3_action(fs, MOTOR_ON);     /* necessary? */
1001         fs->write_prot = -1;
1002         fs->cur_cyl = -1;
1003         mdelay(1);
1004         for (n = HZ; n > 0; --n) {
1005                 if (swim3_readbit(fs, SEEK_COMPLETE))
1006                         break;
1007                 if (signal_pending(current))
1008                         break;
1009                 swim3_select(fs, RELAX);
1010                 schedule_timeout_interruptible(1);
1011         }
1012         ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
1013                 || swim3_readbit(fs, DISK_IN) == 0;
1014         if (ret)
1015                 swim3_action(fs, MOTOR_OFF);
1016         else {
1017                 fs->ejected = 0;
1018                 swim3_action(fs, SETMFM);
1019         }
1020         swim3_select(fs, RELAX);
1021
1022         release_drive(fs);
1023         return ret;
1024 }
1025
1026 static const struct block_device_operations floppy_fops = {
1027         .open           = floppy_unlocked_open,
1028         .release        = floppy_release,
1029         .ioctl          = floppy_ioctl,
1030         .check_events   = floppy_check_events,
1031         .revalidate_disk= floppy_revalidate,
1032 };
1033
1034 static int swim3_add_device(struct macio_dev *mdev, int index)
1035 {
1036         struct device_node *swim = mdev->ofdev.dev.of_node;
1037         struct floppy_state *fs = &floppy_states[index];
1038         int rc = -EBUSY;
1039
1040         /* Check & Request resources */
1041         if (macio_resource_count(mdev) < 2) {
1042                 printk(KERN_WARNING "ifd%d: no address for %s\n",
1043                        index, swim->full_name);
1044                 return -ENXIO;
1045         }
1046         if (macio_irq_count(mdev) < 2) {
1047                 printk(KERN_WARNING "fd%d: no intrs for device %s\n",
1048                         index, swim->full_name);
1049         }
1050         if (macio_request_resource(mdev, 0, "swim3 (mmio)")) {
1051                 printk(KERN_ERR "fd%d: can't request mmio resource for %s\n",
1052                        index, swim->full_name);
1053                 return -EBUSY;
1054         }
1055         if (macio_request_resource(mdev, 1, "swim3 (dma)")) {
1056                 printk(KERN_ERR "fd%d: can't request dma resource for %s\n",
1057                        index, swim->full_name);
1058                 macio_release_resource(mdev, 0);
1059                 return -EBUSY;
1060         }
1061         dev_set_drvdata(&mdev->ofdev.dev, fs);
1062
1063         if (mdev->media_bay == NULL)
1064                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1065         
1066         memset(fs, 0, sizeof(*fs));
1067         spin_lock_init(&fs->lock);
1068         fs->state = idle;
1069         fs->swim3 = (struct swim3 __iomem *)
1070                 ioremap(macio_resource_start(mdev, 0), 0x200);
1071         if (fs->swim3 == NULL) {
1072                 printk("fd%d: couldn't map registers for %s\n",
1073                        index, swim->full_name);
1074                 rc = -ENOMEM;
1075                 goto out_release;
1076         }
1077         fs->dma = (struct dbdma_regs __iomem *)
1078                 ioremap(macio_resource_start(mdev, 1), 0x200);
1079         if (fs->dma == NULL) {
1080                 printk("fd%d: couldn't map DMA for %s\n",
1081                        index, swim->full_name);
1082                 iounmap(fs->swim3);
1083                 rc = -ENOMEM;
1084                 goto out_release;
1085         }
1086         fs->swim3_intr = macio_irq(mdev, 0);
1087         fs->dma_intr = macio_irq(mdev, 1);
1088         fs->cur_cyl = -1;
1089         fs->cur_sector = -1;
1090         fs->secpercyl = 36;
1091         fs->secpertrack = 18;
1092         fs->total_secs = 2880;
1093         fs->mdev = mdev;
1094         init_waitqueue_head(&fs->wait);
1095
1096         fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1097         memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1098         st_le16(&fs->dma_cmd[1].command, DBDMA_STOP);
1099
1100         if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1101                 printk(KERN_ERR "fd%d: couldn't request irq %d for %s\n",
1102                        index, fs->swim3_intr, swim->full_name);
1103                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1104                 goto out_unmap;
1105                 return -EBUSY;
1106         }
1107 /*
1108         if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) {
1109                 printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA",
1110                        fs->dma_intr);
1111                 return -EBUSY;
1112         }
1113 */
1114
1115         init_timer(&fs->timeout);
1116
1117         printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count,
1118                 mdev->media_bay ? "in media bay" : "");
1119
1120         return 0;
1121
1122  out_unmap:
1123         iounmap(fs->dma);
1124         iounmap(fs->swim3);
1125
1126  out_release:
1127         macio_release_resource(mdev, 0);
1128         macio_release_resource(mdev, 1);
1129
1130         return rc;
1131 }
1132
1133 static int __devinit swim3_attach(struct macio_dev *mdev, const struct of_device_id *match)
1134 {
1135         int i, rc;
1136         struct gendisk *disk;
1137
1138         /* Add the drive */
1139         rc = swim3_add_device(mdev, floppy_count);
1140         if (rc)
1141                 return rc;
1142
1143         /* Now create the queue if not there yet */
1144         if (swim3_queue == NULL) {
1145                 /* If we failed, there isn't much we can do as the driver is still
1146                  * too dumb to remove the device, just bail out
1147                  */
1148                 if (register_blkdev(FLOPPY_MAJOR, "fd"))
1149                         return 0;
1150                 swim3_queue = blk_init_queue(do_fd_request, &swim3_lock);
1151                 if (swim3_queue == NULL) {
1152                         unregister_blkdev(FLOPPY_MAJOR, "fd");
1153                         return 0;
1154                 }
1155         }
1156
1157         /* Now register that disk. Same comment about failure handling */
1158         i = floppy_count++;
1159         disk = disks[i] = alloc_disk(1);
1160         if (disk == NULL)
1161                 return 0;
1162
1163         disk->major = FLOPPY_MAJOR;
1164         disk->first_minor = i;
1165         disk->fops = &floppy_fops;
1166         disk->events = DISK_EVENT_MEDIA_CHANGE;
1167         disk->private_data = &floppy_states[i];
1168         disk->queue = swim3_queue;
1169         disk->flags |= GENHD_FL_REMOVABLE;
1170         sprintf(disk->disk_name, "fd%d", i);
1171         set_capacity(disk, 2880);
1172         add_disk(disk);
1173
1174         return 0;
1175 }
1176
1177 static struct of_device_id swim3_match[] =
1178 {
1179         {
1180         .name           = "swim3",
1181         },
1182         {
1183         .compatible     = "ohare-swim3"
1184         },
1185         {
1186         .compatible     = "swim3"
1187         },
1188 };
1189
1190 static struct macio_driver swim3_driver =
1191 {
1192         .driver = {
1193                 .name           = "swim3",
1194                 .of_match_table = swim3_match,
1195         },
1196         .probe          = swim3_attach,
1197 #if 0
1198         .suspend        = swim3_suspend,
1199         .resume         = swim3_resume,
1200 #endif
1201 };
1202
1203
1204 int swim3_init(void)
1205 {
1206         macio_register_driver(&swim3_driver);
1207         return 0;
1208 }
1209
1210 module_init(swim3_init)
1211
1212 MODULE_LICENSE("GPL");
1213 MODULE_AUTHOR("Paul Mackerras");
1214 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);