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