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