virtio: Add memory statistics reporting to the balloon driver (V4)
[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 macio_dev *mdev;
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 block_device *bdev, fmode_t mode,
248                         unsigned int cmd, unsigned long param);
249 static int floppy_open(struct block_device *bdev, fmode_t mode);
250 static int floppy_release(struct gendisk *disk, fmode_t mode);
251 static int floppy_check_change(struct gendisk *disk);
252 static int floppy_revalidate(struct gendisk *disk);
253
254 static bool swim3_end_request(int err, unsigned int nr_bytes)
255 {
256         if (__blk_end_request(fd_req, err, nr_bytes))
257                 return true;
258
259         fd_req = NULL;
260         return false;
261 }
262
263 static bool swim3_end_request_cur(int err)
264 {
265         return swim3_end_request(err, blk_rq_cur_bytes(fd_req));
266 }
267
268 static void swim3_select(struct floppy_state *fs, int sel)
269 {
270         struct swim3 __iomem *sw = fs->swim3;
271
272         out_8(&sw->select, RELAX);
273         if (sel & 8)
274                 out_8(&sw->control_bis, SELECT);
275         else
276                 out_8(&sw->control_bic, SELECT);
277         out_8(&sw->select, sel & CA_MASK);
278 }
279
280 static void swim3_action(struct floppy_state *fs, int action)
281 {
282         struct swim3 __iomem *sw = fs->swim3;
283
284         swim3_select(fs, action);
285         udelay(1);
286         out_8(&sw->select, sw->select | LSTRB);
287         udelay(2);
288         out_8(&sw->select, sw->select & ~LSTRB);
289         udelay(1);
290 }
291
292 static int swim3_readbit(struct floppy_state *fs, int bit)
293 {
294         struct swim3 __iomem *sw = fs->swim3;
295         int stat;
296
297         swim3_select(fs, bit);
298         udelay(1);
299         stat = in_8(&sw->status);
300         return (stat & DATA) == 0;
301 }
302
303 static void do_fd_request(struct request_queue * q)
304 {
305         int i;
306
307         for(i=0; i<floppy_count; i++) {
308                 struct floppy_state *fs = &floppy_states[i];
309                 if (fs->mdev->media_bay &&
310                     check_media_bay(fs->mdev->media_bay) != MB_FD)
311                         continue;
312                 start_request(fs);
313         }
314 }
315
316 static void start_request(struct floppy_state *fs)
317 {
318         struct request *req;
319         unsigned long x;
320
321         if (fs->state == idle && fs->wanted) {
322                 fs->state = available;
323                 wake_up(&fs->wait);
324                 return;
325         }
326         while (fs->state == idle) {
327                 if (!fd_req) {
328                         fd_req = blk_fetch_request(swim3_queue);
329                         if (!fd_req)
330                                 break;
331                 }
332                 req = fd_req;
333 #if 0
334                 printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%u buf=%p\n",
335                        req->rq_disk->disk_name, req->cmd,
336                        (long)blk_rq_pos(req), blk_rq_sectors(req), req->buffer);
337                 printk("           errors=%d current_nr_sectors=%u\n",
338                        req->errors, blk_rq_cur_sectors(req));
339 #endif
340
341                 if (blk_rq_pos(req) >= fs->total_secs) {
342                         swim3_end_request_cur(-EIO);
343                         continue;
344                 }
345                 if (fs->ejected) {
346                         swim3_end_request_cur(-EIO);
347                         continue;
348                 }
349
350                 if (rq_data_dir(req) == WRITE) {
351                         if (fs->write_prot < 0)
352                                 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
353                         if (fs->write_prot) {
354                                 swim3_end_request_cur(-EIO);
355                                 continue;
356                         }
357                 }
358
359                 /* Do not remove the cast. blk_rq_pos(req) is now a
360                  * sector_t and can be 64 bits, but it will never go
361                  * past 32 bits for this driver anyway, so we can
362                  * safely cast it down and not have to do a 64/32
363                  * division
364                  */
365                 fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl;
366                 x = ((long)blk_rq_pos(req)) % fs->secpercyl;
367                 fs->head = x / fs->secpertrack;
368                 fs->req_sector = x % fs->secpertrack + 1;
369                 fd_req = req;
370                 fs->state = do_transfer;
371                 fs->retries = 0;
372
373                 act(fs);
374         }
375 }
376
377 static void set_timeout(struct floppy_state *fs, int nticks,
378                         void (*proc)(unsigned long))
379 {
380         unsigned long flags;
381
382         spin_lock_irqsave(&fs->lock, flags);
383         if (fs->timeout_pending)
384                 del_timer(&fs->timeout);
385         fs->timeout.expires = jiffies + nticks;
386         fs->timeout.function = proc;
387         fs->timeout.data = (unsigned long) fs;
388         add_timer(&fs->timeout);
389         fs->timeout_pending = 1;
390         spin_unlock_irqrestore(&fs->lock, flags);
391 }
392
393 static inline void scan_track(struct floppy_state *fs)
394 {
395         struct swim3 __iomem *sw = fs->swim3;
396
397         swim3_select(fs, READ_DATA_0);
398         in_8(&sw->intr);                /* clear SEEN_SECTOR bit */
399         in_8(&sw->error);
400         out_8(&sw->intr_enable, SEEN_SECTOR);
401         out_8(&sw->control_bis, DO_ACTION);
402         /* enable intr when track found */
403         set_timeout(fs, HZ, scan_timeout);      /* enable timeout */
404 }
405
406 static inline void seek_track(struct floppy_state *fs, int n)
407 {
408         struct swim3 __iomem *sw = fs->swim3;
409
410         if (n >= 0) {
411                 swim3_action(fs, SEEK_POSITIVE);
412                 sw->nseek = n;
413         } else {
414                 swim3_action(fs, SEEK_NEGATIVE);
415                 sw->nseek = -n;
416         }
417         fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
418         swim3_select(fs, STEP);
419         in_8(&sw->error);
420         /* enable intr when seek finished */
421         out_8(&sw->intr_enable, SEEK_DONE);
422         out_8(&sw->control_bis, DO_SEEK);
423         set_timeout(fs, 3*HZ, seek_timeout);    /* enable timeout */
424         fs->settle_time = 0;
425 }
426
427 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
428                             void *buf, int count)
429 {
430         st_le16(&cp->req_count, count);
431         st_le16(&cp->command, cmd);
432         st_le32(&cp->phy_addr, virt_to_bus(buf));
433         cp->xfer_status = 0;
434 }
435
436 static inline void setup_transfer(struct floppy_state *fs)
437 {
438         int n;
439         struct swim3 __iomem *sw = fs->swim3;
440         struct dbdma_cmd *cp = fs->dma_cmd;
441         struct dbdma_regs __iomem *dr = fs->dma;
442
443         if (blk_rq_cur_sectors(fd_req) <= 0) {
444                 printk(KERN_ERR "swim3: transfer 0 sectors?\n");
445                 return;
446         }
447         if (rq_data_dir(fd_req) == WRITE)
448                 n = 1;
449         else {
450                 n = fs->secpertrack - fs->req_sector + 1;
451                 if (n > blk_rq_cur_sectors(fd_req))
452                         n = blk_rq_cur_sectors(fd_req);
453         }
454         fs->scount = n;
455         swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
456         out_8(&sw->sector, fs->req_sector);
457         out_8(&sw->nsect, n);
458         out_8(&sw->gap3, 0);
459         out_le32(&dr->cmdptr, virt_to_bus(cp));
460         if (rq_data_dir(fd_req) == WRITE) {
461                 /* Set up 3 dma commands: write preamble, data, postamble */
462                 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
463                 ++cp;
464                 init_dma(cp, OUTPUT_MORE, fd_req->buffer, 512);
465                 ++cp;
466                 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
467         } else {
468                 init_dma(cp, INPUT_LAST, fd_req->buffer, n * 512);
469         }
470         ++cp;
471         out_le16(&cp->command, DBDMA_STOP);
472         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
473         in_8(&sw->error);
474         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
475         if (rq_data_dir(fd_req) == WRITE)
476                 out_8(&sw->control_bis, WRITE_SECTORS);
477         in_8(&sw->intr);
478         out_le32(&dr->control, (RUN << 16) | RUN);
479         /* enable intr when transfer complete */
480         out_8(&sw->intr_enable, TRANSFER_DONE);
481         out_8(&sw->control_bis, DO_ACTION);
482         set_timeout(fs, 2*HZ, xfer_timeout);    /* enable timeout */
483 }
484
485 static void act(struct floppy_state *fs)
486 {
487         for (;;) {
488                 switch (fs->state) {
489                 case idle:
490                         return;         /* XXX shouldn't get here */
491
492                 case locating:
493                         if (swim3_readbit(fs, TRACK_ZERO)) {
494                                 fs->cur_cyl = 0;
495                                 if (fs->req_cyl == 0)
496                                         fs->state = do_transfer;
497                                 else
498                                         fs->state = seeking;
499                                 break;
500                         }
501                         scan_track(fs);
502                         return;
503
504                 case seeking:
505                         if (fs->cur_cyl < 0) {
506                                 fs->expect_cyl = -1;
507                                 fs->state = locating;
508                                 break;
509                         }
510                         if (fs->req_cyl == fs->cur_cyl) {
511                                 printk("whoops, seeking 0\n");
512                                 fs->state = do_transfer;
513                                 break;
514                         }
515                         seek_track(fs, fs->req_cyl - fs->cur_cyl);
516                         return;
517
518                 case settling:
519                         /* check for SEEK_COMPLETE after 30ms */
520                         fs->settle_time = (HZ + 32) / 33;
521                         set_timeout(fs, fs->settle_time, settle_timeout);
522                         return;
523
524                 case do_transfer:
525                         if (fs->cur_cyl != fs->req_cyl) {
526                                 if (fs->retries > 5) {
527                                         swim3_end_request_cur(-EIO);
528                                         fs->state = idle;
529                                         return;
530                                 }
531                                 fs->state = seeking;
532                                 break;
533                         }
534                         setup_transfer(fs);
535                         return;
536
537                 case jogging:
538                         seek_track(fs, -5);
539                         return;
540
541                 default:
542                         printk(KERN_ERR"swim3: unknown state %d\n", fs->state);
543                         return;
544                 }
545         }
546 }
547
548 static void scan_timeout(unsigned long data)
549 {
550         struct floppy_state *fs = (struct floppy_state *) data;
551         struct swim3 __iomem *sw = fs->swim3;
552
553         fs->timeout_pending = 0;
554         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
555         out_8(&sw->select, RELAX);
556         out_8(&sw->intr_enable, 0);
557         fs->cur_cyl = -1;
558         if (fs->retries > 5) {
559                 swim3_end_request_cur(-EIO);
560                 fs->state = idle;
561                 start_request(fs);
562         } else {
563                 fs->state = jogging;
564                 act(fs);
565         }
566 }
567
568 static void seek_timeout(unsigned long data)
569 {
570         struct floppy_state *fs = (struct floppy_state *) data;
571         struct swim3 __iomem *sw = fs->swim3;
572
573         fs->timeout_pending = 0;
574         out_8(&sw->control_bic, DO_SEEK);
575         out_8(&sw->select, RELAX);
576         out_8(&sw->intr_enable, 0);
577         printk(KERN_ERR "swim3: seek timeout\n");
578         swim3_end_request_cur(-EIO);
579         fs->state = idle;
580         start_request(fs);
581 }
582
583 static void settle_timeout(unsigned long data)
584 {
585         struct floppy_state *fs = (struct floppy_state *) data;
586         struct swim3 __iomem *sw = fs->swim3;
587
588         fs->timeout_pending = 0;
589         if (swim3_readbit(fs, SEEK_COMPLETE)) {
590                 out_8(&sw->select, RELAX);
591                 fs->state = locating;
592                 act(fs);
593                 return;
594         }
595         out_8(&sw->select, RELAX);
596         if (fs->settle_time < 2*HZ) {
597                 ++fs->settle_time;
598                 set_timeout(fs, 1, settle_timeout);
599                 return;
600         }
601         printk(KERN_ERR "swim3: seek settle timeout\n");
602         swim3_end_request_cur(-EIO);
603         fs->state = idle;
604         start_request(fs);
605 }
606
607 static void xfer_timeout(unsigned long data)
608 {
609         struct floppy_state *fs = (struct floppy_state *) data;
610         struct swim3 __iomem *sw = fs->swim3;
611         struct dbdma_regs __iomem *dr = fs->dma;
612         int n;
613
614         fs->timeout_pending = 0;
615         out_le32(&dr->control, RUN << 16);
616         /* We must wait a bit for dbdma to stop */
617         for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
618                 udelay(1);
619         out_8(&sw->intr_enable, 0);
620         out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
621         out_8(&sw->select, RELAX);
622         printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
623                (rq_data_dir(fd_req)==WRITE? "writ": "read"),
624                (long)blk_rq_pos(fd_req));
625         swim3_end_request_cur(-EIO);
626         fs->state = idle;
627         start_request(fs);
628 }
629
630 static irqreturn_t swim3_interrupt(int irq, void *dev_id)
631 {
632         struct floppy_state *fs = (struct floppy_state *) dev_id;
633         struct swim3 __iomem *sw = fs->swim3;
634         int intr, err, n;
635         int stat, resid;
636         struct dbdma_regs __iomem *dr;
637         struct dbdma_cmd *cp;
638
639         intr = in_8(&sw->intr);
640         err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
641         if ((intr & ERROR_INTR) && fs->state != do_transfer)
642                 printk(KERN_ERR "swim3_interrupt, state=%d, dir=%x, intr=%x, err=%x\n",
643                        fs->state, rq_data_dir(fd_req), intr, err);
644         switch (fs->state) {
645         case locating:
646                 if (intr & SEEN_SECTOR) {
647                         out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
648                         out_8(&sw->select, RELAX);
649                         out_8(&sw->intr_enable, 0);
650                         del_timer(&fs->timeout);
651                         fs->timeout_pending = 0;
652                         if (sw->ctrack == 0xff) {
653                                 printk(KERN_ERR "swim3: seen sector but cyl=ff?\n");
654                                 fs->cur_cyl = -1;
655                                 if (fs->retries > 5) {
656                                         swim3_end_request_cur(-EIO);
657                                         fs->state = idle;
658                                         start_request(fs);
659                                 } else {
660                                         fs->state = jogging;
661                                         act(fs);
662                                 }
663                                 break;
664                         }
665                         fs->cur_cyl = sw->ctrack;
666                         fs->cur_sector = sw->csect;
667                         if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
668                                 printk(KERN_ERR "swim3: expected cyl %d, got %d\n",
669                                        fs->expect_cyl, fs->cur_cyl);
670                         fs->state = do_transfer;
671                         act(fs);
672                 }
673                 break;
674         case seeking:
675         case jogging:
676                 if (sw->nseek == 0) {
677                         out_8(&sw->control_bic, DO_SEEK);
678                         out_8(&sw->select, RELAX);
679                         out_8(&sw->intr_enable, 0);
680                         del_timer(&fs->timeout);
681                         fs->timeout_pending = 0;
682                         if (fs->state == seeking)
683                                 ++fs->retries;
684                         fs->state = settling;
685                         act(fs);
686                 }
687                 break;
688         case settling:
689                 out_8(&sw->intr_enable, 0);
690                 del_timer(&fs->timeout);
691                 fs->timeout_pending = 0;
692                 act(fs);
693                 break;
694         case do_transfer:
695                 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
696                         break;
697                 out_8(&sw->intr_enable, 0);
698                 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
699                 out_8(&sw->select, RELAX);
700                 del_timer(&fs->timeout);
701                 fs->timeout_pending = 0;
702                 dr = fs->dma;
703                 cp = fs->dma_cmd;
704                 if (rq_data_dir(fd_req) == WRITE)
705                         ++cp;
706                 /*
707                  * Check that the main data transfer has finished.
708                  * On writing, the swim3 sometimes doesn't use
709                  * up all the bytes of the postamble, so we can still
710                  * see DMA active here.  That doesn't matter as long
711                  * as all the sector data has been transferred.
712                  */
713                 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
714                         /* wait a little while for DMA to complete */
715                         for (n = 0; n < 100; ++n) {
716                                 if (cp->xfer_status != 0)
717                                         break;
718                                 udelay(1);
719                                 barrier();
720                         }
721                 }
722                 /* turn off DMA */
723                 out_le32(&dr->control, (RUN | PAUSE) << 16);
724                 stat = ld_le16(&cp->xfer_status);
725                 resid = ld_le16(&cp->res_count);
726                 if (intr & ERROR_INTR) {
727                         n = fs->scount - 1 - resid / 512;
728                         if (n > 0) {
729                                 blk_update_request(fd_req, 0, n << 9);
730                                 fs->req_sector += n;
731                         }
732                         if (fs->retries < 5) {
733                                 ++fs->retries;
734                                 act(fs);
735                         } else {
736                                 printk("swim3: error %sing block %ld (err=%x)\n",
737                                        rq_data_dir(fd_req) == WRITE? "writ": "read",
738                                        (long)blk_rq_pos(fd_req), err);
739                                 swim3_end_request_cur(-EIO);
740                                 fs->state = idle;
741                         }
742                 } else {
743                         if ((stat & ACTIVE) == 0 || resid != 0) {
744                                 /* musta been an error */
745                                 printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid);
746                                 printk(KERN_ERR "  state=%d, dir=%x, intr=%x, err=%x\n",
747                                        fs->state, rq_data_dir(fd_req), intr, err);
748                                 swim3_end_request_cur(-EIO);
749                                 fs->state = idle;
750                                 start_request(fs);
751                                 break;
752                         }
753                         if (swim3_end_request(0, fs->scount << 9)) {
754                                 fs->req_sector += fs->scount;
755                                 if (fs->req_sector > fs->secpertrack) {
756                                         fs->req_sector -= fs->secpertrack;
757                                         if (++fs->head > 1) {
758                                                 fs->head = 0;
759                                                 ++fs->req_cyl;
760                                         }
761                                 }
762                                 act(fs);
763                         } else
764                                 fs->state = idle;
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 block_device *bdev, fmode_t mode,
843                         unsigned int cmd, unsigned long param)
844 {
845         struct floppy_state *fs = bdev->bd_disk->private_data;
846         int err;
847                 
848         if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
849                 return -EPERM;
850
851         if (fs->mdev->media_bay &&
852             check_media_bay(fs->mdev->media_bay) != MB_FD)
853                 return -ENXIO;
854
855         switch (cmd) {
856         case FDEJECT:
857                 if (fs->ref_count != 1)
858                         return -EBUSY;
859                 err = fd_eject(fs);
860                 return err;
861         case FDGETPRM:
862                 if (copy_to_user((void __user *) param, &floppy_type,
863                                  sizeof(struct floppy_struct)))
864                         return -EFAULT;
865                 return 0;
866         }
867         return -ENOTTY;
868 }
869
870 static int floppy_open(struct block_device *bdev, fmode_t mode)
871 {
872         struct floppy_state *fs = bdev->bd_disk->private_data;
873         struct swim3 __iomem *sw = fs->swim3;
874         int n, err = 0;
875
876         if (fs->ref_count == 0) {
877                 if (fs->mdev->media_bay &&
878                     check_media_bay(fs->mdev->media_bay) != MB_FD)
879                         return -ENXIO;
880                 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
881                 out_8(&sw->control_bic, 0xff);
882                 out_8(&sw->mode, 0x95);
883                 udelay(10);
884                 out_8(&sw->intr_enable, 0);
885                 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
886                 swim3_action(fs, MOTOR_ON);
887                 fs->write_prot = -1;
888                 fs->cur_cyl = -1;
889                 for (n = 0; n < 2 * HZ; ++n) {
890                         if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
891                                 break;
892                         if (signal_pending(current)) {
893                                 err = -EINTR;
894                                 break;
895                         }
896                         swim3_select(fs, RELAX);
897                         schedule_timeout_interruptible(1);
898                 }
899                 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
900                                  || swim3_readbit(fs, DISK_IN) == 0))
901                         err = -ENXIO;
902                 swim3_action(fs, SETMFM);
903                 swim3_select(fs, RELAX);
904
905         } else if (fs->ref_count == -1 || mode & FMODE_EXCL)
906                 return -EBUSY;
907
908         if (err == 0 && (mode & FMODE_NDELAY) == 0
909             && (mode & (FMODE_READ|FMODE_WRITE))) {
910                 check_disk_change(bdev);
911                 if (fs->ejected)
912                         err = -ENXIO;
913         }
914
915         if (err == 0 && (mode & FMODE_WRITE)) {
916                 if (fs->write_prot < 0)
917                         fs->write_prot = swim3_readbit(fs, WRITE_PROT);
918                 if (fs->write_prot)
919                         err = -EROFS;
920         }
921
922         if (err) {
923                 if (fs->ref_count == 0) {
924                         swim3_action(fs, MOTOR_OFF);
925                         out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
926                         swim3_select(fs, RELAX);
927                 }
928                 return err;
929         }
930
931         if (mode & FMODE_EXCL)
932                 fs->ref_count = -1;
933         else
934                 ++fs->ref_count;
935
936         return 0;
937 }
938
939 static int floppy_release(struct gendisk *disk, fmode_t mode)
940 {
941         struct floppy_state *fs = disk->private_data;
942         struct swim3 __iomem *sw = fs->swim3;
943         if (fs->ref_count > 0 && --fs->ref_count == 0) {
944                 swim3_action(fs, MOTOR_OFF);
945                 out_8(&sw->control_bic, 0xff);
946                 swim3_select(fs, RELAX);
947         }
948         return 0;
949 }
950
951 static int floppy_check_change(struct gendisk *disk)
952 {
953         struct floppy_state *fs = disk->private_data;
954         return fs->ejected;
955 }
956
957 static int floppy_revalidate(struct gendisk *disk)
958 {
959         struct floppy_state *fs = disk->private_data;
960         struct swim3 __iomem *sw;
961         int ret, n;
962
963         if (fs->mdev->media_bay &&
964             check_media_bay(fs->mdev->media_bay) != MB_FD)
965                 return -ENXIO;
966
967         sw = fs->swim3;
968         grab_drive(fs, revalidating, 0);
969         out_8(&sw->intr_enable, 0);
970         out_8(&sw->control_bis, DRIVE_ENABLE);
971         swim3_action(fs, MOTOR_ON);     /* necessary? */
972         fs->write_prot = -1;
973         fs->cur_cyl = -1;
974         mdelay(1);
975         for (n = HZ; n > 0; --n) {
976                 if (swim3_readbit(fs, SEEK_COMPLETE))
977                         break;
978                 if (signal_pending(current))
979                         break;
980                 swim3_select(fs, RELAX);
981                 schedule_timeout_interruptible(1);
982         }
983         ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
984                 || swim3_readbit(fs, DISK_IN) == 0;
985         if (ret)
986                 swim3_action(fs, MOTOR_OFF);
987         else {
988                 fs->ejected = 0;
989                 swim3_action(fs, SETMFM);
990         }
991         swim3_select(fs, RELAX);
992
993         release_drive(fs);
994         return ret;
995 }
996
997 static const struct block_device_operations floppy_fops = {
998         .open           = floppy_open,
999         .release        = floppy_release,
1000         .locked_ioctl   = floppy_ioctl,
1001         .media_changed  = floppy_check_change,
1002         .revalidate_disk= floppy_revalidate,
1003 };
1004
1005 static int swim3_add_device(struct macio_dev *mdev, int index)
1006 {
1007         struct device_node *swim = mdev->ofdev.node;
1008         struct floppy_state *fs = &floppy_states[index];
1009         int rc = -EBUSY;
1010
1011         /* Check & Request resources */
1012         if (macio_resource_count(mdev) < 2) {
1013                 printk(KERN_WARNING "ifd%d: no address for %s\n",
1014                        index, swim->full_name);
1015                 return -ENXIO;
1016         }
1017         if (macio_irq_count(mdev) < 2) {
1018                 printk(KERN_WARNING "fd%d: no intrs for device %s\n",
1019                         index, swim->full_name);
1020         }
1021         if (macio_request_resource(mdev, 0, "swim3 (mmio)")) {
1022                 printk(KERN_ERR "fd%d: can't request mmio resource for %s\n",
1023                        index, swim->full_name);
1024                 return -EBUSY;
1025         }
1026         if (macio_request_resource(mdev, 1, "swim3 (dma)")) {
1027                 printk(KERN_ERR "fd%d: can't request dma resource for %s\n",
1028                        index, swim->full_name);
1029                 macio_release_resource(mdev, 0);
1030                 return -EBUSY;
1031         }
1032         dev_set_drvdata(&mdev->ofdev.dev, fs);
1033
1034         if (mdev->media_bay == NULL)
1035                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1036         
1037         memset(fs, 0, sizeof(*fs));
1038         spin_lock_init(&fs->lock);
1039         fs->state = idle;
1040         fs->swim3 = (struct swim3 __iomem *)
1041                 ioremap(macio_resource_start(mdev, 0), 0x200);
1042         if (fs->swim3 == NULL) {
1043                 printk("fd%d: couldn't map registers for %s\n",
1044                        index, swim->full_name);
1045                 rc = -ENOMEM;
1046                 goto out_release;
1047         }
1048         fs->dma = (struct dbdma_regs __iomem *)
1049                 ioremap(macio_resource_start(mdev, 1), 0x200);
1050         if (fs->dma == NULL) {
1051                 printk("fd%d: couldn't map DMA for %s\n",
1052                        index, swim->full_name);
1053                 iounmap(fs->swim3);
1054                 rc = -ENOMEM;
1055                 goto out_release;
1056         }
1057         fs->swim3_intr = macio_irq(mdev, 0);
1058         fs->dma_intr = macio_irq(mdev, 1);
1059         fs->cur_cyl = -1;
1060         fs->cur_sector = -1;
1061         fs->secpercyl = 36;
1062         fs->secpertrack = 18;
1063         fs->total_secs = 2880;
1064         fs->mdev = mdev;
1065         init_waitqueue_head(&fs->wait);
1066
1067         fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1068         memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1069         st_le16(&fs->dma_cmd[1].command, DBDMA_STOP);
1070
1071         if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1072                 printk(KERN_ERR "fd%d: couldn't request irq %d for %s\n",
1073                        index, fs->swim3_intr, swim->full_name);
1074                 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1075                 goto out_unmap;
1076                 return -EBUSY;
1077         }
1078 /*
1079         if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) {
1080                 printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA",
1081                        fs->dma_intr);
1082                 return -EBUSY;
1083         }
1084 */
1085
1086         init_timer(&fs->timeout);
1087
1088         printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count,
1089                 mdev->media_bay ? "in media bay" : "");
1090
1091         return 0;
1092
1093  out_unmap:
1094         iounmap(fs->dma);
1095         iounmap(fs->swim3);
1096
1097  out_release:
1098         macio_release_resource(mdev, 0);
1099         macio_release_resource(mdev, 1);
1100
1101         return rc;
1102 }
1103
1104 static int __devinit swim3_attach(struct macio_dev *mdev, const struct of_device_id *match)
1105 {
1106         int i, rc;
1107         struct gendisk *disk;
1108
1109         /* Add the drive */
1110         rc = swim3_add_device(mdev, floppy_count);
1111         if (rc)
1112                 return rc;
1113
1114         /* Now create the queue if not there yet */
1115         if (swim3_queue == NULL) {
1116                 /* If we failed, there isn't much we can do as the driver is still
1117                  * too dumb to remove the device, just bail out
1118                  */
1119                 if (register_blkdev(FLOPPY_MAJOR, "fd"))
1120                         return 0;
1121                 swim3_queue = blk_init_queue(do_fd_request, &swim3_lock);
1122                 if (swim3_queue == NULL) {
1123                         unregister_blkdev(FLOPPY_MAJOR, "fd");
1124                         return 0;
1125                 }
1126         }
1127
1128         /* Now register that disk. Same comment about failure handling */
1129         i = floppy_count++;
1130         disk = disks[i] = alloc_disk(1);
1131         if (disk == NULL)
1132                 return 0;
1133
1134         disk->major = FLOPPY_MAJOR;
1135         disk->first_minor = i;
1136         disk->fops = &floppy_fops;
1137         disk->private_data = &floppy_states[i];
1138         disk->queue = swim3_queue;
1139         disk->flags |= GENHD_FL_REMOVABLE;
1140         sprintf(disk->disk_name, "fd%d", i);
1141         set_capacity(disk, 2880);
1142         add_disk(disk);
1143
1144         return 0;
1145 }
1146
1147 static struct of_device_id swim3_match[] =
1148 {
1149         {
1150         .name           = "swim3",
1151         },
1152         {
1153         .compatible     = "ohare-swim3"
1154         },
1155         {
1156         .compatible     = "swim3"
1157         },
1158 };
1159
1160 static struct macio_driver swim3_driver =
1161 {
1162         .name           = "swim3",
1163         .match_table    = swim3_match,
1164         .probe          = swim3_attach,
1165 #if 0
1166         .suspend        = swim3_suspend,
1167         .resume         = swim3_resume,
1168 #endif
1169 };
1170
1171
1172 int swim3_init(void)
1173 {
1174         macio_register_driver(&swim3_driver);
1175         return 0;
1176 }
1177
1178 module_init(swim3_init)
1179
1180 MODULE_LICENSE("GPL");
1181 MODULE_AUTHOR("Paul Mackerras");
1182 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);