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