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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / block / swim3.c
blob89ddab127e33df525924b73f23501fc9fcab1006
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 #undef DEBUG
20
21 #include <linux/stddef.h>
22 #include <linux/kernel.h>
23 #include <linux/sched.h>
24 #include <linux/timer.h>
25 #include <linux/delay.h>
26 #include <linux/fd.h>
27 #include <linux/ioctl.h>
28 #include <linux/blkdev.h>
29 #include <linux/interrupt.h>
30 #include <linux/mutex.h>
31 #include <linux/module.h>
32 #include <linux/spinlock.h>
33 #include <asm/io.h>
34 #include <asm/dbdma.h>
35 #include <asm/prom.h>
36 #include <asm/uaccess.h>
37 #include <asm/mediabay.h>
38 #include <asm/machdep.h>
39 #include <asm/pmac_feature.h>
40
41 #define MAX_FLOPPIES 2
42
43 static DEFINE_MUTEX(swim3_mutex);
44 static struct gendisk *disks[MAX_FLOPPIES];
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 struct swim3 __iomem *swim3; /* hardware registers */
181 struct dbdma_regs __iomem *dma; /* DMA controller registers */
182 int swim3_intr; /* interrupt number for SWIM3 */
183 int dma_intr; /* interrupt number for DMA channel */
184 int cur_cyl; /* cylinder head is on, or -1 */
185 int cur_sector; /* last sector we saw go past */
186 int req_cyl; /* the cylinder for the current r/w request */
187 int head; /* head number ditto */
188 int req_sector; /* sector number ditto */
189 int scount; /* # sectors we're transferring at present */
190 int retries;
191 int settle_time;
192 int secpercyl; /* disk geometry information */
193 int secpertrack;
194 int total_secs;
195 int write_prot; /* 1 if write-protected, 0 if not, -1 dunno */
196 struct dbdma_cmd *dma_cmd;
197 int ref_count;
198 int expect_cyl;
199 struct timer_list timeout;
200 int timeout_pending;
201 int ejected;
202 wait_queue_head_t wait;
203 int wanted;
204 struct macio_dev *mdev;
205 char dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)];
206 int index;
207 struct request *cur_req;
208 };
209
210 #define swim3_err(fmt, arg...) dev_err(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
211 #define swim3_warn(fmt, arg...) dev_warn(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
212 #define swim3_info(fmt, arg...) dev_info(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
213
214 #ifdef DEBUG
215 #define swim3_dbg(fmt, arg...) dev_dbg(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
216 #else
217 #define swim3_dbg(fmt, arg...) do { } while(0)
218 #endif
219
220 static struct floppy_state floppy_states[MAX_FLOPPIES];
221 static int floppy_count = 0;
222 static DEFINE_SPINLOCK(swim3_lock);
223
224 static unsigned short write_preamble[] = {
225 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */
226 0, 0, 0, 0, 0, 0, /* sync field */
227 0x99a1, 0x99a1, 0x99a1, 0x99fb, /* data address mark */
228 0x990f /* no escape for 512 bytes */
229 };
230
231 static unsigned short write_postamble[] = {
232 0x9904, /* insert CRC */
233 0x4e4e, 0x4e4e,
234 0x9908, /* stop writing */
235 0, 0, 0, 0, 0, 0
236 };
237
238 static void seek_track(struct floppy_state *fs, int n);
239 static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count);
240 static void act(struct floppy_state *fs);
241 static void scan_timeout(unsigned long data);
242 static void seek_timeout(unsigned long data);
243 static void settle_timeout(unsigned long data);
244 static void xfer_timeout(unsigned long data);
245 static irqreturn_t swim3_interrupt(int irq, void *dev_id);
246 /*static void fd_dma_interrupt(int irq, void *dev_id);*/
247 static int grab_drive(struct floppy_state *fs, enum swim_state state,
248 int interruptible);
249 static void release_drive(struct floppy_state *fs);
250 static int fd_eject(struct floppy_state *fs);
251 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
252 unsigned int cmd, unsigned long param);
253 static int floppy_open(struct block_device *bdev, fmode_t mode);
254 static int floppy_release(struct gendisk *disk, fmode_t mode);
255 static unsigned int floppy_check_events(struct gendisk *disk,
256 unsigned int clearing);
257 static int floppy_revalidate(struct gendisk *disk);
258
259 static bool swim3_end_request(struct floppy_state *fs, int err, unsigned int nr_bytes)
260 {
261 struct request *req = fs->cur_req;
262 int rc;
263
264 swim3_dbg(" end request, err=%d nr_bytes=%d, cur_req=%p\n",
265 err, nr_bytes, req);
266
267 if (err)
268 nr_bytes = blk_rq_cur_bytes(req);
269 rc = __blk_end_request(req, err, nr_bytes);
270 if (rc)
271 return true;
272 fs->cur_req = NULL;
273 return false;
274 }
275
276 static void swim3_select(struct floppy_state *fs, int sel)
277 {
278 struct swim3 __iomem *sw = fs->swim3;
279
280 out_8(&sw->select, RELAX);
281 if (sel & 8)
282 out_8(&sw->control_bis, SELECT);
283 else
284 out_8(&sw->control_bic, SELECT);
285 out_8(&sw->select, sel & CA_MASK);
286 }
287
288 static void swim3_action(struct floppy_state *fs, int action)
289 {
290 struct swim3 __iomem *sw = fs->swim3;
291
292 swim3_select(fs, action);
293 udelay(1);
294 out_8(&sw->select, sw->select | LSTRB);
295 udelay(2);
296 out_8(&sw->select, sw->select & ~LSTRB);
297 udelay(1);
298 }
299
300 static int swim3_readbit(struct floppy_state *fs, int bit)
301 {
302 struct swim3 __iomem *sw = fs->swim3;
303 int stat;
304
305 swim3_select(fs, bit);
306 udelay(1);
307 stat = in_8(&sw->status);
308 return (stat & DATA) == 0;
309 }
310
311 static void start_request(struct floppy_state *fs)
312 {
313 struct request *req;
314 unsigned long x;
315
316 swim3_dbg("start request, initial state=%d\n", fs->state);
317
318 if (fs->state == idle && fs->wanted) {
319 fs->state = available;
320 wake_up(&fs->wait);
321 return;
322 }
323 while (fs->state == idle) {
324 swim3_dbg("start request, idle loop, cur_req=%p\n", fs->cur_req);
325 if (!fs->cur_req) {
326 fs->cur_req = blk_fetch_request(disks[fs->index]->queue);
327 swim3_dbg(" fetched request %p\n", fs->cur_req);
328 if (!fs->cur_req)
329 break;
330 }
331 req = fs->cur_req;
332
333 if (fs->mdev->media_bay &&
334 check_media_bay(fs->mdev->media_bay) != MB_FD) {
335 swim3_dbg("%s", " media bay absent, dropping req\n");
336 swim3_end_request(fs, -ENODEV, 0);
337 continue;
338 }
339
340 #if 0 /* This is really too verbose */
341 swim3_dbg("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%u buf=%p\n",
342 req->rq_disk->disk_name, req->cmd,
343 (long)blk_rq_pos(req), blk_rq_sectors(req),
344 req->buffer);
345 swim3_dbg(" errors=%d current_nr_sectors=%u\n",
346 req->errors, blk_rq_cur_sectors(req));
347 #endif
348
349 if (blk_rq_pos(req) >= fs->total_secs) {
350 swim3_dbg(" pos out of bounds (%ld, max is %ld)\n",
351 (long)blk_rq_pos(req), (long)fs->total_secs);
352 swim3_end_request(fs, -EIO, 0);
353 continue;
354 }
355 if (fs->ejected) {
356 swim3_dbg("%s", " disk ejected\n");
357 swim3_end_request(fs, -EIO, 0);
358 continue;
359 }
360
361 if (rq_data_dir(req) == WRITE) {
362 if (fs->write_prot < 0)
363 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
364 if (fs->write_prot) {
365 swim3_dbg("%s", " try to write, disk write protected\n");
366 swim3_end_request(fs, -EIO, 0);
367 continue;
368 }
369 }
370
371 /* Do not remove the cast. blk_rq_pos(req) is now a
372 * sector_t and can be 64 bits, but it will never go
373 * past 32 bits for this driver anyway, so we can
374 * safely cast it down and not have to do a 64/32
375 * division
376 */
377 fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl;
378 x = ((long)blk_rq_pos(req)) % fs->secpercyl;
379 fs->head = x / fs->secpertrack;
380 fs->req_sector = x % fs->secpertrack + 1;
381 fs->state = do_transfer;
382 fs->retries = 0;
383
384 act(fs);
385 }
386 }
387
388 static void do_fd_request(struct request_queue * q)
389 {
390 start_request(q->queuedata);
391 }
392
393 static void set_timeout(struct floppy_state *fs, int nticks,
394 void (*proc)(unsigned long))
395 {
396 if (fs->timeout_pending)
397 del_timer(&fs->timeout);
398 fs->timeout.expires = jiffies + nticks;
399 fs->timeout.function = proc;
400 fs->timeout.data = (unsigned long) fs;
401 add_timer(&fs->timeout);
402 fs->timeout_pending = 1;
403 }
404
405 static inline void scan_track(struct floppy_state *fs)
406 {
407 struct swim3 __iomem *sw = fs->swim3;
408
409 swim3_select(fs, READ_DATA_0);
410 in_8(&sw->intr); /* clear SEEN_SECTOR bit */
411 in_8(&sw->error);
412 out_8(&sw->intr_enable, SEEN_SECTOR);
413 out_8(&sw->control_bis, DO_ACTION);
414 /* enable intr when track found */
415 set_timeout(fs, HZ, scan_timeout); /* enable timeout */
416 }
417
418 static inline void seek_track(struct floppy_state *fs, int n)
419 {
420 struct swim3 __iomem *sw = fs->swim3;
421
422 if (n >= 0) {
423 swim3_action(fs, SEEK_POSITIVE);
424 sw->nseek = n;
425 } else {
426 swim3_action(fs, SEEK_NEGATIVE);
427 sw->nseek = -n;
428 }
429 fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
430 swim3_select(fs, STEP);
431 in_8(&sw->error);
432 /* enable intr when seek finished */
433 out_8(&sw->intr_enable, SEEK_DONE);
434 out_8(&sw->control_bis, DO_SEEK);
435 set_timeout(fs, 3*HZ, seek_timeout); /* enable timeout */
436 fs->settle_time = 0;
437 }
438
439 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
440 void *buf, int count)
441 {
442 st_le16(&cp->req_count, count);
443 st_le16(&cp->command, cmd);
444 st_le32(&cp->phy_addr, virt_to_bus(buf));
445 cp->xfer_status = 0;
446 }
447
448 static inline void setup_transfer(struct floppy_state *fs)
449 {
450 int n;
451 struct swim3 __iomem *sw = fs->swim3;
452 struct dbdma_cmd *cp = fs->dma_cmd;
453 struct dbdma_regs __iomem *dr = fs->dma;
454 struct request *req = fs->cur_req;
455
456 if (blk_rq_cur_sectors(req) <= 0) {
457 swim3_warn("%s", "Transfer 0 sectors ?\n");
458 return;
459 }
460 if (rq_data_dir(req) == WRITE)
461 n = 1;
462 else {
463 n = fs->secpertrack - fs->req_sector + 1;
464 if (n > blk_rq_cur_sectors(req))
465 n = blk_rq_cur_sectors(req);
466 }
467
468 swim3_dbg(" setup xfer at sect %d (of %d) head %d for %d\n",
469 fs->req_sector, fs->secpertrack, fs->head, n);
470
471 fs->scount = n;
472 swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
473 out_8(&sw->sector, fs->req_sector);
474 out_8(&sw->nsect, n);
475 out_8(&sw->gap3, 0);
476 out_le32(&dr->cmdptr, virt_to_bus(cp));
477 if (rq_data_dir(req) == WRITE) {
478 /* Set up 3 dma commands: write preamble, data, postamble */
479 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
480 ++cp;
481 init_dma(cp, OUTPUT_MORE, req->buffer, 512);
482 ++cp;
483 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
484 } else {
485 init_dma(cp, INPUT_LAST, req->buffer, n * 512);
486 }
487 ++cp;
488 out_le16(&cp->command, DBDMA_STOP);
489 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
490 in_8(&sw->error);
491 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
492 if (rq_data_dir(req) == WRITE)
493 out_8(&sw->control_bis, WRITE_SECTORS);
494 in_8(&sw->intr);
495 out_le32(&dr->control, (RUN << 16) | RUN);
496 /* enable intr when transfer complete */
497 out_8(&sw->intr_enable, TRANSFER_DONE);
498 out_8(&sw->control_bis, DO_ACTION);
499 set_timeout(fs, 2*HZ, xfer_timeout); /* enable timeout */
500 }
501
502 static void act(struct floppy_state *fs)
503 {
504 for (;;) {
505 swim3_dbg(" act loop, state=%d, req_cyl=%d, cur_cyl=%d\n",
506 fs->state, fs->req_cyl, fs->cur_cyl);
507
508 switch (fs->state) {
509 case idle:
510 return; /* XXX shouldn't get here */
511
512 case locating:
513 if (swim3_readbit(fs, TRACK_ZERO)) {
514 swim3_dbg("%s", " locate track 0\n");
515 fs->cur_cyl = 0;
516 if (fs->req_cyl == 0)
517 fs->state = do_transfer;
518 else
519 fs->state = seeking;
520 break;
521 }
522 scan_track(fs);
523 return;
524
525 case seeking:
526 if (fs->cur_cyl < 0) {
527 fs->expect_cyl = -1;
528 fs->state = locating;
529 break;
530 }
531 if (fs->req_cyl == fs->cur_cyl) {
532 swim3_warn("%s", "Whoops, seeking 0\n");
533 fs->state = do_transfer;
534 break;
535 }
536 seek_track(fs, fs->req_cyl - fs->cur_cyl);
537 return;
538
539 case settling:
540 /* check for SEEK_COMPLETE after 30ms */
541 fs->settle_time = (HZ + 32) / 33;
542 set_timeout(fs, fs->settle_time, settle_timeout);
543 return;
544
545 case do_transfer:
546 if (fs->cur_cyl != fs->req_cyl) {
547 if (fs->retries > 5) {
548 swim3_err("Wrong cylinder in transfer, want: %d got %d\n",
549 fs->req_cyl, fs->cur_cyl);
550 swim3_end_request(fs, -EIO, 0);
551 fs->state = idle;
552 return;
553 }
554 fs->state = seeking;
555 break;
556 }
557 setup_transfer(fs);
558 return;
559
560 case jogging:
561 seek_track(fs, -5);
562 return;
563
564 default:
565 swim3_err("Unknown state %d\n", fs->state);
566 return;
567 }
568 }
569 }
570
571 static void scan_timeout(unsigned long data)
572 {
573 struct floppy_state *fs = (struct floppy_state *) data;
574 struct swim3 __iomem *sw = fs->swim3;
575 unsigned long flags;
576
577 swim3_dbg("* scan timeout, state=%d\n", fs->state);
578
579 spin_lock_irqsave(&swim3_lock, flags);
580 fs->timeout_pending = 0;
581 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
582 out_8(&sw->select, RELAX);
583 out_8(&sw->intr_enable, 0);
584 fs->cur_cyl = -1;
585 if (fs->retries > 5) {
586 swim3_end_request(fs, -EIO, 0);
587 fs->state = idle;
588 start_request(fs);
589 } else {
590 fs->state = jogging;
591 act(fs);
592 }
593 spin_unlock_irqrestore(&swim3_lock, flags);
594 }
595
596 static void seek_timeout(unsigned long data)
597 {
598 struct floppy_state *fs = (struct floppy_state *) data;
599 struct swim3 __iomem *sw = fs->swim3;
600 unsigned long flags;
601
602 swim3_dbg("* seek timeout, state=%d\n", fs->state);
603
604 spin_lock_irqsave(&swim3_lock, flags);
605 fs->timeout_pending = 0;
606 out_8(&sw->control_bic, DO_SEEK);
607 out_8(&sw->select, RELAX);
608 out_8(&sw->intr_enable, 0);
609 swim3_err("%s", "Seek timeout\n");
610 swim3_end_request(fs, -EIO, 0);
611 fs->state = idle;
612 start_request(fs);
613 spin_unlock_irqrestore(&swim3_lock, flags);
614 }
615
616 static void settle_timeout(unsigned long data)
617 {
618 struct floppy_state *fs = (struct floppy_state *) data;
619 struct swim3 __iomem *sw = fs->swim3;
620 unsigned long flags;
621
622 swim3_dbg("* settle timeout, state=%d\n", fs->state);
623
624 spin_lock_irqsave(&swim3_lock, flags);
625 fs->timeout_pending = 0;
626 if (swim3_readbit(fs, SEEK_COMPLETE)) {
627 out_8(&sw->select, RELAX);
628 fs->state = locating;
629 act(fs);
630 goto unlock;
631 }
632 out_8(&sw->select, RELAX);
633 if (fs->settle_time < 2*HZ) {
634 ++fs->settle_time;
635 set_timeout(fs, 1, settle_timeout);
636 goto unlock;
637 }
638 swim3_err("%s", "Seek settle timeout\n");
639 swim3_end_request(fs, -EIO, 0);
640 fs->state = idle;
641 start_request(fs);
642 unlock:
643 spin_unlock_irqrestore(&swim3_lock, flags);
644 }
645
646 static void xfer_timeout(unsigned long data)
647 {
648 struct floppy_state *fs = (struct floppy_state *) data;
649 struct swim3 __iomem *sw = fs->swim3;
650 struct dbdma_regs __iomem *dr = fs->dma;
651 unsigned long flags;
652 int n;
653
654 swim3_dbg("* xfer timeout, state=%d\n", fs->state);
655
656 spin_lock_irqsave(&swim3_lock, flags);
657 fs->timeout_pending = 0;
658 out_le32(&dr->control, RUN << 16);
659 /* We must wait a bit for dbdma to stop */
660 for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
661 udelay(1);
662 out_8(&sw->intr_enable, 0);
663 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
664 out_8(&sw->select, RELAX);
665 swim3_err("Timeout %sing sector %ld\n",
666 (rq_data_dir(fs->cur_req)==WRITE? "writ": "read"),
667 (long)blk_rq_pos(fs->cur_req));
668 swim3_end_request(fs, -EIO, 0);
669 fs->state = idle;
670 start_request(fs);
671 spin_unlock_irqrestore(&swim3_lock, flags);
672 }
673
674 static irqreturn_t swim3_interrupt(int irq, void *dev_id)
675 {
676 struct floppy_state *fs = (struct floppy_state *) dev_id;
677 struct swim3 __iomem *sw = fs->swim3;
678 int intr, err, n;
679 int stat, resid;
680 struct dbdma_regs __iomem *dr;
681 struct dbdma_cmd *cp;
682 unsigned long flags;
683 struct request *req = fs->cur_req;
684
685 swim3_dbg("* interrupt, state=%d\n", fs->state);
686
687 spin_lock_irqsave(&swim3_lock, flags);
688 intr = in_8(&sw->intr);
689 err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
690 if ((intr & ERROR_INTR) && fs->state != do_transfer)
691 swim3_err("Non-transfer error interrupt: state=%d, dir=%x, intr=%x, err=%x\n",
692 fs->state, rq_data_dir(req), intr, err);
693 switch (fs->state) {
694 case locating:
695 if (intr & SEEN_SECTOR) {
696 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
697 out_8(&sw->select, RELAX);
698 out_8(&sw->intr_enable, 0);
699 del_timer(&fs->timeout);
700 fs->timeout_pending = 0;
701 if (sw->ctrack == 0xff) {
702 swim3_err("%s", "Seen sector but cyl=ff?\n");
703 fs->cur_cyl = -1;
704 if (fs->retries > 5) {
705 swim3_end_request(fs, -EIO, 0);
706 fs->state = idle;
707 start_request(fs);
708 } else {
709 fs->state = jogging;
710 act(fs);
711 }
712 break;
713 }
714 fs->cur_cyl = sw->ctrack;
715 fs->cur_sector = sw->csect;
716 if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
717 swim3_err("Expected cyl %d, got %d\n",
718 fs->expect_cyl, fs->cur_cyl);
719 fs->state = do_transfer;
720 act(fs);
721 }
722 break;
723 case seeking:
724 case jogging:
725 if (sw->nseek == 0) {
726 out_8(&sw->control_bic, DO_SEEK);
727 out_8(&sw->select, RELAX);
728 out_8(&sw->intr_enable, 0);
729 del_timer(&fs->timeout);
730 fs->timeout_pending = 0;
731 if (fs->state == seeking)
732 ++fs->retries;
733 fs->state = settling;
734 act(fs);
735 }
736 break;
737 case settling:
738 out_8(&sw->intr_enable, 0);
739 del_timer(&fs->timeout);
740 fs->timeout_pending = 0;
741 act(fs);
742 break;
743 case do_transfer:
744 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
745 break;
746 out_8(&sw->intr_enable, 0);
747 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
748 out_8(&sw->select, RELAX);
749 del_timer(&fs->timeout);
750 fs->timeout_pending = 0;
751 dr = fs->dma;
752 cp = fs->dma_cmd;
753 if (rq_data_dir(req) == WRITE)
754 ++cp;
755 /*
756 * Check that the main data transfer has finished.
757 * On writing, the swim3 sometimes doesn't use
758 * up all the bytes of the postamble, so we can still
759 * see DMA active here. That doesn't matter as long
760 * as all the sector data has been transferred.
761 */
762 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
763 /* wait a little while for DMA to complete */
764 for (n = 0; n < 100; ++n) {
765 if (cp->xfer_status != 0)
766 break;
767 udelay(1);
768 barrier();
769 }
770 }
771 /* turn off DMA */
772 out_le32(&dr->control, (RUN | PAUSE) << 16);
773 stat = ld_le16(&cp->xfer_status);
774 resid = ld_le16(&cp->res_count);
775 if (intr & ERROR_INTR) {
776 n = fs->scount - 1 - resid / 512;
777 if (n > 0) {
778 blk_update_request(req, 0, n << 9);
779 fs->req_sector += n;
780 }
781 if (fs->retries < 5) {
782 ++fs->retries;
783 act(fs);
784 } else {
785 swim3_err("Error %sing block %ld (err=%x)\n",
786 rq_data_dir(req) == WRITE? "writ": "read",
787 (long)blk_rq_pos(req), err);
788 swim3_end_request(fs, -EIO, 0);
789 fs->state = idle;
790 }
791 } else {
792 if ((stat & ACTIVE) == 0 || resid != 0) {
793 /* musta been an error */
794 swim3_err("fd dma error: stat=%x resid=%d\n", stat, resid);
795 swim3_err(" state=%d, dir=%x, intr=%x, err=%x\n",
796 fs->state, rq_data_dir(req), intr, err);
797 swim3_end_request(fs, -EIO, 0);
798 fs->state = idle;
799 start_request(fs);
800 break;
801 }
802 fs->retries = 0;
803 if (swim3_end_request(fs, 0, fs->scount << 9)) {
804 fs->req_sector += fs->scount;
805 if (fs->req_sector > fs->secpertrack) {
806 fs->req_sector -= fs->secpertrack;
807 if (++fs->head > 1) {
808 fs->head = 0;
809 ++fs->req_cyl;
810 }
811 }
812 act(fs);
813 } else
814 fs->state = idle;
815 }
816 if (fs->state == idle)
817 start_request(fs);
818 break;
819 default:
820 swim3_err("Don't know what to do in state %d\n", fs->state);
821 }
822 spin_unlock_irqrestore(&swim3_lock, flags);
823 return IRQ_HANDLED;
824 }
825
826 /*
827 static void fd_dma_interrupt(int irq, void *dev_id)
828 {
829 }
830 */
831
832 /* Called under the mutex to grab exclusive access to a drive */
833 static int grab_drive(struct floppy_state *fs, enum swim_state state,
834 int interruptible)
835 {
836 unsigned long flags;
837
838 swim3_dbg("%s", "-> grab drive\n");
839
840 spin_lock_irqsave(&swim3_lock, flags);
841 if (fs->state != idle && fs->state != available) {
842 ++fs->wanted;
843 while (fs->state != available) {
844 spin_unlock_irqrestore(&swim3_lock, flags);
845 if (interruptible && signal_pending(current)) {
846 --fs->wanted;
847 return -EINTR;
848 }
849 interruptible_sleep_on(&fs->wait);
850 spin_lock_irqsave(&swim3_lock, flags);
851 }
852 --fs->wanted;
853 }
854 fs->state = state;
855 spin_unlock_irqrestore(&swim3_lock, flags);
856
857 return 0;
858 }
859
860 static void release_drive(struct floppy_state *fs)
861 {
862 unsigned long flags;
863
864 swim3_dbg("%s", "-> release drive\n");
865
866 spin_lock_irqsave(&swim3_lock, flags);
867 fs->state = idle;
868 start_request(fs);
869 spin_unlock_irqrestore(&swim3_lock, flags);
870 }
871
872 static int fd_eject(struct floppy_state *fs)
873 {
874 int err, n;
875
876 err = grab_drive(fs, ejecting, 1);
877 if (err)
878 return err;
879 swim3_action(fs, EJECT);
880 for (n = 20; n > 0; --n) {
881 if (signal_pending(current)) {
882 err = -EINTR;
883 break;
884 }
885 swim3_select(fs, RELAX);
886 schedule_timeout_interruptible(1);
887 if (swim3_readbit(fs, DISK_IN) == 0)
888 break;
889 }
890 swim3_select(fs, RELAX);
891 udelay(150);
892 fs->ejected = 1;
893 release_drive(fs);
894 return err;
895 }
896
897 static struct floppy_struct floppy_type =
898 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL }; /* 7 1.44MB 3.5" */
899
900 static int floppy_locked_ioctl(struct block_device *bdev, fmode_t mode,
901 unsigned int cmd, unsigned long param)
902 {
903 struct floppy_state *fs = bdev->bd_disk->private_data;
904 int err;
905
906 if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
907 return -EPERM;
908
909 if (fs->mdev->media_bay &&
910 check_media_bay(fs->mdev->media_bay) != MB_FD)
911 return -ENXIO;
912
913 switch (cmd) {
914 case FDEJECT:
915 if (fs->ref_count != 1)
916 return -EBUSY;
917 err = fd_eject(fs);
918 return err;
919 case FDGETPRM:
920 if (copy_to_user((void __user *) param, &floppy_type,
921 sizeof(struct floppy_struct)))
922 return -EFAULT;
923 return 0;
924 }
925 return -ENOTTY;
926 }
927
928 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
929 unsigned int cmd, unsigned long param)
930 {
931 int ret;
932
933 mutex_lock(&swim3_mutex);
934 ret = floppy_locked_ioctl(bdev, mode, cmd, param);
935 mutex_unlock(&swim3_mutex);
936
937 return ret;
938 }
939
940 static int floppy_open(struct block_device *bdev, fmode_t mode)
941 {
942 struct floppy_state *fs = bdev->bd_disk->private_data;
943 struct swim3 __iomem *sw = fs->swim3;
944 int n, err = 0;
945
946 if (fs->ref_count == 0) {
947 if (fs->mdev->media_bay &&
948 check_media_bay(fs->mdev->media_bay) != MB_FD)
949 return -ENXIO;
950 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
951 out_8(&sw->control_bic, 0xff);
952 out_8(&sw->mode, 0x95);
953 udelay(10);
954 out_8(&sw->intr_enable, 0);
955 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
956 swim3_action(fs, MOTOR_ON);
957 fs->write_prot = -1;
958 fs->cur_cyl = -1;
959 for (n = 0; n < 2 * HZ; ++n) {
960 if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
961 break;
962 if (signal_pending(current)) {
963 err = -EINTR;
964 break;
965 }
966 swim3_select(fs, RELAX);
967 schedule_timeout_interruptible(1);
968 }
969 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
970 || swim3_readbit(fs, DISK_IN) == 0))
971 err = -ENXIO;
972 swim3_action(fs, SETMFM);
973 swim3_select(fs, RELAX);
974
975 } else if (fs->ref_count == -1 || mode & FMODE_EXCL)
976 return -EBUSY;
977
978 if (err == 0 && (mode & FMODE_NDELAY) == 0
979 && (mode & (FMODE_READ|FMODE_WRITE))) {
980 check_disk_change(bdev);
981 if (fs->ejected)
982 err = -ENXIO;
983 }
984
985 if (err == 0 && (mode & FMODE_WRITE)) {
986 if (fs->write_prot < 0)
987 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
988 if (fs->write_prot)
989 err = -EROFS;
990 }
991
992 if (err) {
993 if (fs->ref_count == 0) {
994 swim3_action(fs, MOTOR_OFF);
995 out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
996 swim3_select(fs, RELAX);
997 }
998 return err;
999 }
1000
1001 if (mode & FMODE_EXCL)
1002 fs->ref_count = -1;
1003 else
1004 ++fs->ref_count;
1005
1006 return 0;
1007 }
1008
1009 static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
1010 {
1011 int ret;
1012
1013 mutex_lock(&swim3_mutex);
1014 ret = floppy_open(bdev, mode);
1015 mutex_unlock(&swim3_mutex);
1016
1017 return ret;
1018 }
1019
1020 static int floppy_release(struct gendisk *disk, fmode_t mode)
1021 {
1022 struct floppy_state *fs = disk->private_data;
1023 struct swim3 __iomem *sw = fs->swim3;
1024
1025 mutex_lock(&swim3_mutex);
1026 if (fs->ref_count > 0 && --fs->ref_count == 0) {
1027 swim3_action(fs, MOTOR_OFF);
1028 out_8(&sw->control_bic, 0xff);
1029 swim3_select(fs, RELAX);
1030 }
1031 mutex_unlock(&swim3_mutex);
1032 return 0;
1033 }
1034
1035 static unsigned int floppy_check_events(struct gendisk *disk,
1036 unsigned int clearing)
1037 {
1038 struct floppy_state *fs = disk->private_data;
1039 return fs->ejected ? DISK_EVENT_MEDIA_CHANGE : 0;
1040 }
1041
1042 static int floppy_revalidate(struct gendisk *disk)
1043 {
1044 struct floppy_state *fs = disk->private_data;
1045 struct swim3 __iomem *sw;
1046 int ret, n;
1047
1048 if (fs->mdev->media_bay &&
1049 check_media_bay(fs->mdev->media_bay) != MB_FD)
1050 return -ENXIO;
1051
1052 sw = fs->swim3;
1053 grab_drive(fs, revalidating, 0);
1054 out_8(&sw->intr_enable, 0);
1055 out_8(&sw->control_bis, DRIVE_ENABLE);
1056 swim3_action(fs, MOTOR_ON); /* necessary? */
1057 fs->write_prot = -1;
1058 fs->cur_cyl = -1;
1059 mdelay(1);
1060 for (n = HZ; n > 0; --n) {
1061 if (swim3_readbit(fs, SEEK_COMPLETE))
1062 break;
1063 if (signal_pending(current))
1064 break;
1065 swim3_select(fs, RELAX);
1066 schedule_timeout_interruptible(1);
1067 }
1068 ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
1069 || swim3_readbit(fs, DISK_IN) == 0;
1070 if (ret)
1071 swim3_action(fs, MOTOR_OFF);
1072 else {
1073 fs->ejected = 0;
1074 swim3_action(fs, SETMFM);
1075 }
1076 swim3_select(fs, RELAX);
1077
1078 release_drive(fs);
1079 return ret;
1080 }
1081
1082 static const struct block_device_operations floppy_fops = {
1083 .open = floppy_unlocked_open,
1084 .release = floppy_release,
1085 .ioctl = floppy_ioctl,
1086 .check_events = floppy_check_events,
1087 .revalidate_disk= floppy_revalidate,
1088 };
1089
1090 static void swim3_mb_event(struct macio_dev* mdev, int mb_state)
1091 {
1092 struct floppy_state *fs = macio_get_drvdata(mdev);
1093 struct swim3 __iomem *sw = fs->swim3;
1094
1095 if (!fs)
1096 return;
1097 if (mb_state != MB_FD)
1098 return;
1099
1100 /* Clear state */
1101 out_8(&sw->intr_enable, 0);
1102 in_8(&sw->intr);
1103 in_8(&sw->error);
1104 }
1105
1106 static int swim3_add_device(struct macio_dev *mdev, int index)
1107 {
1108 struct device_node *swim = mdev->ofdev.dev.of_node;
1109 struct floppy_state *fs = &floppy_states[index];
1110 int rc = -EBUSY;
1111
1112 /* Do this first for message macros */
1113 memset(fs, 0, sizeof(*fs));
1114 fs->mdev = mdev;
1115 fs->index = index;
1116
1117 /* Check & Request resources */
1118 if (macio_resource_count(mdev) < 2) {
1119 swim3_err("%s", "No address in device-tree\n");
1120 return -ENXIO;
1121 }
1122 if (macio_irq_count(mdev) < 1) {
1123 swim3_err("%s", "No interrupt in device-tree\n");
1124 return -ENXIO;
1125 }
1126 if (macio_request_resource(mdev, 0, "swim3 (mmio)")) {
1127 swim3_err("%s", "Can't request mmio resource\n");
1128 return -EBUSY;
1129 }
1130 if (macio_request_resource(mdev, 1, "swim3 (dma)")) {
1131 swim3_err("%s", "Can't request dma resource\n");
1132 macio_release_resource(mdev, 0);
1133 return -EBUSY;
1134 }
1135 dev_set_drvdata(&mdev->ofdev.dev, fs);
1136
1137 if (mdev->media_bay == NULL)
1138 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1139
1140 fs->state = idle;
1141 fs->swim3 = (struct swim3 __iomem *)
1142 ioremap(macio_resource_start(mdev, 0), 0x200);
1143 if (fs->swim3 == NULL) {
1144 swim3_err("%s", "Couldn't map mmio registers\n");
1145 rc = -ENOMEM;
1146 goto out_release;
1147 }
1148 fs->dma = (struct dbdma_regs __iomem *)
1149 ioremap(macio_resource_start(mdev, 1), 0x200);
1150 if (fs->dma == NULL) {
1151 swim3_err("%s", "Couldn't map dma registers\n");
1152 iounmap(fs->swim3);
1153 rc = -ENOMEM;
1154 goto out_release;
1155 }
1156 fs->swim3_intr = macio_irq(mdev, 0);
1157 fs->dma_intr = macio_irq(mdev, 1);
1158 fs->cur_cyl = -1;
1159 fs->cur_sector = -1;
1160 fs->secpercyl = 36;
1161 fs->secpertrack = 18;
1162 fs->total_secs = 2880;
1163 init_waitqueue_head(&fs->wait);
1164
1165 fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1166 memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1167 st_le16(&fs->dma_cmd[1].command, DBDMA_STOP);
1168
1169 if (mdev->media_bay == NULL || check_media_bay(mdev->media_bay) == MB_FD)
1170 swim3_mb_event(mdev, MB_FD);
1171
1172 if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1173 swim3_err("%s", "Couldn't request interrupt\n");
1174 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1175 goto out_unmap;
1176 return -EBUSY;
1177 }
1178
1179 init_timer(&fs->timeout);
1180
1181 swim3_info("SWIM3 floppy controller %s\n",
1182 mdev->media_bay ? "in media bay" : "");
1183
1184 return 0;
1185
1186 out_unmap:
1187 iounmap(fs->dma);
1188 iounmap(fs->swim3);
1189
1190 out_release:
1191 macio_release_resource(mdev, 0);
1192 macio_release_resource(mdev, 1);
1193
1194 return rc;
1195 }
1196
1197 static int __devinit swim3_attach(struct macio_dev *mdev, const struct of_device_id *match)
1198 {
1199 struct gendisk *disk;
1200 int index, rc;
1201
1202 index = floppy_count++;
1203 if (index >= MAX_FLOPPIES)
1204 return -ENXIO;
1205
1206 /* Add the drive */
1207 rc = swim3_add_device(mdev, index);
1208 if (rc)
1209 return rc;
1210 /* Now register that disk. Same comment about failure handling */
1211 disk = disks[index] = alloc_disk(1);
1212 if (disk == NULL)
1213 return -ENOMEM;
1214 disk->queue = blk_init_queue(do_fd_request, &swim3_lock);
1215 if (disk->queue == NULL) {
1216 put_disk(disk);
1217 return -ENOMEM;
1218 }
1219 disk->queue->queuedata = &floppy_states[index];
1220
1221 if (index == 0) {
1222 /* If we failed, there isn't much we can do as the driver is still
1223 * too dumb to remove the device, just bail out
1224 */
1225 if (register_blkdev(FLOPPY_MAJOR, "fd"))
1226 return 0;
1227 }
1228
1229 disk->major = FLOPPY_MAJOR;
1230 disk->first_minor = index;
1231 disk->fops = &floppy_fops;
1232 disk->private_data = &floppy_states[index];
1233 disk->flags |= GENHD_FL_REMOVABLE;
1234 sprintf(disk->disk_name, "fd%d", index);
1235 set_capacity(disk, 2880);
1236 add_disk(disk);
1237
1238 return 0;
1239 }
1240
1241 static struct of_device_id swim3_match[] =
1242 {
1243 {
1244 .name = "swim3",
1245 },
1246 {
1247 .compatible = "ohare-swim3"
1248 },
1249 {
1250 .compatible = "swim3"
1251 },
1252 { /* end of list */ }
1253 };
1254
1255 static struct macio_driver swim3_driver =
1256 {
1257 .driver = {
1258 .name = "swim3",
1259 .of_match_table = swim3_match,
1260 },
1261 .probe = swim3_attach,
1262 #ifdef CONFIG_PMAC_MEDIABAY
1263 .mediabay_event = swim3_mb_event,
1264 #endif
1265 #if 0
1266 .suspend = swim3_suspend,
1267 .resume = swim3_resume,
1268 #endif
1269 };
1270
1271
1272 int swim3_init(void)
1273 {
1274 macio_register_driver(&swim3_driver);
1275 return 0;
1276 }
1277
1278 module_init(swim3_init)
1279
1280 MODULE_LICENSE("GPL");
1281 MODULE_AUTHOR("Paul Mackerras");
1282 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);