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Linux 4.2.1
[linux/fpc-iii.git] / drivers / block / swim3.c
blobc264f2d284a7be338caa7513a94e21c5bbc6d3de
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 <linux/wait.h>
34 #include <asm/io.h>
35 #include <asm/dbdma.h>
36 #include <asm/prom.h>
37 #include <asm/uaccess.h>
38 #include <asm/mediabay.h>
39 #include <asm/machdep.h>
40 #include <asm/pmac_feature.h>
41
42 #define MAX_FLOPPIES 2
43
44 static DEFINE_MUTEX(swim3_mutex);
45 static struct gendisk *disks[MAX_FLOPPIES];
46
47 enum swim_state {
48 idle,
49 locating,
50 seeking,
51 settling,
52 do_transfer,
53 jogging,
54 available,
55 revalidating,
56 ejecting
57 };
58
59 #define REG(x) unsigned char x; char x ## _pad[15];
60
61 /*
62 * The names for these registers mostly represent speculation on my part.
63 * It will be interesting to see how close they are to the names Apple uses.
64 */
65 struct swim3 {
66 REG(data);
67 REG(timer); /* counts down at 1MHz */
68 REG(error);
69 REG(mode);
70 REG(select); /* controls CA0, CA1, CA2 and LSTRB signals */
71 REG(setup);
72 REG(control); /* writing bits clears them */
73 REG(status); /* writing bits sets them in control */
74 REG(intr);
75 REG(nseek); /* # tracks to seek */
76 REG(ctrack); /* current track number */
77 REG(csect); /* current sector number */
78 REG(gap3); /* size of gap 3 in track format */
79 REG(sector); /* sector # to read or write */
80 REG(nsect); /* # sectors to read or write */
81 REG(intr_enable);
82 };
83
84 #define control_bic control
85 #define control_bis status
86
87 /* Bits in select register */
88 #define CA_MASK 7
89 #define LSTRB 8
90
91 /* Bits in control register */
92 #define DO_SEEK 0x80
93 #define FORMAT 0x40
94 #define SELECT 0x20
95 #define WRITE_SECTORS 0x10
96 #define DO_ACTION 0x08
97 #define DRIVE2_ENABLE 0x04
98 #define DRIVE_ENABLE 0x02
99 #define INTR_ENABLE 0x01
100
101 /* Bits in status register */
102 #define FIFO_1BYTE 0x80
103 #define FIFO_2BYTE 0x40
104 #define ERROR 0x20
105 #define DATA 0x08
106 #define RDDATA 0x04
107 #define INTR_PENDING 0x02
108 #define MARK_BYTE 0x01
109
110 /* Bits in intr and intr_enable registers */
111 #define ERROR_INTR 0x20
112 #define DATA_CHANGED 0x10
113 #define TRANSFER_DONE 0x08
114 #define SEEN_SECTOR 0x04
115 #define SEEK_DONE 0x02
116 #define TIMER_DONE 0x01
117
118 /* Bits in error register */
119 #define ERR_DATA_CRC 0x80
120 #define ERR_ADDR_CRC 0x40
121 #define ERR_OVERRUN 0x04
122 #define ERR_UNDERRUN 0x01
123
124 /* Bits in setup register */
125 #define S_SW_RESET 0x80
126 #define S_GCR_WRITE 0x40
127 #define S_IBM_DRIVE 0x20
128 #define S_TEST_MODE 0x10
129 #define S_FCLK_DIV2 0x08
130 #define S_GCR 0x04
131 #define S_COPY_PROT 0x02
132 #define S_INV_WDATA 0x01
133
134 /* Select values for swim3_action */
135 #define SEEK_POSITIVE 0
136 #define SEEK_NEGATIVE 4
137 #define STEP 1
138 #define MOTOR_ON 2
139 #define MOTOR_OFF 6
140 #define INDEX 3
141 #define EJECT 7
142 #define SETMFM 9
143 #define SETGCR 13
144
145 /* Select values for swim3_select and swim3_readbit */
146 #define STEP_DIR 0
147 #define STEPPING 1
148 #define MOTOR_ON 2
149 #define RELAX 3 /* also eject in progress */
150 #define READ_DATA_0 4
151 #define TWOMEG_DRIVE 5
152 #define SINGLE_SIDED 6 /* drive or diskette is 4MB type? */
153 #define DRIVE_PRESENT 7
154 #define DISK_IN 8
155 #define WRITE_PROT 9
156 #define TRACK_ZERO 10
157 #define TACHO 11
158 #define READ_DATA_1 12
159 #define MFM_MODE 13
160 #define SEEK_COMPLETE 14
161 #define ONEMEG_MEDIA 15
162
163 /* Definitions of values used in writing and formatting */
164 #define DATA_ESCAPE 0x99
165 #define GCR_SYNC_EXC 0x3f
166 #define GCR_SYNC_CONV 0x80
167 #define GCR_FIRST_MARK 0xd5
168 #define GCR_SECOND_MARK 0xaa
169 #define GCR_ADDR_MARK "\xd5\xaa\x00"
170 #define GCR_DATA_MARK "\xd5\xaa\x0b"
171 #define GCR_SLIP_BYTE "\x27\xaa"
172 #define GCR_SELF_SYNC "\x3f\xbf\x1e\x34\x3c\x3f"
173
174 #define DATA_99 "\x99\x99"
175 #define MFM_ADDR_MARK "\x99\xa1\x99\xa1\x99\xa1\x99\xfe"
176 #define MFM_INDEX_MARK "\x99\xc2\x99\xc2\x99\xc2\x99\xfc"
177 #define MFM_GAP_LEN 12
178
179 struct floppy_state {
180 enum swim_state state;
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 macio_dev *mdev;
206 char dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)];
207 int index;
208 struct request *cur_req;
209 };
210
211 #define swim3_err(fmt, arg...) dev_err(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
212 #define swim3_warn(fmt, arg...) dev_warn(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
213 #define swim3_info(fmt, arg...) dev_info(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
214
215 #ifdef DEBUG
216 #define swim3_dbg(fmt, arg...) dev_dbg(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
217 #else
218 #define swim3_dbg(fmt, arg...) do { } while(0)
219 #endif
220
221 static struct floppy_state floppy_states[MAX_FLOPPIES];
222 static int floppy_count = 0;
223 static DEFINE_SPINLOCK(swim3_lock);
224
225 static unsigned short write_preamble[] = {
226 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */
227 0, 0, 0, 0, 0, 0, /* sync field */
228 0x99a1, 0x99a1, 0x99a1, 0x99fb, /* data address mark */
229 0x990f /* no escape for 512 bytes */
230 };
231
232 static unsigned short write_postamble[] = {
233 0x9904, /* insert CRC */
234 0x4e4e, 0x4e4e,
235 0x9908, /* stop writing */
236 0, 0, 0, 0, 0, 0
237 };
238
239 static void seek_track(struct floppy_state *fs, int n);
240 static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count);
241 static void act(struct floppy_state *fs);
242 static void scan_timeout(unsigned long data);
243 static void seek_timeout(unsigned long data);
244 static void settle_timeout(unsigned long data);
245 static void xfer_timeout(unsigned long data);
246 static irqreturn_t swim3_interrupt(int irq, void *dev_id);
247 /*static void fd_dma_interrupt(int irq, void *dev_id);*/
248 static int grab_drive(struct floppy_state *fs, enum swim_state state,
249 int interruptible);
250 static void release_drive(struct floppy_state *fs);
251 static int fd_eject(struct floppy_state *fs);
252 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
253 unsigned int cmd, unsigned long param);
254 static int floppy_open(struct block_device *bdev, fmode_t mode);
255 static void floppy_release(struct gendisk *disk, fmode_t mode);
256 static unsigned int floppy_check_events(struct gendisk *disk,
257 unsigned int clearing);
258 static int floppy_revalidate(struct gendisk *disk);
259
260 static bool swim3_end_request(struct floppy_state *fs, int err, unsigned int nr_bytes)
261 {
262 struct request *req = fs->cur_req;
263 int rc;
264
265 swim3_dbg(" end request, err=%d nr_bytes=%d, cur_req=%p\n",
266 err, nr_bytes, req);
267
268 if (err)
269 nr_bytes = blk_rq_cur_bytes(req);
270 rc = __blk_end_request(req, err, nr_bytes);
271 if (rc)
272 return true;
273 fs->cur_req = NULL;
274 return false;
275 }
276
277 static void swim3_select(struct floppy_state *fs, int sel)
278 {
279 struct swim3 __iomem *sw = fs->swim3;
280
281 out_8(&sw->select, RELAX);
282 if (sel & 8)
283 out_8(&sw->control_bis, SELECT);
284 else
285 out_8(&sw->control_bic, SELECT);
286 out_8(&sw->select, sel & CA_MASK);
287 }
288
289 static void swim3_action(struct floppy_state *fs, int action)
290 {
291 struct swim3 __iomem *sw = fs->swim3;
292
293 swim3_select(fs, action);
294 udelay(1);
295 out_8(&sw->select, sw->select | LSTRB);
296 udelay(2);
297 out_8(&sw->select, sw->select & ~LSTRB);
298 udelay(1);
299 }
300
301 static int swim3_readbit(struct floppy_state *fs, int bit)
302 {
303 struct swim3 __iomem *sw = fs->swim3;
304 int stat;
305
306 swim3_select(fs, bit);
307 udelay(1);
308 stat = in_8(&sw->status);
309 return (stat & DATA) == 0;
310 }
311
312 static void start_request(struct floppy_state *fs)
313 {
314 struct request *req;
315 unsigned long x;
316
317 swim3_dbg("start request, initial state=%d\n", fs->state);
318
319 if (fs->state == idle && fs->wanted) {
320 fs->state = available;
321 wake_up(&fs->wait);
322 return;
323 }
324 while (fs->state == idle) {
325 swim3_dbg("start request, idle loop, cur_req=%p\n", fs->cur_req);
326 if (!fs->cur_req) {
327 fs->cur_req = blk_fetch_request(disks[fs->index]->queue);
328 swim3_dbg(" fetched request %p\n", fs->cur_req);
329 if (!fs->cur_req)
330 break;
331 }
332 req = fs->cur_req;
333
334 if (fs->mdev->media_bay &&
335 check_media_bay(fs->mdev->media_bay) != MB_FD) {
336 swim3_dbg("%s", " media bay absent, dropping req\n");
337 swim3_end_request(fs, -ENODEV, 0);
338 continue;
339 }
340
341 #if 0 /* This is really too verbose */
342 swim3_dbg("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%u buf=%p\n",
343 req->rq_disk->disk_name, req->cmd,
344 (long)blk_rq_pos(req), blk_rq_sectors(req),
345 bio_data(req->bio));
346 swim3_dbg(" errors=%d current_nr_sectors=%u\n",
347 req->errors, blk_rq_cur_sectors(req));
348 #endif
349
350 if (blk_rq_pos(req) >= fs->total_secs) {
351 swim3_dbg(" pos out of bounds (%ld, max is %ld)\n",
352 (long)blk_rq_pos(req), (long)fs->total_secs);
353 swim3_end_request(fs, -EIO, 0);
354 continue;
355 }
356 if (fs->ejected) {
357 swim3_dbg("%s", " disk ejected\n");
358 swim3_end_request(fs, -EIO, 0);
359 continue;
360 }
361
362 if (rq_data_dir(req) == WRITE) {
363 if (fs->write_prot < 0)
364 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
365 if (fs->write_prot) {
366 swim3_dbg("%s", " try to write, disk write protected\n");
367 swim3_end_request(fs, -EIO, 0);
368 continue;
369 }
370 }
371
372 /* Do not remove the cast. blk_rq_pos(req) is now a
373 * sector_t and can be 64 bits, but it will never go
374 * past 32 bits for this driver anyway, so we can
375 * safely cast it down and not have to do a 64/32
376 * division
377 */
378 fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl;
379 x = ((long)blk_rq_pos(req)) % fs->secpercyl;
380 fs->head = x / fs->secpertrack;
381 fs->req_sector = x % fs->secpertrack + 1;
382 fs->state = do_transfer;
383 fs->retries = 0;
384
385 act(fs);
386 }
387 }
388
389 static void do_fd_request(struct request_queue * q)
390 {
391 start_request(q->queuedata);
392 }
393
394 static void set_timeout(struct floppy_state *fs, int nticks,
395 void (*proc)(unsigned long))
396 {
397 if (fs->timeout_pending)
398 del_timer(&fs->timeout);
399 fs->timeout.expires = jiffies + nticks;
400 fs->timeout.function = proc;
401 fs->timeout.data = (unsigned long) fs;
402 add_timer(&fs->timeout);
403 fs->timeout_pending = 1;
404 }
405
406 static inline void scan_track(struct floppy_state *fs)
407 {
408 struct swim3 __iomem *sw = fs->swim3;
409
410 swim3_select(fs, READ_DATA_0);
411 in_8(&sw->intr); /* clear SEEN_SECTOR bit */
412 in_8(&sw->error);
413 out_8(&sw->intr_enable, SEEN_SECTOR);
414 out_8(&sw->control_bis, DO_ACTION);
415 /* enable intr when track found */
416 set_timeout(fs, HZ, scan_timeout); /* enable timeout */
417 }
418
419 static inline void seek_track(struct floppy_state *fs, int n)
420 {
421 struct swim3 __iomem *sw = fs->swim3;
422
423 if (n >= 0) {
424 swim3_action(fs, SEEK_POSITIVE);
425 sw->nseek = n;
426 } else {
427 swim3_action(fs, SEEK_NEGATIVE);
428 sw->nseek = -n;
429 }
430 fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
431 swim3_select(fs, STEP);
432 in_8(&sw->error);
433 /* enable intr when seek finished */
434 out_8(&sw->intr_enable, SEEK_DONE);
435 out_8(&sw->control_bis, DO_SEEK);
436 set_timeout(fs, 3*HZ, seek_timeout); /* enable timeout */
437 fs->settle_time = 0;
438 }
439
440 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
441 void *buf, int count)
442 {
443 cp->req_count = cpu_to_le16(count);
444 cp->command = cpu_to_le16(cmd);
445 cp->phy_addr = cpu_to_le32(virt_to_bus(buf));
446 cp->xfer_status = 0;
447 }
448
449 static inline void setup_transfer(struct floppy_state *fs)
450 {
451 int n;
452 struct swim3 __iomem *sw = fs->swim3;
453 struct dbdma_cmd *cp = fs->dma_cmd;
454 struct dbdma_regs __iomem *dr = fs->dma;
455 struct request *req = fs->cur_req;
456
457 if (blk_rq_cur_sectors(req) <= 0) {
458 swim3_warn("%s", "Transfer 0 sectors ?\n");
459 return;
460 }
461 if (rq_data_dir(req) == WRITE)
462 n = 1;
463 else {
464 n = fs->secpertrack - fs->req_sector + 1;
465 if (n > blk_rq_cur_sectors(req))
466 n = blk_rq_cur_sectors(req);
467 }
468
469 swim3_dbg(" setup xfer at sect %d (of %d) head %d for %d\n",
470 fs->req_sector, fs->secpertrack, fs->head, n);
471
472 fs->scount = n;
473 swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
474 out_8(&sw->sector, fs->req_sector);
475 out_8(&sw->nsect, n);
476 out_8(&sw->gap3, 0);
477 out_le32(&dr->cmdptr, virt_to_bus(cp));
478 if (rq_data_dir(req) == WRITE) {
479 /* Set up 3 dma commands: write preamble, data, postamble */
480 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
481 ++cp;
482 init_dma(cp, OUTPUT_MORE, bio_data(req->bio), 512);
483 ++cp;
484 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
485 } else {
486 init_dma(cp, INPUT_LAST, bio_data(req->bio), n * 512);
487 }
488 ++cp;
489 out_le16(&cp->command, DBDMA_STOP);
490 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
491 in_8(&sw->error);
492 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
493 if (rq_data_dir(req) == WRITE)
494 out_8(&sw->control_bis, WRITE_SECTORS);
495 in_8(&sw->intr);
496 out_le32(&dr->control, (RUN << 16) | RUN);
497 /* enable intr when transfer complete */
498 out_8(&sw->intr_enable, TRANSFER_DONE);
499 out_8(&sw->control_bis, DO_ACTION);
500 set_timeout(fs, 2*HZ, xfer_timeout); /* enable timeout */
501 }
502
503 static void act(struct floppy_state *fs)
504 {
505 for (;;) {
506 swim3_dbg(" act loop, state=%d, req_cyl=%d, cur_cyl=%d\n",
507 fs->state, fs->req_cyl, fs->cur_cyl);
508
509 switch (fs->state) {
510 case idle:
511 return; /* XXX shouldn't get here */
512
513 case locating:
514 if (swim3_readbit(fs, TRACK_ZERO)) {
515 swim3_dbg("%s", " locate track 0\n");
516 fs->cur_cyl = 0;
517 if (fs->req_cyl == 0)
518 fs->state = do_transfer;
519 else
520 fs->state = seeking;
521 break;
522 }
523 scan_track(fs);
524 return;
525
526 case seeking:
527 if (fs->cur_cyl < 0) {
528 fs->expect_cyl = -1;
529 fs->state = locating;
530 break;
531 }
532 if (fs->req_cyl == fs->cur_cyl) {
533 swim3_warn("%s", "Whoops, seeking 0\n");
534 fs->state = do_transfer;
535 break;
536 }
537 seek_track(fs, fs->req_cyl - fs->cur_cyl);
538 return;
539
540 case settling:
541 /* check for SEEK_COMPLETE after 30ms */
542 fs->settle_time = (HZ + 32) / 33;
543 set_timeout(fs, fs->settle_time, settle_timeout);
544 return;
545
546 case do_transfer:
547 if (fs->cur_cyl != fs->req_cyl) {
548 if (fs->retries > 5) {
549 swim3_err("Wrong cylinder in transfer, want: %d got %d\n",
550 fs->req_cyl, fs->cur_cyl);
551 swim3_end_request(fs, -EIO, 0);
552 fs->state = idle;
553 return;
554 }
555 fs->state = seeking;
556 break;
557 }
558 setup_transfer(fs);
559 return;
560
561 case jogging:
562 seek_track(fs, -5);
563 return;
564
565 default:
566 swim3_err("Unknown state %d\n", fs->state);
567 return;
568 }
569 }
570 }
571
572 static void scan_timeout(unsigned long data)
573 {
574 struct floppy_state *fs = (struct floppy_state *) data;
575 struct swim3 __iomem *sw = fs->swim3;
576 unsigned long flags;
577
578 swim3_dbg("* scan timeout, state=%d\n", fs->state);
579
580 spin_lock_irqsave(&swim3_lock, flags);
581 fs->timeout_pending = 0;
582 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
583 out_8(&sw->select, RELAX);
584 out_8(&sw->intr_enable, 0);
585 fs->cur_cyl = -1;
586 if (fs->retries > 5) {
587 swim3_end_request(fs, -EIO, 0);
588 fs->state = idle;
589 start_request(fs);
590 } else {
591 fs->state = jogging;
592 act(fs);
593 }
594 spin_unlock_irqrestore(&swim3_lock, flags);
595 }
596
597 static void seek_timeout(unsigned long data)
598 {
599 struct floppy_state *fs = (struct floppy_state *) data;
600 struct swim3 __iomem *sw = fs->swim3;
601 unsigned long flags;
602
603 swim3_dbg("* seek timeout, state=%d\n", fs->state);
604
605 spin_lock_irqsave(&swim3_lock, flags);
606 fs->timeout_pending = 0;
607 out_8(&sw->control_bic, DO_SEEK);
608 out_8(&sw->select, RELAX);
609 out_8(&sw->intr_enable, 0);
610 swim3_err("%s", "Seek timeout\n");
611 swim3_end_request(fs, -EIO, 0);
612 fs->state = idle;
613 start_request(fs);
614 spin_unlock_irqrestore(&swim3_lock, flags);
615 }
616
617 static void settle_timeout(unsigned long data)
618 {
619 struct floppy_state *fs = (struct floppy_state *) data;
620 struct swim3 __iomem *sw = fs->swim3;
621 unsigned long flags;
622
623 swim3_dbg("* settle timeout, state=%d\n", fs->state);
624
625 spin_lock_irqsave(&swim3_lock, flags);
626 fs->timeout_pending = 0;
627 if (swim3_readbit(fs, SEEK_COMPLETE)) {
628 out_8(&sw->select, RELAX);
629 fs->state = locating;
630 act(fs);
631 goto unlock;
632 }
633 out_8(&sw->select, RELAX);
634 if (fs->settle_time < 2*HZ) {
635 ++fs->settle_time;
636 set_timeout(fs, 1, settle_timeout);
637 goto unlock;
638 }
639 swim3_err("%s", "Seek settle timeout\n");
640 swim3_end_request(fs, -EIO, 0);
641 fs->state = idle;
642 start_request(fs);
643 unlock:
644 spin_unlock_irqrestore(&swim3_lock, flags);
645 }
646
647 static void xfer_timeout(unsigned long data)
648 {
649 struct floppy_state *fs = (struct floppy_state *) data;
650 struct swim3 __iomem *sw = fs->swim3;
651 struct dbdma_regs __iomem *dr = fs->dma;
652 unsigned long flags;
653 int n;
654
655 swim3_dbg("* xfer timeout, state=%d\n", fs->state);
656
657 spin_lock_irqsave(&swim3_lock, flags);
658 fs->timeout_pending = 0;
659 out_le32(&dr->control, RUN << 16);
660 /* We must wait a bit for dbdma to stop */
661 for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
662 udelay(1);
663 out_8(&sw->intr_enable, 0);
664 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
665 out_8(&sw->select, RELAX);
666 swim3_err("Timeout %sing sector %ld\n",
667 (rq_data_dir(fs->cur_req)==WRITE? "writ": "read"),
668 (long)blk_rq_pos(fs->cur_req));
669 swim3_end_request(fs, -EIO, 0);
670 fs->state = idle;
671 start_request(fs);
672 spin_unlock_irqrestore(&swim3_lock, flags);
673 }
674
675 static irqreturn_t swim3_interrupt(int irq, void *dev_id)
676 {
677 struct floppy_state *fs = (struct floppy_state *) dev_id;
678 struct swim3 __iomem *sw = fs->swim3;
679 int intr, err, n;
680 int stat, resid;
681 struct dbdma_regs __iomem *dr;
682 struct dbdma_cmd *cp;
683 unsigned long flags;
684 struct request *req = fs->cur_req;
685
686 swim3_dbg("* interrupt, state=%d\n", fs->state);
687
688 spin_lock_irqsave(&swim3_lock, flags);
689 intr = in_8(&sw->intr);
690 err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
691 if ((intr & ERROR_INTR) && fs->state != do_transfer)
692 swim3_err("Non-transfer error interrupt: state=%d, dir=%x, intr=%x, err=%x\n",
693 fs->state, rq_data_dir(req), intr, err);
694 switch (fs->state) {
695 case locating:
696 if (intr & SEEN_SECTOR) {
697 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
698 out_8(&sw->select, RELAX);
699 out_8(&sw->intr_enable, 0);
700 del_timer(&fs->timeout);
701 fs->timeout_pending = 0;
702 if (sw->ctrack == 0xff) {
703 swim3_err("%s", "Seen sector but cyl=ff?\n");
704 fs->cur_cyl = -1;
705 if (fs->retries > 5) {
706 swim3_end_request(fs, -EIO, 0);
707 fs->state = idle;
708 start_request(fs);
709 } else {
710 fs->state = jogging;
711 act(fs);
712 }
713 break;
714 }
715 fs->cur_cyl = sw->ctrack;
716 fs->cur_sector = sw->csect;
717 if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
718 swim3_err("Expected cyl %d, got %d\n",
719 fs->expect_cyl, fs->cur_cyl);
720 fs->state = do_transfer;
721 act(fs);
722 }
723 break;
724 case seeking:
725 case jogging:
726 if (sw->nseek == 0) {
727 out_8(&sw->control_bic, DO_SEEK);
728 out_8(&sw->select, RELAX);
729 out_8(&sw->intr_enable, 0);
730 del_timer(&fs->timeout);
731 fs->timeout_pending = 0;
732 if (fs->state == seeking)
733 ++fs->retries;
734 fs->state = settling;
735 act(fs);
736 }
737 break;
738 case settling:
739 out_8(&sw->intr_enable, 0);
740 del_timer(&fs->timeout);
741 fs->timeout_pending = 0;
742 act(fs);
743 break;
744 case do_transfer:
745 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
746 break;
747 out_8(&sw->intr_enable, 0);
748 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
749 out_8(&sw->select, RELAX);
750 del_timer(&fs->timeout);
751 fs->timeout_pending = 0;
752 dr = fs->dma;
753 cp = fs->dma_cmd;
754 if (rq_data_dir(req) == WRITE)
755 ++cp;
756 /*
757 * Check that the main data transfer has finished.
758 * On writing, the swim3 sometimes doesn't use
759 * up all the bytes of the postamble, so we can still
760 * see DMA active here. That doesn't matter as long
761 * as all the sector data has been transferred.
762 */
763 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
764 /* wait a little while for DMA to complete */
765 for (n = 0; n < 100; ++n) {
766 if (cp->xfer_status != 0)
767 break;
768 udelay(1);
769 barrier();
770 }
771 }
772 /* turn off DMA */
773 out_le32(&dr->control, (RUN | PAUSE) << 16);
774 stat = le16_to_cpu(cp->xfer_status);
775 resid = le16_to_cpu(cp->res_count);
776 if (intr & ERROR_INTR) {
777 n = fs->scount - 1 - resid / 512;
778 if (n > 0) {
779 blk_update_request(req, 0, n << 9);
780 fs->req_sector += n;
781 }
782 if (fs->retries < 5) {
783 ++fs->retries;
784 act(fs);
785 } else {
786 swim3_err("Error %sing block %ld (err=%x)\n",
787 rq_data_dir(req) == WRITE? "writ": "read",
788 (long)blk_rq_pos(req), err);
789 swim3_end_request(fs, -EIO, 0);
790 fs->state = idle;
791 }
792 } else {
793 if ((stat & ACTIVE) == 0 || resid != 0) {
794 /* musta been an error */
795 swim3_err("fd dma error: stat=%x resid=%d\n", stat, resid);
796 swim3_err(" state=%d, dir=%x, intr=%x, err=%x\n",
797 fs->state, rq_data_dir(req), intr, err);
798 swim3_end_request(fs, -EIO, 0);
799 fs->state = idle;
800 start_request(fs);
801 break;
802 }
803 fs->retries = 0;
804 if (swim3_end_request(fs, 0, fs->scount << 9)) {
805 fs->req_sector += fs->scount;
806 if (fs->req_sector > fs->secpertrack) {
807 fs->req_sector -= fs->secpertrack;
808 if (++fs->head > 1) {
809 fs->head = 0;
810 ++fs->req_cyl;
811 }
812 }
813 act(fs);
814 } else
815 fs->state = idle;
816 }
817 if (fs->state == idle)
818 start_request(fs);
819 break;
820 default:
821 swim3_err("Don't know what to do in state %d\n", fs->state);
822 }
823 spin_unlock_irqrestore(&swim3_lock, flags);
824 return IRQ_HANDLED;
825 }
826
827 /*
828 static void fd_dma_interrupt(int irq, void *dev_id)
829 {
830 }
831 */
832
833 /* Called under the mutex to grab exclusive access to a drive */
834 static int grab_drive(struct floppy_state *fs, enum swim_state state,
835 int interruptible)
836 {
837 unsigned long flags;
838
839 swim3_dbg("%s", "-> grab drive\n");
840
841 spin_lock_irqsave(&swim3_lock, flags);
842 if (fs->state != idle && fs->state != available) {
843 ++fs->wanted;
844 /* this will enable irqs in order to sleep */
845 if (!interruptible)
846 wait_event_lock_irq(fs->wait,
847 fs->state == available,
848 swim3_lock);
849 else if (wait_event_interruptible_lock_irq(fs->wait,
850 fs->state == available,
851 swim3_lock)) {
852 --fs->wanted;
853 spin_unlock_irqrestore(&swim3_lock, flags);
854 return -EINTR;
855 }
856 --fs->wanted;
857 }
858 fs->state = state;
859 spin_unlock_irqrestore(&swim3_lock, flags);
860
861 return 0;
862 }
863
864 static void release_drive(struct floppy_state *fs)
865 {
866 unsigned long flags;
867
868 swim3_dbg("%s", "-> release drive\n");
869
870 spin_lock_irqsave(&swim3_lock, flags);
871 fs->state = idle;
872 start_request(fs);
873 spin_unlock_irqrestore(&swim3_lock, flags);
874 }
875
876 static int fd_eject(struct floppy_state *fs)
877 {
878 int err, n;
879
880 err = grab_drive(fs, ejecting, 1);
881 if (err)
882 return err;
883 swim3_action(fs, EJECT);
884 for (n = 20; n > 0; --n) {
885 if (signal_pending(current)) {
886 err = -EINTR;
887 break;
888 }
889 swim3_select(fs, RELAX);
890 schedule_timeout_interruptible(1);
891 if (swim3_readbit(fs, DISK_IN) == 0)
892 break;
893 }
894 swim3_select(fs, RELAX);
895 udelay(150);
896 fs->ejected = 1;
897 release_drive(fs);
898 return err;
899 }
900
901 static struct floppy_struct floppy_type =
902 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL }; /* 7 1.44MB 3.5" */
903
904 static int floppy_locked_ioctl(struct block_device *bdev, fmode_t mode,
905 unsigned int cmd, unsigned long param)
906 {
907 struct floppy_state *fs = bdev->bd_disk->private_data;
908 int err;
909
910 if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
911 return -EPERM;
912
913 if (fs->mdev->media_bay &&
914 check_media_bay(fs->mdev->media_bay) != MB_FD)
915 return -ENXIO;
916
917 switch (cmd) {
918 case FDEJECT:
919 if (fs->ref_count != 1)
920 return -EBUSY;
921 err = fd_eject(fs);
922 return err;
923 case FDGETPRM:
924 if (copy_to_user((void __user *) param, &floppy_type,
925 sizeof(struct floppy_struct)))
926 return -EFAULT;
927 return 0;
928 }
929 return -ENOTTY;
930 }
931
932 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
933 unsigned int cmd, unsigned long param)
934 {
935 int ret;
936
937 mutex_lock(&swim3_mutex);
938 ret = floppy_locked_ioctl(bdev, mode, cmd, param);
939 mutex_unlock(&swim3_mutex);
940
941 return ret;
942 }
943
944 static int floppy_open(struct block_device *bdev, fmode_t mode)
945 {
946 struct floppy_state *fs = bdev->bd_disk->private_data;
947 struct swim3 __iomem *sw = fs->swim3;
948 int n, err = 0;
949
950 if (fs->ref_count == 0) {
951 if (fs->mdev->media_bay &&
952 check_media_bay(fs->mdev->media_bay) != MB_FD)
953 return -ENXIO;
954 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
955 out_8(&sw->control_bic, 0xff);
956 out_8(&sw->mode, 0x95);
957 udelay(10);
958 out_8(&sw->intr_enable, 0);
959 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
960 swim3_action(fs, MOTOR_ON);
961 fs->write_prot = -1;
962 fs->cur_cyl = -1;
963 for (n = 0; n < 2 * HZ; ++n) {
964 if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
965 break;
966 if (signal_pending(current)) {
967 err = -EINTR;
968 break;
969 }
970 swim3_select(fs, RELAX);
971 schedule_timeout_interruptible(1);
972 }
973 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
974 || swim3_readbit(fs, DISK_IN) == 0))
975 err = -ENXIO;
976 swim3_action(fs, SETMFM);
977 swim3_select(fs, RELAX);
978
979 } else if (fs->ref_count == -1 || mode & FMODE_EXCL)
980 return -EBUSY;
981
982 if (err == 0 && (mode & FMODE_NDELAY) == 0
983 && (mode & (FMODE_READ|FMODE_WRITE))) {
984 check_disk_change(bdev);
985 if (fs->ejected)
986 err = -ENXIO;
987 }
988
989 if (err == 0 && (mode & FMODE_WRITE)) {
990 if (fs->write_prot < 0)
991 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
992 if (fs->write_prot)
993 err = -EROFS;
994 }
995
996 if (err) {
997 if (fs->ref_count == 0) {
998 swim3_action(fs, MOTOR_OFF);
999 out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
1000 swim3_select(fs, RELAX);
1001 }
1002 return err;
1003 }
1004
1005 if (mode & FMODE_EXCL)
1006 fs->ref_count = -1;
1007 else
1008 ++fs->ref_count;
1009
1010 return 0;
1011 }
1012
1013 static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
1014 {
1015 int ret;
1016
1017 mutex_lock(&swim3_mutex);
1018 ret = floppy_open(bdev, mode);
1019 mutex_unlock(&swim3_mutex);
1020
1021 return ret;
1022 }
1023
1024 static void floppy_release(struct gendisk *disk, fmode_t mode)
1025 {
1026 struct floppy_state *fs = disk->private_data;
1027 struct swim3 __iomem *sw = fs->swim3;
1028
1029 mutex_lock(&swim3_mutex);
1030 if (fs->ref_count > 0 && --fs->ref_count == 0) {
1031 swim3_action(fs, MOTOR_OFF);
1032 out_8(&sw->control_bic, 0xff);
1033 swim3_select(fs, RELAX);
1034 }
1035 mutex_unlock(&swim3_mutex);
1036 }
1037
1038 static unsigned int floppy_check_events(struct gendisk *disk,
1039 unsigned int clearing)
1040 {
1041 struct floppy_state *fs = disk->private_data;
1042 return fs->ejected ? DISK_EVENT_MEDIA_CHANGE : 0;
1043 }
1044
1045 static int floppy_revalidate(struct gendisk *disk)
1046 {
1047 struct floppy_state *fs = disk->private_data;
1048 struct swim3 __iomem *sw;
1049 int ret, n;
1050
1051 if (fs->mdev->media_bay &&
1052 check_media_bay(fs->mdev->media_bay) != MB_FD)
1053 return -ENXIO;
1054
1055 sw = fs->swim3;
1056 grab_drive(fs, revalidating, 0);
1057 out_8(&sw->intr_enable, 0);
1058 out_8(&sw->control_bis, DRIVE_ENABLE);
1059 swim3_action(fs, MOTOR_ON); /* necessary? */
1060 fs->write_prot = -1;
1061 fs->cur_cyl = -1;
1062 mdelay(1);
1063 for (n = HZ; n > 0; --n) {
1064 if (swim3_readbit(fs, SEEK_COMPLETE))
1065 break;
1066 if (signal_pending(current))
1067 break;
1068 swim3_select(fs, RELAX);
1069 schedule_timeout_interruptible(1);
1070 }
1071 ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
1072 || swim3_readbit(fs, DISK_IN) == 0;
1073 if (ret)
1074 swim3_action(fs, MOTOR_OFF);
1075 else {
1076 fs->ejected = 0;
1077 swim3_action(fs, SETMFM);
1078 }
1079 swim3_select(fs, RELAX);
1080
1081 release_drive(fs);
1082 return ret;
1083 }
1084
1085 static const struct block_device_operations floppy_fops = {
1086 .open = floppy_unlocked_open,
1087 .release = floppy_release,
1088 .ioctl = floppy_ioctl,
1089 .check_events = floppy_check_events,
1090 .revalidate_disk= floppy_revalidate,
1091 };
1092
1093 static void swim3_mb_event(struct macio_dev* mdev, int mb_state)
1094 {
1095 struct floppy_state *fs = macio_get_drvdata(mdev);
1096 struct swim3 __iomem *sw;
1097
1098 if (!fs)
1099 return;
1100
1101 sw = fs->swim3;
1102
1103 if (mb_state != MB_FD)
1104 return;
1105
1106 /* Clear state */
1107 out_8(&sw->intr_enable, 0);
1108 in_8(&sw->intr);
1109 in_8(&sw->error);
1110 }
1111
1112 static int swim3_add_device(struct macio_dev *mdev, int index)
1113 {
1114 struct device_node *swim = mdev->ofdev.dev.of_node;
1115 struct floppy_state *fs = &floppy_states[index];
1116 int rc = -EBUSY;
1117
1118 /* Do this first for message macros */
1119 memset(fs, 0, sizeof(*fs));
1120 fs->mdev = mdev;
1121 fs->index = index;
1122
1123 /* Check & Request resources */
1124 if (macio_resource_count(mdev) < 2) {
1125 swim3_err("%s", "No address in device-tree\n");
1126 return -ENXIO;
1127 }
1128 if (macio_irq_count(mdev) < 1) {
1129 swim3_err("%s", "No interrupt in device-tree\n");
1130 return -ENXIO;
1131 }
1132 if (macio_request_resource(mdev, 0, "swim3 (mmio)")) {
1133 swim3_err("%s", "Can't request mmio resource\n");
1134 return -EBUSY;
1135 }
1136 if (macio_request_resource(mdev, 1, "swim3 (dma)")) {
1137 swim3_err("%s", "Can't request dma resource\n");
1138 macio_release_resource(mdev, 0);
1139 return -EBUSY;
1140 }
1141 dev_set_drvdata(&mdev->ofdev.dev, fs);
1142
1143 if (mdev->media_bay == NULL)
1144 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1145
1146 fs->state = idle;
1147 fs->swim3 = (struct swim3 __iomem *)
1148 ioremap(macio_resource_start(mdev, 0), 0x200);
1149 if (fs->swim3 == NULL) {
1150 swim3_err("%s", "Couldn't map mmio registers\n");
1151 rc = -ENOMEM;
1152 goto out_release;
1153 }
1154 fs->dma = (struct dbdma_regs __iomem *)
1155 ioremap(macio_resource_start(mdev, 1), 0x200);
1156 if (fs->dma == NULL) {
1157 swim3_err("%s", "Couldn't map dma registers\n");
1158 iounmap(fs->swim3);
1159 rc = -ENOMEM;
1160 goto out_release;
1161 }
1162 fs->swim3_intr = macio_irq(mdev, 0);
1163 fs->dma_intr = macio_irq(mdev, 1);
1164 fs->cur_cyl = -1;
1165 fs->cur_sector = -1;
1166 fs->secpercyl = 36;
1167 fs->secpertrack = 18;
1168 fs->total_secs = 2880;
1169 init_waitqueue_head(&fs->wait);
1170
1171 fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1172 memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1173 fs->dma_cmd[1].command = cpu_to_le16(DBDMA_STOP);
1174
1175 if (mdev->media_bay == NULL || check_media_bay(mdev->media_bay) == MB_FD)
1176 swim3_mb_event(mdev, MB_FD);
1177
1178 if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1179 swim3_err("%s", "Couldn't request interrupt\n");
1180 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1181 goto out_unmap;
1182 return -EBUSY;
1183 }
1184
1185 init_timer(&fs->timeout);
1186
1187 swim3_info("SWIM3 floppy controller %s\n",
1188 mdev->media_bay ? "in media bay" : "");
1189
1190 return 0;
1191
1192 out_unmap:
1193 iounmap(fs->dma);
1194 iounmap(fs->swim3);
1195
1196 out_release:
1197 macio_release_resource(mdev, 0);
1198 macio_release_resource(mdev, 1);
1199
1200 return rc;
1201 }
1202
1203 static int swim3_attach(struct macio_dev *mdev,
1204 const struct of_device_id *match)
1205 {
1206 struct gendisk *disk;
1207 int index, rc;
1208
1209 index = floppy_count++;
1210 if (index >= MAX_FLOPPIES)
1211 return -ENXIO;
1212
1213 /* Add the drive */
1214 rc = swim3_add_device(mdev, index);
1215 if (rc)
1216 return rc;
1217 /* Now register that disk. Same comment about failure handling */
1218 disk = disks[index] = alloc_disk(1);
1219 if (disk == NULL)
1220 return -ENOMEM;
1221 disk->queue = blk_init_queue(do_fd_request, &swim3_lock);
1222 if (disk->queue == NULL) {
1223 put_disk(disk);
1224 return -ENOMEM;
1225 }
1226 disk->queue->queuedata = &floppy_states[index];
1227
1228 if (index == 0) {
1229 /* If we failed, there isn't much we can do as the driver is still
1230 * too dumb to remove the device, just bail out
1231 */
1232 if (register_blkdev(FLOPPY_MAJOR, "fd"))
1233 return 0;
1234 }
1235
1236 disk->major = FLOPPY_MAJOR;
1237 disk->first_minor = index;
1238 disk->fops = &floppy_fops;
1239 disk->private_data = &floppy_states[index];
1240 disk->flags |= GENHD_FL_REMOVABLE;
1241 sprintf(disk->disk_name, "fd%d", index);
1242 set_capacity(disk, 2880);
1243 add_disk(disk);
1244
1245 return 0;
1246 }
1247
1248 static struct of_device_id swim3_match[] =
1249 {
1250 {
1251 .name = "swim3",
1252 },
1253 {
1254 .compatible = "ohare-swim3"
1255 },
1256 {
1257 .compatible = "swim3"
1258 },
1259 { /* end of list */ }
1260 };
1261
1262 static struct macio_driver swim3_driver =
1263 {
1264 .driver = {
1265 .name = "swim3",
1266 .of_match_table = swim3_match,
1267 },
1268 .probe = swim3_attach,
1269 #ifdef CONFIG_PMAC_MEDIABAY
1270 .mediabay_event = swim3_mb_event,
1271 #endif
1272 #if 0
1273 .suspend = swim3_suspend,
1274 .resume = swim3_resume,
1275 #endif
1276 };
1277
1278
1279 int swim3_init(void)
1280 {
1281 macio_register_driver(&swim3_driver);
1282 return 0;
1283 }
1284
1285 module_init(swim3_init)
1286
1287 MODULE_LICENSE("GPL");
1288 MODULE_AUTHOR("Paul Mackerras");
1289 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);
Linux with added FPC-III support