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usb-storage: redo incorrect reads
[zen-stable.git] / drivers / block / swim3.c
blob773bfa7927775396f80c004b4d6551c485efe4c6
1 /*
2 * Driver for the SWIM3 (Super Woz Integrated Machine 3)
3 * floppy controller found on Power Macintoshes.
4 *
5 * Copyright (C) 1996 Paul Mackerras.
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13 /*
14 * TODO:
15 * handle 2 drives
16 * handle GCR disks
17 */
18
19 #include <linux/stddef.h>
20 #include <linux/kernel.h>
21 #include <linux/sched.h>
22 #include <linux/timer.h>
23 #include <linux/delay.h>
24 #include <linux/fd.h>
25 #include <linux/ioctl.h>
26 #include <linux/blkdev.h>
27 #include <linux/interrupt.h>
28 #include <linux/mutex.h>
29 #include <linux/module.h>
30 #include <linux/spinlock.h>
31 #include <asm/io.h>
32 #include <asm/dbdma.h>
33 #include <asm/prom.h>
34 #include <asm/uaccess.h>
35 #include <asm/mediabay.h>
36 #include <asm/machdep.h>
37 #include <asm/pmac_feature.h>
38
39 static DEFINE_MUTEX(swim3_mutex);
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 macio_dev *mdev;
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(struct request_queue * 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);
244 /*static void fd_dma_interrupt(int irq, void *dev_id);*/
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 block_device *bdev, fmode_t mode,
250 unsigned int cmd, unsigned long param);
251 static int floppy_open(struct block_device *bdev, fmode_t mode);
252 static int floppy_release(struct gendisk *disk, fmode_t mode);
253 static unsigned int floppy_check_events(struct gendisk *disk,
254 unsigned int clearing);
255 static int floppy_revalidate(struct gendisk *disk);
256
257 static bool swim3_end_request(int err, unsigned int nr_bytes)
258 {
259 if (__blk_end_request(fd_req, err, nr_bytes))
260 return true;
261
262 fd_req = NULL;
263 return false;
264 }
265
266 static bool swim3_end_request_cur(int err)
267 {
268 return swim3_end_request(err, blk_rq_cur_bytes(fd_req));
269 }
270
271 static void swim3_select(struct floppy_state *fs, int sel)
272 {
273 struct swim3 __iomem *sw = fs->swim3;
274
275 out_8(&sw->select, RELAX);
276 if (sel & 8)
277 out_8(&sw->control_bis, SELECT);
278 else
279 out_8(&sw->control_bic, SELECT);
280 out_8(&sw->select, sel & CA_MASK);
281 }
282
283 static void swim3_action(struct floppy_state *fs, int action)
284 {
285 struct swim3 __iomem *sw = fs->swim3;
286
287 swim3_select(fs, action);
288 udelay(1);
289 out_8(&sw->select, sw->select | LSTRB);
290 udelay(2);
291 out_8(&sw->select, sw->select & ~LSTRB);
292 udelay(1);
293 }
294
295 static int swim3_readbit(struct floppy_state *fs, int bit)
296 {
297 struct swim3 __iomem *sw = fs->swim3;
298 int stat;
299
300 swim3_select(fs, bit);
301 udelay(1);
302 stat = in_8(&sw->status);
303 return (stat & DATA) == 0;
304 }
305
306 static void do_fd_request(struct request_queue * q)
307 {
308 int i;
309
310 for(i=0; i<floppy_count; i++) {
311 struct floppy_state *fs = &floppy_states[i];
312 if (fs->mdev->media_bay &&
313 check_media_bay(fs->mdev->media_bay) != MB_FD)
314 continue;
315 start_request(fs);
316 }
317 }
318
319 static void start_request(struct floppy_state *fs)
320 {
321 struct request *req;
322 unsigned long x;
323
324 if (fs->state == idle && fs->wanted) {
325 fs->state = available;
326 wake_up(&fs->wait);
327 return;
328 }
329 while (fs->state == idle) {
330 if (!fd_req) {
331 fd_req = blk_fetch_request(swim3_queue);
332 if (!fd_req)
333 break;
334 }
335 req = fd_req;
336 #if 0
337 printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%u buf=%p\n",
338 req->rq_disk->disk_name, req->cmd,
339 (long)blk_rq_pos(req), blk_rq_sectors(req), req->buffer);
340 printk(" errors=%d current_nr_sectors=%u\n",
341 req->errors, blk_rq_cur_sectors(req));
342 #endif
343
344 if (blk_rq_pos(req) >= fs->total_secs) {
345 swim3_end_request_cur(-EIO);
346 continue;
347 }
348 if (fs->ejected) {
349 swim3_end_request_cur(-EIO);
350 continue;
351 }
352
353 if (rq_data_dir(req) == WRITE) {
354 if (fs->write_prot < 0)
355 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
356 if (fs->write_prot) {
357 swim3_end_request_cur(-EIO);
358 continue;
359 }
360 }
361
362 /* Do not remove the cast. blk_rq_pos(req) is now a
363 * sector_t and can be 64 bits, but it will never go
364 * past 32 bits for this driver anyway, so we can
365 * safely cast it down and not have to do a 64/32
366 * division
367 */
368 fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl;
369 x = ((long)blk_rq_pos(req)) % fs->secpercyl;
370 fs->head = x / fs->secpertrack;
371 fs->req_sector = x % fs->secpertrack + 1;
372 fd_req = req;
373 fs->state = do_transfer;
374 fs->retries = 0;
375
376 act(fs);
377 }
378 }
379
380 static void set_timeout(struct floppy_state *fs, int nticks,
381 void (*proc)(unsigned long))
382 {
383 unsigned long flags;
384
385 spin_lock_irqsave(&fs->lock, flags);
386 if (fs->timeout_pending)
387 del_timer(&fs->timeout);
388 fs->timeout.expires = jiffies + nticks;
389 fs->timeout.function = proc;
390 fs->timeout.data = (unsigned long) fs;
391 add_timer(&fs->timeout);
392 fs->timeout_pending = 1;
393 spin_unlock_irqrestore(&fs->lock, flags);
394 }
395
396 static inline void scan_track(struct floppy_state *fs)
397 {
398 struct swim3 __iomem *sw = fs->swim3;
399
400 swim3_select(fs, READ_DATA_0);
401 in_8(&sw->intr); /* clear SEEN_SECTOR bit */
402 in_8(&sw->error);
403 out_8(&sw->intr_enable, SEEN_SECTOR);
404 out_8(&sw->control_bis, DO_ACTION);
405 /* enable intr when track found */
406 set_timeout(fs, HZ, scan_timeout); /* enable timeout */
407 }
408
409 static inline void seek_track(struct floppy_state *fs, int n)
410 {
411 struct swim3 __iomem *sw = fs->swim3;
412
413 if (n >= 0) {
414 swim3_action(fs, SEEK_POSITIVE);
415 sw->nseek = n;
416 } else {
417 swim3_action(fs, SEEK_NEGATIVE);
418 sw->nseek = -n;
419 }
420 fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
421 swim3_select(fs, STEP);
422 in_8(&sw->error);
423 /* enable intr when seek finished */
424 out_8(&sw->intr_enable, SEEK_DONE);
425 out_8(&sw->control_bis, DO_SEEK);
426 set_timeout(fs, 3*HZ, seek_timeout); /* enable timeout */
427 fs->settle_time = 0;
428 }
429
430 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
431 void *buf, int count)
432 {
433 st_le16(&cp->req_count, count);
434 st_le16(&cp->command, cmd);
435 st_le32(&cp->phy_addr, virt_to_bus(buf));
436 cp->xfer_status = 0;
437 }
438
439 static inline void setup_transfer(struct floppy_state *fs)
440 {
441 int n;
442 struct swim3 __iomem *sw = fs->swim3;
443 struct dbdma_cmd *cp = fs->dma_cmd;
444 struct dbdma_regs __iomem *dr = fs->dma;
445
446 if (blk_rq_cur_sectors(fd_req) <= 0) {
447 printk(KERN_ERR "swim3: transfer 0 sectors?\n");
448 return;
449 }
450 if (rq_data_dir(fd_req) == WRITE)
451 n = 1;
452 else {
453 n = fs->secpertrack - fs->req_sector + 1;
454 if (n > blk_rq_cur_sectors(fd_req))
455 n = blk_rq_cur_sectors(fd_req);
456 }
457 fs->scount = n;
458 swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
459 out_8(&sw->sector, fs->req_sector);
460 out_8(&sw->nsect, n);
461 out_8(&sw->gap3, 0);
462 out_le32(&dr->cmdptr, virt_to_bus(cp));
463 if (rq_data_dir(fd_req) == WRITE) {
464 /* Set up 3 dma commands: write preamble, data, postamble */
465 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
466 ++cp;
467 init_dma(cp, OUTPUT_MORE, fd_req->buffer, 512);
468 ++cp;
469 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
470 } else {
471 init_dma(cp, INPUT_LAST, fd_req->buffer, n * 512);
472 }
473 ++cp;
474 out_le16(&cp->command, DBDMA_STOP);
475 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
476 in_8(&sw->error);
477 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
478 if (rq_data_dir(fd_req) == WRITE)
479 out_8(&sw->control_bis, WRITE_SECTORS);
480 in_8(&sw->intr);
481 out_le32(&dr->control, (RUN << 16) | RUN);
482 /* enable intr when transfer complete */
483 out_8(&sw->intr_enable, TRANSFER_DONE);
484 out_8(&sw->control_bis, DO_ACTION);
485 set_timeout(fs, 2*HZ, xfer_timeout); /* enable timeout */
486 }
487
488 static void act(struct floppy_state *fs)
489 {
490 for (;;) {
491 switch (fs->state) {
492 case idle:
493 return; /* XXX shouldn't get here */
494
495 case locating:
496 if (swim3_readbit(fs, TRACK_ZERO)) {
497 fs->cur_cyl = 0;
498 if (fs->req_cyl == 0)
499 fs->state = do_transfer;
500 else
501 fs->state = seeking;
502 break;
503 }
504 scan_track(fs);
505 return;
506
507 case seeking:
508 if (fs->cur_cyl < 0) {
509 fs->expect_cyl = -1;
510 fs->state = locating;
511 break;
512 }
513 if (fs->req_cyl == fs->cur_cyl) {
514 printk("whoops, seeking 0\n");
515 fs->state = do_transfer;
516 break;
517 }
518 seek_track(fs, fs->req_cyl - fs->cur_cyl);
519 return;
520
521 case settling:
522 /* check for SEEK_COMPLETE after 30ms */
523 fs->settle_time = (HZ + 32) / 33;
524 set_timeout(fs, fs->settle_time, settle_timeout);
525 return;
526
527 case do_transfer:
528 if (fs->cur_cyl != fs->req_cyl) {
529 if (fs->retries > 5) {
530 swim3_end_request_cur(-EIO);
531 fs->state = idle;
532 return;
533 }
534 fs->state = seeking;
535 break;
536 }
537 setup_transfer(fs);
538 return;
539
540 case jogging:
541 seek_track(fs, -5);
542 return;
543
544 default:
545 printk(KERN_ERR"swim3: unknown state %d\n", fs->state);
546 return;
547 }
548 }
549 }
550
551 static void scan_timeout(unsigned long data)
552 {
553 struct floppy_state *fs = (struct floppy_state *) data;
554 struct swim3 __iomem *sw = fs->swim3;
555
556 fs->timeout_pending = 0;
557 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
558 out_8(&sw->select, RELAX);
559 out_8(&sw->intr_enable, 0);
560 fs->cur_cyl = -1;
561 if (fs->retries > 5) {
562 swim3_end_request_cur(-EIO);
563 fs->state = idle;
564 start_request(fs);
565 } else {
566 fs->state = jogging;
567 act(fs);
568 }
569 }
570
571 static void seek_timeout(unsigned long data)
572 {
573 struct floppy_state *fs = (struct floppy_state *) data;
574 struct swim3 __iomem *sw = fs->swim3;
575
576 fs->timeout_pending = 0;
577 out_8(&sw->control_bic, DO_SEEK);
578 out_8(&sw->select, RELAX);
579 out_8(&sw->intr_enable, 0);
580 printk(KERN_ERR "swim3: seek timeout\n");
581 swim3_end_request_cur(-EIO);
582 fs->state = idle;
583 start_request(fs);
584 }
585
586 static void settle_timeout(unsigned long data)
587 {
588 struct floppy_state *fs = (struct floppy_state *) data;
589 struct swim3 __iomem *sw = fs->swim3;
590
591 fs->timeout_pending = 0;
592 if (swim3_readbit(fs, SEEK_COMPLETE)) {
593 out_8(&sw->select, RELAX);
594 fs->state = locating;
595 act(fs);
596 return;
597 }
598 out_8(&sw->select, RELAX);
599 if (fs->settle_time < 2*HZ) {
600 ++fs->settle_time;
601 set_timeout(fs, 1, settle_timeout);
602 return;
603 }
604 printk(KERN_ERR "swim3: seek settle timeout\n");
605 swim3_end_request_cur(-EIO);
606 fs->state = idle;
607 start_request(fs);
608 }
609
610 static void xfer_timeout(unsigned long data)
611 {
612 struct floppy_state *fs = (struct floppy_state *) data;
613 struct swim3 __iomem *sw = fs->swim3;
614 struct dbdma_regs __iomem *dr = fs->dma;
615 int n;
616
617 fs->timeout_pending = 0;
618 out_le32(&dr->control, RUN << 16);
619 /* We must wait a bit for dbdma to stop */
620 for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
621 udelay(1);
622 out_8(&sw->intr_enable, 0);
623 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
624 out_8(&sw->select, RELAX);
625 printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
626 (rq_data_dir(fd_req)==WRITE? "writ": "read"),
627 (long)blk_rq_pos(fd_req));
628 swim3_end_request_cur(-EIO);
629 fs->state = idle;
630 start_request(fs);
631 }
632
633 static irqreturn_t swim3_interrupt(int irq, void *dev_id)
634 {
635 struct floppy_state *fs = (struct floppy_state *) dev_id;
636 struct swim3 __iomem *sw = fs->swim3;
637 int intr, err, n;
638 int stat, resid;
639 struct dbdma_regs __iomem *dr;
640 struct dbdma_cmd *cp;
641
642 intr = in_8(&sw->intr);
643 err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
644 if ((intr & ERROR_INTR) && fs->state != do_transfer)
645 printk(KERN_ERR "swim3_interrupt, state=%d, dir=%x, intr=%x, err=%x\n",
646 fs->state, rq_data_dir(fd_req), intr, err);
647 switch (fs->state) {
648 case locating:
649 if (intr & SEEN_SECTOR) {
650 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
651 out_8(&sw->select, RELAX);
652 out_8(&sw->intr_enable, 0);
653 del_timer(&fs->timeout);
654 fs->timeout_pending = 0;
655 if (sw->ctrack == 0xff) {
656 printk(KERN_ERR "swim3: seen sector but cyl=ff?\n");
657 fs->cur_cyl = -1;
658 if (fs->retries > 5) {
659 swim3_end_request_cur(-EIO);
660 fs->state = idle;
661 start_request(fs);
662 } else {
663 fs->state = jogging;
664 act(fs);
665 }
666 break;
667 }
668 fs->cur_cyl = sw->ctrack;
669 fs->cur_sector = sw->csect;
670 if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
671 printk(KERN_ERR "swim3: expected cyl %d, got %d\n",
672 fs->expect_cyl, fs->cur_cyl);
673 fs->state = do_transfer;
674 act(fs);
675 }
676 break;
677 case seeking:
678 case jogging:
679 if (sw->nseek == 0) {
680 out_8(&sw->control_bic, DO_SEEK);
681 out_8(&sw->select, RELAX);
682 out_8(&sw->intr_enable, 0);
683 del_timer(&fs->timeout);
684 fs->timeout_pending = 0;
685 if (fs->state == seeking)
686 ++fs->retries;
687 fs->state = settling;
688 act(fs);
689 }
690 break;
691 case settling:
692 out_8(&sw->intr_enable, 0);
693 del_timer(&fs->timeout);
694 fs->timeout_pending = 0;
695 act(fs);
696 break;
697 case do_transfer:
698 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
699 break;
700 out_8(&sw->intr_enable, 0);
701 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
702 out_8(&sw->select, RELAX);
703 del_timer(&fs->timeout);
704 fs->timeout_pending = 0;
705 dr = fs->dma;
706 cp = fs->dma_cmd;
707 if (rq_data_dir(fd_req) == WRITE)
708 ++cp;
709 /*
710 * Check that the main data transfer has finished.
711 * On writing, the swim3 sometimes doesn't use
712 * up all the bytes of the postamble, so we can still
713 * see DMA active here. That doesn't matter as long
714 * as all the sector data has been transferred.
715 */
716 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
717 /* wait a little while for DMA to complete */
718 for (n = 0; n < 100; ++n) {
719 if (cp->xfer_status != 0)
720 break;
721 udelay(1);
722 barrier();
723 }
724 }
725 /* turn off DMA */
726 out_le32(&dr->control, (RUN | PAUSE) << 16);
727 stat = ld_le16(&cp->xfer_status);
728 resid = ld_le16(&cp->res_count);
729 if (intr & ERROR_INTR) {
730 n = fs->scount - 1 - resid / 512;
731 if (n > 0) {
732 blk_update_request(fd_req, 0, n << 9);
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)blk_rq_pos(fd_req), err);
742 swim3_end_request_cur(-EIO);
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=%x, intr=%x, err=%x\n",
750 fs->state, rq_data_dir(fd_req), intr, err);
751 swim3_end_request_cur(-EIO);
752 fs->state = idle;
753 start_request(fs);
754 break;
755 }
756 if (swim3_end_request(0, fs->scount << 9)) {
757 fs->req_sector += fs->scount;
758 if (fs->req_sector > fs->secpertrack) {
759 fs->req_sector -= fs->secpertrack;
760 if (++fs->head > 1) {
761 fs->head = 0;
762 ++fs->req_cyl;
763 }
764 }
765 act(fs);
766 } else
767 fs->state = idle;
768 }
769 if (fs->state == idle)
770 start_request(fs);
771 break;
772 default:
773 printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state);
774 }
775 return IRQ_HANDLED;
776 }
777
778 /*
779 static void fd_dma_interrupt(int irq, void *dev_id)
780 {
781 }
782 */
783
784 static int grab_drive(struct floppy_state *fs, enum swim_state state,
785 int interruptible)
786 {
787 unsigned long flags;
788
789 spin_lock_irqsave(&fs->lock, flags);
790 if (fs->state != idle) {
791 ++fs->wanted;
792 while (fs->state != available) {
793 if (interruptible && signal_pending(current)) {
794 --fs->wanted;
795 spin_unlock_irqrestore(&fs->lock, flags);
796 return -EINTR;
797 }
798 interruptible_sleep_on(&fs->wait);
799 }
800 --fs->wanted;
801 }
802 fs->state = state;
803 spin_unlock_irqrestore(&fs->lock, flags);
804 return 0;
805 }
806
807 static void release_drive(struct floppy_state *fs)
808 {
809 unsigned long flags;
810
811 spin_lock_irqsave(&fs->lock, flags);
812 fs->state = idle;
813 start_request(fs);
814 spin_unlock_irqrestore(&fs->lock, flags);
815 }
816
817 static int fd_eject(struct floppy_state *fs)
818 {
819 int err, n;
820
821 err = grab_drive(fs, ejecting, 1);
822 if (err)
823 return err;
824 swim3_action(fs, EJECT);
825 for (n = 20; n > 0; --n) {
826 if (signal_pending(current)) {
827 err = -EINTR;
828 break;
829 }
830 swim3_select(fs, RELAX);
831 schedule_timeout_interruptible(1);
832 if (swim3_readbit(fs, DISK_IN) == 0)
833 break;
834 }
835 swim3_select(fs, RELAX);
836 udelay(150);
837 fs->ejected = 1;
838 release_drive(fs);
839 return err;
840 }
841
842 static struct floppy_struct floppy_type =
843 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL }; /* 7 1.44MB 3.5" */
844
845 static int floppy_locked_ioctl(struct block_device *bdev, fmode_t mode,
846 unsigned int cmd, unsigned long param)
847 {
848 struct floppy_state *fs = bdev->bd_disk->private_data;
849 int err;
850
851 if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
852 return -EPERM;
853
854 if (fs->mdev->media_bay &&
855 check_media_bay(fs->mdev->media_bay) != MB_FD)
856 return -ENXIO;
857
858 switch (cmd) {
859 case FDEJECT:
860 if (fs->ref_count != 1)
861 return -EBUSY;
862 err = fd_eject(fs);
863 return err;
864 case FDGETPRM:
865 if (copy_to_user((void __user *) param, &floppy_type,
866 sizeof(struct floppy_struct)))
867 return -EFAULT;
868 return 0;
869 }
870 return -ENOTTY;
871 }
872
873 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
874 unsigned int cmd, unsigned long param)
875 {
876 int ret;
877
878 mutex_lock(&swim3_mutex);
879 ret = floppy_locked_ioctl(bdev, mode, cmd, param);
880 mutex_unlock(&swim3_mutex);
881
882 return ret;
883 }
884
885 static int floppy_open(struct block_device *bdev, fmode_t mode)
886 {
887 struct floppy_state *fs = bdev->bd_disk->private_data;
888 struct swim3 __iomem *sw = fs->swim3;
889 int n, err = 0;
890
891 if (fs->ref_count == 0) {
892 if (fs->mdev->media_bay &&
893 check_media_bay(fs->mdev->media_bay) != MB_FD)
894 return -ENXIO;
895 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
896 out_8(&sw->control_bic, 0xff);
897 out_8(&sw->mode, 0x95);
898 udelay(10);
899 out_8(&sw->intr_enable, 0);
900 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
901 swim3_action(fs, MOTOR_ON);
902 fs->write_prot = -1;
903 fs->cur_cyl = -1;
904 for (n = 0; n < 2 * HZ; ++n) {
905 if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
906 break;
907 if (signal_pending(current)) {
908 err = -EINTR;
909 break;
910 }
911 swim3_select(fs, RELAX);
912 schedule_timeout_interruptible(1);
913 }
914 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
915 || swim3_readbit(fs, DISK_IN) == 0))
916 err = -ENXIO;
917 swim3_action(fs, SETMFM);
918 swim3_select(fs, RELAX);
919
920 } else if (fs->ref_count == -1 || mode & FMODE_EXCL)
921 return -EBUSY;
922
923 if (err == 0 && (mode & FMODE_NDELAY) == 0
924 && (mode & (FMODE_READ|FMODE_WRITE))) {
925 check_disk_change(bdev);
926 if (fs->ejected)
927 err = -ENXIO;
928 }
929
930 if (err == 0 && (mode & FMODE_WRITE)) {
931 if (fs->write_prot < 0)
932 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
933 if (fs->write_prot)
934 err = -EROFS;
935 }
936
937 if (err) {
938 if (fs->ref_count == 0) {
939 swim3_action(fs, MOTOR_OFF);
940 out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
941 swim3_select(fs, RELAX);
942 }
943 return err;
944 }
945
946 if (mode & FMODE_EXCL)
947 fs->ref_count = -1;
948 else
949 ++fs->ref_count;
950
951 return 0;
952 }
953
954 static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
955 {
956 int ret;
957
958 mutex_lock(&swim3_mutex);
959 ret = floppy_open(bdev, mode);
960 mutex_unlock(&swim3_mutex);
961
962 return ret;
963 }
964
965 static int floppy_release(struct gendisk *disk, fmode_t mode)
966 {
967 struct floppy_state *fs = disk->private_data;
968 struct swim3 __iomem *sw = fs->swim3;
969 mutex_lock(&swim3_mutex);
970 if (fs->ref_count > 0 && --fs->ref_count == 0) {
971 swim3_action(fs, MOTOR_OFF);
972 out_8(&sw->control_bic, 0xff);
973 swim3_select(fs, RELAX);
974 }
975 mutex_unlock(&swim3_mutex);
976 return 0;
977 }
978
979 static unsigned int floppy_check_events(struct gendisk *disk,
980 unsigned int clearing)
981 {
982 struct floppy_state *fs = disk->private_data;
983 return fs->ejected ? DISK_EVENT_MEDIA_CHANGE : 0;
984 }
985
986 static int floppy_revalidate(struct gendisk *disk)
987 {
988 struct floppy_state *fs = disk->private_data;
989 struct swim3 __iomem *sw;
990 int ret, n;
991
992 if (fs->mdev->media_bay &&
993 check_media_bay(fs->mdev->media_bay) != MB_FD)
994 return -ENXIO;
995
996 sw = fs->swim3;
997 grab_drive(fs, revalidating, 0);
998 out_8(&sw->intr_enable, 0);
999 out_8(&sw->control_bis, DRIVE_ENABLE);
1000 swim3_action(fs, MOTOR_ON); /* necessary? */
1001 fs->write_prot = -1;
1002 fs->cur_cyl = -1;
1003 mdelay(1);
1004 for (n = HZ; n > 0; --n) {
1005 if (swim3_readbit(fs, SEEK_COMPLETE))
1006 break;
1007 if (signal_pending(current))
1008 break;
1009 swim3_select(fs, RELAX);
1010 schedule_timeout_interruptible(1);
1011 }
1012 ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
1013 || swim3_readbit(fs, DISK_IN) == 0;
1014 if (ret)
1015 swim3_action(fs, MOTOR_OFF);
1016 else {
1017 fs->ejected = 0;
1018 swim3_action(fs, SETMFM);
1019 }
1020 swim3_select(fs, RELAX);
1021
1022 release_drive(fs);
1023 return ret;
1024 }
1025
1026 static const struct block_device_operations floppy_fops = {
1027 .open = floppy_unlocked_open,
1028 .release = floppy_release,
1029 .ioctl = floppy_ioctl,
1030 .check_events = floppy_check_events,
1031 .revalidate_disk= floppy_revalidate,
1032 };
1033
1034 static int swim3_add_device(struct macio_dev *mdev, int index)
1035 {
1036 struct device_node *swim = mdev->ofdev.dev.of_node;
1037 struct floppy_state *fs = &floppy_states[index];
1038 int rc = -EBUSY;
1039
1040 /* Check & Request resources */
1041 if (macio_resource_count(mdev) < 2) {
1042 printk(KERN_WARNING "ifd%d: no address for %s\n",
1043 index, swim->full_name);
1044 return -ENXIO;
1045 }
1046 if (macio_irq_count(mdev) < 2) {
1047 printk(KERN_WARNING "fd%d: no intrs for device %s\n",
1048 index, swim->full_name);
1049 }
1050 if (macio_request_resource(mdev, 0, "swim3 (mmio)")) {
1051 printk(KERN_ERR "fd%d: can't request mmio resource for %s\n",
1052 index, swim->full_name);
1053 return -EBUSY;
1054 }
1055 if (macio_request_resource(mdev, 1, "swim3 (dma)")) {
1056 printk(KERN_ERR "fd%d: can't request dma resource for %s\n",
1057 index, swim->full_name);
1058 macio_release_resource(mdev, 0);
1059 return -EBUSY;
1060 }
1061 dev_set_drvdata(&mdev->ofdev.dev, fs);
1062
1063 if (mdev->media_bay == NULL)
1064 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1065
1066 memset(fs, 0, sizeof(*fs));
1067 spin_lock_init(&fs->lock);
1068 fs->state = idle;
1069 fs->swim3 = (struct swim3 __iomem *)
1070 ioremap(macio_resource_start(mdev, 0), 0x200);
1071 if (fs->swim3 == NULL) {
1072 printk("fd%d: couldn't map registers for %s\n",
1073 index, swim->full_name);
1074 rc = -ENOMEM;
1075 goto out_release;
1076 }
1077 fs->dma = (struct dbdma_regs __iomem *)
1078 ioremap(macio_resource_start(mdev, 1), 0x200);
1079 if (fs->dma == NULL) {
1080 printk("fd%d: couldn't map DMA for %s\n",
1081 index, swim->full_name);
1082 iounmap(fs->swim3);
1083 rc = -ENOMEM;
1084 goto out_release;
1085 }
1086 fs->swim3_intr = macio_irq(mdev, 0);
1087 fs->dma_intr = macio_irq(mdev, 1);
1088 fs->cur_cyl = -1;
1089 fs->cur_sector = -1;
1090 fs->secpercyl = 36;
1091 fs->secpertrack = 18;
1092 fs->total_secs = 2880;
1093 fs->mdev = mdev;
1094 init_waitqueue_head(&fs->wait);
1095
1096 fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1097 memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1098 st_le16(&fs->dma_cmd[1].command, DBDMA_STOP);
1099
1100 if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1101 printk(KERN_ERR "fd%d: couldn't request irq %d for %s\n",
1102 index, fs->swim3_intr, swim->full_name);
1103 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1104 goto out_unmap;
1105 return -EBUSY;
1106 }
1107 /*
1108 if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) {
1109 printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA",
1110 fs->dma_intr);
1111 return -EBUSY;
1112 }
1113 */
1114
1115 init_timer(&fs->timeout);
1116
1117 printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count,
1118 mdev->media_bay ? "in media bay" : "");
1119
1120 return 0;
1121
1122 out_unmap:
1123 iounmap(fs->dma);
1124 iounmap(fs->swim3);
1125
1126 out_release:
1127 macio_release_resource(mdev, 0);
1128 macio_release_resource(mdev, 1);
1129
1130 return rc;
1131 }
1132
1133 static int __devinit swim3_attach(struct macio_dev *mdev, const struct of_device_id *match)
1134 {
1135 int i, rc;
1136 struct gendisk *disk;
1137
1138 /* Add the drive */
1139 rc = swim3_add_device(mdev, floppy_count);
1140 if (rc)
1141 return rc;
1142
1143 /* Now create the queue if not there yet */
1144 if (swim3_queue == NULL) {
1145 /* If we failed, there isn't much we can do as the driver is still
1146 * too dumb to remove the device, just bail out
1147 */
1148 if (register_blkdev(FLOPPY_MAJOR, "fd"))
1149 return 0;
1150 swim3_queue = blk_init_queue(do_fd_request, &swim3_lock);
1151 if (swim3_queue == NULL) {
1152 unregister_blkdev(FLOPPY_MAJOR, "fd");
1153 return 0;
1154 }
1155 }
1156
1157 /* Now register that disk. Same comment about failure handling */
1158 i = floppy_count++;
1159 disk = disks[i] = alloc_disk(1);
1160 if (disk == NULL)
1161 return 0;
1162
1163 disk->major = FLOPPY_MAJOR;
1164 disk->first_minor = i;
1165 disk->fops = &floppy_fops;
1166 disk->private_data = &floppy_states[i];
1167 disk->queue = swim3_queue;
1168 disk->flags |= GENHD_FL_REMOVABLE;
1169 sprintf(disk->disk_name, "fd%d", i);
1170 set_capacity(disk, 2880);
1171 add_disk(disk);
1172
1173 return 0;
1174 }
1175
1176 static struct of_device_id swim3_match[] =
1177 {
1178 {
1179 .name = "swim3",
1180 },
1181 {
1182 .compatible = "ohare-swim3"
1183 },
1184 {
1185 .compatible = "swim3"
1186 },
1187 };
1188
1189 static struct macio_driver swim3_driver =
1190 {
1191 .driver = {
1192 .name = "swim3",
1193 .of_match_table = swim3_match,
1194 },
1195 .probe = swim3_attach,
1196 #if 0
1197 .suspend = swim3_suspend,
1198 .resume = swim3_resume,
1199 #endif
1200 };
1201
1202
1203 int swim3_init(void)
1204 {
1205 macio_register_driver(&swim3_driver);
1206 return 0;
1207 }
1208
1209 module_init(swim3_init)
1210
1211 MODULE_LICENSE("GPL");
1212 MODULE_AUTHOR("Paul Mackerras");
1213 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);