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cgroups: fix a race between cgroup_clone and umount
[linux-2.6/mini2440.git] / drivers / block / swim3.c
blob612965307ba009e04c8f733a870a5b4df69b4572
1 /*
2 * Driver for the SWIM3 (Super Woz Integrated Machine 3)
3 * floppy controller found on Power Macintoshes.
4 *
5 * Copyright (C) 1996 Paul Mackerras.
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13 /*
14 * TODO:
15 * handle 2 drives
16 * handle GCR disks
17 */
18
19 #include <linux/stddef.h>
20 #include <linux/kernel.h>
21 #include <linux/sched.h>
22 #include <linux/timer.h>
23 #include <linux/delay.h>
24 #include <linux/fd.h>
25 #include <linux/ioctl.h>
26 #include <linux/blkdev.h>
27 #include <linux/interrupt.h>
28 #include <linux/module.h>
29 #include <linux/spinlock.h>
30 #include <asm/io.h>
31 #include <asm/dbdma.h>
32 #include <asm/prom.h>
33 #include <asm/uaccess.h>
34 #include <asm/mediabay.h>
35 #include <asm/machdep.h>
36 #include <asm/pmac_feature.h>
37
38 static struct request_queue *swim3_queue;
39 static struct gendisk *disks[2];
40 static struct request *fd_req;
41
42 #define MAX_FLOPPIES 2
43
44 enum swim_state {
45 idle,
46 locating,
47 seeking,
48 settling,
49 do_transfer,
50 jogging,
51 available,
52 revalidating,
53 ejecting
54 };
55
56 #define REG(x) unsigned char x; char x ## _pad[15];
57
58 /*
59 * The names for these registers mostly represent speculation on my part.
60 * It will be interesting to see how close they are to the names Apple uses.
61 */
62 struct swim3 {
63 REG(data);
64 REG(timer); /* counts down at 1MHz */
65 REG(error);
66 REG(mode);
67 REG(select); /* controls CA0, CA1, CA2 and LSTRB signals */
68 REG(setup);
69 REG(control); /* writing bits clears them */
70 REG(status); /* writing bits sets them in control */
71 REG(intr);
72 REG(nseek); /* # tracks to seek */
73 REG(ctrack); /* current track number */
74 REG(csect); /* current sector number */
75 REG(gap3); /* size of gap 3 in track format */
76 REG(sector); /* sector # to read or write */
77 REG(nsect); /* # sectors to read or write */
78 REG(intr_enable);
79 };
80
81 #define control_bic control
82 #define control_bis status
83
84 /* Bits in select register */
85 #define CA_MASK 7
86 #define LSTRB 8
87
88 /* Bits in control register */
89 #define DO_SEEK 0x80
90 #define FORMAT 0x40
91 #define SELECT 0x20
92 #define WRITE_SECTORS 0x10
93 #define DO_ACTION 0x08
94 #define DRIVE2_ENABLE 0x04
95 #define DRIVE_ENABLE 0x02
96 #define INTR_ENABLE 0x01
97
98 /* Bits in status register */
99 #define FIFO_1BYTE 0x80
100 #define FIFO_2BYTE 0x40
101 #define ERROR 0x20
102 #define DATA 0x08
103 #define RDDATA 0x04
104 #define INTR_PENDING 0x02
105 #define MARK_BYTE 0x01
106
107 /* Bits in intr and intr_enable registers */
108 #define ERROR_INTR 0x20
109 #define DATA_CHANGED 0x10
110 #define TRANSFER_DONE 0x08
111 #define SEEN_SECTOR 0x04
112 #define SEEK_DONE 0x02
113 #define TIMER_DONE 0x01
114
115 /* Bits in error register */
116 #define ERR_DATA_CRC 0x80
117 #define ERR_ADDR_CRC 0x40
118 #define ERR_OVERRUN 0x04
119 #define ERR_UNDERRUN 0x01
120
121 /* Bits in setup register */
122 #define S_SW_RESET 0x80
123 #define S_GCR_WRITE 0x40
124 #define S_IBM_DRIVE 0x20
125 #define S_TEST_MODE 0x10
126 #define S_FCLK_DIV2 0x08
127 #define S_GCR 0x04
128 #define S_COPY_PROT 0x02
129 #define S_INV_WDATA 0x01
130
131 /* Select values for swim3_action */
132 #define SEEK_POSITIVE 0
133 #define SEEK_NEGATIVE 4
134 #define STEP 1
135 #define MOTOR_ON 2
136 #define MOTOR_OFF 6
137 #define INDEX 3
138 #define EJECT 7
139 #define SETMFM 9
140 #define SETGCR 13
141
142 /* Select values for swim3_select and swim3_readbit */
143 #define STEP_DIR 0
144 #define STEPPING 1
145 #define MOTOR_ON 2
146 #define RELAX 3 /* also eject in progress */
147 #define READ_DATA_0 4
148 #define TWOMEG_DRIVE 5
149 #define SINGLE_SIDED 6 /* drive or diskette is 4MB type? */
150 #define DRIVE_PRESENT 7
151 #define DISK_IN 8
152 #define WRITE_PROT 9
153 #define TRACK_ZERO 10
154 #define TACHO 11
155 #define READ_DATA_1 12
156 #define MFM_MODE 13
157 #define SEEK_COMPLETE 14
158 #define ONEMEG_MEDIA 15
159
160 /* Definitions of values used in writing and formatting */
161 #define DATA_ESCAPE 0x99
162 #define GCR_SYNC_EXC 0x3f
163 #define GCR_SYNC_CONV 0x80
164 #define GCR_FIRST_MARK 0xd5
165 #define GCR_SECOND_MARK 0xaa
166 #define GCR_ADDR_MARK "\xd5\xaa\x00"
167 #define GCR_DATA_MARK "\xd5\xaa\x0b"
168 #define GCR_SLIP_BYTE "\x27\xaa"
169 #define GCR_SELF_SYNC "\x3f\xbf\x1e\x34\x3c\x3f"
170
171 #define DATA_99 "\x99\x99"
172 #define MFM_ADDR_MARK "\x99\xa1\x99\xa1\x99\xa1\x99\xfe"
173 #define MFM_INDEX_MARK "\x99\xc2\x99\xc2\x99\xc2\x99\xfc"
174 #define MFM_GAP_LEN 12
175
176 struct floppy_state {
177 enum swim_state state;
178 spinlock_t lock;
179 struct swim3 __iomem *swim3; /* hardware registers */
180 struct dbdma_regs __iomem *dma; /* DMA controller registers */
181 int swim3_intr; /* interrupt number for SWIM3 */
182 int dma_intr; /* interrupt number for DMA channel */
183 int cur_cyl; /* cylinder head is on, or -1 */
184 int cur_sector; /* last sector we saw go past */
185 int req_cyl; /* the cylinder for the current r/w request */
186 int head; /* head number ditto */
187 int req_sector; /* sector number ditto */
188 int scount; /* # sectors we're transferring at present */
189 int retries;
190 int settle_time;
191 int secpercyl; /* disk geometry information */
192 int secpertrack;
193 int total_secs;
194 int write_prot; /* 1 if write-protected, 0 if not, -1 dunno */
195 struct dbdma_cmd *dma_cmd;
196 int ref_count;
197 int expect_cyl;
198 struct timer_list timeout;
199 int timeout_pending;
200 int ejected;
201 wait_queue_head_t wait;
202 int wanted;
203 struct device_node* media_bay; /* NULL when not in bay */
204 char dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)];
205 };
206
207 static struct floppy_state floppy_states[MAX_FLOPPIES];
208 static int floppy_count = 0;
209 static DEFINE_SPINLOCK(swim3_lock);
210
211 static unsigned short write_preamble[] = {
212 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */
213 0, 0, 0, 0, 0, 0, /* sync field */
214 0x99a1, 0x99a1, 0x99a1, 0x99fb, /* data address mark */
215 0x990f /* no escape for 512 bytes */
216 };
217
218 static unsigned short write_postamble[] = {
219 0x9904, /* insert CRC */
220 0x4e4e, 0x4e4e,
221 0x9908, /* stop writing */
222 0, 0, 0, 0, 0, 0
223 };
224
225 static void swim3_select(struct floppy_state *fs, int sel);
226 static void swim3_action(struct floppy_state *fs, int action);
227 static int swim3_readbit(struct floppy_state *fs, int bit);
228 static void do_fd_request(struct request_queue * q);
229 static void start_request(struct floppy_state *fs);
230 static void set_timeout(struct floppy_state *fs, int nticks,
231 void (*proc)(unsigned long));
232 static void scan_track(struct floppy_state *fs);
233 static void seek_track(struct floppy_state *fs, int n);
234 static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count);
235 static void setup_transfer(struct floppy_state *fs);
236 static void act(struct floppy_state *fs);
237 static void scan_timeout(unsigned long data);
238 static void seek_timeout(unsigned long data);
239 static void settle_timeout(unsigned long data);
240 static void xfer_timeout(unsigned long data);
241 static irqreturn_t swim3_interrupt(int irq, void *dev_id);
242 /*static void fd_dma_interrupt(int irq, void *dev_id);*/
243 static int grab_drive(struct floppy_state *fs, enum swim_state state,
244 int interruptible);
245 static void release_drive(struct floppy_state *fs);
246 static int fd_eject(struct floppy_state *fs);
247 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
248 unsigned int cmd, unsigned long param);
249 static int floppy_open(struct block_device *bdev, fmode_t mode);
250 static int floppy_release(struct gendisk *disk, fmode_t mode);
251 static int floppy_check_change(struct gendisk *disk);
252 static int floppy_revalidate(struct gendisk *disk);
253
254 static void swim3_select(struct floppy_state *fs, int sel)
255 {
256 struct swim3 __iomem *sw = fs->swim3;
257
258 out_8(&sw->select, RELAX);
259 if (sel & 8)
260 out_8(&sw->control_bis, SELECT);
261 else
262 out_8(&sw->control_bic, SELECT);
263 out_8(&sw->select, sel & CA_MASK);
264 }
265
266 static void swim3_action(struct floppy_state *fs, int action)
267 {
268 struct swim3 __iomem *sw = fs->swim3;
269
270 swim3_select(fs, action);
271 udelay(1);
272 out_8(&sw->select, sw->select | LSTRB);
273 udelay(2);
274 out_8(&sw->select, sw->select & ~LSTRB);
275 udelay(1);
276 }
277
278 static int swim3_readbit(struct floppy_state *fs, int bit)
279 {
280 struct swim3 __iomem *sw = fs->swim3;
281 int stat;
282
283 swim3_select(fs, bit);
284 udelay(1);
285 stat = in_8(&sw->status);
286 return (stat & DATA) == 0;
287 }
288
289 static void do_fd_request(struct request_queue * q)
290 {
291 int i;
292 for(i=0;i<floppy_count;i++)
293 {
294 #ifdef CONFIG_PMAC_MEDIABAY
295 if (floppy_states[i].media_bay &&
296 check_media_bay(floppy_states[i].media_bay, MB_FD))
297 continue;
298 #endif /* CONFIG_PMAC_MEDIABAY */
299 start_request(&floppy_states[i]);
300 }
301 }
302
303 static void start_request(struct floppy_state *fs)
304 {
305 struct request *req;
306 unsigned long x;
307
308 if (fs->state == idle && fs->wanted) {
309 fs->state = available;
310 wake_up(&fs->wait);
311 return;
312 }
313 while (fs->state == idle && (req = elv_next_request(swim3_queue))) {
314 #if 0
315 printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%ld buf=%p\n",
316 req->rq_disk->disk_name, req->cmd,
317 (long)req->sector, req->nr_sectors, req->buffer);
318 printk(" errors=%d current_nr_sectors=%ld\n",
319 req->errors, req->current_nr_sectors);
320 #endif
321
322 if (req->sector < 0 || req->sector >= fs->total_secs) {
323 end_request(req, 0);
324 continue;
325 }
326 if (req->current_nr_sectors == 0) {
327 end_request(req, 1);
328 continue;
329 }
330 if (fs->ejected) {
331 end_request(req, 0);
332 continue;
333 }
334
335 if (rq_data_dir(req) == WRITE) {
336 if (fs->write_prot < 0)
337 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
338 if (fs->write_prot) {
339 end_request(req, 0);
340 continue;
341 }
342 }
343
344 /* Do not remove the cast. req->sector is now a sector_t and
345 * can be 64 bits, but it will never go past 32 bits for this
346 * driver anyway, so we can safely cast it down and not have
347 * to do a 64/32 division
348 */
349 fs->req_cyl = ((long)req->sector) / fs->secpercyl;
350 x = ((long)req->sector) % fs->secpercyl;
351 fs->head = x / fs->secpertrack;
352 fs->req_sector = x % fs->secpertrack + 1;
353 fd_req = req;
354 fs->state = do_transfer;
355 fs->retries = 0;
356
357 act(fs);
358 }
359 }
360
361 static void set_timeout(struct floppy_state *fs, int nticks,
362 void (*proc)(unsigned long))
363 {
364 unsigned long flags;
365
366 spin_lock_irqsave(&fs->lock, flags);
367 if (fs->timeout_pending)
368 del_timer(&fs->timeout);
369 fs->timeout.expires = jiffies + nticks;
370 fs->timeout.function = proc;
371 fs->timeout.data = (unsigned long) fs;
372 add_timer(&fs->timeout);
373 fs->timeout_pending = 1;
374 spin_unlock_irqrestore(&fs->lock, flags);
375 }
376
377 static inline void scan_track(struct floppy_state *fs)
378 {
379 struct swim3 __iomem *sw = fs->swim3;
380
381 swim3_select(fs, READ_DATA_0);
382 in_8(&sw->intr); /* clear SEEN_SECTOR bit */
383 in_8(&sw->error);
384 out_8(&sw->intr_enable, SEEN_SECTOR);
385 out_8(&sw->control_bis, DO_ACTION);
386 /* enable intr when track found */
387 set_timeout(fs, HZ, scan_timeout); /* enable timeout */
388 }
389
390 static inline void seek_track(struct floppy_state *fs, int n)
391 {
392 struct swim3 __iomem *sw = fs->swim3;
393
394 if (n >= 0) {
395 swim3_action(fs, SEEK_POSITIVE);
396 sw->nseek = n;
397 } else {
398 swim3_action(fs, SEEK_NEGATIVE);
399 sw->nseek = -n;
400 }
401 fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
402 swim3_select(fs, STEP);
403 in_8(&sw->error);
404 /* enable intr when seek finished */
405 out_8(&sw->intr_enable, SEEK_DONE);
406 out_8(&sw->control_bis, DO_SEEK);
407 set_timeout(fs, 3*HZ, seek_timeout); /* enable timeout */
408 fs->settle_time = 0;
409 }
410
411 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
412 void *buf, int count)
413 {
414 st_le16(&cp->req_count, count);
415 st_le16(&cp->command, cmd);
416 st_le32(&cp->phy_addr, virt_to_bus(buf));
417 cp->xfer_status = 0;
418 }
419
420 static inline void setup_transfer(struct floppy_state *fs)
421 {
422 int n;
423 struct swim3 __iomem *sw = fs->swim3;
424 struct dbdma_cmd *cp = fs->dma_cmd;
425 struct dbdma_regs __iomem *dr = fs->dma;
426
427 if (fd_req->current_nr_sectors <= 0) {
428 printk(KERN_ERR "swim3: transfer 0 sectors?\n");
429 return;
430 }
431 if (rq_data_dir(fd_req) == WRITE)
432 n = 1;
433 else {
434 n = fs->secpertrack - fs->req_sector + 1;
435 if (n > fd_req->current_nr_sectors)
436 n = fd_req->current_nr_sectors;
437 }
438 fs->scount = n;
439 swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
440 out_8(&sw->sector, fs->req_sector);
441 out_8(&sw->nsect, n);
442 out_8(&sw->gap3, 0);
443 out_le32(&dr->cmdptr, virt_to_bus(cp));
444 if (rq_data_dir(fd_req) == WRITE) {
445 /* Set up 3 dma commands: write preamble, data, postamble */
446 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
447 ++cp;
448 init_dma(cp, OUTPUT_MORE, fd_req->buffer, 512);
449 ++cp;
450 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
451 } else {
452 init_dma(cp, INPUT_LAST, fd_req->buffer, n * 512);
453 }
454 ++cp;
455 out_le16(&cp->command, DBDMA_STOP);
456 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
457 in_8(&sw->error);
458 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
459 if (rq_data_dir(fd_req) == WRITE)
460 out_8(&sw->control_bis, WRITE_SECTORS);
461 in_8(&sw->intr);
462 out_le32(&dr->control, (RUN << 16) | RUN);
463 /* enable intr when transfer complete */
464 out_8(&sw->intr_enable, TRANSFER_DONE);
465 out_8(&sw->control_bis, DO_ACTION);
466 set_timeout(fs, 2*HZ, xfer_timeout); /* enable timeout */
467 }
468
469 static void act(struct floppy_state *fs)
470 {
471 for (;;) {
472 switch (fs->state) {
473 case idle:
474 return; /* XXX shouldn't get here */
475
476 case locating:
477 if (swim3_readbit(fs, TRACK_ZERO)) {
478 fs->cur_cyl = 0;
479 if (fs->req_cyl == 0)
480 fs->state = do_transfer;
481 else
482 fs->state = seeking;
483 break;
484 }
485 scan_track(fs);
486 return;
487
488 case seeking:
489 if (fs->cur_cyl < 0) {
490 fs->expect_cyl = -1;
491 fs->state = locating;
492 break;
493 }
494 if (fs->req_cyl == fs->cur_cyl) {
495 printk("whoops, seeking 0\n");
496 fs->state = do_transfer;
497 break;
498 }
499 seek_track(fs, fs->req_cyl - fs->cur_cyl);
500 return;
501
502 case settling:
503 /* check for SEEK_COMPLETE after 30ms */
504 fs->settle_time = (HZ + 32) / 33;
505 set_timeout(fs, fs->settle_time, settle_timeout);
506 return;
507
508 case do_transfer:
509 if (fs->cur_cyl != fs->req_cyl) {
510 if (fs->retries > 5) {
511 end_request(fd_req, 0);
512 fs->state = idle;
513 return;
514 }
515 fs->state = seeking;
516 break;
517 }
518 setup_transfer(fs);
519 return;
520
521 case jogging:
522 seek_track(fs, -5);
523 return;
524
525 default:
526 printk(KERN_ERR"swim3: unknown state %d\n", fs->state);
527 return;
528 }
529 }
530 }
531
532 static void scan_timeout(unsigned long data)
533 {
534 struct floppy_state *fs = (struct floppy_state *) data;
535 struct swim3 __iomem *sw = fs->swim3;
536
537 fs->timeout_pending = 0;
538 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
539 out_8(&sw->select, RELAX);
540 out_8(&sw->intr_enable, 0);
541 fs->cur_cyl = -1;
542 if (fs->retries > 5) {
543 end_request(fd_req, 0);
544 fs->state = idle;
545 start_request(fs);
546 } else {
547 fs->state = jogging;
548 act(fs);
549 }
550 }
551
552 static void seek_timeout(unsigned long data)
553 {
554 struct floppy_state *fs = (struct floppy_state *) data;
555 struct swim3 __iomem *sw = fs->swim3;
556
557 fs->timeout_pending = 0;
558 out_8(&sw->control_bic, DO_SEEK);
559 out_8(&sw->select, RELAX);
560 out_8(&sw->intr_enable, 0);
561 printk(KERN_ERR "swim3: seek timeout\n");
562 end_request(fd_req, 0);
563 fs->state = idle;
564 start_request(fs);
565 }
566
567 static void settle_timeout(unsigned long data)
568 {
569 struct floppy_state *fs = (struct floppy_state *) data;
570 struct swim3 __iomem *sw = fs->swim3;
571
572 fs->timeout_pending = 0;
573 if (swim3_readbit(fs, SEEK_COMPLETE)) {
574 out_8(&sw->select, RELAX);
575 fs->state = locating;
576 act(fs);
577 return;
578 }
579 out_8(&sw->select, RELAX);
580 if (fs->settle_time < 2*HZ) {
581 ++fs->settle_time;
582 set_timeout(fs, 1, settle_timeout);
583 return;
584 }
585 printk(KERN_ERR "swim3: seek settle timeout\n");
586 end_request(fd_req, 0);
587 fs->state = idle;
588 start_request(fs);
589 }
590
591 static void xfer_timeout(unsigned long data)
592 {
593 struct floppy_state *fs = (struct floppy_state *) data;
594 struct swim3 __iomem *sw = fs->swim3;
595 struct dbdma_regs __iomem *dr = fs->dma;
596 struct dbdma_cmd *cp = fs->dma_cmd;
597 unsigned long s;
598 int n;
599
600 fs->timeout_pending = 0;
601 out_le32(&dr->control, RUN << 16);
602 /* We must wait a bit for dbdma to stop */
603 for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
604 udelay(1);
605 out_8(&sw->intr_enable, 0);
606 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
607 out_8(&sw->select, RELAX);
608 if (rq_data_dir(fd_req) == WRITE)
609 ++cp;
610 if (ld_le16(&cp->xfer_status) != 0)
611 s = fs->scount - ((ld_le16(&cp->res_count) + 511) >> 9);
612 else
613 s = 0;
614 fd_req->sector += s;
615 fd_req->current_nr_sectors -= s;
616 printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
617 (rq_data_dir(fd_req)==WRITE? "writ": "read"), (long)fd_req->sector);
618 end_request(fd_req, 0);
619 fs->state = idle;
620 start_request(fs);
621 }
622
623 static irqreturn_t swim3_interrupt(int irq, void *dev_id)
624 {
625 struct floppy_state *fs = (struct floppy_state *) dev_id;
626 struct swim3 __iomem *sw = fs->swim3;
627 int intr, err, n;
628 int stat, resid;
629 struct dbdma_regs __iomem *dr;
630 struct dbdma_cmd *cp;
631
632 intr = in_8(&sw->intr);
633 err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
634 if ((intr & ERROR_INTR) && fs->state != do_transfer)
635 printk(KERN_ERR "swim3_interrupt, state=%d, dir=%x, intr=%x, err=%x\n",
636 fs->state, rq_data_dir(fd_req), intr, err);
637 switch (fs->state) {
638 case locating:
639 if (intr & SEEN_SECTOR) {
640 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
641 out_8(&sw->select, RELAX);
642 out_8(&sw->intr_enable, 0);
643 del_timer(&fs->timeout);
644 fs->timeout_pending = 0;
645 if (sw->ctrack == 0xff) {
646 printk(KERN_ERR "swim3: seen sector but cyl=ff?\n");
647 fs->cur_cyl = -1;
648 if (fs->retries > 5) {
649 end_request(fd_req, 0);
650 fs->state = idle;
651 start_request(fs);
652 } else {
653 fs->state = jogging;
654 act(fs);
655 }
656 break;
657 }
658 fs->cur_cyl = sw->ctrack;
659 fs->cur_sector = sw->csect;
660 if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
661 printk(KERN_ERR "swim3: expected cyl %d, got %d\n",
662 fs->expect_cyl, fs->cur_cyl);
663 fs->state = do_transfer;
664 act(fs);
665 }
666 break;
667 case seeking:
668 case jogging:
669 if (sw->nseek == 0) {
670 out_8(&sw->control_bic, DO_SEEK);
671 out_8(&sw->select, RELAX);
672 out_8(&sw->intr_enable, 0);
673 del_timer(&fs->timeout);
674 fs->timeout_pending = 0;
675 if (fs->state == seeking)
676 ++fs->retries;
677 fs->state = settling;
678 act(fs);
679 }
680 break;
681 case settling:
682 out_8(&sw->intr_enable, 0);
683 del_timer(&fs->timeout);
684 fs->timeout_pending = 0;
685 act(fs);
686 break;
687 case do_transfer:
688 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
689 break;
690 out_8(&sw->intr_enable, 0);
691 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
692 out_8(&sw->select, RELAX);
693 del_timer(&fs->timeout);
694 fs->timeout_pending = 0;
695 dr = fs->dma;
696 cp = fs->dma_cmd;
697 if (rq_data_dir(fd_req) == WRITE)
698 ++cp;
699 /*
700 * Check that the main data transfer has finished.
701 * On writing, the swim3 sometimes doesn't use
702 * up all the bytes of the postamble, so we can still
703 * see DMA active here. That doesn't matter as long
704 * as all the sector data has been transferred.
705 */
706 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
707 /* wait a little while for DMA to complete */
708 for (n = 0; n < 100; ++n) {
709 if (cp->xfer_status != 0)
710 break;
711 udelay(1);
712 barrier();
713 }
714 }
715 /* turn off DMA */
716 out_le32(&dr->control, (RUN | PAUSE) << 16);
717 stat = ld_le16(&cp->xfer_status);
718 resid = ld_le16(&cp->res_count);
719 if (intr & ERROR_INTR) {
720 n = fs->scount - 1 - resid / 512;
721 if (n > 0) {
722 fd_req->sector += n;
723 fd_req->current_nr_sectors -= n;
724 fd_req->buffer += n * 512;
725 fs->req_sector += n;
726 }
727 if (fs->retries < 5) {
728 ++fs->retries;
729 act(fs);
730 } else {
731 printk("swim3: error %sing block %ld (err=%x)\n",
732 rq_data_dir(fd_req) == WRITE? "writ": "read",
733 (long)fd_req->sector, err);
734 end_request(fd_req, 0);
735 fs->state = idle;
736 }
737 } else {
738 if ((stat & ACTIVE) == 0 || resid != 0) {
739 /* musta been an error */
740 printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid);
741 printk(KERN_ERR " state=%d, dir=%x, intr=%x, err=%x\n",
742 fs->state, rq_data_dir(fd_req), intr, err);
743 end_request(fd_req, 0);
744 fs->state = idle;
745 start_request(fs);
746 break;
747 }
748 fd_req->sector += fs->scount;
749 fd_req->current_nr_sectors -= fs->scount;
750 fd_req->buffer += fs->scount * 512;
751 if (fd_req->current_nr_sectors <= 0) {
752 end_request(fd_req, 1);
753 fs->state = idle;
754 } else {
755 fs->req_sector += fs->scount;
756 if (fs->req_sector > fs->secpertrack) {
757 fs->req_sector -= fs->secpertrack;
758 if (++fs->head > 1) {
759 fs->head = 0;
760 ++fs->req_cyl;
761 }
762 }
763 act(fs);
764 }
765 }
766 if (fs->state == idle)
767 start_request(fs);
768 break;
769 default:
770 printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state);
771 }
772 return IRQ_HANDLED;
773 }
774
775 /*
776 static void fd_dma_interrupt(int irq, void *dev_id)
777 {
778 }
779 */
780
781 static int grab_drive(struct floppy_state *fs, enum swim_state state,
782 int interruptible)
783 {
784 unsigned long flags;
785
786 spin_lock_irqsave(&fs->lock, flags);
787 if (fs->state != idle) {
788 ++fs->wanted;
789 while (fs->state != available) {
790 if (interruptible && signal_pending(current)) {
791 --fs->wanted;
792 spin_unlock_irqrestore(&fs->lock, flags);
793 return -EINTR;
794 }
795 interruptible_sleep_on(&fs->wait);
796 }
797 --fs->wanted;
798 }
799 fs->state = state;
800 spin_unlock_irqrestore(&fs->lock, flags);
801 return 0;
802 }
803
804 static void release_drive(struct floppy_state *fs)
805 {
806 unsigned long flags;
807
808 spin_lock_irqsave(&fs->lock, flags);
809 fs->state = idle;
810 start_request(fs);
811 spin_unlock_irqrestore(&fs->lock, flags);
812 }
813
814 static int fd_eject(struct floppy_state *fs)
815 {
816 int err, n;
817
818 err = grab_drive(fs, ejecting, 1);
819 if (err)
820 return err;
821 swim3_action(fs, EJECT);
822 for (n = 20; n > 0; --n) {
823 if (signal_pending(current)) {
824 err = -EINTR;
825 break;
826 }
827 swim3_select(fs, RELAX);
828 schedule_timeout_interruptible(1);
829 if (swim3_readbit(fs, DISK_IN) == 0)
830 break;
831 }
832 swim3_select(fs, RELAX);
833 udelay(150);
834 fs->ejected = 1;
835 release_drive(fs);
836 return err;
837 }
838
839 static struct floppy_struct floppy_type =
840 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL }; /* 7 1.44MB 3.5" */
841
842 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
843 unsigned int cmd, unsigned long param)
844 {
845 struct floppy_state *fs = bdev->bd_disk->private_data;
846 int err;
847
848 if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
849 return -EPERM;
850
851 #ifdef CONFIG_PMAC_MEDIABAY
852 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
853 return -ENXIO;
854 #endif
855
856 switch (cmd) {
857 case FDEJECT:
858 if (fs->ref_count != 1)
859 return -EBUSY;
860 err = fd_eject(fs);
861 return err;
862 case FDGETPRM:
863 if (copy_to_user((void __user *) param, &floppy_type,
864 sizeof(struct floppy_struct)))
865 return -EFAULT;
866 return 0;
867 }
868 return -ENOTTY;
869 }
870
871 static int floppy_open(struct block_device *bdev, fmode_t mode)
872 {
873 struct floppy_state *fs = bdev->bd_disk->private_data;
874 struct swim3 __iomem *sw = fs->swim3;
875 int n, err = 0;
876
877 if (fs->ref_count == 0) {
878 #ifdef CONFIG_PMAC_MEDIABAY
879 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
880 return -ENXIO;
881 #endif
882 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
883 out_8(&sw->control_bic, 0xff);
884 out_8(&sw->mode, 0x95);
885 udelay(10);
886 out_8(&sw->intr_enable, 0);
887 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
888 swim3_action(fs, MOTOR_ON);
889 fs->write_prot = -1;
890 fs->cur_cyl = -1;
891 for (n = 0; n < 2 * HZ; ++n) {
892 if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
893 break;
894 if (signal_pending(current)) {
895 err = -EINTR;
896 break;
897 }
898 swim3_select(fs, RELAX);
899 schedule_timeout_interruptible(1);
900 }
901 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
902 || swim3_readbit(fs, DISK_IN) == 0))
903 err = -ENXIO;
904 swim3_action(fs, SETMFM);
905 swim3_select(fs, RELAX);
906
907 } else if (fs->ref_count == -1 || mode & FMODE_EXCL)
908 return -EBUSY;
909
910 if (err == 0 && (mode & FMODE_NDELAY) == 0
911 && (mode & (FMODE_READ|FMODE_WRITE))) {
912 check_disk_change(bdev);
913 if (fs->ejected)
914 err = -ENXIO;
915 }
916
917 if (err == 0 && (mode & FMODE_WRITE)) {
918 if (fs->write_prot < 0)
919 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
920 if (fs->write_prot)
921 err = -EROFS;
922 }
923
924 if (err) {
925 if (fs->ref_count == 0) {
926 swim3_action(fs, MOTOR_OFF);
927 out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
928 swim3_select(fs, RELAX);
929 }
930 return err;
931 }
932
933 if (mode & FMODE_EXCL)
934 fs->ref_count = -1;
935 else
936 ++fs->ref_count;
937
938 return 0;
939 }
940
941 static int floppy_release(struct gendisk *disk, fmode_t mode)
942 {
943 struct floppy_state *fs = disk->private_data;
944 struct swim3 __iomem *sw = fs->swim3;
945 if (fs->ref_count > 0 && --fs->ref_count == 0) {
946 swim3_action(fs, MOTOR_OFF);
947 out_8(&sw->control_bic, 0xff);
948 swim3_select(fs, RELAX);
949 }
950 return 0;
951 }
952
953 static int floppy_check_change(struct gendisk *disk)
954 {
955 struct floppy_state *fs = disk->private_data;
956 return fs->ejected;
957 }
958
959 static int floppy_revalidate(struct gendisk *disk)
960 {
961 struct floppy_state *fs = disk->private_data;
962 struct swim3 __iomem *sw;
963 int ret, n;
964
965 #ifdef CONFIG_PMAC_MEDIABAY
966 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
967 return -ENXIO;
968 #endif
969
970 sw = fs->swim3;
971 grab_drive(fs, revalidating, 0);
972 out_8(&sw->intr_enable, 0);
973 out_8(&sw->control_bis, DRIVE_ENABLE);
974 swim3_action(fs, MOTOR_ON); /* necessary? */
975 fs->write_prot = -1;
976 fs->cur_cyl = -1;
977 mdelay(1);
978 for (n = HZ; n > 0; --n) {
979 if (swim3_readbit(fs, SEEK_COMPLETE))
980 break;
981 if (signal_pending(current))
982 break;
983 swim3_select(fs, RELAX);
984 schedule_timeout_interruptible(1);
985 }
986 ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
987 || swim3_readbit(fs, DISK_IN) == 0;
988 if (ret)
989 swim3_action(fs, MOTOR_OFF);
990 else {
991 fs->ejected = 0;
992 swim3_action(fs, SETMFM);
993 }
994 swim3_select(fs, RELAX);
995
996 release_drive(fs);
997 return ret;
998 }
999
1000 static struct block_device_operations floppy_fops = {
1001 .open = floppy_open,
1002 .release = floppy_release,
1003 .locked_ioctl = floppy_ioctl,
1004 .media_changed = floppy_check_change,
1005 .revalidate_disk= floppy_revalidate,
1006 };
1007
1008 static int swim3_add_device(struct macio_dev *mdev, int index)
1009 {
1010 struct device_node *swim = mdev->ofdev.node;
1011 struct device_node *mediabay;
1012 struct floppy_state *fs = &floppy_states[index];
1013 int rc = -EBUSY;
1014
1015 /* Check & Request resources */
1016 if (macio_resource_count(mdev) < 2) {
1017 printk(KERN_WARNING "ifd%d: no address for %s\n",
1018 index, swim->full_name);
1019 return -ENXIO;
1020 }
1021 if (macio_irq_count(mdev) < 2) {
1022 printk(KERN_WARNING "fd%d: no intrs for device %s\n",
1023 index, swim->full_name);
1024 }
1025 if (macio_request_resource(mdev, 0, "swim3 (mmio)")) {
1026 printk(KERN_ERR "fd%d: can't request mmio resource for %s\n",
1027 index, swim->full_name);
1028 return -EBUSY;
1029 }
1030 if (macio_request_resource(mdev, 1, "swim3 (dma)")) {
1031 printk(KERN_ERR "fd%d: can't request dma resource for %s\n",
1032 index, swim->full_name);
1033 macio_release_resource(mdev, 0);
1034 return -EBUSY;
1035 }
1036 dev_set_drvdata(&mdev->ofdev.dev, fs);
1037
1038 mediabay = (strcasecmp(swim->parent->type, "media-bay") == 0) ?
1039 swim->parent : NULL;
1040 if (mediabay == NULL)
1041 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1042
1043 memset(fs, 0, sizeof(*fs));
1044 spin_lock_init(&fs->lock);
1045 fs->state = idle;
1046 fs->swim3 = (struct swim3 __iomem *)
1047 ioremap(macio_resource_start(mdev, 0), 0x200);
1048 if (fs->swim3 == NULL) {
1049 printk("fd%d: couldn't map registers for %s\n",
1050 index, swim->full_name);
1051 rc = -ENOMEM;
1052 goto out_release;
1053 }
1054 fs->dma = (struct dbdma_regs __iomem *)
1055 ioremap(macio_resource_start(mdev, 1), 0x200);
1056 if (fs->dma == NULL) {
1057 printk("fd%d: couldn't map DMA for %s\n",
1058 index, swim->full_name);
1059 iounmap(fs->swim3);
1060 rc = -ENOMEM;
1061 goto out_release;
1062 }
1063 fs->swim3_intr = macio_irq(mdev, 0);
1064 fs->dma_intr = macio_irq(mdev, 1);;
1065 fs->cur_cyl = -1;
1066 fs->cur_sector = -1;
1067 fs->secpercyl = 36;
1068 fs->secpertrack = 18;
1069 fs->total_secs = 2880;
1070 fs->media_bay = mediabay;
1071 init_waitqueue_head(&fs->wait);
1072
1073 fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1074 memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1075 st_le16(&fs->dma_cmd[1].command, DBDMA_STOP);
1076
1077 if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1078 printk(KERN_ERR "fd%d: couldn't request irq %d for %s\n",
1079 index, fs->swim3_intr, swim->full_name);
1080 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1081 goto out_unmap;
1082 return -EBUSY;
1083 }
1084 /*
1085 if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) {
1086 printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA",
1087 fs->dma_intr);
1088 return -EBUSY;
1089 }
1090 */
1091
1092 init_timer(&fs->timeout);
1093
1094 printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count,
1095 mediabay ? "in media bay" : "");
1096
1097 return 0;
1098
1099 out_unmap:
1100 iounmap(fs->dma);
1101 iounmap(fs->swim3);
1102
1103 out_release:
1104 macio_release_resource(mdev, 0);
1105 macio_release_resource(mdev, 1);
1106
1107 return rc;
1108 }
1109
1110 static int __devinit swim3_attach(struct macio_dev *mdev, const struct of_device_id *match)
1111 {
1112 int i, rc;
1113 struct gendisk *disk;
1114
1115 /* Add the drive */
1116 rc = swim3_add_device(mdev, floppy_count);
1117 if (rc)
1118 return rc;
1119
1120 /* Now create the queue if not there yet */
1121 if (swim3_queue == NULL) {
1122 /* If we failed, there isn't much we can do as the driver is still
1123 * too dumb to remove the device, just bail out
1124 */
1125 if (register_blkdev(FLOPPY_MAJOR, "fd"))
1126 return 0;
1127 swim3_queue = blk_init_queue(do_fd_request, &swim3_lock);
1128 if (swim3_queue == NULL) {
1129 unregister_blkdev(FLOPPY_MAJOR, "fd");
1130 return 0;
1131 }
1132 }
1133
1134 /* Now register that disk. Same comment about failure handling */
1135 i = floppy_count++;
1136 disk = disks[i] = alloc_disk(1);
1137 if (disk == NULL)
1138 return 0;
1139
1140 disk->major = FLOPPY_MAJOR;
1141 disk->first_minor = i;
1142 disk->fops = &floppy_fops;
1143 disk->private_data = &floppy_states[i];
1144 disk->queue = swim3_queue;
1145 disk->flags |= GENHD_FL_REMOVABLE;
1146 sprintf(disk->disk_name, "fd%d", i);
1147 set_capacity(disk, 2880);
1148 add_disk(disk);
1149
1150 return 0;
1151 }
1152
1153 static struct of_device_id swim3_match[] =
1154 {
1155 {
1156 .name = "swim3",
1157 },
1158 {
1159 .compatible = "ohare-swim3"
1160 },
1161 {
1162 .compatible = "swim3"
1163 },
1164 };
1165
1166 static struct macio_driver swim3_driver =
1167 {
1168 .name = "swim3",
1169 .match_table = swim3_match,
1170 .probe = swim3_attach,
1171 #if 0
1172 .suspend = swim3_suspend,
1173 .resume = swim3_resume,
1174 #endif
1175 };
1176
1177
1178 int swim3_init(void)
1179 {
1180 macio_register_driver(&swim3_driver);
1181 return 0;
1182 }
1183
1184 module_init(swim3_init)
1185
1186 MODULE_LICENSE("GPL");
1187 MODULE_AUTHOR("Paul Mackerras");
1188 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);
Support for the Chinese Samsung S3C2440 based development boards