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NFS: Fix a bug in nfs_fscache_release_page()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / block / swim3.c
blob80df93e3cdd05f0d9c219b6d18bbf8b7a6de517d
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 bool swim3_end_request(int err, unsigned int nr_bytes)
255 {
256 if (__blk_end_request(fd_req, err, nr_bytes))
257 return true;
258
259 fd_req = NULL;
260 return false;
261 }
262
263 static bool swim3_end_request_cur(int err)
264 {
265 return swim3_end_request(err, blk_rq_cur_bytes(fd_req));
266 }
267
268 static void swim3_select(struct floppy_state *fs, int sel)
269 {
270 struct swim3 __iomem *sw = fs->swim3;
271
272 out_8(&sw->select, RELAX);
273 if (sel & 8)
274 out_8(&sw->control_bis, SELECT);
275 else
276 out_8(&sw->control_bic, SELECT);
277 out_8(&sw->select, sel & CA_MASK);
278 }
279
280 static void swim3_action(struct floppy_state *fs, int action)
281 {
282 struct swim3 __iomem *sw = fs->swim3;
283
284 swim3_select(fs, action);
285 udelay(1);
286 out_8(&sw->select, sw->select | LSTRB);
287 udelay(2);
288 out_8(&sw->select, sw->select & ~LSTRB);
289 udelay(1);
290 }
291
292 static int swim3_readbit(struct floppy_state *fs, int bit)
293 {
294 struct swim3 __iomem *sw = fs->swim3;
295 int stat;
296
297 swim3_select(fs, bit);
298 udelay(1);
299 stat = in_8(&sw->status);
300 return (stat & DATA) == 0;
301 }
302
303 static void do_fd_request(struct request_queue * q)
304 {
305 int i;
306 for(i=0;i<floppy_count;i++)
307 {
308 #ifdef CONFIG_PMAC_MEDIABAY
309 if (floppy_states[i].media_bay &&
310 check_media_bay(floppy_states[i].media_bay, MB_FD))
311 continue;
312 #endif /* CONFIG_PMAC_MEDIABAY */
313 start_request(&floppy_states[i]);
314 }
315 }
316
317 static void start_request(struct floppy_state *fs)
318 {
319 struct request *req;
320 unsigned long x;
321
322 if (fs->state == idle && fs->wanted) {
323 fs->state = available;
324 wake_up(&fs->wait);
325 return;
326 }
327 while (fs->state == idle) {
328 if (!fd_req) {
329 fd_req = blk_fetch_request(swim3_queue);
330 if (!fd_req)
331 break;
332 }
333 req = fd_req;
334 #if 0
335 printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%u buf=%p\n",
336 req->rq_disk->disk_name, req->cmd,
337 (long)blk_rq_pos(req), blk_rq_sectors(req), req->buffer);
338 printk(" errors=%d current_nr_sectors=%u\n",
339 req->errors, blk_rq_cur_sectors(req));
340 #endif
341
342 if (blk_rq_pos(req) >= fs->total_secs) {
343 swim3_end_request_cur(-EIO);
344 continue;
345 }
346 if (fs->ejected) {
347 swim3_end_request_cur(-EIO);
348 continue;
349 }
350
351 if (rq_data_dir(req) == WRITE) {
352 if (fs->write_prot < 0)
353 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
354 if (fs->write_prot) {
355 swim3_end_request_cur(-EIO);
356 continue;
357 }
358 }
359
360 /* Do not remove the cast. blk_rq_pos(req) is now a
361 * sector_t and can be 64 bits, but it will never go
362 * past 32 bits for this driver anyway, so we can
363 * safely cast it down and not have to do a 64/32
364 * division
365 */
366 fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl;
367 x = ((long)blk_rq_pos(req)) % fs->secpercyl;
368 fs->head = x / fs->secpertrack;
369 fs->req_sector = x % fs->secpertrack + 1;
370 fd_req = req;
371 fs->state = do_transfer;
372 fs->retries = 0;
373
374 act(fs);
375 }
376 }
377
378 static void set_timeout(struct floppy_state *fs, int nticks,
379 void (*proc)(unsigned long))
380 {
381 unsigned long flags;
382
383 spin_lock_irqsave(&fs->lock, flags);
384 if (fs->timeout_pending)
385 del_timer(&fs->timeout);
386 fs->timeout.expires = jiffies + nticks;
387 fs->timeout.function = proc;
388 fs->timeout.data = (unsigned long) fs;
389 add_timer(&fs->timeout);
390 fs->timeout_pending = 1;
391 spin_unlock_irqrestore(&fs->lock, flags);
392 }
393
394 static inline void scan_track(struct floppy_state *fs)
395 {
396 struct swim3 __iomem *sw = fs->swim3;
397
398 swim3_select(fs, READ_DATA_0);
399 in_8(&sw->intr); /* clear SEEN_SECTOR bit */
400 in_8(&sw->error);
401 out_8(&sw->intr_enable, SEEN_SECTOR);
402 out_8(&sw->control_bis, DO_ACTION);
403 /* enable intr when track found */
404 set_timeout(fs, HZ, scan_timeout); /* enable timeout */
405 }
406
407 static inline void seek_track(struct floppy_state *fs, int n)
408 {
409 struct swim3 __iomem *sw = fs->swim3;
410
411 if (n >= 0) {
412 swim3_action(fs, SEEK_POSITIVE);
413 sw->nseek = n;
414 } else {
415 swim3_action(fs, SEEK_NEGATIVE);
416 sw->nseek = -n;
417 }
418 fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
419 swim3_select(fs, STEP);
420 in_8(&sw->error);
421 /* enable intr when seek finished */
422 out_8(&sw->intr_enable, SEEK_DONE);
423 out_8(&sw->control_bis, DO_SEEK);
424 set_timeout(fs, 3*HZ, seek_timeout); /* enable timeout */
425 fs->settle_time = 0;
426 }
427
428 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
429 void *buf, int count)
430 {
431 st_le16(&cp->req_count, count);
432 st_le16(&cp->command, cmd);
433 st_le32(&cp->phy_addr, virt_to_bus(buf));
434 cp->xfer_status = 0;
435 }
436
437 static inline void setup_transfer(struct floppy_state *fs)
438 {
439 int n;
440 struct swim3 __iomem *sw = fs->swim3;
441 struct dbdma_cmd *cp = fs->dma_cmd;
442 struct dbdma_regs __iomem *dr = fs->dma;
443
444 if (blk_rq_cur_sectors(fd_req) <= 0) {
445 printk(KERN_ERR "swim3: transfer 0 sectors?\n");
446 return;
447 }
448 if (rq_data_dir(fd_req) == WRITE)
449 n = 1;
450 else {
451 n = fs->secpertrack - fs->req_sector + 1;
452 if (n > blk_rq_cur_sectors(fd_req))
453 n = blk_rq_cur_sectors(fd_req);
454 }
455 fs->scount = n;
456 swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
457 out_8(&sw->sector, fs->req_sector);
458 out_8(&sw->nsect, n);
459 out_8(&sw->gap3, 0);
460 out_le32(&dr->cmdptr, virt_to_bus(cp));
461 if (rq_data_dir(fd_req) == WRITE) {
462 /* Set up 3 dma commands: write preamble, data, postamble */
463 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
464 ++cp;
465 init_dma(cp, OUTPUT_MORE, fd_req->buffer, 512);
466 ++cp;
467 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
468 } else {
469 init_dma(cp, INPUT_LAST, fd_req->buffer, n * 512);
470 }
471 ++cp;
472 out_le16(&cp->command, DBDMA_STOP);
473 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
474 in_8(&sw->error);
475 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
476 if (rq_data_dir(fd_req) == WRITE)
477 out_8(&sw->control_bis, WRITE_SECTORS);
478 in_8(&sw->intr);
479 out_le32(&dr->control, (RUN << 16) | RUN);
480 /* enable intr when transfer complete */
481 out_8(&sw->intr_enable, TRANSFER_DONE);
482 out_8(&sw->control_bis, DO_ACTION);
483 set_timeout(fs, 2*HZ, xfer_timeout); /* enable timeout */
484 }
485
486 static void act(struct floppy_state *fs)
487 {
488 for (;;) {
489 switch (fs->state) {
490 case idle:
491 return; /* XXX shouldn't get here */
492
493 case locating:
494 if (swim3_readbit(fs, TRACK_ZERO)) {
495 fs->cur_cyl = 0;
496 if (fs->req_cyl == 0)
497 fs->state = do_transfer;
498 else
499 fs->state = seeking;
500 break;
501 }
502 scan_track(fs);
503 return;
504
505 case seeking:
506 if (fs->cur_cyl < 0) {
507 fs->expect_cyl = -1;
508 fs->state = locating;
509 break;
510 }
511 if (fs->req_cyl == fs->cur_cyl) {
512 printk("whoops, seeking 0\n");
513 fs->state = do_transfer;
514 break;
515 }
516 seek_track(fs, fs->req_cyl - fs->cur_cyl);
517 return;
518
519 case settling:
520 /* check for SEEK_COMPLETE after 30ms */
521 fs->settle_time = (HZ + 32) / 33;
522 set_timeout(fs, fs->settle_time, settle_timeout);
523 return;
524
525 case do_transfer:
526 if (fs->cur_cyl != fs->req_cyl) {
527 if (fs->retries > 5) {
528 swim3_end_request_cur(-EIO);
529 fs->state = idle;
530 return;
531 }
532 fs->state = seeking;
533 break;
534 }
535 setup_transfer(fs);
536 return;
537
538 case jogging:
539 seek_track(fs, -5);
540 return;
541
542 default:
543 printk(KERN_ERR"swim3: unknown state %d\n", fs->state);
544 return;
545 }
546 }
547 }
548
549 static void scan_timeout(unsigned long data)
550 {
551 struct floppy_state *fs = (struct floppy_state *) data;
552 struct swim3 __iomem *sw = fs->swim3;
553
554 fs->timeout_pending = 0;
555 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
556 out_8(&sw->select, RELAX);
557 out_8(&sw->intr_enable, 0);
558 fs->cur_cyl = -1;
559 if (fs->retries > 5) {
560 swim3_end_request_cur(-EIO);
561 fs->state = idle;
562 start_request(fs);
563 } else {
564 fs->state = jogging;
565 act(fs);
566 }
567 }
568
569 static void seek_timeout(unsigned long data)
570 {
571 struct floppy_state *fs = (struct floppy_state *) data;
572 struct swim3 __iomem *sw = fs->swim3;
573
574 fs->timeout_pending = 0;
575 out_8(&sw->control_bic, DO_SEEK);
576 out_8(&sw->select, RELAX);
577 out_8(&sw->intr_enable, 0);
578 printk(KERN_ERR "swim3: seek timeout\n");
579 swim3_end_request_cur(-EIO);
580 fs->state = idle;
581 start_request(fs);
582 }
583
584 static void settle_timeout(unsigned long data)
585 {
586 struct floppy_state *fs = (struct floppy_state *) data;
587 struct swim3 __iomem *sw = fs->swim3;
588
589 fs->timeout_pending = 0;
590 if (swim3_readbit(fs, SEEK_COMPLETE)) {
591 out_8(&sw->select, RELAX);
592 fs->state = locating;
593 act(fs);
594 return;
595 }
596 out_8(&sw->select, RELAX);
597 if (fs->settle_time < 2*HZ) {
598 ++fs->settle_time;
599 set_timeout(fs, 1, settle_timeout);
600 return;
601 }
602 printk(KERN_ERR "swim3: seek settle timeout\n");
603 swim3_end_request_cur(-EIO);
604 fs->state = idle;
605 start_request(fs);
606 }
607
608 static void xfer_timeout(unsigned long data)
609 {
610 struct floppy_state *fs = (struct floppy_state *) data;
611 struct swim3 __iomem *sw = fs->swim3;
612 struct dbdma_regs __iomem *dr = fs->dma;
613 int n;
614
615 fs->timeout_pending = 0;
616 out_le32(&dr->control, RUN << 16);
617 /* We must wait a bit for dbdma to stop */
618 for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
619 udelay(1);
620 out_8(&sw->intr_enable, 0);
621 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
622 out_8(&sw->select, RELAX);
623 printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
624 (rq_data_dir(fd_req)==WRITE? "writ": "read"),
625 (long)blk_rq_pos(fd_req));
626 swim3_end_request_cur(-EIO);
627 fs->state = idle;
628 start_request(fs);
629 }
630
631 static irqreturn_t swim3_interrupt(int irq, void *dev_id)
632 {
633 struct floppy_state *fs = (struct floppy_state *) dev_id;
634 struct swim3 __iomem *sw = fs->swim3;
635 int intr, err, n;
636 int stat, resid;
637 struct dbdma_regs __iomem *dr;
638 struct dbdma_cmd *cp;
639
640 intr = in_8(&sw->intr);
641 err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
642 if ((intr & ERROR_INTR) && fs->state != do_transfer)
643 printk(KERN_ERR "swim3_interrupt, state=%d, dir=%x, intr=%x, err=%x\n",
644 fs->state, rq_data_dir(fd_req), intr, err);
645 switch (fs->state) {
646 case locating:
647 if (intr & SEEN_SECTOR) {
648 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
649 out_8(&sw->select, RELAX);
650 out_8(&sw->intr_enable, 0);
651 del_timer(&fs->timeout);
652 fs->timeout_pending = 0;
653 if (sw->ctrack == 0xff) {
654 printk(KERN_ERR "swim3: seen sector but cyl=ff?\n");
655 fs->cur_cyl = -1;
656 if (fs->retries > 5) {
657 swim3_end_request_cur(-EIO);
658 fs->state = idle;
659 start_request(fs);
660 } else {
661 fs->state = jogging;
662 act(fs);
663 }
664 break;
665 }
666 fs->cur_cyl = sw->ctrack;
667 fs->cur_sector = sw->csect;
668 if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
669 printk(KERN_ERR "swim3: expected cyl %d, got %d\n",
670 fs->expect_cyl, fs->cur_cyl);
671 fs->state = do_transfer;
672 act(fs);
673 }
674 break;
675 case seeking:
676 case jogging:
677 if (sw->nseek == 0) {
678 out_8(&sw->control_bic, DO_SEEK);
679 out_8(&sw->select, RELAX);
680 out_8(&sw->intr_enable, 0);
681 del_timer(&fs->timeout);
682 fs->timeout_pending = 0;
683 if (fs->state == seeking)
684 ++fs->retries;
685 fs->state = settling;
686 act(fs);
687 }
688 break;
689 case settling:
690 out_8(&sw->intr_enable, 0);
691 del_timer(&fs->timeout);
692 fs->timeout_pending = 0;
693 act(fs);
694 break;
695 case do_transfer:
696 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
697 break;
698 out_8(&sw->intr_enable, 0);
699 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
700 out_8(&sw->select, RELAX);
701 del_timer(&fs->timeout);
702 fs->timeout_pending = 0;
703 dr = fs->dma;
704 cp = fs->dma_cmd;
705 if (rq_data_dir(fd_req) == WRITE)
706 ++cp;
707 /*
708 * Check that the main data transfer has finished.
709 * On writing, the swim3 sometimes doesn't use
710 * up all the bytes of the postamble, so we can still
711 * see DMA active here. That doesn't matter as long
712 * as all the sector data has been transferred.
713 */
714 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
715 /* wait a little while for DMA to complete */
716 for (n = 0; n < 100; ++n) {
717 if (cp->xfer_status != 0)
718 break;
719 udelay(1);
720 barrier();
721 }
722 }
723 /* turn off DMA */
724 out_le32(&dr->control, (RUN | PAUSE) << 16);
725 stat = ld_le16(&cp->xfer_status);
726 resid = ld_le16(&cp->res_count);
727 if (intr & ERROR_INTR) {
728 n = fs->scount - 1 - resid / 512;
729 if (n > 0) {
730 blk_update_request(fd_req, 0, n << 9);
731 fs->req_sector += n;
732 }
733 if (fs->retries < 5) {
734 ++fs->retries;
735 act(fs);
736 } else {
737 printk("swim3: error %sing block %ld (err=%x)\n",
738 rq_data_dir(fd_req) == WRITE? "writ": "read",
739 (long)blk_rq_pos(fd_req), err);
740 swim3_end_request_cur(-EIO);
741 fs->state = idle;
742 }
743 } else {
744 if ((stat & ACTIVE) == 0 || resid != 0) {
745 /* musta been an error */
746 printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid);
747 printk(KERN_ERR " state=%d, dir=%x, intr=%x, err=%x\n",
748 fs->state, rq_data_dir(fd_req), intr, err);
749 swim3_end_request_cur(-EIO);
750 fs->state = idle;
751 start_request(fs);
752 break;
753 }
754 if (swim3_end_request(0, fs->scount << 9)) {
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 } else
765 fs->state = idle;
766 }
767 if (fs->state == idle)
768 start_request(fs);
769 break;
770 default:
771 printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state);
772 }
773 return IRQ_HANDLED;
774 }
775
776 /*
777 static void fd_dma_interrupt(int irq, void *dev_id)
778 {
779 }
780 */
781
782 static int grab_drive(struct floppy_state *fs, enum swim_state state,
783 int interruptible)
784 {
785 unsigned long flags;
786
787 spin_lock_irqsave(&fs->lock, flags);
788 if (fs->state != idle) {
789 ++fs->wanted;
790 while (fs->state != available) {
791 if (interruptible && signal_pending(current)) {
792 --fs->wanted;
793 spin_unlock_irqrestore(&fs->lock, flags);
794 return -EINTR;
795 }
796 interruptible_sleep_on(&fs->wait);
797 }
798 --fs->wanted;
799 }
800 fs->state = state;
801 spin_unlock_irqrestore(&fs->lock, flags);
802 return 0;
803 }
804
805 static void release_drive(struct floppy_state *fs)
806 {
807 unsigned long flags;
808
809 spin_lock_irqsave(&fs->lock, flags);
810 fs->state = idle;
811 start_request(fs);
812 spin_unlock_irqrestore(&fs->lock, flags);
813 }
814
815 static int fd_eject(struct floppy_state *fs)
816 {
817 int err, n;
818
819 err = grab_drive(fs, ejecting, 1);
820 if (err)
821 return err;
822 swim3_action(fs, EJECT);
823 for (n = 20; n > 0; --n) {
824 if (signal_pending(current)) {
825 err = -EINTR;
826 break;
827 }
828 swim3_select(fs, RELAX);
829 schedule_timeout_interruptible(1);
830 if (swim3_readbit(fs, DISK_IN) == 0)
831 break;
832 }
833 swim3_select(fs, RELAX);
834 udelay(150);
835 fs->ejected = 1;
836 release_drive(fs);
837 return err;
838 }
839
840 static struct floppy_struct floppy_type =
841 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL }; /* 7 1.44MB 3.5" */
842
843 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
844 unsigned int cmd, unsigned long param)
845 {
846 struct floppy_state *fs = bdev->bd_disk->private_data;
847 int err;
848
849 if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
850 return -EPERM;
851
852 #ifdef CONFIG_PMAC_MEDIABAY
853 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
854 return -ENXIO;
855 #endif
856
857 switch (cmd) {
858 case FDEJECT:
859 if (fs->ref_count != 1)
860 return -EBUSY;
861 err = fd_eject(fs);
862 return err;
863 case FDGETPRM:
864 if (copy_to_user((void __user *) param, &floppy_type,
865 sizeof(struct floppy_struct)))
866 return -EFAULT;
867 return 0;
868 }
869 return -ENOTTY;
870 }
871
872 static int floppy_open(struct block_device *bdev, fmode_t mode)
873 {
874 struct floppy_state *fs = bdev->bd_disk->private_data;
875 struct swim3 __iomem *sw = fs->swim3;
876 int n, err = 0;
877
878 if (fs->ref_count == 0) {
879 #ifdef CONFIG_PMAC_MEDIABAY
880 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
881 return -ENXIO;
882 #endif
883 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
884 out_8(&sw->control_bic, 0xff);
885 out_8(&sw->mode, 0x95);
886 udelay(10);
887 out_8(&sw->intr_enable, 0);
888 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
889 swim3_action(fs, MOTOR_ON);
890 fs->write_prot = -1;
891 fs->cur_cyl = -1;
892 for (n = 0; n < 2 * HZ; ++n) {
893 if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
894 break;
895 if (signal_pending(current)) {
896 err = -EINTR;
897 break;
898 }
899 swim3_select(fs, RELAX);
900 schedule_timeout_interruptible(1);
901 }
902 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
903 || swim3_readbit(fs, DISK_IN) == 0))
904 err = -ENXIO;
905 swim3_action(fs, SETMFM);
906 swim3_select(fs, RELAX);
907
908 } else if (fs->ref_count == -1 || mode & FMODE_EXCL)
909 return -EBUSY;
910
911 if (err == 0 && (mode & FMODE_NDELAY) == 0
912 && (mode & (FMODE_READ|FMODE_WRITE))) {
913 check_disk_change(bdev);
914 if (fs->ejected)
915 err = -ENXIO;
916 }
917
918 if (err == 0 && (mode & FMODE_WRITE)) {
919 if (fs->write_prot < 0)
920 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
921 if (fs->write_prot)
922 err = -EROFS;
923 }
924
925 if (err) {
926 if (fs->ref_count == 0) {
927 swim3_action(fs, MOTOR_OFF);
928 out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
929 swim3_select(fs, RELAX);
930 }
931 return err;
932 }
933
934 if (mode & FMODE_EXCL)
935 fs->ref_count = -1;
936 else
937 ++fs->ref_count;
938
939 return 0;
940 }
941
942 static int floppy_release(struct gendisk *disk, fmode_t mode)
943 {
944 struct floppy_state *fs = disk->private_data;
945 struct swim3 __iomem *sw = fs->swim3;
946 if (fs->ref_count > 0 && --fs->ref_count == 0) {
947 swim3_action(fs, MOTOR_OFF);
948 out_8(&sw->control_bic, 0xff);
949 swim3_select(fs, RELAX);
950 }
951 return 0;
952 }
953
954 static int floppy_check_change(struct gendisk *disk)
955 {
956 struct floppy_state *fs = disk->private_data;
957 return fs->ejected;
958 }
959
960 static int floppy_revalidate(struct gendisk *disk)
961 {
962 struct floppy_state *fs = disk->private_data;
963 struct swim3 __iomem *sw;
964 int ret, n;
965
966 #ifdef CONFIG_PMAC_MEDIABAY
967 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
968 return -ENXIO;
969 #endif
970
971 sw = fs->swim3;
972 grab_drive(fs, revalidating, 0);
973 out_8(&sw->intr_enable, 0);
974 out_8(&sw->control_bis, DRIVE_ENABLE);
975 swim3_action(fs, MOTOR_ON); /* necessary? */
976 fs->write_prot = -1;
977 fs->cur_cyl = -1;
978 mdelay(1);
979 for (n = HZ; n > 0; --n) {
980 if (swim3_readbit(fs, SEEK_COMPLETE))
981 break;
982 if (signal_pending(current))
983 break;
984 swim3_select(fs, RELAX);
985 schedule_timeout_interruptible(1);
986 }
987 ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
988 || swim3_readbit(fs, DISK_IN) == 0;
989 if (ret)
990 swim3_action(fs, MOTOR_OFF);
991 else {
992 fs->ejected = 0;
993 swim3_action(fs, SETMFM);
994 }
995 swim3_select(fs, RELAX);
996
997 release_drive(fs);
998 return ret;
999 }
1000
1001 static struct block_device_operations floppy_fops = {
1002 .open = floppy_open,
1003 .release = floppy_release,
1004 .locked_ioctl = floppy_ioctl,
1005 .media_changed = floppy_check_change,
1006 .revalidate_disk= floppy_revalidate,
1007 };
1008
1009 static int swim3_add_device(struct macio_dev *mdev, int index)
1010 {
1011 struct device_node *swim = mdev->ofdev.node;
1012 struct device_node *mediabay;
1013 struct floppy_state *fs = &floppy_states[index];
1014 int rc = -EBUSY;
1015
1016 /* Check & Request resources */
1017 if (macio_resource_count(mdev) < 2) {
1018 printk(KERN_WARNING "ifd%d: no address for %s\n",
1019 index, swim->full_name);
1020 return -ENXIO;
1021 }
1022 if (macio_irq_count(mdev) < 2) {
1023 printk(KERN_WARNING "fd%d: no intrs for device %s\n",
1024 index, swim->full_name);
1025 }
1026 if (macio_request_resource(mdev, 0, "swim3 (mmio)")) {
1027 printk(KERN_ERR "fd%d: can't request mmio resource for %s\n",
1028 index, swim->full_name);
1029 return -EBUSY;
1030 }
1031 if (macio_request_resource(mdev, 1, "swim3 (dma)")) {
1032 printk(KERN_ERR "fd%d: can't request dma resource for %s\n",
1033 index, swim->full_name);
1034 macio_release_resource(mdev, 0);
1035 return -EBUSY;
1036 }
1037 dev_set_drvdata(&mdev->ofdev.dev, fs);
1038
1039 mediabay = (strcasecmp(swim->parent->type, "media-bay") == 0) ?
1040 swim->parent : NULL;
1041 if (mediabay == NULL)
1042 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1043
1044 memset(fs, 0, sizeof(*fs));
1045 spin_lock_init(&fs->lock);
1046 fs->state = idle;
1047 fs->swim3 = (struct swim3 __iomem *)
1048 ioremap(macio_resource_start(mdev, 0), 0x200);
1049 if (fs->swim3 == NULL) {
1050 printk("fd%d: couldn't map registers for %s\n",
1051 index, swim->full_name);
1052 rc = -ENOMEM;
1053 goto out_release;
1054 }
1055 fs->dma = (struct dbdma_regs __iomem *)
1056 ioremap(macio_resource_start(mdev, 1), 0x200);
1057 if (fs->dma == NULL) {
1058 printk("fd%d: couldn't map DMA for %s\n",
1059 index, swim->full_name);
1060 iounmap(fs->swim3);
1061 rc = -ENOMEM;
1062 goto out_release;
1063 }
1064 fs->swim3_intr = macio_irq(mdev, 0);
1065 fs->dma_intr = macio_irq(mdev, 1);;
1066 fs->cur_cyl = -1;
1067 fs->cur_sector = -1;
1068 fs->secpercyl = 36;
1069 fs->secpertrack = 18;
1070 fs->total_secs = 2880;
1071 fs->media_bay = mediabay;
1072 init_waitqueue_head(&fs->wait);
1073
1074 fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1075 memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1076 st_le16(&fs->dma_cmd[1].command, DBDMA_STOP);
1077
1078 if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1079 printk(KERN_ERR "fd%d: couldn't request irq %d for %s\n",
1080 index, fs->swim3_intr, swim->full_name);
1081 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1082 goto out_unmap;
1083 return -EBUSY;
1084 }
1085 /*
1086 if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) {
1087 printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA",
1088 fs->dma_intr);
1089 return -EBUSY;
1090 }
1091 */
1092
1093 init_timer(&fs->timeout);
1094
1095 printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count,
1096 mediabay ? "in media bay" : "");
1097
1098 return 0;
1099
1100 out_unmap:
1101 iounmap(fs->dma);
1102 iounmap(fs->swim3);
1103
1104 out_release:
1105 macio_release_resource(mdev, 0);
1106 macio_release_resource(mdev, 1);
1107
1108 return rc;
1109 }
1110
1111 static int __devinit swim3_attach(struct macio_dev *mdev, const struct of_device_id *match)
1112 {
1113 int i, rc;
1114 struct gendisk *disk;
1115
1116 /* Add the drive */
1117 rc = swim3_add_device(mdev, floppy_count);
1118 if (rc)
1119 return rc;
1120
1121 /* Now create the queue if not there yet */
1122 if (swim3_queue == NULL) {
1123 /* If we failed, there isn't much we can do as the driver is still
1124 * too dumb to remove the device, just bail out
1125 */
1126 if (register_blkdev(FLOPPY_MAJOR, "fd"))
1127 return 0;
1128 swim3_queue = blk_init_queue(do_fd_request, &swim3_lock);
1129 if (swim3_queue == NULL) {
1130 unregister_blkdev(FLOPPY_MAJOR, "fd");
1131 return 0;
1132 }
1133 }
1134
1135 /* Now register that disk. Same comment about failure handling */
1136 i = floppy_count++;
1137 disk = disks[i] = alloc_disk(1);
1138 if (disk == NULL)
1139 return 0;
1140
1141 disk->major = FLOPPY_MAJOR;
1142 disk->first_minor = i;
1143 disk->fops = &floppy_fops;
1144 disk->private_data = &floppy_states[i];
1145 disk->queue = swim3_queue;
1146 disk->flags |= GENHD_FL_REMOVABLE;
1147 sprintf(disk->disk_name, "fd%d", i);
1148 set_capacity(disk, 2880);
1149 add_disk(disk);
1150
1151 return 0;
1152 }
1153
1154 static struct of_device_id swim3_match[] =
1155 {
1156 {
1157 .name = "swim3",
1158 },
1159 {
1160 .compatible = "ohare-swim3"
1161 },
1162 {
1163 .compatible = "swim3"
1164 },
1165 };
1166
1167 static struct macio_driver swim3_driver =
1168 {
1169 .name = "swim3",
1170 .match_table = swim3_match,
1171 .probe = swim3_attach,
1172 #if 0
1173 .suspend = swim3_suspend,
1174 .resume = swim3_resume,
1175 #endif
1176 };
1177
1178
1179 int swim3_init(void)
1180 {
1181 macio_register_driver(&swim3_driver);
1182 return 0;
1183 }
1184
1185 module_init(swim3_init)
1186
1187 MODULE_LICENSE("GPL");
1188 MODULE_AUTHOR("Paul Mackerras");
1189 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree