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block: convert to pos and nr_sectors accessors
[deliverable/linux.git] / drivers / block / swim3.c
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=%u buf=%p\n",
316 req->rq_disk->disk_name, req->cmd,
317 (long)blk_rq_pos(req), blk_rq_sectors(req), req->buffer);
318 printk(" errors=%d current_nr_sectors=%u\n",
319 req->errors, blk_rq_cur_sectors(req));
320 #endif
321
322 if (blk_rq_pos(req) >= fs->total_secs) {
323 __blk_end_request_cur(req, -EIO);
324 continue;
325 }
326 if (fs->ejected) {
327 __blk_end_request_cur(req, -EIO);
328 continue;
329 }
330
331 if (rq_data_dir(req) == WRITE) {
332 if (fs->write_prot < 0)
333 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
334 if (fs->write_prot) {
335 __blk_end_request_cur(req, -EIO);
336 continue;
337 }
338 }
339
340 /* Do not remove the cast. blk_rq_pos(req) is now a
341 * sector_t and can be 64 bits, but it will never go
342 * past 32 bits for this driver anyway, so we can
343 * safely cast it down and not have to do a 64/32
344 * division
345 */
346 fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl;
347 x = ((long)blk_rq_pos(req)) % fs->secpercyl;
348 fs->head = x / fs->secpertrack;
349 fs->req_sector = x % fs->secpertrack + 1;
350 fd_req = req;
351 fs->state = do_transfer;
352 fs->retries = 0;
353
354 act(fs);
355 }
356 }
357
358 static void set_timeout(struct floppy_state *fs, int nticks,
359 void (*proc)(unsigned long))
360 {
361 unsigned long flags;
362
363 spin_lock_irqsave(&fs->lock, flags);
364 if (fs->timeout_pending)
365 del_timer(&fs->timeout);
366 fs->timeout.expires = jiffies + nticks;
367 fs->timeout.function = proc;
368 fs->timeout.data = (unsigned long) fs;
369 add_timer(&fs->timeout);
370 fs->timeout_pending = 1;
371 spin_unlock_irqrestore(&fs->lock, flags);
372 }
373
374 static inline void scan_track(struct floppy_state *fs)
375 {
376 struct swim3 __iomem *sw = fs->swim3;
377
378 swim3_select(fs, READ_DATA_0);
379 in_8(&sw->intr); /* clear SEEN_SECTOR bit */
380 in_8(&sw->error);
381 out_8(&sw->intr_enable, SEEN_SECTOR);
382 out_8(&sw->control_bis, DO_ACTION);
383 /* enable intr when track found */
384 set_timeout(fs, HZ, scan_timeout); /* enable timeout */
385 }
386
387 static inline void seek_track(struct floppy_state *fs, int n)
388 {
389 struct swim3 __iomem *sw = fs->swim3;
390
391 if (n >= 0) {
392 swim3_action(fs, SEEK_POSITIVE);
393 sw->nseek = n;
394 } else {
395 swim3_action(fs, SEEK_NEGATIVE);
396 sw->nseek = -n;
397 }
398 fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
399 swim3_select(fs, STEP);
400 in_8(&sw->error);
401 /* enable intr when seek finished */
402 out_8(&sw->intr_enable, SEEK_DONE);
403 out_8(&sw->control_bis, DO_SEEK);
404 set_timeout(fs, 3*HZ, seek_timeout); /* enable timeout */
405 fs->settle_time = 0;
406 }
407
408 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
409 void *buf, int count)
410 {
411 st_le16(&cp->req_count, count);
412 st_le16(&cp->command, cmd);
413 st_le32(&cp->phy_addr, virt_to_bus(buf));
414 cp->xfer_status = 0;
415 }
416
417 static inline void setup_transfer(struct floppy_state *fs)
418 {
419 int n;
420 struct swim3 __iomem *sw = fs->swim3;
421 struct dbdma_cmd *cp = fs->dma_cmd;
422 struct dbdma_regs __iomem *dr = fs->dma;
423
424 if (blk_rq_cur_sectors(fd_req) <= 0) {
425 printk(KERN_ERR "swim3: transfer 0 sectors?\n");
426 return;
427 }
428 if (rq_data_dir(fd_req) == WRITE)
429 n = 1;
430 else {
431 n = fs->secpertrack - fs->req_sector + 1;
432 if (n > blk_rq_cur_sectors(fd_req))
433 n = blk_rq_cur_sectors(fd_req);
434 }
435 fs->scount = n;
436 swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
437 out_8(&sw->sector, fs->req_sector);
438 out_8(&sw->nsect, n);
439 out_8(&sw->gap3, 0);
440 out_le32(&dr->cmdptr, virt_to_bus(cp));
441 if (rq_data_dir(fd_req) == WRITE) {
442 /* Set up 3 dma commands: write preamble, data, postamble */
443 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
444 ++cp;
445 init_dma(cp, OUTPUT_MORE, fd_req->buffer, 512);
446 ++cp;
447 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
448 } else {
449 init_dma(cp, INPUT_LAST, fd_req->buffer, n * 512);
450 }
451 ++cp;
452 out_le16(&cp->command, DBDMA_STOP);
453 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
454 in_8(&sw->error);
455 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
456 if (rq_data_dir(fd_req) == WRITE)
457 out_8(&sw->control_bis, WRITE_SECTORS);
458 in_8(&sw->intr);
459 out_le32(&dr->control, (RUN << 16) | RUN);
460 /* enable intr when transfer complete */
461 out_8(&sw->intr_enable, TRANSFER_DONE);
462 out_8(&sw->control_bis, DO_ACTION);
463 set_timeout(fs, 2*HZ, xfer_timeout); /* enable timeout */
464 }
465
466 static void act(struct floppy_state *fs)
467 {
468 for (;;) {
469 switch (fs->state) {
470 case idle:
471 return; /* XXX shouldn't get here */
472
473 case locating:
474 if (swim3_readbit(fs, TRACK_ZERO)) {
475 fs->cur_cyl = 0;
476 if (fs->req_cyl == 0)
477 fs->state = do_transfer;
478 else
479 fs->state = seeking;
480 break;
481 }
482 scan_track(fs);
483 return;
484
485 case seeking:
486 if (fs->cur_cyl < 0) {
487 fs->expect_cyl = -1;
488 fs->state = locating;
489 break;
490 }
491 if (fs->req_cyl == fs->cur_cyl) {
492 printk("whoops, seeking 0\n");
493 fs->state = do_transfer;
494 break;
495 }
496 seek_track(fs, fs->req_cyl - fs->cur_cyl);
497 return;
498
499 case settling:
500 /* check for SEEK_COMPLETE after 30ms */
501 fs->settle_time = (HZ + 32) / 33;
502 set_timeout(fs, fs->settle_time, settle_timeout);
503 return;
504
505 case do_transfer:
506 if (fs->cur_cyl != fs->req_cyl) {
507 if (fs->retries > 5) {
508 __blk_end_request_cur(fd_req, -EIO);
509 fs->state = idle;
510 return;
511 }
512 fs->state = seeking;
513 break;
514 }
515 setup_transfer(fs);
516 return;
517
518 case jogging:
519 seek_track(fs, -5);
520 return;
521
522 default:
523 printk(KERN_ERR"swim3: unknown state %d\n", fs->state);
524 return;
525 }
526 }
527 }
528
529 static void scan_timeout(unsigned long data)
530 {
531 struct floppy_state *fs = (struct floppy_state *) data;
532 struct swim3 __iomem *sw = fs->swim3;
533
534 fs->timeout_pending = 0;
535 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
536 out_8(&sw->select, RELAX);
537 out_8(&sw->intr_enable, 0);
538 fs->cur_cyl = -1;
539 if (fs->retries > 5) {
540 __blk_end_request_cur(fd_req, -EIO);
541 fs->state = idle;
542 start_request(fs);
543 } else {
544 fs->state = jogging;
545 act(fs);
546 }
547 }
548
549 static void seek_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_SEEK);
556 out_8(&sw->select, RELAX);
557 out_8(&sw->intr_enable, 0);
558 printk(KERN_ERR "swim3: seek timeout\n");
559 __blk_end_request_cur(fd_req, -EIO);
560 fs->state = idle;
561 start_request(fs);
562 }
563
564 static void settle_timeout(unsigned long data)
565 {
566 struct floppy_state *fs = (struct floppy_state *) data;
567 struct swim3 __iomem *sw = fs->swim3;
568
569 fs->timeout_pending = 0;
570 if (swim3_readbit(fs, SEEK_COMPLETE)) {
571 out_8(&sw->select, RELAX);
572 fs->state = locating;
573 act(fs);
574 return;
575 }
576 out_8(&sw->select, RELAX);
577 if (fs->settle_time < 2*HZ) {
578 ++fs->settle_time;
579 set_timeout(fs, 1, settle_timeout);
580 return;
581 }
582 printk(KERN_ERR "swim3: seek settle timeout\n");
583 __blk_end_request_cur(fd_req, -EIO);
584 fs->state = idle;
585 start_request(fs);
586 }
587
588 static void xfer_timeout(unsigned long data)
589 {
590 struct floppy_state *fs = (struct floppy_state *) data;
591 struct swim3 __iomem *sw = fs->swim3;
592 struct dbdma_regs __iomem *dr = fs->dma;
593 int n;
594
595 fs->timeout_pending = 0;
596 out_le32(&dr->control, RUN << 16);
597 /* We must wait a bit for dbdma to stop */
598 for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
599 udelay(1);
600 out_8(&sw->intr_enable, 0);
601 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
602 out_8(&sw->select, RELAX);
603 printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
604 (rq_data_dir(fd_req)==WRITE? "writ": "read"),
605 (long)blk_rq_pos(fd_req));
606 __blk_end_request_cur(fd_req, -EIO);
607 fs->state = idle;
608 start_request(fs);
609 }
610
611 static irqreturn_t swim3_interrupt(int irq, void *dev_id)
612 {
613 struct floppy_state *fs = (struct floppy_state *) dev_id;
614 struct swim3 __iomem *sw = fs->swim3;
615 int intr, err, n;
616 int stat, resid;
617 struct dbdma_regs __iomem *dr;
618 struct dbdma_cmd *cp;
619
620 intr = in_8(&sw->intr);
621 err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
622 if ((intr & ERROR_INTR) && fs->state != do_transfer)
623 printk(KERN_ERR "swim3_interrupt, state=%d, dir=%x, intr=%x, err=%x\n",
624 fs->state, rq_data_dir(fd_req), intr, err);
625 switch (fs->state) {
626 case locating:
627 if (intr & SEEN_SECTOR) {
628 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
629 out_8(&sw->select, RELAX);
630 out_8(&sw->intr_enable, 0);
631 del_timer(&fs->timeout);
632 fs->timeout_pending = 0;
633 if (sw->ctrack == 0xff) {
634 printk(KERN_ERR "swim3: seen sector but cyl=ff?\n");
635 fs->cur_cyl = -1;
636 if (fs->retries > 5) {
637 __blk_end_request_cur(fd_req, -EIO);
638 fs->state = idle;
639 start_request(fs);
640 } else {
641 fs->state = jogging;
642 act(fs);
643 }
644 break;
645 }
646 fs->cur_cyl = sw->ctrack;
647 fs->cur_sector = sw->csect;
648 if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
649 printk(KERN_ERR "swim3: expected cyl %d, got %d\n",
650 fs->expect_cyl, fs->cur_cyl);
651 fs->state = do_transfer;
652 act(fs);
653 }
654 break;
655 case seeking:
656 case jogging:
657 if (sw->nseek == 0) {
658 out_8(&sw->control_bic, DO_SEEK);
659 out_8(&sw->select, RELAX);
660 out_8(&sw->intr_enable, 0);
661 del_timer(&fs->timeout);
662 fs->timeout_pending = 0;
663 if (fs->state == seeking)
664 ++fs->retries;
665 fs->state = settling;
666 act(fs);
667 }
668 break;
669 case settling:
670 out_8(&sw->intr_enable, 0);
671 del_timer(&fs->timeout);
672 fs->timeout_pending = 0;
673 act(fs);
674 break;
675 case do_transfer:
676 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
677 break;
678 out_8(&sw->intr_enable, 0);
679 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
680 out_8(&sw->select, RELAX);
681 del_timer(&fs->timeout);
682 fs->timeout_pending = 0;
683 dr = fs->dma;
684 cp = fs->dma_cmd;
685 if (rq_data_dir(fd_req) == WRITE)
686 ++cp;
687 /*
688 * Check that the main data transfer has finished.
689 * On writing, the swim3 sometimes doesn't use
690 * up all the bytes of the postamble, so we can still
691 * see DMA active here. That doesn't matter as long
692 * as all the sector data has been transferred.
693 */
694 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
695 /* wait a little while for DMA to complete */
696 for (n = 0; n < 100; ++n) {
697 if (cp->xfer_status != 0)
698 break;
699 udelay(1);
700 barrier();
701 }
702 }
703 /* turn off DMA */
704 out_le32(&dr->control, (RUN | PAUSE) << 16);
705 stat = ld_le16(&cp->xfer_status);
706 resid = ld_le16(&cp->res_count);
707 if (intr & ERROR_INTR) {
708 n = fs->scount - 1 - resid / 512;
709 if (n > 0) {
710 blk_update_request(fd_req, 0, n << 9);
711 fs->req_sector += n;
712 }
713 if (fs->retries < 5) {
714 ++fs->retries;
715 act(fs);
716 } else {
717 printk("swim3: error %sing block %ld (err=%x)\n",
718 rq_data_dir(fd_req) == WRITE? "writ": "read",
719 (long)blk_rq_pos(fd_req), err);
720 __blk_end_request_cur(fd_req, -EIO);
721 fs->state = idle;
722 }
723 } else {
724 if ((stat & ACTIVE) == 0 || resid != 0) {
725 /* musta been an error */
726 printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid);
727 printk(KERN_ERR " state=%d, dir=%x, intr=%x, err=%x\n",
728 fs->state, rq_data_dir(fd_req), intr, err);
729 __blk_end_request_cur(fd_req, -EIO);
730 fs->state = idle;
731 start_request(fs);
732 break;
733 }
734 if (__blk_end_request(fd_req, 0, fs->scount << 9)) {
735 fs->req_sector += fs->scount;
736 if (fs->req_sector > fs->secpertrack) {
737 fs->req_sector -= fs->secpertrack;
738 if (++fs->head > 1) {
739 fs->head = 0;
740 ++fs->req_cyl;
741 }
742 }
743 act(fs);
744 } else
745 fs->state = idle;
746 }
747 if (fs->state == idle)
748 start_request(fs);
749 break;
750 default:
751 printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state);
752 }
753 return IRQ_HANDLED;
754 }
755
756 /*
757 static void fd_dma_interrupt(int irq, void *dev_id)
758 {
759 }
760 */
761
762 static int grab_drive(struct floppy_state *fs, enum swim_state state,
763 int interruptible)
764 {
765 unsigned long flags;
766
767 spin_lock_irqsave(&fs->lock, flags);
768 if (fs->state != idle) {
769 ++fs->wanted;
770 while (fs->state != available) {
771 if (interruptible && signal_pending(current)) {
772 --fs->wanted;
773 spin_unlock_irqrestore(&fs->lock, flags);
774 return -EINTR;
775 }
776 interruptible_sleep_on(&fs->wait);
777 }
778 --fs->wanted;
779 }
780 fs->state = state;
781 spin_unlock_irqrestore(&fs->lock, flags);
782 return 0;
783 }
784
785 static void release_drive(struct floppy_state *fs)
786 {
787 unsigned long flags;
788
789 spin_lock_irqsave(&fs->lock, flags);
790 fs->state = idle;
791 start_request(fs);
792 spin_unlock_irqrestore(&fs->lock, flags);
793 }
794
795 static int fd_eject(struct floppy_state *fs)
796 {
797 int err, n;
798
799 err = grab_drive(fs, ejecting, 1);
800 if (err)
801 return err;
802 swim3_action(fs, EJECT);
803 for (n = 20; n > 0; --n) {
804 if (signal_pending(current)) {
805 err = -EINTR;
806 break;
807 }
808 swim3_select(fs, RELAX);
809 schedule_timeout_interruptible(1);
810 if (swim3_readbit(fs, DISK_IN) == 0)
811 break;
812 }
813 swim3_select(fs, RELAX);
814 udelay(150);
815 fs->ejected = 1;
816 release_drive(fs);
817 return err;
818 }
819
820 static struct floppy_struct floppy_type =
821 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL }; /* 7 1.44MB 3.5" */
822
823 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
824 unsigned int cmd, unsigned long param)
825 {
826 struct floppy_state *fs = bdev->bd_disk->private_data;
827 int err;
828
829 if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
830 return -EPERM;
831
832 #ifdef CONFIG_PMAC_MEDIABAY
833 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
834 return -ENXIO;
835 #endif
836
837 switch (cmd) {
838 case FDEJECT:
839 if (fs->ref_count != 1)
840 return -EBUSY;
841 err = fd_eject(fs);
842 return err;
843 case FDGETPRM:
844 if (copy_to_user((void __user *) param, &floppy_type,
845 sizeof(struct floppy_struct)))
846 return -EFAULT;
847 return 0;
848 }
849 return -ENOTTY;
850 }
851
852 static int floppy_open(struct block_device *bdev, fmode_t mode)
853 {
854 struct floppy_state *fs = bdev->bd_disk->private_data;
855 struct swim3 __iomem *sw = fs->swim3;
856 int n, err = 0;
857
858 if (fs->ref_count == 0) {
859 #ifdef CONFIG_PMAC_MEDIABAY
860 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
861 return -ENXIO;
862 #endif
863 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
864 out_8(&sw->control_bic, 0xff);
865 out_8(&sw->mode, 0x95);
866 udelay(10);
867 out_8(&sw->intr_enable, 0);
868 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
869 swim3_action(fs, MOTOR_ON);
870 fs->write_prot = -1;
871 fs->cur_cyl = -1;
872 for (n = 0; n < 2 * HZ; ++n) {
873 if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
874 break;
875 if (signal_pending(current)) {
876 err = -EINTR;
877 break;
878 }
879 swim3_select(fs, RELAX);
880 schedule_timeout_interruptible(1);
881 }
882 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
883 || swim3_readbit(fs, DISK_IN) == 0))
884 err = -ENXIO;
885 swim3_action(fs, SETMFM);
886 swim3_select(fs, RELAX);
887
888 } else if (fs->ref_count == -1 || mode & FMODE_EXCL)
889 return -EBUSY;
890
891 if (err == 0 && (mode & FMODE_NDELAY) == 0
892 && (mode & (FMODE_READ|FMODE_WRITE))) {
893 check_disk_change(bdev);
894 if (fs->ejected)
895 err = -ENXIO;
896 }
897
898 if (err == 0 && (mode & FMODE_WRITE)) {
899 if (fs->write_prot < 0)
900 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
901 if (fs->write_prot)
902 err = -EROFS;
903 }
904
905 if (err) {
906 if (fs->ref_count == 0) {
907 swim3_action(fs, MOTOR_OFF);
908 out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
909 swim3_select(fs, RELAX);
910 }
911 return err;
912 }
913
914 if (mode & FMODE_EXCL)
915 fs->ref_count = -1;
916 else
917 ++fs->ref_count;
918
919 return 0;
920 }
921
922 static int floppy_release(struct gendisk *disk, fmode_t mode)
923 {
924 struct floppy_state *fs = disk->private_data;
925 struct swim3 __iomem *sw = fs->swim3;
926 if (fs->ref_count > 0 && --fs->ref_count == 0) {
927 swim3_action(fs, MOTOR_OFF);
928 out_8(&sw->control_bic, 0xff);
929 swim3_select(fs, RELAX);
930 }
931 return 0;
932 }
933
934 static int floppy_check_change(struct gendisk *disk)
935 {
936 struct floppy_state *fs = disk->private_data;
937 return fs->ejected;
938 }
939
940 static int floppy_revalidate(struct gendisk *disk)
941 {
942 struct floppy_state *fs = disk->private_data;
943 struct swim3 __iomem *sw;
944 int ret, n;
945
946 #ifdef CONFIG_PMAC_MEDIABAY
947 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
948 return -ENXIO;
949 #endif
950
951 sw = fs->swim3;
952 grab_drive(fs, revalidating, 0);
953 out_8(&sw->intr_enable, 0);
954 out_8(&sw->control_bis, DRIVE_ENABLE);
955 swim3_action(fs, MOTOR_ON); /* necessary? */
956 fs->write_prot = -1;
957 fs->cur_cyl = -1;
958 mdelay(1);
959 for (n = HZ; n > 0; --n) {
960 if (swim3_readbit(fs, SEEK_COMPLETE))
961 break;
962 if (signal_pending(current))
963 break;
964 swim3_select(fs, RELAX);
965 schedule_timeout_interruptible(1);
966 }
967 ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
968 || swim3_readbit(fs, DISK_IN) == 0;
969 if (ret)
970 swim3_action(fs, MOTOR_OFF);
971 else {
972 fs->ejected = 0;
973 swim3_action(fs, SETMFM);
974 }
975 swim3_select(fs, RELAX);
976
977 release_drive(fs);
978 return ret;
979 }
980
981 static struct block_device_operations floppy_fops = {
982 .open = floppy_open,
983 .release = floppy_release,
984 .locked_ioctl = floppy_ioctl,
985 .media_changed = floppy_check_change,
986 .revalidate_disk= floppy_revalidate,
987 };
988
989 static int swim3_add_device(struct macio_dev *mdev, int index)
990 {
991 struct device_node *swim = mdev->ofdev.node;
992 struct device_node *mediabay;
993 struct floppy_state *fs = &floppy_states[index];
994 int rc = -EBUSY;
995
996 /* Check & Request resources */
997 if (macio_resource_count(mdev) < 2) {
998 printk(KERN_WARNING "ifd%d: no address for %s\n",
999 index, swim->full_name);
1000 return -ENXIO;
1001 }
1002 if (macio_irq_count(mdev) < 2) {
1003 printk(KERN_WARNING "fd%d: no intrs for device %s\n",
1004 index, swim->full_name);
1005 }
1006 if (macio_request_resource(mdev, 0, "swim3 (mmio)")) {
1007 printk(KERN_ERR "fd%d: can't request mmio resource for %s\n",
1008 index, swim->full_name);
1009 return -EBUSY;
1010 }
1011 if (macio_request_resource(mdev, 1, "swim3 (dma)")) {
1012 printk(KERN_ERR "fd%d: can't request dma resource for %s\n",
1013 index, swim->full_name);
1014 macio_release_resource(mdev, 0);
1015 return -EBUSY;
1016 }
1017 dev_set_drvdata(&mdev->ofdev.dev, fs);
1018
1019 mediabay = (strcasecmp(swim->parent->type, "media-bay") == 0) ?
1020 swim->parent : NULL;
1021 if (mediabay == NULL)
1022 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1023
1024 memset(fs, 0, sizeof(*fs));
1025 spin_lock_init(&fs->lock);
1026 fs->state = idle;
1027 fs->swim3 = (struct swim3 __iomem *)
1028 ioremap(macio_resource_start(mdev, 0), 0x200);
1029 if (fs->swim3 == NULL) {
1030 printk("fd%d: couldn't map registers for %s\n",
1031 index, swim->full_name);
1032 rc = -ENOMEM;
1033 goto out_release;
1034 }
1035 fs->dma = (struct dbdma_regs __iomem *)
1036 ioremap(macio_resource_start(mdev, 1), 0x200);
1037 if (fs->dma == NULL) {
1038 printk("fd%d: couldn't map DMA for %s\n",
1039 index, swim->full_name);
1040 iounmap(fs->swim3);
1041 rc = -ENOMEM;
1042 goto out_release;
1043 }
1044 fs->swim3_intr = macio_irq(mdev, 0);
1045 fs->dma_intr = macio_irq(mdev, 1);;
1046 fs->cur_cyl = -1;
1047 fs->cur_sector = -1;
1048 fs->secpercyl = 36;
1049 fs->secpertrack = 18;
1050 fs->total_secs = 2880;
1051 fs->media_bay = mediabay;
1052 init_waitqueue_head(&fs->wait);
1053
1054 fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1055 memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1056 st_le16(&fs->dma_cmd[1].command, DBDMA_STOP);
1057
1058 if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1059 printk(KERN_ERR "fd%d: couldn't request irq %d for %s\n",
1060 index, fs->swim3_intr, swim->full_name);
1061 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1062 goto out_unmap;
1063 return -EBUSY;
1064 }
1065 /*
1066 if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) {
1067 printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA",
1068 fs->dma_intr);
1069 return -EBUSY;
1070 }
1071 */
1072
1073 init_timer(&fs->timeout);
1074
1075 printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count,
1076 mediabay ? "in media bay" : "");
1077
1078 return 0;
1079
1080 out_unmap:
1081 iounmap(fs->dma);
1082 iounmap(fs->swim3);
1083
1084 out_release:
1085 macio_release_resource(mdev, 0);
1086 macio_release_resource(mdev, 1);
1087
1088 return rc;
1089 }
1090
1091 static int __devinit swim3_attach(struct macio_dev *mdev, const struct of_device_id *match)
1092 {
1093 int i, rc;
1094 struct gendisk *disk;
1095
1096 /* Add the drive */
1097 rc = swim3_add_device(mdev, floppy_count);
1098 if (rc)
1099 return rc;
1100
1101 /* Now create the queue if not there yet */
1102 if (swim3_queue == NULL) {
1103 /* If we failed, there isn't much we can do as the driver is still
1104 * too dumb to remove the device, just bail out
1105 */
1106 if (register_blkdev(FLOPPY_MAJOR, "fd"))
1107 return 0;
1108 swim3_queue = blk_init_queue(do_fd_request, &swim3_lock);
1109 if (swim3_queue == NULL) {
1110 unregister_blkdev(FLOPPY_MAJOR, "fd");
1111 return 0;
1112 }
1113 }
1114
1115 /* Now register that disk. Same comment about failure handling */
1116 i = floppy_count++;
1117 disk = disks[i] = alloc_disk(1);
1118 if (disk == NULL)
1119 return 0;
1120
1121 disk->major = FLOPPY_MAJOR;
1122 disk->first_minor = i;
1123 disk->fops = &floppy_fops;
1124 disk->private_data = &floppy_states[i];
1125 disk->queue = swim3_queue;
1126 disk->flags |= GENHD_FL_REMOVABLE;
1127 sprintf(disk->disk_name, "fd%d", i);
1128 set_capacity(disk, 2880);
1129 add_disk(disk);
1130
1131 return 0;
1132 }
1133
1134 static struct of_device_id swim3_match[] =
1135 {
1136 {
1137 .name = "swim3",
1138 },
1139 {
1140 .compatible = "ohare-swim3"
1141 },
1142 {
1143 .compatible = "swim3"
1144 },
1145 };
1146
1147 static struct macio_driver swim3_driver =
1148 {
1149 .name = "swim3",
1150 .match_table = swim3_match,
1151 .probe = swim3_attach,
1152 #if 0
1153 .suspend = swim3_suspend,
1154 .resume = swim3_resume,
1155 #endif
1156 };
1157
1158
1159 int swim3_init(void)
1160 {
1161 macio_register_driver(&swim3_driver);
1162 return 0;
1163 }
1164
1165 module_init(swim3_init)
1166
1167 MODULE_LICENSE("GPL");
1168 MODULE_AUTHOR("Paul Mackerras");
1169 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);
Linux kernel - Deliverables
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