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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6
[linux-2.6/cjktty.git] / drivers / block / swim3.c
blobbf3a5b8592990ccf640b4221973ff84114b893df
1 /*
2 * Driver for the SWIM3 (Super Woz Integrated Machine 3)
3 * floppy controller found on Power Macintoshes.
4 *
5 * Copyright (C) 1996 Paul Mackerras.
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13 /*
14 * TODO:
15 * handle 2 drives
16 * handle GCR disks
17 */
18
19 #include <linux/stddef.h>
20 #include <linux/kernel.h>
21 #include <linux/sched.h>
22 #include <linux/timer.h>
23 #include <linux/delay.h>
24 #include <linux/fd.h>
25 #include <linux/ioctl.h>
26 #include <linux/blkdev.h>
27 #include <linux/interrupt.h>
28 #include <linux/mutex.h>
29 #include <linux/module.h>
30 #include <linux/spinlock.h>
31 #include <asm/io.h>
32 #include <asm/dbdma.h>
33 #include <asm/prom.h>
34 #include <asm/uaccess.h>
35 #include <asm/mediabay.h>
36 #include <asm/machdep.h>
37 #include <asm/pmac_feature.h>
38
39 static DEFINE_MUTEX(swim3_mutex);
40 static struct request_queue *swim3_queue;
41 static struct gendisk *disks[2];
42 static struct request *fd_req;
43
44 #define MAX_FLOPPIES 2
45
46 enum swim_state {
47 idle,
48 locating,
49 seeking,
50 settling,
51 do_transfer,
52 jogging,
53 available,
54 revalidating,
55 ejecting
56 };
57
58 #define REG(x) unsigned char x; char x ## _pad[15];
59
60 /*
61 * The names for these registers mostly represent speculation on my part.
62 * It will be interesting to see how close they are to the names Apple uses.
63 */
64 struct swim3 {
65 REG(data);
66 REG(timer); /* counts down at 1MHz */
67 REG(error);
68 REG(mode);
69 REG(select); /* controls CA0, CA1, CA2 and LSTRB signals */
70 REG(setup);
71 REG(control); /* writing bits clears them */
72 REG(status); /* writing bits sets them in control */
73 REG(intr);
74 REG(nseek); /* # tracks to seek */
75 REG(ctrack); /* current track number */
76 REG(csect); /* current sector number */
77 REG(gap3); /* size of gap 3 in track format */
78 REG(sector); /* sector # to read or write */
79 REG(nsect); /* # sectors to read or write */
80 REG(intr_enable);
81 };
82
83 #define control_bic control
84 #define control_bis status
85
86 /* Bits in select register */
87 #define CA_MASK 7
88 #define LSTRB 8
89
90 /* Bits in control register */
91 #define DO_SEEK 0x80
92 #define FORMAT 0x40
93 #define SELECT 0x20
94 #define WRITE_SECTORS 0x10
95 #define DO_ACTION 0x08
96 #define DRIVE2_ENABLE 0x04
97 #define DRIVE_ENABLE 0x02
98 #define INTR_ENABLE 0x01
99
100 /* Bits in status register */
101 #define FIFO_1BYTE 0x80
102 #define FIFO_2BYTE 0x40
103 #define ERROR 0x20
104 #define DATA 0x08
105 #define RDDATA 0x04
106 #define INTR_PENDING 0x02
107 #define MARK_BYTE 0x01
108
109 /* Bits in intr and intr_enable registers */
110 #define ERROR_INTR 0x20
111 #define DATA_CHANGED 0x10
112 #define TRANSFER_DONE 0x08
113 #define SEEN_SECTOR 0x04
114 #define SEEK_DONE 0x02
115 #define TIMER_DONE 0x01
116
117 /* Bits in error register */
118 #define ERR_DATA_CRC 0x80
119 #define ERR_ADDR_CRC 0x40
120 #define ERR_OVERRUN 0x04
121 #define ERR_UNDERRUN 0x01
122
123 /* Bits in setup register */
124 #define S_SW_RESET 0x80
125 #define S_GCR_WRITE 0x40
126 #define S_IBM_DRIVE 0x20
127 #define S_TEST_MODE 0x10
128 #define S_FCLK_DIV2 0x08
129 #define S_GCR 0x04
130 #define S_COPY_PROT 0x02
131 #define S_INV_WDATA 0x01
132
133 /* Select values for swim3_action */
134 #define SEEK_POSITIVE 0
135 #define SEEK_NEGATIVE 4
136 #define STEP 1
137 #define MOTOR_ON 2
138 #define MOTOR_OFF 6
139 #define INDEX 3
140 #define EJECT 7
141 #define SETMFM 9
142 #define SETGCR 13
143
144 /* Select values for swim3_select and swim3_readbit */
145 #define STEP_DIR 0
146 #define STEPPING 1
147 #define MOTOR_ON 2
148 #define RELAX 3 /* also eject in progress */
149 #define READ_DATA_0 4
150 #define TWOMEG_DRIVE 5
151 #define SINGLE_SIDED 6 /* drive or diskette is 4MB type? */
152 #define DRIVE_PRESENT 7
153 #define DISK_IN 8
154 #define WRITE_PROT 9
155 #define TRACK_ZERO 10
156 #define TACHO 11
157 #define READ_DATA_1 12
158 #define MFM_MODE 13
159 #define SEEK_COMPLETE 14
160 #define ONEMEG_MEDIA 15
161
162 /* Definitions of values used in writing and formatting */
163 #define DATA_ESCAPE 0x99
164 #define GCR_SYNC_EXC 0x3f
165 #define GCR_SYNC_CONV 0x80
166 #define GCR_FIRST_MARK 0xd5
167 #define GCR_SECOND_MARK 0xaa
168 #define GCR_ADDR_MARK "\xd5\xaa\x00"
169 #define GCR_DATA_MARK "\xd5\xaa\x0b"
170 #define GCR_SLIP_BYTE "\x27\xaa"
171 #define GCR_SELF_SYNC "\x3f\xbf\x1e\x34\x3c\x3f"
172
173 #define DATA_99 "\x99\x99"
174 #define MFM_ADDR_MARK "\x99\xa1\x99\xa1\x99\xa1\x99\xfe"
175 #define MFM_INDEX_MARK "\x99\xc2\x99\xc2\x99\xc2\x99\xfc"
176 #define MFM_GAP_LEN 12
177
178 struct floppy_state {
179 enum swim_state state;
180 spinlock_t lock;
181 struct swim3 __iomem *swim3; /* hardware registers */
182 struct dbdma_regs __iomem *dma; /* DMA controller registers */
183 int swim3_intr; /* interrupt number for SWIM3 */
184 int dma_intr; /* interrupt number for DMA channel */
185 int cur_cyl; /* cylinder head is on, or -1 */
186 int cur_sector; /* last sector we saw go past */
187 int req_cyl; /* the cylinder for the current r/w request */
188 int head; /* head number ditto */
189 int req_sector; /* sector number ditto */
190 int scount; /* # sectors we're transferring at present */
191 int retries;
192 int settle_time;
193 int secpercyl; /* disk geometry information */
194 int secpertrack;
195 int total_secs;
196 int write_prot; /* 1 if write-protected, 0 if not, -1 dunno */
197 struct dbdma_cmd *dma_cmd;
198 int ref_count;
199 int expect_cyl;
200 struct timer_list timeout;
201 int timeout_pending;
202 int ejected;
203 wait_queue_head_t wait;
204 int wanted;
205 struct macio_dev *mdev;
206 char dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)];
207 };
208
209 static struct floppy_state floppy_states[MAX_FLOPPIES];
210 static int floppy_count = 0;
211 static DEFINE_SPINLOCK(swim3_lock);
212
213 static unsigned short write_preamble[] = {
214 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */
215 0, 0, 0, 0, 0, 0, /* sync field */
216 0x99a1, 0x99a1, 0x99a1, 0x99fb, /* data address mark */
217 0x990f /* no escape for 512 bytes */
218 };
219
220 static unsigned short write_postamble[] = {
221 0x9904, /* insert CRC */
222 0x4e4e, 0x4e4e,
223 0x9908, /* stop writing */
224 0, 0, 0, 0, 0, 0
225 };
226
227 static void swim3_select(struct floppy_state *fs, int sel);
228 static void swim3_action(struct floppy_state *fs, int action);
229 static int swim3_readbit(struct floppy_state *fs, int bit);
230 static void do_fd_request(struct request_queue * q);
231 static void start_request(struct floppy_state *fs);
232 static void set_timeout(struct floppy_state *fs, int nticks,
233 void (*proc)(unsigned long));
234 static void scan_track(struct floppy_state *fs);
235 static void seek_track(struct floppy_state *fs, int n);
236 static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count);
237 static void setup_transfer(struct floppy_state *fs);
238 static void act(struct floppy_state *fs);
239 static void scan_timeout(unsigned long data);
240 static void seek_timeout(unsigned long data);
241 static void settle_timeout(unsigned long data);
242 static void xfer_timeout(unsigned long data);
243 static irqreturn_t swim3_interrupt(int irq, void *dev_id);
244 /*static void fd_dma_interrupt(int irq, void *dev_id);*/
245 static int grab_drive(struct floppy_state *fs, enum swim_state state,
246 int interruptible);
247 static void release_drive(struct floppy_state *fs);
248 static int fd_eject(struct floppy_state *fs);
249 static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
250 unsigned int cmd, unsigned long param);
251 static int floppy_open(struct block_device *bdev, fmode_t mode);
252 static int floppy_release(struct gendisk *disk, fmode_t mode);
253 static int floppy_check_change(struct gendisk *disk);
254 static int floppy_revalidate(struct gendisk *disk);
255
256 static bool swim3_end_request(int err, unsigned int nr_bytes)
257 {
258 if (__blk_end_request(fd_req, err, nr_bytes))
259 return true;
260
261 fd_req = NULL;
262 return false;
263 }
264
265 static bool swim3_end_request_cur(int err)
266 {
267 return swim3_end_request(err, blk_rq_cur_bytes(fd_req));
268 }
269
270 static void swim3_select(struct floppy_state *fs, int sel)
271 {
272 struct swim3 __iomem *sw = fs->swim3;
273
274 out_8(&sw->select, RELAX);
275 if (sel & 8)
276 out_8(&sw->control_bis, SELECT);
277 else
278 out_8(&sw->control_bic, SELECT);
279 out_8(&sw->select, sel & CA_MASK);
280 }
281
282 static void swim3_action(struct floppy_state *fs, int action)
283 {
284 struct swim3 __iomem *sw = fs->swim3;
285
286 swim3_select(fs, action);
287 udelay(1);
288 out_8(&sw->select, sw->select | LSTRB);
289 udelay(2);
290 out_8(&sw->select, sw->select & ~LSTRB);
291 udelay(1);
292 }
293
294 static int swim3_readbit(struct floppy_state *fs, int bit)
295 {
296 struct swim3 __iomem *sw = fs->swim3;
297 int stat;
298
299 swim3_select(fs, bit);
300 udelay(1);
301 stat = in_8(&sw->status);
302 return (stat & DATA) == 0;
303 }
304
305 static void do_fd_request(struct request_queue * q)
306 {
307 int i;
308
309 for(i=0; i<floppy_count; i++) {
310 struct floppy_state *fs = &floppy_states[i];
311 if (fs->mdev->media_bay &&
312 check_media_bay(fs->mdev->media_bay) != MB_FD)
313 continue;
314 start_request(fs);
315 }
316 }
317
318 static void start_request(struct floppy_state *fs)
319 {
320 struct request *req;
321 unsigned long x;
322
323 if (fs->state == idle && fs->wanted) {
324 fs->state = available;
325 wake_up(&fs->wait);
326 return;
327 }
328 while (fs->state == idle) {
329 if (!fd_req) {
330 fd_req = blk_fetch_request(swim3_queue);
331 if (!fd_req)
332 break;
333 }
334 req = fd_req;
335 #if 0
336 printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%u buf=%p\n",
337 req->rq_disk->disk_name, req->cmd,
338 (long)blk_rq_pos(req), blk_rq_sectors(req), req->buffer);
339 printk(" errors=%d current_nr_sectors=%u\n",
340 req->errors, blk_rq_cur_sectors(req));
341 #endif
342
343 if (blk_rq_pos(req) >= fs->total_secs) {
344 swim3_end_request_cur(-EIO);
345 continue;
346 }
347 if (fs->ejected) {
348 swim3_end_request_cur(-EIO);
349 continue;
350 }
351
352 if (rq_data_dir(req) == WRITE) {
353 if (fs->write_prot < 0)
354 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
355 if (fs->write_prot) {
356 swim3_end_request_cur(-EIO);
357 continue;
358 }
359 }
360
361 /* Do not remove the cast. blk_rq_pos(req) is now a
362 * sector_t and can be 64 bits, but it will never go
363 * past 32 bits for this driver anyway, so we can
364 * safely cast it down and not have to do a 64/32
365 * division
366 */
367 fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl;
368 x = ((long)blk_rq_pos(req)) % fs->secpercyl;
369 fs->head = x / fs->secpertrack;
370 fs->req_sector = x % fs->secpertrack + 1;
371 fd_req = req;
372 fs->state = do_transfer;
373 fs->retries = 0;
374
375 act(fs);
376 }
377 }
378
379 static void set_timeout(struct floppy_state *fs, int nticks,
380 void (*proc)(unsigned long))
381 {
382 unsigned long flags;
383
384 spin_lock_irqsave(&fs->lock, flags);
385 if (fs->timeout_pending)
386 del_timer(&fs->timeout);
387 fs->timeout.expires = jiffies + nticks;
388 fs->timeout.function = proc;
389 fs->timeout.data = (unsigned long) fs;
390 add_timer(&fs->timeout);
391 fs->timeout_pending = 1;
392 spin_unlock_irqrestore(&fs->lock, flags);
393 }
394
395 static inline void scan_track(struct floppy_state *fs)
396 {
397 struct swim3 __iomem *sw = fs->swim3;
398
399 swim3_select(fs, READ_DATA_0);
400 in_8(&sw->intr); /* clear SEEN_SECTOR bit */
401 in_8(&sw->error);
402 out_8(&sw->intr_enable, SEEN_SECTOR);
403 out_8(&sw->control_bis, DO_ACTION);
404 /* enable intr when track found */
405 set_timeout(fs, HZ, scan_timeout); /* enable timeout */
406 }
407
408 static inline void seek_track(struct floppy_state *fs, int n)
409 {
410 struct swim3 __iomem *sw = fs->swim3;
411
412 if (n >= 0) {
413 swim3_action(fs, SEEK_POSITIVE);
414 sw->nseek = n;
415 } else {
416 swim3_action(fs, SEEK_NEGATIVE);
417 sw->nseek = -n;
418 }
419 fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
420 swim3_select(fs, STEP);
421 in_8(&sw->error);
422 /* enable intr when seek finished */
423 out_8(&sw->intr_enable, SEEK_DONE);
424 out_8(&sw->control_bis, DO_SEEK);
425 set_timeout(fs, 3*HZ, seek_timeout); /* enable timeout */
426 fs->settle_time = 0;
427 }
428
429 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
430 void *buf, int count)
431 {
432 st_le16(&cp->req_count, count);
433 st_le16(&cp->command, cmd);
434 st_le32(&cp->phy_addr, virt_to_bus(buf));
435 cp->xfer_status = 0;
436 }
437
438 static inline void setup_transfer(struct floppy_state *fs)
439 {
440 int n;
441 struct swim3 __iomem *sw = fs->swim3;
442 struct dbdma_cmd *cp = fs->dma_cmd;
443 struct dbdma_regs __iomem *dr = fs->dma;
444
445 if (blk_rq_cur_sectors(fd_req) <= 0) {
446 printk(KERN_ERR "swim3: transfer 0 sectors?\n");
447 return;
448 }
449 if (rq_data_dir(fd_req) == WRITE)
450 n = 1;
451 else {
452 n = fs->secpertrack - fs->req_sector + 1;
453 if (n > blk_rq_cur_sectors(fd_req))
454 n = blk_rq_cur_sectors(fd_req);
455 }
456 fs->scount = n;
457 swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
458 out_8(&sw->sector, fs->req_sector);
459 out_8(&sw->nsect, n);
460 out_8(&sw->gap3, 0);
461 out_le32(&dr->cmdptr, virt_to_bus(cp));
462 if (rq_data_dir(fd_req) == WRITE) {
463 /* Set up 3 dma commands: write preamble, data, postamble */
464 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
465 ++cp;
466 init_dma(cp, OUTPUT_MORE, fd_req->buffer, 512);
467 ++cp;
468 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
469 } else {
470 init_dma(cp, INPUT_LAST, fd_req->buffer, n * 512);
471 }
472 ++cp;
473 out_le16(&cp->command, DBDMA_STOP);
474 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
475 in_8(&sw->error);
476 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
477 if (rq_data_dir(fd_req) == WRITE)
478 out_8(&sw->control_bis, WRITE_SECTORS);
479 in_8(&sw->intr);
480 out_le32(&dr->control, (RUN << 16) | RUN);
481 /* enable intr when transfer complete */
482 out_8(&sw->intr_enable, TRANSFER_DONE);
483 out_8(&sw->control_bis, DO_ACTION);
484 set_timeout(fs, 2*HZ, xfer_timeout); /* enable timeout */
485 }
486
487 static void act(struct floppy_state *fs)
488 {
489 for (;;) {
490 switch (fs->state) {
491 case idle:
492 return; /* XXX shouldn't get here */
493
494 case locating:
495 if (swim3_readbit(fs, TRACK_ZERO)) {
496 fs->cur_cyl = 0;
497 if (fs->req_cyl == 0)
498 fs->state = do_transfer;
499 else
500 fs->state = seeking;
501 break;
502 }
503 scan_track(fs);
504 return;
505
506 case seeking:
507 if (fs->cur_cyl < 0) {
508 fs->expect_cyl = -1;
509 fs->state = locating;
510 break;
511 }
512 if (fs->req_cyl == fs->cur_cyl) {
513 printk("whoops, seeking 0\n");
514 fs->state = do_transfer;
515 break;
516 }
517 seek_track(fs, fs->req_cyl - fs->cur_cyl);
518 return;
519
520 case settling:
521 /* check for SEEK_COMPLETE after 30ms */
522 fs->settle_time = (HZ + 32) / 33;
523 set_timeout(fs, fs->settle_time, settle_timeout);
524 return;
525
526 case do_transfer:
527 if (fs->cur_cyl != fs->req_cyl) {
528 if (fs->retries > 5) {
529 swim3_end_request_cur(-EIO);
530 fs->state = idle;
531 return;
532 }
533 fs->state = seeking;
534 break;
535 }
536 setup_transfer(fs);
537 return;
538
539 case jogging:
540 seek_track(fs, -5);
541 return;
542
543 default:
544 printk(KERN_ERR"swim3: unknown state %d\n", fs->state);
545 return;
546 }
547 }
548 }
549
550 static void scan_timeout(unsigned long data)
551 {
552 struct floppy_state *fs = (struct floppy_state *) data;
553 struct swim3 __iomem *sw = fs->swim3;
554
555 fs->timeout_pending = 0;
556 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
557 out_8(&sw->select, RELAX);
558 out_8(&sw->intr_enable, 0);
559 fs->cur_cyl = -1;
560 if (fs->retries > 5) {
561 swim3_end_request_cur(-EIO);
562 fs->state = idle;
563 start_request(fs);
564 } else {
565 fs->state = jogging;
566 act(fs);
567 }
568 }
569
570 static void seek_timeout(unsigned long data)
571 {
572 struct floppy_state *fs = (struct floppy_state *) data;
573 struct swim3 __iomem *sw = fs->swim3;
574
575 fs->timeout_pending = 0;
576 out_8(&sw->control_bic, DO_SEEK);
577 out_8(&sw->select, RELAX);
578 out_8(&sw->intr_enable, 0);
579 printk(KERN_ERR "swim3: seek timeout\n");
580 swim3_end_request_cur(-EIO);
581 fs->state = idle;
582 start_request(fs);
583 }
584
585 static void settle_timeout(unsigned long data)
586 {
587 struct floppy_state *fs = (struct floppy_state *) data;
588 struct swim3 __iomem *sw = fs->swim3;
589
590 fs->timeout_pending = 0;
591 if (swim3_readbit(fs, SEEK_COMPLETE)) {
592 out_8(&sw->select, RELAX);
593 fs->state = locating;
594 act(fs);
595 return;
596 }
597 out_8(&sw->select, RELAX);
598 if (fs->settle_time < 2*HZ) {
599 ++fs->settle_time;
600 set_timeout(fs, 1, settle_timeout);
601 return;
602 }
603 printk(KERN_ERR "swim3: seek settle timeout\n");
604 swim3_end_request_cur(-EIO);
605 fs->state = idle;
606 start_request(fs);
607 }
608
609 static void xfer_timeout(unsigned long data)
610 {
611 struct floppy_state *fs = (struct floppy_state *) data;
612 struct swim3 __iomem *sw = fs->swim3;
613 struct dbdma_regs __iomem *dr = fs->dma;
614 int n;
615
616 fs->timeout_pending = 0;
617 out_le32(&dr->control, RUN << 16);
618 /* We must wait a bit for dbdma to stop */
619 for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
620 udelay(1);
621 out_8(&sw->intr_enable, 0);
622 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
623 out_8(&sw->select, RELAX);
624 printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
625 (rq_data_dir(fd_req)==WRITE? "writ": "read"),
626 (long)blk_rq_pos(fd_req));
627 swim3_end_request_cur(-EIO);
628 fs->state = idle;
629 start_request(fs);
630 }
631
632 static irqreturn_t swim3_interrupt(int irq, void *dev_id)
633 {
634 struct floppy_state *fs = (struct floppy_state *) dev_id;
635 struct swim3 __iomem *sw = fs->swim3;
636 int intr, err, n;
637 int stat, resid;
638 struct dbdma_regs __iomem *dr;
639 struct dbdma_cmd *cp;
640
641 intr = in_8(&sw->intr);
642 err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
643 if ((intr & ERROR_INTR) && fs->state != do_transfer)
644 printk(KERN_ERR "swim3_interrupt, state=%d, dir=%x, intr=%x, err=%x\n",
645 fs->state, rq_data_dir(fd_req), intr, err);
646 switch (fs->state) {
647 case locating:
648 if (intr & SEEN_SECTOR) {
649 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
650 out_8(&sw->select, RELAX);
651 out_8(&sw->intr_enable, 0);
652 del_timer(&fs->timeout);
653 fs->timeout_pending = 0;
654 if (sw->ctrack == 0xff) {
655 printk(KERN_ERR "swim3: seen sector but cyl=ff?\n");
656 fs->cur_cyl = -1;
657 if (fs->retries > 5) {
658 swim3_end_request_cur(-EIO);
659 fs->state = idle;
660 start_request(fs);
661 } else {
662 fs->state = jogging;
663 act(fs);
664 }
665 break;
666 }
667 fs->cur_cyl = sw->ctrack;
668 fs->cur_sector = sw->csect;
669 if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
670 printk(KERN_ERR "swim3: expected cyl %d, got %d\n",
671 fs->expect_cyl, fs->cur_cyl);
672 fs->state = do_transfer;
673 act(fs);
674 }
675 break;
676 case seeking:
677 case jogging:
678 if (sw->nseek == 0) {
679 out_8(&sw->control_bic, DO_SEEK);
680 out_8(&sw->select, RELAX);
681 out_8(&sw->intr_enable, 0);
682 del_timer(&fs->timeout);
683 fs->timeout_pending = 0;
684 if (fs->state == seeking)
685 ++fs->retries;
686 fs->state = settling;
687 act(fs);
688 }
689 break;
690 case settling:
691 out_8(&sw->intr_enable, 0);
692 del_timer(&fs->timeout);
693 fs->timeout_pending = 0;
694 act(fs);
695 break;
696 case do_transfer:
697 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
698 break;
699 out_8(&sw->intr_enable, 0);
700 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
701 out_8(&sw->select, RELAX);
702 del_timer(&fs->timeout);
703 fs->timeout_pending = 0;
704 dr = fs->dma;
705 cp = fs->dma_cmd;
706 if (rq_data_dir(fd_req) == WRITE)
707 ++cp;
708 /*
709 * Check that the main data transfer has finished.
710 * On writing, the swim3 sometimes doesn't use
711 * up all the bytes of the postamble, so we can still
712 * see DMA active here. That doesn't matter as long
713 * as all the sector data has been transferred.
714 */
715 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
716 /* wait a little while for DMA to complete */
717 for (n = 0; n < 100; ++n) {
718 if (cp->xfer_status != 0)
719 break;
720 udelay(1);
721 barrier();
722 }
723 }
724 /* turn off DMA */
725 out_le32(&dr->control, (RUN | PAUSE) << 16);
726 stat = ld_le16(&cp->xfer_status);
727 resid = ld_le16(&cp->res_count);
728 if (intr & ERROR_INTR) {
729 n = fs->scount - 1 - resid / 512;
730 if (n > 0) {
731 blk_update_request(fd_req, 0, n << 9);
732 fs->req_sector += n;
733 }
734 if (fs->retries < 5) {
735 ++fs->retries;
736 act(fs);
737 } else {
738 printk("swim3: error %sing block %ld (err=%x)\n",
739 rq_data_dir(fd_req) == WRITE? "writ": "read",
740 (long)blk_rq_pos(fd_req), err);
741 swim3_end_request_cur(-EIO);
742 fs->state = idle;
743 }
744 } else {
745 if ((stat & ACTIVE) == 0 || resid != 0) {
746 /* musta been an error */
747 printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid);
748 printk(KERN_ERR " state=%d, dir=%x, intr=%x, err=%x\n",
749 fs->state, rq_data_dir(fd_req), intr, err);
750 swim3_end_request_cur(-EIO);
751 fs->state = idle;
752 start_request(fs);
753 break;
754 }
755 if (swim3_end_request(0, fs->scount << 9)) {
756 fs->req_sector += fs->scount;
757 if (fs->req_sector > fs->secpertrack) {
758 fs->req_sector -= fs->secpertrack;
759 if (++fs->head > 1) {
760 fs->head = 0;
761 ++fs->req_cyl;
762 }
763 }
764 act(fs);
765 } else
766 fs->state = idle;
767 }
768 if (fs->state == idle)
769 start_request(fs);
770 break;
771 default:
772 printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state);
773 }
774 return IRQ_HANDLED;
775 }
776
777 /*
778 static void fd_dma_interrupt(int irq, void *dev_id)
779 {
780 }
781 */
782
783 static int grab_drive(struct floppy_state *fs, enum swim_state state,
784 int interruptible)
785 {
786 unsigned long flags;
787
788 spin_lock_irqsave(&fs->lock, flags);
789 if (fs->state != idle) {
790 ++fs->wanted;
791 while (fs->state != available) {
792 if (interruptible && signal_pending(current)) {
793 --fs->wanted;
794 spin_unlock_irqrestore(&fs->lock, flags);
795 return -EINTR;
796 }
797 interruptible_sleep_on(&fs->wait);
798 }
799 --fs->wanted;
800 }
801 fs->state = state;
802 spin_unlock_irqrestore(&fs->lock, flags);
803 return 0;
804 }
805
806 static void release_drive(struct floppy_state *fs)
807 {
808 unsigned long flags;
809
810 spin_lock_irqsave(&fs->lock, flags);
811 fs->state = idle;
812 start_request(fs);
813 spin_unlock_irqrestore(&fs->lock, flags);
814 }
815
816 static int fd_eject(struct floppy_state *fs)
817 {
818 int err, n;
819
820 err = grab_drive(fs, ejecting, 1);
821 if (err)
822 return err;
823 swim3_action(fs, EJECT);
824 for (n = 20; n > 0; --n) {
825 if (signal_pending(current)) {
826 err = -EINTR;
827 break;
828 }
829 swim3_select(fs, RELAX);
830 schedule_timeout_interruptible(1);
831 if (swim3_readbit(fs, DISK_IN) == 0)
832 break;
833 }
834 swim3_select(fs, RELAX);
835 udelay(150);
836 fs->ejected = 1;
837 release_drive(fs);
838 return err;
839 }
840
841 static struct floppy_struct floppy_type =
842 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL }; /* 7 1.44MB 3.5" */
843
844 static int floppy_locked_ioctl(struct block_device *bdev, fmode_t mode,
845 unsigned int cmd, unsigned long param)
846 {
847 struct floppy_state *fs = bdev->bd_disk->private_data;
848 int err;
849
850 if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
851 return -EPERM;
852
853 if (fs->mdev->media_bay &&
854 check_media_bay(fs->mdev->media_bay) != MB_FD)
855 return -ENXIO;
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_ioctl(struct block_device *bdev, fmode_t mode,
873 unsigned int cmd, unsigned long param)
874 {
875 int ret;
876
877 mutex_lock(&swim3_mutex);
878 ret = floppy_locked_ioctl(bdev, mode, cmd, param);
879 mutex_unlock(&swim3_mutex);
880
881 return ret;
882 }
883
884 static int floppy_open(struct block_device *bdev, fmode_t mode)
885 {
886 struct floppy_state *fs = bdev->bd_disk->private_data;
887 struct swim3 __iomem *sw = fs->swim3;
888 int n, err = 0;
889
890 if (fs->ref_count == 0) {
891 if (fs->mdev->media_bay &&
892 check_media_bay(fs->mdev->media_bay) != MB_FD)
893 return -ENXIO;
894 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
895 out_8(&sw->control_bic, 0xff);
896 out_8(&sw->mode, 0x95);
897 udelay(10);
898 out_8(&sw->intr_enable, 0);
899 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
900 swim3_action(fs, MOTOR_ON);
901 fs->write_prot = -1;
902 fs->cur_cyl = -1;
903 for (n = 0; n < 2 * HZ; ++n) {
904 if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
905 break;
906 if (signal_pending(current)) {
907 err = -EINTR;
908 break;
909 }
910 swim3_select(fs, RELAX);
911 schedule_timeout_interruptible(1);
912 }
913 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
914 || swim3_readbit(fs, DISK_IN) == 0))
915 err = -ENXIO;
916 swim3_action(fs, SETMFM);
917 swim3_select(fs, RELAX);
918
919 } else if (fs->ref_count == -1 || mode & FMODE_EXCL)
920 return -EBUSY;
921
922 if (err == 0 && (mode & FMODE_NDELAY) == 0
923 && (mode & (FMODE_READ|FMODE_WRITE))) {
924 check_disk_change(bdev);
925 if (fs->ejected)
926 err = -ENXIO;
927 }
928
929 if (err == 0 && (mode & FMODE_WRITE)) {
930 if (fs->write_prot < 0)
931 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
932 if (fs->write_prot)
933 err = -EROFS;
934 }
935
936 if (err) {
937 if (fs->ref_count == 0) {
938 swim3_action(fs, MOTOR_OFF);
939 out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
940 swim3_select(fs, RELAX);
941 }
942 return err;
943 }
944
945 if (mode & FMODE_EXCL)
946 fs->ref_count = -1;
947 else
948 ++fs->ref_count;
949
950 return 0;
951 }
952
953 static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
954 {
955 int ret;
956
957 mutex_lock(&swim3_mutex);
958 ret = floppy_open(bdev, mode);
959 mutex_unlock(&swim3_mutex);
960
961 return ret;
962 }
963
964 static int floppy_release(struct gendisk *disk, fmode_t mode)
965 {
966 struct floppy_state *fs = disk->private_data;
967 struct swim3 __iomem *sw = fs->swim3;
968 mutex_lock(&swim3_mutex);
969 if (fs->ref_count > 0 && --fs->ref_count == 0) {
970 swim3_action(fs, MOTOR_OFF);
971 out_8(&sw->control_bic, 0xff);
972 swim3_select(fs, RELAX);
973 }
974 mutex_unlock(&swim3_mutex);
975 return 0;
976 }
977
978 static int floppy_check_change(struct gendisk *disk)
979 {
980 struct floppy_state *fs = disk->private_data;
981 return fs->ejected;
982 }
983
984 static int floppy_revalidate(struct gendisk *disk)
985 {
986 struct floppy_state *fs = disk->private_data;
987 struct swim3 __iomem *sw;
988 int ret, n;
989
990 if (fs->mdev->media_bay &&
991 check_media_bay(fs->mdev->media_bay) != MB_FD)
992 return -ENXIO;
993
994 sw = fs->swim3;
995 grab_drive(fs, revalidating, 0);
996 out_8(&sw->intr_enable, 0);
997 out_8(&sw->control_bis, DRIVE_ENABLE);
998 swim3_action(fs, MOTOR_ON); /* necessary? */
999 fs->write_prot = -1;
1000 fs->cur_cyl = -1;
1001 mdelay(1);
1002 for (n = HZ; n > 0; --n) {
1003 if (swim3_readbit(fs, SEEK_COMPLETE))
1004 break;
1005 if (signal_pending(current))
1006 break;
1007 swim3_select(fs, RELAX);
1008 schedule_timeout_interruptible(1);
1009 }
1010 ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
1011 || swim3_readbit(fs, DISK_IN) == 0;
1012 if (ret)
1013 swim3_action(fs, MOTOR_OFF);
1014 else {
1015 fs->ejected = 0;
1016 swim3_action(fs, SETMFM);
1017 }
1018 swim3_select(fs, RELAX);
1019
1020 release_drive(fs);
1021 return ret;
1022 }
1023
1024 static const struct block_device_operations floppy_fops = {
1025 .open = floppy_unlocked_open,
1026 .release = floppy_release,
1027 .ioctl = floppy_ioctl,
1028 .media_changed = floppy_check_change,
1029 .revalidate_disk= floppy_revalidate,
1030 };
1031
1032 static int swim3_add_device(struct macio_dev *mdev, int index)
1033 {
1034 struct device_node *swim = mdev->ofdev.dev.of_node;
1035 struct floppy_state *fs = &floppy_states[index];
1036 int rc = -EBUSY;
1037
1038 /* Check & Request resources */
1039 if (macio_resource_count(mdev) < 2) {
1040 printk(KERN_WARNING "ifd%d: no address for %s\n",
1041 index, swim->full_name);
1042 return -ENXIO;
1043 }
1044 if (macio_irq_count(mdev) < 2) {
1045 printk(KERN_WARNING "fd%d: no intrs for device %s\n",
1046 index, swim->full_name);
1047 }
1048 if (macio_request_resource(mdev, 0, "swim3 (mmio)")) {
1049 printk(KERN_ERR "fd%d: can't request mmio resource for %s\n",
1050 index, swim->full_name);
1051 return -EBUSY;
1052 }
1053 if (macio_request_resource(mdev, 1, "swim3 (dma)")) {
1054 printk(KERN_ERR "fd%d: can't request dma resource for %s\n",
1055 index, swim->full_name);
1056 macio_release_resource(mdev, 0);
1057 return -EBUSY;
1058 }
1059 dev_set_drvdata(&mdev->ofdev.dev, fs);
1060
1061 if (mdev->media_bay == NULL)
1062 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1063
1064 memset(fs, 0, sizeof(*fs));
1065 spin_lock_init(&fs->lock);
1066 fs->state = idle;
1067 fs->swim3 = (struct swim3 __iomem *)
1068 ioremap(macio_resource_start(mdev, 0), 0x200);
1069 if (fs->swim3 == NULL) {
1070 printk("fd%d: couldn't map registers for %s\n",
1071 index, swim->full_name);
1072 rc = -ENOMEM;
1073 goto out_release;
1074 }
1075 fs->dma = (struct dbdma_regs __iomem *)
1076 ioremap(macio_resource_start(mdev, 1), 0x200);
1077 if (fs->dma == NULL) {
1078 printk("fd%d: couldn't map DMA for %s\n",
1079 index, swim->full_name);
1080 iounmap(fs->swim3);
1081 rc = -ENOMEM;
1082 goto out_release;
1083 }
1084 fs->swim3_intr = macio_irq(mdev, 0);
1085 fs->dma_intr = macio_irq(mdev, 1);
1086 fs->cur_cyl = -1;
1087 fs->cur_sector = -1;
1088 fs->secpercyl = 36;
1089 fs->secpertrack = 18;
1090 fs->total_secs = 2880;
1091 fs->mdev = mdev;
1092 init_waitqueue_head(&fs->wait);
1093
1094 fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1095 memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1096 st_le16(&fs->dma_cmd[1].command, DBDMA_STOP);
1097
1098 if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1099 printk(KERN_ERR "fd%d: couldn't request irq %d for %s\n",
1100 index, fs->swim3_intr, swim->full_name);
1101 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1102 goto out_unmap;
1103 return -EBUSY;
1104 }
1105 /*
1106 if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) {
1107 printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA",
1108 fs->dma_intr);
1109 return -EBUSY;
1110 }
1111 */
1112
1113 init_timer(&fs->timeout);
1114
1115 printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count,
1116 mdev->media_bay ? "in media bay" : "");
1117
1118 return 0;
1119
1120 out_unmap:
1121 iounmap(fs->dma);
1122 iounmap(fs->swim3);
1123
1124 out_release:
1125 macio_release_resource(mdev, 0);
1126 macio_release_resource(mdev, 1);
1127
1128 return rc;
1129 }
1130
1131 static int __devinit swim3_attach(struct macio_dev *mdev, const struct of_device_id *match)
1132 {
1133 int i, rc;
1134 struct gendisk *disk;
1135
1136 /* Add the drive */
1137 rc = swim3_add_device(mdev, floppy_count);
1138 if (rc)
1139 return rc;
1140
1141 /* Now create the queue if not there yet */
1142 if (swim3_queue == NULL) {
1143 /* If we failed, there isn't much we can do as the driver is still
1144 * too dumb to remove the device, just bail out
1145 */
1146 if (register_blkdev(FLOPPY_MAJOR, "fd"))
1147 return 0;
1148 swim3_queue = blk_init_queue(do_fd_request, &swim3_lock);
1149 if (swim3_queue == NULL) {
1150 unregister_blkdev(FLOPPY_MAJOR, "fd");
1151 return 0;
1152 }
1153 }
1154
1155 /* Now register that disk. Same comment about failure handling */
1156 i = floppy_count++;
1157 disk = disks[i] = alloc_disk(1);
1158 if (disk == NULL)
1159 return 0;
1160
1161 disk->major = FLOPPY_MAJOR;
1162 disk->first_minor = i;
1163 disk->fops = &floppy_fops;
1164 disk->private_data = &floppy_states[i];
1165 disk->queue = swim3_queue;
1166 disk->flags |= GENHD_FL_REMOVABLE;
1167 sprintf(disk->disk_name, "fd%d", i);
1168 set_capacity(disk, 2880);
1169 add_disk(disk);
1170
1171 return 0;
1172 }
1173
1174 static struct of_device_id swim3_match[] =
1175 {
1176 {
1177 .name = "swim3",
1178 },
1179 {
1180 .compatible = "ohare-swim3"
1181 },
1182 {
1183 .compatible = "swim3"
1184 },
1185 };
1186
1187 static struct macio_driver swim3_driver =
1188 {
1189 .driver = {
1190 .name = "swim3",
1191 .of_match_table = swim3_match,
1192 },
1193 .probe = swim3_attach,
1194 #if 0
1195 .suspend = swim3_suspend,
1196 .resume = swim3_resume,
1197 #endif
1198 };
1199
1200
1201 int swim3_init(void)
1202 {
1203 macio_register_driver(&swim3_driver);
1204 return 0;
1205 }
1206
1207 module_init(swim3_init)
1208
1209 MODULE_LICENSE("GPL");
1210 MODULE_AUTHOR("Paul Mackerras");
1211 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);
CJK support for tty framebuffer vt