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Linux 6.13-rc4
[linux.git] / drivers / block / swim3.c
blob90be1017f7bfcdf8f89744de6a678b4262e80a4e
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Driver for the SWIM3 (Super Woz Integrated Machine 3)
4 * floppy controller found on Power Macintoshes.
5 *
6 * Copyright (C) 1996 Paul Mackerras.
7 */
8
9 /*
10 * TODO:
11 * handle 2 drives
12 * handle GCR disks
13 */
14
15 #undef DEBUG
16
17 #include <linux/stddef.h>
18 #include <linux/kernel.h>
19 #include <linux/sched/signal.h>
20 #include <linux/timer.h>
21 #include <linux/delay.h>
22 #include <linux/fd.h>
23 #include <linux/ioctl.h>
24 #include <linux/blk-mq.h>
25 #include <linux/interrupt.h>
26 #include <linux/mutex.h>
27 #include <linux/module.h>
28 #include <linux/spinlock.h>
29 #include <linux/wait.h>
30 #include <linux/major.h>
31 #include <asm/io.h>
32 #include <asm/dbdma.h>
33 #include <asm/prom.h>
34 #include <linux/uaccess.h>
35 #include <asm/mediabay.h>
36 #include <asm/machdep.h>
37 #include <asm/pmac_feature.h>
38
39 #define MAX_FLOPPIES 2
40
41 static DEFINE_MUTEX(swim3_mutex);
42 static struct gendisk *disks[MAX_FLOPPIES];
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 ONEMEG_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 GCR_MODE 13
157 #define SEEK_COMPLETE 14
158 #define TWOMEG_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 struct swim3 __iomem *swim3; /* hardware registers */
179 struct dbdma_regs __iomem *dma; /* DMA controller registers */
180 int swim3_intr; /* interrupt number for SWIM3 */
181 int dma_intr; /* interrupt number for DMA channel */
182 int cur_cyl; /* cylinder head is on, or -1 */
183 int cur_sector; /* last sector we saw go past */
184 int req_cyl; /* the cylinder for the current r/w request */
185 int head; /* head number ditto */
186 int req_sector; /* sector number ditto */
187 int scount; /* # sectors we're transferring at present */
188 int retries;
189 int settle_time;
190 int secpercyl; /* disk geometry information */
191 int secpertrack;
192 int total_secs;
193 int write_prot; /* 1 if write-protected, 0 if not, -1 dunno */
194 struct dbdma_cmd *dma_cmd;
195 int ref_count;
196 int expect_cyl;
197 struct timer_list timeout;
198 int timeout_pending;
199 int ejected;
200 wait_queue_head_t wait;
201 int wanted;
202 struct macio_dev *mdev;
203 char dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)];
204 int index;
205 struct request *cur_req;
206 struct blk_mq_tag_set tag_set;
207 };
208
209 #define swim3_err(fmt, arg...) dev_err(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
210 #define swim3_warn(fmt, arg...) dev_warn(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
211 #define swim3_info(fmt, arg...) dev_info(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
212
213 #ifdef DEBUG
214 #define swim3_dbg(fmt, arg...) dev_dbg(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)
215 #else
216 #define swim3_dbg(fmt, arg...) do { } while(0)
217 #endif
218
219 static struct floppy_state floppy_states[MAX_FLOPPIES];
220 static int floppy_count = 0;
221 static DEFINE_SPINLOCK(swim3_lock);
222
223 static unsigned short write_preamble[] = {
224 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */
225 0, 0, 0, 0, 0, 0, /* sync field */
226 0x99a1, 0x99a1, 0x99a1, 0x99fb, /* data address mark */
227 0x990f /* no escape for 512 bytes */
228 };
229
230 static unsigned short write_postamble[] = {
231 0x9904, /* insert CRC */
232 0x4e4e, 0x4e4e,
233 0x9908, /* stop writing */
234 0, 0, 0, 0, 0, 0
235 };
236
237 static void seek_track(struct floppy_state *fs, int n);
238 static void act(struct floppy_state *fs);
239 static void scan_timeout(struct timer_list *t);
240 static void seek_timeout(struct timer_list *t);
241 static void settle_timeout(struct timer_list *t);
242 static void xfer_timeout(struct timer_list *t);
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, blk_mode_t mode,
250 unsigned int cmd, unsigned long param);
251 static int floppy_open(struct gendisk *disk, blk_mode_t mode);
252 static unsigned int floppy_check_events(struct gendisk *disk,
253 unsigned int clearing);
254 static int floppy_revalidate(struct gendisk *disk);
255
256 static bool swim3_end_request(struct floppy_state *fs, blk_status_t err, unsigned int nr_bytes)
257 {
258 struct request *req = fs->cur_req;
259
260 swim3_dbg(" end request, err=%d nr_bytes=%d, cur_req=%p\n",
261 err, nr_bytes, req);
262
263 if (err)
264 nr_bytes = blk_rq_cur_bytes(req);
265 if (blk_update_request(req, err, nr_bytes))
266 return true;
267 __blk_mq_end_request(req, err);
268 fs->cur_req = NULL;
269 return false;
270 }
271
272 static void swim3_select(struct floppy_state *fs, int sel)
273 {
274 struct swim3 __iomem *sw = fs->swim3;
275
276 out_8(&sw->select, RELAX);
277 if (sel & 8)
278 out_8(&sw->control_bis, SELECT);
279 else
280 out_8(&sw->control_bic, SELECT);
281 out_8(&sw->select, sel & CA_MASK);
282 }
283
284 static void swim3_action(struct floppy_state *fs, int action)
285 {
286 struct swim3 __iomem *sw = fs->swim3;
287
288 swim3_select(fs, action);
289 udelay(1);
290 out_8(&sw->select, sw->select | LSTRB);
291 udelay(2);
292 out_8(&sw->select, sw->select & ~LSTRB);
293 udelay(1);
294 }
295
296 static int swim3_readbit(struct floppy_state *fs, int bit)
297 {
298 struct swim3 __iomem *sw = fs->swim3;
299 int stat;
300
301 swim3_select(fs, bit);
302 udelay(1);
303 stat = in_8(&sw->status);
304 return (stat & DATA) == 0;
305 }
306
307 static blk_status_t swim3_queue_rq(struct blk_mq_hw_ctx *hctx,
308 const struct blk_mq_queue_data *bd)
309 {
310 struct floppy_state *fs = hctx->queue->queuedata;
311 struct request *req = bd->rq;
312 unsigned long x;
313
314 spin_lock_irq(&swim3_lock);
315 if (fs->cur_req || fs->state != idle) {
316 spin_unlock_irq(&swim3_lock);
317 return BLK_STS_DEV_RESOURCE;
318 }
319 blk_mq_start_request(req);
320 fs->cur_req = req;
321 if (fs->mdev->media_bay &&
322 check_media_bay(fs->mdev->media_bay) != MB_FD) {
323 swim3_dbg("%s", " media bay absent, dropping req\n");
324 swim3_end_request(fs, BLK_STS_IOERR, 0);
325 goto out;
326 }
327 if (fs->ejected) {
328 swim3_dbg("%s", " disk ejected\n");
329 swim3_end_request(fs, BLK_STS_IOERR, 0);
330 goto out;
331 }
332 if (rq_data_dir(req) == WRITE) {
333 if (fs->write_prot < 0)
334 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
335 if (fs->write_prot) {
336 swim3_dbg("%s", " try to write, disk write protected\n");
337 swim3_end_request(fs, BLK_STS_IOERR, 0);
338 goto out;
339 }
340 }
341
342 /*
343 * Do not remove the cast. blk_rq_pos(req) is now a sector_t and can be
344 * 64 bits, but it will never go past 32 bits for this driver anyway, so
345 * we can safely cast it down and not have to do a 64/32 division
346 */
347 fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl;
348 x = ((long)blk_rq_pos(req)) % fs->secpercyl;
349 fs->head = x / fs->secpertrack;
350 fs->req_sector = x % fs->secpertrack + 1;
351 fs->state = do_transfer;
352 fs->retries = 0;
353
354 act(fs);
355
356 out:
357 spin_unlock_irq(&swim3_lock);
358 return BLK_STS_OK;
359 }
360
361 static void set_timeout(struct floppy_state *fs, int nticks,
362 void (*proc)(struct timer_list *t))
363 {
364 if (fs->timeout_pending)
365 del_timer(&fs->timeout);
366 fs->timeout.expires = jiffies + nticks;
367 fs->timeout.function = proc;
368 add_timer(&fs->timeout);
369 fs->timeout_pending = 1;
370 }
371
372 static inline void scan_track(struct floppy_state *fs)
373 {
374 struct swim3 __iomem *sw = fs->swim3;
375
376 swim3_select(fs, READ_DATA_0);
377 in_8(&sw->intr); /* clear SEEN_SECTOR bit */
378 in_8(&sw->error);
379 out_8(&sw->intr_enable, SEEN_SECTOR);
380 out_8(&sw->control_bis, DO_ACTION);
381 /* enable intr when track found */
382 set_timeout(fs, HZ, scan_timeout); /* enable timeout */
383 }
384
385 static inline void seek_track(struct floppy_state *fs, int n)
386 {
387 struct swim3 __iomem *sw = fs->swim3;
388
389 if (n >= 0) {
390 swim3_action(fs, SEEK_POSITIVE);
391 sw->nseek = n;
392 } else {
393 swim3_action(fs, SEEK_NEGATIVE);
394 sw->nseek = -n;
395 }
396 fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
397 swim3_select(fs, STEP);
398 in_8(&sw->error);
399 /* enable intr when seek finished */
400 out_8(&sw->intr_enable, SEEK_DONE);
401 out_8(&sw->control_bis, DO_SEEK);
402 set_timeout(fs, 3*HZ, seek_timeout); /* enable timeout */
403 fs->settle_time = 0;
404 }
405
406 /*
407 * XXX: this is a horrible hack, but at least allows ppc32 to get
408 * out of defining virt_to_bus, and this driver out of using the
409 * deprecated block layer bounce buffering for highmem addresses
410 * for no good reason.
411 */
412 static unsigned long swim3_phys_to_bus(phys_addr_t paddr)
413 {
414 return paddr + PCI_DRAM_OFFSET;
415 }
416
417 static phys_addr_t swim3_bio_phys(struct bio *bio)
418 {
419 return page_to_phys(bio_page(bio)) + bio_offset(bio);
420 }
421
422 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
423 phys_addr_t paddr, int count)
424 {
425 cp->req_count = cpu_to_le16(count);
426 cp->command = cpu_to_le16(cmd);
427 cp->phy_addr = cpu_to_le32(swim3_phys_to_bus(paddr));
428 cp->xfer_status = 0;
429 }
430
431 static inline void setup_transfer(struct floppy_state *fs)
432 {
433 int n;
434 struct swim3 __iomem *sw = fs->swim3;
435 struct dbdma_cmd *cp = fs->dma_cmd;
436 struct dbdma_regs __iomem *dr = fs->dma;
437 struct request *req = fs->cur_req;
438
439 if (blk_rq_cur_sectors(req) <= 0) {
440 swim3_warn("%s", "Transfer 0 sectors ?\n");
441 return;
442 }
443 if (rq_data_dir(req) == WRITE)
444 n = 1;
445 else {
446 n = fs->secpertrack - fs->req_sector + 1;
447 if (n > blk_rq_cur_sectors(req))
448 n = blk_rq_cur_sectors(req);
449 }
450
451 swim3_dbg(" setup xfer at sect %d (of %d) head %d for %d\n",
452 fs->req_sector, fs->secpertrack, fs->head, n);
453
454 fs->scount = n;
455 swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
456 out_8(&sw->sector, fs->req_sector);
457 out_8(&sw->nsect, n);
458 out_8(&sw->gap3, 0);
459 out_le32(&dr->cmdptr, swim3_phys_to_bus(virt_to_phys(cp)));
460 if (rq_data_dir(req) == WRITE) {
461 /* Set up 3 dma commands: write preamble, data, postamble */
462 init_dma(cp, OUTPUT_MORE, virt_to_phys(write_preamble),
463 sizeof(write_preamble));
464 ++cp;
465 init_dma(cp, OUTPUT_MORE, swim3_bio_phys(req->bio), 512);
466 ++cp;
467 init_dma(cp, OUTPUT_LAST, virt_to_phys(write_postamble),
468 sizeof(write_postamble));
469 } else {
470 init_dma(cp, INPUT_LAST, swim3_bio_phys(req->bio), 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(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 swim3_dbg(" act loop, state=%d, req_cyl=%d, cur_cyl=%d\n",
491 fs->state, fs->req_cyl, fs->cur_cyl);
492
493 switch (fs->state) {
494 case idle:
495 return; /* XXX shouldn't get here */
496
497 case locating:
498 if (swim3_readbit(fs, TRACK_ZERO)) {
499 swim3_dbg("%s", " locate track 0\n");
500 fs->cur_cyl = 0;
501 if (fs->req_cyl == 0)
502 fs->state = do_transfer;
503 else
504 fs->state = seeking;
505 break;
506 }
507 scan_track(fs);
508 return;
509
510 case seeking:
511 if (fs->cur_cyl < 0) {
512 fs->expect_cyl = -1;
513 fs->state = locating;
514 break;
515 }
516 if (fs->req_cyl == fs->cur_cyl) {
517 swim3_warn("%s", "Whoops, seeking 0\n");
518 fs->state = do_transfer;
519 break;
520 }
521 seek_track(fs, fs->req_cyl - fs->cur_cyl);
522 return;
523
524 case settling:
525 /* check for SEEK_COMPLETE after 30ms */
526 fs->settle_time = (HZ + 32) / 33;
527 set_timeout(fs, fs->settle_time, settle_timeout);
528 return;
529
530 case do_transfer:
531 if (fs->cur_cyl != fs->req_cyl) {
532 if (fs->retries > 5) {
533 swim3_err("Wrong cylinder in transfer, want: %d got %d\n",
534 fs->req_cyl, fs->cur_cyl);
535 swim3_end_request(fs, BLK_STS_IOERR, 0);
536 fs->state = idle;
537 return;
538 }
539 fs->state = seeking;
540 break;
541 }
542 setup_transfer(fs);
543 return;
544
545 case jogging:
546 seek_track(fs, -5);
547 return;
548
549 default:
550 swim3_err("Unknown state %d\n", fs->state);
551 return;
552 }
553 }
554 }
555
556 static void scan_timeout(struct timer_list *t)
557 {
558 struct floppy_state *fs = from_timer(fs, t, timeout);
559 struct swim3 __iomem *sw = fs->swim3;
560 unsigned long flags;
561
562 swim3_dbg("* scan timeout, state=%d\n", fs->state);
563
564 spin_lock_irqsave(&swim3_lock, flags);
565 fs->timeout_pending = 0;
566 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
567 out_8(&sw->select, RELAX);
568 out_8(&sw->intr_enable, 0);
569 fs->cur_cyl = -1;
570 if (fs->retries > 5) {
571 swim3_end_request(fs, BLK_STS_IOERR, 0);
572 fs->state = idle;
573 } else {
574 fs->state = jogging;
575 act(fs);
576 }
577 spin_unlock_irqrestore(&swim3_lock, flags);
578 }
579
580 static void seek_timeout(struct timer_list *t)
581 {
582 struct floppy_state *fs = from_timer(fs, t, timeout);
583 struct swim3 __iomem *sw = fs->swim3;
584 unsigned long flags;
585
586 swim3_dbg("* seek timeout, state=%d\n", fs->state);
587
588 spin_lock_irqsave(&swim3_lock, flags);
589 fs->timeout_pending = 0;
590 out_8(&sw->control_bic, DO_SEEK);
591 out_8(&sw->select, RELAX);
592 out_8(&sw->intr_enable, 0);
593 swim3_err("%s", "Seek timeout\n");
594 swim3_end_request(fs, BLK_STS_IOERR, 0);
595 fs->state = idle;
596 spin_unlock_irqrestore(&swim3_lock, flags);
597 }
598
599 static void settle_timeout(struct timer_list *t)
600 {
601 struct floppy_state *fs = from_timer(fs, t, timeout);
602 struct swim3 __iomem *sw = fs->swim3;
603 unsigned long flags;
604
605 swim3_dbg("* settle timeout, state=%d\n", fs->state);
606
607 spin_lock_irqsave(&swim3_lock, flags);
608 fs->timeout_pending = 0;
609 if (swim3_readbit(fs, SEEK_COMPLETE)) {
610 out_8(&sw->select, RELAX);
611 fs->state = locating;
612 act(fs);
613 goto unlock;
614 }
615 out_8(&sw->select, RELAX);
616 if (fs->settle_time < 2*HZ) {
617 ++fs->settle_time;
618 set_timeout(fs, 1, settle_timeout);
619 goto unlock;
620 }
621 swim3_err("%s", "Seek settle timeout\n");
622 swim3_end_request(fs, BLK_STS_IOERR, 0);
623 fs->state = idle;
624 unlock:
625 spin_unlock_irqrestore(&swim3_lock, flags);
626 }
627
628 static void xfer_timeout(struct timer_list *t)
629 {
630 struct floppy_state *fs = from_timer(fs, t, timeout);
631 struct swim3 __iomem *sw = fs->swim3;
632 struct dbdma_regs __iomem *dr = fs->dma;
633 unsigned long flags;
634 int n;
635
636 swim3_dbg("* xfer timeout, state=%d\n", fs->state);
637
638 spin_lock_irqsave(&swim3_lock, flags);
639 fs->timeout_pending = 0;
640 out_le32(&dr->control, RUN << 16);
641 /* We must wait a bit for dbdma to stop */
642 for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
643 udelay(1);
644 out_8(&sw->intr_enable, 0);
645 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
646 out_8(&sw->select, RELAX);
647 swim3_err("Timeout %sing sector %ld\n",
648 (rq_data_dir(fs->cur_req)==WRITE? "writ": "read"),
649 (long)blk_rq_pos(fs->cur_req));
650 swim3_end_request(fs, BLK_STS_IOERR, 0);
651 fs->state = idle;
652 spin_unlock_irqrestore(&swim3_lock, flags);
653 }
654
655 static irqreturn_t swim3_interrupt(int irq, void *dev_id)
656 {
657 struct floppy_state *fs = (struct floppy_state *) dev_id;
658 struct swim3 __iomem *sw = fs->swim3;
659 int intr, err, n;
660 int stat, resid;
661 struct dbdma_regs __iomem *dr;
662 struct dbdma_cmd *cp;
663 unsigned long flags;
664 struct request *req = fs->cur_req;
665
666 swim3_dbg("* interrupt, state=%d\n", fs->state);
667
668 spin_lock_irqsave(&swim3_lock, flags);
669 intr = in_8(&sw->intr);
670 err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
671 if ((intr & ERROR_INTR) && fs->state != do_transfer)
672 swim3_err("Non-transfer error interrupt: state=%d, dir=%x, intr=%x, err=%x\n",
673 fs->state, rq_data_dir(req), intr, err);
674 switch (fs->state) {
675 case locating:
676 if (intr & SEEN_SECTOR) {
677 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
678 out_8(&sw->select, RELAX);
679 out_8(&sw->intr_enable, 0);
680 del_timer(&fs->timeout);
681 fs->timeout_pending = 0;
682 if (sw->ctrack == 0xff) {
683 swim3_err("%s", "Seen sector but cyl=ff?\n");
684 fs->cur_cyl = -1;
685 if (fs->retries > 5) {
686 swim3_end_request(fs, BLK_STS_IOERR, 0);
687 fs->state = idle;
688 } else {
689 fs->state = jogging;
690 act(fs);
691 }
692 break;
693 }
694 fs->cur_cyl = sw->ctrack;
695 fs->cur_sector = sw->csect;
696 if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
697 swim3_err("Expected cyl %d, got %d\n",
698 fs->expect_cyl, fs->cur_cyl);
699 fs->state = do_transfer;
700 act(fs);
701 }
702 break;
703 case seeking:
704 case jogging:
705 if (sw->nseek == 0) {
706 out_8(&sw->control_bic, DO_SEEK);
707 out_8(&sw->select, RELAX);
708 out_8(&sw->intr_enable, 0);
709 del_timer(&fs->timeout);
710 fs->timeout_pending = 0;
711 if (fs->state == seeking)
712 ++fs->retries;
713 fs->state = settling;
714 act(fs);
715 }
716 break;
717 case settling:
718 out_8(&sw->intr_enable, 0);
719 del_timer(&fs->timeout);
720 fs->timeout_pending = 0;
721 act(fs);
722 break;
723 case do_transfer:
724 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
725 break;
726 out_8(&sw->intr_enable, 0);
727 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
728 out_8(&sw->select, RELAX);
729 del_timer(&fs->timeout);
730 fs->timeout_pending = 0;
731 dr = fs->dma;
732 cp = fs->dma_cmd;
733 if (rq_data_dir(req) == WRITE)
734 ++cp;
735 /*
736 * Check that the main data transfer has finished.
737 * On writing, the swim3 sometimes doesn't use
738 * up all the bytes of the postamble, so we can still
739 * see DMA active here. That doesn't matter as long
740 * as all the sector data has been transferred.
741 */
742 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
743 /* wait a little while for DMA to complete */
744 for (n = 0; n < 100; ++n) {
745 if (cp->xfer_status != 0)
746 break;
747 udelay(1);
748 barrier();
749 }
750 }
751 /* turn off DMA */
752 out_le32(&dr->control, (RUN | PAUSE) << 16);
753 stat = le16_to_cpu(cp->xfer_status);
754 resid = le16_to_cpu(cp->res_count);
755 if (intr & ERROR_INTR) {
756 n = fs->scount - 1 - resid / 512;
757 if (n > 0) {
758 blk_update_request(req, 0, n << 9);
759 fs->req_sector += n;
760 }
761 if (fs->retries < 5) {
762 ++fs->retries;
763 act(fs);
764 } else {
765 swim3_err("Error %sing block %ld (err=%x)\n",
766 rq_data_dir(req) == WRITE? "writ": "read",
767 (long)blk_rq_pos(req), err);
768 swim3_end_request(fs, BLK_STS_IOERR, 0);
769 fs->state = idle;
770 }
771 } else {
772 if ((stat & ACTIVE) == 0 || resid != 0) {
773 /* musta been an error */
774 swim3_err("fd dma error: stat=%x resid=%d\n", stat, resid);
775 swim3_err(" state=%d, dir=%x, intr=%x, err=%x\n",
776 fs->state, rq_data_dir(req), intr, err);
777 swim3_end_request(fs, BLK_STS_IOERR, 0);
778 fs->state = idle;
779 break;
780 }
781 fs->retries = 0;
782 if (swim3_end_request(fs, 0, fs->scount << 9)) {
783 fs->req_sector += fs->scount;
784 if (fs->req_sector > fs->secpertrack) {
785 fs->req_sector -= fs->secpertrack;
786 if (++fs->head > 1) {
787 fs->head = 0;
788 ++fs->req_cyl;
789 }
790 }
791 act(fs);
792 } else
793 fs->state = idle;
794 }
795 break;
796 default:
797 swim3_err("Don't know what to do in state %d\n", fs->state);
798 }
799 spin_unlock_irqrestore(&swim3_lock, flags);
800 return IRQ_HANDLED;
801 }
802
803 /*
804 static void fd_dma_interrupt(int irq, void *dev_id)
805 {
806 }
807 */
808
809 /* Called under the mutex to grab exclusive access to a drive */
810 static int grab_drive(struct floppy_state *fs, enum swim_state state,
811 int interruptible)
812 {
813 unsigned long flags;
814
815 swim3_dbg("%s", "-> grab drive\n");
816
817 spin_lock_irqsave(&swim3_lock, flags);
818 if (fs->state != idle && fs->state != available) {
819 ++fs->wanted;
820 /* this will enable irqs in order to sleep */
821 if (!interruptible)
822 wait_event_lock_irq(fs->wait,
823 fs->state == available,
824 swim3_lock);
825 else if (wait_event_interruptible_lock_irq(fs->wait,
826 fs->state == available,
827 swim3_lock)) {
828 --fs->wanted;
829 spin_unlock_irqrestore(&swim3_lock, flags);
830 return -EINTR;
831 }
832 --fs->wanted;
833 }
834 fs->state = state;
835 spin_unlock_irqrestore(&swim3_lock, flags);
836
837 return 0;
838 }
839
840 static void release_drive(struct floppy_state *fs)
841 {
842 struct request_queue *q = disks[fs->index]->queue;
843 unsigned long flags;
844
845 swim3_dbg("%s", "-> release drive\n");
846
847 spin_lock_irqsave(&swim3_lock, flags);
848 fs->state = idle;
849 spin_unlock_irqrestore(&swim3_lock, flags);
850
851 blk_mq_freeze_queue(q);
852 blk_mq_quiesce_queue(q);
853 blk_mq_unquiesce_queue(q);
854 blk_mq_unfreeze_queue(q);
855 }
856
857 static int fd_eject(struct floppy_state *fs)
858 {
859 int err, n;
860
861 err = grab_drive(fs, ejecting, 1);
862 if (err)
863 return err;
864 swim3_action(fs, EJECT);
865 for (n = 20; n > 0; --n) {
866 if (signal_pending(current)) {
867 err = -EINTR;
868 break;
869 }
870 swim3_select(fs, RELAX);
871 schedule_timeout_interruptible(1);
872 if (swim3_readbit(fs, DISK_IN) == 0)
873 break;
874 }
875 swim3_select(fs, RELAX);
876 udelay(150);
877 fs->ejected = 1;
878 release_drive(fs);
879 return err;
880 }
881
882 static struct floppy_struct floppy_type =
883 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL }; /* 7 1.44MB 3.5" */
884
885 static int floppy_locked_ioctl(struct block_device *bdev, blk_mode_t mode,
886 unsigned int cmd, unsigned long param)
887 {
888 struct floppy_state *fs = bdev->bd_disk->private_data;
889 int err;
890
891 if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
892 return -EPERM;
893
894 if (fs->mdev->media_bay &&
895 check_media_bay(fs->mdev->media_bay) != MB_FD)
896 return -ENXIO;
897
898 switch (cmd) {
899 case FDEJECT:
900 if (fs->ref_count != 1)
901 return -EBUSY;
902 err = fd_eject(fs);
903 return err;
904 case FDGETPRM:
905 if (copy_to_user((void __user *) param, &floppy_type,
906 sizeof(struct floppy_struct)))
907 return -EFAULT;
908 return 0;
909 }
910 return -ENOTTY;
911 }
912
913 static int floppy_ioctl(struct block_device *bdev, blk_mode_t mode,
914 unsigned int cmd, unsigned long param)
915 {
916 int ret;
917
918 mutex_lock(&swim3_mutex);
919 ret = floppy_locked_ioctl(bdev, mode, cmd, param);
920 mutex_unlock(&swim3_mutex);
921
922 return ret;
923 }
924
925 static int floppy_open(struct gendisk *disk, blk_mode_t mode)
926 {
927 struct floppy_state *fs = disk->private_data;
928 struct swim3 __iomem *sw = fs->swim3;
929 int n, err = 0;
930
931 if (fs->ref_count == 0) {
932 if (fs->mdev->media_bay &&
933 check_media_bay(fs->mdev->media_bay) != MB_FD)
934 return -ENXIO;
935 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
936 out_8(&sw->control_bic, 0xff);
937 out_8(&sw->mode, 0x95);
938 udelay(10);
939 out_8(&sw->intr_enable, 0);
940 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
941 swim3_action(fs, MOTOR_ON);
942 fs->write_prot = -1;
943 fs->cur_cyl = -1;
944 for (n = 0; n < 2 * HZ; ++n) {
945 if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
946 break;
947 if (signal_pending(current)) {
948 err = -EINTR;
949 break;
950 }
951 swim3_select(fs, RELAX);
952 schedule_timeout_interruptible(1);
953 }
954 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
955 || swim3_readbit(fs, DISK_IN) == 0))
956 err = -ENXIO;
957 swim3_action(fs, SETMFM);
958 swim3_select(fs, RELAX);
959
960 } else if (fs->ref_count == -1 || mode & BLK_OPEN_EXCL)
961 return -EBUSY;
962
963 if (err == 0 && !(mode & BLK_OPEN_NDELAY) &&
964 (mode & (BLK_OPEN_READ | BLK_OPEN_WRITE))) {
965 if (disk_check_media_change(disk))
966 floppy_revalidate(disk);
967 if (fs->ejected)
968 err = -ENXIO;
969 }
970
971 if (err == 0 && (mode & BLK_OPEN_WRITE)) {
972 if (fs->write_prot < 0)
973 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
974 if (fs->write_prot)
975 err = -EROFS;
976 }
977
978 if (err) {
979 if (fs->ref_count == 0) {
980 swim3_action(fs, MOTOR_OFF);
981 out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
982 swim3_select(fs, RELAX);
983 }
984 return err;
985 }
986
987 if (mode & BLK_OPEN_EXCL)
988 fs->ref_count = -1;
989 else
990 ++fs->ref_count;
991
992 return 0;
993 }
994
995 static int floppy_unlocked_open(struct gendisk *disk, blk_mode_t mode)
996 {
997 int ret;
998
999 mutex_lock(&swim3_mutex);
1000 ret = floppy_open(disk, mode);
1001 mutex_unlock(&swim3_mutex);
1002
1003 return ret;
1004 }
1005
1006 static void floppy_release(struct gendisk *disk)
1007 {
1008 struct floppy_state *fs = disk->private_data;
1009 struct swim3 __iomem *sw = fs->swim3;
1010
1011 mutex_lock(&swim3_mutex);
1012 if (fs->ref_count > 0)
1013 --fs->ref_count;
1014 else if (fs->ref_count == -1)
1015 fs->ref_count = 0;
1016 if (fs->ref_count == 0) {
1017 swim3_action(fs, MOTOR_OFF);
1018 out_8(&sw->control_bic, 0xff);
1019 swim3_select(fs, RELAX);
1020 }
1021 mutex_unlock(&swim3_mutex);
1022 }
1023
1024 static unsigned int floppy_check_events(struct gendisk *disk,
1025 unsigned int clearing)
1026 {
1027 struct floppy_state *fs = disk->private_data;
1028 return fs->ejected ? DISK_EVENT_MEDIA_CHANGE : 0;
1029 }
1030
1031 static int floppy_revalidate(struct gendisk *disk)
1032 {
1033 struct floppy_state *fs = disk->private_data;
1034 struct swim3 __iomem *sw;
1035 int ret, n;
1036
1037 if (fs->mdev->media_bay &&
1038 check_media_bay(fs->mdev->media_bay) != MB_FD)
1039 return -ENXIO;
1040
1041 sw = fs->swim3;
1042 grab_drive(fs, revalidating, 0);
1043 out_8(&sw->intr_enable, 0);
1044 out_8(&sw->control_bis, DRIVE_ENABLE);
1045 swim3_action(fs, MOTOR_ON); /* necessary? */
1046 fs->write_prot = -1;
1047 fs->cur_cyl = -1;
1048 mdelay(1);
1049 for (n = HZ; n > 0; --n) {
1050 if (swim3_readbit(fs, SEEK_COMPLETE))
1051 break;
1052 if (signal_pending(current))
1053 break;
1054 swim3_select(fs, RELAX);
1055 schedule_timeout_interruptible(1);
1056 }
1057 ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
1058 || swim3_readbit(fs, DISK_IN) == 0;
1059 if (ret)
1060 swim3_action(fs, MOTOR_OFF);
1061 else {
1062 fs->ejected = 0;
1063 swim3_action(fs, SETMFM);
1064 }
1065 swim3_select(fs, RELAX);
1066
1067 release_drive(fs);
1068 return ret;
1069 }
1070
1071 static const struct block_device_operations floppy_fops = {
1072 .open = floppy_unlocked_open,
1073 .release = floppy_release,
1074 .ioctl = floppy_ioctl,
1075 .check_events = floppy_check_events,
1076 };
1077
1078 static const struct blk_mq_ops swim3_mq_ops = {
1079 .queue_rq = swim3_queue_rq,
1080 };
1081
1082 static void swim3_mb_event(struct macio_dev* mdev, int mb_state)
1083 {
1084 struct floppy_state *fs = macio_get_drvdata(mdev);
1085 struct swim3 __iomem *sw;
1086
1087 if (!fs)
1088 return;
1089
1090 sw = fs->swim3;
1091
1092 if (mb_state != MB_FD)
1093 return;
1094
1095 /* Clear state */
1096 out_8(&sw->intr_enable, 0);
1097 in_8(&sw->intr);
1098 in_8(&sw->error);
1099 }
1100
1101 static int swim3_add_device(struct macio_dev *mdev, int index)
1102 {
1103 struct device_node *swim = mdev->ofdev.dev.of_node;
1104 struct floppy_state *fs = &floppy_states[index];
1105 int rc = -EBUSY;
1106
1107 fs->mdev = mdev;
1108 fs->index = index;
1109
1110 /* Check & Request resources */
1111 if (macio_resource_count(mdev) < 2) {
1112 swim3_err("%s", "No address in device-tree\n");
1113 return -ENXIO;
1114 }
1115 if (macio_irq_count(mdev) < 1) {
1116 swim3_err("%s", "No interrupt in device-tree\n");
1117 return -ENXIO;
1118 }
1119 if (macio_request_resource(mdev, 0, "swim3 (mmio)")) {
1120 swim3_err("%s", "Can't request mmio resource\n");
1121 return -EBUSY;
1122 }
1123 if (macio_request_resource(mdev, 1, "swim3 (dma)")) {
1124 swim3_err("%s", "Can't request dma resource\n");
1125 macio_release_resource(mdev, 0);
1126 return -EBUSY;
1127 }
1128 dev_set_drvdata(&mdev->ofdev.dev, fs);
1129
1130 if (mdev->media_bay == NULL)
1131 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1132
1133 fs->state = idle;
1134 fs->swim3 = (struct swim3 __iomem *)
1135 ioremap(macio_resource_start(mdev, 0), 0x200);
1136 if (fs->swim3 == NULL) {
1137 swim3_err("%s", "Couldn't map mmio registers\n");
1138 rc = -ENOMEM;
1139 goto out_release;
1140 }
1141 fs->dma = (struct dbdma_regs __iomem *)
1142 ioremap(macio_resource_start(mdev, 1), 0x200);
1143 if (fs->dma == NULL) {
1144 swim3_err("%s", "Couldn't map dma registers\n");
1145 iounmap(fs->swim3);
1146 rc = -ENOMEM;
1147 goto out_release;
1148 }
1149 fs->swim3_intr = macio_irq(mdev, 0);
1150 fs->dma_intr = macio_irq(mdev, 1);
1151 fs->cur_cyl = -1;
1152 fs->cur_sector = -1;
1153 fs->secpercyl = 36;
1154 fs->secpertrack = 18;
1155 fs->total_secs = 2880;
1156 init_waitqueue_head(&fs->wait);
1157
1158 fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1159 memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1160 fs->dma_cmd[1].command = cpu_to_le16(DBDMA_STOP);
1161
1162 if (mdev->media_bay == NULL || check_media_bay(mdev->media_bay) == MB_FD)
1163 swim3_mb_event(mdev, MB_FD);
1164
1165 if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1166 swim3_err("%s", "Couldn't request interrupt\n");
1167 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1168 goto out_unmap;
1169 }
1170
1171 timer_setup(&fs->timeout, NULL, 0);
1172
1173 swim3_info("SWIM3 floppy controller %s\n",
1174 mdev->media_bay ? "in media bay" : "");
1175
1176 return 0;
1177
1178 out_unmap:
1179 iounmap(fs->dma);
1180 iounmap(fs->swim3);
1181
1182 out_release:
1183 macio_release_resource(mdev, 0);
1184 macio_release_resource(mdev, 1);
1185
1186 return rc;
1187 }
1188
1189 static int swim3_attach(struct macio_dev *mdev,
1190 const struct of_device_id *match)
1191 {
1192 struct queue_limits lim = {
1193 .features = BLK_FEAT_ROTATIONAL,
1194 };
1195 struct floppy_state *fs;
1196 struct gendisk *disk;
1197 int rc;
1198
1199 if (floppy_count >= MAX_FLOPPIES)
1200 return -ENXIO;
1201
1202 if (floppy_count == 0) {
1203 rc = register_blkdev(FLOPPY_MAJOR, "fd");
1204 if (rc)
1205 return rc;
1206 }
1207
1208 fs = &floppy_states[floppy_count];
1209 memset(fs, 0, sizeof(*fs));
1210
1211 rc = blk_mq_alloc_sq_tag_set(&fs->tag_set, &swim3_mq_ops, 2,
1212 BLK_MQ_F_SHOULD_MERGE);
1213 if (rc)
1214 goto out_unregister;
1215
1216 disk = blk_mq_alloc_disk(&fs->tag_set, &lim, fs);
1217 if (IS_ERR(disk)) {
1218 rc = PTR_ERR(disk);
1219 goto out_free_tag_set;
1220 }
1221
1222 rc = swim3_add_device(mdev, floppy_count);
1223 if (rc)
1224 goto out_cleanup_disk;
1225
1226 disk->major = FLOPPY_MAJOR;
1227 disk->first_minor = floppy_count;
1228 disk->minors = 1;
1229 disk->fops = &floppy_fops;
1230 disk->private_data = fs;
1231 disk->events = DISK_EVENT_MEDIA_CHANGE;
1232 disk->flags |= GENHD_FL_REMOVABLE | GENHD_FL_NO_PART;
1233 sprintf(disk->disk_name, "fd%d", floppy_count);
1234 set_capacity(disk, 2880);
1235 rc = add_disk(disk);
1236 if (rc)
1237 goto out_cleanup_disk;
1238
1239 disks[floppy_count++] = disk;
1240 return 0;
1241
1242 out_cleanup_disk:
1243 put_disk(disk);
1244 out_free_tag_set:
1245 blk_mq_free_tag_set(&fs->tag_set);
1246 out_unregister:
1247 if (floppy_count == 0)
1248 unregister_blkdev(FLOPPY_MAJOR, "fd");
1249 return rc;
1250 }
1251
1252 static const struct of_device_id swim3_match[] =
1253 {
1254 {
1255 .name = "swim3",
1256 },
1257 {
1258 .compatible = "ohare-swim3"
1259 },
1260 {
1261 .compatible = "swim3"
1262 },
1263 { /* end of list */ }
1264 };
1265
1266 static struct macio_driver swim3_driver =
1267 {
1268 .driver = {
1269 .name = "swim3",
1270 .of_match_table = swim3_match,
1271 },
1272 .probe = swim3_attach,
1273 #ifdef CONFIG_PMAC_MEDIABAY
1274 .mediabay_event = swim3_mb_event,
1275 #endif
1276 #if 0
1277 .suspend = swim3_suspend,
1278 .resume = swim3_resume,
1279 #endif
1280 };
1281
1282
1283 static int swim3_init(void)
1284 {
1285 macio_register_driver(&swim3_driver);
1286 return 0;
1287 }
1288
1289 module_init(swim3_init)
1290
1291 MODULE_LICENSE("GPL");
1292 MODULE_AUTHOR("Paul Mackerras");
1293 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);
Linux Kernel