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Linux 2.6.17.7
[linux/fpc-iii.git] / drivers / block / swim3.c
blob01f042f6f1c42874e9090ce60f0e925d7b73726c
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/config.h>
20 #include <linux/stddef.h>
21 #include <linux/kernel.h>
22 #include <linux/sched.h>
23 #include <linux/timer.h>
24 #include <linux/delay.h>
25 #include <linux/fd.h>
26 #include <linux/ioctl.h>
27 #include <linux/blkdev.h>
28 #include <linux/devfs_fs_kernel.h>
29 #include <linux/interrupt.h>
30 #include <linux/module.h>
31 #include <linux/spinlock.h>
32 #include <asm/io.h>
33 #include <asm/dbdma.h>
34 #include <asm/prom.h>
35 #include <asm/uaccess.h>
36 #include <asm/mediabay.h>
37 #include <asm/machdep.h>
38 #include <asm/pmac_feature.h>
39
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 device_node* media_bay; /* NULL when not in bay */
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(request_queue_t * 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, struct pt_regs *regs);
244 /*static void fd_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs);*/
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 inode *inode, struct file *filp,
250 unsigned int cmd, unsigned long param);
251 static int floppy_open(struct inode *inode, struct file *filp);
252 static int floppy_release(struct inode *inode, struct file *filp);
253 static int floppy_check_change(struct gendisk *disk);
254 static int floppy_revalidate(struct gendisk *disk);
255 static int swim3_add_device(struct device_node *swims);
256 int swim3_init(void);
257
258 #ifndef CONFIG_PMAC_MEDIABAY
259 #define check_media_bay(which, what) 1
260 #endif
261
262 static void swim3_select(struct floppy_state *fs, int sel)
263 {
264 struct swim3 __iomem *sw = fs->swim3;
265
266 out_8(&sw->select, RELAX);
267 if (sel & 8)
268 out_8(&sw->control_bis, SELECT);
269 else
270 out_8(&sw->control_bic, SELECT);
271 out_8(&sw->select, sel & CA_MASK);
272 }
273
274 static void swim3_action(struct floppy_state *fs, int action)
275 {
276 struct swim3 __iomem *sw = fs->swim3;
277
278 swim3_select(fs, action);
279 udelay(1);
280 out_8(&sw->select, sw->select | LSTRB);
281 udelay(2);
282 out_8(&sw->select, sw->select & ~LSTRB);
283 udelay(1);
284 }
285
286 static int swim3_readbit(struct floppy_state *fs, int bit)
287 {
288 struct swim3 __iomem *sw = fs->swim3;
289 int stat;
290
291 swim3_select(fs, bit);
292 udelay(1);
293 stat = in_8(&sw->status);
294 return (stat & DATA) == 0;
295 }
296
297 static void do_fd_request(request_queue_t * q)
298 {
299 int i;
300 for(i=0;i<floppy_count;i++)
301 {
302 #ifdef CONFIG_PMAC_MEDIABAY
303 if (floppy_states[i].media_bay &&
304 check_media_bay(floppy_states[i].media_bay, MB_FD))
305 continue;
306 #endif /* CONFIG_PMAC_MEDIABAY */
307 start_request(&floppy_states[i]);
308 }
309 }
310
311 static void start_request(struct floppy_state *fs)
312 {
313 struct request *req;
314 unsigned long x;
315
316 if (fs->state == idle && fs->wanted) {
317 fs->state = available;
318 wake_up(&fs->wait);
319 return;
320 }
321 while (fs->state == idle && (req = elv_next_request(swim3_queue))) {
322 #if 0
323 printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%ld buf=%p\n",
324 req->rq_disk->disk_name, req->cmd,
325 (long)req->sector, req->nr_sectors, req->buffer);
326 printk(" rq_status=%d errors=%d current_nr_sectors=%ld\n",
327 req->rq_status, req->errors, req->current_nr_sectors);
328 #endif
329
330 if (req->sector < 0 || req->sector >= fs->total_secs) {
331 end_request(req, 0);
332 continue;
333 }
334 if (req->current_nr_sectors == 0) {
335 end_request(req, 1);
336 continue;
337 }
338 if (fs->ejected) {
339 end_request(req, 0);
340 continue;
341 }
342
343 if (rq_data_dir(req) == WRITE) {
344 if (fs->write_prot < 0)
345 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
346 if (fs->write_prot) {
347 end_request(req, 0);
348 continue;
349 }
350 }
351
352 /* Do not remove the cast. req->sector is now a sector_t and
353 * can be 64 bits, but it will never go past 32 bits for this
354 * driver anyway, so we can safely cast it down and not have
355 * to do a 64/32 division
356 */
357 fs->req_cyl = ((long)req->sector) / fs->secpercyl;
358 x = ((long)req->sector) % fs->secpercyl;
359 fs->head = x / fs->secpertrack;
360 fs->req_sector = x % fs->secpertrack + 1;
361 fd_req = req;
362 fs->state = do_transfer;
363 fs->retries = 0;
364
365 act(fs);
366 }
367 }
368
369 static void set_timeout(struct floppy_state *fs, int nticks,
370 void (*proc)(unsigned long))
371 {
372 unsigned long flags;
373
374 spin_lock_irqsave(&fs->lock, flags);
375 if (fs->timeout_pending)
376 del_timer(&fs->timeout);
377 fs->timeout.expires = jiffies + nticks;
378 fs->timeout.function = proc;
379 fs->timeout.data = (unsigned long) fs;
380 add_timer(&fs->timeout);
381 fs->timeout_pending = 1;
382 spin_unlock_irqrestore(&fs->lock, flags);
383 }
384
385 static inline void scan_track(struct floppy_state *fs)
386 {
387 struct swim3 __iomem *sw = fs->swim3;
388
389 swim3_select(fs, READ_DATA_0);
390 in_8(&sw->intr); /* clear SEEN_SECTOR bit */
391 in_8(&sw->error);
392 out_8(&sw->intr_enable, SEEN_SECTOR);
393 out_8(&sw->control_bis, DO_ACTION);
394 /* enable intr when track found */
395 set_timeout(fs, HZ, scan_timeout); /* enable timeout */
396 }
397
398 static inline void seek_track(struct floppy_state *fs, int n)
399 {
400 struct swim3 __iomem *sw = fs->swim3;
401
402 if (n >= 0) {
403 swim3_action(fs, SEEK_POSITIVE);
404 sw->nseek = n;
405 } else {
406 swim3_action(fs, SEEK_NEGATIVE);
407 sw->nseek = -n;
408 }
409 fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
410 swim3_select(fs, STEP);
411 in_8(&sw->error);
412 /* enable intr when seek finished */
413 out_8(&sw->intr_enable, SEEK_DONE);
414 out_8(&sw->control_bis, DO_SEEK);
415 set_timeout(fs, 3*HZ, seek_timeout); /* enable timeout */
416 fs->settle_time = 0;
417 }
418
419 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
420 void *buf, int count)
421 {
422 st_le16(&cp->req_count, count);
423 st_le16(&cp->command, cmd);
424 st_le32(&cp->phy_addr, virt_to_bus(buf));
425 cp->xfer_status = 0;
426 }
427
428 static inline void setup_transfer(struct floppy_state *fs)
429 {
430 int n;
431 struct swim3 __iomem *sw = fs->swim3;
432 struct dbdma_cmd *cp = fs->dma_cmd;
433 struct dbdma_regs __iomem *dr = fs->dma;
434
435 if (fd_req->current_nr_sectors <= 0) {
436 printk(KERN_ERR "swim3: transfer 0 sectors?\n");
437 return;
438 }
439 if (rq_data_dir(fd_req) == WRITE)
440 n = 1;
441 else {
442 n = fs->secpertrack - fs->req_sector + 1;
443 if (n > fd_req->current_nr_sectors)
444 n = fd_req->current_nr_sectors;
445 }
446 fs->scount = n;
447 swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
448 out_8(&sw->sector, fs->req_sector);
449 out_8(&sw->nsect, n);
450 out_8(&sw->gap3, 0);
451 out_le32(&dr->cmdptr, virt_to_bus(cp));
452 if (rq_data_dir(fd_req) == WRITE) {
453 /* Set up 3 dma commands: write preamble, data, postamble */
454 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
455 ++cp;
456 init_dma(cp, OUTPUT_MORE, fd_req->buffer, 512);
457 ++cp;
458 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
459 } else {
460 init_dma(cp, INPUT_LAST, fd_req->buffer, n * 512);
461 }
462 ++cp;
463 out_le16(&cp->command, DBDMA_STOP);
464 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
465 in_8(&sw->error);
466 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
467 if (rq_data_dir(fd_req) == WRITE)
468 out_8(&sw->control_bis, WRITE_SECTORS);
469 in_8(&sw->intr);
470 out_le32(&dr->control, (RUN << 16) | RUN);
471 /* enable intr when transfer complete */
472 out_8(&sw->intr_enable, TRANSFER_DONE);
473 out_8(&sw->control_bis, DO_ACTION);
474 set_timeout(fs, 2*HZ, xfer_timeout); /* enable timeout */
475 }
476
477 static void act(struct floppy_state *fs)
478 {
479 for (;;) {
480 switch (fs->state) {
481 case idle:
482 return; /* XXX shouldn't get here */
483
484 case locating:
485 if (swim3_readbit(fs, TRACK_ZERO)) {
486 fs->cur_cyl = 0;
487 if (fs->req_cyl == 0)
488 fs->state = do_transfer;
489 else
490 fs->state = seeking;
491 break;
492 }
493 scan_track(fs);
494 return;
495
496 case seeking:
497 if (fs->cur_cyl < 0) {
498 fs->expect_cyl = -1;
499 fs->state = locating;
500 break;
501 }
502 if (fs->req_cyl == fs->cur_cyl) {
503 printk("whoops, seeking 0\n");
504 fs->state = do_transfer;
505 break;
506 }
507 seek_track(fs, fs->req_cyl - fs->cur_cyl);
508 return;
509
510 case settling:
511 /* check for SEEK_COMPLETE after 30ms */
512 fs->settle_time = (HZ + 32) / 33;
513 set_timeout(fs, fs->settle_time, settle_timeout);
514 return;
515
516 case do_transfer:
517 if (fs->cur_cyl != fs->req_cyl) {
518 if (fs->retries > 5) {
519 end_request(fd_req, 0);
520 fs->state = idle;
521 return;
522 }
523 fs->state = seeking;
524 break;
525 }
526 setup_transfer(fs);
527 return;
528
529 case jogging:
530 seek_track(fs, -5);
531 return;
532
533 default:
534 printk(KERN_ERR"swim3: unknown state %d\n", fs->state);
535 return;
536 }
537 }
538 }
539
540 static void scan_timeout(unsigned long data)
541 {
542 struct floppy_state *fs = (struct floppy_state *) data;
543 struct swim3 __iomem *sw = fs->swim3;
544
545 fs->timeout_pending = 0;
546 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
547 out_8(&sw->select, RELAX);
548 out_8(&sw->intr_enable, 0);
549 fs->cur_cyl = -1;
550 if (fs->retries > 5) {
551 end_request(fd_req, 0);
552 fs->state = idle;
553 start_request(fs);
554 } else {
555 fs->state = jogging;
556 act(fs);
557 }
558 }
559
560 static void seek_timeout(unsigned long data)
561 {
562 struct floppy_state *fs = (struct floppy_state *) data;
563 struct swim3 __iomem *sw = fs->swim3;
564
565 fs->timeout_pending = 0;
566 out_8(&sw->control_bic, DO_SEEK);
567 out_8(&sw->select, RELAX);
568 out_8(&sw->intr_enable, 0);
569 printk(KERN_ERR "swim3: seek timeout\n");
570 end_request(fd_req, 0);
571 fs->state = idle;
572 start_request(fs);
573 }
574
575 static void settle_timeout(unsigned long data)
576 {
577 struct floppy_state *fs = (struct floppy_state *) data;
578 struct swim3 __iomem *sw = fs->swim3;
579
580 fs->timeout_pending = 0;
581 if (swim3_readbit(fs, SEEK_COMPLETE)) {
582 out_8(&sw->select, RELAX);
583 fs->state = locating;
584 act(fs);
585 return;
586 }
587 out_8(&sw->select, RELAX);
588 if (fs->settle_time < 2*HZ) {
589 ++fs->settle_time;
590 set_timeout(fs, 1, settle_timeout);
591 return;
592 }
593 printk(KERN_ERR "swim3: seek settle timeout\n");
594 end_request(fd_req, 0);
595 fs->state = idle;
596 start_request(fs);
597 }
598
599 static void xfer_timeout(unsigned long data)
600 {
601 struct floppy_state *fs = (struct floppy_state *) data;
602 struct swim3 __iomem *sw = fs->swim3;
603 struct dbdma_regs __iomem *dr = fs->dma;
604 struct dbdma_cmd *cp = fs->dma_cmd;
605 unsigned long s;
606 int n;
607
608 fs->timeout_pending = 0;
609 out_le32(&dr->control, RUN << 16);
610 /* We must wait a bit for dbdma to stop */
611 for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
612 udelay(1);
613 out_8(&sw->intr_enable, 0);
614 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
615 out_8(&sw->select, RELAX);
616 if (rq_data_dir(fd_req) == WRITE)
617 ++cp;
618 if (ld_le16(&cp->xfer_status) != 0)
619 s = fs->scount - ((ld_le16(&cp->res_count) + 511) >> 9);
620 else
621 s = 0;
622 fd_req->sector += s;
623 fd_req->current_nr_sectors -= s;
624 printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
625 (rq_data_dir(fd_req)==WRITE? "writ": "read"), (long)fd_req->sector);
626 end_request(fd_req, 0);
627 fs->state = idle;
628 start_request(fs);
629 }
630
631 static irqreturn_t swim3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
632 {
633 struct floppy_state *fs = (struct floppy_state *) dev_id;
634 struct swim3 __iomem *sw = fs->swim3;
635 int intr, err, n;
636 int stat, resid;
637 struct dbdma_regs __iomem *dr;
638 struct dbdma_cmd *cp;
639
640 intr = in_8(&sw->intr);
641 err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
642 if ((intr & ERROR_INTR) && fs->state != do_transfer)
643 printk(KERN_ERR "swim3_interrupt, state=%d, dir=%lx, intr=%x, err=%x\n",
644 fs->state, rq_data_dir(fd_req), intr, err);
645 switch (fs->state) {
646 case locating:
647 if (intr & SEEN_SECTOR) {
648 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
649 out_8(&sw->select, RELAX);
650 out_8(&sw->intr_enable, 0);
651 del_timer(&fs->timeout);
652 fs->timeout_pending = 0;
653 if (sw->ctrack == 0xff) {
654 printk(KERN_ERR "swim3: seen sector but cyl=ff?\n");
655 fs->cur_cyl = -1;
656 if (fs->retries > 5) {
657 end_request(fd_req, 0);
658 fs->state = idle;
659 start_request(fs);
660 } else {
661 fs->state = jogging;
662 act(fs);
663 }
664 break;
665 }
666 fs->cur_cyl = sw->ctrack;
667 fs->cur_sector = sw->csect;
668 if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
669 printk(KERN_ERR "swim3: expected cyl %d, got %d\n",
670 fs->expect_cyl, fs->cur_cyl);
671 fs->state = do_transfer;
672 act(fs);
673 }
674 break;
675 case seeking:
676 case jogging:
677 if (sw->nseek == 0) {
678 out_8(&sw->control_bic, DO_SEEK);
679 out_8(&sw->select, RELAX);
680 out_8(&sw->intr_enable, 0);
681 del_timer(&fs->timeout);
682 fs->timeout_pending = 0;
683 if (fs->state == seeking)
684 ++fs->retries;
685 fs->state = settling;
686 act(fs);
687 }
688 break;
689 case settling:
690 out_8(&sw->intr_enable, 0);
691 del_timer(&fs->timeout);
692 fs->timeout_pending = 0;
693 act(fs);
694 break;
695 case do_transfer:
696 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
697 break;
698 out_8(&sw->intr_enable, 0);
699 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
700 out_8(&sw->select, RELAX);
701 del_timer(&fs->timeout);
702 fs->timeout_pending = 0;
703 dr = fs->dma;
704 cp = fs->dma_cmd;
705 if (rq_data_dir(fd_req) == WRITE)
706 ++cp;
707 /*
708 * Check that the main data transfer has finished.
709 * On writing, the swim3 sometimes doesn't use
710 * up all the bytes of the postamble, so we can still
711 * see DMA active here. That doesn't matter as long
712 * as all the sector data has been transferred.
713 */
714 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
715 /* wait a little while for DMA to complete */
716 for (n = 0; n < 100; ++n) {
717 if (cp->xfer_status != 0)
718 break;
719 udelay(1);
720 barrier();
721 }
722 }
723 /* turn off DMA */
724 out_le32(&dr->control, (RUN | PAUSE) << 16);
725 stat = ld_le16(&cp->xfer_status);
726 resid = ld_le16(&cp->res_count);
727 if (intr & ERROR_INTR) {
728 n = fs->scount - 1 - resid / 512;
729 if (n > 0) {
730 fd_req->sector += n;
731 fd_req->current_nr_sectors -= n;
732 fd_req->buffer += n * 512;
733 fs->req_sector += n;
734 }
735 if (fs->retries < 5) {
736 ++fs->retries;
737 act(fs);
738 } else {
739 printk("swim3: error %sing block %ld (err=%x)\n",
740 rq_data_dir(fd_req) == WRITE? "writ": "read",
741 (long)fd_req->sector, err);
742 end_request(fd_req, 0);
743 fs->state = idle;
744 }
745 } else {
746 if ((stat & ACTIVE) == 0 || resid != 0) {
747 /* musta been an error */
748 printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid);
749 printk(KERN_ERR " state=%d, dir=%lx, intr=%x, err=%x\n",
750 fs->state, rq_data_dir(fd_req), intr, err);
751 end_request(fd_req, 0);
752 fs->state = idle;
753 start_request(fs);
754 break;
755 }
756 fd_req->sector += fs->scount;
757 fd_req->current_nr_sectors -= fs->scount;
758 fd_req->buffer += fs->scount * 512;
759 if (fd_req->current_nr_sectors <= 0) {
760 end_request(fd_req, 1);
761 fs->state = idle;
762 } else {
763 fs->req_sector += fs->scount;
764 if (fs->req_sector > fs->secpertrack) {
765 fs->req_sector -= fs->secpertrack;
766 if (++fs->head > 1) {
767 fs->head = 0;
768 ++fs->req_cyl;
769 }
770 }
771 act(fs);
772 }
773 }
774 if (fs->state == idle)
775 start_request(fs);
776 break;
777 default:
778 printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state);
779 }
780 return IRQ_HANDLED;
781 }
782
783 /*
784 static void fd_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs)
785 {
786 }
787 */
788
789 static int grab_drive(struct floppy_state *fs, enum swim_state state,
790 int interruptible)
791 {
792 unsigned long flags;
793
794 spin_lock_irqsave(&fs->lock, flags);
795 if (fs->state != idle) {
796 ++fs->wanted;
797 while (fs->state != available) {
798 if (interruptible && signal_pending(current)) {
799 --fs->wanted;
800 spin_unlock_irqrestore(&fs->lock, flags);
801 return -EINTR;
802 }
803 interruptible_sleep_on(&fs->wait);
804 }
805 --fs->wanted;
806 }
807 fs->state = state;
808 spin_unlock_irqrestore(&fs->lock, flags);
809 return 0;
810 }
811
812 static void release_drive(struct floppy_state *fs)
813 {
814 unsigned long flags;
815
816 spin_lock_irqsave(&fs->lock, flags);
817 fs->state = idle;
818 start_request(fs);
819 spin_unlock_irqrestore(&fs->lock, flags);
820 }
821
822 static int fd_eject(struct floppy_state *fs)
823 {
824 int err, n;
825
826 err = grab_drive(fs, ejecting, 1);
827 if (err)
828 return err;
829 swim3_action(fs, EJECT);
830 for (n = 20; n > 0; --n) {
831 if (signal_pending(current)) {
832 err = -EINTR;
833 break;
834 }
835 swim3_select(fs, RELAX);
836 schedule_timeout_interruptible(1);
837 if (swim3_readbit(fs, DISK_IN) == 0)
838 break;
839 }
840 swim3_select(fs, RELAX);
841 udelay(150);
842 fs->ejected = 1;
843 release_drive(fs);
844 return err;
845 }
846
847 static struct floppy_struct floppy_type =
848 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL }; /* 7 1.44MB 3.5" */
849
850 static int floppy_ioctl(struct inode *inode, struct file *filp,
851 unsigned int cmd, unsigned long param)
852 {
853 struct floppy_state *fs = inode->i_bdev->bd_disk->private_data;
854 int err;
855
856 if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
857 return -EPERM;
858
859 #ifdef CONFIG_PMAC_MEDIABAY
860 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
861 return -ENXIO;
862 #endif
863
864 switch (cmd) {
865 case FDEJECT:
866 if (fs->ref_count != 1)
867 return -EBUSY;
868 err = fd_eject(fs);
869 return err;
870 case FDGETPRM:
871 if (copy_to_user((void __user *) param, &floppy_type,
872 sizeof(struct floppy_struct)))
873 return -EFAULT;
874 return 0;
875 }
876 return -ENOTTY;
877 }
878
879 static int floppy_open(struct inode *inode, struct file *filp)
880 {
881 struct floppy_state *fs = inode->i_bdev->bd_disk->private_data;
882 struct swim3 __iomem *sw = fs->swim3;
883 int n, err = 0;
884
885 if (fs->ref_count == 0) {
886 #ifdef CONFIG_PMAC_MEDIABAY
887 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
888 return -ENXIO;
889 #endif
890 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
891 out_8(&sw->control_bic, 0xff);
892 out_8(&sw->mode, 0x95);
893 udelay(10);
894 out_8(&sw->intr_enable, 0);
895 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
896 swim3_action(fs, MOTOR_ON);
897 fs->write_prot = -1;
898 fs->cur_cyl = -1;
899 for (n = 0; n < 2 * HZ; ++n) {
900 if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
901 break;
902 if (signal_pending(current)) {
903 err = -EINTR;
904 break;
905 }
906 swim3_select(fs, RELAX);
907 schedule_timeout_interruptible(1);
908 }
909 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
910 || swim3_readbit(fs, DISK_IN) == 0))
911 err = -ENXIO;
912 swim3_action(fs, SETMFM);
913 swim3_select(fs, RELAX);
914
915 } else if (fs->ref_count == -1 || filp->f_flags & O_EXCL)
916 return -EBUSY;
917
918 if (err == 0 && (filp->f_flags & O_NDELAY) == 0
919 && (filp->f_mode & 3)) {
920 check_disk_change(inode->i_bdev);
921 if (fs->ejected)
922 err = -ENXIO;
923 }
924
925 if (err == 0 && (filp->f_mode & 2)) {
926 if (fs->write_prot < 0)
927 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
928 if (fs->write_prot)
929 err = -EROFS;
930 }
931
932 if (err) {
933 if (fs->ref_count == 0) {
934 swim3_action(fs, MOTOR_OFF);
935 out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
936 swim3_select(fs, RELAX);
937 }
938 return err;
939 }
940
941 if (filp->f_flags & O_EXCL)
942 fs->ref_count = -1;
943 else
944 ++fs->ref_count;
945
946 return 0;
947 }
948
949 static int floppy_release(struct inode *inode, struct file *filp)
950 {
951 struct floppy_state *fs = inode->i_bdev->bd_disk->private_data;
952 struct swim3 __iomem *sw = fs->swim3;
953 if (fs->ref_count > 0 && --fs->ref_count == 0) {
954 swim3_action(fs, MOTOR_OFF);
955 out_8(&sw->control_bic, 0xff);
956 swim3_select(fs, RELAX);
957 }
958 return 0;
959 }
960
961 static int floppy_check_change(struct gendisk *disk)
962 {
963 struct floppy_state *fs = disk->private_data;
964 return fs->ejected;
965 }
966
967 static int floppy_revalidate(struct gendisk *disk)
968 {
969 struct floppy_state *fs = disk->private_data;
970 struct swim3 __iomem *sw;
971 int ret, n;
972
973 #ifdef CONFIG_PMAC_MEDIABAY
974 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
975 return -ENXIO;
976 #endif
977
978 sw = fs->swim3;
979 grab_drive(fs, revalidating, 0);
980 out_8(&sw->intr_enable, 0);
981 out_8(&sw->control_bis, DRIVE_ENABLE);
982 swim3_action(fs, MOTOR_ON); /* necessary? */
983 fs->write_prot = -1;
984 fs->cur_cyl = -1;
985 mdelay(1);
986 for (n = HZ; n > 0; --n) {
987 if (swim3_readbit(fs, SEEK_COMPLETE))
988 break;
989 if (signal_pending(current))
990 break;
991 swim3_select(fs, RELAX);
992 schedule_timeout_interruptible(1);
993 }
994 ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
995 || swim3_readbit(fs, DISK_IN) == 0;
996 if (ret)
997 swim3_action(fs, MOTOR_OFF);
998 else {
999 fs->ejected = 0;
1000 swim3_action(fs, SETMFM);
1001 }
1002 swim3_select(fs, RELAX);
1003
1004 release_drive(fs);
1005 return ret;
1006 }
1007
1008 static struct block_device_operations floppy_fops = {
1009 .open = floppy_open,
1010 .release = floppy_release,
1011 .ioctl = floppy_ioctl,
1012 .media_changed = floppy_check_change,
1013 .revalidate_disk= floppy_revalidate,
1014 };
1015
1016 int swim3_init(void)
1017 {
1018 struct device_node *swim;
1019 int err = -ENOMEM;
1020 int i;
1021
1022 devfs_mk_dir("floppy");
1023
1024 swim = find_devices("floppy");
1025 while (swim && (floppy_count < MAX_FLOPPIES))
1026 {
1027 swim3_add_device(swim);
1028 swim = swim->next;
1029 }
1030
1031 swim = find_devices("swim3");
1032 while (swim && (floppy_count < MAX_FLOPPIES))
1033 {
1034 swim3_add_device(swim);
1035 swim = swim->next;
1036 }
1037
1038 if (!floppy_count)
1039 return -ENODEV;
1040
1041 for (i = 0; i < floppy_count; i++) {
1042 disks[i] = alloc_disk(1);
1043 if (!disks[i])
1044 goto out;
1045 }
1046
1047 if (register_blkdev(FLOPPY_MAJOR, "fd")) {
1048 err = -EBUSY;
1049 goto out;
1050 }
1051
1052 swim3_queue = blk_init_queue(do_fd_request, &swim3_lock);
1053 if (!swim3_queue) {
1054 err = -ENOMEM;
1055 goto out_queue;
1056 }
1057
1058 for (i = 0; i < floppy_count; i++) {
1059 struct gendisk *disk = disks[i];
1060 disk->major = FLOPPY_MAJOR;
1061 disk->first_minor = i;
1062 disk->fops = &floppy_fops;
1063 disk->private_data = &floppy_states[i];
1064 disk->queue = swim3_queue;
1065 disk->flags |= GENHD_FL_REMOVABLE;
1066 sprintf(disk->disk_name, "fd%d", i);
1067 sprintf(disk->devfs_name, "floppy/%d", i);
1068 set_capacity(disk, 2880);
1069 add_disk(disk);
1070 }
1071 return 0;
1072
1073 out_queue:
1074 unregister_blkdev(FLOPPY_MAJOR, "fd");
1075 out:
1076 while (i--)
1077 put_disk(disks[i]);
1078 /* shouldn't we do something with results of swim_add_device()? */
1079 return err;
1080 }
1081
1082 static int swim3_add_device(struct device_node *swim)
1083 {
1084 struct device_node *mediabay;
1085 struct floppy_state *fs = &floppy_states[floppy_count];
1086 struct resource res_reg, res_dma;
1087
1088 if (of_address_to_resource(swim, 0, &res_reg) ||
1089 of_address_to_resource(swim, 1, &res_dma)) {
1090 printk(KERN_ERR "swim3: Can't get addresses\n");
1091 return -EINVAL;
1092 }
1093 if (request_mem_region(res_reg.start, res_reg.end - res_reg.start + 1,
1094 " (reg)") == NULL) {
1095 printk(KERN_ERR "swim3: Can't request register space\n");
1096 return -EINVAL;
1097 }
1098 if (request_mem_region(res_dma.start, res_dma.end - res_dma.start + 1,
1099 " (dma)") == NULL) {
1100 release_mem_region(res_reg.start,
1101 res_reg.end - res_reg.start + 1);
1102 printk(KERN_ERR "swim3: Can't request DMA space\n");
1103 return -EINVAL;
1104 }
1105
1106 if (swim->n_intrs < 2) {
1107 printk(KERN_INFO "swim3: expecting 2 intrs (n_intrs:%d)\n",
1108 swim->n_intrs);
1109 release_mem_region(res_reg.start,
1110 res_reg.end - res_reg.start + 1);
1111 release_mem_region(res_dma.start,
1112 res_dma.end - res_dma.start + 1);
1113 return -EINVAL;
1114 }
1115
1116 mediabay = (strcasecmp(swim->parent->type, "media-bay") == 0) ? swim->parent : NULL;
1117 if (mediabay == NULL)
1118 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1119
1120 memset(fs, 0, sizeof(*fs));
1121 spin_lock_init(&fs->lock);
1122 fs->state = idle;
1123 fs->swim3 = (struct swim3 __iomem *)ioremap(res_reg.start, 0x200);
1124 fs->dma = (struct dbdma_regs __iomem *)ioremap(res_dma.start, 0x200);
1125 fs->swim3_intr = swim->intrs[0].line;
1126 fs->dma_intr = swim->intrs[1].line;
1127 fs->cur_cyl = -1;
1128 fs->cur_sector = -1;
1129 fs->secpercyl = 36;
1130 fs->secpertrack = 18;
1131 fs->total_secs = 2880;
1132 fs->media_bay = mediabay;
1133 init_waitqueue_head(&fs->wait);
1134
1135 fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1136 memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1137 st_le16(&fs->dma_cmd[1].command, DBDMA_STOP);
1138
1139 if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1140 printk(KERN_ERR "Couldn't get irq %d for SWIM3\n", fs->swim3_intr);
1141 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1142 return -EBUSY;
1143 }
1144 /*
1145 if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) {
1146 printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA",
1147 fs->dma_intr);
1148 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1149 return -EBUSY;
1150 }
1151 */
1152
1153 init_timer(&fs->timeout);
1154
1155 printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count,
1156 mediabay ? "in media bay" : "");
1157
1158 floppy_count++;
1159
1160 return 0;
1161 }
1162
1163 module_init(swim3_init)
1164
1165 MODULE_LICENSE("GPL");
1166 MODULE_AUTHOR("Paul Mackerras");
1167 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);
Linux with added FPC-III support