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[TG3]: Set minimal hw interrupt mitigation.
[linux-2.6/verdex.git] / drivers / block / swim3.c
blob5b09cf154ac7f3d9f29e1569952f53bebdd2cb71
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 <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 struct request_queue *swim3_queue;
40 static struct gendisk *disks[2];
41 static struct request *fd_req;
42
43 #define MAX_FLOPPIES 2
44
45 enum swim_state {
46 idle,
47 locating,
48 seeking,
49 settling,
50 do_transfer,
51 jogging,
52 available,
53 revalidating,
54 ejecting
55 };
56
57 #define REG(x) unsigned char x; char x ## _pad[15];
58
59 /*
60 * The names for these registers mostly represent speculation on my part.
61 * It will be interesting to see how close they are to the names Apple uses.
62 */
63 struct swim3 {
64 REG(data);
65 REG(timer); /* counts down at 1MHz */
66 REG(error);
67 REG(mode);
68 REG(select); /* controls CA0, CA1, CA2 and LSTRB signals */
69 REG(setup);
70 REG(control); /* writing bits clears them */
71 REG(status); /* writing bits sets them in control */
72 REG(intr);
73 REG(nseek); /* # tracks to seek */
74 REG(ctrack); /* current track number */
75 REG(csect); /* current sector number */
76 REG(gap3); /* size of gap 3 in track format */
77 REG(sector); /* sector # to read or write */
78 REG(nsect); /* # sectors to read or write */
79 REG(intr_enable);
80 };
81
82 #define control_bic control
83 #define control_bis status
84
85 /* Bits in select register */
86 #define CA_MASK 7
87 #define LSTRB 8
88
89 /* Bits in control register */
90 #define DO_SEEK 0x80
91 #define FORMAT 0x40
92 #define SELECT 0x20
93 #define WRITE_SECTORS 0x10
94 #define DO_ACTION 0x08
95 #define DRIVE2_ENABLE 0x04
96 #define DRIVE_ENABLE 0x02
97 #define INTR_ENABLE 0x01
98
99 /* Bits in status register */
100 #define FIFO_1BYTE 0x80
101 #define FIFO_2BYTE 0x40
102 #define ERROR 0x20
103 #define DATA 0x08
104 #define RDDATA 0x04
105 #define INTR_PENDING 0x02
106 #define MARK_BYTE 0x01
107
108 /* Bits in intr and intr_enable registers */
109 #define ERROR_INTR 0x20
110 #define DATA_CHANGED 0x10
111 #define TRANSFER_DONE 0x08
112 #define SEEN_SECTOR 0x04
113 #define SEEK_DONE 0x02
114 #define TIMER_DONE 0x01
115
116 /* Bits in error register */
117 #define ERR_DATA_CRC 0x80
118 #define ERR_ADDR_CRC 0x40
119 #define ERR_OVERRUN 0x04
120 #define ERR_UNDERRUN 0x01
121
122 /* Bits in setup register */
123 #define S_SW_RESET 0x80
124 #define S_GCR_WRITE 0x40
125 #define S_IBM_DRIVE 0x20
126 #define S_TEST_MODE 0x10
127 #define S_FCLK_DIV2 0x08
128 #define S_GCR 0x04
129 #define S_COPY_PROT 0x02
130 #define S_INV_WDATA 0x01
131
132 /* Select values for swim3_action */
133 #define SEEK_POSITIVE 0
134 #define SEEK_NEGATIVE 4
135 #define STEP 1
136 #define MOTOR_ON 2
137 #define MOTOR_OFF 6
138 #define INDEX 3
139 #define EJECT 7
140 #define SETMFM 9
141 #define SETGCR 13
142
143 /* Select values for swim3_select and swim3_readbit */
144 #define STEP_DIR 0
145 #define STEPPING 1
146 #define MOTOR_ON 2
147 #define RELAX 3 /* also eject in progress */
148 #define READ_DATA_0 4
149 #define TWOMEG_DRIVE 5
150 #define SINGLE_SIDED 6 /* drive or diskette is 4MB type? */
151 #define DRIVE_PRESENT 7
152 #define DISK_IN 8
153 #define WRITE_PROT 9
154 #define TRACK_ZERO 10
155 #define TACHO 11
156 #define READ_DATA_1 12
157 #define MFM_MODE 13
158 #define SEEK_COMPLETE 14
159 #define ONEMEG_MEDIA 15
160
161 /* Definitions of values used in writing and formatting */
162 #define DATA_ESCAPE 0x99
163 #define GCR_SYNC_EXC 0x3f
164 #define GCR_SYNC_CONV 0x80
165 #define GCR_FIRST_MARK 0xd5
166 #define GCR_SECOND_MARK 0xaa
167 #define GCR_ADDR_MARK "\xd5\xaa\x00"
168 #define GCR_DATA_MARK "\xd5\xaa\x0b"
169 #define GCR_SLIP_BYTE "\x27\xaa"
170 #define GCR_SELF_SYNC "\x3f\xbf\x1e\x34\x3c\x3f"
171
172 #define DATA_99 "\x99\x99"
173 #define MFM_ADDR_MARK "\x99\xa1\x99\xa1\x99\xa1\x99\xfe"
174 #define MFM_INDEX_MARK "\x99\xc2\x99\xc2\x99\xc2\x99\xfc"
175 #define MFM_GAP_LEN 12
176
177 struct floppy_state {
178 enum swim_state state;
179 struct swim3 __iomem *swim3; /* hardware registers */
180 struct dbdma_regs __iomem *dma; /* DMA controller registers */
181 int swim3_intr; /* interrupt number for SWIM3 */
182 int dma_intr; /* interrupt number for DMA channel */
183 int cur_cyl; /* cylinder head is on, or -1 */
184 int cur_sector; /* last sector we saw go past */
185 int req_cyl; /* the cylinder for the current r/w request */
186 int head; /* head number ditto */
187 int req_sector; /* sector number ditto */
188 int scount; /* # sectors we're transferring at present */
189 int retries;
190 int settle_time;
191 int secpercyl; /* disk geometry information */
192 int secpertrack;
193 int total_secs;
194 int write_prot; /* 1 if write-protected, 0 if not, -1 dunno */
195 struct dbdma_cmd *dma_cmd;
196 int ref_count;
197 int expect_cyl;
198 struct timer_list timeout;
199 int timeout_pending;
200 int ejected;
201 wait_queue_head_t wait;
202 int wanted;
203 struct device_node* media_bay; /* NULL when not in bay */
204 char dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)];
205 };
206
207 static struct floppy_state floppy_states[MAX_FLOPPIES];
208 static int floppy_count = 0;
209 static DEFINE_SPINLOCK(swim3_lock);
210
211 static unsigned short write_preamble[] = {
212 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */
213 0, 0, 0, 0, 0, 0, /* sync field */
214 0x99a1, 0x99a1, 0x99a1, 0x99fb, /* data address mark */
215 0x990f /* no escape for 512 bytes */
216 };
217
218 static unsigned short write_postamble[] = {
219 0x9904, /* insert CRC */
220 0x4e4e, 0x4e4e,
221 0x9908, /* stop writing */
222 0, 0, 0, 0, 0, 0
223 };
224
225 static void swim3_select(struct floppy_state *fs, int sel);
226 static void swim3_action(struct floppy_state *fs, int action);
227 static int swim3_readbit(struct floppy_state *fs, int bit);
228 static void do_fd_request(request_queue_t * q);
229 static void start_request(struct floppy_state *fs);
230 static void set_timeout(struct floppy_state *fs, int nticks,
231 void (*proc)(unsigned long));
232 static void scan_track(struct floppy_state *fs);
233 static void seek_track(struct floppy_state *fs, int n);
234 static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count);
235 static void setup_transfer(struct floppy_state *fs);
236 static void act(struct floppy_state *fs);
237 static void scan_timeout(unsigned long data);
238 static void seek_timeout(unsigned long data);
239 static void settle_timeout(unsigned long data);
240 static void xfer_timeout(unsigned long data);
241 static irqreturn_t swim3_interrupt(int irq, void *dev_id, struct pt_regs *regs);
242 /*static void fd_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs);*/
243 static int grab_drive(struct floppy_state *fs, enum swim_state state,
244 int interruptible);
245 static void release_drive(struct floppy_state *fs);
246 static int fd_eject(struct floppy_state *fs);
247 static int floppy_ioctl(struct inode *inode, struct file *filp,
248 unsigned int cmd, unsigned long param);
249 static int floppy_open(struct inode *inode, struct file *filp);
250 static int floppy_release(struct inode *inode, struct file *filp);
251 static int floppy_check_change(struct gendisk *disk);
252 static int floppy_revalidate(struct gendisk *disk);
253 static int swim3_add_device(struct device_node *swims);
254 int swim3_init(void);
255
256 #ifndef CONFIG_PMAC_PBOOK
257 #define check_media_bay(which, what) 1
258 #endif
259
260 static void swim3_select(struct floppy_state *fs, int sel)
261 {
262 struct swim3 __iomem *sw = fs->swim3;
263
264 out_8(&sw->select, RELAX);
265 if (sel & 8)
266 out_8(&sw->control_bis, SELECT);
267 else
268 out_8(&sw->control_bic, SELECT);
269 out_8(&sw->select, sel & CA_MASK);
270 }
271
272 static void swim3_action(struct floppy_state *fs, int action)
273 {
274 struct swim3 __iomem *sw = fs->swim3;
275
276 swim3_select(fs, action);
277 udelay(1);
278 out_8(&sw->select, sw->select | LSTRB);
279 udelay(2);
280 out_8(&sw->select, sw->select & ~LSTRB);
281 udelay(1);
282 }
283
284 static int swim3_readbit(struct floppy_state *fs, int bit)
285 {
286 struct swim3 __iomem *sw = fs->swim3;
287 int stat;
288
289 swim3_select(fs, bit);
290 udelay(1);
291 stat = in_8(&sw->status);
292 return (stat & DATA) == 0;
293 }
294
295 static void do_fd_request(request_queue_t * q)
296 {
297 int i;
298 for(i=0;i<floppy_count;i++)
299 {
300 if (floppy_states[i].media_bay &&
301 check_media_bay(floppy_states[i].media_bay, MB_FD))
302 continue;
303 start_request(&floppy_states[i]);
304 }
305 sti();
306 }
307
308 static void start_request(struct floppy_state *fs)
309 {
310 struct request *req;
311 unsigned long x;
312
313 if (fs->state == idle && fs->wanted) {
314 fs->state = available;
315 wake_up(&fs->wait);
316 return;
317 }
318 while (fs->state == idle && (req = elv_next_request(swim3_queue))) {
319 #if 0
320 printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%ld buf=%p\n",
321 req->rq_disk->disk_name, req->cmd,
322 (long)req->sector, req->nr_sectors, req->buffer);
323 printk(" rq_status=%d errors=%d current_nr_sectors=%ld\n",
324 req->rq_status, req->errors, req->current_nr_sectors);
325 #endif
326
327 if (req->sector < 0 || req->sector >= fs->total_secs) {
328 end_request(req, 0);
329 continue;
330 }
331 if (req->current_nr_sectors == 0) {
332 end_request(req, 1);
333 continue;
334 }
335 if (fs->ejected) {
336 end_request(req, 0);
337 continue;
338 }
339
340 if (rq_data_dir(req) == WRITE) {
341 if (fs->write_prot < 0)
342 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
343 if (fs->write_prot) {
344 end_request(req, 0);
345 continue;
346 }
347 }
348
349 /* Do not remove the cast. req->sector is now a sector_t and
350 * can be 64 bits, but it will never go past 32 bits for this
351 * driver anyway, so we can safely cast it down and not have
352 * to do a 64/32 division
353 */
354 fs->req_cyl = ((long)req->sector) / fs->secpercyl;
355 x = ((long)req->sector) % fs->secpercyl;
356 fs->head = x / fs->secpertrack;
357 fs->req_sector = x % fs->secpertrack + 1;
358 fd_req = req;
359 fs->state = do_transfer;
360 fs->retries = 0;
361
362 act(fs);
363 }
364 }
365
366 static void set_timeout(struct floppy_state *fs, int nticks,
367 void (*proc)(unsigned long))
368 {
369 unsigned long flags;
370
371 save_flags(flags); cli();
372 if (fs->timeout_pending)
373 del_timer(&fs->timeout);
374 fs->timeout.expires = jiffies + nticks;
375 fs->timeout.function = proc;
376 fs->timeout.data = (unsigned long) fs;
377 add_timer(&fs->timeout);
378 fs->timeout_pending = 1;
379 restore_flags(flags);
380 }
381
382 static inline void scan_track(struct floppy_state *fs)
383 {
384 struct swim3 __iomem *sw = fs->swim3;
385
386 swim3_select(fs, READ_DATA_0);
387 in_8(&sw->intr); /* clear SEEN_SECTOR bit */
388 in_8(&sw->error);
389 out_8(&sw->intr_enable, SEEN_SECTOR);
390 out_8(&sw->control_bis, DO_ACTION);
391 /* enable intr when track found */
392 set_timeout(fs, HZ, scan_timeout); /* enable timeout */
393 }
394
395 static inline void seek_track(struct floppy_state *fs, int n)
396 {
397 struct swim3 __iomem *sw = fs->swim3;
398
399 if (n >= 0) {
400 swim3_action(fs, SEEK_POSITIVE);
401 sw->nseek = n;
402 } else {
403 swim3_action(fs, SEEK_NEGATIVE);
404 sw->nseek = -n;
405 }
406 fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
407 swim3_select(fs, STEP);
408 in_8(&sw->error);
409 /* enable intr when seek finished */
410 out_8(&sw->intr_enable, SEEK_DONE);
411 out_8(&sw->control_bis, DO_SEEK);
412 set_timeout(fs, 3*HZ, seek_timeout); /* enable timeout */
413 fs->settle_time = 0;
414 }
415
416 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
417 void *buf, int count)
418 {
419 st_le16(&cp->req_count, count);
420 st_le16(&cp->command, cmd);
421 st_le32(&cp->phy_addr, virt_to_bus(buf));
422 cp->xfer_status = 0;
423 }
424
425 static inline void setup_transfer(struct floppy_state *fs)
426 {
427 int n;
428 struct swim3 __iomem *sw = fs->swim3;
429 struct dbdma_cmd *cp = fs->dma_cmd;
430 struct dbdma_regs __iomem *dr = fs->dma;
431
432 if (fd_req->current_nr_sectors <= 0) {
433 printk(KERN_ERR "swim3: transfer 0 sectors?\n");
434 return;
435 }
436 if (rq_data_dir(fd_req) == WRITE)
437 n = 1;
438 else {
439 n = fs->secpertrack - fs->req_sector + 1;
440 if (n > fd_req->current_nr_sectors)
441 n = fd_req->current_nr_sectors;
442 }
443 fs->scount = n;
444 swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
445 out_8(&sw->sector, fs->req_sector);
446 out_8(&sw->nsect, n);
447 out_8(&sw->gap3, 0);
448 out_le32(&dr->cmdptr, virt_to_bus(cp));
449 if (rq_data_dir(fd_req) == WRITE) {
450 /* Set up 3 dma commands: write preamble, data, postamble */
451 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
452 ++cp;
453 init_dma(cp, OUTPUT_MORE, fd_req->buffer, 512);
454 ++cp;
455 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
456 } else {
457 init_dma(cp, INPUT_LAST, fd_req->buffer, n * 512);
458 }
459 ++cp;
460 out_le16(&cp->command, DBDMA_STOP);
461 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
462 in_8(&sw->error);
463 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
464 if (rq_data_dir(fd_req) == WRITE)
465 out_8(&sw->control_bis, WRITE_SECTORS);
466 in_8(&sw->intr);
467 out_le32(&dr->control, (RUN << 16) | RUN);
468 /* enable intr when transfer complete */
469 out_8(&sw->intr_enable, TRANSFER_DONE);
470 out_8(&sw->control_bis, DO_ACTION);
471 set_timeout(fs, 2*HZ, xfer_timeout); /* enable timeout */
472 }
473
474 static void act(struct floppy_state *fs)
475 {
476 for (;;) {
477 switch (fs->state) {
478 case idle:
479 return; /* XXX shouldn't get here */
480
481 case locating:
482 if (swim3_readbit(fs, TRACK_ZERO)) {
483 fs->cur_cyl = 0;
484 if (fs->req_cyl == 0)
485 fs->state = do_transfer;
486 else
487 fs->state = seeking;
488 break;
489 }
490 scan_track(fs);
491 return;
492
493 case seeking:
494 if (fs->cur_cyl < 0) {
495 fs->expect_cyl = -1;
496 fs->state = locating;
497 break;
498 }
499 if (fs->req_cyl == fs->cur_cyl) {
500 printk("whoops, seeking 0\n");
501 fs->state = do_transfer;
502 break;
503 }
504 seek_track(fs, fs->req_cyl - fs->cur_cyl);
505 return;
506
507 case settling:
508 /* check for SEEK_COMPLETE after 30ms */
509 fs->settle_time = (HZ + 32) / 33;
510 set_timeout(fs, fs->settle_time, settle_timeout);
511 return;
512
513 case do_transfer:
514 if (fs->cur_cyl != fs->req_cyl) {
515 if (fs->retries > 5) {
516 end_request(fd_req, 0);
517 fs->state = idle;
518 return;
519 }
520 fs->state = seeking;
521 break;
522 }
523 setup_transfer(fs);
524 return;
525
526 case jogging:
527 seek_track(fs, -5);
528 return;
529
530 default:
531 printk(KERN_ERR"swim3: unknown state %d\n", fs->state);
532 return;
533 }
534 }
535 }
536
537 static void scan_timeout(unsigned long data)
538 {
539 struct floppy_state *fs = (struct floppy_state *) data;
540 struct swim3 __iomem *sw = fs->swim3;
541
542 fs->timeout_pending = 0;
543 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
544 out_8(&sw->select, RELAX);
545 out_8(&sw->intr_enable, 0);
546 fs->cur_cyl = -1;
547 if (fs->retries > 5) {
548 end_request(fd_req, 0);
549 fs->state = idle;
550 start_request(fs);
551 } else {
552 fs->state = jogging;
553 act(fs);
554 }
555 }
556
557 static void seek_timeout(unsigned long data)
558 {
559 struct floppy_state *fs = (struct floppy_state *) data;
560 struct swim3 __iomem *sw = fs->swim3;
561
562 fs->timeout_pending = 0;
563 out_8(&sw->control_bic, DO_SEEK);
564 out_8(&sw->select, RELAX);
565 out_8(&sw->intr_enable, 0);
566 printk(KERN_ERR "swim3: seek timeout\n");
567 end_request(fd_req, 0);
568 fs->state = idle;
569 start_request(fs);
570 }
571
572 static void settle_timeout(unsigned long data)
573 {
574 struct floppy_state *fs = (struct floppy_state *) data;
575 struct swim3 __iomem *sw = fs->swim3;
576
577 fs->timeout_pending = 0;
578 if (swim3_readbit(fs, SEEK_COMPLETE)) {
579 out_8(&sw->select, RELAX);
580 fs->state = locating;
581 act(fs);
582 return;
583 }
584 out_8(&sw->select, RELAX);
585 if (fs->settle_time < 2*HZ) {
586 ++fs->settle_time;
587 set_timeout(fs, 1, settle_timeout);
588 return;
589 }
590 printk(KERN_ERR "swim3: seek settle timeout\n");
591 end_request(fd_req, 0);
592 fs->state = idle;
593 start_request(fs);
594 }
595
596 static void xfer_timeout(unsigned long data)
597 {
598 struct floppy_state *fs = (struct floppy_state *) data;
599 struct swim3 __iomem *sw = fs->swim3;
600 struct dbdma_regs __iomem *dr = fs->dma;
601 struct dbdma_cmd *cp = fs->dma_cmd;
602 unsigned long s;
603 int n;
604
605 fs->timeout_pending = 0;
606 out_le32(&dr->control, RUN << 16);
607 /* We must wait a bit for dbdma to stop */
608 for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
609 udelay(1);
610 out_8(&sw->intr_enable, 0);
611 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
612 out_8(&sw->select, RELAX);
613 if (rq_data_dir(fd_req) == WRITE)
614 ++cp;
615 if (ld_le16(&cp->xfer_status) != 0)
616 s = fs->scount - ((ld_le16(&cp->res_count) + 511) >> 9);
617 else
618 s = 0;
619 fd_req->sector += s;
620 fd_req->current_nr_sectors -= s;
621 printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
622 (rq_data_dir(fd_req)==WRITE? "writ": "read"), (long)fd_req->sector);
623 end_request(fd_req, 0);
624 fs->state = idle;
625 start_request(fs);
626 }
627
628 static irqreturn_t swim3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
629 {
630 struct floppy_state *fs = (struct floppy_state *) dev_id;
631 struct swim3 __iomem *sw = fs->swim3;
632 int intr, err, n;
633 int stat, resid;
634 struct dbdma_regs __iomem *dr;
635 struct dbdma_cmd *cp;
636
637 intr = in_8(&sw->intr);
638 err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
639 if ((intr & ERROR_INTR) && fs->state != do_transfer)
640 printk(KERN_ERR "swim3_interrupt, state=%d, dir=%lx, intr=%x, err=%x\n",
641 fs->state, rq_data_dir(fd_req), intr, err);
642 switch (fs->state) {
643 case locating:
644 if (intr & SEEN_SECTOR) {
645 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
646 out_8(&sw->select, RELAX);
647 out_8(&sw->intr_enable, 0);
648 del_timer(&fs->timeout);
649 fs->timeout_pending = 0;
650 if (sw->ctrack == 0xff) {
651 printk(KERN_ERR "swim3: seen sector but cyl=ff?\n");
652 fs->cur_cyl = -1;
653 if (fs->retries > 5) {
654 end_request(fd_req, 0);
655 fs->state = idle;
656 start_request(fs);
657 } else {
658 fs->state = jogging;
659 act(fs);
660 }
661 break;
662 }
663 fs->cur_cyl = sw->ctrack;
664 fs->cur_sector = sw->csect;
665 if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
666 printk(KERN_ERR "swim3: expected cyl %d, got %d\n",
667 fs->expect_cyl, fs->cur_cyl);
668 fs->state = do_transfer;
669 act(fs);
670 }
671 break;
672 case seeking:
673 case jogging:
674 if (sw->nseek == 0) {
675 out_8(&sw->control_bic, DO_SEEK);
676 out_8(&sw->select, RELAX);
677 out_8(&sw->intr_enable, 0);
678 del_timer(&fs->timeout);
679 fs->timeout_pending = 0;
680 if (fs->state == seeking)
681 ++fs->retries;
682 fs->state = settling;
683 act(fs);
684 }
685 break;
686 case settling:
687 out_8(&sw->intr_enable, 0);
688 del_timer(&fs->timeout);
689 fs->timeout_pending = 0;
690 act(fs);
691 break;
692 case do_transfer:
693 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
694 break;
695 out_8(&sw->intr_enable, 0);
696 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
697 out_8(&sw->select, RELAX);
698 del_timer(&fs->timeout);
699 fs->timeout_pending = 0;
700 dr = fs->dma;
701 cp = fs->dma_cmd;
702 if (rq_data_dir(fd_req) == WRITE)
703 ++cp;
704 /*
705 * Check that the main data transfer has finished.
706 * On writing, the swim3 sometimes doesn't use
707 * up all the bytes of the postamble, so we can still
708 * see DMA active here. That doesn't matter as long
709 * as all the sector data has been transferred.
710 */
711 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
712 /* wait a little while for DMA to complete */
713 for (n = 0; n < 100; ++n) {
714 if (cp->xfer_status != 0)
715 break;
716 udelay(1);
717 barrier();
718 }
719 }
720 /* turn off DMA */
721 out_le32(&dr->control, (RUN | PAUSE) << 16);
722 stat = ld_le16(&cp->xfer_status);
723 resid = ld_le16(&cp->res_count);
724 if (intr & ERROR_INTR) {
725 n = fs->scount - 1 - resid / 512;
726 if (n > 0) {
727 fd_req->sector += n;
728 fd_req->current_nr_sectors -= n;
729 fd_req->buffer += n * 512;
730 fs->req_sector += n;
731 }
732 if (fs->retries < 5) {
733 ++fs->retries;
734 act(fs);
735 } else {
736 printk("swim3: error %sing block %ld (err=%x)\n",
737 rq_data_dir(fd_req) == WRITE? "writ": "read",
738 (long)fd_req->sector, err);
739 end_request(fd_req, 0);
740 fs->state = idle;
741 }
742 } else {
743 if ((stat & ACTIVE) == 0 || resid != 0) {
744 /* musta been an error */
745 printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid);
746 printk(KERN_ERR " state=%d, dir=%lx, intr=%x, err=%x\n",
747 fs->state, rq_data_dir(fd_req), intr, err);
748 end_request(fd_req, 0);
749 fs->state = idle;
750 start_request(fs);
751 break;
752 }
753 fd_req->sector += fs->scount;
754 fd_req->current_nr_sectors -= fs->scount;
755 fd_req->buffer += fs->scount * 512;
756 if (fd_req->current_nr_sectors <= 0) {
757 end_request(fd_req, 1);
758 fs->state = idle;
759 } else {
760 fs->req_sector += fs->scount;
761 if (fs->req_sector > fs->secpertrack) {
762 fs->req_sector -= fs->secpertrack;
763 if (++fs->head > 1) {
764 fs->head = 0;
765 ++fs->req_cyl;
766 }
767 }
768 act(fs);
769 }
770 }
771 if (fs->state == idle)
772 start_request(fs);
773 break;
774 default:
775 printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state);
776 }
777 return IRQ_HANDLED;
778 }
779
780 /*
781 static void fd_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs)
782 {
783 }
784 */
785
786 static int grab_drive(struct floppy_state *fs, enum swim_state state,
787 int interruptible)
788 {
789 unsigned long flags;
790
791 save_flags(flags);
792 cli();
793 if (fs->state != idle) {
794 ++fs->wanted;
795 while (fs->state != available) {
796 if (interruptible && signal_pending(current)) {
797 --fs->wanted;
798 restore_flags(flags);
799 return -EINTR;
800 }
801 interruptible_sleep_on(&fs->wait);
802 }
803 --fs->wanted;
804 }
805 fs->state = state;
806 restore_flags(flags);
807 return 0;
808 }
809
810 static void release_drive(struct floppy_state *fs)
811 {
812 unsigned long flags;
813
814 save_flags(flags);
815 cli();
816 fs->state = idle;
817 start_request(fs);
818 restore_flags(flags);
819 }
820
821 static int fd_eject(struct floppy_state *fs)
822 {
823 int err, n;
824
825 err = grab_drive(fs, ejecting, 1);
826 if (err)
827 return err;
828 swim3_action(fs, EJECT);
829 for (n = 20; n > 0; --n) {
830 if (signal_pending(current)) {
831 err = -EINTR;
832 break;
833 }
834 swim3_select(fs, RELAX);
835 current->state = TASK_INTERRUPTIBLE;
836 schedule_timeout(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 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
860 return -ENXIO;
861
862 switch (cmd) {
863 case FDEJECT:
864 if (fs->ref_count != 1)
865 return -EBUSY;
866 err = fd_eject(fs);
867 return err;
868 case FDGETPRM:
869 if (copy_to_user((void __user *) param, &floppy_type,
870 sizeof(struct floppy_struct)))
871 return -EFAULT;
872 return 0;
873 }
874 return -ENOTTY;
875 }
876
877 static int floppy_open(struct inode *inode, struct file *filp)
878 {
879 struct floppy_state *fs = inode->i_bdev->bd_disk->private_data;
880 struct swim3 __iomem *sw = fs->swim3;
881 int n, err = 0;
882
883 if (fs->ref_count == 0) {
884 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
885 return -ENXIO;
886 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
887 out_8(&sw->control_bic, 0xff);
888 out_8(&sw->mode, 0x95);
889 udelay(10);
890 out_8(&sw->intr_enable, 0);
891 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
892 swim3_action(fs, MOTOR_ON);
893 fs->write_prot = -1;
894 fs->cur_cyl = -1;
895 for (n = 0; n < 2 * HZ; ++n) {
896 if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
897 break;
898 if (signal_pending(current)) {
899 err = -EINTR;
900 break;
901 }
902 swim3_select(fs, RELAX);
903 current->state = TASK_INTERRUPTIBLE;
904 schedule_timeout(1);
905 }
906 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
907 || swim3_readbit(fs, DISK_IN) == 0))
908 err = -ENXIO;
909 swim3_action(fs, SETMFM);
910 swim3_select(fs, RELAX);
911
912 } else if (fs->ref_count == -1 || filp->f_flags & O_EXCL)
913 return -EBUSY;
914
915 if (err == 0 && (filp->f_flags & O_NDELAY) == 0
916 && (filp->f_mode & 3)) {
917 check_disk_change(inode->i_bdev);
918 if (fs->ejected)
919 err = -ENXIO;
920 }
921
922 if (err == 0 && (filp->f_mode & 2)) {
923 if (fs->write_prot < 0)
924 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
925 if (fs->write_prot)
926 err = -EROFS;
927 }
928
929 if (err) {
930 if (fs->ref_count == 0) {
931 swim3_action(fs, MOTOR_OFF);
932 out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
933 swim3_select(fs, RELAX);
934 }
935 return err;
936 }
937
938 if (filp->f_flags & O_EXCL)
939 fs->ref_count = -1;
940 else
941 ++fs->ref_count;
942
943 return 0;
944 }
945
946 static int floppy_release(struct inode *inode, struct file *filp)
947 {
948 struct floppy_state *fs = inode->i_bdev->bd_disk->private_data;
949 struct swim3 __iomem *sw = fs->swim3;
950 if (fs->ref_count > 0 && --fs->ref_count == 0) {
951 swim3_action(fs, MOTOR_OFF);
952 out_8(&sw->control_bic, 0xff);
953 swim3_select(fs, RELAX);
954 }
955 return 0;
956 }
957
958 static int floppy_check_change(struct gendisk *disk)
959 {
960 struct floppy_state *fs = disk->private_data;
961 return fs->ejected;
962 }
963
964 static int floppy_revalidate(struct gendisk *disk)
965 {
966 struct floppy_state *fs = disk->private_data;
967 struct swim3 __iomem *sw;
968 int ret, n;
969
970 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
971 return -ENXIO;
972
973 sw = fs->swim3;
974 grab_drive(fs, revalidating, 0);
975 out_8(&sw->intr_enable, 0);
976 out_8(&sw->control_bis, DRIVE_ENABLE);
977 swim3_action(fs, MOTOR_ON); /* necessary? */
978 fs->write_prot = -1;
979 fs->cur_cyl = -1;
980 mdelay(1);
981 for (n = HZ; n > 0; --n) {
982 if (swim3_readbit(fs, SEEK_COMPLETE))
983 break;
984 if (signal_pending(current))
985 break;
986 swim3_select(fs, RELAX);
987 current->state = TASK_INTERRUPTIBLE;
988 schedule_timeout(1);
989 }
990 ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
991 || swim3_readbit(fs, DISK_IN) == 0;
992 if (ret)
993 swim3_action(fs, MOTOR_OFF);
994 else {
995 fs->ejected = 0;
996 swim3_action(fs, SETMFM);
997 }
998 swim3_select(fs, RELAX);
999
1000 release_drive(fs);
1001 return ret;
1002 }
1003
1004 static struct block_device_operations floppy_fops = {
1005 .open = floppy_open,
1006 .release = floppy_release,
1007 .ioctl = floppy_ioctl,
1008 .media_changed = floppy_check_change,
1009 .revalidate_disk= floppy_revalidate,
1010 };
1011
1012 int swim3_init(void)
1013 {
1014 struct device_node *swim;
1015 int err = -ENOMEM;
1016 int i;
1017
1018 devfs_mk_dir("floppy");
1019
1020 swim = find_devices("floppy");
1021 while (swim && (floppy_count < MAX_FLOPPIES))
1022 {
1023 swim3_add_device(swim);
1024 swim = swim->next;
1025 }
1026
1027 swim = find_devices("swim3");
1028 while (swim && (floppy_count < MAX_FLOPPIES))
1029 {
1030 swim3_add_device(swim);
1031 swim = swim->next;
1032 }
1033
1034 if (!floppy_count)
1035 return -ENODEV;
1036
1037 for (i = 0; i < floppy_count; i++) {
1038 disks[i] = alloc_disk(1);
1039 if (!disks[i])
1040 goto out;
1041 }
1042
1043 if (register_blkdev(FLOPPY_MAJOR, "fd")) {
1044 err = -EBUSY;
1045 goto out;
1046 }
1047
1048 swim3_queue = blk_init_queue(do_fd_request, &swim3_lock);
1049 if (!swim3_queue) {
1050 err = -ENOMEM;
1051 goto out_queue;
1052 }
1053
1054 for (i = 0; i < floppy_count; i++) {
1055 struct gendisk *disk = disks[i];
1056 disk->major = FLOPPY_MAJOR;
1057 disk->first_minor = i;
1058 disk->fops = &floppy_fops;
1059 disk->private_data = &floppy_states[i];
1060 disk->queue = swim3_queue;
1061 disk->flags |= GENHD_FL_REMOVABLE;
1062 sprintf(disk->disk_name, "fd%d", i);
1063 sprintf(disk->devfs_name, "floppy/%d", i);
1064 set_capacity(disk, 2880);
1065 add_disk(disk);
1066 }
1067 return 0;
1068
1069 out_queue:
1070 unregister_blkdev(FLOPPY_MAJOR, "fd");
1071 out:
1072 while (i--)
1073 put_disk(disks[i]);
1074 /* shouldn't we do something with results of swim_add_device()? */
1075 return err;
1076 }
1077
1078 static int swim3_add_device(struct device_node *swim)
1079 {
1080 struct device_node *mediabay;
1081 struct floppy_state *fs = &floppy_states[floppy_count];
1082
1083 if (swim->n_addrs < 2)
1084 {
1085 printk(KERN_INFO "swim3: expecting 2 addrs (n_addrs:%d, n_intrs:%d)\n",
1086 swim->n_addrs, swim->n_intrs);
1087 return -EINVAL;
1088 }
1089
1090 if (swim->n_intrs < 2)
1091 {
1092 printk(KERN_INFO "swim3: expecting 2 intrs (n_addrs:%d, n_intrs:%d)\n",
1093 swim->n_addrs, swim->n_intrs);
1094 return -EINVAL;
1095 }
1096
1097 if (!request_OF_resource(swim, 0, NULL)) {
1098 printk(KERN_INFO "swim3: can't request IO resource !\n");
1099 return -EINVAL;
1100 }
1101
1102 mediabay = (strcasecmp(swim->parent->type, "media-bay") == 0) ? swim->parent : NULL;
1103 if (mediabay == NULL)
1104 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1105
1106 memset(fs, 0, sizeof(*fs));
1107 fs->state = idle;
1108 fs->swim3 = (struct swim3 __iomem *)
1109 ioremap(swim->addrs[0].address, 0x200);
1110 fs->dma = (struct dbdma_regs __iomem *)
1111 ioremap(swim->addrs[1].address, 0x200);
1112 fs->swim3_intr = swim->intrs[0].line;
1113 fs->dma_intr = swim->intrs[1].line;
1114 fs->cur_cyl = -1;
1115 fs->cur_sector = -1;
1116 fs->secpercyl = 36;
1117 fs->secpertrack = 18;
1118 fs->total_secs = 2880;
1119 fs->media_bay = mediabay;
1120 init_waitqueue_head(&fs->wait);
1121
1122 fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1123 memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1124 st_le16(&fs->dma_cmd[1].command, DBDMA_STOP);
1125
1126 if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1127 printk(KERN_ERR "Couldn't get irq %d for SWIM3\n", fs->swim3_intr);
1128 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1129 return -EBUSY;
1130 }
1131 /*
1132 if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) {
1133 printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA",
1134 fs->dma_intr);
1135 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1136 return -EBUSY;
1137 }
1138 */
1139
1140 init_timer(&fs->timeout);
1141
1142 printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count,
1143 mediabay ? "in media bay" : "");
1144
1145 floppy_count++;
1146
1147 return 0;
1148 }
1149
1150 module_init(swim3_init)
1151
1152 MODULE_LICENSE("GPL");
1153 MODULE_AUTHOR("Paul Mackerras");
1154 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);
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