1 /*
2 * Driver for the SWIM3 (Super Woz Integrated Machine 3)
3 * floppy controller found on Power Macintoshes.
4 *
5 * Copyright (C) 1996-2003 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 <asm/io.h>
28 #include <asm/dbdma.h>
29 #include <asm/prom.h>
30 #include <asm/uaccess.h>
31 #include <asm/mediabay.h>
32 #include <asm/machdep.h>
33 #include <asm/pmac_feature.h>
34
35 #define MAJOR_NR FLOPPY_MAJOR
36 #include <linux/blk.h>
37 #include <linux/devfs_fs_kernel.h>
38
39 static int floppy_blocksizes[2] = {512,512};
40 static int floppy_sizes[2] = {1440,1440};
41
42 #define MAX_FLOPPIES 2
43
44 enum swim_state {
45 idle,
46 locating,
47 seeking,
48 settling,
49 do_transfer,
50 jogging,
51 available,
52 revalidating,
53 ejecting
54 };
55
56 #define REG(x) unsigned char x; char x ## _pad[15];
57
58 /*
59 * The names for these registers mostly represent speculation on my part.
60 * It will be interesting to see how close they are to the names Apple uses.
61 */
62 struct swim3 {
63 REG(data);
64 REG(timer); /* counts down at 1MHz */
65 REG(error);
66 REG(mode);
67 REG(select); /* controls CA0, CA1, CA2 and LSTRB signals */
68 REG(setup);
69 REG(control); /* writing bits clears them */
70 REG(status); /* writing bits sets them in control */
71 REG(intr);
72 REG(nseek); /* # tracks to seek */
73 REG(ctrack); /* current track number */
74 REG(csect); /* current sector number */
75 REG(gap3); /* size of gap 3 in track format */
76 REG(sector); /* sector # to read or write */
77 REG(nsect); /* # sectors to read or write */
78 REG(intr_enable);
79 };
80
81 #define control_bic control
82 #define control_bis status
83
84 /* Bits in select register */
85 #define CA_MASK 7
86 #define LSTRB 8
87
88 /* Bits in control register */
89 #define DO_SEEK 0x80
90 #define FORMAT 0x40
91 #define SELECT 0x20
92 #define WRITE_SECTORS 0x10
93 #define DO_ACTION 0x08
94 #define DRIVE2_ENABLE 0x04
95 #define DRIVE_ENABLE 0x02
96 #define INTR_ENABLE 0x01
97
98 /* Bits in status register */
99 #define FIFO_1BYTE 0x80
100 #define FIFO_2BYTE 0x40
101 #define ERROR 0x20
102 #define DATA 0x08
103 #define RDDATA 0x04
104 #define INTR_PENDING 0x02
105 #define MARK_BYTE 0x01
106
107 /* Bits in intr and intr_enable registers */
108 #define ERROR_INTR 0x20
109 #define DATA_CHANGED 0x10
110 #define TRANSFER_DONE 0x08
111 #define SEEN_SECTOR 0x04
112 #define SEEK_DONE 0x02
113 #define TIMER_DONE 0x01
114
115 /* Bits in error register */
116 #define ERR_DATA_CRC 0x80
117 #define ERR_ADDR_CRC 0x40
118 #define ERR_OVERRUN 0x04
119 #define ERR_UNDERRUN 0x01
120
121 /* Bits in setup register */
122 #define S_SW_RESET 0x80
123 #define S_GCR_WRITE 0x40
124 #define S_IBM_DRIVE 0x20
125 #define S_TEST_MODE 0x10
126 #define S_FCLK_DIV2 0x08
127 #define S_GCR 0x04
128 #define S_COPY_PROT 0x02
129 #define S_INV_WDATA 0x01
130
131 /* Select values for swim3_action */
132 #define SEEK_POSITIVE 0
133 #define SEEK_NEGATIVE 4
134 #define STEP 1
135 #define MOTOR_ON 2
136 #define MOTOR_OFF 6
137 #define INDEX 3
138 #define EJECT 7
139 #define SETMFM 9
140 #define SETGCR 13
141
142 /* Select values for swim3_select and swim3_readbit */
143 #define STEP_DIR 0
144 #define STEPPING 1
145 #define MOTOR_ON 2
146 #define RELAX 3 /* also eject in progress */
147 #define READ_DATA_0 4
148 #define TWOMEG_DRIVE 5
149 #define SINGLE_SIDED 6 /* drive or diskette is 4MB type? */
150 #define DRIVE_PRESENT 7
151 #define DISK_IN 8
152 #define WRITE_PROT 9
153 #define TRACK_ZERO 10
154 #define TACHO 11
155 #define READ_DATA_1 12
156 #define MFM_MODE 13
157 #define SEEK_COMPLETE 14
158 #define ONEMEG_MEDIA 15
159
160 /* Definitions of values used in writing and formatting */
161 #define DATA_ESCAPE 0x99
162 #define GCR_SYNC_EXC 0x3f
163 #define GCR_SYNC_CONV 0x80
164 #define GCR_FIRST_MARK 0xd5
165 #define GCR_SECOND_MARK 0xaa
166 #define GCR_ADDR_MARK "\xd5\xaa\x00"
167 #define GCR_DATA_MARK "\xd5\xaa\x0b"
168 #define GCR_SLIP_BYTE "\x27\xaa"
169 #define GCR_SELF_SYNC "\x3f\xbf\x1e\x34\x3c\x3f"
170
171 #define DATA_99 "\x99\x99"
172 #define MFM_ADDR_MARK "\x99\xa1\x99\xa1\x99\xa1\x99\xfe"
173 #define MFM_INDEX_MARK "\x99\xc2\x99\xc2\x99\xc2\x99\xfc"
174 #define MFM_GAP_LEN 12
175
176 struct floppy_state {
177 enum swim_state state;
178 volatile struct swim3 *swim3; /* hardware registers */
179 struct dbdma_regs *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 device_node* media_bay; /* NULL when not in bay */
203 char dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)];
204 };
205
206 static struct floppy_state floppy_states[MAX_FLOPPIES];
207 static int floppy_count = 0;
208
209 static unsigned short write_preamble[] = {
210 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, 0x4e4e, /* gap field */
211 0, 0, 0, 0, 0, 0, /* sync field */
212 0x99a1, 0x99a1, 0x99a1, 0x99fb, /* data address mark */
213 0x990f /* no escape for 512 bytes */
214 };
215
216 static unsigned short write_postamble[] = {
217 0x9904, /* insert CRC */
218 0x4e4e, 0x4e4e,
219 0x9908, /* stop writing */
220 0, 0, 0, 0, 0, 0
221 };
222
223 static void swim3_select(struct floppy_state *fs, int sel);
224 static void swim3_action(struct floppy_state *fs, int action);
225 static int swim3_readbit(struct floppy_state *fs, int bit);
226 static void do_fd_request(request_queue_t * q);
227 static void start_request(struct floppy_state *fs);
228 static void set_timeout(struct floppy_state *fs, int nticks,
229 void (*proc)(unsigned long));
230 static void scan_track(struct floppy_state *fs);
231 static void seek_track(struct floppy_state *fs, int n);
232 static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count);
233 static void setup_transfer(struct floppy_state *fs);
234 static void act(struct floppy_state *fs);
235 static void scan_timeout(unsigned long data);
236 static void seek_timeout(unsigned long data);
237 static void settle_timeout(unsigned long data);
238 static void xfer_timeout(unsigned long data);
239 static void swim3_interrupt(int irq, void *dev_id, struct pt_regs *regs);
240 /*static void fd_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs);*/
241 static int grab_drive(struct floppy_state *fs, enum swim_state state,
242 int interruptible);
243 static void release_drive(struct floppy_state *fs);
244 static int fd_eject(struct floppy_state *fs);
245 static int floppy_ioctl(struct inode *inode, struct file *filp,
246 unsigned int cmd, unsigned long param);
247 static int floppy_open(struct inode *inode, struct file *filp);
248 static int floppy_release(struct inode *inode, struct file *filp);
249 static int floppy_check_change(kdev_t dev);
250 static int floppy_revalidate(kdev_t dev);
251 static int swim3_add_device(struct device_node *swims);
252 int swim3_init(void);
253
254 #ifndef CONFIG_PMAC_PBOOK
255 #define check_media_bay(which, what) 1
256 #endif
257
swim3_select(struct floppy_state * fs,int sel)258 static void swim3_select(struct floppy_state *fs, int sel)
259 {
260 volatile struct swim3 *sw = fs->swim3;
261
262 out_8(&sw->select, RELAX);
263 if (sel & 8)
264 out_8(&sw->control_bis, SELECT);
265 else
266 out_8(&sw->control_bic, SELECT);
267 out_8(&sw->select, sel & CA_MASK);
268 }
269
swim3_action(struct floppy_state * fs,int action)270 static void swim3_action(struct floppy_state *fs, int action)
271 {
272 volatile struct swim3 *sw = fs->swim3;
273
274 swim3_select(fs, action);
275 udelay(1);
276 out_8(&sw->select, sw->select | LSTRB);
277 udelay(2);
278 out_8(&sw->select, sw->select & ~LSTRB);
279 udelay(1);
280 }
281
swim3_readbit(struct floppy_state * fs,int bit)282 static int swim3_readbit(struct floppy_state *fs, int bit)
283 {
284 volatile struct swim3 *sw = fs->swim3;
285 int stat;
286
287 swim3_select(fs, bit);
288 udelay(1);
289 stat = in_8(&sw->status);
290 return (stat & DATA) == 0;
291 }
292
do_fd_request(request_queue_t * q)293 static void do_fd_request(request_queue_t * q)
294 {
295 int i;
296 for(i=0;i<floppy_count;i++)
297 {
298 if (floppy_states[i].media_bay &&
299 check_media_bay(floppy_states[i].media_bay, MB_FD))
300 continue;
301 start_request(&floppy_states[i]);
302 }
303 sti();
304 }
305
start_request(struct floppy_state * fs)306 static void start_request(struct floppy_state *fs)
307 {
308 unsigned long x;
309
310 if (fs->state == idle && fs->wanted) {
311 fs->state = available;
312 wake_up(&fs->wait);
313 return;
314 }
315 while (!QUEUE_EMPTY && fs->state == idle) {
316 if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
317 panic(DEVICE_NAME ": request list destroyed");
318 if (CURRENT->bh && !buffer_locked(CURRENT->bh))
319 panic(DEVICE_NAME ": block not locked");
320 #if 0
321 printk("do_fd_req: dev=%x cmd=%d sec=%ld nr_sec=%ld buf=%p\n",
322 kdev_t_to_nr(CURRENT->rq_dev), CURRENT->cmd,
323 CURRENT->sector, CURRENT->nr_sectors, CURRENT->buffer);
324 printk(" rq_status=%d errors=%d current_nr_sectors=%ld\n",
325 CURRENT->rq_status, CURRENT->errors, CURRENT->current_nr_sectors);
326 #endif
327
328 if (CURRENT->sector < 0 || CURRENT->sector >= fs->total_secs) {
329 end_request(0);
330 continue;
331 }
332 if (CURRENT->current_nr_sectors == 0) {
333 end_request(1);
334 continue;
335 }
336 if (fs->ejected) {
337 end_request(0);
338 continue;
339 }
340
341 if (CURRENT->cmd == WRITE) {
342 if (fs->write_prot < 0)
343 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
344 if (fs->write_prot) {
345 end_request(0);
346 continue;
347 }
348 }
349
350 fs->req_cyl = CURRENT->sector / fs->secpercyl;
351 x = CURRENT->sector % fs->secpercyl;
352 fs->head = x / fs->secpertrack;
353 fs->req_sector = x % fs->secpertrack + 1;
354 fs->state = do_transfer;
355 fs->retries = 0;
356
357 act(fs);
358 }
359 }
360
set_timeout(struct floppy_state * fs,int nticks,void (* proc)(unsigned long))361 static void set_timeout(struct floppy_state *fs, int nticks,
362 void (*proc)(unsigned long))
363 {
364 unsigned long flags;
365
366 save_flags(flags); cli();
367 if (fs->timeout_pending)
368 del_timer(&fs->timeout);
369 fs->timeout.expires = jiffies + nticks;
370 fs->timeout.function = proc;
371 fs->timeout.data = (unsigned long) fs;
372 add_timer(&fs->timeout);
373 fs->timeout_pending = 1;
374 restore_flags(flags);
375 }
376
scan_track(struct floppy_state * fs)377 static inline void scan_track(struct floppy_state *fs)
378 {
379 volatile struct swim3 *sw = fs->swim3;
380
381 swim3_select(fs, READ_DATA_0);
382 in_8(&sw->intr); /* clear SEEN_SECTOR bit */
383 in_8(&sw->error);
384 out_8(&sw->intr_enable, SEEN_SECTOR);
385 out_8(&sw->control_bis, DO_ACTION);
386 /* enable intr when track found */
387 set_timeout(fs, HZ, scan_timeout); /* enable timeout */
388 }
389
seek_track(struct floppy_state * fs,int n)390 static inline void seek_track(struct floppy_state *fs, int n)
391 {
392 volatile struct swim3 *sw = fs->swim3;
393
394 if (n >= 0) {
395 swim3_action(fs, SEEK_POSITIVE);
396 sw->nseek = n;
397 } else {
398 swim3_action(fs, SEEK_NEGATIVE);
399 sw->nseek = -n;
400 }
401 fs->expect_cyl = (fs->cur_cyl >= 0)? fs->cur_cyl + n: -1;
402 swim3_select(fs, STEP);
403 in_8(&sw->error);
404 /* enable intr when seek finished */
405 out_8(&sw->intr_enable, SEEK_DONE);
406 out_8(&sw->control_bis, DO_SEEK);
407 set_timeout(fs, 3*HZ, seek_timeout); /* enable timeout */
408 fs->settle_time = 0;
409 }
410
init_dma(struct dbdma_cmd * cp,int cmd,void * buf,int count)411 static inline void init_dma(struct dbdma_cmd *cp, int cmd,
412 void *buf, int count)
413 {
414 st_le16(&cp->req_count, count);
415 st_le16(&cp->command, cmd);
416 st_le32(&cp->phy_addr, virt_to_bus(buf));
417 cp->xfer_status = 0;
418 }
419
setup_transfer(struct floppy_state * fs)420 static inline void setup_transfer(struct floppy_state *fs)
421 {
422 int n;
423 volatile struct swim3 *sw = fs->swim3;
424 struct dbdma_cmd *cp = fs->dma_cmd;
425 struct dbdma_regs *dr = fs->dma;
426
427 if (CURRENT->current_nr_sectors <= 0) {
428 printk(KERN_ERR "swim3: transfer 0 sectors?\n");
429 return;
430 }
431 if (CURRENT->cmd == WRITE)
432 n = 1;
433 else {
434 n = fs->secpertrack - fs->req_sector + 1;
435 if (n > CURRENT->current_nr_sectors)
436 n = CURRENT->current_nr_sectors;
437 }
438 fs->scount = n;
439 swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
440 out_8(&sw->sector, fs->req_sector);
441 out_8(&sw->nsect, n);
442 out_8(&sw->gap3, 0);
443 st_le32(&dr->cmdptr, virt_to_bus(cp));
444 if (CURRENT->cmd == WRITE) {
445 /* Set up 3 dma commands: write preamble, data, postamble */
446 init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));
447 ++cp;
448 init_dma(cp, OUTPUT_MORE, CURRENT->buffer, 512);
449 ++cp;
450 init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));
451 } else {
452 init_dma(cp, INPUT_LAST, CURRENT->buffer, n * 512);
453 }
454 ++cp;
455 out_le16(&cp->command, DBDMA_STOP);
456 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
457 in_8(&sw->error);
458 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
459 if (CURRENT->cmd == WRITE)
460 out_8(&sw->control_bis, WRITE_SECTORS);
461 in_8(&sw->intr);
462 out_le32(&dr->control, (RUN << 16) | RUN);
463 /* enable intr when transfer complete */
464 out_8(&sw->intr_enable, TRANSFER_DONE);
465 out_8(&sw->control_bis, DO_ACTION);
466 set_timeout(fs, 2*HZ, xfer_timeout); /* enable timeout */
467 }
468
act(struct floppy_state * fs)469 static void act(struct floppy_state *fs)
470 {
471 for (;;) {
472 switch (fs->state) {
473 case idle:
474 return; /* XXX shouldn't get here */
475
476 case locating:
477 if (swim3_readbit(fs, TRACK_ZERO)) {
478 fs->cur_cyl = 0;
479 if (fs->req_cyl == 0)
480 fs->state = do_transfer;
481 else
482 fs->state = seeking;
483 break;
484 }
485 scan_track(fs);
486 return;
487
488 case seeking:
489 if (fs->cur_cyl < 0) {
490 fs->expect_cyl = -1;
491 fs->state = locating;
492 break;
493 }
494 if (fs->req_cyl == fs->cur_cyl) {
495 printk("whoops, seeking 0\n");
496 fs->state = do_transfer;
497 break;
498 }
499 seek_track(fs, fs->req_cyl - fs->cur_cyl);
500 return;
501
502 case settling:
503 /* check for SEEK_COMPLETE after 30ms */
504 fs->settle_time = (HZ + 32) / 33;
505 set_timeout(fs, fs->settle_time, settle_timeout);
506 return;
507
508 case do_transfer:
509 if (fs->cur_cyl != fs->req_cyl) {
510 if (fs->retries > 5) {
511 end_request(0);
512 fs->state = idle;
513 return;
514 }
515 fs->state = seeking;
516 break;
517 }
518 setup_transfer(fs);
519 return;
520
521 case jogging:
522 seek_track(fs, -5);
523 return;
524
525 default:
526 printk(KERN_ERR"swim3: unknown state %d\n", fs->state);
527 return;
528 }
529 }
530 }
531
scan_timeout(unsigned long data)532 static void scan_timeout(unsigned long data)
533 {
534 struct floppy_state *fs = (struct floppy_state *) data;
535 volatile struct swim3 *sw = fs->swim3;
536
537 fs->timeout_pending = 0;
538 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
539 out_8(&sw->select, RELAX);
540 out_8(&sw->intr_enable, 0);
541 fs->cur_cyl = -1;
542 if (fs->retries > 5) {
543 end_request(0);
544 fs->state = idle;
545 start_request(fs);
546 } else {
547 fs->state = jogging;
548 act(fs);
549 }
550 }
551
seek_timeout(unsigned long data)552 static void seek_timeout(unsigned long data)
553 {
554 struct floppy_state *fs = (struct floppy_state *) data;
555 volatile struct swim3 *sw = fs->swim3;
556
557 fs->timeout_pending = 0;
558 out_8(&sw->control_bic, DO_SEEK);
559 out_8(&sw->select, RELAX);
560 out_8(&sw->intr_enable, 0);
561 printk(KERN_ERR "swim3: seek timeout\n");
562 end_request(0);
563 fs->state = idle;
564 start_request(fs);
565 }
566
settle_timeout(unsigned long data)567 static void settle_timeout(unsigned long data)
568 {
569 struct floppy_state *fs = (struct floppy_state *) data;
570 volatile struct swim3 *sw = fs->swim3;
571
572 fs->timeout_pending = 0;
573 if (swim3_readbit(fs, SEEK_COMPLETE)) {
574 out_8(&sw->select, RELAX);
575 fs->state = locating;
576 act(fs);
577 return;
578 }
579 out_8(&sw->select, RELAX);
580 if (fs->settle_time < 2*HZ) {
581 ++fs->settle_time;
582 set_timeout(fs, 1, settle_timeout);
583 return;
584 }
585 printk(KERN_ERR "swim3: seek settle timeout\n");
586 end_request(0);
587 fs->state = idle;
588 start_request(fs);
589 }
590
xfer_timeout(unsigned long data)591 static void xfer_timeout(unsigned long data)
592 {
593 struct floppy_state *fs = (struct floppy_state *) data;
594 volatile struct swim3 *sw = fs->swim3;
595 struct dbdma_regs *dr = fs->dma;
596 struct dbdma_cmd *cp = fs->dma_cmd;
597 unsigned long s;
598 int n;
599
600 fs->timeout_pending = 0;
601 st_le32(&dr->control, RUN << 16);
602 /* We must wait a bit for dbdma to stop */
603 for (n = 0; (in_le32(&dr->status) & ACTIVE) && n < 1000; n++)
604 udelay(1);
605 out_8(&sw->intr_enable, 0);
606 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
607 out_8(&sw->select, RELAX);
608 if (CURRENT->cmd == WRITE)
609 ++cp;
610 if (ld_le16(&cp->xfer_status) != 0)
611 s = fs->scount - ((ld_le16(&cp->res_count) + 511) >> 9);
612 else
613 s = 0;
614 CURRENT->sector += s;
615 CURRENT->current_nr_sectors -= s;
616 printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
617 (CURRENT->cmd==WRITE? "writ": "read"), CURRENT->sector);
618 end_request(0);
619 fs->state = idle;
620 start_request(fs);
621 }
622
swim3_interrupt(int irq,void * dev_id,struct pt_regs * regs)623 static void swim3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
624 {
625 struct floppy_state *fs = (struct floppy_state *) dev_id;
626 volatile struct swim3 *sw = fs->swim3;
627 int intr, err, n;
628 int stat, resid;
629 struct dbdma_regs *dr;
630 struct dbdma_cmd *cp;
631
632 intr = in_8(&sw->intr);
633 err = (intr & ERROR_INTR)? in_8(&sw->error): 0;
634 if ((intr & ERROR_INTR) && fs->state != do_transfer)
635 printk(KERN_ERR "swim3_interrupt, state=%d, cmd=%x, intr=%x, err=%x\n",
636 fs->state, CURRENT->cmd, intr, err);
637 switch (fs->state) {
638 case locating:
639 if (intr & SEEN_SECTOR) {
640 out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);
641 out_8(&sw->select, RELAX);
642 out_8(&sw->intr_enable, 0);
643 del_timer(&fs->timeout);
644 fs->timeout_pending = 0;
645 if (sw->ctrack == 0xff) {
646 printk(KERN_ERR "swim3: seen sector but cyl=ff?\n");
647 fs->cur_cyl = -1;
648 if (fs->retries > 5) {
649 end_request(0);
650 fs->state = idle;
651 start_request(fs);
652 } else {
653 fs->state = jogging;
654 act(fs);
655 }
656 break;
657 }
658 fs->cur_cyl = sw->ctrack;
659 fs->cur_sector = sw->csect;
660 if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)
661 printk(KERN_ERR "swim3: expected cyl %d, got %d\n",
662 fs->expect_cyl, fs->cur_cyl);
663 fs->state = do_transfer;
664 act(fs);
665 }
666 break;
667 case seeking:
668 case jogging:
669 if (sw->nseek == 0) {
670 out_8(&sw->control_bic, DO_SEEK);
671 out_8(&sw->select, RELAX);
672 out_8(&sw->intr_enable, 0);
673 del_timer(&fs->timeout);
674 fs->timeout_pending = 0;
675 if (fs->state == seeking)
676 ++fs->retries;
677 fs->state = settling;
678 act(fs);
679 }
680 break;
681 case settling:
682 out_8(&sw->intr_enable, 0);
683 del_timer(&fs->timeout);
684 fs->timeout_pending = 0;
685 act(fs);
686 break;
687 case do_transfer:
688 if ((intr & (ERROR_INTR | TRANSFER_DONE)) == 0)
689 break;
690 out_8(&sw->intr_enable, 0);
691 out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
692 out_8(&sw->select, RELAX);
693 del_timer(&fs->timeout);
694 fs->timeout_pending = 0;
695 dr = fs->dma;
696 cp = fs->dma_cmd;
697 if (CURRENT->cmd == WRITE)
698 ++cp;
699 /*
700 * Check that the main data transfer has finished.
701 * On writing, the swim3 sometimes doesn't use
702 * up all the bytes of the postamble, so we can still
703 * see DMA active here. That doesn't matter as long
704 * as all the sector data has been transferred.
705 */
706 if ((intr & ERROR_INTR) == 0 && cp->xfer_status == 0) {
707 /* wait a little while for DMA to complete */
708 for (n = 0; n < 100; ++n) {
709 if (cp->xfer_status != 0)
710 break;
711 udelay(1);
712 barrier();
713 }
714 }
715 /* turn off DMA */
716 out_le32(&dr->control, (RUN | PAUSE) << 16);
717 stat = ld_le16(&cp->xfer_status);
718 resid = ld_le16(&cp->res_count);
719 if (intr & ERROR_INTR) {
720 n = fs->scount - 1 - resid / 512;
721 if (n > 0) {
722 CURRENT->sector += n;
723 CURRENT->current_nr_sectors -= n;
724 CURRENT->buffer += n * 512;
725 fs->req_sector += n;
726 }
727 if (fs->retries < 5) {
728 ++fs->retries;
729 act(fs);
730 } else {
731 printk("swim3: error %sing block %ld (err=%x)\n",
732 CURRENT->cmd == WRITE? "writ": "read",
733 CURRENT->sector, err);
734 end_request(0);
735 fs->state = idle;
736 }
737 } else {
738 if ((stat & ACTIVE) == 0 || resid != 0) {
739 /* musta been an error */
740 printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid);
741 printk(KERN_ERR " state=%d, cmd=%x, intr=%x, err=%x\n",
742 fs->state, CURRENT->cmd, intr, err);
743 end_request(0);
744 fs->state = idle;
745 start_request(fs);
746 break;
747 }
748 CURRENT->sector += fs->scount;
749 CURRENT->current_nr_sectors -= fs->scount;
750 CURRENT->buffer += fs->scount * 512;
751 if (CURRENT->current_nr_sectors <= 0) {
752 end_request(1);
753 fs->state = idle;
754 } else {
755 fs->req_sector += fs->scount;
756 if (fs->req_sector > fs->secpertrack) {
757 fs->req_sector -= fs->secpertrack;
758 if (++fs->head > 1) {
759 fs->head = 0;
760 ++fs->req_cyl;
761 }
762 }
763 act(fs);
764 }
765 }
766 if (fs->state == idle)
767 start_request(fs);
768 break;
769 default:
770 printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state);
771 }
772 }
773
774 /*
775 static void fd_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs)
776 {
777 }
778 */
779
grab_drive(struct floppy_state * fs,enum swim_state state,int interruptible)780 static int grab_drive(struct floppy_state *fs, enum swim_state state,
781 int interruptible)
782 {
783 unsigned long flags;
784
785 save_flags(flags);
786 cli();
787 if (fs->state != idle) {
788 ++fs->wanted;
789 while (fs->state != available) {
790 if (interruptible && signal_pending(current)) {
791 --fs->wanted;
792 restore_flags(flags);
793 return -EINTR;
794 }
795 interruptible_sleep_on(&fs->wait);
796 }
797 --fs->wanted;
798 }
799 fs->state = state;
800 restore_flags(flags);
801 return 0;
802 }
803
release_drive(struct floppy_state * fs)804 static void release_drive(struct floppy_state *fs)
805 {
806 unsigned long flags;
807
808 save_flags(flags);
809 cli();
810 fs->state = idle;
811 start_request(fs);
812 restore_flags(flags);
813 }
814
fd_eject(struct floppy_state * fs)815 static int fd_eject(struct floppy_state *fs)
816 {
817 int err, n;
818
819 err = grab_drive(fs, ejecting, 1);
820 if (err)
821 return err;
822 swim3_action(fs, EJECT);
823 for (n = 20; n > 0; --n) {
824 if (signal_pending(current)) {
825 err = -EINTR;
826 break;
827 }
828 swim3_select(fs, RELAX);
829 current->state = TASK_INTERRUPTIBLE;
830 schedule_timeout(1);
831 if (swim3_readbit(fs, DISK_IN) == 0)
832 break;
833 }
834 swim3_select(fs, RELAX);
835 udelay(150);
836 fs->ejected = 1;
837 release_drive(fs);
838 return err;
839 }
840
841 static struct floppy_struct floppy_type =
842 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL }; /* 7 1.44MB 3.5" */
843
floppy_ioctl(struct inode * inode,struct file * filp,unsigned int cmd,unsigned long param)844 static int floppy_ioctl(struct inode *inode, struct file *filp,
845 unsigned int cmd, unsigned long param)
846 {
847 struct floppy_state *fs;
848 int err;
849 int devnum = MINOR(inode->i_rdev);
850
851 if (devnum >= floppy_count)
852 return -ENODEV;
853
854 if ((cmd & 0x80) && !suser())
855 return -EPERM;
856
857 fs = &floppy_states[devnum];
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 *) param, (void *)&floppy_type,
870 sizeof(struct floppy_struct)))
871 return -EFAULT;
872 return 0;
873 }
874 return -ENOTTY;
875 }
876
floppy_open(struct inode * inode,struct file * filp)877 static int floppy_open(struct inode *inode, struct file *filp)
878 {
879 struct floppy_state *fs;
880 volatile struct swim3 *sw;
881 int n, err;
882 int devnum = MINOR(inode->i_rdev);
883
884 if (devnum >= floppy_count)
885 return -ENODEV;
886 if (filp == 0)
887 return -EIO;
888
889 fs = &floppy_states[devnum];
890 sw = fs->swim3;
891 err = 0;
892 if (fs->ref_count == 0) {
893 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
894 return -ENXIO;
895 out_8(&sw->setup, S_IBM_DRIVE | S_FCLK_DIV2);
896 out_8(&sw->control_bic, 0xff);
897 out_8(&sw->mode, 0x95);
898 udelay(10);
899 out_8(&sw->intr_enable, 0);
900 out_8(&sw->control_bis, DRIVE_ENABLE | INTR_ENABLE);
901 swim3_action(fs, MOTOR_ON);
902 fs->write_prot = -1;
903 fs->cur_cyl = -1;
904 for (n = 0; n < 2 * HZ; ++n) {
905 if (n >= HZ/30 && swim3_readbit(fs, SEEK_COMPLETE))
906 break;
907 if (signal_pending(current)) {
908 err = -EINTR;
909 break;
910 }
911 swim3_select(fs, RELAX);
912 current->state = TASK_INTERRUPTIBLE;
913 schedule_timeout(1);
914 }
915 if (err == 0 && (swim3_readbit(fs, SEEK_COMPLETE) == 0
916 || swim3_readbit(fs, DISK_IN) == 0))
917 err = -ENXIO;
918 swim3_action(fs, SETMFM);
919 swim3_select(fs, RELAX);
920
921 } else if (fs->ref_count == -1 || filp->f_flags & O_EXCL)
922 return -EBUSY;
923
924 if (err == 0 && (filp->f_flags & O_NDELAY) == 0
925 && (filp->f_mode & 3)) {
926 check_disk_change(inode->i_rdev);
927 if (fs->ejected)
928 err = -ENXIO;
929 }
930
931 if (err == 0 && (filp->f_mode & 2)) {
932 if (fs->write_prot < 0)
933 fs->write_prot = swim3_readbit(fs, WRITE_PROT);
934 if (fs->write_prot)
935 err = -EROFS;
936 }
937
938 if (err) {
939 if (fs->ref_count == 0) {
940 swim3_action(fs, MOTOR_OFF);
941 out_8(&sw->control_bic, DRIVE_ENABLE | INTR_ENABLE);
942 swim3_select(fs, RELAX);
943 }
944 return err;
945 }
946
947 if (filp->f_flags & O_EXCL)
948 fs->ref_count = -1;
949 else
950 ++fs->ref_count;
951
952 return 0;
953 }
954
floppy_release(struct inode * inode,struct file * filp)955 static int floppy_release(struct inode *inode, struct file *filp)
956 {
957 struct floppy_state *fs;
958 volatile struct swim3 *sw;
959 int devnum = MINOR(inode->i_rdev);
960
961 if (devnum >= floppy_count)
962 return -ENODEV;
963
964 fs = &floppy_states[devnum];
965 sw = fs->swim3;
966 if (fs->ref_count > 0 && --fs->ref_count == 0) {
967 swim3_action(fs, MOTOR_OFF);
968 out_8(&sw->control_bic, 0xff);
969 swim3_select(fs, RELAX);
970 }
971 return 0;
972 }
973
floppy_check_change(kdev_t dev)974 static int floppy_check_change(kdev_t dev)
975 {
976 struct floppy_state *fs;
977 int devnum = MINOR(dev);
978
979 if (MAJOR(dev) != MAJOR_NR || (devnum >= floppy_count))
980 return 0;
981
982 fs = &floppy_states[devnum];
983 return fs->ejected;
984 }
985
floppy_revalidate(kdev_t dev)986 static int floppy_revalidate(kdev_t dev)
987 {
988 struct floppy_state *fs;
989 volatile struct swim3 *sw;
990 int ret, n;
991 int devnum = MINOR(dev);
992
993 if (MAJOR(dev) != MAJOR_NR || (devnum >= floppy_count))
994 return 0;
995
996 fs = &floppy_states[devnum];
997
998 if (fs->media_bay && check_media_bay(fs->media_bay, MB_FD))
999 return -ENXIO;
1000
1001 sw = fs->swim3;
1002 grab_drive(fs, revalidating, 0);
1003 out_8(&sw->intr_enable, 0);
1004 out_8(&sw->control_bis, DRIVE_ENABLE);
1005 swim3_action(fs, MOTOR_ON); /* necessary? */
1006 fs->write_prot = -1;
1007 fs->cur_cyl = -1;
1008 mdelay(1);
1009 for (n = HZ; n > 0; --n) {
1010 if (swim3_readbit(fs, SEEK_COMPLETE))
1011 break;
1012 if (signal_pending(current))
1013 break;
1014 swim3_select(fs, RELAX);
1015 current->state = TASK_INTERRUPTIBLE;
1016 schedule_timeout(1);
1017 }
1018 ret = swim3_readbit(fs, SEEK_COMPLETE) == 0
1019 || swim3_readbit(fs, DISK_IN) == 0;
1020 if (ret)
1021 swim3_action(fs, MOTOR_OFF);
1022 else {
1023 fs->ejected = 0;
1024 swim3_action(fs, SETMFM);
1025 }
1026 swim3_select(fs, RELAX);
1027
1028 release_drive(fs);
1029 return ret;
1030 }
1031
floppy_off(unsigned int nr)1032 static void floppy_off(unsigned int nr)
1033 {
1034 }
1035
1036 static struct block_device_operations floppy_fops = {
1037 open: floppy_open,
1038 release: floppy_release,
1039 ioctl: floppy_ioctl,
1040 check_media_change: floppy_check_change,
1041 revalidate: floppy_revalidate,
1042 };
1043
1044 static devfs_handle_t floppy_devfs_handle;
1045
swim3_init(void)1046 int swim3_init(void)
1047 {
1048 struct device_node *swim;
1049
1050 floppy_devfs_handle = devfs_mk_dir(NULL, "floppy", NULL);
1051
1052 swim = find_devices("floppy");
1053 while (swim && (floppy_count < MAX_FLOPPIES))
1054 {
1055 swim3_add_device(swim);
1056 swim = swim->next;
1057 }
1058
1059 swim = find_devices("swim3");
1060 while (swim && (floppy_count < MAX_FLOPPIES))
1061 {
1062 swim3_add_device(swim);
1063 swim = swim->next;
1064 }
1065
1066 if (floppy_count > 0)
1067 {
1068 if (devfs_register_blkdev(MAJOR_NR, "fd", &floppy_fops)) {
1069 printk(KERN_ERR "Unable to get major %d for floppy\n",
1070 MAJOR_NR);
1071 return -EBUSY;
1072 }
1073 blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
1074 blksize_size[MAJOR_NR] = floppy_blocksizes;
1075 blk_size[MAJOR_NR] = floppy_sizes;
1076 }
1077
1078 return 0;
1079 }
1080
swim3_add_device(struct device_node * swim)1081 static int swim3_add_device(struct device_node *swim)
1082 {
1083 struct device_node *mediabay;
1084 struct floppy_state *fs = &floppy_states[floppy_count];
1085 char floppy_name[16];
1086 devfs_handle_t floppy_handle;
1087
1088 if (swim->n_addrs < 2)
1089 {
1090 printk(KERN_INFO "swim3: expecting 2 addrs (n_addrs:%d, n_intrs:%d)\n",
1091 swim->n_addrs, swim->n_intrs);
1092 return -EINVAL;
1093 }
1094
1095 if (swim->n_intrs < 2)
1096 {
1097 printk(KERN_INFO "swim3: expecting 2 intrs (n_addrs:%d, n_intrs:%d)\n",
1098 swim->n_addrs, swim->n_intrs);
1099 return -EINVAL;
1100 }
1101
1102 if (!request_OF_resource(swim, 0, NULL)) {
1103 printk(KERN_INFO "swim3: can't request IO resource !\n");
1104 return -EINVAL;
1105 }
1106
1107 mediabay = (strcasecmp(swim->parent->type, "media-bay") == 0) ? swim->parent : NULL;
1108 if (mediabay == NULL)
1109 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);
1110
1111 memset(fs, 0, sizeof(*fs));
1112 fs->state = idle;
1113 fs->swim3 = (volatile struct swim3 *) ioremap(swim->addrs[0].address, 0x200);
1114 fs->dma = (struct dbdma_regs *) ioremap(swim->addrs[1].address, 0x200);
1115 fs->swim3_intr = swim->intrs[0].line;
1116 fs->dma_intr = swim->intrs[1].line;
1117 fs->cur_cyl = -1;
1118 fs->cur_sector = -1;
1119 fs->secpercyl = 36;
1120 fs->secpertrack = 18;
1121 fs->total_secs = 2880;
1122 fs->media_bay = mediabay;
1123 init_waitqueue_head(&fs->wait);
1124
1125 fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);
1126 memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));
1127 st_le16(&fs->dma_cmd[1].command, DBDMA_STOP);
1128
1129 if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {
1130 printk(KERN_ERR "Couldn't get irq %d for SWIM3\n", fs->swim3_intr);
1131 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1132 return -EBUSY;
1133 }
1134 /*
1135 if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) {
1136 printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA",
1137 fs->dma_intr);
1138 pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);
1139 return -EBUSY;
1140 }
1141 */
1142
1143 init_timer(&fs->timeout);
1144
1145 do_floppy = NULL;
1146
1147 printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count,
1148 mediabay ? "in media bay" : "");
1149 sprintf(floppy_name, "%s%d", floppy_devfs_handle ? "" : "floppy",
1150 floppy_count);
1151 floppy_handle = devfs_register(floppy_devfs_handle, floppy_name,
1152 DEVFS_FL_DEFAULT, MAJOR_NR, floppy_count,
1153 S_IFBLK | S_IRUSR | S_IWUSR | S_IRGRP |S_IWGRP,
1154 &floppy_fops, NULL);
1155
1156 floppy_count++;
1157
1158 return 0;
1159 }
1160