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Linux 2.6.17.7
[linux/fpc-iii.git] / drivers / block / swim_iop.c
blob89e3c2f8b77681bacd376ba480732d4e84b97b9d
1 /*
2 * Driver for the SWIM (Super Woz Integrated Machine) IOP
3 * floppy controller on the Macintosh IIfx and Quadra 900/950
4 *
5 * Written by Joshua M. Thompson (funaho@jurai.org)
6 * based on the SWIM3 driver (c) 1996 by Paul Mackerras.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 *
13 * 1999-06-12 (jmt) - Initial implementation.
14 */
15
16 /*
17 * -------------------
18 * Theory of Operation
19 * -------------------
20 *
21 * Since the SWIM IOP is message-driven we implement a simple request queue
22 * system. One outstanding request may be queued at any given time (this is
23 * an IOP limitation); only when that request has completed can a new request
24 * be sent.
25 */
26
27 #include <linux/stddef.h>
28 #include <linux/kernel.h>
29 #include <linux/sched.h>
30 #include <linux/timer.h>
31 #include <linux/delay.h>
32 #include <linux/fd.h>
33 #include <linux/ioctl.h>
34 #include <linux/blkdev.h>
35 #include <asm/io.h>
36 #include <asm/uaccess.h>
37 #include <asm/mac_iop.h>
38 #include <asm/swim_iop.h>
39
40 #define DRIVER_VERSION "Version 0.1 (1999-06-12)"
41
42 #define MAX_FLOPPIES 4
43
44 enum swim_state {
45 idle,
46 available,
47 revalidating,
48 transferring,
49 ejecting
50 };
51
52 struct floppy_state {
53 enum swim_state state;
54 int drive_num; /* device number */
55 int secpercyl; /* disk geometry information */
56 int secpertrack;
57 int total_secs;
58 int write_prot; /* 1 if write-protected, 0 if not, -1 dunno */
59 int ref_count;
60 struct timer_list timeout;
61 int ejected;
62 struct wait_queue *wait;
63 int wanted;
64 int timeout_pending;
65 };
66
67 struct swim_iop_req {
68 int sent;
69 int complete;
70 __u8 command[32];
71 struct floppy_state *fs;
72 void (*done)(struct swim_iop_req *);
73 };
74
75 static struct swim_iop_req *current_req;
76 static int floppy_count;
77
78 static struct floppy_state floppy_states[MAX_FLOPPIES];
79 static DEFINE_SPINLOCK(swim_iop_lock);
80
81 #define CURRENT elv_next_request(swim_queue)
82
83 static char *drive_names[7] = {
84 "not installed", /* DRV_NONE */
85 "unknown (1)", /* DRV_UNKNOWN */
86 "a 400K drive", /* DRV_400K */
87 "an 800K drive" /* DRV_800K */
88 "unknown (4)", /* ???? */
89 "an FDHD", /* DRV_FDHD */
90 "unknown (6)", /* ???? */
91 "an Apple HD20" /* DRV_HD20 */
92 };
93
94 int swimiop_init(void);
95 static void swimiop_init_request(struct swim_iop_req *);
96 static int swimiop_send_request(struct swim_iop_req *);
97 static void swimiop_receive(struct iop_msg *, struct pt_regs *);
98 static void swimiop_status_update(int, struct swim_drvstatus *);
99 static int swimiop_eject(struct floppy_state *fs);
100
101 static int floppy_ioctl(struct inode *inode, struct file *filp,
102 unsigned int cmd, unsigned long param);
103 static int floppy_open(struct inode *inode, struct file *filp);
104 static int floppy_release(struct inode *inode, struct file *filp);
105 static int floppy_check_change(struct gendisk *disk);
106 static int floppy_revalidate(struct gendisk *disk);
107 static int grab_drive(struct floppy_state *fs, enum swim_state state,
108 int interruptible);
109 static void release_drive(struct floppy_state *fs);
110 static void set_timeout(struct floppy_state *fs, int nticks,
111 void (*proc)(unsigned long));
112 static void fd_request_timeout(unsigned long);
113 static void do_fd_request(request_queue_t * q);
114 static void start_request(struct floppy_state *fs);
115
116 static struct block_device_operations floppy_fops = {
117 .open = floppy_open,
118 .release = floppy_release,
119 .ioctl = floppy_ioctl,
120 .media_changed = floppy_check_change,
121 .revalidate_disk= floppy_revalidate,
122 };
123
124 static struct request_queue *swim_queue;
125 /*
126 * SWIM IOP initialization
127 */
128
129 int swimiop_init(void)
130 {
131 volatile struct swim_iop_req req;
132 struct swimcmd_status *cmd = (struct swimcmd_status *) &req.command[0];
133 struct swim_drvstatus *ds = &cmd->status;
134 struct floppy_state *fs;
135 int i;
136
137 current_req = NULL;
138 floppy_count = 0;
139
140 if (!iop_ism_present)
141 return -ENODEV;
142
143 if (register_blkdev(FLOPPY_MAJOR, "fd"))
144 return -EBUSY;
145
146 swim_queue = blk_init_queue(do_fd_request, &swim_iop_lock);
147 if (!swim_queue) {
148 unregister_blkdev(FLOPPY_MAJOR, "fd");
149 return -ENOMEM;
150 }
151
152 printk("SWIM-IOP: %s by Joshua M. Thompson (funaho@jurai.org)\n",
153 DRIVER_VERSION);
154
155 if (iop_listen(SWIM_IOP, SWIM_CHAN, swimiop_receive, "SWIM") != 0) {
156 printk(KERN_ERR "SWIM-IOP: IOP channel already in use; can't initialize.\n");
157 unregister_blkdev(FLOPPY_MAJOR, "fd");
158 blk_cleanup_queue(swim_queue);
159 return -EBUSY;
160 }
161
162 printk(KERN_ERR "SWIM_IOP: probing for installed drives.\n");
163
164 for (i = 0 ; i < MAX_FLOPPIES ; i++) {
165 memset(&floppy_states[i], 0, sizeof(struct floppy_state));
166 fs = &floppy_states[floppy_count];
167
168 swimiop_init_request(&req);
169 cmd->code = CMD_STATUS;
170 cmd->drive_num = i + 1;
171 if (swimiop_send_request(&req) != 0) continue;
172 while (!req.complete);
173 if (cmd->error != 0) {
174 printk(KERN_ERR "SWIM-IOP: probe on drive %d returned error %d\n", i, (uint) cmd->error);
175 continue;
176 }
177 if (ds->installed != 0x01) continue;
178 printk("SWIM-IOP: drive %d is %s (%s, %s, %s, %s)\n", i,
179 drive_names[ds->info.type],
180 ds->info.external? "ext" : "int",
181 ds->info.scsi? "scsi" : "floppy",
182 ds->info.fixed? "fixed" : "removable",
183 ds->info.secondary? "secondary" : "primary");
184 swimiop_status_update(floppy_count, ds);
185 fs->state = idle;
186
187 init_timer(&fs->timeout);
188 floppy_count++;
189 }
190 printk("SWIM-IOP: detected %d installed drives.\n", floppy_count);
191
192 for (i = 0; i < floppy_count; i++) {
193 struct gendisk *disk = alloc_disk(1);
194 if (!disk)
195 continue;
196 disk->major = FLOPPY_MAJOR;
197 disk->first_minor = i;
198 disk->fops = &floppy_fops;
199 sprintf(disk->disk_name, "fd%d", i);
200 disk->private_data = &floppy_states[i];
201 disk->queue = swim_queue;
202 set_capacity(disk, 2880 * 2);
203 add_disk(disk);
204 }
205
206 return 0;
207 }
208
209 static void swimiop_init_request(struct swim_iop_req *req)
210 {
211 req->sent = 0;
212 req->complete = 0;
213 req->done = NULL;
214 }
215
216 static int swimiop_send_request(struct swim_iop_req *req)
217 {
218 unsigned long flags;
219 int err;
220
221 /* It's doubtful an interrupt routine would try to send */
222 /* a SWIM request, but I'd rather play it safe here. */
223
224 local_irq_save(flags);
225
226 if (current_req != NULL) {
227 local_irq_restore(flags);
228 return -ENOMEM;
229 }
230
231 current_req = req;
232
233 /* Interrupts should be back on for iop_send_message() */
234
235 local_irq_restore(flags);
236
237 err = iop_send_message(SWIM_IOP, SWIM_CHAN, (void *) req,
238 sizeof(req->command), (__u8 *) &req->command[0],
239 swimiop_receive);
240
241 /* No race condition here; we own current_req at this point */
242
243 if (err) {
244 current_req = NULL;
245 } else {
246 req->sent = 1;
247 }
248 return err;
249 }
250
251 /*
252 * Receive a SWIM message from the IOP.
253 *
254 * This will be called in two cases:
255 *
256 * 1. A message has been successfully sent to the IOP.
257 * 2. An unsolicited message was received from the IOP.
258 */
259
260 void swimiop_receive(struct iop_msg *msg, struct pt_regs *regs)
261 {
262 struct swim_iop_req *req;
263 struct swimmsg_status *sm;
264 struct swim_drvstatus *ds;
265
266 req = current_req;
267
268 switch(msg->status) {
269 case IOP_MSGSTATUS_COMPLETE:
270 memcpy(&req->command[0], &msg->reply[0], sizeof(req->command));
271 req->complete = 1;
272 if (req->done) (*req->done)(req);
273 current_req = NULL;
274 break;
275 case IOP_MSGSTATUS_UNSOL:
276 sm = (struct swimmsg_status *) &msg->message[0];
277 ds = &sm->status;
278 swimiop_status_update(sm->drive_num, ds);
279 iop_complete_message(msg);
280 break;
281 }
282 }
283
284 static void swimiop_status_update(int drive_num, struct swim_drvstatus *ds)
285 {
286 struct floppy_state *fs = &floppy_states[drive_num];
287
288 fs->write_prot = (ds->write_prot == 0x80);
289 if ((ds->disk_in_drive != 0x01) && (ds->disk_in_drive != 0x02)) {
290 fs->ejected = 1;
291 } else {
292 fs->ejected = 0;
293 }
294 switch(ds->info.type) {
295 case DRV_400K:
296 fs->secpercyl = 10;
297 fs->secpertrack = 10;
298 fs->total_secs = 800;
299 break;
300 case DRV_800K:
301 fs->secpercyl = 20;
302 fs->secpertrack = 10;
303 fs->total_secs = 1600;
304 break;
305 case DRV_FDHD:
306 fs->secpercyl = 36;
307 fs->secpertrack = 18;
308 fs->total_secs = 2880;
309 break;
310 default:
311 fs->secpercyl = 0;
312 fs->secpertrack = 0;
313 fs->total_secs = 0;
314 break;
315 }
316 }
317
318 static int swimiop_eject(struct floppy_state *fs)
319 {
320 int err, n;
321 struct swim_iop_req req;
322 struct swimcmd_eject *cmd = (struct swimcmd_eject *) &req.command[0];
323
324 err = grab_drive(fs, ejecting, 1);
325 if (err) return err;
326
327 swimiop_init_request(&req);
328 cmd->code = CMD_EJECT;
329 cmd->drive_num = fs->drive_num;
330 err = swimiop_send_request(&req);
331 if (err) {
332 release_drive(fs);
333 return err;
334 }
335 for (n = 2*HZ; n > 0; --n) {
336 if (req.complete) break;
337 if (signal_pending(current)) {
338 err = -EINTR;
339 break;
340 }
341 schedule_timeout_interruptible(1);
342 }
343 release_drive(fs);
344 return cmd->error;
345 }
346
347 static struct floppy_struct floppy_type =
348 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL }; /* 7 1.44MB 3.5" */
349
350 static int floppy_ioctl(struct inode *inode, struct file *filp,
351 unsigned int cmd, unsigned long param)
352 {
353 struct floppy_state *fs = inode->i_bdev->bd_disk->private_data;
354 int err;
355
356 if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
357 return -EPERM;
358
359 switch (cmd) {
360 case FDEJECT:
361 if (fs->ref_count != 1)
362 return -EBUSY;
363 err = swimiop_eject(fs);
364 return err;
365 case FDGETPRM:
366 if (copy_to_user((void *) param, (void *) &floppy_type,
367 sizeof(struct floppy_struct)))
368 return -EFAULT;
369 return 0;
370 }
371 return -ENOTTY;
372 }
373
374 static int floppy_open(struct inode *inode, struct file *filp)
375 {
376 struct floppy_state *fs = inode->i_bdev->bd_disk->private_data;
377
378 if (fs->ref_count == -1 || filp->f_flags & O_EXCL)
379 return -EBUSY;
380
381 if ((filp->f_flags & O_NDELAY) == 0 && (filp->f_mode & 3)) {
382 check_disk_change(inode->i_bdev);
383 if (fs->ejected)
384 return -ENXIO;
385 }
386
387 if ((filp->f_mode & 2) && fs->write_prot)
388 return -EROFS;
389
390 if (filp->f_flags & O_EXCL)
391 fs->ref_count = -1;
392 else
393 ++fs->ref_count;
394
395 return 0;
396 }
397
398 static int floppy_release(struct inode *inode, struct file *filp)
399 {
400 struct floppy_state *fs = inode->i_bdev->bd_disk->private_data;
401 if (fs->ref_count > 0)
402 fs->ref_count--;
403 return 0;
404 }
405
406 static int floppy_check_change(struct gendisk *disk)
407 {
408 struct floppy_state *fs = disk->private_data;
409 return fs->ejected;
410 }
411
412 static int floppy_revalidate(struct gendisk *disk)
413 {
414 struct floppy_state *fs = disk->private_data;
415 grab_drive(fs, revalidating, 0);
416 /* yadda, yadda */
417 release_drive(fs);
418 return 0;
419 }
420
421 static void floppy_off(unsigned int nr)
422 {
423 }
424
425 static int grab_drive(struct floppy_state *fs, enum swim_state state,
426 int interruptible)
427 {
428 unsigned long flags;
429
430 local_irq_save(flags);
431 if (fs->state != idle) {
432 ++fs->wanted;
433 while (fs->state != available) {
434 if (interruptible && signal_pending(current)) {
435 --fs->wanted;
436 local_irq_restore(flags);
437 return -EINTR;
438 }
439 interruptible_sleep_on(&fs->wait);
440 }
441 --fs->wanted;
442 }
443 fs->state = state;
444 local_irq_restore(flags);
445 return 0;
446 }
447
448 static void release_drive(struct floppy_state *fs)
449 {
450 unsigned long flags;
451
452 local_irq_save(flags);
453 fs->state = idle;
454 start_request(fs);
455 local_irq_restore(flags);
456 }
457
458 static void set_timeout(struct floppy_state *fs, int nticks,
459 void (*proc)(unsigned long))
460 {
461 unsigned long flags;
462
463 local_irq_save(flags);
464 if (fs->timeout_pending)
465 del_timer(&fs->timeout);
466 init_timer(&fs->timeout);
467 fs->timeout.expires = jiffies + nticks;
468 fs->timeout.function = proc;
469 fs->timeout.data = (unsigned long) fs;
470 add_timer(&fs->timeout);
471 fs->timeout_pending = 1;
472 local_irq_restore(flags);
473 }
474
475 static void do_fd_request(request_queue_t * q)
476 {
477 int i;
478
479 for (i = 0 ; i < floppy_count ; i++) {
480 start_request(&floppy_states[i]);
481 }
482 }
483
484 static void fd_request_complete(struct swim_iop_req *req)
485 {
486 struct floppy_state *fs = req->fs;
487 struct swimcmd_rw *cmd = (struct swimcmd_rw *) &req->command[0];
488
489 del_timer(&fs->timeout);
490 fs->timeout_pending = 0;
491 fs->state = idle;
492 if (cmd->error) {
493 printk(KERN_ERR "SWIM-IOP: error %d on read/write request.\n", cmd->error);
494 end_request(CURRENT, 0);
495 } else {
496 CURRENT->sector += cmd->num_blocks;
497 CURRENT->current_nr_sectors -= cmd->num_blocks;
498 if (CURRENT->current_nr_sectors <= 0) {
499 end_request(CURRENT, 1);
500 return;
501 }
502 }
503 start_request(fs);
504 }
505
506 static void fd_request_timeout(unsigned long data)
507 {
508 struct floppy_state *fs = (struct floppy_state *) data;
509
510 fs->timeout_pending = 0;
511 end_request(CURRENT, 0);
512 fs->state = idle;
513 }
514
515 static void start_request(struct floppy_state *fs)
516 {
517 volatile struct swim_iop_req req;
518 struct swimcmd_rw *cmd = (struct swimcmd_rw *) &req.command[0];
519
520 if (fs->state == idle && fs->wanted) {
521 fs->state = available;
522 wake_up(&fs->wait);
523 return;
524 }
525 while (CURRENT && fs->state == idle) {
526 if (CURRENT->bh && !buffer_locked(CURRENT->bh))
527 panic("floppy: block not locked");
528 #if 0
529 printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%ld buf=%p\n",
530 CURRENT->rq_disk->disk_name, CURRENT->cmd,
531 CURRENT->sector, CURRENT->nr_sectors, CURRENT->buffer);
532 printk(" rq_status=%d errors=%d current_nr_sectors=%ld\n",
533 CURRENT->rq_status, CURRENT->errors, CURRENT->current_nr_sectors);
534 #endif
535
536 if (CURRENT->sector < 0 || CURRENT->sector >= fs->total_secs) {
537 end_request(CURRENT, 0);
538 continue;
539 }
540 if (CURRENT->current_nr_sectors == 0) {
541 end_request(CURRENT, 1);
542 continue;
543 }
544 if (fs->ejected) {
545 end_request(CURRENT, 0);
546 continue;
547 }
548
549 swimiop_init_request(&req);
550 req.fs = fs;
551 req.done = fd_request_complete;
552
553 if (CURRENT->cmd == WRITE) {
554 if (fs->write_prot) {
555 end_request(CURRENT, 0);
556 continue;
557 }
558 cmd->code = CMD_WRITE;
559 } else {
560 cmd->code = CMD_READ;
561
562 }
563 cmd->drive_num = fs->drive_num;
564 cmd->buffer = CURRENT->buffer;
565 cmd->first_block = CURRENT->sector;
566 cmd->num_blocks = CURRENT->current_nr_sectors;
567
568 if (swimiop_send_request(&req)) {
569 end_request(CURRENT, 0);
570 continue;
571 }
572
573 set_timeout(fs, HZ*CURRENT->current_nr_sectors,
574 fd_request_timeout);
575
576 fs->state = transferring;
577 }
578 }
Linux with added FPC-III support