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29#define MAJOR_NR FLOPPY_MAJOR
30
31#include <linux/stddef.h>
32#include <linux/kernel.h>
33#include <linux/sched.h>
34#include <linux/timer.h>
35#include <linux/delay.h>
36#include <linux/fd.h>
37#include <linux/blk.h>
38#include <linux/ioctl.h>
39#include <asm/io.h>
40#include <asm/uaccess.h>
41#include <asm/mac_iop.h>
42#include <asm/swim_iop.h>
43
44#define DRIVER_VERSION "Version 0.1 (1999-06-12)"
45
46#define MAX_FLOPPIES 4
47
48enum swim_state {
49 idle,
50 available,
51 revalidating,
52 transferring,
53 ejecting
54};
55
56struct floppy_state {
57 enum swim_state state;
58 int drive_num;
59 int secpercyl;
60 int secpertrack;
61 int total_secs;
62 int write_prot;
63 int ref_count;
64 struct timer_list timeout;
65 int ejected;
66 struct wait_queue *wait;
67 int wanted;
68 int timeout_pending;
69};
70
71struct swim_iop_req {
72 int sent;
73 int complete;
74 __u8 command[32];
75 struct floppy_state *fs;
76 void (*done)(struct swim_iop_req *);
77};
78
79static struct swim_iop_req *current_req;
80static int floppy_count;
81
82static struct floppy_state floppy_states[MAX_FLOPPIES];
83
84static int floppy_blocksizes[2] = {512,512};
85static int floppy_sizes[2] = {2880,2880};
86
87static char *drive_names[7] = {
88 "not installed",
89 "unknown (1)",
90 "a 400K drive",
91 "an 800K drive"
92 "unknown (4)",
93 "an FDHD",
94 "unknown (6)",
95 "an Apple HD20"
96};
97
98int swimiop_init(void);
99static void swimiop_init_request(struct swim_iop_req *);
100static int swimiop_send_request(struct swim_iop_req *);
101static void swimiop_receive(struct iop_msg *, struct pt_regs *);
102static void swimiop_status_update(int, struct swim_drvstatus *);
103static int swimiop_eject(struct floppy_state *fs);
104
105static int floppy_ioctl(struct inode *inode, struct file *filp,
106 unsigned int cmd, unsigned long param);
107static int floppy_open(struct inode *inode, struct file *filp);
108static int floppy_release(struct inode *inode, struct file *filp);
109static int floppy_check_change(kdev_t dev);
110static int floppy_revalidate(kdev_t dev);
111static int grab_drive(struct floppy_state *fs, enum swim_state state,
112 int interruptible);
113static void release_drive(struct floppy_state *fs);
114static void set_timeout(struct floppy_state *fs, int nticks,
115 void (*proc)(unsigned long));
116static void fd_request_timeout(unsigned long);
117static void do_fd_request(request_queue_t * q);
118static void start_request(struct floppy_state *fs);
119
120static struct block_device_operations floppy_fops = {
121 open: floppy_open,
122 release: floppy_release,
123 ioctl: floppy_ioctl,
124 check_media_change: floppy_check_change,
125 revalidate: floppy_revalidate,
126};
127
128
129
130
131
132int swimiop_init(void)
133{
134 volatile struct swim_iop_req req;
135 struct swimcmd_status *cmd = (struct swimcmd_status *) &req.command[0];
136 struct swim_drvstatus *ds = &cmd->status;
137 struct floppy_state *fs;
138 int i;
139
140 current_req = NULL;
141 floppy_count = 0;
142
143 if (!iop_ism_present) return -ENODEV;
144
145 if (register_blkdev(MAJOR_NR, "fd", &floppy_fops)) {
146 printk(KERN_ERR "SWIM-IOP: Unable to get major %d for floppy\n",
147 MAJOR_NR);
148 return -EBUSY;
149 }
150 blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
151 blksize_size[MAJOR_NR] = floppy_blocksizes;
152 blk_size[MAJOR_NR] = floppy_sizes;
153
154 printk("SWIM-IOP: %s by Joshua M. Thompson (funaho@jurai.org)\n",
155 DRIVER_VERSION);
156
157 if (iop_listen(SWIM_IOP, SWIM_CHAN, swimiop_receive, "SWIM") != 0) {
158 printk(KERN_ERR "SWIM-IOP: IOP channel already in use; can't initialize.\n");
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 do_floppy = NULL;
193
194 return 0;
195}
196
197static void swimiop_init_request(struct swim_iop_req *req)
198{
199 req->sent = 0;
200 req->complete = 0;
201 req->done = NULL;
202}
203
204static int swimiop_send_request(struct swim_iop_req *req)
205{
206 unsigned long cpu_flags;
207 int err;
208
209
210
211
212 save_flags(cpu_flags);
213 cli();
214
215 if (current_req != NULL) {
216 restore_flags(cpu_flags);
217 return -ENOMEM;
218 }
219
220 current_req = req;
221
222
223
224 restore_flags(cpu_flags);
225
226 err = iop_send_message(SWIM_IOP, SWIM_CHAN, (void *) req,
227 sizeof(req->command), (__u8 *) &req->command[0],
228 swimiop_receive);
229
230
231
232 if (err) {
233 current_req = NULL;
234 } else {
235 req->sent = 1;
236 }
237 return err;
238}
239
240
241
242
243
244
245
246
247
248
249void swimiop_receive(struct iop_msg *msg, struct pt_regs *regs)
250{
251 struct swim_iop_req *req;
252 struct swimmsg_status *sm;
253 struct swim_drvstatus *ds;
254
255 req = current_req;
256
257 switch(msg->status) {
258 case IOP_MSGSTATUS_COMPLETE:
259 memcpy(&req->command[0], &msg->reply[0], sizeof(req->command));
260 req->complete = 1;
261 if (req->done) (*req->done)(req);
262 current_req = NULL;
263 break;
264 case IOP_MSGSTATUS_UNSOL:
265 sm = (struct swimmsg_status *) &msg->message[0];
266 ds = &sm->status;
267 swimiop_status_update(sm->drive_num, ds);
268 iop_complete_message(msg);
269 break;
270 }
271}
272
273static void swimiop_status_update(int drive_num, struct swim_drvstatus *ds)
274{
275 struct floppy_state *fs = &floppy_states[drive_num];
276
277 fs->write_prot = (ds->write_prot == 0x80);
278 if ((ds->disk_in_drive != 0x01) && (ds->disk_in_drive != 0x02)) {
279 fs->ejected = 1;
280 } else {
281 fs->ejected = 0;
282 }
283 switch(ds->info.type) {
284 case DRV_400K:
285 fs->secpercyl = 10;
286 fs->secpertrack = 10;
287 fs->total_secs = 800;
288 break;
289 case DRV_800K:
290 fs->secpercyl = 20;
291 fs->secpertrack = 10;
292 fs->total_secs = 1600;
293 break;
294 case DRV_FDHD:
295 fs->secpercyl = 36;
296 fs->secpertrack = 18;
297 fs->total_secs = 2880;
298 break;
299 default:
300 fs->secpercyl = 0;
301 fs->secpertrack = 0;
302 fs->total_secs = 0;
303 break;
304 }
305}
306
307static int swimiop_eject(struct floppy_state *fs)
308{
309 int err, n;
310 struct swim_iop_req req;
311 struct swimcmd_eject *cmd = (struct swimcmd_eject *) &req.command[0];
312
313 err = grab_drive(fs, ejecting, 1);
314 if (err) return err;
315
316 swimiop_init_request(&req);
317 cmd->code = CMD_EJECT;
318 cmd->drive_num = fs->drive_num;
319 err = swimiop_send_request(&req);
320 if (err) {
321 release_drive(fs);
322 return err;
323 }
324 for (n = 2*HZ; n > 0; --n) {
325 if (req.complete) break;
326 if (signal_pending(current)) {
327 err = -EINTR;
328 break;
329 }
330 current->state = TASK_INTERRUPTIBLE;
331 schedule_timeout(1);
332 }
333 release_drive(fs);
334 return cmd->error;
335}
336
337static struct floppy_struct floppy_type =
338 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL };
339
340static int floppy_ioctl(struct inode *inode, struct file *filp,
341 unsigned int cmd, unsigned long param)
342{
343 struct floppy_state *fs;
344 int err;
345 int devnum = MINOR(inode->i_rdev);
346
347 if (devnum >= floppy_count)
348 return -ENODEV;
349
350 if ((cmd & 0x80) && !suser())
351 return -EPERM;
352
353 fs = &floppy_states[devnum];
354
355 switch (cmd) {
356 case FDEJECT:
357 if (fs->ref_count != 1)
358 return -EBUSY;
359 err = swimiop_eject(fs);
360 return err;
361 case FDGETPRM:
362 if (copy_to_user((void *) param, (void *) &floppy_type,
363 sizeof(struct floppy_struct)))
364 return -EFAULT;
365 return 0;
366 }
367 return -ENOTTY;
368}
369
370static int floppy_open(struct inode *inode, struct file *filp)
371{
372 struct floppy_state *fs;
373 int err;
374 int devnum = MINOR(inode->i_rdev);
375
376 if (devnum >= floppy_count)
377 return -ENODEV;
378 if (filp == 0)
379 return -EIO;
380
381 fs = &floppy_states[devnum];
382 err = 0;
383 if (fs->ref_count == -1 || filp->f_flags & O_EXCL) return -EBUSY;
384
385 if (err == 0 && (filp->f_flags & O_NDELAY) == 0
386 && (filp->f_mode & 3)) {
387 check_disk_change(inode->i_rdev);
388 if (fs->ejected)
389 err = -ENXIO;
390 }
391
392 if (err == 0 && (filp->f_mode & 2)) {
393 if (fs->write_prot)
394 err = -EROFS;
395 }
396
397 if (err) return err;
398
399 if (filp->f_flags & O_EXCL)
400 fs->ref_count = -1;
401 else
402 ++fs->ref_count;
403
404 return 0;
405}
406
407static int floppy_release(struct inode *inode, struct file *filp)
408{
409 struct floppy_state *fs;
410 int devnum = MINOR(inode->i_rdev);
411
412 if (devnum >= floppy_count)
413 return -ENODEV;
414
415 fs = &floppy_states[devnum];
416 if (fs->ref_count > 0) fs->ref_count--;
417 return 0;
418}
419
420static int floppy_check_change(kdev_t dev)
421{
422 struct floppy_state *fs;
423 int devnum = MINOR(dev);
424
425 if (MAJOR(dev) != MAJOR_NR || (devnum >= floppy_count))
426 return 0;
427
428 fs = &floppy_states[devnum];
429 return fs->ejected;
430}
431
432static int floppy_revalidate(kdev_t dev)
433{
434 struct floppy_state *fs;
435 int devnum = MINOR(dev);
436
437 if (MAJOR(dev) != MAJOR_NR || (devnum >= floppy_count))
438 return 0;
439
440 fs = &floppy_states[devnum];
441
442 grab_drive(fs, revalidating, 0);
443
444 release_drive(fs);
445
446 return 0;
447}
448
449static void floppy_off(unsigned int nr)
450{
451}
452
453static int grab_drive(struct floppy_state *fs, enum swim_state state,
454 int interruptible)
455{
456 unsigned long flags;
457
458 save_flags(flags);
459 cli();
460 if (fs->state != idle) {
461 ++fs->wanted;
462 while (fs->state != available) {
463 if (interruptible && signal_pending(current)) {
464 --fs->wanted;
465 restore_flags(flags);
466 return -EINTR;
467 }
468 interruptible_sleep_on(&fs->wait);
469 }
470 --fs->wanted;
471 }
472 fs->state = state;
473 restore_flags(flags);
474 return 0;
475}
476
477static void release_drive(struct floppy_state *fs)
478{
479 unsigned long flags;
480
481 save_flags(flags);
482 cli();
483 fs->state = idle;
484 start_request(fs);
485 restore_flags(flags);
486}
487
488static void set_timeout(struct floppy_state *fs, int nticks,
489 void (*proc)(unsigned long))
490{
491 unsigned long flags;
492
493 save_flags(flags); cli();
494 if (fs->timeout_pending)
495 del_timer(&fs->timeout);
496 fs->timeout.expires = jiffies + nticks;
497 fs->timeout.function = proc;
498 fs->timeout.data = (unsigned long) fs;
499 add_timer(&fs->timeout);
500 fs->timeout_pending = 1;
501 restore_flags(flags);
502}
503
504static void do_fd_request(request_queue_t * q)
505{
506 int i;
507
508 for (i = 0 ; i < floppy_count ; i++) {
509 start_request(&floppy_states[i]);
510 }
511}
512
513static void fd_request_complete(struct swim_iop_req *req)
514{
515 struct floppy_state *fs = req->fs;
516 struct swimcmd_rw *cmd = (struct swimcmd_rw *) &req->command[0];
517
518 del_timer(&fs->timeout);
519 fs->timeout_pending = 0;
520 fs->state = idle;
521 if (cmd->error) {
522 printk(KERN_ERR "SWIM-IOP: error %d on read/write request.\n", cmd->error);
523 end_request(0);
524 } else {
525 CURRENT->sector += cmd->num_blocks;
526 CURRENT->current_nr_sectors -= cmd->num_blocks;
527 if (CURRENT->current_nr_sectors <= 0) {
528 end_request(1);
529 return;
530 }
531 }
532 start_request(fs);
533}
534
535static void fd_request_timeout(unsigned long data)
536{
537 struct floppy_state *fs = (struct floppy_state *) data;
538
539 fs->timeout_pending = 0;
540 end_request(0);
541 fs->state = idle;
542}
543
544static void start_request(struct floppy_state *fs)
545{
546 volatile struct swim_iop_req req;
547 struct swimcmd_rw *cmd = (struct swimcmd_rw *) &req.command[0];
548
549 if (fs->state == idle && fs->wanted) {
550 fs->state = available;
551 wake_up(&fs->wait);
552 return;
553 }
554 while (!QUEUE_EMPTY && fs->state == idle) {
555 if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
556 panic(DEVICE_NAME ": request list destroyed");
557 if (CURRENT->bh && !buffer_locked(CURRENT->bh))
558 panic(DEVICE_NAME ": block not locked");
559#if 0
560 printk("do_fd_req: dev=%x cmd=%d sec=%ld nr_sec=%ld buf=%p\n",
561 kdev_t_to_nr(CURRENT->rq_dev), CURRENT->cmd,
562 CURRENT->sector, CURRENT->nr_sectors, CURRENT->buffer);
563 printk(" rq_status=%d errors=%d current_nr_sectors=%ld\n",
564 CURRENT->rq_status, CURRENT->errors, CURRENT->current_nr_sectors);
565#endif
566
567 if (CURRENT->sector < 0 || CURRENT->sector >= fs->total_secs) {
568 end_request(0);
569 continue;
570 }
571 if (CURRENT->current_nr_sectors == 0) {
572 end_request(1);
573 continue;
574 }
575 if (fs->ejected) {
576 end_request(0);
577 continue;
578 }
579
580 swimiop_init_request(&req);
581 req.fs = fs;
582 req.done = fd_request_complete;
583
584 if (CURRENT->cmd == WRITE) {
585 if (fs->write_prot) {
586 end_request(0);
587 continue;
588 }
589 cmd->code = CMD_WRITE;
590 } else {
591 cmd->code = CMD_READ;
592
593 }
594 cmd->drive_num = fs->drive_num;
595 cmd->buffer = CURRENT->buffer;
596 cmd->first_block = CURRENT->sector;
597 cmd->num_blocks = CURRENT->current_nr_sectors;
598
599 if (swimiop_send_request(&req)) {
600 end_request(0);
601 continue;
602 }
603
604 set_timeout(fs, HZ*CURRENT->current_nr_sectors,
605 fd_request_timeout);
606
607 fs->state = transferring;
608 }
609}
610
