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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/amiga/amiflop.c | |
3 | * | |
4 | * Copyright (C) 1993 Greg Harp | |
5 | * Portions of this driver are based on code contributed by Brad Pepers | |
6 | * | |
7 | * revised 28.5.95 by Joerg Dorchain | |
8 | * - now no bugs(?) any more for both HD & DD | |
9 | * - added support for 40 Track 5.25" drives, 80-track hopefully behaves | |
10 | * like 3.5" dd (no way to test - are there any 5.25" drives out there | |
11 | * that work on an A4000?) | |
12 | * - wrote formatting routine (maybe dirty, but works) | |
13 | * | |
14 | * june/july 1995 added ms-dos support by Joerg Dorchain | |
15 | * (portions based on messydos.device and various contributors) | |
16 | * - currently only 9 and 18 sector disks | |
17 | * | |
18 | * - fixed a bug with the internal trackbuffer when using multiple | |
19 | * disks the same time | |
20 | * - made formatting a bit safer | |
21 | * - added command line and machine based default for "silent" df0 | |
22 | * | |
23 | * december 1995 adapted for 1.2.13pl4 by Joerg Dorchain | |
24 | * - works but I think it's inefficient. (look in redo_fd_request) | |
25 | * But the changes were very efficient. (only three and a half lines) | |
26 | * | |
27 | * january 1996 added special ioctl for tracking down read/write problems | |
28 | * - usage ioctl(d, RAW_TRACK, ptr); the raw track buffer (MFM-encoded data | |
29 | * is copied to area. (area should be large enough since no checking is | |
30 | * done - 30K is currently sufficient). return the actual size of the | |
31 | * trackbuffer | |
32 | * - replaced udelays() by a timer (CIAA timer B) for the waits | |
33 | * needed for the disk mechanic. | |
34 | * | |
35 | * february 1996 fixed error recovery and multiple disk access | |
36 | * - both got broken the first time I tampered with the driver :-( | |
37 | * - still not safe, but better than before | |
38 | * | |
39 | * revised Marts 3rd, 1996 by Jes Sorensen for use in the 1.3.28 kernel. | |
40 | * - Minor changes to accept the kdev_t. | |
41 | * - Replaced some more udelays with ms_delays. Udelay is just a loop, | |
42 | * and so the delay will be different depending on the given | |
43 | * processor :-( | |
44 | * - The driver could use a major cleanup because of the new | |
45 | * major/minor handling that came with kdev_t. It seems to work for | |
46 | * the time being, but I can't guarantee that it will stay like | |
47 | * that when we start using 16 (24?) bit minors. | |
48 | * | |
49 | * restructured jan 1997 by Joerg Dorchain | |
50 | * - Fixed Bug accessing multiple disks | |
51 | * - some code cleanup | |
52 | * - added trackbuffer for each drive to speed things up | |
53 | * - fixed some race conditions (who finds the next may send it to me ;-) | |
54 | */ | |
55 | ||
56 | #include <linux/module.h> | |
5a0e3ad6 | 57 | #include <linux/slab.h> |
1da177e4 LT |
58 | |
59 | #include <linux/fd.h> | |
60 | #include <linux/hdreg.h> | |
61 | #include <linux/delay.h> | |
62 | #include <linux/init.h> | |
2a48fc0a | 63 | #include <linux/mutex.h> |
1da177e4 LT |
64 | #include <linux/amifdreg.h> |
65 | #include <linux/amifd.h> | |
66 | #include <linux/buffer_head.h> | |
67 | #include <linux/blkdev.h> | |
68 | #include <linux/elevator.h> | |
b5dc7840 | 69 | #include <linux/interrupt.h> |
92183b34 | 70 | #include <linux/platform_device.h> |
1da177e4 LT |
71 | |
72 | #include <asm/setup.h> | |
73 | #include <asm/uaccess.h> | |
74 | #include <asm/amigahw.h> | |
75 | #include <asm/amigaints.h> | |
76 | #include <asm/irq.h> | |
77 | ||
78 | #undef DEBUG /* print _LOTS_ of infos */ | |
79 | ||
80 | #define RAW_IOCTL | |
81 | #ifdef RAW_IOCTL | |
82 | #define IOCTL_RAW_TRACK 0x5254524B /* 'RTRK' */ | |
83 | #endif | |
84 | ||
85 | /* | |
86 | * Defines | |
87 | */ | |
88 | ||
89 | /* | |
90 | * Error codes | |
91 | */ | |
92 | #define FD_OK 0 /* operation succeeded */ | |
93 | #define FD_ERROR -1 /* general error (seek, read, write, etc) */ | |
94 | #define FD_NOUNIT 1 /* unit does not exist */ | |
95 | #define FD_UNITBUSY 2 /* unit already active */ | |
96 | #define FD_NOTACTIVE 3 /* unit is not active */ | |
97 | #define FD_NOTREADY 4 /* unit is not ready (motor not on/no disk) */ | |
98 | ||
99 | #define MFM_NOSYNC 1 | |
100 | #define MFM_HEADER 2 | |
101 | #define MFM_DATA 3 | |
102 | #define MFM_TRACK 4 | |
103 | ||
104 | /* | |
105 | * Floppy ID values | |
106 | */ | |
107 | #define FD_NODRIVE 0x00000000 /* response when no unit is present */ | |
108 | #define FD_DD_3 0xffffffff /* double-density 3.5" (880K) drive */ | |
109 | #define FD_HD_3 0x55555555 /* high-density 3.5" (1760K) drive */ | |
110 | #define FD_DD_5 0xaaaaaaaa /* double-density 5.25" (440K) drive */ | |
111 | ||
2a48fc0a | 112 | static DEFINE_MUTEX(amiflop_mutex); |
1da177e4 LT |
113 | static unsigned long int fd_def_df0 = FD_DD_3; /* default for df0 if it doesn't identify */ |
114 | ||
115 | module_param(fd_def_df0, ulong, 0); | |
116 | MODULE_LICENSE("GPL"); | |
117 | ||
118 | static struct request_queue *floppy_queue; | |
1da177e4 LT |
119 | |
120 | /* | |
121 | * Macros | |
122 | */ | |
123 | #define MOTOR_ON (ciab.prb &= ~DSKMOTOR) | |
124 | #define MOTOR_OFF (ciab.prb |= DSKMOTOR) | |
125 | #define SELECT(mask) (ciab.prb &= ~mask) | |
126 | #define DESELECT(mask) (ciab.prb |= mask) | |
127 | #define SELMASK(drive) (1 << (3 + (drive & 3))) | |
128 | ||
129 | static struct fd_drive_type drive_types[] = { | |
130 | /* code name tr he rdsz wrsz sm pc1 pc2 sd st st*/ | |
131 | /* warning: times are now in milliseconds (ms) */ | |
132 | { FD_DD_3, "DD 3.5", 80, 2, 14716, 13630, 1, 80,161, 3, 18, 1}, | |
133 | { FD_HD_3, "HD 3.5", 80, 2, 28344, 27258, 2, 80,161, 3, 18, 1}, | |
134 | { FD_DD_5, "DD 5.25", 40, 2, 14716, 13630, 1, 40, 81, 6, 30, 2}, | |
135 | { FD_NODRIVE, "No Drive", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} | |
136 | }; | |
945f390f | 137 | static int num_dr_types = ARRAY_SIZE(drive_types); |
1da177e4 LT |
138 | |
139 | static int amiga_read(int), dos_read(int); | |
140 | static void amiga_write(int), dos_write(int); | |
141 | static struct fd_data_type data_types[] = { | |
142 | { "Amiga", 11 , amiga_read, amiga_write}, | |
143 | { "MS-Dos", 9, dos_read, dos_write} | |
144 | }; | |
145 | ||
146 | /* current info on each unit */ | |
147 | static struct amiga_floppy_struct unit[FD_MAX_UNITS]; | |
148 | ||
149 | static struct timer_list flush_track_timer[FD_MAX_UNITS]; | |
150 | static struct timer_list post_write_timer; | |
151 | static struct timer_list motor_on_timer; | |
152 | static struct timer_list motor_off_timer[FD_MAX_UNITS]; | |
153 | static int on_attempts; | |
154 | ||
155 | /* Synchronization of FDC access */ | |
156 | /* request loop (trackbuffer) */ | |
157 | static volatile int fdc_busy = -1; | |
158 | static volatile int fdc_nested; | |
159 | static DECLARE_WAIT_QUEUE_HEAD(fdc_wait); | |
160 | ||
6d0be946 | 161 | static DECLARE_COMPLETION(motor_on_completion); |
1da177e4 LT |
162 | |
163 | static volatile int selected = -1; /* currently selected drive */ | |
164 | ||
165 | static int writepending; | |
166 | static int writefromint; | |
167 | static char *raw_buf; | |
168 | ||
169 | static DEFINE_SPINLOCK(amiflop_lock); | |
170 | ||
171 | #define RAW_BUF_SIZE 30000 /* size of raw disk data */ | |
172 | ||
173 | /* | |
174 | * These are global variables, as that's the easiest way to give | |
175 | * information to interrupts. They are the data used for the current | |
176 | * request. | |
177 | */ | |
178 | static volatile char block_flag; | |
179 | static DECLARE_WAIT_QUEUE_HEAD(wait_fd_block); | |
180 | ||
181 | /* MS-Dos MFM Coding tables (should go quick and easy) */ | |
182 | static unsigned char mfmencode[16]={ | |
183 | 0x2a, 0x29, 0x24, 0x25, 0x12, 0x11, 0x14, 0x15, | |
184 | 0x4a, 0x49, 0x44, 0x45, 0x52, 0x51, 0x54, 0x55 | |
185 | }; | |
186 | static unsigned char mfmdecode[128]; | |
187 | ||
188 | /* floppy internal millisecond timer stuff */ | |
6d0be946 | 189 | static DECLARE_COMPLETION(ms_wait_completion); |
1da177e4 LT |
190 | #define MS_TICKS ((amiga_eclock+50)/1000) |
191 | ||
192 | /* | |
193 | * Note that MAX_ERRORS=X doesn't imply that we retry every bad read | |
194 | * max X times - some types of errors increase the errorcount by 2 or | |
195 | * even 3, so we might actually retry only X/2 times before giving up. | |
196 | */ | |
197 | #define MAX_ERRORS 12 | |
198 | ||
b4290a23 AV |
199 | #define custom amiga_custom |
200 | ||
1da177e4 LT |
201 | /* Prevent "aliased" accesses. */ |
202 | static int fd_ref[4] = { 0,0,0,0 }; | |
203 | static int fd_device[4] = { 0, 0, 0, 0 }; | |
204 | ||
205 | /* | |
206 | * Here come the actual hardware access and helper functions. | |
207 | * They are not reentrant and single threaded because all drives | |
208 | * share the same hardware and the same trackbuffer. | |
209 | */ | |
210 | ||
211 | /* Milliseconds timer */ | |
212 | ||
7d12e780 | 213 | static irqreturn_t ms_isr(int irq, void *dummy) |
1da177e4 | 214 | { |
6d0be946 | 215 | complete(&ms_wait_completion); |
1da177e4 LT |
216 | return IRQ_HANDLED; |
217 | } | |
218 | ||
219 | /* all waits are queued up | |
220 | A more generic routine would do a schedule a la timer.device */ | |
221 | static void ms_delay(int ms) | |
222 | { | |
1da177e4 | 223 | int ticks; |
6d0be946 AB |
224 | static DEFINE_MUTEX(mutex); |
225 | ||
1da177e4 | 226 | if (ms > 0) { |
6d0be946 | 227 | mutex_lock(&mutex); |
1da177e4 LT |
228 | ticks = MS_TICKS*ms-1; |
229 | ciaa.tblo=ticks%256; | |
230 | ciaa.tbhi=ticks/256; | |
231 | ciaa.crb=0x19; /*count eclock, force load, one-shoot, start */ | |
6d0be946 AB |
232 | wait_for_completion(&ms_wait_completion); |
233 | mutex_unlock(&mutex); | |
1da177e4 LT |
234 | } |
235 | } | |
236 | ||
237 | /* Hardware semaphore */ | |
238 | ||
239 | /* returns true when we would get the semaphore */ | |
240 | static inline int try_fdc(int drive) | |
241 | { | |
242 | drive &= 3; | |
243 | return ((fdc_busy < 0) || (fdc_busy == drive)); | |
244 | } | |
245 | ||
246 | static void get_fdc(int drive) | |
247 | { | |
248 | unsigned long flags; | |
249 | ||
250 | drive &= 3; | |
251 | #ifdef DEBUG | |
252 | printk("get_fdc: drive %d fdc_busy %d fdc_nested %d\n",drive,fdc_busy,fdc_nested); | |
253 | #endif | |
254 | local_irq_save(flags); | |
6d0be946 | 255 | wait_event(fdc_wait, try_fdc(drive)); |
1da177e4 LT |
256 | fdc_busy = drive; |
257 | fdc_nested++; | |
258 | local_irq_restore(flags); | |
259 | } | |
260 | ||
261 | static inline void rel_fdc(void) | |
262 | { | |
263 | #ifdef DEBUG | |
264 | if (fdc_nested == 0) | |
265 | printk("fd: unmatched rel_fdc\n"); | |
266 | printk("rel_fdc: fdc_busy %d fdc_nested %d\n",fdc_busy,fdc_nested); | |
267 | #endif | |
268 | fdc_nested--; | |
269 | if (fdc_nested == 0) { | |
270 | fdc_busy = -1; | |
271 | wake_up(&fdc_wait); | |
272 | } | |
273 | } | |
274 | ||
275 | static void fd_select (int drive) | |
276 | { | |
277 | unsigned char prb = ~0; | |
278 | ||
279 | drive&=3; | |
280 | #ifdef DEBUG | |
281 | printk("selecting %d\n",drive); | |
282 | #endif | |
283 | if (drive == selected) | |
284 | return; | |
285 | get_fdc(drive); | |
286 | selected = drive; | |
287 | ||
288 | if (unit[drive].track % 2 != 0) | |
289 | prb &= ~DSKSIDE; | |
290 | if (unit[drive].motor == 1) | |
291 | prb &= ~DSKMOTOR; | |
292 | ciab.prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3)); | |
293 | ciab.prb = prb; | |
294 | prb &= ~SELMASK(drive); | |
295 | ciab.prb = prb; | |
296 | rel_fdc(); | |
297 | } | |
298 | ||
299 | static void fd_deselect (int drive) | |
300 | { | |
301 | unsigned char prb; | |
302 | unsigned long flags; | |
303 | ||
304 | drive&=3; | |
305 | #ifdef DEBUG | |
306 | printk("deselecting %d\n",drive); | |
307 | #endif | |
308 | if (drive != selected) { | |
309 | printk(KERN_WARNING "Deselecting drive %d while %d was selected!\n",drive,selected); | |
310 | return; | |
311 | } | |
312 | ||
313 | get_fdc(drive); | |
314 | local_irq_save(flags); | |
315 | ||
316 | selected = -1; | |
317 | ||
318 | prb = ciab.prb; | |
319 | prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3)); | |
320 | ciab.prb = prb; | |
321 | ||
322 | local_irq_restore (flags); | |
323 | rel_fdc(); | |
324 | ||
325 | } | |
326 | ||
327 | static void motor_on_callback(unsigned long nr) | |
328 | { | |
329 | if (!(ciaa.pra & DSKRDY) || --on_attempts == 0) { | |
6d0be946 | 330 | complete_all(&motor_on_completion); |
1da177e4 LT |
331 | } else { |
332 | motor_on_timer.expires = jiffies + HZ/10; | |
333 | add_timer(&motor_on_timer); | |
334 | } | |
335 | } | |
336 | ||
337 | static int fd_motor_on(int nr) | |
338 | { | |
339 | nr &= 3; | |
340 | ||
341 | del_timer(motor_off_timer + nr); | |
342 | ||
343 | if (!unit[nr].motor) { | |
344 | unit[nr].motor = 1; | |
345 | fd_select(nr); | |
346 | ||
6d0be946 | 347 | INIT_COMPLETION(motor_on_completion); |
1da177e4 LT |
348 | motor_on_timer.data = nr; |
349 | mod_timer(&motor_on_timer, jiffies + HZ/2); | |
350 | ||
351 | on_attempts = 10; | |
6d0be946 | 352 | wait_for_completion(&motor_on_completion); |
1da177e4 LT |
353 | fd_deselect(nr); |
354 | } | |
355 | ||
356 | if (on_attempts == 0) { | |
357 | on_attempts = -1; | |
358 | #if 0 | |
359 | printk (KERN_ERR "motor_on failed, turning motor off\n"); | |
360 | fd_motor_off (nr); | |
361 | return 0; | |
362 | #else | |
363 | printk (KERN_WARNING "DSKRDY not set after 1.5 seconds - assuming drive is spinning notwithstanding\n"); | |
364 | #endif | |
365 | } | |
366 | ||
367 | return 1; | |
368 | } | |
369 | ||
370 | static void fd_motor_off(unsigned long drive) | |
371 | { | |
372 | long calledfromint; | |
373 | #ifdef MODULE | |
374 | long decusecount; | |
375 | ||
376 | decusecount = drive & 0x40000000; | |
377 | #endif | |
378 | calledfromint = drive & 0x80000000; | |
379 | drive&=3; | |
380 | if (calledfromint && !try_fdc(drive)) { | |
381 | /* We would be blocked in an interrupt, so try again later */ | |
382 | motor_off_timer[drive].expires = jiffies + 1; | |
383 | add_timer(motor_off_timer + drive); | |
384 | return; | |
385 | } | |
386 | unit[drive].motor = 0; | |
387 | fd_select(drive); | |
388 | udelay (1); | |
389 | fd_deselect(drive); | |
390 | } | |
391 | ||
392 | static void floppy_off (unsigned int nr) | |
393 | { | |
394 | int drive; | |
395 | ||
396 | drive = nr & 3; | |
397 | /* called this way it is always from interrupt */ | |
398 | motor_off_timer[drive].data = nr | 0x80000000; | |
399 | mod_timer(motor_off_timer + drive, jiffies + 3*HZ); | |
400 | } | |
401 | ||
402 | static int fd_calibrate(int drive) | |
403 | { | |
404 | unsigned char prb; | |
405 | int n; | |
406 | ||
407 | drive &= 3; | |
408 | get_fdc(drive); | |
409 | if (!fd_motor_on (drive)) | |
410 | return 0; | |
411 | fd_select (drive); | |
412 | prb = ciab.prb; | |
413 | prb |= DSKSIDE; | |
414 | prb &= ~DSKDIREC; | |
415 | ciab.prb = prb; | |
416 | for (n = unit[drive].type->tracks/2; n != 0; --n) { | |
417 | if (ciaa.pra & DSKTRACK0) | |
418 | break; | |
419 | prb &= ~DSKSTEP; | |
420 | ciab.prb = prb; | |
421 | prb |= DSKSTEP; | |
422 | udelay (2); | |
423 | ciab.prb = prb; | |
424 | ms_delay(unit[drive].type->step_delay); | |
425 | } | |
426 | ms_delay (unit[drive].type->settle_time); | |
427 | prb |= DSKDIREC; | |
428 | n = unit[drive].type->tracks + 20; | |
429 | for (;;) { | |
430 | prb &= ~DSKSTEP; | |
431 | ciab.prb = prb; | |
432 | prb |= DSKSTEP; | |
433 | udelay (2); | |
434 | ciab.prb = prb; | |
435 | ms_delay(unit[drive].type->step_delay + 1); | |
436 | if ((ciaa.pra & DSKTRACK0) == 0) | |
437 | break; | |
438 | if (--n == 0) { | |
439 | printk (KERN_ERR "fd%d: calibrate failed, turning motor off\n", drive); | |
440 | fd_motor_off (drive); | |
441 | unit[drive].track = -1; | |
442 | rel_fdc(); | |
443 | return 0; | |
444 | } | |
445 | } | |
446 | unit[drive].track = 0; | |
447 | ms_delay(unit[drive].type->settle_time); | |
448 | ||
449 | rel_fdc(); | |
450 | fd_deselect(drive); | |
451 | return 1; | |
452 | } | |
453 | ||
454 | static int fd_seek(int drive, int track) | |
455 | { | |
456 | unsigned char prb; | |
457 | int cnt; | |
458 | ||
459 | #ifdef DEBUG | |
460 | printk("seeking drive %d to track %d\n",drive,track); | |
461 | #endif | |
462 | drive &= 3; | |
463 | get_fdc(drive); | |
464 | if (unit[drive].track == track) { | |
465 | rel_fdc(); | |
466 | return 1; | |
467 | } | |
468 | if (!fd_motor_on(drive)) { | |
469 | rel_fdc(); | |
470 | return 0; | |
471 | } | |
472 | if (unit[drive].track < 0 && !fd_calibrate(drive)) { | |
473 | rel_fdc(); | |
474 | return 0; | |
475 | } | |
476 | ||
477 | fd_select (drive); | |
478 | cnt = unit[drive].track/2 - track/2; | |
479 | prb = ciab.prb; | |
480 | prb |= DSKSIDE | DSKDIREC; | |
481 | if (track % 2 != 0) | |
482 | prb &= ~DSKSIDE; | |
483 | if (cnt < 0) { | |
484 | cnt = - cnt; | |
485 | prb &= ~DSKDIREC; | |
486 | } | |
487 | ciab.prb = prb; | |
488 | if (track % 2 != unit[drive].track % 2) | |
489 | ms_delay (unit[drive].type->side_time); | |
490 | unit[drive].track = track; | |
491 | if (cnt == 0) { | |
492 | rel_fdc(); | |
493 | fd_deselect(drive); | |
494 | return 1; | |
495 | } | |
496 | do { | |
497 | prb &= ~DSKSTEP; | |
498 | ciab.prb = prb; | |
499 | prb |= DSKSTEP; | |
500 | udelay (1); | |
501 | ciab.prb = prb; | |
502 | ms_delay (unit[drive].type->step_delay); | |
503 | } while (--cnt != 0); | |
504 | ms_delay (unit[drive].type->settle_time); | |
505 | ||
506 | rel_fdc(); | |
507 | fd_deselect(drive); | |
508 | return 1; | |
509 | } | |
510 | ||
511 | static unsigned long fd_get_drive_id(int drive) | |
512 | { | |
513 | int i; | |
514 | ulong id = 0; | |
515 | ||
516 | drive&=3; | |
517 | get_fdc(drive); | |
518 | /* set up for ID */ | |
519 | MOTOR_ON; | |
520 | udelay(2); | |
521 | SELECT(SELMASK(drive)); | |
522 | udelay(2); | |
523 | DESELECT(SELMASK(drive)); | |
524 | udelay(2); | |
525 | MOTOR_OFF; | |
526 | udelay(2); | |
527 | SELECT(SELMASK(drive)); | |
528 | udelay(2); | |
529 | DESELECT(SELMASK(drive)); | |
530 | udelay(2); | |
531 | ||
532 | /* loop and read disk ID */ | |
533 | for (i=0; i<32; i++) { | |
534 | SELECT(SELMASK(drive)); | |
535 | udelay(2); | |
536 | ||
537 | /* read and store value of DSKRDY */ | |
538 | id <<= 1; | |
539 | id |= (ciaa.pra & DSKRDY) ? 0 : 1; /* cia regs are low-active! */ | |
540 | ||
541 | DESELECT(SELMASK(drive)); | |
542 | } | |
543 | ||
544 | rel_fdc(); | |
545 | ||
546 | /* | |
547 | * RB: At least A500/A2000's df0: don't identify themselves. | |
548 | * As every (real) Amiga has at least a 3.5" DD drive as df0: | |
549 | * we default to that if df0: doesn't identify as a certain | |
550 | * type. | |
551 | */ | |
552 | if(drive == 0 && id == FD_NODRIVE) | |
553 | { | |
554 | id = fd_def_df0; | |
555 | printk(KERN_NOTICE "fd: drive 0 didn't identify, setting default %08lx\n", (ulong)fd_def_df0); | |
556 | } | |
557 | /* return the ID value */ | |
558 | return (id); | |
559 | } | |
560 | ||
7d12e780 | 561 | static irqreturn_t fd_block_done(int irq, void *dummy) |
1da177e4 LT |
562 | { |
563 | if (block_flag) | |
564 | custom.dsklen = 0x4000; | |
565 | ||
566 | if (block_flag == 2) { /* writing */ | |
567 | writepending = 2; | |
568 | post_write_timer.expires = jiffies + 1; /* at least 2 ms */ | |
569 | post_write_timer.data = selected; | |
570 | add_timer(&post_write_timer); | |
571 | } | |
572 | else { /* reading */ | |
573 | block_flag = 0; | |
574 | wake_up (&wait_fd_block); | |
575 | } | |
576 | return IRQ_HANDLED; | |
577 | } | |
578 | ||
579 | static void raw_read(int drive) | |
580 | { | |
581 | drive&=3; | |
582 | get_fdc(drive); | |
6d0be946 | 583 | wait_event(wait_fd_block, !block_flag); |
1da177e4 LT |
584 | fd_select(drive); |
585 | /* setup adkcon bits correctly */ | |
586 | custom.adkcon = ADK_MSBSYNC; | |
587 | custom.adkcon = ADK_SETCLR|ADK_WORDSYNC|ADK_FAST; | |
588 | ||
589 | custom.dsksync = MFM_SYNC; | |
590 | ||
591 | custom.dsklen = 0; | |
592 | custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf); | |
593 | custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN; | |
594 | custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN; | |
595 | ||
596 | block_flag = 1; | |
597 | ||
6d0be946 | 598 | wait_event(wait_fd_block, !block_flag); |
1da177e4 LT |
599 | |
600 | custom.dsklen = 0; | |
601 | fd_deselect(drive); | |
602 | rel_fdc(); | |
603 | } | |
604 | ||
605 | static int raw_write(int drive) | |
606 | { | |
607 | ushort adk; | |
608 | ||
609 | drive&=3; | |
610 | get_fdc(drive); /* corresponds to rel_fdc() in post_write() */ | |
611 | if ((ciaa.pra & DSKPROT) == 0) { | |
612 | rel_fdc(); | |
613 | return 0; | |
614 | } | |
6d0be946 | 615 | wait_event(wait_fd_block, !block_flag); |
1da177e4 LT |
616 | fd_select(drive); |
617 | /* clear adkcon bits */ | |
618 | custom.adkcon = ADK_PRECOMP1|ADK_PRECOMP0|ADK_WORDSYNC|ADK_MSBSYNC; | |
619 | /* set appropriate adkcon bits */ | |
620 | adk = ADK_SETCLR|ADK_FAST; | |
621 | if ((ulong)unit[drive].track >= unit[drive].type->precomp2) | |
622 | adk |= ADK_PRECOMP1; | |
623 | else if ((ulong)unit[drive].track >= unit[drive].type->precomp1) | |
624 | adk |= ADK_PRECOMP0; | |
625 | custom.adkcon = adk; | |
626 | ||
627 | custom.dsklen = DSKLEN_WRITE; | |
628 | custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf); | |
629 | custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE; | |
630 | custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE; | |
631 | ||
632 | block_flag = 2; | |
633 | return 1; | |
634 | } | |
635 | ||
636 | /* | |
637 | * to be called at least 2ms after the write has finished but before any | |
638 | * other access to the hardware. | |
639 | */ | |
640 | static void post_write (unsigned long drive) | |
641 | { | |
642 | #ifdef DEBUG | |
643 | printk("post_write for drive %ld\n",drive); | |
644 | #endif | |
645 | drive &= 3; | |
646 | custom.dsklen = 0; | |
647 | block_flag = 0; | |
648 | writepending = 0; | |
649 | writefromint = 0; | |
650 | unit[drive].dirty = 0; | |
651 | wake_up(&wait_fd_block); | |
652 | fd_deselect(drive); | |
653 | rel_fdc(); /* corresponds to get_fdc() in raw_write */ | |
654 | } | |
655 | ||
656 | ||
657 | /* | |
658 | * The following functions are to convert the block contents into raw data | |
659 | * written to disk and vice versa. | |
660 | * (Add other formats here ;-)) | |
661 | */ | |
662 | ||
663 | static unsigned long scan_sync(unsigned long raw, unsigned long end) | |
664 | { | |
665 | ushort *ptr = (ushort *)raw, *endp = (ushort *)end; | |
666 | ||
667 | while (ptr < endp && *ptr++ != 0x4489) | |
668 | ; | |
669 | if (ptr < endp) { | |
670 | while (*ptr == 0x4489 && ptr < endp) | |
671 | ptr++; | |
672 | return (ulong)ptr; | |
673 | } | |
674 | return 0; | |
675 | } | |
676 | ||
677 | static inline unsigned long checksum(unsigned long *addr, int len) | |
678 | { | |
679 | unsigned long csum = 0; | |
680 | ||
681 | len /= sizeof(*addr); | |
682 | while (len-- > 0) | |
683 | csum ^= *addr++; | |
684 | csum = ((csum>>1) & 0x55555555) ^ (csum & 0x55555555); | |
685 | ||
686 | return csum; | |
687 | } | |
688 | ||
689 | static unsigned long decode (unsigned long *data, unsigned long *raw, | |
690 | int len) | |
691 | { | |
692 | ulong *odd, *even; | |
693 | ||
694 | /* convert length from bytes to longwords */ | |
695 | len >>= 2; | |
696 | odd = raw; | |
697 | even = odd + len; | |
698 | ||
699 | /* prepare return pointer */ | |
700 | raw += len * 2; | |
701 | ||
702 | do { | |
703 | *data++ = ((*odd++ & 0x55555555) << 1) | (*even++ & 0x55555555); | |
704 | } while (--len != 0); | |
705 | ||
706 | return (ulong)raw; | |
707 | } | |
708 | ||
709 | struct header { | |
710 | unsigned char magic; | |
711 | unsigned char track; | |
712 | unsigned char sect; | |
713 | unsigned char ord; | |
714 | unsigned char labels[16]; | |
715 | unsigned long hdrchk; | |
716 | unsigned long datachk; | |
717 | }; | |
718 | ||
719 | static int amiga_read(int drive) | |
720 | { | |
721 | unsigned long raw; | |
722 | unsigned long end; | |
723 | int scnt; | |
724 | unsigned long csum; | |
725 | struct header hdr; | |
726 | ||
727 | drive&=3; | |
728 | raw = (long) raw_buf; | |
729 | end = raw + unit[drive].type->read_size; | |
730 | ||
731 | for (scnt = 0;scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) { | |
732 | if (!(raw = scan_sync(raw, end))) { | |
733 | printk (KERN_INFO "can't find sync for sector %d\n", scnt); | |
734 | return MFM_NOSYNC; | |
735 | } | |
736 | ||
737 | raw = decode ((ulong *)&hdr.magic, (ulong *)raw, 4); | |
738 | raw = decode ((ulong *)&hdr.labels, (ulong *)raw, 16); | |
739 | raw = decode ((ulong *)&hdr.hdrchk, (ulong *)raw, 4); | |
740 | raw = decode ((ulong *)&hdr.datachk, (ulong *)raw, 4); | |
741 | csum = checksum((ulong *)&hdr, | |
742 | (char *)&hdr.hdrchk-(char *)&hdr); | |
743 | ||
744 | #ifdef DEBUG | |
745 | printk ("(%x,%d,%d,%d) (%lx,%lx,%lx,%lx) %lx %lx\n", | |
746 | hdr.magic, hdr.track, hdr.sect, hdr.ord, | |
747 | *(ulong *)&hdr.labels[0], *(ulong *)&hdr.labels[4], | |
748 | *(ulong *)&hdr.labels[8], *(ulong *)&hdr.labels[12], | |
749 | hdr.hdrchk, hdr.datachk); | |
750 | #endif | |
751 | ||
752 | if (hdr.hdrchk != csum) { | |
753 | printk(KERN_INFO "MFM_HEADER: %08lx,%08lx\n", hdr.hdrchk, csum); | |
754 | return MFM_HEADER; | |
755 | } | |
756 | ||
757 | /* verify track */ | |
758 | if (hdr.track != unit[drive].track) { | |
759 | printk(KERN_INFO "MFM_TRACK: %d, %d\n", hdr.track, unit[drive].track); | |
760 | return MFM_TRACK; | |
761 | } | |
762 | ||
763 | raw = decode ((ulong *)(unit[drive].trackbuf + hdr.sect*512), | |
764 | (ulong *)raw, 512); | |
765 | csum = checksum((ulong *)(unit[drive].trackbuf + hdr.sect*512), 512); | |
766 | ||
767 | if (hdr.datachk != csum) { | |
768 | printk(KERN_INFO "MFM_DATA: (%x:%d:%d:%d) sc=%d %lx, %lx\n", | |
769 | hdr.magic, hdr.track, hdr.sect, hdr.ord, scnt, | |
770 | hdr.datachk, csum); | |
771 | printk (KERN_INFO "data=(%lx,%lx,%lx,%lx)\n", | |
772 | ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[0], | |
773 | ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[1], | |
774 | ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[2], | |
775 | ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[3]); | |
776 | return MFM_DATA; | |
777 | } | |
778 | } | |
779 | ||
780 | return 0; | |
781 | } | |
782 | ||
783 | static void encode(unsigned long data, unsigned long *dest) | |
784 | { | |
785 | unsigned long data2; | |
786 | ||
787 | data &= 0x55555555; | |
788 | data2 = data ^ 0x55555555; | |
789 | data |= ((data2 >> 1) | 0x80000000) & (data2 << 1); | |
790 | ||
791 | if (*(dest - 1) & 0x00000001) | |
792 | data &= 0x7FFFFFFF; | |
793 | ||
794 | *dest = data; | |
795 | } | |
796 | ||
797 | static void encode_block(unsigned long *dest, unsigned long *src, int len) | |
798 | { | |
799 | int cnt, to_cnt = 0; | |
800 | unsigned long data; | |
801 | ||
802 | /* odd bits */ | |
803 | for (cnt = 0; cnt < len / 4; cnt++) { | |
804 | data = src[cnt] >> 1; | |
805 | encode(data, dest + to_cnt++); | |
806 | } | |
807 | ||
808 | /* even bits */ | |
809 | for (cnt = 0; cnt < len / 4; cnt++) { | |
810 | data = src[cnt]; | |
811 | encode(data, dest + to_cnt++); | |
812 | } | |
813 | } | |
814 | ||
815 | static unsigned long *putsec(int disk, unsigned long *raw, int cnt) | |
816 | { | |
817 | struct header hdr; | |
818 | int i; | |
819 | ||
820 | disk&=3; | |
821 | *raw = (raw[-1]&1) ? 0x2AAAAAAA : 0xAAAAAAAA; | |
822 | raw++; | |
823 | *raw++ = 0x44894489; | |
824 | ||
825 | hdr.magic = 0xFF; | |
826 | hdr.track = unit[disk].track; | |
827 | hdr.sect = cnt; | |
828 | hdr.ord = unit[disk].dtype->sects * unit[disk].type->sect_mult - cnt; | |
829 | for (i = 0; i < 16; i++) | |
830 | hdr.labels[i] = 0; | |
831 | hdr.hdrchk = checksum((ulong *)&hdr, | |
832 | (char *)&hdr.hdrchk-(char *)&hdr); | |
833 | hdr.datachk = checksum((ulong *)(unit[disk].trackbuf+cnt*512), 512); | |
834 | ||
835 | encode_block(raw, (ulong *)&hdr.magic, 4); | |
836 | raw += 2; | |
837 | encode_block(raw, (ulong *)&hdr.labels, 16); | |
838 | raw += 8; | |
839 | encode_block(raw, (ulong *)&hdr.hdrchk, 4); | |
840 | raw += 2; | |
841 | encode_block(raw, (ulong *)&hdr.datachk, 4); | |
842 | raw += 2; | |
843 | encode_block(raw, (ulong *)(unit[disk].trackbuf+cnt*512), 512); | |
844 | raw += 256; | |
845 | ||
846 | return raw; | |
847 | } | |
848 | ||
849 | static void amiga_write(int disk) | |
850 | { | |
851 | unsigned int cnt; | |
852 | unsigned long *ptr = (unsigned long *)raw_buf; | |
853 | ||
854 | disk&=3; | |
855 | /* gap space */ | |
856 | for (cnt = 0; cnt < 415 * unit[disk].type->sect_mult; cnt++) | |
857 | *ptr++ = 0xaaaaaaaa; | |
858 | ||
859 | /* sectors */ | |
860 | for (cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++) | |
861 | ptr = putsec (disk, ptr, cnt); | |
862 | *(ushort *)ptr = (ptr[-1]&1) ? 0x2AA8 : 0xAAA8; | |
863 | } | |
864 | ||
865 | ||
866 | struct dos_header { | |
867 | unsigned char track, /* 0-80 */ | |
868 | side, /* 0-1 */ | |
869 | sec, /* 0-...*/ | |
870 | len_desc;/* 2 */ | |
871 | unsigned short crc; /* on 68000 we got an alignment problem, | |
872 | but this compiler solves it by adding silently | |
873 | adding a pad byte so data won't fit | |
874 | and this took about 3h to discover.... */ | |
875 | unsigned char gap1[22]; /* for longword-alignedness (0x4e) */ | |
876 | }; | |
877 | ||
878 | /* crc routines are borrowed from the messydos-handler */ | |
879 | ||
880 | /* excerpt from the messydos-device | |
881 | ; The CRC is computed not only over the actual data, but including | |
882 | ; the SYNC mark (3 * $a1) and the 'ID/DATA - Address Mark' ($fe/$fb). | |
883 | ; As we don't read or encode these fields into our buffers, we have to | |
884 | ; preload the registers containing the CRC with the values they would have | |
885 | ; after stepping over these fields. | |
886 | ; | |
887 | ; How CRCs "really" work: | |
888 | ; | |
889 | ; First, you should regard a bitstring as a series of coefficients of | |
890 | ; polynomials. We calculate with these polynomials in modulo-2 | |
891 | ; arithmetic, in which both add and subtract are done the same as | |
892 | ; exclusive-or. Now, we modify our data (a very long polynomial) in | |
893 | ; such a way that it becomes divisible by the CCITT-standard 16-bit | |
894 | ; 16 12 5 | |
895 | ; polynomial: x + x + x + 1, represented by $11021. The easiest | |
896 | ; way to do this would be to multiply (using proper arithmetic) our | |
897 | ; datablock with $11021. So we have: | |
898 | ; data * $11021 = | |
899 | ; data * ($10000 + $1021) = | |
900 | ; data * $10000 + data * $1021 | |
901 | ; The left part of this is simple: Just add two 0 bytes. But then | |
902 | ; the right part (data $1021) remains difficult and even could have | |
903 | ; a carry into the left part. The solution is to use a modified | |
904 | ; multiplication, which has a result that is not correct, but with | |
905 | ; a difference of any multiple of $11021. We then only need to keep | |
906 | ; the 16 least significant bits of the result. | |
907 | ; | |
908 | ; The following algorithm does this for us: | |
909 | ; | |
910 | ; unsigned char *data, c, crclo, crchi; | |
911 | ; while (not done) { | |
912 | ; c = *data++ + crchi; | |
913 | ; crchi = (@ c) >> 8 + crclo; | |
914 | ; crclo = @ c; | |
915 | ; } | |
916 | ; | |
917 | ; Remember, + is done with EOR, the @ operator is in two tables (high | |
918 | ; and low byte separately), which is calculated as | |
919 | ; | |
920 | ; $1021 * (c & $F0) | |
921 | ; xor $1021 * (c & $0F) | |
922 | ; xor $1021 * (c >> 4) (* is regular multiplication) | |
923 | ; | |
924 | ; | |
925 | ; Anyway, the end result is the same as the remainder of the division of | |
926 | ; the data by $11021. I am afraid I need to study theory a bit more... | |
927 | ||
928 | ||
929 | my only works was to code this from manx to C.... | |
930 | ||
931 | */ | |
932 | ||
933 | static ushort dos_crc(void * data_a3, int data_d0, int data_d1, int data_d3) | |
934 | { | |
935 | static unsigned char CRCTable1[] = { | |
936 | 0x00,0x10,0x20,0x30,0x40,0x50,0x60,0x70,0x81,0x91,0xa1,0xb1,0xc1,0xd1,0xe1,0xf1, | |
937 | 0x12,0x02,0x32,0x22,0x52,0x42,0x72,0x62,0x93,0x83,0xb3,0xa3,0xd3,0xc3,0xf3,0xe3, | |
938 | 0x24,0x34,0x04,0x14,0x64,0x74,0x44,0x54,0xa5,0xb5,0x85,0x95,0xe5,0xf5,0xc5,0xd5, | |
939 | 0x36,0x26,0x16,0x06,0x76,0x66,0x56,0x46,0xb7,0xa7,0x97,0x87,0xf7,0xe7,0xd7,0xc7, | |
940 | 0x48,0x58,0x68,0x78,0x08,0x18,0x28,0x38,0xc9,0xd9,0xe9,0xf9,0x89,0x99,0xa9,0xb9, | |
941 | 0x5a,0x4a,0x7a,0x6a,0x1a,0x0a,0x3a,0x2a,0xdb,0xcb,0xfb,0xeb,0x9b,0x8b,0xbb,0xab, | |
942 | 0x6c,0x7c,0x4c,0x5c,0x2c,0x3c,0x0c,0x1c,0xed,0xfd,0xcd,0xdd,0xad,0xbd,0x8d,0x9d, | |
943 | 0x7e,0x6e,0x5e,0x4e,0x3e,0x2e,0x1e,0x0e,0xff,0xef,0xdf,0xcf,0xbf,0xaf,0x9f,0x8f, | |
944 | 0x91,0x81,0xb1,0xa1,0xd1,0xc1,0xf1,0xe1,0x10,0x00,0x30,0x20,0x50,0x40,0x70,0x60, | |
945 | 0x83,0x93,0xa3,0xb3,0xc3,0xd3,0xe3,0xf3,0x02,0x12,0x22,0x32,0x42,0x52,0x62,0x72, | |
946 | 0xb5,0xa5,0x95,0x85,0xf5,0xe5,0xd5,0xc5,0x34,0x24,0x14,0x04,0x74,0x64,0x54,0x44, | |
947 | 0xa7,0xb7,0x87,0x97,0xe7,0xf7,0xc7,0xd7,0x26,0x36,0x06,0x16,0x66,0x76,0x46,0x56, | |
948 | 0xd9,0xc9,0xf9,0xe9,0x99,0x89,0xb9,0xa9,0x58,0x48,0x78,0x68,0x18,0x08,0x38,0x28, | |
949 | 0xcb,0xdb,0xeb,0xfb,0x8b,0x9b,0xab,0xbb,0x4a,0x5a,0x6a,0x7a,0x0a,0x1a,0x2a,0x3a, | |
950 | 0xfd,0xed,0xdd,0xcd,0xbd,0xad,0x9d,0x8d,0x7c,0x6c,0x5c,0x4c,0x3c,0x2c,0x1c,0x0c, | |
951 | 0xef,0xff,0xcf,0xdf,0xaf,0xbf,0x8f,0x9f,0x6e,0x7e,0x4e,0x5e,0x2e,0x3e,0x0e,0x1e | |
952 | }; | |
953 | ||
954 | static unsigned char CRCTable2[] = { | |
955 | 0x00,0x21,0x42,0x63,0x84,0xa5,0xc6,0xe7,0x08,0x29,0x4a,0x6b,0x8c,0xad,0xce,0xef, | |
956 | 0x31,0x10,0x73,0x52,0xb5,0x94,0xf7,0xd6,0x39,0x18,0x7b,0x5a,0xbd,0x9c,0xff,0xde, | |
957 | 0x62,0x43,0x20,0x01,0xe6,0xc7,0xa4,0x85,0x6a,0x4b,0x28,0x09,0xee,0xcf,0xac,0x8d, | |
958 | 0x53,0x72,0x11,0x30,0xd7,0xf6,0x95,0xb4,0x5b,0x7a,0x19,0x38,0xdf,0xfe,0x9d,0xbc, | |
959 | 0xc4,0xe5,0x86,0xa7,0x40,0x61,0x02,0x23,0xcc,0xed,0x8e,0xaf,0x48,0x69,0x0a,0x2b, | |
960 | 0xf5,0xd4,0xb7,0x96,0x71,0x50,0x33,0x12,0xfd,0xdc,0xbf,0x9e,0x79,0x58,0x3b,0x1a, | |
961 | 0xa6,0x87,0xe4,0xc5,0x22,0x03,0x60,0x41,0xae,0x8f,0xec,0xcd,0x2a,0x0b,0x68,0x49, | |
962 | 0x97,0xb6,0xd5,0xf4,0x13,0x32,0x51,0x70,0x9f,0xbe,0xdd,0xfc,0x1b,0x3a,0x59,0x78, | |
963 | 0x88,0xa9,0xca,0xeb,0x0c,0x2d,0x4e,0x6f,0x80,0xa1,0xc2,0xe3,0x04,0x25,0x46,0x67, | |
964 | 0xb9,0x98,0xfb,0xda,0x3d,0x1c,0x7f,0x5e,0xb1,0x90,0xf3,0xd2,0x35,0x14,0x77,0x56, | |
965 | 0xea,0xcb,0xa8,0x89,0x6e,0x4f,0x2c,0x0d,0xe2,0xc3,0xa0,0x81,0x66,0x47,0x24,0x05, | |
966 | 0xdb,0xfa,0x99,0xb8,0x5f,0x7e,0x1d,0x3c,0xd3,0xf2,0x91,0xb0,0x57,0x76,0x15,0x34, | |
967 | 0x4c,0x6d,0x0e,0x2f,0xc8,0xe9,0x8a,0xab,0x44,0x65,0x06,0x27,0xc0,0xe1,0x82,0xa3, | |
968 | 0x7d,0x5c,0x3f,0x1e,0xf9,0xd8,0xbb,0x9a,0x75,0x54,0x37,0x16,0xf1,0xd0,0xb3,0x92, | |
969 | 0x2e,0x0f,0x6c,0x4d,0xaa,0x8b,0xe8,0xc9,0x26,0x07,0x64,0x45,0xa2,0x83,0xe0,0xc1, | |
970 | 0x1f,0x3e,0x5d,0x7c,0x9b,0xba,0xd9,0xf8,0x17,0x36,0x55,0x74,0x93,0xb2,0xd1,0xf0 | |
971 | }; | |
972 | ||
973 | /* look at the asm-code - what looks in C a bit strange is almost as good as handmade */ | |
974 | register int i; | |
975 | register unsigned char *CRCT1, *CRCT2, *data, c, crch, crcl; | |
976 | ||
977 | CRCT1=CRCTable1; | |
978 | CRCT2=CRCTable2; | |
979 | data=data_a3; | |
980 | crcl=data_d1; | |
981 | crch=data_d0; | |
982 | for (i=data_d3; i>=0; i--) { | |
983 | c = (*data++) ^ crch; | |
984 | crch = CRCT1[c] ^ crcl; | |
985 | crcl = CRCT2[c]; | |
986 | } | |
987 | return (crch<<8)|crcl; | |
988 | } | |
989 | ||
990 | static inline ushort dos_hdr_crc (struct dos_header *hdr) | |
991 | { | |
992 | return dos_crc(&(hdr->track), 0xb2, 0x30, 3); /* precomputed magic */ | |
993 | } | |
994 | ||
995 | static inline ushort dos_data_crc(unsigned char *data) | |
996 | { | |
997 | return dos_crc(data, 0xe2, 0x95 ,511); /* precomputed magic */ | |
998 | } | |
999 | ||
1000 | static inline unsigned char dos_decode_byte(ushort word) | |
1001 | { | |
1002 | register ushort w2; | |
1003 | register unsigned char byte; | |
1004 | register unsigned char *dec = mfmdecode; | |
1005 | ||
1006 | w2=word; | |
1007 | w2>>=8; | |
1008 | w2&=127; | |
1009 | byte = dec[w2]; | |
1010 | byte <<= 4; | |
1011 | w2 = word & 127; | |
1012 | byte |= dec[w2]; | |
1013 | return byte; | |
1014 | } | |
1015 | ||
1016 | static unsigned long dos_decode(unsigned char *data, unsigned short *raw, int len) | |
1017 | { | |
1018 | int i; | |
1019 | ||
1020 | for (i = 0; i < len; i++) | |
1021 | *data++=dos_decode_byte(*raw++); | |
1022 | return ((ulong)raw); | |
1023 | } | |
1024 | ||
1025 | #ifdef DEBUG | |
1026 | static void dbg(unsigned long ptr) | |
1027 | { | |
1028 | printk("raw data @%08lx: %08lx, %08lx ,%08lx, %08lx\n", ptr, | |
1029 | ((ulong *)ptr)[0], ((ulong *)ptr)[1], | |
1030 | ((ulong *)ptr)[2], ((ulong *)ptr)[3]); | |
1031 | } | |
1032 | #endif | |
1033 | ||
1034 | static int dos_read(int drive) | |
1035 | { | |
1036 | unsigned long end; | |
1037 | unsigned long raw; | |
1038 | int scnt; | |
1039 | unsigned short crc,data_crc[2]; | |
1040 | struct dos_header hdr; | |
1041 | ||
1042 | drive&=3; | |
1043 | raw = (long) raw_buf; | |
1044 | end = raw + unit[drive].type->read_size; | |
1045 | ||
1046 | for (scnt=0; scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) { | |
1047 | do { /* search for the right sync of each sec-hdr */ | |
1048 | if (!(raw = scan_sync (raw, end))) { | |
1049 | printk(KERN_INFO "dos_read: no hdr sync on " | |
1050 | "track %d, unit %d for sector %d\n", | |
1051 | unit[drive].track,drive,scnt); | |
1052 | return MFM_NOSYNC; | |
1053 | } | |
1054 | #ifdef DEBUG | |
1055 | dbg(raw); | |
1056 | #endif | |
1057 | } while (*((ushort *)raw)!=0x5554); /* loop usually only once done */ | |
1058 | raw+=2; /* skip over headermark */ | |
1059 | raw = dos_decode((unsigned char *)&hdr,(ushort *) raw,8); | |
1060 | crc = dos_hdr_crc(&hdr); | |
1061 | ||
1062 | #ifdef DEBUG | |
1063 | printk("(%3d,%d,%2d,%d) %x\n", hdr.track, hdr.side, | |
1064 | hdr.sec, hdr.len_desc, hdr.crc); | |
1065 | #endif | |
1066 | ||
1067 | if (crc != hdr.crc) { | |
1068 | printk(KERN_INFO "dos_read: MFM_HEADER %04x,%04x\n", | |
1069 | hdr.crc, crc); | |
1070 | return MFM_HEADER; | |
1071 | } | |
1072 | if (hdr.track != unit[drive].track/unit[drive].type->heads) { | |
1073 | printk(KERN_INFO "dos_read: MFM_TRACK %d, %d\n", | |
1074 | hdr.track, | |
1075 | unit[drive].track/unit[drive].type->heads); | |
1076 | return MFM_TRACK; | |
1077 | } | |
1078 | ||
1079 | if (hdr.side != unit[drive].track%unit[drive].type->heads) { | |
1080 | printk(KERN_INFO "dos_read: MFM_SIDE %d, %d\n", | |
1081 | hdr.side, | |
1082 | unit[drive].track%unit[drive].type->heads); | |
1083 | return MFM_TRACK; | |
1084 | } | |
1085 | ||
1086 | if (hdr.len_desc != 2) { | |
1087 | printk(KERN_INFO "dos_read: unknown sector len " | |
1088 | "descriptor %d\n", hdr.len_desc); | |
1089 | return MFM_DATA; | |
1090 | } | |
1091 | #ifdef DEBUG | |
1092 | printk("hdr accepted\n"); | |
1093 | #endif | |
1094 | if (!(raw = scan_sync (raw, end))) { | |
1095 | printk(KERN_INFO "dos_read: no data sync on track " | |
1096 | "%d, unit %d for sector%d, disk sector %d\n", | |
1097 | unit[drive].track, drive, scnt, hdr.sec); | |
1098 | return MFM_NOSYNC; | |
1099 | } | |
1100 | #ifdef DEBUG | |
1101 | dbg(raw); | |
1102 | #endif | |
1103 | ||
1104 | if (*((ushort *)raw)!=0x5545) { | |
1105 | printk(KERN_INFO "dos_read: no data mark after " | |
1106 | "sync (%d,%d,%d,%d) sc=%d\n", | |
1107 | hdr.track,hdr.side,hdr.sec,hdr.len_desc,scnt); | |
1108 | return MFM_NOSYNC; | |
1109 | } | |
1110 | ||
1111 | raw+=2; /* skip data mark (included in checksum) */ | |
1112 | raw = dos_decode((unsigned char *)(unit[drive].trackbuf + (hdr.sec - 1) * 512), (ushort *) raw, 512); | |
1113 | raw = dos_decode((unsigned char *)data_crc,(ushort *) raw,4); | |
1114 | crc = dos_data_crc(unit[drive].trackbuf + (hdr.sec - 1) * 512); | |
1115 | ||
1116 | if (crc != data_crc[0]) { | |
1117 | printk(KERN_INFO "dos_read: MFM_DATA (%d,%d,%d,%d) " | |
1118 | "sc=%d, %x %x\n", hdr.track, hdr.side, | |
1119 | hdr.sec, hdr.len_desc, scnt,data_crc[0], crc); | |
1120 | printk(KERN_INFO "data=(%lx,%lx,%lx,%lx,...)\n", | |
1121 | ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[0], | |
1122 | ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[1], | |
1123 | ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[2], | |
1124 | ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[3]); | |
1125 | return MFM_DATA; | |
1126 | } | |
1127 | } | |
1128 | return 0; | |
1129 | } | |
1130 | ||
1131 | static inline ushort dos_encode_byte(unsigned char byte) | |
1132 | { | |
1133 | register unsigned char *enc, b2, b1; | |
1134 | register ushort word; | |
1135 | ||
1136 | enc=mfmencode; | |
1137 | b1=byte; | |
1138 | b2=b1>>4; | |
1139 | b1&=15; | |
1140 | word=enc[b2] <<8 | enc [b1]; | |
1141 | return (word|((word&(256|64)) ? 0: 128)); | |
1142 | } | |
1143 | ||
1144 | static void dos_encode_block(ushort *dest, unsigned char *src, int len) | |
1145 | { | |
1146 | int i; | |
1147 | ||
1148 | for (i = 0; i < len; i++) { | |
1149 | *dest=dos_encode_byte(*src++); | |
1150 | *dest|=((dest[-1]&1)||(*dest&0x4000))? 0: 0x8000; | |
1151 | dest++; | |
1152 | } | |
1153 | } | |
1154 | ||
1155 | static unsigned long *ms_putsec(int drive, unsigned long *raw, int cnt) | |
1156 | { | |
1157 | static struct dos_header hdr={0,0,0,2,0, | |
1158 | {78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78}}; | |
1159 | int i; | |
1160 | static ushort crc[2]={0,0x4e4e}; | |
1161 | ||
1162 | drive&=3; | |
1163 | /* id gap 1 */ | |
1164 | /* the MFM word before is always 9254 */ | |
1165 | for(i=0;i<6;i++) | |
1166 | *raw++=0xaaaaaaaa; | |
1167 | /* 3 sync + 1 headermark */ | |
1168 | *raw++=0x44894489; | |
1169 | *raw++=0x44895554; | |
1170 | ||
1171 | /* fill in the variable parts of the header */ | |
1172 | hdr.track=unit[drive].track/unit[drive].type->heads; | |
1173 | hdr.side=unit[drive].track%unit[drive].type->heads; | |
1174 | hdr.sec=cnt+1; | |
1175 | hdr.crc=dos_hdr_crc(&hdr); | |
1176 | ||
1177 | /* header (without "magic") and id gap 2*/ | |
1178 | dos_encode_block((ushort *)raw,(unsigned char *) &hdr.track,28); | |
1179 | raw+=14; | |
1180 | ||
1181 | /*id gap 3 */ | |
1182 | for(i=0;i<6;i++) | |
1183 | *raw++=0xaaaaaaaa; | |
1184 | ||
1185 | /* 3 syncs and 1 datamark */ | |
1186 | *raw++=0x44894489; | |
1187 | *raw++=0x44895545; | |
1188 | ||
1189 | /* data */ | |
1190 | dos_encode_block((ushort *)raw, | |
1191 | (unsigned char *)unit[drive].trackbuf+cnt*512,512); | |
1192 | raw+=256; | |
1193 | ||
1194 | /*data crc + jd's special gap (long words :-/) */ | |
1195 | crc[0]=dos_data_crc(unit[drive].trackbuf+cnt*512); | |
1196 | dos_encode_block((ushort *) raw,(unsigned char *)crc,4); | |
1197 | raw+=2; | |
1198 | ||
1199 | /* data gap */ | |
1200 | for(i=0;i<38;i++) | |
1201 | *raw++=0x92549254; | |
1202 | ||
1203 | return raw; /* wrote 652 MFM words */ | |
1204 | } | |
1205 | ||
1206 | static void dos_write(int disk) | |
1207 | { | |
1208 | int cnt; | |
1209 | unsigned long raw = (unsigned long) raw_buf; | |
1210 | unsigned long *ptr=(unsigned long *)raw; | |
1211 | ||
1212 | disk&=3; | |
1213 | /* really gap4 + indexgap , but we write it first and round it up */ | |
1214 | for (cnt=0;cnt<425;cnt++) | |
1215 | *ptr++=0x92549254; | |
1216 | ||
1217 | /* the following is just guessed */ | |
1218 | if (unit[disk].type->sect_mult==2) /* check for HD-Disks */ | |
1219 | for(cnt=0;cnt<473;cnt++) | |
1220 | *ptr++=0x92549254; | |
1221 | ||
1222 | /* now the index marks...*/ | |
1223 | for (cnt=0;cnt<20;cnt++) | |
1224 | *ptr++=0x92549254; | |
1225 | for (cnt=0;cnt<6;cnt++) | |
1226 | *ptr++=0xaaaaaaaa; | |
1227 | *ptr++=0x52245224; | |
1228 | *ptr++=0x52245552; | |
1229 | for (cnt=0;cnt<20;cnt++) | |
1230 | *ptr++=0x92549254; | |
1231 | ||
1232 | /* sectors */ | |
1233 | for(cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++) | |
1234 | ptr=ms_putsec(disk,ptr,cnt); | |
1235 | ||
1236 | *(ushort *)ptr = 0xaaa8; /* MFM word before is always 0x9254 */ | |
1237 | } | |
1238 | ||
1239 | /* | |
1240 | * Here comes the high level stuff (i.e. the filesystem interface) | |
1241 | * and helper functions. | |
1242 | * Normally this should be the only part that has to be adapted to | |
1243 | * different kernel versions. | |
1244 | */ | |
1245 | ||
1246 | /* FIXME: this assumes the drive is still spinning - | |
1247 | * which is only true if we complete writing a track within three seconds | |
1248 | */ | |
1249 | static void flush_track_callback(unsigned long nr) | |
1250 | { | |
1251 | nr&=3; | |
1252 | writefromint = 1; | |
1253 | if (!try_fdc(nr)) { | |
1254 | /* we might block in an interrupt, so try again later */ | |
1255 | flush_track_timer[nr].expires = jiffies + 1; | |
1256 | add_timer(flush_track_timer + nr); | |
1257 | return; | |
1258 | } | |
1259 | get_fdc(nr); | |
1260 | (*unit[nr].dtype->write_fkt)(nr); | |
1261 | if (!raw_write(nr)) { | |
1262 | printk (KERN_NOTICE "floppy disk write protected\n"); | |
1263 | writefromint = 0; | |
1264 | writepending = 0; | |
1265 | } | |
1266 | rel_fdc(); | |
1267 | } | |
1268 | ||
1269 | static int non_int_flush_track (unsigned long nr) | |
1270 | { | |
1271 | unsigned long flags; | |
1272 | ||
1273 | nr&=3; | |
1274 | writefromint = 0; | |
1275 | del_timer(&post_write_timer); | |
1276 | get_fdc(nr); | |
1277 | if (!fd_motor_on(nr)) { | |
1278 | writepending = 0; | |
1279 | rel_fdc(); | |
1280 | return 0; | |
1281 | } | |
1282 | local_irq_save(flags); | |
1283 | if (writepending != 2) { | |
1284 | local_irq_restore(flags); | |
1285 | (*unit[nr].dtype->write_fkt)(nr); | |
1286 | if (!raw_write(nr)) { | |
1287 | printk (KERN_NOTICE "floppy disk write protected " | |
1288 | "in write!\n"); | |
1289 | writepending = 0; | |
1290 | return 0; | |
1291 | } | |
6d0be946 | 1292 | wait_event(wait_fd_block, block_flag != 2); |
1da177e4 LT |
1293 | } |
1294 | else { | |
1295 | local_irq_restore(flags); | |
1296 | ms_delay(2); /* 2 ms post_write delay */ | |
1297 | post_write(nr); | |
1298 | } | |
1299 | rel_fdc(); | |
1300 | return 1; | |
1301 | } | |
1302 | ||
1303 | static int get_track(int drive, int track) | |
1304 | { | |
1305 | int error, errcnt; | |
1306 | ||
1307 | drive&=3; | |
1308 | if (unit[drive].track == track) | |
1309 | return 0; | |
1310 | get_fdc(drive); | |
1311 | if (!fd_motor_on(drive)) { | |
1312 | rel_fdc(); | |
1313 | return -1; | |
1314 | } | |
1315 | ||
1316 | if (unit[drive].dirty == 1) { | |
1317 | del_timer (flush_track_timer + drive); | |
1318 | non_int_flush_track (drive); | |
1319 | } | |
1320 | errcnt = 0; | |
1321 | while (errcnt < MAX_ERRORS) { | |
1322 | if (!fd_seek(drive, track)) | |
1323 | return -1; | |
1324 | raw_read(drive); | |
1325 | error = (*unit[drive].dtype->read_fkt)(drive); | |
1326 | if (error == 0) { | |
1327 | rel_fdc(); | |
1328 | return 0; | |
1329 | } | |
1330 | /* Read Error Handling: recalibrate and try again */ | |
1331 | unit[drive].track = -1; | |
1332 | errcnt++; | |
1333 | } | |
1334 | rel_fdc(); | |
1335 | return -1; | |
1336 | } | |
1337 | ||
1338 | static void redo_fd_request(void) | |
1339 | { | |
9e31bebe | 1340 | struct request *rq; |
1da177e4 LT |
1341 | unsigned int cnt, block, track, sector; |
1342 | int drive; | |
1343 | struct amiga_floppy_struct *floppy; | |
1344 | char *data; | |
1345 | unsigned long flags; | |
9e31bebe | 1346 | int err; |
1da177e4 | 1347 | |
9e31bebe | 1348 | next_req: |
9934c8c0 | 1349 | rq = blk_fetch_request(floppy_queue); |
9e31bebe | 1350 | if (!rq) { |
1da177e4 LT |
1351 | /* Nothing left to do */ |
1352 | return; | |
1353 | } | |
1354 | ||
9e31bebe | 1355 | floppy = rq->rq_disk->private_data; |
1da177e4 LT |
1356 | drive = floppy - unit; |
1357 | ||
9e31bebe | 1358 | next_segment: |
1da177e4 | 1359 | /* Here someone could investigate to be more efficient */ |
9e31bebe | 1360 | for (cnt = 0, err = 0; cnt < blk_rq_cur_sectors(rq); cnt++) { |
1da177e4 LT |
1361 | #ifdef DEBUG |
1362 | printk("fd: sector %ld + %d requested for %s\n", | |
9e31bebe TH |
1363 | blk_rq_pos(rq), cnt, |
1364 | (rq_data_dir(rq) == READ) ? "read" : "write"); | |
1da177e4 | 1365 | #endif |
9e31bebe | 1366 | block = blk_rq_pos(rq) + cnt; |
1da177e4 | 1367 | if ((int)block > floppy->blocks) { |
9e31bebe TH |
1368 | err = -EIO; |
1369 | break; | |
1da177e4 LT |
1370 | } |
1371 | ||
1372 | track = block / (floppy->dtype->sects * floppy->type->sect_mult); | |
1373 | sector = block % (floppy->dtype->sects * floppy->type->sect_mult); | |
9e31bebe | 1374 | data = rq->buffer + 512 * cnt; |
1da177e4 LT |
1375 | #ifdef DEBUG |
1376 | printk("access to track %d, sector %d, with buffer at " | |
1377 | "0x%08lx\n", track, sector, data); | |
1378 | #endif | |
1379 | ||
1da177e4 | 1380 | if (get_track(drive, track) == -1) { |
9e31bebe TH |
1381 | err = -EIO; |
1382 | break; | |
1da177e4 LT |
1383 | } |
1384 | ||
9e31bebe | 1385 | if (rq_data_dir(rq) == READ) { |
1da177e4 | 1386 | memcpy(data, floppy->trackbuf + sector * 512, 512); |
9e31bebe | 1387 | } else { |
1da177e4 LT |
1388 | memcpy(floppy->trackbuf + sector * 512, data, 512); |
1389 | ||
1390 | /* keep the drive spinning while writes are scheduled */ | |
1391 | if (!fd_motor_on(drive)) { | |
9e31bebe TH |
1392 | err = -EIO; |
1393 | break; | |
1da177e4 LT |
1394 | } |
1395 | /* | |
1396 | * setup a callback to write the track buffer | |
1397 | * after a short (1 tick) delay. | |
1398 | */ | |
1399 | local_irq_save(flags); | |
1400 | ||
1401 | floppy->dirty = 1; | |
1402 | /* reset the timer */ | |
1403 | mod_timer (flush_track_timer + drive, jiffies + 1); | |
1404 | local_irq_restore(flags); | |
1da177e4 LT |
1405 | } |
1406 | } | |
1da177e4 | 1407 | |
9e31bebe TH |
1408 | if (__blk_end_request_cur(rq, err)) |
1409 | goto next_segment; | |
1410 | goto next_req; | |
1da177e4 LT |
1411 | } |
1412 | ||
165125e1 | 1413 | static void do_fd_request(struct request_queue * q) |
1da177e4 LT |
1414 | { |
1415 | redo_fd_request(); | |
1416 | } | |
1417 | ||
a885c8c4 CH |
1418 | static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1419 | { | |
1420 | int drive = MINOR(bdev->bd_dev) & 3; | |
1421 | ||
1422 | geo->heads = unit[drive].type->heads; | |
1423 | geo->sectors = unit[drive].dtype->sects * unit[drive].type->sect_mult; | |
1424 | geo->cylinders = unit[drive].type->tracks; | |
1425 | return 0; | |
1426 | } | |
1427 | ||
8a6cfeb6 | 1428 | static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
1429 | unsigned int cmd, unsigned long param) |
1430 | { | |
47225db5 AV |
1431 | struct amiga_floppy_struct *p = bdev->bd_disk->private_data; |
1432 | int drive = p - unit; | |
1da177e4 | 1433 | static struct floppy_struct getprm; |
8a423e54 | 1434 | void __user *argp = (void __user *)param; |
1da177e4 LT |
1435 | |
1436 | switch(cmd){ | |
1da177e4 LT |
1437 | case FDFMTBEG: |
1438 | get_fdc(drive); | |
1439 | if (fd_ref[drive] > 1) { | |
1440 | rel_fdc(); | |
1441 | return -EBUSY; | |
1442 | } | |
47225db5 | 1443 | fsync_bdev(bdev); |
1da177e4 LT |
1444 | if (fd_motor_on(drive) == 0) { |
1445 | rel_fdc(); | |
1446 | return -ENODEV; | |
1447 | } | |
1448 | if (fd_calibrate(drive) == 0) { | |
1449 | rel_fdc(); | |
1450 | return -ENXIO; | |
1451 | } | |
1452 | floppy_off(drive); | |
1453 | rel_fdc(); | |
1454 | break; | |
1455 | case FDFMTTRK: | |
47225db5 | 1456 | if (param < p->type->tracks * p->type->heads) |
1da177e4 LT |
1457 | { |
1458 | get_fdc(drive); | |
1459 | if (fd_seek(drive,param) != 0){ | |
47225db5 AV |
1460 | memset(p->trackbuf, FD_FILL_BYTE, |
1461 | p->dtype->sects * p->type->sect_mult * 512); | |
1da177e4 LT |
1462 | non_int_flush_track(drive); |
1463 | } | |
1464 | floppy_off(drive); | |
1465 | rel_fdc(); | |
1466 | } | |
1467 | else | |
1468 | return -EINVAL; | |
1469 | break; | |
1470 | case FDFMTEND: | |
1471 | floppy_off(drive); | |
47225db5 | 1472 | invalidate_bdev(bdev); |
1da177e4 LT |
1473 | break; |
1474 | case FDGETPRM: | |
1475 | memset((void *)&getprm, 0, sizeof (getprm)); | |
47225db5 AV |
1476 | getprm.track=p->type->tracks; |
1477 | getprm.head=p->type->heads; | |
1478 | getprm.sect=p->dtype->sects * p->type->sect_mult; | |
1479 | getprm.size=p->blocks; | |
8a423e54 | 1480 | if (copy_to_user(argp, &getprm, sizeof(struct floppy_struct))) |
1da177e4 LT |
1481 | return -EFAULT; |
1482 | break; | |
1483 | case FDSETPRM: | |
1484 | case FDDEFPRM: | |
1485 | return -EINVAL; | |
1486 | case FDFLUSH: /* unconditionally, even if not needed */ | |
1487 | del_timer (flush_track_timer + drive); | |
1488 | non_int_flush_track(drive); | |
1489 | break; | |
1490 | #ifdef RAW_IOCTL | |
1491 | case IOCTL_RAW_TRACK: | |
47225db5 | 1492 | if (copy_to_user(argp, raw_buf, p->type->read_size)) |
1da177e4 LT |
1493 | return -EFAULT; |
1494 | else | |
47225db5 | 1495 | return p->type->read_size; |
1da177e4 LT |
1496 | #endif |
1497 | default: | |
1498 | printk(KERN_DEBUG "fd_ioctl: unknown cmd %d for drive %d.", | |
1499 | cmd, drive); | |
1500 | return -ENOSYS; | |
1501 | } | |
1502 | return 0; | |
1503 | } | |
1504 | ||
8a6cfeb6 AB |
1505 | static int fd_ioctl(struct block_device *bdev, fmode_t mode, |
1506 | unsigned int cmd, unsigned long param) | |
1507 | { | |
1508 | int ret; | |
1509 | ||
2a48fc0a | 1510 | mutex_lock(&amiflop_mutex); |
8a6cfeb6 | 1511 | ret = fd_locked_ioctl(bdev, mode, cmd, param); |
2a48fc0a | 1512 | mutex_unlock(&amiflop_mutex); |
8a6cfeb6 AB |
1513 | |
1514 | return ret; | |
1515 | } | |
1516 | ||
1da177e4 LT |
1517 | static void fd_probe(int dev) |
1518 | { | |
1519 | unsigned long code; | |
1520 | int type; | |
1521 | int drive; | |
1522 | ||
1523 | drive = dev & 3; | |
1524 | code = fd_get_drive_id(drive); | |
1525 | ||
1526 | /* get drive type */ | |
1527 | for (type = 0; type < num_dr_types; type++) | |
1528 | if (drive_types[type].code == code) | |
1529 | break; | |
1530 | ||
1531 | if (type >= num_dr_types) { | |
1532 | printk(KERN_WARNING "fd_probe: unsupported drive type " | |
1533 | "%08lx found\n", code); | |
1534 | unit[drive].type = &drive_types[num_dr_types-1]; /* FD_NODRIVE */ | |
1535 | return; | |
1536 | } | |
1537 | ||
1538 | unit[drive].type = drive_types + type; | |
1539 | unit[drive].track = -1; | |
1540 | ||
1541 | unit[drive].disk = -1; | |
1542 | unit[drive].motor = 0; | |
1543 | unit[drive].busy = 0; | |
1544 | unit[drive].status = -1; | |
1545 | } | |
1546 | ||
1547 | /* | |
1548 | * floppy_open check for aliasing (/dev/fd0 can be the same as | |
1549 | * /dev/PS0 etc), and disallows simultaneous access to the same | |
1550 | * drive with different device numbers. | |
1551 | */ | |
47225db5 | 1552 | static int floppy_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 1553 | { |
47225db5 AV |
1554 | int drive = MINOR(bdev->bd_dev) & 3; |
1555 | int system = (MINOR(bdev->bd_dev) & 4) >> 2; | |
1da177e4 LT |
1556 | int old_dev; |
1557 | unsigned long flags; | |
1558 | ||
2a48fc0a | 1559 | mutex_lock(&amiflop_mutex); |
1da177e4 LT |
1560 | old_dev = fd_device[drive]; |
1561 | ||
6e9624b8 | 1562 | if (fd_ref[drive] && old_dev != system) { |
2a48fc0a | 1563 | mutex_unlock(&amiflop_mutex); |
1da177e4 | 1564 | return -EBUSY; |
6e9624b8 | 1565 | } |
1da177e4 | 1566 | |
47225db5 AV |
1567 | if (mode & (FMODE_READ|FMODE_WRITE)) { |
1568 | check_disk_change(bdev); | |
1569 | if (mode & FMODE_WRITE) { | |
1da177e4 LT |
1570 | int wrprot; |
1571 | ||
1572 | get_fdc(drive); | |
1573 | fd_select (drive); | |
1574 | wrprot = !(ciaa.pra & DSKPROT); | |
1575 | fd_deselect (drive); | |
1576 | rel_fdc(); | |
1577 | ||
6e9624b8 | 1578 | if (wrprot) { |
2a48fc0a | 1579 | mutex_unlock(&amiflop_mutex); |
1da177e4 | 1580 | return -EROFS; |
6e9624b8 | 1581 | } |
1da177e4 LT |
1582 | } |
1583 | } | |
1584 | ||
1585 | local_irq_save(flags); | |
1586 | fd_ref[drive]++; | |
1587 | fd_device[drive] = system; | |
1588 | local_irq_restore(flags); | |
1589 | ||
1590 | unit[drive].dtype=&data_types[system]; | |
1591 | unit[drive].blocks=unit[drive].type->heads*unit[drive].type->tracks* | |
1592 | data_types[system].sects*unit[drive].type->sect_mult; | |
1593 | set_capacity(unit[drive].gendisk, unit[drive].blocks); | |
1594 | ||
1595 | printk(KERN_INFO "fd%d: accessing %s-disk with %s-layout\n",drive, | |
1596 | unit[drive].type->name, data_types[system].name); | |
1597 | ||
2a48fc0a | 1598 | mutex_unlock(&amiflop_mutex); |
1da177e4 LT |
1599 | return 0; |
1600 | } | |
1601 | ||
47225db5 | 1602 | static int floppy_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 1603 | { |
47225db5 AV |
1604 | struct amiga_floppy_struct *p = disk->private_data; |
1605 | int drive = p - unit; | |
1da177e4 | 1606 | |
2a48fc0a | 1607 | mutex_lock(&amiflop_mutex); |
1da177e4 LT |
1608 | if (unit[drive].dirty == 1) { |
1609 | del_timer (flush_track_timer + drive); | |
1610 | non_int_flush_track (drive); | |
1611 | } | |
1612 | ||
1613 | if (!fd_ref[drive]--) { | |
1614 | printk(KERN_CRIT "floppy_release with fd_ref == 0"); | |
1615 | fd_ref[drive] = 0; | |
1616 | } | |
1617 | #ifdef MODULE | |
1618 | /* the mod_use counter is handled this way */ | |
1619 | floppy_off (drive | 0x40000000); | |
1620 | #endif | |
2a48fc0a | 1621 | mutex_unlock(&amiflop_mutex); |
1da177e4 LT |
1622 | return 0; |
1623 | } | |
1624 | ||
1625 | /* | |
1626 | * floppy-change is never called from an interrupt, so we can relax a bit | |
1627 | * here, sleep etc. Note that floppy-on tries to set current_DOR to point | |
1628 | * to the desired drive, but it will probably not survive the sleep if | |
1629 | * several floppies are used at the same time: thus the loop. | |
1630 | */ | |
1631 | static int amiga_floppy_change(struct gendisk *disk) | |
1632 | { | |
1633 | struct amiga_floppy_struct *p = disk->private_data; | |
1634 | int drive = p - unit; | |
1635 | int changed; | |
1636 | static int first_time = 1; | |
1637 | ||
1638 | if (first_time) | |
1639 | changed = first_time--; | |
1640 | else { | |
1641 | get_fdc(drive); | |
1642 | fd_select (drive); | |
1643 | changed = !(ciaa.pra & DSKCHANGE); | |
1644 | fd_deselect (drive); | |
1645 | rel_fdc(); | |
1646 | } | |
1647 | ||
1648 | if (changed) { | |
1649 | fd_probe(drive); | |
1650 | p->track = -1; | |
1651 | p->dirty = 0; | |
1652 | writepending = 0; /* if this was true before, too bad! */ | |
1653 | writefromint = 0; | |
1654 | return 1; | |
1655 | } | |
1656 | return 0; | |
1657 | } | |
1658 | ||
83d5cde4 | 1659 | static const struct block_device_operations floppy_fops = { |
1da177e4 | 1660 | .owner = THIS_MODULE, |
47225db5 AV |
1661 | .open = floppy_open, |
1662 | .release = floppy_release, | |
8a6cfeb6 | 1663 | .ioctl = fd_ioctl, |
a885c8c4 | 1664 | .getgeo = fd_getgeo, |
1da177e4 LT |
1665 | .media_changed = amiga_floppy_change, |
1666 | }; | |
1667 | ||
1da177e4 LT |
1668 | static int __init fd_probe_drives(void) |
1669 | { | |
1670 | int drive,drives,nomem; | |
1671 | ||
ad361c98 | 1672 | printk(KERN_INFO "FD: probing units\nfound "); |
1da177e4 LT |
1673 | drives=0; |
1674 | nomem=0; | |
1675 | for(drive=0;drive<FD_MAX_UNITS;drive++) { | |
1676 | struct gendisk *disk; | |
1677 | fd_probe(drive); | |
1678 | if (unit[drive].type->code == FD_NODRIVE) | |
1679 | continue; | |
1680 | disk = alloc_disk(1); | |
1681 | if (!disk) { | |
1682 | unit[drive].type->code = FD_NODRIVE; | |
1683 | continue; | |
1684 | } | |
1685 | unit[drive].gendisk = disk; | |
1686 | drives++; | |
1687 | if ((unit[drive].trackbuf = kmalloc(FLOPPY_MAX_SECTORS * 512, GFP_KERNEL)) == NULL) { | |
1688 | printk("no mem for "); | |
1689 | unit[drive].type = &drive_types[num_dr_types - 1]; /* FD_NODRIVE */ | |
1690 | drives--; | |
1691 | nomem = 1; | |
1692 | } | |
1693 | printk("fd%d ",drive); | |
1694 | disk->major = FLOPPY_MAJOR; | |
1695 | disk->first_minor = drive; | |
1696 | disk->fops = &floppy_fops; | |
1697 | sprintf(disk->disk_name, "fd%d", drive); | |
1698 | disk->private_data = &unit[drive]; | |
1699 | disk->queue = floppy_queue; | |
1700 | set_capacity(disk, 880*2); | |
1701 | add_disk(disk); | |
1702 | } | |
1703 | if ((drives > 0) || (nomem == 0)) { | |
1704 | if (drives == 0) | |
1705 | printk("no drives"); | |
1706 | printk("\n"); | |
1707 | return drives; | |
1708 | } | |
1709 | printk("\n"); | |
1710 | return -ENOMEM; | |
1711 | } | |
1712 | ||
1713 | static struct kobject *floppy_find(dev_t dev, int *part, void *data) | |
1714 | { | |
1715 | int drive = *part & 3; | |
1716 | if (unit[drive].type->code == FD_NODRIVE) | |
1717 | return NULL; | |
1718 | *part = 0; | |
1719 | return get_disk(unit[drive].gendisk); | |
1720 | } | |
1721 | ||
92183b34 | 1722 | static int __init amiga_floppy_probe(struct platform_device *pdev) |
1da177e4 LT |
1723 | { |
1724 | int i, ret; | |
1725 | ||
1da177e4 LT |
1726 | if (register_blkdev(FLOPPY_MAJOR,"fd")) |
1727 | return -EBUSY; | |
1728 | ||
1da177e4 LT |
1729 | ret = -ENOMEM; |
1730 | if ((raw_buf = (char *)amiga_chip_alloc (RAW_BUF_SIZE, "Floppy")) == | |
1731 | NULL) { | |
1732 | printk("fd: cannot get chip mem buffer\n"); | |
92183b34 | 1733 | goto out_blkdev; |
1da177e4 LT |
1734 | } |
1735 | ||
1736 | ret = -EBUSY; | |
1737 | if (request_irq(IRQ_AMIGA_DSKBLK, fd_block_done, 0, "floppy_dma", NULL)) { | |
1738 | printk("fd: cannot get irq for dma\n"); | |
1739 | goto out_irq; | |
1740 | } | |
1741 | ||
1742 | if (request_irq(IRQ_AMIGA_CIAA_TB, ms_isr, 0, "floppy_timer", NULL)) { | |
1743 | printk("fd: cannot get irq for timer\n"); | |
1744 | goto out_irq2; | |
1745 | } | |
1746 | ||
1747 | ret = -ENOMEM; | |
1748 | floppy_queue = blk_init_queue(do_fd_request, &amiflop_lock); | |
1749 | if (!floppy_queue) | |
1750 | goto out_queue; | |
1751 | ||
fd5b462f | 1752 | ret = -ENODEV; |
1da177e4 LT |
1753 | if (fd_probe_drives() < 1) /* No usable drives */ |
1754 | goto out_probe; | |
1755 | ||
1756 | blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE, | |
1757 | floppy_find, NULL, NULL); | |
1758 | ||
1759 | /* initialize variables */ | |
1760 | init_timer(&motor_on_timer); | |
1761 | motor_on_timer.expires = 0; | |
1762 | motor_on_timer.data = 0; | |
1763 | motor_on_timer.function = motor_on_callback; | |
1764 | for (i = 0; i < FD_MAX_UNITS; i++) { | |
1765 | init_timer(&motor_off_timer[i]); | |
1766 | motor_off_timer[i].expires = 0; | |
1767 | motor_off_timer[i].data = i|0x80000000; | |
1768 | motor_off_timer[i].function = fd_motor_off; | |
1769 | init_timer(&flush_track_timer[i]); | |
1770 | flush_track_timer[i].expires = 0; | |
1771 | flush_track_timer[i].data = i; | |
1772 | flush_track_timer[i].function = flush_track_callback; | |
1773 | ||
1774 | unit[i].track = -1; | |
1775 | } | |
1776 | ||
1777 | init_timer(&post_write_timer); | |
1778 | post_write_timer.expires = 0; | |
1779 | post_write_timer.data = 0; | |
1780 | post_write_timer.function = post_write; | |
1781 | ||
1782 | for (i = 0; i < 128; i++) | |
1783 | mfmdecode[i]=255; | |
1784 | for (i = 0; i < 16; i++) | |
1785 | mfmdecode[mfmencode[i]]=i; | |
1786 | ||
1787 | /* make sure that disk DMA is enabled */ | |
1788 | custom.dmacon = DMAF_SETCLR | DMAF_DISK; | |
1789 | ||
1790 | /* init ms timer */ | |
1791 | ciaa.crb = 8; /* one-shot, stop */ | |
1792 | return 0; | |
1793 | ||
1794 | out_probe: | |
1795 | blk_cleanup_queue(floppy_queue); | |
1796 | out_queue: | |
1797 | free_irq(IRQ_AMIGA_CIAA_TB, NULL); | |
1798 | out_irq2: | |
1799 | free_irq(IRQ_AMIGA_DSKBLK, NULL); | |
1800 | out_irq: | |
1801 | amiga_chip_free(raw_buf); | |
1da177e4 LT |
1802 | out_blkdev: |
1803 | unregister_blkdev(FLOPPY_MAJOR,"fd"); | |
1804 | return ret; | |
1805 | } | |
1806 | ||
1da177e4 | 1807 | #if 0 /* not safe to unload */ |
92183b34 | 1808 | static int __exit amiga_floppy_remove(struct platform_device *pdev) |
1da177e4 LT |
1809 | { |
1810 | int i; | |
1811 | ||
1812 | for( i = 0; i < FD_MAX_UNITS; i++) { | |
1813 | if (unit[i].type->code != FD_NODRIVE) { | |
1814 | del_gendisk(unit[i].gendisk); | |
1815 | put_disk(unit[i].gendisk); | |
1816 | kfree(unit[i].trackbuf); | |
1817 | } | |
1818 | } | |
1819 | blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256); | |
1820 | free_irq(IRQ_AMIGA_CIAA_TB, NULL); | |
1821 | free_irq(IRQ_AMIGA_DSKBLK, NULL); | |
1822 | custom.dmacon = DMAF_DISK; /* disable DMA */ | |
1823 | amiga_chip_free(raw_buf); | |
1824 | blk_cleanup_queue(floppy_queue); | |
1da177e4 LT |
1825 | unregister_blkdev(FLOPPY_MAJOR, "fd"); |
1826 | } | |
1827 | #endif | |
63907435 | 1828 | |
92183b34 GU |
1829 | static struct platform_driver amiga_floppy_driver = { |
1830 | .driver = { | |
1831 | .name = "amiga-floppy", | |
1832 | .owner = THIS_MODULE, | |
1833 | }, | |
1834 | }; | |
1835 | ||
1836 | static int __init amiga_floppy_init(void) | |
1837 | { | |
1838 | return platform_driver_probe(&amiga_floppy_driver, amiga_floppy_probe); | |
1839 | } | |
1840 | ||
1841 | module_init(amiga_floppy_init); | |
1842 | ||
1843 | #ifndef MODULE | |
63907435 AV |
1844 | static int __init amiga_floppy_setup (char *str) |
1845 | { | |
1846 | int n; | |
1847 | if (!MACH_IS_AMIGA) | |
1848 | return 0; | |
1849 | if (!get_option(&str, &n)) | |
1850 | return 0; | |
1851 | printk (KERN_INFO "amiflop: Setting default df0 to %x\n", n); | |
1852 | fd_def_df0 = n; | |
9b41046c | 1853 | return 1; |
63907435 AV |
1854 | } |
1855 | ||
1856 | __setup("floppy=", amiga_floppy_setup); | |
1da177e4 | 1857 | #endif |
92183b34 GU |
1858 | |
1859 | MODULE_ALIAS("platform:amiga-floppy"); |