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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> |
57 | #include <linux/slab.h> |
58 | |
59 | #include <linux/fd.h> |
60 | #include <linux/hdreg.h> |
61 | #include <linux/delay.h> |
62 | #include <linux/init.h> |
63 | #include <linux/mutex.h> |
64 | #include <linux/amifdreg.h> |
65 | #include <linux/amifd.h> |
66 | #include <linux/fs.h> |
67 | #include <linux/blkdev.h> |
68 | #include <linux/elevator.h> |
69 | #include <linux/interrupt.h> |
70 | #include <linux/platform_device.h> |
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 | |
112 | static DEFINE_MUTEX(amiflop_mutex); |
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 | /* |
119 | * Macros |
120 | */ |
121 | #define MOTOR_ON (ciab.prb &= ~DSKMOTOR) |
122 | #define MOTOR_OFF (ciab.prb |= DSKMOTOR) |
123 | #define SELECT(mask) (ciab.prb &= ~mask) |
124 | #define DESELECT(mask) (ciab.prb |= mask) |
125 | #define SELMASK(drive) (1 << (3 + (drive & 3))) |
126 | |
127 | static struct fd_drive_type drive_types[] = { |
128 | /* code name tr he rdsz wrsz sm pc1 pc2 sd st st*/ |
129 | /* warning: times are now in milliseconds (ms) */ |
130 | { FD_DD_3, "DD 3.5", 80, 2, 14716, 13630, 1, 80,161, 3, 18, 1}, |
131 | { FD_HD_3, "HD 3.5", 80, 2, 28344, 27258, 2, 80,161, 3, 18, 1}, |
132 | { FD_DD_5, "DD 5.25", 40, 2, 14716, 13630, 1, 40, 81, 6, 30, 2}, |
133 | { FD_NODRIVE, "No Drive", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} |
134 | }; |
135 | static int num_dr_types = ARRAY_SIZE(drive_types); |
136 | |
137 | static int amiga_read(int), dos_read(int); |
138 | static void amiga_write(int), dos_write(int); |
139 | static struct fd_data_type data_types[] = { |
140 | { "Amiga", 11 , amiga_read, amiga_write}, |
141 | { "MS-Dos", 9, dos_read, dos_write} |
142 | }; |
143 | |
144 | /* current info on each unit */ |
145 | static struct amiga_floppy_struct unit[FD_MAX_UNITS]; |
146 | |
147 | static struct timer_list flush_track_timer[FD_MAX_UNITS]; |
148 | static struct timer_list post_write_timer; |
149 | static struct timer_list motor_on_timer; |
150 | static struct timer_list motor_off_timer[FD_MAX_UNITS]; |
151 | static int on_attempts; |
152 | |
153 | /* Synchronization of FDC access */ |
154 | /* request loop (trackbuffer) */ |
155 | static volatile int fdc_busy = -1; |
156 | static volatile int fdc_nested; |
157 | static DECLARE_WAIT_QUEUE_HEAD(fdc_wait); |
158 | |
159 | static DECLARE_COMPLETION(motor_on_completion); |
160 | |
161 | static volatile int selected = -1; /* currently selected drive */ |
162 | |
163 | static int writepending; |
164 | static int writefromint; |
165 | static char *raw_buf; |
166 | static int fdc_queue; |
167 | |
168 | static DEFINE_SPINLOCK(amiflop_lock); |
169 | |
170 | #define RAW_BUF_SIZE 30000 /* size of raw disk data */ |
171 | |
172 | /* |
173 | * These are global variables, as that's the easiest way to give |
174 | * information to interrupts. They are the data used for the current |
175 | * request. |
176 | */ |
177 | static volatile char block_flag; |
178 | static DECLARE_WAIT_QUEUE_HEAD(wait_fd_block); |
179 | |
180 | /* MS-Dos MFM Coding tables (should go quick and easy) */ |
181 | static unsigned char mfmencode[16]={ |
182 | 0x2a, 0x29, 0x24, 0x25, 0x12, 0x11, 0x14, 0x15, |
183 | 0x4a, 0x49, 0x44, 0x45, 0x52, 0x51, 0x54, 0x55 |
184 | }; |
185 | static unsigned char mfmdecode[128]; |
186 | |
187 | /* floppy internal millisecond timer stuff */ |
188 | static DECLARE_COMPLETION(ms_wait_completion); |
189 | #define MS_TICKS ((amiga_eclock+50)/1000) |
190 | |
191 | /* |
192 | * Note that MAX_ERRORS=X doesn't imply that we retry every bad read |
193 | * max X times - some types of errors increase the errorcount by 2 or |
194 | * even 3, so we might actually retry only X/2 times before giving up. |
195 | */ |
196 | #define MAX_ERRORS 12 |
197 | |
198 | #define custom amiga_custom |
199 | |
200 | /* Prevent "aliased" accesses. */ |
201 | static int fd_ref[4] = { 0,0,0,0 }; |
202 | static int fd_device[4] = { 0, 0, 0, 0 }; |
203 | |
204 | /* |
205 | * Here come the actual hardware access and helper functions. |
206 | * They are not reentrant and single threaded because all drives |
207 | * share the same hardware and the same trackbuffer. |
208 | */ |
209 | |
210 | /* Milliseconds timer */ |
211 | |
212 | static irqreturn_t ms_isr(int irq, void *dummy) |
213 | { |
214 | complete(&ms_wait_completion); |
215 | return IRQ_HANDLED; |
216 | } |
217 | |
218 | /* all waits are queued up |
219 | A more generic routine would do a schedule a la timer.device */ |
220 | static void ms_delay(int ms) |
221 | { |
222 | int ticks; |
223 | static DEFINE_MUTEX(mutex); |
224 | |
225 | if (ms > 0) { |
226 | mutex_lock(&mutex); |
227 | ticks = MS_TICKS*ms-1; |
228 | ciaa.tblo=ticks%256; |
229 | ciaa.tbhi=ticks/256; |
230 | ciaa.crb=0x19; /*count eclock, force load, one-shoot, start */ |
231 | wait_for_completion(&ms_wait_completion); |
232 | mutex_unlock(&mutex); |
233 | } |
234 | } |
235 | |
236 | /* Hardware semaphore */ |
237 | |
238 | /* returns true when we would get the semaphore */ |
239 | static inline int try_fdc(int drive) |
240 | { |
241 | drive &= 3; |
242 | return ((fdc_busy < 0) || (fdc_busy == drive)); |
243 | } |
244 | |
245 | static void get_fdc(int drive) |
246 | { |
247 | unsigned long flags; |
248 | |
249 | drive &= 3; |
250 | #ifdef DEBUG |
251 | printk("get_fdc: drive %d fdc_busy %d fdc_nested %d\n",drive,fdc_busy,fdc_nested); |
252 | #endif |
253 | local_irq_save(flags); |
254 | wait_event(fdc_wait, try_fdc(drive)); |
255 | fdc_busy = drive; |
256 | fdc_nested++; |
257 | local_irq_restore(flags); |
258 | } |
259 | |
260 | static inline void rel_fdc(void) |
261 | { |
262 | #ifdef DEBUG |
263 | if (fdc_nested == 0) |
264 | printk("fd: unmatched rel_fdc\n"); |
265 | printk("rel_fdc: fdc_busy %d fdc_nested %d\n",fdc_busy,fdc_nested); |
266 | #endif |
267 | fdc_nested--; |
268 | if (fdc_nested == 0) { |
269 | fdc_busy = -1; |
270 | wake_up(&fdc_wait); |
271 | } |
272 | } |
273 | |
274 | static void fd_select (int drive) |
275 | { |
276 | unsigned char prb = ~0; |
277 | |
278 | drive&=3; |
279 | #ifdef DEBUG |
280 | printk("selecting %d\n",drive); |
281 | #endif |
282 | if (drive == selected) |
283 | return; |
284 | get_fdc(drive); |
285 | selected = drive; |
286 | |
287 | if (unit[drive].track % 2 != 0) |
288 | prb &= ~DSKSIDE; |
289 | if (unit[drive].motor == 1) |
290 | prb &= ~DSKMOTOR; |
291 | ciab.prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3)); |
292 | ciab.prb = prb; |
293 | prb &= ~SELMASK(drive); |
294 | ciab.prb = prb; |
295 | rel_fdc(); |
296 | } |
297 | |
298 | static void fd_deselect (int drive) |
299 | { |
300 | unsigned char prb; |
301 | unsigned long flags; |
302 | |
303 | drive&=3; |
304 | #ifdef DEBUG |
305 | printk("deselecting %d\n",drive); |
306 | #endif |
307 | if (drive != selected) { |
308 | printk(KERN_WARNING "Deselecting drive %d while %d was selected!\n",drive,selected); |
309 | return; |
310 | } |
311 | |
312 | get_fdc(drive); |
313 | local_irq_save(flags); |
314 | |
315 | selected = -1; |
316 | |
317 | prb = ciab.prb; |
318 | prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3)); |
319 | ciab.prb = prb; |
320 | |
321 | local_irq_restore (flags); |
322 | rel_fdc(); |
323 | |
324 | } |
325 | |
326 | static void motor_on_callback(unsigned long nr) |
327 | { |
328 | if (!(ciaa.pra & DSKRDY) || --on_attempts == 0) { |
329 | complete_all(&motor_on_completion); |
330 | } else { |
331 | motor_on_timer.expires = jiffies + HZ/10; |
332 | add_timer(&motor_on_timer); |
333 | } |
334 | } |
335 | |
336 | static int fd_motor_on(int nr) |
337 | { |
338 | nr &= 3; |
339 | |
340 | del_timer(motor_off_timer + nr); |
341 | |
342 | if (!unit[nr].motor) { |
343 | unit[nr].motor = 1; |
344 | fd_select(nr); |
345 | |
346 | INIT_COMPLETION(motor_on_completion); |
347 | motor_on_timer.data = nr; |
348 | mod_timer(&motor_on_timer, jiffies + HZ/2); |
349 | |
350 | on_attempts = 10; |
351 | wait_for_completion(&motor_on_completion); |
352 | fd_deselect(nr); |
353 | } |
354 | |
355 | if (on_attempts == 0) { |
356 | on_attempts = -1; |
357 | #if 0 |
358 | printk (KERN_ERR "motor_on failed, turning motor off\n"); |
359 | fd_motor_off (nr); |
360 | return 0; |
361 | #else |
362 | printk (KERN_WARNING "DSKRDY not set after 1.5 seconds - assuming drive is spinning notwithstanding\n"); |
363 | #endif |
364 | } |
365 | |
366 | return 1; |
367 | } |
368 | |
369 | static void fd_motor_off(unsigned long drive) |
370 | { |
371 | long calledfromint; |
372 | #ifdef MODULE |
373 | long decusecount; |
374 | |
375 | decusecount = drive & 0x40000000; |
376 | #endif |
377 | calledfromint = drive & 0x80000000; |
378 | drive&=3; |
379 | if (calledfromint && !try_fdc(drive)) { |
380 | /* We would be blocked in an interrupt, so try again later */ |
381 | motor_off_timer[drive].expires = jiffies + 1; |
382 | add_timer(motor_off_timer + drive); |
383 | return; |
384 | } |
385 | unit[drive].motor = 0; |
386 | fd_select(drive); |
387 | udelay (1); |
388 | fd_deselect(drive); |
389 | } |
390 | |
391 | static void floppy_off (unsigned int nr) |
392 | { |
393 | int drive; |
394 | |
395 | drive = nr & 3; |
396 | /* called this way it is always from interrupt */ |
397 | motor_off_timer[drive].data = nr | 0x80000000; |
398 | mod_timer(motor_off_timer + drive, jiffies + 3*HZ); |
399 | } |
400 | |
401 | static int fd_calibrate(int drive) |
402 | { |
403 | unsigned char prb; |
404 | int n; |
405 | |
406 | drive &= 3; |
407 | get_fdc(drive); |
408 | if (!fd_motor_on (drive)) |
409 | return 0; |
410 | fd_select (drive); |
411 | prb = ciab.prb; |
412 | prb |= DSKSIDE; |
413 | prb &= ~DSKDIREC; |
414 | ciab.prb = prb; |
415 | for (n = unit[drive].type->tracks/2; n != 0; --n) { |
416 | if (ciaa.pra & DSKTRACK0) |
417 | break; |
418 | prb &= ~DSKSTEP; |
419 | ciab.prb = prb; |
420 | prb |= DSKSTEP; |
421 | udelay (2); |
422 | ciab.prb = prb; |
423 | ms_delay(unit[drive].type->step_delay); |
424 | } |
425 | ms_delay (unit[drive].type->settle_time); |
426 | prb |= DSKDIREC; |
427 | n = unit[drive].type->tracks + 20; |
428 | for (;;) { |
429 | prb &= ~DSKSTEP; |
430 | ciab.prb = prb; |
431 | prb |= DSKSTEP; |
432 | udelay (2); |
433 | ciab.prb = prb; |
434 | ms_delay(unit[drive].type->step_delay + 1); |
435 | if ((ciaa.pra & DSKTRACK0) == 0) |
436 | break; |
437 | if (--n == 0) { |
438 | printk (KERN_ERR "fd%d: calibrate failed, turning motor off\n", drive); |
439 | fd_motor_off (drive); |
440 | unit[drive].track = -1; |
441 | rel_fdc(); |
442 | return 0; |
443 | } |
444 | } |
445 | unit[drive].track = 0; |
446 | ms_delay(unit[drive].type->settle_time); |
447 | |
448 | rel_fdc(); |
449 | fd_deselect(drive); |
450 | return 1; |
451 | } |
452 | |
453 | static int fd_seek(int drive, int track) |
454 | { |
455 | unsigned char prb; |
456 | int cnt; |
457 | |
458 | #ifdef DEBUG |
459 | printk("seeking drive %d to track %d\n",drive,track); |
460 | #endif |
461 | drive &= 3; |
462 | get_fdc(drive); |
463 | if (unit[drive].track == track) { |
464 | rel_fdc(); |
465 | return 1; |
466 | } |
467 | if (!fd_motor_on(drive)) { |
468 | rel_fdc(); |
469 | return 0; |
470 | } |
471 | if (unit[drive].track < 0 && !fd_calibrate(drive)) { |
472 | rel_fdc(); |
473 | return 0; |
474 | } |
475 | |
476 | fd_select (drive); |
477 | cnt = unit[drive].track/2 - track/2; |
478 | prb = ciab.prb; |
479 | prb |= DSKSIDE | DSKDIREC; |
480 | if (track % 2 != 0) |
481 | prb &= ~DSKSIDE; |
482 | if (cnt < 0) { |
483 | cnt = - cnt; |
484 | prb &= ~DSKDIREC; |
485 | } |
486 | ciab.prb = prb; |
487 | if (track % 2 != unit[drive].track % 2) |
488 | ms_delay (unit[drive].type->side_time); |
489 | unit[drive].track = track; |
490 | if (cnt == 0) { |
491 | rel_fdc(); |
492 | fd_deselect(drive); |
493 | return 1; |
494 | } |
495 | do { |
496 | prb &= ~DSKSTEP; |
497 | ciab.prb = prb; |
498 | prb |= DSKSTEP; |
499 | udelay (1); |
500 | ciab.prb = prb; |
501 | ms_delay (unit[drive].type->step_delay); |
502 | } while (--cnt != 0); |
503 | ms_delay (unit[drive].type->settle_time); |
504 | |
505 | rel_fdc(); |
506 | fd_deselect(drive); |
507 | return 1; |
508 | } |
509 | |
510 | static unsigned long fd_get_drive_id(int drive) |
511 | { |
512 | int i; |
513 | ulong id = 0; |
514 | |
515 | drive&=3; |
516 | get_fdc(drive); |
517 | /* set up for ID */ |
518 | MOTOR_ON; |
519 | udelay(2); |
520 | SELECT(SELMASK(drive)); |
521 | udelay(2); |
522 | DESELECT(SELMASK(drive)); |
523 | udelay(2); |
524 | MOTOR_OFF; |
525 | udelay(2); |
526 | SELECT(SELMASK(drive)); |
527 | udelay(2); |
528 | DESELECT(SELMASK(drive)); |
529 | udelay(2); |
530 | |
531 | /* loop and read disk ID */ |
532 | for (i=0; i<32; i++) { |
533 | SELECT(SELMASK(drive)); |
534 | udelay(2); |
535 | |
536 | /* read and store value of DSKRDY */ |
537 | id <<= 1; |
538 | id |= (ciaa.pra & DSKRDY) ? 0 : 1; /* cia regs are low-active! */ |
539 | |
540 | DESELECT(SELMASK(drive)); |
541 | } |
542 | |
543 | rel_fdc(); |
544 | |
545 | /* |
546 | * RB: At least A500/A2000's df0: don't identify themselves. |
547 | * As every (real) Amiga has at least a 3.5" DD drive as df0: |
548 | * we default to that if df0: doesn't identify as a certain |
549 | * type. |
550 | */ |
551 | if(drive == 0 && id == FD_NODRIVE) |
552 | { |
553 | id = fd_def_df0; |
554 | printk(KERN_NOTICE "fd: drive 0 didn't identify, setting default %08lx\n", (ulong)fd_def_df0); |
555 | } |
556 | /* return the ID value */ |
557 | return (id); |
558 | } |
559 | |
560 | static irqreturn_t fd_block_done(int irq, void *dummy) |
561 | { |
562 | if (block_flag) |
563 | custom.dsklen = 0x4000; |
564 | |
565 | if (block_flag == 2) { /* writing */ |
566 | writepending = 2; |
567 | post_write_timer.expires = jiffies + 1; /* at least 2 ms */ |
568 | post_write_timer.data = selected; |
569 | add_timer(&post_write_timer); |
570 | } |
571 | else { /* reading */ |
572 | block_flag = 0; |
573 | wake_up (&wait_fd_block); |
574 | } |
575 | return IRQ_HANDLED; |
576 | } |
577 | |
578 | static void raw_read(int drive) |
579 | { |
580 | drive&=3; |
581 | get_fdc(drive); |
582 | wait_event(wait_fd_block, !block_flag); |
583 | fd_select(drive); |
584 | /* setup adkcon bits correctly */ |
585 | custom.adkcon = ADK_MSBSYNC; |
586 | custom.adkcon = ADK_SETCLR|ADK_WORDSYNC|ADK_FAST; |
587 | |
588 | custom.dsksync = MFM_SYNC; |
589 | |
590 | custom.dsklen = 0; |
591 | custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf); |
592 | custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN; |
593 | custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN; |
594 | |
595 | block_flag = 1; |
596 | |
597 | wait_event(wait_fd_block, !block_flag); |
598 | |
599 | custom.dsklen = 0; |
600 | fd_deselect(drive); |
601 | rel_fdc(); |
602 | } |
603 | |
604 | static int raw_write(int drive) |
605 | { |
606 | ushort adk; |
607 | |
608 | drive&=3; |
609 | get_fdc(drive); /* corresponds to rel_fdc() in post_write() */ |
610 | if ((ciaa.pra & DSKPROT) == 0) { |
611 | rel_fdc(); |
612 | return 0; |
613 | } |
614 | wait_event(wait_fd_block, !block_flag); |
615 | fd_select(drive); |
616 | /* clear adkcon bits */ |
617 | custom.adkcon = ADK_PRECOMP1|ADK_PRECOMP0|ADK_WORDSYNC|ADK_MSBSYNC; |
618 | /* set appropriate adkcon bits */ |
619 | adk = ADK_SETCLR|ADK_FAST; |
620 | if ((ulong)unit[drive].track >= unit[drive].type->precomp2) |
621 | adk |= ADK_PRECOMP1; |
622 | else if ((ulong)unit[drive].track >= unit[drive].type->precomp1) |
623 | adk |= ADK_PRECOMP0; |
624 | custom.adkcon = adk; |
625 | |
626 | custom.dsklen = DSKLEN_WRITE; |
627 | custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf); |
628 | custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE; |
629 | custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE; |
630 | |
631 | block_flag = 2; |
632 | return 1; |
633 | } |
634 | |
635 | /* |
636 | * to be called at least 2ms after the write has finished but before any |
637 | * other access to the hardware. |
638 | */ |
639 | static void post_write (unsigned long drive) |
640 | { |
641 | #ifdef DEBUG |
642 | printk("post_write for drive %ld\n",drive); |
643 | #endif |
644 | drive &= 3; |
645 | custom.dsklen = 0; |
646 | block_flag = 0; |
647 | writepending = 0; |
648 | writefromint = 0; |
649 | unit[drive].dirty = 0; |
650 | wake_up(&wait_fd_block); |
651 | fd_deselect(drive); |
652 | rel_fdc(); /* corresponds to get_fdc() in raw_write */ |
653 | } |
654 | |
655 | |
656 | /* |
657 | * The following functions are to convert the block contents into raw data |
658 | * written to disk and vice versa. |
659 | * (Add other formats here ;-)) |
660 | */ |
661 | |
662 | static unsigned long scan_sync(unsigned long raw, unsigned long end) |
663 | { |
664 | ushort *ptr = (ushort *)raw, *endp = (ushort *)end; |
665 | |
666 | while (ptr < endp && *ptr++ != 0x4489) |
667 | ; |
668 | if (ptr < endp) { |
669 | while (*ptr == 0x4489 && ptr < endp) |
670 | ptr++; |
671 | return (ulong)ptr; |
672 | } |
673 | return 0; |
674 | } |
675 | |
676 | static inline unsigned long checksum(unsigned long *addr, int len) |
677 | { |
678 | unsigned long csum = 0; |
679 | |
680 | len /= sizeof(*addr); |
681 | while (len-- > 0) |
682 | csum ^= *addr++; |
683 | csum = ((csum>>1) & 0x55555555) ^ (csum & 0x55555555); |
684 | |
685 | return csum; |
686 | } |
687 | |
688 | static unsigned long decode (unsigned long *data, unsigned long *raw, |
689 | int len) |
690 | { |
691 | ulong *odd, *even; |
692 | |
693 | /* convert length from bytes to longwords */ |
694 | len >>= 2; |
695 | odd = raw; |
696 | even = odd + len; |
697 | |
698 | /* prepare return pointer */ |
699 | raw += len * 2; |
700 | |
701 | do { |
702 | *data++ = ((*odd++ & 0x55555555) << 1) | (*even++ & 0x55555555); |
703 | } while (--len != 0); |
704 | |
705 | return (ulong)raw; |
706 | } |
707 | |
708 | struct header { |
709 | unsigned char magic; |
710 | unsigned char track; |
711 | unsigned char sect; |
712 | unsigned char ord; |
713 | unsigned char labels[16]; |
714 | unsigned long hdrchk; |
715 | unsigned long datachk; |
716 | }; |
717 | |
718 | static int amiga_read(int drive) |
719 | { |
720 | unsigned long raw; |
721 | unsigned long end; |
722 | int scnt; |
723 | unsigned long csum; |
724 | struct header hdr; |
725 | |
726 | drive&=3; |
727 | raw = (long) raw_buf; |
728 | end = raw + unit[drive].type->read_size; |
729 | |
730 | for (scnt = 0;scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) { |
731 | if (!(raw = scan_sync(raw, end))) { |
732 | printk (KERN_INFO "can't find sync for sector %d\n", scnt); |
733 | return MFM_NOSYNC; |
734 | } |
735 | |
736 | raw = decode ((ulong *)&hdr.magic, (ulong *)raw, 4); |
737 | raw = decode ((ulong *)&hdr.labels, (ulong *)raw, 16); |
738 | raw = decode ((ulong *)&hdr.hdrchk, (ulong *)raw, 4); |
739 | raw = decode ((ulong *)&hdr.datachk, (ulong *)raw, 4); |
740 | csum = checksum((ulong *)&hdr, |
741 | (char *)&hdr.hdrchk-(char *)&hdr); |
742 | |
743 | #ifdef DEBUG |
744 | printk ("(%x,%d,%d,%d) (%lx,%lx,%lx,%lx) %lx %lx\n", |
745 | hdr.magic, hdr.track, hdr.sect, hdr.ord, |
746 | *(ulong *)&hdr.labels[0], *(ulong *)&hdr.labels[4], |
747 | *(ulong *)&hdr.labels[8], *(ulong *)&hdr.labels[12], |
748 | hdr.hdrchk, hdr.datachk); |
749 | #endif |
750 | |
751 | if (hdr.hdrchk != csum) { |
752 | printk(KERN_INFO "MFM_HEADER: %08lx,%08lx\n", hdr.hdrchk, csum); |
753 | return MFM_HEADER; |
754 | } |
755 | |
756 | /* verify track */ |
757 | if (hdr.track != unit[drive].track) { |
758 | printk(KERN_INFO "MFM_TRACK: %d, %d\n", hdr.track, unit[drive].track); |
759 | return MFM_TRACK; |
760 | } |
761 | |
762 | raw = decode ((ulong *)(unit[drive].trackbuf + hdr.sect*512), |
763 | (ulong *)raw, 512); |
764 | csum = checksum((ulong *)(unit[drive].trackbuf + hdr.sect*512), 512); |
765 | |
766 | if (hdr.datachk != csum) { |
767 | printk(KERN_INFO "MFM_DATA: (%x:%d:%d:%d) sc=%d %lx, %lx\n", |
768 | hdr.magic, hdr.track, hdr.sect, hdr.ord, scnt, |
769 | hdr.datachk, csum); |
770 | printk (KERN_INFO "data=(%lx,%lx,%lx,%lx)\n", |
771 | ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[0], |
772 | ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[1], |
773 | ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[2], |
774 | ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[3]); |
775 | return MFM_DATA; |
776 | } |
777 | } |
778 | |
779 | return 0; |
780 | } |
781 | |
782 | static void encode(unsigned long data, unsigned long *dest) |
783 | { |
784 | unsigned long data2; |
785 | |
786 | data &= 0x55555555; |
787 | data2 = data ^ 0x55555555; |
788 | data |= ((data2 >> 1) | 0x80000000) & (data2 << 1); |
789 | |
790 | if (*(dest - 1) & 0x00000001) |
791 | data &= 0x7FFFFFFF; |
792 | |
793 | *dest = data; |
794 | } |
795 | |
796 | static void encode_block(unsigned long *dest, unsigned long *src, int len) |
797 | { |
798 | int cnt, to_cnt = 0; |
799 | unsigned long data; |
800 | |
801 | /* odd bits */ |
802 | for (cnt = 0; cnt < len / 4; cnt++) { |
803 | data = src[cnt] >> 1; |
804 | encode(data, dest + to_cnt++); |
805 | } |
806 | |
807 | /* even bits */ |
808 | for (cnt = 0; cnt < len / 4; cnt++) { |
809 | data = src[cnt]; |
810 | encode(data, dest + to_cnt++); |
811 | } |
812 | } |
813 | |
814 | static unsigned long *putsec(int disk, unsigned long *raw, int cnt) |
815 | { |
816 | struct header hdr; |
817 | int i; |
818 | |
819 | disk&=3; |
820 | *raw = (raw[-1]&1) ? 0x2AAAAAAA : 0xAAAAAAAA; |
821 | raw++; |
822 | *raw++ = 0x44894489; |
823 | |
824 | hdr.magic = 0xFF; |
825 | hdr.track = unit[disk].track; |
826 | hdr.sect = cnt; |
827 | hdr.ord = unit[disk].dtype->sects * unit[disk].type->sect_mult - cnt; |
828 | for (i = 0; i < 16; i++) |
829 | hdr.labels[i] = 0; |
830 | hdr.hdrchk = checksum((ulong *)&hdr, |
831 | (char *)&hdr.hdrchk-(char *)&hdr); |
832 | hdr.datachk = checksum((ulong *)(unit[disk].trackbuf+cnt*512), 512); |
833 | |
834 | encode_block(raw, (ulong *)&hdr.magic, 4); |
835 | raw += 2; |
836 | encode_block(raw, (ulong *)&hdr.labels, 16); |
837 | raw += 8; |
838 | encode_block(raw, (ulong *)&hdr.hdrchk, 4); |
839 | raw += 2; |
840 | encode_block(raw, (ulong *)&hdr.datachk, 4); |
841 | raw += 2; |
842 | encode_block(raw, (ulong *)(unit[disk].trackbuf+cnt*512), 512); |
843 | raw += 256; |
844 | |
845 | return raw; |
846 | } |
847 | |
848 | static void amiga_write(int disk) |
849 | { |
850 | unsigned int cnt; |
851 | unsigned long *ptr = (unsigned long *)raw_buf; |
852 | |
853 | disk&=3; |
854 | /* gap space */ |
855 | for (cnt = 0; cnt < 415 * unit[disk].type->sect_mult; cnt++) |
856 | *ptr++ = 0xaaaaaaaa; |
857 | |
858 | /* sectors */ |
859 | for (cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++) |
860 | ptr = putsec (disk, ptr, cnt); |
861 | *(ushort *)ptr = (ptr[-1]&1) ? 0x2AA8 : 0xAAA8; |
862 | } |
863 | |
864 | |
865 | struct dos_header { |
866 | unsigned char track, /* 0-80 */ |
867 | side, /* 0-1 */ |
868 | sec, /* 0-...*/ |
869 | len_desc;/* 2 */ |
870 | unsigned short crc; /* on 68000 we got an alignment problem, |
871 | but this compiler solves it by adding silently |
872 | adding a pad byte so data won't fit |
873 | and this took about 3h to discover.... */ |
874 | unsigned char gap1[22]; /* for longword-alignedness (0x4e) */ |
875 | }; |
876 | |
877 | /* crc routines are borrowed from the messydos-handler */ |
878 | |
879 | /* excerpt from the messydos-device |
880 | ; The CRC is computed not only over the actual data, but including |
881 | ; the SYNC mark (3 * $a1) and the 'ID/DATA - Address Mark' ($fe/$fb). |
882 | ; As we don't read or encode these fields into our buffers, we have to |
883 | ; preload the registers containing the CRC with the values they would have |
884 | ; after stepping over these fields. |
885 | ; |
886 | ; How CRCs "really" work: |
887 | ; |
888 | ; First, you should regard a bitstring as a series of coefficients of |
889 | ; polynomials. We calculate with these polynomials in modulo-2 |
890 | ; arithmetic, in which both add and subtract are done the same as |
891 | ; exclusive-or. Now, we modify our data (a very long polynomial) in |
892 | ; such a way that it becomes divisible by the CCITT-standard 16-bit |
893 | ; 16 12 5 |
894 | ; polynomial: x + x + x + 1, represented by $11021. The easiest |
895 | ; way to do this would be to multiply (using proper arithmetic) our |
896 | ; datablock with $11021. So we have: |
897 | ; data * $11021 = |
898 | ; data * ($10000 + $1021) = |
899 | ; data * $10000 + data * $1021 |
900 | ; The left part of this is simple: Just add two 0 bytes. But then |
901 | ; the right part (data $1021) remains difficult and even could have |
902 | ; a carry into the left part. The solution is to use a modified |
903 | ; multiplication, which has a result that is not correct, but with |
904 | ; a difference of any multiple of $11021. We then only need to keep |
905 | ; the 16 least significant bits of the result. |
906 | ; |
907 | ; The following algorithm does this for us: |
908 | ; |
909 | ; unsigned char *data, c, crclo, crchi; |
910 | ; while (not done) { |
911 | ; c = *data++ + crchi; |
912 | ; crchi = (@ c) >> 8 + crclo; |
913 | ; crclo = @ c; |
914 | ; } |
915 | ; |
916 | ; Remember, + is done with EOR, the @ operator is in two tables (high |
917 | ; and low byte separately), which is calculated as |
918 | ; |
919 | ; $1021 * (c & $F0) |
920 | ; xor $1021 * (c & $0F) |
921 | ; xor $1021 * (c >> 4) (* is regular multiplication) |
922 | ; |
923 | ; |
924 | ; Anyway, the end result is the same as the remainder of the division of |
925 | ; the data by $11021. I am afraid I need to study theory a bit more... |
926 | |
927 | |
928 | my only works was to code this from manx to C.... |
929 | |
930 | */ |
931 | |
932 | static ushort dos_crc(void * data_a3, int data_d0, int data_d1, int data_d3) |
933 | { |
934 | static unsigned char CRCTable1[] = { |
935 | 0x00,0x10,0x20,0x30,0x40,0x50,0x60,0x70,0x81,0x91,0xa1,0xb1,0xc1,0xd1,0xe1,0xf1, |
936 | 0x12,0x02,0x32,0x22,0x52,0x42,0x72,0x62,0x93,0x83,0xb3,0xa3,0xd3,0xc3,0xf3,0xe3, |
937 | 0x24,0x34,0x04,0x14,0x64,0x74,0x44,0x54,0xa5,0xb5,0x85,0x95,0xe5,0xf5,0xc5,0xd5, |
938 | 0x36,0x26,0x16,0x06,0x76,0x66,0x56,0x46,0xb7,0xa7,0x97,0x87,0xf7,0xe7,0xd7,0xc7, |
939 | 0x48,0x58,0x68,0x78,0x08,0x18,0x28,0x38,0xc9,0xd9,0xe9,0xf9,0x89,0x99,0xa9,0xb9, |
940 | 0x5a,0x4a,0x7a,0x6a,0x1a,0x0a,0x3a,0x2a,0xdb,0xcb,0xfb,0xeb,0x9b,0x8b,0xbb,0xab, |
941 | 0x6c,0x7c,0x4c,0x5c,0x2c,0x3c,0x0c,0x1c,0xed,0xfd,0xcd,0xdd,0xad,0xbd,0x8d,0x9d, |
942 | 0x7e,0x6e,0x5e,0x4e,0x3e,0x2e,0x1e,0x0e,0xff,0xef,0xdf,0xcf,0xbf,0xaf,0x9f,0x8f, |
943 | 0x91,0x81,0xb1,0xa1,0xd1,0xc1,0xf1,0xe1,0x10,0x00,0x30,0x20,0x50,0x40,0x70,0x60, |
944 | 0x83,0x93,0xa3,0xb3,0xc3,0xd3,0xe3,0xf3,0x02,0x12,0x22,0x32,0x42,0x52,0x62,0x72, |
945 | 0xb5,0xa5,0x95,0x85,0xf5,0xe5,0xd5,0xc5,0x34,0x24,0x14,0x04,0x74,0x64,0x54,0x44, |
946 | 0xa7,0xb7,0x87,0x97,0xe7,0xf7,0xc7,0xd7,0x26,0x36,0x06,0x16,0x66,0x76,0x46,0x56, |
947 | 0xd9,0xc9,0xf9,0xe9,0x99,0x89,0xb9,0xa9,0x58,0x48,0x78,0x68,0x18,0x08,0x38,0x28, |
948 | 0xcb,0xdb,0xeb,0xfb,0x8b,0x9b,0xab,0xbb,0x4a,0x5a,0x6a,0x7a,0x0a,0x1a,0x2a,0x3a, |
949 | 0xfd,0xed,0xdd,0xcd,0xbd,0xad,0x9d,0x8d,0x7c,0x6c,0x5c,0x4c,0x3c,0x2c,0x1c,0x0c, |
950 | 0xef,0xff,0xcf,0xdf,0xaf,0xbf,0x8f,0x9f,0x6e,0x7e,0x4e,0x5e,0x2e,0x3e,0x0e,0x1e |
951 | }; |
952 | |
953 | static unsigned char CRCTable2[] = { |
954 | 0x00,0x21,0x42,0x63,0x84,0xa5,0xc6,0xe7,0x08,0x29,0x4a,0x6b,0x8c,0xad,0xce,0xef, |
955 | 0x31,0x10,0x73,0x52,0xb5,0x94,0xf7,0xd6,0x39,0x18,0x7b,0x5a,0xbd,0x9c,0xff,0xde, |
956 | 0x62,0x43,0x20,0x01,0xe6,0xc7,0xa4,0x85,0x6a,0x4b,0x28,0x09,0xee,0xcf,0xac,0x8d, |
957 | 0x53,0x72,0x11,0x30,0xd7,0xf6,0x95,0xb4,0x5b,0x7a,0x19,0x38,0xdf,0xfe,0x9d,0xbc, |
958 | 0xc4,0xe5,0x86,0xa7,0x40,0x61,0x02,0x23,0xcc,0xed,0x8e,0xaf,0x48,0x69,0x0a,0x2b, |
959 | 0xf5,0xd4,0xb7,0x96,0x71,0x50,0x33,0x12,0xfd,0xdc,0xbf,0x9e,0x79,0x58,0x3b,0x1a, |
960 | 0xa6,0x87,0xe4,0xc5,0x22,0x03,0x60,0x41,0xae,0x8f,0xec,0xcd,0x2a,0x0b,0x68,0x49, |
961 | 0x97,0xb6,0xd5,0xf4,0x13,0x32,0x51,0x70,0x9f,0xbe,0xdd,0xfc,0x1b,0x3a,0x59,0x78, |
962 | 0x88,0xa9,0xca,0xeb,0x0c,0x2d,0x4e,0x6f,0x80,0xa1,0xc2,0xe3,0x04,0x25,0x46,0x67, |
963 | 0xb9,0x98,0xfb,0xda,0x3d,0x1c,0x7f,0x5e,0xb1,0x90,0xf3,0xd2,0x35,0x14,0x77,0x56, |
964 | 0xea,0xcb,0xa8,0x89,0x6e,0x4f,0x2c,0x0d,0xe2,0xc3,0xa0,0x81,0x66,0x47,0x24,0x05, |
965 | 0xdb,0xfa,0x99,0xb8,0x5f,0x7e,0x1d,0x3c,0xd3,0xf2,0x91,0xb0,0x57,0x76,0x15,0x34, |
966 | 0x4c,0x6d,0x0e,0x2f,0xc8,0xe9,0x8a,0xab,0x44,0x65,0x06,0x27,0xc0,0xe1,0x82,0xa3, |
967 | 0x7d,0x5c,0x3f,0x1e,0xf9,0xd8,0xbb,0x9a,0x75,0x54,0x37,0x16,0xf1,0xd0,0xb3,0x92, |
968 | 0x2e,0x0f,0x6c,0x4d,0xaa,0x8b,0xe8,0xc9,0x26,0x07,0x64,0x45,0xa2,0x83,0xe0,0xc1, |
969 | 0x1f,0x3e,0x5d,0x7c,0x9b,0xba,0xd9,0xf8,0x17,0x36,0x55,0x74,0x93,0xb2,0xd1,0xf0 |
970 | }; |
971 | |
972 | /* look at the asm-code - what looks in C a bit strange is almost as good as handmade */ |
973 | register int i; |
974 | register unsigned char *CRCT1, *CRCT2, *data, c, crch, crcl; |
975 | |
976 | CRCT1=CRCTable1; |
977 | CRCT2=CRCTable2; |
978 | data=data_a3; |
979 | crcl=data_d1; |
980 | crch=data_d0; |
981 | for (i=data_d3; i>=0; i--) { |
982 | c = (*data++) ^ crch; |
983 | crch = CRCT1[c] ^ crcl; |
984 | crcl = CRCT2[c]; |
985 | } |
986 | return (crch<<8)|crcl; |
987 | } |
988 | |
989 | static inline ushort dos_hdr_crc (struct dos_header *hdr) |
990 | { |
991 | return dos_crc(&(hdr->track), 0xb2, 0x30, 3); /* precomputed magic */ |
992 | } |
993 | |
994 | static inline ushort dos_data_crc(unsigned char *data) |
995 | { |
996 | return dos_crc(data, 0xe2, 0x95 ,511); /* precomputed magic */ |
997 | } |
998 | |
999 | static inline unsigned char dos_decode_byte(ushort word) |
1000 | { |
1001 | register ushort w2; |
1002 | register unsigned char byte; |
1003 | register unsigned char *dec = mfmdecode; |
1004 | |
1005 | w2=word; |
1006 | w2>>=8; |
1007 | w2&=127; |
1008 | byte = dec[w2]; |
1009 | byte <<= 4; |
1010 | w2 = word & 127; |
1011 | byte |= dec[w2]; |
1012 | return byte; |
1013 | } |
1014 | |
1015 | static unsigned long dos_decode(unsigned char *data, unsigned short *raw, int len) |
1016 | { |
1017 | int i; |
1018 | |
1019 | for (i = 0; i < len; i++) |
1020 | *data++=dos_decode_byte(*raw++); |
1021 | return ((ulong)raw); |
1022 | } |
1023 | |
1024 | #ifdef DEBUG |
1025 | static void dbg(unsigned long ptr) |
1026 | { |
1027 | printk("raw data @%08lx: %08lx, %08lx ,%08lx, %08lx\n", ptr, |
1028 | ((ulong *)ptr)[0], ((ulong *)ptr)[1], |
1029 | ((ulong *)ptr)[2], ((ulong *)ptr)[3]); |
1030 | } |
1031 | #endif |
1032 | |
1033 | static int dos_read(int drive) |
1034 | { |
1035 | unsigned long end; |
1036 | unsigned long raw; |
1037 | int scnt; |
1038 | unsigned short crc,data_crc[2]; |
1039 | struct dos_header hdr; |
1040 | |
1041 | drive&=3; |
1042 | raw = (long) raw_buf; |
1043 | end = raw + unit[drive].type->read_size; |
1044 | |
1045 | for (scnt=0; scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) { |
1046 | do { /* search for the right sync of each sec-hdr */ |
1047 | if (!(raw = scan_sync (raw, end))) { |
1048 | printk(KERN_INFO "dos_read: no hdr sync on " |
1049 | "track %d, unit %d for sector %d\n", |
1050 | unit[drive].track,drive,scnt); |
1051 | return MFM_NOSYNC; |
1052 | } |
1053 | #ifdef DEBUG |
1054 | dbg(raw); |
1055 | #endif |
1056 | } while (*((ushort *)raw)!=0x5554); /* loop usually only once done */ |
1057 | raw+=2; /* skip over headermark */ |
1058 | raw = dos_decode((unsigned char *)&hdr,(ushort *) raw,8); |
1059 | crc = dos_hdr_crc(&hdr); |
1060 | |
1061 | #ifdef DEBUG |
1062 | printk("(%3d,%d,%2d,%d) %x\n", hdr.track, hdr.side, |
1063 | hdr.sec, hdr.len_desc, hdr.crc); |
1064 | #endif |
1065 | |
1066 | if (crc != hdr.crc) { |
1067 | printk(KERN_INFO "dos_read: MFM_HEADER %04x,%04x\n", |
1068 | hdr.crc, crc); |
1069 | return MFM_HEADER; |
1070 | } |
1071 | if (hdr.track != unit[drive].track/unit[drive].type->heads) { |
1072 | printk(KERN_INFO "dos_read: MFM_TRACK %d, %d\n", |
1073 | hdr.track, |
1074 | unit[drive].track/unit[drive].type->heads); |
1075 | return MFM_TRACK; |
1076 | } |
1077 | |
1078 | if (hdr.side != unit[drive].track%unit[drive].type->heads) { |
1079 | printk(KERN_INFO "dos_read: MFM_SIDE %d, %d\n", |
1080 | hdr.side, |
1081 | unit[drive].track%unit[drive].type->heads); |
1082 | return MFM_TRACK; |
1083 | } |
1084 | |
1085 | if (hdr.len_desc != 2) { |
1086 | printk(KERN_INFO "dos_read: unknown sector len " |
1087 | "descriptor %d\n", hdr.len_desc); |
1088 | return MFM_DATA; |
1089 | } |
1090 | #ifdef DEBUG |
1091 | printk("hdr accepted\n"); |
1092 | #endif |
1093 | if (!(raw = scan_sync (raw, end))) { |
1094 | printk(KERN_INFO "dos_read: no data sync on track " |
1095 | "%d, unit %d for sector%d, disk sector %d\n", |
1096 | unit[drive].track, drive, scnt, hdr.sec); |
1097 | return MFM_NOSYNC; |
1098 | } |
1099 | #ifdef DEBUG |
1100 | dbg(raw); |
1101 | #endif |
1102 | |
1103 | if (*((ushort *)raw)!=0x5545) { |
1104 | printk(KERN_INFO "dos_read: no data mark after " |
1105 | "sync (%d,%d,%d,%d) sc=%d\n", |
1106 | hdr.track,hdr.side,hdr.sec,hdr.len_desc,scnt); |
1107 | return MFM_NOSYNC; |
1108 | } |
1109 | |
1110 | raw+=2; /* skip data mark (included in checksum) */ |
1111 | raw = dos_decode((unsigned char *)(unit[drive].trackbuf + (hdr.sec - 1) * 512), (ushort *) raw, 512); |
1112 | raw = dos_decode((unsigned char *)data_crc,(ushort *) raw,4); |
1113 | crc = dos_data_crc(unit[drive].trackbuf + (hdr.sec - 1) * 512); |
1114 | |
1115 | if (crc != data_crc[0]) { |
1116 | printk(KERN_INFO "dos_read: MFM_DATA (%d,%d,%d,%d) " |
1117 | "sc=%d, %x %x\n", hdr.track, hdr.side, |
1118 | hdr.sec, hdr.len_desc, scnt,data_crc[0], crc); |
1119 | printk(KERN_INFO "data=(%lx,%lx,%lx,%lx,...)\n", |
1120 | ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[0], |
1121 | ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[1], |
1122 | ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[2], |
1123 | ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[3]); |
1124 | return MFM_DATA; |
1125 | } |
1126 | } |
1127 | return 0; |
1128 | } |
1129 | |
1130 | static inline ushort dos_encode_byte(unsigned char byte) |
1131 | { |
1132 | register unsigned char *enc, b2, b1; |
1133 | register ushort word; |
1134 | |
1135 | enc=mfmencode; |
1136 | b1=byte; |
1137 | b2=b1>>4; |
1138 | b1&=15; |
1139 | word=enc[b2] <<8 | enc [b1]; |
1140 | return (word|((word&(256|64)) ? 0: 128)); |
1141 | } |
1142 | |
1143 | static void dos_encode_block(ushort *dest, unsigned char *src, int len) |
1144 | { |
1145 | int i; |
1146 | |
1147 | for (i = 0; i < len; i++) { |
1148 | *dest=dos_encode_byte(*src++); |
1149 | *dest|=((dest[-1]&1)||(*dest&0x4000))? 0: 0x8000; |
1150 | dest++; |
1151 | } |
1152 | } |
1153 | |
1154 | static unsigned long *ms_putsec(int drive, unsigned long *raw, int cnt) |
1155 | { |
1156 | static struct dos_header hdr={0,0,0,2,0, |
1157 | {78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78}}; |
1158 | int i; |
1159 | static ushort crc[2]={0,0x4e4e}; |
1160 | |
1161 | drive&=3; |
1162 | /* id gap 1 */ |
1163 | /* the MFM word before is always 9254 */ |
1164 | for(i=0;i<6;i++) |
1165 | *raw++=0xaaaaaaaa; |
1166 | /* 3 sync + 1 headermark */ |
1167 | *raw++=0x44894489; |
1168 | *raw++=0x44895554; |
1169 | |
1170 | /* fill in the variable parts of the header */ |
1171 | hdr.track=unit[drive].track/unit[drive].type->heads; |
1172 | hdr.side=unit[drive].track%unit[drive].type->heads; |
1173 | hdr.sec=cnt+1; |
1174 | hdr.crc=dos_hdr_crc(&hdr); |
1175 | |
1176 | /* header (without "magic") and id gap 2*/ |
1177 | dos_encode_block((ushort *)raw,(unsigned char *) &hdr.track,28); |
1178 | raw+=14; |
1179 | |
1180 | /*id gap 3 */ |
1181 | for(i=0;i<6;i++) |
1182 | *raw++=0xaaaaaaaa; |
1183 | |
1184 | /* 3 syncs and 1 datamark */ |
1185 | *raw++=0x44894489; |
1186 | *raw++=0x44895545; |
1187 | |
1188 | /* data */ |
1189 | dos_encode_block((ushort *)raw, |
1190 | (unsigned char *)unit[drive].trackbuf+cnt*512,512); |
1191 | raw+=256; |
1192 | |
1193 | /*data crc + jd's special gap (long words :-/) */ |
1194 | crc[0]=dos_data_crc(unit[drive].trackbuf+cnt*512); |
1195 | dos_encode_block((ushort *) raw,(unsigned char *)crc,4); |
1196 | raw+=2; |
1197 | |
1198 | /* data gap */ |
1199 | for(i=0;i<38;i++) |
1200 | *raw++=0x92549254; |
1201 | |
1202 | return raw; /* wrote 652 MFM words */ |
1203 | } |
1204 | |
1205 | static void dos_write(int disk) |
1206 | { |
1207 | int cnt; |
1208 | unsigned long raw = (unsigned long) raw_buf; |
1209 | unsigned long *ptr=(unsigned long *)raw; |
1210 | |
1211 | disk&=3; |
1212 | /* really gap4 + indexgap , but we write it first and round it up */ |
1213 | for (cnt=0;cnt<425;cnt++) |
1214 | *ptr++=0x92549254; |
1215 | |
1216 | /* the following is just guessed */ |
1217 | if (unit[disk].type->sect_mult==2) /* check for HD-Disks */ |
1218 | for(cnt=0;cnt<473;cnt++) |
1219 | *ptr++=0x92549254; |
1220 | |
1221 | /* now the index marks...*/ |
1222 | for (cnt=0;cnt<20;cnt++) |
1223 | *ptr++=0x92549254; |
1224 | for (cnt=0;cnt<6;cnt++) |
1225 | *ptr++=0xaaaaaaaa; |
1226 | *ptr++=0x52245224; |
1227 | *ptr++=0x52245552; |
1228 | for (cnt=0;cnt<20;cnt++) |
1229 | *ptr++=0x92549254; |
1230 | |
1231 | /* sectors */ |
1232 | for(cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++) |
1233 | ptr=ms_putsec(disk,ptr,cnt); |
1234 | |
1235 | *(ushort *)ptr = 0xaaa8; /* MFM word before is always 0x9254 */ |
1236 | } |
1237 | |
1238 | /* |
1239 | * Here comes the high level stuff (i.e. the filesystem interface) |
1240 | * and helper functions. |
1241 | * Normally this should be the only part that has to be adapted to |
1242 | * different kernel versions. |
1243 | */ |
1244 | |
1245 | /* FIXME: this assumes the drive is still spinning - |
1246 | * which is only true if we complete writing a track within three seconds |
1247 | */ |
1248 | static void flush_track_callback(unsigned long nr) |
1249 | { |
1250 | nr&=3; |
1251 | writefromint = 1; |
1252 | if (!try_fdc(nr)) { |
1253 | /* we might block in an interrupt, so try again later */ |
1254 | flush_track_timer[nr].expires = jiffies + 1; |
1255 | add_timer(flush_track_timer + nr); |
1256 | return; |
1257 | } |
1258 | get_fdc(nr); |
1259 | (*unit[nr].dtype->write_fkt)(nr); |
1260 | if (!raw_write(nr)) { |
1261 | printk (KERN_NOTICE "floppy disk write protected\n"); |
1262 | writefromint = 0; |
1263 | writepending = 0; |
1264 | } |
1265 | rel_fdc(); |
1266 | } |
1267 | |
1268 | static int non_int_flush_track (unsigned long nr) |
1269 | { |
1270 | unsigned long flags; |
1271 | |
1272 | nr&=3; |
1273 | writefromint = 0; |
1274 | del_timer(&post_write_timer); |
1275 | get_fdc(nr); |
1276 | if (!fd_motor_on(nr)) { |
1277 | writepending = 0; |
1278 | rel_fdc(); |
1279 | return 0; |
1280 | } |
1281 | local_irq_save(flags); |
1282 | if (writepending != 2) { |
1283 | local_irq_restore(flags); |
1284 | (*unit[nr].dtype->write_fkt)(nr); |
1285 | if (!raw_write(nr)) { |
1286 | printk (KERN_NOTICE "floppy disk write protected " |
1287 | "in write!\n"); |
1288 | writepending = 0; |
1289 | return 0; |
1290 | } |
1291 | wait_event(wait_fd_block, block_flag != 2); |
1292 | } |
1293 | else { |
1294 | local_irq_restore(flags); |
1295 | ms_delay(2); /* 2 ms post_write delay */ |
1296 | post_write(nr); |
1297 | } |
1298 | rel_fdc(); |
1299 | return 1; |
1300 | } |
1301 | |
1302 | static int get_track(int drive, int track) |
1303 | { |
1304 | int error, errcnt; |
1305 | |
1306 | drive&=3; |
1307 | if (unit[drive].track == track) |
1308 | return 0; |
1309 | get_fdc(drive); |
1310 | if (!fd_motor_on(drive)) { |
1311 | rel_fdc(); |
1312 | return -1; |
1313 | } |
1314 | |
1315 | if (unit[drive].dirty == 1) { |
1316 | del_timer (flush_track_timer + drive); |
1317 | non_int_flush_track (drive); |
1318 | } |
1319 | errcnt = 0; |
1320 | while (errcnt < MAX_ERRORS) { |
1321 | if (!fd_seek(drive, track)) |
1322 | return -1; |
1323 | raw_read(drive); |
1324 | error = (*unit[drive].dtype->read_fkt)(drive); |
1325 | if (error == 0) { |
1326 | rel_fdc(); |
1327 | return 0; |
1328 | } |
1329 | /* Read Error Handling: recalibrate and try again */ |
1330 | unit[drive].track = -1; |
1331 | errcnt++; |
1332 | } |
1333 | rel_fdc(); |
1334 | return -1; |
1335 | } |
1336 | |
1337 | /* |
1338 | * Round-robin between our available drives, doing one request from each |
1339 | */ |
1340 | static struct request *set_next_request(void) |
1341 | { |
1342 | struct request_queue *q; |
1343 | int cnt = FD_MAX_UNITS; |
1344 | struct request *rq = NULL; |
1345 | |
1346 | /* Find next queue we can dispatch from */ |
1347 | fdc_queue = fdc_queue + 1; |
1348 | if (fdc_queue == FD_MAX_UNITS) |
1349 | fdc_queue = 0; |
1350 | |
1351 | for(cnt = FD_MAX_UNITS; cnt > 0; cnt--) { |
1352 | |
1353 | if (unit[fdc_queue].type->code == FD_NODRIVE) { |
1354 | if (++fdc_queue == FD_MAX_UNITS) |
1355 | fdc_queue = 0; |
1356 | continue; |
1357 | } |
1358 | |
1359 | q = unit[fdc_queue].gendisk->queue; |
1360 | if (q) { |
1361 | rq = blk_fetch_request(q); |
1362 | if (rq) |
1363 | break; |
1364 | } |
1365 | |
1366 | if (++fdc_queue == FD_MAX_UNITS) |
1367 | fdc_queue = 0; |
1368 | } |
1369 | |
1370 | return rq; |
1371 | } |
1372 | |
1373 | static void redo_fd_request(void) |
1374 | { |
1375 | struct request *rq; |
1376 | unsigned int cnt, block, track, sector; |
1377 | int drive; |
1378 | struct amiga_floppy_struct *floppy; |
1379 | char *data; |
1380 | unsigned long flags; |
1381 | int err; |
1382 | |
1383 | next_req: |
1384 | rq = set_next_request(); |
1385 | if (!rq) { |
1386 | /* Nothing left to do */ |
1387 | return; |
1388 | } |
1389 | |
1390 | floppy = rq->rq_disk->private_data; |
1391 | drive = floppy - unit; |
1392 | |
1393 | next_segment: |
1394 | /* Here someone could investigate to be more efficient */ |
1395 | for (cnt = 0, err = 0; cnt < blk_rq_cur_sectors(rq); cnt++) { |
1396 | #ifdef DEBUG |
1397 | printk("fd: sector %ld + %d requested for %s\n", |
1398 | blk_rq_pos(rq), cnt, |
1399 | (rq_data_dir(rq) == READ) ? "read" : "write"); |
1400 | #endif |
1401 | block = blk_rq_pos(rq) + cnt; |
1402 | if ((int)block > floppy->blocks) { |
1403 | err = -EIO; |
1404 | break; |
1405 | } |
1406 | |
1407 | track = block / (floppy->dtype->sects * floppy->type->sect_mult); |
1408 | sector = block % (floppy->dtype->sects * floppy->type->sect_mult); |
1409 | data = rq->buffer + 512 * cnt; |
1410 | #ifdef DEBUG |
1411 | printk("access to track %d, sector %d, with buffer at " |
1412 | "0x%08lx\n", track, sector, data); |
1413 | #endif |
1414 | |
1415 | if (get_track(drive, track) == -1) { |
1416 | err = -EIO; |
1417 | break; |
1418 | } |
1419 | |
1420 | if (rq_data_dir(rq) == READ) { |
1421 | memcpy(data, floppy->trackbuf + sector * 512, 512); |
1422 | } else { |
1423 | memcpy(floppy->trackbuf + sector * 512, data, 512); |
1424 | |
1425 | /* keep the drive spinning while writes are scheduled */ |
1426 | if (!fd_motor_on(drive)) { |
1427 | err = -EIO; |
1428 | break; |
1429 | } |
1430 | /* |
1431 | * setup a callback to write the track buffer |
1432 | * after a short (1 tick) delay. |
1433 | */ |
1434 | local_irq_save(flags); |
1435 | |
1436 | floppy->dirty = 1; |
1437 | /* reset the timer */ |
1438 | mod_timer (flush_track_timer + drive, jiffies + 1); |
1439 | local_irq_restore(flags); |
1440 | } |
1441 | } |
1442 | |
1443 | if (__blk_end_request_cur(rq, err)) |
1444 | goto next_segment; |
1445 | goto next_req; |
1446 | } |
1447 | |
1448 | static void do_fd_request(struct request_queue * q) |
1449 | { |
1450 | redo_fd_request(); |
1451 | } |
1452 | |
1453 | static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1454 | { |
1455 | int drive = MINOR(bdev->bd_dev) & 3; |
1456 | |
1457 | geo->heads = unit[drive].type->heads; |
1458 | geo->sectors = unit[drive].dtype->sects * unit[drive].type->sect_mult; |
1459 | geo->cylinders = unit[drive].type->tracks; |
1460 | return 0; |
1461 | } |
1462 | |
1463 | static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, |
1464 | unsigned int cmd, unsigned long param) |
1465 | { |
1466 | struct amiga_floppy_struct *p = bdev->bd_disk->private_data; |
1467 | int drive = p - unit; |
1468 | static struct floppy_struct getprm; |
1469 | void __user *argp = (void __user *)param; |
1470 | |
1471 | switch(cmd){ |
1472 | case FDFMTBEG: |
1473 | get_fdc(drive); |
1474 | if (fd_ref[drive] > 1) { |
1475 | rel_fdc(); |
1476 | return -EBUSY; |
1477 | } |
1478 | fsync_bdev(bdev); |
1479 | if (fd_motor_on(drive) == 0) { |
1480 | rel_fdc(); |
1481 | return -ENODEV; |
1482 | } |
1483 | if (fd_calibrate(drive) == 0) { |
1484 | rel_fdc(); |
1485 | return -ENXIO; |
1486 | } |
1487 | floppy_off(drive); |
1488 | rel_fdc(); |
1489 | break; |
1490 | case FDFMTTRK: |
1491 | if (param < p->type->tracks * p->type->heads) |
1492 | { |
1493 | get_fdc(drive); |
1494 | if (fd_seek(drive,param) != 0){ |
1495 | memset(p->trackbuf, FD_FILL_BYTE, |
1496 | p->dtype->sects * p->type->sect_mult * 512); |
1497 | non_int_flush_track(drive); |
1498 | } |
1499 | floppy_off(drive); |
1500 | rel_fdc(); |
1501 | } |
1502 | else |
1503 | return -EINVAL; |
1504 | break; |
1505 | case FDFMTEND: |
1506 | floppy_off(drive); |
1507 | invalidate_bdev(bdev); |
1508 | break; |
1509 | case FDGETPRM: |
1510 | memset((void *)&getprm, 0, sizeof (getprm)); |
1511 | getprm.track=p->type->tracks; |
1512 | getprm.head=p->type->heads; |
1513 | getprm.sect=p->dtype->sects * p->type->sect_mult; |
1514 | getprm.size=p->blocks; |
1515 | if (copy_to_user(argp, &getprm, sizeof(struct floppy_struct))) |
1516 | return -EFAULT; |
1517 | break; |
1518 | case FDSETPRM: |
1519 | case FDDEFPRM: |
1520 | return -EINVAL; |
1521 | case FDFLUSH: /* unconditionally, even if not needed */ |
1522 | del_timer (flush_track_timer + drive); |
1523 | non_int_flush_track(drive); |
1524 | break; |
1525 | #ifdef RAW_IOCTL |
1526 | case IOCTL_RAW_TRACK: |
1527 | if (copy_to_user(argp, raw_buf, p->type->read_size)) |
1528 | return -EFAULT; |
1529 | else |
1530 | return p->type->read_size; |
1531 | #endif |
1532 | default: |
1533 | printk(KERN_DEBUG "fd_ioctl: unknown cmd %d for drive %d.", |
1534 | cmd, drive); |
1535 | return -ENOSYS; |
1536 | } |
1537 | return 0; |
1538 | } |
1539 | |
1540 | static int fd_ioctl(struct block_device *bdev, fmode_t mode, |
1541 | unsigned int cmd, unsigned long param) |
1542 | { |
1543 | int ret; |
1544 | |
1545 | mutex_lock(&amiflop_mutex); |
1546 | ret = fd_locked_ioctl(bdev, mode, cmd, param); |
1547 | mutex_unlock(&amiflop_mutex); |
1548 | |
1549 | return ret; |
1550 | } |
1551 | |
1552 | static void fd_probe(int dev) |
1553 | { |
1554 | unsigned long code; |
1555 | int type; |
1556 | int drive; |
1557 | |
1558 | drive = dev & 3; |
1559 | code = fd_get_drive_id(drive); |
1560 | |
1561 | /* get drive type */ |
1562 | for (type = 0; type < num_dr_types; type++) |
1563 | if (drive_types[type].code == code) |
1564 | break; |
1565 | |
1566 | if (type >= num_dr_types) { |
1567 | printk(KERN_WARNING "fd_probe: unsupported drive type " |
1568 | "%08lx found\n", code); |
1569 | unit[drive].type = &drive_types[num_dr_types-1]; /* FD_NODRIVE */ |
1570 | return; |
1571 | } |
1572 | |
1573 | unit[drive].type = drive_types + type; |
1574 | unit[drive].track = -1; |
1575 | |
1576 | unit[drive].disk = -1; |
1577 | unit[drive].motor = 0; |
1578 | unit[drive].busy = 0; |
1579 | unit[drive].status = -1; |
1580 | } |
1581 | |
1582 | /* |
1583 | * floppy_open check for aliasing (/dev/fd0 can be the same as |
1584 | * /dev/PS0 etc), and disallows simultaneous access to the same |
1585 | * drive with different device numbers. |
1586 | */ |
1587 | static int floppy_open(struct block_device *bdev, fmode_t mode) |
1588 | { |
1589 | int drive = MINOR(bdev->bd_dev) & 3; |
1590 | int system = (MINOR(bdev->bd_dev) & 4) >> 2; |
1591 | int old_dev; |
1592 | unsigned long flags; |
1593 | |
1594 | mutex_lock(&amiflop_mutex); |
1595 | old_dev = fd_device[drive]; |
1596 | |
1597 | if (fd_ref[drive] && old_dev != system) { |
1598 | mutex_unlock(&amiflop_mutex); |
1599 | return -EBUSY; |
1600 | } |
1601 | |
1602 | if (mode & (FMODE_READ|FMODE_WRITE)) { |
1603 | check_disk_change(bdev); |
1604 | if (mode & FMODE_WRITE) { |
1605 | int wrprot; |
1606 | |
1607 | get_fdc(drive); |
1608 | fd_select (drive); |
1609 | wrprot = !(ciaa.pra & DSKPROT); |
1610 | fd_deselect (drive); |
1611 | rel_fdc(); |
1612 | |
1613 | if (wrprot) { |
1614 | mutex_unlock(&amiflop_mutex); |
1615 | return -EROFS; |
1616 | } |
1617 | } |
1618 | } |
1619 | |
1620 | local_irq_save(flags); |
1621 | fd_ref[drive]++; |
1622 | fd_device[drive] = system; |
1623 | local_irq_restore(flags); |
1624 | |
1625 | unit[drive].dtype=&data_types[system]; |
1626 | unit[drive].blocks=unit[drive].type->heads*unit[drive].type->tracks* |
1627 | data_types[system].sects*unit[drive].type->sect_mult; |
1628 | set_capacity(unit[drive].gendisk, unit[drive].blocks); |
1629 | |
1630 | printk(KERN_INFO "fd%d: accessing %s-disk with %s-layout\n",drive, |
1631 | unit[drive].type->name, data_types[system].name); |
1632 | |
1633 | mutex_unlock(&amiflop_mutex); |
1634 | return 0; |
1635 | } |
1636 | |
1637 | static int floppy_release(struct gendisk *disk, fmode_t mode) |
1638 | { |
1639 | struct amiga_floppy_struct *p = disk->private_data; |
1640 | int drive = p - unit; |
1641 | |
1642 | mutex_lock(&amiflop_mutex); |
1643 | if (unit[drive].dirty == 1) { |
1644 | del_timer (flush_track_timer + drive); |
1645 | non_int_flush_track (drive); |
1646 | } |
1647 | |
1648 | if (!fd_ref[drive]--) { |
1649 | printk(KERN_CRIT "floppy_release with fd_ref == 0"); |
1650 | fd_ref[drive] = 0; |
1651 | } |
1652 | #ifdef MODULE |
1653 | /* the mod_use counter is handled this way */ |
1654 | floppy_off (drive | 0x40000000); |
1655 | #endif |
1656 | mutex_unlock(&amiflop_mutex); |
1657 | return 0; |
1658 | } |
1659 | |
1660 | /* |
1661 | * check_events is never called from an interrupt, so we can relax a bit |
1662 | * here, sleep etc. Note that floppy-on tries to set current_DOR to point |
1663 | * to the desired drive, but it will probably not survive the sleep if |
1664 | * several floppies are used at the same time: thus the loop. |
1665 | */ |
1666 | static unsigned amiga_check_events(struct gendisk *disk, unsigned int clearing) |
1667 | { |
1668 | struct amiga_floppy_struct *p = disk->private_data; |
1669 | int drive = p - unit; |
1670 | int changed; |
1671 | static int first_time = 1; |
1672 | |
1673 | if (first_time) |
1674 | changed = first_time--; |
1675 | else { |
1676 | get_fdc(drive); |
1677 | fd_select (drive); |
1678 | changed = !(ciaa.pra & DSKCHANGE); |
1679 | fd_deselect (drive); |
1680 | rel_fdc(); |
1681 | } |
1682 | |
1683 | if (changed) { |
1684 | fd_probe(drive); |
1685 | p->track = -1; |
1686 | p->dirty = 0; |
1687 | writepending = 0; /* if this was true before, too bad! */ |
1688 | writefromint = 0; |
1689 | return DISK_EVENT_MEDIA_CHANGE; |
1690 | } |
1691 | return 0; |
1692 | } |
1693 | |
1694 | static const struct block_device_operations floppy_fops = { |
1695 | .owner = THIS_MODULE, |
1696 | .open = floppy_open, |
1697 | .release = floppy_release, |
1698 | .ioctl = fd_ioctl, |
1699 | .getgeo = fd_getgeo, |
1700 | .check_events = amiga_check_events, |
1701 | }; |
1702 | |
1703 | static int __init fd_probe_drives(void) |
1704 | { |
1705 | int drive,drives,nomem; |
1706 | |
1707 | printk(KERN_INFO "FD: probing units\nfound "); |
1708 | drives=0; |
1709 | nomem=0; |
1710 | for(drive=0;drive<FD_MAX_UNITS;drive++) { |
1711 | struct gendisk *disk; |
1712 | fd_probe(drive); |
1713 | if (unit[drive].type->code == FD_NODRIVE) |
1714 | continue; |
1715 | disk = alloc_disk(1); |
1716 | if (!disk) { |
1717 | unit[drive].type->code = FD_NODRIVE; |
1718 | continue; |
1719 | } |
1720 | unit[drive].gendisk = disk; |
1721 | |
1722 | disk->queue = blk_init_queue(do_fd_request, &amiflop_lock); |
1723 | if (!disk->queue) { |
1724 | unit[drive].type->code = FD_NODRIVE; |
1725 | continue; |
1726 | } |
1727 | |
1728 | drives++; |
1729 | if ((unit[drive].trackbuf = kmalloc(FLOPPY_MAX_SECTORS * 512, GFP_KERNEL)) == NULL) { |
1730 | printk("no mem for "); |
1731 | unit[drive].type = &drive_types[num_dr_types - 1]; /* FD_NODRIVE */ |
1732 | drives--; |
1733 | nomem = 1; |
1734 | } |
1735 | printk("fd%d ",drive); |
1736 | disk->major = FLOPPY_MAJOR; |
1737 | disk->first_minor = drive; |
1738 | disk->fops = &floppy_fops; |
1739 | sprintf(disk->disk_name, "fd%d", drive); |
1740 | disk->private_data = &unit[drive]; |
1741 | set_capacity(disk, 880*2); |
1742 | add_disk(disk); |
1743 | } |
1744 | if ((drives > 0) || (nomem == 0)) { |
1745 | if (drives == 0) |
1746 | printk("no drives"); |
1747 | printk("\n"); |
1748 | return drives; |
1749 | } |
1750 | printk("\n"); |
1751 | return -ENOMEM; |
1752 | } |
1753 | |
1754 | static struct kobject *floppy_find(dev_t dev, int *part, void *data) |
1755 | { |
1756 | int drive = *part & 3; |
1757 | if (unit[drive].type->code == FD_NODRIVE) |
1758 | return NULL; |
1759 | *part = 0; |
1760 | return get_disk(unit[drive].gendisk); |
1761 | } |
1762 | |
1763 | static int __init amiga_floppy_probe(struct platform_device *pdev) |
1764 | { |
1765 | int i, ret; |
1766 | |
1767 | if (register_blkdev(FLOPPY_MAJOR,"fd")) |
1768 | return -EBUSY; |
1769 | |
1770 | ret = -ENOMEM; |
1771 | raw_buf = amiga_chip_alloc(RAW_BUF_SIZE, "Floppy"); |
1772 | if (!raw_buf) { |
1773 | printk("fd: cannot get chip mem buffer\n"); |
1774 | goto out_blkdev; |
1775 | } |
1776 | |
1777 | ret = -EBUSY; |
1778 | if (request_irq(IRQ_AMIGA_DSKBLK, fd_block_done, 0, "floppy_dma", NULL)) { |
1779 | printk("fd: cannot get irq for dma\n"); |
1780 | goto out_irq; |
1781 | } |
1782 | |
1783 | if (request_irq(IRQ_AMIGA_CIAA_TB, ms_isr, 0, "floppy_timer", NULL)) { |
1784 | printk("fd: cannot get irq for timer\n"); |
1785 | goto out_irq2; |
1786 | } |
1787 | |
1788 | ret = -ENODEV; |
1789 | if (fd_probe_drives() < 1) /* No usable drives */ |
1790 | goto out_probe; |
1791 | |
1792 | blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE, |
1793 | floppy_find, NULL, NULL); |
1794 | |
1795 | /* initialize variables */ |
1796 | init_timer(&motor_on_timer); |
1797 | motor_on_timer.expires = 0; |
1798 | motor_on_timer.data = 0; |
1799 | motor_on_timer.function = motor_on_callback; |
1800 | for (i = 0; i < FD_MAX_UNITS; i++) { |
1801 | init_timer(&motor_off_timer[i]); |
1802 | motor_off_timer[i].expires = 0; |
1803 | motor_off_timer[i].data = i|0x80000000; |
1804 | motor_off_timer[i].function = fd_motor_off; |
1805 | init_timer(&flush_track_timer[i]); |
1806 | flush_track_timer[i].expires = 0; |
1807 | flush_track_timer[i].data = i; |
1808 | flush_track_timer[i].function = flush_track_callback; |
1809 | |
1810 | unit[i].track = -1; |
1811 | } |
1812 | |
1813 | init_timer(&post_write_timer); |
1814 | post_write_timer.expires = 0; |
1815 | post_write_timer.data = 0; |
1816 | post_write_timer.function = post_write; |
1817 | |
1818 | for (i = 0; i < 128; i++) |
1819 | mfmdecode[i]=255; |
1820 | for (i = 0; i < 16; i++) |
1821 | mfmdecode[mfmencode[i]]=i; |
1822 | |
1823 | /* make sure that disk DMA is enabled */ |
1824 | custom.dmacon = DMAF_SETCLR | DMAF_DISK; |
1825 | |
1826 | /* init ms timer */ |
1827 | ciaa.crb = 8; /* one-shot, stop */ |
1828 | return 0; |
1829 | |
1830 | out_probe: |
1831 | free_irq(IRQ_AMIGA_CIAA_TB, NULL); |
1832 | out_irq2: |
1833 | free_irq(IRQ_AMIGA_DSKBLK, NULL); |
1834 | out_irq: |
1835 | amiga_chip_free(raw_buf); |
1836 | out_blkdev: |
1837 | unregister_blkdev(FLOPPY_MAJOR,"fd"); |
1838 | return ret; |
1839 | } |
1840 | |
1841 | #if 0 /* not safe to unload */ |
1842 | static int __exit amiga_floppy_remove(struct platform_device *pdev) |
1843 | { |
1844 | int i; |
1845 | |
1846 | for( i = 0; i < FD_MAX_UNITS; i++) { |
1847 | if (unit[i].type->code != FD_NODRIVE) { |
1848 | struct request_queue *q = unit[i].gendisk->queue; |
1849 | del_gendisk(unit[i].gendisk); |
1850 | put_disk(unit[i].gendisk); |
1851 | kfree(unit[i].trackbuf); |
1852 | if (q) |
1853 | blk_cleanup_queue(q); |
1854 | } |
1855 | } |
1856 | blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256); |
1857 | free_irq(IRQ_AMIGA_CIAA_TB, NULL); |
1858 | free_irq(IRQ_AMIGA_DSKBLK, NULL); |
1859 | custom.dmacon = DMAF_DISK; /* disable DMA */ |
1860 | amiga_chip_free(raw_buf); |
1861 | unregister_blkdev(FLOPPY_MAJOR, "fd"); |
1862 | } |
1863 | #endif |
1864 | |
1865 | static struct platform_driver amiga_floppy_driver = { |
1866 | .driver = { |
1867 | .name = "amiga-floppy", |
1868 | .owner = THIS_MODULE, |
1869 | }, |
1870 | }; |
1871 | |
1872 | static int __init amiga_floppy_init(void) |
1873 | { |
1874 | return platform_driver_probe(&amiga_floppy_driver, amiga_floppy_probe); |
1875 | } |
1876 | |
1877 | module_init(amiga_floppy_init); |
1878 | |
1879 | #ifndef MODULE |
1880 | static int __init amiga_floppy_setup (char *str) |
1881 | { |
1882 | int n; |
1883 | if (!MACH_IS_AMIGA) |
1884 | return 0; |
1885 | if (!get_option(&str, &n)) |
1886 | return 0; |
1887 | printk (KERN_INFO "amiflop: Setting default df0 to %x\n", n); |
1888 | fd_def_df0 = n; |
1889 | return 1; |
1890 | } |
1891 | |
1892 | __setup("floppy=", amiga_floppy_setup); |
1893 | #endif |
1894 | |
1895 | MODULE_ALIAS("platform:amiga-floppy"); |
1896 |
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