Commit | Line | Data |
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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/amiga/amiflop.c | |
4 | * | |
5 | * Copyright (C) 1993 Greg Harp | |
6 | * Portions of this driver are based on code contributed by Brad Pepers | |
7 | * | |
8 | * revised 28.5.95 by Joerg Dorchain | |
9 | * - now no bugs(?) any more for both HD & DD | |
10 | * - added support for 40 Track 5.25" drives, 80-track hopefully behaves | |
11 | * like 3.5" dd (no way to test - are there any 5.25" drives out there | |
12 | * that work on an A4000?) | |
13 | * - wrote formatting routine (maybe dirty, but works) | |
14 | * | |
15 | * june/july 1995 added ms-dos support by Joerg Dorchain | |
16 | * (portions based on messydos.device and various contributors) | |
17 | * - currently only 9 and 18 sector disks | |
18 | * | |
19 | * - fixed a bug with the internal trackbuffer when using multiple | |
20 | * disks the same time | |
21 | * - made formatting a bit safer | |
22 | * - added command line and machine based default for "silent" df0 | |
23 | * | |
24 | * december 1995 adapted for 1.2.13pl4 by Joerg Dorchain | |
25 | * - works but I think it's inefficient. (look in redo_fd_request) | |
26 | * But the changes were very efficient. (only three and a half lines) | |
27 | * | |
28 | * january 1996 added special ioctl for tracking down read/write problems | |
29 | * - usage ioctl(d, RAW_TRACK, ptr); the raw track buffer (MFM-encoded data | |
30 | * is copied to area. (area should be large enough since no checking is | |
31 | * done - 30K is currently sufficient). return the actual size of the | |
32 | * trackbuffer | |
33 | * - replaced udelays() by a timer (CIAA timer B) for the waits | |
34 | * needed for the disk mechanic. | |
35 | * | |
36 | * february 1996 fixed error recovery and multiple disk access | |
37 | * - both got broken the first time I tampered with the driver :-( | |
38 | * - still not safe, but better than before | |
39 | * | |
40 | * revised Marts 3rd, 1996 by Jes Sorensen for use in the 1.3.28 kernel. | |
41 | * - Minor changes to accept the kdev_t. | |
42 | * - Replaced some more udelays with ms_delays. Udelay is just a loop, | |
43 | * and so the delay will be different depending on the given | |
44 | * processor :-( | |
45 | * - The driver could use a major cleanup because of the new | |
46 | * major/minor handling that came with kdev_t. It seems to work for | |
47 | * the time being, but I can't guarantee that it will stay like | |
48 | * that when we start using 16 (24?) bit minors. | |
49 | * | |
50 | * restructured jan 1997 by Joerg Dorchain | |
51 | * - Fixed Bug accessing multiple disks | |
52 | * - some code cleanup | |
53 | * - added trackbuffer for each drive to speed things up | |
54 | * - fixed some race conditions (who finds the next may send it to me ;-) | |
55 | */ | |
56 | ||
57 | #include <linux/module.h> | |
5a0e3ad6 | 58 | #include <linux/slab.h> |
1da177e4 LT |
59 | |
60 | #include <linux/fd.h> | |
61 | #include <linux/hdreg.h> | |
62 | #include <linux/delay.h> | |
63 | #include <linux/init.h> | |
b81e0c23 | 64 | #include <linux/major.h> |
2a48fc0a | 65 | #include <linux/mutex.h> |
ff01bb48 | 66 | #include <linux/fs.h> |
c87228f1 | 67 | #include <linux/blk-mq.h> |
b5dc7840 | 68 | #include <linux/interrupt.h> |
92183b34 | 69 | #include <linux/platform_device.h> |
1da177e4 LT |
70 | |
71 | #include <asm/setup.h> | |
7c0f6ba6 | 72 | #include <linux/uaccess.h> |
1da177e4 LT |
73 | #include <asm/amigahw.h> |
74 | #include <asm/amigaints.h> | |
75 | #include <asm/irq.h> | |
76 | ||
77 | #undef DEBUG /* print _LOTS_ of infos */ | |
78 | ||
79 | #define RAW_IOCTL | |
80 | #ifdef RAW_IOCTL | |
81 | #define IOCTL_RAW_TRACK 0x5254524B /* 'RTRK' */ | |
82 | #endif | |
83 | ||
84 | /* | |
85 | * Defines | |
86 | */ | |
87 | ||
c87228f1 OS |
88 | /* |
89 | * CIAAPRA bits (read only) | |
90 | */ | |
91 | ||
92 | #define DSKRDY (0x1<<5) /* disk ready when low */ | |
93 | #define DSKTRACK0 (0x1<<4) /* head at track zero when low */ | |
94 | #define DSKPROT (0x1<<3) /* disk protected when low */ | |
95 | #define DSKCHANGE (0x1<<2) /* low when disk removed */ | |
96 | ||
97 | /* | |
98 | * CIAAPRB bits (read/write) | |
99 | */ | |
100 | ||
101 | #define DSKMOTOR (0x1<<7) /* motor on when low */ | |
102 | #define DSKSEL3 (0x1<<6) /* select drive 3 when low */ | |
103 | #define DSKSEL2 (0x1<<5) /* select drive 2 when low */ | |
104 | #define DSKSEL1 (0x1<<4) /* select drive 1 when low */ | |
105 | #define DSKSEL0 (0x1<<3) /* select drive 0 when low */ | |
106 | #define DSKSIDE (0x1<<2) /* side selection: 0 = upper, 1 = lower */ | |
107 | #define DSKDIREC (0x1<<1) /* step direction: 0=in, 1=out (to trk 0) */ | |
108 | #define DSKSTEP (0x1) /* pulse low to step head 1 track */ | |
109 | ||
110 | /* | |
111 | * DSKBYTR bits (read only) | |
112 | */ | |
113 | ||
114 | #define DSKBYT (1<<15) /* register contains valid byte when set */ | |
115 | #define DMAON (1<<14) /* disk DMA enabled */ | |
116 | #define DISKWRITE (1<<13) /* disk write bit in DSKLEN enabled */ | |
117 | #define WORDEQUAL (1<<12) /* DSKSYNC register match when true */ | |
118 | /* bits 7-0 are data */ | |
119 | ||
120 | /* | |
121 | * ADKCON/ADKCONR bits | |
122 | */ | |
123 | ||
124 | #ifndef SETCLR | |
125 | #define ADK_SETCLR (1<<15) /* control bit */ | |
126 | #endif | |
127 | #define ADK_PRECOMP1 (1<<14) /* precompensation selection */ | |
128 | #define ADK_PRECOMP0 (1<<13) /* 00=none, 01=140ns, 10=280ns, 11=500ns */ | |
129 | #define ADK_MFMPREC (1<<12) /* 0=GCR precomp., 1=MFM precomp. */ | |
130 | #define ADK_WORDSYNC (1<<10) /* enable DSKSYNC auto DMA */ | |
131 | #define ADK_MSBSYNC (1<<9) /* when 1, enable sync on MSbit (for GCR) */ | |
132 | #define ADK_FAST (1<<8) /* bit cell: 0=2us (GCR), 1=1us (MFM) */ | |
133 | ||
134 | /* | |
135 | * DSKLEN bits | |
136 | */ | |
137 | ||
138 | #define DSKLEN_DMAEN (1<<15) | |
139 | #define DSKLEN_WRITE (1<<14) | |
140 | ||
141 | /* | |
142 | * INTENA/INTREQ bits | |
143 | */ | |
144 | ||
145 | #define DSKINDEX (0x1<<4) /* DSKINDEX bit */ | |
146 | ||
147 | /* | |
148 | * Misc | |
149 | */ | |
150 | ||
151 | #define MFM_SYNC 0x4489 /* standard MFM sync value */ | |
152 | ||
153 | /* Values for FD_COMMAND */ | |
154 | #define FD_RECALIBRATE 0x07 /* move to track 0 */ | |
155 | #define FD_SEEK 0x0F /* seek track */ | |
156 | #define FD_READ 0xE6 /* read with MT, MFM, SKip deleted */ | |
157 | #define FD_WRITE 0xC5 /* write with MT, MFM */ | |
158 | #define FD_SENSEI 0x08 /* Sense Interrupt Status */ | |
159 | #define FD_SPECIFY 0x03 /* specify HUT etc */ | |
160 | #define FD_FORMAT 0x4D /* format one track */ | |
161 | #define FD_VERSION 0x10 /* get version code */ | |
162 | #define FD_CONFIGURE 0x13 /* configure FIFO operation */ | |
163 | #define FD_PERPENDICULAR 0x12 /* perpendicular r/w mode */ | |
164 | ||
165 | #define FD_MAX_UNITS 4 /* Max. Number of drives */ | |
166 | #define FLOPPY_MAX_SECTORS 22 /* Max. Number of sectors per track */ | |
167 | ||
168 | struct fd_data_type { | |
169 | char *name; /* description of data type */ | |
170 | int sects; /* sectors per track */ | |
171 | int (*read_fkt)(int); /* read whole track */ | |
172 | void (*write_fkt)(int); /* write whole track */ | |
173 | }; | |
174 | ||
175 | struct fd_drive_type { | |
176 | unsigned long code; /* code returned from drive */ | |
177 | char *name; /* description of drive */ | |
178 | unsigned int tracks; /* number of tracks */ | |
179 | unsigned int heads; /* number of heads */ | |
180 | unsigned int read_size; /* raw read size for one track */ | |
181 | unsigned int write_size; /* raw write size for one track */ | |
182 | unsigned int sect_mult; /* sectors and gap multiplier (HD = 2) */ | |
183 | unsigned int precomp1; /* start track for precomp 1 */ | |
184 | unsigned int precomp2; /* start track for precomp 2 */ | |
185 | unsigned int step_delay; /* time (in ms) for delay after step */ | |
186 | unsigned int settle_time; /* time to settle after dir change */ | |
187 | unsigned int side_time; /* time needed to change sides */ | |
188 | }; | |
189 | ||
190 | struct amiga_floppy_struct { | |
191 | struct fd_drive_type *type; /* type of floppy for this unit */ | |
192 | struct fd_data_type *dtype; /* type of floppy for this unit */ | |
193 | int track; /* current track (-1 == unknown) */ | |
194 | unsigned char *trackbuf; /* current track (kmaloc()'d */ | |
195 | ||
196 | int blocks; /* total # blocks on disk */ | |
197 | ||
198 | int changed; /* true when not known */ | |
199 | int disk; /* disk in drive (-1 == unknown) */ | |
200 | int motor; /* true when motor is at speed */ | |
201 | int busy; /* true when drive is active */ | |
202 | int dirty; /* true when trackbuf is not on disk */ | |
203 | int status; /* current error code for unit */ | |
0033a9b4 | 204 | struct gendisk *gendisk[2]; |
21b07f35 | 205 | struct blk_mq_tag_set tag_set; |
c87228f1 OS |
206 | }; |
207 | ||
1da177e4 LT |
208 | /* |
209 | * Error codes | |
210 | */ | |
211 | #define FD_OK 0 /* operation succeeded */ | |
212 | #define FD_ERROR -1 /* general error (seek, read, write, etc) */ | |
213 | #define FD_NOUNIT 1 /* unit does not exist */ | |
214 | #define FD_UNITBUSY 2 /* unit already active */ | |
215 | #define FD_NOTACTIVE 3 /* unit is not active */ | |
216 | #define FD_NOTREADY 4 /* unit is not ready (motor not on/no disk) */ | |
217 | ||
218 | #define MFM_NOSYNC 1 | |
219 | #define MFM_HEADER 2 | |
220 | #define MFM_DATA 3 | |
221 | #define MFM_TRACK 4 | |
222 | ||
223 | /* | |
224 | * Floppy ID values | |
225 | */ | |
226 | #define FD_NODRIVE 0x00000000 /* response when no unit is present */ | |
227 | #define FD_DD_3 0xffffffff /* double-density 3.5" (880K) drive */ | |
228 | #define FD_HD_3 0x55555555 /* high-density 3.5" (1760K) drive */ | |
229 | #define FD_DD_5 0xaaaaaaaa /* double-density 5.25" (440K) drive */ | |
230 | ||
2a48fc0a | 231 | static DEFINE_MUTEX(amiflop_mutex); |
1da177e4 LT |
232 | static unsigned long int fd_def_df0 = FD_DD_3; /* default for df0 if it doesn't identify */ |
233 | ||
234 | module_param(fd_def_df0, ulong, 0); | |
235 | MODULE_LICENSE("GPL"); | |
236 | ||
1da177e4 LT |
237 | /* |
238 | * Macros | |
239 | */ | |
240 | #define MOTOR_ON (ciab.prb &= ~DSKMOTOR) | |
241 | #define MOTOR_OFF (ciab.prb |= DSKMOTOR) | |
242 | #define SELECT(mask) (ciab.prb &= ~mask) | |
243 | #define DESELECT(mask) (ciab.prb |= mask) | |
244 | #define SELMASK(drive) (1 << (3 + (drive & 3))) | |
245 | ||
246 | static struct fd_drive_type drive_types[] = { | |
247 | /* code name tr he rdsz wrsz sm pc1 pc2 sd st st*/ | |
248 | /* warning: times are now in milliseconds (ms) */ | |
249 | { FD_DD_3, "DD 3.5", 80, 2, 14716, 13630, 1, 80,161, 3, 18, 1}, | |
250 | { FD_HD_3, "HD 3.5", 80, 2, 28344, 27258, 2, 80,161, 3, 18, 1}, | |
251 | { FD_DD_5, "DD 5.25", 40, 2, 14716, 13630, 1, 40, 81, 6, 30, 2}, | |
252 | { FD_NODRIVE, "No Drive", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} | |
253 | }; | |
945f390f | 254 | static int num_dr_types = ARRAY_SIZE(drive_types); |
1da177e4 LT |
255 | |
256 | static int amiga_read(int), dos_read(int); | |
257 | static void amiga_write(int), dos_write(int); | |
258 | static struct fd_data_type data_types[] = { | |
259 | { "Amiga", 11 , amiga_read, amiga_write}, | |
260 | { "MS-Dos", 9, dos_read, dos_write} | |
261 | }; | |
262 | ||
263 | /* current info on each unit */ | |
264 | static struct amiga_floppy_struct unit[FD_MAX_UNITS]; | |
265 | ||
266 | static struct timer_list flush_track_timer[FD_MAX_UNITS]; | |
267 | static struct timer_list post_write_timer; | |
cbb9d178 | 268 | static unsigned long post_write_timer_drive; |
1da177e4 LT |
269 | static struct timer_list motor_on_timer; |
270 | static struct timer_list motor_off_timer[FD_MAX_UNITS]; | |
271 | static int on_attempts; | |
272 | ||
273 | /* Synchronization of FDC access */ | |
274 | /* request loop (trackbuffer) */ | |
275 | static volatile int fdc_busy = -1; | |
276 | static volatile int fdc_nested; | |
277 | static DECLARE_WAIT_QUEUE_HEAD(fdc_wait); | |
278 | ||
6d0be946 | 279 | static DECLARE_COMPLETION(motor_on_completion); |
1da177e4 LT |
280 | |
281 | static volatile int selected = -1; /* currently selected drive */ | |
282 | ||
283 | static int writepending; | |
284 | static int writefromint; | |
285 | static char *raw_buf; | |
286 | ||
287 | static DEFINE_SPINLOCK(amiflop_lock); | |
288 | ||
289 | #define RAW_BUF_SIZE 30000 /* size of raw disk data */ | |
290 | ||
291 | /* | |
292 | * These are global variables, as that's the easiest way to give | |
293 | * information to interrupts. They are the data used for the current | |
294 | * request. | |
295 | */ | |
296 | static volatile char block_flag; | |
297 | static DECLARE_WAIT_QUEUE_HEAD(wait_fd_block); | |
298 | ||
299 | /* MS-Dos MFM Coding tables (should go quick and easy) */ | |
300 | static unsigned char mfmencode[16]={ | |
301 | 0x2a, 0x29, 0x24, 0x25, 0x12, 0x11, 0x14, 0x15, | |
302 | 0x4a, 0x49, 0x44, 0x45, 0x52, 0x51, 0x54, 0x55 | |
303 | }; | |
304 | static unsigned char mfmdecode[128]; | |
305 | ||
306 | /* floppy internal millisecond timer stuff */ | |
6d0be946 | 307 | static DECLARE_COMPLETION(ms_wait_completion); |
1da177e4 LT |
308 | #define MS_TICKS ((amiga_eclock+50)/1000) |
309 | ||
310 | /* | |
311 | * Note that MAX_ERRORS=X doesn't imply that we retry every bad read | |
312 | * max X times - some types of errors increase the errorcount by 2 or | |
313 | * even 3, so we might actually retry only X/2 times before giving up. | |
314 | */ | |
315 | #define MAX_ERRORS 12 | |
316 | ||
b4290a23 AV |
317 | #define custom amiga_custom |
318 | ||
1da177e4 LT |
319 | /* Prevent "aliased" accesses. */ |
320 | static int fd_ref[4] = { 0,0,0,0 }; | |
321 | static int fd_device[4] = { 0, 0, 0, 0 }; | |
322 | ||
323 | /* | |
324 | * Here come the actual hardware access and helper functions. | |
325 | * They are not reentrant and single threaded because all drives | |
326 | * share the same hardware and the same trackbuffer. | |
327 | */ | |
328 | ||
329 | /* Milliseconds timer */ | |
330 | ||
7d12e780 | 331 | static irqreturn_t ms_isr(int irq, void *dummy) |
1da177e4 | 332 | { |
6d0be946 | 333 | complete(&ms_wait_completion); |
1da177e4 LT |
334 | return IRQ_HANDLED; |
335 | } | |
336 | ||
337 | /* all waits are queued up | |
338 | A more generic routine would do a schedule a la timer.device */ | |
339 | static void ms_delay(int ms) | |
340 | { | |
1da177e4 | 341 | int ticks; |
6d0be946 AB |
342 | static DEFINE_MUTEX(mutex); |
343 | ||
1da177e4 | 344 | if (ms > 0) { |
6d0be946 | 345 | mutex_lock(&mutex); |
1da177e4 LT |
346 | ticks = MS_TICKS*ms-1; |
347 | ciaa.tblo=ticks%256; | |
348 | ciaa.tbhi=ticks/256; | |
349 | ciaa.crb=0x19; /*count eclock, force load, one-shoot, start */ | |
6d0be946 AB |
350 | wait_for_completion(&ms_wait_completion); |
351 | mutex_unlock(&mutex); | |
1da177e4 LT |
352 | } |
353 | } | |
354 | ||
355 | /* Hardware semaphore */ | |
356 | ||
357 | /* returns true when we would get the semaphore */ | |
358 | static inline int try_fdc(int drive) | |
359 | { | |
360 | drive &= 3; | |
361 | return ((fdc_busy < 0) || (fdc_busy == drive)); | |
362 | } | |
363 | ||
364 | static void get_fdc(int drive) | |
365 | { | |
366 | unsigned long flags; | |
367 | ||
368 | drive &= 3; | |
369 | #ifdef DEBUG | |
370 | printk("get_fdc: drive %d fdc_busy %d fdc_nested %d\n",drive,fdc_busy,fdc_nested); | |
371 | #endif | |
372 | local_irq_save(flags); | |
6d0be946 | 373 | wait_event(fdc_wait, try_fdc(drive)); |
1da177e4 LT |
374 | fdc_busy = drive; |
375 | fdc_nested++; | |
376 | local_irq_restore(flags); | |
377 | } | |
378 | ||
379 | static inline void rel_fdc(void) | |
380 | { | |
381 | #ifdef DEBUG | |
382 | if (fdc_nested == 0) | |
383 | printk("fd: unmatched rel_fdc\n"); | |
384 | printk("rel_fdc: fdc_busy %d fdc_nested %d\n",fdc_busy,fdc_nested); | |
385 | #endif | |
386 | fdc_nested--; | |
387 | if (fdc_nested == 0) { | |
388 | fdc_busy = -1; | |
389 | wake_up(&fdc_wait); | |
390 | } | |
391 | } | |
392 | ||
393 | static void fd_select (int drive) | |
394 | { | |
395 | unsigned char prb = ~0; | |
396 | ||
397 | drive&=3; | |
398 | #ifdef DEBUG | |
399 | printk("selecting %d\n",drive); | |
400 | #endif | |
401 | if (drive == selected) | |
402 | return; | |
403 | get_fdc(drive); | |
404 | selected = drive; | |
405 | ||
406 | if (unit[drive].track % 2 != 0) | |
407 | prb &= ~DSKSIDE; | |
408 | if (unit[drive].motor == 1) | |
409 | prb &= ~DSKMOTOR; | |
410 | ciab.prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3)); | |
411 | ciab.prb = prb; | |
412 | prb &= ~SELMASK(drive); | |
413 | ciab.prb = prb; | |
414 | rel_fdc(); | |
415 | } | |
416 | ||
417 | static void fd_deselect (int drive) | |
418 | { | |
419 | unsigned char prb; | |
420 | unsigned long flags; | |
421 | ||
422 | drive&=3; | |
423 | #ifdef DEBUG | |
424 | printk("deselecting %d\n",drive); | |
425 | #endif | |
426 | if (drive != selected) { | |
427 | printk(KERN_WARNING "Deselecting drive %d while %d was selected!\n",drive,selected); | |
428 | return; | |
429 | } | |
430 | ||
431 | get_fdc(drive); | |
432 | local_irq_save(flags); | |
433 | ||
434 | selected = -1; | |
435 | ||
436 | prb = ciab.prb; | |
437 | prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3)); | |
438 | ciab.prb = prb; | |
439 | ||
440 | local_irq_restore (flags); | |
441 | rel_fdc(); | |
442 | ||
443 | } | |
444 | ||
cbb9d178 | 445 | static void motor_on_callback(struct timer_list *unused) |
1da177e4 LT |
446 | { |
447 | if (!(ciaa.pra & DSKRDY) || --on_attempts == 0) { | |
6d0be946 | 448 | complete_all(&motor_on_completion); |
1da177e4 LT |
449 | } else { |
450 | motor_on_timer.expires = jiffies + HZ/10; | |
451 | add_timer(&motor_on_timer); | |
452 | } | |
453 | } | |
454 | ||
455 | static int fd_motor_on(int nr) | |
456 | { | |
457 | nr &= 3; | |
458 | ||
459 | del_timer(motor_off_timer + nr); | |
460 | ||
461 | if (!unit[nr].motor) { | |
462 | unit[nr].motor = 1; | |
463 | fd_select(nr); | |
464 | ||
16735d02 | 465 | reinit_completion(&motor_on_completion); |
1da177e4 LT |
466 | mod_timer(&motor_on_timer, jiffies + HZ/2); |
467 | ||
468 | on_attempts = 10; | |
6d0be946 | 469 | wait_for_completion(&motor_on_completion); |
1da177e4 LT |
470 | fd_deselect(nr); |
471 | } | |
472 | ||
473 | if (on_attempts == 0) { | |
474 | on_attempts = -1; | |
475 | #if 0 | |
476 | printk (KERN_ERR "motor_on failed, turning motor off\n"); | |
cbb9d178 | 477 | fd_motor_off (motor_off_timer + nr); |
1da177e4 LT |
478 | return 0; |
479 | #else | |
480 | printk (KERN_WARNING "DSKRDY not set after 1.5 seconds - assuming drive is spinning notwithstanding\n"); | |
481 | #endif | |
482 | } | |
483 | ||
484 | return 1; | |
485 | } | |
486 | ||
cbb9d178 | 487 | static void fd_motor_off(struct timer_list *timer) |
1da177e4 | 488 | { |
cbb9d178 KC |
489 | unsigned long drive = ((unsigned long)timer - |
490 | (unsigned long)&motor_off_timer[0]) / | |
491 | sizeof(motor_off_timer[0]); | |
1da177e4 | 492 | |
1da177e4 | 493 | drive&=3; |
cbb9d178 | 494 | if (!try_fdc(drive)) { |
1da177e4 | 495 | /* We would be blocked in an interrupt, so try again later */ |
cbb9d178 KC |
496 | timer->expires = jiffies + 1; |
497 | add_timer(timer); | |
1da177e4 LT |
498 | return; |
499 | } | |
500 | unit[drive].motor = 0; | |
501 | fd_select(drive); | |
502 | udelay (1); | |
503 | fd_deselect(drive); | |
504 | } | |
505 | ||
506 | static void floppy_off (unsigned int nr) | |
507 | { | |
508 | int drive; | |
509 | ||
510 | drive = nr & 3; | |
1da177e4 LT |
511 | mod_timer(motor_off_timer + drive, jiffies + 3*HZ); |
512 | } | |
513 | ||
514 | static int fd_calibrate(int drive) | |
515 | { | |
516 | unsigned char prb; | |
517 | int n; | |
518 | ||
519 | drive &= 3; | |
520 | get_fdc(drive); | |
521 | if (!fd_motor_on (drive)) | |
522 | return 0; | |
523 | fd_select (drive); | |
524 | prb = ciab.prb; | |
525 | prb |= DSKSIDE; | |
526 | prb &= ~DSKDIREC; | |
527 | ciab.prb = prb; | |
528 | for (n = unit[drive].type->tracks/2; n != 0; --n) { | |
529 | if (ciaa.pra & DSKTRACK0) | |
530 | break; | |
531 | prb &= ~DSKSTEP; | |
532 | ciab.prb = prb; | |
533 | prb |= DSKSTEP; | |
534 | udelay (2); | |
535 | ciab.prb = prb; | |
536 | ms_delay(unit[drive].type->step_delay); | |
537 | } | |
538 | ms_delay (unit[drive].type->settle_time); | |
539 | prb |= DSKDIREC; | |
540 | n = unit[drive].type->tracks + 20; | |
541 | for (;;) { | |
542 | prb &= ~DSKSTEP; | |
543 | ciab.prb = prb; | |
544 | prb |= DSKSTEP; | |
545 | udelay (2); | |
546 | ciab.prb = prb; | |
547 | ms_delay(unit[drive].type->step_delay + 1); | |
548 | if ((ciaa.pra & DSKTRACK0) == 0) | |
549 | break; | |
550 | if (--n == 0) { | |
551 | printk (KERN_ERR "fd%d: calibrate failed, turning motor off\n", drive); | |
cbb9d178 | 552 | fd_motor_off (motor_off_timer + drive); |
1da177e4 LT |
553 | unit[drive].track = -1; |
554 | rel_fdc(); | |
555 | return 0; | |
556 | } | |
557 | } | |
558 | unit[drive].track = 0; | |
559 | ms_delay(unit[drive].type->settle_time); | |
560 | ||
561 | rel_fdc(); | |
562 | fd_deselect(drive); | |
563 | return 1; | |
564 | } | |
565 | ||
566 | static int fd_seek(int drive, int track) | |
567 | { | |
568 | unsigned char prb; | |
569 | int cnt; | |
570 | ||
571 | #ifdef DEBUG | |
572 | printk("seeking drive %d to track %d\n",drive,track); | |
573 | #endif | |
574 | drive &= 3; | |
575 | get_fdc(drive); | |
576 | if (unit[drive].track == track) { | |
577 | rel_fdc(); | |
578 | return 1; | |
579 | } | |
580 | if (!fd_motor_on(drive)) { | |
581 | rel_fdc(); | |
582 | return 0; | |
583 | } | |
584 | if (unit[drive].track < 0 && !fd_calibrate(drive)) { | |
585 | rel_fdc(); | |
586 | return 0; | |
587 | } | |
588 | ||
589 | fd_select (drive); | |
590 | cnt = unit[drive].track/2 - track/2; | |
591 | prb = ciab.prb; | |
592 | prb |= DSKSIDE | DSKDIREC; | |
593 | if (track % 2 != 0) | |
594 | prb &= ~DSKSIDE; | |
595 | if (cnt < 0) { | |
596 | cnt = - cnt; | |
597 | prb &= ~DSKDIREC; | |
598 | } | |
599 | ciab.prb = prb; | |
600 | if (track % 2 != unit[drive].track % 2) | |
601 | ms_delay (unit[drive].type->side_time); | |
602 | unit[drive].track = track; | |
603 | if (cnt == 0) { | |
604 | rel_fdc(); | |
605 | fd_deselect(drive); | |
606 | return 1; | |
607 | } | |
608 | do { | |
609 | prb &= ~DSKSTEP; | |
610 | ciab.prb = prb; | |
611 | prb |= DSKSTEP; | |
612 | udelay (1); | |
613 | ciab.prb = prb; | |
614 | ms_delay (unit[drive].type->step_delay); | |
615 | } while (--cnt != 0); | |
616 | ms_delay (unit[drive].type->settle_time); | |
617 | ||
618 | rel_fdc(); | |
619 | fd_deselect(drive); | |
620 | return 1; | |
621 | } | |
622 | ||
623 | static unsigned long fd_get_drive_id(int drive) | |
624 | { | |
625 | int i; | |
626 | ulong id = 0; | |
627 | ||
628 | drive&=3; | |
629 | get_fdc(drive); | |
630 | /* set up for ID */ | |
631 | MOTOR_ON; | |
632 | udelay(2); | |
633 | SELECT(SELMASK(drive)); | |
634 | udelay(2); | |
635 | DESELECT(SELMASK(drive)); | |
636 | udelay(2); | |
637 | MOTOR_OFF; | |
638 | udelay(2); | |
639 | SELECT(SELMASK(drive)); | |
640 | udelay(2); | |
641 | DESELECT(SELMASK(drive)); | |
642 | udelay(2); | |
643 | ||
644 | /* loop and read disk ID */ | |
645 | for (i=0; i<32; i++) { | |
646 | SELECT(SELMASK(drive)); | |
647 | udelay(2); | |
648 | ||
649 | /* read and store value of DSKRDY */ | |
650 | id <<= 1; | |
651 | id |= (ciaa.pra & DSKRDY) ? 0 : 1; /* cia regs are low-active! */ | |
652 | ||
653 | DESELECT(SELMASK(drive)); | |
654 | } | |
655 | ||
656 | rel_fdc(); | |
657 | ||
658 | /* | |
659 | * RB: At least A500/A2000's df0: don't identify themselves. | |
660 | * As every (real) Amiga has at least a 3.5" DD drive as df0: | |
661 | * we default to that if df0: doesn't identify as a certain | |
662 | * type. | |
663 | */ | |
664 | if(drive == 0 && id == FD_NODRIVE) | |
665 | { | |
666 | id = fd_def_df0; | |
667 | printk(KERN_NOTICE "fd: drive 0 didn't identify, setting default %08lx\n", (ulong)fd_def_df0); | |
668 | } | |
669 | /* return the ID value */ | |
670 | return (id); | |
671 | } | |
672 | ||
7d12e780 | 673 | static irqreturn_t fd_block_done(int irq, void *dummy) |
1da177e4 LT |
674 | { |
675 | if (block_flag) | |
676 | custom.dsklen = 0x4000; | |
677 | ||
678 | if (block_flag == 2) { /* writing */ | |
679 | writepending = 2; | |
680 | post_write_timer.expires = jiffies + 1; /* at least 2 ms */ | |
cbb9d178 | 681 | post_write_timer_drive = selected; |
1da177e4 LT |
682 | add_timer(&post_write_timer); |
683 | } | |
684 | else { /* reading */ | |
685 | block_flag = 0; | |
686 | wake_up (&wait_fd_block); | |
687 | } | |
688 | return IRQ_HANDLED; | |
689 | } | |
690 | ||
691 | static void raw_read(int drive) | |
692 | { | |
693 | drive&=3; | |
694 | get_fdc(drive); | |
6d0be946 | 695 | wait_event(wait_fd_block, !block_flag); |
1da177e4 LT |
696 | fd_select(drive); |
697 | /* setup adkcon bits correctly */ | |
698 | custom.adkcon = ADK_MSBSYNC; | |
699 | custom.adkcon = ADK_SETCLR|ADK_WORDSYNC|ADK_FAST; | |
700 | ||
701 | custom.dsksync = MFM_SYNC; | |
702 | ||
703 | custom.dsklen = 0; | |
704 | custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf); | |
705 | custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN; | |
706 | custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN; | |
707 | ||
708 | block_flag = 1; | |
709 | ||
6d0be946 | 710 | wait_event(wait_fd_block, !block_flag); |
1da177e4 LT |
711 | |
712 | custom.dsklen = 0; | |
713 | fd_deselect(drive); | |
714 | rel_fdc(); | |
715 | } | |
716 | ||
717 | static int raw_write(int drive) | |
718 | { | |
719 | ushort adk; | |
720 | ||
721 | drive&=3; | |
722 | get_fdc(drive); /* corresponds to rel_fdc() in post_write() */ | |
723 | if ((ciaa.pra & DSKPROT) == 0) { | |
724 | rel_fdc(); | |
725 | return 0; | |
726 | } | |
6d0be946 | 727 | wait_event(wait_fd_block, !block_flag); |
1da177e4 LT |
728 | fd_select(drive); |
729 | /* clear adkcon bits */ | |
730 | custom.adkcon = ADK_PRECOMP1|ADK_PRECOMP0|ADK_WORDSYNC|ADK_MSBSYNC; | |
731 | /* set appropriate adkcon bits */ | |
732 | adk = ADK_SETCLR|ADK_FAST; | |
733 | if ((ulong)unit[drive].track >= unit[drive].type->precomp2) | |
734 | adk |= ADK_PRECOMP1; | |
735 | else if ((ulong)unit[drive].track >= unit[drive].type->precomp1) | |
736 | adk |= ADK_PRECOMP0; | |
737 | custom.adkcon = adk; | |
738 | ||
739 | custom.dsklen = DSKLEN_WRITE; | |
740 | custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf); | |
741 | custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE; | |
742 | custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE; | |
743 | ||
744 | block_flag = 2; | |
745 | return 1; | |
746 | } | |
747 | ||
748 | /* | |
749 | * to be called at least 2ms after the write has finished but before any | |
750 | * other access to the hardware. | |
751 | */ | |
752 | static void post_write (unsigned long drive) | |
753 | { | |
754 | #ifdef DEBUG | |
755 | printk("post_write for drive %ld\n",drive); | |
756 | #endif | |
757 | drive &= 3; | |
758 | custom.dsklen = 0; | |
759 | block_flag = 0; | |
760 | writepending = 0; | |
761 | writefromint = 0; | |
762 | unit[drive].dirty = 0; | |
763 | wake_up(&wait_fd_block); | |
764 | fd_deselect(drive); | |
765 | rel_fdc(); /* corresponds to get_fdc() in raw_write */ | |
766 | } | |
767 | ||
cbb9d178 KC |
768 | static void post_write_callback(struct timer_list *timer) |
769 | { | |
770 | post_write(post_write_timer_drive); | |
771 | } | |
1da177e4 LT |
772 | |
773 | /* | |
774 | * The following functions are to convert the block contents into raw data | |
775 | * written to disk and vice versa. | |
776 | * (Add other formats here ;-)) | |
777 | */ | |
778 | ||
779 | static unsigned long scan_sync(unsigned long raw, unsigned long end) | |
780 | { | |
781 | ushort *ptr = (ushort *)raw, *endp = (ushort *)end; | |
782 | ||
783 | while (ptr < endp && *ptr++ != 0x4489) | |
784 | ; | |
785 | if (ptr < endp) { | |
786 | while (*ptr == 0x4489 && ptr < endp) | |
787 | ptr++; | |
788 | return (ulong)ptr; | |
789 | } | |
790 | return 0; | |
791 | } | |
792 | ||
793 | static inline unsigned long checksum(unsigned long *addr, int len) | |
794 | { | |
795 | unsigned long csum = 0; | |
796 | ||
797 | len /= sizeof(*addr); | |
798 | while (len-- > 0) | |
799 | csum ^= *addr++; | |
800 | csum = ((csum>>1) & 0x55555555) ^ (csum & 0x55555555); | |
801 | ||
802 | return csum; | |
803 | } | |
804 | ||
805 | static unsigned long decode (unsigned long *data, unsigned long *raw, | |
806 | int len) | |
807 | { | |
808 | ulong *odd, *even; | |
809 | ||
810 | /* convert length from bytes to longwords */ | |
811 | len >>= 2; | |
812 | odd = raw; | |
813 | even = odd + len; | |
814 | ||
815 | /* prepare return pointer */ | |
816 | raw += len * 2; | |
817 | ||
818 | do { | |
819 | *data++ = ((*odd++ & 0x55555555) << 1) | (*even++ & 0x55555555); | |
820 | } while (--len != 0); | |
821 | ||
822 | return (ulong)raw; | |
823 | } | |
824 | ||
825 | struct header { | |
826 | unsigned char magic; | |
827 | unsigned char track; | |
828 | unsigned char sect; | |
829 | unsigned char ord; | |
830 | unsigned char labels[16]; | |
831 | unsigned long hdrchk; | |
832 | unsigned long datachk; | |
833 | }; | |
834 | ||
835 | static int amiga_read(int drive) | |
836 | { | |
837 | unsigned long raw; | |
838 | unsigned long end; | |
839 | int scnt; | |
840 | unsigned long csum; | |
841 | struct header hdr; | |
842 | ||
843 | drive&=3; | |
844 | raw = (long) raw_buf; | |
845 | end = raw + unit[drive].type->read_size; | |
846 | ||
847 | for (scnt = 0;scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) { | |
848 | if (!(raw = scan_sync(raw, end))) { | |
849 | printk (KERN_INFO "can't find sync for sector %d\n", scnt); | |
850 | return MFM_NOSYNC; | |
851 | } | |
852 | ||
853 | raw = decode ((ulong *)&hdr.magic, (ulong *)raw, 4); | |
854 | raw = decode ((ulong *)&hdr.labels, (ulong *)raw, 16); | |
855 | raw = decode ((ulong *)&hdr.hdrchk, (ulong *)raw, 4); | |
856 | raw = decode ((ulong *)&hdr.datachk, (ulong *)raw, 4); | |
857 | csum = checksum((ulong *)&hdr, | |
858 | (char *)&hdr.hdrchk-(char *)&hdr); | |
859 | ||
860 | #ifdef DEBUG | |
861 | printk ("(%x,%d,%d,%d) (%lx,%lx,%lx,%lx) %lx %lx\n", | |
862 | hdr.magic, hdr.track, hdr.sect, hdr.ord, | |
863 | *(ulong *)&hdr.labels[0], *(ulong *)&hdr.labels[4], | |
864 | *(ulong *)&hdr.labels[8], *(ulong *)&hdr.labels[12], | |
865 | hdr.hdrchk, hdr.datachk); | |
866 | #endif | |
867 | ||
868 | if (hdr.hdrchk != csum) { | |
869 | printk(KERN_INFO "MFM_HEADER: %08lx,%08lx\n", hdr.hdrchk, csum); | |
870 | return MFM_HEADER; | |
871 | } | |
872 | ||
873 | /* verify track */ | |
874 | if (hdr.track != unit[drive].track) { | |
875 | printk(KERN_INFO "MFM_TRACK: %d, %d\n", hdr.track, unit[drive].track); | |
876 | return MFM_TRACK; | |
877 | } | |
878 | ||
879 | raw = decode ((ulong *)(unit[drive].trackbuf + hdr.sect*512), | |
880 | (ulong *)raw, 512); | |
881 | csum = checksum((ulong *)(unit[drive].trackbuf + hdr.sect*512), 512); | |
882 | ||
883 | if (hdr.datachk != csum) { | |
884 | printk(KERN_INFO "MFM_DATA: (%x:%d:%d:%d) sc=%d %lx, %lx\n", | |
885 | hdr.magic, hdr.track, hdr.sect, hdr.ord, scnt, | |
886 | hdr.datachk, csum); | |
887 | printk (KERN_INFO "data=(%lx,%lx,%lx,%lx)\n", | |
888 | ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[0], | |
889 | ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[1], | |
890 | ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[2], | |
891 | ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[3]); | |
892 | return MFM_DATA; | |
893 | } | |
894 | } | |
895 | ||
896 | return 0; | |
897 | } | |
898 | ||
899 | static void encode(unsigned long data, unsigned long *dest) | |
900 | { | |
901 | unsigned long data2; | |
902 | ||
903 | data &= 0x55555555; | |
904 | data2 = data ^ 0x55555555; | |
905 | data |= ((data2 >> 1) | 0x80000000) & (data2 << 1); | |
906 | ||
907 | if (*(dest - 1) & 0x00000001) | |
908 | data &= 0x7FFFFFFF; | |
909 | ||
910 | *dest = data; | |
911 | } | |
912 | ||
913 | static void encode_block(unsigned long *dest, unsigned long *src, int len) | |
914 | { | |
915 | int cnt, to_cnt = 0; | |
916 | unsigned long data; | |
917 | ||
918 | /* odd bits */ | |
919 | for (cnt = 0; cnt < len / 4; cnt++) { | |
920 | data = src[cnt] >> 1; | |
921 | encode(data, dest + to_cnt++); | |
922 | } | |
923 | ||
924 | /* even bits */ | |
925 | for (cnt = 0; cnt < len / 4; cnt++) { | |
926 | data = src[cnt]; | |
927 | encode(data, dest + to_cnt++); | |
928 | } | |
929 | } | |
930 | ||
931 | static unsigned long *putsec(int disk, unsigned long *raw, int cnt) | |
932 | { | |
933 | struct header hdr; | |
934 | int i; | |
935 | ||
936 | disk&=3; | |
937 | *raw = (raw[-1]&1) ? 0x2AAAAAAA : 0xAAAAAAAA; | |
938 | raw++; | |
939 | *raw++ = 0x44894489; | |
940 | ||
941 | hdr.magic = 0xFF; | |
942 | hdr.track = unit[disk].track; | |
943 | hdr.sect = cnt; | |
944 | hdr.ord = unit[disk].dtype->sects * unit[disk].type->sect_mult - cnt; | |
945 | for (i = 0; i < 16; i++) | |
946 | hdr.labels[i] = 0; | |
947 | hdr.hdrchk = checksum((ulong *)&hdr, | |
948 | (char *)&hdr.hdrchk-(char *)&hdr); | |
949 | hdr.datachk = checksum((ulong *)(unit[disk].trackbuf+cnt*512), 512); | |
950 | ||
951 | encode_block(raw, (ulong *)&hdr.magic, 4); | |
952 | raw += 2; | |
953 | encode_block(raw, (ulong *)&hdr.labels, 16); | |
954 | raw += 8; | |
955 | encode_block(raw, (ulong *)&hdr.hdrchk, 4); | |
956 | raw += 2; | |
957 | encode_block(raw, (ulong *)&hdr.datachk, 4); | |
958 | raw += 2; | |
959 | encode_block(raw, (ulong *)(unit[disk].trackbuf+cnt*512), 512); | |
960 | raw += 256; | |
961 | ||
962 | return raw; | |
963 | } | |
964 | ||
965 | static void amiga_write(int disk) | |
966 | { | |
967 | unsigned int cnt; | |
968 | unsigned long *ptr = (unsigned long *)raw_buf; | |
969 | ||
970 | disk&=3; | |
971 | /* gap space */ | |
972 | for (cnt = 0; cnt < 415 * unit[disk].type->sect_mult; cnt++) | |
973 | *ptr++ = 0xaaaaaaaa; | |
974 | ||
975 | /* sectors */ | |
976 | for (cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++) | |
977 | ptr = putsec (disk, ptr, cnt); | |
978 | *(ushort *)ptr = (ptr[-1]&1) ? 0x2AA8 : 0xAAA8; | |
979 | } | |
980 | ||
981 | ||
982 | struct dos_header { | |
983 | unsigned char track, /* 0-80 */ | |
984 | side, /* 0-1 */ | |
985 | sec, /* 0-...*/ | |
986 | len_desc;/* 2 */ | |
987 | unsigned short crc; /* on 68000 we got an alignment problem, | |
988 | but this compiler solves it by adding silently | |
989 | adding a pad byte so data won't fit | |
990 | and this took about 3h to discover.... */ | |
991 | unsigned char gap1[22]; /* for longword-alignedness (0x4e) */ | |
992 | }; | |
993 | ||
994 | /* crc routines are borrowed from the messydos-handler */ | |
995 | ||
996 | /* excerpt from the messydos-device | |
997 | ; The CRC is computed not only over the actual data, but including | |
998 | ; the SYNC mark (3 * $a1) and the 'ID/DATA - Address Mark' ($fe/$fb). | |
999 | ; As we don't read or encode these fields into our buffers, we have to | |
1000 | ; preload the registers containing the CRC with the values they would have | |
1001 | ; after stepping over these fields. | |
1002 | ; | |
1003 | ; How CRCs "really" work: | |
1004 | ; | |
1005 | ; First, you should regard a bitstring as a series of coefficients of | |
1006 | ; polynomials. We calculate with these polynomials in modulo-2 | |
1007 | ; arithmetic, in which both add and subtract are done the same as | |
1008 | ; exclusive-or. Now, we modify our data (a very long polynomial) in | |
1009 | ; such a way that it becomes divisible by the CCITT-standard 16-bit | |
1010 | ; 16 12 5 | |
1011 | ; polynomial: x + x + x + 1, represented by $11021. The easiest | |
1012 | ; way to do this would be to multiply (using proper arithmetic) our | |
1013 | ; datablock with $11021. So we have: | |
1014 | ; data * $11021 = | |
1015 | ; data * ($10000 + $1021) = | |
1016 | ; data * $10000 + data * $1021 | |
1017 | ; The left part of this is simple: Just add two 0 bytes. But then | |
1018 | ; the right part (data $1021) remains difficult and even could have | |
1019 | ; a carry into the left part. The solution is to use a modified | |
1020 | ; multiplication, which has a result that is not correct, but with | |
1021 | ; a difference of any multiple of $11021. We then only need to keep | |
1022 | ; the 16 least significant bits of the result. | |
1023 | ; | |
1024 | ; The following algorithm does this for us: | |
1025 | ; | |
1026 | ; unsigned char *data, c, crclo, crchi; | |
1027 | ; while (not done) { | |
1028 | ; c = *data++ + crchi; | |
1029 | ; crchi = (@ c) >> 8 + crclo; | |
1030 | ; crclo = @ c; | |
1031 | ; } | |
1032 | ; | |
1033 | ; Remember, + is done with EOR, the @ operator is in two tables (high | |
1034 | ; and low byte separately), which is calculated as | |
1035 | ; | |
1036 | ; $1021 * (c & $F0) | |
1037 | ; xor $1021 * (c & $0F) | |
1038 | ; xor $1021 * (c >> 4) (* is regular multiplication) | |
1039 | ; | |
1040 | ; | |
1041 | ; Anyway, the end result is the same as the remainder of the division of | |
1042 | ; the data by $11021. I am afraid I need to study theory a bit more... | |
1043 | ||
1044 | ||
1045 | my only works was to code this from manx to C.... | |
1046 | ||
1047 | */ | |
1048 | ||
1049 | static ushort dos_crc(void * data_a3, int data_d0, int data_d1, int data_d3) | |
1050 | { | |
1051 | static unsigned char CRCTable1[] = { | |
1052 | 0x00,0x10,0x20,0x30,0x40,0x50,0x60,0x70,0x81,0x91,0xa1,0xb1,0xc1,0xd1,0xe1,0xf1, | |
1053 | 0x12,0x02,0x32,0x22,0x52,0x42,0x72,0x62,0x93,0x83,0xb3,0xa3,0xd3,0xc3,0xf3,0xe3, | |
1054 | 0x24,0x34,0x04,0x14,0x64,0x74,0x44,0x54,0xa5,0xb5,0x85,0x95,0xe5,0xf5,0xc5,0xd5, | |
1055 | 0x36,0x26,0x16,0x06,0x76,0x66,0x56,0x46,0xb7,0xa7,0x97,0x87,0xf7,0xe7,0xd7,0xc7, | |
1056 | 0x48,0x58,0x68,0x78,0x08,0x18,0x28,0x38,0xc9,0xd9,0xe9,0xf9,0x89,0x99,0xa9,0xb9, | |
1057 | 0x5a,0x4a,0x7a,0x6a,0x1a,0x0a,0x3a,0x2a,0xdb,0xcb,0xfb,0xeb,0x9b,0x8b,0xbb,0xab, | |
1058 | 0x6c,0x7c,0x4c,0x5c,0x2c,0x3c,0x0c,0x1c,0xed,0xfd,0xcd,0xdd,0xad,0xbd,0x8d,0x9d, | |
1059 | 0x7e,0x6e,0x5e,0x4e,0x3e,0x2e,0x1e,0x0e,0xff,0xef,0xdf,0xcf,0xbf,0xaf,0x9f,0x8f, | |
1060 | 0x91,0x81,0xb1,0xa1,0xd1,0xc1,0xf1,0xe1,0x10,0x00,0x30,0x20,0x50,0x40,0x70,0x60, | |
1061 | 0x83,0x93,0xa3,0xb3,0xc3,0xd3,0xe3,0xf3,0x02,0x12,0x22,0x32,0x42,0x52,0x62,0x72, | |
1062 | 0xb5,0xa5,0x95,0x85,0xf5,0xe5,0xd5,0xc5,0x34,0x24,0x14,0x04,0x74,0x64,0x54,0x44, | |
1063 | 0xa7,0xb7,0x87,0x97,0xe7,0xf7,0xc7,0xd7,0x26,0x36,0x06,0x16,0x66,0x76,0x46,0x56, | |
1064 | 0xd9,0xc9,0xf9,0xe9,0x99,0x89,0xb9,0xa9,0x58,0x48,0x78,0x68,0x18,0x08,0x38,0x28, | |
1065 | 0xcb,0xdb,0xeb,0xfb,0x8b,0x9b,0xab,0xbb,0x4a,0x5a,0x6a,0x7a,0x0a,0x1a,0x2a,0x3a, | |
1066 | 0xfd,0xed,0xdd,0xcd,0xbd,0xad,0x9d,0x8d,0x7c,0x6c,0x5c,0x4c,0x3c,0x2c,0x1c,0x0c, | |
1067 | 0xef,0xff,0xcf,0xdf,0xaf,0xbf,0x8f,0x9f,0x6e,0x7e,0x4e,0x5e,0x2e,0x3e,0x0e,0x1e | |
1068 | }; | |
1069 | ||
1070 | static unsigned char CRCTable2[] = { | |
1071 | 0x00,0x21,0x42,0x63,0x84,0xa5,0xc6,0xe7,0x08,0x29,0x4a,0x6b,0x8c,0xad,0xce,0xef, | |
1072 | 0x31,0x10,0x73,0x52,0xb5,0x94,0xf7,0xd6,0x39,0x18,0x7b,0x5a,0xbd,0x9c,0xff,0xde, | |
1073 | 0x62,0x43,0x20,0x01,0xe6,0xc7,0xa4,0x85,0x6a,0x4b,0x28,0x09,0xee,0xcf,0xac,0x8d, | |
1074 | 0x53,0x72,0x11,0x30,0xd7,0xf6,0x95,0xb4,0x5b,0x7a,0x19,0x38,0xdf,0xfe,0x9d,0xbc, | |
1075 | 0xc4,0xe5,0x86,0xa7,0x40,0x61,0x02,0x23,0xcc,0xed,0x8e,0xaf,0x48,0x69,0x0a,0x2b, | |
1076 | 0xf5,0xd4,0xb7,0x96,0x71,0x50,0x33,0x12,0xfd,0xdc,0xbf,0x9e,0x79,0x58,0x3b,0x1a, | |
1077 | 0xa6,0x87,0xe4,0xc5,0x22,0x03,0x60,0x41,0xae,0x8f,0xec,0xcd,0x2a,0x0b,0x68,0x49, | |
1078 | 0x97,0xb6,0xd5,0xf4,0x13,0x32,0x51,0x70,0x9f,0xbe,0xdd,0xfc,0x1b,0x3a,0x59,0x78, | |
1079 | 0x88,0xa9,0xca,0xeb,0x0c,0x2d,0x4e,0x6f,0x80,0xa1,0xc2,0xe3,0x04,0x25,0x46,0x67, | |
1080 | 0xb9,0x98,0xfb,0xda,0x3d,0x1c,0x7f,0x5e,0xb1,0x90,0xf3,0xd2,0x35,0x14,0x77,0x56, | |
1081 | 0xea,0xcb,0xa8,0x89,0x6e,0x4f,0x2c,0x0d,0xe2,0xc3,0xa0,0x81,0x66,0x47,0x24,0x05, | |
1082 | 0xdb,0xfa,0x99,0xb8,0x5f,0x7e,0x1d,0x3c,0xd3,0xf2,0x91,0xb0,0x57,0x76,0x15,0x34, | |
1083 | 0x4c,0x6d,0x0e,0x2f,0xc8,0xe9,0x8a,0xab,0x44,0x65,0x06,0x27,0xc0,0xe1,0x82,0xa3, | |
1084 | 0x7d,0x5c,0x3f,0x1e,0xf9,0xd8,0xbb,0x9a,0x75,0x54,0x37,0x16,0xf1,0xd0,0xb3,0x92, | |
1085 | 0x2e,0x0f,0x6c,0x4d,0xaa,0x8b,0xe8,0xc9,0x26,0x07,0x64,0x45,0xa2,0x83,0xe0,0xc1, | |
1086 | 0x1f,0x3e,0x5d,0x7c,0x9b,0xba,0xd9,0xf8,0x17,0x36,0x55,0x74,0x93,0xb2,0xd1,0xf0 | |
1087 | }; | |
1088 | ||
1089 | /* look at the asm-code - what looks in C a bit strange is almost as good as handmade */ | |
1090 | register int i; | |
1091 | register unsigned char *CRCT1, *CRCT2, *data, c, crch, crcl; | |
1092 | ||
1093 | CRCT1=CRCTable1; | |
1094 | CRCT2=CRCTable2; | |
1095 | data=data_a3; | |
1096 | crcl=data_d1; | |
1097 | crch=data_d0; | |
1098 | for (i=data_d3; i>=0; i--) { | |
1099 | c = (*data++) ^ crch; | |
1100 | crch = CRCT1[c] ^ crcl; | |
1101 | crcl = CRCT2[c]; | |
1102 | } | |
1103 | return (crch<<8)|crcl; | |
1104 | } | |
1105 | ||
1106 | static inline ushort dos_hdr_crc (struct dos_header *hdr) | |
1107 | { | |
1108 | return dos_crc(&(hdr->track), 0xb2, 0x30, 3); /* precomputed magic */ | |
1109 | } | |
1110 | ||
1111 | static inline ushort dos_data_crc(unsigned char *data) | |
1112 | { | |
1113 | return dos_crc(data, 0xe2, 0x95 ,511); /* precomputed magic */ | |
1114 | } | |
1115 | ||
1116 | static inline unsigned char dos_decode_byte(ushort word) | |
1117 | { | |
1118 | register ushort w2; | |
1119 | register unsigned char byte; | |
1120 | register unsigned char *dec = mfmdecode; | |
1121 | ||
1122 | w2=word; | |
1123 | w2>>=8; | |
1124 | w2&=127; | |
1125 | byte = dec[w2]; | |
1126 | byte <<= 4; | |
1127 | w2 = word & 127; | |
1128 | byte |= dec[w2]; | |
1129 | return byte; | |
1130 | } | |
1131 | ||
1132 | static unsigned long dos_decode(unsigned char *data, unsigned short *raw, int len) | |
1133 | { | |
1134 | int i; | |
1135 | ||
1136 | for (i = 0; i < len; i++) | |
1137 | *data++=dos_decode_byte(*raw++); | |
1138 | return ((ulong)raw); | |
1139 | } | |
1140 | ||
1141 | #ifdef DEBUG | |
1142 | static void dbg(unsigned long ptr) | |
1143 | { | |
1144 | printk("raw data @%08lx: %08lx, %08lx ,%08lx, %08lx\n", ptr, | |
1145 | ((ulong *)ptr)[0], ((ulong *)ptr)[1], | |
1146 | ((ulong *)ptr)[2], ((ulong *)ptr)[3]); | |
1147 | } | |
1148 | #endif | |
1149 | ||
1150 | static int dos_read(int drive) | |
1151 | { | |
1152 | unsigned long end; | |
1153 | unsigned long raw; | |
1154 | int scnt; | |
1155 | unsigned short crc,data_crc[2]; | |
1156 | struct dos_header hdr; | |
1157 | ||
1158 | drive&=3; | |
1159 | raw = (long) raw_buf; | |
1160 | end = raw + unit[drive].type->read_size; | |
1161 | ||
1162 | for (scnt=0; scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) { | |
1163 | do { /* search for the right sync of each sec-hdr */ | |
1164 | if (!(raw = scan_sync (raw, end))) { | |
1165 | printk(KERN_INFO "dos_read: no hdr sync on " | |
1166 | "track %d, unit %d for sector %d\n", | |
1167 | unit[drive].track,drive,scnt); | |
1168 | return MFM_NOSYNC; | |
1169 | } | |
1170 | #ifdef DEBUG | |
1171 | dbg(raw); | |
1172 | #endif | |
1173 | } while (*((ushort *)raw)!=0x5554); /* loop usually only once done */ | |
1174 | raw+=2; /* skip over headermark */ | |
1175 | raw = dos_decode((unsigned char *)&hdr,(ushort *) raw,8); | |
1176 | crc = dos_hdr_crc(&hdr); | |
1177 | ||
1178 | #ifdef DEBUG | |
1179 | printk("(%3d,%d,%2d,%d) %x\n", hdr.track, hdr.side, | |
1180 | hdr.sec, hdr.len_desc, hdr.crc); | |
1181 | #endif | |
1182 | ||
1183 | if (crc != hdr.crc) { | |
1184 | printk(KERN_INFO "dos_read: MFM_HEADER %04x,%04x\n", | |
1185 | hdr.crc, crc); | |
1186 | return MFM_HEADER; | |
1187 | } | |
1188 | if (hdr.track != unit[drive].track/unit[drive].type->heads) { | |
1189 | printk(KERN_INFO "dos_read: MFM_TRACK %d, %d\n", | |
1190 | hdr.track, | |
1191 | unit[drive].track/unit[drive].type->heads); | |
1192 | return MFM_TRACK; | |
1193 | } | |
1194 | ||
1195 | if (hdr.side != unit[drive].track%unit[drive].type->heads) { | |
1196 | printk(KERN_INFO "dos_read: MFM_SIDE %d, %d\n", | |
1197 | hdr.side, | |
1198 | unit[drive].track%unit[drive].type->heads); | |
1199 | return MFM_TRACK; | |
1200 | } | |
1201 | ||
1202 | if (hdr.len_desc != 2) { | |
1203 | printk(KERN_INFO "dos_read: unknown sector len " | |
1204 | "descriptor %d\n", hdr.len_desc); | |
1205 | return MFM_DATA; | |
1206 | } | |
1207 | #ifdef DEBUG | |
1208 | printk("hdr accepted\n"); | |
1209 | #endif | |
1210 | if (!(raw = scan_sync (raw, end))) { | |
1211 | printk(KERN_INFO "dos_read: no data sync on track " | |
1212 | "%d, unit %d for sector%d, disk sector %d\n", | |
1213 | unit[drive].track, drive, scnt, hdr.sec); | |
1214 | return MFM_NOSYNC; | |
1215 | } | |
1216 | #ifdef DEBUG | |
1217 | dbg(raw); | |
1218 | #endif | |
1219 | ||
1220 | if (*((ushort *)raw)!=0x5545) { | |
1221 | printk(KERN_INFO "dos_read: no data mark after " | |
1222 | "sync (%d,%d,%d,%d) sc=%d\n", | |
1223 | hdr.track,hdr.side,hdr.sec,hdr.len_desc,scnt); | |
1224 | return MFM_NOSYNC; | |
1225 | } | |
1226 | ||
1227 | raw+=2; /* skip data mark (included in checksum) */ | |
1228 | raw = dos_decode((unsigned char *)(unit[drive].trackbuf + (hdr.sec - 1) * 512), (ushort *) raw, 512); | |
1229 | raw = dos_decode((unsigned char *)data_crc,(ushort *) raw,4); | |
1230 | crc = dos_data_crc(unit[drive].trackbuf + (hdr.sec - 1) * 512); | |
1231 | ||
1232 | if (crc != data_crc[0]) { | |
1233 | printk(KERN_INFO "dos_read: MFM_DATA (%d,%d,%d,%d) " | |
1234 | "sc=%d, %x %x\n", hdr.track, hdr.side, | |
1235 | hdr.sec, hdr.len_desc, scnt,data_crc[0], crc); | |
1236 | printk(KERN_INFO "data=(%lx,%lx,%lx,%lx,...)\n", | |
1237 | ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[0], | |
1238 | ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[1], | |
1239 | ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[2], | |
1240 | ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[3]); | |
1241 | return MFM_DATA; | |
1242 | } | |
1243 | } | |
1244 | return 0; | |
1245 | } | |
1246 | ||
1247 | static inline ushort dos_encode_byte(unsigned char byte) | |
1248 | { | |
1249 | register unsigned char *enc, b2, b1; | |
1250 | register ushort word; | |
1251 | ||
1252 | enc=mfmencode; | |
1253 | b1=byte; | |
1254 | b2=b1>>4; | |
1255 | b1&=15; | |
1256 | word=enc[b2] <<8 | enc [b1]; | |
1257 | return (word|((word&(256|64)) ? 0: 128)); | |
1258 | } | |
1259 | ||
1260 | static void dos_encode_block(ushort *dest, unsigned char *src, int len) | |
1261 | { | |
1262 | int i; | |
1263 | ||
1264 | for (i = 0; i < len; i++) { | |
1265 | *dest=dos_encode_byte(*src++); | |
1266 | *dest|=((dest[-1]&1)||(*dest&0x4000))? 0: 0x8000; | |
1267 | dest++; | |
1268 | } | |
1269 | } | |
1270 | ||
1271 | static unsigned long *ms_putsec(int drive, unsigned long *raw, int cnt) | |
1272 | { | |
1273 | static struct dos_header hdr={0,0,0,2,0, | |
1274 | {78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78}}; | |
1275 | int i; | |
1276 | static ushort crc[2]={0,0x4e4e}; | |
1277 | ||
1278 | drive&=3; | |
1279 | /* id gap 1 */ | |
1280 | /* the MFM word before is always 9254 */ | |
1281 | for(i=0;i<6;i++) | |
1282 | *raw++=0xaaaaaaaa; | |
1283 | /* 3 sync + 1 headermark */ | |
1284 | *raw++=0x44894489; | |
1285 | *raw++=0x44895554; | |
1286 | ||
1287 | /* fill in the variable parts of the header */ | |
1288 | hdr.track=unit[drive].track/unit[drive].type->heads; | |
1289 | hdr.side=unit[drive].track%unit[drive].type->heads; | |
1290 | hdr.sec=cnt+1; | |
1291 | hdr.crc=dos_hdr_crc(&hdr); | |
1292 | ||
1293 | /* header (without "magic") and id gap 2*/ | |
1294 | dos_encode_block((ushort *)raw,(unsigned char *) &hdr.track,28); | |
1295 | raw+=14; | |
1296 | ||
1297 | /*id gap 3 */ | |
1298 | for(i=0;i<6;i++) | |
1299 | *raw++=0xaaaaaaaa; | |
1300 | ||
1301 | /* 3 syncs and 1 datamark */ | |
1302 | *raw++=0x44894489; | |
1303 | *raw++=0x44895545; | |
1304 | ||
1305 | /* data */ | |
1306 | dos_encode_block((ushort *)raw, | |
1307 | (unsigned char *)unit[drive].trackbuf+cnt*512,512); | |
1308 | raw+=256; | |
1309 | ||
1310 | /*data crc + jd's special gap (long words :-/) */ | |
1311 | crc[0]=dos_data_crc(unit[drive].trackbuf+cnt*512); | |
1312 | dos_encode_block((ushort *) raw,(unsigned char *)crc,4); | |
1313 | raw+=2; | |
1314 | ||
1315 | /* data gap */ | |
1316 | for(i=0;i<38;i++) | |
1317 | *raw++=0x92549254; | |
1318 | ||
1319 | return raw; /* wrote 652 MFM words */ | |
1320 | } | |
1321 | ||
1322 | static void dos_write(int disk) | |
1323 | { | |
1324 | int cnt; | |
1325 | unsigned long raw = (unsigned long) raw_buf; | |
1326 | unsigned long *ptr=(unsigned long *)raw; | |
1327 | ||
1328 | disk&=3; | |
1329 | /* really gap4 + indexgap , but we write it first and round it up */ | |
1330 | for (cnt=0;cnt<425;cnt++) | |
1331 | *ptr++=0x92549254; | |
1332 | ||
1333 | /* the following is just guessed */ | |
1334 | if (unit[disk].type->sect_mult==2) /* check for HD-Disks */ | |
1335 | for(cnt=0;cnt<473;cnt++) | |
1336 | *ptr++=0x92549254; | |
1337 | ||
1338 | /* now the index marks...*/ | |
1339 | for (cnt=0;cnt<20;cnt++) | |
1340 | *ptr++=0x92549254; | |
1341 | for (cnt=0;cnt<6;cnt++) | |
1342 | *ptr++=0xaaaaaaaa; | |
1343 | *ptr++=0x52245224; | |
1344 | *ptr++=0x52245552; | |
1345 | for (cnt=0;cnt<20;cnt++) | |
1346 | *ptr++=0x92549254; | |
1347 | ||
1348 | /* sectors */ | |
1349 | for(cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++) | |
1350 | ptr=ms_putsec(disk,ptr,cnt); | |
1351 | ||
1352 | *(ushort *)ptr = 0xaaa8; /* MFM word before is always 0x9254 */ | |
1353 | } | |
1354 | ||
1355 | /* | |
1356 | * Here comes the high level stuff (i.e. the filesystem interface) | |
1357 | * and helper functions. | |
1358 | * Normally this should be the only part that has to be adapted to | |
1359 | * different kernel versions. | |
1360 | */ | |
1361 | ||
1362 | /* FIXME: this assumes the drive is still spinning - | |
1363 | * which is only true if we complete writing a track within three seconds | |
1364 | */ | |
cbb9d178 | 1365 | static void flush_track_callback(struct timer_list *timer) |
1da177e4 | 1366 | { |
cbb9d178 KC |
1367 | unsigned long nr = ((unsigned long)timer - |
1368 | (unsigned long)&flush_track_timer[0]) / | |
1369 | sizeof(flush_track_timer[0]); | |
1370 | ||
1da177e4 LT |
1371 | nr&=3; |
1372 | writefromint = 1; | |
1373 | if (!try_fdc(nr)) { | |
1374 | /* we might block in an interrupt, so try again later */ | |
1375 | flush_track_timer[nr].expires = jiffies + 1; | |
1376 | add_timer(flush_track_timer + nr); | |
1377 | return; | |
1378 | } | |
1379 | get_fdc(nr); | |
1380 | (*unit[nr].dtype->write_fkt)(nr); | |
1381 | if (!raw_write(nr)) { | |
1382 | printk (KERN_NOTICE "floppy disk write protected\n"); | |
1383 | writefromint = 0; | |
1384 | writepending = 0; | |
1385 | } | |
1386 | rel_fdc(); | |
1387 | } | |
1388 | ||
1389 | static int non_int_flush_track (unsigned long nr) | |
1390 | { | |
1391 | unsigned long flags; | |
1392 | ||
1393 | nr&=3; | |
1394 | writefromint = 0; | |
1395 | del_timer(&post_write_timer); | |
1396 | get_fdc(nr); | |
1397 | if (!fd_motor_on(nr)) { | |
1398 | writepending = 0; | |
1399 | rel_fdc(); | |
1400 | return 0; | |
1401 | } | |
1402 | local_irq_save(flags); | |
1403 | if (writepending != 2) { | |
1404 | local_irq_restore(flags); | |
1405 | (*unit[nr].dtype->write_fkt)(nr); | |
1406 | if (!raw_write(nr)) { | |
1407 | printk (KERN_NOTICE "floppy disk write protected " | |
1408 | "in write!\n"); | |
1409 | writepending = 0; | |
1410 | return 0; | |
1411 | } | |
6d0be946 | 1412 | wait_event(wait_fd_block, block_flag != 2); |
1da177e4 LT |
1413 | } |
1414 | else { | |
1415 | local_irq_restore(flags); | |
1416 | ms_delay(2); /* 2 ms post_write delay */ | |
1417 | post_write(nr); | |
1418 | } | |
1419 | rel_fdc(); | |
1420 | return 1; | |
1421 | } | |
1422 | ||
1423 | static int get_track(int drive, int track) | |
1424 | { | |
1425 | int error, errcnt; | |
1426 | ||
1427 | drive&=3; | |
1428 | if (unit[drive].track == track) | |
1429 | return 0; | |
1430 | get_fdc(drive); | |
1431 | if (!fd_motor_on(drive)) { | |
1432 | rel_fdc(); | |
1433 | return -1; | |
1434 | } | |
1435 | ||
1436 | if (unit[drive].dirty == 1) { | |
1437 | del_timer (flush_track_timer + drive); | |
1438 | non_int_flush_track (drive); | |
1439 | } | |
1440 | errcnt = 0; | |
1441 | while (errcnt < MAX_ERRORS) { | |
1442 | if (!fd_seek(drive, track)) | |
1443 | return -1; | |
1444 | raw_read(drive); | |
1445 | error = (*unit[drive].dtype->read_fkt)(drive); | |
1446 | if (error == 0) { | |
1447 | rel_fdc(); | |
1448 | return 0; | |
1449 | } | |
1450 | /* Read Error Handling: recalibrate and try again */ | |
1451 | unit[drive].track = -1; | |
1452 | errcnt++; | |
1453 | } | |
1454 | rel_fdc(); | |
1455 | return -1; | |
1456 | } | |
1457 | ||
21b07f35 OS |
1458 | static blk_status_t amiflop_rw_cur_segment(struct amiga_floppy_struct *floppy, |
1459 | struct request *rq) | |
1da177e4 | 1460 | { |
21b07f35 | 1461 | int drive = floppy - unit; |
1da177e4 | 1462 | unsigned int cnt, block, track, sector; |
1da177e4 | 1463 | char *data; |
1da177e4 | 1464 | |
21b07f35 | 1465 | for (cnt = 0; cnt < blk_rq_cur_sectors(rq); cnt++) { |
1da177e4 LT |
1466 | #ifdef DEBUG |
1467 | printk("fd: sector %ld + %d requested for %s\n", | |
9e31bebe TH |
1468 | blk_rq_pos(rq), cnt, |
1469 | (rq_data_dir(rq) == READ) ? "read" : "write"); | |
1da177e4 | 1470 | #endif |
9e31bebe | 1471 | block = blk_rq_pos(rq) + cnt; |
1da177e4 LT |
1472 | track = block / (floppy->dtype->sects * floppy->type->sect_mult); |
1473 | sector = block % (floppy->dtype->sects * floppy->type->sect_mult); | |
b4f42e28 | 1474 | data = bio_data(rq->bio) + 512 * cnt; |
1da177e4 LT |
1475 | #ifdef DEBUG |
1476 | printk("access to track %d, sector %d, with buffer at " | |
1477 | "0x%08lx\n", track, sector, data); | |
1478 | #endif | |
1479 | ||
21b07f35 OS |
1480 | if (get_track(drive, track) == -1) |
1481 | return BLK_STS_IOERR; | |
1da177e4 | 1482 | |
9e31bebe | 1483 | if (rq_data_dir(rq) == READ) { |
1da177e4 | 1484 | memcpy(data, floppy->trackbuf + sector * 512, 512); |
9e31bebe | 1485 | } else { |
1da177e4 LT |
1486 | memcpy(floppy->trackbuf + sector * 512, data, 512); |
1487 | ||
1488 | /* keep the drive spinning while writes are scheduled */ | |
21b07f35 OS |
1489 | if (!fd_motor_on(drive)) |
1490 | return BLK_STS_IOERR; | |
1da177e4 LT |
1491 | /* |
1492 | * setup a callback to write the track buffer | |
1493 | * after a short (1 tick) delay. | |
1494 | */ | |
1da177e4 LT |
1495 | floppy->dirty = 1; |
1496 | /* reset the timer */ | |
1497 | mod_timer (flush_track_timer + drive, jiffies + 1); | |
1da177e4 LT |
1498 | } |
1499 | } | |
1da177e4 | 1500 | |
21b07f35 | 1501 | return BLK_STS_OK; |
1da177e4 LT |
1502 | } |
1503 | ||
21b07f35 OS |
1504 | static blk_status_t amiflop_queue_rq(struct blk_mq_hw_ctx *hctx, |
1505 | const struct blk_mq_queue_data *bd) | |
1da177e4 | 1506 | { |
21b07f35 OS |
1507 | struct request *rq = bd->rq; |
1508 | struct amiga_floppy_struct *floppy = rq->rq_disk->private_data; | |
1509 | blk_status_t err; | |
1510 | ||
1511 | if (!spin_trylock_irq(&amiflop_lock)) | |
1512 | return BLK_STS_DEV_RESOURCE; | |
1513 | ||
1514 | blk_mq_start_request(rq); | |
1515 | ||
1516 | do { | |
1517 | err = amiflop_rw_cur_segment(floppy, rq); | |
1518 | } while (blk_update_request(rq, err, blk_rq_cur_bytes(rq))); | |
1519 | blk_mq_end_request(rq, err); | |
1520 | ||
1521 | spin_unlock_irq(&amiflop_lock); | |
1522 | return BLK_STS_OK; | |
1da177e4 LT |
1523 | } |
1524 | ||
a885c8c4 CH |
1525 | static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1526 | { | |
1527 | int drive = MINOR(bdev->bd_dev) & 3; | |
1528 | ||
1529 | geo->heads = unit[drive].type->heads; | |
1530 | geo->sectors = unit[drive].dtype->sects * unit[drive].type->sect_mult; | |
1531 | geo->cylinders = unit[drive].type->tracks; | |
1532 | return 0; | |
1533 | } | |
1534 | ||
8a6cfeb6 | 1535 | static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
1536 | unsigned int cmd, unsigned long param) |
1537 | { | |
47225db5 AV |
1538 | struct amiga_floppy_struct *p = bdev->bd_disk->private_data; |
1539 | int drive = p - unit; | |
1da177e4 | 1540 | static struct floppy_struct getprm; |
8a423e54 | 1541 | void __user *argp = (void __user *)param; |
1da177e4 LT |
1542 | |
1543 | switch(cmd){ | |
1da177e4 LT |
1544 | case FDFMTBEG: |
1545 | get_fdc(drive); | |
1546 | if (fd_ref[drive] > 1) { | |
1547 | rel_fdc(); | |
1548 | return -EBUSY; | |
1549 | } | |
47225db5 | 1550 | fsync_bdev(bdev); |
1da177e4 LT |
1551 | if (fd_motor_on(drive) == 0) { |
1552 | rel_fdc(); | |
1553 | return -ENODEV; | |
1554 | } | |
1555 | if (fd_calibrate(drive) == 0) { | |
1556 | rel_fdc(); | |
1557 | return -ENXIO; | |
1558 | } | |
1559 | floppy_off(drive); | |
1560 | rel_fdc(); | |
1561 | break; | |
1562 | case FDFMTTRK: | |
47225db5 | 1563 | if (param < p->type->tracks * p->type->heads) |
1da177e4 LT |
1564 | { |
1565 | get_fdc(drive); | |
1566 | if (fd_seek(drive,param) != 0){ | |
47225db5 AV |
1567 | memset(p->trackbuf, FD_FILL_BYTE, |
1568 | p->dtype->sects * p->type->sect_mult * 512); | |
1da177e4 LT |
1569 | non_int_flush_track(drive); |
1570 | } | |
1571 | floppy_off(drive); | |
1572 | rel_fdc(); | |
1573 | } | |
1574 | else | |
1575 | return -EINVAL; | |
1576 | break; | |
1577 | case FDFMTEND: | |
1578 | floppy_off(drive); | |
47225db5 | 1579 | invalidate_bdev(bdev); |
1da177e4 LT |
1580 | break; |
1581 | case FDGETPRM: | |
1582 | memset((void *)&getprm, 0, sizeof (getprm)); | |
47225db5 AV |
1583 | getprm.track=p->type->tracks; |
1584 | getprm.head=p->type->heads; | |
1585 | getprm.sect=p->dtype->sects * p->type->sect_mult; | |
1586 | getprm.size=p->blocks; | |
8a423e54 | 1587 | if (copy_to_user(argp, &getprm, sizeof(struct floppy_struct))) |
1da177e4 LT |
1588 | return -EFAULT; |
1589 | break; | |
1590 | case FDSETPRM: | |
1591 | case FDDEFPRM: | |
1592 | return -EINVAL; | |
1593 | case FDFLUSH: /* unconditionally, even if not needed */ | |
1594 | del_timer (flush_track_timer + drive); | |
1595 | non_int_flush_track(drive); | |
1596 | break; | |
1597 | #ifdef RAW_IOCTL | |
1598 | case IOCTL_RAW_TRACK: | |
47225db5 | 1599 | if (copy_to_user(argp, raw_buf, p->type->read_size)) |
1da177e4 LT |
1600 | return -EFAULT; |
1601 | else | |
47225db5 | 1602 | return p->type->read_size; |
1da177e4 LT |
1603 | #endif |
1604 | default: | |
1da177e4 LT |
1605 | return -ENOSYS; |
1606 | } | |
1607 | return 0; | |
1608 | } | |
1609 | ||
8a6cfeb6 AB |
1610 | static int fd_ioctl(struct block_device *bdev, fmode_t mode, |
1611 | unsigned int cmd, unsigned long param) | |
1612 | { | |
1613 | int ret; | |
1614 | ||
2a48fc0a | 1615 | mutex_lock(&amiflop_mutex); |
8a6cfeb6 | 1616 | ret = fd_locked_ioctl(bdev, mode, cmd, param); |
2a48fc0a | 1617 | mutex_unlock(&amiflop_mutex); |
8a6cfeb6 AB |
1618 | |
1619 | return ret; | |
1620 | } | |
1621 | ||
1da177e4 LT |
1622 | static void fd_probe(int dev) |
1623 | { | |
1624 | unsigned long code; | |
1625 | int type; | |
1626 | int drive; | |
1627 | ||
1628 | drive = dev & 3; | |
1629 | code = fd_get_drive_id(drive); | |
1630 | ||
1631 | /* get drive type */ | |
1632 | for (type = 0; type < num_dr_types; type++) | |
1633 | if (drive_types[type].code == code) | |
1634 | break; | |
1635 | ||
1636 | if (type >= num_dr_types) { | |
1637 | printk(KERN_WARNING "fd_probe: unsupported drive type " | |
1638 | "%08lx found\n", code); | |
1639 | unit[drive].type = &drive_types[num_dr_types-1]; /* FD_NODRIVE */ | |
1640 | return; | |
1641 | } | |
1642 | ||
1643 | unit[drive].type = drive_types + type; | |
1644 | unit[drive].track = -1; | |
1645 | ||
1646 | unit[drive].disk = -1; | |
1647 | unit[drive].motor = 0; | |
1648 | unit[drive].busy = 0; | |
1649 | unit[drive].status = -1; | |
1650 | } | |
1651 | ||
1652 | /* | |
1653 | * floppy_open check for aliasing (/dev/fd0 can be the same as | |
1654 | * /dev/PS0 etc), and disallows simultaneous access to the same | |
1655 | * drive with different device numbers. | |
1656 | */ | |
47225db5 | 1657 | static int floppy_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 1658 | { |
47225db5 AV |
1659 | int drive = MINOR(bdev->bd_dev) & 3; |
1660 | int system = (MINOR(bdev->bd_dev) & 4) >> 2; | |
1da177e4 LT |
1661 | int old_dev; |
1662 | unsigned long flags; | |
1663 | ||
2a48fc0a | 1664 | mutex_lock(&amiflop_mutex); |
1da177e4 LT |
1665 | old_dev = fd_device[drive]; |
1666 | ||
6e9624b8 | 1667 | if (fd_ref[drive] && old_dev != system) { |
2a48fc0a | 1668 | mutex_unlock(&amiflop_mutex); |
1da177e4 | 1669 | return -EBUSY; |
6e9624b8 | 1670 | } |
1da177e4 | 1671 | |
0033a9b4 CH |
1672 | if (unit[drive].type->code == FD_NODRIVE) { |
1673 | mutex_unlock(&amiflop_mutex); | |
1674 | return -ENXIO; | |
1675 | } | |
1676 | ||
47225db5 | 1677 | if (mode & (FMODE_READ|FMODE_WRITE)) { |
acdfd443 | 1678 | bdev_check_media_change(bdev); |
47225db5 | 1679 | if (mode & FMODE_WRITE) { |
1da177e4 LT |
1680 | int wrprot; |
1681 | ||
1682 | get_fdc(drive); | |
1683 | fd_select (drive); | |
1684 | wrprot = !(ciaa.pra & DSKPROT); | |
1685 | fd_deselect (drive); | |
1686 | rel_fdc(); | |
1687 | ||
6e9624b8 | 1688 | if (wrprot) { |
2a48fc0a | 1689 | mutex_unlock(&amiflop_mutex); |
1da177e4 | 1690 | return -EROFS; |
6e9624b8 | 1691 | } |
1da177e4 LT |
1692 | } |
1693 | } | |
1694 | ||
1695 | local_irq_save(flags); | |
1696 | fd_ref[drive]++; | |
1697 | fd_device[drive] = system; | |
1698 | local_irq_restore(flags); | |
1699 | ||
1700 | unit[drive].dtype=&data_types[system]; | |
1701 | unit[drive].blocks=unit[drive].type->heads*unit[drive].type->tracks* | |
1702 | data_types[system].sects*unit[drive].type->sect_mult; | |
0033a9b4 | 1703 | set_capacity(unit[drive].gendisk[system], unit[drive].blocks); |
1da177e4 LT |
1704 | |
1705 | printk(KERN_INFO "fd%d: accessing %s-disk with %s-layout\n",drive, | |
1706 | unit[drive].type->name, data_types[system].name); | |
1707 | ||
2a48fc0a | 1708 | mutex_unlock(&amiflop_mutex); |
1da177e4 LT |
1709 | return 0; |
1710 | } | |
1711 | ||
db2a144b | 1712 | static void floppy_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 1713 | { |
47225db5 AV |
1714 | struct amiga_floppy_struct *p = disk->private_data; |
1715 | int drive = p - unit; | |
1da177e4 | 1716 | |
2a48fc0a | 1717 | mutex_lock(&amiflop_mutex); |
1da177e4 LT |
1718 | if (unit[drive].dirty == 1) { |
1719 | del_timer (flush_track_timer + drive); | |
1720 | non_int_flush_track (drive); | |
1721 | } | |
1722 | ||
1723 | if (!fd_ref[drive]--) { | |
1724 | printk(KERN_CRIT "floppy_release with fd_ref == 0"); | |
1725 | fd_ref[drive] = 0; | |
1726 | } | |
1727 | #ifdef MODULE | |
cbb9d178 | 1728 | floppy_off (drive); |
1da177e4 | 1729 | #endif |
2a48fc0a | 1730 | mutex_unlock(&amiflop_mutex); |
1da177e4 LT |
1731 | } |
1732 | ||
1733 | /* | |
1a8a74f0 | 1734 | * check_events is never called from an interrupt, so we can relax a bit |
1da177e4 LT |
1735 | * here, sleep etc. Note that floppy-on tries to set current_DOR to point |
1736 | * to the desired drive, but it will probably not survive the sleep if | |
1737 | * several floppies are used at the same time: thus the loop. | |
1738 | */ | |
1a8a74f0 | 1739 | static unsigned amiga_check_events(struct gendisk *disk, unsigned int clearing) |
1da177e4 LT |
1740 | { |
1741 | struct amiga_floppy_struct *p = disk->private_data; | |
1742 | int drive = p - unit; | |
1743 | int changed; | |
1744 | static int first_time = 1; | |
1745 | ||
1746 | if (first_time) | |
1747 | changed = first_time--; | |
1748 | else { | |
1749 | get_fdc(drive); | |
1750 | fd_select (drive); | |
1751 | changed = !(ciaa.pra & DSKCHANGE); | |
1752 | fd_deselect (drive); | |
1753 | rel_fdc(); | |
1754 | } | |
1755 | ||
1756 | if (changed) { | |
1757 | fd_probe(drive); | |
1758 | p->track = -1; | |
1759 | p->dirty = 0; | |
1760 | writepending = 0; /* if this was true before, too bad! */ | |
1761 | writefromint = 0; | |
1a8a74f0 | 1762 | return DISK_EVENT_MEDIA_CHANGE; |
1da177e4 LT |
1763 | } |
1764 | return 0; | |
1765 | } | |
1766 | ||
83d5cde4 | 1767 | static const struct block_device_operations floppy_fops = { |
1da177e4 | 1768 | .owner = THIS_MODULE, |
47225db5 AV |
1769 | .open = floppy_open, |
1770 | .release = floppy_release, | |
8a6cfeb6 | 1771 | .ioctl = fd_ioctl, |
a885c8c4 | 1772 | .getgeo = fd_getgeo, |
1a8a74f0 | 1773 | .check_events = amiga_check_events, |
1da177e4 LT |
1774 | }; |
1775 | ||
21b07f35 OS |
1776 | static const struct blk_mq_ops amiflop_mq_ops = { |
1777 | .queue_rq = amiflop_queue_rq, | |
1778 | }; | |
1779 | ||
0033a9b4 | 1780 | static int fd_alloc_disk(int drive, int system) |
53d0f8db OS |
1781 | { |
1782 | struct gendisk *disk; | |
a2379420 | 1783 | int err; |
53d0f8db | 1784 | |
f6d82974 CH |
1785 | disk = blk_mq_alloc_disk(&unit[drive].tag_set, NULL); |
1786 | if (IS_ERR(disk)) | |
1787 | return PTR_ERR(disk); | |
53d0f8db | 1788 | |
0033a9b4 CH |
1789 | disk->major = FLOPPY_MAJOR; |
1790 | disk->first_minor = drive + system; | |
f6d82974 | 1791 | disk->minors = 1; |
0033a9b4 CH |
1792 | disk->fops = &floppy_fops; |
1793 | disk->events = DISK_EVENT_MEDIA_CHANGE; | |
1794 | if (system) | |
1795 | sprintf(disk->disk_name, "fd%d_msdos", drive); | |
1796 | else | |
1797 | sprintf(disk->disk_name, "fd%d", drive); | |
1798 | disk->private_data = &unit[drive]; | |
1799 | set_capacity(disk, 880 * 2); | |
1800 | ||
1801 | unit[drive].gendisk[system] = disk; | |
a2379420 LC |
1802 | err = add_disk(disk); |
1803 | if (err) | |
1804 | blk_cleanup_disk(disk); | |
1805 | return err; | |
0033a9b4 CH |
1806 | } |
1807 | ||
1808 | static int fd_alloc_drive(int drive) | |
1809 | { | |
53d0f8db OS |
1810 | unit[drive].trackbuf = kmalloc(FLOPPY_MAX_SECTORS * 512, GFP_KERNEL); |
1811 | if (!unit[drive].trackbuf) | |
0033a9b4 | 1812 | goto out; |
53d0f8db | 1813 | |
0033a9b4 CH |
1814 | memset(&unit[drive].tag_set, 0, sizeof(unit[drive].tag_set)); |
1815 | unit[drive].tag_set.ops = &amiflop_mq_ops; | |
1816 | unit[drive].tag_set.nr_hw_queues = 1; | |
1817 | unit[drive].tag_set.nr_maps = 1; | |
1818 | unit[drive].tag_set.queue_depth = 2; | |
1819 | unit[drive].tag_set.numa_node = NUMA_NO_NODE; | |
1820 | unit[drive].tag_set.flags = BLK_MQ_F_SHOULD_MERGE; | |
1821 | if (blk_mq_alloc_tag_set(&unit[drive].tag_set)) | |
1822 | goto out_cleanup_trackbuf; | |
53d0f8db | 1823 | |
0033a9b4 CH |
1824 | pr_cont(" fd%d", drive); |
1825 | ||
1826 | if (fd_alloc_disk(drive, 0) || fd_alloc_disk(drive, 1)) | |
1827 | goto out_cleanup_tagset; | |
1828 | return 0; | |
1829 | ||
1830 | out_cleanup_tagset: | |
21b07f35 | 1831 | blk_mq_free_tag_set(&unit[drive].tag_set); |
0033a9b4 CH |
1832 | out_cleanup_trackbuf: |
1833 | kfree(unit[drive].trackbuf); | |
53d0f8db OS |
1834 | out: |
1835 | unit[drive].type->code = FD_NODRIVE; | |
0033a9b4 | 1836 | return -ENOMEM; |
53d0f8db OS |
1837 | } |
1838 | ||
1da177e4 LT |
1839 | static int __init fd_probe_drives(void) |
1840 | { | |
1841 | int drive,drives,nomem; | |
1842 | ||
53d0f8db | 1843 | pr_info("FD: probing units\nfound"); |
1da177e4 LT |
1844 | drives=0; |
1845 | nomem=0; | |
1846 | for(drive=0;drive<FD_MAX_UNITS;drive++) { | |
1da177e4 LT |
1847 | fd_probe(drive); |
1848 | if (unit[drive].type->code == FD_NODRIVE) | |
1849 | continue; | |
53d0f8db | 1850 | |
0033a9b4 | 1851 | if (fd_alloc_drive(drive) < 0) { |
53d0f8db OS |
1852 | pr_cont(" no mem for fd%d", drive); |
1853 | nomem = 1; | |
1da177e4 LT |
1854 | continue; |
1855 | } | |
1da177e4 | 1856 | drives++; |
1da177e4 LT |
1857 | } |
1858 | if ((drives > 0) || (nomem == 0)) { | |
1859 | if (drives == 0) | |
53d0f8db OS |
1860 | pr_cont(" no drives"); |
1861 | pr_cont("\n"); | |
1da177e4 LT |
1862 | return drives; |
1863 | } | |
53d0f8db | 1864 | pr_cont("\n"); |
1da177e4 LT |
1865 | return -ENOMEM; |
1866 | } | |
1867 | ||
92183b34 | 1868 | static int __init amiga_floppy_probe(struct platform_device *pdev) |
1da177e4 LT |
1869 | { |
1870 | int i, ret; | |
1871 | ||
1da177e4 LT |
1872 | if (register_blkdev(FLOPPY_MAJOR,"fd")) |
1873 | return -EBUSY; | |
1874 | ||
1da177e4 | 1875 | ret = -ENOMEM; |
059718d5 GU |
1876 | raw_buf = amiga_chip_alloc(RAW_BUF_SIZE, "Floppy"); |
1877 | if (!raw_buf) { | |
1da177e4 | 1878 | printk("fd: cannot get chip mem buffer\n"); |
92183b34 | 1879 | goto out_blkdev; |
1da177e4 LT |
1880 | } |
1881 | ||
1882 | ret = -EBUSY; | |
1883 | if (request_irq(IRQ_AMIGA_DSKBLK, fd_block_done, 0, "floppy_dma", NULL)) { | |
1884 | printk("fd: cannot get irq for dma\n"); | |
1885 | goto out_irq; | |
1886 | } | |
1887 | ||
1888 | if (request_irq(IRQ_AMIGA_CIAA_TB, ms_isr, 0, "floppy_timer", NULL)) { | |
1889 | printk("fd: cannot get irq for timer\n"); | |
1890 | goto out_irq2; | |
1891 | } | |
1892 | ||
fd5b462f | 1893 | ret = -ENODEV; |
1da177e4 LT |
1894 | if (fd_probe_drives() < 1) /* No usable drives */ |
1895 | goto out_probe; | |
1896 | ||
1da177e4 | 1897 | /* initialize variables */ |
cbb9d178 | 1898 | timer_setup(&motor_on_timer, motor_on_callback, 0); |
1da177e4 | 1899 | motor_on_timer.expires = 0; |
1da177e4 | 1900 | for (i = 0; i < FD_MAX_UNITS; i++) { |
cbb9d178 | 1901 | timer_setup(&motor_off_timer[i], fd_motor_off, 0); |
1da177e4 | 1902 | motor_off_timer[i].expires = 0; |
cbb9d178 | 1903 | timer_setup(&flush_track_timer[i], flush_track_callback, 0); |
1da177e4 | 1904 | flush_track_timer[i].expires = 0; |
1da177e4 LT |
1905 | |
1906 | unit[i].track = -1; | |
1907 | } | |
1908 | ||
cbb9d178 | 1909 | timer_setup(&post_write_timer, post_write_callback, 0); |
1da177e4 | 1910 | post_write_timer.expires = 0; |
1da177e4 LT |
1911 | |
1912 | for (i = 0; i < 128; i++) | |
1913 | mfmdecode[i]=255; | |
1914 | for (i = 0; i < 16; i++) | |
1915 | mfmdecode[mfmencode[i]]=i; | |
1916 | ||
1917 | /* make sure that disk DMA is enabled */ | |
1918 | custom.dmacon = DMAF_SETCLR | DMAF_DISK; | |
1919 | ||
1920 | /* init ms timer */ | |
1921 | ciaa.crb = 8; /* one-shot, stop */ | |
1922 | return 0; | |
1923 | ||
1924 | out_probe: | |
1da177e4 LT |
1925 | free_irq(IRQ_AMIGA_CIAA_TB, NULL); |
1926 | out_irq2: | |
1927 | free_irq(IRQ_AMIGA_DSKBLK, NULL); | |
1928 | out_irq: | |
1929 | amiga_chip_free(raw_buf); | |
1da177e4 LT |
1930 | out_blkdev: |
1931 | unregister_blkdev(FLOPPY_MAJOR,"fd"); | |
1932 | return ret; | |
1933 | } | |
1934 | ||
92183b34 GU |
1935 | static struct platform_driver amiga_floppy_driver = { |
1936 | .driver = { | |
1937 | .name = "amiga-floppy", | |
92183b34 GU |
1938 | }, |
1939 | }; | |
1940 | ||
1941 | static int __init amiga_floppy_init(void) | |
1942 | { | |
1943 | return platform_driver_probe(&amiga_floppy_driver, amiga_floppy_probe); | |
1944 | } | |
1945 | ||
1946 | module_init(amiga_floppy_init); | |
1947 | ||
1948 | #ifndef MODULE | |
63907435 AV |
1949 | static int __init amiga_floppy_setup (char *str) |
1950 | { | |
1951 | int n; | |
1952 | if (!MACH_IS_AMIGA) | |
1953 | return 0; | |
1954 | if (!get_option(&str, &n)) | |
1955 | return 0; | |
1956 | printk (KERN_INFO "amiflop: Setting default df0 to %x\n", n); | |
1957 | fd_def_df0 = n; | |
9b41046c | 1958 | return 1; |
63907435 AV |
1959 | } |
1960 | ||
1961 | __setup("floppy=", amiga_floppy_setup); | |
1da177e4 | 1962 | #endif |
92183b34 GU |
1963 | |
1964 | MODULE_ALIAS("platform:amiga-floppy"); |