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Linux-2.6.12-rc2
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / block / ataflop.c
1 /*
2 * drivers/block/ataflop.c
3 *
4 * Copyright (C) 1993 Greg Harp
5 * Atari Support by Bjoern Brauel, Roman Hodek
6 *
7 * Big cleanup Sep 11..14 1994 Roman Hodek:
8 * - Driver now works interrupt driven
9 * - Support for two drives; should work, but I cannot test that :-(
10 * - Reading is done in whole tracks and buffered to speed up things
11 * - Disk change detection and drive deselecting after motor-off
12 * similar to TOS
13 * - Autodetection of disk format (DD/HD); untested yet, because I
14 * don't have an HD drive :-(
15 *
16 * Fixes Nov 13 1994 Martin Schaller:
17 * - Autodetection works now
18 * - Support for 5 1/4'' disks
19 * - Removed drive type (unknown on atari)
20 * - Do seeks with 8 Mhz
21 *
22 * Changes by Andreas Schwab:
23 * - After errors in multiple read mode try again reading single sectors
24 * (Feb 1995):
25 * - Clean up error handling
26 * - Set blk_size for proper size checking
27 * - Initialize track register when testing presence of floppy
28 * - Implement some ioctl's
29 *
30 * Changes by Torsten Lang:
31 * - When probing the floppies we should add the FDCCMDADD_H flag since
32 * the FDC will otherwise wait forever when no disk is inserted...
33 *
34 * ++ Freddi Aschwanden (fa) 20.9.95 fixes for medusa:
35 * - MFPDELAY() after each FDC access -> atari
36 * - more/other disk formats
37 * - DMA to the block buffer directly if we have a 32bit DMA
38 * - for medusa, the step rate is always 3ms
39 * - on medusa, use only cache_push()
40 * Roman:
41 * - Make disk format numbering independent from minors
42 * - Let user set max. supported drive type (speeds up format
43 * detection, saves buffer space)
44 *
45 * Roman 10/15/95:
46 * - implement some more ioctls
47 * - disk formatting
48 *
49 * Andreas 95/12/12:
50 * - increase gap size at start of track for HD/ED disks
51 *
52 * Michael (MSch) 11/07/96:
53 * - implemented FDSETPRM and FDDEFPRM ioctl
54 *
55 * Andreas (97/03/19):
56 * - implemented missing BLK* ioctls
57 *
58 * Things left to do:
59 * - Formatting
60 * - Maybe a better strategy for disk change detection (does anyone
61 * know one?)
62 */
63
64 #include <linux/module.h>
65
66 #include <linux/fd.h>
67 #include <linux/delay.h>
68 #include <linux/init.h>
69 #include <linux/blkdev.h>
70
71 #include <asm/atafd.h>
72 #include <asm/atafdreg.h>
73 #include <asm/atariints.h>
74 #include <asm/atari_stdma.h>
75 #include <asm/atari_stram.h>
76
77 #define FD_MAX_UNITS 2
78
79 #undef DEBUG
80
81 static struct request_queue *floppy_queue;
82
83 #define QUEUE (floppy_queue)
84 #define CURRENT elv_next_request(floppy_queue)
85
86 /* Disk types: DD, HD, ED */
87 static struct atari_disk_type {
88 const char *name;
89 unsigned spt; /* sectors per track */
90 unsigned blocks; /* total number of blocks */
91 unsigned fdc_speed; /* fdc_speed setting */
92 unsigned stretch; /* track doubling ? */
93 } disk_type[] = {
94 { "d360", 9, 720, 0, 0}, /* 0: 360kB diskette */
95 { "D360", 9, 720, 0, 1}, /* 1: 360kb in 720k or 1.2MB drive */
96 { "D720", 9,1440, 0, 0}, /* 2: 720kb in 720k or 1.2MB drive */
97 { "D820", 10,1640, 0, 0}, /* 3: DD disk with 82 tracks/10 sectors */
98 /* formats above are probed for type DD */
99 #define MAX_TYPE_DD 3
100 { "h1200",15,2400, 3, 0}, /* 4: 1.2MB diskette */
101 { "H1440",18,2880, 3, 0}, /* 5: 1.4 MB diskette (HD) */
102 { "H1640",20,3280, 3, 0}, /* 6: 1.64MB diskette (fat HD) 82 tr 20 sec */
103 /* formats above are probed for types DD and HD */
104 #define MAX_TYPE_HD 6
105 { "E2880",36,5760, 3, 0}, /* 7: 2.8 MB diskette (ED) */
106 { "E3280",40,6560, 3, 0}, /* 8: 3.2 MB diskette (fat ED) 82 tr 40 sec */
107 /* formats above are probed for types DD, HD and ED */
108 #define MAX_TYPE_ED 8
109 /* types below are never autoprobed */
110 { "H1680",21,3360, 3, 0}, /* 9: 1.68MB diskette (fat HD) 80 tr 21 sec */
111 { "h410",10,820, 0, 1}, /* 10: 410k diskette 41 tr 10 sec, stretch */
112 { "h1476",18,2952, 3, 0}, /* 11: 1.48MB diskette 82 tr 18 sec */
113 { "H1722",21,3444, 3, 0}, /* 12: 1.72MB diskette 82 tr 21 sec */
114 { "h420",10,840, 0, 1}, /* 13: 420k diskette 42 tr 10 sec, stretch */
115 { "H830",10,1660, 0, 0}, /* 14: 820k diskette 83 tr 10 sec */
116 { "h1494",18,2952, 3, 0}, /* 15: 1.49MB diskette 83 tr 18 sec */
117 { "H1743",21,3486, 3, 0}, /* 16: 1.74MB diskette 83 tr 21 sec */
118 { "h880",11,1760, 0, 0}, /* 17: 880k diskette 80 tr 11 sec */
119 { "D1040",13,2080, 0, 0}, /* 18: 1.04MB diskette 80 tr 13 sec */
120 { "D1120",14,2240, 0, 0}, /* 19: 1.12MB diskette 80 tr 14 sec */
121 { "h1600",20,3200, 3, 0}, /* 20: 1.60MB diskette 80 tr 20 sec */
122 { "H1760",22,3520, 3, 0}, /* 21: 1.76MB diskette 80 tr 22 sec */
123 { "H1920",24,3840, 3, 0}, /* 22: 1.92MB diskette 80 tr 24 sec */
124 { "E3200",40,6400, 3, 0}, /* 23: 3.2MB diskette 80 tr 40 sec */
125 { "E3520",44,7040, 3, 0}, /* 24: 3.52MB diskette 80 tr 44 sec */
126 { "E3840",48,7680, 3, 0}, /* 25: 3.84MB diskette 80 tr 48 sec */
127 { "H1840",23,3680, 3, 0}, /* 26: 1.84MB diskette 80 tr 23 sec */
128 { "D800",10,1600, 0, 0}, /* 27: 800k diskette 80 tr 10 sec */
129 };
130
131 static int StartDiskType[] = {
132 MAX_TYPE_DD,
133 MAX_TYPE_HD,
134 MAX_TYPE_ED
135 };
136
137 #define TYPE_DD 0
138 #define TYPE_HD 1
139 #define TYPE_ED 2
140
141 static int DriveType = TYPE_HD;
142
143 static DEFINE_SPINLOCK(ataflop_lock);
144
145 /* Array for translating minors into disk formats */
146 static struct {
147 int index;
148 unsigned drive_types;
149 } minor2disktype[] = {
150 { 0, TYPE_DD }, /* 1: d360 */
151 { 4, TYPE_HD }, /* 2: h1200 */
152 { 1, TYPE_DD }, /* 3: D360 */
153 { 2, TYPE_DD }, /* 4: D720 */
154 { 1, TYPE_DD }, /* 5: h360 = D360 */
155 { 2, TYPE_DD }, /* 6: h720 = D720 */
156 { 5, TYPE_HD }, /* 7: H1440 */
157 { 7, TYPE_ED }, /* 8: E2880 */
158 /* some PC formats :-) */
159 { 8, TYPE_ED }, /* 9: E3280 <- was "CompaQ" == E2880 for PC */
160 { 5, TYPE_HD }, /* 10: h1440 = H1440 */
161 { 9, TYPE_HD }, /* 11: H1680 */
162 { 10, TYPE_DD }, /* 12: h410 */
163 { 3, TYPE_DD }, /* 13: H820 <- == D820, 82x10 */
164 { 11, TYPE_HD }, /* 14: h1476 */
165 { 12, TYPE_HD }, /* 15: H1722 */
166 { 13, TYPE_DD }, /* 16: h420 */
167 { 14, TYPE_DD }, /* 17: H830 */
168 { 15, TYPE_HD }, /* 18: h1494 */
169 { 16, TYPE_HD }, /* 19: H1743 */
170 { 17, TYPE_DD }, /* 20: h880 */
171 { 18, TYPE_DD }, /* 21: D1040 */
172 { 19, TYPE_DD }, /* 22: D1120 */
173 { 20, TYPE_HD }, /* 23: h1600 */
174 { 21, TYPE_HD }, /* 24: H1760 */
175 { 22, TYPE_HD }, /* 25: H1920 */
176 { 23, TYPE_ED }, /* 26: E3200 */
177 { 24, TYPE_ED }, /* 27: E3520 */
178 { 25, TYPE_ED }, /* 28: E3840 */
179 { 26, TYPE_HD }, /* 29: H1840 */
180 { 27, TYPE_DD }, /* 30: D800 */
181 { 6, TYPE_HD }, /* 31: H1640 <- was H1600 == h1600 for PC */
182 };
183
184 #define NUM_DISK_MINORS (sizeof(minor2disktype)/sizeof(*minor2disktype))
185
186 /*
187 * Maximum disk size (in kilobytes). This default is used whenever the
188 * current disk size is unknown.
189 */
190 #define MAX_DISK_SIZE 3280
191
192 /*
193 * MSch: User-provided type information. 'drive' points to
194 * the respective entry of this array. Set by FDSETPRM ioctls.
195 */
196 static struct atari_disk_type user_params[FD_MAX_UNITS];
197
198 /*
199 * User-provided permanent type information. 'drive' points to
200 * the respective entry of this array. Set by FDDEFPRM ioctls,
201 * restored upon disk change by floppy_revalidate() if valid (as seen by
202 * default_params[].blocks > 0 - a bit in unit[].flags might be used for this?)
203 */
204 static struct atari_disk_type default_params[FD_MAX_UNITS];
205
206 /* current info on each unit */
207 static struct atari_floppy_struct {
208 int connected; /* !=0 : drive is connected */
209 int autoprobe; /* !=0 : do autoprobe */
210
211 struct atari_disk_type *disktype; /* current type of disk */
212
213 int track; /* current head position or -1 if
214 unknown */
215 unsigned int steprate; /* steprate setting */
216 unsigned int wpstat; /* current state of WP signal (for
217 disk change detection) */
218 int flags; /* flags */
219 struct gendisk *disk;
220 int ref;
221 int type;
222 } unit[FD_MAX_UNITS];
223
224 #define UD unit[drive]
225 #define UDT unit[drive].disktype
226 #define SUD unit[SelectedDrive]
227 #define SUDT unit[SelectedDrive].disktype
228
229
230 #define FDC_READ(reg) ({ \
231 /* unsigned long __flags; */ \
232 unsigned short __val; \
233 /* local_irq_save(__flags); */ \
234 dma_wd.dma_mode_status = 0x80 | (reg); \
235 udelay(25); \
236 __val = dma_wd.fdc_acces_seccount; \
237 MFPDELAY(); \
238 /* local_irq_restore(__flags); */ \
239 __val & 0xff; \
240 })
241
242 #define FDC_WRITE(reg,val) \
243 do { \
244 /* unsigned long __flags; */ \
245 /* local_irq_save(__flags); */ \
246 dma_wd.dma_mode_status = 0x80 | (reg); \
247 udelay(25); \
248 dma_wd.fdc_acces_seccount = (val); \
249 MFPDELAY(); \
250 /* local_irq_restore(__flags); */ \
251 } while(0)
252
253
254 /* Buffering variables:
255 * First, there is a DMA buffer in ST-RAM that is used for floppy DMA
256 * operations. Second, a track buffer is used to cache a whole track
257 * of the disk to save read operations. These are two separate buffers
258 * because that allows write operations without clearing the track buffer.
259 */
260
261 static int MaxSectors[] = {
262 11, 22, 44
263 };
264 static int BufferSize[] = {
265 15*512, 30*512, 60*512
266 };
267
268 #define BUFFER_SIZE (BufferSize[DriveType])
269
270 unsigned char *DMABuffer; /* buffer for writes */
271 static unsigned long PhysDMABuffer; /* physical address */
272
273 static int UseTrackbuffer = -1; /* Do track buffering? */
274 MODULE_PARM(UseTrackbuffer, "i");
275
276 unsigned char *TrackBuffer; /* buffer for reads */
277 static unsigned long PhysTrackBuffer; /* physical address */
278 static int BufferDrive, BufferSide, BufferTrack;
279 static int read_track; /* non-zero if we are reading whole tracks */
280
281 #define SECTOR_BUFFER(sec) (TrackBuffer + ((sec)-1)*512)
282 #define IS_BUFFERED(drive,side,track) \
283 (BufferDrive == (drive) && BufferSide == (side) && BufferTrack == (track))
284
285 /*
286 * These are global variables, as that's the easiest way to give
287 * information to interrupts. They are the data used for the current
288 * request.
289 */
290 static int SelectedDrive = 0;
291 static int ReqCmd, ReqBlock;
292 static int ReqSide, ReqTrack, ReqSector, ReqCnt;
293 static int HeadSettleFlag = 0;
294 static unsigned char *ReqData, *ReqBuffer;
295 static int MotorOn = 0, MotorOffTrys;
296 static int IsFormatting = 0, FormatError;
297
298 static int UserSteprate[FD_MAX_UNITS] = { -1, -1 };
299 MODULE_PARM(UserSteprate, "1-" __MODULE_STRING(FD_MAX_UNITS) "i");
300
301 /* Synchronization of FDC access. */
302 static volatile int fdc_busy = 0;
303 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
304 static DECLARE_WAIT_QUEUE_HEAD(format_wait);
305
306 static unsigned long changed_floppies = 0xff, fake_change = 0;
307 #define CHECK_CHANGE_DELAY HZ/2
308
309 #define FD_MOTOR_OFF_DELAY (3*HZ)
310 #define FD_MOTOR_OFF_MAXTRY (10*20)
311
312 #define FLOPPY_TIMEOUT (6*HZ)
313 #define RECALIBRATE_ERRORS 4 /* After this many errors the drive
314 * will be recalibrated. */
315 #define MAX_ERRORS 8 /* After this many errors the driver
316 * will give up. */
317
318
319 /*
320 * The driver is trying to determine the correct media format
321 * while Probing is set. fd_rwsec_done() clears it after a
322 * successful access.
323 */
324 static int Probing = 0;
325
326 /* This flag is set when a dummy seek is necessary to make the WP
327 * status bit accessible.
328 */
329 static int NeedSeek = 0;
330
331
332 #ifdef DEBUG
333 #define DPRINT(a) printk a
334 #else
335 #define DPRINT(a)
336 #endif
337
338 /***************************** Prototypes *****************************/
339
340 static void fd_select_side( int side );
341 static void fd_select_drive( int drive );
342 static void fd_deselect( void );
343 static void fd_motor_off_timer( unsigned long dummy );
344 static void check_change( unsigned long dummy );
345 static irqreturn_t floppy_irq (int irq, void *dummy, struct pt_regs *fp);
346 static void fd_error( void );
347 static int do_format(int drive, int type, struct atari_format_descr *desc);
348 static void do_fd_action( int drive );
349 static void fd_calibrate( void );
350 static void fd_calibrate_done( int status );
351 static void fd_seek( void );
352 static void fd_seek_done( int status );
353 static void fd_rwsec( void );
354 static void fd_readtrack_check( unsigned long dummy );
355 static void fd_rwsec_done( int status );
356 static void fd_rwsec_done1(int status);
357 static void fd_writetrack( void );
358 static void fd_writetrack_done( int status );
359 static void fd_times_out( unsigned long dummy );
360 static void finish_fdc( void );
361 static void finish_fdc_done( int dummy );
362 static void setup_req_params( int drive );
363 static void redo_fd_request( void);
364 static int fd_ioctl( struct inode *inode, struct file *filp, unsigned int
365 cmd, unsigned long param);
366 static void fd_probe( int drive );
367 static int fd_test_drive_present( int drive );
368 static void config_types( void );
369 static int floppy_open( struct inode *inode, struct file *filp );
370 static int floppy_release( struct inode * inode, struct file * filp );
371
372 /************************* End of Prototypes **************************/
373
374 static struct timer_list motor_off_timer =
375 TIMER_INITIALIZER(fd_motor_off_timer, 0, 0);
376 static struct timer_list readtrack_timer =
377 TIMER_INITIALIZER(fd_readtrack_check, 0, 0);
378
379 static struct timer_list timeout_timer =
380 TIMER_INITIALIZER(fd_times_out, 0, 0);
381
382 static struct timer_list fd_timer =
383 TIMER_INITIALIZER(check_change, 0, 0);
384
385 static inline void start_motor_off_timer(void)
386 {
387 mod_timer(&motor_off_timer, jiffies + FD_MOTOR_OFF_DELAY);
388 MotorOffTrys = 0;
389 }
390
391 static inline void start_check_change_timer( void )
392 {
393 mod_timer(&fd_timer, jiffies + CHECK_CHANGE_DELAY);
394 }
395
396 static inline void start_timeout(void)
397 {
398 mod_timer(&timeout_timer, jiffies + FLOPPY_TIMEOUT);
399 }
400
401 static inline void stop_timeout(void)
402 {
403 del_timer(&timeout_timer);
404 }
405
406 /* Select the side to use. */
407
408 static void fd_select_side( int side )
409 {
410 unsigned long flags;
411
412 /* protect against various other ints mucking around with the PSG */
413 local_irq_save(flags);
414
415 sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */
416 sound_ym.wd_data = (side == 0) ? sound_ym.rd_data_reg_sel | 0x01 :
417 sound_ym.rd_data_reg_sel & 0xfe;
418
419 local_irq_restore(flags);
420 }
421
422
423 /* Select a drive, update the FDC's track register and set the correct
424 * clock speed for this disk's type.
425 */
426
427 static void fd_select_drive( int drive )
428 {
429 unsigned long flags;
430 unsigned char tmp;
431
432 if (drive == SelectedDrive)
433 return;
434
435 /* protect against various other ints mucking around with the PSG */
436 local_irq_save(flags);
437 sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */
438 tmp = sound_ym.rd_data_reg_sel;
439 sound_ym.wd_data = (tmp | DSKDRVNONE) & ~(drive == 0 ? DSKDRV0 : DSKDRV1);
440 atari_dont_touch_floppy_select = 1;
441 local_irq_restore(flags);
442
443 /* restore track register to saved value */
444 FDC_WRITE( FDCREG_TRACK, UD.track );
445 udelay(25);
446
447 /* select 8/16 MHz */
448 if (UDT)
449 if (ATARIHW_PRESENT(FDCSPEED))
450 dma_wd.fdc_speed = UDT->fdc_speed;
451
452 SelectedDrive = drive;
453 }
454
455
456 /* Deselect both drives. */
457
458 static void fd_deselect( void )
459 {
460 unsigned long flags;
461
462 /* protect against various other ints mucking around with the PSG */
463 local_irq_save(flags);
464 atari_dont_touch_floppy_select = 0;
465 sound_ym.rd_data_reg_sel=14; /* Select PSG Port A */
466 sound_ym.wd_data = (sound_ym.rd_data_reg_sel |
467 (MACH_IS_FALCON ? 3 : 7)); /* no drives selected */
468 /* On Falcon, the drive B select line is used on the printer port, so
469 * leave it alone... */
470 SelectedDrive = -1;
471 local_irq_restore(flags);
472 }
473
474
475 /* This timer function deselects the drives when the FDC switched the
476 * motor off. The deselection cannot happen earlier because the FDC
477 * counts the index signals, which arrive only if one drive is selected.
478 */
479
480 static void fd_motor_off_timer( unsigned long dummy )
481 {
482 unsigned char status;
483
484 if (SelectedDrive < 0)
485 /* no drive selected, needn't deselect anyone */
486 return;
487
488 if (stdma_islocked())
489 goto retry;
490
491 status = FDC_READ( FDCREG_STATUS );
492
493 if (!(status & 0x80)) {
494 /* motor already turned off by FDC -> deselect drives */
495 MotorOn = 0;
496 fd_deselect();
497 return;
498 }
499 /* not yet off, try again */
500
501 retry:
502 /* Test again later; if tested too often, it seems there is no disk
503 * in the drive and the FDC will leave the motor on forever (or,
504 * at least until a disk is inserted). So we'll test only twice
505 * per second from then on...
506 */
507 mod_timer(&motor_off_timer,
508 jiffies + (MotorOffTrys++ < FD_MOTOR_OFF_MAXTRY ? HZ/20 : HZ/2));
509 }
510
511
512 /* This function is repeatedly called to detect disk changes (as good
513 * as possible) and keep track of the current state of the write protection.
514 */
515
516 static void check_change( unsigned long dummy )
517 {
518 static int drive = 0;
519
520 unsigned long flags;
521 unsigned char old_porta;
522 int stat;
523
524 if (++drive > 1 || !UD.connected)
525 drive = 0;
526
527 /* protect against various other ints mucking around with the PSG */
528 local_irq_save(flags);
529
530 if (!stdma_islocked()) {
531 sound_ym.rd_data_reg_sel = 14;
532 old_porta = sound_ym.rd_data_reg_sel;
533 sound_ym.wd_data = (old_porta | DSKDRVNONE) &
534 ~(drive == 0 ? DSKDRV0 : DSKDRV1);
535 stat = !!(FDC_READ( FDCREG_STATUS ) & FDCSTAT_WPROT);
536 sound_ym.wd_data = old_porta;
537
538 if (stat != UD.wpstat) {
539 DPRINT(( "wpstat[%d] = %d\n", drive, stat ));
540 UD.wpstat = stat;
541 set_bit (drive, &changed_floppies);
542 }
543 }
544 local_irq_restore(flags);
545
546 start_check_change_timer();
547 }
548
549
550 /* Handling of the Head Settling Flag: This flag should be set after each
551 * seek operation, because we don't use seeks with verify.
552 */
553
554 static inline void set_head_settle_flag(void)
555 {
556 HeadSettleFlag = FDCCMDADD_E;
557 }
558
559 static inline int get_head_settle_flag(void)
560 {
561 int tmp = HeadSettleFlag;
562 HeadSettleFlag = 0;
563 return( tmp );
564 }
565
566 static inline void copy_buffer(void *from, void *to)
567 {
568 ulong *p1 = (ulong *)from, *p2 = (ulong *)to;
569 int cnt;
570
571 for (cnt = 512/4; cnt; cnt--)
572 *p2++ = *p1++;
573 }
574
575
576
577
578 /* General Interrupt Handling */
579
580 static void (*FloppyIRQHandler)( int status ) = NULL;
581
582 static irqreturn_t floppy_irq (int irq, void *dummy, struct pt_regs *fp)
583 {
584 unsigned char status;
585 void (*handler)( int );
586
587 handler = xchg(&FloppyIRQHandler, NULL);
588
589 if (handler) {
590 nop();
591 status = FDC_READ( FDCREG_STATUS );
592 DPRINT(("FDC irq, status = %02x handler = %08lx\n",status,(unsigned long)handler));
593 handler( status );
594 }
595 else {
596 DPRINT(("FDC irq, no handler\n"));
597 }
598 return IRQ_HANDLED;
599 }
600
601
602 /* Error handling: If some error happened, retry some times, then
603 * recalibrate, then try again, and fail after MAX_ERRORS.
604 */
605
606 static void fd_error( void )
607 {
608 if (IsFormatting) {
609 IsFormatting = 0;
610 FormatError = 1;
611 wake_up( &format_wait );
612 return;
613 }
614
615 if (!CURRENT)
616 return;
617
618 CURRENT->errors++;
619 if (CURRENT->errors >= MAX_ERRORS) {
620 printk(KERN_ERR "fd%d: too many errors.\n", SelectedDrive );
621 end_request(CURRENT, 0);
622 }
623 else if (CURRENT->errors == RECALIBRATE_ERRORS) {
624 printk(KERN_WARNING "fd%d: recalibrating\n", SelectedDrive );
625 if (SelectedDrive != -1)
626 SUD.track = -1;
627 }
628 redo_fd_request();
629 }
630
631
632
633 #define SET_IRQ_HANDLER(proc) do { FloppyIRQHandler = (proc); } while(0)
634
635
636 /* ---------- Formatting ---------- */
637
638 #define FILL(n,val) \
639 do { \
640 memset( p, val, n ); \
641 p += n; \
642 } while(0)
643
644 static int do_format(int drive, int type, struct atari_format_descr *desc)
645 {
646 unsigned char *p;
647 int sect, nsect;
648 unsigned long flags;
649
650 DPRINT(("do_format( dr=%d tr=%d he=%d offs=%d )\n",
651 drive, desc->track, desc->head, desc->sect_offset ));
652
653 local_irq_save(flags);
654 while( fdc_busy ) sleep_on( &fdc_wait );
655 fdc_busy = 1;
656 stdma_lock(floppy_irq, NULL);
657 atari_turnon_irq( IRQ_MFP_FDC ); /* should be already, just to be sure */
658 local_irq_restore(flags);
659
660 if (type) {
661 if (--type >= NUM_DISK_MINORS ||
662 minor2disktype[type].drive_types > DriveType) {
663 redo_fd_request();
664 return -EINVAL;
665 }
666 type = minor2disktype[type].index;
667 UDT = &disk_type[type];
668 }
669
670 if (!UDT || desc->track >= UDT->blocks/UDT->spt/2 || desc->head >= 2) {
671 redo_fd_request();
672 return -EINVAL;
673 }
674
675 nsect = UDT->spt;
676 p = TrackBuffer;
677 /* The track buffer is used for the raw track data, so its
678 contents become invalid! */
679 BufferDrive = -1;
680 /* stop deselect timer */
681 del_timer( &motor_off_timer );
682
683 FILL( 60 * (nsect / 9), 0x4e );
684 for( sect = 0; sect < nsect; ++sect ) {
685 FILL( 12, 0 );
686 FILL( 3, 0xf5 );
687 *p++ = 0xfe;
688 *p++ = desc->track;
689 *p++ = desc->head;
690 *p++ = (nsect + sect - desc->sect_offset) % nsect + 1;
691 *p++ = 2;
692 *p++ = 0xf7;
693 FILL( 22, 0x4e );
694 FILL( 12, 0 );
695 FILL( 3, 0xf5 );
696 *p++ = 0xfb;
697 FILL( 512, 0xe5 );
698 *p++ = 0xf7;
699 FILL( 40, 0x4e );
700 }
701 FILL( TrackBuffer+BUFFER_SIZE-p, 0x4e );
702
703 IsFormatting = 1;
704 FormatError = 0;
705 ReqTrack = desc->track;
706 ReqSide = desc->head;
707 do_fd_action( drive );
708
709 sleep_on( &format_wait );
710
711 redo_fd_request();
712 return( FormatError ? -EIO : 0 );
713 }
714
715
716 /* do_fd_action() is the general procedure for a fd request: All
717 * required parameter settings (drive select, side select, track
718 * position) are checked and set if needed. For each of these
719 * parameters and the actual reading or writing exist two functions:
720 * one that starts the setting (or skips it if possible) and one
721 * callback for the "done" interrupt. Each done func calls the next
722 * set function to propagate the request down to fd_rwsec_done().
723 */
724
725 static void do_fd_action( int drive )
726 {
727 DPRINT(("do_fd_action\n"));
728
729 if (UseTrackbuffer && !IsFormatting) {
730 repeat:
731 if (IS_BUFFERED( drive, ReqSide, ReqTrack )) {
732 if (ReqCmd == READ) {
733 copy_buffer( SECTOR_BUFFER(ReqSector), ReqData );
734 if (++ReqCnt < CURRENT->current_nr_sectors) {
735 /* read next sector */
736 setup_req_params( drive );
737 goto repeat;
738 }
739 else {
740 /* all sectors finished */
741 CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
742 CURRENT->sector += CURRENT->current_nr_sectors;
743 end_request(CURRENT, 1);
744 redo_fd_request();
745 return;
746 }
747 }
748 else {
749 /* cmd == WRITE, pay attention to track buffer
750 * consistency! */
751 copy_buffer( ReqData, SECTOR_BUFFER(ReqSector) );
752 }
753 }
754 }
755
756 if (SelectedDrive != drive)
757 fd_select_drive( drive );
758
759 if (UD.track == -1)
760 fd_calibrate();
761 else if (UD.track != ReqTrack << UDT->stretch)
762 fd_seek();
763 else if (IsFormatting)
764 fd_writetrack();
765 else
766 fd_rwsec();
767 }
768
769
770 /* Seek to track 0 if the current track is unknown */
771
772 static void fd_calibrate( void )
773 {
774 if (SUD.track >= 0) {
775 fd_calibrate_done( 0 );
776 return;
777 }
778
779 if (ATARIHW_PRESENT(FDCSPEED))
780 dma_wd.fdc_speed = 0; /* always seek with 8 Mhz */;
781 DPRINT(("fd_calibrate\n"));
782 SET_IRQ_HANDLER( fd_calibrate_done );
783 /* we can't verify, since the speed may be incorrect */
784 FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | SUD.steprate );
785
786 NeedSeek = 1;
787 MotorOn = 1;
788 start_timeout();
789 /* wait for IRQ */
790 }
791
792
793 static void fd_calibrate_done( int status )
794 {
795 DPRINT(("fd_calibrate_done()\n"));
796 stop_timeout();
797
798 /* set the correct speed now */
799 if (ATARIHW_PRESENT(FDCSPEED))
800 dma_wd.fdc_speed = SUDT->fdc_speed;
801 if (status & FDCSTAT_RECNF) {
802 printk(KERN_ERR "fd%d: restore failed\n", SelectedDrive );
803 fd_error();
804 }
805 else {
806 SUD.track = 0;
807 fd_seek();
808 }
809 }
810
811
812 /* Seek the drive to the requested track. The drive must have been
813 * calibrated at some point before this.
814 */
815
816 static void fd_seek( void )
817 {
818 if (SUD.track == ReqTrack << SUDT->stretch) {
819 fd_seek_done( 0 );
820 return;
821 }
822
823 if (ATARIHW_PRESENT(FDCSPEED)) {
824 dma_wd.fdc_speed = 0; /* always seek witch 8 Mhz */
825 MFPDELAY();
826 }
827
828 DPRINT(("fd_seek() to track %d\n",ReqTrack));
829 FDC_WRITE( FDCREG_DATA, ReqTrack << SUDT->stretch);
830 udelay(25);
831 SET_IRQ_HANDLER( fd_seek_done );
832 FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK | SUD.steprate );
833
834 MotorOn = 1;
835 set_head_settle_flag();
836 start_timeout();
837 /* wait for IRQ */
838 }
839
840
841 static void fd_seek_done( int status )
842 {
843 DPRINT(("fd_seek_done()\n"));
844 stop_timeout();
845
846 /* set the correct speed */
847 if (ATARIHW_PRESENT(FDCSPEED))
848 dma_wd.fdc_speed = SUDT->fdc_speed;
849 if (status & FDCSTAT_RECNF) {
850 printk(KERN_ERR "fd%d: seek error (to track %d)\n",
851 SelectedDrive, ReqTrack );
852 /* we don't know exactly which track we are on now! */
853 SUD.track = -1;
854 fd_error();
855 }
856 else {
857 SUD.track = ReqTrack << SUDT->stretch;
858 NeedSeek = 0;
859 if (IsFormatting)
860 fd_writetrack();
861 else
862 fd_rwsec();
863 }
864 }
865
866
867 /* This does the actual reading/writing after positioning the head
868 * over the correct track.
869 */
870
871 static int MultReadInProgress = 0;
872
873
874 static void fd_rwsec( void )
875 {
876 unsigned long paddr, flags;
877 unsigned int rwflag, old_motoron;
878 unsigned int track;
879
880 DPRINT(("fd_rwsec(), Sec=%d, Access=%c\n",ReqSector, ReqCmd == WRITE ? 'w' : 'r' ));
881 if (ReqCmd == WRITE) {
882 if (ATARIHW_PRESENT(EXTD_DMA)) {
883 paddr = virt_to_phys(ReqData);
884 }
885 else {
886 copy_buffer( ReqData, DMABuffer );
887 paddr = PhysDMABuffer;
888 }
889 dma_cache_maintenance( paddr, 512, 1 );
890 rwflag = 0x100;
891 }
892 else {
893 if (read_track)
894 paddr = PhysTrackBuffer;
895 else
896 paddr = ATARIHW_PRESENT(EXTD_DMA) ?
897 virt_to_phys(ReqData) : PhysDMABuffer;
898 rwflag = 0;
899 }
900
901 fd_select_side( ReqSide );
902
903 /* Start sector of this operation */
904 FDC_WRITE( FDCREG_SECTOR, read_track ? 1 : ReqSector );
905 MFPDELAY();
906 /* Cheat for track if stretch != 0 */
907 if (SUDT->stretch) {
908 track = FDC_READ( FDCREG_TRACK);
909 MFPDELAY();
910 FDC_WRITE( FDCREG_TRACK, track >> SUDT->stretch);
911 }
912 udelay(25);
913
914 /* Setup DMA */
915 local_irq_save(flags);
916 dma_wd.dma_lo = (unsigned char)paddr;
917 MFPDELAY();
918 paddr >>= 8;
919 dma_wd.dma_md = (unsigned char)paddr;
920 MFPDELAY();
921 paddr >>= 8;
922 if (ATARIHW_PRESENT(EXTD_DMA))
923 st_dma_ext_dmahi = (unsigned short)paddr;
924 else
925 dma_wd.dma_hi = (unsigned char)paddr;
926 MFPDELAY();
927 local_irq_restore(flags);
928
929 /* Clear FIFO and switch DMA to correct mode */
930 dma_wd.dma_mode_status = 0x90 | rwflag;
931 MFPDELAY();
932 dma_wd.dma_mode_status = 0x90 | (rwflag ^ 0x100);
933 MFPDELAY();
934 dma_wd.dma_mode_status = 0x90 | rwflag;
935 MFPDELAY();
936
937 /* How many sectors for DMA */
938 dma_wd.fdc_acces_seccount = read_track ? SUDT->spt : 1;
939
940 udelay(25);
941
942 /* Start operation */
943 dma_wd.dma_mode_status = FDCSELREG_STP | rwflag;
944 udelay(25);
945 SET_IRQ_HANDLER( fd_rwsec_done );
946 dma_wd.fdc_acces_seccount =
947 (get_head_settle_flag() |
948 (rwflag ? FDCCMD_WRSEC : (FDCCMD_RDSEC | (read_track ? FDCCMDADD_M : 0))));
949
950 old_motoron = MotorOn;
951 MotorOn = 1;
952 NeedSeek = 1;
953 /* wait for interrupt */
954
955 if (read_track) {
956 /* If reading a whole track, wait about one disk rotation and
957 * then check if all sectors are read. The FDC will even
958 * search for the first non-existent sector and need 1 sec to
959 * recognise that it isn't present :-(
960 */
961 MultReadInProgress = 1;
962 mod_timer(&readtrack_timer,
963 /* 1 rot. + 5 rot.s if motor was off */
964 jiffies + HZ/5 + (old_motoron ? 0 : HZ));
965 }
966 start_timeout();
967 }
968
969
970 static void fd_readtrack_check( unsigned long dummy )
971 {
972 unsigned long flags, addr, addr2;
973
974 local_irq_save(flags);
975
976 if (!MultReadInProgress) {
977 /* This prevents a race condition that could arise if the
978 * interrupt is triggered while the calling of this timer
979 * callback function takes place. The IRQ function then has
980 * already cleared 'MultReadInProgress' when flow of control
981 * gets here.
982 */
983 local_irq_restore(flags);
984 return;
985 }
986
987 /* get the current DMA address */
988 /* ++ f.a. read twice to avoid being fooled by switcher */
989 addr = 0;
990 do {
991 addr2 = addr;
992 addr = dma_wd.dma_lo & 0xff;
993 MFPDELAY();
994 addr |= (dma_wd.dma_md & 0xff) << 8;
995 MFPDELAY();
996 if (ATARIHW_PRESENT( EXTD_DMA ))
997 addr |= (st_dma_ext_dmahi & 0xffff) << 16;
998 else
999 addr |= (dma_wd.dma_hi & 0xff) << 16;
1000 MFPDELAY();
1001 } while(addr != addr2);
1002
1003 if (addr >= PhysTrackBuffer + SUDT->spt*512) {
1004 /* already read enough data, force an FDC interrupt to stop
1005 * the read operation
1006 */
1007 SET_IRQ_HANDLER( NULL );
1008 MultReadInProgress = 0;
1009 local_irq_restore(flags);
1010 DPRINT(("fd_readtrack_check(): done\n"));
1011 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1012 udelay(25);
1013
1014 /* No error until now -- the FDC would have interrupted
1015 * otherwise!
1016 */
1017 fd_rwsec_done1(0);
1018 }
1019 else {
1020 /* not yet finished, wait another tenth rotation */
1021 local_irq_restore(flags);
1022 DPRINT(("fd_readtrack_check(): not yet finished\n"));
1023 mod_timer(&readtrack_timer, jiffies + HZ/5/10);
1024 }
1025 }
1026
1027
1028 static void fd_rwsec_done( int status )
1029 {
1030 DPRINT(("fd_rwsec_done()\n"));
1031
1032 if (read_track) {
1033 del_timer(&readtrack_timer);
1034 if (!MultReadInProgress)
1035 return;
1036 MultReadInProgress = 0;
1037 }
1038 fd_rwsec_done1(status);
1039 }
1040
1041 static void fd_rwsec_done1(int status)
1042 {
1043 unsigned int track;
1044
1045 stop_timeout();
1046
1047 /* Correct the track if stretch != 0 */
1048 if (SUDT->stretch) {
1049 track = FDC_READ( FDCREG_TRACK);
1050 MFPDELAY();
1051 FDC_WRITE( FDCREG_TRACK, track << SUDT->stretch);
1052 }
1053
1054 if (!UseTrackbuffer) {
1055 dma_wd.dma_mode_status = 0x90;
1056 MFPDELAY();
1057 if (!(dma_wd.dma_mode_status & 0x01)) {
1058 printk(KERN_ERR "fd%d: DMA error\n", SelectedDrive );
1059 goto err_end;
1060 }
1061 }
1062 MFPDELAY();
1063
1064 if (ReqCmd == WRITE && (status & FDCSTAT_WPROT)) {
1065 printk(KERN_NOTICE "fd%d: is write protected\n", SelectedDrive );
1066 goto err_end;
1067 }
1068 if ((status & FDCSTAT_RECNF) &&
1069 /* RECNF is no error after a multiple read when the FDC
1070 searched for a non-existent sector! */
1071 !(read_track && FDC_READ(FDCREG_SECTOR) > SUDT->spt)) {
1072 if (Probing) {
1073 if (SUDT > disk_type) {
1074 if (SUDT[-1].blocks > ReqBlock) {
1075 /* try another disk type */
1076 SUDT--;
1077 set_capacity(unit[SelectedDrive].disk,
1078 SUDT->blocks);
1079 } else
1080 Probing = 0;
1081 }
1082 else {
1083 if (SUD.flags & FTD_MSG)
1084 printk(KERN_INFO "fd%d: Auto-detected floppy type %s\n",
1085 SelectedDrive, SUDT->name );
1086 Probing=0;
1087 }
1088 } else {
1089 /* record not found, but not probing. Maybe stretch wrong ? Restart probing */
1090 if (SUD.autoprobe) {
1091 SUDT = disk_type + StartDiskType[DriveType];
1092 set_capacity(unit[SelectedDrive].disk,
1093 SUDT->blocks);
1094 Probing = 1;
1095 }
1096 }
1097 if (Probing) {
1098 if (ATARIHW_PRESENT(FDCSPEED)) {
1099 dma_wd.fdc_speed = SUDT->fdc_speed;
1100 MFPDELAY();
1101 }
1102 setup_req_params( SelectedDrive );
1103 BufferDrive = -1;
1104 do_fd_action( SelectedDrive );
1105 return;
1106 }
1107
1108 printk(KERN_ERR "fd%d: sector %d not found (side %d, track %d)\n",
1109 SelectedDrive, FDC_READ (FDCREG_SECTOR), ReqSide, ReqTrack );
1110 goto err_end;
1111 }
1112 if (status & FDCSTAT_CRC) {
1113 printk(KERN_ERR "fd%d: CRC error (side %d, track %d, sector %d)\n",
1114 SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) );
1115 goto err_end;
1116 }
1117 if (status & FDCSTAT_LOST) {
1118 printk(KERN_ERR "fd%d: lost data (side %d, track %d, sector %d)\n",
1119 SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) );
1120 goto err_end;
1121 }
1122
1123 Probing = 0;
1124
1125 if (ReqCmd == READ) {
1126 if (!read_track) {
1127 void *addr;
1128 addr = ATARIHW_PRESENT( EXTD_DMA ) ? ReqData : DMABuffer;
1129 dma_cache_maintenance( virt_to_phys(addr), 512, 0 );
1130 if (!ATARIHW_PRESENT( EXTD_DMA ))
1131 copy_buffer (addr, ReqData);
1132 } else {
1133 dma_cache_maintenance( PhysTrackBuffer, MaxSectors[DriveType] * 512, 0 );
1134 BufferDrive = SelectedDrive;
1135 BufferSide = ReqSide;
1136 BufferTrack = ReqTrack;
1137 copy_buffer (SECTOR_BUFFER (ReqSector), ReqData);
1138 }
1139 }
1140
1141 if (++ReqCnt < CURRENT->current_nr_sectors) {
1142 /* read next sector */
1143 setup_req_params( SelectedDrive );
1144 do_fd_action( SelectedDrive );
1145 }
1146 else {
1147 /* all sectors finished */
1148 CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
1149 CURRENT->sector += CURRENT->current_nr_sectors;
1150 end_request(CURRENT, 1);
1151 redo_fd_request();
1152 }
1153 return;
1154
1155 err_end:
1156 BufferDrive = -1;
1157 fd_error();
1158 }
1159
1160
1161 static void fd_writetrack( void )
1162 {
1163 unsigned long paddr, flags;
1164 unsigned int track;
1165
1166 DPRINT(("fd_writetrack() Tr=%d Si=%d\n", ReqTrack, ReqSide ));
1167
1168 paddr = PhysTrackBuffer;
1169 dma_cache_maintenance( paddr, BUFFER_SIZE, 1 );
1170
1171 fd_select_side( ReqSide );
1172
1173 /* Cheat for track if stretch != 0 */
1174 if (SUDT->stretch) {
1175 track = FDC_READ( FDCREG_TRACK);
1176 MFPDELAY();
1177 FDC_WRITE(FDCREG_TRACK,track >> SUDT->stretch);
1178 }
1179 udelay(40);
1180
1181 /* Setup DMA */
1182 local_irq_save(flags);
1183 dma_wd.dma_lo = (unsigned char)paddr;
1184 MFPDELAY();
1185 paddr >>= 8;
1186 dma_wd.dma_md = (unsigned char)paddr;
1187 MFPDELAY();
1188 paddr >>= 8;
1189 if (ATARIHW_PRESENT( EXTD_DMA ))
1190 st_dma_ext_dmahi = (unsigned short)paddr;
1191 else
1192 dma_wd.dma_hi = (unsigned char)paddr;
1193 MFPDELAY();
1194 local_irq_restore(flags);
1195
1196 /* Clear FIFO and switch DMA to correct mode */
1197 dma_wd.dma_mode_status = 0x190;
1198 MFPDELAY();
1199 dma_wd.dma_mode_status = 0x90;
1200 MFPDELAY();
1201 dma_wd.dma_mode_status = 0x190;
1202 MFPDELAY();
1203
1204 /* How many sectors for DMA */
1205 dma_wd.fdc_acces_seccount = BUFFER_SIZE/512;
1206 udelay(40);
1207
1208 /* Start operation */
1209 dma_wd.dma_mode_status = FDCSELREG_STP | 0x100;
1210 udelay(40);
1211 SET_IRQ_HANDLER( fd_writetrack_done );
1212 dma_wd.fdc_acces_seccount = FDCCMD_WRTRA | get_head_settle_flag();
1213
1214 MotorOn = 1;
1215 start_timeout();
1216 /* wait for interrupt */
1217 }
1218
1219
1220 static void fd_writetrack_done( int status )
1221 {
1222 DPRINT(("fd_writetrack_done()\n"));
1223
1224 stop_timeout();
1225
1226 if (status & FDCSTAT_WPROT) {
1227 printk(KERN_NOTICE "fd%d: is write protected\n", SelectedDrive );
1228 goto err_end;
1229 }
1230 if (status & FDCSTAT_LOST) {
1231 printk(KERN_ERR "fd%d: lost data (side %d, track %d)\n",
1232 SelectedDrive, ReqSide, ReqTrack );
1233 goto err_end;
1234 }
1235
1236 wake_up( &format_wait );
1237 return;
1238
1239 err_end:
1240 fd_error();
1241 }
1242
1243 static void fd_times_out( unsigned long dummy )
1244 {
1245 atari_disable_irq( IRQ_MFP_FDC );
1246 if (!FloppyIRQHandler) goto end; /* int occurred after timer was fired, but
1247 * before we came here... */
1248
1249 SET_IRQ_HANDLER( NULL );
1250 /* If the timeout occurred while the readtrack_check timer was
1251 * active, we need to cancel it, else bad things will happen */
1252 if (UseTrackbuffer)
1253 del_timer( &readtrack_timer );
1254 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1255 udelay( 25 );
1256
1257 printk(KERN_ERR "floppy timeout\n" );
1258 fd_error();
1259 end:
1260 atari_enable_irq( IRQ_MFP_FDC );
1261 }
1262
1263
1264 /* The (noop) seek operation here is needed to make the WP bit in the
1265 * FDC status register accessible for check_change. If the last disk
1266 * operation would have been a RDSEC, this bit would always read as 0
1267 * no matter what :-( To save time, the seek goes to the track we're
1268 * already on.
1269 */
1270
1271 static void finish_fdc( void )
1272 {
1273 if (!NeedSeek) {
1274 finish_fdc_done( 0 );
1275 }
1276 else {
1277 DPRINT(("finish_fdc: dummy seek started\n"));
1278 FDC_WRITE (FDCREG_DATA, SUD.track);
1279 SET_IRQ_HANDLER( finish_fdc_done );
1280 FDC_WRITE (FDCREG_CMD, FDCCMD_SEEK);
1281 MotorOn = 1;
1282 start_timeout();
1283 /* we must wait for the IRQ here, because the ST-DMA
1284 is released immediately afterwards and the interrupt
1285 may be delivered to the wrong driver. */
1286 }
1287 }
1288
1289
1290 static void finish_fdc_done( int dummy )
1291 {
1292 unsigned long flags;
1293
1294 DPRINT(("finish_fdc_done entered\n"));
1295 stop_timeout();
1296 NeedSeek = 0;
1297
1298 if (timer_pending(&fd_timer) && time_before(fd_timer.expires, jiffies + 5))
1299 /* If the check for a disk change is done too early after this
1300 * last seek command, the WP bit still reads wrong :-((
1301 */
1302 mod_timer(&fd_timer, jiffies + 5);
1303 else
1304 start_check_change_timer();
1305 start_motor_off_timer();
1306
1307 local_irq_save(flags);
1308 stdma_release();
1309 fdc_busy = 0;
1310 wake_up( &fdc_wait );
1311 local_irq_restore(flags);
1312
1313 DPRINT(("finish_fdc() finished\n"));
1314 }
1315
1316 /* The detection of disk changes is a dark chapter in Atari history :-(
1317 * Because the "Drive ready" signal isn't present in the Atari
1318 * hardware, one has to rely on the "Write Protect". This works fine,
1319 * as long as no write protected disks are used. TOS solves this
1320 * problem by introducing tri-state logic ("maybe changed") and
1321 * looking at the serial number in block 0. This isn't possible for
1322 * Linux, since the floppy driver can't make assumptions about the
1323 * filesystem used on the disk and thus the contents of block 0. I've
1324 * chosen the method to always say "The disk was changed" if it is
1325 * unsure whether it was. This implies that every open or mount
1326 * invalidates the disk buffers if you work with write protected
1327 * disks. But at least this is better than working with incorrect data
1328 * due to unrecognised disk changes.
1329 */
1330
1331 static int check_floppy_change(struct gendisk *disk)
1332 {
1333 struct atari_floppy_struct *p = disk->private_data;
1334 unsigned int drive = p - unit;
1335 if (test_bit (drive, &fake_change)) {
1336 /* simulated change (e.g. after formatting) */
1337 return 1;
1338 }
1339 if (test_bit (drive, &changed_floppies)) {
1340 /* surely changed (the WP signal changed at least once) */
1341 return 1;
1342 }
1343 if (UD.wpstat) {
1344 /* WP is on -> could be changed: to be sure, buffers should be
1345 * invalidated...
1346 */
1347 return 1;
1348 }
1349
1350 return 0;
1351 }
1352
1353 static int floppy_revalidate(struct gendisk *disk)
1354 {
1355 struct atari_floppy_struct *p = disk->private_data;
1356 unsigned int drive = p - unit;
1357
1358 if (test_bit(drive, &changed_floppies) ||
1359 test_bit(drive, &fake_change) ||
1360 p->disktype == 0) {
1361 if (UD.flags & FTD_MSG)
1362 printk(KERN_ERR "floppy: clear format %p!\n", UDT);
1363 BufferDrive = -1;
1364 clear_bit(drive, &fake_change);
1365 clear_bit(drive, &changed_floppies);
1366 /* MSch: clearing geometry makes sense only for autoprobe
1367 formats, for 'permanent user-defined' parameter:
1368 restore default_params[] here if flagged valid! */
1369 if (default_params[drive].blocks == 0)
1370 UDT = 0;
1371 else
1372 UDT = &default_params[drive];
1373 }
1374 return 0;
1375 }
1376
1377
1378 /* This sets up the global variables describing the current request. */
1379
1380 static void setup_req_params( int drive )
1381 {
1382 int block = ReqBlock + ReqCnt;
1383
1384 ReqTrack = block / UDT->spt;
1385 ReqSector = block - ReqTrack * UDT->spt + 1;
1386 ReqSide = ReqTrack & 1;
1387 ReqTrack >>= 1;
1388 ReqData = ReqBuffer + 512 * ReqCnt;
1389
1390 if (UseTrackbuffer)
1391 read_track = (ReqCmd == READ && CURRENT->errors == 0);
1392 else
1393 read_track = 0;
1394
1395 DPRINT(("Request params: Si=%d Tr=%d Se=%d Data=%08lx\n",ReqSide,
1396 ReqTrack, ReqSector, (unsigned long)ReqData ));
1397 }
1398
1399
1400 static void redo_fd_request(void)
1401 {
1402 int drive, type;
1403 struct atari_floppy_struct *floppy;
1404
1405 DPRINT(("redo_fd_request: CURRENT=%p dev=%s CURRENT->sector=%ld\n",
1406 CURRENT, CURRENT ? CURRENT->rq_disk->disk_name : "",
1407 CURRENT ? CURRENT->sector : 0 ));
1408
1409 IsFormatting = 0;
1410
1411 repeat:
1412
1413 if (!CURRENT)
1414 goto the_end;
1415
1416 floppy = CURRENT->rq_disk->private_data;
1417 drive = floppy - unit;
1418 type = floppy->type;
1419
1420 if (!UD.connected) {
1421 /* drive not connected */
1422 printk(KERN_ERR "Unknown Device: fd%d\n", drive );
1423 end_request(CURRENT, 0);
1424 goto repeat;
1425 }
1426
1427 if (type == 0) {
1428 if (!UDT) {
1429 Probing = 1;
1430 UDT = disk_type + StartDiskType[DriveType];
1431 set_capacity(floppy->disk, UDT->blocks);
1432 UD.autoprobe = 1;
1433 }
1434 }
1435 else {
1436 /* user supplied disk type */
1437 if (--type >= NUM_DISK_MINORS) {
1438 printk(KERN_WARNING "fd%d: invalid disk format", drive );
1439 end_request(CURRENT, 0);
1440 goto repeat;
1441 }
1442 if (minor2disktype[type].drive_types > DriveType) {
1443 printk(KERN_WARNING "fd%d: unsupported disk format", drive );
1444 end_request(CURRENT, 0);
1445 goto repeat;
1446 }
1447 type = minor2disktype[type].index;
1448 UDT = &disk_type[type];
1449 set_capacity(floppy->disk, UDT->blocks);
1450 UD.autoprobe = 0;
1451 }
1452
1453 if (CURRENT->sector + 1 > UDT->blocks) {
1454 end_request(CURRENT, 0);
1455 goto repeat;
1456 }
1457
1458 /* stop deselect timer */
1459 del_timer( &motor_off_timer );
1460
1461 ReqCnt = 0;
1462 ReqCmd = rq_data_dir(CURRENT);
1463 ReqBlock = CURRENT->sector;
1464 ReqBuffer = CURRENT->buffer;
1465 setup_req_params( drive );
1466 do_fd_action( drive );
1467
1468 return;
1469
1470 the_end:
1471 finish_fdc();
1472 }
1473
1474
1475 void do_fd_request(request_queue_t * q)
1476 {
1477 unsigned long flags;
1478
1479 DPRINT(("do_fd_request for pid %d\n",current->pid));
1480 while( fdc_busy ) sleep_on( &fdc_wait );
1481 fdc_busy = 1;
1482 stdma_lock(floppy_irq, NULL);
1483
1484 atari_disable_irq( IRQ_MFP_FDC );
1485 local_save_flags(flags); /* The request function is called with ints
1486 local_irq_disable(); * disabled... so must save the IPL for later */
1487 redo_fd_request();
1488 local_irq_restore(flags);
1489 atari_enable_irq( IRQ_MFP_FDC );
1490 }
1491
1492 static int fd_ioctl(struct inode *inode, struct file *filp,
1493 unsigned int cmd, unsigned long param)
1494 {
1495 struct gendisk *disk = inode->i_bdev->bd_disk;
1496 struct atari_floppy_struct *floppy = disk->private_data;
1497 int drive = floppy - unit;
1498 int type = floppy->type;
1499 struct atari_format_descr fmt_desc;
1500 struct atari_disk_type *dtp;
1501 struct floppy_struct getprm;
1502 int settype;
1503 struct floppy_struct setprm;
1504
1505 switch (cmd) {
1506 case FDGETPRM:
1507 if (type) {
1508 if (--type >= NUM_DISK_MINORS)
1509 return -ENODEV;
1510 if (minor2disktype[type].drive_types > DriveType)
1511 return -ENODEV;
1512 type = minor2disktype[type].index;
1513 dtp = &disk_type[type];
1514 if (UD.flags & FTD_MSG)
1515 printk (KERN_ERR "floppy%d: found dtp %p name %s!\n",
1516 drive, dtp, dtp->name);
1517 }
1518 else {
1519 if (!UDT)
1520 return -ENXIO;
1521 else
1522 dtp = UDT;
1523 }
1524 memset((void *)&getprm, 0, sizeof(getprm));
1525 getprm.size = dtp->blocks;
1526 getprm.sect = dtp->spt;
1527 getprm.head = 2;
1528 getprm.track = dtp->blocks/dtp->spt/2;
1529 getprm.stretch = dtp->stretch;
1530 if (copy_to_user((void *)param, &getprm, sizeof(getprm)))
1531 return -EFAULT;
1532 return 0;
1533 }
1534 switch (cmd) {
1535 case FDSETPRM:
1536 case FDDEFPRM:
1537 /*
1538 * MSch 7/96: simple 'set geometry' case: just set the
1539 * 'default' device params (minor == 0).
1540 * Currently, the drive geometry is cleared after each
1541 * disk change and subsequent revalidate()! simple
1542 * implementation of FDDEFPRM: save geometry from a
1543 * FDDEFPRM call and restore it in floppy_revalidate() !
1544 */
1545
1546 /* get the parameters from user space */
1547 if (floppy->ref != 1 && floppy->ref != -1)
1548 return -EBUSY;
1549 if (copy_from_user(&setprm, (void *) param, sizeof(setprm)))
1550 return -EFAULT;
1551 /*
1552 * first of all: check for floppy change and revalidate,
1553 * or the next access will revalidate - and clear UDT :-(
1554 */
1555
1556 if (check_floppy_change(disk))
1557 floppy_revalidate(disk);
1558
1559 if (UD.flags & FTD_MSG)
1560 printk (KERN_INFO "floppy%d: setting size %d spt %d str %d!\n",
1561 drive, setprm.size, setprm.sect, setprm.stretch);
1562
1563 /* what if type > 0 here? Overwrite specified entry ? */
1564 if (type) {
1565 /* refuse to re-set a predefined type for now */
1566 redo_fd_request();
1567 return -EINVAL;
1568 }
1569
1570 /*
1571 * type == 0: first look for a matching entry in the type list,
1572 * and set the UD.disktype field to use the perdefined entry.
1573 * TODO: add user-defined format to head of autoprobe list ?
1574 * Useful to include the user-type for future autodetection!
1575 */
1576
1577 for (settype = 0; settype < NUM_DISK_MINORS; settype++) {
1578 int setidx = 0;
1579 if (minor2disktype[settype].drive_types > DriveType) {
1580 /* skip this one, invalid for drive ... */
1581 continue;
1582 }
1583 setidx = minor2disktype[settype].index;
1584 dtp = &disk_type[setidx];
1585
1586 /* found matching entry ?? */
1587 if ( dtp->blocks == setprm.size
1588 && dtp->spt == setprm.sect
1589 && dtp->stretch == setprm.stretch ) {
1590 if (UD.flags & FTD_MSG)
1591 printk (KERN_INFO "floppy%d: setting %s %p!\n",
1592 drive, dtp->name, dtp);
1593 UDT = dtp;
1594 set_capacity(floppy->disk, UDT->blocks);
1595
1596 if (cmd == FDDEFPRM) {
1597 /* save settings as permanent default type */
1598 default_params[drive].name = dtp->name;
1599 default_params[drive].spt = dtp->spt;
1600 default_params[drive].blocks = dtp->blocks;
1601 default_params[drive].fdc_speed = dtp->fdc_speed;
1602 default_params[drive].stretch = dtp->stretch;
1603 }
1604
1605 return 0;
1606 }
1607
1608 }
1609
1610 /* no matching disk type found above - setting user_params */
1611
1612 if (cmd == FDDEFPRM) {
1613 /* set permanent type */
1614 dtp = &default_params[drive];
1615 } else
1616 /* set user type (reset by disk change!) */
1617 dtp = &user_params[drive];
1618
1619 dtp->name = "user format";
1620 dtp->blocks = setprm.size;
1621 dtp->spt = setprm.sect;
1622 if (setprm.sect > 14)
1623 dtp->fdc_speed = 3;
1624 else
1625 dtp->fdc_speed = 0;
1626 dtp->stretch = setprm.stretch;
1627
1628 if (UD.flags & FTD_MSG)
1629 printk (KERN_INFO "floppy%d: blk %d spt %d str %d!\n",
1630 drive, dtp->blocks, dtp->spt, dtp->stretch);
1631
1632 /* sanity check */
1633 if (!dtp || setprm.track != dtp->blocks/dtp->spt/2 ||
1634 setprm.head != 2) {
1635 redo_fd_request();
1636 return -EINVAL;
1637 }
1638
1639 UDT = dtp;
1640 set_capacity(floppy->disk, UDT->blocks);
1641
1642 return 0;
1643 case FDMSGON:
1644 UD.flags |= FTD_MSG;
1645 return 0;
1646 case FDMSGOFF:
1647 UD.flags &= ~FTD_MSG;
1648 return 0;
1649 case FDSETEMSGTRESH:
1650 return -EINVAL;
1651 case FDFMTBEG:
1652 return 0;
1653 case FDFMTTRK:
1654 if (floppy->ref != 1 && floppy->ref != -1)
1655 return -EBUSY;
1656 if (copy_from_user(&fmt_desc, (void *) param, sizeof(fmt_desc)))
1657 return -EFAULT;
1658 return do_format(drive, type, &fmt_desc);
1659 case FDCLRPRM:
1660 UDT = NULL;
1661 /* MSch: invalidate default_params */
1662 default_params[drive].blocks = 0;
1663 set_capacity(floppy->disk, MAX_DISK_SIZE * 2);
1664 case FDFMTEND:
1665 case FDFLUSH:
1666 /* invalidate the buffer track to force a reread */
1667 BufferDrive = -1;
1668 set_bit(drive, &fake_change);
1669 check_disk_change(inode->i_bdev);
1670 return 0;
1671 default:
1672 return -EINVAL;
1673 }
1674 }
1675
1676
1677 /* Initialize the 'unit' variable for drive 'drive' */
1678
1679 static void __init fd_probe( int drive )
1680 {
1681 UD.connected = 0;
1682 UDT = NULL;
1683
1684 if (!fd_test_drive_present( drive ))
1685 return;
1686
1687 UD.connected = 1;
1688 UD.track = 0;
1689 switch( UserSteprate[drive] ) {
1690 case 2:
1691 UD.steprate = FDCSTEP_2;
1692 break;
1693 case 3:
1694 UD.steprate = FDCSTEP_3;
1695 break;
1696 case 6:
1697 UD.steprate = FDCSTEP_6;
1698 break;
1699 case 12:
1700 UD.steprate = FDCSTEP_12;
1701 break;
1702 default: /* should be -1 for "not set by user" */
1703 if (ATARIHW_PRESENT( FDCSPEED ) || MACH_IS_MEDUSA)
1704 UD.steprate = FDCSTEP_3;
1705 else
1706 UD.steprate = FDCSTEP_6;
1707 break;
1708 }
1709 MotorOn = 1; /* from probe restore operation! */
1710 }
1711
1712
1713 /* This function tests the physical presence of a floppy drive (not
1714 * whether a disk is inserted). This is done by issuing a restore
1715 * command, waiting max. 2 seconds (that should be enough to move the
1716 * head across the whole disk) and looking at the state of the "TR00"
1717 * signal. This should now be raised if there is a drive connected
1718 * (and there is no hardware failure :-) Otherwise, the drive is
1719 * declared absent.
1720 */
1721
1722 static int __init fd_test_drive_present( int drive )
1723 {
1724 unsigned long timeout;
1725 unsigned char status;
1726 int ok;
1727
1728 if (drive >= (MACH_IS_FALCON ? 1 : 2)) return( 0 );
1729 fd_select_drive( drive );
1730
1731 /* disable interrupt temporarily */
1732 atari_turnoff_irq( IRQ_MFP_FDC );
1733 FDC_WRITE (FDCREG_TRACK, 0xff00);
1734 FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | FDCCMDADD_H | FDCSTEP_6 );
1735
1736 timeout = jiffies + 2*HZ+HZ/2;
1737 while (time_before(jiffies, timeout))
1738 if (!(mfp.par_dt_reg & 0x20))
1739 break;
1740
1741 status = FDC_READ( FDCREG_STATUS );
1742 ok = (status & FDCSTAT_TR00) != 0;
1743
1744 /* force interrupt to abort restore operation (FDC would try
1745 * about 50 seconds!) */
1746 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1747 udelay(500);
1748 status = FDC_READ( FDCREG_STATUS );
1749 udelay(20);
1750
1751 if (ok) {
1752 /* dummy seek command to make WP bit accessible */
1753 FDC_WRITE( FDCREG_DATA, 0 );
1754 FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK );
1755 while( mfp.par_dt_reg & 0x20 )
1756 ;
1757 status = FDC_READ( FDCREG_STATUS );
1758 }
1759
1760 atari_turnon_irq( IRQ_MFP_FDC );
1761 return( ok );
1762 }
1763
1764
1765 /* Look how many and which kind of drives are connected. If there are
1766 * floppies, additionally start the disk-change and motor-off timers.
1767 */
1768
1769 static void __init config_types( void )
1770 {
1771 int drive, cnt = 0;
1772
1773 /* for probing drives, set the FDC speed to 8 MHz */
1774 if (ATARIHW_PRESENT(FDCSPEED))
1775 dma_wd.fdc_speed = 0;
1776
1777 printk(KERN_INFO "Probing floppy drive(s):\n");
1778 for( drive = 0; drive < FD_MAX_UNITS; drive++ ) {
1779 fd_probe( drive );
1780 if (UD.connected) {
1781 printk(KERN_INFO "fd%d\n", drive);
1782 ++cnt;
1783 }
1784 }
1785
1786 if (FDC_READ( FDCREG_STATUS ) & FDCSTAT_BUSY) {
1787 /* If FDC is still busy from probing, give it another FORCI
1788 * command to abort the operation. If this isn't done, the FDC
1789 * will interrupt later and its IRQ line stays low, because
1790 * the status register isn't read. And this will block any
1791 * interrupts on this IRQ line :-(
1792 */
1793 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1794 udelay(500);
1795 FDC_READ( FDCREG_STATUS );
1796 udelay(20);
1797 }
1798
1799 if (cnt > 0) {
1800 start_motor_off_timer();
1801 if (cnt == 1) fd_select_drive( 0 );
1802 start_check_change_timer();
1803 }
1804 }
1805
1806 /*
1807 * floppy_open check for aliasing (/dev/fd0 can be the same as
1808 * /dev/PS0 etc), and disallows simultaneous access to the same
1809 * drive with different device numbers.
1810 */
1811
1812 static int floppy_open( struct inode *inode, struct file *filp )
1813 {
1814 struct atari_floppy_struct *p = inode->i_bdev->bd_disk->private_data;
1815 int type = iminor(inode) >> 2;
1816
1817 DPRINT(("fd_open: type=%d\n",type));
1818 if (p->ref && p->type != type)
1819 return -EBUSY;
1820
1821 if (p->ref == -1 || (p->ref && filp->f_flags & O_EXCL))
1822 return -EBUSY;
1823
1824 if (filp->f_flags & O_EXCL)
1825 p->ref = -1;
1826 else
1827 p->ref++;
1828
1829 p->type = type;
1830
1831 if (filp->f_flags & O_NDELAY)
1832 return 0;
1833
1834 if (filp->f_mode & 3) {
1835 check_disk_change(inode->i_bdev);
1836 if (filp->f_mode & 2) {
1837 if (p->wpstat) {
1838 if (p->ref < 0)
1839 p->ref = 0;
1840 else
1841 p->ref--;
1842 floppy_release(inode, filp);
1843 return -EROFS;
1844 }
1845 }
1846 }
1847 return 0;
1848 }
1849
1850
1851 static int floppy_release( struct inode * inode, struct file * filp )
1852 {
1853 struct atari_floppy_struct *p = inode->i_bdev->bd_disk->private_data;
1854 if (p->ref < 0)
1855 p->ref = 0;
1856 else if (!p->ref--) {
1857 printk(KERN_ERR "floppy_release with fd_ref == 0");
1858 p->ref = 0;
1859 }
1860 return 0;
1861 }
1862
1863 static struct block_device_operations floppy_fops = {
1864 .owner = THIS_MODULE,
1865 .open = floppy_open,
1866 .release = floppy_release,
1867 .ioctl = fd_ioctl,
1868 .media_changed = check_floppy_change,
1869 .revalidate_disk= floppy_revalidate,
1870 };
1871
1872 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
1873 {
1874 int drive = *part & 3;
1875 int type = *part >> 2;
1876 if (drive >= FD_MAX_UNITS || type > NUM_DISK_MINORS)
1877 return NULL;
1878 *part = 0;
1879 return get_disk(unit[drive].disk);
1880 }
1881
1882 static int __init atari_floppy_init (void)
1883 {
1884 int i;
1885
1886 if (!MACH_IS_ATARI)
1887 /* Amiga, Mac, ... don't have Atari-compatible floppy :-) */
1888 return -ENXIO;
1889
1890 if (MACH_IS_HADES)
1891 /* Hades doesn't have Atari-compatible floppy */
1892 return -ENXIO;
1893
1894 if (register_blkdev(FLOPPY_MAJOR,"fd"))
1895 return -EBUSY;
1896
1897 for (i = 0; i < FD_MAX_UNITS; i++) {
1898 unit[i].disk = alloc_disk(1);
1899 if (!unit[i].disk)
1900 goto Enomem;
1901 }
1902
1903 if (UseTrackbuffer < 0)
1904 /* not set by user -> use default: for now, we turn
1905 track buffering off for all Medusas, though it
1906 could be used with ones that have a counter
1907 card. But the test is too hard :-( */
1908 UseTrackbuffer = !MACH_IS_MEDUSA;
1909
1910 /* initialize variables */
1911 SelectedDrive = -1;
1912 BufferDrive = -1;
1913
1914 DMABuffer = atari_stram_alloc(BUFFER_SIZE+512, "ataflop");
1915 if (!DMABuffer) {
1916 printk(KERN_ERR "atari_floppy_init: cannot get dma buffer\n");
1917 goto Enomem;
1918 }
1919 TrackBuffer = DMABuffer + 512;
1920 PhysDMABuffer = virt_to_phys(DMABuffer);
1921 PhysTrackBuffer = virt_to_phys(TrackBuffer);
1922 BufferDrive = BufferSide = BufferTrack = -1;
1923
1924 floppy_queue = blk_init_queue(do_fd_request, &ataflop_lock);
1925 if (!floppy_queue)
1926 goto Enomem;
1927
1928 for (i = 0; i < FD_MAX_UNITS; i++) {
1929 unit[i].track = -1;
1930 unit[i].flags = 0;
1931 unit[i].disk->major = FLOPPY_MAJOR;
1932 unit[i].disk->first_minor = i;
1933 sprintf(unit[i].disk->disk_name, "fd%d", i);
1934 unit[i].disk->fops = &floppy_fops;
1935 unit[i].disk->private_data = &unit[i];
1936 unit[i].disk->queue = floppy_queue;
1937 set_capacity(unit[i].disk, MAX_DISK_SIZE * 2);
1938 add_disk(unit[i].disk);
1939 }
1940
1941 blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
1942 floppy_find, NULL, NULL);
1943
1944 printk(KERN_INFO "Atari floppy driver: max. %cD, %strack buffering\n",
1945 DriveType == 0 ? 'D' : DriveType == 1 ? 'H' : 'E',
1946 UseTrackbuffer ? "" : "no ");
1947 config_types();
1948
1949 return 0;
1950 Enomem:
1951 while (i--)
1952 put_disk(unit[i].disk);
1953 if (floppy_queue)
1954 blk_cleanup_queue(floppy_queue);
1955 unregister_blkdev(FLOPPY_MAJOR, "fd");
1956 return -ENOMEM;
1957 }
1958
1959
1960 void __init atari_floppy_setup( char *str, int *ints )
1961 {
1962 int i;
1963
1964 if (ints[0] < 1) {
1965 printk(KERN_ERR "ataflop_setup: no arguments!\n" );
1966 return;
1967 }
1968 else if (ints[0] > 2+FD_MAX_UNITS) {
1969 printk(KERN_ERR "ataflop_setup: too many arguments\n" );
1970 }
1971
1972 if (ints[1] < 0 || ints[1] > 2)
1973 printk(KERN_ERR "ataflop_setup: bad drive type\n" );
1974 else
1975 DriveType = ints[1];
1976
1977 if (ints[0] >= 2)
1978 UseTrackbuffer = (ints[2] > 0);
1979
1980 for( i = 3; i <= ints[0] && i-3 < FD_MAX_UNITS; ++i ) {
1981 if (ints[i] != 2 && ints[i] != 3 && ints[i] != 6 && ints[i] != 12)
1982 printk(KERN_ERR "ataflop_setup: bad steprate\n" );
1983 else
1984 UserSteprate[i-3] = ints[i];
1985 }
1986 }
1987
1988 static void atari_floppy_exit(void)
1989 {
1990 int i;
1991 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
1992 for (i = 0; i < FD_MAX_UNITS; i++) {
1993 del_gendisk(unit[i].disk);
1994 put_disk(unit[i].disk);
1995 }
1996 unregister_blkdev(FLOPPY_MAJOR, "fd");
1997
1998 blk_cleanup_queue(floppy_queue);
1999 del_timer_sync(&fd_timer);
2000 atari_stram_free( DMABuffer );
2001 }
2002
2003 module_init(atari_floppy_init)
2004 module_exit(atari_floppy_exit)
2005
2006 MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)