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Linux 2.6.34-rc3
[pohmelfs.git] / drivers / block / ataflop.c
blobe35cf59cbfde3b0cef6ce6ddb98c3ae38dc47b7d
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 static struct request *fd_request;
83
84 /* Disk types: DD, HD, ED */
85 static struct atari_disk_type {
86 const char *name;
87 unsigned spt; /* sectors per track */
88 unsigned blocks; /* total number of blocks */
89 unsigned fdc_speed; /* fdc_speed setting */
90 unsigned stretch; /* track doubling ? */
91 } atari_disk_type[] = {
92 { "d360", 9, 720, 0, 0}, /* 0: 360kB diskette */
93 { "D360", 9, 720, 0, 1}, /* 1: 360kb in 720k or 1.2MB drive */
94 { "D720", 9,1440, 0, 0}, /* 2: 720kb in 720k or 1.2MB drive */
95 { "D820", 10,1640, 0, 0}, /* 3: DD disk with 82 tracks/10 sectors */
96 /* formats above are probed for type DD */
97 #define MAX_TYPE_DD 3
98 { "h1200",15,2400, 3, 0}, /* 4: 1.2MB diskette */
99 { "H1440",18,2880, 3, 0}, /* 5: 1.4 MB diskette (HD) */
100 { "H1640",20,3280, 3, 0}, /* 6: 1.64MB diskette (fat HD) 82 tr 20 sec */
101 /* formats above are probed for types DD and HD */
102 #define MAX_TYPE_HD 6
103 { "E2880",36,5760, 3, 0}, /* 7: 2.8 MB diskette (ED) */
104 { "E3280",40,6560, 3, 0}, /* 8: 3.2 MB diskette (fat ED) 82 tr 40 sec */
105 /* formats above are probed for types DD, HD and ED */
106 #define MAX_TYPE_ED 8
107 /* types below are never autoprobed */
108 { "H1680",21,3360, 3, 0}, /* 9: 1.68MB diskette (fat HD) 80 tr 21 sec */
109 { "h410",10,820, 0, 1}, /* 10: 410k diskette 41 tr 10 sec, stretch */
110 { "h1476",18,2952, 3, 0}, /* 11: 1.48MB diskette 82 tr 18 sec */
111 { "H1722",21,3444, 3, 0}, /* 12: 1.72MB diskette 82 tr 21 sec */
112 { "h420",10,840, 0, 1}, /* 13: 420k diskette 42 tr 10 sec, stretch */
113 { "H830",10,1660, 0, 0}, /* 14: 820k diskette 83 tr 10 sec */
114 { "h1494",18,2952, 3, 0}, /* 15: 1.49MB diskette 83 tr 18 sec */
115 { "H1743",21,3486, 3, 0}, /* 16: 1.74MB diskette 83 tr 21 sec */
116 { "h880",11,1760, 0, 0}, /* 17: 880k diskette 80 tr 11 sec */
117 { "D1040",13,2080, 0, 0}, /* 18: 1.04MB diskette 80 tr 13 sec */
118 { "D1120",14,2240, 0, 0}, /* 19: 1.12MB diskette 80 tr 14 sec */
119 { "h1600",20,3200, 3, 0}, /* 20: 1.60MB diskette 80 tr 20 sec */
120 { "H1760",22,3520, 3, 0}, /* 21: 1.76MB diskette 80 tr 22 sec */
121 { "H1920",24,3840, 3, 0}, /* 22: 1.92MB diskette 80 tr 24 sec */
122 { "E3200",40,6400, 3, 0}, /* 23: 3.2MB diskette 80 tr 40 sec */
123 { "E3520",44,7040, 3, 0}, /* 24: 3.52MB diskette 80 tr 44 sec */
124 { "E3840",48,7680, 3, 0}, /* 25: 3.84MB diskette 80 tr 48 sec */
125 { "H1840",23,3680, 3, 0}, /* 26: 1.84MB diskette 80 tr 23 sec */
126 { "D800",10,1600, 0, 0}, /* 27: 800k diskette 80 tr 10 sec */
127 };
128
129 static int StartDiskType[] = {
130 MAX_TYPE_DD,
131 MAX_TYPE_HD,
132 MAX_TYPE_ED
133 };
134
135 #define TYPE_DD 0
136 #define TYPE_HD 1
137 #define TYPE_ED 2
138
139 static int DriveType = TYPE_HD;
140
141 static DEFINE_SPINLOCK(ataflop_lock);
142
143 /* Array for translating minors into disk formats */
144 static struct {
145 int index;
146 unsigned drive_types;
147 } minor2disktype[] = {
148 { 0, TYPE_DD }, /* 1: d360 */
149 { 4, TYPE_HD }, /* 2: h1200 */
150 { 1, TYPE_DD }, /* 3: D360 */
151 { 2, TYPE_DD }, /* 4: D720 */
152 { 1, TYPE_DD }, /* 5: h360 = D360 */
153 { 2, TYPE_DD }, /* 6: h720 = D720 */
154 { 5, TYPE_HD }, /* 7: H1440 */
155 { 7, TYPE_ED }, /* 8: E2880 */
156 /* some PC formats :-) */
157 { 8, TYPE_ED }, /* 9: E3280 <- was "CompaQ" == E2880 for PC */
158 { 5, TYPE_HD }, /* 10: h1440 = H1440 */
159 { 9, TYPE_HD }, /* 11: H1680 */
160 { 10, TYPE_DD }, /* 12: h410 */
161 { 3, TYPE_DD }, /* 13: H820 <- == D820, 82x10 */
162 { 11, TYPE_HD }, /* 14: h1476 */
163 { 12, TYPE_HD }, /* 15: H1722 */
164 { 13, TYPE_DD }, /* 16: h420 */
165 { 14, TYPE_DD }, /* 17: H830 */
166 { 15, TYPE_HD }, /* 18: h1494 */
167 { 16, TYPE_HD }, /* 19: H1743 */
168 { 17, TYPE_DD }, /* 20: h880 */
169 { 18, TYPE_DD }, /* 21: D1040 */
170 { 19, TYPE_DD }, /* 22: D1120 */
171 { 20, TYPE_HD }, /* 23: h1600 */
172 { 21, TYPE_HD }, /* 24: H1760 */
173 { 22, TYPE_HD }, /* 25: H1920 */
174 { 23, TYPE_ED }, /* 26: E3200 */
175 { 24, TYPE_ED }, /* 27: E3520 */
176 { 25, TYPE_ED }, /* 28: E3840 */
177 { 26, TYPE_HD }, /* 29: H1840 */
178 { 27, TYPE_DD }, /* 30: D800 */
179 { 6, TYPE_HD }, /* 31: H1640 <- was H1600 == h1600 for PC */
180 };
181
182 #define NUM_DISK_MINORS ARRAY_SIZE(minor2disktype)
183
184 /*
185 * Maximum disk size (in kilobytes). This default is used whenever the
186 * current disk size is unknown.
187 */
188 #define MAX_DISK_SIZE 3280
189
190 /*
191 * MSch: User-provided type information. 'drive' points to
192 * the respective entry of this array. Set by FDSETPRM ioctls.
193 */
194 static struct atari_disk_type user_params[FD_MAX_UNITS];
195
196 /*
197 * User-provided permanent type information. 'drive' points to
198 * the respective entry of this array. Set by FDDEFPRM ioctls,
199 * restored upon disk change by floppy_revalidate() if valid (as seen by
200 * default_params[].blocks > 0 - a bit in unit[].flags might be used for this?)
201 */
202 static struct atari_disk_type default_params[FD_MAX_UNITS];
203
204 /* current info on each unit */
205 static struct atari_floppy_struct {
206 int connected; /* !=0 : drive is connected */
207 int autoprobe; /* !=0 : do autoprobe */
208
209 struct atari_disk_type *disktype; /* current type of disk */
210
211 int track; /* current head position or -1 if
212 unknown */
213 unsigned int steprate; /* steprate setting */
214 unsigned int wpstat; /* current state of WP signal (for
215 disk change detection) */
216 int flags; /* flags */
217 struct gendisk *disk;
218 int ref;
219 int type;
220 } unit[FD_MAX_UNITS];
221
222 #define UD unit[drive]
223 #define UDT unit[drive].disktype
224 #define SUD unit[SelectedDrive]
225 #define SUDT unit[SelectedDrive].disktype
226
227
228 #define FDC_READ(reg) ({ \
229 /* unsigned long __flags; */ \
230 unsigned short __val; \
231 /* local_irq_save(__flags); */ \
232 dma_wd.dma_mode_status = 0x80 | (reg); \
233 udelay(25); \
234 __val = dma_wd.fdc_acces_seccount; \
235 MFPDELAY(); \
236 /* local_irq_restore(__flags); */ \
237 __val & 0xff; \
238 })
239
240 #define FDC_WRITE(reg,val) \
241 do { \
242 /* unsigned long __flags; */ \
243 /* local_irq_save(__flags); */ \
244 dma_wd.dma_mode_status = 0x80 | (reg); \
245 udelay(25); \
246 dma_wd.fdc_acces_seccount = (val); \
247 MFPDELAY(); \
248 /* local_irq_restore(__flags); */ \
249 } while(0)
250
251
252 /* Buffering variables:
253 * First, there is a DMA buffer in ST-RAM that is used for floppy DMA
254 * operations. Second, a track buffer is used to cache a whole track
255 * of the disk to save read operations. These are two separate buffers
256 * because that allows write operations without clearing the track buffer.
257 */
258
259 static int MaxSectors[] = {
260 11, 22, 44
261 };
262 static int BufferSize[] = {
263 15*512, 30*512, 60*512
264 };
265
266 #define BUFFER_SIZE (BufferSize[DriveType])
267
268 unsigned char *DMABuffer; /* buffer for writes */
269 static unsigned long PhysDMABuffer; /* physical address */
270
271 static int UseTrackbuffer = -1; /* Do track buffering? */
272 module_param(UseTrackbuffer, int, 0);
273
274 unsigned char *TrackBuffer; /* buffer for reads */
275 static unsigned long PhysTrackBuffer; /* physical address */
276 static int BufferDrive, BufferSide, BufferTrack;
277 static int read_track; /* non-zero if we are reading whole tracks */
278
279 #define SECTOR_BUFFER(sec) (TrackBuffer + ((sec)-1)*512)
280 #define IS_BUFFERED(drive,side,track) \
281 (BufferDrive == (drive) && BufferSide == (side) && BufferTrack == (track))
282
283 /*
284 * These are global variables, as that's the easiest way to give
285 * information to interrupts. They are the data used for the current
286 * request.
287 */
288 static int SelectedDrive = 0;
289 static int ReqCmd, ReqBlock;
290 static int ReqSide, ReqTrack, ReqSector, ReqCnt;
291 static int HeadSettleFlag = 0;
292 static unsigned char *ReqData, *ReqBuffer;
293 static int MotorOn = 0, MotorOffTrys;
294 static int IsFormatting = 0, FormatError;
295
296 static int UserSteprate[FD_MAX_UNITS] = { -1, -1 };
297 module_param_array(UserSteprate, int, NULL, 0);
298
299 /* Synchronization of FDC access. */
300 static volatile int fdc_busy = 0;
301 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
302 static DECLARE_WAIT_QUEUE_HEAD(format_wait);
303
304 static unsigned long changed_floppies = 0xff, fake_change = 0;
305 #define CHECK_CHANGE_DELAY HZ/2
306
307 #define FD_MOTOR_OFF_DELAY (3*HZ)
308 #define FD_MOTOR_OFF_MAXTRY (10*20)
309
310 #define FLOPPY_TIMEOUT (6*HZ)
311 #define RECALIBRATE_ERRORS 4 /* After this many errors the drive
312 * will be recalibrated. */
313 #define MAX_ERRORS 8 /* After this many errors the driver
314 * will give up. */
315
316
317 /*
318 * The driver is trying to determine the correct media format
319 * while Probing is set. fd_rwsec_done() clears it after a
320 * successful access.
321 */
322 static int Probing = 0;
323
324 /* This flag is set when a dummy seek is necessary to make the WP
325 * status bit accessible.
326 */
327 static int NeedSeek = 0;
328
329
330 #ifdef DEBUG
331 #define DPRINT(a) printk a
332 #else
333 #define DPRINT(a)
334 #endif
335
336 /***************************** Prototypes *****************************/
337
338 static void fd_select_side( int side );
339 static void fd_select_drive( int drive );
340 static void fd_deselect( void );
341 static void fd_motor_off_timer( unsigned long dummy );
342 static void check_change( unsigned long dummy );
343 static irqreturn_t floppy_irq (int irq, void *dummy);
344 static void fd_error( void );
345 static int do_format(int drive, int type, struct atari_format_descr *desc);
346 static void do_fd_action( int drive );
347 static void fd_calibrate( void );
348 static void fd_calibrate_done( int status );
349 static void fd_seek( void );
350 static void fd_seek_done( int status );
351 static void fd_rwsec( void );
352 static void fd_readtrack_check( unsigned long dummy );
353 static void fd_rwsec_done( int status );
354 static void fd_rwsec_done1(int status);
355 static void fd_writetrack( void );
356 static void fd_writetrack_done( int status );
357 static void fd_times_out( unsigned long dummy );
358 static void finish_fdc( void );
359 static void finish_fdc_done( int dummy );
360 static void setup_req_params( int drive );
361 static void redo_fd_request( void);
362 static int fd_ioctl(struct block_device *bdev, fmode_t mode, unsigned int
363 cmd, unsigned long param);
364 static void fd_probe( int drive );
365 static int fd_test_drive_present( int drive );
366 static void config_types( void );
367 static int floppy_open(struct block_device *bdev, fmode_t mode);
368 static int floppy_release(struct gendisk *disk, fmode_t mode);
369
370 /************************* End of Prototypes **************************/
371
372 static DEFINE_TIMER(motor_off_timer, fd_motor_off_timer, 0, 0);
373 static DEFINE_TIMER(readtrack_timer, fd_readtrack_check, 0, 0);
374 static DEFINE_TIMER(timeout_timer, fd_times_out, 0, 0);
375 static DEFINE_TIMER(fd_timer, check_change, 0, 0);
376
377 static void fd_end_request_cur(int err)
378 {
379 if (!__blk_end_request_cur(fd_request, err))
380 fd_request = NULL;
381 }
382
383 static inline void start_motor_off_timer(void)
384 {
385 mod_timer(&motor_off_timer, jiffies + FD_MOTOR_OFF_DELAY);
386 MotorOffTrys = 0;
387 }
388
389 static inline void start_check_change_timer( void )
390 {
391 mod_timer(&fd_timer, jiffies + CHECK_CHANGE_DELAY);
392 }
393
394 static inline void start_timeout(void)
395 {
396 mod_timer(&timeout_timer, jiffies + FLOPPY_TIMEOUT);
397 }
398
399 static inline void stop_timeout(void)
400 {
401 del_timer(&timeout_timer);
402 }
403
404 /* Select the side to use. */
405
406 static void fd_select_side( int side )
407 {
408 unsigned long flags;
409
410 /* protect against various other ints mucking around with the PSG */
411 local_irq_save(flags);
412
413 sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */
414 sound_ym.wd_data = (side == 0) ? sound_ym.rd_data_reg_sel | 0x01 :
415 sound_ym.rd_data_reg_sel & 0xfe;
416
417 local_irq_restore(flags);
418 }
419
420
421 /* Select a drive, update the FDC's track register and set the correct
422 * clock speed for this disk's type.
423 */
424
425 static void fd_select_drive( int drive )
426 {
427 unsigned long flags;
428 unsigned char tmp;
429
430 if (drive == SelectedDrive)
431 return;
432
433 /* protect against various other ints mucking around with the PSG */
434 local_irq_save(flags);
435 sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */
436 tmp = sound_ym.rd_data_reg_sel;
437 sound_ym.wd_data = (tmp | DSKDRVNONE) & ~(drive == 0 ? DSKDRV0 : DSKDRV1);
438 atari_dont_touch_floppy_select = 1;
439 local_irq_restore(flags);
440
441 /* restore track register to saved value */
442 FDC_WRITE( FDCREG_TRACK, UD.track );
443 udelay(25);
444
445 /* select 8/16 MHz */
446 if (UDT)
447 if (ATARIHW_PRESENT(FDCSPEED))
448 dma_wd.fdc_speed = UDT->fdc_speed;
449
450 SelectedDrive = drive;
451 }
452
453
454 /* Deselect both drives. */
455
456 static void fd_deselect( void )
457 {
458 unsigned long flags;
459
460 /* protect against various other ints mucking around with the PSG */
461 local_irq_save(flags);
462 atari_dont_touch_floppy_select = 0;
463 sound_ym.rd_data_reg_sel=14; /* Select PSG Port A */
464 sound_ym.wd_data = (sound_ym.rd_data_reg_sel |
465 (MACH_IS_FALCON ? 3 : 7)); /* no drives selected */
466 /* On Falcon, the drive B select line is used on the printer port, so
467 * leave it alone... */
468 SelectedDrive = -1;
469 local_irq_restore(flags);
470 }
471
472
473 /* This timer function deselects the drives when the FDC switched the
474 * motor off. The deselection cannot happen earlier because the FDC
475 * counts the index signals, which arrive only if one drive is selected.
476 */
477
478 static void fd_motor_off_timer( unsigned long dummy )
479 {
480 unsigned char status;
481
482 if (SelectedDrive < 0)
483 /* no drive selected, needn't deselect anyone */
484 return;
485
486 if (stdma_islocked())
487 goto retry;
488
489 status = FDC_READ( FDCREG_STATUS );
490
491 if (!(status & 0x80)) {
492 /* motor already turned off by FDC -> deselect drives */
493 MotorOn = 0;
494 fd_deselect();
495 return;
496 }
497 /* not yet off, try again */
498
499 retry:
500 /* Test again later; if tested too often, it seems there is no disk
501 * in the drive and the FDC will leave the motor on forever (or,
502 * at least until a disk is inserted). So we'll test only twice
503 * per second from then on...
504 */
505 mod_timer(&motor_off_timer,
506 jiffies + (MotorOffTrys++ < FD_MOTOR_OFF_MAXTRY ? HZ/20 : HZ/2));
507 }
508
509
510 /* This function is repeatedly called to detect disk changes (as good
511 * as possible) and keep track of the current state of the write protection.
512 */
513
514 static void check_change( unsigned long dummy )
515 {
516 static int drive = 0;
517
518 unsigned long flags;
519 unsigned char old_porta;
520 int stat;
521
522 if (++drive > 1 || !UD.connected)
523 drive = 0;
524
525 /* protect against various other ints mucking around with the PSG */
526 local_irq_save(flags);
527
528 if (!stdma_islocked()) {
529 sound_ym.rd_data_reg_sel = 14;
530 old_porta = sound_ym.rd_data_reg_sel;
531 sound_ym.wd_data = (old_porta | DSKDRVNONE) &
532 ~(drive == 0 ? DSKDRV0 : DSKDRV1);
533 stat = !!(FDC_READ( FDCREG_STATUS ) & FDCSTAT_WPROT);
534 sound_ym.wd_data = old_porta;
535
536 if (stat != UD.wpstat) {
537 DPRINT(( "wpstat[%d] = %d\n", drive, stat ));
538 UD.wpstat = stat;
539 set_bit (drive, &changed_floppies);
540 }
541 }
542 local_irq_restore(flags);
543
544 start_check_change_timer();
545 }
546
547
548 /* Handling of the Head Settling Flag: This flag should be set after each
549 * seek operation, because we don't use seeks with verify.
550 */
551
552 static inline void set_head_settle_flag(void)
553 {
554 HeadSettleFlag = FDCCMDADD_E;
555 }
556
557 static inline int get_head_settle_flag(void)
558 {
559 int tmp = HeadSettleFlag;
560 HeadSettleFlag = 0;
561 return( tmp );
562 }
563
564 static inline void copy_buffer(void *from, void *to)
565 {
566 ulong *p1 = (ulong *)from, *p2 = (ulong *)to;
567 int cnt;
568
569 for (cnt = 512/4; cnt; cnt--)
570 *p2++ = *p1++;
571 }
572
573
574
575
576 /* General Interrupt Handling */
577
578 static void (*FloppyIRQHandler)( int status ) = NULL;
579
580 static irqreturn_t floppy_irq (int irq, void *dummy)
581 {
582 unsigned char status;
583 void (*handler)( int );
584
585 handler = xchg(&FloppyIRQHandler, NULL);
586
587 if (handler) {
588 nop();
589 status = FDC_READ( FDCREG_STATUS );
590 DPRINT(("FDC irq, status = %02x handler = %08lx\n",status,(unsigned long)handler));
591 handler( status );
592 }
593 else {
594 DPRINT(("FDC irq, no handler\n"));
595 }
596 return IRQ_HANDLED;
597 }
598
599
600 /* Error handling: If some error happened, retry some times, then
601 * recalibrate, then try again, and fail after MAX_ERRORS.
602 */
603
604 static void fd_error( void )
605 {
606 if (IsFormatting) {
607 IsFormatting = 0;
608 FormatError = 1;
609 wake_up( &format_wait );
610 return;
611 }
612
613 if (!fd_request)
614 return;
615
616 fd_request->errors++;
617 if (fd_request->errors >= MAX_ERRORS) {
618 printk(KERN_ERR "fd%d: too many errors.\n", SelectedDrive );
619 fd_end_request_cur(-EIO);
620 }
621 else if (fd_request->errors == RECALIBRATE_ERRORS) {
622 printk(KERN_WARNING "fd%d: recalibrating\n", SelectedDrive );
623 if (SelectedDrive != -1)
624 SUD.track = -1;
625 }
626 redo_fd_request();
627 }
628
629
630
631 #define SET_IRQ_HANDLER(proc) do { FloppyIRQHandler = (proc); } while(0)
632
633
634 /* ---------- Formatting ---------- */
635
636 #define FILL(n,val) \
637 do { \
638 memset( p, val, n ); \
639 p += n; \
640 } while(0)
641
642 static int do_format(int drive, int type, struct atari_format_descr *desc)
643 {
644 unsigned char *p;
645 int sect, nsect;
646 unsigned long flags;
647
648 DPRINT(("do_format( dr=%d tr=%d he=%d offs=%d )\n",
649 drive, desc->track, desc->head, desc->sect_offset ));
650
651 local_irq_save(flags);
652 while( fdc_busy ) sleep_on( &fdc_wait );
653 fdc_busy = 1;
654 stdma_lock(floppy_irq, NULL);
655 atari_turnon_irq( IRQ_MFP_FDC ); /* should be already, just to be sure */
656 local_irq_restore(flags);
657
658 if (type) {
659 if (--type >= NUM_DISK_MINORS ||
660 minor2disktype[type].drive_types > DriveType) {
661 redo_fd_request();
662 return -EINVAL;
663 }
664 type = minor2disktype[type].index;
665 UDT = &atari_disk_type[type];
666 }
667
668 if (!UDT || desc->track >= UDT->blocks/UDT->spt/2 || desc->head >= 2) {
669 redo_fd_request();
670 return -EINVAL;
671 }
672
673 nsect = UDT->spt;
674 p = TrackBuffer;
675 /* The track buffer is used for the raw track data, so its
676 contents become invalid! */
677 BufferDrive = -1;
678 /* stop deselect timer */
679 del_timer( &motor_off_timer );
680
681 FILL( 60 * (nsect / 9), 0x4e );
682 for( sect = 0; sect < nsect; ++sect ) {
683 FILL( 12, 0 );
684 FILL( 3, 0xf5 );
685 *p++ = 0xfe;
686 *p++ = desc->track;
687 *p++ = desc->head;
688 *p++ = (nsect + sect - desc->sect_offset) % nsect + 1;
689 *p++ = 2;
690 *p++ = 0xf7;
691 FILL( 22, 0x4e );
692 FILL( 12, 0 );
693 FILL( 3, 0xf5 );
694 *p++ = 0xfb;
695 FILL( 512, 0xe5 );
696 *p++ = 0xf7;
697 FILL( 40, 0x4e );
698 }
699 FILL( TrackBuffer+BUFFER_SIZE-p, 0x4e );
700
701 IsFormatting = 1;
702 FormatError = 0;
703 ReqTrack = desc->track;
704 ReqSide = desc->head;
705 do_fd_action( drive );
706
707 sleep_on( &format_wait );
708
709 redo_fd_request();
710 return( FormatError ? -EIO : 0 );
711 }
712
713
714 /* do_fd_action() is the general procedure for a fd request: All
715 * required parameter settings (drive select, side select, track
716 * position) are checked and set if needed. For each of these
717 * parameters and the actual reading or writing exist two functions:
718 * one that starts the setting (or skips it if possible) and one
719 * callback for the "done" interrupt. Each done func calls the next
720 * set function to propagate the request down to fd_rwsec_done().
721 */
722
723 static void do_fd_action( int drive )
724 {
725 DPRINT(("do_fd_action\n"));
726
727 if (UseTrackbuffer && !IsFormatting) {
728 repeat:
729 if (IS_BUFFERED( drive, ReqSide, ReqTrack )) {
730 if (ReqCmd == READ) {
731 copy_buffer( SECTOR_BUFFER(ReqSector), ReqData );
732 if (++ReqCnt < blk_rq_cur_sectors(fd_request)) {
733 /* read next sector */
734 setup_req_params( drive );
735 goto repeat;
736 }
737 else {
738 /* all sectors finished */
739 fd_end_request_cur(0);
740 redo_fd_request();
741 return;
742 }
743 }
744 else {
745 /* cmd == WRITE, pay attention to track buffer
746 * consistency! */
747 copy_buffer( ReqData, SECTOR_BUFFER(ReqSector) );
748 }
749 }
750 }
751
752 if (SelectedDrive != drive)
753 fd_select_drive( drive );
754
755 if (UD.track == -1)
756 fd_calibrate();
757 else if (UD.track != ReqTrack << UDT->stretch)
758 fd_seek();
759 else if (IsFormatting)
760 fd_writetrack();
761 else
762 fd_rwsec();
763 }
764
765
766 /* Seek to track 0 if the current track is unknown */
767
768 static void fd_calibrate( void )
769 {
770 if (SUD.track >= 0) {
771 fd_calibrate_done( 0 );
772 return;
773 }
774
775 if (ATARIHW_PRESENT(FDCSPEED))
776 dma_wd.fdc_speed = 0; /* always seek with 8 Mhz */;
777 DPRINT(("fd_calibrate\n"));
778 SET_IRQ_HANDLER( fd_calibrate_done );
779 /* we can't verify, since the speed may be incorrect */
780 FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | SUD.steprate );
781
782 NeedSeek = 1;
783 MotorOn = 1;
784 start_timeout();
785 /* wait for IRQ */
786 }
787
788
789 static void fd_calibrate_done( int status )
790 {
791 DPRINT(("fd_calibrate_done()\n"));
792 stop_timeout();
793
794 /* set the correct speed now */
795 if (ATARIHW_PRESENT(FDCSPEED))
796 dma_wd.fdc_speed = SUDT->fdc_speed;
797 if (status & FDCSTAT_RECNF) {
798 printk(KERN_ERR "fd%d: restore failed\n", SelectedDrive );
799 fd_error();
800 }
801 else {
802 SUD.track = 0;
803 fd_seek();
804 }
805 }
806
807
808 /* Seek the drive to the requested track. The drive must have been
809 * calibrated at some point before this.
810 */
811
812 static void fd_seek( void )
813 {
814 if (SUD.track == ReqTrack << SUDT->stretch) {
815 fd_seek_done( 0 );
816 return;
817 }
818
819 if (ATARIHW_PRESENT(FDCSPEED)) {
820 dma_wd.fdc_speed = 0; /* always seek witch 8 Mhz */
821 MFPDELAY();
822 }
823
824 DPRINT(("fd_seek() to track %d\n",ReqTrack));
825 FDC_WRITE( FDCREG_DATA, ReqTrack << SUDT->stretch);
826 udelay(25);
827 SET_IRQ_HANDLER( fd_seek_done );
828 FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK | SUD.steprate );
829
830 MotorOn = 1;
831 set_head_settle_flag();
832 start_timeout();
833 /* wait for IRQ */
834 }
835
836
837 static void fd_seek_done( int status )
838 {
839 DPRINT(("fd_seek_done()\n"));
840 stop_timeout();
841
842 /* set the correct speed */
843 if (ATARIHW_PRESENT(FDCSPEED))
844 dma_wd.fdc_speed = SUDT->fdc_speed;
845 if (status & FDCSTAT_RECNF) {
846 printk(KERN_ERR "fd%d: seek error (to track %d)\n",
847 SelectedDrive, ReqTrack );
848 /* we don't know exactly which track we are on now! */
849 SUD.track = -1;
850 fd_error();
851 }
852 else {
853 SUD.track = ReqTrack << SUDT->stretch;
854 NeedSeek = 0;
855 if (IsFormatting)
856 fd_writetrack();
857 else
858 fd_rwsec();
859 }
860 }
861
862
863 /* This does the actual reading/writing after positioning the head
864 * over the correct track.
865 */
866
867 static int MultReadInProgress = 0;
868
869
870 static void fd_rwsec( void )
871 {
872 unsigned long paddr, flags;
873 unsigned int rwflag, old_motoron;
874 unsigned int track;
875
876 DPRINT(("fd_rwsec(), Sec=%d, Access=%c\n",ReqSector, ReqCmd == WRITE ? 'w' : 'r' ));
877 if (ReqCmd == WRITE) {
878 if (ATARIHW_PRESENT(EXTD_DMA)) {
879 paddr = virt_to_phys(ReqData);
880 }
881 else {
882 copy_buffer( ReqData, DMABuffer );
883 paddr = PhysDMABuffer;
884 }
885 dma_cache_maintenance( paddr, 512, 1 );
886 rwflag = 0x100;
887 }
888 else {
889 if (read_track)
890 paddr = PhysTrackBuffer;
891 else
892 paddr = ATARIHW_PRESENT(EXTD_DMA) ?
893 virt_to_phys(ReqData) : PhysDMABuffer;
894 rwflag = 0;
895 }
896
897 fd_select_side( ReqSide );
898
899 /* Start sector of this operation */
900 FDC_WRITE( FDCREG_SECTOR, read_track ? 1 : ReqSector );
901 MFPDELAY();
902 /* Cheat for track if stretch != 0 */
903 if (SUDT->stretch) {
904 track = FDC_READ( FDCREG_TRACK);
905 MFPDELAY();
906 FDC_WRITE( FDCREG_TRACK, track >> SUDT->stretch);
907 }
908 udelay(25);
909
910 /* Setup DMA */
911 local_irq_save(flags);
912 dma_wd.dma_lo = (unsigned char)paddr;
913 MFPDELAY();
914 paddr >>= 8;
915 dma_wd.dma_md = (unsigned char)paddr;
916 MFPDELAY();
917 paddr >>= 8;
918 if (ATARIHW_PRESENT(EXTD_DMA))
919 st_dma_ext_dmahi = (unsigned short)paddr;
920 else
921 dma_wd.dma_hi = (unsigned char)paddr;
922 MFPDELAY();
923 local_irq_restore(flags);
924
925 /* Clear FIFO and switch DMA to correct mode */
926 dma_wd.dma_mode_status = 0x90 | rwflag;
927 MFPDELAY();
928 dma_wd.dma_mode_status = 0x90 | (rwflag ^ 0x100);
929 MFPDELAY();
930 dma_wd.dma_mode_status = 0x90 | rwflag;
931 MFPDELAY();
932
933 /* How many sectors for DMA */
934 dma_wd.fdc_acces_seccount = read_track ? SUDT->spt : 1;
935
936 udelay(25);
937
938 /* Start operation */
939 dma_wd.dma_mode_status = FDCSELREG_STP | rwflag;
940 udelay(25);
941 SET_IRQ_HANDLER( fd_rwsec_done );
942 dma_wd.fdc_acces_seccount =
943 (get_head_settle_flag() |
944 (rwflag ? FDCCMD_WRSEC : (FDCCMD_RDSEC | (read_track ? FDCCMDADD_M : 0))));
945
946 old_motoron = MotorOn;
947 MotorOn = 1;
948 NeedSeek = 1;
949 /* wait for interrupt */
950
951 if (read_track) {
952 /* If reading a whole track, wait about one disk rotation and
953 * then check if all sectors are read. The FDC will even
954 * search for the first non-existent sector and need 1 sec to
955 * recognise that it isn't present :-(
956 */
957 MultReadInProgress = 1;
958 mod_timer(&readtrack_timer,
959 /* 1 rot. + 5 rot.s if motor was off */
960 jiffies + HZ/5 + (old_motoron ? 0 : HZ));
961 }
962 start_timeout();
963 }
964
965
966 static void fd_readtrack_check( unsigned long dummy )
967 {
968 unsigned long flags, addr, addr2;
969
970 local_irq_save(flags);
971
972 if (!MultReadInProgress) {
973 /* This prevents a race condition that could arise if the
974 * interrupt is triggered while the calling of this timer
975 * callback function takes place. The IRQ function then has
976 * already cleared 'MultReadInProgress' when flow of control
977 * gets here.
978 */
979 local_irq_restore(flags);
980 return;
981 }
982
983 /* get the current DMA address */
984 /* ++ f.a. read twice to avoid being fooled by switcher */
985 addr = 0;
986 do {
987 addr2 = addr;
988 addr = dma_wd.dma_lo & 0xff;
989 MFPDELAY();
990 addr |= (dma_wd.dma_md & 0xff) << 8;
991 MFPDELAY();
992 if (ATARIHW_PRESENT( EXTD_DMA ))
993 addr |= (st_dma_ext_dmahi & 0xffff) << 16;
994 else
995 addr |= (dma_wd.dma_hi & 0xff) << 16;
996 MFPDELAY();
997 } while(addr != addr2);
998
999 if (addr >= PhysTrackBuffer + SUDT->spt*512) {
1000 /* already read enough data, force an FDC interrupt to stop
1001 * the read operation
1002 */
1003 SET_IRQ_HANDLER( NULL );
1004 MultReadInProgress = 0;
1005 local_irq_restore(flags);
1006 DPRINT(("fd_readtrack_check(): done\n"));
1007 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1008 udelay(25);
1009
1010 /* No error until now -- the FDC would have interrupted
1011 * otherwise!
1012 */
1013 fd_rwsec_done1(0);
1014 }
1015 else {
1016 /* not yet finished, wait another tenth rotation */
1017 local_irq_restore(flags);
1018 DPRINT(("fd_readtrack_check(): not yet finished\n"));
1019 mod_timer(&readtrack_timer, jiffies + HZ/5/10);
1020 }
1021 }
1022
1023
1024 static void fd_rwsec_done( int status )
1025 {
1026 DPRINT(("fd_rwsec_done()\n"));
1027
1028 if (read_track) {
1029 del_timer(&readtrack_timer);
1030 if (!MultReadInProgress)
1031 return;
1032 MultReadInProgress = 0;
1033 }
1034 fd_rwsec_done1(status);
1035 }
1036
1037 static void fd_rwsec_done1(int status)
1038 {
1039 unsigned int track;
1040
1041 stop_timeout();
1042
1043 /* Correct the track if stretch != 0 */
1044 if (SUDT->stretch) {
1045 track = FDC_READ( FDCREG_TRACK);
1046 MFPDELAY();
1047 FDC_WRITE( FDCREG_TRACK, track << SUDT->stretch);
1048 }
1049
1050 if (!UseTrackbuffer) {
1051 dma_wd.dma_mode_status = 0x90;
1052 MFPDELAY();
1053 if (!(dma_wd.dma_mode_status & 0x01)) {
1054 printk(KERN_ERR "fd%d: DMA error\n", SelectedDrive );
1055 goto err_end;
1056 }
1057 }
1058 MFPDELAY();
1059
1060 if (ReqCmd == WRITE && (status & FDCSTAT_WPROT)) {
1061 printk(KERN_NOTICE "fd%d: is write protected\n", SelectedDrive );
1062 goto err_end;
1063 }
1064 if ((status & FDCSTAT_RECNF) &&
1065 /* RECNF is no error after a multiple read when the FDC
1066 searched for a non-existent sector! */
1067 !(read_track && FDC_READ(FDCREG_SECTOR) > SUDT->spt)) {
1068 if (Probing) {
1069 if (SUDT > atari_disk_type) {
1070 if (SUDT[-1].blocks > ReqBlock) {
1071 /* try another disk type */
1072 SUDT--;
1073 set_capacity(unit[SelectedDrive].disk,
1074 SUDT->blocks);
1075 } else
1076 Probing = 0;
1077 }
1078 else {
1079 if (SUD.flags & FTD_MSG)
1080 printk(KERN_INFO "fd%d: Auto-detected floppy type %s\n",
1081 SelectedDrive, SUDT->name );
1082 Probing=0;
1083 }
1084 } else {
1085 /* record not found, but not probing. Maybe stretch wrong ? Restart probing */
1086 if (SUD.autoprobe) {
1087 SUDT = atari_disk_type + StartDiskType[DriveType];
1088 set_capacity(unit[SelectedDrive].disk,
1089 SUDT->blocks);
1090 Probing = 1;
1091 }
1092 }
1093 if (Probing) {
1094 if (ATARIHW_PRESENT(FDCSPEED)) {
1095 dma_wd.fdc_speed = SUDT->fdc_speed;
1096 MFPDELAY();
1097 }
1098 setup_req_params( SelectedDrive );
1099 BufferDrive = -1;
1100 do_fd_action( SelectedDrive );
1101 return;
1102 }
1103
1104 printk(KERN_ERR "fd%d: sector %d not found (side %d, track %d)\n",
1105 SelectedDrive, FDC_READ (FDCREG_SECTOR), ReqSide, ReqTrack );
1106 goto err_end;
1107 }
1108 if (status & FDCSTAT_CRC) {
1109 printk(KERN_ERR "fd%d: CRC error (side %d, track %d, sector %d)\n",
1110 SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) );
1111 goto err_end;
1112 }
1113 if (status & FDCSTAT_LOST) {
1114 printk(KERN_ERR "fd%d: lost data (side %d, track %d, sector %d)\n",
1115 SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) );
1116 goto err_end;
1117 }
1118
1119 Probing = 0;
1120
1121 if (ReqCmd == READ) {
1122 if (!read_track) {
1123 void *addr;
1124 addr = ATARIHW_PRESENT( EXTD_DMA ) ? ReqData : DMABuffer;
1125 dma_cache_maintenance( virt_to_phys(addr), 512, 0 );
1126 if (!ATARIHW_PRESENT( EXTD_DMA ))
1127 copy_buffer (addr, ReqData);
1128 } else {
1129 dma_cache_maintenance( PhysTrackBuffer, MaxSectors[DriveType] * 512, 0 );
1130 BufferDrive = SelectedDrive;
1131 BufferSide = ReqSide;
1132 BufferTrack = ReqTrack;
1133 copy_buffer (SECTOR_BUFFER (ReqSector), ReqData);
1134 }
1135 }
1136
1137 if (++ReqCnt < blk_rq_cur_sectors(fd_request)) {
1138 /* read next sector */
1139 setup_req_params( SelectedDrive );
1140 do_fd_action( SelectedDrive );
1141 }
1142 else {
1143 /* all sectors finished */
1144 fd_end_request_cur(0);
1145 redo_fd_request();
1146 }
1147 return;
1148
1149 err_end:
1150 BufferDrive = -1;
1151 fd_error();
1152 }
1153
1154
1155 static void fd_writetrack( void )
1156 {
1157 unsigned long paddr, flags;
1158 unsigned int track;
1159
1160 DPRINT(("fd_writetrack() Tr=%d Si=%d\n", ReqTrack, ReqSide ));
1161
1162 paddr = PhysTrackBuffer;
1163 dma_cache_maintenance( paddr, BUFFER_SIZE, 1 );
1164
1165 fd_select_side( ReqSide );
1166
1167 /* Cheat for track if stretch != 0 */
1168 if (SUDT->stretch) {
1169 track = FDC_READ( FDCREG_TRACK);
1170 MFPDELAY();
1171 FDC_WRITE(FDCREG_TRACK,track >> SUDT->stretch);
1172 }
1173 udelay(40);
1174
1175 /* Setup DMA */
1176 local_irq_save(flags);
1177 dma_wd.dma_lo = (unsigned char)paddr;
1178 MFPDELAY();
1179 paddr >>= 8;
1180 dma_wd.dma_md = (unsigned char)paddr;
1181 MFPDELAY();
1182 paddr >>= 8;
1183 if (ATARIHW_PRESENT( EXTD_DMA ))
1184 st_dma_ext_dmahi = (unsigned short)paddr;
1185 else
1186 dma_wd.dma_hi = (unsigned char)paddr;
1187 MFPDELAY();
1188 local_irq_restore(flags);
1189
1190 /* Clear FIFO and switch DMA to correct mode */
1191 dma_wd.dma_mode_status = 0x190;
1192 MFPDELAY();
1193 dma_wd.dma_mode_status = 0x90;
1194 MFPDELAY();
1195 dma_wd.dma_mode_status = 0x190;
1196 MFPDELAY();
1197
1198 /* How many sectors for DMA */
1199 dma_wd.fdc_acces_seccount = BUFFER_SIZE/512;
1200 udelay(40);
1201
1202 /* Start operation */
1203 dma_wd.dma_mode_status = FDCSELREG_STP | 0x100;
1204 udelay(40);
1205 SET_IRQ_HANDLER( fd_writetrack_done );
1206 dma_wd.fdc_acces_seccount = FDCCMD_WRTRA | get_head_settle_flag();
1207
1208 MotorOn = 1;
1209 start_timeout();
1210 /* wait for interrupt */
1211 }
1212
1213
1214 static void fd_writetrack_done( int status )
1215 {
1216 DPRINT(("fd_writetrack_done()\n"));
1217
1218 stop_timeout();
1219
1220 if (status & FDCSTAT_WPROT) {
1221 printk(KERN_NOTICE "fd%d: is write protected\n", SelectedDrive );
1222 goto err_end;
1223 }
1224 if (status & FDCSTAT_LOST) {
1225 printk(KERN_ERR "fd%d: lost data (side %d, track %d)\n",
1226 SelectedDrive, ReqSide, ReqTrack );
1227 goto err_end;
1228 }
1229
1230 wake_up( &format_wait );
1231 return;
1232
1233 err_end:
1234 fd_error();
1235 }
1236
1237 static void fd_times_out( unsigned long dummy )
1238 {
1239 atari_disable_irq( IRQ_MFP_FDC );
1240 if (!FloppyIRQHandler) goto end; /* int occurred after timer was fired, but
1241 * before we came here... */
1242
1243 SET_IRQ_HANDLER( NULL );
1244 /* If the timeout occurred while the readtrack_check timer was
1245 * active, we need to cancel it, else bad things will happen */
1246 if (UseTrackbuffer)
1247 del_timer( &readtrack_timer );
1248 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1249 udelay( 25 );
1250
1251 printk(KERN_ERR "floppy timeout\n" );
1252 fd_error();
1253 end:
1254 atari_enable_irq( IRQ_MFP_FDC );
1255 }
1256
1257
1258 /* The (noop) seek operation here is needed to make the WP bit in the
1259 * FDC status register accessible for check_change. If the last disk
1260 * operation would have been a RDSEC, this bit would always read as 0
1261 * no matter what :-( To save time, the seek goes to the track we're
1262 * already on.
1263 */
1264
1265 static void finish_fdc( void )
1266 {
1267 if (!NeedSeek) {
1268 finish_fdc_done( 0 );
1269 }
1270 else {
1271 DPRINT(("finish_fdc: dummy seek started\n"));
1272 FDC_WRITE (FDCREG_DATA, SUD.track);
1273 SET_IRQ_HANDLER( finish_fdc_done );
1274 FDC_WRITE (FDCREG_CMD, FDCCMD_SEEK);
1275 MotorOn = 1;
1276 start_timeout();
1277 /* we must wait for the IRQ here, because the ST-DMA
1278 is released immediately afterwards and the interrupt
1279 may be delivered to the wrong driver. */
1280 }
1281 }
1282
1283
1284 static void finish_fdc_done( int dummy )
1285 {
1286 unsigned long flags;
1287
1288 DPRINT(("finish_fdc_done entered\n"));
1289 stop_timeout();
1290 NeedSeek = 0;
1291
1292 if (timer_pending(&fd_timer) && time_before(fd_timer.expires, jiffies + 5))
1293 /* If the check for a disk change is done too early after this
1294 * last seek command, the WP bit still reads wrong :-((
1295 */
1296 mod_timer(&fd_timer, jiffies + 5);
1297 else
1298 start_check_change_timer();
1299 start_motor_off_timer();
1300
1301 local_irq_save(flags);
1302 stdma_release();
1303 fdc_busy = 0;
1304 wake_up( &fdc_wait );
1305 local_irq_restore(flags);
1306
1307 DPRINT(("finish_fdc() finished\n"));
1308 }
1309
1310 /* The detection of disk changes is a dark chapter in Atari history :-(
1311 * Because the "Drive ready" signal isn't present in the Atari
1312 * hardware, one has to rely on the "Write Protect". This works fine,
1313 * as long as no write protected disks are used. TOS solves this
1314 * problem by introducing tri-state logic ("maybe changed") and
1315 * looking at the serial number in block 0. This isn't possible for
1316 * Linux, since the floppy driver can't make assumptions about the
1317 * filesystem used on the disk and thus the contents of block 0. I've
1318 * chosen the method to always say "The disk was changed" if it is
1319 * unsure whether it was. This implies that every open or mount
1320 * invalidates the disk buffers if you work with write protected
1321 * disks. But at least this is better than working with incorrect data
1322 * due to unrecognised disk changes.
1323 */
1324
1325 static int check_floppy_change(struct gendisk *disk)
1326 {
1327 struct atari_floppy_struct *p = disk->private_data;
1328 unsigned int drive = p - unit;
1329 if (test_bit (drive, &fake_change)) {
1330 /* simulated change (e.g. after formatting) */
1331 return 1;
1332 }
1333 if (test_bit (drive, &changed_floppies)) {
1334 /* surely changed (the WP signal changed at least once) */
1335 return 1;
1336 }
1337 if (UD.wpstat) {
1338 /* WP is on -> could be changed: to be sure, buffers should be
1339 * invalidated...
1340 */
1341 return 1;
1342 }
1343
1344 return 0;
1345 }
1346
1347 static int floppy_revalidate(struct gendisk *disk)
1348 {
1349 struct atari_floppy_struct *p = disk->private_data;
1350 unsigned int drive = p - unit;
1351
1352 if (test_bit(drive, &changed_floppies) ||
1353 test_bit(drive, &fake_change) ||
1354 p->disktype == 0) {
1355 if (UD.flags & FTD_MSG)
1356 printk(KERN_ERR "floppy: clear format %p!\n", UDT);
1357 BufferDrive = -1;
1358 clear_bit(drive, &fake_change);
1359 clear_bit(drive, &changed_floppies);
1360 /* MSch: clearing geometry makes sense only for autoprobe
1361 formats, for 'permanent user-defined' parameter:
1362 restore default_params[] here if flagged valid! */
1363 if (default_params[drive].blocks == 0)
1364 UDT = NULL;
1365 else
1366 UDT = &default_params[drive];
1367 }
1368 return 0;
1369 }
1370
1371
1372 /* This sets up the global variables describing the current request. */
1373
1374 static void setup_req_params( int drive )
1375 {
1376 int block = ReqBlock + ReqCnt;
1377
1378 ReqTrack = block / UDT->spt;
1379 ReqSector = block - ReqTrack * UDT->spt + 1;
1380 ReqSide = ReqTrack & 1;
1381 ReqTrack >>= 1;
1382 ReqData = ReqBuffer + 512 * ReqCnt;
1383
1384 if (UseTrackbuffer)
1385 read_track = (ReqCmd == READ && fd_request->errors == 0);
1386 else
1387 read_track = 0;
1388
1389 DPRINT(("Request params: Si=%d Tr=%d Se=%d Data=%08lx\n",ReqSide,
1390 ReqTrack, ReqSector, (unsigned long)ReqData ));
1391 }
1392
1393
1394 static void redo_fd_request(void)
1395 {
1396 int drive, type;
1397 struct atari_floppy_struct *floppy;
1398
1399 DPRINT(("redo_fd_request: fd_request=%p dev=%s fd_request->sector=%ld\n",
1400 fd_request, fd_request ? fd_request->rq_disk->disk_name : "",
1401 fd_request ? blk_rq_pos(fd_request) : 0 ));
1402
1403 IsFormatting = 0;
1404
1405 repeat:
1406 if (!fd_request) {
1407 fd_request = blk_fetch_request(floppy_queue);
1408 if (!fd_request)
1409 goto the_end;
1410 }
1411
1412 floppy = fd_request->rq_disk->private_data;
1413 drive = floppy - unit;
1414 type = floppy->type;
1415
1416 if (!UD.connected) {
1417 /* drive not connected */
1418 printk(KERN_ERR "Unknown Device: fd%d\n", drive );
1419 fd_end_request_cur(-EIO);
1420 goto repeat;
1421 }
1422
1423 if (type == 0) {
1424 if (!UDT) {
1425 Probing = 1;
1426 UDT = atari_disk_type + StartDiskType[DriveType];
1427 set_capacity(floppy->disk, UDT->blocks);
1428 UD.autoprobe = 1;
1429 }
1430 }
1431 else {
1432 /* user supplied disk type */
1433 if (--type >= NUM_DISK_MINORS) {
1434 printk(KERN_WARNING "fd%d: invalid disk format", drive );
1435 fd_end_request_cur(-EIO);
1436 goto repeat;
1437 }
1438 if (minor2disktype[type].drive_types > DriveType) {
1439 printk(KERN_WARNING "fd%d: unsupported disk format", drive );
1440 fd_end_request_cur(-EIO);
1441 goto repeat;
1442 }
1443 type = minor2disktype[type].index;
1444 UDT = &atari_disk_type[type];
1445 set_capacity(floppy->disk, UDT->blocks);
1446 UD.autoprobe = 0;
1447 }
1448
1449 if (blk_rq_pos(fd_request) + 1 > UDT->blocks) {
1450 fd_end_request_cur(-EIO);
1451 goto repeat;
1452 }
1453
1454 /* stop deselect timer */
1455 del_timer( &motor_off_timer );
1456
1457 ReqCnt = 0;
1458 ReqCmd = rq_data_dir(fd_request);
1459 ReqBlock = blk_rq_pos(fd_request);
1460 ReqBuffer = fd_request->buffer;
1461 setup_req_params( drive );
1462 do_fd_action( drive );
1463
1464 return;
1465
1466 the_end:
1467 finish_fdc();
1468 }
1469
1470
1471 void do_fd_request(struct request_queue * q)
1472 {
1473 DPRINT(("do_fd_request for pid %d\n",current->pid));
1474 while( fdc_busy ) sleep_on( &fdc_wait );
1475 fdc_busy = 1;
1476 stdma_lock(floppy_irq, NULL);
1477
1478 atari_disable_irq( IRQ_MFP_FDC );
1479 redo_fd_request();
1480 atari_enable_irq( IRQ_MFP_FDC );
1481 }
1482
1483 static int fd_ioctl(struct block_device *bdev, fmode_t mode,
1484 unsigned int cmd, unsigned long param)
1485 {
1486 struct gendisk *disk = bdev->bd_disk;
1487 struct atari_floppy_struct *floppy = disk->private_data;
1488 int drive = floppy - unit;
1489 int type = floppy->type;
1490 struct atari_format_descr fmt_desc;
1491 struct atari_disk_type *dtp;
1492 struct floppy_struct getprm;
1493 int settype;
1494 struct floppy_struct setprm;
1495 void __user *argp = (void __user *)param;
1496
1497 switch (cmd) {
1498 case FDGETPRM:
1499 if (type) {
1500 if (--type >= NUM_DISK_MINORS)
1501 return -ENODEV;
1502 if (minor2disktype[type].drive_types > DriveType)
1503 return -ENODEV;
1504 type = minor2disktype[type].index;
1505 dtp = &atari_disk_type[type];
1506 if (UD.flags & FTD_MSG)
1507 printk (KERN_ERR "floppy%d: found dtp %p name %s!\n",
1508 drive, dtp, dtp->name);
1509 }
1510 else {
1511 if (!UDT)
1512 return -ENXIO;
1513 else
1514 dtp = UDT;
1515 }
1516 memset((void *)&getprm, 0, sizeof(getprm));
1517 getprm.size = dtp->blocks;
1518 getprm.sect = dtp->spt;
1519 getprm.head = 2;
1520 getprm.track = dtp->blocks/dtp->spt/2;
1521 getprm.stretch = dtp->stretch;
1522 if (copy_to_user(argp, &getprm, sizeof(getprm)))
1523 return -EFAULT;
1524 return 0;
1525 }
1526 switch (cmd) {
1527 case FDSETPRM:
1528 case FDDEFPRM:
1529 /*
1530 * MSch 7/96: simple 'set geometry' case: just set the
1531 * 'default' device params (minor == 0).
1532 * Currently, the drive geometry is cleared after each
1533 * disk change and subsequent revalidate()! simple
1534 * implementation of FDDEFPRM: save geometry from a
1535 * FDDEFPRM call and restore it in floppy_revalidate() !
1536 */
1537
1538 /* get the parameters from user space */
1539 if (floppy->ref != 1 && floppy->ref != -1)
1540 return -EBUSY;
1541 if (copy_from_user(&setprm, argp, sizeof(setprm)))
1542 return -EFAULT;
1543 /*
1544 * first of all: check for floppy change and revalidate,
1545 * or the next access will revalidate - and clear UDT :-(
1546 */
1547
1548 if (check_floppy_change(disk))
1549 floppy_revalidate(disk);
1550
1551 if (UD.flags & FTD_MSG)
1552 printk (KERN_INFO "floppy%d: setting size %d spt %d str %d!\n",
1553 drive, setprm.size, setprm.sect, setprm.stretch);
1554
1555 /* what if type > 0 here? Overwrite specified entry ? */
1556 if (type) {
1557 /* refuse to re-set a predefined type for now */
1558 redo_fd_request();
1559 return -EINVAL;
1560 }
1561
1562 /*
1563 * type == 0: first look for a matching entry in the type list,
1564 * and set the UD.disktype field to use the perdefined entry.
1565 * TODO: add user-defined format to head of autoprobe list ?
1566 * Useful to include the user-type for future autodetection!
1567 */
1568
1569 for (settype = 0; settype < NUM_DISK_MINORS; settype++) {
1570 int setidx = 0;
1571 if (minor2disktype[settype].drive_types > DriveType) {
1572 /* skip this one, invalid for drive ... */
1573 continue;
1574 }
1575 setidx = minor2disktype[settype].index;
1576 dtp = &atari_disk_type[setidx];
1577
1578 /* found matching entry ?? */
1579 if ( dtp->blocks == setprm.size
1580 && dtp->spt == setprm.sect
1581 && dtp->stretch == setprm.stretch ) {
1582 if (UD.flags & FTD_MSG)
1583 printk (KERN_INFO "floppy%d: setting %s %p!\n",
1584 drive, dtp->name, dtp);
1585 UDT = dtp;
1586 set_capacity(floppy->disk, UDT->blocks);
1587
1588 if (cmd == FDDEFPRM) {
1589 /* save settings as permanent default type */
1590 default_params[drive].name = dtp->name;
1591 default_params[drive].spt = dtp->spt;
1592 default_params[drive].blocks = dtp->blocks;
1593 default_params[drive].fdc_speed = dtp->fdc_speed;
1594 default_params[drive].stretch = dtp->stretch;
1595 }
1596
1597 return 0;
1598 }
1599
1600 }
1601
1602 /* no matching disk type found above - setting user_params */
1603
1604 if (cmd == FDDEFPRM) {
1605 /* set permanent type */
1606 dtp = &default_params[drive];
1607 } else
1608 /* set user type (reset by disk change!) */
1609 dtp = &user_params[drive];
1610
1611 dtp->name = "user format";
1612 dtp->blocks = setprm.size;
1613 dtp->spt = setprm.sect;
1614 if (setprm.sect > 14)
1615 dtp->fdc_speed = 3;
1616 else
1617 dtp->fdc_speed = 0;
1618 dtp->stretch = setprm.stretch;
1619
1620 if (UD.flags & FTD_MSG)
1621 printk (KERN_INFO "floppy%d: blk %d spt %d str %d!\n",
1622 drive, dtp->blocks, dtp->spt, dtp->stretch);
1623
1624 /* sanity check */
1625 if (setprm.track != dtp->blocks/dtp->spt/2 ||
1626 setprm.head != 2) {
1627 redo_fd_request();
1628 return -EINVAL;
1629 }
1630
1631 UDT = dtp;
1632 set_capacity(floppy->disk, UDT->blocks);
1633
1634 return 0;
1635 case FDMSGON:
1636 UD.flags |= FTD_MSG;
1637 return 0;
1638 case FDMSGOFF:
1639 UD.flags &= ~FTD_MSG;
1640 return 0;
1641 case FDSETEMSGTRESH:
1642 return -EINVAL;
1643 case FDFMTBEG:
1644 return 0;
1645 case FDFMTTRK:
1646 if (floppy->ref != 1 && floppy->ref != -1)
1647 return -EBUSY;
1648 if (copy_from_user(&fmt_desc, argp, sizeof(fmt_desc)))
1649 return -EFAULT;
1650 return do_format(drive, type, &fmt_desc);
1651 case FDCLRPRM:
1652 UDT = NULL;
1653 /* MSch: invalidate default_params */
1654 default_params[drive].blocks = 0;
1655 set_capacity(floppy->disk, MAX_DISK_SIZE * 2);
1656 case FDFMTEND:
1657 case FDFLUSH:
1658 /* invalidate the buffer track to force a reread */
1659 BufferDrive = -1;
1660 set_bit(drive, &fake_change);
1661 check_disk_change(bdev);
1662 return 0;
1663 default:
1664 return -EINVAL;
1665 }
1666 }
1667
1668
1669 /* Initialize the 'unit' variable for drive 'drive' */
1670
1671 static void __init fd_probe( int drive )
1672 {
1673 UD.connected = 0;
1674 UDT = NULL;
1675
1676 if (!fd_test_drive_present( drive ))
1677 return;
1678
1679 UD.connected = 1;
1680 UD.track = 0;
1681 switch( UserSteprate[drive] ) {
1682 case 2:
1683 UD.steprate = FDCSTEP_2;
1684 break;
1685 case 3:
1686 UD.steprate = FDCSTEP_3;
1687 break;
1688 case 6:
1689 UD.steprate = FDCSTEP_6;
1690 break;
1691 case 12:
1692 UD.steprate = FDCSTEP_12;
1693 break;
1694 default: /* should be -1 for "not set by user" */
1695 if (ATARIHW_PRESENT( FDCSPEED ) || MACH_IS_MEDUSA)
1696 UD.steprate = FDCSTEP_3;
1697 else
1698 UD.steprate = FDCSTEP_6;
1699 break;
1700 }
1701 MotorOn = 1; /* from probe restore operation! */
1702 }
1703
1704
1705 /* This function tests the physical presence of a floppy drive (not
1706 * whether a disk is inserted). This is done by issuing a restore
1707 * command, waiting max. 2 seconds (that should be enough to move the
1708 * head across the whole disk) and looking at the state of the "TR00"
1709 * signal. This should now be raised if there is a drive connected
1710 * (and there is no hardware failure :-) Otherwise, the drive is
1711 * declared absent.
1712 */
1713
1714 static int __init fd_test_drive_present( int drive )
1715 {
1716 unsigned long timeout;
1717 unsigned char status;
1718 int ok;
1719
1720 if (drive >= (MACH_IS_FALCON ? 1 : 2)) return( 0 );
1721 fd_select_drive( drive );
1722
1723 /* disable interrupt temporarily */
1724 atari_turnoff_irq( IRQ_MFP_FDC );
1725 FDC_WRITE (FDCREG_TRACK, 0xff00);
1726 FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | FDCCMDADD_H | FDCSTEP_6 );
1727
1728 timeout = jiffies + 2*HZ+HZ/2;
1729 while (time_before(jiffies, timeout))
1730 if (!(st_mfp.par_dt_reg & 0x20))
1731 break;
1732
1733 status = FDC_READ( FDCREG_STATUS );
1734 ok = (status & FDCSTAT_TR00) != 0;
1735
1736 /* force interrupt to abort restore operation (FDC would try
1737 * about 50 seconds!) */
1738 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1739 udelay(500);
1740 status = FDC_READ( FDCREG_STATUS );
1741 udelay(20);
1742
1743 if (ok) {
1744 /* dummy seek command to make WP bit accessible */
1745 FDC_WRITE( FDCREG_DATA, 0 );
1746 FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK );
1747 while( st_mfp.par_dt_reg & 0x20 )
1748 ;
1749 status = FDC_READ( FDCREG_STATUS );
1750 }
1751
1752 atari_turnon_irq( IRQ_MFP_FDC );
1753 return( ok );
1754 }
1755
1756
1757 /* Look how many and which kind of drives are connected. If there are
1758 * floppies, additionally start the disk-change and motor-off timers.
1759 */
1760
1761 static void __init config_types( void )
1762 {
1763 int drive, cnt = 0;
1764
1765 /* for probing drives, set the FDC speed to 8 MHz */
1766 if (ATARIHW_PRESENT(FDCSPEED))
1767 dma_wd.fdc_speed = 0;
1768
1769 printk(KERN_INFO "Probing floppy drive(s):\n");
1770 for( drive = 0; drive < FD_MAX_UNITS; drive++ ) {
1771 fd_probe( drive );
1772 if (UD.connected) {
1773 printk(KERN_INFO "fd%d\n", drive);
1774 ++cnt;
1775 }
1776 }
1777
1778 if (FDC_READ( FDCREG_STATUS ) & FDCSTAT_BUSY) {
1779 /* If FDC is still busy from probing, give it another FORCI
1780 * command to abort the operation. If this isn't done, the FDC
1781 * will interrupt later and its IRQ line stays low, because
1782 * the status register isn't read. And this will block any
1783 * interrupts on this IRQ line :-(
1784 */
1785 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1786 udelay(500);
1787 FDC_READ( FDCREG_STATUS );
1788 udelay(20);
1789 }
1790
1791 if (cnt > 0) {
1792 start_motor_off_timer();
1793 if (cnt == 1) fd_select_drive( 0 );
1794 start_check_change_timer();
1795 }
1796 }
1797
1798 /*
1799 * floppy_open check for aliasing (/dev/fd0 can be the same as
1800 * /dev/PS0 etc), and disallows simultaneous access to the same
1801 * drive with different device numbers.
1802 */
1803
1804 static int floppy_open(struct block_device *bdev, fmode_t mode)
1805 {
1806 struct atari_floppy_struct *p = bdev->bd_disk->private_data;
1807 int type = MINOR(bdev->bd_dev) >> 2;
1808
1809 DPRINT(("fd_open: type=%d\n",type));
1810 if (p->ref && p->type != type)
1811 return -EBUSY;
1812
1813 if (p->ref == -1 || (p->ref && mode & FMODE_EXCL))
1814 return -EBUSY;
1815
1816 if (mode & FMODE_EXCL)
1817 p->ref = -1;
1818 else
1819 p->ref++;
1820
1821 p->type = type;
1822
1823 if (mode & FMODE_NDELAY)
1824 return 0;
1825
1826 if (mode & (FMODE_READ|FMODE_WRITE)) {
1827 check_disk_change(bdev);
1828 if (mode & FMODE_WRITE) {
1829 if (p->wpstat) {
1830 if (p->ref < 0)
1831 p->ref = 0;
1832 else
1833 p->ref--;
1834 return -EROFS;
1835 }
1836 }
1837 }
1838 return 0;
1839 }
1840
1841
1842 static int floppy_release(struct gendisk *disk, fmode_t mode)
1843 {
1844 struct atari_floppy_struct *p = disk->private_data;
1845 if (p->ref < 0)
1846 p->ref = 0;
1847 else if (!p->ref--) {
1848 printk(KERN_ERR "floppy_release with fd_ref == 0");
1849 p->ref = 0;
1850 }
1851 return 0;
1852 }
1853
1854 static const struct block_device_operations floppy_fops = {
1855 .owner = THIS_MODULE,
1856 .open = floppy_open,
1857 .release = floppy_release,
1858 .locked_ioctl = fd_ioctl,
1859 .media_changed = check_floppy_change,
1860 .revalidate_disk= floppy_revalidate,
1861 };
1862
1863 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
1864 {
1865 int drive = *part & 3;
1866 int type = *part >> 2;
1867 if (drive >= FD_MAX_UNITS || type > NUM_DISK_MINORS)
1868 return NULL;
1869 *part = 0;
1870 return get_disk(unit[drive].disk);
1871 }
1872
1873 static int __init atari_floppy_init (void)
1874 {
1875 int i;
1876
1877 if (!MACH_IS_ATARI)
1878 /* Amiga, Mac, ... don't have Atari-compatible floppy :-) */
1879 return -ENODEV;
1880
1881 if (register_blkdev(FLOPPY_MAJOR,"fd"))
1882 return -EBUSY;
1883
1884 for (i = 0; i < FD_MAX_UNITS; i++) {
1885 unit[i].disk = alloc_disk(1);
1886 if (!unit[i].disk)
1887 goto Enomem;
1888 }
1889
1890 if (UseTrackbuffer < 0)
1891 /* not set by user -> use default: for now, we turn
1892 track buffering off for all Medusas, though it
1893 could be used with ones that have a counter
1894 card. But the test is too hard :-( */
1895 UseTrackbuffer = !MACH_IS_MEDUSA;
1896
1897 /* initialize variables */
1898 SelectedDrive = -1;
1899 BufferDrive = -1;
1900
1901 DMABuffer = atari_stram_alloc(BUFFER_SIZE+512, "ataflop");
1902 if (!DMABuffer) {
1903 printk(KERN_ERR "atari_floppy_init: cannot get dma buffer\n");
1904 goto Enomem;
1905 }
1906 TrackBuffer = DMABuffer + 512;
1907 PhysDMABuffer = virt_to_phys(DMABuffer);
1908 PhysTrackBuffer = virt_to_phys(TrackBuffer);
1909 BufferDrive = BufferSide = BufferTrack = -1;
1910
1911 floppy_queue = blk_init_queue(do_fd_request, &ataflop_lock);
1912 if (!floppy_queue)
1913 goto Enomem;
1914
1915 for (i = 0; i < FD_MAX_UNITS; i++) {
1916 unit[i].track = -1;
1917 unit[i].flags = 0;
1918 unit[i].disk->major = FLOPPY_MAJOR;
1919 unit[i].disk->first_minor = i;
1920 sprintf(unit[i].disk->disk_name, "fd%d", i);
1921 unit[i].disk->fops = &floppy_fops;
1922 unit[i].disk->private_data = &unit[i];
1923 unit[i].disk->queue = floppy_queue;
1924 set_capacity(unit[i].disk, MAX_DISK_SIZE * 2);
1925 add_disk(unit[i].disk);
1926 }
1927
1928 blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
1929 floppy_find, NULL, NULL);
1930
1931 printk(KERN_INFO "Atari floppy driver: max. %cD, %strack buffering\n",
1932 DriveType == 0 ? 'D' : DriveType == 1 ? 'H' : 'E',
1933 UseTrackbuffer ? "" : "no ");
1934 config_types();
1935
1936 return 0;
1937 Enomem:
1938 while (i--)
1939 put_disk(unit[i].disk);
1940 if (floppy_queue)
1941 blk_cleanup_queue(floppy_queue);
1942 unregister_blkdev(FLOPPY_MAJOR, "fd");
1943 return -ENOMEM;
1944 }
1945
1946 #ifndef MODULE
1947 static int __init atari_floppy_setup(char *str)
1948 {
1949 int ints[3 + FD_MAX_UNITS];
1950 int i;
1951
1952 if (!MACH_IS_ATARI)
1953 return 0;
1954
1955 str = get_options(str, 3 + FD_MAX_UNITS, ints);
1956
1957 if (ints[0] < 1) {
1958 printk(KERN_ERR "ataflop_setup: no arguments!\n" );
1959 return 0;
1960 }
1961 else if (ints[0] > 2+FD_MAX_UNITS) {
1962 printk(KERN_ERR "ataflop_setup: too many arguments\n" );
1963 }
1964
1965 if (ints[1] < 0 || ints[1] > 2)
1966 printk(KERN_ERR "ataflop_setup: bad drive type\n" );
1967 else
1968 DriveType = ints[1];
1969
1970 if (ints[0] >= 2)
1971 UseTrackbuffer = (ints[2] > 0);
1972
1973 for( i = 3; i <= ints[0] && i-3 < FD_MAX_UNITS; ++i ) {
1974 if (ints[i] != 2 && ints[i] != 3 && ints[i] != 6 && ints[i] != 12)
1975 printk(KERN_ERR "ataflop_setup: bad steprate\n" );
1976 else
1977 UserSteprate[i-3] = ints[i];
1978 }
1979 return 1;
1980 }
1981
1982 __setup("floppy=", atari_floppy_setup);
1983 #endif
1984
1985 static void __exit atari_floppy_exit(void)
1986 {
1987 int i;
1988 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
1989 for (i = 0; i < FD_MAX_UNITS; i++) {
1990 del_gendisk(unit[i].disk);
1991 put_disk(unit[i].disk);
1992 }
1993 unregister_blkdev(FLOPPY_MAJOR, "fd");
1994
1995 blk_cleanup_queue(floppy_queue);
1996 del_timer_sync(&fd_timer);
1997 atari_stram_free( DMABuffer );
1998 }
1999
2000 module_init(atari_floppy_init)
2001 module_exit(atari_floppy_exit)
2002
2003 MODULE_LICENSE("GPL");