1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * drivers/block/ataflop.c
4 *
5 * Copyright (C) 1993 Greg Harp
6 * Atari Support by Bjoern Brauel, Roman Hodek
7 *
8 * Big cleanup Sep 11..14 1994 Roman Hodek:
9 * - Driver now works interrupt driven
10 * - Support for two drives; should work, but I cannot test that :-(
11 * - Reading is done in whole tracks and buffered to speed up things
12 * - Disk change detection and drive deselecting after motor-off
13 * similar to TOS
14 * - Autodetection of disk format (DD/HD); untested yet, because I
15 * don't have an HD drive :-(
16 *
17 * Fixes Nov 13 1994 Martin Schaller:
18 * - Autodetection works now
19 * - Support for 5 1/4'' disks
20 * - Removed drive type (unknown on atari)
21 * - Do seeks with 8 Mhz
22 *
23 * Changes by Andreas Schwab:
24 * - After errors in multiple read mode try again reading single sectors
25 * (Feb 1995):
26 * - Clean up error handling
27 * - Set blk_size for proper size checking
28 * - Initialize track register when testing presence of floppy
29 * - Implement some ioctl's
30 *
31 * Changes by Torsten Lang:
32 * - When probing the floppies we should add the FDCCMDADD_H flag since
33 * the FDC will otherwise wait forever when no disk is inserted...
34 *
35 * ++ Freddi Aschwanden (fa) 20.9.95 fixes for medusa:
36 * - MFPDELAY() after each FDC access -> atari
37 * - more/other disk formats
38 * - DMA to the block buffer directly if we have a 32bit DMA
39 * - for medusa, the step rate is always 3ms
40 * - on medusa, use only cache_push()
41 * Roman:
42 * - Make disk format numbering independent from minors
43 * - Let user set max. supported drive type (speeds up format
44 * detection, saves buffer space)
45 *
46 * Roman 10/15/95:
47 * - implement some more ioctls
48 * - disk formatting
49 *
50 * Andreas 95/12/12:
51 * - increase gap size at start of track for HD/ED disks
52 *
53 * Michael (MSch) 11/07/96:
54 * - implemented FDSETPRM and FDDEFPRM ioctl
55 *
56 * Andreas (97/03/19):
57 * - implemented missing BLK* ioctls
58 *
59 * Things left to do:
60 * - Formatting
61 * - Maybe a better strategy for disk change detection (does anyone
62 * know one?)
63 */
64
65 #include <linux/module.h>
66
67 #include <linux/fd.h>
68 #include <linux/delay.h>
69 #include <linux/init.h>
70 #include <linux/blk-mq.h>
71 #include <linux/major.h>
72 #include <linux/mutex.h>
73 #include <linux/completion.h>
74 #include <linux/wait.h>
75
76 #include <asm/atariints.h>
77 #include <asm/atari_stdma.h>
78 #include <asm/atari_stram.h>
79
80 #define FD_MAX_UNITS 2
81
82 #undef DEBUG
83
84 static DEFINE_MUTEX(ataflop_mutex);
85 static struct request *fd_request;
86
87 /*
88 * WD1772 stuff
89 */
90
91 /* register codes */
92
93 #define FDCSELREG_STP (0x80) /* command/status register */
94 #define FDCSELREG_TRA (0x82) /* track register */
95 #define FDCSELREG_SEC (0x84) /* sector register */
96 #define FDCSELREG_DTA (0x86) /* data register */
97
98 /* register names for FDC_READ/WRITE macros */
99
100 #define FDCREG_CMD 0
101 #define FDCREG_STATUS 0
102 #define FDCREG_TRACK 2
103 #define FDCREG_SECTOR 4
104 #define FDCREG_DATA 6
105
106 /* command opcodes */
107
108 #define FDCCMD_RESTORE (0x00) /* - */
109 #define FDCCMD_SEEK (0x10) /* | */
110 #define FDCCMD_STEP (0x20) /* | TYP 1 Commands */
111 #define FDCCMD_STIN (0x40) /* | */
112 #define FDCCMD_STOT (0x60) /* - */
113 #define FDCCMD_RDSEC (0x80) /* - TYP 2 Commands */
114 #define FDCCMD_WRSEC (0xa0) /* - " */
115 #define FDCCMD_RDADR (0xc0) /* - */
116 #define FDCCMD_RDTRA (0xe0) /* | TYP 3 Commands */
117 #define FDCCMD_WRTRA (0xf0) /* - */
118 #define FDCCMD_FORCI (0xd0) /* - TYP 4 Command */
119
120 /* command modifier bits */
121
122 #define FDCCMDADD_SR6 (0x00) /* step rate settings */
123 #define FDCCMDADD_SR12 (0x01)
124 #define FDCCMDADD_SR2 (0x02)
125 #define FDCCMDADD_SR3 (0x03)
126 #define FDCCMDADD_V (0x04) /* verify */
127 #define FDCCMDADD_H (0x08) /* wait for spin-up */
128 #define FDCCMDADD_U (0x10) /* update track register */
129 #define FDCCMDADD_M (0x10) /* multiple sector access */
130 #define FDCCMDADD_E (0x04) /* head settling flag */
131 #define FDCCMDADD_P (0x02) /* precompensation off */
132 #define FDCCMDADD_A0 (0x01) /* DAM flag */
133
134 /* status register bits */
135
136 #define FDCSTAT_MOTORON (0x80) /* motor on */
137 #define FDCSTAT_WPROT (0x40) /* write protected (FDCCMD_WR*) */
138 #define FDCSTAT_SPINUP (0x20) /* motor speed stable (Type I) */
139 #define FDCSTAT_DELDAM (0x20) /* sector has deleted DAM (Type II+III) */
140 #define FDCSTAT_RECNF (0x10) /* record not found */
141 #define FDCSTAT_CRC (0x08) /* CRC error */
142 #define FDCSTAT_TR00 (0x04) /* Track 00 flag (Type I) */
143 #define FDCSTAT_LOST (0x04) /* Lost Data (Type II+III) */
144 #define FDCSTAT_IDX (0x02) /* Index status (Type I) */
145 #define FDCSTAT_DRQ (0x02) /* DRQ status (Type II+III) */
146 #define FDCSTAT_BUSY (0x01) /* FDC is busy */
147
148
149 /* PSG Port A Bit Nr 0 .. Side Sel .. 0 -> Side 1 1 -> Side 2 */
150 #define DSKSIDE (0x01)
151
152 #define DSKDRVNONE (0x06)
153 #define DSKDRV0 (0x02)
154 #define DSKDRV1 (0x04)
155
156 /* step rates */
157 #define FDCSTEP_6 0x00
158 #define FDCSTEP_12 0x01
159 #define FDCSTEP_2 0x02
160 #define FDCSTEP_3 0x03
161
162 struct atari_format_descr {
163 int track; /* to be formatted */
164 int head; /* "" "" */
165 int sect_offset; /* offset of first sector */
166 };
167
168 /* Disk types: DD, HD, ED */
169 static struct atari_disk_type {
170 const char *name;
171 unsigned spt; /* sectors per track */
172 unsigned blocks; /* total number of blocks */
173 unsigned fdc_speed; /* fdc_speed setting */
174 unsigned stretch; /* track doubling ? */
175 } atari_disk_type[] = {
176 { "d360", 9, 720, 0, 0}, /* 0: 360kB diskette */
177 { "D360", 9, 720, 0, 1}, /* 1: 360kb in 720k or 1.2MB drive */
178 { "D720", 9,1440, 0, 0}, /* 2: 720kb in 720k or 1.2MB drive */
179 { "D820", 10,1640, 0, 0}, /* 3: DD disk with 82 tracks/10 sectors */
180 /* formats above are probed for type DD */
181 #define MAX_TYPE_DD 3
182 { "h1200",15,2400, 3, 0}, /* 4: 1.2MB diskette */
183 { "H1440",18,2880, 3, 0}, /* 5: 1.4 MB diskette (HD) */
184 { "H1640",20,3280, 3, 0}, /* 6: 1.64MB diskette (fat HD) 82 tr 20 sec */
185 /* formats above are probed for types DD and HD */
186 #define MAX_TYPE_HD 6
187 { "E2880",36,5760, 3, 0}, /* 7: 2.8 MB diskette (ED) */
188 { "E3280",40,6560, 3, 0}, /* 8: 3.2 MB diskette (fat ED) 82 tr 40 sec */
189 /* formats above are probed for types DD, HD and ED */
190 #define MAX_TYPE_ED 8
191 /* types below are never autoprobed */
192 { "H1680",21,3360, 3, 0}, /* 9: 1.68MB diskette (fat HD) 80 tr 21 sec */
193 { "h410",10,820, 0, 1}, /* 10: 410k diskette 41 tr 10 sec, stretch */
194 { "h1476",18,2952, 3, 0}, /* 11: 1.48MB diskette 82 tr 18 sec */
195 { "H1722",21,3444, 3, 0}, /* 12: 1.72MB diskette 82 tr 21 sec */
196 { "h420",10,840, 0, 1}, /* 13: 420k diskette 42 tr 10 sec, stretch */
197 { "H830",10,1660, 0, 0}, /* 14: 820k diskette 83 tr 10 sec */
198 { "h1494",18,2952, 3, 0}, /* 15: 1.49MB diskette 83 tr 18 sec */
199 { "H1743",21,3486, 3, 0}, /* 16: 1.74MB diskette 83 tr 21 sec */
200 { "h880",11,1760, 0, 0}, /* 17: 880k diskette 80 tr 11 sec */
201 { "D1040",13,2080, 0, 0}, /* 18: 1.04MB diskette 80 tr 13 sec */
202 { "D1120",14,2240, 0, 0}, /* 19: 1.12MB diskette 80 tr 14 sec */
203 { "h1600",20,3200, 3, 0}, /* 20: 1.60MB diskette 80 tr 20 sec */
204 { "H1760",22,3520, 3, 0}, /* 21: 1.76MB diskette 80 tr 22 sec */
205 { "H1920",24,3840, 3, 0}, /* 22: 1.92MB diskette 80 tr 24 sec */
206 { "E3200",40,6400, 3, 0}, /* 23: 3.2MB diskette 80 tr 40 sec */
207 { "E3520",44,7040, 3, 0}, /* 24: 3.52MB diskette 80 tr 44 sec */
208 { "E3840",48,7680, 3, 0}, /* 25: 3.84MB diskette 80 tr 48 sec */
209 { "H1840",23,3680, 3, 0}, /* 26: 1.84MB diskette 80 tr 23 sec */
210 { "D800",10,1600, 0, 0}, /* 27: 800k diskette 80 tr 10 sec */
211 };
212
213 static int StartDiskType[] = {
214 MAX_TYPE_DD,
215 MAX_TYPE_HD,
216 MAX_TYPE_ED
217 };
218
219 #define TYPE_DD 0
220 #define TYPE_HD 1
221 #define TYPE_ED 2
222
223 static int DriveType = TYPE_HD;
224
225 static DEFINE_SPINLOCK(ataflop_lock);
226
227 /* Array for translating minors into disk formats */
228 static struct {
229 int index;
230 unsigned drive_types;
231 } minor2disktype[] = {
232 { 0, TYPE_DD }, /* 1: d360 */
233 { 4, TYPE_HD }, /* 2: h1200 */
234 { 1, TYPE_DD }, /* 3: D360 */
235 { 2, TYPE_DD }, /* 4: D720 */
236 { 1, TYPE_DD }, /* 5: h360 = D360 */
237 { 2, TYPE_DD }, /* 6: h720 = D720 */
238 { 5, TYPE_HD }, /* 7: H1440 */
239 { 7, TYPE_ED }, /* 8: E2880 */
240 /* some PC formats :-) */
241 { 8, TYPE_ED }, /* 9: E3280 <- was "CompaQ" == E2880 for PC */
242 { 5, TYPE_HD }, /* 10: h1440 = H1440 */
243 { 9, TYPE_HD }, /* 11: H1680 */
244 { 10, TYPE_DD }, /* 12: h410 */
245 { 3, TYPE_DD }, /* 13: H820 <- == D820, 82x10 */
246 { 11, TYPE_HD }, /* 14: h1476 */
247 { 12, TYPE_HD }, /* 15: H1722 */
248 { 13, TYPE_DD }, /* 16: h420 */
249 { 14, TYPE_DD }, /* 17: H830 */
250 { 15, TYPE_HD }, /* 18: h1494 */
251 { 16, TYPE_HD }, /* 19: H1743 */
252 { 17, TYPE_DD }, /* 20: h880 */
253 { 18, TYPE_DD }, /* 21: D1040 */
254 { 19, TYPE_DD }, /* 22: D1120 */
255 { 20, TYPE_HD }, /* 23: h1600 */
256 { 21, TYPE_HD }, /* 24: H1760 */
257 { 22, TYPE_HD }, /* 25: H1920 */
258 { 23, TYPE_ED }, /* 26: E3200 */
259 { 24, TYPE_ED }, /* 27: E3520 */
260 { 25, TYPE_ED }, /* 28: E3840 */
261 { 26, TYPE_HD }, /* 29: H1840 */
262 { 27, TYPE_DD }, /* 30: D800 */
263 { 6, TYPE_HD }, /* 31: H1640 <- was H1600 == h1600 for PC */
264 };
265
266 #define NUM_DISK_MINORS ARRAY_SIZE(minor2disktype)
267
268 /*
269 * Maximum disk size (in kilobytes). This default is used whenever the
270 * current disk size is unknown.
271 */
272 #define MAX_DISK_SIZE 3280
273
274 /*
275 * MSch: User-provided type information. 'drive' points to
276 * the respective entry of this array. Set by FDSETPRM ioctls.
277 */
278 static struct atari_disk_type user_params[FD_MAX_UNITS];
279
280 /*
281 * User-provided permanent type information. 'drive' points to
282 * the respective entry of this array. Set by FDDEFPRM ioctls,
283 * restored upon disk change by floppy_revalidate() if valid (as seen by
284 * default_params[].blocks > 0 - a bit in unit[].flags might be used for this?)
285 */
286 static struct atari_disk_type default_params[FD_MAX_UNITS];
287
288 /* current info on each unit */
289 static struct atari_floppy_struct {
290 int connected; /* !=0 : drive is connected */
291 int autoprobe; /* !=0 : do autoprobe */
292
293 struct atari_disk_type *disktype; /* current type of disk */
294
295 int track; /* current head position or -1 if
296 unknown */
297 unsigned int steprate; /* steprate setting */
298 unsigned int wpstat; /* current state of WP signal (for
299 disk change detection) */
300 int flags; /* flags */
301 struct gendisk *disk[NUM_DISK_MINORS];
302 bool registered[NUM_DISK_MINORS];
303 int ref;
304 int type;
305 struct blk_mq_tag_set tag_set;
306 int error_count;
307 } unit[FD_MAX_UNITS];
308
309 #define UD unit[drive]
310 #define UDT unit[drive].disktype
311 #define SUD unit[SelectedDrive]
312 #define SUDT unit[SelectedDrive].disktype
313
314
315 #define FDC_READ(reg) ({ \
316 /* unsigned long __flags; */ \
317 unsigned short __val; \
318 /* local_irq_save(__flags); */ \
319 dma_wd.dma_mode_status = 0x80 | (reg); \
320 udelay(25); \
321 __val = dma_wd.fdc_acces_seccount; \
322 MFPDELAY(); \
323 /* local_irq_restore(__flags); */ \
324 __val & 0xff; \
325 })
326
327 #define FDC_WRITE(reg,val) \
328 do { \
329 /* unsigned long __flags; */ \
330 /* local_irq_save(__flags); */ \
331 dma_wd.dma_mode_status = 0x80 | (reg); \
332 udelay(25); \
333 dma_wd.fdc_acces_seccount = (val); \
334 MFPDELAY(); \
335 /* local_irq_restore(__flags); */ \
336 } while(0)
337
338
339 /* Buffering variables:
340 * First, there is a DMA buffer in ST-RAM that is used for floppy DMA
341 * operations. Second, a track buffer is used to cache a whole track
342 * of the disk to save read operations. These are two separate buffers
343 * because that allows write operations without clearing the track buffer.
344 */
345
346 static int MaxSectors[] = {
347 11, 22, 44
348 };
349 static int BufferSize[] = {
350 15*512, 30*512, 60*512
351 };
352
353 #define BUFFER_SIZE (BufferSize[DriveType])
354
355 unsigned char *DMABuffer; /* buffer for writes */
356 static unsigned long PhysDMABuffer; /* physical address */
357
358 static int UseTrackbuffer = -1; /* Do track buffering? */
359 module_param(UseTrackbuffer, int, 0);
360
361 unsigned char *TrackBuffer; /* buffer for reads */
362 static unsigned long PhysTrackBuffer; /* physical address */
363 static int BufferDrive, BufferSide, BufferTrack;
364 static int read_track; /* non-zero if we are reading whole tracks */
365
366 #define SECTOR_BUFFER(sec) (TrackBuffer + ((sec)-1)*512)
367 #define IS_BUFFERED(drive,side,track) \
368 (BufferDrive == (drive) && BufferSide == (side) && BufferTrack == (track))
369
370 /*
371 * These are global variables, as that's the easiest way to give
372 * information to interrupts. They are the data used for the current
373 * request.
374 */
375 static int SelectedDrive = 0;
376 static int ReqCmd, ReqBlock;
377 static int ReqSide, ReqTrack, ReqSector, ReqCnt;
378 static int HeadSettleFlag = 0;
379 static unsigned char *ReqData, *ReqBuffer;
380 static int MotorOn = 0, MotorOffTrys;
381 static int IsFormatting = 0, FormatError;
382
383 static int UserSteprate[FD_MAX_UNITS] = { -1, -1 };
384 module_param_array(UserSteprate, int, NULL, 0);
385
386 static DECLARE_COMPLETION(format_wait);
387
388 static unsigned long changed_floppies = 0xff, fake_change = 0;
389 #define CHECK_CHANGE_DELAY HZ/2
390
391 #define FD_MOTOR_OFF_DELAY (3*HZ)
392 #define FD_MOTOR_OFF_MAXTRY (10*20)
393
394 #define FLOPPY_TIMEOUT (6*HZ)
395 #define RECALIBRATE_ERRORS 4 /* After this many errors the drive
396 * will be recalibrated. */
397 #define MAX_ERRORS 8 /* After this many errors the driver
398 * will give up. */
399
400
401 /*
402 * The driver is trying to determine the correct media format
403 * while Probing is set. fd_rwsec_done() clears it after a
404 * successful access.
405 */
406 static int Probing = 0;
407
408 /* This flag is set when a dummy seek is necessary to make the WP
409 * status bit accessible.
410 */
411 static int NeedSeek = 0;
412
413
414 #ifdef DEBUG
415 #define DPRINT(a) printk a
416 #else
417 #define DPRINT(a)
418 #endif
419
420 /***************************** Prototypes *****************************/
421
422 static void fd_select_side( int side );
423 static void fd_select_drive( int drive );
424 static void fd_deselect( void );
425 static void fd_motor_off_timer(struct timer_list *unused);
426 static void check_change(struct timer_list *unused);
427 static irqreturn_t floppy_irq (int irq, void *dummy);
428 static void fd_error( void );
429 static int do_format(int drive, int type, struct atari_format_descr *desc);
430 static void do_fd_action( int drive );
431 static void fd_calibrate( void );
432 static void fd_calibrate_done( int status );
433 static void fd_seek( void );
434 static void fd_seek_done( int status );
435 static void fd_rwsec( void );
436 static void fd_readtrack_check(struct timer_list *unused);
437 static void fd_rwsec_done( int status );
438 static void fd_rwsec_done1(int status);
439 static void fd_writetrack( void );
440 static void fd_writetrack_done( int status );
441 static void fd_times_out(struct timer_list *unused);
442 static void finish_fdc( void );
443 static void finish_fdc_done( int dummy );
444 static void setup_req_params( int drive );
445 static int fd_locked_ioctl(struct block_device *bdev, blk_mode_t mode,
446 unsigned int cmd, unsigned long param);
447 static void fd_probe( int drive );
448 static int fd_test_drive_present( int drive );
449 static void config_types( void );
450 static int floppy_open(struct gendisk *disk, blk_mode_t mode);
451 static void floppy_release(struct gendisk *disk);
452
453 /************************* End of Prototypes **************************/
454
455 static DEFINE_TIMER(motor_off_timer, fd_motor_off_timer);
456 static DEFINE_TIMER(readtrack_timer, fd_readtrack_check);
457 static DEFINE_TIMER(timeout_timer, fd_times_out);
458 static DEFINE_TIMER(fd_timer, check_change);
459
fd_end_request_cur(blk_status_t err)460 static void fd_end_request_cur(blk_status_t err)
461 {
462 DPRINT(("fd_end_request_cur(), bytes %d of %d\n",
463 blk_rq_cur_bytes(fd_request),
464 blk_rq_bytes(fd_request)));
465
466 if (!blk_update_request(fd_request, err,
467 blk_rq_cur_bytes(fd_request))) {
468 DPRINT(("calling __blk_mq_end_request()\n"));
469 __blk_mq_end_request(fd_request, err);
470 fd_request = NULL;
471 } else {
472 /* requeue rest of request */
473 DPRINT(("calling blk_mq_requeue_request()\n"));
474 blk_mq_requeue_request(fd_request, true);
475 fd_request = NULL;
476 }
477 }
478
start_motor_off_timer(void)479 static inline void start_motor_off_timer(void)
480 {
481 mod_timer(&motor_off_timer, jiffies + FD_MOTOR_OFF_DELAY);
482 MotorOffTrys = 0;
483 }
484
start_check_change_timer(void)485 static inline void start_check_change_timer( void )
486 {
487 mod_timer(&fd_timer, jiffies + CHECK_CHANGE_DELAY);
488 }
489
start_timeout(void)490 static inline void start_timeout(void)
491 {
492 mod_timer(&timeout_timer, jiffies + FLOPPY_TIMEOUT);
493 }
494
stop_timeout(void)495 static inline void stop_timeout(void)
496 {
497 del_timer(&timeout_timer);
498 }
499
500 /* Select the side to use. */
501
fd_select_side(int side)502 static void fd_select_side( int side )
503 {
504 unsigned long flags;
505
506 /* protect against various other ints mucking around with the PSG */
507 local_irq_save(flags);
508
509 sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */
510 sound_ym.wd_data = (side == 0) ? sound_ym.rd_data_reg_sel | 0x01 :
511 sound_ym.rd_data_reg_sel & 0xfe;
512
513 local_irq_restore(flags);
514 }
515
516
517 /* Select a drive, update the FDC's track register and set the correct
518 * clock speed for this disk's type.
519 */
520
fd_select_drive(int drive)521 static void fd_select_drive( int drive )
522 {
523 unsigned long flags;
524 unsigned char tmp;
525
526 if (drive == SelectedDrive)
527 return;
528
529 /* protect against various other ints mucking around with the PSG */
530 local_irq_save(flags);
531 sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */
532 tmp = sound_ym.rd_data_reg_sel;
533 sound_ym.wd_data = (tmp | DSKDRVNONE) & ~(drive == 0 ? DSKDRV0 : DSKDRV1);
534 atari_dont_touch_floppy_select = 1;
535 local_irq_restore(flags);
536
537 /* restore track register to saved value */
538 FDC_WRITE( FDCREG_TRACK, UD.track );
539 udelay(25);
540
541 /* select 8/16 MHz */
542 if (UDT)
543 if (ATARIHW_PRESENT(FDCSPEED))
544 dma_wd.fdc_speed = UDT->fdc_speed;
545
546 SelectedDrive = drive;
547 }
548
549
550 /* Deselect both drives. */
551
fd_deselect(void)552 static void fd_deselect( void )
553 {
554 unsigned long flags;
555
556 /* protect against various other ints mucking around with the PSG */
557 local_irq_save(flags);
558 atari_dont_touch_floppy_select = 0;
559 sound_ym.rd_data_reg_sel=14; /* Select PSG Port A */
560 sound_ym.wd_data = (sound_ym.rd_data_reg_sel |
561 (MACH_IS_FALCON ? 3 : 7)); /* no drives selected */
562 /* On Falcon, the drive B select line is used on the printer port, so
563 * leave it alone... */
564 SelectedDrive = -1;
565 local_irq_restore(flags);
566 }
567
568
569 /* This timer function deselects the drives when the FDC switched the
570 * motor off. The deselection cannot happen earlier because the FDC
571 * counts the index signals, which arrive only if one drive is selected.
572 */
573
fd_motor_off_timer(struct timer_list * unused)574 static void fd_motor_off_timer(struct timer_list *unused)
575 {
576 unsigned char status;
577
578 if (SelectedDrive < 0)
579 /* no drive selected, needn't deselect anyone */
580 return;
581
582 if (stdma_islocked())
583 goto retry;
584
585 status = FDC_READ( FDCREG_STATUS );
586
587 if (!(status & 0x80)) {
588 /* motor already turned off by FDC -> deselect drives */
589 MotorOn = 0;
590 fd_deselect();
591 return;
592 }
593 /* not yet off, try again */
594
595 retry:
596 /* Test again later; if tested too often, it seems there is no disk
597 * in the drive and the FDC will leave the motor on forever (or,
598 * at least until a disk is inserted). So we'll test only twice
599 * per second from then on...
600 */
601 mod_timer(&motor_off_timer,
602 jiffies + (MotorOffTrys++ < FD_MOTOR_OFF_MAXTRY ? HZ/20 : HZ/2));
603 }
604
605
606 /* This function is repeatedly called to detect disk changes (as good
607 * as possible) and keep track of the current state of the write protection.
608 */
609
check_change(struct timer_list * unused)610 static void check_change(struct timer_list *unused)
611 {
612 static int drive = 0;
613
614 unsigned long flags;
615 unsigned char old_porta;
616 int stat;
617
618 if (++drive > 1 || !UD.connected)
619 drive = 0;
620
621 /* protect against various other ints mucking around with the PSG */
622 local_irq_save(flags);
623
624 if (!stdma_islocked()) {
625 sound_ym.rd_data_reg_sel = 14;
626 old_porta = sound_ym.rd_data_reg_sel;
627 sound_ym.wd_data = (old_porta | DSKDRVNONE) &
628 ~(drive == 0 ? DSKDRV0 : DSKDRV1);
629 stat = !!(FDC_READ( FDCREG_STATUS ) & FDCSTAT_WPROT);
630 sound_ym.wd_data = old_porta;
631
632 if (stat != UD.wpstat) {
633 DPRINT(( "wpstat[%d] = %d\n", drive, stat ));
634 UD.wpstat = stat;
635 set_bit (drive, &changed_floppies);
636 }
637 }
638 local_irq_restore(flags);
639
640 start_check_change_timer();
641 }
642
643
644 /* Handling of the Head Settling Flag: This flag should be set after each
645 * seek operation, because we don't use seeks with verify.
646 */
647
set_head_settle_flag(void)648 static inline void set_head_settle_flag(void)
649 {
650 HeadSettleFlag = FDCCMDADD_E;
651 }
652
get_head_settle_flag(void)653 static inline int get_head_settle_flag(void)
654 {
655 int tmp = HeadSettleFlag;
656 HeadSettleFlag = 0;
657 return( tmp );
658 }
659
copy_buffer(void * from,void * to)660 static inline void copy_buffer(void *from, void *to)
661 {
662 ulong *p1 = (ulong *)from, *p2 = (ulong *)to;
663 int cnt;
664
665 for (cnt = 512/4; cnt; cnt--)
666 *p2++ = *p1++;
667 }
668
669 /* General Interrupt Handling */
670
671 static void (*FloppyIRQHandler)( int status ) = NULL;
672
floppy_irq(int irq,void * dummy)673 static irqreturn_t floppy_irq (int irq, void *dummy)
674 {
675 unsigned char status;
676 void (*handler)( int );
677
678 handler = xchg(&FloppyIRQHandler, NULL);
679
680 if (handler) {
681 nop();
682 status = FDC_READ( FDCREG_STATUS );
683 DPRINT(("FDC irq, status = %02x handler = %08lx\n",status,(unsigned long)handler));
684 handler( status );
685 }
686 else {
687 DPRINT(("FDC irq, no handler\n"));
688 }
689 return IRQ_HANDLED;
690 }
691
692
693 /* Error handling: If some error happened, retry some times, then
694 * recalibrate, then try again, and fail after MAX_ERRORS.
695 */
696
fd_error(void)697 static void fd_error( void )
698 {
699 if (IsFormatting) {
700 IsFormatting = 0;
701 FormatError = 1;
702 complete(&format_wait);
703 return;
704 }
705
706 if (!fd_request)
707 return;
708
709 unit[SelectedDrive].error_count++;
710 if (unit[SelectedDrive].error_count >= MAX_ERRORS) {
711 printk(KERN_ERR "fd%d: too many errors.\n", SelectedDrive );
712 fd_end_request_cur(BLK_STS_IOERR);
713 finish_fdc();
714 return;
715 }
716 else if (unit[SelectedDrive].error_count == RECALIBRATE_ERRORS) {
717 printk(KERN_WARNING "fd%d: recalibrating\n", SelectedDrive );
718 if (SelectedDrive != -1)
719 SUD.track = -1;
720 }
721 /* need to re-run request to recalibrate */
722 atari_disable_irq( IRQ_MFP_FDC );
723
724 setup_req_params( SelectedDrive );
725 do_fd_action( SelectedDrive );
726
727 atari_enable_irq( IRQ_MFP_FDC );
728 }
729
730
731
732 #define SET_IRQ_HANDLER(proc) do { FloppyIRQHandler = (proc); } while(0)
733
734
735 /* ---------- Formatting ---------- */
736
737 #define FILL(n,val) \
738 do { \
739 memset( p, val, n ); \
740 p += n; \
741 } while(0)
742
do_format(int drive,int type,struct atari_format_descr * desc)743 static int do_format(int drive, int type, struct atari_format_descr *desc)
744 {
745 struct request_queue *q;
746 unsigned char *p;
747 int sect, nsect;
748 unsigned long flags;
749 int ret;
750
751 if (type) {
752 type--;
753 if (type >= NUM_DISK_MINORS ||
754 minor2disktype[type].drive_types > DriveType) {
755 finish_fdc();
756 return -EINVAL;
757 }
758 }
759
760 q = unit[drive].disk[type]->queue;
761 blk_mq_freeze_queue(q);
762 blk_mq_quiesce_queue(q);
763
764 local_irq_save(flags);
765 stdma_lock(floppy_irq, NULL);
766 atari_turnon_irq( IRQ_MFP_FDC ); /* should be already, just to be sure */
767 local_irq_restore(flags);
768
769 if (type) {
770 type = minor2disktype[type].index;
771 UDT = &atari_disk_type[type];
772 }
773
774 if (!UDT || desc->track >= UDT->blocks/UDT->spt/2 || desc->head >= 2) {
775 finish_fdc();
776 ret = -EINVAL;
777 goto out;
778 }
779
780 nsect = UDT->spt;
781 p = TrackBuffer;
782 /* The track buffer is used for the raw track data, so its
783 contents become invalid! */
784 BufferDrive = -1;
785 /* stop deselect timer */
786 del_timer( &motor_off_timer );
787
788 FILL( 60 * (nsect / 9), 0x4e );
789 for( sect = 0; sect < nsect; ++sect ) {
790 FILL( 12, 0 );
791 FILL( 3, 0xf5 );
792 *p++ = 0xfe;
793 *p++ = desc->track;
794 *p++ = desc->head;
795 *p++ = (nsect + sect - desc->sect_offset) % nsect + 1;
796 *p++ = 2;
797 *p++ = 0xf7;
798 FILL( 22, 0x4e );
799 FILL( 12, 0 );
800 FILL( 3, 0xf5 );
801 *p++ = 0xfb;
802 FILL( 512, 0xe5 );
803 *p++ = 0xf7;
804 FILL( 40, 0x4e );
805 }
806 FILL( TrackBuffer+BUFFER_SIZE-p, 0x4e );
807
808 IsFormatting = 1;
809 FormatError = 0;
810 ReqTrack = desc->track;
811 ReqSide = desc->head;
812 do_fd_action( drive );
813
814 wait_for_completion(&format_wait);
815
816 finish_fdc();
817 ret = FormatError ? -EIO : 0;
818 out:
819 blk_mq_unquiesce_queue(q);
820 blk_mq_unfreeze_queue(q);
821 return ret;
822 }
823
824
825 /* do_fd_action() is the general procedure for a fd request: All
826 * required parameter settings (drive select, side select, track
827 * position) are checked and set if needed. For each of these
828 * parameters and the actual reading or writing exist two functions:
829 * one that starts the setting (or skips it if possible) and one
830 * callback for the "done" interrupt. Each done func calls the next
831 * set function to propagate the request down to fd_rwsec_done().
832 */
833
do_fd_action(int drive)834 static void do_fd_action( int drive )
835 {
836 DPRINT(("do_fd_action\n"));
837
838 if (UseTrackbuffer && !IsFormatting) {
839 repeat:
840 if (IS_BUFFERED( drive, ReqSide, ReqTrack )) {
841 if (ReqCmd == READ) {
842 copy_buffer( SECTOR_BUFFER(ReqSector), ReqData );
843 if (++ReqCnt < blk_rq_cur_sectors(fd_request)) {
844 /* read next sector */
845 setup_req_params( drive );
846 goto repeat;
847 }
848 else {
849 /* all sectors finished */
850 fd_end_request_cur(BLK_STS_OK);
851 finish_fdc();
852 return;
853 }
854 }
855 else {
856 /* cmd == WRITE, pay attention to track buffer
857 * consistency! */
858 copy_buffer( ReqData, SECTOR_BUFFER(ReqSector) );
859 }
860 }
861 }
862
863 if (SelectedDrive != drive)
864 fd_select_drive( drive );
865
866 if (UD.track == -1)
867 fd_calibrate();
868 else if (UD.track != ReqTrack << UDT->stretch)
869 fd_seek();
870 else if (IsFormatting)
871 fd_writetrack();
872 else
873 fd_rwsec();
874 }
875
876
877 /* Seek to track 0 if the current track is unknown */
878
fd_calibrate(void)879 static void fd_calibrate( void )
880 {
881 if (SUD.track >= 0) {
882 fd_calibrate_done( 0 );
883 return;
884 }
885
886 if (ATARIHW_PRESENT(FDCSPEED))
887 dma_wd.fdc_speed = 0; /* always seek with 8 Mhz */
888 DPRINT(("fd_calibrate\n"));
889 SET_IRQ_HANDLER( fd_calibrate_done );
890 /* we can't verify, since the speed may be incorrect */
891 FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | SUD.steprate );
892
893 NeedSeek = 1;
894 MotorOn = 1;
895 start_timeout();
896 /* wait for IRQ */
897 }
898
899
fd_calibrate_done(int status)900 static void fd_calibrate_done( int status )
901 {
902 DPRINT(("fd_calibrate_done()\n"));
903 stop_timeout();
904
905 /* set the correct speed now */
906 if (ATARIHW_PRESENT(FDCSPEED))
907 dma_wd.fdc_speed = SUDT->fdc_speed;
908 if (status & FDCSTAT_RECNF) {
909 printk(KERN_ERR "fd%d: restore failed\n", SelectedDrive );
910 fd_error();
911 }
912 else {
913 SUD.track = 0;
914 fd_seek();
915 }
916 }
917
918
919 /* Seek the drive to the requested track. The drive must have been
920 * calibrated at some point before this.
921 */
922
fd_seek(void)923 static void fd_seek( void )
924 {
925 if (SUD.track == ReqTrack << SUDT->stretch) {
926 fd_seek_done( 0 );
927 return;
928 }
929
930 if (ATARIHW_PRESENT(FDCSPEED)) {
931 dma_wd.fdc_speed = 0; /* always seek witch 8 Mhz */
932 MFPDELAY();
933 }
934
935 DPRINT(("fd_seek() to track %d\n",ReqTrack));
936 FDC_WRITE( FDCREG_DATA, ReqTrack << SUDT->stretch);
937 udelay(25);
938 SET_IRQ_HANDLER( fd_seek_done );
939 FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK | SUD.steprate );
940
941 MotorOn = 1;
942 set_head_settle_flag();
943 start_timeout();
944 /* wait for IRQ */
945 }
946
947
fd_seek_done(int status)948 static void fd_seek_done( int status )
949 {
950 DPRINT(("fd_seek_done()\n"));
951 stop_timeout();
952
953 /* set the correct speed */
954 if (ATARIHW_PRESENT(FDCSPEED))
955 dma_wd.fdc_speed = SUDT->fdc_speed;
956 if (status & FDCSTAT_RECNF) {
957 printk(KERN_ERR "fd%d: seek error (to track %d)\n",
958 SelectedDrive, ReqTrack );
959 /* we don't know exactly which track we are on now! */
960 SUD.track = -1;
961 fd_error();
962 }
963 else {
964 SUD.track = ReqTrack << SUDT->stretch;
965 NeedSeek = 0;
966 if (IsFormatting)
967 fd_writetrack();
968 else
969 fd_rwsec();
970 }
971 }
972
973
974 /* This does the actual reading/writing after positioning the head
975 * over the correct track.
976 */
977
978 static int MultReadInProgress = 0;
979
980
fd_rwsec(void)981 static void fd_rwsec( void )
982 {
983 unsigned long paddr, flags;
984 unsigned int rwflag, old_motoron;
985 unsigned int track;
986
987 DPRINT(("fd_rwsec(), Sec=%d, Access=%c\n",ReqSector, ReqCmd == WRITE ? 'w' : 'r' ));
988 if (ReqCmd == WRITE) {
989 if (ATARIHW_PRESENT(EXTD_DMA)) {
990 paddr = virt_to_phys(ReqData);
991 }
992 else {
993 copy_buffer( ReqData, DMABuffer );
994 paddr = PhysDMABuffer;
995 }
996 dma_cache_maintenance( paddr, 512, 1 );
997 rwflag = 0x100;
998 }
999 else {
1000 if (read_track)
1001 paddr = PhysTrackBuffer;
1002 else
1003 paddr = ATARIHW_PRESENT(EXTD_DMA) ?
1004 virt_to_phys(ReqData) : PhysDMABuffer;
1005 rwflag = 0;
1006 }
1007
1008 fd_select_side( ReqSide );
1009
1010 /* Start sector of this operation */
1011 FDC_WRITE( FDCREG_SECTOR, read_track ? 1 : ReqSector );
1012 MFPDELAY();
1013 /* Cheat for track if stretch != 0 */
1014 if (SUDT->stretch) {
1015 track = FDC_READ( FDCREG_TRACK);
1016 MFPDELAY();
1017 FDC_WRITE( FDCREG_TRACK, track >> SUDT->stretch);
1018 }
1019 udelay(25);
1020
1021 /* Setup DMA */
1022 local_irq_save(flags);
1023 dma_wd.dma_lo = (unsigned char)paddr;
1024 MFPDELAY();
1025 paddr >>= 8;
1026 dma_wd.dma_md = (unsigned char)paddr;
1027 MFPDELAY();
1028 paddr >>= 8;
1029 if (ATARIHW_PRESENT(EXTD_DMA))
1030 st_dma_ext_dmahi = (unsigned short)paddr;
1031 else
1032 dma_wd.dma_hi = (unsigned char)paddr;
1033 MFPDELAY();
1034 local_irq_restore(flags);
1035
1036 /* Clear FIFO and switch DMA to correct mode */
1037 dma_wd.dma_mode_status = 0x90 | rwflag;
1038 MFPDELAY();
1039 dma_wd.dma_mode_status = 0x90 | (rwflag ^ 0x100);
1040 MFPDELAY();
1041 dma_wd.dma_mode_status = 0x90 | rwflag;
1042 MFPDELAY();
1043
1044 /* How many sectors for DMA */
1045 dma_wd.fdc_acces_seccount = read_track ? SUDT->spt : 1;
1046
1047 udelay(25);
1048
1049 /* Start operation */
1050 dma_wd.dma_mode_status = FDCSELREG_STP | rwflag;
1051 udelay(25);
1052 SET_IRQ_HANDLER( fd_rwsec_done );
1053 dma_wd.fdc_acces_seccount =
1054 (get_head_settle_flag() |
1055 (rwflag ? FDCCMD_WRSEC : (FDCCMD_RDSEC | (read_track ? FDCCMDADD_M : 0))));
1056
1057 old_motoron = MotorOn;
1058 MotorOn = 1;
1059 NeedSeek = 1;
1060 /* wait for interrupt */
1061
1062 if (read_track) {
1063 /* If reading a whole track, wait about one disk rotation and
1064 * then check if all sectors are read. The FDC will even
1065 * search for the first non-existent sector and need 1 sec to
1066 * recognise that it isn't present :-(
1067 */
1068 MultReadInProgress = 1;
1069 mod_timer(&readtrack_timer,
1070 /* 1 rot. + 5 rot.s if motor was off */
1071 jiffies + HZ/5 + (old_motoron ? 0 : HZ));
1072 }
1073 start_timeout();
1074 }
1075
1076
fd_readtrack_check(struct timer_list * unused)1077 static void fd_readtrack_check(struct timer_list *unused)
1078 {
1079 unsigned long flags, addr, addr2;
1080
1081 local_irq_save(flags);
1082
1083 if (!MultReadInProgress) {
1084 /* This prevents a race condition that could arise if the
1085 * interrupt is triggered while the calling of this timer
1086 * callback function takes place. The IRQ function then has
1087 * already cleared 'MultReadInProgress' when flow of control
1088 * gets here.
1089 */
1090 local_irq_restore(flags);
1091 return;
1092 }
1093
1094 /* get the current DMA address */
1095 /* ++ f.a. read twice to avoid being fooled by switcher */
1096 addr = 0;
1097 do {
1098 addr2 = addr;
1099 addr = dma_wd.dma_lo & 0xff;
1100 MFPDELAY();
1101 addr |= (dma_wd.dma_md & 0xff) << 8;
1102 MFPDELAY();
1103 if (ATARIHW_PRESENT( EXTD_DMA ))
1104 addr |= (st_dma_ext_dmahi & 0xffff) << 16;
1105 else
1106 addr |= (dma_wd.dma_hi & 0xff) << 16;
1107 MFPDELAY();
1108 } while(addr != addr2);
1109
1110 if (addr >= PhysTrackBuffer + SUDT->spt*512) {
1111 /* already read enough data, force an FDC interrupt to stop
1112 * the read operation
1113 */
1114 SET_IRQ_HANDLER( NULL );
1115 MultReadInProgress = 0;
1116 local_irq_restore(flags);
1117 DPRINT(("fd_readtrack_check(): done\n"));
1118 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1119 udelay(25);
1120
1121 /* No error until now -- the FDC would have interrupted
1122 * otherwise!
1123 */
1124 fd_rwsec_done1(0);
1125 }
1126 else {
1127 /* not yet finished, wait another tenth rotation */
1128 local_irq_restore(flags);
1129 DPRINT(("fd_readtrack_check(): not yet finished\n"));
1130 mod_timer(&readtrack_timer, jiffies + HZ/5/10);
1131 }
1132 }
1133
1134
fd_rwsec_done(int status)1135 static void fd_rwsec_done( int status )
1136 {
1137 DPRINT(("fd_rwsec_done()\n"));
1138
1139 if (read_track) {
1140 del_timer(&readtrack_timer);
1141 if (!MultReadInProgress)
1142 return;
1143 MultReadInProgress = 0;
1144 }
1145 fd_rwsec_done1(status);
1146 }
1147
fd_rwsec_done1(int status)1148 static void fd_rwsec_done1(int status)
1149 {
1150 unsigned int track;
1151
1152 stop_timeout();
1153
1154 /* Correct the track if stretch != 0 */
1155 if (SUDT->stretch) {
1156 track = FDC_READ( FDCREG_TRACK);
1157 MFPDELAY();
1158 FDC_WRITE( FDCREG_TRACK, track << SUDT->stretch);
1159 }
1160
1161 if (!UseTrackbuffer) {
1162 dma_wd.dma_mode_status = 0x90;
1163 MFPDELAY();
1164 if (!(dma_wd.dma_mode_status & 0x01)) {
1165 printk(KERN_ERR "fd%d: DMA error\n", SelectedDrive );
1166 goto err_end;
1167 }
1168 }
1169 MFPDELAY();
1170
1171 if (ReqCmd == WRITE && (status & FDCSTAT_WPROT)) {
1172 printk(KERN_NOTICE "fd%d: is write protected\n", SelectedDrive );
1173 goto err_end;
1174 }
1175 if ((status & FDCSTAT_RECNF) &&
1176 /* RECNF is no error after a multiple read when the FDC
1177 searched for a non-existent sector! */
1178 !(read_track && FDC_READ(FDCREG_SECTOR) > SUDT->spt)) {
1179 if (Probing) {
1180 if (SUDT > atari_disk_type) {
1181 if (SUDT[-1].blocks > ReqBlock) {
1182 /* try another disk type */
1183 SUDT--;
1184 set_capacity(unit[SelectedDrive].disk[0],
1185 SUDT->blocks);
1186 } else
1187 Probing = 0;
1188 }
1189 else {
1190 if (SUD.flags & FTD_MSG)
1191 printk(KERN_INFO "fd%d: Auto-detected floppy type %s\n",
1192 SelectedDrive, SUDT->name );
1193 Probing=0;
1194 }
1195 } else {
1196 /* record not found, but not probing. Maybe stretch wrong ? Restart probing */
1197 if (SUD.autoprobe) {
1198 SUDT = atari_disk_type + StartDiskType[DriveType];
1199 set_capacity(unit[SelectedDrive].disk[0],
1200 SUDT->blocks);
1201 Probing = 1;
1202 }
1203 }
1204 if (Probing) {
1205 if (ATARIHW_PRESENT(FDCSPEED)) {
1206 dma_wd.fdc_speed = SUDT->fdc_speed;
1207 MFPDELAY();
1208 }
1209 setup_req_params( SelectedDrive );
1210 BufferDrive = -1;
1211 do_fd_action( SelectedDrive );
1212 return;
1213 }
1214
1215 printk(KERN_ERR "fd%d: sector %d not found (side %d, track %d)\n",
1216 SelectedDrive, FDC_READ (FDCREG_SECTOR), ReqSide, ReqTrack );
1217 goto err_end;
1218 }
1219 if (status & FDCSTAT_CRC) {
1220 printk(KERN_ERR "fd%d: CRC error (side %d, track %d, sector %d)\n",
1221 SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) );
1222 goto err_end;
1223 }
1224 if (status & FDCSTAT_LOST) {
1225 printk(KERN_ERR "fd%d: lost data (side %d, track %d, sector %d)\n",
1226 SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) );
1227 goto err_end;
1228 }
1229
1230 Probing = 0;
1231
1232 if (ReqCmd == READ) {
1233 if (!read_track) {
1234 void *addr;
1235 addr = ATARIHW_PRESENT( EXTD_DMA ) ? ReqData : DMABuffer;
1236 dma_cache_maintenance( virt_to_phys(addr), 512, 0 );
1237 if (!ATARIHW_PRESENT( EXTD_DMA ))
1238 copy_buffer (addr, ReqData);
1239 } else {
1240 dma_cache_maintenance( PhysTrackBuffer, MaxSectors[DriveType] * 512, 0 );
1241 BufferDrive = SelectedDrive;
1242 BufferSide = ReqSide;
1243 BufferTrack = ReqTrack;
1244 copy_buffer (SECTOR_BUFFER (ReqSector), ReqData);
1245 }
1246 }
1247
1248 if (++ReqCnt < blk_rq_cur_sectors(fd_request)) {
1249 /* read next sector */
1250 setup_req_params( SelectedDrive );
1251 do_fd_action( SelectedDrive );
1252 }
1253 else {
1254 /* all sectors finished */
1255 fd_end_request_cur(BLK_STS_OK);
1256 finish_fdc();
1257 }
1258 return;
1259
1260 err_end:
1261 BufferDrive = -1;
1262 fd_error();
1263 }
1264
1265
fd_writetrack(void)1266 static void fd_writetrack( void )
1267 {
1268 unsigned long paddr, flags;
1269 unsigned int track;
1270
1271 DPRINT(("fd_writetrack() Tr=%d Si=%d\n", ReqTrack, ReqSide ));
1272
1273 paddr = PhysTrackBuffer;
1274 dma_cache_maintenance( paddr, BUFFER_SIZE, 1 );
1275
1276 fd_select_side( ReqSide );
1277
1278 /* Cheat for track if stretch != 0 */
1279 if (SUDT->stretch) {
1280 track = FDC_READ( FDCREG_TRACK);
1281 MFPDELAY();
1282 FDC_WRITE(FDCREG_TRACK,track >> SUDT->stretch);
1283 }
1284 udelay(40);
1285
1286 /* Setup DMA */
1287 local_irq_save(flags);
1288 dma_wd.dma_lo = (unsigned char)paddr;
1289 MFPDELAY();
1290 paddr >>= 8;
1291 dma_wd.dma_md = (unsigned char)paddr;
1292 MFPDELAY();
1293 paddr >>= 8;
1294 if (ATARIHW_PRESENT( EXTD_DMA ))
1295 st_dma_ext_dmahi = (unsigned short)paddr;
1296 else
1297 dma_wd.dma_hi = (unsigned char)paddr;
1298 MFPDELAY();
1299 local_irq_restore(flags);
1300
1301 /* Clear FIFO and switch DMA to correct mode */
1302 dma_wd.dma_mode_status = 0x190;
1303 MFPDELAY();
1304 dma_wd.dma_mode_status = 0x90;
1305 MFPDELAY();
1306 dma_wd.dma_mode_status = 0x190;
1307 MFPDELAY();
1308
1309 /* How many sectors for DMA */
1310 dma_wd.fdc_acces_seccount = BUFFER_SIZE/512;
1311 udelay(40);
1312
1313 /* Start operation */
1314 dma_wd.dma_mode_status = FDCSELREG_STP | 0x100;
1315 udelay(40);
1316 SET_IRQ_HANDLER( fd_writetrack_done );
1317 dma_wd.fdc_acces_seccount = FDCCMD_WRTRA | get_head_settle_flag();
1318
1319 MotorOn = 1;
1320 start_timeout();
1321 /* wait for interrupt */
1322 }
1323
1324
fd_writetrack_done(int status)1325 static void fd_writetrack_done( int status )
1326 {
1327 DPRINT(("fd_writetrack_done()\n"));
1328
1329 stop_timeout();
1330
1331 if (status & FDCSTAT_WPROT) {
1332 printk(KERN_NOTICE "fd%d: is write protected\n", SelectedDrive );
1333 goto err_end;
1334 }
1335 if (status & FDCSTAT_LOST) {
1336 printk(KERN_ERR "fd%d: lost data (side %d, track %d)\n",
1337 SelectedDrive, ReqSide, ReqTrack );
1338 goto err_end;
1339 }
1340
1341 complete(&format_wait);
1342 return;
1343
1344 err_end:
1345 fd_error();
1346 }
1347
fd_times_out(struct timer_list * unused)1348 static void fd_times_out(struct timer_list *unused)
1349 {
1350 atari_disable_irq( IRQ_MFP_FDC );
1351 if (!FloppyIRQHandler) goto end; /* int occurred after timer was fired, but
1352 * before we came here... */
1353
1354 SET_IRQ_HANDLER( NULL );
1355 /* If the timeout occurred while the readtrack_check timer was
1356 * active, we need to cancel it, else bad things will happen */
1357 if (UseTrackbuffer)
1358 del_timer( &readtrack_timer );
1359 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1360 udelay( 25 );
1361
1362 printk(KERN_ERR "floppy timeout\n" );
1363 fd_error();
1364 end:
1365 atari_enable_irq( IRQ_MFP_FDC );
1366 }
1367
1368
1369 /* The (noop) seek operation here is needed to make the WP bit in the
1370 * FDC status register accessible for check_change. If the last disk
1371 * operation would have been a RDSEC, this bit would always read as 0
1372 * no matter what :-( To save time, the seek goes to the track we're
1373 * already on.
1374 */
1375
finish_fdc(void)1376 static void finish_fdc( void )
1377 {
1378 if (!NeedSeek || !stdma_is_locked_by(floppy_irq)) {
1379 finish_fdc_done( 0 );
1380 }
1381 else {
1382 DPRINT(("finish_fdc: dummy seek started\n"));
1383 FDC_WRITE (FDCREG_DATA, SUD.track);
1384 SET_IRQ_HANDLER( finish_fdc_done );
1385 FDC_WRITE (FDCREG_CMD, FDCCMD_SEEK);
1386 MotorOn = 1;
1387 start_timeout();
1388 /* we must wait for the IRQ here, because the ST-DMA
1389 is released immediately afterwards and the interrupt
1390 may be delivered to the wrong driver. */
1391 }
1392 }
1393
1394
finish_fdc_done(int dummy)1395 static void finish_fdc_done( int dummy )
1396 {
1397 unsigned long flags;
1398
1399 DPRINT(("finish_fdc_done entered\n"));
1400 stop_timeout();
1401 NeedSeek = 0;
1402
1403 if (timer_pending(&fd_timer) && time_before(fd_timer.expires, jiffies + 5))
1404 /* If the check for a disk change is done too early after this
1405 * last seek command, the WP bit still reads wrong :-((
1406 */
1407 mod_timer(&fd_timer, jiffies + 5);
1408 else
1409 start_check_change_timer();
1410 start_motor_off_timer();
1411
1412 local_irq_save(flags);
1413 if (stdma_is_locked_by(floppy_irq))
1414 stdma_release();
1415 local_irq_restore(flags);
1416
1417 DPRINT(("finish_fdc() finished\n"));
1418 }
1419
1420 /* The detection of disk changes is a dark chapter in Atari history :-(
1421 * Because the "Drive ready" signal isn't present in the Atari
1422 * hardware, one has to rely on the "Write Protect". This works fine,
1423 * as long as no write protected disks are used. TOS solves this
1424 * problem by introducing tri-state logic ("maybe changed") and
1425 * looking at the serial number in block 0. This isn't possible for
1426 * Linux, since the floppy driver can't make assumptions about the
1427 * filesystem used on the disk and thus the contents of block 0. I've
1428 * chosen the method to always say "The disk was changed" if it is
1429 * unsure whether it was. This implies that every open or mount
1430 * invalidates the disk buffers if you work with write protected
1431 * disks. But at least this is better than working with incorrect data
1432 * due to unrecognised disk changes.
1433 */
1434
floppy_check_events(struct gendisk * disk,unsigned int clearing)1435 static unsigned int floppy_check_events(struct gendisk *disk,
1436 unsigned int clearing)
1437 {
1438 struct atari_floppy_struct *p = disk->private_data;
1439 unsigned int drive = p - unit;
1440 if (test_bit (drive, &fake_change)) {
1441 /* simulated change (e.g. after formatting) */
1442 return DISK_EVENT_MEDIA_CHANGE;
1443 }
1444 if (test_bit (drive, &changed_floppies)) {
1445 /* surely changed (the WP signal changed at least once) */
1446 return DISK_EVENT_MEDIA_CHANGE;
1447 }
1448 if (UD.wpstat) {
1449 /* WP is on -> could be changed: to be sure, buffers should be
1450 * invalidated...
1451 */
1452 return DISK_EVENT_MEDIA_CHANGE;
1453 }
1454
1455 return 0;
1456 }
1457
floppy_revalidate(struct gendisk * disk)1458 static int floppy_revalidate(struct gendisk *disk)
1459 {
1460 struct atari_floppy_struct *p = disk->private_data;
1461 unsigned int drive = p - unit;
1462
1463 if (test_bit(drive, &changed_floppies) ||
1464 test_bit(drive, &fake_change) || !p->disktype) {
1465 if (UD.flags & FTD_MSG)
1466 printk(KERN_ERR "floppy: clear format %p!\n", UDT);
1467 BufferDrive = -1;
1468 clear_bit(drive, &fake_change);
1469 clear_bit(drive, &changed_floppies);
1470 /* MSch: clearing geometry makes sense only for autoprobe
1471 formats, for 'permanent user-defined' parameter:
1472 restore default_params[] here if flagged valid! */
1473 if (default_params[drive].blocks == 0)
1474 UDT = NULL;
1475 else
1476 UDT = &default_params[drive];
1477 }
1478 return 0;
1479 }
1480
1481
1482 /* This sets up the global variables describing the current request. */
1483
setup_req_params(int drive)1484 static void setup_req_params( int drive )
1485 {
1486 int block = ReqBlock + ReqCnt;
1487
1488 ReqTrack = block / UDT->spt;
1489 ReqSector = block - ReqTrack * UDT->spt + 1;
1490 ReqSide = ReqTrack & 1;
1491 ReqTrack >>= 1;
1492 ReqData = ReqBuffer + 512 * ReqCnt;
1493
1494 if (UseTrackbuffer)
1495 read_track = (ReqCmd == READ && unit[drive].error_count == 0);
1496 else
1497 read_track = 0;
1498
1499 DPRINT(("Request params: Si=%d Tr=%d Se=%d Data=%08lx\n",ReqSide,
1500 ReqTrack, ReqSector, (unsigned long)ReqData ));
1501 }
1502
ataflop_queue_rq(struct blk_mq_hw_ctx * hctx,const struct blk_mq_queue_data * bd)1503 static blk_status_t ataflop_queue_rq(struct blk_mq_hw_ctx *hctx,
1504 const struct blk_mq_queue_data *bd)
1505 {
1506 struct atari_floppy_struct *floppy = bd->rq->q->disk->private_data;
1507 int drive = floppy - unit;
1508 int type = floppy->type;
1509
1510 DPRINT(("Queue request: drive %d type %d sectors %d of %d last %d\n",
1511 drive, type, blk_rq_cur_sectors(bd->rq),
1512 blk_rq_sectors(bd->rq), bd->last));
1513
1514 spin_lock_irq(&ataflop_lock);
1515 if (fd_request) {
1516 spin_unlock_irq(&ataflop_lock);
1517 return BLK_STS_DEV_RESOURCE;
1518 }
1519 if (!stdma_try_lock(floppy_irq, NULL)) {
1520 spin_unlock_irq(&ataflop_lock);
1521 return BLK_STS_RESOURCE;
1522 }
1523 fd_request = bd->rq;
1524 unit[drive].error_count = 0;
1525 blk_mq_start_request(fd_request);
1526
1527 atari_disable_irq( IRQ_MFP_FDC );
1528
1529 IsFormatting = 0;
1530
1531 if (!UD.connected) {
1532 /* drive not connected */
1533 printk(KERN_ERR "Unknown Device: fd%d\n", drive );
1534 fd_end_request_cur(BLK_STS_IOERR);
1535 stdma_release();
1536 goto out;
1537 }
1538
1539 if (type == 0) {
1540 if (!UDT) {
1541 Probing = 1;
1542 UDT = atari_disk_type + StartDiskType[DriveType];
1543 set_capacity(bd->rq->q->disk, UDT->blocks);
1544 UD.autoprobe = 1;
1545 }
1546 }
1547 else {
1548 /* user supplied disk type */
1549 if (--type >= NUM_DISK_MINORS) {
1550 printk(KERN_WARNING "fd%d: invalid disk format", drive );
1551 fd_end_request_cur(BLK_STS_IOERR);
1552 stdma_release();
1553 goto out;
1554 }
1555 if (minor2disktype[type].drive_types > DriveType) {
1556 printk(KERN_WARNING "fd%d: unsupported disk format", drive );
1557 fd_end_request_cur(BLK_STS_IOERR);
1558 stdma_release();
1559 goto out;
1560 }
1561 type = minor2disktype[type].index;
1562 UDT = &atari_disk_type[type];
1563 set_capacity(bd->rq->q->disk, UDT->blocks);
1564 UD.autoprobe = 0;
1565 }
1566
1567 /* stop deselect timer */
1568 del_timer( &motor_off_timer );
1569
1570 ReqCnt = 0;
1571 ReqCmd = rq_data_dir(fd_request);
1572 ReqBlock = blk_rq_pos(fd_request);
1573 ReqBuffer = bio_data(fd_request->bio);
1574 setup_req_params( drive );
1575 do_fd_action( drive );
1576
1577 atari_enable_irq( IRQ_MFP_FDC );
1578
1579 out:
1580 spin_unlock_irq(&ataflop_lock);
1581 return BLK_STS_OK;
1582 }
1583
fd_locked_ioctl(struct block_device * bdev,blk_mode_t mode,unsigned int cmd,unsigned long param)1584 static int fd_locked_ioctl(struct block_device *bdev, blk_mode_t mode,
1585 unsigned int cmd, unsigned long param)
1586 {
1587 struct gendisk *disk = bdev->bd_disk;
1588 struct atari_floppy_struct *floppy = disk->private_data;
1589 int drive = floppy - unit;
1590 int type = floppy->type;
1591 struct atari_format_descr fmt_desc;
1592 struct atari_disk_type *dtp;
1593 struct floppy_struct getprm;
1594 int settype;
1595 struct floppy_struct setprm;
1596 void __user *argp = (void __user *)param;
1597
1598 switch (cmd) {
1599 case FDGETPRM:
1600 if (type) {
1601 if (--type >= NUM_DISK_MINORS)
1602 return -ENODEV;
1603 if (minor2disktype[type].drive_types > DriveType)
1604 return -ENODEV;
1605 type = minor2disktype[type].index;
1606 dtp = &atari_disk_type[type];
1607 if (UD.flags & FTD_MSG)
1608 printk (KERN_ERR "floppy%d: found dtp %p name %s!\n",
1609 drive, dtp, dtp->name);
1610 }
1611 else {
1612 if (!UDT)
1613 return -ENXIO;
1614 else
1615 dtp = UDT;
1616 }
1617 memset((void *)&getprm, 0, sizeof(getprm));
1618 getprm.size = dtp->blocks;
1619 getprm.sect = dtp->spt;
1620 getprm.head = 2;
1621 getprm.track = dtp->blocks/dtp->spt/2;
1622 getprm.stretch = dtp->stretch;
1623 if (copy_to_user(argp, &getprm, sizeof(getprm)))
1624 return -EFAULT;
1625 return 0;
1626 }
1627 switch (cmd) {
1628 case FDSETPRM:
1629 case FDDEFPRM:
1630 /*
1631 * MSch 7/96: simple 'set geometry' case: just set the
1632 * 'default' device params (minor == 0).
1633 * Currently, the drive geometry is cleared after each
1634 * disk change and subsequent revalidate()! simple
1635 * implementation of FDDEFPRM: save geometry from a
1636 * FDDEFPRM call and restore it in floppy_revalidate() !
1637 */
1638
1639 /* get the parameters from user space */
1640 if (floppy->ref != 1 && floppy->ref != -1)
1641 return -EBUSY;
1642 if (copy_from_user(&setprm, argp, sizeof(setprm)))
1643 return -EFAULT;
1644 /*
1645 * first of all: check for floppy change and revalidate,
1646 * or the next access will revalidate - and clear UDT :-(
1647 */
1648
1649 if (floppy_check_events(disk, 0))
1650 floppy_revalidate(disk);
1651
1652 if (UD.flags & FTD_MSG)
1653 printk (KERN_INFO "floppy%d: setting size %d spt %d str %d!\n",
1654 drive, setprm.size, setprm.sect, setprm.stretch);
1655
1656 /* what if type > 0 here? Overwrite specified entry ? */
1657 if (type) {
1658 /* refuse to re-set a predefined type for now */
1659 finish_fdc();
1660 return -EINVAL;
1661 }
1662
1663 /*
1664 * type == 0: first look for a matching entry in the type list,
1665 * and set the UD.disktype field to use the perdefined entry.
1666 * TODO: add user-defined format to head of autoprobe list ?
1667 * Useful to include the user-type for future autodetection!
1668 */
1669
1670 for (settype = 0; settype < NUM_DISK_MINORS; settype++) {
1671 int setidx = 0;
1672 if (minor2disktype[settype].drive_types > DriveType) {
1673 /* skip this one, invalid for drive ... */
1674 continue;
1675 }
1676 setidx = minor2disktype[settype].index;
1677 dtp = &atari_disk_type[setidx];
1678
1679 /* found matching entry ?? */
1680 if ( dtp->blocks == setprm.size
1681 && dtp->spt == setprm.sect
1682 && dtp->stretch == setprm.stretch ) {
1683 if (UD.flags & FTD_MSG)
1684 printk (KERN_INFO "floppy%d: setting %s %p!\n",
1685 drive, dtp->name, dtp);
1686 UDT = dtp;
1687 set_capacity(disk, UDT->blocks);
1688
1689 if (cmd == FDDEFPRM) {
1690 /* save settings as permanent default type */
1691 default_params[drive].name = dtp->name;
1692 default_params[drive].spt = dtp->spt;
1693 default_params[drive].blocks = dtp->blocks;
1694 default_params[drive].fdc_speed = dtp->fdc_speed;
1695 default_params[drive].stretch = dtp->stretch;
1696 }
1697
1698 return 0;
1699 }
1700
1701 }
1702
1703 /* no matching disk type found above - setting user_params */
1704
1705 if (cmd == FDDEFPRM) {
1706 /* set permanent type */
1707 dtp = &default_params[drive];
1708 } else
1709 /* set user type (reset by disk change!) */
1710 dtp = &user_params[drive];
1711
1712 dtp->name = "user format";
1713 dtp->blocks = setprm.size;
1714 dtp->spt = setprm.sect;
1715 if (setprm.sect > 14)
1716 dtp->fdc_speed = 3;
1717 else
1718 dtp->fdc_speed = 0;
1719 dtp->stretch = setprm.stretch;
1720
1721 if (UD.flags & FTD_MSG)
1722 printk (KERN_INFO "floppy%d: blk %d spt %d str %d!\n",
1723 drive, dtp->blocks, dtp->spt, dtp->stretch);
1724
1725 /* sanity check */
1726 if (setprm.track != dtp->blocks/dtp->spt/2 ||
1727 setprm.head != 2) {
1728 finish_fdc();
1729 return -EINVAL;
1730 }
1731
1732 UDT = dtp;
1733 set_capacity(disk, UDT->blocks);
1734
1735 return 0;
1736 case FDMSGON:
1737 UD.flags |= FTD_MSG;
1738 return 0;
1739 case FDMSGOFF:
1740 UD.flags &= ~FTD_MSG;
1741 return 0;
1742 case FDSETEMSGTRESH:
1743 return -EINVAL;
1744 case FDFMTBEG:
1745 return 0;
1746 case FDFMTTRK:
1747 if (floppy->ref != 1 && floppy->ref != -1)
1748 return -EBUSY;
1749 if (copy_from_user(&fmt_desc, argp, sizeof(fmt_desc)))
1750 return -EFAULT;
1751 return do_format(drive, type, &fmt_desc);
1752 case FDCLRPRM:
1753 UDT = NULL;
1754 /* MSch: invalidate default_params */
1755 default_params[drive].blocks = 0;
1756 set_capacity(disk, MAX_DISK_SIZE * 2);
1757 fallthrough;
1758 case FDFMTEND:
1759 case FDFLUSH:
1760 /* invalidate the buffer track to force a reread */
1761 BufferDrive = -1;
1762 set_bit(drive, &fake_change);
1763 if (disk_check_media_change(disk))
1764 floppy_revalidate(disk);
1765 return 0;
1766 default:
1767 return -EINVAL;
1768 }
1769 }
1770
fd_ioctl(struct block_device * bdev,blk_mode_t mode,unsigned int cmd,unsigned long arg)1771 static int fd_ioctl(struct block_device *bdev, blk_mode_t mode,
1772 unsigned int cmd, unsigned long arg)
1773 {
1774 int ret;
1775
1776 mutex_lock(&ataflop_mutex);
1777 ret = fd_locked_ioctl(bdev, mode, cmd, arg);
1778 mutex_unlock(&ataflop_mutex);
1779
1780 return ret;
1781 }
1782
1783 /* Initialize the 'unit' variable for drive 'drive' */
1784
fd_probe(int drive)1785 static void __init fd_probe( int drive )
1786 {
1787 UD.connected = 0;
1788 UDT = NULL;
1789
1790 if (!fd_test_drive_present( drive ))
1791 return;
1792
1793 UD.connected = 1;
1794 UD.track = 0;
1795 switch( UserSteprate[drive] ) {
1796 case 2:
1797 UD.steprate = FDCSTEP_2;
1798 break;
1799 case 3:
1800 UD.steprate = FDCSTEP_3;
1801 break;
1802 case 6:
1803 UD.steprate = FDCSTEP_6;
1804 break;
1805 case 12:
1806 UD.steprate = FDCSTEP_12;
1807 break;
1808 default: /* should be -1 for "not set by user" */
1809 if (ATARIHW_PRESENT( FDCSPEED ) || MACH_IS_MEDUSA)
1810 UD.steprate = FDCSTEP_3;
1811 else
1812 UD.steprate = FDCSTEP_6;
1813 break;
1814 }
1815 MotorOn = 1; /* from probe restore operation! */
1816 }
1817
1818
1819 /* This function tests the physical presence of a floppy drive (not
1820 * whether a disk is inserted). This is done by issuing a restore
1821 * command, waiting max. 2 seconds (that should be enough to move the
1822 * head across the whole disk) and looking at the state of the "TR00"
1823 * signal. This should now be raised if there is a drive connected
1824 * (and there is no hardware failure :-) Otherwise, the drive is
1825 * declared absent.
1826 */
1827
fd_test_drive_present(int drive)1828 static int __init fd_test_drive_present( int drive )
1829 {
1830 unsigned long timeout;
1831 unsigned char status;
1832 int ok;
1833
1834 if (drive >= (MACH_IS_FALCON ? 1 : 2)) return( 0 );
1835 fd_select_drive( drive );
1836
1837 /* disable interrupt temporarily */
1838 atari_turnoff_irq( IRQ_MFP_FDC );
1839 FDC_WRITE (FDCREG_TRACK, 0xff00);
1840 FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | FDCCMDADD_H | FDCSTEP_6 );
1841
1842 timeout = jiffies + 2*HZ+HZ/2;
1843 while (time_before(jiffies, timeout))
1844 if (!(st_mfp.par_dt_reg & 0x20))
1845 break;
1846
1847 status = FDC_READ( FDCREG_STATUS );
1848 ok = (status & FDCSTAT_TR00) != 0;
1849
1850 /* force interrupt to abort restore operation (FDC would try
1851 * about 50 seconds!) */
1852 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1853 udelay(500);
1854 status = FDC_READ( FDCREG_STATUS );
1855 udelay(20);
1856
1857 if (ok) {
1858 /* dummy seek command to make WP bit accessible */
1859 FDC_WRITE( FDCREG_DATA, 0 );
1860 FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK );
1861 while( st_mfp.par_dt_reg & 0x20 )
1862 ;
1863 status = FDC_READ( FDCREG_STATUS );
1864 }
1865
1866 atari_turnon_irq( IRQ_MFP_FDC );
1867 return( ok );
1868 }
1869
1870
1871 /* Look how many and which kind of drives are connected. If there are
1872 * floppies, additionally start the disk-change and motor-off timers.
1873 */
1874
config_types(void)1875 static void __init config_types( void )
1876 {
1877 int drive, cnt = 0;
1878
1879 /* for probing drives, set the FDC speed to 8 MHz */
1880 if (ATARIHW_PRESENT(FDCSPEED))
1881 dma_wd.fdc_speed = 0;
1882
1883 printk(KERN_INFO "Probing floppy drive(s):\n");
1884 for( drive = 0; drive < FD_MAX_UNITS; drive++ ) {
1885 fd_probe( drive );
1886 if (UD.connected) {
1887 printk(KERN_INFO "fd%d\n", drive);
1888 ++cnt;
1889 }
1890 }
1891
1892 if (FDC_READ( FDCREG_STATUS ) & FDCSTAT_BUSY) {
1893 /* If FDC is still busy from probing, give it another FORCI
1894 * command to abort the operation. If this isn't done, the FDC
1895 * will interrupt later and its IRQ line stays low, because
1896 * the status register isn't read. And this will block any
1897 * interrupts on this IRQ line :-(
1898 */
1899 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1900 udelay(500);
1901 FDC_READ( FDCREG_STATUS );
1902 udelay(20);
1903 }
1904
1905 if (cnt > 0) {
1906 start_motor_off_timer();
1907 if (cnt == 1) fd_select_drive( 0 );
1908 start_check_change_timer();
1909 }
1910 }
1911
1912 /*
1913 * floppy_open check for aliasing (/dev/fd0 can be the same as
1914 * /dev/PS0 etc), and disallows simultaneous access to the same
1915 * drive with different device numbers.
1916 */
1917
floppy_open(struct gendisk * disk,blk_mode_t mode)1918 static int floppy_open(struct gendisk *disk, blk_mode_t mode)
1919 {
1920 struct atari_floppy_struct *p = disk->private_data;
1921 int type = disk->first_minor >> 2;
1922
1923 DPRINT(("fd_open: type=%d\n",type));
1924 if (p->ref && p->type != type)
1925 return -EBUSY;
1926
1927 if (p->ref == -1 || (p->ref && mode & BLK_OPEN_EXCL))
1928 return -EBUSY;
1929 if (mode & BLK_OPEN_EXCL)
1930 p->ref = -1;
1931 else
1932 p->ref++;
1933
1934 p->type = type;
1935
1936 if (mode & BLK_OPEN_NDELAY)
1937 return 0;
1938
1939 if (mode & (BLK_OPEN_READ | BLK_OPEN_WRITE)) {
1940 if (disk_check_media_change(disk))
1941 floppy_revalidate(disk);
1942 if (mode & BLK_OPEN_WRITE) {
1943 if (p->wpstat) {
1944 if (p->ref < 0)
1945 p->ref = 0;
1946 else
1947 p->ref--;
1948 return -EROFS;
1949 }
1950 }
1951 }
1952 return 0;
1953 }
1954
floppy_unlocked_open(struct gendisk * disk,blk_mode_t mode)1955 static int floppy_unlocked_open(struct gendisk *disk, blk_mode_t mode)
1956 {
1957 int ret;
1958
1959 mutex_lock(&ataflop_mutex);
1960 ret = floppy_open(disk, mode);
1961 mutex_unlock(&ataflop_mutex);
1962
1963 return ret;
1964 }
1965
floppy_release(struct gendisk * disk)1966 static void floppy_release(struct gendisk *disk)
1967 {
1968 struct atari_floppy_struct *p = disk->private_data;
1969 mutex_lock(&ataflop_mutex);
1970 if (p->ref < 0)
1971 p->ref = 0;
1972 else if (!p->ref--) {
1973 printk(KERN_ERR "floppy_release with fd_ref == 0");
1974 p->ref = 0;
1975 }
1976 mutex_unlock(&ataflop_mutex);
1977 }
1978
1979 static const struct block_device_operations floppy_fops = {
1980 .owner = THIS_MODULE,
1981 .open = floppy_unlocked_open,
1982 .release = floppy_release,
1983 .ioctl = fd_ioctl,
1984 .check_events = floppy_check_events,
1985 };
1986
1987 static const struct blk_mq_ops ataflop_mq_ops = {
1988 .queue_rq = ataflop_queue_rq,
1989 };
1990
ataflop_alloc_disk(unsigned int drive,unsigned int type)1991 static int ataflop_alloc_disk(unsigned int drive, unsigned int type)
1992 {
1993 struct gendisk *disk;
1994
1995 disk = blk_mq_alloc_disk(&unit[drive].tag_set, NULL);
1996 if (IS_ERR(disk))
1997 return PTR_ERR(disk);
1998
1999 disk->major = FLOPPY_MAJOR;
2000 disk->first_minor = drive + (type << 2);
2001 disk->minors = 1;
2002 sprintf(disk->disk_name, "fd%d", drive);
2003 disk->fops = &floppy_fops;
2004 disk->flags |= GENHD_FL_NO_PART;
2005 disk->events = DISK_EVENT_MEDIA_CHANGE;
2006 disk->private_data = &unit[drive];
2007 set_capacity(disk, MAX_DISK_SIZE * 2);
2008
2009 unit[drive].disk[type] = disk;
2010 return 0;
2011 }
2012
ataflop_probe(dev_t dev)2013 static void ataflop_probe(dev_t dev)
2014 {
2015 int drive = MINOR(dev) & 3;
2016 int type = MINOR(dev) >> 2;
2017
2018 if (type)
2019 type--;
2020
2021 if (drive >= FD_MAX_UNITS || type >= NUM_DISK_MINORS)
2022 return;
2023 if (unit[drive].disk[type])
2024 return;
2025 if (ataflop_alloc_disk(drive, type))
2026 return;
2027 if (add_disk(unit[drive].disk[type]))
2028 goto cleanup_disk;
2029 unit[drive].registered[type] = true;
2030 return;
2031
2032 cleanup_disk:
2033 put_disk(unit[drive].disk[type]);
2034 unit[drive].disk[type] = NULL;
2035 }
2036
atari_floppy_cleanup(void)2037 static void atari_floppy_cleanup(void)
2038 {
2039 int i;
2040 int type;
2041
2042 for (i = 0; i < FD_MAX_UNITS; i++) {
2043 for (type = 0; type < NUM_DISK_MINORS; type++) {
2044 if (!unit[i].disk[type])
2045 continue;
2046 del_gendisk(unit[i].disk[type]);
2047 put_disk(unit[i].disk[type]);
2048 }
2049 blk_mq_free_tag_set(&unit[i].tag_set);
2050 }
2051
2052 del_timer_sync(&fd_timer);
2053 atari_stram_free(DMABuffer);
2054 }
2055
atari_cleanup_floppy_disk(struct atari_floppy_struct * fs)2056 static void atari_cleanup_floppy_disk(struct atari_floppy_struct *fs)
2057 {
2058 int type;
2059
2060 for (type = 0; type < NUM_DISK_MINORS; type++) {
2061 if (!fs->disk[type])
2062 continue;
2063 if (fs->registered[type])
2064 del_gendisk(fs->disk[type]);
2065 put_disk(fs->disk[type]);
2066 }
2067 blk_mq_free_tag_set(&fs->tag_set);
2068 }
2069
atari_floppy_init(void)2070 static int __init atari_floppy_init (void)
2071 {
2072 int i;
2073 int ret;
2074
2075 if (!MACH_IS_ATARI)
2076 /* Amiga, Mac, ... don't have Atari-compatible floppy :-) */
2077 return -ENODEV;
2078
2079 for (i = 0; i < FD_MAX_UNITS; i++) {
2080 memset(&unit[i].tag_set, 0, sizeof(unit[i].tag_set));
2081 unit[i].tag_set.ops = &ataflop_mq_ops;
2082 unit[i].tag_set.nr_hw_queues = 1;
2083 unit[i].tag_set.nr_maps = 1;
2084 unit[i].tag_set.queue_depth = 2;
2085 unit[i].tag_set.numa_node = NUMA_NO_NODE;
2086 unit[i].tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
2087 ret = blk_mq_alloc_tag_set(&unit[i].tag_set);
2088 if (ret)
2089 goto err;
2090
2091 ret = ataflop_alloc_disk(i, 0);
2092 if (ret) {
2093 blk_mq_free_tag_set(&unit[i].tag_set);
2094 goto err;
2095 }
2096 }
2097
2098 if (UseTrackbuffer < 0)
2099 /* not set by user -> use default: for now, we turn
2100 track buffering off for all Medusas, though it
2101 could be used with ones that have a counter
2102 card. But the test is too hard :-( */
2103 UseTrackbuffer = !MACH_IS_MEDUSA;
2104
2105 /* initialize variables */
2106 SelectedDrive = -1;
2107 BufferDrive = -1;
2108
2109 DMABuffer = atari_stram_alloc(BUFFER_SIZE+512, "ataflop");
2110 if (!DMABuffer) {
2111 printk(KERN_ERR "atari_floppy_init: cannot get dma buffer\n");
2112 ret = -ENOMEM;
2113 goto err;
2114 }
2115 TrackBuffer = DMABuffer + 512;
2116 PhysDMABuffer = atari_stram_to_phys(DMABuffer);
2117 PhysTrackBuffer = virt_to_phys(TrackBuffer);
2118 BufferDrive = BufferSide = BufferTrack = -1;
2119
2120 for (i = 0; i < FD_MAX_UNITS; i++) {
2121 unit[i].track = -1;
2122 unit[i].flags = 0;
2123 ret = add_disk(unit[i].disk[0]);
2124 if (ret)
2125 goto err_out_dma;
2126 unit[i].registered[0] = true;
2127 }
2128
2129 printk(KERN_INFO "Atari floppy driver: max. %cD, %strack buffering\n",
2130 DriveType == 0 ? 'D' : DriveType == 1 ? 'H' : 'E',
2131 UseTrackbuffer ? "" : "no ");
2132 config_types();
2133
2134 ret = __register_blkdev(FLOPPY_MAJOR, "fd", ataflop_probe);
2135 if (ret) {
2136 printk(KERN_ERR "atari_floppy_init: cannot register block device\n");
2137 atari_floppy_cleanup();
2138 }
2139 return ret;
2140
2141 err_out_dma:
2142 atari_stram_free(DMABuffer);
2143 err:
2144 while (--i >= 0)
2145 atari_cleanup_floppy_disk(&unit[i]);
2146
2147 return ret;
2148 }
2149
2150 #ifndef MODULE
atari_floppy_setup(char * str)2151 static int __init atari_floppy_setup(char *str)
2152 {
2153 int ints[3 + FD_MAX_UNITS];
2154 int i;
2155
2156 if (!MACH_IS_ATARI)
2157 return 0;
2158
2159 str = get_options(str, 3 + FD_MAX_UNITS, ints);
2160
2161 if (ints[0] < 1) {
2162 printk(KERN_ERR "ataflop_setup: no arguments!\n" );
2163 return 0;
2164 }
2165 else if (ints[0] > 2+FD_MAX_UNITS) {
2166 printk(KERN_ERR "ataflop_setup: too many arguments\n" );
2167 }
2168
2169 if (ints[1] < 0 || ints[1] > 2)
2170 printk(KERN_ERR "ataflop_setup: bad drive type\n" );
2171 else
2172 DriveType = ints[1];
2173
2174 if (ints[0] >= 2)
2175 UseTrackbuffer = (ints[2] > 0);
2176
2177 for( i = 3; i <= ints[0] && i-3 < FD_MAX_UNITS; ++i ) {
2178 if (ints[i] != 2 && ints[i] != 3 && ints[i] != 6 && ints[i] != 12)
2179 printk(KERN_ERR "ataflop_setup: bad steprate\n" );
2180 else
2181 UserSteprate[i-3] = ints[i];
2182 }
2183 return 1;
2184 }
2185
2186 __setup("floppy=", atari_floppy_setup);
2187 #endif
2188
atari_floppy_exit(void)2189 static void __exit atari_floppy_exit(void)
2190 {
2191 unregister_blkdev(FLOPPY_MAJOR, "fd");
2192 atari_floppy_cleanup();
2193 }
2194
2195 module_init(atari_floppy_init)
2196 module_exit(atari_floppy_exit)
2197
2198 MODULE_LICENSE("GPL");
2199
