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 unsigned int memflags;
750 int ret;
751
752 if (type) {
753 type--;
754 if (type >= NUM_DISK_MINORS ||
755 minor2disktype[type].drive_types > DriveType) {
756 finish_fdc();
757 return -EINVAL;
758 }
759 }
760
761 q = unit[drive].disk[type]->queue;
762 memflags = blk_mq_freeze_queue(q);
763 blk_mq_quiesce_queue(q);
764
765 local_irq_save(flags);
766 stdma_lock(floppy_irq, NULL);
767 atari_turnon_irq( IRQ_MFP_FDC ); /* should be already, just to be sure */
768 local_irq_restore(flags);
769
770 if (type) {
771 type = minor2disktype[type].index;
772 UDT = &atari_disk_type[type];
773 }
774
775 if (!UDT || desc->track >= UDT->blocks/UDT->spt/2 || desc->head >= 2) {
776 finish_fdc();
777 ret = -EINVAL;
778 goto out;
779 }
780
781 nsect = UDT->spt;
782 p = TrackBuffer;
783 /* The track buffer is used for the raw track data, so its
784 contents become invalid! */
785 BufferDrive = -1;
786 /* stop deselect timer */
787 del_timer( &motor_off_timer );
788
789 FILL( 60 * (nsect / 9), 0x4e );
790 for( sect = 0; sect < nsect; ++sect ) {
791 FILL( 12, 0 );
792 FILL( 3, 0xf5 );
793 *p++ = 0xfe;
794 *p++ = desc->track;
795 *p++ = desc->head;
796 *p++ = (nsect + sect - desc->sect_offset) % nsect + 1;
797 *p++ = 2;
798 *p++ = 0xf7;
799 FILL( 22, 0x4e );
800 FILL( 12, 0 );
801 FILL( 3, 0xf5 );
802 *p++ = 0xfb;
803 FILL( 512, 0xe5 );
804 *p++ = 0xf7;
805 FILL( 40, 0x4e );
806 }
807 FILL( TrackBuffer+BUFFER_SIZE-p, 0x4e );
808
809 IsFormatting = 1;
810 FormatError = 0;
811 ReqTrack = desc->track;
812 ReqSide = desc->head;
813 do_fd_action( drive );
814
815 wait_for_completion(&format_wait);
816
817 finish_fdc();
818 ret = FormatError ? -EIO : 0;
819 out:
820 blk_mq_unquiesce_queue(q);
821 blk_mq_unfreeze_queue(q, memflags);
822 return ret;
823 }
824
825
826 /* do_fd_action() is the general procedure for a fd request: All
827 * required parameter settings (drive select, side select, track
828 * position) are checked and set if needed. For each of these
829 * parameters and the actual reading or writing exist two functions:
830 * one that starts the setting (or skips it if possible) and one
831 * callback for the "done" interrupt. Each done func calls the next
832 * set function to propagate the request down to fd_rwsec_done().
833 */
834
do_fd_action(int drive)835 static void do_fd_action( int drive )
836 {
837 DPRINT(("do_fd_action\n"));
838
839 if (UseTrackbuffer && !IsFormatting) {
840 repeat:
841 if (IS_BUFFERED( drive, ReqSide, ReqTrack )) {
842 if (ReqCmd == READ) {
843 copy_buffer( SECTOR_BUFFER(ReqSector), ReqData );
844 if (++ReqCnt < blk_rq_cur_sectors(fd_request)) {
845 /* read next sector */
846 setup_req_params( drive );
847 goto repeat;
848 }
849 else {
850 /* all sectors finished */
851 fd_end_request_cur(BLK_STS_OK);
852 finish_fdc();
853 return;
854 }
855 }
856 else {
857 /* cmd == WRITE, pay attention to track buffer
858 * consistency! */
859 copy_buffer( ReqData, SECTOR_BUFFER(ReqSector) );
860 }
861 }
862 }
863
864 if (SelectedDrive != drive)
865 fd_select_drive( drive );
866
867 if (UD.track == -1)
868 fd_calibrate();
869 else if (UD.track != ReqTrack << UDT->stretch)
870 fd_seek();
871 else if (IsFormatting)
872 fd_writetrack();
873 else
874 fd_rwsec();
875 }
876
877
878 /* Seek to track 0 if the current track is unknown */
879
fd_calibrate(void)880 static void fd_calibrate( void )
881 {
882 if (SUD.track >= 0) {
883 fd_calibrate_done( 0 );
884 return;
885 }
886
887 if (ATARIHW_PRESENT(FDCSPEED))
888 dma_wd.fdc_speed = 0; /* always seek with 8 Mhz */
889 DPRINT(("fd_calibrate\n"));
890 SET_IRQ_HANDLER( fd_calibrate_done );
891 /* we can't verify, since the speed may be incorrect */
892 FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | SUD.steprate );
893
894 NeedSeek = 1;
895 MotorOn = 1;
896 start_timeout();
897 /* wait for IRQ */
898 }
899
900
fd_calibrate_done(int status)901 static void fd_calibrate_done( int status )
902 {
903 DPRINT(("fd_calibrate_done()\n"));
904 stop_timeout();
905
906 /* set the correct speed now */
907 if (ATARIHW_PRESENT(FDCSPEED))
908 dma_wd.fdc_speed = SUDT->fdc_speed;
909 if (status & FDCSTAT_RECNF) {
910 printk(KERN_ERR "fd%d: restore failed\n", SelectedDrive );
911 fd_error();
912 }
913 else {
914 SUD.track = 0;
915 fd_seek();
916 }
917 }
918
919
920 /* Seek the drive to the requested track. The drive must have been
921 * calibrated at some point before this.
922 */
923
fd_seek(void)924 static void fd_seek( void )
925 {
926 if (SUD.track == ReqTrack << SUDT->stretch) {
927 fd_seek_done( 0 );
928 return;
929 }
930
931 if (ATARIHW_PRESENT(FDCSPEED)) {
932 dma_wd.fdc_speed = 0; /* always seek witch 8 Mhz */
933 MFPDELAY();
934 }
935
936 DPRINT(("fd_seek() to track %d\n",ReqTrack));
937 FDC_WRITE( FDCREG_DATA, ReqTrack << SUDT->stretch);
938 udelay(25);
939 SET_IRQ_HANDLER( fd_seek_done );
940 FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK | SUD.steprate );
941
942 MotorOn = 1;
943 set_head_settle_flag();
944 start_timeout();
945 /* wait for IRQ */
946 }
947
948
fd_seek_done(int status)949 static void fd_seek_done( int status )
950 {
951 DPRINT(("fd_seek_done()\n"));
952 stop_timeout();
953
954 /* set the correct speed */
955 if (ATARIHW_PRESENT(FDCSPEED))
956 dma_wd.fdc_speed = SUDT->fdc_speed;
957 if (status & FDCSTAT_RECNF) {
958 printk(KERN_ERR "fd%d: seek error (to track %d)\n",
959 SelectedDrive, ReqTrack );
960 /* we don't know exactly which track we are on now! */
961 SUD.track = -1;
962 fd_error();
963 }
964 else {
965 SUD.track = ReqTrack << SUDT->stretch;
966 NeedSeek = 0;
967 if (IsFormatting)
968 fd_writetrack();
969 else
970 fd_rwsec();
971 }
972 }
973
974
975 /* This does the actual reading/writing after positioning the head
976 * over the correct track.
977 */
978
979 static int MultReadInProgress = 0;
980
981
fd_rwsec(void)982 static void fd_rwsec( void )
983 {
984 unsigned long paddr, flags;
985 unsigned int rwflag, old_motoron;
986 unsigned int track;
987
988 DPRINT(("fd_rwsec(), Sec=%d, Access=%c\n",ReqSector, ReqCmd == WRITE ? 'w' : 'r' ));
989 if (ReqCmd == WRITE) {
990 if (ATARIHW_PRESENT(EXTD_DMA)) {
991 paddr = virt_to_phys(ReqData);
992 }
993 else {
994 copy_buffer( ReqData, DMABuffer );
995 paddr = PhysDMABuffer;
996 }
997 dma_cache_maintenance( paddr, 512, 1 );
998 rwflag = 0x100;
999 }
1000 else {
1001 if (read_track)
1002 paddr = PhysTrackBuffer;
1003 else
1004 paddr = ATARIHW_PRESENT(EXTD_DMA) ?
1005 virt_to_phys(ReqData) : PhysDMABuffer;
1006 rwflag = 0;
1007 }
1008
1009 fd_select_side( ReqSide );
1010
1011 /* Start sector of this operation */
1012 FDC_WRITE( FDCREG_SECTOR, read_track ? 1 : ReqSector );
1013 MFPDELAY();
1014 /* Cheat for track if stretch != 0 */
1015 if (SUDT->stretch) {
1016 track = FDC_READ( FDCREG_TRACK);
1017 MFPDELAY();
1018 FDC_WRITE( FDCREG_TRACK, track >> SUDT->stretch);
1019 }
1020 udelay(25);
1021
1022 /* Setup DMA */
1023 local_irq_save(flags);
1024 dma_wd.dma_lo = (unsigned char)paddr;
1025 MFPDELAY();
1026 paddr >>= 8;
1027 dma_wd.dma_md = (unsigned char)paddr;
1028 MFPDELAY();
1029 paddr >>= 8;
1030 if (ATARIHW_PRESENT(EXTD_DMA))
1031 st_dma_ext_dmahi = (unsigned short)paddr;
1032 else
1033 dma_wd.dma_hi = (unsigned char)paddr;
1034 MFPDELAY();
1035 local_irq_restore(flags);
1036
1037 /* Clear FIFO and switch DMA to correct mode */
1038 dma_wd.dma_mode_status = 0x90 | rwflag;
1039 MFPDELAY();
1040 dma_wd.dma_mode_status = 0x90 | (rwflag ^ 0x100);
1041 MFPDELAY();
1042 dma_wd.dma_mode_status = 0x90 | rwflag;
1043 MFPDELAY();
1044
1045 /* How many sectors for DMA */
1046 dma_wd.fdc_acces_seccount = read_track ? SUDT->spt : 1;
1047
1048 udelay(25);
1049
1050 /* Start operation */
1051 dma_wd.dma_mode_status = FDCSELREG_STP | rwflag;
1052 udelay(25);
1053 SET_IRQ_HANDLER( fd_rwsec_done );
1054 dma_wd.fdc_acces_seccount =
1055 (get_head_settle_flag() |
1056 (rwflag ? FDCCMD_WRSEC : (FDCCMD_RDSEC | (read_track ? FDCCMDADD_M : 0))));
1057
1058 old_motoron = MotorOn;
1059 MotorOn = 1;
1060 NeedSeek = 1;
1061 /* wait for interrupt */
1062
1063 if (read_track) {
1064 /* If reading a whole track, wait about one disk rotation and
1065 * then check if all sectors are read. The FDC will even
1066 * search for the first non-existent sector and need 1 sec to
1067 * recognise that it isn't present :-(
1068 */
1069 MultReadInProgress = 1;
1070 mod_timer(&readtrack_timer,
1071 /* 1 rot. + 5 rot.s if motor was off */
1072 jiffies + HZ/5 + (old_motoron ? 0 : HZ));
1073 }
1074 start_timeout();
1075 }
1076
1077
fd_readtrack_check(struct timer_list * unused)1078 static void fd_readtrack_check(struct timer_list *unused)
1079 {
1080 unsigned long flags, addr, addr2;
1081
1082 local_irq_save(flags);
1083
1084 if (!MultReadInProgress) {
1085 /* This prevents a race condition that could arise if the
1086 * interrupt is triggered while the calling of this timer
1087 * callback function takes place. The IRQ function then has
1088 * already cleared 'MultReadInProgress' when flow of control
1089 * gets here.
1090 */
1091 local_irq_restore(flags);
1092 return;
1093 }
1094
1095 /* get the current DMA address */
1096 /* ++ f.a. read twice to avoid being fooled by switcher */
1097 addr = 0;
1098 do {
1099 addr2 = addr;
1100 addr = dma_wd.dma_lo & 0xff;
1101 MFPDELAY();
1102 addr |= (dma_wd.dma_md & 0xff) << 8;
1103 MFPDELAY();
1104 if (ATARIHW_PRESENT( EXTD_DMA ))
1105 addr |= (st_dma_ext_dmahi & 0xffff) << 16;
1106 else
1107 addr |= (dma_wd.dma_hi & 0xff) << 16;
1108 MFPDELAY();
1109 } while(addr != addr2);
1110
1111 if (addr >= PhysTrackBuffer + SUDT->spt*512) {
1112 /* already read enough data, force an FDC interrupt to stop
1113 * the read operation
1114 */
1115 SET_IRQ_HANDLER( NULL );
1116 MultReadInProgress = 0;
1117 local_irq_restore(flags);
1118 DPRINT(("fd_readtrack_check(): done\n"));
1119 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1120 udelay(25);
1121
1122 /* No error until now -- the FDC would have interrupted
1123 * otherwise!
1124 */
1125 fd_rwsec_done1(0);
1126 }
1127 else {
1128 /* not yet finished, wait another tenth rotation */
1129 local_irq_restore(flags);
1130 DPRINT(("fd_readtrack_check(): not yet finished\n"));
1131 mod_timer(&readtrack_timer, jiffies + HZ/5/10);
1132 }
1133 }
1134
1135
fd_rwsec_done(int status)1136 static void fd_rwsec_done( int status )
1137 {
1138 DPRINT(("fd_rwsec_done()\n"));
1139
1140 if (read_track) {
1141 del_timer(&readtrack_timer);
1142 if (!MultReadInProgress)
1143 return;
1144 MultReadInProgress = 0;
1145 }
1146 fd_rwsec_done1(status);
1147 }
1148
fd_rwsec_done1(int status)1149 static void fd_rwsec_done1(int status)
1150 {
1151 unsigned int track;
1152
1153 stop_timeout();
1154
1155 /* Correct the track if stretch != 0 */
1156 if (SUDT->stretch) {
1157 track = FDC_READ( FDCREG_TRACK);
1158 MFPDELAY();
1159 FDC_WRITE( FDCREG_TRACK, track << SUDT->stretch);
1160 }
1161
1162 if (!UseTrackbuffer) {
1163 dma_wd.dma_mode_status = 0x90;
1164 MFPDELAY();
1165 if (!(dma_wd.dma_mode_status & 0x01)) {
1166 printk(KERN_ERR "fd%d: DMA error\n", SelectedDrive );
1167 goto err_end;
1168 }
1169 }
1170 MFPDELAY();
1171
1172 if (ReqCmd == WRITE && (status & FDCSTAT_WPROT)) {
1173 printk(KERN_NOTICE "fd%d: is write protected\n", SelectedDrive );
1174 goto err_end;
1175 }
1176 if ((status & FDCSTAT_RECNF) &&
1177 /* RECNF is no error after a multiple read when the FDC
1178 searched for a non-existent sector! */
1179 !(read_track && FDC_READ(FDCREG_SECTOR) > SUDT->spt)) {
1180 if (Probing) {
1181 if (SUDT > atari_disk_type) {
1182 if (SUDT[-1].blocks > ReqBlock) {
1183 /* try another disk type */
1184 SUDT--;
1185 set_capacity(unit[SelectedDrive].disk[0],
1186 SUDT->blocks);
1187 } else
1188 Probing = 0;
1189 }
1190 else {
1191 if (SUD.flags & FTD_MSG)
1192 printk(KERN_INFO "fd%d: Auto-detected floppy type %s\n",
1193 SelectedDrive, SUDT->name );
1194 Probing=0;
1195 }
1196 } else {
1197 /* record not found, but not probing. Maybe stretch wrong ? Restart probing */
1198 if (SUD.autoprobe) {
1199 SUDT = atari_disk_type + StartDiskType[DriveType];
1200 set_capacity(unit[SelectedDrive].disk[0],
1201 SUDT->blocks);
1202 Probing = 1;
1203 }
1204 }
1205 if (Probing) {
1206 if (ATARIHW_PRESENT(FDCSPEED)) {
1207 dma_wd.fdc_speed = SUDT->fdc_speed;
1208 MFPDELAY();
1209 }
1210 setup_req_params( SelectedDrive );
1211 BufferDrive = -1;
1212 do_fd_action( SelectedDrive );
1213 return;
1214 }
1215
1216 printk(KERN_ERR "fd%d: sector %d not found (side %d, track %d)\n",
1217 SelectedDrive, FDC_READ (FDCREG_SECTOR), ReqSide, ReqTrack );
1218 goto err_end;
1219 }
1220 if (status & FDCSTAT_CRC) {
1221 printk(KERN_ERR "fd%d: CRC error (side %d, track %d, sector %d)\n",
1222 SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) );
1223 goto err_end;
1224 }
1225 if (status & FDCSTAT_LOST) {
1226 printk(KERN_ERR "fd%d: lost data (side %d, track %d, sector %d)\n",
1227 SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) );
1228 goto err_end;
1229 }
1230
1231 Probing = 0;
1232
1233 if (ReqCmd == READ) {
1234 if (!read_track) {
1235 void *addr;
1236 addr = ATARIHW_PRESENT( EXTD_DMA ) ? ReqData : DMABuffer;
1237 dma_cache_maintenance( virt_to_phys(addr), 512, 0 );
1238 if (!ATARIHW_PRESENT( EXTD_DMA ))
1239 copy_buffer (addr, ReqData);
1240 } else {
1241 dma_cache_maintenance( PhysTrackBuffer, MaxSectors[DriveType] * 512, 0 );
1242 BufferDrive = SelectedDrive;
1243 BufferSide = ReqSide;
1244 BufferTrack = ReqTrack;
1245 copy_buffer (SECTOR_BUFFER (ReqSector), ReqData);
1246 }
1247 }
1248
1249 if (++ReqCnt < blk_rq_cur_sectors(fd_request)) {
1250 /* read next sector */
1251 setup_req_params( SelectedDrive );
1252 do_fd_action( SelectedDrive );
1253 }
1254 else {
1255 /* all sectors finished */
1256 fd_end_request_cur(BLK_STS_OK);
1257 finish_fdc();
1258 }
1259 return;
1260
1261 err_end:
1262 BufferDrive = -1;
1263 fd_error();
1264 }
1265
1266
fd_writetrack(void)1267 static void fd_writetrack( void )
1268 {
1269 unsigned long paddr, flags;
1270 unsigned int track;
1271
1272 DPRINT(("fd_writetrack() Tr=%d Si=%d\n", ReqTrack, ReqSide ));
1273
1274 paddr = PhysTrackBuffer;
1275 dma_cache_maintenance( paddr, BUFFER_SIZE, 1 );
1276
1277 fd_select_side( ReqSide );
1278
1279 /* Cheat for track if stretch != 0 */
1280 if (SUDT->stretch) {
1281 track = FDC_READ( FDCREG_TRACK);
1282 MFPDELAY();
1283 FDC_WRITE(FDCREG_TRACK,track >> SUDT->stretch);
1284 }
1285 udelay(40);
1286
1287 /* Setup DMA */
1288 local_irq_save(flags);
1289 dma_wd.dma_lo = (unsigned char)paddr;
1290 MFPDELAY();
1291 paddr >>= 8;
1292 dma_wd.dma_md = (unsigned char)paddr;
1293 MFPDELAY();
1294 paddr >>= 8;
1295 if (ATARIHW_PRESENT( EXTD_DMA ))
1296 st_dma_ext_dmahi = (unsigned short)paddr;
1297 else
1298 dma_wd.dma_hi = (unsigned char)paddr;
1299 MFPDELAY();
1300 local_irq_restore(flags);
1301
1302 /* Clear FIFO and switch DMA to correct mode */
1303 dma_wd.dma_mode_status = 0x190;
1304 MFPDELAY();
1305 dma_wd.dma_mode_status = 0x90;
1306 MFPDELAY();
1307 dma_wd.dma_mode_status = 0x190;
1308 MFPDELAY();
1309
1310 /* How many sectors for DMA */
1311 dma_wd.fdc_acces_seccount = BUFFER_SIZE/512;
1312 udelay(40);
1313
1314 /* Start operation */
1315 dma_wd.dma_mode_status = FDCSELREG_STP | 0x100;
1316 udelay(40);
1317 SET_IRQ_HANDLER( fd_writetrack_done );
1318 dma_wd.fdc_acces_seccount = FDCCMD_WRTRA | get_head_settle_flag();
1319
1320 MotorOn = 1;
1321 start_timeout();
1322 /* wait for interrupt */
1323 }
1324
1325
fd_writetrack_done(int status)1326 static void fd_writetrack_done( int status )
1327 {
1328 DPRINT(("fd_writetrack_done()\n"));
1329
1330 stop_timeout();
1331
1332 if (status & FDCSTAT_WPROT) {
1333 printk(KERN_NOTICE "fd%d: is write protected\n", SelectedDrive );
1334 goto err_end;
1335 }
1336 if (status & FDCSTAT_LOST) {
1337 printk(KERN_ERR "fd%d: lost data (side %d, track %d)\n",
1338 SelectedDrive, ReqSide, ReqTrack );
1339 goto err_end;
1340 }
1341
1342 complete(&format_wait);
1343 return;
1344
1345 err_end:
1346 fd_error();
1347 }
1348
fd_times_out(struct timer_list * unused)1349 static void fd_times_out(struct timer_list *unused)
1350 {
1351 atari_disable_irq( IRQ_MFP_FDC );
1352 if (!FloppyIRQHandler) goto end; /* int occurred after timer was fired, but
1353 * before we came here... */
1354
1355 SET_IRQ_HANDLER( NULL );
1356 /* If the timeout occurred while the readtrack_check timer was
1357 * active, we need to cancel it, else bad things will happen */
1358 if (UseTrackbuffer)
1359 del_timer( &readtrack_timer );
1360 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1361 udelay( 25 );
1362
1363 printk(KERN_ERR "floppy timeout\n" );
1364 fd_error();
1365 end:
1366 atari_enable_irq( IRQ_MFP_FDC );
1367 }
1368
1369
1370 /* The (noop) seek operation here is needed to make the WP bit in the
1371 * FDC status register accessible for check_change. If the last disk
1372 * operation would have been a RDSEC, this bit would always read as 0
1373 * no matter what :-( To save time, the seek goes to the track we're
1374 * already on.
1375 */
1376
finish_fdc(void)1377 static void finish_fdc( void )
1378 {
1379 if (!NeedSeek || !stdma_is_locked_by(floppy_irq)) {
1380 finish_fdc_done( 0 );
1381 }
1382 else {
1383 DPRINT(("finish_fdc: dummy seek started\n"));
1384 FDC_WRITE (FDCREG_DATA, SUD.track);
1385 SET_IRQ_HANDLER( finish_fdc_done );
1386 FDC_WRITE (FDCREG_CMD, FDCCMD_SEEK);
1387 MotorOn = 1;
1388 start_timeout();
1389 /* we must wait for the IRQ here, because the ST-DMA
1390 is released immediately afterwards and the interrupt
1391 may be delivered to the wrong driver. */
1392 }
1393 }
1394
1395
finish_fdc_done(int dummy)1396 static void finish_fdc_done( int dummy )
1397 {
1398 unsigned long flags;
1399
1400 DPRINT(("finish_fdc_done entered\n"));
1401 stop_timeout();
1402 NeedSeek = 0;
1403
1404 if (timer_pending(&fd_timer) && time_before(fd_timer.expires, jiffies + 5))
1405 /* If the check for a disk change is done too early after this
1406 * last seek command, the WP bit still reads wrong :-((
1407 */
1408 mod_timer(&fd_timer, jiffies + 5);
1409 else
1410 start_check_change_timer();
1411 start_motor_off_timer();
1412
1413 local_irq_save(flags);
1414 if (stdma_is_locked_by(floppy_irq))
1415 stdma_release();
1416 local_irq_restore(flags);
1417
1418 DPRINT(("finish_fdc() finished\n"));
1419 }
1420
1421 /* The detection of disk changes is a dark chapter in Atari history :-(
1422 * Because the "Drive ready" signal isn't present in the Atari
1423 * hardware, one has to rely on the "Write Protect". This works fine,
1424 * as long as no write protected disks are used. TOS solves this
1425 * problem by introducing tri-state logic ("maybe changed") and
1426 * looking at the serial number in block 0. This isn't possible for
1427 * Linux, since the floppy driver can't make assumptions about the
1428 * filesystem used on the disk and thus the contents of block 0. I've
1429 * chosen the method to always say "The disk was changed" if it is
1430 * unsure whether it was. This implies that every open or mount
1431 * invalidates the disk buffers if you work with write protected
1432 * disks. But at least this is better than working with incorrect data
1433 * due to unrecognised disk changes.
1434 */
1435
floppy_check_events(struct gendisk * disk,unsigned int clearing)1436 static unsigned int floppy_check_events(struct gendisk *disk,
1437 unsigned int clearing)
1438 {
1439 struct atari_floppy_struct *p = disk->private_data;
1440 unsigned int drive = p - unit;
1441 if (test_bit (drive, &fake_change)) {
1442 /* simulated change (e.g. after formatting) */
1443 return DISK_EVENT_MEDIA_CHANGE;
1444 }
1445 if (test_bit (drive, &changed_floppies)) {
1446 /* surely changed (the WP signal changed at least once) */
1447 return DISK_EVENT_MEDIA_CHANGE;
1448 }
1449 if (UD.wpstat) {
1450 /* WP is on -> could be changed: to be sure, buffers should be
1451 * invalidated...
1452 */
1453 return DISK_EVENT_MEDIA_CHANGE;
1454 }
1455
1456 return 0;
1457 }
1458
floppy_revalidate(struct gendisk * disk)1459 static int floppy_revalidate(struct gendisk *disk)
1460 {
1461 struct atari_floppy_struct *p = disk->private_data;
1462 unsigned int drive = p - unit;
1463
1464 if (test_bit(drive, &changed_floppies) ||
1465 test_bit(drive, &fake_change) || !p->disktype) {
1466 if (UD.flags & FTD_MSG)
1467 printk(KERN_ERR "floppy: clear format %p!\n", UDT);
1468 BufferDrive = -1;
1469 clear_bit(drive, &fake_change);
1470 clear_bit(drive, &changed_floppies);
1471 /* MSch: clearing geometry makes sense only for autoprobe
1472 formats, for 'permanent user-defined' parameter:
1473 restore default_params[] here if flagged valid! */
1474 if (default_params[drive].blocks == 0)
1475 UDT = NULL;
1476 else
1477 UDT = &default_params[drive];
1478 }
1479 return 0;
1480 }
1481
1482
1483 /* This sets up the global variables describing the current request. */
1484
setup_req_params(int drive)1485 static void setup_req_params( int drive )
1486 {
1487 int block = ReqBlock + ReqCnt;
1488
1489 ReqTrack = block / UDT->spt;
1490 ReqSector = block - ReqTrack * UDT->spt + 1;
1491 ReqSide = ReqTrack & 1;
1492 ReqTrack >>= 1;
1493 ReqData = ReqBuffer + 512 * ReqCnt;
1494
1495 if (UseTrackbuffer)
1496 read_track = (ReqCmd == READ && unit[drive].error_count == 0);
1497 else
1498 read_track = 0;
1499
1500 DPRINT(("Request params: Si=%d Tr=%d Se=%d Data=%08lx\n",ReqSide,
1501 ReqTrack, ReqSector, (unsigned long)ReqData ));
1502 }
1503
ataflop_queue_rq(struct blk_mq_hw_ctx * hctx,const struct blk_mq_queue_data * bd)1504 static blk_status_t ataflop_queue_rq(struct blk_mq_hw_ctx *hctx,
1505 const struct blk_mq_queue_data *bd)
1506 {
1507 struct atari_floppy_struct *floppy = bd->rq->q->disk->private_data;
1508 int drive = floppy - unit;
1509 int type = floppy->type;
1510
1511 DPRINT(("Queue request: drive %d type %d sectors %d of %d last %d\n",
1512 drive, type, blk_rq_cur_sectors(bd->rq),
1513 blk_rq_sectors(bd->rq), bd->last));
1514
1515 spin_lock_irq(&ataflop_lock);
1516 if (fd_request) {
1517 spin_unlock_irq(&ataflop_lock);
1518 return BLK_STS_DEV_RESOURCE;
1519 }
1520 if (!stdma_try_lock(floppy_irq, NULL)) {
1521 spin_unlock_irq(&ataflop_lock);
1522 return BLK_STS_RESOURCE;
1523 }
1524 fd_request = bd->rq;
1525 unit[drive].error_count = 0;
1526 blk_mq_start_request(fd_request);
1527
1528 atari_disable_irq( IRQ_MFP_FDC );
1529
1530 IsFormatting = 0;
1531
1532 if (!UD.connected) {
1533 /* drive not connected */
1534 printk(KERN_ERR "Unknown Device: fd%d\n", drive );
1535 fd_end_request_cur(BLK_STS_IOERR);
1536 stdma_release();
1537 goto out;
1538 }
1539
1540 if (type == 0) {
1541 if (!UDT) {
1542 Probing = 1;
1543 UDT = atari_disk_type + StartDiskType[DriveType];
1544 set_capacity(bd->rq->q->disk, UDT->blocks);
1545 UD.autoprobe = 1;
1546 }
1547 }
1548 else {
1549 /* user supplied disk type */
1550 if (--type >= NUM_DISK_MINORS) {
1551 printk(KERN_WARNING "fd%d: invalid disk format", drive );
1552 fd_end_request_cur(BLK_STS_IOERR);
1553 stdma_release();
1554 goto out;
1555 }
1556 if (minor2disktype[type].drive_types > DriveType) {
1557 printk(KERN_WARNING "fd%d: unsupported disk format", drive );
1558 fd_end_request_cur(BLK_STS_IOERR);
1559 stdma_release();
1560 goto out;
1561 }
1562 type = minor2disktype[type].index;
1563 UDT = &atari_disk_type[type];
1564 set_capacity(bd->rq->q->disk, UDT->blocks);
1565 UD.autoprobe = 0;
1566 }
1567
1568 /* stop deselect timer */
1569 del_timer( &motor_off_timer );
1570
1571 ReqCnt = 0;
1572 ReqCmd = rq_data_dir(fd_request);
1573 ReqBlock = blk_rq_pos(fd_request);
1574 ReqBuffer = bio_data(fd_request->bio);
1575 setup_req_params( drive );
1576 do_fd_action( drive );
1577
1578 atari_enable_irq( IRQ_MFP_FDC );
1579
1580 out:
1581 spin_unlock_irq(&ataflop_lock);
1582 return BLK_STS_OK;
1583 }
1584
fd_locked_ioctl(struct block_device * bdev,blk_mode_t mode,unsigned int cmd,unsigned long param)1585 static int fd_locked_ioctl(struct block_device *bdev, blk_mode_t mode,
1586 unsigned int cmd, unsigned long param)
1587 {
1588 struct gendisk *disk = bdev->bd_disk;
1589 struct atari_floppy_struct *floppy = disk->private_data;
1590 int drive = floppy - unit;
1591 int type = floppy->type;
1592 struct atari_format_descr fmt_desc;
1593 struct atari_disk_type *dtp;
1594 struct floppy_struct getprm;
1595 int settype;
1596 struct floppy_struct setprm;
1597 void __user *argp = (void __user *)param;
1598
1599 switch (cmd) {
1600 case FDGETPRM:
1601 if (type) {
1602 if (--type >= NUM_DISK_MINORS)
1603 return -ENODEV;
1604 if (minor2disktype[type].drive_types > DriveType)
1605 return -ENODEV;
1606 type = minor2disktype[type].index;
1607 dtp = &atari_disk_type[type];
1608 if (UD.flags & FTD_MSG)
1609 printk (KERN_ERR "floppy%d: found dtp %p name %s!\n",
1610 drive, dtp, dtp->name);
1611 }
1612 else {
1613 if (!UDT)
1614 return -ENXIO;
1615 else
1616 dtp = UDT;
1617 }
1618 memset((void *)&getprm, 0, sizeof(getprm));
1619 getprm.size = dtp->blocks;
1620 getprm.sect = dtp->spt;
1621 getprm.head = 2;
1622 getprm.track = dtp->blocks/dtp->spt/2;
1623 getprm.stretch = dtp->stretch;
1624 if (copy_to_user(argp, &getprm, sizeof(getprm)))
1625 return -EFAULT;
1626 return 0;
1627 }
1628 switch (cmd) {
1629 case FDSETPRM:
1630 case FDDEFPRM:
1631 /*
1632 * MSch 7/96: simple 'set geometry' case: just set the
1633 * 'default' device params (minor == 0).
1634 * Currently, the drive geometry is cleared after each
1635 * disk change and subsequent revalidate()! simple
1636 * implementation of FDDEFPRM: save geometry from a
1637 * FDDEFPRM call and restore it in floppy_revalidate() !
1638 */
1639
1640 /* get the parameters from user space */
1641 if (floppy->ref != 1 && floppy->ref != -1)
1642 return -EBUSY;
1643 if (copy_from_user(&setprm, argp, sizeof(setprm)))
1644 return -EFAULT;
1645 /*
1646 * first of all: check for floppy change and revalidate,
1647 * or the next access will revalidate - and clear UDT :-(
1648 */
1649
1650 if (floppy_check_events(disk, 0))
1651 floppy_revalidate(disk);
1652
1653 if (UD.flags & FTD_MSG)
1654 printk (KERN_INFO "floppy%d: setting size %d spt %d str %d!\n",
1655 drive, setprm.size, setprm.sect, setprm.stretch);
1656
1657 /* what if type > 0 here? Overwrite specified entry ? */
1658 if (type) {
1659 /* refuse to re-set a predefined type for now */
1660 finish_fdc();
1661 return -EINVAL;
1662 }
1663
1664 /*
1665 * type == 0: first look for a matching entry in the type list,
1666 * and set the UD.disktype field to use the perdefined entry.
1667 * TODO: add user-defined format to head of autoprobe list ?
1668 * Useful to include the user-type for future autodetection!
1669 */
1670
1671 for (settype = 0; settype < NUM_DISK_MINORS; settype++) {
1672 int setidx = 0;
1673 if (minor2disktype[settype].drive_types > DriveType) {
1674 /* skip this one, invalid for drive ... */
1675 continue;
1676 }
1677 setidx = minor2disktype[settype].index;
1678 dtp = &atari_disk_type[setidx];
1679
1680 /* found matching entry ?? */
1681 if ( dtp->blocks == setprm.size
1682 && dtp->spt == setprm.sect
1683 && dtp->stretch == setprm.stretch ) {
1684 if (UD.flags & FTD_MSG)
1685 printk (KERN_INFO "floppy%d: setting %s %p!\n",
1686 drive, dtp->name, dtp);
1687 UDT = dtp;
1688 set_capacity(disk, UDT->blocks);
1689
1690 if (cmd == FDDEFPRM) {
1691 /* save settings as permanent default type */
1692 default_params[drive].name = dtp->name;
1693 default_params[drive].spt = dtp->spt;
1694 default_params[drive].blocks = dtp->blocks;
1695 default_params[drive].fdc_speed = dtp->fdc_speed;
1696 default_params[drive].stretch = dtp->stretch;
1697 }
1698
1699 return 0;
1700 }
1701
1702 }
1703
1704 /* no matching disk type found above - setting user_params */
1705
1706 if (cmd == FDDEFPRM) {
1707 /* set permanent type */
1708 dtp = &default_params[drive];
1709 } else
1710 /* set user type (reset by disk change!) */
1711 dtp = &user_params[drive];
1712
1713 dtp->name = "user format";
1714 dtp->blocks = setprm.size;
1715 dtp->spt = setprm.sect;
1716 if (setprm.sect > 14)
1717 dtp->fdc_speed = 3;
1718 else
1719 dtp->fdc_speed = 0;
1720 dtp->stretch = setprm.stretch;
1721
1722 if (UD.flags & FTD_MSG)
1723 printk (KERN_INFO "floppy%d: blk %d spt %d str %d!\n",
1724 drive, dtp->blocks, dtp->spt, dtp->stretch);
1725
1726 /* sanity check */
1727 if (setprm.track != dtp->blocks/dtp->spt/2 ||
1728 setprm.head != 2) {
1729 finish_fdc();
1730 return -EINVAL;
1731 }
1732
1733 UDT = dtp;
1734 set_capacity(disk, UDT->blocks);
1735
1736 return 0;
1737 case FDMSGON:
1738 UD.flags |= FTD_MSG;
1739 return 0;
1740 case FDMSGOFF:
1741 UD.flags &= ~FTD_MSG;
1742 return 0;
1743 case FDSETEMSGTRESH:
1744 return -EINVAL;
1745 case FDFMTBEG:
1746 return 0;
1747 case FDFMTTRK:
1748 if (floppy->ref != 1 && floppy->ref != -1)
1749 return -EBUSY;
1750 if (copy_from_user(&fmt_desc, argp, sizeof(fmt_desc)))
1751 return -EFAULT;
1752 return do_format(drive, type, &fmt_desc);
1753 case FDCLRPRM:
1754 UDT = NULL;
1755 /* MSch: invalidate default_params */
1756 default_params[drive].blocks = 0;
1757 set_capacity(disk, MAX_DISK_SIZE * 2);
1758 fallthrough;
1759 case FDFMTEND:
1760 case FDFLUSH:
1761 /* invalidate the buffer track to force a reread */
1762 BufferDrive = -1;
1763 set_bit(drive, &fake_change);
1764 if (disk_check_media_change(disk)) {
1765 bdev_mark_dead(disk->part0, true);
1766 floppy_revalidate(disk);
1767 }
1768 return 0;
1769 default:
1770 return -EINVAL;
1771 }
1772 }
1773
fd_ioctl(struct block_device * bdev,blk_mode_t mode,unsigned int cmd,unsigned long arg)1774 static int fd_ioctl(struct block_device *bdev, blk_mode_t mode,
1775 unsigned int cmd, unsigned long arg)
1776 {
1777 int ret;
1778
1779 mutex_lock(&ataflop_mutex);
1780 ret = fd_locked_ioctl(bdev, mode, cmd, arg);
1781 mutex_unlock(&ataflop_mutex);
1782
1783 return ret;
1784 }
1785
1786 /* Initialize the 'unit' variable for drive 'drive' */
1787
fd_probe(int drive)1788 static void __init fd_probe( int drive )
1789 {
1790 UD.connected = 0;
1791 UDT = NULL;
1792
1793 if (!fd_test_drive_present( drive ))
1794 return;
1795
1796 UD.connected = 1;
1797 UD.track = 0;
1798 switch( UserSteprate[drive] ) {
1799 case 2:
1800 UD.steprate = FDCSTEP_2;
1801 break;
1802 case 3:
1803 UD.steprate = FDCSTEP_3;
1804 break;
1805 case 6:
1806 UD.steprate = FDCSTEP_6;
1807 break;
1808 case 12:
1809 UD.steprate = FDCSTEP_12;
1810 break;
1811 default: /* should be -1 for "not set by user" */
1812 if (ATARIHW_PRESENT( FDCSPEED ) || MACH_IS_MEDUSA)
1813 UD.steprate = FDCSTEP_3;
1814 else
1815 UD.steprate = FDCSTEP_6;
1816 break;
1817 }
1818 MotorOn = 1; /* from probe restore operation! */
1819 }
1820
1821
1822 /* This function tests the physical presence of a floppy drive (not
1823 * whether a disk is inserted). This is done by issuing a restore
1824 * command, waiting max. 2 seconds (that should be enough to move the
1825 * head across the whole disk) and looking at the state of the "TR00"
1826 * signal. This should now be raised if there is a drive connected
1827 * (and there is no hardware failure :-) Otherwise, the drive is
1828 * declared absent.
1829 */
1830
fd_test_drive_present(int drive)1831 static int __init fd_test_drive_present( int drive )
1832 {
1833 unsigned long timeout;
1834 unsigned char status;
1835 int ok;
1836
1837 if (drive >= (MACH_IS_FALCON ? 1 : 2)) return( 0 );
1838 fd_select_drive( drive );
1839
1840 /* disable interrupt temporarily */
1841 atari_turnoff_irq( IRQ_MFP_FDC );
1842 FDC_WRITE (FDCREG_TRACK, 0xff00);
1843 FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | FDCCMDADD_H | FDCSTEP_6 );
1844
1845 timeout = jiffies + 2*HZ+HZ/2;
1846 while (time_before(jiffies, timeout))
1847 if (!(st_mfp.par_dt_reg & 0x20))
1848 break;
1849
1850 status = FDC_READ( FDCREG_STATUS );
1851 ok = (status & FDCSTAT_TR00) != 0;
1852
1853 /* force interrupt to abort restore operation (FDC would try
1854 * about 50 seconds!) */
1855 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1856 udelay(500);
1857 status = FDC_READ( FDCREG_STATUS );
1858 udelay(20);
1859
1860 if (ok) {
1861 /* dummy seek command to make WP bit accessible */
1862 FDC_WRITE( FDCREG_DATA, 0 );
1863 FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK );
1864 while( st_mfp.par_dt_reg & 0x20 )
1865 ;
1866 status = FDC_READ( FDCREG_STATUS );
1867 }
1868
1869 atari_turnon_irq( IRQ_MFP_FDC );
1870 return( ok );
1871 }
1872
1873
1874 /* Look how many and which kind of drives are connected. If there are
1875 * floppies, additionally start the disk-change and motor-off timers.
1876 */
1877
config_types(void)1878 static void __init config_types( void )
1879 {
1880 int drive, cnt = 0;
1881
1882 /* for probing drives, set the FDC speed to 8 MHz */
1883 if (ATARIHW_PRESENT(FDCSPEED))
1884 dma_wd.fdc_speed = 0;
1885
1886 printk(KERN_INFO "Probing floppy drive(s):\n");
1887 for( drive = 0; drive < FD_MAX_UNITS; drive++ ) {
1888 fd_probe( drive );
1889 if (UD.connected) {
1890 printk(KERN_INFO "fd%d\n", drive);
1891 ++cnt;
1892 }
1893 }
1894
1895 if (FDC_READ( FDCREG_STATUS ) & FDCSTAT_BUSY) {
1896 /* If FDC is still busy from probing, give it another FORCI
1897 * command to abort the operation. If this isn't done, the FDC
1898 * will interrupt later and its IRQ line stays low, because
1899 * the status register isn't read. And this will block any
1900 * interrupts on this IRQ line :-(
1901 */
1902 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1903 udelay(500);
1904 FDC_READ( FDCREG_STATUS );
1905 udelay(20);
1906 }
1907
1908 if (cnt > 0) {
1909 start_motor_off_timer();
1910 if (cnt == 1) fd_select_drive( 0 );
1911 start_check_change_timer();
1912 }
1913 }
1914
1915 /*
1916 * floppy_open check for aliasing (/dev/fd0 can be the same as
1917 * /dev/PS0 etc), and disallows simultaneous access to the same
1918 * drive with different device numbers.
1919 */
1920
floppy_open(struct gendisk * disk,blk_mode_t mode)1921 static int floppy_open(struct gendisk *disk, blk_mode_t mode)
1922 {
1923 struct atari_floppy_struct *p = disk->private_data;
1924 int type = disk->first_minor >> 2;
1925
1926 DPRINT(("fd_open: type=%d\n",type));
1927 if (p->ref && p->type != type)
1928 return -EBUSY;
1929
1930 if (p->ref == -1 || (p->ref && mode & BLK_OPEN_EXCL))
1931 return -EBUSY;
1932 if (mode & BLK_OPEN_EXCL)
1933 p->ref = -1;
1934 else
1935 p->ref++;
1936
1937 p->type = type;
1938
1939 if (mode & BLK_OPEN_NDELAY)
1940 return 0;
1941
1942 if (mode & (BLK_OPEN_READ | BLK_OPEN_WRITE)) {
1943 if (disk_check_media_change(disk))
1944 floppy_revalidate(disk);
1945 if (mode & BLK_OPEN_WRITE) {
1946 if (p->wpstat) {
1947 if (p->ref < 0)
1948 p->ref = 0;
1949 else
1950 p->ref--;
1951 return -EROFS;
1952 }
1953 }
1954 }
1955 return 0;
1956 }
1957
floppy_unlocked_open(struct gendisk * disk,blk_mode_t mode)1958 static int floppy_unlocked_open(struct gendisk *disk, blk_mode_t mode)
1959 {
1960 int ret;
1961
1962 mutex_lock(&ataflop_mutex);
1963 ret = floppy_open(disk, mode);
1964 mutex_unlock(&ataflop_mutex);
1965
1966 return ret;
1967 }
1968
floppy_release(struct gendisk * disk)1969 static void floppy_release(struct gendisk *disk)
1970 {
1971 struct atari_floppy_struct *p = disk->private_data;
1972 mutex_lock(&ataflop_mutex);
1973 if (p->ref < 0)
1974 p->ref = 0;
1975 else if (!p->ref--) {
1976 printk(KERN_ERR "floppy_release with fd_ref == 0");
1977 p->ref = 0;
1978 }
1979 mutex_unlock(&ataflop_mutex);
1980 }
1981
1982 static const struct block_device_operations floppy_fops = {
1983 .owner = THIS_MODULE,
1984 .open = floppy_unlocked_open,
1985 .release = floppy_release,
1986 .ioctl = fd_ioctl,
1987 .check_events = floppy_check_events,
1988 };
1989
1990 static const struct blk_mq_ops ataflop_mq_ops = {
1991 .queue_rq = ataflop_queue_rq,
1992 };
1993
ataflop_alloc_disk(unsigned int drive,unsigned int type)1994 static int ataflop_alloc_disk(unsigned int drive, unsigned int type)
1995 {
1996 struct queue_limits lim = {
1997 .features = BLK_FEAT_ROTATIONAL,
1998 };
1999 struct gendisk *disk;
2000
2001 disk = blk_mq_alloc_disk(&unit[drive].tag_set, &lim, NULL);
2002 if (IS_ERR(disk))
2003 return PTR_ERR(disk);
2004
2005 disk->major = FLOPPY_MAJOR;
2006 disk->first_minor = drive + (type << 2);
2007 disk->minors = 1;
2008 sprintf(disk->disk_name, "fd%d", drive);
2009 disk->fops = &floppy_fops;
2010 disk->flags |= GENHD_FL_NO_PART;
2011 disk->events = DISK_EVENT_MEDIA_CHANGE;
2012 disk->private_data = &unit[drive];
2013 set_capacity(disk, MAX_DISK_SIZE * 2);
2014
2015 unit[drive].disk[type] = disk;
2016 return 0;
2017 }
2018
ataflop_probe(dev_t dev)2019 static void ataflop_probe(dev_t dev)
2020 {
2021 int drive = MINOR(dev) & 3;
2022 int type = MINOR(dev) >> 2;
2023
2024 if (type)
2025 type--;
2026
2027 if (drive >= FD_MAX_UNITS || type >= NUM_DISK_MINORS)
2028 return;
2029 if (unit[drive].disk[type])
2030 return;
2031 if (ataflop_alloc_disk(drive, type))
2032 return;
2033 if (add_disk(unit[drive].disk[type]))
2034 goto cleanup_disk;
2035 unit[drive].registered[type] = true;
2036 return;
2037
2038 cleanup_disk:
2039 put_disk(unit[drive].disk[type]);
2040 unit[drive].disk[type] = NULL;
2041 }
2042
atari_floppy_cleanup(void)2043 static void atari_floppy_cleanup(void)
2044 {
2045 int i;
2046 int type;
2047
2048 for (i = 0; i < FD_MAX_UNITS; i++) {
2049 for (type = 0; type < NUM_DISK_MINORS; type++) {
2050 if (!unit[i].disk[type])
2051 continue;
2052 del_gendisk(unit[i].disk[type]);
2053 put_disk(unit[i].disk[type]);
2054 }
2055 blk_mq_free_tag_set(&unit[i].tag_set);
2056 }
2057
2058 del_timer_sync(&fd_timer);
2059 atari_stram_free(DMABuffer);
2060 }
2061
atari_cleanup_floppy_disk(struct atari_floppy_struct * fs)2062 static void atari_cleanup_floppy_disk(struct atari_floppy_struct *fs)
2063 {
2064 int type;
2065
2066 for (type = 0; type < NUM_DISK_MINORS; type++) {
2067 if (!fs->disk[type])
2068 continue;
2069 if (fs->registered[type])
2070 del_gendisk(fs->disk[type]);
2071 put_disk(fs->disk[type]);
2072 }
2073 blk_mq_free_tag_set(&fs->tag_set);
2074 }
2075
atari_floppy_init(void)2076 static int __init atari_floppy_init (void)
2077 {
2078 int i;
2079 int ret;
2080
2081 if (!MACH_IS_ATARI)
2082 /* Amiga, Mac, ... don't have Atari-compatible floppy :-) */
2083 return -ENODEV;
2084
2085 for (i = 0; i < FD_MAX_UNITS; i++) {
2086 memset(&unit[i].tag_set, 0, sizeof(unit[i].tag_set));
2087 unit[i].tag_set.ops = &ataflop_mq_ops;
2088 unit[i].tag_set.nr_hw_queues = 1;
2089 unit[i].tag_set.nr_maps = 1;
2090 unit[i].tag_set.queue_depth = 2;
2091 unit[i].tag_set.numa_node = NUMA_NO_NODE;
2092 ret = blk_mq_alloc_tag_set(&unit[i].tag_set);
2093 if (ret)
2094 goto err;
2095
2096 ret = ataflop_alloc_disk(i, 0);
2097 if (ret) {
2098 blk_mq_free_tag_set(&unit[i].tag_set);
2099 goto err;
2100 }
2101 }
2102
2103 if (UseTrackbuffer < 0)
2104 /* not set by user -> use default: for now, we turn
2105 track buffering off for all Medusas, though it
2106 could be used with ones that have a counter
2107 card. But the test is too hard :-( */
2108 UseTrackbuffer = !MACH_IS_MEDUSA;
2109
2110 /* initialize variables */
2111 SelectedDrive = -1;
2112 BufferDrive = -1;
2113
2114 DMABuffer = atari_stram_alloc(BUFFER_SIZE+512, "ataflop");
2115 if (!DMABuffer) {
2116 printk(KERN_ERR "atari_floppy_init: cannot get dma buffer\n");
2117 ret = -ENOMEM;
2118 goto err;
2119 }
2120 TrackBuffer = DMABuffer + 512;
2121 PhysDMABuffer = atari_stram_to_phys(DMABuffer);
2122 PhysTrackBuffer = virt_to_phys(TrackBuffer);
2123 BufferDrive = BufferSide = BufferTrack = -1;
2124
2125 for (i = 0; i < FD_MAX_UNITS; i++) {
2126 unit[i].track = -1;
2127 unit[i].flags = 0;
2128 ret = add_disk(unit[i].disk[0]);
2129 if (ret)
2130 goto err_out_dma;
2131 unit[i].registered[0] = true;
2132 }
2133
2134 printk(KERN_INFO "Atari floppy driver: max. %cD, %strack buffering\n",
2135 DriveType == 0 ? 'D' : DriveType == 1 ? 'H' : 'E',
2136 UseTrackbuffer ? "" : "no ");
2137 config_types();
2138
2139 ret = __register_blkdev(FLOPPY_MAJOR, "fd", ataflop_probe);
2140 if (ret) {
2141 printk(KERN_ERR "atari_floppy_init: cannot register block device\n");
2142 atari_floppy_cleanup();
2143 }
2144 return ret;
2145
2146 err_out_dma:
2147 atari_stram_free(DMABuffer);
2148 err:
2149 while (--i >= 0)
2150 atari_cleanup_floppy_disk(&unit[i]);
2151
2152 return ret;
2153 }
2154
2155 #ifndef MODULE
atari_floppy_setup(char * str)2156 static int __init atari_floppy_setup(char *str)
2157 {
2158 int ints[3 + FD_MAX_UNITS];
2159 int i;
2160
2161 if (!MACH_IS_ATARI)
2162 return 0;
2163
2164 str = get_options(str, 3 + FD_MAX_UNITS, ints);
2165
2166 if (ints[0] < 1) {
2167 printk(KERN_ERR "ataflop_setup: no arguments!\n" );
2168 return 0;
2169 }
2170 else if (ints[0] > 2+FD_MAX_UNITS) {
2171 printk(KERN_ERR "ataflop_setup: too many arguments\n" );
2172 }
2173
2174 if (ints[1] < 0 || ints[1] > 2)
2175 printk(KERN_ERR "ataflop_setup: bad drive type\n" );
2176 else
2177 DriveType = ints[1];
2178
2179 if (ints[0] >= 2)
2180 UseTrackbuffer = (ints[2] > 0);
2181
2182 for( i = 3; i <= ints[0] && i-3 < FD_MAX_UNITS; ++i ) {
2183 if (ints[i] != 2 && ints[i] != 3 && ints[i] != 6 && ints[i] != 12)
2184 printk(KERN_ERR "ataflop_setup: bad steprate\n" );
2185 else
2186 UserSteprate[i-3] = ints[i];
2187 }
2188 return 1;
2189 }
2190
2191 __setup("floppy=", atari_floppy_setup);
2192 #endif
2193
atari_floppy_exit(void)2194 static void __exit atari_floppy_exit(void)
2195 {
2196 unregister_blkdev(FLOPPY_MAJOR, "fd");
2197 atari_floppy_cleanup();
2198 }
2199
2200 module_init(atari_floppy_init)
2201 module_exit(atari_floppy_exit)
2202
2203 MODULE_DESCRIPTION("Atari floppy driver");
2204 MODULE_LICENSE("GPL");
2205