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
84static DEFINE_MUTEX(ataflop_mutex);
85static 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
162struct 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 */
169static 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
213static 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
223static int DriveType = TYPE_HD;
224
225static DEFINE_SPINLOCK(ataflop_lock);
226
227/* Array for translating minors into disk formats */
228static 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 */
278static 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 */
286static struct atari_disk_type default_params[FD_MAX_UNITS];
287
288/* current info on each unit */
289static 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
346static int MaxSectors[] = {
347 11, 22, 44
348};
349static int BufferSize[] = {
350 15*512, 30*512, 60*512
351};
352
353#define BUFFER_SIZE (BufferSize[DriveType])
354
355unsigned char *DMABuffer; /* buffer for writes */
356static unsigned long PhysDMABuffer; /* physical address */
357
358static int UseTrackbuffer = -1; /* Do track buffering? */
359module_param(UseTrackbuffer, int, 0);
360
361unsigned char *TrackBuffer; /* buffer for reads */
362static unsigned long PhysTrackBuffer; /* physical address */
363static int BufferDrive, BufferSide, BufferTrack;
364static 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 */
375static int SelectedDrive = 0;
376static int ReqCmd, ReqBlock;
377static int ReqSide, ReqTrack, ReqSector, ReqCnt;
378static int HeadSettleFlag = 0;
379static unsigned char *ReqData, *ReqBuffer;
380static int MotorOn = 0, MotorOffTrys;
381static int IsFormatting = 0, FormatError;
382
383static int UserSteprate[FD_MAX_UNITS] = { -1, -1 };
384module_param_array(UserSteprate, int, NULL, 0);
385
386static DECLARE_COMPLETION(format_wait);
387
388static 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 */
406static int Probing = 0;
407
408/* This flag is set when a dummy seek is necessary to make the WP
409 * status bit accessible.
410 */
411static 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
422static void fd_select_side( int side );
423static void fd_select_drive( int drive );
424static void fd_deselect( void );
425static void fd_motor_off_timer(struct timer_list *unused);
426static void check_change(struct timer_list *unused);
427static irqreturn_t floppy_irq (int irq, void *dummy);
428static void fd_error( void );
429static int do_format(int drive, int type, struct atari_format_descr *desc);
430static void do_fd_action( int drive );
431static void fd_calibrate( void );
432static void fd_calibrate_done( int status );
433static void fd_seek( void );
434static void fd_seek_done( int status );
435static void fd_rwsec( void );
436static void fd_readtrack_check(struct timer_list *unused);
437static void fd_rwsec_done( int status );
438static void fd_rwsec_done1(int status);
439static void fd_writetrack( void );
440static void fd_writetrack_done( int status );
441static void fd_times_out(struct timer_list *unused);
442static void finish_fdc( void );
443static void finish_fdc_done( int dummy );
444static void setup_req_params( int drive );
445static int fd_locked_ioctl(struct block_device *bdev, blk_mode_t mode,
446 unsigned int cmd, unsigned long param);
447static void fd_probe( int drive );
448static int fd_test_drive_present( int drive );
449static void config_types( void );
450static int floppy_open(struct gendisk *disk, blk_mode_t mode);
451static void floppy_release(struct gendisk *disk);
452
453/************************* End of Prototypes **************************/
454
455static DEFINE_TIMER(motor_off_timer, fd_motor_off_timer);
456static DEFINE_TIMER(readtrack_timer, fd_readtrack_check);
457static DEFINE_TIMER(timeout_timer, fd_times_out);
458static DEFINE_TIMER(fd_timer, check_change);
459
460static 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(rq: fd_request, error: err,
467 nr_bytes: blk_rq_cur_bytes(rq: fd_request))) {
468 DPRINT(("calling __blk_mq_end_request()\n"));
469 __blk_mq_end_request(rq: fd_request, error: 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(rq: fd_request, kick_requeue_list: true);
475 fd_request = NULL;
476 }
477}
478
479static inline void start_motor_off_timer(void)
480{
481 mod_timer(timer: &motor_off_timer, expires: jiffies + FD_MOTOR_OFF_DELAY);
482 MotorOffTrys = 0;
483}
484
485static inline void start_check_change_timer( void )
486{
487 mod_timer(timer: &fd_timer, expires: jiffies + CHECK_CHANGE_DELAY);
488}
489
490static inline void start_timeout(void)
491{
492 mod_timer(timer: &timeout_timer, expires: jiffies + FLOPPY_TIMEOUT);
493}
494
495static inline void stop_timeout(void)
496{
497 del_timer(timer: &timeout_timer);
498}
499
500/* Select the side to use. */
501
502static 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
521static 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
552static 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
574static 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(timer: &motor_off_timer,
602 expires: 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
610static 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 (nr: drive, addr: &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
648static inline void set_head_settle_flag(void)
649{
650 HeadSettleFlag = FDCCMDADD_E;
651}
652
653static inline int get_head_settle_flag(void)
654{
655 int tmp = HeadSettleFlag;
656 HeadSettleFlag = 0;
657 return( tmp );
658}
659
660static 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
671static void (*FloppyIRQHandler)( int status ) = NULL;
672
673static 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
697static 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( drive: 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
743static 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( 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;
818out:
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
834static 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), to: ReqData );
843 if (++ReqCnt < blk_rq_cur_sectors(rq: 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( from: 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
879static void fd_calibrate( void )
880{
881 if (SUD.track >= 0) {
882 fd_calibrate_done( status: 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
900static 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
923static void fd_seek( void )
924{
925 if (SUD.track == ReqTrack << SUDT->stretch) {
926 fd_seek_done( status: 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
948static 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
978static int MultReadInProgress = 0;
979
980
981static 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(address: ReqData);
991 }
992 else {
993 copy_buffer( from: ReqData, to: 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( 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(timer: &readtrack_timer,
1070 /* 1 rot. + 5 rot.s if motor was off */
1071 expires: jiffies + HZ/5 + (old_motoron ? 0 : HZ));
1072 }
1073 start_timeout();
1074}
1075
1076
1077static 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(status: 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(timer: &readtrack_timer, expires: jiffies + HZ/5/10);
1131 }
1132}
1133
1134
1135static void fd_rwsec_done( int status )
1136{
1137 DPRINT(("fd_rwsec_done()\n"));
1138
1139 if (read_track) {
1140 del_timer(timer: &readtrack_timer);
1141 if (!MultReadInProgress)
1142 return;
1143 MultReadInProgress = 0;
1144 }
1145 fd_rwsec_done1(status);
1146}
1147
1148static 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(disk: 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(disk: 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( drive: 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(address: addr), 512, 0 );
1237 if (!ATARIHW_PRESENT( EXTD_DMA ))
1238 copy_buffer (from: addr, to: 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), to: ReqData);
1245 }
1246 }
1247
1248 if (++ReqCnt < blk_rq_cur_sectors(rq: fd_request)) {
1249 /* read next sector */
1250 setup_req_params( SelectedDrive );
1251 do_fd_action( drive: 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
1266static 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( 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
1325static 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
1348static 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( 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
1376static void finish_fdc( void )
1377{
1378 if (!NeedSeek || !stdma_is_locked_by(floppy_irq)) {
1379 finish_fdc_done( dummy: 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
1395static 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(timer: &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(timer: &fd_timer, expires: 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
1435static 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
1458static 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(nr: drive, addr: &fake_change);
1469 clear_bit(nr: drive, addr: &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
1484static 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
1503static 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(lock: &ataflop_lock);
1515 if (fd_request) {
1516 spin_unlock_irq(lock: &ataflop_lock);
1517 return BLK_STS_DEV_RESOURCE;
1518 }
1519 if (!stdma_try_lock(floppy_irq, NULL)) {
1520 spin_unlock_irq(lock: &ataflop_lock);
1521 return BLK_STS_RESOURCE;
1522 }
1523 fd_request = bd->rq;
1524 unit[drive].error_count = 0;
1525 blk_mq_start_request(rq: 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(disk: 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(disk: bd->rq->q->disk, UDT->blocks);
1564 UD.autoprobe = 0;
1565 }
1566
1567 /* stop deselect timer */
1568 del_timer( timer: &motor_off_timer );
1569
1570 ReqCnt = 0;
1571 ReqCmd = rq_data_dir(fd_request);
1572 ReqBlock = blk_rq_pos(rq: fd_request);
1573 ReqBuffer = bio_data(bio: fd_request->bio);
1574 setup_req_params( drive );
1575 do_fd_action( drive );
1576
1577 atari_enable_irq( IRQ_MFP_FDC );
1578
1579out:
1580 spin_unlock_irq(lock: &ataflop_lock);
1581 return BLK_STS_OK;
1582}
1583
1584static 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(to: argp, from: &getprm, n: 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(to: &setprm, from: argp, n: 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, clearing: 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(to: &fmt_desc, from: argp, n: sizeof(fmt_desc)))
1750 return -EFAULT;
1751 return do_format(drive, type, desc: &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(nr: drive, addr: &fake_change);
1763 if (disk_check_media_change(disk)) {
1764 bdev_mark_dead(bdev: disk->part0, surprise: true);
1765 floppy_revalidate(disk);
1766 }
1767 return 0;
1768 default:
1769 return -EINVAL;
1770 }
1771}
1772
1773static int fd_ioctl(struct block_device *bdev, blk_mode_t mode,
1774 unsigned int cmd, unsigned long arg)
1775{
1776 int ret;
1777
1778 mutex_lock(&ataflop_mutex);
1779 ret = fd_locked_ioctl(bdev, mode, cmd, param: arg);
1780 mutex_unlock(lock: &ataflop_mutex);
1781
1782 return ret;
1783}
1784
1785/* Initialize the 'unit' variable for drive 'drive' */
1786
1787static void __init fd_probe( int drive )
1788{
1789 UD.connected = 0;
1790 UDT = NULL;
1791
1792 if (!fd_test_drive_present( drive ))
1793 return;
1794
1795 UD.connected = 1;
1796 UD.track = 0;
1797 switch( UserSteprate[drive] ) {
1798 case 2:
1799 UD.steprate = FDCSTEP_2;
1800 break;
1801 case 3:
1802 UD.steprate = FDCSTEP_3;
1803 break;
1804 case 6:
1805 UD.steprate = FDCSTEP_6;
1806 break;
1807 case 12:
1808 UD.steprate = FDCSTEP_12;
1809 break;
1810 default: /* should be -1 for "not set by user" */
1811 if (ATARIHW_PRESENT( FDCSPEED ) || MACH_IS_MEDUSA)
1812 UD.steprate = FDCSTEP_3;
1813 else
1814 UD.steprate = FDCSTEP_6;
1815 break;
1816 }
1817 MotorOn = 1; /* from probe restore operation! */
1818}
1819
1820
1821/* This function tests the physical presence of a floppy drive (not
1822 * whether a disk is inserted). This is done by issuing a restore
1823 * command, waiting max. 2 seconds (that should be enough to move the
1824 * head across the whole disk) and looking at the state of the "TR00"
1825 * signal. This should now be raised if there is a drive connected
1826 * (and there is no hardware failure :-) Otherwise, the drive is
1827 * declared absent.
1828 */
1829
1830static int __init fd_test_drive_present( int drive )
1831{
1832 unsigned long timeout;
1833 unsigned char status;
1834 int ok;
1835
1836 if (drive >= (MACH_IS_FALCON ? 1 : 2)) return( 0 );
1837 fd_select_drive( drive );
1838
1839 /* disable interrupt temporarily */
1840 atari_turnoff_irq( IRQ_MFP_FDC );
1841 FDC_WRITE (FDCREG_TRACK, 0xff00);
1842 FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | FDCCMDADD_H | FDCSTEP_6 );
1843
1844 timeout = jiffies + 2*HZ+HZ/2;
1845 while (time_before(jiffies, timeout))
1846 if (!(st_mfp.par_dt_reg & 0x20))
1847 break;
1848
1849 status = FDC_READ( FDCREG_STATUS );
1850 ok = (status & FDCSTAT_TR00) != 0;
1851
1852 /* force interrupt to abort restore operation (FDC would try
1853 * about 50 seconds!) */
1854 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1855 udelay(500);
1856 status = FDC_READ( FDCREG_STATUS );
1857 udelay(20);
1858
1859 if (ok) {
1860 /* dummy seek command to make WP bit accessible */
1861 FDC_WRITE( FDCREG_DATA, 0 );
1862 FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK );
1863 while( st_mfp.par_dt_reg & 0x20 )
1864 ;
1865 status = FDC_READ( FDCREG_STATUS );
1866 }
1867
1868 atari_turnon_irq( IRQ_MFP_FDC );
1869 return( ok );
1870}
1871
1872
1873/* Look how many and which kind of drives are connected. If there are
1874 * floppies, additionally start the disk-change and motor-off timers.
1875 */
1876
1877static void __init config_types( void )
1878{
1879 int drive, cnt = 0;
1880
1881 /* for probing drives, set the FDC speed to 8 MHz */
1882 if (ATARIHW_PRESENT(FDCSPEED))
1883 dma_wd.fdc_speed = 0;
1884
1885 printk(KERN_INFO "Probing floppy drive(s):\n");
1886 for( drive = 0; drive < FD_MAX_UNITS; drive++ ) {
1887 fd_probe( drive );
1888 if (UD.connected) {
1889 printk(KERN_INFO "fd%d\n", drive);
1890 ++cnt;
1891 }
1892 }
1893
1894 if (FDC_READ( FDCREG_STATUS ) & FDCSTAT_BUSY) {
1895 /* If FDC is still busy from probing, give it another FORCI
1896 * command to abort the operation. If this isn't done, the FDC
1897 * will interrupt later and its IRQ line stays low, because
1898 * the status register isn't read. And this will block any
1899 * interrupts on this IRQ line :-(
1900 */
1901 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1902 udelay(500);
1903 FDC_READ( FDCREG_STATUS );
1904 udelay(20);
1905 }
1906
1907 if (cnt > 0) {
1908 start_motor_off_timer();
1909 if (cnt == 1) fd_select_drive( drive: 0 );
1910 start_check_change_timer();
1911 }
1912}
1913
1914/*
1915 * floppy_open check for aliasing (/dev/fd0 can be the same as
1916 * /dev/PS0 etc), and disallows simultaneous access to the same
1917 * drive with different device numbers.
1918 */
1919
1920static int floppy_open(struct gendisk *disk, blk_mode_t mode)
1921{
1922 struct atari_floppy_struct *p = disk->private_data;
1923 int type = disk->first_minor >> 2;
1924
1925 DPRINT(("fd_open: type=%d\n",type));
1926 if (p->ref && p->type != type)
1927 return -EBUSY;
1928
1929 if (p->ref == -1 || (p->ref && mode & BLK_OPEN_EXCL))
1930 return -EBUSY;
1931 if (mode & BLK_OPEN_EXCL)
1932 p->ref = -1;
1933 else
1934 p->ref++;
1935
1936 p->type = type;
1937
1938 if (mode & BLK_OPEN_NDELAY)
1939 return 0;
1940
1941 if (mode & (BLK_OPEN_READ | BLK_OPEN_WRITE)) {
1942 if (disk_check_media_change(disk))
1943 floppy_revalidate(disk);
1944 if (mode & BLK_OPEN_WRITE) {
1945 if (p->wpstat) {
1946 if (p->ref < 0)
1947 p->ref = 0;
1948 else
1949 p->ref--;
1950 return -EROFS;
1951 }
1952 }
1953 }
1954 return 0;
1955}
1956
1957static int floppy_unlocked_open(struct gendisk *disk, blk_mode_t mode)
1958{
1959 int ret;
1960
1961 mutex_lock(&ataflop_mutex);
1962 ret = floppy_open(disk, mode);
1963 mutex_unlock(lock: &ataflop_mutex);
1964
1965 return ret;
1966}
1967
1968static void floppy_release(struct gendisk *disk)
1969{
1970 struct atari_floppy_struct *p = disk->private_data;
1971 mutex_lock(&ataflop_mutex);
1972 if (p->ref < 0)
1973 p->ref = 0;
1974 else if (!p->ref--) {
1975 printk(KERN_ERR "floppy_release with fd_ref == 0");
1976 p->ref = 0;
1977 }
1978 mutex_unlock(lock: &ataflop_mutex);
1979}
1980
1981static const struct block_device_operations floppy_fops = {
1982 .owner = THIS_MODULE,
1983 .open = floppy_unlocked_open,
1984 .release = floppy_release,
1985 .ioctl = fd_ioctl,
1986 .check_events = floppy_check_events,
1987};
1988
1989static const struct blk_mq_ops ataflop_mq_ops = {
1990 .queue_rq = ataflop_queue_rq,
1991};
1992
1993static int ataflop_alloc_disk(unsigned int drive, unsigned int type)
1994{
1995 struct gendisk *disk;
1996
1997 disk = blk_mq_alloc_disk(&unit[drive].tag_set, NULL);
1998 if (IS_ERR(ptr: disk))
1999 return PTR_ERR(ptr: disk);
2000
2001 disk->major = FLOPPY_MAJOR;
2002 disk->first_minor = drive + (type << 2);
2003 disk->minors = 1;
2004 sprintf(buf: disk->disk_name, fmt: "fd%d", drive);
2005 disk->fops = &floppy_fops;
2006 disk->flags |= GENHD_FL_NO_PART;
2007 disk->events = DISK_EVENT_MEDIA_CHANGE;
2008 disk->private_data = &unit[drive];
2009 set_capacity(disk, MAX_DISK_SIZE * 2);
2010
2011 unit[drive].disk[type] = disk;
2012 return 0;
2013}
2014
2015static void ataflop_probe(dev_t dev)
2016{
2017 int drive = MINOR(dev) & 3;
2018 int type = MINOR(dev) >> 2;
2019
2020 if (type)
2021 type--;
2022
2023 if (drive >= FD_MAX_UNITS || type >= NUM_DISK_MINORS)
2024 return;
2025 if (unit[drive].disk[type])
2026 return;
2027 if (ataflop_alloc_disk(drive, type))
2028 return;
2029 if (add_disk(disk: unit[drive].disk[type]))
2030 goto cleanup_disk;
2031 unit[drive].registered[type] = true;
2032 return;
2033
2034cleanup_disk:
2035 put_disk(disk: unit[drive].disk[type]);
2036 unit[drive].disk[type] = NULL;
2037}
2038
2039static void atari_floppy_cleanup(void)
2040{
2041 int i;
2042 int type;
2043
2044 for (i = 0; i < FD_MAX_UNITS; i++) {
2045 for (type = 0; type < NUM_DISK_MINORS; type++) {
2046 if (!unit[i].disk[type])
2047 continue;
2048 del_gendisk(gp: unit[i].disk[type]);
2049 put_disk(disk: unit[i].disk[type]);
2050 }
2051 blk_mq_free_tag_set(set: &unit[i].tag_set);
2052 }
2053
2054 del_timer_sync(timer: &fd_timer);
2055 atari_stram_free(DMABuffer);
2056}
2057
2058static void atari_cleanup_floppy_disk(struct atari_floppy_struct *fs)
2059{
2060 int type;
2061
2062 for (type = 0; type < NUM_DISK_MINORS; type++) {
2063 if (!fs->disk[type])
2064 continue;
2065 if (fs->registered[type])
2066 del_gendisk(gp: fs->disk[type]);
2067 put_disk(disk: fs->disk[type]);
2068 }
2069 blk_mq_free_tag_set(set: &fs->tag_set);
2070}
2071
2072static int __init atari_floppy_init (void)
2073{
2074 int i;
2075 int ret;
2076
2077 if (!MACH_IS_ATARI)
2078 /* Amiga, Mac, ... don't have Atari-compatible floppy :-) */
2079 return -ENODEV;
2080
2081 for (i = 0; i < FD_MAX_UNITS; i++) {
2082 memset(&unit[i].tag_set, 0, sizeof(unit[i].tag_set));
2083 unit[i].tag_set.ops = &ataflop_mq_ops;
2084 unit[i].tag_set.nr_hw_queues = 1;
2085 unit[i].tag_set.nr_maps = 1;
2086 unit[i].tag_set.queue_depth = 2;
2087 unit[i].tag_set.numa_node = NUMA_NO_NODE;
2088 unit[i].tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
2089 ret = blk_mq_alloc_tag_set(set: &unit[i].tag_set);
2090 if (ret)
2091 goto err;
2092
2093 ret = ataflop_alloc_disk(drive: i, type: 0);
2094 if (ret) {
2095 blk_mq_free_tag_set(set: &unit[i].tag_set);
2096 goto err;
2097 }
2098 }
2099
2100 if (UseTrackbuffer < 0)
2101 /* not set by user -> use default: for now, we turn
2102 track buffering off for all Medusas, though it
2103 could be used with ones that have a counter
2104 card. But the test is too hard :-( */
2105 UseTrackbuffer = !MACH_IS_MEDUSA;
2106
2107 /* initialize variables */
2108 SelectedDrive = -1;
2109 BufferDrive = -1;
2110
2111 DMABuffer = atari_stram_alloc(BUFFER_SIZE+512, "ataflop");
2112 if (!DMABuffer) {
2113 printk(KERN_ERR "atari_floppy_init: cannot get dma buffer\n");
2114 ret = -ENOMEM;
2115 goto err;
2116 }
2117 TrackBuffer = DMABuffer + 512;
2118 PhysDMABuffer = atari_stram_to_phys(DMABuffer);
2119 PhysTrackBuffer = virt_to_phys(address: TrackBuffer);
2120 BufferDrive = BufferSide = BufferTrack = -1;
2121
2122 for (i = 0; i < FD_MAX_UNITS; i++) {
2123 unit[i].track = -1;
2124 unit[i].flags = 0;
2125 ret = add_disk(disk: unit[i].disk[0]);
2126 if (ret)
2127 goto err_out_dma;
2128 unit[i].registered[0] = true;
2129 }
2130
2131 printk(KERN_INFO "Atari floppy driver: max. %cD, %strack buffering\n",
2132 DriveType == 0 ? 'D' : DriveType == 1 ? 'H' : 'E',
2133 UseTrackbuffer ? "" : "no ");
2134 config_types();
2135
2136 ret = __register_blkdev(FLOPPY_MAJOR, name: "fd", probe: ataflop_probe);
2137 if (ret) {
2138 printk(KERN_ERR "atari_floppy_init: cannot register block device\n");
2139 atari_floppy_cleanup();
2140 }
2141 return ret;
2142
2143err_out_dma:
2144 atari_stram_free(DMABuffer);
2145err:
2146 while (--i >= 0)
2147 atari_cleanup_floppy_disk(fs: &unit[i]);
2148
2149 return ret;
2150}
2151
2152#ifndef MODULE
2153static int __init atari_floppy_setup(char *str)
2154{
2155 int ints[3 + FD_MAX_UNITS];
2156 int i;
2157
2158 if (!MACH_IS_ATARI)
2159 return 0;
2160
2161 str = get_options(str, nints: 3 + FD_MAX_UNITS, ints);
2162
2163 if (ints[0] < 1) {
2164 printk(KERN_ERR "ataflop_setup: no arguments!\n" );
2165 return 0;
2166 }
2167 else if (ints[0] > 2+FD_MAX_UNITS) {
2168 printk(KERN_ERR "ataflop_setup: too many arguments\n" );
2169 }
2170
2171 if (ints[1] < 0 || ints[1] > 2)
2172 printk(KERN_ERR "ataflop_setup: bad drive type\n" );
2173 else
2174 DriveType = ints[1];
2175
2176 if (ints[0] >= 2)
2177 UseTrackbuffer = (ints[2] > 0);
2178
2179 for( i = 3; i <= ints[0] && i-3 < FD_MAX_UNITS; ++i ) {
2180 if (ints[i] != 2 && ints[i] != 3 && ints[i] != 6 && ints[i] != 12)
2181 printk(KERN_ERR "ataflop_setup: bad steprate\n" );
2182 else
2183 UserSteprate[i-3] = ints[i];
2184 }
2185 return 1;
2186}
2187
2188__setup("floppy=", atari_floppy_setup);
2189#endif
2190
2191static void __exit atari_floppy_exit(void)
2192{
2193 unregister_blkdev(FLOPPY_MAJOR, name: "fd");
2194 atari_floppy_cleanup();
2195}
2196
2197module_init(atari_floppy_init)
2198module_exit(atari_floppy_exit)
2199
2200MODULE_LICENSE("GPL");
2201

source code of linux/drivers/block/ataflop.c