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drbd: Fix fall-through warnings for Clang
[linux-2.6-block.git] / drivers / block / ataflop.c
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09c434b8 1// SPDX-License-Identifier: GPL-2.0-only
1da177e4
LT		 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>
6ec3938c 70#include <linux/blk-mq.h>
2a48fc0a 71#include <linux/mutex.h>
7b8a3d22
AB		 72#include <linux/completion.h>
73#include <linux/wait.h>
1da177e4 74
1da177e4
LT		 75#include <asm/atariints.h>
76#include <asm/atari_stdma.h>
77#include <asm/atari_stram.h>
78
79#define FD_MAX_UNITS 2
80
81#undef DEBUG
82
2a48fc0a 83static DEFINE_MUTEX(ataflop_mutex);
a336ca6f 84static struct request *fd_request;
1da177e4 85
3e6b8c3c
OS		 86/*
87 * WD1772 stuff
88 */
89
90/* register codes */
91
92#define FDCSELREG_STP (0x80) /* command/status register */
93#define FDCSELREG_TRA (0x82) /* track register */
94#define FDCSELREG_SEC (0x84) /* sector register */
95#define FDCSELREG_DTA (0x86) /* data register */
96
97/* register names for FDC_READ/WRITE macros */
98
99#define FDCREG_CMD 0
100#define FDCREG_STATUS 0
101#define FDCREG_TRACK 2
102#define FDCREG_SECTOR 4
103#define FDCREG_DATA 6
104
105/* command opcodes */
106
107#define FDCCMD_RESTORE (0x00) /* - */
108#define FDCCMD_SEEK (0x10) /* | */
109#define FDCCMD_STEP (0x20) /* | TYP 1 Commands */
110#define FDCCMD_STIN (0x40) /* | */
111#define FDCCMD_STOT (0x60) /* - */
112#define FDCCMD_RDSEC (0x80) /* - TYP 2 Commands */
113#define FDCCMD_WRSEC (0xa0) /* - " */
114#define FDCCMD_RDADR (0xc0) /* - */
115#define FDCCMD_RDTRA (0xe0) /* | TYP 3 Commands */
116#define FDCCMD_WRTRA (0xf0) /* - */
117#define FDCCMD_FORCI (0xd0) /* - TYP 4 Command */
118
119/* command modifier bits */
120
121#define FDCCMDADD_SR6 (0x00) /* step rate settings */
122#define FDCCMDADD_SR12 (0x01)
123#define FDCCMDADD_SR2 (0x02)
124#define FDCCMDADD_SR3 (0x03)
125#define FDCCMDADD_V (0x04) /* verify */
126#define FDCCMDADD_H (0x08) /* wait for spin-up */
127#define FDCCMDADD_U (0x10) /* update track register */
128#define FDCCMDADD_M (0x10) /* multiple sector access */
129#define FDCCMDADD_E (0x04) /* head settling flag */
130#define FDCCMDADD_P (0x02) /* precompensation off */
131#define FDCCMDADD_A0 (0x01) /* DAM flag */
132
133/* status register bits */
134
135#define FDCSTAT_MOTORON (0x80) /* motor on */
136#define FDCSTAT_WPROT (0x40) /* write protected (FDCCMD_WR*) */
137#define FDCSTAT_SPINUP (0x20) /* motor speed stable (Type I) */
138#define FDCSTAT_DELDAM (0x20) /* sector has deleted DAM (Type II+III) */
139#define FDCSTAT_RECNF (0x10) /* record not found */
140#define FDCSTAT_CRC (0x08) /* CRC error */
141#define FDCSTAT_TR00 (0x04) /* Track 00 flag (Type I) */
142#define FDCSTAT_LOST (0x04) /* Lost Data (Type II+III) */
143#define FDCSTAT_IDX (0x02) /* Index status (Type I) */
144#define FDCSTAT_DRQ (0x02) /* DRQ status (Type II+III) */
145#define FDCSTAT_BUSY (0x01) /* FDC is busy */
146
147
148/* PSG Port A Bit Nr 0 .. Side Sel .. 0 -> Side 1 1 -> Side 2 */
149#define DSKSIDE (0x01)
150
151#define DSKDRVNONE (0x06)
152#define DSKDRV0 (0x02)
153#define DSKDRV1 (0x04)
154
155/* step rates */
156#define FDCSTEP_6 0x00
157#define FDCSTEP_12 0x01
158#define FDCSTEP_2 0x02
159#define FDCSTEP_3 0x03
160
161struct atari_format_descr {
162 int track; /* to be formatted */
163 int head; /* "" "" */
164 int sect_offset; /* offset of first sector */
165};
166
1da177e4
LT		 167/* Disk types: DD, HD, ED */
168static struct atari_disk_type {
169 const char *name;
170 unsigned spt; /* sectors per track */
171 unsigned blocks; /* total number of blocks */
172 unsigned fdc_speed; /* fdc_speed setting */
173 unsigned stretch; /* track doubling ? */
5ceadd2a 174} atari_disk_type[] = {
1da177e4
LT		 175 { "d360", 9, 720, 0, 0}, /* 0: 360kB diskette */
176 { "D360", 9, 720, 0, 1}, /* 1: 360kb in 720k or 1.2MB drive */
177 { "D720", 9,1440, 0, 0}, /* 2: 720kb in 720k or 1.2MB drive */
178 { "D820", 10,1640, 0, 0}, /* 3: DD disk with 82 tracks/10 sectors */
179/* formats above are probed for type DD */
180#define MAX_TYPE_DD 3
181 { "h1200",15,2400, 3, 0}, /* 4: 1.2MB diskette */
182 { "H1440",18,2880, 3, 0}, /* 5: 1.4 MB diskette (HD) */
183 { "H1640",20,3280, 3, 0}, /* 6: 1.64MB diskette (fat HD) 82 tr 20 sec */
184/* formats above are probed for types DD and HD */
185#define MAX_TYPE_HD 6
186 { "E2880",36,5760, 3, 0}, /* 7: 2.8 MB diskette (ED) */
187 { "E3280",40,6560, 3, 0}, /* 8: 3.2 MB diskette (fat ED) 82 tr 40 sec */
188/* formats above are probed for types DD, HD and ED */
189#define MAX_TYPE_ED 8
190/* types below are never autoprobed */
191 { "H1680",21,3360, 3, 0}, /* 9: 1.68MB diskette (fat HD) 80 tr 21 sec */
192 { "h410",10,820, 0, 1}, /* 10: 410k diskette 41 tr 10 sec, stretch */
193 { "h1476",18,2952, 3, 0}, /* 11: 1.48MB diskette 82 tr 18 sec */
194 { "H1722",21,3444, 3, 0}, /* 12: 1.72MB diskette 82 tr 21 sec */
195 { "h420",10,840, 0, 1}, /* 13: 420k diskette 42 tr 10 sec, stretch */
196 { "H830",10,1660, 0, 0}, /* 14: 820k diskette 83 tr 10 sec */
197 { "h1494",18,2952, 3, 0}, /* 15: 1.49MB diskette 83 tr 18 sec */
198 { "H1743",21,3486, 3, 0}, /* 16: 1.74MB diskette 83 tr 21 sec */
199 { "h880",11,1760, 0, 0}, /* 17: 880k diskette 80 tr 11 sec */
200 { "D1040",13,2080, 0, 0}, /* 18: 1.04MB diskette 80 tr 13 sec */
201 { "D1120",14,2240, 0, 0}, /* 19: 1.12MB diskette 80 tr 14 sec */
202 { "h1600",20,3200, 3, 0}, /* 20: 1.60MB diskette 80 tr 20 sec */
203 { "H1760",22,3520, 3, 0}, /* 21: 1.76MB diskette 80 tr 22 sec */
204 { "H1920",24,3840, 3, 0}, /* 22: 1.92MB diskette 80 tr 24 sec */
205 { "E3200",40,6400, 3, 0}, /* 23: 3.2MB diskette 80 tr 40 sec */
206 { "E3520",44,7040, 3, 0}, /* 24: 3.52MB diskette 80 tr 44 sec */
207 { "E3840",48,7680, 3, 0}, /* 25: 3.84MB diskette 80 tr 48 sec */
208 { "H1840",23,3680, 3, 0}, /* 26: 1.84MB diskette 80 tr 23 sec */
209 { "D800",10,1600, 0, 0}, /* 27: 800k diskette 80 tr 10 sec */
210};
211
212static int StartDiskType[] = {
213 MAX_TYPE_DD,
214 MAX_TYPE_HD,
215 MAX_TYPE_ED
216};
217
218#define TYPE_DD 0
219#define TYPE_HD 1
220#define TYPE_ED 2
221
222static int DriveType = TYPE_HD;
223
224static DEFINE_SPINLOCK(ataflop_lock);
225
226/* Array for translating minors into disk formats */
227static struct {
228 int index;
229 unsigned drive_types;
230} minor2disktype[] = {
231 { 0, TYPE_DD }, /* 1: d360 */
232 { 4, TYPE_HD }, /* 2: h1200 */
233 { 1, TYPE_DD }, /* 3: D360 */
234 { 2, TYPE_DD }, /* 4: D720 */
235 { 1, TYPE_DD }, /* 5: h360 = D360 */
236 { 2, TYPE_DD }, /* 6: h720 = D720 */
237 { 5, TYPE_HD }, /* 7: H1440 */
238 { 7, TYPE_ED }, /* 8: E2880 */
239/* some PC formats :-) */
240 { 8, TYPE_ED }, /* 9: E3280 <- was "CompaQ" == E2880 for PC */
241 { 5, TYPE_HD }, /* 10: h1440 = H1440 */
242 { 9, TYPE_HD }, /* 11: H1680 */
243 { 10, TYPE_DD }, /* 12: h410 */
244 { 3, TYPE_DD }, /* 13: H820 <- == D820, 82x10 */
245 { 11, TYPE_HD }, /* 14: h1476 */
246 { 12, TYPE_HD }, /* 15: H1722 */
247 { 13, TYPE_DD }, /* 16: h420 */
248 { 14, TYPE_DD }, /* 17: H830 */
249 { 15, TYPE_HD }, /* 18: h1494 */
250 { 16, TYPE_HD }, /* 19: H1743 */
251 { 17, TYPE_DD }, /* 20: h880 */
252 { 18, TYPE_DD }, /* 21: D1040 */
253 { 19, TYPE_DD }, /* 22: D1120 */
254 { 20, TYPE_HD }, /* 23: h1600 */
255 { 21, TYPE_HD }, /* 24: H1760 */
256 { 22, TYPE_HD }, /* 25: H1920 */
257 { 23, TYPE_ED }, /* 26: E3200 */
258 { 24, TYPE_ED }, /* 27: E3520 */
259 { 25, TYPE_ED }, /* 28: E3840 */
260 { 26, TYPE_HD }, /* 29: H1840 */
261 { 27, TYPE_DD }, /* 30: D800 */
262 { 6, TYPE_HD }, /* 31: H1640 <- was H1600 == h1600 for PC */
263};
264
945f390f 265#define NUM_DISK_MINORS ARRAY_SIZE(minor2disktype)
1da177e4
LT		 266
267/*
268 * Maximum disk size (in kilobytes). This default is used whenever the
269 * current disk size is unknown.
270 */
271#define MAX_DISK_SIZE 3280
272
273/*
274 * MSch: User-provided type information. 'drive' points to
275 * the respective entry of this array. Set by FDSETPRM ioctls.
276 */
277static struct atari_disk_type user_params[FD_MAX_UNITS];
278
279/*
280 * User-provided permanent type information. 'drive' points to
281 * the respective entry of this array. Set by FDDEFPRM ioctls,
282 * restored upon disk change by floppy_revalidate() if valid (as seen by
283 * default_params[].blocks > 0 - a bit in unit[].flags might be used for this?)
284 */
285static struct atari_disk_type default_params[FD_MAX_UNITS];
286
287/* current info on each unit */
288static struct atari_floppy_struct {
289 int connected; /* !=0 : drive is connected */
290 int autoprobe; /* !=0 : do autoprobe */
291
292 struct atari_disk_type *disktype; /* current type of disk */
293
294 int track; /* current head position or -1 if
295 unknown */
296 unsigned int steprate; /* steprate setting */
297 unsigned int wpstat; /* current state of WP signal (for
298 disk change detection) */
299 int flags; /* flags */
bf9c0538 300 struct gendisk *disk[NUM_DISK_MINORS];
1da177e4
LT		 301 int ref;
302 int type;
6ec3938c 303 struct blk_mq_tag_set tag_set;
1da177e4
LT		 304} unit[FD_MAX_UNITS];
305
306#define UD unit[drive]
307#define UDT unit[drive].disktype
308#define SUD unit[SelectedDrive]
309#define SUDT unit[SelectedDrive].disktype
310
311
312#define FDC_READ(reg) ({ \
313 /* unsigned long __flags; */ \
314 unsigned short __val; \
315 /* local_irq_save(__flags); */ \
316 dma_wd.dma_mode_status = 0x80 | (reg); \
317 udelay(25); \
318 __val = dma_wd.fdc_acces_seccount; \
319 MFPDELAY(); \
320 /* local_irq_restore(__flags); */ \
321 __val & 0xff; \
322})
323
324#define FDC_WRITE(reg,val) \
325 do { \
326 /* unsigned long __flags; */ \
327 /* local_irq_save(__flags); */ \
328 dma_wd.dma_mode_status = 0x80 | (reg); \
329 udelay(25); \
330 dma_wd.fdc_acces_seccount = (val); \
331 MFPDELAY(); \
332 /* local_irq_restore(__flags); */ \
333 } while(0)
334
335
336/* Buffering variables:
337 * First, there is a DMA buffer in ST-RAM that is used for floppy DMA
338 * operations. Second, a track buffer is used to cache a whole track
339 * of the disk to save read operations. These are two separate buffers
340 * because that allows write operations without clearing the track buffer.
341 */
342
343static int MaxSectors[] = {
344 11, 22, 44
345};
346static int BufferSize[] = {
347 15*512, 30*512, 60*512
348};
349
350#define BUFFER_SIZE (BufferSize[DriveType])
351
352unsigned char *DMABuffer; /* buffer for writes */
353static unsigned long PhysDMABuffer; /* physical address */
354
355static int UseTrackbuffer = -1; /* Do track buffering? */
8d3b33f6 356module_param(UseTrackbuffer, int, 0);
1da177e4
LT		 357
358unsigned char *TrackBuffer; /* buffer for reads */
359static unsigned long PhysTrackBuffer; /* physical address */
360static int BufferDrive, BufferSide, BufferTrack;
361static int read_track; /* non-zero if we are reading whole tracks */
362
363#define SECTOR_BUFFER(sec) (TrackBuffer + ((sec)-1)*512)
364#define IS_BUFFERED(drive,side,track) \
365 (BufferDrive == (drive) && BufferSide == (side) && BufferTrack == (track))
366
367/*
368 * These are global variables, as that's the easiest way to give
369 * information to interrupts. They are the data used for the current
370 * request.
371 */
372static int SelectedDrive = 0;
373static int ReqCmd, ReqBlock;
374static int ReqSide, ReqTrack, ReqSector, ReqCnt;
375static int HeadSettleFlag = 0;
376static unsigned char *ReqData, *ReqBuffer;
377static int MotorOn = 0, MotorOffTrys;
378static int IsFormatting = 0, FormatError;
379
380static int UserSteprate[FD_MAX_UNITS] = { -1, -1 };
8d3b33f6 381module_param_array(UserSteprate, int, NULL, 0);
1da177e4 382
7b8a3d22 383static DECLARE_COMPLETION(format_wait);
1da177e4
LT		 384
385static unsigned long changed_floppies = 0xff, fake_change = 0;
386#define CHECK_CHANGE_DELAY HZ/2
387
388#define FD_MOTOR_OFF_DELAY (3*HZ)
389#define FD_MOTOR_OFF_MAXTRY (10*20)
390
391#define FLOPPY_TIMEOUT (6*HZ)
392#define RECALIBRATE_ERRORS 4 /* After this many errors the drive
393 * will be recalibrated. */
394#define MAX_ERRORS 8 /* After this many errors the driver
395 * will give up. */
396
397
398/*
399 * The driver is trying to determine the correct media format
400 * while Probing is set. fd_rwsec_done() clears it after a
401 * successful access.
402 */
403static int Probing = 0;
404
405/* This flag is set when a dummy seek is necessary to make the WP
406 * status bit accessible.
407 */
408static int NeedSeek = 0;
409
410
411#ifdef DEBUG
412#define DPRINT(a) printk a
413#else
414#define DPRINT(a)
415#endif
416
417/***************************** Prototypes *****************************/
418
419static void fd_select_side( int side );
420static void fd_select_drive( int drive );
421static void fd_deselect( void );
24ed960a
KC		 422static void fd_motor_off_timer(struct timer_list *unused);
423static void check_change(struct timer_list *unused);
7d12e780 424static irqreturn_t floppy_irq (int irq, void *dummy);
1da177e4
LT		 425static void fd_error( void );
426static int do_format(int drive, int type, struct atari_format_descr *desc);
427static void do_fd_action( int drive );
428static void fd_calibrate( void );
429static void fd_calibrate_done( int status );
430static void fd_seek( void );
431static void fd_seek_done( int status );
432static void fd_rwsec( void );
24ed960a 433static void fd_readtrack_check(struct timer_list *unused);
1da177e4
LT		 434static void fd_rwsec_done( int status );
435static void fd_rwsec_done1(int status);
436static void fd_writetrack( void );
437static void fd_writetrack_done( int status );
24ed960a 438static void fd_times_out(struct timer_list *unused);
1da177e4
LT		 439static void finish_fdc( void );
440static void finish_fdc_done( int dummy );
441static void setup_req_params( int drive );
8a6cfeb6 442static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int
1da177e4
LT		 443 cmd, unsigned long param);
444static void fd_probe( int drive );
445static int fd_test_drive_present( int drive );
446static void config_types( void );
60ad2340 447static int floppy_open(struct block_device *bdev, fmode_t mode);
db2a144b 448static void floppy_release(struct gendisk *disk, fmode_t mode);
1da177e4
LT		 449
450/************************* End of Prototypes **************************/
451
1d27e3e2
KC		 452static DEFINE_TIMER(motor_off_timer, fd_motor_off_timer);
453static DEFINE_TIMER(readtrack_timer, fd_readtrack_check);
454static DEFINE_TIMER(timeout_timer, fd_times_out);
455static DEFINE_TIMER(fd_timer, check_change);
1da177e4 456
2a842aca 457static void fd_end_request_cur(blk_status_t err)
a336ca6f 458{
6ec3938c
OS		 459 if (!blk_update_request(fd_request, err,
460 blk_rq_cur_bytes(fd_request))) {
461 __blk_mq_end_request(fd_request, err);
a336ca6f 462 fd_request = NULL;
6ec3938c 463 }
a336ca6f
TH		 464}
465
1da177e4
LT		 466static inline void start_motor_off_timer(void)
467{
468 mod_timer(&motor_off_timer, jiffies + FD_MOTOR_OFF_DELAY);
469 MotorOffTrys = 0;
470}
471
472static inline void start_check_change_timer( void )
473{
474 mod_timer(&fd_timer, jiffies + CHECK_CHANGE_DELAY);
475}
476
477static inline void start_timeout(void)
478{
479 mod_timer(&timeout_timer, jiffies + FLOPPY_TIMEOUT);
480}
481
482static inline void stop_timeout(void)
483{
484 del_timer(&timeout_timer);
485}
486
487/* Select the side to use. */
488
489static void fd_select_side( int side )
490{
491 unsigned long flags;
492
493 /* protect against various other ints mucking around with the PSG */
494 local_irq_save(flags);
495
496 sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */
497 sound_ym.wd_data = (side == 0) ? sound_ym.rd_data_reg_sel | 0x01 :
498 sound_ym.rd_data_reg_sel & 0xfe;
499
500 local_irq_restore(flags);
501}
502
503
504/* Select a drive, update the FDC's track register and set the correct
505 * clock speed for this disk's type.
506 */
507
508static void fd_select_drive( int drive )
509{
510 unsigned long flags;
511 unsigned char tmp;
512
513 if (drive == SelectedDrive)
514 return;
515
516 /* protect against various other ints mucking around with the PSG */
517 local_irq_save(flags);
518 sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */
519 tmp = sound_ym.rd_data_reg_sel;
520 sound_ym.wd_data = (tmp | DSKDRVNONE) & ~(drive == 0 ? DSKDRV0 : DSKDRV1);
521 atari_dont_touch_floppy_select = 1;
522 local_irq_restore(flags);
523
524 /* restore track register to saved value */
525 FDC_WRITE( FDCREG_TRACK, UD.track );
526 udelay(25);
527
528 /* select 8/16 MHz */
529 if (UDT)
530 if (ATARIHW_PRESENT(FDCSPEED))
531 dma_wd.fdc_speed = UDT->fdc_speed;
532
533 SelectedDrive = drive;
534}
535
536
537/* Deselect both drives. */
538
539static void fd_deselect( void )
540{
541 unsigned long flags;
542
543 /* protect against various other ints mucking around with the PSG */
544 local_irq_save(flags);
545 atari_dont_touch_floppy_select = 0;
546 sound_ym.rd_data_reg_sel=14; /* Select PSG Port A */
547 sound_ym.wd_data = (sound_ym.rd_data_reg_sel |
548 (MACH_IS_FALCON ? 3 : 7)); /* no drives selected */
549 /* On Falcon, the drive B select line is used on the printer port, so
550 * leave it alone... */
551 SelectedDrive = -1;
552 local_irq_restore(flags);
553}
554
555
556/* This timer function deselects the drives when the FDC switched the
557 * motor off. The deselection cannot happen earlier because the FDC
558 * counts the index signals, which arrive only if one drive is selected.
559 */
560
24ed960a 561static void fd_motor_off_timer(struct timer_list *unused)
1da177e4
LT		 562{
563 unsigned char status;
564
565 if (SelectedDrive < 0)
566 /* no drive selected, needn't deselect anyone */
567 return;
568
569 if (stdma_islocked())
570 goto retry;
571
572 status = FDC_READ( FDCREG_STATUS );
573
574 if (!(status & 0x80)) {
575 /* motor already turned off by FDC -> deselect drives */
576 MotorOn = 0;
577 fd_deselect();
578 return;
579 }
580 /* not yet off, try again */
581
582 retry:
583 /* Test again later; if tested too often, it seems there is no disk
584 * in the drive and the FDC will leave the motor on forever (or,
585 * at least until a disk is inserted). So we'll test only twice
586 * per second from then on...
587 */
588 mod_timer(&motor_off_timer,
589 jiffies + (MotorOffTrys++ < FD_MOTOR_OFF_MAXTRY ? HZ/20 : HZ/2));
590}
591
592
593/* This function is repeatedly called to detect disk changes (as good
594 * as possible) and keep track of the current state of the write protection.
595 */
596
24ed960a 597static void check_change(struct timer_list *unused)
1da177e4
LT		 598{
599 static int drive = 0;
600
601 unsigned long flags;
602 unsigned char old_porta;
603 int stat;
604
605 if (++drive > 1 || !UD.connected)
606 drive = 0;
607
608 /* protect against various other ints mucking around with the PSG */
609 local_irq_save(flags);
610
611 if (!stdma_islocked()) {
612 sound_ym.rd_data_reg_sel = 14;
613 old_porta = sound_ym.rd_data_reg_sel;
614 sound_ym.wd_data = (old_porta | DSKDRVNONE) &
615 ~(drive == 0 ? DSKDRV0 : DSKDRV1);
616 stat = !!(FDC_READ( FDCREG_STATUS ) & FDCSTAT_WPROT);
617 sound_ym.wd_data = old_porta;
618
619 if (stat != UD.wpstat) {
620 DPRINT(( "wpstat[%d] = %d\n", drive, stat ));
621 UD.wpstat = stat;
622 set_bit (drive, &changed_floppies);
623 }
624 }
625 local_irq_restore(flags);
626
627 start_check_change_timer();
628}
629
630
631/* Handling of the Head Settling Flag: This flag should be set after each
632 * seek operation, because we don't use seeks with verify.
633 */
634
635static inline void set_head_settle_flag(void)
636{
637 HeadSettleFlag = FDCCMDADD_E;
638}
639
640static inline int get_head_settle_flag(void)
641{
642 int tmp = HeadSettleFlag;
643 HeadSettleFlag = 0;
644 return( tmp );
645}
646
647static inline void copy_buffer(void *from, void *to)
648{
649 ulong *p1 = (ulong *)from, *p2 = (ulong *)to;
650 int cnt;
651
652 for (cnt = 512/4; cnt; cnt--)
653 *p2++ = *p1++;
654}
655
656
657
658
659/* General Interrupt Handling */
660
661static void (*FloppyIRQHandler)( int status ) = NULL;
662
7d12e780 663static irqreturn_t floppy_irq (int irq, void *dummy)
1da177e4
LT		 664{
665 unsigned char status;
666 void (*handler)( int );
667
668 handler = xchg(&FloppyIRQHandler, NULL);
669
670 if (handler) {
671 nop();
672 status = FDC_READ( FDCREG_STATUS );
673 DPRINT(("FDC irq, status = %02x handler = %08lx\n",status,(unsigned long)handler));
674 handler( status );
675 }
676 else {
677 DPRINT(("FDC irq, no handler\n"));
678 }
679 return IRQ_HANDLED;
680}
681
682
683/* Error handling: If some error happened, retry some times, then
684 * recalibrate, then try again, and fail after MAX_ERRORS.
685 */
686
687static void fd_error( void )
688{
689 if (IsFormatting) {
690 IsFormatting = 0;
691 FormatError = 1;
7b8a3d22 692 complete(&format_wait);
1da177e4
LT		 693 return;
694 }
695
a336ca6f 696 if (!fd_request)
1da177e4
LT		 697 return;
698
c8e90782
CH		 699 fd_request->error_count++;
700 if (fd_request->error_count >= MAX_ERRORS) {
1da177e4 701 printk(KERN_ERR "fd%d: too many errors.\n", SelectedDrive );
2a842aca 702 fd_end_request_cur(BLK_STS_IOERR);
1da177e4 703 }
c8e90782 704 else if (fd_request->error_count == RECALIBRATE_ERRORS) {
1da177e4
LT		 705 printk(KERN_WARNING "fd%d: recalibrating\n", SelectedDrive );
706 if (SelectedDrive != -1)
707 SUD.track = -1;
708 }
1da177e4
LT		 709}
710
711
712
713#define SET_IRQ_HANDLER(proc) do { FloppyIRQHandler = (proc); } while(0)
714
715
716/* ---------- Formatting ---------- */
717
718#define FILL(n,val) \
719 do { \
720 memset( p, val, n ); \
721 p += n; \
722 } while(0)
723
724static int do_format(int drive, int type, struct atari_format_descr *desc)
725{
bf9c0538 726 struct request_queue *q;
1da177e4
LT		 727 unsigned char *p;
728 int sect, nsect;
729 unsigned long flags;
6ec3938c 730 int ret;
1da177e4 731
bf9c0538
CH		 732 if (type)
733 type--;
734
735 q = unit[drive].disk[type]->queue;
6ec3938c
OS		 736 blk_mq_freeze_queue(q);
737 blk_mq_quiesce_queue(q);
1da177e4
LT		 738
739 local_irq_save(flags);
1da177e4
LT		 740 stdma_lock(floppy_irq, NULL);
741 atari_turnon_irq( IRQ_MFP_FDC ); /* should be already, just to be sure */
742 local_irq_restore(flags);
743
744 if (type) {
bf9c0538 745 if (type >= NUM_DISK_MINORS ||
1da177e4 746 minor2disktype[type].drive_types > DriveType) {
6ec3938c
OS		 747 ret = -EINVAL;
748 goto out;
1da177e4
LT		 749 }
750 type = minor2disktype[type].index;
5ceadd2a 751 UDT = &atari_disk_type[type];
1da177e4
LT		 752 }
753
754 if (!UDT || desc->track >= UDT->blocks/UDT->spt/2 || desc->head >= 2) {
6ec3938c
OS		 755 ret = -EINVAL;
756 goto out;
1da177e4
LT		 757 }
758
759 nsect = UDT->spt;
760 p = TrackBuffer;
761 /* The track buffer is used for the raw track data, so its
762 contents become invalid! */
763 BufferDrive = -1;
764 /* stop deselect timer */
765 del_timer( &motor_off_timer );
766
767 FILL( 60 * (nsect / 9), 0x4e );
768 for( sect = 0; sect < nsect; ++sect ) {
769 FILL( 12, 0 );
770 FILL( 3, 0xf5 );
771 *p++ = 0xfe;
772 *p++ = desc->track;
773 *p++ = desc->head;
774 *p++ = (nsect + sect - desc->sect_offset) % nsect + 1;
775 *p++ = 2;
776 *p++ = 0xf7;
777 FILL( 22, 0x4e );
778 FILL( 12, 0 );
779 FILL( 3, 0xf5 );
780 *p++ = 0xfb;
781 FILL( 512, 0xe5 );
782 *p++ = 0xf7;
783 FILL( 40, 0x4e );
784 }
785 FILL( TrackBuffer+BUFFER_SIZE-p, 0x4e );
786
787 IsFormatting = 1;
788 FormatError = 0;
789 ReqTrack = desc->track;
790 ReqSide = desc->head;
791 do_fd_action( drive );
792
7b8a3d22 793 wait_for_completion(&format_wait);
1da177e4 794
6ec3938c
OS		 795 ret = FormatError ? -EIO : 0;
796out:
797 blk_mq_unquiesce_queue(q);
798 blk_mq_unfreeze_queue(q);
799 return ret;
1da177e4
LT		 800}
801
802
803/* do_fd_action() is the general procedure for a fd request: All
804 * required parameter settings (drive select, side select, track
805 * position) are checked and set if needed. For each of these
806 * parameters and the actual reading or writing exist two functions:
807 * one that starts the setting (or skips it if possible) and one
808 * callback for the "done" interrupt. Each done func calls the next
809 * set function to propagate the request down to fd_rwsec_done().
810 */
811
812static void do_fd_action( int drive )
813{
814 DPRINT(("do_fd_action\n"));
815
816 if (UseTrackbuffer && !IsFormatting) {
817 repeat:
818 if (IS_BUFFERED( drive, ReqSide, ReqTrack )) {
819 if (ReqCmd == READ) {
820 copy_buffer( SECTOR_BUFFER(ReqSector), ReqData );
a336ca6f 821 if (++ReqCnt < blk_rq_cur_sectors(fd_request)) {
1da177e4
LT		 822 /* read next sector */
823 setup_req_params( drive );
824 goto repeat;
825 }
826 else {
827 /* all sectors finished */
2a842aca 828 fd_end_request_cur(BLK_STS_OK);
1da177e4
LT		 829 return;
830 }
831 }
832 else {
833 /* cmd == WRITE, pay attention to track buffer
834 * consistency! */
835 copy_buffer( ReqData, SECTOR_BUFFER(ReqSector) );
836 }
837 }
838 }
839
840 if (SelectedDrive != drive)
841 fd_select_drive( drive );
842
843 if (UD.track == -1)
844 fd_calibrate();
845 else if (UD.track != ReqTrack << UDT->stretch)
846 fd_seek();
847 else if (IsFormatting)
848 fd_writetrack();
849 else
850 fd_rwsec();
851}
852
853
854/* Seek to track 0 if the current track is unknown */
855
856static void fd_calibrate( void )
857{
858 if (SUD.track >= 0) {
859 fd_calibrate_done( 0 );
860 return;
861 }
862
863 if (ATARIHW_PRESENT(FDCSPEED))
9677d64e 864 dma_wd.fdc_speed = 0; /* always seek with 8 Mhz */
1da177e4
LT		 865 DPRINT(("fd_calibrate\n"));
866 SET_IRQ_HANDLER( fd_calibrate_done );
867 /* we can't verify, since the speed may be incorrect */
868 FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | SUD.steprate );
869
870 NeedSeek = 1;
871 MotorOn = 1;
872 start_timeout();
873 /* wait for IRQ */
874}
875
876
877static void fd_calibrate_done( int status )
878{
879 DPRINT(("fd_calibrate_done()\n"));
880 stop_timeout();
881
882 /* set the correct speed now */
883 if (ATARIHW_PRESENT(FDCSPEED))
884 dma_wd.fdc_speed = SUDT->fdc_speed;
885 if (status & FDCSTAT_RECNF) {
886 printk(KERN_ERR "fd%d: restore failed\n", SelectedDrive );
887 fd_error();
888 }
889 else {
890 SUD.track = 0;
891 fd_seek();
892 }
893}
894
895
896/* Seek the drive to the requested track. The drive must have been
897 * calibrated at some point before this.
898 */
899
900static void fd_seek( void )
901{
902 if (SUD.track == ReqTrack << SUDT->stretch) {
903 fd_seek_done( 0 );
904 return;
905 }
906
907 if (ATARIHW_PRESENT(FDCSPEED)) {
908 dma_wd.fdc_speed = 0; /* always seek witch 8 Mhz */
909 MFPDELAY();
910 }
911
912 DPRINT(("fd_seek() to track %d\n",ReqTrack));
913 FDC_WRITE( FDCREG_DATA, ReqTrack << SUDT->stretch);
914 udelay(25);
915 SET_IRQ_HANDLER( fd_seek_done );
916 FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK | SUD.steprate );
917
918 MotorOn = 1;
919 set_head_settle_flag();
920 start_timeout();
921 /* wait for IRQ */
922}
923
924
925static void fd_seek_done( int status )
926{
927 DPRINT(("fd_seek_done()\n"));
928 stop_timeout();
929
930 /* set the correct speed */
931 if (ATARIHW_PRESENT(FDCSPEED))
932 dma_wd.fdc_speed = SUDT->fdc_speed;
933 if (status & FDCSTAT_RECNF) {
934 printk(KERN_ERR "fd%d: seek error (to track %d)\n",
935 SelectedDrive, ReqTrack );
936 /* we don't know exactly which track we are on now! */
937 SUD.track = -1;
938 fd_error();
939 }
940 else {
941 SUD.track = ReqTrack << SUDT->stretch;
942 NeedSeek = 0;
943 if (IsFormatting)
944 fd_writetrack();
945 else
946 fd_rwsec();
947 }
948}
949
950
951/* This does the actual reading/writing after positioning the head
952 * over the correct track.
953 */
954
955static int MultReadInProgress = 0;
956
957
958static void fd_rwsec( void )
959{
960 unsigned long paddr, flags;
961 unsigned int rwflag, old_motoron;
962 unsigned int track;
963
964 DPRINT(("fd_rwsec(), Sec=%d, Access=%c\n",ReqSector, ReqCmd == WRITE ? 'w' : 'r' ));
965 if (ReqCmd == WRITE) {
966 if (ATARIHW_PRESENT(EXTD_DMA)) {
967 paddr = virt_to_phys(ReqData);
968 }
969 else {
970 copy_buffer( ReqData, DMABuffer );
971 paddr = PhysDMABuffer;
972 }
973 dma_cache_maintenance( paddr, 512, 1 );
974 rwflag = 0x100;
975 }
976 else {
977 if (read_track)
978 paddr = PhysTrackBuffer;
979 else
980 paddr = ATARIHW_PRESENT(EXTD_DMA) ?
981 virt_to_phys(ReqData) : PhysDMABuffer;
982 rwflag = 0;
983 }
984
985 fd_select_side( ReqSide );
986
987 /* Start sector of this operation */
988 FDC_WRITE( FDCREG_SECTOR, read_track ? 1 : ReqSector );
989 MFPDELAY();
990 /* Cheat for track if stretch != 0 */
991 if (SUDT->stretch) {
992 track = FDC_READ( FDCREG_TRACK);
993 MFPDELAY();
994 FDC_WRITE( FDCREG_TRACK, track >> SUDT->stretch);
995 }
996 udelay(25);
997
998 /* Setup DMA */
999 local_irq_save(flags);
1000 dma_wd.dma_lo = (unsigned char)paddr;
1001 MFPDELAY();
1002 paddr >>= 8;
1003 dma_wd.dma_md = (unsigned char)paddr;
1004 MFPDELAY();
1005 paddr >>= 8;
1006 if (ATARIHW_PRESENT(EXTD_DMA))
1007 st_dma_ext_dmahi = (unsigned short)paddr;
1008 else
1009 dma_wd.dma_hi = (unsigned char)paddr;
1010 MFPDELAY();
1011 local_irq_restore(flags);
1012
1013 /* Clear FIFO and switch DMA to correct mode */
1014 dma_wd.dma_mode_status = 0x90 | rwflag;
1015 MFPDELAY();
1016 dma_wd.dma_mode_status = 0x90 | (rwflag ^ 0x100);
1017 MFPDELAY();
1018 dma_wd.dma_mode_status = 0x90 | rwflag;
1019 MFPDELAY();
1020
1021 /* How many sectors for DMA */
1022 dma_wd.fdc_acces_seccount = read_track ? SUDT->spt : 1;
1023
1024 udelay(25);
1025
1026 /* Start operation */
1027 dma_wd.dma_mode_status = FDCSELREG_STP | rwflag;
1028 udelay(25);
1029 SET_IRQ_HANDLER( fd_rwsec_done );
1030 dma_wd.fdc_acces_seccount =
1031 (get_head_settle_flag() |
1032 (rwflag ? FDCCMD_WRSEC : (FDCCMD_RDSEC | (read_track ? FDCCMDADD_M : 0))));
1033
1034 old_motoron = MotorOn;
1035 MotorOn = 1;
1036 NeedSeek = 1;
1037 /* wait for interrupt */
1038
1039 if (read_track) {
1040 /* If reading a whole track, wait about one disk rotation and
1041 * then check if all sectors are read. The FDC will even
1042 * search for the first non-existent sector and need 1 sec to
1043 * recognise that it isn't present :-(
1044 */
1045 MultReadInProgress = 1;
1046 mod_timer(&readtrack_timer,
1047 /* 1 rot. + 5 rot.s if motor was off */
1048 jiffies + HZ/5 + (old_motoron ? 0 : HZ));
1049 }
1050 start_timeout();
1051}
1052
1053
24ed960a 1054static void fd_readtrack_check(struct timer_list *unused)
1da177e4
LT		 1055{
1056 unsigned long flags, addr, addr2;
1057
1058 local_irq_save(flags);
1059
1060 if (!MultReadInProgress) {
1061 /* This prevents a race condition that could arise if the
1062 * interrupt is triggered while the calling of this timer
1063 * callback function takes place. The IRQ function then has
1064 * already cleared 'MultReadInProgress' when flow of control
1065 * gets here.
1066 */
1067 local_irq_restore(flags);
1068 return;
1069 }
1070
1071 /* get the current DMA address */
1072 /* ++ f.a. read twice to avoid being fooled by switcher */
1073 addr = 0;
1074 do {
1075 addr2 = addr;
1076 addr = dma_wd.dma_lo & 0xff;
1077 MFPDELAY();
1078 addr |= (dma_wd.dma_md & 0xff) << 8;
1079 MFPDELAY();
1080 if (ATARIHW_PRESENT( EXTD_DMA ))
1081 addr |= (st_dma_ext_dmahi & 0xffff) << 16;
1082 else
1083 addr |= (dma_wd.dma_hi & 0xff) << 16;
1084 MFPDELAY();
1085 } while(addr != addr2);
1086
1087 if (addr >= PhysTrackBuffer + SUDT->spt*512) {
1088 /* already read enough data, force an FDC interrupt to stop
1089 * the read operation
1090 */
1091 SET_IRQ_HANDLER( NULL );
1092 MultReadInProgress = 0;
1093 local_irq_restore(flags);
1094 DPRINT(("fd_readtrack_check(): done\n"));
1095 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1096 udelay(25);
1097
1098 /* No error until now -- the FDC would have interrupted
1099 * otherwise!
1100 */
1101 fd_rwsec_done1(0);
1102 }
1103 else {
1104 /* not yet finished, wait another tenth rotation */
1105 local_irq_restore(flags);
1106 DPRINT(("fd_readtrack_check(): not yet finished\n"));
1107 mod_timer(&readtrack_timer, jiffies + HZ/5/10);
1108 }
1109}
1110
1111
1112static void fd_rwsec_done( int status )
1113{
1114 DPRINT(("fd_rwsec_done()\n"));
1115
1116 if (read_track) {
1117 del_timer(&readtrack_timer);
1118 if (!MultReadInProgress)
1119 return;
1120 MultReadInProgress = 0;
1121 }
1122 fd_rwsec_done1(status);
1123}
1124
1125static void fd_rwsec_done1(int status)
1126{
1127 unsigned int track;
1128
1129 stop_timeout();
1130
1131 /* Correct the track if stretch != 0 */
1132 if (SUDT->stretch) {
1133 track = FDC_READ( FDCREG_TRACK);
1134 MFPDELAY();
1135 FDC_WRITE( FDCREG_TRACK, track << SUDT->stretch);
1136 }
1137
1138 if (!UseTrackbuffer) {
1139 dma_wd.dma_mode_status = 0x90;
1140 MFPDELAY();
1141 if (!(dma_wd.dma_mode_status & 0x01)) {
1142 printk(KERN_ERR "fd%d: DMA error\n", SelectedDrive );
1143 goto err_end;
1144 }
1145 }
1146 MFPDELAY();
1147
1148 if (ReqCmd == WRITE && (status & FDCSTAT_WPROT)) {
1149 printk(KERN_NOTICE "fd%d: is write protected\n", SelectedDrive );
1150 goto err_end;
1151 }
1152 if ((status & FDCSTAT_RECNF) &&
1153 /* RECNF is no error after a multiple read when the FDC
1154 searched for a non-existent sector! */
1155 !(read_track && FDC_READ(FDCREG_SECTOR) > SUDT->spt)) {
1156 if (Probing) {
5ceadd2a 1157 if (SUDT > atari_disk_type) {
1da177e4
LT		 1158 if (SUDT[-1].blocks > ReqBlock) {
1159 /* try another disk type */
1160 SUDT--;
bf9c0538 1161 set_capacity(unit[SelectedDrive].disk[0],
1da177e4
LT		 1162 SUDT->blocks);
1163 } else
1164 Probing = 0;
1165 }
1166 else {
1167 if (SUD.flags & FTD_MSG)
1168 printk(KERN_INFO "fd%d: Auto-detected floppy type %s\n",
1169 SelectedDrive, SUDT->name );
1170 Probing=0;
1171 }
1172 } else {
1173/* record not found, but not probing. Maybe stretch wrong ? Restart probing */
1174 if (SUD.autoprobe) {
5ceadd2a 1175 SUDT = atari_disk_type + StartDiskType[DriveType];
bf9c0538 1176 set_capacity(unit[SelectedDrive].disk[0],
1da177e4
LT		 1177 SUDT->blocks);
1178 Probing = 1;
1179 }
1180 }
1181 if (Probing) {
1182 if (ATARIHW_PRESENT(FDCSPEED)) {
1183 dma_wd.fdc_speed = SUDT->fdc_speed;
1184 MFPDELAY();
1185 }
1186 setup_req_params( SelectedDrive );
1187 BufferDrive = -1;
1188 do_fd_action( SelectedDrive );
1189 return;
1190 }
1191
1192 printk(KERN_ERR "fd%d: sector %d not found (side %d, track %d)\n",
1193 SelectedDrive, FDC_READ (FDCREG_SECTOR), ReqSide, ReqTrack );
1194 goto err_end;
1195 }
1196 if (status & FDCSTAT_CRC) {
1197 printk(KERN_ERR "fd%d: CRC error (side %d, track %d, sector %d)\n",
1198 SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) );
1199 goto err_end;
1200 }
1201 if (status & FDCSTAT_LOST) {
1202 printk(KERN_ERR "fd%d: lost data (side %d, track %d, sector %d)\n",
1203 SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) );
1204 goto err_end;
1205 }
1206
1207 Probing = 0;
1208
1209 if (ReqCmd == READ) {
1210 if (!read_track) {
1211 void *addr;
1212 addr = ATARIHW_PRESENT( EXTD_DMA ) ? ReqData : DMABuffer;
1213 dma_cache_maintenance( virt_to_phys(addr), 512, 0 );
1214 if (!ATARIHW_PRESENT( EXTD_DMA ))
1215 copy_buffer (addr, ReqData);
1216 } else {
1217 dma_cache_maintenance( PhysTrackBuffer, MaxSectors[DriveType] * 512, 0 );
1218 BufferDrive = SelectedDrive;
1219 BufferSide = ReqSide;
1220 BufferTrack = ReqTrack;
1221 copy_buffer (SECTOR_BUFFER (ReqSector), ReqData);
1222 }
1223 }
1224
a336ca6f 1225 if (++ReqCnt < blk_rq_cur_sectors(fd_request)) {
1da177e4
LT		 1226 /* read next sector */
1227 setup_req_params( SelectedDrive );
1228 do_fd_action( SelectedDrive );
1229 }
1230 else {
1231 /* all sectors finished */
2a842aca 1232 fd_end_request_cur(BLK_STS_OK);
1da177e4
LT		 1233 }
1234 return;
1235
1236 err_end:
1237 BufferDrive = -1;
1238 fd_error();
1239}
1240
1241
1242static void fd_writetrack( void )
1243{
1244 unsigned long paddr, flags;
1245 unsigned int track;
1246
1247 DPRINT(("fd_writetrack() Tr=%d Si=%d\n", ReqTrack, ReqSide ));
1248
1249 paddr = PhysTrackBuffer;
1250 dma_cache_maintenance( paddr, BUFFER_SIZE, 1 );
1251
1252 fd_select_side( ReqSide );
1253
1254 /* Cheat for track if stretch != 0 */
1255 if (SUDT->stretch) {
1256 track = FDC_READ( FDCREG_TRACK);
1257 MFPDELAY();
1258 FDC_WRITE(FDCREG_TRACK,track >> SUDT->stretch);
1259 }
1260 udelay(40);
1261
1262 /* Setup DMA */
1263 local_irq_save(flags);
1264 dma_wd.dma_lo = (unsigned char)paddr;
1265 MFPDELAY();
1266 paddr >>= 8;
1267 dma_wd.dma_md = (unsigned char)paddr;
1268 MFPDELAY();
1269 paddr >>= 8;
1270 if (ATARIHW_PRESENT( EXTD_DMA ))
1271 st_dma_ext_dmahi = (unsigned short)paddr;
1272 else
1273 dma_wd.dma_hi = (unsigned char)paddr;
1274 MFPDELAY();
1275 local_irq_restore(flags);
1276
1277 /* Clear FIFO and switch DMA to correct mode */
1278 dma_wd.dma_mode_status = 0x190;
1279 MFPDELAY();
1280 dma_wd.dma_mode_status = 0x90;
1281 MFPDELAY();
1282 dma_wd.dma_mode_status = 0x190;
1283 MFPDELAY();
1284
1285 /* How many sectors for DMA */
1286 dma_wd.fdc_acces_seccount = BUFFER_SIZE/512;
1287 udelay(40);
1288
1289 /* Start operation */
1290 dma_wd.dma_mode_status = FDCSELREG_STP | 0x100;
1291 udelay(40);
1292 SET_IRQ_HANDLER( fd_writetrack_done );
1293 dma_wd.fdc_acces_seccount = FDCCMD_WRTRA | get_head_settle_flag();
1294
1295 MotorOn = 1;
1296 start_timeout();
1297 /* wait for interrupt */
1298}
1299
1300
1301static void fd_writetrack_done( int status )
1302{
1303 DPRINT(("fd_writetrack_done()\n"));
1304
1305 stop_timeout();
1306
1307 if (status & FDCSTAT_WPROT) {
1308 printk(KERN_NOTICE "fd%d: is write protected\n", SelectedDrive );
1309 goto err_end;
1310 }
1311 if (status & FDCSTAT_LOST) {
1312 printk(KERN_ERR "fd%d: lost data (side %d, track %d)\n",
1313 SelectedDrive, ReqSide, ReqTrack );
1314 goto err_end;
1315 }
1316
7b8a3d22 1317 complete(&format_wait);
1da177e4
LT		 1318 return;
1319
1320 err_end:
1321 fd_error();
1322}
1323
24ed960a 1324static void fd_times_out(struct timer_list *unused)
1da177e4
LT		 1325{
1326 atari_disable_irq( IRQ_MFP_FDC );
1327 if (!FloppyIRQHandler) goto end; /* int occurred after timer was fired, but
1328 * before we came here... */
1329
1330 SET_IRQ_HANDLER( NULL );
1331 /* If the timeout occurred while the readtrack_check timer was
1332 * active, we need to cancel it, else bad things will happen */
1333 if (UseTrackbuffer)
1334 del_timer( &readtrack_timer );
1335 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1336 udelay( 25 );
1337
1338 printk(KERN_ERR "floppy timeout\n" );
1339 fd_error();
1340 end:
1341 atari_enable_irq( IRQ_MFP_FDC );
1342}
1343
1344
1345/* The (noop) seek operation here is needed to make the WP bit in the
1346 * FDC status register accessible for check_change. If the last disk
1347 * operation would have been a RDSEC, this bit would always read as 0
1348 * no matter what :-( To save time, the seek goes to the track we're
1349 * already on.
1350 */
1351
1352static void finish_fdc( void )
1353{
1354 if (!NeedSeek) {
1355 finish_fdc_done( 0 );
1356 }
1357 else {
1358 DPRINT(("finish_fdc: dummy seek started\n"));
1359 FDC_WRITE (FDCREG_DATA, SUD.track);
1360 SET_IRQ_HANDLER( finish_fdc_done );
1361 FDC_WRITE (FDCREG_CMD, FDCCMD_SEEK);
1362 MotorOn = 1;
1363 start_timeout();
1364 /* we must wait for the IRQ here, because the ST-DMA
1365 is released immediately afterwards and the interrupt
1366 may be delivered to the wrong driver. */
1367 }
1368}
1369
1370
1371static void finish_fdc_done( int dummy )
1372{
1373 unsigned long flags;
1374
1375 DPRINT(("finish_fdc_done entered\n"));
1376 stop_timeout();
1377 NeedSeek = 0;
1378
1379 if (timer_pending(&fd_timer) && time_before(fd_timer.expires, jiffies + 5))
1380 /* If the check for a disk change is done too early after this
1381 * last seek command, the WP bit still reads wrong :-((
1382 */
1383 mod_timer(&fd_timer, jiffies + 5);
1384 else
1385 start_check_change_timer();
1386 start_motor_off_timer();
1387
1388 local_irq_save(flags);
1389 stdma_release();
1da177e4
LT		 1390 local_irq_restore(flags);
1391
1392 DPRINT(("finish_fdc() finished\n"));
1393}
1394
1395/* The detection of disk changes is a dark chapter in Atari history :-(
1396 * Because the "Drive ready" signal isn't present in the Atari
1397 * hardware, one has to rely on the "Write Protect". This works fine,
1398 * as long as no write protected disks are used. TOS solves this
1399 * problem by introducing tri-state logic ("maybe changed") and
1400 * looking at the serial number in block 0. This isn't possible for
1401 * Linux, since the floppy driver can't make assumptions about the
1402 * filesystem used on the disk and thus the contents of block 0. I've
1403 * chosen the method to always say "The disk was changed" if it is
1404 * unsure whether it was. This implies that every open or mount
1405 * invalidates the disk buffers if you work with write protected
1406 * disks. But at least this is better than working with incorrect data
1407 * due to unrecognised disk changes.
1408 */
1409
1a8a74f0
TH		 1410static unsigned int floppy_check_events(struct gendisk *disk,
1411 unsigned int clearing)
1da177e4
LT		 1412{
1413 struct atari_floppy_struct *p = disk->private_data;
1414 unsigned int drive = p - unit;
1415 if (test_bit (drive, &fake_change)) {
1416 /* simulated change (e.g. after formatting) */
1a8a74f0 1417 return DISK_EVENT_MEDIA_CHANGE;
1da177e4
LT		 1418 }
1419 if (test_bit (drive, &changed_floppies)) {
1420 /* surely changed (the WP signal changed at least once) */
1a8a74f0 1421 return DISK_EVENT_MEDIA_CHANGE;
1da177e4
LT		 1422 }
1423 if (UD.wpstat) {
1424 /* WP is on -> could be changed: to be sure, buffers should be
1425 * invalidated...
1426 */
1a8a74f0 1427 return DISK_EVENT_MEDIA_CHANGE;
1da177e4
LT		 1428 }
1429
1430 return 0;
1431}
1432
1433static int floppy_revalidate(struct gendisk *disk)
1434{
1435 struct atari_floppy_struct *p = disk->private_data;
1436 unsigned int drive = p - unit;
1437
1438 if (test_bit(drive, &changed_floppies) ||
1439 test_bit(drive, &fake_change) ||
1440 p->disktype == 0) {
1441 if (UD.flags & FTD_MSG)
1442 printk(KERN_ERR "floppy: clear format %p!\n", UDT);
1443 BufferDrive = -1;
1444 clear_bit(drive, &fake_change);
1445 clear_bit(drive, &changed_floppies);
1446 /* MSch: clearing geometry makes sense only for autoprobe
1447 formats, for 'permanent user-defined' parameter:
1448 restore default_params[] here if flagged valid! */
1449 if (default_params[drive].blocks == 0)
2c7af511 1450 UDT = NULL;
1da177e4
LT		 1451 else
1452 UDT = &default_params[drive];
1453 }
1454 return 0;
1455}
1456
1457
1458/* This sets up the global variables describing the current request. */
1459
1460static void setup_req_params( int drive )
1461{
1462 int block = ReqBlock + ReqCnt;
1463
1464 ReqTrack = block / UDT->spt;
1465 ReqSector = block - ReqTrack * UDT->spt + 1;
1466 ReqSide = ReqTrack & 1;
1467 ReqTrack >>= 1;
1468 ReqData = ReqBuffer + 512 * ReqCnt;
1469
1470 if (UseTrackbuffer)
c8e90782 1471 read_track = (ReqCmd == READ && fd_request->error_count == 0);
1da177e4
LT		 1472 else
1473 read_track = 0;
1474
1475 DPRINT(("Request params: Si=%d Tr=%d Se=%d Data=%08lx\n",ReqSide,
1476 ReqTrack, ReqSector, (unsigned long)ReqData ));
1477}
1478
80ff2040
JA		 1479static void ataflop_commit_rqs(struct blk_mq_hw_ctx *hctx)
1480{
1481 spin_lock_irq(&ataflop_lock);
1482 atari_disable_irq(IRQ_MFP_FDC);
1483 finish_fdc();
1484 atari_enable_irq(IRQ_MFP_FDC);
1485 spin_unlock_irq(&ataflop_lock);
1486}
1487
6ec3938c
OS		 1488static blk_status_t ataflop_queue_rq(struct blk_mq_hw_ctx *hctx,
1489 const struct blk_mq_queue_data *bd)
639e2f2a 1490{
6ec3938c
OS		 1491 struct atari_floppy_struct *floppy = bd->rq->rq_disk->private_data;
1492 int drive = floppy - unit;
1493 int type = floppy->type;
1da177e4 1494
6ec3938c
OS		 1495 spin_lock_irq(&ataflop_lock);
1496 if (fd_request) {
1497 spin_unlock_irq(&ataflop_lock);
1498 return BLK_STS_DEV_RESOURCE;
1499 }
1500 if (!stdma_try_lock(floppy_irq, NULL)) {
1501 spin_unlock_irq(&ataflop_lock);
1502 return BLK_STS_RESOURCE;
1503 }
1504 fd_request = bd->rq;
1505 blk_mq_start_request(fd_request);
1da177e4 1506
6ec3938c 1507 atari_disable_irq( IRQ_MFP_FDC );
1da177e4
LT		 1508
1509 IsFormatting = 0;
1510
1da177e4
LT		 1511 if (!UD.connected) {
1512 /* drive not connected */
1513 printk(KERN_ERR "Unknown Device: fd%d\n", drive );
2a842aca 1514 fd_end_request_cur(BLK_STS_IOERR);
6ec3938c 1515 goto out;
1da177e4
LT		 1516 }
1517
1518 if (type == 0) {
1519 if (!UDT) {
1520 Probing = 1;
5ceadd2a 1521 UDT = atari_disk_type + StartDiskType[DriveType];
bf9c0538 1522 set_capacity(bd->rq->rq_disk, UDT->blocks);
1da177e4
LT		 1523 UD.autoprobe = 1;
1524 }
1525 }
1526 else {
1527 /* user supplied disk type */
1528 if (--type >= NUM_DISK_MINORS) {
1529 printk(KERN_WARNING "fd%d: invalid disk format", drive );
2a842aca 1530 fd_end_request_cur(BLK_STS_IOERR);
6ec3938c 1531 goto out;
1da177e4
LT		 1532 }
1533 if (minor2disktype[type].drive_types > DriveType) {
1534 printk(KERN_WARNING "fd%d: unsupported disk format", drive );
2a842aca 1535 fd_end_request_cur(BLK_STS_IOERR);
6ec3938c 1536 goto out;
1da177e4
LT		 1537 }
1538 type = minor2disktype[type].index;
5ceadd2a 1539 UDT = &atari_disk_type[type];
bf9c0538 1540 set_capacity(bd->rq->rq_disk, UDT->blocks);
1da177e4
LT		 1541 UD.autoprobe = 0;
1542 }
1da177e4
LT		 1543
1544 /* stop deselect timer */
1545 del_timer( &motor_off_timer );
1546
1547 ReqCnt = 0;
a336ca6f
TH		 1548 ReqCmd = rq_data_dir(fd_request);
1549 ReqBlock = blk_rq_pos(fd_request);
b4f42e28 1550 ReqBuffer = bio_data(fd_request->bio);
1da177e4
LT		 1551 setup_req_params( drive );
1552 do_fd_action( drive );
1553
6ec3938c
OS		 1554 if (bd->last)
1555 finish_fdc();
1da177e4 1556 atari_enable_irq( IRQ_MFP_FDC );
6ec3938c
OS		 1557
1558out:
1559 spin_unlock_irq(&ataflop_lock);
1560 return BLK_STS_OK;
1da177e4
LT		 1561}
1562
8a6cfeb6 1563static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode,
1da177e4
LT		 1564 unsigned int cmd, unsigned long param)
1565{
60ad2340 1566 struct gendisk *disk = bdev->bd_disk;
1da177e4
LT		 1567 struct atari_floppy_struct *floppy = disk->private_data;
1568 int drive = floppy - unit;
1569 int type = floppy->type;
1570 struct atari_format_descr fmt_desc;
1571 struct atari_disk_type *dtp;
1572 struct floppy_struct getprm;
1573 int settype;
1574 struct floppy_struct setprm;
2c7af511 1575 void __user *argp = (void __user *)param;
1da177e4
LT		 1576
1577 switch (cmd) {
1578 case FDGETPRM:
1579 if (type) {
1580 if (--type >= NUM_DISK_MINORS)
1581 return -ENODEV;
1582 if (minor2disktype[type].drive_types > DriveType)
1583 return -ENODEV;
1584 type = minor2disktype[type].index;
5ceadd2a 1585 dtp = &atari_disk_type[type];
1da177e4
LT		 1586 if (UD.flags & FTD_MSG)
1587 printk (KERN_ERR "floppy%d: found dtp %p name %s!\n",
1588 drive, dtp, dtp->name);
1589 }
1590 else {
1591 if (!UDT)
1592 return -ENXIO;
1593 else
1594 dtp = UDT;
1595 }
1596 memset((void *)&getprm, 0, sizeof(getprm));
1597 getprm.size = dtp->blocks;
1598 getprm.sect = dtp->spt;
1599 getprm.head = 2;
1600 getprm.track = dtp->blocks/dtp->spt/2;
1601 getprm.stretch = dtp->stretch;
2c7af511 1602 if (copy_to_user(argp, &getprm, sizeof(getprm)))
1da177e4
LT		 1603 return -EFAULT;
1604 return 0;
1605 }
1606 switch (cmd) {
1607 case FDSETPRM:
1608 case FDDEFPRM:
1609 /*
1610 * MSch 7/96: simple 'set geometry' case: just set the
1611 * 'default' device params (minor == 0).
1612 * Currently, the drive geometry is cleared after each
1613 * disk change and subsequent revalidate()! simple
1614 * implementation of FDDEFPRM: save geometry from a
1615 * FDDEFPRM call and restore it in floppy_revalidate() !
1616 */
1617
1618 /* get the parameters from user space */
1619 if (floppy->ref != 1 && floppy->ref != -1)
1620 return -EBUSY;
2c7af511 1621 if (copy_from_user(&setprm, argp, sizeof(setprm)))
1da177e4
LT		 1622 return -EFAULT;
1623 /*
1624 * first of all: check for floppy change and revalidate,
1625 * or the next access will revalidate - and clear UDT :-(
1626 */
1627
1a8a74f0 1628 if (floppy_check_events(disk, 0))
1da177e4
LT		 1629 floppy_revalidate(disk);
1630
1631 if (UD.flags & FTD_MSG)
1632 printk (KERN_INFO "floppy%d: setting size %d spt %d str %d!\n",
1633 drive, setprm.size, setprm.sect, setprm.stretch);
1634
1635 /* what if type > 0 here? Overwrite specified entry ? */
1636 if (type) {
1637 /* refuse to re-set a predefined type for now */
1da177e4
LT		 1638 return -EINVAL;
1639 }
1640
1641 /*
1642 * type == 0: first look for a matching entry in the type list,
1643 * and set the UD.disktype field to use the perdefined entry.
1644 * TODO: add user-defined format to head of autoprobe list ?
1645 * Useful to include the user-type for future autodetection!
1646 */
1647
1648 for (settype = 0; settype < NUM_DISK_MINORS; settype++) {
1649 int setidx = 0;
1650 if (minor2disktype[settype].drive_types > DriveType) {
1651 /* skip this one, invalid for drive ... */
1652 continue;
1653 }
1654 setidx = minor2disktype[settype].index;
5ceadd2a 1655 dtp = &atari_disk_type[setidx];
1da177e4
LT		 1656
1657 /* found matching entry ?? */
1658 if ( dtp->blocks == setprm.size
1659 && dtp->spt == setprm.sect
1660 && dtp->stretch == setprm.stretch ) {
1661 if (UD.flags & FTD_MSG)
1662 printk (KERN_INFO "floppy%d: setting %s %p!\n",
1663 drive, dtp->name, dtp);
1664 UDT = dtp;
bf9c0538 1665 set_capacity(disk, UDT->blocks);
1da177e4
LT		 1666
1667 if (cmd == FDDEFPRM) {
1668 /* save settings as permanent default type */
1669 default_params[drive].name = dtp->name;
1670 default_params[drive].spt = dtp->spt;
1671 default_params[drive].blocks = dtp->blocks;
1672 default_params[drive].fdc_speed = dtp->fdc_speed;
1673 default_params[drive].stretch = dtp->stretch;
1674 }
1675
1676 return 0;
1677 }
1678
1679 }
1680
1681 /* no matching disk type found above - setting user_params */
1682
1683 if (cmd == FDDEFPRM) {
1684 /* set permanent type */
1685 dtp = &default_params[drive];
1686 } else
1687 /* set user type (reset by disk change!) */
1688 dtp = &user_params[drive];
1689
1690 dtp->name = "user format";
1691 dtp->blocks = setprm.size;
1692 dtp->spt = setprm.sect;
1693 if (setprm.sect > 14)
1694 dtp->fdc_speed = 3;
1695 else
1696 dtp->fdc_speed = 0;
1697 dtp->stretch = setprm.stretch;
1698
1699 if (UD.flags & FTD_MSG)
1700 printk (KERN_INFO "floppy%d: blk %d spt %d str %d!\n",
1701 drive, dtp->blocks, dtp->spt, dtp->stretch);
1702
1703 /* sanity check */
8f474287 1704 if (setprm.track != dtp->blocks/dtp->spt/2 ||
6ec3938c 1705 setprm.head != 2)
1da177e4 1706 return -EINVAL;
1da177e4
LT		 1707
1708 UDT = dtp;
bf9c0538 1709 set_capacity(disk, UDT->blocks);
1da177e4
LT		 1710
1711 return 0;
1712 case FDMSGON:
1713 UD.flags |= FTD_MSG;
1714 return 0;
1715 case FDMSGOFF:
1716 UD.flags &= ~FTD_MSG;
1717 return 0;
1718 case FDSETEMSGTRESH:
1719 return -EINVAL;
1720 case FDFMTBEG:
1721 return 0;
1722 case FDFMTTRK:
1723 if (floppy->ref != 1 && floppy->ref != -1)
1724 return -EBUSY;
2c7af511 1725 if (copy_from_user(&fmt_desc, argp, sizeof(fmt_desc)))
1da177e4
LT		 1726 return -EFAULT;
1727 return do_format(drive, type, &fmt_desc);
1728 case FDCLRPRM:
1729 UDT = NULL;
1730 /* MSch: invalidate default_params */
1731 default_params[drive].blocks = 0;
bf9c0538 1732 set_capacity(disk, MAX_DISK_SIZE * 2);
df561f66 1733 fallthrough;
1da177e4
LT		 1734 case FDFMTEND:
1735 case FDFLUSH:
1736 /* invalidate the buffer track to force a reread */
1737 BufferDrive = -1;
1738 set_bit(drive, &fake_change);
22f97164
CH		 1739 if (bdev_check_media_change(bdev))
1740 floppy_revalidate(bdev->bd_disk);
1da177e4
LT		 1741 return 0;
1742 default:
1743 return -EINVAL;
1744 }
1745}
1746
8a6cfeb6
AB		 1747static int fd_ioctl(struct block_device *bdev, fmode_t mode,
1748 unsigned int cmd, unsigned long arg)
1749{
1750 int ret;
1751
2a48fc0a 1752 mutex_lock(&ataflop_mutex);
8a6cfeb6 1753 ret = fd_locked_ioctl(bdev, mode, cmd, arg);
2a48fc0a 1754 mutex_unlock(&ataflop_mutex);
8a6cfeb6
AB		 1755
1756 return ret;
1757}
1da177e4
LT		 1758
1759/* Initialize the 'unit' variable for drive 'drive' */
1760
1761static void __init fd_probe( int drive )
1762{
1763 UD.connected = 0;
1764 UDT = NULL;
1765
1766 if (!fd_test_drive_present( drive ))
1767 return;
1768
1769 UD.connected = 1;
1770 UD.track = 0;
1771 switch( UserSteprate[drive] ) {
1772 case 2:
1773 UD.steprate = FDCSTEP_2;
1774 break;
1775 case 3:
1776 UD.steprate = FDCSTEP_3;
1777 break;
1778 case 6:
1779 UD.steprate = FDCSTEP_6;
1780 break;
1781 case 12:
1782 UD.steprate = FDCSTEP_12;
1783 break;
1784 default: /* should be -1 for "not set by user" */
1785 if (ATARIHW_PRESENT( FDCSPEED ) || MACH_IS_MEDUSA)
1786 UD.steprate = FDCSTEP_3;
1787 else
1788 UD.steprate = FDCSTEP_6;
1789 break;
1790 }
1791 MotorOn = 1; /* from probe restore operation! */
1792}
1793
1794
1795/* This function tests the physical presence of a floppy drive (not
1796 * whether a disk is inserted). This is done by issuing a restore
1797 * command, waiting max. 2 seconds (that should be enough to move the
1798 * head across the whole disk) and looking at the state of the "TR00"
1799 * signal. This should now be raised if there is a drive connected
1800 * (and there is no hardware failure :-) Otherwise, the drive is
1801 * declared absent.
1802 */
1803
1804static int __init fd_test_drive_present( int drive )
1805{
1806 unsigned long timeout;
1807 unsigned char status;
1808 int ok;
1809
1810 if (drive >= (MACH_IS_FALCON ? 1 : 2)) return( 0 );
1811 fd_select_drive( drive );
1812
1813 /* disable interrupt temporarily */
1814 atari_turnoff_irq( IRQ_MFP_FDC );
1815 FDC_WRITE (FDCREG_TRACK, 0xff00);
1816 FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | FDCCMDADD_H | FDCSTEP_6 );
1817
1818 timeout = jiffies + 2*HZ+HZ/2;
1819 while (time_before(jiffies, timeout))
3d92e8f3 1820 if (!(st_mfp.par_dt_reg & 0x20))
1da177e4
LT		 1821 break;
1822
1823 status = FDC_READ( FDCREG_STATUS );
1824 ok = (status & FDCSTAT_TR00) != 0;
1825
1826 /* force interrupt to abort restore operation (FDC would try
1827 * about 50 seconds!) */
1828 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1829 udelay(500);
1830 status = FDC_READ( FDCREG_STATUS );
1831 udelay(20);
1832
1833 if (ok) {
1834 /* dummy seek command to make WP bit accessible */
1835 FDC_WRITE( FDCREG_DATA, 0 );
1836 FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK );
3d92e8f3 1837 while( st_mfp.par_dt_reg & 0x20 )
1da177e4
LT		 1838 ;
1839 status = FDC_READ( FDCREG_STATUS );
1840 }
1841
1842 atari_turnon_irq( IRQ_MFP_FDC );
1843 return( ok );
1844}
1845
1846
1847/* Look how many and which kind of drives are connected. If there are
1848 * floppies, additionally start the disk-change and motor-off timers.
1849 */
1850
1851static void __init config_types( void )
1852{
1853 int drive, cnt = 0;
1854
1855 /* for probing drives, set the FDC speed to 8 MHz */
1856 if (ATARIHW_PRESENT(FDCSPEED))
1857 dma_wd.fdc_speed = 0;
1858
1859 printk(KERN_INFO "Probing floppy drive(s):\n");
1860 for( drive = 0; drive < FD_MAX_UNITS; drive++ ) {
1861 fd_probe( drive );
1862 if (UD.connected) {
1863 printk(KERN_INFO "fd%d\n", drive);
1864 ++cnt;
1865 }
1866 }
1867
1868 if (FDC_READ( FDCREG_STATUS ) & FDCSTAT_BUSY) {
1869 /* If FDC is still busy from probing, give it another FORCI
1870 * command to abort the operation. If this isn't done, the FDC
1871 * will interrupt later and its IRQ line stays low, because
1872 * the status register isn't read. And this will block any
1873 * interrupts on this IRQ line :-(
1874 */
1875 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
1876 udelay(500);
1877 FDC_READ( FDCREG_STATUS );
1878 udelay(20);
1879 }
1880
1881 if (cnt > 0) {
1882 start_motor_off_timer();
1883 if (cnt == 1) fd_select_drive( 0 );
1884 start_check_change_timer();
1885 }
1886}
1887
1888/*
1889 * floppy_open check for aliasing (/dev/fd0 can be the same as
1890 * /dev/PS0 etc), and disallows simultaneous access to the same
1891 * drive with different device numbers.
1892 */
1893
60ad2340 1894static int floppy_open(struct block_device *bdev, fmode_t mode)
1da177e4 1895{
60ad2340
AV		 1896 struct atari_floppy_struct *p = bdev->bd_disk->private_data;
1897 int type = MINOR(bdev->bd_dev) >> 2;
1da177e4
LT		 1898
1899 DPRINT(("fd_open: type=%d\n",type));
1900 if (p->ref && p->type != type)
1901 return -EBUSY;
1902
60ad2340 1903 if (p->ref == -1 || (p->ref && mode & FMODE_EXCL))
1da177e4
LT		 1904 return -EBUSY;
1905
60ad2340 1906 if (mode & FMODE_EXCL)
1da177e4
LT		 1907 p->ref = -1;
1908 else
1909 p->ref++;
1910
1911 p->type = type;
1912
60ad2340 1913 if (mode & FMODE_NDELAY)
1da177e4
LT		 1914 return 0;
1915
60ad2340 1916 if (mode & (FMODE_READ|FMODE_WRITE)) {
22f97164
CH		 1917 if (bdev_check_media_change(bdev))
1918 floppy_revalidate(bdev->bd_disk);
60ad2340 1919 if (mode & FMODE_WRITE) {
1da177e4
LT		 1920 if (p->wpstat) {
1921 if (p->ref < 0)
1922 p->ref = 0;
1923 else
1924 p->ref--;
1da177e4
LT		 1925 return -EROFS;
1926 }
1927 }
1928 }
1929 return 0;
1930}
1931
6e9624b8
AB		 1932static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
1933{
1934 int ret;
1935
2a48fc0a 1936 mutex_lock(&ataflop_mutex);
6e9624b8 1937 ret = floppy_open(bdev, mode);
2a48fc0a 1938 mutex_unlock(&ataflop_mutex);
6e9624b8
AB		 1939
1940 return ret;
1941}
1da177e4 1942
db2a144b 1943static void floppy_release(struct gendisk *disk, fmode_t mode)
1da177e4 1944{
60ad2340 1945 struct atari_floppy_struct *p = disk->private_data;
2a48fc0a 1946 mutex_lock(&ataflop_mutex);
1da177e4
LT		 1947 if (p->ref < 0)
1948 p->ref = 0;
1949 else if (!p->ref--) {
1950 printk(KERN_ERR "floppy_release with fd_ref == 0");
1951 p->ref = 0;
1952 }
2a48fc0a 1953 mutex_unlock(&ataflop_mutex);
1da177e4
LT		 1954}
1955
83d5cde4 1956static const struct block_device_operations floppy_fops = {
1da177e4 1957 .owner = THIS_MODULE,
6e9624b8 1958 .open = floppy_unlocked_open,
60ad2340 1959 .release = floppy_release,
8a6cfeb6 1960 .ioctl = fd_ioctl,
1a8a74f0 1961 .check_events = floppy_check_events,
1da177e4
LT		 1962};
1963
6ec3938c
OS		 1964static const struct blk_mq_ops ataflop_mq_ops = {
1965 .queue_rq = ataflop_queue_rq,
80ff2040 1966 .commit_rqs = ataflop_commit_rqs,
6ec3938c
OS		 1967};
1968
bf9c0538 1969static int ataflop_alloc_disk(unsigned int drive, unsigned int type)
1da177e4 1970{
bf9c0538
CH		 1971 struct gendisk *disk;
1972 int ret;
1973
1974 disk = alloc_disk(1);
1975 if (!disk)
1976 return -ENOMEM;
1977
1978 disk->queue = blk_mq_init_queue(&unit[drive].tag_set);
1979 if (IS_ERR(disk->queue)) {
1980 ret = PTR_ERR(disk->queue);
1981 disk->queue = NULL;
1982 put_disk(disk);
1983 return ret;
1984 }
1985
1986 disk->major = FLOPPY_MAJOR;
1987 disk->first_minor = drive + (type << 2);
1988 sprintf(disk->disk_name, "fd%d", drive);
1989 disk->fops = &floppy_fops;
1990 disk->events = DISK_EVENT_MEDIA_CHANGE;
1991 disk->private_data = &unit[drive];
1992 set_capacity(disk, MAX_DISK_SIZE * 2);
1993
1994 unit[drive].disk[type] = disk;
1995 return 0;
1996}
1997
1998static DEFINE_MUTEX(ataflop_probe_lock);
1999
2000static void ataflop_probe(dev_t dev)
2001{
2002 int drive = MINOR(dev) & 3;
2003 int type = MINOR(dev) >> 2;
2004
1da177e4 2005 if (drive >= FD_MAX_UNITS || type > NUM_DISK_MINORS)
bf9c0538
CH		 2006 return;
2007 mutex_lock(&ataflop_probe_lock);
2008 if (!unit[drive].disk[type]) {
2009 if (ataflop_alloc_disk(drive, type) == 0)
2010 add_disk(unit[drive].disk[type]);
2011 }
2012 mutex_unlock(&ataflop_probe_lock);
1da177e4
LT		 2013}
2014
2015static int __init atari_floppy_init (void)
2016{
2017 int i;
6ec3938c 2018 int ret;
1da177e4
LT		 2019
2020 if (!MACH_IS_ATARI)
2021 /* Amiga, Mac, ... don't have Atari-compatible floppy :-) */
e945b568 2022 return -ENODEV;
1da177e4 2023
bf9c0538
CH		 2024 mutex_lock(&ataflop_probe_lock);
2025 ret = __register_blkdev(FLOPPY_MAJOR, "fd", ataflop_probe);
2026 if (ret)
2027 goto out_unlock;
1da177e4
LT		 2028
2029 for (i = 0; i < FD_MAX_UNITS; i++) {
bf9c0538
CH		 2030 memset(&unit[i].tag_set, 0, sizeof(unit[i].tag_set));
2031 unit[i].tag_set.ops = &ataflop_mq_ops;
2032 unit[i].tag_set.nr_hw_queues = 1;
2033 unit[i].tag_set.nr_maps = 1;
2034 unit[i].tag_set.queue_depth = 2;
2035 unit[i].tag_set.numa_node = NUMA_NO_NODE;
2036 unit[i].tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
2037 ret = blk_mq_alloc_tag_set(&unit[i].tag_set);
2038 if (ret)
6ec3938c 2039 goto err;
71327f54 2040
bf9c0538
CH		 2041 ret = ataflop_alloc_disk(i, 0);
2042 if (ret) {
2043 blk_mq_free_tag_set(&unit[i].tag_set);
6ec3938c
OS		 2044 goto err;
2045 }
1da177e4
LT		 2046 }
2047
2048 if (UseTrackbuffer < 0)
2049 /* not set by user -> use default: for now, we turn
2050 track buffering off for all Medusas, though it
2051 could be used with ones that have a counter
2052 card. But the test is too hard :-( */
2053 UseTrackbuffer = !MACH_IS_MEDUSA;
2054
2055 /* initialize variables */
2056 SelectedDrive = -1;
2057 BufferDrive = -1;
2058
2059 DMABuffer = atari_stram_alloc(BUFFER_SIZE+512, "ataflop");
2060 if (!DMABuffer) {
2061 printk(KERN_ERR "atari_floppy_init: cannot get dma buffer\n");
6ec3938c
OS		 2062 ret = -ENOMEM;
2063 goto err;
1da177e4
LT		 2064 }
2065 TrackBuffer = DMABuffer + 512;
a4de73fb 2066 PhysDMABuffer = atari_stram_to_phys(DMABuffer);
1da177e4
LT		 2067 PhysTrackBuffer = virt_to_phys(TrackBuffer);
2068 BufferDrive = BufferSide = BufferTrack = -1;
2069
1da177e4
LT		 2070 for (i = 0; i < FD_MAX_UNITS; i++) {
2071 unit[i].track = -1;
2072 unit[i].flags = 0;
bf9c0538 2073 add_disk(unit[i].disk[0]);
1da177e4
LT		 2074 }
2075
1da177e4
LT		 2076 printk(KERN_INFO "Atari floppy driver: max. %cD, %strack buffering\n",
2077 DriveType == 0 ? 'D' : DriveType == 1 ? 'H' : 'E',
2078 UseTrackbuffer ? "" : "no ");
2079 config_types();
2080
2081 return 0;
6ec3938c
OS		 2082
2083err:
49379e6d 2084 while (--i >= 0) {
bf9c0538
CH		 2085 blk_cleanup_queue(unit[i].disk[0]->queue);
2086 put_disk(unit[i].disk[0]);
49379e6d 2087 blk_mq_free_tag_set(&unit[i].tag_set);
49379e6d 2088 }
639e2f2a 2089
1da177e4 2090 unregister_blkdev(FLOPPY_MAJOR, "fd");
bf9c0538
CH		 2091out_unlock:
2092 mutex_unlock(&ataflop_probe_lock);
6ec3938c 2093 return ret;
1da177e4
LT		 2094}
2095
63907435
AV		 2096#ifndef MODULE
2097static int __init atari_floppy_setup(char *str)
1da177e4 2098{
63907435 2099 int ints[3 + FD_MAX_UNITS];
1da177e4 2100 int i;
63907435
AV		 2101
2102 if (!MACH_IS_ATARI)
2103 return 0;
2104
2105 str = get_options(str, 3 + FD_MAX_UNITS, ints);
1da177e4
LT		 2106
2107 if (ints[0] < 1) {
2108 printk(KERN_ERR "ataflop_setup: no arguments!\n" );
63907435 2109 return 0;
1da177e4
LT		 2110 }
2111 else if (ints[0] > 2+FD_MAX_UNITS) {
2112 printk(KERN_ERR "ataflop_setup: too many arguments\n" );
2113 }
2114
2115 if (ints[1] < 0 || ints[1] > 2)
2116 printk(KERN_ERR "ataflop_setup: bad drive type\n" );
2117 else
2118 DriveType = ints[1];
2119
2120 if (ints[0] >= 2)
2121 UseTrackbuffer = (ints[2] > 0);
2122
2123 for( i = 3; i <= ints[0] && i-3 < FD_MAX_UNITS; ++i ) {
2124 if (ints[i] != 2 && ints[i] != 3 && ints[i] != 6 && ints[i] != 12)
2125 printk(KERN_ERR "ataflop_setup: bad steprate\n" );
2126 else
2127 UserSteprate[i-3] = ints[i];
2128 }
63907435 2129 return 1;
1da177e4
LT		 2130}
2131
63907435
AV		 2132__setup("floppy=", atari_floppy_setup);
2133#endif
2134
2135static void __exit atari_floppy_exit(void)
1da177e4 2136{
bf9c0538
CH		 2137 int i, type;
2138
1da177e4 2139 for (i = 0; i < FD_MAX_UNITS; i++) {
bf9c0538
CH		 2140 for (type = 0; type < NUM_DISK_MINORS; type++) {
2141 if (!unit[i].disk[type])
2142 continue;
2143 del_gendisk(unit[i].disk[type]);
2144 blk_cleanup_queue(unit[i].disk[type]->queue);
2145 put_disk(unit[i].disk[type]);
2146 }
6ec3938c 2147 blk_mq_free_tag_set(&unit[i].tag_set);
1da177e4
LT		 2148 }
2149 unregister_blkdev(FLOPPY_MAJOR, "fd");
2150
1da177e4
LT		 2151 del_timer_sync(&fd_timer);
2152 atari_stram_free( DMABuffer );
2153}
2154
2155module_init(atari_floppy_init)
2156module_exit(atari_floppy_exit)
2157
2158MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)