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