1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * drivers/block/ataflop.c 4 * 5 * Copyright (C) 1993 Greg Harp 6 * Atari Support by Bjoern Brauel, Roman Hodek 7 * 8 * Big cleanup Sep 11..14 1994 Roman Hodek: 9 * - Driver now works interrupt driven 10 * - Support for two drives; should work, but I cannot test that :-( 11 * - Reading is done in whole tracks and buffered to speed up things 12 * - Disk change detection and drive deselecting after motor-off 13 * similar to TOS 14 * - Autodetection of disk format (DD/HD); untested yet, because I 15 * don't have an HD drive :-( 16 * 17 * Fixes Nov 13 1994 Martin Schaller: 18 * - Autodetection works now 19 * - Support for 5 1/4'' disks 20 * - Removed drive type (unknown on atari) 21 * - Do seeks with 8 Mhz 22 * 23 * Changes by Andreas Schwab: 24 * - After errors in multiple read mode try again reading single sectors 25 * (Feb 1995): 26 * - Clean up error handling 27 * - Set blk_size for proper size checking 28 * - Initialize track register when testing presence of floppy 29 * - Implement some ioctl's 30 * 31 * Changes by Torsten Lang: 32 * - When probing the floppies we should add the FDCCMDADD_H flag since 33 * the FDC will otherwise wait forever when no disk is inserted... 34 * 35 * ++ Freddi Aschwanden (fa) 20.9.95 fixes for medusa: 36 * - MFPDELAY() after each FDC access -> atari 37 * - more/other disk formats 38 * - DMA to the block buffer directly if we have a 32bit DMA 39 * - for medusa, the step rate is always 3ms 40 * - on medusa, use only cache_push() 41 * Roman: 42 * - Make disk format numbering independent from minors 43 * - Let user set max. supported drive type (speeds up format 44 * detection, saves buffer space) 45 * 46 * Roman 10/15/95: 47 * - implement some more ioctls 48 * - disk formatting 49 * 50 * Andreas 95/12/12: 51 * - increase gap size at start of track for HD/ED disks 52 * 53 * Michael (MSch) 11/07/96: 54 * - implemented FDSETPRM and FDDEFPRM ioctl 55 * 56 * Andreas (97/03/19): 57 * - implemented missing BLK* ioctls 58 * 59 * Things left to do: 60 * - Formatting 61 * - Maybe a better strategy for disk change detection (does anyone 62 * know one?) 63 */ 64 65 #include <linux/module.h> 66 67 #include <linux/fd.h> 68 #include <linux/delay.h> 69 #include <linux/init.h> 70 #include <linux/blk-mq.h> 71 #include <linux/major.h> 72 #include <linux/mutex.h> 73 #include <linux/completion.h> 74 #include <linux/wait.h> 75 76 #include <asm/atariints.h> 77 #include <asm/atari_stdma.h> 78 #include <asm/atari_stram.h> 79 80 #define FD_MAX_UNITS 2 81 82 #undef DEBUG 83 84 static DEFINE_MUTEX(ataflop_mutex); 85 static struct request *fd_request; 86 87 /* 88 * WD1772 stuff 89 */ 90 91 /* register codes */ 92 93 #define FDCSELREG_STP (0x80) /* command/status register */ 94 #define FDCSELREG_TRA (0x82) /* track register */ 95 #define FDCSELREG_SEC (0x84) /* sector register */ 96 #define FDCSELREG_DTA (0x86) /* data register */ 97 98 /* register names for FDC_READ/WRITE macros */ 99 100 #define FDCREG_CMD 0 101 #define FDCREG_STATUS 0 102 #define FDCREG_TRACK 2 103 #define FDCREG_SECTOR 4 104 #define FDCREG_DATA 6 105 106 /* command opcodes */ 107 108 #define FDCCMD_RESTORE (0x00) /* - */ 109 #define FDCCMD_SEEK (0x10) /* | */ 110 #define FDCCMD_STEP (0x20) /* | TYP 1 Commands */ 111 #define FDCCMD_STIN (0x40) /* | */ 112 #define FDCCMD_STOT (0x60) /* - */ 113 #define FDCCMD_RDSEC (0x80) /* - TYP 2 Commands */ 114 #define FDCCMD_WRSEC (0xa0) /* - " */ 115 #define FDCCMD_RDADR (0xc0) /* - */ 116 #define FDCCMD_RDTRA (0xe0) /* | TYP 3 Commands */ 117 #define FDCCMD_WRTRA (0xf0) /* - */ 118 #define FDCCMD_FORCI (0xd0) /* - TYP 4 Command */ 119 120 /* command modifier bits */ 121 122 #define FDCCMDADD_SR6 (0x00) /* step rate settings */ 123 #define FDCCMDADD_SR12 (0x01) 124 #define FDCCMDADD_SR2 (0x02) 125 #define FDCCMDADD_SR3 (0x03) 126 #define FDCCMDADD_V (0x04) /* verify */ 127 #define FDCCMDADD_H (0x08) /* wait for spin-up */ 128 #define FDCCMDADD_U (0x10) /* update track register */ 129 #define FDCCMDADD_M (0x10) /* multiple sector access */ 130 #define FDCCMDADD_E (0x04) /* head settling flag */ 131 #define FDCCMDADD_P (0x02) /* precompensation off */ 132 #define FDCCMDADD_A0 (0x01) /* DAM flag */ 133 134 /* status register bits */ 135 136 #define FDCSTAT_MOTORON (0x80) /* motor on */ 137 #define FDCSTAT_WPROT (0x40) /* write protected (FDCCMD_WR*) */ 138 #define FDCSTAT_SPINUP (0x20) /* motor speed stable (Type I) */ 139 #define FDCSTAT_DELDAM (0x20) /* sector has deleted DAM (Type II+III) */ 140 #define FDCSTAT_RECNF (0x10) /* record not found */ 141 #define FDCSTAT_CRC (0x08) /* CRC error */ 142 #define FDCSTAT_TR00 (0x04) /* Track 00 flag (Type I) */ 143 #define FDCSTAT_LOST (0x04) /* Lost Data (Type II+III) */ 144 #define FDCSTAT_IDX (0x02) /* Index status (Type I) */ 145 #define FDCSTAT_DRQ (0x02) /* DRQ status (Type II+III) */ 146 #define FDCSTAT_BUSY (0x01) /* FDC is busy */ 147 148 149 /* PSG Port A Bit Nr 0 .. Side Sel .. 0 -> Side 1 1 -> Side 2 */ 150 #define DSKSIDE (0x01) 151 152 #define DSKDRVNONE (0x06) 153 #define DSKDRV0 (0x02) 154 #define DSKDRV1 (0x04) 155 156 /* step rates */ 157 #define FDCSTEP_6 0x00 158 #define FDCSTEP_12 0x01 159 #define FDCSTEP_2 0x02 160 #define FDCSTEP_3 0x03 161 162 struct atari_format_descr { 163 int track; /* to be formatted */ 164 int head; /* "" "" */ 165 int sect_offset; /* offset of first sector */ 166 }; 167 168 /* Disk types: DD, HD, ED */ 169 static struct atari_disk_type { 170 const char *name; 171 unsigned spt; /* sectors per track */ 172 unsigned blocks; /* total number of blocks */ 173 unsigned fdc_speed; /* fdc_speed setting */ 174 unsigned stretch; /* track doubling ? */ 175 } atari_disk_type[] = { 176 { "d360", 9, 720, 0, 0}, /* 0: 360kB diskette */ 177 { "D360", 9, 720, 0, 1}, /* 1: 360kb in 720k or 1.2MB drive */ 178 { "D720", 9,1440, 0, 0}, /* 2: 720kb in 720k or 1.2MB drive */ 179 { "D820", 10,1640, 0, 0}, /* 3: DD disk with 82 tracks/10 sectors */ 180 /* formats above are probed for type DD */ 181 #define MAX_TYPE_DD 3 182 { "h1200",15,2400, 3, 0}, /* 4: 1.2MB diskette */ 183 { "H1440",18,2880, 3, 0}, /* 5: 1.4 MB diskette (HD) */ 184 { "H1640",20,3280, 3, 0}, /* 6: 1.64MB diskette (fat HD) 82 tr 20 sec */ 185 /* formats above are probed for types DD and HD */ 186 #define MAX_TYPE_HD 6 187 { "E2880",36,5760, 3, 0}, /* 7: 2.8 MB diskette (ED) */ 188 { "E3280",40,6560, 3, 0}, /* 8: 3.2 MB diskette (fat ED) 82 tr 40 sec */ 189 /* formats above are probed for types DD, HD and ED */ 190 #define MAX_TYPE_ED 8 191 /* types below are never autoprobed */ 192 { "H1680",21,3360, 3, 0}, /* 9: 1.68MB diskette (fat HD) 80 tr 21 sec */ 193 { "h410",10,820, 0, 1}, /* 10: 410k diskette 41 tr 10 sec, stretch */ 194 { "h1476",18,2952, 3, 0}, /* 11: 1.48MB diskette 82 tr 18 sec */ 195 { "H1722",21,3444, 3, 0}, /* 12: 1.72MB diskette 82 tr 21 sec */ 196 { "h420",10,840, 0, 1}, /* 13: 420k diskette 42 tr 10 sec, stretch */ 197 { "H830",10,1660, 0, 0}, /* 14: 820k diskette 83 tr 10 sec */ 198 { "h1494",18,2952, 3, 0}, /* 15: 1.49MB diskette 83 tr 18 sec */ 199 { "H1743",21,3486, 3, 0}, /* 16: 1.74MB diskette 83 tr 21 sec */ 200 { "h880",11,1760, 0, 0}, /* 17: 880k diskette 80 tr 11 sec */ 201 { "D1040",13,2080, 0, 0}, /* 18: 1.04MB diskette 80 tr 13 sec */ 202 { "D1120",14,2240, 0, 0}, /* 19: 1.12MB diskette 80 tr 14 sec */ 203 { "h1600",20,3200, 3, 0}, /* 20: 1.60MB diskette 80 tr 20 sec */ 204 { "H1760",22,3520, 3, 0}, /* 21: 1.76MB diskette 80 tr 22 sec */ 205 { "H1920",24,3840, 3, 0}, /* 22: 1.92MB diskette 80 tr 24 sec */ 206 { "E3200",40,6400, 3, 0}, /* 23: 3.2MB diskette 80 tr 40 sec */ 207 { "E3520",44,7040, 3, 0}, /* 24: 3.52MB diskette 80 tr 44 sec */ 208 { "E3840",48,7680, 3, 0}, /* 25: 3.84MB diskette 80 tr 48 sec */ 209 { "H1840",23,3680, 3, 0}, /* 26: 1.84MB diskette 80 tr 23 sec */ 210 { "D800",10,1600, 0, 0}, /* 27: 800k diskette 80 tr 10 sec */ 211 }; 212 213 static int StartDiskType[] = { 214 MAX_TYPE_DD, 215 MAX_TYPE_HD, 216 MAX_TYPE_ED 217 }; 218 219 #define TYPE_DD 0 220 #define TYPE_HD 1 221 #define TYPE_ED 2 222 223 static int DriveType = TYPE_HD; 224 225 static DEFINE_SPINLOCK(ataflop_lock); 226 227 /* Array for translating minors into disk formats */ 228 static struct { 229 int index; 230 unsigned drive_types; 231 } minor2disktype[] = { 232 { 0, TYPE_DD }, /* 1: d360 */ 233 { 4, TYPE_HD }, /* 2: h1200 */ 234 { 1, TYPE_DD }, /* 3: D360 */ 235 { 2, TYPE_DD }, /* 4: D720 */ 236 { 1, TYPE_DD }, /* 5: h360 = D360 */ 237 { 2, TYPE_DD }, /* 6: h720 = D720 */ 238 { 5, TYPE_HD }, /* 7: H1440 */ 239 { 7, TYPE_ED }, /* 8: E2880 */ 240 /* some PC formats :-) */ 241 { 8, TYPE_ED }, /* 9: E3280 <- was "CompaQ" == E2880 for PC */ 242 { 5, TYPE_HD }, /* 10: h1440 = H1440 */ 243 { 9, TYPE_HD }, /* 11: H1680 */ 244 { 10, TYPE_DD }, /* 12: h410 */ 245 { 3, TYPE_DD }, /* 13: H820 <- == D820, 82x10 */ 246 { 11, TYPE_HD }, /* 14: h1476 */ 247 { 12, TYPE_HD }, /* 15: H1722 */ 248 { 13, TYPE_DD }, /* 16: h420 */ 249 { 14, TYPE_DD }, /* 17: H830 */ 250 { 15, TYPE_HD }, /* 18: h1494 */ 251 { 16, TYPE_HD }, /* 19: H1743 */ 252 { 17, TYPE_DD }, /* 20: h880 */ 253 { 18, TYPE_DD }, /* 21: D1040 */ 254 { 19, TYPE_DD }, /* 22: D1120 */ 255 { 20, TYPE_HD }, /* 23: h1600 */ 256 { 21, TYPE_HD }, /* 24: H1760 */ 257 { 22, TYPE_HD }, /* 25: H1920 */ 258 { 23, TYPE_ED }, /* 26: E3200 */ 259 { 24, TYPE_ED }, /* 27: E3520 */ 260 { 25, TYPE_ED }, /* 28: E3840 */ 261 { 26, TYPE_HD }, /* 29: H1840 */ 262 { 27, TYPE_DD }, /* 30: D800 */ 263 { 6, TYPE_HD }, /* 31: H1640 <- was H1600 == h1600 for PC */ 264 }; 265 266 #define NUM_DISK_MINORS ARRAY_SIZE(minor2disktype) 267 268 /* 269 * Maximum disk size (in kilobytes). This default is used whenever the 270 * current disk size is unknown. 271 */ 272 #define MAX_DISK_SIZE 3280 273 274 /* 275 * MSch: User-provided type information. 'drive' points to 276 * the respective entry of this array. Set by FDSETPRM ioctls. 277 */ 278 static struct atari_disk_type user_params[FD_MAX_UNITS]; 279 280 /* 281 * User-provided permanent type information. 'drive' points to 282 * the respective entry of this array. Set by FDDEFPRM ioctls, 283 * restored upon disk change by floppy_revalidate() if valid (as seen by 284 * default_params[].blocks > 0 - a bit in unit[].flags might be used for this?) 285 */ 286 static struct atari_disk_type default_params[FD_MAX_UNITS]; 287 288 /* current info on each unit */ 289 static struct atari_floppy_struct { 290 int connected; /* !=0 : drive is connected */ 291 int autoprobe; /* !=0 : do autoprobe */ 292 293 struct atari_disk_type *disktype; /* current type of disk */ 294 295 int track; /* current head position or -1 if 296 unknown */ 297 unsigned int steprate; /* steprate setting */ 298 unsigned int wpstat; /* current state of WP signal (for 299 disk change detection) */ 300 int flags; /* flags */ 301 struct gendisk *disk[NUM_DISK_MINORS]; 302 bool registered[NUM_DISK_MINORS]; 303 int ref; 304 int type; 305 struct blk_mq_tag_set tag_set; 306 int error_count; 307 } unit[FD_MAX_UNITS]; 308 309 #define UD unit[drive] 310 #define UDT unit[drive].disktype 311 #define SUD unit[SelectedDrive] 312 #define SUDT unit[SelectedDrive].disktype 313 314 315 #define FDC_READ(reg) ({ \ 316 /* unsigned long __flags; */ \ 317 unsigned short __val; \ 318 /* local_irq_save(__flags); */ \ 319 dma_wd.dma_mode_status = 0x80 | (reg); \ 320 udelay(25); \ 321 __val = dma_wd.fdc_acces_seccount; \ 322 MFPDELAY(); \ 323 /* local_irq_restore(__flags); */ \ 324 __val & 0xff; \ 325 }) 326 327 #define FDC_WRITE(reg,val) \ 328 do { \ 329 /* unsigned long __flags; */ \ 330 /* local_irq_save(__flags); */ \ 331 dma_wd.dma_mode_status = 0x80 | (reg); \ 332 udelay(25); \ 333 dma_wd.fdc_acces_seccount = (val); \ 334 MFPDELAY(); \ 335 /* local_irq_restore(__flags); */ \ 336 } while(0) 337 338 339 /* Buffering variables: 340 * First, there is a DMA buffer in ST-RAM that is used for floppy DMA 341 * operations. Second, a track buffer is used to cache a whole track 342 * of the disk to save read operations. These are two separate buffers 343 * because that allows write operations without clearing the track buffer. 344 */ 345 346 static int MaxSectors[] = { 347 11, 22, 44 348 }; 349 static int BufferSize[] = { 350 15*512, 30*512, 60*512 351 }; 352 353 #define BUFFER_SIZE (BufferSize[DriveType]) 354 355 unsigned char *DMABuffer; /* buffer for writes */ 356 static unsigned long PhysDMABuffer; /* physical address */ 357 358 static int UseTrackbuffer = -1; /* Do track buffering? */ 359 module_param(UseTrackbuffer, int, 0); 360 361 unsigned char *TrackBuffer; /* buffer for reads */ 362 static unsigned long PhysTrackBuffer; /* physical address */ 363 static int BufferDrive, BufferSide, BufferTrack; 364 static int read_track; /* non-zero if we are reading whole tracks */ 365 366 #define SECTOR_BUFFER(sec) (TrackBuffer + ((sec)-1)*512) 367 #define IS_BUFFERED(drive,side,track) \ 368 (BufferDrive == (drive) && BufferSide == (side) && BufferTrack == (track)) 369 370 /* 371 * These are global variables, as that's the easiest way to give 372 * information to interrupts. They are the data used for the current 373 * request. 374 */ 375 static int SelectedDrive = 0; 376 static int ReqCmd, ReqBlock; 377 static int ReqSide, ReqTrack, ReqSector, ReqCnt; 378 static int HeadSettleFlag = 0; 379 static unsigned char *ReqData, *ReqBuffer; 380 static int MotorOn = 0, MotorOffTrys; 381 static int IsFormatting = 0, FormatError; 382 383 static int UserSteprate[FD_MAX_UNITS] = { -1, -1 }; 384 module_param_array(UserSteprate, int, NULL, 0); 385 386 static DECLARE_COMPLETION(format_wait); 387 388 static unsigned long changed_floppies = 0xff, fake_change = 0; 389 #define CHECK_CHANGE_DELAY HZ/2 390 391 #define FD_MOTOR_OFF_DELAY (3*HZ) 392 #define FD_MOTOR_OFF_MAXTRY (10*20) 393 394 #define FLOPPY_TIMEOUT (6*HZ) 395 #define RECALIBRATE_ERRORS 4 /* After this many errors the drive 396 * will be recalibrated. */ 397 #define MAX_ERRORS 8 /* After this many errors the driver 398 * will give up. */ 399 400 401 /* 402 * The driver is trying to determine the correct media format 403 * while Probing is set. fd_rwsec_done() clears it after a 404 * successful access. 405 */ 406 static int Probing = 0; 407 408 /* This flag is set when a dummy seek is necessary to make the WP 409 * status bit accessible. 410 */ 411 static int NeedSeek = 0; 412 413 414 #ifdef DEBUG 415 #define DPRINT(a) printk a 416 #else 417 #define DPRINT(a) 418 #endif 419 420 /***************************** Prototypes *****************************/ 421 422 static void fd_select_side( int side ); 423 static void fd_select_drive( int drive ); 424 static void fd_deselect( void ); 425 static void fd_motor_off_timer(struct timer_list *unused); 426 static void check_change(struct timer_list *unused); 427 static irqreturn_t floppy_irq (int irq, void *dummy); 428 static void fd_error( void ); 429 static int do_format(int drive, int type, struct atari_format_descr *desc); 430 static void do_fd_action( int drive ); 431 static void fd_calibrate( void ); 432 static void fd_calibrate_done( int status ); 433 static void fd_seek( void ); 434 static void fd_seek_done( int status ); 435 static void fd_rwsec( void ); 436 static void fd_readtrack_check(struct timer_list *unused); 437 static void fd_rwsec_done( int status ); 438 static void fd_rwsec_done1(int status); 439 static void fd_writetrack( void ); 440 static void fd_writetrack_done( int status ); 441 static void fd_times_out(struct timer_list *unused); 442 static void finish_fdc( void ); 443 static void finish_fdc_done( int dummy ); 444 static void setup_req_params( int drive ); 445 static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int 446 cmd, unsigned long param); 447 static void fd_probe( int drive ); 448 static int fd_test_drive_present( int drive ); 449 static void config_types( void ); 450 static int floppy_open(struct block_device *bdev, fmode_t mode); 451 static void floppy_release(struct gendisk *disk, fmode_t mode); 452 453 /************************* End of Prototypes **************************/ 454 455 static DEFINE_TIMER(motor_off_timer, fd_motor_off_timer); 456 static DEFINE_TIMER(readtrack_timer, fd_readtrack_check); 457 static DEFINE_TIMER(timeout_timer, fd_times_out); 458 static DEFINE_TIMER(fd_timer, check_change); 459 460 static void fd_end_request_cur(blk_status_t err) 461 { 462 DPRINT(("fd_end_request_cur(), bytes %d of %d\n", 463 blk_rq_cur_bytes(fd_request), 464 blk_rq_bytes(fd_request))); 465 466 if (!blk_update_request(fd_request, err, 467 blk_rq_cur_bytes(fd_request))) { 468 DPRINT(("calling __blk_mq_end_request()\n")); 469 __blk_mq_end_request(fd_request, err); 470 fd_request = NULL; 471 } else { 472 /* requeue rest of request */ 473 DPRINT(("calling blk_mq_requeue_request()\n")); 474 blk_mq_requeue_request(fd_request, true); 475 fd_request = NULL; 476 } 477 } 478 479 static inline void start_motor_off_timer(void) 480 { 481 mod_timer(&motor_off_timer, jiffies + FD_MOTOR_OFF_DELAY); 482 MotorOffTrys = 0; 483 } 484 485 static inline void start_check_change_timer( void ) 486 { 487 mod_timer(&fd_timer, jiffies + CHECK_CHANGE_DELAY); 488 } 489 490 static inline void start_timeout(void) 491 { 492 mod_timer(&timeout_timer, jiffies + FLOPPY_TIMEOUT); 493 } 494 495 static inline void stop_timeout(void) 496 { 497 del_timer(&timeout_timer); 498 } 499 500 /* Select the side to use. */ 501 502 static void fd_select_side( int side ) 503 { 504 unsigned long flags; 505 506 /* protect against various other ints mucking around with the PSG */ 507 local_irq_save(flags); 508 509 sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */ 510 sound_ym.wd_data = (side == 0) ? sound_ym.rd_data_reg_sel | 0x01 : 511 sound_ym.rd_data_reg_sel & 0xfe; 512 513 local_irq_restore(flags); 514 } 515 516 517 /* Select a drive, update the FDC's track register and set the correct 518 * clock speed for this disk's type. 519 */ 520 521 static void fd_select_drive( int drive ) 522 { 523 unsigned long flags; 524 unsigned char tmp; 525 526 if (drive == SelectedDrive) 527 return; 528 529 /* protect against various other ints mucking around with the PSG */ 530 local_irq_save(flags); 531 sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */ 532 tmp = sound_ym.rd_data_reg_sel; 533 sound_ym.wd_data = (tmp | DSKDRVNONE) & ~(drive == 0 ? DSKDRV0 : DSKDRV1); 534 atari_dont_touch_floppy_select = 1; 535 local_irq_restore(flags); 536 537 /* restore track register to saved value */ 538 FDC_WRITE( FDCREG_TRACK, UD.track ); 539 udelay(25); 540 541 /* select 8/16 MHz */ 542 if (UDT) 543 if (ATARIHW_PRESENT(FDCSPEED)) 544 dma_wd.fdc_speed = UDT->fdc_speed; 545 546 SelectedDrive = drive; 547 } 548 549 550 /* Deselect both drives. */ 551 552 static void fd_deselect( void ) 553 { 554 unsigned long flags; 555 556 /* protect against various other ints mucking around with the PSG */ 557 local_irq_save(flags); 558 atari_dont_touch_floppy_select = 0; 559 sound_ym.rd_data_reg_sel=14; /* Select PSG Port A */ 560 sound_ym.wd_data = (sound_ym.rd_data_reg_sel | 561 (MACH_IS_FALCON ? 3 : 7)); /* no drives selected */ 562 /* On Falcon, the drive B select line is used on the printer port, so 563 * leave it alone... */ 564 SelectedDrive = -1; 565 local_irq_restore(flags); 566 } 567 568 569 /* This timer function deselects the drives when the FDC switched the 570 * motor off. The deselection cannot happen earlier because the FDC 571 * counts the index signals, which arrive only if one drive is selected. 572 */ 573 574 static void fd_motor_off_timer(struct timer_list *unused) 575 { 576 unsigned char status; 577 578 if (SelectedDrive < 0) 579 /* no drive selected, needn't deselect anyone */ 580 return; 581 582 if (stdma_islocked()) 583 goto retry; 584 585 status = FDC_READ( FDCREG_STATUS ); 586 587 if (!(status & 0x80)) { 588 /* motor already turned off by FDC -> deselect drives */ 589 MotorOn = 0; 590 fd_deselect(); 591 return; 592 } 593 /* not yet off, try again */ 594 595 retry: 596 /* Test again later; if tested too often, it seems there is no disk 597 * in the drive and the FDC will leave the motor on forever (or, 598 * at least until a disk is inserted). So we'll test only twice 599 * per second from then on... 600 */ 601 mod_timer(&motor_off_timer, 602 jiffies + (MotorOffTrys++ < FD_MOTOR_OFF_MAXTRY ? HZ/20 : HZ/2)); 603 } 604 605 606 /* This function is repeatedly called to detect disk changes (as good 607 * as possible) and keep track of the current state of the write protection. 608 */ 609 610 static void check_change(struct timer_list *unused) 611 { 612 static int drive = 0; 613 614 unsigned long flags; 615 unsigned char old_porta; 616 int stat; 617 618 if (++drive > 1 || !UD.connected) 619 drive = 0; 620 621 /* protect against various other ints mucking around with the PSG */ 622 local_irq_save(flags); 623 624 if (!stdma_islocked()) { 625 sound_ym.rd_data_reg_sel = 14; 626 old_porta = sound_ym.rd_data_reg_sel; 627 sound_ym.wd_data = (old_porta | DSKDRVNONE) & 628 ~(drive == 0 ? DSKDRV0 : DSKDRV1); 629 stat = !!(FDC_READ( FDCREG_STATUS ) & FDCSTAT_WPROT); 630 sound_ym.wd_data = old_porta; 631 632 if (stat != UD.wpstat) { 633 DPRINT(( "wpstat[%d] = %d\n", drive, stat )); 634 UD.wpstat = stat; 635 set_bit (drive, &changed_floppies); 636 } 637 } 638 local_irq_restore(flags); 639 640 start_check_change_timer(); 641 } 642 643 644 /* Handling of the Head Settling Flag: This flag should be set after each 645 * seek operation, because we don't use seeks with verify. 646 */ 647 648 static inline void set_head_settle_flag(void) 649 { 650 HeadSettleFlag = FDCCMDADD_E; 651 } 652 653 static inline int get_head_settle_flag(void) 654 { 655 int tmp = HeadSettleFlag; 656 HeadSettleFlag = 0; 657 return( tmp ); 658 } 659 660 static inline void copy_buffer(void *from, void *to) 661 { 662 ulong *p1 = (ulong *)from, *p2 = (ulong *)to; 663 int cnt; 664 665 for (cnt = 512/4; cnt; cnt--) 666 *p2++ = *p1++; 667 } 668 669 /* General Interrupt Handling */ 670 671 static void (*FloppyIRQHandler)( int status ) = NULL; 672 673 static irqreturn_t floppy_irq (int irq, void *dummy) 674 { 675 unsigned char status; 676 void (*handler)( int ); 677 678 handler = xchg(&FloppyIRQHandler, NULL); 679 680 if (handler) { 681 nop(); 682 status = FDC_READ( FDCREG_STATUS ); 683 DPRINT(("FDC irq, status = %02x handler = %08lx\n",status,(unsigned long)handler)); 684 handler( status ); 685 } 686 else { 687 DPRINT(("FDC irq, no handler\n")); 688 } 689 return IRQ_HANDLED; 690 } 691 692 693 /* Error handling: If some error happened, retry some times, then 694 * recalibrate, then try again, and fail after MAX_ERRORS. 695 */ 696 697 static void fd_error( void ) 698 { 699 if (IsFormatting) { 700 IsFormatting = 0; 701 FormatError = 1; 702 complete(&format_wait); 703 return; 704 } 705 706 if (!fd_request) 707 return; 708 709 unit[SelectedDrive].error_count++; 710 if (unit[SelectedDrive].error_count >= MAX_ERRORS) { 711 printk(KERN_ERR "fd%d: too many errors.\n", SelectedDrive ); 712 fd_end_request_cur(BLK_STS_IOERR); 713 finish_fdc(); 714 return; 715 } 716 else if (unit[SelectedDrive].error_count == RECALIBRATE_ERRORS) { 717 printk(KERN_WARNING "fd%d: recalibrating\n", SelectedDrive ); 718 if (SelectedDrive != -1) 719 SUD.track = -1; 720 } 721 /* need to re-run request to recalibrate */ 722 atari_disable_irq( IRQ_MFP_FDC ); 723 724 setup_req_params( SelectedDrive ); 725 do_fd_action( SelectedDrive ); 726 727 atari_enable_irq( IRQ_MFP_FDC ); 728 } 729 730 731 732 #define SET_IRQ_HANDLER(proc) do { FloppyIRQHandler = (proc); } while(0) 733 734 735 /* ---------- Formatting ---------- */ 736 737 #define FILL(n,val) \ 738 do { \ 739 memset( p, val, n ); \ 740 p += n; \ 741 } while(0) 742 743 static int do_format(int drive, int type, struct atari_format_descr *desc) 744 { 745 struct request_queue *q; 746 unsigned char *p; 747 int sect, nsect; 748 unsigned long flags; 749 int ret; 750 751 if (type) { 752 type--; 753 if (type >= NUM_DISK_MINORS || 754 minor2disktype[type].drive_types > DriveType) { 755 finish_fdc(); 756 return -EINVAL; 757 } 758 } 759 760 q = unit[drive].disk[type]->queue; 761 blk_mq_freeze_queue(q); 762 blk_mq_quiesce_queue(q); 763 764 local_irq_save(flags); 765 stdma_lock(floppy_irq, NULL); 766 atari_turnon_irq( IRQ_MFP_FDC ); /* should be already, just to be sure */ 767 local_irq_restore(flags); 768 769 if (type) { 770 type = minor2disktype[type].index; 771 UDT = &atari_disk_type[type]; 772 } 773 774 if (!UDT || desc->track >= UDT->blocks/UDT->spt/2 || desc->head >= 2) { 775 finish_fdc(); 776 ret = -EINVAL; 777 goto out; 778 } 779 780 nsect = UDT->spt; 781 p = TrackBuffer; 782 /* The track buffer is used for the raw track data, so its 783 contents become invalid! */ 784 BufferDrive = -1; 785 /* stop deselect timer */ 786 del_timer( &motor_off_timer ); 787 788 FILL( 60 * (nsect / 9), 0x4e ); 789 for( sect = 0; sect < nsect; ++sect ) { 790 FILL( 12, 0 ); 791 FILL( 3, 0xf5 ); 792 *p++ = 0xfe; 793 *p++ = desc->track; 794 *p++ = desc->head; 795 *p++ = (nsect + sect - desc->sect_offset) % nsect + 1; 796 *p++ = 2; 797 *p++ = 0xf7; 798 FILL( 22, 0x4e ); 799 FILL( 12, 0 ); 800 FILL( 3, 0xf5 ); 801 *p++ = 0xfb; 802 FILL( 512, 0xe5 ); 803 *p++ = 0xf7; 804 FILL( 40, 0x4e ); 805 } 806 FILL( TrackBuffer+BUFFER_SIZE-p, 0x4e ); 807 808 IsFormatting = 1; 809 FormatError = 0; 810 ReqTrack = desc->track; 811 ReqSide = desc->head; 812 do_fd_action( drive ); 813 814 wait_for_completion(&format_wait); 815 816 finish_fdc(); 817 ret = FormatError ? -EIO : 0; 818 out: 819 blk_mq_unquiesce_queue(q); 820 blk_mq_unfreeze_queue(q); 821 return ret; 822 } 823 824 825 /* do_fd_action() is the general procedure for a fd request: All 826 * required parameter settings (drive select, side select, track 827 * position) are checked and set if needed. For each of these 828 * parameters and the actual reading or writing exist two functions: 829 * one that starts the setting (or skips it if possible) and one 830 * callback for the "done" interrupt. Each done func calls the next 831 * set function to propagate the request down to fd_rwsec_done(). 832 */ 833 834 static void do_fd_action( int drive ) 835 { 836 DPRINT(("do_fd_action\n")); 837 838 if (UseTrackbuffer && !IsFormatting) { 839 repeat: 840 if (IS_BUFFERED( drive, ReqSide, ReqTrack )) { 841 if (ReqCmd == READ) { 842 copy_buffer( SECTOR_BUFFER(ReqSector), ReqData ); 843 if (++ReqCnt < blk_rq_cur_sectors(fd_request)) { 844 /* read next sector */ 845 setup_req_params( drive ); 846 goto repeat; 847 } 848 else { 849 /* all sectors finished */ 850 fd_end_request_cur(BLK_STS_OK); 851 finish_fdc(); 852 return; 853 } 854 } 855 else { 856 /* cmd == WRITE, pay attention to track buffer 857 * consistency! */ 858 copy_buffer( ReqData, SECTOR_BUFFER(ReqSector) ); 859 } 860 } 861 } 862 863 if (SelectedDrive != drive) 864 fd_select_drive( drive ); 865 866 if (UD.track == -1) 867 fd_calibrate(); 868 else if (UD.track != ReqTrack << UDT->stretch) 869 fd_seek(); 870 else if (IsFormatting) 871 fd_writetrack(); 872 else 873 fd_rwsec(); 874 } 875 876 877 /* Seek to track 0 if the current track is unknown */ 878 879 static void fd_calibrate( void ) 880 { 881 if (SUD.track >= 0) { 882 fd_calibrate_done( 0 ); 883 return; 884 } 885 886 if (ATARIHW_PRESENT(FDCSPEED)) 887 dma_wd.fdc_speed = 0; /* always seek with 8 Mhz */ 888 DPRINT(("fd_calibrate\n")); 889 SET_IRQ_HANDLER( fd_calibrate_done ); 890 /* we can't verify, since the speed may be incorrect */ 891 FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | SUD.steprate ); 892 893 NeedSeek = 1; 894 MotorOn = 1; 895 start_timeout(); 896 /* wait for IRQ */ 897 } 898 899 900 static void fd_calibrate_done( int status ) 901 { 902 DPRINT(("fd_calibrate_done()\n")); 903 stop_timeout(); 904 905 /* set the correct speed now */ 906 if (ATARIHW_PRESENT(FDCSPEED)) 907 dma_wd.fdc_speed = SUDT->fdc_speed; 908 if (status & FDCSTAT_RECNF) { 909 printk(KERN_ERR "fd%d: restore failed\n", SelectedDrive ); 910 fd_error(); 911 } 912 else { 913 SUD.track = 0; 914 fd_seek(); 915 } 916 } 917 918 919 /* Seek the drive to the requested track. The drive must have been 920 * calibrated at some point before this. 921 */ 922 923 static void fd_seek( void ) 924 { 925 if (SUD.track == ReqTrack << SUDT->stretch) { 926 fd_seek_done( 0 ); 927 return; 928 } 929 930 if (ATARIHW_PRESENT(FDCSPEED)) { 931 dma_wd.fdc_speed = 0; /* always seek witch 8 Mhz */ 932 MFPDELAY(); 933 } 934 935 DPRINT(("fd_seek() to track %d\n",ReqTrack)); 936 FDC_WRITE( FDCREG_DATA, ReqTrack << SUDT->stretch); 937 udelay(25); 938 SET_IRQ_HANDLER( fd_seek_done ); 939 FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK | SUD.steprate ); 940 941 MotorOn = 1; 942 set_head_settle_flag(); 943 start_timeout(); 944 /* wait for IRQ */ 945 } 946 947 948 static void fd_seek_done( int status ) 949 { 950 DPRINT(("fd_seek_done()\n")); 951 stop_timeout(); 952 953 /* set the correct speed */ 954 if (ATARIHW_PRESENT(FDCSPEED)) 955 dma_wd.fdc_speed = SUDT->fdc_speed; 956 if (status & FDCSTAT_RECNF) { 957 printk(KERN_ERR "fd%d: seek error (to track %d)\n", 958 SelectedDrive, ReqTrack ); 959 /* we don't know exactly which track we are on now! */ 960 SUD.track = -1; 961 fd_error(); 962 } 963 else { 964 SUD.track = ReqTrack << SUDT->stretch; 965 NeedSeek = 0; 966 if (IsFormatting) 967 fd_writetrack(); 968 else 969 fd_rwsec(); 970 } 971 } 972 973 974 /* This does the actual reading/writing after positioning the head 975 * over the correct track. 976 */ 977 978 static int MultReadInProgress = 0; 979 980 981 static void fd_rwsec( void ) 982 { 983 unsigned long paddr, flags; 984 unsigned int rwflag, old_motoron; 985 unsigned int track; 986 987 DPRINT(("fd_rwsec(), Sec=%d, Access=%c\n",ReqSector, ReqCmd == WRITE ? 'w' : 'r' )); 988 if (ReqCmd == WRITE) { 989 if (ATARIHW_PRESENT(EXTD_DMA)) { 990 paddr = virt_to_phys(ReqData); 991 } 992 else { 993 copy_buffer( ReqData, DMABuffer ); 994 paddr = PhysDMABuffer; 995 } 996 dma_cache_maintenance( paddr, 512, 1 ); 997 rwflag = 0x100; 998 } 999 else { 1000 if (read_track) 1001 paddr = PhysTrackBuffer; 1002 else 1003 paddr = ATARIHW_PRESENT(EXTD_DMA) ? 1004 virt_to_phys(ReqData) : PhysDMABuffer; 1005 rwflag = 0; 1006 } 1007 1008 fd_select_side( ReqSide ); 1009 1010 /* Start sector of this operation */ 1011 FDC_WRITE( FDCREG_SECTOR, read_track ? 1 : ReqSector ); 1012 MFPDELAY(); 1013 /* Cheat for track if stretch != 0 */ 1014 if (SUDT->stretch) { 1015 track = FDC_READ( FDCREG_TRACK); 1016 MFPDELAY(); 1017 FDC_WRITE( FDCREG_TRACK, track >> SUDT->stretch); 1018 } 1019 udelay(25); 1020 1021 /* Setup DMA */ 1022 local_irq_save(flags); 1023 dma_wd.dma_lo = (unsigned char)paddr; 1024 MFPDELAY(); 1025 paddr >>= 8; 1026 dma_wd.dma_md = (unsigned char)paddr; 1027 MFPDELAY(); 1028 paddr >>= 8; 1029 if (ATARIHW_PRESENT(EXTD_DMA)) 1030 st_dma_ext_dmahi = (unsigned short)paddr; 1031 else 1032 dma_wd.dma_hi = (unsigned char)paddr; 1033 MFPDELAY(); 1034 local_irq_restore(flags); 1035 1036 /* Clear FIFO and switch DMA to correct mode */ 1037 dma_wd.dma_mode_status = 0x90 | rwflag; 1038 MFPDELAY(); 1039 dma_wd.dma_mode_status = 0x90 | (rwflag ^ 0x100); 1040 MFPDELAY(); 1041 dma_wd.dma_mode_status = 0x90 | rwflag; 1042 MFPDELAY(); 1043 1044 /* How many sectors for DMA */ 1045 dma_wd.fdc_acces_seccount = read_track ? SUDT->spt : 1; 1046 1047 udelay(25); 1048 1049 /* Start operation */ 1050 dma_wd.dma_mode_status = FDCSELREG_STP | rwflag; 1051 udelay(25); 1052 SET_IRQ_HANDLER( fd_rwsec_done ); 1053 dma_wd.fdc_acces_seccount = 1054 (get_head_settle_flag() | 1055 (rwflag ? FDCCMD_WRSEC : (FDCCMD_RDSEC | (read_track ? FDCCMDADD_M : 0)))); 1056 1057 old_motoron = MotorOn; 1058 MotorOn = 1; 1059 NeedSeek = 1; 1060 /* wait for interrupt */ 1061 1062 if (read_track) { 1063 /* If reading a whole track, wait about one disk rotation and 1064 * then check if all sectors are read. The FDC will even 1065 * search for the first non-existent sector and need 1 sec to 1066 * recognise that it isn't present :-( 1067 */ 1068 MultReadInProgress = 1; 1069 mod_timer(&readtrack_timer, 1070 /* 1 rot. + 5 rot.s if motor was off */ 1071 jiffies + HZ/5 + (old_motoron ? 0 : HZ)); 1072 } 1073 start_timeout(); 1074 } 1075 1076 1077 static void fd_readtrack_check(struct timer_list *unused) 1078 { 1079 unsigned long flags, addr, addr2; 1080 1081 local_irq_save(flags); 1082 1083 if (!MultReadInProgress) { 1084 /* This prevents a race condition that could arise if the 1085 * interrupt is triggered while the calling of this timer 1086 * callback function takes place. The IRQ function then has 1087 * already cleared 'MultReadInProgress' when flow of control 1088 * gets here. 1089 */ 1090 local_irq_restore(flags); 1091 return; 1092 } 1093 1094 /* get the current DMA address */ 1095 /* ++ f.a. read twice to avoid being fooled by switcher */ 1096 addr = 0; 1097 do { 1098 addr2 = addr; 1099 addr = dma_wd.dma_lo & 0xff; 1100 MFPDELAY(); 1101 addr |= (dma_wd.dma_md & 0xff) << 8; 1102 MFPDELAY(); 1103 if (ATARIHW_PRESENT( EXTD_DMA )) 1104 addr |= (st_dma_ext_dmahi & 0xffff) << 16; 1105 else 1106 addr |= (dma_wd.dma_hi & 0xff) << 16; 1107 MFPDELAY(); 1108 } while(addr != addr2); 1109 1110 if (addr >= PhysTrackBuffer + SUDT->spt*512) { 1111 /* already read enough data, force an FDC interrupt to stop 1112 * the read operation 1113 */ 1114 SET_IRQ_HANDLER( NULL ); 1115 MultReadInProgress = 0; 1116 local_irq_restore(flags); 1117 DPRINT(("fd_readtrack_check(): done\n")); 1118 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI ); 1119 udelay(25); 1120 1121 /* No error until now -- the FDC would have interrupted 1122 * otherwise! 1123 */ 1124 fd_rwsec_done1(0); 1125 } 1126 else { 1127 /* not yet finished, wait another tenth rotation */ 1128 local_irq_restore(flags); 1129 DPRINT(("fd_readtrack_check(): not yet finished\n")); 1130 mod_timer(&readtrack_timer, jiffies + HZ/5/10); 1131 } 1132 } 1133 1134 1135 static void fd_rwsec_done( int status ) 1136 { 1137 DPRINT(("fd_rwsec_done()\n")); 1138 1139 if (read_track) { 1140 del_timer(&readtrack_timer); 1141 if (!MultReadInProgress) 1142 return; 1143 MultReadInProgress = 0; 1144 } 1145 fd_rwsec_done1(status); 1146 } 1147 1148 static void fd_rwsec_done1(int status) 1149 { 1150 unsigned int track; 1151 1152 stop_timeout(); 1153 1154 /* Correct the track if stretch != 0 */ 1155 if (SUDT->stretch) { 1156 track = FDC_READ( FDCREG_TRACK); 1157 MFPDELAY(); 1158 FDC_WRITE( FDCREG_TRACK, track << SUDT->stretch); 1159 } 1160 1161 if (!UseTrackbuffer) { 1162 dma_wd.dma_mode_status = 0x90; 1163 MFPDELAY(); 1164 if (!(dma_wd.dma_mode_status & 0x01)) { 1165 printk(KERN_ERR "fd%d: DMA error\n", SelectedDrive ); 1166 goto err_end; 1167 } 1168 } 1169 MFPDELAY(); 1170 1171 if (ReqCmd == WRITE && (status & FDCSTAT_WPROT)) { 1172 printk(KERN_NOTICE "fd%d: is write protected\n", SelectedDrive ); 1173 goto err_end; 1174 } 1175 if ((status & FDCSTAT_RECNF) && 1176 /* RECNF is no error after a multiple read when the FDC 1177 searched for a non-existent sector! */ 1178 !(read_track && FDC_READ(FDCREG_SECTOR) > SUDT->spt)) { 1179 if (Probing) { 1180 if (SUDT > atari_disk_type) { 1181 if (SUDT[-1].blocks > ReqBlock) { 1182 /* try another disk type */ 1183 SUDT--; 1184 set_capacity(unit[SelectedDrive].disk[0], 1185 SUDT->blocks); 1186 } else 1187 Probing = 0; 1188 } 1189 else { 1190 if (SUD.flags & FTD_MSG) 1191 printk(KERN_INFO "fd%d: Auto-detected floppy type %s\n", 1192 SelectedDrive, SUDT->name ); 1193 Probing=0; 1194 } 1195 } else { 1196 /* record not found, but not probing. Maybe stretch wrong ? Restart probing */ 1197 if (SUD.autoprobe) { 1198 SUDT = atari_disk_type + StartDiskType[DriveType]; 1199 set_capacity(unit[SelectedDrive].disk[0], 1200 SUDT->blocks); 1201 Probing = 1; 1202 } 1203 } 1204 if (Probing) { 1205 if (ATARIHW_PRESENT(FDCSPEED)) { 1206 dma_wd.fdc_speed = SUDT->fdc_speed; 1207 MFPDELAY(); 1208 } 1209 setup_req_params( SelectedDrive ); 1210 BufferDrive = -1; 1211 do_fd_action( SelectedDrive ); 1212 return; 1213 } 1214 1215 printk(KERN_ERR "fd%d: sector %d not found (side %d, track %d)\n", 1216 SelectedDrive, FDC_READ (FDCREG_SECTOR), ReqSide, ReqTrack ); 1217 goto err_end; 1218 } 1219 if (status & FDCSTAT_CRC) { 1220 printk(KERN_ERR "fd%d: CRC error (side %d, track %d, sector %d)\n", 1221 SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) ); 1222 goto err_end; 1223 } 1224 if (status & FDCSTAT_LOST) { 1225 printk(KERN_ERR "fd%d: lost data (side %d, track %d, sector %d)\n", 1226 SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) ); 1227 goto err_end; 1228 } 1229 1230 Probing = 0; 1231 1232 if (ReqCmd == READ) { 1233 if (!read_track) { 1234 void *addr; 1235 addr = ATARIHW_PRESENT( EXTD_DMA ) ? ReqData : DMABuffer; 1236 dma_cache_maintenance( virt_to_phys(addr), 512, 0 ); 1237 if (!ATARIHW_PRESENT( EXTD_DMA )) 1238 copy_buffer (addr, ReqData); 1239 } else { 1240 dma_cache_maintenance( PhysTrackBuffer, MaxSectors[DriveType] * 512, 0 ); 1241 BufferDrive = SelectedDrive; 1242 BufferSide = ReqSide; 1243 BufferTrack = ReqTrack; 1244 copy_buffer (SECTOR_BUFFER (ReqSector), ReqData); 1245 } 1246 } 1247 1248 if (++ReqCnt < blk_rq_cur_sectors(fd_request)) { 1249 /* read next sector */ 1250 setup_req_params( SelectedDrive ); 1251 do_fd_action( SelectedDrive ); 1252 } 1253 else { 1254 /* all sectors finished */ 1255 fd_end_request_cur(BLK_STS_OK); 1256 finish_fdc(); 1257 } 1258 return; 1259 1260 err_end: 1261 BufferDrive = -1; 1262 fd_error(); 1263 } 1264 1265 1266 static void fd_writetrack( void ) 1267 { 1268 unsigned long paddr, flags; 1269 unsigned int track; 1270 1271 DPRINT(("fd_writetrack() Tr=%d Si=%d\n", ReqTrack, ReqSide )); 1272 1273 paddr = PhysTrackBuffer; 1274 dma_cache_maintenance( paddr, BUFFER_SIZE, 1 ); 1275 1276 fd_select_side( ReqSide ); 1277 1278 /* Cheat for track if stretch != 0 */ 1279 if (SUDT->stretch) { 1280 track = FDC_READ( FDCREG_TRACK); 1281 MFPDELAY(); 1282 FDC_WRITE(FDCREG_TRACK,track >> SUDT->stretch); 1283 } 1284 udelay(40); 1285 1286 /* Setup DMA */ 1287 local_irq_save(flags); 1288 dma_wd.dma_lo = (unsigned char)paddr; 1289 MFPDELAY(); 1290 paddr >>= 8; 1291 dma_wd.dma_md = (unsigned char)paddr; 1292 MFPDELAY(); 1293 paddr >>= 8; 1294 if (ATARIHW_PRESENT( EXTD_DMA )) 1295 st_dma_ext_dmahi = (unsigned short)paddr; 1296 else 1297 dma_wd.dma_hi = (unsigned char)paddr; 1298 MFPDELAY(); 1299 local_irq_restore(flags); 1300 1301 /* Clear FIFO and switch DMA to correct mode */ 1302 dma_wd.dma_mode_status = 0x190; 1303 MFPDELAY(); 1304 dma_wd.dma_mode_status = 0x90; 1305 MFPDELAY(); 1306 dma_wd.dma_mode_status = 0x190; 1307 MFPDELAY(); 1308 1309 /* How many sectors for DMA */ 1310 dma_wd.fdc_acces_seccount = BUFFER_SIZE/512; 1311 udelay(40); 1312 1313 /* Start operation */ 1314 dma_wd.dma_mode_status = FDCSELREG_STP | 0x100; 1315 udelay(40); 1316 SET_IRQ_HANDLER( fd_writetrack_done ); 1317 dma_wd.fdc_acces_seccount = FDCCMD_WRTRA | get_head_settle_flag(); 1318 1319 MotorOn = 1; 1320 start_timeout(); 1321 /* wait for interrupt */ 1322 } 1323 1324 1325 static void fd_writetrack_done( int status ) 1326 { 1327 DPRINT(("fd_writetrack_done()\n")); 1328 1329 stop_timeout(); 1330 1331 if (status & FDCSTAT_WPROT) { 1332 printk(KERN_NOTICE "fd%d: is write protected\n", SelectedDrive ); 1333 goto err_end; 1334 } 1335 if (status & FDCSTAT_LOST) { 1336 printk(KERN_ERR "fd%d: lost data (side %d, track %d)\n", 1337 SelectedDrive, ReqSide, ReqTrack ); 1338 goto err_end; 1339 } 1340 1341 complete(&format_wait); 1342 return; 1343 1344 err_end: 1345 fd_error(); 1346 } 1347 1348 static void fd_times_out(struct timer_list *unused) 1349 { 1350 atari_disable_irq( IRQ_MFP_FDC ); 1351 if (!FloppyIRQHandler) goto end; /* int occurred after timer was fired, but 1352 * before we came here... */ 1353 1354 SET_IRQ_HANDLER( NULL ); 1355 /* If the timeout occurred while the readtrack_check timer was 1356 * active, we need to cancel it, else bad things will happen */ 1357 if (UseTrackbuffer) 1358 del_timer( &readtrack_timer ); 1359 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI ); 1360 udelay( 25 ); 1361 1362 printk(KERN_ERR "floppy timeout\n" ); 1363 fd_error(); 1364 end: 1365 atari_enable_irq( IRQ_MFP_FDC ); 1366 } 1367 1368 1369 /* The (noop) seek operation here is needed to make the WP bit in the 1370 * FDC status register accessible for check_change. If the last disk 1371 * operation would have been a RDSEC, this bit would always read as 0 1372 * no matter what :-( To save time, the seek goes to the track we're 1373 * already on. 1374 */ 1375 1376 static void finish_fdc( void ) 1377 { 1378 if (!NeedSeek || !stdma_is_locked_by(floppy_irq)) { 1379 finish_fdc_done( 0 ); 1380 } 1381 else { 1382 DPRINT(("finish_fdc: dummy seek started\n")); 1383 FDC_WRITE (FDCREG_DATA, SUD.track); 1384 SET_IRQ_HANDLER( finish_fdc_done ); 1385 FDC_WRITE (FDCREG_CMD, FDCCMD_SEEK); 1386 MotorOn = 1; 1387 start_timeout(); 1388 /* we must wait for the IRQ here, because the ST-DMA 1389 is released immediately afterwards and the interrupt 1390 may be delivered to the wrong driver. */ 1391 } 1392 } 1393 1394 1395 static void finish_fdc_done( int dummy ) 1396 { 1397 unsigned long flags; 1398 1399 DPRINT(("finish_fdc_done entered\n")); 1400 stop_timeout(); 1401 NeedSeek = 0; 1402 1403 if (timer_pending(&fd_timer) && time_before(fd_timer.expires, jiffies + 5)) 1404 /* If the check for a disk change is done too early after this 1405 * last seek command, the WP bit still reads wrong :-(( 1406 */ 1407 mod_timer(&fd_timer, jiffies + 5); 1408 else 1409 start_check_change_timer(); 1410 start_motor_off_timer(); 1411 1412 local_irq_save(flags); 1413 if (stdma_is_locked_by(floppy_irq)) 1414 stdma_release(); 1415 local_irq_restore(flags); 1416 1417 DPRINT(("finish_fdc() finished\n")); 1418 } 1419 1420 /* The detection of disk changes is a dark chapter in Atari history :-( 1421 * Because the "Drive ready" signal isn't present in the Atari 1422 * hardware, one has to rely on the "Write Protect". This works fine, 1423 * as long as no write protected disks are used. TOS solves this 1424 * problem by introducing tri-state logic ("maybe changed") and 1425 * looking at the serial number in block 0. This isn't possible for 1426 * Linux, since the floppy driver can't make assumptions about the 1427 * filesystem used on the disk and thus the contents of block 0. I've 1428 * chosen the method to always say "The disk was changed" if it is 1429 * unsure whether it was. This implies that every open or mount 1430 * invalidates the disk buffers if you work with write protected 1431 * disks. But at least this is better than working with incorrect data 1432 * due to unrecognised disk changes. 1433 */ 1434 1435 static unsigned int floppy_check_events(struct gendisk *disk, 1436 unsigned int clearing) 1437 { 1438 struct atari_floppy_struct *p = disk->private_data; 1439 unsigned int drive = p - unit; 1440 if (test_bit (drive, &fake_change)) { 1441 /* simulated change (e.g. after formatting) */ 1442 return DISK_EVENT_MEDIA_CHANGE; 1443 } 1444 if (test_bit (drive, &changed_floppies)) { 1445 /* surely changed (the WP signal changed at least once) */ 1446 return DISK_EVENT_MEDIA_CHANGE; 1447 } 1448 if (UD.wpstat) { 1449 /* WP is on -> could be changed: to be sure, buffers should be 1450 * invalidated... 1451 */ 1452 return DISK_EVENT_MEDIA_CHANGE; 1453 } 1454 1455 return 0; 1456 } 1457 1458 static int floppy_revalidate(struct gendisk *disk) 1459 { 1460 struct atari_floppy_struct *p = disk->private_data; 1461 unsigned int drive = p - unit; 1462 1463 if (test_bit(drive, &changed_floppies) || 1464 test_bit(drive, &fake_change) || !p->disktype) { 1465 if (UD.flags & FTD_MSG) 1466 printk(KERN_ERR "floppy: clear format %p!\n", UDT); 1467 BufferDrive = -1; 1468 clear_bit(drive, &fake_change); 1469 clear_bit(drive, &changed_floppies); 1470 /* MSch: clearing geometry makes sense only for autoprobe 1471 formats, for 'permanent user-defined' parameter: 1472 restore default_params[] here if flagged valid! */ 1473 if (default_params[drive].blocks == 0) 1474 UDT = NULL; 1475 else 1476 UDT = &default_params[drive]; 1477 } 1478 return 0; 1479 } 1480 1481 1482 /* This sets up the global variables describing the current request. */ 1483 1484 static void setup_req_params( int drive ) 1485 { 1486 int block = ReqBlock + ReqCnt; 1487 1488 ReqTrack = block / UDT->spt; 1489 ReqSector = block - ReqTrack * UDT->spt + 1; 1490 ReqSide = ReqTrack & 1; 1491 ReqTrack >>= 1; 1492 ReqData = ReqBuffer + 512 * ReqCnt; 1493 1494 if (UseTrackbuffer) 1495 read_track = (ReqCmd == READ && unit[drive].error_count == 0); 1496 else 1497 read_track = 0; 1498 1499 DPRINT(("Request params: Si=%d Tr=%d Se=%d Data=%08lx\n",ReqSide, 1500 ReqTrack, ReqSector, (unsigned long)ReqData )); 1501 } 1502 1503 static blk_status_t ataflop_queue_rq(struct blk_mq_hw_ctx *hctx, 1504 const struct blk_mq_queue_data *bd) 1505 { 1506 struct atari_floppy_struct *floppy = bd->rq->q->disk->private_data; 1507 int drive = floppy - unit; 1508 int type = floppy->type; 1509 1510 DPRINT(("Queue request: drive %d type %d sectors %d of %d last %d\n", 1511 drive, type, blk_rq_cur_sectors(bd->rq), 1512 blk_rq_sectors(bd->rq), bd->last)); 1513 1514 spin_lock_irq(&ataflop_lock); 1515 if (fd_request) { 1516 spin_unlock_irq(&ataflop_lock); 1517 return BLK_STS_DEV_RESOURCE; 1518 } 1519 if (!stdma_try_lock(floppy_irq, NULL)) { 1520 spin_unlock_irq(&ataflop_lock); 1521 return BLK_STS_RESOURCE; 1522 } 1523 fd_request = bd->rq; 1524 unit[drive].error_count = 0; 1525 blk_mq_start_request(fd_request); 1526 1527 atari_disable_irq( IRQ_MFP_FDC ); 1528 1529 IsFormatting = 0; 1530 1531 if (!UD.connected) { 1532 /* drive not connected */ 1533 printk(KERN_ERR "Unknown Device: fd%d\n", drive ); 1534 fd_end_request_cur(BLK_STS_IOERR); 1535 stdma_release(); 1536 goto out; 1537 } 1538 1539 if (type == 0) { 1540 if (!UDT) { 1541 Probing = 1; 1542 UDT = atari_disk_type + StartDiskType[DriveType]; 1543 set_capacity(bd->rq->q->disk, UDT->blocks); 1544 UD.autoprobe = 1; 1545 } 1546 } 1547 else { 1548 /* user supplied disk type */ 1549 if (--type >= NUM_DISK_MINORS) { 1550 printk(KERN_WARNING "fd%d: invalid disk format", drive ); 1551 fd_end_request_cur(BLK_STS_IOERR); 1552 stdma_release(); 1553 goto out; 1554 } 1555 if (minor2disktype[type].drive_types > DriveType) { 1556 printk(KERN_WARNING "fd%d: unsupported disk format", drive ); 1557 fd_end_request_cur(BLK_STS_IOERR); 1558 stdma_release(); 1559 goto out; 1560 } 1561 type = minor2disktype[type].index; 1562 UDT = &atari_disk_type[type]; 1563 set_capacity(bd->rq->q->disk, UDT->blocks); 1564 UD.autoprobe = 0; 1565 } 1566 1567 /* stop deselect timer */ 1568 del_timer( &motor_off_timer ); 1569 1570 ReqCnt = 0; 1571 ReqCmd = rq_data_dir(fd_request); 1572 ReqBlock = blk_rq_pos(fd_request); 1573 ReqBuffer = bio_data(fd_request->bio); 1574 setup_req_params( drive ); 1575 do_fd_action( drive ); 1576 1577 atari_enable_irq( IRQ_MFP_FDC ); 1578 1579 out: 1580 spin_unlock_irq(&ataflop_lock); 1581 return BLK_STS_OK; 1582 } 1583 1584 static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, 1585 unsigned int cmd, unsigned long param) 1586 { 1587 struct gendisk *disk = bdev->bd_disk; 1588 struct atari_floppy_struct *floppy = disk->private_data; 1589 int drive = floppy - unit; 1590 int type = floppy->type; 1591 struct atari_format_descr fmt_desc; 1592 struct atari_disk_type *dtp; 1593 struct floppy_struct getprm; 1594 int settype; 1595 struct floppy_struct setprm; 1596 void __user *argp = (void __user *)param; 1597 1598 switch (cmd) { 1599 case FDGETPRM: 1600 if (type) { 1601 if (--type >= NUM_DISK_MINORS) 1602 return -ENODEV; 1603 if (minor2disktype[type].drive_types > DriveType) 1604 return -ENODEV; 1605 type = minor2disktype[type].index; 1606 dtp = &atari_disk_type[type]; 1607 if (UD.flags & FTD_MSG) 1608 printk (KERN_ERR "floppy%d: found dtp %p name %s!\n", 1609 drive, dtp, dtp->name); 1610 } 1611 else { 1612 if (!UDT) 1613 return -ENXIO; 1614 else 1615 dtp = UDT; 1616 } 1617 memset((void *)&getprm, 0, sizeof(getprm)); 1618 getprm.size = dtp->blocks; 1619 getprm.sect = dtp->spt; 1620 getprm.head = 2; 1621 getprm.track = dtp->blocks/dtp->spt/2; 1622 getprm.stretch = dtp->stretch; 1623 if (copy_to_user(argp, &getprm, sizeof(getprm))) 1624 return -EFAULT; 1625 return 0; 1626 } 1627 switch (cmd) { 1628 case FDSETPRM: 1629 case FDDEFPRM: 1630 /* 1631 * MSch 7/96: simple 'set geometry' case: just set the 1632 * 'default' device params (minor == 0). 1633 * Currently, the drive geometry is cleared after each 1634 * disk change and subsequent revalidate()! simple 1635 * implementation of FDDEFPRM: save geometry from a 1636 * FDDEFPRM call and restore it in floppy_revalidate() ! 1637 */ 1638 1639 /* get the parameters from user space */ 1640 if (floppy->ref != 1 && floppy->ref != -1) 1641 return -EBUSY; 1642 if (copy_from_user(&setprm, argp, sizeof(setprm))) 1643 return -EFAULT; 1644 /* 1645 * first of all: check for floppy change and revalidate, 1646 * or the next access will revalidate - and clear UDT :-( 1647 */ 1648 1649 if (floppy_check_events(disk, 0)) 1650 floppy_revalidate(disk); 1651 1652 if (UD.flags & FTD_MSG) 1653 printk (KERN_INFO "floppy%d: setting size %d spt %d str %d!\n", 1654 drive, setprm.size, setprm.sect, setprm.stretch); 1655 1656 /* what if type > 0 here? Overwrite specified entry ? */ 1657 if (type) { 1658 /* refuse to re-set a predefined type for now */ 1659 finish_fdc(); 1660 return -EINVAL; 1661 } 1662 1663 /* 1664 * type == 0: first look for a matching entry in the type list, 1665 * and set the UD.disktype field to use the perdefined entry. 1666 * TODO: add user-defined format to head of autoprobe list ? 1667 * Useful to include the user-type for future autodetection! 1668 */ 1669 1670 for (settype = 0; settype < NUM_DISK_MINORS; settype++) { 1671 int setidx = 0; 1672 if (minor2disktype[settype].drive_types > DriveType) { 1673 /* skip this one, invalid for drive ... */ 1674 continue; 1675 } 1676 setidx = minor2disktype[settype].index; 1677 dtp = &atari_disk_type[setidx]; 1678 1679 /* found matching entry ?? */ 1680 if ( dtp->blocks == setprm.size 1681 && dtp->spt == setprm.sect 1682 && dtp->stretch == setprm.stretch ) { 1683 if (UD.flags & FTD_MSG) 1684 printk (KERN_INFO "floppy%d: setting %s %p!\n", 1685 drive, dtp->name, dtp); 1686 UDT = dtp; 1687 set_capacity(disk, UDT->blocks); 1688 1689 if (cmd == FDDEFPRM) { 1690 /* save settings as permanent default type */ 1691 default_params[drive].name = dtp->name; 1692 default_params[drive].spt = dtp->spt; 1693 default_params[drive].blocks = dtp->blocks; 1694 default_params[drive].fdc_speed = dtp->fdc_speed; 1695 default_params[drive].stretch = dtp->stretch; 1696 } 1697 1698 return 0; 1699 } 1700 1701 } 1702 1703 /* no matching disk type found above - setting user_params */ 1704 1705 if (cmd == FDDEFPRM) { 1706 /* set permanent type */ 1707 dtp = &default_params[drive]; 1708 } else 1709 /* set user type (reset by disk change!) */ 1710 dtp = &user_params[drive]; 1711 1712 dtp->name = "user format"; 1713 dtp->blocks = setprm.size; 1714 dtp->spt = setprm.sect; 1715 if (setprm.sect > 14) 1716 dtp->fdc_speed = 3; 1717 else 1718 dtp->fdc_speed = 0; 1719 dtp->stretch = setprm.stretch; 1720 1721 if (UD.flags & FTD_MSG) 1722 printk (KERN_INFO "floppy%d: blk %d spt %d str %d!\n", 1723 drive, dtp->blocks, dtp->spt, dtp->stretch); 1724 1725 /* sanity check */ 1726 if (setprm.track != dtp->blocks/dtp->spt/2 || 1727 setprm.head != 2) { 1728 finish_fdc(); 1729 return -EINVAL; 1730 } 1731 1732 UDT = dtp; 1733 set_capacity(disk, UDT->blocks); 1734 1735 return 0; 1736 case FDMSGON: 1737 UD.flags |= FTD_MSG; 1738 return 0; 1739 case FDMSGOFF: 1740 UD.flags &= ~FTD_MSG; 1741 return 0; 1742 case FDSETEMSGTRESH: 1743 return -EINVAL; 1744 case FDFMTBEG: 1745 return 0; 1746 case FDFMTTRK: 1747 if (floppy->ref != 1 && floppy->ref != -1) 1748 return -EBUSY; 1749 if (copy_from_user(&fmt_desc, argp, sizeof(fmt_desc))) 1750 return -EFAULT; 1751 return do_format(drive, type, &fmt_desc); 1752 case FDCLRPRM: 1753 UDT = NULL; 1754 /* MSch: invalidate default_params */ 1755 default_params[drive].blocks = 0; 1756 set_capacity(disk, MAX_DISK_SIZE * 2); 1757 fallthrough; 1758 case FDFMTEND: 1759 case FDFLUSH: 1760 /* invalidate the buffer track to force a reread */ 1761 BufferDrive = -1; 1762 set_bit(drive, &fake_change); 1763 if (bdev_check_media_change(bdev)) 1764 floppy_revalidate(bdev->bd_disk); 1765 return 0; 1766 default: 1767 return -EINVAL; 1768 } 1769 } 1770 1771 static int fd_ioctl(struct block_device *bdev, fmode_t mode, 1772 unsigned int cmd, unsigned long arg) 1773 { 1774 int ret; 1775 1776 mutex_lock(&ataflop_mutex); 1777 ret = fd_locked_ioctl(bdev, mode, cmd, arg); 1778 mutex_unlock(&ataflop_mutex); 1779 1780 return ret; 1781 } 1782 1783 /* Initialize the 'unit' variable for drive 'drive' */ 1784 1785 static void __init fd_probe( int drive ) 1786 { 1787 UD.connected = 0; 1788 UDT = NULL; 1789 1790 if (!fd_test_drive_present( drive )) 1791 return; 1792 1793 UD.connected = 1; 1794 UD.track = 0; 1795 switch( UserSteprate[drive] ) { 1796 case 2: 1797 UD.steprate = FDCSTEP_2; 1798 break; 1799 case 3: 1800 UD.steprate = FDCSTEP_3; 1801 break; 1802 case 6: 1803 UD.steprate = FDCSTEP_6; 1804 break; 1805 case 12: 1806 UD.steprate = FDCSTEP_12; 1807 break; 1808 default: /* should be -1 for "not set by user" */ 1809 if (ATARIHW_PRESENT( FDCSPEED ) || MACH_IS_MEDUSA) 1810 UD.steprate = FDCSTEP_3; 1811 else 1812 UD.steprate = FDCSTEP_6; 1813 break; 1814 } 1815 MotorOn = 1; /* from probe restore operation! */ 1816 } 1817 1818 1819 /* This function tests the physical presence of a floppy drive (not 1820 * whether a disk is inserted). This is done by issuing a restore 1821 * command, waiting max. 2 seconds (that should be enough to move the 1822 * head across the whole disk) and looking at the state of the "TR00" 1823 * signal. This should now be raised if there is a drive connected 1824 * (and there is no hardware failure :-) Otherwise, the drive is 1825 * declared absent. 1826 */ 1827 1828 static int __init fd_test_drive_present( int drive ) 1829 { 1830 unsigned long timeout; 1831 unsigned char status; 1832 int ok; 1833 1834 if (drive >= (MACH_IS_FALCON ? 1 : 2)) return( 0 ); 1835 fd_select_drive( drive ); 1836 1837 /* disable interrupt temporarily */ 1838 atari_turnoff_irq( IRQ_MFP_FDC ); 1839 FDC_WRITE (FDCREG_TRACK, 0xff00); 1840 FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | FDCCMDADD_H | FDCSTEP_6 ); 1841 1842 timeout = jiffies + 2*HZ+HZ/2; 1843 while (time_before(jiffies, timeout)) 1844 if (!(st_mfp.par_dt_reg & 0x20)) 1845 break; 1846 1847 status = FDC_READ( FDCREG_STATUS ); 1848 ok = (status & FDCSTAT_TR00) != 0; 1849 1850 /* force interrupt to abort restore operation (FDC would try 1851 * about 50 seconds!) */ 1852 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI ); 1853 udelay(500); 1854 status = FDC_READ( FDCREG_STATUS ); 1855 udelay(20); 1856 1857 if (ok) { 1858 /* dummy seek command to make WP bit accessible */ 1859 FDC_WRITE( FDCREG_DATA, 0 ); 1860 FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK ); 1861 while( st_mfp.par_dt_reg & 0x20 ) 1862 ; 1863 status = FDC_READ( FDCREG_STATUS ); 1864 } 1865 1866 atari_turnon_irq( IRQ_MFP_FDC ); 1867 return( ok ); 1868 } 1869 1870 1871 /* Look how many and which kind of drives are connected. If there are 1872 * floppies, additionally start the disk-change and motor-off timers. 1873 */ 1874 1875 static void __init config_types( void ) 1876 { 1877 int drive, cnt = 0; 1878 1879 /* for probing drives, set the FDC speed to 8 MHz */ 1880 if (ATARIHW_PRESENT(FDCSPEED)) 1881 dma_wd.fdc_speed = 0; 1882 1883 printk(KERN_INFO "Probing floppy drive(s):\n"); 1884 for( drive = 0; drive < FD_MAX_UNITS; drive++ ) { 1885 fd_probe( drive ); 1886 if (UD.connected) { 1887 printk(KERN_INFO "fd%d\n", drive); 1888 ++cnt; 1889 } 1890 } 1891 1892 if (FDC_READ( FDCREG_STATUS ) & FDCSTAT_BUSY) { 1893 /* If FDC is still busy from probing, give it another FORCI 1894 * command to abort the operation. If this isn't done, the FDC 1895 * will interrupt later and its IRQ line stays low, because 1896 * the status register isn't read. And this will block any 1897 * interrupts on this IRQ line :-( 1898 */ 1899 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI ); 1900 udelay(500); 1901 FDC_READ( FDCREG_STATUS ); 1902 udelay(20); 1903 } 1904 1905 if (cnt > 0) { 1906 start_motor_off_timer(); 1907 if (cnt == 1) fd_select_drive( 0 ); 1908 start_check_change_timer(); 1909 } 1910 } 1911 1912 /* 1913 * floppy_open check for aliasing (/dev/fd0 can be the same as 1914 * /dev/PS0 etc), and disallows simultaneous access to the same 1915 * drive with different device numbers. 1916 */ 1917 1918 static int floppy_open(struct block_device *bdev, fmode_t mode) 1919 { 1920 struct atari_floppy_struct *p = bdev->bd_disk->private_data; 1921 int type = MINOR(bdev->bd_dev) >> 2; 1922 1923 DPRINT(("fd_open: type=%d\n",type)); 1924 if (p->ref && p->type != type) 1925 return -EBUSY; 1926 1927 if (p->ref == -1 || (p->ref && mode & FMODE_EXCL)) 1928 return -EBUSY; 1929 1930 if (mode & FMODE_EXCL) 1931 p->ref = -1; 1932 else 1933 p->ref++; 1934 1935 p->type = type; 1936 1937 if (mode & FMODE_NDELAY) 1938 return 0; 1939 1940 if (mode & (FMODE_READ|FMODE_WRITE)) { 1941 if (bdev_check_media_change(bdev)) 1942 floppy_revalidate(bdev->bd_disk); 1943 if (mode & FMODE_WRITE) { 1944 if (p->wpstat) { 1945 if (p->ref < 0) 1946 p->ref = 0; 1947 else 1948 p->ref--; 1949 return -EROFS; 1950 } 1951 } 1952 } 1953 return 0; 1954 } 1955 1956 static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode) 1957 { 1958 int ret; 1959 1960 mutex_lock(&ataflop_mutex); 1961 ret = floppy_open(bdev, mode); 1962 mutex_unlock(&ataflop_mutex); 1963 1964 return ret; 1965 } 1966 1967 static void floppy_release(struct gendisk *disk, fmode_t mode) 1968 { 1969 struct atari_floppy_struct *p = disk->private_data; 1970 mutex_lock(&ataflop_mutex); 1971 if (p->ref < 0) 1972 p->ref = 0; 1973 else if (!p->ref--) { 1974 printk(KERN_ERR "floppy_release with fd_ref == 0"); 1975 p->ref = 0; 1976 } 1977 mutex_unlock(&ataflop_mutex); 1978 } 1979 1980 static const struct block_device_operations floppy_fops = { 1981 .owner = THIS_MODULE, 1982 .open = floppy_unlocked_open, 1983 .release = floppy_release, 1984 .ioctl = fd_ioctl, 1985 .check_events = floppy_check_events, 1986 }; 1987 1988 static const struct blk_mq_ops ataflop_mq_ops = { 1989 .queue_rq = ataflop_queue_rq, 1990 }; 1991 1992 static int ataflop_alloc_disk(unsigned int drive, unsigned int type) 1993 { 1994 struct gendisk *disk; 1995 1996 disk = blk_mq_alloc_disk(&unit[drive].tag_set, NULL); 1997 if (IS_ERR(disk)) 1998 return PTR_ERR(disk); 1999 2000 disk->major = FLOPPY_MAJOR; 2001 disk->first_minor = drive + (type << 2); 2002 disk->minors = 1; 2003 sprintf(disk->disk_name, "fd%d", drive); 2004 disk->fops = &floppy_fops; 2005 disk->flags |= GENHD_FL_NO_PART; 2006 disk->events = DISK_EVENT_MEDIA_CHANGE; 2007 disk->private_data = &unit[drive]; 2008 set_capacity(disk, MAX_DISK_SIZE * 2); 2009 2010 unit[drive].disk[type] = disk; 2011 return 0; 2012 } 2013 2014 static void ataflop_probe(dev_t dev) 2015 { 2016 int drive = MINOR(dev) & 3; 2017 int type = MINOR(dev) >> 2; 2018 2019 if (type) 2020 type--; 2021 2022 if (drive >= FD_MAX_UNITS || type >= NUM_DISK_MINORS) 2023 return; 2024 if (unit[drive].disk[type]) 2025 return; 2026 if (ataflop_alloc_disk(drive, type)) 2027 return; 2028 if (add_disk(unit[drive].disk[type])) 2029 goto cleanup_disk; 2030 unit[drive].registered[type] = true; 2031 return; 2032 2033 cleanup_disk: 2034 put_disk(unit[drive].disk[type]); 2035 unit[drive].disk[type] = NULL; 2036 } 2037 2038 static void atari_floppy_cleanup(void) 2039 { 2040 int i; 2041 int type; 2042 2043 for (i = 0; i < FD_MAX_UNITS; i++) { 2044 for (type = 0; type < NUM_DISK_MINORS; type++) { 2045 if (!unit[i].disk[type]) 2046 continue; 2047 del_gendisk(unit[i].disk[type]); 2048 put_disk(unit[i].disk[type]); 2049 } 2050 blk_mq_free_tag_set(&unit[i].tag_set); 2051 } 2052 2053 del_timer_sync(&fd_timer); 2054 atari_stram_free(DMABuffer); 2055 } 2056 2057 static void atari_cleanup_floppy_disk(struct atari_floppy_struct *fs) 2058 { 2059 int type; 2060 2061 for (type = 0; type < NUM_DISK_MINORS; type++) { 2062 if (!fs->disk[type]) 2063 continue; 2064 if (fs->registered[type]) 2065 del_gendisk(fs->disk[type]); 2066 put_disk(fs->disk[type]); 2067 } 2068 blk_mq_free_tag_set(&fs->tag_set); 2069 } 2070 2071 static int __init atari_floppy_init (void) 2072 { 2073 int i; 2074 int ret; 2075 2076 if (!MACH_IS_ATARI) 2077 /* Amiga, Mac, ... don't have Atari-compatible floppy :-) */ 2078 return -ENODEV; 2079 2080 for (i = 0; i < FD_MAX_UNITS; i++) { 2081 memset(&unit[i].tag_set, 0, sizeof(unit[i].tag_set)); 2082 unit[i].tag_set.ops = &ataflop_mq_ops; 2083 unit[i].tag_set.nr_hw_queues = 1; 2084 unit[i].tag_set.nr_maps = 1; 2085 unit[i].tag_set.queue_depth = 2; 2086 unit[i].tag_set.numa_node = NUMA_NO_NODE; 2087 unit[i].tag_set.flags = BLK_MQ_F_SHOULD_MERGE; 2088 ret = blk_mq_alloc_tag_set(&unit[i].tag_set); 2089 if (ret) 2090 goto err; 2091 2092 ret = ataflop_alloc_disk(i, 0); 2093 if (ret) { 2094 blk_mq_free_tag_set(&unit[i].tag_set); 2095 goto err; 2096 } 2097 } 2098 2099 if (UseTrackbuffer < 0) 2100 /* not set by user -> use default: for now, we turn 2101 track buffering off for all Medusas, though it 2102 could be used with ones that have a counter 2103 card. But the test is too hard :-( */ 2104 UseTrackbuffer = !MACH_IS_MEDUSA; 2105 2106 /* initialize variables */ 2107 SelectedDrive = -1; 2108 BufferDrive = -1; 2109 2110 DMABuffer = atari_stram_alloc(BUFFER_SIZE+512, "ataflop"); 2111 if (!DMABuffer) { 2112 printk(KERN_ERR "atari_floppy_init: cannot get dma buffer\n"); 2113 ret = -ENOMEM; 2114 goto err; 2115 } 2116 TrackBuffer = DMABuffer + 512; 2117 PhysDMABuffer = atari_stram_to_phys(DMABuffer); 2118 PhysTrackBuffer = virt_to_phys(TrackBuffer); 2119 BufferDrive = BufferSide = BufferTrack = -1; 2120 2121 for (i = 0; i < FD_MAX_UNITS; i++) { 2122 unit[i].track = -1; 2123 unit[i].flags = 0; 2124 ret = add_disk(unit[i].disk[0]); 2125 if (ret) 2126 goto err_out_dma; 2127 unit[i].registered[0] = true; 2128 } 2129 2130 printk(KERN_INFO "Atari floppy driver: max. %cD, %strack buffering\n", 2131 DriveType == 0 ? 'D' : DriveType == 1 ? 'H' : 'E', 2132 UseTrackbuffer ? "" : "no "); 2133 config_types(); 2134 2135 ret = __register_blkdev(FLOPPY_MAJOR, "fd", ataflop_probe); 2136 if (ret) { 2137 printk(KERN_ERR "atari_floppy_init: cannot register block device\n"); 2138 atari_floppy_cleanup(); 2139 } 2140 return ret; 2141 2142 err_out_dma: 2143 atari_stram_free(DMABuffer); 2144 err: 2145 while (--i >= 0) 2146 atari_cleanup_floppy_disk(&unit[i]); 2147 2148 return ret; 2149 } 2150 2151 #ifndef MODULE 2152 static int __init atari_floppy_setup(char *str) 2153 { 2154 int ints[3 + FD_MAX_UNITS]; 2155 int i; 2156 2157 if (!MACH_IS_ATARI) 2158 return 0; 2159 2160 str = get_options(str, 3 + FD_MAX_UNITS, ints); 2161 2162 if (ints[0] < 1) { 2163 printk(KERN_ERR "ataflop_setup: no arguments!\n" ); 2164 return 0; 2165 } 2166 else if (ints[0] > 2+FD_MAX_UNITS) { 2167 printk(KERN_ERR "ataflop_setup: too many arguments\n" ); 2168 } 2169 2170 if (ints[1] < 0 || ints[1] > 2) 2171 printk(KERN_ERR "ataflop_setup: bad drive type\n" ); 2172 else 2173 DriveType = ints[1]; 2174 2175 if (ints[0] >= 2) 2176 UseTrackbuffer = (ints[2] > 0); 2177 2178 for( i = 3; i <= ints[0] && i-3 < FD_MAX_UNITS; ++i ) { 2179 if (ints[i] != 2 && ints[i] != 3 && ints[i] != 6 && ints[i] != 12) 2180 printk(KERN_ERR "ataflop_setup: bad steprate\n" ); 2181 else 2182 UserSteprate[i-3] = ints[i]; 2183 } 2184 return 1; 2185 } 2186 2187 __setup("floppy=", atari_floppy_setup); 2188 #endif 2189 2190 static void __exit atari_floppy_exit(void) 2191 { 2192 unregister_blkdev(FLOPPY_MAJOR, "fd"); 2193 atari_floppy_cleanup(); 2194 } 2195 2196 module_init(atari_floppy_init) 2197 module_exit(atari_floppy_exit) 2198 2199 MODULE_LICENSE("GPL"); 2200