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