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ataflop.c
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linux-6.19.14/drivers/block/ataflop.c
1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * drivers/block/ataflop.c 4 * 5 * Copyright (C) 1993 Greg Harp 6 * Atari Support by Bjoern Brauel, Roman Hodek 7 * 8 * Big cleanup Sep 11..14 1994 Roman Hodek: 9 * - Driver now works interrupt driven 10 * - Support for two drives; should work, but I cannot test that :-( 11 * - Reading is done in whole tracks and buffered to speed up things 12 * - Disk change detection and drive deselecting after motor-off 13 * similar to TOS 14 * - Autodetection of disk format (DD/HD); untested yet, because I 15 * don't have an HD drive :-( 16 * 17 * Fixes Nov 13 1994 Martin Schaller: 18 * - Autodetection works now 19 * - Support for 5 1/4'' disks 20 * - Removed drive type (unknown on atari) 21 * - Do seeks with 8 Mhz 22 * 23 * Changes by Andreas Schwab: 24 * - After errors in multiple read mode try again reading single sectors 25 * (Feb 1995): 26 * - Clean up error handling 27 * - Set blk_size for proper size checking 28 * - Initialize track register when testing presence of floppy 29 * - Implement some ioctl's 30 * 31 * Changes by Torsten Lang: 32 * - When probing the floppies we should add the FDCCMDADD_H flag since 33 * the FDC will otherwise wait forever when no disk is inserted... 34 * 35 * ++ Freddi Aschwanden (fa) 20.9.95 fixes for medusa: 36 * - MFPDELAY() after each FDC access -> atari 37 * - more/other disk formats 38 * - DMA to the block buffer directly if we have a 32bit DMA 39 * - for medusa, the step rate is always 3ms 40 * - on medusa, use only cache_push() 41 * Roman: 42 * - Make disk format numbering independent from minors 43 * - Let user set max. supported drive type (speeds up format 44 * detection, saves buffer space) 45 * 46 * Roman 10/15/95: 47 * - implement some more ioctls 48 * - disk formatting 49 * 50 * Andreas 95/12/12: 51 * - increase gap size at start of track for HD/ED disks 52 * 53 * Michael (MSch) 11/07/96: 54 * - implemented FDSETPRM and FDDEFPRM ioctl 55 * 56 * Andreas (97/03/19): 57 * - implemented missing BLK* ioctls 58 * 59 * Things left to do: 60 * - Formatting 61 * - Maybe a better strategy for disk change detection (does anyone 62 * know one?) 63 */ 64 65#include <linux/module.h> 66 67#include <linux/fd.h> 68#include <linux/delay.h> 69#include <linux/init.h> 70#include <linux/blk-mq.h> 71#include <linux/major.h> 72#include <linux/mutex.h> 73#include <linux/completion.h> 74#include <linux/wait.h> 75 76#include <asm/atariints.h> 77#include <asm/atari_stdma.h> 78#include <asm/atari_stram.h> 79 80#define FD_MAX_UNITS 2 81 82#undef DEBUG 83 84static DEFINE_MUTEX(ataflop_mutex); 85static struct request *fd_request; 86 87/* 88 * WD1772 stuff 89 */ 90 91/* register codes */ 92 93#define FDCSELREG_STP (0x80) /* command/status register */ 94#define FDCSELREG_TRA (0x82) /* track register */ 95#define FDCSELREG_SEC (0x84) /* sector register */ 96#define FDCSELREG_DTA (0x86) /* data register */ 97 98/* register names for FDC_READ/WRITE macros */ 99 100#define FDCREG_CMD 0 101#define FDCREG_STATUS 0 102#define FDCREG_TRACK 2 103#define FDCREG_SECTOR 4 104#define FDCREG_DATA 6 105 106/* command opcodes */ 107 108#define FDCCMD_RESTORE (0x00) /* - */ 109#define FDCCMD_SEEK (0x10) /* | */ 110#define FDCCMD_STEP (0x20) /* | TYP 1 Commands */ 111#define FDCCMD_STIN (0x40) /* | */ 112#define FDCCMD_STOT (0x60) /* - */ 113#define FDCCMD_RDSEC (0x80) /* - TYP 2 Commands */ 114#define FDCCMD_WRSEC (0xa0) /* - " */ 115#define FDCCMD_RDADR (0xc0) /* - */ 116#define FDCCMD_RDTRA (0xe0) /* | TYP 3 Commands */ 117#define FDCCMD_WRTRA (0xf0) /* - */ 118#define FDCCMD_FORCI (0xd0) /* - TYP 4 Command */ 119 120/* command modifier bits */ 121 122#define FDCCMDADD_SR6 (0x00) /* step rate settings */ 123#define FDCCMDADD_SR12 (0x01) 124#define FDCCMDADD_SR2 (0x02) 125#define FDCCMDADD_SR3 (0x03) 126#define FDCCMDADD_V (0x04) /* verify */ 127#define FDCCMDADD_H (0x08) /* wait for spin-up */ 128#define FDCCMDADD_U (0x10) /* update track register */ 129#define FDCCMDADD_M (0x10) /* multiple sector access */ 130#define FDCCMDADD_E (0x04) /* head settling flag */ 131#define FDCCMDADD_P (0x02) /* precompensation off */ 132#define FDCCMDADD_A0 (0x01) /* DAM flag */ 133 134/* status register bits */ 135 136#define FDCSTAT_MOTORON (0x80) /* motor on */ 137#define FDCSTAT_WPROT (0x40) /* write protected (FDCCMD_WR*) */ 138#define FDCSTAT_SPINUP (0x20) /* motor speed stable (Type I) */ 139#define FDCSTAT_DELDAM (0x20) /* sector has deleted DAM (Type II+III) */ 140#define FDCSTAT_RECNF (0x10) /* record not found */ 141#define FDCSTAT_CRC (0x08) /* CRC error */ 142#define FDCSTAT_TR00 (0x04) /* Track 00 flag (Type I) */ 143#define FDCSTAT_LOST (0x04) /* Lost Data (Type II+III) */ 144#define FDCSTAT_IDX (0x02) /* Index status (Type I) */ 145#define FDCSTAT_DRQ (0x02) /* DRQ status (Type II+III) */ 146#define FDCSTAT_BUSY (0x01) /* FDC is busy */ 147 148 149/* PSG Port A Bit Nr 0 .. Side Sel .. 0 -> Side 1 1 -> Side 2 */ 150#define DSKSIDE (0x01) 151 152#define DSKDRVNONE (0x06) 153#define DSKDRV0 (0x02) 154#define DSKDRV1 (0x04) 155 156/* step rates */ 157#define FDCSTEP_6 0x00 158#define FDCSTEP_12 0x01 159#define FDCSTEP_2 0x02 160#define FDCSTEP_3 0x03 161 162struct atari_format_descr { 163 int track; /* to be formatted */ 164 int head; /* "" "" */ 165 int sect_offset; /* offset of first sector */ 166}; 167 168/* Disk types: DD, HD, ED */ 169static struct atari_disk_type { 170 const char *name; 171 unsigned spt; /* sectors per track */ 172 unsigned blocks; /* total number of blocks */ 173 unsigned fdc_speed; /* fdc_speed setting */ 174 unsigned stretch; /* track doubling ? */ 175} atari_disk_type[] = { 176 { "d360", 9, 720, 0, 0}, /* 0: 360kB diskette */ 177 { "D360", 9, 720, 0, 1}, /* 1: 360kb in 720k or 1.2MB drive */ 178 { "D720", 9,1440, 0, 0}, /* 2: 720kb in 720k or 1.2MB drive */ 179 { "D820", 10,1640, 0, 0}, /* 3: DD disk with 82 tracks/10 sectors */ 180/* formats above are probed for type DD */ 181#define MAX_TYPE_DD 3 182 { "h1200",15,2400, 3, 0}, /* 4: 1.2MB diskette */ 183 { "H1440",18,2880, 3, 0}, /* 5: 1.4 MB diskette (HD) */ 184 { "H1640",20,3280, 3, 0}, /* 6: 1.64MB diskette (fat HD) 82 tr 20 sec */ 185/* formats above are probed for types DD and HD */ 186#define MAX_TYPE_HD 6 187 { "E2880",36,5760, 3, 0}, /* 7: 2.8 MB diskette (ED) */ 188 { "E3280",40,6560, 3, 0}, /* 8: 3.2 MB diskette (fat ED) 82 tr 40 sec */ 189/* formats above are probed for types DD, HD and ED */ 190#define MAX_TYPE_ED 8 191/* types below are never autoprobed */ 192 { "H1680",21,3360, 3, 0}, /* 9: 1.68MB diskette (fat HD) 80 tr 21 sec */ 193 { "h410",10,820, 0, 1}, /* 10: 410k diskette 41 tr 10 sec, stretch */ 194 { "h1476",18,2952, 3, 0}, /* 11: 1.48MB diskette 82 tr 18 sec */ 195 { "H1722",21,3444, 3, 0}, /* 12: 1.72MB diskette 82 tr 21 sec */ 196 { "h420",10,840, 0, 1}, /* 13: 420k diskette 42 tr 10 sec, stretch */ 197 { "H830",10,1660, 0, 0}, /* 14: 820k diskette 83 tr 10 sec */ 198 { "h1494",18,2952, 3, 0}, /* 15: 1.49MB diskette 83 tr 18 sec */ 199 { "H1743",21,3486, 3, 0}, /* 16: 1.74MB diskette 83 tr 21 sec */ 200 { "h880",11,1760, 0, 0}, /* 17: 880k diskette 80 tr 11 sec */ 201 { "D1040",13,2080, 0, 0}, /* 18: 1.04MB diskette 80 tr 13 sec */ 202 { "D1120",14,2240, 0, 0}, /* 19: 1.12MB diskette 80 tr 14 sec */ 203 { "h1600",20,3200, 3, 0}, /* 20: 1.60MB diskette 80 tr 20 sec */ 204 { "H1760",22,3520, 3, 0}, /* 21: 1.76MB diskette 80 tr 22 sec */ 205 { "H1920",24,3840, 3, 0}, /* 22: 1.92MB diskette 80 tr 24 sec */ 206 { "E3200",40,6400, 3, 0}, /* 23: 3.2MB diskette 80 tr 40 sec */ 207 { "E3520",44,7040, 3, 0}, /* 24: 3.52MB diskette 80 tr 44 sec */ 208 { "E3840",48,7680, 3, 0}, /* 25: 3.84MB diskette 80 tr 48 sec */ 209 { "H1840",23,3680, 3, 0}, /* 26: 1.84MB diskette 80 tr 23 sec */ 210 { "D800",10,1600, 0, 0}, /* 27: 800k diskette 80 tr 10 sec */ 211}; 212 213static int StartDiskType[] = { 214 MAX_TYPE_DD, 215 MAX_TYPE_HD, 216 MAX_TYPE_ED 217}; 218 219#define TYPE_DD 0 220#define TYPE_HD 1 221#define TYPE_ED 2 222 223static int DriveType = TYPE_HD; 224 225static DEFINE_SPINLOCK(ataflop_lock); 226 227/* Array for translating minors into disk formats */ 228static struct { 229 int index; 230 unsigned drive_types; 231} minor2disktype[] = { 232 { 0, TYPE_DD }, /* 1: d360 */ 233 { 4, TYPE_HD }, /* 2: h1200 */ 234 { 1, TYPE_DD }, /* 3: D360 */ 235 { 2, TYPE_DD }, /* 4: D720 */ 236 { 1, TYPE_DD }, /* 5: h360 = D360 */ 237 { 2, TYPE_DD }, /* 6: h720 = D720 */ 238 { 5, TYPE_HD }, /* 7: H1440 */ 239 { 7, TYPE_ED }, /* 8: E2880 */ 240/* some PC formats :-) */ 241 { 8, TYPE_ED }, /* 9: E3280 <- was "CompaQ" == E2880 for PC */ 242 { 5, TYPE_HD }, /* 10: h1440 = H1440 */ 243 { 9, TYPE_HD }, /* 11: H1680 */ 244 { 10, TYPE_DD }, /* 12: h410 */ 245 { 3, TYPE_DD }, /* 13: H820 <- == D820, 82x10 */ 246 { 11, TYPE_HD }, /* 14: h1476 */ 247 { 12, TYPE_HD }, /* 15: H1722 */ 248 { 13, TYPE_DD }, /* 16: h420 */ 249 { 14, TYPE_DD }, /* 17: H830 */ 250 { 15, TYPE_HD }, /* 18: h1494 */ 251 { 16, TYPE_HD }, /* 19: H1743 */ 252 { 17, TYPE_DD }, /* 20: h880 */ 253 { 18, TYPE_DD }, /* 21: D1040 */ 254 { 19, TYPE_DD }, /* 22: D1120 */ 255 { 20, TYPE_HD }, /* 23: h1600 */ 256 { 21, TYPE_HD }, /* 24: H1760 */ 257 { 22, TYPE_HD }, /* 25: H1920 */ 258 { 23, TYPE_ED }, /* 26: E3200 */ 259 { 24, TYPE_ED }, /* 27: E3520 */ 260 { 25, TYPE_ED }, /* 28: E3840 */ 261 { 26, TYPE_HD }, /* 29: H1840 */ 262 { 27, TYPE_DD }, /* 30: D800 */ 263 { 6, TYPE_HD }, /* 31: H1640 <- was H1600 == h1600 for PC */ 264}; 265 266#define NUM_DISK_MINORS ARRAY_SIZE(minor2disktype) 267 268/* 269 * Maximum disk size (in kilobytes). This default is used whenever the 270 * current disk size is unknown. 271 */ 272#define MAX_DISK_SIZE 3280 273 274/* 275 * MSch: User-provided type information. 'drive' points to 276 * the respective entry of this array. Set by FDSETPRM ioctls. 277 */ 278static struct atari_disk_type user_params[FD_MAX_UNITS]; 279 280/* 281 * User-provided permanent type information. 'drive' points to 282 * the respective entry of this array. Set by FDDEFPRM ioctls, 283 * restored upon disk change by floppy_revalidate() if valid (as seen by 284 * default_params[].blocks > 0 - a bit in unit[].flags might be used for this?) 285 */ 286static struct atari_disk_type default_params[FD_MAX_UNITS]; 287 288/* current info on each unit */ 289static struct atari_floppy_struct { 290 int connected; /* !=0 : drive is connected */ 291 int autoprobe; /* !=0 : do autoprobe */ 292 293 struct atari_disk_type *disktype; /* current type of disk */ 294 295 int track; /* current head position or -1 if 296 unknown */ 297 unsigned int steprate; /* steprate setting */ 298 unsigned int wpstat; /* current state of WP signal (for 299 disk change detection) */ 300 int flags; /* flags */ 301 struct gendisk *disk[NUM_DISK_MINORS]; 302 bool registered[NUM_DISK_MINORS]; 303 int ref; 304 int type; 305 struct blk_mq_tag_set tag_set; 306 int error_count; 307} unit[FD_MAX_UNITS]; 308 309#define UD unit[drive] 310#define UDT unit[drive].disktype 311#define SUD unit[SelectedDrive] 312#define SUDT unit[SelectedDrive].disktype 313 314 315#define FDC_READ(reg) ({ \ 316 /* unsigned long __flags; */ \ 317 unsigned short __val; \ 318 /* local_irq_save(__flags); */ \ 319 dma_wd.dma_mode_status = 0x80 | (reg); \ 320 udelay(25); \ 321 __val = dma_wd.fdc_acces_seccount; \ 322 MFPDELAY(); \ 323 /* local_irq_restore(__flags); */ \ 324 __val & 0xff; \ 325}) 326 327#define FDC_WRITE(reg,val) \ 328 do { \ 329 /* unsigned long __flags; */ \ 330 /* local_irq_save(__flags); */ \ 331 dma_wd.dma_mode_status = 0x80 | (reg); \ 332 udelay(25); \ 333 dma_wd.fdc_acces_seccount = (val); \ 334 MFPDELAY(); \ 335 /* local_irq_restore(__flags); */ \ 336 } while(0) 337 338 339/* Buffering variables: 340 * First, there is a DMA buffer in ST-RAM that is used for floppy DMA 341 * operations. Second, a track buffer is used to cache a whole track 342 * of the disk to save read operations. These are two separate buffers 343 * because that allows write operations without clearing the track buffer. 344 */ 345 346static int MaxSectors[] = { 347 11, 22, 44 348}; 349static int BufferSize[] = { 350 15*512, 30*512, 60*512 351}; 352 353#define BUFFER_SIZE (BufferSize[DriveType]) 354 355unsigned char *DMABuffer; /* buffer for writes */ 356static unsigned long PhysDMABuffer; /* physical address */ 357 358static int UseTrackbuffer = -1; /* Do track buffering? */ 359module_param(UseTrackbuffer, int, 0); 360 361unsigned char *TrackBuffer; /* buffer for reads */ 362static unsigned long PhysTrackBuffer; /* physical address */ 363static int BufferDrive, BufferSide, BufferTrack; 364static int read_track; /* non-zero if we are reading whole tracks */ 365 366#define SECTOR_BUFFER(sec) (TrackBuffer + ((sec)-1)*512) 367#define IS_BUFFERED(drive,side,track) \ 368 (BufferDrive == (drive) && BufferSide == (side) && BufferTrack == (track)) 369 370/* 371 * These are global variables, as that's the easiest way to give 372 * information to interrupts. They are the data used for the current 373 * request. 374 */ 375static int SelectedDrive = 0; 376static int ReqCmd, ReqBlock; 377static int ReqSide, ReqTrack, ReqSector, ReqCnt; 378static int HeadSettleFlag = 0; 379static unsigned char *ReqData, *ReqBuffer; 380static int MotorOn = 0, MotorOffTrys; 381static int IsFormatting = 0, FormatError; 382 383static int UserSteprate[FD_MAX_UNITS] = { -1, -1 }; 384module_param_array(UserSteprate, int, NULL, 0); 385 386static DECLARE_COMPLETION(format_wait); 387 388static unsigned long changed_floppies = 0xff, fake_change = 0; 389#define CHECK_CHANGE_DELAY HZ/2 390 391#define FD_MOTOR_OFF_DELAY (3*HZ) 392#define FD_MOTOR_OFF_MAXTRY (10*20) 393 394#define FLOPPY_TIMEOUT (6*HZ) 395#define RECALIBRATE_ERRORS 4 /* After this many errors the drive 396 * will be recalibrated. */ 397#define MAX_ERRORS 8 /* After this many errors the driver 398 * will give up. */ 399 400 401/* 402 * The driver is trying to determine the correct media format 403 * while Probing is set. fd_rwsec_done() clears it after a 404 * successful access. 405 */ 406static int Probing = 0; 407 408/* This flag is set when a dummy seek is necessary to make the WP 409 * status bit accessible. 410 */ 411static int NeedSeek = 0; 412 413 414#ifdef DEBUG 415#define DPRINT(a) printk a 416#else 417#define DPRINT(a) 418#endif 419 420/***************************** Prototypes *****************************/ 421 422static void fd_select_side( int side ); 423static void fd_select_drive( int drive ); 424static void fd_deselect( void ); 425static void fd_motor_off_timer(struct timer_list *unused); 426static void check_change(struct timer_list *unused); 427static irqreturn_t floppy_irq (int irq, void *dummy); 428static void fd_error( void ); 429static int do_format(int drive, int type, struct atari_format_descr *desc); 430static void do_fd_action( int drive ); 431static void fd_calibrate( void ); 432static void fd_calibrate_done( int status ); 433static void fd_seek( void ); 434static void fd_seek_done( int status ); 435static void fd_rwsec( void ); 436static void fd_readtrack_check(struct timer_list *unused); 437static void fd_rwsec_done( int status ); 438static void fd_rwsec_done1(int status); 439static void fd_writetrack( void ); 440static void fd_writetrack_done( int status ); 441static void fd_times_out(struct timer_list *unused); 442static void finish_fdc( void ); 443static void finish_fdc_done( int dummy ); 444static void setup_req_params( int drive ); 445static int fd_locked_ioctl(struct block_device *bdev, blk_mode_t mode, 446 unsigned int cmd, unsigned long param); 447static void fd_probe( int drive ); 448static int fd_test_drive_present( int drive ); 449static void config_types( void ); 450static int floppy_open(struct gendisk *disk, blk_mode_t mode); 451static void floppy_release(struct gendisk *disk); 452 453/************************* End of Prototypes **************************/ 454 455static DEFINE_TIMER(motor_off_timer, fd_motor_off_timer); 456static DEFINE_TIMER(readtrack_timer, fd_readtrack_check); 457static DEFINE_TIMER(timeout_timer, fd_times_out); 458static DEFINE_TIMER(fd_timer, check_change); 459 460static void fd_end_request_cur(blk_status_t err) 461{ 462 DPRINT(("fd_end_request_cur(), bytes %d of %d\n", 463 blk_rq_cur_bytes(fd_request), 464 blk_rq_bytes(fd_request))); 465 466 if (!blk_update_request(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 479static inline void start_motor_off_timer(void) 480{ 481 mod_timer(&motor_off_timer, jiffies + FD_MOTOR_OFF_DELAY); 482 MotorOffTrys = 0; 483} 484 485static inline void start_check_change_timer( void ) 486{ 487 mod_timer(&fd_timer, jiffies + CHECK_CHANGE_DELAY); 488} 489 490static inline void start_timeout(void) 491{ 492 mod_timer(&timeout_timer, jiffies + FLOPPY_TIMEOUT); 493} 494 495static inline void stop_timeout(void) 496{ 497 timer_delete(&timeout_timer); 498} 499 500/* Select the side to use. */ 501 502static void fd_select_side( int side ) 503{ 504 unsigned long flags; 505 506 /* protect against various other ints mucking around with the PSG */ 507 local_irq_save(flags); 508 509 sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */ 510 sound_ym.wd_data = (side == 0) ? sound_ym.rd_data_reg_sel | 0x01 : 511 sound_ym.rd_data_reg_sel & 0xfe; 512 513 local_irq_restore(flags); 514} 515 516 517/* Select a drive, update the FDC's track register and set the correct 518 * clock speed for this disk's type. 519 */ 520 521static void fd_select_drive( int drive ) 522{ 523 unsigned long flags; 524 unsigned char tmp; 525 526 if (drive == SelectedDrive) 527 return; 528 529 /* protect against various other ints mucking around with the PSG */ 530 local_irq_save(flags); 531 sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */ 532 tmp = sound_ym.rd_data_reg_sel; 533 sound_ym.wd_data = (tmp | DSKDRVNONE) & ~(drive == 0 ? DSKDRV0 : DSKDRV1); 534 atari_dont_touch_floppy_select = 1; 535 local_irq_restore(flags); 536 537 /* restore track register to saved value */ 538 FDC_WRITE( FDCREG_TRACK, UD.track ); 539 udelay(25); 540 541 /* select 8/16 MHz */ 542 if (UDT) 543 if (ATARIHW_PRESENT(FDCSPEED)) 544 dma_wd.fdc_speed = UDT->fdc_speed; 545 546 SelectedDrive = drive; 547} 548 549 550/* Deselect both drives. */ 551 552static void fd_deselect( void ) 553{ 554 unsigned long flags; 555 556 /* protect against various other ints mucking around with the PSG */ 557 local_irq_save(flags); 558 atari_dont_touch_floppy_select = 0; 559 sound_ym.rd_data_reg_sel=14; /* Select PSG Port A */ 560 sound_ym.wd_data = (sound_ym.rd_data_reg_sel | 561 (MACH_IS_FALCON ? 3 : 7)); /* no drives selected */ 562 /* On Falcon, the drive B select line is used on the printer port, so 563 * leave it alone... */ 564 SelectedDrive = -1; 565 local_irq_restore(flags); 566} 567 568 569/* This timer function deselects the drives when the FDC switched the 570 * motor off. The deselection cannot happen earlier because the FDC 571 * counts the index signals, which arrive only if one drive is selected. 572 */ 573 574static void fd_motor_off_timer(struct timer_list *unused) 575{ 576 unsigned char status; 577 578 if (SelectedDrive < 0) 579 /* no drive selected, needn't deselect anyone */ 580 return; 581 582 if (stdma_islocked()) 583 goto retry; 584 585 status = FDC_READ( FDCREG_STATUS ); 586 587 if (!(status & 0x80)) { 588 /* motor already turned off by FDC -> deselect drives */ 589 MotorOn = 0; 590 fd_deselect(); 591 return; 592 } 593 /* not yet off, try again */ 594 595 retry: 596 /* Test again later; if tested too often, it seems there is no disk 597 * in the drive and the FDC will leave the motor on forever (or, 598 * at least until a disk is inserted). So we'll test only twice 599 * per second from then on... 600 */ 601 mod_timer(&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 610static void check_change(struct timer_list *unused) 611{ 612 static int drive = 0; 613 614 unsigned long flags; 615 unsigned char old_porta; 616 int stat; 617 618 if (++drive > 1 || !UD.connected) 619 drive = 0; 620 621 /* protect against various other ints mucking around with the PSG */ 622 local_irq_save(flags); 623 624 if (!stdma_islocked()) { 625 sound_ym.rd_data_reg_sel = 14; 626 old_porta = sound_ym.rd_data_reg_sel; 627 sound_ym.wd_data = (old_porta | DSKDRVNONE) & 628 ~(drive == 0 ? DSKDRV0 : DSKDRV1); 629 stat = !!(FDC_READ( FDCREG_STATUS ) & FDCSTAT_WPROT); 630 sound_ym.wd_data = old_porta; 631 632 if (stat != UD.wpstat) { 633 DPRINT(( "wpstat[%d] = %d\n", drive, stat )); 634 UD.wpstat = stat; 635 set_bit (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 648static inline void set_head_settle_flag(void) 649{ 650 HeadSettleFlag = FDCCMDADD_E; 651} 652 653static inline int get_head_settle_flag(void) 654{ 655 int tmp = HeadSettleFlag; 656 HeadSettleFlag = 0; 657 return( tmp ); 658} 659 660static inline void copy_buffer(void *from, void *to) 661{ 662 ulong *p1 = (ulong *)from, *p2 = (ulong *)to; 663 int cnt; 664 665 for (cnt = 512/4; cnt; cnt--) 666 *p2++ = *p1++; 667} 668 669/* General Interrupt Handling */ 670 671static void (*FloppyIRQHandler)( int status ) = NULL; 672 673static irqreturn_t floppy_irq (int irq, void *dummy) 674{ 675 unsigned char status; 676 void (*handler)( int ); 677 678 handler = xchg(&FloppyIRQHandler, NULL); 679 680 if (handler) { 681 nop(); 682 status = FDC_READ( FDCREG_STATUS ); 683 DPRINT(("FDC irq, status = %02x handler = %08lx\n",status,(unsigned long)handler)); 684 handler( status ); 685 } 686 else { 687 DPRINT(("FDC irq, no handler\n")); 688 } 689 return IRQ_HANDLED; 690} 691 692 693/* Error handling: If some error happened, retry some times, then 694 * recalibrate, then try again, and fail after MAX_ERRORS. 695 */ 696 697static void fd_error( void ) 698{ 699 if (IsFormatting) { 700 IsFormatting = 0; 701 FormatError = 1; 702 complete(&format_wait); 703 return; 704 } 705 706 if (!fd_request) 707 return; 708 709 unit[SelectedDrive].error_count++; 710 if (unit[SelectedDrive].error_count >= MAX_ERRORS) { 711 printk(KERN_ERR "fd%d: too many errors.\n", SelectedDrive ); 712 fd_end_request_cur(BLK_STS_IOERR); 713 finish_fdc(); 714 return; 715 } 716 else if (unit[SelectedDrive].error_count == RECALIBRATE_ERRORS) { 717 printk(KERN_WARNING "fd%d: recalibrating\n", SelectedDrive ); 718 if (SelectedDrive != -1) 719 SUD.track = -1; 720 } 721 /* need to re-run request to recalibrate */ 722 atari_disable_irq( IRQ_MFP_FDC ); 723 724 setup_req_params( SelectedDrive ); 725 do_fd_action( SelectedDrive ); 726 727 atari_enable_irq( IRQ_MFP_FDC ); 728} 729 730 731 732#define SET_IRQ_HANDLER(proc) do { FloppyIRQHandler = (proc); } while(0) 733 734 735/* ---------- Formatting ---------- */ 736 737#define FILL(n,val) \ 738 do { \ 739 memset( p, val, n ); \ 740 p += n; \ 741 } while(0) 742 743static int do_format(int drive, int type, struct atari_format_descr *desc) 744{ 745 struct request_queue *q; 746 unsigned char *p; 747 int sect, nsect; 748 unsigned long flags; 749 unsigned int memflags; 750 int ret; 751 752 if (type) { 753 type--; 754 if (type >= NUM_DISK_MINORS || 755 minor2disktype[type].drive_types > DriveType) { 756 finish_fdc(); 757 return -EINVAL; 758 } 759 } 760 761 q = unit[drive].disk[type]->queue; 762 memflags = blk_mq_freeze_queue(q); 763 blk_mq_quiesce_queue(q); 764 765 local_irq_save(flags); 766 stdma_lock(floppy_irq, NULL); 767 atari_turnon_irq( IRQ_MFP_FDC ); /* should be already, just to be sure */ 768 local_irq_restore(flags); 769 770 if (type) { 771 type = minor2disktype[type].index; 772 UDT = &atari_disk_type[type]; 773 } 774 775 if (!UDT || desc->track >= UDT->blocks/UDT->spt/2 || desc->head >= 2) { 776 finish_fdc(); 777 ret = -EINVAL; 778 goto out; 779 } 780 781 nsect = UDT->spt; 782 p = TrackBuffer; 783 /* The track buffer is used for the raw track data, so its 784 contents become invalid! */ 785 BufferDrive = -1; 786 /* stop deselect timer */ 787 timer_delete(&motor_off_timer); 788 789 FILL( 60 * (nsect / 9), 0x4e ); 790 for( sect = 0; sect < nsect; ++sect ) { 791 FILL( 12, 0 ); 792 FILL( 3, 0xf5 ); 793 *p++ = 0xfe; 794 *p++ = desc->track; 795 *p++ = desc->head; 796 *p++ = (nsect + sect - desc->sect_offset) % nsect + 1; 797 *p++ = 2; 798 *p++ = 0xf7; 799 FILL( 22, 0x4e ); 800 FILL( 12, 0 ); 801 FILL( 3, 0xf5 ); 802 *p++ = 0xfb; 803 FILL( 512, 0xe5 ); 804 *p++ = 0xf7; 805 FILL( 40, 0x4e ); 806 } 807 FILL( TrackBuffer+BUFFER_SIZE-p, 0x4e ); 808 809 IsFormatting = 1; 810 FormatError = 0; 811 ReqTrack = desc->track; 812 ReqSide = desc->head; 813 do_fd_action( drive ); 814 815 wait_for_completion(&format_wait); 816 817 finish_fdc(); 818 ret = FormatError ? -EIO : 0; 819out: 820 blk_mq_unquiesce_queue(q); 821 blk_mq_unfreeze_queue(q, memflags); 822 return ret; 823} 824 825 826/* do_fd_action() is the general procedure for a fd request: All 827 * required parameter settings (drive select, side select, track 828 * position) are checked and set if needed. For each of these 829 * parameters and the actual reading or writing exist two functions: 830 * one that starts the setting (or skips it if possible) and one 831 * callback for the "done" interrupt. Each done func calls the next 832 * set function to propagate the request down to fd_rwsec_done(). 833 */ 834 835static void do_fd_action( int drive ) 836{ 837 DPRINT(("do_fd_action\n")); 838 839 if (UseTrackbuffer && !IsFormatting) { 840 repeat: 841 if (IS_BUFFERED( drive, ReqSide, ReqTrack )) { 842 if (ReqCmd == READ) { 843 copy_buffer( SECTOR_BUFFER(ReqSector), ReqData ); 844 if (++ReqCnt < blk_rq_cur_sectors(fd_request)) { 845 /* read next sector */ 846 setup_req_params( drive ); 847 goto repeat; 848 } 849 else { 850 /* all sectors finished */ 851 fd_end_request_cur(BLK_STS_OK); 852 finish_fdc(); 853 return; 854 } 855 } 856 else { 857 /* cmd == WRITE, pay attention to track buffer 858 * consistency! */ 859 copy_buffer( ReqData, SECTOR_BUFFER(ReqSector) ); 860 } 861 } 862 } 863 864 if (SelectedDrive != drive) 865 fd_select_drive( drive ); 866 867 if (UD.track == -1) 868 fd_calibrate(); 869 else if (UD.track != ReqTrack << UDT->stretch) 870 fd_seek(); 871 else if (IsFormatting) 872 fd_writetrack(); 873 else 874 fd_rwsec(); 875} 876 877 878/* Seek to track 0 if the current track is unknown */ 879 880static void fd_calibrate( void ) 881{ 882 if (SUD.track >= 0) { 883 fd_calibrate_done( 0 ); 884 return; 885 } 886 887 if (ATARIHW_PRESENT(FDCSPEED)) 888 dma_wd.fdc_speed = 0; /* always seek with 8 Mhz */ 889 DPRINT(("fd_calibrate\n")); 890 SET_IRQ_HANDLER( fd_calibrate_done ); 891 /* we can't verify, since the speed may be incorrect */ 892 FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | SUD.steprate ); 893 894 NeedSeek = 1; 895 MotorOn = 1; 896 start_timeout(); 897 /* wait for IRQ */ 898} 899 900 901static void fd_calibrate_done( int status ) 902{ 903 DPRINT(("fd_calibrate_done()\n")); 904 stop_timeout(); 905 906 /* set the correct speed now */ 907 if (ATARIHW_PRESENT(FDCSPEED)) 908 dma_wd.fdc_speed = SUDT->fdc_speed; 909 if (status & FDCSTAT_RECNF) { 910 printk(KERN_ERR "fd%d: restore failed\n", SelectedDrive ); 911 fd_error(); 912 } 913 else { 914 SUD.track = 0; 915 fd_seek(); 916 } 917} 918 919 920/* Seek the drive to the requested track. The drive must have been 921 * calibrated at some point before this. 922 */ 923 924static void fd_seek( void ) 925{ 926 if (SUD.track == ReqTrack << SUDT->stretch) { 927 fd_seek_done( 0 ); 928 return; 929 } 930 931 if (ATARIHW_PRESENT(FDCSPEED)) { 932 dma_wd.fdc_speed = 0; /* always seek witch 8 Mhz */ 933 MFPDELAY(); 934 } 935 936 DPRINT(("fd_seek() to track %d\n",ReqTrack)); 937 FDC_WRITE( FDCREG_DATA, ReqTrack << SUDT->stretch); 938 udelay(25); 939 SET_IRQ_HANDLER( fd_seek_done ); 940 FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK | SUD.steprate ); 941 942 MotorOn = 1; 943 set_head_settle_flag(); 944 start_timeout(); 945 /* wait for IRQ */ 946} 947 948 949static void fd_seek_done( int status ) 950{ 951 DPRINT(("fd_seek_done()\n")); 952 stop_timeout(); 953 954 /* set the correct speed */ 955 if (ATARIHW_PRESENT(FDCSPEED)) 956 dma_wd.fdc_speed = SUDT->fdc_speed; 957 if (status & FDCSTAT_RECNF) { 958 printk(KERN_ERR "fd%d: seek error (to track %d)\n", 959 SelectedDrive, ReqTrack ); 960 /* we don't know exactly which track we are on now! */ 961 SUD.track = -1; 962 fd_error(); 963 } 964 else { 965 SUD.track = ReqTrack << SUDT->stretch; 966 NeedSeek = 0; 967 if (IsFormatting) 968 fd_writetrack(); 969 else 970 fd_rwsec(); 971 } 972} 973 974 975/* This does the actual reading/writing after positioning the head 976 * over the correct track. 977 */ 978 979static int MultReadInProgress = 0; 980 981 982static void fd_rwsec( void ) 983{ 984 unsigned long paddr, flags; 985 unsigned int rwflag, old_motoron; 986 unsigned int track; 987 988 DPRINT(("fd_rwsec(), Sec=%d, Access=%c\n",ReqSector, ReqCmd == WRITE ? 'w' : 'r' )); 989 if (ReqCmd == WRITE) { 990 if (ATARIHW_PRESENT(EXTD_DMA)) { 991 paddr = virt_to_phys(ReqData); 992 } 993 else { 994 copy_buffer( ReqData, DMABuffer ); 995 paddr = PhysDMABuffer; 996 } 997 dma_cache_maintenance( paddr, 512, 1 ); 998 rwflag = 0x100; 999 } 1000 else { 1001 if (read_track) 1002 paddr = PhysTrackBuffer; 1003 else 1004 paddr = ATARIHW_PRESENT(EXTD_DMA) ? 1005 virt_to_phys(ReqData) : PhysDMABuffer; 1006 rwflag = 0; 1007 } 1008 1009 fd_select_side( ReqSide ); 1010 1011 /* Start sector of this operation */ 1012 FDC_WRITE( FDCREG_SECTOR, read_track ? 1 : ReqSector ); 1013 MFPDELAY(); 1014 /* Cheat for track if stretch != 0 */ 1015 if (SUDT->stretch) { 1016 track = FDC_READ( FDCREG_TRACK); 1017 MFPDELAY(); 1018 FDC_WRITE( FDCREG_TRACK, track >> SUDT->stretch); 1019 } 1020 udelay(25); 1021 1022 /* Setup DMA */ 1023 local_irq_save(flags); 1024 dma_wd.dma_lo = (unsigned char)paddr; 1025 MFPDELAY(); 1026 paddr >>= 8; 1027 dma_wd.dma_md = (unsigned char)paddr; 1028 MFPDELAY(); 1029 paddr >>= 8; 1030 if (ATARIHW_PRESENT(EXTD_DMA)) 1031 st_dma_ext_dmahi = (unsigned short)paddr; 1032 else 1033 dma_wd.dma_hi = (unsigned char)paddr; 1034 MFPDELAY(); 1035 local_irq_restore(flags); 1036 1037 /* Clear FIFO and switch DMA to correct mode */ 1038 dma_wd.dma_mode_status = 0x90 | rwflag; 1039 MFPDELAY(); 1040 dma_wd.dma_mode_status = 0x90 | (rwflag ^ 0x100); 1041 MFPDELAY(); 1042 dma_wd.dma_mode_status = 0x90 | rwflag; 1043 MFPDELAY(); 1044 1045 /* How many sectors for DMA */ 1046 dma_wd.fdc_acces_seccount = read_track ? SUDT->spt : 1; 1047 1048 udelay(25); 1049 1050 /* Start operation */ 1051 dma_wd.dma_mode_status = FDCSELREG_STP | rwflag; 1052 udelay(25); 1053 SET_IRQ_HANDLER( fd_rwsec_done ); 1054 dma_wd.fdc_acces_seccount = 1055 (get_head_settle_flag() | 1056 (rwflag ? FDCCMD_WRSEC : (FDCCMD_RDSEC | (read_track ? FDCCMDADD_M : 0)))); 1057 1058 old_motoron = MotorOn; 1059 MotorOn = 1; 1060 NeedSeek = 1; 1061 /* wait for interrupt */ 1062 1063 if (read_track) { 1064 /* If reading a whole track, wait about one disk rotation and 1065 * then check if all sectors are read. The FDC will even 1066 * search for the first non-existent sector and need 1 sec to 1067 * recognise that it isn't present :-( 1068 */ 1069 MultReadInProgress = 1; 1070 mod_timer(&readtrack_timer, 1071 /* 1 rot. + 5 rot.s if motor was off */ 1072 jiffies + HZ/5 + (old_motoron ? 0 : HZ)); 1073 } 1074 start_timeout(); 1075} 1076 1077 1078static void fd_readtrack_check(struct timer_list *unused) 1079{ 1080 unsigned long flags, addr, addr2; 1081 1082 local_irq_save(flags); 1083 1084 if (!MultReadInProgress) { 1085 /* This prevents a race condition that could arise if the 1086 * interrupt is triggered while the calling of this timer 1087 * callback function takes place. The IRQ function then has 1088 * already cleared 'MultReadInProgress' when flow of control 1089 * gets here. 1090 */ 1091 local_irq_restore(flags); 1092 return; 1093 } 1094 1095 /* get the current DMA address */ 1096 /* ++ f.a. read twice to avoid being fooled by switcher */ 1097 addr = 0; 1098 do { 1099 addr2 = addr; 1100 addr = dma_wd.dma_lo & 0xff; 1101 MFPDELAY(); 1102 addr |= (dma_wd.dma_md & 0xff) << 8; 1103 MFPDELAY(); 1104 if (ATARIHW_PRESENT( EXTD_DMA )) 1105 addr |= (st_dma_ext_dmahi & 0xffff) << 16; 1106 else 1107 addr |= (dma_wd.dma_hi & 0xff) << 16; 1108 MFPDELAY(); 1109 } while(addr != addr2); 1110 1111 if (addr >= PhysTrackBuffer + SUDT->spt*512) { 1112 /* already read enough data, force an FDC interrupt to stop 1113 * the read operation 1114 */ 1115 SET_IRQ_HANDLER( NULL ); 1116 MultReadInProgress = 0; 1117 local_irq_restore(flags); 1118 DPRINT(("fd_readtrack_check(): done\n")); 1119 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI ); 1120 udelay(25); 1121 1122 /* No error until now -- the FDC would have interrupted 1123 * otherwise! 1124 */ 1125 fd_rwsec_done1(0); 1126 } 1127 else { 1128 /* not yet finished, wait another tenth rotation */ 1129 local_irq_restore(flags); 1130 DPRINT(("fd_readtrack_check(): not yet finished\n")); 1131 mod_timer(&readtrack_timer, jiffies + HZ/5/10); 1132 } 1133} 1134 1135 1136static void fd_rwsec_done( int status ) 1137{ 1138 DPRINT(("fd_rwsec_done()\n")); 1139 1140 if (read_track) { 1141 timer_delete(&readtrack_timer); 1142 if (!MultReadInProgress) 1143 return; 1144 MultReadInProgress = 0; 1145 } 1146 fd_rwsec_done1(status); 1147} 1148 1149static void fd_rwsec_done1(int status) 1150{ 1151 unsigned int track; 1152 1153 stop_timeout(); 1154 1155 /* Correct the track if stretch != 0 */ 1156 if (SUDT->stretch) { 1157 track = FDC_READ( FDCREG_TRACK); 1158 MFPDELAY(); 1159 FDC_WRITE( FDCREG_TRACK, track << SUDT->stretch); 1160 } 1161 1162 if (!UseTrackbuffer) { 1163 dma_wd.dma_mode_status = 0x90; 1164 MFPDELAY(); 1165 if (!(dma_wd.dma_mode_status & 0x01)) { 1166 printk(KERN_ERR "fd%d: DMA error\n", SelectedDrive ); 1167 goto err_end; 1168 } 1169 } 1170 MFPDELAY(); 1171 1172 if (ReqCmd == WRITE && (status & FDCSTAT_WPROT)) { 1173 printk(KERN_NOTICE "fd%d: is write protected\n", SelectedDrive ); 1174 goto err_end; 1175 } 1176 if ((status & FDCSTAT_RECNF) && 1177 /* RECNF is no error after a multiple read when the FDC 1178 searched for a non-existent sector! */ 1179 !(read_track && FDC_READ(FDCREG_SECTOR) > SUDT->spt)) { 1180 if (Probing) { 1181 if (SUDT > atari_disk_type) { 1182 if (SUDT[-1].blocks > ReqBlock) { 1183 /* try another disk type */ 1184 SUDT--; 1185 set_capacity(unit[SelectedDrive].disk[0], 1186 SUDT->blocks); 1187 } else 1188 Probing = 0; 1189 } 1190 else { 1191 if (SUD.flags & FTD_MSG) 1192 printk(KERN_INFO "fd%d: Auto-detected floppy type %s\n", 1193 SelectedDrive, SUDT->name ); 1194 Probing=0; 1195 } 1196 } else { 1197/* record not found, but not probing. Maybe stretch wrong ? Restart probing */ 1198 if (SUD.autoprobe) { 1199 SUDT = atari_disk_type + StartDiskType[DriveType]; 1200 set_capacity(unit[SelectedDrive].disk[0], 1201 SUDT->blocks); 1202 Probing = 1; 1203 } 1204 } 1205 if (Probing) { 1206 if (ATARIHW_PRESENT(FDCSPEED)) { 1207 dma_wd.fdc_speed = SUDT->fdc_speed; 1208 MFPDELAY(); 1209 } 1210 setup_req_params( SelectedDrive ); 1211 BufferDrive = -1; 1212 do_fd_action( SelectedDrive ); 1213 return; 1214 } 1215 1216 printk(KERN_ERR "fd%d: sector %d not found (side %d, track %d)\n", 1217 SelectedDrive, FDC_READ (FDCREG_SECTOR), ReqSide, ReqTrack ); 1218 goto err_end; 1219 } 1220 if (status & FDCSTAT_CRC) { 1221 printk(KERN_ERR "fd%d: CRC error (side %d, track %d, sector %d)\n", 1222 SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) ); 1223 goto err_end; 1224 } 1225 if (status & FDCSTAT_LOST) { 1226 printk(KERN_ERR "fd%d: lost data (side %d, track %d, sector %d)\n", 1227 SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) ); 1228 goto err_end; 1229 } 1230 1231 Probing = 0; 1232 1233 if (ReqCmd == READ) { 1234 if (!read_track) { 1235 void *addr; 1236 addr = ATARIHW_PRESENT( EXTD_DMA ) ? ReqData : DMABuffer; 1237 dma_cache_maintenance( virt_to_phys(addr), 512, 0 ); 1238 if (!ATARIHW_PRESENT( EXTD_DMA )) 1239 copy_buffer (addr, ReqData); 1240 } else { 1241 dma_cache_maintenance( PhysTrackBuffer, MaxSectors[DriveType] * 512, 0 ); 1242 BufferDrive = SelectedDrive; 1243 BufferSide = ReqSide; 1244 BufferTrack = ReqTrack; 1245 copy_buffer (SECTOR_BUFFER (ReqSector), ReqData); 1246 } 1247 } 1248 1249 if (++ReqCnt < blk_rq_cur_sectors(fd_request)) { 1250 /* read next sector */ 1251 setup_req_params( SelectedDrive ); 1252 do_fd_action( SelectedDrive ); 1253 } 1254 else { 1255 /* all sectors finished */ 1256 fd_end_request_cur(BLK_STS_OK); 1257 finish_fdc(); 1258 } 1259 return; 1260 1261 err_end: 1262 BufferDrive = -1; 1263 fd_error(); 1264} 1265 1266 1267static void fd_writetrack( void ) 1268{ 1269 unsigned long paddr, flags; 1270 unsigned int track; 1271 1272 DPRINT(("fd_writetrack() Tr=%d Si=%d\n", ReqTrack, ReqSide )); 1273 1274 paddr = PhysTrackBuffer; 1275 dma_cache_maintenance( paddr, BUFFER_SIZE, 1 ); 1276 1277 fd_select_side( ReqSide ); 1278 1279 /* Cheat for track if stretch != 0 */ 1280 if (SUDT->stretch) { 1281 track = FDC_READ( FDCREG_TRACK); 1282 MFPDELAY(); 1283 FDC_WRITE(FDCREG_TRACK,track >> SUDT->stretch); 1284 } 1285 udelay(40); 1286 1287 /* Setup DMA */ 1288 local_irq_save(flags); 1289 dma_wd.dma_lo = (unsigned char)paddr; 1290 MFPDELAY(); 1291 paddr >>= 8; 1292 dma_wd.dma_md = (unsigned char)paddr; 1293 MFPDELAY(); 1294 paddr >>= 8; 1295 if (ATARIHW_PRESENT( EXTD_DMA )) 1296 st_dma_ext_dmahi = (unsigned short)paddr; 1297 else 1298 dma_wd.dma_hi = (unsigned char)paddr; 1299 MFPDELAY(); 1300 local_irq_restore(flags); 1301 1302 /* Clear FIFO and switch DMA to correct mode */ 1303 dma_wd.dma_mode_status = 0x190; 1304 MFPDELAY(); 1305 dma_wd.dma_mode_status = 0x90; 1306 MFPDELAY(); 1307 dma_wd.dma_mode_status = 0x190; 1308 MFPDELAY(); 1309 1310 /* How many sectors for DMA */ 1311 dma_wd.fdc_acces_seccount = BUFFER_SIZE/512; 1312 udelay(40); 1313 1314 /* Start operation */ 1315 dma_wd.dma_mode_status = FDCSELREG_STP | 0x100; 1316 udelay(40); 1317 SET_IRQ_HANDLER( fd_writetrack_done ); 1318 dma_wd.fdc_acces_seccount = FDCCMD_WRTRA | get_head_settle_flag(); 1319 1320 MotorOn = 1; 1321 start_timeout(); 1322 /* wait for interrupt */ 1323} 1324 1325 1326static void fd_writetrack_done( int status ) 1327{ 1328 DPRINT(("fd_writetrack_done()\n")); 1329 1330 stop_timeout(); 1331 1332 if (status & FDCSTAT_WPROT) { 1333 printk(KERN_NOTICE "fd%d: is write protected\n", SelectedDrive ); 1334 goto err_end; 1335 } 1336 if (status & FDCSTAT_LOST) { 1337 printk(KERN_ERR "fd%d: lost data (side %d, track %d)\n", 1338 SelectedDrive, ReqSide, ReqTrack ); 1339 goto err_end; 1340 } 1341 1342 complete(&format_wait); 1343 return; 1344 1345 err_end: 1346 fd_error(); 1347} 1348 1349static void fd_times_out(struct timer_list *unused) 1350{ 1351 atari_disable_irq( IRQ_MFP_FDC ); 1352 if (!FloppyIRQHandler) goto end; /* int occurred after timer was fired, but 1353 * before we came here... */ 1354 1355 SET_IRQ_HANDLER( NULL ); 1356 /* If the timeout occurred while the readtrack_check timer was 1357 * active, we need to cancel it, else bad things will happen */ 1358 if (UseTrackbuffer) 1359 timer_delete(&readtrack_timer); 1360 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI ); 1361 udelay( 25 ); 1362 1363 printk(KERN_ERR "floppy timeout\n" ); 1364 fd_error(); 1365 end: 1366 atari_enable_irq( IRQ_MFP_FDC ); 1367} 1368 1369 1370/* The (noop) seek operation here is needed to make the WP bit in the 1371 * FDC status register accessible for check_change. If the last disk 1372 * operation would have been a RDSEC, this bit would always read as 0 1373 * no matter what :-( To save time, the seek goes to the track we're 1374 * already on. 1375 */ 1376 1377static void finish_fdc( void ) 1378{ 1379 if (!NeedSeek || !stdma_is_locked_by(floppy_irq)) { 1380 finish_fdc_done( 0 ); 1381 } 1382 else { 1383 DPRINT(("finish_fdc: dummy seek started\n")); 1384 FDC_WRITE (FDCREG_DATA, SUD.track); 1385 SET_IRQ_HANDLER( finish_fdc_done ); 1386 FDC_WRITE (FDCREG_CMD, FDCCMD_SEEK); 1387 MotorOn = 1; 1388 start_timeout(); 1389 /* we must wait for the IRQ here, because the ST-DMA 1390 is released immediately afterwards and the interrupt 1391 may be delivered to the wrong driver. */ 1392 } 1393} 1394 1395 1396static void finish_fdc_done( int dummy ) 1397{ 1398 unsigned long flags; 1399 1400 DPRINT(("finish_fdc_done entered\n")); 1401 stop_timeout(); 1402 NeedSeek = 0; 1403 1404 if (timer_pending(&fd_timer) && time_before(fd_timer.expires, jiffies + 5)) 1405 /* If the check for a disk change is done too early after this 1406 * last seek command, the WP bit still reads wrong :-(( 1407 */ 1408 mod_timer(&fd_timer, jiffies + 5); 1409 else 1410 start_check_change_timer(); 1411 start_motor_off_timer(); 1412 1413 local_irq_save(flags); 1414 if (stdma_is_locked_by(floppy_irq)) 1415 stdma_release(); 1416 local_irq_restore(flags); 1417 1418 DPRINT(("finish_fdc() finished\n")); 1419} 1420 1421/* The detection of disk changes is a dark chapter in Atari history :-( 1422 * Because the "Drive ready" signal isn't present in the Atari 1423 * hardware, one has to rely on the "Write Protect". This works fine, 1424 * as long as no write protected disks are used. TOS solves this 1425 * problem by introducing tri-state logic ("maybe changed") and 1426 * looking at the serial number in block 0. This isn't possible for 1427 * Linux, since the floppy driver can't make assumptions about the 1428 * filesystem used on the disk and thus the contents of block 0. I've 1429 * chosen the method to always say "The disk was changed" if it is 1430 * unsure whether it was. This implies that every open or mount 1431 * invalidates the disk buffers if you work with write protected 1432 * disks. But at least this is better than working with incorrect data 1433 * due to unrecognised disk changes. 1434 */ 1435 1436static unsigned int floppy_check_events(struct gendisk *disk, 1437 unsigned int clearing) 1438{ 1439 struct atari_floppy_struct *p = disk->private_data; 1440 unsigned int drive = p - unit; 1441 if (test_bit (drive, &fake_change)) { 1442 /* simulated change (e.g. after formatting) */ 1443 return DISK_EVENT_MEDIA_CHANGE; 1444 } 1445 if (test_bit (drive, &changed_floppies)) { 1446 /* surely changed (the WP signal changed at least once) */ 1447 return DISK_EVENT_MEDIA_CHANGE; 1448 } 1449 if (UD.wpstat) { 1450 /* WP is on -> could be changed: to be sure, buffers should be 1451 * invalidated... 1452 */ 1453 return DISK_EVENT_MEDIA_CHANGE; 1454 } 1455 1456 return 0; 1457} 1458 1459static int floppy_revalidate(struct gendisk *disk) 1460{ 1461 struct atari_floppy_struct *p = disk->private_data; 1462 unsigned int drive = p - unit; 1463 1464 if (test_bit(drive, &changed_floppies) || 1465 test_bit(drive, &fake_change) || !p->disktype) { 1466 if (UD.flags & FTD_MSG) 1467 printk(KERN_ERR "floppy: clear format %p!\n", UDT); 1468 BufferDrive = -1; 1469 clear_bit(drive, &fake_change); 1470 clear_bit(drive, &changed_floppies); 1471 /* MSch: clearing geometry makes sense only for autoprobe 1472 formats, for 'permanent user-defined' parameter: 1473 restore default_params[] here if flagged valid! */ 1474 if (default_params[drive].blocks == 0) 1475 UDT = NULL; 1476 else 1477 UDT = &default_params[drive]; 1478 } 1479 return 0; 1480} 1481 1482 1483/* This sets up the global variables describing the current request. */ 1484 1485static void setup_req_params( int drive ) 1486{ 1487 int block = ReqBlock + ReqCnt; 1488 1489 ReqTrack = block / UDT->spt; 1490 ReqSector = block - ReqTrack * UDT->spt + 1; 1491 ReqSide = ReqTrack & 1; 1492 ReqTrack >>= 1; 1493 ReqData = ReqBuffer + 512 * ReqCnt; 1494 1495 if (UseTrackbuffer) 1496 read_track = (ReqCmd == READ && unit[drive].error_count == 0); 1497 else 1498 read_track = 0; 1499 1500 DPRINT(("Request params: Si=%d Tr=%d Se=%d Data=%08lx\n",ReqSide, 1501 ReqTrack, ReqSector, (unsigned long)ReqData )); 1502} 1503 1504static blk_status_t ataflop_queue_rq(struct blk_mq_hw_ctx *hctx, 1505 const struct blk_mq_queue_data *bd) 1506{ 1507 struct atari_floppy_struct *floppy = bd->rq->q->disk->private_data; 1508 int drive = floppy - unit; 1509 int type = floppy->type; 1510 1511 DPRINT(("Queue request: drive %d type %d sectors %d of %d last %d\n", 1512 drive, type, blk_rq_cur_sectors(bd->rq), 1513 blk_rq_sectors(bd->rq), bd->last)); 1514 1515 spin_lock_irq(&ataflop_lock); 1516 if (fd_request) { 1517 spin_unlock_irq(&ataflop_lock); 1518 return BLK_STS_DEV_RESOURCE; 1519 } 1520 if (!stdma_try_lock(floppy_irq, NULL)) { 1521 spin_unlock_irq(&ataflop_lock); 1522 return BLK_STS_RESOURCE; 1523 } 1524 fd_request = bd->rq; 1525 unit[drive].error_count = 0; 1526 blk_mq_start_request(fd_request); 1527 1528 atari_disable_irq( IRQ_MFP_FDC ); 1529 1530 IsFormatting = 0; 1531 1532 if (!UD.connected) { 1533 /* drive not connected */ 1534 printk(KERN_ERR "Unknown Device: fd%d\n", drive ); 1535 fd_end_request_cur(BLK_STS_IOERR); 1536 stdma_release(); 1537 goto out; 1538 } 1539 1540 if (type == 0) { 1541 if (!UDT) { 1542 Probing = 1; 1543 UDT = atari_disk_type + StartDiskType[DriveType]; 1544 set_capacity(bd->rq->q->disk, UDT->blocks); 1545 UD.autoprobe = 1; 1546 } 1547 } 1548 else { 1549 /* user supplied disk type */ 1550 if (--type >= NUM_DISK_MINORS) { 1551 printk(KERN_WARNING "fd%d: invalid disk format", drive ); 1552 fd_end_request_cur(BLK_STS_IOERR); 1553 stdma_release(); 1554 goto out; 1555 } 1556 if (minor2disktype[type].drive_types > DriveType) { 1557 printk(KERN_WARNING "fd%d: unsupported disk format", drive ); 1558 fd_end_request_cur(BLK_STS_IOERR); 1559 stdma_release(); 1560 goto out; 1561 } 1562 type = minor2disktype[type].index; 1563 UDT = &atari_disk_type[type]; 1564 set_capacity(bd->rq->q->disk, UDT->blocks); 1565 UD.autoprobe = 0; 1566 } 1567 1568 /* stop deselect timer */ 1569 timer_delete(&motor_off_timer); 1570 1571 ReqCnt = 0; 1572 ReqCmd = rq_data_dir(fd_request); 1573 ReqBlock = blk_rq_pos(fd_request); 1574 ReqBuffer = bio_data(fd_request->bio); 1575 setup_req_params( drive ); 1576 do_fd_action( drive ); 1577 1578 atari_enable_irq( IRQ_MFP_FDC ); 1579 1580out: 1581 spin_unlock_irq(&ataflop_lock); 1582 return BLK_STS_OK; 1583} 1584 1585static int fd_locked_ioctl(struct block_device *bdev, blk_mode_t mode, 1586 unsigned int cmd, unsigned long param) 1587{ 1588 struct gendisk *disk = bdev->bd_disk; 1589 struct atari_floppy_struct *floppy = disk->private_data; 1590 int drive = floppy - unit; 1591 int type = floppy->type; 1592 struct atari_format_descr fmt_desc; 1593 struct atari_disk_type *dtp; 1594 struct floppy_struct getprm; 1595 int settype; 1596 struct floppy_struct setprm; 1597 void __user *argp = (void __user *)param; 1598 1599 switch (cmd) { 1600 case FDGETPRM: 1601 if (type) { 1602 if (--type >= NUM_DISK_MINORS) 1603 return -ENODEV; 1604 if (minor2disktype[type].drive_types > DriveType) 1605 return -ENODEV; 1606 type = minor2disktype[type].index; 1607 dtp = &atari_disk_type[type]; 1608 if (UD.flags & FTD_MSG) 1609 printk (KERN_ERR "floppy%d: found dtp %p name %s!\n", 1610 drive, dtp, dtp->name); 1611 } 1612 else { 1613 if (!UDT) 1614 return -ENXIO; 1615 else 1616 dtp = UDT; 1617 } 1618 memset((void *)&getprm, 0, sizeof(getprm)); 1619 getprm.size = dtp->blocks; 1620 getprm.sect = dtp->spt; 1621 getprm.head = 2; 1622 getprm.track = dtp->blocks/dtp->spt/2; 1623 getprm.stretch = dtp->stretch; 1624 if (copy_to_user(argp, &getprm, sizeof(getprm))) 1625 return -EFAULT; 1626 return 0; 1627 } 1628 switch (cmd) { 1629 case FDSETPRM: 1630 case FDDEFPRM: 1631 /* 1632 * MSch 7/96: simple 'set geometry' case: just set the 1633 * 'default' device params (minor == 0). 1634 * Currently, the drive geometry is cleared after each 1635 * disk change and subsequent revalidate()! simple 1636 * implementation of FDDEFPRM: save geometry from a 1637 * FDDEFPRM call and restore it in floppy_revalidate() ! 1638 */ 1639 1640 /* get the parameters from user space */ 1641 if (floppy->ref != 1 && floppy->ref != -1) 1642 return -EBUSY; 1643 if (copy_from_user(&setprm, argp, sizeof(setprm))) 1644 return -EFAULT; 1645 /* 1646 * first of all: check for floppy change and revalidate, 1647 * or the next access will revalidate - and clear UDT :-( 1648 */ 1649 1650 if (floppy_check_events(disk, 0)) 1651 floppy_revalidate(disk); 1652 1653 if (UD.flags & FTD_MSG) 1654 printk (KERN_INFO "floppy%d: setting size %d spt %d str %d!\n", 1655 drive, setprm.size, setprm.sect, setprm.stretch); 1656 1657 /* what if type > 0 here? Overwrite specified entry ? */ 1658 if (type) { 1659 /* refuse to re-set a predefined type for now */ 1660 finish_fdc(); 1661 return -EINVAL; 1662 } 1663 1664 /* 1665 * type == 0: first look for a matching entry in the type list, 1666 * and set the UD.disktype field to use the perdefined entry. 1667 * TODO: add user-defined format to head of autoprobe list ? 1668 * Useful to include the user-type for future autodetection! 1669 */ 1670 1671 for (settype = 0; settype < NUM_DISK_MINORS; settype++) { 1672 int setidx = 0; 1673 if (minor2disktype[settype].drive_types > DriveType) { 1674 /* skip this one, invalid for drive ... */ 1675 continue; 1676 } 1677 setidx = minor2disktype[settype].index; 1678 dtp = &atari_disk_type[setidx]; 1679 1680 /* found matching entry ?? */ 1681 if ( dtp->blocks == setprm.size 1682 && dtp->spt == setprm.sect 1683 && dtp->stretch == setprm.stretch ) { 1684 if (UD.flags & FTD_MSG) 1685 printk (KERN_INFO "floppy%d: setting %s %p!\n", 1686 drive, dtp->name, dtp); 1687 UDT = dtp; 1688 set_capacity(disk, UDT->blocks); 1689 1690 if (cmd == FDDEFPRM) { 1691 /* save settings as permanent default type */ 1692 default_params[drive].name = dtp->name; 1693 default_params[drive].spt = dtp->spt; 1694 default_params[drive].blocks = dtp->blocks; 1695 default_params[drive].fdc_speed = dtp->fdc_speed; 1696 default_params[drive].stretch = dtp->stretch; 1697 } 1698 1699 return 0; 1700 } 1701 1702 } 1703 1704 /* no matching disk type found above - setting user_params */ 1705 1706 if (cmd == FDDEFPRM) { 1707 /* set permanent type */ 1708 dtp = &default_params[drive]; 1709 } else 1710 /* set user type (reset by disk change!) */ 1711 dtp = &user_params[drive]; 1712 1713 dtp->name = "user format"; 1714 dtp->blocks = setprm.size; 1715 dtp->spt = setprm.sect; 1716 if (setprm.sect > 14) 1717 dtp->fdc_speed = 3; 1718 else 1719 dtp->fdc_speed = 0; 1720 dtp->stretch = setprm.stretch; 1721 1722 if (UD.flags & FTD_MSG) 1723 printk (KERN_INFO "floppy%d: blk %d spt %d str %d!\n", 1724 drive, dtp->blocks, dtp->spt, dtp->stretch); 1725 1726 /* sanity check */ 1727 if (setprm.track != dtp->blocks/dtp->spt/2 || 1728 setprm.head != 2) { 1729 finish_fdc(); 1730 return -EINVAL; 1731 } 1732 1733 UDT = dtp; 1734 set_capacity(disk, UDT->blocks); 1735 1736 return 0; 1737 case FDMSGON: 1738 UD.flags |= FTD_MSG; 1739 return 0; 1740 case FDMSGOFF: 1741 UD.flags &= ~FTD_MSG; 1742 return 0; 1743 case FDSETEMSGTRESH: 1744 return -EINVAL; 1745 case FDFMTBEG: 1746 return 0; 1747 case FDFMTTRK: 1748 if (floppy->ref != 1 && floppy->ref != -1) 1749 return -EBUSY; 1750 if (copy_from_user(&fmt_desc, argp, sizeof(fmt_desc))) 1751 return -EFAULT; 1752 return do_format(drive, type, &fmt_desc); 1753 case FDCLRPRM: 1754 UDT = NULL; 1755 /* MSch: invalidate default_params */ 1756 default_params[drive].blocks = 0; 1757 set_capacity(disk, MAX_DISK_SIZE * 2); 1758 fallthrough; 1759 case FDFMTEND: 1760 case FDFLUSH: 1761 /* invalidate the buffer track to force a reread */ 1762 BufferDrive = -1; 1763 set_bit(drive, &fake_change); 1764 if (disk_check_media_change(disk)) { 1765 bdev_mark_dead(disk->part0, true); 1766 floppy_revalidate(disk); 1767 } 1768 return 0; 1769 default: 1770 return -EINVAL; 1771 } 1772} 1773 1774static int fd_ioctl(struct block_device *bdev, blk_mode_t mode, 1775 unsigned int cmd, unsigned long arg) 1776{ 1777 int ret; 1778 1779 mutex_lock(&ataflop_mutex); 1780 ret = fd_locked_ioctl(bdev, mode, cmd, arg); 1781 mutex_unlock(&ataflop_mutex); 1782 1783 return ret; 1784} 1785 1786/* Initialize the 'unit' variable for drive 'drive' */ 1787 1788static void __init fd_probe( int drive ) 1789{ 1790 UD.connected = 0; 1791 UDT = NULL; 1792 1793 if (!fd_test_drive_present( drive )) 1794 return; 1795 1796 UD.connected = 1; 1797 UD.track = 0; 1798 switch( UserSteprate[drive] ) { 1799 case 2: 1800 UD.steprate = FDCSTEP_2; 1801 break; 1802 case 3: 1803 UD.steprate = FDCSTEP_3; 1804 break; 1805 case 6: 1806 UD.steprate = FDCSTEP_6; 1807 break; 1808 case 12: 1809 UD.steprate = FDCSTEP_12; 1810 break; 1811 default: /* should be -1 for "not set by user" */ 1812 if (ATARIHW_PRESENT( FDCSPEED ) || MACH_IS_MEDUSA) 1813 UD.steprate = FDCSTEP_3; 1814 else 1815 UD.steprate = FDCSTEP_6; 1816 break; 1817 } 1818 MotorOn = 1; /* from probe restore operation! */ 1819} 1820 1821 1822/* This function tests the physical presence of a floppy drive (not 1823 * whether a disk is inserted). This is done by issuing a restore 1824 * command, waiting max. 2 seconds (that should be enough to move the 1825 * head across the whole disk) and looking at the state of the "TR00" 1826 * signal. This should now be raised if there is a drive connected 1827 * (and there is no hardware failure :-) Otherwise, the drive is 1828 * declared absent. 1829 */ 1830 1831static int __init fd_test_drive_present( int drive ) 1832{ 1833 unsigned long timeout; 1834 unsigned char status; 1835 int ok; 1836 1837 if (drive >= (MACH_IS_FALCON ? 1 : 2)) return( 0 ); 1838 fd_select_drive( drive ); 1839 1840 /* disable interrupt temporarily */ 1841 atari_turnoff_irq( IRQ_MFP_FDC ); 1842 FDC_WRITE (FDCREG_TRACK, 0xff00); 1843 FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | FDCCMDADD_H | FDCSTEP_6 ); 1844 1845 timeout = jiffies + 2*HZ+HZ/2; 1846 while (time_before(jiffies, timeout)) 1847 if (!(st_mfp.par_dt_reg & 0x20)) 1848 break; 1849 1850 status = FDC_READ( FDCREG_STATUS ); 1851 ok = (status & FDCSTAT_TR00) != 0; 1852 1853 /* force interrupt to abort restore operation (FDC would try 1854 * about 50 seconds!) */ 1855 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI ); 1856 udelay(500); 1857 status = FDC_READ( FDCREG_STATUS ); 1858 udelay(20); 1859 1860 if (ok) { 1861 /* dummy seek command to make WP bit accessible */ 1862 FDC_WRITE( FDCREG_DATA, 0 ); 1863 FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK ); 1864 while( st_mfp.par_dt_reg & 0x20 ) 1865 ; 1866 status = FDC_READ( FDCREG_STATUS ); 1867 } 1868 1869 atari_turnon_irq( IRQ_MFP_FDC ); 1870 return( ok ); 1871} 1872 1873 1874/* Look how many and which kind of drives are connected. If there are 1875 * floppies, additionally start the disk-change and motor-off timers. 1876 */ 1877 1878static void __init config_types( void ) 1879{ 1880 int drive, cnt = 0; 1881 1882 /* for probing drives, set the FDC speed to 8 MHz */ 1883 if (ATARIHW_PRESENT(FDCSPEED)) 1884 dma_wd.fdc_speed = 0; 1885 1886 printk(KERN_INFO "Probing floppy drive(s):\n"); 1887 for( drive = 0; drive < FD_MAX_UNITS; drive++ ) { 1888 fd_probe( drive ); 1889 if (UD.connected) { 1890 printk(KERN_INFO "fd%d\n", drive); 1891 ++cnt; 1892 } 1893 } 1894 1895 if (FDC_READ( FDCREG_STATUS ) & FDCSTAT_BUSY) { 1896 /* If FDC is still busy from probing, give it another FORCI 1897 * command to abort the operation. If this isn't done, the FDC 1898 * will interrupt later and its IRQ line stays low, because 1899 * the status register isn't read. And this will block any 1900 * interrupts on this IRQ line :-( 1901 */ 1902 FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI ); 1903 udelay(500); 1904 FDC_READ( FDCREG_STATUS ); 1905 udelay(20); 1906 } 1907 1908 if (cnt > 0) { 1909 start_motor_off_timer(); 1910 if (cnt == 1) fd_select_drive( 0 ); 1911 start_check_change_timer(); 1912 } 1913} 1914 1915/* 1916 * floppy_open check for aliasing (/dev/fd0 can be the same as 1917 * /dev/PS0 etc), and disallows simultaneous access to the same 1918 * drive with different device numbers. 1919 */ 1920 1921static int floppy_open(struct gendisk *disk, blk_mode_t mode) 1922{ 1923 struct atari_floppy_struct *p = disk->private_data; 1924 int type = disk->first_minor >> 2; 1925 1926 DPRINT(("fd_open: type=%d\n",type)); 1927 if (p->ref && p->type != type) 1928 return -EBUSY; 1929 1930 if (p->ref == -1 || (p->ref && mode & BLK_OPEN_EXCL)) 1931 return -EBUSY; 1932 if (mode & BLK_OPEN_EXCL) 1933 p->ref = -1; 1934 else 1935 p->ref++; 1936 1937 p->type = type; 1938 1939 if (mode & BLK_OPEN_NDELAY) 1940 return 0; 1941 1942 if (mode & (BLK_OPEN_READ | BLK_OPEN_WRITE)) { 1943 if (disk_check_media_change(disk)) 1944 floppy_revalidate(disk); 1945 if (mode & BLK_OPEN_WRITE) { 1946 if (p->wpstat) { 1947 if (p->ref < 0) 1948 p->ref = 0; 1949 else 1950 p->ref--; 1951 return -EROFS; 1952 } 1953 } 1954 } 1955 return 0; 1956} 1957 1958static int floppy_unlocked_open(struct gendisk *disk, blk_mode_t mode) 1959{ 1960 int ret; 1961 1962 mutex_lock(&ataflop_mutex); 1963 ret = floppy_open(disk, mode); 1964 mutex_unlock(&ataflop_mutex); 1965 1966 return ret; 1967} 1968 1969static void floppy_release(struct gendisk *disk) 1970{ 1971 struct atari_floppy_struct *p = disk->private_data; 1972 mutex_lock(&ataflop_mutex); 1973 if (p->ref < 0) 1974 p->ref = 0; 1975 else if (!p->ref--) { 1976 printk(KERN_ERR "floppy_release with fd_ref == 0"); 1977 p->ref = 0; 1978 } 1979 mutex_unlock(&ataflop_mutex); 1980} 1981 1982static const struct block_device_operations floppy_fops = { 1983 .owner = THIS_MODULE, 1984 .open = floppy_unlocked_open, 1985 .release = floppy_release, 1986 .ioctl = fd_ioctl, 1987 .check_events = floppy_check_events, 1988}; 1989 1990static const struct blk_mq_ops ataflop_mq_ops = { 1991 .queue_rq = ataflop_queue_rq, 1992}; 1993 1994static int ataflop_alloc_disk(unsigned int drive, unsigned int type) 1995{ 1996 struct queue_limits lim = { 1997 .features = BLK_FEAT_ROTATIONAL, 1998 }; 1999 struct gendisk *disk; 2000 2001 disk = blk_mq_alloc_disk(&unit[drive].tag_set, &lim, NULL); 2002 if (IS_ERR(disk)) 2003 return PTR_ERR(disk); 2004 2005 disk->major = FLOPPY_MAJOR; 2006 disk->first_minor = drive + (type << 2); 2007 disk->minors = 1; 2008 sprintf(disk->disk_name, "fd%d", drive); 2009 disk->fops = &floppy_fops; 2010 disk->flags |= GENHD_FL_NO_PART; 2011 disk->events = DISK_EVENT_MEDIA_CHANGE; 2012 disk->private_data = &unit[drive]; 2013 set_capacity(disk, MAX_DISK_SIZE * 2); 2014 2015 unit[drive].disk[type] = disk; 2016 return 0; 2017} 2018 2019static void ataflop_probe(dev_t dev) 2020{ 2021 int drive = MINOR(dev) & 3; 2022 int type = MINOR(dev) >> 2; 2023 2024 if (type) 2025 type--; 2026 2027 if (drive >= FD_MAX_UNITS || type >= NUM_DISK_MINORS) 2028 return; 2029 if (unit[drive].disk[type]) 2030 return; 2031 if (ataflop_alloc_disk(drive, type)) 2032 return; 2033 if (add_disk(unit[drive].disk[type])) 2034 goto cleanup_disk; 2035 unit[drive].registered[type] = true; 2036 return; 2037 2038cleanup_disk: 2039 put_disk(unit[drive].disk[type]); 2040 unit[drive].disk[type] = NULL; 2041} 2042 2043static void atari_floppy_cleanup(void) 2044{ 2045 int i; 2046 int type; 2047 2048 for (i = 0; i < FD_MAX_UNITS; i++) { 2049 for (type = 0; type < NUM_DISK_MINORS; type++) { 2050 if (!unit[i].disk[type]) 2051 continue; 2052 del_gendisk(unit[i].disk[type]); 2053 put_disk(unit[i].disk[type]); 2054 } 2055 blk_mq_free_tag_set(&unit[i].tag_set); 2056 } 2057 2058 timer_delete_sync(&fd_timer); 2059 atari_stram_free(DMABuffer); 2060} 2061 2062static void atari_cleanup_floppy_disk(struct atari_floppy_struct *fs) 2063{ 2064 int type; 2065 2066 for (type = 0; type < NUM_DISK_MINORS; type++) { 2067 if (!fs->disk[type]) 2068 continue; 2069 if (fs->registered[type]) 2070 del_gendisk(fs->disk[type]); 2071 put_disk(fs->disk[type]); 2072 } 2073 blk_mq_free_tag_set(&fs->tag_set); 2074} 2075 2076static int __init atari_floppy_init (void) 2077{ 2078 int i; 2079 int ret; 2080 2081 if (!MACH_IS_ATARI) 2082 /* Amiga, Mac, ... don't have Atari-compatible floppy :-) */ 2083 return -ENODEV; 2084 2085 for (i = 0; i < FD_MAX_UNITS; i++) { 2086 memset(&unit[i].tag_set, 0, sizeof(unit[i].tag_set)); 2087 unit[i].tag_set.ops = &ataflop_mq_ops; 2088 unit[i].tag_set.nr_hw_queues = 1; 2089 unit[i].tag_set.nr_maps = 1; 2090 unit[i].tag_set.queue_depth = 2; 2091 unit[i].tag_set.numa_node = NUMA_NO_NODE; 2092 ret = blk_mq_alloc_tag_set(&unit[i].tag_set); 2093 if (ret) 2094 goto err; 2095 2096 ret = ataflop_alloc_disk(i, 0); 2097 if (ret) { 2098 blk_mq_free_tag_set(&unit[i].tag_set); 2099 goto err; 2100 } 2101 } 2102 2103 if (UseTrackbuffer < 0) 2104 /* not set by user -> use default: for now, we turn 2105 track buffering off for all Medusas, though it 2106 could be used with ones that have a counter 2107 card. But the test is too hard :-( */ 2108 UseTrackbuffer = !MACH_IS_MEDUSA; 2109 2110 /* initialize variables */ 2111 SelectedDrive = -1; 2112 BufferDrive = -1; 2113 2114 DMABuffer = atari_stram_alloc(BUFFER_SIZE+512, "ataflop"); 2115 if (!DMABuffer) { 2116 printk(KERN_ERR "atari_floppy_init: cannot get dma buffer\n"); 2117 ret = -ENOMEM; 2118 goto err; 2119 } 2120 TrackBuffer = DMABuffer + 512; 2121 PhysDMABuffer = atari_stram_to_phys(DMABuffer); 2122 PhysTrackBuffer = virt_to_phys(TrackBuffer); 2123 BufferDrive = BufferSide = BufferTrack = -1; 2124 2125 for (i = 0; i < FD_MAX_UNITS; i++) { 2126 unit[i].track = -1; 2127 unit[i].flags = 0; 2128 ret = add_disk(unit[i].disk[0]); 2129 if (ret) 2130 goto err_out_dma; 2131 unit[i].registered[0] = true; 2132 } 2133 2134 printk(KERN_INFO "Atari floppy driver: max. %cD, %strack buffering\n", 2135 DriveType == 0 ? 'D' : DriveType == 1 ? 'H' : 'E', 2136 UseTrackbuffer ? "" : "no "); 2137 config_types(); 2138 2139 ret = __register_blkdev(FLOPPY_MAJOR, "fd", ataflop_probe); 2140 if (ret) { 2141 printk(KERN_ERR "atari_floppy_init: cannot register block device\n"); 2142 atari_floppy_cleanup(); 2143 } 2144 return ret; 2145 2146err_out_dma: 2147 atari_stram_free(DMABuffer); 2148err: 2149 while (--i >= 0) 2150 atari_cleanup_floppy_disk(&unit[i]); 2151 2152 return ret; 2153} 2154 2155#ifndef MODULE 2156static int __init atari_floppy_setup(char *str) 2157{ 2158 int ints[3 + FD_MAX_UNITS]; 2159 int i; 2160 2161 if (!MACH_IS_ATARI) 2162 return 0; 2163 2164 str = get_options(str, 3 + FD_MAX_UNITS, ints); 2165 2166 if (ints[0] < 1) { 2167 printk(KERN_ERR "ataflop_setup: no arguments!\n" ); 2168 return 0; 2169 } 2170 else if (ints[0] > 2+FD_MAX_UNITS) { 2171 printk(KERN_ERR "ataflop_setup: too many arguments\n" ); 2172 } 2173 2174 if (ints[1] < 0 || ints[1] > 2) 2175 printk(KERN_ERR "ataflop_setup: bad drive type\n" ); 2176 else 2177 DriveType = ints[1]; 2178 2179 if (ints[0] >= 2) 2180 UseTrackbuffer = (ints[2] > 0); 2181 2182 for( i = 3; i <= ints[0] && i-3 < FD_MAX_UNITS; ++i ) { 2183 if (ints[i] != 2 && ints[i] != 3 && ints[i] != 6 && ints[i] != 12) 2184 printk(KERN_ERR "ataflop_setup: bad steprate\n" ); 2185 else 2186 UserSteprate[i-3] = ints[i]; 2187 } 2188 return 1; 2189} 2190 2191__setup("floppy=", atari_floppy_setup); 2192#endif 2193 2194static void __exit atari_floppy_exit(void) 2195{ 2196 unregister_blkdev(FLOPPY_MAJOR, "fd"); 2197 atari_floppy_cleanup(); 2198} 2199 2200module_init(atari_floppy_init) 2201module_exit(atari_floppy_exit) 2202 2203MODULE_DESCRIPTION("Atari floppy driver"); 2204MODULE_LICENSE("GPL");
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