drivers/block/ataflop.c

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

DEFINITIONS
