ataflop.c
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上传日期:2013-02-24
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- /*
- * drivers/block/ataflop.c
- *
- * Copyright (C) 1993 Greg Harp
- * Atari Support by Bjoern Brauel, Roman Hodek
- *
- * Big cleanup Sep 11..14 1994 Roman Hodek:
- * - Driver now works interrupt driven
- * - Support for two drives; should work, but I cannot test that :-(
- * - Reading is done in whole tracks and buffered to speed up things
- * - Disk change detection and drive deselecting after motor-off
- * similar to TOS
- * - Autodetection of disk format (DD/HD); untested yet, because I
- * don't have an HD drive :-(
- *
- * Fixes Nov 13 1994 Martin Schaller:
- * - Autodetection works now
- * - Support for 5 1/4'' disks
- * - Removed drive type (unknown on atari)
- * - Do seeks with 8 Mhz
- *
- * Changes by Andreas Schwab:
- * - After errors in multiple read mode try again reading single sectors
- * (Feb 1995):
- * - Clean up error handling
- * - Set blk_size for proper size checking
- * - Initialize track register when testing presence of floppy
- * - Implement some ioctl's
- *
- * Changes by Torsten Lang:
- * - When probing the floppies we should add the FDCCMDADD_H flag since
- * the FDC will otherwise wait forever when no disk is inserted...
- *
- * ++ Freddi Aschwanden (fa) 20.9.95 fixes for medusa:
- * - MFPDELAY() after each FDC access -> atari
- * - more/other disk formats
- * - DMA to the block buffer directly if we have a 32bit DMA
- * - for medusa, the step rate is always 3ms
- * - on medusa, use only cache_push()
- * Roman:
- * - Make disk format numbering independent from minors
- * - Let user set max. supported drive type (speeds up format
- * detection, saves buffer space)
- *
- * Roman 10/15/95:
- * - implement some more ioctls
- * - disk formatting
- *
- * Andreas 95/12/12:
- * - increase gap size at start of track for HD/ED disks
- *
- * Michael (MSch) 11/07/96:
- * - implemented FDSETPRM and FDDEFPRM ioctl
- *
- * Andreas (97/03/19):
- * - implemented missing BLK* ioctls
- *
- * Things left to do:
- * - Formatting
- * - Maybe a better strategy for disk change detection (does anyone
- * know one?)
- */
- #include <linux/module.h>
- #include <linux/sched.h>
- #include <linux/string.h>
- #include <linux/fs.h>
- #include <linux/fcntl.h>
- #include <linux/kernel.h>
- #include <linux/timer.h>
- #include <linux/fd.h>
- #include <linux/errno.h>
- #include <linux/types.h>
- #include <linux/delay.h>
- #include <linux/mm.h>
- #include <linux/slab.h>
- #include <linux/init.h>
- #include <asm/setup.h>
- #include <asm/system.h>
- #include <asm/bitops.h>
- #include <asm/irq.h>
- #include <asm/pgtable.h>
- #include <asm/uaccess.h>
- #include <asm/atafd.h>
- #include <asm/atafdreg.h>
- #include <asm/atarihw.h>
- #include <asm/atariints.h>
- #include <asm/atari_stdma.h>
- #include <asm/atari_stram.h>
- #define MAJOR_NR FLOPPY_MAJOR
- #include <linux/blk.h>
- #include <linux/blkpg.h>
- #define FD_MAX_UNITS 2
- #undef DEBUG
- /* Disk types: DD, HD, ED */
- static struct atari_disk_type {
- const char *name;
- unsigned spt; /* sectors per track */
- unsigned blocks; /* total number of blocks */
- unsigned fdc_speed; /* fdc_speed setting */
- unsigned stretch; /* track doubling ? */
- } disk_type[] = {
- { "d360", 9, 720, 0, 0}, /* 0: 360kB diskette */
- { "D360", 9, 720, 0, 1}, /* 1: 360kb in 720k or 1.2MB drive */
- { "D720", 9,1440, 0, 0}, /* 2: 720kb in 720k or 1.2MB drive */
- { "D820", 10,1640, 0, 0}, /* 3: DD disk with 82 tracks/10 sectors */
- /* formats above are probed for type DD */
- #define MAX_TYPE_DD 3
- { "h1200",15,2400, 3, 0}, /* 4: 1.2MB diskette */
- { "H1440",18,2880, 3, 0}, /* 5: 1.4 MB diskette (HD) */
- { "H1640",20,3280, 3, 0}, /* 6: 1.64MB diskette (fat HD) 82 tr 20 sec */
- /* formats above are probed for types DD and HD */
- #define MAX_TYPE_HD 6
- { "E2880",36,5760, 3, 0}, /* 7: 2.8 MB diskette (ED) */
- { "E3280",40,6560, 3, 0}, /* 8: 3.2 MB diskette (fat ED) 82 tr 40 sec */
- /* formats above are probed for types DD, HD and ED */
- #define MAX_TYPE_ED 8
- /* types below are never autoprobed */
- { "H1680",21,3360, 3, 0}, /* 9: 1.68MB diskette (fat HD) 80 tr 21 sec */
- { "h410",10,820, 0, 1}, /* 10: 410k diskette 41 tr 10 sec, stretch */
- { "h1476",18,2952, 3, 0}, /* 11: 1.48MB diskette 82 tr 18 sec */
- { "H1722",21,3444, 3, 0}, /* 12: 1.72MB diskette 82 tr 21 sec */
- { "h420",10,840, 0, 1}, /* 13: 420k diskette 42 tr 10 sec, stretch */
- { "H830",10,1660, 0, 0}, /* 14: 820k diskette 83 tr 10 sec */
- { "h1494",18,2952, 3, 0}, /* 15: 1.49MB diskette 83 tr 18 sec */
- { "H1743",21,3486, 3, 0}, /* 16: 1.74MB diskette 83 tr 21 sec */
- { "h880",11,1760, 0, 0}, /* 17: 880k diskette 80 tr 11 sec */
- { "D1040",13,2080, 0, 0}, /* 18: 1.04MB diskette 80 tr 13 sec */
- { "D1120",14,2240, 0, 0}, /* 19: 1.12MB diskette 80 tr 14 sec */
- { "h1600",20,3200, 3, 0}, /* 20: 1.60MB diskette 80 tr 20 sec */
- { "H1760",22,3520, 3, 0}, /* 21: 1.76MB diskette 80 tr 22 sec */
- { "H1920",24,3840, 3, 0}, /* 22: 1.92MB diskette 80 tr 24 sec */
- { "E3200",40,6400, 3, 0}, /* 23: 3.2MB diskette 80 tr 40 sec */
- { "E3520",44,7040, 3, 0}, /* 24: 3.52MB diskette 80 tr 44 sec */
- { "E3840",48,7680, 3, 0}, /* 25: 3.84MB diskette 80 tr 48 sec */
- { "H1840",23,3680, 3, 0}, /* 26: 1.84MB diskette 80 tr 23 sec */
- { "D800",10,1600, 0, 0}, /* 27: 800k diskette 80 tr 10 sec */
- };
- static int StartDiskType[] = {
- MAX_TYPE_DD,
- MAX_TYPE_HD,
- MAX_TYPE_ED
- };
- #define TYPE_DD 0
- #define TYPE_HD 1
- #define TYPE_ED 2
- static int DriveType = TYPE_HD;
- /* Array for translating minors into disk formats */
- static struct {
- int index;
- unsigned drive_types;
- } minor2disktype[] = {
- { 0, TYPE_DD }, /* 1: d360 */
- { 4, TYPE_HD }, /* 2: h1200 */
- { 1, TYPE_DD }, /* 3: D360 */
- { 2, TYPE_DD }, /* 4: D720 */
- { 1, TYPE_DD }, /* 5: h360 = D360 */
- { 2, TYPE_DD }, /* 6: h720 = D720 */
- { 5, TYPE_HD }, /* 7: H1440 */
- { 7, TYPE_ED }, /* 8: E2880 */
- /* some PC formats :-) */
- { 8, TYPE_ED }, /* 9: E3280 <- was "CompaQ" == E2880 for PC */
- { 5, TYPE_HD }, /* 10: h1440 = H1440 */
- { 9, TYPE_HD }, /* 11: H1680 */
- { 10, TYPE_DD }, /* 12: h410 */
- { 3, TYPE_DD }, /* 13: H820 <- == D820, 82x10 */
- { 11, TYPE_HD }, /* 14: h1476 */
- { 12, TYPE_HD }, /* 15: H1722 */
- { 13, TYPE_DD }, /* 16: h420 */
- { 14, TYPE_DD }, /* 17: H830 */
- { 15, TYPE_HD }, /* 18: h1494 */
- { 16, TYPE_HD }, /* 19: H1743 */
- { 17, TYPE_DD }, /* 20: h880 */
- { 18, TYPE_DD }, /* 21: D1040 */
- { 19, TYPE_DD }, /* 22: D1120 */
- { 20, TYPE_HD }, /* 23: h1600 */
- { 21, TYPE_HD }, /* 24: H1760 */
- { 22, TYPE_HD }, /* 25: H1920 */
- { 23, TYPE_ED }, /* 26: E3200 */
- { 24, TYPE_ED }, /* 27: E3520 */
- { 25, TYPE_ED }, /* 28: E3840 */
- { 26, TYPE_HD }, /* 29: H1840 */
- { 27, TYPE_DD }, /* 30: D800 */
- { 6, TYPE_HD }, /* 31: H1640 <- was H1600 == h1600 for PC */
- };
- #define NUM_DISK_MINORS (sizeof(minor2disktype)/sizeof(*minor2disktype))
- /*
- * Maximum disk size (in kilobytes). This default is used whenever the
- * current disk size is unknown.
- */
- #define MAX_DISK_SIZE 3280
- /*
- * MSch: User-provided type information. 'drive' points to
- * the respective entry of this array. Set by FDSETPRM ioctls.
- */
- static struct atari_disk_type user_params[FD_MAX_UNITS];
- /*
- * User-provided permanent type information. 'drive' points to
- * the respective entry of this array. Set by FDDEFPRM ioctls,
- * restored upon disk change by floppy_revalidate() if valid (as seen by
- * default_params[].blocks > 0 - a bit in unit[].flags might be used for this?)
- */
- static struct atari_disk_type default_params[FD_MAX_UNITS];
- static int floppy_sizes[256];
- static int floppy_blocksizes[256];
- /* current info on each unit */
- static struct atari_floppy_struct {
- int connected; /* !=0 : drive is connected */
- int autoprobe; /* !=0 : do autoprobe */
- struct atari_disk_type *disktype; /* current type of disk */
- int track; /* current head position or -1 if
- unknown */
- unsigned int steprate; /* steprate setting */
- unsigned int wpstat; /* current state of WP signal (for
- disk change detection) */
- int flags; /* flags */
- } unit[FD_MAX_UNITS];
- #define UD unit[drive]
- #define UDT unit[drive].disktype
- #define SUD unit[SelectedDrive]
- #define SUDT unit[SelectedDrive].disktype
- #define FDC_READ(reg) ({
- /* unsigned long __flags; */
- unsigned short __val;
- /* save_flags(__flags); cli(); */
- dma_wd.dma_mode_status = 0x80 | (reg);
- udelay(25);
- __val = dma_wd.fdc_acces_seccount;
- MFPDELAY();
- /* restore_flags(__flags); */
- __val & 0xff;
- })
- #define FDC_WRITE(reg,val)
- do {
- /* unsigned long __flags; */
- /* save_flags(__flags); cli(); */
- dma_wd.dma_mode_status = 0x80 | (reg);
- udelay(25);
- dma_wd.fdc_acces_seccount = (val);
- MFPDELAY();
- /* restore_flags(__flags); */
- } while(0)
- /* Buffering variables:
- * First, there is a DMA buffer in ST-RAM that is used for floppy DMA
- * operations. Second, a track buffer is used to cache a whole track
- * of the disk to save read operations. These are two separate buffers
- * because that allows write operations without clearing the track buffer.
- */
- static int MaxSectors[] = {
- 11, 22, 44
- };
- static int BufferSize[] = {
- 15*512, 30*512, 60*512
- };
- #define BUFFER_SIZE (BufferSize[DriveType])
- unsigned char *DMABuffer; /* buffer for writes */
- static unsigned long PhysDMABuffer; /* physical address */
- static int UseTrackbuffer = -1; /* Do track buffering? */
- MODULE_PARM(UseTrackbuffer, "i");
- unsigned char *TrackBuffer; /* buffer for reads */
- static unsigned long PhysTrackBuffer; /* physical address */
- static int BufferDrive, BufferSide, BufferTrack;
- static int read_track; /* non-zero if we are reading whole tracks */
- #define SECTOR_BUFFER(sec) (TrackBuffer + ((sec)-1)*512)
- #define IS_BUFFERED(drive,side,track)
- (BufferDrive == (drive) && BufferSide == (side) && BufferTrack == (track))
- /*
- * These are global variables, as that's the easiest way to give
- * information to interrupts. They are the data used for the current
- * request.
- */
- static int SelectedDrive = 0;
- static int ReqCmd, ReqBlock;
- static int ReqSide, ReqTrack, ReqSector, ReqCnt;
- static int HeadSettleFlag = 0;
- static unsigned char *ReqData, *ReqBuffer;
- static int MotorOn = 0, MotorOffTrys;
- static int IsFormatting = 0, FormatError;
- static int UserSteprate[FD_MAX_UNITS] = { -1, -1 };
- MODULE_PARM(UserSteprate, "1-" __MODULE_STRING(FD_MAX_UNITS) "i");
- /* Synchronization of FDC access. */
- static volatile int fdc_busy = 0;
- static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
- static DECLARE_WAIT_QUEUE_HEAD(format_wait);
- static unsigned long changed_floppies = 0xff, fake_change = 0;
- #define CHECK_CHANGE_DELAY HZ/2
- #define FD_MOTOR_OFF_DELAY (3*HZ)
- #define FD_MOTOR_OFF_MAXTRY (10*20)
- #define FLOPPY_TIMEOUT (6*HZ)
- #define RECALIBRATE_ERRORS 4 /* After this many errors the drive
- * will be recalibrated. */
- #define MAX_ERRORS 8 /* After this many errors the driver
- * will give up. */
- /*
- * The driver is trying to determine the correct media format
- * while Probing is set. fd_rwsec_done() clears it after a
- * successful access.
- */
- static int Probing = 0;
- /* This flag is set when a dummy seek is necessary to make the WP
- * status bit accessible.
- */
- static int NeedSeek = 0;
- #ifdef DEBUG
- #define DPRINT(a) printk a
- #else
- #define DPRINT(a)
- #endif
- /***************************** Prototypes *****************************/
- static void fd_select_side( int side );
- static void fd_select_drive( int drive );
- static void fd_deselect( void );
- static void fd_motor_off_timer( unsigned long dummy );
- static void check_change( void );
- static __inline__ void set_head_settle_flag( void );
- static __inline__ int get_head_settle_flag( void );
- static void floppy_irq (int irq, void *dummy, struct pt_regs *fp);
- static void fd_error( void );
- static int do_format(kdev_t drive, struct atari_format_descr *desc);
- static void do_fd_action( int drive );
- static void fd_calibrate( void );
- static void fd_calibrate_done( int status );
- static void fd_seek( void );
- static void fd_seek_done( int status );
- static void fd_rwsec( void );
- static void fd_readtrack_check( unsigned long dummy );
- static void fd_rwsec_done( int status );
- static void fd_rwsec_done1(int status);
- static void fd_writetrack( void );
- static void fd_writetrack_done( int status );
- static void fd_times_out( unsigned long dummy );
- static void finish_fdc( void );
- static void finish_fdc_done( int dummy );
- static void floppy_off( unsigned int nr);
- static __inline__ void copy_buffer( void *from, void *to);
- static void setup_req_params( int drive );
- static void redo_fd_request( void);
- static int invalidate_drive(kdev_t rdev);
- static int fd_ioctl( struct inode *inode, struct file *filp, unsigned int
- cmd, unsigned long param);
- static void fd_probe( int drive );
- static int fd_test_drive_present( int drive );
- static void config_types( void );
- static int floppy_open( struct inode *inode, struct file *filp );
- static int floppy_release( struct inode * inode, struct file * filp );
- /************************* End of Prototypes **************************/
- static struct timer_list motor_off_timer =
- { function: fd_motor_off_timer };
- static struct timer_list readtrack_timer =
- { function: fd_readtrack_check };
- static struct timer_list timeout_timer =
- { function: fd_times_out };
- static struct timer_list fd_timer =
- { function: check_change };
-
- static inline void
- start_motor_off_timer(void)
- {
- mod_timer(&motor_off_timer, jiffies + FD_MOTOR_OFF_DELAY);
- MotorOffTrys = 0;
- }
- static inline void
- start_check_change_timer( void )
- {
- mod_timer(&fd_timer, jiffies + CHECK_CHANGE_DELAY);
- }
- static inline void
- start_timeout(void)
- {
- mod_timer(&timeout_timer, jiffies + FLOPPY_TIMEOUT);
- }
- static inline void
- stop_timeout(void)
- {
- del_timer(&timeout_timer);
- }
- /* Select the side to use. */
- static void fd_select_side( int side )
- {
- unsigned long flags;
- save_flags(flags);
- cli(); /* protect against various other ints mucking around with the PSG */
-
- sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */
- sound_ym.wd_data = (side == 0) ? sound_ym.rd_data_reg_sel | 0x01 :
- sound_ym.rd_data_reg_sel & 0xfe;
- restore_flags(flags);
- }
- /* Select a drive, update the FDC's track register and set the correct
- * clock speed for this disk's type.
- */
- static void fd_select_drive( int drive )
- {
- unsigned long flags;
- unsigned char tmp;
-
- if (drive == SelectedDrive)
- return;
- save_flags(flags);
- cli(); /* protect against various other ints mucking around with the PSG */
- sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */
- tmp = sound_ym.rd_data_reg_sel;
- sound_ym.wd_data = (tmp | DSKDRVNONE) & ~(drive == 0 ? DSKDRV0 : DSKDRV1);
- atari_dont_touch_floppy_select = 1;
- restore_flags(flags);
- /* restore track register to saved value */
- FDC_WRITE( FDCREG_TRACK, UD.track );
- udelay(25);
- /* select 8/16 MHz */
- if (UDT)
- if (ATARIHW_PRESENT(FDCSPEED))
- dma_wd.fdc_speed = UDT->fdc_speed;
-
- SelectedDrive = drive;
- }
- /* Deselect both drives. */
- static void fd_deselect( void )
- {
- unsigned long flags;
- save_flags(flags);
- cli(); /* protect against various other ints mucking around with the PSG */
- atari_dont_touch_floppy_select = 0;
- sound_ym.rd_data_reg_sel=14; /* Select PSG Port A */
- sound_ym.wd_data = (sound_ym.rd_data_reg_sel |
- (MACH_IS_FALCON ? 3 : 7)); /* no drives selected */
- /* On Falcon, the drive B select line is used on the printer port, so
- * leave it alone... */
- SelectedDrive = -1;
- restore_flags(flags);
- }
- /* This timer function deselects the drives when the FDC switched the
- * motor off. The deselection cannot happen earlier because the FDC
- * counts the index signals, which arrive only if one drive is selected.
- */
- static void fd_motor_off_timer( unsigned long dummy )
- {
- unsigned char status;
- if (SelectedDrive < 0)
- /* no drive selected, needn't deselect anyone */
- return;
- if (stdma_islocked())
- goto retry;
- status = FDC_READ( FDCREG_STATUS );
- if (!(status & 0x80)) {
- /* motor already turned off by FDC -> deselect drives */
- MotorOn = 0;
- fd_deselect();
- return;
- }
- /* not yet off, try again */
- retry:
- /* Test again later; if tested too often, it seems there is no disk
- * in the drive and the FDC will leave the motor on forever (or,
- * at least until a disk is inserted). So we'll test only twice
- * per second from then on...
- */
- mod_timer(&motor_off_timer,
- jiffies + (MotorOffTrys++ < FD_MOTOR_OFF_MAXTRY ? HZ/20 : HZ/2));
- }
- /* This function is repeatedly called to detect disk changes (as good
- * as possible) and keep track of the current state of the write protection.
- */
- static void check_change( void )
- {
- static int drive = 0;
- unsigned long flags;
- unsigned char old_porta;
- int stat;
- if (++drive > 1 || !UD.connected)
- drive = 0;
- save_flags(flags);
- cli(); /* protect against various other ints mucking around with the PSG */
- if (!stdma_islocked()) {
- sound_ym.rd_data_reg_sel = 14;
- old_porta = sound_ym.rd_data_reg_sel;
- sound_ym.wd_data = (old_porta | DSKDRVNONE) &
- ~(drive == 0 ? DSKDRV0 : DSKDRV1);
- stat = !!(FDC_READ( FDCREG_STATUS ) & FDCSTAT_WPROT);
- sound_ym.wd_data = old_porta;
- if (stat != UD.wpstat) {
- DPRINT(( "wpstat[%d] = %dn", drive, stat ));
- UD.wpstat = stat;
- set_bit (drive, &changed_floppies);
- }
- }
- restore_flags(flags);
- start_check_change_timer();
- }
-
- /* Handling of the Head Settling Flag: This flag should be set after each
- * seek operation, because we don't use seeks with verify.
- */
- static __inline__ void set_head_settle_flag( void )
- {
- HeadSettleFlag = FDCCMDADD_E;
- }
- static __inline__ int get_head_settle_flag( void )
- {
- int tmp = HeadSettleFlag;
- HeadSettleFlag = 0;
- return( tmp );
- }
-
-
- /* General Interrupt Handling */
- static void (*FloppyIRQHandler)( int status ) = NULL;
- static void floppy_irq (int irq, void *dummy, struct pt_regs *fp)
- {
- unsigned char status;
- void (*handler)( int );
- handler = xchg(&FloppyIRQHandler, NULL);
- if (handler) {
- nop();
- status = FDC_READ( FDCREG_STATUS );
- DPRINT(("FDC irq, status = %02x handler = %08lxn",status,(unsigned long)handler));
- handler( status );
- }
- else {
- DPRINT(("FDC irq, no handlern"));
- }
- }
- /* Error handling: If some error happened, retry some times, then
- * recalibrate, then try again, and fail after MAX_ERRORS.
- */
- static void fd_error( void )
- {
- if (IsFormatting) {
- IsFormatting = 0;
- FormatError = 1;
- wake_up( &format_wait );
- return;
- }
-
- if (QUEUE_EMPTY) return;
- CURRENT->errors++;
- if (CURRENT->errors >= MAX_ERRORS) {
- printk(KERN_ERR "fd%d: too many errors.n", SelectedDrive );
- end_request( 0 );
- }
- else if (CURRENT->errors == RECALIBRATE_ERRORS) {
- printk(KERN_WARNING "fd%d: recalibratingn", SelectedDrive );
- if (SelectedDrive != -1)
- SUD.track = -1;
- }
- redo_fd_request();
- }
- #define SET_IRQ_HANDLER(proc) do { FloppyIRQHandler = (proc); } while(0)
- /* ---------- Formatting ---------- */
- #define FILL(n,val)
- do {
- memset( p, val, n );
- p += n;
- } while(0)
- static int do_format(kdev_t device, struct atari_format_descr *desc)
- {
- unsigned char *p;
- int sect, nsect;
- unsigned long flags;
- int type, drive = MINOR(device) & 3;
- DPRINT(("do_format( dr=%d tr=%d he=%d offs=%d )n",
- drive, desc->track, desc->head, desc->sect_offset ));
- save_flags(flags);
- cli();
- while( fdc_busy ) sleep_on( &fdc_wait );
- fdc_busy = 1;
- stdma_lock(floppy_irq, NULL);
- atari_turnon_irq( IRQ_MFP_FDC ); /* should be already, just to be sure */
- restore_flags(flags);
- type = MINOR(device) >> 2;
- if (type) {
- if (--type >= NUM_DISK_MINORS ||
- minor2disktype[type].drive_types > DriveType) {
- redo_fd_request();
- return -EINVAL;
- }
- type = minor2disktype[type].index;
- UDT = &disk_type[type];
- }
- if (!UDT || desc->track >= UDT->blocks/UDT->spt/2 || desc->head >= 2) {
- redo_fd_request();
- return -EINVAL;
- }
- nsect = UDT->spt;
- p = TrackBuffer;
- /* The track buffer is used for the raw track data, so its
- contents become invalid! */
- BufferDrive = -1;
- /* stop deselect timer */
- del_timer( &motor_off_timer );
- FILL( 60 * (nsect / 9), 0x4e );
- for( sect = 0; sect < nsect; ++sect ) {
- FILL( 12, 0 );
- FILL( 3, 0xf5 );
- *p++ = 0xfe;
- *p++ = desc->track;
- *p++ = desc->head;
- *p++ = (nsect + sect - desc->sect_offset) % nsect + 1;
- *p++ = 2;
- *p++ = 0xf7;
- FILL( 22, 0x4e );
- FILL( 12, 0 );
- FILL( 3, 0xf5 );
- *p++ = 0xfb;
- FILL( 512, 0xe5 );
- *p++ = 0xf7;
- FILL( 40, 0x4e );
- }
- FILL( TrackBuffer+BUFFER_SIZE-p, 0x4e );
- IsFormatting = 1;
- FormatError = 0;
- ReqTrack = desc->track;
- ReqSide = desc->head;
- do_fd_action( drive );
- sleep_on( &format_wait );
- redo_fd_request();
- return( FormatError ? -EIO : 0 );
- }
- /* do_fd_action() is the general procedure for a fd request: All
- * required parameter settings (drive select, side select, track
- * position) are checked and set if needed. For each of these
- * parameters and the actual reading or writing exist two functions:
- * one that starts the setting (or skips it if possible) and one
- * callback for the "done" interrupt. Each done func calls the next
- * set function to propagate the request down to fd_rwsec_done().
- */
- static void do_fd_action( int drive )
- {
- DPRINT(("do_fd_actionn"));
-
- if (UseTrackbuffer && !IsFormatting) {
- repeat:
- if (IS_BUFFERED( drive, ReqSide, ReqTrack )) {
- if (ReqCmd == READ) {
- copy_buffer( SECTOR_BUFFER(ReqSector), ReqData );
- if (++ReqCnt < CURRENT->current_nr_sectors) {
- /* read next sector */
- setup_req_params( drive );
- goto repeat;
- }
- else {
- /* all sectors finished */
- CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
- CURRENT->sector += CURRENT->current_nr_sectors;
- end_request( 1 );
- redo_fd_request();
- return;
- }
- }
- else {
- /* cmd == WRITE, pay attention to track buffer
- * consistency! */
- copy_buffer( ReqData, SECTOR_BUFFER(ReqSector) );
- }
- }
- }
- if (SelectedDrive != drive)
- fd_select_drive( drive );
-
- if (UD.track == -1)
- fd_calibrate();
- else if (UD.track != ReqTrack << UDT->stretch)
- fd_seek();
- else if (IsFormatting)
- fd_writetrack();
- else
- fd_rwsec();
- }
- /* Seek to track 0 if the current track is unknown */
- static void fd_calibrate( void )
- {
- if (SUD.track >= 0) {
- fd_calibrate_done( 0 );
- return;
- }
- if (ATARIHW_PRESENT(FDCSPEED))
- dma_wd.fdc_speed = 0; /* always seek with 8 Mhz */;
- DPRINT(("fd_calibraten"));
- SET_IRQ_HANDLER( fd_calibrate_done );
- /* we can't verify, since the speed may be incorrect */
- FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | SUD.steprate );
- NeedSeek = 1;
- MotorOn = 1;
- start_timeout();
- /* wait for IRQ */
- }
- static void fd_calibrate_done( int status )
- {
- DPRINT(("fd_calibrate_done()n"));
- stop_timeout();
-
- /* set the correct speed now */
- if (ATARIHW_PRESENT(FDCSPEED))
- dma_wd.fdc_speed = SUDT->fdc_speed;
- if (status & FDCSTAT_RECNF) {
- printk(KERN_ERR "fd%d: restore failedn", SelectedDrive );
- fd_error();
- }
- else {
- SUD.track = 0;
- fd_seek();
- }
- }
-
-
- /* Seek the drive to the requested track. The drive must have been
- * calibrated at some point before this.
- */
-
- static void fd_seek( void )
- {
- if (SUD.track == ReqTrack << SUDT->stretch) {
- fd_seek_done( 0 );
- return;
- }
- if (ATARIHW_PRESENT(FDCSPEED)) {
- dma_wd.fdc_speed = 0; /* always seek witch 8 Mhz */
- MFPDELAY();
- }
- DPRINT(("fd_seek() to track %dn",ReqTrack));
- FDC_WRITE( FDCREG_DATA, ReqTrack << SUDT->stretch);
- udelay(25);
- SET_IRQ_HANDLER( fd_seek_done );
- FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK | SUD.steprate );
- MotorOn = 1;
- set_head_settle_flag();
- start_timeout();
- /* wait for IRQ */
- }
- static void fd_seek_done( int status )
- {
- DPRINT(("fd_seek_done()n"));
- stop_timeout();
-
- /* set the correct speed */
- if (ATARIHW_PRESENT(FDCSPEED))
- dma_wd.fdc_speed = SUDT->fdc_speed;
- if (status & FDCSTAT_RECNF) {
- printk(KERN_ERR "fd%d: seek error (to track %d)n",
- SelectedDrive, ReqTrack );
- /* we don't know exactly which track we are on now! */
- SUD.track = -1;
- fd_error();
- }
- else {
- SUD.track = ReqTrack << SUDT->stretch;
- NeedSeek = 0;
- if (IsFormatting)
- fd_writetrack();
- else
- fd_rwsec();
- }
- }
- /* This does the actual reading/writing after positioning the head
- * over the correct track.
- */
- static int MultReadInProgress = 0;
- static void fd_rwsec( void )
- {
- unsigned long paddr, flags;
- unsigned int rwflag, old_motoron;
- unsigned int track;
-
- DPRINT(("fd_rwsec(), Sec=%d, Access=%cn",ReqSector, ReqCmd == WRITE ? 'w' : 'r' ));
- if (ReqCmd == WRITE) {
- if (ATARIHW_PRESENT(EXTD_DMA)) {
- paddr = virt_to_phys(ReqData);
- }
- else {
- copy_buffer( ReqData, DMABuffer );
- paddr = PhysDMABuffer;
- }
- dma_cache_maintenance( paddr, 512, 1 );
- rwflag = 0x100;
- }
- else {
- if (read_track)
- paddr = PhysTrackBuffer;
- else
- paddr = ATARIHW_PRESENT(EXTD_DMA) ?
- virt_to_phys(ReqData) : PhysDMABuffer;
- rwflag = 0;
- }
- fd_select_side( ReqSide );
-
- /* Start sector of this operation */
- FDC_WRITE( FDCREG_SECTOR, read_track ? 1 : ReqSector );
- MFPDELAY();
- /* Cheat for track if stretch != 0 */
- if (SUDT->stretch) {
- track = FDC_READ( FDCREG_TRACK);
- MFPDELAY();
- FDC_WRITE( FDCREG_TRACK, track >> SUDT->stretch);
- }
- udelay(25);
-
- /* Setup DMA */
- save_flags(flags);
- cli();
- dma_wd.dma_lo = (unsigned char)paddr;
- MFPDELAY();
- paddr >>= 8;
- dma_wd.dma_md = (unsigned char)paddr;
- MFPDELAY();
- paddr >>= 8;
- if (ATARIHW_PRESENT(EXTD_DMA))
- st_dma_ext_dmahi = (unsigned short)paddr;
- else
- dma_wd.dma_hi = (unsigned char)paddr;
- MFPDELAY();
- restore_flags(flags);
-
- /* Clear FIFO and switch DMA to correct mode */
- dma_wd.dma_mode_status = 0x90 | rwflag;
- MFPDELAY();
- dma_wd.dma_mode_status = 0x90 | (rwflag ^ 0x100);
- MFPDELAY();
- dma_wd.dma_mode_status = 0x90 | rwflag;
- MFPDELAY();
-
- /* How many sectors for DMA */
- dma_wd.fdc_acces_seccount = read_track ? SUDT->spt : 1;
-
- udelay(25);
-
- /* Start operation */
- dma_wd.dma_mode_status = FDCSELREG_STP | rwflag;
- udelay(25);
- SET_IRQ_HANDLER( fd_rwsec_done );
- dma_wd.fdc_acces_seccount =
- (get_head_settle_flag() |
- (rwflag ? FDCCMD_WRSEC : (FDCCMD_RDSEC | (read_track ? FDCCMDADD_M : 0))));
- old_motoron = MotorOn;
- MotorOn = 1;
- NeedSeek = 1;
- /* wait for interrupt */
- if (read_track) {
- /* If reading a whole track, wait about one disk rotation and
- * then check if all sectors are read. The FDC will even
- * search for the first non-existent sector and need 1 sec to
- * recognise that it isn't present :-(
- */
- MultReadInProgress = 1;
- mod_timer(&readtrack_timer,
- /* 1 rot. + 5 rot.s if motor was off */
- jiffies + HZ/5 + (old_motoron ? 0 : HZ));
- }
- start_timeout();
- }
-
- static void fd_readtrack_check( unsigned long dummy )
- {
- unsigned long flags, addr, addr2;
- save_flags(flags);
- cli();
- if (!MultReadInProgress) {
- /* This prevents a race condition that could arise if the
- * interrupt is triggered while the calling of this timer
- * callback function takes place. The IRQ function then has
- * already cleared 'MultReadInProgress' when flow of control
- * gets here.
- */
- restore_flags(flags);
- return;
- }
- /* get the current DMA address */
- /* ++ f.a. read twice to avoid being fooled by switcher */
- addr = 0;
- do {
- addr2 = addr;
- addr = dma_wd.dma_lo & 0xff;
- MFPDELAY();
- addr |= (dma_wd.dma_md & 0xff) << 8;
- MFPDELAY();
- if (ATARIHW_PRESENT( EXTD_DMA ))
- addr |= (st_dma_ext_dmahi & 0xffff) << 16;
- else
- addr |= (dma_wd.dma_hi & 0xff) << 16;
- MFPDELAY();
- } while(addr != addr2);
-
- if (addr >= PhysTrackBuffer + SUDT->spt*512) {
- /* already read enough data, force an FDC interrupt to stop
- * the read operation
- */
- SET_IRQ_HANDLER( NULL );
- MultReadInProgress = 0;
- restore_flags(flags);
- DPRINT(("fd_readtrack_check(): donen"));
- FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
- udelay(25);
- /* No error until now -- the FDC would have interrupted
- * otherwise!
- */
- fd_rwsec_done1(0);
- }
- else {
- /* not yet finished, wait another tenth rotation */
- restore_flags(flags);
- DPRINT(("fd_readtrack_check(): not yet finishedn"));
- mod_timer(&readtrack_timer, jiffies + HZ/5/10);
- }
- }
- static void fd_rwsec_done( int status )
- {
- DPRINT(("fd_rwsec_done()n"));
- if (read_track) {
- del_timer(&readtrack_timer);
- if (!MultReadInProgress)
- return;
- MultReadInProgress = 0;
- }
- fd_rwsec_done1(status);
- }
- static void fd_rwsec_done1(int status)
- {
- unsigned int track;
- stop_timeout();
-
- /* Correct the track if stretch != 0 */
- if (SUDT->stretch) {
- track = FDC_READ( FDCREG_TRACK);
- MFPDELAY();
- FDC_WRITE( FDCREG_TRACK, track << SUDT->stretch);
- }
- if (!UseTrackbuffer) {
- dma_wd.dma_mode_status = 0x90;
- MFPDELAY();
- if (!(dma_wd.dma_mode_status & 0x01)) {
- printk(KERN_ERR "fd%d: DMA errorn", SelectedDrive );
- goto err_end;
- }
- }
- MFPDELAY();
- if (ReqCmd == WRITE && (status & FDCSTAT_WPROT)) {
- printk(KERN_NOTICE "fd%d: is write protectedn", SelectedDrive );
- goto err_end;
- }
- if ((status & FDCSTAT_RECNF) &&
- /* RECNF is no error after a multiple read when the FDC
- searched for a non-existent sector! */
- !(read_track && FDC_READ(FDCREG_SECTOR) > SUDT->spt)) {
- if (Probing) {
- if (SUDT > disk_type) {
- if (SUDT[-1].blocks > ReqBlock) {
- /* try another disk type */
- SUDT--;
- floppy_sizes[SelectedDrive] = SUDT->blocks >> 1;
- } else
- Probing = 0;
- }
- else {
- if (SUD.flags & FTD_MSG)
- printk(KERN_INFO "fd%d: Auto-detected floppy type %sn",
- SelectedDrive, SUDT->name );
- Probing=0;
- }
- } else {
- /* record not found, but not probing. Maybe stretch wrong ? Restart probing */
- if (SUD.autoprobe) {
- SUDT = disk_type + StartDiskType[DriveType];
- floppy_sizes[SelectedDrive] = SUDT->blocks >> 1;
- Probing = 1;
- }
- }
- if (Probing) {
- if (ATARIHW_PRESENT(FDCSPEED)) {
- dma_wd.fdc_speed = SUDT->fdc_speed;
- MFPDELAY();
- }
- setup_req_params( SelectedDrive );
- BufferDrive = -1;
- do_fd_action( SelectedDrive );
- return;
- }
- printk(KERN_ERR "fd%d: sector %d not found (side %d, track %d)n",
- SelectedDrive, FDC_READ (FDCREG_SECTOR), ReqSide, ReqTrack );
- goto err_end;
- }
- if (status & FDCSTAT_CRC) {
- printk(KERN_ERR "fd%d: CRC error (side %d, track %d, sector %d)n",
- SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) );
- goto err_end;
- }
- if (status & FDCSTAT_LOST) {
- printk(KERN_ERR "fd%d: lost data (side %d, track %d, sector %d)n",
- SelectedDrive, ReqSide, ReqTrack, FDC_READ (FDCREG_SECTOR) );
- goto err_end;
- }
- Probing = 0;
-
- if (ReqCmd == READ) {
- if (!read_track) {
- void *addr;
- addr = ATARIHW_PRESENT( EXTD_DMA ) ? ReqData : DMABuffer;
- dma_cache_maintenance( virt_to_phys(addr), 512, 0 );
- if (!ATARIHW_PRESENT( EXTD_DMA ))
- copy_buffer (addr, ReqData);
- } else {
- dma_cache_maintenance( PhysTrackBuffer, MaxSectors[DriveType] * 512, 0 );
- BufferDrive = SelectedDrive;
- BufferSide = ReqSide;
- BufferTrack = ReqTrack;
- copy_buffer (SECTOR_BUFFER (ReqSector), ReqData);
- }
- }
-
- if (++ReqCnt < CURRENT->current_nr_sectors) {
- /* read next sector */
- setup_req_params( SelectedDrive );
- do_fd_action( SelectedDrive );
- }
- else {
- /* all sectors finished */
- CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
- CURRENT->sector += CURRENT->current_nr_sectors;
- end_request( 1 );
- redo_fd_request();
- }
- return;
-
- err_end:
- BufferDrive = -1;
- fd_error();
- }
- static void fd_writetrack( void )
- {
- unsigned long paddr, flags;
- unsigned int track;
-
- DPRINT(("fd_writetrack() Tr=%d Si=%dn", ReqTrack, ReqSide ));
- paddr = PhysTrackBuffer;
- dma_cache_maintenance( paddr, BUFFER_SIZE, 1 );
- fd_select_side( ReqSide );
-
- /* Cheat for track if stretch != 0 */
- if (SUDT->stretch) {
- track = FDC_READ( FDCREG_TRACK);
- MFPDELAY();
- FDC_WRITE(FDCREG_TRACK,track >> SUDT->stretch);
- }
- udelay(40);
-
- /* Setup DMA */
- save_flags(flags);
- cli();
- dma_wd.dma_lo = (unsigned char)paddr;
- MFPDELAY();
- paddr >>= 8;
- dma_wd.dma_md = (unsigned char)paddr;
- MFPDELAY();
- paddr >>= 8;
- if (ATARIHW_PRESENT( EXTD_DMA ))
- st_dma_ext_dmahi = (unsigned short)paddr;
- else
- dma_wd.dma_hi = (unsigned char)paddr;
- MFPDELAY();
- restore_flags(flags);
-
- /* Clear FIFO and switch DMA to correct mode */
- dma_wd.dma_mode_status = 0x190;
- MFPDELAY();
- dma_wd.dma_mode_status = 0x90;
- MFPDELAY();
- dma_wd.dma_mode_status = 0x190;
- MFPDELAY();
-
- /* How many sectors for DMA */
- dma_wd.fdc_acces_seccount = BUFFER_SIZE/512;
- udelay(40);
-
- /* Start operation */
- dma_wd.dma_mode_status = FDCSELREG_STP | 0x100;
- udelay(40);
- SET_IRQ_HANDLER( fd_writetrack_done );
- dma_wd.fdc_acces_seccount = FDCCMD_WRTRA | get_head_settle_flag();
- MotorOn = 1;
- start_timeout();
- /* wait for interrupt */
- }
- static void fd_writetrack_done( int status )
- {
- DPRINT(("fd_writetrack_done()n"));
- stop_timeout();
- if (status & FDCSTAT_WPROT) {
- printk(KERN_NOTICE "fd%d: is write protectedn", SelectedDrive );
- goto err_end;
- }
- if (status & FDCSTAT_LOST) {
- printk(KERN_ERR "fd%d: lost data (side %d, track %d)n",
- SelectedDrive, ReqSide, ReqTrack );
- goto err_end;
- }
- wake_up( &format_wait );
- return;
- err_end:
- fd_error();
- }
- static void fd_times_out( unsigned long dummy )
- {
- atari_disable_irq( IRQ_MFP_FDC );
- if (!FloppyIRQHandler) goto end; /* int occurred after timer was fired, but
- * before we came here... */
- SET_IRQ_HANDLER( NULL );
- /* If the timeout occurred while the readtrack_check timer was
- * active, we need to cancel it, else bad things will happen */
- if (UseTrackbuffer)
- del_timer( &readtrack_timer );
- FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
- udelay( 25 );
-
- printk(KERN_ERR "floppy timeoutn" );
- fd_error();
- end:
- atari_enable_irq( IRQ_MFP_FDC );
- }
- /* The (noop) seek operation here is needed to make the WP bit in the
- * FDC status register accessible for check_change. If the last disk
- * operation would have been a RDSEC, this bit would always read as 0
- * no matter what :-( To save time, the seek goes to the track we're
- * already on.
- */
- static void finish_fdc( void )
- {
- if (!NeedSeek) {
- finish_fdc_done( 0 );
- }
- else {
- DPRINT(("finish_fdc: dummy seek startedn"));
- FDC_WRITE (FDCREG_DATA, SUD.track);
- SET_IRQ_HANDLER( finish_fdc_done );
- FDC_WRITE (FDCREG_CMD, FDCCMD_SEEK);
- MotorOn = 1;
- start_timeout();
- /* we must wait for the IRQ here, because the ST-DMA
- is released immediately afterwards and the interrupt
- may be delivered to the wrong driver. */
- }
- }
- static void finish_fdc_done( int dummy )
- {
- unsigned long flags;
- DPRINT(("finish_fdc_done enteredn"));
- stop_timeout();
- NeedSeek = 0;
- if (timer_pending(&fd_timer) && time_before(fd_timer.expires, jiffies + 5))
- /* If the check for a disk change is done too early after this
- * last seek command, the WP bit still reads wrong :-((
- */
- mod_timer(&fd_timer, jiffies + 5);
- else
- start_check_change_timer();
- start_motor_off_timer();
- save_flags(flags);
- cli();
- stdma_release();
- fdc_busy = 0;
- wake_up( &fdc_wait );
- restore_flags(flags);
- DPRINT(("finish_fdc() finishedn"));
- }
- /* Prevent "aliased" accesses. */
- static int fd_ref[4] = { 0,0,0,0 };
- static int fd_device[4] = { 0,0,0,0 };
- /*
- * Current device number. Taken either from the block header or from the
- * format request descriptor.
- */
- #define CURRENT_DEVICE (CURRENT->rq_dev)
- /* Current error count. */
- #define CURRENT_ERRORS (CURRENT->errors)
- /* dummy for blk.h */
- static void floppy_off( unsigned int nr) {}
- /* The detection of disk changes is a dark chapter in Atari history :-(
- * Because the "Drive ready" signal isn't present in the Atari
- * hardware, one has to rely on the "Write Protect". This works fine,
- * as long as no write protected disks are used. TOS solves this
- * problem by introducing tri-state logic ("maybe changed") and
- * looking at the serial number in block 0. This isn't possible for
- * Linux, since the floppy driver can't make assumptions about the
- * filesystem used on the disk and thus the contents of block 0. I've
- * chosen the method to always say "The disk was changed" if it is
- * unsure whether it was. This implies that every open or mount
- * invalidates the disk buffers if you work with write protected
- * disks. But at least this is better than working with incorrect data
- * due to unrecognised disk changes.
- */
- static int check_floppy_change (kdev_t dev)
- {
- unsigned int drive = MINOR(dev) & 0x03;
- if (MAJOR(dev) != MAJOR_NR) {
- printk(KERN_ERR "floppy_changed: not a floppyn");
- return 0;
- }
-
- if (test_bit (drive, &fake_change)) {
- /* simulated change (e.g. after formatting) */
- return 1;
- }
- if (test_bit (drive, &changed_floppies)) {
- /* surely changed (the WP signal changed at least once) */
- return 1;
- }
- if (UD.wpstat) {
- /* WP is on -> could be changed: to be sure, buffers should be
- * invalidated...
- */
- return 1;
- }
- return 0;
- }
- static int floppy_revalidate (kdev_t dev)
- {
- int drive = MINOR(dev) & 3;
- if (test_bit(drive, &changed_floppies) ||
- test_bit(drive, &fake_change) ||
- unit[drive].disktype == 0) {
- if (UD.flags & FTD_MSG)
- printk(KERN_ERR "floppy: clear format %p!n", UDT);
- BufferDrive = -1;
- clear_bit(drive, &fake_change);
- clear_bit(drive, &changed_floppies);
- /* MSch: clearing geometry makes sense only for autoprobe
- formats, for 'permanent user-defined' parameter:
- restore default_params[] here if flagged valid! */
- if (default_params[drive].blocks == 0)
- UDT = 0;
- else
- UDT = &default_params[drive];
- }
- return 0;
- }
- static __inline__ void copy_buffer(void *from, void *to)
- {
- ulong *p1 = (ulong *)from, *p2 = (ulong *)to;
- int cnt;
- for( cnt = 512/4; cnt; cnt-- )
- *p2++ = *p1++;
- }
- /* This sets up the global variables describing the current request. */
- static void setup_req_params( int drive )
- {
- int block = ReqBlock + ReqCnt;
- ReqTrack = block / UDT->spt;
- ReqSector = block - ReqTrack * UDT->spt + 1;
- ReqSide = ReqTrack & 1;
- ReqTrack >>= 1;
- ReqData = ReqBuffer + 512 * ReqCnt;
- if (UseTrackbuffer)
- read_track = (ReqCmd == READ && CURRENT_ERRORS == 0);
- else
- read_track = 0;
- DPRINT(("Request params: Si=%d Tr=%d Se=%d Data=%08lxn",ReqSide,
- ReqTrack, ReqSector, (unsigned long)ReqData ));
- }
- static void redo_fd_request(void)
- {
- int device, drive, type;
-
- DPRINT(("redo_fd_request: CURRENT=%08lx CURRENT->dev=%04x CURRENT->sector=%ldn",
- (unsigned long)CURRENT, !QUEUE_EMPTY ? CURRENT->rq_dev : 0,
- !QUEUE_EMPTY ? CURRENT->sector : 0 ));
- IsFormatting = 0;
- if (!QUEUE_EMPTY && CURRENT->rq_status == RQ_INACTIVE){
- return;
- }
- repeat:
-
- if (QUEUE_EMPTY)
- goto the_end;
- if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
- panic(DEVICE_NAME ": request list destroyed");
- if (CURRENT->bh && !buffer_locked(CURRENT->bh))
- panic(DEVICE_NAME ": block not locked");
- device = MINOR(CURRENT_DEVICE);
- drive = device & 3;
- type = device >> 2;
-
- if (!UD.connected) {
- /* drive not connected */
- printk(KERN_ERR "Unknown Device: fd%dn", drive );
- end_request(0);
- goto repeat;
- }
-
- if (type == 0) {
- if (!UDT) {
- Probing = 1;
- UDT = disk_type + StartDiskType[DriveType];
- floppy_sizes[drive] = UDT->blocks >> 1;
- UD.autoprobe = 1;
- }
- }
- else {
- /* user supplied disk type */
- if (--type >= NUM_DISK_MINORS) {
- printk(KERN_WARNING "fd%d: invalid disk format", drive );
- end_request( 0 );
- goto repeat;
- }
- if (minor2disktype[type].drive_types > DriveType) {
- printk(KERN_WARNING "fd%d: unsupported disk format", drive );
- end_request( 0 );
- goto repeat;
- }
- type = minor2disktype[type].index;
- UDT = &disk_type[type];
- floppy_sizes[drive] = UDT->blocks >> 1;
- UD.autoprobe = 0;
- }
-
- if (CURRENT->sector + 1 > UDT->blocks) {
- end_request(0);
- goto repeat;
- }
- /* stop deselect timer */
- del_timer( &motor_off_timer );
-
- ReqCnt = 0;
- ReqCmd = CURRENT->cmd;
- ReqBlock = CURRENT->sector;
- ReqBuffer = CURRENT->buffer;
- setup_req_params( drive );
- do_fd_action( drive );
- return;
- the_end:
- finish_fdc();
- }
- void do_fd_request(request_queue_t * q)
- {
- unsigned long flags;
- DPRINT(("do_fd_request for pid %dn",current->pid));
- while( fdc_busy ) sleep_on( &fdc_wait );
- fdc_busy = 1;
- stdma_lock(floppy_irq, NULL);
- atari_disable_irq( IRQ_MFP_FDC );
- save_flags(flags); /* The request function is called with ints
- sti(); * disabled... so must save the IPL for later */
- redo_fd_request();
- restore_flags(flags);
- atari_enable_irq( IRQ_MFP_FDC );
- }
- static int invalidate_drive(kdev_t rdev)
- {
- /* invalidate the buffer track to force a reread */
- BufferDrive = -1;
- set_bit(MINOR(rdev) & 3, &fake_change);
- check_disk_change(rdev);
- return 0;
- }
- static int fd_ioctl(struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long param)
- {
- int drive, type;
- kdev_t device;
- struct atari_format_descr fmt_desc;
- struct atari_disk_type *dtp;
- struct floppy_struct getprm;
- int settype;
- struct floppy_struct setprm;
- device = inode->i_rdev;
- switch (cmd) {
- case BLKROSET:
- case BLKROGET:
- case BLKRASET:
- case BLKRAGET:
- case BLKFLSBUF:
- return blk_ioctl(device, cmd, param);
- }
- drive = MINOR (device);
- type = drive >> 2;
- drive &= 3;
- switch (cmd) {
- case FDGETPRM:
- case BLKGETSIZE:
- if (type) {
- if (--type >= NUM_DISK_MINORS)
- return -ENODEV;
- if (minor2disktype[type].drive_types > DriveType)
- return -ENODEV;
- type = minor2disktype[type].index;
- dtp = &disk_type[type];
- if (UD.flags & FTD_MSG)
- printk (KERN_ERR "floppy%d: found dtp %p name %s!n",
- drive, dtp, dtp->name);
- }
- else {
- if (!UDT)
- return -ENXIO;
- else
- dtp = UDT;
- }
- if (cmd == BLKGETSIZE)
- return put_user(dtp->blocks, (unsigned long *)param);
- memset((void *)&getprm, 0, sizeof(getprm));
- getprm.size = dtp->blocks;
- getprm.sect = dtp->spt;
- getprm.head = 2;
- getprm.track = dtp->blocks/dtp->spt/2;
- getprm.stretch = dtp->stretch;
- if (copy_to_user((void *)param, &getprm, sizeof(getprm)))
- return -EFAULT;
- return 0;
- }
- switch (cmd) {
- case FDSETPRM:
- case FDDEFPRM:
- /*
- * MSch 7/96: simple 'set geometry' case: just set the
- * 'default' device params (minor == 0).
- * Currently, the drive geometry is cleared after each
- * disk change and subsequent revalidate()! simple
- * implementation of FDDEFPRM: save geometry from a
- * FDDEFPRM call and restore it in floppy_revalidate() !
- */
- /* get the parameters from user space */
- if (fd_ref[drive] != 1 && fd_ref[drive] != -1)
- return -EBUSY;
- if (copy_from_user(&setprm, (void *) param, sizeof(setprm)))
- return -EFAULT;
- /*
- * first of all: check for floppy change and revalidate,
- * or the next access will revalidate - and clear UDT :-(
- */
- if (check_floppy_change(device))
- floppy_revalidate(device);
- if (UD.flags & FTD_MSG)
- printk (KERN_INFO "floppy%d: setting size %d spt %d str %d!n",
- drive, setprm.size, setprm.sect, setprm.stretch);
- /* what if type > 0 here? Overwrite specified entry ? */
- if (type) {
- /* refuse to re-set a predefined type for now */
- redo_fd_request();
- return -EINVAL;
- }
- /*
- * type == 0: first look for a matching entry in the type list,
- * and set the UD.disktype field to use the perdefined entry.
- * TODO: add user-defined format to head of autoprobe list ?
- * Useful to include the user-type for future autodetection!
- */
- for (settype = 0; settype < NUM_DISK_MINORS; settype++) {
- int setidx = 0;
- if (minor2disktype[settype].drive_types > DriveType) {
- /* skip this one, invalid for drive ... */
- continue;
- }
- setidx = minor2disktype[settype].index;
- dtp = &disk_type[setidx];
- /* found matching entry ?? */
- if ( dtp->blocks == setprm.size
- && dtp->spt == setprm.sect
- && dtp->stretch == setprm.stretch ) {
- if (UD.flags & FTD_MSG)
- printk (KERN_INFO "floppy%d: setting %s %p!n",
- drive, dtp->name, dtp);
- UDT = dtp;
- floppy_sizes[drive] = UDT->blocks >> 1;
- if (cmd == FDDEFPRM) {
- /* save settings as permanent default type */
- default_params[drive].name = dtp->name;
- default_params[drive].spt = dtp->spt;
- default_params[drive].blocks = dtp->blocks;
- default_params[drive].fdc_speed = dtp->fdc_speed;
- default_params[drive].stretch = dtp->stretch;
- }
-
- return 0;
- }
- }
- /* no matching disk type found above - setting user_params */
- if (cmd == FDDEFPRM) {
- /* set permanent type */
- dtp = &default_params[drive];
- } else
- /* set user type (reset by disk change!) */
- dtp = &user_params[drive];
- dtp->name = "user format";
- dtp->blocks = setprm.size;
- dtp->spt = setprm.sect;
- if (setprm.sect > 14)
- dtp->fdc_speed = 3;
- else
- dtp->fdc_speed = 0;
- dtp->stretch = setprm.stretch;
- if (UD.flags & FTD_MSG)
- printk (KERN_INFO "floppy%d: blk %d spt %d str %d!n",
- drive, dtp->blocks, dtp->spt, dtp->stretch);
- /* sanity check */
- if (!dtp || setprm.track != dtp->blocks/dtp->spt/2 ||
- setprm.head != 2) {
- redo_fd_request();
- return -EINVAL;
- }
- UDT = dtp;
- floppy_sizes[drive] = UDT->blocks >> 1;
- return 0;
- case FDMSGON:
- UD.flags |= FTD_MSG;
- return 0;
- case FDMSGOFF:
- UD.flags &= ~FTD_MSG;
- return 0;
- case FDSETEMSGTRESH:
- return -EINVAL;
- case FDFMTBEG:
- return 0;
- case FDFMTTRK:
- if (fd_ref[drive] != 1 && fd_ref[drive] != -1)
- return -EBUSY;
- if (copy_from_user(&fmt_desc, (void *) param, sizeof(fmt_desc)))
- return -EFAULT;
- return do_format(device, &fmt_desc);
- case FDCLRPRM:
- UDT = NULL;
- /* MSch: invalidate default_params */
- default_params[drive].blocks = 0;
- floppy_sizes[drive] = MAX_DISK_SIZE;
- return invalidate_drive (device);
- case FDFMTEND:
- case FDFLUSH:
- return invalidate_drive(device);
- }
- return -EINVAL;
- }
- /* Initialize the 'unit' variable for drive 'drive' */
- static void __init fd_probe( int drive )
- {
- UD.connected = 0;
- UDT = NULL;
- if (!fd_test_drive_present( drive ))
- return;
- UD.connected = 1;
- UD.track = 0;
- switch( UserSteprate[drive] ) {
- case 2:
- UD.steprate = FDCSTEP_2;
- break;
- case 3:
- UD.steprate = FDCSTEP_3;
- break;
- case 6:
- UD.steprate = FDCSTEP_6;
- break;
- case 12:
- UD.steprate = FDCSTEP_12;
- break;
- default: /* should be -1 for "not set by user" */
- if (ATARIHW_PRESENT( FDCSPEED ) || MACH_IS_MEDUSA)
- UD.steprate = FDCSTEP_3;
- else
- UD.steprate = FDCSTEP_6;
- break;
- }
- MotorOn = 1; /* from probe restore operation! */
- }
- /* This function tests the physical presence of a floppy drive (not
- * whether a disk is inserted). This is done by issuing a restore
- * command, waiting max. 2 seconds (that should be enough to move the
- * head across the whole disk) and looking at the state of the "TR00"
- * signal. This should now be raised if there is a drive connected
- * (and there is no hardware failure :-) Otherwise, the drive is
- * declared absent.
- */
- static int __init fd_test_drive_present( int drive )
- {
- unsigned long timeout;
- unsigned char status;
- int ok;
-
- if (drive >= (MACH_IS_FALCON ? 1 : 2)) return( 0 );
- fd_select_drive( drive );
- /* disable interrupt temporarily */
- atari_turnoff_irq( IRQ_MFP_FDC );
- FDC_WRITE (FDCREG_TRACK, 0xff00);
- FDC_WRITE( FDCREG_CMD, FDCCMD_RESTORE | FDCCMDADD_H | FDCSTEP_6 );
- timeout = jiffies + 2*HZ+HZ/2;
- while (time_before(jiffies, timeout))
- if (!(mfp.par_dt_reg & 0x20))
- break;
- status = FDC_READ( FDCREG_STATUS );
- ok = (status & FDCSTAT_TR00) != 0;
- /* force interrupt to abort restore operation (FDC would try
- * about 50 seconds!) */
- FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
- udelay(500);
- status = FDC_READ( FDCREG_STATUS );
- udelay(20);
- if (ok) {
- /* dummy seek command to make WP bit accessible */
- FDC_WRITE( FDCREG_DATA, 0 );
- FDC_WRITE( FDCREG_CMD, FDCCMD_SEEK );
- while( mfp.par_dt_reg & 0x20 )
- ;
- status = FDC_READ( FDCREG_STATUS );
- }
- atari_turnon_irq( IRQ_MFP_FDC );
- return( ok );
- }
- /* Look how many and which kind of drives are connected. If there are
- * floppies, additionally start the disk-change and motor-off timers.
- */
- static void __init config_types( void )
- {
- int drive, cnt = 0;
- /* for probing drives, set the FDC speed to 8 MHz */
- if (ATARIHW_PRESENT(FDCSPEED))
- dma_wd.fdc_speed = 0;
- printk(KERN_INFO "Probing floppy drive(s):n");
- for( drive = 0; drive < FD_MAX_UNITS; drive++ ) {
- fd_probe( drive );
- if (UD.connected) {
- printk(KERN_INFO "fd%dn", drive);
- ++cnt;
- }
- }
- if (FDC_READ( FDCREG_STATUS ) & FDCSTAT_BUSY) {
- /* If FDC is still busy from probing, give it another FORCI
- * command to abort the operation. If this isn't done, the FDC
- * will interrupt later and its IRQ line stays low, because
- * the status register isn't read. And this will block any
- * interrupts on this IRQ line :-(
- */
- FDC_WRITE( FDCREG_CMD, FDCCMD_FORCI );
- udelay(500);
- FDC_READ( FDCREG_STATUS );
- udelay(20);
- }
-
- if (cnt > 0) {
- start_motor_off_timer();
- if (cnt == 1) fd_select_drive( 0 );
- start_check_change_timer();
- }
- }
- /*
- * floppy_open check for aliasing (/dev/fd0 can be the same as
- * /dev/PS0 etc), and disallows simultaneous access to the same
- * drive with different device numbers.
- */
- static int floppy_open( struct inode *inode, struct file *filp )
- {
- int drive, type;
- int old_dev;
- if (!filp) {
- DPRINT (("Weird, open called with filp=0n"));
- return -EIO;
- }
- drive = MINOR(inode->i_rdev) & 3;
- type = MINOR(inode->i_rdev) >> 2;
- DPRINT(("fd_open: type=%dn",type));
- if (drive >= FD_MAX_UNITS || type > NUM_DISK_MINORS)
- return -ENXIO;
- old_dev = fd_device[drive];
- if (fd_ref[drive] && old_dev != MINOR(inode->i_rdev))
- return -EBUSY;
- if (fd_ref[drive] == -1 || (fd_ref[drive] && filp->f_flags & O_EXCL))
- return -EBUSY;
- if (filp->f_flags & O_EXCL)
- fd_ref[drive] = -1;
- else
- fd_ref[drive]++;
- fd_device[drive] = MINOR(inode->i_rdev);
- if (old_dev && old_dev != MINOR(inode->i_rdev))
- invalidate_buffers(MKDEV(FLOPPY_MAJOR, old_dev));
- if (filp->f_flags & O_NDELAY)
- return 0;
- if (filp->f_mode & 3) {
- check_disk_change(inode->i_rdev);
- if (filp->f_mode & 2) {
- if (UD.wpstat) {
- floppy_release(inode, filp);
- return -EROFS;
- }
- }
- }
- return 0;
- }
- static int floppy_release( struct inode * inode, struct file * filp )
- {
- int drive = MINOR(inode->i_rdev) & 3;
- if (fd_ref[drive] < 0)
- fd_ref[drive] = 0;
- else if (!fd_ref[drive]--) {
- printk(KERN_ERR "floppy_release with fd_ref == 0");
- fd_ref[drive] = 0;
- }
- return 0;
- }
- static struct block_device_operations floppy_fops = {
- owner: THIS_MODULE,
- open: floppy_open,
- release: floppy_release,
- ioctl: fd_ioctl,
- check_media_change: check_floppy_change,
- revalidate: floppy_revalidate,
- };
- int __init atari_floppy_init (void)
- {
- int i;
- if (!MACH_IS_ATARI)
- /* Amiga, Mac, ... don't have Atari-compatible floppy :-) */
- return -ENXIO;
- if (MACH_IS_HADES)
- /* Hades doesn't have Atari-compatible floppy */
- return -ENXIO;
- if (register_blkdev(MAJOR_NR,"fd",&floppy_fops)) {
- printk(KERN_ERR "Unable to get major %d for floppyn",MAJOR_NR);
- return -EBUSY;
- }
- if (UseTrackbuffer < 0)
- /* not set by user -> use default: for now, we turn
- track buffering off for all Medusas, though it
- could be used with ones that have a counter
- card. But the test is too hard :-( */
- UseTrackbuffer = !MACH_IS_MEDUSA;
- /* initialize variables */
- SelectedDrive = -1;
- BufferDrive = -1;
- DMABuffer = atari_stram_alloc(BUFFER_SIZE+512, "ataflop");
- if (!DMABuffer) {
- printk(KERN_ERR "atari_floppy_init: cannot get dma buffern");
- unregister_blkdev(MAJOR_NR, "fd");
- return -ENOMEM;
- }
- TrackBuffer = DMABuffer + 512;
- PhysDMABuffer = virt_to_phys(DMABuffer);
- PhysTrackBuffer = virt_to_phys(TrackBuffer);
- BufferDrive = BufferSide = BufferTrack = -1;
- for (i = 0; i < FD_MAX_UNITS; i++) {
- unit[i].track = -1;
- unit[i].flags = 0;
- }
- for (i = 0; i < 256; i++)
- if ((i >> 2) > 0 && (i >> 2) <= NUM_DISK_MINORS) {
- int type = minor2disktype[(i >> 2) - 1].index;
- floppy_sizes[i] = disk_type[type].blocks >> 1;
- } else
- floppy_sizes[i] = MAX_DISK_SIZE;
- blk_size[MAJOR_NR] = floppy_sizes;
- blksize_size[MAJOR_NR] = floppy_blocksizes;
- blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
- printk(KERN_INFO "Atari floppy driver: max. %cD, %strack bufferingn",
- DriveType == 0 ? 'D' : DriveType == 1 ? 'H' : 'E',
- UseTrackbuffer ? "" : "no ");
- config_types();
- (void)do_floppy; /* avoid warning about unused variable */
- return 0;
- }
- void __init atari_floppy_setup( char *str, int *ints )
- {
- int i;
-
- if (ints[0] < 1) {
- printk(KERN_ERR "ataflop_setup: no arguments!n" );
- return;
- }
- else if (ints[0] > 2+FD_MAX_UNITS) {
- printk(KERN_ERR "ataflop_setup: too many argumentsn" );
- }
- if (ints[1] < 0 || ints[1] > 2)
- printk(KERN_ERR "ataflop_setup: bad drive typen" );
- else
- DriveType = ints[1];
- if (ints[0] >= 2)
- UseTrackbuffer = (ints[2] > 0);
- for( i = 3; i <= ints[0] && i-3 < FD_MAX_UNITS; ++i ) {
- if (ints[i] != 2 && ints[i] != 3 && ints[i] != 6 && ints[i] != 12)
- printk(KERN_ERR "ataflop_setup: bad stepraten" );
- else
- UserSteprate[i-3] = ints[i];
- }
- }
- #ifdef MODULE
- MODULE_LICENSE("GPL");
- int init_module (void)
- {
- if (!MACH_IS_ATARI)
- return -ENXIO;
- return atari_floppy_init ();
- }
- void cleanup_module (void)
- {
- unregister_blkdev(MAJOR_NR, "fd");
- blk_cleanup_queue(BLK_DEFAULT_QUEUE(MAJOR_NR));
- del_timer_sync(&fd_timer);
- atari_stram_free( DMABuffer );
- }
- #endif