28  *   - Initialize track register when testing presence of floppy
51  *  - increase gap size at start of track for HD/ED disks
93 #define FDCSELREG_TRA   (0x82)   /* track register */
127 #define FDCCMDADD_U     (0x10)   /* update track register */
141 #define	FDCSTAT_TR00	(0x04)   /* Track 00 flag (Type I) */
162 	int track;		/* to be formatted */  member
170 	unsigned	spt;		/* sectors per track */
173 	unsigned 	stretch;	/* track doubling ? */
294 	int track;		/* current head position or -1 if  member
338  * operations. Second, a track buffer is used to cache a whole track
340  * because that allows write operations without clearing the track buffer.
355 static int UseTrackbuffer = -1;		  /* Do track buffering? */
364 #define	IS_BUFFERED(drive,side,track) \  argument
365     (BufferDrive == (drive) && BufferSide == (side) && BufferTrack == (track))
504 /* Select a drive, update the FDC's track register and set the correct
524 	/* restore track register to saved value */  in fd_select_drive()
525 	FDC_WRITE( FDCREG_TRACK, UD.track );  in fd_select_drive()
594  * as possible) and keep track of the current state of the write protection.
707 			SUD.track = -1;  in fd_error()
750 	if (!UDT || desc->track >= UDT->blocks/UDT->spt/2 || desc->head >= 2) {  in do_format()
757 	/* The track buffer is used for the raw track data, so its  in do_format()
768 		*p++ = desc->track;  in do_format()
785 	ReqTrack = desc->track;  in do_format()
800  * required parameter settings (drive select, side select, track
829 		    /* cmd == WRITE, pay attention to track buffer  in do_fd_action()
839 	if (UD.track == -1)  in do_fd_action()
841 	else if (UD.track != ReqTrack << UDT->stretch)  in do_fd_action()
850 /* Seek to track 0 if the current track is unknown */
854 	if (SUD.track >= 0) {  in fd_calibrate()
886 		SUD.track = 0;  in fd_calibrate_done()
892 /* Seek the drive to the requested track. The drive must have been
898 	if (SUD.track == ReqTrack << SUDT->stretch) {  in fd_seek()
908 	DPRINT(("fd_seek() to track %d\n",ReqTrack));  in fd_seek()
930 		printk(KERN_ERR "fd%d: seek error (to track %d)\n",  in fd_seek_done()
932 		/* we don't know exactly which track we are on now! */  in fd_seek_done()
933 		SUD.track = -1;  in fd_seek_done()
937 		SUD.track = ReqTrack << SUDT->stretch;  in fd_seek_done()
948  * over the correct track.
958 	unsigned int track;  in fd_rwsec()  local
986 	/* Cheat for track if stretch != 0 */  in fd_rwsec()
988 		track = FDC_READ( FDCREG_TRACK);  in fd_rwsec()
990 		FDC_WRITE( FDCREG_TRACK, track >> SUDT->stretch);  in fd_rwsec()
1036 		/* If reading a whole track, wait about one disk rotation and  in fd_rwsec()
1123 	unsigned int track;  in fd_rwsec_done1()  local
1127 	/* Correct the track if stretch != 0 */  in fd_rwsec_done1()
1129 		track = FDC_READ( FDCREG_TRACK);  in fd_rwsec_done1()
1131 		FDC_WRITE( FDCREG_TRACK, track << SUDT->stretch);  in fd_rwsec_done1()
1188 		printk(KERN_ERR "fd%d: sector %d not found (side %d, track %d)\n",  in fd_rwsec_done1()
1193 		printk(KERN_ERR "fd%d: CRC error (side %d, track %d, sector %d)\n",  in fd_rwsec_done1()
1198 		printk(KERN_ERR "fd%d: lost data (side %d, track %d, sector %d)\n",  in fd_rwsec_done1()
1241 	unsigned int track;  in fd_writetrack()  local
1250 	/* Cheat for track if stretch != 0 */  in fd_writetrack()
1252 		track = FDC_READ( FDCREG_TRACK);  in fd_writetrack()
1254 		FDC_WRITE(FDCREG_TRACK,track >> SUDT->stretch);  in fd_writetrack()
1308 		printk(KERN_ERR "fd%d: lost data (side %d, track %d)\n",  in fd_writetrack_done()
1344  * no matter what :-( To save time, the seek goes to the track we're
1355 		FDC_WRITE (FDCREG_DATA, SUD.track);  in finish_fdc()
1596 		getprm.track = dtp->blocks/dtp->spt/2;  in fd_locked_ioctl()
1700 		if (setprm.track != dtp->blocks/dtp->spt/2 ||  in fd_locked_ioctl()
1732 		/* invalidate the buffer track to force a reread */  in fd_locked_ioctl()
1766 	UD.track     = 0;  in fd_probe()
2007 		   track buffering off for all Medusas, though it  in atari_floppy_init()
2028 		unit[i].track = -1;  in atari_floppy_init()