cregit-Linux how code gets into the kernel

Release 4.7 drivers/block/ataflop.c

Directory: drivers/block
/*
 *  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/fd.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/mutex.h>
#include <linux/completion.h>
#include <linux/wait.h>

#include <asm/atafd.h>
#include <asm/atafdreg.h>
#include <asm/atariints.h>
#include <asm/atari_stdma.h>
#include <asm/atari_stram.h>


#define	FD_MAX_UNITS 2


#undef DEBUG

static DEFINE_MUTEX(ataflop_mutex);

static struct request *fd_request;

static int fdc_queue;

/* 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 ? */
} 
atari_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;

static DEFINE_SPINLOCK(ataflop_lock);

/* 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 ARRAY_SIZE(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];

/* 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 */
	
struct gendisk *disk;
	
int ref;
	
int type;
} 
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;                       \
    /* local_irq_save(__flags); */		\
    dma_wd.dma_mode_status = 0x80 | (reg);      \
    udelay(25);                                 \
    __val = dma_wd.fdc_acces_seccount;          \
    MFPDELAY();                                 \
    /* local_irq_restore(__flags); */		\
    __val & 0xff;                               \
})


#define FDC_WRITE(reg,val)			\
    do {                                    \
	/* unsigned long __flags; */		\
	/* local_irq_save(__flags); */		\
        dma_wd.dma_mode_status = 0x80 | (reg);  \
        udelay(25);                             \
        dma_wd.fdc_acces_seccount = (val);      \
        MFPDELAY();                             \
        /* local_irq_restore(__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_param(UseTrackbuffer, int, 0);


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_param_array(UserSteprate, int, NULL, 0);

/* Synchronization of FDC access. */

static volatile int fdc_busy = 0;
static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
static DECLARE_COMPLETION(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( unsigned long dummy );
static irqreturn_t floppy_irq (int irq, void *dummy);
static void fd_error( void );
static int do_format(int drive, int type, 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 setup_req_params( int drive );
static void redo_fd_request( void);
static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, 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 block_device *bdev, fmode_t mode);
static void floppy_release(struct gendisk *disk, fmode_t mode);

/************************* End of Prototypes **************************/

static DEFINE_TIMER(motor_off_timer, fd_motor_off_timer, 0, 0);
static DEFINE_TIMER(readtrack_timer, fd_readtrack_check, 0, 0);
static DEFINE_TIMER(timeout_timer, fd_times_out, 0, 0);
static DEFINE_TIMER(fd_timer, check_change, 0, 0);
	

static void fd_end_request_cur(int err) { if (!__blk_end_request_cur(fd_request, err)) fd_request = NULL; }

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static inline void start_motor_off_timer(void) { mod_timer(&motor_off_timer, jiffies + FD_MOTOR_OFF_DELAY); MotorOffTrys = 0; }

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static inline void start_check_change_timer( void ) { mod_timer(&fd_timer, jiffies + CHECK_CHANGE_DELAY); }

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static inline void start_timeout(void) { mod_timer(&timeout_timer, jiffies + FLOPPY_TIMEOUT); }

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static inline void stop_timeout(void) { del_timer(&timeout_timer); }

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/* Select the side to use. */
static void fd_select_side( int side ) { unsigned long flags; /* protect against various other ints mucking around with the PSG */ local_irq_save(flags); 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; local_irq_restore(flags); }

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/* 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; /* protect against various other ints mucking around with the PSG */ local_irq_save(flags); 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; local_irq_restore(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; }

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/* Deselect both drives. */
static void fd_deselect( void ) { unsigned long flags; /* protect against various other ints mucking around with the PSG */ local_irq_save(flags); 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; local_irq_restore(flags); }

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/* 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)); }

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/* 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( unsigned long dummy ) { static int drive = 0; unsigned long flags; unsigned char old_porta; int stat; if (++drive > 1 || !UD.connected) drive = 0; /* protect against various other ints mucking around with the PSG */ local_irq_save(flags); 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] = %d\n", drive, stat )); UD.wpstat = stat; set_bit (drive, &changed_floppies); } } local_irq_restore(flags); start_check_change_timer(); }

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/* 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; }

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static inline int get_head_settle_flag(void) { int tmp = HeadSettleFlag; HeadSettleFlag = 0; return( tmp ); }

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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++; }

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/* General Interrupt Handling */ static void (*FloppyIRQHandler)( int status ) = NULL;
static irqreturn_t floppy_irq (int irq, void *dummy) { unsigned char status; void (*handler)( int ); handler = xchg(&FloppyIRQHandler, NULL); if (handler) { nop(); status = FDC_READ( FDCREG_STATUS ); DPRINT(("FDC irq, status = %02x handler = %08lx\n",status,(unsigned long)handler)); handler( status ); } else { DPRINT(("FDC irq, no handler\n")); } return IRQ_HANDLED; }

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/* 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; complete(&format_wait); return; } if (!fd_request) return; fd_request->errors++; if (fd_request->errors >= MAX_ERRORS) { printk(KERN_ERR "fd%d: too many errors.\n", SelectedDrive ); fd_end_request_cur(-EIO); } else if (fd_request->errors == RECALIBRATE_ERRORS) { printk(KERN_WARNING "fd%d: recalibrating\n", SelectedDrive ); if (SelectedDrive != -1) SUD.track = -1; } redo_fd_request(); }

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Total100100.00%6100.00%

#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(int drive, int type, struct atari_format_descr *desc) { unsigned char *p; int sect, nsect; unsigned long flags; DPRINT(("do_format( dr=%d tr=%d he=%d offs=%d )\n", drive, desc->track, desc->head, desc->sect_offset )); wait_event(fdc_wait, cmpxchg(&fdc_busy, 0, 1) == 0); local_irq_save(flags); stdma_lock(floppy_irq, NULL); atari_turnon_irq( IRQ_MFP_FDC ); /* should be already, just to be sure */ local_irq_restore(flags); if (type) { if (--type >= NUM_DISK_MINORS || minor2disktype[type].drive_types > DriveType) { redo_fd_request(); return -EINVAL; } type = minor2disktype[type].index; UDT = &atari_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 ); wait_for_completion(&format_wait); redo_fd_request(); return( FormatError ? -EIO : 0 ); }

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pre-gitpre-git36993.89%120.00%
arnd bergmannarnd bergmann174.33%120.00%
al viroal viro51.27%120.00%
geert uytterhoevengeert uytterhoeven20.51%240.00%
Total393100.00%5100.00%

/* 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_action\n")); if (UseTrackbuffer && !IsFormatting) { repeat: if (IS_BUFFERED( drive, ReqSide, ReqTrack )) { if (ReqCmd == READ) { copy_buffer( SECTOR_BUFFER(ReqSector), ReqData ); if (++ReqCnt < blk_rq_cur_sectors(fd_request)) { /* read next sector */ setup_req_params( drive ); goto repeat; } else { /* all sectors finished */ fd_end_request_cur(0); 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(); }

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pre-gitpre-git15196.18%125.00%
tejun heotejun heo63.82%375.00%
Total157100.00%4100.00%

/* 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_calibrate\n")); 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 */ }

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pre-gitpre-git75100.00%2100.00%
Total75100.00%2100.00%


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 failed\n", SelectedDrive ); fd_error(); } else { SUD.track = 0; fd_seek(); } }

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pre-gitpre-git66100.00%3100.00%
Total66100.00%3100.00%

/* 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 %d\n",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 */ }

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pre-gitpre-git99100.00%2100.00%
Total99100.00%2100.00%


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(); } }

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pre-gitpre-git92100.00%3100.00%
Total92100.00%3100.00%

/* 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=%c\n",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 */ local_irq_save(flags); 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(); local_irq_restore(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(); }

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pre-gitpre-git39999.50%480.00%
geert uytterhoevengeert uytterhoeven20.50%120.00%
Total401100.00%5100.00%


static void fd_readtrack_check( unsigned long dummy ) { unsigned long flags, addr, addr2; local_irq_save(flags); 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. */ local_irq_restore(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; local_irq_restore(flags); DPRINT(("fd_readtrack_check(): done\n")); 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 */ local_irq_restore(flags); DPRINT(("fd_readtrack_check(): not yet finished\n")); mod_timer(&readtrack_timer, jiffies + HZ/5/10); } }

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pre-gitpre-git19698.00%375.00%
geert uytterhoevengeert uytterhoeven42.00%125.00%
Total200100.00%4100.00%


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); }

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pre-gitpre-git43100.00%2100.00%
Total43100.00%2100.00%


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 error\n", SelectedDrive ); goto err_end; } } MFPDELAY(); if (ReqCmd == WRITE && (status & FDCSTAT_WPROT)) { printk(KERN_NOTICE "fd%d: is write protected\n", 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 > atari_disk_type) { if (SUDT[-1].blocks > ReqBlock) { /* try another disk type */ SUDT--; set_capacity(unit[SelectedDrive].disk, SUDT->blocks); } else Probing = 0; } else { if (SUD.flags & FTD_MSG) printk(KERN_INFO "fd%d: Auto-detected floppy type %s\n", SelectedDrive, SUDT->name ); Probing=0; } } else { /* record not found, but not probing. Maybe stretch wrong ? Restart probing */ if (SUD.autoprobe) { SUDT = atari_disk_type + StartDiskType[DriveType]; set_capacity(unit[SelectedDrive].disk, SUDT->blocks); 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 < blk_rq_cur_sectors(fd_request)) { /* read next sector */ setup_req_params( SelectedDrive ); do_fd_action( SelectedDrive ); } else { /* all sectors finished */ fd_end_request_cur(0); redo_fd_request(); } return; err_end: BufferDrive = -1; fd_error(); }

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PersonTokensPropCommitsCommitProp
pre-gitpre-git49895.77%654.55%
al viroal viro142.69%19.09%
tejun heotejun heo61.15%327.27%
geert uytterhoevengeert uytterhoeven20.38%19.09%
Total520100.00%11100.00%


static void fd_writetrack( void ) { unsigned long paddr, flags; unsigned int track; DPRINT(("fd_writetrack() Tr=%d Si=%d\n", 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 */ local_irq_save(flags); 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(); local_irq_restore(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 */ }

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pre-gitpre-git23299.15%375.00%
geert uytterhoevengeert uytterhoeven20.85%125.00%
Total234100.00%4100.00%


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 protected\n", 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; } complete(&format_wait); return; err_end: fd_error(); }

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pre-gitpre-git7298.63%375.00%
arnd bergmannarnd bergmann11.37%125.00%
Total73100.00%4100.00%


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 timeout\n" ); fd_error(); end: atari_enable_irq( IRQ_MFP_FDC ); }

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pre-gitpre-git68100.00%3100.00%
Total68100.00%3100.00%

/* 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 started\n")); 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. */ } }

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pre-gitpre-git59100.00%3100.00%
Total59100.00%3100.00%


static void finish_fdc_done( int dummy ) { unsigned long flags; DPRINT(("finish_fdc_done entered\n")); 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(); local_irq_save(flags); stdma_release(); fdc_busy = 0; wake_up( &fdc_wait ); local_irq_restore(flags); DPRINT(("finish_fdc() finished\n")); }

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pre-gitpre-git9297.87%375.00%
geert uytterhoevengeert uytterhoeven22.13%125.00%
Total94100.00%4100.00%

/* 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 unsigned int floppy_check_events(struct gendisk *disk, unsigned int clearing) { struct atari_floppy_struct *p = disk->private_data; unsigned int drive = p - unit; if (test_bit (drive, &fake_change)) { /* simulated change (e.g. after formatting) */ return DISK_EVENT_MEDIA_CHANGE; } if (test_bit (drive, &changed_floppies)) { /* surely changed (the WP signal changed at least once) */ return DISK_EVENT_MEDIA_CHANGE; } if (UD.wpstat) { /* WP is on -> could be changed: to be sure, buffers should be * invalidated... */ return DISK_EVENT_MEDIA_CHANGE; } return 0; }

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pre-gitpre-git5568.75%133.33%
al viroal viro1620.00%133.33%
tejun heotejun heo911.25%133.33%
Total80100.00%3100.00%


static int floppy_revalidate(struct gendisk *disk) { struct atari_floppy_struct *p = disk->private_data; unsigned int drive = p - unit; if (test_bit(drive, &changed_floppies) || test_bit(drive, &fake_change) || p->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 = NULL; else UDT = &default_params[drive]; } return 0; }

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PersonTokensPropCommitsCommitProp
pre-gitpre-git9983.19%350.00%
al viroal viro2016.81%350.00%
Total119100.00%6100.00%

/* 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 && fd_request->errors == 0); else read_track = 0; DPRINT(("Request params: Si=%d Tr=%d Se=%d Data=%08lx\n",ReqSide, ReqTrack, ReqSector, (unsigned long)ReqData )); }

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PersonTokensPropCommitsCommitProp
pre-gitpre-git9396.88%133.33%
martin daleckimartin dalecki22.08%133.33%
tejun heotejun heo11.04%133.33%
Total96100.00%3100.00%

/* * Round-robin between our available drives, doing one request from each */
static struct request *set_next_request(void) { struct request_queue *q; int old_pos = fdc_queue; struct request *rq = NULL; do { q = unit[fdc_queue].disk->queue; if (++fdc_queue == FD_MAX_UNITS) fdc_queue = 0; if (q) { rq = blk_fetch_request(q); if (rq) break; } } while (fdc_queue != old_pos); return rq; }

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vivek goyalvivek goyal80100.00%2100.00%
Total80100.00%2100.00%


static void redo_fd_request(void) { int drive, type; struct atari_floppy_struct *floppy; DPRINT(("redo_fd_request: fd_request=%p dev=%s fd_request->sector=%ld\n", fd_request, fd_request ? fd_request->rq_disk->disk_name : "", fd_request ? blk_rq_pos(fd_request) : 0 )); IsFormatting = 0; repeat: if (!fd_request) { fd_request = set_next_request(); if (!fd_request) goto the_end; } floppy = fd_request->rq_disk->private_data; drive = floppy - unit; type = floppy->type; if (!UD.connected) { /* drive not connected */ printk(KERN_ERR "Unknown Device: fd%d\n", drive ); fd_end_request_cur(-EIO); goto repeat; } if (type == 0) { if (!UDT) { Probing = 1; UDT = atari_disk_type + StartDiskType[DriveType]; set_capacity(floppy->disk, UDT->blocks); UD.autoprobe = 1; } } else { /* user supplied disk type */ if (--type >= NUM_DISK_MINORS) { printk(KERN_WARNING "fd%d: invalid disk format", drive ); fd_end_request_cur(-EIO); goto repeat; } if (minor2disktype[type].drive_types > DriveType) { printk(KERN_WARNING "fd%d: unsupported disk format", drive ); fd_end_request_cur(-EIO); goto repeat; } type = minor2disktype[type].index; UDT = &atari_disk_type[type]; set_capacity(floppy->disk, UDT->blocks); UD.autoprobe = 0; } if (blk_rq_pos(fd_request) + 1 > UDT->blocks) { fd_end_request_cur(-EIO); goto repeat; } /* stop deselect timer */ del_timer( &motor_off_timer ); ReqCnt = 0; ReqCmd = rq_data_dir(fd_request); ReqBlock = blk_rq_pos(fd_request); ReqBuffer = bio_data(fd_request->bio); setup_req_params( drive ); do_fd_action( drive ); return; the_end: finish_fdc(); }

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PersonTokensPropCommitsCommitProp
pre-gitpre-git24373.19%213.33%
tejun heotejun heo4312.95%320.00%
al viroal viro339.94%426.67%
geert uytterhoevengeert uytterhoeven51.51%213.33%
jens axboejens axboe51.51%213.33%
vivek goyalvivek goyal20.60%16.67%
martin daleckimartin dalecki10.30%16.67%
Total332100.00%15100.00%


void do_fd_request(struct request_queue * q) { DPRINT(("do_fd_request for pid %d\n",current->pid)); wait_event(fdc_wait, cmpxchg(&fdc_busy, 0, 1) == 0); stdma_lock(floppy_irq, NULL); atari_disable_irq( IRQ_MFP_FDC ); redo_fd_request(); atari_enable_irq( IRQ_MFP_FDC ); }

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PersonTokensPropCommitsCommitProp
pre-gitpre-git4475.86%250.00%
arnd bergmannarnd bergmann1220.69%125.00%
jens axboejens axboe23.45%125.00%
Total58100.00%4100.00%


static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long param) { struct gendisk *disk = bdev->bd_disk; struct atari_floppy_struct *floppy = disk->private_data; int drive = floppy - unit; int type = floppy->type; struct atari_format_descr fmt_desc; struct atari_disk_type *dtp; struct floppy_struct getprm; int settype; struct floppy_struct setprm; void __user *argp = (void __user *)param; switch (cmd) { case FDGETPRM: if (type) { if (--type >= NUM_DISK_MINORS) return -ENODEV; if (minor2disktype[type].drive_types > DriveType) return -ENODEV; type = minor2disktype[type].index; dtp = &atari_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; } 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(argp, &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 (floppy->ref != 1 && floppy->ref != -1) return -EBUSY; if (copy_from_user(&setprm, argp, sizeof(setprm))) return -EFAULT; /* * first of all: check for floppy change and revalidate, * or the next access will revalidate - and clear UDT :-( */ if (floppy_check_events(disk, 0)) floppy_revalidate(disk); 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 = &atari_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; set_capacity(floppy->disk, UDT->blocks); 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 (setprm.track != dtp->blocks/dtp->spt/2 || setprm.head != 2) { redo_fd_request(); return -EINVAL; } UDT = dtp; set_capacity(floppy->disk, UDT->blocks); 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 (floppy->ref != 1 && floppy->ref != -1) return -EBUSY; if (copy_from_user(&fmt_desc, argp, sizeof(fmt_desc))) return -EFAULT; return do_format(drive, type, &fmt_desc); case FDCLRPRM: UDT = NULL; /* MSch: invalidate default_params */ default_params[drive].blocks = 0; set_capacity(floppy->disk, MAX_DISK_SIZE * 2); case FDFMTEND: case FDFLUSH: /* invalidate the buffer track to force a reread */ BufferDrive = -1; set_bit(drive, &fake_change); check_disk_change(bdev); return 0; default: return -EINVAL; } }

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PersonTokensPropCommitsCommitProp
pre-gitpre-git75286.44%321.43%
al viroal viro10512.07%750.00%
geert uytterhoevengeert uytterhoeven91.03%214.29%
tejun heotejun heo30.34%17.14%
arnd bergmannarnd bergmann10.11%17.14%
Total870100.00%14100.00%


static int fd_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg) { int ret; mutex_lock(&ataflop_mutex); ret = fd_locked_ioctl(bdev, mode, cmd, arg); mutex_unlock(&ataflop_mutex); return ret; }

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PersonTokensPropCommitsCommitProp
arnd bergmannarnd bergmann53100.00%2100.00%
Total53100.00%2100.00%

/* 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! */ }

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PersonTokensPropCommitsCommitProp
pre-gitpre-git120100.00%3100.00%
Total120100.00%3100.00%

/* 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 (!(st_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( st_mfp.par_dt_reg & 0x20 ) ; status = FDC_READ( FDCREG_STATUS ); } atari_turnon_irq( IRQ_MFP_FDC ); return( ok ); }

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PersonTokensPropCommitsCommitProp
pre-gitpre-git18798.94%583.33%
geert uytterhoevengeert uytterhoeven21.06%116.67%
Total189100.00%6100.00%

/* 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%d\n", 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(); } }

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pre-gitpre-git134100.00%4100.00%
Total134100.00%4100.00%

/* * 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 block_device *bdev, fmode_t mode) { struct atari_floppy_struct *p = bdev->bd_disk->private_data; int type = MINOR(bdev->bd_dev) >> 2; DPRINT(("fd_open: type=%d\n",type)); if (p->ref && p->type != type) return -EBUSY; if (p->ref == -1 || (p->ref && mode & FMODE_EXCL)) return -EBUSY; if (mode & FMODE_EXCL) p->ref = -1; else p->ref++; p->type = type; if (mode & FMODE_NDELAY) return 0; if (mode & (FMODE_READ|FMODE_WRITE)) { check_disk_change(bdev); if (mode & FMODE_WRITE) { if (p->wpstat) { if (p->ref < 0) p->ref = 0; else p->ref--; return -EROFS; } } } return 0; }

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PersonTokensPropCommitsCommitProp
pre-gitpre-git9754.19%225.00%
al viroal viro8245.81%675.00%
Total179100.00%8100.00%


static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode) { int ret; mutex_lock(&ataflop_mutex); ret = floppy_open(bdev, mode); mutex_unlock(&ataflop_mutex); return ret; }

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arnd bergmannarnd bergmann41100.00%2100.00%
Total41100.00%2100.00%


static void floppy_release(struct gendisk *disk, fmode_t mode) { struct atari_floppy_struct *p = disk->private_data; mutex_lock(&ataflop_mutex); if (p->ref < 0) p->ref = 0; else if (!p->ref--) { printk(KERN_ERR "floppy_release with fd_ref == 0"); p->ref = 0; } mutex_unlock(&ataflop_mutex); }

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pre-gitpre-git3650.00%337.50%
al viroal viro2433.33%337.50%
arnd bergmannarnd bergmann1216.67%225.00%
Total72100.00%8100.00%

static const struct block_device_operations floppy_fops = { .owner = THIS_MODULE, .open = floppy_unlocked_open, .release = floppy_release, .ioctl = fd_ioctl, .check_events = floppy_check_events, .revalidate_disk= floppy_revalidate, };
static struct kobject *floppy_find(dev_t dev, int *part, void *data) { int drive = *part & 3; int type = *part >> 2; if (drive >= FD_MAX_UNITS || type > NUM_DISK_MINORS) return NULL; *part = 0; return get_disk(unit[drive].disk); }

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al viroal viro64100.00%4100.00%
Total64100.00%4100.00%


static int __init atari_floppy_init (void) { int i; if (!MACH_IS_ATARI) /* Amiga, Mac, ... don't have Atari-compatible floppy :-) */ return -ENODEV; if (register_blkdev(FLOPPY_MAJOR,"fd")) return -EBUSY; for (i = 0; i < FD_MAX_UNITS; i++) { unit[i].disk = alloc_disk(1); if (!unit[i].disk) goto Enomem; } 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 buffer\n"); goto Enomem; } TrackBuffer = DMABuffer + 512; PhysDMABuffer = atari_stram_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; unit[i].disk->major = FLOPPY_MAJOR; unit[i].disk->first_minor = i; sprintf(unit[i].disk->disk_name, "fd%d", i); unit[i].disk->fops = &floppy_fops; unit[i].disk->private_data = &unit[i]; unit[i].disk->queue = blk_init_queue(do_fd_request, &ataflop_lock); if (!unit[i].disk->queue) goto Enomem; set_capacity(unit[i].disk, MAX_DISK_SIZE * 2); add_disk(unit[i].disk); } blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE, floppy_find, NULL, NULL); printk(KERN_INFO "Atari floppy driver: max. %cD, %strack buffering\n", DriveType == 0 ? 'D' : DriveType == 1 ? 'H' : 'E', UseTrackbuffer ? "" : "no "); config_types(); return 0; Enomem: while (i--) { struct request_queue *q = unit[i].disk->queue; put_disk(unit[i].disk); if (q) blk_cleanup_queue(q); } unregister_blkdev(FLOPPY_MAJOR, "fd"); return -ENOMEM; }

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PersonTokensPropCommitsCommitProp
pre-gitpre-git18945.65%529.41%
al viroal viro17241.55%741.18%
vivek goyalvivek goyal409.66%15.88%
jens axboejens axboe71.69%15.88%
christoph hellwigchristoph hellwig40.97%15.88%
geert uytterhoevengeert uytterhoeven10.24%15.88%
michael schmitzmichael schmitz10.24%15.88%
Total414100.00%17100.00%

#ifndef MODULE
static int __init atari_floppy_setup(char *str) { int ints[3 + FD_MAX_UNITS]; int i; if (!MACH_IS_ATARI) return 0; str = get_options(str, 3 + FD_MAX_UNITS, ints); if (ints[0] < 1) { printk(KERN_ERR "ataflop_setup: no arguments!\n" ); return 0; } else if (ints[0] > 2+FD_MAX_UNITS) { printk(KERN_ERR "ataflop_setup: too many arguments\n" ); } if (ints[1] < 0 || ints[1] > 2) printk(KERN_ERR "ataflop_setup: bad drive type\n" ); 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 steprate\n" ); else UserSteprate[i-3] = ints[i]; } return 1; }

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PersonTokensPropCommitsCommitProp
pre-gitpre-git17282.30%375.00%
al viroal viro3717.70%125.00%
Total209100.00%4100.00%

__setup("floppy=", atari_floppy_setup); #endif
static void __exit atari_floppy_exit(void) { int i; blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256); for (i = 0; i < FD_MAX_UNITS; i++) { struct request_queue *q = unit[i].disk->queue; del_gendisk(unit[i].disk); put_disk(unit[i].disk); blk_cleanup_queue(q); } unregister_blkdev(FLOPPY_MAJOR, "fd"); del_timer_sync(&fd_timer); atari_stram_free( DMABuffer ); }

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PersonTokensPropCommitsCommitProp
al viroal viro5254.17%550.00%
pre-gitpre-git2323.96%330.00%
vivek goyalvivek goyal1919.79%110.00%
christoph hellwigchristoph hellwig22.08%110.00%
Total96100.00%10100.00%

module_init(atari_floppy_init) module_exit(atari_floppy_exit) MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git690684.09%1926.03%
al viroal viro6958.46%2027.40%
arnd bergmannarnd bergmann1571.91%45.48%
vivek goyalvivek goyal1461.78%22.74%
geert uytterhoevengeert uytterhoeven1201.46%912.33%
tejun heotejun heo1021.24%45.48%
andrew mortonandrew morton240.29%11.37%
ingo molnaringo molnar160.19%11.37%
jens axboejens axboe160.19%45.48%
rusty russellrusty russell100.12%11.37%
christoph hellwigchristoph hellwig60.07%11.37%
linus torvaldslinus torvalds50.06%22.74%
thomas gleixnerthomas gleixner40.05%11.37%
martin daleckimartin dalecki30.04%11.37%
michael schmitzmichael schmitz10.01%11.37%
alexey dobriyanalexey dobriyan10.01%11.37%
tobias klausertobias klauser10.01%11.37%
Total8213100.00%73100.00%
Directory: drivers/block
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