fd1772.c
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- /*
- * linux/kernel/arch/arm/drivers/block/fd1772.c
- * Based on ataflop.c in the m68k Linux
- * Copyright (C) 1993 Greg Harp
- * Atari Support by Bjoern Brauel, Roman Hodek
- * Archimedes Support by Dave Gilbert (linux@treblig.org)
- *
- * 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 FDC1772CMDADD_H flag since
- * the FDC1772 will otherwise wait forever when no disk is inserted...
- *
- * Things left to do:
- * - Formatting
- * - Maybe a better strategy for disk change detection (does anyone
- * know one?)
- * - There are some strange problems left: The strangest one is
- * that, at least on my TT (4+4MB), the first 2 Bytes of the last
- * page of the TT-Ram (!) change their contents (some bits get
- * set) while a floppy DMA is going on. But there are no accesses
- * to these memory locations from the kernel... (I tested that by
- * making the page read-only). I cannot explain what's going on...
- * - Sometimes the drive-change-detection stops to work. The
- * function is still called, but the WP bit always reads as 0...
- * Maybe a problem with the status reg mode or a timing problem.
- * Note 10/12/94: The change detection now seems to work reliably.
- * There is no proof, but I've seen no hang for a long time...
- *
- * ARCHIMEDES changes: (gilbertd@cs.man.ac.uk)
- * 26/12/95 - Changed all names starting with FDC to FDC1772
- * Removed all references to clock speed of FDC - we're stuck with 8MHz
- * Modified disk_type structure to remove HD formats
- *
- * 7/ 1/96 - Wrote FIQ code, removed most remaining atariisms
- *
- * 13/ 1/96 - Well I think its read a single sector; but there is a problem
- * fd_rwsec_done which is called in FIQ mode starts another transfer
- * off (in fd_rwsec) while still in FIQ mode. Because its still in
- * FIQ mode it can't service the DMA and loses data. So need to
- * heavily restructure.
- * 14/ 1/96 - Found that the definitions of the register numbers of the
- * FDC were multiplied by 2 in the header for the 16bit words
- * of the atari so half the writes were going in the wrong place.
- * Also realised that the FIQ entry didn't make any attempt to
- * preserve registers or return correctly; now in assembler.
- *
- * 11/ 2/96 - Hmm - doesn't work on real machine. Auto detect doesn't
- * and hacking that past seems to wait forever - check motor
- * being turned on.
- *
- * 17/ 2/96 - still having problems - forcing track to -1 when selecting
- * new drives seems to allow it to read first few sectors
- * but then we get solid hangs at apparently random places
- * which change depending what is happening.
- *
- * 9/ 3/96 - Fiddled a lot of stuff around to move to kernel 1.3.35
- * A lot of fiddling in DMA stuff. Having problems with it
- * constnatly thinking its timeing out. Ah - its timeout
- * was set to (6*HZ) rather than jiffies+(6*HZ). Now giving
- * duff data!
- *
- * 5/ 4/96 - Made it use the new IOC_ macros rather than *ioc
- * Hmm - giving unexpected FIQ and then timeouts
- * 18/ 8/96 - Ran through indent -kr -i8
- * Some changes to disc change detect; don't know how well it
- * works.
- * 24/ 8/96 - Put all the track buffering code back in from the atari
- * code - I wonder if it will still work... No :-)
- * Still works if I turn off track buffering.
- * 25/ 8/96 - Changed the timer expires that I'd added back to be
- * jiffies + ....; and it all sprang to life! Got 2.8K/sec
- * off a cp -r of a 679K disc (showed 94% cpu usage!)
- * (PC gets 14.3K/sec - 0% CPU!) Hmm - hard drive corrupt!
- * Also perhaps that compile was with cache off.
- * changed cli in fd_readtrack_check to cliIF
- * changed vmallocs to kmalloc (whats the difference!!)
- * Removed the busy wait loop in do_fd_request and replaced
- * by a routine on tq_immediate; only 11% cpu on a dd off the
- * raw disc - but the speed is the same.
- * 1/ 9/96 - Idea (failed!) - set the 'disable spin-up seqeunce'
- * when we read the track if we know the motor is on; didn't
- * help - perhaps we have to do it in stepping as well.
- * Nope. Still doesn't help.
- * Hmm - what seems to be happening is that fd_readtrack_check
- * is never getting called. Its job is to terminate the read
- * just after we think we should have got the data; otherwise
- * the fdc takes 1 second to timeout; which is what's happening
- * Now I can see 'readtrack_timer' being set (which should do the
- * call); but it never seems to be called - hmm!
- * OK - I've moved the check to my tq_immediate code -
- * and it WORKS! 13.95K/second at 19% CPU.
- * I wish I knew why that timer didn't work.....
- *
- * 16/11/96 - Fiddled and frigged for 2.0.18
- *
- * DAG 30/01/99 - Started frobbing for 2.2.1
- * DAG 20/06/99 - A little more frobbing:
- * Included include/asm/uaccess.h for get_user/put_user
- *
- * DAG 1/09/00 - Dusted off for 2.4.0-test7
- * MAX_SECTORS was name clashing so it is now FD1772_...
- * Minor parameter, name layouts for 2.4.x differences
- */
- #include <linux/sched.h>
- #include <linux/fs.h>
- #include <linux/fcntl.h>
- #include <linux/slab.h>
- #include <linux/kernel.h>
- #include <linux/interrupt.h>
- #include <linux/timer.h>
- #include <linux/tqueue.h>
- #include <linux/fd.h>
- #include <linux/fd1772.h>
- #include <linux/errno.h>
- #include <linux/types.h>
- #include <linux/delay.h>
- #include <linux/mm.h>
- #include <asm/arch/oldlatches.h>
- #include <asm/bitops.h>
- #include <asm/dma.h>
- #include <asm/hardware.h>
- #include <asm/hardware/ioc.h>
- #include <asm/io.h>
- #include <asm/irq.h>
- #include <asm/mach-types.h>
- #include <asm/pgtable.h>
- #include <asm/system.h>
- #include <asm/uaccess.h>
- #define MAJOR_NR FLOPPY_MAJOR
- #define FLOPPY_DMA 0
- #include <linux/blk.h>
- /* Note: FD_MAX_UNITS could be redefined to 2 for the Atari (with
- * little additional rework in this file). But I'm not yet sure if
- * some other code depends on the number of floppies... (It is defined
- * in a public header!)
- */
- #if 0
- #undef FD_MAX_UNITS
- #define FD_MAX_UNITS 2
- #endif
- /* Ditto worries for Arc - DAG */
- #define FD_MAX_UNITS 4
- #define TRACKBUFFER 0
- /*#define DEBUG*/
- #ifdef DEBUG
- #define DPRINT(a) printk a
- #else
- #define DPRINT(a)
- #endif
- /* Disk types: DD */
- static struct archy_disk_type {
- const char *name;
- unsigned spt; /* sectors per track */
- unsigned blocks; /* total number of blocks */
- unsigned stretch; /* track doubling ? */
- } disk_type[] = {
- { "d360", 9, 720, 0 }, /* 360kB diskette */
- { "D360", 9, 720, 1 }, /* 360kb in 720kb drive */
- { "D720", 9, 1440, 0 }, /* 720kb diskette (DD) */
- /*{ "D820", 10,1640, 0}, *//* DD disk with 82 tracks/10 sectors
- - DAG - can't see how type detect can distinguish this
- from 720K until it reads block 4 by which time its too late! */
- };
- #define NUM_DISK_TYPES (sizeof(disk_type)/sizeof(*disk_type))
- /*
- * Maximum disk size (in kilobytes). This default is used whenever the
- * current disk size is unknown.
- */
- #define MAX_DISK_SIZE 720
- static int floppy_sizes[256];
- static int floppy_blocksizes[256];
- /* current info on each unit */
- static struct archy_floppy_struct {
- int connected; /* !=0 : drive is connected */
- int autoprobe; /* !=0 : do autoprobe */
- struct archy_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) */
- } unit[FD_MAX_UNITS];
- /* DAG: On Arc we spin on a flag being cleared by fdc1772_comendhandler which
- is an assembler routine */
- extern void fdc1772_comendhandler(void); /* Actually doens't have these parameters - see fd1772.S */
- extern volatile int fdc1772_comendstatus;
- extern volatile int fdc1772_fdc_int_done;
- #define FDC1772BASE ((0x210000>>2)|0x80000000)
- #define FDC1772_READ(reg) inb(FDC1772BASE+(reg/2))
- /* DAG: You wouldn't be silly to ask why FDC1772_WRITE is a function rather
- than the #def below - well simple - the #def won't compile - and I
- don't understand why (__outwc not defined) */
- /* NOTE: Reg is 0,2,4,6 as opposed to 0,1,2,3 or 0,4,8,12 to keep compatibility
- with the ST version of fd1772.h */
- /*#define FDC1772_WRITE(reg,val) outw(val,(reg+FDC1772BASE)); */
- void FDC1772_WRITE(int reg, unsigned char val)
- {
- if (reg == FDC1772REG_CMD) {
- DPRINT(("FDC1772_WRITE new command 0x%x @ %dn", val,jiffies));
- if (fdc1772_fdc_int_done) {
- DPRINT(("FDC1772_WRITE: Hmm fdc1772_fdc_int_done true - resettingn"));
- fdc1772_fdc_int_done = 0;
- };
- };
- outb(val, (reg / 2) + FDC1772BASE);
- };
- #define FD1772_MAX_SECTORS 22
- unsigned char *DMABuffer; /* buffer for writes */
- /*static unsigned long PhysDMABuffer; *//* physical address */
- /* DAG: On Arc we just go straight for the DMA buffer */
- #define PhysDMABuffer DMABuffer
- #ifdef TRACKBUFFER
- unsigned char *TrackBuffer; /* buffer for reads */
- #define PhysTrackBuffer TrackBuffer /* 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))
- #endif
- /*
- * 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;
- /* Synchronization of FDC1772 access. */
- static volatile int fdc_busy = 0;
- static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
- /* long req'd for set_bit --RR */
- static unsigned long changed_floppies = 0xff, fake_change = 0;
- #define CHECK_CHANGE_DELAY HZ/2
- /* DAG - increased to 30*HZ - not sure if this is the correct thing to do */
- #define FD_MOTOR_OFF_DELAY (10*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. */
- #define START_MOTOR_OFF_TIMER(delay)
- do {
- motor_off_timer.expires = jiffies + (delay);
- add_timer( &motor_off_timer );
- MotorOffTrys = 0;
- } while(0)
- #define START_CHECK_CHANGE_TIMER(delay)
- do {
- mod_timer(&fd_timer, jiffies + (delay));
- } while(0)
- #define START_TIMEOUT()
- do {
- mod_timer(&timeout_timer, jiffies+FLOPPY_TIMEOUT);
- } while(0)
- #define STOP_TIMEOUT()
- do {
- del_timer( &timeout_timer );
- } while(0)
- #define ENABLE_IRQ() enable_irq(FIQ_FD1772+64);
- #define DISABLE_IRQ() disable_irq(FIQ_FD1772+64);
- static void fd1772_checkint(void);
- struct tq_struct fd1772_tq =
- { 0,0, (void *)fd1772_checkint, 0 };
- /*
- * 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 necesary to make the WP
- * status bit accessible.
- */
- static int NeedSeek = 0;
- /***************************** 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 __inline__ void set_head_settle_flag(void);
- static __inline__ int get_head_settle_flag(void);
- static void floppy_irqconsequencehandler(void);
- static void fd_error(void);
- 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);
- #ifdef TRACKBUFFER
- static void fd_readtrack_check( unsigned long dummy );
- #endif
- static void fd_rwsec_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 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,
- };
- #ifdef TRACKBUFFER
- static struct timer_list readtrack_timer = {
- function: fd_readtrack_check,
- };
- #endif
- static struct timer_list timeout_timer = {
- function: fd_times_out,
- };
- static struct timer_list fd_timer = {
- function: check_change,
- };
- /* DAG: Haven't got a clue what this is? */
- int stdma_islocked(void)
- {
- return 0;
- };
- /* Select the side to use. */
- static void fd_select_side(int side)
- {
- oldlatch_aupdate(LATCHA_SIDESEL, side ? 0 : LATCHA_SIDESEL);
- }
- /* Select a drive, update the FDC1772's track register
- */
- static void fd_select_drive(int drive)
- {
- #ifdef DEBUG
- printk("fd_select_drive:%dn", drive);
- #endif
- /* Hmm - nowhere do we seem to turn the motor on - I'm going to do it here! */
- oldlatch_aupdate(LATCHA_MOTOR | LATCHA_INUSE, 0);
- if (drive == SelectedDrive)
- return;
- oldlatch_aupdate(LATCHA_FDSELALL, 0xf - (1 << drive));
- /* restore track register to saved value */
- FDC1772_WRITE(FDC1772REG_TRACK, unit[drive].track);
- udelay(25);
- SelectedDrive = drive;
- }
- /* Deselect both drives. */
- static void fd_deselect(void)
- {
- unsigned long flags;
- DPRINT(("fd_deselectn"));
- oldlatch_aupdate(LATCHA_FDSELALL | LATCHA_MOTOR | LATCHA_INUSE, 0xf | LATCHA_MOTOR | LATCHA_INUSE);
- SelectedDrive = -1;
- }
- /* This timer function deselects the drives when the FDC1772 switched the
- * motor off. The deselection cannot happen earlier because the FDC1772
- * counts the index signals, which arrive only if one drive is selected.
- */
- static void fd_motor_off_timer(unsigned long dummy)
- {
- unsigned long flags;
- unsigned char status;
- int delay;
- del_timer(&motor_off_timer);
- if (SelectedDrive < 0)
- /* no drive selected, needn't deselect anyone */
- return;
- save_flags(flags);
- cli();
- if (fdc_busy) /* was stdma_islocked */
- goto retry;
- status = FDC1772_READ(FDC1772REG_STATUS);
- if (!(status & 0x80)) {
- /*
- * motor already turned off by FDC1772 -> deselect drives
- * In actual fact its this deselection which turns the motor
- * off on the Arc, since the motor control is actually on
- * Latch A
- */
- DPRINT(("fdc1772: deselecting in fd_motor_off_timern"));
- fd_deselect();
- MotorOn = 0;
- restore_flags(flags);
- return;
- }
- /* not yet off, try again */
- retry:
- restore_flags(flags);
- /* Test again later; if tested too often, it seems there is no disk
- * in the drive and the FDC1772 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...
- */
- delay = (MotorOffTrys < FD_MOTOR_OFF_MAXTRY) ?
- (++MotorOffTrys, HZ / 20) : HZ / 2;
- START_MOTOR_OFF_TIMER(delay);
- }
- /* 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;
- int stat;
- if (fdc_busy)
- return; /* Don't start poking about if the fdc is busy */
- return; /* let's just forget it for the mo DAG */
- if (++drive > 1 || !unit[drive].connected)
- drive = 0;
- save_flags(flags);
- cli();
- if (!stdma_islocked()) {
- stat = !!(FDC1772_READ(FDC1772REG_STATUS) & FDC1772STAT_WPROT);
- /* The idea here is that if the write protect line has changed then
- the disc must have changed */
- if (stat != unit[drive].wpstat) {
- DPRINT(("wpstat[%d] = %dn", drive, stat));
- unit[drive].wpstat = stat;
- set_bit(drive, &changed_floppies);
- }
- }
- restore_flags(flags);
- START_CHECK_CHANGE_TIMER(CHECK_CHANGE_DELAY);
- }
- /* 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 = FDC1772CMDADD_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_irqconsequencehandler(void)
- {
- unsigned char status;
- void (*handler) (int);
- fdc1772_fdc_int_done = 0;
- handler = FloppyIRQHandler;
- FloppyIRQHandler = NULL;
- if (handler) {
- nop();
- status = (unsigned char) fdc1772_comendstatus;
- DPRINT(("FDC1772 irq, status = %02x handler = %08lxn", (unsigned int) status, (unsigned long) handler));
- handler(status);
- } else {
- DPRINT(("FDC1772 irq, no handler status=%02xn", fdc1772_comendstatus));
- }
- DPRINT(("FDC1772 irq: end of floppy_irqn"));
- }
- /* Error handling: If some error happened, retry some times, then
- * recalibrate, then try again, and fail after MAX_ERRORS.
- */
- static void fd_error(void)
- {
- printk("FDC1772: fd_errorn");
- /*panic("fd1772: fd_error"); *//* DAG tmp */
- if (QUEUE_EMPTY)
- return;
- CURRENT->errors++;
- if (CURRENT->errors >= MAX_ERRORS) {
- printk("fd%d: too many errors.n", SelectedDrive);
- end_request(0);
- } else if (CURRENT->errors == RECALIBRATE_ERRORS) {
- printk("fd%d: recalibratingn", SelectedDrive);
- if (SelectedDrive != -1)
- unit[SelectedDrive].track = -1;
- }
- redo_fd_request();
- }
- #define SET_IRQ_HANDLER(proc) do { FloppyIRQHandler = (proc); } while(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_action unit[drive].track=%dn", unit[drive].track));
- #ifdef TRACKBUFFER
- 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) );
- }
- }
- #endif
- if (SelectedDrive != drive) {
- /*unit[drive].track = -1; DAG */
- fd_select_drive(drive);
- };
- if (unit[drive].track == -1)
- fd_calibrate();
- else if (unit[drive].track != ReqTrack << unit[drive].disktype->stretch)
- fd_seek();
- else
- fd_rwsec();
- }
- /* Seek to track 0 if the current track is unknown */
- static void fd_calibrate(void)
- {
- DPRINT(("fd_calibraten"));
- if (unit[SelectedDrive].track >= 0) {
- fd_calibrate_done(0);
- return;
- }
- DPRINT(("fd_calibrate (after track compare)n"));
- SET_IRQ_HANDLER(fd_calibrate_done);
- /* we can't verify, since the speed may be incorrect */
- FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_RESTORE | unit[SelectedDrive].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 (status & FDC1772STAT_RECNF) {
- printk("fd%d: restore failedn", SelectedDrive);
- fd_error();
- } else {
- unit[SelectedDrive].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)
- {
- unsigned long flags;
- DPRINT(("fd_seek() to track %d (unit[SelectedDrive].track=%d)n", ReqTrack,
- unit[SelectedDrive].track));
- if (unit[SelectedDrive].track == ReqTrack <<
- unit[SelectedDrive].disktype->stretch) {
- fd_seek_done(0);
- return;
- }
- FDC1772_WRITE(FDC1772REG_DATA, ReqTrack <<
- unit[SelectedDrive].disktype->stretch);
- udelay(25);
- save_flags(flags);
- clf();
- SET_IRQ_HANDLER(fd_seek_done);
- FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_SEEK | unit[SelectedDrive].steprate |
- /* DAG */
- (MotorOn?FDC1772CMDADD_H:0));
- restore_flags(flags);
- 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 (status & FDC1772STAT_RECNF) {
- printk("fd%d: seek error (to track %d)n",
- SelectedDrive, ReqTrack);
- /* we don't know exactly which track we are on now! */
- unit[SelectedDrive].track = -1;
- fd_error();
- } else {
- unit[SelectedDrive].track = ReqTrack <<
- unit[SelectedDrive].disktype->stretch;
- NeedSeek = 0;
- fd_rwsec();
- }
- }
- /* This does the actual reading/writing after positioning the head
- * over the correct track.
- */
- #ifdef TRACKBUFFER
- static int MultReadInProgress = 0;
- #endif
- 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) {
- /*cache_push( (unsigned long)ReqData, 512 ); */
- paddr = (unsigned long) ReqData;
- rwflag = 0x100;
- } else {
- paddr = (unsigned long) PhysDMABuffer;
- #ifdef TRACKBUFFER
- if (read_track)
- paddr = (unsigned long)PhysTrackBuffer;
- #endif
- rwflag = 0;
- }
- DPRINT(("fd_rwsec() before sidesel rwflag=%d sec=%d trk=%dn", rwflag,
- ReqSector, FDC1772_READ(FDC1772REG_TRACK)));
- fd_select_side(ReqSide);
- /*DPRINT(("fd_rwsec() before start sector n")); */
- /* Start sector of this operation */
- #ifdef TRACKBUFFER
- FDC1772_WRITE( FDC1772REG_SECTOR, !read_track ? ReqSector : 1 );
- #else
- FDC1772_WRITE( FDC1772REG_SECTOR, ReqSector );
- #endif
- /* Cheat for track if stretch != 0 */
- if (unit[SelectedDrive].disktype->stretch) {
- track = FDC1772_READ(FDC1772REG_TRACK);
- FDC1772_WRITE(FDC1772REG_TRACK, track >>
- unit[SelectedDrive].disktype->stretch);
- }
- udelay(25);
- DPRINT(("fd_rwsec() before setup DMA n"));
- /* Setup DMA - Heavily modified by DAG */
- save_flags(flags);
- clf();
- disable_dma(FLOPPY_DMA);
- set_dma_mode(FLOPPY_DMA, rwflag ? DMA_MODE_WRITE : DMA_MODE_READ);
- set_dma_addr(FLOPPY_DMA, (long) paddr); /* DAG - changed from Atari specific */
- #ifdef TRACKBUFFER
- set_dma_count(FLOPPY_DMA,(!read_track ? 1 : unit[SelectedDrive].disktype->spt)*512);
- #else
- set_dma_count(FLOPPY_DMA, 512); /* Block/sector size - going to have to change */
- #endif
- SET_IRQ_HANDLER(fd_rwsec_done);
- /* Turn on dma int */
- enable_dma(FLOPPY_DMA);
- /* Now give it something to do */
- FDC1772_WRITE(FDC1772REG_CMD, (rwflag ? (FDC1772CMD_WRSEC | FDC1772CMDADD_P) :
- #ifdef TRACKBUFFER
- (FDC1772CMD_RDSEC | (read_track ? FDC1772CMDADD_M : 0) |
- /* Hmm - the idea here is to stop the FDC spinning the disc
- up when we know that we already still have it spinning */
- (MotorOn?FDC1772CMDADD_H:0))
- #else
- FDC1772CMD_RDSEC
- #endif
- ));
- restore_flags(flags);
- DPRINT(("fd_rwsec() after DMA setup flags=0x%08xn", flags));
- /*sti(); *//* DAG - Hmm */
- /* Hmm - should do something DAG */
- old_motoron = MotorOn;
- MotorOn = 1;
- NeedSeek = 1;
- /* wait for interrupt */
- #ifdef TRACKBUFFER
- 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-existant sector and need 1 sec to
- * recognise that it isn't present :-(
- */
- /* 1 rot. + 5 rot.s if motor was off */
- mod_timer(&readtrack_timer, jiffies + HZ/5 + (old_motoron ? 0 : HZ));
- DPRINT(("Setting readtrack_timer to %d @ %dn",
- readtrack_timer.expires,jiffies));
- MultReadInProgress = 1;
- }
- #endif
- /*DPRINT(("fd_rwsec() before START_TIMEOUT n")); */
- START_TIMEOUT();
- /*DPRINT(("fd_rwsec() after START_TIMEOUT n")); */
- }
- #ifdef TRACKBUFFER
- static void fd_readtrack_check(unsigned long dummy)
- {
- unsigned long flags, addr;
- extern unsigned char *fdc1772_dataaddr;
- DPRINT(("fd_readtrack_check @ %dn",jiffies));
- save_flags(flags);
- clf();
- del_timer( &readtrack_timer );
- 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 control flow
- * gets here.
- */
- restore_flags(flags);
- return;
- }
- /* get the current DMA address */
- addr=(unsigned long)fdc1772_dataaddr; /* DAG - ? */
- DPRINT(("fd_readtrack_check: addr=%x PhysTrackBuffer=%xn",addr,PhysTrackBuffer));
- if (addr >= (unsigned int)PhysTrackBuffer + unit[SelectedDrive].disktype->spt*512) {
- /* already read enough data, force an FDC interrupt to stop
- * the read operation
- */
- SET_IRQ_HANDLER( NULL );
- restore_flags(flags);
- DPRINT(("fd_readtrack_check(): donen"));
- FDC1772_WRITE( FDC1772REG_CMD, FDC1772CMD_FORCI );
- udelay(25);
- /* No error until now -- the FDC would have interrupted
- * otherwise!
- */
- fd_rwsec_done( 0 );
- } else {
- /* not yet finished, wait another tenth rotation */
- restore_flags(flags);
- DPRINT(("fd_readtrack_check(): not yet finishedn"));
- readtrack_timer.expires = jiffies + HZ/5/10;
- add_timer( &readtrack_timer );
- }
- }
- #endif
- static void fd_rwsec_done(int status)
- {
- unsigned int track;
- DPRINT(("fd_rwsec_done() status=%d @ %dn", status,jiffies));
- #ifdef TRACKBUFFER
- if (read_track && !MultReadInProgress)
- return;
- MultReadInProgress = 0;
- STOP_TIMEOUT();
- if (read_track)
- del_timer( &readtrack_timer );
- #endif
- /* Correct the track if stretch != 0 */
- if (unit[SelectedDrive].disktype->stretch) {
- track = FDC1772_READ(FDC1772REG_TRACK);
- FDC1772_WRITE(FDC1772REG_TRACK, track <<
- unit[SelectedDrive].disktype->stretch);
- }
- if (ReqCmd == WRITE && (status & FDC1772STAT_WPROT)) {
- printk("fd%d: is write protectedn", SelectedDrive);
- goto err_end;
- }
- if ((status & FDC1772STAT_RECNF)
- #ifdef TRACKBUFFER
- /* RECNF is no error after a multiple read when the FDC
- * searched for a non-existant sector!
- */
- && !(read_track &&
- FDC1772_READ(FDC1772REG_SECTOR) > unit[SelectedDrive].disktype->spt)
- #endif
- ) {
- if (Probing) {
- if (unit[SelectedDrive].disktype > disk_type) {
- /* try another disk type */
- unit[SelectedDrive].disktype--;
- floppy_sizes[SelectedDrive]
- = unit[SelectedDrive].disktype->blocks >> 1;
- } else
- Probing = 0;
- } else {
- /* record not found, but not probing. Maybe stretch wrong ? Restart probing */
- if (unit[SelectedDrive].autoprobe) {
- unit[SelectedDrive].disktype = disk_type + NUM_DISK_TYPES - 1;
- floppy_sizes[SelectedDrive]
- = unit[SelectedDrive].disktype->blocks >> 1;
- Probing = 1;
- }
- }
- if (Probing) {
- setup_req_params(SelectedDrive);
- #ifdef TRACKBUFFER
- BufferDrive = -1;
- #endif
- do_fd_action(SelectedDrive);
- return;
- }
- printk("fd%d: sector %d not found (side %d, track %d)n",
- SelectedDrive, FDC1772_READ(FDC1772REG_SECTOR), ReqSide, ReqTrack);
- goto err_end;
- }
- if (status & FDC1772STAT_CRC) {
- printk("fd%d: CRC error (side %d, track %d, sector %d)n",
- SelectedDrive, ReqSide, ReqTrack, FDC1772_READ(FDC1772REG_SECTOR));
- goto err_end;
- }
- if (status & FDC1772STAT_LOST) {
- printk("fd%d: lost data (side %d, track %d, sector %d)n",
- SelectedDrive, ReqSide, ReqTrack, FDC1772_READ(FDC1772REG_SECTOR));
- goto err_end;
- }
- Probing = 0;
- if (ReqCmd == READ) {
- #ifdef TRACKBUFFER
- if (!read_track) {
- /*cache_clear (PhysDMABuffer, 512);*/
- copy_buffer (DMABuffer, ReqData);
- } else {
- /*cache_clear (PhysTrackBuffer, FD1772_MAX_SECTORS * 512);*/
- BufferDrive = SelectedDrive;
- BufferSide = ReqSide;
- BufferTrack = ReqTrack;
- copy_buffer (SECTOR_BUFFER (ReqSector), ReqData);
- }
- #else
- /*cache_clear( PhysDMABuffer, 512 ); */
- copy_buffer(DMABuffer, ReqData);
- #endif
- }
- 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:
- #ifdef TRACKBUFFER
- BufferDrive = -1;
- #endif
- fd_error();
- }
- static void fd_times_out(unsigned long dummy)
- {
- 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 */
- del_timer( &readtrack_timer );
- FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_FORCI);
- udelay(25);
- printk("floppy timeoutn");
- STOP_TIMEOUT(); /* hmm - should we do this ? */
- fd_error();
- }
- /* The (noop) seek operation here is needed to make the WP bit in the
- * FDC1772 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)
- {
- /* DAG - just try without this dummy seek! */
- finish_fdc_done(0);
- return;
- if (!NeedSeek) {
- finish_fdc_done(0);
- } else {
- DPRINT(("finish_fdc: dummy seek startedn"));
- FDC1772_WRITE(FDC1772REG_DATA, unit[SelectedDrive].track);
- SET_IRQ_HANDLER(finish_fdc_done);
- FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_SEEK);
- MotorOn = 1;
- START_TIMEOUT();
- /* we must wait for the IRQ here, because the ST-DMA is
- * released immediatly 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_after(jiffies + 5, fd_timer.expires))
- /* 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( CHECK_CHANGE_DELAY ); */
- };
- del_timer(&motor_off_timer);
- START_MOTOR_OFF_TIMER(FD_MOTOR_OFF_DELAY);
- save_flags(flags);
- cli();
- /* stdma_release(); - not sure if I should do something DAG */
- fdc_busy = 0;
- wake_up(&fdc_wait);
- restore_flags(flags);
- DPRINT(("finish_fdc() finishedn"));
- }
- /* Prevent "aliased" accesses. */
- static int fd_ref[4];
- static int fd_device[4];
- /*
- * 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)
- {
- }
- /* On the old arcs write protect depends on the particular model
- of machine. On the A310, R140, and A440 there is a disc changed
- detect, however on the A4x0/1 range there is not. There
- is nothing to tell you which machine your on.
- At the moment I'm just marking changed always. I've
- left the Atari's 'change on write protect change' code in this
- part (but nothing sets it).
- RiscOS apparently checks the disc serial number etc. to detect changes
- - but if it sees a disc change line go high (?) it flips to using
- it. Well maybe I'll add that in the future (!?)
- */
- static int check_floppy_change(dev_t dev)
- {
- unsigned int drive = (dev & 0x03);
- if (MAJOR(dev) != MAJOR_NR) {
- printk("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 (unit[drive].wpstat) {
- /* WP is on -> could be changed: to be sure, buffers should be
- * invalidated...
- */
- return 1;
- }
- return 1; /* DAG - was 0 */
- }
- static int floppy_revalidate(dev_t dev)
- {
- int drive = dev & 3;
- if (test_bit(drive, &changed_floppies) || test_bit(drive, &fake_change)
- || unit[drive].disktype == 0) {
- #ifdef TRACKBUFFER
- BufferDrive = -1;
- #endif
- clear_bit(drive, &fake_change);
- clear_bit(drive, &changed_floppies);
- unit[drive].disktype = 0;
- }
- 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 / unit[drive].disktype->spt;
- ReqSector = block - ReqTrack * unit[drive].disktype->spt + 1;
- ReqSide = ReqTrack & 1;
- ReqTrack >>= 1;
- ReqData = ReqBuffer + 512 * ReqCnt;
- #ifdef TRACKBUFFER
- read_track = (ReqCmd == READ && CURRENT_ERRORS == 0);
- #endif
- 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;
- struct archy_floppy_struct *floppy;
- DPRINT(("redo_fd_request: CURRENT=%08lx CURRENT->rq_dev=%04x CURRENT->sector=%ldn",
- (unsigned long) CURRENT, CURRENT ? CURRENT->rq_dev : 0,
- !QUEUE_EMPTY ? CURRENT->sector : 0));
- if (!QUEUE_EMPTY && CURRENT->rq_status == RQ_INACTIVE)
- goto the_end;
- repeat:
- if (QUEUE_EMPTY)
- goto the_end;
- if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
- panic(DEVICE_NAME ": request list destroyed");
- if (CURRENT->bh) {
- if (!buffer_locked(CURRENT->bh))
- panic(DEVICE_NAME ": block not locked");
- }
- device = MINOR(CURRENT_DEVICE);
- drive = device & 3;
- type = device >> 2;
- floppy = &unit[drive];
- if (!floppy->connected) {
- /* drive not connected */
- printk("Unknown Device: fd%dn", drive);
- end_request(0);
- goto repeat;
- }
- if (type == 0) {
- if (!floppy->disktype) {
- Probing = 1;
- floppy->disktype = disk_type + NUM_DISK_TYPES - 1;
- floppy_sizes[drive] = floppy->disktype->blocks >> 1;
- floppy->autoprobe = 1;
- }
- } else {
- /* user supplied disk type */
- --type;
- if (type >= NUM_DISK_TYPES) {
- printk("fd%d: invalid disk format", drive);
- end_request(0);
- goto repeat;
- }
- floppy->disktype = &disk_type[type];
- floppy_sizes[drive] = disk_type[type].blocks >> 1;
- floppy->autoprobe = 0;
- }
- if (CURRENT->sector + 1 > floppy->disktype->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();
- }
- static void fd1772_checkint(void)
- {
- extern int fdc1772_bytestogo;
- /*printk("fd1772_checkint %dn",fdc1772_fdc_int_done);*/
- if (fdc1772_fdc_int_done)
- floppy_irqconsequencehandler();
- if ((MultReadInProgress) && (fdc1772_bytestogo==0)) fd_readtrack_check(0);
- if (fdc_busy) {
- queue_task(&fd1772_tq,&tq_immediate);
- mark_bh(IMMEDIATE_BH);
- }
- }
- void do_fd_request(request_queue_t* q)
- {
- unsigned long flags;
- DPRINT(("do_fd_request for pid %dn", current->pid));
- if (fdc_busy) return;
- save_flags(flags);
- cli();
- while (fdc_busy)
- sleep_on(&fdc_wait);
- fdc_busy = 1;
- ENABLE_IRQ();
- restore_flags(flags);
- fdc1772_fdc_int_done = 0;
- redo_fd_request();
- queue_task(&fd1772_tq,&tq_immediate);
- mark_bh(IMMEDIATE_BH);
- }
- static int invalidate_drive(int rdev)
- {
- /* invalidate the buffer track to force a reread */
- #ifdef TRACKBUFFER
- BufferDrive = -1;
- #endif
- set_bit(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, device;
- device = inode->i_rdev;
- drive = MINOR(device);
- switch (cmd) {
- case FDFMTBEG:
- return 0;
- /* case FDC1772LRPRM: ??? DAG what does this do??
- unit[drive].disktype = NULL;
- floppy_sizes[drive] = MAX_DISK_SIZE;
- return invalidate_drive (device); */
- case FDFMTEND:
- case FDFLUSH:
- return invalidate_drive(drive);
- }
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
- if (drive < 0 || drive > 3)
- return -EINVAL;
- switch (cmd) {
- default:
- return -EINVAL;
- }
- return 0;
- }
- /* Initialize the 'unit' variable for drive 'drive' */
- static void fd_probe(int drive)
- {
- unit[drive].connected = 0;
- unit[drive].disktype = NULL;
- if (!fd_test_drive_present(drive))
- return;
- unit[drive].connected = 1;
- unit[drive].track = -1; /* If we put the auto detect back in this can go to 0 */
- unit[drive].steprate = FDC1772STEP_6;
- 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 fd_test_drive_present(int drive)
- {
- unsigned long timeout;
- unsigned char status;
- int ok;
- printk("fd_test_drive_present %dn", drive);
- if (drive > 1)
- return (0);
- return (1); /* Simple hack for the moment - the autodetect doesn't seem to work on arc */
- fd_select_drive(drive);
- /* disable interrupt temporarily */
- DISABLE_IRQ();
- FDC1772_WRITE(FDC1772REG_TRACK, 0x00); /* was ff00 why? */
- FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_RESTORE | FDC1772CMDADD_H | FDC1772STEP_6);
- /*printk("fd_test_drive_present: Going into timeout loopn"); */
- for (ok = 0, timeout = jiffies + 2 * HZ + HZ / 2; time_before(jiffies, timeout);) {
- /* What does this piece of atariism do? - query for an interrupt? */
- /* if (!(mfp.par_dt_reg & 0x20))
- break; */
- /* Well this is my nearest guess - quit when we get an FDC interrupt */
- if (ioc_readb(IOC_FIQSTAT) & 2)
- break;
- }
- /*printk("fd_test_drive_present: Coming out of timeout loopn"); */
- status = FDC1772_READ(FDC1772REG_STATUS);
- ok = (status & FDC1772STAT_TR00) != 0;
- /*printk("fd_test_drive_present: ok=%dn",ok); */
- /* force interrupt to abort restore operation (FDC1772 would try
- * about 50 seconds!) */
- FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_FORCI);
- udelay(500);
- status = FDC1772_READ(FDC1772REG_STATUS);
- udelay(20);
- /*printk("fd_test_drive_present: just before OK code %dn",ok); */
- if (ok) {
- /* dummy seek command to make WP bit accessible */
- FDC1772_WRITE(FDC1772REG_DATA, 0);
- FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_SEEK);
- printk("fd_test_drive_present: just before wait for intn");
- /* DAG: Guess means wait for interrupt */
- while (!(ioc_readb(IOC_FIQSTAT) & 2));
- printk("fd_test_drive_present: just after wait for intn");
- status = FDC1772_READ(FDC1772REG_STATUS);
- }
- printk("fd_test_drive_present: just before ENABLE_IRQn");
- ENABLE_IRQ();
- printk("fd_test_drive_present: about to returnn");
- 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 config_types(void)
- {
- int drive, cnt = 0;
- printk("Probing floppy drive(s):n");
- for (drive = 0; drive < FD_MAX_UNITS; drive++) {
- fd_probe(drive);
- if (unit[drive].connected) {
- printk("fd%dn", drive);
- ++cnt;
- }
- }
- if (FDC1772_READ(FDC1772REG_STATUS) & FDC1772STAT_BUSY) {
- /* If FDC1772 is still busy from probing, give it another FORCI
- * command to abort the operation. If this isn't done, the FDC1772
- * 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 :-(
- */
- FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_FORCI);
- udelay(500);
- FDC1772_READ(FDC1772REG_STATUS);
- udelay(20);
- }
- if (cnt > 0) {
- START_MOTOR_OFF_TIMER(FD_MOTOR_OFF_DELAY);
- if (cnt == 1)
- fd_select_drive(0);
- /*START_CHECK_CHANGE_TIMER( CHECK_CHANGE_DELAY ); */
- }
- }
- /*
- * 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;
- int old_dev;
- if (!filp) {
- DPRINT(("Weird, open called with filp=0n"));
- return -EIO;
- }
- drive = MINOR(inode->i_rdev) & 3;
- if ((MINOR(inode->i_rdev) >> 2) > NUM_DISK_TYPES)
- return -ENXIO;
- old_dev = fd_device[drive];
- if (fd_ref[drive])
- if (old_dev != 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] = inode->i_rdev;
- if (old_dev && old_dev != inode->i_rdev)
- invalidate_buffers(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 (unit[drive].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("floppy_release with fd_ref == 0");
- fd_ref[drive] = 0;
- }
- return 0;
- }
- static struct block_device_operations floppy_fops =
- {
- open: floppy_open,
- release: floppy_release,
- ioctl: fd_ioctl,
- check_media_change: check_floppy_change,
- revalidate: floppy_revalidate,
- };
- int fd1772_init(void)
- {
- int err;
- int i;
- if (!machine_is_archimedes())
- return 0;
- if (register_blkdev(MAJOR_NR, "fd", &floppy_fops)) {
- printk("Unable to get major %d for floppyn", MAJOR_NR);
- return 1;
- }
- if (request_dma(FLOPPY_DMA, "fd1772")) {
- printk("Unable to grab DMA%d for the floppy (1772) drivern", FLOPPY_DMA);
- return 1;
- };
- if (request_dma(FIQ_FD1772, "fd1772 end")) {
- printk("Unable to grab DMA%d for the floppy (1772) drivern", FIQ_FD1772);
- err = 1; /* XXX */
- goto cleanup_dma;
- };
- /* initialize variables */
- err = -ENOMEM;
- SelectedDrive = -1;
- #ifdef TRACKBUFFER
- BufferDrive = BufferSide = BufferTrack = -1;
- /* Atari uses 512 - I want to eventually cope with 1K sectors */
- DMABuffer = (char *)kmalloc((FD1772_MAX_SECTORS+1)*512,GFP_KERNEL);
- if (DMABuffer == NULL)
- goto cleanup_dma;
- TrackBuffer = DMABuffer + 512;
- #else
- /* Allocate memory for the DMAbuffer - on the Atari this takes it
- out of some special memory... */
- DMABuffer = (char *) kmalloc(2048); /* Copes with pretty large sectors */
- if (DMABuffer == NULL)
- goto cleanup_dma;
- #endif
- enable_dma(FIQ_FD1772); /* This inserts a call to our command end routine */
- for (i = 0; i < FD_MAX_UNITS; i++) {
- unit[i].track = -1;
- }
- for (i = 0; i < 256; i++)
- if ((i >> 2) > 0 && (i >> 2) <= NUM_DISK_TYPES)
- floppy_sizes[i] = disk_type[(i >> 2) - 1].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);
- config_types();
- return 0;
- cleanup_dma:
- free_dma(FLOPPY_DMA);
- return err;
- }