| /* |
| * 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 sequence' |
| * 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/workqueue.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 <linux/bitops.h> |
| |
| #include <asm/arch/oldlatches.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> |
| |
| |
| /* 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 |
| |
| static struct request_queue *floppy_queue; |
| |
| #define MAJOR_NR FLOPPY_MAJOR |
| #define FLOPPY_DMA 0 |
| #define DEVICE_NAME "floppy" |
| #define QUEUE (floppy_queue) |
| #define CURRENT elv_next_request(floppy_queue) |
| |
| /* 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 struct gendisk *disks[FD_MAX_UNIT]; |
| |
| /* 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 @ %d\n", val,jiffies)); |
| if (fdc1772_fdc_int_done) { |
| DPRINT(("FDC1772_WRITE: Hmm fdc1772_fdc_int_done true - resetting\n")); |
| 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); |
| |
| DECLARE_WORK(fd1772_tq, (void *)fd1772_checkint, NULL); |
| /* |
| * 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; |
| |
| |
| /***************************** 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 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 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); |
| static void do_fd_request(request_queue_t *); |
| |
| /************************* End of Prototypes **************************/ |
| |
| static struct timer_list motor_off_timer = |
| TIMER_INITIALIZER(fd_motor_off_timer, 0, 0); |
| |
| #ifdef TRACKBUFFER |
| static struct timer_list readtrack_timer = |
| TIMER_INITIALIZER(fd_readtrack_check, 0, 0); |
| #endif |
| |
| static struct timer_list timeout_timer = |
| TIMER_INITIALIZER(fd_times_out, 0, 0); |
| |
| static struct timer_list fd_timer = |
| TIMER_INITIALIZER(check_change, 0, 0); |
| |
| /* 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:%d\n", 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_deselect\n")); |
| |
| 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_timer\n")); |
| 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] = %d\n", 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 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++; |
| } |
| |
| 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 = %08lx\n", (unsigned int) status, (unsigned long) handler)); |
| handler(status); |
| } else { |
| DPRINT(("FDC1772 irq, no handler status=%02x\n", fdc1772_comendstatus)); |
| } |
| DPRINT(("FDC1772 irq: end of floppy_irq\n")); |
| } |
| |
| |
| /* 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_error\n"); |
| /*panic("fd1772: fd_error"); *//* DAG tmp */ |
| if (!CURRENT) |
| return; |
| CURRENT->errors++; |
| if (CURRENT->errors >= MAX_ERRORS) { |
| printk("fd%d: too many errors.\n", SelectedDrive); |
| end_request(CURRENT, 0); |
| } else if (CURRENT->errors == RECALIBRATE_ERRORS) { |
| printk("fd%d: recalibrating\n", 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) |
| { |
| struct request *req; |
| DPRINT(("do_fd_action unit[drive].track=%d\n", unit[drive].track)); |
| |
| #ifdef TRACKBUFFER |
| repeat: |
| |
| if (IS_BUFFERED( drive, ReqSide, ReqTrack )) { |
| req = CURRENT; |
| if (ReqCmd == READ) { |
| copy_buffer( SECTOR_BUFFER(ReqSector), ReqData ); |
| if (++ReqCnt < req->current_nr_sectors) { |
| /* read next sector */ |
| setup_req_params( drive ); |
| goto repeat; |
| } else { |
| /* all sectors finished */ |
| req->nr_sectors -= req->current_nr_sectors; |
| req->sector += req->current_nr_sectors; |
| end_request(req, 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_calibrate\n")); |
| 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 failed\n", 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=%c\n", 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=%d\n", 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%08x\n", 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 @ %d\n", |
| 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 @ %d\n",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=%x\n",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(): done\n")); |
| 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 finished\n")); |
| 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 @ %d\n", 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 protected\n", 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--; |
| set_capacity(disks[SelectedDrive], |
| unit[SelectedDrive].disktype->blocks); |
| } 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; |
| set_capacity(disks[SelectedDrive], |
| unit[SelectedDrive].disktype->blocks); |
| 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(CURRENT, 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 timeout\n"); |
| 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 started\n")); |
| 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 immediately afterwards and the interrupt may be |
| * delivered to the wrong driver. |
| */ |
| } |
| } |
| |
| |
| static void finish_fdc_done(int dummy) |
| { |
| unsigned long flags; |
| |
| DPRINT(("finish_fdc_done entered\n")); |
| 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() finished\n")); |
| } |
| |
| |
| /* Prevent "aliased" accesses. */ |
| static int fd_ref[4]; |
| static int fd_device[4]; |
| |
| /* 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(struct gendisk *disk) |
| { |
| struct archy_floppy_struct *p = disk->private_data; |
| unsigned int drive = p - unit; |
| |
| 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 (p->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(struct gendisk *disk) |
| { |
| struct archy_floppy_struct *p = disk->private_data; |
| unsigned int drive = p - unit; |
| |
| 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); |
| p->disktype = 0; |
| } |
| return 0; |
| } |
| |
| /* 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=%08lx\n", ReqSide, |
| ReqTrack, ReqSector, (unsigned long) ReqData)); |
| } |
| |
| |
| static void redo_fd_request(void) |
| { |
| int drive, type; |
| struct archy_floppy_struct *floppy; |
| |
| DPRINT(("redo_fd_request: CURRENT=%p dev=%s CURRENT->sector=%ld\n", |
| CURRENT, CURRENT ? CURRENT->rq_disk->disk_name : "", |
| CURRENT ? CURRENT->sector : 0)); |
| |
| repeat: |
| |
| if (!CURRENT) |
| goto the_end; |
| |
| floppy = CURRENT->rq_disk->private_data; |
| drive = floppy - unit; |
| type = fd_device[drive]; |
| |
| if (!floppy->connected) { |
| /* drive not connected */ |
| printk("Unknown Device: fd%d\n", drive); |
| end_request(CURRENT, 0); |
| goto repeat; |
| } |
| if (type == 0) { |
| if (!floppy->disktype) { |
| Probing = 1; |
| floppy->disktype = disk_type + NUM_DISK_TYPES - 1; |
| set_capacity(disks[drive], floppy->disktype->blocks); |
| floppy->autoprobe = 1; |
| } |
| } else { |
| /* user supplied disk type */ |
| --type; |
| if (type >= NUM_DISK_TYPES) { |
| printk("fd%d: invalid disk format", drive); |
| end_request(CURRENT, 0); |
| goto repeat; |
| } |
| floppy->disktype = &disk_type[type]; |
| set_capacity(disks[drive], floppy->disktype->blocks); |
| floppy->autoprobe = 0; |
| } |
| |
| if (CURRENT->sector + 1 > floppy->disktype->blocks) { |
| end_request(CURRENT, 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 %d\n",fdc1772_fdc_int_done);*/ |
| if (fdc1772_fdc_int_done) |
| floppy_irqconsequencehandler(); |
| if ((MultReadInProgress) && (fdc1772_bytestogo==0)) fd_readtrack_check(0); |
| if (fdc_busy) { |
| schedule_work(&fd1772_tq); |
| } |
| } |
| |
| static void do_fd_request(request_queue_t* q) |
| { |
| unsigned long flags; |
| |
| DPRINT(("do_fd_request for pid %d\n", 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(); |
| |
| schedule_work(&fd1772_tq); |
| } |
| |
| |
| static int invalidate_drive(struct block_device *bdev) |
| { |
| struct archy_floppy_struct *p = bdev->bd_disk->private_data; |
| /* invalidate the buffer track to force a reread */ |
| #ifdef TRACKBUFFER |
| BufferDrive = -1; |
| #endif |
| |
| set_bit(p - unit, &fake_change); |
| return 0; |
| } |
| |
| static int fd_ioctl(struct inode *inode, struct file *filp, |
| unsigned int cmd, unsigned long param) |
| { |
| struct block_device *bdev = inode->i_bdev; |
| |
| switch (cmd) { |
| case FDFMTEND: |
| case FDFLUSH: |
| invalidate_drive(bdev); |
| check_disk_change(bdev); |
| case FDFMTBEG: |
| return 0; |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| |
| /* 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 %d\n", 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 loop\n"); */ |
| 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 loop\n"); */ |
| status = FDC1772_READ(FDC1772REG_STATUS); |
| ok = (status & FDC1772STAT_TR00) != 0; |
| |
| /*printk("fd_test_drive_present: ok=%d\n",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 %d\n",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 int\n"); |
| /* DAG: Guess means wait for interrupt */ |
| while (!(ioc_readb(IOC_FIQSTAT) & 2)); |
| printk("fd_test_drive_present: just after wait for int\n"); |
| status = FDC1772_READ(FDC1772REG_STATUS); |
| } |
| printk("fd_test_drive_present: just before ENABLE_IRQ\n"); |
| ENABLE_IRQ(); |
| printk("fd_test_drive_present: about to return\n"); |
| 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%d\n", 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 = iminor(inode) & 3; |
| int type = iminor(inode) >> 2; |
| int old_dev = fd_device[drive]; |
| |
| if (fd_ref[drive] && old_dev != type) |
| 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] = type; |
| |
| if (filp->f_flags & O_NDELAY) |
| return 0; |
| |
| if (filp->f_mode & 3) { |
| check_disk_change(inode->i_bdev); |
| 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 = iminor(inode) & 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, |
| .media_changed = check_floppy_change, |
| .revalidate_disk= floppy_revalidate, |
| }; |
| |
| static struct kobject *floppy_find(dev_t dev, int *part, void *data) |
| { |
| int drive = *part & 3; |
| if ((*part >> 2) > NUM_DISK_TYPES || drive >= FD_MAX_UNITS) |
| return NULL; |
| *part = 0; |
| return get_disk(disks[drive]); |
| } |
| |
| int fd1772_init(void) |
| { |
| static DEFINE_SPINLOCK(lock); |
| int i, err = -ENOMEM; |
| |
| if (!machine_is_archimedes()) |
| return 0; |
| |
| for (i = 0; i < FD_MAX_UNITS; i++) { |
| disks[i] = alloc_disk(1); |
| if (!disks[i]) |
| goto err_disk; |
| } |
| |
| err = register_blkdev(MAJOR_NR, "fd"); |
| if (err) |
| goto err_disk; |
| |
| err = -EBUSY; |
| if (request_dma(FLOPPY_DMA, "fd1772")) { |
| printk("Unable to grab DMA%d for the floppy (1772) driver\n", FLOPPY_DMA); |
| goto err_blkdev; |
| }; |
| |
| if (request_dma(FIQ_FD1772, "fd1772 end")) { |
| printk("Unable to grab DMA%d for the floppy (1772) driver\n", FIQ_FD1772); |
| goto err_dma1; |
| }; |
| |
| /* initialize variables */ |
| 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); |
| 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 */ |
| #endif |
| err = -ENOMEM; |
| if (!DMAbuffer) |
| goto err_dma2; |
| |
| enable_dma(FIQ_FD1772); /* This inserts a call to our command end routine */ |
| |
| floppy_queue = blk_init_queue(do_fd_request, &lock); |
| if (!floppy_queue) |
| goto err_queue; |
| |
| for (i = 0; i < FD_MAX_UNITS; i++) { |
| unit[i].track = -1; |
| disks[i]->major = MAJOR_NR; |
| disks[i]->first_minor = 0; |
| disks[i]->fops = &floppy_fops; |
| sprintf(disks[i]->disk_name, "fd%d", i); |
| disks[i]->private_data = &unit[i]; |
| disks[i]->queue = floppy_queue; |
| set_capacity(disks[i], MAX_DISK_SIZE * 2); |
| } |
| blk_register_region(MKDEV(MAJOR_NR, 0), 256, THIS_MODULE, |
| floppy_find, NULL, NULL); |
| |
| for (i = 0; i < FD_MAX_UNITS; i++) |
| add_disk(disks[i]); |
| |
| config_types(); |
| |
| return 0; |
| |
| err_queue: |
| kfree(DMAbuffer); |
| err_dma2: |
| free_dma(FIQ_FD1772); |
| |
| err_dma1: |
| free_dma(FLOPPY_DMA); |
| |
| err_blkdev: |
| unregister_blkdev(MAJOR_NR, "fd"); |
| |
| err_disk: |
| while (i--) |
| put_disk(disks[i]); |
| return err; |
| } |