amiflop.c
资源名称:block.rar [点击查看]
上传用户:ajay2009
上传日期:2009-05-22
资源大小:495k
文件大小:46k
源码类别:
驱动编程
开发平台:
Unix_Linux
- /*
- * linux/amiga/amiflop.c
- *
- * Copyright (C) 1993 Greg Harp
- * Portions of this driver are based on code contributed by Brad Pepers
- *
- * revised 28.5.95 by Joerg Dorchain
- * - now no bugs(?) any more for both HD & DD
- * - added support for 40 Track 5.25" drives, 80-track hopefully behaves
- * like 3.5" dd (no way to test - are there any 5.25" drives out there
- * that work on an A4000?)
- * - wrote formatting routine (maybe dirty, but works)
- *
- * june/july 1995 added ms-dos support by Joerg Dorchain
- * (portions based on messydos.device and various contributors)
- * - currently only 9 and 18 sector disks
- *
- * - fixed a bug with the internal trackbuffer when using multiple
- * disks the same time
- * - made formatting a bit safer
- * - added command line and machine based default for "silent" df0
- *
- * december 1995 adapted for 1.2.13pl4 by Joerg Dorchain
- * - works but I think it's inefficient. (look in redo_fd_request)
- * But the changes were very efficient. (only three and a half lines)
- *
- * january 1996 added special ioctl for tracking down read/write problems
- * - usage ioctl(d, RAW_TRACK, ptr); the raw track buffer (MFM-encoded data
- * is copied to area. (area should be large enough since no checking is
- * done - 30K is currently sufficient). return the actual size of the
- * trackbuffer
- * - replaced udelays() by a timer (CIAA timer B) for the waits
- * needed for the disk mechanic.
- *
- * february 1996 fixed error recovery and multiple disk access
- * - both got broken the first time I tampered with the driver :-(
- * - still not safe, but better than before
- *
- * revised Marts 3rd, 1996 by Jes Sorensen for use in the 1.3.28 kernel.
- * - Minor changes to accept the kdev_t.
- * - Replaced some more udelays with ms_delays. Udelay is just a loop,
- * and so the delay will be different depending on the given
- * processor :-(
- * - The driver could use a major cleanup because of the new
- * major/minor handling that came with kdev_t. It seems to work for
- * the time being, but I can't guarantee that it will stay like
- * that when we start using 16 (24?) bit minors.
- *
- * restructured jan 1997 by Joerg Dorchain
- * - Fixed Bug accessing multiple disks
- * - some code cleanup
- * - added trackbuffer for each drive to speed things up
- * - fixed some race conditions (who finds the next may send it to me ;-)
- */
- #include <linux/module.h>
- #include <linux/fd.h>
- #include <linux/hdreg.h>
- #include <linux/delay.h>
- #include <linux/init.h>
- #include <linux/amifdreg.h>
- #include <linux/amifd.h>
- #include <linux/buffer_head.h>
- #include <linux/blkdev.h>
- #include <linux/elevator.h>
- #include <asm/setup.h>
- #include <asm/uaccess.h>
- #include <asm/amigahw.h>
- #include <asm/amigaints.h>
- #include <asm/irq.h>
- #undef DEBUG /* print _LOTS_ of infos */
- #define RAW_IOCTL
- #ifdef RAW_IOCTL
- #define IOCTL_RAW_TRACK 0x5254524B /* 'RTRK' */
- #endif
- /*
- * Defines
- */
- /*
- * Error codes
- */
- #define FD_OK 0 /* operation succeeded */
- #define FD_ERROR -1 /* general error (seek, read, write, etc) */
- #define FD_NOUNIT 1 /* unit does not exist */
- #define FD_UNITBUSY 2 /* unit already active */
- #define FD_NOTACTIVE 3 /* unit is not active */
- #define FD_NOTREADY 4 /* unit is not ready (motor not on/no disk) */
- #define MFM_NOSYNC 1
- #define MFM_HEADER 2
- #define MFM_DATA 3
- #define MFM_TRACK 4
- /*
- * Floppy ID values
- */
- #define FD_NODRIVE 0x00000000 /* response when no unit is present */
- #define FD_DD_3 0xffffffff /* double-density 3.5" (880K) drive */
- #define FD_HD_3 0x55555555 /* high-density 3.5" (1760K) drive */
- #define FD_DD_5 0xaaaaaaaa /* double-density 5.25" (440K) drive */
- static unsigned long int fd_def_df0 = FD_DD_3; /* default for df0 if it doesn't identify */
- module_param(fd_def_df0, ulong, 0);
- MODULE_LICENSE("GPL");
- static struct request_queue *floppy_queue;
- #define QUEUE (floppy_queue)
- #define CURRENT elv_next_request(floppy_queue)
- /*
- * Macros
- */
- #define MOTOR_ON (ciab.prb &= ~DSKMOTOR)
- #define MOTOR_OFF (ciab.prb |= DSKMOTOR)
- #define SELECT(mask) (ciab.prb &= ~mask)
- #define DESELECT(mask) (ciab.prb |= mask)
- #define SELMASK(drive) (1 << (3 + (drive & 3)))
- static struct fd_drive_type drive_types[] = {
- /* code name tr he rdsz wrsz sm pc1 pc2 sd st st*/
- /* warning: times are now in milliseconds (ms) */
- { FD_DD_3, "DD 3.5", 80, 2, 14716, 13630, 1, 80,161, 3, 18, 1},
- { FD_HD_3, "HD 3.5", 80, 2, 28344, 27258, 2, 80,161, 3, 18, 1},
- { FD_DD_5, "DD 5.25", 40, 2, 14716, 13630, 1, 40, 81, 6, 30, 2},
- { FD_NODRIVE, "No Drive", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
- };
- static int num_dr_types = sizeof(drive_types) / sizeof(drive_types[0]);
- static int amiga_read(int), dos_read(int);
- static void amiga_write(int), dos_write(int);
- static struct fd_data_type data_types[] = {
- { "Amiga", 11 , amiga_read, amiga_write},
- { "MS-Dos", 9, dos_read, dos_write}
- };
- /* current info on each unit */
- static struct amiga_floppy_struct unit[FD_MAX_UNITS];
- static struct timer_list flush_track_timer[FD_MAX_UNITS];
- static struct timer_list post_write_timer;
- static struct timer_list motor_on_timer;
- static struct timer_list motor_off_timer[FD_MAX_UNITS];
- static int on_attempts;
- /* Synchronization of FDC access */
- /* request loop (trackbuffer) */
- static volatile int fdc_busy = -1;
- static volatile int fdc_nested;
- static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
- static DECLARE_WAIT_QUEUE_HEAD(motor_wait);
- static volatile int selected = -1; /* currently selected drive */
- static int writepending;
- static int writefromint;
- static char *raw_buf;
- static DEFINE_SPINLOCK(amiflop_lock);
- #define RAW_BUF_SIZE 30000 /* size of raw disk data */
- /*
- * 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 volatile char block_flag;
- static DECLARE_WAIT_QUEUE_HEAD(wait_fd_block);
- /* MS-Dos MFM Coding tables (should go quick and easy) */
- static unsigned char mfmencode[16]={
- 0x2a, 0x29, 0x24, 0x25, 0x12, 0x11, 0x14, 0x15,
- 0x4a, 0x49, 0x44, 0x45, 0x52, 0x51, 0x54, 0x55
- };
- static unsigned char mfmdecode[128];
- /* floppy internal millisecond timer stuff */
- static volatile int ms_busy = -1;
- static DECLARE_WAIT_QUEUE_HEAD(ms_wait);
- #define MS_TICKS ((amiga_eclock+50)/1000)
- /*
- * Note that MAX_ERRORS=X doesn't imply that we retry every bad read
- * max X times - some types of errors increase the errorcount by 2 or
- * even 3, so we might actually retry only X/2 times before giving up.
- */
- #define MAX_ERRORS 12
- /* Prevent "aliased" accesses. */
- static int fd_ref[4] = { 0,0,0,0 };
- static int fd_device[4] = { 0, 0, 0, 0 };
- /*
- * Here come the actual hardware access and helper functions.
- * They are not reentrant and single threaded because all drives
- * share the same hardware and the same trackbuffer.
- */
- /* Milliseconds timer */
- static irqreturn_t ms_isr(int irq, void *dummy, struct pt_regs *fp)
- {
- ms_busy = -1;
- wake_up(&ms_wait);
- return IRQ_HANDLED;
- }
- /* all waits are queued up
- A more generic routine would do a schedule a la timer.device */
- static void ms_delay(int ms)
- {
- unsigned long flags;
- int ticks;
- if (ms > 0) {
- local_irq_save(flags);
- while (ms_busy == 0)
- sleep_on(&ms_wait);
- ms_busy = 0;
- local_irq_restore(flags);
- ticks = MS_TICKS*ms-1;
- ciaa.tblo=ticks%256;
- ciaa.tbhi=ticks/256;
- ciaa.crb=0x19; /*count eclock, force load, one-shoot, start */
- sleep_on(&ms_wait);
- }
- }
- /* Hardware semaphore */
- /* returns true when we would get the semaphore */
- static inline int try_fdc(int drive)
- {
- drive &= 3;
- return ((fdc_busy < 0) || (fdc_busy == drive));
- }
- static void get_fdc(int drive)
- {
- unsigned long flags;
- drive &= 3;
- #ifdef DEBUG
- printk("get_fdc: drive %d fdc_busy %d fdc_nested %dn",drive,fdc_busy,fdc_nested);
- #endif
- local_irq_save(flags);
- while (!try_fdc(drive))
- sleep_on(&fdc_wait);
- fdc_busy = drive;
- fdc_nested++;
- local_irq_restore(flags);
- }
- static inline void rel_fdc(void)
- {
- #ifdef DEBUG
- if (fdc_nested == 0)
- printk("fd: unmatched rel_fdcn");
- printk("rel_fdc: fdc_busy %d fdc_nested %dn",fdc_busy,fdc_nested);
- #endif
- fdc_nested--;
- if (fdc_nested == 0) {
- fdc_busy = -1;
- wake_up(&fdc_wait);
- }
- }
- static void fd_select (int drive)
- {
- unsigned char prb = ~0;
- drive&=3;
- #ifdef DEBUG
- printk("selecting %dn",drive);
- #endif
- if (drive == selected)
- return;
- get_fdc(drive);
- selected = drive;
- if (unit[drive].track % 2 != 0)
- prb &= ~DSKSIDE;
- if (unit[drive].motor == 1)
- prb &= ~DSKMOTOR;
- ciab.prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
- ciab.prb = prb;
- prb &= ~SELMASK(drive);
- ciab.prb = prb;
- rel_fdc();
- }
- static void fd_deselect (int drive)
- {
- unsigned char prb;
- unsigned long flags;
- drive&=3;
- #ifdef DEBUG
- printk("deselecting %dn",drive);
- #endif
- if (drive != selected) {
- printk(KERN_WARNING "Deselecting drive %d while %d was selected!n",drive,selected);
- return;
- }
- get_fdc(drive);
- local_irq_save(flags);
- selected = -1;
- prb = ciab.prb;
- prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
- ciab.prb = prb;
- local_irq_restore (flags);
- rel_fdc();
- }
- static void motor_on_callback(unsigned long nr)
- {
- if (!(ciaa.pra & DSKRDY) || --on_attempts == 0) {
- wake_up (&motor_wait);
- } else {
- motor_on_timer.expires = jiffies + HZ/10;
- add_timer(&motor_on_timer);
- }
- }
- static int fd_motor_on(int nr)
- {
- nr &= 3;
- del_timer(motor_off_timer + nr);
- if (!unit[nr].motor) {
- unit[nr].motor = 1;
- fd_select(nr);
- motor_on_timer.data = nr;
- mod_timer(&motor_on_timer, jiffies + HZ/2);
- on_attempts = 10;
- sleep_on (&motor_wait);
- fd_deselect(nr);
- }
- if (on_attempts == 0) {
- on_attempts = -1;
- #if 0
- printk (KERN_ERR "motor_on failed, turning motor offn");
- fd_motor_off (nr);
- return 0;
- #else
- printk (KERN_WARNING "DSKRDY not set after 1.5 seconds - assuming drive is spinning notwithstandingn");
- #endif
- }
- return 1;
- }
- static void fd_motor_off(unsigned long drive)
- {
- long calledfromint;
- #ifdef MODULE
- long decusecount;
- decusecount = drive & 0x40000000;
- #endif
- calledfromint = drive & 0x80000000;
- drive&=3;
- if (calledfromint && !try_fdc(drive)) {
- /* We would be blocked in an interrupt, so try again later */
- motor_off_timer[drive].expires = jiffies + 1;
- add_timer(motor_off_timer + drive);
- return;
- }
- unit[drive].motor = 0;
- fd_select(drive);
- udelay (1);
- fd_deselect(drive);
- }
- static void floppy_off (unsigned int nr)
- {
- int drive;
- drive = nr & 3;
- /* called this way it is always from interrupt */
- motor_off_timer[drive].data = nr | 0x80000000;
- mod_timer(motor_off_timer + drive, jiffies + 3*HZ);
- }
- static int fd_calibrate(int drive)
- {
- unsigned char prb;
- int n;
- drive &= 3;
- get_fdc(drive);
- if (!fd_motor_on (drive))
- return 0;
- fd_select (drive);
- prb = ciab.prb;
- prb |= DSKSIDE;
- prb &= ~DSKDIREC;
- ciab.prb = prb;
- for (n = unit[drive].type->tracks/2; n != 0; --n) {
- if (ciaa.pra & DSKTRACK0)
- break;
- prb &= ~DSKSTEP;
- ciab.prb = prb;
- prb |= DSKSTEP;
- udelay (2);
- ciab.prb = prb;
- ms_delay(unit[drive].type->step_delay);
- }
- ms_delay (unit[drive].type->settle_time);
- prb |= DSKDIREC;
- n = unit[drive].type->tracks + 20;
- for (;;) {
- prb &= ~DSKSTEP;
- ciab.prb = prb;
- prb |= DSKSTEP;
- udelay (2);
- ciab.prb = prb;
- ms_delay(unit[drive].type->step_delay + 1);
- if ((ciaa.pra & DSKTRACK0) == 0)
- break;
- if (--n == 0) {
- printk (KERN_ERR "fd%d: calibrate failed, turning motor offn", drive);
- fd_motor_off (drive);
- unit[drive].track = -1;
- rel_fdc();
- return 0;
- }
- }
- unit[drive].track = 0;
- ms_delay(unit[drive].type->settle_time);
- rel_fdc();
- fd_deselect(drive);
- return 1;
- }
- static int fd_seek(int drive, int track)
- {
- unsigned char prb;
- int cnt;
- #ifdef DEBUG
- printk("seeking drive %d to track %dn",drive,track);
- #endif
- drive &= 3;
- get_fdc(drive);
- if (unit[drive].track == track) {
- rel_fdc();
- return 1;
- }
- if (!fd_motor_on(drive)) {
- rel_fdc();
- return 0;
- }
- if (unit[drive].track < 0 && !fd_calibrate(drive)) {
- rel_fdc();
- return 0;
- }
- fd_select (drive);
- cnt = unit[drive].track/2 - track/2;
- prb = ciab.prb;
- prb |= DSKSIDE | DSKDIREC;
- if (track % 2 != 0)
- prb &= ~DSKSIDE;
- if (cnt < 0) {
- cnt = - cnt;
- prb &= ~DSKDIREC;
- }
- ciab.prb = prb;
- if (track % 2 != unit[drive].track % 2)
- ms_delay (unit[drive].type->side_time);
- unit[drive].track = track;
- if (cnt == 0) {
- rel_fdc();
- fd_deselect(drive);
- return 1;
- }
- do {
- prb &= ~DSKSTEP;
- ciab.prb = prb;
- prb |= DSKSTEP;
- udelay (1);
- ciab.prb = prb;
- ms_delay (unit[drive].type->step_delay);
- } while (--cnt != 0);
- ms_delay (unit[drive].type->settle_time);
- rel_fdc();
- fd_deselect(drive);
- return 1;
- }
- static unsigned long fd_get_drive_id(int drive)
- {
- int i;
- ulong id = 0;
- drive&=3;
- get_fdc(drive);
- /* set up for ID */
- MOTOR_ON;
- udelay(2);
- SELECT(SELMASK(drive));
- udelay(2);
- DESELECT(SELMASK(drive));
- udelay(2);
- MOTOR_OFF;
- udelay(2);
- SELECT(SELMASK(drive));
- udelay(2);
- DESELECT(SELMASK(drive));
- udelay(2);
- /* loop and read disk ID */
- for (i=0; i<32; i++) {
- SELECT(SELMASK(drive));
- udelay(2);
- /* read and store value of DSKRDY */
- id <<= 1;
- id |= (ciaa.pra & DSKRDY) ? 0 : 1; /* cia regs are low-active! */
- DESELECT(SELMASK(drive));
- }
- rel_fdc();
- /*
- * RB: At least A500/A2000's df0: don't identify themselves.
- * As every (real) Amiga has at least a 3.5" DD drive as df0:
- * we default to that if df0: doesn't identify as a certain
- * type.
- */
- if(drive == 0 && id == FD_NODRIVE)
- {
- id = fd_def_df0;
- printk(KERN_NOTICE "fd: drive 0 didn't identify, setting default %08lxn", (ulong)fd_def_df0);
- }
- /* return the ID value */
- return (id);
- }
- static irqreturn_t fd_block_done(int irq, void *dummy, struct pt_regs *fp)
- {
- if (block_flag)
- custom.dsklen = 0x4000;
- if (block_flag == 2) { /* writing */
- writepending = 2;
- post_write_timer.expires = jiffies + 1; /* at least 2 ms */
- post_write_timer.data = selected;
- add_timer(&post_write_timer);
- }
- else { /* reading */
- block_flag = 0;
- wake_up (&wait_fd_block);
- }
- return IRQ_HANDLED;
- }
- static void raw_read(int drive)
- {
- drive&=3;
- get_fdc(drive);
- while (block_flag)
- sleep_on(&wait_fd_block);
- fd_select(drive);
- /* setup adkcon bits correctly */
- custom.adkcon = ADK_MSBSYNC;
- custom.adkcon = ADK_SETCLR|ADK_WORDSYNC|ADK_FAST;
- custom.dsksync = MFM_SYNC;
- custom.dsklen = 0;
- custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf);
- custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN;
- custom.dsklen = unit[drive].type->read_size/sizeof(short) | DSKLEN_DMAEN;
- block_flag = 1;
- while (block_flag)
- sleep_on (&wait_fd_block);
- custom.dsklen = 0;
- fd_deselect(drive);
- rel_fdc();
- }
- static int raw_write(int drive)
- {
- ushort adk;
- drive&=3;
- get_fdc(drive); /* corresponds to rel_fdc() in post_write() */
- if ((ciaa.pra & DSKPROT) == 0) {
- rel_fdc();
- return 0;
- }
- while (block_flag)
- sleep_on(&wait_fd_block);
- fd_select(drive);
- /* clear adkcon bits */
- custom.adkcon = ADK_PRECOMP1|ADK_PRECOMP0|ADK_WORDSYNC|ADK_MSBSYNC;
- /* set appropriate adkcon bits */
- adk = ADK_SETCLR|ADK_FAST;
- if ((ulong)unit[drive].track >= unit[drive].type->precomp2)
- adk |= ADK_PRECOMP1;
- else if ((ulong)unit[drive].track >= unit[drive].type->precomp1)
- adk |= ADK_PRECOMP0;
- custom.adkcon = adk;
- custom.dsklen = DSKLEN_WRITE;
- custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)raw_buf);
- custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE;
- custom.dsklen = unit[drive].type->write_size/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE;
- block_flag = 2;
- return 1;
- }
- /*
- * to be called at least 2ms after the write has finished but before any
- * other access to the hardware.
- */
- static void post_write (unsigned long drive)
- {
- #ifdef DEBUG
- printk("post_write for drive %ldn",drive);
- #endif
- drive &= 3;
- custom.dsklen = 0;
- block_flag = 0;
- writepending = 0;
- writefromint = 0;
- unit[drive].dirty = 0;
- wake_up(&wait_fd_block);
- fd_deselect(drive);
- rel_fdc(); /* corresponds to get_fdc() in raw_write */
- }
- /*
- * The following functions are to convert the block contents into raw data
- * written to disk and vice versa.
- * (Add other formats here ;-))
- */
- static unsigned long scan_sync(unsigned long raw, unsigned long end)
- {
- ushort *ptr = (ushort *)raw, *endp = (ushort *)end;
- while (ptr < endp && *ptr++ != 0x4489)
- ;
- if (ptr < endp) {
- while (*ptr == 0x4489 && ptr < endp)
- ptr++;
- return (ulong)ptr;
- }
- return 0;
- }
- static inline unsigned long checksum(unsigned long *addr, int len)
- {
- unsigned long csum = 0;
- len /= sizeof(*addr);
- while (len-- > 0)
- csum ^= *addr++;
- csum = ((csum>>1) & 0x55555555) ^ (csum & 0x55555555);
- return csum;
- }
- static unsigned long decode (unsigned long *data, unsigned long *raw,
- int len)
- {
- ulong *odd, *even;
- /* convert length from bytes to longwords */
- len >>= 2;
- odd = raw;
- even = odd + len;
- /* prepare return pointer */
- raw += len * 2;
- do {
- *data++ = ((*odd++ & 0x55555555) << 1) | (*even++ & 0x55555555);
- } while (--len != 0);
- return (ulong)raw;
- }
- struct header {
- unsigned char magic;
- unsigned char track;
- unsigned char sect;
- unsigned char ord;
- unsigned char labels[16];
- unsigned long hdrchk;
- unsigned long datachk;
- };
- static int amiga_read(int drive)
- {
- unsigned long raw;
- unsigned long end;
- int scnt;
- unsigned long csum;
- struct header hdr;
- drive&=3;
- raw = (long) raw_buf;
- end = raw + unit[drive].type->read_size;
- for (scnt = 0;scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) {
- if (!(raw = scan_sync(raw, end))) {
- printk (KERN_INFO "can't find sync for sector %dn", scnt);
- return MFM_NOSYNC;
- }
- raw = decode ((ulong *)&hdr.magic, (ulong *)raw, 4);
- raw = decode ((ulong *)&hdr.labels, (ulong *)raw, 16);
- raw = decode ((ulong *)&hdr.hdrchk, (ulong *)raw, 4);
- raw = decode ((ulong *)&hdr.datachk, (ulong *)raw, 4);
- csum = checksum((ulong *)&hdr,
- (char *)&hdr.hdrchk-(char *)&hdr);
- #ifdef DEBUG
- printk ("(%x,%d,%d,%d) (%lx,%lx,%lx,%lx) %lx %lxn",
- hdr.magic, hdr.track, hdr.sect, hdr.ord,
- *(ulong *)&hdr.labels[0], *(ulong *)&hdr.labels[4],
- *(ulong *)&hdr.labels[8], *(ulong *)&hdr.labels[12],
- hdr.hdrchk, hdr.datachk);
- #endif
- if (hdr.hdrchk != csum) {
- printk(KERN_INFO "MFM_HEADER: %08lx,%08lxn", hdr.hdrchk, csum);
- return MFM_HEADER;
- }
- /* verify track */
- if (hdr.track != unit[drive].track) {
- printk(KERN_INFO "MFM_TRACK: %d, %dn", hdr.track, unit[drive].track);
- return MFM_TRACK;
- }
- raw = decode ((ulong *)(unit[drive].trackbuf + hdr.sect*512),
- (ulong *)raw, 512);
- csum = checksum((ulong *)(unit[drive].trackbuf + hdr.sect*512), 512);
- if (hdr.datachk != csum) {
- printk(KERN_INFO "MFM_DATA: (%x:%d:%d:%d) sc=%d %lx, %lxn",
- hdr.magic, hdr.track, hdr.sect, hdr.ord, scnt,
- hdr.datachk, csum);
- printk (KERN_INFO "data=(%lx,%lx,%lx,%lx)n",
- ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[0],
- ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[1],
- ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[2],
- ((ulong *)(unit[drive].trackbuf+hdr.sect*512))[3]);
- return MFM_DATA;
- }
- }
- return 0;
- }
- static void encode(unsigned long data, unsigned long *dest)
- {
- unsigned long data2;
- data &= 0x55555555;
- data2 = data ^ 0x55555555;
- data |= ((data2 >> 1) | 0x80000000) & (data2 << 1);
- if (*(dest - 1) & 0x00000001)
- data &= 0x7FFFFFFF;
- *dest = data;
- }
- static void encode_block(unsigned long *dest, unsigned long *src, int len)
- {
- int cnt, to_cnt = 0;
- unsigned long data;
- /* odd bits */
- for (cnt = 0; cnt < len / 4; cnt++) {
- data = src[cnt] >> 1;
- encode(data, dest + to_cnt++);
- }
- /* even bits */
- for (cnt = 0; cnt < len / 4; cnt++) {
- data = src[cnt];
- encode(data, dest + to_cnt++);
- }
- }
- static unsigned long *putsec(int disk, unsigned long *raw, int cnt)
- {
- struct header hdr;
- int i;
- disk&=3;
- *raw = (raw[-1]&1) ? 0x2AAAAAAA : 0xAAAAAAAA;
- raw++;
- *raw++ = 0x44894489;
- hdr.magic = 0xFF;
- hdr.track = unit[disk].track;
- hdr.sect = cnt;
- hdr.ord = unit[disk].dtype->sects * unit[disk].type->sect_mult - cnt;
- for (i = 0; i < 16; i++)
- hdr.labels[i] = 0;
- hdr.hdrchk = checksum((ulong *)&hdr,
- (char *)&hdr.hdrchk-(char *)&hdr);
- hdr.datachk = checksum((ulong *)(unit[disk].trackbuf+cnt*512), 512);
- encode_block(raw, (ulong *)&hdr.magic, 4);
- raw += 2;
- encode_block(raw, (ulong *)&hdr.labels, 16);
- raw += 8;
- encode_block(raw, (ulong *)&hdr.hdrchk, 4);
- raw += 2;
- encode_block(raw, (ulong *)&hdr.datachk, 4);
- raw += 2;
- encode_block(raw, (ulong *)(unit[disk].trackbuf+cnt*512), 512);
- raw += 256;
- return raw;
- }
- static void amiga_write(int disk)
- {
- unsigned int cnt;
- unsigned long *ptr = (unsigned long *)raw_buf;
- disk&=3;
- /* gap space */
- for (cnt = 0; cnt < 415 * unit[disk].type->sect_mult; cnt++)
- *ptr++ = 0xaaaaaaaa;
- /* sectors */
- for (cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++)
- ptr = putsec (disk, ptr, cnt);
- *(ushort *)ptr = (ptr[-1]&1) ? 0x2AA8 : 0xAAA8;
- }
- struct dos_header {
- unsigned char track, /* 0-80 */
- side, /* 0-1 */
- sec, /* 0-...*/
- len_desc;/* 2 */
- unsigned short crc; /* on 68000 we got an alignment problem,
- but this compiler solves it by adding silently
- adding a pad byte so data won't fit
- and this took about 3h to discover.... */
- unsigned char gap1[22]; /* for longword-alignedness (0x4e) */
- };
- /* crc routines are borrowed from the messydos-handler */
- /* excerpt from the messydos-device
- ; The CRC is computed not only over the actual data, but including
- ; the SYNC mark (3 * $a1) and the 'ID/DATA - Address Mark' ($fe/$fb).
- ; As we don't read or encode these fields into our buffers, we have to
- ; preload the registers containing the CRC with the values they would have
- ; after stepping over these fields.
- ;
- ; How CRCs "really" work:
- ;
- ; First, you should regard a bitstring as a series of coefficients of
- ; polynomials. We calculate with these polynomials in modulo-2
- ; arithmetic, in which both add and subtract are done the same as
- ; exclusive-or. Now, we modify our data (a very long polynomial) in
- ; such a way that it becomes divisible by the CCITT-standard 16-bit
- ; 16 12 5
- ; polynomial: x + x + x + 1, represented by $11021. The easiest
- ; way to do this would be to multiply (using proper arithmetic) our
- ; datablock with $11021. So we have:
- ; data * $11021 =
- ; data * ($10000 + $1021) =
- ; data * $10000 + data * $1021
- ; The left part of this is simple: Just add two 0 bytes. But then
- ; the right part (data $1021) remains difficult and even could have
- ; a carry into the left part. The solution is to use a modified
- ; multiplication, which has a result that is not correct, but with
- ; a difference of any multiple of $11021. We then only need to keep
- ; the 16 least significant bits of the result.
- ;
- ; The following algorithm does this for us:
- ;
- ; unsigned char *data, c, crclo, crchi;
- ; while (not done) {
- ; c = *data++ + crchi;
- ; crchi = (@ c) >> 8 + crclo;
- ; crclo = @ c;
- ; }
- ;
- ; Remember, + is done with EOR, the @ operator is in two tables (high
- ; and low byte separately), which is calculated as
- ;
- ; $1021 * (c & $F0)
- ; xor $1021 * (c & $0F)
- ; xor $1021 * (c >> 4) (* is regular multiplication)
- ;
- ;
- ; Anyway, the end result is the same as the remainder of the division of
- ; the data by $11021. I am afraid I need to study theory a bit more...
- my only works was to code this from manx to C....
- */
- static ushort dos_crc(void * data_a3, int data_d0, int data_d1, int data_d3)
- {
- static unsigned char CRCTable1[] = {
- 0x00,0x10,0x20,0x30,0x40,0x50,0x60,0x70,0x81,0x91,0xa1,0xb1,0xc1,0xd1,0xe1,0xf1,
- 0x12,0x02,0x32,0x22,0x52,0x42,0x72,0x62,0x93,0x83,0xb3,0xa3,0xd3,0xc3,0xf3,0xe3,
- 0x24,0x34,0x04,0x14,0x64,0x74,0x44,0x54,0xa5,0xb5,0x85,0x95,0xe5,0xf5,0xc5,0xd5,
- 0x36,0x26,0x16,0x06,0x76,0x66,0x56,0x46,0xb7,0xa7,0x97,0x87,0xf7,0xe7,0xd7,0xc7,
- 0x48,0x58,0x68,0x78,0x08,0x18,0x28,0x38,0xc9,0xd9,0xe9,0xf9,0x89,0x99,0xa9,0xb9,
- 0x5a,0x4a,0x7a,0x6a,0x1a,0x0a,0x3a,0x2a,0xdb,0xcb,0xfb,0xeb,0x9b,0x8b,0xbb,0xab,
- 0x6c,0x7c,0x4c,0x5c,0x2c,0x3c,0x0c,0x1c,0xed,0xfd,0xcd,0xdd,0xad,0xbd,0x8d,0x9d,
- 0x7e,0x6e,0x5e,0x4e,0x3e,0x2e,0x1e,0x0e,0xff,0xef,0xdf,0xcf,0xbf,0xaf,0x9f,0x8f,
- 0x91,0x81,0xb1,0xa1,0xd1,0xc1,0xf1,0xe1,0x10,0x00,0x30,0x20,0x50,0x40,0x70,0x60,
- 0x83,0x93,0xa3,0xb3,0xc3,0xd3,0xe3,0xf3,0x02,0x12,0x22,0x32,0x42,0x52,0x62,0x72,
- 0xb5,0xa5,0x95,0x85,0xf5,0xe5,0xd5,0xc5,0x34,0x24,0x14,0x04,0x74,0x64,0x54,0x44,
- 0xa7,0xb7,0x87,0x97,0xe7,0xf7,0xc7,0xd7,0x26,0x36,0x06,0x16,0x66,0x76,0x46,0x56,
- 0xd9,0xc9,0xf9,0xe9,0x99,0x89,0xb9,0xa9,0x58,0x48,0x78,0x68,0x18,0x08,0x38,0x28,
- 0xcb,0xdb,0xeb,0xfb,0x8b,0x9b,0xab,0xbb,0x4a,0x5a,0x6a,0x7a,0x0a,0x1a,0x2a,0x3a,
- 0xfd,0xed,0xdd,0xcd,0xbd,0xad,0x9d,0x8d,0x7c,0x6c,0x5c,0x4c,0x3c,0x2c,0x1c,0x0c,
- 0xef,0xff,0xcf,0xdf,0xaf,0xbf,0x8f,0x9f,0x6e,0x7e,0x4e,0x5e,0x2e,0x3e,0x0e,0x1e
- };
- static unsigned char CRCTable2[] = {
- 0x00,0x21,0x42,0x63,0x84,0xa5,0xc6,0xe7,0x08,0x29,0x4a,0x6b,0x8c,0xad,0xce,0xef,
- 0x31,0x10,0x73,0x52,0xb5,0x94,0xf7,0xd6,0x39,0x18,0x7b,0x5a,0xbd,0x9c,0xff,0xde,
- 0x62,0x43,0x20,0x01,0xe6,0xc7,0xa4,0x85,0x6a,0x4b,0x28,0x09,0xee,0xcf,0xac,0x8d,
- 0x53,0x72,0x11,0x30,0xd7,0xf6,0x95,0xb4,0x5b,0x7a,0x19,0x38,0xdf,0xfe,0x9d,0xbc,
- 0xc4,0xe5,0x86,0xa7,0x40,0x61,0x02,0x23,0xcc,0xed,0x8e,0xaf,0x48,0x69,0x0a,0x2b,
- 0xf5,0xd4,0xb7,0x96,0x71,0x50,0x33,0x12,0xfd,0xdc,0xbf,0x9e,0x79,0x58,0x3b,0x1a,
- 0xa6,0x87,0xe4,0xc5,0x22,0x03,0x60,0x41,0xae,0x8f,0xec,0xcd,0x2a,0x0b,0x68,0x49,
- 0x97,0xb6,0xd5,0xf4,0x13,0x32,0x51,0x70,0x9f,0xbe,0xdd,0xfc,0x1b,0x3a,0x59,0x78,
- 0x88,0xa9,0xca,0xeb,0x0c,0x2d,0x4e,0x6f,0x80,0xa1,0xc2,0xe3,0x04,0x25,0x46,0x67,
- 0xb9,0x98,0xfb,0xda,0x3d,0x1c,0x7f,0x5e,0xb1,0x90,0xf3,0xd2,0x35,0x14,0x77,0x56,
- 0xea,0xcb,0xa8,0x89,0x6e,0x4f,0x2c,0x0d,0xe2,0xc3,0xa0,0x81,0x66,0x47,0x24,0x05,
- 0xdb,0xfa,0x99,0xb8,0x5f,0x7e,0x1d,0x3c,0xd3,0xf2,0x91,0xb0,0x57,0x76,0x15,0x34,
- 0x4c,0x6d,0x0e,0x2f,0xc8,0xe9,0x8a,0xab,0x44,0x65,0x06,0x27,0xc0,0xe1,0x82,0xa3,
- 0x7d,0x5c,0x3f,0x1e,0xf9,0xd8,0xbb,0x9a,0x75,0x54,0x37,0x16,0xf1,0xd0,0xb3,0x92,
- 0x2e,0x0f,0x6c,0x4d,0xaa,0x8b,0xe8,0xc9,0x26,0x07,0x64,0x45,0xa2,0x83,0xe0,0xc1,
- 0x1f,0x3e,0x5d,0x7c,0x9b,0xba,0xd9,0xf8,0x17,0x36,0x55,0x74,0x93,0xb2,0xd1,0xf0
- };
- /* look at the asm-code - what looks in C a bit strange is almost as good as handmade */
- register int i;
- register unsigned char *CRCT1, *CRCT2, *data, c, crch, crcl;
- CRCT1=CRCTable1;
- CRCT2=CRCTable2;
- data=data_a3;
- crcl=data_d1;
- crch=data_d0;
- for (i=data_d3; i>=0; i--) {
- c = (*data++) ^ crch;
- crch = CRCT1[c] ^ crcl;
- crcl = CRCT2[c];
- }
- return (crch<<8)|crcl;
- }
- static inline ushort dos_hdr_crc (struct dos_header *hdr)
- {
- return dos_crc(&(hdr->track), 0xb2, 0x30, 3); /* precomputed magic */
- }
- static inline ushort dos_data_crc(unsigned char *data)
- {
- return dos_crc(data, 0xe2, 0x95 ,511); /* precomputed magic */
- }
- static inline unsigned char dos_decode_byte(ushort word)
- {
- register ushort w2;
- register unsigned char byte;
- register unsigned char *dec = mfmdecode;
- w2=word;
- w2>>=8;
- w2&=127;
- byte = dec[w2];
- byte <<= 4;
- w2 = word & 127;
- byte |= dec[w2];
- return byte;
- }
- static unsigned long dos_decode(unsigned char *data, unsigned short *raw, int len)
- {
- int i;
- for (i = 0; i < len; i++)
- *data++=dos_decode_byte(*raw++);
- return ((ulong)raw);
- }
- #ifdef DEBUG
- static void dbg(unsigned long ptr)
- {
- printk("raw data @%08lx: %08lx, %08lx ,%08lx, %08lxn", ptr,
- ((ulong *)ptr)[0], ((ulong *)ptr)[1],
- ((ulong *)ptr)[2], ((ulong *)ptr)[3]);
- }
- #endif
- static int dos_read(int drive)
- {
- unsigned long end;
- unsigned long raw;
- int scnt;
- unsigned short crc,data_crc[2];
- struct dos_header hdr;
- drive&=3;
- raw = (long) raw_buf;
- end = raw + unit[drive].type->read_size;
- for (scnt=0; scnt < unit[drive].dtype->sects * unit[drive].type->sect_mult; scnt++) {
- do { /* search for the right sync of each sec-hdr */
- if (!(raw = scan_sync (raw, end))) {
- printk(KERN_INFO "dos_read: no hdr sync on "
- "track %d, unit %d for sector %dn",
- unit[drive].track,drive,scnt);
- return MFM_NOSYNC;
- }
- #ifdef DEBUG
- dbg(raw);
- #endif
- } while (*((ushort *)raw)!=0x5554); /* loop usually only once done */
- raw+=2; /* skip over headermark */
- raw = dos_decode((unsigned char *)&hdr,(ushort *) raw,8);
- crc = dos_hdr_crc(&hdr);
- #ifdef DEBUG
- printk("(%3d,%d,%2d,%d) %xn", hdr.track, hdr.side,
- hdr.sec, hdr.len_desc, hdr.crc);
- #endif
- if (crc != hdr.crc) {
- printk(KERN_INFO "dos_read: MFM_HEADER %04x,%04xn",
- hdr.crc, crc);
- return MFM_HEADER;
- }
- if (hdr.track != unit[drive].track/unit[drive].type->heads) {
- printk(KERN_INFO "dos_read: MFM_TRACK %d, %dn",
- hdr.track,
- unit[drive].track/unit[drive].type->heads);
- return MFM_TRACK;
- }
- if (hdr.side != unit[drive].track%unit[drive].type->heads) {
- printk(KERN_INFO "dos_read: MFM_SIDE %d, %dn",
- hdr.side,
- unit[drive].track%unit[drive].type->heads);
- return MFM_TRACK;
- }
- if (hdr.len_desc != 2) {
- printk(KERN_INFO "dos_read: unknown sector len "
- "descriptor %dn", hdr.len_desc);
- return MFM_DATA;
- }
- #ifdef DEBUG
- printk("hdr acceptedn");
- #endif
- if (!(raw = scan_sync (raw, end))) {
- printk(KERN_INFO "dos_read: no data sync on track "
- "%d, unit %d for sector%d, disk sector %dn",
- unit[drive].track, drive, scnt, hdr.sec);
- return MFM_NOSYNC;
- }
- #ifdef DEBUG
- dbg(raw);
- #endif
- if (*((ushort *)raw)!=0x5545) {
- printk(KERN_INFO "dos_read: no data mark after "
- "sync (%d,%d,%d,%d) sc=%dn",
- hdr.track,hdr.side,hdr.sec,hdr.len_desc,scnt);
- return MFM_NOSYNC;
- }
- raw+=2; /* skip data mark (included in checksum) */
- raw = dos_decode((unsigned char *)(unit[drive].trackbuf + (hdr.sec - 1) * 512), (ushort *) raw, 512);
- raw = dos_decode((unsigned char *)data_crc,(ushort *) raw,4);
- crc = dos_data_crc(unit[drive].trackbuf + (hdr.sec - 1) * 512);
- if (crc != data_crc[0]) {
- printk(KERN_INFO "dos_read: MFM_DATA (%d,%d,%d,%d) "
- "sc=%d, %x %xn", hdr.track, hdr.side,
- hdr.sec, hdr.len_desc, scnt,data_crc[0], crc);
- printk(KERN_INFO "data=(%lx,%lx,%lx,%lx,...)n",
- ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[0],
- ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[1],
- ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[2],
- ((ulong *)(unit[drive].trackbuf+(hdr.sec-1)*512))[3]);
- return MFM_DATA;
- }
- }
- return 0;
- }
- static inline ushort dos_encode_byte(unsigned char byte)
- {
- register unsigned char *enc, b2, b1;
- register ushort word;
- enc=mfmencode;
- b1=byte;
- b2=b1>>4;
- b1&=15;
- word=enc[b2] <<8 | enc [b1];
- return (word|((word&(256|64)) ? 0: 128));
- }
- static void dos_encode_block(ushort *dest, unsigned char *src, int len)
- {
- int i;
- for (i = 0; i < len; i++) {
- *dest=dos_encode_byte(*src++);
- *dest|=((dest[-1]&1)||(*dest&0x4000))? 0: 0x8000;
- dest++;
- }
- }
- static unsigned long *ms_putsec(int drive, unsigned long *raw, int cnt)
- {
- static struct dos_header hdr={0,0,0,2,0,
- {78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78,78}};
- int i;
- static ushort crc[2]={0,0x4e4e};
- drive&=3;
- /* id gap 1 */
- /* the MFM word before is always 9254 */
- for(i=0;i<6;i++)
- *raw++=0xaaaaaaaa;
- /* 3 sync + 1 headermark */
- *raw++=0x44894489;
- *raw++=0x44895554;
- /* fill in the variable parts of the header */
- hdr.track=unit[drive].track/unit[drive].type->heads;
- hdr.side=unit[drive].track%unit[drive].type->heads;
- hdr.sec=cnt+1;
- hdr.crc=dos_hdr_crc(&hdr);
- /* header (without "magic") and id gap 2*/
- dos_encode_block((ushort *)raw,(unsigned char *) &hdr.track,28);
- raw+=14;
- /*id gap 3 */
- for(i=0;i<6;i++)
- *raw++=0xaaaaaaaa;
- /* 3 syncs and 1 datamark */
- *raw++=0x44894489;
- *raw++=0x44895545;
- /* data */
- dos_encode_block((ushort *)raw,
- (unsigned char *)unit[drive].trackbuf+cnt*512,512);
- raw+=256;
- /*data crc + jd's special gap (long words :-/) */
- crc[0]=dos_data_crc(unit[drive].trackbuf+cnt*512);
- dos_encode_block((ushort *) raw,(unsigned char *)crc,4);
- raw+=2;
- /* data gap */
- for(i=0;i<38;i++)
- *raw++=0x92549254;
- return raw; /* wrote 652 MFM words */
- }
- static void dos_write(int disk)
- {
- int cnt;
- unsigned long raw = (unsigned long) raw_buf;
- unsigned long *ptr=(unsigned long *)raw;
- disk&=3;
- /* really gap4 + indexgap , but we write it first and round it up */
- for (cnt=0;cnt<425;cnt++)
- *ptr++=0x92549254;
- /* the following is just guessed */
- if (unit[disk].type->sect_mult==2) /* check for HD-Disks */
- for(cnt=0;cnt<473;cnt++)
- *ptr++=0x92549254;
- /* now the index marks...*/
- for (cnt=0;cnt<20;cnt++)
- *ptr++=0x92549254;
- for (cnt=0;cnt<6;cnt++)
- *ptr++=0xaaaaaaaa;
- *ptr++=0x52245224;
- *ptr++=0x52245552;
- for (cnt=0;cnt<20;cnt++)
- *ptr++=0x92549254;
- /* sectors */
- for(cnt = 0; cnt < unit[disk].dtype->sects * unit[disk].type->sect_mult; cnt++)
- ptr=ms_putsec(disk,ptr,cnt);
- *(ushort *)ptr = 0xaaa8; /* MFM word before is always 0x9254 */
- }
- /*
- * Here comes the high level stuff (i.e. the filesystem interface)
- * and helper functions.
- * Normally this should be the only part that has to be adapted to
- * different kernel versions.
- */
- /* FIXME: this assumes the drive is still spinning -
- * which is only true if we complete writing a track within three seconds
- */
- static void flush_track_callback(unsigned long nr)
- {
- nr&=3;
- writefromint = 1;
- if (!try_fdc(nr)) {
- /* we might block in an interrupt, so try again later */
- flush_track_timer[nr].expires = jiffies + 1;
- add_timer(flush_track_timer + nr);
- return;
- }
- get_fdc(nr);
- (*unit[nr].dtype->write_fkt)(nr);
- if (!raw_write(nr)) {
- printk (KERN_NOTICE "floppy disk write protectedn");
- writefromint = 0;
- writepending = 0;
- }
- rel_fdc();
- }
- static int non_int_flush_track (unsigned long nr)
- {
- unsigned long flags;
- nr&=3;
- writefromint = 0;
- del_timer(&post_write_timer);
- get_fdc(nr);
- if (!fd_motor_on(nr)) {
- writepending = 0;
- rel_fdc();
- return 0;
- }
- local_irq_save(flags);
- if (writepending != 2) {
- local_irq_restore(flags);
- (*unit[nr].dtype->write_fkt)(nr);
- if (!raw_write(nr)) {
- printk (KERN_NOTICE "floppy disk write protected "
- "in write!n");
- writepending = 0;
- return 0;
- }
- while (block_flag == 2)
- sleep_on (&wait_fd_block);
- }
- else {
- local_irq_restore(flags);
- ms_delay(2); /* 2 ms post_write delay */
- post_write(nr);
- }
- rel_fdc();
- return 1;
- }
- static int get_track(int drive, int track)
- {
- int error, errcnt;
- drive&=3;
- if (unit[drive].track == track)
- return 0;
- get_fdc(drive);
- if (!fd_motor_on(drive)) {
- rel_fdc();
- return -1;
- }
- if (unit[drive].dirty == 1) {
- del_timer (flush_track_timer + drive);
- non_int_flush_track (drive);
- }
- errcnt = 0;
- while (errcnt < MAX_ERRORS) {
- if (!fd_seek(drive, track))
- return -1;
- raw_read(drive);
- error = (*unit[drive].dtype->read_fkt)(drive);
- if (error == 0) {
- rel_fdc();
- return 0;
- }
- /* Read Error Handling: recalibrate and try again */
- unit[drive].track = -1;
- errcnt++;
- }
- rel_fdc();
- return -1;
- }
- static void redo_fd_request(void)
- {
- unsigned int cnt, block, track, sector;
- int drive;
- struct amiga_floppy_struct *floppy;
- char *data;
- unsigned long flags;
- repeat:
- if (!CURRENT) {
- /* Nothing left to do */
- return;
- }
- floppy = CURRENT->rq_disk->private_data;
- drive = floppy - unit;
- /* Here someone could investigate to be more efficient */
- for (cnt = 0; cnt < CURRENT->current_nr_sectors; cnt++) {
- #ifdef DEBUG
- printk("fd: sector %ld + %d requested for %sn",
- CURRENT->sector,cnt,
- (CURRENT->cmd==READ)?"read":"write");
- #endif
- block = CURRENT->sector + cnt;
- if ((int)block > floppy->blocks) {
- end_request(CURRENT, 0);
- goto repeat;
- }
- track = block / (floppy->dtype->sects * floppy->type->sect_mult);
- sector = block % (floppy->dtype->sects * floppy->type->sect_mult);
- data = CURRENT->buffer + 512 * cnt;
- #ifdef DEBUG
- printk("access to track %d, sector %d, with buffer at "
- "0x%08lxn", track, sector, data);
- #endif
- if ((rq_data_dir(CURRENT) != READ) && (rq_data_dir(CURRENT) != WRITE)) {
- printk(KERN_WARNING "do_fd_request: unknown commandn");
- end_request(CURRENT, 0);
- goto repeat;
- }
- if (get_track(drive, track) == -1) {
- end_request(CURRENT, 0);
- goto repeat;
- }
- switch (rq_data_dir(CURRENT)) {
- case READ:
- memcpy(data, floppy->trackbuf + sector * 512, 512);
- break;
- case WRITE:
- memcpy(floppy->trackbuf + sector * 512, data, 512);
- /* keep the drive spinning while writes are scheduled */
- if (!fd_motor_on(drive)) {
- end_request(CURRENT, 0);
- goto repeat;
- }
- /*
- * setup a callback to write the track buffer
- * after a short (1 tick) delay.
- */
- local_irq_save(flags);
- floppy->dirty = 1;
- /* reset the timer */
- mod_timer (flush_track_timer + drive, jiffies + 1);
- local_irq_restore(flags);
- break;
- }
- }
- CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
- CURRENT->sector += CURRENT->current_nr_sectors;
- end_request(CURRENT, 1);
- goto repeat;
- }
- static void do_fd_request(request_queue_t * q)
- {
- redo_fd_request();
- }
- static int fd_ioctl(struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long param)
- {
- int drive = iminor(inode) & 3;
- static struct floppy_struct getprm;
- switch(cmd){
- case HDIO_GETGEO:
- {
- struct hd_geometry loc;
- loc.heads = unit[drive].type->heads;
- loc.sectors = unit[drive].dtype->sects * unit[drive].type->sect_mult;
- loc.cylinders = unit[drive].type->tracks;
- loc.start = 0;
- if (copy_to_user((void *)param, (void *)&loc,
- sizeof(struct hd_geometry)))
- return -EFAULT;
- break;
- }
- case FDFMTBEG:
- get_fdc(drive);
- if (fd_ref[drive] > 1) {
- rel_fdc();
- return -EBUSY;
- }
- fsync_bdev(inode->i_bdev);
- if (fd_motor_on(drive) == 0) {
- rel_fdc();
- return -ENODEV;
- }
- if (fd_calibrate(drive) == 0) {
- rel_fdc();
- return -ENXIO;
- }
- floppy_off(drive);
- rel_fdc();
- break;
- case FDFMTTRK:
- if (param < unit[drive].type->tracks * unit[drive].type->heads)
- {
- get_fdc(drive);
- if (fd_seek(drive,param) != 0){
- memset(unit[drive].trackbuf, FD_FILL_BYTE,
- unit[drive].dtype->sects * unit[drive].type->sect_mult * 512);
- non_int_flush_track(drive);
- }
- floppy_off(drive);
- rel_fdc();
- }
- else
- return -EINVAL;
- break;
- case FDFMTEND:
- floppy_off(drive);
- invalidate_bdev(inode->i_bdev, 0);
- break;
- case FDGETPRM:
- memset((void *)&getprm, 0, sizeof (getprm));
- getprm.track=unit[drive].type->tracks;
- getprm.head=unit[drive].type->heads;
- getprm.sect=unit[drive].dtype->sects * unit[drive].type->sect_mult;
- getprm.size=unit[drive].blocks;
- if (copy_to_user((void *)param,
- (void *)&getprm,
- sizeof(struct floppy_struct)))
- return -EFAULT;
- break;
- case FDSETPRM:
- case FDDEFPRM:
- return -EINVAL;
- case FDFLUSH: /* unconditionally, even if not needed */
- del_timer (flush_track_timer + drive);
- non_int_flush_track(drive);
- break;
- #ifdef RAW_IOCTL
- case IOCTL_RAW_TRACK:
- if (copy_to_user((void *)param, raw_buf,
- unit[drive].type->read_size))
- return -EFAULT;
- else
- return unit[drive].type->read_size;
- #endif
- default:
- printk(KERN_DEBUG "fd_ioctl: unknown cmd %d for drive %d.",
- cmd, drive);
- return -ENOSYS;
- }
- return 0;
- }
- static void fd_probe(int dev)
- {
- unsigned long code;
- int type;
- int drive;
- drive = dev & 3;
- code = fd_get_drive_id(drive);
- /* get drive type */
- for (type = 0; type < num_dr_types; type++)
- if (drive_types[type].code == code)
- break;
- if (type >= num_dr_types) {
- printk(KERN_WARNING "fd_probe: unsupported drive type "
- "%08lx foundn", code);
- unit[drive].type = &drive_types[num_dr_types-1]; /* FD_NODRIVE */
- return;
- }
- unit[drive].type = drive_types + type;
- unit[drive].track = -1;
- unit[drive].disk = -1;
- unit[drive].motor = 0;
- unit[drive].busy = 0;
- unit[drive].status = -1;
- }
- /*
- * 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 system = (iminor(inode) & 4) >> 2;
- int old_dev;
- unsigned long flags;
- old_dev = fd_device[drive];
- if (fd_ref[drive] && old_dev != system)
- return -EBUSY;
- if (filp && filp->f_mode & 3) {
- check_disk_change(inode->i_bdev);
- if (filp->f_mode & 2 ) {
- int wrprot;
- get_fdc(drive);
- fd_select (drive);
- wrprot = !(ciaa.pra & DSKPROT);
- fd_deselect (drive);
- rel_fdc();
- if (wrprot)
- return -EROFS;
- }
- }
- local_irq_save(flags);
- fd_ref[drive]++;
- fd_device[drive] = system;
- local_irq_restore(flags);
- unit[drive].dtype=&data_types[system];
- unit[drive].blocks=unit[drive].type->heads*unit[drive].type->tracks*
- data_types[system].sects*unit[drive].type->sect_mult;
- set_capacity(unit[drive].gendisk, unit[drive].blocks);
- printk(KERN_INFO "fd%d: accessing %s-disk with %s-layoutn",drive,
- unit[drive].type->name, data_types[system].name);
- return 0;
- }
- static int floppy_release(struct inode * inode, struct file * filp)
- {
- int drive = iminor(inode) & 3;
- if (unit[drive].dirty == 1) {
- del_timer (flush_track_timer + drive);
- non_int_flush_track (drive);
- }
- if (!fd_ref[drive]--) {
- printk(KERN_CRIT "floppy_release with fd_ref == 0");
- fd_ref[drive] = 0;
- }
- #ifdef MODULE
- /* the mod_use counter is handled this way */
- floppy_off (drive | 0x40000000);
- #endif
- return 0;
- }
- /*
- * floppy-change is never called from an interrupt, so we can relax a bit
- * here, sleep etc. Note that floppy-on tries to set current_DOR to point
- * to the desired drive, but it will probably not survive the sleep if
- * several floppies are used at the same time: thus the loop.
- */
- static int amiga_floppy_change(struct gendisk *disk)
- {
- struct amiga_floppy_struct *p = disk->private_data;
- int drive = p - unit;
- int changed;
- static int first_time = 1;
- if (first_time)
- changed = first_time--;
- else {
- get_fdc(drive);
- fd_select (drive);
- changed = !(ciaa.pra & DSKCHANGE);
- fd_deselect (drive);
- rel_fdc();
- }
- if (changed) {
- fd_probe(drive);
- p->track = -1;
- p->dirty = 0;
- writepending = 0; /* if this was true before, too bad! */
- writefromint = 0;
- return 1;
- }
- return 0;
- }
- static struct block_device_operations floppy_fops = {
- .owner = THIS_MODULE,
- .open = floppy_open,
- .release = floppy_release,
- .ioctl = fd_ioctl,
- .media_changed = amiga_floppy_change,
- };
- void __init amiga_floppy_setup (char *str, int *ints)
- {
- printk (KERN_INFO "amiflop: Setting default df0 to %xn", ints[1]);
- fd_def_df0 = ints[1];
- }
- static int __init fd_probe_drives(void)
- {
- int drive,drives,nomem;
- printk(KERN_INFO "FD: probing unitsn" KERN_INFO "found ");
- drives=0;
- nomem=0;
- for(drive=0;drive<FD_MAX_UNITS;drive++) {
- struct gendisk *disk;
- fd_probe(drive);
- if (unit[drive].type->code == FD_NODRIVE)
- continue;
- disk = alloc_disk(1);
- if (!disk) {
- unit[drive].type->code = FD_NODRIVE;
- continue;
- }
- unit[drive].gendisk = disk;
- drives++;
- if ((unit[drive].trackbuf = kmalloc(FLOPPY_MAX_SECTORS * 512, GFP_KERNEL)) == NULL) {
- printk("no mem for ");
- unit[drive].type = &drive_types[num_dr_types - 1]; /* FD_NODRIVE */
- drives--;
- nomem = 1;
- }
- printk("fd%d ",drive);
- disk->major = FLOPPY_MAJOR;
- disk->first_minor = drive;
- disk->fops = &floppy_fops;
- sprintf(disk->disk_name, "fd%d", drive);
- disk->private_data = &unit[drive];
- disk->queue = floppy_queue;
- set_capacity(disk, 880*2);
- add_disk(disk);
- }
- if ((drives > 0) || (nomem == 0)) {
- if (drives == 0)
- printk("no drives");
- printk("n");
- return drives;
- }
- printk("n");
- return -ENOMEM;
- }
- static struct kobject *floppy_find(dev_t dev, int *part, void *data)
- {
- int drive = *part & 3;
- if (unit[drive].type->code == FD_NODRIVE)
- return NULL;
- *part = 0;
- return get_disk(unit[drive].gendisk);
- }
- int __init amiga_floppy_init(void)
- {
- int i, ret;
- if (!AMIGAHW_PRESENT(AMI_FLOPPY))
- return -ENXIO;
- if (register_blkdev(FLOPPY_MAJOR,"fd"))
- return -EBUSY;
- /*
- * We request DSKPTR, DSKLEN and DSKDATA only, because the other
- * floppy registers are too spreaded over the custom register space
- */
- ret = -EBUSY;
- if (!request_mem_region(CUSTOM_PHYSADDR+0x20, 8, "amiflop [Paula]")) {
- printk("fd: cannot get floppy registersn");
- goto out_blkdev;
- }
- ret = -ENOMEM;
- if ((raw_buf = (char *)amiga_chip_alloc (RAW_BUF_SIZE, "Floppy")) ==
- NULL) {
- printk("fd: cannot get chip mem buffern");
- goto out_memregion;
- }
- ret = -EBUSY;
- if (request_irq(IRQ_AMIGA_DSKBLK, fd_block_done, 0, "floppy_dma", NULL)) {
- printk("fd: cannot get irq for dman");
- goto out_irq;
- }
- if (request_irq(IRQ_AMIGA_CIAA_TB, ms_isr, 0, "floppy_timer", NULL)) {
- printk("fd: cannot get irq for timern");
- goto out_irq2;
- }
- ret = -ENOMEM;
- floppy_queue = blk_init_queue(do_fd_request, &amiflop_lock);
- if (!floppy_queue)
- goto out_queue;
- ret = -ENXIO;
- if (fd_probe_drives() < 1) /* No usable drives */
- goto out_probe;
- blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
- floppy_find, NULL, NULL);
- /* initialize variables */
- init_timer(&motor_on_timer);
- motor_on_timer.expires = 0;
- motor_on_timer.data = 0;
- motor_on_timer.function = motor_on_callback;
- for (i = 0; i < FD_MAX_UNITS; i++) {
- init_timer(&motor_off_timer[i]);
- motor_off_timer[i].expires = 0;
- motor_off_timer[i].data = i|0x80000000;
- motor_off_timer[i].function = fd_motor_off;
- init_timer(&flush_track_timer[i]);
- flush_track_timer[i].expires = 0;
- flush_track_timer[i].data = i;
- flush_track_timer[i].function = flush_track_callback;
- unit[i].track = -1;
- }
- init_timer(&post_write_timer);
- post_write_timer.expires = 0;
- post_write_timer.data = 0;
- post_write_timer.function = post_write;
- for (i = 0; i < 128; i++)
- mfmdecode[i]=255;
- for (i = 0; i < 16; i++)
- mfmdecode[mfmencode[i]]=i;
- /* make sure that disk DMA is enabled */
- custom.dmacon = DMAF_SETCLR | DMAF_DISK;
- /* init ms timer */
- ciaa.crb = 8; /* one-shot, stop */
- return 0;
- out_probe:
- blk_cleanup_queue(floppy_queue);
- out_queue:
- free_irq(IRQ_AMIGA_CIAA_TB, NULL);
- out_irq2:
- free_irq(IRQ_AMIGA_DSKBLK, NULL);
- out_irq:
- amiga_chip_free(raw_buf);
- out_memregion:
- release_mem_region(CUSTOM_PHYSADDR+0x20, 8);
- out_blkdev:
- unregister_blkdev(FLOPPY_MAJOR,"fd");
- return ret;
- }
- #ifdef MODULE
- #include <linux/version.h>
- int init_module(void)
- {
- if (!MACH_IS_AMIGA)
- return -ENXIO;
- return amiga_floppy_init();
- }
- #if 0 /* not safe to unload */
- void cleanup_module(void)
- {
- int i;
- for( i = 0; i < FD_MAX_UNITS; i++) {
- if (unit[i].type->code != FD_NODRIVE) {
- del_gendisk(unit[i].gendisk);
- put_disk(unit[i].gendisk);
- kfree(unit[i].trackbuf);
- }
- }
- blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
- free_irq(IRQ_AMIGA_CIAA_TB, NULL);
- free_irq(IRQ_AMIGA_DSKBLK, NULL);
- custom.dmacon = DMAF_DISK; /* disable DMA */
- amiga_chip_free(raw_buf);
- blk_cleanup_queue(floppy_queue);
- release_mem_region(CUSTOM_PHYSADDR+0x20, 8);
- unregister_blkdev(FLOPPY_MAJOR, "fd");
- }
- #endif
- #endif