/*
* 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 1995 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.
*
* 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.
*/
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/fcntl.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/fd.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <asm/amifdreg.h>
#include <asm/amifd.h>
#include <asm/amigahw.h>
#include <asm/amigaints.h>
#include <asm/irq.h>
#include <asm/bootinfo.h>
#include <asm/amigatypes.h>
#define MAJOR_NR FLOPPY_MAJOR
#include <linux/blk.h>
#undef DEBUG /* print _LOTS_ of infos */
#define RAW_IOCTL
#ifdef RAW_IOCTL
#define IOCTL_RAW_TRACK 0x5254524B /* 'RTRK' */
#endif
/* prototypes */
static int amiga_read(int,unsigned char *, unsigned long, int);
static void amiga_write(int, unsigned long, unsigned char *, int);
static int dos_read(int, unsigned char *, unsigned long, int);
static void dos_write(int, unsigned long, unsigned char *,int);
static ushort dos_crc(void *, int, int, int);
static void fd_probe(int);
/*
* Defines
*/
#define MAX_SECTORS 22
/*
* 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) */
/*
* 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 int fd_def_df0 = 0; /* default for df0 if it doesn't identify */
/*
* 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)))
#define DRIVE(x) ((x) & 3)
#define PROBE(x) ((x) >> 2) & 1)
#define TYPE(x) ((x) >> 3) & 2)
#define DATA(x) ((x) >> 5) & 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", 160, 2, 14716, 13630, 1, 80,161, 3, 18, 1},
{ FD_HD_3, "HD 3.5", 160, 2, 28344, 27258, 2, 80,161, 3, 18, 1},
{ FD_DD_5, "DD 5.25", 80, 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]);
/* defaults for 3 1/2" HD-Disks */
static int floppy_sizes[256]={880,880,880,880,720,720,720,};
static int floppy_blocksizes[256]={0,};
/* hardsector size assumed to be 512 */
static struct fd_data_type data_types[] = {
{ "Amiga", 11 , amiga_read, amiga_write},
{ "MS-Dos", 9, dos_read, dos_write}
};
static int num_da_types = sizeof(data_types) / sizeof(data_types[0]);
/* current info on each unit */
static struct amiga_floppy_struct unit[FD_MAX_UNITS];
static struct timer_list flush_track_timer;
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;
/* track buffer */
static int lastdrive = -1;
static int savedtrack = -1;
static int writepending = 0;
static int writefromint = 0;
static unsigned char trackdata[MAX_SECTORS * 512];
static char *raw_buf;
#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 char block_flag = 0;
static int selected = 0;
static struct wait_queue *wait_fd_block = NULL;
/* Synchronization of FDC access. */
static volatile int fdc_busy = 0;
static struct wait_queue *fdc_wait = NULL;
static struct wait_queue *motor_wait = NULL;
/* 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 struct semaphore ms_sem = MUTEX;
static struct wait_queue *ms_wait = NULL;
#define MS_TICKS ((amiga_eclock+50)/1000)
static void ms_isr(int irq, struct pt_regs *fp, void *dummy)
{
wake_up(&ms_wait);
}
/* with the semaphore waits are queued up
A more generic routine would do a schedule a la timer.device */
static void ms_delay(int ms)
{
int ticks;
if (ms > 0) {
down(&ms_sem);
ticks=MS_TICKS*ms-1;
ciaa.tblo=ticks%256;
ciaa.tbhi=ticks/256;
ciaa.crb=0x19; /* count clock, force load, one-shot, start */
sleep_on(&ms_wait);
up(&ms_sem);
}
}
/*
* Functions
*/
/*======================================================================
Turn off the motor of the given drive. Unit must already be active.
Returns standard floppy error code.
======================================================================*/
static void fd_motor_off(unsigned long drive)
{
unsigned long flags;
unsigned char prb = ~0;
drive&=3;
save_flags(flags);
cli();
if (unit[drive].track % 2 != 0)
prb &= ~DSKSIDE;
ciab.prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
ciab.prb = prb;
prb &= ~SELMASK(drive);
ciab.prb = prb;
udelay (1);
prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
ciab.prb = prb;
selected = -1;
unit[drive].motor = 0;
restore_flags(flags);
}
static void motor_on_callback(unsigned long nr)
{
nr &= 3;
if (!(ciaa.pra & DSKRDY) || --on_attempts == 0) {
unit[nr].motor = 1;
wake_up (&motor_wait);
} else {
motor_on_timer.expires = jiffies + HZ/10;
add_timer(&motor_on_timer);
}
}
static int motor_on(int nr)
{
unsigned long flags;
unsigned char prb = ~0;
nr &= 3;
save_flags (flags);
cli();
del_timer(motor_off_timer + nr);
if (!unit[nr].motor) {
del_timer(&motor_on_timer);
motor_on_timer.data = nr;
motor_on_timer.expires = jiffies + HZ/2;
add_timer(&motor_on_timer);
on_attempts = 10;
prb &= ~DSKMOTOR;
if (unit[nr].track % 2 != 0)
prb &= ~DSKSIDE;
ciab.prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
ciab.prb = prb;
prb &= ~SELMASK(nr);
ciab.prb = prb;
selected = nr;
while (!unit[nr].motor)
sleep_on (&motor_wait);
}
restore_flags(flags);
if (on_attempts == 0) {
printk ("motor_on failed, turning motor off\n");
fd_motor_off (nr);
return 0;
}
return 1;
}
static void floppy_off (unsigned int nr)
{
nr&=3;
del_timer(motor_off_timer+nr);
motor_off_timer[nr].expires = jiffies + 3*HZ;
add_timer(motor_off_timer+nr);
}
static void fd_select (int drive)
{
unsigned char prb = ~0;
drive&=3;
if (drive == selected)
return;
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;
}
static void fd_deselect (int drive)
{
unsigned char prb;
unsigned long flags;
drive&=3;
if (drive != selected)
return;
save_flags (flags);
sti();
selected = -1;
prb = ciab.prb;
prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
ciab.prb = prb;
restore_flags (flags);
}
/*======================================================================
Seek the drive to track 0.
The drive must be active and the motor must be running.
Returns standard floppy error code.
======================================================================*/
static int fd_calibrate(int drive)
{
unsigned char prb;
int n;
drive &= 3;
if (!motor_on (drive))
return 0;
fd_select (drive);
prb = ciab.prb;
prb |= DSKSIDE;
prb &= ~DSKDIREC;
ciab.prb = prb;
for (n = unit[drive].type->tracks/4; n != 0; --n) {
if (ciaa.pra & DSKTRACK0)
break;
prb &= ~DSKSTEP;
ciab.prb = prb;
prb |= DSKSTEP;
ms_delay (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/2 + 20;
for (;;) {
prb &= ~DSKSTEP;
ciab.prb = prb;
prb |= DSKSTEP;
ms_delay (2);
ciab.prb = prb;
ms_delay(unit[drive].type->step_delay + 1);
if ((ciaa.pra & DSKTRACK0) == 0)
break;
if (--n == 0) {
printk ("calibrate failed, turning motor off\n");
fd_motor_off (drive);
unit[drive].track = -1;
return 0;
}
}
unit[drive].track = 0;
ms_delay(unit[drive].type->settle_time);
return 1;
}
/*======================================================================
Seek the drive to the requested cylinder.
The drive must have been calibrated at some point before this.
The drive must also be active and the motor must be running.
======================================================================*/
static int fd_seek(int drive, int track)
{
unsigned char prb;
int cnt;
drive &= 3;
if (unit[drive].track == track)
return 1;
if (!motor_on(drive))
return 0;
fd_select (drive);
if (unit[drive].track < 0 && !fd_calibrate(drive))
return 0;
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)
return 1;
do {
prb &= ~DSKSTEP;
ciab.prb = prb;
prb |= DSKSTEP;
ms_delay (1);
ciab.prb = prb;
ms_delay (unit[drive].type->step_delay);
} while (--cnt != 0);
ms_delay (unit[drive].type->settle_time);
return 1;
}
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++);
}
}
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;
}
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 unsigned long *putsec(int disk, unsigned long *raw, int track, int cnt,
unsigned char *data)
{
struct header hdr;
int i;
if (!AMIGAHW_PRESENT(AMI_FLOPPY))
return 0;
disk&=3;
*raw = (raw[-1]&1) ? 0x2AAAAAAA : 0xAAAAAAAA;
raw++;
*raw++ = 0x44894489;
hdr.magic = 0xFF;
hdr.track = track;
hdr.sect = cnt;
hdr.ord = unit[disk].sects-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 *)data, 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 *)data, 512);
raw += 256;
return raw;
}
/*==========================================================================
amiga_write converts track/labels data to raw track data
==========================================================================*/
static void amiga_write(int disk, unsigned long raw, unsigned char *data,
int track)
{
int cnt;
unsigned long *ptr = (unsigned long *)raw;
disk&=3;
/* gap space */
for (cnt = 0; cnt < 415 * unit[disk].type->sect_mult; cnt++)
*ptr++ = 0xaaaaaaaa;
/* sectors */
for (cnt = 0; cnt < unit[disk].sects; cnt++)
ptr = putsec (disk, ptr, track, cnt, data + cnt*512);
*(ushort *)ptr = (ptr[-1]&1) ? 0x2AA8 : 0xAAA8;
raw = (unsigned long)ptr + 2;
}
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;
}
#define MFM_NOSYNC 1
#define MFM_HEADER 2
#define MFM_DATA 3
#define MFM_TRACK 4
/*==========================================================================
scan_sync - looks for the next start of sector marked by a sync. d3 is the
sector number (10..0). When d3 = 10, can't be certain of a
starting sync.
==========================================================================*/
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;
}
/*==========================================================================
amiga_read reads a raw track of data into a track buffer
==========================================================================*/
static int amiga_read(int drive, unsigned char *track_data,
unsigned long raw, int track)
{
unsigned long end;
int scnt;
unsigned long csum;
struct header hdr;
drive&=3;
end = raw + unit[drive].type->read_size;
for (scnt = 0;scnt < unit[drive].sects; scnt++) {
if (!(raw = scan_sync(raw, end))) {
printk ("can't find sync for sector %d\n", 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 %lx\n",
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("MFM_HEADER: %08lx,%08lx\n", hdr.hdrchk, csum);
return MFM_HEADER;
}
/* verify track */
if (hdr.track != track) {
printk("MFM_TRACK: %d, %d\n", hdr.track, track);
return MFM_TRACK;
}
raw = decode ((ulong *)(track_data + hdr.sect*512),
(ulong *)raw, 512);
csum = checksum((ulong *)(track_data + hdr.sect*512), 512);
if (hdr.datachk != csum) {
printk("MFM_DATA: (%x:%d:%d:%d) sc=%d %lx, %lx\n",
hdr.magic, hdr.track, hdr.sect, hdr.ord, scnt,
hdr.datachk, csum);
printk ("data=(%lx,%lx,%lx,%lx)\n",
((ulong *)(track_data+hdr.sect*512))[0],
((ulong *)(track_data+hdr.sect*512))[1],
((ulong *)(track_data+hdr.sect*512))[2],
((ulong *)(track_data+hdr.sect*512))[3]);
return MFM_DATA;
}
}
return 0;
}
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 cost about 3h to discover.... */
unsigned char gap1[22]; /* for longword-alignedness (0x4e) */
};
/* crc routines are borrowed from the messydos-handler */
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 */
}
/* 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 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, %08lx\n",ptr,
((ulong *)ptr)[0],((ulong *)ptr)[1],((ulong *)ptr)[2],((ulong *)ptr)[3]);
}
#endif
/*******************************************************************
this reads a raw track of data into trackbuffer for ms-disks
*******************************************************************/
static int dos_read(int drive, unsigned char *track_data,
unsigned long raw, int track)
{
unsigned long end;
int scnt;
unsigned short crc,data_crc[2];
struct dos_header hdr;
drive&=3;
end = raw + unit[drive].type->read_size;
for (scnt=0;scnt<unit[drive].sects;scnt++) {
do { /* search for the right sync of each sec-hdr */
if (!(raw = scan_sync (raw, end))) {
printk("dos_read: no hdr sync on track %d, unit %d for sector %d\n",
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) %x\n", hdr.track, hdr.side,
hdr.sec, hdr.len_desc, hdr.crc);
#endif
if (crc != hdr.crc) {
printk("dos_read: MFM_HEADER %04x,%04x\n", hdr.crc, crc);
return MFM_HEADER;
}
if (hdr.track != track/unit[drive].type->heads) {
printk("dos_read: MFM_TRACK %d, %d\n", hdr.track,
track/unit[drive].type->heads);
return MFM_TRACK;
}
if (hdr.side != track%unit[drive].type->heads) {
printk("dos_read: MFM_SIDE %d, %d\n", hdr.side,
track%unit[drive].type->heads);
return MFM_TRACK;
}
if (hdr.len_desc != 2) {
printk("dos_read: unknown sector len descriptor %d\n", hdr.len_desc);
return MFM_DATA;
}
#ifdef DEBUG
printk("hdr accepted\n");
#endif
if (!(raw = scan_sync (raw, end))) {
printk("dos_read: no data sync on track %d, unit %d for sector%d, disk sector %d\n",
track, drive, scnt, hdr.sec);
return MFM_NOSYNC;
}
#ifdef DEBUG
dbg(raw);
#endif
if (*((ushort *)raw)!=0x5545) {
printk("dos_read: no data mark after sync (%d,%d,%d,%d) sc=%d\n",
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 *)(track_data + (hdr.sec - 1) * 512), (ushort *) raw, 512);
raw = dos_decode((unsigned char *)data_crc,(ushort *) raw,4);
crc = dos_data_crc(track_data + (hdr.sec - 1) * 512);
if (crc != data_crc[0]) {
printk("dos_read: MFM_DATA (%d,%d,%d,%d) sc=%d, %x %x\n",
hdr.track, hdr.side, hdr.sec, hdr.len_desc,
scnt,data_crc[0], crc);
printk("data=(%lx,%lx,%lx,%lx,...)\n",
((ulong *)(track_data+(hdr.sec-1)*512))[0],
((ulong *)(track_data+(hdr.sec-1)*512))[1],
((ulong *)(track_data+(hdr.sec-1)*512))[2],
((ulong *)(track_data+(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 track, int cnt,
unsigned char *data)
{
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=track/unit[drive].type->heads;
hdr.side=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 *)data,512);
raw+=256;
/*data crc + jd's special gap (long words :-/) */
crc[0]=dos_data_crc(data);
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 */
}
/**************************************************************
builds encoded track data from trackbuffer data
**************************************************************/
static void dos_write(int disk, unsigned long raw, unsigned char *data,
int track)
{
int cnt;
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].sects;cnt++)
ptr=ms_putsec(disk,ptr,track,cnt,data+cnt*512);
*(ushort *)ptr = 0xaaa8; /* MFM word before is always 0x9254 */
}
/*
* 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
/*
* The driver is trying to determine the correct media format
* while probing is set. rw_interrupt() clears it after a
* successful access.
*/
static int probing = 0;
/* Prevent "aliased" accesses. */
static fd_ref[4] = { 0,0,0,0 };
static fd_device[4] = { 0,0,0,0 };
/*
* Current device number. Taken either from the block header or from the
* format request descriptor.
*/
#define CURRENT_DEVICE (CURRENT->rq_dev)
/* Current error count. */
#define CURRENT_ERRORS (CURRENT->errors)
static void request_done(int uptodate)
{
timer_active &= ~(1 << FLOPPY_TIMER);
end_request(uptodate);
}
/*
* 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(kdev_t dev)
{
int drive = dev & 3;
int changed;
if (MAJOR(dev) != MAJOR_NR) {
printk("floppy_change: not a floppy\n");
return 0;
}
fd_select (drive);
changed = !(ciaa.pra & DSKCHANGE);
fd_deselect (drive);
if (changed) {
fd_probe(dev);
unit[drive].track = -1;
selected = -1;
savedtrack = -1;
writepending = 0; /* if this was true before, too bad! */
writefromint = 0;
return 1;
}
return 0;
}
static __inline__ void copy_buffer(void *from, void *to)
{
ulong *p1,*p2;
int cnt;
p1 = (ulong *)from;
p2 = (ulong *)to;
for (cnt = 0; cnt < 512/4; cnt++)
*p2++ = *p1++;
}
static void raw_read(int drive, int track, char *ptrack, int len)
{
drive&=3;
/* setup adkcon bits correctly */
custom.adkcon = ADK_MSBSYNC;
custom.adkcon = ADK_SETCLR|ADK_WORDSYNC|ADK_FAST;
custom.dsksync = MFM_SYNC;
custom.dsklen = 0;
#if 0
ms_delay (unit[drive].type->side_time);
#endif
custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)ptrack);
custom.dsklen = len/sizeof(short) | DSKLEN_DMAEN;
custom.dsklen = len/sizeof(short) | DSKLEN_DMAEN;
block_flag = 1;
while (block_flag == 1)
sleep_on (&wait_fd_block);
custom.dsklen = 0;
}
static int raw_write(int drive, int track, char *ptrack, int len)
{
ushort adk;
drive&=3;
if ((ciaa.pra & DSKPROT) == 0)
return 0;
/* clear adkcon bits */
custom.adkcon = ADK_PRECOMP1|ADK_PRECOMP0|ADK_WORDSYNC|ADK_MSBSYNC;
/* set appropriate adkcon bits */
adk = ADK_SETCLR|ADK_FAST;
if ((ulong)track >= unit[drive].type->precomp2)
adk |= ADK_PRECOMP1;
else if ((ulong)track >= unit[drive].type->precomp1)
adk |= ADK_PRECOMP0;
custom.adkcon = adk;
custom.dsklen = DSKLEN_WRITE;
#if 0
ms_delay (unit[drive].type->side_time);
#endif
custom.dskptr = (u_char *)ZTWO_PADDR((u_char *)ptrack);
custom.dsklen = len/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE;
custom.dsklen = len/sizeof(short) | DSKLEN_DMAEN|DSKLEN_WRITE;
block_flag = 2;
return 1;
}
static void post_write (unsigned long dummy)
{
custom.dsklen = 0;
writepending = 0;
writefromint = 0;
}
static int get_track(int drive, int track)
{
int error;
drive&=3;
if ((lastdrive == drive) && (savedtrack == track))
return 0;
lastdrive = drive;
raw_read(drive, track, raw_buf, unit[drive].type->read_size);
savedtrack = -1;
error = (*unit[drive].dtype->read_fkt)(drive, trackdata, (unsigned long)raw_buf, track);
switch (error) {
case 0:
savedtrack = track;
return 0;
case MFM_TRACK:
unit[drive].track = -1;
/* fall through */
default:
return -1;
}
}
static void flush_track_callback(unsigned long nr)
{
nr&=3;
writefromint = 1;
(*unit[nr].dtype->write_fkt)(nr, (unsigned long)raw_buf, trackdata, savedtrack);
if (!raw_write(nr, savedtrack, raw_buf, unit[nr].type->write_size)) {
printk ("floppy disk write protected\n");
writefromint = 0;
writepending = 0;
}
}
static int non_int_flush_track (unsigned long nr)
{
unsigned long flags;
nr&=3;
writefromint = 0;
del_timer(&post_write_timer);
save_flags(flags);
cli();
if (writepending != 2) {
restore_flags(flags);
(*unit[nr].dtype->write_fkt)(nr, (unsigned long)raw_buf, trackdata, savedtrack);
if (!raw_write(nr, savedtrack, raw_buf, unit[nr].type->write_size)) {
printk ("floppy disk write protected in write!\n");
writepending = 0;
return 0;
}
while (block_flag == 2)
sleep_on (&wait_fd_block);
}
else
restore_flags(flags);
ms_delay(2); /* 2 ms post_write delay */
post_write(0);
return 1;
}
static void redo_fd_request(void)
{
unsigned int block, track, sector;
int device, drive, cnt;
struct amiga_floppy_struct *floppy;
char *data;
unsigned long flags;
if (CURRENT && CURRENT->rq_status == RQ_INACTIVE){
return;
}
repeat:
if (!CURRENT) {
if (!fdc_busy)
printk("FDC access conflict!");
fdc_busy = 0;
wake_up(&fdc_wait);
CLEAR_INTR;
return;
}
if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
panic(DEVICE_NAME ": request list destroyed");
if (CURRENT->bh && !buffer_locked(CURRENT->bh))
panic(DEVICE_NAME ": block not locked");
probing = 0;
device = MINOR(CURRENT_DEVICE);
if (device > 3) {
/* manual selection */
drive = device & 3;
floppy = unit + drive;
} else {
/* Auto-detection */
/* printk("redo_fd_request: can't handle auto detect\n");*/
/* printk("redo_fd_request: default to normal\n");*/
drive = device & 3;
floppy = unit + drive;
}
save_flags (flags);
cli();
if (drive != selected && writepending) {
del_timer (&flush_track_timer);
restore_flags (flags);
if (!non_int_flush_track (selected)) {
end_request(0);
goto repeat;
}
} else
restore_flags (flags);
/* Here someone could investigate to be more efficient */
for (cnt = 0; cnt < CURRENT->current_nr_sectors; cnt++) {
#ifdef DEBUG
printk("fd: sector %d + %d requested\n",CURRENT->sector,cnt);
#endif
block = CURRENT->sector + cnt;
if ((int)block > floppy->blocks) {
request_done(0);
goto repeat;
}
track = block / floppy->sects;
sector = block % floppy->sects;
data = CURRENT->buffer + 512 * cnt;
save_flags (flags);
cli();
if (track != savedtrack && writepending) {
del_timer (&flush_track_timer);
restore_flags (flags);
if (!non_int_flush_track (selected)) {
end_request(0);
goto repeat;
}
} else
restore_flags (flags);
switch (CURRENT->cmd) {
case READ:
if (!motor_on (drive)) {
end_request(0);
goto repeat;
}
fd_select (drive);
if (!fd_seek(drive, track)) {
end_request(0);
goto repeat;
}
if (get_track(drive, track) == -1) {
end_request(0);
goto repeat;
}
copy_buffer(trackdata + sector * 512, data);
break;
case WRITE:
if (!motor_on (drive)) {
end_request(0);
goto repeat;
}
fd_select (drive);
if (!fd_seek(drive, track)) {
end_request(0);
goto repeat;
}
if (get_track(drive, track) == -1) {
end_request(0);
goto repeat;
}
copy_buffer(data, trackdata + sector * 512);
/*
* setup a callback to write the track buffer
* after a short (1 tick) delay.
*/
save_flags (flags);
cli();
if (writepending)
/* reset the timer */
del_timer (&flush_track_timer);
writepending = 1;
flush_track_timer.data = drive;
flush_track_timer.expires = jiffies + 1;
add_timer (&flush_track_timer);
restore_flags (flags);
break;
default:
printk("do_fd_request: unknown command\n");
request_done(0);
goto repeat;
}
}
CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
CURRENT->sector += CURRENT->current_nr_sectors;
request_done(1);
goto repeat;
}
static void do_fd_request(void)
{
unsigned long flags;
save_flags(flags);
cli();
while (fdc_busy) sleep_on(&fdc_wait);
fdc_busy = 1;
restore_flags(flags); /* sti(); */
redo_fd_request();
}
static int fd_ioctl(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long param)
{
int drive = inode->i_rdev & 3;
static struct floppy_struct getprm;
int error;
switch(cmd)
{
case FDFMTBEG:
if (fd_ref[drive] > 1)
return -EBUSY;
fsync_dev(inode->i_rdev);
if (motor_on(drive) == 0)
return -ENODEV;
if (fd_calibrate(drive) == 0)
return -ENXIO;
floppy_off(drive);
break;
case FDFMTTRK:
if (param < unit[drive].type->tracks)
{
fd_select(drive);
if (fd_seek(drive,param)!=0)
{
savedtrack=param;
memset(trackdata,FD_FILL_BYTE,unit[drive].sects*512);
non_int_flush_track(drive);
}
floppy_off(drive);
}
else
return -EINVAL;
break;
case FDFMTEND:
floppy_off(drive);
invalidate_inodes(inode->i_rdev);
invalidate_buffers(inode->i_rdev);
break;
case FDGETPRM:
error = verify_area(VERIFY_WRITE, (void *)param,
sizeof(struct floppy_struct));
if (error)
return error;
memset((void *)&getprm, 0, sizeof (getprm));
getprm.track=unit[drive].type->tracks/unit[drive].type->heads;
getprm.head=unit[drive].type->heads;
getprm.sect=unit[drive].sects;
getprm.size=unit[drive].blocks;
memcpy_tofs((void *)param,(void *)&getprm,sizeof(struct floppy_struct));
break;
case BLKGETSIZE:
error = verify_area(VERIFY_WRITE, (void *)param,
sizeof(long));
if (error)
return error;
put_fs_long(unit[drive].blocks,(long *)param);
break;
case FDSETPRM:
case FDDEFPRM:
return -EINVAL;
case FDFLUSH:
if ((drive == selected) && (writepending)) {
del_timer (&flush_track_timer);
non_int_flush_track(selected);
}
break;
#ifdef RAW_IOCTL
case IOCTL_RAW_TRACK:
error = verify_area(VERIFY_WRITE, (void *)param,
unit[drive].type->read_size);
if (error)
return error;
memcpy_tofs((void *)param, raw_buf, unit[drive].type->read_size);
return unit[drive].type->read_size;
#endif
default:
printk("fd_ioctl: unknown cmd %d for drive %d.",cmd,drive);
return -ENOSYS;
}
return 0;
}
/*======================================================================
Return unit ID number of given disk
======================================================================*/
static unsigned long get_drive_id(int drive)
{
int i;
ulong id = 0;
drive&=3;
/* 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));
}
selected = -1;
/*
* 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("fd: drive 0 didn't identify, setting default %08lx\n",(ulong)fd_def_df0);
}
/* return the ID value */
return (id);
}
static void fd_probe(int dev)
{
unsigned long code;
int type;
int drive;
int system;
drive = dev & 3;
code = get_drive_id(drive);
/* get drive type */
unit[drive].type = NULL;
for (type = 0; type < num_dr_types; type++)
if (drive_types[type].code == code)
break;
if (type >= num_dr_types) {
printk("fd_probe: unsupported drive type %08lx found\n",
code);
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;
system=(dev & 4)>>2;
unit[drive].dtype=&data_types[system];
unit[drive].sects=data_types[system].sects*unit[drive].type->sect_mult;
unit[drive].blocks=unit[drive].type->heads*unit[drive].type->tracks*
unit[drive].sects;
floppy_sizes[MINOR(dev)] = unit[drive].blocks >> 1;
}
static void probe_drives(void)
{
int drive,found;
printk("FD: probing units\nfound ");
found=0;
for(drive=0;drive<FD_MAX_UNITS;drive++) {
fd_probe(drive);
if (unit[drive].type->code != FD_NODRIVE) {
printk("fd%d ",drive);
found=1;
}
}
printk("%s\n",(found==0)?" no drives":"");
}
/*
* floppy_open check for aliasing (/dev/fd0 can be the same as
* /dev/PS0 etc), and disallows simultaneous access to the same
* drive with different device numbers.
*/
static int floppy_open(struct inode *inode, struct file *filp)
{
int drive;
int old_dev;
int system;
drive = inode->i_rdev & 3;
old_dev = fd_device[drive];
if (fd_ref[drive])
if (old_dev != inode->i_rdev)
return -EBUSY;
if (unit[drive].type->code == FD_NODRIVE)
return -ENODEV;
fd_ref[drive]++;
fd_device[drive] = inode->i_rdev;
if (old_dev && old_dev != inode->i_rdev)
invalidate_buffers(old_dev);
if (filp && filp->f_mode)
check_disk_change(inode->i_rdev);
if (filp && (filp->f_flags & (O_WRONLY|O_RDWR))) {
int wrprot;
fd_select (drive);
wrprot = !(ciaa.pra & DSKPROT);
fd_deselect (drive);
if (wrprot)
return -EROFS;
}
system=(inode->i_rdev & 4)>>2;
unit[drive].dtype=&data_types[system];
unit[drive].sects=data_types[system].sects*unit[drive].type->sect_mult;
unit[drive].blocks=unit[drive].type->heads*unit[drive].type->tracks*
unit[drive].sects;
printk("fd%d: accessing %s-disk with %s-layout\n",drive,unit[drive].type->name,
data_types[system].name);
return 0;
}
static void floppy_release(struct inode * inode, struct file * filp)
{
unsigned long flags;
fsync_dev(inode->i_rdev);
invalidate_inodes(inode->i_rdev);
invalidate_buffers(inode->i_rdev);
save_flags (flags);
cli();
if ((inode->i_rdev & 3) == selected && writepending) {
del_timer (&flush_track_timer);
restore_flags (flags);
non_int_flush_track (selected);
} else
restore_flags (flags);
if (!fd_ref[inode->i_rdev & 3]--) {
printk("floppy_release with fd_ref == 0");
fd_ref[inode->i_rdev & 3] = 0;
}
}
void amiga_floppy_setup (char *str, int *ints)
{
printk ("amiflop: Setting default df0 to %x\n", ints[1]);
fd_def_df0 = ints[1];
}
static struct file_operations floppy_fops = {
NULL, /* lseek - default */
block_read, /* read - general block-dev read */
block_write, /* write - general block-dev write */
NULL, /* readdir - bad */
NULL, /* select */
fd_ioctl, /* ioctl */
NULL, /* mmap */
floppy_open, /* open */
floppy_release, /* release */
block_fsync, /* fsync */
NULL, /* fasync */
amiga_floppy_change, /* check_media_change */
NULL, /* revalidate */
};
static void fd_block_done(int irq, struct pt_regs *fp, void *dummy)
{
if (block_flag)
custom.dsklen = 0x4000;
block_flag = 0;
wake_up (&wait_fd_block);
if (writefromint) {
/*
* if it was a write from an interrupt,
* we will call post_write from here
*/
writepending = 2;
post_write_timer.expires = 1; /* at least 2 ms */
add_timer(&post_write_timer);
}
}
int amiga_floppy_init(void)
{
int i;
if (!AMIGAHW_PRESENT(AMI_FLOPPY))
return -ENXIO;
if (register_blkdev(MAJOR_NR,"fd",&floppy_fops)) {
printk("Unable to get major %d for floppy\n",MAJOR_NR);
return -EBUSY;
}
/* initialize variables */
motor_on_timer.next = NULL;
motor_on_timer.prev = NULL;
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++) {
motor_off_timer[i].next = NULL;
motor_off_timer[i].prev = NULL;
motor_off_timer[i].expires = 0;
motor_off_timer[i].data = i;
motor_off_timer[i].function = fd_motor_off;
unit[i].track = -1;
}
flush_track_timer.next = NULL;
flush_track_timer.prev = NULL;
flush_track_timer.expires = 0;
flush_track_timer.data = 0;
flush_track_timer.function = flush_track_callback;
post_write_timer.next = NULL;
post_write_timer.prev = NULL;
post_write_timer.expires = 0;
post_write_timer.data = 0;
post_write_timer.function = post_write;
blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
blksize_size[MAJOR_NR] = floppy_blocksizes;
blk_size[MAJOR_NR] = floppy_sizes;
timer_table[FLOPPY_TIMER].fn = NULL;
timer_active &= ~(1 << FLOPPY_TIMER);
if (fd_def_df0==0) {
if ((boot_info.bi_amiga.model == AMI_3000) ||
(boot_info.bi_amiga.model == AMI_4000))
fd_def_df0=FD_HD_3;
else
fd_def_df0=FD_DD_3;
}
probe_drives();
raw_buf = (char *)amiga_chip_alloc (RAW_BUF_SIZE);
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;
add_isr(IRQ_FLOPPY, fd_block_done, 0, NULL, "floppy_dma");
add_isr(IRQ_AMIGA_CIAA_TB, ms_isr, 0, NULL, "floppy_timer");
return 0;
}
