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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [drivers/] [block/] [amiflop.c] - Rev 1772
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/* * 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; }
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