1884 lines
46 KiB
C
1884 lines
46 KiB
C
/*
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* linux/amiga/amiflop.c
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*
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* Copyright (C) 1993 Greg Harp
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* Portions of this driver are based on code contributed by Brad Pepers
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*
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* revised 28.5.95 by Joerg Dorchain
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* - now no bugs(?) any more for both HD & DD
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* - added support for 40 Track 5.25" drives, 80-track hopefully behaves
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* like 3.5" dd (no way to test - are there any 5.25" drives out there
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* that work on an A4000?)
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* - wrote formatting routine (maybe dirty, but works)
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*
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* june/july 1995 added ms-dos support by Joerg Dorchain
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* (portions based on messydos.device and various contributors)
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* - currently only 9 and 18 sector disks
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*
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* - fixed a bug with the internal trackbuffer when using multiple
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* disks the same time
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* - made formatting a bit safer
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* - added command line and machine based default for "silent" df0
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*
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* december 1995 adapted for 1.2.13pl4 by Joerg Dorchain
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* - works but I think it's inefficient. (look in redo_fd_request)
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* But the changes were very efficient. (only three and a half lines)
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*
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* january 1996 added special ioctl for tracking down read/write problems
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* - usage ioctl(d, RAW_TRACK, ptr); the raw track buffer (MFM-encoded data
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* is copied to area. (area should be large enough since no checking is
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* done - 30K is currently sufficient). return the actual size of the
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* trackbuffer
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* - replaced udelays() by a timer (CIAA timer B) for the waits
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* needed for the disk mechanic.
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*
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* february 1996 fixed error recovery and multiple disk access
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* - both got broken the first time I tampered with the driver :-(
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* - still not safe, but better than before
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*
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* revised Marts 3rd, 1996 by Jes Sorensen for use in the 1.3.28 kernel.
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* - Minor changes to accept the kdev_t.
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* - Replaced some more udelays with ms_delays. Udelay is just a loop,
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* and so the delay will be different depending on the given
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* processor :-(
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* - The driver could use a major cleanup because of the new
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* major/minor handling that came with kdev_t. It seems to work for
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* the time being, but I can't guarantee that it will stay like
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* that when we start using 16 (24?) bit minors.
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*
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* restructured jan 1997 by Joerg Dorchain
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* - Fixed Bug accessing multiple disks
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* - some code cleanup
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* - added trackbuffer for each drive to speed things up
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* - fixed some race conditions (who finds the next may send it to me ;-)
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/fd.h>
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#include <linux/hdreg.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/mutex.h>
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#include <linux/amifdreg.h>
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#include <linux/amifd.h>
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#include <linux/fs.h>
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#include <linux/blkdev.h>
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#include <linux/elevator.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <asm/setup.h>
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#include <linux/uaccess.h>
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#include <asm/amigahw.h>
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#include <asm/amigaints.h>
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#include <asm/irq.h>
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#undef DEBUG /* print _LOTS_ of infos */
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#define RAW_IOCTL
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#ifdef RAW_IOCTL
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#define IOCTL_RAW_TRACK 0x5254524B /* 'RTRK' */
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#endif
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/*
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* Defines
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*/
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/*
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* Error codes
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*/
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#define FD_OK 0 /* operation succeeded */
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#define FD_ERROR -1 /* general error (seek, read, write, etc) */
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#define FD_NOUNIT 1 /* unit does not exist */
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#define FD_UNITBUSY 2 /* unit already active */
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#define FD_NOTACTIVE 3 /* unit is not active */
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#define FD_NOTREADY 4 /* unit is not ready (motor not on/no disk) */
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#define MFM_NOSYNC 1
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#define MFM_HEADER 2
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#define MFM_DATA 3
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#define MFM_TRACK 4
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/*
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* Floppy ID values
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*/
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#define FD_NODRIVE 0x00000000 /* response when no unit is present */
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#define FD_DD_3 0xffffffff /* double-density 3.5" (880K) drive */
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#define FD_HD_3 0x55555555 /* high-density 3.5" (1760K) drive */
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#define FD_DD_5 0xaaaaaaaa /* double-density 5.25" (440K) drive */
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static DEFINE_MUTEX(amiflop_mutex);
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static unsigned long int fd_def_df0 = FD_DD_3; /* default for df0 if it doesn't identify */
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module_param(fd_def_df0, ulong, 0);
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MODULE_LICENSE("GPL");
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/*
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* Macros
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*/
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#define MOTOR_ON (ciab.prb &= ~DSKMOTOR)
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#define MOTOR_OFF (ciab.prb |= DSKMOTOR)
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#define SELECT(mask) (ciab.prb &= ~mask)
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#define DESELECT(mask) (ciab.prb |= mask)
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#define SELMASK(drive) (1 << (3 + (drive & 3)))
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static struct fd_drive_type drive_types[] = {
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/* code name tr he rdsz wrsz sm pc1 pc2 sd st st*/
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/* warning: times are now in milliseconds (ms) */
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{ FD_DD_3, "DD 3.5", 80, 2, 14716, 13630, 1, 80,161, 3, 18, 1},
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{ FD_HD_3, "HD 3.5", 80, 2, 28344, 27258, 2, 80,161, 3, 18, 1},
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{ FD_DD_5, "DD 5.25", 40, 2, 14716, 13630, 1, 40, 81, 6, 30, 2},
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{ FD_NODRIVE, "No Drive", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
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};
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static int num_dr_types = ARRAY_SIZE(drive_types);
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static int amiga_read(int), dos_read(int);
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static void amiga_write(int), dos_write(int);
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static struct fd_data_type data_types[] = {
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{ "Amiga", 11 , amiga_read, amiga_write},
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{ "MS-Dos", 9, dos_read, dos_write}
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};
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/* current info on each unit */
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static struct amiga_floppy_struct unit[FD_MAX_UNITS];
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static struct timer_list flush_track_timer[FD_MAX_UNITS];
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static struct timer_list post_write_timer;
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static unsigned long post_write_timer_drive;
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static struct timer_list motor_on_timer;
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static struct timer_list motor_off_timer[FD_MAX_UNITS];
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static int on_attempts;
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/* Synchronization of FDC access */
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/* request loop (trackbuffer) */
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static volatile int fdc_busy = -1;
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static volatile int fdc_nested;
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static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
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static DECLARE_COMPLETION(motor_on_completion);
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static volatile int selected = -1; /* currently selected drive */
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static int writepending;
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static int writefromint;
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static char *raw_buf;
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static int fdc_queue;
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static DEFINE_SPINLOCK(amiflop_lock);
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#define RAW_BUF_SIZE 30000 /* size of raw disk data */
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/*
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* These are global variables, as that's the easiest way to give
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* information to interrupts. They are the data used for the current
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* request.
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*/
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static volatile char block_flag;
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static DECLARE_WAIT_QUEUE_HEAD(wait_fd_block);
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/* MS-Dos MFM Coding tables (should go quick and easy) */
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static unsigned char mfmencode[16]={
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0x2a, 0x29, 0x24, 0x25, 0x12, 0x11, 0x14, 0x15,
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0x4a, 0x49, 0x44, 0x45, 0x52, 0x51, 0x54, 0x55
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};
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static unsigned char mfmdecode[128];
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/* floppy internal millisecond timer stuff */
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static DECLARE_COMPLETION(ms_wait_completion);
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#define MS_TICKS ((amiga_eclock+50)/1000)
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/*
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* Note that MAX_ERRORS=X doesn't imply that we retry every bad read
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* max X times - some types of errors increase the errorcount by 2 or
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* even 3, so we might actually retry only X/2 times before giving up.
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*/
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#define MAX_ERRORS 12
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#define custom amiga_custom
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/* Prevent "aliased" accesses. */
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static int fd_ref[4] = { 0,0,0,0 };
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static int fd_device[4] = { 0, 0, 0, 0 };
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/*
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* Here come the actual hardware access and helper functions.
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* They are not reentrant and single threaded because all drives
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* share the same hardware and the same trackbuffer.
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*/
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/* Milliseconds timer */
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static irqreturn_t ms_isr(int irq, void *dummy)
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{
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complete(&ms_wait_completion);
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return IRQ_HANDLED;
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}
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/* all waits are queued up
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A more generic routine would do a schedule a la timer.device */
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static void ms_delay(int ms)
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{
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int ticks;
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static DEFINE_MUTEX(mutex);
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if (ms > 0) {
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mutex_lock(&mutex);
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ticks = MS_TICKS*ms-1;
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ciaa.tblo=ticks%256;
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ciaa.tbhi=ticks/256;
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ciaa.crb=0x19; /*count eclock, force load, one-shoot, start */
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wait_for_completion(&ms_wait_completion);
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mutex_unlock(&mutex);
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}
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}
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/* Hardware semaphore */
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/* returns true when we would get the semaphore */
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static inline int try_fdc(int drive)
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{
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drive &= 3;
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return ((fdc_busy < 0) || (fdc_busy == drive));
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}
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static void get_fdc(int drive)
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{
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unsigned long flags;
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drive &= 3;
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#ifdef DEBUG
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printk("get_fdc: drive %d fdc_busy %d fdc_nested %d\n",drive,fdc_busy,fdc_nested);
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#endif
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local_irq_save(flags);
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wait_event(fdc_wait, try_fdc(drive));
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fdc_busy = drive;
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fdc_nested++;
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local_irq_restore(flags);
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}
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static inline void rel_fdc(void)
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{
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#ifdef DEBUG
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if (fdc_nested == 0)
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printk("fd: unmatched rel_fdc\n");
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printk("rel_fdc: fdc_busy %d fdc_nested %d\n",fdc_busy,fdc_nested);
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#endif
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fdc_nested--;
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if (fdc_nested == 0) {
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fdc_busy = -1;
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wake_up(&fdc_wait);
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}
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}
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static void fd_select (int drive)
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{
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unsigned char prb = ~0;
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drive&=3;
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#ifdef DEBUG
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printk("selecting %d\n",drive);
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#endif
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if (drive == selected)
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return;
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get_fdc(drive);
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selected = drive;
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if (unit[drive].track % 2 != 0)
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prb &= ~DSKSIDE;
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if (unit[drive].motor == 1)
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prb &= ~DSKMOTOR;
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ciab.prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
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ciab.prb = prb;
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prb &= ~SELMASK(drive);
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ciab.prb = prb;
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rel_fdc();
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}
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static void fd_deselect (int drive)
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{
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unsigned char prb;
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unsigned long flags;
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drive&=3;
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#ifdef DEBUG
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printk("deselecting %d\n",drive);
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#endif
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if (drive != selected) {
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printk(KERN_WARNING "Deselecting drive %d while %d was selected!\n",drive,selected);
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return;
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}
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get_fdc(drive);
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local_irq_save(flags);
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selected = -1;
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prb = ciab.prb;
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prb |= (SELMASK(0)|SELMASK(1)|SELMASK(2)|SELMASK(3));
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ciab.prb = prb;
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local_irq_restore (flags);
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rel_fdc();
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}
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static void motor_on_callback(struct timer_list *unused)
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{
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if (!(ciaa.pra & DSKRDY) || --on_attempts == 0) {
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complete_all(&motor_on_completion);
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} else {
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motor_on_timer.expires = jiffies + HZ/10;
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add_timer(&motor_on_timer);
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}
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}
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static int fd_motor_on(int nr)
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{
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nr &= 3;
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del_timer(motor_off_timer + nr);
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if (!unit[nr].motor) {
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unit[nr].motor = 1;
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fd_select(nr);
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reinit_completion(&motor_on_completion);
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mod_timer(&motor_on_timer, jiffies + HZ/2);
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on_attempts = 10;
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wait_for_completion(&motor_on_completion);
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fd_deselect(nr);
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}
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if (on_attempts == 0) {
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on_attempts = -1;
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#if 0
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printk (KERN_ERR "motor_on failed, turning motor off\n");
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fd_motor_off (motor_off_timer + nr);
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return 0;
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#else
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printk (KERN_WARNING "DSKRDY not set after 1.5 seconds - assuming drive is spinning notwithstanding\n");
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#endif
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}
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return 1;
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}
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static void fd_motor_off(struct timer_list *timer)
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{
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unsigned long drive = ((unsigned long)timer -
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(unsigned long)&motor_off_timer[0]) /
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sizeof(motor_off_timer[0]);
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drive&=3;
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if (!try_fdc(drive)) {
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/* We would be blocked in an interrupt, so try again later */
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timer->expires = jiffies + 1;
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add_timer(timer);
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return;
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}
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unit[drive].motor = 0;
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fd_select(drive);
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udelay (1);
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fd_deselect(drive);
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}
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static void floppy_off (unsigned int nr)
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{
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int drive;
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drive = nr & 3;
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mod_timer(motor_off_timer + drive, jiffies + 3*HZ);
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}
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static int fd_calibrate(int drive)
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{
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unsigned char prb;
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int n;
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drive &= 3;
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get_fdc(drive);
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if (!fd_motor_on (drive))
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return 0;
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fd_select (drive);
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prb = ciab.prb;
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prb |= DSKSIDE;
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prb &= ~DSKDIREC;
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ciab.prb = prb;
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for (n = unit[drive].type->tracks/2; n != 0; --n) {
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if (ciaa.pra & DSKTRACK0)
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break;
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prb &= ~DSKSTEP;
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ciab.prb = prb;
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prb |= DSKSTEP;
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udelay (2);
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ciab.prb = prb;
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ms_delay(unit[drive].type->step_delay);
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}
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ms_delay (unit[drive].type->settle_time);
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prb |= DSKDIREC;
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n = unit[drive].type->tracks + 20;
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for (;;) {
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prb &= ~DSKSTEP;
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ciab.prb = prb;
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prb |= DSKSTEP;
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udelay (2);
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ciab.prb = prb;
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ms_delay(unit[drive].type->step_delay + 1);
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if ((ciaa.pra & DSKTRACK0) == 0)
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break;
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if (--n == 0) {
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printk (KERN_ERR "fd%d: calibrate failed, turning motor off\n", drive);
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fd_motor_off (motor_off_timer + drive);
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unit[drive].track = -1;
|
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rel_fdc();
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return 0;
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}
|
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}
|
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unit[drive].track = 0;
|
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ms_delay(unit[drive].type->settle_time);
|
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|
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rel_fdc();
|
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fd_deselect(drive);
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return 1;
|
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}
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|
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static int fd_seek(int drive, int track)
|
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{
|
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unsigned char prb;
|
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int cnt;
|
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|
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#ifdef DEBUG
|
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printk("seeking drive %d to track %d\n",drive,track);
|
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#endif
|
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drive &= 3;
|
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get_fdc(drive);
|
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if (unit[drive].track == track) {
|
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rel_fdc();
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return 1;
|
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}
|
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if (!fd_motor_on(drive)) {
|
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rel_fdc();
|
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return 0;
|
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}
|
|
if (unit[drive].track < 0 && !fd_calibrate(drive)) {
|
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rel_fdc();
|
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return 0;
|
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}
|
|
|
|
fd_select (drive);
|
|
cnt = unit[drive].track/2 - track/2;
|
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prb = ciab.prb;
|
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prb |= DSKSIDE | DSKDIREC;
|
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if (track % 2 != 0)
|
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prb &= ~DSKSIDE;
|
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if (cnt < 0) {
|
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cnt = - cnt;
|
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prb &= ~DSKDIREC;
|
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}
|
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ciab.prb = prb;
|
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if (track % 2 != unit[drive].track % 2)
|
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ms_delay (unit[drive].type->side_time);
|
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unit[drive].track = track;
|
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if (cnt == 0) {
|
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rel_fdc();
|
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fd_deselect(drive);
|
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return 1;
|
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}
|
|
do {
|
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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);
|
|
|
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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 %08lx\n", (ulong)fd_def_df0);
|
|
}
|
|
/* return the ID value */
|
|
return (id);
|
|
}
|
|
|
|
static irqreturn_t fd_block_done(int irq, void *dummy)
|
|
{
|
|
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_drive = 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);
|
|
wait_event(wait_fd_block, !block_flag);
|
|
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;
|
|
|
|
wait_event(wait_fd_block, !block_flag);
|
|
|
|
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;
|
|
}
|
|
wait_event(wait_fd_block, !block_flag);
|
|
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 %ld\n",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 */
|
|
}
|
|
|
|
static void post_write_callback(struct timer_list *timer)
|
|
{
|
|
post_write(post_write_timer_drive);
|
|
}
|
|
|
|
/*
|
|
* 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 %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(KERN_INFO "MFM_HEADER: %08lx,%08lx\n", hdr.hdrchk, csum);
|
|
return MFM_HEADER;
|
|
}
|
|
|
|
/* verify track */
|
|
if (hdr.track != unit[drive].track) {
|
|
printk(KERN_INFO "MFM_TRACK: %d, %d\n", 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, %lx\n",
|
|
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, %08lx\n", 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 %d\n",
|
|
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) %x\n", hdr.track, hdr.side,
|
|
hdr.sec, hdr.len_desc, hdr.crc);
|
|
#endif
|
|
|
|
if (crc != hdr.crc) {
|
|
printk(KERN_INFO "dos_read: MFM_HEADER %04x,%04x\n",
|
|
hdr.crc, crc);
|
|
return MFM_HEADER;
|
|
}
|
|
if (hdr.track != unit[drive].track/unit[drive].type->heads) {
|
|
printk(KERN_INFO "dos_read: MFM_TRACK %d, %d\n",
|
|
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, %d\n",
|
|
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 %d\n", hdr.len_desc);
|
|
return MFM_DATA;
|
|
}
|
|
#ifdef DEBUG
|
|
printk("hdr accepted\n");
|
|
#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 %d\n",
|
|
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=%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 *)(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 %x\n", 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(struct timer_list *timer)
|
|
{
|
|
unsigned long nr = ((unsigned long)timer -
|
|
(unsigned long)&flush_track_timer[0]) /
|
|
sizeof(flush_track_timer[0]);
|
|
|
|
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 protected\n");
|
|
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;
|
|
}
|
|
wait_event(wait_fd_block, block_flag != 2);
|
|
}
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Round-robin between our available drives, doing one request from each
|
|
*/
|
|
static struct request *set_next_request(void)
|
|
{
|
|
struct request_queue *q;
|
|
int cnt = FD_MAX_UNITS;
|
|
struct request *rq = NULL;
|
|
|
|
/* Find next queue we can dispatch from */
|
|
fdc_queue = fdc_queue + 1;
|
|
if (fdc_queue == FD_MAX_UNITS)
|
|
fdc_queue = 0;
|
|
|
|
for(cnt = FD_MAX_UNITS; cnt > 0; cnt--) {
|
|
|
|
if (unit[fdc_queue].type->code == FD_NODRIVE) {
|
|
if (++fdc_queue == FD_MAX_UNITS)
|
|
fdc_queue = 0;
|
|
continue;
|
|
}
|
|
|
|
q = unit[fdc_queue].gendisk->queue;
|
|
if (q) {
|
|
rq = blk_fetch_request(q);
|
|
if (rq)
|
|
break;
|
|
}
|
|
|
|
if (++fdc_queue == FD_MAX_UNITS)
|
|
fdc_queue = 0;
|
|
}
|
|
|
|
return rq;
|
|
}
|
|
|
|
static void redo_fd_request(void)
|
|
{
|
|
struct request *rq;
|
|
unsigned int cnt, block, track, sector;
|
|
int drive;
|
|
struct amiga_floppy_struct *floppy;
|
|
char *data;
|
|
unsigned long flags;
|
|
blk_status_t err;
|
|
|
|
next_req:
|
|
rq = set_next_request();
|
|
if (!rq) {
|
|
/* Nothing left to do */
|
|
return;
|
|
}
|
|
|
|
floppy = rq->rq_disk->private_data;
|
|
drive = floppy - unit;
|
|
|
|
next_segment:
|
|
/* Here someone could investigate to be more efficient */
|
|
for (cnt = 0, err = BLK_STS_OK; cnt < blk_rq_cur_sectors(rq); cnt++) {
|
|
#ifdef DEBUG
|
|
printk("fd: sector %ld + %d requested for %s\n",
|
|
blk_rq_pos(rq), cnt,
|
|
(rq_data_dir(rq) == READ) ? "read" : "write");
|
|
#endif
|
|
block = blk_rq_pos(rq) + cnt;
|
|
if ((int)block > floppy->blocks) {
|
|
err = BLK_STS_IOERR;
|
|
break;
|
|
}
|
|
|
|
track = block / (floppy->dtype->sects * floppy->type->sect_mult);
|
|
sector = block % (floppy->dtype->sects * floppy->type->sect_mult);
|
|
data = bio_data(rq->bio) + 512 * cnt;
|
|
#ifdef DEBUG
|
|
printk("access to track %d, sector %d, with buffer at "
|
|
"0x%08lx\n", track, sector, data);
|
|
#endif
|
|
|
|
if (get_track(drive, track) == -1) {
|
|
err = BLK_STS_IOERR;
|
|
break;
|
|
}
|
|
|
|
if (rq_data_dir(rq) == READ) {
|
|
memcpy(data, floppy->trackbuf + sector * 512, 512);
|
|
} else {
|
|
memcpy(floppy->trackbuf + sector * 512, data, 512);
|
|
|
|
/* keep the drive spinning while writes are scheduled */
|
|
if (!fd_motor_on(drive)) {
|
|
err = BLK_STS_IOERR;
|
|
break;
|
|
}
|
|
/*
|
|
* 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);
|
|
}
|
|
}
|
|
|
|
if (__blk_end_request_cur(rq, err))
|
|
goto next_segment;
|
|
goto next_req;
|
|
}
|
|
|
|
static void do_fd_request(struct request_queue * q)
|
|
{
|
|
redo_fd_request();
|
|
}
|
|
|
|
static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
|
|
{
|
|
int drive = MINOR(bdev->bd_dev) & 3;
|
|
|
|
geo->heads = unit[drive].type->heads;
|
|
geo->sectors = unit[drive].dtype->sects * unit[drive].type->sect_mult;
|
|
geo->cylinders = unit[drive].type->tracks;
|
|
return 0;
|
|
}
|
|
|
|
static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode,
|
|
unsigned int cmd, unsigned long param)
|
|
{
|
|
struct amiga_floppy_struct *p = bdev->bd_disk->private_data;
|
|
int drive = p - unit;
|
|
static struct floppy_struct getprm;
|
|
void __user *argp = (void __user *)param;
|
|
|
|
switch(cmd){
|
|
case FDFMTBEG:
|
|
get_fdc(drive);
|
|
if (fd_ref[drive] > 1) {
|
|
rel_fdc();
|
|
return -EBUSY;
|
|
}
|
|
fsync_bdev(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 < p->type->tracks * p->type->heads)
|
|
{
|
|
get_fdc(drive);
|
|
if (fd_seek(drive,param) != 0){
|
|
memset(p->trackbuf, FD_FILL_BYTE,
|
|
p->dtype->sects * p->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(bdev);
|
|
break;
|
|
case FDGETPRM:
|
|
memset((void *)&getprm, 0, sizeof (getprm));
|
|
getprm.track=p->type->tracks;
|
|
getprm.head=p->type->heads;
|
|
getprm.sect=p->dtype->sects * p->type->sect_mult;
|
|
getprm.size=p->blocks;
|
|
if (copy_to_user(argp, &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(argp, raw_buf, p->type->read_size))
|
|
return -EFAULT;
|
|
else
|
|
return p->type->read_size;
|
|
#endif
|
|
default:
|
|
printk(KERN_DEBUG "fd_ioctl: unknown cmd %d for drive %d.",
|
|
cmd, drive);
|
|
return -ENOSYS;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int fd_ioctl(struct block_device *bdev, fmode_t mode,
|
|
unsigned int cmd, unsigned long param)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&amiflop_mutex);
|
|
ret = fd_locked_ioctl(bdev, mode, cmd, param);
|
|
mutex_unlock(&amiflop_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
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 found\n", 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 block_device *bdev, fmode_t mode)
|
|
{
|
|
int drive = MINOR(bdev->bd_dev) & 3;
|
|
int system = (MINOR(bdev->bd_dev) & 4) >> 2;
|
|
int old_dev;
|
|
unsigned long flags;
|
|
|
|
mutex_lock(&amiflop_mutex);
|
|
old_dev = fd_device[drive];
|
|
|
|
if (fd_ref[drive] && old_dev != system) {
|
|
mutex_unlock(&amiflop_mutex);
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (mode & (FMODE_READ|FMODE_WRITE)) {
|
|
check_disk_change(bdev);
|
|
if (mode & FMODE_WRITE) {
|
|
int wrprot;
|
|
|
|
get_fdc(drive);
|
|
fd_select (drive);
|
|
wrprot = !(ciaa.pra & DSKPROT);
|
|
fd_deselect (drive);
|
|
rel_fdc();
|
|
|
|
if (wrprot) {
|
|
mutex_unlock(&amiflop_mutex);
|
|
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-layout\n",drive,
|
|
unit[drive].type->name, data_types[system].name);
|
|
|
|
mutex_unlock(&amiflop_mutex);
|
|
return 0;
|
|
}
|
|
|
|
static void floppy_release(struct gendisk *disk, fmode_t mode)
|
|
{
|
|
struct amiga_floppy_struct *p = disk->private_data;
|
|
int drive = p - unit;
|
|
|
|
mutex_lock(&amiflop_mutex);
|
|
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
|
|
floppy_off (drive);
|
|
#endif
|
|
mutex_unlock(&amiflop_mutex);
|
|
}
|
|
|
|
/*
|
|
* check_events 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 unsigned amiga_check_events(struct gendisk *disk, unsigned int clearing)
|
|
{
|
|
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 DISK_EVENT_MEDIA_CHANGE;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct block_device_operations floppy_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = floppy_open,
|
|
.release = floppy_release,
|
|
.ioctl = fd_ioctl,
|
|
.getgeo = fd_getgeo,
|
|
.check_events = amiga_check_events,
|
|
};
|
|
|
|
static struct gendisk *fd_alloc_disk(int drive)
|
|
{
|
|
struct gendisk *disk;
|
|
|
|
disk = alloc_disk(1);
|
|
if (!disk)
|
|
goto out;
|
|
|
|
disk->queue = blk_init_queue(do_fd_request, &amiflop_lock);
|
|
if (IS_ERR(disk->queue)) {
|
|
disk->queue = NULL;
|
|
goto out_put_disk;
|
|
}
|
|
|
|
unit[drive].trackbuf = kmalloc(FLOPPY_MAX_SECTORS * 512, GFP_KERNEL);
|
|
if (!unit[drive].trackbuf)
|
|
goto out_cleanup_queue;
|
|
|
|
return disk;
|
|
|
|
out_cleanup_queue:
|
|
blk_cleanup_queue(disk->queue);
|
|
disk->queue = NULL;
|
|
out_put_disk:
|
|
put_disk(disk);
|
|
out:
|
|
unit[drive].type->code = FD_NODRIVE;
|
|
return NULL;
|
|
}
|
|
|
|
static int __init fd_probe_drives(void)
|
|
{
|
|
int drive,drives,nomem;
|
|
|
|
pr_info("FD: probing units\nfound");
|
|
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 = fd_alloc_disk(drive);
|
|
if (!disk) {
|
|
pr_cont(" no mem for fd%d", drive);
|
|
nomem = 1;
|
|
continue;
|
|
}
|
|
unit[drive].gendisk = disk;
|
|
drives++;
|
|
|
|
pr_cont(" 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];
|
|
set_capacity(disk, 880*2);
|
|
add_disk(disk);
|
|
}
|
|
if ((drives > 0) || (nomem == 0)) {
|
|
if (drives == 0)
|
|
pr_cont(" no drives");
|
|
pr_cont("\n");
|
|
return drives;
|
|
}
|
|
pr_cont("\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_and_module(unit[drive].gendisk);
|
|
}
|
|
|
|
static int __init amiga_floppy_probe(struct platform_device *pdev)
|
|
{
|
|
int i, ret;
|
|
|
|
if (register_blkdev(FLOPPY_MAJOR,"fd"))
|
|
return -EBUSY;
|
|
|
|
ret = -ENOMEM;
|
|
raw_buf = amiga_chip_alloc(RAW_BUF_SIZE, "Floppy");
|
|
if (!raw_buf) {
|
|
printk("fd: cannot get chip mem buffer\n");
|
|
goto out_blkdev;
|
|
}
|
|
|
|
ret = -EBUSY;
|
|
if (request_irq(IRQ_AMIGA_DSKBLK, fd_block_done, 0, "floppy_dma", NULL)) {
|
|
printk("fd: cannot get irq for dma\n");
|
|
goto out_irq;
|
|
}
|
|
|
|
if (request_irq(IRQ_AMIGA_CIAA_TB, ms_isr, 0, "floppy_timer", NULL)) {
|
|
printk("fd: cannot get irq for timer\n");
|
|
goto out_irq2;
|
|
}
|
|
|
|
ret = -ENODEV;
|
|
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 */
|
|
timer_setup(&motor_on_timer, motor_on_callback, 0);
|
|
motor_on_timer.expires = 0;
|
|
for (i = 0; i < FD_MAX_UNITS; i++) {
|
|
timer_setup(&motor_off_timer[i], fd_motor_off, 0);
|
|
motor_off_timer[i].expires = 0;
|
|
timer_setup(&flush_track_timer[i], flush_track_callback, 0);
|
|
flush_track_timer[i].expires = 0;
|
|
|
|
unit[i].track = -1;
|
|
}
|
|
|
|
timer_setup(&post_write_timer, post_write_callback, 0);
|
|
post_write_timer.expires = 0;
|
|
|
|
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:
|
|
free_irq(IRQ_AMIGA_CIAA_TB, NULL);
|
|
out_irq2:
|
|
free_irq(IRQ_AMIGA_DSKBLK, NULL);
|
|
out_irq:
|
|
amiga_chip_free(raw_buf);
|
|
out_blkdev:
|
|
unregister_blkdev(FLOPPY_MAJOR,"fd");
|
|
return ret;
|
|
}
|
|
|
|
static struct platform_driver amiga_floppy_driver = {
|
|
.driver = {
|
|
.name = "amiga-floppy",
|
|
},
|
|
};
|
|
|
|
static int __init amiga_floppy_init(void)
|
|
{
|
|
return platform_driver_probe(&amiga_floppy_driver, amiga_floppy_probe);
|
|
}
|
|
|
|
module_init(amiga_floppy_init);
|
|
|
|
#ifndef MODULE
|
|
static int __init amiga_floppy_setup (char *str)
|
|
{
|
|
int n;
|
|
if (!MACH_IS_AMIGA)
|
|
return 0;
|
|
if (!get_option(&str, &n))
|
|
return 0;
|
|
printk (KERN_INFO "amiflop: Setting default df0 to %x\n", n);
|
|
fd_def_df0 = n;
|
|
return 1;
|
|
}
|
|
|
|
__setup("floppy=", amiga_floppy_setup);
|
|
#endif
|
|
|
|
MODULE_ALIAS("platform:amiga-floppy");
|