linux-imx

/*

 *  drivers/block/ataflop.c

 *

 *  Copyright (C) 1993  Greg Harp

 *  Atari Support by Bjoern Brauel, Roman Hodek

 *

 *  Big cleanup Sep 11..14 1994 Roman Hodek:

 *   - Driver now works interrupt driven

 *   - Support for two drives; should work, but I cannot test that :-(

 *   - Reading is done in whole tracks and buffered to speed up things

 *   - Disk change detection and drive deselecting after motor-off

 *     similar to TOS

 *   - Autodetection of disk format (DD/HD); untested yet, because I

 *     don't have an HD drive :-(

 *

 *  Fixes Nov 13 1994 Martin Schaller:

 *   - Autodetection works now

 *   - Support for 5 1/4'' disks

 *   - Removed drive type (unknown on atari)

 *   - Do seeks with 8 Mhz

 *

 *  Changes by Andreas Schwab:

 *   - After errors in multiple read mode try again reading single sectors

 *  (Feb 1995):

 *   - Clean up error handling

 *   - Set blk_size for proper size checking

 *   - Initialize track register when testing presence of floppy

 *   - Implement some ioctl's

 *

 *  Changes by Torsten Lang:

 *   - When probing the floppies we should add the FDCCMDADD_H flag since

 *     the FDC will otherwise wait forever when no disk is inserted...

 *

 * ++ Freddi Aschwanden (fa) 20.9.95 fixes for medusa:

 *  - MFPDELAY() after each FDC access -> atari 

 *  - more/other disk formats

 *  - DMA to the block buffer directly if we have a 32bit DMA

 *  - for medusa, the step rate is always 3ms

 *  - on medusa, use only cache_push()

 * Roman:

 *  - Make disk format numbering independent from minors

 *  - Let user set max. supported drive type (speeds up format

 *    detection, saves buffer space)

 *

 * Roman 10/15/95:

 *  - implement some more ioctls

 *  - disk formatting

 *  

 * Andreas 95/12/12:

 *  - increase gap size at start of track for HD/ED disks

 *

 * Michael (MSch) 11/07/96:

 *  - implemented FDSETPRM and FDDEFPRM ioctl

 *

 * Andreas (97/03/19):

 *  - implemented missing BLK* ioctls

 *

 *  Things left to do:

 *   - Formatting

 *   - Maybe a better strategy for disk change detection (does anyone

 *     know one?)

 */

​

#include <linux/module.h>

​

#include <linux/fd.h>

#include <linux/delay.h>

#include <linux/init.h>

#include <linux/blk-mq.h>

#include <linux/mutex.h>

#include <linux/completion.h>

#include <linux/wait.h>

​

#include <asm/atariints.h>

#include <asm/atari_stdma.h>

#include <asm/atari_stram.h>

​

#define FD_MAX_UNITS 2

​

#undef DEBUG

​

static DEFINE_MUTEX(ataflop_mutex);

static struct request *fd_request;

​

/*

 * WD1772 stuff

 */

​

/* register codes */

​

#define FDCSELREG_STP   (0x80)   /* command/status register */

#define FDCSELREG_TRA   (0x82)   /* track register */