diff --git a/drivers/cdrom/mcdx.h b/drivers/cdrom/mcdx.h
new file mode 100644
index 0000000..83c364a
--- /dev/null
+++ b/drivers/cdrom/mcdx.h
@@ -0,0 +1,185 @@
+/*
+ * Definitions for the Mitsumi CDROM interface
+ * Copyright (C) 1995 1996 Heiko Schlittermann <heiko@lotte.sax.de>
+ * VERSION: @VERSION@
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Thanks to
+ *  The Linux Community at all and ...
+ *  Martin Harris (he wrote the first Mitsumi Driver)
+ *  Eberhard Moenkeberg (he gave me much support and the initial kick)
+ *  Bernd Huebner, Ruediger Helsch (Unifix-Software Gmbh, they
+ *      improved the original driver)
+ *  Jon Tombs, Bjorn Ekwall (module support)
+ *  Daniel v. Mosnenck (he sent me the Technical and Programming Reference)
+ *  Gerd Knorr (he lent me his PhotoCD)
+ *  Nils Faerber and Roger E. Wolff (extensively tested the LU portion)
+ *  Andreas Kies (testing the mysterious hang up's)
+ *  ... somebody forgotten?
+ *  Marcin Dalecki
+ *  
+ */
+
+/*
+ *	The following lines are for user configuration
+ *	~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *	{0|1} -- 1 if you want the driver detect your drive, may crash and
+ *	needs a long time to seek.  The higher the address the longer the
+ *	seek.
+ *
+ *  WARNING: AUTOPROBE doesn't work.
+ */
+#define MCDX_AUTOPROBE 0
+
+/*
+ *	Drive specific settings according to the jumpers on the controller
+ *	board(s).
+ *	o	MCDX_NDRIVES  :  number of used entries of the following table
+ *	o	MCDX_DRIVEMAP :  table of {i/o base, irq} per controller
+ *
+ *	NOTE: I didn't get a drive at irq 9(2) working.  Not even alone.
+ */
+#if MCDX_AUTOPROBE == 0
+	#define MCDX_NDRIVES 1
+	#define MCDX_DRIVEMAP {		\
+			{0x300, 11},	\
+			{0x304, 05},  	\
+			{0x000, 00},  	\
+			{0x000, 00},  	\
+			{0x000, 00},  	\
+	  	}
+#else
+	#error Autoprobing is not implemented yet.
+#endif
+
+#ifndef MCDX_QUIET
+#define MCDX_QUIET   1
+#endif
+
+#ifndef MCDX_DEBUG
+#define MCDX_DEBUG   0
+#endif
+
+/* *** make the following line uncommented, if you're sure,
+ * *** all configuration is done */
+/* #define I_WAS_HERE */
+
+/*	The name of the device */
+#define MCDX "mcdx"	
+
+/* Flags for DEBUGGING */
+#define INIT 		0
+#define MALLOC 		0
+#define IOCTL 		0
+#define PLAYTRK     0
+#define SUBCHNL     0
+#define TOCHDR      0
+#define MS          0
+#define PLAYMSF     0
+#define READTOC     0
+#define OPENCLOSE 	0
+#define HW		    0
+#define TALK		0
+#define IRQ 		0
+#define XFER 		0
+#define REQUEST	 	0
+#define SLEEP		0
+
+/*	The following addresses are taken from the Mitsumi Reference 
+ *  and describe the possible i/o range for the controller.
+ */
+#define MCDX_IO_BEGIN	((char*) 0x300)	/* first base of i/o addr */
+#define MCDX_IO_END		((char*) 0x3fc)	/* last base of i/o addr */
+
+/*	Per controller 4 bytes i/o are needed. */
+#define MCDX_IO_SIZE		4
+
+/*
+ *	Bits
+ */
+
+/* The status byte, returned from every command, set if
+ * the description is true */
+#define MCDX_RBIT_OPEN       0x80	/* door is open */
+#define MCDX_RBIT_DISKSET    0x40	/* disk set (recognised) */
+#define MCDX_RBIT_CHANGED    0x20	/* disk was changed */
+#define MCDX_RBIT_CHECK      0x10	/* disk rotates, servo is on */
+#define MCDX_RBIT_AUDIOTR    0x08   /* current track is audio */
+#define MCDX_RBIT_RDERR      0x04	/* read error, refer SENSE KEY */
+#define MCDX_RBIT_AUDIOBS    0x02	/* currently playing audio */
+#define MCDX_RBIT_CMDERR     0x01	/* command, param or format error */
+
+/* The I/O Register holding the h/w status of the drive,
+ * can be read at i/o base + 1 */
+#define MCDX_RBIT_DOOR       0x10	/* door is open */
+#define MCDX_RBIT_STEN       0x04	/* if 0, i/o base contains drive status */
+#define MCDX_RBIT_DTEN       0x02	/* if 0, i/o base contains data */
+
+/*
+ *	The commands.
+ */
+
+#define OPCODE	1		/* offset of opcode */
+#define MCDX_CMD_REQUEST_TOC		1, 0x10
+#define MCDX_CMD_REQUEST_STATUS		1, 0x40 
+#define MCDX_CMD_RESET				1, 0x60
+#define MCDX_CMD_REQUEST_DRIVE_MODE	1, 0xc2
+#define MCDX_CMD_SET_INTERLEAVE		2, 0xc8, 0
+#define MCDX_CMD_DATAMODE_SET		2, 0xa0, 0
+	#define MCDX_DATAMODE1		0x01
+	#define MCDX_DATAMODE2		0x02
+#define MCDX_CMD_LOCK_DOOR		2, 0xfe, 0
+
+#define READ_AHEAD			4	/* 8 Sectors (4K) */
+
+/*	Useful macros */
+#define e_door(x)		((x) & MCDX_RBIT_OPEN)
+#define e_check(x)		(~(x) & MCDX_RBIT_CHECK)
+#define e_notset(x)		(~(x) & MCDX_RBIT_DISKSET)
+#define e_changed(x)	((x) & MCDX_RBIT_CHANGED)
+#define e_audio(x)		((x) & MCDX_RBIT_AUDIOTR)
+#define e_audiobusy(x)	((x) & MCDX_RBIT_AUDIOBS)
+#define e_cmderr(x)		((x) & MCDX_RBIT_CMDERR)
+#define e_readerr(x)	((x) & MCDX_RBIT_RDERR)
+
+/**	no drive specific */
+#define MCDX_CDBLK	2048	/* 2048 cooked data each blk */
+
+#define MCDX_DATA_TIMEOUT	(HZ/10)	/* 0.1 second */
+
+/*
+ * Access to the msf array
+ */
+#define MSF_MIN		0			/* minute */
+#define MSF_SEC		1			/* second */
+#define MSF_FRM		2			/* frame  */
+
+/*
+ * Errors
+ */
+#define MCDX_E		1			/* unspec error */
+#define MCDX_ST_EOM 0x0100		/* end of media */
+#define MCDX_ST_DRV 0x00ff		/* mask to query the drive status */
+
+#ifndef I_WAS_HERE
+#ifndef MODULE
+#warning You have not edited mcdx.h
+#warning Perhaps irq and i/o settings are wrong.
+#endif
+#endif
+
+/* ex:set ts=4 sw=4: */