diff --git a/msys_doc.h b/msys_doc.h
new file mode 100644
index 0000000..9ea523c
--- /dev/null
+++ b/msys_doc.h
@@ -0,0 +1,110 @@
+/*
+ * msys_doc.h: header file of msys_doc.c
+ *
+ *
+ * Copyright 2003   Niki W. Waibel <niki.waibel@gmx.net>
+ *
+ *	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 of the License, 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; if not, write to the Free Software
+ *	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+
+
+#ifndef __MSYS_DOC_H__
+#define __MSYS_DOC_H__ 1
+
+
+
+/* idea from include/linux/mtd/doc2000.h */
+/* registers with __ should not be read/written directly */
+#define MSYSTEMS_DOC_R__ChipID                    0x1000
+#define MSYSTEMS_DOC_R__DOCStatus                 0x1001
+#define MSYSTEMS_DOC_W_DOCControl                 0x1002
+#define MSYSTEMS_DOC_R_FloorSelect                0x1003
+#define MSYSTEMS_DOC_W_FloorSelect                0x1003
+#define MSYSTEMS_DOC_R__CDSNControl               0x1004
+#define MSYSTEMS_DOC_W__CDSNControl               0x1004
+#define MSYSTEMS_DOC_R_CDSNDeviceSelect           0x1005
+#define MSYSTEMS_DOC_W_CDSNDeviceSelect           0x1005
+#define MSYSTEMS_DOC_R_ECCConfiguration           0x1006
+#define MSYSTEMS_DOC_W_ECCConfiguration           0x1006
+#define MSYSTEMS_DOC_R_CDSNSlowIO                 0x100d
+#define MSYSTEMS_DOC_W_CDSNSlowIO                 0x100d
+#define MSYSTEMS_DOC_R_ECCSyndrome0               0x1010
+#define MSYSTEMS_DOC_R_ECCSyndrome1               0x1011
+#define MSYSTEMS_DOC_R_ECCSyndrome2               0x1012
+#define MSYSTEMS_DOC_R_ECCSyndrome3               0x1013
+#define MSYSTEMS_DOC_R_ECCSyndrome4               0x1014
+#define MSYSTEMS_DOC_R_ECCSyndrome5               0x1015
+#define MSYSTEMS_DOC_R_AliasResolution            0x101b
+#define MSYSTEMS_DOC_W_AliasResolution            0x101b
+#define MSYSTEMS_DOC_R_ConfigurationInput         0x101c
+#define MSYSTEMS_DOC_W_ConfigurationInput         0x101c
+#define MSYSTEMS_DOC_R_ReadPipelineInitialization 0x101d
+#define MSYSTEMS_DOC_W_WritePipelineTermination   0x101e
+#define MSYSTEMS_DOC_R_LastDataRead               0x101f
+#define MSYSTEMS_DOC_W_LastDataRead               0x101f
+#define MSYSTEMS_DOC_R_NOP                        0x1020
+#define MSYSTEMS_DOC_W_NOP                        0x1020
+
+#define MSYSTEMS_DOC_R_IPL_0x0000                 0x0000
+#define MSYSTEMS_DOC_R_IPL_0x0001                 0x0001
+#define MSYSTEMS_DOC_R_IPL_0x0002                 0x0002
+#define MSYSTEMS_DOC_R_IPL_0x0003                 0x0003
+
+#define MSYSTEMS_DOC_R_CDSNIO_BASE                0x0800
+#define MSYSTEMS_DOC_W_CDSNIO_BASE                0x0800
+
+
+
+#define doc_read(base,reg) \
+	(*(volatile unsigned char *)(base + MSYSTEMS_DOC_R_##reg))
+
+#define doc_read_nop(base) \
+	doc_read(base, NOP)
+
+#define doc_read_2nop(base) \
+	{ doc_read_nop(base); doc_read_nop(base); }
+
+#define doc_read_4nop(base) \
+	{ doc_read_2nop(base); doc_read_2nop(base); }
+
+#define doc_write(data,base,reg) \
+	(*(volatile unsigned char *)(base + MSYSTEMS_DOC_W_##reg)) = data
+
+#define doc_write_nop(base) \
+	doc_write(0, base, NOP)
+
+#define doc_write_2nop(base) \
+	{ doc_write_nop(base); doc_write_nop(base); }
+
+#define doc_write_4nop(base) \
+	{ doc_write_2nop(base); doc_write_2nop(base); }
+
+#define _doc_busy(base)   /* 0: ready; -1: busy */ \
+	( ((doc_read(base, _CDSNControl) & 0x80) >> 7) - 1)
+
+#define doc_toggle(base)   /* 0, 1, 0, 1, 0, 1, ... if a doc is present */ \
+	( (doc_read(base, ECCConfiguration) & 0x04) >> 2 )
+
+
+
+extern int probe_md2802(struct flashchip *flash);
+extern int read_md2802(struct flashchip *flash, unsigned char *buf);
+extern int erase_md2802(struct flashchip *flash);
+extern int write_md2802(struct flashchip *flash, unsigned char *buf);
+
+
+
+#endif /* !__MSYS_DOC_H__ */