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diff --git a/include/asm-mips/sgi/gio.h b/include/asm-mips/sgi/gio.h
new file mode 100644
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+++ b/include/asm-mips/sgi/gio.h
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+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * gio.h: Definitions for SGI GIO bus
+ *
+ * Copyright (C) 2002 Ladislav Michl
+ */
+
+#ifndef _SGI_GIO_H
+#define _SGI_GIO_H
+
+/*
+ * GIO bus addresses
+ *
+ * The Indigo and Indy have two GIO bus connectors. Indigo2 (all models) have
+ * three physical connectors, but only two slots, GFX and EXP0.
+ * 
+ * There is 10MB of GIO address space for GIO64 slot devices
+ * slot#   slot type address range            size
+ * -----   --------- ----------------------- -----
+ *   0     GFX       0x1f000000 - 0x1f3fffff   4MB
+ *   1     EXP0      0x1f400000 - 0x1f5fffff   2MB
+ *   2     EXP1      0x1f600000 - 0x1f9fffff   4MB
+ *
+ * There are un-slotted devices, HPC, I/O and misc devices, which are grouped
+ * into the HPC address space.
+ *   -     MISC      0x1fb00000 - 0x1fbfffff   1MB
+ *
+ * Following space is reserved and unused
+ *   -     RESERVED  0x18000000 - 0x1effffff 112MB
+ *
+ * GIO bus IDs
+ *
+ * Each GIO bus device identifies itself to the system by answering a
+ * read with an "ID" value. IDs are either 8 or 32 bits long. IDs less
+ * than 128 are 8 bits long, with the most significant 24 bits read from
+ * the slot undefined.
+ *
+ * 32-bit IDs are divided into
+ *      bits 0:6        the product ID; ranges from 0x00 to 0x7F.
+ *      bit 7           0=GIO Product ID is 8 bits wide
+ *                      1=GIO Product ID is 32 bits wide.
+ *      bits 8:15       manufacturer version for the product.
+ *      bit 16          0=GIO32 and GIO32-bis, 1=GIO64.
+ *      bit 17          0=no ROM present
+ *                      1=ROM present on this board AND next three words
+ *                      space define the ROM.
+ *      bits 18:31      up to manufacturer.
+ *
+ * IDs above 0x50/0xd0 are of 3rd party boards.
+ *
+ * 8-bit IDs
+ *      0x01            XPI low cost FDDI
+ *      0x02            GTR TokenRing
+ *      0x04            Synchronous ISDN
+ *      0x05            ATM board [*]
+ *      0x06            Canon Interface
+ *      0x07            16 bit SCSI Card [*]
+ *      0x08            JPEG (Double Wide)
+ *      0x09            JPEG (Single Wide)
+ *      0x0a            XPI mez. FDDI device 0
+ *      0x0b            XPI mez. FDDI device 1
+ *      0x0c            SMPTE 259M Video [*]
+ *      0x0d            Babblefish Compression [*]
+ *      0x0e            E-Plex 8-port Ethernet
+ *      0x30            Lyon Lamb IVAS
+ *      0xb8            GIO 100BaseTX Fast Ethernet (gfe)
+ *
+ * [*] Device provide 32-bit ID.
+ *
+ */
+
+#define GIO_ID(x)               (x & 0x7f)
+#define GIO_32BIT_ID            0x80
+#define GIO_REV(x)              ((x >> 8) & 0xff)
+#define GIO_64BIT_IFACE         0x10000
+#define GIO_ROM_PRESENT         0x20000
+#define GIO_VENDOR_CODE(x)      ((x >> 18) & 0x3fff)
+
+#define GIO_SLOT_GFX_BASE       0x1f000000
+#define GIO_SLOT_EXP0_BASE      0x1f400000
+#define GIO_SLOT_EXP1_BASE      0x1f600000
+
+#endif /* _SGI_GIO_H */