diff --git a/include/linux/mca.h b/include/linux/mca.h
new file mode 100644
index 0000000..5cff292
--- /dev/null
+++ b/include/linux/mca.h
@@ -0,0 +1,146 @@
+/*
+ * Header for Microchannel Architecture Bus
+ * Written by Martin Kolinek, February 1996
+ */
+
+#ifndef _LINUX_MCA_H
+#define _LINUX_MCA_H
+
+#include <linux/device.h>
+
+#ifdef CONFIG_MCA
+#include <asm/mca.h>
+
+extern int MCA_bus;
+#else
+#define MCA_bus 0
+#endif
+
+/* This sets up an information callback for /proc/mca/slot?.  The
+ * function is called with the buffer, slot, and device pointer (or
+ * some equally informative context information, or nothing, if you
+ * prefer), and is expected to put useful information into the
+ * buffer.  The adapter name, id, and POS registers get printed
+ * before this is called though, so don't do it again.
+ *
+ * This should be called with a NULL procfn when a module
+ * unregisters, thus preventing kernel crashes and other such
+ * nastiness.
+ */
+typedef int (*MCA_ProcFn)(char* buf, int slot, void* dev);
+
+/* Should only be called by the NMI interrupt handler, this will do some
+ * fancy stuff to figure out what might have generated a NMI.
+ */
+extern void mca_handle_nmi(void);
+
+enum MCA_AdapterStatus {
+	MCA_ADAPTER_NORMAL = 0,
+	MCA_ADAPTER_NONE = 1,
+	MCA_ADAPTER_DISABLED = 2,
+	MCA_ADAPTER_ERROR = 3
+};
+
+struct mca_device {
+	u64			dma_mask;
+	int			pos_id;
+	int			slot;
+
+	/* index into id_table, set by the bus match routine */
+	int			index;
+
+	/* is there a driver installed? 0 - No, 1 - Yes */
+	int			driver_loaded;
+	/* POS registers */
+	unsigned char		pos[8];
+	/* if a pseudo adapter of the motherboard, this is the motherboard
+	 * register value to use for setup cycles */
+	short			pos_register;
+	
+	enum MCA_AdapterStatus	status;
+#ifdef CONFIG_MCA_PROC_FS
+	/* name of the proc/mca file */
+	char			procname[8];
+	/* /proc info callback */
+	MCA_ProcFn		procfn;
+	/* device/context info for proc callback */
+	void			*proc_dev;
+#endif
+	struct device		dev;
+	char			name[32];
+};
+#define to_mca_device(mdev) container_of(mdev, struct mca_device, dev)
+
+struct mca_bus_accessor_functions {
+	unsigned char	(*mca_read_pos)(struct mca_device *, int reg);
+	void		(*mca_write_pos)(struct mca_device *, int reg,
+					 unsigned char byte);
+	int		(*mca_transform_irq)(struct mca_device *, int irq);
+	int		(*mca_transform_ioport)(struct mca_device *,
+						  int region);
+	void *		(*mca_transform_memory)(struct mca_device *,
+						void *memory);
+};
+
+struct mca_bus {
+	u64			default_dma_mask;
+	int			number;
+	struct mca_bus_accessor_functions f;
+	struct device		dev;
+	char			name[32];
+};
+#define to_mca_bus(mdev) container_of(mdev, struct mca_bus, dev)
+
+struct mca_driver {
+	const short		*id_table;
+	void			*driver_data;
+	struct device_driver	driver;
+};
+#define to_mca_driver(mdriver) container_of(mdriver, struct mca_driver, driver)
+
+/* Ongoing supported API functions */
+extern struct mca_device *mca_find_device_by_slot(int slot);
+extern int mca_system_init(void);
+extern struct mca_bus *mca_attach_bus(int);
+
+extern unsigned char mca_device_read_stored_pos(struct mca_device *mca_dev,
+						int reg);
+extern unsigned char mca_device_read_pos(struct mca_device *mca_dev, int reg);
+extern void mca_device_write_pos(struct mca_device *mca_dev, int reg,
+				 unsigned char byte);
+extern int mca_device_transform_irq(struct mca_device *mca_dev, int irq);
+extern int mca_device_transform_ioport(struct mca_device *mca_dev, int port);
+extern void *mca_device_transform_memory(struct mca_device *mca_dev,
+					 void *mem);
+extern int mca_device_claimed(struct mca_device *mca_dev);
+extern void mca_device_set_claim(struct mca_device *mca_dev, int val);
+extern void mca_device_set_name(struct mca_device *mca_dev, const char *name);
+static inline char *mca_device_get_name(struct mca_device *mca_dev)
+{
+	return mca_dev ? mca_dev->name : NULL;
+}
+
+extern enum MCA_AdapterStatus mca_device_status(struct mca_device *mca_dev);
+
+extern struct bus_type mca_bus_type;
+
+extern int mca_register_driver(struct mca_driver *drv);
+extern void mca_unregister_driver(struct mca_driver *drv);
+
+/* WARNING: only called by the boot time device setup */
+extern int mca_register_device(int bus, struct mca_device *mca_dev);
+
+#ifdef CONFIG_MCA_PROC_FS
+extern void mca_do_proc_init(void);
+extern void mca_set_adapter_procfn(int slot, MCA_ProcFn, void* dev);
+#else
+static inline void mca_do_proc_init(void)
+{
+}
+
+static inline void mca_set_adapter_procfn(int slot, MCA_ProcFn fn, void* dev)
+{
+}
+#endif
+
+#endif /* _LINUX_MCA_H */