diff --git a/drivers/mca/Kconfig b/drivers/mca/Kconfig
new file mode 100644
index 0000000..a7a0220
--- /dev/null
+++ b/drivers/mca/Kconfig
@@ -0,0 +1,14 @@
+config MCA_LEGACY
+	bool "Legacy MCA API Support"
+	depends on MCA
+	help
+	  This compiles in support for the old slot based MCA API.  If you
+	  have an unconverted MCA driver, you will need to say Y here.  It
+	  is safe to say Y anyway.
+
+config MCA_PROC_FS
+	bool "Support for the mca entry in /proc"
+	depends on MCA_LEGACY && PROC_FS
+	help
+	  If you want the old style /proc/mca directory in addition to the
+	  new style sysfs say Y here.
diff --git a/drivers/mca/Makefile b/drivers/mca/Makefile
new file mode 100644
index 0000000..0794b12
--- /dev/null
+++ b/drivers/mca/Makefile
@@ -0,0 +1,7 @@
+# Makefile for the Linux MCA bus support
+
+obj-y	:= mca-bus.o mca-device.o mca-driver.o
+
+obj-$(CONFIG_MCA_PROC_FS)	+= mca-proc.o
+obj-$(CONFIG_MCA_LEGACY)	+= mca-legacy.o
+
diff --git a/drivers/mca/mca-bus.c b/drivers/mca/mca-bus.c
new file mode 100644
index 0000000..ff9be67c
--- /dev/null
+++ b/drivers/mca/mca-bus.c
@@ -0,0 +1,149 @@
+/* -*- mode: c; c-basic-offset: 8 -*- */
+
+/*
+ * MCA bus support functions for sysfs.
+ *
+ * (C) 2002 James Bottomley <James.Bottomley@HansenPartnership.com>
+ *
+**-----------------------------------------------------------------------------
+**  
+**  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.
+**
+**-----------------------------------------------------------------------------
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/mca.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+
+/* Very few machines have more than one MCA bus.  However, there are
+ * those that do (Voyager 35xx/5xxx), so we do it this way for future
+ * expansion.  None that I know have more than 2 */
+static struct mca_bus *mca_root_busses[MAX_MCA_BUSSES];
+
+#define MCA_DEVINFO(i,s) { .pos = i, .name = s }
+
+struct mca_device_info {
+	short pos_id;		/* the 2 byte pos id for this card */
+	char name[DEVICE_NAME_SIZE];
+};
+
+static int mca_bus_match (struct device *dev, struct device_driver *drv)
+{
+	struct mca_device *mca_dev = to_mca_device (dev);
+	struct mca_driver *mca_drv = to_mca_driver (drv);
+	const short *mca_ids = mca_drv->id_table;
+	int i;
+
+	if (!mca_ids)
+		return 0;
+
+	for(i = 0; mca_ids[i]; i++) {
+		if (mca_ids[i] == mca_dev->pos_id) {
+			mca_dev->index = i;
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+struct bus_type mca_bus_type = {
+	.name  = "MCA",
+	.match = mca_bus_match,
+};
+EXPORT_SYMBOL (mca_bus_type);
+
+static ssize_t mca_show_pos_id(struct device *dev, char *buf)
+{
+	/* four digits, \n and trailing \0 */
+	struct mca_device *mca_dev = to_mca_device(dev);
+	int len;
+
+	if(mca_dev->pos_id < MCA_DUMMY_POS_START)
+		len = sprintf(buf, "%04x\n", mca_dev->pos_id);
+	else
+		len = sprintf(buf, "none\n");
+	return len;
+}
+static ssize_t mca_show_pos(struct device *dev, char *buf)
+{
+	/* enough for 8 two byte hex chars plus space and new line */
+	int j, len=0;
+	struct mca_device *mca_dev = to_mca_device(dev);
+
+	for(j=0; j<8; j++)
+		len += sprintf(buf+len, "%02x ", mca_dev->pos[j]);
+	/* change last trailing space to new line */
+	buf[len-1] = '\n';
+	return len;
+}
+
+static DEVICE_ATTR(id, S_IRUGO, mca_show_pos_id, NULL);
+static DEVICE_ATTR(pos, S_IRUGO, mca_show_pos, NULL);
+
+int __init mca_register_device(int bus, struct mca_device *mca_dev)
+{
+	struct mca_bus *mca_bus = mca_root_busses[bus];
+
+	mca_dev->dev.parent = &mca_bus->dev;
+	mca_dev->dev.bus = &mca_bus_type;
+	sprintf (mca_dev->dev.bus_id, "%02d:%02X", bus, mca_dev->slot);
+	mca_dev->dma_mask = mca_bus->default_dma_mask;
+	mca_dev->dev.dma_mask = &mca_dev->dma_mask;
+	mca_dev->dev.coherent_dma_mask = mca_dev->dma_mask;
+
+	if (device_register(&mca_dev->dev))
+		return 0;
+
+	device_create_file(&mca_dev->dev, &dev_attr_id);
+	device_create_file(&mca_dev->dev, &dev_attr_pos);
+
+	return 1;
+}
+
+/* */
+struct mca_bus * __devinit mca_attach_bus(int bus)
+{
+	struct mca_bus *mca_bus;
+
+	if (unlikely(mca_root_busses[bus] != NULL)) {
+		/* This should never happen, but just in case */
+		printk(KERN_EMERG "MCA tried to add already existing bus %d\n",
+		       bus);
+		dump_stack();
+		return NULL;
+	}
+
+	mca_bus = kmalloc(sizeof(struct mca_bus), GFP_KERNEL);
+	if (!mca_bus)
+		return NULL;
+	memset(mca_bus, 0, sizeof(struct mca_bus));
+	sprintf(mca_bus->dev.bus_id,"mca%d",bus);
+	sprintf(mca_bus->name,"Host %s MCA Bridge", bus ? "Secondary" : "Primary");
+	device_register(&mca_bus->dev);
+
+	mca_root_busses[bus] = mca_bus;
+
+	return mca_bus;
+}
+
+int __init mca_system_init (void)
+{
+	return bus_register(&mca_bus_type);
+}
diff --git a/drivers/mca/mca-device.c b/drivers/mca/mca-device.c
new file mode 100644
index 0000000..76d430a
--- /dev/null
+++ b/drivers/mca/mca-device.c
@@ -0,0 +1,217 @@
+/* -*- mode: c; c-basic-offset: 8 -*- */
+
+/*
+ * MCA device support functions
+ *
+ * These functions support the ongoing device access API.
+ *
+ * (C) 2002 James Bottomley <James.Bottomley@HansenPartnership.com>
+ *
+**-----------------------------------------------------------------------------
+**  
+**  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.
+**
+**-----------------------------------------------------------------------------
+ */
+
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/mca.h>
+
+/**
+ *	mca_device_read_stored_pos - read POS register from stored data
+ *	@mca_dev: device to read from
+ *	@reg:  register to read from
+ *
+ *	Fetch a POS value that was stored at boot time by the kernel
+ *	when it scanned the MCA space. The register value is returned.
+ *	Missing or invalid registers report 0.
+ */
+unsigned char mca_device_read_stored_pos(struct mca_device *mca_dev, int reg)
+{
+	if(reg < 0 || reg >= 8)
+		return 0;
+
+	return mca_dev->pos[reg];
+}
+EXPORT_SYMBOL(mca_device_read_stored_pos);
+
+/**
+ *	mca_device_read_pos - read POS register from card
+ *	@mca_dev: device to read from
+ *	@reg:  register to read from
+ *
+ *	Fetch a POS value directly from the hardware to obtain the
+ *	current value. This is much slower than
+ *	mca_device_read_stored_pos and may not be invoked from
+ *	interrupt context. It handles the deep magic required for
+ *	onboard devices transparently.
+ */
+unsigned char mca_device_read_pos(struct mca_device *mca_dev, int reg)
+{
+	struct mca_bus *mca_bus = to_mca_bus(mca_dev->dev.parent);
+
+	return mca_bus->f.mca_read_pos(mca_dev, reg);
+
+	return 	mca_dev->pos[reg];
+}
+EXPORT_SYMBOL(mca_device_read_pos);
+
+
+/**
+ *	mca_device_write_pos - read POS register from card
+ *	@mca_dev: device to write pos register to
+ *	@reg:  register to write to
+ *	@byte: byte to write to the POS registers
+ *
+ *	Store a POS value directly to the hardware. You should not
+ *	normally need to use this function and should have a very good
+ *	knowledge of MCA bus before you do so. Doing this wrongly can
+ *	damage the hardware.
+ *
+ *	This function may not be used from interrupt context.
+ *
+ */
+void mca_device_write_pos(struct mca_device *mca_dev, int reg,
+			  unsigned char byte)
+{
+	struct mca_bus *mca_bus = to_mca_bus(mca_dev->dev.parent);
+
+	mca_bus->f.mca_write_pos(mca_dev, reg, byte);
+}
+EXPORT_SYMBOL(mca_device_write_pos);
+
+/**
+ *	mca_device_transform_irq - transform the ADF obtained IRQ
+ *	@mca_device: device whose irq needs transforming
+ *	@irq: input irq from ADF
+ *
+ *	MCA Adapter Definition Files (ADF) contain irq, ioport, memory
+ *	etc. definitions.  In systems with more than one bus, these need
+ *	to be transformed through bus mapping functions to get the real
+ *	system global quantities.
+ *
+ *	This function transforms the interrupt number and returns the
+ *	transformed system global interrupt
+ */
+int mca_device_transform_irq(struct mca_device *mca_dev, int irq)
+{
+	struct mca_bus *mca_bus = to_mca_bus(mca_dev->dev.parent);
+
+	return mca_bus->f.mca_transform_irq(mca_dev, irq);
+}
+EXPORT_SYMBOL(mca_device_transform_irq);
+
+/**
+ *	mca_device_transform_ioport - transform the ADF obtained I/O port
+ *	@mca_device: device whose port needs transforming
+ *	@ioport: input I/O port from ADF
+ *
+ *	MCA Adapter Definition Files (ADF) contain irq, ioport, memory
+ *	etc. definitions.  In systems with more than one bus, these need
+ *	to be transformed through bus mapping functions to get the real
+ *	system global quantities.
+ *
+ *	This function transforms the I/O port number and returns the
+ *	transformed system global port number.
+ *
+ *	This transformation can be assumed to be linear for port ranges.
+ */
+int mca_device_transform_ioport(struct mca_device *mca_dev, int port)
+{
+	struct mca_bus *mca_bus = to_mca_bus(mca_dev->dev.parent);
+
+	return mca_bus->f.mca_transform_ioport(mca_dev, port);
+}
+EXPORT_SYMBOL(mca_device_transform_ioport);
+
+/**
+ *	mca_device_transform_memory - transform the ADF obtained memory
+ *	@mca_device: device whose memory region needs transforming
+ *	@mem: memory region start from ADF
+ *
+ *	MCA Adapter Definition Files (ADF) contain irq, ioport, memory
+ *	etc. definitions.  In systems with more than one bus, these need
+ *	to be transformed through bus mapping functions to get the real
+ *	system global quantities.
+ *
+ *	This function transforms the memory region start and returns the
+ *	transformed system global memory region (physical).
+ *
+ *	This transformation can be assumed to be linear for region ranges.
+ */
+void *mca_device_transform_memory(struct mca_device *mca_dev, void *mem)
+{
+	struct mca_bus *mca_bus = to_mca_bus(mca_dev->dev.parent);
+
+	return mca_bus->f.mca_transform_memory(mca_dev, mem);
+}
+EXPORT_SYMBOL(mca_device_transform_memory);
+
+
+/**
+ *	mca_device_claimed - check if claimed by driver
+ *	@mca_dev:	device to check
+ *
+ *	Returns 1 if the slot has been claimed by a driver
+ */
+
+int mca_device_claimed(struct mca_device *mca_dev)
+{
+	return mca_dev->driver_loaded;
+}
+EXPORT_SYMBOL(mca_device_claimed);
+
+/**
+ *	mca_device_set_claim - set the claim value of the driver
+ *	@mca_dev:	device to set value for
+ *	@val:		claim value to set (1 claimed, 0 unclaimed)
+ */
+void mca_device_set_claim(struct mca_device *mca_dev, int val)
+{
+	mca_dev->driver_loaded = val;
+}
+EXPORT_SYMBOL(mca_device_set_claim);
+
+/**
+ *	mca_device_status - get the status of the device
+ *	@mca_device:	device to get
+ *
+ *	returns an enumeration of the device status:
+ *
+ *	MCA_ADAPTER_NORMAL	adapter is OK.
+ *	MCA_ADAPTER_NONE	no adapter at device (should never happen).
+ *	MCA_ADAPTER_DISABLED	adapter is disabled.
+ *	MCA_ADAPTER_ERROR	adapter cannot be initialised.
+ */
+enum MCA_AdapterStatus mca_device_status(struct mca_device *mca_dev)
+{
+	return mca_dev->status;
+}
+EXPORT_SYMBOL(mca_device_status);
+
+/**
+ *	mca_device_set_name - set the name of the device
+ *	@mca_device:	device to set the name of
+ *	@name:		name to set
+ */
+void mca_device_set_name(struct mca_device *mca_dev, const char *name)
+{
+	if(!mca_dev)
+		return;
+
+	strlcpy(mca_dev->name, name, sizeof(mca_dev->name));
+}
+EXPORT_SYMBOL(mca_device_set_name);
diff --git a/drivers/mca/mca-driver.c b/drivers/mca/mca-driver.c
new file mode 100644
index 0000000..2223466
--- /dev/null
+++ b/drivers/mca/mca-driver.c
@@ -0,0 +1,50 @@
+/* -*- mode: c; c-basic-offset: 8 -*- */
+
+/*
+ * MCA driver support functions for sysfs.
+ *
+ * (C) 2002 James Bottomley <James.Bottomley@HansenPartnership.com>
+ *
+**-----------------------------------------------------------------------------
+**  
+**  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.
+**
+**-----------------------------------------------------------------------------
+ */
+
+#include <linux/device.h>
+#include <linux/mca.h>
+#include <linux/module.h>
+
+int mca_register_driver(struct mca_driver *mca_drv)
+{
+	int r;
+
+	if (MCA_bus) {
+		mca_drv->driver.bus = &mca_bus_type;
+		if ((r = driver_register(&mca_drv->driver)) < 0)
+			return r;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(mca_register_driver);
+
+void mca_unregister_driver(struct mca_driver *mca_drv)
+{
+	if (MCA_bus)
+		driver_unregister(&mca_drv->driver);
+}
+EXPORT_SYMBOL(mca_unregister_driver);
diff --git a/drivers/mca/mca-legacy.c b/drivers/mca/mca-legacy.c
new file mode 100644
index 0000000..af56313
--- /dev/null
+++ b/drivers/mca/mca-legacy.c
@@ -0,0 +1,348 @@
+/* -*- mode: c; c-basic-offset: 8 -*- */
+
+/*
+ * MCA bus support functions for legacy (2.4) API.
+ *
+ * Legacy API means the API that operates in terms of MCA slot number
+ *
+ * (C) 2002 James Bottomley <James.Bottomley@HansenPartnership.com>
+ *
+**-----------------------------------------------------------------------------
+**  
+**  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.
+**
+**-----------------------------------------------------------------------------
+ */
+
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/mca-legacy.h>
+#include <asm/io.h>
+
+/* NOTE: This structure is stack allocated */
+struct mca_find_adapter_info {
+	int			id;
+	int			slot;
+	struct mca_device	*mca_dev;
+};
+
+/* The purpose of this iterator is to loop over all the devices and
+ * find the one with the smallest slot number that's just greater than
+ * or equal to the required slot with a matching id */
+static int mca_find_adapter_callback(struct device *dev, void *data)
+{
+	struct mca_find_adapter_info *info = data;
+	struct mca_device *mca_dev = to_mca_device(dev);
+
+	if(mca_dev->pos_id != info->id)
+		return 0;
+
+	if(mca_dev->slot < info->slot)
+		return 0;
+
+	if(!info->mca_dev || info->mca_dev->slot >= mca_dev->slot)
+		info->mca_dev = mca_dev;
+
+	return 0;
+}
+
+/**
+ *	mca_find_adapter - scan for adapters
+ *	@id:	MCA identification to search for
+ *	@start:	starting slot
+ *
+ *	Search the MCA configuration for adapters matching the 16bit
+ *	ID given. The first time it should be called with start as zero
+ *	and then further calls made passing the return value of the
+ *	previous call until %MCA_NOTFOUND is returned.
+ *
+ *	Disabled adapters are not reported.
+ */
+
+int mca_find_adapter(int id, int start)
+{
+	struct mca_find_adapter_info info;
+
+	if(id == 0xffff)
+		return MCA_NOTFOUND;
+
+	info.slot = start;
+	info.id = id;
+	info.mca_dev = NULL;
+
+	for(;;) {
+		bus_for_each_dev(&mca_bus_type, NULL, &info, mca_find_adapter_callback);
+
+		if(info.mca_dev == NULL)
+			return MCA_NOTFOUND;
+
+		if(info.mca_dev->status != MCA_ADAPTER_DISABLED)
+			break;
+
+		/* OK, found adapter but it was disabled.  Go around
+		 * again, excluding the slot we just found */
+
+		info.slot = info.mca_dev->slot + 1;
+		info.mca_dev = NULL;
+	}
+		
+	return info.mca_dev->slot;
+}
+EXPORT_SYMBOL(mca_find_adapter);
+
+/*--------------------------------------------------------------------*/
+
+/**
+ *	mca_find_unused_adapter - scan for unused adapters
+ *	@id:	MCA identification to search for
+ *	@start:	starting slot
+ *
+ *	Search the MCA configuration for adapters matching the 16bit
+ *	ID given. The first time it should be called with start as zero
+ *	and then further calls made passing the return value of the
+ *	previous call until %MCA_NOTFOUND is returned.
+ *
+ *	Adapters that have been claimed by drivers and those that
+ *	are disabled are not reported. This function thus allows a driver
+ *	to scan for further cards when some may already be driven.
+ */
+
+int mca_find_unused_adapter(int id, int start)
+{
+	struct mca_find_adapter_info info = { 0 };
+
+	if (!MCA_bus || id == 0xffff)
+		return MCA_NOTFOUND;
+
+	info.slot = start;
+	info.id = id;
+	info.mca_dev = NULL;
+
+	for(;;) {
+		bus_for_each_dev(&mca_bus_type, NULL, &info, mca_find_adapter_callback);
+
+		if(info.mca_dev == NULL)
+			return MCA_NOTFOUND;
+
+		if(info.mca_dev->status != MCA_ADAPTER_DISABLED
+		   && !info.mca_dev->driver_loaded)
+			break;
+
+		/* OK, found adapter but it was disabled or already in
+		 * use.  Go around again, excluding the slot we just
+		 * found */
+
+		info.slot = info.mca_dev->slot + 1;
+		info.mca_dev = NULL;
+	}
+		
+	return info.mca_dev->slot;
+}
+EXPORT_SYMBOL(mca_find_unused_adapter);
+
+/* NOTE: stack allocated structure */
+struct mca_find_device_by_slot_info {
+	int			slot;
+	struct mca_device 	*mca_dev;
+};
+
+static int mca_find_device_by_slot_callback(struct device *dev, void *data)
+{
+	struct mca_find_device_by_slot_info *info = data;
+	struct mca_device *mca_dev = to_mca_device(dev);
+
+	if(mca_dev->slot == info->slot)
+		info->mca_dev = mca_dev;
+
+	return 0;
+}
+
+struct mca_device *mca_find_device_by_slot(int slot)
+{
+	struct mca_find_device_by_slot_info info;
+
+	info.slot = slot;
+	info.mca_dev = NULL;
+
+	bus_for_each_dev(&mca_bus_type, NULL, &info, mca_find_device_by_slot_callback);
+
+	return info.mca_dev;
+}
+EXPORT_SYMBOL(mca_find_device_by_slot);
+
+/**
+ *	mca_read_stored_pos - read POS register from boot data
+ *	@slot: slot number to read from
+ *	@reg:  register to read from
+ *
+ *	Fetch a POS value that was stored at boot time by the kernel
+ *	when it scanned the MCA space. The register value is returned.
+ *	Missing or invalid registers report 0.
+ */
+unsigned char mca_read_stored_pos(int slot, int reg)
+{
+	struct mca_device *mca_dev = mca_find_device_by_slot(slot);
+
+	if(!mca_dev)
+		return 0;
+
+	return mca_device_read_stored_pos(mca_dev, reg);
+}
+EXPORT_SYMBOL(mca_read_stored_pos);
+
+
+/**
+ *	mca_read_pos - read POS register from card
+ *	@slot: slot number to read from
+ *	@reg:  register to read from
+ *
+ *	Fetch a POS value directly from the hardware to obtain the
+ *	current value. This is much slower than mca_read_stored_pos and
+ *	may not be invoked from interrupt context. It handles the
+ *	deep magic required for onboard devices transparently.
+ */
+
+unsigned char mca_read_pos(int slot, int reg)
+{
+	struct mca_device *mca_dev = mca_find_device_by_slot(slot);
+
+	if(!mca_dev)
+		return 0;
+
+	return mca_device_read_pos(mca_dev, reg);
+}
+EXPORT_SYMBOL(mca_read_pos);
+
+		
+/**
+ *	mca_write_pos - read POS register from card
+ *	@slot: slot number to read from
+ *	@reg:  register to read from
+ *	@byte: byte to write to the POS registers
+ *
+ *	Store a POS value directly from the hardware. You should not
+ *	normally need to use this function and should have a very good
+ *	knowledge of MCA bus before you do so. Doing this wrongly can
+ *	damage the hardware.
+ *
+ *	This function may not be used from interrupt context.
+ *
+ *	Note that this a technically a Bad Thing, as IBM tech stuff says
+ *	you should only set POS values through their utilities.
+ *	However, some devices such as the 3c523 recommend that you write
+ *	back some data to make sure the configuration is consistent.
+ *	I'd say that IBM is right, but I like my drivers to work.
+ *
+ *	This function can't do checks to see if multiple devices end up
+ *	with the same resources, so you might see magic smoke if someone
+ *	screws up.
+ */
+
+void mca_write_pos(int slot, int reg, unsigned char byte)
+{
+	struct mca_device *mca_dev = mca_find_device_by_slot(slot);
+
+	if(!mca_dev)
+		return;
+
+	mca_device_write_pos(mca_dev, reg, byte);
+}
+EXPORT_SYMBOL(mca_write_pos);
+
+/**
+ *	mca_set_adapter_name - Set the description of the card
+ *	@slot: slot to name
+ *	@name: text string for the namen
+ *
+ *	This function sets the name reported via /proc for this
+ *	adapter slot. This is for user information only. Setting a
+ *	name deletes any previous name.
+ */
+
+void mca_set_adapter_name(int slot, char* name)
+{
+	struct mca_device *mca_dev = mca_find_device_by_slot(slot);
+
+	if(!mca_dev)
+		return;
+
+	mca_device_set_name(mca_dev, name);
+}
+EXPORT_SYMBOL(mca_set_adapter_name);
+
+/**
+ *	mca_is_adapter_used - check if claimed by driver
+ *	@slot:	slot to check
+ *
+ *	Returns 1 if the slot has been claimed by a driver
+ */
+
+int mca_is_adapter_used(int slot)
+{
+	struct mca_device *mca_dev = mca_find_device_by_slot(slot);
+
+	if(!mca_dev)
+		return 0;
+
+	return mca_device_claimed(mca_dev);
+}
+EXPORT_SYMBOL(mca_is_adapter_used);
+
+/**
+ *	mca_mark_as_used - claim an MCA device
+ *	@slot:	slot to claim
+ *	FIXME:  should we make this threadsafe
+ *
+ *	Claim an MCA slot for a device driver. If the
+ *	slot is already taken the function returns 1,
+ *	if it is not taken it is claimed and 0 is
+ *	returned.
+ */
+
+int mca_mark_as_used(int slot)
+{
+	struct mca_device *mca_dev = mca_find_device_by_slot(slot);
+
+	if(!mca_dev)
+		/* FIXME: this is actually a severe error */
+		return 1;
+
+	if(mca_device_claimed(mca_dev))
+		return 1;
+
+	mca_device_set_claim(mca_dev, 1);
+
+	return 0;
+}
+EXPORT_SYMBOL(mca_mark_as_used);
+
+/**
+ *	mca_mark_as_unused - release an MCA device
+ *	@slot:	slot to claim
+ *
+ *	Release the slot for other drives to use.
+ */
+
+void mca_mark_as_unused(int slot)
+{
+	struct mca_device *mca_dev = mca_find_device_by_slot(slot);
+
+	if(!mca_dev)
+		return;
+
+	mca_device_set_claim(mca_dev, 0);
+}
+EXPORT_SYMBOL(mca_mark_as_unused);
+
diff --git a/drivers/mca/mca-proc.c b/drivers/mca/mca-proc.c
new file mode 100644
index 0000000..33d5e08
--- /dev/null
+++ b/drivers/mca/mca-proc.c
@@ -0,0 +1,249 @@
+/* -*- mode: c; c-basic-offset: 8 -*- */
+
+/*
+ * MCA bus support functions for the proc fs.
+ *
+ * NOTE: this code *requires* the legacy MCA api.
+ *
+ * Legacy API means the API that operates in terms of MCA slot number
+ *
+ * (C) 2002 James Bottomley <James.Bottomley@HansenPartnership.com>
+ *
+**-----------------------------------------------------------------------------
+**  
+**  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.
+**
+**-----------------------------------------------------------------------------
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/mca.h>
+
+static int get_mca_info_helper(struct mca_device *mca_dev, char *page, int len)
+{
+	int j;
+
+	for(j=0; j<8; j++)
+		len += sprintf(page+len, "%02x ",
+			       mca_dev ? mca_dev->pos[j] : 0xff);
+	len += sprintf(page+len, " %s\n", mca_dev ? mca_dev->name : "");
+	return len;
+}
+
+static int get_mca_info(char *page, char **start, off_t off,
+			int count, int *eof, void *data)
+{
+	int i, len = 0;
+
+	if(MCA_bus) {
+		struct mca_device *mca_dev;
+		/* Format POS registers of eight MCA slots */
+
+		for(i=0; i<MCA_MAX_SLOT_NR; i++) {
+			mca_dev = mca_find_device_by_slot(i);
+
+			len += sprintf(page+len, "Slot %d: ", i+1);
+			len = get_mca_info_helper(mca_dev, page, len);
+		}
+
+		/* Format POS registers of integrated video subsystem */
+
+		mca_dev = mca_find_device_by_slot(MCA_INTEGVIDEO);
+		len += sprintf(page+len, "Video : ");
+		len = get_mca_info_helper(mca_dev, page, len);
+
+		/* Format POS registers of integrated SCSI subsystem */
+
+		mca_dev = mca_find_device_by_slot(MCA_INTEGSCSI);
+		len += sprintf(page+len, "SCSI  : ");
+		len = get_mca_info_helper(mca_dev, page, len);
+
+		/* Format POS registers of motherboard */
+
+		mca_dev = mca_find_device_by_slot(MCA_MOTHERBOARD);
+		len += sprintf(page+len, "Planar: ");
+		len = get_mca_info_helper(mca_dev, page, len);
+	} else {
+		/* Leave it empty if MCA not detected - this should *never*
+		 * happen!
+		 */
+	}
+
+	if (len <= off+count) *eof = 1;
+	*start = page + off;
+	len -= off;
+	if (len>count) len = count;
+	if (len<0) len = 0;
+	return len;
+}
+
+/*--------------------------------------------------------------------*/
+
+static int mca_default_procfn(char* buf, struct mca_device *mca_dev)
+{
+	int len = 0, i;
+	int slot = mca_dev->slot;
+
+	/* Print out the basic information */
+
+	if(slot < MCA_MAX_SLOT_NR) {
+		len += sprintf(buf+len, "Slot: %d\n", slot+1);
+	} else if(slot == MCA_INTEGSCSI) {
+		len += sprintf(buf+len, "Integrated SCSI Adapter\n");
+	} else if(slot == MCA_INTEGVIDEO) {
+		len += sprintf(buf+len, "Integrated Video Adapter\n");
+	} else if(slot == MCA_MOTHERBOARD) {
+		len += sprintf(buf+len, "Motherboard\n");
+	}
+	if (mca_dev->name[0]) {
+
+		/* Drivers might register a name without /proc handler... */
+
+		len += sprintf(buf+len, "Adapter Name: %s\n",
+			       mca_dev->name);
+	} else {
+		len += sprintf(buf+len, "Adapter Name: Unknown\n");
+	}
+	len += sprintf(buf+len, "Id: %02x%02x\n",
+		mca_dev->pos[1], mca_dev->pos[0]);
+	len += sprintf(buf+len, "Enabled: %s\nPOS: ",
+		mca_device_status(mca_dev) == MCA_ADAPTER_NORMAL ?
+			"Yes" : "No");
+	for(i=0; i<8; i++) {
+		len += sprintf(buf+len, "%02x ", mca_dev->pos[i]);
+	}
+	len += sprintf(buf+len, "\nDriver Installed: %s",
+		mca_device_claimed(mca_dev) ? "Yes" : "No");
+	buf[len++] = '\n';
+	buf[len] = 0;
+
+	return len;
+} /* mca_default_procfn() */
+
+static int get_mca_machine_info(char* page, char **start, off_t off,
+				 int count, int *eof, void *data)
+{
+	int len = 0;
+
+	len += sprintf(page+len, "Model Id: 0x%x\n", machine_id);
+	len += sprintf(page+len, "Submodel Id: 0x%x\n", machine_submodel_id);
+	len += sprintf(page+len, "BIOS Revision: 0x%x\n", BIOS_revision);
+
+	if (len <= off+count) *eof = 1;
+	*start = page + off;
+	len -= off;
+	if (len>count) len = count;
+	if (len<0) len = 0;
+	return len;
+}
+
+static int mca_read_proc(char *page, char **start, off_t off,
+				 int count, int *eof, void *data)
+{
+	struct mca_device *mca_dev = (struct mca_device *)data;
+	int len = 0;
+
+	/* Get the standard info */
+
+	len = mca_default_procfn(page, mca_dev);
+
+	/* Do any device-specific processing, if there is any */
+
+	if(mca_dev->procfn) {
+		len += mca_dev->procfn(page+len, mca_dev->slot,
+				       mca_dev->proc_dev);
+	}
+	if (len <= off+count) *eof = 1;
+	*start = page + off;
+	len -= off;
+	if (len>count) len = count;
+	if (len<0) len = 0;
+	return len;
+} /* mca_read_proc() */
+
+/*--------------------------------------------------------------------*/
+
+void __init mca_do_proc_init(void)
+{
+	int i;
+	struct proc_dir_entry *proc_mca;
+	struct proc_dir_entry* node = NULL;
+	struct mca_device *mca_dev;
+
+	proc_mca = proc_mkdir("mca", &proc_root);
+	create_proc_read_entry("pos",0,proc_mca,get_mca_info,NULL);
+	create_proc_read_entry("machine",0,proc_mca,get_mca_machine_info,NULL);
+
+	/* Initialize /proc/mca entries for existing adapters */
+
+	for(i = 0; i < MCA_NUMADAPTERS; i++) {
+		enum MCA_AdapterStatus status;
+		mca_dev = mca_find_device_by_slot(i);
+		if(!mca_dev)
+			continue;
+
+		mca_dev->procfn = NULL;
+
+		if(i < MCA_MAX_SLOT_NR) sprintf(mca_dev->procname,"slot%d", i+1);
+		else if(i == MCA_INTEGVIDEO) sprintf(mca_dev->procname,"video");
+		else if(i == MCA_INTEGSCSI) sprintf(mca_dev->procname,"scsi");
+		else if(i == MCA_MOTHERBOARD) sprintf(mca_dev->procname,"planar");
+
+		status = mca_device_status(mca_dev);
+		if (status != MCA_ADAPTER_NORMAL &&
+		    status != MCA_ADAPTER_DISABLED)
+			continue;
+
+		node = create_proc_read_entry(mca_dev->procname, 0, proc_mca,
+					      mca_read_proc, (void *)mca_dev);
+
+		if(node == NULL) {
+			printk("Failed to allocate memory for MCA proc-entries!");
+			return;
+		}
+	}
+
+} /* mca_do_proc_init() */
+
+/**
+ *	mca_set_adapter_procfn - Set the /proc callback
+ *	@slot: slot to configure
+ *	@procfn: callback function to call for /proc
+ *	@dev: device information passed to the callback
+ *
+ *	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.
+ */
+
+void mca_set_adapter_procfn(int slot, MCA_ProcFn procfn, void* proc_dev)
+{
+	struct mca_device *mca_dev = mca_find_device_by_slot(slot);
+
+	if(!mca_dev)
+		return;
+
+	mca_dev->procfn = procfn;
+	mca_dev->proc_dev = proc_dev;
+}
+EXPORT_SYMBOL(mca_set_adapter_procfn);