arch/powerpc/kernel/ibmebus.c - kernel/msm-4.19 - Gitiles

 /*
  * IBM PowerPC IBM eBus Infrastructure Support.
  *
  * Copyright (c) 2005 IBM Corporation
  *  Heiko J Schick <schickhj@de.ibm.com>
  *
  * All rights reserved.
  *
  * This source code is distributed under a dual license of GPL v2.0 and OpenIB
  * BSD.
  *
  * OpenIB BSD License
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  * Redistributions of source code must retain the above copyright notice, this
  * list of conditions and the following disclaimer.
  *
  * Redistributions in binary form must reproduce the above copyright notice,
  * this list of conditions and the following disclaimer in the documentation
  * and/or other materials
  * provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  */

 #include <linux/init.h>
 #include <linux/console.h>
 #include <linux/kobject.h>
 #include <linux/dma-mapping.h>
 #include <linux/interrupt.h>
 #include <asm/ibmebus.h>
 #include <asm/abs_addr.h>

 static struct ibmebus_dev ibmebus_bus_device = { /* fake "parent" device */
 	.name = ibmebus_bus_device.ofdev.dev.bus_id,
 	.ofdev.dev.bus_id = "ibmebus",
 	.ofdev.dev.bus    = &ibmebus_bus_type,
 };

 static void *ibmebus_alloc_coherent(struct device *dev,
 				    size_t size,
 				    dma_addr_t *dma_handle,
 				    gfp_t flag)
 {
 	void *mem;

 	mem = kmalloc(size, flag);
 	*dma_handle = (dma_addr_t)mem;

 	return mem;
 }

 static void ibmebus_free_coherent(struct device *dev,
 				  size_t size, void *vaddr,
 				  dma_addr_t dma_handle)
 {
 	kfree(vaddr);
 }

 static dma_addr_t ibmebus_map_single(struct device *dev,
 				     void *ptr,
 				     size_t size,
 				     enum dma_data_direction direction)
 {
 	return (dma_addr_t)(ptr);
 }

 static void ibmebus_unmap_single(struct device *dev,
 				 dma_addr_t dma_addr,
 				 size_t size,
 				 enum dma_data_direction direction)
 {
 	return;
 }

 static int ibmebus_map_sg(struct device *dev,
 			  struct scatterlist *sg,
 			  int nents, enum dma_data_direction direction)
 {
 	int i;

 	for (i = 0; i < nents; i++) {
 		sg[i].dma_address = (dma_addr_t)page_address(sg[i].page)
 			+ sg[i].offset;
 		sg[i].dma_length = sg[i].length;
 	}

 	return nents;
 }

 static void ibmebus_unmap_sg(struct device *dev,
 			     struct scatterlist *sg,
 			     int nents, enum dma_data_direction direction)
 {
 	return;
 }

 static int ibmebus_dma_supported(struct device *dev, u64 mask)
 {
 	return 1;
 }

 struct dma_mapping_ops ibmebus_dma_ops = {
 	.alloc_coherent = ibmebus_alloc_coherent,
 	.free_coherent  = ibmebus_free_coherent,
 	.map_single     = ibmebus_map_single,
 	.unmap_single   = ibmebus_unmap_single,
 	.map_sg         = ibmebus_map_sg,
 	.unmap_sg       = ibmebus_unmap_sg,
 	.dma_supported  = ibmebus_dma_supported,
 };

 static int ibmebus_bus_probe(struct device *dev)
 {
 	struct ibmebus_dev *ibmebusdev    = to_ibmebus_dev(dev);
 	struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver);
 	const struct of_device_id *id;
 	int error = -ENODEV;

 	if (!ibmebusdrv->probe)
 		return error;

 	id = of_match_device(ibmebusdrv->id_table, &ibmebusdev->ofdev);
 	if (id) {
 		error = ibmebusdrv->probe(ibmebusdev, id);
 	}

 	return error;
 }

 static int ibmebus_bus_remove(struct device *dev)
 {
 	struct ibmebus_dev *ibmebusdev    = to_ibmebus_dev(dev);
 	struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver);

 	if (ibmebusdrv->remove) {
 		return ibmebusdrv->remove(ibmebusdev);
 	}

 	return 0;
 }

 static void __devinit ibmebus_dev_release(struct device *dev)
 {
 	of_node_put(to_ibmebus_dev(dev)->ofdev.node);
 	kfree(to_ibmebus_dev(dev));
 }

 static ssize_t ibmebusdev_show_name(struct device *dev,
 				    struct device_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%s\n", to_ibmebus_dev(dev)->name);
 }
 static DEVICE_ATTR(name, S_IRUSR | S_IRGRP | S_IROTH, ibmebusdev_show_name,
 		   NULL);

 static struct ibmebus_dev* __devinit ibmebus_register_device_common(
 	struct ibmebus_dev *dev, const char *name)
 {
 	int err = 0;

 	dev->name = name;
 	dev->ofdev.dev.parent  = &ibmebus_bus_device.ofdev.dev;
 	dev->ofdev.dev.bus     = &ibmebus_bus_type;
 	dev->ofdev.dev.release = ibmebus_dev_release;

 	/* An ibmebusdev is based on a of_device. We have to change the
 	 * bus type to use our own DMA mapping operations.
 	 */
 	if ((err = of_device_register(&dev->ofdev)) != 0) {
 		printk(KERN_ERR "%s: failed to register device (%d).\n",
 		       __FUNCTION__, err);
 		return NULL;
 	}

 	device_create_file(&dev->ofdev.dev, &dev_attr_name);

 	return dev;
 }

 static struct ibmebus_dev* __devinit ibmebus_register_device_node(
 	struct device_node *dn)
 {
 	struct ibmebus_dev *dev;
 	const char *loc_code;
 	int length;

 	loc_code = get_property(dn, "ibm,loc-code", NULL);
 	if (!loc_code) {
                 printk(KERN_WARNING "%s: node %s missing 'ibm,loc-code'\n",
 		       __FUNCTION__, dn->name ? dn->name : "<unknown>");
 		return NULL;
         }

 	if (strlen(loc_code) == 0) {
 	        printk(KERN_WARNING "%s: 'ibm,loc-code' is invalid\n",
 		       __FUNCTION__);
 		return NULL;
 	}

 	dev = kmalloc(sizeof(struct ibmebus_dev), GFP_KERNEL);
 	if (!dev) {
 		return NULL;
 	}
 	memset(dev, 0, sizeof(struct ibmebus_dev));

 	dev->ofdev.node = of_node_get(dn);

 	length = strlen(loc_code);
 	memcpy(dev->ofdev.dev.bus_id, loc_code
 		+ (length - min(length, BUS_ID_SIZE - 1)),
 		min(length, BUS_ID_SIZE - 1));

 	/* Register with generic device framework. */
 	if (ibmebus_register_device_common(dev, dn->name) == NULL) {
 		kfree(dev);
 		return NULL;
 	}

 	return dev;
 }

 static void ibmebus_probe_of_nodes(char* name)
 {
 	struct device_node *dn = NULL;

 	while ((dn = of_find_node_by_name(dn, name))) {
 		if (ibmebus_register_device_node(dn) == NULL) {
 			of_node_put(dn);

 			return;
 		}
 	}

 	of_node_put(dn);

 	return;
 }

 static void ibmebus_add_devices_by_id(struct of_device_id *idt)
 {
 	while (strlen(idt->name) > 0) {
 		ibmebus_probe_of_nodes(idt->name);
 		idt++;
 	}

 	return;
 }

 static int ibmebus_match_helper(struct device *dev, void *data)
 {
 	if (strcmp((char*)data, to_ibmebus_dev(dev)->name) == 0)
 		return 1;

 	return 0;
 }

 static int ibmebus_unregister_device(struct device *dev)
 {
 	device_remove_file(dev, &dev_attr_name);
 	of_device_unregister(to_of_device(dev));

 	return 0;
 }

 static void ibmebus_remove_devices_by_id(struct of_device_id *idt)
 {
 	struct device *dev;

 	while (strlen(idt->name) > 0) {
 		while ((dev = bus_find_device(&ibmebus_bus_type, NULL,
 					      (void*)idt->name,
 					      ibmebus_match_helper))) {
 			ibmebus_unregister_device(dev);
 		}
 		idt++;

 	}

 	return;
 }

 int ibmebus_register_driver(struct ibmebus_driver *drv)
 {
 	int err = 0;

 	drv->driver.name   = drv->name;
 	drv->driver.bus    = &ibmebus_bus_type;
 	drv->driver.probe  = ibmebus_bus_probe;
 	drv->driver.remove = ibmebus_bus_remove;

 	if ((err = driver_register(&drv->driver) != 0))
 		return err;

 	ibmebus_add_devices_by_id(drv->id_table);

 	return 0;
 }
 EXPORT_SYMBOL(ibmebus_register_driver);

 void ibmebus_unregister_driver(struct ibmebus_driver *drv)
 {
 	driver_unregister(&drv->driver);
 	ibmebus_remove_devices_by_id(drv->id_table);
 }
 EXPORT_SYMBOL(ibmebus_unregister_driver);

 int ibmebus_request_irq(struct ibmebus_dev *dev,
 			u32 ist,
 			irqreturn_t (*handler)(int, void*, struct pt_regs *),
 			unsigned long irq_flags, const char * devname,
 			void *dev_id)
 {
 	unsigned int irq = irq_create_mapping(NULL, ist);

 	if (irq == NO_IRQ)
 		return -EINVAL;

 	return request_irq(irq, handler,
 			   irq_flags, devname, dev_id);
 }
 EXPORT_SYMBOL(ibmebus_request_irq);

 void ibmebus_free_irq(struct ibmebus_dev *dev, u32 ist, void *dev_id)
 {
 	unsigned int irq = irq_find_mapping(NULL, ist);

 	free_irq(irq, dev_id);
 }
 EXPORT_SYMBOL(ibmebus_free_irq);

 static int ibmebus_bus_match(struct device *dev, struct device_driver *drv)
 {
 	const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
 	struct ibmebus_driver *ebus_drv    = to_ibmebus_driver(drv);
 	const struct of_device_id *ids     = ebus_drv->id_table;
 	const struct of_device_id *found_id;

 	if (!ids)
 		return 0;

 	found_id = of_match_device(ids, &ebus_dev->ofdev);
 	if (found_id)
 		return 1;

 	return 0;
 }

 struct bus_type ibmebus_bus_type = {
 	.name = "ibmebus",
 	.match = ibmebus_bus_match,
 };
 EXPORT_SYMBOL(ibmebus_bus_type);

 static int __init ibmebus_bus_init(void)
 {
 	int err;

 	printk(KERN_INFO "IBM eBus Device Driver\n");

 	err = bus_register(&ibmebus_bus_type);
 	if (err) {
 		printk(KERN_ERR ":%s: failed to register IBM eBus.\n",
 		       __FUNCTION__);
 		return err;
 	}

 	err = device_register(&ibmebus_bus_device.ofdev.dev);
 	if (err) {
 		printk(KERN_WARNING "%s: device_register returned %i\n",
 		       __FUNCTION__, err);
 		bus_unregister(&ibmebus_bus_type);

 		return err;
 	}

 	return 0;
 }
 __initcall(ibmebus_bus_init);
	/*
	* IBM PowerPC IBM eBus Infrastructure Support.
	*
	* Copyright (c) 2005 IBM Corporation
	* Heiko J Schick <schickhj@de.ibm.com>
	*
	* All rights reserved.
	*
	* This source code is distributed under a dual license of GPL v2.0 and OpenIB
	* BSD.
	*
	* OpenIB BSD License
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are met:
	*
	* Redistributions of source code must retain the above copyright notice, this
	* list of conditions and the following disclaimer.
	*
	* Redistributions in binary form must reproduce the above copyright notice,
	* this list of conditions and the following disclaimer in the documentation
	* and/or other materials
	* provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
	* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
	* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	* POSSIBILITY OF SUCH DAMAGE.
	*/

	#include <linux/init.h>
	#include <linux/console.h>
	#include <linux/kobject.h>
	#include <linux/dma-mapping.h>
	#include <linux/interrupt.h>
	#include <asm/ibmebus.h>
	#include <asm/abs_addr.h>

	static struct ibmebus_dev ibmebus_bus_device = { /* fake "parent" device */
	.name = ibmebus_bus_device.ofdev.dev.bus_id,
	.ofdev.dev.bus_id = "ibmebus",
	.ofdev.dev.bus = &ibmebus_bus_type,
	};

	static void ibmebus_alloc_coherent(struct device dev,
	size_t size,
	dma_addr_t *dma_handle,
	gfp_t flag)
	{
	void *mem;

	mem = kmalloc(size, flag);
	*dma_handle = (dma_addr_t)mem;

	return mem;
	}

	static void ibmebus_free_coherent(struct device *dev,
	size_t size, void *vaddr,
	dma_addr_t dma_handle)
	{
	kfree(vaddr);
	}

	static dma_addr_t ibmebus_map_single(struct device *dev,
	void *ptr,
	size_t size,
	enum dma_data_direction direction)
	{
	return (dma_addr_t)(ptr);
	}

	static void ibmebus_unmap_single(struct device *dev,
	dma_addr_t dma_addr,
	size_t size,
	enum dma_data_direction direction)
	{
	return;
	}

	static int ibmebus_map_sg(struct device *dev,
	struct scatterlist *sg,
	int nents, enum dma_data_direction direction)
	{
	int i;

	for (i = 0; i < nents; i++) {
	sg[i].dma_address = (dma_addr_t)page_address(sg[i].page)
	+ sg[i].offset;
	sg[i].dma_length = sg[i].length;
	}

	return nents;
	}

	static void ibmebus_unmap_sg(struct device *dev,
	struct scatterlist *sg,
	int nents, enum dma_data_direction direction)
	{
	return;
	}

	static int ibmebus_dma_supported(struct device *dev, u64 mask)
	{
	return 1;
	}

	struct dma_mapping_ops ibmebus_dma_ops = {
	.alloc_coherent = ibmebus_alloc_coherent,
	.free_coherent = ibmebus_free_coherent,
	.map_single = ibmebus_map_single,
	.unmap_single = ibmebus_unmap_single,
	.map_sg = ibmebus_map_sg,
	.unmap_sg = ibmebus_unmap_sg,
	.dma_supported = ibmebus_dma_supported,
	};

	static int ibmebus_bus_probe(struct device *dev)
	{
	struct ibmebus_dev *ibmebusdev = to_ibmebus_dev(dev);
	struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver);
	const struct of_device_id *id;
	int error = -ENODEV;

	if (!ibmebusdrv->probe)
	return error;

	id = of_match_device(ibmebusdrv->id_table, &ibmebusdev->ofdev);
	if (id) {
	error = ibmebusdrv->probe(ibmebusdev, id);
	}

	return error;
	}

	static int ibmebus_bus_remove(struct device *dev)
	{
	struct ibmebus_dev *ibmebusdev = to_ibmebus_dev(dev);
	struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver);

	if (ibmebusdrv->remove) {
	return ibmebusdrv->remove(ibmebusdev);
	}

	return 0;
	}

	static void __devinit ibmebus_dev_release(struct device *dev)
	{
	of_node_put(to_ibmebus_dev(dev)->ofdev.node);
	kfree(to_ibmebus_dev(dev));
	}

	static ssize_t ibmebusdev_show_name(struct device *dev,
	struct device_attribute attr, char buf)
	{
	return sprintf(buf, "%s\n", to_ibmebus_dev(dev)->name);
	}
	static DEVICE_ATTR(name, S_IRUSR \| S_IRGRP \| S_IROTH, ibmebusdev_show_name,
	NULL);

	static struct ibmebus_dev* __devinit ibmebus_register_device_common(
	struct ibmebus_dev dev, const char name)
	{
	int err = 0;

	dev->name = name;
	dev->ofdev.dev.parent = &ibmebus_bus_device.ofdev.dev;
	dev->ofdev.dev.bus = &ibmebus_bus_type;
	dev->ofdev.dev.release = ibmebus_dev_release;

	/* An ibmebusdev is based on a of_device. We have to change the
	* bus type to use our own DMA mapping operations.
	*/
	if ((err = of_device_register(&dev->ofdev)) != 0) {
	printk(KERN_ERR "%s: failed to register device (%d).\n",
	__FUNCTION__, err);
	return NULL;
	}

	device_create_file(&dev->ofdev.dev, &dev_attr_name);

	return dev;
	}

	static struct ibmebus_dev* __devinit ibmebus_register_device_node(
	struct device_node *dn)
	{
	struct ibmebus_dev *dev;
	const char *loc_code;
	int length;

	loc_code = get_property(dn, "ibm,loc-code", NULL);
	if (!loc_code) {
	printk(KERN_WARNING "%s: node %s missing 'ibm,loc-code'\n",
	__FUNCTION__, dn->name ? dn->name : "<unknown>");
	return NULL;
	}

	if (strlen(loc_code) == 0) {
	printk(KERN_WARNING "%s: 'ibm,loc-code' is invalid\n",
	__FUNCTION__);
	return NULL;
	}

	dev = kmalloc(sizeof(struct ibmebus_dev), GFP_KERNEL);
	if (!dev) {
	return NULL;
	}
	memset(dev, 0, sizeof(struct ibmebus_dev));

	dev->ofdev.node = of_node_get(dn);

	length = strlen(loc_code);
	memcpy(dev->ofdev.dev.bus_id, loc_code
	+ (length - min(length, BUS_ID_SIZE - 1)),
	min(length, BUS_ID_SIZE - 1));

	/* Register with generic device framework. */
	if (ibmebus_register_device_common(dev, dn->name) == NULL) {
	kfree(dev);
	return NULL;
	}

	return dev;
	}

	static void ibmebus_probe_of_nodes(char* name)
	{
	struct device_node *dn = NULL;

	while ((dn = of_find_node_by_name(dn, name))) {
	if (ibmebus_register_device_node(dn) == NULL) {
	of_node_put(dn);

	return;
	}
	}

	of_node_put(dn);

	return;
	}

	static void ibmebus_add_devices_by_id(struct of_device_id *idt)
	{
	while (strlen(idt->name) > 0) {
	ibmebus_probe_of_nodes(idt->name);
	idt++;
	}

	return;
	}

	static int ibmebus_match_helper(struct device dev, void data)
	{
	if (strcmp((char*)data, to_ibmebus_dev(dev)->name) == 0)
	return 1;

	return 0;
	}

	static int ibmebus_unregister_device(struct device *dev)
	{
	device_remove_file(dev, &dev_attr_name);
	of_device_unregister(to_of_device(dev));

	return 0;
	}

	static void ibmebus_remove_devices_by_id(struct of_device_id *idt)
	{
	struct device *dev;

	while (strlen(idt->name) > 0) {
	while ((dev = bus_find_device(&ibmebus_bus_type, NULL,
	(void*)idt->name,
	ibmebus_match_helper))) {
	ibmebus_unregister_device(dev);
	}
	idt++;

	}

	return;
	}

	int ibmebus_register_driver(struct ibmebus_driver *drv)
	{
	int err = 0;

	drv->driver.name = drv->name;
	drv->driver.bus = &ibmebus_bus_type;
	drv->driver.probe = ibmebus_bus_probe;
	drv->driver.remove = ibmebus_bus_remove;

	if ((err = driver_register(&drv->driver) != 0))
	return err;

	ibmebus_add_devices_by_id(drv->id_table);

	return 0;
	}
	EXPORT_SYMBOL(ibmebus_register_driver);

	void ibmebus_unregister_driver(struct ibmebus_driver *drv)
	{
	driver_unregister(&drv->driver);
	ibmebus_remove_devices_by_id(drv->id_table);
	}
	EXPORT_SYMBOL(ibmebus_unregister_driver);

	int ibmebus_request_irq(struct ibmebus_dev *dev,
	u32 ist,
	irqreturn_t (handler)(int, void, struct pt_regs *),
	unsigned long irq_flags, const char * devname,
	void *dev_id)
	{
	unsigned int irq = irq_create_mapping(NULL, ist);

	if (irq == NO_IRQ)
	return -EINVAL;

	return request_irq(irq, handler,
	irq_flags, devname, dev_id);
	}
	EXPORT_SYMBOL(ibmebus_request_irq);

	void ibmebus_free_irq(struct ibmebus_dev dev, u32 ist, void dev_id)
	{
	unsigned int irq = irq_find_mapping(NULL, ist);

	free_irq(irq, dev_id);
	}
	EXPORT_SYMBOL(ibmebus_free_irq);

	static int ibmebus_bus_match(struct device dev, struct device_driver drv)
	{
	const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
	struct ibmebus_driver *ebus_drv = to_ibmebus_driver(drv);
	const struct of_device_id *ids = ebus_drv->id_table;
	const struct of_device_id *found_id;

	if (!ids)
	return 0;

	found_id = of_match_device(ids, &ebus_dev->ofdev);
	if (found_id)
	return 1;

	return 0;
	}

	struct bus_type ibmebus_bus_type = {
	.name = "ibmebus",
	.match = ibmebus_bus_match,
	};
	EXPORT_SYMBOL(ibmebus_bus_type);

	static int __init ibmebus_bus_init(void)
	{
	int err;

	printk(KERN_INFO "IBM eBus Device Driver\n");

	err = bus_register(&ibmebus_bus_type);
	if (err) {
	printk(KERN_ERR ":%s: failed to register IBM eBus.\n",
	__FUNCTION__);
	return err;
	}

	err = device_register(&ibmebus_bus_device.ofdev.dev);
	if (err) {
	printk(KERN_WARNING "%s: device_register returned %i\n",
	__FUNCTION__, err);
	bus_unregister(&ibmebus_bus_type);

	return err;
	}

	return 0;
	}
	__initcall(ibmebus_bus_init);