[linux-2.6-block.git] / drivers / acpi / pci_root.c

/*
 *  pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $)
 *
 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.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.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/spinlock.h>
#include <linux/pm.h>
#include <linux/pci.h>
#include <linux/acpi.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#define _COMPONENT		ACPI_PCI_COMPONENT
ACPI_MODULE_NAME("pci_root")
#define ACPI_PCI_ROOT_CLASS		"pci_bridge"
#define ACPI_PCI_ROOT_HID		"PNP0A03"
#define ACPI_PCI_ROOT_DRIVER_NAME	"ACPI PCI Root Bridge Driver"
#define ACPI_PCI_ROOT_DEVICE_NAME	"PCI Root Bridge"
static int acpi_pci_root_add(struct acpi_device *device);
static int acpi_pci_root_remove(struct acpi_device *device, int type);
static int acpi_pci_root_start(struct acpi_device *device);

static struct acpi_driver acpi_pci_root_driver = {
	.name = ACPI_PCI_ROOT_DRIVER_NAME,
	.class = ACPI_PCI_ROOT_CLASS,
	.ids = ACPI_PCI_ROOT_HID,
	.ops = {
		.add = acpi_pci_root_add,
		.remove = acpi_pci_root_remove,
		.start = acpi_pci_root_start,
		},
};

struct acpi_pci_root {
	struct list_head node;
	acpi_handle handle;
	struct acpi_device * device;
	struct acpi_pci_id id;
	struct pci_bus *bus;
};

static LIST_HEAD(acpi_pci_roots);

static struct acpi_pci_driver *sub_driver;

int acpi_pci_register_driver(struct acpi_pci_driver *driver)
{
	int n = 0;
	struct list_head *entry;

	struct acpi_pci_driver **pptr = &sub_driver;
	while (*pptr)
		pptr = &(*pptr)->next;
	*pptr = driver;

	if (!driver->add)
		return 0;

	list_for_each(entry, &acpi_pci_roots) {
		struct acpi_pci_root *root;
		root = list_entry(entry, struct acpi_pci_root, node);
		driver->add(root->handle);
		n++;
	}

	return n;
}

EXPORT_SYMBOL(acpi_pci_register_driver);

void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
{
	struct list_head *entry;

	struct acpi_pci_driver **pptr = &sub_driver;
	while (*pptr) {
		if (*pptr != driver)
			continue;
		*pptr = (*pptr)->next;
		break;
	}

	if (!driver->remove)
		return;

	list_for_each(entry, &acpi_pci_roots) {
		struct acpi_pci_root *root;
		root = list_entry(entry, struct acpi_pci_root, node);
		driver->remove(root->handle);
	}
}

EXPORT_SYMBOL(acpi_pci_unregister_driver);

static acpi_status
get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
{
	int *busnr = (int *)data;
	struct acpi_resource_address64 address;

	if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
	    resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
	    resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
		return AE_OK;

	acpi_resource_to_address64(resource, &address);
	if ((address.address_length > 0) &&
	    (address.resource_type == ACPI_BUS_NUMBER_RANGE))
		*busnr = address.minimum;

	return AE_OK;
}

static acpi_status try_get_root_bridge_busnr(acpi_handle handle, int *busnum)
{
	acpi_status status;

	*busnum = -1;
	status =
	    acpi_walk_resources(handle, METHOD_NAME__CRS,
				get_root_bridge_busnr_callback, busnum);
	if (ACPI_FAILURE(status))
		return status;
	/* Check if we really get a bus number from _CRS */
	if (*busnum == -1)
		return AE_ERROR;
	return AE_OK;
}

static int acpi_pci_root_add(struct acpi_device *device)
{
	int result = 0;
	struct acpi_pci_root *root = NULL;
	struct acpi_pci_root *tmp;
	acpi_status status = AE_OK;
	unsigned long value = 0;
	acpi_handle handle = NULL;


	if (!device)
		return -EINVAL;

	root = kmalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
	if (!root)
		return -ENOMEM;
	memset(root, 0, sizeof(struct acpi_pci_root));
	INIT_LIST_HEAD(&root->node);

	root->handle = device->handle;
	root->device = device;
	strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
	strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
	acpi_driver_data(device) = root;

	/*
	 * TBD: Doesn't the bus driver automatically set this?
	 */
	device->ops.bind = acpi_pci_bind;

	/* 
	 * Segment
	 * -------
	 * Obtained via _SEG, if exists, otherwise assumed to be zero (0).
	 */
	status = acpi_evaluate_integer(root->handle, METHOD_NAME__SEG, NULL,
				       &value);
	switch (status) {
	case AE_OK:
		root->id.segment = (u16) value;
		break;
	case AE_NOT_FOUND:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "Assuming segment 0 (no _SEG)\n"));
		root->id.segment = 0;
		break;
	default:
		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SEG"));
		result = -ENODEV;
		goto end;
	}

	/* 
	 * Bus
	 * ---
	 * Obtained via _BBN, if exists, otherwise assumed to be zero (0).
	 */
	status = acpi_evaluate_integer(root->handle, METHOD_NAME__BBN, NULL,
				       &value);
	switch (status) {
	case AE_OK:
		root->id.bus = (u16) value;
		break;
	case AE_NOT_FOUND:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Assuming bus 0 (no _BBN)\n"));
		root->id.bus = 0;
		break;
	default:
		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BBN"));
		result = -ENODEV;
		goto end;
	}

	/* Some systems have wrong _BBN */
	list_for_each_entry(tmp, &acpi_pci_roots, node) {
		if ((tmp->id.segment == root->id.segment)
		    && (tmp->id.bus == root->id.bus)) {
			int bus = 0;
			acpi_status status;

			printk(KERN_ERR PREFIX
				    "Wrong _BBN value, reboot"
				    " and use option 'pci=noacpi'\n");

			status = try_get_root_bridge_busnr(root->handle, &bus);
			if (ACPI_FAILURE(status))
				break;
			if (bus != root->id.bus) {
				printk(KERN_INFO PREFIX
				       "PCI _CRS %d overrides _BBN 0\n", bus);
				root->id.bus = bus;
			}
			break;
		}
	}
	/*
	 * Device & Function
	 * -----------------
	 * Obtained from _ADR (which has already been evaluated for us).
	 */
	root->id.device = device->pnp.bus_address >> 16;
	root->id.function = device->pnp.bus_address & 0xFFFF;

	/*
	 * TBD: Need PCI interface for enumeration/configuration of roots.
	 */

	/* TBD: Locking */
	list_add_tail(&root->node, &acpi_pci_roots);

	printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n",
	       acpi_device_name(device), acpi_device_bid(device),
	       root->id.segment, root->id.bus);

	/*
	 * Scan the Root Bridge
	 * --------------------
	 * Must do this prior to any attempt to bind the root device, as the
	 * PCI namespace does not get created until this call is made (and 
	 * thus the root bridge's pci_dev does not exist).
	 */
	root->bus = pci_acpi_scan_root(device, root->id.segment, root->id.bus);
	if (!root->bus) {
		printk(KERN_ERR PREFIX
			    "Bus %04x:%02x not present in PCI namespace\n",
			    root->id.segment, root->id.bus);
		result = -ENODEV;
		goto end;
	}

	/*
	 * Attach ACPI-PCI Context
	 * -----------------------
	 * Thus binding the ACPI and PCI devices.
	 */
	result = acpi_pci_bind_root(device, &root->id, root->bus);
	if (result)
		goto end;

	/*
	 * PCI Routing Table
	 * -----------------
	 * Evaluate and parse _PRT, if exists.
	 */
	status = acpi_get_handle(root->handle, METHOD_NAME__PRT, &handle);
	if (ACPI_SUCCESS(status))
		result = acpi_pci_irq_add_prt(root->handle, root->id.segment,
					      root->id.bus);

      end:
	if (result) {
		if (!list_empty(&root->node))
			list_del(&root->node);
		kfree(root);
	}

	return result;
}

static int acpi_pci_root_start(struct acpi_device *device)
{
	struct acpi_pci_root *root;


	list_for_each_entry(root, &acpi_pci_roots, node) {
		if (root->handle == device->handle) {
			pci_bus_add_devices(root->bus);
			return 0;
		}
	}
	return -ENODEV;
}

static int acpi_pci_root_remove(struct acpi_device *device, int type)
{
	struct acpi_pci_root *root = NULL;


	if (!device || !acpi_driver_data(device))
		return -EINVAL;

	root = (struct acpi_pci_root *)acpi_driver_data(device);

	kfree(root);

	return 0;
}

static int __init acpi_pci_root_init(void)
{

	if (acpi_pci_disabled)
		return 0;

	/* DEBUG:
	   acpi_dbg_layer = ACPI_PCI_COMPONENT;
	   acpi_dbg_level = 0xFFFFFFFF;
	 */

	if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
		return -ENODEV;

	return 0;
}

subsys_initcall(acpi_pci_root_init);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $)
	3	*
	4	* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
	5	* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
	6	*
	7	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or (at
	12	* your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful, but
	15	* WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License along
	20	* with this program; if not, write to the Free Software Foundation, Inc.,
	21	* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
	22	*
	23	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	24	*/
	25
	26	#include <linux/kernel.h>
	27	#include <linux/module.h>
	28	#include <linux/init.h>
	29	#include <linux/types.h>
	30	#include <linux/proc_fs.h>
	31	#include <linux/spinlock.h>
	32	#include <linux/pm.h>
	33	#include <linux/pci.h>
	34	#include <linux/acpi.h>
	35	#include <acpi/acpi_bus.h>
	36	#include <acpi/acpi_drivers.h>
	37
1da177e4	38	#define _COMPONENT ACPI_PCI_COMPONENT
4be44fcd	39	ACPI_MODULE_NAME("pci_root")
1da177e4 LT	40	#define ACPI_PCI_ROOT_CLASS "pci_bridge"
	41	#define ACPI_PCI_ROOT_HID "PNP0A03"
	42	#define ACPI_PCI_ROOT_DRIVER_NAME "ACPI PCI Root Bridge Driver"
	43	#define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge"
4be44fcd LB	44	static int acpi_pci_root_add(struct acpi_device *device);
	45	static int acpi_pci_root_remove(struct acpi_device *device, int type);
	46	static int acpi_pci_root_start(struct acpi_device *device);
1da177e4 LT	47
1da177e4 LT	48	static struct acpi_driver acpi_pci_root_driver = {
4be44fcd LB	49	.name = ACPI_PCI_ROOT_DRIVER_NAME,
	50	.class = ACPI_PCI_ROOT_CLASS,
	51	.ids = ACPI_PCI_ROOT_HID,
	52	.ops = {
	53	.add = acpi_pci_root_add,
	54	.remove = acpi_pci_root_remove,
	55	.start = acpi_pci_root_start,
	56	},
1da177e4 LT	57	};
	58
	59	struct acpi_pci_root {
4be44fcd LB	60	struct list_head node;
4be44fcd LB	61	acpi_handle handle;
32917e5b	62	struct acpi_device * device;
4be44fcd LB	63	struct acpi_pci_id id;
4be44fcd LB	64	struct pci_bus *bus;
1da177e4 LT	65	};
	66
	67	static LIST_HEAD(acpi_pci_roots);
	68
	69	static struct acpi_pci_driver *sub_driver;
	70
	71	int acpi_pci_register_driver(struct acpi_pci_driver *driver)
	72	{
	73	int n = 0;
	74	struct list_head *entry;
	75
	76	struct acpi_pci_driver **pptr = &sub_driver;
	77	while (*pptr)
	78	pptr = &(*pptr)->next;
	79	*pptr = driver;
	80
	81	if (!driver->add)
	82	return 0;
	83
	84	list_for_each(entry, &acpi_pci_roots) {
	85	struct acpi_pci_root *root;
	86	root = list_entry(entry, struct acpi_pci_root, node);
	87	driver->add(root->handle);
	88	n++;
	89	}
	90
	91	return n;
	92	}
4be44fcd	93
1da177e4 LT	94	EXPORT_SYMBOL(acpi_pci_register_driver);
	95
	96	void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
	97	{
	98	struct list_head *entry;
	99
	100	struct acpi_pci_driver **pptr = &sub_driver;
	101	while (*pptr) {
	102	if (*pptr != driver)
	103	continue;
	104	pptr = (pptr)->next;
	105	break;
	106	}
	107
	108	if (!driver->remove)
	109	return;
	110
	111	list_for_each(entry, &acpi_pci_roots) {
	112	struct acpi_pci_root *root;
	113	root = list_entry(entry, struct acpi_pci_root, node);
	114	driver->remove(root->handle);
	115	}
	116	}
4be44fcd	117
1da177e4 LT	118	EXPORT_SYMBOL(acpi_pci_unregister_driver);
	119
	120	static acpi_status
4be44fcd	121	get_root_bridge_busnr_callback(struct acpi_resource resource, void data)
1da177e4 LT	122	{
	123	int busnr = (int )data;
	124	struct acpi_resource_address64 address;
	125
50eca3eb BM	126	if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
	127	resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
	128	resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
1da177e4 LT	129	return AE_OK;
	130
	131	acpi_resource_to_address64(resource, &address);
4be44fcd LB	132	if ((address.address_length > 0) &&
4be44fcd LB	133	(address.resource_type == ACPI_BUS_NUMBER_RANGE))
50eca3eb	134	*busnr = address.minimum;
1da177e4 LT	135
	136	return AE_OK;
	137	}
	138
4be44fcd	139	static acpi_status try_get_root_bridge_busnr(acpi_handle handle, int *busnum)
1da177e4 LT	140	{
	141	acpi_status status;
	142
	143	*busnum = -1;
4be44fcd LB	144	status =
	145	acpi_walk_resources(handle, METHOD_NAME__CRS,
	146	get_root_bridge_busnr_callback, busnum);
1da177e4 LT	147	if (ACPI_FAILURE(status))
	148	return status;
	149	/* Check if we really get a bus number from _CRS */
	150	if (*busnum == -1)
	151	return AE_ERROR;
	152	return AE_OK;
	153	}
	154
4be44fcd	155	static int acpi_pci_root_add(struct acpi_device *device)
1da177e4	156	{
4be44fcd LB	157	int result = 0;
	158	struct acpi_pci_root *root = NULL;
	159	struct acpi_pci_root *tmp;
	160	acpi_status status = AE_OK;
	161	unsigned long value = 0;
	162	acpi_handle handle = NULL;
1da177e4	163
1da177e4 LT	164
1da177e4 LT	165	if (!device)
d550d98d	166	return -EINVAL;
1da177e4 LT	167
	168	root = kmalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
	169	if (!root)
d550d98d	170	return -ENOMEM;
1da177e4	171	memset(root, 0, sizeof(struct acpi_pci_root));
c431ada4	172	INIT_LIST_HEAD(&root->node);
1da177e4 LT	173
1da177e4 LT	174	root->handle = device->handle;
32917e5b	175	root->device = device;
1da177e4 LT	176	strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
	177	strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
	178	acpi_driver_data(device) = root;
	179
	180	/*
	181	* TBD: Doesn't the bus driver automatically set this?
	182	*/
	183	device->ops.bind = acpi_pci_bind;
	184
	185	/*
	186	* Segment
	187	* -------
	188	* Obtained via _SEG, if exists, otherwise assumed to be zero (0).
	189	*/
4be44fcd LB	190	status = acpi_evaluate_integer(root->handle, METHOD_NAME__SEG, NULL,
4be44fcd LB	191	&value);
1da177e4 LT	192	switch (status) {
	193	case AE_OK:
	194	root->id.segment = (u16) value;
	195	break;
	196	case AE_NOT_FOUND:
4be44fcd LB	197	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd LB	198	"Assuming segment 0 (no _SEG)\n"));
1da177e4 LT	199	root->id.segment = 0;
	200	break;
	201	default:
a6fc6720	202	ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SEG"));
1da177e4 LT	203	result = -ENODEV;
	204	goto end;
	205	}
	206
	207	/*
	208	* Bus
	209	* ---
	210	* Obtained via _BBN, if exists, otherwise assumed to be zero (0).
	211	*/
4be44fcd LB	212	status = acpi_evaluate_integer(root->handle, METHOD_NAME__BBN, NULL,
4be44fcd LB	213	&value);
1da177e4 LT	214	switch (status) {
	215	case AE_OK:
	216	root->id.bus = (u16) value;
	217	break;
	218	case AE_NOT_FOUND:
	219	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Assuming bus 0 (no _BBN)\n"));
	220	root->id.bus = 0;
	221	break;
	222	default:
a6fc6720	223	ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BBN"));
1da177e4 LT	224	result = -ENODEV;
	225	goto end;
	226	}
	227
	228	/* Some systems have wrong _BBN */
	229	list_for_each_entry(tmp, &acpi_pci_roots, node) {
	230	if ((tmp->id.segment == root->id.segment)
4be44fcd	231	&& (tmp->id.bus == root->id.bus)) {
1da177e4 LT	232	int bus = 0;
	233	acpi_status status;
	234
6468463a	235	printk(KERN_ERR PREFIX
a6fc6720	236	"Wrong _BBN value, reboot"
6468463a	237	" and use option 'pci=noacpi'\n");
1da177e4 LT	238
	239	status = try_get_root_bridge_busnr(root->handle, &bus);
	240	if (ACPI_FAILURE(status))
	241	break;
	242	if (bus != root->id.bus) {
4be44fcd LB	243	printk(KERN_INFO PREFIX
4be44fcd LB	244	"PCI _CRS %d overrides _BBN 0\n", bus);
1da177e4 LT	245	root->id.bus = bus;
	246	}
	247	break;
	248	}
	249	}
	250	/*
	251	* Device & Function
	252	* -----------------
	253	* Obtained from _ADR (which has already been evaluated for us).
	254	*/
	255	root->id.device = device->pnp.bus_address >> 16;
	256	root->id.function = device->pnp.bus_address & 0xFFFF;
	257
	258	/*
	259	* TBD: Need PCI interface for enumeration/configuration of roots.
	260	*/
	261
4be44fcd LB	262	/* TBD: Locking */
4be44fcd LB	263	list_add_tail(&root->node, &acpi_pci_roots);
1da177e4	264
4be44fcd LB	265	printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n",
	266	acpi_device_name(device), acpi_device_bid(device),
	267	root->id.segment, root->id.bus);
1da177e4 LT	268
	269	/*
	270	* Scan the Root Bridge
	271	* --------------------
	272	* Must do this prior to any attempt to bind the root device, as the
	273	* PCI namespace does not get created until this call is made (and
	274	* thus the root bridge's pci_dev does not exist).
	275	*/
	276	root->bus = pci_acpi_scan_root(device, root->id.segment, root->id.bus);
	277	if (!root->bus) {
6468463a LB	278	printk(KERN_ERR PREFIX
	279	"Bus %04x:%02x not present in PCI namespace\n",
	280	root->id.segment, root->id.bus);
1da177e4 LT	281	result = -ENODEV;
	282	goto end;
	283	}
	284
	285	/*
	286	* Attach ACPI-PCI Context
	287	* -----------------------
	288	* Thus binding the ACPI and PCI devices.
	289	*/
	290	result = acpi_pci_bind_root(device, &root->id, root->bus);
	291	if (result)
	292	goto end;
	293
	294	/*
	295	* PCI Routing Table
	296	* -----------------
	297	* Evaluate and parse _PRT, if exists.
	298	*/
	299	status = acpi_get_handle(root->handle, METHOD_NAME__PRT, &handle);
	300	if (ACPI_SUCCESS(status))
	301	result = acpi_pci_irq_add_prt(root->handle, root->id.segment,
4be44fcd	302	root->id.bus);
1da177e4	303
4be44fcd	304	end:
c431ada4 RS	305	if (result) {
	306	if (!list_empty(&root->node))
	307	list_del(&root->node);
1da177e4	308	kfree(root);
c431ada4	309	}
1da177e4	310
d550d98d	311	return result;
1da177e4 LT	312	}
1da177e4 LT	313
4be44fcd	314	static int acpi_pci_root_start(struct acpi_device *device)
c431ada4	315	{
4be44fcd	316	struct acpi_pci_root *root;
c431ada4	317
c431ada4 RS	318
	319	list_for_each_entry(root, &acpi_pci_roots, node) {
	320	if (root->handle == device->handle) {
	321	pci_bus_add_devices(root->bus);
d550d98d	322	return 0;
c431ada4 RS	323	}
c431ada4 RS	324	}
d550d98d	325	return -ENODEV;
c431ada4	326	}
1da177e4	327
4be44fcd	328	static int acpi_pci_root_remove(struct acpi_device *device, int type)
1da177e4	329	{
4be44fcd	330	struct acpi_pci_root *root = NULL;
1da177e4	331
1da177e4 LT	332
1da177e4 LT	333	if (!device \|\| !acpi_driver_data(device))
d550d98d	334	return -EINVAL;
1da177e4	335
4be44fcd	336	root = (struct acpi_pci_root *)acpi_driver_data(device);
1da177e4 LT	337
	338	kfree(root);
	339
d550d98d	340	return 0;
1da177e4 LT	341	}
1da177e4 LT	342
4be44fcd	343	static int __init acpi_pci_root_init(void)
1da177e4	344	{
1da177e4 LT	345
1da177e4 LT	346	if (acpi_pci_disabled)
d550d98d	347	return 0;
1da177e4 LT	348
1da177e4 LT	349	/* DEBUG:
4be44fcd LB	350	acpi_dbg_layer = ACPI_PCI_COMPONENT;
4be44fcd LB	351	acpi_dbg_level = 0xFFFFFFFF;
1da177e4 LT	352	*/
	353
	354	if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
d550d98d	355	return -ENODEV;
1da177e4	356
d550d98d	357	return 0;
1da177e4 LT	358	}
	359
	360	subsys_initcall(acpi_pci_root_init);