[mirror_ubuntu-zesty-kernel.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;
	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->device->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->device->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->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;

	/* 
	 * Segment
	 * -------
	 * Obtained via _SEG, if exists, otherwise assumed to be zero (0).
	 */
	status = acpi_evaluate_integer(device->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(device->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(device->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(device->handle, METHOD_NAME__PRT, &handle);
	if (ACPI_SUCCESS(status))
		result = acpi_pci_irq_add_prt(device->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->device == device) {
			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	60	struct list_head node;
32917e5b	61	struct acpi_device * device;
4be44fcd LB	62	struct acpi_pci_id id;
4be44fcd LB	63	struct pci_bus *bus;
1da177e4 LT	64	};
	65
	66	static LIST_HEAD(acpi_pci_roots);
	67
	68	static struct acpi_pci_driver *sub_driver;
	69
	70	int acpi_pci_register_driver(struct acpi_pci_driver *driver)
	71	{
	72	int n = 0;
	73	struct list_head *entry;
	74
	75	struct acpi_pci_driver **pptr = &sub_driver;
	76	while (*pptr)
	77	pptr = &(*pptr)->next;
	78	*pptr = driver;
	79
	80	if (!driver->add)
	81	return 0;
	82
	83	list_for_each(entry, &acpi_pci_roots) {
	84	struct acpi_pci_root *root;
	85	root = list_entry(entry, struct acpi_pci_root, node);
2d1e0a02	86	driver->add(root->device->handle);
1da177e4 LT	87	n++;
	88	}
	89
	90	return n;
	91	}
4be44fcd	92
1da177e4 LT	93	EXPORT_SYMBOL(acpi_pci_register_driver);
	94
	95	void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
	96	{
	97	struct list_head *entry;
	98
	99	struct acpi_pci_driver **pptr = &sub_driver;
	100	while (*pptr) {
	101	if (*pptr != driver)
	102	continue;
	103	pptr = (pptr)->next;
	104	break;
	105	}
	106
	107	if (!driver->remove)
	108	return;
	109
	110	list_for_each(entry, &acpi_pci_roots) {
	111	struct acpi_pci_root *root;
	112	root = list_entry(entry, struct acpi_pci_root, node);
2d1e0a02	113	driver->remove(root->device->handle);
1da177e4 LT	114	}
1da177e4 LT	115	}
4be44fcd	116
1da177e4 LT	117	EXPORT_SYMBOL(acpi_pci_unregister_driver);
	118
	119	static acpi_status
4be44fcd	120	get_root_bridge_busnr_callback(struct acpi_resource resource, void data)
1da177e4 LT	121	{
	122	int busnr = (int )data;
	123	struct acpi_resource_address64 address;
	124
50eca3eb BM	125	if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
	126	resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
	127	resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
1da177e4 LT	128	return AE_OK;
	129
	130	acpi_resource_to_address64(resource, &address);
4be44fcd LB	131	if ((address.address_length > 0) &&
4be44fcd LB	132	(address.resource_type == ACPI_BUS_NUMBER_RANGE))
50eca3eb	133	*busnr = address.minimum;
1da177e4 LT	134
	135	return AE_OK;
	136	}
	137
4be44fcd	138	static acpi_status try_get_root_bridge_busnr(acpi_handle handle, int *busnum)
1da177e4 LT	139	{
	140	acpi_status status;
	141
	142	*busnum = -1;
4be44fcd LB	143	status =
	144	acpi_walk_resources(handle, METHOD_NAME__CRS,
	145	get_root_bridge_busnr_callback, busnum);
1da177e4 LT	146	if (ACPI_FAILURE(status))
	147	return status;
	148	/* Check if we really get a bus number from _CRS */
	149	if (*busnum == -1)
	150	return AE_ERROR;
	151	return AE_OK;
	152	}
	153
4be44fcd	154	static int acpi_pci_root_add(struct acpi_device *device)
1da177e4	155	{
4be44fcd LB	156	int result = 0;
	157	struct acpi_pci_root *root = NULL;
	158	struct acpi_pci_root *tmp;
	159	acpi_status status = AE_OK;
	160	unsigned long value = 0;
	161	acpi_handle handle = NULL;
1da177e4	162
1da177e4 LT	163
1da177e4 LT	164	if (!device)
d550d98d	165	return -EINVAL;
1da177e4 LT	166
	167	root = kmalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
	168	if (!root)
d550d98d	169	return -ENOMEM;
1da177e4	170	memset(root, 0, sizeof(struct acpi_pci_root));
c431ada4	171	INIT_LIST_HEAD(&root->node);
1da177e4	172
32917e5b	173	root->device = device;
1da177e4 LT	174	strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
	175	strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
	176	acpi_driver_data(device) = root;
	177
1da177e4 LT	178	/*
	179	* Segment
	180	* -------
	181	* Obtained via _SEG, if exists, otherwise assumed to be zero (0).
	182	*/
2d1e0a02	183	status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
4be44fcd	184	&value);
1da177e4 LT	185	switch (status) {
	186	case AE_OK:
	187	root->id.segment = (u16) value;
	188	break;
	189	case AE_NOT_FOUND:
4be44fcd LB	190	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd LB	191	"Assuming segment 0 (no _SEG)\n"));
1da177e4 LT	192	root->id.segment = 0;
	193	break;
	194	default:
a6fc6720	195	ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SEG"));
1da177e4 LT	196	result = -ENODEV;
	197	goto end;
	198	}
	199
	200	/*
	201	* Bus
	202	* ---
	203	* Obtained via _BBN, if exists, otherwise assumed to be zero (0).
	204	*/
2d1e0a02	205	status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, NULL,
4be44fcd	206	&value);
1da177e4 LT	207	switch (status) {
	208	case AE_OK:
	209	root->id.bus = (u16) value;
	210	break;
	211	case AE_NOT_FOUND:
	212	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Assuming bus 0 (no _BBN)\n"));
	213	root->id.bus = 0;
	214	break;
	215	default:
a6fc6720	216	ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BBN"));
1da177e4 LT	217	result = -ENODEV;
	218	goto end;
	219	}
	220
	221	/* Some systems have wrong _BBN */
	222	list_for_each_entry(tmp, &acpi_pci_roots, node) {
	223	if ((tmp->id.segment == root->id.segment)
4be44fcd	224	&& (tmp->id.bus == root->id.bus)) {
1da177e4 LT	225	int bus = 0;
	226	acpi_status status;
	227
6468463a	228	printk(KERN_ERR PREFIX
a6fc6720	229	"Wrong _BBN value, reboot"
6468463a	230	" and use option 'pci=noacpi'\n");
1da177e4	231
2d1e0a02	232	status = try_get_root_bridge_busnr(device->handle, &bus);
1da177e4 LT	233	if (ACPI_FAILURE(status))
	234	break;
	235	if (bus != root->id.bus) {
4be44fcd LB	236	printk(KERN_INFO PREFIX
4be44fcd LB	237	"PCI _CRS %d overrides _BBN 0\n", bus);
1da177e4 LT	238	root->id.bus = bus;
	239	}
	240	break;
	241	}
	242	}
	243	/*
	244	* Device & Function
	245	* -----------------
	246	* Obtained from _ADR (which has already been evaluated for us).
	247	*/
	248	root->id.device = device->pnp.bus_address >> 16;
	249	root->id.function = device->pnp.bus_address & 0xFFFF;
	250
	251	/*
	252	* TBD: Need PCI interface for enumeration/configuration of roots.
	253	*/
	254
4be44fcd LB	255	/* TBD: Locking */
4be44fcd LB	256	list_add_tail(&root->node, &acpi_pci_roots);
1da177e4	257
4be44fcd LB	258	printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n",
	259	acpi_device_name(device), acpi_device_bid(device),
	260	root->id.segment, root->id.bus);
1da177e4 LT	261
	262	/*
	263	* Scan the Root Bridge
	264	* --------------------
	265	* Must do this prior to any attempt to bind the root device, as the
	266	* PCI namespace does not get created until this call is made (and
	267	* thus the root bridge's pci_dev does not exist).
	268	*/
	269	root->bus = pci_acpi_scan_root(device, root->id.segment, root->id.bus);
	270	if (!root->bus) {
6468463a LB	271	printk(KERN_ERR PREFIX
	272	"Bus %04x:%02x not present in PCI namespace\n",
	273	root->id.segment, root->id.bus);
1da177e4 LT	274	result = -ENODEV;
	275	goto end;
	276	}
	277
	278	/*
	279	* Attach ACPI-PCI Context
	280	* -----------------------
	281	* Thus binding the ACPI and PCI devices.
	282	*/
	283	result = acpi_pci_bind_root(device, &root->id, root->bus);
	284	if (result)
	285	goto end;
	286
	287	/*
	288	* PCI Routing Table
	289	* -----------------
	290	* Evaluate and parse _PRT, if exists.
	291	*/
2d1e0a02	292	status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
1da177e4	293	if (ACPI_SUCCESS(status))
2d1e0a02	294	result = acpi_pci_irq_add_prt(device->handle, root->id.segment,
4be44fcd	295	root->id.bus);
1da177e4	296
4be44fcd	297	end:
c431ada4 RS	298	if (result) {
	299	if (!list_empty(&root->node))
	300	list_del(&root->node);
1da177e4	301	kfree(root);
c431ada4	302	}
1da177e4	303
d550d98d	304	return result;
1da177e4 LT	305	}
1da177e4 LT	306
4be44fcd	307	static int acpi_pci_root_start(struct acpi_device *device)
c431ada4	308	{
4be44fcd	309	struct acpi_pci_root *root;
c431ada4	310
c431ada4 RS	311
c431ada4 RS	312	list_for_each_entry(root, &acpi_pci_roots, node) {
432bfaba	313	if (root->device == device) {
c431ada4	314	pci_bus_add_devices(root->bus);
d550d98d	315	return 0;
c431ada4 RS	316	}
c431ada4 RS	317	}
d550d98d	318	return -ENODEV;
c431ada4	319	}
1da177e4	320
4be44fcd	321	static int acpi_pci_root_remove(struct acpi_device *device, int type)
1da177e4	322	{
4be44fcd	323	struct acpi_pci_root *root = NULL;
1da177e4	324
1da177e4 LT	325
1da177e4 LT	326	if (!device \|\| !acpi_driver_data(device))
d550d98d	327	return -EINVAL;
1da177e4	328
4be44fcd	329	root = (struct acpi_pci_root *)acpi_driver_data(device);
1da177e4 LT	330
	331	kfree(root);
	332
d550d98d	333	return 0;
1da177e4 LT	334	}
1da177e4 LT	335
4be44fcd	336	static int __init acpi_pci_root_init(void)
1da177e4	337	{
1da177e4 LT	338
1da177e4 LT	339	if (acpi_pci_disabled)
d550d98d	340	return 0;
1da177e4 LT	341
1da177e4 LT	342	/* DEBUG:
4be44fcd LB	343	acpi_dbg_layer = ACPI_PCI_COMPONENT;
4be44fcd LB	344	acpi_dbg_level = 0xFFFFFFFF;
1da177e4 LT	345	*/
	346
	347	if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
d550d98d	348	return -ENODEV;
1da177e4	349
d550d98d	350	return 0;
1da177e4 LT	351	}
	352
	353	subsys_initcall(acpi_pci_root_init);