[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;
	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)
			break;
		pptr = &(*pptr)->next;
	}
	BUG_ON(!*pptr);
	*pptr = (*pptr)->next;

	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 = 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;

	/*
	 * 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(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 = 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) {
f10bb254 AM	101	if (*pptr == driver)
	102	break;
	103	pptr = &(*pptr)->next;
1da177e4	104	}
f10bb254 AM	105	BUG_ON(!*pptr);
f10bb254 AM	106	pptr = (pptr)->next;
1da177e4 LT	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);
2d1e0a02	114	driver->remove(root->device->handle);
1da177e4 LT	115	}
1da177e4 LT	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	122	{
50dd0969	123	int *busnr = data;
1da177e4 LT	124	struct acpi_resource_address64 address;
1da177e4 LT	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	173
32917e5b	174	root->device = device;
1da177e4 LT	175	strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
	176	strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
	177	acpi_driver_data(device) = root;
	178
	179	/*
	180	* TBD: Doesn't the bus driver automatically set this?
	181	*/
	182	device->ops.bind = acpi_pci_bind;
	183
	184	/*
	185	* Segment
	186	* -------
	187	* Obtained via _SEG, if exists, otherwise assumed to be zero (0).
	188	*/
2d1e0a02	189	status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
4be44fcd	190	&value);
1da177e4 LT	191	switch (status) {
	192	case AE_OK:
	193	root->id.segment = (u16) value;
	194	break;
	195	case AE_NOT_FOUND:
4be44fcd LB	196	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd LB	197	"Assuming segment 0 (no _SEG)\n"));
1da177e4 LT	198	root->id.segment = 0;
	199	break;
	200	default:
a6fc6720	201	ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SEG"));
1da177e4 LT	202	result = -ENODEV;
	203	goto end;
	204	}
	205
	206	/*
	207	* Bus
	208	* ---
	209	* Obtained via _BBN, if exists, otherwise assumed to be zero (0).
	210	*/
2d1e0a02	211	status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, NULL,
4be44fcd	212	&value);
1da177e4 LT	213	switch (status) {
	214	case AE_OK:
	215	root->id.bus = (u16) value;
	216	break;
	217	case AE_NOT_FOUND:
	218	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Assuming bus 0 (no _BBN)\n"));
	219	root->id.bus = 0;
	220	break;
	221	default:
a6fc6720	222	ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BBN"));
1da177e4 LT	223	result = -ENODEV;
	224	goto end;
	225	}
	226
	227	/* Some systems have wrong _BBN */
	228	list_for_each_entry(tmp, &acpi_pci_roots, node) {
	229	if ((tmp->id.segment == root->id.segment)
4be44fcd	230	&& (tmp->id.bus == root->id.bus)) {
1da177e4 LT	231	int bus = 0;
	232	acpi_status status;
	233
6468463a	234	printk(KERN_ERR PREFIX
a6fc6720	235	"Wrong _BBN value, reboot"
6468463a	236	" and use option 'pci=noacpi'\n");
1da177e4	237
2d1e0a02	238	status = try_get_root_bridge_busnr(device->handle, &bus);
1da177e4 LT	239	if (ACPI_FAILURE(status))
	240	break;
	241	if (bus != root->id.bus) {
4be44fcd LB	242	printk(KERN_INFO PREFIX
4be44fcd LB	243	"PCI _CRS %d overrides _BBN 0\n", bus);
1da177e4 LT	244	root->id.bus = bus;
	245	}
	246	break;
	247	}
	248	}
	249	/*
	250	* Device & Function
	251	* -----------------
	252	* Obtained from _ADR (which has already been evaluated for us).
	253	*/
	254	root->id.device = device->pnp.bus_address >> 16;
	255	root->id.function = device->pnp.bus_address & 0xFFFF;
	256
	257	/*
	258	* TBD: Need PCI interface for enumeration/configuration of roots.
	259	*/
	260
4be44fcd LB	261	/* TBD: Locking */
4be44fcd LB	262	list_add_tail(&root->node, &acpi_pci_roots);
1da177e4	263
4be44fcd LB	264	printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n",
	265	acpi_device_name(device), acpi_device_bid(device),
	266	root->id.segment, root->id.bus);
1da177e4 LT	267
	268	/*
	269	* Scan the Root Bridge
	270	* --------------------
	271	* Must do this prior to any attempt to bind the root device, as the
	272	* PCI namespace does not get created until this call is made (and
	273	* thus the root bridge's pci_dev does not exist).
	274	*/
	275	root->bus = pci_acpi_scan_root(device, root->id.segment, root->id.bus);
	276	if (!root->bus) {
6468463a LB	277	printk(KERN_ERR PREFIX
	278	"Bus %04x:%02x not present in PCI namespace\n",
	279	root->id.segment, root->id.bus);
1da177e4 LT	280	result = -ENODEV;
	281	goto end;
	282	}
	283
	284	/*
	285	* Attach ACPI-PCI Context
	286	* -----------------------
	287	* Thus binding the ACPI and PCI devices.
	288	*/
	289	result = acpi_pci_bind_root(device, &root->id, root->bus);
	290	if (result)
	291	goto end;
	292
	293	/*
	294	* PCI Routing Table
	295	* -----------------
	296	* Evaluate and parse _PRT, if exists.
	297	*/
2d1e0a02	298	status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
1da177e4	299	if (ACPI_SUCCESS(status))
2d1e0a02	300	result = acpi_pci_irq_add_prt(device->handle, root->id.segment,
4be44fcd	301	root->id.bus);
1da177e4	302
4be44fcd	303	end:
c431ada4 RS	304	if (result) {
	305	if (!list_empty(&root->node))
	306	list_del(&root->node);
1da177e4	307	kfree(root);
c431ada4	308	}
1da177e4	309
d550d98d	310	return result;
1da177e4 LT	311	}
1da177e4 LT	312
4be44fcd	313	static int acpi_pci_root_start(struct acpi_device *device)
c431ada4	314	{
4be44fcd	315	struct acpi_pci_root *root;
c431ada4	316
c431ada4 RS	317
c431ada4 RS	318	list_for_each_entry(root, &acpi_pci_roots, node) {
432bfaba	319	if (root->device == device) {
c431ada4	320	pci_bus_add_devices(root->bus);
d550d98d	321	return 0;
c431ada4 RS	322	}
c431ada4 RS	323	}
d550d98d	324	return -ENODEV;
c431ada4	325	}
1da177e4	326
4be44fcd	327	static int acpi_pci_root_remove(struct acpi_device *device, int type)
1da177e4	328	{
4be44fcd	329	struct acpi_pci_root *root = NULL;
1da177e4	330
1da177e4 LT	331
1da177e4 LT	332	if (!device \|\| !acpi_driver_data(device))
d550d98d	333	return -EINVAL;
1da177e4	334
50dd0969	335	root = acpi_driver_data(device);
1da177e4 LT	336
	337	kfree(root);
	338
d550d98d	339	return 0;
1da177e4 LT	340	}
1da177e4 LT	341
4be44fcd	342	static int __init acpi_pci_root_init(void)
1da177e4	343	{
1da177e4 LT	344
1da177e4 LT	345	if (acpi_pci_disabled)
d550d98d	346	return 0;
1da177e4 LT	347
1da177e4 LT	348	/* DEBUG:
4be44fcd LB	349	acpi_dbg_layer = ACPI_PCI_COMPONENT;
4be44fcd LB	350	acpi_dbg_level = 0xFFFFFFFF;
1da177e4 LT	351	*/
	352
	353	if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
d550d98d	354	return -ENODEV;
1da177e4	355
d550d98d	356	return 0;
1da177e4 LT	357	}
	358
	359	subsys_initcall(acpi_pci_root_init);