[mirror_ubuntu-artful-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_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_device_id root_device_ids[] = {
	{"PNP0A03", 0},
	{"", 0},
};
MODULE_DEVICE_TABLE(acpi, root_device_ids);

static struct acpi_driver acpi_pci_root_driver = {
	.name = "pci_root",
	.class = ACPI_PCI_ROOT_CLASS,
	.ids = root_device_ids,
	.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);

acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
{
	struct acpi_pci_root *tmp;
	
	list_for_each_entry(tmp, &acpi_pci_roots, node) {
		if ((tmp->id.segment == (u16) seg) && (tmp->id.bus == (u16) bus))
			return tmp->device->handle;
	}
	return NULL;		
}

EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);

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 void acpi_pci_bridge_scan(struct acpi_device *device)
{
	int status;
	struct acpi_device *child = NULL;

	if (device->flags.bus_address)
		if (device->parent && device->parent->ops.bind) {
			status = device->parent->ops.bind(device);
			if (!status) {
				list_for_each_entry(child, &device->children, node)
					acpi_pci_bridge_scan(child);
			}
		}
}

static int __devinit 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;
	struct acpi_device *child;


	if (!device)
		return -EINVAL;

	root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
	if (!root)
		return -ENOMEM;
	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);
	device->driver_data = root;

	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);

	/*
	 * Scan and bind all _ADR-Based Devices
	 */
	list_for_each_entry(child, &device->children, node)
		acpi_pci_bridge_scan(child);

      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
f52fd66d	39	ACPI_MODULE_NAME("pci_root");
1da177e4	40	#define ACPI_PCI_ROOT_CLASS "pci_bridge"
1da177e4	41	#define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge"
4be44fcd LB	42	static int acpi_pci_root_add(struct acpi_device *device);
	43	static int acpi_pci_root_remove(struct acpi_device *device, int type);
	44	static int acpi_pci_root_start(struct acpi_device *device);
1da177e4	45
1ba90e3a TR	46	static struct acpi_device_id root_device_ids[] = {
	47	{"PNP0A03", 0},
	48	{"", 0},
	49	};
	50	MODULE_DEVICE_TABLE(acpi, root_device_ids);
	51
1da177e4	52	static struct acpi_driver acpi_pci_root_driver = {
c2b6705b	53	.name = "pci_root",
4be44fcd	54	.class = ACPI_PCI_ROOT_CLASS,
1ba90e3a	55	.ids = root_device_ids,
4be44fcd LB	56	.ops = {
	57	.add = acpi_pci_root_add,
	58	.remove = acpi_pci_root_remove,
	59	.start = acpi_pci_root_start,
	60	},
1da177e4 LT	61	};
	62
	63	struct acpi_pci_root {
4be44fcd	64	struct list_head node;
32917e5b	65	struct acpi_device * device;
4be44fcd LB	66	struct acpi_pci_id id;
4be44fcd LB	67	struct pci_bus *bus;
1da177e4 LT	68	};
	69
	70	static LIST_HEAD(acpi_pci_roots);
	71
	72	static struct acpi_pci_driver *sub_driver;
	73
	74	int acpi_pci_register_driver(struct acpi_pci_driver *driver)
	75	{
	76	int n = 0;
	77	struct list_head *entry;
	78
	79	struct acpi_pci_driver **pptr = &sub_driver;
	80	while (*pptr)
	81	pptr = &(*pptr)->next;
	82	*pptr = driver;
	83
	84	if (!driver->add)
	85	return 0;
	86
	87	list_for_each(entry, &acpi_pci_roots) {
	88	struct acpi_pci_root *root;
	89	root = list_entry(entry, struct acpi_pci_root, node);
2d1e0a02	90	driver->add(root->device->handle);
1da177e4 LT	91	n++;
	92	}
	93
	94	return n;
	95	}
4be44fcd	96
1da177e4 LT	97	EXPORT_SYMBOL(acpi_pci_register_driver);
	98
	99	void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
	100	{
	101	struct list_head *entry;
	102
	103	struct acpi_pci_driver **pptr = &sub_driver;
	104	while (*pptr) {
f10bb254 AM	105	if (*pptr == driver)
	106	break;
	107	pptr = &(*pptr)->next;
1da177e4	108	}
f10bb254 AM	109	BUG_ON(!*pptr);
f10bb254 AM	110	pptr = (pptr)->next;
1da177e4 LT	111
	112	if (!driver->remove)
	113	return;
	114
	115	list_for_each(entry, &acpi_pci_roots) {
	116	struct acpi_pci_root *root;
	117	root = list_entry(entry, struct acpi_pci_root, node);
2d1e0a02	118	driver->remove(root->device->handle);
1da177e4 LT	119	}
1da177e4 LT	120	}
4be44fcd	121
1da177e4 LT	122	EXPORT_SYMBOL(acpi_pci_unregister_driver);
1da177e4 LT	123
d91a0078 JC	124	acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
	125	{
	126	struct acpi_pci_root *tmp;
	127
	128	list_for_each_entry(tmp, &acpi_pci_roots, node) {
	129	if ((tmp->id.segment == (u16) seg) && (tmp->id.bus == (u16) bus))
	130	return tmp->device->handle;
	131	}
	132	return NULL;
	133	}
	134
	135	EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
	136
1da177e4	137	static acpi_status
4be44fcd	138	get_root_bridge_busnr_callback(struct acpi_resource resource, void data)
1da177e4	139	{
50dd0969	140	int *busnr = data;
1da177e4 LT	141	struct acpi_resource_address64 address;
1da177e4 LT	142
50eca3eb BM	143	if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
	144	resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
	145	resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
1da177e4 LT	146	return AE_OK;
	147
	148	acpi_resource_to_address64(resource, &address);
4be44fcd LB	149	if ((address.address_length > 0) &&
4be44fcd LB	150	(address.resource_type == ACPI_BUS_NUMBER_RANGE))
50eca3eb	151	*busnr = address.minimum;
1da177e4 LT	152
	153	return AE_OK;
	154	}
	155
4be44fcd	156	static acpi_status try_get_root_bridge_busnr(acpi_handle handle, int *busnum)
1da177e4 LT	157	{
	158	acpi_status status;
	159
	160	*busnum = -1;
4be44fcd LB	161	status =
	162	acpi_walk_resources(handle, METHOD_NAME__CRS,
	163	get_root_bridge_busnr_callback, busnum);
1da177e4 LT	164	if (ACPI_FAILURE(status))
	165	return status;
	166	/* Check if we really get a bus number from _CRS */
	167	if (*busnum == -1)
	168	return AE_ERROR;
	169	return AE_OK;
	170	}
	171
2786f6e3 RZ	172	static void acpi_pci_bridge_scan(struct acpi_device *device)
	173	{
	174	int status;
	175	struct acpi_device *child = NULL;
	176
	177	if (device->flags.bus_address)
	178	if (device->parent && device->parent->ops.bind) {
	179	status = device->parent->ops.bind(device);
	180	if (!status) {
	181	list_for_each_entry(child, &device->children, node)
	182	acpi_pci_bridge_scan(child);
	183	}
	184	}
	185	}
	186
b5678a34	187	static int __devinit acpi_pci_root_add(struct acpi_device *device)
1da177e4	188	{
4be44fcd LB	189	int result = 0;
	190	struct acpi_pci_root *root = NULL;
	191	struct acpi_pci_root *tmp;
	192	acpi_status status = AE_OK;
	193	unsigned long value = 0;
	194	acpi_handle handle = NULL;
2786f6e3	195	struct acpi_device *child;
1da177e4	196
1da177e4 LT	197
1da177e4 LT	198	if (!device)
d550d98d	199	return -EINVAL;
1da177e4	200
36bcbec7	201	root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
1da177e4	202	if (!root)
d550d98d	203	return -ENOMEM;
c431ada4	204	INIT_LIST_HEAD(&root->node);
1da177e4	205
32917e5b	206	root->device = device;
1da177e4 LT	207	strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
1da177e4 LT	208	strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
db89b4f0	209	device->driver_data = root;
1da177e4	210
1da177e4 LT	211	device->ops.bind = acpi_pci_bind;
	212
	213	/*
	214	* Segment
	215	* -------
	216	* Obtained via _SEG, if exists, otherwise assumed to be zero (0).
	217	*/
2d1e0a02	218	status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
4be44fcd	219	&value);
1da177e4 LT	220	switch (status) {
	221	case AE_OK:
	222	root->id.segment = (u16) value;
	223	break;
	224	case AE_NOT_FOUND:
4be44fcd LB	225	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd LB	226	"Assuming segment 0 (no _SEG)\n"));
1da177e4 LT	227	root->id.segment = 0;
	228	break;
	229	default:
a6fc6720	230	ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SEG"));
1da177e4 LT	231	result = -ENODEV;
	232	goto end;
	233	}
	234
	235	/*
	236	* Bus
	237	* ---
	238	* Obtained via _BBN, if exists, otherwise assumed to be zero (0).
	239	*/
2d1e0a02	240	status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, NULL,
4be44fcd	241	&value);
1da177e4 LT	242	switch (status) {
	243	case AE_OK:
	244	root->id.bus = (u16) value;
	245	break;
	246	case AE_NOT_FOUND:
	247	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Assuming bus 0 (no _BBN)\n"));
	248	root->id.bus = 0;
	249	break;
	250	default:
a6fc6720	251	ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BBN"));
1da177e4 LT	252	result = -ENODEV;
	253	goto end;
	254	}
	255
	256	/* Some systems have wrong _BBN */
	257	list_for_each_entry(tmp, &acpi_pci_roots, node) {
	258	if ((tmp->id.segment == root->id.segment)
4be44fcd	259	&& (tmp->id.bus == root->id.bus)) {
1da177e4 LT	260	int bus = 0;
	261	acpi_status status;
	262
6468463a	263	printk(KERN_ERR PREFIX
a6fc6720	264	"Wrong _BBN value, reboot"
6468463a	265	" and use option 'pci=noacpi'\n");
1da177e4	266
2d1e0a02	267	status = try_get_root_bridge_busnr(device->handle, &bus);
1da177e4 LT	268	if (ACPI_FAILURE(status))
	269	break;
	270	if (bus != root->id.bus) {
4be44fcd LB	271	printk(KERN_INFO PREFIX
4be44fcd LB	272	"PCI _CRS %d overrides _BBN 0\n", bus);
1da177e4 LT	273	root->id.bus = bus;
	274	}
	275	break;
	276	}
	277	}
	278	/*
	279	* Device & Function
	280	* -----------------
	281	* Obtained from _ADR (which has already been evaluated for us).
	282	*/
	283	root->id.device = device->pnp.bus_address >> 16;
	284	root->id.function = device->pnp.bus_address & 0xFFFF;
	285
	286	/*
	287	* TBD: Need PCI interface for enumeration/configuration of roots.
	288	*/
	289
4be44fcd LB	290	/* TBD: Locking */
4be44fcd LB	291	list_add_tail(&root->node, &acpi_pci_roots);
1da177e4	292
4be44fcd LB	293	printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n",
	294	acpi_device_name(device), acpi_device_bid(device),
	295	root->id.segment, root->id.bus);
1da177e4 LT	296
	297	/*
	298	* Scan the Root Bridge
	299	* --------------------
	300	* Must do this prior to any attempt to bind the root device, as the
	301	* PCI namespace does not get created until this call is made (and
	302	* thus the root bridge's pci_dev does not exist).
	303	*/
	304	root->bus = pci_acpi_scan_root(device, root->id.segment, root->id.bus);
	305	if (!root->bus) {
6468463a LB	306	printk(KERN_ERR PREFIX
	307	"Bus %04x:%02x not present in PCI namespace\n",
	308	root->id.segment, root->id.bus);
1da177e4 LT	309	result = -ENODEV;
	310	goto end;
	311	}
	312
	313	/*
	314	* Attach ACPI-PCI Context
	315	* -----------------------
	316	* Thus binding the ACPI and PCI devices.
	317	*/
	318	result = acpi_pci_bind_root(device, &root->id, root->bus);
	319	if (result)
	320	goto end;
	321
	322	/*
	323	* PCI Routing Table
	324	* -----------------
	325	* Evaluate and parse _PRT, if exists.
	326	*/
2d1e0a02	327	status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
1da177e4	328	if (ACPI_SUCCESS(status))
2d1e0a02	329	result = acpi_pci_irq_add_prt(device->handle, root->id.segment,
4be44fcd	330	root->id.bus);
1da177e4	331
2786f6e3 RZ	332	/*
	333	* Scan and bind all _ADR-Based Devices
	334	*/
	335	list_for_each_entry(child, &device->children, node)
	336	acpi_pci_bridge_scan(child);
	337
4be44fcd	338	end:
c431ada4 RS	339	if (result) {
	340	if (!list_empty(&root->node))
	341	list_del(&root->node);
1da177e4	342	kfree(root);
c431ada4	343	}
1da177e4	344
d550d98d	345	return result;
1da177e4 LT	346	}
1da177e4 LT	347
4be44fcd	348	static int acpi_pci_root_start(struct acpi_device *device)
c431ada4	349	{
4be44fcd	350	struct acpi_pci_root *root;
c431ada4	351
c431ada4 RS	352
c431ada4 RS	353	list_for_each_entry(root, &acpi_pci_roots, node) {
432bfaba	354	if (root->device == device) {
c431ada4	355	pci_bus_add_devices(root->bus);
d550d98d	356	return 0;
c431ada4 RS	357	}
c431ada4 RS	358	}
d550d98d	359	return -ENODEV;
c431ada4	360	}
1da177e4	361
4be44fcd	362	static int acpi_pci_root_remove(struct acpi_device *device, int type)
1da177e4	363	{
4be44fcd	364	struct acpi_pci_root *root = NULL;
1da177e4	365
1da177e4 LT	366
1da177e4 LT	367	if (!device \|\| !acpi_driver_data(device))
d550d98d	368	return -EINVAL;
1da177e4	369
50dd0969	370	root = acpi_driver_data(device);
1da177e4 LT	371
	372	kfree(root);
	373
d550d98d	374	return 0;
1da177e4 LT	375	}
1da177e4 LT	376
4be44fcd	377	static int __init acpi_pci_root_init(void)
1da177e4	378	{
1da177e4 LT	379
1da177e4 LT	380	if (acpi_pci_disabled)
d550d98d	381	return 0;
1da177e4 LT	382
1da177e4 LT	383	/* DEBUG:
4be44fcd LB	384	acpi_dbg_layer = ACPI_PCI_COMPONENT;
4be44fcd LB	385	acpi_dbg_level = 0xFFFFFFFF;
1da177e4 LT	386	*/
	387
	388	if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
d550d98d	389	return -ENODEV;
1da177e4	390
d550d98d	391	return 0;
1da177e4 LT	392	}
	393
	394	subsys_initcall(acpi_pci_root_init);