[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/pci-acpi.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 long value = 0;
	acpi_handle handle = NULL;
	struct acpi_device *child;
	u32 flags, base_flags;


	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;

	/*
	 * All supported architectures that use ACPI have support for
	 * PCI domains, so we indicate this in _OSC support capabilities.
	 */
	flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
	pci_acpi_osc_support(device->handle, flags);

	/* 
	 * 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);

	/* Indicate support for various _OSC capabilities. */
	if (pci_ext_cfg_avail(root->bus->self))
		flags |= OSC_EXT_PCI_CONFIG_SUPPORT;
	if (pcie_aspm_enabled())
		flags |= OSC_ACTIVE_STATE_PWR_SUPPORT |
			OSC_CLOCK_PWR_CAPABILITY_SUPPORT;
	if (pci_msi_enabled())
		flags |= OSC_MSI_SUPPORT;
	if (flags != base_flags)
		pci_acpi_osc_support(device->handle, flags);

      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;

	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>
990a7ac5	34	#include <linux/pci-acpi.h>
1da177e4 LT	35	#include <linux/acpi.h>
	36	#include <acpi/acpi_bus.h>
	37	#include <acpi/acpi_drivers.h>
	38
1da177e4	39	#define _COMPONENT ACPI_PCI_COMPONENT
f52fd66d	40	ACPI_MODULE_NAME("pci_root");
1da177e4	41	#define ACPI_PCI_ROOT_CLASS "pci_bridge"
1da177e4	42	#define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge"
4be44fcd LB	43	static int acpi_pci_root_add(struct acpi_device *device);
	44	static int acpi_pci_root_remove(struct acpi_device *device, int type);
	45	static int acpi_pci_root_start(struct acpi_device *device);
1da177e4	46
1ba90e3a TR	47	static struct acpi_device_id root_device_ids[] = {
	48	{"PNP0A03", 0},
	49	{"", 0},
	50	};
	51	MODULE_DEVICE_TABLE(acpi, root_device_ids);
	52
1da177e4	53	static struct acpi_driver acpi_pci_root_driver = {
c2b6705b	54	.name = "pci_root",
4be44fcd	55	.class = ACPI_PCI_ROOT_CLASS,
1ba90e3a	56	.ids = root_device_ids,
4be44fcd LB	57	.ops = {
	58	.add = acpi_pci_root_add,
	59	.remove = acpi_pci_root_remove,
	60	.start = acpi_pci_root_start,
	61	},
1da177e4 LT	62	};
	63
	64	struct acpi_pci_root {
4be44fcd	65	struct list_head node;
32917e5b	66	struct acpi_device * device;
4be44fcd LB	67	struct acpi_pci_id id;
4be44fcd LB	68	struct pci_bus *bus;
1da177e4 LT	69	};
	70
	71	static LIST_HEAD(acpi_pci_roots);
	72
	73	static struct acpi_pci_driver *sub_driver;
	74
	75	int acpi_pci_register_driver(struct acpi_pci_driver *driver)
	76	{
	77	int n = 0;
	78	struct list_head *entry;
	79
	80	struct acpi_pci_driver **pptr = &sub_driver;
	81	while (*pptr)
	82	pptr = &(*pptr)->next;
	83	*pptr = driver;
	84
	85	if (!driver->add)
	86	return 0;
	87
	88	list_for_each(entry, &acpi_pci_roots) {
	89	struct acpi_pci_root *root;
	90	root = list_entry(entry, struct acpi_pci_root, node);
2d1e0a02	91	driver->add(root->device->handle);
1da177e4 LT	92	n++;
	93	}
	94
	95	return n;
	96	}
4be44fcd	97
1da177e4 LT	98	EXPORT_SYMBOL(acpi_pci_register_driver);
	99
	100	void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
	101	{
	102	struct list_head *entry;
	103
	104	struct acpi_pci_driver **pptr = &sub_driver;
	105	while (*pptr) {
f10bb254 AM	106	if (*pptr == driver)
	107	break;
	108	pptr = &(*pptr)->next;
1da177e4	109	}
f10bb254 AM	110	BUG_ON(!*pptr);
f10bb254 AM	111	pptr = (pptr)->next;
1da177e4 LT	112
	113	if (!driver->remove)
	114	return;
	115
	116	list_for_each(entry, &acpi_pci_roots) {
	117	struct acpi_pci_root *root;
	118	root = list_entry(entry, struct acpi_pci_root, node);
2d1e0a02	119	driver->remove(root->device->handle);
1da177e4 LT	120	}
1da177e4 LT	121	}
4be44fcd	122
1da177e4 LT	123	EXPORT_SYMBOL(acpi_pci_unregister_driver);
1da177e4 LT	124
d91a0078 JC	125	acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
	126	{
	127	struct acpi_pci_root *tmp;
	128
	129	list_for_each_entry(tmp, &acpi_pci_roots, node) {
	130	if ((tmp->id.segment == (u16) seg) && (tmp->id.bus == (u16) bus))
	131	return tmp->device->handle;
	132	}
	133	return NULL;
	134	}
	135
	136	EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
	137
1da177e4	138	static acpi_status
4be44fcd	139	get_root_bridge_busnr_callback(struct acpi_resource resource, void data)
1da177e4	140	{
50dd0969	141	int *busnr = data;
1da177e4 LT	142	struct acpi_resource_address64 address;
1da177e4 LT	143
50eca3eb BM	144	if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
	145	resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
	146	resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
1da177e4 LT	147	return AE_OK;
	148
	149	acpi_resource_to_address64(resource, &address);
4be44fcd LB	150	if ((address.address_length > 0) &&
4be44fcd LB	151	(address.resource_type == ACPI_BUS_NUMBER_RANGE))
50eca3eb	152	*busnr = address.minimum;
1da177e4 LT	153
	154	return AE_OK;
	155	}
	156
4be44fcd	157	static acpi_status try_get_root_bridge_busnr(acpi_handle handle, int *busnum)
1da177e4 LT	158	{
	159	acpi_status status;
	160
	161	*busnum = -1;
4be44fcd LB	162	status =
	163	acpi_walk_resources(handle, METHOD_NAME__CRS,
	164	get_root_bridge_busnr_callback, busnum);
1da177e4 LT	165	if (ACPI_FAILURE(status))
	166	return status;
	167	/* Check if we really get a bus number from _CRS */
	168	if (*busnum == -1)
	169	return AE_ERROR;
	170	return AE_OK;
	171	}
	172
2786f6e3 RZ	173	static void acpi_pci_bridge_scan(struct acpi_device *device)
	174	{
	175	int status;
	176	struct acpi_device *child = NULL;
	177
	178	if (device->flags.bus_address)
	179	if (device->parent && device->parent->ops.bind) {
	180	status = device->parent->ops.bind(device);
	181	if (!status) {
	182	list_for_each_entry(child, &device->children, node)
	183	acpi_pci_bridge_scan(child);
	184	}
	185	}
	186	}
	187
b5678a34	188	static int __devinit acpi_pci_root_add(struct acpi_device *device)
1da177e4	189	{
4be44fcd LB	190	int result = 0;
	191	struct acpi_pci_root *root = NULL;
	192	struct acpi_pci_root *tmp;
	193	acpi_status status = AE_OK;
27663c58	194	unsigned long long value = 0;
4be44fcd	195	acpi_handle handle = NULL;
2786f6e3	196	struct acpi_device *child;
0ef5f8f6	197	u32 flags, base_flags;
1da177e4	198
1da177e4 LT	199
1da177e4 LT	200	if (!device)
d550d98d	201	return -EINVAL;
1da177e4	202
36bcbec7	203	root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
1da177e4	204	if (!root)
d550d98d	205	return -ENOMEM;
c431ada4	206	INIT_LIST_HEAD(&root->node);
1da177e4	207
32917e5b	208	root->device = device;
1da177e4 LT	209	strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
1da177e4 LT	210	strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
db89b4f0	211	device->driver_data = root;
1da177e4	212
1da177e4 LT	213	device->ops.bind = acpi_pci_bind;
1da177e4 LT	214
990a7ac5 AP	215	/*
	216	* All supported architectures that use ACPI have support for
	217	* PCI domains, so we indicate this in _OSC support capabilities.
	218	*/
0ef5f8f6	219	flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
990a7ac5 AP	220	pci_acpi_osc_support(device->handle, flags);
990a7ac5 AP	221
1da177e4 LT	222	/*
	223	* Segment
	224	* -------
	225	* Obtained via _SEG, if exists, otherwise assumed to be zero (0).
	226	*/
2d1e0a02	227	status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
4be44fcd	228	&value);
1da177e4 LT	229	switch (status) {
	230	case AE_OK:
	231	root->id.segment = (u16) value;
	232	break;
	233	case AE_NOT_FOUND:
4be44fcd LB	234	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd LB	235	"Assuming segment 0 (no _SEG)\n"));
1da177e4 LT	236	root->id.segment = 0;
	237	break;
	238	default:
a6fc6720	239	ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SEG"));
1da177e4 LT	240	result = -ENODEV;
	241	goto end;
	242	}
	243
	244	/*
	245	* Bus
	246	* ---
	247	* Obtained via _BBN, if exists, otherwise assumed to be zero (0).
	248	*/
2d1e0a02	249	status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, NULL,
4be44fcd	250	&value);
1da177e4 LT	251	switch (status) {
	252	case AE_OK:
	253	root->id.bus = (u16) value;
	254	break;
	255	case AE_NOT_FOUND:
	256	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Assuming bus 0 (no _BBN)\n"));
	257	root->id.bus = 0;
	258	break;
	259	default:
a6fc6720	260	ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BBN"));
1da177e4 LT	261	result = -ENODEV;
	262	goto end;
	263	}
	264
	265	/* Some systems have wrong _BBN */
	266	list_for_each_entry(tmp, &acpi_pci_roots, node) {
	267	if ((tmp->id.segment == root->id.segment)
4be44fcd	268	&& (tmp->id.bus == root->id.bus)) {
1da177e4 LT	269	int bus = 0;
	270	acpi_status status;
	271
6468463a	272	printk(KERN_ERR PREFIX
a6fc6720	273	"Wrong _BBN value, reboot"
6468463a	274	" and use option 'pci=noacpi'\n");
1da177e4	275
2d1e0a02	276	status = try_get_root_bridge_busnr(device->handle, &bus);
1da177e4 LT	277	if (ACPI_FAILURE(status))
	278	break;
	279	if (bus != root->id.bus) {
4be44fcd LB	280	printk(KERN_INFO PREFIX
4be44fcd LB	281	"PCI _CRS %d overrides _BBN 0\n", bus);
1da177e4 LT	282	root->id.bus = bus;
	283	}
	284	break;
	285	}
	286	}
	287	/*
	288	* Device & Function
	289	* -----------------
	290	* Obtained from _ADR (which has already been evaluated for us).
	291	*/
	292	root->id.device = device->pnp.bus_address >> 16;
	293	root->id.function = device->pnp.bus_address & 0xFFFF;
	294
	295	/*
	296	* TBD: Need PCI interface for enumeration/configuration of roots.
	297	*/
	298
4be44fcd LB	299	/* TBD: Locking */
4be44fcd LB	300	list_add_tail(&root->node, &acpi_pci_roots);
1da177e4	301
4be44fcd LB	302	printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n",
	303	acpi_device_name(device), acpi_device_bid(device),
	304	root->id.segment, root->id.bus);
1da177e4 LT	305
	306	/*
	307	* Scan the Root Bridge
	308	* --------------------
	309	* Must do this prior to any attempt to bind the root device, as the
	310	* PCI namespace does not get created until this call is made (and
	311	* thus the root bridge's pci_dev does not exist).
	312	*/
	313	root->bus = pci_acpi_scan_root(device, root->id.segment, root->id.bus);
	314	if (!root->bus) {
6468463a LB	315	printk(KERN_ERR PREFIX
	316	"Bus %04x:%02x not present in PCI namespace\n",
	317	root->id.segment, root->id.bus);
1da177e4 LT	318	result = -ENODEV;
	319	goto end;
	320	}
	321
	322	/*
	323	* Attach ACPI-PCI Context
	324	* -----------------------
	325	* Thus binding the ACPI and PCI devices.
	326	*/
	327	result = acpi_pci_bind_root(device, &root->id, root->bus);
	328	if (result)
	329	goto end;
	330
	331	/*
	332	* PCI Routing Table
	333	* -----------------
	334	* Evaluate and parse _PRT, if exists.
	335	*/
2d1e0a02	336	status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
1da177e4	337	if (ACPI_SUCCESS(status))
2d1e0a02	338	result = acpi_pci_irq_add_prt(device->handle, root->id.segment,
4be44fcd	339	root->id.bus);
1da177e4	340
2786f6e3 RZ	341	/*
	342	* Scan and bind all _ADR-Based Devices
	343	*/
	344	list_for_each_entry(child, &device->children, node)
	345	acpi_pci_bridge_scan(child);
	346
0ef5f8f6 AP	347	/* Indicate support for various _OSC capabilities. */
	348	if (pci_ext_cfg_avail(root->bus->self))
	349	flags \|= OSC_EXT_PCI_CONFIG_SUPPORT;
3e1b1600 AP	350	if (pcie_aspm_enabled())
	351	flags \|= OSC_ACTIVE_STATE_PWR_SUPPORT \|
	352	OSC_CLOCK_PWR_CAPABILITY_SUPPORT;
07ae95f9 AP	353	if (pci_msi_enabled())
07ae95f9 AP	354	flags \|= OSC_MSI_SUPPORT;
0ef5f8f6 AP	355	if (flags != base_flags)
	356	pci_acpi_osc_support(device->handle, flags);
	357
4be44fcd	358	end:
c431ada4 RS	359	if (result) {
	360	if (!list_empty(&root->node))
	361	list_del(&root->node);
1da177e4	362	kfree(root);
c431ada4	363	}
1da177e4	364
d550d98d	365	return result;
1da177e4 LT	366	}
1da177e4 LT	367
4be44fcd	368	static int acpi_pci_root_start(struct acpi_device *device)
c431ada4	369	{
4be44fcd	370	struct acpi_pci_root *root;
c431ada4	371
c431ada4 RS	372
c431ada4 RS	373	list_for_each_entry(root, &acpi_pci_roots, node) {
432bfaba	374	if (root->device == device) {
c431ada4	375	pci_bus_add_devices(root->bus);
d550d98d	376	return 0;
c431ada4 RS	377	}
c431ada4 RS	378	}
d550d98d	379	return -ENODEV;
c431ada4	380	}
1da177e4	381
4be44fcd	382	static int acpi_pci_root_remove(struct acpi_device *device, int type)
1da177e4	383	{
4be44fcd	384	struct acpi_pci_root *root = NULL;
1da177e4	385
1da177e4 LT	386
1da177e4 LT	387	if (!device \|\| !acpi_driver_data(device))
d550d98d	388	return -EINVAL;
1da177e4	389
50dd0969	390	root = acpi_driver_data(device);
1da177e4 LT	391
	392	kfree(root);
	393
d550d98d	394	return 0;
1da177e4 LT	395	}
1da177e4 LT	396
4be44fcd	397	static int __init acpi_pci_root_init(void)
1da177e4	398	{
1da177e4	399	if (acpi_pci_disabled)
d550d98d	400	return 0;
1da177e4	401
1da177e4	402	if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
d550d98d	403	return -ENODEV;
1da177e4	404
d550d98d	405	return 0;
1da177e4 LT	406	}
	407
	408	subsys_initcall(acpi_pci_root_init);