blob: 1f67057af2a571991481bb761d157320b9d3f329 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Rafael J. Wysockib67ea762010-02-17 23:44:09 +010033#include <linux/pm_runtime.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/pci.h>
Andrew Patterson990a7ac2008-11-10 15:30:45 -070035#include <linux/pci-acpi.h>
Matthew Garrett852972a2010-06-22 11:25:43 -040036#include <linux/pci-aspm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <linux/acpi.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090038#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <acpi/acpi_bus.h>
40#include <acpi/acpi_drivers.h>
41
Len Browna192a952009-07-28 16:45:54 -040042#define PREFIX "ACPI: "
43
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#define _COMPONENT ACPI_PCI_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050045ACPI_MODULE_NAME("pci_root");
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#define ACPI_PCI_ROOT_CLASS "pci_bridge"
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge"
Len Brown4be44fc2005-08-05 00:44:28 -040048static int acpi_pci_root_add(struct acpi_device *device);
49static int acpi_pci_root_remove(struct acpi_device *device, int type);
50static int acpi_pci_root_start(struct acpi_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Márton Némethc97adf92010-01-10 17:15:36 +010052static const struct acpi_device_id root_device_ids[] = {
Thomas Renninger1ba90e32007-07-23 14:44:41 +020053 {"PNP0A03", 0},
54 {"", 0},
55};
56MODULE_DEVICE_TABLE(acpi, root_device_ids);
57
Linus Torvalds1da177e2005-04-16 15:20:36 -070058static struct acpi_driver acpi_pci_root_driver = {
Len Brownc2b67052007-02-12 23:33:40 -050059 .name = "pci_root",
Len Brown4be44fc2005-08-05 00:44:28 -040060 .class = ACPI_PCI_ROOT_CLASS,
Thomas Renninger1ba90e32007-07-23 14:44:41 +020061 .ids = root_device_ids,
Len Brown4be44fc2005-08-05 00:44:28 -040062 .ops = {
63 .add = acpi_pci_root_add,
64 .remove = acpi_pci_root_remove,
65 .start = acpi_pci_root_start,
66 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070067};
68
Linus Torvalds1da177e2005-04-16 15:20:36 -070069static LIST_HEAD(acpi_pci_roots);
70
71static struct acpi_pci_driver *sub_driver;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +090072static DEFINE_MUTEX(osc_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
74int acpi_pci_register_driver(struct acpi_pci_driver *driver)
75{
76 int n = 0;
Bjorn Helgaasc1aec832009-06-18 14:47:02 -060077 struct acpi_pci_root *root;
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
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
Bjorn Helgaasc1aec832009-06-18 14:47:02 -060087 list_for_each_entry(root, &acpi_pci_roots, node) {
Patrick Mochel2d1e0a02006-05-19 16:54:43 -040088 driver->add(root->device->handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 n++;
90 }
91
92 return n;
93}
Len Brown4be44fc2005-08-05 00:44:28 -040094
Linus Torvalds1da177e2005-04-16 15:20:36 -070095EXPORT_SYMBOL(acpi_pci_register_driver);
96
97void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
98{
Bjorn Helgaasc1aec832009-06-18 14:47:02 -060099 struct acpi_pci_root *root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
101 struct acpi_pci_driver **pptr = &sub_driver;
102 while (*pptr) {
Akinobu Mitaf10bb252006-12-19 12:56:09 -0800103 if (*pptr == driver)
104 break;
105 pptr = &(*pptr)->next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 }
Akinobu Mitaf10bb252006-12-19 12:56:09 -0800107 BUG_ON(!*pptr);
108 *pptr = (*pptr)->next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
110 if (!driver->remove)
111 return;
112
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600113 list_for_each_entry(root, &acpi_pci_roots, node)
Patrick Mochel2d1e0a02006-05-19 16:54:43 -0400114 driver->remove(root->device->handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115}
Len Brown4be44fc2005-08-05 00:44:28 -0400116
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117EXPORT_SYMBOL(acpi_pci_unregister_driver);
118
Justin Chend91a0072006-12-06 10:17:10 -0700119acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
120{
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600121 struct acpi_pci_root *root;
Justin Chend91a0072006-12-06 10:17:10 -0700122
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600123 list_for_each_entry(root, &acpi_pci_roots, node)
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700124 if ((root->segment == (u16) seg) &&
125 (root->secondary.start == (u16) bus))
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600126 return root->device->handle;
Justin Chend91a0072006-12-06 10:17:10 -0700127 return NULL;
128}
129
130EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
131
Alexander Chiang27558202009-06-10 19:55:14 +0000132/**
133 * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
134 * @handle - the ACPI CA node in question.
135 *
136 * Note: we could make this API take a struct acpi_device * instead, but
137 * for now, it's more convenient to operate on an acpi_handle.
138 */
139int acpi_is_root_bridge(acpi_handle handle)
140{
141 int ret;
142 struct acpi_device *device;
143
144 ret = acpi_bus_get_device(handle, &device);
145 if (ret)
146 return 0;
147
148 ret = acpi_match_device_ids(device, root_device_ids);
149 if (ret)
150 return 0;
151 else
152 return 1;
153}
154EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
155
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156static acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400157get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158{
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700159 struct resource *res = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 struct acpi_resource_address64 address;
161
Bob Moore50eca3e2005-09-30 19:03:00 -0400162 if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
163 resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
164 resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 return AE_OK;
166
167 acpi_resource_to_address64(resource, &address);
Len Brown4be44fc2005-08-05 00:44:28 -0400168 if ((address.address_length > 0) &&
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700169 (address.resource_type == ACPI_BUS_NUMBER_RANGE)) {
170 res->start = address.minimum;
171 res->end = address.minimum + address.address_length - 1;
172 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
174 return AE_OK;
175}
176
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600177static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700178 struct resource *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179{
180 acpi_status status;
181
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700182 res->start = -1;
Len Brown4be44fc2005-08-05 00:44:28 -0400183 status =
184 acpi_walk_resources(handle, METHOD_NAME__CRS,
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700185 get_root_bridge_busnr_callback, res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 if (ACPI_FAILURE(status))
187 return status;
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700188 if (res->start == -1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 return AE_ERROR;
190 return AE_OK;
191}
192
Rui Zhang2786f6e2006-12-21 02:21:13 -0500193static void acpi_pci_bridge_scan(struct acpi_device *device)
194{
195 int status;
196 struct acpi_device *child = NULL;
197
198 if (device->flags.bus_address)
199 if (device->parent && device->parent->ops.bind) {
200 status = device->parent->ops.bind(device);
201 if (!status) {
202 list_for_each_entry(child, &device->children, node)
203 acpi_pci_bridge_scan(child);
204 }
205 }
206}
207
Shaohua Li3a9622d2009-10-29 11:04:50 +0800208static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900209
210static acpi_status acpi_pci_run_osc(acpi_handle handle,
211 const u32 *capbuf, u32 *retval)
212{
Shaohua Li3a9622d2009-10-29 11:04:50 +0800213 struct acpi_osc_context context = {
214 .uuid_str = pci_osc_uuid_str,
215 .rev = 1,
216 .cap.length = 12,
217 .cap.pointer = (void *)capbuf,
218 };
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900219 acpi_status status;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900220
Shaohua Li3a9622d2009-10-29 11:04:50 +0800221 status = acpi_run_osc(handle, &context);
222 if (ACPI_SUCCESS(status)) {
223 *retval = *((u32 *)(context.ret.pointer + 8));
224 kfree(context.ret.pointer);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900225 }
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900226 return status;
227}
228
229static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, u32 flags)
230{
231 acpi_status status;
232 u32 support_set, result, capbuf[3];
233
234 /* do _OSC query for all possible controls */
Shaohua Li3a9622d2009-10-29 11:04:50 +0800235 support_set = root->osc_support_set | (flags & OSC_PCI_SUPPORT_MASKS);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900236 capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
237 capbuf[OSC_SUPPORT_TYPE] = support_set;
Shaohua Li3a9622d2009-10-29 11:04:50 +0800238 capbuf[OSC_CONTROL_TYPE] = OSC_PCI_CONTROL_MASKS;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900239
240 status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
241 if (ACPI_SUCCESS(status)) {
242 root->osc_support_set = support_set;
243 root->osc_control_qry = result;
244 root->osc_queried = 1;
245 }
246 return status;
247}
248
249static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
250{
251 acpi_status status;
252 acpi_handle tmp;
253
254 status = acpi_get_handle(root->device->handle, "_OSC", &tmp);
255 if (ACPI_FAILURE(status))
256 return status;
257 mutex_lock(&osc_lock);
258 status = acpi_pci_query_osc(root, flags);
259 mutex_unlock(&osc_lock);
260 return status;
261}
262
Alex Chiang76d56de2009-07-23 17:03:00 -0600263struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900264{
265 struct acpi_pci_root *root;
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600266
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900267 list_for_each_entry(root, &acpi_pci_roots, node) {
268 if (root->device->handle == handle)
269 return root;
270 }
271 return NULL;
272}
Alex Chiang76d56de2009-07-23 17:03:00 -0600273EXPORT_SYMBOL_GPL(acpi_pci_find_root);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900274
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000275struct acpi_handle_node {
276 struct list_head node;
277 acpi_handle handle;
278};
279
280/**
281 * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev
282 * @handle: the handle in question
283 *
284 * Given an ACPI CA handle, the desired PCI device is located in the
285 * list of PCI devices.
286 *
287 * If the device is found, its reference count is increased and this
288 * function returns a pointer to its data structure. The caller must
289 * decrement the reference count by calling pci_dev_put().
290 * If no device is found, %NULL is returned.
291 */
292struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
293{
294 int dev, fn;
295 unsigned long long adr;
296 acpi_status status;
297 acpi_handle phandle;
298 struct pci_bus *pbus;
299 struct pci_dev *pdev = NULL;
300 struct acpi_handle_node *node, *tmp;
301 struct acpi_pci_root *root;
302 LIST_HEAD(device_list);
303
304 /*
305 * Walk up the ACPI CA namespace until we reach a PCI root bridge.
306 */
307 phandle = handle;
308 while (!acpi_is_root_bridge(phandle)) {
309 node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL);
310 if (!node)
311 goto out;
312
313 INIT_LIST_HEAD(&node->node);
314 node->handle = phandle;
315 list_add(&node->node, &device_list);
316
317 status = acpi_get_parent(phandle, &phandle);
318 if (ACPI_FAILURE(status))
319 goto out;
320 }
321
322 root = acpi_pci_find_root(phandle);
323 if (!root)
324 goto out;
325
326 pbus = root->bus;
327
328 /*
329 * Now, walk back down the PCI device tree until we return to our
330 * original handle. Assumes that everything between the PCI root
331 * bridge and the device we're looking for must be a P2P bridge.
332 */
333 list_for_each_entry(node, &device_list, node) {
334 acpi_handle hnd = node->handle;
335 status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr);
336 if (ACPI_FAILURE(status))
337 goto out;
338 dev = (adr >> 16) & 0xffff;
339 fn = adr & 0xffff;
340
341 pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn));
Troy Moure412af972009-06-25 17:05:35 -0600342 if (!pdev || hnd == handle)
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000343 break;
344
345 pbus = pdev->subordinate;
346 pci_dev_put(pdev);
Rafael J. Wysocki497fb542009-10-13 01:01:57 +0200347
348 /*
349 * This function may be called for a non-PCI device that has a
350 * PCI parent (eg. a disk under a PCI SATA controller). In that
351 * case pdev->subordinate will be NULL for the parent.
352 */
353 if (!pbus) {
354 dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n");
355 pdev = NULL;
356 break;
357 }
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000358 }
359out:
360 list_for_each_entry_safe(node, tmp, &device_list, node)
361 kfree(node);
362
363 return pdev;
364}
365EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
366
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900367/**
Kenji Kaneshige9f5404d2009-02-09 16:00:04 +0900368 * acpi_pci_osc_control_set - commit requested control to Firmware
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900369 * @handle: acpi_handle for the target ACPI object
370 * @flags: driver's requested control bits
371 *
372 * Attempt to take control from Firmware on requested control bits.
373 **/
Kenji Kaneshige9f5404d2009-02-09 16:00:04 +0900374acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 flags)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900375{
376 acpi_status status;
377 u32 control_req, result, capbuf[3];
378 acpi_handle tmp;
379 struct acpi_pci_root *root;
380
381 status = acpi_get_handle(handle, "_OSC", &tmp);
382 if (ACPI_FAILURE(status))
383 return status;
384
Shaohua Li3a9622d2009-10-29 11:04:50 +0800385 control_req = (flags & OSC_PCI_CONTROL_MASKS);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900386 if (!control_req)
387 return AE_TYPE;
388
389 root = acpi_pci_find_root(handle);
390 if (!root)
391 return AE_NOT_EXIST;
392
393 mutex_lock(&osc_lock);
394 /* No need to evaluate _OSC if the control was already granted. */
395 if ((root->osc_control_set & control_req) == control_req)
396 goto out;
397
398 /* Need to query controls first before requesting them */
399 if (!root->osc_queried) {
400 status = acpi_pci_query_osc(root, root->osc_support_set);
401 if (ACPI_FAILURE(status))
402 goto out;
403 }
404 if ((root->osc_control_qry & control_req) != control_req) {
405 printk(KERN_DEBUG
406 "Firmware did not grant requested _OSC control\n");
407 status = AE_SUPPORT;
408 goto out;
409 }
410
411 capbuf[OSC_QUERY_TYPE] = 0;
412 capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set;
413 capbuf[OSC_CONTROL_TYPE] = root->osc_control_set | control_req;
414 status = acpi_pci_run_osc(handle, capbuf, &result);
415 if (ACPI_SUCCESS(status))
416 root->osc_control_set = result;
417out:
418 mutex_unlock(&osc_lock);
419 return status;
420}
Kenji Kaneshige9f5404d2009-02-09 16:00:04 +0900421EXPORT_SYMBOL(acpi_pci_osc_control_set);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900422
Sam Ravnborgb5678a32008-02-17 13:23:03 +0100423static int __devinit acpi_pci_root_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424{
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600425 unsigned long long segment, bus;
426 acpi_status status;
427 int result;
428 struct acpi_pci_root *root;
429 acpi_handle handle;
Rui Zhang2786f6e2006-12-21 02:21:13 -0500430 struct acpi_device *child;
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700431 u32 flags, base_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700433 root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
434 if (!root)
435 return -ENOMEM;
436
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600437 segment = 0;
438 status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
439 &segment);
440 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
441 printk(KERN_ERR PREFIX "can't evaluate _SEG\n");
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700442 result = -ENODEV;
443 goto end;
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600444 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600446 /* Check _CRS first, then _BBN. If no _BBN, default to zero. */
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700447 root->secondary.flags = IORESOURCE_BUS;
448 status = try_get_root_bridge_busnr(device->handle, &root->secondary);
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600449 if (ACPI_FAILURE(status)) {
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700450 /*
451 * We need both the start and end of the downstream bus range
452 * to interpret _CBA (MMCONFIG base address), so it really is
453 * supposed to be in _CRS. If we don't find it there, all we
454 * can do is assume [_BBN-0xFF] or [0-0xFF].
455 */
456 root->secondary.end = 0xFF;
457 printk(KERN_WARNING FW_BUG PREFIX
458 "no secondary bus range in _CRS\n");
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600459 status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, NULL, &bus);
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700460 if (ACPI_SUCCESS(status))
461 root->secondary.start = bus;
462 else if (status == AE_NOT_FOUND)
463 root->secondary.start = 0;
464 else {
465 printk(KERN_ERR PREFIX "can't evaluate _BBN\n");
466 result = -ENODEV;
467 goto end;
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600468 }
469 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600471 INIT_LIST_HEAD(&root->node);
Patrick Mochel32917e52006-05-19 16:54:39 -0400472 root->device = device;
Bjorn Helgaas07054952009-06-18 14:47:07 -0600473 root->segment = segment & 0xFFFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
475 strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700476 device->driver_data = root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477
Andrew Patterson990a7ac2008-11-10 15:30:45 -0700478 /*
479 * All supported architectures that use ACPI have support for
480 * PCI domains, so we indicate this in _OSC support capabilities.
481 */
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700482 flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900483 acpi_pci_osc_support(root, flags);
Andrew Patterson990a7ac2008-11-10 15:30:45 -0700484
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 /*
486 * TBD: Need PCI interface for enumeration/configuration of roots.
487 */
488
Len Brown4be44fc2005-08-05 00:44:28 -0400489 /* TBD: Locking */
490 list_add_tail(&root->node, &acpi_pci_roots);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700492 printk(KERN_INFO PREFIX "%s [%s] (domain %04x %pR)\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400493 acpi_device_name(device), acpi_device_bid(device),
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700494 root->segment, &root->secondary);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495
496 /*
497 * Scan the Root Bridge
498 * --------------------
499 * Must do this prior to any attempt to bind the root device, as the
500 * PCI namespace does not get created until this call is made (and
501 * thus the root bridge's pci_dev does not exist).
502 */
Bjorn Helgaas57283772010-03-11 12:20:11 -0700503 root->bus = pci_acpi_scan_root(root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 if (!root->bus) {
Len Brown64684632006-06-26 23:41:38 -0400505 printk(KERN_ERR PREFIX
506 "Bus %04x:%02x not present in PCI namespace\n",
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700507 root->segment, (unsigned int)root->secondary.start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 result = -ENODEV;
509 goto end;
510 }
511
512 /*
513 * Attach ACPI-PCI Context
514 * -----------------------
515 * Thus binding the ACPI and PCI devices.
516 */
Alexander Chiang499650d2009-06-10 19:55:30 +0000517 result = acpi_pci_bind_root(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 if (result)
519 goto end;
520
521 /*
522 * PCI Routing Table
523 * -----------------
524 * Evaluate and parse _PRT, if exists.
525 */
Patrick Mochel2d1e0a02006-05-19 16:54:43 -0400526 status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 if (ACPI_SUCCESS(status))
Alexander Chiang859a3f82009-06-10 19:55:35 +0000528 result = acpi_pci_irq_add_prt(device->handle, root->bus);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
Rui Zhang2786f6e2006-12-21 02:21:13 -0500530 /*
531 * Scan and bind all _ADR-Based Devices
532 */
533 list_for_each_entry(child, &device->children, node)
534 acpi_pci_bridge_scan(child);
535
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700536 /* Indicate support for various _OSC capabilities. */
537 if (pci_ext_cfg_avail(root->bus->self))
538 flags |= OSC_EXT_PCI_CONFIG_SUPPORT;
Andrew Patterson3e1b1602008-11-10 15:30:55 -0700539 if (pcie_aspm_enabled())
540 flags |= OSC_ACTIVE_STATE_PWR_SUPPORT |
541 OSC_CLOCK_PWR_CAPABILITY_SUPPORT;
Andrew Patterson07ae95f2008-11-10 15:31:05 -0700542 if (pci_msi_enabled())
543 flags |= OSC_MSI_SUPPORT;
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700544 if (flags != base_flags)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900545 acpi_pci_osc_support(root, flags);
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700546
Matthew Garrett852972a2010-06-22 11:25:43 -0400547 status = acpi_pci_osc_control_set(root->device->handle,
548 OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
549
550 if (ACPI_FAILURE(status)) {
551 printk(KERN_INFO "Unable to assume PCIe control: Disabling ASPM\n");
552 pcie_no_aspm();
553 }
554
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100555 pci_acpi_add_bus_pm_notifier(device, root->bus);
556 if (device->wakeup.flags.run_wake)
557 device_set_run_wake(root->bus->bridge, true);
558
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600559 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600561end:
562 if (!list_empty(&root->node))
563 list_del(&root->node);
564 kfree(root);
Patrick Mocheld550d982006-06-27 00:41:40 -0400565 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566}
567
Len Brown4be44fc2005-08-05 00:44:28 -0400568static int acpi_pci_root_start(struct acpi_device *device)
Rajesh Shahc431ada2005-04-28 00:25:45 -0700569{
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600570 struct acpi_pci_root *root = acpi_driver_data(device);
Rajesh Shahc431ada2005-04-28 00:25:45 -0700571
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600572 pci_bus_add_devices(root->bus);
573 return 0;
Rajesh Shahc431ada2005-04-28 00:25:45 -0700574}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575
Len Brown4be44fc2005-08-05 00:44:28 -0400576static int acpi_pci_root_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577{
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600578 struct acpi_pci_root *root = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100580 device_set_run_wake(root->bus->bridge, false);
581 pci_acpi_remove_bus_pm_notifier(device);
582
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 kfree(root);
Patrick Mocheld550d982006-06-27 00:41:40 -0400584 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585}
586
Len Brown4be44fc2005-08-05 00:44:28 -0400587static int __init acpi_pci_root_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 if (acpi_pci_disabled)
Patrick Mocheld550d982006-06-27 00:41:40 -0400590 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591
Bjorn Helgaas7bc5e3f2010-02-23 10:24:41 -0700592 pci_acpi_crs_quirks();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
Patrick Mocheld550d982006-06-27 00:41:40 -0400594 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595
Patrick Mocheld550d982006-06-27 00:41:40 -0400596 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597}
598
599subsys_initcall(acpi_pci_root_init);