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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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <linux/spinlock.h>
31#include <linux/pm.h>
Rafael J. Wysockib67ea762010-02-17 23:44:09 +010032#include <linux/pm_runtime.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <linux/pci.h>
Andrew Patterson990a7ac2008-11-10 15:30:45 -070034#include <linux/pci-acpi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <linux/acpi.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090036#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <acpi/acpi_bus.h>
38#include <acpi/acpi_drivers.h>
39
Len Browna192a952009-07-28 16:45:54 -040040#define PREFIX "ACPI: "
41
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#define _COMPONENT ACPI_PCI_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050043ACPI_MODULE_NAME("pci_root");
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#define ACPI_PCI_ROOT_CLASS "pci_bridge"
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge"
Len Brown4be44fc2005-08-05 00:44:28 -040046static int acpi_pci_root_add(struct acpi_device *device);
47static int acpi_pci_root_remove(struct acpi_device *device, int type);
48static int acpi_pci_root_start(struct acpi_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
Márton Némethc97adf92010-01-10 17:15:36 +010050static const struct acpi_device_id root_device_ids[] = {
Thomas Renninger1ba90e32007-07-23 14:44:41 +020051 {"PNP0A03", 0},
52 {"", 0},
53};
54MODULE_DEVICE_TABLE(acpi, root_device_ids);
55
Linus Torvalds1da177e2005-04-16 15:20:36 -070056static struct acpi_driver acpi_pci_root_driver = {
Len Brownc2b67052007-02-12 23:33:40 -050057 .name = "pci_root",
Len Brown4be44fc2005-08-05 00:44:28 -040058 .class = ACPI_PCI_ROOT_CLASS,
Thomas Renninger1ba90e32007-07-23 14:44:41 +020059 .ids = root_device_ids,
Len Brown4be44fc2005-08-05 00:44:28 -040060 .ops = {
61 .add = acpi_pci_root_add,
62 .remove = acpi_pci_root_remove,
63 .start = acpi_pci_root_start,
64 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070065};
66
Linus Torvalds1da177e2005-04-16 15:20:36 -070067static LIST_HEAD(acpi_pci_roots);
68
69static struct acpi_pci_driver *sub_driver;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +090070static DEFINE_MUTEX(osc_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
72int acpi_pci_register_driver(struct acpi_pci_driver *driver)
73{
74 int n = 0;
Bjorn Helgaasc1aec832009-06-18 14:47:02 -060075 struct acpi_pci_root *root;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
77 struct acpi_pci_driver **pptr = &sub_driver;
78 while (*pptr)
79 pptr = &(*pptr)->next;
80 *pptr = driver;
81
82 if (!driver->add)
83 return 0;
84
Bjorn Helgaasc1aec832009-06-18 14:47:02 -060085 list_for_each_entry(root, &acpi_pci_roots, node) {
Patrick Mochel2d1e0a02006-05-19 16:54:43 -040086 driver->add(root->device->handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 n++;
88 }
89
90 return n;
91}
Len Brown4be44fc2005-08-05 00:44:28 -040092
Linus Torvalds1da177e2005-04-16 15:20:36 -070093EXPORT_SYMBOL(acpi_pci_register_driver);
94
95void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
96{
Bjorn Helgaasc1aec832009-06-18 14:47:02 -060097 struct acpi_pci_root *root;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
99 struct acpi_pci_driver **pptr = &sub_driver;
100 while (*pptr) {
Akinobu Mitaf10bb252006-12-19 12:56:09 -0800101 if (*pptr == driver)
102 break;
103 pptr = &(*pptr)->next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 }
Akinobu Mitaf10bb252006-12-19 12:56:09 -0800105 BUG_ON(!*pptr);
106 *pptr = (*pptr)->next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107
108 if (!driver->remove)
109 return;
110
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600111 list_for_each_entry(root, &acpi_pci_roots, node)
Patrick Mochel2d1e0a02006-05-19 16:54:43 -0400112 driver->remove(root->device->handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113}
Len Brown4be44fc2005-08-05 00:44:28 -0400114
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115EXPORT_SYMBOL(acpi_pci_unregister_driver);
116
Justin Chend91a0072006-12-06 10:17:10 -0700117acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
118{
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600119 struct acpi_pci_root *root;
Justin Chend91a0072006-12-06 10:17:10 -0700120
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600121 list_for_each_entry(root, &acpi_pci_roots, node)
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700122 if ((root->segment == (u16) seg) &&
123 (root->secondary.start == (u16) bus))
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600124 return root->device->handle;
Justin Chend91a0072006-12-06 10:17:10 -0700125 return NULL;
126}
127
128EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
129
Alexander Chiang27558202009-06-10 19:55:14 +0000130/**
131 * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
132 * @handle - the ACPI CA node in question.
133 *
134 * Note: we could make this API take a struct acpi_device * instead, but
135 * for now, it's more convenient to operate on an acpi_handle.
136 */
137int acpi_is_root_bridge(acpi_handle handle)
138{
139 int ret;
140 struct acpi_device *device;
141
142 ret = acpi_bus_get_device(handle, &device);
143 if (ret)
144 return 0;
145
146 ret = acpi_match_device_ids(device, root_device_ids);
147 if (ret)
148 return 0;
149 else
150 return 1;
151}
152EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
153
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154static acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400155get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156{
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700157 struct resource *res = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 struct acpi_resource_address64 address;
159
Bob Moore50eca3e2005-09-30 19:03:00 -0400160 if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
161 resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
162 resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 return AE_OK;
164
165 acpi_resource_to_address64(resource, &address);
Len Brown4be44fc2005-08-05 00:44:28 -0400166 if ((address.address_length > 0) &&
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700167 (address.resource_type == ACPI_BUS_NUMBER_RANGE)) {
168 res->start = address.minimum;
169 res->end = address.minimum + address.address_length - 1;
170 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
172 return AE_OK;
173}
174
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600175static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700176 struct resource *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177{
178 acpi_status status;
179
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700180 res->start = -1;
Len Brown4be44fc2005-08-05 00:44:28 -0400181 status =
182 acpi_walk_resources(handle, METHOD_NAME__CRS,
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700183 get_root_bridge_busnr_callback, res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 if (ACPI_FAILURE(status))
185 return status;
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700186 if (res->start == -1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 return AE_ERROR;
188 return AE_OK;
189}
190
Rui Zhang2786f6e2006-12-21 02:21:13 -0500191static void acpi_pci_bridge_scan(struct acpi_device *device)
192{
193 int status;
194 struct acpi_device *child = NULL;
195
196 if (device->flags.bus_address)
197 if (device->parent && device->parent->ops.bind) {
198 status = device->parent->ops.bind(device);
199 if (!status) {
200 list_for_each_entry(child, &device->children, node)
201 acpi_pci_bridge_scan(child);
202 }
203 }
204}
205
Shaohua Li3a9622d2009-10-29 11:04:50 +0800206static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900207
208static acpi_status acpi_pci_run_osc(acpi_handle handle,
209 const u32 *capbuf, u32 *retval)
210{
Shaohua Li3a9622d2009-10-29 11:04:50 +0800211 struct acpi_osc_context context = {
212 .uuid_str = pci_osc_uuid_str,
213 .rev = 1,
214 .cap.length = 12,
215 .cap.pointer = (void *)capbuf,
216 };
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900217 acpi_status status;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900218
Shaohua Li3a9622d2009-10-29 11:04:50 +0800219 status = acpi_run_osc(handle, &context);
220 if (ACPI_SUCCESS(status)) {
221 *retval = *((u32 *)(context.ret.pointer + 8));
222 kfree(context.ret.pointer);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900223 }
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900224 return status;
225}
226
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200227static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,
228 u32 support,
229 u32 *control)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900230{
231 acpi_status status;
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200232 u32 result, capbuf[3];
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900233
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200234 support &= OSC_PCI_SUPPORT_MASKS;
235 support |= root->osc_support_set;
236
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900237 capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200238 capbuf[OSC_SUPPORT_TYPE] = support;
239 if (control) {
240 *control &= OSC_PCI_CONTROL_MASKS;
241 capbuf[OSC_CONTROL_TYPE] = *control | root->osc_control_set;
242 } else {
243 /* Run _OSC query for all possible controls. */
244 capbuf[OSC_CONTROL_TYPE] = OSC_PCI_CONTROL_MASKS;
245 }
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900246
247 status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
248 if (ACPI_SUCCESS(status)) {
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200249 root->osc_support_set = support;
Rafael J. Wysocki2b8fd912010-08-23 23:55:59 +0200250 if (control)
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200251 *control = result;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900252 }
253 return status;
254}
255
256static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
257{
258 acpi_status status;
259 acpi_handle tmp;
260
261 status = acpi_get_handle(root->device->handle, "_OSC", &tmp);
262 if (ACPI_FAILURE(status))
263 return status;
264 mutex_lock(&osc_lock);
Rafael J. Wysockiab8e8952010-08-21 01:53:27 +0200265 status = acpi_pci_query_osc(root, flags, NULL);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900266 mutex_unlock(&osc_lock);
267 return status;
268}
269
Alex Chiang76d56de2009-07-23 17:03:00 -0600270struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900271{
272 struct acpi_pci_root *root;
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600273
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900274 list_for_each_entry(root, &acpi_pci_roots, node) {
275 if (root->device->handle == handle)
276 return root;
277 }
278 return NULL;
279}
Alex Chiang76d56de2009-07-23 17:03:00 -0600280EXPORT_SYMBOL_GPL(acpi_pci_find_root);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900281
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000282struct acpi_handle_node {
283 struct list_head node;
284 acpi_handle handle;
285};
286
287/**
288 * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev
289 * @handle: the handle in question
290 *
291 * Given an ACPI CA handle, the desired PCI device is located in the
292 * list of PCI devices.
293 *
294 * If the device is found, its reference count is increased and this
295 * function returns a pointer to its data structure. The caller must
296 * decrement the reference count by calling pci_dev_put().
297 * If no device is found, %NULL is returned.
298 */
299struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
300{
301 int dev, fn;
302 unsigned long long adr;
303 acpi_status status;
304 acpi_handle phandle;
305 struct pci_bus *pbus;
306 struct pci_dev *pdev = NULL;
307 struct acpi_handle_node *node, *tmp;
308 struct acpi_pci_root *root;
309 LIST_HEAD(device_list);
310
311 /*
312 * Walk up the ACPI CA namespace until we reach a PCI root bridge.
313 */
314 phandle = handle;
315 while (!acpi_is_root_bridge(phandle)) {
316 node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL);
317 if (!node)
318 goto out;
319
320 INIT_LIST_HEAD(&node->node);
321 node->handle = phandle;
322 list_add(&node->node, &device_list);
323
324 status = acpi_get_parent(phandle, &phandle);
325 if (ACPI_FAILURE(status))
326 goto out;
327 }
328
329 root = acpi_pci_find_root(phandle);
330 if (!root)
331 goto out;
332
333 pbus = root->bus;
334
335 /*
336 * Now, walk back down the PCI device tree until we return to our
337 * original handle. Assumes that everything between the PCI root
338 * bridge and the device we're looking for must be a P2P bridge.
339 */
340 list_for_each_entry(node, &device_list, node) {
341 acpi_handle hnd = node->handle;
342 status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr);
343 if (ACPI_FAILURE(status))
344 goto out;
345 dev = (adr >> 16) & 0xffff;
346 fn = adr & 0xffff;
347
348 pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn));
Troy Moure412af972009-06-25 17:05:35 -0600349 if (!pdev || hnd == handle)
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000350 break;
351
352 pbus = pdev->subordinate;
353 pci_dev_put(pdev);
Rafael J. Wysocki497fb542009-10-13 01:01:57 +0200354
355 /*
356 * This function may be called for a non-PCI device that has a
357 * PCI parent (eg. a disk under a PCI SATA controller). In that
358 * case pdev->subordinate will be NULL for the parent.
359 */
360 if (!pbus) {
361 dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n");
362 pdev = NULL;
363 break;
364 }
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000365 }
366out:
367 list_for_each_entry_safe(node, tmp, &device_list, node)
368 kfree(node);
369
370 return pdev;
371}
372EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
373
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900374/**
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200375 * acpi_pci_osc_control_set - Request control of PCI root _OSC features.
376 * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex).
377 * @mask: Mask of _OSC bits to request control of, place to store control mask.
378 * @req: Mask of _OSC bits the control of is essential to the caller.
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900379 *
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200380 * Run _OSC query for @mask and if that is successful, compare the returned
381 * mask of control bits with @req. If all of the @req bits are set in the
382 * returned mask, run _OSC request for it.
383 *
384 * The variable at the @mask address may be modified regardless of whether or
385 * not the function returns success. On success it will contain the mask of
386 * _OSC bits the BIOS has granted control of, but its contents are meaningless
387 * on failure.
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900388 **/
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200389acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900390{
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900391 struct acpi_pci_root *root;
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200392 acpi_status status;
393 u32 ctrl, capbuf[3];
394 acpi_handle tmp;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900395
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200396 if (!mask)
397 return AE_BAD_PARAMETER;
398
399 ctrl = *mask & OSC_PCI_CONTROL_MASKS;
400 if ((ctrl & req) != req)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900401 return AE_TYPE;
402
403 root = acpi_pci_find_root(handle);
404 if (!root)
405 return AE_NOT_EXIST;
406
Rafael J. Wysockib879dc42010-08-21 01:52:37 +0200407 status = acpi_get_handle(handle, "_OSC", &tmp);
408 if (ACPI_FAILURE(status))
409 return status;
410
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900411 mutex_lock(&osc_lock);
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200412
413 *mask = ctrl | root->osc_control_set;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900414 /* No need to evaluate _OSC if the control was already granted. */
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200415 if ((root->osc_control_set & ctrl) == ctrl)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900416 goto out;
417
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200418 /* Need to check the available controls bits before requesting them. */
419 while (*mask) {
420 status = acpi_pci_query_osc(root, root->osc_support_set, mask);
421 if (ACPI_FAILURE(status))
422 goto out;
423 if (ctrl == *mask)
424 break;
425 ctrl = *mask;
426 }
Rafael J. Wysocki2b8fd912010-08-23 23:55:59 +0200427
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200428 if ((ctrl & req) != req) {
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900429 status = AE_SUPPORT;
430 goto out;
431 }
432
433 capbuf[OSC_QUERY_TYPE] = 0;
434 capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set;
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200435 capbuf[OSC_CONTROL_TYPE] = ctrl;
436 status = acpi_pci_run_osc(handle, capbuf, mask);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900437 if (ACPI_SUCCESS(status))
Rafael J. Wysocki75fb60f2010-08-23 23:53:11 +0200438 root->osc_control_set = *mask;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900439out:
440 mutex_unlock(&osc_lock);
441 return status;
442}
Kenji Kaneshige9f5404d2009-02-09 16:00:04 +0900443EXPORT_SYMBOL(acpi_pci_osc_control_set);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900444
Sam Ravnborgb5678a32008-02-17 13:23:03 +0100445static int __devinit acpi_pci_root_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446{
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600447 unsigned long long segment, bus;
448 acpi_status status;
449 int result;
450 struct acpi_pci_root *root;
451 acpi_handle handle;
Rui Zhang2786f6e2006-12-21 02:21:13 -0500452 struct acpi_device *child;
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700453 u32 flags, base_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700455 root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
456 if (!root)
457 return -ENOMEM;
458
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600459 segment = 0;
460 status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
461 &segment);
462 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
463 printk(KERN_ERR PREFIX "can't evaluate _SEG\n");
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700464 result = -ENODEV;
465 goto end;
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600466 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600468 /* Check _CRS first, then _BBN. If no _BBN, default to zero. */
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700469 root->secondary.flags = IORESOURCE_BUS;
470 status = try_get_root_bridge_busnr(device->handle, &root->secondary);
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600471 if (ACPI_FAILURE(status)) {
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700472 /*
473 * We need both the start and end of the downstream bus range
474 * to interpret _CBA (MMCONFIG base address), so it really is
475 * supposed to be in _CRS. If we don't find it there, all we
476 * can do is assume [_BBN-0xFF] or [0-0xFF].
477 */
478 root->secondary.end = 0xFF;
479 printk(KERN_WARNING FW_BUG PREFIX
480 "no secondary bus range in _CRS\n");
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600481 status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, NULL, &bus);
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700482 if (ACPI_SUCCESS(status))
483 root->secondary.start = bus;
484 else if (status == AE_NOT_FOUND)
485 root->secondary.start = 0;
486 else {
487 printk(KERN_ERR PREFIX "can't evaluate _BBN\n");
488 result = -ENODEV;
489 goto end;
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600490 }
491 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600493 INIT_LIST_HEAD(&root->node);
Patrick Mochel32917e52006-05-19 16:54:39 -0400494 root->device = device;
Bjorn Helgaas07054952009-06-18 14:47:07 -0600495 root->segment = segment & 0xFFFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
497 strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700498 device->driver_data = root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
Andrew Patterson990a7ac2008-11-10 15:30:45 -0700500 /*
501 * All supported architectures that use ACPI have support for
502 * PCI domains, so we indicate this in _OSC support capabilities.
503 */
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700504 flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900505 acpi_pci_osc_support(root, flags);
Andrew Patterson990a7ac2008-11-10 15:30:45 -0700506
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 /*
508 * TBD: Need PCI interface for enumeration/configuration of roots.
509 */
510
Len Brown4be44fc2005-08-05 00:44:28 -0400511 /* TBD: Locking */
512 list_add_tail(&root->node, &acpi_pci_roots);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700514 printk(KERN_INFO PREFIX "%s [%s] (domain %04x %pR)\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400515 acpi_device_name(device), acpi_device_bid(device),
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700516 root->segment, &root->secondary);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517
518 /*
519 * Scan the Root Bridge
520 * --------------------
521 * Must do this prior to any attempt to bind the root device, as the
522 * PCI namespace does not get created until this call is made (and
523 * thus the root bridge's pci_dev does not exist).
524 */
Bjorn Helgaas57283772010-03-11 12:20:11 -0700525 root->bus = pci_acpi_scan_root(root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 if (!root->bus) {
Len Brown64684632006-06-26 23:41:38 -0400527 printk(KERN_ERR PREFIX
528 "Bus %04x:%02x not present in PCI namespace\n",
Bjorn Helgaas6ad95512010-03-11 12:20:06 -0700529 root->segment, (unsigned int)root->secondary.start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 result = -ENODEV;
531 goto end;
532 }
533
534 /*
535 * Attach ACPI-PCI Context
536 * -----------------------
537 * Thus binding the ACPI and PCI devices.
538 */
Alexander Chiang499650d2009-06-10 19:55:30 +0000539 result = acpi_pci_bind_root(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 if (result)
541 goto end;
542
543 /*
544 * PCI Routing Table
545 * -----------------
546 * Evaluate and parse _PRT, if exists.
547 */
Patrick Mochel2d1e0a02006-05-19 16:54:43 -0400548 status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 if (ACPI_SUCCESS(status))
Alexander Chiang859a3f82009-06-10 19:55:35 +0000550 result = acpi_pci_irq_add_prt(device->handle, root->bus);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551
Rui Zhang2786f6e2006-12-21 02:21:13 -0500552 /*
553 * Scan and bind all _ADR-Based Devices
554 */
555 list_for_each_entry(child, &device->children, node)
556 acpi_pci_bridge_scan(child);
557
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700558 /* Indicate support for various _OSC capabilities. */
559 if (pci_ext_cfg_avail(root->bus->self))
560 flags |= OSC_EXT_PCI_CONFIG_SUPPORT;
Andrew Patterson3e1b1602008-11-10 15:30:55 -0700561 if (pcie_aspm_enabled())
562 flags |= OSC_ACTIVE_STATE_PWR_SUPPORT |
563 OSC_CLOCK_PWR_CAPABILITY_SUPPORT;
Andrew Patterson07ae95f2008-11-10 15:31:05 -0700564 if (pci_msi_enabled())
565 flags |= OSC_MSI_SUPPORT;
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700566 if (flags != base_flags)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900567 acpi_pci_osc_support(root, flags);
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700568
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100569 pci_acpi_add_bus_pm_notifier(device, root->bus);
570 if (device->wakeup.flags.run_wake)
571 device_set_run_wake(root->bus->bridge, true);
572
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600573 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600575end:
576 if (!list_empty(&root->node))
577 list_del(&root->node);
578 kfree(root);
Patrick Mocheld550d982006-06-27 00:41:40 -0400579 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580}
581
Len Brown4be44fc2005-08-05 00:44:28 -0400582static int acpi_pci_root_start(struct acpi_device *device)
Rajesh Shahc431ada2005-04-28 00:25:45 -0700583{
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600584 struct acpi_pci_root *root = acpi_driver_data(device);
Rajesh Shahc431ada2005-04-28 00:25:45 -0700585
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600586 pci_bus_add_devices(root->bus);
587 return 0;
Rajesh Shahc431ada2005-04-28 00:25:45 -0700588}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589
Len Brown4be44fc2005-08-05 00:44:28 -0400590static int acpi_pci_root_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591{
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600592 struct acpi_pci_root *root = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100594 device_set_run_wake(root->bus->bridge, false);
595 pci_acpi_remove_bus_pm_notifier(device);
596
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 kfree(root);
Patrick Mocheld550d982006-06-27 00:41:40 -0400598 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599}
600
Len Brown4be44fc2005-08-05 00:44:28 -0400601static int __init acpi_pci_root_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 if (acpi_pci_disabled)
Patrick Mocheld550d982006-06-27 00:41:40 -0400604 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605
Bjorn Helgaas7bc5e3f2010-02-23 10:24:41 -0700606 pci_acpi_crs_quirks();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
Patrick Mocheld550d982006-06-27 00:41:40 -0400608 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609
Patrick Mocheld550d982006-06-27 00:41:40 -0400610 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611}
612
613subsys_initcall(acpi_pci_root_init);