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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>
30#include <linux/proc_fs.h>
31#include <linux/spinlock.h>
32#include <linux/pm.h>
33#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>
36#include <acpi/acpi_bus.h>
37#include <acpi/acpi_drivers.h>
38
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#define _COMPONENT ACPI_PCI_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050040ACPI_MODULE_NAME("pci_root");
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#define ACPI_PCI_ROOT_CLASS "pci_bridge"
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge"
Len Brown4be44fc2005-08-05 00:44:28 -040043static int acpi_pci_root_add(struct acpi_device *device);
44static int acpi_pci_root_remove(struct acpi_device *device, int type);
45static int acpi_pci_root_start(struct acpi_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
Thomas Renninger1ba90e32007-07-23 14:44:41 +020047static struct acpi_device_id root_device_ids[] = {
48 {"PNP0A03", 0},
49 {"", 0},
50};
51MODULE_DEVICE_TABLE(acpi, root_device_ids);
52
Linus Torvalds1da177e2005-04-16 15:20:36 -070053static struct acpi_driver acpi_pci_root_driver = {
Len Brownc2b67052007-02-12 23:33:40 -050054 .name = "pci_root",
Len Brown4be44fc2005-08-05 00:44:28 -040055 .class = ACPI_PCI_ROOT_CLASS,
Thomas Renninger1ba90e32007-07-23 14:44:41 +020056 .ids = root_device_ids,
Len Brown4be44fc2005-08-05 00:44:28 -040057 .ops = {
58 .add = acpi_pci_root_add,
59 .remove = acpi_pci_root_remove,
60 .start = acpi_pci_root_start,
61 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070062};
63
64struct acpi_pci_root {
Len Brown4be44fc2005-08-05 00:44:28 -040065 struct list_head node;
Bjorn Helgaas07054952009-06-18 14:47:07 -060066 struct acpi_device *device;
Len Brown4be44fc2005-08-05 00:44:28 -040067 struct pci_bus *bus;
Bjorn Helgaas07054952009-06-18 14:47:07 -060068 u16 segment;
69 u8 bus_nr;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +090070
71 u32 osc_support_set; /* _OSC state of support bits */
72 u32 osc_control_set; /* _OSC state of control bits */
73 u32 osc_control_qry; /* the latest _OSC query result */
74
75 u32 osc_queried:1; /* has _OSC control been queried? */
Linus Torvalds1da177e2005-04-16 15:20:36 -070076};
77
78static LIST_HEAD(acpi_pci_roots);
79
80static struct acpi_pci_driver *sub_driver;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +090081static DEFINE_MUTEX(osc_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
83int acpi_pci_register_driver(struct acpi_pci_driver *driver)
84{
85 int n = 0;
Bjorn Helgaasc1aec832009-06-18 14:47:02 -060086 struct acpi_pci_root *root;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88 struct acpi_pci_driver **pptr = &sub_driver;
89 while (*pptr)
90 pptr = &(*pptr)->next;
91 *pptr = driver;
92
93 if (!driver->add)
94 return 0;
95
Bjorn Helgaasc1aec832009-06-18 14:47:02 -060096 list_for_each_entry(root, &acpi_pci_roots, node) {
Patrick Mochel2d1e0a02006-05-19 16:54:43 -040097 driver->add(root->device->handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 n++;
99 }
100
101 return n;
102}
Len Brown4be44fc2005-08-05 00:44:28 -0400103
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104EXPORT_SYMBOL(acpi_pci_register_driver);
105
106void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
107{
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600108 struct acpi_pci_root *root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
110 struct acpi_pci_driver **pptr = &sub_driver;
111 while (*pptr) {
Akinobu Mitaf10bb252006-12-19 12:56:09 -0800112 if (*pptr == driver)
113 break;
114 pptr = &(*pptr)->next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 }
Akinobu Mitaf10bb252006-12-19 12:56:09 -0800116 BUG_ON(!*pptr);
117 *pptr = (*pptr)->next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
119 if (!driver->remove)
120 return;
121
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600122 list_for_each_entry(root, &acpi_pci_roots, node)
Patrick Mochel2d1e0a02006-05-19 16:54:43 -0400123 driver->remove(root->device->handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124}
Len Brown4be44fc2005-08-05 00:44:28 -0400125
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126EXPORT_SYMBOL(acpi_pci_unregister_driver);
127
Justin Chend91a0072006-12-06 10:17:10 -0700128acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
129{
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600130 struct acpi_pci_root *root;
Justin Chend91a0072006-12-06 10:17:10 -0700131
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600132 list_for_each_entry(root, &acpi_pci_roots, node)
Bjorn Helgaas07054952009-06-18 14:47:07 -0600133 if ((root->segment == (u16) seg) && (root->bus_nr == (u16) bus))
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600134 return root->device->handle;
Justin Chend91a0072006-12-06 10:17:10 -0700135 return NULL;
136}
137
138EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
139
Alexander Chiang27558202009-06-10 19:55:14 +0000140/**
141 * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
142 * @handle - the ACPI CA node in question.
143 *
144 * Note: we could make this API take a struct acpi_device * instead, but
145 * for now, it's more convenient to operate on an acpi_handle.
146 */
147int acpi_is_root_bridge(acpi_handle handle)
148{
149 int ret;
150 struct acpi_device *device;
151
152 ret = acpi_bus_get_device(handle, &device);
153 if (ret)
154 return 0;
155
156 ret = acpi_match_device_ids(device, root_device_ids);
157 if (ret)
158 return 0;
159 else
160 return 1;
161}
162EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164static acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400165get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166{
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200167 int *busnr = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 struct acpi_resource_address64 address;
169
Bob Moore50eca3e2005-09-30 19:03:00 -0400170 if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
171 resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
172 resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 return AE_OK;
174
175 acpi_resource_to_address64(resource, &address);
Len Brown4be44fc2005-08-05 00:44:28 -0400176 if ((address.address_length > 0) &&
177 (address.resource_type == ACPI_BUS_NUMBER_RANGE))
Bob Moore50eca3e2005-09-30 19:03:00 -0400178 *busnr = address.minimum;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
180 return AE_OK;
181}
182
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600183static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
184 unsigned long long *bus)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185{
186 acpi_status status;
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600187 int busnum;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600189 busnum = -1;
Len Brown4be44fc2005-08-05 00:44:28 -0400190 status =
191 acpi_walk_resources(handle, METHOD_NAME__CRS,
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600192 get_root_bridge_busnr_callback, &busnum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 if (ACPI_FAILURE(status))
194 return status;
195 /* Check if we really get a bus number from _CRS */
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600196 if (busnum == -1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 return AE_ERROR;
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600198 *bus = busnum;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 return AE_OK;
200}
201
Rui Zhang2786f6e2006-12-21 02:21:13 -0500202static void acpi_pci_bridge_scan(struct acpi_device *device)
203{
204 int status;
205 struct acpi_device *child = NULL;
206
207 if (device->flags.bus_address)
208 if (device->parent && device->parent->ops.bind) {
209 status = device->parent->ops.bind(device);
210 if (!status) {
211 list_for_each_entry(child, &device->children, node)
212 acpi_pci_bridge_scan(child);
213 }
214 }
215}
216
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900217static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40,
218 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
219
220static acpi_status acpi_pci_run_osc(acpi_handle handle,
221 const u32 *capbuf, u32 *retval)
222{
223 acpi_status status;
224 struct acpi_object_list input;
225 union acpi_object in_params[4];
226 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
227 union acpi_object *out_obj;
228 u32 errors;
229
230 /* Setting up input parameters */
231 input.count = 4;
232 input.pointer = in_params;
233 in_params[0].type = ACPI_TYPE_BUFFER;
234 in_params[0].buffer.length = 16;
235 in_params[0].buffer.pointer = OSC_UUID;
236 in_params[1].type = ACPI_TYPE_INTEGER;
237 in_params[1].integer.value = 1;
238 in_params[2].type = ACPI_TYPE_INTEGER;
239 in_params[2].integer.value = 3;
240 in_params[3].type = ACPI_TYPE_BUFFER;
241 in_params[3].buffer.length = 12;
242 in_params[3].buffer.pointer = (u8 *)capbuf;
243
244 status = acpi_evaluate_object(handle, "_OSC", &input, &output);
245 if (ACPI_FAILURE(status))
246 return status;
247
248 if (!output.length)
249 return AE_NULL_OBJECT;
250
251 out_obj = output.pointer;
252 if (out_obj->type != ACPI_TYPE_BUFFER) {
253 printk(KERN_DEBUG "_OSC evaluation returned wrong type\n");
254 status = AE_TYPE;
255 goto out_kfree;
256 }
257 /* Need to ignore the bit0 in result code */
258 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
259 if (errors) {
260 if (errors & OSC_REQUEST_ERROR)
261 printk(KERN_DEBUG "_OSC request failed\n");
262 if (errors & OSC_INVALID_UUID_ERROR)
263 printk(KERN_DEBUG "_OSC invalid UUID\n");
264 if (errors & OSC_INVALID_REVISION_ERROR)
265 printk(KERN_DEBUG "_OSC invalid revision\n");
266 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
267 if (capbuf[OSC_QUERY_TYPE] & OSC_QUERY_ENABLE)
268 goto out_success;
269 printk(KERN_DEBUG
270 "Firmware did not grant requested _OSC control\n");
271 status = AE_SUPPORT;
272 goto out_kfree;
273 }
274 status = AE_ERROR;
275 goto out_kfree;
276 }
277out_success:
278 *retval = *((u32 *)(out_obj->buffer.pointer + 8));
279 status = AE_OK;
280
281out_kfree:
282 kfree(output.pointer);
283 return status;
284}
285
286static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, u32 flags)
287{
288 acpi_status status;
289 u32 support_set, result, capbuf[3];
290
291 /* do _OSC query for all possible controls */
292 support_set = root->osc_support_set | (flags & OSC_SUPPORT_MASKS);
293 capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
294 capbuf[OSC_SUPPORT_TYPE] = support_set;
295 capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
296
297 status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
298 if (ACPI_SUCCESS(status)) {
299 root->osc_support_set = support_set;
300 root->osc_control_qry = result;
301 root->osc_queried = 1;
302 }
303 return status;
304}
305
306static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
307{
308 acpi_status status;
309 acpi_handle tmp;
310
311 status = acpi_get_handle(root->device->handle, "_OSC", &tmp);
312 if (ACPI_FAILURE(status))
313 return status;
314 mutex_lock(&osc_lock);
315 status = acpi_pci_query_osc(root, flags);
316 mutex_unlock(&osc_lock);
317 return status;
318}
319
320static struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
321{
322 struct acpi_pci_root *root;
Bjorn Helgaasc1aec832009-06-18 14:47:02 -0600323
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900324 list_for_each_entry(root, &acpi_pci_roots, node) {
325 if (root->device->handle == handle)
326 return root;
327 }
328 return NULL;
329}
330
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000331struct acpi_handle_node {
332 struct list_head node;
333 acpi_handle handle;
334};
335
336/**
337 * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev
338 * @handle: the handle in question
339 *
340 * Given an ACPI CA handle, the desired PCI device is located in the
341 * list of PCI devices.
342 *
343 * If the device is found, its reference count is increased and this
344 * function returns a pointer to its data structure. The caller must
345 * decrement the reference count by calling pci_dev_put().
346 * If no device is found, %NULL is returned.
347 */
348struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
349{
350 int dev, fn;
351 unsigned long long adr;
352 acpi_status status;
353 acpi_handle phandle;
354 struct pci_bus *pbus;
355 struct pci_dev *pdev = NULL;
356 struct acpi_handle_node *node, *tmp;
357 struct acpi_pci_root *root;
358 LIST_HEAD(device_list);
359
360 /*
361 * Walk up the ACPI CA namespace until we reach a PCI root bridge.
362 */
363 phandle = handle;
364 while (!acpi_is_root_bridge(phandle)) {
365 node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL);
366 if (!node)
367 goto out;
368
369 INIT_LIST_HEAD(&node->node);
370 node->handle = phandle;
371 list_add(&node->node, &device_list);
372
373 status = acpi_get_parent(phandle, &phandle);
374 if (ACPI_FAILURE(status))
375 goto out;
376 }
377
378 root = acpi_pci_find_root(phandle);
379 if (!root)
380 goto out;
381
382 pbus = root->bus;
383
384 /*
385 * Now, walk back down the PCI device tree until we return to our
386 * original handle. Assumes that everything between the PCI root
387 * bridge and the device we're looking for must be a P2P bridge.
388 */
389 list_for_each_entry(node, &device_list, node) {
390 acpi_handle hnd = node->handle;
391 status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr);
392 if (ACPI_FAILURE(status))
393 goto out;
394 dev = (adr >> 16) & 0xffff;
395 fn = adr & 0xffff;
396
397 pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn));
Troy Moure412af972009-06-25 17:05:35 -0600398 if (!pdev || hnd == handle)
Alexander Chiang2f7bbce2009-06-10 19:55:20 +0000399 break;
400
401 pbus = pdev->subordinate;
402 pci_dev_put(pdev);
403 }
404out:
405 list_for_each_entry_safe(node, tmp, &device_list, node)
406 kfree(node);
407
408 return pdev;
409}
410EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
411
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900412/**
Kenji Kaneshige9f5404d2009-02-09 16:00:04 +0900413 * acpi_pci_osc_control_set - commit requested control to Firmware
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900414 * @handle: acpi_handle for the target ACPI object
415 * @flags: driver's requested control bits
416 *
417 * Attempt to take control from Firmware on requested control bits.
418 **/
Kenji Kaneshige9f5404d2009-02-09 16:00:04 +0900419acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 flags)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900420{
421 acpi_status status;
422 u32 control_req, result, capbuf[3];
423 acpi_handle tmp;
424 struct acpi_pci_root *root;
425
426 status = acpi_get_handle(handle, "_OSC", &tmp);
427 if (ACPI_FAILURE(status))
428 return status;
429
430 control_req = (flags & OSC_CONTROL_MASKS);
431 if (!control_req)
432 return AE_TYPE;
433
434 root = acpi_pci_find_root(handle);
435 if (!root)
436 return AE_NOT_EXIST;
437
438 mutex_lock(&osc_lock);
439 /* No need to evaluate _OSC if the control was already granted. */
440 if ((root->osc_control_set & control_req) == control_req)
441 goto out;
442
443 /* Need to query controls first before requesting them */
444 if (!root->osc_queried) {
445 status = acpi_pci_query_osc(root, root->osc_support_set);
446 if (ACPI_FAILURE(status))
447 goto out;
448 }
449 if ((root->osc_control_qry & control_req) != control_req) {
450 printk(KERN_DEBUG
451 "Firmware did not grant requested _OSC control\n");
452 status = AE_SUPPORT;
453 goto out;
454 }
455
456 capbuf[OSC_QUERY_TYPE] = 0;
457 capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set;
458 capbuf[OSC_CONTROL_TYPE] = root->osc_control_set | control_req;
459 status = acpi_pci_run_osc(handle, capbuf, &result);
460 if (ACPI_SUCCESS(status))
461 root->osc_control_set = result;
462out:
463 mutex_unlock(&osc_lock);
464 return status;
465}
Kenji Kaneshige9f5404d2009-02-09 16:00:04 +0900466EXPORT_SYMBOL(acpi_pci_osc_control_set);
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900467
Sam Ravnborgb5678a32008-02-17 13:23:03 +0100468static int __devinit acpi_pci_root_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469{
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600470 unsigned long long segment, bus;
471 acpi_status status;
472 int result;
473 struct acpi_pci_root *root;
474 acpi_handle handle;
Rui Zhang2786f6e2006-12-21 02:21:13 -0500475 struct acpi_device *child;
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700476 u32 flags, base_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600478 segment = 0;
479 status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
480 &segment);
481 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
482 printk(KERN_ERR PREFIX "can't evaluate _SEG\n");
483 return -ENODEV;
484 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600486 /* Check _CRS first, then _BBN. If no _BBN, default to zero. */
487 bus = 0;
488 status = try_get_root_bridge_busnr(device->handle, &bus);
489 if (ACPI_FAILURE(status)) {
490 status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, NULL, &bus);
491 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
492 printk(KERN_ERR PREFIX
493 "no bus number in _CRS and can't evaluate _BBN\n");
494 return -ENODEV;
495 }
496 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497
Burman Yan36bcbec2006-12-19 12:56:11 -0800498 root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 if (!root)
Patrick Mocheld550d982006-06-27 00:41:40 -0400500 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600502 INIT_LIST_HEAD(&root->node);
Patrick Mochel32917e52006-05-19 16:54:39 -0400503 root->device = device;
Bjorn Helgaas07054952009-06-18 14:47:07 -0600504 root->segment = segment & 0xFFFF;
505 root->bus_nr = bus & 0xFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
507 strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700508 device->driver_data = root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509
Andrew Patterson990a7ac2008-11-10 15:30:45 -0700510 /*
511 * All supported architectures that use ACPI have support for
512 * PCI domains, so we indicate this in _OSC support capabilities.
513 */
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700514 flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900515 acpi_pci_osc_support(root, flags);
Andrew Patterson990a7ac2008-11-10 15:30:45 -0700516
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 /*
518 * TBD: Need PCI interface for enumeration/configuration of roots.
519 */
520
Len Brown4be44fc2005-08-05 00:44:28 -0400521 /* TBD: Locking */
522 list_add_tail(&root->node, &acpi_pci_roots);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523
Len Brown4be44fc2005-08-05 00:44:28 -0400524 printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n",
525 acpi_device_name(device), acpi_device_bid(device),
Bjorn Helgaas07054952009-06-18 14:47:07 -0600526 root->segment, root->bus_nr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527
528 /*
529 * Scan the Root Bridge
530 * --------------------
531 * Must do this prior to any attempt to bind the root device, as the
532 * PCI namespace does not get created until this call is made (and
533 * thus the root bridge's pci_dev does not exist).
534 */
Bjorn Helgaas07054952009-06-18 14:47:07 -0600535 root->bus = pci_acpi_scan_root(device, segment, bus);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 if (!root->bus) {
Len Brown64684632006-06-26 23:41:38 -0400537 printk(KERN_ERR PREFIX
538 "Bus %04x:%02x not present in PCI namespace\n",
Bjorn Helgaas07054952009-06-18 14:47:07 -0600539 root->segment, root->bus_nr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 result = -ENODEV;
541 goto end;
542 }
543
544 /*
545 * Attach ACPI-PCI Context
546 * -----------------------
547 * Thus binding the ACPI and PCI devices.
548 */
Alexander Chiang499650d2009-06-10 19:55:30 +0000549 result = acpi_pci_bind_root(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 if (result)
551 goto end;
552
553 /*
554 * PCI Routing Table
555 * -----------------
556 * Evaluate and parse _PRT, if exists.
557 */
Patrick Mochel2d1e0a02006-05-19 16:54:43 -0400558 status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 if (ACPI_SUCCESS(status))
Alexander Chiang859a3f82009-06-10 19:55:35 +0000560 result = acpi_pci_irq_add_prt(device->handle, root->bus);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561
Rui Zhang2786f6e2006-12-21 02:21:13 -0500562 /*
563 * Scan and bind all _ADR-Based Devices
564 */
565 list_for_each_entry(child, &device->children, node)
566 acpi_pci_bridge_scan(child);
567
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700568 /* Indicate support for various _OSC capabilities. */
569 if (pci_ext_cfg_avail(root->bus->self))
570 flags |= OSC_EXT_PCI_CONFIG_SUPPORT;
Andrew Patterson3e1b1602008-11-10 15:30:55 -0700571 if (pcie_aspm_enabled())
572 flags |= OSC_ACTIVE_STATE_PWR_SUPPORT |
573 OSC_CLOCK_PWR_CAPABILITY_SUPPORT;
Andrew Patterson07ae95f2008-11-10 15:31:05 -0700574 if (pci_msi_enabled())
575 flags |= OSC_MSI_SUPPORT;
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700576 if (flags != base_flags)
Kenji Kaneshige63f10f02009-02-09 15:59:29 +0900577 acpi_pci_osc_support(root, flags);
Andrew Patterson0ef5f8f2008-11-10 15:30:50 -0700578
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600579 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580
Bjorn Helgaasf5eebbe2009-06-18 14:46:52 -0600581end:
582 if (!list_empty(&root->node))
583 list_del(&root->node);
584 kfree(root);
Patrick Mocheld550d982006-06-27 00:41:40 -0400585 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586}
587
Len Brown4be44fc2005-08-05 00:44:28 -0400588static int acpi_pci_root_start(struct acpi_device *device)
Rajesh Shahc431ada2005-04-28 00:25:45 -0700589{
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600590 struct acpi_pci_root *root = acpi_driver_data(device);
Rajesh Shahc431ada2005-04-28 00:25:45 -0700591
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600592 pci_bus_add_devices(root->bus);
593 return 0;
Rajesh Shahc431ada2005-04-28 00:25:45 -0700594}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595
Len Brown4be44fc2005-08-05 00:44:28 -0400596static int acpi_pci_root_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597{
Bjorn Helgaascaf420c2009-06-18 14:46:57 -0600598 struct acpi_pci_root *root = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599
600 kfree(root);
Patrick Mocheld550d982006-06-27 00:41:40 -0400601 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602}
603
Len Brown4be44fc2005-08-05 00:44:28 -0400604static int __init acpi_pci_root_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 if (acpi_pci_disabled)
Patrick Mocheld550d982006-06-27 00:41:40 -0400607 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
Patrick Mocheld550d982006-06-27 00:41:40 -0400610 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611
Patrick Mocheld550d982006-06-27 00:41:40 -0400612 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613}
614
615subsys_initcall(acpi_pci_root_init);