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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 | ||
a192a958 LB |
39 | #define PREFIX "ACPI: " |
40 | ||
1da177e4 | 41 | #define _COMPONENT ACPI_PCI_COMPONENT |
f52fd66d | 42 | ACPI_MODULE_NAME("pci_root"); |
1da177e4 | 43 | #define ACPI_PCI_ROOT_CLASS "pci_bridge" |
1da177e4 | 44 | #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge" |
4be44fcd LB |
45 | static int acpi_pci_root_add(struct acpi_device *device); |
46 | static int acpi_pci_root_remove(struct acpi_device *device, int type); | |
47 | static int acpi_pci_root_start(struct acpi_device *device); | |
1da177e4 | 48 | |
1ba90e3a TR |
49 | static struct acpi_device_id root_device_ids[] = { |
50 | {"PNP0A03", 0}, | |
51 | {"", 0}, | |
52 | }; | |
53 | MODULE_DEVICE_TABLE(acpi, root_device_ids); | |
54 | ||
1da177e4 | 55 | static struct acpi_driver acpi_pci_root_driver = { |
c2b6705b | 56 | .name = "pci_root", |
4be44fcd | 57 | .class = ACPI_PCI_ROOT_CLASS, |
1ba90e3a | 58 | .ids = root_device_ids, |
4be44fcd LB |
59 | .ops = { |
60 | .add = acpi_pci_root_add, | |
61 | .remove = acpi_pci_root_remove, | |
62 | .start = acpi_pci_root_start, | |
63 | }, | |
1da177e4 LT |
64 | }; |
65 | ||
1da177e4 LT |
66 | static LIST_HEAD(acpi_pci_roots); |
67 | ||
68 | static struct acpi_pci_driver *sub_driver; | |
63f10f0f | 69 | static DEFINE_MUTEX(osc_lock); |
1da177e4 LT |
70 | |
71 | int acpi_pci_register_driver(struct acpi_pci_driver *driver) | |
72 | { | |
73 | int n = 0; | |
c1aec834 | 74 | struct acpi_pci_root *root; |
1da177e4 LT |
75 | |
76 | struct acpi_pci_driver **pptr = &sub_driver; | |
77 | while (*pptr) | |
78 | pptr = &(*pptr)->next; | |
79 | *pptr = driver; | |
80 | ||
81 | if (!driver->add) | |
82 | return 0; | |
83 | ||
c1aec834 | 84 | list_for_each_entry(root, &acpi_pci_roots, node) { |
2d1e0a02 | 85 | driver->add(root->device->handle); |
1da177e4 LT |
86 | n++; |
87 | } | |
88 | ||
89 | return n; | |
90 | } | |
4be44fcd | 91 | |
1da177e4 LT |
92 | EXPORT_SYMBOL(acpi_pci_register_driver); |
93 | ||
94 | void acpi_pci_unregister_driver(struct acpi_pci_driver *driver) | |
95 | { | |
c1aec834 | 96 | struct acpi_pci_root *root; |
1da177e4 LT |
97 | |
98 | struct acpi_pci_driver **pptr = &sub_driver; | |
99 | while (*pptr) { | |
f10bb254 AM |
100 | if (*pptr == driver) |
101 | break; | |
102 | pptr = &(*pptr)->next; | |
1da177e4 | 103 | } |
f10bb254 AM |
104 | BUG_ON(!*pptr); |
105 | *pptr = (*pptr)->next; | |
1da177e4 LT |
106 | |
107 | if (!driver->remove) | |
108 | return; | |
109 | ||
c1aec834 | 110 | list_for_each_entry(root, &acpi_pci_roots, node) |
2d1e0a02 | 111 | driver->remove(root->device->handle); |
1da177e4 | 112 | } |
4be44fcd | 113 | |
1da177e4 LT |
114 | EXPORT_SYMBOL(acpi_pci_unregister_driver); |
115 | ||
d91a0078 JC |
116 | acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus) |
117 | { | |
c1aec834 | 118 | struct acpi_pci_root *root; |
d91a0078 | 119 | |
c1aec834 | 120 | list_for_each_entry(root, &acpi_pci_roots, node) |
0705495d | 121 | if ((root->segment == (u16) seg) && (root->bus_nr == (u16) bus)) |
c1aec834 | 122 | return root->device->handle; |
d91a0078 JC |
123 | return NULL; |
124 | } | |
125 | ||
126 | EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle); | |
127 | ||
27558203 AC |
128 | /** |
129 | * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge | |
130 | * @handle - the ACPI CA node in question. | |
131 | * | |
132 | * Note: we could make this API take a struct acpi_device * instead, but | |
133 | * for now, it's more convenient to operate on an acpi_handle. | |
134 | */ | |
135 | int acpi_is_root_bridge(acpi_handle handle) | |
136 | { | |
137 | int ret; | |
138 | struct acpi_device *device; | |
139 | ||
140 | ret = acpi_bus_get_device(handle, &device); | |
141 | if (ret) | |
142 | return 0; | |
143 | ||
144 | ret = acpi_match_device_ids(device, root_device_ids); | |
145 | if (ret) | |
146 | return 0; | |
147 | else | |
148 | return 1; | |
149 | } | |
150 | EXPORT_SYMBOL_GPL(acpi_is_root_bridge); | |
151 | ||
1da177e4 | 152 | static acpi_status |
4be44fcd | 153 | get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) |
1da177e4 | 154 | { |
50dd0969 | 155 | int *busnr = data; |
1da177e4 LT |
156 | struct acpi_resource_address64 address; |
157 | ||
50eca3eb BM |
158 | if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 && |
159 | resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 && | |
160 | resource->type != ACPI_RESOURCE_TYPE_ADDRESS64) | |
1da177e4 LT |
161 | return AE_OK; |
162 | ||
163 | acpi_resource_to_address64(resource, &address); | |
4be44fcd LB |
164 | if ((address.address_length > 0) && |
165 | (address.resource_type == ACPI_BUS_NUMBER_RANGE)) | |
50eca3eb | 166 | *busnr = address.minimum; |
1da177e4 LT |
167 | |
168 | return AE_OK; | |
169 | } | |
170 | ||
f5eebbe1 BH |
171 | static acpi_status try_get_root_bridge_busnr(acpi_handle handle, |
172 | unsigned long long *bus) | |
1da177e4 LT |
173 | { |
174 | acpi_status status; | |
f5eebbe1 | 175 | int busnum; |
1da177e4 | 176 | |
f5eebbe1 | 177 | busnum = -1; |
4be44fcd LB |
178 | status = |
179 | acpi_walk_resources(handle, METHOD_NAME__CRS, | |
f5eebbe1 | 180 | get_root_bridge_busnr_callback, &busnum); |
1da177e4 LT |
181 | if (ACPI_FAILURE(status)) |
182 | return status; | |
183 | /* Check if we really get a bus number from _CRS */ | |
f5eebbe1 | 184 | if (busnum == -1) |
1da177e4 | 185 | return AE_ERROR; |
f5eebbe1 | 186 | *bus = busnum; |
1da177e4 LT |
187 | return AE_OK; |
188 | } | |
189 | ||
2786f6e3 RZ |
190 | static void acpi_pci_bridge_scan(struct acpi_device *device) |
191 | { | |
192 | int status; | |
193 | struct acpi_device *child = NULL; | |
194 | ||
195 | if (device->flags.bus_address) | |
196 | if (device->parent && device->parent->ops.bind) { | |
197 | status = device->parent->ops.bind(device); | |
198 | if (!status) { | |
199 | list_for_each_entry(child, &device->children, node) | |
200 | acpi_pci_bridge_scan(child); | |
201 | } | |
202 | } | |
203 | } | |
204 | ||
63f10f0f KK |
205 | static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40, |
206 | 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66}; | |
207 | ||
208 | static acpi_status acpi_pci_run_osc(acpi_handle handle, | |
209 | const u32 *capbuf, u32 *retval) | |
210 | { | |
211 | acpi_status status; | |
212 | struct acpi_object_list input; | |
213 | union acpi_object in_params[4]; | |
214 | struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; | |
215 | union acpi_object *out_obj; | |
216 | u32 errors; | |
217 | ||
218 | /* Setting up input parameters */ | |
219 | input.count = 4; | |
220 | input.pointer = in_params; | |
221 | in_params[0].type = ACPI_TYPE_BUFFER; | |
222 | in_params[0].buffer.length = 16; | |
223 | in_params[0].buffer.pointer = OSC_UUID; | |
224 | in_params[1].type = ACPI_TYPE_INTEGER; | |
225 | in_params[1].integer.value = 1; | |
226 | in_params[2].type = ACPI_TYPE_INTEGER; | |
227 | in_params[2].integer.value = 3; | |
228 | in_params[3].type = ACPI_TYPE_BUFFER; | |
229 | in_params[3].buffer.length = 12; | |
230 | in_params[3].buffer.pointer = (u8 *)capbuf; | |
231 | ||
232 | status = acpi_evaluate_object(handle, "_OSC", &input, &output); | |
233 | if (ACPI_FAILURE(status)) | |
234 | return status; | |
235 | ||
236 | if (!output.length) | |
237 | return AE_NULL_OBJECT; | |
238 | ||
239 | out_obj = output.pointer; | |
240 | if (out_obj->type != ACPI_TYPE_BUFFER) { | |
241 | printk(KERN_DEBUG "_OSC evaluation returned wrong type\n"); | |
242 | status = AE_TYPE; | |
243 | goto out_kfree; | |
244 | } | |
245 | /* Need to ignore the bit0 in result code */ | |
246 | errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); | |
247 | if (errors) { | |
248 | if (errors & OSC_REQUEST_ERROR) | |
249 | printk(KERN_DEBUG "_OSC request failed\n"); | |
250 | if (errors & OSC_INVALID_UUID_ERROR) | |
251 | printk(KERN_DEBUG "_OSC invalid UUID\n"); | |
252 | if (errors & OSC_INVALID_REVISION_ERROR) | |
253 | printk(KERN_DEBUG "_OSC invalid revision\n"); | |
254 | if (errors & OSC_CAPABILITIES_MASK_ERROR) { | |
255 | if (capbuf[OSC_QUERY_TYPE] & OSC_QUERY_ENABLE) | |
256 | goto out_success; | |
257 | printk(KERN_DEBUG | |
258 | "Firmware did not grant requested _OSC control\n"); | |
259 | status = AE_SUPPORT; | |
260 | goto out_kfree; | |
261 | } | |
262 | status = AE_ERROR; | |
263 | goto out_kfree; | |
264 | } | |
265 | out_success: | |
266 | *retval = *((u32 *)(out_obj->buffer.pointer + 8)); | |
267 | status = AE_OK; | |
268 | ||
269 | out_kfree: | |
270 | kfree(output.pointer); | |
271 | return status; | |
272 | } | |
273 | ||
274 | static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, u32 flags) | |
275 | { | |
276 | acpi_status status; | |
277 | u32 support_set, result, capbuf[3]; | |
278 | ||
279 | /* do _OSC query for all possible controls */ | |
280 | support_set = root->osc_support_set | (flags & OSC_SUPPORT_MASKS); | |
281 | capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; | |
282 | capbuf[OSC_SUPPORT_TYPE] = support_set; | |
283 | capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS; | |
284 | ||
285 | status = acpi_pci_run_osc(root->device->handle, capbuf, &result); | |
286 | if (ACPI_SUCCESS(status)) { | |
287 | root->osc_support_set = support_set; | |
288 | root->osc_control_qry = result; | |
289 | root->osc_queried = 1; | |
290 | } | |
291 | return status; | |
292 | } | |
293 | ||
294 | static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags) | |
295 | { | |
296 | acpi_status status; | |
297 | acpi_handle tmp; | |
298 | ||
299 | status = acpi_get_handle(root->device->handle, "_OSC", &tmp); | |
300 | if (ACPI_FAILURE(status)) | |
301 | return status; | |
302 | mutex_lock(&osc_lock); | |
303 | status = acpi_pci_query_osc(root, flags); | |
304 | mutex_unlock(&osc_lock); | |
305 | return status; | |
306 | } | |
307 | ||
76d56de5 | 308 | struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle) |
63f10f0f KK |
309 | { |
310 | struct acpi_pci_root *root; | |
c1aec834 | 311 | |
63f10f0f KK |
312 | list_for_each_entry(root, &acpi_pci_roots, node) { |
313 | if (root->device->handle == handle) | |
314 | return root; | |
315 | } | |
316 | return NULL; | |
317 | } | |
76d56de5 | 318 | EXPORT_SYMBOL_GPL(acpi_pci_find_root); |
63f10f0f | 319 | |
2f7bbceb AC |
320 | struct acpi_handle_node { |
321 | struct list_head node; | |
322 | acpi_handle handle; | |
323 | }; | |
324 | ||
325 | /** | |
326 | * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev | |
327 | * @handle: the handle in question | |
328 | * | |
329 | * Given an ACPI CA handle, the desired PCI device is located in the | |
330 | * list of PCI devices. | |
331 | * | |
332 | * If the device is found, its reference count is increased and this | |
333 | * function returns a pointer to its data structure. The caller must | |
334 | * decrement the reference count by calling pci_dev_put(). | |
335 | * If no device is found, %NULL is returned. | |
336 | */ | |
337 | struct pci_dev *acpi_get_pci_dev(acpi_handle handle) | |
338 | { | |
339 | int dev, fn; | |
340 | unsigned long long adr; | |
341 | acpi_status status; | |
342 | acpi_handle phandle; | |
343 | struct pci_bus *pbus; | |
344 | struct pci_dev *pdev = NULL; | |
345 | struct acpi_handle_node *node, *tmp; | |
346 | struct acpi_pci_root *root; | |
347 | LIST_HEAD(device_list); | |
348 | ||
349 | /* | |
350 | * Walk up the ACPI CA namespace until we reach a PCI root bridge. | |
351 | */ | |
352 | phandle = handle; | |
353 | while (!acpi_is_root_bridge(phandle)) { | |
354 | node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL); | |
355 | if (!node) | |
356 | goto out; | |
357 | ||
358 | INIT_LIST_HEAD(&node->node); | |
359 | node->handle = phandle; | |
360 | list_add(&node->node, &device_list); | |
361 | ||
362 | status = acpi_get_parent(phandle, &phandle); | |
363 | if (ACPI_FAILURE(status)) | |
364 | goto out; | |
365 | } | |
366 | ||
367 | root = acpi_pci_find_root(phandle); | |
368 | if (!root) | |
369 | goto out; | |
370 | ||
371 | pbus = root->bus; | |
372 | ||
373 | /* | |
374 | * Now, walk back down the PCI device tree until we return to our | |
375 | * original handle. Assumes that everything between the PCI root | |
376 | * bridge and the device we're looking for must be a P2P bridge. | |
377 | */ | |
378 | list_for_each_entry(node, &device_list, node) { | |
379 | acpi_handle hnd = node->handle; | |
380 | status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr); | |
381 | if (ACPI_FAILURE(status)) | |
382 | goto out; | |
383 | dev = (adr >> 16) & 0xffff; | |
384 | fn = adr & 0xffff; | |
385 | ||
386 | pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn)); | |
412af978 | 387 | if (!pdev || hnd == handle) |
2f7bbceb AC |
388 | break; |
389 | ||
390 | pbus = pdev->subordinate; | |
391 | pci_dev_put(pdev); | |
392 | } | |
393 | out: | |
394 | list_for_each_entry_safe(node, tmp, &device_list, node) | |
395 | kfree(node); | |
396 | ||
397 | return pdev; | |
398 | } | |
399 | EXPORT_SYMBOL_GPL(acpi_get_pci_dev); | |
400 | ||
63f10f0f | 401 | /** |
9f5404d8 | 402 | * acpi_pci_osc_control_set - commit requested control to Firmware |
63f10f0f KK |
403 | * @handle: acpi_handle for the target ACPI object |
404 | * @flags: driver's requested control bits | |
405 | * | |
406 | * Attempt to take control from Firmware on requested control bits. | |
407 | **/ | |
9f5404d8 | 408 | acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 flags) |
63f10f0f KK |
409 | { |
410 | acpi_status status; | |
411 | u32 control_req, result, capbuf[3]; | |
412 | acpi_handle tmp; | |
413 | struct acpi_pci_root *root; | |
414 | ||
415 | status = acpi_get_handle(handle, "_OSC", &tmp); | |
416 | if (ACPI_FAILURE(status)) | |
417 | return status; | |
418 | ||
419 | control_req = (flags & OSC_CONTROL_MASKS); | |
420 | if (!control_req) | |
421 | return AE_TYPE; | |
422 | ||
423 | root = acpi_pci_find_root(handle); | |
424 | if (!root) | |
425 | return AE_NOT_EXIST; | |
426 | ||
427 | mutex_lock(&osc_lock); | |
428 | /* No need to evaluate _OSC if the control was already granted. */ | |
429 | if ((root->osc_control_set & control_req) == control_req) | |
430 | goto out; | |
431 | ||
432 | /* Need to query controls first before requesting them */ | |
433 | if (!root->osc_queried) { | |
434 | status = acpi_pci_query_osc(root, root->osc_support_set); | |
435 | if (ACPI_FAILURE(status)) | |
436 | goto out; | |
437 | } | |
438 | if ((root->osc_control_qry & control_req) != control_req) { | |
439 | printk(KERN_DEBUG | |
440 | "Firmware did not grant requested _OSC control\n"); | |
441 | status = AE_SUPPORT; | |
442 | goto out; | |
443 | } | |
444 | ||
445 | capbuf[OSC_QUERY_TYPE] = 0; | |
446 | capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set; | |
447 | capbuf[OSC_CONTROL_TYPE] = root->osc_control_set | control_req; | |
448 | status = acpi_pci_run_osc(handle, capbuf, &result); | |
449 | if (ACPI_SUCCESS(status)) | |
450 | root->osc_control_set = result; | |
451 | out: | |
452 | mutex_unlock(&osc_lock); | |
453 | return status; | |
454 | } | |
9f5404d8 | 455 | EXPORT_SYMBOL(acpi_pci_osc_control_set); |
63f10f0f | 456 | |
b5678a34 | 457 | static int __devinit acpi_pci_root_add(struct acpi_device *device) |
1da177e4 | 458 | { |
f5eebbe1 BH |
459 | unsigned long long segment, bus; |
460 | acpi_status status; | |
461 | int result; | |
462 | struct acpi_pci_root *root; | |
463 | acpi_handle handle; | |
2786f6e3 | 464 | struct acpi_device *child; |
0ef5f8f6 | 465 | u32 flags, base_flags; |
1da177e4 | 466 | |
f5eebbe1 BH |
467 | segment = 0; |
468 | status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL, | |
469 | &segment); | |
470 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
471 | printk(KERN_ERR PREFIX "can't evaluate _SEG\n"); | |
472 | return -ENODEV; | |
473 | } | |
1da177e4 | 474 | |
f5eebbe1 BH |
475 | /* Check _CRS first, then _BBN. If no _BBN, default to zero. */ |
476 | bus = 0; | |
477 | status = try_get_root_bridge_busnr(device->handle, &bus); | |
478 | if (ACPI_FAILURE(status)) { | |
479 | status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, NULL, &bus); | |
480 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
481 | printk(KERN_ERR PREFIX | |
482 | "no bus number in _CRS and can't evaluate _BBN\n"); | |
483 | return -ENODEV; | |
484 | } | |
485 | } | |
1da177e4 | 486 | |
36bcbec7 | 487 | root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); |
1da177e4 | 488 | if (!root) |
d550d98d | 489 | return -ENOMEM; |
1da177e4 | 490 | |
f5eebbe1 | 491 | INIT_LIST_HEAD(&root->node); |
32917e5b | 492 | root->device = device; |
0705495d BH |
493 | root->segment = segment & 0xFFFF; |
494 | root->bus_nr = bus & 0xFF; | |
1da177e4 LT |
495 | strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); |
496 | strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); | |
db89b4f0 | 497 | device->driver_data = root; |
1da177e4 | 498 | |
990a7ac5 AP |
499 | /* |
500 | * All supported architectures that use ACPI have support for | |
501 | * PCI domains, so we indicate this in _OSC support capabilities. | |
502 | */ | |
0ef5f8f6 | 503 | flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT; |
63f10f0f | 504 | acpi_pci_osc_support(root, flags); |
990a7ac5 | 505 | |
1da177e4 LT |
506 | /* |
507 | * TBD: Need PCI interface for enumeration/configuration of roots. | |
508 | */ | |
509 | ||
4be44fcd LB |
510 | /* TBD: Locking */ |
511 | list_add_tail(&root->node, &acpi_pci_roots); | |
1da177e4 | 512 | |
4be44fcd LB |
513 | printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n", |
514 | acpi_device_name(device), acpi_device_bid(device), | |
0705495d | 515 | root->segment, root->bus_nr); |
1da177e4 LT |
516 | |
517 | /* | |
518 | * Scan the Root Bridge | |
519 | * -------------------- | |
520 | * Must do this prior to any attempt to bind the root device, as the | |
521 | * PCI namespace does not get created until this call is made (and | |
522 | * thus the root bridge's pci_dev does not exist). | |
523 | */ | |
0705495d | 524 | root->bus = pci_acpi_scan_root(device, segment, bus); |
1da177e4 | 525 | if (!root->bus) { |
6468463a LB |
526 | printk(KERN_ERR PREFIX |
527 | "Bus %04x:%02x not present in PCI namespace\n", | |
0705495d | 528 | root->segment, root->bus_nr); |
1da177e4 LT |
529 | result = -ENODEV; |
530 | goto end; | |
531 | } | |
532 | ||
533 | /* | |
534 | * Attach ACPI-PCI Context | |
535 | * ----------------------- | |
536 | * Thus binding the ACPI and PCI devices. | |
537 | */ | |
499650de | 538 | result = acpi_pci_bind_root(device); |
1da177e4 LT |
539 | if (result) |
540 | goto end; | |
541 | ||
542 | /* | |
543 | * PCI Routing Table | |
544 | * ----------------- | |
545 | * Evaluate and parse _PRT, if exists. | |
546 | */ | |
2d1e0a02 | 547 | status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle); |
1da177e4 | 548 | if (ACPI_SUCCESS(status)) |
859a3f86 | 549 | result = acpi_pci_irq_add_prt(device->handle, root->bus); |
1da177e4 | 550 | |
2786f6e3 RZ |
551 | /* |
552 | * Scan and bind all _ADR-Based Devices | |
553 | */ | |
554 | list_for_each_entry(child, &device->children, node) | |
555 | acpi_pci_bridge_scan(child); | |
556 | ||
0ef5f8f6 AP |
557 | /* Indicate support for various _OSC capabilities. */ |
558 | if (pci_ext_cfg_avail(root->bus->self)) | |
559 | flags |= OSC_EXT_PCI_CONFIG_SUPPORT; | |
3e1b1600 AP |
560 | if (pcie_aspm_enabled()) |
561 | flags |= OSC_ACTIVE_STATE_PWR_SUPPORT | | |
562 | OSC_CLOCK_PWR_CAPABILITY_SUPPORT; | |
07ae95f9 AP |
563 | if (pci_msi_enabled()) |
564 | flags |= OSC_MSI_SUPPORT; | |
0ef5f8f6 | 565 | if (flags != base_flags) |
63f10f0f | 566 | acpi_pci_osc_support(root, flags); |
0ef5f8f6 | 567 | |
f5eebbe1 | 568 | return 0; |
1da177e4 | 569 | |
f5eebbe1 BH |
570 | end: |
571 | if (!list_empty(&root->node)) | |
572 | list_del(&root->node); | |
573 | kfree(root); | |
d550d98d | 574 | return result; |
1da177e4 LT |
575 | } |
576 | ||
4be44fcd | 577 | static int acpi_pci_root_start(struct acpi_device *device) |
c431ada4 | 578 | { |
caf420c6 | 579 | struct acpi_pci_root *root = acpi_driver_data(device); |
c431ada4 | 580 | |
caf420c6 BH |
581 | pci_bus_add_devices(root->bus); |
582 | return 0; | |
c431ada4 | 583 | } |
1da177e4 | 584 | |
4be44fcd | 585 | static int acpi_pci_root_remove(struct acpi_device *device, int type) |
1da177e4 | 586 | { |
caf420c6 | 587 | struct acpi_pci_root *root = acpi_driver_data(device); |
1da177e4 LT |
588 | |
589 | kfree(root); | |
d550d98d | 590 | return 0; |
1da177e4 LT |
591 | } |
592 | ||
4be44fcd | 593 | static int __init acpi_pci_root_init(void) |
1da177e4 | 594 | { |
1da177e4 | 595 | if (acpi_pci_disabled) |
d550d98d | 596 | return 0; |
1da177e4 | 597 | |
1da177e4 | 598 | if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0) |
d550d98d | 599 | return -ENODEV; |
1da177e4 | 600 | |
d550d98d | 601 | return 0; |
1da177e4 LT |
602 | } |
603 | ||
604 | subsys_initcall(acpi_pci_root_init); |