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