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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 |
4be44fcd | 39 | ACPI_MODULE_NAME("pci_root") |
1da177e4 LT |
40 | #define ACPI_PCI_ROOT_CLASS "pci_bridge" |
41 | #define ACPI_PCI_ROOT_HID "PNP0A03" | |
42 | #define ACPI_PCI_ROOT_DRIVER_NAME "ACPI PCI Root Bridge Driver" | |
43 | #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge" | |
4be44fcd LB |
44 | static int acpi_pci_root_add(struct acpi_device *device); |
45 | static int acpi_pci_root_remove(struct acpi_device *device, int type); | |
46 | static int acpi_pci_root_start(struct acpi_device *device); | |
1da177e4 LT |
47 | |
48 | static struct acpi_driver acpi_pci_root_driver = { | |
4be44fcd LB |
49 | .name = ACPI_PCI_ROOT_DRIVER_NAME, |
50 | .class = ACPI_PCI_ROOT_CLASS, | |
51 | .ids = ACPI_PCI_ROOT_HID, | |
52 | .ops = { | |
53 | .add = acpi_pci_root_add, | |
54 | .remove = acpi_pci_root_remove, | |
55 | .start = acpi_pci_root_start, | |
56 | }, | |
1da177e4 LT |
57 | }; |
58 | ||
59 | struct acpi_pci_root { | |
4be44fcd LB |
60 | struct list_head node; |
61 | acpi_handle handle; | |
62 | struct acpi_pci_id id; | |
63 | struct pci_bus *bus; | |
1da177e4 LT |
64 | }; |
65 | ||
66 | static LIST_HEAD(acpi_pci_roots); | |
67 | ||
68 | static struct acpi_pci_driver *sub_driver; | |
69 | ||
70 | int acpi_pci_register_driver(struct acpi_pci_driver *driver) | |
71 | { | |
72 | int n = 0; | |
73 | struct list_head *entry; | |
74 | ||
75 | struct acpi_pci_driver **pptr = &sub_driver; | |
76 | while (*pptr) | |
77 | pptr = &(*pptr)->next; | |
78 | *pptr = driver; | |
79 | ||
80 | if (!driver->add) | |
81 | return 0; | |
82 | ||
83 | list_for_each(entry, &acpi_pci_roots) { | |
84 | struct acpi_pci_root *root; | |
85 | root = list_entry(entry, struct acpi_pci_root, node); | |
86 | driver->add(root->handle); | |
87 | n++; | |
88 | } | |
89 | ||
90 | return n; | |
91 | } | |
4be44fcd | 92 | |
1da177e4 LT |
93 | EXPORT_SYMBOL(acpi_pci_register_driver); |
94 | ||
95 | void acpi_pci_unregister_driver(struct acpi_pci_driver *driver) | |
96 | { | |
97 | struct list_head *entry; | |
98 | ||
99 | struct acpi_pci_driver **pptr = &sub_driver; | |
100 | while (*pptr) { | |
101 | if (*pptr != driver) | |
102 | continue; | |
103 | *pptr = (*pptr)->next; | |
104 | break; | |
105 | } | |
106 | ||
107 | if (!driver->remove) | |
108 | return; | |
109 | ||
110 | list_for_each(entry, &acpi_pci_roots) { | |
111 | struct acpi_pci_root *root; | |
112 | root = list_entry(entry, struct acpi_pci_root, node); | |
113 | driver->remove(root->handle); | |
114 | } | |
115 | } | |
4be44fcd | 116 | |
1da177e4 LT |
117 | EXPORT_SYMBOL(acpi_pci_unregister_driver); |
118 | ||
119 | static acpi_status | |
4be44fcd | 120 | get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) |
1da177e4 LT |
121 | { |
122 | int *busnr = (int *)data; | |
123 | struct acpi_resource_address64 address; | |
124 | ||
50eca3eb BM |
125 | if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 && |
126 | resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 && | |
127 | resource->type != ACPI_RESOURCE_TYPE_ADDRESS64) | |
1da177e4 LT |
128 | return AE_OK; |
129 | ||
130 | acpi_resource_to_address64(resource, &address); | |
4be44fcd LB |
131 | if ((address.address_length > 0) && |
132 | (address.resource_type == ACPI_BUS_NUMBER_RANGE)) | |
50eca3eb | 133 | *busnr = address.minimum; |
1da177e4 LT |
134 | |
135 | return AE_OK; | |
136 | } | |
137 | ||
4be44fcd | 138 | static acpi_status try_get_root_bridge_busnr(acpi_handle handle, int *busnum) |
1da177e4 LT |
139 | { |
140 | acpi_status status; | |
141 | ||
142 | *busnum = -1; | |
4be44fcd LB |
143 | status = |
144 | acpi_walk_resources(handle, METHOD_NAME__CRS, | |
145 | get_root_bridge_busnr_callback, busnum); | |
1da177e4 LT |
146 | if (ACPI_FAILURE(status)) |
147 | return status; | |
148 | /* Check if we really get a bus number from _CRS */ | |
149 | if (*busnum == -1) | |
150 | return AE_ERROR; | |
151 | return AE_OK; | |
152 | } | |
153 | ||
4be44fcd | 154 | static int acpi_pci_root_add(struct acpi_device *device) |
1da177e4 | 155 | { |
4be44fcd LB |
156 | int result = 0; |
157 | struct acpi_pci_root *root = NULL; | |
158 | struct acpi_pci_root *tmp; | |
159 | acpi_status status = AE_OK; | |
160 | unsigned long value = 0; | |
161 | acpi_handle handle = NULL; | |
1da177e4 | 162 | |
1da177e4 LT |
163 | |
164 | if (!device) | |
d550d98d | 165 | return -EINVAL; |
1da177e4 LT |
166 | |
167 | root = kmalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); | |
168 | if (!root) | |
d550d98d | 169 | return -ENOMEM; |
1da177e4 | 170 | memset(root, 0, sizeof(struct acpi_pci_root)); |
c431ada4 | 171 | INIT_LIST_HEAD(&root->node); |
1da177e4 LT |
172 | |
173 | root->handle = device->handle; | |
174 | strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); | |
175 | strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); | |
176 | acpi_driver_data(device) = root; | |
177 | ||
178 | /* | |
179 | * TBD: Doesn't the bus driver automatically set this? | |
180 | */ | |
181 | device->ops.bind = acpi_pci_bind; | |
182 | ||
183 | /* | |
184 | * Segment | |
185 | * ------- | |
186 | * Obtained via _SEG, if exists, otherwise assumed to be zero (0). | |
187 | */ | |
4be44fcd LB |
188 | status = acpi_evaluate_integer(root->handle, METHOD_NAME__SEG, NULL, |
189 | &value); | |
1da177e4 LT |
190 | switch (status) { |
191 | case AE_OK: | |
192 | root->id.segment = (u16) value; | |
193 | break; | |
194 | case AE_NOT_FOUND: | |
4be44fcd LB |
195 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
196 | "Assuming segment 0 (no _SEG)\n")); | |
1da177e4 LT |
197 | root->id.segment = 0; |
198 | break; | |
199 | default: | |
a6fc6720 | 200 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SEG")); |
1da177e4 LT |
201 | result = -ENODEV; |
202 | goto end; | |
203 | } | |
204 | ||
205 | /* | |
206 | * Bus | |
207 | * --- | |
208 | * Obtained via _BBN, if exists, otherwise assumed to be zero (0). | |
209 | */ | |
4be44fcd LB |
210 | status = acpi_evaluate_integer(root->handle, METHOD_NAME__BBN, NULL, |
211 | &value); | |
1da177e4 LT |
212 | switch (status) { |
213 | case AE_OK: | |
214 | root->id.bus = (u16) value; | |
215 | break; | |
216 | case AE_NOT_FOUND: | |
217 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Assuming bus 0 (no _BBN)\n")); | |
218 | root->id.bus = 0; | |
219 | break; | |
220 | default: | |
a6fc6720 | 221 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BBN")); |
1da177e4 LT |
222 | result = -ENODEV; |
223 | goto end; | |
224 | } | |
225 | ||
226 | /* Some systems have wrong _BBN */ | |
227 | list_for_each_entry(tmp, &acpi_pci_roots, node) { | |
228 | if ((tmp->id.segment == root->id.segment) | |
4be44fcd | 229 | && (tmp->id.bus == root->id.bus)) { |
1da177e4 LT |
230 | int bus = 0; |
231 | acpi_status status; | |
232 | ||
6468463a | 233 | printk(KERN_ERR PREFIX |
a6fc6720 | 234 | "Wrong _BBN value, reboot" |
6468463a | 235 | " and use option 'pci=noacpi'\n"); |
1da177e4 LT |
236 | |
237 | status = try_get_root_bridge_busnr(root->handle, &bus); | |
238 | if (ACPI_FAILURE(status)) | |
239 | break; | |
240 | if (bus != root->id.bus) { | |
4be44fcd LB |
241 | printk(KERN_INFO PREFIX |
242 | "PCI _CRS %d overrides _BBN 0\n", bus); | |
1da177e4 LT |
243 | root->id.bus = bus; |
244 | } | |
245 | break; | |
246 | } | |
247 | } | |
248 | /* | |
249 | * Device & Function | |
250 | * ----------------- | |
251 | * Obtained from _ADR (which has already been evaluated for us). | |
252 | */ | |
253 | root->id.device = device->pnp.bus_address >> 16; | |
254 | root->id.function = device->pnp.bus_address & 0xFFFF; | |
255 | ||
256 | /* | |
257 | * TBD: Need PCI interface for enumeration/configuration of roots. | |
258 | */ | |
259 | ||
4be44fcd LB |
260 | /* TBD: Locking */ |
261 | list_add_tail(&root->node, &acpi_pci_roots); | |
1da177e4 | 262 | |
4be44fcd LB |
263 | printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n", |
264 | acpi_device_name(device), acpi_device_bid(device), | |
265 | root->id.segment, root->id.bus); | |
1da177e4 LT |
266 | |
267 | /* | |
268 | * Scan the Root Bridge | |
269 | * -------------------- | |
270 | * Must do this prior to any attempt to bind the root device, as the | |
271 | * PCI namespace does not get created until this call is made (and | |
272 | * thus the root bridge's pci_dev does not exist). | |
273 | */ | |
274 | root->bus = pci_acpi_scan_root(device, root->id.segment, root->id.bus); | |
275 | if (!root->bus) { | |
6468463a LB |
276 | printk(KERN_ERR PREFIX |
277 | "Bus %04x:%02x not present in PCI namespace\n", | |
278 | root->id.segment, root->id.bus); | |
1da177e4 LT |
279 | result = -ENODEV; |
280 | goto end; | |
281 | } | |
282 | ||
283 | /* | |
284 | * Attach ACPI-PCI Context | |
285 | * ----------------------- | |
286 | * Thus binding the ACPI and PCI devices. | |
287 | */ | |
288 | result = acpi_pci_bind_root(device, &root->id, root->bus); | |
289 | if (result) | |
290 | goto end; | |
291 | ||
292 | /* | |
293 | * PCI Routing Table | |
294 | * ----------------- | |
295 | * Evaluate and parse _PRT, if exists. | |
296 | */ | |
297 | status = acpi_get_handle(root->handle, METHOD_NAME__PRT, &handle); | |
298 | if (ACPI_SUCCESS(status)) | |
299 | result = acpi_pci_irq_add_prt(root->handle, root->id.segment, | |
4be44fcd | 300 | root->id.bus); |
1da177e4 | 301 | |
4be44fcd | 302 | end: |
c431ada4 RS |
303 | if (result) { |
304 | if (!list_empty(&root->node)) | |
305 | list_del(&root->node); | |
1da177e4 | 306 | kfree(root); |
c431ada4 | 307 | } |
1da177e4 | 308 | |
d550d98d | 309 | return result; |
1da177e4 LT |
310 | } |
311 | ||
4be44fcd | 312 | static int acpi_pci_root_start(struct acpi_device *device) |
c431ada4 | 313 | { |
4be44fcd | 314 | struct acpi_pci_root *root; |
c431ada4 | 315 | |
c431ada4 RS |
316 | |
317 | list_for_each_entry(root, &acpi_pci_roots, node) { | |
318 | if (root->handle == device->handle) { | |
319 | pci_bus_add_devices(root->bus); | |
d550d98d | 320 | return 0; |
c431ada4 RS |
321 | } |
322 | } | |
d550d98d | 323 | return -ENODEV; |
c431ada4 | 324 | } |
1da177e4 | 325 | |
4be44fcd | 326 | static int acpi_pci_root_remove(struct acpi_device *device, int type) |
1da177e4 | 327 | { |
4be44fcd | 328 | struct acpi_pci_root *root = NULL; |
1da177e4 | 329 | |
1da177e4 LT |
330 | |
331 | if (!device || !acpi_driver_data(device)) | |
d550d98d | 332 | return -EINVAL; |
1da177e4 | 333 | |
4be44fcd | 334 | root = (struct acpi_pci_root *)acpi_driver_data(device); |
1da177e4 LT |
335 | |
336 | kfree(root); | |
337 | ||
d550d98d | 338 | return 0; |
1da177e4 LT |
339 | } |
340 | ||
4be44fcd | 341 | static int __init acpi_pci_root_init(void) |
1da177e4 | 342 | { |
1da177e4 LT |
343 | |
344 | if (acpi_pci_disabled) | |
d550d98d | 345 | return 0; |
1da177e4 LT |
346 | |
347 | /* DEBUG: | |
4be44fcd LB |
348 | acpi_dbg_layer = ACPI_PCI_COMPONENT; |
349 | acpi_dbg_level = 0xFFFFFFFF; | |
1da177e4 LT |
350 | */ |
351 | ||
352 | if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0) | |
d550d98d | 353 | return -ENODEV; |
1da177e4 | 354 | |
d550d98d | 355 | return 0; |
1da177e4 LT |
356 | } |
357 | ||
358 | subsys_initcall(acpi_pci_root_init); |