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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 | ||
38 | ||
39 | #define _COMPONENT ACPI_PCI_COMPONENT | |
40 | ACPI_MODULE_NAME ("pci_root") | |
41 | ||
42 | #define ACPI_PCI_ROOT_CLASS "pci_bridge" | |
43 | #define ACPI_PCI_ROOT_HID "PNP0A03" | |
44 | #define ACPI_PCI_ROOT_DRIVER_NAME "ACPI PCI Root Bridge Driver" | |
45 | #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge" | |
46 | ||
47 | static int acpi_pci_root_add (struct acpi_device *device); | |
48 | static int acpi_pci_root_remove (struct acpi_device *device, int type); | |
49 | ||
50 | static struct acpi_driver acpi_pci_root_driver = { | |
51 | .name = ACPI_PCI_ROOT_DRIVER_NAME, | |
52 | .class = ACPI_PCI_ROOT_CLASS, | |
53 | .ids = ACPI_PCI_ROOT_HID, | |
54 | .ops = { | |
55 | .add = acpi_pci_root_add, | |
56 | .remove = acpi_pci_root_remove, | |
57 | }, | |
58 | }; | |
59 | ||
60 | struct acpi_pci_root { | |
61 | struct list_head node; | |
62 | acpi_handle handle; | |
63 | struct acpi_pci_id id; | |
64 | struct pci_bus *bus; | |
65 | }; | |
66 | ||
67 | static LIST_HEAD(acpi_pci_roots); | |
68 | ||
69 | static struct acpi_pci_driver *sub_driver; | |
70 | ||
71 | int acpi_pci_register_driver(struct acpi_pci_driver *driver) | |
72 | { | |
73 | int n = 0; | |
74 | struct list_head *entry; | |
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 | ||
84 | list_for_each(entry, &acpi_pci_roots) { | |
85 | struct acpi_pci_root *root; | |
86 | root = list_entry(entry, struct acpi_pci_root, node); | |
87 | driver->add(root->handle); | |
88 | n++; | |
89 | } | |
90 | ||
91 | return n; | |
92 | } | |
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 | } | |
116 | EXPORT_SYMBOL(acpi_pci_unregister_driver); | |
117 | ||
118 | static acpi_status | |
119 | get_root_bridge_busnr_callback (struct acpi_resource *resource, void *data) | |
120 | { | |
121 | int *busnr = (int *)data; | |
122 | struct acpi_resource_address64 address; | |
123 | ||
124 | if (resource->id != ACPI_RSTYPE_ADDRESS16 && | |
125 | resource->id != ACPI_RSTYPE_ADDRESS32 && | |
126 | resource->id != ACPI_RSTYPE_ADDRESS64) | |
127 | return AE_OK; | |
128 | ||
129 | acpi_resource_to_address64(resource, &address); | |
130 | if ((address.address_length > 0) && | |
131 | (address.resource_type == ACPI_BUS_NUMBER_RANGE)) | |
132 | *busnr = address.min_address_range; | |
133 | ||
134 | return AE_OK; | |
135 | } | |
136 | ||
137 | static acpi_status | |
138 | try_get_root_bridge_busnr(acpi_handle handle, int *busnum) | |
139 | { | |
140 | acpi_status status; | |
141 | ||
142 | *busnum = -1; | |
143 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, get_root_bridge_busnr_callback, busnum); | |
144 | if (ACPI_FAILURE(status)) | |
145 | return status; | |
146 | /* Check if we really get a bus number from _CRS */ | |
147 | if (*busnum == -1) | |
148 | return AE_ERROR; | |
149 | return AE_OK; | |
150 | } | |
151 | ||
152 | static int | |
153 | acpi_pci_root_add ( | |
154 | struct acpi_device *device) | |
155 | { | |
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; | |
162 | ||
163 | ACPI_FUNCTION_TRACE("acpi_pci_root_add"); | |
164 | ||
165 | if (!device) | |
166 | return_VALUE(-EINVAL); | |
167 | ||
168 | root = kmalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); | |
169 | if (!root) | |
170 | return_VALUE(-ENOMEM); | |
171 | memset(root, 0, sizeof(struct acpi_pci_root)); | |
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 | */ | |
188 | status = acpi_evaluate_integer(root->handle, METHOD_NAME__SEG, NULL, | |
189 | &value); | |
190 | switch (status) { | |
191 | case AE_OK: | |
192 | root->id.segment = (u16) value; | |
193 | break; | |
194 | case AE_NOT_FOUND: | |
195 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
196 | "Assuming segment 0 (no _SEG)\n")); | |
197 | root->id.segment = 0; | |
198 | break; | |
199 | default: | |
200 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _SEG\n")); | |
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 | */ | |
210 | status = acpi_evaluate_integer(root->handle, METHOD_NAME__BBN, NULL, | |
211 | &value); | |
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: | |
221 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _BBN\n")); | |
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) | |
229 | && (tmp->id.bus == root->id.bus)) { | |
230 | int bus = 0; | |
231 | acpi_status status; | |
232 | ||
233 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
234 | "Wrong _BBN value, please reboot and using option 'pci=noacpi'\n")); | |
235 | ||
236 | status = try_get_root_bridge_busnr(root->handle, &bus); | |
237 | if (ACPI_FAILURE(status)) | |
238 | break; | |
239 | if (bus != root->id.bus) { | |
240 | printk(KERN_INFO PREFIX "PCI _CRS %d overrides _BBN 0\n", bus); | |
241 | root->id.bus = bus; | |
242 | } | |
243 | break; | |
244 | } | |
245 | } | |
246 | /* | |
247 | * Device & Function | |
248 | * ----------------- | |
249 | * Obtained from _ADR (which has already been evaluated for us). | |
250 | */ | |
251 | root->id.device = device->pnp.bus_address >> 16; | |
252 | root->id.function = device->pnp.bus_address & 0xFFFF; | |
253 | ||
254 | /* | |
255 | * TBD: Need PCI interface for enumeration/configuration of roots. | |
256 | */ | |
257 | ||
258 | /* TBD: Locking */ | |
259 | list_add_tail(&root->node, &acpi_pci_roots); | |
260 | ||
261 | printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n", | |
262 | acpi_device_name(device), acpi_device_bid(device), | |
263 | root->id.segment, root->id.bus); | |
264 | ||
265 | /* | |
266 | * Scan the Root Bridge | |
267 | * -------------------- | |
268 | * Must do this prior to any attempt to bind the root device, as the | |
269 | * PCI namespace does not get created until this call is made (and | |
270 | * thus the root bridge's pci_dev does not exist). | |
271 | */ | |
272 | root->bus = pci_acpi_scan_root(device, root->id.segment, root->id.bus); | |
273 | if (!root->bus) { | |
274 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
275 | "Bus %04x:%02x not present in PCI namespace\n", | |
276 | root->id.segment, root->id.bus)); | |
277 | result = -ENODEV; | |
278 | goto end; | |
279 | } | |
280 | ||
281 | /* | |
282 | * Attach ACPI-PCI Context | |
283 | * ----------------------- | |
284 | * Thus binding the ACPI and PCI devices. | |
285 | */ | |
286 | result = acpi_pci_bind_root(device, &root->id, root->bus); | |
287 | if (result) | |
288 | goto end; | |
289 | ||
290 | /* | |
291 | * PCI Routing Table | |
292 | * ----------------- | |
293 | * Evaluate and parse _PRT, if exists. | |
294 | */ | |
295 | status = acpi_get_handle(root->handle, METHOD_NAME__PRT, &handle); | |
296 | if (ACPI_SUCCESS(status)) | |
297 | result = acpi_pci_irq_add_prt(root->handle, root->id.segment, | |
298 | root->id.bus); | |
299 | ||
300 | end: | |
301 | if (result) | |
302 | kfree(root); | |
303 | ||
304 | return_VALUE(result); | |
305 | } | |
306 | ||
307 | ||
308 | static int | |
309 | acpi_pci_root_remove ( | |
310 | struct acpi_device *device, | |
311 | int type) | |
312 | { | |
313 | struct acpi_pci_root *root = NULL; | |
314 | ||
315 | ACPI_FUNCTION_TRACE("acpi_pci_root_remove"); | |
316 | ||
317 | if (!device || !acpi_driver_data(device)) | |
318 | return_VALUE(-EINVAL); | |
319 | ||
320 | root = (struct acpi_pci_root *) acpi_driver_data(device); | |
321 | ||
322 | kfree(root); | |
323 | ||
324 | return_VALUE(0); | |
325 | } | |
326 | ||
327 | ||
328 | static int __init acpi_pci_root_init (void) | |
329 | { | |
330 | ACPI_FUNCTION_TRACE("acpi_pci_root_init"); | |
331 | ||
332 | if (acpi_pci_disabled) | |
333 | return_VALUE(0); | |
334 | ||
335 | /* DEBUG: | |
336 | acpi_dbg_layer = ACPI_PCI_COMPONENT; | |
337 | acpi_dbg_level = 0xFFFFFFFF; | |
338 | */ | |
339 | ||
340 | if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0) | |
341 | return_VALUE(-ENODEV); | |
342 | ||
343 | return_VALUE(0); | |
344 | } | |
345 | ||
346 | subsys_initcall(acpi_pci_root_init); | |
347 |