aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/acpi/pci_root.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/acpi/pci_root.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/acpi/pci_root.c')
-rw-r--r--drivers/acpi/pci_root.c347
1 files changed, 347 insertions, 0 deletions
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
new file mode 100644
index 000000000000..7e6b8e3b2ed4
--- /dev/null
+++ b/drivers/acpi/pci_root.c
@@ -0,0 +1,347 @@
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
40ACPI_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
47static int acpi_pci_root_add (struct acpi_device *device);
48static int acpi_pci_root_remove (struct acpi_device *device, int type);
49
50static 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
60struct 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
67static LIST_HEAD(acpi_pci_roots);
68
69static struct acpi_pci_driver *sub_driver;
70
71int 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}
93EXPORT_SYMBOL(acpi_pci_register_driver);
94
95void 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}
116EXPORT_SYMBOL(acpi_pci_unregister_driver);
117
118static acpi_status
119get_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
137static acpi_status
138try_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
152static int
153acpi_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
300end:
301 if (result)
302 kfree(root);
303
304 return_VALUE(result);
305}
306
307
308static int
309acpi_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
328static 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
346subsys_initcall(acpi_pci_root_init);
347