1 /*
2 * pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 41 $)
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 extern struct pci_ops *pci_root_ops;
43
44 #define PREFIX "ACPI: "
45
46 static int acpi_pci_root_add (struct acpi_device *device);
47 static int acpi_pci_root_remove (struct acpi_device *device, int type);
48
49 static struct acpi_driver acpi_pci_root_driver = {
50 .name = ACPI_PCI_ROOT_DRIVER_NAME,
51 .class = ACPI_PCI_ROOT_CLASS,
52 .ids = ACPI_PCI_ROOT_HID,
53 .ops = {
54 .add = acpi_pci_root_add,
55 .remove = acpi_pci_root_remove,
56 },
57 };
58
59 struct acpi_pci_root {
60 struct list_head node;
61 acpi_handle handle;
62 struct acpi_pci_id id;
63 struct pci_bus *bus;
64 };
65
66 static LIST_HEAD(acpi_pci_roots);
67
68 static struct acpi_pci_driver *sub_driver;
69
acpi_pci_register_driver(struct acpi_pci_driver * driver)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 }
92
acpi_pci_unregister_driver(struct acpi_pci_driver * driver)93 void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
94 {
95 struct list_head *entry;
96
97 struct acpi_pci_driver **pptr = &sub_driver;
98 while (*pptr) {
99 if (*pptr != driver)
100 continue;
101 *pptr = (*pptr)->next;
102 break;
103 }
104
105 if (!driver->remove)
106 return;
107
108 list_for_each(entry, &acpi_pci_roots) {
109 struct acpi_pci_root *root;
110 root = list_entry(entry, struct acpi_pci_root, node);
111 driver->remove(root->handle);
112 }
113 }
114
115 static acpi_status
get_root_bridge_busnr_callback(struct acpi_resource * resource,void * data)116 get_root_bridge_busnr_callback (struct acpi_resource *resource, void *data)
117 {
118 int *busnr = (int *)data;
119 struct acpi_resource_address64 address;
120
121 if (resource->id != ACPI_RSTYPE_ADDRESS16 &&
122 resource->id != ACPI_RSTYPE_ADDRESS32 &&
123 resource->id != ACPI_RSTYPE_ADDRESS64)
124 return AE_OK;
125
126 acpi_resource_to_address64(resource, &address);
127 if ((address.address_length > 0) &&
128 (address.resource_type == ACPI_BUS_NUMBER_RANGE))
129 *busnr = address.min_address_range;
130
131 return AE_OK;
132 }
133
134 static acpi_status
try_get_root_bridge_busnr(acpi_handle handle,int * busnum)135 try_get_root_bridge_busnr(acpi_handle handle, int *busnum)
136 {
137 acpi_status status;
138
139 *busnum = -1;
140 status = acpi_walk_resources(handle, METHOD_NAME__CRS, get_root_bridge_busnr_callback, busnum);
141 if (ACPI_FAILURE(status))
142 return status;
143 /* Check if we really get a bus number from _CRS */
144 if (*busnum == -1)
145 return AE_ERROR;
146 return AE_OK;
147 }
148
149 static int
acpi_pci_root_add(struct acpi_device * device)150 acpi_pci_root_add (
151 struct acpi_device *device)
152 {
153 int result = 0;
154 struct acpi_pci_root *root = NULL;
155 struct acpi_pci_root *tmp;
156 acpi_status status = AE_OK;
157 unsigned long value = 0;
158 acpi_handle handle = NULL;
159
160 ACPI_FUNCTION_TRACE("acpi_pci_root_add");
161
162 if (!device)
163 return_VALUE(-EINVAL);
164
165 root = kmalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
166 if (!root)
167 return_VALUE(-ENOMEM);
168 memset(root, 0, sizeof(struct acpi_pci_root));
169
170 root->handle = device->handle;
171 sprintf(acpi_device_name(device), "%s", ACPI_PCI_ROOT_DEVICE_NAME);
172 sprintf(acpi_device_class(device), "%s", ACPI_PCI_ROOT_CLASS);
173 acpi_driver_data(device) = root;
174
175 /*
176 * TBD: Doesn't the bus driver automatically set this?
177 */
178 device->ops.bind = acpi_pci_bind;
179
180 /*
181 * Segment
182 * -------
183 * Obtained via _SEG, if exists, otherwise assumed to be zero (0).
184 */
185 status = acpi_evaluate_integer(root->handle, METHOD_NAME__SEG, NULL,
186 &value);
187 switch (status) {
188 case AE_OK:
189 root->id.segment = (u16) value;
190 break;
191 case AE_NOT_FOUND:
192 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
193 "Assuming segment 0 (no _SEG)\n"));
194 root->id.segment = 0;
195 break;
196 default:
197 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _SEG\n"));
198 result = -ENODEV;
199 goto end;
200 }
201
202 /*
203 * Bus
204 * ---
205 * Obtained via _BBN, if exists, otherwise assumed to be zero (0).
206 */
207 status = acpi_evaluate_integer(root->handle, METHOD_NAME__BBN, NULL,
208 &value);
209 switch (status) {
210 case AE_OK:
211 root->id.bus = (u16) value;
212 break;
213 case AE_NOT_FOUND:
214 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Assuming bus 0 (no _BBN)\n"));
215 root->id.bus = 0;
216 break;
217 default:
218 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _BBN\n"));
219 result = -ENODEV;
220 goto end;
221 }
222
223 /* Some systems have wrong _BBN */
224 list_for_each_entry(tmp, &acpi_pci_roots, node) {
225 if ((tmp->id.segment == root->id.segment)
226 && (tmp->id.bus == root->id.bus)) {
227 int bus = 0;
228 acpi_status status;
229
230 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
231 "Wrong _BBN value, please reboot and using option 'pci=noacpi'\n"));
232
233 status = try_get_root_bridge_busnr(root->handle, &bus);
234 if (ACPI_FAILURE(status))
235 break;
236 if (bus != root->id.bus) {
237 printk(KERN_INFO PREFIX "PCI _CRS %d overrides _BBN 0\n", bus);
238 root->id.bus = bus;
239 }
240 break;
241 }
242 }
243
244 /*
245 * Device & Function
246 * -----------------
247 * Obtained from _ADR (which has already been evaluated for us).
248 */
249 root->id.device = device->pnp.bus_address >> 16;
250 root->id.function = device->pnp.bus_address & 0xFFFF;
251
252 /*
253 * TBD: Need PCI interface for enumeration/configuration of roots.
254 */
255
256 /* TBD: Locking */
257 list_add_tail(&root->node, &acpi_pci_roots);
258
259 printk(KERN_INFO PREFIX "%s [%s] (%02x:%02x)\n",
260 acpi_device_name(device), acpi_device_bid(device),
261 root->id.segment, root->id.bus);
262
263 /*
264 * Scan the Root Bridge
265 * --------------------
266 * Must do this prior to any attempt to bind the root device, as the
267 * PCI namespace does not get created until this call is made (and
268 * thus the root bridge's pci_dev does not exist).
269 */
270 #ifdef CONFIG_X86
271 root->bus = pcibios_scan_root(root->id.bus);
272 #else
273 root->bus = pcibios_scan_root(root->handle,
274 root->id.segment, root->id.bus);
275 #endif
276 if (!root->bus) {
277 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
278 "Bus %02x:%02x not present in PCI namespace\n",
279 root->id.segment, root->id.bus));
280 result = -ENODEV;
281 goto end;
282 }
283
284 /*
285 * Attach ACPI-PCI Context
286 * -----------------------
287 * Thus binding the ACPI and PCI devices.
288 */
289 result = acpi_pci_bind_root(device, &root->id, root->bus);
290 if (result)
291 goto end;
292
293 /*
294 * PCI Routing Table
295 * -----------------
296 * Evaluate and parse _PRT, if exists.
297 */
298 status = acpi_get_handle(root->handle, METHOD_NAME__PRT, &handle);
299 if (ACPI_SUCCESS(status))
300 result = acpi_pci_irq_add_prt(root->handle, root->id.segment,
301 root->id.bus);
302
303 end:
304 if (result)
305 kfree(root);
306
307 return_VALUE(result);
308 }
309
310
311 static int
acpi_pci_root_remove(struct acpi_device * device,int type)312 acpi_pci_root_remove (
313 struct acpi_device *device,
314 int type)
315 {
316 struct acpi_pci_root *root = NULL;
317
318 ACPI_FUNCTION_TRACE("acpi_pci_root_remove");
319
320 if (!device || !acpi_driver_data(device))
321 return_VALUE(-EINVAL);
322
323 root = (struct acpi_pci_root *) acpi_driver_data(device);
324
325 kfree(root);
326
327 return_VALUE(0);
328 }
329
330
331 int __init
acpi_pci_root_init(void)332 acpi_pci_root_init (void)
333 {
334 ACPI_FUNCTION_TRACE("acpi_pci_root_init");
335
336 /* DEBUG:
337 acpi_dbg_layer = ACPI_PCI_COMPONENT;
338 acpi_dbg_level = 0xFFFFFFFF;
339 */
340
341 if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
342 return_VALUE(-ENODEV);
343
344 return_VALUE(0);
345 }
346
347
348 void __exit
acpi_pci_root_exit(void)349 acpi_pci_root_exit (void)
350 {
351 ACPI_FUNCTION_TRACE("acpi_pci_root_exit");
352
353 acpi_bus_unregister_driver(&acpi_pci_root_driver);
354
355 return_VOID;
356 }
357