Pull bugzilla-7897 into release branch
[linux-2.6] / drivers / acpi / pci_root.c
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 #define _COMPONENT              ACPI_PCI_COMPONENT
39 ACPI_MODULE_NAME("pci_root");
40 #define ACPI_PCI_ROOT_CLASS             "pci_bridge"
41 #define ACPI_PCI_ROOT_HID               "PNP0A03"
42 #define ACPI_PCI_ROOT_DEVICE_NAME       "PCI Root Bridge"
43 static int acpi_pci_root_add(struct acpi_device *device);
44 static int acpi_pci_root_remove(struct acpi_device *device, int type);
45 static int acpi_pci_root_start(struct acpi_device *device);
46
47 static struct acpi_driver acpi_pci_root_driver = {
48         .name = "pci_root",
49         .class = ACPI_PCI_ROOT_CLASS,
50         .ids = ACPI_PCI_ROOT_HID,
51         .ops = {
52                 .add = acpi_pci_root_add,
53                 .remove = acpi_pci_root_remove,
54                 .start = acpi_pci_root_start,
55                 },
56 };
57
58 struct acpi_pci_root {
59         struct list_head node;
60         struct acpi_device * device;
61         struct acpi_pci_id id;
62         struct pci_bus *bus;
63 };
64
65 static LIST_HEAD(acpi_pci_roots);
66
67 static struct acpi_pci_driver *sub_driver;
68
69 int acpi_pci_register_driver(struct acpi_pci_driver *driver)
70 {
71         int n = 0;
72         struct list_head *entry;
73
74         struct acpi_pci_driver **pptr = &sub_driver;
75         while (*pptr)
76                 pptr = &(*pptr)->next;
77         *pptr = driver;
78
79         if (!driver->add)
80                 return 0;
81
82         list_for_each(entry, &acpi_pci_roots) {
83                 struct acpi_pci_root *root;
84                 root = list_entry(entry, struct acpi_pci_root, node);
85                 driver->add(root->device->handle);
86                 n++;
87         }
88
89         return n;
90 }
91
92 EXPORT_SYMBOL(acpi_pci_register_driver);
93
94 void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
95 {
96         struct list_head *entry;
97
98         struct acpi_pci_driver **pptr = &sub_driver;
99         while (*pptr) {
100                 if (*pptr == driver)
101                         break;
102                 pptr = &(*pptr)->next;
103         }
104         BUG_ON(!*pptr);
105         *pptr = (*pptr)->next;
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->device->handle);
114         }
115 }
116
117 EXPORT_SYMBOL(acpi_pci_unregister_driver);
118
119 acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
120 {
121         struct acpi_pci_root *tmp;
122         
123         list_for_each_entry(tmp, &acpi_pci_roots, node) {
124                 if ((tmp->id.segment == (u16) seg) && (tmp->id.bus == (u16) bus))
125                         return tmp->device->handle;
126         }
127         return NULL;            
128 }
129
130 EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
131
132 static acpi_status
133 get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
134 {
135         int *busnr = data;
136         struct acpi_resource_address64 address;
137
138         if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
139             resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
140             resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
141                 return AE_OK;
142
143         acpi_resource_to_address64(resource, &address);
144         if ((address.address_length > 0) &&
145             (address.resource_type == ACPI_BUS_NUMBER_RANGE))
146                 *busnr = address.minimum;
147
148         return AE_OK;
149 }
150
151 static acpi_status try_get_root_bridge_busnr(acpi_handle handle, int *busnum)
152 {
153         acpi_status status;
154
155         *busnum = -1;
156         status =
157             acpi_walk_resources(handle, METHOD_NAME__CRS,
158                                 get_root_bridge_busnr_callback, busnum);
159         if (ACPI_FAILURE(status))
160                 return status;
161         /* Check if we really get a bus number from _CRS */
162         if (*busnum == -1)
163                 return AE_ERROR;
164         return AE_OK;
165 }
166
167 static void acpi_pci_bridge_scan(struct acpi_device *device)
168 {
169         int status;
170         struct acpi_device *child = NULL;
171
172         if (device->flags.bus_address)
173                 if (device->parent && device->parent->ops.bind) {
174                         status = device->parent->ops.bind(device);
175                         if (!status) {
176                                 list_for_each_entry(child, &device->children, node)
177                                         acpi_pci_bridge_scan(child);
178                         }
179                 }
180 }
181
182 static int acpi_pci_root_add(struct acpi_device *device)
183 {
184         int result = 0;
185         struct acpi_pci_root *root = NULL;
186         struct acpi_pci_root *tmp;
187         acpi_status status = AE_OK;
188         unsigned long value = 0;
189         acpi_handle handle = NULL;
190         struct acpi_device *child;
191
192
193         if (!device)
194                 return -EINVAL;
195
196         root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
197         if (!root)
198                 return -ENOMEM;
199         INIT_LIST_HEAD(&root->node);
200
201         root->device = device;
202         strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
203         strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
204         acpi_driver_data(device) = root;
205
206         device->ops.bind = acpi_pci_bind;
207
208         /* 
209          * Segment
210          * -------
211          * Obtained via _SEG, if exists, otherwise assumed to be zero (0).
212          */
213         status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
214                                        &value);
215         switch (status) {
216         case AE_OK:
217                 root->id.segment = (u16) value;
218                 break;
219         case AE_NOT_FOUND:
220                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
221                                   "Assuming segment 0 (no _SEG)\n"));
222                 root->id.segment = 0;
223                 break;
224         default:
225                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SEG"));
226                 result = -ENODEV;
227                 goto end;
228         }
229
230         /* 
231          * Bus
232          * ---
233          * Obtained via _BBN, if exists, otherwise assumed to be zero (0).
234          */
235         status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, NULL,
236                                        &value);
237         switch (status) {
238         case AE_OK:
239                 root->id.bus = (u16) value;
240                 break;
241         case AE_NOT_FOUND:
242                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Assuming bus 0 (no _BBN)\n"));
243                 root->id.bus = 0;
244                 break;
245         default:
246                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BBN"));
247                 result = -ENODEV;
248                 goto end;
249         }
250
251         /* Some systems have wrong _BBN */
252         list_for_each_entry(tmp, &acpi_pci_roots, node) {
253                 if ((tmp->id.segment == root->id.segment)
254                     && (tmp->id.bus == root->id.bus)) {
255                         int bus = 0;
256                         acpi_status status;
257
258                         printk(KERN_ERR PREFIX
259                                     "Wrong _BBN value, reboot"
260                                     " and use option 'pci=noacpi'\n");
261
262                         status = try_get_root_bridge_busnr(device->handle, &bus);
263                         if (ACPI_FAILURE(status))
264                                 break;
265                         if (bus != root->id.bus) {
266                                 printk(KERN_INFO PREFIX
267                                        "PCI _CRS %d overrides _BBN 0\n", bus);
268                                 root->id.bus = bus;
269                         }
270                         break;
271                 }
272         }
273         /*
274          * Device & Function
275          * -----------------
276          * Obtained from _ADR (which has already been evaluated for us).
277          */
278         root->id.device = device->pnp.bus_address >> 16;
279         root->id.function = device->pnp.bus_address & 0xFFFF;
280
281         /*
282          * TBD: Need PCI interface for enumeration/configuration of roots.
283          */
284
285         /* TBD: Locking */
286         list_add_tail(&root->node, &acpi_pci_roots);
287
288         printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n",
289                acpi_device_name(device), acpi_device_bid(device),
290                root->id.segment, root->id.bus);
291
292         /*
293          * Scan the Root Bridge
294          * --------------------
295          * Must do this prior to any attempt to bind the root device, as the
296          * PCI namespace does not get created until this call is made (and 
297          * thus the root bridge's pci_dev does not exist).
298          */
299         root->bus = pci_acpi_scan_root(device, root->id.segment, root->id.bus);
300         if (!root->bus) {
301                 printk(KERN_ERR PREFIX
302                             "Bus %04x:%02x not present in PCI namespace\n",
303                             root->id.segment, root->id.bus);
304                 result = -ENODEV;
305                 goto end;
306         }
307
308         /*
309          * Attach ACPI-PCI Context
310          * -----------------------
311          * Thus binding the ACPI and PCI devices.
312          */
313         result = acpi_pci_bind_root(device, &root->id, root->bus);
314         if (result)
315                 goto end;
316
317         /*
318          * PCI Routing Table
319          * -----------------
320          * Evaluate and parse _PRT, if exists.
321          */
322         status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
323         if (ACPI_SUCCESS(status))
324                 result = acpi_pci_irq_add_prt(device->handle, root->id.segment,
325                                               root->id.bus);
326
327         /*
328          * Scan and bind all _ADR-Based Devices
329          */
330         list_for_each_entry(child, &device->children, node)
331                 acpi_pci_bridge_scan(child);
332
333       end:
334         if (result) {
335                 if (!list_empty(&root->node))
336                         list_del(&root->node);
337                 kfree(root);
338         }
339
340         return result;
341 }
342
343 static int acpi_pci_root_start(struct acpi_device *device)
344 {
345         struct acpi_pci_root *root;
346
347
348         list_for_each_entry(root, &acpi_pci_roots, node) {
349                 if (root->device == device) {
350                         pci_bus_add_devices(root->bus);
351                         return 0;
352                 }
353         }
354         return -ENODEV;
355 }
356
357 static int acpi_pci_root_remove(struct acpi_device *device, int type)
358 {
359         struct acpi_pci_root *root = NULL;
360
361
362         if (!device || !acpi_driver_data(device))
363                 return -EINVAL;
364
365         root = acpi_driver_data(device);
366
367         kfree(root);
368
369         return 0;
370 }
371
372 static int __init acpi_pci_root_init(void)
373 {
374
375         if (acpi_pci_disabled)
376                 return 0;
377
378         /* DEBUG:
379            acpi_dbg_layer = ACPI_PCI_COMPONENT;
380            acpi_dbg_level = 0xFFFFFFFF;
381          */
382
383         if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
384                 return -ENODEV;
385
386         return 0;
387 }
388
389 subsys_initcall(acpi_pci_root_init);