ACPI/PCI: call _OSC support during root bridge discovery
[linux-2.6.git] / 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/pci-acpi.h>
35 #include <linux/acpi.h>
36 #include <acpi/acpi_bus.h>
37 #include <acpi/acpi_drivers.h>
38
39 #define _COMPONENT              ACPI_PCI_COMPONENT
40 ACPI_MODULE_NAME("pci_root");
41 #define ACPI_PCI_ROOT_CLASS             "pci_bridge"
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_device_id root_device_ids[] = {
48         {"PNP0A03", 0},
49         {"", 0},
50 };
51 MODULE_DEVICE_TABLE(acpi, root_device_ids);
52
53 static struct acpi_driver acpi_pci_root_driver = {
54         .name = "pci_root",
55         .class = ACPI_PCI_ROOT_CLASS,
56         .ids = root_device_ids,
57         .ops = {
58                 .add = acpi_pci_root_add,
59                 .remove = acpi_pci_root_remove,
60                 .start = acpi_pci_root_start,
61                 },
62 };
63
64 struct acpi_pci_root {
65         struct list_head node;
66         struct acpi_device * device;
67         struct acpi_pci_id id;
68         struct pci_bus *bus;
69 };
70
71 static LIST_HEAD(acpi_pci_roots);
72
73 static struct acpi_pci_driver *sub_driver;
74
75 int acpi_pci_register_driver(struct acpi_pci_driver *driver)
76 {
77         int n = 0;
78         struct list_head *entry;
79
80         struct acpi_pci_driver **pptr = &sub_driver;
81         while (*pptr)
82                 pptr = &(*pptr)->next;
83         *pptr = driver;
84
85         if (!driver->add)
86                 return 0;
87
88         list_for_each(entry, &acpi_pci_roots) {
89                 struct acpi_pci_root *root;
90                 root = list_entry(entry, struct acpi_pci_root, node);
91                 driver->add(root->device->handle);
92                 n++;
93         }
94
95         return n;
96 }
97
98 EXPORT_SYMBOL(acpi_pci_register_driver);
99
100 void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
101 {
102         struct list_head *entry;
103
104         struct acpi_pci_driver **pptr = &sub_driver;
105         while (*pptr) {
106                 if (*pptr == driver)
107                         break;
108                 pptr = &(*pptr)->next;
109         }
110         BUG_ON(!*pptr);
111         *pptr = (*pptr)->next;
112
113         if (!driver->remove)
114                 return;
115
116         list_for_each(entry, &acpi_pci_roots) {
117                 struct acpi_pci_root *root;
118                 root = list_entry(entry, struct acpi_pci_root, node);
119                 driver->remove(root->device->handle);
120         }
121 }
122
123 EXPORT_SYMBOL(acpi_pci_unregister_driver);
124
125 acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
126 {
127         struct acpi_pci_root *tmp;
128         
129         list_for_each_entry(tmp, &acpi_pci_roots, node) {
130                 if ((tmp->id.segment == (u16) seg) && (tmp->id.bus == (u16) bus))
131                         return tmp->device->handle;
132         }
133         return NULL;            
134 }
135
136 EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
137
138 static acpi_status
139 get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
140 {
141         int *busnr = data;
142         struct acpi_resource_address64 address;
143
144         if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
145             resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
146             resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
147                 return AE_OK;
148
149         acpi_resource_to_address64(resource, &address);
150         if ((address.address_length > 0) &&
151             (address.resource_type == ACPI_BUS_NUMBER_RANGE))
152                 *busnr = address.minimum;
153
154         return AE_OK;
155 }
156
157 static acpi_status try_get_root_bridge_busnr(acpi_handle handle, int *busnum)
158 {
159         acpi_status status;
160
161         *busnum = -1;
162         status =
163             acpi_walk_resources(handle, METHOD_NAME__CRS,
164                                 get_root_bridge_busnr_callback, busnum);
165         if (ACPI_FAILURE(status))
166                 return status;
167         /* Check if we really get a bus number from _CRS */
168         if (*busnum == -1)
169                 return AE_ERROR;
170         return AE_OK;
171 }
172
173 static void acpi_pci_bridge_scan(struct acpi_device *device)
174 {
175         int status;
176         struct acpi_device *child = NULL;
177
178         if (device->flags.bus_address)
179                 if (device->parent && device->parent->ops.bind) {
180                         status = device->parent->ops.bind(device);
181                         if (!status) {
182                                 list_for_each_entry(child, &device->children, node)
183                                         acpi_pci_bridge_scan(child);
184                         }
185                 }
186 }
187
188 static int __devinit acpi_pci_root_add(struct acpi_device *device)
189 {
190         int result = 0;
191         struct acpi_pci_root *root = NULL;
192         struct acpi_pci_root *tmp;
193         acpi_status status = AE_OK;
194         unsigned long long value = 0;
195         acpi_handle handle = NULL;
196         struct acpi_device *child;
197         u32 flags;
198
199
200         if (!device)
201                 return -EINVAL;
202
203         root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
204         if (!root)
205                 return -ENOMEM;
206         INIT_LIST_HEAD(&root->node);
207
208         root->device = device;
209         strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
210         strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
211         device->driver_data = root;
212
213         device->ops.bind = acpi_pci_bind;
214
215         /*
216          * All supported architectures that use ACPI have support for
217          * PCI domains, so we indicate this in _OSC support capabilities.
218          */
219         flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
220         pci_acpi_osc_support(device->handle, flags);
221
222         /* 
223          * Segment
224          * -------
225          * Obtained via _SEG, if exists, otherwise assumed to be zero (0).
226          */
227         status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
228                                        &value);
229         switch (status) {
230         case AE_OK:
231                 root->id.segment = (u16) value;
232                 break;
233         case AE_NOT_FOUND:
234                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
235                                   "Assuming segment 0 (no _SEG)\n"));
236                 root->id.segment = 0;
237                 break;
238         default:
239                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SEG"));
240                 result = -ENODEV;
241                 goto end;
242         }
243
244         /* 
245          * Bus
246          * ---
247          * Obtained via _BBN, if exists, otherwise assumed to be zero (0).
248          */
249         status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, NULL,
250                                        &value);
251         switch (status) {
252         case AE_OK:
253                 root->id.bus = (u16) value;
254                 break;
255         case AE_NOT_FOUND:
256                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Assuming bus 0 (no _BBN)\n"));
257                 root->id.bus = 0;
258                 break;
259         default:
260                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BBN"));
261                 result = -ENODEV;
262                 goto end;
263         }
264
265         /* Some systems have wrong _BBN */
266         list_for_each_entry(tmp, &acpi_pci_roots, node) {
267                 if ((tmp->id.segment == root->id.segment)
268                     && (tmp->id.bus == root->id.bus)) {
269                         int bus = 0;
270                         acpi_status status;
271
272                         printk(KERN_ERR PREFIX
273                                     "Wrong _BBN value, reboot"
274                                     " and use option 'pci=noacpi'\n");
275
276                         status = try_get_root_bridge_busnr(device->handle, &bus);
277                         if (ACPI_FAILURE(status))
278                                 break;
279                         if (bus != root->id.bus) {
280                                 printk(KERN_INFO PREFIX
281                                        "PCI _CRS %d overrides _BBN 0\n", bus);
282                                 root->id.bus = bus;
283                         }
284                         break;
285                 }
286         }
287         /*
288          * Device & Function
289          * -----------------
290          * Obtained from _ADR (which has already been evaluated for us).
291          */
292         root->id.device = device->pnp.bus_address >> 16;
293         root->id.function = device->pnp.bus_address & 0xFFFF;
294
295         /*
296          * TBD: Need PCI interface for enumeration/configuration of roots.
297          */
298
299         /* TBD: Locking */
300         list_add_tail(&root->node, &acpi_pci_roots);
301
302         printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n",
303                acpi_device_name(device), acpi_device_bid(device),
304                root->id.segment, root->id.bus);
305
306         /*
307          * Scan the Root Bridge
308          * --------------------
309          * Must do this prior to any attempt to bind the root device, as the
310          * PCI namespace does not get created until this call is made (and 
311          * thus the root bridge's pci_dev does not exist).
312          */
313         root->bus = pci_acpi_scan_root(device, root->id.segment, root->id.bus);
314         if (!root->bus) {
315                 printk(KERN_ERR PREFIX
316                             "Bus %04x:%02x not present in PCI namespace\n",
317                             root->id.segment, root->id.bus);
318                 result = -ENODEV;
319                 goto end;
320         }
321
322         /*
323          * Attach ACPI-PCI Context
324          * -----------------------
325          * Thus binding the ACPI and PCI devices.
326          */
327         result = acpi_pci_bind_root(device, &root->id, root->bus);
328         if (result)
329                 goto end;
330
331         /*
332          * PCI Routing Table
333          * -----------------
334          * Evaluate and parse _PRT, if exists.
335          */
336         status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
337         if (ACPI_SUCCESS(status))
338                 result = acpi_pci_irq_add_prt(device->handle, root->id.segment,
339                                               root->id.bus);
340
341         /*
342          * Scan and bind all _ADR-Based Devices
343          */
344         list_for_each_entry(child, &device->children, node)
345                 acpi_pci_bridge_scan(child);
346
347       end:
348         if (result) {
349                 if (!list_empty(&root->node))
350                         list_del(&root->node);
351                 kfree(root);
352         }
353
354         return result;
355 }
356
357 static int acpi_pci_root_start(struct acpi_device *device)
358 {
359         struct acpi_pci_root *root;
360
361
362         list_for_each_entry(root, &acpi_pci_roots, node) {
363                 if (root->device == device) {
364                         pci_bus_add_devices(root->bus);
365                         return 0;
366                 }
367         }
368         return -ENODEV;
369 }
370
371 static int acpi_pci_root_remove(struct acpi_device *device, int type)
372 {
373         struct acpi_pci_root *root = NULL;
374
375
376         if (!device || !acpi_driver_data(device))
377                 return -EINVAL;
378
379         root = acpi_driver_data(device);
380
381         kfree(root);
382
383         return 0;
384 }
385
386 static int __init acpi_pci_root_init(void)
387 {
388         if (acpi_pci_disabled)
389                 return 0;
390
391         if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
392                 return -ENODEV;
393
394         return 0;
395 }
396
397 subsys_initcall(acpi_pci_root_init);