parisc: sba_iommu: fix build bug when CONFIG_PARISC_AGP=y
[linux-2.6.git] / drivers / acpi / pci_bind.c
1 /*
2  *  pci_bind.c - ACPI PCI Device Binding ($Revision: 2 $)
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_bind");
40
41 struct acpi_pci_data {
42         struct acpi_pci_id id;
43         struct pci_bus *bus;
44         struct pci_dev *dev;
45 };
46
47 static int acpi_pci_unbind(struct acpi_device *device);
48
49 static void acpi_pci_data_handler(acpi_handle handle, u32 function,
50                                   void *context)
51 {
52
53         /* TBD: Anything we need to do here? */
54
55         return;
56 }
57
58 /**
59  * acpi_get_pci_id
60  * ------------------
61  * This function is used by the ACPI Interpreter (a.k.a. Core Subsystem)
62  * to resolve PCI information for ACPI-PCI devices defined in the namespace.
63  * This typically occurs when resolving PCI operation region information.
64  */
65 acpi_status acpi_get_pci_id(acpi_handle handle, struct acpi_pci_id *id)
66 {
67         int result = 0;
68         acpi_status status = AE_OK;
69         struct acpi_device *device = NULL;
70         struct acpi_pci_data *data = NULL;
71
72
73         if (!id)
74                 return AE_BAD_PARAMETER;
75
76         result = acpi_bus_get_device(handle, &device);
77         if (result) {
78                 printk(KERN_ERR PREFIX
79                             "Invalid ACPI Bus context for device %s\n",
80                             acpi_device_bid(device));
81                 return AE_NOT_EXIST;
82         }
83
84         status = acpi_get_data(handle, acpi_pci_data_handler, (void **)&data);
85         if (ACPI_FAILURE(status) || !data) {
86                 ACPI_EXCEPTION((AE_INFO, status,
87                                 "Invalid ACPI-PCI context for device %s",
88                                 acpi_device_bid(device)));
89                 return status;
90         }
91
92         *id = data->id;
93
94         /*
95            id->segment = data->id.segment;
96            id->bus = data->id.bus;
97            id->device = data->id.device;
98            id->function = data->id.function;
99          */
100
101         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
102                           "Device %s has PCI address %04x:%02x:%02x.%d\n",
103                           acpi_device_bid(device), id->segment, id->bus,
104                           id->device, id->function));
105
106         return AE_OK;
107 }
108
109 EXPORT_SYMBOL(acpi_get_pci_id);
110
111 int acpi_pci_bind(struct acpi_device *device)
112 {
113         int result = 0;
114         acpi_status status;
115         struct acpi_pci_data *data;
116         struct acpi_pci_data *pdata;
117         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
118         acpi_handle handle;
119         struct pci_dev *dev;
120         struct pci_bus *bus;
121
122
123         if (!device || !device->parent)
124                 return -EINVAL;
125
126         data = kzalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
127         if (!data)
128                 return -ENOMEM;
129
130         status = acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
131         if (ACPI_FAILURE(status)) {
132                 kfree(data);
133                 return -ENODEV;
134         }
135
136         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI device [%s]...\n",
137                           (char *)buffer.pointer));
138
139         /* 
140          * Segment & Bus
141          * -------------
142          * These are obtained via the parent device's ACPI-PCI context.
143          */
144         status = acpi_get_data(device->parent->handle, acpi_pci_data_handler,
145                                (void **)&pdata);
146         if (ACPI_FAILURE(status) || !pdata || !pdata->bus) {
147                 ACPI_EXCEPTION((AE_INFO, status,
148                                 "Invalid ACPI-PCI context for parent device %s",
149                                 acpi_device_bid(device->parent)));
150                 result = -ENODEV;
151                 goto end;
152         }
153         data->id.segment = pdata->id.segment;
154         data->id.bus = pdata->bus->number;
155
156         /*
157          * Device & Function
158          * -----------------
159          * These are simply obtained from the device's _ADR method.  Note
160          * that a value of zero is valid.
161          */
162         data->id.device = device->pnp.bus_address >> 16;
163         data->id.function = device->pnp.bus_address & 0xFFFF;
164
165         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "...to %04x:%02x:%02x.%d\n",
166                           data->id.segment, data->id.bus, data->id.device,
167                           data->id.function));
168
169         /*
170          * TBD: Support slot devices (e.g. function=0xFFFF).
171          */
172
173         /* 
174          * Locate PCI Device
175          * -----------------
176          * Locate matching device in PCI namespace.  If it doesn't exist
177          * this typically means that the device isn't currently inserted
178          * (e.g. docking station, port replicator, etc.).
179          * We cannot simply search the global pci device list, since
180          * PCI devices are added to the global pci list when the root
181          * bridge start ops are run, which may not have happened yet.
182          */
183         bus = pci_find_bus(data->id.segment, data->id.bus);
184         if (bus) {
185                 list_for_each_entry(dev, &bus->devices, bus_list) {
186                         if (dev->devfn == PCI_DEVFN(data->id.device,
187                                                     data->id.function)) {
188                                 data->dev = dev;
189                                 break;
190                         }
191                 }
192         }
193         if (!data->dev) {
194                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
195                                   "Device %04x:%02x:%02x.%d not present in PCI namespace\n",
196                                   data->id.segment, data->id.bus,
197                                   data->id.device, data->id.function));
198                 result = -ENODEV;
199                 goto end;
200         }
201         if (!data->dev->bus) {
202                 printk(KERN_ERR PREFIX
203                             "Device %04x:%02x:%02x.%d has invalid 'bus' field\n",
204                             data->id.segment, data->id.bus,
205                             data->id.device, data->id.function);
206                 result = -ENODEV;
207                 goto end;
208         }
209
210         /*
211          * PCI Bridge?
212          * -----------
213          * If so, set the 'bus' field and install the 'bind' function to 
214          * facilitate callbacks for all of its children.
215          */
216         if (data->dev->subordinate) {
217                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
218                                   "Device %04x:%02x:%02x.%d is a PCI bridge\n",
219                                   data->id.segment, data->id.bus,
220                                   data->id.device, data->id.function));
221                 data->bus = data->dev->subordinate;
222                 device->ops.bind = acpi_pci_bind;
223                 device->ops.unbind = acpi_pci_unbind;
224         }
225
226         /*
227          * Attach ACPI-PCI Context
228          * -----------------------
229          * Thus binding the ACPI and PCI devices.
230          */
231         status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
232         if (ACPI_FAILURE(status)) {
233                 ACPI_EXCEPTION((AE_INFO, status,
234                                 "Unable to attach ACPI-PCI context to device %s",
235                                 acpi_device_bid(device)));
236                 result = -ENODEV;
237                 goto end;
238         }
239
240         /*
241          * PCI Routing Table
242          * -----------------
243          * Evaluate and parse _PRT, if exists.  This code is independent of 
244          * PCI bridges (above) to allow parsing of _PRT objects within the
245          * scope of non-bridge devices.  Note that _PRTs within the scope of
246          * a PCI bridge assume the bridge's subordinate bus number.
247          *
248          * TBD: Can _PRTs exist within the scope of non-bridge PCI devices?
249          */
250         status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
251         if (ACPI_SUCCESS(status)) {
252                 if (data->bus)  /* PCI-PCI bridge */
253                         acpi_pci_irq_add_prt(device->handle, data->id.segment,
254                                              data->bus->number);
255                 else            /* non-bridge PCI device */
256                         acpi_pci_irq_add_prt(device->handle, data->id.segment,
257                                              data->id.bus);
258         }
259
260       end:
261         kfree(buffer.pointer);
262         if (result)
263                 kfree(data);
264
265         return result;
266 }
267
268 static int acpi_pci_unbind(struct acpi_device *device)
269 {
270         int result = 0;
271         acpi_status status;
272         struct acpi_pci_data *data;
273         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
274
275
276         if (!device || !device->parent)
277                 return -EINVAL;
278
279         status = acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
280         if (ACPI_FAILURE(status))
281                 return -ENODEV;
282
283         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Unbinding PCI device [%s]...\n",
284                           (char *) buffer.pointer));
285         kfree(buffer.pointer);
286
287         status =
288             acpi_get_data(device->handle, acpi_pci_data_handler,
289                           (void **)&data);
290         if (ACPI_FAILURE(status)) {
291                 result = -ENODEV;
292                 goto end;
293         }
294
295         status = acpi_detach_data(device->handle, acpi_pci_data_handler);
296         if (ACPI_FAILURE(status)) {
297                 ACPI_EXCEPTION((AE_INFO, status,
298                                 "Unable to detach data from device %s",
299                                 acpi_device_bid(device)));
300                 result = -ENODEV;
301                 goto end;
302         }
303         if (data->dev->subordinate) {
304                 acpi_pci_irq_del_prt(data->id.segment, data->bus->number);
305         }
306         kfree(data);
307
308       end:
309         return result;
310 }
311
312 int
313 acpi_pci_bind_root(struct acpi_device *device,
314                    struct acpi_pci_id *id, struct pci_bus *bus)
315 {
316         int result = 0;
317         acpi_status status;
318         struct acpi_pci_data *data = NULL;
319         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
320
321         if (!device || !id || !bus) {
322                 return -EINVAL;
323         }
324
325         data = kzalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
326         if (!data)
327                 return -ENOMEM;
328
329         data->id = *id;
330         data->bus = bus;
331         device->ops.bind = acpi_pci_bind;
332         device->ops.unbind = acpi_pci_unbind;
333
334         status = acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
335         if (ACPI_FAILURE(status)) {
336                 kfree (data);
337                 return -ENODEV;
338         }
339
340         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI root bridge [%s] to "
341                         "%04x:%02x\n", (char *)buffer.pointer,
342                         id->segment, id->bus));
343
344         status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
345         if (ACPI_FAILURE(status)) {
346                 ACPI_EXCEPTION((AE_INFO, status,
347                                 "Unable to attach ACPI-PCI context to device %s",
348                                 (char *)buffer.pointer));
349                 result = -ENODEV;
350                 goto end;
351         }
352
353       end:
354         kfree(buffer.pointer);
355         if (result != 0)
356                 kfree(data);
357
358         return result;
359 }