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