ACPI: fix Supermicro X7DB8+ Boot regression
[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 void acpi_pci_data_handler(acpi_handle handle, u32 function,
48                                   void *context)
49 {
50
51         /* TBD: Anything we need to do here? */
52
53         return;
54 }
55
56 /**
57  * acpi_get_pci_id
58  * ------------------
59  * This function is used by the ACPI Interpreter (a.k.a. Core Subsystem)
60  * to resolve PCI information for ACPI-PCI devices defined in the namespace.
61  * This typically occurs when resolving PCI operation region information.
62  */
63 acpi_status acpi_get_pci_id(acpi_handle handle, struct acpi_pci_id *id)
64 {
65         int result = 0;
66         acpi_status status = AE_OK;
67         struct acpi_device *device = NULL;
68         struct acpi_pci_data *data = NULL;
69
70
71         if (!id)
72                 return AE_BAD_PARAMETER;
73
74         result = acpi_bus_get_device(handle, &device);
75         if (result) {
76                 printk(KERN_ERR PREFIX
77                             "Invalid ACPI Bus context for device %s\n",
78                             acpi_device_bid(device));
79                 return AE_NOT_EXIST;
80         }
81
82         status = acpi_get_data(handle, acpi_pci_data_handler, (void **)&data);
83         if (ACPI_FAILURE(status) || !data) {
84                 ACPI_EXCEPTION((AE_INFO, status,
85                                 "Invalid ACPI-PCI context for device %s",
86                                 acpi_device_bid(device)));
87                 return status;
88         }
89
90         *id = data->id;
91
92         /*
93            id->segment = data->id.segment;
94            id->bus = data->id.bus;
95            id->device = data->id.device;
96            id->function = data->id.function;
97          */
98
99         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
100                           "Device %s has PCI address %02x:%02x:%02x.%02x\n",
101                           acpi_device_bid(device), id->segment, id->bus,
102                           id->device, id->function));
103
104         return AE_OK;
105 }
106
107 EXPORT_SYMBOL(acpi_get_pci_id);
108
109 int acpi_pci_bind(struct acpi_device *device)
110 {
111         int result = 0;
112         acpi_status status = AE_OK;
113         struct acpi_pci_data *data = NULL;
114         struct acpi_pci_data *pdata = NULL;
115         char *pathname = NULL;
116         struct acpi_buffer buffer = { 0, NULL };
117         acpi_handle handle = NULL;
118         struct pci_dev *dev;
119         struct pci_bus *bus;
120
121
122         if (!device || !device->parent)
123                 return -EINVAL;
124
125         pathname = kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
126         if (!pathname)
127                 return -ENOMEM;
128         memset(pathname, 0, ACPI_PATHNAME_MAX);
129         buffer.length = ACPI_PATHNAME_MAX;
130         buffer.pointer = pathname;
131
132         data = kmalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
133         if (!data) {
134                 kfree(pathname);
135                 return -ENOMEM;
136         }
137         memset(data, 0, sizeof(struct acpi_pci_data));
138
139         acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
140         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI device [%s]...\n",
141                           pathname));
142
143         /* 
144          * Segment & Bus
145          * -------------
146          * These are obtained via the parent device's ACPI-PCI context.
147          */
148         status = acpi_get_data(device->parent->handle, acpi_pci_data_handler,
149                                (void **)&pdata);
150         if (ACPI_FAILURE(status) || !pdata || !pdata->bus) {
151                 ACPI_EXCEPTION((AE_INFO, status,
152                                 "Invalid ACPI-PCI context for parent device %s",
153                                 acpi_device_bid(device->parent)));
154                 result = -ENODEV;
155                 goto end;
156         }
157         data->id.segment = pdata->id.segment;
158         data->id.bus = pdata->bus->number;
159
160         /*
161          * Device & Function
162          * -----------------
163          * These are simply obtained from the device's _ADR method.  Note
164          * that a value of zero is valid.
165          */
166         data->id.device = device->pnp.bus_address >> 16;
167         data->id.function = device->pnp.bus_address & 0xFFFF;
168
169         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "...to %02x:%02x:%02x.%02x\n",
170                           data->id.segment, data->id.bus, data->id.device,
171                           data->id.function));
172
173         /*
174          * TBD: Support slot devices (e.g. function=0xFFFF).
175          */
176
177         /* 
178          * Locate PCI Device
179          * -----------------
180          * Locate matching device in PCI namespace.  If it doesn't exist
181          * this typically means that the device isn't currently inserted
182          * (e.g. docking station, port replicator, etc.).
183          * We cannot simply search the global pci device list, since
184          * PCI devices are added to the global pci list when the root
185          * bridge start ops are run, which may not have happened yet.
186          */
187         bus = pci_find_bus(data->id.segment, data->id.bus);
188         if (bus) {
189                 list_for_each_entry(dev, &bus->devices, bus_list) {
190                         if (dev->devfn == PCI_DEVFN(data->id.device,
191                                                     data->id.function)) {
192                                 data->dev = dev;
193                                 break;
194                         }
195                 }
196         }
197         if (!data->dev) {
198                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
199                                   "Device %02x:%02x:%02x.%02x not present in PCI namespace\n",
200                                   data->id.segment, data->id.bus,
201                                   data->id.device, data->id.function));
202                 result = -ENODEV;
203                 goto end;
204         }
205         if (!data->dev->bus) {
206                 printk(KERN_ERR PREFIX
207                             "Device %02x:%02x:%02x.%02x has invalid 'bus' field\n",
208                             data->id.segment, data->id.bus,
209                             data->id.device, data->id.function);
210                 result = -ENODEV;
211                 goto end;
212         }
213
214         /*
215          * PCI Bridge?
216          * -----------
217          * If so, set the 'bus' field and install the 'bind' function to 
218          * facilitate callbacks for all of its children.
219          */
220         if (data->dev->subordinate) {
221                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
222                                   "Device %02x:%02x:%02x.%02x is a PCI bridge\n",
223                                   data->id.segment, data->id.bus,
224                                   data->id.device, data->id.function));
225                 data->bus = data->dev->subordinate;
226                 device->ops.bind = acpi_pci_bind;
227                 device->ops.unbind = acpi_pci_unbind;
228         }
229
230         /*
231          * Attach ACPI-PCI Context
232          * -----------------------
233          * Thus binding the ACPI and PCI devices.
234          */
235         status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
236         if (ACPI_FAILURE(status)) {
237                 ACPI_EXCEPTION((AE_INFO, status,
238                                 "Unable to attach ACPI-PCI context to device %s",
239                                 acpi_device_bid(device)));
240                 result = -ENODEV;
241                 goto end;
242         }
243
244         /*
245          * PCI Routing Table
246          * -----------------
247          * Evaluate and parse _PRT, if exists.  This code is independent of 
248          * PCI bridges (above) to allow parsing of _PRT objects within the
249          * scope of non-bridge devices.  Note that _PRTs within the scope of
250          * a PCI bridge assume the bridge's subordinate bus number.
251          *
252          * TBD: Can _PRTs exist within the scope of non-bridge PCI devices?
253          */
254         status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
255         if (ACPI_SUCCESS(status)) {
256                 if (data->bus)  /* PCI-PCI bridge */
257                         acpi_pci_irq_add_prt(device->handle, data->id.segment,
258                                              data->bus->number);
259                 else            /* non-bridge PCI device */
260                         acpi_pci_irq_add_prt(device->handle, data->id.segment,
261                                              data->id.bus);
262         }
263
264       end:
265         kfree(pathname);
266         if (result)
267                 kfree(data);
268
269         return result;
270 }
271
272 int acpi_pci_unbind(struct acpi_device *device)
273 {
274         int result = 0;
275         acpi_status status = AE_OK;
276         struct acpi_pci_data *data = NULL;
277         char *pathname = NULL;
278         struct acpi_buffer buffer = { 0, NULL };
279
280
281         if (!device || !device->parent)
282                 return -EINVAL;
283
284         pathname = (char *)kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
285         if (!pathname)
286                 return -ENOMEM;
287         memset(pathname, 0, ACPI_PATHNAME_MAX);
288
289         buffer.length = ACPI_PATHNAME_MAX;
290         buffer.pointer = pathname;
291         acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
292         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Unbinding PCI device [%s]...\n",
293                           pathname));
294         kfree(pathname);
295
296         status =
297             acpi_get_data(device->handle, acpi_pci_data_handler,
298                           (void **)&data);
299         if (ACPI_FAILURE(status)) {
300                 ACPI_EXCEPTION((AE_INFO, status,
301                                 "Unable to get data from device %s",
302                                 acpi_device_bid(device)));
303                 result = -ENODEV;
304                 goto end;
305         }
306
307         status = acpi_detach_data(device->handle, acpi_pci_data_handler);
308         if (ACPI_FAILURE(status)) {
309                 ACPI_EXCEPTION((AE_INFO, status,
310                                 "Unable to detach data from device %s",
311                                 acpi_device_bid(device)));
312                 result = -ENODEV;
313                 goto end;
314         }
315         if (data->dev->subordinate) {
316                 acpi_pci_irq_del_prt(data->id.segment, data->bus->number);
317         }
318         kfree(data);
319
320       end:
321         return result;
322 }
323
324 int
325 acpi_pci_bind_root(struct acpi_device *device,
326                    struct acpi_pci_id *id, struct pci_bus *bus)
327 {
328         int result = 0;
329         acpi_status status = AE_OK;
330         struct acpi_pci_data *data = NULL;
331         char *pathname = NULL;
332         struct acpi_buffer buffer = { 0, NULL };
333
334
335         pathname = (char *)kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
336         if (!pathname)
337                 return -ENOMEM;
338         memset(pathname, 0, ACPI_PATHNAME_MAX);
339
340         buffer.length = ACPI_PATHNAME_MAX;
341         buffer.pointer = pathname;
342
343         if (!device || !id || !bus) {
344                 kfree(pathname);
345                 return -EINVAL;
346         }
347
348         data = kmalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
349         if (!data) {
350                 kfree(pathname);
351                 return -ENOMEM;
352         }
353         memset(data, 0, sizeof(struct acpi_pci_data));
354
355         data->id = *id;
356         data->bus = bus;
357         device->ops.bind = acpi_pci_bind;
358         device->ops.unbind = acpi_pci_unbind;
359
360         acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
361
362         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI root bridge [%s] to "
363                           "%02x:%02x\n", pathname, id->segment, id->bus));
364
365         status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
366         if (ACPI_FAILURE(status)) {
367                 ACPI_EXCEPTION((AE_INFO, status,
368                                 "Unable to attach ACPI-PCI context to device %s",
369                                 pathname));
370                 result = -ENODEV;
371                 goto end;
372         }
373
374       end:
375         kfree(pathname);
376         if (result != 0)
377                 kfree(data);
378
379         return result;
380 }