ACPI: catch calls of acpi_driver_data on pointer of wrong type
[linux-3.10.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/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_DEVICE_NAME       "PCI Root Bridge"
42 static int acpi_pci_root_add(struct acpi_device *device);
43 static int acpi_pci_root_remove(struct acpi_device *device, int type);
44 static int acpi_pci_root_start(struct acpi_device *device);
45
46 static struct acpi_device_id root_device_ids[] = {
47         {"PNP0A03", 0},
48         {"", 0},
49 };
50 MODULE_DEVICE_TABLE(acpi, root_device_ids);
51
52 static struct acpi_driver acpi_pci_root_driver = {
53         .name = "pci_root",
54         .class = ACPI_PCI_ROOT_CLASS,
55         .ids = root_device_ids,
56         .ops = {
57                 .add = acpi_pci_root_add,
58                 .remove = acpi_pci_root_remove,
59                 .start = acpi_pci_root_start,
60                 },
61 };
62
63 struct acpi_pci_root {
64         struct list_head node;
65         struct acpi_device * device;
66         struct acpi_pci_id id;
67         struct pci_bus *bus;
68 };
69
70 static LIST_HEAD(acpi_pci_roots);
71
72 static struct acpi_pci_driver *sub_driver;
73
74 int acpi_pci_register_driver(struct acpi_pci_driver *driver)
75 {
76         int n = 0;
77         struct list_head *entry;
78
79         struct acpi_pci_driver **pptr = &sub_driver;
80         while (*pptr)
81                 pptr = &(*pptr)->next;
82         *pptr = driver;
83
84         if (!driver->add)
85                 return 0;
86
87         list_for_each(entry, &acpi_pci_roots) {
88                 struct acpi_pci_root *root;
89                 root = list_entry(entry, struct acpi_pci_root, node);
90                 driver->add(root->device->handle);
91                 n++;
92         }
93
94         return n;
95 }
96
97 EXPORT_SYMBOL(acpi_pci_register_driver);
98
99 void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
100 {
101         struct list_head *entry;
102
103         struct acpi_pci_driver **pptr = &sub_driver;
104         while (*pptr) {
105                 if (*pptr == driver)
106                         break;
107                 pptr = &(*pptr)->next;
108         }
109         BUG_ON(!*pptr);
110         *pptr = (*pptr)->next;
111
112         if (!driver->remove)
113                 return;
114
115         list_for_each(entry, &acpi_pci_roots) {
116                 struct acpi_pci_root *root;
117                 root = list_entry(entry, struct acpi_pci_root, node);
118                 driver->remove(root->device->handle);
119         }
120 }
121
122 EXPORT_SYMBOL(acpi_pci_unregister_driver);
123
124 acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
125 {
126         struct acpi_pci_root *tmp;
127         
128         list_for_each_entry(tmp, &acpi_pci_roots, node) {
129                 if ((tmp->id.segment == (u16) seg) && (tmp->id.bus == (u16) bus))
130                         return tmp->device->handle;
131         }
132         return NULL;            
133 }
134
135 EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
136
137 static acpi_status
138 get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
139 {
140         int *busnr = data;
141         struct acpi_resource_address64 address;
142
143         if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
144             resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
145             resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
146                 return AE_OK;
147
148         acpi_resource_to_address64(resource, &address);
149         if ((address.address_length > 0) &&
150             (address.resource_type == ACPI_BUS_NUMBER_RANGE))
151                 *busnr = address.minimum;
152
153         return AE_OK;
154 }
155
156 static acpi_status try_get_root_bridge_busnr(acpi_handle handle, int *busnum)
157 {
158         acpi_status status;
159
160         *busnum = -1;
161         status =
162             acpi_walk_resources(handle, METHOD_NAME__CRS,
163                                 get_root_bridge_busnr_callback, busnum);
164         if (ACPI_FAILURE(status))
165                 return status;
166         /* Check if we really get a bus number from _CRS */
167         if (*busnum == -1)
168                 return AE_ERROR;
169         return AE_OK;
170 }
171
172 static void acpi_pci_bridge_scan(struct acpi_device *device)
173 {
174         int status;
175         struct acpi_device *child = NULL;
176
177         if (device->flags.bus_address)
178                 if (device->parent && device->parent->ops.bind) {
179                         status = device->parent->ops.bind(device);
180                         if (!status) {
181                                 list_for_each_entry(child, &device->children, node)
182                                         acpi_pci_bridge_scan(child);
183                         }
184                 }
185 }
186
187 static int __devinit acpi_pci_root_add(struct acpi_device *device)
188 {
189         int result = 0;
190         struct acpi_pci_root *root = NULL;
191         struct acpi_pci_root *tmp;
192         acpi_status status = AE_OK;
193         unsigned long value = 0;
194         acpi_handle handle = NULL;
195         struct acpi_device *child;
196
197
198         if (!device)
199                 return -EINVAL;
200
201         root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
202         if (!root)
203                 return -ENOMEM;
204         INIT_LIST_HEAD(&root->node);
205
206         root->device = device;
207         strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
208         strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
209         device->driver_data = root;
210
211         device->ops.bind = acpi_pci_bind;
212
213         /* 
214          * Segment
215          * -------
216          * Obtained via _SEG, if exists, otherwise assumed to be zero (0).
217          */
218         status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
219                                        &value);
220         switch (status) {
221         case AE_OK:
222                 root->id.segment = (u16) value;
223                 break;
224         case AE_NOT_FOUND:
225                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
226                                   "Assuming segment 0 (no _SEG)\n"));
227                 root->id.segment = 0;
228                 break;
229         default:
230                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SEG"));
231                 result = -ENODEV;
232                 goto end;
233         }
234
235         /* 
236          * Bus
237          * ---
238          * Obtained via _BBN, if exists, otherwise assumed to be zero (0).
239          */
240         status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, NULL,
241                                        &value);
242         switch (status) {
243         case AE_OK:
244                 root->id.bus = (u16) value;
245                 break;
246         case AE_NOT_FOUND:
247                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Assuming bus 0 (no _BBN)\n"));
248                 root->id.bus = 0;
249                 break;
250         default:
251                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BBN"));
252                 result = -ENODEV;
253                 goto end;
254         }
255
256         /* Some systems have wrong _BBN */
257         list_for_each_entry(tmp, &acpi_pci_roots, node) {
258                 if ((tmp->id.segment == root->id.segment)
259                     && (tmp->id.bus == root->id.bus)) {
260                         int bus = 0;
261                         acpi_status status;
262
263                         printk(KERN_ERR PREFIX
264                                     "Wrong _BBN value, reboot"
265                                     " and use option 'pci=noacpi'\n");
266
267                         status = try_get_root_bridge_busnr(device->handle, &bus);
268                         if (ACPI_FAILURE(status))
269                                 break;
270                         if (bus != root->id.bus) {
271                                 printk(KERN_INFO PREFIX
272                                        "PCI _CRS %d overrides _BBN 0\n", bus);
273                                 root->id.bus = bus;
274                         }
275                         break;
276                 }
277         }
278         /*
279          * Device & Function
280          * -----------------
281          * Obtained from _ADR (which has already been evaluated for us).
282          */
283         root->id.device = device->pnp.bus_address >> 16;
284         root->id.function = device->pnp.bus_address & 0xFFFF;
285
286         /*
287          * TBD: Need PCI interface for enumeration/configuration of roots.
288          */
289
290         /* TBD: Locking */
291         list_add_tail(&root->node, &acpi_pci_roots);
292
293         printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n",
294                acpi_device_name(device), acpi_device_bid(device),
295                root->id.segment, root->id.bus);
296
297         /*
298          * Scan the Root Bridge
299          * --------------------
300          * Must do this prior to any attempt to bind the root device, as the
301          * PCI namespace does not get created until this call is made (and 
302          * thus the root bridge's pci_dev does not exist).
303          */
304         root->bus = pci_acpi_scan_root(device, root->id.segment, root->id.bus);
305         if (!root->bus) {
306                 printk(KERN_ERR PREFIX
307                             "Bus %04x:%02x not present in PCI namespace\n",
308                             root->id.segment, root->id.bus);
309                 result = -ENODEV;
310                 goto end;
311         }
312
313         /*
314          * Attach ACPI-PCI Context
315          * -----------------------
316          * Thus binding the ACPI and PCI devices.
317          */
318         result = acpi_pci_bind_root(device, &root->id, root->bus);
319         if (result)
320                 goto end;
321
322         /*
323          * PCI Routing Table
324          * -----------------
325          * Evaluate and parse _PRT, if exists.
326          */
327         status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
328         if (ACPI_SUCCESS(status))
329                 result = acpi_pci_irq_add_prt(device->handle, root->id.segment,
330                                               root->id.bus);
331
332         /*
333          * Scan and bind all _ADR-Based Devices
334          */
335         list_for_each_entry(child, &device->children, node)
336                 acpi_pci_bridge_scan(child);
337
338       end:
339         if (result) {
340                 if (!list_empty(&root->node))
341                         list_del(&root->node);
342                 kfree(root);
343         }
344
345         return result;
346 }
347
348 static int acpi_pci_root_start(struct acpi_device *device)
349 {
350         struct acpi_pci_root *root;
351
352
353         list_for_each_entry(root, &acpi_pci_roots, node) {
354                 if (root->device == device) {
355                         pci_bus_add_devices(root->bus);
356                         return 0;
357                 }
358         }
359         return -ENODEV;
360 }
361
362 static int acpi_pci_root_remove(struct acpi_device *device, int type)
363 {
364         struct acpi_pci_root *root = NULL;
365
366
367         if (!device || !acpi_driver_data(device))
368                 return -EINVAL;
369
370         root = acpi_driver_data(device);
371
372         kfree(root);
373
374         return 0;
375 }
376
377 static int __init acpi_pci_root_init(void)
378 {
379
380         if (acpi_pci_disabled)
381                 return 0;
382
383         /* DEBUG:
384            acpi_dbg_layer = ACPI_PCI_COMPONENT;
385            acpi_dbg_level = 0xFFFFFFFF;
386          */
387
388         if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
389                 return -ENODEV;
390
391         return 0;
392 }
393
394 subsys_initcall(acpi_pci_root_init);