ACPI: pci_root: remove unused dev/fn information
[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 pci_bus *bus;
68         u16 segment;
69         u8 bus_nr;
70
71         u32 osc_support_set;    /* _OSC state of support bits */
72         u32 osc_control_set;    /* _OSC state of control bits */
73         u32 osc_control_qry;    /* the latest _OSC query result */
74
75         u32 osc_queried:1;      /* has _OSC control been queried? */
76 };
77
78 static LIST_HEAD(acpi_pci_roots);
79
80 static struct acpi_pci_driver *sub_driver;
81 static DEFINE_MUTEX(osc_lock);
82
83 int acpi_pci_register_driver(struct acpi_pci_driver *driver)
84 {
85         int n = 0;
86         struct acpi_pci_root *root;
87
88         struct acpi_pci_driver **pptr = &sub_driver;
89         while (*pptr)
90                 pptr = &(*pptr)->next;
91         *pptr = driver;
92
93         if (!driver->add)
94                 return 0;
95
96         list_for_each_entry(root, &acpi_pci_roots, node) {
97                 driver->add(root->device->handle);
98                 n++;
99         }
100
101         return n;
102 }
103
104 EXPORT_SYMBOL(acpi_pci_register_driver);
105
106 void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
107 {
108         struct acpi_pci_root *root;
109
110         struct acpi_pci_driver **pptr = &sub_driver;
111         while (*pptr) {
112                 if (*pptr == driver)
113                         break;
114                 pptr = &(*pptr)->next;
115         }
116         BUG_ON(!*pptr);
117         *pptr = (*pptr)->next;
118
119         if (!driver->remove)
120                 return;
121
122         list_for_each_entry(root, &acpi_pci_roots, node)
123                 driver->remove(root->device->handle);
124 }
125
126 EXPORT_SYMBOL(acpi_pci_unregister_driver);
127
128 acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
129 {
130         struct acpi_pci_root *root;
131         
132         list_for_each_entry(root, &acpi_pci_roots, node)
133                 if ((root->segment == (u16) seg) && (root->bus_nr == (u16) bus))
134                         return root->device->handle;
135         return NULL;            
136 }
137
138 EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
139
140 static acpi_status
141 get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
142 {
143         int *busnr = data;
144         struct acpi_resource_address64 address;
145
146         if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
147             resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
148             resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
149                 return AE_OK;
150
151         acpi_resource_to_address64(resource, &address);
152         if ((address.address_length > 0) &&
153             (address.resource_type == ACPI_BUS_NUMBER_RANGE))
154                 *busnr = address.minimum;
155
156         return AE_OK;
157 }
158
159 static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
160                                              unsigned long long *bus)
161 {
162         acpi_status status;
163         int busnum;
164
165         busnum = -1;
166         status =
167             acpi_walk_resources(handle, METHOD_NAME__CRS,
168                                 get_root_bridge_busnr_callback, &busnum);
169         if (ACPI_FAILURE(status))
170                 return status;
171         /* Check if we really get a bus number from _CRS */
172         if (busnum == -1)
173                 return AE_ERROR;
174         *bus = busnum;
175         return AE_OK;
176 }
177
178 static void acpi_pci_bridge_scan(struct acpi_device *device)
179 {
180         int status;
181         struct acpi_device *child = NULL;
182
183         if (device->flags.bus_address)
184                 if (device->parent && device->parent->ops.bind) {
185                         status = device->parent->ops.bind(device);
186                         if (!status) {
187                                 list_for_each_entry(child, &device->children, node)
188                                         acpi_pci_bridge_scan(child);
189                         }
190                 }
191 }
192
193 static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40,
194                           0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
195
196 static acpi_status acpi_pci_run_osc(acpi_handle handle,
197                                     const u32 *capbuf, u32 *retval)
198 {
199         acpi_status status;
200         struct acpi_object_list input;
201         union acpi_object in_params[4];
202         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
203         union acpi_object *out_obj;
204         u32 errors;
205
206         /* Setting up input parameters */
207         input.count = 4;
208         input.pointer = in_params;
209         in_params[0].type               = ACPI_TYPE_BUFFER;
210         in_params[0].buffer.length      = 16;
211         in_params[0].buffer.pointer     = OSC_UUID;
212         in_params[1].type               = ACPI_TYPE_INTEGER;
213         in_params[1].integer.value      = 1;
214         in_params[2].type               = ACPI_TYPE_INTEGER;
215         in_params[2].integer.value      = 3;
216         in_params[3].type               = ACPI_TYPE_BUFFER;
217         in_params[3].buffer.length      = 12;
218         in_params[3].buffer.pointer     = (u8 *)capbuf;
219
220         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
221         if (ACPI_FAILURE(status))
222                 return status;
223
224         if (!output.length)
225                 return AE_NULL_OBJECT;
226
227         out_obj = output.pointer;
228         if (out_obj->type != ACPI_TYPE_BUFFER) {
229                 printk(KERN_DEBUG "_OSC evaluation returned wrong type\n");
230                 status = AE_TYPE;
231                 goto out_kfree;
232         }
233         /* Need to ignore the bit0 in result code */
234         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
235         if (errors) {
236                 if (errors & OSC_REQUEST_ERROR)
237                         printk(KERN_DEBUG "_OSC request failed\n");
238                 if (errors & OSC_INVALID_UUID_ERROR)
239                         printk(KERN_DEBUG "_OSC invalid UUID\n");
240                 if (errors & OSC_INVALID_REVISION_ERROR)
241                         printk(KERN_DEBUG "_OSC invalid revision\n");
242                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
243                         if (capbuf[OSC_QUERY_TYPE] & OSC_QUERY_ENABLE)
244                                 goto out_success;
245                         printk(KERN_DEBUG
246                                "Firmware did not grant requested _OSC control\n");
247                         status = AE_SUPPORT;
248                         goto out_kfree;
249                 }
250                 status = AE_ERROR;
251                 goto out_kfree;
252         }
253 out_success:
254         *retval = *((u32 *)(out_obj->buffer.pointer + 8));
255         status = AE_OK;
256
257 out_kfree:
258         kfree(output.pointer);
259         return status;
260 }
261
262 static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, u32 flags)
263 {
264         acpi_status status;
265         u32 support_set, result, capbuf[3];
266
267         /* do _OSC query for all possible controls */
268         support_set = root->osc_support_set | (flags & OSC_SUPPORT_MASKS);
269         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
270         capbuf[OSC_SUPPORT_TYPE] = support_set;
271         capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
272
273         status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
274         if (ACPI_SUCCESS(status)) {
275                 root->osc_support_set = support_set;
276                 root->osc_control_qry = result;
277                 root->osc_queried = 1;
278         }
279         return status;
280 }
281
282 static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
283 {
284         acpi_status status;
285         acpi_handle tmp;
286
287         status = acpi_get_handle(root->device->handle, "_OSC", &tmp);
288         if (ACPI_FAILURE(status))
289                 return status;
290         mutex_lock(&osc_lock);
291         status = acpi_pci_query_osc(root, flags);
292         mutex_unlock(&osc_lock);
293         return status;
294 }
295
296 static struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
297 {
298         struct acpi_pci_root *root;
299
300         list_for_each_entry(root, &acpi_pci_roots, node) {
301                 if (root->device->handle == handle)
302                         return root;
303         }
304         return NULL;
305 }
306
307 /**
308  * acpi_pci_osc_control_set - commit requested control to Firmware
309  * @handle: acpi_handle for the target ACPI object
310  * @flags: driver's requested control bits
311  *
312  * Attempt to take control from Firmware on requested control bits.
313  **/
314 acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 flags)
315 {
316         acpi_status status;
317         u32 control_req, result, capbuf[3];
318         acpi_handle tmp;
319         struct acpi_pci_root *root;
320
321         status = acpi_get_handle(handle, "_OSC", &tmp);
322         if (ACPI_FAILURE(status))
323                 return status;
324
325         control_req = (flags & OSC_CONTROL_MASKS);
326         if (!control_req)
327                 return AE_TYPE;
328
329         root = acpi_pci_find_root(handle);
330         if (!root)
331                 return AE_NOT_EXIST;
332
333         mutex_lock(&osc_lock);
334         /* No need to evaluate _OSC if the control was already granted. */
335         if ((root->osc_control_set & control_req) == control_req)
336                 goto out;
337
338         /* Need to query controls first before requesting them */
339         if (!root->osc_queried) {
340                 status = acpi_pci_query_osc(root, root->osc_support_set);
341                 if (ACPI_FAILURE(status))
342                         goto out;
343         }
344         if ((root->osc_control_qry & control_req) != control_req) {
345                 printk(KERN_DEBUG
346                        "Firmware did not grant requested _OSC control\n");
347                 status = AE_SUPPORT;
348                 goto out;
349         }
350
351         capbuf[OSC_QUERY_TYPE] = 0;
352         capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set;
353         capbuf[OSC_CONTROL_TYPE] = root->osc_control_set | control_req;
354         status = acpi_pci_run_osc(handle, capbuf, &result);
355         if (ACPI_SUCCESS(status))
356                 root->osc_control_set = result;
357 out:
358         mutex_unlock(&osc_lock);
359         return status;
360 }
361 EXPORT_SYMBOL(acpi_pci_osc_control_set);
362
363 static int __devinit acpi_pci_root_add(struct acpi_device *device)
364 {
365         unsigned long long segment, bus;
366         acpi_status status;
367         int result;
368         struct acpi_pci_root *root;
369         acpi_handle handle;
370         struct acpi_device *child;
371         u32 flags, base_flags;
372
373         segment = 0;
374         status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
375                                        &segment);
376         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
377                 printk(KERN_ERR PREFIX "can't evaluate _SEG\n");
378                 return -ENODEV;
379         }
380
381         /* Check _CRS first, then _BBN.  If no _BBN, default to zero. */
382         bus = 0;
383         status = try_get_root_bridge_busnr(device->handle, &bus);
384         if (ACPI_FAILURE(status)) {
385                 status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN,                                               NULL, &bus);
386                 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
387                         printk(KERN_ERR PREFIX
388                              "no bus number in _CRS and can't evaluate _BBN\n");
389                         return -ENODEV;
390                 }
391         }
392
393         root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
394         if (!root)
395                 return -ENOMEM;
396
397         INIT_LIST_HEAD(&root->node);
398         root->device = device;
399         root->segment = segment & 0xFFFF;
400         root->bus_nr = bus & 0xFF;
401         strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
402         strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
403         device->driver_data = root;
404
405         device->ops.bind = acpi_pci_bind;
406
407         /*
408          * All supported architectures that use ACPI have support for
409          * PCI domains, so we indicate this in _OSC support capabilities.
410          */
411         flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
412         acpi_pci_osc_support(root, flags);
413
414         /*
415          * TBD: Need PCI interface for enumeration/configuration of roots.
416          */
417
418         /* TBD: Locking */
419         list_add_tail(&root->node, &acpi_pci_roots);
420
421         printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n",
422                acpi_device_name(device), acpi_device_bid(device),
423                root->segment, root->bus_nr);
424
425         /*
426          * Scan the Root Bridge
427          * --------------------
428          * Must do this prior to any attempt to bind the root device, as the
429          * PCI namespace does not get created until this call is made (and 
430          * thus the root bridge's pci_dev does not exist).
431          */
432         root->bus = pci_acpi_scan_root(device, segment, bus);
433         if (!root->bus) {
434                 printk(KERN_ERR PREFIX
435                             "Bus %04x:%02x not present in PCI namespace\n",
436                             root->segment, root->bus_nr);
437                 result = -ENODEV;
438                 goto end;
439         }
440
441         /*
442          * Attach ACPI-PCI Context
443          * -----------------------
444          * Thus binding the ACPI and PCI devices.
445          */
446         result = acpi_pci_bind_root(device, &root->id, root->bus);
447         if (result)
448                 goto end;
449
450         /*
451          * PCI Routing Table
452          * -----------------
453          * Evaluate and parse _PRT, if exists.
454          */
455         status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
456         if (ACPI_SUCCESS(status))
457                 result = acpi_pci_irq_add_prt(device->handle, root->id.segment,
458                                               root->id.bus);
459
460         /*
461          * Scan and bind all _ADR-Based Devices
462          */
463         list_for_each_entry(child, &device->children, node)
464                 acpi_pci_bridge_scan(child);
465
466         /* Indicate support for various _OSC capabilities. */
467         if (pci_ext_cfg_avail(root->bus->self))
468                 flags |= OSC_EXT_PCI_CONFIG_SUPPORT;
469         if (pcie_aspm_enabled())
470                 flags |= OSC_ACTIVE_STATE_PWR_SUPPORT |
471                         OSC_CLOCK_PWR_CAPABILITY_SUPPORT;
472         if (pci_msi_enabled())
473                 flags |= OSC_MSI_SUPPORT;
474         if (flags != base_flags)
475                 acpi_pci_osc_support(root, flags);
476
477         return 0;
478
479 end:
480         if (!list_empty(&root->node))
481                 list_del(&root->node);
482         kfree(root);
483         return result;
484 }
485
486 static int acpi_pci_root_start(struct acpi_device *device)
487 {
488         struct acpi_pci_root *root = acpi_driver_data(device);
489
490         pci_bus_add_devices(root->bus);
491         return 0;
492 }
493
494 static int acpi_pci_root_remove(struct acpi_device *device, int type)
495 {
496         struct acpi_pci_root *root = acpi_driver_data(device);
497
498         kfree(root);
499         return 0;
500 }
501
502 static int __init acpi_pci_root_init(void)
503 {
504         if (acpi_pci_disabled)
505                 return 0;
506
507         if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
508                 return -ENODEV;
509
510         return 0;
511 }
512
513 subsys_initcall(acpi_pci_root_init);