2 * pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $)
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
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.
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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>
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>
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
);
47 static struct acpi_device_id root_device_ids
[] = {
51 MODULE_DEVICE_TABLE(acpi
, root_device_ids
);
53 static struct acpi_driver acpi_pci_root_driver
= {
55 .class = ACPI_PCI_ROOT_CLASS
,
56 .ids
= root_device_ids
,
58 .add
= acpi_pci_root_add
,
59 .remove
= acpi_pci_root_remove
,
60 .start
= acpi_pci_root_start
,
64 struct acpi_pci_root
{
65 struct list_head node
;
66 struct acpi_device
* device
;
67 struct acpi_pci_id id
;
70 u32 osc_support_set
; /* _OSC state of support bits */
71 u32 osc_control_set
; /* _OSC state of control bits */
72 u32 osc_control_qry
; /* the latest _OSC query result */
74 u32 osc_queried
:1; /* has _OSC control been queried? */
77 static LIST_HEAD(acpi_pci_roots
);
79 static struct acpi_pci_driver
*sub_driver
;
80 static DEFINE_MUTEX(osc_lock
);
82 int acpi_pci_register_driver(struct acpi_pci_driver
*driver
)
85 struct acpi_pci_root
*root
;
87 struct acpi_pci_driver
**pptr
= &sub_driver
;
89 pptr
= &(*pptr
)->next
;
95 list_for_each_entry(root
, &acpi_pci_roots
, node
) {
96 driver
->add(root
->device
->handle
);
103 EXPORT_SYMBOL(acpi_pci_register_driver
);
105 void acpi_pci_unregister_driver(struct acpi_pci_driver
*driver
)
107 struct acpi_pci_root
*root
;
109 struct acpi_pci_driver
**pptr
= &sub_driver
;
113 pptr
= &(*pptr
)->next
;
116 *pptr
= (*pptr
)->next
;
121 list_for_each_entry(root
, &acpi_pci_roots
, node
)
122 driver
->remove(root
->device
->handle
);
125 EXPORT_SYMBOL(acpi_pci_unregister_driver
);
127 acpi_handle
acpi_get_pci_rootbridge_handle(unsigned int seg
, unsigned int bus
)
129 struct acpi_pci_root
*root
;
131 list_for_each_entry(root
, &acpi_pci_roots
, node
)
132 if ((root
->id
.segment
== (u16
) seg
) && (root
->id
.bus
== (u16
) bus
))
133 return root
->device
->handle
;
137 EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle
);
140 get_root_bridge_busnr_callback(struct acpi_resource
*resource
, void *data
)
143 struct acpi_resource_address64 address
;
145 if (resource
->type
!= ACPI_RESOURCE_TYPE_ADDRESS16
&&
146 resource
->type
!= ACPI_RESOURCE_TYPE_ADDRESS32
&&
147 resource
->type
!= ACPI_RESOURCE_TYPE_ADDRESS64
)
150 acpi_resource_to_address64(resource
, &address
);
151 if ((address
.address_length
> 0) &&
152 (address
.resource_type
== ACPI_BUS_NUMBER_RANGE
))
153 *busnr
= address
.minimum
;
158 static acpi_status
try_get_root_bridge_busnr(acpi_handle handle
,
159 unsigned long long *bus
)
166 acpi_walk_resources(handle
, METHOD_NAME__CRS
,
167 get_root_bridge_busnr_callback
, &busnum
);
168 if (ACPI_FAILURE(status
))
170 /* Check if we really get a bus number from _CRS */
177 static void acpi_pci_bridge_scan(struct acpi_device
*device
)
180 struct acpi_device
*child
= NULL
;
182 if (device
->flags
.bus_address
)
183 if (device
->parent
&& device
->parent
->ops
.bind
) {
184 status
= device
->parent
->ops
.bind(device
);
186 list_for_each_entry(child
, &device
->children
, node
)
187 acpi_pci_bridge_scan(child
);
192 static u8 OSC_UUID
[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40,
193 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
195 static acpi_status
acpi_pci_run_osc(acpi_handle handle
,
196 const u32
*capbuf
, u32
*retval
)
199 struct acpi_object_list input
;
200 union acpi_object in_params
[4];
201 struct acpi_buffer output
= {ACPI_ALLOCATE_BUFFER
, NULL
};
202 union acpi_object
*out_obj
;
205 /* Setting up input parameters */
207 input
.pointer
= in_params
;
208 in_params
[0].type
= ACPI_TYPE_BUFFER
;
209 in_params
[0].buffer
.length
= 16;
210 in_params
[0].buffer
.pointer
= OSC_UUID
;
211 in_params
[1].type
= ACPI_TYPE_INTEGER
;
212 in_params
[1].integer
.value
= 1;
213 in_params
[2].type
= ACPI_TYPE_INTEGER
;
214 in_params
[2].integer
.value
= 3;
215 in_params
[3].type
= ACPI_TYPE_BUFFER
;
216 in_params
[3].buffer
.length
= 12;
217 in_params
[3].buffer
.pointer
= (u8
*)capbuf
;
219 status
= acpi_evaluate_object(handle
, "_OSC", &input
, &output
);
220 if (ACPI_FAILURE(status
))
224 return AE_NULL_OBJECT
;
226 out_obj
= output
.pointer
;
227 if (out_obj
->type
!= ACPI_TYPE_BUFFER
) {
228 printk(KERN_DEBUG
"_OSC evaluation returned wrong type\n");
232 /* Need to ignore the bit0 in result code */
233 errors
= *((u32
*)out_obj
->buffer
.pointer
) & ~(1 << 0);
235 if (errors
& OSC_REQUEST_ERROR
)
236 printk(KERN_DEBUG
"_OSC request failed\n");
237 if (errors
& OSC_INVALID_UUID_ERROR
)
238 printk(KERN_DEBUG
"_OSC invalid UUID\n");
239 if (errors
& OSC_INVALID_REVISION_ERROR
)
240 printk(KERN_DEBUG
"_OSC invalid revision\n");
241 if (errors
& OSC_CAPABILITIES_MASK_ERROR
) {
242 if (capbuf
[OSC_QUERY_TYPE
] & OSC_QUERY_ENABLE
)
245 "Firmware did not grant requested _OSC control\n");
253 *retval
= *((u32
*)(out_obj
->buffer
.pointer
+ 8));
257 kfree(output
.pointer
);
261 static acpi_status
acpi_pci_query_osc(struct acpi_pci_root
*root
, u32 flags
)
264 u32 support_set
, result
, capbuf
[3];
266 /* do _OSC query for all possible controls */
267 support_set
= root
->osc_support_set
| (flags
& OSC_SUPPORT_MASKS
);
268 capbuf
[OSC_QUERY_TYPE
] = OSC_QUERY_ENABLE
;
269 capbuf
[OSC_SUPPORT_TYPE
] = support_set
;
270 capbuf
[OSC_CONTROL_TYPE
] = OSC_CONTROL_MASKS
;
272 status
= acpi_pci_run_osc(root
->device
->handle
, capbuf
, &result
);
273 if (ACPI_SUCCESS(status
)) {
274 root
->osc_support_set
= support_set
;
275 root
->osc_control_qry
= result
;
276 root
->osc_queried
= 1;
281 static acpi_status
acpi_pci_osc_support(struct acpi_pci_root
*root
, u32 flags
)
286 status
= acpi_get_handle(root
->device
->handle
, "_OSC", &tmp
);
287 if (ACPI_FAILURE(status
))
289 mutex_lock(&osc_lock
);
290 status
= acpi_pci_query_osc(root
, flags
);
291 mutex_unlock(&osc_lock
);
295 static struct acpi_pci_root
*acpi_pci_find_root(acpi_handle handle
)
297 struct acpi_pci_root
*root
;
299 list_for_each_entry(root
, &acpi_pci_roots
, node
) {
300 if (root
->device
->handle
== handle
)
307 * acpi_pci_osc_control_set - commit requested control to Firmware
308 * @handle: acpi_handle for the target ACPI object
309 * @flags: driver's requested control bits
311 * Attempt to take control from Firmware on requested control bits.
313 acpi_status
acpi_pci_osc_control_set(acpi_handle handle
, u32 flags
)
316 u32 control_req
, result
, capbuf
[3];
318 struct acpi_pci_root
*root
;
320 status
= acpi_get_handle(handle
, "_OSC", &tmp
);
321 if (ACPI_FAILURE(status
))
324 control_req
= (flags
& OSC_CONTROL_MASKS
);
328 root
= acpi_pci_find_root(handle
);
332 mutex_lock(&osc_lock
);
333 /* No need to evaluate _OSC if the control was already granted. */
334 if ((root
->osc_control_set
& control_req
) == control_req
)
337 /* Need to query controls first before requesting them */
338 if (!root
->osc_queried
) {
339 status
= acpi_pci_query_osc(root
, root
->osc_support_set
);
340 if (ACPI_FAILURE(status
))
343 if ((root
->osc_control_qry
& control_req
) != control_req
) {
345 "Firmware did not grant requested _OSC control\n");
350 capbuf
[OSC_QUERY_TYPE
] = 0;
351 capbuf
[OSC_SUPPORT_TYPE
] = root
->osc_support_set
;
352 capbuf
[OSC_CONTROL_TYPE
] = root
->osc_control_set
| control_req
;
353 status
= acpi_pci_run_osc(handle
, capbuf
, &result
);
354 if (ACPI_SUCCESS(status
))
355 root
->osc_control_set
= result
;
357 mutex_unlock(&osc_lock
);
360 EXPORT_SYMBOL(acpi_pci_osc_control_set
);
362 static int __devinit
acpi_pci_root_add(struct acpi_device
*device
)
364 unsigned long long segment
, bus
;
367 struct acpi_pci_root
*root
;
369 struct acpi_device
*child
;
370 u32 flags
, base_flags
;
373 status
= acpi_evaluate_integer(device
->handle
, METHOD_NAME__SEG
, NULL
,
375 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
) {
376 printk(KERN_ERR PREFIX
"can't evaluate _SEG\n");
380 /* Check _CRS first, then _BBN. If no _BBN, default to zero. */
382 status
= try_get_root_bridge_busnr(device
->handle
, &bus
);
383 if (ACPI_FAILURE(status
)) {
384 status
= acpi_evaluate_integer(device
->handle
, METHOD_NAME__BBN
, NULL
, &bus
);
385 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
) {
386 printk(KERN_ERR PREFIX
387 "no bus number in _CRS and can't evaluate _BBN\n");
392 root
= kzalloc(sizeof(struct acpi_pci_root
), GFP_KERNEL
);
396 INIT_LIST_HEAD(&root
->node
);
397 root
->device
= device
;
398 strcpy(acpi_device_name(device
), ACPI_PCI_ROOT_DEVICE_NAME
);
399 strcpy(acpi_device_class(device
), ACPI_PCI_ROOT_CLASS
);
400 device
->driver_data
= root
;
402 device
->ops
.bind
= acpi_pci_bind
;
405 * All supported architectures that use ACPI have support for
406 * PCI domains, so we indicate this in _OSC support capabilities.
408 flags
= base_flags
= OSC_PCI_SEGMENT_GROUPS_SUPPORT
;
409 acpi_pci_osc_support(root
, flags
);
414 * Obtained from _ADR (which has already been evaluated for us).
416 root
->id
.segment
= segment
& 0xFFFF;
417 root
->id
.bus
= bus
& 0xFF;
418 root
->id
.device
= device
->pnp
.bus_address
>> 16;
419 root
->id
.function
= device
->pnp
.bus_address
& 0xFFFF;
422 * TBD: Need PCI interface for enumeration/configuration of roots.
426 list_add_tail(&root
->node
, &acpi_pci_roots
);
428 printk(KERN_INFO PREFIX
"%s [%s] (%04x:%02x)\n",
429 acpi_device_name(device
), acpi_device_bid(device
),
430 root
->id
.segment
, root
->id
.bus
);
433 * Scan the Root Bridge
434 * --------------------
435 * Must do this prior to any attempt to bind the root device, as the
436 * PCI namespace does not get created until this call is made (and
437 * thus the root bridge's pci_dev does not exist).
439 root
->bus
= pci_acpi_scan_root(device
, root
->id
.segment
, root
->id
.bus
);
441 printk(KERN_ERR PREFIX
442 "Bus %04x:%02x not present in PCI namespace\n",
443 root
->id
.segment
, root
->id
.bus
);
449 * Attach ACPI-PCI Context
450 * -----------------------
451 * Thus binding the ACPI and PCI devices.
453 result
= acpi_pci_bind_root(device
, &root
->id
, root
->bus
);
460 * Evaluate and parse _PRT, if exists.
462 status
= acpi_get_handle(device
->handle
, METHOD_NAME__PRT
, &handle
);
463 if (ACPI_SUCCESS(status
))
464 result
= acpi_pci_irq_add_prt(device
->handle
, root
->id
.segment
,
468 * Scan and bind all _ADR-Based Devices
470 list_for_each_entry(child
, &device
->children
, node
)
471 acpi_pci_bridge_scan(child
);
473 /* Indicate support for various _OSC capabilities. */
474 if (pci_ext_cfg_avail(root
->bus
->self
))
475 flags
|= OSC_EXT_PCI_CONFIG_SUPPORT
;
476 if (pcie_aspm_enabled())
477 flags
|= OSC_ACTIVE_STATE_PWR_SUPPORT
|
478 OSC_CLOCK_PWR_CAPABILITY_SUPPORT
;
479 if (pci_msi_enabled())
480 flags
|= OSC_MSI_SUPPORT
;
481 if (flags
!= base_flags
)
482 acpi_pci_osc_support(root
, flags
);
487 if (!list_empty(&root
->node
))
488 list_del(&root
->node
);
493 static int acpi_pci_root_start(struct acpi_device
*device
)
495 struct acpi_pci_root
*root
= acpi_driver_data(device
);
497 pci_bus_add_devices(root
->bus
);
501 static int acpi_pci_root_remove(struct acpi_device
*device
, int type
)
503 struct acpi_pci_root
*root
= acpi_driver_data(device
);
509 static int __init
acpi_pci_root_init(void)
511 if (acpi_pci_disabled
)
514 if (acpi_bus_register_driver(&acpi_pci_root_driver
) < 0)
520 subsys_initcall(acpi_pci_root_init
);