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/acpi.h>
35 #include <acpi/acpi_bus.h>
36 #include <acpi/acpi_drivers.h>
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_HID "PNP0A03"
42 #define ACPI_PCI_ROOT_DRIVER_NAME "ACPI PCI Root Bridge Driver"
43 #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge"
44 static int acpi_pci_root_add(struct acpi_device *device);
45 static int acpi_pci_root_remove(struct acpi_device *device, int type);
46 static int acpi_pci_root_start(struct acpi_device *device);
48 static struct acpi_driver acpi_pci_root_driver = {
49 .name = ACPI_PCI_ROOT_DRIVER_NAME,
50 .class = ACPI_PCI_ROOT_CLASS,
51 .ids = ACPI_PCI_ROOT_HID,
53 .add = acpi_pci_root_add,
54 .remove = acpi_pci_root_remove,
55 .start = acpi_pci_root_start,
59 struct acpi_pci_root {
60 struct list_head node;
61 struct acpi_device * device;
62 struct acpi_pci_id id;
66 static LIST_HEAD(acpi_pci_roots);
68 static struct acpi_pci_driver *sub_driver;
70 int acpi_pci_register_driver(struct acpi_pci_driver *driver)
73 struct list_head *entry;
75 struct acpi_pci_driver **pptr = &sub_driver;
77 pptr = &(*pptr)->next;
83 list_for_each(entry, &acpi_pci_roots) {
84 struct acpi_pci_root *root;
85 root = list_entry(entry, struct acpi_pci_root, node);
86 driver->add(root->device->handle);
93 EXPORT_SYMBOL(acpi_pci_register_driver);
95 void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
97 struct list_head *entry;
99 struct acpi_pci_driver **pptr = &sub_driver;
103 *pptr = (*pptr)->next;
110 list_for_each(entry, &acpi_pci_roots) {
111 struct acpi_pci_root *root;
112 root = list_entry(entry, struct acpi_pci_root, node);
113 driver->remove(root->device->handle);
117 EXPORT_SYMBOL(acpi_pci_unregister_driver);
120 get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
122 int *busnr = (int *)data;
123 struct acpi_resource_address64 address;
125 if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
126 resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
127 resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
130 acpi_resource_to_address64(resource, &address);
131 if ((address.address_length > 0) &&
132 (address.resource_type == ACPI_BUS_NUMBER_RANGE))
133 *busnr = address.minimum;
138 static acpi_status try_get_root_bridge_busnr(acpi_handle handle, int *busnum)
144 acpi_walk_resources(handle, METHOD_NAME__CRS,
145 get_root_bridge_busnr_callback, busnum);
146 if (ACPI_FAILURE(status))
148 /* Check if we really get a bus number from _CRS */
154 static void acpi_pci_bridge_scan(struct acpi_device *device)
157 struct acpi_device *child = NULL;
159 if (device->flags.bus_address)
160 if (device->parent && device->parent->ops.bind) {
161 status = device->parent->ops.bind(device);
163 list_for_each_entry(child, &device->children, node)
164 acpi_pci_bridge_scan(child);
169 static int acpi_pci_root_add(struct acpi_device *device)
172 struct acpi_pci_root *root = NULL;
173 struct acpi_pci_root *tmp;
174 acpi_status status = AE_OK;
175 unsigned long value = 0;
176 acpi_handle handle = NULL;
177 struct acpi_device *child;
183 root = kmalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
186 memset(root, 0, sizeof(struct acpi_pci_root));
187 INIT_LIST_HEAD(&root->node);
189 root->device = device;
190 strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
191 strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
192 acpi_driver_data(device) = root;
194 device->ops.bind = acpi_pci_bind;
199 * Obtained via _SEG, if exists, otherwise assumed to be zero (0).
201 status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
205 root->id.segment = (u16) value;
208 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
209 "Assuming segment 0 (no _SEG)\n"));
210 root->id.segment = 0;
213 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SEG"));
221 * Obtained via _BBN, if exists, otherwise assumed to be zero (0).
223 status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, NULL,
227 root->id.bus = (u16) value;
230 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Assuming bus 0 (no _BBN)\n"));
234 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BBN"));
239 /* Some systems have wrong _BBN */
240 list_for_each_entry(tmp, &acpi_pci_roots, node) {
241 if ((tmp->id.segment == root->id.segment)
242 && (tmp->id.bus == root->id.bus)) {
246 printk(KERN_ERR PREFIX
247 "Wrong _BBN value, reboot"
248 " and use option 'pci=noacpi'\n");
250 status = try_get_root_bridge_busnr(device->handle, &bus);
251 if (ACPI_FAILURE(status))
253 if (bus != root->id.bus) {
254 printk(KERN_INFO PREFIX
255 "PCI _CRS %d overrides _BBN 0\n", bus);
264 * Obtained from _ADR (which has already been evaluated for us).
266 root->id.device = device->pnp.bus_address >> 16;
267 root->id.function = device->pnp.bus_address & 0xFFFF;
270 * TBD: Need PCI interface for enumeration/configuration of roots.
274 list_add_tail(&root->node, &acpi_pci_roots);
276 printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n",
277 acpi_device_name(device), acpi_device_bid(device),
278 root->id.segment, root->id.bus);
281 * Scan the Root Bridge
282 * --------------------
283 * Must do this prior to any attempt to bind the root device, as the
284 * PCI namespace does not get created until this call is made (and
285 * thus the root bridge's pci_dev does not exist).
287 root->bus = pci_acpi_scan_root(device, root->id.segment, root->id.bus);
289 printk(KERN_ERR PREFIX
290 "Bus %04x:%02x not present in PCI namespace\n",
291 root->id.segment, root->id.bus);
297 * Attach ACPI-PCI Context
298 * -----------------------
299 * Thus binding the ACPI and PCI devices.
301 result = acpi_pci_bind_root(device, &root->id, root->bus);
308 * Evaluate and parse _PRT, if exists.
310 status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
311 if (ACPI_SUCCESS(status))
312 result = acpi_pci_irq_add_prt(device->handle, root->id.segment,
316 * Scan and bind all _ADR-Based Devices
318 list_for_each_entry(child, &device->children, node)
319 acpi_pci_bridge_scan(child);
323 if (!list_empty(&root->node))
324 list_del(&root->node);
331 static int acpi_pci_root_start(struct acpi_device *device)
333 struct acpi_pci_root *root;
336 list_for_each_entry(root, &acpi_pci_roots, node) {
337 if (root->device == device) {
338 pci_bus_add_devices(root->bus);
345 static int acpi_pci_root_remove(struct acpi_device *device, int type)
347 struct acpi_pci_root *root = NULL;
350 if (!device || !acpi_driver_data(device))
353 root = (struct acpi_pci_root *)acpi_driver_data(device);
360 static int __init acpi_pci_root_init(void)
363 if (acpi_pci_disabled)
367 acpi_dbg_layer = ACPI_PCI_COMPONENT;
368 acpi_dbg_level = 0xFFFFFFFF;
371 if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
377 subsys_initcall(acpi_pci_root_init);