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;
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->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->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 int acpi_pci_root_add(struct acpi_device *device)
157 struct acpi_pci_root *root = NULL;
158 struct acpi_pci_root *tmp;
159 acpi_status status = AE_OK;
160 unsigned long value = 0;
161 acpi_handle handle = NULL;
163 ACPI_FUNCTION_TRACE("acpi_pci_root_add");
166 return_VALUE(-EINVAL);
168 root = kmalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
170 return_VALUE(-ENOMEM);
171 memset(root, 0, sizeof(struct acpi_pci_root));
172 INIT_LIST_HEAD(&root->node);
174 root->handle = device->handle;
175 strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
176 strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
177 acpi_driver_data(device) = root;
180 * TBD: Doesn't the bus driver automatically set this?
182 device->ops.bind = acpi_pci_bind;
187 * Obtained via _SEG, if exists, otherwise assumed to be zero (0).
189 status = acpi_evaluate_integer(root->handle, METHOD_NAME__SEG, NULL,
193 root->id.segment = (u16) value;
196 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
197 "Assuming segment 0 (no _SEG)\n"));
198 root->id.segment = 0;
201 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _SEG\n"));
209 * Obtained via _BBN, if exists, otherwise assumed to be zero (0).
211 status = acpi_evaluate_integer(root->handle, METHOD_NAME__BBN, NULL,
215 root->id.bus = (u16) value;
218 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Assuming bus 0 (no _BBN)\n"));
222 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _BBN\n"));
227 /* Some systems have wrong _BBN */
228 list_for_each_entry(tmp, &acpi_pci_roots, node) {
229 if ((tmp->id.segment == root->id.segment)
230 && (tmp->id.bus == root->id.bus)) {
234 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
235 "Wrong _BBN value, please reboot and using option 'pci=noacpi'\n"));
237 status = try_get_root_bridge_busnr(root->handle, &bus);
238 if (ACPI_FAILURE(status))
240 if (bus != root->id.bus) {
241 printk(KERN_INFO PREFIX
242 "PCI _CRS %d overrides _BBN 0\n", bus);
251 * Obtained from _ADR (which has already been evaluated for us).
253 root->id.device = device->pnp.bus_address >> 16;
254 root->id.function = device->pnp.bus_address & 0xFFFF;
257 * TBD: Need PCI interface for enumeration/configuration of roots.
261 list_add_tail(&root->node, &acpi_pci_roots);
263 printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n",
264 acpi_device_name(device), acpi_device_bid(device),
265 root->id.segment, root->id.bus);
268 * Scan the Root Bridge
269 * --------------------
270 * Must do this prior to any attempt to bind the root device, as the
271 * PCI namespace does not get created until this call is made (and
272 * thus the root bridge's pci_dev does not exist).
274 root->bus = pci_acpi_scan_root(device, root->id.segment, root->id.bus);
276 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
277 "Bus %04x:%02x not present in PCI namespace\n",
278 root->id.segment, root->id.bus));
284 * Attach ACPI-PCI Context
285 * -----------------------
286 * Thus binding the ACPI and PCI devices.
288 result = acpi_pci_bind_root(device, &root->id, root->bus);
295 * Evaluate and parse _PRT, if exists.
297 status = acpi_get_handle(root->handle, METHOD_NAME__PRT, &handle);
298 if (ACPI_SUCCESS(status))
299 result = acpi_pci_irq_add_prt(root->handle, root->id.segment,
304 if (!list_empty(&root->node))
305 list_del(&root->node);
309 return_VALUE(result);
312 static int acpi_pci_root_start(struct acpi_device *device)
314 struct acpi_pci_root *root;
316 ACPI_FUNCTION_TRACE("acpi_pci_root_start");
318 list_for_each_entry(root, &acpi_pci_roots, node) {
319 if (root->handle == device->handle) {
320 pci_bus_add_devices(root->bus);
324 return_VALUE(-ENODEV);
327 static int acpi_pci_root_remove(struct acpi_device *device, int type)
329 struct acpi_pci_root *root = NULL;
331 ACPI_FUNCTION_TRACE("acpi_pci_root_remove");
333 if (!device || !acpi_driver_data(device))
334 return_VALUE(-EINVAL);
336 root = (struct acpi_pci_root *)acpi_driver_data(device);
343 static int __init acpi_pci_root_init(void)
345 ACPI_FUNCTION_TRACE("acpi_pci_root_init");
347 if (acpi_pci_disabled)
351 acpi_dbg_layer = ACPI_PCI_COMPONENT;
352 acpi_dbg_level = 0xFFFFFFFF;
355 if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
356 return_VALUE(-ENODEV);
361 subsys_initcall(acpi_pci_root_init);