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>
39 #define _COMPONENT ACPI_PCI_COMPONENT
40 ACPI_MODULE_NAME ("pci_root")
42 #define ACPI_PCI_ROOT_CLASS "pci_bridge"
43 #define ACPI_PCI_ROOT_HID "PNP0A03"
44 #define ACPI_PCI_ROOT_DRIVER_NAME "ACPI PCI Root Bridge Driver"
45 #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge"
47 static int acpi_pci_root_add (struct acpi_device *device);
48 static int acpi_pci_root_remove (struct acpi_device *device, int type);
49 static int acpi_pci_root_start (struct acpi_device *device);
51 static struct acpi_driver acpi_pci_root_driver = {
52 .name = ACPI_PCI_ROOT_DRIVER_NAME,
53 .class = ACPI_PCI_ROOT_CLASS,
54 .ids = ACPI_PCI_ROOT_HID,
56 .add = acpi_pci_root_add,
57 .remove = acpi_pci_root_remove,
58 .start = acpi_pci_root_start,
62 struct acpi_pci_root {
63 struct list_head node;
65 struct acpi_pci_id id;
69 static LIST_HEAD(acpi_pci_roots);
71 static struct acpi_pci_driver *sub_driver;
73 int acpi_pci_register_driver(struct acpi_pci_driver *driver)
76 struct list_head *entry;
78 struct acpi_pci_driver **pptr = &sub_driver;
80 pptr = &(*pptr)->next;
86 list_for_each(entry, &acpi_pci_roots) {
87 struct acpi_pci_root *root;
88 root = list_entry(entry, struct acpi_pci_root, node);
89 driver->add(root->handle);
95 EXPORT_SYMBOL(acpi_pci_register_driver);
97 void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
99 struct list_head *entry;
101 struct acpi_pci_driver **pptr = &sub_driver;
105 *pptr = (*pptr)->next;
112 list_for_each(entry, &acpi_pci_roots) {
113 struct acpi_pci_root *root;
114 root = list_entry(entry, struct acpi_pci_root, node);
115 driver->remove(root->handle);
118 EXPORT_SYMBOL(acpi_pci_unregister_driver);
121 get_root_bridge_busnr_callback (struct acpi_resource *resource, void *data)
123 int *busnr = (int *)data;
124 struct acpi_resource_address64 address;
126 if (resource->id != ACPI_RSTYPE_ADDRESS16 &&
127 resource->id != ACPI_RSTYPE_ADDRESS32 &&
128 resource->id != ACPI_RSTYPE_ADDRESS64)
131 acpi_resource_to_address64(resource, &address);
132 if ((address.address_length > 0) &&
133 (address.resource_type == ACPI_BUS_NUMBER_RANGE))
134 *busnr = address.min_address_range;
140 try_get_root_bridge_busnr(acpi_handle handle, int *busnum)
145 status = acpi_walk_resources(handle, METHOD_NAME__CRS, get_root_bridge_busnr_callback, busnum);
146 if (ACPI_FAILURE(status))
148 /* Check if we really get a bus number from _CRS */
156 struct acpi_device *device)
159 struct acpi_pci_root *root = NULL;
160 struct acpi_pci_root *tmp;
161 acpi_status status = AE_OK;
162 unsigned long value = 0;
163 acpi_handle handle = NULL;
165 ACPI_FUNCTION_TRACE("acpi_pci_root_add");
168 return_VALUE(-EINVAL);
170 root = kmalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
172 return_VALUE(-ENOMEM);
173 memset(root, 0, sizeof(struct acpi_pci_root));
174 INIT_LIST_HEAD(&root->node);
176 root->handle = device->handle;
177 strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
178 strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
179 acpi_driver_data(device) = root;
182 * TBD: Doesn't the bus driver automatically set this?
184 device->ops.bind = acpi_pci_bind;
189 * Obtained via _SEG, if exists, otherwise assumed to be zero (0).
191 status = acpi_evaluate_integer(root->handle, METHOD_NAME__SEG, NULL,
195 root->id.segment = (u16) value;
198 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
199 "Assuming segment 0 (no _SEG)\n"));
200 root->id.segment = 0;
203 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _SEG\n"));
211 * Obtained via _BBN, if exists, otherwise assumed to be zero (0).
213 status = acpi_evaluate_integer(root->handle, METHOD_NAME__BBN, NULL,
217 root->id.bus = (u16) value;
220 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Assuming bus 0 (no _BBN)\n"));
224 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _BBN\n"));
229 /* Some systems have wrong _BBN */
230 list_for_each_entry(tmp, &acpi_pci_roots, node) {
231 if ((tmp->id.segment == root->id.segment)
232 && (tmp->id.bus == root->id.bus)) {
236 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
237 "Wrong _BBN value, please reboot and using option 'pci=noacpi'\n"));
239 status = try_get_root_bridge_busnr(root->handle, &bus);
240 if (ACPI_FAILURE(status))
242 if (bus != root->id.bus) {
243 printk(KERN_INFO PREFIX "PCI _CRS %d overrides _BBN 0\n", bus);
252 * Obtained from _ADR (which has already been evaluated for us).
254 root->id.device = device->pnp.bus_address >> 16;
255 root->id.function = device->pnp.bus_address & 0xFFFF;
258 * TBD: Need PCI interface for enumeration/configuration of roots.
262 list_add_tail(&root->node, &acpi_pci_roots);
264 printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n",
265 acpi_device_name(device), acpi_device_bid(device),
266 root->id.segment, root->id.bus);
269 * Scan the Root Bridge
270 * --------------------
271 * Must do this prior to any attempt to bind the root device, as the
272 * PCI namespace does not get created until this call is made (and
273 * thus the root bridge's pci_dev does not exist).
275 root->bus = pci_acpi_scan_root(device, root->id.segment, root->id.bus);
277 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
278 "Bus %04x:%02x not present in PCI namespace\n",
279 root->id.segment, root->id.bus));
285 * Attach ACPI-PCI Context
286 * -----------------------
287 * Thus binding the ACPI and PCI devices.
289 result = acpi_pci_bind_root(device, &root->id, root->bus);
296 * Evaluate and parse _PRT, if exists.
298 status = acpi_get_handle(root->handle, METHOD_NAME__PRT, &handle);
299 if (ACPI_SUCCESS(status))
300 result = acpi_pci_irq_add_prt(root->handle, root->id.segment,
305 if (!list_empty(&root->node))
306 list_del(&root->node);
310 return_VALUE(result);
314 acpi_pci_root_start (
315 struct acpi_device *device)
317 struct acpi_pci_root *root;
319 ACPI_FUNCTION_TRACE("acpi_pci_root_start");
321 list_for_each_entry(root, &acpi_pci_roots, node) {
322 if (root->handle == device->handle) {
323 pci_bus_add_devices(root->bus);
327 return_VALUE(-ENODEV);
331 acpi_pci_root_remove (
332 struct acpi_device *device,
335 struct acpi_pci_root *root = NULL;
337 ACPI_FUNCTION_TRACE("acpi_pci_root_remove");
339 if (!device || !acpi_driver_data(device))
340 return_VALUE(-EINVAL);
342 root = (struct acpi_pci_root *) acpi_driver_data(device);
350 static int __init acpi_pci_root_init (void)
352 ACPI_FUNCTION_TRACE("acpi_pci_root_init");
354 if (acpi_pci_disabled)
358 acpi_dbg_layer = ACPI_PCI_COMPONENT;
359 acpi_dbg_level = 0xFFFFFFFF;
362 if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
363 return_VALUE(-ENODEV);
368 subsys_initcall(acpi_pci_root_init);