2 * pci_bind.c - ACPI PCI Device Binding ($Revision: 2 $)
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_bind");
41 struct acpi_pci_data {
42 struct acpi_pci_id id;
47 static void acpi_pci_data_handler(acpi_handle handle, u32 function,
51 /* TBD: Anything we need to do here? */
59 * This function is used by the ACPI Interpreter (a.k.a. Core Subsystem)
60 * to resolve PCI information for ACPI-PCI devices defined in the namespace.
61 * This typically occurs when resolving PCI operation region information.
63 acpi_status acpi_get_pci_id(acpi_handle handle, struct acpi_pci_id *id)
66 acpi_status status = AE_OK;
67 struct acpi_device *device = NULL;
68 struct acpi_pci_data *data = NULL;
72 return AE_BAD_PARAMETER;
74 result = acpi_bus_get_device(handle, &device);
76 printk(KERN_ERR PREFIX
77 "Invalid ACPI Bus context for device %s\n",
78 acpi_device_bid(device));
82 status = acpi_get_data(handle, acpi_pci_data_handler, (void **)&data);
83 if (ACPI_FAILURE(status) || !data) {
84 ACPI_EXCEPTION((AE_INFO, status,
85 "Invalid ACPI-PCI context for device %s",
86 acpi_device_bid(device)));
93 id->segment = data->id.segment;
94 id->bus = data->id.bus;
95 id->device = data->id.device;
96 id->function = data->id.function;
99 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
100 "Device %s has PCI address %02x:%02x:%02x.%02x\n",
101 acpi_device_bid(device), id->segment, id->bus,
102 id->device, id->function));
107 EXPORT_SYMBOL(acpi_get_pci_id);
109 int acpi_pci_bind(struct acpi_device *device)
112 acpi_status status = AE_OK;
113 struct acpi_pci_data *data = NULL;
114 struct acpi_pci_data *pdata = NULL;
115 char *pathname = NULL;
116 struct acpi_buffer buffer = { 0, NULL };
117 acpi_handle handle = NULL;
122 if (!device || !device->parent)
125 pathname = kzalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
128 buffer.length = ACPI_PATHNAME_MAX;
129 buffer.pointer = pathname;
131 data = kzalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
137 acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
138 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI device [%s]...\n",
144 * These are obtained via the parent device's ACPI-PCI context.
146 status = acpi_get_data(device->parent->handle, acpi_pci_data_handler,
148 if (ACPI_FAILURE(status) || !pdata || !pdata->bus) {
149 ACPI_EXCEPTION((AE_INFO, status,
150 "Invalid ACPI-PCI context for parent device %s",
151 acpi_device_bid(device->parent)));
155 data->id.segment = pdata->id.segment;
156 data->id.bus = pdata->bus->number;
161 * These are simply obtained from the device's _ADR method. Note
162 * that a value of zero is valid.
164 data->id.device = device->pnp.bus_address >> 16;
165 data->id.function = device->pnp.bus_address & 0xFFFF;
167 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "...to %02x:%02x:%02x.%02x\n",
168 data->id.segment, data->id.bus, data->id.device,
172 * TBD: Support slot devices (e.g. function=0xFFFF).
178 * Locate matching device in PCI namespace. If it doesn't exist
179 * this typically means that the device isn't currently inserted
180 * (e.g. docking station, port replicator, etc.).
181 * We cannot simply search the global pci device list, since
182 * PCI devices are added to the global pci list when the root
183 * bridge start ops are run, which may not have happened yet.
185 bus = pci_find_bus(data->id.segment, data->id.bus);
187 list_for_each_entry(dev, &bus->devices, bus_list) {
188 if (dev->devfn == PCI_DEVFN(data->id.device,
189 data->id.function)) {
196 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
197 "Device %02x:%02x:%02x.%02x not present in PCI namespace\n",
198 data->id.segment, data->id.bus,
199 data->id.device, data->id.function));
203 if (!data->dev->bus) {
204 printk(KERN_ERR PREFIX
205 "Device %02x:%02x:%02x.%02x has invalid 'bus' field\n",
206 data->id.segment, data->id.bus,
207 data->id.device, data->id.function);
215 * If so, set the 'bus' field and install the 'bind' function to
216 * facilitate callbacks for all of its children.
218 if (data->dev->subordinate) {
219 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
220 "Device %02x:%02x:%02x.%02x is a PCI bridge\n",
221 data->id.segment, data->id.bus,
222 data->id.device, data->id.function));
223 data->bus = data->dev->subordinate;
224 device->ops.bind = acpi_pci_bind;
225 device->ops.unbind = acpi_pci_unbind;
229 * Attach ACPI-PCI Context
230 * -----------------------
231 * Thus binding the ACPI and PCI devices.
233 status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
234 if (ACPI_FAILURE(status)) {
235 ACPI_EXCEPTION((AE_INFO, status,
236 "Unable to attach ACPI-PCI context to device %s",
237 acpi_device_bid(device)));
245 * Evaluate and parse _PRT, if exists. This code is independent of
246 * PCI bridges (above) to allow parsing of _PRT objects within the
247 * scope of non-bridge devices. Note that _PRTs within the scope of
248 * a PCI bridge assume the bridge's subordinate bus number.
250 * TBD: Can _PRTs exist within the scope of non-bridge PCI devices?
252 status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
253 if (ACPI_SUCCESS(status)) {
254 if (data->bus) /* PCI-PCI bridge */
255 acpi_pci_irq_add_prt(device->handle, data->id.segment,
257 else /* non-bridge PCI device */
258 acpi_pci_irq_add_prt(device->handle, data->id.segment,
270 int acpi_pci_unbind(struct acpi_device *device)
273 acpi_status status = AE_OK;
274 struct acpi_pci_data *data = NULL;
275 char *pathname = NULL;
276 struct acpi_buffer buffer = { 0, NULL };
279 if (!device || !device->parent)
282 pathname = kzalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
286 buffer.length = ACPI_PATHNAME_MAX;
287 buffer.pointer = pathname;
288 acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
289 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Unbinding PCI device [%s]...\n",
294 acpi_get_data(device->handle, acpi_pci_data_handler,
296 if (ACPI_FAILURE(status)) {
301 status = acpi_detach_data(device->handle, acpi_pci_data_handler);
302 if (ACPI_FAILURE(status)) {
303 ACPI_EXCEPTION((AE_INFO, status,
304 "Unable to detach data from device %s",
305 acpi_device_bid(device)));
309 if (data->dev->subordinate) {
310 acpi_pci_irq_del_prt(data->id.segment, data->bus->number);
319 acpi_pci_bind_root(struct acpi_device *device,
320 struct acpi_pci_id *id, struct pci_bus *bus)
323 acpi_status status = AE_OK;
324 struct acpi_pci_data *data = NULL;
325 char *pathname = NULL;
326 struct acpi_buffer buffer = { 0, NULL };
328 pathname = kzalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
332 buffer.length = ACPI_PATHNAME_MAX;
333 buffer.pointer = pathname;
335 if (!device || !id || !bus) {
340 data = kzalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
348 device->ops.bind = acpi_pci_bind;
349 device->ops.unbind = acpi_pci_unbind;
351 acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
353 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI root bridge [%s] to "
354 "%02x:%02x\n", pathname, id->segment, id->bus));
356 status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
357 if (ACPI_FAILURE(status)) {
358 ACPI_EXCEPTION((AE_INFO, status,
359 "Unable to attach ACPI-PCI context to device %s",