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 int acpi_pci_unbind(struct acpi_device *device);
49 static void acpi_pci_data_handler(acpi_handle handle, u32 function,
53 /* TBD: Anything we need to do here? */
61 * This function is used by the ACPI Interpreter (a.k.a. Core Subsystem)
62 * to resolve PCI information for ACPI-PCI devices defined in the namespace.
63 * This typically occurs when resolving PCI operation region information.
65 acpi_status acpi_get_pci_id(acpi_handle handle, struct acpi_pci_id *id)
68 acpi_status status = AE_OK;
69 struct acpi_device *device = NULL;
70 struct acpi_pci_data *data = NULL;
74 return AE_BAD_PARAMETER;
76 result = acpi_bus_get_device(handle, &device);
78 printk(KERN_ERR PREFIX
79 "Invalid ACPI Bus context for device %s\n",
80 acpi_device_bid(device));
84 status = acpi_get_data(handle, acpi_pci_data_handler, (void **)&data);
85 if (ACPI_FAILURE(status) || !data) {
86 ACPI_EXCEPTION((AE_INFO, status,
87 "Invalid ACPI-PCI context for device %s",
88 acpi_device_bid(device)));
95 id->segment = data->id.segment;
96 id->bus = data->id.bus;
97 id->device = data->id.device;
98 id->function = data->id.function;
101 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
102 "Device %s has PCI address %04x:%02x:%02x.%d\n",
103 acpi_device_bid(device), id->segment, id->bus,
104 id->device, id->function));
109 EXPORT_SYMBOL(acpi_get_pci_id);
111 int acpi_pci_bind(struct acpi_device *device)
115 struct acpi_pci_data *data;
116 struct acpi_pci_data *pdata;
117 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
123 if (!device || !device->parent)
126 data = kzalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
130 status = acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
131 if (ACPI_FAILURE(status)) {
136 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI device [%s]...\n",
137 (char *)buffer.pointer));
142 * These are obtained via the parent device's ACPI-PCI context.
144 status = acpi_get_data(device->parent->handle, acpi_pci_data_handler,
146 if (ACPI_FAILURE(status) || !pdata || !pdata->bus) {
147 ACPI_EXCEPTION((AE_INFO, status,
148 "Invalid ACPI-PCI context for parent device %s",
149 acpi_device_bid(device->parent)));
153 data->id.segment = pdata->id.segment;
154 data->id.bus = pdata->bus->number;
159 * These are simply obtained from the device's _ADR method. Note
160 * that a value of zero is valid.
162 data->id.device = device->pnp.bus_address >> 16;
163 data->id.function = device->pnp.bus_address & 0xFFFF;
165 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "...to %04x:%02x:%02x.%d\n",
166 data->id.segment, data->id.bus, data->id.device,
170 * TBD: Support slot devices (e.g. function=0xFFFF).
176 * Locate matching device in PCI namespace. If it doesn't exist
177 * this typically means that the device isn't currently inserted
178 * (e.g. docking station, port replicator, etc.).
179 * We cannot simply search the global pci device list, since
180 * PCI devices are added to the global pci list when the root
181 * bridge start ops are run, which may not have happened yet.
183 bus = pci_find_bus(data->id.segment, data->id.bus);
185 list_for_each_entry(dev, &bus->devices, bus_list) {
186 if (dev->devfn == PCI_DEVFN(data->id.device,
187 data->id.function)) {
194 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
195 "Device %04x:%02x:%02x.%d not present in PCI namespace\n",
196 data->id.segment, data->id.bus,
197 data->id.device, data->id.function));
201 if (!data->dev->bus) {
202 printk(KERN_ERR PREFIX
203 "Device %04x:%02x:%02x.%d has invalid 'bus' field\n",
204 data->id.segment, data->id.bus,
205 data->id.device, data->id.function);
213 * If so, set the 'bus' field and install the 'bind' function to
214 * facilitate callbacks for all of its children.
216 if (data->dev->subordinate) {
217 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
218 "Device %04x:%02x:%02x.%d is a PCI bridge\n",
219 data->id.segment, data->id.bus,
220 data->id.device, data->id.function));
221 data->bus = data->dev->subordinate;
222 device->ops.bind = acpi_pci_bind;
223 device->ops.unbind = acpi_pci_unbind;
227 * Attach ACPI-PCI Context
228 * -----------------------
229 * Thus binding the ACPI and PCI devices.
231 status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
232 if (ACPI_FAILURE(status)) {
233 ACPI_EXCEPTION((AE_INFO, status,
234 "Unable to attach ACPI-PCI context to device %s",
235 acpi_device_bid(device)));
243 * Evaluate and parse _PRT, if exists. This code is independent of
244 * PCI bridges (above) to allow parsing of _PRT objects within the
245 * scope of non-bridge devices. Note that _PRTs within the scope of
246 * a PCI bridge assume the bridge's subordinate bus number.
248 * TBD: Can _PRTs exist within the scope of non-bridge PCI devices?
250 status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
251 if (ACPI_SUCCESS(status)) {
252 if (data->bus) /* PCI-PCI bridge */
253 acpi_pci_irq_add_prt(device->handle, data->id.segment,
255 else /* non-bridge PCI device */
256 acpi_pci_irq_add_prt(device->handle, data->id.segment,
261 kfree(buffer.pointer);
268 static int acpi_pci_unbind(struct acpi_device *device)
272 struct acpi_pci_data *data;
273 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
276 if (!device || !device->parent)
279 status = acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
280 if (ACPI_FAILURE(status))
283 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Unbinding PCI device [%s]...\n",
284 (char *) buffer.pointer));
285 kfree(buffer.pointer);
288 acpi_get_data(device->handle, acpi_pci_data_handler,
290 if (ACPI_FAILURE(status)) {
295 status = acpi_detach_data(device->handle, acpi_pci_data_handler);
296 if (ACPI_FAILURE(status)) {
297 ACPI_EXCEPTION((AE_INFO, status,
298 "Unable to detach data from device %s",
299 acpi_device_bid(device)));
303 if (data->dev->subordinate) {
304 acpi_pci_irq_del_prt(data->id.segment, data->bus->number);
313 acpi_pci_bind_root(struct acpi_device *device,
314 struct acpi_pci_id *id, struct pci_bus *bus)
318 struct acpi_pci_data *data = NULL;
319 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
321 if (!device || !id || !bus) {
325 data = kzalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
331 device->ops.bind = acpi_pci_bind;
332 device->ops.unbind = acpi_pci_unbind;
334 status = acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
335 if (ACPI_FAILURE(status)) {
340 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI root bridge [%s] to "
341 "%04x:%02x\n", (char *)buffer.pointer,
342 id->segment, id->bus));
344 status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
345 if (ACPI_FAILURE(status)) {
346 ACPI_EXCEPTION((AE_INFO, status,
347 "Unable to attach ACPI-PCI context to device %s",
348 (char *)buffer.pointer));
354 kfree(buffer.pointer);