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path: root/drivers/pci/pci-acpi.c
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Diffstat (limited to 'drivers/pci/pci-acpi.c')
-rw-r--r--drivers/pci/pci-acpi.c57
1 files changed, 54 insertions, 3 deletions
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index bc01d34e2634..f94c86fbc669 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -1,9 +1,10 @@
1/* 1/*
2 * File: pci-acpi.c 2 * File: pci-acpi.c
3 * Purpose: Provide PCI supports in ACPI 3 * Purpose: Provide PCI support in ACPI
4 * 4 *
5 * Copyright (C) 2004 Intel 5 * Copyright (C) 2005 David Shaohua Li <shaohua.li@intel.com>
6 * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com) 6 * Copyright (C) 2004 Tom Long Nguyen <tom.l.nguyen@intel.com>
7 * Copyright (C) 2004 Intel Corp.
7 */ 8 */
8 9
9#include <linux/delay.h> 10#include <linux/delay.h>
@@ -207,3 +208,53 @@ acpi_status pci_osc_control_set(u32 flags)
207 return status; 208 return status;
208} 209}
209EXPORT_SYMBOL(pci_osc_control_set); 210EXPORT_SYMBOL(pci_osc_control_set);
211
212/* ACPI bus type */
213static int pci_acpi_find_device(struct device *dev, acpi_handle *handle)
214{
215 struct pci_dev * pci_dev;
216 acpi_integer addr;
217
218 pci_dev = to_pci_dev(dev);
219 /* Please ref to ACPI spec for the syntax of _ADR */
220 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
221 *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
222 if (!*handle)
223 return -ENODEV;
224 return 0;
225}
226
227static int pci_acpi_find_root_bridge(struct device *dev, acpi_handle *handle)
228{
229 int num;
230 unsigned int seg, bus;
231
232 /*
233 * The string should be the same as root bridge's name
234 * Please look at 'pci_scan_bus_parented'
235 */
236 num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus);
237 if (num != 2)
238 return -ENODEV;
239 *handle = acpi_get_pci_rootbridge_handle(seg, bus);
240 if (!*handle)
241 return -ENODEV;
242 return 0;
243}
244
245static struct acpi_bus_type pci_acpi_bus = {
246 .bus = &pci_bus_type,
247 .find_device = pci_acpi_find_device,
248 .find_bridge = pci_acpi_find_root_bridge,
249};
250
251static int __init pci_acpi_init(void)
252{
253 int ret;
254
255 ret = register_acpi_bus_type(&pci_acpi_bus);
256 if (ret)
257 return 0;
258 return 0;
259}
260arch_initcall(pci_acpi_init);