diff options
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pci-acpi.c | 57 |
1 files changed, 54 insertions, 3 deletions
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c index bc01d34..f94c86f 100644 --- a/drivers/pci/pci-acpi.c +++ b/drivers/pci/pci-acpi.c @@ -1,9 +1,10 @@ /* * File: pci-acpi.c - * Purpose: Provide PCI supports in ACPI + * Purpose: Provide PCI support in ACPI * - * Copyright (C) 2004 Intel - * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com) + * Copyright (C) 2005 David Shaohua Li <shaohua.li@intel.com> + * Copyright (C) 2004 Tom Long Nguyen <tom.l.nguyen@intel.com> + * Copyright (C) 2004 Intel Corp. */ #include <linux/delay.h> @@ -207,3 +208,53 @@ acpi_status pci_osc_control_set(u32 flags) return status; } EXPORT_SYMBOL(pci_osc_control_set); + +/* ACPI bus type */ +static int pci_acpi_find_device(struct device *dev, acpi_handle *handle) +{ + struct pci_dev * pci_dev; + acpi_integer addr; + + pci_dev = to_pci_dev(dev); + /* Please ref to ACPI spec for the syntax of _ADR */ + addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn); + *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr); + if (!*handle) + return -ENODEV; + return 0; +} + +static int pci_acpi_find_root_bridge(struct device *dev, acpi_handle *handle) +{ + int num; + unsigned int seg, bus; + + /* + * The string should be the same as root bridge's name + * Please look at 'pci_scan_bus_parented' + */ + num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus); + if (num != 2) + return -ENODEV; + *handle = acpi_get_pci_rootbridge_handle(seg, bus); + if (!*handle) + return -ENODEV; + return 0; +} + +static struct acpi_bus_type pci_acpi_bus = { + .bus = &pci_bus_type, + .find_device = pci_acpi_find_device, + .find_bridge = pci_acpi_find_root_bridge, +}; + +static int __init pci_acpi_init(void) +{ + int ret; + + ret = register_acpi_bus_type(&pci_acpi_bus); + if (ret) + return 0; + return 0; +} +arch_initcall(pci_acpi_init); |