diff options
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/setup-bus.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index 802f56be2149..e3e17f3c0f0f 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -646,6 +646,41 @@ void pci_setup_bridge(struct pci_bus *bus) __pci_setup_bridge(bus, type); } + +int pci_claim_bridge_resource(struct pci_dev *bridge, int i) +{ + if (i < PCI_BRIDGE_RESOURCES || i > PCI_BRIDGE_RESOURCE_END) + return 0; + + if (pci_claim_resource(bridge, i) == 0) + return 0; /* claimed the window */ + + if ((bridge->class >> 8) != PCI_CLASS_BRIDGE_PCI) + return 0; + + if (!pci_bus_clip_resource(bridge, i)) + return -EINVAL; /* clipping didn't change anything */ + + switch (i - PCI_BRIDGE_RESOURCES) { + case 0: + pci_setup_bridge_io(bridge); + break; + case 1: + pci_setup_bridge_mmio(bridge); + break; + case 2: + pci_setup_bridge_mmio_pref(bridge); + break; + default: + return -EINVAL; + } + + if (pci_claim_resource(bridge, i) == 0) + return 0; /* claimed a smaller window */ + + return -EINVAL; +} + /* Check whether the bridge supports optional I/O and prefetchable memory ranges. If not, the respective base/limit registers must be read-only and read as 0. */ |