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dm: pci: Add a function to get the controller for a bus

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A PCI bus may be a bridge device where the controller is the bridge's
parent. Add a function to return the controller device, given a PCI device.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
This commit is contained in:
Simon Glass 2015-11-19 20:27:00 -07:00
parent 9289db6c60
commit 9f60fb0db4
2 changed files with 16 additions and 0 deletions
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8
drivers/pci/pci-uclass.c
View File

@ -53,6 +53,14 @@ struct pci_controller *pci_bus_to_hose(int busnum)
return dev_get_uclass_priv(bus);
}
struct udevice *pci_get_controller(struct udevice *dev)
{
while (device_is_on_pci_bus(dev))
dev = dev->parent;
return dev;
}
pci_dev_t pci_get_bdf(struct udevice *dev)
{
struct pci_child_platdata *pplat = dev_get_parent_platdata(dev);

8
include/pci.h
View File

@ -1122,6 +1122,14 @@ ulong pci_conv_32_to_size(ulong value, uint offset, enum pci_size_t size);
ulong pci_conv_size_to_32(ulong old, ulong value, uint offset,
enum pci_size_t size);
/**
* pci_get_controller() - obtain the controller to use for a bus
*
* @dev: Device to check
* @return pointer to the controller device for this bus
*/
struct udevice *pci_get_controller(struct udevice *dev);
/**
* struct dm_pci_emul_ops - PCI device emulator operations
*/