ARM: pci: add ->add_bus() and ->remove_bus() hooks to hw_pci

Some PCI drivers may need to adjust the pci_bus structure after it has
been allocated by the Linux PCI core. The PCI core allows
architectures to implement the pcibios_add_bus() and
pcibios_remove_bus() for this purpose. This commit therefore extends
the hw_pci and pci_sys_data structures of the ARM PCI core to allow
PCI drivers to register ->add_bus() and ->remove_bus() in hw_pci,
which will get called when a bus is added or removed from the system.

This will be used for example by the Marvell PCIe driver to connect a
particular PCI bus with its corresponding MSI chip to handle Message
Signaled Interrupts.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Thierry Reding <thierry.reding@gmail.com>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Tested-by: Daniel Price <daniel.price@gmail.com>
Tested-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/arm/include/asm/mach/pci.h b/arch/arm/include/asm/mach/pci.h
index a1c90d7feb0e..454d642a4070 100644
--- a/arch/arm/include/asm/mach/pci.h
+++ b/arch/arm/include/asm/mach/pci.h
@@ -36,6 +36,8 @@ struct hw_pci {
                                           resource_size_t start,
                                           resource_size_t size,
                                           resource_size_t align);
+        void            (*add_bus)(struct pci_bus *bus);
+        void            (*remove_bus)(struct pci_bus *bus);
 };
 
 /*
@@ -63,6 +65,8 @@ struct pci_sys_data {
                                           resource_size_t start,
                                           resource_size_t size,
                                           resource_size_t align);
+        void            (*add_bus)(struct pci_bus *bus);
+        void            (*remove_bus)(struct pci_bus *bus);
         void            *private_data;  /* platform controller private data     */
 };