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Commit 9d981ea5 authored by Thomas Petazzoni's avatar Thomas Petazzoni Committed by Jason Cooper
Browse files

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: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: default avatarThierry Reding <thierry.reding@gmail.com>
Acked-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
Tested-by: default avatarDaniel Price <daniel.price@gmail.com>
Tested-by: default avatarThierry Reding <thierry.reding@gmail.com>
Signed-off-by: default avatarJason Cooper <jason@lakedaemon.net>
parent 0d5a6db3

arch/arm/include/asm/mach/pci.h

+4 −0
Original line number Diff line number Diff line
@@ -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	*/

};

arch/arm/kernel/bios32.c

+16 −0
Original line number Diff line number Diff line
@@ -363,6 +363,20 @@ void pcibios_fixup_bus(struct pci_bus *bus) 
}

EXPORT_SYMBOL(pcibios_fixup_bus);



void pcibios_add_bus(struct pci_bus *bus)

{

	struct pci_sys_data *sys = bus->sysdata;

	if (sys->add_bus)

		sys->add_bus(bus);

}



void pcibios_remove_bus(struct pci_bus *bus)

{

	struct pci_sys_data *sys = bus->sysdata;

	if (sys->remove_bus)

		sys->remove_bus(bus);

}



/*

 * Swizzle the device pin each time we cross a bridge.  If a platform does

 * not provide a swizzle function, we perform the standard PCI swizzling.
@@ -464,6 +478,8 @@ static void pcibios_init_hw(struct device *parent, struct hw_pci *hw, 
		sys->swizzle = hw->swizzle;

		sys->map_irq = hw->map_irq;

		sys->align_resource = hw->align_resource;

		sys->add_bus = hw->add_bus;

		sys->remove_bus = hw->remove_bus;

		INIT_LIST_HEAD(&sys->resources);



		if (hw->private_data)