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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>
This commit is contained in:
Thomas Petazzoni 2013-08-09 22:27:12 +02:00 committed by Jason Cooper
parent 0d5a6db3aa
commit 9d981ea5d4
2 changed files with 20 additions and 0 deletions
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4
arch/arm/include/asm/mach/pci.h
View File

@ -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 */
};

16
arch/arm/kernel/bios32.c
View File

@ -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)