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>

2 files changed, 20 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     */
 };
 
diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c
index 261fcc826169..1ec9c8701c26 100644
--- a/arch/arm/kernel/bios32.c
+++ b/arch/arm/kernel/bios32.c
@@ -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)