powerpc: Create pci_controller_ops.enable_device_hook and shim

Add pci_controller_ops.enable_device_hook,
shadowing ppc_md.pcibios_enable_device_hook.
Add a shim, and changes the callsites to use the shim.

Signed-off-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/pci-bridge.h

@@ -27,6 +27,10 @@ struct pci_controller_ops {
 	void		(*dma_bus_setup)(struct pci_bus *bus);
 
 	int		(*probe_mode)(struct pci_bus *);
+
+	/* Called when pci_enable_device() is called. Returns true to
+	 * allow assignment/enabling of the device. */
+	bool		(*enable_device_hook)(struct pci_dev *);
 };
 
 /*
@@ -310,5 +314,16 @@ static inline int pci_probe_mode(struct pci_bus *bus)
 	return PCI_PROBE_NORMAL;
 }
 
+static inline bool pcibios_enable_device_hook(struct pci_dev *dev)
+{
+	struct pci_controller *phb = pci_bus_to_host(dev->bus);
+
+	if (phb->controller_ops.enable_device_hook)
+		return phb->controller_ops.enable_device_hook(dev);
+	if (ppc_md.pcibios_enable_device_hook)
+		return ppc_md.pcibios_enable_device_hook(dev);
+	return true;
+}
+
 #endif	/* __KERNEL__ */
 #endif	/* _ASM_POWERPC_PCI_BRIDGE_H */

arch/powerpc/kernel/pci-common.c

@@ -1448,9 +1448,8 @@ EXPORT_SYMBOL_GPL(pcibios_finish_adding_to_bus);
 
 int pcibios_enable_device(struct pci_dev *dev, int mask)
 {
-	if (ppc_md.pcibios_enable_device_hook)
-		if (!ppc_md.pcibios_enable_device_hook(dev))
-			return -EINVAL;
+	if (!pcibios_enable_device_hook(dev))
+		return -EINVAL;
 
 	return pci_enable_resources(dev, mask);
 }