powerpc: Create pci_controller_ops.dma_dev_setup and shim

Introduces the pci_controller_ops structure.
Add pci_controller_ops.dma_dev_setup, shadowing ppc_md.pci_dma_dev_setup.
Add a shim, and change 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

@@ -14,6 +14,13 @@
 
 struct device_node;
 
+/*
+ * PCI controller operations
+ */
+struct pci_controller_ops {
+	void		(*dma_dev_setup)(struct pci_dev *dev);
+};
+
 /*
  * Structure of a PCI controller (host bridge)
  */
@@ -46,6 +53,7 @@ struct pci_controller {
 	resource_size_t	isa_mem_phys;
 	resource_size_t	isa_mem_size;
 
+	struct pci_controller_ops controller_ops;
 	struct pci_ops *ops;
 	unsigned int __iomem *cfg_addr;
 	void __iomem *cfg_data;
@@ -260,5 +268,18 @@ static inline int pcibios_vaddr_is_ioport(void __iomem *address)
 }
 #endif	/* CONFIG_PCI */
 
+/*
+ * Shims to prefer pci_controller version over ppc_md where available.
+ */
+static inline void pci_dma_dev_setup(struct pci_dev *dev)
+{
+	struct pci_controller *phb = pci_bus_to_host(dev->bus);
+
+	if (phb->controller_ops.dma_dev_setup)
+		phb->controller_ops.dma_dev_setup(dev);
+	else if (ppc_md.pci_dma_dev_setup)
+		ppc_md.pci_dma_dev_setup(dev);
+}
+
 #endif	/* __KERNEL__ */
 #endif	/* _ASM_POWERPC_PCI_BRIDGE_H */

arch/powerpc/kernel/pci-common.c

@@ -969,8 +969,7 @@ static void pcibios_setup_device(struct pci_dev *dev)
 	set_dma_offset(&dev->dev, PCI_DRAM_OFFSET);
 
 	/* Additional platform DMA/iommu setup */
-	if (ppc_md.pci_dma_dev_setup)
-		ppc_md.pci_dma_dev_setup(dev);
+	pci_dma_dev_setup(dev);
 
 	/* Read default IRQs and fixup if necessary */
 	pci_read_irq_line(dev);