PCI: iproc: Allow override of device tree IRQ mapping function

The iProc core PCIe driver defaults to using of_irq_parse_and_map_pci() for
IRQ mapping.  Add iproc_pcie.map_irq so bus interfaces that don't use
device tree can override this by supplying their own IRQ mapping function.

[bhelgaas: changelog]
Posting: http://lkml.kernel.org/r/1431465781-10753-1-git-send-email-hauke@hauke-m.de
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Ray Jui <rjui@broadcom.com.com>

drivers/pci/host/pcie-iproc-platform.c

@@ -71,6 +71,8 @@ static int iproc_pcie_pltfm_probe(struct platform_device *pdev)
 
 	pcie->resources = &res;
 
+	pcie->map_irq = of_irq_parse_and_map_pci;
+
 	ret = iproc_pcie_setup(pcie);
 	if (ret) {
 		dev_err(pcie->dev, "PCIe controller setup failed\n");

drivers/pci/host/pcie-iproc.c

@@ -229,7 +229,7 @@ int iproc_pcie_setup(struct iproc_pcie *pcie)
 
 	pci_scan_child_bus(bus);
 	pci_assign_unassigned_bus_resources(bus);
-	pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci);
+	pci_fixup_irqs(pci_common_swizzle, pcie->map_irq);
 	pci_bus_add_devices(bus);
 
 	return 0;

drivers/pci/host/pcie-iproc.h

@@ -34,6 +34,7 @@ struct iproc_pcie {
 	struct pci_bus *root_bus;
 	struct phy *phy;
 	int irqs[IPROC_PCIE_MAX_NUM_IRQS];
+	int (*map_irq)(const struct pci_dev *, u8, u8);
 };
 
 int iproc_pcie_setup(struct iproc_pcie *pcie);