MIPS: Netlogic: USB support for XLP

The XLP USB controller appears as a device on the internal SoC PCIe
bus, the block has 2 EHCI blocks and 4 OHCI blocks. Change are to:

* Add files netlogic/xlp/usb-init.c and asm/netlogic/xlp-hal/usb.h
  to initialize the USB controller and define PCI fixups. The PCI
  fixups are to setup interrupts and DMA mask.
* Update include/asm/xlp-hal/{iomap.h,pic.h,xlp.h} to add interrupt
  mapping for EHCI/OHCI interrupts.

Signed-off-by: Ganesan Ramalingam <ganesanr@netlogicmicro.com>
Signed-off-by: Jayachandran C <jayachandranc@netlogicmicro.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3756/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/netlogic/xlp/nlm_hal.c

@@ -77,6 +77,18 @@ int nlm_irq_to_irt(int irq)
 	       return PIC_IRT_PCIE_LINK_2_INDEX;
 	case PIC_PCIE_LINK_3_IRQ:
 	       return PIC_IRT_PCIE_LINK_3_INDEX;
+	case PIC_EHCI_0_IRQ:
+	       return PIC_IRT_EHCI_0_INDEX;
+	case PIC_EHCI_1_IRQ:
+	       return PIC_IRT_EHCI_1_INDEX;
+	case PIC_OHCI_0_IRQ:
+	       return PIC_IRT_OHCI_0_INDEX;
+	case PIC_OHCI_1_IRQ:
+	       return PIC_IRT_OHCI_1_INDEX;
+	case PIC_OHCI_2_IRQ:
+	       return PIC_IRT_OHCI_2_INDEX;
+	case PIC_OHCI_3_IRQ:
+	       return PIC_IRT_OHCI_3_INDEX;
 	default:
 		return -1;
 	}
@@ -97,6 +109,18 @@ int nlm_irt_to_irq(int irt)
 	       return PIC_PCIE_LINK_2_IRQ;
 	case PIC_IRT_PCIE_LINK_3_INDEX:
 	       return PIC_PCIE_LINK_3_IRQ;
+	case PIC_IRT_EHCI_0_INDEX:
+		return PIC_EHCI_0_IRQ;
+	case PIC_IRT_EHCI_1_INDEX:
+		return PIC_EHCI_1_IRQ;
+	case PIC_IRT_OHCI_0_INDEX:
+		return PIC_OHCI_0_IRQ;
+	case PIC_IRT_OHCI_1_INDEX:
+		return PIC_OHCI_1_IRQ;
+	case PIC_IRT_OHCI_2_INDEX:
+		return PIC_OHCI_2_IRQ;
+	case PIC_IRT_OHCI_3_INDEX:
+		return PIC_OHCI_3_IRQ;
 	default:
 		return -1;
 	}