MIPS: Netlogic: Add MSI support for XLP

Add MSI chip and MSIX chip definitions.

For MSI, we map the link interrupt to a MSI link IRQ which will
do a second level of dispatch based on the MSI status register.

The MSI chip definitions use the MSI enable register to enable
and disable the MSI irqs.

For MSI-X, we split the 32 available MSI-X vectors across the
four PCIe links (8 each). These PIC interrupts generate an IRQ
per link which uses a second level dispatch as well.

The MSI-X chip definition uses the standard functions to enable
and disable interrupts.

Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Signed-off-by: John Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/6270/

arch/mips/include/asm/mach-netlogic/irq.h

@@ -9,7 +9,8 @@
 #define __ASM_NETLOGIC_IRQ_H
 
 #include <asm/mach-netlogic/multi-node.h>
-#define NR_IRQS			(64 * NLM_NR_NODES)
+#define NLM_IRQS_PER_NODE	1024
+#define NR_IRQS			(NLM_IRQS_PER_NODE * NLM_NR_NODES)
 
 #define MIPS_CPU_IRQ_BASE	0