MIPS: BCM47XX: add vectored interrupt support

This adds support for vectored interrupt which is supported by the SoC
using a MIPS 74K CPU like the BCM4716 and BCM4706.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: John Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/6290/

arch/mips/bcm47xx/Kconfig

@@ -21,6 +21,7 @@ config BCM47XX_SSB
 config BCM47XX_BCMA
 	bool "BCMA Support for Broadcom BCM47XX"
 	select SYS_HAS_CPU_MIPS32_R2
+	select CPU_MIPSR2_IRQ_VI
 	select BCMA
 	select BCMA_HOST_SOC
 	select BCMA_DRIVER_MIPS

arch/mips/bcm47xx/irq.c

@@ -25,6 +25,7 @@
 #include <linux/types.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
+#include <asm/setup.h>
 #include <asm/irq_cpu.h>
 #include <bcm47xx.h>
 
@@ -50,6 +51,18 @@ asmlinkage void plat_irq_dispatch(void)
 		do_IRQ(6);
 }
 
+#define DEFINE_HWx_IRQDISPATCH(x)					\
+	static void bcm47xx_hw ## x ## _irqdispatch(void)		\
+	{								\
+		do_IRQ(x);						\
+	}
+DEFINE_HWx_IRQDISPATCH(2)
+DEFINE_HWx_IRQDISPATCH(3)
+DEFINE_HWx_IRQDISPATCH(4)
+DEFINE_HWx_IRQDISPATCH(5)
+DEFINE_HWx_IRQDISPATCH(6)
+DEFINE_HWx_IRQDISPATCH(7)
+
 void __init arch_init_irq(void)
 {
 #ifdef CONFIG_BCM47XX_BCMA
@@ -64,4 +77,14 @@ void __init arch_init_irq(void)
 	}
 #endif
 	mips_cpu_irq_init();
+
+	if (cpu_has_vint) {
+		pr_info("Setting up vectored interrupts\n");
+		set_vi_handler(2, bcm47xx_hw2_irqdispatch);
+		set_vi_handler(3, bcm47xx_hw3_irqdispatch);
+		set_vi_handler(4, bcm47xx_hw4_irqdispatch);
+		set_vi_handler(5, bcm47xx_hw5_irqdispatch);
+		set_vi_handler(6, bcm47xx_hw6_irqdispatch);
+		set_vi_handler(7, bcm47xx_hw7_irqdispatch);
+	}
 }