ARM: 6218/1: Versatile Express: add support for local timers on CA9X4 daughterboard

This patch adds support for the Cortex-A9 local timers available when
using the CA9X4 daughterboard with the Versatile Express.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/Kconfig

@@ -1172,9 +1172,10 @@ config HOTPLUG_CPU
 config LOCAL_TIMERS
 	bool "Use local timer interrupts"
 	depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
-		REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
+		REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || \
+		ARCH_U8500 || ARCH_VEXPRESS_CA9X4)
 	default y
-	select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
+	select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_VEXPRESS || ARCH_OMAP4 || ARCH_U8500)
 	help
 	  Enable support for local timers on SMP platforms, rather then the
 	  legacy IPI broadcast method.  Local timers allows the system

arch/arm/mach-vexpress/ct-ca9x4.c

@@ -16,6 +16,7 @@
 #include <asm/hardware/gic.h>
 #include <asm/mach-types.h>
 #include <asm/pmu.h>
+#include <asm/smp_twd.h>
 
 #include <mach/clkdev.h>
 #include <mach/ct-ca9x4.h>
@@ -53,6 +54,7 @@ static struct map_desc ct_ca9x4_io_desc[] __initdata = {
 
 static void __init ct_ca9x4_map_io(void)
 {
+	twd_base = MMIO_P2V(A9_MPCORE_TWD);
 	v2m_map_io(ct_ca9x4_io_desc, ARRAY_SIZE(ct_ca9x4_io_desc));
 }
 

arch/arm/mach-vexpress/include/mach/ct-ca9x4.h

@@ -28,6 +28,7 @@
 #define A9_MPCORE_SCU		(CT_CA9X4_MPIC + 0x0000)
 #define A9_MPCORE_GIC_CPU	(CT_CA9X4_MPIC + 0x0100)
 #define A9_MPCORE_GIT		(CT_CA9X4_MPIC + 0x0200)
+#define A9_MPCORE_TWD		(CT_CA9X4_MPIC + 0x0600)
 #define A9_MPCORE_GIC_DIST	(CT_CA9X4_MPIC + 0x1000)
 
 /*