ARM: 7310/1: integrator: implement sched_clock across all boards

Now that we can select a sched_clock at runtime, let's implement
it for the Integrator AP, default-select the one found in all
other board it for all plat-versatile boards and make the right
clock kick in at runtime.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-integrator/Kconfig

@@ -5,6 +5,7 @@ menu "Integrator Options"
 config ARCH_INTEGRATOR_AP
 	bool "Support Integrator/AP and Integrator/PP2 platforms"
 	select CLKSRC_MMIO
+	select HAVE_SCHED_CLOCK
 	select MIGHT_HAVE_PCI
 	select SERIAL_AMBA_PL010
 	select SERIAL_AMBA_PL010_CONSOLE

arch/arm/mach-integrator/integrator_ap.c

@@ -42,6 +42,7 @@
 #include <asm/setup.h>
 #include <asm/param.h>		/* HZ */
 #include <asm/mach-types.h>
+#include <asm/sched_clock.h>
 
 #include <mach/lm.h>
 
@@ -325,6 +326,11 @@ static void __init ap_init(void)
 
 static unsigned long timer_reload;
 
+static u32 notrace integrator_read_sched_clock(void)
+{
+	return -readl((void __iomem *) TIMER2_VA_BASE + TIMER_VALUE);
+}
+
 static void integrator_clocksource_init(unsigned long inrate)
 {
 	void __iomem *base = (void __iomem *)TIMER2_VA_BASE;
@@ -341,6 +347,7 @@ static void integrator_clocksource_init(unsigned long inrate)
 
 	clocksource_mmio_init(base + TIMER_VALUE, "timer2",
 			rate, 200, 16, clocksource_mmio_readl_down);
+	setup_sched_clock(integrator_read_sched_clock, 16, rate);
 }
 
 static void __iomem * const clkevt_base = (void __iomem *)TIMER1_VA_BASE;

arch/arm/plat-versatile/Kconfig

@@ -11,7 +11,7 @@ config PLAT_VERSATILE_LEDS
 	depends on ARCH_REALVIEW || ARCH_VERSATILE
 
 config PLAT_VERSATILE_SCHED_CLOCK
-	def_bool y if !ARCH_INTEGRATOR_AP
+	def_bool y
 	select HAVE_SCHED_CLOCK
 
 endif