[ARM] 4820/1: RealView: Select the timer IRQ at run-time

This patch sets the timer IRQ at run-time by moving the sys_timer
structure and the timer_init function to the realview_eb.c file. This
allows multiple RealView platforms to be compiled in the same kernel
image.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-realview/core.c

@@ -39,7 +39,6 @@
 #include <asm/mach/arch.h>
 #include <asm/mach/flash.h>
 #include <asm/mach/irq.h>
-#include <asm/mach/time.h>
 #include <asm/mach/map.h>
 #include <asm/mach/mmc.h>
 
@@ -513,12 +512,12 @@ static struct clock_event_device timer0_clockevent =	 {
 	.set_mode	= timer_set_mode,
 	.set_next_event	= timer_set_next_event,
 	.rating		= 300,
-	.irq		= IRQ_TIMERINT0_1,
 	.cpumask	= CPU_MASK_ALL,
 };
 
-static void __init realview_clockevents_init(void)
+static void __init realview_clockevents_init(unsigned int timer_irq)
 {
+	timer0_clockevent.irq = timer_irq;
 	timer0_clockevent.mult =
 		div_sc(1000000, NSEC_PER_SEC, timer0_clockevent.shift);
 	timer0_clockevent.max_delta_ns =
@@ -581,7 +580,7 @@ static void __init realview_clocksource_init(void)
 /*
  * Set up the clock source and clock events devices
  */
-static void __init realview_timer_init(void)
+void __init realview_timer_init(unsigned int timer_irq)
 {
 	u32 val;
 
@@ -616,12 +615,8 @@ static void __init realview_timer_init(void)
 	/* 
 	 * Make irqs happen for the system timer
 	 */
-	setup_irq(IRQ_TIMERINT0_1, &realview_timer_irq);
+	setup_irq(timer_irq, &realview_timer_irq);
 
 	realview_clocksource_init();
-	realview_clockevents_init();
+	realview_clockevents_init(timer_irq);
 }
-
-struct sys_timer realview_timer = {
-	.init		= realview_timer_init,
-};

arch/arm/mach-realview/core.h

@@ -27,8 +27,6 @@
 #include <asm/leds.h>
 #include <asm/io.h>
 
-extern struct sys_timer realview_timer;
-
 #define AMBA_DEVICE(name,busid,base,plat)			\
 static struct amba_device name##_device = {			\
 	.dev		= {					\
@@ -55,5 +53,6 @@ extern struct clcd_board clcd_plat_data;
 extern void __iomem *gic_cpu_base_addr;
 
 extern void realview_leds_event(led_event_t ledevt);
+extern void realview_timer_init(unsigned int timer_irq);
 
 #endif

arch/arm/mach-realview/realview_eb.c

@@ -36,6 +36,7 @@
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
 #include <asm/mach/mmc.h>
+#include <asm/mach/time.h>
 
 #include <asm/arch/board-eb.h>
 #include <asm/arch/irqs.h>
@@ -304,6 +305,22 @@ static void realview_eb11mp_fixup(void)
 	realview_eb_smc91x_resources[1].end	= IRQ_EB11MP_ETH;
 }
 
+static void __init realview_eb_timer_init(void)
+{
+	unsigned int timer_irq;
+
+	if (core_tile_eb11mp())
+		timer_irq = IRQ_EB11MP_TIMER0_1;
+	else
+		timer_irq = IRQ_EB_TIMER0_1;
+
+	realview_timer_init(timer_irq);
+}
+
+static struct sys_timer realview_eb_timer = {
+	.init		= realview_eb_timer_init,
+};
+
 static void __init realview_eb_init(void)
 {
 	int i;
@@ -339,6 +356,6 @@ MACHINE_START(REALVIEW_EB, "ARM-RealView EB")
 	.boot_params	= 0x00000100,
 	.map_io		= realview_eb_map_io,
 	.init_irq	= gic_init_irq,
-	.timer		= &realview_timer,
+	.timer		= &realview_eb_timer,
 	.init_machine	= realview_eb_init,
 MACHINE_END