RealView: Fix entry-macro.S to work with multiple platforms

This patch modifies the get_irqnr_preamble macro to work with multiple
platforms at run-time by reading the address of the GIC controller from
the gic_cpu_base_addr variable. This variable is defined in core.c and
intialised in realview_eb.c (gic_init_irq).
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

arch/arm/mach-realview/core.c

@@ -50,6 +50,9 @@
 
 #define REALVIEW_REFCOUNTER	(__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_24MHz_OFFSET)
 
+/* used by entry-macro.S */
+void __iomem *gic_cpu_base_addr;
+
 /*
  * This is the RealView sched_clock implementation.  This has
  * a resolution of 41.7ns, and a maximum value of about 179s.

arch/arm/mach-realview/core.h

@@ -52,6 +52,7 @@ extern struct mmc_platform_data realview_mmc0_plat_data;
 extern struct mmc_platform_data realview_mmc1_plat_data;
 extern struct clk realview_clcd_clk;
 extern struct clcd_board clcd_plat_data;
+extern void __iomem *gic_cpu_base_addr;
 
 extern void realview_leds_event(led_event_t ledevt);
 

arch/arm/mach-realview/realview_eb.c

@@ -256,8 +256,9 @@ static void __init gic_init_irq(void)
 		writel(0x00000000, __io_address(REALVIEW_SYS_LOCK));
 
 		/* core tile GIC, primary */
+		gic_cpu_base_addr = __io_address(REALVIEW_EB11MP_GIC_CPU_BASE);
 		gic_dist_init(0, __io_address(REALVIEW_EB11MP_GIC_DIST_BASE), 29);
-		gic_cpu_init(0, __io_address(REALVIEW_EB11MP_GIC_CPU_BASE));
+		gic_cpu_init(0, gic_cpu_base_addr);
 
 #ifndef CONFIG_REALVIEW_MPCORE_REVB
 		/* board GIC, secondary */
@@ -267,8 +268,9 @@ static void __init gic_init_irq(void)
 #endif
 	} else {
 		/* board GIC, primary */
+		gic_cpu_base_addr = __io_address(REALVIEW_GIC_CPU_BASE);
 		gic_dist_init(0, __io_address(REALVIEW_GIC_DIST_BASE), 29);
-		gic_cpu_init(0, __io_address(REALVIEW_GIC_CPU_BASE));
+		gic_cpu_init(0, gic_cpu_base_addr);
 	}
 }
 

include/asm-arm/arch-realview/entry-macro.S

@@ -9,17 +9,13 @@
  */
 #include <asm/hardware.h>
 #include <asm/hardware/gic.h>
-#include <asm/arch/board-eb.h>
 
 		.macro	disable_fiq
 		.endm
 
 		.macro  get_irqnr_preamble, base, tmp
-#ifdef CONFIG_REALVIEW_MPCORE
-		ldr     \base, =IO_ADDRESS(REALVIEW_EB11MP_GIC_CPU_BASE)
-#else
-		ldr     \base, =IO_ADDRESS(REALVIEW_GIC_CPU_BASE)
-#endif
+		ldr	\base, =gic_cpu_base_addr
+		ldr	\base, [\base]
 		.endm
 
 		.macro  arch_ret_to_user, tmp1, tmp2