RealView: Move the SCU initialisation out of __v6_setup

This patch moves the SCU initialisation from __v6_setup to the
smp_prepare_cpus() function as it relies on platform-specific
settings. Changes to get_core_count() are mainly for allowing cleaner
code with the upcoming PB11MPCore patches.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

1 files changed, 35 insertions, 8 deletions

diff --git a/arch/arm/mach-realview/platsmp.c b/arch/arm/mach-realview/platsmp.c
index de2b7159557d..2ff1acaf2be7 100644
--- a/arch/arm/mach-realview/platsmp.c
+++ b/arch/arm/mach-realview/platsmp.c
@@ -15,11 +15,13 @@
 #include <linux/smp.h>
 
 #include <asm/cacheflush.h>
-#include <asm/hardware/arm_scu.h>
 #include <asm/hardware.h>
 #include <asm/io.h>
 #include <asm/mach-types.h>
 
+#include <asm/arch/board-eb.h>
+#include <asm/arch/scu.h>
+
 extern void realview_secondary_startup(void);
 
 /*
@@ -31,9 +33,13 @@ volatile int __cpuinitdata pen_release = -1;
 static unsigned int __init get_core_count(void)
 {
 	unsigned int ncores;
+	void __iomem *scu_base = 0;
+
+	if (machine_is_realview_eb() && core_tile_eb11mp())
+		scu_base = __io_address(REALVIEW_EB11MP_SCU_BASE);
 
-	if (machine_is_realview_eb() && core_tile_eb11mp()) {
-		ncores = __raw_readl(__io_address(REALVIEW_EB11MP_SCU_BASE) + SCU_CONFIG);
+	if (scu_base) {
+		ncores = __raw_readl(scu_base + SCU_CONFIG);
 		ncores = (ncores & 0x03) + 1;
 	} else
 		ncores = 1;
@@ -41,6 +47,24 @@ static unsigned int __init get_core_count(void)
 	return ncores;
 }
 
+/*
+ * Setup the SCU
+ */
+static void scu_enable(void)
+{
+	u32 scu_ctrl;
+	void __iomem *scu_base;
+
+	if (machine_is_realview_eb() && core_tile_eb11mp())
+		scu_base = __io_address(REALVIEW_EB11MP_SCU_BASE);
+	else
+		BUG();
+
+	scu_ctrl = __raw_readl(scu_base + SCU_CTRL);
+	scu_ctrl |= 1;
+	__raw_writel(scu_ctrl, scu_base + SCU_CTRL);
+}
+
 static DEFINE_SPINLOCK(boot_lock);
 
 void __cpuinit platform_secondary_init(unsigned int cpu)
@@ -210,11 +234,14 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
 		cpu_set(i, cpu_present_map);
 
 	/*
-	 * Do we need any more CPUs? If so, then let them know where
-	 * to start. Note that, on modern versions of MILO, the "poke"
-	 * doesn't actually do anything until each individual core is
-	 * sent a soft interrupt to get it out of WFI
+	 * Initialise the SCU if there are more than one CPU and let
+	 * them know where to start. Note that, on modern versions of
+	 * MILO, the "poke" doesn't actually do anything until each
+	 * individual core is sent a soft interrupt to get it out of
+	 * WFI
 	 */
-	if (max_cpus > 1)
+	if (max_cpus > 1) {
+		scu_enable();
 		poke_milo();
+	}
 }