[ARM] 5516/1: Flush the D-cache after initialising the SCU

On MP systems, the data loaded by CPU0 before the SCU was initialised
may not be visible to the other CPUs.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This also includes the following compile fix:

This patch includes 'asm/cacheflush.h' which is needed to use
'flush_cache_all()' function.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/kernel/smp_scu.c b/arch/arm/kernel/smp_scu.c
index 7f24ee9..d3831f6 100644 (file)
--- a/arch/arm/kernel/smp_scu.c
+++ b/arch/arm/kernel/smp_scu.c
@@ -12,6 +12,7 @@
 #include <linux/io.h>
 
 #include <asm/smp_scu.h>
+#include <asm/cacheflush.h>
 
 #define SCU_CTRL               0x00
 #define SCU_CONFIG             0x04
@@ -38,4 +39,10 @@ void __init scu_enable(void __iomem *scu_base)
        scu_ctrl = __raw_readl(scu_base + SCU_CTRL);
        scu_ctrl |= 1;
        __raw_writel(scu_ctrl, scu_base + SCU_CTRL);
+
+       /*
+        * Ensure that the data accessed by CPU0 before the SCU was
+        * initialised is visible to the other CPUs.
+        */
+       flush_cache_all();
 }