From: Catalin Marinas <catalin.marinas@arm.com>
Date: Mon, 18 May 2009 15:26:27 +0000 (+0100)
Subject: [ARM] 5516/1: Flush the D-cache after initialising the SCU
X-Git-Tag: v2.6.31-rc1~344^2~19^2~1
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=af73110d23fb54f940197d93a410e9fa0cee66e2;p=~shefty%2Frdma-dev.git

[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 7f24ee9d733..d3831f616ee 100644
--- 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();
 }