From 9b229fa0951fb47cbc178be4bd8e9ef185b38802 Mon Sep 17 00:00:00 2001 From: Catalin Marinas Date: Wed, 4 Nov 2009 12:16:38 +0000 Subject: [PATCH] Check whether the SCU was already initialised If Linux is running in non-secure mode, this register may have been already initialised and writing to the control register not allowed. Signed-off-by: Catalin Marinas --- arch/arm/kernel/smp_scu.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm/kernel/smp_scu.c b/arch/arm/kernel/smp_scu.c index d3831f616ee..9ab4149bd98 100644 --- a/arch/arm/kernel/smp_scu.c +++ b/arch/arm/kernel/smp_scu.c @@ -37,6 +37,10 @@ void __init scu_enable(void __iomem *scu_base) u32 scu_ctrl; scu_ctrl = __raw_readl(scu_base + SCU_CTRL); + /* already enabled? */ + if (scu_ctrl & 1) + return; + scu_ctrl |= 1; __raw_writel(scu_ctrl, scu_base + SCU_CTRL); -- 2.39.5