linux-kernel - [PATCH v2 3/4] GIC: Add callback for mask

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Date:	Thu, 28 Jan 2010 23:06:03 -0800
From:	adharmap@...eaurora.org
To:	linux-arm-kernel@...ts.infradead.org
Cc:	linux-arm-msm@...ts.infradead.org,
	Russell King <linux@....linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>, Yinghai Lu <yinghai@...nel.org>,
	Abhijeet Dharmapurikar <adharmap@...cinc.com>
Subject: [PATCH v2 3/4] GIC: Add callback for mask_ack

From: Abhijeet Dharmapurikar <adharmap@...cinc.com>

Add gic_mask_ack for faster processing of interrupts.

Signed-off-by: Abhijeet Dharmapurikar <adharmap@...cinc.com>
---
 arch/arm/common/gic.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c
index 8a2bfae..240f6b6 100644
--- a/arch/arm/common/gic.c
+++ b/arch/arm/common/gic.c
@@ -108,6 +108,15 @@ static void gic_unmask_irq(unsigned int irq)
 	spin_unlock(&irq_controller_lock);
 }
 
+static void gic_mask_ack_irq(unsigned int irq)
+{
+	u32 mask = 1 << (irq % 32);
+	spin_lock(&irq_controller_lock);
+	writel(mask, gic_dist_base(irq) + GIC_DIST_ENABLE_CLEAR + (gic_irq(irq) / 32) * 4);
+	writel(gic_irq(irq), gic_cpu_base(irq) + GIC_CPU_EOI);
+	spin_unlock(&irq_controller_lock);
+}
+
 #ifdef CONFIG_SMP
 static int gic_set_cpu(unsigned int irq, const struct cpumask *mask_val)
 {
@@ -160,6 +169,7 @@ static struct irq_chip gic_chip = {
 	.name		= "GIC",
 	.ack		= gic_ack_irq,
 	.mask		= gic_mask_irq,
+	.mask_ack	= gic_mask_ack_irq,
 	.unmask		= gic_unmask_irq,
 #ifdef CONFIG_SMP
 	.set_affinity	= gic_set_cpu,
-- 
1.5.6.3

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