linux-kernel - [PATCH V4 14/16] irqchip: crossbar: Introduce centralized check for crossbar write

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Message-ID: <1403766634-18543-15-git-send-email-r.sricharan@ti.com>
Date:	Thu, 26 Jun 2014 12:40:32 +0530
From:	Sricharan R <r.sricharan@...com>
To:	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:	<tony@...mide.com>, <santosh.shilimkar@...com>, <nm@...com>,
	<rnayak@...com>, <linux@....linux.org.uk>, <r.sricharan@...com>,
	<tglx@...utronix.de>, <jason@...edaemon.net>, <joe@...ches.com>
Subject: [PATCH V4 14/16] irqchip: crossbar: Introduce centralized check for crossbar write

From: Nishanth Menon <nm@...com>

This is a basic check to ensure that crossbar register needs to be
written. This ensures that we have a common check which is used in
both map and unmap logic.

Signed-off-by: Nishanth Menon <nm@...com>
Signed-off-by: Sricharan R <r.sricharan@...com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@...com>
---
 drivers/irqchip/irq-crossbar.c |   14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-crossbar.c b/drivers/irqchip/irq-crossbar.c
index c9f068c..83f803b 100644
--- a/drivers/irqchip/irq-crossbar.c
+++ b/drivers/irqchip/irq-crossbar.c
@@ -84,10 +84,20 @@ static inline int allocate_free_irq(int cb_no)
 	return -ENODEV;
 }
 
+static inline bool needs_crossbar_write(irq_hw_number_t hw)
+{
+	if (hw > GIC_IRQ_START)
+		return true;
+
+	return false;
+}
+
 static int crossbar_domain_map(struct irq_domain *d, unsigned int irq,
 			       irq_hw_number_t hw)
 {
-	cb->write(hw - GIC_IRQ_START, cb->irq_map[hw - GIC_IRQ_START]);
+	if (needs_crossbar_write(hw))
+		cb->write(hw - GIC_IRQ_START, cb->irq_map[hw - GIC_IRQ_START]);
+
 	return 0;
 }
 
@@ -106,7 +116,7 @@ static void crossbar_domain_unmap(struct irq_domain *d, unsigned int irq)
 {
 	irq_hw_number_t hw = irq_get_irq_data(irq)->hwirq;
 
-	if (hw > GIC_IRQ_START) {
+	if (needs_crossbar_write(hw)) {
 		cb->irq_map[hw - GIC_IRQ_START] = IRQ_FREE;
 		cb->write(hw - GIC_IRQ_START, cb->safe_map);
 	}
-- 
1.7.9.5

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