linux-kernel - [RFC PATCH 04/10] MIPS: Octeon: Add a irq_create_of

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Message-Id: <1298408274-20856-5-git-send-email-ddaney@caviumnetworks.com>
Date:	Tue, 22 Feb 2011 12:57:48 -0800
From:	David Daney <ddaney@...iumnetworks.com>
To:	linux-mips@...ux-mips.org, ralf@...ux-mips.org,
	devicetree-discuss@...ts.ozlabs.org, grant.likely@...retlab.ca,
	linux-kernel@...r.kernel.org
Cc:	David Daney <ddaney@...iumnetworks.com>
Subject: [RFC PATCH 04/10] MIPS: Octeon: Add a irq_create_of_mapping() implementation.

This is needed for Octeon to use the Device Tree.

Signed-off-by: David Daney <ddaney@...iumnetworks.com>
---
 arch/mips/cavium-octeon/octeon-irq.c |   25 +++++++++++++++++++++++++
 1 files changed, 25 insertions(+), 0 deletions(-)

diff --git a/arch/mips/cavium-octeon/octeon-irq.c b/arch/mips/cavium-octeon/octeon-irq.c
index b365710..b0a9261 100644
--- a/arch/mips/cavium-octeon/octeon-irq.c
+++ b/arch/mips/cavium-octeon/octeon-irq.c
@@ -8,7 +8,9 @@
 
 #include <linux/interrupt.h>
 #include <linux/bitops.h>
+#include <linux/module.h>
 #include <linux/percpu.h>
+#include <linux/of_irq.h>
 #include <linux/irq.h>
 #include <linux/smp.h>
 
@@ -64,6 +66,29 @@ static void __init octeon_irq_set_ciu_mapping(int irq, int line, int bit,
 	octeon_irq_ciu_to_irq[line][bit] = irq;
 }
 
+/*
+ * irq_create_of_mapping - Hook to resolve OF irq specifier into a Linux irq#
+ *
+ * Octeon irq maps are a pair of indexes.  The first selects either
+ * ciu0 or ciu1, the second is the bit within the ciu register.
+ */
+unsigned int irq_create_of_mapping(struct device_node *controller,
+				   const u32 *intspec, unsigned int intsize)
+{
+	int ciu, bit;
+	unsigned int irq = 0;
+
+	ciu = be32_to_cpup(intspec);
+	bit = be32_to_cpup(intspec + 1);
+
+	if (ciu < 8 && bit < 64)
+		irq = octeon_irq_ciu_to_irq[ciu][bit];
+
+	return irq;
+}
+EXPORT_SYMBOL_GPL(irq_create_of_mapping);
+
+
 static int octeon_coreid_for_cpu(int cpu)
 {
 #ifdef CONFIG_SMP
-- 
1.7.2.3

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