linux-kernel - [PATCH V3 14/17] irqchip/gic: Add helper function for configuring a GIC via device-tree

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Message-ID: <1462379130-11742-15-git-send-email-jonathanh@nvidia.com>
Date:	Wed, 4 May 2016 17:25:27 +0100
From:	Jon Hunter <jonathanh@...dia.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <marc.zyngier@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>
CC:	Kevin Hilman <khilman@...nel.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Grygorii Strashko <grygorii.strashko@...com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Linus Walleij <linus.walleij@...aro.org>,
	<linux-tegra@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Jon Hunter <jonathanh@...dia.com>
Subject: [PATCH V3 14/17] irqchip/gic: Add helper function for configuring a GIC via device-tree

Move the code that configures a GIC via device-tree into it's own
function. This will allow us to re-use this function when adding a
platform driver to support GICs that require power-management.

Signed-off-by: Jon Hunter <jonathanh@...dia.com>
---
 drivers/irqchip/irq-gic.c | 37 +++++++++++++++++++++++++------------
 1 file changed, 25 insertions(+), 12 deletions(-)

diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index a10274926690..2fc5018d6eb9 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -1194,6 +1194,28 @@ static bool gic_check_eoimode(struct device_node *node, void __iomem **base)
 	return true;
 }
 
+static int gic_of_setup(struct device_node *node, void __iomem **dist_base,
+			void __iomem **cpu_base, u32 *percpu_offset)
+{
+	if (!node || !dist_base || !cpu_base || !percpu_offset)
+		return -EINVAL;
+
+	*dist_base = of_iomap(node, 0);
+	if (WARN(!*dist_base, "unable to map gic dist registers\n"))
+		return -ENOMEM;
+
+	*cpu_base = of_iomap(node, 1);
+	if (WARN(!*cpu_base, "unable to map gic cpu registers\n")) {
+		iounmap(*dist_base);
+		return -ENOMEM;
+	}
+
+	if (of_property_read_u32(node, "cpu-offset", percpu_offset))
+		*percpu_offset = 0;
+
+	return 0;
+}
+
 int __init
 gic_of_init(struct device_node *node, struct device_node *parent)
 {
@@ -1214,15 +1236,9 @@ gic_of_init(struct device_node *node, struct device_node *parent)
 	    of_property_read_bool(node, "power-domains"))
 		return 0;
 
-	dist_base = of_iomap(node, 0);
-	if (WARN(!dist_base, "unable to map gic dist registers\n"))
-		return -ENOMEM;
-
-	cpu_base = of_iomap(node, 1);
-	if (WARN(!cpu_base, "unable to map gic cpu registers\n")) {
-		iounmap(dist_base);
-		return -ENOMEM;
-	}
+	ret = gic_of_setup(node, &dist_base, &cpu_base, &percpu_offset);
+	if (ret)
+		return ret;
 
 	/*
 	 * Disable split EOI/Deactivate if either HYP is not available
@@ -1231,9 +1247,6 @@ gic_of_init(struct device_node *node, struct device_node *parent)
 	if (gic_cnt == 0 && !gic_check_eoimode(node, &cpu_base))
 		static_key_slow_dec(&supports_deactivate);
 
-	if (of_property_read_u32(node, "cpu-offset", &percpu_offset))
-		percpu_offset = 0;
-
 	ret = __gic_init_bases(gic_cnt, -1, dist_base, cpu_base, percpu_offset,
 			 &node->fwnode);
 	if (ret) {
-- 
2.1.4