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Subject[PATCH V3 14/17] irqchip/gic: Add helper function for configuring a GIC via device-tree
Date
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@nvidia.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
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