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authorMarc Zyngier <marc.zyngier@arm.com>2015-10-01 19:05:45 +0300
committerMarc Zyngier <marc.zyngier@arm.com>2015-10-16 15:07:15 +0300
commita251b263346e38b9fafebeb49ada9ce894882616 (patch)
treef9b28b1a854cd1e64ef4289503b3363fef9d85fd /drivers/of
parentdeac7fc1c87f24099d7e15d8b662446497f57465 (diff)
downloadlinux-a251b263346e38b9fafebeb49ada9ce894882616.tar.xz
of/irq: Split of_msi_map_rid to reuse msi-map lookup
The msi-map property is also used to identify the MSI controller as a form of grown-up msi-parent property. Looking it up is complicated enough, and since of_msi_map_rid already implements this, let's turn it into an internal utility function. We'll put that to good use later on. Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'drivers/of')
-rw-r--r--drivers/of/irq.c43
1 files changed, 28 insertions, 15 deletions
diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index 89ebc612293d..ed64d98807f9 100644
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -579,21 +579,12 @@ err:
}
}
-/**
- * of_msi_map_rid - Map a MSI requester ID for a device.
- * @dev: device for which the mapping is to be done.
- * @msi_np: device node of the expected msi controller.
- * @rid_in: unmapped MSI requester ID for the device.
- *
- * Walk up the device hierarchy looking for devices with a "msi-map"
- * property. If found, apply the mapping to @rid_in.
- *
- * Returns the mapped MSI requester ID.
- */
-u32 of_msi_map_rid(struct device *dev, struct device_node *msi_np, u32 rid_in)
+static u32 __of_msi_map_rid(struct device *dev, struct device_node **np,
+ u32 rid_in)
{
struct device *parent_dev;
struct device_node *msi_controller_node;
+ struct device_node *msi_np = *np;
u32 map_mask, masked_rid, rid_base, msi_base, rid_len, phandle;
int msi_map_len;
bool matched;
@@ -643,9 +634,15 @@ u32 of_msi_map_rid(struct device *dev, struct device_node *msi_np, u32 rid_in)
msi_controller_node = of_find_node_by_phandle(phandle);
- matched = masked_rid >= rid_base &&
- masked_rid < rid_base + rid_len &&
- msi_np == msi_controller_node;
+ matched = (masked_rid >= rid_base &&
+ masked_rid < rid_base + rid_len);
+ if (msi_np)
+ matched &= msi_np == msi_controller_node;
+
+ if (matched && !msi_np) {
+ *np = msi_np = msi_controller_node;
+ break;
+ }
of_node_put(msi_controller_node);
msi_map_len -= 4 * sizeof(__be32);
@@ -663,6 +660,22 @@ u32 of_msi_map_rid(struct device *dev, struct device_node *msi_np, u32 rid_in)
return rid_out;
}
+/**
+ * of_msi_map_rid - Map a MSI requester ID for a device.
+ * @dev: device for which the mapping is to be done.
+ * @msi_np: device node of the expected msi controller.
+ * @rid_in: unmapped MSI requester ID for the device.
+ *
+ * Walk up the device hierarchy looking for devices with a "msi-map"
+ * property. If found, apply the mapping to @rid_in.
+ *
+ * Returns the mapped MSI requester ID.
+ */
+u32 of_msi_map_rid(struct device *dev, struct device_node *msi_np, u32 rid_in)
+{
+ return __of_msi_map_rid(dev, &msi_np, rid_in);
+}
+
static struct irq_domain *__of_get_msi_domain(struct device_node *np,
enum irq_domain_bus_token token)
{