[PATCH 09/10] rpmsg: virtio: Make endianness conversion virtIO specific

[Mathieu Poirier]

Introduce rpmsg operations to make byte conversion specific to the
virtIO transport layer, therefore avoiding the protocol code from
being aware of the virtIO transport specification.

Signed-off-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
---
 drivers/rpmsg/virtio_rpmsg_bus.c | 36 ++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c
index 1c0be0ee790c..15cc383a85cc 100644
--- a/drivers/rpmsg/virtio_rpmsg_bus.c
+++ b/drivers/rpmsg/virtio_rpmsg_bus.c
@@ -157,6 +157,38 @@ static struct rpmsg_endpoint *__rpmsg_create_ept(struct virtproc_info *vrp,
 	return NULL;
 }
 
+static u16 virtio_rpmsg_transport16_to_cpu(struct rpmsg_device *rpdev, u16 val)
+{
+	struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev);
+	struct virtproc_info *vrp = vch->vrp;
+
+	return virtio16_to_cpu(vrp->vdev, val);
+}
+
+static u16 virtio_rpmsg_cpu_to_transport16(struct rpmsg_device *rpdev, u16 val)
+{
+	struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev);
+	struct virtproc_info *vrp = vch->vrp;
+
+	return cpu_to_virtio16(vrp->vdev, val);
+}
+
+static u32 virtio_rpmsg_transport32_to_cpu(struct rpmsg_device *rpdev, u32 val)
+{
+	struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev);
+	struct virtproc_info *vrp = vch->vrp;
+
+	return virtio32_to_cpu(vrp->vdev, val);
+}
+
+static u32 virtio_rpmsg_cpu_to_transport32(struct rpmsg_device *rpdev, u32 val)
+{
+	struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev);
+	struct virtproc_info *vrp = vch->vrp;
+
+	return cpu_to_virtio32(vrp->vdev, val);
+}
+
 static struct rpmsg_device *
 virtio_rpmsg_create_channel(struct rpmsg_device *rpdev,
 			    struct rpmsg_channel_info *chinfo)
@@ -268,6 +300,10 @@ static int virtio_rpmsg_announce_destroy(struct rpmsg_device *rpdev)
 }
 
 static const struct rpmsg_device_ops virtio_rpmsg_ops = {
+	.transport16_to_cpu = virtio_rpmsg_transport16_to_cpu,
+	.cpu_to_transport16 = virtio_rpmsg_cpu_to_transport16,
+	.transport32_to_cpu = virtio_rpmsg_transport32_to_cpu,
+	.cpu_to_transport32 = virtio_rpmsg_cpu_to_transport32,
 	.create_channel = virtio_rpmsg_create_channel,
 	.release_channel = virtio_rpmsg_release_channel,
 	.create_ept = virtio_rpmsg_create_ept,
-- 
2.25.1