Rpmsg channel configuration should be identical on host and
coprocessor side.
This patch proposes a new structure named struct virtio_rpmsg_cfg
to gather all configuration information to characterize the
communication link and.
This structure will be exchanged with coprocessor via the resource
table, expanding struct fw_rsc_vdev. It will guarantee that host
and coprocessor will share the same information.
virtio_rpmsg will access it thanks to virtio get and set features.
Presence of struct virtio_rpmsg_cfg is optional.
Signed-off-by: Loic Pallardy <loic.pallardy@xxxxxx>
---
include/linux/rpmsg/virtio_rpmsg.h | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
create mode 100644 include/linux/rpmsg/virtio_rpmsg.h
diff --git a/include/linux/rpmsg/virtio_rpmsg.h b/include/linux/rpmsg/virtio_rpmsg.h
new file mode 100644
index 0000000..5f3f0d0
--- /dev/null
+++ b/include/linux/rpmsg/virtio_rpmsg.h
@@ -0,0 +1,32 @@
+
+#ifndef _LINUX_VIRTIO_RPMSG_H
+#define _LINUX_VIRTIO_RPMSG_H
+
+/* Offset in struct fw_rsc_vdev */
+#define RPMSG_CONFIG_OFFSET 0
+
+/**
+ * struct virtio_rpmsg_cfg - optional configuration field for virtio rpmsg
+ * provided at probe time by virtio (get/set)
+ * @id: virtio cfg id (as in virtio_ids.h)
+ * @version: virtio_rpmsg_cfg structure version number
+ * @va: virtual address (used when buffer allocated by low level driver)
+ * @da: device address
+ * @pa: physical address
+ * @len: length (in bytes)
+ * @buf_size: size of rpmsg buffer size (defined by firmware else default value
+ * used)
+ * @reserved: reserved (must be zero)
+ */
+struct virtio_rpmsg_cfg {
+ u32 id;
+ u32 version;
+ u64 va;
+ u32 da;
+ u32 pa;
+ u32 len;
+ u32 buf_size;
+ u32 reserved;
+} __packed;
+
+#endif
--
1.9.1
--
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