prd: Implement firmware side of opaque PRD channel

This change introduces the firmware side of the opaque HBRT <--> OPAL
message channel. We define a base message format to be shared with HBRT
(in include/prd-fw-msg.h), and allow firmware requests and responses to
be sent over this channel.

We don't currently have any notifications defined, so have nothing to do
for firmware_notify() at this stage.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
CC: Daniel M Crowell <dcrowell@us.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

1 files changed, 37 insertions, 0 deletions

diff --git a/include/prd-fw-msg.h b/include/prd-fw-msg.h
new file mode 100644
index 00000000..c00405dd
--- /dev/null
+++ b/include/prd-fw-msg.h
@@ -0,0 +1,37 @@
+/* Copyright 2017 IBM Corp.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *	http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ * implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+#ifndef __PRD_FW_MSG_H
+#define __PRD_FW_MSG_H
+
+#include <types.h>
+
+/* Messaging structure for the opaque channel between OPAL and HBRT. This
+ * format is used for the firmware_request and firmware_notify interfaces
+ */
+enum {
+	PRD_FW_MSG_TYPE_REQ_NOP = 0,
+	PRD_FW_MSG_TYPE_RESP_NOP = 1,
+};
+
+struct prd_fw_msg {
+	__be64		type;
+};
+
+#define PRD_FW_MSG_BASE_SIZE	sizeof(__be64)
+
+#endif /* __PRD_FW_MSG_H */