test: ipc: Add FW testing IPC foundations.

Add a new IPC global class for FW testing alongside the first "test" IPC
command for flooding the DSP with IPCs.

Needs to have CONFIG_DEBUG enabled.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Author: lrgirdwo

src/include/uapi/ipc/header.h

@@ -93,6 +93,7 @@
 #define SOF_IPC_GLB_DAI_MSG			SOF_GLB_TYPE(0x8U)
 #define SOF_IPC_GLB_TRACE_MSG			SOF_GLB_TYPE(0x9U)
 #define SOF_IPC_GLB_GDB_DEBUG                   SOF_GLB_TYPE(0xAU)
+#define SOF_IPC_GLB_TEST			SOF_GLB_TYPE(0xBU)
 
 /** @} */
 
@@ -173,6 +174,14 @@
 
 /** @} */
 
+/** \name DSP Command: Test - Debug build only
+ *  @{
+ */
+
+#define SOF_IPC_TEST_IPC_FLOOD			SOF_CMD_TYPE(0x001)
+
+/** @} */
+
 /** \name IPC Message Definitions
  * @{
  */

src/ipc/handler.c

@@ -1100,6 +1100,21 @@ static int ipc_glb_tplg_message(uint32_t header)
 	}
 }
 
+#ifdef CONFIG_DEBUG
+static int ipc_glb_test_message(uint32_t header)
+{
+	uint32_t cmd = iCS(header);
+
+	switch (cmd) {
+	case SOF_IPC_TEST_IPC_FLOOD:
+		return 0; /* just return so next IPC can be sent */
+	default:
+		trace_ipc_error("ipc: unknown test header 0x%x", header);
+		return -EINVAL;
+	}
+}
+#endif
+
 /*
  * Global IPC Operations.
  */
@@ -1136,6 +1151,10 @@ int ipc_cmd(void)
 		return ipc_glb_debug_message(hdr->cmd);
 	case SOF_IPC_GLB_GDB_DEBUG:
 		return ipc_glb_gdb_debug(hdr->cmd);
+#ifdef CONFIG_DEBUG
+	case SOF_IPC_GLB_TEST:
+		return ipc_glb_test_message(hdr->cmd);
+#endif
 	default:
 		trace_ipc_error("ipc: unknown command type %u", type);
 		return -EINVAL;