Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/linux/firmware/imx/dsp.h b/include/linux/firmware/imx/dsp.h
new file mode 100644
index 0000000..7562099
--- /dev/null
+++ b/include/linux/firmware/imx/dsp.h
@@ -0,0 +1,67 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2019 NXP
+ *
+ * Header file for the DSP IPC implementation
+ */
+
+#ifndef _IMX_DSP_IPC_H
+#define _IMX_DSP_IPC_H
+
+#include <linux/device.h>
+#include <linux/types.h>
+#include <linux/mailbox_client.h>
+
+#define DSP_MU_CHAN_NUM 4
+
+struct imx_dsp_chan {
+ struct imx_dsp_ipc *ipc;
+ struct mbox_client cl;
+ struct mbox_chan *ch;
+ char *name;
+ int idx;
+};
+
+struct imx_dsp_ops {
+ void (*handle_reply)(struct imx_dsp_ipc *ipc);
+ void (*handle_request)(struct imx_dsp_ipc *ipc);
+};
+
+struct imx_dsp_ipc {
+ /* Host <-> DSP communication uses 2 txdb and 2 rxdb channels */
+ struct imx_dsp_chan chans[DSP_MU_CHAN_NUM];
+ struct device *dev;
+ struct imx_dsp_ops *ops;
+ void *private_data;
+};
+
+static inline void imx_dsp_set_data(struct imx_dsp_ipc *ipc, void *data)
+{
+ if (!ipc)
+ return;
+
+ ipc->private_data = data;
+}
+
+static inline void *imx_dsp_get_data(struct imx_dsp_ipc *ipc)
+{
+ if (!ipc)
+ return NULL;
+
+ return ipc->private_data;
+}
+
+#if IS_ENABLED(CONFIG_IMX_DSP)
+
+int imx_dsp_ring_doorbell(struct imx_dsp_ipc *dsp, unsigned int chan_idx);
+
+#else
+
+static inline int imx_dsp_ring_doorbell(struct imx_dsp_ipc *ipc,
+ unsigned int chan_idx)
+{
+ return -ENOTSUPP;
+}
+
+#endif
+#endif /* _IMX_DSP_IPC_H */