firmware/imx/dsp.h

0001 /* SPDX-License-Identifier: GPL-2.0+ */
0002 /*
0003  * Copyright 2019 NXP
0004  *
0005  * Header file for the DSP IPC implementation
0006  */
0007
0008 #ifndef _IMX_DSP_IPC_H
0009 #define _IMX_DSP_IPC_H
0010
0011 #include <linux/device.h>
0012 #include <linux/types.h>
0013 #include <linux/mailbox_client.h>
0014
0015 #define DSP_MU_CHAN_NUM     4
0016
0017 struct imx_dsp_chan {
0018     struct imx_dsp_ipc *ipc;
0019     struct mbox_client cl;
0020     struct mbox_chan *ch;
0021     char *name;
0022     int idx;
0023 };
0024
0025 struct imx_dsp_ops {
0026     void (*handle_reply)(struct imx_dsp_ipc *ipc);
0027     void (*handle_request)(struct imx_dsp_ipc *ipc);
0028 };
0029
0030 struct imx_dsp_ipc {
0031     /* Host <-> DSP communication uses 2 txdb and 2 rxdb channels */
0032     struct imx_dsp_chan chans[DSP_MU_CHAN_NUM];
0033     struct device *dev;
0034     struct imx_dsp_ops *ops;
0035     void *private_data;
0036 };
0037
0038 static inline void imx_dsp_set_data(struct imx_dsp_ipc *ipc, void *data)
0039 {
0040     if (!ipc)
0041         return;
0042
0043     ipc->private_data = data;
0044 }
0045
0046 static inline void *imx_dsp_get_data(struct imx_dsp_ipc *ipc)
0047 {
0048     if (!ipc)
0049         return NULL;
0050
0051     return ipc->private_data;
0052 }
0053
0054 #if IS_ENABLED(CONFIG_IMX_DSP)
0055
0056 int imx_dsp_ring_doorbell(struct imx_dsp_ipc *dsp, unsigned int chan_idx);
0057
0058 struct mbox_chan *imx_dsp_request_channel(struct imx_dsp_ipc *ipc, int idx);
0059 void imx_dsp_free_channel(struct imx_dsp_ipc *ipc, int idx);
0060
0061 #else
0062
0063 static inline int imx_dsp_ring_doorbell(struct imx_dsp_ipc *ipc,
0064                     unsigned int chan_idx)
0065 {
0066     return -ENOTSUPP;
0067 }
0068
0069 struct mbox_chan *imx_dsp_request_channel(struct imx_dsp_ipc *ipc, int idx)
0070 {
0071     return ERR_PTR(-EOPNOTSUPP);
0072 }
0073
0074 void imx_dsp_free_channel(struct imx_dsp_ipc *ipc, int idx) { }
0075
0076 #endif
0077 #endif /* _IMX_DSP_IPC_H */