forked from mirrors/linux
23d89aa0c2
In order to save power, we only need to request a channel when the communication with the DSP active. For this we export the following functions: - imx_dsp_request_channel, gets a channel with a given index - imx_dsp_free_channel, frees a channel with a given index Notice that we still request channels at probe to support devices that do not have PM callbacks implemented. More explanations about why requesting a channel has an effect on power savings: - requesting an mailbox channel will call mailbox's startup function. - startup function calls pm_runtime_get_sync which increments device usage count and will keep the device active. Specifically, mailbox clock will be always ON when a mailbox channel is requested. Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com> Reviewed-by: Paul Olaru <paul.olaru@nxp.com> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
77 lines
1.5 KiB
C
77 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright 2019 NXP
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*
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* Header file for the DSP IPC implementation
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*/
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#ifndef _IMX_DSP_IPC_H
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#define _IMX_DSP_IPC_H
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#include <linux/device.h>
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#include <linux/types.h>
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#include <linux/mailbox_client.h>
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#define DSP_MU_CHAN_NUM 4
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struct imx_dsp_chan {
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struct imx_dsp_ipc *ipc;
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struct mbox_client cl;
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struct mbox_chan *ch;
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char *name;
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int idx;
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};
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struct imx_dsp_ops {
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void (*handle_reply)(struct imx_dsp_ipc *ipc);
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void (*handle_request)(struct imx_dsp_ipc *ipc);
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};
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struct imx_dsp_ipc {
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/* Host <-> DSP communication uses 2 txdb and 2 rxdb channels */
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struct imx_dsp_chan chans[DSP_MU_CHAN_NUM];
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struct device *dev;
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struct imx_dsp_ops *ops;
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void *private_data;
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};
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static inline void imx_dsp_set_data(struct imx_dsp_ipc *ipc, void *data)
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{
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if (!ipc)
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return;
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ipc->private_data = data;
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}
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static inline void *imx_dsp_get_data(struct imx_dsp_ipc *ipc)
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{
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if (!ipc)
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return NULL;
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return ipc->private_data;
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}
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#if IS_ENABLED(CONFIG_IMX_DSP)
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int imx_dsp_ring_doorbell(struct imx_dsp_ipc *dsp, unsigned int chan_idx);
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struct mbox_chan *imx_dsp_request_channel(struct imx_dsp_ipc *ipc, int idx);
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void imx_dsp_free_channel(struct imx_dsp_ipc *ipc, int idx);
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#else
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static inline int imx_dsp_ring_doorbell(struct imx_dsp_ipc *ipc,
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unsigned int chan_idx)
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{
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return -ENOTSUPP;
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}
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struct mbox_chan *imx_dsp_request_channel(struct imx_dsp_ipc *ipc, int idx)
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{
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return ERR_PTR(-EOPNOTSUPP);
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}
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void imx_dsp_free_channel(struct imx_dsp_ipc *ipc, int idx) { }
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#endif
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#endif /* _IMX_DSP_IPC_H */
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