1 // SPDX-License-Identifier: GPL-2.0+
6  * Implementation of the DSP IPC interface (host side)
18  * imx_dsp_ring_doorbell - triggers an interrupt on the other side (DSP)
20  * @dsp: DSP IPC handle
23  * Returns non-negative value for success, negative value for error
25 int imx_dsp_ring_doorbell(struct imx_dsp_ipc *ipc, unsigned int idx)  in imx_dsp_ring_doorbell()  argument
31 		return -EINVAL;  in imx_dsp_ring_doorbell()
33 	dsp_chan = &ipc->chans[idx];  in imx_dsp_ring_doorbell()
34 	ret = mbox_send_message(dsp_chan->ch, NULL);  in imx_dsp_ring_doorbell()
43  * imx_dsp_handle_rx - rx callback used by imx mailbox
48  * Users of DSP IPC will need to privde handle_reply and handle_request
55 	if (chan->idx == 0) {  in imx_dsp_handle_rx()
56 		chan->ipc->ops->handle_reply(chan->ipc);  in imx_dsp_handle_rx()
58 		chan->ipc->ops->handle_request(chan->ipc);  in imx_dsp_handle_rx()
59 		imx_dsp_ring_doorbell(chan->ipc, 1);  in imx_dsp_handle_rx()
68 		return ERR_PTR(-EINVAL);  in imx_dsp_request_channel()
70 	dsp_chan = &dsp_ipc->chans[idx];  in imx_dsp_request_channel()
71 	dsp_chan->ch = mbox_request_channel_byname(&dsp_chan->cl, dsp_chan->name);  in imx_dsp_request_channel()
72 	return dsp_chan->ch;  in imx_dsp_request_channel()
83 	dsp_chan = &dsp_ipc->chans[idx];  in imx_dsp_free_channel()
84 	mbox_free_channel(dsp_chan->ch);  in imx_dsp_free_channel()
90 	struct device *dev = dsp_ipc->dev;  in imx_dsp_setup_channels()
101 			chan_name = kasprintf(GFP_KERNEL, "rxdb%d", i - 2);  in imx_dsp_setup_channels()
104 			return -ENOMEM;  in imx_dsp_setup_channels()
106 		dsp_chan = &dsp_ipc->chans[i];  in imx_dsp_setup_channels()
107 		dsp_chan->name = chan_name;  in imx_dsp_setup_channels()
108 		cl = &dsp_chan->cl;  in imx_dsp_setup_channels()
109 		cl->dev = dev;  in imx_dsp_setup_channels()
110 		cl->tx_block = false;  in imx_dsp_setup_channels()
111 		cl->knows_txdone = true;  in imx_dsp_setup_channels()
112 		cl->rx_callback = imx_dsp_handle_rx;  in imx_dsp_setup_channels()
114 		dsp_chan->ipc = dsp_ipc;  in imx_dsp_setup_channels()
115 		dsp_chan->idx = i % 2;  in imx_dsp_setup_channels()
116 		dsp_chan->ch = mbox_request_channel_byname(cl, chan_name);  in imx_dsp_setup_channels()
117 		if (IS_ERR(dsp_chan->ch)) {  in imx_dsp_setup_channels()
118 			ret = PTR_ERR(dsp_chan->ch);  in imx_dsp_setup_channels()
119 			if (ret != -EPROBE_DEFER)  in imx_dsp_setup_channels()
131 		dsp_chan = &dsp_ipc->chans[j];  in imx_dsp_setup_channels()
132 		mbox_free_channel(dsp_chan->ch);  in imx_dsp_setup_channels()
133 		kfree(dsp_chan->name);  in imx_dsp_setup_channels()
141 	struct device *dev = &pdev->dev;  in imx_dsp_probe()
145 	device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent);  in imx_dsp_probe()
149 		return -ENOMEM;  in imx_dsp_probe()
151 	dsp_ipc->dev = dev;  in imx_dsp_probe()
158 	dev_info(dev, "NXP i.MX DSP IPC initialized\n");  in imx_dsp_probe()
169 	dsp_ipc = dev_get_drvdata(&pdev->dev);  in imx_dsp_remove()
172 		dsp_chan = &dsp_ipc->chans[i];  in imx_dsp_remove()
173 		mbox_free_channel(dsp_chan->ch);  in imx_dsp_remove()
174 		kfree(dsp_chan->name);  in imx_dsp_remove()
182 		.name = "imx-dsp",
190 MODULE_DESCRIPTION("IMX DSP IPC protocol driver");