1 // SPDX-License-Identifier: GPL-2.0+
3  * Copyright 2019 NXP
4  *  Author: Daniel Baluta <daniel.baluta@nxp.com>
9 #include <linux/firmware/imx/dsp.h>
18  * imx_dsp_ring_doorbell - triggers an interrupt on the other side (DSP)
23  * Returns non-negative value for success, negative value for error
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
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()
65 	struct device *dev = &pdev->dev;  in imx_dsp_probe()
73 	device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent);  in imx_dsp_probe()
77 		return -ENOMEM;  in imx_dsp_probe()
83 			chan_name = kasprintf(GFP_KERNEL, "rxdb%d", i - 2);  in imx_dsp_probe()
86 			return -ENOMEM;  in imx_dsp_probe()
88 		dsp_chan = &dsp_ipc->chans[i];  in imx_dsp_probe()
89 		cl = &dsp_chan->cl;  in imx_dsp_probe()
90 		cl->dev = dev;  in imx_dsp_probe()
91 		cl->tx_block = false;  in imx_dsp_probe()
92 		cl->knows_txdone = true;  in imx_dsp_probe()
93 		cl->rx_callback = imx_dsp_handle_rx;  in imx_dsp_probe()
95 		dsp_chan->ipc = dsp_ipc;  in imx_dsp_probe()
96 		dsp_chan->idx = i % 2;  in imx_dsp_probe()
97 		dsp_chan->ch = mbox_request_channel_byname(cl, chan_name);  in imx_dsp_probe()
98 		if (IS_ERR(dsp_chan->ch)) {  in imx_dsp_probe()
99 			ret = PTR_ERR(dsp_chan->ch);  in imx_dsp_probe()
100 			if (ret != -EPROBE_DEFER)  in imx_dsp_probe()
111 	dsp_ipc->dev = dev;  in imx_dsp_probe()
115 	dev_info(dev, "NXP i.MX DSP IPC initialized\n");  in imx_dsp_probe()
121 		dsp_chan = &dsp_ipc->chans[j];  in imx_dsp_probe()
122 		mbox_free_channel(dsp_chan->ch);  in imx_dsp_probe()
134 	dsp_ipc = dev_get_drvdata(&pdev->dev);  in imx_dsp_remove()
137 		dsp_chan = &dsp_ipc->chans[i];  in imx_dsp_remove()
138 		mbox_free_channel(dsp_chan->ch);  in imx_dsp_remove()
146 		.name = "imx-dsp",
153 MODULE_AUTHOR("Daniel Baluta <daniel.baluta@nxp.com>");
154 MODULE_DESCRIPTION("IMX DSP IPC protocol driver");