1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2022 MediaTek Corporation. All rights reserved.
4 * Author: Allen-KH Cheng <allen-kh.cheng@mediatek.com>
7 #include <linux/firmware/mediatek/mtk-adsp-ipc.h>
8 #include <linux/kernel.h>
9 #include <linux/mailbox_client.h>
10 #include <linux/module.h>
11 #include <linux/platform_device.h>
12 #include <linux/slab.h>
14 static const char * const adsp_mbox_ch_names[MTK_ADSP_MBOX_NUM] = { "rx", "tx" };
17 * mtk_adsp_ipc_send - send ipc cmd to MTK ADSP
19 * @ipc: ADSP IPC handle
20 * @idx: index of the mailbox channel
21 * @msg: IPC cmd (reply or request)
23 * Returns zero for success from mbox_send_message
24 * negative value for error
26 int mtk_adsp_ipc_send(struct mtk_adsp_ipc *ipc, unsigned int idx, uint32_t msg)
28 struct mtk_adsp_chan *adsp_chan;
31 if (idx >= MTK_ADSP_MBOX_NUM)
34 adsp_chan = &ipc->chans[idx];
35 ret = mbox_send_message(adsp_chan->ch, &msg);
41 EXPORT_SYMBOL_GPL(mtk_adsp_ipc_send);
44 * mtk_adsp_ipc_recv - recv callback used by MTK ADSP mailbox
47 * @msg: message received
49 * Users of ADSP IPC will need to privde handle_reply and handle_request
52 static void mtk_adsp_ipc_recv(struct mbox_client *c, void *msg)
54 struct mtk_adsp_chan *chan = container_of(c, struct mtk_adsp_chan, cl);
55 struct device *dev = c->dev;
58 case MTK_ADSP_MBOX_REPLY:
59 chan->ipc->ops->handle_reply(chan->ipc);
61 case MTK_ADSP_MBOX_REQUEST:
62 chan->ipc->ops->handle_request(chan->ipc);
65 dev_err(dev, "wrong mbox chan %d\n", chan->idx);
70 static int mtk_adsp_ipc_probe(struct platform_device *pdev)
72 struct device *dev = &pdev->dev;
73 struct mtk_adsp_ipc *adsp_ipc;
74 struct mtk_adsp_chan *adsp_chan;
75 struct mbox_client *cl;
79 device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent);
81 adsp_ipc = devm_kzalloc(dev, sizeof(*adsp_ipc), GFP_KERNEL);
85 for (i = 0; i < MTK_ADSP_MBOX_NUM; i++) {
86 adsp_chan = &adsp_ipc->chans[i];
88 cl->dev = dev->parent;
90 cl->knows_txdone = false;
91 cl->tx_prepare = NULL;
92 cl->rx_callback = mtk_adsp_ipc_recv;
94 adsp_chan->ipc = adsp_ipc;
96 adsp_chan->ch = mbox_request_channel_byname(cl, adsp_mbox_ch_names[i]);
97 if (IS_ERR(adsp_chan->ch)) {
98 ret = PTR_ERR(adsp_chan->ch);
99 if (ret != -EPROBE_DEFER)
100 dev_err(dev, "Failed to request mbox chan %s ret %d\n",
101 adsp_mbox_ch_names[i], ret);
103 for (j = 0; j < i; j++) {
104 adsp_chan = &adsp_ipc->chans[j];
105 mbox_free_channel(adsp_chan->ch);
113 dev_set_drvdata(dev, adsp_ipc);
114 dev_dbg(dev, "MTK ADSP IPC initialized\n");
119 static int mtk_adsp_ipc_remove(struct platform_device *pdev)
121 struct mtk_adsp_ipc *adsp_ipc = dev_get_drvdata(&pdev->dev);
122 struct mtk_adsp_chan *adsp_chan;
125 for (i = 0; i < MTK_ADSP_MBOX_NUM; i++) {
126 adsp_chan = &adsp_ipc->chans[i];
127 mbox_free_channel(adsp_chan->ch);
133 static struct platform_driver mtk_adsp_ipc_driver = {
135 .name = "mtk-adsp-ipc",
137 .probe = mtk_adsp_ipc_probe,
138 .remove = mtk_adsp_ipc_remove,
140 builtin_platform_driver(mtk_adsp_ipc_driver);
142 MODULE_AUTHOR("Allen-KH Cheng <allen-kh.cheng@mediatek.com>");
143 MODULE_DESCRIPTION("MTK ADSP IPC Driver");
144 MODULE_LICENSE("GPL");