1 // SPDX-License-Identifier: GPL-2.0+
2 // Copyright 2017-2020 NXP
3
4 #include <linux/module.h>
5 #include <linux/rpmsg.h>
6 #include "imx-pcm-rpmsg.h"
7
8 /*
9 * struct imx_audio_rpmsg: private data
10 *
11 * @rpmsg_pdev: pointer of platform device
12 */
13 struct imx_audio_rpmsg {
14 struct platform_device *rpmsg_pdev;
15 };
16
imx_audio_rpmsg_cb(struct rpmsg_device * rpdev,void * data,int len,void * priv,u32 src)17 static int imx_audio_rpmsg_cb(struct rpmsg_device *rpdev, void *data, int len,
18 void *priv, u32 src)
19 {
20 struct imx_audio_rpmsg *rpmsg = dev_get_drvdata(&rpdev->dev);
21 struct rpmsg_r_msg *r_msg = (struct rpmsg_r_msg *)data;
22 struct rpmsg_info *info;
23 struct rpmsg_msg *msg;
24 unsigned long flags;
25
26 if (!rpmsg->rpmsg_pdev)
27 return 0;
28
29 info = platform_get_drvdata(rpmsg->rpmsg_pdev);
30
31 dev_dbg(&rpdev->dev, "get from%d: cmd:%d. %d\n",
32 src, r_msg->header.cmd, r_msg->param.resp);
33
34 switch (r_msg->header.type) {
35 case MSG_TYPE_C:
36 /* TYPE C is notification from M core */
37 switch (r_msg->header.cmd) {
38 case TX_PERIOD_DONE:
39 spin_lock_irqsave(&info->lock[TX], flags);
40 msg = &info->msg[TX_PERIOD_DONE + MSG_TYPE_A_NUM];
41 msg->r_msg.param.buffer_tail =
42 r_msg->param.buffer_tail;
43 msg->r_msg.param.buffer_tail %= info->num_period[TX];
44 spin_unlock_irqrestore(&info->lock[TX], flags);
45 info->callback[TX](info->callback_param[TX]);
46 break;
47 case RX_PERIOD_DONE:
48 spin_lock_irqsave(&info->lock[RX], flags);
49 msg = &info->msg[RX_PERIOD_DONE + MSG_TYPE_A_NUM];
50 msg->r_msg.param.buffer_tail =
51 r_msg->param.buffer_tail;
52 msg->r_msg.param.buffer_tail %= info->num_period[1];
53 spin_unlock_irqrestore(&info->lock[RX], flags);
54 info->callback[RX](info->callback_param[RX]);
55 break;
56 default:
57 dev_warn(&rpdev->dev, "unknown msg command\n");
58 break;
59 }
60 break;
61 case MSG_TYPE_B:
62 /* TYPE B is response msg */
63 memcpy(&info->r_msg, r_msg, sizeof(struct rpmsg_r_msg));
64 complete(&info->cmd_complete);
65 break;
66 default:
67 dev_warn(&rpdev->dev, "unknown msg type\n");
68 break;
69 }
70
71 return 0;
72 }
73
imx_audio_rpmsg_probe(struct rpmsg_device * rpdev)74 static int imx_audio_rpmsg_probe(struct rpmsg_device *rpdev)
75 {
76 struct imx_audio_rpmsg *data;
77 int ret = 0;
78
79 dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n",
80 rpdev->src, rpdev->dst);
81
82 data = devm_kzalloc(&rpdev->dev, sizeof(*data), GFP_KERNEL);
83 if (!data)
84 return -ENOMEM;
85
86 dev_set_drvdata(&rpdev->dev, data);
87
88 /* Register platform driver for rpmsg routine */
89 data->rpmsg_pdev = platform_device_register_data(&rpdev->dev,
90 IMX_PCM_DRV_NAME,
91 PLATFORM_DEVID_NONE,
92 NULL, 0);
93 if (IS_ERR(data->rpmsg_pdev)) {
94 dev_err(&rpdev->dev, "failed to register rpmsg platform.\n");
95 ret = PTR_ERR(data->rpmsg_pdev);
96 }
97
98 return ret;
99 }
100
imx_audio_rpmsg_remove(struct rpmsg_device * rpdev)101 static void imx_audio_rpmsg_remove(struct rpmsg_device *rpdev)
102 {
103 struct imx_audio_rpmsg *data = dev_get_drvdata(&rpdev->dev);
104
105 if (data->rpmsg_pdev)
106 platform_device_unregister(data->rpmsg_pdev);
107
108 dev_info(&rpdev->dev, "audio rpmsg driver is removed\n");
109 }
110
111 static struct rpmsg_device_id imx_audio_rpmsg_id_table[] = {
112 { .name = "rpmsg-audio-channel" },
113 { },
114 };
115
116 static struct rpmsg_driver imx_audio_rpmsg_driver = {
117 .drv.name = "imx_audio_rpmsg",
118 .drv.owner = THIS_MODULE,
119 .id_table = imx_audio_rpmsg_id_table,
120 .probe = imx_audio_rpmsg_probe,
121 .callback = imx_audio_rpmsg_cb,
122 .remove = imx_audio_rpmsg_remove,
123 };
124
imx_audio_rpmsg_init(void)125 static int __init imx_audio_rpmsg_init(void)
126 {
127 return register_rpmsg_driver(&imx_audio_rpmsg_driver);
128 }
129
imx_audio_rpmsg_exit(void)130 static void __exit imx_audio_rpmsg_exit(void)
131 {
132 unregister_rpmsg_driver(&imx_audio_rpmsg_driver);
133 }
134 module_init(imx_audio_rpmsg_init);
135 module_exit(imx_audio_rpmsg_exit);
136
137 MODULE_DESCRIPTION("Freescale SoC Audio RPMSG interface");
138 MODULE_AUTHOR("Shengjiu Wang <shengjiu.wang@nxp.com>");
139 MODULE_ALIAS("platform:imx_audio_rpmsg");
140 MODULE_LICENSE("GPL v2");
141