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This driver is used to accept the message from rpmsg audio channel, and if this driver is probed, it will help to register the platform driver, the platform driver will use this audio channel to send and receive messages to and from Cortex-M core. Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com> Link: https://lore.kernel.org/r/1615516725-4975-5-git-send-email-shengjiu.wang@nxp.com Signed-off-by: Mark Brown <broonie@kernel.org>
141 lines
3.6 KiB
C
141 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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// Copyright 2017-2020 NXP
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#include <linux/module.h>
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#include <linux/rpmsg.h>
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#include "imx-pcm-rpmsg.h"
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/*
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* struct imx_audio_rpmsg: private data
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*
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* @rpmsg_pdev: pointer of platform device
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*/
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struct imx_audio_rpmsg {
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struct platform_device *rpmsg_pdev;
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};
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static int imx_audio_rpmsg_cb(struct rpmsg_device *rpdev, void *data, int len,
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void *priv, u32 src)
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{
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struct imx_audio_rpmsg *rpmsg = dev_get_drvdata(&rpdev->dev);
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struct rpmsg_r_msg *r_msg = (struct rpmsg_r_msg *)data;
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struct rpmsg_info *info;
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struct rpmsg_msg *msg;
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unsigned long flags;
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if (!rpmsg->rpmsg_pdev)
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return 0;
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info = platform_get_drvdata(rpmsg->rpmsg_pdev);
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dev_dbg(&rpdev->dev, "get from%d: cmd:%d. %d\n",
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src, r_msg->header.cmd, r_msg->param.resp);
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switch (r_msg->header.type) {
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case MSG_TYPE_C:
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/* TYPE C is notification from M core */
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switch (r_msg->header.cmd) {
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case TX_PERIOD_DONE:
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spin_lock_irqsave(&info->lock[TX], flags);
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msg = &info->msg[TX_PERIOD_DONE + MSG_TYPE_A_NUM];
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msg->r_msg.param.buffer_tail =
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r_msg->param.buffer_tail;
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msg->r_msg.param.buffer_tail %= info->num_period[TX];
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spin_unlock_irqrestore(&info->lock[TX], flags);
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info->callback[TX](info->callback_param[TX]);
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break;
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case RX_PERIOD_DONE:
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spin_lock_irqsave(&info->lock[RX], flags);
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msg = &info->msg[RX_PERIOD_DONE + MSG_TYPE_A_NUM];
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msg->r_msg.param.buffer_tail =
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r_msg->param.buffer_tail;
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msg->r_msg.param.buffer_tail %= info->num_period[1];
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spin_unlock_irqrestore(&info->lock[RX], flags);
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info->callback[RX](info->callback_param[RX]);
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break;
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default:
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dev_warn(&rpdev->dev, "unknown msg command\n");
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break;
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}
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break;
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case MSG_TYPE_B:
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/* TYPE B is response msg */
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memcpy(&info->r_msg, r_msg, sizeof(struct rpmsg_r_msg));
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complete(&info->cmd_complete);
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break;
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default:
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dev_warn(&rpdev->dev, "unknown msg type\n");
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break;
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}
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return 0;
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}
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static int imx_audio_rpmsg_probe(struct rpmsg_device *rpdev)
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{
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struct imx_audio_rpmsg *data;
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int ret = 0;
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dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n",
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rpdev->src, rpdev->dst);
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data = devm_kzalloc(&rpdev->dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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dev_set_drvdata(&rpdev->dev, data);
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/* Register platform driver for rpmsg routine */
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data->rpmsg_pdev = platform_device_register_data(&rpdev->dev,
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IMX_PCM_DRV_NAME,
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PLATFORM_DEVID_NONE,
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NULL, 0);
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if (IS_ERR(data->rpmsg_pdev)) {
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dev_err(&rpdev->dev, "failed to register rpmsg platform.\n");
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ret = PTR_ERR(data->rpmsg_pdev);
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}
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return ret;
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}
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static void imx_audio_rpmsg_remove(struct rpmsg_device *rpdev)
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{
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struct imx_audio_rpmsg *data = dev_get_drvdata(&rpdev->dev);
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if (data->rpmsg_pdev)
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platform_device_unregister(data->rpmsg_pdev);
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dev_info(&rpdev->dev, "audio rpmsg driver is removed\n");
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}
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static struct rpmsg_device_id imx_audio_rpmsg_id_table[] = {
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{ .name = "rpmsg-audio-channel" },
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{ },
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};
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static struct rpmsg_driver imx_audio_rpmsg_driver = {
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.drv.name = "imx_audio_rpmsg",
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.drv.owner = THIS_MODULE,
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.id_table = imx_audio_rpmsg_id_table,
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.probe = imx_audio_rpmsg_probe,
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.callback = imx_audio_rpmsg_cb,
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.remove = imx_audio_rpmsg_remove,
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};
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static int __init imx_audio_rpmsg_init(void)
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{
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return register_rpmsg_driver(&imx_audio_rpmsg_driver);
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}
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static void __exit imx_audio_rpmsg_exit(void)
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{
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unregister_rpmsg_driver(&imx_audio_rpmsg_driver);
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}
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module_init(imx_audio_rpmsg_init);
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module_exit(imx_audio_rpmsg_exit);
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MODULE_DESCRIPTION("Freescale SoC Audio RPMSG interface");
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MODULE_AUTHOR("Shengjiu Wang <shengjiu.wang@nxp.com>");
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MODULE_ALIAS("platform:imx_audio_rpmsg");
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MODULE_LICENSE("GPL v2");
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