diff options
Diffstat (limited to 'sound/soc/fsl/imx-audio-rpmsg.c')
| -rw-r--r-- | sound/soc/fsl/imx-audio-rpmsg.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/sound/soc/fsl/imx-audio-rpmsg.c b/sound/soc/fsl/imx-audio-rpmsg.c new file mode 100644 index 000000000..905c3a071 --- /dev/null +++ b/sound/soc/fsl/imx-audio-rpmsg.c @@ -0,0 +1,130 @@ +// SPDX-License-Identifier: GPL-2.0+ +// Copyright 2017-2020 NXP + +#include <linux/module.h> +#include <linux/rpmsg.h> +#include "imx-pcm-rpmsg.h" + +/* + * struct imx_audio_rpmsg: private data + * + * @rpmsg_pdev: pointer of platform device + */ +struct imx_audio_rpmsg { + struct platform_device *rpmsg_pdev; +}; + +static int imx_audio_rpmsg_cb(struct rpmsg_device *rpdev, void *data, int len, + void *priv, u32 src) +{ + struct imx_audio_rpmsg *rpmsg = dev_get_drvdata(&rpdev->dev); + struct rpmsg_r_msg *r_msg = (struct rpmsg_r_msg *)data; + struct rpmsg_info *info; + struct rpmsg_msg *msg; + unsigned long flags; + + if (!rpmsg->rpmsg_pdev) + return 0; + + info = platform_get_drvdata(rpmsg->rpmsg_pdev); + + dev_dbg(&rpdev->dev, "get from%d: cmd:%d. %d\n", + src, r_msg->header.cmd, r_msg->param.resp); + + switch (r_msg->header.type) { + case MSG_TYPE_C: + /* TYPE C is notification from M core */ + switch (r_msg->header.cmd) { + case TX_PERIOD_DONE: + spin_lock_irqsave(&info->lock[TX], flags); + msg = &info->msg[TX_PERIOD_DONE + MSG_TYPE_A_NUM]; + msg->r_msg.param.buffer_tail = + r_msg->param.buffer_tail; + msg->r_msg.param.buffer_tail %= info->num_period[TX]; + spin_unlock_irqrestore(&info->lock[TX], flags); + info->callback[TX](info->callback_param[TX]); + break; + case RX_PERIOD_DONE: + spin_lock_irqsave(&info->lock[RX], flags); + msg = &info->msg[RX_PERIOD_DONE + MSG_TYPE_A_NUM]; + msg->r_msg.param.buffer_tail = + r_msg->param.buffer_tail; + msg->r_msg.param.buffer_tail %= info->num_period[1]; + spin_unlock_irqrestore(&info->lock[RX], flags); + info->callback[RX](info->callback_param[RX]); + break; + default: + dev_warn(&rpdev->dev, "unknown msg command\n"); + break; + } + break; + case MSG_TYPE_B: + /* TYPE B is response msg */ + memcpy(&info->r_msg, r_msg, sizeof(struct rpmsg_r_msg)); + complete(&info->cmd_complete); + break; + default: + dev_warn(&rpdev->dev, "unknown msg type\n"); + break; + } + + return 0; +} + +static int imx_audio_rpmsg_probe(struct rpmsg_device *rpdev) +{ + struct imx_audio_rpmsg *data; + int ret = 0; + + dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n", + rpdev->src, rpdev->dst); + + data = devm_kzalloc(&rpdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + dev_set_drvdata(&rpdev->dev, data); + + /* Register platform driver for rpmsg routine */ + data->rpmsg_pdev = platform_device_register_data(&rpdev->dev, + IMX_PCM_DRV_NAME, + PLATFORM_DEVID_NONE, + NULL, 0); + if (IS_ERR(data->rpmsg_pdev)) { + dev_err(&rpdev->dev, "failed to register rpmsg platform.\n"); + ret = PTR_ERR(data->rpmsg_pdev); + } + + return ret; +} + +static void imx_audio_rpmsg_remove(struct rpmsg_device *rpdev) +{ + struct imx_audio_rpmsg *data = dev_get_drvdata(&rpdev->dev); + + if (data->rpmsg_pdev) + platform_device_unregister(data->rpmsg_pdev); + + dev_info(&rpdev->dev, "audio rpmsg driver is removed\n"); +} + +static struct rpmsg_device_id imx_audio_rpmsg_id_table[] = { + { .name = "rpmsg-audio-channel" }, + { }, +}; + +static struct rpmsg_driver imx_audio_rpmsg_driver = { + .drv.name = "imx_audio_rpmsg", + .drv.owner = THIS_MODULE, + .id_table = imx_audio_rpmsg_id_table, + .probe = imx_audio_rpmsg_probe, + .callback = imx_audio_rpmsg_cb, + .remove = imx_audio_rpmsg_remove, +}; + +module_rpmsg_driver(imx_audio_rpmsg_driver); + +MODULE_DESCRIPTION("Freescale SoC Audio RPMSG interface"); +MODULE_AUTHOR("Shengjiu Wang <shengjiu.wang@nxp.com>"); +MODULE_ALIAS("platform:imx_audio_rpmsg"); +MODULE_LICENSE("GPL v2"); |