Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 834 insertions, 0 deletions

diff --git a/sound/soc/fsl/imx-pcm-rpmsg.c b/sound/soc/fsl/imx-pcm-rpmsg.c
new file mode 100644
index 000000000..933bac7ea
--- /dev/null
+++ b/sound/soc/fsl/imx-pcm-rpmsg.c
@@ -0,0 +1,834 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright 2017-2021 NXP
+
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/rpmsg.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/soc.h>
+
+#include "imx-pcm.h"
+#include "fsl_rpmsg.h"
+#include "imx-pcm-rpmsg.h"
+
+static struct snd_pcm_hardware imx_rpmsg_pcm_hardware = {
+	.info = SNDRV_PCM_INFO_INTERLEAVED |
+		SNDRV_PCM_INFO_BLOCK_TRANSFER |
+		SNDRV_PCM_INFO_BATCH |
+		SNDRV_PCM_INFO_MMAP |
+		SNDRV_PCM_INFO_MMAP_VALID |
+		SNDRV_PCM_INFO_NO_PERIOD_WAKEUP |
+		SNDRV_PCM_INFO_PAUSE |
+		SNDRV_PCM_INFO_RESUME,
+	.buffer_bytes_max = IMX_DEFAULT_DMABUF_SIZE,
+	.period_bytes_min = 512,
+	.period_bytes_max = 65536,
+	.periods_min = 2,
+	.periods_max = 6000,
+	.fifo_size = 0,
+};
+
+static int imx_rpmsg_pcm_send_message(struct rpmsg_msg *msg,
+				      struct rpmsg_info *info)
+{
+	struct rpmsg_device *rpdev = info->rpdev;
+	int ret = 0;
+
+	mutex_lock(&info->msg_lock);
+	if (!rpdev) {
+		dev_err(info->dev, "rpmsg channel not ready\n");
+		mutex_unlock(&info->msg_lock);
+		return -EINVAL;
+	}
+
+	dev_dbg(&rpdev->dev, "send cmd %d\n", msg->s_msg.header.cmd);
+
+	if (!(msg->s_msg.header.type == MSG_TYPE_C))
+		reinit_completion(&info->cmd_complete);
+
+	ret = rpmsg_send(rpdev->ept, (void *)&msg->s_msg,
+			 sizeof(struct rpmsg_s_msg));
+	if (ret) {
+		dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
+		mutex_unlock(&info->msg_lock);
+		return ret;
+	}
+
+	/* No receive msg for TYPE_C command */
+	if (msg->s_msg.header.type == MSG_TYPE_C) {
+		mutex_unlock(&info->msg_lock);
+		return 0;
+	}
+
+	/* wait response from rpmsg */
+	ret = wait_for_completion_timeout(&info->cmd_complete,
+					  msecs_to_jiffies(RPMSG_TIMEOUT));
+	if (!ret) {
+		dev_err(&rpdev->dev, "rpmsg_send cmd %d timeout!\n",
+			msg->s_msg.header.cmd);
+		mutex_unlock(&info->msg_lock);
+		return -ETIMEDOUT;
+	}
+
+	memcpy(&msg->r_msg, &info->r_msg, sizeof(struct rpmsg_r_msg));
+	memcpy(&info->msg[msg->r_msg.header.cmd].r_msg,
+	       &msg->r_msg, sizeof(struct rpmsg_r_msg));
+
+	/*
+	 * Reset the buffer pointer to be zero, actully we have
+	 * set the buffer pointer to be zero in imx_rpmsg_terminate_all
+	 * But if there is timer task queued in queue, after it is
+	 * executed the buffer pointer will be changed, so need to
+	 * reset it again with TERMINATE command.
+	 */
+	switch (msg->s_msg.header.cmd) {
+	case TX_TERMINATE:
+		info->msg[TX_POINTER].r_msg.param.buffer_offset = 0;
+		break;
+	case RX_TERMINATE:
+		info->msg[RX_POINTER].r_msg.param.buffer_offset = 0;
+		break;
+	default:
+		break;
+	}
+
+	dev_dbg(&rpdev->dev, "cmd:%d, resp %d\n", msg->s_msg.header.cmd,
+		info->r_msg.param.resp);
+
+	mutex_unlock(&info->msg_lock);
+
+	return 0;
+}
+
+static int imx_rpmsg_insert_workqueue(struct snd_pcm_substream *substream,
+				      struct rpmsg_msg *msg,
+				      struct rpmsg_info *info)
+{
+	unsigned long flags;
+	int ret = 0;
+
+	/*
+	 * Queue the work to workqueue.
+	 * If the queue is full, drop the message.
+	 */
+	spin_lock_irqsave(&info->wq_lock, flags);
+	if (info->work_write_index != info->work_read_index) {
+		int index = info->work_write_index;
+
+		memcpy(&info->work_list[index].msg, msg,
+		       sizeof(struct rpmsg_s_msg));
+
+		queue_work(info->rpmsg_wq, &info->work_list[index].work);
+		info->work_write_index++;
+		info->work_write_index %= WORK_MAX_NUM;
+	} else {
+		info->msg_drop_count[substream->stream]++;
+		ret = -EPIPE;
+	}
+	spin_unlock_irqrestore(&info->wq_lock, flags);
+
+	return ret;
+}
+
+static int imx_rpmsg_pcm_hw_params(struct snd_soc_component *component,
+				   struct snd_pcm_substream *substream,
+				   struct snd_pcm_hw_params *params)
+{
+	struct rpmsg_info *info = dev_get_drvdata(component->dev);
+	struct rpmsg_msg *msg;
+	int ret = 0;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		msg = &info->msg[TX_HW_PARAM];
+		msg->s_msg.header.cmd = TX_HW_PARAM;
+	} else {
+		msg = &info->msg[RX_HW_PARAM];
+		msg->s_msg.header.cmd = RX_HW_PARAM;
+	}
+
+	msg->s_msg.param.rate = params_rate(params);
+
+	switch (params_format(params)) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+		msg->s_msg.param.format   = RPMSG_S16_LE;
+		break;
+	case SNDRV_PCM_FORMAT_S24_LE:
+		msg->s_msg.param.format   = RPMSG_S24_LE;
+		break;
+	case SNDRV_PCM_FORMAT_DSD_U16_LE:
+		msg->s_msg.param.format   = RPMSG_DSD_U16_LE;
+		break;
+	case SNDRV_PCM_FORMAT_DSD_U32_LE:
+		msg->s_msg.param.format   = RPMSG_DSD_U32_LE;
+		break;
+	default:
+		msg->s_msg.param.format   = RPMSG_S32_LE;
+		break;
+	}
+
+	switch (params_channels(params)) {
+	case 1:
+		msg->s_msg.param.channels = RPMSG_CH_LEFT;
+		break;
+	case 2:
+		msg->s_msg.param.channels = RPMSG_CH_STEREO;
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	info->send_message(msg, info);
+
+	return ret;
+}
+
+static snd_pcm_uframes_t imx_rpmsg_pcm_pointer(struct snd_soc_component *component,
+					       struct snd_pcm_substream *substream)
+{
+	struct rpmsg_info *info = dev_get_drvdata(component->dev);
+	struct rpmsg_msg *msg;
+	unsigned int pos = 0;
+	int buffer_tail = 0;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		msg = &info->msg[TX_PERIOD_DONE + MSG_TYPE_A_NUM];
+	else
+		msg = &info->msg[RX_PERIOD_DONE + MSG_TYPE_A_NUM];
+
+	buffer_tail = msg->r_msg.param.buffer_tail;
+	pos = buffer_tail * snd_pcm_lib_period_bytes(substream);
+
+	return bytes_to_frames(substream->runtime, pos);
+}
+
+static void imx_rpmsg_timer_callback(struct timer_list *t)
+{
+	struct stream_timer  *stream_timer =
+			from_timer(stream_timer, t, timer);
+	struct snd_pcm_substream *substream = stream_timer->substream;
+	struct rpmsg_info *info = stream_timer->info;
+	struct rpmsg_msg *msg;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		msg = &info->msg[TX_PERIOD_DONE + MSG_TYPE_A_NUM];
+		msg->s_msg.header.cmd = TX_PERIOD_DONE;
+	} else {
+		msg = &info->msg[RX_PERIOD_DONE + MSG_TYPE_A_NUM];
+		msg->s_msg.header.cmd = RX_PERIOD_DONE;
+	}
+
+	imx_rpmsg_insert_workqueue(substream, msg, info);
+}
+
+static int imx_rpmsg_pcm_open(struct snd_soc_component *component,
+			      struct snd_pcm_substream *substream)
+{
+	struct rpmsg_info *info = dev_get_drvdata(component->dev);
+	struct rpmsg_msg *msg;
+	int ret = 0;
+	int cmd;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		msg = &info->msg[TX_OPEN];
+		msg->s_msg.header.cmd = TX_OPEN;
+
+		/* reinitialize buffer counter*/
+		cmd = TX_PERIOD_DONE + MSG_TYPE_A_NUM;
+		info->msg[cmd].s_msg.param.buffer_tail = 0;
+		info->msg[cmd].r_msg.param.buffer_tail = 0;
+		info->msg[TX_POINTER].r_msg.param.buffer_offset = 0;
+
+	} else {
+		msg = &info->msg[RX_OPEN];
+		msg->s_msg.header.cmd = RX_OPEN;
+
+		/* reinitialize buffer counter*/
+		cmd = RX_PERIOD_DONE + MSG_TYPE_A_NUM;
+		info->msg[cmd].s_msg.param.buffer_tail = 0;
+		info->msg[cmd].r_msg.param.buffer_tail = 0;
+		info->msg[RX_POINTER].r_msg.param.buffer_offset = 0;
+	}
+
+	info->send_message(msg, info);
+
+	imx_rpmsg_pcm_hardware.period_bytes_max =
+			imx_rpmsg_pcm_hardware.buffer_bytes_max / 2;
+
+	snd_soc_set_runtime_hwparams(substream, &imx_rpmsg_pcm_hardware);
+
+	ret = snd_pcm_hw_constraint_integer(substream->runtime,
+					    SNDRV_PCM_HW_PARAM_PERIODS);
+	if (ret < 0)
+		return ret;
+
+	info->msg_drop_count[substream->stream] = 0;
+
+	/* Create timer*/
+	info->stream_timer[substream->stream].info = info;
+	info->stream_timer[substream->stream].substream = substream;
+	timer_setup(&info->stream_timer[substream->stream].timer,
+		    imx_rpmsg_timer_callback, 0);
+	return ret;
+}
+
+static int imx_rpmsg_pcm_close(struct snd_soc_component *component,
+			       struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	struct rpmsg_info *info = dev_get_drvdata(component->dev);
+	struct rpmsg_msg *msg;
+	int ret = 0;
+
+	/* Flush work in workqueue to make TX_CLOSE is the last message */
+	flush_workqueue(info->rpmsg_wq);
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		msg = &info->msg[TX_CLOSE];
+		msg->s_msg.header.cmd = TX_CLOSE;
+	} else {
+		msg = &info->msg[RX_CLOSE];
+		msg->s_msg.header.cmd = RX_CLOSE;
+	}
+
+	info->send_message(msg, info);
+
+	del_timer(&info->stream_timer[substream->stream].timer);
+
+	rtd->dai_link->ignore_suspend = 0;
+
+	if (info->msg_drop_count[substream->stream])
+		dev_warn(rtd->dev, "Msg is dropped!, number is %d\n",
+			 info->msg_drop_count[substream->stream]);
+
+	return ret;
+}
+
+static int imx_rpmsg_pcm_prepare(struct snd_soc_component *component,
+				 struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
+	struct fsl_rpmsg *rpmsg = dev_get_drvdata(cpu_dai->dev);
+
+	/*
+	 * NON-MMAP mode, NONBLOCK, Version 2, enable lpa in dts
+	 * four conditions to determine the lpa is enabled.
+	 */
+	if ((runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
+	     runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) &&
+	     rpmsg->enable_lpa) {
+		/*
+		 * Ignore suspend operation in low power mode
+		 * M core will continue playback music on A core suspend.
+		 */
+		rtd->dai_link->ignore_suspend = 1;
+		rpmsg->force_lpa = 1;
+	} else {
+		rpmsg->force_lpa = 0;
+	}
+
+	return 0;
+}
+
+static void imx_rpmsg_pcm_dma_complete(void *arg)
+{
+	struct snd_pcm_substream *substream = arg;
+
+	snd_pcm_period_elapsed(substream);
+}
+
+static int imx_rpmsg_prepare_and_submit(struct snd_soc_component *component,
+					struct snd_pcm_substream *substream)
+{
+	struct rpmsg_info *info = dev_get_drvdata(component->dev);
+	struct rpmsg_msg *msg;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		msg = &info->msg[TX_BUFFER];
+		msg->s_msg.header.cmd = TX_BUFFER;
+	} else {
+		msg = &info->msg[RX_BUFFER];
+		msg->s_msg.header.cmd = RX_BUFFER;
+	}
+
+	/* Send buffer address and buffer size */
+	msg->s_msg.param.buffer_addr = substream->runtime->dma_addr;
+	msg->s_msg.param.buffer_size = snd_pcm_lib_buffer_bytes(substream);
+	msg->s_msg.param.period_size = snd_pcm_lib_period_bytes(substream);
+	msg->s_msg.param.buffer_tail = 0;
+
+	info->num_period[substream->stream] = msg->s_msg.param.buffer_size /
+					      msg->s_msg.param.period_size;
+
+	info->callback[substream->stream] = imx_rpmsg_pcm_dma_complete;
+	info->callback_param[substream->stream] = substream;
+
+	return imx_rpmsg_insert_workqueue(substream, msg, info);
+}
+
+static int imx_rpmsg_async_issue_pending(struct snd_soc_component *component,
+					 struct snd_pcm_substream *substream)
+{
+	struct rpmsg_info *info = dev_get_drvdata(component->dev);
+	struct rpmsg_msg *msg;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		msg = &info->msg[TX_START];
+		msg->s_msg.header.cmd = TX_START;
+	} else {
+		msg = &info->msg[RX_START];
+		msg->s_msg.header.cmd = RX_START;
+	}
+
+	return imx_rpmsg_insert_workqueue(substream, msg, info);
+}
+
+static int imx_rpmsg_restart(struct snd_soc_component *component,
+			     struct snd_pcm_substream *substream)
+{
+	struct rpmsg_info *info = dev_get_drvdata(component->dev);
+	struct rpmsg_msg *msg;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		msg = &info->msg[TX_RESTART];
+		msg->s_msg.header.cmd = TX_RESTART;
+	} else {
+		msg = &info->msg[RX_RESTART];
+		msg->s_msg.header.cmd = RX_RESTART;
+	}
+
+	return imx_rpmsg_insert_workqueue(substream, msg, info);
+}
+
+static int imx_rpmsg_pause(struct snd_soc_component *component,
+			   struct snd_pcm_substream *substream)
+{
+	struct rpmsg_info *info = dev_get_drvdata(component->dev);
+	struct rpmsg_msg *msg;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		msg = &info->msg[TX_PAUSE];
+		msg->s_msg.header.cmd = TX_PAUSE;
+	} else {
+		msg = &info->msg[RX_PAUSE];
+		msg->s_msg.header.cmd = RX_PAUSE;
+	}
+
+	return imx_rpmsg_insert_workqueue(substream, msg, info);
+}
+
+static int imx_rpmsg_terminate_all(struct snd_soc_component *component,
+				   struct snd_pcm_substream *substream)
+{
+	struct rpmsg_info *info = dev_get_drvdata(component->dev);
+	struct rpmsg_msg *msg;
+	int cmd;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		msg = &info->msg[TX_TERMINATE];
+		msg->s_msg.header.cmd = TX_TERMINATE;
+		/* Clear buffer count*/
+		cmd = TX_PERIOD_DONE + MSG_TYPE_A_NUM;
+		info->msg[cmd].s_msg.param.buffer_tail = 0;
+		info->msg[cmd].r_msg.param.buffer_tail = 0;
+		info->msg[TX_POINTER].r_msg.param.buffer_offset = 0;
+	} else {
+		msg = &info->msg[RX_TERMINATE];
+		msg->s_msg.header.cmd = RX_TERMINATE;
+		/* Clear buffer count*/
+		cmd = RX_PERIOD_DONE + MSG_TYPE_A_NUM;
+		info->msg[cmd].s_msg.param.buffer_tail = 0;
+		info->msg[cmd].r_msg.param.buffer_tail = 0;
+		info->msg[RX_POINTER].r_msg.param.buffer_offset = 0;
+	}
+
+	del_timer(&info->stream_timer[substream->stream].timer);
+
+	return imx_rpmsg_insert_workqueue(substream, msg, info);
+}
+
+static int imx_rpmsg_pcm_trigger(struct snd_soc_component *component,
+				 struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
+	struct fsl_rpmsg *rpmsg = dev_get_drvdata(cpu_dai->dev);
+	int ret = 0;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		ret = imx_rpmsg_prepare_and_submit(component, substream);
+		if (ret)
+			return ret;
+		ret = imx_rpmsg_async_issue_pending(component, substream);
+		break;
+	case SNDRV_PCM_TRIGGER_RESUME:
+		if (rpmsg->force_lpa)
+			break;
+		fallthrough;
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		ret = imx_rpmsg_restart(component, substream);
+		break;
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+		if (!rpmsg->force_lpa) {
+			if (runtime->info & SNDRV_PCM_INFO_PAUSE)
+				ret = imx_rpmsg_pause(component, substream);
+			else
+				ret = imx_rpmsg_terminate_all(component, substream);
+		}
+		break;
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		ret = imx_rpmsg_pause(component, substream);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+		ret = imx_rpmsg_terminate_all(component, substream);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+/*
+ * imx_rpmsg_pcm_ack
+ *
+ * Send the period index to M core through rpmsg, but not send
+ * all the period index to M core, reduce some unnessesary msg
+ * to reduce the pressure of rpmsg bandwidth.
+ */
+static int imx_rpmsg_pcm_ack(struct snd_soc_component *component,
+			     struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
+	struct fsl_rpmsg *rpmsg = dev_get_drvdata(cpu_dai->dev);
+	struct rpmsg_info *info = dev_get_drvdata(component->dev);
+	snd_pcm_uframes_t period_size = runtime->period_size;
+	snd_pcm_sframes_t avail;
+	struct timer_list *timer;
+	struct rpmsg_msg *msg;
+	unsigned long flags;
+	int buffer_tail = 0;
+	int written_num;
+
+	if (!rpmsg->force_lpa)
+		return 0;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		msg = &info->msg[TX_PERIOD_DONE + MSG_TYPE_A_NUM];
+		msg->s_msg.header.cmd = TX_PERIOD_DONE;
+	} else {
+		msg = &info->msg[RX_PERIOD_DONE + MSG_TYPE_A_NUM];
+		msg->s_msg.header.cmd = RX_PERIOD_DONE;
+	}
+
+	msg->s_msg.header.type = MSG_TYPE_C;
+
+	buffer_tail = (frames_to_bytes(runtime, runtime->control->appl_ptr) %
+		       snd_pcm_lib_buffer_bytes(substream));
+	buffer_tail = buffer_tail / snd_pcm_lib_period_bytes(substream);
+
+	/* There is update for period index */
+	if (buffer_tail != msg->s_msg.param.buffer_tail) {
+		written_num = buffer_tail - msg->s_msg.param.buffer_tail;
+		if (written_num < 0)
+			written_num += runtime->periods;
+
+		msg->s_msg.param.buffer_tail = buffer_tail;
+
+		/* The notification message is updated to latest */
+		spin_lock_irqsave(&info->lock[substream->stream], flags);
+		memcpy(&info->notify[substream->stream], msg,
+		       sizeof(struct rpmsg_s_msg));
+		info->notify_updated[substream->stream] = true;
+		spin_unlock_irqrestore(&info->lock[substream->stream], flags);
+
+		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+			avail = snd_pcm_playback_hw_avail(runtime);
+		else
+			avail = snd_pcm_capture_hw_avail(runtime);
+
+		timer = &info->stream_timer[substream->stream].timer;
+		/*
+		 * If the data in the buffer is less than one period before
+		 * this fill, which means the data may not enough on M
+		 * core side, we need to send message immediately to let
+		 * M core know the pointer is updated.
+		 * if there is more than one period data in the buffer before
+		 * this fill, which means the data is enough on M core side,
+		 * we can delay one period (using timer) to send the message
+		 * for reduce the message number in workqueue, because the
+		 * pointer may be updated by ack function later, we can
+		 * send latest pointer to M core side.
+		 */
+		if ((avail - written_num * period_size) <= period_size) {
+			imx_rpmsg_insert_workqueue(substream, msg, info);
+		} else if (rpmsg->force_lpa && !timer_pending(timer)) {
+			int time_msec;
+
+			time_msec = (int)(runtime->period_size * 1000 / runtime->rate);
+			mod_timer(timer, jiffies + msecs_to_jiffies(time_msec));
+		}
+	}
+
+	return 0;
+}
+
+static int imx_rpmsg_pcm_new(struct snd_soc_component *component,
+			     struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_card *card = rtd->card->snd_card;
+	struct snd_pcm *pcm = rtd->pcm;
+	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
+	struct fsl_rpmsg *rpmsg = dev_get_drvdata(cpu_dai->dev);
+	int ret;
+
+	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
+	if (ret)
+		return ret;
+
+	imx_rpmsg_pcm_hardware.buffer_bytes_max = rpmsg->buffer_size;
+	return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV_WC,
+					    pcm->card->dev, rpmsg->buffer_size);
+}
+
+static const struct snd_soc_component_driver imx_rpmsg_soc_component = {
+	.name		= IMX_PCM_DRV_NAME,
+	.pcm_construct	= imx_rpmsg_pcm_new,
+	.open		= imx_rpmsg_pcm_open,
+	.close		= imx_rpmsg_pcm_close,
+	.hw_params	= imx_rpmsg_pcm_hw_params,
+	.trigger	= imx_rpmsg_pcm_trigger,
+	.pointer	= imx_rpmsg_pcm_pointer,
+	.ack		= imx_rpmsg_pcm_ack,
+	.prepare	= imx_rpmsg_pcm_prepare,
+};
+
+static void imx_rpmsg_pcm_work(struct work_struct *work)
+{
+	struct work_of_rpmsg *work_of_rpmsg;
+	bool is_notification = false;
+	struct rpmsg_info *info;
+	struct rpmsg_msg msg;
+	unsigned long flags;
+
+	work_of_rpmsg = container_of(work, struct work_of_rpmsg, work);
+	info = work_of_rpmsg->info;
+
+	/*
+	 * Every work in the work queue, first we check if there
+	 * is update for period is filled, because there may be not
+	 * enough data in M core side, need to let M core know
+	 * data is updated immediately.
+	 */
+	spin_lock_irqsave(&info->lock[TX], flags);
+	if (info->notify_updated[TX]) {
+		memcpy(&msg, &info->notify[TX], sizeof(struct rpmsg_s_msg));
+		info->notify_updated[TX] = false;
+		spin_unlock_irqrestore(&info->lock[TX], flags);
+		info->send_message(&msg, info);
+	} else {
+		spin_unlock_irqrestore(&info->lock[TX], flags);
+	}
+
+	spin_lock_irqsave(&info->lock[RX], flags);
+	if (info->notify_updated[RX]) {
+		memcpy(&msg, &info->notify[RX], sizeof(struct rpmsg_s_msg));
+		info->notify_updated[RX] = false;
+		spin_unlock_irqrestore(&info->lock[RX], flags);
+		info->send_message(&msg, info);
+	} else {
+		spin_unlock_irqrestore(&info->lock[RX], flags);
+	}
+
+	/* Skip the notification message for it has been processed above */
+	if (work_of_rpmsg->msg.s_msg.header.type == MSG_TYPE_C &&
+	    (work_of_rpmsg->msg.s_msg.header.cmd == TX_PERIOD_DONE ||
+	     work_of_rpmsg->msg.s_msg.header.cmd == RX_PERIOD_DONE))
+		is_notification = true;
+
+	if (!is_notification)
+		info->send_message(&work_of_rpmsg->msg, info);
+
+	/* update read index */
+	spin_lock_irqsave(&info->wq_lock, flags);
+	info->work_read_index++;
+	info->work_read_index %= WORK_MAX_NUM;
+	spin_unlock_irqrestore(&info->wq_lock, flags);
+}
+
+static int imx_rpmsg_pcm_probe(struct platform_device *pdev)
+{
+	struct snd_soc_component *component;
+	struct rpmsg_info *info;
+	int ret, i;
+
+	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, info);
+
+	info->rpdev = container_of(pdev->dev.parent, struct rpmsg_device, dev);
+	info->dev = &pdev->dev;
+	/* Setup work queue */
+	info->rpmsg_wq = alloc_ordered_workqueue("rpmsg_audio",
+						 WQ_HIGHPRI |
+						 WQ_UNBOUND |
+						 WQ_FREEZABLE);
+	if (!info->rpmsg_wq) {
+		dev_err(&pdev->dev, "workqueue create failed\n");
+		return -ENOMEM;
+	}
+
+	/* Write index initialize 1, make it differ with the read index */
+	info->work_write_index = 1;
+	info->send_message = imx_rpmsg_pcm_send_message;
+
+	for (i = 0; i < WORK_MAX_NUM; i++) {
+		INIT_WORK(&info->work_list[i].work, imx_rpmsg_pcm_work);
+		info->work_list[i].info = info;
+	}
+
+	/* Initialize msg */
+	for (i = 0; i < MSG_MAX_NUM; i++) {
+		info->msg[i].s_msg.header.cate  = IMX_RPMSG_AUDIO;
+		info->msg[i].s_msg.header.major = IMX_RMPSG_MAJOR;
+		info->msg[i].s_msg.header.minor = IMX_RMPSG_MINOR;
+		info->msg[i].s_msg.header.type  = MSG_TYPE_A;
+		info->msg[i].s_msg.param.audioindex = 0;
+	}
+
+	init_completion(&info->cmd_complete);
+	mutex_init(&info->msg_lock);
+	spin_lock_init(&info->lock[TX]);
+	spin_lock_init(&info->lock[RX]);
+	spin_lock_init(&info->wq_lock);
+
+	ret = devm_snd_soc_register_component(&pdev->dev,
+					      &imx_rpmsg_soc_component,
+					      NULL, 0);
+	if (ret)
+		goto fail;
+
+	component = snd_soc_lookup_component(&pdev->dev, IMX_PCM_DRV_NAME);
+	if (!component) {
+		ret = -EINVAL;
+		goto fail;
+	}
+#ifdef CONFIG_DEBUG_FS
+	component->debugfs_prefix = "rpmsg";
+#endif
+
+	return 0;
+
+fail:
+	if (info->rpmsg_wq)
+		destroy_workqueue(info->rpmsg_wq);
+
+	return ret;
+}
+
+static int imx_rpmsg_pcm_remove(struct platform_device *pdev)
+{
+	struct rpmsg_info *info = platform_get_drvdata(pdev);
+
+	if (info->rpmsg_wq)
+		destroy_workqueue(info->rpmsg_wq);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int imx_rpmsg_pcm_runtime_resume(struct device *dev)
+{
+	struct rpmsg_info *info = dev_get_drvdata(dev);
+
+	cpu_latency_qos_add_request(&info->pm_qos_req, 0);
+
+	return 0;
+}
+
+static int imx_rpmsg_pcm_runtime_suspend(struct device *dev)
+{
+	struct rpmsg_info *info = dev_get_drvdata(dev);
+
+	cpu_latency_qos_remove_request(&info->pm_qos_req);
+
+	return 0;
+}
+#endif
+
+#ifdef CONFIG_PM_SLEEP
+static int imx_rpmsg_pcm_suspend(struct device *dev)
+{
+	struct rpmsg_info *info = dev_get_drvdata(dev);
+	struct rpmsg_msg *rpmsg_tx;
+	struct rpmsg_msg *rpmsg_rx;
+
+	rpmsg_tx = &info->msg[TX_SUSPEND];
+	rpmsg_rx = &info->msg[RX_SUSPEND];
+
+	rpmsg_tx->s_msg.header.cmd = TX_SUSPEND;
+	info->send_message(rpmsg_tx, info);
+
+	rpmsg_rx->s_msg.header.cmd = RX_SUSPEND;
+	info->send_message(rpmsg_rx, info);
+
+	return 0;
+}
+
+static int imx_rpmsg_pcm_resume(struct device *dev)
+{
+	struct rpmsg_info *info = dev_get_drvdata(dev);
+	struct rpmsg_msg *rpmsg_tx;
+	struct rpmsg_msg *rpmsg_rx;
+
+	rpmsg_tx = &info->msg[TX_RESUME];
+	rpmsg_rx = &info->msg[RX_RESUME];
+
+	rpmsg_tx->s_msg.header.cmd = TX_RESUME;
+	info->send_message(rpmsg_tx, info);
+
+	rpmsg_rx->s_msg.header.cmd = RX_RESUME;
+	info->send_message(rpmsg_rx, info);
+
+	return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct dev_pm_ops imx_rpmsg_pcm_pm_ops = {
+	SET_RUNTIME_PM_OPS(imx_rpmsg_pcm_runtime_suspend,
+			   imx_rpmsg_pcm_runtime_resume,
+			   NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(imx_rpmsg_pcm_suspend,
+				imx_rpmsg_pcm_resume)
+};
+
+static struct platform_driver imx_pcm_rpmsg_driver = {
+	.probe  = imx_rpmsg_pcm_probe,
+	.remove	= imx_rpmsg_pcm_remove,
+	.driver = {
+		.name = IMX_PCM_DRV_NAME,
+		.pm = &imx_rpmsg_pcm_pm_ops,
+	},
+};
+module_platform_driver(imx_pcm_rpmsg_driver);
+
+MODULE_DESCRIPTION("Freescale SoC Audio RPMSG PCM interface");
+MODULE_AUTHOR("Shengjiu Wang <shengjiu.wang@nxp.com>");
+MODULE_ALIAS("platform:" IMX_PCM_DRV_NAME);
+MODULE_LICENSE("GPL v2");