MLK-13904-2: ASoC: fsl: add audio platform driver base on rpmsg

Add platform driver, each step like set hw param, trigger start
trigger stop, and so on, will call the rpmsg api.

Signed-off-by: Shengjiu Wang <shengjiu.wang@freescale.com>
Acked-by: Robin Gong <yibin.gong@nxp.com>
[Aisheng: clean for a new base ]
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>

1 files changed, 514 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 000000000000..25369cc0fade
--- /dev/null
+++ b/sound/soc/fsl/imx-pcm-rpmsg.c
@@ -0,0 +1,514 @@
+/*
+ * imx-rpmsg-platform.c  --  ALSA Soc Audio Layer
+ *
+ * Copyright 2017 NXP
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/rpmsg.h>
+#include <linux/imx_rpmsg.h>
+#include <linux/delay.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_i2s.h"
+
+struct i2s_info *i2s_info_g;
+
+static const struct snd_pcm_hardware imx_rpmsg_pcm_hardware = {
+	.info = SNDRV_PCM_INFO_INTERLEAVED |
+		SNDRV_PCM_INFO_BLOCK_TRANSFER |
+		SNDRV_PCM_INFO_MMAP |
+		SNDRV_PCM_INFO_MMAP_VALID |
+		SNDRV_PCM_INFO_PAUSE |
+		SNDRV_PCM_INFO_RESUME,
+	.buffer_bytes_max = IMX_SAI_DMABUF_SIZE,
+	.period_bytes_min = 128,
+	.period_bytes_max = 65535, /* Limited by SDMA engine */
+	.periods_min = 2,
+	.periods_max = 255,
+	.fifo_size = 0,
+};
+
+static int imx_rpmsg_pcm_hw_params(struct snd_pcm_substream *substream,
+			      struct snd_pcm_hw_params *params)
+{
+
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+	struct fsl_rpmsg_i2s *rpmsg_i2s = dev_get_drvdata(cpu_dai->dev);
+	struct i2s_info  *i2s_info =  &rpmsg_i2s->i2s_info;
+	struct i2s_rpmsg_s *rpmsg = &i2s_info->send_msg[substream->stream];
+
+	rpmsg->param.rate     = params_rate(params);
+	if (SNDRV_PCM_FORMAT_S16_LE ==  params_format(params))
+		rpmsg->param.format   = 0;
+	else
+		rpmsg->param.format   = 1;
+
+	if (params_channels(params) == 1)
+		rpmsg->param.channels = 0;
+	else
+		rpmsg->param.channels = 2;
+
+	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+	runtime->dma_bytes = params_buffer_bytes(params);
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		rpmsg->header.cmd = I2S_TX_HW_PARAM;
+	else
+		rpmsg->header.cmd = I2S_RX_HW_PARAM;
+
+	i2s_info->send_message(rpmsg, i2s_info);
+
+	return 0;
+}
+
+static int imx_rpmsg_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+	snd_pcm_set_runtime_buffer(substream, NULL);
+	return 0;
+}
+
+static snd_pcm_uframes_t imx_rpmsg_pcm_pointer(
+				struct snd_pcm_substream *substream)
+{
+	struct dma_tx_state state;
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai   *cpu_dai = rtd->cpu_dai;
+	struct fsl_rpmsg_i2s *rpmsg_i2s = dev_get_drvdata(cpu_dai->dev);
+	struct i2s_info      *i2s_info =  &rpmsg_i2s->i2s_info;
+	struct i2s_rpmsg_s   *rpmsg = &i2s_info->send_msg[substream->stream];
+	unsigned int buf_size;
+	unsigned int pos = 0;
+	unsigned long flags;
+
+	spin_lock_irqsave(&i2s_info->lock[substream->stream], flags);
+	state.residue = (i2s_info->num_period[substream->stream] -
+				  rpmsg->param.buffer_tail)
+				* rpmsg->param.period_size;
+	spin_unlock_irqrestore(&i2s_info->lock[substream->stream], flags);
+
+	buf_size = snd_pcm_lib_buffer_bytes(substream);
+	if (state.residue > 0 && state.residue <= buf_size)
+		pos = buf_size - state.residue;
+
+	return bytes_to_frames(substream->runtime, pos);
+}
+
+static int imx_rpmsg_pcm_open(struct snd_pcm_substream *substream)
+{
+	int ret = 0;
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai   *cpu_dai = rtd->cpu_dai;
+	struct fsl_rpmsg_i2s *rpmsg_i2s = dev_get_drvdata(cpu_dai->dev);
+	struct i2s_info      *i2s_info =  &rpmsg_i2s->i2s_info;
+	struct i2s_rpmsg_s   *rpmsg = &i2s_info->send_msg[substream->stream];
+	struct dmaengine_pcm_runtime_data *prtd;
+
+	snd_soc_set_runtime_hwparams(substream, &imx_rpmsg_pcm_hardware);
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		rpmsg->header.cmd = I2S_TX_OPEN;
+	else
+		rpmsg->header.cmd = I2S_RX_OPEN;
+	i2s_info->send_message(rpmsg, i2s_info);
+
+	prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
+	if (!prtd)
+		return -ENOMEM;
+
+	substream->runtime->private_data = prtd;
+
+	return ret;
+}
+
+static int imx_rpmsg_pcm_close(struct snd_pcm_substream *substream)
+{
+	int ret = 0;
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai   *cpu_dai = rtd->cpu_dai;
+	struct fsl_rpmsg_i2s *rpmsg_i2s = dev_get_drvdata(cpu_dai->dev);
+	struct i2s_info      *i2s_info =  &rpmsg_i2s->i2s_info;
+	struct i2s_rpmsg_s   *rpmsg = &i2s_info->send_msg[substream->stream];
+	struct dmaengine_pcm_runtime_data *prtd =
+					substream->runtime->private_data;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		rpmsg->header.cmd = I2S_TX_CLOSE;
+	else
+		rpmsg->header.cmd = I2S_RX_CLOSE;
+	i2s_info->send_message(rpmsg, i2s_info);
+
+	kfree(prtd);
+
+	return ret;
+}
+
+static int imx_rpmsg_pcm_mmap(struct snd_pcm_substream *substream,
+	struct vm_area_struct *vma)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+
+	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
+				     runtime->dma_area,
+				     runtime->dma_addr,
+				     runtime->dma_bytes);
+}
+
+static void imx_rpmsg_pcm_dma_complete(void *arg)
+{
+	struct snd_pcm_substream *substream = arg;
+	struct dmaengine_pcm_runtime_data *prtd
+					= substream->runtime->private_data;
+
+	prtd->pos += snd_pcm_lib_period_bytes(substream);
+	if (prtd->pos >= snd_pcm_lib_buffer_bytes(substream))
+		prtd->pos = 0;
+
+	snd_pcm_period_elapsed(substream);
+}
+
+static int imx_rpmsg_pcm_prepare_and_submit(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai   *cpu_dai = rtd->cpu_dai;
+	struct fsl_rpmsg_i2s *rpmsg_i2s = dev_get_drvdata(cpu_dai->dev);
+	struct i2s_info      *i2s_info =  &rpmsg_i2s->i2s_info;
+	struct i2s_rpmsg_s   *rpmsg = &i2s_info->send_msg[substream->stream];
+	u8 cmd;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		cmd = I2S_TX_BUFFER;
+	else
+		cmd = I2S_RX_BUFFER;
+
+	rpmsg->header.cmd = cmd;
+	rpmsg->param.buffer_addr    =  substream->runtime->dma_addr;
+	rpmsg->param.buffer_size    =  snd_pcm_lib_buffer_bytes(substream);
+	rpmsg->param.period_size    =  snd_pcm_lib_period_bytes(substream);
+	rpmsg->param.buffer_tail    = 0;
+
+	i2s_info->num_period[substream->stream] =
+			rpmsg->param.buffer_size/rpmsg->param.period_size;
+
+	memcpy(&i2s_info->work_list[cmd].msg, rpmsg,
+						sizeof(struct i2s_rpmsg_s));
+	queue_work(i2s_info->rpmsg_wq, &i2s_info->work_list[cmd].work);
+
+	i2s_info->callback[substream->stream] = imx_rpmsg_pcm_dma_complete;
+	i2s_info->callback_param[substream->stream] = substream;
+	return 0;
+}
+
+static void imx_rpmsg_async_issue_pending(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai   *cpu_dai = rtd->cpu_dai;
+	struct fsl_rpmsg_i2s *rpmsg_i2s = dev_get_drvdata(cpu_dai->dev);
+	struct i2s_info      *i2s_info =  &rpmsg_i2s->i2s_info;
+	struct i2s_rpmsg_s   *rpmsg = &i2s_info->send_msg[substream->stream];
+	u8 cmd;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		cmd = I2S_TX_START;
+	else
+		cmd = I2S_RX_START;
+
+	rpmsg->header.cmd = cmd;
+	memcpy(&i2s_info->work_list[cmd].msg, rpmsg,
+						sizeof(struct i2s_rpmsg_s));
+	queue_work(i2s_info->rpmsg_wq, &i2s_info->work_list[cmd].work);
+}
+
+static int imx_rpmsg_resume(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai         *cpu_dai = rtd->cpu_dai;
+	struct fsl_rpmsg_i2s       *rpmsg_i2s = dev_get_drvdata(cpu_dai->dev);
+	struct i2s_info            *i2s_info =  &rpmsg_i2s->i2s_info;
+	struct i2s_rpmsg_s     *rpmsg = &i2s_info->send_msg[substream->stream];
+	u8 cmd;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		cmd = I2S_TX_RESTART;
+	else
+		cmd = I2S_RX_RESTART;
+
+	rpmsg->header.cmd = cmd;
+	memcpy(&i2s_info->work_list[cmd].msg, rpmsg,
+						sizeof(struct i2s_rpmsg_s));
+	queue_work(i2s_info->rpmsg_wq, &i2s_info->work_list[cmd].work);
+
+	return 0;
+}
+
+static int imx_rpmsg_pause(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai         *cpu_dai = rtd->cpu_dai;
+	struct fsl_rpmsg_i2s       *rpmsg_i2s = dev_get_drvdata(cpu_dai->dev);
+	struct i2s_info            *i2s_info =  &rpmsg_i2s->i2s_info;
+	struct i2s_rpmsg_s     *rpmsg = &i2s_info->send_msg[substream->stream];
+	u8 cmd;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		cmd = I2S_TX_PAUSE;
+	else
+		cmd = I2S_RX_PAUSE;
+
+	rpmsg->header.cmd = cmd;
+	memcpy(&i2s_info->work_list[cmd].msg, rpmsg,
+						sizeof(struct i2s_rpmsg_s));
+	queue_work(i2s_info->rpmsg_wq, &i2s_info->work_list[cmd].work);
+
+	return 0;
+}
+
+static int imx_rpmsg_terminate_all(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai         *cpu_dai = rtd->cpu_dai;
+	struct fsl_rpmsg_i2s       *rpmsg_i2s = dev_get_drvdata(cpu_dai->dev);
+	struct i2s_info            *i2s_info =  &rpmsg_i2s->i2s_info;
+	struct i2s_rpmsg_s     *rpmsg = &i2s_info->send_msg[substream->stream];
+	u8 cmd;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		cmd = I2S_TX_TERMINATE;
+	else
+		cmd = I2S_RX_TERMINATE;
+
+	rpmsg->header.cmd = cmd;
+	memcpy(&i2s_info->work_list[cmd].msg, rpmsg,
+						sizeof(struct i2s_rpmsg_s));
+	queue_work(i2s_info->rpmsg_wq, &i2s_info->work_list[cmd].work);
+
+	return 0;
+}
+
+int imx_rpmsg_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	int ret;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		ret = imx_rpmsg_pcm_prepare_and_submit(substream);
+		if (ret)
+			return ret;
+		imx_rpmsg_async_issue_pending(substream);
+		break;
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		imx_rpmsg_resume(substream);
+		break;
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+		if (runtime->info & SNDRV_PCM_INFO_PAUSE)
+			imx_rpmsg_pause(substream);
+		else
+			imx_rpmsg_terminate_all(substream);
+		break;
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		imx_rpmsg_pause(substream);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+		imx_rpmsg_terminate_all(substream);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static struct snd_pcm_ops imx_rpmsg_pcm_ops = {
+	.open		= imx_rpmsg_pcm_open,
+	.close		= imx_rpmsg_pcm_close,
+	.ioctl		= snd_pcm_lib_ioctl,
+	.hw_params	= imx_rpmsg_pcm_hw_params,
+	.hw_free	= imx_rpmsg_pcm_hw_free,
+	.trigger	= imx_rpmsg_pcm_trigger,
+	.pointer	= imx_rpmsg_pcm_pointer,
+	.mmap		= imx_rpmsg_pcm_mmap,
+};
+
+static int imx_rpmsg_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
+	int stream)
+{
+	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
+	struct snd_dma_buffer *buf = &substream->dma_buffer;
+	size_t size = imx_rpmsg_pcm_hardware.buffer_bytes_max;
+
+	buf->dev.type = SNDRV_DMA_TYPE_DEV;
+	buf->dev.dev = pcm->card->dev;
+	buf->private_data = NULL;
+	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
+					   &buf->addr, GFP_KERNEL);
+	if (!buf->area)
+		return -ENOMEM;
+
+	buf->bytes = size;
+	return 0;
+}
+
+static void imx_rpmsg_pcm_free_dma_buffers(struct snd_pcm *pcm)
+{
+	struct snd_pcm_substream *substream;
+	struct snd_dma_buffer *buf;
+	int stream;
+
+	for (stream = SNDRV_PCM_STREAM_PLAYBACK;
+			stream < SNDRV_PCM_STREAM_LAST; stream++) {
+		substream = pcm->streams[stream].substream;
+		if (!substream)
+			continue;
+
+		buf = &substream->dma_buffer;
+		if (!buf->area)
+			continue;
+
+		dma_free_writecombine(pcm->card->dev, buf->bytes,
+				      buf->area, buf->addr);
+		buf->area = NULL;
+	}
+}
+
+static int imx_rpmsg_pcm_new(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_card *card = rtd->card->snd_card;
+	struct snd_pcm *pcm = rtd->pcm;
+	int ret;
+
+	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
+	if (ret)
+		return ret;
+
+	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
+		ret = imx_rpmsg_pcm_preallocate_dma_buffer(pcm,
+			SNDRV_PCM_STREAM_PLAYBACK);
+		if (ret)
+			goto out;
+	}
+
+	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
+		ret = imx_rpmsg_pcm_preallocate_dma_buffer(pcm,
+			SNDRV_PCM_STREAM_CAPTURE);
+		if (ret)
+			goto out;
+	}
+
+out:
+	/* free preallocated buffers in case of error */
+	if (ret)
+		imx_rpmsg_pcm_free_dma_buffers(pcm);
+
+	return ret;
+}
+
+static struct snd_soc_platform_driver imx_rpmsg_soc_platform = {
+	.ops		= &imx_rpmsg_pcm_ops,
+	.pcm_new	= imx_rpmsg_pcm_new,
+	.pcm_free	= imx_rpmsg_pcm_free_dma_buffers,
+};
+
+int imx_rpmsg_platform_register(struct device *dev)
+{
+
+	struct fsl_rpmsg_i2s  *rpmsg_i2s = dev_get_drvdata(dev);
+
+	i2s_info_g	=  &rpmsg_i2s->i2s_info;
+
+	return devm_snd_soc_register_platform(dev, &imx_rpmsg_soc_platform);
+}
+EXPORT_SYMBOL_GPL(imx_rpmsg_platform_register);
+
+static int i2s_rpmsg_cb(struct rpmsg_device *rpdev, void *data, int len,
+			void *priv, u32 src)
+{
+	struct i2s_rpmsg_r *msg = (struct i2s_rpmsg_r *)data;
+	struct i2s_rpmsg_s *rpmsg;
+	unsigned long flags;
+
+	dev_dbg(&rpdev->dev, "get from%d: cmd:%d.\n", src, msg->header.cmd);
+
+	memcpy(&i2s_info_g->recv_msg, msg, sizeof(struct i2s_rpmsg_r));
+
+	if (msg->header.type == I2S_TYPE_C) {
+		if (msg->header.cmd == I2S_TX_PERIOD_DONE) {
+			spin_lock_irqsave(&i2s_info_g->lock[0], flags);
+			rpmsg = &i2s_info_g->send_msg[0];
+			rpmsg->param.buffer_tail++;
+			rpmsg->param.buffer_tail %= i2s_info_g->num_period[0];
+			spin_unlock_irqrestore(&i2s_info_g->lock[0], flags);
+			i2s_info_g->callback[0](i2s_info_g->callback_param[0]);
+		} else if (msg->header.cmd == I2S_RX_PERIOD_DONE) {
+			spin_lock_irqsave(&i2s_info_g->lock[1], flags);
+			rpmsg = &i2s_info_g->send_msg[1];
+			rpmsg->param.buffer_tail++;
+			rpmsg->param.buffer_tail %= i2s_info_g->num_period[1];
+			spin_unlock_irqrestore(&i2s_info_g->lock[1], flags);
+			i2s_info_g->callback[1](i2s_info_g->callback_param[1]);
+		}
+	}
+
+	if (msg->header.type == I2S_TYPE_B)
+		complete(&i2s_info_g->cmd_complete);
+
+	return 0;
+}
+
+static int i2s_rpmsg_probe(struct rpmsg_device *rpdev)
+{
+	i2s_info_g->rpdev = rpdev;
+
+	init_completion(&i2s_info_g->cmd_complete);
+
+	dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n",
+			rpdev->src, rpdev->dst);
+	return 0;
+}
+
+static void i2s_rpmsg_remove(struct rpmsg_device *rpdev)
+{
+	dev_info(&rpdev->dev, "i2s rpmsg driver is removed\n");
+}
+
+static struct rpmsg_device_id i2s_rpmsg_id_table[] = {
+	{ .name	= "rpmsg-audio-channel" },
+	{ },
+};
+
+static struct rpmsg_driver i2s_rpmsg_driver = {
+	.drv.name	= "i2s_rpmsg",
+	.drv.owner	= THIS_MODULE,
+	.id_table	= i2s_rpmsg_id_table,
+	.probe		= i2s_rpmsg_probe,
+	.callback	= i2s_rpmsg_cb,
+	.remove		= i2s_rpmsg_remove,
+};
+
+static int __init i2s_rpmsg_init(void)
+{
+	return register_rpmsg_driver(&i2s_rpmsg_driver);
+}
+
+static void __exit i2s_rpmsg_exit(void)
+{
+	unregister_rpmsg_driver(&i2s_rpmsg_driver);
+}
+module_init(i2s_rpmsg_init);
+module_exit(i2s_rpmsg_exit);
+
+MODULE_LICENSE("GPL");