--- /dev/null
+/*
+ * 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");
projects / linux.git / commitdiff