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OpenCloudOS-Kernel/sound/soc/fsl/imx-pcm-rpmsg.c

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// 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_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 snd_pcm_runtime *runtime = substream->runtime;
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;
}
snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
runtime->dma_bytes = params_buffer_bytes(params);
info->send_message(msg, info);
return ret;
}
static int imx_rpmsg_pcm_hw_free(struct snd_soc_component *component,
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_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 int imx_rpmsg_pcm_mmap(struct snd_soc_component *component,
struct snd_pcm_substream *substream,
struct vm_area_struct *vma)
{
struct snd_pcm_runtime *runtime = substream->runtime;
return dma_mmap_wc(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;
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_preallocate_dma_buffer(struct snd_pcm *pcm,
int stream, int size)
{
struct snd_pcm_substream *substream = pcm->streams[stream].substream;
struct snd_dma_buffer *buf = &substream->dma_buffer;
buf->dev.type = SNDRV_DMA_TYPE_DEV;
buf->dev.dev = pcm->card->dev;
buf->private_data = NULL;
buf->area = dma_alloc_wc(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_soc_component *component,
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_wc(pcm->card->dev, buf->bytes,
buf->area, buf->addr);
buf->area = NULL;
}
}
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;
if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
ret = imx_rpmsg_pcm_preallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK,
rpmsg->buffer_size);
if (ret)
goto out;
}
if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
ret = imx_rpmsg_pcm_preallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_CAPTURE,
rpmsg->buffer_size);
if (ret)
goto out;
}
imx_rpmsg_pcm_hardware.buffer_bytes_max = rpmsg->buffer_size;
out:
/* free preallocated buffers in case of error */
if (ret)
imx_rpmsg_pcm_free_dma_buffers(component, pcm);
return ret;
}
static const struct snd_soc_component_driver imx_rpmsg_soc_component = {
.name = IMX_PCM_DRV_NAME,
.pcm_construct = imx_rpmsg_pcm_new,
.pcm_destruct = imx_rpmsg_pcm_free_dma_buffers,
.open = imx_rpmsg_pcm_open,
.close = imx_rpmsg_pcm_close,
.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,
.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");
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