diff options
Diffstat (limited to 'sound/soc/fsl/imx-pcm-rpmsg.c')
| -rw-r--r-- | sound/soc/fsl/imx-pcm-rpmsg.c | 918 |
1 files changed, 918 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..875c0d6df339 --- /dev/null +++ b/sound/soc/fsl/imx-pcm-rpmsg.c @@ -0,0 +1,918 @@ +// 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 = SNDRV_PCM_FORMAT_DSD_U16_LE; + break; + case SNDRV_PCM_FORMAT_DSD_U32_LE: + msg->s_msg.param.format = SNDRV_PCM_FORMAT_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 = 0; + + 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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