391 lines
11 KiB
C
391 lines
11 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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//
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// Freescale ASRC ALSA SoC Platform (DMA) driver
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//
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// Copyright (C) 2014 Freescale Semiconductor, Inc.
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//
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// Author: Nicolin Chen <nicoleotsuka@gmail.com>
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#include <linux/dma-mapping.h>
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#include <linux/module.h>
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#include <linux/platform_data/dma-imx.h>
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#include <sound/dmaengine_pcm.h>
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#include <sound/pcm_params.h>
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#include "fsl_asrc.h"
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#define FSL_ASRC_DMABUF_SIZE (256 * 1024)
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static const struct snd_pcm_hardware snd_imx_hardware = {
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.info = SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_PAUSE |
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SNDRV_PCM_INFO_RESUME,
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.buffer_bytes_max = FSL_ASRC_DMABUF_SIZE,
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.period_bytes_min = 128,
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.period_bytes_max = 65535, /* Limited by SDMA engine */
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.periods_min = 2,
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.periods_max = 255,
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.fifo_size = 0,
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};
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static bool filter(struct dma_chan *chan, void *param)
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{
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if (!imx_dma_is_general_purpose(chan))
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return false;
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chan->private = param;
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return true;
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}
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static void fsl_asrc_dma_complete(void *arg)
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{
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struct snd_pcm_substream *substream = arg;
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct fsl_asrc_pair *pair = runtime->private_data;
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pair->pos += snd_pcm_lib_period_bytes(substream);
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if (pair->pos >= snd_pcm_lib_buffer_bytes(substream))
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pair->pos = 0;
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snd_pcm_period_elapsed(substream);
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}
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static int fsl_asrc_dma_prepare_and_submit(struct snd_pcm_substream *substream)
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{
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u8 dir = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? OUT : IN;
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct fsl_asrc_pair *pair = runtime->private_data;
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struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
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struct device *dev = component->dev;
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unsigned long flags = DMA_CTRL_ACK;
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/* Prepare and submit Front-End DMA channel */
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if (!substream->runtime->no_period_wakeup)
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flags |= DMA_PREP_INTERRUPT;
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pair->pos = 0;
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pair->desc[!dir] = dmaengine_prep_dma_cyclic(
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pair->dma_chan[!dir], runtime->dma_addr,
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snd_pcm_lib_buffer_bytes(substream),
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snd_pcm_lib_period_bytes(substream),
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dir == OUT ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM, flags);
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if (!pair->desc[!dir]) {
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dev_err(dev, "failed to prepare slave DMA for Front-End\n");
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return -ENOMEM;
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}
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pair->desc[!dir]->callback = fsl_asrc_dma_complete;
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pair->desc[!dir]->callback_param = substream;
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dmaengine_submit(pair->desc[!dir]);
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/* Prepare and submit Back-End DMA channel */
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pair->desc[dir] = dmaengine_prep_dma_cyclic(
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pair->dma_chan[dir], 0xffff, 64, 64, DMA_DEV_TO_DEV, 0);
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if (!pair->desc[dir]) {
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dev_err(dev, "failed to prepare slave DMA for Back-End\n");
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return -ENOMEM;
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}
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dmaengine_submit(pair->desc[dir]);
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return 0;
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}
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static int fsl_asrc_dma_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct fsl_asrc_pair *pair = runtime->private_data;
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int ret;
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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case SNDRV_PCM_TRIGGER_RESUME:
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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ret = fsl_asrc_dma_prepare_and_submit(substream);
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if (ret)
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return ret;
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dma_async_issue_pending(pair->dma_chan[IN]);
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dma_async_issue_pending(pair->dma_chan[OUT]);
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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case SNDRV_PCM_TRIGGER_SUSPEND:
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
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dmaengine_terminate_all(pair->dma_chan[OUT]);
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dmaengine_terminate_all(pair->dma_chan[IN]);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int fsl_asrc_dma_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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enum dma_slave_buswidth buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
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struct snd_dmaengine_dai_dma_data *dma_params_fe = NULL;
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struct snd_dmaengine_dai_dma_data *dma_params_be = NULL;
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struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct fsl_asrc_pair *pair = runtime->private_data;
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struct fsl_asrc *asrc_priv = pair->asrc_priv;
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struct dma_slave_config config_fe, config_be;
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enum asrc_pair_index index = pair->index;
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struct device *dev = component->dev;
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int stream = substream->stream;
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struct imx_dma_data *tmp_data;
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struct snd_soc_dpcm *dpcm;
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struct dma_chan *tmp_chan;
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struct device *dev_be;
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u8 dir = tx ? OUT : IN;
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dma_cap_mask_t mask;
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int ret;
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/* Fetch the Back-End dma_data from DPCM */
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list_for_each_entry(dpcm, &rtd->dpcm[stream].be_clients, list_be) {
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struct snd_soc_pcm_runtime *be = dpcm->be;
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struct snd_pcm_substream *substream_be;
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struct snd_soc_dai *dai = be->cpu_dai;
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if (dpcm->fe != rtd)
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continue;
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substream_be = snd_soc_dpcm_get_substream(be, stream);
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dma_params_be = snd_soc_dai_get_dma_data(dai, substream_be);
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dev_be = dai->dev;
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break;
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}
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if (!dma_params_be) {
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dev_err(dev, "failed to get the substream of Back-End\n");
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return -EINVAL;
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}
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/* Override dma_data of the Front-End and config its dmaengine */
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dma_params_fe = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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dma_params_fe->addr = asrc_priv->paddr + REG_ASRDx(!dir, index);
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dma_params_fe->maxburst = dma_params_be->maxburst;
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pair->dma_chan[!dir] = fsl_asrc_get_dma_channel(pair, !dir);
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if (!pair->dma_chan[!dir]) {
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dev_err(dev, "failed to request DMA channel\n");
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return -EINVAL;
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}
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memset(&config_fe, 0, sizeof(config_fe));
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ret = snd_dmaengine_pcm_prepare_slave_config(substream, params, &config_fe);
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if (ret) {
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dev_err(dev, "failed to prepare DMA config for Front-End\n");
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return ret;
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}
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ret = dmaengine_slave_config(pair->dma_chan[!dir], &config_fe);
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if (ret) {
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dev_err(dev, "failed to config DMA channel for Front-End\n");
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return ret;
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}
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/* Request and config DMA channel for Back-End */
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dma_cap_zero(mask);
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dma_cap_set(DMA_SLAVE, mask);
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dma_cap_set(DMA_CYCLIC, mask);
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/* Get DMA request of Back-End */
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tmp_chan = dma_request_slave_channel(dev_be, tx ? "tx" : "rx");
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tmp_data = tmp_chan->private;
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pair->dma_data.dma_request = tmp_data->dma_request;
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dma_release_channel(tmp_chan);
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/* Get DMA request of Front-End */
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tmp_chan = fsl_asrc_get_dma_channel(pair, dir);
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tmp_data = tmp_chan->private;
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pair->dma_data.dma_request2 = tmp_data->dma_request;
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pair->dma_data.peripheral_type = tmp_data->peripheral_type;
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pair->dma_data.priority = tmp_data->priority;
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dma_release_channel(tmp_chan);
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pair->dma_chan[dir] = dma_request_channel(mask, filter, &pair->dma_data);
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if (!pair->dma_chan[dir]) {
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dev_err(dev, "failed to request DMA channel for Back-End\n");
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return -EINVAL;
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}
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if (asrc_priv->asrc_width == 16)
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buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
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else
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buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
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config_be.direction = DMA_DEV_TO_DEV;
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config_be.src_addr_width = buswidth;
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config_be.src_maxburst = dma_params_be->maxburst;
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config_be.dst_addr_width = buswidth;
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config_be.dst_maxburst = dma_params_be->maxburst;
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if (tx) {
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config_be.src_addr = asrc_priv->paddr + REG_ASRDO(index);
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config_be.dst_addr = dma_params_be->addr;
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} else {
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config_be.dst_addr = asrc_priv->paddr + REG_ASRDI(index);
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config_be.src_addr = dma_params_be->addr;
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}
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ret = dmaengine_slave_config(pair->dma_chan[dir], &config_be);
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if (ret) {
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dev_err(dev, "failed to config DMA channel for Back-End\n");
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dma_release_channel(pair->dma_chan[dir]);
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return ret;
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}
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snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
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return 0;
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}
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static int fsl_asrc_dma_hw_free(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct fsl_asrc_pair *pair = runtime->private_data;
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snd_pcm_set_runtime_buffer(substream, NULL);
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if (pair->dma_chan[IN])
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dma_release_channel(pair->dma_chan[IN]);
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if (pair->dma_chan[OUT])
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dma_release_channel(pair->dma_chan[OUT]);
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pair->dma_chan[IN] = NULL;
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pair->dma_chan[OUT] = NULL;
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return 0;
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}
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static int fsl_asrc_dma_startup(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
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struct device *dev = component->dev;
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struct fsl_asrc *asrc_priv = dev_get_drvdata(dev);
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struct fsl_asrc_pair *pair;
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pair = kzalloc(sizeof(struct fsl_asrc_pair), GFP_KERNEL);
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if (!pair)
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return -ENOMEM;
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pair->asrc_priv = asrc_priv;
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runtime->private_data = pair;
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snd_pcm_hw_constraint_integer(substream->runtime,
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SNDRV_PCM_HW_PARAM_PERIODS);
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snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
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return 0;
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}
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static int fsl_asrc_dma_shutdown(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct fsl_asrc_pair *pair = runtime->private_data;
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struct fsl_asrc *asrc_priv;
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if (!pair)
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return 0;
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asrc_priv = pair->asrc_priv;
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if (asrc_priv->pair[pair->index] == pair)
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asrc_priv->pair[pair->index] = NULL;
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kfree(pair);
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return 0;
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}
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static snd_pcm_uframes_t fsl_asrc_dma_pcm_pointer(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct fsl_asrc_pair *pair = runtime->private_data;
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return bytes_to_frames(substream->runtime, pair->pos);
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}
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static const struct snd_pcm_ops fsl_asrc_dma_pcm_ops = {
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = fsl_asrc_dma_hw_params,
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.hw_free = fsl_asrc_dma_hw_free,
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.trigger = fsl_asrc_dma_trigger,
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.open = fsl_asrc_dma_startup,
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.close = fsl_asrc_dma_shutdown,
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.pointer = fsl_asrc_dma_pcm_pointer,
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};
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static int fsl_asrc_dma_pcm_new(struct snd_soc_pcm_runtime *rtd)
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{
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struct snd_card *card = rtd->card->snd_card;
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struct snd_pcm_substream *substream;
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struct snd_pcm *pcm = rtd->pcm;
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int ret, i;
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ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
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if (ret) {
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dev_err(card->dev, "failed to set DMA mask\n");
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return ret;
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}
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for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_LAST; i++) {
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substream = pcm->streams[i].substream;
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||
|
|
if (!substream)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
|
||
|
|
FSL_ASRC_DMABUF_SIZE, &substream->dma_buffer);
|
||
|
|
if (ret) {
|
||
|
|
dev_err(card->dev, "failed to allocate DMA buffer\n");
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
err:
|
||
|
|
if (--i == 0 && pcm->streams[i].substream)
|
||
|
|
snd_dma_free_pages(&pcm->streams[i].substream->dma_buffer);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void fsl_asrc_dma_pcm_free(struct snd_pcm *pcm)
|
||
|
|
{
|
||
|
|
struct snd_pcm_substream *substream;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_LAST; i++) {
|
||
|
|
substream = pcm->streams[i].substream;
|
||
|
|
if (!substream)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
snd_dma_free_pages(&substream->dma_buffer);
|
||
|
|
substream->dma_buffer.area = NULL;
|
||
|
|
substream->dma_buffer.addr = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
struct snd_soc_component_driver fsl_asrc_component = {
|
||
|
|
.name = DRV_NAME,
|
||
|
|
.ops = &fsl_asrc_dma_pcm_ops,
|
||
|
|
.pcm_new = fsl_asrc_dma_pcm_new,
|
||
|
|
.pcm_free = fsl_asrc_dma_pcm_free,
|
||
|
|
};
|
||
|
|
EXPORT_SYMBOL_GPL(fsl_asrc_component);
|