498 lines
13 KiB
C
498 lines
13 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2019 Spreadtrum Communications Inc.
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#include <linux/dma-mapping.h>
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#include <linux/dmaengine.h>
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#include <linux/dma/sprd-dma.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of_reserved_mem.h>
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#include <linux/platform_device.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include "sprd-pcm-dma.h"
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#define SPRD_PCM_DMA_LINKLIST_SIZE 64
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#define SPRD_PCM_DMA_BRUST_LEN 640
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struct sprd_pcm_dma_data {
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struct dma_chan *chan;
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struct dma_async_tx_descriptor *desc;
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dma_cookie_t cookie;
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dma_addr_t phys;
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void *virt;
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int pre_pointer;
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};
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struct sprd_pcm_dma_private {
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struct snd_pcm_substream *substream;
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struct sprd_pcm_dma_params *params;
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struct sprd_pcm_dma_data data[SPRD_PCM_CHANNEL_MAX];
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int hw_chan;
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int dma_addr_offset;
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};
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static const struct snd_pcm_hardware sprd_pcm_hardware = {
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.info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_PAUSE |
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SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
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.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
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.period_bytes_min = 1,
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.period_bytes_max = 64 * 1024,
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.periods_min = 1,
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.periods_max = PAGE_SIZE / SPRD_PCM_DMA_LINKLIST_SIZE,
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.buffer_bytes_max = 64 * 1024,
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};
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static int sprd_pcm_open(struct snd_soc_component *component,
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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 device *dev = component->dev;
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struct sprd_pcm_dma_private *dma_private;
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int hw_chan = SPRD_PCM_CHANNEL_MAX;
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int size, ret, i;
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snd_soc_set_runtime_hwparams(substream, &sprd_pcm_hardware);
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ret = snd_pcm_hw_constraint_step(runtime, 0,
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SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
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SPRD_PCM_DMA_BRUST_LEN);
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if (ret < 0)
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return ret;
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ret = snd_pcm_hw_constraint_step(runtime, 0,
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SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
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SPRD_PCM_DMA_BRUST_LEN);
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if (ret < 0)
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return ret;
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ret = snd_pcm_hw_constraint_integer(runtime,
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SNDRV_PCM_HW_PARAM_PERIODS);
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if (ret < 0)
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return ret;
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dma_private = devm_kzalloc(dev, sizeof(*dma_private), GFP_KERNEL);
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if (!dma_private)
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return -ENOMEM;
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size = runtime->hw.periods_max * SPRD_PCM_DMA_LINKLIST_SIZE;
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for (i = 0; i < hw_chan; i++) {
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struct sprd_pcm_dma_data *data = &dma_private->data[i];
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data->virt = dmam_alloc_coherent(dev, size, &data->phys,
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GFP_KERNEL);
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if (!data->virt) {
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ret = -ENOMEM;
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goto error;
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}
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}
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dma_private->hw_chan = hw_chan;
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runtime->private_data = dma_private;
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dma_private->substream = substream;
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return 0;
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error:
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for (i = 0; i < hw_chan; i++) {
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struct sprd_pcm_dma_data *data = &dma_private->data[i];
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if (data->virt)
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dmam_free_coherent(dev, size, data->virt, data->phys);
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}
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devm_kfree(dev, dma_private);
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return ret;
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}
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static int sprd_pcm_close(struct snd_soc_component *component,
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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 sprd_pcm_dma_private *dma_private = runtime->private_data;
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struct device *dev = component->dev;
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int size = runtime->hw.periods_max * SPRD_PCM_DMA_LINKLIST_SIZE;
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int i;
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for (i = 0; i < dma_private->hw_chan; i++) {
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struct sprd_pcm_dma_data *data = &dma_private->data[i];
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dmam_free_coherent(dev, size, data->virt, data->phys);
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}
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devm_kfree(dev, dma_private);
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return 0;
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}
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static void sprd_pcm_dma_complete(void *data)
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{
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struct sprd_pcm_dma_private *dma_private = data;
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struct snd_pcm_substream *substream = dma_private->substream;
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snd_pcm_period_elapsed(substream);
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}
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static void sprd_pcm_release_dma_channel(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 sprd_pcm_dma_private *dma_private = runtime->private_data;
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int i;
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for (i = 0; i < SPRD_PCM_CHANNEL_MAX; i++) {
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struct sprd_pcm_dma_data *data = &dma_private->data[i];
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if (data->chan) {
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dma_release_channel(data->chan);
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data->chan = NULL;
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}
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}
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}
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static int sprd_pcm_request_dma_channel(struct snd_soc_component *component,
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struct snd_pcm_substream *substream,
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int channels)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct sprd_pcm_dma_private *dma_private = runtime->private_data;
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struct device *dev = component->dev;
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struct sprd_pcm_dma_params *dma_params = dma_private->params;
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int i;
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if (channels > SPRD_PCM_CHANNEL_MAX) {
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dev_err(dev, "invalid dma channel number:%d\n", channels);
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return -EINVAL;
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}
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for (i = 0; i < channels; i++) {
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struct sprd_pcm_dma_data *data = &dma_private->data[i];
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data->chan = dma_request_slave_channel(dev,
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dma_params->chan_name[i]);
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if (!data->chan) {
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dev_err(dev, "failed to request dma channel:%s\n",
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dma_params->chan_name[i]);
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sprd_pcm_release_dma_channel(substream);
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return -ENODEV;
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}
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}
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return 0;
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}
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static int sprd_pcm_hw_params(struct snd_soc_component *component,
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struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct sprd_pcm_dma_private *dma_private = runtime->private_data;
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
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struct sprd_pcm_dma_params *dma_params;
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size_t totsize = params_buffer_bytes(params);
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size_t period = params_period_bytes(params);
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int channels = params_channels(params);
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int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
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struct scatterlist *sg;
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unsigned long flags;
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int ret, i, j, sg_num;
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dma_params = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
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if (!dma_params) {
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dev_warn(component->dev, "no dma parameters setting\n");
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dma_private->params = NULL;
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return 0;
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}
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if (!dma_private->params) {
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dma_private->params = dma_params;
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ret = sprd_pcm_request_dma_channel(component,
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substream, channels);
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if (ret)
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return ret;
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}
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sg_num = totsize / period;
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dma_private->dma_addr_offset = totsize / channels;
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sg = devm_kcalloc(component->dev, sg_num, sizeof(*sg), GFP_KERNEL);
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if (!sg) {
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ret = -ENOMEM;
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goto sg_err;
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}
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for (i = 0; i < channels; i++) {
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struct sprd_pcm_dma_data *data = &dma_private->data[i];
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struct dma_chan *chan = data->chan;
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struct dma_slave_config config = { };
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struct sprd_dma_linklist link = { };
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enum dma_transfer_direction dir;
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struct scatterlist *sgt = sg;
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config.src_maxburst = dma_params->fragment_len[i];
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config.src_addr_width = dma_params->datawidth[i];
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config.dst_addr_width = dma_params->datawidth[i];
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if (is_playback) {
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config.src_addr = runtime->dma_addr +
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i * dma_private->dma_addr_offset;
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config.dst_addr = dma_params->dev_phys[i];
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dir = DMA_MEM_TO_DEV;
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} else {
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config.src_addr = dma_params->dev_phys[i];
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config.dst_addr = runtime->dma_addr +
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i * dma_private->dma_addr_offset;
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dir = DMA_DEV_TO_MEM;
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}
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sg_init_table(sgt, sg_num);
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for (j = 0; j < sg_num; j++, sgt++) {
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u32 sg_len = period / channels;
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sg_dma_len(sgt) = sg_len;
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sg_dma_address(sgt) = runtime->dma_addr +
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i * dma_private->dma_addr_offset + sg_len * j;
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}
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/*
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* Configure the link-list address for the DMA engine link-list
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* mode.
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*/
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link.virt_addr = (unsigned long)data->virt;
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link.phy_addr = data->phys;
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ret = dmaengine_slave_config(chan, &config);
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if (ret) {
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dev_err(component->dev,
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"failed to set slave configuration: %d\n", ret);
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goto config_err;
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}
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/*
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* We configure the DMA request mode, interrupt mode, channel
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* mode and channel trigger mode by the flags.
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*/
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flags = SPRD_DMA_FLAGS(SPRD_DMA_CHN_MODE_NONE, SPRD_DMA_NO_TRG,
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SPRD_DMA_FRAG_REQ, SPRD_DMA_TRANS_INT);
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data->desc = chan->device->device_prep_slave_sg(chan, sg,
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sg_num, dir,
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flags, &link);
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if (!data->desc) {
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dev_err(component->dev, "failed to prepare slave sg\n");
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ret = -ENOMEM;
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goto config_err;
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}
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if (!runtime->no_period_wakeup) {
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data->desc->callback = sprd_pcm_dma_complete;
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data->desc->callback_param = dma_private;
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}
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}
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devm_kfree(component->dev, sg);
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return 0;
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config_err:
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devm_kfree(component->dev, sg);
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sg_err:
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sprd_pcm_release_dma_channel(substream);
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return ret;
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}
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static int sprd_pcm_hw_free(struct snd_soc_component *component,
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struct snd_pcm_substream *substream)
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{
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sprd_pcm_release_dma_channel(substream);
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return 0;
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}
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static int sprd_pcm_trigger(struct snd_soc_component *component,
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struct snd_pcm_substream *substream, int cmd)
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{
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struct sprd_pcm_dma_private *dma_private =
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substream->runtime->private_data;
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int ret = 0, i;
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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for (i = 0; i < dma_private->hw_chan; i++) {
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struct sprd_pcm_dma_data *data = &dma_private->data[i];
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if (!data->desc)
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continue;
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data->cookie = dmaengine_submit(data->desc);
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ret = dma_submit_error(data->cookie);
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if (ret) {
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dev_err(component->dev,
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"failed to submit dma request: %d\n",
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ret);
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return ret;
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}
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dma_async_issue_pending(data->chan);
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}
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break;
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case SNDRV_PCM_TRIGGER_RESUME:
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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for (i = 0; i < dma_private->hw_chan; i++) {
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struct sprd_pcm_dma_data *data = &dma_private->data[i];
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if (data->chan)
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dmaengine_resume(data->chan);
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}
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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for (i = 0; i < dma_private->hw_chan; i++) {
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struct sprd_pcm_dma_data *data = &dma_private->data[i];
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if (data->chan)
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dmaengine_terminate_async(data->chan);
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}
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break;
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case SNDRV_PCM_TRIGGER_SUSPEND:
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
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for (i = 0; i < dma_private->hw_chan; i++) {
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struct sprd_pcm_dma_data *data = &dma_private->data[i];
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if (data->chan)
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dmaengine_pause(data->chan);
|
||
|
|
}
|
||
|
|
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
ret = -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static snd_pcm_uframes_t sprd_pcm_pointer(struct snd_soc_component *component,
|
||
|
|
struct snd_pcm_substream *substream)
|
||
|
|
{
|
||
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
||
|
|
struct sprd_pcm_dma_private *dma_private = runtime->private_data;
|
||
|
|
int pointer[SPRD_PCM_CHANNEL_MAX];
|
||
|
|
int bytes_of_pointer = 0, sel_max = 0, i;
|
||
|
|
snd_pcm_uframes_t x;
|
||
|
|
struct dma_tx_state state;
|
||
|
|
enum dma_status status;
|
||
|
|
|
||
|
|
for (i = 0; i < dma_private->hw_chan; i++) {
|
||
|
|
struct sprd_pcm_dma_data *data = &dma_private->data[i];
|
||
|
|
|
||
|
|
if (!data->chan)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
status = dmaengine_tx_status(data->chan, data->cookie, &state);
|
||
|
|
if (status == DMA_ERROR) {
|
||
|
|
dev_err(component->dev,
|
||
|
|
"failed to get dma channel %d status\n", i);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* We just get current transfer address from the DMA engine, so
|
||
|
|
* we need convert to current pointer.
|
||
|
|
*/
|
||
|
|
pointer[i] = state.residue - runtime->dma_addr -
|
||
|
|
i * dma_private->dma_addr_offset;
|
||
|
|
|
||
|
|
if (i == 0) {
|
||
|
|
bytes_of_pointer = pointer[i];
|
||
|
|
sel_max = pointer[i] < data->pre_pointer ? 1 : 0;
|
||
|
|
} else {
|
||
|
|
sel_max ^= pointer[i] < data->pre_pointer ? 1 : 0;
|
||
|
|
|
||
|
|
if (sel_max)
|
||
|
|
bytes_of_pointer =
|
||
|
|
max(pointer[i], pointer[i - 1]) << 1;
|
||
|
|
else
|
||
|
|
bytes_of_pointer =
|
||
|
|
min(pointer[i], pointer[i - 1]) << 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
data->pre_pointer = pointer[i];
|
||
|
|
}
|
||
|
|
|
||
|
|
x = bytes_to_frames(runtime, bytes_of_pointer);
|
||
|
|
if (x == runtime->buffer_size)
|
||
|
|
x = 0;
|
||
|
|
|
||
|
|
return x;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sprd_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;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
|
||
|
|
card->dev,
|
||
|
|
sprd_pcm_hardware.buffer_bytes_max);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct snd_soc_component_driver sprd_soc_component = {
|
||
|
|
.name = DRV_NAME,
|
||
|
|
.open = sprd_pcm_open,
|
||
|
|
.close = sprd_pcm_close,
|
||
|
|
.hw_params = sprd_pcm_hw_params,
|
||
|
|
.hw_free = sprd_pcm_hw_free,
|
||
|
|
.trigger = sprd_pcm_trigger,
|
||
|
|
.pointer = sprd_pcm_pointer,
|
||
|
|
.pcm_construct = sprd_pcm_new,
|
||
|
|
.compress_ops = &sprd_platform_compress_ops,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int sprd_soc_platform_probe(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct device_node *np = pdev->dev.of_node;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = of_reserved_mem_device_init_by_idx(&pdev->dev, np, 0);
|
||
|
|
if (ret)
|
||
|
|
dev_warn(&pdev->dev,
|
||
|
|
"no reserved DMA memory for audio platform device\n");
|
||
|
|
|
||
|
|
ret = devm_snd_soc_register_component(&pdev->dev, &sprd_soc_component,
|
||
|
|
NULL, 0);
|
||
|
|
if (ret)
|
||
|
|
dev_err(&pdev->dev, "could not register platform:%d\n", ret);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct of_device_id sprd_pcm_of_match[] = {
|
||
|
|
{ .compatible = "sprd,pcm-platform", },
|
||
|
|
{ },
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(of, sprd_pcm_of_match);
|
||
|
|
|
||
|
|
static struct platform_driver sprd_pcm_driver = {
|
||
|
|
.driver = {
|
||
|
|
.name = "sprd-pcm-audio",
|
||
|
|
.of_match_table = sprd_pcm_of_match,
|
||
|
|
},
|
||
|
|
|
||
|
|
.probe = sprd_soc_platform_probe,
|
||
|
|
};
|
||
|
|
|
||
|
|
module_platform_driver(sprd_pcm_driver);
|
||
|
|
|
||
|
|
MODULE_DESCRIPTION("Spreadtrum ASoC PCM DMA");
|
||
|
|
MODULE_LICENSE("GPL v2");
|
||
|
|
MODULE_ALIAS("platform:sprd-audio");
|