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558 lines
14 KiB
558 lines
14 KiB
// 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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snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); |
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runtime->dma_bytes = totsize; |
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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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snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); |
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runtime->dma_bytes = totsize; |
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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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snd_pcm_set_runtime_buffer(substream, NULL); |
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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); |
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} |
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break; |
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default: |
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ret = -EINVAL; |
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} |
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return ret; |
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} |
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static snd_pcm_uframes_t sprd_pcm_pointer(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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int pointer[SPRD_PCM_CHANNEL_MAX]; |
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int bytes_of_pointer = 0, sel_max = 0, i; |
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snd_pcm_uframes_t x; |
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struct dma_tx_state state; |
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enum dma_status status; |
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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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continue; |
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status = dmaengine_tx_status(data->chan, data->cookie, &state); |
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if (status == DMA_ERROR) { |
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dev_err(component->dev, |
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"failed to get dma channel %d status\n", i); |
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return 0; |
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} |
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/* |
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* We just get current transfer address from the DMA engine, so |
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* we need convert to current pointer. |
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*/ |
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pointer[i] = state.residue - runtime->dma_addr - |
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i * dma_private->dma_addr_offset; |
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if (i == 0) { |
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bytes_of_pointer = pointer[i]; |
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sel_max = pointer[i] < data->pre_pointer ? 1 : 0; |
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} else { |
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sel_max ^= pointer[i] < data->pre_pointer ? 1 : 0; |
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if (sel_max) |
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bytes_of_pointer = |
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max(pointer[i], pointer[i - 1]) << 1; |
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else |
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bytes_of_pointer = |
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min(pointer[i], pointer[i - 1]) << 1; |
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} |
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data->pre_pointer = pointer[i]; |
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} |
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x = bytes_to_frames(runtime, bytes_of_pointer); |
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if (x == runtime->buffer_size) |
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x = 0; |
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return x; |
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} |
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static int sprd_pcm_mmap(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream, |
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struct vm_area_struct *vma) |
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{ |
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struct snd_pcm_runtime *runtime = substream->runtime; |
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vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); |
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return remap_pfn_range(vma, vma->vm_start, |
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runtime->dma_addr >> PAGE_SHIFT, |
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vma->vm_end - vma->vm_start, |
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vma->vm_page_prot); |
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} |
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static int sprd_pcm_new(struct snd_soc_component *component, |
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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 *pcm = rtd->pcm; |
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struct snd_pcm_substream *substream; |
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int ret; |
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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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return ret; |
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substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; |
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if (substream) { |
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ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, card->dev, |
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sprd_pcm_hardware.buffer_bytes_max, |
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&substream->dma_buffer); |
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if (ret) { |
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dev_err(card->dev, |
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"can't alloc playback dma buffer: %d\n", ret); |
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return ret; |
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} |
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} |
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substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; |
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if (substream) { |
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ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, card->dev, |
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sprd_pcm_hardware.buffer_bytes_max, |
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&substream->dma_buffer); |
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if (ret) { |
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dev_err(card->dev, |
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"can't alloc capture dma buffer: %d\n", ret); |
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snd_dma_free_pages(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->dma_buffer); |
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return ret; |
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} |
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} |
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return 0; |
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} |
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static void sprd_pcm_free(struct snd_soc_component *component, |
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struct snd_pcm *pcm) |
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{ |
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struct snd_pcm_substream *substream; |
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int i; |
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for (i = 0; i < ARRAY_SIZE(pcm->streams); i++) { |
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substream = pcm->streams[i].substream; |
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if (substream) { |
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snd_dma_free_pages(&substream->dma_buffer); |
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substream->dma_buffer.area = NULL; |
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substream->dma_buffer.addr = 0; |
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} |
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} |
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} |
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static const struct snd_soc_component_driver sprd_soc_component = { |
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.name = DRV_NAME, |
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.open = sprd_pcm_open, |
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.close = sprd_pcm_close, |
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.hw_params = sprd_pcm_hw_params, |
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.hw_free = sprd_pcm_hw_free, |
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.trigger = sprd_pcm_trigger, |
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.pointer = sprd_pcm_pointer, |
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.mmap = sprd_pcm_mmap, |
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.pcm_construct = sprd_pcm_new, |
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.pcm_destruct = sprd_pcm_free, |
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.compress_ops = &sprd_platform_compress_ops, |
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}; |
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static int sprd_soc_platform_probe(struct platform_device *pdev) |
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{ |
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struct device_node *np = pdev->dev.of_node; |
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int ret; |
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ret = of_reserved_mem_device_init_by_idx(&pdev->dev, np, 0); |
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if (ret) |
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dev_warn(&pdev->dev, |
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"no reserved DMA memory for audio platform device\n"); |
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ret = devm_snd_soc_register_component(&pdev->dev, &sprd_soc_component, |
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NULL, 0); |
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if (ret) |
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dev_err(&pdev->dev, "could not register platform:%d\n", ret); |
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return ret; |
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} |
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static const struct of_device_id sprd_pcm_of_match[] = { |
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{ .compatible = "sprd,pcm-platform", }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, sprd_pcm_of_match); |
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static struct platform_driver sprd_pcm_driver = { |
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.driver = { |
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.name = "sprd-pcm-audio", |
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.of_match_table = sprd_pcm_of_match, |
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}, |
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.probe = sprd_soc_platform_probe, |
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}; |
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module_platform_driver(sprd_pcm_driver); |
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|
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MODULE_DESCRIPTION("Spreadtrum ASoC PCM DMA"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_ALIAS("platform:sprd-audio");
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