276 lines
7.1 KiB
C
276 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/dma-mapping.h>
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#include <linux/dmaengine.h>
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#include <linux/dma/pxa-dma.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/pxa2xx-lib.h>
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#include <sound/dmaengine_pcm.h>
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static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
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.info = SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_PAUSE |
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SNDRV_PCM_INFO_RESUME,
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.formats = SNDRV_PCM_FMTBIT_S16_LE |
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SNDRV_PCM_FMTBIT_S24_LE |
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SNDRV_PCM_FMTBIT_S32_LE,
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.period_bytes_min = 32,
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.period_bytes_max = 8192 - 32,
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.periods_min = 1,
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.periods_max = 256,
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.buffer_bytes_max = 128 * 1024,
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.fifo_size = 32,
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};
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int pxa2xx_pcm_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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struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct snd_dmaengine_dai_dma_data *dma_params;
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struct dma_slave_config config;
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int ret;
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dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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if (!dma_params)
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return 0;
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ret = snd_hwparams_to_dma_slave_config(substream, params, &config);
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if (ret)
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return ret;
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snd_dmaengine_pcm_set_config_from_dai_data(substream,
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snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
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&config);
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ret = dmaengine_slave_config(chan, &config);
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if (ret)
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return ret;
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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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EXPORT_SYMBOL(pxa2xx_pcm_hw_params);
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int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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snd_pcm_set_runtime_buffer(substream, NULL);
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return 0;
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}
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EXPORT_SYMBOL(pxa2xx_pcm_hw_free);
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int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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return snd_dmaengine_pcm_trigger(substream, cmd);
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}
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EXPORT_SYMBOL(pxa2xx_pcm_trigger);
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snd_pcm_uframes_t
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pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
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{
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return snd_dmaengine_pcm_pointer(substream);
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}
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EXPORT_SYMBOL(pxa2xx_pcm_pointer);
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int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
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{
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return 0;
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}
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EXPORT_SYMBOL(pxa2xx_pcm_prepare);
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int pxa2xx_pcm_open(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_dmaengine_dai_dma_data *dma_params;
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int ret;
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runtime->hw = pxa2xx_pcm_hardware;
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dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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if (!dma_params)
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return 0;
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/*
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* For mysterious reasons (and despite what the manual says)
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* playback samples are lost if the DMA count is not a multiple
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* of the DMA burst size. Let's add a rule to enforce that.
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*/
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ret = snd_pcm_hw_constraint_step(runtime, 0,
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SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
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if (ret)
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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, 32);
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if (ret)
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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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return snd_dmaengine_pcm_open(
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substream, dma_request_slave_channel(rtd->cpu_dai->dev,
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dma_params->chan_name));
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}
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EXPORT_SYMBOL(pxa2xx_pcm_open);
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int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
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{
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return snd_dmaengine_pcm_close_release_chan(substream);
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}
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EXPORT_SYMBOL(pxa2xx_pcm_close);
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int pxa2xx_pcm_mmap(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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return dma_mmap_wc(substream->pcm->card->dev, vma, runtime->dma_area,
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runtime->dma_addr, runtime->dma_bytes);
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}
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EXPORT_SYMBOL(pxa2xx_pcm_mmap);
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int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
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{
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struct snd_pcm_substream *substream = pcm->streams[stream].substream;
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struct snd_dma_buffer *buf = &substream->dma_buffer;
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size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
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buf->dev.type = SNDRV_DMA_TYPE_DEV;
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buf->dev.dev = pcm->card->dev;
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buf->private_data = NULL;
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buf->area = dma_alloc_wc(pcm->card->dev, size, &buf->addr, GFP_KERNEL);
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if (!buf->area)
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return -ENOMEM;
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buf->bytes = size;
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return 0;
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}
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EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
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void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
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{
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struct snd_pcm_substream *substream;
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struct snd_dma_buffer *buf;
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int stream;
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for (stream = 0; stream < 2; stream++) {
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substream = pcm->streams[stream].substream;
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if (!substream)
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continue;
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buf = &substream->dma_buffer;
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if (!buf->area)
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continue;
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dma_free_wc(pcm->card->dev, buf->bytes, buf->area, buf->addr);
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buf->area = NULL;
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}
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}
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EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
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void pxa2xx_soc_pcm_free(struct snd_soc_component *component,
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struct snd_pcm *pcm)
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{
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pxa2xx_pcm_free_dma_buffers(pcm);
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}
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EXPORT_SYMBOL(pxa2xx_soc_pcm_free);
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int pxa2xx_soc_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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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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if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
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ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_PLAYBACK);
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if (ret)
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goto out;
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}
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if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
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ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_CAPTURE);
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if (ret)
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goto out;
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}
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out:
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return ret;
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}
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EXPORT_SYMBOL(pxa2xx_soc_pcm_new);
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int pxa2xx_soc_pcm_open(struct snd_soc_component *component,
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struct snd_pcm_substream *substream)
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{
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return pxa2xx_pcm_open(substream);
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}
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EXPORT_SYMBOL(pxa2xx_soc_pcm_open);
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int pxa2xx_soc_pcm_close(struct snd_soc_component *component,
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struct snd_pcm_substream *substream)
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{
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return pxa2xx_pcm_close(substream);
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}
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EXPORT_SYMBOL(pxa2xx_soc_pcm_close);
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int pxa2xx_soc_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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return pxa2xx_pcm_hw_params(substream, params);
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}
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EXPORT_SYMBOL(pxa2xx_soc_pcm_hw_params);
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int pxa2xx_soc_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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return pxa2xx_pcm_hw_free(substream);
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}
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EXPORT_SYMBOL(pxa2xx_soc_pcm_hw_free);
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int pxa2xx_soc_pcm_prepare(struct snd_soc_component *component,
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struct snd_pcm_substream *substream)
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{
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return pxa2xx_pcm_prepare(substream);
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}
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EXPORT_SYMBOL(pxa2xx_soc_pcm_prepare);
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int pxa2xx_soc_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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return pxa2xx_pcm_trigger(substream, cmd);
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}
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EXPORT_SYMBOL(pxa2xx_soc_pcm_trigger);
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snd_pcm_uframes_t
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pxa2xx_soc_pcm_pointer(struct snd_soc_component *component,
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struct snd_pcm_substream *substream)
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{
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return pxa2xx_pcm_pointer(substream);
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}
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EXPORT_SYMBOL(pxa2xx_soc_pcm_pointer);
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int pxa2xx_soc_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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return pxa2xx_pcm_mmap(substream, vma);
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}
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EXPORT_SYMBOL(pxa2xx_soc_pcm_mmap);
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MODULE_AUTHOR("Nicolas Pitre");
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MODULE_DESCRIPTION("Intel PXA2xx sound library");
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MODULE_LICENSE("GPL");
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