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Release 4.8 sound/arm/pxa2xx-pcm-lib.c

Directory: sound/arm
/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/slab.h>
#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/dma/pxa-dma.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/pxa2xx-lib.h>
#include <sound/dmaengine_pcm.h>

#include "pxa2xx-pcm.h"


static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
	.info			= SNDRV_PCM_INFO_MMAP |
				  SNDRV_PCM_INFO_MMAP_VALID |
				  SNDRV_PCM_INFO_INTERLEAVED |
				  SNDRV_PCM_INFO_PAUSE |
				  SNDRV_PCM_INFO_RESUME,
	.formats		= SNDRV_PCM_FMTBIT_S16_LE |
					SNDRV_PCM_FMTBIT_S24_LE |
					SNDRV_PCM_FMTBIT_S32_LE,
	.period_bytes_min	= 32,
	.period_bytes_max	= 8192 - 32,
	.periods_min		= 1,
	.periods_max		= 256,
	.buffer_bytes_max	= 128 * 1024,
	.fifo_size		= 32,
};


int __pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream); struct snd_soc_pcm_runtime *rtd = substream->private_data; struct snd_dmaengine_dai_dma_data *dma_params; struct dma_slave_config config; int ret; dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); if (!dma_params) return 0; ret = snd_hwparams_to_dma_slave_config(substream, params, &config); if (ret) return ret; snd_dmaengine_pcm_set_config_from_dai_data(substream, snd_soc_dai_get_dma_data(rtd->cpu_dai, substream), &config); ret = dmaengine_slave_config(chan, &config); if (ret) return ret; snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); return 0; }

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EXPORT_SYMBOL(__pxa2xx_pcm_hw_params);
int __pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream) { snd_pcm_set_runtime_buffer(substream, NULL); return 0; }

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EXPORT_SYMBOL(__pxa2xx_pcm_hw_free);
int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) { return snd_dmaengine_pcm_trigger(substream, cmd); }

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EXPORT_SYMBOL(pxa2xx_pcm_trigger);
snd_pcm_uframes_t pxa2xx_pcm_pointer(struct snd_pcm_substream *substream) { return snd_dmaengine_pcm_pointer(substream); }

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EXPORT_SYMBOL(pxa2xx_pcm_pointer);
int __pxa2xx_pcm_prepare(struct snd_pcm_substream *substream) { return 0; }

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EXPORT_SYMBOL(__pxa2xx_pcm_prepare);
int __pxa2xx_pcm_open(struct snd_pcm_substream *substream) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct snd_pcm_runtime *runtime = substream->runtime; struct snd_dmaengine_dai_dma_data *dma_params; int ret; runtime->hw = pxa2xx_pcm_hardware; dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); if (!dma_params) return 0; /* * For mysterious reasons (and despite what the manual says) * playback samples are lost if the DMA count is not a multiple * of the DMA burst size. Let's add a rule to enforce that. */ ret = snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32); if (ret) return ret; ret = snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32); if (ret) return ret; ret = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); if (ret < 0) return ret; return snd_dmaengine_pcm_open_request_chan(substream, pxad_filter_fn, dma_params->filter_data); }

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EXPORT_SYMBOL(__pxa2xx_pcm_open);
int __pxa2xx_pcm_close(struct snd_pcm_substream *substream) { return snd_dmaengine_pcm_close_release_chan(substream); }

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EXPORT_SYMBOL(__pxa2xx_pcm_close);
int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream, struct vm_area_struct *vma) { struct snd_pcm_runtime *runtime = substream->runtime; return dma_mmap_wc(substream->pcm->card->dev, vma, runtime->dma_area, runtime->dma_addr, runtime->dma_bytes); }

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EXPORT_SYMBOL(pxa2xx_pcm_mmap);
int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) { struct snd_pcm_substream *substream = pcm->streams[stream].substream; struct snd_dma_buffer *buf = &substream->dma_buffer; size_t size = pxa2xx_pcm_hardware.buffer_bytes_max; buf->dev.type = SNDRV_DMA_TYPE_DEV; buf->dev.dev = pcm->card->dev; buf->private_data = NULL; buf->area = dma_alloc_wc(pcm->card->dev, size, &buf->addr, GFP_KERNEL); if (!buf->area) return -ENOMEM; buf->bytes = size; return 0; }

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EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm) { struct snd_pcm_substream *substream; struct snd_dma_buffer *buf; int stream; for (stream = 0; stream < 2; stream++) { substream = pcm->streams[stream].substream; if (!substream) continue; buf = &substream->dma_buffer; if (!buf->area) continue; dma_free_wc(pcm->card->dev, buf->bytes, buf->area, buf->addr); buf->area = NULL; } }

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EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers); MODULE_AUTHOR("Nicolas Pitre"); MODULE_DESCRIPTION("Intel PXA2xx sound library"); MODULE_LICENSE("GPL");

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Total771100.00%5100.00%
Directory: sound/arm
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