forked from Minki/linux
58ceb57ec1
This patch removes the old PXA DMA API usage and switches over to generic functions provided by snd-soc-dmaengine-pcm. More cleanups may be done on top of this, and some function stubs can now be removed completetly. However, the intention here was to keep the transition as small as possible. This was tested on the mioa701 pxa27x board. Signed-off-by: Daniel Mack <zonque@gmail.com> [trivial change from mmp-dma to pxa-dma] Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr> Signed-off-by: Mark Brown <broonie@kernel.org>
191 lines
4.9 KiB
C
191 lines
4.9 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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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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#include "pxa2xx-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_request_chan(substream,
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pxad_filter_fn,
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dma_params->filter_data);
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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_writecombine(substream->pcm->card->dev, vma,
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runtime->dma_area,
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runtime->dma_addr,
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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_writecombine(pcm->card->dev, size,
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&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_writecombine(pcm->card->dev, buf->bytes,
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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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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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