forked from Minki/linux
24600b5472
The SNDRV_PCM_INFO_BATCH will be added back based on the dmaengine driver's capabilities. Patches for edma dmaengine driver has been prepared to suppress the interrupts. We can add this flag right away and have the benefit of not having interrupts during audio activity when the edma and ASoC patches are in the same tree. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Tested-by: Daniel Mack <daniel@zonque.org> Signed-off-by: Mark Brown <broonie@linaro.org>
58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
/*
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* edma-pcm.c - eDMA PCM driver using dmaengine for AM3xxx, AM4xxx
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*
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* Copyright (C) 2014 Texas Instruments, Inc.
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*
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* Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
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*
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* Based on: sound/soc/tegra/tegra_pcm.c
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/module.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/soc.h>
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#include <sound/dmaengine_pcm.h>
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#include <linux/edma.h>
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static const struct snd_pcm_hardware edma_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_PAUSE | SNDRV_PCM_INFO_RESUME |
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SNDRV_PCM_INFO_NO_PERIOD_WAKEUP |
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SNDRV_PCM_INFO_INTERLEAVED,
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.buffer_bytes_max = 128 * 1024,
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.period_bytes_min = 32,
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.period_bytes_max = 64 * 1024,
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.periods_min = 2,
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.periods_max = 19, /* Limit by edma dmaengine driver */
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};
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static const struct snd_dmaengine_pcm_config edma_dmaengine_pcm_config = {
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.pcm_hardware = &edma_pcm_hardware,
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.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
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.compat_filter_fn = edma_filter_fn,
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.prealloc_buffer_size = 128 * 1024,
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};
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int edma_pcm_platform_register(struct device *dev)
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{
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return devm_snd_dmaengine_pcm_register(dev, &edma_dmaengine_pcm_config,
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SND_DMAENGINE_PCM_FLAG_COMPAT);
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}
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EXPORT_SYMBOL_GPL(edma_pcm_platform_register);
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MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
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MODULE_DESCRIPTION("eDMA PCM ASoC platform driver");
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MODULE_LICENSE("GPL");
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