[alsa-devel] [PATCH v2 1/4] ASoC: davinci: Add edma dmaengine platform driver

[Lars-Peter Clausen]

On 03/14/2014 03:42 PM, Peter Ujfalusi wrote:
> Platform driver glue for SoC using eDMA3 to use dmaengine PCM.
> The maximum number of periods need to be limited to 19 since the
> edma dmaengine driver limits the paRAM slot use for audio at
> in cyclic mode.
>
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi at ti.com>

Looks good.

Reviewed-by: Lars-Peter Clausen <lars at metafoo.de>

> ---
>   sound/soc/davinci/edma-pcm.c | 57 ++++++++++++++++++++++++++++++++++++++++++++
>   sound/soc/davinci/edma-pcm.h | 25 +++++++++++++++++++
>   2 files changed, 82 insertions(+)
>   create mode 100644 sound/soc/davinci/edma-pcm.c
>   create mode 100644 sound/soc/davinci/edma-pcm.h
>
> diff --git a/sound/soc/davinci/edma-pcm.c b/sound/soc/davinci/edma-pcm.c
> new file mode 100644
> index 000000000000..d38afb1c61ae
> --- /dev/null
> +++ b/sound/soc/davinci/edma-pcm.c
> @@ -0,0 +1,57 @@
> +/*
> + * edma-pcm.c - eDMA PCM driver using dmaengine for AM3xxx, AM4xxx
> + *
> + * Copyright (C) 2014 Texas Instruments, Inc.
> + *
> + * Author: Peter Ujfalusi <peter.ujfalusi at ti.com>
> + *
> + * Based on: sound/soc/tegra/tegra_pcm.c
> + *
> + * 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.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + */
> +
> +#include <linux/module.h>
> +#include <sound/core.h>
> +#include <sound/pcm.h>
> +#include <sound/pcm_params.h>
> +#include <sound/soc.h>
> +#include <sound/dmaengine_pcm.h>
> +#include <linux/edma.h>
> +
> +static const struct snd_pcm_hardware edma_pcm_hardware = {
> +	.info			= SNDRV_PCM_INFO_MMAP |
> +				  SNDRV_PCM_INFO_MMAP_VALID |
> +				  SNDRV_PCM_INFO_BATCH |
> +				  SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |
> +				  SNDRV_PCM_INFO_INTERLEAVED,
> +	.buffer_bytes_max	= 128 * 1024,
> +	.period_bytes_min	= 32,
> +	.period_bytes_max	= 64 * 1024,
> +	.periods_min		= 2,
> +	.periods_max		= 19, /* Limit by edma dmaengine driver */
> +};
> +
> +static const struct snd_dmaengine_pcm_config edma_dmaengine_pcm_config = {
> +	.pcm_hardware = &edma_pcm_hardware,
> +	.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
> +	.compat_filter_fn = edma_filter_fn,
> +	.prealloc_buffer_size = 128 * 1024,
> +};
> +
> +int edma_pcm_platform_register(struct device *dev)
> +{
> +	return devm_snd_dmaengine_pcm_register(dev, &edma_dmaengine_pcm_config,
> +					SND_DMAENGINE_PCM_FLAG_COMPAT);
> +}
> +EXPORT_SYMBOL_GPL(edma_pcm_platform_register);
> +
> +MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi at ti.com>");
> +MODULE_DESCRIPTION("eDMA PCM ASoC platform driver");
> +MODULE_LICENSE("GPL");
> diff --git a/sound/soc/davinci/edma-pcm.h b/sound/soc/davinci/edma-pcm.h
> new file mode 100644
> index 000000000000..894c378c0f74
> --- /dev/null
> +++ b/sound/soc/davinci/edma-pcm.h
> @@ -0,0 +1,25 @@
> +/*
> + * edma-pcm.h - eDMA PCM driver using dmaengine for AM3xxx, AM4xxx
> + *
> + * Copyright (C) 2014 Texas Instruments, Inc.
> + *
> + * Author: Peter Ujfalusi <peter.ujfalusi at ti.com>
> + *
> + * Based on: sound/soc/tegra/tegra_pcm.h
> + *
> + * 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.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + */
> +
> +#ifndef __EDMA_PCM_H__
> +#define __EDMA_PCM_H__
> +
> +int edma_pcm_platform_register(struct device *dev);
> +
> +#endif /* __EDMA_PCM_H__ */
>