Unverified Commit dde637f2 authored by Peter Ujfalusi's avatar Peter Ujfalusi Committed by Mark Brown
Browse files

ASoC: omap: Introduce the generic_dmaengine_pcm based sdma-pcm 



With the generic dmaengine_pcm support the omap-cpm can be replaced with a
much smaller wrapper.

CPU DAI drivers can use the:
int sdma_pcm_platform_register(struct device *dev,
			       char *txdmachan, char *rxdmachan);

To register the platform driver, txdmachan/rxdmachan is only needed to be
provided if the DMA channel names are not standard tx/rx, like in case of
McPDM, or the DAI is only capable of one audio direction (DMIC, HDMI).

This patch only introduces the source file and changes to the
Kconfig/Makefile, but does not change any of the DAI drivers to use it.

Signed-off-by: default avatarPeter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: default avatarJarkko Nikula <jarkko.nikula@bitmer.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent e5ba3198

sound/soc/omap/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -2,6 +2,12 @@ config SND_OMAP_SOC 
	tristate "SoC Audio for the Texas Instruments OMAP chips"

	depends on (ARCH_OMAP && DMA_OMAP) || (ARM && COMPILE_TEST)

	select SND_DMAENGINE_PCM

	select SND_SDMA_SOC



config SND_SDMA_SOC

	tristate "SoC Audio for Texas Instruments chips using sDMA"

	depends on DMA_OMAP

	select SND_SOC_GENERIC_DMAENGINE_PCM



config SND_OMAP_SOC_DMIC

	tristate

sound/soc/omap/Makefile

+2 −0
Original line number Diff line number Diff line 
# SPDX-License-Identifier: GPL-2.0

# OMAP Platform Support

snd-soc-omap-objs := omap-pcm.o

snd-soc-sdma-objs := sdma-pcm.o

snd-soc-omap-dmic-objs := omap-dmic.o

snd-soc-omap-mcbsp-objs := omap-mcbsp.o mcbsp.o

snd-soc-omap-mcpdm-objs := omap-mcpdm.o

snd-soc-omap-hdmi-audio-objs := omap-hdmi-audio.o



obj-$(CONFIG_SND_OMAP_SOC) += snd-soc-omap.o

obj-$(CONFIG_SND_SDMA_SOC) += snd-soc-sdma.o

obj-$(CONFIG_SND_OMAP_SOC_DMIC) += snd-soc-omap-dmic.o

obj-$(CONFIG_SND_OMAP_SOC_MCBSP) += snd-soc-omap-mcbsp.o

obj-$(CONFIG_SND_OMAP_SOC_MCPDM) += snd-soc-omap-mcpdm.o

sound/soc/omap/sdma-pcm.c

0 → 100644
+68 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 *  Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com

 *  Author: Peter Ujfalusi <peter.ujfalusi@ti.com>

 */



#include <sound/core.h>

#include <sound/pcm.h>

#include <sound/pcm_params.h>

#include <sound/soc.h>

#include <sound/dmaengine_pcm.h>

#include <linux/omap-dma.h>



#include "sdma-pcm.h"



static const struct snd_pcm_hardware sdma_pcm_hardware = {

	.info			= SNDRV_PCM_INFO_MMAP |

				  SNDRV_PCM_INFO_MMAP_VALID |

				  SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |

				  SNDRV_PCM_INFO_NO_PERIOD_WAKEUP |

				  SNDRV_PCM_INFO_INTERLEAVED,

	.period_bytes_min	= 32,

	.period_bytes_max	= 64 * 1024,

	.buffer_bytes_max	= 128 * 1024,

	.periods_min		= 2,

	.periods_max		= 255,

};



static const struct snd_dmaengine_pcm_config sdma_dmaengine_pcm_config = {

	.pcm_hardware = &sdma_pcm_hardware,

	.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,

	.compat_filter_fn = omap_dma_filter_fn,

	.prealloc_buffer_size = 128 * 1024,

};



int sdma_pcm_platform_register(struct device *dev,

			       char *txdmachan, char *rxdmachan)

{

	struct snd_dmaengine_pcm_config *config;

	unsigned int flags = SND_DMAENGINE_PCM_FLAG_COMPAT;



	/* Standard names for the directions: 'tx' and 'rx' */

	if (!txdmachan && !rxdmachan)

		return devm_snd_dmaengine_pcm_register(dev,

						&sdma_dmaengine_pcm_config,

						flags);



	config = devm_kzalloc(dev, sizeof(*config), GFP_KERNEL);

	if (!config)

		return -ENOMEM;



	*config = sdma_dmaengine_pcm_config;



	if (!txdmachan || !rxdmachan) {

		/* One direction only PCM */

		flags |= SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX;

		if (!txdmachan) {

			txdmachan = rxdmachan;

			rxdmachan = NULL;

		}

	}



	config->chan_names[0] = txdmachan;

	config->chan_names[1] = rxdmachan;



	return devm_snd_dmaengine_pcm_register(dev, config, flags);

}

EXPORT_SYMBOL_GPL(sdma_pcm_platform_register);

sound/soc/omap/sdma-pcm.h

0 → 100644
+21 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

/*

 *  Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com

 *  Author: Peter Ujfalusi <peter.ujfalusi@ti.com>

 */



#ifndef __SDMA_PCM_H__

#define __SDMA_PCM_H__



#if IS_ENABLED(CONFIG_SND_SDMA_SOC)

int sdma_pcm_platform_register(struct device *dev,

			       char *txdmachan, char *rxdmachan);

#else

static inline int sdma_pcm_platform_register(struct device *dev,

					     char *txdmachan, char *rxdmachan)

{

	return -ENODEV;

}

#endif /* CONFIG_SND_SDMA_SOC */



#endif /* __SDMA_PCM_H__ */

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