sound/soc/omap/omap-pcm.c - linux - Git at Google

 /*
  * omap-pcm.c  --  ALSA PCM interface for the OMAP SoC
  *
  * Copyright (C) 2008 Nokia Corporation
  *
  * Contact: Jarkko Nikula <jarkko.nikula@bitmer.com>
  *          Peter Ujfalusi <peter.ujfalusi@ti.com>
  *
  * 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.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  * 02110-1301 USA
  *
  */

 #include <linux/dma-mapping.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/omap-dma.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/dmaengine_pcm.h>
 #include <sound/soc.h>

 #ifdef CONFIG_ARCH_OMAP1
 #define pcm_omap1510()	cpu_is_omap1510()
 #else
 #define pcm_omap1510()	0
 #endif

 static const struct snd_pcm_hardware omap_pcm_hardware = {
 	.info			= SNDRV_PCM_INFO_MMAP |
 				  SNDRV_PCM_INFO_MMAP_VALID |
 				  SNDRV_PCM_INFO_INTERLEAVED |
 				  SNDRV_PCM_INFO_PAUSE |
 				  SNDRV_PCM_INFO_RESUME |
 				  SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
 	.formats		= SNDRV_PCM_FMTBIT_S16_LE |
 				  SNDRV_PCM_FMTBIT_S32_LE,
 	.period_bytes_min	= 32,
 	.period_bytes_max	= 64 * 1024,
 	.periods_min		= 2,
 	.periods_max		= 255,
 	.buffer_bytes_max	= 128 * 1024,
 };

 /* this may get called several times by oss emulation */
 static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
 			      struct snd_pcm_hw_params *params)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct omap_pcm_dma_data *dma_data;
 	struct dma_slave_config config;
 	struct dma_chan *chan;
 	int err = 0;

 	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

 	/* return if this is a bufferless transfer e.g.
 	 * codec <--> BT codec or GSM modem -- lg FIXME */
 	if (!dma_data)
 		return 0;

 	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 	runtime->dma_bytes = params_buffer_bytes(params);

 	chan = snd_dmaengine_pcm_get_chan(substream);
 	if (!chan)
 		return -EINVAL;

 	/* fills in addr_width and direction */
 	err = snd_hwparams_to_dma_slave_config(substream, params, &config);
 	if (err)
 		return err;

 	snd_dmaengine_pcm_set_config_from_dai_data(substream,
 			snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
 			&config);

 	return dmaengine_slave_config(chan, &config);
 }

 static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
 {
 	snd_pcm_set_runtime_buffer(substream, NULL);
 	return 0;
 }

 static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
 {
 	snd_pcm_uframes_t offset;

 	if (pcm_omap1510())
 		offset = snd_dmaengine_pcm_pointer_no_residue(substream);
 	else
 		offset = snd_dmaengine_pcm_pointer(substream);

 	return offset;
 }

 static int omap_pcm_open(struct snd_pcm_substream *substream)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_dmaengine_dai_dma_data *dma_data;
 	int ret;

 	snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);

 	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

 	/* DT boot: filter_data is the DMA name */
 	if (rtd->cpu_dai->dev->of_node) {
 		struct dma_chan *chan;

 		chan = dma_request_slave_channel(rtd->cpu_dai->dev,
 						 dma_data->filter_data);
 		ret = snd_dmaengine_pcm_open(substream, chan);
 	} else {
 		ret = snd_dmaengine_pcm_open_request_chan(substream,
 							  omap_dma_filter_fn,
 							  dma_data->filter_data);
 	}
 	return ret;
 }

 static int omap_pcm_mmap(struct snd_pcm_substream *substream,
 	struct vm_area_struct *vma)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;

 	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 				     runtime->dma_area,
 				     runtime->dma_addr,
 				     runtime->dma_bytes);
 }

 static struct snd_pcm_ops omap_pcm_ops = {
 	.open		= omap_pcm_open,
 	.close		= snd_dmaengine_pcm_close_release_chan,
 	.ioctl		= snd_pcm_lib_ioctl,
 	.hw_params	= omap_pcm_hw_params,
 	.hw_free	= omap_pcm_hw_free,
 	.trigger	= snd_dmaengine_pcm_trigger,
 	.pointer	= omap_pcm_pointer,
 	.mmap		= omap_pcm_mmap,
 };

 static int omap_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 = omap_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_writecombine(pcm->card->dev, size,
 					   &buf->addr, GFP_KERNEL);
 	if (!buf->area)
 		return -ENOMEM;

 	buf->bytes = size;
 	return 0;
 }

 static void omap_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_writecombine(pcm->card->dev, buf->bytes,
 				      buf->area, buf->addr);
 		buf->area = NULL;
 	}
 }

 static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
 {
 	struct snd_card *card = rtd->card->snd_card;
 	struct snd_pcm *pcm = rtd->pcm;
 	int ret;

 	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(64));
 	if (ret)
 		return ret;

 	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 		ret = omap_pcm_preallocate_dma_buffer(pcm,
 			SNDRV_PCM_STREAM_PLAYBACK);
 		if (ret)
 			goto out;
 	}

 	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 		ret = omap_pcm_preallocate_dma_buffer(pcm,
 			SNDRV_PCM_STREAM_CAPTURE);
 		if (ret)
 			goto out;
 	}

 out:
 	/* free preallocated buffers in case of error */
 	if (ret)
 		omap_pcm_free_dma_buffers(pcm);

 	return ret;
 }

 static struct snd_soc_platform_driver omap_soc_platform = {
 	.ops		= &omap_pcm_ops,
 	.pcm_new	= omap_pcm_new,
 	.pcm_free	= omap_pcm_free_dma_buffers,
 };

 static int omap_pcm_probe(struct platform_device *pdev)
 {
 	return snd_soc_register_platform(&pdev->dev,
 			&omap_soc_platform);
 }

 static int omap_pcm_remove(struct platform_device *pdev)
 {
 	snd_soc_unregister_platform(&pdev->dev);
 	return 0;
 }

 static struct platform_driver omap_pcm_driver = {
 	.driver = {
 			.name = "omap-pcm-audio",
 			.owner = THIS_MODULE,
 	},

 	.probe = omap_pcm_probe,
 	.remove = omap_pcm_remove,
 };

 module_platform_driver(omap_pcm_driver);

 MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
 MODULE_DESCRIPTION("OMAP PCM DMA module");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:omap-pcm-audio");
	/*
	* omap-pcm.c -- ALSA PCM interface for the OMAP SoC
	*
	* Copyright (C) 2008 Nokia Corporation
	*
	* Contact: Jarkko Nikula <jarkko.nikula@bitmer.com>
	* Peter Ujfalusi <peter.ujfalusi@ti.com>
	*
	* 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.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	* 02110-1301 USA
	*
	*/

	#include <linux/dma-mapping.h>
	#include <linux/slab.h>
	#include <linux/module.h>
	#include <linux/omap-dma.h>
	#include <sound/core.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/dmaengine_pcm.h>
	#include <sound/soc.h>

	#ifdef CONFIG_ARCH_OMAP1
	#define pcm_omap1510() cpu_is_omap1510()
	#else
	#define pcm_omap1510() 0
	#endif

	static const struct snd_pcm_hardware omap_pcm_hardware = {
	.info = SNDRV_PCM_INFO_MMAP \|
	SNDRV_PCM_INFO_MMAP_VALID \|
	SNDRV_PCM_INFO_INTERLEAVED \|
	SNDRV_PCM_INFO_PAUSE \|
	SNDRV_PCM_INFO_RESUME \|
	SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
	.formats = SNDRV_PCM_FMTBIT_S16_LE \|
	SNDRV_PCM_FMTBIT_S32_LE,
	.period_bytes_min = 32,
	.period_bytes_max = 64 * 1024,
	.periods_min = 2,
	.periods_max = 255,
	.buffer_bytes_max = 128 * 1024,
	};

	/* this may get called several times by oss emulation */
	static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct omap_pcm_dma_data *dma_data;
	struct dma_slave_config config;
	struct dma_chan *chan;
	int err = 0;

	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

	/* return if this is a bufferless transfer e.g.
	* codec <--> BT codec or GSM modem -- lg FIXME */
	if (!dma_data)
	return 0;

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	runtime->dma_bytes = params_buffer_bytes(params);

	chan = snd_dmaengine_pcm_get_chan(substream);
	if (!chan)
	return -EINVAL;

	/* fills in addr_width and direction */
	err = snd_hwparams_to_dma_slave_config(substream, params, &config);
	if (err)
	return err;

	snd_dmaengine_pcm_set_config_from_dai_data(substream,
	snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
	&config);

	return dmaengine_slave_config(chan, &config);
	}

	static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
	{
	snd_pcm_set_runtime_buffer(substream, NULL);
	return 0;
	}

	static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
	{
	snd_pcm_uframes_t offset;

	if (pcm_omap1510())
	offset = snd_dmaengine_pcm_pointer_no_residue(substream);
	else
	offset = snd_dmaengine_pcm_pointer(substream);

	return offset;
	}

	static int omap_pcm_open(struct snd_pcm_substream *substream)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_dmaengine_dai_dma_data *dma_data;
	int ret;

	snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);

	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

	/* DT boot: filter_data is the DMA name */
	if (rtd->cpu_dai->dev->of_node) {
	struct dma_chan *chan;

	chan = dma_request_slave_channel(rtd->cpu_dai->dev,
	dma_data->filter_data);
	ret = snd_dmaengine_pcm_open(substream, chan);
	} else {
	ret = snd_dmaengine_pcm_open_request_chan(substream,
	omap_dma_filter_fn,
	dma_data->filter_data);
	}
	return ret;
	}

	static int omap_pcm_mmap(struct snd_pcm_substream *substream,
	struct vm_area_struct *vma)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;

	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
	runtime->dma_area,
	runtime->dma_addr,
	runtime->dma_bytes);
	}

	static struct snd_pcm_ops omap_pcm_ops = {
	.open = omap_pcm_open,
	.close = snd_dmaengine_pcm_close_release_chan,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = omap_pcm_hw_params,
	.hw_free = omap_pcm_hw_free,
	.trigger = snd_dmaengine_pcm_trigger,
	.pointer = omap_pcm_pointer,
	.mmap = omap_pcm_mmap,
	};

	static int omap_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 = omap_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_writecombine(pcm->card->dev, size,
	&buf->addr, GFP_KERNEL);
	if (!buf->area)
	return -ENOMEM;

	buf->bytes = size;
	return 0;
	}

	static void omap_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_writecombine(pcm->card->dev, buf->bytes,
	buf->area, buf->addr);
	buf->area = NULL;
	}
	}

	static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
	{
	struct snd_card *card = rtd->card->snd_card;
	struct snd_pcm *pcm = rtd->pcm;
	int ret;

	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(64));
	if (ret)
	return ret;

	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
	ret = omap_pcm_preallocate_dma_buffer(pcm,
	SNDRV_PCM_STREAM_PLAYBACK);
	if (ret)
	goto out;
	}

	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
	ret = omap_pcm_preallocate_dma_buffer(pcm,
	SNDRV_PCM_STREAM_CAPTURE);
	if (ret)
	goto out;
	}

	out:
	/* free preallocated buffers in case of error */
	if (ret)
	omap_pcm_free_dma_buffers(pcm);

	return ret;
	}

	static struct snd_soc_platform_driver omap_soc_platform = {
	.ops = &omap_pcm_ops,
	.pcm_new = omap_pcm_new,
	.pcm_free = omap_pcm_free_dma_buffers,
	};

	static int omap_pcm_probe(struct platform_device *pdev)
	{
	return snd_soc_register_platform(&pdev->dev,
	&omap_soc_platform);
	}

	static int omap_pcm_remove(struct platform_device *pdev)
	{
	snd_soc_unregister_platform(&pdev->dev);
	return 0;
	}

	static struct platform_driver omap_pcm_driver = {
	.driver = {
	.name = "omap-pcm-audio",
	.owner = THIS_MODULE,
	},

	.probe = omap_pcm_probe,
	.remove = omap_pcm_remove,
	};

	module_platform_driver(omap_pcm_driver);

	MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
	MODULE_DESCRIPTION("OMAP PCM DMA module");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:omap-pcm-audio");