sound/soc/pxa/mmp-pcm.c - linux - Git at Google

 /*
  * linux/sound/soc/pxa/mmp-pcm.c
  *
  * Copyright (C) 2011 Marvell International Ltd.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  */
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/dma-mapping.h>
 #include <linux/dmaengine.h>
 #include <linux/platform_data/mmp_audio.h>
 #include <sound/pxa2xx-lib.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <mach/sram.h>
 #include <sound/dmaengine_pcm.h>

 struct mmp_dma_data {
 	int ssp_id;
 	struct resource *dma_res;
 };

 #define MMP_PCM_INFO (SNDRV_PCM_INFO_MMAP |	\
 		SNDRV_PCM_INFO_MMAP_VALID |	\
 		SNDRV_PCM_INFO_INTERLEAVED |	\
 		SNDRV_PCM_INFO_PAUSE |		\
 		SNDRV_PCM_INFO_RESUME)

 #define MMP_PCM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
 			 SNDRV_PCM_FMTBIT_S24_LE | \
 			 SNDRV_PCM_FMTBIT_S32_LE)

 static struct snd_pcm_hardware mmp_pcm_hardware[] = {
 	{
 		.info			= MMP_PCM_INFO,
 		.formats		= MMP_PCM_FORMATS,
 		.period_bytes_min	= 1024,
 		.period_bytes_max	= 2048,
 		.periods_min		= 2,
 		.periods_max		= 32,
 		.buffer_bytes_max	= 4096,
 		.fifo_size		= 32,
 	},
 	{
 		.info			= MMP_PCM_INFO,
 		.formats		= MMP_PCM_FORMATS,
 		.period_bytes_min	= 1024,
 		.period_bytes_max	= 2048,
 		.periods_min		= 2,
 		.periods_max		= 32,
 		.buffer_bytes_max	= 4096,
 		.fifo_size		= 32,
 	},
 };

 static int mmp_pcm_hw_params(struct snd_pcm_substream *substream,
 			      struct snd_pcm_hw_params *params)
 {
 	struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct pxa2xx_pcm_dma_params *dma_params;
 	struct dma_slave_config slave_config;
 	int ret;

 	dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 	if (!dma_params)
 		return 0;

 	ret = snd_hwparams_to_dma_slave_config(substream, params, &slave_config);
 	if (ret)
 		return ret;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		slave_config.dst_addr     = dma_params->dev_addr;
 		slave_config.dst_maxburst = 4;
 	} else {
 		slave_config.src_addr	  = dma_params->dev_addr;
 		slave_config.src_maxburst = 4;
 	}

 	ret = dmaengine_slave_config(chan, &slave_config);
 	if (ret)
 		return ret;

 	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);

 	return 0;
 }

 static bool filter(struct dma_chan *chan, void *param)
 {
 	struct mmp_dma_data *dma_data = param;
 	bool found = false;
 	char *devname;

 	devname = kasprintf(GFP_KERNEL, "%s.%d", dma_data->dma_res->name,
 		dma_data->ssp_id);
 	if ((strcmp(dev_name(chan->device->dev), devname) == 0) &&
 		(chan->chan_id == dma_data->dma_res->start)) {
 		found = true;
 	}

 	kfree(devname);
 	return found;
 }

 static int mmp_pcm_open(struct snd_pcm_substream *substream)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct platform_device *pdev = to_platform_device(rtd->platform->dev);
 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 	struct mmp_dma_data *dma_data;
 	struct resource *r;
 	int ret;

 	r = platform_get_resource(pdev, IORESOURCE_DMA, substream->stream);
 	if (!r)
 		return -EBUSY;

 	snd_soc_set_runtime_hwparams(substream,
 				&mmp_pcm_hardware[substream->stream]);
 	dma_data = devm_kzalloc(&pdev->dev,
 			sizeof(struct mmp_dma_data), GFP_KERNEL);
 	if (dma_data == NULL)
 		return -ENOMEM;

 	dma_data->dma_res = r;
 	dma_data->ssp_id = cpu_dai->id;

 	ret = snd_dmaengine_pcm_open(substream, filter, dma_data);
 	if (ret) {
 		devm_kfree(&pdev->dev, dma_data);
 		return ret;
 	}

 	snd_dmaengine_pcm_set_data(substream, dma_data);
 	return 0;
 }

 static int mmp_pcm_close(struct snd_pcm_substream *substream)
 {
 	struct mmp_dma_data *dma_data = snd_dmaengine_pcm_get_data(substream);
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct platform_device *pdev = to_platform_device(rtd->platform->dev);

 	snd_dmaengine_pcm_close(substream);
 	devm_kfree(&pdev->dev, dma_data);
 	return 0;
 }

 static int mmp_pcm_mmap(struct snd_pcm_substream *substream,
 			 struct vm_area_struct *vma)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	unsigned long off = vma->vm_pgoff;

 	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 	return remap_pfn_range(vma, vma->vm_start,
 		__phys_to_pfn(runtime->dma_addr) + off,
 		vma->vm_end - vma->vm_start, vma->vm_page_prot);
 }

 struct snd_pcm_ops mmp_pcm_ops = {
 	.open		= mmp_pcm_open,
 	.close		= mmp_pcm_close,
 	.ioctl		= snd_pcm_lib_ioctl,
 	.hw_params	= mmp_pcm_hw_params,
 	.trigger	= snd_dmaengine_pcm_trigger,
 	.pointer	= snd_dmaengine_pcm_pointer,
 	.mmap		= mmp_pcm_mmap,
 };

 static void mmp_pcm_free_dma_buffers(struct snd_pcm *pcm)
 {
 	struct snd_pcm_substream *substream;
 	struct snd_dma_buffer *buf;
 	int stream;
 	struct gen_pool *gpool;

 	gpool = sram_get_gpool("asram");
 	if (!gpool)
 		return;

 	for (stream = 0; stream < 2; stream++) {
 		size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;

 		substream = pcm->streams[stream].substream;
 		if (!substream)
 			continue;

 		buf = &substream->dma_buffer;
 		if (!buf->area)
 			continue;
 		gen_pool_free(gpool, (unsigned long)buf->area, size);
 		buf->area = NULL;
 	}

 	return;
 }

 static int mmp_pcm_preallocate_dma_buffer(struct snd_pcm_substream *substream,
 								int stream)
 {
 	struct snd_dma_buffer *buf = &substream->dma_buffer;
 	size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
 	struct gen_pool *gpool;

 	buf->dev.type = SNDRV_DMA_TYPE_DEV;
 	buf->dev.dev = substream->pcm->card->dev;
 	buf->private_data = NULL;

 	gpool = sram_get_gpool("asram");
 	if (!gpool)
 		return -ENOMEM;

 	buf->area = (unsigned char *)gen_pool_alloc(gpool, size);
 	if (!buf->area)
 		return -ENOMEM;
 	buf->addr = gen_pool_virt_to_phys(gpool, (unsigned long)buf->area);
 	buf->bytes = size;
 	return 0;
 }

 int mmp_pcm_new(struct snd_soc_pcm_runtime *rtd)
 {
 	struct snd_pcm_substream *substream;
 	struct snd_pcm *pcm = rtd->pcm;
 	int ret = 0, stream;

 	for (stream = 0; stream < 2; stream++) {
 		substream = pcm->streams[stream].substream;

 		ret = mmp_pcm_preallocate_dma_buffer(substream,	stream);
 		if (ret)
 			goto err;
 	}

 	return 0;

 err:
 	mmp_pcm_free_dma_buffers(pcm);
 	return ret;
 }

 struct snd_soc_platform_driver mmp_soc_platform = {
 	.ops		= &mmp_pcm_ops,
 	.pcm_new	= mmp_pcm_new,
 	.pcm_free	= mmp_pcm_free_dma_buffers,
 };

 static __devinit int mmp_pcm_probe(struct platform_device *pdev)
 {
 	struct mmp_audio_platdata *pdata = pdev->dev.platform_data;

 	if (pdata) {
 		mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].buffer_bytes_max =
 						pdata->buffer_max_playback;
 		mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].period_bytes_max =
 						pdata->period_max_playback;
 		mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].buffer_bytes_max =
 						pdata->buffer_max_capture;
 		mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].period_bytes_max =
 						pdata->period_max_capture;
 	}
 	return snd_soc_register_platform(&pdev->dev, &mmp_soc_platform);
 }

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

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

 	.probe = mmp_pcm_probe,
 	.remove = __devexit_p(mmp_pcm_remove),
 };

 module_platform_driver(mmp_pcm_driver);

 MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
 MODULE_DESCRIPTION("MMP Soc Audio DMA module");
 MODULE_LICENSE("GPL");
	/*
	* linux/sound/soc/pxa/mmp-pcm.c
	*
	* Copyright (C) 2011 Marvell International Ltd.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	*/
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>
	#include <linux/dma-mapping.h>
	#include <linux/dmaengine.h>
	#include <linux/platform_data/mmp_audio.h>
	#include <sound/pxa2xx-lib.h>
	#include <sound/core.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/soc.h>
	#include <mach/sram.h>
	#include <sound/dmaengine_pcm.h>

	struct mmp_dma_data {
	int ssp_id;
	struct resource *dma_res;
	};

	#define MMP_PCM_INFO (SNDRV_PCM_INFO_MMAP \| \
	SNDRV_PCM_INFO_MMAP_VALID \| \
	SNDRV_PCM_INFO_INTERLEAVED \| \
	SNDRV_PCM_INFO_PAUSE \| \
	SNDRV_PCM_INFO_RESUME)

	#define MMP_PCM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE \| \
	SNDRV_PCM_FMTBIT_S24_LE \| \
	SNDRV_PCM_FMTBIT_S32_LE)

	static struct snd_pcm_hardware mmp_pcm_hardware[] = {
	{
	.info = MMP_PCM_INFO,
	.formats = MMP_PCM_FORMATS,
	.period_bytes_min = 1024,
	.period_bytes_max = 2048,
	.periods_min = 2,
	.periods_max = 32,
	.buffer_bytes_max = 4096,
	.fifo_size = 32,
	},
	{
	.info = MMP_PCM_INFO,
	.formats = MMP_PCM_FORMATS,
	.period_bytes_min = 1024,
	.period_bytes_max = 2048,
	.periods_min = 2,
	.periods_max = 32,
	.buffer_bytes_max = 4096,
	.fifo_size = 32,
	},
	};

	static int mmp_pcm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
	{
	struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct pxa2xx_pcm_dma_params *dma_params;
	struct dma_slave_config slave_config;
	int ret;

	dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	if (!dma_params)
	return 0;

	ret = snd_hwparams_to_dma_slave_config(substream, params, &slave_config);
	if (ret)
	return ret;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	slave_config.dst_addr = dma_params->dev_addr;
	slave_config.dst_maxburst = 4;
	} else {
	slave_config.src_addr = dma_params->dev_addr;
	slave_config.src_maxburst = 4;
	}

	ret = dmaengine_slave_config(chan, &slave_config);
	if (ret)
	return ret;

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);

	return 0;
	}

	static bool filter(struct dma_chan chan, void param)
	{
	struct mmp_dma_data *dma_data = param;
	bool found = false;
	char *devname;

	devname = kasprintf(GFP_KERNEL, "%s.%d", dma_data->dma_res->name,
	dma_data->ssp_id);
	if ((strcmp(dev_name(chan->device->dev), devname) == 0) &&
	(chan->chan_id == dma_data->dma_res->start)) {
	found = true;
	}

	kfree(devname);
	return found;
	}

	static int mmp_pcm_open(struct snd_pcm_substream *substream)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct platform_device *pdev = to_platform_device(rtd->platform->dev);
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct mmp_dma_data *dma_data;
	struct resource *r;
	int ret;

	r = platform_get_resource(pdev, IORESOURCE_DMA, substream->stream);
	if (!r)
	return -EBUSY;

	snd_soc_set_runtime_hwparams(substream,
	&mmp_pcm_hardware[substream->stream]);
	dma_data = devm_kzalloc(&pdev->dev,
	sizeof(struct mmp_dma_data), GFP_KERNEL);
	if (dma_data == NULL)
	return -ENOMEM;

	dma_data->dma_res = r;
	dma_data->ssp_id = cpu_dai->id;

	ret = snd_dmaengine_pcm_open(substream, filter, dma_data);
	if (ret) {
	devm_kfree(&pdev->dev, dma_data);
	return ret;
	}

	snd_dmaengine_pcm_set_data(substream, dma_data);
	return 0;
	}

	static int mmp_pcm_close(struct snd_pcm_substream *substream)
	{
	struct mmp_dma_data *dma_data = snd_dmaengine_pcm_get_data(substream);
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct platform_device *pdev = to_platform_device(rtd->platform->dev);

	snd_dmaengine_pcm_close(substream);
	devm_kfree(&pdev->dev, dma_data);
	return 0;
	}

	static int mmp_pcm_mmap(struct snd_pcm_substream *substream,
	struct vm_area_struct *vma)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	unsigned long off = vma->vm_pgoff;

	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
	return remap_pfn_range(vma, vma->vm_start,
	__phys_to_pfn(runtime->dma_addr) + off,
	vma->vm_end - vma->vm_start, vma->vm_page_prot);
	}

	struct snd_pcm_ops mmp_pcm_ops = {
	.open = mmp_pcm_open,
	.close = mmp_pcm_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = mmp_pcm_hw_params,
	.trigger = snd_dmaengine_pcm_trigger,
	.pointer = snd_dmaengine_pcm_pointer,
	.mmap = mmp_pcm_mmap,
	};

	static void mmp_pcm_free_dma_buffers(struct snd_pcm *pcm)
	{
	struct snd_pcm_substream *substream;
	struct snd_dma_buffer *buf;
	int stream;
	struct gen_pool *gpool;

	gpool = sram_get_gpool("asram");
	if (!gpool)
	return;

	for (stream = 0; stream < 2; stream++) {
	size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;

	substream = pcm->streams[stream].substream;
	if (!substream)
	continue;

	buf = &substream->dma_buffer;
	if (!buf->area)
	continue;
	gen_pool_free(gpool, (unsigned long)buf->area, size);
	buf->area = NULL;
	}

	return;
	}

	static int mmp_pcm_preallocate_dma_buffer(struct snd_pcm_substream *substream,
	int stream)
	{
	struct snd_dma_buffer *buf = &substream->dma_buffer;
	size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
	struct gen_pool *gpool;

	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	buf->dev.dev = substream->pcm->card->dev;
	buf->private_data = NULL;

	gpool = sram_get_gpool("asram");
	if (!gpool)
	return -ENOMEM;

	buf->area = (unsigned char *)gen_pool_alloc(gpool, size);
	if (!buf->area)
	return -ENOMEM;
	buf->addr = gen_pool_virt_to_phys(gpool, (unsigned long)buf->area);
	buf->bytes = size;
	return 0;
	}

	int mmp_pcm_new(struct snd_soc_pcm_runtime *rtd)
	{
	struct snd_pcm_substream *substream;
	struct snd_pcm *pcm = rtd->pcm;
	int ret = 0, stream;

	for (stream = 0; stream < 2; stream++) {
	substream = pcm->streams[stream].substream;

	ret = mmp_pcm_preallocate_dma_buffer(substream, stream);
	if (ret)
	goto err;
	}

	return 0;

	err:
	mmp_pcm_free_dma_buffers(pcm);
	return ret;
	}

	struct snd_soc_platform_driver mmp_soc_platform = {
	.ops = &mmp_pcm_ops,
	.pcm_new = mmp_pcm_new,
	.pcm_free = mmp_pcm_free_dma_buffers,
	};

	static __devinit int mmp_pcm_probe(struct platform_device *pdev)
	{
	struct mmp_audio_platdata *pdata = pdev->dev.platform_data;

	if (pdata) {
	mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].buffer_bytes_max =
	pdata->buffer_max_playback;
	mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].period_bytes_max =
	pdata->period_max_playback;
	mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].buffer_bytes_max =
	pdata->buffer_max_capture;
	mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].period_bytes_max =
	pdata->period_max_capture;
	}
	return snd_soc_register_platform(&pdev->dev, &mmp_soc_platform);
	}

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

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

	.probe = mmp_pcm_probe,
	.remove = __devexit_p(mmp_pcm_remove),
	};

	module_platform_driver(mmp_pcm_driver);

	MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
	MODULE_DESCRIPTION("MMP Soc Audio DMA module");
	MODULE_LICENSE("GPL");