sound/soc/mxs/mxs-pcm.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
  *
  * Based on sound/soc/imx/imx-pcm-dma-mx2.c
  *
  * 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.
  *
  * 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */

 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/dma-mapping.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/dmaengine.h>

 #include <sound/core.h>
 #include <sound/initval.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>

 #include <mach/dma.h>
 #include "mxs-pcm.h"

 static struct snd_pcm_hardware snd_mxs_hardware = {
 	.info			= SNDRV_PCM_INFO_MMAP |
 				  SNDRV_PCM_INFO_MMAP_VALID |
 				  SNDRV_PCM_INFO_PAUSE |
 				  SNDRV_PCM_INFO_RESUME |
 				  SNDRV_PCM_INFO_INTERLEAVED,
 	.formats		= SNDRV_PCM_FMTBIT_S16_LE |
 				  SNDRV_PCM_FMTBIT_S20_3LE |
 				  SNDRV_PCM_FMTBIT_S24_LE,
 	.channels_min		= 2,
 	.channels_max		= 2,
 	.period_bytes_min	= 32,
 	.period_bytes_max	= 8192,
 	.periods_min		= 1,
 	.periods_max		= 52,
 	.buffer_bytes_max	= 64 * 1024,
 	.fifo_size		= 32,

 };

 static void audio_dma_irq(void *data)
 {
 	struct snd_pcm_substream *substream = (struct snd_pcm_substream *)data;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct mxs_pcm_runtime_data *iprtd = runtime->private_data;

 	iprtd->offset += iprtd->period_bytes;
 	iprtd->offset %= iprtd->period_bytes * iprtd->periods;
 	snd_pcm_period_elapsed(substream);
 }

 static bool filter(struct dma_chan *chan, void *param)
 {
 	struct mxs_pcm_runtime_data *iprtd = param;
 	struct mxs_pcm_dma_params *dma_params = iprtd->dma_params;

 	if (!mxs_dma_is_apbx(chan))
 		return false;

 	if (chan->chan_id != dma_params->chan_num)
 		return false;

 	chan->private = &iprtd->dma_data;

 	return true;
 }

 static int mxs_dma_alloc(struct snd_pcm_substream *substream,
 				struct snd_pcm_hw_params *params)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
 	dma_cap_mask_t mask;

 	iprtd->dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

 	dma_cap_zero(mask);
 	dma_cap_set(DMA_SLAVE, mask);
 	iprtd->dma_data.chan_irq = iprtd->dma_params->chan_irq;
 	iprtd->dma_chan = dma_request_channel(mask, filter, iprtd);
 	if (!iprtd->dma_chan)
 		return -EINVAL;

 	return 0;
 }

 static int snd_mxs_pcm_hw_params(struct snd_pcm_substream *substream,
 				struct snd_pcm_hw_params *params)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
 	unsigned long dma_addr;
 	struct dma_chan *chan;
 	int ret;

 	ret = mxs_dma_alloc(substream, params);
 	if (ret)
 		return ret;
 	chan = iprtd->dma_chan;

 	iprtd->size = params_buffer_bytes(params);
 	iprtd->periods = params_periods(params);
 	iprtd->period_bytes = params_period_bytes(params);
 	iprtd->offset = 0;
 	iprtd->period_time = HZ / (params_rate(params) /
 			params_period_size(params));

 	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);

 	dma_addr = runtime->dma_addr;

 	iprtd->buf = substream->dma_buffer.area;

 	iprtd->desc = dmaengine_prep_dma_cyclic(chan, dma_addr,
 			iprtd->period_bytes * iprtd->periods,
 			iprtd->period_bytes,
 			substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 			DMA_MEM_TO_DEV : DMA_DEV_TO_MEM);
 	if (!iprtd->desc) {
 		dev_err(&chan->dev->device, "cannot prepare slave dma\n");
 		return -EINVAL;
 	}

 	iprtd->desc->callback = audio_dma_irq;
 	iprtd->desc->callback_param = substream;

 	return 0;
 }

 static int snd_mxs_pcm_hw_free(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct mxs_pcm_runtime_data *iprtd = runtime->private_data;

 	if (iprtd->dma_chan) {
 		dma_release_channel(iprtd->dma_chan);
 		iprtd->dma_chan = NULL;
 	}

 	return 0;
 }

 static int snd_mxs_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct mxs_pcm_runtime_data *iprtd = runtime->private_data;

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		dmaengine_submit(iprtd->desc);

 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		dmaengine_terminate_all(iprtd->dma_chan);

 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static snd_pcm_uframes_t snd_mxs_pcm_pointer(
 		struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct mxs_pcm_runtime_data *iprtd = runtime->private_data;

 	return bytes_to_frames(substream->runtime, iprtd->offset);
 }

 static int snd_mxs_open(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct mxs_pcm_runtime_data *iprtd;
 	int ret;

 	iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
 	if (iprtd == NULL)
 		return -ENOMEM;
 	runtime->private_data = iprtd;

 	ret = snd_pcm_hw_constraint_integer(substream->runtime,
 			SNDRV_PCM_HW_PARAM_PERIODS);
 	if (ret < 0) {
 		kfree(iprtd);
 		return ret;
 	}

 	snd_soc_set_runtime_hwparams(substream, &snd_mxs_hardware);

 	return 0;
 }

 static int snd_mxs_close(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct mxs_pcm_runtime_data *iprtd = runtime->private_data;

 	kfree(iprtd);

 	return 0;
 }

 static int snd_mxs_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 mxs_pcm_ops = {
 	.open		= snd_mxs_open,
 	.close		= snd_mxs_close,
 	.ioctl		= snd_pcm_lib_ioctl,
 	.hw_params	= snd_mxs_pcm_hw_params,
 	.hw_free	= snd_mxs_pcm_hw_free,
 	.trigger	= snd_mxs_pcm_trigger,
 	.pointer	= snd_mxs_pcm_pointer,
 	.mmap		= snd_mxs_pcm_mmap,
 };

 static int mxs_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 = snd_mxs_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 u64 mxs_pcm_dmamask = DMA_BIT_MASK(32);
 static int mxs_pcm_new(struct snd_soc_pcm_runtime *rtd)
 {
 	struct snd_card *card = rtd->card->snd_card;
 	struct snd_pcm *pcm = rtd->pcm;
 	int ret = 0;

 	if (!card->dev->dma_mask)
 		card->dev->dma_mask = &mxs_pcm_dmamask;
 	if (!card->dev->coherent_dma_mask)
 		card->dev->coherent_dma_mask = DMA_BIT_MASK(32);

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

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

 out:
 	return ret;
 }

 static void mxs_pcm_free(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 struct snd_soc_platform_driver mxs_soc_platform = {
 	.ops		= &mxs_pcm_ops,
 	.pcm_new	= mxs_pcm_new,
 	.pcm_free	= mxs_pcm_free,
 };

 static int __devinit mxs_soc_platform_probe(struct platform_device *pdev)
 {
 	return snd_soc_register_platform(&pdev->dev, &mxs_soc_platform);
 }

 static int __devexit mxs_soc_platform_remove(struct platform_device *pdev)
 {
 	snd_soc_unregister_platform(&pdev->dev);

 	return 0;
 }

 static struct platform_driver mxs_pcm_driver = {
 	.driver = {
 		.name = "mxs-pcm-audio",
 		.owner = THIS_MODULE,
 	},
 	.probe = mxs_soc_platform_probe,
 	.remove = __devexit_p(mxs_soc_platform_remove),
 };

 module_platform_driver(mxs_pcm_driver);

 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:mxs-pcm-audio");
	/*
	* Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
	*
	* Based on sound/soc/imx/imx-pcm-dma-mx2.c
	*
	* 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.
	*
	* 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
	*/

	#include <linux/clk.h>
	#include <linux/delay.h>
	#include <linux/device.h>
	#include <linux/dma-mapping.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>
	#include <linux/dmaengine.h>

	#include <sound/core.h>
	#include <sound/initval.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/soc.h>

	#include <mach/dma.h>
	#include "mxs-pcm.h"

	static struct snd_pcm_hardware snd_mxs_hardware = {
	.info = SNDRV_PCM_INFO_MMAP \|
	SNDRV_PCM_INFO_MMAP_VALID \|
	SNDRV_PCM_INFO_PAUSE \|
	SNDRV_PCM_INFO_RESUME \|
	SNDRV_PCM_INFO_INTERLEAVED,
	.formats = SNDRV_PCM_FMTBIT_S16_LE \|
	SNDRV_PCM_FMTBIT_S20_3LE \|
	SNDRV_PCM_FMTBIT_S24_LE,
	.channels_min = 2,
	.channels_max = 2,
	.period_bytes_min = 32,
	.period_bytes_max = 8192,
	.periods_min = 1,
	.periods_max = 52,
	.buffer_bytes_max = 64 * 1024,
	.fifo_size = 32,

	};

	static void audio_dma_irq(void *data)
	{
	struct snd_pcm_substream substream = (struct snd_pcm_substream )data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct mxs_pcm_runtime_data *iprtd = runtime->private_data;

	iprtd->offset += iprtd->period_bytes;
	iprtd->offset %= iprtd->period_bytes * iprtd->periods;
	snd_pcm_period_elapsed(substream);
	}

	static bool filter(struct dma_chan chan, void param)
	{
	struct mxs_pcm_runtime_data *iprtd = param;
	struct mxs_pcm_dma_params *dma_params = iprtd->dma_params;

	if (!mxs_dma_is_apbx(chan))
	return false;

	if (chan->chan_id != dma_params->chan_num)
	return false;

	chan->private = &iprtd->dma_data;

	return true;
	}

	static int mxs_dma_alloc(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
	dma_cap_mask_t mask;

	iprtd->dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

	dma_cap_zero(mask);
	dma_cap_set(DMA_SLAVE, mask);
	iprtd->dma_data.chan_irq = iprtd->dma_params->chan_irq;
	iprtd->dma_chan = dma_request_channel(mask, filter, iprtd);
	if (!iprtd->dma_chan)
	return -EINVAL;

	return 0;
	}

	static int snd_mxs_pcm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
	unsigned long dma_addr;
	struct dma_chan *chan;
	int ret;

	ret = mxs_dma_alloc(substream, params);
	if (ret)
	return ret;
	chan = iprtd->dma_chan;

	iprtd->size = params_buffer_bytes(params);
	iprtd->periods = params_periods(params);
	iprtd->period_bytes = params_period_bytes(params);
	iprtd->offset = 0;
	iprtd->period_time = HZ / (params_rate(params) /
	params_period_size(params));

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);

	dma_addr = runtime->dma_addr;

	iprtd->buf = substream->dma_buffer.area;

	iprtd->desc = dmaengine_prep_dma_cyclic(chan, dma_addr,
	iprtd->period_bytes * iprtd->periods,
	iprtd->period_bytes,
	substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
	DMA_MEM_TO_DEV : DMA_DEV_TO_MEM);
	if (!iprtd->desc) {
	dev_err(&chan->dev->device, "cannot prepare slave dma\n");
	return -EINVAL;
	}

	iprtd->desc->callback = audio_dma_irq;
	iprtd->desc->callback_param = substream;

	return 0;
	}

	static int snd_mxs_pcm_hw_free(struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct mxs_pcm_runtime_data *iprtd = runtime->private_data;

	if (iprtd->dma_chan) {
	dma_release_channel(iprtd->dma_chan);
	iprtd->dma_chan = NULL;
	}

	return 0;
	}

	static int snd_mxs_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct mxs_pcm_runtime_data *iprtd = runtime->private_data;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	dmaengine_submit(iprtd->desc);

	break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	dmaengine_terminate_all(iprtd->dma_chan);

	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	static snd_pcm_uframes_t snd_mxs_pcm_pointer(
	struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct mxs_pcm_runtime_data *iprtd = runtime->private_data;

	return bytes_to_frames(substream->runtime, iprtd->offset);
	}

	static int snd_mxs_open(struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct mxs_pcm_runtime_data *iprtd;
	int ret;

	iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
	if (iprtd == NULL)
	return -ENOMEM;
	runtime->private_data = iprtd;

	ret = snd_pcm_hw_constraint_integer(substream->runtime,
	SNDRV_PCM_HW_PARAM_PERIODS);
	if (ret < 0) {
	kfree(iprtd);
	return ret;
	}

	snd_soc_set_runtime_hwparams(substream, &snd_mxs_hardware);

	return 0;
	}

	static int snd_mxs_close(struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct mxs_pcm_runtime_data *iprtd = runtime->private_data;

	kfree(iprtd);

	return 0;
	}

	static int snd_mxs_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 mxs_pcm_ops = {
	.open = snd_mxs_open,
	.close = snd_mxs_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = snd_mxs_pcm_hw_params,
	.hw_free = snd_mxs_pcm_hw_free,
	.trigger = snd_mxs_pcm_trigger,
	.pointer = snd_mxs_pcm_pointer,
	.mmap = snd_mxs_pcm_mmap,
	};

	static int mxs_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 = snd_mxs_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 u64 mxs_pcm_dmamask = DMA_BIT_MASK(32);
	static int mxs_pcm_new(struct snd_soc_pcm_runtime *rtd)
	{
	struct snd_card *card = rtd->card->snd_card;
	struct snd_pcm *pcm = rtd->pcm;
	int ret = 0;

	if (!card->dev->dma_mask)
	card->dev->dma_mask = &mxs_pcm_dmamask;
	if (!card->dev->coherent_dma_mask)
	card->dev->coherent_dma_mask = DMA_BIT_MASK(32);

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

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

	out:
	return ret;
	}

	static void mxs_pcm_free(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 struct snd_soc_platform_driver mxs_soc_platform = {
	.ops = &mxs_pcm_ops,
	.pcm_new = mxs_pcm_new,
	.pcm_free = mxs_pcm_free,
	};

	static int __devinit mxs_soc_platform_probe(struct platform_device *pdev)
	{
	return snd_soc_register_platform(&pdev->dev, &mxs_soc_platform);
	}

	static int __devexit mxs_soc_platform_remove(struct platform_device *pdev)
	{
	snd_soc_unregister_platform(&pdev->dev);

	return 0;
	}

	static struct platform_driver mxs_pcm_driver = {
	.driver = {
	.name = "mxs-pcm-audio",
	.owner = THIS_MODULE,
	},
	.probe = mxs_soc_platform_probe,
	.remove = __devexit_p(mxs_soc_platform_remove),
	};

	module_platform_driver(mxs_pcm_driver);

	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:mxs-pcm-audio");