[linux-2.6-block.git] / sound / soc / imx / imx-pcm-dma-mx2.c

/*
 * imx-pcm-dma-mx2.c  --  ALSA Soc Audio Layer
 *
 * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
 *
 * This code is based on code copyrighted by Freescale,
 * Liam Girdwood, Javier Martin and probably others.
 *
 *  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/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 <linux/types.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 "imx-ssi.h"

struct imx_pcm_runtime_data {
	int period_bytes;
	int periods;
	int dma;
	unsigned long offset;
	unsigned long size;
	void *buf;
	int period_time;
	struct dma_async_tx_descriptor *desc;
	struct dma_chan *dma_chan;
	struct imx_dma_data dma_data;
};

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 imx_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 imx_pcm_runtime_data *iprtd = param;

	if (!imx_dma_is_general_purpose(chan))
		return false;

        chan->private = &iprtd->dma_data;

        return true;
}

static int imx_ssi_dma_alloc(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct imx_pcm_dma_params *dma_params;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	struct dma_slave_config slave_config;
	dma_cap_mask_t mask;
	enum dma_slave_buswidth buswidth;
	int ret;

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

	iprtd->dma_data.peripheral_type = IMX_DMATYPE_SSI;
	iprtd->dma_data.priority = DMA_PRIO_HIGH;
	iprtd->dma_data.dma_request = dma_params->dma;

	/* Try to grab a DMA channel */
	if (!iprtd->dma_chan) {
		dma_cap_zero(mask);
		dma_cap_set(DMA_SLAVE, mask);
		iprtd->dma_chan = dma_request_channel(mask, filter, iprtd);
		if (!iprtd->dma_chan)
			return -EINVAL;
	}

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
		break;
	case SNDRV_PCM_FORMAT_S20_3LE:
	case SNDRV_PCM_FORMAT_S24_LE:
		buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
		break;
	default:
		return 0;
	}

	slave_config.device_fc = false;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		slave_config.direction = DMA_MEM_TO_DEV;
		slave_config.dst_addr = dma_params->dma_addr;
		slave_config.dst_addr_width = buswidth;
		slave_config.dst_maxburst = dma_params->burstsize;
	} else {
		slave_config.direction = DMA_DEV_TO_MEM;
		slave_config.src_addr = dma_params->dma_addr;
		slave_config.src_addr_width = buswidth;
		slave_config.src_maxburst = dma_params->burstsize;
	}

	ret = dmaengine_slave_config(iprtd->dma_chan, &slave_config);
	if (ret)
		return ret;

	return 0;
}

static int snd_imx_pcm_hw_params(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 imx_pcm_runtime_data *iprtd = runtime->private_data;
	unsigned long dma_addr;
	struct dma_chan *chan;
	struct imx_pcm_dma_params *dma_params;
	int ret;

	dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	ret = imx_ssi_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 = (unsigned int *)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_imx_pcm_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_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_imx_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct imx_pcm_dma_params *dma_params;

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

	return 0;
}

static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_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);
		dma_async_issue_pending(iprtd->dma_chan);

		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_imx_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;

	pr_debug("%s: %ld %ld\n", __func__, iprtd->offset,
			bytes_to_frames(substream->runtime, iprtd->offset));

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

static struct snd_pcm_hardware snd_imx_hardware = {
	.info = SNDRV_PCM_INFO_INTERLEAVED |
		SNDRV_PCM_INFO_BLOCK_TRANSFER |
		SNDRV_PCM_INFO_MMAP |
		SNDRV_PCM_INFO_MMAP_VALID |
		SNDRV_PCM_INFO_PAUSE |
		SNDRV_PCM_INFO_RESUME,
	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	.rate_min = 8000,
	.channels_min = 2,
	.channels_max = 2,
	.buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
	.period_bytes_min = 128,
	.period_bytes_max = 65535, /* Limited by SDMA engine */
	.periods_min = 2,
	.periods_max = 255,
	.fifo_size = 0,
};

static int snd_imx_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_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_imx_hardware);

	return 0;
}

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

	kfree(iprtd);

	return 0;
}

static struct snd_pcm_ops imx_pcm_ops = {
	.open		= snd_imx_open,
	.close		= snd_imx_close,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= snd_imx_pcm_hw_params,
	.hw_free	= snd_imx_pcm_hw_free,
	.prepare	= snd_imx_pcm_prepare,
	.trigger	= snd_imx_pcm_trigger,
	.pointer	= snd_imx_pcm_pointer,
	.mmap		= snd_imx_pcm_mmap,
};

static struct snd_soc_platform_driver imx_soc_platform_mx2 = {
	.ops		= &imx_pcm_ops,
	.pcm_new	= imx_pcm_new,
	.pcm_free	= imx_pcm_free,
};

static int __devinit imx_soc_platform_probe(struct platform_device *pdev)
{
	struct imx_ssi *ssi = platform_get_drvdata(pdev);

	ssi->dma_params_tx.burstsize = 6;
	ssi->dma_params_rx.burstsize = 4;

	return snd_soc_register_platform(&pdev->dev, &imx_soc_platform_mx2);
}

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

static struct platform_driver imx_pcm_driver = {
	.driver = {
			.name = "imx-pcm-audio",
			.owner = THIS_MODULE,
	},
	.probe = imx_soc_platform_probe,
	.remove = __devexit_p(imx_soc_platform_remove),
};

module_platform_driver(imx_pcm_driver);
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:imx-pcm-audio");
Commit	Line	Data
8380222e SH	1	/*
	2	* imx-pcm-dma-mx2.c -- ALSA Soc Audio Layer
	3	*
	4	* Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
	5	*
	6	* This code is based on code copyrighted by Freescale,
	7	* Liam Girdwood, Javier Martin and probably others.
	8	*
	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms of the GNU General Public License as published by the
	11	* Free Software Foundation; either version 2 of the License, or (at your
	12	* option) any later version.
	13	*/
	14	#include <linux/clk.h>
	15	#include <linux/delay.h>
	16	#include <linux/device.h>
	17	#include <linux/dma-mapping.h>
	18	#include <linux/init.h>
	19	#include <linux/interrupt.h>
	20	#include <linux/module.h>
	21	#include <linux/platform_device.h>
5a0e3ad6	22	#include <linux/slab.h>
bf974a0d	23	#include <linux/dmaengine.h>
258aea76	24	#include <linux/types.h>
8380222e SH	25
	26	#include <sound/core.h>
	27	#include <sound/initval.h>
	28	#include <sound/pcm.h>
	29	#include <sound/pcm_params.h>
	30	#include <sound/soc.h>
	31
bf974a0d	32	#include <mach/dma.h>
8380222e SH	33
	34	#include "imx-ssi.h"
	35
	36	struct imx_pcm_runtime_data {
bf974a0d	37	int period_bytes;
8380222e	38	int periods;
8380222e	39	int dma;
8380222e SH	40	unsigned long offset;
8380222e SH	41	unsigned long size;
8380222e SH	42	void *buf;
8380222e SH	43	int period_time;
bf974a0d SH	44	struct dma_async_tx_descriptor *desc;
	45	struct dma_chan *dma_chan;
	46	struct imx_dma_data dma_data;
8380222e SH	47	};
8380222e SH	48
bf974a0d	49	static void audio_dma_irq(void *data)
8380222e	50	{
bf974a0d	51	struct snd_pcm_substream substream = (struct snd_pcm_substream )data;
8380222e SH	52	struct snd_pcm_runtime *runtime = substream->runtime;
	53	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	54
bf974a0d SH	55	iprtd->offset += iprtd->period_bytes;
bf974a0d SH	56	iprtd->offset %= iprtd->period_bytes * iprtd->periods;
8380222e	57
bf974a0d	58	snd_pcm_period_elapsed(substream);
8380222e SH	59	}
8380222e SH	60
bf974a0d	61	static bool filter(struct dma_chan chan, void param)
8380222e	62	{
bf974a0d	63	struct imx_pcm_runtime_data *iprtd = param;
8380222e	64
bf974a0d SH	65	if (!imx_dma_is_general_purpose(chan))
bf974a0d SH	66	return false;
8380222e	67
bf974a0d	68	chan->private = &iprtd->dma_data;
671999cb	69
bf974a0d	70	return true;
8380222e SH	71	}
8380222e SH	72
bf974a0d SH	73	static int imx_ssi_dma_alloc(struct snd_pcm_substream *substream,
bf974a0d SH	74	struct snd_pcm_hw_params *params)
8380222e SH	75	{
8380222e SH	76	struct snd_soc_pcm_runtime *rtd = substream->private_data;
5f712b2b	77	struct imx_pcm_dma_params *dma_params;
8380222e SH	78	struct snd_pcm_runtime *runtime = substream->runtime;
8380222e SH	79	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
bf974a0d SH	80	struct dma_slave_config slave_config;
	81	dma_cap_mask_t mask;
	82	enum dma_slave_buswidth buswidth;
8380222e SH	83	int ret;
8380222e SH	84
f0fba2ad	85	dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
5f712b2b	86
bf974a0d SH	87	iprtd->dma_data.peripheral_type = IMX_DMATYPE_SSI;
	88	iprtd->dma_data.priority = DMA_PRIO_HIGH;
	89	iprtd->dma_data.dma_request = dma_params->dma;
8380222e	90
bf974a0d	91	/* Try to grab a DMA channel */
220d9f25 JM	92	if (!iprtd->dma_chan) {
	93	dma_cap_zero(mask);
	94	dma_cap_set(DMA_SLAVE, mask);
	95	iprtd->dma_chan = dma_request_channel(mask, filter, iprtd);
	96	if (!iprtd->dma_chan)
	97	return -EINVAL;
	98	}
8380222e	99
bf974a0d SH	100	switch (params_format(params)) {
	101	case SNDRV_PCM_FORMAT_S16_LE:
	102	buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
	103	break;
	104	case SNDRV_PCM_FORMAT_S20_3LE:
	105	case SNDRV_PCM_FORMAT_S24_LE:
	106	buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
	107	break;
	108	default:
	109	return 0;
8380222e SH	110	}
8380222e SH	111
258aea76 VK	112	slave_config.device_fc = false;
258aea76 VK	113
bf974a0d	114	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
35e16581	115	slave_config.direction = DMA_MEM_TO_DEV;
bf974a0d SH	116	slave_config.dst_addr = dma_params->dma_addr;
bf974a0d SH	117	slave_config.dst_addr_width = buswidth;
6584cb88	118	slave_config.dst_maxburst = dma_params->burstsize;
bf974a0d	119	} else {
35e16581	120	slave_config.direction = DMA_DEV_TO_MEM;
bf974a0d SH	121	slave_config.src_addr = dma_params->dma_addr;
bf974a0d SH	122	slave_config.src_addr_width = buswidth;
6584cb88	123	slave_config.src_maxburst = dma_params->burstsize;
8380222e SH	124	}
8380222e SH	125
bf974a0d SH	126	ret = dmaengine_slave_config(iprtd->dma_chan, &slave_config);
	127	if (ret)
	128	return ret;
8380222e SH	129
8380222e SH	130	return 0;
8380222e SH	131	}
	132
	133	static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
	134	struct snd_pcm_hw_params *params)
	135	{
bf974a0d	136	struct snd_soc_pcm_runtime *rtd = substream->private_data;
8380222e SH	137	struct snd_pcm_runtime *runtime = substream->runtime;
8380222e SH	138	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
8380222e	139	unsigned long dma_addr;
bf974a0d SH	140	struct dma_chan *chan;
	141	struct imx_pcm_dma_params *dma_params;
	142	int ret;
8380222e	143
bf974a0d SH	144	dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	145	ret = imx_ssi_dma_alloc(substream, params);
	146	if (ret)
	147	return ret;
	148	chan = iprtd->dma_chan;
8380222e SH	149
	150	iprtd->size = params_buffer_bytes(params);
	151	iprtd->periods = params_periods(params);
bf974a0d	152	iprtd->period_bytes = params_period_bytes(params);
8380222e SH	153	iprtd->offset = 0;
	154	iprtd->period_time = HZ / (params_rate(params) /
	155	params_period_size(params));
	156
	157	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	158
8380222e SH	159	dma_addr = runtime->dma_addr;
8380222e SH	160
bf974a0d SH	161	iprtd->buf = (unsigned int *)substream->dma_buffer.area;
bf974a0d SH	162
16052827	163	iprtd->desc = dmaengine_prep_dma_cyclic(chan, dma_addr,
bf974a0d SH	164	iprtd->period_bytes * iprtd->periods,
	165	iprtd->period_bytes,
	166	substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
35e16581	167	DMA_MEM_TO_DEV : DMA_DEV_TO_MEM);
bf974a0d SH	168	if (!iprtd->desc) {
	169	dev_err(&chan->dev->device, "cannot prepare slave dma\n");
	170	return -EINVAL;
8380222e SH	171	}
8380222e SH	172
bf974a0d SH	173	iprtd->desc->callback = audio_dma_irq;
	174	iprtd->desc->callback_param = substream;
	175
8380222e SH	176	return 0;
	177	}
	178
	179	static int snd_imx_pcm_hw_free(struct snd_pcm_substream *substream)
	180	{
	181	struct snd_pcm_runtime *runtime = substream->runtime;
	182	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	183
bf974a0d SH	184	if (iprtd->dma_chan) {
	185	dma_release_channel(iprtd->dma_chan);
	186	iprtd->dma_chan = NULL;
8380222e SH	187	}
8380222e SH	188
8380222e SH	189	return 0;
	190	}
	191
	192	static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
	193	{
8380222e	194	struct snd_soc_pcm_runtime *rtd = substream->private_data;
5f712b2b	195	struct imx_pcm_dma_params *dma_params;
8380222e	196
f0fba2ad	197	dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
5f712b2b	198
8380222e SH	199	return 0;
	200	}
	201
	202	static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	203	{
	204	struct snd_pcm_runtime *runtime = substream->runtime;
	205	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	206
	207	switch (cmd) {
	208	case SNDRV_PCM_TRIGGER_START:
	209	case SNDRV_PCM_TRIGGER_RESUME:
	210	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
bf974a0d	211	dmaengine_submit(iprtd->desc);
c0fa6c8a	212	dma_async_issue_pending(iprtd->dma_chan);
8380222e SH	213
	214	break;
	215
	216	case SNDRV_PCM_TRIGGER_STOP:
	217	case SNDRV_PCM_TRIGGER_SUSPEND:
	218	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
bf974a0d	219	dmaengine_terminate_all(iprtd->dma_chan);
8380222e SH	220
	221	break;
	222	default:
	223	return -EINVAL;
	224	}
	225
	226	return 0;
	227	}
	228
	229	static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
	230	{
	231	struct snd_pcm_runtime *runtime = substream->runtime;
	232	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	233
bf974a0d SH	234	pr_debug("%s: %ld %ld\n", __func__, iprtd->offset,
	235	bytes_to_frames(substream->runtime, iprtd->offset));
	236
8380222e SH	237	return bytes_to_frames(substream->runtime, iprtd->offset);
	238	}
	239
	240	static struct snd_pcm_hardware snd_imx_hardware = {
	241	.info = SNDRV_PCM_INFO_INTERLEAVED \|
	242	SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	243	SNDRV_PCM_INFO_MMAP \|
	244	SNDRV_PCM_INFO_MMAP_VALID \|
	245	SNDRV_PCM_INFO_PAUSE \|
	246	SNDRV_PCM_INFO_RESUME,
	247	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	248	.rate_min = 8000,
	249	.channels_min = 2,
	250	.channels_max = 2,
	251	.buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
	252	.period_bytes_min = 128,
bf974a0d	253	.period_bytes_max = 65535, /* Limited by SDMA engine */
8380222e SH	254	.periods_min = 2,
	255	.periods_max = 255,
	256	.fifo_size = 0,
	257	};
	258
	259	static int snd_imx_open(struct snd_pcm_substream *substream)
	260	{
	261	struct snd_pcm_runtime *runtime = substream->runtime;
	262	struct imx_pcm_runtime_data *iprtd;
	263	int ret;
	264
	265	iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
51b6dfb6 KV	266	if (iprtd == NULL)
51b6dfb6 KV	267	return -ENOMEM;
8380222e SH	268	runtime->private_data = iprtd;
	269
	270	ret = snd_pcm_hw_constraint_integer(substream->runtime,
	271	SNDRV_PCM_HW_PARAM_PERIODS);
51b6dfb6 KV	272	if (ret < 0) {
51b6dfb6 KV	273	kfree(iprtd);
8380222e	274	return ret;
51b6dfb6	275	}
8380222e SH	276
8380222e SH	277	snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
bf974a0d SH	278
	279	return 0;
	280	}
	281
	282	static int snd_imx_close(struct snd_pcm_substream *substream)
	283	{
	284	struct snd_pcm_runtime *runtime = substream->runtime;
	285	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	286
	287	kfree(iprtd);
	288
8380222e SH	289	return 0;
	290	}
	291
	292	static struct snd_pcm_ops imx_pcm_ops = {
	293	.open = snd_imx_open,
bf974a0d	294	.close = snd_imx_close,
8380222e SH	295	.ioctl = snd_pcm_lib_ioctl,
	296	.hw_params = snd_imx_pcm_hw_params,
	297	.hw_free = snd_imx_pcm_hw_free,
	298	.prepare = snd_imx_pcm_prepare,
	299	.trigger = snd_imx_pcm_trigger,
	300	.pointer = snd_imx_pcm_pointer,
	301	.mmap = snd_imx_pcm_mmap,
	302	};
	303
f0fba2ad LG	304	static struct snd_soc_platform_driver imx_soc_platform_mx2 = {
f0fba2ad LG	305	.ops = &imx_pcm_ops,
8380222e SH	306	.pcm_new = imx_pcm_new,
	307	.pcm_free = imx_pcm_free,
	308	};
	309
f0fba2ad	310	static int __devinit imx_soc_platform_probe(struct platform_device *pdev)
8380222e	311	{
2c4cf17a WS	312	struct imx_ssi *ssi = platform_get_drvdata(pdev);
	313
	314	ssi->dma_params_tx.burstsize = 6;
	315	ssi->dma_params_rx.burstsize = 4;
	316
f0fba2ad LG	317	return snd_soc_register_platform(&pdev->dev, &imx_soc_platform_mx2);
	318	}
	319
	320	static int __devexit imx_soc_platform_remove(struct platform_device *pdev)
	321	{
	322	snd_soc_unregister_platform(&pdev->dev);
	323	return 0;
	324	}
	325
	326	static struct platform_driver imx_pcm_driver = {
	327	.driver = {
	328	.name = "imx-pcm-audio",
	329	.owner = THIS_MODULE,
	330	},
f0fba2ad LG	331	.probe = imx_soc_platform_probe,
	332	.remove = __devexit_p(imx_soc_platform_remove),
	333	};
	334
7a24b2ba	335	module_platform_driver(imx_pcm_driver);
96dcabb9 APR	336	MODULE_LICENSE("GPL");
96dcabb9 APR	337	MODULE_ALIAS("platform:imx-pcm-audio");