[deliverable/linux.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 <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 */
	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;
	}

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		slave_config.direction = DMA_TO_DEVICE;
		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_FROM_DEVICE;
		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 = chan->device->device_prep_dma_cyclic(chan, dma_addr,
			iprtd->period_bytes * iprtd->periods,
			iprtd->period_bytes,
			substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
			DMA_TO_DEVICE : DMA_FROM_DEVICE);
	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);

		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),
};

static int __init snd_imx_pcm_init(void)
{
	return platform_driver_register(&imx_pcm_driver);
}
module_init(snd_imx_pcm_init);

static void __exit snd_imx_pcm_exit(void)
{
	platform_driver_unregister(&imx_pcm_driver);
}
module_exit(snd_imx_pcm_exit);
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>
8380222e SH	24
	25	#include <sound/core.h>
	26	#include <sound/initval.h>
	27	#include <sound/pcm.h>
	28	#include <sound/pcm_params.h>
	29	#include <sound/soc.h>
	30
bf974a0d	31	#include <mach/dma.h>
8380222e SH	32
	33	#include "imx-ssi.h"
	34
	35	struct imx_pcm_runtime_data {
bf974a0d	36	int period_bytes;
8380222e	37	int periods;
8380222e	38	int dma;
8380222e SH	39	unsigned long offset;
8380222e SH	40	unsigned long size;
8380222e SH	41	void *buf;
8380222e SH	42	int period_time;
bf974a0d SH	43	struct dma_async_tx_descriptor *desc;
	44	struct dma_chan *dma_chan;
	45	struct imx_dma_data dma_data;
8380222e SH	46	};
8380222e SH	47
bf974a0d	48	static void audio_dma_irq(void *data)
8380222e	49	{
bf974a0d	50	struct snd_pcm_substream substream = (struct snd_pcm_substream )data;
8380222e SH	51	struct snd_pcm_runtime *runtime = substream->runtime;
	52	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	53
bf974a0d SH	54	iprtd->offset += iprtd->period_bytes;
bf974a0d SH	55	iprtd->offset %= iprtd->period_bytes * iprtd->periods;
8380222e	56
bf974a0d	57	snd_pcm_period_elapsed(substream);
8380222e SH	58	}
8380222e SH	59
bf974a0d	60	static bool filter(struct dma_chan chan, void param)
8380222e	61	{
bf974a0d	62	struct imx_pcm_runtime_data *iprtd = param;
8380222e	63
bf974a0d SH	64	if (!imx_dma_is_general_purpose(chan))
bf974a0d SH	65	return false;
8380222e	66
bf974a0d	67	chan->private = &iprtd->dma_data;
671999cb	68
bf974a0d	69	return true;
8380222e SH	70	}
8380222e SH	71
bf974a0d SH	72	static int imx_ssi_dma_alloc(struct snd_pcm_substream *substream,
bf974a0d SH	73	struct snd_pcm_hw_params *params)
8380222e SH	74	{
8380222e SH	75	struct snd_soc_pcm_runtime *rtd = substream->private_data;
5f712b2b	76	struct imx_pcm_dma_params *dma_params;
8380222e SH	77	struct snd_pcm_runtime *runtime = substream->runtime;
8380222e SH	78	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
bf974a0d SH	79	struct dma_slave_config slave_config;
	80	dma_cap_mask_t mask;
	81	enum dma_slave_buswidth buswidth;
8380222e SH	82	int ret;
8380222e SH	83
f0fba2ad	84	dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
5f712b2b	85
bf974a0d SH	86	iprtd->dma_data.peripheral_type = IMX_DMATYPE_SSI;
	87	iprtd->dma_data.priority = DMA_PRIO_HIGH;
	88	iprtd->dma_data.dma_request = dma_params->dma;
8380222e	89
bf974a0d SH	90	/* Try to grab a DMA channel */
	91	dma_cap_zero(mask);
	92	dma_cap_set(DMA_SLAVE, mask);
	93	iprtd->dma_chan = dma_request_channel(mask, filter, iprtd);
	94	if (!iprtd->dma_chan)
	95	return -EINVAL;
8380222e	96
bf974a0d SH	97	switch (params_format(params)) {
	98	case SNDRV_PCM_FORMAT_S16_LE:
	99	buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
	100	break;
	101	case SNDRV_PCM_FORMAT_S20_3LE:
	102	case SNDRV_PCM_FORMAT_S24_LE:
	103	buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
	104	break;
	105	default:
	106	return 0;
8380222e SH	107	}
8380222e SH	108
bf974a0d SH	109	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	110	slave_config.direction = DMA_TO_DEVICE;
	111	slave_config.dst_addr = dma_params->dma_addr;
	112	slave_config.dst_addr_width = buswidth;
	113	slave_config.dst_maxburst = dma_params->burstsize;
	114	} else {
	115	slave_config.direction = DMA_FROM_DEVICE;
	116	slave_config.src_addr = dma_params->dma_addr;
	117	slave_config.src_addr_width = buswidth;
	118	slave_config.src_maxburst = dma_params->burstsize;
8380222e SH	119	}
8380222e SH	120
bf974a0d SH	121	ret = dmaengine_slave_config(iprtd->dma_chan, &slave_config);
	122	if (ret)
	123	return ret;
8380222e SH	124
8380222e SH	125	return 0;
8380222e SH	126	}
	127
	128	static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
	129	struct snd_pcm_hw_params *params)
	130	{
bf974a0d	131	struct snd_soc_pcm_runtime *rtd = substream->private_data;
8380222e SH	132	struct snd_pcm_runtime *runtime = substream->runtime;
8380222e SH	133	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
8380222e	134	unsigned long dma_addr;
bf974a0d SH	135	struct dma_chan *chan;
	136	struct imx_pcm_dma_params *dma_params;
	137	int ret;
8380222e	138
bf974a0d SH	139	dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	140	ret = imx_ssi_dma_alloc(substream, params);
	141	if (ret)
	142	return ret;
	143	chan = iprtd->dma_chan;
8380222e SH	144
	145	iprtd->size = params_buffer_bytes(params);
	146	iprtd->periods = params_periods(params);
bf974a0d	147	iprtd->period_bytes = params_period_bytes(params);
8380222e SH	148	iprtd->offset = 0;
	149	iprtd->period_time = HZ / (params_rate(params) /
	150	params_period_size(params));
	151
	152	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	153
8380222e SH	154	dma_addr = runtime->dma_addr;
8380222e SH	155
bf974a0d SH	156	iprtd->buf = (unsigned int *)substream->dma_buffer.area;
	157
	158	iprtd->desc = chan->device->device_prep_dma_cyclic(chan, dma_addr,
	159	iprtd->period_bytes * iprtd->periods,
	160	iprtd->period_bytes,
	161	substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
	162	DMA_TO_DEVICE : DMA_FROM_DEVICE);
	163	if (!iprtd->desc) {
	164	dev_err(&chan->dev->device, "cannot prepare slave dma\n");
	165	return -EINVAL;
8380222e SH	166	}
8380222e SH	167
bf974a0d SH	168	iprtd->desc->callback = audio_dma_irq;
	169	iprtd->desc->callback_param = substream;
	170
8380222e SH	171	return 0;
	172	}
	173
	174	static int snd_imx_pcm_hw_free(struct snd_pcm_substream *substream)
	175	{
	176	struct snd_pcm_runtime *runtime = substream->runtime;
	177	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	178
bf974a0d SH	179	if (iprtd->dma_chan) {
	180	dma_release_channel(iprtd->dma_chan);
	181	iprtd->dma_chan = NULL;
8380222e SH	182	}
8380222e SH	183
8380222e SH	184	return 0;
	185	}
	186
	187	static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
	188	{
8380222e	189	struct snd_soc_pcm_runtime *rtd = substream->private_data;
5f712b2b	190	struct imx_pcm_dma_params *dma_params;
8380222e	191
f0fba2ad	192	dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
5f712b2b	193
8380222e SH	194	return 0;
	195	}
	196
	197	static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	198	{
	199	struct snd_pcm_runtime *runtime = substream->runtime;
	200	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	201
	202	switch (cmd) {
	203	case SNDRV_PCM_TRIGGER_START:
	204	case SNDRV_PCM_TRIGGER_RESUME:
	205	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
bf974a0d	206	dmaengine_submit(iprtd->desc);
8380222e SH	207
	208	break;
	209
	210	case SNDRV_PCM_TRIGGER_STOP:
	211	case SNDRV_PCM_TRIGGER_SUSPEND:
	212	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
bf974a0d	213	dmaengine_terminate_all(iprtd->dma_chan);
8380222e SH	214
	215	break;
	216	default:
	217	return -EINVAL;
	218	}
	219
	220	return 0;
	221	}
	222
	223	static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
	224	{
	225	struct snd_pcm_runtime *runtime = substream->runtime;
	226	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	227
bf974a0d SH	228	pr_debug("%s: %ld %ld\n", __func__, iprtd->offset,
	229	bytes_to_frames(substream->runtime, iprtd->offset));
	230
8380222e SH	231	return bytes_to_frames(substream->runtime, iprtd->offset);
	232	}
	233
	234	static struct snd_pcm_hardware snd_imx_hardware = {
	235	.info = SNDRV_PCM_INFO_INTERLEAVED \|
	236	SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	237	SNDRV_PCM_INFO_MMAP \|
	238	SNDRV_PCM_INFO_MMAP_VALID \|
	239	SNDRV_PCM_INFO_PAUSE \|
	240	SNDRV_PCM_INFO_RESUME,
	241	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	242	.rate_min = 8000,
	243	.channels_min = 2,
	244	.channels_max = 2,
	245	.buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
	246	.period_bytes_min = 128,
bf974a0d	247	.period_bytes_max = 65535, /* Limited by SDMA engine */
8380222e SH	248	.periods_min = 2,
	249	.periods_max = 255,
	250	.fifo_size = 0,
	251	};
	252
	253	static int snd_imx_open(struct snd_pcm_substream *substream)
	254	{
	255	struct snd_pcm_runtime *runtime = substream->runtime;
	256	struct imx_pcm_runtime_data *iprtd;
	257	int ret;
	258
	259	iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
51b6dfb6 KV	260	if (iprtd == NULL)
51b6dfb6 KV	261	return -ENOMEM;
8380222e SH	262	runtime->private_data = iprtd;
	263
	264	ret = snd_pcm_hw_constraint_integer(substream->runtime,
	265	SNDRV_PCM_HW_PARAM_PERIODS);
51b6dfb6 KV	266	if (ret < 0) {
51b6dfb6 KV	267	kfree(iprtd);
8380222e	268	return ret;
51b6dfb6	269	}
8380222e SH	270
8380222e SH	271	snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
bf974a0d SH	272
	273	return 0;
	274	}
	275
	276	static int snd_imx_close(struct snd_pcm_substream *substream)
	277	{
	278	struct snd_pcm_runtime *runtime = substream->runtime;
	279	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	280
	281	kfree(iprtd);
	282
8380222e SH	283	return 0;
	284	}
	285
	286	static struct snd_pcm_ops imx_pcm_ops = {
	287	.open = snd_imx_open,
bf974a0d	288	.close = snd_imx_close,
8380222e SH	289	.ioctl = snd_pcm_lib_ioctl,
	290	.hw_params = snd_imx_pcm_hw_params,
	291	.hw_free = snd_imx_pcm_hw_free,
	292	.prepare = snd_imx_pcm_prepare,
	293	.trigger = snd_imx_pcm_trigger,
	294	.pointer = snd_imx_pcm_pointer,
	295	.mmap = snd_imx_pcm_mmap,
	296	};
	297
f0fba2ad LG	298	static struct snd_soc_platform_driver imx_soc_platform_mx2 = {
f0fba2ad LG	299	.ops = &imx_pcm_ops,
8380222e SH	300	.pcm_new = imx_pcm_new,
	301	.pcm_free = imx_pcm_free,
	302	};
	303
f0fba2ad	304	static int __devinit imx_soc_platform_probe(struct platform_device *pdev)
8380222e	305	{
2c4cf17a WS	306	struct imx_ssi *ssi = platform_get_drvdata(pdev);
	307
	308	ssi->dma_params_tx.burstsize = 6;
	309	ssi->dma_params_rx.burstsize = 4;
	310
f0fba2ad LG	311	return snd_soc_register_platform(&pdev->dev, &imx_soc_platform_mx2);
	312	}
	313
	314	static int __devexit imx_soc_platform_remove(struct platform_device *pdev)
	315	{
	316	snd_soc_unregister_platform(&pdev->dev);
	317	return 0;
	318	}
	319
	320	static struct platform_driver imx_pcm_driver = {
	321	.driver = {
	322	.name = "imx-pcm-audio",
	323	.owner = THIS_MODULE,
	324	},
f0fba2ad LG	325	.probe = imx_soc_platform_probe,
	326	.remove = __devexit_p(imx_soc_platform_remove),
	327	};
	328
	329	static int __init snd_imx_pcm_init(void)
	330	{
	331	return platform_driver_register(&imx_pcm_driver);
	332	}
	333	module_init(snd_imx_pcm_init);
	334
	335	static void __exit snd_imx_pcm_exit(void)
	336	{
	337	platform_driver_unregister(&imx_pcm_driver);
8380222e	338	}
f0fba2ad	339	module_exit(snd_imx_pcm_exit);