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

#include <mach/dma-mx1-mx2.h>

#include "imx-ssi.h"

struct imx_pcm_runtime_data {
	int sg_count;
	struct scatterlist *sg_list;
	int period;
	int periods;
	unsigned long dma_addr;
	int dma;
	struct snd_pcm_substream *substream;
	unsigned long offset;
	unsigned long size;
	unsigned long period_cnt;
	void *buf;
	int period_time;
};

/* Called by the DMA framework when a period has elapsed */
static void imx_ssi_dma_progression(int channel, void *data,
					struct scatterlist *sg)
{
	struct snd_pcm_substream *substream = data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;

	if (!sg)
		return;

	runtime = iprtd->substream->runtime;

	iprtd->offset = sg->dma_address - runtime->dma_addr;

	snd_pcm_period_elapsed(iprtd->substream);
}

static void imx_ssi_dma_callback(int channel, void *data)
{
	pr_err("%s shouldn't be called\n", __func__);
}

static void snd_imx_dma_err_callback(int channel, void *data, int err)
{
	struct snd_pcm_substream *substream = data;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct imx_pcm_dma_params *dma_params = 
		snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	int ret;

	pr_err("DMA timeout on channel %d -%s%s%s%s\n",
		 channel,
		 err & IMX_DMA_ERR_BURST ?    " burst" : "",
		 err & IMX_DMA_ERR_REQUEST ?  " request" : "",
		 err & IMX_DMA_ERR_TRANSFER ? " transfer" : "",
		 err & IMX_DMA_ERR_BUFFER ?   " buffer" : "");

	imx_dma_disable(iprtd->dma);
	ret = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,
			IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
			substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
			DMA_MODE_WRITE : DMA_MODE_READ);
	if (!ret)
		imx_dma_enable(iprtd->dma);
}

static int imx_ssi_dma_alloc(struct snd_pcm_substream *substream)
{
	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;
	int ret;

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

	iprtd->dma = imx_dma_request_by_prio(DRV_NAME, DMA_PRIO_HIGH);
	if (iprtd->dma < 0) {
		pr_err("Failed to claim the audio DMA\n");
		return -ENODEV;
	}

	ret = imx_dma_setup_handlers(iprtd->dma,
				imx_ssi_dma_callback,
				snd_imx_dma_err_callback, substream);
	if (ret)
		goto out;

	ret = imx_dma_setup_progression_handler(iprtd->dma,
			imx_ssi_dma_progression);
	if (ret) {
		pr_err("Failed to setup the DMA handler\n");
		goto out;
	}

	ret = imx_dma_config_channel(iprtd->dma,
			IMX_DMA_MEMSIZE_16 | IMX_DMA_TYPE_FIFO,
			IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR,
			dma_params->dma, 1);
	if (ret < 0) {
		pr_err("Cannot configure DMA channel: %d\n", ret);
		goto out;
	}

	imx_dma_config_burstlen(iprtd->dma, dma_params->burstsize * 2);

	return 0;
out:
	imx_dma_free(iprtd->dma);
	return ret;
}

static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	int i;
	unsigned long dma_addr;

	imx_ssi_dma_alloc(substream);

	iprtd->size = params_buffer_bytes(params);
	iprtd->periods = params_periods(params);
	iprtd->period = 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);

	if (iprtd->sg_count != iprtd->periods) {
		kfree(iprtd->sg_list);

		iprtd->sg_list = kcalloc(iprtd->periods + 1,
				sizeof(struct scatterlist), GFP_KERNEL);
		if (!iprtd->sg_list)
			return -ENOMEM;
		iprtd->sg_count = iprtd->periods + 1;
	}

	sg_init_table(iprtd->sg_list, iprtd->sg_count);
	dma_addr = runtime->dma_addr;

	for (i = 0; i < iprtd->periods; i++) {
		iprtd->sg_list[i].page_link = 0;
		iprtd->sg_list[i].offset = 0;
		iprtd->sg_list[i].dma_address = dma_addr;
		iprtd->sg_list[i].length = iprtd->period;
		dma_addr += iprtd->period;
	}

	/* close the loop */
	iprtd->sg_list[iprtd->sg_count - 1].offset = 0;
	iprtd->sg_list[iprtd->sg_count - 1].length = 0;
	iprtd->sg_list[iprtd->sg_count - 1].page_link =
			((unsigned long) iprtd->sg_list | 0x01) & ~0x02;
	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 >= 0) {
		imx_dma_free(iprtd->dma);
		iprtd->dma = -EINVAL;
	}

	kfree(iprtd->sg_list);
	iprtd->sg_list = NULL;

	return 0;
}

static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct imx_pcm_dma_params *dma_params;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	int err;

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

	iprtd->substream = substream;
	iprtd->buf = (unsigned int *)substream->dma_buffer.area;
	iprtd->period_cnt = 0;

	pr_debug("%s: buf: %p period: %d periods: %d\n",
			__func__, iprtd->buf, iprtd->period, iprtd->periods);

	err = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,
			IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
			substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
			DMA_MODE_WRITE : DMA_MODE_READ);
	if (err)
		return err;

	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:
		imx_dma_enable(iprtd->dma);

		break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		imx_dma_disable(iprtd->dma);

		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;

	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 = 16 * 1024,
	.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);
	runtime->private_data = iprtd;

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

	snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
	return 0;
}

static struct snd_pcm_ops imx_pcm_ops = {
	.open		= snd_imx_open,
	.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 imx_soc_platform_dma = {
	.name		= "imx-audio",
	.pcm_ops 	= &imx_pcm_ops,
	.pcm_new	= imx_pcm_new,
	.pcm_free	= imx_pcm_free,
};

struct snd_soc_platform *imx_ssi_dma_mx2_init(struct platform_device *pdev,
		struct imx_ssi *ssi)
{
	ssi->dma_params_tx.burstsize = DMA_TXFIFO_BURST;
	ssi->dma_params_rx.burstsize = DMA_RXFIFO_BURST;

	return &imx_soc_platform_dma;
}
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>
8380222e SH	23
	24	#include <sound/core.h>
	25	#include <sound/initval.h>
	26	#include <sound/pcm.h>
	27	#include <sound/pcm_params.h>
	28	#include <sound/soc.h>
	29
	30	#include <mach/dma-mx1-mx2.h>
	31
	32	#include "imx-ssi.h"
	33
	34	struct imx_pcm_runtime_data {
	35	int sg_count;
	36	struct scatterlist *sg_list;
	37	int period;
	38	int periods;
	39	unsigned long dma_addr;
	40	int dma;
	41	struct snd_pcm_substream *substream;
	42	unsigned long offset;
	43	unsigned long size;
	44	unsigned long period_cnt;
	45	void *buf;
	46	int period_time;
	47	};
	48
	49	/* Called by the DMA framework when a period has elapsed */
	50	static void imx_ssi_dma_progression(int channel, void *data,
	51	struct scatterlist *sg)
	52	{
	53	struct snd_pcm_substream *substream = data;
	54	struct snd_pcm_runtime *runtime = substream->runtime;
	55	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	56
	57	if (!sg)
	58	return;
	59
	60	runtime = iprtd->substream->runtime;
	61
	62	iprtd->offset = sg->dma_address - runtime->dma_addr;
	63
	64	snd_pcm_period_elapsed(iprtd->substream);
	65	}
	66
	67	static void imx_ssi_dma_callback(int channel, void *data)
	68	{
	69	pr_err("%s shouldn't be called\n", __func__);
	70	}
	71
	72	static void snd_imx_dma_err_callback(int channel, void *data, int err)
	73	{
671999cb SH	74	struct snd_pcm_substream *substream = data;
671999cb SH	75	struct snd_soc_pcm_runtime *rtd = substream->private_data;
e2b3e622 SL	76	struct imx_pcm_dma_params *dma_params =
e2b3e622 SL	77	snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
671999cb SH	78	struct snd_pcm_runtime *runtime = substream->runtime;
	79	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	80	int ret;
8380222e SH	81
	82	pr_err("DMA timeout on channel %d -%s%s%s%s\n",
	83	channel,
	84	err & IMX_DMA_ERR_BURST ? " burst" : "",
	85	err & IMX_DMA_ERR_REQUEST ? " request" : "",
	86	err & IMX_DMA_ERR_TRANSFER ? " transfer" : "",
	87	err & IMX_DMA_ERR_BUFFER ? " buffer" : "");
671999cb SH	88
	89	imx_dma_disable(iprtd->dma);
	90	ret = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,
	91	IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
	92	substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
	93	DMA_MODE_WRITE : DMA_MODE_READ);
	94	if (!ret)
	95	imx_dma_enable(iprtd->dma);
8380222e SH	96	}
	97
	98	static int imx_ssi_dma_alloc(struct snd_pcm_substream *substream)
	99	{
	100	struct snd_soc_pcm_runtime *rtd = substream->private_data;
5f712b2b	101	struct imx_pcm_dma_params *dma_params;
8380222e SH	102	struct snd_pcm_runtime *runtime = substream->runtime;
	103	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	104	int ret;
	105
e2b3e622	106	dma_params = snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
5f712b2b	107
8380222e SH	108	iprtd->dma = imx_dma_request_by_prio(DRV_NAME, DMA_PRIO_HIGH);
	109	if (iprtd->dma < 0) {
	110	pr_err("Failed to claim the audio DMA\n");
	111	return -ENODEV;
	112	}
	113
	114	ret = imx_dma_setup_handlers(iprtd->dma,
	115	imx_ssi_dma_callback,
	116	snd_imx_dma_err_callback, substream);
	117	if (ret)
	118	goto out;
	119
	120	ret = imx_dma_setup_progression_handler(iprtd->dma,
	121	imx_ssi_dma_progression);
	122	if (ret) {
	123	pr_err("Failed to setup the DMA handler\n");
	124	goto out;
	125	}
	126
	127	ret = imx_dma_config_channel(iprtd->dma,
	128	IMX_DMA_MEMSIZE_16 \| IMX_DMA_TYPE_FIFO,
	129	IMX_DMA_MEMSIZE_32 \| IMX_DMA_TYPE_LINEAR,
	130	dma_params->dma, 1);
	131	if (ret < 0) {
	132	pr_err("Cannot configure DMA channel: %d\n", ret);
	133	goto out;
	134	}
	135
	136	imx_dma_config_burstlen(iprtd->dma, dma_params->burstsize * 2);
	137
	138	return 0;
	139	out:
	140	imx_dma_free(iprtd->dma);
	141	return ret;
	142	}
	143
	144	static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
	145	struct snd_pcm_hw_params *params)
	146	{
	147	struct snd_pcm_runtime *runtime = substream->runtime;
	148	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	149	int i;
	150	unsigned long dma_addr;
	151
	152	imx_ssi_dma_alloc(substream);
	153
	154	iprtd->size = params_buffer_bytes(params);
	155	iprtd->periods = params_periods(params);
	156	iprtd->period = params_period_bytes(params);
	157	iprtd->offset = 0;
	158	iprtd->period_time = HZ / (params_rate(params) /
	159	params_period_size(params));
	160
	161	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	162
	163	if (iprtd->sg_count != iprtd->periods) {
	164	kfree(iprtd->sg_list);
	165
	166	iprtd->sg_list = kcalloc(iprtd->periods + 1,
	167	sizeof(struct scatterlist), GFP_KERNEL);
	168	if (!iprtd->sg_list)
	169	return -ENOMEM;
	170	iprtd->sg_count = iprtd->periods + 1;
	171	}
172
173	sg_init_table(iprtd->sg_list, iprtd->sg_count);
174	dma_addr = runtime->dma_addr;
175
176	for (i = 0; i < iprtd->periods; i++) {
177	iprtd->sg_list[i].page_link = 0;
178	iprtd->sg_list[i].offset = 0;
179	iprtd->sg_list[i].dma_address = dma_addr;
180	iprtd->sg_list[i].length = iprtd->period;
181	dma_addr += iprtd->period;
182	}
183
184	/* close the loop */
185	iprtd->sg_list[iprtd->sg_count - 1].offset = 0;
186	iprtd->sg_list[iprtd->sg_count - 1].length = 0;
187	iprtd->sg_list[iprtd->sg_count - 1].page_link =
188	((unsigned long) iprtd->sg_list \| 0x01) & ~0x02;
189	return 0;
190	}
191
192	static int snd_imx_pcm_hw_free(struct snd_pcm_substream *substream)
193	{
194	struct snd_pcm_runtime *runtime = substream->runtime;
195	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
196
197	if (iprtd->dma >= 0) {
198	imx_dma_free(iprtd->dma);
199	iprtd->dma = -EINVAL;
200	}
201
202	kfree(iprtd->sg_list);
203	iprtd->sg_list = NULL;
204
205	return 0;
206	}
207
208	static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
209	{
210	struct snd_pcm_runtime *runtime = substream->runtime;
211	struct snd_soc_pcm_runtime *rtd = substream->private_data;
5f712b2b	212	struct imx_pcm_dma_params *dma_params;
8380222e SH	213	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	214	int err;
	215
e2b3e622	216	dma_params = snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
5f712b2b	217
8380222e SH	218	iprtd->substream = substream;
	219	iprtd->buf = (unsigned int *)substream->dma_buffer.area;
	220	iprtd->period_cnt = 0;
	221
	222	pr_debug("%s: buf: %p period: %d periods: %d\n",
	223	__func__, iprtd->buf, iprtd->period, iprtd->periods);
	224
	225	err = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,
	226	IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
	227	substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
	228	DMA_MODE_WRITE : DMA_MODE_READ);
	229	if (err)
	230	return err;
	231
	232	return 0;
	233	}
	234
	235	static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	236	{
	237	struct snd_pcm_runtime *runtime = substream->runtime;
	238	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	239
	240	switch (cmd) {
	241	case SNDRV_PCM_TRIGGER_START:
	242	case SNDRV_PCM_TRIGGER_RESUME:
	243	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	244	imx_dma_enable(iprtd->dma);
	245
	246	break;
	247
	248	case SNDRV_PCM_TRIGGER_STOP:
	249	case SNDRV_PCM_TRIGGER_SUSPEND:
	250	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	251	imx_dma_disable(iprtd->dma);
	252
	253	break;
	254	default:
	255	return -EINVAL;
	256	}
	257
	258	return 0;
	259	}
	260
	261	static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
	262	{
	263	struct snd_pcm_runtime *runtime = substream->runtime;
	264	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	265
	266	return bytes_to_frames(substream->runtime, iprtd->offset);
	267	}
	268
	269	static struct snd_pcm_hardware snd_imx_hardware = {
	270	.info = SNDRV_PCM_INFO_INTERLEAVED \|
	271	SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	272	SNDRV_PCM_INFO_MMAP \|
	273	SNDRV_PCM_INFO_MMAP_VALID \|
	274	SNDRV_PCM_INFO_PAUSE \|
	275	SNDRV_PCM_INFO_RESUME,
	276	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	277	.rate_min = 8000,
	278	.channels_min = 2,
	279	.channels_max = 2,
	280	.buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
	281	.period_bytes_min = 128,
282	.period_bytes_max = 16 * 1024,
283	.periods_min = 2,
284	.periods_max = 255,
285	.fifo_size = 0,
286	};
287
288	static int snd_imx_open(struct snd_pcm_substream *substream)
289	{
290	struct snd_pcm_runtime *runtime = substream->runtime;
291	struct imx_pcm_runtime_data *iprtd;
292	int ret;
293
294	iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
295	runtime->private_data = iprtd;
296
297	ret = snd_pcm_hw_constraint_integer(substream->runtime,
298	SNDRV_PCM_HW_PARAM_PERIODS);
299	if (ret < 0)
300	return ret;
301
302	snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
303	return 0;
304	}
305
306	static struct snd_pcm_ops imx_pcm_ops = {
307	.open = snd_imx_open,
308	.ioctl = snd_pcm_lib_ioctl,
309	.hw_params = snd_imx_pcm_hw_params,
310	.hw_free = snd_imx_pcm_hw_free,
311	.prepare = snd_imx_pcm_prepare,
312	.trigger = snd_imx_pcm_trigger,
313	.pointer = snd_imx_pcm_pointer,
314	.mmap = snd_imx_pcm_mmap,
315	};
316
317	static struct snd_soc_platform imx_soc_platform_dma = {
318	.name = "imx-audio",
319	.pcm_ops = &imx_pcm_ops,
320	.pcm_new = imx_pcm_new,
321	.pcm_free = imx_pcm_free,
322	};
323
324	struct snd_soc_platform imx_ssi_dma_mx2_init(struct platform_device pdev,
325	struct imx_ssi *ssi)
326	{
327	ssi->dma_params_tx.burstsize = DMA_TXFIFO_BURST;
328	ssi->dma_params_rx.burstsize = DMA_RXFIFO_BURST;
329
330	return &imx_soc_platform_dma;
331	}
332