[GitHub/mt8127/android_kernel_alcatel_ttab.git] / sound / soc / blackfin / bf5xx-tdm-pcm.c

/*
 * File:         sound/soc/blackfin/bf5xx-tdm-pcm.c
 * Author:       Barry Song <Barry.Song@analog.com>
 *
 * Created:      Tue June 06 2009
 * Description:  DMA driver for tdm codec
 *
 * Modified:
 *               Copyright 2009 Analog Devices Inc.
 *
 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 *
 * 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, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/gfp.h>

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

#include <asm/dma.h>

#include "bf5xx-tdm-pcm.h"
#include "bf5xx-tdm.h"
#include "bf5xx-sport.h"

#define PCM_BUFFER_MAX  0x8000
#define FRAGMENT_SIZE_MIN  (4*1024)
#define FRAGMENTS_MIN  2
#define FRAGMENTS_MAX  32

static void bf5xx_dma_irq(void *data)
{
	struct snd_pcm_substream *pcm = data;
	snd_pcm_period_elapsed(pcm);
}

static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
	.info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
		SNDRV_PCM_INFO_RESUME),
	.formats =          SNDRV_PCM_FMTBIT_S32_LE,
	.rates =            SNDRV_PCM_RATE_48000,
	.channels_min =     2,
	.channels_max =     8,
	.buffer_bytes_max = PCM_BUFFER_MAX,
	.period_bytes_min = FRAGMENT_SIZE_MIN,
	.period_bytes_max = PCM_BUFFER_MAX/2,
	.periods_min =      FRAGMENTS_MIN,
	.periods_max =      FRAGMENTS_MAX,
};

static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
{
	size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
	snd_pcm_lib_malloc_pages(substream, size * 4);

	return 0;
}

static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
{
	snd_pcm_lib_free_pages(substream);

	return 0;
}

static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct sport_device *sport = runtime->private_data;
	int fragsize_bytes = frames_to_bytes(runtime, runtime->period_size);

	fragsize_bytes /= runtime->channels;
	/* inflate the fragsize to match the dma width of SPORT */
	fragsize_bytes *= 8;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
		sport_config_tx_dma(sport, runtime->dma_area,
			runtime->periods, fragsize_bytes);
	} else {
		sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
		sport_config_rx_dma(sport, runtime->dma_area,
			runtime->periods, fragsize_bytes);
	}

	return 0;
}

static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct sport_device *sport = runtime->private_data;
	int ret = 0;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
			sport_tx_start(sport);
		else
			sport_rx_start(sport);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
			sport_tx_stop(sport);
		else
			sport_rx_stop(sport);
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct sport_device *sport = runtime->private_data;
	unsigned int diff;
	snd_pcm_uframes_t frames;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		diff = sport_curr_offset_tx(sport);
		frames = diff / (8*4); /* 32 bytes per frame */
	} else {
		diff = sport_curr_offset_rx(sport);
		frames = diff / (8*4);
	}
	return frames;
}

static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_dma_buffer *buf = &substream->dma_buffer;

	int ret = 0;

	snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);

	ret = snd_pcm_hw_constraint_integer(runtime,
		SNDRV_PCM_HW_PARAM_PERIODS);
	if (ret < 0)
		goto out;

	if (sport_handle != NULL) {
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
			sport_handle->tx_buf = buf->area;
		else
			sport_handle->rx_buf = buf->area;

		runtime->private_data = sport_handle;
	} else {
		pr_err("sport_handle is NULL\n");
		ret = -ENODEV;
	}
out:
	return ret;
}

static int bf5xx_pcm_copy(struct snd_pcm_substream *substream, int channel,
	snd_pcm_uframes_t pos, void *buf, snd_pcm_uframes_t count)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct sport_device *sport = runtime->private_data;
	struct bf5xx_tdm_port *tdm_port = sport->private_data;
	unsigned int *src;
	unsigned int *dst;
	int i;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		src = buf;
		dst = (unsigned int *)substream->runtime->dma_area;

		dst += pos * 8;
		while (count--) {
			for (i = 0; i < substream->runtime->channels; i++)
				*(dst + tdm_port->tx_map[i]) = *src++;
			dst += 8;
		}
	} else {
		src = (unsigned int *)substream->runtime->dma_area;
		dst = buf;

		src += pos * 8;
		while (count--) {
			for (i = 0; i < substream->runtime->channels; i++)
				*dst++ = *(src + tdm_port->rx_map[i]);
			src += 8;
		}
	}

	return 0;
}

static int bf5xx_pcm_silence(struct snd_pcm_substream *substream,
	int channel, snd_pcm_uframes_t pos, snd_pcm_uframes_t count)
{
	unsigned char *buf = substream->runtime->dma_area;
	buf += pos * 8 * 4;
	memset(buf, '\0', count * 8 * 4);

	return 0;
}


struct snd_pcm_ops bf5xx_pcm_tdm_ops = {
	.open           = bf5xx_pcm_open,
	.ioctl          = snd_pcm_lib_ioctl,
	.hw_params      = bf5xx_pcm_hw_params,
	.hw_free        = bf5xx_pcm_hw_free,
	.prepare        = bf5xx_pcm_prepare,
	.trigger        = bf5xx_pcm_trigger,
	.pointer        = bf5xx_pcm_pointer,
	.copy           = bf5xx_pcm_copy,
	.silence        = bf5xx_pcm_silence,
};

static int bf5xx_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 = bf5xx_pcm_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_coherent(pcm->card->dev, size * 4,
		&buf->addr, GFP_KERNEL);
	if (!buf->area) {
		pr_err("Failed to allocate dma memory - Please increase uncached DMA memory region\n");
		return -ENOMEM;
	}
	buf->bytes = size;

	return 0;
}

static void bf5xx_pcm_free_dma_buffers(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_coherent(NULL, buf->bytes, buf->area, 0);
		buf->area = NULL;
	}
}

static u64 bf5xx_pcm_dmamask = DMA_BIT_MASK(32);

static int bf5xx_pcm_tdm_new(struct snd_card *card, struct snd_soc_dai *dai,
	struct snd_pcm *pcm)
{
	int ret = 0;

	if (!card->dev->dma_mask)
		card->dev->dma_mask = &bf5xx_pcm_dmamask;
	if (!card->dev->coherent_dma_mask)
		card->dev->coherent_dma_mask = DMA_BIT_MASK(32);

	if (dai->driver->playback.channels_min) {
		ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
			SNDRV_PCM_STREAM_PLAYBACK);
		if (ret)
			goto out;
	}

	if (dai->driver->capture.channels_min) {
		ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
			SNDRV_PCM_STREAM_CAPTURE);
		if (ret)
			goto out;
	}
out:
	return ret;
}

static struct snd_soc_platform_driver bf5xx_tdm_soc_platform = {
	.ops        = &bf5xx_pcm_tdm_ops,
	.pcm_new        = bf5xx_pcm_tdm_new,
	.pcm_free       = bf5xx_pcm_free_dma_buffers,
};

static int __devinit bf5xx_soc_platform_probe(struct platform_device *pdev)
{
	return snd_soc_register_platform(&pdev->dev, &bf5xx_tdm_soc_platform);
}

static int __devexit bf5xx_soc_platform_remove(struct platform_device *pdev)
{
	snd_soc_unregister_platform(&pdev->dev);
	return 0;
}

static struct platform_driver bfin_tdm_driver = {
	.driver = {
			.name = "bfin-tdm-pcm-audio",
			.owner = THIS_MODULE,
	},

	.probe = bf5xx_soc_platform_probe,
	.remove = __devexit_p(bf5xx_soc_platform_remove),
};

static int __init snd_bfin_tdm_init(void)
{
	return platform_driver_register(&bfin_tdm_driver);
}
module_init(snd_bfin_tdm_init);

static void __exit snd_bfin_tdm_exit(void)
{
	platform_driver_unregister(&bfin_tdm_driver);
}
module_exit(snd_bfin_tdm_exit);

MODULE_AUTHOR("Barry Song");
MODULE_DESCRIPTION("ADI Blackfin TDM PCM DMA module");
MODULE_LICENSE("GPL");
Commit	Line	Data
01e2ab20 BS	1	/*
	2	* File: sound/soc/blackfin/bf5xx-tdm-pcm.c
	3	* Author: Barry Song <Barry.Song@analog.com>
	4	*
	5	* Created: Tue June 06 2009
	6	* Description: DMA driver for tdm codec
	7	*
	8	* Modified:
	9	* Copyright 2009 Analog Devices Inc.
	10	*
	11	* Bugs: Enter bugs at http://blackfin.uclinux.org/
	12	*
	13	* This program is free software; you can redistribute it and/or modify
	14	* it under the terms of the GNU General Public License as published by
	15	* the Free Software Foundation; either version 2 of the License, or
	16	* (at your option) any later version.
	17	*
	18	* This program is distributed in the hope that it will be useful,
	19	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	20	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	21	* GNU General Public License for more details.
	22	*
	23	* You should have received a copy of the GNU General Public License
	24	* along with this program; if not, see the file COPYING, or write
	25	* to the Free Software Foundation, Inc.,
	26	* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	27	*/
	28
	29	#include <linux/module.h>
	30	#include <linux/init.h>
	31	#include <linux/platform_device.h>
01e2ab20	32	#include <linux/dma-mapping.h>
5a0e3ad6	33	#include <linux/gfp.h>
01e2ab20 BS	34
	35	#include <sound/core.h>
	36	#include <sound/pcm.h>
	37	#include <sound/pcm_params.h>
	38	#include <sound/soc.h>
	39
	40	#include <asm/dma.h>
	41
	42	#include "bf5xx-tdm-pcm.h"
	43	#include "bf5xx-tdm.h"
	44	#include "bf5xx-sport.h"
	45
08db48f1	46	#define PCM_BUFFER_MAX 0x8000
01e2ab20 BS	47	#define FRAGMENT_SIZE_MIN (4*1024)
	48	#define FRAGMENTS_MIN 2
	49	#define FRAGMENTS_MAX 32
	50
	51	static void bf5xx_dma_irq(void *data)
	52	{
	53	struct snd_pcm_substream *pcm = data;
	54	snd_pcm_period_elapsed(pcm);
	55	}
	56
	57	static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
	58	.info = (SNDRV_PCM_INFO_INTERLEAVED \| SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	59	SNDRV_PCM_INFO_RESUME),
	60	.formats = SNDRV_PCM_FMTBIT_S32_LE,
	61	.rates = SNDRV_PCM_RATE_48000,
	62	.channels_min = 2,
	63	.channels_max = 8,
	64	.buffer_bytes_max = PCM_BUFFER_MAX,
	65	.period_bytes_min = FRAGMENT_SIZE_MIN,
	66	.period_bytes_max = PCM_BUFFER_MAX/2,
	67	.periods_min = FRAGMENTS_MIN,
	68	.periods_max = FRAGMENTS_MAX,
	69	};
	70
	71	static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
	72	struct snd_pcm_hw_params *params)
	73	{
	74	size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
	75	snd_pcm_lib_malloc_pages(substream, size * 4);
	76
	77	return 0;
	78	}
	79
	80	static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
	81	{
	82	snd_pcm_lib_free_pages(substream);
	83
	84	return 0;
	85	}
	86
	87	static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
	88	{
	89	struct snd_pcm_runtime *runtime = substream->runtime;
	90	struct sport_device *sport = runtime->private_data;
	91	int fragsize_bytes = frames_to_bytes(runtime, runtime->period_size);
	92
	93	fragsize_bytes /= runtime->channels;
	94	/* inflate the fragsize to match the dma width of SPORT */
	95	fragsize_bytes *= 8;
	96
	97	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	98	sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
	99	sport_config_tx_dma(sport, runtime->dma_area,
	100	runtime->periods, fragsize_bytes);
	101	} else {
	102	sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
	103	sport_config_rx_dma(sport, runtime->dma_area,
	104	runtime->periods, fragsize_bytes);
	105	}
	106
	107	return 0;
	108	}
	109
	110	static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
111	{
112	struct snd_pcm_runtime *runtime = substream->runtime;
113	struct sport_device *sport = runtime->private_data;
114	int ret = 0;
115
116	switch (cmd) {
117	case SNDRV_PCM_TRIGGER_START:
118	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
119	sport_tx_start(sport);
120	else
121	sport_rx_start(sport);
122	break;
123	case SNDRV_PCM_TRIGGER_STOP:
124	case SNDRV_PCM_TRIGGER_SUSPEND:
125	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
126	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
127	sport_tx_stop(sport);
128	else
129	sport_rx_stop(sport);
130	break;
131	default:
132	ret = -EINVAL;
133	}
134
135	return ret;
136	}
137
138	static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
139	{
140	struct snd_pcm_runtime *runtime = substream->runtime;
141	struct sport_device *sport = runtime->private_data;
142	unsigned int diff;
143	snd_pcm_uframes_t frames;
144
145	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
146	diff = sport_curr_offset_tx(sport);
147	frames = diff / (84); / 32 bytes per frame */
148	} else {
149	diff = sport_curr_offset_rx(sport);
150	frames = diff / (8*4);
151	}
152	return frames;
153	}
154
155	static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
156	{
2c66cb99 BS	157	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	158	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	159	struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
01e2ab20	160	struct snd_pcm_runtime *runtime = substream->runtime;
2c66cb99 BS	161	struct snd_dma_buffer *buf = &substream->dma_buffer;
2c66cb99 BS	162
01e2ab20 BS	163	int ret = 0;
	164
	165	snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
	166
	167	ret = snd_pcm_hw_constraint_integer(runtime,
	168	SNDRV_PCM_HW_PARAM_PERIODS);
	169	if (ret < 0)
	170	goto out;
	171
2c66cb99 BS	172	if (sport_handle != NULL) {
	173	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	174	sport_handle->tx_buf = buf->area;
	175	else
	176	sport_handle->rx_buf = buf->area;
	177
01e2ab20	178	runtime->private_data = sport_handle;
2c66cb99	179	} else {
01e2ab20 BS	180	pr_err("sport_handle is NULL\n");
	181	ret = -ENODEV;
	182	}
	183	out:
	184	return ret;
	185	}
	186
	187	static int bf5xx_pcm_copy(struct snd_pcm_substream *substream, int channel,
	188	snd_pcm_uframes_t pos, void *buf, snd_pcm_uframes_t count)
	189	{
08db48f1 BS	190	struct snd_pcm_runtime *runtime = substream->runtime;
	191	struct sport_device *sport = runtime->private_data;
	192	struct bf5xx_tdm_port *tdm_port = sport->private_data;
01e2ab20 BS	193	unsigned int *src;
	194	unsigned int *dst;
	195	int i;
	196
	197	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	198	src = buf;
	199	dst = (unsigned int *)substream->runtime->dma_area;
	200
	201	dst += pos * 8;
	202	while (count--) {
	203	for (i = 0; i < substream->runtime->channels; i++)
08db48f1	204	(dst + tdm_port->tx_map[i]) = src++;
01e2ab20 BS	205	dst += 8;
	206	}
	207	} else {
	208	src = (unsigned int *)substream->runtime->dma_area;
	209	dst = buf;
	210
	211	src += pos * 8;
	212	while (count--) {
	213	for (i = 0; i < substream->runtime->channels; i++)
08db48f1	214	dst++ = (src + tdm_port->rx_map[i]);
01e2ab20 BS	215	src += 8;
	216	}
	217	}
	218
	219	return 0;
	220	}
	221
	222	static int bf5xx_pcm_silence(struct snd_pcm_substream *substream,
	223	int channel, snd_pcm_uframes_t pos, snd_pcm_uframes_t count)
	224	{
	225	unsigned char *buf = substream->runtime->dma_area;
	226	buf += pos * 8 * 4;
	227	memset(buf, '\0', count * 8 * 4);
	228
	229	return 0;
	230	}
	231
	232
	233	struct snd_pcm_ops bf5xx_pcm_tdm_ops = {
	234	.open = bf5xx_pcm_open,
	235	.ioctl = snd_pcm_lib_ioctl,
	236	.hw_params = bf5xx_pcm_hw_params,
	237	.hw_free = bf5xx_pcm_hw_free,
	238	.prepare = bf5xx_pcm_prepare,
	239	.trigger = bf5xx_pcm_trigger,
	240	.pointer = bf5xx_pcm_pointer,
	241	.copy = bf5xx_pcm_copy,
	242	.silence = bf5xx_pcm_silence,
	243	};
	244
	245	static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
	246	{
	247	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	248	struct snd_dma_buffer *buf = &substream->dma_buffer;
	249	size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
	250
	251	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	252	buf->dev.dev = pcm->card->dev;
	253	buf->private_data = NULL;
	254	buf->area = dma_alloc_coherent(pcm->card->dev, size * 4,
	255	&buf->addr, GFP_KERNEL);
	256	if (!buf->area) {
2f1ff661	257	pr_err("Failed to allocate dma memory - Please increase uncached DMA memory region\n");
01e2ab20 BS	258	return -ENOMEM;
	259	}
	260	buf->bytes = size;
	261
01e2ab20 BS	262	return 0;
	263	}
	264
	265	static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
	266	{
	267	struct snd_pcm_substream *substream;
	268	struct snd_dma_buffer *buf;
	269	int stream;
	270
	271	for (stream = 0; stream < 2; stream++) {
	272	substream = pcm->streams[stream].substream;
	273	if (!substream)
	274	continue;
	275
	276	buf = &substream->dma_buffer;
	277	if (!buf->area)
	278	continue;
	279	dma_free_coherent(NULL, buf->bytes, buf->area, 0);
	280	buf->area = NULL;
	281	}
01e2ab20 BS	282	}
01e2ab20 BS	283
3a39f832	284	static u64 bf5xx_pcm_dmamask = DMA_BIT_MASK(32);
01e2ab20 BS	285
	286	static int bf5xx_pcm_tdm_new(struct snd_card card, struct snd_soc_dai dai,
	287	struct snd_pcm *pcm)
	288	{
	289	int ret = 0;
	290
	291	if (!card->dev->dma_mask)
	292	card->dev->dma_mask = &bf5xx_pcm_dmamask;
	293	if (!card->dev->coherent_dma_mask)
3a39f832	294	card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
01e2ab20	295
f0fba2ad	296	if (dai->driver->playback.channels_min) {
01e2ab20 BS	297	ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
	298	SNDRV_PCM_STREAM_PLAYBACK);
	299	if (ret)
	300	goto out;
	301	}
	302
f0fba2ad	303	if (dai->driver->capture.channels_min) {
01e2ab20 BS	304	ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
	305	SNDRV_PCM_STREAM_CAPTURE);
	306	if (ret)
	307	goto out;
	308	}
	309	out:
	310	return ret;
	311	}
	312
f0fba2ad LG	313	static struct snd_soc_platform_driver bf5xx_tdm_soc_platform = {
f0fba2ad LG	314	.ops = &bf5xx_pcm_tdm_ops,
01e2ab20 BS	315	.pcm_new = bf5xx_pcm_tdm_new,
	316	.pcm_free = bf5xx_pcm_free_dma_buffers,
	317	};
01e2ab20	318
f0fba2ad	319	static int __devinit bf5xx_soc_platform_probe(struct platform_device *pdev)
01e2ab20	320	{
f0fba2ad	321	return snd_soc_register_platform(&pdev->dev, &bf5xx_tdm_soc_platform);
01e2ab20	322	}
01e2ab20	323
f0fba2ad	324	static int __devexit bf5xx_soc_platform_remove(struct platform_device *pdev)
01e2ab20	325	{
f0fba2ad LG	326	snd_soc_unregister_platform(&pdev->dev);
	327	return 0;
	328	}
	329
	330	static struct platform_driver bfin_tdm_driver = {
	331	.driver = {
bfe4ee0a	332	.name = "bfin-tdm-pcm-audio",
f0fba2ad LG	333	.owner = THIS_MODULE,
	334	},
	335
	336	.probe = bf5xx_soc_platform_probe,
	337	.remove = __devexit_p(bf5xx_soc_platform_remove),
	338	};
	339
	340	static int __init snd_bfin_tdm_init(void)
	341	{
	342	return platform_driver_register(&bfin_tdm_driver);
	343	}
	344	module_init(snd_bfin_tdm_init);
	345
	346	static void __exit snd_bfin_tdm_exit(void)
	347	{
	348	platform_driver_unregister(&bfin_tdm_driver);
01e2ab20	349	}
f0fba2ad	350	module_exit(snd_bfin_tdm_exit);
01e2ab20 BS	351
	352	MODULE_AUTHOR("Barry Song");
	353	MODULE_DESCRIPTION("ADI Blackfin TDM PCM DMA module");
	354	MODULE_LICENSE("GPL");