[deliverable/linux.git] / sound / soc / blackfin / bf5xx-i2s-pcm.c

/*
 * File:         sound/soc/blackfin/bf5xx-i2s-pcm.c
 * Author:       Cliff Cai <Cliff.Cai@analog.com>
 *
 * Created:      Tue June 06 2008
 * Description:  DMA driver for i2s codec
 *
 * Modified:
 *               Copyright 2008 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-sport.h"
#include "bf5xx-i2s-pcm.h"

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_MMAP_VALID |
				   SNDRV_PCM_INFO_BLOCK_TRANSFER,
	.period_bytes_min	= 32,
	.period_bytes_max	= 0x10000,
	.periods_min		= 1,
	.periods_max		= PAGE_SIZE/32,
	.buffer_bytes_max	= 0x20000, /* 128 kbytes */
	.fifo_size		= 16,
};

static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	unsigned int buffer_size = params_buffer_bytes(params);
	struct bf5xx_i2s_pcm_data *dma_data;

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

	if (dma_data->tdm_mode)
		buffer_size = buffer_size / params_channels(params) * 8;

	return snd_pcm_lib_malloc_pages(substream, buffer_size);
}

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_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct sport_device *sport = runtime->private_data;
	int period_bytes = frames_to_bytes(runtime, runtime->period_size);
	struct bf5xx_i2s_pcm_data *dma_data;

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

	if (dma_data->tdm_mode)
		period_bytes = period_bytes / runtime->channels * 8;

	pr_debug("%s enter\n", __func__);
	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, period_bytes);
	} else {
		sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
		sport_config_rx_dma(sport, runtime->dma_area,
			runtime->periods, period_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;

	pr_debug("%s enter\n", __func__);
	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_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct sport_device *sport = runtime->private_data;
	unsigned int diff;
	snd_pcm_uframes_t frames;
	struct bf5xx_i2s_pcm_data *dma_data;

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

	pr_debug("%s enter\n", __func__);
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		diff = sport_curr_offset_tx(sport);
	} else {
		diff = sport_curr_offset_rx(sport);
	}

	/*
	 * TX at least can report one frame beyond the end of the
	 * buffer if we hit the wraparound case - clamp to within the
	 * buffer as the ALSA APIs require.
	 */
	if (diff == snd_pcm_lib_buffer_bytes(substream))
		diff = 0;

	frames = bytes_to_frames(substream->runtime, diff);
	if (dma_data->tdm_mode)
		frames = frames * runtime->channels / 8;

	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;
	struct bf5xx_i2s_pcm_data *dma_data;
	int ret;

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

	pr_debug("%s enter\n", __func__);

	snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
	if (dma_data->tdm_mode)
		runtime->hw.buffer_bytes_max /= 4;
	else
		runtime->hw.info |= SNDRV_PCM_INFO_MMAP;

	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");
		return -1;
	}
	return 0;

 out:
	return ret;
}

static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
	struct vm_area_struct *vma)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	size_t size = vma->vm_end - vma->vm_start;
	vma->vm_start = (unsigned long)runtime->dma_area;
	vma->vm_end = vma->vm_start + size;
	vma->vm_flags |=  VM_SHARED;

	return 0 ;
}

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_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	unsigned int sample_size = runtime->sample_bits / 8;
	struct bf5xx_i2s_pcm_data *dma_data;
	unsigned int i;
	void *src, *dst;

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

	if (dma_data->tdm_mode) {
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
			src = buf;
			dst = runtime->dma_area;
			dst += pos * sample_size * 8;

			while (count--) {
				for (i = 0; i < runtime->channels; i++) {
					memcpy(dst + dma_data->map[i] *
						sample_size, src, sample_size);
					src += sample_size;
				}
				dst += 8 * sample_size;
			}
		} else {
			src = runtime->dma_area;
			src += pos * sample_size * 8;
			dst = buf;

			while (count--) {
				for (i = 0; i < runtime->channels; i++) {
					memcpy(dst, src + dma_data->map[i] *
						sample_size, sample_size);
					dst += sample_size;
				}
				src += 8 * sample_size;
			}
		}
	} else {
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
			src = buf;
			dst = runtime->dma_area;
			dst += frames_to_bytes(runtime, pos);
		} else {
			src = runtime->dma_area;
			src += frames_to_bytes(runtime, pos);
			dst = buf;
		}

		memcpy(dst, src, frames_to_bytes(runtime, count));
	}

	return 0;
}

static int bf5xx_pcm_silence(struct snd_pcm_substream *substream,
	int channel, snd_pcm_uframes_t pos, snd_pcm_uframes_t count)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	unsigned int sample_size = runtime->sample_bits / 8;
	void *buf = runtime->dma_area;
	struct bf5xx_i2s_pcm_data *dma_data;
	unsigned int offset, samples;

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

	if (dma_data->tdm_mode) {
		offset = pos * 8 * sample_size;
		samples = count * 8;
	} else {
		offset = frames_to_bytes(runtime, pos);
		samples = count * runtime->channels;
	}

	snd_pcm_format_set_silence(runtime->format, buf + offset, samples);

	return 0;
}

static struct snd_pcm_ops bf5xx_pcm_i2s_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,
	.mmap		= bf5xx_pcm_mmap,
	.copy		= bf5xx_pcm_copy,
	.silence	= bf5xx_pcm_silence,
};

static int bf5xx_pcm_i2s_new(struct snd_soc_pcm_runtime *rtd)
{
	struct snd_card *card = rtd->card->snd_card;
	size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
	int ret;

	pr_debug("%s enter\n", __func__);
	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
	if (ret)
		return ret;

	return snd_pcm_lib_preallocate_pages_for_all(rtd->pcm,
				SNDRV_DMA_TYPE_DEV, card->dev, size, size);
}

static struct snd_soc_platform_driver bf5xx_i2s_soc_platform = {
	.ops		= &bf5xx_pcm_i2s_ops,
	.pcm_new	= bf5xx_pcm_i2s_new,
};

static int bfin_i2s_soc_platform_probe(struct platform_device *pdev)
{
	return devm_snd_soc_register_platform(&pdev->dev,
					      &bf5xx_i2s_soc_platform);
}

static struct platform_driver bfin_i2s_pcm_driver = {
	.driver = {
		.name = "bfin-i2s-pcm-audio",
	},

	.probe = bfin_i2s_soc_platform_probe,
};

module_platform_driver(bfin_i2s_pcm_driver);

MODULE_AUTHOR("Cliff Cai");
MODULE_DESCRIPTION("ADI Blackfin I2S PCM DMA module");
MODULE_LICENSE("GPL");
Commit	Line	Data
88740da1 CC	1	/*
	2	* File: sound/soc/blackfin/bf5xx-i2s-pcm.c
	3	* Author: Cliff Cai <Cliff.Cai@analog.com>
	4	*
	5	* Created: Tue June 06 2008
	6	* Description: DMA driver for i2s codec
	7	*
	8	* Modified:
	9	* Copyright 2008 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>
88740da1	32	#include <linux/dma-mapping.h>
5a0e3ad6	33	#include <linux/gfp.h>
88740da1 CC	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
88740da1	42	#include "bf5xx-sport.h"
8b5e2e39	43	#include "bf5xx-i2s-pcm.h"
88740da1 CC	44
	45	static void bf5xx_dma_irq(void *data)
	46	{
	47	struct snd_pcm_substream *pcm = data;
	48	snd_pcm_period_elapsed(pcm);
	49	}
	50
	51	static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
	52	.info = SNDRV_PCM_INFO_INTERLEAVED \|
88740da1 CC	53	SNDRV_PCM_INFO_MMAP_VALID \|
88740da1 CC	54	SNDRV_PCM_INFO_BLOCK_TRANSFER,
88740da1 CC	55	.period_bytes_min = 32,
	56	.period_bytes_max = 0x10000,
	57	.periods_min = 1,
	58	.periods_max = PAGE_SIZE/32,
	59	.buffer_bytes_max = 0x20000, /* 128 kbytes */
	60	.fifo_size = 16,
	61	};
	62
	63	static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
	64	struct snd_pcm_hw_params *params)
	65	{
8b5e2e39 LPC	66	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	67	unsigned int buffer_size = params_buffer_bytes(params);
	68	struct bf5xx_i2s_pcm_data *dma_data;
	69
	70	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	71
	72	if (dma_data->tdm_mode)
	73	buffer_size = buffer_size / params_channels(params) * 8;
	74
	75	return snd_pcm_lib_malloc_pages(substream, buffer_size);
88740da1 CC	76	}
	77
	78	static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
	79	{
	80	snd_pcm_lib_free_pages(substream);
	81
	82	return 0;
	83	}
	84
	85	static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
	86	{
8b5e2e39	87	struct snd_soc_pcm_runtime *rtd = substream->private_data;
88740da1 CC	88	struct snd_pcm_runtime *runtime = substream->runtime;
	89	struct sport_device *sport = runtime->private_data;
	90	int period_bytes = frames_to_bytes(runtime, runtime->period_size);
8b5e2e39 LPC	91	struct bf5xx_i2s_pcm_data *dma_data;
	92
	93	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	94
	95	if (dma_data->tdm_mode)
	96	period_bytes = period_bytes / runtime->channels * 8;
88740da1 CC	97
	98	pr_debug("%s enter\n", __func__);
	99	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	100	sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
	101	sport_config_tx_dma(sport, runtime->dma_area,
	102	runtime->periods, period_bytes);
	103	} else {
	104	sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
	105	sport_config_rx_dma(sport, runtime->dma_area,
	106	runtime->periods, period_bytes);
	107	}
	108
	109	return 0;
	110	}
	111
	112	static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	113	{
	114	struct snd_pcm_runtime *runtime = substream->runtime;
	115	struct sport_device *sport = runtime->private_data;
	116	int ret = 0;
	117
	118	pr_debug("%s enter\n", __func__);
	119	switch (cmd) {
	120	case SNDRV_PCM_TRIGGER_START:
	121	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	122	sport_tx_start(sport);
	123	else
	124	sport_rx_start(sport);
	125	break;
	126	case SNDRV_PCM_TRIGGER_STOP:
	127	case SNDRV_PCM_TRIGGER_SUSPEND:
	128	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	129	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	130	sport_tx_stop(sport);
	131	else
	132	sport_rx_stop(sport);
	133	break;
	134	default:
	135	ret = -EINVAL;
	136	}
	137
	138	return ret;
	139	}
	140
	141	static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
	142	{
8b5e2e39	143	struct snd_soc_pcm_runtime *rtd = substream->private_data;
88740da1 CC	144	struct snd_pcm_runtime *runtime = substream->runtime;
	145	struct sport_device *sport = runtime->private_data;
	146	unsigned int diff;
	147	snd_pcm_uframes_t frames;
8b5e2e39 LPC	148	struct bf5xx_i2s_pcm_data *dma_data;
	149
	150	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	151
88740da1 CC	152	pr_debug("%s enter\n", __func__);
	153	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	154	diff = sport_curr_offset_tx(sport);
88740da1 CC	155	} else {
88740da1 CC	156	diff = sport_curr_offset_rx(sport);
88740da1	157	}
e999dc50 MB	158
	159	/*
	160	* TX at least can report one frame beyond the end of the
	161	* buffer if we hit the wraparound case - clamp to within the
	162	* buffer as the ALSA APIs require.
	163	*/
	164	if (diff == snd_pcm_lib_buffer_bytes(substream))
	165	diff = 0;
	166
	167	frames = bytes_to_frames(substream->runtime, diff);
8b5e2e39 LPC	168	if (dma_data->tdm_mode)
8b5e2e39 LPC	169	frames = frames * runtime->channels / 8;
e999dc50	170
88740da1 CC	171	return frames;
	172	}
	173
	174	static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
	175	{
2c66cb99 BS	176	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	177	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	178	struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
88740da1	179	struct snd_pcm_runtime *runtime = substream->runtime;
2c66cb99	180	struct snd_dma_buffer *buf = &substream->dma_buffer;
8b5e2e39	181	struct bf5xx_i2s_pcm_data *dma_data;
88740da1 CC	182	int ret;
88740da1 CC	183
8b5e2e39 LPC	184	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
8b5e2e39 LPC	185
88740da1	186	pr_debug("%s enter\n", __func__);
2c66cb99	187
88740da1	188	snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
8b5e2e39 LPC	189	if (dma_data->tdm_mode)
	190	runtime->hw.buffer_bytes_max /= 4;
	191	else
	192	runtime->hw.info \|= SNDRV_PCM_INFO_MMAP;
88740da1	193
b83e60c0	194	ret = snd_pcm_hw_constraint_integer(runtime,
88740da1 CC	195	SNDRV_PCM_HW_PARAM_PERIODS);
	196	if (ret < 0)
	197	goto out;
	198
2c66cb99 BS	199	if (sport_handle != NULL) {
	200	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	201	sport_handle->tx_buf = buf->area;
	202	else
	203	sport_handle->rx_buf = buf->area;
	204
88740da1	205	runtime->private_data = sport_handle;
2c66cb99	206	} else {
88740da1 CC	207	pr_err("sport_handle is NULL\n");
	208	return -1;
	209	}
	210	return 0;
	211
	212	out:
	213	return ret;
	214	}
	215
	216	static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
	217	struct vm_area_struct *vma)
	218	{
	219	struct snd_pcm_runtime *runtime = substream->runtime;
	220	size_t size = vma->vm_end - vma->vm_start;
	221	vma->vm_start = (unsigned long)runtime->dma_area;
	222	vma->vm_end = vma->vm_start + size;
	223	vma->vm_flags \|= VM_SHARED;
	224
	225	return 0 ;
	226	}
	227
8b5e2e39 LPC	228	static int bf5xx_pcm_copy(struct snd_pcm_substream *substream, int channel,
	229	snd_pcm_uframes_t pos, void *buf, snd_pcm_uframes_t count)
	230	{
	231	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	232	struct snd_pcm_runtime *runtime = substream->runtime;
	233	unsigned int sample_size = runtime->sample_bits / 8;
	234	struct bf5xx_i2s_pcm_data *dma_data;
	235	unsigned int i;
	236	void src, dst;
	237
	238	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	239
	240	if (dma_data->tdm_mode) {
	241	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	242	src = buf;
	243	dst = runtime->dma_area;
	244	dst += pos * sample_size * 8;
	245
	246	while (count--) {
	247	for (i = 0; i < runtime->channels; i++) {
	248	memcpy(dst + dma_data->map[i] *
	249	sample_size, src, sample_size);
	250	src += sample_size;
	251	}
	252	dst += 8 * sample_size;
	253	}
	254	} else {
	255	src = runtime->dma_area;
	256	src += pos * sample_size * 8;
	257	dst = buf;
	258
	259	while (count--) {
	260	for (i = 0; i < runtime->channels; i++) {
	261	memcpy(dst, src + dma_data->map[i] *
	262	sample_size, sample_size);
	263	dst += sample_size;
	264	}
	265	src += 8 * sample_size;
	266	}
	267	}
	268	} else {
	269	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	270	src = buf;
	271	dst = runtime->dma_area;
	272	dst += frames_to_bytes(runtime, pos);
	273	} else {
	274	src = runtime->dma_area;
	275	src += frames_to_bytes(runtime, pos);
	276	dst = buf;
	277	}
	278
	279	memcpy(dst, src, frames_to_bytes(runtime, count));
	280	}
	281
	282	return 0;
	283	}
	284
	285	static int bf5xx_pcm_silence(struct snd_pcm_substream *substream,
	286	int channel, snd_pcm_uframes_t pos, snd_pcm_uframes_t count)
	287	{
	288	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	289	struct snd_pcm_runtime *runtime = substream->runtime;
	290	unsigned int sample_size = runtime->sample_bits / 8;
	291	void *buf = runtime->dma_area;
292	struct bf5xx_i2s_pcm_data *dma_data;
30443408	293	unsigned int offset, samples;
8b5e2e39 LPC	294
	295	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	296
	297	if (dma_data->tdm_mode) {
	298	offset = pos * 8 * sample_size;
30443408	299	samples = count * 8;
8b5e2e39 LPC	300	} else {
8b5e2e39 LPC	301	offset = frames_to_bytes(runtime, pos);
30443408	302	samples = count * runtime->channels;
8b5e2e39 LPC	303	}
8b5e2e39 LPC	304
30443408	305	snd_pcm_format_set_silence(runtime->format, buf + offset, samples);
8b5e2e39 LPC	306
	307	return 0;
	308	}
	309
b2a19d02	310	static struct snd_pcm_ops bf5xx_pcm_i2s_ops = {
88740da1 CC	311	.open = bf5xx_pcm_open,
	312	.ioctl = snd_pcm_lib_ioctl,
	313	.hw_params = bf5xx_pcm_hw_params,
	314	.hw_free = bf5xx_pcm_hw_free,
	315	.prepare = bf5xx_pcm_prepare,
	316	.trigger = bf5xx_pcm_trigger,
	317	.pointer = bf5xx_pcm_pointer,
	318	.mmap = bf5xx_pcm_mmap,
8b5e2e39 LPC	319	.copy = bf5xx_pcm_copy,
8b5e2e39 LPC	320	.silence = bf5xx_pcm_silence,
88740da1 CC	321	};
88740da1 CC	322
3b70e3b5	323	static int bf5xx_pcm_i2s_new(struct snd_soc_pcm_runtime *rtd)
88740da1	324	{
552d1ef6	325	struct snd_card *card = rtd->card->snd_card;
a3935a29	326	size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
c9bd5e69	327	int ret;
88740da1 CC	328
88740da1 CC	329	pr_debug("%s enter\n", __func__);
c9bd5e69 RK	330	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
	331	if (ret)
	332	return ret;
88740da1	333
a3935a29 LPC	334	return snd_pcm_lib_preallocate_pages_for_all(rtd->pcm,
a3935a29 LPC	335	SNDRV_DMA_TYPE_DEV, card->dev, size, size);
88740da1 CC	336	}
88740da1 CC	337
f0fba2ad LG	338	static struct snd_soc_platform_driver bf5xx_i2s_soc_platform = {
f0fba2ad LG	339	.ops = &bf5xx_pcm_i2s_ops,
88740da1	340	.pcm_new = bf5xx_pcm_i2s_new,
88740da1	341	};
88740da1	342
dca66dab	343	static int bfin_i2s_soc_platform_probe(struct platform_device *pdev)
958e792c	344	{
c4d2ab0d AL	345	return devm_snd_soc_register_platform(&pdev->dev,
c4d2ab0d AL	346	&bf5xx_i2s_soc_platform);
f0fba2ad LG	347	}
	348
	349	static struct platform_driver bfin_i2s_pcm_driver = {
	350	.driver = {
b83e60c0	351	.name = "bfin-i2s-pcm-audio",
f0fba2ad LG	352	},
	353
	354	.probe = bfin_i2s_soc_platform_probe,
f0fba2ad LG	355	};
f0fba2ad LG	356
fb80297e	357	module_platform_driver(bfin_i2s_pcm_driver);
958e792c	358
88740da1 CC	359	MODULE_AUTHOR("Cliff Cai");
	360	MODULE_DESCRIPTION("ADI Blackfin I2S PCM DMA module");
	361	MODULE_LICENSE("GPL");