[deliverable/linux.git] / sound / soc / omap / omap-pcm.c

/*
 * omap-pcm.c  --  ALSA PCM interface for the OMAP SoC
 *
 * Copyright (C) 2008 Nokia Corporation
 *
 * Contact: Jarkko Nikula <jhnikula@gmail.com>
 *          Peter Ujfalusi <peter.ujfalusi@nokia.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/dma-mapping.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

#include <plat/dma.h>
#include "omap-pcm.h"

static const struct snd_pcm_hardware omap_pcm_hardware = {
	.info			= SNDRV_PCM_INFO_MMAP |
				  SNDRV_PCM_INFO_MMAP_VALID |
				  SNDRV_PCM_INFO_INTERLEAVED |
				  SNDRV_PCM_INFO_PAUSE |
				  SNDRV_PCM_INFO_RESUME,
	.formats		= SNDRV_PCM_FMTBIT_S16_LE |
				  SNDRV_PCM_FMTBIT_S32_LE,
	.period_bytes_min	= 32,
	.period_bytes_max	= 64 * 1024,
	.periods_min		= 2,
	.periods_max		= 255,
	.buffer_bytes_max	= 128 * 1024,
};

struct omap_runtime_data {
	spinlock_t			lock;
	struct omap_pcm_dma_data	*dma_data;
	int				dma_ch;
	int				period_index;
};

static void omap_pcm_dma_irq(int ch, u16 stat, void *data)
{
	struct snd_pcm_substream *substream = data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct omap_runtime_data *prtd = runtime->private_data;
	unsigned long flags;

	if ((cpu_is_omap1510())) {
		/*
		 * OMAP1510 doesn't fully support DMA progress counter
		 * and there is no software emulation implemented yet,
		 * so have to maintain our own progress counters
		 * that can be used by omap_pcm_pointer() instead.
		 */
		spin_lock_irqsave(&prtd->lock, flags);
		if ((stat == OMAP_DMA_LAST_IRQ) &&
				(prtd->period_index == runtime->periods - 1)) {
			/* we are in sync, do nothing */
			spin_unlock_irqrestore(&prtd->lock, flags);
			return;
		}
		if (prtd->period_index >= 0) {
			if (stat & OMAP_DMA_BLOCK_IRQ) {
				/* end of buffer reached, loop back */
				prtd->period_index = 0;
			} else if (stat & OMAP_DMA_LAST_IRQ) {
				/* update the counter for the last period */
				prtd->period_index = runtime->periods - 1;
			} else if (++prtd->period_index >= runtime->periods) {
				/* end of buffer missed? loop back */
				prtd->period_index = 0;
			}
		}
		spin_unlock_irqrestore(&prtd->lock, flags);
	}

	snd_pcm_period_elapsed(substream);
}

/* this may get called several times by oss emulation */
static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
			      struct snd_pcm_hw_params *params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct omap_runtime_data *prtd = runtime->private_data;
	struct omap_pcm_dma_data *dma_data = rtd->dai->cpu_dai->dma_data;
	int err = 0;

	/* return if this is a bufferless transfer e.g.
	 * codec <--> BT codec or GSM modem -- lg FIXME */
	if (!dma_data)
		return 0;

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	runtime->dma_bytes = params_buffer_bytes(params);

	if (prtd->dma_data)
		return 0;
	prtd->dma_data = dma_data;
	err = omap_request_dma(dma_data->dma_req, dma_data->name,
			       omap_pcm_dma_irq, substream, &prtd->dma_ch);
	if (!err) {
		/*
		 * Link channel with itself so DMA doesn't need any
		 * reprogramming while looping the buffer
		 */
		omap_dma_link_lch(prtd->dma_ch, prtd->dma_ch);
	}

	return err;
}

static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct omap_runtime_data *prtd = runtime->private_data;

	if (prtd->dma_data == NULL)
		return 0;

	omap_dma_unlink_lch(prtd->dma_ch, prtd->dma_ch);
	omap_free_dma(prtd->dma_ch);
	prtd->dma_data = NULL;

	snd_pcm_set_runtime_buffer(substream, NULL);

	return 0;
}

static int omap_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct omap_runtime_data *prtd = runtime->private_data;
	struct omap_pcm_dma_data *dma_data = prtd->dma_data;
	struct omap_dma_channel_params dma_params;
	int bytes;

	/* return if this is a bufferless transfer e.g.
	 * codec <--> BT codec or GSM modem -- lg FIXME */
	if (!prtd->dma_data)
		return 0;

	memset(&dma_params, 0, sizeof(dma_params));
	dma_params.data_type			= dma_data->data_type;
	dma_params.trigger			= dma_data->dma_req;
	dma_params.sync_mode			= dma_data->sync_mode;
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		dma_params.src_amode		= OMAP_DMA_AMODE_POST_INC;
		dma_params.dst_amode		= OMAP_DMA_AMODE_CONSTANT;
		dma_params.src_or_dst_synch	= OMAP_DMA_DST_SYNC;
		dma_params.src_start		= runtime->dma_addr;
		dma_params.dst_start		= dma_data->port_addr;
		dma_params.dst_port		= OMAP_DMA_PORT_MPUI;
		dma_params.dst_fi		= dma_data->packet_size;
	} else {
		dma_params.src_amode		= OMAP_DMA_AMODE_CONSTANT;
		dma_params.dst_amode		= OMAP_DMA_AMODE_POST_INC;
		dma_params.src_or_dst_synch	= OMAP_DMA_SRC_SYNC;
		dma_params.src_start		= dma_data->port_addr;
		dma_params.dst_start		= runtime->dma_addr;
		dma_params.src_port		= OMAP_DMA_PORT_MPUI;
		dma_params.src_fi		= dma_data->packet_size;
	}
	/*
	 * Set DMA transfer frame size equal to ALSA period size and frame
	 * count as no. of ALSA periods. Then with DMA frame interrupt enabled,
	 * we can transfer the whole ALSA buffer with single DMA transfer but
	 * still can get an interrupt at each period bounary
	 */
	bytes = snd_pcm_lib_period_bytes(substream);
	dma_params.elem_count	= bytes >> dma_data->data_type;
	dma_params.frame_count	= runtime->periods;
	omap_set_dma_params(prtd->dma_ch, &dma_params);

	if ((cpu_is_omap1510()))
		omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ |
			      OMAP_DMA_LAST_IRQ | OMAP_DMA_BLOCK_IRQ);
	else
		omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ);

	if (!(cpu_class_is_omap1())) {
		omap_set_dma_src_burst_mode(prtd->dma_ch,
						OMAP_DMA_DATA_BURST_16);
		omap_set_dma_dest_burst_mode(prtd->dma_ch,
						OMAP_DMA_DATA_BURST_16);
	}

	return 0;
}

static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct omap_runtime_data *prtd = runtime->private_data;
	struct omap_pcm_dma_data *dma_data = prtd->dma_data;
	unsigned long flags;
	int ret = 0;

	spin_lock_irqsave(&prtd->lock, flags);
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		prtd->period_index = 0;
		/* Configure McBSP internal buffer usage */
		if (dma_data->set_threshold)
			dma_data->set_threshold(substream);

		omap_start_dma(prtd->dma_ch);
		break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		prtd->period_index = -1;
		omap_stop_dma(prtd->dma_ch);
		break;
	default:
		ret = -EINVAL;
	}
	spin_unlock_irqrestore(&prtd->lock, flags);

	return ret;
}

static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct omap_runtime_data *prtd = runtime->private_data;
	dma_addr_t ptr;
	snd_pcm_uframes_t offset;

	if (cpu_is_omap1510()) {
		offset = prtd->period_index * runtime->period_size;
	} else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
		ptr = omap_get_dma_dst_pos(prtd->dma_ch);
		offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
	} else {
		ptr = omap_get_dma_src_pos(prtd->dma_ch);
		offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
	}

	if (offset >= runtime->buffer_size)
		offset = 0;

	return offset;
}

static int omap_pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct omap_runtime_data *prtd;
	int ret;

	snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);

	/* Ensure that buffer size is a multiple of period size */
	ret = snd_pcm_hw_constraint_integer(runtime,
					    SNDRV_PCM_HW_PARAM_PERIODS);
	if (ret < 0)
		goto out;

	prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
	if (prtd == NULL) {
		ret = -ENOMEM;
		goto out;
	}
	spin_lock_init(&prtd->lock);
	runtime->private_data = prtd;

out:
	return ret;
}

static int omap_pcm_close(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;

	kfree(runtime->private_data);
	return 0;
}

static int omap_pcm_mmap(struct snd_pcm_substream *substream,
	struct vm_area_struct *vma)
{
	struct snd_pcm_runtime *runtime = substream->runtime;

	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
				     runtime->dma_area,
				     runtime->dma_addr,
				     runtime->dma_bytes);
}

static struct snd_pcm_ops omap_pcm_ops = {
	.open		= omap_pcm_open,
	.close		= omap_pcm_close,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= omap_pcm_hw_params,
	.hw_free	= omap_pcm_hw_free,
	.prepare	= omap_pcm_prepare,
	.trigger	= omap_pcm_trigger,
	.pointer	= omap_pcm_pointer,
	.mmap		= omap_pcm_mmap,
};

static u64 omap_pcm_dmamask = DMA_BIT_MASK(64);

static int omap_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 = omap_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_writecombine(pcm->card->dev, size,
					   &buf->addr, GFP_KERNEL);
	if (!buf->area)
		return -ENOMEM;

	buf->bytes = size;
	return 0;
}

static void omap_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_writecombine(pcm->card->dev, buf->bytes,
				      buf->area, buf->addr);
		buf->area = NULL;
	}
}

static int omap_pcm_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 = &omap_pcm_dmamask;
	if (!card->dev->coherent_dma_mask)
		card->dev->coherent_dma_mask = DMA_BIT_MASK(64);

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

	if (dai->capture.channels_min) {
		ret = omap_pcm_preallocate_dma_buffer(pcm,
			SNDRV_PCM_STREAM_CAPTURE);
		if (ret)
			goto out;
	}

out:
	return ret;
}

struct snd_soc_platform omap_soc_platform = {
	.name		= "omap-pcm-audio",
	.pcm_ops 	= &omap_pcm_ops,
	.pcm_new	= omap_pcm_new,
	.pcm_free	= omap_pcm_free_dma_buffers,
};
EXPORT_SYMBOL_GPL(omap_soc_platform);

static int __init omap_soc_platform_init(void)
{
	return snd_soc_register_platform(&omap_soc_platform);
}
module_init(omap_soc_platform_init);

static void __exit omap_soc_platform_exit(void)
{
	snd_soc_unregister_platform(&omap_soc_platform);
}
module_exit(omap_soc_platform_exit);

MODULE_AUTHOR("Jarkko Nikula <jhnikula@gmail.com>");
MODULE_DESCRIPTION("OMAP PCM DMA module");
MODULE_LICENSE("GPL");
Commit	Line	Data
2e74796a JN	1	/*
	2	* omap-pcm.c -- ALSA PCM interface for the OMAP SoC
	3	*
	4	* Copyright (C) 2008 Nokia Corporation
	5	*
b08f7a62 JN	6	* Contact: Jarkko Nikula <jhnikula@gmail.com>
b08f7a62 JN	7	* Peter Ujfalusi <peter.ujfalusi@nokia.com>
2e74796a JN	8	*
	9	* This program is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU General Public License
	11	* version 2 as published by the Free Software Foundation.
	12	*
	13	* This program is distributed in the hope that it will be useful, but
	14	* WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	21	* 02110-1301 USA
	22	*
	23	*/
	24
	25	#include <linux/dma-mapping.h>
	26	#include <sound/core.h>
	27	#include <sound/pcm.h>
	28	#include <sound/pcm_params.h>
	29	#include <sound/soc.h>
	30
ce491cf8	31	#include <plat/dma.h>
2e74796a JN	32	#include "omap-pcm.h"
	33
	34	static const struct snd_pcm_hardware omap_pcm_hardware = {
	35	.info = SNDRV_PCM_INFO_MMAP \|
	36	SNDRV_PCM_INFO_MMAP_VALID \|
	37	SNDRV_PCM_INFO_INTERLEAVED \|
	38	SNDRV_PCM_INFO_PAUSE \|
	39	SNDRV_PCM_INFO_RESUME,
e17dd32f MLC	40	.formats = SNDRV_PCM_FMTBIT_S16_LE \|
e17dd32f MLC	41	SNDRV_PCM_FMTBIT_S32_LE,
2e74796a JN	42	.period_bytes_min = 32,
	43	.period_bytes_max = 64 * 1024,
	44	.periods_min = 2,
	45	.periods_max = 255,
	46	.buffer_bytes_max = 128 * 1024,
	47	};
	48
	49	struct omap_runtime_data {
	50	spinlock_t lock;
	51	struct omap_pcm_dma_data *dma_data;
	52	int dma_ch;
	53	int period_index;
	54	};
	55
	56	static void omap_pcm_dma_irq(int ch, u16 stat, void *data)
	57	{
	58	struct snd_pcm_substream *substream = data;
	59	struct snd_pcm_runtime *runtime = substream->runtime;
	60	struct omap_runtime_data *prtd = runtime->private_data;
	61	unsigned long flags;
	62
b5442a75	63	if ((cpu_is_omap1510())) {
2e74796a	64	/*
64844a6a JK	65	* OMAP1510 doesn't fully support DMA progress counter
64844a6a JK	66	* and there is no software emulation implemented yet,
b5442a75	67	* so have to maintain our own progress counters
64844a6a	68	* that can be used by omap_pcm_pointer() instead.
2e74796a JN	69	*/
2e74796a JN	70	spin_lock_irqsave(&prtd->lock, flags);
471e3dec JK	71	if ((stat == OMAP_DMA_LAST_IRQ) &&
	72	(prtd->period_index == runtime->periods - 1)) {
	73	/* we are in sync, do nothing */
	74	spin_unlock_irqrestore(&prtd->lock, flags);
	75	return;
	76	}
2e74796a	77	if (prtd->period_index >= 0) {
471e3dec JK	78	if (stat & OMAP_DMA_BLOCK_IRQ) {
	79	/* end of buffer reached, loop back */
	80	prtd->period_index = 0;
	81	} else if (stat & OMAP_DMA_LAST_IRQ) {
	82	/* update the counter for the last period */
	83	prtd->period_index = runtime->periods - 1;
	84	} else if (++prtd->period_index >= runtime->periods) {
	85	/* end of buffer missed? loop back */
2e74796a	86	prtd->period_index = 0;
2e74796a JN	87	}
	88	}
	89	spin_unlock_irqrestore(&prtd->lock, flags);
	90	}
	91
	92	snd_pcm_period_elapsed(substream);
	93	}
	94
	95	/* this may get called several times by oss emulation */
	96	static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
	97	struct snd_pcm_hw_params *params)
	98	{
	99	struct snd_pcm_runtime *runtime = substream->runtime;
	100	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	101	struct omap_runtime_data *prtd = runtime->private_data;
	102	struct omap_pcm_dma_data *dma_data = rtd->dai->cpu_dai->dma_data;
	103	int err = 0;
	104
1b4246a1 JS	105	/* return if this is a bufferless transfer e.g.
1b4246a1 JS	106	* codec <--> BT codec or GSM modem -- lg FIXME */
2e74796a	107	if (!dma_data)
1b4246a1	108	return 0;
2e74796a JN	109
	110	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	111	runtime->dma_bytes = params_buffer_bytes(params);
	112
	113	if (prtd->dma_data)
	114	return 0;
	115	prtd->dma_data = dma_data;
	116	err = omap_request_dma(dma_data->dma_req, dma_data->name,
	117	omap_pcm_dma_irq, substream, &prtd->dma_ch);
64844a6a	118	if (!err) {
2e74796a JN	119	/*
	120	* Link channel with itself so DMA doesn't need any
	121	* reprogramming while looping the buffer
	122	*/
	123	omap_dma_link_lch(prtd->dma_ch, prtd->dma_ch);
	124	}
	125
	126	return err;
	127	}
	128
	129	static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
	130	{
	131	struct snd_pcm_runtime *runtime = substream->runtime;
	132	struct omap_runtime_data *prtd = runtime->private_data;
	133
	134	if (prtd->dma_data == NULL)
	135	return 0;
	136
64844a6a	137	omap_dma_unlink_lch(prtd->dma_ch, prtd->dma_ch);
2e74796a JN	138	omap_free_dma(prtd->dma_ch);
	139	prtd->dma_data = NULL;
	140
	141	snd_pcm_set_runtime_buffer(substream, NULL);
	142
	143	return 0;
	144	}
	145
	146	static int omap_pcm_prepare(struct snd_pcm_substream *substream)
	147	{
	148	struct snd_pcm_runtime *runtime = substream->runtime;
	149	struct omap_runtime_data *prtd = runtime->private_data;
	150	struct omap_pcm_dma_data *dma_data = prtd->dma_data;
	151	struct omap_dma_channel_params dma_params;
e17dd32f	152	int bytes;
2e74796a	153
1b4246a1 JS	154	/* return if this is a bufferless transfer e.g.
	155	* codec <--> BT codec or GSM modem -- lg FIXME */
	156	if (!prtd->dma_data)
	157	return 0;
	158
2e74796a	159	memset(&dma_params, 0, sizeof(dma_params));
e17dd32f	160	dma_params.data_type = dma_data->data_type;
2e74796a	161	dma_params.trigger = dma_data->dma_req;
caebc0cb	162	dma_params.sync_mode = dma_data->sync_mode;
2e74796a JN	163	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	164	dma_params.src_amode = OMAP_DMA_AMODE_POST_INC;
	165	dma_params.dst_amode = OMAP_DMA_AMODE_CONSTANT;
	166	dma_params.src_or_dst_synch = OMAP_DMA_DST_SYNC;
	167	dma_params.src_start = runtime->dma_addr;
	168	dma_params.dst_start = dma_data->port_addr;
9d37484c	169	dma_params.dst_port = OMAP_DMA_PORT_MPUI;
e17dd32f	170	dma_params.dst_fi = dma_data->packet_size;
2e74796a JN	171	} else {
	172	dma_params.src_amode = OMAP_DMA_AMODE_CONSTANT;
	173	dma_params.dst_amode = OMAP_DMA_AMODE_POST_INC;
	174	dma_params.src_or_dst_synch = OMAP_DMA_SRC_SYNC;
	175	dma_params.src_start = dma_data->port_addr;
	176	dma_params.dst_start = runtime->dma_addr;
9d37484c	177	dma_params.src_port = OMAP_DMA_PORT_MPUI;
e17dd32f	178	dma_params.src_fi = dma_data->packet_size;
2e74796a JN	179	}
	180	/*
	181	* Set DMA transfer frame size equal to ALSA period size and frame
	182	* count as no. of ALSA periods. Then with DMA frame interrupt enabled,
	183	* we can transfer the whole ALSA buffer with single DMA transfer but
	184	* still can get an interrupt at each period bounary
	185	*/
e17dd32f MLC	186	bytes = snd_pcm_lib_period_bytes(substream);
e17dd32f MLC	187	dma_params.elem_count = bytes >> dma_data->data_type;
2e74796a JN	188	dma_params.frame_count = runtime->periods;
	189	omap_set_dma_params(prtd->dma_ch, &dma_params);
	190
b5442a75	191	if ((cpu_is_omap1510()))
471e3dec JK	192	omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ \|
	193	OMAP_DMA_LAST_IRQ \| OMAP_DMA_BLOCK_IRQ);
	194	else
	195	omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ);
2e74796a	196
4d187fb8 JK	197	if (!(cpu_class_is_omap1())) {
	198	omap_set_dma_src_burst_mode(prtd->dma_ch,
	199	OMAP_DMA_DATA_BURST_16);
	200	omap_set_dma_dest_burst_mode(prtd->dma_ch,
	201	OMAP_DMA_DATA_BURST_16);
	202	}
9599d485	203
2e74796a JN	204	return 0;
	205	}
	206
	207	static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	208	{
	209	struct snd_pcm_runtime *runtime = substream->runtime;
	210	struct omap_runtime_data *prtd = runtime->private_data;
caebc0cb	211	struct omap_pcm_dma_data *dma_data = prtd->dma_data;
21dff434	212	unsigned long flags;
2e74796a JN	213	int ret = 0;
2e74796a JN	214
21dff434	215	spin_lock_irqsave(&prtd->lock, flags);
2e74796a JN	216	switch (cmd) {
	217	case SNDRV_PCM_TRIGGER_START:
	218	case SNDRV_PCM_TRIGGER_RESUME:
	219	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	220	prtd->period_index = 0;
caebc0cb EV	221	/* Configure McBSP internal buffer usage */
	222	if (dma_data->set_threshold)
	223	dma_data->set_threshold(substream);
	224
2e74796a JN	225	omap_start_dma(prtd->dma_ch);
	226	break;
	227
	228	case SNDRV_PCM_TRIGGER_STOP:
	229	case SNDRV_PCM_TRIGGER_SUSPEND:
	230	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	231	prtd->period_index = -1;
	232	omap_stop_dma(prtd->dma_ch);
	233	break;
	234	default:
	235	ret = -EINVAL;
	236	}
21dff434	237	spin_unlock_irqrestore(&prtd->lock, flags);
2e74796a JN	238
	239	return ret;
	240	}
	241
	242	static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
	243	{
	244	struct snd_pcm_runtime *runtime = substream->runtime;
	245	struct omap_runtime_data *prtd = runtime->private_data;
	246	dma_addr_t ptr;
	247	snd_pcm_uframes_t offset;
	248
b5442a75 JK	249	if (cpu_is_omap1510()) {
	250	offset = prtd->period_index * runtime->period_size;
	251	} else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
2e74796a	252	ptr = omap_get_dma_dst_pos(prtd->dma_ch);
1bdd7419	253	offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
b5442a75	254	} else {
1bdd7419 JK	255	ptr = omap_get_dma_src_pos(prtd->dma_ch);
1bdd7419 JK	256	offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
b5442a75	257	}
2e74796a	258
2e74796a JN	259	if (offset >= runtime->buffer_size)
	260	offset = 0;
	261
	262	return offset;
	263	}
	264
	265	static int omap_pcm_open(struct snd_pcm_substream *substream)
	266	{
	267	struct snd_pcm_runtime *runtime = substream->runtime;
	268	struct omap_runtime_data *prtd;
	269	int ret;
	270
	271	snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
	272
	273	/* Ensure that buffer size is a multiple of period size */
	274	ret = snd_pcm_hw_constraint_integer(runtime,
	275	SNDRV_PCM_HW_PARAM_PERIODS);
	276	if (ret < 0)
	277	goto out;
	278
19b3f316	279	prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
2e74796a JN	280	if (prtd == NULL) {
	281	ret = -ENOMEM;
	282	goto out;
	283	}
	284	spin_lock_init(&prtd->lock);
	285	runtime->private_data = prtd;
	286
	287	out:
	288	return ret;
	289	}
	290
	291	static int omap_pcm_close(struct snd_pcm_substream *substream)
	292	{
	293	struct snd_pcm_runtime *runtime = substream->runtime;
	294
	295	kfree(runtime->private_data);
	296	return 0;
	297	}
	298
	299	static int omap_pcm_mmap(struct snd_pcm_substream *substream,
	300	struct vm_area_struct *vma)
	301	{
	302	struct snd_pcm_runtime *runtime = substream->runtime;
	303
	304	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
	305	runtime->dma_area,
	306	runtime->dma_addr,
	307	runtime->dma_bytes);
	308	}
	309
b2a19d02	310	static struct snd_pcm_ops omap_pcm_ops = {
2e74796a JN	311	.open = omap_pcm_open,
	312	.close = omap_pcm_close,
	313	.ioctl = snd_pcm_lib_ioctl,
	314	.hw_params = omap_pcm_hw_params,
	315	.hw_free = omap_pcm_hw_free,
	316	.prepare = omap_pcm_prepare,
	317	.trigger = omap_pcm_trigger,
	318	.pointer = omap_pcm_pointer,
	319	.mmap = omap_pcm_mmap,
	320	};
	321
a152ff24	322	static u64 omap_pcm_dmamask = DMA_BIT_MASK(64);
2e74796a JN	323
	324	static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
	325	int stream)
	326	{
	327	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	328	struct snd_dma_buffer *buf = &substream->dma_buffer;
	329	size_t size = omap_pcm_hardware.buffer_bytes_max;
	330
	331	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	332	buf->dev.dev = pcm->card->dev;
	333	buf->private_data = NULL;
	334	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
	335	&buf->addr, GFP_KERNEL);
	336	if (!buf->area)
	337	return -ENOMEM;
	338
	339	buf->bytes = size;
	340	return 0;
	341	}
	342
	343	static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
	344	{
	345	struct snd_pcm_substream *substream;
	346	struct snd_dma_buffer *buf;
	347	int stream;
	348
	349	for (stream = 0; stream < 2; stream++) {
	350	substream = pcm->streams[stream].substream;
	351	if (!substream)
	352	continue;
	353
	354	buf = &substream->dma_buffer;
	355	if (!buf->area)
	356	continue;
	357
	358	dma_free_writecombine(pcm->card->dev, buf->bytes,
	359	buf->area, buf->addr);
	360	buf->area = NULL;
	361	}
	362	}
	363
d756b277	364	static int omap_pcm_new(struct snd_card card, struct snd_soc_dai dai,
2e74796a JN	365	struct snd_pcm *pcm)
	366	{
	367	int ret = 0;
	368
	369	if (!card->dev->dma_mask)
	370	card->dev->dma_mask = &omap_pcm_dmamask;
	371	if (!card->dev->coherent_dma_mask)
a152ff24	372	card->dev->coherent_dma_mask = DMA_BIT_MASK(64);
2e74796a JN	373
	374	if (dai->playback.channels_min) {
	375	ret = omap_pcm_preallocate_dma_buffer(pcm,
	376	SNDRV_PCM_STREAM_PLAYBACK);
	377	if (ret)
	378	goto out;
	379	}
	380
	381	if (dai->capture.channels_min) {
	382	ret = omap_pcm_preallocate_dma_buffer(pcm,
	383	SNDRV_PCM_STREAM_CAPTURE);
	384	if (ret)
	385	goto out;
	386	}
	387
	388	out:
	389	return ret;
	390	}
	391
	392	struct snd_soc_platform omap_soc_platform = {
	393	.name = "omap-pcm-audio",
	394	.pcm_ops = &omap_pcm_ops,
	395	.pcm_new = omap_pcm_new,
	396	.pcm_free = omap_pcm_free_dma_buffers,
	397	};
	398	EXPORT_SYMBOL_GPL(omap_soc_platform);
	399
c9b3a40f	400	static int __init omap_soc_platform_init(void)
958e792c MB	401	{
	402	return snd_soc_register_platform(&omap_soc_platform);
	403	}
	404	module_init(omap_soc_platform_init);
	405
	406	static void __exit omap_soc_platform_exit(void)
	407	{
	408	snd_soc_unregister_platform(&omap_soc_platform);
	409	}
	410	module_exit(omap_soc_platform_exit);
	411
b08f7a62	412	MODULE_AUTHOR("Jarkko Nikula <jhnikula@gmail.com>");
2e74796a JN	413	MODULE_DESCRIPTION("OMAP PCM DMA module");
2e74796a JN	414	MODULE_LICENSE("GPL");