[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()) &&
			(substream->stream == SNDRV_PCM_STREAM_PLAYBACK)) {
		/*
		 * OMAP1510 doesn't fully support DMA progress counter
		 * and there is no software emulation implemented yet,
		 * so have to maintain our own playback progress counter
		 * 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()) &&
			(substream->stream == SNDRV_PCM_STREAM_PLAYBACK))
		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 (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 if (!(cpu_is_omap1510())) {
		ptr = omap_get_dma_src_pos(prtd->dma_ch);
		offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
	} else
		offset = prtd->period_index * runtime->period_size;

	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
64844a6a JK	63	if ((cpu_is_omap1510()) &&
64844a6a JK	64	(substream->stream == SNDRV_PCM_STREAM_PLAYBACK)) {
2e74796a	65	/*
64844a6a JK	66	* OMAP1510 doesn't fully support DMA progress counter
	67	* and there is no software emulation implemented yet,
	68	* so have to maintain our own playback progress counter
	69	* that can be used by omap_pcm_pointer() instead.
2e74796a JN	70	*/
2e74796a JN	71	spin_lock_irqsave(&prtd->lock, flags);
471e3dec JK	72	if ((stat == OMAP_DMA_LAST_IRQ) &&
	73	(prtd->period_index == runtime->periods - 1)) {
	74	/* we are in sync, do nothing */
	75	spin_unlock_irqrestore(&prtd->lock, flags);
	76	return;
	77	}
2e74796a	78	if (prtd->period_index >= 0) {
471e3dec JK	79	if (stat & OMAP_DMA_BLOCK_IRQ) {
	80	/* end of buffer reached, loop back */
	81	prtd->period_index = 0;
	82	} else if (stat & OMAP_DMA_LAST_IRQ) {
	83	/* update the counter for the last period */
	84	prtd->period_index = runtime->periods - 1;
	85	} else if (++prtd->period_index >= runtime->periods) {
	86	/* end of buffer missed? loop back */
2e74796a	87	prtd->period_index = 0;
2e74796a JN	88	}
	89	}
	90	spin_unlock_irqrestore(&prtd->lock, flags);
	91	}
	92
	93	snd_pcm_period_elapsed(substream);
	94	}
	95
	96	/* this may get called several times by oss emulation */
	97	static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
	98	struct snd_pcm_hw_params *params)
	99	{
	100	struct snd_pcm_runtime *runtime = substream->runtime;
	101	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	102	struct omap_runtime_data *prtd = runtime->private_data;
	103	struct omap_pcm_dma_data *dma_data = rtd->dai->cpu_dai->dma_data;
	104	int err = 0;
	105
1b4246a1 JS	106	/* return if this is a bufferless transfer e.g.
1b4246a1 JS	107	* codec <--> BT codec or GSM modem -- lg FIXME */
2e74796a	108	if (!dma_data)
1b4246a1	109	return 0;
2e74796a JN	110
	111	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	112	runtime->dma_bytes = params_buffer_bytes(params);
	113
	114	if (prtd->dma_data)
	115	return 0;
	116	prtd->dma_data = dma_data;
	117	err = omap_request_dma(dma_data->dma_req, dma_data->name,
	118	omap_pcm_dma_irq, substream, &prtd->dma_ch);
64844a6a	119	if (!err) {
2e74796a JN	120	/*
	121	* Link channel with itself so DMA doesn't need any
	122	* reprogramming while looping the buffer
	123	*/
	124	omap_dma_link_lch(prtd->dma_ch, prtd->dma_ch);
	125	}
	126
	127	return err;
	128	}
	129
	130	static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
	131	{
	132	struct snd_pcm_runtime *runtime = substream->runtime;
	133	struct omap_runtime_data *prtd = runtime->private_data;
	134
	135	if (prtd->dma_data == NULL)
	136	return 0;
	137
64844a6a	138	omap_dma_unlink_lch(prtd->dma_ch, prtd->dma_ch);
2e74796a JN	139	omap_free_dma(prtd->dma_ch);
	140	prtd->dma_data = NULL;
	141
	142	snd_pcm_set_runtime_buffer(substream, NULL);
	143
	144	return 0;
	145	}
	146
	147	static int omap_pcm_prepare(struct snd_pcm_substream *substream)
	148	{
	149	struct snd_pcm_runtime *runtime = substream->runtime;
	150	struct omap_runtime_data *prtd = runtime->private_data;
	151	struct omap_pcm_dma_data *dma_data = prtd->dma_data;
	152	struct omap_dma_channel_params dma_params;
e17dd32f	153	int bytes;
2e74796a	154
1b4246a1 JS	155	/* return if this is a bufferless transfer e.g.
	156	* codec <--> BT codec or GSM modem -- lg FIXME */
	157	if (!prtd->dma_data)
	158	return 0;
	159
2e74796a	160	memset(&dma_params, 0, sizeof(dma_params));
e17dd32f	161	dma_params.data_type = dma_data->data_type;
2e74796a	162	dma_params.trigger = dma_data->dma_req;
caebc0cb	163	dma_params.sync_mode = dma_data->sync_mode;
2e74796a JN	164	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	165	dma_params.src_amode = OMAP_DMA_AMODE_POST_INC;
	166	dma_params.dst_amode = OMAP_DMA_AMODE_CONSTANT;
	167	dma_params.src_or_dst_synch = OMAP_DMA_DST_SYNC;
	168	dma_params.src_start = runtime->dma_addr;
	169	dma_params.dst_start = dma_data->port_addr;
9d37484c	170	dma_params.dst_port = OMAP_DMA_PORT_MPUI;
e17dd32f	171	dma_params.dst_fi = dma_data->packet_size;
2e74796a JN	172	} else {
	173	dma_params.src_amode = OMAP_DMA_AMODE_CONSTANT;
	174	dma_params.dst_amode = OMAP_DMA_AMODE_POST_INC;
	175	dma_params.src_or_dst_synch = OMAP_DMA_SRC_SYNC;
	176	dma_params.src_start = dma_data->port_addr;
	177	dma_params.dst_start = runtime->dma_addr;
9d37484c	178	dma_params.src_port = OMAP_DMA_PORT_MPUI;
e17dd32f	179	dma_params.src_fi = dma_data->packet_size;
2e74796a JN	180	}
	181	/*
	182	* Set DMA transfer frame size equal to ALSA period size and frame
	183	* count as no. of ALSA periods. Then with DMA frame interrupt enabled,
	184	* we can transfer the whole ALSA buffer with single DMA transfer but
	185	* still can get an interrupt at each period bounary
	186	*/
e17dd32f MLC	187	bytes = snd_pcm_lib_period_bytes(substream);
e17dd32f MLC	188	dma_params.elem_count = bytes >> dma_data->data_type;
2e74796a JN	189	dma_params.frame_count = runtime->periods;
	190	omap_set_dma_params(prtd->dma_ch, &dma_params);
	191
471e3dec JK	192	if ((cpu_is_omap1510()) &&
	193	(substream->stream == SNDRV_PCM_STREAM_PLAYBACK))
	194	omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ \|
	195	OMAP_DMA_LAST_IRQ \| OMAP_DMA_BLOCK_IRQ);
	196	else
	197	omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ);
2e74796a	198
4d187fb8 JK	199	if (!(cpu_class_is_omap1())) {
	200	omap_set_dma_src_burst_mode(prtd->dma_ch,
	201	OMAP_DMA_DATA_BURST_16);
	202	omap_set_dma_dest_burst_mode(prtd->dma_ch,
	203	OMAP_DMA_DATA_BURST_16);
	204	}
9599d485	205
2e74796a JN	206	return 0;
	207	}
	208
	209	static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	210	{
	211	struct snd_pcm_runtime *runtime = substream->runtime;
	212	struct omap_runtime_data *prtd = runtime->private_data;
caebc0cb	213	struct omap_pcm_dma_data *dma_data = prtd->dma_data;
21dff434	214	unsigned long flags;
2e74796a JN	215	int ret = 0;
2e74796a JN	216
21dff434	217	spin_lock_irqsave(&prtd->lock, flags);
2e74796a JN	218	switch (cmd) {
	219	case SNDRV_PCM_TRIGGER_START:
	220	case SNDRV_PCM_TRIGGER_RESUME:
	221	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	222	prtd->period_index = 0;
caebc0cb EV	223	/* Configure McBSP internal buffer usage */
	224	if (dma_data->set_threshold)
	225	dma_data->set_threshold(substream);
	226
2e74796a JN	227	omap_start_dma(prtd->dma_ch);
	228	break;
	229
	230	case SNDRV_PCM_TRIGGER_STOP:
	231	case SNDRV_PCM_TRIGGER_SUSPEND:
	232	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	233	prtd->period_index = -1;
	234	omap_stop_dma(prtd->dma_ch);
	235	break;
	236	default:
	237	ret = -EINVAL;
	238	}
21dff434	239	spin_unlock_irqrestore(&prtd->lock, flags);
2e74796a JN	240
	241	return ret;
	242	}
	243
	244	static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
	245	{
	246	struct snd_pcm_runtime *runtime = substream->runtime;
	247	struct omap_runtime_data *prtd = runtime->private_data;
	248	dma_addr_t ptr;
	249	snd_pcm_uframes_t offset;
	250
1bdd7419	251	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
2e74796a	252	ptr = omap_get_dma_dst_pos(prtd->dma_ch);
1bdd7419 JK	253	offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
	254	} else if (!(cpu_is_omap1510())) {
	255	ptr = omap_get_dma_src_pos(prtd->dma_ch);
	256	offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
	257	} else
	258	offset = prtd->period_index * runtime->period_size;
2e74796a	259
2e74796a JN	260	if (offset >= runtime->buffer_size)
	261	offset = 0;
	262
	263	return offset;
	264	}
	265
	266	static int omap_pcm_open(struct snd_pcm_substream *substream)
	267	{
	268	struct snd_pcm_runtime *runtime = substream->runtime;
	269	struct omap_runtime_data *prtd;
	270	int ret;
	271
	272	snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
	273
	274	/* Ensure that buffer size is a multiple of period size */
	275	ret = snd_pcm_hw_constraint_integer(runtime,
	276	SNDRV_PCM_HW_PARAM_PERIODS);
	277	if (ret < 0)
	278	goto out;
	279
19b3f316	280	prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
2e74796a JN	281	if (prtd == NULL) {
	282	ret = -ENOMEM;
	283	goto out;
	284	}
	285	spin_lock_init(&prtd->lock);
	286	runtime->private_data = prtd;
	287
	288	out:
	289	return ret;
	290	}
	291
	292	static int omap_pcm_close(struct snd_pcm_substream *substream)
	293	{
	294	struct snd_pcm_runtime *runtime = substream->runtime;
	295
	296	kfree(runtime->private_data);
	297	return 0;
	298	}
	299
	300	static int omap_pcm_mmap(struct snd_pcm_substream *substream,
	301	struct vm_area_struct *vma)
	302	{
	303	struct snd_pcm_runtime *runtime = substream->runtime;
	304
	305	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
	306	runtime->dma_area,
	307	runtime->dma_addr,
	308	runtime->dma_bytes);
	309	}
	310
b2a19d02	311	static struct snd_pcm_ops omap_pcm_ops = {
2e74796a JN	312	.open = omap_pcm_open,
	313	.close = omap_pcm_close,
	314	.ioctl = snd_pcm_lib_ioctl,
	315	.hw_params = omap_pcm_hw_params,
	316	.hw_free = omap_pcm_hw_free,
	317	.prepare = omap_pcm_prepare,
	318	.trigger = omap_pcm_trigger,
	319	.pointer = omap_pcm_pointer,
	320	.mmap = omap_pcm_mmap,
	321	};
	322
a152ff24	323	static u64 omap_pcm_dmamask = DMA_BIT_MASK(64);
2e74796a JN	324
	325	static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
	326	int stream)
	327	{
	328	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	329	struct snd_dma_buffer *buf = &substream->dma_buffer;
	330	size_t size = omap_pcm_hardware.buffer_bytes_max;
	331
	332	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	333	buf->dev.dev = pcm->card->dev;
	334	buf->private_data = NULL;
	335	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
	336	&buf->addr, GFP_KERNEL);
	337	if (!buf->area)
	338	return -ENOMEM;
	339
	340	buf->bytes = size;
	341	return 0;
	342	}
	343
	344	static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
	345	{
	346	struct snd_pcm_substream *substream;
	347	struct snd_dma_buffer *buf;
	348	int stream;
	349
	350	for (stream = 0; stream < 2; stream++) {
	351	substream = pcm->streams[stream].substream;
	352	if (!substream)
	353	continue;
	354
	355	buf = &substream->dma_buffer;
	356	if (!buf->area)
	357	continue;
	358
	359	dma_free_writecombine(pcm->card->dev, buf->bytes,
	360	buf->area, buf->addr);
	361	buf->area = NULL;
	362	}
	363	}
	364
d756b277	365	static int omap_pcm_new(struct snd_card card, struct snd_soc_dai dai,
2e74796a JN	366	struct snd_pcm *pcm)
	367	{
	368	int ret = 0;
	369
	370	if (!card->dev->dma_mask)
	371	card->dev->dma_mask = &omap_pcm_dmamask;
	372	if (!card->dev->coherent_dma_mask)
a152ff24	373	card->dev->coherent_dma_mask = DMA_BIT_MASK(64);
2e74796a JN	374
	375	if (dai->playback.channels_min) {
	376	ret = omap_pcm_preallocate_dma_buffer(pcm,
	377	SNDRV_PCM_STREAM_PLAYBACK);
	378	if (ret)
	379	goto out;
	380	}
	381
	382	if (dai->capture.channels_min) {
	383	ret = omap_pcm_preallocate_dma_buffer(pcm,
	384	SNDRV_PCM_STREAM_CAPTURE);
	385	if (ret)
	386	goto out;
	387	}
	388
	389	out:
	390	return ret;
	391	}
	392
	393	struct snd_soc_platform omap_soc_platform = {
	394	.name = "omap-pcm-audio",
	395	.pcm_ops = &omap_pcm_ops,
	396	.pcm_new = omap_pcm_new,
	397	.pcm_free = omap_pcm_free_dma_buffers,
	398	};
	399	EXPORT_SYMBOL_GPL(omap_soc_platform);
	400
c9b3a40f	401	static int __init omap_soc_platform_init(void)
958e792c MB	402	{
	403	return snd_soc_register_platform(&omap_soc_platform);
	404	}
	405	module_init(omap_soc_platform_init);
	406
	407	static void __exit omap_soc_platform_exit(void)
	408	{
	409	snd_soc_unregister_platform(&omap_soc_platform);
	410	}
	411	module_exit(omap_soc_platform_exit);
	412
b08f7a62	413	MODULE_AUTHOR("Jarkko Nikula <jhnikula@gmail.com>");
2e74796a JN	414	MODULE_DESCRIPTION("OMAP PCM DMA module");
2e74796a JN	415	MODULE_LICENSE("GPL");