[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@ti.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 <linux/slab.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;

	int err = 0;

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

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

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

out:
	return ret;
}

static struct snd_soc_platform_driver omap_soc_platform = {
	.ops		= &omap_pcm_ops,
	.pcm_new	= omap_pcm_new,
	.pcm_free	= omap_pcm_free_dma_buffers,
};

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

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

static struct platform_driver omap_pcm_driver = {
	.driver = {
			.name = "omap-pcm-audio",
			.owner = THIS_MODULE,
	},

	.probe = omap_pcm_probe,
	.remove = __devexit_p(omap_pcm_remove),
};

static int __init snd_omap_pcm_init(void)
{
	return platform_driver_register(&omap_pcm_driver);
}
module_init(snd_omap_pcm_init);

static void __exit snd_omap_pcm_exit(void)
{
	platform_driver_unregister(&omap_pcm_driver);
}
module_exit(snd_omap_pcm_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	6	* Contact: Jarkko Nikula <jhnikula@gmail.com>
1c7687b9	7	* Peter Ujfalusi <peter.ujfalusi@ti.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>
5a0e3ad6	26	#include <linux/slab.h>
2e74796a JN	27	#include <sound/core.h>
	28	#include <sound/pcm.h>
	29	#include <sound/pcm_params.h>
	30	#include <sound/soc.h>
	31
ce491cf8	32	#include <plat/dma.h>
2e74796a JN	33	#include "omap-pcm.h"
	34
	35	static const struct snd_pcm_hardware omap_pcm_hardware = {
	36	.info = SNDRV_PCM_INFO_MMAP \|
	37	SNDRV_PCM_INFO_MMAP_VALID \|
	38	SNDRV_PCM_INFO_INTERLEAVED \|
	39	SNDRV_PCM_INFO_PAUSE \|
	40	SNDRV_PCM_INFO_RESUME,
e17dd32f MLC	41	.formats = SNDRV_PCM_FMTBIT_S16_LE \|
e17dd32f MLC	42	SNDRV_PCM_FMTBIT_S32_LE,
2e74796a JN	43	.period_bytes_min = 32,
	44	.period_bytes_max = 64 * 1024,
	45	.periods_min = 2,
	46	.periods_max = 255,
	47	.buffer_bytes_max = 128 * 1024,
	48	};
	49
	50	struct omap_runtime_data {
	51	spinlock_t lock;
	52	struct omap_pcm_dma_data *dma_data;
	53	int dma_ch;
	54	int period_index;
	55	};
	56
	57	static void omap_pcm_dma_irq(int ch, u16 stat, void *data)
	58	{
	59	struct snd_pcm_substream *substream = data;
	60	struct snd_pcm_runtime *runtime = substream->runtime;
	61	struct omap_runtime_data *prtd = runtime->private_data;
	62	unsigned long flags;
	63
b5442a75	64	if ((cpu_is_omap1510())) {
2e74796a	65	/*
64844a6a JK	66	* OMAP1510 doesn't fully support DMA progress counter
64844a6a JK	67	* and there is no software emulation implemented yet,
b5442a75	68	* so have to maintain our own progress counters
64844a6a	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;
5f712b2b	103	struct omap_pcm_dma_data *dma_data;
f0fba2ad	104
2e74796a JN	105	int err = 0;
2e74796a JN	106
f0fba2ad	107	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
5f712b2b	108
1b4246a1 JS	109	/* return if this is a bufferless transfer e.g.
1b4246a1 JS	110	* codec <--> BT codec or GSM modem -- lg FIXME */
2e74796a	111	if (!dma_data)
1b4246a1	112	return 0;
2e74796a JN	113
	114	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	115	runtime->dma_bytes = params_buffer_bytes(params);
	116
	117	if (prtd->dma_data)
	118	return 0;
	119	prtd->dma_data = dma_data;
	120	err = omap_request_dma(dma_data->dma_req, dma_data->name,
	121	omap_pcm_dma_irq, substream, &prtd->dma_ch);
64844a6a	122	if (!err) {
2e74796a JN	123	/*
	124	* Link channel with itself so DMA doesn't need any
	125	* reprogramming while looping the buffer
	126	*/
	127	omap_dma_link_lch(prtd->dma_ch, prtd->dma_ch);
	128	}
	129
	130	return err;
	131	}
	132
	133	static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
	134	{
	135	struct snd_pcm_runtime *runtime = substream->runtime;
	136	struct omap_runtime_data *prtd = runtime->private_data;
	137
	138	if (prtd->dma_data == NULL)
	139	return 0;
	140
64844a6a	141	omap_dma_unlink_lch(prtd->dma_ch, prtd->dma_ch);
2e74796a JN	142	omap_free_dma(prtd->dma_ch);
	143	prtd->dma_data = NULL;
	144
	145	snd_pcm_set_runtime_buffer(substream, NULL);
	146
	147	return 0;
	148	}
	149
	150	static int omap_pcm_prepare(struct snd_pcm_substream *substream)
	151	{
	152	struct snd_pcm_runtime *runtime = substream->runtime;
	153	struct omap_runtime_data *prtd = runtime->private_data;
	154	struct omap_pcm_dma_data *dma_data = prtd->dma_data;
	155	struct omap_dma_channel_params dma_params;
e17dd32f	156	int bytes;
2e74796a	157
1b4246a1 JS	158	/* return if this is a bufferless transfer e.g.
	159	* codec <--> BT codec or GSM modem -- lg FIXME */
	160	if (!prtd->dma_data)
	161	return 0;
	162
2e74796a	163	memset(&dma_params, 0, sizeof(dma_params));
e17dd32f	164	dma_params.data_type = dma_data->data_type;
2e74796a	165	dma_params.trigger = dma_data->dma_req;
caebc0cb	166	dma_params.sync_mode = dma_data->sync_mode;
2e74796a JN	167	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	168	dma_params.src_amode = OMAP_DMA_AMODE_POST_INC;
	169	dma_params.dst_amode = OMAP_DMA_AMODE_CONSTANT;
	170	dma_params.src_or_dst_synch = OMAP_DMA_DST_SYNC;
	171	dma_params.src_start = runtime->dma_addr;
	172	dma_params.dst_start = dma_data->port_addr;
9d37484c	173	dma_params.dst_port = OMAP_DMA_PORT_MPUI;
e17dd32f	174	dma_params.dst_fi = dma_data->packet_size;
2e74796a JN	175	} else {
	176	dma_params.src_amode = OMAP_DMA_AMODE_CONSTANT;
	177	dma_params.dst_amode = OMAP_DMA_AMODE_POST_INC;
	178	dma_params.src_or_dst_synch = OMAP_DMA_SRC_SYNC;
	179	dma_params.src_start = dma_data->port_addr;
	180	dma_params.dst_start = runtime->dma_addr;
9d37484c	181	dma_params.src_port = OMAP_DMA_PORT_MPUI;
e17dd32f	182	dma_params.src_fi = dma_data->packet_size;
2e74796a JN	183	}
	184	/*
	185	* Set DMA transfer frame size equal to ALSA period size and frame
	186	* count as no. of ALSA periods. Then with DMA frame interrupt enabled,
	187	* we can transfer the whole ALSA buffer with single DMA transfer but
	188	* still can get an interrupt at each period bounary
	189	*/
e17dd32f MLC	190	bytes = snd_pcm_lib_period_bytes(substream);
e17dd32f MLC	191	dma_params.elem_count = bytes >> dma_data->data_type;
2e74796a JN	192	dma_params.frame_count = runtime->periods;
	193	omap_set_dma_params(prtd->dma_ch, &dma_params);
	194
b5442a75	195	if ((cpu_is_omap1510()))
471e3dec JK	196	omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ \|
	197	OMAP_DMA_LAST_IRQ \| OMAP_DMA_BLOCK_IRQ);
	198	else
	199	omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ);
2e74796a	200
4d187fb8 JK	201	if (!(cpu_class_is_omap1())) {
	202	omap_set_dma_src_burst_mode(prtd->dma_ch,
	203	OMAP_DMA_DATA_BURST_16);
	204	omap_set_dma_dest_burst_mode(prtd->dma_ch,
	205	OMAP_DMA_DATA_BURST_16);
	206	}
9599d485	207
2e74796a JN	208	return 0;
	209	}
	210
	211	static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	212	{
	213	struct snd_pcm_runtime *runtime = substream->runtime;
	214	struct omap_runtime_data *prtd = runtime->private_data;
caebc0cb	215	struct omap_pcm_dma_data *dma_data = prtd->dma_data;
21dff434	216	unsigned long flags;
2e74796a JN	217	int ret = 0;
2e74796a JN	218
21dff434	219	spin_lock_irqsave(&prtd->lock, flags);
2e74796a JN	220	switch (cmd) {
	221	case SNDRV_PCM_TRIGGER_START:
	222	case SNDRV_PCM_TRIGGER_RESUME:
	223	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	224	prtd->period_index = 0;
caebc0cb EV	225	/* Configure McBSP internal buffer usage */
	226	if (dma_data->set_threshold)
	227	dma_data->set_threshold(substream);
	228
2e74796a JN	229	omap_start_dma(prtd->dma_ch);
	230	break;
	231
	232	case SNDRV_PCM_TRIGGER_STOP:
	233	case SNDRV_PCM_TRIGGER_SUSPEND:
	234	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	235	prtd->period_index = -1;
	236	omap_stop_dma(prtd->dma_ch);
	237	break;
	238	default:
	239	ret = -EINVAL;
	240	}
21dff434	241	spin_unlock_irqrestore(&prtd->lock, flags);
2e74796a JN	242
	243	return ret;
	244	}
	245
	246	static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
	247	{
	248	struct snd_pcm_runtime *runtime = substream->runtime;
	249	struct omap_runtime_data *prtd = runtime->private_data;
	250	dma_addr_t ptr;
	251	snd_pcm_uframes_t offset;
	252
b5442a75 JK	253	if (cpu_is_omap1510()) {
	254	offset = prtd->period_index * runtime->period_size;
	255	} else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
2e74796a	256	ptr = omap_get_dma_dst_pos(prtd->dma_ch);
1bdd7419	257	offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
b5442a75	258	} else {
1bdd7419 JK	259	ptr = omap_get_dma_src_pos(prtd->dma_ch);
1bdd7419 JK	260	offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
b5442a75	261	}
2e74796a	262
2e74796a JN	263	if (offset >= runtime->buffer_size)
	264	offset = 0;
	265
	266	return offset;
	267	}
	268
	269	static int omap_pcm_open(struct snd_pcm_substream *substream)
	270	{
	271	struct snd_pcm_runtime *runtime = substream->runtime;
	272	struct omap_runtime_data *prtd;
	273	int ret;
	274
	275	snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
	276
	277	/* Ensure that buffer size is a multiple of period size */
	278	ret = snd_pcm_hw_constraint_integer(runtime,
	279	SNDRV_PCM_HW_PARAM_PERIODS);
	280	if (ret < 0)
	281	goto out;
	282
19b3f316	283	prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
2e74796a JN	284	if (prtd == NULL) {
	285	ret = -ENOMEM;
	286	goto out;
	287	}
	288	spin_lock_init(&prtd->lock);
	289	runtime->private_data = prtd;
	290
	291	out:
	292	return ret;
	293	}
	294
	295	static int omap_pcm_close(struct snd_pcm_substream *substream)
	296	{
	297	struct snd_pcm_runtime *runtime = substream->runtime;
	298
	299	kfree(runtime->private_data);
	300	return 0;
	301	}
	302
	303	static int omap_pcm_mmap(struct snd_pcm_substream *substream,
	304	struct vm_area_struct *vma)
	305	{
	306	struct snd_pcm_runtime *runtime = substream->runtime;
	307
	308	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
	309	runtime->dma_area,
	310	runtime->dma_addr,
	311	runtime->dma_bytes);
	312	}
	313
b2a19d02	314	static struct snd_pcm_ops omap_pcm_ops = {
2e74796a JN	315	.open = omap_pcm_open,
	316	.close = omap_pcm_close,
	317	.ioctl = snd_pcm_lib_ioctl,
	318	.hw_params = omap_pcm_hw_params,
	319	.hw_free = omap_pcm_hw_free,
	320	.prepare = omap_pcm_prepare,
	321	.trigger = omap_pcm_trigger,
	322	.pointer = omap_pcm_pointer,
	323	.mmap = omap_pcm_mmap,
	324	};
	325
a152ff24	326	static u64 omap_pcm_dmamask = DMA_BIT_MASK(64);
2e74796a JN	327
	328	static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
	329	int stream)
	330	{
	331	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	332	struct snd_dma_buffer *buf = &substream->dma_buffer;
	333	size_t size = omap_pcm_hardware.buffer_bytes_max;
	334
	335	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	336	buf->dev.dev = pcm->card->dev;
	337	buf->private_data = NULL;
	338	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
	339	&buf->addr, GFP_KERNEL);
	340	if (!buf->area)
	341	return -ENOMEM;
	342
	343	buf->bytes = size;
	344	return 0;
	345	}
	346
	347	static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
	348	{
	349	struct snd_pcm_substream *substream;
	350	struct snd_dma_buffer *buf;
	351	int stream;
	352
	353	for (stream = 0; stream < 2; stream++) {
	354	substream = pcm->streams[stream].substream;
	355	if (!substream)
	356	continue;
	357
	358	buf = &substream->dma_buffer;
	359	if (!buf->area)
	360	continue;
	361
	362	dma_free_writecombine(pcm->card->dev, buf->bytes,
	363	buf->area, buf->addr);
	364	buf->area = NULL;
	365	}
	366	}
	367
d756b277	368	static int omap_pcm_new(struct snd_card card, struct snd_soc_dai dai,
2e74796a JN	369	struct snd_pcm *pcm)
	370	{
	371	int ret = 0;
	372
	373	if (!card->dev->dma_mask)
	374	card->dev->dma_mask = &omap_pcm_dmamask;
	375	if (!card->dev->coherent_dma_mask)
a152ff24	376	card->dev->coherent_dma_mask = DMA_BIT_MASK(64);
2e74796a	377
f0fba2ad	378	if (dai->driver->playback.channels_min) {
2e74796a JN	379	ret = omap_pcm_preallocate_dma_buffer(pcm,
	380	SNDRV_PCM_STREAM_PLAYBACK);
	381	if (ret)
	382	goto out;
	383	}
	384
f0fba2ad	385	if (dai->driver->capture.channels_min) {
2e74796a JN	386	ret = omap_pcm_preallocate_dma_buffer(pcm,
	387	SNDRV_PCM_STREAM_CAPTURE);
	388	if (ret)
	389	goto out;
	390	}
	391
	392	out:
	393	return ret;
	394	}
	395
f0fba2ad LG	396	static struct snd_soc_platform_driver omap_soc_platform = {
f0fba2ad LG	397	.ops = &omap_pcm_ops,
2e74796a JN	398	.pcm_new = omap_pcm_new,
	399	.pcm_free = omap_pcm_free_dma_buffers,
	400	};
2e74796a	401
f0fba2ad LG	402	static __devinit int omap_pcm_probe(struct platform_device *pdev)
	403	{
	404	return snd_soc_register_platform(&pdev->dev,
	405	&omap_soc_platform);
	406	}
	407
	408	static int __devexit omap_pcm_remove(struct platform_device *pdev)
	409	{
	410	snd_soc_unregister_platform(&pdev->dev);
	411	return 0;
	412	}
	413
	414	static struct platform_driver omap_pcm_driver = {
	415	.driver = {
	416	.name = "omap-pcm-audio",
	417	.owner = THIS_MODULE,
	418	},
	419
	420	.probe = omap_pcm_probe,
	421	.remove = __devexit_p(omap_pcm_remove),
	422	};
	423
	424	static int __init snd_omap_pcm_init(void)
958e792c	425	{
f0fba2ad	426	return platform_driver_register(&omap_pcm_driver);
958e792c	427	}
f0fba2ad	428	module_init(snd_omap_pcm_init);
958e792c	429
f0fba2ad	430	static void __exit snd_omap_pcm_exit(void)
958e792c	431	{
f0fba2ad	432	platform_driver_unregister(&omap_pcm_driver);
958e792c	433	}
f0fba2ad	434	module_exit(snd_omap_pcm_exit);
958e792c	435
b08f7a62	436	MODULE_AUTHOR("Jarkko Nikula <jhnikula@gmail.com>");
2e74796a JN	437	MODULE_DESCRIPTION("OMAP PCM DMA module");
2e74796a JN	438	MODULE_LICENSE("GPL");