[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 <jarkko.nikula@bitmer.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 <linux/module.h>
#include <linux/omap-dma.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/dmaengine_pcm.h>
#include <sound/soc.h>
#include <sound/omap-pcm.h>

#ifdef CONFIG_ARCH_OMAP1
#define pcm_omap1510()	cpu_is_omap1510()
#else
#define pcm_omap1510()	0
#endif

static 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 |
				  SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
	.period_bytes_min	= 32,
	.period_bytes_max	= 64 * 1024,
	.periods_min		= 2,
	.periods_max		= 255,
	.buffer_bytes_max	= 128 * 1024,
};

/* sDMA supports only 1, 2, and 4 byte transfer elements. */
static void omap_pcm_limit_supported_formats(void)
{
	int i;

	for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
		switch (snd_pcm_format_physical_width(i)) {
		case 8:
		case 16:
		case 32:
			omap_pcm_hardware.formats |= (1LL << i);
			break;
		default:
			break;
		}
	}
}

/* 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_pcm_dma_data *dma_data;
	struct dma_slave_config config;
	struct dma_chan *chan;
	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);

	chan = snd_dmaengine_pcm_get_chan(substream);
	if (!chan)
		return -EINVAL;

	/* fills in addr_width and direction */
	err = snd_hwparams_to_dma_slave_config(substream, params, &config);
	if (err)
		return err;

	snd_dmaengine_pcm_set_config_from_dai_data(substream,
			snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
			&config);

	return dmaengine_slave_config(chan, &config);
}

static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
{
	snd_pcm_set_runtime_buffer(substream, NULL);
	return 0;
}

static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
{
	snd_pcm_uframes_t offset;

	if (pcm_omap1510())
		offset = snd_dmaengine_pcm_pointer_no_residue(substream);
	else
		offset = snd_dmaengine_pcm_pointer(substream);

	return offset;
}

static int omap_pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_dmaengine_dai_dma_data *dma_data;
	int ret;

	snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);

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

	/* DT boot: filter_data is the DMA name */
	if (rtd->cpu_dai->dev->of_node) {
		struct dma_chan *chan;

		chan = dma_request_slave_channel(rtd->cpu_dai->dev,
						 dma_data->filter_data);
		ret = snd_dmaengine_pcm_open(substream, chan);
	} else {
		ret = snd_dmaengine_pcm_open_request_chan(substream,
							  omap_dma_filter_fn,
							  dma_data->filter_data);
	}
	return ret;
}

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		= snd_dmaengine_pcm_close_release_chan,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= omap_pcm_hw_params,
	.hw_free	= omap_pcm_hw_free,
	.trigger	= snd_dmaengine_pcm_trigger,
	.pointer	= omap_pcm_pointer,
	.mmap		= omap_pcm_mmap,
};

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_soc_pcm_runtime *rtd)
{
	struct snd_card *card = rtd->card->snd_card;
	struct snd_pcm *pcm = rtd->pcm;
	int ret;

	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
	if (ret)
		return ret;

	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
		ret = omap_pcm_preallocate_dma_buffer(pcm,
			SNDRV_PCM_STREAM_PLAYBACK);
		if (ret)
			goto out;
	}

	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
		ret = omap_pcm_preallocate_dma_buffer(pcm,
			SNDRV_PCM_STREAM_CAPTURE);
		if (ret)
			goto out;
	}

out:
	/* free preallocated buffers in case of error */
	if (ret)
		omap_pcm_free_dma_buffers(pcm);

	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,
};

int omap_pcm_platform_register(struct device *dev)
{
	omap_pcm_limit_supported_formats();
	return devm_snd_soc_register_platform(dev, &omap_soc_platform);
}
EXPORT_SYMBOL_GPL(omap_pcm_platform_register);

MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.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	*
7ec41ee5	6	* Contact: Jarkko Nikula <jarkko.nikula@bitmer.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>
da155d5b	27	#include <linux/module.h>
946cc36a	28	#include <linux/omap-dma.h>
2e74796a JN	29	#include <sound/core.h>
	30	#include <sound/pcm.h>
	31	#include <sound/pcm_params.h>
946cc36a	32	#include <sound/dmaengine_pcm.h>
2e74796a	33	#include <sound/soc.h>
76a77f47	34	#include <sound/omap-pcm.h>
2e74796a	35
27615a97 TL	36	#ifdef CONFIG_ARCH_OMAP1
	37	#define pcm_omap1510() cpu_is_omap1510()
	38	#else
	39	#define pcm_omap1510() 0
	40	#endif
	41
6742e15c	42	static struct snd_pcm_hardware omap_pcm_hardware = {
2e74796a JN	43	.info = SNDRV_PCM_INFO_MMAP \|
	44	SNDRV_PCM_INFO_MMAP_VALID \|
	45	SNDRV_PCM_INFO_INTERLEAVED \|
	46	SNDRV_PCM_INFO_PAUSE \|
b4173824 PU	47	SNDRV_PCM_INFO_RESUME \|
b4173824 PU	48	SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
2e74796a JN	49	.period_bytes_min = 32,
	50	.period_bytes_max = 64 * 1024,
	51	.periods_min = 2,
	52	.periods_max = 255,
	53	.buffer_bytes_max = 128 * 1024,
	54	};
	55
6742e15c JS	56	/* sDMA supports only 1, 2, and 4 byte transfer elements. */
	57	static void omap_pcm_limit_supported_formats(void)
	58	{
	59	int i;
	60
	61	for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
	62	switch (snd_pcm_format_physical_width(i)) {
	63	case 8:
	64	case 16:
	65	case 32:
	66	omap_pcm_hardware.formats \|= (1LL << i);
	67	break;
	68	default:
	69	break;
	70	}
	71	}
	72	}
	73
2e74796a JN	74	/* this may get called several times by oss emulation */
	75	static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
	76	struct snd_pcm_hw_params *params)
	77	{
	78	struct snd_pcm_runtime *runtime = substream->runtime;
	79	struct snd_soc_pcm_runtime *rtd = substream->private_data;
5f712b2b	80	struct omap_pcm_dma_data *dma_data;
946cc36a PU	81	struct dma_slave_config config;
946cc36a PU	82	struct dma_chan *chan;
2e74796a JN	83	int err = 0;
2e74796a JN	84
f0fba2ad	85	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
5f712b2b	86
1b4246a1 JS	87	/* return if this is a bufferless transfer e.g.
1b4246a1 JS	88	* codec <--> BT codec or GSM modem -- lg FIXME */
2e74796a	89	if (!dma_data)
1b4246a1	90	return 0;
2e74796a JN	91
	92	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	93	runtime->dma_bytes = params_buffer_bytes(params);
	94
946cc36a PU	95	chan = snd_dmaengine_pcm_get_chan(substream);
	96	if (!chan)
	97	return -EINVAL;
2e74796a	98
946cc36a PU	99	/* fills in addr_width and direction */
	100	err = snd_hwparams_to_dma_slave_config(substream, params, &config);
	101	if (err)
	102	return err;
2e74796a	103
09ae3aaf LPC	104	snd_dmaengine_pcm_set_config_from_dai_data(substream,
	105	snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
	106	&config);
2e74796a	107
946cc36a	108	return dmaengine_slave_config(chan, &config);
2e74796a JN	109	}
2e74796a JN	110
946cc36a	111	static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
2e74796a	112	{
946cc36a	113	snd_pcm_set_runtime_buffer(substream, NULL);
2e74796a JN	114	return 0;
	115	}
	116
2e74796a JN	117	static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
2e74796a JN	118	{
2e74796a JN	119	snd_pcm_uframes_t offset;
2e74796a JN	120
27615a97	121	if (pcm_omap1510())
946cc36a PU	122	offset = snd_dmaengine_pcm_pointer_no_residue(substream);
	123	else
	124	offset = snd_dmaengine_pcm_pointer(substream);
2e74796a JN	125
	126	return offset;
	127	}
	128
	129	static int omap_pcm_open(struct snd_pcm_substream *substream)
	130	{
946cc36a	131	struct snd_soc_pcm_runtime *rtd = substream->private_data;
09ae3aaf	132	struct snd_dmaengine_dai_dma_data *dma_data;
f6becf0b	133	int ret;
2e74796a JN	134
	135	snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
	136
946cc36a	137	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
a92b5317	138
f6becf0b PU	139	/* DT boot: filter_data is the DMA name */
	140	if (rtd->cpu_dai->dev->of_node) {
	141	struct dma_chan *chan;
	142
	143	chan = dma_request_slave_channel(rtd->cpu_dai->dev,
	144	dma_data->filter_data);
	145	ret = snd_dmaengine_pcm_open(substream, chan);
	146	} else {
	147	ret = snd_dmaengine_pcm_open_request_chan(substream,
	148	omap_dma_filter_fn,
	149	dma_data->filter_data);
	150	}
	151	return ret;
2e74796a JN	152	}
2e74796a JN	153
2e74796a JN	154	static int omap_pcm_mmap(struct snd_pcm_substream *substream,
	155	struct vm_area_struct *vma)
	156	{
	157	struct snd_pcm_runtime *runtime = substream->runtime;
	158
	159	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
	160	runtime->dma_area,
	161	runtime->dma_addr,
	162	runtime->dma_bytes);
	163	}
	164
b2a19d02	165	static struct snd_pcm_ops omap_pcm_ops = {
2e74796a	166	.open = omap_pcm_open,
7c1c1d4a	167	.close = snd_dmaengine_pcm_close_release_chan,
2e74796a JN	168	.ioctl = snd_pcm_lib_ioctl,
	169	.hw_params = omap_pcm_hw_params,
	170	.hw_free = omap_pcm_hw_free,
abe99370	171	.trigger = snd_dmaengine_pcm_trigger,
2e74796a JN	172	.pointer = omap_pcm_pointer,
	173	.mmap = omap_pcm_mmap,
	174	};
	175
2e74796a JN	176	static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
	177	int stream)
	178	{
	179	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	180	struct snd_dma_buffer *buf = &substream->dma_buffer;
	181	size_t size = omap_pcm_hardware.buffer_bytes_max;
	182
	183	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	184	buf->dev.dev = pcm->card->dev;
	185	buf->private_data = NULL;
	186	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
	187	&buf->addr, GFP_KERNEL);
	188	if (!buf->area)
	189	return -ENOMEM;
	190
	191	buf->bytes = size;
	192	return 0;
	193	}
	194
	195	static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
	196	{
	197	struct snd_pcm_substream *substream;
	198	struct snd_dma_buffer *buf;
	199	int stream;
	200
	201	for (stream = 0; stream < 2; stream++) {
	202	substream = pcm->streams[stream].substream;
	203	if (!substream)
	204	continue;
	205
	206	buf = &substream->dma_buffer;
	207	if (!buf->area)
	208	continue;
	209
	210	dma_free_writecombine(pcm->card->dev, buf->bytes,
	211	buf->area, buf->addr);
	212	buf->area = NULL;
	213	}
	214	}
	215
552d1ef6	216	static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
2e74796a	217	{
552d1ef6	218	struct snd_card *card = rtd->card->snd_card;
552d1ef6	219	struct snd_pcm *pcm = rtd->pcm;
c9bd5e69	220	int ret;
2e74796a	221
d51199a8	222	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
c9bd5e69 RK	223	if (ret)
c9bd5e69 RK	224	return ret;
2e74796a	225
25e9e756	226	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
2e74796a JN	227	ret = omap_pcm_preallocate_dma_buffer(pcm,
	228	SNDRV_PCM_STREAM_PLAYBACK);
	229	if (ret)
	230	goto out;
	231	}
	232
25e9e756	233	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
2e74796a JN	234	ret = omap_pcm_preallocate_dma_buffer(pcm,
	235	SNDRV_PCM_STREAM_CAPTURE);
	236	if (ret)
	237	goto out;
	238	}
	239
	240	out:
fad9365b OM	241	/* free preallocated buffers in case of error */
	242	if (ret)
	243	omap_pcm_free_dma_buffers(pcm);
	244
2e74796a JN	245	return ret;
	246	}
	247
f0fba2ad LG	248	static struct snd_soc_platform_driver omap_soc_platform = {
f0fba2ad LG	249	.ops = &omap_pcm_ops,
2e74796a JN	250	.pcm_new = omap_pcm_new,
	251	.pcm_free = omap_pcm_free_dma_buffers,
	252	};
2e74796a	253
fe7b5868 PU	254	int omap_pcm_platform_register(struct device *dev)
fe7b5868 PU	255	{
6742e15c	256	omap_pcm_limit_supported_formats();
fe7b5868 PU	257	return devm_snd_soc_register_platform(dev, &omap_soc_platform);
	258	}
	259	EXPORT_SYMBOL_GPL(omap_pcm_platform_register);
	260
7ec41ee5	261	MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
2e74796a JN	262	MODULE_DESCRIPTION("OMAP PCM DMA module");
2e74796a JN	263	MODULE_LICENSE("GPL");