[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 "omap-pcm.h"

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

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 |
				  SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
	.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,
};

static int omap_pcm_get_dma_buswidth(int num_bits)
{
	int buswidth;

	switch (num_bits) {
	case 16:
		buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
		break;
	case 32:
		buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
		break;
	default:
		buswidth = -EINVAL;
		break;
	}
	return buswidth;
}


/* 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;

	/* Override the *_dma addr_width if requested by the DAI driver */
	if (dma_data->data_type) {
		int buswidth = omap_pcm_get_dma_buswidth(dma_data->data_type);

		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
			config.dst_addr_width = buswidth;
		else
			config.src_addr_width = buswidth;
	}

	config.src_addr = dma_data->port_addr;
	config.dst_addr = dma_data->port_addr;
	config.src_maxburst = dma_data->packet_size;
	config.dst_maxburst = dma_data->packet_size;

	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 omap_pcm_dma_data *dma_data;

	snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);

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

	return snd_dmaengine_pcm_open(substream, omap_dma_filter_fn,
				      &dma_data->dma_req);
}

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,
	.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 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_soc_pcm_runtime *rtd)
{
	struct snd_card *card = rtd->card->snd_card;
	struct snd_pcm *pcm = rtd->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 (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,
};

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

static int 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 = omap_pcm_remove,
};

module_platform_driver(omap_pcm_driver);

MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
MODULE_DESCRIPTION("OMAP PCM DMA module");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:omap-pcm-audio");
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 JN	33	#include <sound/soc.h>
2e74796a JN	34
2e74796a JN	35	#include "omap-pcm.h"
2e74796a JN	36
27615a97 TL	37	#ifdef CONFIG_ARCH_OMAP1
	38	#define pcm_omap1510() cpu_is_omap1510()
	39	#else
	40	#define pcm_omap1510() 0
	41	#endif
	42
2e74796a JN	43	static const struct snd_pcm_hardware omap_pcm_hardware = {
	44	.info = SNDRV_PCM_INFO_MMAP \|
	45	SNDRV_PCM_INFO_MMAP_VALID \|
	46	SNDRV_PCM_INFO_INTERLEAVED \|
	47	SNDRV_PCM_INFO_PAUSE \|
b4173824 PU	48	SNDRV_PCM_INFO_RESUME \|
b4173824 PU	49	SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
e17dd32f MLC	50	.formats = SNDRV_PCM_FMTBIT_S16_LE \|
e17dd32f MLC	51	SNDRV_PCM_FMTBIT_S32_LE,
2e74796a JN	52	.period_bytes_min = 32,
	53	.period_bytes_max = 64 * 1024,
	54	.periods_min = 2,
	55	.periods_max = 255,
	56	.buffer_bytes_max = 128 * 1024,
	57	};
	58
946cc36a	59	static int omap_pcm_get_dma_buswidth(int num_bits)
2e74796a	60	{
946cc36a	61	int buswidth;
2e74796a	62
946cc36a PU	63	switch (num_bits) {
	64	case 16:
	65	buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
	66	break;
	67	case 32:
	68	buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
	69	break;
	70	default:
	71	buswidth = -EINVAL;
	72	break;
	73	}
	74	return buswidth;
2e74796a JN	75	}
2e74796a JN	76
946cc36a	77
2e74796a JN	78	/* this may get called several times by oss emulation */
	79	static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
	80	struct snd_pcm_hw_params *params)
	81	{
	82	struct snd_pcm_runtime *runtime = substream->runtime;
	83	struct snd_soc_pcm_runtime *rtd = substream->private_data;
5f712b2b	84	struct omap_pcm_dma_data *dma_data;
946cc36a PU	85	struct dma_slave_config config;
946cc36a PU	86	struct dma_chan *chan;
2e74796a JN	87	int err = 0;
2e74796a JN	88
f0fba2ad	89	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
5f712b2b	90
1b4246a1 JS	91	/* return if this is a bufferless transfer e.g.
1b4246a1 JS	92	* codec <--> BT codec or GSM modem -- lg FIXME */
2e74796a	93	if (!dma_data)
1b4246a1	94	return 0;
2e74796a JN	95
	96	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	97	runtime->dma_bytes = params_buffer_bytes(params);
	98
946cc36a PU	99	chan = snd_dmaengine_pcm_get_chan(substream);
	100	if (!chan)
	101	return -EINVAL;
2e74796a	102
946cc36a PU	103	/* fills in addr_width and direction */
	104	err = snd_hwparams_to_dma_slave_config(substream, params, &config);
	105	if (err)
	106	return err;
2e74796a	107
946cc36a PU	108	/* Override the _dma addr_width if requested by the DAI driver /
	109	if (dma_data->data_type) {
	110	int buswidth = omap_pcm_get_dma_buswidth(dma_data->data_type);
2e74796a	111
946cc36a PU	112	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	113	config.dst_addr_width = buswidth;
	114	else
	115	config.src_addr_width = buswidth;
	116	}
2e74796a	117
946cc36a PU	118	config.src_addr = dma_data->port_addr;
	119	config.dst_addr = dma_data->port_addr;
	120	config.src_maxburst = dma_data->packet_size;
	121	config.dst_maxburst = dma_data->packet_size;
2e74796a	122
946cc36a	123	return dmaengine_slave_config(chan, &config);
2e74796a JN	124	}
2e74796a JN	125
946cc36a	126	static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
2e74796a	127	{
946cc36a	128	snd_pcm_set_runtime_buffer(substream, NULL);
2e74796a JN	129	return 0;
	130	}
	131
2e74796a JN	132	static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
2e74796a JN	133	{
2e74796a JN	134	snd_pcm_uframes_t offset;
2e74796a JN	135
27615a97	136	if (pcm_omap1510())
946cc36a PU	137	offset = snd_dmaengine_pcm_pointer_no_residue(substream);
	138	else
	139	offset = snd_dmaengine_pcm_pointer(substream);
2e74796a JN	140
	141	return offset;
	142	}
	143
	144	static int omap_pcm_open(struct snd_pcm_substream *substream)
	145	{
946cc36a PU	146	struct snd_soc_pcm_runtime *rtd = substream->private_data;
946cc36a PU	147	struct omap_pcm_dma_data *dma_data;
2e74796a JN	148
	149	snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
	150
946cc36a	151	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
a92b5317 PU	152
	153	return snd_dmaengine_pcm_open(substream, omap_dma_filter_fn,
	154	&dma_data->dma_req);
2e74796a JN	155	}
2e74796a JN	156
2e74796a JN	157	static int omap_pcm_mmap(struct snd_pcm_substream *substream,
	158	struct vm_area_struct *vma)
	159	{
	160	struct snd_pcm_runtime *runtime = substream->runtime;
	161
	162	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
	163	runtime->dma_area,
	164	runtime->dma_addr,
	165	runtime->dma_bytes);
	166	}
	167
b2a19d02	168	static struct snd_pcm_ops omap_pcm_ops = {
2e74796a	169	.open = omap_pcm_open,
340af748	170	.close = snd_dmaengine_pcm_close,
2e74796a JN	171	.ioctl = snd_pcm_lib_ioctl,
	172	.hw_params = omap_pcm_hw_params,
	173	.hw_free = omap_pcm_hw_free,
abe99370	174	.trigger = snd_dmaengine_pcm_trigger,
2e74796a JN	175	.pointer = omap_pcm_pointer,
	176	.mmap = omap_pcm_mmap,
	177	};
	178
a152ff24	179	static u64 omap_pcm_dmamask = DMA_BIT_MASK(64);
2e74796a JN	180
	181	static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
	182	int stream)
	183	{
	184	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	185	struct snd_dma_buffer *buf = &substream->dma_buffer;
	186	size_t size = omap_pcm_hardware.buffer_bytes_max;
	187
	188	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	189	buf->dev.dev = pcm->card->dev;
	190	buf->private_data = NULL;
	191	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
	192	&buf->addr, GFP_KERNEL);
	193	if (!buf->area)
	194	return -ENOMEM;
	195
	196	buf->bytes = size;
	197	return 0;
	198	}
	199
	200	static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
	201	{
	202	struct snd_pcm_substream *substream;
	203	struct snd_dma_buffer *buf;
	204	int stream;
	205
	206	for (stream = 0; stream < 2; stream++) {
	207	substream = pcm->streams[stream].substream;
	208	if (!substream)
	209	continue;
	210
	211	buf = &substream->dma_buffer;
	212	if (!buf->area)
	213	continue;
	214
	215	dma_free_writecombine(pcm->card->dev, buf->bytes,
	216	buf->area, buf->addr);
	217	buf->area = NULL;
	218	}
	219	}
	220
552d1ef6	221	static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
2e74796a	222	{
552d1ef6	223	struct snd_card *card = rtd->card->snd_card;
552d1ef6	224	struct snd_pcm *pcm = rtd->pcm;
2e74796a JN	225	int ret = 0;
	226
	227	if (!card->dev->dma_mask)
	228	card->dev->dma_mask = &omap_pcm_dmamask;
	229	if (!card->dev->coherent_dma_mask)
a152ff24	230	card->dev->coherent_dma_mask = DMA_BIT_MASK(64);
2e74796a	231
25e9e756	232	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
2e74796a JN	233	ret = omap_pcm_preallocate_dma_buffer(pcm,
	234	SNDRV_PCM_STREAM_PLAYBACK);
	235	if (ret)
	236	goto out;
	237	}
	238
25e9e756	239	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
2e74796a JN	240	ret = omap_pcm_preallocate_dma_buffer(pcm,
	241	SNDRV_PCM_STREAM_CAPTURE);
	242	if (ret)
	243	goto out;
	244	}
	245
	246	out:
fad9365b OM	247	/* free preallocated buffers in case of error */
	248	if (ret)
	249	omap_pcm_free_dma_buffers(pcm);
	250
2e74796a JN	251	return ret;
	252	}
	253
f0fba2ad LG	254	static struct snd_soc_platform_driver omap_soc_platform = {
f0fba2ad LG	255	.ops = &omap_pcm_ops,
2e74796a JN	256	.pcm_new = omap_pcm_new,
	257	.pcm_free = omap_pcm_free_dma_buffers,
	258	};
2e74796a	259
7ff60006	260	static int omap_pcm_probe(struct platform_device *pdev)
f0fba2ad LG	261	{
	262	return snd_soc_register_platform(&pdev->dev,
	263	&omap_soc_platform);
	264	}
	265
7ff60006	266	static int omap_pcm_remove(struct platform_device *pdev)
f0fba2ad LG	267	{
	268	snd_soc_unregister_platform(&pdev->dev);
	269	return 0;
	270	}
	271
	272	static struct platform_driver omap_pcm_driver = {
	273	.driver = {
	274	.name = "omap-pcm-audio",
	275	.owner = THIS_MODULE,
	276	},
	277
	278	.probe = omap_pcm_probe,
7ff60006	279	.remove = omap_pcm_remove,
f0fba2ad LG	280	};
f0fba2ad LG	281
beda5bf5	282	module_platform_driver(omap_pcm_driver);
958e792c	283
7ec41ee5	284	MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
2e74796a JN	285	MODULE_DESCRIPTION("OMAP PCM DMA module");
2e74796a JN	286	MODULE_LICENSE("GPL");
5e70b7fc	287	MODULE_ALIAS("platform:omap-pcm-audio");