[mirror_ubuntu-bionic-kernel.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 <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

#include <plat/cpu.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 |
				  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,
};

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 if (!substream->runtime->no_period_wakeup)
		omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ);
	else {
		/*
		 * No period wakeup:
		 * we need to disable BLOCK_IRQ, which is enabled by the omap
		 * dma core at request dma time.
		 */
		omap_disable_dma_irq(prtd->dma_ch, OMAP_DMA_BLOCK_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_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 __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),
};

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>
2e74796a JN	28	#include <sound/core.h>
	29	#include <sound/pcm.h>
	30	#include <sound/pcm_params.h>
	31	#include <sound/soc.h>
	32
7d7e1eba	33	#include <plat/cpu.h>
ce491cf8	34	#include <plat/dma.h>
2e74796a JN	35	#include "omap-pcm.h"
	36
	37	static const struct snd_pcm_hardware omap_pcm_hardware = {
	38	.info = SNDRV_PCM_INFO_MMAP \|
	39	SNDRV_PCM_INFO_MMAP_VALID \|
	40	SNDRV_PCM_INFO_INTERLEAVED \|
	41	SNDRV_PCM_INFO_PAUSE \|
b4173824 PU	42	SNDRV_PCM_INFO_RESUME \|
b4173824 PU	43	SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
e17dd32f MLC	44	.formats = SNDRV_PCM_FMTBIT_S16_LE \|
e17dd32f MLC	45	SNDRV_PCM_FMTBIT_S32_LE,
2e74796a JN	46	.period_bytes_min = 32,
	47	.period_bytes_max = 64 * 1024,
	48	.periods_min = 2,
	49	.periods_max = 255,
	50	.buffer_bytes_max = 128 * 1024,
	51	};
	52
	53	struct omap_runtime_data {
	54	spinlock_t lock;
	55	struct omap_pcm_dma_data *dma_data;
	56	int dma_ch;
	57	int period_index;
	58	};
	59
	60	static void omap_pcm_dma_irq(int ch, u16 stat, void *data)
	61	{
	62	struct snd_pcm_substream *substream = data;
	63	struct snd_pcm_runtime *runtime = substream->runtime;
	64	struct omap_runtime_data *prtd = runtime->private_data;
	65	unsigned long flags;
	66
b5442a75	67	if ((cpu_is_omap1510())) {
2e74796a	68	/*
64844a6a JK	69	* OMAP1510 doesn't fully support DMA progress counter
64844a6a JK	70	* and there is no software emulation implemented yet,
b5442a75	71	* so have to maintain our own progress counters
64844a6a	72	* that can be used by omap_pcm_pointer() instead.
2e74796a JN	73	*/
2e74796a JN	74	spin_lock_irqsave(&prtd->lock, flags);
471e3dec JK	75	if ((stat == OMAP_DMA_LAST_IRQ) &&
	76	(prtd->period_index == runtime->periods - 1)) {
	77	/* we are in sync, do nothing */
	78	spin_unlock_irqrestore(&prtd->lock, flags);
	79	return;
	80	}
2e74796a	81	if (prtd->period_index >= 0) {
471e3dec JK	82	if (stat & OMAP_DMA_BLOCK_IRQ) {
	83	/* end of buffer reached, loop back */
	84	prtd->period_index = 0;
	85	} else if (stat & OMAP_DMA_LAST_IRQ) {
	86	/* update the counter for the last period */
	87	prtd->period_index = runtime->periods - 1;
	88	} else if (++prtd->period_index >= runtime->periods) {
	89	/* end of buffer missed? loop back */
2e74796a	90	prtd->period_index = 0;
2e74796a JN	91	}
	92	}
	93	spin_unlock_irqrestore(&prtd->lock, flags);
	94	}
	95
	96	snd_pcm_period_elapsed(substream);
	97	}
	98
	99	/* this may get called several times by oss emulation */
	100	static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
	101	struct snd_pcm_hw_params *params)
	102	{
	103	struct snd_pcm_runtime *runtime = substream->runtime;
	104	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	105	struct omap_runtime_data *prtd = runtime->private_data;
5f712b2b	106	struct omap_pcm_dma_data *dma_data;
f0fba2ad	107
2e74796a JN	108	int err = 0;
2e74796a JN	109
f0fba2ad	110	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
5f712b2b	111
1b4246a1 JS	112	/* return if this is a bufferless transfer e.g.
1b4246a1 JS	113	* codec <--> BT codec or GSM modem -- lg FIXME */
2e74796a	114	if (!dma_data)
1b4246a1	115	return 0;
2e74796a JN	116
	117	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	118	runtime->dma_bytes = params_buffer_bytes(params);
	119
	120	if (prtd->dma_data)
	121	return 0;
	122	prtd->dma_data = dma_data;
	123	err = omap_request_dma(dma_data->dma_req, dma_data->name,
	124	omap_pcm_dma_irq, substream, &prtd->dma_ch);
64844a6a	125	if (!err) {
2e74796a JN	126	/*
	127	* Link channel with itself so DMA doesn't need any
	128	* reprogramming while looping the buffer
	129	*/
	130	omap_dma_link_lch(prtd->dma_ch, prtd->dma_ch);
	131	}
	132
	133	return err;
	134	}
	135
	136	static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
	137	{
	138	struct snd_pcm_runtime *runtime = substream->runtime;
	139	struct omap_runtime_data *prtd = runtime->private_data;
	140
	141	if (prtd->dma_data == NULL)
	142	return 0;
	143
64844a6a	144	omap_dma_unlink_lch(prtd->dma_ch, prtd->dma_ch);
2e74796a JN	145	omap_free_dma(prtd->dma_ch);
	146	prtd->dma_data = NULL;
	147
	148	snd_pcm_set_runtime_buffer(substream, NULL);
	149
	150	return 0;
	151	}
	152
	153	static int omap_pcm_prepare(struct snd_pcm_substream *substream)
	154	{
	155	struct snd_pcm_runtime *runtime = substream->runtime;
	156	struct omap_runtime_data *prtd = runtime->private_data;
	157	struct omap_pcm_dma_data *dma_data = prtd->dma_data;
	158	struct omap_dma_channel_params dma_params;
e17dd32f	159	int bytes;
2e74796a	160
1b4246a1 JS	161	/* return if this is a bufferless transfer e.g.
	162	* codec <--> BT codec or GSM modem -- lg FIXME */
	163	if (!prtd->dma_data)
	164	return 0;
	165
2e74796a	166	memset(&dma_params, 0, sizeof(dma_params));
e17dd32f	167	dma_params.data_type = dma_data->data_type;
2e74796a	168	dma_params.trigger = dma_data->dma_req;
caebc0cb	169	dma_params.sync_mode = dma_data->sync_mode;
2e74796a JN	170	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	171	dma_params.src_amode = OMAP_DMA_AMODE_POST_INC;
	172	dma_params.dst_amode = OMAP_DMA_AMODE_CONSTANT;
	173	dma_params.src_or_dst_synch = OMAP_DMA_DST_SYNC;
	174	dma_params.src_start = runtime->dma_addr;
	175	dma_params.dst_start = dma_data->port_addr;
9d37484c	176	dma_params.dst_port = OMAP_DMA_PORT_MPUI;
e17dd32f	177	dma_params.dst_fi = dma_data->packet_size;
2e74796a JN	178	} else {
	179	dma_params.src_amode = OMAP_DMA_AMODE_CONSTANT;
	180	dma_params.dst_amode = OMAP_DMA_AMODE_POST_INC;
	181	dma_params.src_or_dst_synch = OMAP_DMA_SRC_SYNC;
	182	dma_params.src_start = dma_data->port_addr;
	183	dma_params.dst_start = runtime->dma_addr;
9d37484c	184	dma_params.src_port = OMAP_DMA_PORT_MPUI;
e17dd32f	185	dma_params.src_fi = dma_data->packet_size;
2e74796a JN	186	}
	187	/*
	188	* Set DMA transfer frame size equal to ALSA period size and frame
	189	* count as no. of ALSA periods. Then with DMA frame interrupt enabled,
	190	* we can transfer the whole ALSA buffer with single DMA transfer but
	191	* still can get an interrupt at each period bounary
	192	*/
e17dd32f MLC	193	bytes = snd_pcm_lib_period_bytes(substream);
e17dd32f MLC	194	dma_params.elem_count = bytes >> dma_data->data_type;
2e74796a JN	195	dma_params.frame_count = runtime->periods;
	196	omap_set_dma_params(prtd->dma_ch, &dma_params);
	197
b5442a75	198	if ((cpu_is_omap1510()))
471e3dec JK	199	omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ \|
471e3dec JK	200	OMAP_DMA_LAST_IRQ \| OMAP_DMA_BLOCK_IRQ);
b4173824	201	else if (!substream->runtime->no_period_wakeup)
471e3dec	202	omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ);
b1b6cffe PU	203	else {
	204	/*
	205	* No period wakeup:
	206	* we need to disable BLOCK_IRQ, which is enabled by the omap
	207	* dma core at request dma time.
	208	*/
	209	omap_disable_dma_irq(prtd->dma_ch, OMAP_DMA_BLOCK_IRQ);
	210	}
2e74796a	211
4d187fb8 JK	212	if (!(cpu_class_is_omap1())) {
	213	omap_set_dma_src_burst_mode(prtd->dma_ch,
	214	OMAP_DMA_DATA_BURST_16);
	215	omap_set_dma_dest_burst_mode(prtd->dma_ch,
	216	OMAP_DMA_DATA_BURST_16);
	217	}
9599d485	218
2e74796a JN	219	return 0;
	220	}
	221
	222	static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	223	{
	224	struct snd_pcm_runtime *runtime = substream->runtime;
	225	struct omap_runtime_data *prtd = runtime->private_data;
caebc0cb	226	struct omap_pcm_dma_data *dma_data = prtd->dma_data;
21dff434	227	unsigned long flags;
2e74796a JN	228	int ret = 0;
2e74796a JN	229
21dff434	230	spin_lock_irqsave(&prtd->lock, flags);
2e74796a JN	231	switch (cmd) {
	232	case SNDRV_PCM_TRIGGER_START:
	233	case SNDRV_PCM_TRIGGER_RESUME:
	234	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	235	prtd->period_index = 0;
caebc0cb EV	236	/* Configure McBSP internal buffer usage */
	237	if (dma_data->set_threshold)
	238	dma_data->set_threshold(substream);
	239
2e74796a JN	240	omap_start_dma(prtd->dma_ch);
	241	break;
	242
	243	case SNDRV_PCM_TRIGGER_STOP:
	244	case SNDRV_PCM_TRIGGER_SUSPEND:
	245	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	246	prtd->period_index = -1;
	247	omap_stop_dma(prtd->dma_ch);
	248	break;
	249	default:
	250	ret = -EINVAL;
	251	}
21dff434	252	spin_unlock_irqrestore(&prtd->lock, flags);
2e74796a JN	253
	254	return ret;
	255	}
	256
	257	static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
	258	{
	259	struct snd_pcm_runtime *runtime = substream->runtime;
	260	struct omap_runtime_data *prtd = runtime->private_data;
	261	dma_addr_t ptr;
	262	snd_pcm_uframes_t offset;
	263
b5442a75 JK	264	if (cpu_is_omap1510()) {
	265	offset = prtd->period_index * runtime->period_size;
	266	} else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
2e74796a	267	ptr = omap_get_dma_dst_pos(prtd->dma_ch);
1bdd7419	268	offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
b5442a75	269	} else {
1bdd7419 JK	270	ptr = omap_get_dma_src_pos(prtd->dma_ch);
1bdd7419 JK	271	offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
b5442a75	272	}
2e74796a	273
2e74796a JN	274	if (offset >= runtime->buffer_size)
	275	offset = 0;
	276
	277	return offset;
	278	}
	279
	280	static int omap_pcm_open(struct snd_pcm_substream *substream)
	281	{
	282	struct snd_pcm_runtime *runtime = substream->runtime;
	283	struct omap_runtime_data *prtd;
	284	int ret;
	285
	286	snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
	287
	288	/* Ensure that buffer size is a multiple of period size */
	289	ret = snd_pcm_hw_constraint_integer(runtime,
	290	SNDRV_PCM_HW_PARAM_PERIODS);
	291	if (ret < 0)
	292	goto out;
	293
19b3f316	294	prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
2e74796a JN	295	if (prtd == NULL) {
	296	ret = -ENOMEM;
	297	goto out;
	298	}
	299	spin_lock_init(&prtd->lock);
	300	runtime->private_data = prtd;
	301
	302	out:
	303	return ret;
	304	}
	305
	306	static int omap_pcm_close(struct snd_pcm_substream *substream)
	307	{
	308	struct snd_pcm_runtime *runtime = substream->runtime;
	309
	310	kfree(runtime->private_data);
	311	return 0;
	312	}
	313
	314	static int omap_pcm_mmap(struct snd_pcm_substream *substream,
	315	struct vm_area_struct *vma)
	316	{
	317	struct snd_pcm_runtime *runtime = substream->runtime;
	318
	319	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
	320	runtime->dma_area,
	321	runtime->dma_addr,
	322	runtime->dma_bytes);
	323	}
	324
b2a19d02	325	static struct snd_pcm_ops omap_pcm_ops = {
2e74796a JN	326	.open = omap_pcm_open,
	327	.close = omap_pcm_close,
	328	.ioctl = snd_pcm_lib_ioctl,
	329	.hw_params = omap_pcm_hw_params,
	330	.hw_free = omap_pcm_hw_free,
	331	.prepare = omap_pcm_prepare,
	332	.trigger = omap_pcm_trigger,
	333	.pointer = omap_pcm_pointer,
	334	.mmap = omap_pcm_mmap,
	335	};
	336
a152ff24	337	static u64 omap_pcm_dmamask = DMA_BIT_MASK(64);
2e74796a JN	338
	339	static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
	340	int stream)
	341	{
	342	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	343	struct snd_dma_buffer *buf = &substream->dma_buffer;
	344	size_t size = omap_pcm_hardware.buffer_bytes_max;
	345
	346	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	347	buf->dev.dev = pcm->card->dev;
	348	buf->private_data = NULL;
	349	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
	350	&buf->addr, GFP_KERNEL);
	351	if (!buf->area)
	352	return -ENOMEM;
	353
	354	buf->bytes = size;
	355	return 0;
	356	}
	357
	358	static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
	359	{
	360	struct snd_pcm_substream *substream;
	361	struct snd_dma_buffer *buf;
	362	int stream;
	363
	364	for (stream = 0; stream < 2; stream++) {
	365	substream = pcm->streams[stream].substream;
	366	if (!substream)
	367	continue;
	368
	369	buf = &substream->dma_buffer;
	370	if (!buf->area)
	371	continue;
	372
	373	dma_free_writecombine(pcm->card->dev, buf->bytes,
	374	buf->area, buf->addr);
	375	buf->area = NULL;
	376	}
	377	}
	378
552d1ef6	379	static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
2e74796a	380	{
552d1ef6	381	struct snd_card *card = rtd->card->snd_card;
552d1ef6	382	struct snd_pcm *pcm = rtd->pcm;
2e74796a JN	383	int ret = 0;
	384
	385	if (!card->dev->dma_mask)
	386	card->dev->dma_mask = &omap_pcm_dmamask;
	387	if (!card->dev->coherent_dma_mask)
a152ff24	388	card->dev->coherent_dma_mask = DMA_BIT_MASK(64);
2e74796a	389
25e9e756	390	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
2e74796a JN	391	ret = omap_pcm_preallocate_dma_buffer(pcm,
	392	SNDRV_PCM_STREAM_PLAYBACK);
	393	if (ret)
	394	goto out;
	395	}
	396
25e9e756	397	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
2e74796a JN	398	ret = omap_pcm_preallocate_dma_buffer(pcm,
	399	SNDRV_PCM_STREAM_CAPTURE);
	400	if (ret)
	401	goto out;
	402	}
	403
	404	out:
fad9365b OM	405	/* free preallocated buffers in case of error */
	406	if (ret)
	407	omap_pcm_free_dma_buffers(pcm);
	408
2e74796a JN	409	return ret;
	410	}
	411
f0fba2ad LG	412	static struct snd_soc_platform_driver omap_soc_platform = {
f0fba2ad LG	413	.ops = &omap_pcm_ops,
2e74796a JN	414	.pcm_new = omap_pcm_new,
	415	.pcm_free = omap_pcm_free_dma_buffers,
	416	};
2e74796a	417
f0fba2ad LG	418	static __devinit int omap_pcm_probe(struct platform_device *pdev)
	419	{
	420	return snd_soc_register_platform(&pdev->dev,
	421	&omap_soc_platform);
	422	}
	423
	424	static int __devexit omap_pcm_remove(struct platform_device *pdev)
	425	{
	426	snd_soc_unregister_platform(&pdev->dev);
	427	return 0;
	428	}
	429
	430	static struct platform_driver omap_pcm_driver = {
	431	.driver = {
	432	.name = "omap-pcm-audio",
	433	.owner = THIS_MODULE,
	434	},
	435
	436	.probe = omap_pcm_probe,
	437	.remove = __devexit_p(omap_pcm_remove),
	438	};
	439
beda5bf5	440	module_platform_driver(omap_pcm_driver);
958e792c	441
7ec41ee5	442	MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
2e74796a JN	443	MODULE_DESCRIPTION("OMAP PCM DMA module");
2e74796a JN	444	MODULE_LICENSE("GPL");
5e70b7fc	445	MODULE_ALIAS("platform:omap-pcm-audio");