[deliverable/linux.git] / sound / soc / samsung / dma.c

/*
 * dma.c  --  ALSA Soc Audio Layer
 *
 * (c) 2006 Wolfson Microelectronics PLC.
 * Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
 *
 * Copyright 2004-2005 Simtec Electronics
 *	http://armlinux.simtec.co.uk/
 *	Ben Dooks <ben@simtec.co.uk>
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 */

#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/module.h>

#include <sound/soc.h>
#include <sound/pcm_params.h>

#include <asm/dma.h>
#include <mach/hardware.h>
#include <mach/dma.h>

#include "dma.h"

#define ST_RUNNING		(1<<0)
#define ST_OPENED		(1<<1)

static const struct snd_pcm_hardware dma_hardware = {
	.info			= SNDRV_PCM_INFO_INTERLEAVED |
				    SNDRV_PCM_INFO_BLOCK_TRANSFER |
				    SNDRV_PCM_INFO_MMAP |
				    SNDRV_PCM_INFO_MMAP_VALID |
				    SNDRV_PCM_INFO_PAUSE |
				    SNDRV_PCM_INFO_RESUME,
	.formats		= SNDRV_PCM_FMTBIT_S16_LE |
				    SNDRV_PCM_FMTBIT_U16_LE |
				    SNDRV_PCM_FMTBIT_U8 |
				    SNDRV_PCM_FMTBIT_S8,
	.channels_min		= 2,
	.channels_max		= 2,
	.buffer_bytes_max	= 128*1024,
	.period_bytes_min	= PAGE_SIZE,
	.period_bytes_max	= PAGE_SIZE*2,
	.periods_min		= 2,
	.periods_max		= 128,
	.fifo_size		= 32,
};

struct runtime_data {
	spinlock_t lock;
	int state;
	unsigned int dma_loaded;
	unsigned int dma_period;
	dma_addr_t dma_start;
	dma_addr_t dma_pos;
	dma_addr_t dma_end;
	struct s3c_dma_params *params;
};

static void audio_buffdone(void *data);

/* dma_enqueue
 *
 * place a dma buffer onto the queue for the dma system
 * to handle.
 */
static void dma_enqueue(struct snd_pcm_substream *substream)
{
	struct runtime_data *prtd = substream->runtime->private_data;
	dma_addr_t pos = prtd->dma_pos;
	unsigned int limit;
	struct samsung_dma_prep_info dma_info;

	pr_debug("Entered %s\n", __func__);

	limit = (prtd->dma_end - prtd->dma_start) / prtd->dma_period;

	pr_debug("%s: loaded %d, limit %d\n",
				__func__, prtd->dma_loaded, limit);

	dma_info.cap = (samsung_dma_has_circular() ? DMA_CYCLIC : DMA_SLAVE);
	dma_info.direction =
		(substream->stream == SNDRV_PCM_STREAM_PLAYBACK
		? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM);
	dma_info.fp = audio_buffdone;
	dma_info.fp_param = substream;
	dma_info.period = prtd->dma_period;
	dma_info.len = prtd->dma_period*limit;

	while (prtd->dma_loaded < limit) {
		pr_debug("dma_loaded: %d\n", prtd->dma_loaded);

		if ((pos + dma_info.period) > prtd->dma_end) {
			dma_info.period  = prtd->dma_end - pos;
			pr_debug("%s: corrected dma len %ld\n",
					__func__, dma_info.period);
		}

		dma_info.buf = pos;
		prtd->params->ops->prepare(prtd->params->ch, &dma_info);

		prtd->dma_loaded++;
		pos += prtd->dma_period;
		if (pos >= prtd->dma_end)
			pos = prtd->dma_start;
	}

	prtd->dma_pos = pos;
}

static void audio_buffdone(void *data)
{
	struct snd_pcm_substream *substream = data;
	struct runtime_data *prtd = substream->runtime->private_data;

	pr_debug("Entered %s\n", __func__);

	if (prtd->state & ST_RUNNING) {
		prtd->dma_pos += prtd->dma_period;
		if (prtd->dma_pos >= prtd->dma_end)
			prtd->dma_pos = prtd->dma_start;

		if (substream)
			snd_pcm_period_elapsed(substream);

		spin_lock(&prtd->lock);
		if (!samsung_dma_has_circular()) {
			prtd->dma_loaded--;
			dma_enqueue(substream);
		}
		spin_unlock(&prtd->lock);
	}
}

static int dma_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct runtime_data *prtd = runtime->private_data;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	unsigned long totbytes = params_buffer_bytes(params);
	struct s3c_dma_params *dma =
		snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	struct samsung_dma_info dma_info;

	pr_debug("Entered %s\n", __func__);

	/* return if this is a bufferless transfer e.g.
	 * codec <--> BT codec or GSM modem -- lg FIXME */
	if (!dma)
		return 0;

	/* this may get called several times by oss emulation
	 * with different params -HW */
	if (prtd->params == NULL) {
		/* prepare DMA */
		prtd->params = dma;

		pr_debug("params %p, client %p, channel %d\n", prtd->params,
			prtd->params->client, prtd->params->channel);

		prtd->params->ops = samsung_dma_get_ops();

		dma_info.cap = (samsung_dma_has_circular() ?
			DMA_CYCLIC : DMA_SLAVE);
		dma_info.client = prtd->params->client;
		dma_info.direction =
			(substream->stream == SNDRV_PCM_STREAM_PLAYBACK
			? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM);
		dma_info.width = prtd->params->dma_size;
		dma_info.fifo = prtd->params->dma_addr;
		prtd->params->ch = prtd->params->ops->request(
				prtd->params->channel, &dma_info);
	}

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);

	runtime->dma_bytes = totbytes;

	spin_lock_irq(&prtd->lock);
	prtd->dma_loaded = 0;
	prtd->dma_period = params_period_bytes(params);
	prtd->dma_start = runtime->dma_addr;
	prtd->dma_pos = prtd->dma_start;
	prtd->dma_end = prtd->dma_start + totbytes;
	spin_unlock_irq(&prtd->lock);

	return 0;
}

static int dma_hw_free(struct snd_pcm_substream *substream)
{
	struct runtime_data *prtd = substream->runtime->private_data;

	pr_debug("Entered %s\n", __func__);

	snd_pcm_set_runtime_buffer(substream, NULL);

	if (prtd->params) {
		prtd->params->ops->flush(prtd->params->ch);
		prtd->params->ops->release(prtd->params->ch,
					prtd->params->client);
		prtd->params = NULL;
	}

	return 0;
}

static int dma_prepare(struct snd_pcm_substream *substream)
{
	struct runtime_data *prtd = substream->runtime->private_data;
	int ret = 0;

	pr_debug("Entered %s\n", __func__);

	/* return if this is a bufferless transfer e.g.
	 * codec <--> BT codec or GSM modem -- lg FIXME */
	if (!prtd->params)
		return 0;

	/* flush the DMA channel */
	prtd->params->ops->flush(prtd->params->ch);

	prtd->dma_loaded = 0;
	prtd->dma_pos = prtd->dma_start;

	/* enqueue dma buffers */
	dma_enqueue(substream);

	return ret;
}

static int dma_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct runtime_data *prtd = substream->runtime->private_data;
	int ret = 0;

	pr_debug("Entered %s\n", __func__);

	spin_lock(&prtd->lock);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		prtd->state |= ST_RUNNING;
		prtd->params->ops->trigger(prtd->params->ch);
		break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		prtd->state &= ~ST_RUNNING;
		prtd->params->ops->stop(prtd->params->ch);
		break;

	default:
		ret = -EINVAL;
		break;
	}

	spin_unlock(&prtd->lock);

	return ret;
}

static snd_pcm_uframes_t
dma_pointer(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct runtime_data *prtd = runtime->private_data;
	unsigned long res;

	pr_debug("Entered %s\n", __func__);

	res = prtd->dma_pos - prtd->dma_start;

	pr_debug("Pointer offset: %lu\n", res);

	/* we seem to be getting the odd error from the pcm library due
	 * to out-of-bounds pointers. this is maybe due to the dma engine
	 * not having loaded the new values for the channel before being
	 * called... (todo - fix )
	 */

	if (res >= snd_pcm_lib_buffer_bytes(substream)) {
		if (res == snd_pcm_lib_buffer_bytes(substream))
			res = 0;
	}

	return bytes_to_frames(substream->runtime, res);
}

static int dma_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct runtime_data *prtd;

	pr_debug("Entered %s\n", __func__);

	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
	snd_soc_set_runtime_hwparams(substream, &dma_hardware);

	prtd = kzalloc(sizeof(struct runtime_data), GFP_KERNEL);
	if (prtd == NULL)
		return -ENOMEM;

	spin_lock_init(&prtd->lock);

	runtime->private_data = prtd;
	return 0;
}

static int dma_close(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct runtime_data *prtd = runtime->private_data;

	pr_debug("Entered %s\n", __func__);

	if (!prtd)
		pr_debug("dma_close called with prtd == NULL\n");

	kfree(prtd);

	return 0;
}

static int dma_mmap(struct snd_pcm_substream *substream,
	struct vm_area_struct *vma)
{
	struct snd_pcm_runtime *runtime = substream->runtime;

	pr_debug("Entered %s\n", __func__);

	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
				     runtime->dma_area,
				     runtime->dma_addr,
				     runtime->dma_bytes);
}

static struct snd_pcm_ops dma_ops = {
	.open		= dma_open,
	.close		= dma_close,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= dma_hw_params,
	.hw_free	= dma_hw_free,
	.prepare	= dma_prepare,
	.trigger	= dma_trigger,
	.pointer	= dma_pointer,
	.mmap		= dma_mmap,
};

static int 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 = dma_hardware.buffer_bytes_max;

	pr_debug("Entered %s\n", __func__);

	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 dma_free_dma_buffers(struct snd_pcm *pcm)
{
	struct snd_pcm_substream *substream;
	struct snd_dma_buffer *buf;
	int stream;

	pr_debug("Entered %s\n", __func__);

	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 u64 dma_mask = DMA_BIT_MASK(32);

static int dma_new(struct snd_soc_pcm_runtime *rtd)
{
	struct snd_card *card = rtd->card->snd_card;
	struct snd_pcm *pcm = rtd->pcm;
	int ret = 0;

	pr_debug("Entered %s\n", __func__);

	if (!card->dev->dma_mask)
		card->dev->dma_mask = &dma_mask;
	if (!card->dev->coherent_dma_mask)
		card->dev->coherent_dma_mask = DMA_BIT_MASK(32);

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

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

static struct snd_soc_platform_driver samsung_asoc_platform = {
	.ops		= &dma_ops,
	.pcm_new	= dma_new,
	.pcm_free	= dma_free_dma_buffers,
};

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

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

static struct platform_driver asoc_dma_driver = {
	.driver = {
		.name = "samsung-audio",
		.owner = THIS_MODULE,
	},

	.probe = samsung_asoc_platform_probe,
	.remove = __devexit_p(samsung_asoc_platform_remove),
};

module_platform_driver(asoc_dma_driver);

MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
MODULE_DESCRIPTION("Samsung ASoC DMA Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:samsung-audio");
Commit	Line	Data
c0f41bb1	1	/*
4b640cf3	2	* dma.c -- ALSA Soc Audio Layer
c0f41bb1 BD	3	*
	4	* (c) 2006 Wolfson Microelectronics PLC.
	5	* Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
	6	*
c8efef17	7	* Copyright 2004-2005 Simtec Electronics
c0f41bb1 BD	8	* http://armlinux.simtec.co.uk/
	9	* Ben Dooks <ben@simtec.co.uk>
	10	*
	11	* This program is free software; you can redistribute it and/or modify it
	12	* under the terms of the GNU General Public License as published by the
	13	* Free Software Foundation; either version 2 of the License, or (at your
	14	* option) any later version.
c0f41bb1 BD	15	*/
c0f41bb1 BD	16
c0f41bb1 BD	17	#include <linux/slab.h>
c0f41bb1 BD	18	#include <linux/dma-mapping.h>
da155d5b	19	#include <linux/module.h>
c0f41bb1	20
c0f41bb1	21	#include <sound/soc.h>
0378b6ac	22	#include <sound/pcm_params.h>
c0f41bb1 BD	23
c0f41bb1 BD	24	#include <asm/dma.h>
a09e64fb RK	25	#include <mach/hardware.h>
a09e64fb RK	26	#include <mach/dma.h>
c0f41bb1	27
4b640cf3	28	#include "dma.h"
c0f41bb1	29
f7f74181 SY	30	#define ST_RUNNING (1<<0)
	31	#define ST_OPENED (1<<1)
	32
c3f2028b	33	static const struct snd_pcm_hardware dma_hardware = {
c0f41bb1 BD	34	.info = SNDRV_PCM_INFO_INTERLEAVED \|
	35	SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	36	SNDRV_PCM_INFO_MMAP \|
96d90e19 GG	37	SNDRV_PCM_INFO_MMAP_VALID \|
	38	SNDRV_PCM_INFO_PAUSE \|
	39	SNDRV_PCM_INFO_RESUME,
c0f41bb1 BD	40	.formats = SNDRV_PCM_FMTBIT_S16_LE \|
	41	SNDRV_PCM_FMTBIT_U16_LE \|
	42	SNDRV_PCM_FMTBIT_U8 \|
	43	SNDRV_PCM_FMTBIT_S8,
	44	.channels_min = 2,
	45	.channels_max = 2,
	46	.buffer_bytes_max = 128*1024,
	47	.period_bytes_min = PAGE_SIZE,
	48	.period_bytes_max = PAGE_SIZE*2,
	49	.periods_min = 2,
	50	.periods_max = 128,
	51	.fifo_size = 32,
	52	};
	53
c3f2028b	54	struct runtime_data {
c0f41bb1 BD	55	spinlock_t lock;
	56	int state;
	57	unsigned int dma_loaded;
c0f41bb1 BD	58	unsigned int dma_period;
	59	dma_addr_t dma_start;
	60	dma_addr_t dma_pos;
	61	dma_addr_t dma_end;
faa31776	62	struct s3c_dma_params *params;
c0f41bb1 BD	63	};
c0f41bb1 BD	64
344b4c48 BK	65	static void audio_buffdone(void *data);
344b4c48 BK	66
c3f2028b	67	/* dma_enqueue
c0f41bb1 BD	68	*
	69	* place a dma buffer onto the queue for the dma system
	70	* to handle.
344b4c48	71	*/
c3f2028b	72	static void dma_enqueue(struct snd_pcm_substream *substream)
c0f41bb1	73	{
c3f2028b	74	struct runtime_data *prtd = substream->runtime->private_data;
c0f41bb1	75	dma_addr_t pos = prtd->dma_pos;
e3d80248	76	unsigned int limit;
344b4c48	77	struct samsung_dma_prep_info dma_info;
c0f41bb1	78
ee7d4767	79	pr_debug("Entered %s\n", __func__);
c0f41bb1	80
344b4c48	81	limit = (prtd->dma_end - prtd->dma_start) / prtd->dma_period;
e3d80248	82
d3ff5a3e JB	83	pr_debug("%s: loaded %d, limit %d\n",
d3ff5a3e JB	84	__func__, prtd->dma_loaded, limit);
e3d80248	85
344b4c48 BK	86	dma_info.cap = (samsung_dma_has_circular() ? DMA_CYCLIC : DMA_SLAVE);
	87	dma_info.direction =
	88	(substream->stream == SNDRV_PCM_STREAM_PLAYBACK
35e16581	89	? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM);
344b4c48 BK	90	dma_info.fp = audio_buffdone;
	91	dma_info.fp_param = substream;
	92	dma_info.period = prtd->dma_period;
	93	dma_info.len = prtd->dma_period*limit;
c0f41bb1	94
344b4c48	95	while (prtd->dma_loaded < limit) {
ee7d4767	96	pr_debug("dma_loaded: %d\n", prtd->dma_loaded);
c0f41bb1	97
344b4c48 BK	98	if ((pos + dma_info.period) > prtd->dma_end) {
	99	dma_info.period = prtd->dma_end - pos;
	100	pr_debug("%s: corrected dma len %ld\n",
	101	__func__, dma_info.period);
c0f41bb1 BD	102	}
c0f41bb1 BD	103
344b4c48 BK	104	dma_info.buf = pos;
344b4c48 BK	105	prtd->params->ops->prepare(prtd->params->ch, &dma_info);
c0f41bb1	106
344b4c48 BK	107	prtd->dma_loaded++;
	108	pos += prtd->dma_period;
	109	if (pos >= prtd->dma_end)
	110	pos = prtd->dma_start;
c0f41bb1 BD	111	}
	112
	113	prtd->dma_pos = pos;
	114	}
	115
344b4c48	116	static void audio_buffdone(void *data)
c0f41bb1	117	{
344b4c48 BK	118	struct snd_pcm_substream *substream = data;
344b4c48 BK	119	struct runtime_data *prtd = substream->runtime->private_data;
c0f41bb1	120
ee7d4767	121	pr_debug("Entered %s\n", __func__);
c0f41bb1	122
344b4c48 BK	123	if (prtd->state & ST_RUNNING) {
	124	prtd->dma_pos += prtd->dma_period;
	125	if (prtd->dma_pos >= prtd->dma_end)
	126	prtd->dma_pos = prtd->dma_start;
5111c075	127
344b4c48 BK	128	if (substream)
344b4c48 BK	129	snd_pcm_period_elapsed(substream);
c0f41bb1	130
344b4c48 BK	131	spin_lock(&prtd->lock);
	132	if (!samsung_dma_has_circular()) {
	133	prtd->dma_loaded--;
	134	dma_enqueue(substream);
	135	}
	136	spin_unlock(&prtd->lock);
c0f41bb1	137	}
c0f41bb1 BD	138	}
c0f41bb1 BD	139
c3f2028b	140	static int dma_hw_params(struct snd_pcm_substream *substream,
c0f41bb1 BD	141	struct snd_pcm_hw_params *params)
	142	{
	143	struct snd_pcm_runtime *runtime = substream->runtime;
c3f2028b	144	struct runtime_data *prtd = runtime->private_data;
c0f41bb1	145	struct snd_soc_pcm_runtime *rtd = substream->private_data;
c0f41bb1	146	unsigned long totbytes = params_buffer_bytes(params);
5f712b2b	147	struct s3c_dma_params *dma =
f0fba2ad	148	snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
344b4c48	149	struct samsung_dma_info dma_info;
5f712b2b	150
ee7d4767	151	pr_debug("Entered %s\n", __func__);
c0f41bb1 BD	152
	153	/* return if this is a bufferless transfer e.g.
	154	* codec <--> BT codec or GSM modem -- lg FIXME */
	155	if (!dma)
	156	return 0;
	157
646ab160 HW	158	/* this may get called several times by oss emulation
	159	* with different params -HW */
	160	if (prtd->params == NULL) {
	161	/* prepare DMA */
	162	prtd->params = dma;
c0f41bb1	163
ee7d4767	164	pr_debug("params %p, client %p, channel %d\n", prtd->params,
646ab160	165	prtd->params->client, prtd->params->channel);
c0f41bb1	166
344b4c48 BK	167	prtd->params->ops = samsung_dma_get_ops();
	168
	169	dma_info.cap = (samsung_dma_has_circular() ?
	170	DMA_CYCLIC : DMA_SLAVE);
	171	dma_info.client = prtd->params->client;
	172	dma_info.direction =
	173	(substream->stream == SNDRV_PCM_STREAM_PLAYBACK
35e16581	174	? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM);
344b4c48 BK	175	dma_info.width = prtd->params->dma_size;
	176	dma_info.fifo = prtd->params->dma_addr;
	177	prtd->params->ch = prtd->params->ops->request(
	178	prtd->params->channel, &dma_info);
c0f41bb1 BD	179	}
c0f41bb1 BD	180
c0f41bb1 BD	181	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	182
	183	runtime->dma_bytes = totbytes;
	184
	185	spin_lock_irq(&prtd->lock);
	186	prtd->dma_loaded = 0;
c0f41bb1 BD	187	prtd->dma_period = params_period_bytes(params);
	188	prtd->dma_start = runtime->dma_addr;
	189	prtd->dma_pos = prtd->dma_start;
	190	prtd->dma_end = prtd->dma_start + totbytes;
	191	spin_unlock_irq(&prtd->lock);
	192
	193	return 0;
	194	}
	195
c3f2028b	196	static int dma_hw_free(struct snd_pcm_substream *substream)
c0f41bb1	197	{
c3f2028b	198	struct runtime_data *prtd = substream->runtime->private_data;
c0f41bb1	199
ee7d4767	200	pr_debug("Entered %s\n", __func__);
c0f41bb1	201
c0f41bb1 BD	202	snd_pcm_set_runtime_buffer(substream, NULL);
c0f41bb1 BD	203
7f1bc26e	204	if (prtd->params) {
2ca95769	205	prtd->params->ops->flush(prtd->params->ch);
344b4c48 BK	206	prtd->params->ops->release(prtd->params->ch,
344b4c48 BK	207	prtd->params->client);
c0f41bb1 BD	208	prtd->params = NULL;
	209	}
	210
	211	return 0;
	212	}
	213
c3f2028b	214	static int dma_prepare(struct snd_pcm_substream *substream)
c0f41bb1	215	{
c3f2028b	216	struct runtime_data *prtd = substream->runtime->private_data;
c0f41bb1 BD	217	int ret = 0;
c0f41bb1 BD	218
ee7d4767	219	pr_debug("Entered %s\n", __func__);
c0f41bb1 BD	220
	221	/* return if this is a bufferless transfer e.g.
	222	* codec <--> BT codec or GSM modem -- lg FIXME */
	223	if (!prtd->params)
5111c075	224	return 0;
c0f41bb1 BD	225
c0f41bb1 BD	226	/* flush the DMA channel */
344b4c48 BK	227	prtd->params->ops->flush(prtd->params->ch);
344b4c48 BK	228
c0f41bb1 BD	229	prtd->dma_loaded = 0;
	230	prtd->dma_pos = prtd->dma_start;
	231
	232	/* enqueue dma buffers */
c3f2028b	233	dma_enqueue(substream);
c0f41bb1 BD	234
	235	return ret;
	236	}
	237
c3f2028b	238	static int dma_trigger(struct snd_pcm_substream *substream, int cmd)
c0f41bb1	239	{
c3f2028b	240	struct runtime_data *prtd = substream->runtime->private_data;
c0f41bb1 BD	241	int ret = 0;
c0f41bb1 BD	242
ee7d4767	243	pr_debug("Entered %s\n", __func__);
c0f41bb1 BD	244
	245	spin_lock(&prtd->lock);
	246
	247	switch (cmd) {
	248	case SNDRV_PCM_TRIGGER_START:
	249	case SNDRV_PCM_TRIGGER_RESUME:
	250	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	251	prtd->state \|= ST_RUNNING;
344b4c48	252	prtd->params->ops->trigger(prtd->params->ch);
c0f41bb1 BD	253	break;
	254
	255	case SNDRV_PCM_TRIGGER_STOP:
	256	case SNDRV_PCM_TRIGGER_SUSPEND:
	257	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	258	prtd->state &= ~ST_RUNNING;
344b4c48	259	prtd->params->ops->stop(prtd->params->ch);
c0f41bb1 BD	260	break;
	261
	262	default:
	263	ret = -EINVAL;
	264	break;
	265	}
	266
	267	spin_unlock(&prtd->lock);
	268
	269	return ret;
	270	}
	271
5111c075	272	static snd_pcm_uframes_t
c3f2028b	273	dma_pointer(struct snd_pcm_substream *substream)
c0f41bb1 BD	274	{
c0f41bb1 BD	275	struct snd_pcm_runtime *runtime = substream->runtime;
c3f2028b	276	struct runtime_data *prtd = runtime->private_data;
c0f41bb1	277	unsigned long res;
c0f41bb1	278
ee7d4767	279	pr_debug("Entered %s\n", __func__);
c0f41bb1	280
344b4c48	281	res = prtd->dma_pos - prtd->dma_start;
c0f41bb1	282
344b4c48	283	pr_debug("Pointer offset: %lu\n", res);
c0f41bb1 BD	284
	285	/* we seem to be getting the odd error from the pcm library due
	286	* to out-of-bounds pointers. this is maybe due to the dma engine
	287	* not having loaded the new values for the channel before being
ceade6c8	288	* called... (todo - fix )
c0f41bb1 BD	289	*/
	290
	291	if (res >= snd_pcm_lib_buffer_bytes(substream)) {
	292	if (res == snd_pcm_lib_buffer_bytes(substream))
	293	res = 0;
	294	}
	295
	296	return bytes_to_frames(substream->runtime, res);
	297	}
	298
c3f2028b	299	static int dma_open(struct snd_pcm_substream *substream)
c0f41bb1 BD	300	{
c0f41bb1 BD	301	struct snd_pcm_runtime *runtime = substream->runtime;
c3f2028b	302	struct runtime_data *prtd;
c0f41bb1	303
ee7d4767	304	pr_debug("Entered %s\n", __func__);
c0f41bb1	305
f61c890e	306	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
c3f2028b	307	snd_soc_set_runtime_hwparams(substream, &dma_hardware);
c0f41bb1	308
c3f2028b	309	prtd = kzalloc(sizeof(struct runtime_data), GFP_KERNEL);
c0f41bb1 BD	310	if (prtd == NULL)
	311	return -ENOMEM;
	312
c72816b7 ZD	313	spin_lock_init(&prtd->lock);
c72816b7 ZD	314
c0f41bb1 BD	315	runtime->private_data = prtd;
	316	return 0;
	317	}
	318
c3f2028b	319	static int dma_close(struct snd_pcm_substream *substream)
c0f41bb1 BD	320	{
c0f41bb1 BD	321	struct snd_pcm_runtime *runtime = substream->runtime;
c3f2028b	322	struct runtime_data *prtd = runtime->private_data;
c0f41bb1	323
ee7d4767	324	pr_debug("Entered %s\n", __func__);
c0f41bb1	325
5111c075	326	if (!prtd)
c3f2028b	327	pr_debug("dma_close called with prtd == NULL\n");
c0f41bb1	328
5111c075 MB	329	kfree(prtd);
5111c075 MB	330
c0f41bb1 BD	331	return 0;
	332	}
	333
c3f2028b	334	static int dma_mmap(struct snd_pcm_substream *substream,
c0f41bb1 BD	335	struct vm_area_struct *vma)
	336	{
	337	struct snd_pcm_runtime *runtime = substream->runtime;
	338
ee7d4767	339	pr_debug("Entered %s\n", __func__);
c0f41bb1 BD	340
c0f41bb1 BD	341	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
5111c075 MB	342	runtime->dma_area,
	343	runtime->dma_addr,
	344	runtime->dma_bytes);
c0f41bb1 BD	345	}
c0f41bb1 BD	346
c3f2028b JB	347	static struct snd_pcm_ops dma_ops = {
	348	.open = dma_open,
	349	.close = dma_close,
c0f41bb1	350	.ioctl = snd_pcm_lib_ioctl,
c3f2028b JB	351	.hw_params = dma_hw_params,
	352	.hw_free = dma_hw_free,
	353	.prepare = dma_prepare,
	354	.trigger = dma_trigger,
	355	.pointer = dma_pointer,
	356	.mmap = dma_mmap,
c0f41bb1 BD	357	};
c0f41bb1 BD	358
c3f2028b	359	static int preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
c0f41bb1 BD	360	{
	361	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	362	struct snd_dma_buffer *buf = &substream->dma_buffer;
c3f2028b	363	size_t size = dma_hardware.buffer_bytes_max;
c0f41bb1	364
ee7d4767	365	pr_debug("Entered %s\n", __func__);
c0f41bb1 BD	366
	367	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	368	buf->dev.dev = pcm->card->dev;
	369	buf->private_data = NULL;
	370	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
	371	&buf->addr, GFP_KERNEL);
	372	if (!buf->area)
	373	return -ENOMEM;
	374	buf->bytes = size;
	375	return 0;
	376	}
	377
c3f2028b	378	static void dma_free_dma_buffers(struct snd_pcm *pcm)
c0f41bb1 BD	379	{
	380	struct snd_pcm_substream *substream;
	381	struct snd_dma_buffer *buf;
	382	int stream;
	383
ee7d4767	384	pr_debug("Entered %s\n", __func__);
c0f41bb1 BD	385
	386	for (stream = 0; stream < 2; stream++) {
	387	substream = pcm->streams[stream].substream;
	388	if (!substream)
	389	continue;
	390
	391	buf = &substream->dma_buffer;
	392	if (!buf->area)
	393	continue;
	394
	395	dma_free_writecombine(pcm->card->dev, buf->bytes,
	396	buf->area, buf->addr);
	397	buf->area = NULL;
	398	}
	399	}
	400
c3f2028b	401	static u64 dma_mask = DMA_BIT_MASK(32);
c0f41bb1	402
552d1ef6	403	static int dma_new(struct snd_soc_pcm_runtime *rtd)
c0f41bb1	404	{
552d1ef6	405	struct snd_card *card = rtd->card->snd_card;
552d1ef6	406	struct snd_pcm *pcm = rtd->pcm;
c0f41bb1 BD	407	int ret = 0;
c0f41bb1 BD	408
ee7d4767	409	pr_debug("Entered %s\n", __func__);
c0f41bb1 BD	410
c0f41bb1 BD	411	if (!card->dev->dma_mask)
c3f2028b	412	card->dev->dma_mask = &dma_mask;
c0f41bb1	413	if (!card->dev->coherent_dma_mask)
350e16d5	414	card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
c0f41bb1	415
25e9e756	416	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
c3f2028b	417	ret = preallocate_dma_buffer(pcm,
c0f41bb1 BD	418	SNDRV_PCM_STREAM_PLAYBACK);
	419	if (ret)
	420	goto out;
	421	}
	422
25e9e756	423	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
c3f2028b	424	ret = preallocate_dma_buffer(pcm,
c0f41bb1 BD	425	SNDRV_PCM_STREAM_CAPTURE);
	426	if (ret)
	427	goto out;
	428	}
4b640cf3	429	out:
c0f41bb1 BD	430	return ret;
	431	}
	432
c3f2028b JB	433	static struct snd_soc_platform_driver samsung_asoc_platform = {
	434	.ops = &dma_ops,
	435	.pcm_new = dma_new,
	436	.pcm_free = dma_free_dma_buffers,
c0f41bb1	437	};
c0f41bb1	438
c3f2028b	439	static int __devinit samsung_asoc_platform_probe(struct platform_device *pdev)
958e792c	440	{
c3f2028b	441	return snd_soc_register_platform(&pdev->dev, &samsung_asoc_platform);
958e792c	442	}
958e792c	443
c3f2028b	444	static int __devexit samsung_asoc_platform_remove(struct platform_device *pdev)
958e792c	445	{
f0fba2ad LG	446	snd_soc_unregister_platform(&pdev->dev);
	447	return 0;
	448	}
	449
c3f2028b	450	static struct platform_driver asoc_dma_driver = {
f0fba2ad	451	.driver = {
58bb4072	452	.name = "samsung-audio",
f0fba2ad LG	453	.owner = THIS_MODULE,
	454	},
	455
c3f2028b JB	456	.probe = samsung_asoc_platform_probe,
c3f2028b JB	457	.remove = __devexit_p(samsung_asoc_platform_remove),
f0fba2ad LG	458	};
f0fba2ad LG	459
e00c3f55	460	module_platform_driver(asoc_dma_driver);
958e792c	461
c0f41bb1	462	MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
c3f2028b	463	MODULE_DESCRIPTION("Samsung ASoC DMA Driver");
c0f41bb1	464	MODULE_LICENSE("GPL");
58bb4072	465	MODULE_ALIAS("platform:samsung-audio");