[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,
	.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 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_req req;
	struct samsung_dma_config config;

	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();

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

	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:
		prtd->state |= ST_RUNNING;
		prtd->params->ops->trigger(prtd->params->ch);
		break;

	case SNDRV_PCM_TRIGGER_STOP:
		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,
};

int asoc_dma_platform_register(struct device *dev)
{
	return snd_soc_register_platform(dev, &samsung_asoc_platform);
}
EXPORT_SYMBOL_GPL(asoc_dma_platform_register);

void asoc_dma_platform_unregister(struct device *dev)
{
	snd_soc_unregister_platform(dev);
}
EXPORT_SYMBOL_GPL(asoc_dma_platform_unregister);

MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
MODULE_DESCRIPTION("Samsung ASoC DMA Driver");
MODULE_LICENSE("GPL");
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 \|
57b2d688	37	SNDRV_PCM_INFO_MMAP_VALID,
c0f41bb1 BD	38	.formats = SNDRV_PCM_FMTBIT_S16_LE \|
	39	SNDRV_PCM_FMTBIT_U16_LE \|
	40	SNDRV_PCM_FMTBIT_U8 \|
	41	SNDRV_PCM_FMTBIT_S8,
	42	.channels_min = 2,
	43	.channels_max = 2,
	44	.buffer_bytes_max = 128*1024,
	45	.period_bytes_min = PAGE_SIZE,
	46	.period_bytes_max = PAGE_SIZE*2,
	47	.periods_min = 2,
	48	.periods_max = 128,
	49	.fifo_size = 32,
	50	};
	51
c3f2028b	52	struct runtime_data {
c0f41bb1 BD	53	spinlock_t lock;
	54	int state;
	55	unsigned int dma_loaded;
c0f41bb1 BD	56	unsigned int dma_period;
	57	dma_addr_t dma_start;
	58	dma_addr_t dma_pos;
	59	dma_addr_t dma_end;
faa31776	60	struct s3c_dma_params *params;
c0f41bb1 BD	61	};
c0f41bb1 BD	62
344b4c48 BK	63	static void audio_buffdone(void *data);
344b4c48 BK	64
c3f2028b	65	/* dma_enqueue
c0f41bb1 BD	66	*
	67	* place a dma buffer onto the queue for the dma system
	68	* to handle.
344b4c48	69	*/
c3f2028b	70	static void dma_enqueue(struct snd_pcm_substream *substream)
c0f41bb1	71	{
c3f2028b	72	struct runtime_data *prtd = substream->runtime->private_data;
c0f41bb1	73	dma_addr_t pos = prtd->dma_pos;
e3d80248	74	unsigned int limit;
21c4afed	75	struct samsung_dma_prep dma_info;
c0f41bb1	76
ee7d4767	77	pr_debug("Entered %s\n", __func__);
c0f41bb1	78
344b4c48	79	limit = (prtd->dma_end - prtd->dma_start) / prtd->dma_period;
e3d80248	80
d3ff5a3e JB	81	pr_debug("%s: loaded %d, limit %d\n",
d3ff5a3e JB	82	__func__, prtd->dma_loaded, limit);
e3d80248	83
344b4c48 BK	84	dma_info.cap = (samsung_dma_has_circular() ? DMA_CYCLIC : DMA_SLAVE);
	85	dma_info.direction =
	86	(substream->stream == SNDRV_PCM_STREAM_PLAYBACK
35e16581	87	? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM);
344b4c48 BK	88	dma_info.fp = audio_buffdone;
	89	dma_info.fp_param = substream;
	90	dma_info.period = prtd->dma_period;
	91	dma_info.len = prtd->dma_period*limit;
c0f41bb1	92
344b4c48	93	while (prtd->dma_loaded < limit) {
ee7d4767	94	pr_debug("dma_loaded: %d\n", prtd->dma_loaded);
c0f41bb1	95
344b4c48 BK	96	if ((pos + dma_info.period) > prtd->dma_end) {
	97	dma_info.period = prtd->dma_end - pos;
	98	pr_debug("%s: corrected dma len %ld\n",
	99	__func__, dma_info.period);
c0f41bb1 BD	100	}
c0f41bb1 BD	101
344b4c48 BK	102	dma_info.buf = pos;
344b4c48 BK	103	prtd->params->ops->prepare(prtd->params->ch, &dma_info);
c0f41bb1	104
344b4c48 BK	105	prtd->dma_loaded++;
	106	pos += prtd->dma_period;
	107	if (pos >= prtd->dma_end)
	108	pos = prtd->dma_start;
c0f41bb1 BD	109	}
	110
	111	prtd->dma_pos = pos;
	112	}
	113
344b4c48	114	static void audio_buffdone(void *data)
c0f41bb1	115	{
344b4c48 BK	116	struct snd_pcm_substream *substream = data;
344b4c48 BK	117	struct runtime_data *prtd = substream->runtime->private_data;
c0f41bb1	118
ee7d4767	119	pr_debug("Entered %s\n", __func__);
c0f41bb1	120
344b4c48 BK	121	if (prtd->state & ST_RUNNING) {
	122	prtd->dma_pos += prtd->dma_period;
	123	if (prtd->dma_pos >= prtd->dma_end)
	124	prtd->dma_pos = prtd->dma_start;
5111c075	125
344b4c48 BK	126	if (substream)
344b4c48 BK	127	snd_pcm_period_elapsed(substream);
c0f41bb1	128
344b4c48 BK	129	spin_lock(&prtd->lock);
	130	if (!samsung_dma_has_circular()) {
	131	prtd->dma_loaded--;
	132	dma_enqueue(substream);
	133	}
	134	spin_unlock(&prtd->lock);
c0f41bb1	135	}
c0f41bb1 BD	136	}
c0f41bb1 BD	137
c3f2028b	138	static int dma_hw_params(struct snd_pcm_substream *substream,
c0f41bb1 BD	139	struct snd_pcm_hw_params *params)
	140	{
	141	struct snd_pcm_runtime *runtime = substream->runtime;
c3f2028b	142	struct runtime_data *prtd = runtime->private_data;
c0f41bb1	143	struct snd_soc_pcm_runtime *rtd = substream->private_data;
c0f41bb1	144	unsigned long totbytes = params_buffer_bytes(params);
5f712b2b	145	struct s3c_dma_params *dma =
f0fba2ad	146	snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
21c4afed BK	147	struct samsung_dma_req req;
21c4afed BK	148	struct samsung_dma_config config;
5f712b2b	149
ee7d4767	150	pr_debug("Entered %s\n", __func__);
c0f41bb1 BD	151
	152	/* return if this is a bufferless transfer e.g.
	153	* codec <--> BT codec or GSM modem -- lg FIXME */
	154	if (!dma)
	155	return 0;
	156
646ab160 HW	157	/* this may get called several times by oss emulation
	158	* with different params -HW */
	159	if (prtd->params == NULL) {
	160	/* prepare DMA */
	161	prtd->params = dma;
c0f41bb1	162
ee7d4767	163	pr_debug("params %p, client %p, channel %d\n", prtd->params,
646ab160	164	prtd->params->client, prtd->params->channel);
c0f41bb1	165
344b4c48 BK	166	prtd->params->ops = samsung_dma_get_ops();
344b4c48 BK	167
21c4afed	168	req.cap = (samsung_dma_has_circular() ?
344b4c48	169	DMA_CYCLIC : DMA_SLAVE);
21c4afed BK	170	req.client = prtd->params->client;
21c4afed BK	171	config.direction =
344b4c48	172	(substream->stream == SNDRV_PCM_STREAM_PLAYBACK
35e16581	173	? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM);
21c4afed BK	174	config.width = prtd->params->dma_size;
21c4afed BK	175	config.fifo = prtd->params->dma_addr;
344b4c48	176	prtd->params->ch = prtd->params->ops->request(
40476f61 PV	177	prtd->params->channel, &req, rtd->cpu_dai->dev,
40476f61 PV	178	prtd->params->ch_name);
21c4afed	179	prtd->params->ops->config(prtd->params->ch, &config);
c0f41bb1 BD	180	}
c0f41bb1 BD	181
c0f41bb1 BD	182	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	183
	184	runtime->dma_bytes = totbytes;
	185
	186	spin_lock_irq(&prtd->lock);
	187	prtd->dma_loaded = 0;
c0f41bb1 BD	188	prtd->dma_period = params_period_bytes(params);
	189	prtd->dma_start = runtime->dma_addr;
	190	prtd->dma_pos = prtd->dma_start;
	191	prtd->dma_end = prtd->dma_start + totbytes;
	192	spin_unlock_irq(&prtd->lock);
	193
	194	return 0;
	195	}
	196
c3f2028b	197	static int dma_hw_free(struct snd_pcm_substream *substream)
c0f41bb1	198	{
c3f2028b	199	struct runtime_data *prtd = substream->runtime->private_data;
c0f41bb1	200
ee7d4767	201	pr_debug("Entered %s\n", __func__);
c0f41bb1	202
c0f41bb1 BD	203	snd_pcm_set_runtime_buffer(substream, NULL);
c0f41bb1 BD	204
7f1bc26e	205	if (prtd->params) {
2ca95769	206	prtd->params->ops->flush(prtd->params->ch);
344b4c48 BK	207	prtd->params->ops->release(prtd->params->ch,
344b4c48 BK	208	prtd->params->client);
c0f41bb1 BD	209	prtd->params = NULL;
	210	}
	211
	212	return 0;
	213	}
	214
c3f2028b	215	static int dma_prepare(struct snd_pcm_substream *substream)
c0f41bb1	216	{
c3f2028b	217	struct runtime_data *prtd = substream->runtime->private_data;
c0f41bb1 BD	218	int ret = 0;
c0f41bb1 BD	219
ee7d4767	220	pr_debug("Entered %s\n", __func__);
c0f41bb1 BD	221
	222	/* return if this is a bufferless transfer e.g.
	223	* codec <--> BT codec or GSM modem -- lg FIXME */
	224	if (!prtd->params)
5111c075	225	return 0;
c0f41bb1 BD	226
c0f41bb1 BD	227	/* flush the DMA channel */
344b4c48 BK	228	prtd->params->ops->flush(prtd->params->ch);
344b4c48 BK	229
c0f41bb1 BD	230	prtd->dma_loaded = 0;
	231	prtd->dma_pos = prtd->dma_start;
	232
	233	/* enqueue dma buffers */
c3f2028b	234	dma_enqueue(substream);
c0f41bb1 BD	235
	236	return ret;
	237	}
	238
c3f2028b	239	static int dma_trigger(struct snd_pcm_substream *substream, int cmd)
c0f41bb1	240	{
c3f2028b	241	struct runtime_data *prtd = substream->runtime->private_data;
c0f41bb1 BD	242	int ret = 0;
c0f41bb1 BD	243
ee7d4767	244	pr_debug("Entered %s\n", __func__);
c0f41bb1 BD	245
	246	spin_lock(&prtd->lock);
	247
	248	switch (cmd) {
	249	case SNDRV_PCM_TRIGGER_START:
c0f41bb1	250	prtd->state \|= ST_RUNNING;
344b4c48	251	prtd->params->ops->trigger(prtd->params->ch);
c0f41bb1 BD	252	break;
	253
	254	case SNDRV_PCM_TRIGGER_STOP:
c0f41bb1	255	prtd->state &= ~ST_RUNNING;
344b4c48	256	prtd->params->ops->stop(prtd->params->ch);
c0f41bb1 BD	257	break;
	258
	259	default:
	260	ret = -EINVAL;
	261	break;
	262	}
	263
	264	spin_unlock(&prtd->lock);
	265
	266	return ret;
	267	}
	268
5111c075	269	static snd_pcm_uframes_t
c3f2028b	270	dma_pointer(struct snd_pcm_substream *substream)
c0f41bb1 BD	271	{
c0f41bb1 BD	272	struct snd_pcm_runtime *runtime = substream->runtime;
c3f2028b	273	struct runtime_data *prtd = runtime->private_data;
c0f41bb1	274	unsigned long res;
c0f41bb1	275
ee7d4767	276	pr_debug("Entered %s\n", __func__);
c0f41bb1	277
344b4c48	278	res = prtd->dma_pos - prtd->dma_start;
c0f41bb1	279
344b4c48	280	pr_debug("Pointer offset: %lu\n", res);
c0f41bb1 BD	281
	282	/* we seem to be getting the odd error from the pcm library due
	283	* to out-of-bounds pointers. this is maybe due to the dma engine
	284	* not having loaded the new values for the channel before being
ceade6c8	285	* called... (todo - fix )
c0f41bb1 BD	286	*/
	287
	288	if (res >= snd_pcm_lib_buffer_bytes(substream)) {
	289	if (res == snd_pcm_lib_buffer_bytes(substream))
	290	res = 0;
	291	}
	292
	293	return bytes_to_frames(substream->runtime, res);
	294	}
	295
c3f2028b	296	static int dma_open(struct snd_pcm_substream *substream)
c0f41bb1 BD	297	{
c0f41bb1 BD	298	struct snd_pcm_runtime *runtime = substream->runtime;
c3f2028b	299	struct runtime_data *prtd;
c0f41bb1	300
ee7d4767	301	pr_debug("Entered %s\n", __func__);
c0f41bb1	302
f61c890e	303	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
c3f2028b	304	snd_soc_set_runtime_hwparams(substream, &dma_hardware);
c0f41bb1	305
c3f2028b	306	prtd = kzalloc(sizeof(struct runtime_data), GFP_KERNEL);
c0f41bb1 BD	307	if (prtd == NULL)
	308	return -ENOMEM;
	309
c72816b7 ZD	310	spin_lock_init(&prtd->lock);
c72816b7 ZD	311
c0f41bb1 BD	312	runtime->private_data = prtd;
	313	return 0;
	314	}
	315
c3f2028b	316	static int dma_close(struct snd_pcm_substream *substream)
c0f41bb1 BD	317	{
c0f41bb1 BD	318	struct snd_pcm_runtime *runtime = substream->runtime;
c3f2028b	319	struct runtime_data *prtd = runtime->private_data;
c0f41bb1	320
ee7d4767	321	pr_debug("Entered %s\n", __func__);
c0f41bb1	322
5111c075	323	if (!prtd)
c3f2028b	324	pr_debug("dma_close called with prtd == NULL\n");
c0f41bb1	325
5111c075 MB	326	kfree(prtd);
5111c075 MB	327
c0f41bb1 BD	328	return 0;
	329	}
	330
c3f2028b	331	static int dma_mmap(struct snd_pcm_substream *substream,
c0f41bb1 BD	332	struct vm_area_struct *vma)
	333	{
	334	struct snd_pcm_runtime *runtime = substream->runtime;
	335
ee7d4767	336	pr_debug("Entered %s\n", __func__);
c0f41bb1 BD	337
c0f41bb1 BD	338	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
5111c075 MB	339	runtime->dma_area,
	340	runtime->dma_addr,
	341	runtime->dma_bytes);
c0f41bb1 BD	342	}
c0f41bb1 BD	343
c3f2028b JB	344	static struct snd_pcm_ops dma_ops = {
	345	.open = dma_open,
	346	.close = dma_close,
c0f41bb1	347	.ioctl = snd_pcm_lib_ioctl,
c3f2028b JB	348	.hw_params = dma_hw_params,
	349	.hw_free = dma_hw_free,
	350	.prepare = dma_prepare,
	351	.trigger = dma_trigger,
	352	.pointer = dma_pointer,
	353	.mmap = dma_mmap,
c0f41bb1 BD	354	};
c0f41bb1 BD	355
c3f2028b	356	static int preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
c0f41bb1 BD	357	{
	358	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	359	struct snd_dma_buffer *buf = &substream->dma_buffer;
c3f2028b	360	size_t size = dma_hardware.buffer_bytes_max;
c0f41bb1	361
ee7d4767	362	pr_debug("Entered %s\n", __func__);
c0f41bb1 BD	363
	364	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	365	buf->dev.dev = pcm->card->dev;
	366	buf->private_data = NULL;
	367	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
	368	&buf->addr, GFP_KERNEL);
	369	if (!buf->area)
	370	return -ENOMEM;
	371	buf->bytes = size;
	372	return 0;
	373	}
	374
c3f2028b	375	static void dma_free_dma_buffers(struct snd_pcm *pcm)
c0f41bb1 BD	376	{
	377	struct snd_pcm_substream *substream;
	378	struct snd_dma_buffer *buf;
	379	int stream;
	380
ee7d4767	381	pr_debug("Entered %s\n", __func__);
c0f41bb1 BD	382
	383	for (stream = 0; stream < 2; stream++) {
	384	substream = pcm->streams[stream].substream;
	385	if (!substream)
	386	continue;
	387
	388	buf = &substream->dma_buffer;
	389	if (!buf->area)
	390	continue;
	391
	392	dma_free_writecombine(pcm->card->dev, buf->bytes,
	393	buf->area, buf->addr);
	394	buf->area = NULL;
	395	}
	396	}
	397
c3f2028b	398	static u64 dma_mask = DMA_BIT_MASK(32);
c0f41bb1	399
552d1ef6	400	static int dma_new(struct snd_soc_pcm_runtime *rtd)
c0f41bb1	401	{
552d1ef6	402	struct snd_card *card = rtd->card->snd_card;
552d1ef6	403	struct snd_pcm *pcm = rtd->pcm;
c0f41bb1 BD	404	int ret = 0;
c0f41bb1 BD	405
ee7d4767	406	pr_debug("Entered %s\n", __func__);
c0f41bb1 BD	407
c0f41bb1 BD	408	if (!card->dev->dma_mask)
c3f2028b	409	card->dev->dma_mask = &dma_mask;
c0f41bb1	410	if (!card->dev->coherent_dma_mask)
350e16d5	411	card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
c0f41bb1	412
25e9e756	413	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
c3f2028b	414	ret = preallocate_dma_buffer(pcm,
c0f41bb1 BD	415	SNDRV_PCM_STREAM_PLAYBACK);
	416	if (ret)
	417	goto out;
	418	}
	419
25e9e756	420	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
c3f2028b	421	ret = preallocate_dma_buffer(pcm,
c0f41bb1 BD	422	SNDRV_PCM_STREAM_CAPTURE);
	423	if (ret)
	424	goto out;
	425	}
4b640cf3	426	out:
c0f41bb1 BD	427	return ret;
	428	}
	429
c3f2028b JB	430	static struct snd_soc_platform_driver samsung_asoc_platform = {
	431	.ops = &dma_ops,
	432	.pcm_new = dma_new,
	433	.pcm_free = dma_free_dma_buffers,
c0f41bb1	434	};
c0f41bb1	435
fdca21ad	436	int asoc_dma_platform_register(struct device *dev)
958e792c	437	{
a08485d8	438	return snd_soc_register_platform(dev, &samsung_asoc_platform);
958e792c	439	}
a08485d8	440	EXPORT_SYMBOL_GPL(asoc_dma_platform_register);
958e792c	441
fdca21ad	442	void asoc_dma_platform_unregister(struct device *dev)
958e792c	443	{
a08485d8	444	snd_soc_unregister_platform(dev);
f0fba2ad	445	}
a08485d8	446	EXPORT_SYMBOL_GPL(asoc_dma_platform_unregister);
958e792c	447
c0f41bb1	448	MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
c3f2028b	449	MODULE_DESCRIPTION("Samsung ASoC DMA Driver");
c0f41bb1	450	MODULE_LICENSE("GPL");