[net-next-2.6.git] / sound / soc / s3c24xx / s3c-dma.c

/*
 * s3c-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/module.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>

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

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

#include "s3c-dma.h"

static const struct snd_pcm_hardware s3c_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 s3c24xx_runtime_data {
	spinlock_t lock;
	int state;
	unsigned int dma_loaded;
	unsigned int dma_limit;
	unsigned int dma_period;
	dma_addr_t dma_start;
	dma_addr_t dma_pos;
	dma_addr_t dma_end;
	struct s3c_dma_params *params;
};

/* s3c_dma_enqueue
 *
 * place a dma buffer onto the queue for the dma system
 * to handle.
*/
static void s3c_dma_enqueue(struct snd_pcm_substream *substream)
{
	struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
	dma_addr_t pos = prtd->dma_pos;
	unsigned int limit;
	int ret;

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

	if (s3c_dma_has_circular())
		limit = (prtd->dma_end - prtd->dma_start) / prtd->dma_period;
	else
		limit = prtd->dma_limit;

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

	while (prtd->dma_loaded < limit) {
		unsigned long len = prtd->dma_period;

		pr_debug("dma_loaded: %d\n", prtd->dma_loaded);

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

		ret = s3c2410_dma_enqueue(prtd->params->channel,
			substream, pos, len);

		if (ret == 0) {
			prtd->dma_loaded++;
			pos += prtd->dma_period;
			if (pos >= prtd->dma_end)
				pos = prtd->dma_start;
		} else
			break;
	}

	prtd->dma_pos = pos;
}

static void s3c24xx_audio_buffdone(struct s3c2410_dma_chan *channel,
				void *dev_id, int size,
				enum s3c2410_dma_buffresult result)
{
	struct snd_pcm_substream *substream = dev_id;
	struct s3c24xx_runtime_data *prtd;

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

	if (result == S3C2410_RES_ABORT || result == S3C2410_RES_ERR)
		return;

	prtd = substream->runtime->private_data;

	if (substream)
		snd_pcm_period_elapsed(substream);

	spin_lock(&prtd->lock);
	if (prtd->state & ST_RUNNING && !s3c_dma_has_circular()) {
		prtd->dma_loaded--;
		s3c_dma_enqueue(substream);
	}

	spin_unlock(&prtd->lock);
}

static int s3c_dma_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct s3c24xx_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->dai->cpu_dai, substream);
	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 (!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);

		ret = s3c2410_dma_request(prtd->params->channel,
					  prtd->params->client, NULL);

		if (ret < 0) {
			printk(KERN_ERR "failed to get dma channel\n");
			return ret;
		}

		/* use the circular buffering if we have it available. */
		if (s3c_dma_has_circular())
			s3c2410_dma_setflags(prtd->params->channel,
					     S3C2410_DMAF_CIRCULAR);
	}

	s3c2410_dma_set_buffdone_fn(prtd->params->channel,
				    s3c24xx_audio_buffdone);

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);

	runtime->dma_bytes = totbytes;

	spin_lock_irq(&prtd->lock);
	prtd->dma_loaded = 0;
	prtd->dma_limit = runtime->hw.periods_min;
	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 s3c_dma_hw_free(struct snd_pcm_substream *substream)
{
	struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;

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

	/* TODO - do we need to ensure DMA flushed */
	snd_pcm_set_runtime_buffer(substream, NULL);

	if (prtd->params) {
		s3c2410_dma_free(prtd->params->channel, prtd->params->client);
		prtd->params = NULL;
	}

	return 0;
}

static int s3c_dma_prepare(struct snd_pcm_substream *substream)
{
	struct s3c24xx_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;

	/* channel needs configuring for mem=>device, increment memory addr,
	 * sync to pclk, half-word transfers to the IIS-FIFO. */
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		s3c2410_dma_devconfig(prtd->params->channel,
				      S3C2410_DMASRC_MEM,
				      prtd->params->dma_addr);
	} else {
		s3c2410_dma_devconfig(prtd->params->channel,
				      S3C2410_DMASRC_HW,
				      prtd->params->dma_addr);
	}

	s3c2410_dma_config(prtd->params->channel,
			   prtd->params->dma_size);

	/* flush the DMA channel */
	s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_FLUSH);
	prtd->dma_loaded = 0;
	prtd->dma_pos = prtd->dma_start;

	/* enqueue dma buffers */
	s3c_dma_enqueue(substream);

	return ret;
}

static int s3c_dma_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct s3c24xx_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;
		s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_START);
		break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		prtd->state &= ~ST_RUNNING;
		s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STOP);
		break;

	default:
		ret = -EINVAL;
		break;
	}

	spin_unlock(&prtd->lock);

	return ret;
}

static snd_pcm_uframes_t
s3c_dma_pointer(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct s3c24xx_runtime_data *prtd = runtime->private_data;
	unsigned long res;
	dma_addr_t src, dst;

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

	spin_lock(&prtd->lock);
	s3c2410_dma_getposition(prtd->params->channel, &src, &dst);

	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
		res = dst - prtd->dma_start;
	else
		res = src - prtd->dma_start;

	spin_unlock(&prtd->lock);

	pr_debug("Pointer %x %x\n", src, dst);

	/* 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
	 * callled... (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 s3c_dma_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct s3c24xx_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, &s3c_dma_hardware);

	prtd = kzalloc(sizeof(struct s3c24xx_runtime_data), GFP_KERNEL);
	if (prtd == NULL)
		return -ENOMEM;

	spin_lock_init(&prtd->lock);

	runtime->private_data = prtd;
	return 0;
}

static int s3c_dma_close(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct s3c24xx_runtime_data *prtd = runtime->private_data;

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

	if (!prtd)
		pr_debug("s3c_dma_close called with prtd == NULL\n");

	kfree(prtd);

	return 0;
}

static int s3c_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 s3c_dma_ops = {
	.open		= s3c_dma_open,
	.close		= s3c_dma_close,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= s3c_dma_hw_params,
	.hw_free	= s3c_dma_hw_free,
	.prepare	= s3c_dma_prepare,
	.trigger	= s3c_dma_trigger,
	.pointer	= s3c_dma_pointer,
	.mmap		= s3c_dma_mmap,
};

static int s3c_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 = s3c_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 s3c_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 s3c_dma_mask = DMA_BIT_MASK(32);

static int s3c_dma_new(struct snd_card *card,
	struct snd_soc_dai *dai, struct snd_pcm *pcm)
{
	int ret = 0;

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

	if (!card->dev->dma_mask)
		card->dev->dma_mask = &s3c_dma_mask;
	if (!card->dev->coherent_dma_mask)
		card->dev->coherent_dma_mask = 0xffffffff;

	if (dai->playback.channels_min) {
		ret = s3c_preallocate_dma_buffer(pcm,
			SNDRV_PCM_STREAM_PLAYBACK);
		if (ret)
			goto out;
	}

	if (dai->capture.channels_min) {
		ret = s3c_preallocate_dma_buffer(pcm,
			SNDRV_PCM_STREAM_CAPTURE);
		if (ret)
			goto out;
	}
 out:
	return ret;
}

struct snd_soc_platform s3c24xx_soc_platform = {
	.name		= "s3c24xx-audio",
	.pcm_ops 	= &s3c_dma_ops,
	.pcm_new	= s3c_dma_new,
	.pcm_free	= s3c_dma_free_dma_buffers,
};
EXPORT_SYMBOL_GPL(s3c24xx_soc_platform);

static int __init s3c24xx_soc_platform_init(void)
{
	return snd_soc_register_platform(&s3c24xx_soc_platform);
}
module_init(s3c24xx_soc_platform_init);

static void __exit s3c24xx_soc_platform_exit(void)
{
	snd_soc_unregister_platform(&s3c24xx_soc_platform);
}
module_exit(s3c24xx_soc_platform_exit);

MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
MODULE_DESCRIPTION("Samsung S3C Audio DMA module");
MODULE_LICENSE("GPL");
Commit	Line	Data
c0f41bb1	1	/*
d3ff5a3e	2	* s3c-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	*/
	16
	17	#include <linux/module.h>
	18	#include <linux/init.h>
5111c075	19	#include <linux/io.h>
c0f41bb1 BD	20	#include <linux/platform_device.h>
	21	#include <linux/slab.h>
	22	#include <linux/dma-mapping.h>
	23
c0f41bb1 BD	24	#include <sound/core.h>
	25	#include <sound/pcm.h>
	26	#include <sound/pcm_params.h>
	27	#include <sound/soc.h>
	28
	29	#include <asm/dma.h>
a09e64fb RK	30	#include <mach/hardware.h>
a09e64fb RK	31	#include <mach/dma.h>
c0f41bb1	32
d3ff5a3e	33	#include "s3c-dma.h"
c0f41bb1	34
faa31776	35	static const struct snd_pcm_hardware s3c_dma_hardware = {
c0f41bb1 BD	36	.info = SNDRV_PCM_INFO_INTERLEAVED \|
	37	SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	38	SNDRV_PCM_INFO_MMAP \|
96d90e19 GG	39	SNDRV_PCM_INFO_MMAP_VALID \|
	40	SNDRV_PCM_INFO_PAUSE \|
	41	SNDRV_PCM_INFO_RESUME,
c0f41bb1 BD	42	.formats = SNDRV_PCM_FMTBIT_S16_LE \|
	43	SNDRV_PCM_FMTBIT_U16_LE \|
	44	SNDRV_PCM_FMTBIT_U8 \|
	45	SNDRV_PCM_FMTBIT_S8,
	46	.channels_min = 2,
	47	.channels_max = 2,
	48	.buffer_bytes_max = 128*1024,
	49	.period_bytes_min = PAGE_SIZE,
	50	.period_bytes_max = PAGE_SIZE*2,
	51	.periods_min = 2,
	52	.periods_max = 128,
	53	.fifo_size = 32,
	54	};
	55
	56	struct s3c24xx_runtime_data {
	57	spinlock_t lock;
	58	int state;
	59	unsigned int dma_loaded;
	60	unsigned int dma_limit;
	61	unsigned int dma_period;
	62	dma_addr_t dma_start;
	63	dma_addr_t dma_pos;
	64	dma_addr_t dma_end;
faa31776	65	struct s3c_dma_params *params;
c0f41bb1 BD	66	};
c0f41bb1 BD	67
faa31776	68	/* s3c_dma_enqueue
c0f41bb1 BD	69	*
	70	* place a dma buffer onto the queue for the dma system
	71	* to handle.
	72	*/
faa31776	73	static void s3c_dma_enqueue(struct snd_pcm_substream *substream)
c0f41bb1 BD	74	{
	75	struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
	76	dma_addr_t pos = prtd->dma_pos;
e3d80248	77	unsigned int limit;
c0f41bb1 BD	78	int ret;
c0f41bb1 BD	79
ee7d4767	80	pr_debug("Entered %s\n", __func__);
c0f41bb1	81
d3ff5a3e	82	if (s3c_dma_has_circular())
e3d80248	83	limit = (prtd->dma_end - prtd->dma_start) / prtd->dma_period;
d3ff5a3e	84	else
e3d80248 BD	85	limit = prtd->dma_limit;
e3d80248 BD	86
d3ff5a3e JB	87	pr_debug("%s: loaded %d, limit %d\n",
d3ff5a3e JB	88	__func__, prtd->dma_loaded, limit);
e3d80248 BD	89
e3d80248 BD	90	while (prtd->dma_loaded < limit) {
c0f41bb1 BD	91	unsigned long len = prtd->dma_period;
c0f41bb1 BD	92
ee7d4767	93	pr_debug("dma_loaded: %d\n", prtd->dma_loaded);
c0f41bb1 BD	94
	95	if ((pos + len) > prtd->dma_end) {
	96	len = prtd->dma_end - pos;
147fcf1c	97	pr_debug("%s: corrected dma len %ld\n", __func__, len);
c0f41bb1 BD	98	}
c0f41bb1 BD	99
5111c075	100	ret = s3c2410_dma_enqueue(prtd->params->channel,
7f1bc26e	101	substream, pos, len);
c0f41bb1 BD	102
	103	if (ret == 0) {
	104	prtd->dma_loaded++;
	105	pos += prtd->dma_period;
	106	if (pos >= prtd->dma_end)
	107	pos = prtd->dma_start;
	108	} else
	109	break;
	110	}
	111
	112	prtd->dma_pos = pos;
	113	}
	114
	115	static void s3c24xx_audio_buffdone(struct s3c2410_dma_chan *channel,
7f1bc26e GG	116	void *dev_id, int size,
7f1bc26e GG	117	enum s3c2410_dma_buffresult result)
c0f41bb1 BD	118	{
c0f41bb1 BD	119	struct snd_pcm_substream *substream = dev_id;
7f1bc26e	120	struct s3c24xx_runtime_data *prtd;
c0f41bb1	121
ee7d4767	122	pr_debug("Entered %s\n", __func__);
c0f41bb1 BD	123
	124	if (result == S3C2410_RES_ABORT \|\| result == S3C2410_RES_ERR)
	125	return;
	126
7f1bc26e	127	prtd = substream->runtime->private_data;
5111c075	128
c0f41bb1 BD	129	if (substream)
	130	snd_pcm_period_elapsed(substream);
	131
	132	spin_lock(&prtd->lock);
e3d80248	133	if (prtd->state & ST_RUNNING && !s3c_dma_has_circular()) {
c0f41bb1	134	prtd->dma_loaded--;
faa31776	135	s3c_dma_enqueue(substream);
c0f41bb1 BD	136	}
	137
	138	spin_unlock(&prtd->lock);
	139	}
	140
faa31776	141	static int s3c_dma_hw_params(struct snd_pcm_substream *substream,
c0f41bb1 BD	142	struct snd_pcm_hw_params *params)
	143	{
	144	struct snd_pcm_runtime *runtime = substream->runtime;
	145	struct s3c24xx_runtime_data *prtd = runtime->private_data;
	146	struct snd_soc_pcm_runtime *rtd = substream->private_data;
c0f41bb1	147	unsigned long totbytes = params_buffer_bytes(params);
5f712b2b DM	148	struct s3c_dma_params *dma =
5f712b2b DM	149	snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
5111c075	150	int ret = 0;
c0f41bb1	151
5f712b2b	152
ee7d4767	153	pr_debug("Entered %s\n", __func__);
c0f41bb1 BD	154
	155	/* return if this is a bufferless transfer e.g.
	156	* codec <--> BT codec or GSM modem -- lg FIXME */
	157	if (!dma)
	158	return 0;
	159
646ab160 HW	160	/* this may get called several times by oss emulation
	161	* with different params -HW */
	162	if (prtd->params == NULL) {
	163	/* prepare DMA */
	164	prtd->params = dma;
c0f41bb1	165
ee7d4767	166	pr_debug("params %p, client %p, channel %d\n", prtd->params,
646ab160	167	prtd->params->client, prtd->params->channel);
c0f41bb1	168
646ab160 HW	169	ret = s3c2410_dma_request(prtd->params->channel,
646ab160 HW	170	prtd->params->client, NULL);
c0f41bb1	171
d6426171	172	if (ret < 0) {
b52a5195	173	printk(KERN_ERR "failed to get dma channel\n");
646ab160 HW	174	return ret;
646ab160 HW	175	}
e3d80248 BD	176
	177	/* use the circular buffering if we have it available. */
	178	if (s3c_dma_has_circular())
	179	s3c2410_dma_setflags(prtd->params->channel,
	180	S3C2410_DMAF_CIRCULAR);
c0f41bb1 BD	181	}
c0f41bb1 BD	182
c0f41bb1 BD	183	s3c2410_dma_set_buffdone_fn(prtd->params->channel,
	184	s3c24xx_audio_buffdone);
	185
	186	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	187
	188	runtime->dma_bytes = totbytes;
	189
	190	spin_lock_irq(&prtd->lock);
	191	prtd->dma_loaded = 0;
	192	prtd->dma_limit = runtime->hw.periods_min;
	193	prtd->dma_period = params_period_bytes(params);
	194	prtd->dma_start = runtime->dma_addr;
	195	prtd->dma_pos = prtd->dma_start;
	196	prtd->dma_end = prtd->dma_start + totbytes;
	197	spin_unlock_irq(&prtd->lock);
	198
	199	return 0;
	200	}
	201
faa31776	202	static int s3c_dma_hw_free(struct snd_pcm_substream *substream)
c0f41bb1 BD	203	{
	204	struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
	205
ee7d4767	206	pr_debug("Entered %s\n", __func__);
c0f41bb1 BD	207
	208	/* TODO - do we need to ensure DMA flushed */
	209	snd_pcm_set_runtime_buffer(substream, NULL);
	210
7f1bc26e	211	if (prtd->params) {
c0f41bb1 BD	212	s3c2410_dma_free(prtd->params->channel, prtd->params->client);
	213	prtd->params = NULL;
	214	}
	215
	216	return 0;
	217	}
	218
faa31776	219	static int s3c_dma_prepare(struct snd_pcm_substream *substream)
c0f41bb1 BD	220	{
	221	struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
	222	int ret = 0;
	223
ee7d4767	224	pr_debug("Entered %s\n", __func__);
c0f41bb1 BD	225
	226	/* return if this is a bufferless transfer e.g.
	227	* codec <--> BT codec or GSM modem -- lg FIXME */
	228	if (!prtd->params)
5111c075	229	return 0;
c0f41bb1	230
96d90e19 GG	231	/* channel needs configuring for mem=>device, increment memory addr,
	232	* sync to pclk, half-word transfers to the IIS-FIFO. */
	233	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	234	s3c2410_dma_devconfig(prtd->params->channel,
8970ef47 BD	235	S3C2410_DMASRC_MEM,
8970ef47 BD	236	prtd->params->dma_addr);
96d90e19	237	} else {
96d90e19	238	s3c2410_dma_devconfig(prtd->params->channel,
8970ef47 BD	239	S3C2410_DMASRC_HW,
8970ef47 BD	240	prtd->params->dma_addr);
96d90e19 GG	241	}
96d90e19 GG	242
8970ef47 BD	243	s3c2410_dma_config(prtd->params->channel,
	244	prtd->params->dma_size);
	245
c0f41bb1 BD	246	/* flush the DMA channel */
	247	s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_FLUSH);
	248	prtd->dma_loaded = 0;
	249	prtd->dma_pos = prtd->dma_start;
	250
	251	/* enqueue dma buffers */
faa31776	252	s3c_dma_enqueue(substream);
c0f41bb1 BD	253
	254	return ret;
	255	}
	256
faa31776	257	static int s3c_dma_trigger(struct snd_pcm_substream *substream, int cmd)
c0f41bb1 BD	258	{
	259	struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
	260	int ret = 0;
	261
ee7d4767	262	pr_debug("Entered %s\n", __func__);
c0f41bb1 BD	263
	264	spin_lock(&prtd->lock);
	265
	266	switch (cmd) {
	267	case SNDRV_PCM_TRIGGER_START:
	268	case SNDRV_PCM_TRIGGER_RESUME:
	269	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	270	prtd->state \|= ST_RUNNING;
	271	s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_START);
c0f41bb1 BD	272	break;
	273
	274	case SNDRV_PCM_TRIGGER_STOP:
	275	case SNDRV_PCM_TRIGGER_SUSPEND:
	276	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	277	prtd->state &= ~ST_RUNNING;
	278	s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STOP);
	279	break;
	280
	281	default:
	282	ret = -EINVAL;
	283	break;
	284	}
	285
	286	spin_unlock(&prtd->lock);
	287
	288	return ret;
	289	}
	290
5111c075	291	static snd_pcm_uframes_t
faa31776	292	s3c_dma_pointer(struct snd_pcm_substream *substream)
c0f41bb1 BD	293	{
	294	struct snd_pcm_runtime *runtime = substream->runtime;
	295	struct s3c24xx_runtime_data *prtd = runtime->private_data;
	296	unsigned long res;
	297	dma_addr_t src, dst;
	298
ee7d4767	299	pr_debug("Entered %s\n", __func__);
c0f41bb1 BD	300
	301	spin_lock(&prtd->lock);
	302	s3c2410_dma_getposition(prtd->params->channel, &src, &dst);
	303
	304	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
	305	res = dst - prtd->dma_start;
	306	else
	307	res = src - prtd->dma_start;
	308
	309	spin_unlock(&prtd->lock);
	310
ee7d4767	311	pr_debug("Pointer %x %x\n", src, dst);
c0f41bb1 BD	312
	313	/* we seem to be getting the odd error from the pcm library due
	314	* to out-of-bounds pointers. this is maybe due to the dma engine
	315	* not having loaded the new values for the channel before being
	316	* callled... (todo - fix )
	317	*/
	318
	319	if (res >= snd_pcm_lib_buffer_bytes(substream)) {
	320	if (res == snd_pcm_lib_buffer_bytes(substream))
	321	res = 0;
	322	}
	323
	324	return bytes_to_frames(substream->runtime, res);
	325	}
	326
faa31776	327	static int s3c_dma_open(struct snd_pcm_substream *substream)
c0f41bb1 BD	328	{
	329	struct snd_pcm_runtime *runtime = substream->runtime;
	330	struct s3c24xx_runtime_data *prtd;
	331
ee7d4767	332	pr_debug("Entered %s\n", __func__);
c0f41bb1	333
f61c890e	334	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
faa31776	335	snd_soc_set_runtime_hwparams(substream, &s3c_dma_hardware);
c0f41bb1 BD	336
	337	prtd = kzalloc(sizeof(struct s3c24xx_runtime_data), GFP_KERNEL);
	338	if (prtd == NULL)
	339	return -ENOMEM;
	340
c72816b7 ZD	341	spin_lock_init(&prtd->lock);
c72816b7 ZD	342
c0f41bb1 BD	343	runtime->private_data = prtd;
	344	return 0;
	345	}
	346
faa31776	347	static int s3c_dma_close(struct snd_pcm_substream *substream)
c0f41bb1 BD	348	{
	349	struct snd_pcm_runtime *runtime = substream->runtime;
	350	struct s3c24xx_runtime_data *prtd = runtime->private_data;
	351
ee7d4767	352	pr_debug("Entered %s\n", __func__);
c0f41bb1	353
5111c075	354	if (!prtd)
faa31776	355	pr_debug("s3c_dma_close called with prtd == NULL\n");
c0f41bb1	356
5111c075 MB	357	kfree(prtd);
5111c075 MB	358
c0f41bb1 BD	359	return 0;
	360	}
	361
faa31776	362	static int s3c_dma_mmap(struct snd_pcm_substream *substream,
c0f41bb1 BD	363	struct vm_area_struct *vma)
	364	{
	365	struct snd_pcm_runtime *runtime = substream->runtime;
	366
ee7d4767	367	pr_debug("Entered %s\n", __func__);
c0f41bb1 BD	368
c0f41bb1 BD	369	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
5111c075 MB	370	runtime->dma_area,
	371	runtime->dma_addr,
	372	runtime->dma_bytes);
c0f41bb1 BD	373	}
c0f41bb1 BD	374
faa31776 JB	375	static struct snd_pcm_ops s3c_dma_ops = {
	376	.open = s3c_dma_open,
	377	.close = s3c_dma_close,
c0f41bb1	378	.ioctl = snd_pcm_lib_ioctl,
faa31776 JB	379	.hw_params = s3c_dma_hw_params,
	380	.hw_free = s3c_dma_hw_free,
	381	.prepare = s3c_dma_prepare,
	382	.trigger = s3c_dma_trigger,
	383	.pointer = s3c_dma_pointer,
	384	.mmap = s3c_dma_mmap,
c0f41bb1 BD	385	};
c0f41bb1 BD	386
faa31776	387	static int s3c_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
c0f41bb1 BD	388	{
	389	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	390	struct snd_dma_buffer *buf = &substream->dma_buffer;
faa31776	391	size_t size = s3c_dma_hardware.buffer_bytes_max;
c0f41bb1	392
ee7d4767	393	pr_debug("Entered %s\n", __func__);
c0f41bb1 BD	394
	395	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	396	buf->dev.dev = pcm->card->dev;
	397	buf->private_data = NULL;
	398	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
	399	&buf->addr, GFP_KERNEL);
	400	if (!buf->area)
	401	return -ENOMEM;
	402	buf->bytes = size;
	403	return 0;
	404	}
	405
faa31776	406	static void s3c_dma_free_dma_buffers(struct snd_pcm *pcm)
c0f41bb1 BD	407	{
	408	struct snd_pcm_substream *substream;
	409	struct snd_dma_buffer *buf;
	410	int stream;
	411
ee7d4767	412	pr_debug("Entered %s\n", __func__);
c0f41bb1 BD	413
	414	for (stream = 0; stream < 2; stream++) {
	415	substream = pcm->streams[stream].substream;
	416	if (!substream)
	417	continue;
	418
	419	buf = &substream->dma_buffer;
	420	if (!buf->area)
	421	continue;
	422
	423	dma_free_writecombine(pcm->card->dev, buf->bytes,
	424	buf->area, buf->addr);
	425	buf->area = NULL;
	426	}
	427	}
	428
faa31776	429	static u64 s3c_dma_mask = DMA_BIT_MASK(32);
c0f41bb1	430
faa31776	431	static int s3c_dma_new(struct snd_card *card,
1992a6fb	432	struct snd_soc_dai dai, struct snd_pcm pcm)
c0f41bb1 BD	433	{
	434	int ret = 0;
	435
ee7d4767	436	pr_debug("Entered %s\n", __func__);
c0f41bb1 BD	437
c0f41bb1 BD	438	if (!card->dev->dma_mask)
faa31776	439	card->dev->dma_mask = &s3c_dma_mask;
c0f41bb1 BD	440	if (!card->dev->coherent_dma_mask)
	441	card->dev->coherent_dma_mask = 0xffffffff;
	442
	443	if (dai->playback.channels_min) {
faa31776	444	ret = s3c_preallocate_dma_buffer(pcm,
c0f41bb1 BD	445	SNDRV_PCM_STREAM_PLAYBACK);
	446	if (ret)
	447	goto out;
	448	}
	449
	450	if (dai->capture.channels_min) {
faa31776	451	ret = s3c_preallocate_dma_buffer(pcm,
c0f41bb1 BD	452	SNDRV_PCM_STREAM_CAPTURE);
	453	if (ret)
	454	goto out;
	455	}
	456	out:
	457	return ret;
	458	}
	459
	460	struct snd_soc_platform s3c24xx_soc_platform = {
	461	.name = "s3c24xx-audio",
faa31776 JB	462	.pcm_ops = &s3c_dma_ops,
	463	.pcm_new = s3c_dma_new,
	464	.pcm_free = s3c_dma_free_dma_buffers,
c0f41bb1	465	};
c0f41bb1 BD	466	EXPORT_SYMBOL_GPL(s3c24xx_soc_platform);
c0f41bb1 BD	467
c9b3a40f	468	static int __init s3c24xx_soc_platform_init(void)
958e792c MB	469	{
	470	return snd_soc_register_platform(&s3c24xx_soc_platform);
	471	}
	472	module_init(s3c24xx_soc_platform_init);
	473
	474	static void __exit s3c24xx_soc_platform_exit(void)
	475	{
	476	snd_soc_unregister_platform(&s3c24xx_soc_platform);
	477	}
	478	module_exit(s3c24xx_soc_platform_exit);
	479
c0f41bb1	480	MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
faa31776	481	MODULE_DESCRIPTION("Samsung S3C Audio DMA module");
c0f41bb1	482	MODULE_LICENSE("GPL");