[mirror_ubuntu-artful-kernel.git] / sound / soc / s3c24xx / s3c24xx-pcm.c

/*
 * s3c24xx-pcm.c  --  ALSA Soc Audio Layer
 *
 * (c) 2006 Wolfson Microelectronics PLC.
 * Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
 *
 * (c) 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 <mach/audio.h>

#include "s3c24xx-pcm.h"

#define S3C24XX_PCM_DEBUG 0
#if S3C24XX_PCM_DEBUG
#define DBG(x...) printk(KERN_DEBUG "s3c24xx-pcm: " x)
#else
#define DBG(x...)
#endif

static const struct snd_pcm_hardware s3c24xx_pcm_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 s3c24xx_pcm_dma_params *params;
};

/* s3c24xx_pcm_enqueue
 *
 * place a dma buffer onto the queue for the dma system
 * to handle.
*/
static void s3c24xx_pcm_enqueue(struct snd_pcm_substream *substream,
				int dma_max)
{
	struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
	dma_addr_t pos = prtd->dma_pos;
	int ret;

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

	if (!dma_max)
		dma_max = prtd->dma_limit;

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

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

		if ((pos + len) > prtd->dma_end) {
			len  = prtd->dma_end - pos;
			DBG(KERN_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;

	DBG("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) {
		prtd->dma_loaded--;
		s3c24xx_pcm_enqueue(substream, 0);
	}

	spin_unlock(&prtd->lock);
}

static int s3c24xx_pcm_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;
	struct s3c24xx_pcm_dma_params *dma = rtd->dai->cpu_dai->dma_data;
	unsigned long totbytes = params_buffer_bytes(params);
	int ret = 0;

	DBG("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;

		DBG("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) {
			DBG(KERN_ERR "failed to get dma channel\n");
			return ret;
		}
	}

	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 s3c24xx_pcm_hw_free(struct snd_pcm_substream *substream)
{
	struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;

	DBG("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 s3c24xx_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
	int ret = 0;

	DBG("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, S3C2410_DISRCC_INC |
				S3C2410_DISRCC_APB, prtd->params->dma_addr);

		s3c2410_dma_config(prtd->params->channel,
				prtd->params->dma_size,
				S3C2410_DCON_SYNC_PCLK |
				S3C2410_DCON_HANDSHAKE);
	} else {
		s3c2410_dma_config(prtd->params->channel,
				prtd->params->dma_size,
				S3C2410_DCON_HANDSHAKE |
				S3C2410_DCON_SYNC_PCLK);

		s3c2410_dma_devconfig(prtd->params->channel,
					S3C2410_DMASRC_HW, 0x3,
					prtd->params->dma_addr);
	}

	/* 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 */
	s3c24xx_pcm_enqueue(substream, 1);

	return ret;
}

static int s3c24xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
	int ret = 0;

	DBG("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);
		s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STARTED);
		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
s3c24xx_pcm_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;

	DBG("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);

	DBG("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 s3c24xx_pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct s3c24xx_runtime_data *prtd;

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

	snd_soc_set_runtime_hwparams(substream, &s3c24xx_pcm_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 s3c24xx_pcm_close(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct s3c24xx_runtime_data *prtd = runtime->private_data;

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

	if (!prtd)
		DBG("s3c24xx_pcm_close called with prtd == NULL\n");

	kfree(prtd);

	return 0;
}

static int s3c24xx_pcm_mmap(struct snd_pcm_substream *substream,
	struct vm_area_struct *vma)
{
	struct snd_pcm_runtime *runtime = substream->runtime;

	DBG("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 s3c24xx_pcm_ops = {
	.open		= s3c24xx_pcm_open,
	.close		= s3c24xx_pcm_close,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= s3c24xx_pcm_hw_params,
	.hw_free	= s3c24xx_pcm_hw_free,
	.prepare	= s3c24xx_pcm_prepare,
	.trigger	= s3c24xx_pcm_trigger,
	.pointer	= s3c24xx_pcm_pointer,
	.mmap		= s3c24xx_pcm_mmap,
};

static int s3c24xx_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 = s3c24xx_pcm_hardware.buffer_bytes_max;

	DBG("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 s3c24xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
{
	struct snd_pcm_substream *substream;
	struct snd_dma_buffer *buf;
	int stream;

	DBG("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 s3c24xx_pcm_dmamask = DMA_32BIT_MASK;

static int s3c24xx_pcm_new(struct snd_card *card,
	struct snd_soc_dai *dai, struct snd_pcm *pcm)
{
	int ret = 0;

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

	if (!card->dev->dma_mask)
		card->dev->dma_mask = &s3c24xx_pcm_dmamask;
	if (!card->dev->coherent_dma_mask)
		card->dev->coherent_dma_mask = 0xffffffff;

	if (dai->playback.channels_min) {
		ret = s3c24xx_pcm_preallocate_dma_buffer(pcm,
			SNDRV_PCM_STREAM_PLAYBACK);
		if (ret)
			goto out;
	}

	if (dai->capture.channels_min) {
		ret = s3c24xx_pcm_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 	= &s3c24xx_pcm_ops,
	.pcm_new	= s3c24xx_pcm_new,
	.pcm_free	= s3c24xx_pcm_free_dma_buffers,
};
EXPORT_SYMBOL_GPL(s3c24xx_soc_platform);

MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
MODULE_DESCRIPTION("Samsung S3C24XX PCM DMA module");
MODULE_LICENSE("GPL");
Commit	Line	Data
c0f41bb1 BD	1	/*
	2	* s3c24xx-pcm.c -- ALSA Soc Audio Layer
	3	*
	4	* (c) 2006 Wolfson Microelectronics PLC.
	5	* Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
	6	*
	7	* (c) 2004-2005 Simtec Electronics
	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>
	31	#include <mach/dma.h>
	32	#include <mach/audio.h>
c0f41bb1 BD	33
	34	#include "s3c24xx-pcm.h"
	35
	36	#define S3C24XX_PCM_DEBUG 0
	37	#if S3C24XX_PCM_DEBUG
40920307	38	#define DBG(x...) printk(KERN_DEBUG "s3c24xx-pcm: " x)
c0f41bb1 BD	39	#else
	40	#define DBG(x...)
	41	#endif
	42
	43	static const struct snd_pcm_hardware s3c24xx_pcm_hardware = {
	44	.info = SNDRV_PCM_INFO_INTERLEAVED \|
	45	SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	46	SNDRV_PCM_INFO_MMAP \|
96d90e19 GG	47	SNDRV_PCM_INFO_MMAP_VALID \|
	48	SNDRV_PCM_INFO_PAUSE \|
	49	SNDRV_PCM_INFO_RESUME,
c0f41bb1 BD	50	.formats = SNDRV_PCM_FMTBIT_S16_LE \|
	51	SNDRV_PCM_FMTBIT_U16_LE \|
	52	SNDRV_PCM_FMTBIT_U8 \|
	53	SNDRV_PCM_FMTBIT_S8,
	54	.channels_min = 2,
	55	.channels_max = 2,
	56	.buffer_bytes_max = 128*1024,
	57	.period_bytes_min = PAGE_SIZE,
	58	.period_bytes_max = PAGE_SIZE*2,
	59	.periods_min = 2,
	60	.periods_max = 128,
	61	.fifo_size = 32,
	62	};
	63
	64	struct s3c24xx_runtime_data {
	65	spinlock_t lock;
	66	int state;
	67	unsigned int dma_loaded;
	68	unsigned int dma_limit;
	69	unsigned int dma_period;
	70	dma_addr_t dma_start;
	71	dma_addr_t dma_pos;
	72	dma_addr_t dma_end;
	73	struct s3c24xx_pcm_dma_params *params;
	74	};
	75
	76	/* s3c24xx_pcm_enqueue
	77	*
	78	* place a dma buffer onto the queue for the dma system
	79	* to handle.
	80	*/
8dc840f8 DA	81	static void s3c24xx_pcm_enqueue(struct snd_pcm_substream *substream,
8dc840f8 DA	82	int dma_max)
c0f41bb1 BD	83	{
	84	struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
	85	dma_addr_t pos = prtd->dma_pos;
	86	int ret;
	87
9bf8e7dd	88	DBG("Entered %s\n", __func__);
c0f41bb1	89
8dc840f8 DA	90	if (!dma_max)
	91	dma_max = prtd->dma_limit;
	92
	93	while (prtd->dma_loaded < dma_max) {
c0f41bb1 BD	94	unsigned long len = prtd->dma_period;
c0f41bb1 BD	95
5111c075	96	DBG("dma_loaded: %d\n", prtd->dma_loaded);
c0f41bb1 BD	97
	98	if ((pos + len) > prtd->dma_end) {
	99	len = prtd->dma_end - pos;
	100	DBG(KERN_DEBUG "%s: corrected dma len %ld\n",
9bf8e7dd	101	__func__, len);
c0f41bb1 BD	102	}
c0f41bb1 BD	103
5111c075	104	ret = s3c2410_dma_enqueue(prtd->params->channel,
7f1bc26e	105	substream, pos, len);
c0f41bb1 BD	106
	107	if (ret == 0) {
	108	prtd->dma_loaded++;
	109	pos += prtd->dma_period;
	110	if (pos >= prtd->dma_end)
	111	pos = prtd->dma_start;
	112	} else
	113	break;
	114	}
	115
	116	prtd->dma_pos = pos;
	117	}
	118
	119	static void s3c24xx_audio_buffdone(struct s3c2410_dma_chan *channel,
7f1bc26e GG	120	void *dev_id, int size,
7f1bc26e GG	121	enum s3c2410_dma_buffresult result)
c0f41bb1 BD	122	{
c0f41bb1 BD	123	struct snd_pcm_substream *substream = dev_id;
7f1bc26e	124	struct s3c24xx_runtime_data *prtd;
c0f41bb1	125
9bf8e7dd	126	DBG("Entered %s\n", __func__);
c0f41bb1 BD	127
	128	if (result == S3C2410_RES_ABORT \|\| result == S3C2410_RES_ERR)
	129	return;
	130
7f1bc26e	131	prtd = substream->runtime->private_data;
5111c075	132
c0f41bb1 BD	133	if (substream)
	134	snd_pcm_period_elapsed(substream);
	135
	136	spin_lock(&prtd->lock);
	137	if (prtd->state & ST_RUNNING) {
	138	prtd->dma_loaded--;
8dc840f8	139	s3c24xx_pcm_enqueue(substream, 0);
c0f41bb1 BD	140	}
	141
	142	spin_unlock(&prtd->lock);
	143	}
	144
	145	static int s3c24xx_pcm_hw_params(struct snd_pcm_substream *substream,
	146	struct snd_pcm_hw_params *params)
	147	{
	148	struct snd_pcm_runtime *runtime = substream->runtime;
	149	struct s3c24xx_runtime_data *prtd = runtime->private_data;
	150	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	151	struct s3c24xx_pcm_dma_params *dma = rtd->dai->cpu_dai->dma_data;
	152	unsigned long totbytes = params_buffer_bytes(params);
5111c075	153	int ret = 0;
c0f41bb1	154
9bf8e7dd	155	DBG("Entered %s\n", __func__);
c0f41bb1 BD	156
	157	/* return if this is a bufferless transfer e.g.
	158	* codec <--> BT codec or GSM modem -- lg FIXME */
	159	if (!dma)
	160	return 0;
	161
646ab160 HW	162	/* this may get called several times by oss emulation
	163	* with different params -HW */
	164	if (prtd->params == NULL) {
	165	/* prepare DMA */
	166	prtd->params = dma;
c0f41bb1	167
646ab160 HW	168	DBG("params %p, client %p, channel %d\n", prtd->params,
646ab160 HW	169	prtd->params->client, prtd->params->channel);
c0f41bb1	170
646ab160 HW	171	ret = s3c2410_dma_request(prtd->params->channel,
646ab160 HW	172	prtd->params->client, NULL);
c0f41bb1	173
d6426171	174	if (ret < 0) {
646ab160 HW	175	DBG(KERN_ERR "failed to get dma channel\n");
	176	return ret;
	177	}
c0f41bb1 BD	178	}
c0f41bb1 BD	179
c0f41bb1 BD	180	s3c2410_dma_set_buffdone_fn(prtd->params->channel,
	181	s3c24xx_audio_buffdone);
	182
	183	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	184
	185	runtime->dma_bytes = totbytes;
	186
	187	spin_lock_irq(&prtd->lock);
	188	prtd->dma_loaded = 0;
	189	prtd->dma_limit = runtime->hw.periods_min;
	190	prtd->dma_period = params_period_bytes(params);
	191	prtd->dma_start = runtime->dma_addr;
	192	prtd->dma_pos = prtd->dma_start;
	193	prtd->dma_end = prtd->dma_start + totbytes;
	194	spin_unlock_irq(&prtd->lock);
	195
	196	return 0;
	197	}
	198
	199	static int s3c24xx_pcm_hw_free(struct snd_pcm_substream *substream)
	200	{
	201	struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
	202
9bf8e7dd	203	DBG("Entered %s\n", __func__);
c0f41bb1 BD	204
	205	/* TODO - do we need to ensure DMA flushed */
	206	snd_pcm_set_runtime_buffer(substream, NULL);
	207
7f1bc26e	208	if (prtd->params) {
c0f41bb1 BD	209	s3c2410_dma_free(prtd->params->channel, prtd->params->client);
	210	prtd->params = NULL;
	211	}
	212
	213	return 0;
	214	}
	215
	216	static int s3c24xx_pcm_prepare(struct snd_pcm_substream *substream)
	217	{
	218	struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
	219	int ret = 0;
	220
9bf8e7dd	221	DBG("Entered %s\n", __func__);
c0f41bb1 BD	222
	223	/* return if this is a bufferless transfer e.g.
	224	* codec <--> BT codec or GSM modem -- lg FIXME */
	225	if (!prtd->params)
5111c075	226	return 0;
c0f41bb1	227
96d90e19 GG	228	/* channel needs configuring for mem=>device, increment memory addr,
	229	* sync to pclk, half-word transfers to the IIS-FIFO. */
	230	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	231	s3c2410_dma_devconfig(prtd->params->channel,
	232	S3C2410_DMASRC_MEM, S3C2410_DISRCC_INC \|
	233	S3C2410_DISRCC_APB, prtd->params->dma_addr);
	234
	235	s3c2410_dma_config(prtd->params->channel,
	236	prtd->params->dma_size,
	237	S3C2410_DCON_SYNC_PCLK \|
	238	S3C2410_DCON_HANDSHAKE);
	239	} else {
	240	s3c2410_dma_config(prtd->params->channel,
	241	prtd->params->dma_size,
	242	S3C2410_DCON_HANDSHAKE \|
	243	S3C2410_DCON_SYNC_PCLK);
	244
	245	s3c2410_dma_devconfig(prtd->params->channel,
	246	S3C2410_DMASRC_HW, 0x3,
	247	prtd->params->dma_addr);
	248	}
	249
c0f41bb1 BD	250	/* flush the DMA channel */
	251	s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_FLUSH);
	252	prtd->dma_loaded = 0;
	253	prtd->dma_pos = prtd->dma_start;
	254
	255	/* enqueue dma buffers */
8dc840f8	256	s3c24xx_pcm_enqueue(substream, 1);
c0f41bb1 BD	257
	258	return ret;
	259	}
	260
	261	static int s3c24xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	262	{
	263	struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
	264	int ret = 0;
	265
9bf8e7dd	266	DBG("Entered %s\n", __func__);
c0f41bb1 BD	267
	268	spin_lock(&prtd->lock);
	269
	270	switch (cmd) {
	271	case SNDRV_PCM_TRIGGER_START:
	272	case SNDRV_PCM_TRIGGER_RESUME:
	273	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	274	prtd->state \|= ST_RUNNING;
	275	s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_START);
	276	s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STARTED);
	277	break;
	278
	279	case SNDRV_PCM_TRIGGER_STOP:
	280	case SNDRV_PCM_TRIGGER_SUSPEND:
	281	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	282	prtd->state &= ~ST_RUNNING;
	283	s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STOP);
	284	break;
	285
	286	default:
	287	ret = -EINVAL;
	288	break;
	289	}
	290
	291	spin_unlock(&prtd->lock);
	292
	293	return ret;
	294	}
	295
5111c075 MB	296	static snd_pcm_uframes_t
5111c075 MB	297	s3c24xx_pcm_pointer(struct snd_pcm_substream *substream)
c0f41bb1 BD	298	{
	299	struct snd_pcm_runtime *runtime = substream->runtime;
	300	struct s3c24xx_runtime_data *prtd = runtime->private_data;
	301	unsigned long res;
	302	dma_addr_t src, dst;
	303
9bf8e7dd	304	DBG("Entered %s\n", __func__);
c0f41bb1 BD	305
	306	spin_lock(&prtd->lock);
	307	s3c2410_dma_getposition(prtd->params->channel, &src, &dst);
	308
	309	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
	310	res = dst - prtd->dma_start;
	311	else
	312	res = src - prtd->dma_start;
	313
	314	spin_unlock(&prtd->lock);
	315
5111c075	316	DBG("Pointer %x %x\n", src, dst);
c0f41bb1 BD	317
	318	/* we seem to be getting the odd error from the pcm library due
	319	* to out-of-bounds pointers. this is maybe due to the dma engine
	320	* not having loaded the new values for the channel before being
	321	* callled... (todo - fix )
	322	*/
	323
	324	if (res >= snd_pcm_lib_buffer_bytes(substream)) {
	325	if (res == snd_pcm_lib_buffer_bytes(substream))
	326	res = 0;
	327	}
	328
	329	return bytes_to_frames(substream->runtime, res);
	330	}
	331
	332	static int s3c24xx_pcm_open(struct snd_pcm_substream *substream)
	333	{
	334	struct snd_pcm_runtime *runtime = substream->runtime;
	335	struct s3c24xx_runtime_data *prtd;
	336
9bf8e7dd	337	DBG("Entered %s\n", __func__);
c0f41bb1 BD	338
	339	snd_soc_set_runtime_hwparams(substream, &s3c24xx_pcm_hardware);
	340
	341	prtd = kzalloc(sizeof(struct s3c24xx_runtime_data), GFP_KERNEL);
	342	if (prtd == NULL)
	343	return -ENOMEM;
	344
c72816b7 ZD	345	spin_lock_init(&prtd->lock);
c72816b7 ZD	346
c0f41bb1 BD	347	runtime->private_data = prtd;
	348	return 0;
	349	}
	350
	351	static int s3c24xx_pcm_close(struct snd_pcm_substream *substream)
	352	{
	353	struct snd_pcm_runtime *runtime = substream->runtime;
	354	struct s3c24xx_runtime_data *prtd = runtime->private_data;
	355
9bf8e7dd	356	DBG("Entered %s\n", __func__);
c0f41bb1	357
5111c075	358	if (!prtd)
c0f41bb1 BD	359	DBG("s3c24xx_pcm_close called with prtd == NULL\n");
c0f41bb1 BD	360
5111c075 MB	361	kfree(prtd);
5111c075 MB	362
c0f41bb1 BD	363	return 0;
	364	}
	365
	366	static int s3c24xx_pcm_mmap(struct snd_pcm_substream *substream,
	367	struct vm_area_struct *vma)
	368	{
	369	struct snd_pcm_runtime *runtime = substream->runtime;
	370
9bf8e7dd	371	DBG("Entered %s\n", __func__);
c0f41bb1 BD	372
c0f41bb1 BD	373	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
5111c075 MB	374	runtime->dma_area,
	375	runtime->dma_addr,
	376	runtime->dma_bytes);
c0f41bb1 BD	377	}
	378
	379	static struct snd_pcm_ops s3c24xx_pcm_ops = {
	380	.open = s3c24xx_pcm_open,
	381	.close = s3c24xx_pcm_close,
	382	.ioctl = snd_pcm_lib_ioctl,
	383	.hw_params = s3c24xx_pcm_hw_params,
	384	.hw_free = s3c24xx_pcm_hw_free,
	385	.prepare = s3c24xx_pcm_prepare,
	386	.trigger = s3c24xx_pcm_trigger,
	387	.pointer = s3c24xx_pcm_pointer,
	388	.mmap = s3c24xx_pcm_mmap,
	389	};
	390
	391	static int s3c24xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
	392	{
	393	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	394	struct snd_dma_buffer *buf = &substream->dma_buffer;
	395	size_t size = s3c24xx_pcm_hardware.buffer_bytes_max;
	396
9bf8e7dd	397	DBG("Entered %s\n", __func__);
c0f41bb1 BD	398
	399	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	400	buf->dev.dev = pcm->card->dev;
	401	buf->private_data = NULL;
	402	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
	403	&buf->addr, GFP_KERNEL);
	404	if (!buf->area)
	405	return -ENOMEM;
	406	buf->bytes = size;
	407	return 0;
	408	}
	409
	410	static void s3c24xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
	411	{
	412	struct snd_pcm_substream *substream;
	413	struct snd_dma_buffer *buf;
	414	int stream;
	415
9bf8e7dd	416	DBG("Entered %s\n", __func__);
c0f41bb1 BD	417
	418	for (stream = 0; stream < 2; stream++) {
	419	substream = pcm->streams[stream].substream;
	420	if (!substream)
	421	continue;
	422
	423	buf = &substream->dma_buffer;
	424	if (!buf->area)
	425	continue;
	426
	427	dma_free_writecombine(pcm->card->dev, buf->bytes,
	428	buf->area, buf->addr);
	429	buf->area = NULL;
	430	}
	431	}
	432
	433	static u64 s3c24xx_pcm_dmamask = DMA_32BIT_MASK;
	434
5111c075	435	static int s3c24xx_pcm_new(struct snd_card *card,
1992a6fb	436	struct snd_soc_dai dai, struct snd_pcm pcm)
c0f41bb1 BD	437	{
	438	int ret = 0;
	439
9bf8e7dd	440	DBG("Entered %s\n", __func__);
c0f41bb1 BD	441
	442	if (!card->dev->dma_mask)
	443	card->dev->dma_mask = &s3c24xx_pcm_dmamask;
	444	if (!card->dev->coherent_dma_mask)
	445	card->dev->coherent_dma_mask = 0xffffffff;
	446
	447	if (dai->playback.channels_min) {
	448	ret = s3c24xx_pcm_preallocate_dma_buffer(pcm,
	449	SNDRV_PCM_STREAM_PLAYBACK);
	450	if (ret)
	451	goto out;
	452	}
	453
	454	if (dai->capture.channels_min) {
	455	ret = s3c24xx_pcm_preallocate_dma_buffer(pcm,
	456	SNDRV_PCM_STREAM_CAPTURE);
	457	if (ret)
	458	goto out;
	459	}
	460	out:
	461	return ret;
	462	}
	463
	464	struct snd_soc_platform s3c24xx_soc_platform = {
	465	.name = "s3c24xx-audio",
	466	.pcm_ops = &s3c24xx_pcm_ops,
	467	.pcm_new = s3c24xx_pcm_new,
	468	.pcm_free = s3c24xx_pcm_free_dma_buffers,
	469	};
c0f41bb1 BD	470	EXPORT_SYMBOL_GPL(s3c24xx_soc_platform);
	471
	472	MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
	473	MODULE_DESCRIPTION("Samsung S3C24XX PCM DMA module");
	474	MODULE_LICENSE("GPL");