/*
 * Renesas R-Car SRU/SCU/SSIU/SSI support
 *
 * Copyright (C) 2013 Renesas Solutions Corp.
 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
 *
 * Based on fsi.c
 * Kuninori Morimoto <morimoto.kuninori@renesas.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

/*
 * Renesas R-Car sound device structure
 *
 * Gen1
 *
 * SRU		: Sound Routing Unit
 *  - SRC	: Sampling Rate Converter
 *  - CMD
 *    - CTU	: Channel Count Conversion Unit
 *    - MIX	: Mixer
 *    - DVC	: Digital Volume and Mute Function
 *  - SSI	: Serial Sound Interface
 *
 * Gen2
 *
 * SCU		: Sampling Rate Converter Unit
 *  - SRC	: Sampling Rate Converter
 *  - CMD
 *   - CTU	: Channel Count Conversion Unit
 *   - MIX	: Mixer
 *   - DVC	: Digital Volume and Mute Function
 * SSIU		: Serial Sound Interface Unit
 *  - SSI	: Serial Sound Interface
 */

/*
 *	driver data Image
 *
 * rsnd_priv
 *   |
 *   | ** this depends on Gen1/Gen2
 *   |
 *   +- gen
 *   |
 *   | ** these depend on data path
 *   | ** gen and platform data control it
 *   |
 *   +- rdai[0]
 *   |   |		 sru     ssiu      ssi
 *   |   +- playback -> [mod] -> [mod] -> [mod] -> ...
 *   |   |
 *   |   |		 sru     ssiu      ssi
 *   |   +- capture  -> [mod] -> [mod] -> [mod] -> ...
 *   |
 *   +- rdai[1]
 *   |   |		 sru     ssiu      ssi
 *   |   +- playback -> [mod] -> [mod] -> [mod] -> ...
 *   |   |
 *   |   |		 sru     ssiu      ssi
 *   |   +- capture  -> [mod] -> [mod] -> [mod] -> ...
 *   ...
 *   |
 *   | ** these control ssi
 *   |
 *   +- ssi
 *   |  |
 *   |  +- ssi[0]
 *   |  +- ssi[1]
 *   |  +- ssi[2]
 *   |  ...
 *   |
 *   | ** these control scu
 *   |
 *   +- scu
 *      |
 *      +- scu[0]
 *      +- scu[1]
 *      +- scu[2]
 *      ...
 *
 *
 * for_each_rsnd_dai(xx, priv, xx)
 *  rdai[0] => rdai[1] => rdai[2] => ...
 *
 * for_each_rsnd_mod(xx, rdai, xx)
 *  [mod] => [mod] => [mod] => ...
 *
 * rsnd_dai_call(xxx, fn )
 *  [mod]->fn() -> [mod]->fn() -> [mod]->fn()...
 *
 */
#include <linux/pm_runtime.h>
#include <linux/shdma-base.h>
#include "rsnd.h"

#define RSND_RATES SNDRV_PCM_RATE_8000_96000
#define RSND_FMTS (SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S16_LE)

/*
 *	rsnd_platform functions
 */
#define rsnd_platform_call(priv, dai, func, param...)	\
	(!(priv->info->func) ? 0 :		\
	 priv->info->func(param))

#define rsnd_is_enable_path(io, name) \
	((io)->info ? (io)->info->name : NULL)
#define rsnd_info_id(priv, io, name) \
	((io)->info->name - priv->info->name##_info)

/*
 *	rsnd_mod functions
 */
char *rsnd_mod_name(struct rsnd_mod *mod)
{
	if (!mod || !mod->ops)
		return "unknown";

	return mod->ops->name;
}

void rsnd_mod_init(struct rsnd_priv *priv,
		   struct rsnd_mod *mod,
		   struct rsnd_mod_ops *ops,
		   enum rsnd_mod_type type,
		   int id)
{
	mod->priv	= priv;
	mod->id		= id;
	mod->ops	= ops;
	mod->type	= type;
}

/*
 *	rsnd_dma functions
 */
static void __rsnd_dma_start(struct rsnd_dma *dma);
static void rsnd_dma_continue(struct rsnd_dma *dma)
{
	/* push next A or B plane */
	dma->submit_loop = 1;
	schedule_work(&dma->work);
}

void rsnd_dma_start(struct rsnd_dma *dma)
{
	/* push both A and B plane*/
	dma->offset = 0;
	dma->submit_loop = 2;
	__rsnd_dma_start(dma);
}

void rsnd_dma_stop(struct rsnd_dma *dma)
{
	dma->submit_loop = 0;
	cancel_work_sync(&dma->work);
	dmaengine_terminate_all(dma->chan);
}

static void rsnd_dma_complete(void *data)
{
	struct rsnd_dma *dma = (struct rsnd_dma *)data;
	struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
	struct rsnd_priv *priv = rsnd_mod_to_priv(rsnd_dma_to_mod(dma));
	struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
	unsigned long flags;

	rsnd_lock(priv, flags);

	/*
	 * Renesas sound Gen1 needs 1 DMAC,
	 * Gen2 needs 2 DMAC.
	 * In Gen2 case, it are Audio-DMAC, and Audio-DMAC-peri-peri.
	 * But, Audio-DMAC-peri-peri doesn't have interrupt,
	 * and this driver is assuming that here.
	 *
	 * If Audio-DMAC-peri-peri has interrpt,
	 * rsnd_dai_pointer_update() will be called twice,
	 * ant it will breaks io->byte_pos
	 */

	rsnd_dai_pointer_update(io, io->byte_per_period);

	if (dma->submit_loop)
		rsnd_dma_continue(dma);

	rsnd_unlock(priv, flags);
}

static void __rsnd_dma_start(struct rsnd_dma *dma)
{
	struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
	struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
	struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
	struct device *dev = rsnd_priv_to_dev(priv);
	struct dma_async_tx_descriptor *desc;
	dma_addr_t buf;
	size_t len = io->byte_per_period;
	int i;

	for (i = 0; i < dma->submit_loop; i++) {

		buf = runtime->dma_addr +
			rsnd_dai_pointer_offset(io, dma->offset + len);
		dma->offset = len;

		desc = dmaengine_prep_slave_single(
			dma->chan, buf, len, dma->dir,
			DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
		if (!desc) {
			dev_err(dev, "dmaengine_prep_slave_sg() fail\n");
			return;
		}

		desc->callback		= rsnd_dma_complete;
		desc->callback_param	= dma;

		if (dmaengine_submit(desc) < 0) {
			dev_err(dev, "dmaengine_submit() fail\n");
			return;
		}

		dma_async_issue_pending(dma->chan);
	}
}

static void rsnd_dma_do_work(struct work_struct *work)
{
	struct rsnd_dma *dma = container_of(work, struct rsnd_dma, work);

	__rsnd_dma_start(dma);
}

int rsnd_dma_available(struct rsnd_dma *dma)
{
	return !!dma->chan;
}

int rsnd_dma_init(struct rsnd_priv *priv, struct rsnd_dma *dma,
		  int is_play, int id)
{
	struct device *dev = rsnd_priv_to_dev(priv);
	struct dma_slave_config cfg;
	dma_cap_mask_t mask;
	int ret;

	if (dma->chan) {
		dev_err(dev, "it already has dma channel\n");
		return -EIO;
	}

	dma_cap_zero(mask);
	dma_cap_set(DMA_SLAVE, mask);

	dma->chan = dma_request_slave_channel_compat(mask, shdma_chan_filter,
						     (void *)id, dev,
						     is_play ? "tx" : "rx");
	if (!dma->chan) {
		dev_err(dev, "can't get dma channel\n");
		return -EIO;
	}

	cfg.slave_id	= id;
	cfg.dst_addr	= 0; /* use default addr when playback */
	cfg.src_addr	= 0; /* use default addr when capture */
	cfg.direction	= is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;

	ret = dmaengine_slave_config(dma->chan, &cfg);
	if (ret < 0)
		goto rsnd_dma_init_err;

	dma->dir = is_play ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
	INIT_WORK(&dma->work, rsnd_dma_do_work);

	return 0;

rsnd_dma_init_err:
	rsnd_dma_quit(priv, dma);

	return ret;
}

void  rsnd_dma_quit(struct rsnd_priv *priv,
		    struct rsnd_dma *dma)
{
	if (dma->chan)
		dma_release_channel(dma->chan);

	dma->chan = NULL;
}

/*
 *	rsnd_dai functions
 */
#define __rsnd_mod_call(mod, func, rdai, io)			\
({								\
	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);		\
	struct device *dev = rsnd_priv_to_dev(priv);		\
	dev_dbg(dev, "%s [%d] %s\n",				\
		rsnd_mod_name(mod), rsnd_mod_id(mod), #func);	\
	(mod)->ops->func(mod, rdai, io);			\
})

#define rsnd_mod_call(mod, func, rdai, io)	\
	(!(mod) ? -ENODEV :			\
	 !((mod)->ops->func) ? 0 :		\
	 __rsnd_mod_call(mod, func, (rdai), (io)))

#define rsnd_dai_call(rdai, io, fn)				\
({								\
	struct rsnd_mod *mod;					\
	int ret = 0, i;						\
	for (i = 0; i < RSND_MOD_MAX; i++) {			\
		mod = (io)->mod[i];				\
		if (!mod)					\
			continue;				\
		ret = rsnd_mod_call(mod, fn, (rdai), (io));	\
		if (ret < 0)					\
			break;					\
	}							\
	ret;							\
})

static int rsnd_dai_connect(struct rsnd_mod *mod,
			    struct rsnd_dai_stream *io)
{
	if (!mod)
		return -EIO;

	if (io->mod[mod->type]) {
		struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
		struct device *dev = rsnd_priv_to_dev(priv);

		dev_err(dev, "%s%d is not empty\n",
			rsnd_mod_name(mod),
			rsnd_mod_id(mod));
		return -EIO;
	}

	io->mod[mod->type] = mod;
	mod->io = io;

	return 0;
}

static int rsnd_dai_disconnect(struct rsnd_mod *mod, struct rsnd_dai_stream *io)
{
	io->mod[mod->type] = NULL;
	mod->io = NULL;

	return 0;
}

int rsnd_dai_id(struct rsnd_priv *priv, struct rsnd_dai *rdai)
{
	int id = rdai - priv->rdai;

	if ((id < 0) || (id >= rsnd_rdai_nr(priv)))
		return -EINVAL;

	return id;
}

struct rsnd_dai *rsnd_dai_get(struct rsnd_priv *priv, int id)
{
	if ((id < 0) || (id >= rsnd_rdai_nr(priv)))
		return NULL;

	return priv->rdai + id;
}

static struct rsnd_dai *rsnd_dai_to_rdai(struct snd_soc_dai *dai)
{
	struct rsnd_priv *priv = snd_soc_dai_get_drvdata(dai);

	return rsnd_dai_get(priv, dai->id);
}

int rsnd_dai_is_play(struct rsnd_dai *rdai, struct rsnd_dai_stream *io)
{
	return &rdai->playback == io;
}

/*
 *	rsnd_soc_dai functions
 */
int rsnd_dai_pointer_offset(struct rsnd_dai_stream *io, int additional)
{
	struct snd_pcm_substream *substream = io->substream;
	struct snd_pcm_runtime *runtime = substream->runtime;
	int pos = io->byte_pos + additional;

	pos %= (runtime->periods * io->byte_per_period);

	return pos;
}

void rsnd_dai_pointer_update(struct rsnd_dai_stream *io, int byte)
{
	io->byte_pos += byte;

	if (io->byte_pos >= io->next_period_byte) {
		struct snd_pcm_substream *substream = io->substream;
		struct snd_pcm_runtime *runtime = substream->runtime;

		io->period_pos++;
		io->next_period_byte += io->byte_per_period;

		if (io->period_pos >= runtime->periods) {
			io->byte_pos = 0;
			io->period_pos = 0;
			io->next_period_byte = io->byte_per_period;
		}

		snd_pcm_period_elapsed(substream);
	}
}

static int rsnd_dai_stream_init(struct rsnd_dai_stream *io,
				struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;

	io->substream		= substream;
	io->byte_pos		= 0;
	io->period_pos		= 0;
	io->byte_per_period	= runtime->period_size *
				  runtime->channels *
				  samples_to_bytes(runtime, 1);
	io->next_period_byte	= io->byte_per_period;

	return 0;
}

static
struct snd_soc_dai *rsnd_substream_to_dai(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	return  rtd->cpu_dai;
}

static
struct rsnd_dai_stream *rsnd_rdai_to_io(struct rsnd_dai *rdai,
					struct snd_pcm_substream *substream)
{
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		return &rdai->playback;
	else
		return &rdai->capture;
}

static int rsnd_soc_dai_trigger(struct snd_pcm_substream *substream, int cmd,
			    struct snd_soc_dai *dai)
{
	struct rsnd_priv *priv = snd_soc_dai_get_drvdata(dai);
	struct rsnd_dai *rdai = rsnd_dai_to_rdai(dai);
	struct rsnd_dai_stream *io = rsnd_rdai_to_io(rdai, substream);
	struct rsnd_mod *mod = rsnd_ssi_mod_get_frm_dai(priv,
						rsnd_dai_id(priv, rdai),
						rsnd_dai_is_play(rdai, io));
	int ssi_id = rsnd_mod_id(mod);
	int ret;
	unsigned long flags;

	rsnd_lock(priv, flags);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		ret = rsnd_dai_stream_init(io, substream);
		if (ret < 0)
			goto dai_trigger_end;

		ret = rsnd_platform_call(priv, dai, start, ssi_id);
		if (ret < 0)
			goto dai_trigger_end;

		ret = rsnd_dai_call(rdai, io, init);
		if (ret < 0)
			goto dai_trigger_end;

		ret = rsnd_dai_call(rdai, io, start);
		if (ret < 0)
			goto dai_trigger_end;
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		ret = rsnd_dai_call(rdai, io, stop);
		if (ret < 0)
			goto dai_trigger_end;

		ret = rsnd_dai_call(rdai, io, quit);
		if (ret < 0)
			goto dai_trigger_end;

		ret = rsnd_platform_call(priv, dai, stop, ssi_id);
		if (ret < 0)
			goto dai_trigger_end;
		break;
	default:
		ret = -EINVAL;
	}

dai_trigger_end:
	rsnd_unlock(priv, flags);

	return ret;
}

static int rsnd_soc_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
	struct rsnd_dai *rdai = rsnd_dai_to_rdai(dai);

	/* set master/slave audio interface */
	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
		rdai->clk_master = 1;
		break;
	case SND_SOC_DAIFMT_CBS_CFS:
		rdai->clk_master = 0;
		break;
	default:
		return -EINVAL;
	}

	/* set clock inversion */
	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_IF:
		rdai->bit_clk_inv = 0;
		rdai->frm_clk_inv = 1;
		break;
	case SND_SOC_DAIFMT_IB_NF:
		rdai->bit_clk_inv = 1;
		rdai->frm_clk_inv = 0;
		break;
	case SND_SOC_DAIFMT_IB_IF:
		rdai->bit_clk_inv = 1;
		rdai->frm_clk_inv = 1;
		break;
	case SND_SOC_DAIFMT_NB_NF:
	default:
		rdai->bit_clk_inv = 0;
		rdai->frm_clk_inv = 0;
		break;
	}

	/* set format */
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
		rdai->sys_delay = 0;
		rdai->data_alignment = 0;
		break;
	case SND_SOC_DAIFMT_LEFT_J:
		rdai->sys_delay = 1;
		rdai->data_alignment = 0;
		break;
	case SND_SOC_DAIFMT_RIGHT_J:
		rdai->sys_delay = 1;
		rdai->data_alignment = 1;
		break;
	}

	return 0;
}

static const struct snd_soc_dai_ops rsnd_soc_dai_ops = {
	.trigger	= rsnd_soc_dai_trigger,
	.set_fmt	= rsnd_soc_dai_set_fmt,
};

static int rsnd_path_init(struct rsnd_priv *priv,
			  struct rsnd_dai *rdai,
			  struct rsnd_dai_stream *io)
{
	struct rsnd_mod *mod;
	struct rsnd_dai_platform_info *dai_info = rdai->info;
	int ret;
	int ssi_id = -1;
	int scu_id = -1;

	/*
	 * Gen1 is created by SRU/SSI, and this SRU is base module of
	 * Gen2's SCU/SSIU/SSI. (Gen2 SCU/SSIU came from SRU)
	 *
	 * Easy image is..
	 *	Gen1 SRU = Gen2 SCU + SSIU + etc
	 *
	 * Gen2 SCU path is very flexible, but, Gen1 SRU (SCU parts) is
	 * using fixed path.
	 */
	if (dai_info) {
		if (rsnd_is_enable_path(io, ssi))
			ssi_id = rsnd_info_id(priv, io, ssi);
		if (rsnd_is_enable_path(io, scu))
			scu_id = rsnd_info_id(priv, io, scu);
	} else {
		/* get SSI's ID */
		mod = rsnd_ssi_mod_get_frm_dai(priv,
					       rsnd_dai_id(priv, rdai),
					       rsnd_dai_is_play(rdai, io));
		if (!mod)
			return 0;
		ssi_id = scu_id = rsnd_mod_id(mod);
	}

	ret = 0;

	/* SCU */
	if (scu_id >= 0) {
		mod = rsnd_scu_mod_get(priv, scu_id);
		ret = rsnd_dai_connect(mod, io);
		if (ret < 0)
			return ret;
	}

	/* SSI */
	if (ssi_id >= 0) {
		mod = rsnd_ssi_mod_get(priv, ssi_id);
		ret = rsnd_dai_connect(mod, io);
		if (ret < 0)
			return ret;
	}

	return ret;
}

static int rsnd_path_exit(struct rsnd_priv *priv,
			  struct rsnd_dai *rdai,
			  struct rsnd_dai_stream *io)
{
	struct rsnd_mod *mod;
	int ret = 0, i;

	/*
	 * remove all mod from rdai
	 */
	for (i = 0; i < RSND_MOD_MAX; i++) {
		mod = io->mod[i];
		if (!mod)
			continue;
		ret |= rsnd_dai_disconnect(mod, io);
	}

	return ret;
}

static int rsnd_dai_probe(struct platform_device *pdev,
			  struct rsnd_priv *priv)
{
	struct snd_soc_dai_driver *drv;
	struct rcar_snd_info *info = rsnd_priv_to_info(priv);
	struct rsnd_dai *rdai;
	struct rsnd_mod *pmod, *cmod;
	struct device *dev = rsnd_priv_to_dev(priv);
	int dai_nr = info->dai_info_nr;
	int i;

	/*
	 * dai_nr should be set via dai_info_nr,
	 * but allow it to keeping compatible
	 */
	if (!dai_nr) {
		/* get max dai nr */
		for (dai_nr = 0; dai_nr < 32; dai_nr++) {
			pmod = rsnd_ssi_mod_get_frm_dai(priv, dai_nr, 1);
			cmod = rsnd_ssi_mod_get_frm_dai(priv, dai_nr, 0);

			if (!pmod && !cmod)
				break;
		}
	}

	if (!dai_nr) {
		dev_err(dev, "no dai\n");
		return -EIO;
	}

	drv  = devm_kzalloc(dev, sizeof(*drv)  * dai_nr, GFP_KERNEL);
	rdai = devm_kzalloc(dev, sizeof(*rdai) * dai_nr, GFP_KERNEL);
	if (!drv || !rdai) {
		dev_err(dev, "dai allocate failed\n");
		return -ENOMEM;
	}

	priv->rdai_nr	= dai_nr;
	priv->daidrv	= drv;
	priv->rdai	= rdai;

	for (i = 0; i < dai_nr; i++) {
		if (info->dai_info)
			rdai[i].info = &info->dai_info[i];

		pmod = rsnd_ssi_mod_get_frm_dai(priv, i, 1);
		cmod = rsnd_ssi_mod_get_frm_dai(priv, i, 0);

		/*
		 *	init rsnd_dai
		 */
		snprintf(rdai[i].name, RSND_DAI_NAME_SIZE, "rsnd-dai.%d", i);

		/*
		 *	init snd_soc_dai_driver
		 */
		drv[i].name	= rdai[i].name;
		drv[i].ops	= &rsnd_soc_dai_ops;
		if (pmod) {
			drv[i].playback.rates		= RSND_RATES;
			drv[i].playback.formats		= RSND_FMTS;
			drv[i].playback.channels_min	= 2;
			drv[i].playback.channels_max	= 2;

			if (info->dai_info)
				rdai[i].playback.info = &info->dai_info[i].playback;
			rsnd_path_init(priv, &rdai[i], &rdai[i].playback);
		}
		if (cmod) {
			drv[i].capture.rates		= RSND_RATES;
			drv[i].capture.formats		= RSND_FMTS;
			drv[i].capture.channels_min	= 2;
			drv[i].capture.channels_max	= 2;

			if (info->dai_info)
				rdai[i].capture.info = &info->dai_info[i].capture;
			rsnd_path_init(priv, &rdai[i], &rdai[i].capture);
		}

		dev_dbg(dev, "%s (%s/%s)\n", rdai[i].name,
			pmod ? "play"    : " -- ",
			cmod ? "capture" : "  --   ");
	}

	return 0;
}

static void rsnd_dai_remove(struct platform_device *pdev,
			  struct rsnd_priv *priv)
{
	struct rsnd_dai *rdai;
	int i;

	for (i = 0; i < rsnd_rdai_nr(priv); i++) {
		rdai = rsnd_dai_get(priv, i);
		rsnd_path_exit(priv, rdai, &rdai->playback);
		rsnd_path_exit(priv, rdai, &rdai->capture);
	}
}

/*
 *		pcm ops
 */
static struct snd_pcm_hardware rsnd_pcm_hardware = {
	.info =		SNDRV_PCM_INFO_INTERLEAVED	|
			SNDRV_PCM_INFO_MMAP		|
			SNDRV_PCM_INFO_MMAP_VALID	|
			SNDRV_PCM_INFO_PAUSE,
	.buffer_bytes_max	= 64 * 1024,
	.period_bytes_min	= 32,
	.period_bytes_max	= 8192,
	.periods_min		= 1,
	.periods_max		= 32,
	.fifo_size		= 256,
};

static int rsnd_pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	int ret = 0;

	snd_soc_set_runtime_hwparams(substream, &rsnd_pcm_hardware);

	ret = snd_pcm_hw_constraint_integer(runtime,
					    SNDRV_PCM_HW_PARAM_PERIODS);

	return ret;
}

static int rsnd_hw_params(struct snd_pcm_substream *substream,
			 struct snd_pcm_hw_params *hw_params)
{
	return snd_pcm_lib_malloc_pages(substream,
					params_buffer_bytes(hw_params));
}

static snd_pcm_uframes_t rsnd_pointer(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_dai *dai = rsnd_substream_to_dai(substream);
	struct rsnd_dai *rdai = rsnd_dai_to_rdai(dai);
	struct rsnd_dai_stream *io = rsnd_rdai_to_io(rdai, substream);

	return bytes_to_frames(runtime, io->byte_pos);
}

static struct snd_pcm_ops rsnd_pcm_ops = {
	.open		= rsnd_pcm_open,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= rsnd_hw_params,
	.hw_free	= snd_pcm_lib_free_pages,
	.pointer	= rsnd_pointer,
};

/*
 *		snd_soc_platform
 */

#define PREALLOC_BUFFER		(32 * 1024)
#define PREALLOC_BUFFER_MAX	(32 * 1024)

static int rsnd_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
	return snd_pcm_lib_preallocate_pages_for_all(
		rtd->pcm,
		SNDRV_DMA_TYPE_DEV,
		rtd->card->snd_card->dev,
		PREALLOC_BUFFER, PREALLOC_BUFFER_MAX);
}

static void rsnd_pcm_free(struct snd_pcm *pcm)
{
	snd_pcm_lib_preallocate_free_for_all(pcm);
}

static struct snd_soc_platform_driver rsnd_soc_platform = {
	.ops		= &rsnd_pcm_ops,
	.pcm_new	= rsnd_pcm_new,
	.pcm_free	= rsnd_pcm_free,
};

static const struct snd_soc_component_driver rsnd_soc_component = {
	.name		= "rsnd",
};

/*
 *	rsnd probe
 */
static int rsnd_probe(struct platform_device *pdev)
{
	struct rcar_snd_info *info;
	struct rsnd_priv *priv;
	struct device *dev = &pdev->dev;
	struct rsnd_dai *rdai;
	int (*probe_func[])(struct platform_device *pdev,
			    struct rsnd_priv *priv) = {
		rsnd_gen_probe,
		rsnd_ssi_probe,
		rsnd_scu_probe,
		rsnd_adg_probe,
		rsnd_dai_probe,
	};
	int ret, i;

	info = pdev->dev.platform_data;
	if (!info) {
		dev_err(dev, "driver needs R-Car sound information\n");
		return -ENODEV;
	}

	/*
	 *	init priv data
	 */
	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv) {
		dev_err(dev, "priv allocate failed\n");
		return -ENODEV;
	}

	priv->dev	= dev;
	priv->info	= info;
	spin_lock_init(&priv->lock);

	/*
	 *	init each module
	 */
	for (i = 0; i < ARRAY_SIZE(probe_func); i++) {
		ret = probe_func[i](pdev, priv);
		if (ret)
			return ret;
	}

	for_each_rsnd_dai(rdai, priv, i) {
		ret = rsnd_dai_call(rdai, &rdai->playback, probe);
		if (ret)
			return ret;

		ret = rsnd_dai_call(rdai, &rdai->capture, probe);
		if (ret)
			return ret;
	}

	/*
	 *	asoc register
	 */
	ret = snd_soc_register_platform(dev, &rsnd_soc_platform);
	if (ret < 0) {
		dev_err(dev, "cannot snd soc register\n");
		return ret;
	}

	ret = snd_soc_register_component(dev, &rsnd_soc_component,
					 priv->daidrv, rsnd_rdai_nr(priv));
	if (ret < 0) {
		dev_err(dev, "cannot snd dai register\n");
		goto exit_snd_soc;
	}

	dev_set_drvdata(dev, priv);

	pm_runtime_enable(dev);

	dev_info(dev, "probed\n");
	return ret;

exit_snd_soc:
	snd_soc_unregister_platform(dev);

	return ret;
}

static int rsnd_remove(struct platform_device *pdev)
{
	struct rsnd_priv *priv = dev_get_drvdata(&pdev->dev);
	struct rsnd_dai *rdai;
	int ret, i;

	pm_runtime_disable(&pdev->dev);

	for_each_rsnd_dai(rdai, priv, i) {
		ret = rsnd_dai_call(rdai, &rdai->playback, remove);
		if (ret)
			return ret;

		ret = rsnd_dai_call(rdai, &rdai->capture, remove);
		if (ret)
			return ret;
	}

	/*
	 *	remove each module
	 */
	rsnd_ssi_remove(pdev, priv);
	rsnd_adg_remove(pdev, priv);
	rsnd_scu_remove(pdev, priv);
	rsnd_dai_remove(pdev, priv);
	rsnd_gen_remove(pdev, priv);

	return 0;
}

static struct platform_driver rsnd_driver = {
	.driver	= {
		.name	= "rcar_sound",
	},
	.probe		= rsnd_probe,
	.remove		= rsnd_remove,
};
module_platform_driver(rsnd_driver);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Renesas R-Car audio driver");
MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
MODULE_ALIAS("platform:rcar-pcm-audio");