path: root/sound/soc/sh/rcar/core.c

/*
 * 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 src
 *   |
 *   +- src
 *      |
 *      +- src[0]
 *      +- src[1]
 *      +- src[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)

static struct rsnd_of_data rsnd_of_data_gen1 = {
	.flags = RSND_GEN1,
};

static struct rsnd_of_data rsnd_of_data_gen2 = {
	.flags = RSND_GEN2,
};

static struct of_device_id rsnd_of_match[] = {
	{ .compatible = "renesas,rcar_sound-gen1", .data = &rsnd_of_data_gen1 },
	{ .compatible = "renesas,rcar_sound-gen2", .data = &rsnd_of_data_gen2 },
	{},
};
MODULE_DEVICE_TABLE(of, rsnd_of_match);

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

	rsnd_unlock(priv, flags);

	rsnd_dai_pointer_update(io, io->byte_per_period);
}

static void __rsnd_dma_start(struct rsnd_dma *dma)
{
	struct rsnd_mod *mod = rsnd_dma_to_mod