/*
 * Renesas R-Car Gen1 SRU/SSI support
 *
 * Copyright (C) 2013 Renesas Solutions Corp.
 * Kuninori Morimoto <kuninori.morimoto.gx@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.
 */
#include "rsnd.h"

struct rsnd_gen {
	void __iomem *base[RSND_BASE_MAX];

	struct rsnd_gen_ops *ops;

	struct regmap *regmap;
	struct regmap_field *regs[RSND_REG_MAX];
};

#define rsnd_priv_to_gen(p)	((struct rsnd_gen *)(p)->gen)

#define RSND_REG_SET(gen, id, reg_id, offset, _id_offset, _id_size)	\
	[id] = {							\
		.reg = (unsigned int)gen->base[reg_id] + offset,	\
		.lsb = 0,						\
		.msb = 31,						\
		.id_size = _id_size,					\
		.id_offset = _id_offset,				\
	}

/*
 *		basic function
 */
static int rsnd_regmap_write32(void *context, const void *_data, size_t count)
{
	struct rsnd_priv *priv = context;
	struct device *dev = rsnd_priv_to_dev(priv);
	u32 *data = (u32 *)_data;
	u32 val = data[1];
	void __iomem *reg = (void *)data[0];

	iowrite32(val, reg);

	dev_dbg(dev, "w %p : %08x\n", reg, val);

	return 0;
}

static int rsnd_regmap_read32(void *context,
			      const void *_data, size_t reg_size,
			      void *_val, size_t val_size)
{
	struct rsnd_priv *priv = context;
	struct device *dev = rsnd_priv_to_dev(priv);
	u32 *data = (u32 *)_data;
	u32 *val = (u32 *)_val;
	void __iomem *reg = (void *)data[0];

	*val = ioread32(reg);

	dev_dbg(dev, "r %p : %08x\n", reg, *val);

	return 0;
}

static struct regmap_bus rsnd_regmap_bus = {
	.write				= rsnd_regmap_write32,
	.read				= rsnd_regmap_read32,
	.reg_format_endian_default	= REGMAP_ENDIAN_NATIVE,
	.val_format_endian_default	= REGMAP_ENDIAN_NATIVE,
};

static int rsnd_is_accessible_reg(struct rsnd_priv *priv,
				  struct rsnd_gen *gen, enum rsnd_reg reg)
{
	if (!gen->regs[reg]) {
		struct device *dev = rsnd_priv_to_dev(priv);

		dev_err(dev, "unsupported register access %x\n", reg);
		return 0;
	}

	return 1;
}

u32 rsnd_read(struct rsnd_priv *priv,
	      struct rsnd_mod *mod, enum rsnd_reg reg)
{
	struct rsnd_gen *gen = rsnd_priv_to_gen(priv);
	u32 val;

	if (!rsnd_is_accessible_reg(priv, gen, reg))
		return 0;

	regmap_fields_read(gen->regs[reg], rsnd_mod_id(mod), &val);

	return val;
}

void rsnd_write(struct rsnd_priv *priv,
		struct rsnd_mod *mod,
		enum rsnd_reg reg, u32 data)
{
	struct rsnd_gen *gen = rsnd_priv_to_gen(priv);

	if (!rsnd_is_accessible_reg(priv, gen, reg))
		return;

	regmap_fields_write(gen->regs[reg], rsnd_mod_id(mod), data);
}

void rsnd_bset(struct rsnd_priv *priv, struct rsnd_mod *mod,
	       enum rsnd_reg reg, u32 mask, u32 data)
{
	struct rsnd_gen *gen = rsnd_priv_to_gen(priv);

	if (!rsnd_is_accessible_reg(priv, gen, reg))
		return;

	regmap_fields_update_bits(gen->regs[reg], rsnd_mod_id(mod),
				  mask, data);
}

static int rsnd_gen_regmap_init(struct rsnd_priv *priv,
				struct rsnd_gen  *gen,
				struct reg_field *regf)
{
	int i;
	struct device *dev = rsnd_priv_to_dev(priv);
	struct regmap_config regc;

	memset(&regc, 0, sizeof(regc));
	regc.reg_bits = 32;
	regc.val_bits = 32;

	gen->regmap = devm_regmap_init(dev, &rsnd_regmap_bus, priv, &regc);
	if (IS_ERR(gen->regmap)) {
		dev_err(dev, "regmap error %ld\n", PTR_ERR(gen->regmap));
		return PTR_ERR(gen->regmap);
	}

	for (i = 0; i < RSND_REG_MAX; i++) {
		gen->regs[i] = NULL;
		if (!regf[i].reg)
			continue;

		gen->regs[i] = devm_regmap_field_alloc(dev, gen->regmap, regf[i]);
		if (IS_ERR(gen->regs[i]))
			return PTR_ERR(gen->regs[i]);

	}

	return 0;
}

int rsnd_gen_path_init(struct rsnd_priv *priv,
		       struct rsnd_dai *rdai,
		       struct rsnd_dai_stream *io)
{
	struct rsnd_mod *mod;
	int ret;
	int id;

	/*
	 * 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.
	 *
	 * Then, SSI id = SCU id here
	 */

	/* get SSI's ID */
	mod = rsnd_ssi_mod_get_frm_dai(priv,
				       rsnd_dai_id(priv, rdai),
				       rsnd_dai_is_play(rdai, io));
	id = rsnd_mod_id(mod);

	/* SSI */
	mod = rsnd_ssi_mod_get(priv, id);
	ret = rsnd_dai_connect(rdai, mod, io);
	if (ret < 0)
		return ret;

	/* SCU */
	mod = rsnd_scu_mod_get(priv, id);
	ret = rsnd_dai_connect(rdai, mod, io);

	return ret;
}

int rsnd_gen_path_exit(struct rsnd_priv *priv,
		       struct rsnd_dai *rdai,
		       struct rsnd_dai_stream *io)
{
	struct rsnd_mod *mod, *n;
	int ret = 0;

	/*
	 * remove all mod from rdai
	 */
	for_each_rsnd_mod(mod, n, io)
		ret |= rsnd_dai_disconnect(mod);

	return ret;
}

/*
 *		Gen2
 */

/* single address mapping */
#define RSND_GEN2_S_REG(gen, reg, id, offset)				\
	RSND_REG_SET(gen, RSND_REG_##id, RSND_GEN2_##reg, offset, 0, 10)

/* multi address mapping */
#define RSND_GEN2_M_REG(gen, reg, id, offset, _id_offset)		\
	RSND_REG_SET(gen, RSND_REG_##id, RSND_GEN2_##reg, offset, _id_offset, 10)

static int rsnd_gen2_regmap_init(struct rsnd_priv *priv, struct rsnd_gen *gen)
{
	struct reg_field regf[RSND_REG_MAX] = {
		RSND_GEN2_S_REG(gen, SSIU,	SSI_MODE0,	0x800),
		RSND_GEN2_S_REG(gen, SSIU,	SSI_MODE1,	0x804),
		/* FIXME: it needs SSI_MODE2/3 in the future */
		RSND_GEN2_M_REG(gen, SSIU,	INT_ENABLE,	0x18,	0x80),

		RSND_GEN2_S_REG(gen, ADG,	BRRA,		0x00),
		RSND_GEN2_S_REG(gen, ADG,	BRRB,		0x04),
		RSND_GEN2_S_REG(gen, ADG,	SSICKR,		0x08),
		RSND_GEN2_S_REG(gen, ADG,	AUDIO_CLK_SEL0,	0x0c),
		RSND_GEN2_S_REG(gen, ADG,	AUDIO_CLK_SEL1,	0x10),
		RSND_GEN2_S_REG(gen, ADG,	AUDIO_CLK_SEL2,	0x14),

		RSND_GEN2_M_REG(gen, SSI,	SSICR,		0x00,	0x40),
		RSND_GEN2_M_REG(gen, SSI,	SSISR,		0x04,	0x40),
		RSND_GEN2_M_REG(gen, SSI,	SSITDR,		0x08,	0x40),
		RSND_GEN2_M_REG(gen, SSI,	SSIRDR,		0x0c,	0x40),
		RSND_GEN2_M_REG(gen, SSI,	SSIWSR,		0x20,	0x40),
	};

	return rsnd_gen_regmap_init(priv, gen, regf);
}

static int rsnd_gen2_probe(struct platform_device *pdev,
			   struct rcar_snd_info *info,
			   struct rsnd_priv *priv)
{
	struct device *dev = rsnd_priv_to_dev(priv);
	struct rsnd_gen *gen = rsnd_priv_to_gen(priv);
	struct resource *scu_res;
	struct resource *adg_res;
	struct resource *ssiu_res;
	struct resource *ssi_res;
	int ret;

	/*
	 * map address
	 */
	scu_res  = platform_get_resource(pdev, IORESOURCE_MEM, RSND_GEN2_SCU);
	adg_res  = platform_get_resource(pdev, IORESOURCE_MEM, RSND_GEN2_ADG);
	ssiu_res = platform_get_resource(pdev, IORESOURCE_MEM, RSND_GEN2_SSIU);
	ssi_res  = platform_get_resource(pdev, IORESOURCE_MEM, RSND_GEN2_SSI);

	gen->base[RSND_GEN2_SCU]  = devm_ioremap_resource(dev, scu_res);
	gen->base[RSND_GEN2_ADG]  = devm_ioremap_resource(dev, adg_res);
	gen->base[RSND_GEN2_SSIU] = devm_ioremap_resource(dev, ssiu_res);
	gen->base[RSND_GEN2_SSI]  = devm_ioremap_resource(dev, ssi_res);
	if (IS_ERR(gen->base[RSND_GEN2_SCU])  ||
	    IS_ERR(gen->base[RSND_GEN2_ADG])  ||
	    IS_ERR(gen->base[RSND_GEN2_SSIU]) ||
	    IS_ERR(gen->base[RSND_GEN2_SSI]))
		return -ENODEV;

	ret = rsnd_gen2_regmap_init(priv, gen);
	if (ret < 0)
		return ret;

	dev_dbg(dev, "Gen2 device probed\n");
	dev_dbg(dev, "SRU  : %08x => %p\n", scu_res->start,
		gen->base[RSND_GEN2_SCU]);
	dev_dbg(dev, "ADG  : %08x => %p\n", adg_res->start,
		gen->base[RSND_GEN2_ADG]);
	dev_dbg(dev, "SSIU : %08x => %p\n", ssiu_res->start,
		gen->base[RSND_GEN2_SSIU]);
	dev_dbg(dev, "SSI  : %08x => %p\n", ssi_res->start,
		gen->base[RSND_GEN2_SSI]);

	return 0;
}

/*
 *		Gen1
 */

/* single address mapping */
#define RSND_GEN1_S_REG(gen, reg, id, offset)	\
	RSND_REG_SET(gen, RSND_REG_##id, RSND_GEN1_##reg, offset, 0, 9)

/* multi address mapping */
#define RSND_GEN1_M_REG(gen, reg, id, offset, _id_offset)	\
	RSND_REG_SET(gen, RSND_REG_##id, RSND_GEN1_##reg, offset, _id_offset, 9)

static int rsnd_gen1_regmap_init(struct rsnd_priv *priv, struct rsnd_gen *gen)
{
	struct reg_field regf[RSND_REG_MAX] = {
		RSND_GEN1_S_REG(gen, SRU,	SRC_ROUTE_SEL,	0x00),
		RSND_GEN1_S_REG(gen, SRU,	SRC_TMG_SEL0,	0x08),
		RSND_GEN1_S_REG(gen, SRU,	SRC_TMG_SEL1,	0x0c),
		RSND_GEN1_S_REG(gen, SRU,	SRC_TMG_SEL2,	0x10),
		RSND_GEN1_S_REG(gen, SRU,	SRC_ROUTE_CTRL,	0xc0),
		RSND_GEN1_S_REG(gen, SRU,	SSI_MODE0,	0xD0),
		RSND_GEN1_S_REG(gen, SRU,	SSI_MODE1,	0xD4),
		RSND_GEN1_M_REG(gen, SRU,	BUSIF_MODE,	0x20,	0x4),
		RSND_GEN1_M_REG(gen, SRU,	SRC_ADINR,	0x214,	0x40),

		RSND_GEN1_S_REG(gen, ADG,	BRRA,		0x00),
		RSND_GEN1_S_REG(gen, ADG,	BRRB,		0x04),
		RSND_GEN1_S_REG(gen, ADG,	SSICKR,		0x08),
		RSND_GEN1_S_REG(gen, ADG,	AUDIO_CLK_SEL0,	0x0c),
		RSND_GEN1_S_REG(gen, ADG,	AUDIO_CLK_SEL1,	0x10),

		RSND_GEN1_M_REG(gen, SSI,	SSICR,		0x00,	0x40),
		RSND_GEN1_M_REG(gen, SSI,	SSISR,		0x04,	0x40),
		RSND_GEN1_M_REG(gen, SSI,	SSITDR,		0x08,	0x40),
		RSND_GEN1_M_REG(gen, SSI,	SSIRDR,		0x0c,	0x40),
		RSND_GEN1_M_REG(gen, SSI,	SSIWSR,		0x20,	0x40),
	};

	return rsnd_gen_regmap_init(priv, gen, regf);
}

static int rsnd_gen1_probe(struct platform_device *pdev,
			   struct rcar_snd_info *info,
			   struct rsnd_priv *priv)
{
	struct device *dev = rsnd_priv_to_dev(priv);
	struct rsnd_gen *gen = rsnd_priv_to_gen(priv);
	struct resource *sru_res;
	struct resource *adg_res;
	struct resource *ssi_res;
	int ret;

	/*
	 * map address
	 */
	sru_res	= platform_get_resource(pdev, IORESOURCE_MEM, RSND_GEN1_SRU);
	adg_res = platform_get_resource(pdev, IORESOURCE_MEM, RSND_GEN1_ADG);
	ssi_res	= platform_get_resource(pdev, IORESOURCE_MEM, RSND_GEN1_SSI);

	gen->base[RSND_GEN1_SRU] = devm_ioremap_resource(dev, sru_res);
	gen->base[RSND_GEN1_ADG] = devm_ioremap_resource(dev, adg_res);
	gen->base[RSND_GEN1_SSI] = devm_ioremap_resource(dev, ssi_res);
	if (IS_ERR(gen->base[RSND_GEN1_SRU]) ||
	    IS_ERR(gen->base[RSND_GEN1_ADG]) ||
	    IS_ERR(gen->base[RSND_GEN1_SSI]))
		return -ENODEV;

	ret = rsnd_gen1_regmap_init(priv, gen);
	if (ret < 0)
		return ret;

	dev_dbg(dev, "Gen1 device probed\n");
	dev_dbg(dev, "SRU : %08x => %p\n",	sru_res->start,
						gen->base[RSND_GEN1_SRU]);
	dev_dbg(dev, "ADG : %08x => %p\n",	adg_res->start,
						gen->base[RSND_GEN1_ADG]);
	dev_dbg(dev, "SSI : %08x => %p\n",	ssi_res->start,
						gen->base[RSND_GEN1_SSI]);

	return 0;

}

/*
 *		Gen
 */
int rsnd_gen_probe(struct platform_device *pdev,
		   struct rcar_snd_info *info,
		   struct rsnd_priv *priv)
{
	struct device *dev = rsnd_priv_to_dev(priv);
	struct rsnd_gen *gen;
	int ret;

	gen = devm_kzalloc(dev, sizeof(*gen), GFP_KERNEL);
	if (!gen) {
		dev_err(dev, "GEN allocate failed\n");
		return -ENOMEM;
	}

	priv->gen = gen;

	ret = -ENODEV;
	if (rsnd_is_gen1(priv))
		ret = rsnd_gen1_probe(pdev, info, priv);
	else if (rsnd_is_gen2(priv))
		ret = rsnd_gen2_probe(pdev, info, priv);

	if (ret < 0)
		dev_err(dev, "unknown generation R-Car sound device\n");

	return ret;
}

void rsnd_gen_remove(struct platform_device *pdev,
		     struct rsnd_priv *priv)
{
}