ASoC: add Renesas R-Car SCU feature

Renesas R-Car series sound circuit consists of SSI and its peripheral.
But this peripheral circuit is different between
R-Car Generation1 (E1/M1/H1) and Generation2 (E2/M2/H2)
(Actually, there are many difference in Generation1 chips)

This patch adds SCU feature on this driver.
But, it defines SCU style only, does nothing at this point.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

include/sound/rcar_snd.h

@@ -14,8 +14,15 @@
 
 #include <linux/sh_clk.h>
 
+#define RSND_GEN1_SRU	0
 
-#define RSND_BASE_MAX	0
+#define RSND_GEN2_SRU	0
+
+#define RSND_BASE_MAX	1
+
+struct rsnd_scu_platform_info {
+	u32 flags;
+};
 
 struct rsnd_dai_platform_info {
 	int ssi_id_playback;
@@ -34,6 +41,8 @@ struct rsnd_dai_platform_info {
 
 struct rcar_snd_info {
 	u32 flags;
+	struct rsnd_scu_platform_info *scu_info;
+	int scu_info_nr;
 	struct rsnd_dai_platform_info *dai_info;
 	int dai_info_nr;
 	int (*start)(int id);

sound/soc/sh/rcar/Makefile

@@ -1,2 +1,2 @@
-snd-soc-rcar-objs	:= core.o gen.o
+snd-soc-rcar-objs	:= core.o gen.o scu.o
-obj-$(CONFIG_SND_SOC_RCAR)	+= snd-soc-rcar.o
+obj-$(CONFIG_SND_SOC_RCAR)	+= snd-soc-rcar.o

sound/soc/sh/rcar/core.c

@@ -631,6 +631,10 @@ static int rsnd_probe(struct platform_device *pdev)
 	if (ret < 0)
 		return ret;
 
+	ret = rsnd_scu_probe(pdev, info, priv);
+	if (ret < 0)
+		return ret;
+
 	/*
 	 *	asoc register
 	 */
@@ -669,6 +673,7 @@ static int rsnd_remove(struct platform_device *pdev)
 	/*
 	 *	remove each module
 	 */
+	rsnd_scu_remove(pdev, priv);
 	rsnd_dai_remove(pdev, priv);
 	rsnd_gen_remove(pdev, priv);
 

sound/soc/sh/rcar/gen.c

@@ -45,10 +45,105 @@ struct rsnd_gen {
 /*
  *		Gen1
  */
+static int rsnd_gen1_path_init(struct rsnd_priv *priv,
+			       struct rsnd_dai *rdai,
+			       struct rsnd_dai_stream *io)
+{
+	struct rsnd_dai_platform_info *info = rsnd_dai_get_platform_info(rdai);
+	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
+	 */
+
+	if (rsnd_dai_is_play(rdai, io))
+		id = info->ssi_id_playback;
+	else
+		id = info->ssi_id_capture;
+
+	/* SCU */
+	mod = rsnd_scu_mod_get(priv, id);
+	ret = rsnd_dai_connect(rdai, mod, io);
+
+	return ret;
+}
+
+static int rsnd_gen1_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;
+}
+
+static struct rsnd_gen_ops rsnd_gen1_ops = {
+	.path_init	= rsnd_gen1_path_init,
+	.path_exit	= rsnd_gen1_path_exit,
+};
+
+#define RSND_GEN1_REG_MAP(g, s, i, oi, oa)				\
+	do {								\
+		(g)->reg_map[RSND_REG_##i].index  = RSND_GEN1_##s;	\
+		(g)->reg_map[RSND_REG_##i].offset_id = oi;		\
+		(g)->reg_map[RSND_REG_##i].offset_adr = oa;		\
+	} while (0)
+
+static void rsnd_gen1_reg_map_init(struct rsnd_gen *gen)
+{
+	RSND_GEN1_REG_MAP(gen, SRU,	SSI_MODE0,	0x0,	0xD0);
+	RSND_GEN1_REG_MAP(gen, SRU,	SSI_MODE1,	0x0,	0xD4);
+}
+
 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;
+
+	/*
+	 * map address
+	 */
+	sru_res	= platform_get_resource(pdev, IORESOURCE_MEM, RSND_GEN1_SRU);
+	if (!sru_res) {
+		dev_err(dev, "Not enough SRU/SSI/ADG platform resources.\n");
+		return -ENODEV;
+	}
+
+	gen->ops = &rsnd_gen1_ops;
+
+	gen->base[RSND_GEN1_SRU] = devm_ioremap_resource(dev, sru_res);
+	if (!gen->base[RSND_GEN1_SRU]) {
+		dev_err(dev, "SRU/SSI/ADG ioremap failed\n");
+		return -ENODEV;
+	}
+
+	rsnd_gen1_reg_map_init(gen);
+
+	dev_dbg(dev, "Gen1 device probed\n");
+	dev_dbg(dev, "SRU : %08x => %p\n",	sru_res->start,
+						gen->base[RSND_GEN1_SRU]);
+
 	return 0;
 }
 

sound/soc/sh/rcar/rsnd.h

@@ -28,6 +28,10 @@
  * see gen1/gen2 for detail
  */
 enum rsnd_reg {
+	/* SRU/SCU */
+	RSND_REG_SSI_MODE0,
+	RSND_REG_SSI_MODE1,
+
 	RSND_REG_MAX,
 };
 
@@ -172,6 +176,12 @@ struct rsnd_priv {
 	 */
 	void *gen;
 
+	/*
+	 * below value will be filled on rsnd_scu_probe()
+	 */
+	void *scu;
+	int scu_nr;
+
 	/*
 	 * below value will be filled on rsnd_dai_probe()
 	 */
@@ -184,4 +194,15 @@ struct rsnd_priv {
 #define rsnd_lock(priv, flags) spin_lock_irqsave(&priv->lock, flags)
 #define rsnd_unlock(priv, flags) spin_unlock_irqrestore(&priv->lock, flags)
 
+/*
+ *	R-Car SCU
+ */
+int rsnd_scu_probe(struct platform_device *pdev,
+		   struct rcar_snd_info *info,
+		   struct rsnd_priv *priv);
+void rsnd_scu_remove(struct platform_device *pdev,
+		     struct rsnd_priv *priv);
+struct rsnd_mod *rsnd_scu_mod_get(struct rsnd_priv *priv, int id);
+#define rsnd_scu_nr(priv) ((priv)->scu_nr)
+
 #endif

sound/soc/sh/rcar/scu.c

@@ -0,0 +1,125 @@
+/*
+ * Renesas R-Car SCU 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_scu {
+	struct rsnd_scu_platform_info *info; /* rcar_snd.h */
+	struct rsnd_mod mod;
+};
+
+#define rsnd_mod_to_scu(_mod)	\
+	container_of((_mod), struct rsnd_scu, mod)
+
+#define for_each_rsnd_scu(pos, priv, i)					\
+	for ((i) = 0;							\
+	     ((i) < rsnd_scu_nr(priv)) &&				\
+		     ((pos) = (struct rsnd_scu *)(priv)->scu + i);	\
+	     i++)
+
+static int rsnd_scu_init(struct rsnd_mod *mod,
+			 struct rsnd_dai *rdai,
+			 struct rsnd_dai_stream *io)
+{
+	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
+	struct device *dev = rsnd_priv_to_dev(priv);
+
+	dev_dbg(dev, "%s.%d init\n", rsnd_mod_name(mod), rsnd_mod_id(mod));
+
+	return 0;
+}
+
+static int rsnd_scu_quit(struct rsnd_mod *mod,
+			 struct rsnd_dai *rdai,
+			 struct rsnd_dai_stream *io)
+{
+	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
+	struct device *dev = rsnd_priv_to_dev(priv);
+
+	dev_dbg(dev, "%s.%d quit\n", rsnd_mod_name(mod), rsnd_mod_id(mod));
+
+	return 0;
+}
+
+static int rsnd_scu_start(struct rsnd_mod *mod,
+			  struct rsnd_dai *rdai,
+			  struct rsnd_dai_stream *io)
+{
+	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
+	struct device *dev = rsnd_priv_to_dev(priv);
+
+	dev_dbg(dev, "%s.%d start\n", rsnd_mod_name(mod), rsnd_mod_id(mod));
+
+	return 0;
+}
+
+static int rsnd_scu_stop(struct rsnd_mod *mod,
+			 struct rsnd_dai *rdai,
+			 struct rsnd_dai_stream *io)
+{
+	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
+	struct device *dev = rsnd_priv_to_dev(priv);
+
+	dev_dbg(dev, "%s.%d stop\n", rsnd_mod_name(mod), rsnd_mod_id(mod));
+
+	return 0;
+}
+
+static struct rsnd_mod_ops rsnd_scu_ops = {
+	.name	= "scu",
+	.init	= rsnd_scu_init,
+	.quit	= rsnd_scu_quit,
+	.start	= rsnd_scu_start,
+	.stop	= rsnd_scu_stop,
+};
+
+struct rsnd_mod *rsnd_scu_mod_get(struct rsnd_priv *priv, int id)
+{
+	BUG_ON(id < 0 || id >= rsnd_scu_nr(priv));
+
+	return &((struct rsnd_scu *)(priv->scu) + id)->mod;
+}
+
+int rsnd_scu_probe(struct platform_device *pdev,
+		   struct rcar_snd_info *info,
+		   struct rsnd_priv *priv)
+{
+	struct device *dev = rsnd_priv_to_dev(priv);
+	struct rsnd_scu *scu;
+	int i, nr;
+
+	/*
+	 * init SCU
+	 */
+	nr	= info->scu_info_nr;
+	scu	= devm_kzalloc(dev, sizeof(*scu) * nr, GFP_KERNEL);
+	if (!scu) {
+		dev_err(dev, "SCU allocate failed\n");
+		return -ENOMEM;
+	}
+
+	priv->scu_nr	= nr;
+	priv->scu	= scu;
+
+	for_each_rsnd_scu(scu, priv, i) {
+		rsnd_mod_init(priv, &scu->mod,
+			      &rsnd_scu_ops, i);
+		scu->info = &info->scu_info[i];
+	}
+
+	dev_dbg(dev, "scu probed\n");
+
+	return 0;
+}
+
+void rsnd_scu_remove(struct platform_device *pdev,
+		     struct rsnd_priv *priv)
+{
+}