ASoC: rsnd: add CTU (Channel Transfer Unit) prototype support

This patch adds CTU (Channel Transfer Unit) support for rsnd driver.
But, it does nothing to data at this point, but is required for MIX
support.

CTU design is a little different from other IPs (CTU0 is including
CTU00 - CTU03, and CTU1 is including CTU10 - CTU13, these have different
register mapping) We need to care about it on this driver.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: Keita Kobayashi <keita.kobayashi.ym@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/renesas,rsnd.txt

@@ -18,6 +18,9 @@ Required properties:
 - rcar_sound,src		: Should contain SRC feature.
 				  The number of SRC subnode should be same as HW.
 				  see below for detail.
+- rcar_sound,ctu		: Should contain CTU feature.
+				  The number of CTU subnode should be same as HW.
+				  see below for detail.
 - rcar_sound,dvc		: Should contain DVC feature.
 				  The number of DVC subnode should be same as HW.
 				  see below for detail.
@@ -90,6 +93,17 @@ rcar_sound: sound@ec500000 {
 		};
 	};
 
+	rcar_sound,ctu {
+		ctu00: ctu@0 { };
+		ctu01: ctu@1 { };
+		ctu02: ctu@2 { };
+		ctu03: ctu@3 { };
+		ctu10: ctu@4 { };
+		ctu11: ctu@5 { };
+		ctu12: ctu@6 { };
+		ctu13: ctu@7 { };
+	};
+
 	rcar_sound,src {
 		src0: src@0 {
 			interrupts = <0 352 IRQ_TYPE_LEVEL_HIGH>;

include/sound/rcar_snd.h

@@ -61,6 +61,10 @@ struct rsnd_src_platform_info {
 /*
  * flags
  */
+struct rsnd_ctu_platform_info {
+	u32 flags;
+};
+
 struct rsnd_dvc_platform_info {
 	u32 flags;
 };
@@ -68,6 +72,7 @@ struct rsnd_dvc_platform_info {
 struct rsnd_dai_path_info {
 	struct rsnd_ssi_platform_info *ssi;
 	struct rsnd_src_platform_info *src;
+	struct rsnd_ctu_platform_info *ctu;
 	struct rsnd_dvc_platform_info *dvc;
 };
 
@@ -93,6 +98,8 @@ struct rcar_snd_info {
 	int ssi_info_nr;
 	struct rsnd_src_platform_info *src_info;
 	int src_info_nr;
+	struct rsnd_ctu_platform_info *ctu_info;
+	int ctu_info_nr;
 	struct rsnd_dvc_platform_info *dvc_info;
 	int dvc_info_nr;
 	struct rsnd_dai_platform_info *dai_info;

sound/soc/sh/rcar/Makefile

@@ -1,4 +1,4 @@
-snd-soc-rcar-objs	:= core.o gen.o dma.o adg.o ssi.o src.o dvc.o
+snd-soc-rcar-objs	:= core.o gen.o dma.o adg.o ssi.o src.o ctu.o dvc.o
 obj-$(CONFIG_SND_SOC_RCAR)	+= snd-soc-rcar.o
 
 snd-soc-rsrc-card-objs	:= rsrc-card.o

sound/soc/sh/rcar/core.c

@@ -651,6 +651,11 @@ static int rsnd_path_init(struct rsnd_priv *priv,
 	if (ret < 0)
 		return ret;
 
+	/* CTU */
+	ret = rsnd_path_add(priv, io, ctu);
+	if (ret < 0)
+		return ret;
+
 	/* DVC */
 	ret = rsnd_path_add(priv, io, dvc);
 	if (ret < 0)
@@ -666,13 +671,14 @@ static void rsnd_of_parse_dai(struct platform_device *pdev,
 	struct device_node *dai_node,	*dai_np;
 	struct device_node *ssi_node,	*ssi_np;
 	struct device_node *src_node,	*src_np;
+	struct device_node *ctu_node,	*ctu_np;
 	struct device_node *dvc_node,	*dvc_np;
 	struct device_node *playback, *capture;
 	struct rsnd_dai_platform_info *dai_info;
 	struct rcar_snd_info *info = rsnd_priv_to_info(priv);
 	struct device *dev = &pdev->dev;
 	int nr, i;
-	int dai_i, ssi_i, src_i, dvc_i;
+	int dai_i, ssi_i, src_i, ctu_i, dvc_i;
 
 	if (!of_data)
 		return;
@@ -698,6 +704,7 @@ static void rsnd_of_parse_dai(struct platform_device *pdev,
 
 	ssi_node = of_get_child_by_name(dev->of_node, "rcar_sound,ssi");
 	src_node = of_get_child_by_name(dev->of_node, "rcar_sound,src");
+	ctu_node = of_get_child_by_name(dev->of_node, "rcar_sound,ctu");
 	dvc_node = of_get_child_by_name(dev->of_node, "rcar_sound,dvc");
 
 #define mod_parse(name)							\
@@ -734,6 +741,7 @@ if (name##_node) {							\
 
 			mod_parse(ssi);
 			mod_parse(src);
+			mod_parse(ctu);
 			mod_parse(dvc);
 
 			of_node_put(playback);
@@ -1146,6 +1154,7 @@ static int rsnd_probe(struct platform_device *pdev)
 		rsnd_dma_probe,
 		rsnd_ssi_probe,
 		rsnd_src_probe,
+		rsnd_ctu_probe,
 		rsnd_dvc_probe,
 		rsnd_adg_probe,
 		rsnd_dai_probe,
@@ -1241,6 +1250,7 @@ static int rsnd_remove(struct platform_device *pdev)
 			      struct rsnd_priv *priv) = {
 		rsnd_ssi_remove,
 		rsnd_src_remove,
+		rsnd_ctu_remove,
 		rsnd_dvc_remove,
 	};
 	int ret = 0, i;

sound/soc/sh/rcar/ctu.c

@@ -0,0 +1,171 @@
+/*
+ * ctu.c
+ *
+ * Copyright (c) 2015 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"
+
+#define CTU_NAME_SIZE	16
+#define CTU_NAME "ctu"
+
+struct rsnd_ctu {
+	struct rsnd_ctu_platform_info *info; /* rcar_snd.h */
+	struct rsnd_mod mod;
+};
+
+#define rsnd_ctu_nr(priv) ((priv)->ctu_nr)
+#define for_each_rsnd_ctu(pos, priv, i)					\
+	for ((i) = 0;							\
+	     ((i) < rsnd_ctu_nr(priv)) &&				\
+		     ((pos) = (struct rsnd_ctu *)(priv)->ctu + i);	\
+	     i++)
+
+#define rsnd_ctu_initialize_lock(mod)	__rsnd_ctu_initialize_lock(mod, 1)
+#define rsnd_ctu_initialize_unlock(mod)	__rsnd_ctu_initialize_lock(mod, 0)
+static void __rsnd_ctu_initialize_lock(struct rsnd_mod *mod, u32 enable)
+{
+	rsnd_mod_write(mod, CTU_CTUIR, enable);
+}
+
+static int rsnd_ctu_init(struct rsnd_mod *mod,
+			 struct rsnd_dai_stream *io,
+			 struct rsnd_priv *priv)
+{
+	rsnd_mod_hw_start(mod);
+
+	rsnd_ctu_initialize_lock(mod);
+
+	rsnd_mod_write(mod, CTU_ADINR, rsnd_get_adinr_chan(mod, io));
+
+	rsnd_ctu_initialize_unlock(mod);
+
+	return 0;
+}
+
+static int rsnd_ctu_quit(struct rsnd_mod *mod,
+			 struct rsnd_dai_stream *io,
+			 struct rsnd_priv *priv)
+{
+	rsnd_mod_hw_stop(mod);
+
+	return 0;
+}
+
+static struct rsnd_mod_ops rsnd_ctu_ops = {
+	.name		= CTU_NAME,
+	.init		= rsnd_ctu_init,
+	.quit		= rsnd_ctu_quit,
+};
+
+struct rsnd_mod *rsnd_ctu_mod_get(struct rsnd_priv *priv, int id)
+{
+	if (WARN_ON(id < 0 || id >= rsnd_ctu_nr(priv)))
+		id = 0;
+
+	return &((struct rsnd_ctu *)(priv->ctu) + id)->mod;
+}
+
+void rsnd_of_parse_ctu(struct platform_device *pdev,
+		       const struct rsnd_of_data *of_data,
+		       struct rsnd_priv *priv)
+{
+	struct device_node *node;
+	struct rsnd_ctu_platform_info *ctu_info;
+	struct rcar_snd_info *info = rsnd_priv_to_info(priv);
+	struct device *dev = &pdev->dev;
+	int nr;
+
+	if (!of_data)
+		return;
+
+	node = of_get_child_by_name(dev->of_node, "rcar_sound,ctu");
+	if (!node)
+		return;
+
+	nr = of_get_child_count(node);
+	if (!nr)
+		goto rsnd_of_parse_ctu_end;
+
+	ctu_info = devm_kzalloc(dev,
+				sizeof(struct rsnd_ctu_platform_info) * nr,
+				GFP_KERNEL);
+	if (!ctu_info) {
+		dev_err(dev, "ctu info allocation error\n");
+		goto rsnd_of_parse_ctu_end;
+	}
+
+	info->ctu_info		= ctu_info;
+	info->ctu_info_nr	= nr;
+
+rsnd_of_parse_ctu_end:
+	of_node_put(node);
+
+}
+
+int rsnd_ctu_probe(struct platform_device *pdev,
+		   const struct rsnd_of_data *of_data,
+		   struct rsnd_priv *priv)
+{
+	struct rcar_snd_info *info = rsnd_priv_to_info(priv);
+	struct device *dev = rsnd_priv_to_dev(priv);
+	struct rsnd_ctu *ctu;
+	struct clk *clk;
+	char name[CTU_NAME_SIZE];
+	int i, nr, ret;
+
+	/* This driver doesn't support Gen1 at this point */
+	if (rsnd_is_gen1(priv)) {
+		dev_warn(dev, "CTU is not supported on Gen1\n");
+		return -EINVAL;
+	}
+
+	rsnd_of_parse_ctu(pdev, of_data, priv);
+
+	nr = info->ctu_info_nr;
+	if (!nr)
+		return 0;
+
+	ctu = devm_kzalloc(dev, sizeof(*ctu) * nr, GFP_KERNEL);
+	if (!ctu)
+		return -ENOMEM;
+
+	priv->ctu_nr	= nr;
+	priv->ctu	= ctu;
+
+	for_each_rsnd_ctu(ctu, priv, i) {
+		/*
+		 * CTU00, CTU01, CTU02, CTU03 => CTU0
+		 * CTU10, CTU11, CTU12, CTU13 => CTU1
+		 */
+		snprintf(name, CTU_NAME_SIZE, "%s.%d",
+			 CTU_NAME, i / 4);
+
+		clk = devm_clk_get(dev, name);
+		if (IS_ERR(clk))
+			return PTR_ERR(clk);
+
+		ctu->info = &info->ctu_info[i];
+
+		ret = rsnd_mod_init(priv, &ctu->mod, &rsnd_ctu_ops,
+				    clk, RSND_MOD_CTU, i);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+void rsnd_ctu_remove(struct platform_device *pdev,
+		     struct rsnd_priv *priv)
+{
+	struct rsnd_ctu *ctu;
+	int i;
+
+	for_each_rsnd_ctu(ctu, priv, i) {
+		rsnd_mod_quit(&ctu->mod);
+	}
+}

sound/soc/sh/rcar/dma.c

@@ -426,7 +426,8 @@ rsnd_gen2_dma_addr(struct rsnd_dai_stream *io,
 	phys_addr_t src_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SCU);
 	int is_ssi = !!(rsnd_io_to_mod_ssi(io) == mod);
 	int use_src = !!rsnd_io_to_mod_src(io);
-	int use_dvc = !!rsnd_io_to_mod_dvc(io);
+	int use_cmd = !!rsnd_io_to_mod_dvc(io) ||
+		      !!rsnd_io_to_mod_ctu(io);
 	int id = rsnd_mod_id(mod);
 	struct dma_addr {
 		dma_addr_t out_addr;
@@ -464,7 +465,7 @@ rsnd_gen2_dma_addr(struct rsnd_dai_stream *io,
 	};
 
 	/* it shouldn't happen */
-	if (use_dvc && !use_src)
+	if (use_cmd && !use_src)
 		dev_err(dev, "DVC is selected without SRC\n");
 
 	/* use SSIU or SSI ? */
@@ -472,8 +473,8 @@ rsnd_gen2_dma_addr(struct rsnd_dai_stream *io,
 		is_ssi++;
 
 	return (is_from) ?
-		dma_addrs[is_ssi][is_play][use_src + use_dvc].out_addr :
-		dma_addrs[is_ssi][is_play][use_src + use_dvc].in_addr;
+		dma_addrs[is_ssi][is_play][use_src + use_cmd].out_addr :
+		dma_addrs[is_ssi][is_play][use_src + use_cmd].in_addr;
 }
 
 static dma_addr_t rsnd_dma_addr(struct rsnd_dai_stream *io,
@@ -504,6 +505,7 @@ static void rsnd_dma_of_path(struct rsnd_dma *dma,
 	struct rsnd_mod *this = rsnd_dma_to_mod(dma);
 	struct rsnd_mod *ssi = rsnd_io_to_mod_ssi(io);
 	struct rsnd_mod *src = rsnd_io_to_mod_src(io);
+	struct rsnd_mod *ctu = rsnd_io_to_mod_ctu(io);
 	struct rsnd_mod *dvc = rsnd_io_to_mod_dvc(io);
 	struct rsnd_mod *mod[MOD_MAX];
 	struct rsnd_mod *mod_start, *mod_end;
@@ -543,6 +545,9 @@ static void rsnd_dma_of_path(struct rsnd_dma *dma,
 		if (src) {
 			mod[i] = src;
 			src = NULL;
+		} else if (ctu) {
+			mod[i] = ctu;
+			ctu = NULL;
 		} else if (dvc) {
 			mod[i] = dvc;
 			dvc = NULL;

sound/soc/sh/rcar/gen.c

@@ -240,6 +240,8 @@ static int rsnd_gen2_probe(struct platform_device *pdev,
 		RSND_GEN_M_REG(SRC_SRCCR,	0x224,	0x40),
 		RSND_GEN_M_REG(SRC_BSDSR,	0x22c,	0x40),
 		RSND_GEN_M_REG(SRC_BSISR,	0x238,	0x40),
+		RSND_GEN_M_REG(CTU_CTUIR,	0x504,	0x100),
+		RSND_GEN_M_REG(CTU_ADINR,	0x508,	0x100),
 		RSND_GEN_M_REG(DVC_SWRSR,	0xe00,	0x100),
 		RSND_GEN_M_REG(DVC_DVUIR,	0xe04,	0x100),
 		RSND_GEN_M_REG(DVC_ADINR,	0xe08,	0x100),

sound/soc/sh/rcar/rsnd.h

@@ -47,6 +47,8 @@ enum rsnd_reg {
 	RSND_REG_SCU_SYS_STATUS0,
 	RSND_REG_SCU_SYS_INT_EN0,
 	RSND_REG_CMD_ROUTE_SLCT,
+	RSND_REG_CTU_CTUIR,
+	RSND_REG_CTU_ADINR,
 	RSND_REG_DVC_SWRSR,
 	RSND_REG_DVC_DVUIR,
 	RSND_REG_DVC_ADINR,
@@ -220,6 +222,7 @@ struct dma_chan *rsnd_dma_request_channel(struct device_node *of_node,
  */
 enum rsnd_mod_type {
 	RSND_MOD_DVC = 0,
+	RSND_MOD_CTU,
 	RSND_MOD_SRC,
 	RSND_MOD_SSI,
 	RSND_MOD_MAX,
@@ -351,6 +354,7 @@ struct rsnd_dai_stream {
 #define rsnd_io_to_mod(io, i)	((i) < RSND_MOD_MAX ? (io)->mod[(i)] : NULL)
 #define rsnd_io_to_mod_ssi(io)	rsnd_io_to_mod((io), RSND_MOD_SSI)
 #define rsnd_io_to_mod_src(io)	rsnd_io_to_mod((io), RSND_MOD_SRC)
+#define rsnd_io_to_mod_ctu(io)	rsnd_io_to_mod((io), RSND_MOD_CTU)
 #define rsnd_io_to_mod_dvc(io)	rsnd_io_to_mod((io), RSND_MOD_DVC)
 #define rsnd_io_to_rdai(io)	((io)->rdai)
 #define rsnd_io_to_priv(io)	(rsnd_rdai_to_priv(rsnd_io_to_rdai(io)))
@@ -462,6 +466,12 @@ struct rsnd_priv {
 	void *src;
 	int src_nr;
 
+	/*
+	 * below value will be filled on rsnd_ctu_probe()
+	 */
+	void *ctu;
+	int ctu_nr;
+
 	/*
 	 * below value will be filled on rsnd_dvc_probe()
 	 */
@@ -567,6 +577,17 @@ int rsnd_src_ssiu_stop(struct rsnd_mod *ssi_mod,
 int rsnd_src_ssi_irq_enable(struct rsnd_mod *ssi_mod);
 int rsnd_src_ssi_irq_disable(struct rsnd_mod *ssi_mod);
 
+/*
+ *	R-Car CTU
+ */
+int rsnd_ctu_probe(struct platform_device *pdev,
+		   const struct rsnd_of_data *of_data,
+		   struct rsnd_priv *priv);
+
+void rsnd_ctu_remove(struct platform_device *pdev,
+		     struct rsnd_priv *priv);
+struct rsnd_mod *rsnd_ctu_mod_get(struct rsnd_priv *priv, int id);
+
 /*
  *	R-Car DVC
  */