ASoC: rsnd: add SSIU BUSIF support

Gen2 has BUSIF0-3, Gen3 has BUSIF0-7 on some SSIU.
Current driver is assuming it is using BUSIF0 as default.
Thus, SSI is attaching SSIU (with BUSIF0) by using rsnd_ssiu_attach().
But, TDM split mode also needs other BUSIF to use it.
This patch adds missing SSIU BUSIFx support.

BUSIF is handled by SSIU instead of SSI anymore.
Thus, its settings no longer needed on SSI node on DT.
This patch removes its settings from Document, but driver is still
keeping compatibility. Thus, old DT style is still working.
But, to avoid confusing, it doesn't indicate old compatibility things on
Document. New SoC should have SSIU on DT from this patch.

1) old style DT is still supported (= no rcar_sound,ssiu node on DT)
2) If ssiu is not indicated on playback/capture,
   BUSIF0 will be used as default
	playback = <&ssi3>; /* ssiu30 will be selected */
3) you can select own ssiu
	playback = <&ssi32 &ssi3>; /* ssiu32 will be selected */

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

sound/soc/sh/rcar/core.c

@@ -1144,6 +1144,7 @@ static void __rsnd_dai_probe(struct rsnd_priv *priv,
 			break;
 
 		rsnd_parse_connect_ssi(rdai, playback, capture);
+		rsnd_parse_connect_ssiu(rdai, playback, capture);
 		rsnd_parse_connect_src(rdai, playback, capture);
 		rsnd_parse_connect_ctu(rdai, playback, capture);
 		rsnd_parse_connect_mix(rdai, playback, capture);

sound/soc/sh/rcar/dma.c

@@ -218,7 +218,7 @@ struct dma_chan *rsnd_dma_request_channel(struct device_node *of_node,
 	int i = 0;
 
 	for_each_child_of_node(of_node, np) {
-		if (i == rsnd_mod_id(mod) && (!chan))
+		if (i == rsnd_mod_id_raw(mod) && (!chan))
 			chan = of_dma_request_slave_channel(np, name);
 		i++;
 	}
@@ -344,14 +344,16 @@ static u32 rsnd_dmapp_get_id(struct rsnd_dai_stream *io,
 			     struct rsnd_mod *mod)
 {
 	struct rsnd_mod *ssi = rsnd_io_to_mod_ssi(io);
+	struct rsnd_mod *ssiu = rsnd_io_to_mod_ssiu(io);
 	struct rsnd_mod *src = rsnd_io_to_mod_src(io);
 	struct rsnd_mod *dvc = rsnd_io_to_mod_dvc(io);
 	const u8 *entry = NULL;
 	int id = 255;
 	int size = 0;
 
-	if (mod == ssi) {
-		int busif = rsnd_ssi_get_busif(io);
+	if ((mod == ssi) ||
+	    (mod == ssiu)) {
+		int busif = rsnd_mod_id_sub(ssiu);
 
 		entry = gen2_id_table_ssiu;
 		size = ARRAY_SIZE(gen2_id_table_ssiu);
@@ -530,13 +532,14 @@ rsnd_gen2_dma_addr(struct rsnd_dai_stream *io,
 	struct device *dev = rsnd_priv_to_dev(priv);
 	phys_addr_t ssi_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SSI);
 	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 is_ssi = !!(rsnd_io_to_mod_ssi(io) == mod) ||
+		     !!(rsnd_io_to_mod_ssiu(io) == mod);
 	int use_src = !!rsnd_io_to_mod_src(io);
 	int use_cmd = !!rsnd_io_to_mod_dvc(io) ||
 		      !!rsnd_io_to_mod_mix(io) ||
 		      !!rsnd_io_to_mod_ctu(io);
 	int id = rsnd_mod_id(mod);
-	int busif = rsnd_ssi_get_busif(io);
+	int busif = rsnd_mod_id_sub(rsnd_io_to_mod_ssiu(io));
 	struct dma_addr {
 		dma_addr_t out_addr;
 		dma_addr_t in_addr;
@@ -620,7 +623,7 @@ static void rsnd_dma_of_path(struct rsnd_mod *this,
 			     struct rsnd_mod **mod_from,
 			     struct rsnd_mod **mod_to)
 {
-	struct rsnd_mod *ssi = rsnd_io_to_mod_ssi(io);
+	struct rsnd_mod *ssi;
 	struct rsnd_mod *src = rsnd_io_to_mod_src(io);
 	struct rsnd_mod *ctu = rsnd_io_to_mod_ctu(io);
 	struct rsnd_mod *mix = rsnd_io_to_mod_mix(io);
@@ -631,6 +634,28 @@ static void rsnd_dma_of_path(struct rsnd_mod *this,
 	struct device *dev = rsnd_priv_to_dev(priv);
 	int nr, i, idx;
 
+	/*
+	 * It should use "rcar_sound,ssiu" on DT.
+	 * But, we need to keep compatibility for old version.
+	 *
+	 * If it has "rcar_sound.ssiu", it will be used.
+	 * If not, "rcar_sound.ssi" will be used.
+	 * see
+	 *	rsnd_ssiu_dma_req()
+	 *	rsnd_ssi_dma_req()
+	 */
+	if (rsnd_ssiu_of_node(priv)) {
+		struct rsnd_mod *ssiu = rsnd_io_to_mod_ssiu(io);
+
+		/* use SSIU */
+		ssi = ssiu;
+		if (this == rsnd_io_to_mod_ssi(io))
+			this = ssiu;
+	} else {
+		/* keep compatible, use SSI */
+		ssi = rsnd_io_to_mod_ssi(io);
+	}
+
 	if (!ssi)
 		return;
 

sound/soc/sh/rcar/rsnd.h

@@ -441,6 +441,7 @@ int rsnd_runtime_is_tdm(struct rsnd_dai_stream *io);
 	of_get_child_by_name(rsnd_priv_to_dev(priv)->of_node, node)
 #define RSND_NODE_DAI	"rcar_sound,dai"
 #define RSND_NODE_SSI	"rcar_sound,ssi"
+#define RSND_NODE_SSIU	"rcar_sound,ssiu"
 #define RSND_NODE_SRC	"rcar_sound,src"
 #define RSND_NODE_CTU	"rcar_sound,ctu"
 #define RSND_NODE_MIX	"rcar_sound,mix"
@@ -725,7 +726,6 @@ void rsnd_ssi_remove(struct rsnd_priv *priv);
 struct rsnd_mod *rsnd_ssi_mod_get(struct rsnd_priv *priv, int id);
 int rsnd_ssi_is_dma_mode(struct rsnd_mod *mod);
 int rsnd_ssi_use_busif(struct rsnd_dai_stream *io);
-int rsnd_ssi_get_busif(struct rsnd_dai_stream *io);
 u32 rsnd_ssi_multi_slaves_runtime(struct rsnd_dai_stream *io);
 
 #define rsnd_ssi_is_pin_sharing(io)	\
@@ -746,6 +746,10 @@ int rsnd_ssiu_attach(struct rsnd_dai_stream *io,
 		     struct rsnd_mod *mod);
 int rsnd_ssiu_probe(struct rsnd_priv *priv);
 void rsnd_ssiu_remove(struct rsnd_priv *priv);
+void rsnd_parse_connect_ssiu(struct rsnd_dai *rdai,
+			     struct device_node *playback,
+			     struct device_node *capture);
+#define rsnd_ssiu_of_node(priv) rsnd_parse_of_node(priv, RSND_NODE_SSIU)
 
 /*
  *	R-Car SRC

sound/soc/sh/rcar/ssi.c

@@ -134,11 +134,6 @@ int rsnd_ssi_use_busif(struct rsnd_dai_stream *io)
 	return use_busif;
 }
 
-int rsnd_ssi_get_busif(struct rsnd_dai_stream *io)
-{
-	return 0; /* BUSIF0 only for now */
-}
-
 static void rsnd_ssi_status_clear(struct rsnd_mod *mod)
 {
 	rsnd_mod_write(mod, SSISR, 0);
@@ -745,7 +740,7 @@ static int rsnd_ssi_common_probe(struct rsnd_mod *mod,
 {
 	struct device *dev = rsnd_priv_to_dev(priv);
 	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
-	int ret;
+	int ret = 0;
 
 	/*
 	 * SSIP/SSIU/IRQ are not needed on
@@ -759,10 +754,6 @@ static int rsnd_ssi_common_probe(struct rsnd_mod *mod,
 	 * see rsnd_ssi_pcm_new()
 	 */
 
-	ret = rsnd_ssiu_attach(io, mod);
-	if (ret < 0)
-		return ret;
-
 	/*
 	 * SSI might be called again as PIO fallback
 	 * It is easy to manual handling for IRQ request/free
@@ -956,6 +947,17 @@ static struct dma_chan *rsnd_ssi_dma_req(struct rsnd_dai_stream *io,
 	int is_play = rsnd_io_is_play(io);
 	char *name;
 
+	/*
+	 * It should use "rcar_sound,ssiu" on DT.
+	 * But, we need to keep compatibility for old version.
+	 *
+	 * If it has "rcar_sound.ssiu", it will be used.
+	 * If not, "rcar_sound.ssi" will be used.
+	 * see
+	 *	rsnd_ssiu_dma_req()
+	 *	rsnd_dma_of_path()
+	 */
+
 	if (rsnd_ssi_use_busif(io))
 		name = is_play ? "rxu" : "txu";
 	else