ASoC: rsnd: add CTU support

This patch adds CTU (= Channel Transfer Unit) support on
Renesas R-Car sound driver.
It can Down/Up mixing and splitter. You need to check R-Car datasheet
especially CTUn_CPMDR/CTUn_SV0xR/CTUn_SV1xR/CTUn_SV2xR/CTUn_SV3xR
for setting parameter.

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

sound/soc/sh/rcar/ctu.c

@@ -12,8 +12,74 @@
 #define CTU_NAME_SIZE	16
 #define CTU_NAME "ctu"
 
+/*
+ * User needs to setup CTU by amixer, and its settings are
+ * based on below registers
+ *
+ * CTUn_CPMDR : amixser set "CTU Pass"
+ * CTUn_SV0xR : amixser set "CTU SV0"
+ * CTUn_SV1xR : amixser set "CTU SV1"
+ * CTUn_SV2xR : amixser set "CTU SV2"
+ * CTUn_SV3xR : amixser set "CTU SV3"
+ *
+ * [CTU Pass]
+ * 0000: default
+ * 0001: Connect input data of channel 0
+ * 0010: Connect input data of channel 1
+ * 0011: Connect input data of channel 2
+ * 0100: Connect input data of channel 3
+ * 0101: Connect input data of channel 4
+ * 0110: Connect input data of channel 5
+ * 0111: Connect input data of channel 6
+ * 1000: Connect input data of channel 7
+ * 1001: Connect calculated data by scale values of matrix row 0
+ * 1010: Connect calculated data by scale values of matrix row 1
+ * 1011: Connect calculated data by scale values of matrix row 2
+ * 1100: Connect calculated data by scale values of matrix row 3
+ *
+ * [CTU SVx]
+ * [Output0] = [SV00, SV01, SV02, SV03, SV04, SV05, SV06, SV07]
+ * [Output1] = [SV10, SV11, SV12, SV13, SV14, SV15, SV16, SV17]
+ * [Output2] = [SV20, SV21, SV22, SV23, SV24, SV25, SV26, SV27]
+ * [Output3] = [SV30, SV31, SV32, SV33, SV34, SV35, SV36, SV37]
+ * [Output4] = [ 0,   0,    0,    0,    0,    0,    0,    0   ]
+ * [Output5] = [ 0,   0,    0,    0,    0,    0,    0,    0   ]
+ * [Output6] = [ 0,   0,    0,    0,    0,    0,    0,    0   ]
+ * [Output7] = [ 0,   0,    0,    0,    0,    0,    0,    0   ]
+ *
+ * [SVxx]
+ * Plus					Minus
+ * value	time		dB	value		time		dB
+ * -----------------------------------------------------------------------
+ * H'7F_FFFF	2		6	H'80_0000	2		6
+ * ...
+ * H'40_0000	1		0	H'C0_0000	1		0
+ * ...
+ * H'00_0001	2.38 x 10^-7	-132
+ * H'00_0000	0		Mute	H'FF_FFFF	2.38 x 10^-7	-132
+ *
+ *
+ * Ex) Input ch -> Output ch
+ *	1ch     ->  0ch
+ *	0ch     ->  1ch
+ *
+ *	amixer set "CTU Reset" on
+ *	amixer set "CTU Pass" 9,10
+ *	amixer set "CTU SV0" 0,4194304
+ *	amixer set "CTU SV1" 4194304,0
+ * or
+ *	amixer set "CTU Reset" on
+ *	amixer set "CTU Pass" 2,1
+ */
+
 struct rsnd_ctu {
 	struct rsnd_mod mod;
+	struct rsnd_kctrl_cfg_m pass;
+	struct rsnd_kctrl_cfg_m sv0;
+	struct rsnd_kctrl_cfg_m sv1;
+	struct rsnd_kctrl_cfg_m sv2;
+	struct rsnd_kctrl_cfg_m sv3;
+	struct rsnd_kctrl_cfg_s reset;
 	int channels;
 };
 
@@ -58,51 +124,91 @@ static int rsnd_ctu_probe_(struct rsnd_mod *mod,
 static void rsnd_ctu_value_init(struct rsnd_dai_stream *io,
 			       struct rsnd_mod *mod)
 {
+	struct rsnd_ctu *ctu = rsnd_mod_to_ctu(mod);
+	u32 cpmdr = 0;
+	u32 scmdr = 0;
+	int i;
+
+	for (i = 0; i < RSND_MAX_CHANNELS; i++) {
+		u32 val = ctu->pass.val[i];
+
+		cpmdr |= val << (28 - (i * 4));
+
+		if ((val > 0x8) && (scmdr < (val - 0x8)))
+			scmdr = val - 0x8;
+	}
+
 	rsnd_mod_write(mod, CTU_CTUIR, 1);
 
 	rsnd_mod_write(mod, CTU_ADINR, rsnd_runtime_channel_original(io));
 
-	rsnd_mod_write(mod, CTU_CPMDR, 0);
-	rsnd_mod_write(mod, CTU_SCMDR, 0);
-	rsnd_mod_write(mod, CTU_SV00R, 0);
-	rsnd_mod_write(mod, CTU_SV01R, 0);
-	rsnd_mod_write(mod, CTU_SV02R, 0);
-	rsnd_mod_write(mod, CTU_SV03R, 0);
-	rsnd_mod_write(mod, CTU_SV04R, 0);
-	rsnd_mod_write(mod, CTU_SV05R, 0);
-	rsnd_mod_write(mod, CTU_SV06R, 0);
-	rsnd_mod_write(mod, CTU_SV07R, 0);
-
-	rsnd_mod_write(mod, CTU_SV10R, 0);
-	rsnd_mod_write(mod, CTU_SV11R, 0);
-	rsnd_mod_write(mod, CTU_SV12R, 0);
-	rsnd_mod_write(mod, CTU_SV13R, 0);
-	rsnd_mod_write(mod, CTU_SV14R, 0);
-	rsnd_mod_write(mod, CTU_SV15R, 0);
-	rsnd_mod_write(mod, CTU_SV16R, 0);
-	rsnd_mod_write(mod, CTU_SV17R, 0);
-
-	rsnd_mod_write(mod, CTU_SV20R, 0);
-	rsnd_mod_write(mod, CTU_SV21R, 0);
-	rsnd_mod_write(mod, CTU_SV22R, 0);
-	rsnd_mod_write(mod, CTU_SV23R, 0);
-	rsnd_mod_write(mod, CTU_SV24R, 0);
-	rsnd_mod_write(mod, CTU_SV25R, 0);
-	rsnd_mod_write(mod, CTU_SV26R, 0);
-	rsnd_mod_write(mod, CTU_SV27R, 0);
-
-	rsnd_mod_write(mod, CTU_SV30R, 0);
-	rsnd_mod_write(mod, CTU_SV31R, 0);
-	rsnd_mod_write(mod, CTU_SV32R, 0);
-	rsnd_mod_write(mod, CTU_SV33R, 0);
-	rsnd_mod_write(mod, CTU_SV34R, 0);
-	rsnd_mod_write(mod, CTU_SV35R, 0);
-	rsnd_mod_write(mod, CTU_SV36R, 0);
-	rsnd_mod_write(mod, CTU_SV37R, 0);
+	rsnd_mod_write(mod, CTU_CPMDR, cpmdr);
+
+	rsnd_mod_write(mod, CTU_SCMDR, scmdr);
+
+	if (scmdr > 0) {
+		rsnd_mod_write(mod, CTU_SV00R, ctu->sv0.val[0]);
+		rsnd_mod_write(mod, CTU_SV01R, ctu->sv0.val[1]);
+		rsnd_mod_write(mod, CTU_SV02R, ctu->sv0.val[2]);
+		rsnd_mod_write(mod, CTU_SV03R, ctu->sv0.val[3]);
+		rsnd_mod_write(mod, CTU_SV04R, ctu->sv0.val[4]);
+		rsnd_mod_write(mod, CTU_SV05R, ctu->sv0.val[5]);
+		rsnd_mod_write(mod, CTU_SV06R, ctu->sv0.val[6]);
+		rsnd_mod_write(mod, CTU_SV07R, ctu->sv0.val[7]);
+	}
+	if (scmdr > 1) {
+		rsnd_mod_write(mod, CTU_SV10R, ctu->sv1.val[0]);
+		rsnd_mod_write(mod, CTU_SV11R, ctu->sv1.val[1]);
+		rsnd_mod_write(mod, CTU_SV12R, ctu->sv1.val[2]);
+		rsnd_mod_write(mod, CTU_SV13R, ctu->sv1.val[3]);
+		rsnd_mod_write(mod, CTU_SV14R, ctu->sv1.val[4]);
+		rsnd_mod_write(mod, CTU_SV15R, ctu->sv1.val[5]);
+		rsnd_mod_write(mod, CTU_SV16R, ctu->sv1.val[6]);
+		rsnd_mod_write(mod, CTU_SV17R, ctu->sv1.val[7]);
+	}
+	if (scmdr > 2) {
+		rsnd_mod_write(mod, CTU_SV20R, ctu->sv2.val[0]);
+		rsnd_mod_write(mod, CTU_SV21R, ctu->sv2.val[1]);
+		rsnd_mod_write(mod, CTU_SV22R, ctu->sv2.val[2]);
+		rsnd_mod_write(mod, CTU_SV23R, ctu->sv2.val[3]);
+		rsnd_mod_write(mod, CTU_SV24R, ctu->sv2.val[4]);
+		rsnd_mod_write(mod, CTU_SV25R, ctu->sv2.val[5]);
+		rsnd_mod_write(mod, CTU_SV26R, ctu->sv2.val[6]);
+		rsnd_mod_write(mod, CTU_SV27R, ctu->sv2.val[7]);
+	}
+	if (scmdr > 3) {
+		rsnd_mod_write(mod, CTU_SV30R, ctu->sv3.val[0]);
+		rsnd_mod_write(mod, CTU_SV31R, ctu->sv3.val[1]);
+		rsnd_mod_write(mod, CTU_SV32R, ctu->sv3.val[2]);
+		rsnd_mod_write(mod, CTU_SV33R, ctu->sv3.val[3]);
+		rsnd_mod_write(mod, CTU_SV34R, ctu->sv3.val[4]);
+		rsnd_mod_write(mod, CTU_SV35R, ctu->sv3.val[5]);
+		rsnd_mod_write(mod, CTU_SV36R, ctu->sv3.val[6]);
+		rsnd_mod_write(mod, CTU_SV37R, ctu->sv3.val[7]);
+	}
 
 	rsnd_mod_write(mod, CTU_CTUIR, 0);
 }
 
+static void rsnd_ctu_value_reset(struct rsnd_dai_stream *io,
+				 struct rsnd_mod *mod)
+{
+	struct rsnd_ctu *ctu = rsnd_mod_to_ctu(mod);
+	int i;
+
+	if (!ctu->reset.val)
+		return;
+
+	for (i = 0; i < RSND_MAX_CHANNELS; i++) {
+		ctu->pass.val[i] = 0;
+		ctu->sv0.val[i] = 0;
+		ctu->sv1.val[i] = 0;
+		ctu->sv2.val[i] = 0;
+		ctu->sv3.val[i] = 0;
+	}
+	ctu->reset.val = 0;
+}
+
 static int rsnd_ctu_init(struct rsnd_mod *mod,
 			 struct rsnd_dai_stream *io,
 			 struct rsnd_priv *priv)
@@ -164,12 +270,66 @@ static int rsnd_ctu_hw_params(struct rsnd_mod *mod,
 	return 0;
 }
 
+static int rsnd_ctu_pcm_new(struct rsnd_mod *mod,
+			    struct rsnd_dai_stream *io,
+			    struct snd_soc_pcm_runtime *rtd)
+{
+	struct rsnd_ctu *ctu = rsnd_mod_to_ctu(mod);
+	int ret;
+
+	/* CTU Pass */
+	ret = rsnd_kctrl_new_m(mod, io, rtd, "CTU Pass",
+			       NULL,
+			       &ctu->pass, RSND_MAX_CHANNELS,
+			       0xC);
+
+	/* ROW0 */
+	ret = rsnd_kctrl_new_m(mod, io, rtd, "CTU SV0",
+			       NULL,
+			       &ctu->sv0, RSND_MAX_CHANNELS,
+			       0x00FFFFFF);
+	if (ret < 0)
+		return ret;
+
+	/* ROW1 */
+	ret = rsnd_kctrl_new_m(mod, io, rtd, "CTU SV1",
+			       NULL,
+			       &ctu->sv1, RSND_MAX_CHANNELS,
+			       0x00FFFFFF);
+	if (ret < 0)
+		return ret;
+
+	/* ROW2 */
+	ret = rsnd_kctrl_new_m(mod, io, rtd, "CTU SV2",
+			       NULL,
+			       &ctu->sv2, RSND_MAX_CHANNELS,
+			       0x00FFFFFF);
+	if (ret < 0)
+		return ret;
+
+	/* ROW3 */
+	ret = rsnd_kctrl_new_m(mod, io, rtd, "CTU SV3",
+			       NULL,
+			       &ctu->sv3, RSND_MAX_CHANNELS,
+			       0x00FFFFFF);
+	if (ret < 0)
+		return ret;
+
+	/* Reset */
+	ret = rsnd_kctrl_new_s(mod, io, rtd, "CTU Reset",
+			       rsnd_ctu_value_reset,
+			       &ctu->reset, 1);
+
+	return ret;
+}
+
 static struct rsnd_mod_ops rsnd_ctu_ops = {
 	.name		= CTU_NAME,
 	.probe		= rsnd_ctu_probe_,
 	.init		= rsnd_ctu_init,
 	.quit		= rsnd_ctu_quit,
 	.hw_params	= rsnd_ctu_hw_params,
+	.pcm_new	= rsnd_ctu_pcm_new,
 };
 
 struct rsnd_mod *rsnd_ctu_mod_get(struct rsnd_priv *priv, int id)