ASoC: rsnd: add MIX (Mixer) support

This patch adds MIX (Mixer) initial support for rsnd driver.
It is assuming that this MIX is used via DPCM.

This is sample code for playback.

	CPU0  : [MEM] -> [SRC1] -> [CTU02] -+
					    |
					    +-> [MIX0] -> [DVC0] -> [SSI0]
	                                    |
	CPU1  : [MEM] -> [SRC2] -> [CTU03] -+

	sound {
		compatible = "renesas,rsrc-card";

		...

		cpu@0 {
			sound-dai = <&rcar_sound 0>;
		};

		cpu@1 {
			sound-dai = <&rcar_sound 1>;
		};

		codec {
			...
		};
	};

	rcar_sound {

		...

		rcar_sound,dai {
			dai0 {
				playback = <&src1 &ctu02 &mix0 &dvc0 &ssi0>;
			};
			dai1 {
				playback = <&src2 &ctu03 &mix0 &dvc0 &ssi0>;
			};
		};
	};

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>

1 files changed, 200 insertions, 0 deletions

diff --git a/sound/soc/sh/rcar/mix.c b/sound/soc/sh/rcar/mix.c
new file mode 100644
index 000000000000..0d5c102db6f5
--- /dev/null
+++ b/sound/soc/sh/rcar/mix.c
@@ -0,0 +1,200 @@
+/*
+ * mix.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 MIX_NAME_SIZE	16
+#define MIX_NAME "mix"
+
+struct rsnd_mix {
+	struct rsnd_mix_platform_info *info; /* rcar_snd.h */
+	struct rsnd_mod mod;
+};
+
+#define rsnd_mix_nr(priv) ((priv)->mix_nr)
+#define for_each_rsnd_mix(pos, priv, i)					\
+	for ((i) = 0;							\
+	     ((i) < rsnd_mix_nr(priv)) &&				\
+		     ((pos) = (struct rsnd_mix *)(priv)->mix + i);	\
+	     i++)
+
+
+static void rsnd_mix_soft_reset(struct rsnd_mod *mod)
+{
+	rsnd_mod_write(mod, MIX_SWRSR, 0);
+	rsnd_mod_write(mod, MIX_SWRSR, 1);
+}
+
+#define rsnd_mix_initialize_lock(mod)	__rsnd_mix_initialize_lock(mod, 1)
+#define rsnd_mix_initialize_unlock(mod)	__rsnd_mix_initialize_lock(mod, 0)
+static void __rsnd_mix_initialize_lock(struct rsnd_mod *mod, u32 enable)
+{
+	rsnd_mod_write(mod, MIX_MIXIR, enable);
+}
+
+static void rsnd_mix_volume_update(struct rsnd_dai_stream *io,
+				  struct rsnd_mod *mod)
+{
+
+	/* Disable MIX dB setting */
+	rsnd_mod_write(mod, MIX_MDBER, 0);
+
+	rsnd_mod_write(mod, MIX_MDBAR, 0);
+	rsnd_mod_write(mod, MIX_MDBBR, 0);
+	rsnd_mod_write(mod, MIX_MDBCR, 0);
+	rsnd_mod_write(mod, MIX_MDBDR, 0);
+
+	/* Enable MIX dB setting */
+	rsnd_mod_write(mod, MIX_MDBER, 1);
+}
+
+static int rsnd_mix_init(struct rsnd_mod *mod,
+			 struct rsnd_dai_stream *io,
+			 struct rsnd_priv *priv)
+{
+	rsnd_mod_hw_start(mod);
+
+	rsnd_mix_soft_reset(mod);
+
+	rsnd_mix_initialize_lock(mod);
+
+	rsnd_mod_write(mod, MIX_ADINR, rsnd_get_adinr_chan(mod, io));
+
+	rsnd_path_parse(priv, io);
+
+	/* volume step */
+	rsnd_mod_write(mod, MIX_MIXMR, 0);
+	rsnd_mod_write(mod, MIX_MVPDR, 0);
+
+	rsnd_mix_volume_update(io, mod);
+
+	rsnd_mix_initialize_unlock(mod);
+
+	return 0;
+}
+
+static int rsnd_mix_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_mix_ops = {
+	.name		= MIX_NAME,
+	.init		= rsnd_mix_init,
+	.quit		= rsnd_mix_quit,
+};
+
+struct rsnd_mod *rsnd_mix_mod_get(struct rsnd_priv *priv, int id)
+{
+	if (WARN_ON(id < 0 || id >= rsnd_mix_nr(priv)))
+		id = 0;
+
+	return &((struct rsnd_mix *)(priv->mix) + id)->mod;
+}
+
+static void rsnd_of_parse_mix(struct platform_device *pdev,
+			      const struct rsnd_of_data *of_data,
+			      struct rsnd_priv *priv)
+{
+	struct device_node *node;
+	struct rsnd_mix_platform_info *mix_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,mix");
+	if (!node)
+		return;
+
+	nr = of_get_child_count(node);
+	if (!nr)
+		goto rsnd_of_parse_mix_end;
+
+	mix_info = devm_kzalloc(dev,
+				sizeof(struct rsnd_mix_platform_info) * nr,
+				GFP_KERNEL);
+	if (!mix_info) {
+		dev_err(dev, "mix info allocation error\n");
+		goto rsnd_of_parse_mix_end;
+	}
+
+	info->mix_info		= mix_info;
+	info->mix_info_nr	= nr;
+
+rsnd_of_parse_mix_end:
+	of_node_put(node);
+
+}
+
+int rsnd_mix_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_mix *mix;
+	struct clk *clk;
+	char name[MIX_NAME_SIZE];
+	int i, nr, ret;
+
+	/* This driver doesn't support Gen1 at this point */
+	if (rsnd_is_gen1(priv)) {
+		dev_warn(dev, "MIX is not supported on Gen1\n");
+		return -EINVAL;
+	}
+
+	rsnd_of_parse_mix(pdev, of_data, priv);
+
+	nr = info->mix_info_nr;
+	if (!nr)
+		return 0;
+
+	mix	= devm_kzalloc(dev, sizeof(*mix) * nr, GFP_KERNEL);
+	if (!mix)
+		return -ENOMEM;
+
+	priv->mix_nr	= nr;
+	priv->mix	= mix;
+
+	for_each_rsnd_mix(mix, priv, i) {
+		snprintf(name, MIX_NAME_SIZE, "%s.%d",
+			 MIX_NAME, i);
+
+		clk = devm_clk_get(dev, name);
+		if (IS_ERR(clk))
+			return PTR_ERR(clk);
+
+		mix->info = &info->mix_info[i];
+
+		ret = rsnd_mod_init(priv, &mix->mod, &rsnd_mix_ops,
+				    clk, RSND_MOD_MIX, i);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+void rsnd_mix_remove(struct platform_device *pdev,
+		     struct rsnd_priv *priv)
+{
+	struct rsnd_mix *mix;
+	int i;
+
+	for_each_rsnd_mix(mix, priv, i) {
+		rsnd_mod_quit(&mix->mod);
+	}
+}