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Date:   Sat,  4 Jul 2020 13:38:47 +0200
From:   Clément Péron <peron.clem@...il.com>
To:     Maxime Ripard <mripard@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>
Cc:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        Marcus Cooper <codekipper@...il.com>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com,
        Clément Péron <peron.clem@...il.com>
Subject: [PATCH 01/16] ASoC: sun4i-i2s: Add support for H6 I2S

From: Jernej Skrabec <jernej.skrabec@...l.net>

H6 I2S is very similar to that in H3, except it supports up to 16
channels.

Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
Signed-off-by: Marcus Cooper <codekipper@...il.com>
Signed-off-by: Clément Péron <peron.clem@...il.com>
---
 sound/soc/sunxi/sun4i-i2s.c | 227 ++++++++++++++++++++++++++++++++++++
 1 file changed, 227 insertions(+)

diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
index d0a8d5810c0a..9690389cb68e 100644
--- a/sound/soc/sunxi/sun4i-i2s.c
+++ b/sound/soc/sunxi/sun4i-i2s.c
@@ -124,6 +124,21 @@
 #define SUN8I_I2S_RX_CHAN_SEL_REG	0x54
 #define SUN8I_I2S_RX_CHAN_MAP_REG	0x58
 
+/* Defines required for sun50i-h6 support */
+#define SUN50I_H6_I2S_TX_CHAN_SEL_OFFSET_MASK	GENMASK(21, 20)
+#define SUN50I_H6_I2S_TX_CHAN_SEL_OFFSET(offset)	((offset) << 20)
+#define SUN50I_H6_I2S_TX_CHAN_SEL_MASK		GENMASK(19, 16)
+#define SUN50I_H6_I2S_TX_CHAN_SEL(chan)		((chan - 1) << 16)
+#define SUN50I_H6_I2S_TX_CHAN_EN_MASK		GENMASK(15, 0)
+#define SUN50I_H6_I2S_TX_CHAN_EN(num_chan)	(((1 << num_chan) - 1))
+
+#define SUN50I_H6_I2S_TX_CHAN_MAP0_REG	0x44
+#define SUN50I_H6_I2S_TX_CHAN_MAP1_REG	0x48
+
+#define SUN50I_H6_I2S_RX_CHAN_SEL_REG	0x64
+#define SUN50I_H6_I2S_RX_CHAN_MAP0_REG	0x68
+#define SUN50I_H6_I2S_RX_CHAN_MAP1_REG	0x6C
+
 struct sun4i_i2s;
 
 /**
@@ -466,6 +481,65 @@ static int sun8i_i2s_set_chan_cfg(const struct sun4i_i2s *i2s,
 	return 0;
 }
 
+static int sun50i_i2s_set_chan_cfg(const struct sun4i_i2s *i2s,
+				   const struct snd_pcm_hw_params *params)
+{
+	unsigned int channels = params_channels(params);
+	unsigned int slots = channels;
+	unsigned int lrck_period;
+
+	if (i2s->slots)
+		slots = i2s->slots;
+
+	/* Map the channels for playback and capture */
+	regmap_write(i2s->regmap, SUN50I_H6_I2S_TX_CHAN_MAP1_REG, 0x76543210);
+	regmap_write(i2s->regmap, SUN50I_H6_I2S_RX_CHAN_MAP1_REG, 0x76543210);
+
+	/* Configure the channels */
+	regmap_update_bits(i2s->regmap, SUN8I_I2S_TX_CHAN_SEL_REG,
+			   SUN50I_H6_I2S_TX_CHAN_SEL_MASK,
+			   SUN50I_H6_I2S_TX_CHAN_SEL(channels));
+	regmap_update_bits(i2s->regmap, SUN50I_H6_I2S_RX_CHAN_SEL_REG,
+			   SUN50I_H6_I2S_TX_CHAN_SEL_MASK,
+			   SUN50I_H6_I2S_TX_CHAN_SEL(channels));
+
+	regmap_update_bits(i2s->regmap, SUN8I_I2S_CHAN_CFG_REG,
+			   SUN8I_I2S_CHAN_CFG_TX_SLOT_NUM_MASK,
+			   SUN8I_I2S_CHAN_CFG_TX_SLOT_NUM(channels));
+	regmap_update_bits(i2s->regmap, SUN8I_I2S_CHAN_CFG_REG,
+			   SUN8I_I2S_CHAN_CFG_RX_SLOT_NUM_MASK,
+			   SUN8I_I2S_CHAN_CFG_RX_SLOT_NUM(channels));
+
+	switch (i2s->format & SND_SOC_DAIFMT_FORMAT_MASK) {
+	case SND_SOC_DAIFMT_DSP_A:
+	case SND_SOC_DAIFMT_DSP_B:
+	case SND_SOC_DAIFMT_LEFT_J:
+	case SND_SOC_DAIFMT_RIGHT_J:
+		lrck_period = params_physical_width(params) * slots;
+		break;
+
+	case SND_SOC_DAIFMT_I2S:
+		lrck_period = params_physical_width(params);
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	if (i2s->slot_width)
+		lrck_period = i2s->slot_width;
+
+	regmap_update_bits(i2s->regmap, SUN4I_I2S_FMT0_REG,
+			   SUN8I_I2S_FMT0_LRCK_PERIOD_MASK,
+			   SUN8I_I2S_FMT0_LRCK_PERIOD(lrck_period));
+
+	regmap_update_bits(i2s->regmap, SUN8I_I2S_TX_CHAN_SEL_REG,
+			   SUN50I_H6_I2S_TX_CHAN_EN_MASK,
+			   SUN50I_H6_I2S_TX_CHAN_EN(channels));
+
+	return 0;
+}
+
 static int sun4i_i2s_hw_params(struct snd_pcm_substream *substream,
 			       struct snd_pcm_hw_params *params,
 			       struct snd_soc_dai *dai)
@@ -691,6 +765,108 @@ static int sun8i_i2s_set_soc_fmt(const struct sun4i_i2s *i2s,
 	return 0;
 }
 
+static int sun50i_i2s_set_soc_fmt(const struct sun4i_i2s *i2s,
+				  unsigned int fmt)
+{
+	u32 mode, val;
+	u8 offset;
+
+	/*
+	 * DAI clock polarity
+	 *
+	 * The setup for LRCK contradicts the datasheet, but under a
+	 * scope it's clear that the LRCK polarity is reversed
+	 * compared to the expected polarity on the bus.
+	 */
+	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+	case SND_SOC_DAIFMT_IB_IF:
+		/* Invert both clocks */
+		val = SUN8I_I2S_FMT0_BCLK_POLARITY_INVERTED;
+		break;
+	case SND_SOC_DAIFMT_IB_NF:
+		/* Invert bit clock */
+		val = SUN8I_I2S_FMT0_BCLK_POLARITY_INVERTED |
+		      SUN8I_I2S_FMT0_LRCLK_POLARITY_INVERTED;
+		break;
+	case SND_SOC_DAIFMT_NB_IF:
+		/* Invert frame clock */
+		val = 0;
+		break;
+	case SND_SOC_DAIFMT_NB_NF:
+		val = SUN8I_I2S_FMT0_LRCLK_POLARITY_INVERTED;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	regmap_update_bits(i2s->regmap, SUN4I_I2S_FMT0_REG,
+			   SUN8I_I2S_FMT0_LRCLK_POLARITY_MASK |
+			   SUN8I_I2S_FMT0_BCLK_POLARITY_MASK,
+			   val);
+
+	/* DAI Mode */
+	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+	case SND_SOC_DAIFMT_DSP_A:
+		mode = SUN8I_I2S_CTRL_MODE_PCM;
+		offset = 1;
+		break;
+
+	case SND_SOC_DAIFMT_DSP_B:
+		mode = SUN8I_I2S_CTRL_MODE_PCM;
+		offset = 0;
+		break;
+
+	case SND_SOC_DAIFMT_I2S:
+		mode = SUN8I_I2S_CTRL_MODE_LEFT;
+		offset = 1;
+		break;
+
+	case SND_SOC_DAIFMT_LEFT_J:
+		mode = SUN8I_I2S_CTRL_MODE_LEFT;
+		offset = 0;
+		break;
+
+	case SND_SOC_DAIFMT_RIGHT_J:
+		mode = SUN8I_I2S_CTRL_MODE_RIGHT;
+		offset = 0;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	regmap_update_bits(i2s->regmap, SUN4I_I2S_CTRL_REG,
+			   SUN8I_I2S_CTRL_MODE_MASK, mode);
+	regmap_update_bits(i2s->regmap, SUN8I_I2S_TX_CHAN_SEL_REG,
+			   SUN50I_H6_I2S_TX_CHAN_SEL_OFFSET_MASK,
+			   SUN50I_H6_I2S_TX_CHAN_SEL_OFFSET(offset));
+	regmap_update_bits(i2s->regmap, SUN50I_H6_I2S_RX_CHAN_SEL_REG,
+			   SUN50I_H6_I2S_TX_CHAN_SEL_OFFSET_MASK,
+			   SUN50I_H6_I2S_TX_CHAN_SEL_OFFSET(offset));
+
+	/* DAI clock master masks */
+	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+	case SND_SOC_DAIFMT_CBS_CFS:
+		/* BCLK and LRCLK master */
+		val = SUN8I_I2S_CTRL_BCLK_OUT |	SUN8I_I2S_CTRL_LRCK_OUT;
+		break;
+
+	case SND_SOC_DAIFMT_CBM_CFM:
+		/* BCLK and LRCLK slave */
+		val = 0;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	regmap_update_bits(i2s->regmap, SUN4I_I2S_CTRL_REG,
+			   SUN8I_I2S_CTRL_BCLK_OUT | SUN8I_I2S_CTRL_LRCK_OUT,
+			   val);
+
+	return 0;
+}
+
 static int sun4i_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 {
 	struct sun4i_i2s *i2s = snd_soc_dai_get_drvdata(dai);
@@ -971,6 +1147,22 @@ static const struct reg_default sun8i_i2s_reg_defaults[] = {
 	{ SUN8I_I2S_RX_CHAN_MAP_REG, 0x00000000 },
 };
 
+static const struct reg_default sun50i_i2s_reg_defaults[] = {
+	{ SUN4I_I2S_CTRL_REG, 0x00060000 },
+	{ SUN4I_I2S_FMT0_REG, 0x00000033 },
+	{ SUN4I_I2S_FMT1_REG, 0x00000030 },
+	{ SUN4I_I2S_FIFO_CTRL_REG, 0x000400f0 },
+	{ SUN4I_I2S_DMA_INT_CTRL_REG, 0x00000000 },
+	{ SUN4I_I2S_CLK_DIV_REG, 0x00000000 },
+	{ SUN8I_I2S_CHAN_CFG_REG, 0x00000000 },
+	{ SUN8I_I2S_TX_CHAN_SEL_REG, 0x00000000 },
+	{ SUN50I_H6_I2S_TX_CHAN_MAP0_REG, 0x00000000 },
+	{ SUN50I_H6_I2S_TX_CHAN_MAP1_REG, 0x00000000 },
+	{ SUN50I_H6_I2S_RX_CHAN_SEL_REG, 0x00000000 },
+	{ SUN50I_H6_I2S_RX_CHAN_MAP0_REG, 0x00000000 },
+	{ SUN50I_H6_I2S_RX_CHAN_MAP1_REG, 0x00000000 },
+};
+
 static const struct regmap_config sun4i_i2s_regmap_config = {
 	.reg_bits	= 32,
 	.reg_stride	= 4,
@@ -998,6 +1190,19 @@ static const struct regmap_config sun8i_i2s_regmap_config = {
 	.volatile_reg	= sun8i_i2s_volatile_reg,
 };
 
+static const struct regmap_config sun50i_i2s_regmap_config = {
+	.reg_bits	= 32,
+	.reg_stride	= 4,
+	.val_bits	= 32,
+	.max_register	= SUN50I_H6_I2S_RX_CHAN_MAP1_REG,
+	.cache_type	= REGCACHE_FLAT,
+	.reg_defaults	= sun50i_i2s_reg_defaults,
+	.num_reg_defaults	= ARRAY_SIZE(sun50i_i2s_reg_defaults),
+	.writeable_reg	= sun4i_i2s_wr_reg,
+	.readable_reg	= sun8i_i2s_rd_reg,
+	.volatile_reg	= sun8i_i2s_volatile_reg,
+};
+
 static int sun4i_i2s_runtime_resume(struct device *dev)
 {
 	struct sun4i_i2s *i2s = dev_get_drvdata(dev);
@@ -1156,6 +1361,24 @@ static const struct sun4i_i2s_quirks sun50i_a64_codec_i2s_quirks = {
 	.set_fmt		= sun4i_i2s_set_soc_fmt,
 };
 
+static const struct sun4i_i2s_quirks sun50i_h6_i2s_quirks = {
+	.has_reset		= true,
+	.reg_offset_txdata	= SUN8I_I2S_FIFO_TX_REG,
+	.sun4i_i2s_regmap	= &sun50i_i2s_regmap_config,
+	.field_clkdiv_mclk_en	= REG_FIELD(SUN4I_I2S_CLK_DIV_REG, 8, 8),
+	.field_fmt_wss		= REG_FIELD(SUN4I_I2S_FMT0_REG, 0, 2),
+	.field_fmt_sr		= REG_FIELD(SUN4I_I2S_FMT0_REG, 4, 6),
+	.bclk_dividers		= sun8i_i2s_clk_div,
+	.num_bclk_dividers	= ARRAY_SIZE(sun8i_i2s_clk_div),
+	.mclk_dividers		= sun8i_i2s_clk_div,
+	.num_mclk_dividers	= ARRAY_SIZE(sun8i_i2s_clk_div),
+	.get_bclk_parent_rate	= sun8i_i2s_get_bclk_parent_rate,
+	.get_sr			= sun8i_i2s_get_sr_wss,
+	.get_wss		= sun8i_i2s_get_sr_wss,
+	.set_chan_cfg		= sun50i_i2s_set_chan_cfg,
+	.set_fmt		= sun50i_i2s_set_soc_fmt,
+};
+
 static int sun4i_i2s_init_regmap_fields(struct device *dev,
 					struct sun4i_i2s *i2s)
 {
@@ -1325,6 +1548,10 @@ static const struct of_device_id sun4i_i2s_match[] = {
 		.compatible = "allwinner,sun50i-a64-codec-i2s",
 		.data = &sun50i_a64_codec_i2s_quirks,
 	},
+	{
+		.compatible = "allwinner,sun50i-h6-i2s",
+		.data = &sun50i_h6_i2s_quirks,
+	},
 	{}
 };
 MODULE_DEVICE_TABLE(of, sun4i_i2s_match);
-- 
2.25.1

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