ASoC: mediatek: mt8365: Add DMIC DAI support

Add Digital Micro Device Audio Interface support for MT8365 SoC.
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Alexandre Mergnat <amergnat@baylibre.com>
Link: https://patch.msgid.link/20240226-audio-i350-v7-8-6518d953a141@baylibre.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/mediatek/mt8365/mt8365-dai-dmic.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * MediaTek 8365 ALSA SoC Audio DAI DMIC Control
+ *
+ * Copyright (c) 2024 MediaTek Inc.
+ * Authors: Jia Zeng <jia.zeng@mediatek.com>
+ *          Alexandre Mergnat <amergnat@baylibre.com>
+ */
+
+#include <linux/bitops.h>
+#include <linux/regmap.h>
+#include <sound/pcm_params.h>
+#include "mt8365-afe-clk.h"
+#include "mt8365-afe-common.h"
+
+struct mt8365_dmic_data {
+	bool two_wire_mode;
+	unsigned int clk_phase_sel_ch1;
+	unsigned int clk_phase_sel_ch2;
+	bool iir_on;
+	unsigned int irr_mode;
+	unsigned int dmic_mode;
+	unsigned int dmic_channel;
+};
+
+static int get_chan_reg(unsigned int channel)
+{
+	switch (channel) {
+	case 8:
+		fallthrough;
+	case 7:
+		return AFE_DMIC3_UL_SRC_CON0;
+	case 6:
+		fallthrough;
+	case 5:
+		return AFE_DMIC2_UL_SRC_CON0;
+	case 4:
+		fallthrough;
+	case 3:
+		return AFE_DMIC1_UL_SRC_CON0;
+	case 2:
+		fallthrough;
+	case 1:
+		return AFE_DMIC0_UL_SRC_CON0;
+	default:
+		return -EINVAL;
+	}
+}
+
+/* DAI Drivers */
+
+static void audio_dmic_adda_enable(struct mtk_base_afe *afe)
+{
+	mt8365_dai_enable_adda_on(afe);
+	regmap_update_bits(afe->regmap, AFE_ADDA_UL_DL_CON0,
+			   AFE_ADDA_UL_DL_DMIC_CLKDIV_ON,
+			   AFE_ADDA_UL_DL_DMIC_CLKDIV_ON);
+}
+
+static void audio_dmic_adda_disable(struct mtk_base_afe *afe)
+{
+	regmap_update_bits(afe->regmap, AFE_ADDA_UL_DL_CON0,
+			   AFE_ADDA_UL_DL_DMIC_CLKDIV_ON,
+			   ~AFE_ADDA_UL_DL_DMIC_CLKDIV_ON);
+	mt8365_dai_disable_adda_on(afe);
+}
+
+static void mt8365_dai_enable_dmic(struct mtk_base_afe *afe,
+				   struct snd_pcm_substream *substream,
+				   struct snd_soc_dai *dai)
+{
+	struct mt8365_afe_private *afe_priv = afe->platform_priv;
+	struct mt8365_dmic_data *dmic_data = afe_priv->dai_priv[MT8365_AFE_IO_DMIC];
+	unsigned int val_mask;
+	int reg = get_chan_reg(dmic_data->dmic_channel);
+
+	if (reg < 0)
+		return;
+
+	/* val and mask will be always same to enable */
+	val_mask = DMIC_TOP_CON_CH1_ON |
+		   DMIC_TOP_CON_CH2_ON |
+		   DMIC_TOP_CON_SRC_ON;
+
+	regmap_update_bits(afe->regmap, reg, val_mask, val_mask);
+}
+
+static void mt8365_dai_disable_dmic(struct mtk_base_afe *afe,
+				    struct snd_pcm_substream *substream,
+				    struct snd_soc_dai *dai)
+{
+	struct mt8365_afe_private *afe_priv = afe->platform_priv;
+	struct mt8365_dmic_data *dmic_data = afe_priv->dai_priv[MT8365_AFE_IO_DMIC];
+	unsigned int mask;
+	int reg = get_chan_reg(dmic_data->dmic_channel);
+
+	if (reg < 0)
+		return;
+
+	dev_dbg(afe->dev, "%s dmic_channel %d\n", __func__, dmic_data->dmic_channel);
+
+	mask = DMIC_TOP_CON_CH1_ON |
+	       DMIC_TOP_CON_CH2_ON |
+	       DMIC_TOP_CON_SRC_ON |
+	       DMIC_TOP_CON_SDM3_LEVEL_MODE;
+
+	/* Set all masked values to 0 */
+	regmap_update_bits(afe->regmap, reg, mask, 0);
+}
+
+static const struct reg_sequence mt8365_dmic_iir_coeff[] = {
+	{ AFE_DMIC0_IIR_COEF_02_01, 0x00000000 },
+	{ AFE_DMIC0_IIR_COEF_04_03, 0x00003FB8 },
+	{ AFE_DMIC0_IIR_COEF_06_05, 0x3FB80000 },
+	{ AFE_DMIC0_IIR_COEF_08_07, 0x3FB80000 },
+	{ AFE_DMIC0_IIR_COEF_10_09, 0x0000C048 },
+	{ AFE_DMIC1_IIR_COEF_02_01, 0x00000000 },
+	{ AFE_DMIC1_IIR_COEF_04_03, 0x00003FB8 },
+	{ AFE_DMIC1_IIR_COEF_06_05, 0x3FB80000 },
+	{ AFE_DMIC1_IIR_COEF_08_07, 0x3FB80000 },
+	{ AFE_DMIC1_IIR_COEF_10_09, 0x0000C048 },
+	{ AFE_DMIC2_IIR_COEF_02_01, 0x00000000 },
+	{ AFE_DMIC2_IIR_COEF_04_03, 0x00003FB8 },
+	{ AFE_DMIC2_IIR_COEF_06_05, 0x3FB80000 },
+	{ AFE_DMIC2_IIR_COEF_08_07, 0x3FB80000 },
+	{ AFE_DMIC2_IIR_COEF_10_09, 0x0000C048 },
+	{ AFE_DMIC3_IIR_COEF_02_01, 0x00000000 },
+	{ AFE_DMIC3_IIR_COEF_04_03, 0x00003FB8 },
+	{ AFE_DMIC3_IIR_COEF_06_05, 0x3FB80000 },
+	{ AFE_DMIC3_IIR_COEF_08_07, 0x3FB80000 },
+	{ AFE_DMIC3_IIR_COEF_10_09, 0x0000C048 },
+};
+
+static int mt8365_dai_load_dmic_iir_coeff_table(struct mtk_base_afe *afe)
+{
+	return regmap_multi_reg_write(afe->regmap,
+				      mt8365_dmic_iir_coeff,
+				      ARRAY_SIZE(mt8365_dmic_iir_coeff));
+}
+
+static int mt8365_dai_configure_dmic(struct mtk_base_afe *afe,
+				     struct snd_pcm_substream *substream,
+				     struct snd_soc_dai *dai)
+{
+	struct mt8365_afe_private *afe_priv = afe->platform_priv;
+	struct mt8365_dmic_data *dmic_data = afe_priv->dai_priv[MT8365_AFE_IO_DMIC];
+	bool two_wire_mode = dmic_data->two_wire_mode;
+	unsigned int clk_phase_sel_ch1 = dmic_data->clk_phase_sel_ch1;
+	unsigned int clk_phase_sel_ch2 = dmic_data->clk_phase_sel_ch2;
+	unsigned int val = 0;
+	unsigned int rate = dai->rate;
+	int reg = get_chan_reg(dai->channels);
+
+	if (reg < 0)
+		return -EINVAL;
+
+	dmic_data->dmic_channel = dai->channels;
+
+	val |= DMIC_TOP_CON_SDM3_LEVEL_MODE;
+
+	if (two_wire_mode) {
+		val |= DMIC_TOP_CON_TWO_WIRE_MODE;
+	} else {
+		val |= FIELD_PREP(DMIC_TOP_CON_CK_PHASE_SEL_CH1,
+				  clk_phase_sel_ch1);
+		val |= FIELD_PREP(DMIC_TOP_CON_CK_PHASE_SEL_CH2,
+				  clk_phase_sel_ch2);
+	}
+
+	switch (rate) {
+	case 48000:
+		val |= DMIC_TOP_CON_VOICE_MODE_48K;
+		break;
+	case 32000:
+		val |= DMIC_TOP_CON_VOICE_MODE_32K;
+		break;
+	case 16000:
+		val |= DMIC_TOP_CON_VOICE_MODE_16K;
+		break;
+	case 8000:
+		val |= DMIC_TOP_CON_VOICE_MODE_8K;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	regmap_update_bits(afe->regmap, reg, DMIC_TOP_CON_CONFIG_MASK, val);
+
+	return 0;
+}
+
+static int mt8365_dai_dmic_startup(struct snd_pcm_substream *substream,
+				   struct snd_soc_dai *dai)
+{
+	struct mtk_base_afe *afe = snd_soc_dai_get_drvdata(dai);
+
+	mt8365_afe_enable_main_clk(afe);
+
+	mt8365_afe_enable_top_cg(afe, MT8365_TOP_CG_DMIC0_ADC);
+	mt8365_afe_enable_top_cg(afe, MT8365_TOP_CG_DMIC1_ADC);
+	mt8365_afe_enable_top_cg(afe, MT8365_TOP_CG_DMIC2_ADC);
+	mt8365_afe_enable_top_cg(afe, MT8365_TOP_CG_DMIC3_ADC);
+
+	audio_dmic_adda_enable(afe);
+
+	return 0;
+}
+
+static void mt8365_dai_dmic_shutdown(struct snd_pcm_substream *substream,
+				     struct snd_soc_dai *dai)
+{
+	struct mtk_base_afe *afe = snd_soc_dai_get_drvdata(dai);
+
+	mt8365_dai_disable_dmic(afe, substream, dai);
+	audio_dmic_adda_disable(afe);
+	/* HW Request delay 125us before CG off */
+	usleep_range(125, 300);
+	mt8365_afe_disable_top_cg(afe, MT8365_TOP_CG_DMIC3_ADC);
+	mt8365_afe_disable_top_cg(afe, MT8365_TOP_CG_DMIC2_ADC);
+	mt8365_afe_disable_top_cg(afe, MT8365_TOP_CG_DMIC1_ADC);
+	mt8365_afe_disable_top_cg(afe, MT8365_TOP_CG_DMIC0_ADC);
+
+	mt8365_afe_disable_main_clk(afe);
+}
+
+static int mt8365_dai_dmic_prepare(struct snd_pcm_substream *substream,
+				   struct snd_soc_dai *dai)
+{
+	struct mtk_base_afe *afe = snd_soc_dai_get_drvdata(dai);
+
+	mt8365_dai_configure_dmic(afe, substream, dai);
+	mt8365_dai_enable_dmic(afe, substream, dai);
+
+	return 0;
+}
+
+static const struct snd_soc_dai_ops mt8365_afe_dmic_ops = {
+	.startup	= mt8365_dai_dmic_startup,
+	.shutdown	= mt8365_dai_dmic_shutdown,
+	.prepare	= mt8365_dai_dmic_prepare,
+};
+
+static struct snd_soc_dai_driver mtk_dai_dmic_driver[] = {
+	{
+		.name = "DMIC",
+		.id = MT8365_AFE_IO_DMIC,
+		.capture = {
+			.stream_name = "DMIC Capture",
+			.channels_min = 1,
+			.channels_max = 8,
+			.rates = SNDRV_PCM_RATE_16000 |
+				 SNDRV_PCM_RATE_32000 |
+				 SNDRV_PCM_RATE_48000,
+			.formats = SNDRV_PCM_FMTBIT_S16_LE |
+				   SNDRV_PCM_FMTBIT_S32_LE,
+		},
+		.ops = &mt8365_afe_dmic_ops,
+	}
+};
+
+/* DAI Controls */
+
+/* Values for 48kHz mode */
+static const char * const iir_mode_src[] = {
+	"SW custom", "5Hz", "10Hz", "25Hz", "50Hz", "65Hz"
+};
+
+static SOC_ENUM_SINGLE_DECL(iir_mode, AFE_DMIC0_UL_SRC_CON0, 7, iir_mode_src);
+
+static const struct snd_kcontrol_new mtk_dai_dmic_controls[] = {
+	SOC_SINGLE("DMIC IIR Switch", AFE_DMIC0_UL_SRC_CON0, DMIC_TOP_CON_IIR_ON, 1, 0),
+	SOC_ENUM("DMIC IIR Mode", iir_mode),
+};
+
+/* DAI widget */
+
+static const struct snd_soc_dapm_widget mtk_dai_dmic_widgets[] = {
+	SND_SOC_DAPM_INPUT("DMIC In"),
+};
+
+/* DAI route */
+
+static const struct snd_soc_dapm_route mtk_dai_dmic_routes[] = {
+	{"I14", NULL, "DMIC Capture"},
+	{"I15", NULL, "DMIC Capture"},
+	{"I16", NULL, "DMIC Capture"},
+	{"I17", NULL, "DMIC Capture"},
+	{"I18", NULL, "DMIC Capture"},
+	{"I19", NULL, "DMIC Capture"},
+	{"I20", NULL, "DMIC Capture"},
+	{"I21", NULL, "DMIC Capture"},
+	{"DMIC Capture", NULL, "DMIC In"},
+};
+
+static int init_dmic_priv_data(struct mtk_base_afe *afe)
+{
+	struct mt8365_afe_private *afe_priv = afe->platform_priv;
+	struct mt8365_dmic_data *dmic_priv;
+	struct device_node *np = afe->dev->of_node;
+	unsigned int temps[4];
+	int ret;
+
+	dmic_priv = devm_kzalloc(afe->dev, sizeof(*dmic_priv), GFP_KERNEL);
+	if (!dmic_priv)
+		return -ENOMEM;
+
+	ret = of_property_read_u32_array(np, "mediatek,dmic-mode",
+					 &temps[0],
+					 1);
+	if (ret == 0)
+		dmic_priv->two_wire_mode = !!temps[0];
+
+	if (!dmic_priv->two_wire_mode) {
+		dmic_priv->clk_phase_sel_ch1 = 0;
+		dmic_priv->clk_phase_sel_ch2 = 4;
+	}
+
+	afe_priv->dai_priv[MT8365_AFE_IO_DMIC] = dmic_priv;
+	return 0;
+}
+
+int mt8365_dai_dmic_register(struct mtk_base_afe *afe)
+{
+	struct mtk_base_afe_dai *dai;
+
+	dai = devm_kzalloc(afe->dev, sizeof(*dai), GFP_KERNEL);
+	if (!dai)
+		return -ENOMEM;
+
+	list_add(&dai->list, &afe->sub_dais);
+	dai->dai_drivers = mtk_dai_dmic_driver;
+	dai->num_dai_drivers = ARRAY_SIZE(mtk_dai_dmic_driver);
+	dai->controls = mtk_dai_dmic_controls;
+	dai->num_controls = ARRAY_SIZE(mtk_dai_dmic_controls);
+	dai->dapm_widgets = mtk_dai_dmic_widgets;
+	dai->num_dapm_widgets = ARRAY_SIZE(mtk_dai_dmic_widgets);
+	dai->dapm_routes = mtk_dai_dmic_routes;
+	dai->num_dapm_routes = ARRAY_SIZE(mtk_dai_dmic_routes);
+	return init_dmic_priv_data(afe);
+}