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 <[email protected]>
 *          Alexandre Mergnat <[email protected]>
 */

#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 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->symmetric_rate;
	int reg = get_chan_reg(dai->symmetric_channels);

	if (reg < 0)
		return -EINVAL;

	dmic_data->dmic_channel = dai->symmetric_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);
}