mt8195-dai-pcm.c

// SPDX-License-Identifier: GPL-2.0
/*
 * MediaTek ALSA SoC Audio DAI PCM I/F Control
 *
 * Copyright (c) 2020 MediaTek Inc.
 * Author: Bicycle Tsai <[email protected]>
 *         Trevor Wu <[email protected]>
 */

#include <linux/regmap.h>
#include <sound/pcm_params.h>
#include "mt8195-afe-clk.h"
#include "mt8195-afe-common.h"
#include "mt8195-reg.h"

enum {
	MTK_DAI_PCM_FMT_I2S,
	MTK_DAI_PCM_FMT_EIAJ,
	MTK_DAI_PCM_FMT_MODEA,
	MTK_DAI_PCM_FMT_MODEB,
};

enum {
	MTK_DAI_PCM_CLK_A1SYS,
	MTK_DAI_PCM_CLK_A2SYS,
	MTK_DAI_PCM_CLK_26M_48K,
	MTK_DAI_PCM_CLK_26M_441K,
};

struct mtk_dai_pcm_rate {
	unsigned int rate;
	unsigned int reg_value;
};

struct mtk_dai_pcmif_priv {
	unsigned int slave_mode;
	unsigned int lrck_inv;
	unsigned int bck_inv;
	unsigned int format;
};

static const struct mtk_dai_pcm_rate mtk_dai_pcm_rates[] = {
	{ .rate = 8000, .reg_value = 0, },
	{ .rate = 16000, .reg_value = 1, },
	{ .rate = 32000, .reg_value = 2, },
	{ .rate = 48000, .reg_value = 3, },
	{ .rate = 11025, .reg_value = 1, },
	{ .rate = 22050, .reg_value = 2, },
	{ .rate = 44100, .reg_value = 3, },
};

static int mtk_dai_pcm_mode(unsigned int rate)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(mtk_dai_pcm_rates); i++)
		if (mtk_dai_pcm_rates[i].rate == rate)
			return mtk_dai_pcm_rates[i].reg_value;

	return -EINVAL;
}

static const struct snd_kcontrol_new mtk_dai_pcm_o000_mix[] = {
	SOC_DAPM_SINGLE_AUTODISABLE("I000 Switch", AFE_CONN0, 0, 1, 0),
	SOC_DAPM_SINGLE_AUTODISABLE("I070 Switch", AFE_CONN0_2, 6, 1, 0),
};

static const struct snd_kcontrol_new mtk_dai_pcm_o001_mix[] = {
	SOC_DAPM_SINGLE_AUTODISABLE("I001 Switch", AFE_CONN1, 1, 1, 0),
	SOC_DAPM_SINGLE_AUTODISABLE("I071 Switch", AFE_CONN1_2, 7, 1, 0),
};

static const struct snd_soc_dapm_widget mtk_dai_pcm_widgets[] = {
	SND_SOC_DAPM_MIXER("I002", SND_SOC_NOPM, 0, 0, NULL, 0),
	SND_SOC_DAPM_MIXER("I003", SND_SOC_NOPM, 0, 0, NULL, 0),
	SND_SOC_DAPM_MIXER("O000", SND_SOC_NOPM, 0, 0,
			   mtk_dai_pcm_o000_mix,
			   ARRAY_SIZE(mtk_dai_pcm_o000_mix)),
	SND_SOC_DAPM_MIXER("O001", SND_SOC_NOPM, 0, 0,
			   mtk_dai_pcm_o001_mix,
			   ARRAY_SIZE(mtk_dai_pcm_o001_mix)),

	SND_SOC_DAPM_SUPPLY("PCM_EN", PCM_INTF_CON1,
			    PCM_INTF_CON1_PCM_EN_SHIFT, 0, NULL, 0),

	SND_SOC_DAPM_INPUT("PCM1_INPUT"),
	SND_SOC_DAPM_OUTPUT("PCM1_OUTPUT"),

	SND_SOC_DAPM_CLOCK_SUPPLY("aud_asrc11"),
	SND_SOC_DAPM_CLOCK_SUPPLY("aud_asrc12"),
	SND_SOC_DAPM_CLOCK_SUPPLY("aud_pcmif"),
};

static const struct snd_soc_dapm_route mtk_dai_pcm_routes[] = {
	{"I002", NULL, "PCM1 Capture"},
	{"I003", NULL, "PCM1 Capture"},

	{"O000", "I000 Switch", "I000"},
	{"O001", "I001 Switch", "I001"},

	{"O000", "I070 Switch", "I070"},
	{"O001", "I071 Switch", "I071"},

	{"PCM1 Playback", NULL, "O000"},
	{"PCM1 Playback", NULL, "O001"},

	{"PCM1 Playback", NULL, "PCM_EN"},
	{"PCM1 Playback", NULL, "aud_asrc12"},
	{"PCM1 Playback", NULL, "aud_pcmif"},

	{"PCM1 Capture", NULL, "PCM_EN"},
	{"PCM1 Capture", NULL, "aud_asrc11"},
	{"PCM1 Capture", NULL, "aud_pcmif"},

	{"PCM1_OUTPUT", NULL, "PCM1 Playback"},
	{"PCM1 Capture", NULL, "PCM1_INPUT"},
};

static int mtk_dai_pcm_configure(struct snd_pcm_substream *substream,
				 struct snd_soc_dai *dai)
{
	struct snd_pcm_runtime * const runtime = substream->runtime;
	struct mtk_base_afe *afe = snd_soc_dai_get_drvdata(dai);
	struct mt8195_afe_private *afe_priv = afe->platform_priv;
	struct mtk_dai_pcmif_priv *pcmif_priv;
	unsigned int slave_mode;
	unsigned int lrck_inv;
	unsigned int bck_inv;
	unsigned int fmt;
	unsigned int bit_width = dai->symmetric_sample_bits;
	unsigned int val = 0;
	unsigned int mask = 0;
	int fs = 0;
	int mode = 0;

	if (dai->id != MT8195_AFE_IO_PCM)
		return -EINVAL;

	pcmif_priv = afe_priv->dai_priv[dai->id];
	slave_mode = pcmif_priv->slave_mode;
	lrck_inv = pcmif_priv->lrck_inv;
	bck_inv = pcmif_priv->bck_inv;
	fmt = pcmif_priv->format;

	/* sync freq mode */
	fs = mt8195_afe_fs_timing(runtime->rate);
	if (fs < 0)
		return -EINVAL;
	val |= PCM_INTF_CON2_SYNC_FREQ_MODE(fs);
	mask |= PCM_INTF_CON2_SYNC_FREQ_MODE_MASK;

	/* clk domain sel */
	if (runtime->rate % 8000)
		val |= PCM_INTF_CON2_CLK_DOMAIN_SEL(MTK_DAI_PCM_CLK_26M_441K);
	else
		val |= PCM_INTF_CON2_CLK_DOMAIN_SEL(MTK_DAI_PCM_CLK_26M_48K);
	mask |= PCM_INTF_CON2_CLK_DOMAIN_SEL_MASK;

	regmap_update_bits(afe->regmap, PCM_INTF_CON2, mask, val);

	val = 0;
	mask = 0;

	/* pcm mode */
	mode = mtk_dai_pcm_mode(runtime->rate);
	if (mode < 0)
		return -EINVAL;
	val |= PCM_INTF_CON1_PCM_MODE(mode);
	mask |= PCM_INTF_CON1_PCM_MODE_MASK;

	/* pcm format */
	val |= PCM_INTF_CON1_PCM_FMT(fmt);
	mask |= PCM_INTF_CON1_PCM_FMT_MASK;

	/* pcm sync length */
	if (fmt == MTK_DAI_PCM_FMT_MODEA ||
	    fmt == MTK_DAI_PCM_FMT_MODEB)
		val |= PCM_INTF_CON1_SYNC_LENGTH(1);
	else
		val |= PCM_INTF_CON1_SYNC_LENGTH(bit_width);
	mask |= PCM_INTF_CON1_SYNC_LENGTH_MASK;

	/* pcm bits, word length */
	if (bit_width > 16) {
		val |= PCM_INTF_CON1_PCM_24BIT;
		val |= PCM_INTF_CON1_PCM_WLEN_64BCK;
	} else {
		val |= PCM_INTF_CON1_PCM_16BIT;
		val |= PCM_INTF_CON1_PCM_WLEN_32BCK;
	}
	mask |= PCM_INTF_CON1_PCM_BIT_MASK;
	mask |= PCM_INTF_CON1_PCM_WLEN_MASK;

	/* master/slave */
	if (!slave_mode) {
		val |= PCM_INTF_CON1_PCM_MASTER;

		if (lrck_inv)
			val |= PCM_INTF_CON1_SYNC_OUT_INV;
		if (bck_inv)
			val |= PCM_INTF_CON1_BCLK_OUT_INV;
		mask |= PCM_INTF_CON1_CLK_OUT_INV_MASK;
	} else {
		val |= PCM_INTF_CON1_PCM_SLAVE;

		if (lrck_inv)
			val |= PCM_INTF_CON1_SYNC_IN_INV;
		if (bck_inv)
			val |= PCM_INTF_CON1_BCLK_IN_INV;
		mask |= PCM_INTF_CON1_CLK_IN_INV_MASK;

		/* TODO: add asrc setting for slave mode */
	}
	mask |= PCM_INTF_CON1_PCM_M_S_MASK;

	regmap_update_bits(afe->regmap, PCM_INTF_CON1, mask, val);

	return 0;
}

/* dai ops */
static int mtk_dai_pcm_prepare(struct snd_pcm_substream *substream,
			       struct snd_soc_dai *dai)
{
	struct snd_soc_dapm_widget *p = snd_soc_dai_get_widget_playback(dai);
	struct snd_soc_dapm_widget *c = snd_soc_dai_get_widget_capture(dai);

	dev_dbg(dai->dev, "%s(), id %d, stream %d, widget active p %d, c %d\n",
		__func__, dai->id, substream->stream,
		p->active, c->active);

	if (p->active || c->active)
		return 0;

	return mtk_dai_pcm_configure(substream, dai);
}

static int mtk_dai_pcm_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
	struct mtk_base_afe *afe = snd_soc_dai_get_drvdata(dai);
	struct mt8195_afe_private *afe_priv = afe->platform_priv;
	struct mtk_dai_pcmif_priv *pcmif_priv;

	dev_dbg(dai->dev, "%s fmt 0x%x\n", __func__, fmt);

	if (dai->id != MT8195_AFE_IO_PCM)
		return -EINVAL;

	pcmif_priv = afe_priv->dai_priv[dai->id];

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
		pcmif_priv->format = MTK_DAI_PCM_FMT_I2S;
		break;
	case SND_SOC_DAIFMT_DSP_A:
		pcmif_priv->format = MTK_DAI_PCM_FMT_MODEA;
		break;
	case SND_SOC_DAIFMT_DSP_B:
		pcmif_priv->format = MTK_DAI_PCM_FMT_MODEB;
		break;
	default:
		return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
		pcmif_priv->bck_inv = 0;
		pcmif_priv->lrck_inv = 0;
		break;
	case SND_SOC_DAIFMT_NB_IF:
		pcmif_priv->bck_inv = 0;
		pcmif_priv->lrck_inv = 1;
		break;
	case SND_SOC_DAIFMT_IB_NF:
		pcmif_priv->bck_inv = 1;
		pcmif_priv->lrck_inv = 0;
		break;
	case SND_SOC_DAIFMT_IB_IF:
		pcmif_priv->bck_inv = 1;
		pcmif_priv->lrck_inv = 1;
		break;
	default:
		return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
	case SND_SOC_DAIFMT_BC_FC:
		pcmif_priv->slave_mode = 1;
		break;
	case SND_SOC_DAIFMT_BP_FP:
		pcmif_priv->slave_mode = 0;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static const struct snd_soc_dai_ops mtk_dai_pcm_ops = {
	.prepare	= mtk_dai_pcm_prepare,
	.set_fmt	= mtk_dai_pcm_set_fmt,
};

/* dai driver */
#define MTK_PCM_RATES (SNDRV_PCM_RATE_8000_48000)

#define MTK_PCM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE |\
			 SNDRV_PCM_FMTBIT_S24_LE |\
			 SNDRV_PCM_FMTBIT_S32_LE)

static struct snd_soc_dai_driver mtk_dai_pcm_driver[] = {
	{
		.name = "PCM1",
		.id = MT8195_AFE_IO_PCM,
		.playback = {
			.stream_name = "PCM1 Playback",
			.channels_min = 1,
			.channels_max = 2,
			.rates = MTK_PCM_RATES,
			.formats = MTK_PCM_FORMATS,
		},
		.capture = {
			.stream_name = "PCM1 Capture",
			.channels_min = 1,
			.channels_max = 2,
			.rates = MTK_PCM_RATES,
			.formats = MTK_PCM_FORMATS,
		},
		.ops = &mtk_dai_pcm_ops,
		.symmetric_rate = 1,
		.symmetric_sample_bits = 1,
	},
};

static int init_pcmif_priv_data(struct mtk_base_afe *afe)
{
	struct mt8195_afe_private *afe_priv = afe->platform_priv;
	struct mtk_dai_pcmif_priv *pcmif_priv;

	pcmif_priv = devm_kzalloc(afe->dev, sizeof(struct mtk_dai_pcmif_priv),
				  GFP_KERNEL);
	if (!pcmif_priv)
		return -ENOMEM;

	afe_priv->dai_priv[MT8195_AFE_IO_PCM] = pcmif_priv;
	return 0;
}

int mt8195_dai_pcm_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_pcm_driver;
	dai->num_dai_drivers = ARRAY_SIZE(mtk_dai_pcm_driver);

	dai->dapm_widgets = mtk_dai_pcm_widgets;
	dai->num_dapm_widgets = ARRAY_SIZE(mtk_dai_pcm_widgets);
	dai->dapm_routes = mtk_dai_pcm_routes;
	dai->num_dapm_routes = ARRAY_SIZE(mtk_dai_pcm_routes);

	return init_pcmif_priv_data(afe);
}