ASoC: mediatek: mt8195: support pcm in platform driver

This patch adds mt8195 pcm dai driver.
Signed-off-by: Trevor Wu <trevor.wu@mediatek.com>
Link: https://lore.kernel.org/r/20210819084144.18483-6-trevor.wu@mediatek.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/mediatek/mt8195/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 <bicycle.tsai@mediatek.com>
+ *         Trevor Wu <trevor.wu@mediatek.com>
+ */
+
+#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_INPUT("PCM1_INPUT"),
+	SND_SOC_DAPM_OUTPUT("PCM1_OUTPUT"),
+};
+
+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_OUTPUT", NULL, "PCM1 Playback"},
+	{"PCM1 Capture", NULL, "PCM1_INPUT"},
+};
+
+static void mtk_dai_pcm_enable(struct mtk_base_afe *afe)
+{
+	regmap_update_bits(afe->regmap, PCM_INTF_CON1,
+			   PCM_INTF_CON1_PCM_EN, PCM_INTF_CON1_PCM_EN);
+}
+
+static void mtk_dai_pcm_disable(struct mtk_base_afe *afe)
+{
+	regmap_update_bits(afe->regmap, PCM_INTF_CON1,
+			   PCM_INTF_CON1_PCM_EN, 0x0);
+}
+
+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 = afe_priv->dai_priv[dai->id];
+	unsigned int slave_mode = pcmif_priv->slave_mode;
+	unsigned int lrck_inv = pcmif_priv->lrck_inv;
+	unsigned int bck_inv = pcmif_priv->bck_inv;
+	unsigned int fmt = pcmif_priv->format;
+	unsigned int bit_width = dai->sample_bits;
+	unsigned int val = 0;
+	unsigned int mask = 0;
+	int fs = 0;
+	int mode = 0;
+
+	/* 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_startup(struct snd_pcm_substream *substream,
+			       struct snd_soc_dai *dai)
+{
+	struct mtk_base_afe *afe = snd_soc_dai_get_drvdata(dai);
+	struct mt8195_afe_private *afe_priv = afe->platform_priv;
+
+	if (dai->component->active)
+		return 0;
+
+	mt8195_afe_enable_clk(afe, afe_priv->clk[MT8195_CLK_AUD_ASRC11]);
+	mt8195_afe_enable_clk(afe, afe_priv->clk[MT8195_CLK_AUD_ASRC12]);
+	mt8195_afe_enable_clk(afe, afe_priv->clk[MT8195_CLK_AUD_PCMIF]);
+
+	return 0;
+}
+
+static void mtk_dai_pcm_shutdown(struct snd_pcm_substream *substream,
+				 struct snd_soc_dai *dai)
+{
+	struct mtk_base_afe *afe = snd_soc_dai_get_drvdata(dai);
+	struct mt8195_afe_private *afe_priv = afe->platform_priv;
+
+	if (dai->component->active)
+		return;
+
+	mtk_dai_pcm_disable(afe);
+
+	mt8195_afe_disable_clk(afe, afe_priv->clk[MT8195_CLK_AUD_PCMIF]);
+	mt8195_afe_disable_clk(afe, afe_priv->clk[MT8195_CLK_AUD_ASRC12]);
+	mt8195_afe_disable_clk(afe, afe_priv->clk[MT8195_CLK_AUD_ASRC11]);
+}
+
+static int mtk_dai_pcm_prepare(struct snd_pcm_substream *substream,
+			       struct snd_soc_dai *dai)
+{
+	struct mtk_base_afe *afe = snd_soc_dai_get_drvdata(dai);
+	int ret = 0;
+
+	if (snd_soc_dai_stream_active(dai, SNDRV_PCM_STREAM_PLAYBACK) &&
+	    snd_soc_dai_stream_active(dai, SNDRV_PCM_STREAM_CAPTURE))
+		return 0;
+
+	ret = mtk_dai_pcm_configure(substream, dai);
+	if (ret)
+		return ret;
+
+	mtk_dai_pcm_enable(afe);
+
+	return 0;
+}
+
+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 = afe_priv->dai_priv[dai->id];
+
+	dev_dbg(dai->dev, "%s fmt 0x%x\n", __func__, fmt);
+
+	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_MASTER_MASK) {
+	case SND_SOC_DAIFMT_CBM_CFM:
+		pcmif_priv->slave_mode = 1;
+		break;
+	case SND_SOC_DAIFMT_CBS_CFS:
+		pcmif_priv->slave_mode = 0;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static const struct snd_soc_dai_ops mtk_dai_pcm_ops = {
+	.startup	= mtk_dai_pcm_startup,
+	.shutdown	= mtk_dai_pcm_shutdown,
+	.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);
+}