axg-tdmout.c

// SPDX-License-Identifier: (GPL-2.0 OR MIT)
//
// Copyright (c) 2018 BayLibre, SAS.
// Author: Jerome Brunet <jbrunet@baylibre.com>

#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/regmap.h>
#include <sound/soc.h>
#include <sound/soc-dai.h>

#include "axg-tdm-formatter.h"

#define TDMOUT_CTRL0			0x00
#define  TDMOUT_CTRL0_BITNUM_MASK	GENMASK(4, 0)
#define  TDMOUT_CTRL0_BITNUM(x)		((x) << 0)
#define  TDMOUT_CTRL0_SLOTNUM_MASK	GENMASK(9, 5)
#define  TDMOUT_CTRL0_SLOTNUM(x)	((x) << 5)
#define  TDMOUT_CTRL0_INIT_BITNUM_MASK	GENMASK(19, 15)
#define  TDMOUT_CTRL0_INIT_BITNUM(x)	((x) << 15)
#define  TDMOUT_CTRL0_ENABLE		BIT(31)
#define  TDMOUT_CTRL0_RST_OUT		BIT(29)
#define  TDMOUT_CTRL0_RST_IN		BIT(28)
#define TDMOUT_CTRL1			0x04
#define  TDMOUT_CTRL1_TYPE_MASK		GENMASK(6, 4)
#define  TDMOUT_CTRL1_TYPE(x)		((x) << 4)
#define  TDMOUT_CTRL1_MSB_POS_MASK	GENMASK(12, 8)
#define  TDMOUT_CTRL1_MSB_POS(x)	((x) << 8)
#define  TDMOUT_CTRL1_SEL_SHIFT		24
#define  TDMOUT_CTRL1_GAIN_EN		26
#define  TDMOUT_CTRL1_WS_INV		BIT(28)
#define TDMOUT_SWAP			0x08
#define TDMOUT_MASK0			0x0c
#define TDMOUT_MASK1			0x10
#define TDMOUT_MASK2			0x14
#define TDMOUT_MASK3			0x18
#define TDMOUT_STAT			0x1c
#define TDMOUT_GAIN0			0x20
#define TDMOUT_GAIN1			0x24
#define TDMOUT_MUTE_VAL			0x28
#define TDMOUT_MUTE0			0x2c
#define TDMOUT_MUTE1			0x30
#define TDMOUT_MUTE2			0x34
#define TDMOUT_MUTE3			0x38
#define TDMOUT_MASK_VAL			0x3c

static const struct regmap_config axg_tdmout_regmap_cfg = {
	.reg_bits	= 32,
	.val_bits	= 32,
	.reg_stride	= 4,
	.max_register	= TDMOUT_MASK_VAL,
};

static const struct snd_kcontrol_new axg_tdmout_controls[] = {
	SOC_DOUBLE("Lane 0 Volume", TDMOUT_GAIN0,  0,  8, 255, 0),
	SOC_DOUBLE("Lane 1 Volume", TDMOUT_GAIN0, 16, 24, 255, 0),
	SOC_DOUBLE("Lane 2 Volume", TDMOUT_GAIN1,  0,  8, 255, 0),
	SOC_DOUBLE("Lane 3 Volume", TDMOUT_GAIN1, 16, 24, 255, 0),
	SOC_SINGLE("Gain Enable Switch", TDMOUT_CTRL1,
		   TDMOUT_CTRL1_GAIN_EN, 1, 0),
};

static const char * const tdmout_sel_texts[] = {
	"IN 0", "IN 1", "IN 2",
};

static SOC_ENUM_SINGLE_DECL(axg_tdmout_sel_enum, TDMOUT_CTRL1,
			    TDMOUT_CTRL1_SEL_SHIFT, tdmout_sel_texts);

static const struct snd_kcontrol_new axg_tdmout_in_mux =
	SOC_DAPM_ENUM("Input Source", axg_tdmout_sel_enum);

static struct snd_soc_dai *
axg_tdmout_get_be(struct snd_soc_dapm_widget *w)
{
	struct snd_soc_dapm_path *p = NULL;
	struct snd_soc_dai *be;

	snd_soc_dapm_widget_for_each_sink_path(w, p) {
		if (!p->connect)
			continue;

		if (p->sink->id == snd_soc_dapm_dai_in)
			return (struct snd_soc_dai *)p->sink->priv;

		be = axg_tdmout_get_be(p->sink);
		if (be)
			return be;
	}

	return NULL;
}

static struct axg_tdm_stream *
axg_tdmout_get_tdm_stream(struct snd_soc_dapm_widget *w)
{
	struct snd_soc_dai *be = axg_tdmout_get_be(w);

	if (!be)
		return NULL;

	return be->playback_dma_data;
}

static void axg_tdmout_enable(struct regmap *map)
{
	/* Apply both reset */
	regmap_update_bits(map, TDMOUT_CTRL0,
			   TDMOUT_CTRL0_RST_OUT | TDMOUT_CTRL0_RST_IN, 0);

	/* Clear out reset before in reset */
	regmap_update_bits(map, TDMOUT_CTRL0,
			   TDMOUT_CTRL0_RST_OUT, TDMOUT_CTRL0_RST_OUT);
	regmap_update_bits(map, TDMOUT_CTRL0,
			   TDMOUT_CTRL0_RST_IN,  TDMOUT_CTRL0_RST_IN);

	/* Actually enable tdmout */
	regmap_update_bits(map, TDMOUT_CTRL0,
			   TDMOUT_CTRL0_ENABLE, TDMOUT_CTRL0_ENABLE);
}

static void axg_tdmout_disable(struct regmap *map)
{
	regmap_update_bits(map, TDMOUT_CTRL0, TDMOUT_CTRL0_ENABLE, 0);
}

static int axg_tdmout_prepare(struct regmap *map, struct axg_tdm_stream *ts)
{
	unsigned int val = 0;

	/* Set the stream skew */
	switch (ts->iface->fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
	case SND_SOC_DAIFMT_DSP_A:
		val |= TDMOUT_CTRL0_INIT_BITNUM(1);
		break;

	case SND_SOC_DAIFMT_LEFT_J:
	case SND_SOC_DAIFMT_RIGHT_J:
	case SND_SOC_DAIFMT_DSP_B:
		val |= TDMOUT_CTRL0_INIT_BITNUM(2);
		break;

	default:
		pr_err("Unsupported format: %u\n",
		       ts->iface->fmt & SND_SOC_DAIFMT_FORMAT_MASK);
		return -EINVAL;
	}

	/* Set the slot width */
	val |= TDMOUT_CTRL0_BITNUM(ts->iface->slot_width - 1);

	/* Set the slot number */
	val |= TDMOUT_CTRL0_SLOTNUM(ts->iface->slots - 1);

	regmap_update_bits(map, TDMOUT_CTRL0,
			   TDMOUT_CTRL0_INIT_BITNUM_MASK |
			   TDMOUT_CTRL0_BITNUM_MASK |
			   TDMOUT_CTRL0_SLOTNUM_MASK, val);

	/* Set the sample width */
	val = TDMOUT_CTRL1_MSB_POS(ts->width - 1);

	/* FIFO data are arranged in chunks of 64bits */
	switch (ts->physical_width) {
	case 8:
		/* 8 samples of 8 bits */
		val |= TDMOUT_CTRL1_TYPE(0);
		break;
	case 16:
		/* 4 samples of 16 bits - right justified */
		val |= TDMOUT_CTRL1_TYPE(2);
		break;
	case 32:
		/* 2 samples of 32 bits - right justified */
		val |= TDMOUT_CTRL1_TYPE(4);
		break;
	default:
		pr_err("Unsupported physical width: %u\n",
		       ts->physical_width);
		return -EINVAL;
	}

	/* If the sample clock is inverted, invert it back for the formatter */
	if (axg_tdm_lrclk_invert(ts->iface->fmt))
		val |= TDMOUT_CTRL1_WS_INV;

	regmap_update_bits(map, TDMOUT_CTRL1,
			   (TDMOUT_CTRL1_TYPE_MASK | TDMOUT_CTRL1_MSB_POS_MASK |
			    TDMOUT_CTRL1_WS_INV), val);

	/* Set static swap mask configuration */
	regmap_write(map, TDMOUT_SWAP, 0x76543210);

	return axg_tdm_formatter_set_channel_masks(map, ts, TDMOUT_MASK0);
}

static const struct snd_soc_dapm_widget axg_tdmout_dapm_widgets[] = {
	SND_SOC_DAPM_AIF_IN("IN 0", NULL, 0, SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_AIF_IN("IN 1", NULL, 0, SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_AIF_IN("IN 2", NULL, 0, SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_MUX("SRC SEL", SND_SOC_NOPM, 0, 0, &axg_tdmout_in_mux),
	SND_SOC_DAPM_PGA_E("ENC", SND_SOC_NOPM, 0, 0, NULL, 0,
			   axg_tdm_formatter_event,
			   (SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_PRE_PMD)),
	SND_SOC_DAPM_AIF_OUT("OUT", NULL, 0, SND_SOC_NOPM, 0, 0),
};

static const struct snd_soc_dapm_route axg_tdmout_dapm_routes[] = {
	{ "SRC SEL", "IN 0", "IN 0" },
	{ "SRC SEL", "IN 1", "IN 1" },
	{ "SRC SEL", "IN 2", "IN 2" },
	{ "ENC", NULL, "SRC SEL" },
	{ "OUT", NULL, "ENC" },
};

static const struct snd_soc_component_driver axg_tdmout_component_drv = {
	.controls		= axg_tdmout_controls,
	.num_controls		= ARRAY_SIZE(axg_tdmout_controls),
	.dapm_widgets		= axg_tdmout_dapm_widgets,
	.num_dapm_widgets	= ARRAY_SIZE(axg_tdmout_dapm_widgets),
	.dapm_routes		= axg_tdmout_dapm_routes,
	.num_dapm_routes	= ARRAY_SIZE(axg_tdmout_dapm_routes),
};

static const struct axg_tdm_formatter_ops axg_tdmout_ops = {
	.get_stream	= axg_tdmout_get_tdm_stream,
	.prepare	= axg_tdmout_prepare,
	.enable		= axg_tdmout_enable,
	.disable	= axg_tdmout_disable,
};

static const struct axg_tdm_formatter_driver axg_tdmout_drv = {
	.component_drv	= &axg_tdmout_component_drv,
	.regmap_cfg	= &axg_tdmout_regmap_cfg,
	.ops		= &axg_tdmout_ops,
	.invert_sclk	= true,
};

static const struct of_device_id axg_tdmout_of_match[] = {
	{
		.compatible = "amlogic,axg-tdmout",
		.data = &axg_tdmout_drv,
	}, {}
};
MODULE_DEVICE_TABLE(of, axg_tdmout_of_match);

static struct platform_driver axg_tdmout_pdrv = {
	.probe = axg_tdm_formatter_probe,
	.driver = {
		.name = "axg-tdmout",
		.of_match_table = axg_tdmout_of_match,
	},
};
module_platform_driver(axg_tdmout_pdrv);

MODULE_DESCRIPTION("Amlogic AXG TDM output formatter driver");
MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
MODULE_LICENSE("GPL v2");