linux/sound/soc/meson/axg-toddr.c

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

/* This driver implements the frontend capture DAI of AXG based SoCs */

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

#include "axg-fifo.h"

#define CTRL0_TODDR_SEL_RESAMPLE	BIT(30)
#define CTRL0_TODDR_EXT_SIGNED		BIT(29)
#define CTRL0_TODDR_PP_MODE		BIT(28)
#define CTRL0_TODDR_TYPE_MASK		GENMASK(15, 13)
#define CTRL0_TODDR_TYPE(x)		((x) << 13)
#define CTRL0_TODDR_MSB_POS_MASK	GENMASK(12, 8)
#define CTRL0_TODDR_MSB_POS(x)		((x) << 8)
#define CTRL0_TODDR_LSB_POS_MASK	GENMASK(7, 3)
#define CTRL0_TODDR_LSB_POS(x)		((x) << 3)

static int axg_toddr_pcm_new(struct snd_soc_pcm_runtime *rtd,
			     struct snd_soc_dai *dai)
{
	return axg_fifo_pcm_new(rtd, SNDRV_PCM_STREAM_CAPTURE);
}

static int axg_toddr_dai_hw_params(struct snd_pcm_substream *substream,
				   struct snd_pcm_hw_params *params,
				   struct snd_soc_dai *dai)
{
	struct axg_fifo *fifo = snd_soc_dai_get_drvdata(dai);
	unsigned int type, width, msb = 31;

	/*
	 * NOTE:
	 * Almost all backend will place the MSB at bit 31, except SPDIF Input
	 * which will put it at index 28. When adding support for the SPDIF
	 * Input, we'll need to find which type of backend we are connected to.
	 */

	switch (params_physical_width(params)) {
	case 8:
		type = 0; /* 8 samples of 8 bits */
		break;
	case 16:
		type = 2; /* 4 samples of 16 bits - right justified */
		break;
	case 32:
		type = 4; /* 2 samples of 32 bits - right justified */
		break;
	default:
		return -EINVAL;
	}

	width = params_width(params);

	regmap_update_bits(fifo->map, FIFO_CTRL0,
			   CTRL0_TODDR_TYPE_MASK |
			   CTRL0_TODDR_MSB_POS_MASK |
			   CTRL0_TODDR_LSB_POS_MASK,
			   CTRL0_TODDR_TYPE(type) |
			   CTRL0_TODDR_MSB_POS(msb) |
			   CTRL0_TODDR_LSB_POS(msb - (width - 1)));

	return 0;
}

static int axg_toddr_dai_startup(struct snd_pcm_substream *substream,
				 struct snd_soc_dai *dai)
{
	struct axg_fifo *fifo = snd_soc_dai_get_drvdata(dai);
	unsigned int fifo_threshold;
	int ret;

	/* Enable pclk to access registers and clock the fifo ip */
	ret = clk_prepare_enable(fifo->pclk);
	if (ret)
		return ret;

	/* Select orginal data - resampling not supported ATM */
	regmap_update_bits(fifo->map, FIFO_CTRL0, CTRL0_TODDR_SEL_RESAMPLE, 0);

	/* Only signed format are supported ATM */
	regmap_update_bits(fifo->map, FIFO_CTRL0, CTRL0_TODDR_EXT_SIGNED,
			   CTRL0_TODDR_EXT_SIGNED);

	/* Apply single buffer mode to the interface */
	regmap_update_bits(fifo->map, FIFO_CTRL0, CTRL0_TODDR_PP_MODE, 0);

	/* TODDR does not have a configurable fifo depth */
	fifo_threshold = AXG_FIFO_MIN_CNT - 1;
	regmap_update_bits(fifo->map, FIFO_CTRL1, CTRL1_THRESHOLD_MASK,
			   CTRL1_THRESHOLD(fifo_threshold));

	return 0;
}

static void axg_toddr_dai_shutdown(struct snd_pcm_substream *substream,
				   struct snd_soc_dai *dai)
{
	struct axg_fifo *fifo = snd_soc_dai_get_drvdata(dai);

	clk_disable_unprepare(fifo->pclk);
}

static const struct snd_soc_dai_ops axg_toddr_ops = {
	.hw_params	= axg_toddr_dai_hw_params,
	.startup	= axg_toddr_dai_startup,
	.shutdown	= axg_toddr_dai_shutdown,
};

static struct snd_soc_dai_driver axg_toddr_dai_drv = {
	.name = "TODDR",
	.capture = {
		.stream_name	= "Capture",
		.channels_min	= 1,
		.channels_max	= AXG_FIFO_CH_MAX,
		.rates		= AXG_FIFO_RATES,
		.formats	= AXG_FIFO_FORMATS,
	},
	.ops		= &axg_toddr_ops,
	.pcm_new	= axg_toddr_pcm_new,
};

static const char * const axg_toddr_sel_texts[] = {
	"IN 0", "IN 1", "IN 2", "IN 3", "IN 4", "IN 6"
};

static const unsigned int axg_toddr_sel_values[] = {
	0, 1, 2, 3, 4, 6
};

static SOC_VALUE_ENUM_SINGLE_DECL(axg_toddr_sel_enum, FIFO_CTRL0,
				  CTRL0_SEL_SHIFT, CTRL0_SEL_MASK,
				  axg_toddr_sel_texts, axg_toddr_sel_values);

static const struct snd_kcontrol_new axg_toddr_in_mux =
	SOC_DAPM_ENUM("Input Source", axg_toddr_sel_enum);

static const struct snd_soc_dapm_widget axg_toddr_dapm_widgets[] = {
	SND_SOC_DAPM_MUX("SRC SEL", SND_SOC_NOPM, 0, 0, &axg_toddr_in_mux),
	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_AIF_IN("IN 3", NULL, 0, SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_AIF_IN("IN 4", NULL, 0, SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_AIF_IN("IN 6", NULL, 0, SND_SOC_NOPM, 0, 0),
};

static const struct snd_soc_dapm_route axg_toddr_dapm_routes[] = {
	{ "Capture", NULL, "SRC SEL" },
	{ "SRC SEL", "IN 0", "IN 0" },
	{ "SRC SEL", "IN 1", "IN 1" },
	{ "SRC SEL", "IN 2", "IN 2" },
	{ "SRC SEL", "IN 3", "IN 3" },
	{ "SRC SEL", "IN 4", "IN 4" },
	{ "SRC SEL", "IN 6", "IN 6" },
};

static const struct snd_soc_component_driver axg_toddr_component_drv = {
	.dapm_widgets		= axg_toddr_dapm_widgets,
	.num_dapm_widgets	= ARRAY_SIZE(axg_toddr_dapm_widgets),
	.dapm_routes		= axg_toddr_dapm_routes,
	.num_dapm_routes	= ARRAY_SIZE(axg_toddr_dapm_routes),
	.ops			= &axg_fifo_pcm_ops
};

static const struct axg_fifo_match_data axg_toddr_match_data = {
	.component_drv	= &axg_toddr_component_drv,
	.dai_drv	= &axg_toddr_dai_drv
};

static const struct of_device_id axg_toddr_of_match[] = {
	{
		.compatible = "amlogic,axg-toddr",
		.data = &axg_toddr_match_data,
	}, {}
};
MODULE_DEVICE_TABLE(of, axg_toddr_of_match);

static struct platform_driver axg_toddr_pdrv = {
	.probe = axg_fifo_probe,
	.driver = {
		.name = "axg-toddr",
		.of_match_table = axg_toddr_of_match,
	},
};
module_platform_driver(axg_toddr_pdrv);

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